Alat pengangkat Traktor - 1
ALAT PENGANGKAT 1. Umum • Peralatan-peralatan biasanya tersambung pada trak trakto torr deng dengan an kebe kebeba basa san n berg berger erak ak.. Pada Pada bagi bagian an bel belak akan ang g trak trakto torr oleh oleh pabr pabrik ik suda sudah h dipa dipasa sang ng suat suatu u peralatan angkat yang ukurannya sudah standar.
Penggantungan tiga titik (kategori I, II dan III).
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Alat pengangkat Traktor - 2
• Gaya yang dibutuhkan untuk menggerakkan peralatan angkat didapat dari sirkuit hidraulik kini (1971) 971) dile dileng ngka kapi pi deng engan alat lat pelay layanan nan semi otoma otomatis tis dimana dimana susuna susunan n setang setang perala peralatan tan secar secaraa prinsip sebenarnya susunan setang atau peralatan angkat itu dapat digerakkan dengan cara lain. • Gaya tangan masih digunakan pada traktor sangat kecil. Tekanan udara sangat baik hanya bila digunakan • pada posisi atas saja atau posisi kerja saja. • Peng engatur aturan an otom otomat atis is pad pada posi osisi terte ertent ntu u pra praktis ktis tidak dimungkinkan tanpa pemegasan yang rumit dari bantalan udaranya. • Pada ada umum umumny nyaa inst instal alas asii pneu pneuma mati tik k lebi lebih h mena menari rik k terhadap hidraulik karena ia kurang peka terhadap pengotoran. Enersi listrik • Le Tou Tourn rnea eau u mengh menghas asil ilka kan n mesin mesin pemi pemind ndah ah tanah tanah yang besar dan alat angkut lapangan dimana enersi untuk pengangkatannya didapat dari listrik. • Untu Untuk k pelay pelayan anan an jara jarak k jauh jauh dan otom otomat atis isas asii sang sangat at sederhana dengan enersi listrik, hanya harga instalasi demikian masih tinggi. • Ener Enersi si meka mekani niss yang yang didap didapat at dari dari pto pto dimula dimulaii 1945 1945 – 1955 1955;; kebe kebera rata tann nnya ya adal adalah ah,, adan adany ya sent sentak akan an waktu menggabungnya Perkembanga menuju
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Alat pengangkat Traktor - 3
• Pompa-pompa untuk instalasi hidraulik pada traktor hendaknya memenuhi persyaratan-persyaratan: a) Deng engan put putaran aran yang tetap etap hasil silnya nya har harus tida tidak k banyak bergantung dari tekanan. b) Hasil Hasilnya nya juga juga sesedik sesedikit it mungkin mungkin dipenga dipengaru ruhi hi oleh kekentalan minyak (atau minyaknya harus sesedikit mungkin terpengaruh oleh suhu). c) Peny Penyalu alura ran n miny minyak ak tanpa tanpa senta sentakan kan.. d) Beker Bekerja ja dengan dengan terpe terperc rcaya aya untuk untuk jangk jangkaa lama dan dengan demikian mempunyai efisiensi yang sekonstan mungkin. e) Andaikata tidak diinginkan, tekanan minyak membutuhkan daya minimal (kalau perlu dengan penyambungan penyambungan khusus).
Pompa roda gigi Pompa sekat Pompa plunger
p y n Q N/cm2 % put/men 1/men 500 – 1500 60 – 90 500 – 1800 10 – 30 700 80 – 85 600 – 2500 – 1000 – 3000 95 15 150 – 1500 –
N kw 2–6 – –
• Pompa digerakka kkan oleh poros engkol atau poros nok dari mesin. Kini (1971) mereka tak dapat dipi dipisa sahk hkan an dari dari mesi mesin. n. Miny Minyak akny nyaa seger segeraa bisa bisa didapat begitu mesin dinyalakan. (Dahulu memang terdapat pompa yang dapat dipisahkan dari mesin).
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Alat pengangkat Traktor - 4
Lambang
Arti pipa kerja pipa kemudi pipa pombocoran pipa terlengkung
Lambang
hubungan pipa pipa silang titik pembuang angin pipa menuju tanki hubungan tertutup pipa tertutup titik pecabangan kopeling cepat dengan dua katup pukul balik, tersambung penjelasan, penjelasan, dapat diatur
Arti lambang dasar kemudi geser jumlah medan = jumlah kedudukan penyambung penyambung dan dapat diyatakan diyatakan dengan angka penyambungan penyambungan pipa digambar pada medan yang menunjukan posisi nol dalam medan, garis menunjukan jalan aliran, panah menunjukan arah arus pemblokiran dinyatakan garis lintang
tersambungkan, jalan lintas dinyatakan dengan garis lintang Dalam kemudi geser, istilah geser adalah jumlah
dan kedudukan tersambung sebelumnya. misalnya: 4/3 geser berarti 4-jalan 3kedudukan pintu geser
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Alat pengangkat Traktor - 5
Lambang
Arti pompa dengan hasil tetap mengalirkan kesatu arah pompa dengan hasil variabel mengalirkan kesatu arah Motor: pengambilan minyak tetap/putaran; berputar ke satu arah Motor: pengambilan minyak variabel/ putaran; berputar ke satu arah tipe silinder piston, bekerja tunggal tipe silinder piston, bekerja ganda saklar tekan
Lambang
Arti kedudukan putar balik
kedudukan bebas
kedudukan blokir
kedudukan diferensial
kedudukan jalan
posisi akhir
posisi sejajar
akumulator hidraulik
posisi silang
saringan
katup pembatas
pendingin minyak
katup reduksi
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Alat pengangkat Traktor - 6
Lambang
Arti pelayanan mekanis
pelayanan tangan atau kaki pelayanan pelayanan hidradraulik langsung pelayanan pelayanan hidraulik dengan plunger pembantu pelayanan pelayanan elek tro maknetik pelayanan udara tekan
Lambang
Arti katup pengurang bebas
titik penghambat katup penghambat dapat diatur katup pukul balik penghambat katup pukul balik katup pukul balik dikendalikan hidrolik
penguatan penguatan dengan pegas elektromotor
kanki kangki bertekanan
motor bakar
manometer
• Untu Untuk k mengh menghind indar arii kerugi kerugian an day dayaa yang yang tida tidak k perl perlu, u, dikonstruksi sedemikian hingga bila tidak dibutuhkan tekanan, minyak itu mengalir kembali ke dalam reservoir (atau dalam sirkuit) atau dengan menutup bagian penghisapan pompa. Pada sketsa seper seperti ti digamb digambar arkan kan pompa pompa yang yang mmeny mmenyalu alurk rkan an minya inyak k dala dalam m juml jumlah ah penu penuh h tapi tapi tanp tanpaa teka tekana nan n sehingga kerugiannya ditekan seminimal mungkin. • Deng Dengan an cara cara baga bagaim iman anaa katu katup p kemud kemudii diko dikons nstr truk uksi si dapat dilihat pada sketsa berikur.
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Alat pengangkat Traktor - 7
2. Sistem hidrolik yang digunakan A. Sistem “Nudging”
• Instal stalaasi ini sangat ngat sederh erhana ana waktu pen penampil mpilaan pertamanya dalam pasaran. Plungernya (jadi juga kend kendar araa aann nnya ya)) dapa dapatt dian diangk gkat at pada pada kedu kedudu duka kan n maksimum, atau melayang tanpa tekanan.
tegangan pegas dapat disetel 0 – maks dengan tangan:
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Alat pengangkat Traktor - 8
• Disini diadakan perbaikan sedikit pada sistim sebe sebelu lumn mnya ya.. Plun Plunge gern rnya ya pada pada seti setiap ap kedu kedudu duka kan n dapat ditahan atau tanpa tekanan minyak melayang kalau alat itu seimbang di bawah pengaruh gaya yang bekerja padanya.
David Brown yang disempurnakan
Kedudukan pada gambar = tertahan. mengangkat atau kedudukan maks. menyusut atau melayang. C. Sistem pengaturan hidrolik yang otomatis (Automatic control system)
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Alat pengangkat Traktor - 9
X:
besaran yang dapat diatur misalnya: I kedalaman bajak II tahaman tarik IIII kedu II kedudu duka kan n peral peralat atan an terh terhad adap ap trak trakto tor r IV besa besara ran n yang yang mas masih ih mun mungk gkin in (sl (slip ip)) V kom kombina binasi si besar esaraan-b n-betar etaran an ter tersebu ebut di atas tas (= pengaturan campuran).
• Sist Sistim im penga pengatu tura ran n bert bertug ugas as agar agar X meng mengik ikuti uti sifa sifatt yang dilaginkan misalnya: kedalaman bajak yang konstan. Xi : nilai yang yang disetel disetel yaitu yaitu nilai nilai X dimana dimana pengatur pengaturan an itu disetel. Xa : penyimpangan penyimpangan yaitu selisih X dan Xi Xi • Pada Pada cont contoh oh ini ini pera peraba ba (rod (roda, a, mata mata baja bajak) k) berf berfung ungsi si sebagai elemen peraba (sensor) dari alat ukur. • Dari ari pera peraba ba X diuk diukur ur dan dan suat suatu u siny sinyal al yang ang memberi ukuran dikirimkan ke organ pembanding (kalau perlu melalui mekanisme pemindah seperti setel setang, kabe kabell bowd bowden en,, anta antara ran n mminy minyak ak,, antaran listrik).
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Alat pengangkat Traktor - 10
kemu kemudi di dala dalam m inst instal alas asii hidr hidrau auli lik) k) yang ang beke bekerj rjaa menurut ketentuan pada Xa. • Ketentuan ini dapat mengarah pada kerja proporsional atau integral. Akhirnya organ pengatur mempengaruhi organ perbaikan organ perbaikan (koreksi). • Dalam contoh ini organ ini bekerja sebagai pen penye yete tell yang yang meng mengha hasi silk lkan an gaya gaya,, deng dengan an mana mana mekanisme ini menempuh menempuh jalan pengaturan Y. Hal di atas diterangkan dalam bentuk skema balok.
Hasil kerja (efek) proporsional Y = konstanta x Xa. •
Hal ini kita jumpai dalam regulatur mesin diesel
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Alat pengangkat Traktor - 11 •
•
Disini besaran Xa proporsional terhadap kecepatan Y (atau Y = ∫ X dt). Efek Efek integr integral al dimanfaat dimanfaatkan kan agar efek waktu pembawaan diperkecil. Semua peralatan angkat hidrolik bekerja dengan prinsip ini, apabila pelaluan arus minyak ke sisi tekan (atau sisi pembuangan) sedikit banyak dapat dibuka (lihat lagi kopling balik).
• Waktu aktu pem pembaw bawaan: aan: janka anka waktu aktu anta antara ra terj terjad adin iny ya suat suatu u peru peruba baha han n (lini linier er)) X dan dan timb timbul ulny nyaa jala jalan n penyetelan penyetelan yang berbubungan Y. • Hal ini sehubungan dengan istilah kepekaan ber berea eaks ksii dar dari pera peraba ba.. Ini Ini adal adalah ah peny penyim impa pang ngan an minim inimal al dari ari per peraba aba yang dibu dibutu tuhk hkan an sebelu belum m bagian penyetel mulai bergerak. Perbandingan pengerasan Y/Xa • Apabila Y/Xa >1 maka sistem itu dengan cepat mendekati nilai baru dimana dapat timbul kelew kelewata atan n pada pada X (bera (berayun yun). ). Apabi Apabila la Y/Xa <1 maka X perlahan-lahan perlahan-lahan mendekati nilai barunya.
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Alat pengangkat Traktor - 12
pela pelaya yanan nan digera digerakan kan A → B dan dibiarkan pada posisi itu, maka organ pengatur (klep) meneruskan minyak kepada alat penyetel (silinder angkat). Oleh karenanya bergeraklah bergeraklah V → W.
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Alat pengangkat Traktor - 13
terpengaruh oleh ketidakrataan tanah, akibat roda depan, roda belakang dan bajak. • Suatu cara mengurangi kepekaan sengaja dipasangkan. Pada traktor yang membawa peralat alatan an yang ter tersam sambung ung secar cara kaku harus diperhitungkan efek "perhandingan balok angkat" sepe sepert rtii misal isalny nya: a: bila bila roda oda muka muka mela melalu luii tana tanah h yang tidak rata.
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Alat pengangkat Traktor - 14
• Deng Dengan an teka tekana nan n tanga tangan, n, Xi dise disete tell disamp disampin ing g kelep kelep kemu kemudi di juga juga diang diangka katt (terg (tergam amba bar) r).. Seti Setiap ap saat saat selalu ada tekanan pada plunger disilinder angkat dan susunan setang tak dapat bergerak bebas. • Pada ada keda edalam laman mini minim mal ± 20 cm dibagi bagian an muk muka sehu sehubu bung ngan an deng dengan an pene penemp mpata atan n roda roda pera peraba ba,, ia dapat dapat mencapai mencapai kedalaman kedalaman bajak bajak dengan dengan ketelitian ketelitian ± 10% pada tanah berat dan kering.
tarik
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Alat pengangkat Traktor - 15
• Mata bajak berfungsi sebagai peraba. Tongkat peng pengend endali ali dipasa dipasang ng pada pada posisi posisi menur menurun. un. Bajak Bajak dapat bebas bergerak (vertikal dan seimbang oleh gaya-gaya yang bekerja padanya. Dengan pembesaran tahanan bajak (a N/dm2 → b • N/dm2) maka setang atas bertekanan dan akibataya
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Alat pengangkat Traktor - 16
• Pada Pada tra trakto ktorr yang yang lebi lebih h besar besar seta setang ng ini ini seper seperti ti juga juga seta setang ng tari tarik k (di bawa bawah) h) sela selalu lu meng mengal alam amii gaya gaya tarik. • Setan Setang g tarik tarik terb terbawa awah h dapat dapat juga juga digu digunak nakan an (kar (karena ena kini kini penu penutu tupa pan n miny minyak ak suda sudah h terp terper erca caya ya)) untu untuk k melayani organ pengatur. (Pada Same dan Renault melalui suatu balok angkat sedangkan pada John Deere melalui pembengkokan pada batang penghubung). III. Pengaturan posisi
Apabila sekali telah dipilih suatu posisi alat terhadap traktor maka secara otomatis akan dipertahankan pada keadaan itu. • Apabila alat turun (misalnya karena kebocoran minyak) maka akan dialirkan lebih banyak minyak •
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Alat pengangkat Traktor - 17
p.m. - Fenomena kopeling umpan balik dapat berfungsi
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Alat pengangkat Traktor - 18
mesin esin uap dike ikenal nal sebaga bagaii gunti unting ng Stephe ephessson son (untuk memajukan-memundurkan kereta api). Perhatian tambahan
• Pada beberapa sistem pengaturan, kecepatan penyetelan dapat dipengaruhi. Hal ini dapat dicapai agar selisih kecepatan reaksi dapat tercapai dengan memperhitungkan ketergantungannya pada akti aktivi vita tass tert terten entu tu misa misaln lnya ya:: memb membaj ajak ak terh terhad adap ap aktivitas pemeliharaan. pemeliharaan.
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Alat pengangkat Traktor - 19
pada buka, penuh apabila tongkatya digerakkan ke arah angkat). padaa arah arah kelu keluar ar;; memb membat atas asii kece kecepa pata tan n jatuh atuh pad dari mekanisme itu. Metoda ke 2
• Peru erubaha bahan n le lenga ngan bal balok angka ngkat. t. Pada beb beberap erapaa merek titik penyambungan pada setang atas dimungkinkan dipasang dipelbagai tempat.
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Alat pengangkat Traktor - 20
• Isti Istila lah h "pen "penga gamb mbil il alih alihan an bobo bobot" t" dipa dipaka kaii ata atass sif sifat at per perala alatan tan angkat angkat otomat otomatis is dimana dimana dimung dimungkin kinkan kan gaya-gaya tumpu pada tanah terhadap traktor dan baj bajak ak diru diruba bah h sehi sehing ngga ga roda roda-r -rod odaa trak trakto torr bera berada da pada situasi yang lebih baik terhadap fungsi yang harus dilakukannya. • Apab pabila ila sam sambun bungan gan bajak jak denga engan n traktor ktor kak kaku (mati (mati)) maka maka penump penumpuan uannya nya dapat dapat diumpa diumpama makan kan sebagai balok yang mempunyai 3 titik tumpu.
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Alat pengangkat Traktor - 21
Ini adalah kasus pembebanan statis yang tak dapat dipastikan. Apabila bajak dapat bergerak melalui engs engsel el maka maka perh perhit itun unga gan n gaya gaya-g -gay ayaa tump tumpu u akan akan sede sederh rhan anaa (kas (kasus us pemb pembeb eban anan an stat statis is yang yang dapa dapatt ditentukan). • Penggunaan peralatan angkat otomatis akan membuat engsel itu tidak lagi bebas gerakannya. Pada Pada umum umumny nyaa akan akan terjad terjadii pere pereda dama man. n. Mala Malah h mungkin akan dilakukan gaya (arah ke atas) terhadap bajak (disini tergambar sebagai pegas). • Gaya yang arahnya ke atas ini membuat fungsi •
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Alat pengangkat Traktor - 22
• Misalnya tongkat diangkat kearah tahan han dim dimana seca secara ra bers bersam amaa aan n ters tersam ambu bung ng suat suatu u pent pentil il arus arus lebih dengan separuhnya tekanan buka normal. • Untuk ntuk ini ini David avid Brow Brown n mem membuat buat katup katup arus arus lebi lebih h yang ke 3 (lihat sebelumnya). Pengarah baik yang sama terhadap keadaan traksi dari roda belakang
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Alat pengangkat Traktor - 23
• Pada Pada per perala alatan tan ang angkat kat hidr hidraul aulik ik serin sering g terdap terdapat at titik titik penyam nyambu bung ngan an eks ekstra tra untuk tuk sili silin nder der hidr hidrau auli lik k