Electro-hydraulic control hydraulic valve with emergency reversing function

Abstract

The electro-hydraulic control hydraulic valve with the emergency reversing function comprises a main valve body, two electric control end covers, a hydraulic control end cover and an electric proportional pressure reducing valve, the two electric control end covers are symmetrically arranged on the two sides of the main valve body, working ports are symmetrically formed in the top end of the main valve body, valve elements are arranged in the main valve body and the electric control end covers, and the electric proportional pressure reducing valve is arranged in the main valve body and the hydraulic control end covers. The two ends of the valve element are arranged in a pilot control cavity of the electric-hydraulic control end cover, the hydraulic control end cover is installed on the electric control end cover and communicated with the pilot control cavity of the electric control end cover, the electric control end cover and the hydraulic control end cover are each provided with a pilot oil port and communicated with the pilot control cavity in the electric control end cover through an oil way, and the electric proportional pressure reducing valve is arranged on the electric control end cover. The electric proportional pressure reducing valve is used for controlling the on-off of an oil duct between a pilot oil port of the electric control end cover and a pilot control cavity of the electric control end cover; electromagnetic control over lifting, neutral position, descending, floating and other actions of the movable arm of the loading machine can be achieved, and the device has the advantages of being compact in structure, good in filtering performance, high in reliability and the like.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic proportional multi-way control valve technology, specifically to an electro-hydraulic control hydraulic valve with emergency reversing function. Background Technology

[0002] Skid steer loaders are widely used in situations with limited space, uneven terrain, and frequent switching of work devices. The quality of the boom control system directly determines the overall performance of the machine. Hydraulic steering offers advantages such as rapid response and low cost, but it is susceptible to fluctuations in pilot pressure, cannot adequately handle micro-motion, requires high fluid cleanliness, and results in a poor user experience.

[0003] The existing patent, number 2023233527176, entitled "An Electro-hydraulic Proportional Multi-way Valve with Floating Position," has the following shortcomings:

[0004] 1. The electro-hydraulic proportional multi-way valve mentioned in the patent does not fully consider the complex operating conditions of the entire vehicle. The floating position does not have a clear difference in pilot pressure, which affects the micro-movement of the hydraulic cylinder and the driver's operating feel.

[0005] 2. No emergency measures were considered in case of solenoid valve failure.

[0006] 3. The issue of oil easily drawing in air during rapid cylinder operation was not considered. Utility Model Content

[0007] To address the problems existing in the prior art, this utility model provides an electro-hydraulic control valve with emergency reversing capability. This valve enables electromagnetic control of various actions of the loader boom, including lifting, neutralizing, lowering, and floating. The valve core reversing can be achieved by remotely controlling the current of the proportional pressure reducing valve to accurately control the pilot pressure acting on the valve stem. Furthermore, the pilot pressure can be controlled by adjusting the current of the proportional pressure reducing valve. Since the force-bearing area of ​​the valve core remains constant, the opening area between the valve core and the valve core hole groove can be accurately controlled, ultimately controlling the flow rate through the hydraulic valve. This valve offers advantages such as compact structure, good filtering performance, and high reliability.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an electro-hydraulic control valve with emergency reversing function, comprising: a main valve body, an electro-hydraulic control end cover, a hydraulic control end cover, and an electro-proportional pressure reducing valve. The two electro-hydraulic control end covers are symmetrically arranged on both sides of the main valve body. The top of the main valve body is symmetrically provided with working ports for connecting to the oil cylinder. The main valve body is also provided with an oil inlet and an oil outlet. The main valve body and the electro-hydraulic control end cover are provided with valve cores inside. The two ends of the valve core are arranged in the pilot control chamber of the electro-hydraulic control end cover. The hydraulic control end cover is installed on the electro-hydraulic control end cover and communicates with the pilot control chamber of the electro-hydraulic control end cover. The movement of the valve core controls the oil inlet to communicate with one of the working ports, and the movement of the valve core controls the oil outlet to communicate with the other working port.

[0009] Both the electronically controlled end cap and the hydraulically controlled end cap are equipped with pilot oil ports, which are connected to the pilot control chamber in the electronically controlled end cap through oil passages. The pilot oil ports are connected to external oil circuits, and the valve core is moved and reversed by the introduction of hydraulic oil.

[0010] The electro-proportional pressure reducing valve is installed on the electro-control end cover. The electro-proportional pressure reducing valve controls the opening and closing of the oil passage between the pilot oil port of the electro-control end cover and the pilot control chamber of the electro-control end cover.

[0011] Furthermore, the hydraulic end cap is also provided with a pilot control cavity, which is connected to the pilot control cavity on the electro-hydraulic end cap.

[0012] Furthermore, the pilot control chamber on the hydraulic end cap, the pilot control chamber on the electro-hydraulic end cap, and the valve core are located on the same straight line.

[0013] Furthermore, it also includes: a buffer oil replenishing valve, which is installed on the main valve body, and the two buffer oil replenishing valves are respectively set on the oil passage between the working oil port and the oil outlet.

[0014] Furthermore, the main valve body is also equipped with an oil return port.

[0015] Furthermore, it also includes: an overflow valve, which is installed on the valve body and is located between the oil passage of the oil inlet and the oil passage of the oil return port.

[0016] Furthermore, the two hydraulic end caps are provided with a double-layer sliding sleeve structure or a single-layer sliding sleeve structure, and each hydraulic end cap can only be provided with one set of double-layer sliding sleeve structure or single-layer sliding sleeve structure.

[0017] Furthermore, the double-layer sliding sleeve structure includes: a sub-sliding sleeve, a female sliding sleeve, a sub-spring, and a female spring. The sub-sliding sleeve is slidably installed on the sliding sleeve end of the female sliding sleeve to form a sub-female sliding sleeve. The sub-female sliding sleeve is slidably disposed in the pilot control cavity, so that the sub-sliding sleeve is fitted onto one end of the valve core, and the other end of the female sliding sleeve is abutted against the bottom of the pilot control cavity of the hydraulic control end cover. The female sliding sleeve is provided with an oil passage cavity, and an oil passage hole is provided on the section away from the sub-sliding sleeve. The oil passage hole is aligned with the pilot oil port of the hydraulic control end cover. The female spring is disposed in the female sliding sleeve and the pilot control cavity, and the sub-spring is disposed between the oil passage cavity of the female sliding sleeve and the sub-sliding sleeve.

[0018] Furthermore, the single-layer sliding sleeve structure includes: a single-layer sliding sleeve and a single-layer spring. The single-layer sliding sleeve and the single-layer spring are installed in the pilot control cavity, so that the single-layer sliding sleeve is fitted onto the end of the valve core.

[0019] Furthermore, the end of the valve core connected to the single-layer sliding sleeve is a boss structure. One end of the single-layer sliding sleeve is provided with an oil passage hole, which is aligned with the pilot oil port of the hydraulic control end cover. A movable seal is provided between the valve core and the pilot control cavity of the electric control end cover, so that the end of the boss structure of the valve core and the pilot control cavity of the electric control end cover form a common oil cavity. The end of the boss structure is provided with a T-shaped oil passage, and a one-way valve is provided in the T-shaped oil passage. The vertical oil passage in the T-shaped oil passage is directly connected to the common oil cavity. One end of the horizontal oil passage is connected to the vertical oil passage through the one-way valve, and the other end is set in the single-layer sliding sleeve.

[0020] The beneficial effects of this utility model are:

[0021] 1) The electro-hydraulic control valve with emergency reversing can realize both hydraulic and electro-hydraulic reversing modes and can realize valve core reversing. It can meet the needs of emergency use in the case of solenoid valve failure and has better safety.

[0022] 2) The left end cover of the electro-hydraulic control valve with emergency reversing adopts a double spring design, which makes the reversing pressure of different reversing positions significantly different, taking into account both the micro-movement of the cylinder and the driver's operating feel.

[0023] 3) The working port of the electro-hydraulic control valve with emergency reversing is equipped with a buffer oil replenishment valve, which makes the operation more stable and safer;

[0024] 4) In the electro-hydraulic control valve with emergency reversing, the pilot oil port enters through the filter screen damping joint, which can achieve the function of filtering and filtering the oil, so that the reversing is smooth and the solenoid valve is not prone to failure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 for Figure 1 A magnified schematic diagram of the middle section (I);

[0027] Figure 3 for Figure 1 A partially enlarged structural diagram of section II;

[0028] Figure 4 This is a schematic diagram of the principle structure;

[0029] In the diagram: 1. Main valve body; 2. Electrically controlled end cap; 3. Hydraulically controlled end cap; 31. Sub-sleeve; 32. Female sleeve; 33. Sub-spring; 34. Female spring; 35. Single-layer sleeve; 36. Single-layer spring; 4. Electro-proportional pressure reducing valve; 5. Buffer oil replenishment valve; 6. Working oil port A; 7. Working oil port B; 8. Filter screen damping joint; 9. Valve core; 91. T-type oil passage; 92. Check valve; 10. Relief valve; 11. Oil cylinder. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0032] like Figure 1-4 As shown, an electro-hydraulic control valve with emergency reversing includes: a main valve body 1, an electro-hydraulic control end cover 2, a hydraulic control end cover 3, and an electro-proportional pressure reducing valve 4. The two electro-hydraulic control end covers 2 are symmetrically arranged on both sides of the main valve body 1. The top of the main valve body 1 is symmetrically provided with working ports for connecting to the oil cylinder 11. The main valve body 1 is also provided with an oil inlet and an oil outlet. The main valve body 1 and the electro-hydraulic control end cover 2 are provided with valve cores 9 inside. The two ends of the valve core 9 are arranged in the pilot control chamber of the electro-hydraulic control end cover 3. The hydraulic control end cover 3 is installed on the electro-hydraulic control end cover 2 and communicates with the pilot control chamber of the electro-hydraulic control end cover 2. The movement of the valve core 9 controls the oil inlet to communicate with one of the working ports, and the movement of the valve core 9 controls the oil outlet to communicate with the other working port.

[0033] Both the electronically controlled end cover 2 and the hydraulically controlled end cover 3 are equipped with pilot oil ports, which are connected to the pilot control chamber in the electronically controlled end cover 2 through oil passages. The pilot oil ports are connected to external oil circuits, and the valve core 9 is moved and reversed by the introduction of hydraulic oil.

[0034] The electro-proportional pressure reducing valve 4 is installed on the electro-control end cover 2. The electro-proportional pressure reducing valve 4 controls the opening and closing of the oil passage between the pilot oil port of the electro-control end cover 2 and the pilot control chamber of the electro-control end cover 2.

[0035] The hydraulic end cap 3 is also provided with a pilot control cavity, which is connected to the pilot control cavity on the electro-hydraulic end cap 3.

[0036] The main valve body 1, the electrically controlled end cap 2, and the hydraulically controlled end cap 3 are connected together by screws or threads.

[0037] The main valve body 1 is a valve body with a floating function.

[0038] The pilot control chamber on the hydraulic end cap 3, the pilot control chamber on the electro-hydraulic end cap 3, and the valve core 9 are located on the same straight line.

[0039] The electro-hydraulic control valve with emergency reversing also includes: a buffer replenishing valve 5, which is installed on the main valve body 1, and the two buffer replenishing valves 5 are respectively set on the oil passage between the working oil port and the oil outlet.

[0040] The main valve body 1 is also provided with a return port. The electro-hydraulic control valve with emergency reversing also includes: a relief valve 10, which is installed on the valve body and is located between the oil passage of the oil inlet and the oil passage of the oil return port.

[0041] The two hydraulic end caps are provided with a double-layer sliding sleeve structure or a single-layer sliding sleeve 35 structure. Each hydraulic end cap can only be provided with one set of double-layer sliding sleeve structure or single-layer sliding sleeve 35 structure. In this example, the hydraulic end cap on the left side is provided with a double-layer sliding sleeve structure, and the hydraulic end cap on the right side is provided with a single-layer sliding sleeve 35 structure.

[0042] Among them, such as Figure 2 As shown, the double-layer sliding sleeve structure includes: a sub-sliding sleeve 31, a female sliding sleeve 32, a sub-spring 33, and a female spring 34. The sub-sliding sleeve 31 is slidably installed on the sliding end of the female sliding sleeve 32 to form a sub-sliding sleeve 32. The sub-sliding sleeve 32 is slidably disposed in the pilot control cavity, so that the sub-sliding sleeve 31 is fitted onto one end of the valve core 9. The other end of the female sliding sleeve 32 is abutted against the bottom of the pilot control cavity of the hydraulic control end cover 3. The female sliding sleeve 32 is provided with an oil passage cavity, and an oil passage hole is provided on the section away from the sub-sliding sleeve 31. The oil passage hole is aligned with the pilot oil port of the hydraulic control end cover 3. The female spring 34 is disposed in the female sliding sleeve 32 and the pilot control cavity, and the sub-spring 33 is disposed between the oil passage cavity of the female sliding sleeve 32 and the sub-sliding sleeve 31.

[0043] like Figure 3 As shown, the single-layer sliding sleeve 35 structure includes: a single-layer sliding sleeve 35 and a single-layer spring 36. The single-layer sliding sleeve 35 and the single-layer spring 36 are installed in the pilot control cavity, so that the single-layer sliding sleeve 35 is fitted onto the end of the valve core 9.

[0044] The end of the valve core 9 connected to the single-layer sliding sleeve 35 is a boss structure. One end of the single-layer sliding sleeve 35 is provided with an oil passage hole, which is aligned with the pilot oil port of the hydraulic control end cover 3. A movable seal is provided between the valve core 9 and the pilot control cavity of the electric control end cover 2, so that the end of the boss structure of the valve core 9 and the pilot control cavity of the electric control end cover 2 form a common oil cavity. The end of the boss structure is provided with a T-shaped oil passage 91. A one-way valve 92 is provided in the T-shaped oil passage 91. The vertical oil passage in the T-shaped oil passage 91 is directly connected to the common oil cavity. One end of the horizontal oil passage is connected to the vertical oil passage through the one-way valve 92, and the other end is provided in the single-layer sliding sleeve 35.

[0045] A filter damping connector 8 is installed at the pilot oil port of the electronic control end cover 2. The electronic control end cover 2 is also equipped with a detection oil port for connecting a pressure sensor to monitor the pilot pressure in real time.

[0046] An electro-hydraulic control valve with emergency reversing is installed in the high-pressure pipeline of the skid steer loader, so that the pilot oil ports on the electro-control end cover 2 and the hydraulic control end cover 3, and the oil inlet, oil outlet and oil return ports on the main valve body 1 are all connected to the high-pressure pipeline of the skid steer loader. The two working oil ports on the main valve body 1 are connected to the oil ports on the cylinder 11 respectively. The detection oil port on the electro-control end cover 2 is connected to a pressure sensor, so that the cab can monitor the pilot pressure in real time.

[0047] The electro-hydraulic control valve with emergency reversing can realize both hydraulic and electro-hydraulic reversing modes and can realize valve core 9 reversing.

[0048] When valve core 9 is in the middle position, oil cylinder 11 must not move up or down, and at this time the oil is supplied to the other actuators.

[0049] Electrically controlled commutation: such as Figure 1 As shown, when valve core 9 is in the neutral position, the right-side electro-proportional pressure reducing valve 4 is energized, and oil enters through the right-side pilot port, passing through the filter damping connector 8 and the electro-proportional pressure reducing valve 4 into the pilot control chamber. Since F=P×S, the cross-sectional area of ​​valve core 9 is constant. At this time, the pilot pressure depends on the spring force (friction is negligible). As the current increases, the oil pressure acting on the cross-section of valve core 9 continuously increases, pushing valve core 9 to switch directions. The first stroke of valve core 9 is X1. The oil inlet of the main valve body 1 is connected to the working oil port A6, entering the large chamber of the oil cylinder 11. The outlet of the main valve body 1... The oil port is connected to the working oil port B7 to unload the small chamber of the oil cylinder 11. The buffer oil replenishment valve 5 can act as a pressure limiting protection element and prevent the small chamber of the oil cylinder 11 from sucking in air due to excessive speed. Similarly, the electric control reversing principle of the left end cover is the same, so it will not be described again. As the pilot pressure increases, the second stroke of the valve core 9 is X1 + X2. At this time, the valve core 9 enters the floating position, and the working oil port A6 and the working oil port B7 are directly connected to the oil outlet of the main valve body 1. There is no pressure in either the large or small chamber of the boom cylinder 11, and the boom can float with the height of the ground, which is safer and more energy-efficient.

[0050] Hydraulic reversing: Due to the complex working conditions faced by the loader, when the electro-proportional pressure reducing valve 4 fails, all oil ports on the electronic control end cover 2 can be manually closed, and oil can be introduced from the pilot oil port of the hydraulic control end cover 3. The hydraulic control end cover 3 can be used for reversing, which can be used in an emergency.

[0051] Meanwhile, shims can be added or removed from the springs on both sides of the hydraulic control end cap 3 as needed, thereby adjusting the displacement of the valve core 9 and the pre-compression of the spring, thus changing the opening pressure of the valve core 9 during reversal, making it suitable for more working conditions and saving energy and reducing costs.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An emergency-reversing electro-hydraulic control hydraulic valve characterized by comprising: The utility model relates to a kind of electro-hydraulic proportional control valve, including: Main valve body, electric control end cover, liquid control end cover, electric proportional pressure reducing valve, two electric control end cover symmetrically set in main valve body both sides, the top of main valve body is symmetrically equipped with working port, for being connected with oil cylinder, its main valve body is equipped with oil inlet and oil outlet, the inside of main valve body, electric control end cover is equipped with valve core, wherein, valve core both ends are set in electro-hydraulic control end cover pilot control chamber, liquid control end cover is installed on electric control end cover, with the pilot control chamber of electric control end cover communication, by the movement of valve core control oil inlet and one of working port communication, by the movement of valve core control oil outlet and another working port communication; Electric control end cover, liquid control end cover are equipped with pilot oil port, and are communicated with the pilot control chamber in electric control end cover by oil channel, pilot oil port is connected with oil circuit, and is controlled by the movement of valve core by the input hydraulic oil; Electric proportional pressure reducing valve is set on electric control end cover, and the oil channel between pilot oil port of electric control end cover and pilot control chamber of electric control end cover is controlled by electric proportional pressure reducing valve.

2. The electro-hydraulic control hydraulic valve with emergency reversing according to claim 1, characterized in that, The pilot control chamber is also provided on the liquid control end cover, and the pilot control chamber on the liquid control end cover is communicated with the pilot control chamber on the electro-hydraulic control end cover.

3. An electro-hydraulic control hydraulic valve with emergency reversing according to claim 2, characterized in that, The pilot control chamber on the liquid control end cover, the pilot control chamber on the electro-hydraulic control end cover and the valve core are located on the same straight line.

4. The electro-hydraulic control hydraulic valve with emergency reversing according to claim 1, characterized in that, Further including: Buffer oil supplement valve, buffer oil supplement valve is installed on main valve body, two buffer oil supplement valves are respectively arranged on the oil channel between working oil port and oil outlet.

5. The electro-hydraulic control hydraulic valve with emergency reversing according to claim 1, characterized in that, Main valve body is further provided with a return oil port.

6. An electro-hydraulic control hydraulic valve with emergency reversing according to claim 5, characterized in that, Further including: Overflow valve, the overflow valve is installed on the valve body, and the overflow valve is arranged between the oil channel of oil inlet and the oil channel of return oil port.

7. The electro-hydraulic control hydraulic valve with emergency reversing according to claim 1, characterized in that, Two hydraulic end covers are provided with double-layer sliding sleeve structure or single-layer sliding sleeve structure, and each hydraulic end cover has and can only be provided with one set of double-layer sliding sleeve structure or single-layer sliding sleeve structure.

8. An electro-hydraulic control hydraulic valve with emergency reversing according to claim 7, characterized in that, The double-layer sliding sleeve structure includes: a sub-sleeve, a mother sleeve, a sub-spring and a mother spring, the sub-sleeve is slidably installed at the sleeve end of the mother sleeve to form a sub-mother sleeve, the sub-mother sleeve is slidably arranged in the pilot control chamber, the sub-sleeve is sleeved on one end of the valve core, the other end of the mother sleeve is top-mounted on the bottom of the pilot control chamber of the liquid control end cover, the mother sleeve is provided with an oil passing cavity, a section away from the sub-sleeve is provided with an oil passing hole, the oil passing hole is aligned with the pilot oil port of the liquid control end cover, the mother spring is arranged in the mother sleeve and the pilot control chamber, and the sub-spring is arranged between the oil passing cavity of the mother sleeve and the sub-sleeve.

9. An electro-hydraulic control hydraulic valve with emergency reversing according to claim 7, characterized in that, The single-layer sliding sleeve structure includes: a single-layer sleeve and a single-layer spring, the single-layer sleeve and the single-layer spring are installed in the pilot control chamber, and the single-layer sleeve is sleeved on the end of the valve core.

10. An electro-hydraulic control hydraulic valve with emergency reversing according to claim 9, characterized in that, The end of the valve core connected with the single-layer sleeve is in a boss structure, one end of the single-layer sleeve is provided with an oil passing hole, and the oil passing hole is aligned with the pilot oil port of the liquid control end cover, an active seal is arranged between the valve core and the pilot control chamber of the electric control end cover, so that a shared oil cavity is formed between the end of the boss structure of the valve core and the pilot control chamber of the electric control end cover, the end of the boss structure is provided with a T-shaped oil channel, a one-way valve is arranged in the T-shaped oil channel, a vertical oil channel of the T-shaped oil channel is directly communicated with the shared oil cavity, one end of a horizontal oil channel of the T-shaped oil channel is connected with the vertical oil channel through the one-way valve, and the other end of the horizontal oil channel is arranged in the single-layer sleeve.

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