CS277431B6

CS277431B6 - Hydraulic front three-point hitch control system, especially for agricultural tractor

Info

Publication number: CS277431B6
Application number: CS886834A
Authority: CS
Inventors: Sli Nski Tadeusz Mgr Ing Chru; Znik Antoni Mgr Ing Rze
Original assignee: Zts Vyskumno Vyvojovy Ustav A
Priority date: 1987-12-30
Filing date: 1988-10-17
Publication date: 1993-03-17
Also published as: PL269802A1; CS683488A3; PL159117B1

Abstract

Hydraulický systém sa skládá z rozvádzača (1), připojeného k poistnému ventilu (3), a spatnému škrtiacemu ventilu (4), připojenému k hydraulickým jednočinným valcom (5). Medzi rozvádzač (1) a poistný ventil (3) je vložená jednočinná hydraulická zámka (2), ktorá má v telese umiestnený spatný ventil (7) a zasunuté puzdro (9), v ktorom je umiestnený piest (8) s ručným ovládačom (10). V puzdre (9) sú vytvořené škrtiace otvory (11) spojené s odpadom (16). Ručný ovládač (10) tvoří tyčová skrutka, zaskrutkovaná v spojke (13), ktorá je zasunutá do puzdrá (9).The hydraulic system consists of a distributor (1), connected to a safety valve (3), and a check valve (4), connected to hydraulic single-acting cylinders (5). A single-acting hydraulic lock (2) is inserted between the distributor (1) and the safety valve (3), which has a check valve (7) located in the body and a inserted sleeve (9), in which a piston (8) with a manual actuator (10) is located. Throttle holes (11) are formed in the sleeve (9) connected to the waste (16). The manual actuator (10) is formed by a rod screw screwed into a coupling (13), which is inserted into the sleeve (9).

Description

Vynález rieši hydraulický systém ovládania predného trojbodového závěsu, hlavně pre poínohospodársky traktor.The invention relates to a hydraulic control system for a front three-point hitch, mainly for an agricultural tractor.

Sú známe hydraulické systémy, kde válec, ktorý zdvihá predný trojbodový závěs náradia je ovládaný priamo posúvačovým rozvádzačom. Toto riešenie má tu nevýhodu, že systém nie je těsný a závažie zavesené na trojbodovom závese rýchlo klesá. Sú tiež známe systémy zavesenia náradia so spatným ovládaným ventilom, v ktorom po otvorení ventilu piestikom je olej z čerpadla tlačený cez poistný ventil čerpadla. Nevýhodou tohoto riešenia je, že pri každom spúšťaní náradia je systém zatažený maximálnym tlakom a nie je možné spustit náradie pri nepracujúcom motore.Hydraulic systems are known in which the cylinder which lifts the front three-point hitch of the tool is controlled directly by a slide distributor. This solution has the disadvantage that the system is not tight and the weight suspended on the three-point hitch decreases rapidly. Tool suspension systems with a poorly operated valve are also known, in which, after opening the valve with a piston, the oil from the pump is pushed through the safety valve of the pump. The disadvantage of this solution is that every time the tool is started, the system is subjected to the maximum pressure and it is not possible to start the tool when the engine is not running.

Uvedené nevýhody odstraňuje hydraulický systém ovládania predného trojbodového závěsu, ktorý sa skládá z rozvádzača připojeného k poistnému ventilu a spatnému škrtiacemu ventilu, připojenému k hydraulickým jednočinným valcom, podlá vynálezu, ktorého podstata spočívá v tom, že medzi rozvádzač a poistný ventil je vložená jednočinná hydraulická zámka, ktorá má v telese umiestnený spatný ventil a zasunuté puzdro, v ktorom je umiestnený piest s ručným ovládačem, pričom v puzdre sú vytvořené škrtiace otvory, spojené s odpadom. Ručný ovládač tvoří tyčová skrutka, zaskrutkovaná v spojke, ktorá je zasunutá do puzdra.The above-mentioned disadvantages are eliminated by the hydraulic control system of the front three-point hitch, which consists of a distributor connected to the safety valve and a bad throttle valve connected to the hydraulic single-acting cylinders according to the invention, which consists in inserting a single-acting hydraulic lock between the distributor , which has a bad valve housed in the body and a sleeve inserted, in which a piston with a manual actuator is housed, the throttle holes being connected to the waste in the housing. The manual control consists of a rod screw, screwed into a coupling, which is inserted into the housing.

Výhodou riešenia podlá vynálezu je možnost spúštania náradia, respektive závažia, pri nepracujúcom motore a použitie hydraulickéj zámky zaistuje těsnost hydraulického systému. V případe havárie motora a nedostatočnom tlaku, systém umožňuje vyhnút sa nebezpečnému zastaveniu náradia v transportněj polohe. Riešenie umožňuje spúštanie závažia pri nepracujúcom motore pomocou ovládača a po otvorení spatného ventilu tlakový priestor spolu s odpadom ódlahčuje čerpadlo v čase spúštania motora.The advantage of the solution according to the invention is the possibility of lowering the tool or the weight, respectively, when the engine is not running and the use of a hydraulic lock ensures the tightness of the hydraulic system. In the event of an engine accident and insufficient pressure, the system makes it possible to avoid dangerous stopping of the tool in the transport position. The solution allows the weight to be started when the engine is not running by means of the controller, and after opening the wrong valve, the pressure space together with the waste relieves the pump at the time of starting the engine.

Vynález je znázorněný na priloženom výkrese, kde na obr. 1 je schéma hydraulického systému ovládania predného trojbodového závěsu á na obr. 2 je hydraulická zámka v řeze.The invention is illustrated in the accompanying drawing, in which FIG. 1 is a diagram of the hydraulic control system of the front three-point hitch of FIG. 2 is a sectional view of the hydraulic lock.

Hydraulický systém sa skládá z hydraulického posúvačového rozvádzača 1, připojeného k jednočinnej hydraulickéj zámke 2, spojenej s riadeným poistným ventilom 2 a spatným škrtiacim ventilom 4, připojeným k hydraulickým jednočinným valcom 5. Jednočinná hydraulická zámka 2 je zaradená v systéme medzi rozvádzačom 1 a poistným ventilom 3 a má za ciel dokonalé utesnenie systému.The hydraulic system consists of a hydraulic slide valve 1 connected to a single-acting hydraulic lock 2, connected to a controlled safety valve 2 and a bad throttle valve 4 connected to hydraulic single-acting cylinders 5. A single-acting hydraulic lock 2 is arranged in the system between the valve 1 and the safety valve. 3 and aims at a perfect sealing of the system.

Jednočinná hydraulická zámka 2 má v telese 6 umiestnený spatný ventil 7 a zasunuté puzdro 9, v ktorom je umiestnený piest 8. s ručným ovládačem 10 na mechanické ovládanie piesta 2· ^v puzdre 9 sú vytvořené škrtiace otvory 11, ktoré sú spojené s odpadom 16. Pri uzavretom spátnom ventile 7 sú škrtiac^.otvory 11 uzatvorené válcovou plochou piesta 8. Po otvorení spatného ventilu 7 sú škrtiace otvory 11 otvorené a spoja tlakový priestor 12 s odpadom 16, pričom je udržiavaný malý přetlak, ktorý umožňuje udržať spatný ventil 7 v otvorenej polohe. Ručný ovládač 10 tvoří tyčová skrutka, zaskrutkovaná v spojke 13, ktorá je zasunutá do puzdra 9.Two single-action hydraulic lock is arranged in the housing 6 and the check valve 7 inserted sleeve 9 in which a piston 8 with a hand switch 10 on the mechanical operation of the piston 2 · 9 ^{in the} housing are formed by the flow restriction opening 11, associated with the waste 16th When the non-return valve 7 is closed, the throttling openings 11 are closed by the cylindrical surface of the piston 8. After opening the non-return valve 7, the throttling openings 11 are open and position. The manual actuator 10 is formed by a rod screw, screwed into the coupling 13, which is inserted into the housing 9.

- CS 277431 B6 2 Μ . '- CS 277431 B6 2 Μ. '

Hydraulický systém má tri funkcie. V polohe zdvíhania je olej vedený z rozvádzača 1 do priestoru 14, otvára spatný ventil 7 jednočinnej hydraulickéj zámky 2, spatný škrtiaci ventil 4 a preteká do hydraulických jednočinných valcov 5.The hydraulic system has three functions. In the lifting position, the oil is led from the distributor 1 to the space 14, opens the bad valve 7 of the single-acting hydraulic lock 2, the bad throttle valve 4 and flows into the hydraulic single-acting cylinders 5.

V neutrálněj polohe je spatný ventil 7 zatvorený a neumožňuje pretekanie oleja v riadiacich častiach posúvačového rozvádzača 1· ·In the neutral position, the bad valve 7 is closed and does not allow oil to flow in the control parts of the slide valve 1 · ·

V polohe spúšťania je olej z rozvádzača 1 vedený do tlakového priestoru 12, piest 8 presúva dolava, pričom otvára spatný ventil 7. Po otvorení spatného ventilu 7 zadná hrana 15 piesta 8. uvolní škrtiace otvory 11 puzdra 2/ čo umožní prietok oleja z čerpadla do nádrže. Vtedy olej z hydraulických jednočinných valcov 5 preteká cez spatný škrtiaci ventil 4 a otvorený spatný ventil 7 do priestoru 14 a cez rozvádzač 1 do nádrže. Hydraulický systém podlá vynálezu je využitelný u polnohospodárskych strojov, najma u polnohospodárskych traktorov.In the lowering position, the oil from the distributor 1 is led to the pressure space 12, the piston 8 moves to the left, opening the bad valve 7. After opening the bad valve 7, the rear edge 15 of the piston 8 releases the throttling openings 11 of the housing 2. tanks. Then the oil from the hydraulic single-acting cylinders 5 flows through the bad throttle valve 4 and the open bad valve 7 into the space 14 and through the distributor 1 into the tank. The hydraulic system according to the invention can be used in agricultural machines, in particular in agricultural tractors.

Claims

9 CS 277431 B6 2 Μ The hydraulic system has three functions. In the lifting position of the needle guided from the distributor 1 to the space 14, the poor valve 7 opens the single acting hydraulic lock 2, the throttle valve 4a flows into the hydraulic single acting cylinders 5. In the neutral position, the bad valve 7 is closed and does not allow oil to flow in the control parts of the slide valve 1. In the lowering position, the oil from the distributor 1 is guided into the pressure chamber 12, the piston 8 is moved to the left, opening the rear valve 7. After opening the bad valve 7, the rear edge 15 of the piston 8. releasing the throttle holes 11 of the housing 9, allowing oil to flow from the pump to the tank. At that time, the oil from the hydraulic single acting cylinders 5 flows through the low throttle valve 4 and opens the rear valve 7 into the space 14 and through the distributor 1 into the tank. The hydraulic system of the invention is applicable to agricultural machinery, especially for agricultural tractors. PATENTED CLAIMS

1. Hydraulic front three-point hitch control system, mainly for an agricultural tractor, consisting of a distributor connected to a safety valve and a faulty throttle valve connected to a hydraulic single acting cylinder characterized in that between the distributor (1) and the safety valve the valve (3) is a single acting hydraulic lock (2) having a valve (7) disposed in the body (6) and a retracted housing (9) in which the piston (8) with the manual actuator (10) is located; throttle openings (11) are provided to the housing (9) associated with the outlet (16).

2. The hydraulic system for controlling the front three-point hitch according to claim 1, characterized in that the hand control (10) is a screw-bolt screwed into the coupling (13) which is inserted into the housing (9). 1 drawing