A hydraulic shift valve for a hydraulic system

Abstract

This invention relates to the field of shift valve technology and discloses a hydraulic shift valve for a hydraulic system, comprising a valve body, a drive assembly at the top of the valve body, and a detection assembly fixedly installed on the left side of the valve body; the drive assembly includes a motor, which is fixedly installed at the top of the valve body. This invention uses an electromagnetic control valve assembly to fully open the oil outlet connection port of all adjusting components. Then, the motor is started to drive the lead screw to rotate, causing the lead screw to move the meshing plate, connecting bar, and pressure shaft downwards, thus placing the detection chamber and the oil outlet connection port in a passable state. This forces some hydraulic oil from the detection chamber into the oil circuit, increasing the amount of hydraulic oil in the oil circuit. This increases the hydraulic oil volume and enters the fixed box, pushing the moving plate and connecting rod to the left. When the connecting rod moves to the contact point, it connects the circuit of the signal generator, indicating that there is no oil leakage or seepage, thereby improving the safety of the device by detecting its operating condition.

Description

Technical Field

[0001] This invention relates to the field of shift valve technology, and more specifically, to a hydraulic shift valve for a hydraulic system. Background Technology

[0002] Hydraulic shift valves are key components in hydraulic systems that control gear shifting. They achieve gear switching in mechanical transmission systems by regulating the on / off state, flow direction, and pressure of hydraulic oil, and are widely used in construction machinery, automotive automatic transmissions, and other equipment. They are crucial for ensuring stable power transmission in hydraulic equipment. However, in existing technologies, shift valves may experience wear and tear due to impacts, leading to oil leakage. Most shift valves cannot detect this leakage, thus reducing safety during use. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a hydraulic shift valve for hydraulic systems, which has the advantage of being able to detect oil leakage and improve safety.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic shift valve for a hydraulic system, comprising a valve body, a drive assembly being provided at the top of the valve body, and a detection assembly being fixedly installed on the left side of the valve body;

[0005] The drive assembly includes a motor, which is fixedly mounted on the top of the valve body. A lead screw is fixedly sleeved on the output end of the motor. A meshing plate is engaged on the surface of the lead screw. A connecting strip is sleeved on the rear side of the meshing plate. A pressure shaft is fixedly mounted on the bottom end of the connecting strip. A detection chamber is opened at the top of the valve body.

[0006] The detection assembly includes a fixed box, which is fixedly installed on the left end of the valve body. A movable plate is slidably connected to the inner cavity of the fixed box. A spring is fixedly installed between the left end of the movable plate and the fixed box. A signal generator is fixedly installed at the front end of the valve body. A contact plate is fixedly installed at the rear end of the signal generator. A connecting rod is fixedly installed at the rear end of the movable plate.

[0007] As a preferred embodiment of the present invention, an oil passage is provided in the middle of the valve body. The oil passage includes an oil inlet, an oil outlet, and an adjustment chamber. The oil inlet is located in the middle of the valve body. The oil inlet and the adjustment chamber are both connected to the oil outlet. The oil outlet and the adjustment chamber are both located in the middle of the valve body. The oil inlet and the oil outlet are both located above the adjustment chamber.

[0008] As a preferred embodiment of the present invention, the pressure shaft is slidably connected in the detection chamber, the detection chamber is located in front of the oil outlet, and the detection chamber is connected to the adjustment chamber.

[0009] As a preferred embodiment of the present invention, a connecting pipe is provided at the front end of the detection cavity, and a limiting component is provided at the bottom end of the connecting pipe. The limiting component includes a rubber block, which is slidably connected to the bottom end of the connecting pipe. A square rod is fixedly installed at the end of the rubber block away from the axis of the adjusting cavity.

[0010] As a preferred embodiment of the present invention, a push shaft is movably connected to the outer side of the square rod, a strip groove is provided at the top of the square rod, and a through hole is provided at the top of the push shaft.

[0011] As a preferred embodiment of the present invention, an adjustment assembly is placed in the inner cavity of the oil outlet connection port. The adjustment assembly includes a valve stem, and an installation ring, a plug, and a limiting ring are fixedly installed on the surface of the valve stem from back to front. A spring is placed on the rear side of the installation ring.

[0012] As a preferred embodiment of the present invention, a support bar is fixedly installed on the right end of the valve stem, and a sleeve is sleeved on the outside of the support bar.

[0013] As a preferred embodiment of the present invention, the front end of the valve body is provided with an electromagnetic control valve assembly, the electromagnetic control valve assembly includes an electromagnetic switching structure, and an iron core is electromagnetically connected to the middle of the electromagnetic switching structure.

[0014] As a preferred embodiment of the present invention, both the front end of the sleeve and the rear end of the iron core are provided with circular holes, and a locking pin is inserted into the circular holes.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention uses an electromagnetic control valve assembly to fully open the oil outlet connection port of all adjusting components. Then, the motor is started to drive the lead screw to rotate, causing the lead screw to move the meshing plate, connecting bar, and pressure shaft downwards, thus making the detection chamber and the oil outlet connection port in a passable state. This forces some of the hydraulic oil in the detection chamber into the oil circuit, increasing the amount of hydraulic oil in the oil circuit. This increases the amount of hydraulic oil in the oil circuit, which then enters the fixed box and pushes the moving plate and connecting rod to the left. When the connecting rod moves to the contact plate, it connects the circuit of the signal generator, indicating that there is no oil leakage or seepage. This allows for the detection of the device's operating condition and improves the safety of use.

[0017] 2. This invention controls the upward movement of the pressure shaft, allowing the gas located above the pressure shaft in the detection chamber to enter the connecting pipeline. Within the connecting pipeline, the gas pushes a rubber block closer to the valve stem, bringing it into contact with the valve stem. This applies pressure to both sides of the valve stem, locking it in place and preventing movement within the oil outlet. At this point, the fixing bolts of the electromagnetic switching structure are removed, and the electromagnetic switching structure is moved forward, causing the iron core and sleeve to move forward together until the locking pin is exposed. The locking pin is then removed from the round hole, allowing the electromagnetic switching structure and iron core to be removed separately. This allows for replacement of the electromagnetic switching structure and iron core without releasing hydraulic oil, enabling replacement while the hydraulic oil is pressurized. Furthermore, after replacement and installation, the oil circuit's gear control state remains unchanged. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the front side of the valve body of the present invention;

[0020] Figure 3 This is a schematic diagram of the connection of the structural driving components of the present invention;

[0021] Figure 4 This is a three-quarter sectional view of the valve body of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0023] Figure 6 This is a left-side view of the valve body of the present invention;

[0024] Figure 7 This is a schematic diagram showing the exploded connection of the structural adjustment component and the electromagnetic control valve component of the present invention.

[0025] In the diagram: 1. Valve body; 2. Oil circuit; 21. Oil inlet connection; 22. Oil outlet connection; 23. Adjustment chamber; 3. Drive assembly; 31. Motor; 32. Lead screw; 33. Engaging plate; 34. Connecting bar; 35. Pressure shaft; 36. Detection chamber; 4. Detection assembly; 41. Fixing box; 42. Moving plate; 43. Spring one; 44. Signal generator; 45. Connecting rod; 46. Connecting piece; 5. Connecting pipeline; 6. Limiting assembly; 61. Rubber block; 62. Push shaft; 63. Square rod; 64. Through hole; 7. Adjusting assembly; 71. Valve stem; 72. Plug; 73. Mounting ring; 74. Limiting ring; 75. Support bar; 76. Sleeve; 77. Spring two; 8. Electromagnetic control valve assembly; 81. Electromagnetic switching structure; 82. Iron core; 83. Locking pin. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, the present invention provides a hydraulic shift valve for a hydraulic system, including a valve body 1, a drive assembly 3 at the top of the valve body 1, and a detection assembly 4 fixedly installed on the left side of the valve body 1.

[0028] The drive assembly 3 includes a motor 31, which is fixedly installed on the top of the valve body 1. A lead screw 32 is fixedly sleeved on the output end of the motor 31. A meshing plate 33 meshes with the surface of the lead screw 32. A connecting strip 34 is sleeved on the rear side of the meshing plate 33. A pressure shaft 35 is fixedly installed at the bottom end of the connecting strip 34. A detection chamber 36 is opened at the top of the valve body 1.

[0029] The detection component 4 includes a fixed box 41, which is fixedly installed on the left end of the valve body 1. A movable plate 42 is slidably connected to the inner cavity of the fixed box 41. A spring 43 is fixedly installed between the left end of the movable plate 42 and the fixed box 41. A signal generator 44 is fixedly installed at the front end of the valve body 1. A contact plate 46 is fixedly installed at the rear end of the signal generator 44. A connecting rod 45 is fixedly installed at the rear end of the movable plate 42.

[0030] The electromagnetic control valve assembly 8 controls all regulating components 7 to fully open the oil outlet connection port 22. Then, the motor 31 is started to drive the lead screw 32 to rotate, causing the lead screw 32 to move the meshing plate 33, connecting bar 34 and pressure shaft 35 downward, and making the detection chamber 36 and the oil outlet connection port 22 in a pass state. This forces some of the hydraulic oil in the detection chamber 36 into the oil circuit 2, increasing the amount of hydraulic oil in the oil circuit 2. This increases the amount of hydraulic oil in the fixed box 41, pushing the moving plate 42 and the connecting rod 45 to the left. When the connecting rod 45 moves to the contact piece 46, it connects the circuit of the signal generator 44, indicating that there is no oil leakage or seepage. This allows for the detection of the device's operating condition and improves the safety of use.

[0031] The valve body 1 has an oil passage 2 in the middle. The oil passage 2 includes an oil inlet 21, an oil outlet 22, and an adjustment chamber 23. The oil inlet 21 is located in the middle of the valve body 1. Both the oil inlet 21 and the adjustment chamber 23 are connected to the oil outlet 22. Both the oil outlet 22 and the adjustment chamber 23 are located in the middle of the valve body 1. Both the oil inlet 21 and the oil outlet 22 are located above the adjustment chamber 23.

[0032] Hydraulic oil enters through the inlet port 21, and the solenoid control valve assembly 8 controls the regulating assembly 7 to switch the opening of different outlet ports 22, thereby switching different gear states and realizing gear shifting operation.

[0033] The pressure shaft 35 is slidably connected in the detection chamber 36, which is located in front of the oil outlet 22 and is connected to the adjustment chamber 23.

[0034] By setting a detection chamber 36 that can be connected to the front side of the oil outlet connection port 22, when the pressure shaft 35 in the detection chamber 36 moves down, the hydraulic oil located below the pressure shaft 35 in the detection chamber 36 will enter the adjustment chamber 23 and then enter the oil outlet connection port 22.

[0035] The detection cavity 36 has a connecting pipe 5 at its front end and a limiting component 6 at its bottom end. The limiting component 6 includes a rubber block 61, which is slidably connected to the bottom end of the connecting pipe 5. A square rod 63 is fixedly installed at the end of the rubber block 61 away from the axis of the adjustment cavity 23.

[0036] When the pressure shaft 35 moves upward, the gas in the detection chamber 36 located above the pressure shaft 35 enters the connecting pipe 5 and pushes the rubber block 61 to move closer to the adjustment component 7, so that the rubber block 61 locks the adjustment component 7 and prevents the adjustment component 7 from moving.

[0037] The square rod 63 is movably connected to a push shaft 62 on its outer side. The top of the square rod 63 is provided with a strip groove, and the top of the push shaft 62 is provided with a through hole 64.

[0038] By setting two through holes 64, the connecting pipe 5, the through holes 64, and the strip groove at the top of the square rod 63 are connected, so that the through holes 64 can slide on the square rod 63. When the gas in the connecting pipe 5 pushes the rubber block 61, it pushes the end of the push shaft 62. The contact between the push shaft 62 and the square rod 63 drives the square rod 63 to push the rubber block 61 to move. When the pressure shaft 35 moves down, the gas in the connecting pipe 5 is drawn into the pressure shaft 35. At this time, there is a negative pressure in the connecting pipe 5, which will drive the push shaft 62 to slide away from the rubber block 61, so as to ensure that the pressure shaft 35 can move down normally. When the push shaft 62 slides, the through holes 64 connect the connecting pipe 5 and the strip groove, so that the push shaft 62 and the square rod 63 can slide smoothly.

[0039] The inner cavity of the oil outlet 22 contains an adjustment component 7, which includes a valve stem 71. The surface of the valve stem 71 is fixedly mounted with an installation ring 73, a plug 72 and a limit ring 74 from back to front. A spring 77 is placed on the rear side of the installation ring 73.

[0040] The electromagnetic control valve assembly 8 controls the adjustment assembly 7 to move back and forth, so that the plug 72 leaves the bottom of the oil outlet connection 22 to open the oil outlet connection 22, and controls the plug 72 to be below the oil outlet connection 22 to close the oil outlet connection 22. The mounting ring 73 is provided to provide an installation position for the second spring 77, and the limit ring 74 is provided to isolate the hydraulic oil and prevent the hydraulic oil from contacting the electromagnetic control valve assembly 8.

[0041] Among them, a support bar 75 is fixedly installed on the right end of the valve stem 71, and a sleeve 76 is sleeved on the outside of the support bar 75.

[0042] Support bars 75 are provided to support the sleeve 76, such as... Figure 7 As shown, there is a gap between the sleeve 76 and the valve stem 71 due to the presence of the support bar 75, and the sleeve 76 can slide freely on the support bar 75.

[0043] The valve body 1 has an electromagnetic control valve assembly 8 at its front end. The electromagnetic control valve assembly 8 includes an electromagnetic switching structure 81, and an iron core 82 is electromagnetically connected to the middle of the electromagnetic switching structure 81.

[0044] The electromagnetic switching structure 81 is fixedly installed on the front side of the valve body 1 by bolts, and the iron core 82 at its tail end is inserted into the oil outlet connection port 22 for connection and control with the sleeve 76. When the electromagnetic switching structure 81 is energized, it generates a magnetic field that can control the back-and-forth movement of the iron core 82.

[0045] Both the front end of the sleeve 76 and the rear end of the iron core 82 are provided with round holes, and a locking pin 83 is inserted into the round holes.

[0046] By setting a locking pin 83 to connect the sleeve 76 and the iron core 82, when the electromagnetic switching structure 81 is removed, the iron core 82 and the sleeve 76 can be removed together from the oil outlet 22 until the locking pin 83 is exposed. Then the locking pin 83 can be removed from the round hole, and the electromagnetic switching structure 81 can be removed separately.

[0047] Working principle and usage process of this invention:

[0048] Under normal operating conditions, the electromagnetic switching structure 81 drives the iron core 82 to move backward or forward by generating or losing magnetism. When the iron core 82 moves backward, it drives the sleeve 76 to move backward. Since the front end of the sleeve 76 is in direct contact with the front end of the valve stem 71, it can drive the valve stem 71 to move backward to compress the second spring 77 and cause the plug 72 to move below the oil outlet connection 22 to close the oil outlet connection 22. When the iron core 82 moves forward, the iron core 82 pulls the sleeve 76 forward. At this time, the front end of the valve stem 71 loses the obstruction of the sleeve 76 and moves forward under the elastic action of the second spring 77, opening the oil outlet connection 22. At this time, hydraulic oil enters the oil outlet connection 22.

[0049] When a shutdown is required, the electromagnetic switching structure 81 controls the adjustment component 7 to fully open the oil outlet connection port 22 and position the plug 72 in front of the detection chamber 36. At this time, the start motor 31 drives the lead screw 32 to rotate, causing the lead screw 32 to move the meshing plate 33, connecting bar 34, and pressure shaft 35 downward. When the pressure shaft 35 moves downward, the gas in the connecting pipe 5 is drawn into the pressure shaft 35, creating a negative pressure in the connecting pipe 5. This negative pressure causes the push shaft 62 to slide away from the rubber block 61, ensuring that the pressure shaft 35 can move downward normally. When the push shaft 62 slides, the through hole 64 connects the connecting pipe 5 and the bar. The groove allows the push shaft 62 and the square rod 63 to slide smoothly. The downward movement of the pressure shaft 35 squeezes some of the hydraulic oil in the detection chamber 36 into the adjustment chamber 23. At this time, the amount of hydraulic oil in the adjustment chamber 23, the oil outlet 22 and the oil inlet 21 increases, and it will enter the fixed box 41 to push the moving plate 42 and the connecting rod 45 to the left. When the connecting rod 45 moves to the contact piece 46, it connects the circuit of the signal generator 44. Then the signal generator 44 sends out a circuit signal, which indicates that there is no oil leakage or seepage, thereby realizing the detection of the working condition of the device and improving the safety of use.

[0050] If there is oil seepage or leakage, the leaked hydraulic oil will cause the amount of hydraulic oil in the oil circuit 2 to decrease. Therefore, the connecting rod 45 will not be pushed to the contact piece 46, and the contact piece 46 will not connect the circuit in the signal generator 44, so that the signal generator 44 will not send a signal, thereby indicating that there is oil seepage or leakage.

[0051] When the electromagnetic switching structure 81 is damaged and needs to be replaced, the motor 31 controls the pressure shaft 35 to move upward, so that the gas in the detection chamber 36 located above the pressure shaft 35 enters the connecting pipe 5, and pushes the rubber block 61 to move closer to the valve stem 71 in the connecting pipe 5, so that the rubber block 61 contacts the valve stem 71, and applies pressure to the left and right sides of the valve stem 71 to lock the valve stem 71, so that the valve stem 71 cannot move in the oil outlet connection port 22;

[0052] Finally, remove the fixing bolts of the electromagnetic switching structure 81, pull the electromagnetic switching structure 81 forward to remove it, so that the iron core 82 and the sleeve 76 move forward together until the locking pin 83 is exposed. Then remove the locking pin 83 from the round hole, and the electromagnetic switching structure 81 and the iron core 82 can be removed separately. Put the iron core 82 on the new electromagnetic switching structure 81 onto the sleeve 76, and use the locking pin 83 to connect the sleeve 76 and the iron core 82. Finally, put the iron core 82 into the oil outlet connection port 22, and then fix the electromagnetic switching structure 81 back onto the valve body 1.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Hydraulic shift valve for hydraulic systems, comprising a valve body (1), characterized in that: The valve body (1) is provided with a drive assembly (3) at its top end, and a detection assembly (4) is fixedly installed on the left side of the valve body (1). The drive assembly (3) includes a motor (31), which is fixedly installed on the top of the valve body (1). A lead screw (32) is fixedly sleeved on the output end of the motor (31). A meshing plate (33) is engaged on the surface of the lead screw (32). A connecting strip (34) is sleeved on the rear side of the meshing plate (33). A pressure shaft (35) is fixedly installed at the bottom end of the connecting strip (34). A detection chamber (36) is opened at the top of the valve body (1). The detection component (4) includes a fixed box (41), which is fixedly installed on the left end of the valve body (1). A movable plate (42) is slidably connected to the inner cavity of the fixed box (41). A spring (43) is fixedly installed between the left end of the movable plate (42) and the fixed box (41). A signal generator (44) is fixedly installed at the front end of the valve body (1). A contact plate (46) is fixedly installed at the rear end of the signal generator (44). The rear end of the movable plate (42) is... A connecting rod (45) is fixedly installed at the end; the pressure shaft (35) is slidably connected in the detection chamber (36), the detection chamber (36) is located in front of the oil outlet (22), and the detection chamber (36) is connected to the adjustment chamber (23); a connecting pipe (5) is opened at the front end of the detection chamber (36), and a limiting component (6) is provided at the bottom end of the connecting pipe (5). The limiting component (6) includes a rubber block (61), and the rubber block (61) is slidably connected to the connecting pipe (5). At the bottom end of the rubber block (61), a square rod (63) is fixedly installed at the end away from the axis of the regulating cavity (23); an regulating assembly (7) is placed in the inner cavity of the oil outlet (22), the regulating assembly (7) includes a valve stem (71), and an installation ring (73), a plug (72) and a limiting ring (74) are fixedly installed on the surface of the valve stem (71) from back to front, and a spring (77) is placed on the rear side of the installation ring (73); an oil outlet is opened in the middle of the valve body (1). The oil circuit (2) includes an oil inlet (21), an oil outlet (22), and an adjustment chamber (23). The oil inlet (21) is located in the middle of the valve body (1). The oil inlet (21) and the adjustment chamber (23) are both connected to the oil outlet (22). The oil outlet (22) and the adjustment chamber (23) are both located in the middle of the valve body (1). The oil inlet (21) and the oil outlet (22) are both located above the adjustment chamber (23).

2. The hydraulic shuttle valve for use in a hydraulic system according to claim 1, characterized in that: The outer side of the square rod (63) is movably connected to a push shaft (62), the top end of the square rod (63) is provided with a strip groove, and the top end of the push shaft (62) is provided with a through hole (64).

3. A hydraulic shift valve for a hydraulic system according to claim 1, characterized in that: A support bar (75) is fixedly installed on the right end of the valve stem (71), and a sleeve (76) is sleeved on the outside of the support bar (75).

4. A hydraulic shift valve for a hydraulic system according to claim 3, characterized in that: The valve body (1) is provided with an electromagnetic control valve assembly (8) at the front end. The electromagnetic control valve assembly (8) includes an electromagnetic switching structure (81), and an iron core (82) is electromagnetically connected to the middle of the electromagnetic switching structure (81).

5. A hydraulic shift valve for a hydraulic system according to claim 4, characterized in that: The front end of the sleeve (76) and the rear end of the iron core (82) are both provided with round holes, and a locking pin (83) is inserted into the round hole.

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