Hydraulic lock

Abstract

The hydraulic lock comprises a valve body A, a flow control port A is formed in the middle of one end of the valve body A, a filtering assembly is arranged at the flow control port A and used for blocking impurities in oil, and a plurality of flow control ports B are formed in the outer side of the other end of the valve body A; a plurality of flow control ports C are formed in the outer side of one end of the valve body B, a plurality of flow control ports D are formed in the middle of the outer side of the valve body B, and an assembly cavity is formed in the middle of one end of the valve body B; the locking assembly is assembled among the valve body A, the valve body B and the filtering assembly and used for being matched with the valve body B to fasten the valve body A and the filtering assembly. The valve body A, the valve body B and the filtering assembly are connected in a combined mode and locked through the locking assembly, the overall application stability can be guaranteed, meanwhile, the flow control assembly is easier to overhaul, and the overall application convenience is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control systems, and particularly relates to a hydraulic lock. BACKGROUND

[0002] The hydraulic lock is an important component for closing the oil circuit by using the hydraulic control check valve to keep the execution element in a static state, and the core component, the bidirectional hydraulic control check valve, only allows the oil to flow in one direction when there is no pressure at the control oil port, reversely opens when the control oil pressure reaches the preset value, and keeps the locking state to prevent the load from sliding when the oil supply is stopped, and is mainly used in the heavy hydraulic system such as the outrigger of the crane and the telescopic cylinder of the tunneling machine.

[0003] At present, the valve core and other components of the hydraulic lock in the traditional technology are located inside the valve body, however, due to the one-piece structure of the valve body, the maintenance operation of the valve core is difficult due to the structure of the valve body.

[0004] Therefore, the present application provides a hydraulic lock to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a hydraulic lock to solve the above problems.

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: a hydraulic lock, comprising: a valve body A, a middle part of one end of the valve body A is provided with a flow control port A, a filter assembly is arranged at the flow control port A, the filter assembly is used for blocking impurities in the oil, and a plurality of flow control ports B are arranged on the outer side of the other end of the valve body A; a valve body B, a plurality of flow control ports C are arranged on the outer side of one end of the valve body B, a plurality of flow control ports D are arranged on the middle part of the outer side of the valve body B, and an assembly cavity is arranged on the middle part of one end of the valve body B; a locking assembly, the locking assembly is assembled between the valve body A, the valve body B and the filter assembly, and is used for fastening the valve body A and the filter assembly in cooperation with the valve body B; a flow control assembly, the flow control assembly is assembled in the interiors of the valve body A and the valve body B, and is used for controlling the oil flow direction in the interiors of the valve body A and the valve body B.

[0007] Preferably, the filter assembly comprises a filter plate, the filter plate is connected in the interior of the flow control port A in a plug-in mode, a plurality of plug holes A and a plurality of avoiding holes A are arranged on the edge of one side of the filter plate, the avoiding holes A are in communication with the corresponding plug holes A, a plurality of accommodating grooves are arranged in the interior of the filter plate, and the plurality of accommodating grooves are in communication with the plurality of avoiding holes A respectively.

[0008] Preferably, the locking assembly comprises: The locking rod has multiple insertion holes B and clearance holes B on the edge of one end of the valve body A, and the multiple clearance holes B are respectively connected to the multiple insertion holes B. The valve body A has multiple clearance grooves on the outer side of the end away from the flow control port A, and the multiple clearance grooves are respectively connected to the multiple clearance holes B. The locking rod is slidably connected inside the insertion holes B. A stop plate is fixedly connected to the outside of one end of the locking rod. The inner side of the assembly cavity is provided with multiple locking slots, and the multiple stop plates are respectively engaged with the multiple locking slots. A support cylinder is fixedly connected to the other end of a locking rod. A displacement rod is slidably connected to the end of the support cylinder away from the locking rod. A displacement plate is fixedly connected to the end of the displacement rod inside the support cylinder, and a return spring is fixedly connected between the displacement plate and the support cylinder. A stop plate is fixedly connected to the end of the displacement rod outside the support cylinder, and the stop plate is engaged with a receiving groove.

[0009] Preferably, the flow control component includes: Valve core A, valve body A has a valve chamber A and a piston chamber inside, and the valve chamber A is located between the flow control port A and the piston chamber. The valve core A is slidably connected inside the valve chamber A. A guide plate is fixedly connected inside the valve core A. A positioning ring is fixedly connected to one end of the valve core A near the flow control port A. A helical spring A is fixedly connected between the positioning ring and the guide plate. A piston body is slidably connected inside a piston chamber, and extension rods are fixedly connected to both ends of the piston body; The valve core B has a valve cavity B inside the valve body B. The valve core B is slidably connected inside the valve cavity B. A bearing block is fixedly connected inside the valve core B. A detachable sealing cover is provided at the end of the valve body B away from the flow control port C. A helical spring B is fixedly connected at the end of the sealing cover inside the valve cavity B, and one end of the helical spring B is fixedly connected to the bearing block.

[0010] Preferably, a stabilizing strip is fixedly connected inside the assembly cavity, and a stabilizing groove is provided on the outer side of the valve body A near the valve body B, and the stabilizing strip is also snapped into the stabilizing groove.

[0011] Preferably, a sealing ring is provided at the connection between the filter plate and the valve body A, and a filter screen is fixedly connected to the middle of the filter plate.

[0012] Preferably, the receiving groove is fan-shaped.

[0013] Preferably, a limiting strip is fixedly connected to the outer side of the displacement rod, a limiting groove is formed at one end of the support cylinder near the limiting strip, and the limiting strip is also slidably connected inside the limiting groove.

[0014] Preferably, a sealing plate is rotatably connected to the outer side of the displacement rod away from the support cylinder, which is used to seal the insertion hole A and the clearance hole A.

[0015] Preferably, the valve core A and valve core B are each provided with a tapered surface at their close ends, and the tapered surface has multiple through holes.

[0016] Beneficial effects This invention provides a hydraulic lock. Compared with the prior art, it has the following advantages: This hydraulic lock, through the combined connection of valve body A, valve body B and filter assembly, and locked by locking components, not only ensures the overall stability of the application, but also makes the maintenance of the flow control components easier, greatly improving the convenience of the overall application.

[0017] This hydraulic lock, through the structural cooperation of the filter assembly, can block impurities in the oil when the oil flows at the flow control port A, thus preventing impurities from entering the flow control assembly and affecting its opening and closing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a half-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the separation structure of valve body A and filter plate of the present invention; Figure 4 This is a schematic diagram of the structure of the filter component of the present invention; Figure 5 This is a schematic diagram of the structure of the insertion hole B and the clearance hole B of the present invention; Figure 6 This is a schematic diagram of the locking component of the present invention; Figure 7 This is a schematic diagram of the internal structure of the support cylinder of the present invention; Figure 8 This is a schematic diagram of the flow control component of the present invention; Figure 9 This is a schematic diagram of the internal structure of valve core A of the present invention; Figure 10 This is a schematic diagram of the internal structure of valve core B of the present invention.

[0019] In the diagram: 1. Valve body A; 2. Flow control port A; 3. Flow control port B; 4. Valve body B; 5. Flow control port C; 6. Flow control port D; 7. Assembly cavity; 8. Locking assembly; 9. Flow control assembly; 10. Filter plate; 11. Insertion hole A; 12. Clearance hole A; 13. Receiving groove; 14. Locking rod; 15. Insertion hole B; 16. Clearance hole B; 17. Clearance groove; 18. Stop plate; 19. Support cylinder; 20. Displacement rod; 21. Displacement... 21. Plate; 22. Return spring; 23. Stop plate; 24. Valve chamber A; 25. Piston chamber; 26. Valve core A; 27. Guide plate; 28. Positioning ring; 29. ​​Helical spring A; 30. Piston body; 31. Extension rod; 32. Valve chamber B; 33. Valve core B; 34. Bearing block; 35. Sealing cover; 36. Helical spring B; 37. Locking groove; 38. Limiting strip; 39. Sealing plate; 40. Stabilizing strip; 41. Stabilizing groove. Detailed Implementation

[0020] 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.

[0021] Example 1: Please see Figures 1-10 A hydraulic lock, comprising: The valve body A1 has a flow control port A2 in the middle of one end of the valve body A1. A filter assembly is installed at the flow control port A2. The filter assembly is used to block impurities in the oil. Multiple flow control ports B3 are opened on the outer side of the other end of the valve body A1. The valve body B4 has multiple flow control ports C5 on the outer side of one end of the valve body B4, multiple flow control ports D6 on the middle part of the outer side of the valve body B4, and an assembly cavity 7 on the middle part of one end of the valve body B4. Locking component 8 is assembled between valve body A1, valve body B4 and filter assembly, and is used to cooperate with valve body B4 to fasten valve body A1 and filter assembly. Flow control component 9 is assembled inside valve body A1 and valve body B4 and is used to control the flow direction of oil inside valve body A1 and valve body B4. In summary, in this embodiment, the separate assembly of valve body A1, valve body B4 and filter assembly, and the fastening between valve body A1, valve body B4 and filter assembly by means of locking component 8, make the maintenance of flow control component 9 more convenient.

[0022] Please refer to Figure 8 and Figure 9In this embodiment, a stabilizing strip 40 is fixedly connected inside the assembly cavity 7, and a stabilizing groove 41 is provided on the outer side of the valve body A1 near the valve body B4, and the stabilizing strip 40 is also snapped into the stabilizing groove 41. More specifically, both the stabilizing strip 40 and the stabilizing groove 41 are arc-shaped structures. Due to the structural characteristics of the stabilizing strip 40 and the stabilizing groove 41, when the valve body A1 is inserted into the assembly cavity 7, the deformation of the stabilizing strip 40 will compress the stabilizing strip 40. When the stabilizing strip 40 and the stabilizing groove 41 are aligned, the stabilizing strip 40 loses its compression and can be reset to cause the stabilizing strip 40 to be inserted into the stabilizing groove 41, thus performing preliminary assembly of the valve body A1 and the valve body B4. Furthermore, in order for the stabilizing strip 40 to undergo a certain degree of deformation, the material of the stabilizing strip 40 can be rubber.

[0023] Please refer to Figure 3 and Figure 4 In this embodiment, the filter assembly includes a filter plate 10, which is inserted into the interior of the flow control port A2. A plurality of insertion holes A11 and clearance holes A12 are provided on one side edge of the filter plate 10, and the clearance holes A12 are connected to the corresponding insertion holes A11. A plurality of receiving grooves 13 are provided inside the filter plate 10, and the plurality of receiving grooves 13 are respectively connected to the plurality of clearance holes A12. Please refer to Figure 3 In this embodiment, a sealing ring is provided at the connection between the filter plate 10 and the valve body A1, and a filter screen is fixedly connected to the middle of the filter plate 10. More specifically, by setting a sealing ring, after the filter plate 10 is inserted into the flow control port A2, the gap between the valve body A1 and the filter plate 10 is sealed to prevent uncontrollable oil flow. Furthermore, by setting up a filter screen, when the oil flows inside the flow control port A2, the filter plate 10 can block solid impurities in the oil, preventing impurities from entering the valve body A1 and affecting the opening and closing of the flow control component 9. Please refer to Figure 4 In this embodiment, the receiving groove 13 is fan-shaped; More specifically, the shape characteristics of the receiving groove 13 enable the stop plate 23 to enter the receiving groove 13 in a manner that allows the following displacement rod 20 to rotate, thus preventing the presence of the filter plate 10 from affecting the rotation of the stop plate 23.

[0024] Please refer to Figure 3 and Figure 5 In this embodiment, the locking component 8 includes: The locking rod 14 has multiple insertion holes B15 and clearance holes B16 on the edge of one end of the valve body A1, and the multiple clearance holes B16 are respectively connected to the multiple insertion holes B15. The valve body A1 has multiple clearance grooves 17 on the outer side of the end away from the flow control port A2, and the multiple clearance grooves 17 are respectively connected to the multiple clearance holes B16. The locking rod 14 is slidably connected to the inside of the insertion hole B15. The stop plate 18 is fixedly connected to the outer side of one end of the locking rod 14. The inner side of the assembly cavity 7 is provided with multiple locking grooves 37, and the multiple stop plates 18 are respectively engaged with the multiple locking grooves 37. The support cylinder 19 is fixedly connected to the other end of the locking rod 14. The end of the support cylinder 19 away from the locking rod 14 is slidably connected to the displacement rod 20. The end of the displacement rod 20 located inside the support cylinder 19 is fixedly connected to the displacement piece 21, and the displacement piece 21 and the support cylinder 19 are fixedly connected to the return spring 22. The end of the displacement rod 20 located outside the support cylinder 19 is fixedly connected to the stop plate 23, and the stop plate 23 is snapped into the receiving groove 13. Please refer to Figure 7 In this embodiment, a limiting strip 38 is fixedly connected to the outer side of the displacement rod 20, and a limiting groove is opened at one end of the support cylinder 19 near the limiting strip 38, and the limiting strip 38 is also slidably connected inside the limiting groove. More specifically, by setting the limit bar 38, when the position of the stop plate 23 corresponds to the receiving groove 13, the displacement rod 20 is rotated. Since the limit bar 38 is connected inside the limit groove, the locking rod 14 can rotate with the displacement rod 20. In this embodiment, the cross-sectional shape of both the limiting strip 38 and the limiting groove is rectangular. By utilizing the shape characteristics of the limiting strip 38 and the limiting groove, uncontrollable movement of the limiting strip 38 inside the limiting groove can be avoided, which greatly ensures the stability of the connection between the limiting strip 38 and the limiting groove.

[0025] Please refer to Figure 7 In this embodiment, a sealing plate 39 is rotatably connected to the outer side of the displacement rod 20 away from the support cylinder 19, which is used to seal the insertion hole A11 and the clearance hole A12. More specifically, by setting the sealing plate 39, after the locking rod 14 moves into the socket A11 and socket B15, the sealing plate 39 is rotated so that the position of the sealing plate 39 is adapted to the contour of the socket A11 and the clearance hole A12. When the sealing plate 39 moves into the socket A11 and the clearance hole A12, the socket A11 and the clearance hole A12 can be blocked by the sealing plate 39. Furthermore, a sealing gasket is provided on the outer side of the sealing plate 39. By providing the sealing gasket, the connection of the sealing plate 39 can be sealed after the sealing plate 39 is moved into the socket A11 and the clearance hole A12, so as to prevent oil from entering the socket B15 and the clearance hole B16 through the gap at the connection. The sealing gasket can be made of rubber. By utilizing the properties of rubber, the sealing effect of the gasket can be guaranteed, while also ensuring the durability of the sealing component. Please refer to Figure 7 In this embodiment, a knob is fixedly connected to the end of the displacement rod 20 away from the support cylinder 19. The knob has an internal hexagonal groove in the middle. The internal hexagonal groove allows personnel to easily rotate the displacement rod 20 with the help of a hexagonal wrench.

[0026] Example 2: Please see Figures 8-10 This embodiment provides a technical solution based on Embodiment 1: the flow control component 9 includes: The valve core A26 and the valve body A1 have a valve chamber A24 and a piston chamber 25 inside. The valve chamber A24 is located between the flow control port A2 and the piston chamber 25. The valve core A26 is slidably connected inside the valve chamber A24. A guide plate 27 is fixedly connected inside the valve core A26. A positioning ring 28 is fixedly connected to one end of the valve core A26 near the flow control port A2. A helical spring A29 is fixedly connected between the positioning ring 28 and the guide plate 27. The piston body 30 is slidably connected inside the piston chamber 25, and extension rods 31 are fixedly connected to both ends of the piston body 30. The valve core B33 and the valve body B4 have a valve cavity B32 inside. The valve core B33 is slidably connected inside the valve cavity B32. A bearing block 34 is fixedly connected inside the valve core B33. A detachable sealing cover 35 is provided at the end of the valve body B4 away from the flow control port C5. A helical spring B36 is fixedly connected at the end of the sealing cover 35 inside the valve cavity B32, and one end of the helical spring B36 is fixedly connected to the bearing block 34. Please refer to Figure 8 In this embodiment, valve core A26 and valve core B33 are both provided with a tapered surface at their close ends, and multiple through holes are provided on the tapered surface; More specifically, the presence of the conical surface allows the valve core A26 or valve core B33 to make adaptive displacements when there is oil flow inside valve chamber A24 and valve chamber B32, thanks to the contact between the oil and the conical surface. Furthermore, the structural characteristics of the conical surface make the valve chamber B32 more stable when it blocks valve chamber B32 or valve core A26 blocks valve chamber A24, thus preventing uncontrollable oil flow.

[0027] Please refer to Figure 8In this embodiment, multiple sealing grooves are provided on the outer side of the piston body 30, and a rubber ring is fixedly connected inside each sealing groove. By setting the rubber ring, the connection gap between the piston body 30 and the piston cavity 25 can be sealed, preventing uncontrollable flow of oil inside the piston cavity 25.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] Working principle: First, a piston body 30 is set inside the piston chamber 25. The end of the valve body A1 away from the flow control port A2 is aligned with the assembly chamber 7. Then, the valve body A1 is pushed to move into the assembly chamber 7, thereby realizing the initial assembly of the valve body A1 and the valve body B4. After the valve body A1 is assembled, the two extension rods 31 will be located inside the piston chamber 25 and the assembly chamber 7 respectively. Pre-connect the filter plate 10 to the flow control port A2, and make the displacement of the insertion hole A11 correspond to that of the insertion hole B15, and the position of the clearance hole A12 correspond to that of the clearance hole B16. Then, align the stop plate 18 at the locking rod 14 with the clearance hole A12, and insert the locking rod 14 through the insertion hole A11 into the interior of the insertion hole B15 until the locking rod 14 reaches the end of the insertion hole B15, while aligning the position of the stop plate 18 with that of the clearance groove 17. Press the displacement rod 20 again to make it slide under the support of the support cylinder 19. With the connection between the displacement rod 20 and the stop plate 23, the stop plate 23 can move into the insertion hole A11 and the clearance hole A12. When the stop plate 23 corresponds to the position of the receiving groove 13, rotate the displacement rod 20 to adjust the stop plate 23 towards the receiving groove 13, and at the same time adjust the stop plate 18 towards the locking groove 37. After the stop plate 23 enters the receiving groove 13 and the stop plate 18 passes through the clearance groove 17 and moves into the locking groove 37, release the press of the displacement rod 20. When the displacement rod 20 moves, the return spring 22 will deform. When the displacement rod 20 is released, the stop plate 23 can press against the receiving groove 13 under the elastic potential energy of the return spring 22, thereby realizing the quick locking between the valve body A1, the valve body B4 and the filter plate 10. Furthermore, when the flow control assembly 9 needs to be repaired or the filter plate 10 needs to be replaced, first press the displacement rod 20 to disengage the stop plate 23 from the receiving groove 13, and rotate the displacement rod 20 to make the stop plate 18 reach the inside of the clearance hole B16 and the stop plate 23 reach the inside of the clearance hole A12. Then pull the locking rod 14 out from the insertion hole B15 to unlock the valve body A1, valve body B4 and filter plate 10 at the same time. Then the components can be repaired. During the application process, the flow control ports A2 to B3 and D6 to C5 are closed. In the opposite direction, the flow control ports B3 to A2 and C5 to D6 are open. Therefore, when the pressure at flow control port B3 or C5 exceeds the load pressure at flow control ports D6 and A2, the flow control ports D6 to C5 and A2 to B3 are opened to maintain the position of the actuators connected to them.

[0030] 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.

[0031] 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. A hydraulic lock characterized by: The utility model relates to a valve body A (1) one end middle part of the valve body A (1) is equipped with the flow control mouth A (2), the flow control mouth A (2) is equipped with filter assembly, filter assembly is used for the impurity in oil, the valve body A (1) other end outside is equipped with multiple flow control mouth B (3); Valve body B (4) one end outside of valve body B (4) is equipped with multiple flow control mouth C (5), the middle part of valve body B (4) outside is equipped with multiple flow control mouth D (6), the middle part of valve body B (4) one end is equipped with assembly cavity (7); Locking assembly (8) is assembled between valve body A (1), valve body B (4) and filter assembly, is used for cooperating valve body B (4) to tighten valve body A (1) and filter assembly; Flow control assembly (9) is assembled inside valve body A (1) and valve body B (4), is used for controlling the oil flow direction inside valve body A (1) and valve body B (4). The filter assembly includes a filter plate (10), the filter plate (10) is connected to the inside of the flow control mouth A (2), the edge of one side of the filter plate (10) is provided with a plurality of insertion holes A (11) and avoidance holes A (12), and the avoidance holes A (12) are communicated with the corresponding insertion holes A (11), a plurality of accommodation grooves (13) are formed in the inside of the filter plate (10), and the plurality of accommodation grooves (13) are communicated with the plurality of avoidance holes A (12) respectively.

2. A hydraulic lock as claimed in claim 1, characterized in that: The locking assembly (8) includes:

3. A hydraulic lock as claimed in claim 2, characterized in that: A locking rod (14) is slidably connected to the inside of the insertion hole B (15), a plurality of stop clamping plates (18) are fixedly connected to the outside of one end of the locking rod (14), the inside of the assembly cavity (7) is provided with a plurality of locking grooves (37), and the plurality of stop clamping plates (18) are clampedly connected to the plurality of locking grooves (37) respectively, a supporting cylinder (19) is fixedly connected to the other end of the locking rod (14), one end of the displacement rod (20) located in the inside of the supporting cylinder (19) is fixedly connected with a displacement sheet (21), a return spring (22) is fixedly connected between the displacement sheet (21) and the supporting cylinder (19), one end of the displacement rod (20) located in the outside of the supporting cylinder (19) is fixedly connected with a stop plate (23), and the stop plate (23) is clampedly connected to the accommodation groove (13). The flow control assembly (9) includes: ​ ​ 4. A hydraulic lock as defined in claim 1, wherein: ​ Valve core A (26), the inside of the valve body A (1) is provided with valve cavity A (24) and piston cavity (25), and the valve cavity A (24) is located between the flow control port A (2) and the piston cavity (25), the valve core A (26) is slidably connected in the inside of the valve cavity A (24), the inside of the valve core A (26) is fixedly connected with the guide disc (27), one end of the valve core A (26) close to the flow control port A (2) is fixedly connected with the positioning ring (28), and the positioning ring (28) and the guide disc (27) are fixedly connected with the spiral spring A (29); Piston body (30), the piston body (30) is slidably connected in the inside of the piston cavity (25), both ends of the piston body (30) are fixedly connected with the extension rod (31); Valve core B (33), the inside of the valve body B (4) is provided with valve cavity B (32), the valve core B (33) is slidably connected in the inside of the valve cavity B (32), the inside of the valve core B (33) is fixedly connected with the bearing block (34), one end of the valve body B (4) away from the flow control port C (5) is provided with a detachable sealing cover (35), one end of the sealing cover (35) in the inside of the valve cavity B (32) is fixedly connected with the spiral spring B (36), and one end of the spiral spring B (36) is fixedly connected with the bearing block (34).

5. A hydraulic lock as defined in claim 1, wherein: The inside of the assembly cavity (7) is fixedly connected with the stability strip (40), the outside of one end of the valve body A (1) close to the valve body B (4) is provided with the stability groove (41), and the stability strip (40) is also connected with the stability groove (41).

6. A hydraulic lock as defined in claim 2, wherein: The connecting part of the filter plate (10) and the valve body A (1) is provided with a sealing ring, and the middle part of the filter plate (10) is fixedly connected with a filter screen.

7. A hydraulic lock as defined in claim 2, wherein: The containing groove (13) is a fan shape.

8. A hydraulic lock as defined in claim 3, wherein: The outside of the displacement rod (20) is fixedly connected with the limiting strip (38), one end of the supporting barrel (19) close to the limiting strip (38) is provided with a limiting groove, and the limiting strip (38) is also slidably connected in the inside of the limiting groove.

9. A hydraulic lock as defined in claim 3, wherein: The outside of one end of the displacement rod (20) away from the supporting barrel (19) is rotatably connected with the sealing plate (39) for sealing the jack A (11) and avoiding the hole A (12).

10. A hydraulic lock as defined in claim 4, wherein: The end close to each other of the valve core A (26) and the valve core B (33) is provided with a conical surface, and a plurality of through holes are formed in the conical surface.

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