Hydraulic pin penetrating device with locking function

Abstract

The hydraulic pin penetrating device with the locking function comprises a sleeve and a double-acting hydraulic cylinder which are connected with each other, a pin shaft penetrates through the sleeve, the pin shaft is connected with a piston rod of the double-acting hydraulic cylinder through a connecting pin shaft, and the pin shaft is driven to stretch out and draw back synchronously through telescopic movement of the piston rod; an integrated valve block is arranged on the double-acting hydraulic cylinder and matched with a locking structure arranged in the double-acting hydraulic cylinder, and locking of the piston rod is completed. The locking mechanism is adopted to prevent the oil cylinder from retracting or stretching out in the non-working state, and the risk that the pin shaft connecting structure fails due to the fact that the pin shaft connected with the hydraulic oil cylinder accidentally retreats or penetrates in is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of petroleum machinery equipment, and particularly relates to a hydraulic pin-passing device with a locking function. Background Art

[0002] When installing a pin on a pin connection structure, the traditional method is manual installation. Since the clearance between the general pin hole and the pin is small, and due to reasons such as the alignment error and deformation of the pin hole and the pin, it is often difficult to insert or withdraw the pin. It is necessary to strike the pin forcefully to insert or withdraw the pin into or out of the pin hole. This method has a large manual labor intensity and low efficiency. Especially when the pin connection structure is at a high position, the danger is relatively large. During the use of the pin connection structure, the pin is likely to withdraw from the pin hole due to various reasons. Without a reliable locking device, if the pin withdrawal problem occurs, it will cause the failure of the pin connection structure and result in safety accidents. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydraulic pin-passing device with a locking function to replace manual pin connection operations, and adopt a locking mechanism to prevent the piston rod of the oil cylinder from retracting or extending in a non-working state, avoiding the risk of failure of the pin connection structure caused by the accidental withdrawal or insertion of the pin connected to the hydraulic oil cylinder.

[0004] The technical solution adopted by the present invention is that it includes a sleeve and a double-acting hydraulic cylinder connected to each other. A pin is inserted into the sleeve, and the pin is connected to the piston rod of the double-acting hydraulic cylinder through a connecting pin. The piston rod drives the pin to perform synchronous telescopic movement through telescopic movement.

[0005] An integrated valve block is arranged on the double-acting hydraulic cylinder, and the integrated valve block cooperates with a locking structure arranged inside the double-acting hydraulic cylinder to complete the locking of the piston rod.

[0006] The present invention is further characterized in that

[0007] The locking structure includes a cylinder barrel, the cylinder barrel is connected to the sleeve, a guide sleeve and a disc spring seat are nested inside the cylinder barrel, the guide sleeve is sleeved on the piston rod, one end of the disc spring seat abuts against the guide sleeve, and the other end abuts against the cylinder barrel;

[0008] A clamping block, a spacer ring and a disc spring are also sleeved on the outside of the piston rod. The clamping block, the spacer ring and the disc spring are located inside the disc spring seat. The guide sleeve, the spacer ring and the clamping block form a control chamber inside the disc spring seat. A control oil passage communicating with the control chamber is opened on the cylinder barrel, and the control oil passage is communicated with the integrated valve block through a pipeline. The integrated valve block controls the oil to enter the control chamber through the control oil passage to control the clamping block to lock the piston rod.

[0009] The cross-section of the clamping block is fan-shaped, and a plurality of clamping blocks are enclosed into a cylinder shape and sleeved on the piston rod. A partition frame is arranged between adjacent clamping blocks;

[0010] Wedge rings are respectively arranged at positions near both ends on the outer side of the clamping block. When the two wedge rings slide towards each other relative to the outer side surface of the clamping block, the frictional force between the clamping block and the piston rod increases.

[0011] The spacer ring is arranged between the disc spring and the wedge ring. One end of the disc spring abuts against the disc spring seat, and the other end abuts against the spacer ring.

[0012] Breather holes are radially opened on the cylinder barrel and the disc spring seat at positions corresponding to the disc spring. A breather valve is arranged at the position of the cylinder barrel corresponding to the breather hole.

[0013] A shuttle valve for controlling the oil flow direction is arranged on the integrated valve block.

[0014] A locking pin hole is vertically opened radially on the sleeve. A safety locking pin is inserted into the locking pin hole. The safety locking pin passes through the locking pin hole to block the movement of the pin shaft, thereby fixing the position of the pin shaft.

[0015] A displacement sensor for detecting the telescopic state of the pin shaft is arranged on the double-acting hydraulic cylinder.

[0016] A displacement sensor for detecting the telescopic state of the pin shaft is arranged on the pin shaft.

[0017] A connecting flange for connecting with the cylinder barrel is arranged on the sleeve.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) The hydraulic pin-piercing device with a locking function of the present invention squeezes the clamping block through the wedge ring, increasing the frictional force between the clamping block and the piston rod, thereby completing the locking of the piston rod to prevent the piston rod from moving due to reasons such as the residual pressure in the rod and rodless chambers of the double-acting hydraulic cylinder. The wedge ring realizes the increase or decrease of the pressing force based on the oil pressure in the control chamber, achieving the control of the locking function through hydraulics. After the pin shaft extends or retracts to the specified position, the safety locking pin is used for further locking, further improving the reliability of the locking function and reducing the possibility of other risks caused by the accidental penetration or withdrawal of the pin shaft.

[0020] (2) The hydraulic pin-piercing device with a locking function of the present invention is equipped with a displacement sensor on the hydraulic cylinder or the pin shaft to detect the extension or retraction state of the pin shaft, so as to timely cut off the liquid supply of port A or port B of the integrated valve group and timely lock the pin shaft, further improving the locking effect of the device of the present invention. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the hydraulic pin-piercing device with a locking function of the present invention;

[0022] Figure 2 is Figure 1 an enlarged structural diagram of I in

[0023] Figure 3It is a schematic diagram of the hydraulic pin-piercing device with a locking function of the present invention when it is fully retracted and locked;

[0024] Figure 4 It is a schematic diagram of the hydraulic pin-piercing device with a locking function of the present invention when it is fully extended and locked;

[0025] Figure 5 Is Figure 1 The sectional view from perspective A in

[0026] Figure 6 Is Figure 3 The sectional view from perspective B in

[0027] Figure 7 It is a schematic diagram of the principle structure of the hydraulic pin-piercing device with a locking function of the present invention;

[0028] Figure 8 It is a schematic diagram of the structure of the hydraulic pin-piercing device with a locking function of the present invention equipped with a displacement sensor.

[0029] In the figure, 1. Pin shaft, 2. Connecting pin shaft, 3. Piston rod, 4. Sleeve, 5. Connecting flange, 6. Double-acting hydraulic cylinder, 7. Integrated valve block, 8. Guide sleeve, 9. Cylinder barrel, 10. Wedge ring, 11. Locking block, 12. Spacer ring, 13. Disc spring, 14. Disc spring seat, 15. Breather valve, 16. Control oil passage, 17. Safety locking pin, 18. Locking pin hole, 19. Partition frame, 20. Control chamber, 21. Shuttle valve, 22. Displacement sensor. Specific implementation mode

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation modes.

[0031] Embodiment 1

[0032] As Figure 1 shown, the hydraulic pin-piercing device with a locking function of the present invention includes a sleeve 4 and a double-acting hydraulic cylinder 6 that are connected to each other. A pin shaft 1 is inserted into the sleeve 4. The pin shaft 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin shaft 2. The pin shaft 1 is driven to perform synchronous telescopic movement by the telescopic movement of the piston rod 3;

[0033] An integrated valve block 7 is provided on the double-acting hydraulic cylinder 6, and a shuttle valve 21 for controlling the oil flow direction is provided on the integrated valve block 7. The integrated valve block 7 cooperates with the locking structure provided inside the double-acting hydraulic cylinder 6 to complete the locking of the piston rod 3, thereby preventing the pin shaft connected to the piston rod from accidentally extending or retracting.

[0034] As Figure 6As shown in the figure, in order to further improve the locking effect on the pin shaft 1, a locking pin hole 18 is vertically opened in the sleeve 4 in the radial direction. A safety locking pin 17 is inserted into the locking pin hole 18, and the safety locking pin 17 passes through the locking pin hole 18 to block the movement of the pin shaft 1, thereby fixing the position of the pin shaft 1.

[0035] Embodiment 2

[0036] The hydraulic pin-passing device with a locking function of the present invention includes a sleeve 4 and a double-acting hydraulic cylinder 6 that are connected to each other. A pin shaft 1 is inserted into the sleeve 4, and the pin shaft 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin 2. The pin shaft 1 synchronously expands and contracts by the telescopic movement of the piston rod 3.

[0037] An integrated valve block 7 is provided on the double-acting hydraulic cylinder 6, and a shuttle valve 21 for controlling the oil flow direction is provided on the integrated valve block 7. The integrated valve block 7 cooperates with a locking structure arranged inside the double-acting hydraulic cylinder 6 to complete the locking of the piston rod 3.

[0038] As Figure 2 shown, the locking structure includes a cylinder barrel 9, the cylinder barrel 9 is connected to the sleeve 4, a guide sleeve 8 and a disc spring seat 14 are nested inside the cylinder barrel 9, the guide sleeve 8 is sleeved on the piston rod 3, one end of the disc spring seat 14 abuts against the guide sleeve 8, and the other end abuts against the cylinder barrel 9;

[0039] A clamping block 11, a spacer ring 12 and a disc spring 13 are also sleeved on the outside of the piston rod 3. The clamping block 11, the spacer ring 12 and the disc spring 13 are located inside the disc spring seat 14. The guide sleeve 8, the clamping block 11 and the spacer ring 12 form a control chamber 20 inside the disc spring seat 14. As Figure 5 shown, the cross-section of the clamping block 11 is fan-shaped, and a plurality of clamping blocks 11 are enclosed in a cylindrical shape and sleeved on the piston rod 3. A partition frame 19 is arranged between adjacent clamping blocks 11. Wedge-shaped rings 10 are respectively arranged at positions close to both ends on the outside of the clamping block 11. When the two wedge-shaped rings 10 slide towards each other on the outer side surface of the clamping block 11, a normal pressure is formed on the clamping block 11, pressing the clamping block 11 towards the piston rod 3. The pressure between the clamping block 11 and the piston rod 3 increases, which will cause the friction force between the clamping block 11 and the piston rod 3 to increase. Eventually, the friction force between the two is greater than the thrust or pulling force received by the piston rod 3, realizing the locking of the piston rod. The spacer ring 12 is arranged between the disc spring 13 and the wedge-shaped ring 10. One end of the disc spring 13 abuts against the disc spring seat 14, and the other end abuts against the spacer ring 12.

[0040] A control oil passage 16 communicating with the control chamber 20 is opened on the cylinder barrel 9. The control oil passage 16 is connected to the integrated valve block 7 through a pipeline. The integrated valve block 7 controls the oil to enter the control chamber 20 through the control oil passage 16 to control the clamping block 11 to lock the piston rod 3.

[0041] That is, when the piston rod 3 needs to be locked, the disc spring 13 is in the extended state, and a lateral force is applied to the wedge ring 10 through the spacer ring 12. The wedge ring 10 slides relative to the latch 11, squeezing the latch 11 to form a downward pressure radially applied to the latch 11, thereby increasing the frictional force between the latch 11 and the piston rod 3 and preventing the piston rod 3 from moving due to factors such as the residual pressure in the rod and rodless chambers of the double-acting hydraulic cylinder 6. When the locking state needs to be released, hydraulic oil is injected into the control chamber 20 through the control oil passage 16. The pressure in the control chamber 20 increases, the spacer ring 12 moves and compresses the disc spring 13. The wedge ring 10 no longer receives the lateral force applied by the spacer ring 12 and stops squeezing the latch 11. When the hydraulic pressure in the rod chamber of the double-acting hydraulic cylinder 6 is greater than the frictional force between the latch 11 and the piston rod 3, the piston rod 3 can perform telescopic movement.

[0042] As can be seen from the above, when the pressure of the hydraulic oil in the control chamber 20 increases to a certain value, the piston rod 3 can move. This value is the locking force of the locking mechanism, and the magnitude of the locking force mainly depends on the initial compression amount and type of the disc spring 13.

[0043] In order to further improve the locking effect on the pin shaft 1, a locking pin hole 18 is vertically opened in the sleeve 4 in the radial direction. A safety locking pin 17 is inserted into the locking pin hole 18. The safety locking pin 17 passes through the locking pin hole 18 to block the movement of the pin shaft 1 and complete the position fixing of the pin shaft 1.

[0044] Embodiment 3

[0045] The hydraulic pin-passing device with a locking function of the present invention includes a sleeve 4 and a double-acting hydraulic cylinder 6 connected to each other. A pin shaft 1 is inserted into the sleeve 4. The pin shaft 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin 2. The piston rod 3 drives the pin shaft 1 to perform synchronous telescopic movement through telescopic movement. A connecting flange 5 for connecting to the cylinder barrel 9 is provided on the sleeve 4.

[0046] An integrated valve block 7 is provided on the double-acting hydraulic cylinder 6. A shuttle valve 21 for controlling the oil flow direction is provided on the integrated valve block 7. The integrated valve block 7 cooperates with the locking structure arranged inside the double-acting hydraulic cylinder 6 to complete the locking and release of the piston rod 3.

[0047] As Figure 7 shown, the integrated valve block 7 has two oil supply ports A and B. By supplying oil to port A or port B, the telescopic movement of the piston rod 3 on the double-acting hydraulic cylinder 6 is realized. That is, when oil is supplied to port A, it is actually injecting oil into the rodless chamber of the double-acting hydraulic cylinder 6 to realize the extension of the piston rod 3. Supplying oil to port B is injecting oil into the rod chamber to realize the retraction of the piston rod 3.

[0048] The locking structure includes a cylinder barrel 9, which is connected to a sleeve 4. A guide sleeve 8 and a disc spring seat 14 are nested inside the cylinder barrel 9. The guide sleeve 8 is sleeved on a piston rod 3. One end of the disc spring seat 14 abuts against the guide sleeve 8, and the other end abuts against the cylinder barrel 9;

[0049] On the outer side of the piston rod 3, a clamping block 11, a spacer ring 12, and a disc spring 13 are also sleeved. The clamping block 11, the spacer ring 12, and the disc spring 13 are located inside the disc spring seat 14. The guide sleeve 8, the clamping block 11, and the spacer ring 12 form a control chamber 20 inside the disc spring seat 14. As Figure 5 shown, the cross-section of the clamping block 11 is fan-shaped. A number of clamping blocks 11 are enclosed in a cylindrical shape and sleeved on the piston rod 3. A partition frame 19 is arranged between adjacent clamping blocks 11. Wedge-shaped rings 10 are respectively arranged at positions near both ends on the outer side of the clamping block 11. When the two wedge-shaped rings 10 slide towards each other on the outer side surface of the clamping block 11, the frictional force between the clamping block 11 and the piston rod 3 increases. The spacer ring 12 is arranged between the disc spring 13 and the wedge-shaped ring 10. One end of the disc spring 13 abuts against the disc spring seat 14, and the other end abuts against the spacer ring 12.

[0050] The cylinder barrel 9 and the disc spring seat 14 are radially provided with breathing holes at positions corresponding to the disc spring 13. A breathing valve 15 is arranged at a position on the cylinder barrel 9 corresponding to the breathing holes. It can ensure that the atmosphere is always communicated during the compression and release process of the installed disc spring 13, preventing a closed chamber from being formed between the spacer ring 12 and the disc spring seat 14, thereby affecting the compression force of the disc spring 13.

[0051] A control oil passage 16 communicating with the control chamber 20 is opened on the cylinder barrel 9. The control oil passage 16 is connected to an integrated valve block 7 through a pipeline. The control oil of the integrated valve block 7 enters the control chamber 20 through the control oil passage 16 to control the clamping block 11 to lock the piston rod 3.

[0052] A lock pin hole 18 is vertically opened radially on the sleeve 4. A safety lock pin 17 is inserted into the lock pin hole 18. The safety lock pin 17 passes through the lock pin hole 18 to block the movement of the pin shaft 1, completing the position fixation of the pin shaft 1.

[0053] As Figure 8 shown, in order to accurately obtain the telescopic state of the pin shaft 1, a displacement sensor 22 can be arranged on the double-acting hydraulic cylinder 6 or the pin shaft 1.

[0054] When the present invention works, it is mainly divided into two working processes: the pin shaft 1 retracts and the pin shaft 1 extends. The specific working processes are as follows:

[0055] The working process of the pin shaft retraction is as follows,

[0056] At the start of operation, hydraulic oil is supplied to port B of the integrated valve block 7 until the pressure reaches point b. The oil then splits into two paths. One path enters the rod chamber of the double-acting hydraulic cylinder 6, driving the piston rod 3 of the double-acting hydraulic cylinder 6 to retract. The other path leads to the inlet of the shuttle valve 21. After flowing out of the shuttle valve 21, it is directed to the control oil passage 16. Since the control oil passage 16 is connected to the control chamber 20, the hydraulic oil finally flows into the control chamber 20. After the hydraulic oil flows into the control chamber 20, it pushes the spacer 12 to move to the right, starting to compress the disc spring 13, thereby balancing the lateral force exerted by the disc spring 13 on the wedge ring 10. As the lateral force on the wedge ring 10 by the disc spring 13 gradually decreases due to the increase in hydraulic oil pressure, the clamping force of the wedge ring 10 on the locking block 11 gradually decreases. The clamping force on the locking block 11 decreases, thereby reducing the frictional force of the locking block 11 on the piston rod 3.

[0057] At the initial stage of oil supply, under the action of the hydraulic oil in the rod chamber of the double-acting hydraulic cylinder 6, the piston rod 3 has a tendency to retract. However, since the force it receives for retraction is less than the frictional force exerted on it by the locking block 11, the piston rod 3 is locked and cannot move. But when the pressure of the hydraulic oil increases to a certain value, the force for the piston rod 3 to retract is greater than the frictional force exerted on it by the locking block 11, and the piston rod 3 can then retract.

[0058] During the retraction process of the piston rod 3, the pin shaft 1 connected to it also retracts into the sleeve 4. When the pin shaft 1 retracts to the in-place position, the oil supply to port B of the integrated valve block 7 stops, and the hydraulic oil pressure in the control chamber 20 is released to zero. The compressed disc spring 13 rebounds, and the spacer 12 moves to the left under the restoring force of the disc spring 13, thereby pushing the wedge ring 10 to slide upward along the inclined surface that slidably mates with the locking block 11, increasing the clamping force on the locking block 11, that is, continuously increasing the frictional force of the locking block 11 on the piston rod 3, preventing the piston rod 3 from moving due to factors such as the residual pressure in the rod and rodless chambers of the double-acting hydraulic cylinder 6, thus realizing the locking function of the retracted state of the pin shaft. The fully retracted and locked state of the pin shaft is as Figure 3 shown.

[0059] The process of the pin shaft extending for operation is as follows.

[0060] At the start of operation, hydraulic oil is supplied to port A of the integrated valve block 7 until the pressure reaches point a. The oil then splits into two paths. One path enters the rodless chamber of the double-acting hydraulic cylinder 6, driving the piston rod 3 of the double-acting hydraulic cylinder 6 to extend outward. The other path leads to the inlet of the shuttle valve 21. After flowing out of the shuttle valve 21, it is directed to the control oil passage 16. Since the control oil passage 16 is connected to the control chamber 20, the hydraulic oil finally flows into the control chamber 20. After the hydraulic oil flows into the control chamber 20, it pushes the spacer 12 to move to the right, starting to compress the disc spring 13, thereby balancing the lateral force exerted by the disc spring 13 on the wedge ring 10. As the lateral force on the wedge ring 10 by the disc spring 13 gradually decreases due to the increase in hydraulic oil pressure, the clamping force of the wedge ring 10 on the locking block 11 gradually decreases. The clamping force on the locking block 11 decreases, thereby reducing the frictional force of the locking block 11 on the piston rod 3.

[0061] At the initial stage of oil supply, under the action of the hydraulic oil in the rodless cavity of the double-acting hydraulic cylinder 6, the piston rod 3 has a tendency to extend outwards. However, since the force acting on it to extend outwards is less than the frictional force exerted on it by the clamping block 11, the piston rod 3 cannot move. But when the pressure of the hydraulic oil increases to a certain value, the force for the piston rod 3 to extend outwards is greater than the frictional force exerted on it by the clamping block 11, and then the piston rod 3 can extend.

[0062] During the extension process of the piston rod 3, the pin shaft 1 connected to it also extends outwards from the sleeve 4. When the pin shaft 1 extends in place, the oil supply to port A of the integrated valve block 7 is stopped, and the hydraulic oil pressure in the control chamber 20 is relieved to zero. The compressed disc spring 13 rebounds, and the spacer 12 moves leftwards under the action of the restoring force of the disc spring 13, thereby pushing the wedge ring 10 to slide upwards along the inclined plane that slidably mates with the clamping block 11, increasing the pressing force on the clamping block 11, that is, the frictional force of the clamping block 11 on the piston rod 3 continuously increases, preventing the piston rod 3 from moving due to factors such as the residual pressure in the rod and rodless cavities of the double-acting hydraulic cylinder 6, thus realizing the locking function of the extended state of the pin shaft. The state where the pin shaft is fully extended and locked is as Figure 4 shown.

[0063] In the above two processes, after the pin shaft 1 extends and retracts in place, a safety locking pin 17 can be inserted into the locking pin hole 18 to realize the limit locking of the pin shaft 1, serving as a safety backup for the locking structure integrated in the double-acting hydraulic cylinder 6.

Claims

1. A hydraulic pin-piercing device with a locking function, comprising a sleeve (4) and a double-acting hydraulic cylinder (6) connected to each other. Characterized in that, a pin shaft (1) is inserted into the sleeve (4), the pin shaft (1) is connected to the piston rod (3) of the double-acting hydraulic cylinder (6) through a connecting pin shaft (2), and the pin shaft (1) is driven to expand and contract synchronously by the telescopic movement of the piston rod (3); an integrated valve block (7) is arranged on the double-acting hydraulic cylinder (6), and the integrated valve block (7) cooperates with a locking structure arranged inside the double-acting hydraulic cylinder (6) to complete the locking of the piston rod (3).

2. The hydraulic pin-piercing device with a locking function according to claim 1, Characterized in that, the locking structure includes a cylinder barrel (9), the cylinder barrel (9) is connected to the sleeve (4), a guide sleeve (8) and a disc spring seat (14) are nested inside the cylinder barrel (9), the guide sleeve (8) is sleeved on the piston rod (3), one end of the disc spring seat (14) abuts against the guide sleeve (8), and the other end abuts against the cylinder barrel (9); a clamping block (11), a spacer ring (12) and a disc spring (13) are also sleeved on the outside of the piston rod (3), the clamping block (11), the spacer ring (12) and the disc spring (13) are located inside the disc spring seat (14), a control chamber (20) is formed inside the disc spring seat (14) by the guide sleeve (8), the spacer ring (12) and the clamping block (11), a control oil passage (16) communicating with the control chamber (20) is opened on the cylinder barrel (9), the control oil passage (16) is communicated with the integrated valve block (7) through a pipeline, the control oil of the integrated valve block (7) enters the control chamber (20) through the control oil passage (16) to control the clamping block (11) to lock the piston rod (3).

3. The hydraulic pin-piercing device with a locking function according to claim 2, Characterized in that, the cross section of the clamping block (11) is fan-shaped, and a plurality of clamping blocks (11) are enclosed into a cylinder shape and sleeved on the piston rod (3), and a partition frame (19) is arranged between adjacent clamping blocks (11); wedge-shaped rings (10) are respectively arranged at positions close to both ends on the outside of the clamping block (11), and when the two wedge-shaped rings (10) slide towards each other relative to the outer side surface of the clamping block (11), the friction force between the clamping block (11) and the piston rod (3) increases.

4. The hydraulic pin-piercing device with a locking function according to claim 3, Characterized in that, the spacer ring (12) is arranged between the disc spring (13) and the wedge-shaped ring (10), one end of the disc spring (13) abuts against the disc spring seat (14), and the other end abuts against the spacer ring (12).

5. The hydraulic pin-piercing device with a locking function according to claim 2, Characterized in that, breathing holes are radially opened on the cylinder barrel (9) and the disc spring seat (14) at positions opposite to the disc spring (13), and a breathing valve (15) is arranged at a position on the cylinder barrel (9) opposite to the breathing holes.

6. The hydraulic pin-piercing device with a locking function according to claim 1, Characterized in that, a shuttle valve (21) for controlling the oil flow direction is arranged on the integrated valve block (7).

7. The hydraulic pin-piercing device with a locking function according to claim 1, It is characterized in that a locking pin hole (18) is vertically opened in the sleeve (4) in the radial direction, a safety locking pin (17) is inserted into the locking pin hole (18), and the safety locking pin (17) passes through the locking pin hole (18) to block the movement of the pin shaft (1), thereby fixing the position of the pin shaft (1).

8. The hydraulic pin-passing device with a locking function according to any one of claims 1 to 7 It is characterized in that a displacement sensor (22) for detecting the telescopic state of the pin shaft (1) is arranged on the double-acting hydraulic cylinder (6).

9. The hydraulic pin-passing device with a locking function according to any one of claims 1 to 7 It is characterized in that a displacement sensor (22) for detecting the telescopic state of the pin shaft (1) is arranged on the pin shaft (1).

10. The hydraulic pin-passing device with a locking function according to claim 1 It is characterized in that a connecting flange (5) for connecting with the cylinder barrel (9) is arranged on the sleeve (4).

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