CN205136195U - Horizontal equilibrium hydraulic control system of three point suspension mechanism of agro -farming machinery - Google Patents
Horizontal equilibrium hydraulic control system of three point suspension mechanism of agro -farming machinery Download PDFInfo
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- CN205136195U CN205136195U CN201520901550.0U CN201520901550U CN205136195U CN 205136195 U CN205136195 U CN 205136195U CN 201520901550 U CN201520901550 U CN 201520901550U CN 205136195 U CN205136195 U CN 205136195U
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Abstract
The utility model relates to a horizontal equilibrium hydraulic control system of three point suspension mechanism of agro -farming machinery, it includes hydraulic pump and the horizontal oil cylinder who controls three point suspension mechanism horizontal equilibrium, hydraulic pump connection has the 2nd magenetic exchange valve, the 2nd magenetic exchange valve is tribit four -way reversing valve, and during the meso position, its oil inlet ends with oil return opening intercommunication, scene 2 hydraulic fluid port, horizontal oil cylinder is connected through first hydraulically controlled check valve, second hydraulically controlled check valve respectively to the 2nd magenetic exchange valve's scene 2 hydraulic fluid port, the oil feed return circuit of the liquid accuse loop connection second hydraulically controlled check valve of first hydraulically controlled check valve, the oil feed return circuit of the first hydraulically controlled check valve of loop connection is controlled to the liquid of second hydraulically controlled check valve. Controlling horizontal oil cylinder through a magenetic exchange valve, the 2nd magenetic exchange valve and stretching out and withdraw, the level is kept all the time to farm tool such as messenger's beating machine.
Description
Technical field
The utility model relates to a kind of agro-farming machinery, especially relates to a kind of three-point hitch horizontal equilibrium hydraulic control system of agro-farming machinery.
Background technique
For agro-farming machinery such as tractor, rotary cultivator etc., especially large and middle tractor, the trifilar suspension mode that adopts mounts the tillage implements such as beating machine for paddy field, during operation more at present, because the soil specific resistance in mud is little, utilize the tilling depth of the wheel restriction beating machine for paddy field of tractor more.But, usually because plough pan is uneven, the left and right sidesing driving wheel of tractor is not walk in same plane, and when tractor tilts, tillage implements also and then tilts, work range due to tillage implements is longer in all agricultural machinery and implement, the specification 3800mm that such as beater is conventional, as long as tractor tilts 1 degree, two height of beater can differ 33mm, the paddy field of causing beater to have suffered is uneven, affects leveling effect.When plough pan injustice also can cause tractor to walk, uneven along the ground that direction of advance beater is had suffered, namely longitudinal tilling depth is inconsistent, increases number of times entirely, inefficiency.
Summary of the invention
The utility model object is to provide a kind of three-point hitch horizontal equilibrium hydraulic control system making tillage implements maintenance level.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the three-point hitch horizontal equilibrium hydraulic control system of agro-farming machinery, comprise the cross cylinder of oil hydraulic pump and control three-point hitch horizontal equilibrium, it is characterized in that: described oil hydraulic pump is connected with the second solenoid directional control valve; Second solenoid directional control valve is three position four-way directional control valve, and during meta, its filler opening is communicated with return opening, two oil outlet cut-offs; Two oil outlets of the second solenoid directional control valve connect cross cylinder respectively by the first Pilot operated check valve, the second Pilot operated check valve; The hydraulic control loop of the first Pilot operated check valve connects the oil-feed loop of the second Pilot operated check valve, and the hydraulic control loop of the second Pilot operated check valve connects the oil-feed loop of the first Pilot operated check valve.Stretched out and retraction by the first solenoid directional control valve, the second solenoid directional control valve level of control oil cylinder, make the tillage implements maintenance levels all the time such as beater.
As preferably, the oil-feed loop of the second described solenoid directional control valve is connected with safety circuit, and safety circuit is provided with relief valve.Relief valve limits the pressure of horizontal oil circuit control, opens protective system during overload.
As preferably, the pump discharge of oil hydraulic pump arranges diverter valve; One outlet connection second solenoid directional control valve of diverter valve, the poppet valve of another outlet connection control lift cylinder.Diverter valve is shunted according to total discharge, and when total input oil mass is less than setting value, oil all branches to horizontal control loop, and when inputting oil mass setting value, the oil content of increase flow to lifting control valve.
As preferably, oil hydraulic pump is duplex pump, the switching valve turning to loop that a pump discharge connects diverter valve, another pump discharge connects agro-farming machinery.More system control loop is provided, with satisfied different usage requirement, saves space, improve utilization ratio.
As preferably, the oil-feed loop of the second described solenoid directional control valve is connected with the first solenoid directional control valve; First solenoid directional control valve is 2/2-way selector valve, and oil outlet is communicated with the return opening of the second solenoid directional control valve.Make horizontal equilibrium control loop have higher Security and utilization efficiency, avoid producing energy consumption during non-cultivation condition.
Therefore, the utility model is stretched out by the first solenoid directional control valve level of control oil cylinder or is retracted, and regulates the level of tillage implements; And make cross cylinder pressurize by the first Pilot operated check valve, the second Pilot operated check valve, make tillage implements maintain level.The level that the utility model automatically carries out tillage implements controls, and has higher working efficiency, has the effect better regulating tillage implements level, maintain tillage implements level.In addition, whether be in cultivation condition according to tillage implements, controlled the oil-feed state of the second solenoid directional control valve by the first solenoid directional control valve, make horizontal equilibrium control loop have higher Security and utilization efficiency.
Accompanying drawing explanation
Accompanying drawing 1 is hydraulic schematic diagram of the present utility model.
Accompanying drawing 2 is schematic diagrams of three-point hitch.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: the three-point hitch horizontal equilibrium hydraulic control system of the utility model agro-farming machinery, as shown in Figure 1, it cross cylinder 1 comprising oil hydraulic pump 8 and control three-point hitch horizontal equilibrium, oil hydraulic pump 8 is connected with the second solenoid directional control valve 4; Second solenoid directional control valve 4 is three position four-way directional control valve, and during meta, its filler opening is communicated with return opening, two oil outlet cut-offs; Two oil outlets of the second solenoid directional control valve 4 connect cross cylinder 1 respectively by the first Pilot operated check valve 2, second Pilot operated check valve 3; The hydraulic control loop of the first Pilot operated check valve 2 connects the oil-feed loop of the second Pilot operated check valve 3, and the hydraulic control loop of the second Pilot operated check valve 2 connects the oil-feed loop of the first Pilot operated check valve 3.First Pilot operated check valve 2, second Pilot operated check valve 3, provides pressure holding function, when cross cylinder does not work, keeps oil cylinder at horizontal position;
The oil-feed loop of the second solenoid directional control valve 4 is connected with safety circuit, safety circuit is provided with relief valve 6.
The oil-feed loop of the second solenoid directional control valve 4 is connected with the first solenoid directional control valve 5; First solenoid directional control valve 5 is 2/2-way selector valve, and oil outlet is communicated with the return opening of the second solenoid directional control valve 4.
The pump discharge of oil hydraulic pump 8 arranges diverter valve 7; One outlet connection second solenoid directional control valve 4 of diverter valve 7, the poppet valve of another outlet connection control lift cylinder 9.
Oil hydraulic pump 8 is duplex pump, the switching valve turning to loop that a pump discharge connects diverter valve 7, another pump discharge connects agro-farming machinery.Diverter valve flow rate distribution, such as: when total input oil mass is less than 20L/min, the oil that oil hydraulic pump exports all branches to horizontal control loop, and when inputting oil mass and being greater than 20L/min, the oil content of increase flow to poppet valve.
Three-point hitch, its principle as shown in Figure 2, comprises two lower links 12 and two lift arms 13 that are rotationally connected with agro-farming machinery car body.Two lift arms 13 are rigidly connected, and joint is rotationally connected with car body, and wherein a lift arm 13 arranges a lift cylinder 9, or two lift arms 13 respectively establish a lift cylinder 9.Two lower link 12 front end carry tillage implements 14; Lower link 12 is rotatably connected to lifting arm 11, another root lower link 12 is rotatably connected to cross cylinder 1, and lifting arm 11 and cross cylinder 1 are rotationally connected with the free end of two lift arms 13 respectively.
For the working principle that level controls, be described for tractor below.During actual use, tractor carries out making beating operation in paddy field, because the plough pan in paddy field is uneven, the left and right sidesing driving wheel of tractor is not walk in same plane, such as when tractor is toward (from tailstock direction) during lopsidedness, level sensor on tractor car body detects angle of inclination, main electrically signalling, second solenoid directional control valve commutation, cross cylinder stretches out or retracts, the distance of stretching out or retract is by sensor feedback extremely main electric control box, stretch out or retract apart from after arrival, second solenoid directional control valve is back to meta, cross cylinder quits work, beater (i.e. tillage implements) still keeps level.Therefore, three-point hitch makes tractor be provided with automatic horizontal controlling functions, and except beater, when mounting other agricultural machinery and implement, also can control by automatic horizontal, working efficiency and effect all can improve greatly.
In order to horizontal equilibrium control loop has higher Security and utilization efficiency, therefore be provided with the first solenoid directional control valve 5.Its working principle is: be set up at car body or lift arm or lifting arm or upper connecting rod equipotential and arrange a sensor, for detecting the position of lift arm, if lift arm reach certain high point and above time, illustrate that tillage implements is raised to certain height, be in non-cultivation condition, now the first solenoid directional control valve 5 no electric circuit, the direct oil sump tank of oil that pump exports, whether no matter second solenoid directional control valve 4 be energized, no matter spool is in left position, meta, right position, cross cylinder is in the lock state all the time, and namely horizontal equilibrium controlling functions stops.Otherwise level-regulating system just can enter normal working state, namely horizontal equilibrium controlling functions just can work.
Claims (5)
1. the three-point hitch horizontal equilibrium hydraulic control system of an agro-farming machinery, comprise the cross cylinder (1) of oil hydraulic pump (8) and control three-point hitch horizontal equilibrium, it is characterized in that: described oil hydraulic pump (8) is connected with the second solenoid directional control valve (4); Second solenoid directional control valve (4) is three position four-way directional control valve, and during meta, its filler opening is communicated with return opening, two oil outlet cut-offs; Two oil outlets of the second solenoid directional control valve (4) connect cross cylinder (1) respectively by the first Pilot operated check valve (2), the second Pilot operated check valve (3); The hydraulic control loop of the first Pilot operated check valve (2) connects the oil-feed loop of the second Pilot operated check valve (3), and the hydraulic control loop of the second Pilot operated check valve (2) connects the oil-feed loop of the first Pilot operated check valve (3).
2. the three-point hitch horizontal equilibrium hydraulic control system of agro-farming machinery according to claim 1, is characterized in that: the oil-feed loop of described the second solenoid directional control valve (4) is connected with safety circuit, safety circuit is provided with relief valve (6).
3. the three-point hitch horizontal equilibrium hydraulic control system of agro-farming machinery according to claim 1, is characterized in that: the pump discharge of oil hydraulic pump (8) arranges diverter valve (7); One outlet connection second solenoid directional control valve (4) of diverter valve (7), the poppet valve of another outlet connection control lift cylinder (9).
4. the three-point hitch horizontal equilibrium hydraulic control system of agro-farming machinery according to claim 3, it is characterized in that: oil hydraulic pump (8) is duplex pump, the switching valve turning to loop that a pump discharge connects diverter valve (7), another pump discharge connects agro-farming machinery.
5. the three-point hitch horizontal equilibrium hydraulic control system of the agro-farming machinery according to claim 1 or 2 or 3 or 4, is characterized in that: the oil-feed loop of described the second solenoid directional control valve (4) is connected with the first solenoid directional control valve (5); First solenoid directional control valve (5) is 2/2-way selector valve, and oil outlet is communicated with the return opening of the second solenoid directional control valve (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520901550.0U CN205136195U (en) | 2015-11-12 | 2015-11-12 | Horizontal equilibrium hydraulic control system of three point suspension mechanism of agro -farming machinery |
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| CN201520901550.0U CN205136195U (en) | 2015-11-12 | 2015-11-12 | Horizontal equilibrium hydraulic control system of three point suspension mechanism of agro -farming machinery |
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| CN205136195U true CN205136195U (en) | 2016-04-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879370A (en) * | 2021-02-04 | 2021-06-01 | 江苏悟空风行科技有限公司 | Balance adjustment hydraulic valve set for farm tool |
| CN113586543A (en) * | 2021-07-27 | 2021-11-02 | 江苏徐工工程机械研究院有限公司 | Machine descending stability control method and system and tractor |
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2015
- 2015-11-12 CN CN201520901550.0U patent/CN205136195U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879370A (en) * | 2021-02-04 | 2021-06-01 | 江苏悟空风行科技有限公司 | Balance adjustment hydraulic valve set for farm tool |
| CN112879370B (en) * | 2021-02-04 | 2023-02-28 | 江苏悟空风行科技有限公司 | Balance adjustment hydraulic valve set for farm tool |
| CN113586543A (en) * | 2021-07-27 | 2021-11-02 | 江苏徐工工程机械研究院有限公司 | Machine descending stability control method and system and tractor |
| WO2023004999A1 (en) * | 2021-07-27 | 2023-02-02 | 江苏徐工工程机械研究院有限公司 | Method and system for controlling machine tool descent stability, and tractor |
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