Hydraulic pin locking device

Abstract

The hydraulic pin penetrating device with locking function comprises a sleeve and a double-acting hydraulic cylinder connected with each other, a pin shaft is penetrated in the sleeve, the pin shaft is connected with a piston rod of the double-acting hydraulic cylinder through a connecting pin shaft, and synchronous extension and contraction of the pin shaft are driven by extension and contraction movement of the piston rod; an integrated valve block is arranged on the double-acting hydraulic cylinder, the integrated valve block is 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 hydraulic cylinder from retracting or extending in a non-working state, and the risk of failure of the pin shaft connecting structure caused by accidental withdrawal or penetration of the pin shaft connected with the hydraulic cylinder is avoided.

Description

Technical Field

[0001] This invention belongs to the field of petroleum machinery and equipment technology, and specifically relates to a hydraulic pin-threading device with locking function. Background Technology

[0002] Traditionally, the installation of pins in a pin-connected structure involves manual installation. However, due to the small clearance between the pin hole and the pin, and errors in alignment or deformation, inserting or removing the pin is often difficult, requiring forceful striking to force it in or out. This method is labor-intensive and inefficient, especially when the pin-connected structure is located at a high position, posing a significant safety hazard. During use, the pin can easily slip out of its hole for various reasons. Without a reliable locking device, this can lead to the failure of the pin-connected structure and cause a safety accident. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic pin-connecting device with a locking function to replace manual pin connection work. The locking mechanism prevents the hydraulic cylinder from retracting or extending when it is not in operation, thus avoiding the risk of pin connection structure failure caused by the pin connected to the hydraulic cylinder accidentally coming out or going in.

[0004] The technical solution adopted in this invention includes a sleeve and a double-acting hydraulic cylinder connected to each other. A pin passes through the sleeve and is connected to the piston rod of the double-acting hydraulic cylinder through a connecting pin. The piston rod's extension and retraction movement drives the pin to extend and retract synchronously.

[0005] The double-acting hydraulic cylinder is equipped with an integrated valve block, which cooperates with a locking structure located inside the double-acting hydraulic cylinder to lock the piston rod.

[0006] The invention is further characterized in that,

[0007] The locking structure includes a cylinder, which is connected to a sleeve. A guide sleeve and a disc spring seat are nested inside the cylinder. The guide sleeve is sleeved with the piston rod. One end of the disc spring seat abuts against the guide sleeve, and the other end abuts against the cylinder.

[0008] The piston rod is also fitted with a locking block, spacer ring, and disc spring. The locking block, spacer ring, and disc spring are located inside the disc spring seat. The guide sleeve, spacer ring, and locking block form a control chamber inside the disc spring seat. The cylinder has a control oil passage that communicates with the control chamber. The control oil passage is connected to the integrated valve block through a pipe. The integrated valve block's control oil enters the control chamber through the control oil passage. The control locking block locks the piston rod.

[0009] The cross-section of the locking block is fan-shaped, and several locking blocks are arranged in a cylindrical shape to be sleeved with the piston rod. A partition frame is set between adjacent locking blocks.

[0010] Wedge-shaped rings are provided on the outer side of the block near both ends. When the two wedge-shaped rings slide towards each other relative to the outer side of the block, the friction between the block and the piston rod increases.

[0011] The spacer is positioned 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.

[0012] Breathing holes are radially opened on the cylinder and disc spring seat relative to the disc spring position, and a breather valve is installed on the cylinder relative to the breathing hole position.

[0013] The integrated valve block is equipped with a shuttle valve for controlling the direction of oil flow.

[0014] A locking pin hole is vertically opened along the radial direction on the sleeve. A safety locking pin passes through the locking pin hole and blocks the movement of the pin shaft, thus fixing the position of the pin shaft.

[0015] The double-acting hydraulic cylinder is equipped with a displacement sensor for detecting the extension and retraction of the pin.

[0016] A displacement sensor is installed on the pin to detect the extension and retraction of the pin.

[0017] The sleeve is equipped with a connecting flange for connecting to the cylinder.

[0018] The beneficial effects of this invention are:

[0019] (1) The hydraulic pin-piercing device with locking function of the present invention increases the friction between the block and the piston rod by squeezing the wedge ring, thereby locking the piston rod and preventing the piston rod from moving due to residual pressure in the rod- and rodless chambers of the double-acting hydraulic cylinder. The wedge ring increases or decreases the clamping force based on the oil pressure in the control chamber, thereby realizing the control of the locking function through hydraulics. When the pin extends or retracts to the designated position, the oil safety lock pin is used for further locking, which further improves the reliability of the locking function and reduces the possibility of other risks caused by the pin accidentally penetrating or retracting.

[0020] (2) The hydraulic pin device with locking function of the present invention is equipped with a displacement sensor on the hydraulic cylinder or pin to detect the extension or retraction state of the pin, so as to cut off the liquid supply of the A or B port of the integrated valve group in time and lock the pin in time, which further improves the locking effect of the device of the present invention. Attached Figure Description

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

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of the structure of I;

[0023] Figure 3This is a schematic diagram of the hydraulic pin-threading device with locking function of the present invention fully retracted and locked.

[0024] Figure 4 This is a schematic diagram of the hydraulic pin-threading device with locking function of the present invention fully extended and locked.

[0025] Figure 5 yes Figure 1 Cross-sectional view from perspective A;

[0026] Figure 6 yes Figure 3 A cross-sectional view from the perspective of B in the middle;

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

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

[0029] In the diagram, 1. Pin, 2. Connecting pin, 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 lock pin, 18. Lock pin hole, 19. Baffle bracket, 20. Control chamber, 21. Shuttle valve, 22. Displacement sensor. Detailed Implementation

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

[0031] Example 1

[0032] like Figure 1 As shown, the hydraulic pin-operated device with locking function of the present invention includes a sleeve 4 and a double-acting hydraulic cylinder 6 connected to each other. A pin 1 passes through the sleeve 4. The pin 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin 2. The extension and retraction of the piston rod 3 drives the pin 1 to extend and retract synchronously.

[0033] The double-acting hydraulic cylinder 6 is equipped with an integrated valve block 7, which has a shuttle valve 21 for controlling the oil flow direction. The integrated valve block 7 cooperates with a locking structure located inside the double-acting hydraulic cylinder 6 to lock the piston rod 3, thereby preventing the pin connected to the piston rod from accidentally extending or retracting.

[0034] like Figure 6As shown, in order to further improve the locking effect of the pin 1, a locking pin hole 18 is opened vertically along the radial direction on the sleeve 4. A safety locking pin 17 passes through the locking pin hole 18. The safety locking pin 17 passes through the locking pin hole 18 to block the movement of the pin 1, thus completing the fixation of the position of the pin 1.

[0035] Example 2

[0036] The present invention provides a hydraulic pin-operated device with locking function, comprising a sleeve 4 and a double-acting hydraulic cylinder 6 connected to each other. A pin 1 passes through the sleeve 4. The pin 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin 2. The extension and retraction of the piston rod 3 drives the pin 1 to extend and retract synchronously.

[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 the locking structure provided inside the double-acting hydraulic cylinder 6 to lock the piston rod 3.

[0038] like Figure 2 As shown, the locking structure includes a cylinder 9, which is connected to a sleeve 4. A guide sleeve 8 and a disc spring seat 14 are nested inside the cylinder 9. The guide sleeve 8 is sleeved with 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 9.

[0039] A retaining block 11, a spacer ring 12, and a disc spring 13 are also sleeved on the outside of the piston rod 3. The retaining block 11, spacer ring 12, and disc spring 13 are located inside the disc spring seat 14. The guide sleeve 8, retaining block 11, and spacer ring 12 form a control chamber 20 within the disc spring seat 14. Figure 5 As shown, the cross-section of the locking block 11 is fan-shaped, and several locking blocks 11 are arranged in a cylindrical shape to fit around the piston rod 3. A spacer 19 is provided between adjacent locking blocks 11. Wedge rings 10 are respectively provided on the outer side of the locking block 11 near both ends. When the two wedge rings 10 slide towards each other relative to the outer side of the locking block 11, they exert positive pressure on the locking block 11, pressing the locking block 11 against the piston rod 3. The increased pressure between the locking block 11 and the piston rod 3 will increase the friction between the locking block 11 and the piston rod 3. Ultimately, the friction between the two is greater than the pushing or pulling force on the piston rod 3, thus locking the piston rod. A spacer ring 12 is provided between the disc spring 13 and the wedge 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] The cylinder 9 has a control oil passage 16 that communicates with the control chamber 20. The control oil passage 16 is connected to the integrated valve block 7 through a pipe. The control oil of the integrated valve block 7 enters the control chamber 20 through the control oil passage 16, and the control block 11 locks the piston rod 3.

[0041] When the piston rod 3 needs to be locked, the disc spring 13 is in the extended state and applies a lateral force to the wedge ring 10 through the spacer 12. The wedge ring 10 slides relative to the locking block 11, squeezing the locking block 11 to form a downward pressure applied radially to the locking block 11, thereby increasing the friction between the locking block 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, increasing the pressure in the control chamber 20. The spacer 12 moves and compresses the disc spring 13, and the wedge ring 10 is no longer subjected to the lateral force applied by the spacer 12, stopping the squeezing of the locking block 11. When the hydraulic pressure in the rod chamber of the double-acting hydraulic cylinder 6 is greater than the friction between the locking block 11 and the piston rod 3, the piston rod 3 can extend and retract.

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

[0043] To further improve the locking effect of the pin 1, a locking pin hole 18 is opened vertically along the radial direction on the sleeve 4. A safety locking pin 17 passes through the locking pin hole 18. The safety locking pin 17 passes through the locking pin hole 18 to block the movement of the pin 1, thus fixing the position of the pin 1.

[0044] Example 3

[0045] The present invention provides a hydraulic pin-operated device with locking function, comprising a sleeve 4 and a double-acting hydraulic cylinder 6 connected to each other. A pin 1 passes through the sleeve 4. The pin 1 is connected to the piston rod 3 of the double-acting hydraulic cylinder 6 through a connecting pin 2. The extension and retraction of the piston rod 3 drives the pin 1 to extend and retract synchronously. A connecting flange 5 is provided on the sleeve 4 for connecting to the cylinder 9.

[0046] The double-acting hydraulic cylinder 6 is equipped with an integrated valve block 7, which has a shuttle valve 21 for controlling the oil flow direction. The integrated valve block 7 cooperates with a locking structure located inside the double-acting hydraulic cylinder 6 to lock and release the piston rod 3.

[0047] like Figure 7 As shown, the integrated valve block 7 has two oil supply ports, A and B. By supplying oil to port A or port B, the piston rod 3 on the double-acting hydraulic cylinder 6 can extend or retract. That is, when oil is supplied to port A, oil is actually injected into the rodless chamber of the double-acting hydraulic cylinder 6, which realizes the extension of the piston rod 3. When oil is supplied to port B, oil is injected into the rod chamber, which realizes the retraction of the piston rod 3.

[0048] The locking structure includes a cylinder 9, which is connected to a sleeve 4. A guide sleeve 8 and a disc spring seat 14 are nested inside the cylinder 9. The guide sleeve 8 is sleeved with 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 9.

[0049] A retaining block 11, a spacer ring 12, and a disc spring 13 are also sleeved on the outside of the piston rod 3. The retaining block 11, spacer ring 12, and disc spring 13 are located inside the disc spring seat 14. The guide sleeve 8, retaining block 11, and spacer ring 12 form a control chamber 20 within the disc spring seat 14. Figure 5 As shown, the cross-section of the locking block 11 is fan-shaped, and several locking blocks 11 are arranged in a cylindrical shape to fit around the piston rod 3. A spacer 19 is provided between adjacent locking blocks 11. Wedge rings 10 are respectively provided on the outer side of the locking block 11 near both ends. When the two wedge rings 10 slide towards each other relative to the outer side of the locking block 11, the friction between the locking block 11 and the piston rod 3 increases. A spacer ring 12 is provided between the disc spring 13 and the wedge 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] Breathing holes are radially opened on the cylinder 9 and disc spring seat 14 relative to the disc spring 13, and a breather valve 15 is provided on the cylinder 9 relative to the breathing holes. This ensures that the disc spring 13 is always open to the atmosphere during compression and release, preventing the formation of a sealed chamber between the spacer ring 12 and the disc spring seat 14, which would affect the compression force of the disc spring 13.

[0051] The cylinder 9 has a control oil passage 16 that communicates with the control chamber 20. The control oil passage 16 is connected to the integrated valve block 7 through a pipe. The control oil of the integrated valve block 7 enters the control chamber 20 through the control oil passage 16, and the control block 11 locks the piston rod 3.

[0052] A locking pin hole 18 is vertically opened on the sleeve 4 along the radial direction. A safety locking pin 17 passes through the locking pin hole 18. The safety locking pin 17 passes through the locking pin hole 18 to block the movement of the pin 1, thus fixing the position of the pin 1.

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

[0054] The operation of this invention mainly consists of two processes: the retraction of pin 1 and the extension of pin 1. The specific working process is as follows:

[0055] The pin retraction process is as follows:

[0056] At the start of operation, hydraulic oil is supplied to port B of the integrated valve block 7. When the pressure reaches point b, the oil 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, and after exiting the shuttle valve 21, it is guided to the control oil passage 16. Since the control oil passage 16 is connected to the control chamber 20, the hydraulic oil eventually flows into the control chamber 20. After the hydraulic oil flows into the control chamber 20, it pushes the spacer ring 12 to move to the right, starting to compress the disc spring 13, thus balancing the lateral force exerted by the disc spring 13 on the wedge ring 10. As the lateral force exerted by the disc spring 13 on the wedge ring 10 gradually decreases due to the increased hydraulic oil pressure, its own clamping force on the locking block 11 gradually decreases. The decrease in the clamping force on the locking block 11 further reduces the frictional force between the locking block 11 and the piston rod 3.

[0057] At the initial oil supply, under the action of hydraulic oil in the rod chamber of the double-acting hydraulic cylinder 6, the piston rod 3 tends to retract. However, because the force of 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 hydraulic oil pressure increases to a certain value, the force of retraction of the piston rod 3 is greater than the frictional force exerted on it by the locking block 11, and the piston rod 3 can retract.

[0058] During the retraction of piston rod 3, it drives the connected pin 1 to retract into sleeve 4. Once pin 1 is fully retracted, oil supply to port B of integrated valve block 7 stops, and the hydraulic oil pressure in control chamber 20 drops to zero. The compressed disc spring 13 rebounds, and spacer ring 12 moves to the left under the rebound force of disc spring 13, thereby pushing wedge ring 10 to slide upwards along the inclined surface that slides with locking block 11. This increases the clamping force on locking block 11, meaning the frictional force between locking block 11 and piston rod 3 continuously increases, preventing piston rod 3 from moving due to residual pressure in the rod-operated and rodless chambers of double-acting hydraulic cylinder 6. This achieves the locking function of the pin retracted state. The fully retracted and locked state of the pin is as follows: Figure 3 As shown.

[0059] The pin extension process is as follows:

[0060] At the start of operation, hydraulic oil is supplied to port A of the integrated valve block 7. When the pressure reaches point a, the oil splits into two: 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 outwards; the other path leads to the inlet of the shuttle valve 21, and after flowing out of the shuttle valve 21, it is guided to the control oil passage 16. Since the control oil passage 16 is connected to the control chamber 20, the hydraulic oil eventually flows into the control chamber 20. After the hydraulic oil flows into the control chamber 20, it pushes the spacer ring 12 to move to the right, starting to compress the disc spring 13, thus balancing the lateral force exerted by the disc spring 13 on the wedge ring 10. As the lateral force exerted by the disc spring 13 on the wedge ring 10 gradually decreases due to the increased hydraulic oil pressure, its own clamping force on the locking block 11 gradually decreases. The decrease in the clamping force on the locking block 11 further reduces the frictional force between the locking block 11 and the piston rod 3.

[0061] At the initial oil supply, under the action of hydraulic oil in the rodless chamber of the double-acting hydraulic cylinder 6, the piston rod 3 tends to extend outward. However, because the force exerted on it to extend outward is less than the frictional force exerted on it by the locking block 11, the piston rod 3 cannot move. But when the pressure of the hydraulic oil increases to a certain value, the force exerted on the piston rod 3 to extend outward is greater than the frictional force exerted on it by the locking block 11, and the piston rod 3 can then extend.

[0062] During the extension of piston rod 3, the pin 1 connected to it also extends outward from the sleeve 4. Once pin 1 is fully extended, oil supply to port A of integrated valve block 7 stops, and the hydraulic oil pressure in control chamber 20 drops to zero. The compressed disc spring 13 rebounds, and spacer ring 12 moves to the left under the rebound force of disc spring 13, thereby pushing wedge ring 10 to slide upward along the inclined surface that slides with locking block 11. This increases the clamping force on locking block 11, meaning the frictional force between locking block 11 and piston rod 3 continuously increases, preventing piston rod 3 from moving due to residual pressure in the rod- and rodless chambers of the double-acting hydraulic cylinder 6. This achieves the locking function for the extended pin state. The fully extended and locked state of the pin is as follows: Figure 4 As shown.

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

Claims

1. A hydraulic pin-operated device with locking function, comprising a sleeve (4) and a double-acting hydraulic cylinder (6) connected to each other, characterized in that, The sleeve (4) has a pin (1) inside. The pin (1) is connected to the piston rod (3) of the double-acting hydraulic cylinder (6) through a connecting pin (2). The extension and retraction of the piston rod (3) drives the pin (1) to extend and retract synchronously. The double-acting hydraulic cylinder (6) is provided with an integrated valve block (7), which cooperates with the locking structure provided inside the double-acting hydraulic cylinder (6) to lock the piston rod (3). The locking structure includes a cylinder (9), which is connected to the sleeve (4). A guide sleeve (8) and a disc spring seat (14) are nested inside the cylinder (9). The guide sleeve (8) is sleeved with 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 (9). A locking block (11), a spacer (12), and a disc spring (13) are also sleeved on the outside of the piston rod (3). The locking block (11), the spacer (12), and the disc spring (13) are located inside the disc spring seat (14). The guide sleeve (8), the spacer (12), and the locking block (11) form a control chamber (20) inside the disc spring seat (14). The cylinder (9) has a control oil passage (16) that communicates with the control chamber (20). The control oil passage (16) is connected to the integrated valve block (7) through a pipe. The control oil of the integrated valve block (7) enters the control chamber (20) through the control oil passage (16). The control locking block (11) locks the piston rod (3). The cross-section of the card block (11) is fan-shaped, and several card blocks (11) are arranged in a cylindrical shape and sleeved with the piston rod (3). A partition frame (19) is provided between adjacent card blocks (11). The outer side of the locking block (11) is provided with wedge rings (10) near both ends. When the wedge rings (10) on both sides slide towards each other relative to the outer side of the locking block (11), the friction between the locking block (11) and the piston rod (3) increases.

2. The hydraulic pin-threading device with locking function according to claim 1, characterized in that, The spacer (12) is disposed between the disc spring (13) and the wedge ring (10). One end of the disc spring (13) abuts against the disc spring seat (14), and the other end abuts against the spacer (12).

3. The hydraulic pin-threading device with locking function according to claim 1, characterized in that, Breathing holes are radially opened on the cylinder (9) and disc spring seat (14) relative to the disc spring (13), and a breathing valve (15) is provided on the cylinder (9) relative to the breathing hole.

4. The hydraulic pin-threading device with locking function according to claim 1, characterized in that, The integrated valve block (7) is equipped with a shuttle valve (21) for controlling the oil flow direction.

5. The hydraulic pin-threading device with locking function according to claim 1, characterized in that, The sleeve (4) has a locking pin hole (18) perpendicular to the radial direction. A safety locking pin (17) passes through 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 completes the position fixation of the pin shaft (1).

6. The hydraulic pin-threading device with locking function according to any one of claims 1 to 5, characterized in that, The double-acting hydraulic cylinder (6) is equipped with a displacement sensor (22) for detecting the extension and retraction state of the pin (1).

7. The hydraulic pin-threading device with locking function according to any one of claims 1 to 5, characterized in that, The pin (1) is provided with a displacement sensor (22) for detecting the extension and retraction state of the pin (1).

8. The hydraulic pin-threading device with locking function according to any one of claims 1, characterized in that, The sleeve (4) is provided with a connecting flange (5) for connecting to the cylinder (9).

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