Hydraulic coupling oil cylinder piston locking device

Abstract

The invention belongs to the technical field of oil cylinders, and particularly relates to a hydraulic coupling oil cylinder piston locking device which comprises an oil cylinder body, two sets of supports are symmetrically and fixedly installed on the top of the oil cylinder body, a sliding shaft is fixedly installed between the inner walls of each set of supports, and sliding blocks are symmetrically and slidably installed on the outer walls of the sliding shafts. An elastic piece A is fixedly installed between the outer walls of the two sliding blocks close to each other, and the two elastic pieces A are arranged on the outer sides of the two sliding shafts in a sleeving mode correspondingly. Through the structures such as the lock, the extrusion assembly and the lifting assembly, the lock can lock the piston at any position, meanwhile, by means of the lever principle, the applied force is amplified and transmitted to the lock through the amplification effect of a lever, clamping can be more stable due to the fulcrum effect of the lever, and the clamping efficiency is improved. The clamping force of the lock can be more uniformly distributed on the piston of the oil cylinder, so that the piston is prevented from sliding in the locking process, and the locking effect is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil cylinders, and specifically relates to a hydraulic coupling oil cylinder piston locking device. Background Art

[0002] A hydraulic cylinder, also known as a hydraulic actuator, is a key actuating element in a hydraulic system. It can convert hydraulic energy into mechanical energy and achieve reciprocating linear motion (or swinging motion) through the driving force of liquid pressure. During the use of a hydraulic cylinder, in order to prevent it from slipping, a locking device is required to lock the piston of the oil cylinder to ensure that the piston of the oil cylinder remains stable at a specific position.

[0003] A Chinese patent with the publication number CN221054057U discloses a locking mechanism for a hydraulic cylinder. In this patent, the hydraulic rod in the hydraulic cylinder is driven by hydraulic oil in the cylinder to operate. When the hydraulic cylinder needs to be locked, the hydraulic rod in the locking assembly extends, driving the through rod at its end to pass through the rod hole on the chuck and extend into the lock hole on the piston rod, thereby achieving the purpose of locking the piston rod on the cylinder block, with a simple structure.

[0004] When the above patent performs the locking operation, it is necessary to extend the hydraulic rod and insert it into the interior of the lock hole to restrict the piston through the hydraulic rod to achieve the locking operation. However, the lock holes are opened on the surface of the piston. Since there is a certain interval between multiple lock holes, when performing the locking operation, the lock holes opened on the surface of the piston need to be aligned with the hydraulic rod when the piston extends. If the lock holes and the hydraulic rod are not aligned, the locking cannot be performed, which has certain limitations.

[0005] Therefore, the present invention provides a hydraulic coupling oil cylinder piston locking device. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A hydraulic coupling oil cylinder piston locking device of the present invention includes an oil cylinder body. Two groups of brackets are symmetrically and fixedly installed at the top of the oil cylinder body. A sliding shaft is fixedly installed between the inner walls of each group of brackets. Sliders are symmetrically and slidably installed on the outer walls of the sliding shafts. An elastic member A is fixedly installed between the outer walls of two adjacent sliders. The two elastic members A are respectively sleeved on the outer sides of the two sliding shafts. A lock is fixedly installed between the outer walls of the two sliders away from each other. Both locks are in contact with the oil cylinder body. A pressing block is fixedly installed on one side of each of the two locks away from each other. A pressing assembly is provided on one side of each of the two pressing blocks.

[0008] Preferably, the extrusion assembly includes hinge members, the two hinge members are respectively located above the two abutting blocks, an extrusion plate is rotatably installed on the inner wall of the hinge member, the outer walls of the two extrusion plates respectively abut against the outer walls of the two abutting blocks, and a lifting assembly is arranged on the outer wall of the oil cylinder body.

[0009] Preferably, the lifting assembly includes a lifting plate, the lifting plate is slidably installed on the outer wall of the oil cylinder body, two groups of positioning frames are symmetrically and fixedly installed on the top of the lifting plate, a lifting roller is rotatably installed between the inner walls of each group of positioning frames, the outer walls of the two lifting rollers respectively abut against the outer walls of the two extrusion plates, and a driving assembly is arranged below the lifting plate.

[0010] Preferably, the driving assembly includes a positioning disk, the positioning disk is fixedly installed on the outer wall of the oil cylinder body, a driving motor is fixedly installed at the bottom of the positioning disk, a screw rod is fixedly installed at the output end of the driving motor, the screw rod penetrates through the positioning disk and is in threaded connection with the lifting plate, positioning blocks are symmetrically and fixedly installed on the outer wall of the oil cylinder body, the inner wall of one of the positioning blocks is rotatably connected to one end of the screw rod away from the driving motor, and a limiting column is fixedly installed between the inner wall of the other positioning block and the inner wall of the positioning disk, and the outer wall of the limiting column is slidably connected to the inner wall of the lifting plate.

[0011] Preferably, a clamping block A and a moving block A are slidably installed on the inner wall of the lock, an elastic member B is fixedly installed between the outer walls of the clamping block A and the moving block A, clamping blocks B and moving blocks B are symmetrically and slidably installed on the inner wall of the lock, and corresponding elastic members C are fixedly installed between the outer walls of the clamping block B and the moving block B.

[0012] Preferably, rotating shafts are symmetrically and fixedly installed on the inner wall of the lock, rotating plates are rotatably installed on the outer walls of the rotating shafts, the outer walls of the rotating plates respectively abut against the outer wall of the moving block A, extrusion rollers are rotatably installed at the mutually remote ends of the two rotating plates, and the outer walls of the two extrusion rollers respectively abut against the outer walls of the two moving blocks B.

[0013] Preferably, connecting plates are fixedly installed at one ends of the extrusion plates close to the hinge members, and a cleaning box is arranged at one end of the connecting plate away from the extrusion plate.

[0014] Preferably, connecting blocks are fixedly installed on the outer wall of the cleaning box, the two connecting blocks are respectively inserted into the inner walls of the connecting plates, and the two connecting blocks are fixed to the two connecting plates respectively through positioning knobs arranged.

[0015] Preferably, a water-absorbing cotton is detachably installed on the inner wall of the cleaning box, a box cover is fixedly installed on the top of the cleaning box, a side plate is fixedly installed on the top of the oil cylinder body, the two hinge members are fixedly installed on the inner wall of the side plate, and a top plate is fixedly installed on the top of the side plate.

[0016] Preferably, a sliding plate is slidably installed on the inner wall of the limiting column. An elastic member D is fixedly installed between the sliding plate and the limiting column. Elastic telescopic shafts A and B are respectively fixedly installed at both ends of the sliding plate. The length of the elastic telescopic shaft A is greater than that of the elastic telescopic shaft B. Two buttons are fixedly installed on the top of the positioning disk. The two buttons are respectively located below the elastic telescopic shaft A and the elastic telescopic shaft B. One of the buttons abuts against the elastic telescopic shaft A, and the other button is in contact with the elastic telescopic shaft B. Two warning lights are fixedly installed on the outer wall of the positioning disk.

[0017] The beneficial effects of the present invention are as follows: 1. For the hydraulic coupling cylinder piston locking device of the present invention, through structures such as a lock, a pressing assembly, and a lifting assembly, the lock can lock the piston at any position. At the same time, using the lever principle, the applied force is amplified and transmitted to the lock through the amplification effect of the lever. Due to the fulcrum effect of the lever, the clamping can be more stable, and the clamping force of the lock can be more evenly distributed on the piston of the oil cylinder, thereby preventing the piston from sliding during the locking process and making the locking effect better.

[0018] 2. For the hydraulic coupling cylinder piston locking device of the present invention, the elastic member B and the elastic member C in the compressed state will give the clamping block A and the clamping block B reverse elastic forces, so that the clamping block A and the clamping block B apply a stable clamping force to the workpiece, thereby improving the clamping stability. Through the cooperation of the rotating shaft, the rotating plate, and the pressing roller, using the lever principle to mutually squeeze the elastic member B and the elastic member C, the balance and amplification of force are realized, further increasing the clamping effect and making the locking work more stable.

[0019] 3. For the hydraulic coupling cylinder piston locking device of the present invention, when the piston contracts, the cleaning box remains in contact with the piston. The cleaning box will scrape off the debris adhered to the surface of the piston and collect it, thereby preventing impurities from entering the interior of the oil cylinder body along with the piston and avoiding adverse effects on the oil cylinder body. When the piston extends, the two locks approach each other again but do not contact the piston. At this time, the piston has the condition to move, and at this time, the two cleaning boxes also do not contact the piston, thereby reducing the risk of wear and damage to the piston. Brief Description of the Drawings

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a partial enlarged structural view of the oil cylinder body of the present invention; Figure 3It is a schematic structural diagram of the lifting plate of the present invention; Figure 4 It is a schematic structural diagram of the extrusion plate of the present invention; Figure 5 It is a schematic structural diagram of the lock of the present invention; Figure 6 It is a cross-sectional view of the lock structure of the present invention; Figure 7 It is of the present invention Figure 6 The enlarged view of the structure at position A in Figure 8 It is a schematic structural diagram of the connecting plate of the present invention; Figure 9 It is a schematic structural diagram of the cleaning box of the present invention; Figure 10 It is a schematic structural diagram of the limiting post of the present invention; Figure 11 It is a cross-sectional view of the limiting post structure of the present invention; In the figure: 1. Oil cylinder body; 2. Bracket; 3. Slide shaft; 4. Slide block; 5. Elastic member A; 6. Lock; 7. Block; 8. Hinge member; 9. Extrusion plate; 10. Lifting plate; 11. Positioning frame; 12. Lifting roller; 13. Positioning disc; 14. Driving motor; 15. Screw; 16. Positioning block; 17. Limiting post; 18. Clamping block A; 19. Elastic member B; 20. Moving block A; 21. Clamping block B; 22. Elastic member C; 23. Moving block B; 24. Rotating shaft; 25. Rotating plate; 26. Extrusion roller; 27. Connecting plate; 28. Cleaning box; 29. Connecting block; 30. Positioning knob; 31. Absorbent cotton; 32. Box cover; 33. Side plate; 34. Top plate; 35. Sliding plate; 36. Elastic member D; 37. Elastic telescopic shaft A; 38. Elastic telescopic shaft B; 39. Button; 40. Warning lamp. Specific embodiments

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0023] Such as Figures 1 to 5As shown in the figure, a hydraulic coupling cylinder piston locking device according to an embodiment of the present invention includes a cylinder body 1. Two groups of brackets 2 are symmetrically and fixedly installed at the top of the cylinder body 1. A sliding shaft 3 is fixedly installed between the inner walls of each group of brackets 2. Sliders 4 are symmetrically and slidably installed on the outer walls of the sliding shafts 3. An elastic member A5 is fixedly installed between the outer walls of two adjacent sliders 4. The two elastic members A5 are respectively sleeved on the outer sides of the two sliding shafts 3. A lock 6 is fixedly installed between the outer walls of the two sliders 4 that are away from each other. The two locks 6 are both in contact with the cylinder body 1. A pressing block 7 is fixedly installed on one side of each of the two locks 6 that are away from each other. A pressing component is provided on one side of each of the two pressing blocks 7; when the cylinder body 1 drives the piston to reach a specified position, the pressing component will simultaneously press the pressing blocks 7 from both sides. After being pressed, the pressing blocks 7 will push the two locks 6 closer to each other. The approaching locks 6 will clamp the piston of the cylinder body 1, thereby realizing the piston locking operation. Before the lock 6 performs the locking operation, the piston can extend to any length, so that the locking operation can be performed at any position. The locking operation does not need to be carried out in an aligned state. Through the cooperation of the sliding shaft 3 and the slider 4, the position of the lock 6 is restricted to ensure that the lock 6 moves along a preset direction. When performing the locking operation, the elastic member A5 will contract under the extrusion of the slider 4. When the pressing component retracts, the lock 6 will separate from the piston under the action of the reverse elastic force of the elastic member A5, thereby avoiding unnecessary friction.

[0024] As Figures 1 to 4 shown, the pressing component includes a hinge member 8. The two hinge members 8 are respectively located above the two pressing blocks 7. A pressing plate 9 is rotatably installed on the inner wall of the hinge member 8. The outer walls of the two pressing plates 9 are respectively in contact with the outer walls of the two pressing blocks 7. A lifting component is provided on the outer wall of the cylinder body 1; when performing the locking operation, the lifting component will descend to press one end of the pressing plate 9. The pressing plate 9 will rotate around the hinge member 8. When the pressing plate 9 rotates, it will press the pressing block 7 so that the two locks 6 move closer to each other to perform the locking operation. The pressing plate 9 rotates around the hinge member 8. Using the lever principle, the applied force is amplified and transmitted to the lock 6 through the amplification effect of the lever. Due to the fulcrum effect of the lever, the clamping can be more stable, and the clamping force of the lock 6 can be more evenly distributed on the piston of the cylinder, thereby preventing the piston from sliding during the locking process and making the locking effect better.

[0025] As Figures 1 to 4As shown in the figure, the lifting assembly includes a lifting plate 10 which is slidably mounted on the outer wall of the oil cylinder body 1. Two groups of positioning brackets 11 are symmetrically and fixedly mounted on the top of the lifting plate 10. A lifting roller 12 is rotatably mounted between the inner walls of each group of positioning brackets 11. The outer walls of the two lifting rollers 12 are respectively in contact with the outer walls of the two pressing plates 9. A driving assembly is arranged below the lifting plate 10. When it is necessary to lock the piston of the oil cylinder, the lifting plate 10 slides downward along the outer wall of the oil cylinder body 1. When the lifting plate 10 slides, it will drive the lifting roller 12 to move downward through the two groups of positioning brackets 11. Since the pressing plate 9 is inclined, when the lifting roller 12 descends, it will squeeze the pressing plate 9. The pressed pressing plate 9 will rotate around the hinge 8, thereby pushing the lock 6 to perform the locking work.

[0026] As Figures 1 to 3 shown in the figure, the driving assembly includes a positioning disc 13 which is fixedly mounted on the outer wall of the oil cylinder body 1. A driving motor 14 is fixedly mounted at the bottom of the positioning disc 13. A screw rod 15 is fixedly mounted at the output end of the driving motor 14. The screw rod 15 passes through the positioning disc 13 and is in threaded connection with the lifting plate 10. Positioning blocks 16 are symmetrically and fixedly mounted on the outer wall of the oil cylinder body 1. The inner wall of one of the positioning blocks 16 is rotatably connected to the end of the screw rod 15 away from the driving motor 14. A limiting column 17 is fixedly mounted between the inner wall of the other positioning block 16 and the inner wall of the positioning disc 13. The outer wall of the limiting column 17 is slidably connected to the inner wall of the lifting plate 10. When performing the locking work, the driving motor 14 will drive the screw rod 15 to rotate. When the screw rod 15 rotates, it will make the lifting plate 10 descend through the cooperation with the thread of the lifting plate 10, so that the lifting roller 12 descends to perform the locking work. On the contrary, when it is necessary to release the locking of the piston, the driving motor 14 is made to drive the screw rod 15 to reverse. At this time, the lifting plate 10 rises, and the two locks 6 will separate under the action of the elastic member A5.

[0027] As Figures 5 to 6 shown in the figure, a clamping block A18 and a moving block A20 are slidably mounted on the inner wall of the lock 6. An elastic member B19 is fixedly mounted between the outer walls of the clamping block A18 and the moving block A20. Clamping blocks B21 and moving blocks B23 are symmetrically and slidably mounted on the inner wall of the lock 6. An elastic member C22 is fixedly mounted between the outer walls of the corresponding clamping blocks B21 and moving blocks B23. In the initial state, the clamping block A18 and the clamping block B21 respectively extend to the outside of the lock 6 under the action of the elastic member B19 and the elastic member C22. When locking the piston, the lock 6 will fit with the piston, and the clamping block A18 and the clamping block B21 will be squeezed by the piston and enter the inside of the lock 6. At this time, the elastic member B19 and the elastic member C22 are in a compressed state. The compressed elastic member B19 and elastic member C22 will give the clamping block A18 and the clamping block B21 a reverse elastic force, so that the clamping block A18 and the clamping block B21 apply a stable clamping force to the workpiece, thereby improving the clamping stability.

[0028] As Figures 5 to 7 shown, the inner walls of the locks 6 are symmetrically and fixedly installed with rotating shafts 24. Rotating plates 25 are rotatably installed on the outer walls of the rotating shafts 24. The outer walls of the rotating plates 25 are in contact with the outer walls of the moving blocks A20. At the mutually remote ends of the two rotating plates 25, extrusion rollers 26 are rotatably installed. The outer walls of the two extrusion rollers 26 are respectively in contact with the outer walls of the two moving blocks B23. After the elastic member B19 is compressed, the reverse elastic force of the elastic member B19 will be applied to the moving block A20, so that the moving block A20 squeezes the rotating plate 25. The rotating plate 25 will rotate around the rotating shaft 24 and the extrusion roller 26 will squeeze the moving block B23. At the same time, after the elastic member C22 is compressed, the reverse elastic force of the elastic member C22 will also be applied to the moving block B23. The moving block B23 will squeeze the rotating plate 25 through the extrusion roller 26. The rotating plate 25 will rotate around the rotating shaft 24 and squeeze the moving block A20. Through the cooperation of the rotating shaft 24, the rotating plate 25 and the extrusion roller 26, the elastic member B19 and the elastic member C22 are mutually squeezed by using the lever principle to achieve the balance and amplification of force, further increasing the clamping effect and making the locking work more stable.

[0029] As Figure 4 and Figure 8 shown, connecting plates 27 are fixedly installed at the ends of the extrusion plates 9 close to the hinge members 8. At the ends of the connecting plates 27 remote from the extrusion plates 9, cleaning boxes 28 are provided. When the piston of the oil cylinder body 1 retracts, the two locks 6 will separate from each other to release the locking work on the piston. When the locks 6 separate from each other, the abutting blocks 7 will squeeze the extrusion plates 9 to make them rotate around the hinge members 8. When the extrusion plates 9 rotate, the connecting plates 27 will rotate together with the extrusion plates 9. When the connecting plates 27 rotate, they will drive the cleaning boxes 28 to rotate. The two cleaning boxes 28 will approach each other and fit with the piston. When the cleaning boxes 28 fit with the piston, the piston starts to contract. When the piston contracts, since the cleaning boxes 28 are in a fitting state with the piston, the cleaning boxes 28 will scrape off the sundries adhered to the surface of the piston and collect them, thus preventing impurities from entering the interior of the oil cylinder body 1 along with the piston and avoiding adverse effects on the oil cylinder body 1. When the piston extends, the two locks 6 approach each other again but do not fit with the piston. At this time, the piston has the condition to move, and at this time the two cleaning boxes 28 also do not fit with the piston, thus reducing the risk of wear and damage to the piston.

[0030] As Figures 8 to 9As shown, a connecting block 29 is fixedly installed on the outer wall of the cleaning box 28. The two connecting blocks 29 are respectively inserted into the inner wall of the connecting plate 27, and the two connecting blocks 29 are fixed to the two connecting plates 27 respectively through the set positioning knobs 30. The cleaning box 28 is connected to the connecting plate 27 through the connecting block 29 and fixed through the positioning knob 30. When the two cleaning boxes 28 move away from each other, rotate the positioning knob 30 to release the fixation of the connecting block 29, and then the cleaning box 28 can be removed, which is convenient for processing the impurities collected inside the cleaning box 28.

[0031] As Figures 1 to 2 and Figures 8 to 9 shown, a water-absorbing cotton 31 is detachably installed on the inner wall of the cleaning box 28. A box cover 32 is fixedly installed on the top of the cleaning box 28. A side plate 33 is fixedly installed on the top of the oil cylinder body 1. Two hinge members 8 are fixedly installed on the inner wall of the side plate 33. A top plate 34 is fixedly installed on the top of the side plate 33. When the piston contracts, the cleaning box 28 scrapes the impurities adhered to the surface of the piston. After the piston passes through the scraping, it will pass through the water-absorbing cotton 31. The water-absorbing cotton 31 can absorb the liquid adhered to the piston, keep the piston dry, and prevent the liquid from entering the inside of the oil cylinder body 1 following the piston and causing equipment damage. The setting of the box cover 32 is to reduce the spillage of the impurities collected inside the cleaning box 28. The hinge member 8 is connected to the side plate 33 to fix the position of the hinge member 8. The side plate 33 and the top plate 34 wrap the lock 6, which can protect the lock 6. When the cleaning box 28 fits with the piston, the bottom of the cleaning box 28 will fit with the top plate 34, and the cleaning box 28 is supported by the top plate 34 to increase the stability of the cleaning box 28.

[0032] As Figure 2 and Figures 10 to 11As shown, a sliding plate 35 is slidably installed on the inner wall of the limit post 17. An elastic member D36 is fixedly installed between the sliding plate 35 and the limit post 17. Elastic telescopic shafts A37 and B38 are respectively fixedly installed at both ends of the sliding plate 35. The length of the elastic telescopic shaft A37 is greater than that of the elastic telescopic shaft B38. Two buttons 39 are fixedly installed on the top of the positioning disk 13. The two buttons 39 are respectively located below the elastic telescopic shaft A37 and the elastic telescopic shaft B38. One of the buttons 39 abuts against the elastic telescopic shaft A37, and the other button 39 is in contact with the elastic telescopic shaft B38. Two warning lights 40 are fixedly installed on the outer wall of the positioning disk 13; the two warning lights 40 are respectively electrically connected to the buttons 39 above them. When the button 39 located below the elastic telescopic shaft A37 is not pressed, the warning light 40 connected to it lights up red, and conversely, when it is pressed, it lights up green. When the button 39 located below the elastic telescopic shaft B38 is not pressed, the warning light 40 connected to it lights up green, and conversely, when it is pressed, it lights up red. When the piston needs to be locked, the lifting plate 10 will descend. When the lifting plate 10 descends, it will squeeze the sliding plate 35 to make it descend accordingly. When the sliding plate 35 descends, the elastic telescopic shafts A37 and B38 will descend together. Since the length of the elastic telescopic shaft A37 is greater than that of the elastic telescopic shaft B38, the elastic telescopic shaft A37 will first press the button 39 below it. When the piston is locked, the lifting plate 10 stops moving. At this time, the elastic telescopic shaft A37 just presses the button 39, and the elastic telescopic shaft B38 just touches the button 39 but cannot press the button 39. At this time, both warning lights 40 are green, indicating that the device is operating normally. After the lifting plate 10 stops moving, if the elastic telescopic shaft A37 fails to press the button 39, the corresponding warning light 40 will still remain red to give an alarm, indicating that there may be impurities between the piston and the lock 6 blocking the movement of the lock 6, and the locking operation fails. After the lifting plate 10 stops moving, if the elastic telescopic shaft B38 presses the button 39 and the corresponding warning light 40 turns red to give an alarm, it means that the lock 6 has moved excessively, and there may be a risk of deformation of the lock 6 or the piston. In summary, when both warning lights 40 are green, the device is normal. When one of the two warning lights 40 is red, the device is abnormal and corresponding measures need to be taken to achieve the effect of automatically detecting the device.

[0033] Working principle: After the oil cylinder body 1 drives the piston to reach the specified position, the extrusion assembly will simultaneously extrude the abutting blocks 7 from both sides. After being extruded, the abutting blocks 7 will push the two locks 6 towards each other. After approaching, the locks 6 will clamp the piston of the oil cylinder body 1, thus realizing the piston locking operation. Before the locks 6 perform the locking operation, the piston can extend to any length, so that the locking operation can be carried out at any position. The locking operation does not need to be carried out in an aligned state. Through the cooperation of the sliding shaft 3 and the slider 4, the position of the locks 6 is restricted to ensure that the locks 6 move along the preset direction. When performing the locking operation, the elastic member A5 will contract under the extrusion of the slider 4. When the extrusion assembly retracts, the locks 6 will separate from the piston under the action of the reverse elastic force of the elastic member A5, thus avoiding unnecessary friction. When performing the locking operation, the lifting assembly will descend to extrude one end of the extrusion plate 9. The extrusion plate 9 will rotate around the hinge 8. When the extrusion plate 9 rotates, it will extrude the abutting blocks 7, so that the two locks 6 approach each other to perform the locking operation. The extrusion plate 9 rotates around the hinge 8. Using the lever principle, the applied force is amplified and transmitted to the locks 6 through the amplification effect of the lever. Due to the fulcrum effect of the lever, the clamping can be more stable, and the clamping force of the locks 6 can be more evenly distributed on the piston of the oil cylinder, thus avoiding the piston from sliding during the locking process and making the locking effect better. When locking, the lifting plate 10 slides downward along the outer wall of the oil cylinder body 1. When the lifting plate 10 slides, it will drive the lifting roller 12 to move downward through the two groups of positioning frames 11. Since the extrusion plate 9 is inclined, when the lifting roller 12 descends, it will extrude the extrusion plate 9, and the extruded extrusion plate 9 will rotate around the hinge 8, thus pushing the locks 6 to perform the locking operation.

[0034] In the initial state, the clamping block A18 and the clamping block B21 extend to the outside of the lock 6 under the action of the elastic member B19 and the elastic member C22 respectively. When the piston is locked, the lock 6 will fit with the piston, and the clamping block A18 and the clamping block B21 will be squeezed by the piston and enter the inside of the lock 6. At this time, the elastic member B19 and the elastic member C22 are in a compressed state. The compressed elastic member B19 and elastic member C22 will give the clamping block A18 and the clamping block B21 a reverse elastic force, so that the clamping block A18 and the clamping block B21 apply a stable clamping force to the workpiece, thereby improving the clamping stability. After the elastic member B19 is compressed, the reverse elastic force of the elastic member B19 will be applied to the moving block A20, so that the moving block A20 squeezes the rotating plate 25, and the rotating plate 25 will rotate around the rotating shaft 24 and the squeezing roller 26 squeezes the moving block B23. At the same time, after the elastic member C22 is compressed, the reverse elastic force of the elastic member C22 will also be applied to the moving block B23, and the moving block B23 will squeeze the rotating plate 25 through the squeezing roller 26. The rotating plate 25 will rotate around the rotating shaft 24 and squeeze the moving block A20. Through the cooperation of the rotating shaft 24, the rotating plate 25 and the squeezing roller 26, the elastic member B19 and the elastic member C22 are mutually squeezed by using the lever principle to achieve force balance and amplification, further increasing the clamping effect and making the locking work more stable.

[0035] When the piston of the oil cylinder body 1 retracts, the two locks 6 will separate from each other to release the locking of the piston. When the locks 6 separate from each other, the abutting block 7 will squeeze the pressing plate 9 to make it rotate around the hinge 8. When the pressing plate 9 rotates, the connecting plate 27 will rotate together with the pressing plate 9. When the connecting plate 27 rotates, it will drive the cleaning box 28 to rotate. The two cleaning boxes 28 will approach each other and fit with the piston. After the cleaning box 28 fits with the piston, the piston starts to contract. When the piston contracts, since the cleaning box 28 remains in contact with the piston, the cleaning box 28 will scrape off the sundries adhering to the piston surface and collect them, thereby preventing impurities from entering the interior of the oil cylinder body 1 along with the piston and avoiding adverse effects on the oil cylinder body 1. When the piston extends, the two locks 6 approach each other again but do not fit with the piston. At this time, the piston has the condition to move, and at this time, the two cleaning boxes 28 also do not fit with the piston, thereby reducing the risk of wear and damage to the piston. The cleaning box 28 is connected to the connecting plate 27 through the connecting block 29 and is fixed by the positioning knob 30. After the two cleaning boxes 28 move away from each other, rotate the positioning knob 30 to release the fixation of the connecting block 29, and then the cleaning box 28 can be removed, which is convenient for processing the impurities collected inside the cleaning box 28. When the piston contracts, the cleaning box 28 will scrape the impurities adhering to the piston surface. After being scraped, the piston will pass through the absorbent cotton 31. The absorbent cotton 31 can absorb the liquid adhering to the piston to keep the piston dry and prevent the liquid from entering the interior of the oil cylinder body 1 along with the piston and causing equipment damage. The setting of the box cover 32 is to reduce the spilling of the impurities collected inside the cleaning box 28.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic coupling cylinder piston locking device, comprising a cylinder body, characterized in that: Two groups of brackets are symmetrically and fixedly installed at the top of the oil cylinder body. A sliding shaft is fixedly installed between the inner walls of each group of brackets. Sliders are symmetrically and slidably installed on the outer walls of the sliding shafts. An elastic member A is fixedly installed between the outer walls of two adjacent sliders. The two elastic members A are respectively sleeved on the outer sides of the two sliding shafts. A lock is fixedly installed between the outer walls of the two sliders far from each other. Both locks are in contact with the oil cylinder body. A pressing block is fixedly installed on one side of each of the two locks far from each other. A pressing assembly is arranged on one side of each of the two pressing blocks.

2. The hydraulic coupling cylinder piston locking device according to claim 1, wherein: The pressing assembly includes hinge members. The two hinge members are respectively located above the two pressing blocks. A pressing plate is rotatably installed inside the hinge member. The outer walls of the two pressing plates are respectively in contact with the outer walls of the two pressing blocks. A lifting assembly is arranged on the outer wall of the oil cylinder body.

3. A hydraulic coupling cylinder piston locking device according to claim 2, characterized in that: The lifting assembly includes a lifting plate. The lifting plate is slidably installed on the outer wall of the oil cylinder body. Two groups of positioning brackets are symmetrically and fixedly installed at the top of the lifting plate. A lifting roller is rotatably installed between the inner walls of each group of positioning brackets. The outer walls of the two lifting rollers are respectively in contact with the outer walls of the two pressing plates. A driving assembly is arranged below the lifting plate.

4. A hydraulic coupling cylinder piston locking device according to claim 3, characterized in that: The driving assembly includes a positioning disk. The positioning disk is fixedly installed on the outer wall of the oil cylinder body. A driving motor is fixedly installed at the bottom of the positioning disk. A screw rod is fixedly installed at the output end of the driving motor. The screw rod penetrates through the positioning disk and is in threaded connection with the lifting plate. Positioning blocks are symmetrically and fixedly installed on the outer wall of the oil cylinder body. One end of the screw rod far from the driving motor is rotatably connected to the inner wall of one of the positioning blocks. A limiting column is fixedly installed between the inner wall of the other positioning block and the inner wall of the positioning disk. The outer wall of the limiting column is slidably connected to the inner wall of the lifting plate.

5. A hydraulic coupling cylinder piston locking device according to claim 4, characterized in that: A clamping block A and a moving block A are slidably installed inside the lock. An elastic member B is fixedly installed between the outer walls of the clamping block A and the moving block A. A clamping block B and a moving block B are symmetrically and slidably installed inside the lock. An elastic member C is fixedly installed between the outer walls of the corresponding clamping block B and moving block B.

6. The hydraulic coupling cylinder piston locking device according to claim 5, characterized in that: Rotating shafts are symmetrically and fixedly installed inside the lock. Rotating plates are rotatably installed on the outer walls of the rotating shafts. The outer walls of the rotating plates are respectively in contact with the outer wall of the moving block A. Pressing rollers are rotatably installed at one end of each of the two rotating plates far from each other. The outer walls of the two pressing rollers are respectively in contact with the outer walls of the two moving blocks B.

7. A hydraulic coupling cylinder piston locking device according to claim 6, characterized in that: A connecting plate is fixedly installed at one end of the pressing plate close to the hinge member. A cleaning box is arranged at one end of the connecting plate far from the pressing plate.

8. A hydraulic coupling cylinder piston locking device according to claim 7, characterized in that: A connecting block is fixedly installed on the outer wall of the cleaning box. The two connecting blocks are respectively inserted into the inner walls of the connecting plates. The two connecting blocks are fixed to the two connecting plates respectively through positioning knobs arranged.

9. The hydraulic coupling cylinder piston locking device according to claim 8, characterized in that: A water-absorbing cotton is detachably installed inside the cleaning box. A box cover is fixedly installed at the top of the cleaning box. A side plate is fixedly installed at the top of the oil cylinder body. The two hinge members are fixedly installed on the inner wall of the side plate. A top plate is fixedly installed at the top of the side plate.

10. A hydraulic coupling cylinder piston locking device according to claim 9, characterized in that: A sliding plate is slidably installed on the inner wall of the limiting column. An elastic member D is fixedly installed between the sliding plate and the limiting column. Elastic telescopic shafts A and B are respectively fixedly installed at both ends of the sliding plate. The length of the elastic telescopic shaft A is greater than that of the elastic telescopic shaft B. Two buttons are fixedly installed on the top of the positioning disk. The two buttons are respectively located below the elastic telescopic shaft A and the elastic telescopic shaft B. One of the buttons abuts against the elastic telescopic shaft A, and the other button is in contact with the elastic telescopic shaft B. Two warning lights are fixedly installed on the outer wall of the positioning disk.

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