Tractor multi-way valve capable of electrically controlling falling

Abstract

The utility model discloses a tractor multi-way valve capable of electrically controlling falling. The problems that pressure oil on an existing agricultural machine cannot be stored, the pressure is unstable, the structure is complex, and the machining difficulty is large are solved. The valve comprises a valve body, an oil inlet, an oil return port, a working oil port, a communicating oil duct and a valve rod. A hydraulic lock one-way valve; the hydraulic lock one-way valve comprises a one-way valve core and a first spring cavity; the first containing cavity is formed in the valve body, and the first spring cavity is communicated with the first containing cavity; the control valve is inserted into the first containing cavity, and the control valve is provided with a first position for installation and a second position for opening the control valve so that the pressure oil in the first spring cavity can be conveniently connected with the oil return opening through the first containing cavity. The hydraulic lock can be reliably controlled through the control valve, the structure is simple, production and machining are convenient, the oil passing capacity is high, meanwhile, it is guaranteed that the working oil port is excellent in locking capacity through the hydraulic lock one-way valve, the structure is reliable, and the service life is long.

Description

Technical Field

[0001] This utility model relates to a control system for agricultural machinery, specifically to an electronically controlled falling multi-way valve for tractors. Background Technology

[0002] Agricultural machinery refers to various machines used in crop cultivation and animal husbandry, as well as in the initial processing and handling of agricultural and livestock products. Agricultural machinery includes agricultural power machinery, farmland construction machinery, soil tillage machinery, planting and fertilization machinery, plant protection machinery, farmland irrigation and drainage machinery, crop harvesting machinery, agricultural product processing machinery, livestock machinery, and agricultural transportation machinery. Many agricultural machines require high sealing performance; for example, the lifting cylinder of a tractor needs high pressure holding performance. Poor pressure holding performance will result in inconsistent plowing depths during plowing, affecting the plowing effect. When moving between sites, if the plow cannot be supported for an extended period, site relocation becomes impossible. However, existing agricultural machinery suffers from practical problems such as oil leakage, inability to lock, unreliable pressure holding after lifting the implement, complex structure, and high manufacturing difficulty. Utility Model Content

[0003] To address the problems of unstable pressure, complex structure, and difficult processing of pressurized oil in existing agricultural machinery, this utility model provides an electronically controlled falling multi-way valve for tractors.

[0004] The technical solution of this utility model is: an electronically controlled tractor multi-way valve, comprising a valve body, wherein the valve body is provided with an oil inlet, an oil return outlet, a working oil inlet, and a connecting oil passage, and further comprising:

[0005] A hydraulic lock check valve is located on a connecting oil passage. The hydraulic lock check valve includes a check valve core and a first spring chamber. The check valve core has a first position that blocks the connecting oil passage and a second position that opens. The working oil port is connected to the first spring chamber through the connecting oil passage.

[0006] A valve stem is disposed in the valve body and slides in cooperation with the valve body. The valve stem has a first position that connects the oil inlet to the working oil port through a hydraulic lock check valve, a second position that is in the middle position, and a third position that connects the connecting oil passage to the return oil port.

[0007] The first cavity is located on the valve body, and the first spring cavity is connected to the first cavity;

[0008] A control valve is inserted into the first cavity. The control valve has a first position during installation and a second position that allows the pressure oil in the first spring cavity to connect to the return port through the first cavity.

[0009] As a further improvement of this utility model, it also includes a connecting pipe, which is disposed in the valve body and is used to connect the first spring cavity and the first plenum.

[0010] As a further improvement of this utility model, the outer diameter of the connecting tube near the first cavity is larger than the outer diameter near the first spring cavity.

[0011] As a further improvement of this utility model, it also includes a screw plug, which is disposed on the valve body. The screw plug, the one-way valve core and the valve body cooperate with each other to form the first spring cavity.

[0012] As a further improvement of this utility model, a first elastic element is provided in the first spring cavity. One end of the first elastic element abuts against the screw plug, and the other end abuts against the one-way valve core and has a tendency to drive the one-way valve core to its first position.

[0013] As a further improvement of this utility model, it also includes a connecting hole, which is provided on the one-way valve core, and the working oil port is connected to the first spring cavity through the connecting oil passage and the connecting hole.

[0014] As a further improvement of this utility model, it also includes at least one damping element, which is detachably connected to the one-way valve core and is disposed in the connecting hole of the one-way valve core.

[0015] As a further improvement of this utility model, the control valve includes a control housing and a control valve core. The control housing is inserted into the first cavity and has an oil drain hole. When the control valve core slides horizontally relative to the control housing and is in its second position, the pressure oil in the first spring cavity is connected to the return oil port through the oil drain hole on the control housing.

[0016] As a further improvement of this utility model, the control valve is a solenoid valve.

[0017] As a further improvement of this utility model, the control valve is a directional valve.

[0018] The beneficial effects of this invention are that by setting up a hydraulic lock check valve and a control valve, the hydraulic lock check valve can open in the forward direction when the control valve is in the first position, realizing the hydraulic lock function, that is, realizing the reverse locking of hydraulic oil, preventing leakage, and ensuring that agricultural machinery can maintain pressure during transfer and operation, thereby ensuring constant product pressure and good performance. Changes in the position of the control valve can reliably unlock the hydraulic lock, facilitating oil return and retraction. This invention achieves reliable control of the hydraulic lock through the control valve, has a simple structure, is easy to manufacture and process, has strong oil flow capacity, and at the same time, the hydraulic lock check valve ensures excellent locking capability at the working oil port, resulting in a reliable structure and long service life. Attached Figure Description

[0019] AppendixFigure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Appendix Figure 2 For the appendix Figure 1 A magnified structural diagram of point I in the middle.

[0021] Appendix Figure 3 This is a cross-sectional view of the control valve in an embodiment of the present invention.

[0022] Appendix Figure 4 This is a schematic diagram of the hydraulic principle of the control valve in an embodiment of this utility model.

[0023] In the diagram, 1. Valve body; 11. Oil inlet; 12. Oil return port; 13. Working oil port; 14. Connecting oil passage; 15. First cavity; 2. Hydraulic lock check valve; 21. Check valve core; 22. First spring cavity; 23. Plug; 24. First elastic element; 25. Connecting hole; 26. Damping element; 3. Valve stem; 4. Control valve; 41. Control housing; 42. Control valve core; 43. Oil drain hole; 5. Connecting pipe. Detailed Implementation

[0024] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0025] Depend on Figure 1 Combination Figure 2-4 As shown, an electronically controlled tractor multi-way valve includes a valve body 1, which has an oil inlet 11, an oil return port 12, a working oil port 13, and a connecting oil passage 14. It also includes:

[0026] Hydraulic lock check valve 2; disposed on connecting oil passage 14; the hydraulic lock check valve 2 includes a check valve core 21 and a first spring cavity 22, the check valve core 21 has a first position blocking the connecting oil passage 14 and a second position opening; the working oil port 13 is connected to the first spring cavity 22 through the connecting oil passage 14.

[0027] The valve stem 3 is located inside the valve body 1 and slides in cooperation with the valve body 1. The valve stem 3 has a first position that connects the oil inlet 11 to the working oil port 13 through the hydraulic lock check valve 2, a second position in the middle position, and a third position that connects the connecting oil passage 14 to the return oil port 12.

[0028] The first cavity 15 is provided on the valve body 1, and the first spring cavity 22 is connected to the first cavity 15;

[0029] Control valve 4 is inserted into the first cavity 15. The control valve 4 has a first position during installation and a second position that allows the pressure oil in the first spring cavity 22 to connect to the return port 12 through the first cavity 15. The beneficial effects of this invention are that by setting up a hydraulic lock check valve and a control valve, when the control valve is in the first position, the hydraulic lock check valve can open in the forward direction, realizing the hydraulic lock function, that is, realizing reverse locking of hydraulic oil, preventing leakage, and ensuring pressure maintenance during the transfer and operation of agricultural machinery, thereby maintaining constant product pressure and achieving good results. Changes in the position of the control valve can reliably unlock the hydraulic lock, facilitating the return oil flow. This invention can reliably control the hydraulic lock through the control valve, has a simple structure, is easy to manufacture and process, has strong oil flow capacity, and simultaneously ensures excellent locking capability at the working oil port through the hydraulic lock check valve, resulting in a reliable structure and long service life. In practice, the valve body typically includes a first oil port and a second oil port; the first oil port is for oil inlet, and the second oil port is for oil return. Generally, the first oil port can be used as the lifting oil port (connected to the rodless chamber of the cylinder for cylinder lifting, allowing the boom to be raised), and the second oil port can be used as the lowering oil port (connected to the rod chamber of the cylinder for cylinder lowering, allowing the boom to be lowered). The hydraulic lock check valve of this utility model is mainly located at the first oil port (i.e., the working oil port in this utility model).

[0030] This utility model also includes a connecting pipe 5, disposed inside the valve body 1, for connecting the first spring cavity 22 and the first receptacle 15. Specifically, the outer diameter of the connecting pipe 5 near the first receptacle 15 is larger than the outer diameter near the first spring cavity 22. This results in minimal modification to the overall structure of the valve body, allows the connecting pipe to connect the first spring cavity and the first receptacle, and facilitates easy assembly and disassembly of the connecting pipe, making the structure simple.

[0031] This utility model also includes a screw plug 23 disposed on the valve body 1. The screw plug 23, the one-way valve core 21, and the valve body 1 cooperate to form the first spring cavity 22. A first elastic element 24 is provided within the first spring cavity 22. One end of the first elastic element 24 abuts against the screw plug 23, and the other end abuts against the one-way valve core 21, exhibiting a tendency to drive the one-way valve core 21 towards its first position. This structure reduces the need for a valve sleeve, facilitates reliable positioning of the one-way valve core, and simplifies the placement of the first elastic element, thereby enabling the one-way valve core to approach its first position through the first elastic element (spring).

[0032] This invention also includes a connecting hole 25 disposed on the one-way valve core 21. The working oil port 13 is connected to the first spring cavity 22 through the connecting oil passage 14 and the connecting hole 25. Specifically, it also includes at least one damping element 26, which is detachably connected to the one-way valve core 21 and is disposed within the connecting hole 25 of the one-way valve core 21. This invention provides two damping elements with different damping hole sizes, ensuring that pressurized oil can reliably and smoothly enter the first spring cavity during lifting without affecting the operation of the working oil port.

[0033] The control valve 4 includes a control housing 41 and a control valve core 42. The control housing 41 is inserted into the first cavity 15 and has an oil drain hole 43. When the control valve core 42 slides horizontally relative to the control housing 41, the control valve 4 is in its second position, allowing the pressure oil in the first spring chamber 22 to connect with the return port 12 through the oil drain hole 43 on the control housing 41. Specifically, the control valve 4 is a solenoid valve. More specifically, the control valve 4 is a directional control valve. The control valve is a solenoid directional control valve, typically a two-position, two-way solenoid directional control valve. In practice, the specific structure of the control valve can be implemented using the existing structure of a solenoid directional control valve. During use, the solenoid valve is either de-energized (or energized), and the valve core is closed, thus preventing the first spring chamber from connecting with the return port. At this time, oil can be introduced into the first oil port to perform a lifting action, or the valve can remain in the neutral position. When descent is required, the solenoid valve opens when energized (or de-energized), allowing the first spring chamber to pass through the connecting pipe, the first cavity, and the drain hole to the return port. At this time, the hydraulic lock check valve spring chamber drains oil, and oil enters through the second port to achieve the descent action of the cylinder.

[0034] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A multi-way valve for an electrically controlled tractor, comprising a valve body (1), wherein the valve body (1) is provided with an oil inlet (11), an oil return port (12), a working oil port (13), and a connecting oil passage (14), characterized in that: Also includes: A hydraulic lock check valve (2) is provided on the connecting oil passage (14); the hydraulic lock check valve (2) includes a check valve core (21) and a first spring cavity (22), the check valve core (21) has a first position blocking the connecting oil passage (14) and a second position opening; the working oil port (13) is connected to the first spring cavity (22) through the connecting oil passage (14); The valve stem (3) is located inside the valve body (1) and slides in cooperation with the valve body (1). The valve stem (3) has a first position that allows the oil inlet (11) to be connected to the working oil port (13) through the hydraulic lock check valve (2), a second position in the middle position, and a third position that allows the connecting oil passage (14) to be connected to the return oil port (12). The first cavity (15) is provided on the valve body (1), and the first spring cavity (22) is connected to the first cavity (15); The control valve (4) is inserted into the first cavity (15). The control valve (4) has a first position when installed and a second position that allows the pressure oil in the first spring cavity (22) to be connected to the return port (12) through the first cavity (15).

2. The electrically controlled falling tractor multi-way valve according to claim 1, characterized in that... It also includes a connecting pipe (5), which is located inside the valve body (1) and is used to connect the first spring cavity (22) and the first cavity (15).

3. The electrically controlled falling tractor multi-way valve according to claim 2, characterized in that... The outer diameter of the connecting pipe (5) near the first cavity (15) is greater than the outer diameter near the first spring cavity (22).

4. The electrically controlled falling tractor multi-way valve according to claim 1, characterized in that... It also includes a screw plug (23) disposed on the valve body (1), wherein the screw plug (23), the one-way valve core (21) and the valve body (1) cooperate with each other to form the first spring cavity (22).

5. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 4, characterized in that... The first spring cavity (22) is provided with a first elastic element (24). One end of the first elastic element (24) abuts against the screw plug (23), and the other end abuts against the one-way valve core (21) and has a tendency to drive the one-way valve core (21) to its first position.

6. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 1, characterized in that... It also includes a connecting hole (25) on the one-way valve core (21), and the working oil port (13) is connected to the first spring cavity (22) through the connecting oil passage (14) and the connecting hole (25).

7. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 6, characterized in that... It also includes at least one damping element (26), which is detachably connected to the one-way valve core (21), and the damping element (26) is disposed in the connecting hole (25) of the one-way valve core (21).

8. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 1, characterized in that... The control valve (4) includes a control housing (41) and a control valve core (42). The control housing (41) is inserted into the first cavity (15). The control housing (41) is provided with an oil drain hole (43). When the control valve core (42) slides horizontally relative to the control housing (41) so that the control valve (4) is in its second position, the pressure oil in the first spring cavity (22) is connected to the return oil port (12) through the oil drain hole (43) on the control housing (41).

9. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 1, characterized in that... The control valve (4) is a solenoid valve.

10. A multi-way valve for an electrically controlled tractor with a descent mechanism according to claim 1, characterized in that... The control valve (4) is a directional valve.

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