Electric control lift valve hydraulic system and tractor

Abstract

The utility model provides an electric control lift valve hydraulic system and a tractor, the electric control lift valve hydraulic system comprises a neutral position module, a lifting control module and a descending and strong pressure control module which are connected with one another, the neutral position module comprises a first switch electromagnetic valve and a second switch electromagnetic valve, and oil flows back through the first switch electromagnetic valve and the second switch electromagnetic valve; the lifting control module comprises a lifting control valve and a first proportional pressure reducing valve, and oil liquid enters the first cavity through the first proportional pressure reducing valve and the lifting control valve; the descending and strong pressure control module comprises a descending control valve and a second proportional pressure reducing valve, and oil in the first cavity flows back through the second proportional pressure reducing valve and the descending control valve. According to the electric control lift valve hydraulic system, control over the lifting, descending and high-pressure functions of the tractor can be achieved, the lifting speed and the descending speed can be controlled, the displacement amount of a valve element of a valve set is controlled in the mode of controlling the outlet pressure, the lifting speed and the descending speed are accurately adjusted, the control precision is high, and the cost is low.

Description

Technical Field

[0001] This application relates to the field of tractor hydraulic systems, and in particular to an electronically controlled lift valve hydraulic system and a tractor. Background Technology

[0002] When a tractor is in operation, an electronically controlled lift valve is often used to control the hydraulic operation of the tractor's lifting system. Existing electronically controlled lift valves with high-pressure functions are mostly stepper motor-driven spool valves, which are expensive, bulky, and have poor control precision. Furthermore, stepper motors are highly sensitive to environmental conditions, and their lifespan is significantly affected by environmental factors. In addition, cartridge-type electronically controlled lift valves can only control lifting, lowering, and floating functions, and the control precision for lifting and lowering speeds is poor; they generally do not have a high-pressure function.

[0003] Therefore, it is necessary to design an electrically controlled lifting valve hydraulic system to solve the above problems. Utility Model Content

[0004] In view of this, in order to overcome the shortcomings of the prior art, this utility model provides an electrically controlled lifting valve hydraulic system and a tractor, which effectively solves the problems of high cost, large size, poor control accuracy and high requirements for the operating environment of the stepper motor driven slide valve. At the same time, it solves the problems of the cartridge valve type of electrically controlled lifting valve, which can only realize the control of lifting, lowering and floating functions, and has poor control accuracy of lifting speed and lowering speed and does not have a strong pressure function.

[0005] According to a first aspect of this utility model, an electrically controlled lifting valve hydraulic system is provided for the operation of a hydraulic cylinder. The hydraulic cylinder includes a first chamber and a second chamber. The electrically controlled lifting valve hydraulic system includes a neutral position module, a lifting control module, and a lowering / high-pressure control module connected to each other. The neutral position module includes a first solenoid valve and a second solenoid valve, through which hydraulic fluid flows back. The lifting control module includes a lifting control valve and a first proportional pressure reducing valve, through which hydraulic fluid enters the first chamber. The lowering / high-pressure control module includes a lowering control valve and a second proportional pressure reducing valve, through which hydraulic fluid in the first chamber flows back.

[0006] Preferably, the hydraulic system of the electrically controlled lifting valve further includes a third switching solenoid valve, which is connected to the intermediate position module, the lifting control module, and the descent and high pressure control module.

[0007] Preferably, when the lifting control module is activated, the oil flows back to the oil tank through the second cavity, the third solenoid valve, and the second solenoid valve.

[0008] Preferably, when the descent and high-pressure control module is activated, the oil flows into the second cavity through the first and third solenoid valves.

[0009] Preferably, the hydraulic system of the electrically controlled lifting valve further includes a floating module. When the floating module is activated, the oil in the first chamber flows back to the oil tank through the second proportional pressure reducing valve and the lowering control valve; the oil in the second chamber flows back to the oil tank through the third switching solenoid valve and the second switching solenoid valve.

[0010] Preferably, when the floating module is activated, the oil in the tank flows back to the tank through the first and second solenoid valves.

[0011] Preferably, the hydraulic system of the electrically controlled lifting valve further includes a safety valve, which is connected to the intermediate position module, the lifting control module, and the descent and high pressure control module.

[0012] Preferably, the hydraulic system of the electrically controlled lifting valve further includes a check valve, which is disposed between the lifting control valve and the first cavity.

[0013] Preferably, the hydraulic system of the electrically controlled lifting valve is further provided with a throttling orifice.

[0014] According to a second aspect of the present invention, a tractor is provided, wherein the tractor includes an electronically controlled lift valve hydraulic system as described above.

[0015] According to the present invention, the electro-hydraulic system for lifting valves, through the cooperation of a neutral position module, a lifting control module, and a lowering / high-pressure control module, can control the lifting, lowering, and high-pressure functions of a tractor, and the lifting and lowering speeds are controllable. The lifting control valve and the lowering control valve can be controlled by a first proportional pressure reducing valve and a second proportional pressure reducing valve, respectively, thereby controlling the displacement of the valve cores of the lifting control valve and the lowering control valve by controlling the outlet pressure. This allows for more precise adjustment of the lifting and lowering speeds, resulting in high control accuracy and reduced costs. The overall structure of this electro-hydraulic system for lifting valves is simple, uses a small number of valve groups, and can be used with various tractor specifications.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an electrically controlled lifting valve hydraulic system according to an embodiment of the present invention is shown.

[0019] Reference numerals: 1-First switching solenoid valve; 2-Second switching solenoid valve; 3-First proportional pressure reducing valve; 4-Lift control valve; 5-Safety valve; 6-Second proportional pressure reducing valve; 7-Lower control valve; 8-Check valve; 9-Throttle orifice; 10-Third switching solenoid valve; 11-First cavity; 12-Second cavity; P-Connecting port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] According to the present invention, an electrically controlled lifting valve hydraulic system is provided, such as... Figure 1 As shown, the electro-hydraulic lifting valve system is used for the motion control of the hydraulic cylinder. The hydraulic cylinder can be a component of the prior art, comprising a first chamber 11 and a second chamber 12. The first chamber 11 can be the large chamber of the hydraulic cylinder, and the second chamber 12 is the small chamber of the hydraulic cylinder. The electro-hydraulic lifting valve system includes a neutral position module, a lifting control module, and a lowering / high pressure control module that are connected to each other.

[0025] In the following description, reference will be made to Figure 1 This section describes the detailed structure of the center position module, lifting control module, and descent and high pressure control module of the electro-hydraulic system for the electric lifting valve.

[0026] like Figure 1 As shown, in this embodiment, the neutral position module includes a first solenoid valve 1 and a second solenoid valve 2. Oil flowing from the oil tank (not shown) returns through the first solenoid valve 1 and the second solenoid valve 2 to maintain the neutral position, allowing the cylinder to stop at any position and keeping the entire system in a machine position holding state. The lifting control module may include a lifting control valve 4 and a first proportional pressure reducing valve 3. Oil flowing from the oil tank passes through the first proportional pressure reducing valve 3 and the lifting control valve 4 into the first chamber 11, causing the cylinder to perform a lifting action. By adjusting the current of the first proportional pressure reducing valve 3, the pressure at its outlet can be adjusted, thereby controlling the opening size of the lifting control valve 4 and adjusting the lifting speed. The descent and high-pressure control module may include a descent control valve 7 and a second proportional pressure reducing valve 6. The oil in the first chamber 11 flows back through the second proportional pressure reducing valve 6 and the descent control valve 7. When the cylinder descends, a portion of the oil enters the descent control valve 7 through the second proportional pressure reducing valve 6, thereby causing the cylinder to perform a high-pressure or descent action. By adjusting the current of the second proportional pressure reducing valve 6, the pressure at its outlet is adjusted, thereby controlling the opening size of the descent control valve 7 and thus adjusting the descent speed of the cylinder.

[0027] This electro-hydraulic lift valve system, through the cooperation of a neutral position module, a lift control module, and a descent / high-pressure control module, enables control of the tractor's lift, descent, and high-pressure functions, with controllable lift and descent speeds. The lift control valve 4 and descent control valve 7 can be controlled respectively via a first proportional pressure reducing valve 3 and a second proportional pressure reducing valve 6, thereby controlling the displacement of the valve cores of the lift control valve 4 and descent control valve 7 by controlling the outlet pressure. This allows for more precise adjustment of lift and descent speeds, resulting in high control accuracy while reducing costs. The overall structure of this electro-hydraulic lift valve system is simple, uses a small number of valve groups, and can be used with various tractor specifications.

[0028] Preferably, such as Figure 1 As shown in the embodiment, the electro-hydraulic lifting valve system further includes a third solenoid valve 10, which is connected to the neutral position module, the lifting control module, and the descent and high-pressure control module. The third solenoid valve 10 can assist in regulation, thereby further improving the control accuracy of the electro-hydraulic lifting valve system.

[0029] Preferably, such as Figure 1 As shown in the embodiment, when the lifting control module is activated, the oil in the second cavity 12 flows back to the oil tank through the second cavity 12, the third switch solenoid valve 10, and the second switch solenoid valve 2.

[0030] Preferably, such as Figure 1 As shown in the embodiment, when the descent and high pressure control module is activated, the oil in the second chamber 12 enters the second chamber 12 by passing through the first switch solenoid valve 1 and the third switch solenoid valve 10.

[0031] Preferably, such as Figure 1 As shown, in this embodiment, the hydraulic system of the electrically controlled lifting valve also includes a floating module. When the floating module is activated, the oil in the first chamber 11 flows back to the oil tank through the second proportional pressure reducing valve 6 and the descent control valve 7; the oil in the second chamber 12 flows back to the oil tank through the third switching solenoid valve 10 and the second switching solenoid valve 2. At this time, the oil cylinder is in a floating state.

[0032] Preferably, such as Figure 1 As shown in the embodiment, when the floating module is activated, the oil in the oil tank flows back to the oil tank through the first switch solenoid valve 1 and the second switch solenoid valve 2 to ensure that no new oil flows into the oil cylinder, thus maintaining a floating state.

[0033] Preferably, such as Figure 1As shown in the embodiment, the electrically controlled lifting valve hydraulic system also includes a safety valve 5, which is connected to the neutral position module, the lifting control module, and the descent and high-pressure control module. The safety valve 5 limits the maximum system pressure to prevent overpressure from damaging the equipment.

[0034] Preferably, such as Figure 1 As shown, in this embodiment, the hydraulic system of the electrically controlled lifting valve also includes a check valve 8, which is disposed between the lifting control valve 4 and the first chamber 11 and can prevent oil backflow.

[0035] Preferably, such as Figure 1 As shown in the embodiment, the hydraulic system of the electrically controlled lifting valve is also provided with a throttle orifice 9. The throttle orifice 9 limits the flow rate of oil through the throttle orifice 9 by reducing the flow area, thereby controlling the flow rate of the hydraulic system. This can avoid excessive or insufficient oil supply and ensure the stable operation of the system.

[0036] The hydraulic system of the electrically controlled lift valve includes a neutral position, a lift position, a descent high-pressure position, and a floating position. The specific implementation methods for these positions are as follows:

[0037] When in the neutral position, the first solenoid valve 1 is energized, and its lower position is activated. The other solenoid valves are de-energized. At this time, the oil flows from the connection port P through the lower position of the first solenoid valve 1 and the left position of the second solenoid valve 2 back to the oil tank. The oil cylinder can then stop at any position, remaining in the tool position holding state.

[0038] When in the lifting state, the first solenoid valve 1 and the second solenoid valve are de-energized, while the third solenoid valve 10 is energized, the first proportional pressure reducing valve 3 is energized, and the second proportional pressure reducing valve 6 is de-energized. A portion of the oil flows through the lower position of the first proportional pressure reducing valve 3 into the right end of the lifting control valve 4, compressing the spring at its left end, causing the lifting control valve 4 to move to the left. This opens the one-way valve 8, allowing the oil to enter the first chamber 11 of the cylinder. The oil in the second chamber 12 of the cylinder flows back to the oil tank through the left positions of the third solenoid valve 10 and the first proportional pressure reducing valve 3. During lifting, the pressure at the outlet of the first proportional pressure reducing valve 3 can be adjusted by controlling the current, thereby controlling the opening size of the lifting control valve 4 and adjusting the lifting speed.

[0039] Under the condition of high-pressure descent: First solenoid valve 1, second solenoid valve 2, third solenoid valve 10, and second proportional pressure reducing valve 6 are all energized, while first proportional pressure reducing valve 3 is de-energized. Oil enters the second chamber 12 of the cylinder through the lower position of first solenoid valve 1 and the left position of third solenoid valve 10. In the first chamber 11 of the cylinder, through the right position of second proportional pressure reducing valve 6, a portion of the oil enters the right end of the descent control valve 7 and compresses its left-end spring, causing the descent control valve 7 to move to the left, and the cylinder performs a high-pressure or descent action. During high-pressure descent, the pressure at the outlet of the second proportional pressure reducing valve 6 can be adjusted by adjusting the current, thereby controlling the opening size of the descent control valve 7 and adjusting the descent speed.

[0040] In the floating state: the first solenoid valve 1 is energized, the second solenoid valve 2 is de-energized, the third solenoid valve 10 is energized, the first proportional pressure reducing valve 3 is de-energized, and the second proportional pressure reducing valve 6 is energized. Oil flows through the connection port P to the lower position of the first solenoid valve 1 and back to the oil tank via the second solenoid valve 2. Oil in the second chamber 12 of the cylinder flows back to the oil tank via the left position of the third solenoid valve 10 and the left position of the second solenoid valve 2; oil in the first chamber 11 of the cylinder flows back to the oil tank via the right position of the descent control valve 7. At this time, the cylinder is in a floating state.

[0041] This electro-hydraulic lift valve system, through the cooperation of a neutral position module, a lift control module, and a descent / high-pressure control module, enables control of the tractor's lift, descent, and high-pressure functions, with controllable lift and descent speeds. The lift and descent control valves are controlled separately by a first and a second proportional pressure reducing valve, thereby controlling the displacement of the valve cores of the lift and descent control valves by controlling the outlet pressure. This allows for more precise adjustment of lift and descent speeds, resulting in high control accuracy and reduced costs. The overall structure of this electro-hydraulic lift valve system is simple, using a small number of valve groups, and can be used with various tractor specifications.

[0042] Furthermore, according to a second aspect of the present invention, a tractor is provided, the tractor including the electro-hydraulic system for lifting valves as described above.

[0043] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An electrically controlled poppet valve hydraulic system for actuation of a ram, the ram comprising a first chamber and a second chamber, characterized by, The electro-hydraulic system of the lifting valve includes a neutral position module, a lifting control module, and a descent and high-pressure control module connected to each other. The neutral position module includes a first solenoid valve and a second solenoid valve, through which oil flows back. The lifting control module includes a lifting control valve and a first proportional pressure reducing valve, through which oil enters the first cavity. The descent and high-pressure control module includes a descent control valve and a second proportional pressure reducing valve, through which oil in the first cavity flows back.

2. The electrically controlled poppet valve hydraulic system according to claim 1, wherein The hydraulic system of the electrically controlled lifting valve also includes a third switching solenoid valve, which is connected to the mid-position module, the lifting control module, and the descent and high-pressure control module.

3. The electrically controlled poppet valve hydraulic system according to claim 2, wherein When the lifting control module is activated, the oil flows back to the oil tank through the second chamber, the third solenoid valve, and the second solenoid valve.

4. The electrically controlled poppet valve hydraulic system according to claim 2, wherein When the descent and high-pressure control module is activated, the oil flows into the second cavity through the first and third solenoid valves.

5. The electrically controlled poppet valve hydraulic system according to claim 2, wherein The hydraulic system of the electrically controlled lifting valve also includes a floating module. When the floating module is activated, the oil in the first chamber flows back to the oil tank through the second proportional pressure reducing valve and the descent control valve. The oil in the second cavity flows back to the oil tank through the third solenoid valve and the second solenoid valve.

6. The electrically controlled poppet valve hydraulic system according to claim 5, wherein When the floating module is activated, the oil in the tank flows back to the tank through the first and second solenoid valves.

7. The electrically controlled poppet valve hydraulic system of claim 1, wherein, The hydraulic system of the electrically controlled lifting valve also includes a safety valve, which is connected to the intermediate position module, the lifting control module, and the descent and high pressure control module.

8. The electrically controlled poppet valve hydraulic system of claim 1, wherein, The hydraulic system of the electrically controlled lifting valve also includes a check valve, which is disposed between the lifting control valve and the first cavity.

9. The electrically controlled poppet valve hydraulic system of claim 1, wherein, The hydraulic system of the electrically controlled lift valve is also equipped with a throttling orifice.

10. A tractor characterised in that, The tractor includes the electronically controlled lift valve hydraulic system as described in any one of claims 1 to 9.

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