A combined hydraulic valve with anti-liquid accumulation function

Abstract

When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior of the hydraulic cylinder and sealing load chamber, and irritate said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, and irritates said control button, and under the effect of the compression spring, rubbish spillage place, and other factors influence the controllable flow of fuel.

Description

Technical Field

[0001] The present invention relates to the technical field of combined hydraulic valves, and in particular to a combined hydraulic valve with a liquid accumulation prevention function. Background Art

[0002] Hydraulic valves are key control components in hydraulic systems. They regulate and control the pressure, flow, and direction of the fluid flowing through the system to operate actuators such as hydraulic cylinders or motors. In complex hydraulic circuits, hydraulic valves play a role similar to switches, transformers, and resistors in electronic circuits, ensuring efficient, safe, and flexible operation of the system. The basic operating principle of hydraulic valves is based on Pascal's principle, which states that for an incompressible fluid in a closed container, a pressure change in any part of the fluid is transmitted equally to all other parts. By changing the position or shape of the valve core, the hydraulic valve can exert resistance on the hydraulic fluid flowing through it, thereby achieving control. The movement of these valve cores can be triggered by various methods, including manual operation, mechanical drive, electromagnetic force, or hydraulic pressure.

[0003] Current hydraulic systems require pressure relief after use. This operation is intended to ensure safety, prevent accidental activation, and reduce potential leakage risks. As the hydraulic oil flows back to the reservoir, it often carries with it various residues, including wear particles, moisture, oxidation products, and external contaminants. These accumulated impurities are more likely to accumulate on the inner wall of the hydraulic valve due to precipitation. As the oxidized acid value increases, this will corrode the valve body material over time. Corrosion not only weakens the structural strength of the hydraulic valve, but also makes the valve more prone to adsorption and accumulation of dirt due to its unevenness. This vicious cycle exacerbates the tendency for clogging inside the valve body. Clogged hydraulic valves can seriously affect the system's operating efficiency and precise control capabilities, increase energy consumption, and may cause safety issues. How to invent a combined hydraulic valve with an anti-liquid accumulation function to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0004] In order to remedy the above deficiencies, the present invention provides a combined hydraulic valve with an anti-liquid accumulation function, which aims to prevent the problem of corrosion of the inner wall and accelerated clogging caused by residues in the hydraulic oil adhering to the hydraulic valve.

[0005] The present invention is achieved in that:

[0006] The present invention provides a combined hydraulic valve with a function of preventing fluid accumulation, comprising a reversing valve body, the top of the reversing valve body is fixedly connected to a relief valve body, the bottom of the reversing valve body is fixedly connected to a hydraulic cylinder, both sides of the reversing valve body are fixedly connected to a solenoid valve, a first limit plate is fixedly connected to the interior of the hydraulic cylinder, a piston is provided inside the hydraulic cylinder, a piston ring is sleeved on the outer wall of the piston, the piston is slidably arranged with the inner wall of the hydraulic cylinder through the piston ring, a telescopic rod is fixedly connected to the side wall of the piston, and a second limit plate is fixedly connected to the interior of the hydraulic cylinder. The inner wall of the hydraulic cylinder is embedded with multiple oil seals, and a protective cover is provided on one side of the multiple oil seals. It also includes: a reversing mechanism, which is arranged inside the reversing valve body, and the reversing mechanism controls the extension and retraction of the telescopic rod by converting the oil circuit; a cleaning mechanism, which is arranged inside the reversing valve body, and the cleaning mechanism is used to clean the inner wall of the reversing valve body to prevent liquid accumulation on the inner wall of the reversing valve body; an overflow mechanism, which is located inside the overflow valve body, and the overflow mechanism can prevent the hydraulic cylinder from being damaged due to excessive pressure; a detection mechanism, which is located at the end of the hydraulic cylinder, and the detection mechanism prevents oil leakage caused by deformation of the oil seal after deformation.

[0007] Preferably, the first limit plate is close to the tail end of the hydraulic cylinder, and the second limit plate is close to the telescopic end of the hydraulic cylinder. The first limit plate and the second limit plate are both provided with oil through holes. The protective cover is connected to the telescopic end of the hydraulic cylinder by a threaded connection. One side of the protective cover is arranged to abut against the oil seal. A first oil pipe and a second oil pipe are arranged above the hydraulic cylinder. One side of the reversing valve body is connected to the tail end of the hydraulic cylinder through the first oil pipe, and the other side of the reversing valve body is connected to the telescopic end of the hydraulic cylinder. The telescopic rod is slidably arranged inside the second limit plate, and the outer side wall of the telescopic rod is slidably arranged with the inner ring of the oil seal.

[0008] Preferably, the overflow mechanism includes a T-shaped overflow chamber opened inside the overflow valve body, the top of the overflow valve body is fixedly connected to a threaded tube, the top of the threaded tube is threadedly connected to an adjusting cap, an overflow valve core is slidingly arranged inside the T-shaped overflow chamber, the top of the overflow valve core is fixedly connected to a hard spring, and the top of the hard spring is fixedly connected to the adjusting cap.

[0009] Preferably, the reversing mechanism includes a high-pressure chamber, a first reflux chamber, a second reflux chamber, and a valve core chamber opened inside the reversing valve body. The high-pressure chamber is connected to the T-shaped overflow chamber. A reversing valve core is arranged inside the valve core chamber. The reversing valve core is provided with a first valve plug, a second valve plug, and a third valve plug. The reversing valve body is provided with a first oil circuit and a second oil circuit.

[0010] Preferably, the first oil circuit is connected to a first oil pipe, and the second oil circuit is connected to a second oil pipe.

[0011] Preferably, the cleaning mechanism includes a blade shaft rotatably connected to the inside of the reversing valve body, one end of the blade shaft is located inside the first oil circuit, and the other end is located inside the second oil circuit, one end of the blade shaft is fixedly wrapped with a first blade, and the other end is wrapped with a second blade, the circular outer contour of the first blade is slidably set with the inner wall of the first oil circuit, and the circular outer contour of the second blade is slidably set with the inner wall of the second oil circuit.

[0012] Preferably, a stepper motor is fixedly connected to the bottom of the reversing valve body, a chain belt is provided on the output shaft of the stepper motor, and the output shaft of the stepper motor is connected to the blade shaft through a chain belt transmission.

[0013] Preferably, the detection mechanism includes a transmission shaft fixedly connected to the output shaft of the stepper motor, the outer wall of the hydraulic cylinder is fixedly connected to the shaft support, the transmission shaft is rotatably arranged inside the shaft support, the end fixed sleeve of the transmission shaft is provided with a transmission gear, the outer wall of the hydraulic cylinder is rotatably connected to an annular ring, a ring gear is provided inside the annular ring, and the ring gear is meshed with the transmission gear.

[0014] Preferably, the side wall of the annular ring is fixedly connected to a support rod, a push spring and two tension springs are fixedly connected to the inside of the support rod, the support rod is elastically connected to a detection rod through the push spring, the detection rod is slidably arranged inside the support rod, and the ends of the two tension springs are fixedly connected to metal rods.

[0015] Preferably, the end of the detection rod is arranged in an arc shape, the arc end of the detection rod is slidably arranged with the oil seal, and the two metal rods are arranged in a non-contact manner with the detection rod.

[0016] The beneficial effects of the present invention are as follows: after the work is completed and the hydraulic system is depressurized, the output shaft of the stepper motor rotates, driving the blade shaft, the first blade, and the second blade to rotate, thereby cleaning the residues attached to the inner walls of the first oil passage and the second oil passage, keeping the oil passage inside the reversing valve body clean, and preventing the accumulation of residues precipitated in the hydraulic oil in the oil passage of the reversing valve body, which would cause oil passage corrosion and accelerated blockage.

[0017] When the output shaft of the stepper motor rotates, it drives the transmission shaft and transmission gear to rotate, drives the ring gear and annular ring to rotate, and drives the annular ring, support rod and detection rod to perform circular motion. The detection rod detects the deformation of the oil seal to prevent the deformation of the oil seal from causing oil leakage due to severe deformation, improves the smoothness of work, and prevents the occurrence of work stoppage due to oil seal leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a combined hydraulic valve with a liquid accumulation prevention function provided by an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of a hydraulic cylinder of a combined hydraulic valve with a liquid accumulation prevention function provided by an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of a relief valve body of a combined hydraulic valve with a liquid accumulation prevention function provided by an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the internal structure of a combined hydraulic valve reversing valve body with a liquid accumulation prevention function provided by an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the position of a transmission gear of a combined hydraulic valve with a liquid accumulation prevention function provided by an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of a combined hydraulic valve detection mechanism with a liquid accumulation prevention function provided by an embodiment of the present invention.

[0026] Figure: 1, reversing valve body; 2, relief valve body; 3, hydraulic cylinder; 4, solenoid valve; 5, first limit plate; 6, piston; 7, piston ring; 8, telescopic rod; 9, second limit plate; 10, oil seal; 11, protective cover; 12, first oil pipe; 13, second oil pipe; 14, threaded pipe; 15, adjusting cap; 16, hard spring; 17, relief valve core; 18, T-shaped relief chamber; 19, first return chamber; 20, high-pressure chamber; 21, second return chamber; 22, valve core Cavity; 23. Reversing valve core; 24. First valve plug; 25. Second valve plug; 26. Third valve plug; 27. First oil circuit; 271. Second oil circuit; 28. Blade shaft; 29. ​​Second blade; 30. First blade; 31. Stepper motor; 32. Chain belt; 33. Drive shaft; 34. Shaft support; 35. Ring gear; 36. Drive gear; 37. Ring; 38. Support rod; 39. Detection rod; 40. Metal rod; 41. Push spring; 42. Tension spring. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] Example 1, refer to Figure 1-Figure 5 A combined hydraulic valve with a function of preventing fluid accumulation includes a reversing valve body 1, a relief valve body 2 is fixedly connected to the top of the reversing valve body 1, a hydraulic cylinder 3 is fixedly connected to the bottom of the reversing valve body 1, and a solenoid valve 4 is fixedly connected to both sides of the reversing valve body 1. A first limit plate 5 is fixedly connected to the interior of the hydraulic cylinder 3, a piston 6 is provided inside the hydraulic cylinder 3, a piston ring 7 is sleeved on the outer wall of the piston 6, and the piston 6 is slidably arranged with the inner wall of the hydraulic cylinder 3 through the piston ring 7, a telescopic rod 8 is fixedly connected to the side wall of the piston 6, a second limit plate 9 is fixedly connected to the interior of the hydraulic cylinder 3, a plurality of oil seals 10 are embedded in the inner wall of the hydraulic cylinder 3, and a protective cover 11 is provided on one side of the plurality of oil seals 10, and further includes:

[0029] The reversing mechanism is arranged inside the reversing valve body 1, and the reversing mechanism controls the extension and retraction of the telescopic rod 8 by converting the oil circuit; the overflow mechanism is located inside the overflow valve body 2, and the overflow mechanism can prevent the hydraulic cylinder 3 from being damaged by excessive pressure;

[0030] The first limit plate 5 is close to the tail end of the hydraulic cylinder 3, and the second limit plate 9 is close to the telescopic end of the hydraulic cylinder 3. Oil passage holes are opened inside the first limit plate 5 and the second limit plate 9. The protective cover 11 is connected to the telescopic end of the hydraulic cylinder 3 through a thread. One side of the protective cover 11 is set in conflict with the oil seal 10. A first oil pipe 12 and a second oil pipe 13 are set above the hydraulic cylinder 3. One side of the reversing valve body 1 is connected with the tail end of the hydraulic cylinder 3 through the first oil pipe 12, and the other side of the reversing valve body 1 is connected with the telescopic end of the hydraulic cylinder 3. The telescopic rod 8 is slidably arranged inside the second limit plate 9, and the outer wall of the telescopic rod 8 is slidably arranged with the inner ring of the oil seal 10;

[0031] The overflow mechanism includes a T-shaped overflow chamber 18 provided inside the overflow valve body 2, a threaded tube 14 is fixedly connected to the top of the overflow valve body 2, an adjusting cap 15 is threadedly connected to the top of the threaded tube 14, an overflow valve core 17 is slidably provided inside the T-shaped overflow chamber 18, a hard spring 16 is fixedly connected to the top of the overflow valve core 17, and the top of the hard spring 16 is fixedly connected to the adjusting cap 15; the reversing mechanism includes a high-pressure chamber 20, a first return chamber 19, a second return chamber 21, and a valve core chamber 22 provided inside the reversing valve body 1, the high-pressure chamber 20 is communicated with the T-shaped overflow chamber 18, a reversing valve core 23 is provided inside the valve core chamber 22, a first valve plug 24, a second valve plug 25, and a third valve plug 26 are provided on the reversing valve core 23, a first oil circuit 27 and a second oil circuit 271 are provided inside the reversing valve body 1; the first oil circuit 27 is communicated with the first oil pipe 12, and the second oil circuit 271 is communicated with the second oil pipe 13;

[0032] It should be noted that: the solenoid valve 4 on the side of the first oil pipe 12 is started, and the reversing valve core 23 moves in the direction of the first oil pipe 12 under the action of the electromagnetic force, and the hydraulic oil enters the reversing valve body 1 from the high-pressure chamber 20, is pressed into the second oil path 271 through the valve core chamber 22 between the first valve plug 24 and the second valve plug 25, and enters the hydraulic cylinder 3 through the second oil pipe 13. As the pressure increases, the hydraulic oil gradually increases between the piston 6 and the oil seal 10, and the hydraulic oil pushes the piston 6 to move in the direction of the first limit plate 5. After reaching the first limit plate 5, the excess hydraulic oil returns to the oil tank through the relief valve body 2, realizing the contraction process of the telescopic rod 8. If the telescopic rod 8 is to be extended, the solenoid valve 4 on the side of the second oil pipe 13 is started, so that the solenoid valve 4 drives the reversing valve core 23 to move in the direction of the second oil pipe 13. The principle is the same as the contraction of the telescopic rod 8, thereby realizing the extension of the telescopic rod 8.

[0033] A cleaning mechanism is provided inside the reversing valve body 1. The cleaning mechanism is used to clean the inner wall of the reversing valve body 1 to prevent liquid accumulation on the inner wall of the reversing valve body 1. The cleaning mechanism includes a vane shaft 28 rotatably connected to the inside of the reversing valve body 1. One end of the vane shaft 28 is located inside the first oil passage 27, and the other end is located inside the second oil passage 271. A first vane 30 is fixedly wound around one end of the vane shaft 28, and a second vane 29 is wound around the other end. The circular outer contour of the first vane 30 is slidably arranged with the inner wall of the first oil passage 27, and the circular outer contour of the second vane 29 is slidably arranged with the inner wall of the second oil passage 271. A stepping motor 31 is fixedly connected to the bottom of the reversing valve body 1. A chain belt 32 is provided on the output shaft of the stepping motor 31. The output shaft of the stepping motor 31 is transmission-connected to the vane shaft 28 via the chain belt 32.

[0034] In this embodiment, after the work is completed and the hydraulic system is depressurized, the hydraulic oil loses pressure and flows back to the oil tank. Part of the hydraulic oil will adhere to the inner wall of the reversing valve body 1, and the residue therein will precipitate and adhere with the hydraulic oil. The stepper motor 31 is started, and the output shaft of the stepper motor 31 rotates, driving the blade shaft 28 to rotate through the chain belt 32, driving the first blade 30 and the second blade 29 to rotate, and cleaning the residue attached to the inner walls of the first oil path 27 and the second oil path 271, so as to keep the oil path inside the reversing valve body 1 clean, and prevent the residue precipitated in the hydraulic oil from accumulating in the oil path of the reversing valve body 1, causing the oil path corrosion and accelerated blockage.

[0035] Furthermore, when the first blade 30 and the second blade 29 rotate, the circular outer contour of the first and second oil passages 27 and 271 fit together to form a surface, and the first and second oil passages 27 and 271 are continuously rotated to scrape and clean the residues attached to the inner walls of the first and second oil passages 27 and 271. The scraping method of rotating multiple spiral blades is more effective than the single-piece scraping and cleaning method in the prior art, thereby better keeping the oil passage inside the reversing valve body 1 clean.

[0036] Example 2, refer to Figure 6-Figure 7 The detection mechanism includes a transmission shaft 33 fixedly connected to the output shaft of the stepping motor 31, the outer wall of the hydraulic cylinder 3 is fixedly connected to the shaft support 34, the transmission shaft 33 is rotatably arranged inside the shaft support 34, the end of the transmission shaft 33 is fixedly sleeved with a transmission gear 36, the outer wall of the hydraulic cylinder 3 is rotatably connected to an annular ring 37, the annular ring 37 is provided with a ring gear 35, and the ring gear 35 is meshed with the transmission gear 36;

[0037] A support rod 38 is fixedly connected to the side wall of the annular ring 37. A push spring 41 and two tension springs 42 are fixedly connected to the interior of the support rod 38. The support rod 38 is elastically connected to a detection rod 39 via the push spring 41. The detection rod 39 is slidably arranged inside the support rod 38. The ends of the two tension springs 42 are fixedly connected to metal rods 40. The end of the detection rod 39 is arranged in an arc shape. The arc end of the detection rod 39 is slidably arranged with the oil seal 10. The two metal rods 40 are arranged in a non-contact manner with the detection rod 39.

[0038] In this embodiment, the detection rod 39 detects the deformation of the oil seal 10 to prevent the oil seal 10 from leaking due to severe deformation.

[0039] Furthermore, while the output shaft of the stepper motor 31 rotates, driving the blades to rotate and clean the residue inside the oil circuit, the output shaft of the stepper motor 31 drives the transmission shaft 33 to rotate, driving the transmission gear 36 to rotate, and the transmission gear 36 drives the annular ring 37 to rotate through the ring gear 35 meshing therewith. The rotation of the annular ring 37 drives the support rod 38 to perform a circular motion around the telescopic rod 8, driving the detection rod 39 to perform a circular motion, so that the detection rod 39 can perform a circular motion. If the oil seal 10 is deformed due to aging or wear under the action of pressure, the pressure of the hydraulic oil in the hydraulic cylinder 3 exerts an outward pushing pressure on the oil seal 10, causing the originally fixed oil seal 10 to protrude outward due to long-term pressure. The protruding position squeezes the detection rod 39, pushing the detection rod 39 to contact the two metal rods 40, so that a conductive path is formed between the two metal rods 40, and feedback is provided on the deformation of the oil seal 10, thereby realizing the function of detecting the deformation of the oil seal 10;

[0040] It should be noted that the detection rod 39 and the metal rod 40 are both connected to the power supply via a wire. When the detection rod 39 and the metal rod 40 come into contact, a conductive path is formed, at which point a feedback signal is generated for feedback.

[0041] It should be noted that the arc-shaped end portion of the detection rod 39 can make the detection rod 39 rotate more smoothly around the oil seal 10, thereby avoiding the situation where the detection rod 39 is stuck due to excessive contact area with the raised oil seal 10.

[0042] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A combined hydraulic valve with a liquid accumulation prevention function, comprising a reversing valve body (1), the top of the reversing valve body (1) being fixedly connected to a relief valve body (2), and the bottom of the reversing valve body (1) being fixedly connected to a hydraulic cylinder (3), characterized in that: Both sides of the reversing valve body (1) are fixedly connected to a solenoid valve (4), the interior of the hydraulic cylinder (3) is fixedly connected to a first limit plate (5), a piston (6) is provided inside the hydraulic cylinder (3), an outer wall of the piston (6) is sleeved with a piston ring (7), the piston (6) is slidably arranged with the inner wall of the hydraulic cylinder (3) through the piston ring (7), a telescopic rod (8) is fixedly connected to the side wall of the piston (6), the interior of the hydraulic cylinder (3) is fixedly connected to a second limit plate (9), a plurality of oil seals (10) are embedded on the inner wall of the hydraulic cylinder (3), and a protective cover (11) is provided on one side of the plurality of oil seals (10), and further comprising: A reversing mechanism is arranged inside the reversing valve body (1), and the reversing mechanism controls the extension and retraction of the telescopic rod (8) by switching the oil circuit; A cleaning mechanism is provided inside the reversing valve body (1), and is used to clean the inner wall of the reversing valve body (1) to prevent liquid from accumulating on the inner wall of the reversing valve body (1); An overflow mechanism is located inside the overflow valve body (2), and the overflow mechanism can prevent the hydraulic cylinder (3) from being damaged due to excessive pressure; A detection mechanism is located at the end of the hydraulic cylinder (3), and the detection mechanism prevents oil leakage caused by deformation of the oil seal (10). A first oil circuit (27) and a second oil circuit (271) are provided inside the reversing valve body (1). The first oil circuit (27) is connected to the first oil pipe (12), and the second oil circuit (271) is connected to the second oil pipe (13). The cleaning mechanism includes a vane shaft (28) rotatably connected to the inside of the reversing valve body (1), one end of the vane shaft (28) is located inside the first oil circuit (27), and the other end is located inside the second oil circuit (271), one end of the vane shaft (28) is fixedly wound with a first vane (30), and the other end is wound with a second vane (29), the circular outer contour of the first vane (30) is slidably arranged with the inner wall of the first oil circuit (27), and the circular outer contour of the second vane (29) is slidably arranged with the inner wall of the second oil circuit (271), A stepper motor (31) is fixedly connected to the bottom of the reversing valve body (1), a chain belt (32) is provided on the output shaft of the stepper motor (31), and the output shaft of the stepper motor (31) is connected to the blade shaft (28) through the chain belt (32). The detection mechanism includes a transmission shaft (33) fixedly connected to the output shaft of the stepping motor (31); the outer wall of the hydraulic cylinder (3) is fixedly connected to a shaft support (34); the transmission shaft (33) is rotatably arranged inside the shaft support (34); the end of the transmission shaft (33) is fixedly sleeved with a transmission gear (36); the outer wall of the hydraulic cylinder (3) is rotatably connected to an annular ring (37); a ring gear (35) is arranged inside the annular ring (37); the ring gear (35) is meshed with the transmission gear (36); The side wall of the annular ring (37) is fixedly connected to a support rod (38), the interior of the support rod (38) is fixedly connected to a push spring (41) and two tension springs (42), the support rod (38) is elastically connected to a detection rod (39) via the push spring (41), the detection rod (39) is slidably arranged inside the support rod (38), and the ends of the two tension springs (42) are fixedly connected to a metal rod (40). The end of the detection rod (39) is arranged in an arc shape, the arc end of the detection rod (39) is arranged to slide with the oil seal (10), and the two metal rods (40) are arranged to be non-contact with the detection rod (39).

2. A combined hydraulic valve with anti-liquid accumulation function according to claim 1, characterized in that: The first limit plate (5) is close to the tail end of the hydraulic cylinder (3), and the second limit plate (9) is close to the telescopic end of the hydraulic cylinder (3). The first limit plate (5) and the second limit plate (9) are both provided with oil passage holes inside. The protective cover (11) is connected to the telescopic end of the hydraulic cylinder (3) through a thread. One side of the protective cover (11) is arranged to abut against the oil seal (10). A first oil pipe (12) and a second oil pipe (13) are arranged above the hydraulic cylinder (3). One side of the reversing valve body (1) is connected to the tail end of the hydraulic cylinder (3) through the first oil pipe (12), and the other side of the reversing valve body (1) is connected to the telescopic end of the hydraulic cylinder (3). The telescopic rod (8) is slidably arranged inside the second limit plate (9), and the outer wall of the telescopic rod (8) is slidably arranged with the inner ring of the oil seal (10).

3. A combined hydraulic valve with anti-liquid accumulation function according to claim 2, characterized in that: The overflow mechanism comprises a T-shaped overflow chamber (18) provided inside the overflow valve body (2); a threaded tube (14) is fixedly connected to the top of the overflow valve body (2); an adjusting cap (15) is connected to the top of the threaded tube (14) via a thread; an overflow valve core (17) is slidably provided inside the T-shaped overflow chamber (18); a hard spring (16) is fixedly connected to the top of the overflow valve core (17); and the top of the hard spring (16) is fixedly connected to the adjusting cap (15).

4. A combined hydraulic valve with anti-liquid accumulation function according to claim 3, characterized in that: The reversing mechanism comprises a high-pressure chamber (20), a first reflux chamber (19), a second reflux chamber (21), and a valve core chamber (22) which are provided inside the reversing valve body (1); the high-pressure chamber (20) is connected to the T-shaped overflow chamber (18); a reversing valve core (23) is provided inside the valve core chamber (22); and a first valve plug (24), a second valve plug (25), and a third valve plug (26) are provided on the reversing valve core (23).

Images