“COVER PAGE”
PROJECT TITLE A PROJECT REPORT Submitted to SUNRISE UNIVERSITY in partial fulfilment for the award of the diploma of
POLYTECHNIC In MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
SUNRISE UNIVERSITY ALWAR RAJASTHAN, INDIA
MAY 2014 “Annexure1”
PROJECT TITLE <1.5 line spacing> 1
A PROJECT REPORT
Submitted to SUNRISE UNIVERSITY
in partial fulfilment for the award of the diploma of <1.5 line spacing>
POLYTECHNIC
IN MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
SUNRISE UNIVERSITY
ALWAR RAJASTHAN, INDIA
MAY 2014
2
CERTIFICATE
This is to certify that the project report entitled “TITLE OF PROJECT WORK
”
submitted by NAME OF GROUP to the SunRise University Alwar,Rajasthan in partial fulfilment for the award of Diploma of Polytechnic in Mechanical Engineering is a confide record of the project work carried out by him under my supervision during the year 20152016.
Submitted to:
Submitted by:
Name of incharge
Name of student(Roll)
Designation
Name (Project Guide) Designation
SUNRISE UNIVERSITY Bagad Rajput, ALWAR-301030(Raj.) INDIA 3
ACKNOWLEDGEMENT
I take this opportunity to express my profound gratitude and deep to my mentor Mr. Vinayak Hemadri for his exemplary guidance, monitoring and constant encouragement throughout the course of this thesis. The blessing, help and guidance given by him time to time shall carry me a long way on the journey of life in which I am about to embark. I also take this opportunity to express a deep sense of gratitude to the mentor for his cordial support, valuable information and guidance, which helped me in completing this task through various stages. Lastly, I thank almighty, my parents, and friends for their constant encouragement without which this assignment would not be completed.
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ABSTRACT
A fluid power system is defined as a means of power transmission in which a relatively incompressible fluid is used as the power transmitting media
The primary purpose of fluid power system is the transfer of energy from one location to another and this energy into useful work. By this hydraulic jack is used to lift the fork. In industries this kind of fork lift can be used in order to decrease the human effort. This type of fork lift need less maintenance and logs days of operational quality.
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TABLE OF CONTENTS
CHAPTER NO
TITLE
PAGE NO
ABSTRACT
5
LIST OF FIGURES
6
LIST OF TABLES
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1. INTRODUCTION 1.1 PRINCIPLES OF HYDRAULIC JACK
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1.2 PASCAL’S LAW
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1.3 ADVANTAGES
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1.4 DISADVANTAGES
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CHAPTER 2 2.1 BLOCK DIAGRAM
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2.2 FORKLIFT
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2.3 WHY USE FORKLIFT?
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2.4 COMPONENTS
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2.5 HYDRAULIC CYLINDER
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2.6 HYDRAULIC FLUID
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2.7 ARM
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2.8 HYDRAULIC FLUID
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2.9 BRAKE FLUID
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2.10 TYPES OF LUBRICANTS
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CHAPTER 3 3.1 WHY PREFER HYDRAULCS OVER PNEUMATICS
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3.2 WORKING PRINCIPLE
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3.3 MAINTENANCE AND STORAGE
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3.3.1 LUBRICATING
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3.4 MAINTAINING OIL LEVEL
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3.4.1 IMPORTANT NOTE
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3.4.2 ADDING OIL
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3.4.3 REPLACING OIL
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3.4.4 CLEANING
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3.4.5 STORAGE
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3.4.6 REPAIRING JACK
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CHAPTER 4 4.1 PROPOSED MODEL - HYDRAULIC FORK WITH JACK OF LIFITING CAPACITY 2 TONNES
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4.2 PROPOSED MODEL - HYDRAULIC FORK CRANK ROD FOR LIFITING AND PRESSURE PRODUCER
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4.3 HARDWARE USED IN PROJECT
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4.4 TOOLS USED IN PROJECT
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CHAPTER 5 5.1 CONCLUSION
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REFERENCES
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LIST OF FIGURES
FIGURE.NO
NAME
PAGE.NO
1.1
Pascal’s Demonstration Setup
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2.1
Hydraulic Fork Lift
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2.4
Working Of Hydraulic Fork Lift
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2.8
Sketch Of Reservoir
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3.3.2
Sketch Of Ram cylinder
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3.4.2
Working Of Hydraulic force with oil
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4.1
Proposed Model - Hydraulic Fork with Jack Of Lifting Capacity 2 Tonnes
4.2
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Proposed Model - Hydraulic Fork Crank Rod For Limiting And Pressure Producer
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CHAPTER 1 1.1 INTRODUCTION There are mainly two types of fluid power systems: Hydraulic Power System( employing liquids) Pneumatic Power System(employing air) 1.2 Pascal’s law Pascal’s law states that the pressure applied anywhere to a confined liquid is transmitted equally to every portion of the surface of the containing vessel. When a force is applied to the liquid by a piston, the liquid transmits this force equally to all surfaces of the container.
Fig 1.1: Pascal’s demonstration setup
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1.3 ADVANTAGES The process uses low- cost energy source Large machines frames are not required on the process No extra skill is required for operating this system Easier maintenance Less loss in power transmission
1.4 DISADVANTAGES Machining work is very complicated Very sturdy base needed Hydraulics components cost is high The forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
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A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
Every day, a brief inspection should be carried out. Tire pressure, for instance, is extremely important, because low pressure in a tire or tires can allow the forklift to tilt beyond its design capabilities and tip over. Are there cracks, deformations or other signs of weakness in the forks, masts, overhead guard or seat backrest? If so, find the proper forklift attachment and replace the defective part.
The lights, horn and any other warning devices should be checked daily, as well. If the forklift is not fitted with a reverse beeper, this is one forklift attachment that should seriously be considered. Accidents happen frequently when forklifts are travelling in reverse, when the operator has poor visibility.
These are just a few of the safety precautions that every forklift operator should take. Thorough training and a complete understanding of forklift operation and safety, combined with safety forklift attachments can and do save lives. Hydraulic jack works on the principle of ―Pascal‘s law‖. When the handle is operated, the plunger reciprocates then the oil from the reservoir is sucked into the plunger cylinder during upward stroke of the plunger through the suction valve. The oil in the plunger cylinder is delivered into the ram cylinder during the downward stroke of the plunger through the delivery valve. This pressurized oil lifts the load up, which is placed on top plate of the ram. After the work is completed the pressure in the ram cylinder is released by unscrewing the lowering screw thus the pressure releases and the
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ram is lowered, then the oil is rushed into the reservoir. It consists of plunger cylinder on one side and ram cylinder on the other side. These two cylinders are mounted on base which is made of mild steel. Plunger cylinder consists of plunger which is used to build up the pressure by operating the handle. Plunger cylinder consists of two non-return valves i.e. one for suction and other for delivery. Ram cylinder consists of ram which lifts the load. The ram cylinder connected to delivery valve of plunger cylinder. It is also consists of lowering screw this is nothing but a hand operated valve used for releasing the pressure in the ram cylinder for get down the load. the fuel consumption reduction effect at in-house measurement courses. The fuel reduction effect was obtained in any course. In particular, the effect of no less than 29% was obtained at a high load course where there is a lot of switch back in a short distance assuming loading work to a truck. shows the frequency distribution of engine speed and torque at the high load course This shows that as a circle is larger, the frequency is higher. It can be seen that large circles move to the small fuel consumption side as compared with those for the conventional forklift. In particular, HST forklift used the range where there was little change in engine speed during acceleration and fuel consumption was small for a long time. Therefore, the result as intended was obtained. In cooperation with Power Train Development Centre and Hydraulic Equipment Technical Centre, we have realized commercialization of forklifts installed with electronically controlled HST and CLSS hydraulic system for the first time as Komatsu. We will continue to make efforts to expand the model line-up installed with HST and CLSS in the future and at the same time to aim at further technological leaps to develop these models to be more attractive to customers. 12
CHAPTER 2 2.1 BLOCK DIAGRAM
Fig 2.1.1: Hydraulic fork lift
For more than 150 years since the birth of the modern elevator, lifts have formed an important part of our life. While lifts are widely used for transporting men to higher floors, and in multi-storeyed buildings all over the world, there is also a completely different use for lifts, as far as work and industries are concerned.
At such places, lifts are increasingly required to raise heavy loads in the form of machinery, and equipment at different levels. Due to the heavy weight to be lifted, the standard roped elevator design is not very efficient for the purpose.
The forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident
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highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
A hydraulic lift typically uses hydraulic cylinders to either raise or lower platforms for work, or other lifting devices. Hydraulic lifts are ideally used for support, as well as lift and move heavy to very heavy, and large objects; at the same time providing a safe environment that is ergonomically useful. While hydraulic lifts are mainly used for loading, and positioning work objects, at times this can also used for transporting personnel, if required. The kind of hydraulic lift to be used in a particular situation will depend upon the style of the platform, and its mounting style, as well as the material that it uses. Commonly used types of hydraulic lifts are table lifts, dock lifts, forklifts, pallet lifts etc.
2.2 FORKLIFT
A forklift truck (also called a lift truck, a fork truck, a forklift, or a tow-motor) is a powered industrial truck used to lift and transport materials
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Forklift attachments are used to increase the number of functions performed by a forklift. Forklifts are basically designed to lift rectangular loads and carry them from one place to another. With the help of attachments, it can perform a number of varied tasks.
A forklift consists of a fork shaped lifting mechanism that is powered using a hydraulic system. All the attachments are designed to fit in the forks or projecting platform of the forklift. Some attachments are also connected to the hydraulic system of the forklift. A range of attachments like waste handling, sweeping machines, drum handling equipment, snow ploughs, salt spreaders and others are in use today.
These attachments make the forklifts more versatile, and save considerable costs for a company or warehouse that uses it. Safety attachments like fork fenders can be used to warn people of moving forklifts. Companies also design customized attachments based on the exclusive needs of the customer.
The forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
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A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
New attachments are constantly being designed so that forklifts can enter new work areas and improve cost effectiveness. However, some of these attachments create handling problems, as they are heavy and do not have lifting handles. Attaching and removing these can take a lot of time and effort. Apart from these, other attachments certainly add value to a forklifts performance. The kind of hydraulic lift to be used in a particular situation will depend upon the style of the platform, and its mounting style, as well as the material that it uses. Commonly used types of hydraulic lifts are table lifts, dock lifts, forklifts, pallet lifts etc.
2.3 WHY USE FORKLIFT?
To reduce the human effort To make the work easy and simple To reduce the time taken
2.4 COMPONENTS HYDRAULIC CYLINDER PUMP STRUCTURE ARM
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WHEELS HYDRAULIC FLUID
Fig 2.4 Working Of Hydraulic Fork Lift 2.5 HYDRAULIC CYLINDER They convert the pressure energy of fluid into mechanical output to perform useful work The fluid power is converted into straight line reciprocating motion 2.6 ARM It is made by joining pieces of steel and made into a frame The arm is used to load the objects on it 17
2.6 HYDRAULIC FLUID Hydraulic fluids, also called hydraulic liquids, are the medium by which power is transferred in hydraulic machinery Common hydraulic fluids are based on mineral oil or water The primary function of a hydraulic fluid is to convey power In use, however, there are other important functions of hydraulic fluid such as protection of the hydraulic machine components 2.7 ARM It is made by joining pieces of steel and made into a frame The arm is used to load the objects on it 2.8 HYDRAULIC FLUID •
Hydraulic fluids, also called hydraulic liquids, are the medium by which power is transferred in hydraulic machinery
•
Common hydraulic fluids are based on mineral oil or water
•
The primary function of a hydraulic fluid is to convey power
•
In use, however, there are other important functions of hydraulic fluid such as protection of the hydraulic machine components
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Fig 2.8 Sketch Of Reservoir
2.9 BRAKE FLUID Brake fluid is a subtype of hydraulic fluid with high boiling point, both when new (specified by the equilibrium boiling point) and after absorption of water vapour (specified by wet boiling point). Under the heat of braking, both free water and water vapour in a braking system can boil into a compressible vapour, resulting in brake failure. Glycol-ether based fluids are hygroscopic, and absorbed moisture will greatly reduce the boiling point over time. Mineral oil and silicone based fluids are not hygroscopic. Because industrial hydraulic systems operate at hundreds to thousands of PSI and temperatures reaching hundreds of degrees Celsius, severe injuries and death can result from component failures and care must always be taken when performing maintenance on hydraulic systems. The forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver 19
instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
Forklifts and pallet lifts are used to lift the load from the base or pallets. Forklift trucks are a common sight at docks, as well as warehouses, and storage places. These trucks are mobile forklifts that are used to lift and transport goods at short distances. Fork lifts, and pallet lifts are used for loading, unloading, as well as storage and working purposes. Tilt table are hollow bins with four sides, and (usually) open at the top. These cannot only raise or lower the work piece, but can also tilt it an angle to place it in an ergonomically optimal position to be worked upon.
The main reason for the widespread use of the hydraulic lifts is the benefits it provides by creating ergonomically safe working conditions. This helps to greatly reduce, or even eliminate the large amount of injuries caused to workers due to repetitive stress.
Such injuries frequently occur when the job is much more physically demanding as compared to the physical limitations of the workers. Hydraulic lifts help to place the work
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material at positions that is not awkward to the workers, in an easy, and safe manner. The worker may not only benefit from the better posture for work, but the lifts can also help in placing the objects in such a manner that the worker would require the minimum force, and labor to get the job done. Due to creation of such work friendly environment, it not only results in reduced injuries, but also better productivity on the part of the workers.
By using hydraulic lifts, this can be successfully achieved in a variety of conditions that are otherwise very demanding or dangerous. Hydraulic lifts can also be used to move materials horizontally, as well as vertically. Many hydraulic lifts come with wheel, and are thus mobile in nature, and thus can be used in various situations (the best example being the forklift truck). For sustained use in a repetitive work environment, hydraulic lifts can be permanently fixed, and be made a part of the process line. In a manufacturing workshop, smaller hydraulic lifts are commonly used for holding and moving various products.
2.10 Types of Lubricants The requirements that lubricants need to satisfy generally consist of the following. (1) High oil film strength (2) Low friction (3) High wear resistance (4) High thermal stability (5) Non-corrosive (6) Highly anti-corrosive (7) Minimal dust/water content (8) Consistency of grease must not be altered to a significant extent even after it is repeatedly stirred.
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Forklift trucks are a very important equipment that are needed on a daily basis. They are necessary because they speed up the production process by loading and offloading the raw material and finished product to and from the warehouse or factory. These equipments are highly useful as they have a huge loading capacity that ranges from one to five tons. To lift very heavy loads, those with a capacity of up to 50 tons are used. People can buy the various forklift parts online.
These machines help in timely delivering of the products to the clients. If this machinery is not working properly you immediately need to buy forklift truck parts. If you don’t have the budget to buy new ones, you can buy used forklift parts that are maintained in good condition and have the capacity to work in an efficient way. There are several companies that sell forklift parts online, but you need to choose one that satisfy your requirements. You need to research online and narrow down your search to a few selected companies which provide quality forklift spare parts. You can also check their testimonials and be assured of the quality of the products and services they provide.
Background check for the company you have chosen and know the services they provide along with the products. You should ask them beforehand whether they get the part fixed themselves or not. Also, see whether they provide warranty for the replacement parts as you’ll not want unnecessary expenses to be made on replacing them. You can get the assistance of technicians who can suggest the right forklift part for your truck and thus save time and energy.
So, whether you want a mast, load back rest, overhead Guard, cab, counter weight, tilt cylinders, side shifter, wheels, rotator, mast rollers, pole attachments, man basket, starters etc, you can order them online. With all the information gathered of a reputed company providing
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forklift parts you can order for the needed forklift truck parts easily online. You can get them at Low price side shifters and therefore you can reduce your the cost of the production process.
The forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
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CHAPTER 3 3.1 WHY PREFER HYDRAULCS OVER PNEUMATICS?
The force required to accelerate oil is many times greater than that required to accelerate an equal volume of air Liquids also exhibit greater viscosity than gases. This results in larger frictional pressure Due to compressibility of air, it is impossible to obtain a precise control of actuator velocities in pneumatic systems
Table 3.1.1 Materilas used in this setup
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1) Reduction in fuel consumption Reduction in power transmission loss thanks to the electronically-controlled HST Realization of low fuel consumption in high load work by controlling engine output in accordance with cargo weight Reduction in oil pressure loss during simultaneous operation of load handling system and travel drive system thanks to CLSS + variable pump (2) Improvement in operability and workability Travel operation has become easier than that of T/C forklifts due to the adoption of electronically-controlled HST. Improvement in workability during stopping, hill starting and switch-back operation (3) Improvement in safety Travel speed limiting function as standard equipment The clutch is attached to the output shaft of the transmission and when the inching pedal is depressed, power is shut off. If you want to travel forward slowly while operating the load handling system fast (simultaneous operation of load handling and travel), depress the accelerator pedal to increase engine speed and adjust clutch slip with the inching pedal to control the travel speed. The engine rotates the pump to produce oil pressure, which is converted again to turning force with the motor. A flow rate of hydraulic oil is continuously increased or decreased by changing the angle of the swash plate connected to the pistons to change the piston stroke. This swash plate angle control realizes the stepless speed control from forward travel, stop to reversing. When the swash plate is moved to the neutral position, the piston stroke stops, producing the same effect as the application of the brake. When the inching pedal is depressed, the HST pump swash plate moves to the neutral position and the machine stops. During simultaneous operation of load handling and travel, depress the accelerator pedal to increase engine speed, change a HST pump capacity control signal from the controller with the inching pedal and adjust the swash plate angle (oil quantity) to control the travel speed. A 25
variable pump is used also for the hydraulic system of load handling system and supplies only a necessary quantity of oil with a signal from the operating valve. Forklifts are often operated in a limited place, and acceleration and stop (with change in travel direction, forward and backward), and simultaneous operation of load handling and travel are frequently performed. This type of usage is more remarkable in a worksite with higher load and higher rate of operation. As such condition also makes the fuel consumption larger, users have a keen interest in fuel consumption reduction. In consideration of such worksites where fuel consumption reduction has a large merit to customers, the following fuel consumption reduction technologies have been incorporated. Reduction in heating loss and slip loss by HST In simultaneous operation of load handling and travel of a T/C forklift, clutch slip loss and heating loss are produced because speed control is performed by controlling the clutch slip with the inching pedal. On the other hand, on a HST forklift, the travel speed is controlled by changing the pump swash plate angle to reduce the oil flow rate instead of slipping the clutch. Therefore, heating loss and slip loss are not produced, resulting in fuel consumption reduction. High efficiency in low travel speed zone In a torque converter (3 elements, 1 stage, dual phase type) used generally for forklifts, efficiency in the high travel speed zone is high due to a free wheel, but efficiency is worse than that of HST in the low travel speed zone due to large churning loss. Therefore, on a HST forklift, control is performed to suppress the rev-up of engine while improving the acceleration performance, reducing fuel consumption during acceleration without changing travelling performance.
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3.2 WORKING PRINCIPLE The hydraulic cylinder consists of a hollow tube sealed at one end with a movable, lubricated piston fitting into the other The hydraulic fluid is present inside the cylinder which acts as the force medium for this operation It enters the bottom of the cylinder through a special "one way" valve that allows fluid to enter without leaking back out.
Fig 3.2 Sketch Of Ram Cylinder
3.3 MAINTENANCE AND STORAGE 3.3.1 Lubricating All moving parts on jack should be lubricated every month with a general purpose grease to maintain efficient operation. Apply grease to joints on lift arm hinges, push rods; 27
handle base, rear caster wheels, front roller, etc. Lifting arm pivot point #37 needs to be well lubricated or jack may make creaking sounds under heavy loads. When using an LM system, it is necessary to provide effective lubrication. Without lubrication, the rolling elements or the raceway may be worn faster and the service life may be shortened. A lubricant has effects such as the following. (1) Minimizes friction in moving elements to prevent seizure and reduce wear. (2) Forms an oil film on the raceway to decrease stress acting on the surface and extend rolling fatigue life. (3) Covers the metal surface to prevent rust formation. To fully bring out an LM system’s functions, it is necessary to provide lubrication according to the conditions. It is necessary to study the mounting positions of the grease nipple and piping joint according to the installation direction. If the mounting orientation of the LM Guide is other than horizontal installation, the lubricant may not reach the raceway completely. Be sure to let know the installation direction and the exact position in each LM block where the grease nipple or the piping joint should be attached. •
the amount of oil to be supplied varies with stroke length. For a long stroke, increase the lubrication frequency or the amount of oil so that an oil film reaches the stroke end of the raceway.
•
In environments where a liquid coolant is spattered, the lubricant will be mixed with the coolant, and this can result in the lubricant being emulsified or washed away, causing significantly degraded lubrication performance. In such settings, apply a lubricant with high viscosity kinematic viscosity: approx. 68 cst) and high 28
emulsification-resistant, and adjust the lubrication frequency or the amount of the feed lubricant. For machine tools and similar devices that are subject to heavy loads and require high rigidity and operate at high speed, it is advisable to apply oil lubrication. •
Make sure that lubrication oil normally discharge
Hydraulic Pressure •
Pressure transducer is mounted in lift truck hydraulic circuit
•
Pressure transducer not exposed to shocks and vibration
•
Pressure transducer not affected by the environmental conditions
•
Hydraulic pressure transducer weighing system does not have moving parts
•
Hydraulic pressure transducer weighing system does not have cable installed along the vehicle mast
•
Hydraulic pressure transducer weighing system will not reduce lifting capacity of the vehicle
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Hydraulic pressure transducer weighing system will not reduce the visibility to the forks
•
Hydraulic pressure transducer weighing system can be installed and operated on vehicles regardless of the lifting capacity
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Hydraulic pressure transducer weighing system is robust and can operate in hazardous environments
•
Hydraulic pressure transducer weighing system can be easily moved from vehicle to vehicle
•
Hydraulic pressure transducer weighing system can be used in combination with any kind of accessories and attachment 29
Load Cell Weighing Systems •
Load cells are sensitive elements
•
Load cells assemblies must be protected from environmental influences
•
Any forklift collision or "bumping" into the external elements within the operational facility will disturb the scale accuracy
•
In many cases any "bumping" will create weighing errors and is some cases damaging the scale
•
Carriage or forks mounted load cells systems are situated exactly where the lift truck is most sensible and receives most of the bumps and vibrations
•
The vehicle "bumps" is the reason why load cell based weighing systems suffers break downs, constant maintenance, frequent technical service due to the need for recalibration of the system and in many cases replacement of the load cells
•
The carriage plate load cell weighing systems will reduce the lifting capacity of the vehicle from 20 to 25%
•
The carriage plate load cell weighing systems will reduce the visibility to the forks and the load being handled
•
The load cell weighing systems can not be moved from vehicle to vehicle
•
Installation must be done by qualified staff
•
Load cell based weighing systems requires frequent maintenance
•
Initial cost for the system purchase is high
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3.4 Maintaining Oil Level 3.4.1 Important Note: When adding or replacing oil, always use SAE 10 Hydraulic Jack Oil. Avoid mixing types of oil. DO NOT use Brake Fluid, Alcohol, Glycerine, Detergent, Motor Oil or Dirty Oil, Improper fluid can cause serious internal damage to Jack.
3.4.2 Adding Oil: With head cap fully lowered & jack on level ground, remove Air Vent Valve. Oil level should be visible at the air vent valve hole approx 12 mm below valve hole, do not overfill. If low, add oil as needed then close air vent valve.
Fig 3.4.2 Working Of Hydraulic force with oil
3.4.3 Replacing Oil: For better performance & longevity, replace oil supply once a year. To drain oil, open Air Vent Valve and loosen the release Valve by turning handle counter clockwise. BE VERY 31
CAREFUL not to permit dirt or foreign matter to get into the system. Invert jack over suitable container and allow oil to drain. Close release valve by turning handle clockwise, fill with SAE 10 Hydraulic Jack Oil close Air Vent Valve wipe away any spilt fluid. Test jack before lifting a load. 3.4.4 Cleaning Jack should be wiped clean with soft cloth only. Do not use gasoline, kerosene, or other such solvents or any abrasive cleanser as cleaning agents and solvents will cause deterioration of the hydraulic seals. 3.4.5 Storage Before storage, twist handle 1-1/2 turns counter clockwise to release pressure in hydraulic cylinder. Leave handle in this position. Store jack on a level surface, in a clean environment preferably indoors, in a dry area to protect jack from moisture. 3.4.6 Repairing Jack There are no user serviceable parts except as outlined above. Only trained, licensed and certified repair personnel should attempt any repairs or replacing of parts. Any modifications to this jack, except those performed by the manufacturer, or their designee, will void all warranties both written and implied Hydraulic jack works on the principle of ―Pascal‘s law‖. When the handle is operated, the plunger reciprocates then the oil from the reservoir is sucked into the plunger cylinder during upward stroke of the plunger through the suction valve. The oil in the plunger
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cylinder is delivered into the ram cylinder during the downward stroke of the plunger through the delivery valve. This pressurized oil lifts the load up, which is placed on top plate of the ram. After the work is completed the pressure in the ram cylinder is released by unscrewing the lowering screw thus the pressure releases and the ram is lowered, then the oil is rushed into the reservoir. It consists of plunger cylinder on one side and ram cylinder on the other side. These two cylinders are mounted on base which is made of mild steel. Plunger cylinder consists of plunger which is used to build up the pressure by operating the handle. Plunger cylinder consists of two non-return valves i.e. one for suction and other for delivery. Ram cylinder consists of ram which lifts the load. The ram cylinder connected to delivery valve of plunger cylinder. It is also consists of lowering screw this is nothing but a hand operated valve used for releasing the pressure in the ram cylinder for get down the load.
This pressurized oil lifts the load up, which is placed on top plate of the ram. After the work is completed the pressure in the ram cylinder is released by unscrewing the lowering screw thus the pressure releases and the ram is lowered, then the oil is rushed into the reservoir. It consists of plunger cylinder on one side and ram cylinder on the other side. These two cylinders are mounted on base which is made of mild steel. Plunger cylinder consists of plunger which is used to build up the pressure by operating the handle. Plunger cylinder consists of two non-return valves i.e. one for suction and other for delivery.
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Because forklift is a slow moving vehicles, the same risk it poses, such as a car or truck. However, due to the nature of its work, the other, equally dangerous. Each security forklift accessories serve a purpose, so they should not be taken lightly
It wasn’t until the 1990s that seatbelts became mandatory on forklifts. Unfortunately, the forklift one man was driving in 1996 was not fitted with a seatbelt forklift attachment. When the forklift began to tip over due to a faulty rear axle and a fault in the steering mechanism, the driver instinctively attempted to jump out of the cab to safety. Instead, he was pinned beneath the forklift’s overhead guard and died. This tragic accident highlights the vital importance of safety attachments on forklifts. In this case, several things could have prevented the accident.
Had the older model forklift been retro-fitted with a seatbelt forklift attachment, the man would not have been able to attempt to jump out of the cab. He would have been held securely within the protective confines of the steel structure that supported the overhead guard. He would have probably been injured anyway, but he most likely would not have died.
A forklift mechanical attachment like a seatbelt or a replacement part like an axle or portion of a steering mechanism is not an expensive purchase. The lesson from this example (and there have been many other similar accidents since) is that forklift safety is important.
Every day, a brief inspection should be carried out. Tire pressure, for instance, is extremely important, because low pressure in a tire or tires can allow the forklift to tilt beyond its design capabilities and tip over. Are there cracks, deformations or other signs of weakness in the forks, masts, overhead guard or seat backrest? If so, find the proper forklift attachment and replace the defective part.
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The lights, horn and any other warning devices should be checked daily, as well. If the forklift is not fitted with a reverse beeper, this is one forklift attachment that should seriously be considered. Accidents happen frequently when forklifts are travelling in reverse, when the operator has poor visibility.
These are just a few of the safety precautions that every forklift operator should take. Thorough training and a complete understanding of forklift operation and safety, combined with safety forklift attachments can and do save lives. Hydraulic jack works on the principle of ―Pascal‘s law‖. When the handle is operated, the plunger reciprocates then the oil from the reservoir is sucked into the plunger cylinder during upward stroke of the plunger through the suction valve. The oil in the plunger cylinder is delivered into the ram cylinder during the downward stroke of the plunger through the delivery valve. This pressurized oil lifts the load up, which is placed on top plate of the ram. After the work is completed the pressure in the ram cylinder is released by unscrewing the lowering screw thus the pressure releases and the ram is lowered, then the oil is rushed into the reservoir. It consists of plunger cylinder on one side and ram cylinder on the other side. These two cylinders are mounted on base which is made of mild steel. Plunger cylinder consists of plunger which is used to build up the pressure by operating the handle. Plunger cylinder consists of two non-return valves i.e. one for suction and other for delivery. Ram cylinder consists of ram which lifts the load. The ram cylinder connected to delivery valve of plunger cylinder. It is also consists of lowering screw this is nothing but a hand operated valve used for releasing the pressure in the ram cylinder for get down the load. 35
CHAPTER 4 FABRICATION OF HYDRAULIC FORK LIFT
4.1 PROPOSED MODEL - HYDRAULIC FORK WITH JACK OF LIFITING CAPACITY 2 TONNES
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4.2 PROPOSED MODEL - HYDRAULIC FORK CRANK ROD FOR LIFITING AND PRESSURE PRODUCER
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4.3 HARDWARE USED IN PROJECT: Fabricated Scissor Jack •
Mounting Plate
•
Threaded Screw
•
Base Plate
•
Bearing
•
Coupling
•
Movable Joints
•
Steel Plates For Supporting
•
Welding Electrodes
Motor Hardware’s To Fit Power Supply Switch Castor Wheel Nut and bold
Angle 4.4 TOOLS USED IN PROJECT: Welding Machine Screw driver Spanner Soldering Rod Soldering flux 38
4.4 ESTIMATION OF THE PROJECT:
HARDWARE WORKS
ESTIMATION COST
FORK LIFT SET UP
500
CRANK ROD (CUTTING &SURFACING)
1500
BASE PLATE(CUTTING &GRINDING)
250
STEEL CASTOR WHEEL
500
NUTS AND BOLTS
250
HYDRAULIC OREING(LATHE)
1750
HYDRAULIC OIL RINGS(LATHE)
320
HYDRAULIC ASSEMBLING (RIVETING)
400
HYDRAULIC OIL
530
TOTAL
6000/-
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CHAPTER 5 CONCLUSION Thus we are able to reduce the effort and time taken by manual operation using forklift Also there is less vibration when compared to other mechanisms and therefore even fragile materials can be easily handled Hydraulic lifts require special care and regular maintenance to make sure it works in the desired manner. Improperly maintained lifts can cause serious injury. As with any hydraulic system, care should always be taken when operating hydraulic lifts. Even when the whole system is shut down, the oil can still be under pressure, which can be very dangerous if not handles properly. Leaks of hydraulic fluid are especially dangerous, as it is at very high pressure, and has the capability of puncturing human skin.
Care should be taken to allow only those people that are properly trained in the use of hydraulic lifts, and positioning vehicles are operating the equipment. The required hydraulic pressure should always be maintained, and should never be allowed to cross the recommended levels. The lift area should be kept clean of dirt, oil, tools, grit, etc. Also, it is never a good idea to overload a hydraulic lift.
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REFERENCES http://www.engineersedge.com http://www.efunda.com http://www.steeltubeinstitute.org http://www.emjmetals.com http://www.usstubular.com BOOKS REFERRED: 1. Machine design by RS KHURMI 2. Work shop technology by RK JAIN
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