A repairing device and method for hydraulic cylinder of large hydraulic grab ship

Abstract

The application discloses a kind of repair device and method of large hydraulic grab ship hydraulic cylinder, belong to oil cylinder repair technical field.A kind of repair device of large hydraulic grab ship hydraulic cylinder, including base, further include: moving assembly, moving assembly is set on base and is used to drive polishing part displacement;Arc-shaped support seat, arc-shaped support seat is fixed on base, for supporting cylinder;Positioning assembly, positioning assembly is set on the side of arc-shaped support seat, for clamping and positioning cylinder;And self-adjusting coaxial assembly, the two sides of self-adjusting coaxial assembly are connected with polishing part and positioning assembly respectively, for coaxially setting polishing part with cylinder;The application is fixed while limiting cylinder, makes polishing part automatically adjust and cylinder coaxial, reduces the coaxial adjustment step of cumbersome, so that the device is suitable for different sizes of hydraulic cylinder repair, effectively improve oil cylinder repair efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil cylinder repair, and in particular to a large hydraulic grab ship hydraulic oil cylinder repair device and method. BACKGROUND

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, which makes linear reciprocating motion (or oscillating motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the reduction device can be omitted, and there is no transmission gap, and the movement is stable, so it is widely used in various mechanical hydraulic systems. The hydraulic cylinder of the ship grab bucket is subjected to the friction of the reciprocating movement of the piston, and the inner wall of the cylinder barrel will be unevenly worn or longitudinally scratched. When there are scratches on the inner wall of the cylinder barrel, it will directly affect the sealing of the hydraulic cylinder, and even cause oil leakage. Directly replacing the hydraulic cylinder will cause waste to a certain extent, and the inner wall of the cylinder body needs to be polished and cleaned.

[0003] The prior art of application number CN202210498355.2 discloses a hydraulic oil cylinder inner wall polishing device. The outer side wall of the hydraulic oil cylinder can be clamped by the setting and cooperation of the electric push rod, the pressing plate and the placing plate, so as to prevent the hydraulic oil cylinder from moving during polishing. Then, the four polishing heads rotate to polish the inner wall of the hydraulic oil cylinder. However, in the specific use process, the positioning assembly only positions the two sides of the hydraulic oil cylinder, and the oil cylinder may still move during repair and polishing, affecting the polishing and repair effect of the polishing head on the inner wall of the cylinder body. Moreover, the device cannot be applied to the polishing of cylinder bodies of different sizes. Before polishing and repairing the cylinder bodies of different sizes, the height of the rotating shaft needs to be adjusted manually multiple times, and finally the rotating shaft and the central axis of the cylinder body are in the same straight line. The operation is relatively complicated, and the repair efficiency is low. SUMMARY

[0004] The present application aims to solve the problems existing in the prior art and provides a large hydraulic grab ship hydraulic oil cylinder repair device and method.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A large hydraulic grab ship hydraulic oil cylinder repair device, comprising a base, further comprising:

[0007] A moving assembly is arranged on the base and is used to drive the polishing part to move;

[0008] An arc-shaped support seat is fixedly arranged on the base and is used to support the cylinder body;

[0009] A positioning assembly is arranged on the side of the arc-shaped support seat and is used to clamp and position the cylinder body; and

[0010] The self-adjusting coaxial assembly is connected with a polishing part and a positioning assembly on both sides, and is used for coaxially arranging the polishing part and the cylinder.

[0011] Preferably, the moving assembly comprises a moving motor fixed in the base, a screw rod connected with the output end of the moving motor and arranged on the base in rotation, and a sleeve threadedly connected with the screw rod, and the polishing part is fixed on the sleeve.

[0012] Preferably, the polishing part comprises a first telescopic plate fixed with the sleeve, a connecting seat arranged on the first telescopic plate, a polishing motor fixed in the connecting seat, a driving shaft connected with the output end of the polishing motor, and polishing pieces arranged on the driving shaft in a uniform circumferential manner.

[0013] Preferably, the polishing piece comprises a first elastic telescopic rod fixed with the driving shaft, a polishing plate connected with the first elastic telescopic rod away from the driving shaft, and a guide plate arranged at the end of the polishing plate.

[0014] Preferably, the positioning assembly comprises a screw rod rotatably connected with the base, a lifting plate threadedly connected with the screw rod, and a downward-pressing arc-shaped plate rotatably connected with the lifting plate through a pin shaft, and a torsion spring is sleeved on the pin shaft and used for resetting the rotation of the downward-pressing arc-shaped plate.

[0015] Preferably, the self-adjusting coaxial assembly comprises a second telescopic plate fixed on the connecting seat, a guide rod connected with the telescopic end of the second telescopic plate, and a first connecting plate and a second connecting plate rotatably connected on both sides of the guide rod, one end of the first connecting plate away from the guide rod is movably connected with a fixed plate, the fixed plate is fixedly connected with the arc-shaped support seat and horizontally tangent to the inner side wall of the arc-shaped support seat, one end of the second connecting plate away from the guide rod is movably connected with the lifting plate, and the lifting plate is horizontally tangent to the inner wall of the downward-pressing arc-shaped plate.

[0016] Preferably, two sliding grooves are formed in the base, and a sliding block movably abutting against the cylinder is slidably connected in each sliding groove, a second elastic telescopic rod is arranged between the sliding block and the inner wall of the sliding groove, and a limiting block movably abutting against the cylinder is fixed on the top of the sliding block.

[0017] Preferably, a movable plate is fixed on the outer side of the sliding block, a plurality of insertion holes are uniformly formed in the movable plate, a moving block is threadedly connected with the screw rod, and an insertion strip is fixed on the bottom of the moving block and matched with the insertion hole.

[0018] Preferably, a knob is fixed on the top of the screw rod, and a limiting rod is fixed on the base and slidably arranged with the moving block.

[0019] The application discloses a repairing method for a large hydraulic grab ship hydraulic oil cylinder, and discloses a repairing device for the large hydraulic grab ship hydraulic oil cylinder.

[0020] S1: Move the cylinder to be repaired to the arc-shaped support seat of the base, and the cylinder exerts force on the lower arc-shaped plate during the process of lowering the cylinder, so that the lower arc-shaped plate rotates around the pin shaft as the center, and the lower arc-shaped plate is reset to rotate at the pin shaft under the action of the torsion spring as the cylinder passes the lower arc-shaped plate, and when the cylinder approaches the arc-shaped support seat, the bottom of the cylinder on both sides abuts against the inclined surface of the limiting block, so that the limiting block moves along the length direction of the cylinder until the cylinder is lowered on the arc-shaped support seat, and at this time, the bottom of the cylinder on both ends abuts against the limiting block;

[0021] S2: Then rotate the knob to drive the screw rod to rotate, and the screw rod drives the lifting plate and the moving block to move downward, so that the insertion bar at the bottom of the moving block is inserted into the insertion hole of the movable plate, the position of the limiting block is locked, and the cylinder on both ends is limited, and with the continuous rotation of the screw rod, the lifting plate drives the lower arc-shaped plate to abut against the top side wall of the cylinder, and the cylinder is further positioned and limited;

[0022] S3: During the downward movement of the lifting plate, the lifting plate drives the second connecting plate to move downward, the second connecting plate drives the first connecting plate to move through the guide rod, so that the first connecting plate adjusts the height of the polishing part through the second telescopic plate, and the polishing part automatically adjusts the position and is coaxially arranged with the cylinder;

[0023] S4: Then control the moving assembly to work, so that the lead screw rotates when the moving motor operates, and the outer sleeve drives the polishing part to move towards the cylinder, and with the movement of the polishing part towards the inside of the cylinder, the guide plate abuts against the inner side wall of the cylinder, the guide plate is driven to drive the polishing plate to extrude the first elastic telescopic rod, so that the polishing plate moves close to the driving shaft and finally abuts against the inner wall of the cylinder, and by controlling the operation of the polishing motor, the output end of the polishing motor drives the polishing part to polish and repair the inner side wall of the cylinder through the driving shaft.

[0024] Compared with the prior art, the present application provides a large hydraulic grab ship hydraulic oil cylinder repair device and method, which has the following advantages:

[0025] 1、The large hydraulic grab ship hydraulic oil cylinder repair device and method, through the positioning assembly, the polishing part is automatically adjusted coaxially with the cylinder during the limiting and fixing of the cylinder, so that the device is suitable for repairing hydraulic oil cylinders of different sizes, the complicated coaxial adjustment steps are reduced, and the oil cylinder repair efficiency is effectively improved.

[0026] 2. The repair device and method for the hydraulic cylinder of this large hydraulic grab boat involves rotating a knob to drive a screw to rotate. As the screw rotates, it causes a lifting plate and a moving block to move downwards, allowing the insert at the bottom of the moving block to engage with the insertion hole in the movable plate, thus locking the position of the limit block and limiting the cylinder's ends. As the screw continues to rotate, the lifting plate causes a downward-pressing arc plate to abut against the top side wall of the cylinder, further restricting and positioning the cylinder. This multi-directional fixation of the cylinder prevents movement during repair and grinding, ensuring the repair effect on the hydraulic cylinder body. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 For the present invention Figure 1 The left view;

[0029] Figure 3 This is a schematic diagram of the structure of the moving component and the grinding part of the present invention;

[0030] Figure 4 This is a partial cross-sectional view of the base of the present invention. Figure 1 ;

[0031] Figure 5 For the present invention Figure 4 A partially enlarged structural diagram of section A in the middle;

[0032] Figure 6 For the present invention Figure 4 A partially enlarged structural diagram of section B in the middle;

[0033] Figure 7 This is a partial cross-sectional view of the base of the present invention. Figure 2 .

[0034] In the diagram: 1. Base; 2. Moving component; 201. Moving motor; 202. Lead screw; 203. Sleeve; 3. Arc-shaped support seat; 4. Grinding section; 401. First telescopic plate; 402. Connecting seat; 403. Grinding motor; 404. Drive shaft; 405. Grinding component; 4051. First elastic telescopic rod; 4052. Grinding plate; 4053. Guide plate; 5. Cylinder; 6. Positioning component; 601 6011 Screw; 602 Knob; 603 Lifting plate; 604 Pressing down arc plate; 7. Second telescopic plate; 701 Guide rod; 7011 First connecting plate; 7012 Second connecting plate; 8. Fixed plate; 9. Sliding groove; 901 Slider; 902 Second elastic telescopic rod; 903 Limiting block; 10. Movable plate; 1001 Insertion hole; 11. Moving block; 111 Insert strip; 12. Limiting rod. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Example: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 A repair device for the hydraulic cylinder of a large hydraulic grab boat, comprising a base 1, and further comprising:

[0039] Movable component 2 is mounted on base 1 and is used to drive the grinding part 4 to move.

[0040] Arc-shaped support 3 is fixed on the base 1 and is used to support the cylinder body 5;

[0041] Positioning component 6, located on the side of the arc-shaped support 3, is used to clamp the positioning cylinder 5; and

[0042] The self-adjusting coaxial assembly has a grinding part 4 and a positioning component 6 connected to its two sides, which are used to coaxially set the grinding part 4 and the cylinder body 5.

[0043] Specifically, the cylinder body 5 to be repaired is moved onto the arc-shaped support seat 3 of the base 1. Then, the positioning component 6 limits and fixes the cylinder body 5 while automatically adjusting the grinding part 4 to be coaxial with the cylinder body 5. This makes the device suitable for repairing hydraulic cylinders of different sizes, reducing the tedious coaxial adjustment steps for workers and effectively improving the efficiency of cylinder repair. Then, the moving component 2 is controlled to drive the grinding part 4 to perform grinding and repair work on the inner wall of the cylinder body 5.

[0044] Reference Figure 1 , Figure 2 and Figure 3 As a preferred technical solution of the present invention, the moving component 2 includes a moving motor 201 fixed in the base 1, a lead screw 202 connected to the output end of the moving motor 201 and rotatably mounted on the base 1, and a sleeve 203 threadedly connected to the lead screw 202. The grinding part 4 is fixed on the sleeve 203. Specifically, when the moving component 2 is working, it controls the moving motor 201 to run. The output end of the moving motor 201 drives the lead screw 202 to rotate. When the lead screw 202 rotates, the outer sleeve 203 drives the grinding part 4 to move towards the cylinder 5, so that the grinding part 4 performs grinding and repair work on the inner wall of the cylinder 5 along the length direction of the cylinder 5.

[0045] Reference Figure 1 , Figure 2 and Figure 3 As a preferred technical solution of the present invention, the grinding part 4 includes a first telescopic plate 401 fixedly connected to the sleeve 203, a connecting seat 402 disposed on the first telescopic plate 401, a grinding motor 403 fixedly disposed in the connecting seat 402, a drive shaft 404 connected to the output end of the grinding motor 403, and grinding parts 405 uniformly disposed on the drive shaft 404 in a circular pattern.

[0046] Furthermore, the grinding component 405 includes a first elastic telescopic rod 4051 fixedly connected to the drive shaft 404, a grinding plate 4052 connected to the end of the first elastic telescopic rod 4051 away from the drive shaft 404, and a guide plate 4053 disposed at the end of the grinding plate 4052.

[0047] Specifically, the grinding part 4 moves along the length of the cylinder 5 under the action of the moving component 2. As the grinding part 4 moves into the cylinder 5, the guide plate 4053 abuts against the inner wall of the cylinder 5. The guide plate 4053 is forced to drive the grinding plate 4052 to press the first elastic telescopic rod 4051, so that the grinding plate 4052 moves closer to the drive shaft 404 and finally abuts against the inner wall of the cylinder 5. By controlling the operation of the grinding motor 403, the output end of the grinding motor 403 drives the grinding part 405 to grind and repair the inner wall of the cylinder 5 through the drive shaft 404.

[0048] Reference Figure 1 , Figure 2 , Figure 4 ,Figure 5 and Figure 7 As a preferred technical solution of the present invention, the positioning component 6 includes a screw 601 rotatably connected to the base 1, a lifting plate 602 threadedly connected to the screw 601, and a pressing arc plate 603 rotatably connected to the lifting plate 602 via a pin. A torsion spring for resetting the pressing arc plate 603 is sleeved on the pin.

[0049] Specifically, the cylinder body 5 to be repaired is moved onto the arc-shaped support 3 of the base 1. During the lowering process of the cylinder body 5, the cylinder body 5 exerts a force on the lower arc-shaped plate 603, causing the lower arc-shaped plate 603 to rotate around the pin. As the cylinder body 5 passes over the lower arc-shaped plate 603, the lower arc-shaped plate 603 returns to its original rotation due to the force of the torsion spring at the pin. When the cylinder body 5 is lowered onto the arc-shaped support 3, the knob 6011 is turned, causing the knob 6011 to drive the screw 601 to rotate. When the screw 601 rotates, it drives the lifting plate 602 to move down. The lifting plate 602 causes the lower arc-shaped plate 603 to abut against the top side wall of the cylinder body 5, thereby achieving the restricted positioning of the cylinder body 5, preventing the cylinder body 5 from moving during the repair and grinding process, and ensuring the grinding and repair effect of the cylinder body 5.

[0050] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As a preferred technical solution of the present invention, the self-adjusting coaxial assembly includes a second telescopic plate 7 fixed on the connecting seat 402, a guide rod 701 connected to the telescopic end of the second telescopic plate 7, and a first connecting plate 7011 and a second connecting plate 7012 rotatably connected to both sides of the guide rod 701. A fixed plate 8 is movably connected to the end of the first connecting plate 7011 away from the guide rod 701. The fixed plate 8 is fixedly connected to the arc-shaped support seat 3 and is horizontally tangent to the inner sidewall of the arc-shaped support seat 3. The end of the second connecting plate 7012 away from the guide rod 701 is movably connected to the lifting plate 602. The lifting plate 602 is horizontally tangent to the inner wall of the pressing arc-shaped plate 603.

[0051] Specifically, when the positioning component 6 positions the cylinder 5, the lifting plate 602 moves the second connecting plate 7012 downward. The second connecting plate 7012 moves the first connecting plate 7011 through the guide rod 701, so that the first connecting plate 7011 adjusts the height of the grinding part 4 through the second telescopic plate 7, so that the grinding part 4 automatically adjusts its position and is coaxial with the cylinder 5, reducing the tedious coaxial adjustment steps of the workers and effectively improving the efficiency of cylinder repair.

[0052] Reference Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7As a preferred technical solution of the present invention, the base 1 has two sliding grooves 9, and each sliding groove 9 has a slider 901 that moves against the cylinder 5. A second elastic telescopic rod 902 is provided between the slider 901 and the inner wall of the sliding groove 9. A limiting block 903 that moves against the cylinder 5 is fixed on the top of the slider 901.

[0053] Furthermore, a movable plate 10 is fixedly provided on the outer side of the slider 901. A plurality of insertion holes 1001 are evenly provided on the movable plate 10. A movable block 11 is threadedly connected to the screw 601. An insertion strip 111 that mates with the insertion hole 1001 is fixedly provided at the bottom of the movable block 11.

[0054] Specifically, the cylinder body 5 to be repaired is moved onto the arc-shaped support 3 of the base 1. During the lowering process of the cylinder body 5, the cylinder body 5 exerts a force on the downward-pressing arc-shaped plate 603, causing the downward-pressing arc-shaped plate 603 to rotate around the pin. As the cylinder body 5 passes the downward-pressing arc-shaped plate 603, the downward-pressing arc-shaped plate 603 returns to its original rotation due to the force of the torsion spring at the pin. When the cylinder body 5 approaches the arc-shaped support 3, its bottom sides abut against the inclined surfaces of the limiting blocks 903, causing the limiting blocks 903 to move along the length direction of the cylinder body 5 until the cylinder body 5 is lowered onto the arc-shaped support 3. At this time, the bottom ends of the cylinder body 5 abut against the limiting blocks 903. Then, by rotating... Knob 6011 is turned so that screw 601 rotates. When screw 601 rotates, it causes lifting plate 602 and moving block 11 to move down, so that the insert 111 at the bottom of moving block 11 is inserted into the insertion hole 1001 of movable plate 10, thereby locking the position of limit block 903 and limiting the two ends of cylinder body 5. As screw 601 continues to rotate, lifting plate 602 causes downward pressing arc plate 603 to abut against the top side wall of cylinder body 5, thereby further limiting and positioning cylinder body 5, thus fixing cylinder body 5 in multiple directions, preventing hydraulic cylinder from moving during repair and grinding, and ensuring the repair effect of hydraulic cylinder body 5.

[0055] Reference Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7 As a preferred technical solution of the present invention, a knob 6011 is fixedly provided on the top of the screw 601, and a limiting rod 12 that is slidably disposed with the moving block 11 is fixedly provided on the base 1; specifically, a knob 6011 is provided at the end of the screw 601 to facilitate the rotation of the screw 601, and a limiting rod 12 is provided on the base 1 to prevent the moving block 11 and the lifting plate 602 from rotating with the screw 601, thereby improving the stability of the movement of the moving block 11 and the lifting plate 602.

[0056] This invention also discloses a method for repairing the hydraulic cylinder of a large hydraulic grab boat, including the aforementioned repair device for the hydraulic cylinder of a large hydraulic grab boat, and further comprising the following steps:

[0057] S1: Move the cylinder 5 to be repaired onto the arc-shaped support 3 of the base 1. During the process of lowering the cylinder 5, the cylinder 5 exerts a force on the lower arc plate 603, causing the lower arc plate 603 to rotate around the pin. As the cylinder 5 passes the lower arc plate 603, the lower arc plate 603 rotates back to its original position due to the force of the torsion spring at the pin. When the cylinder 5 approaches the arc-shaped support 3, the bottom of both sides of the cylinder 5 abuts against the inclined surface of the limiting block 903, causing the limiting blocks 903 on both sides to move along the length direction of the cylinder 5 until the cylinder 5 is placed on the arc-shaped support 3. At this time, the bottom of both ends of the cylinder 5 abuts against the limiting block 903.

[0058] S2: Then, by rotating the knob 6011, the knob 6011 drives the screw 601 to rotate. When the screw 601 rotates, it drives the lifting plate 602 and the moving block 11 to move down, so that the insert 111 at the bottom of the moving block 11 is inserted into the insertion hole 1001 of the movable plate 10, thereby locking the position of the limiting block 903 and limiting the two ends of the cylinder 5. As the screw 601 continues to rotate, the lifting plate 602 drives the downward pressing arc plate 603 to abut against the top side wall of the cylinder 5, thereby further limiting and positioning the cylinder 5.

[0059] S3: During the downward movement of the lifting plate 602, the lifting plate 602 drives the second connecting plate 7012 to move downward. The second connecting plate 7012 drives the first connecting plate 7011 to move through the guide rod 701, so that the first connecting plate 7011 adjusts the height of the grinding part 4 through the second telescopic plate 7, so that the grinding part 4 automatically adjusts its position and is coaxially set with the cylinder 5.

[0060] S4: Then control the moving component 2 to work, so that the moving motor 201 drives the lead screw 202 to rotate. When the lead screw 202 rotates, the outer sleeve 203 drives the grinding part 4 to move towards the cylinder 5. As the grinding part 4 moves into the cylinder 5, the guide plate 4053 abuts against the inner wall of the cylinder 5. The guide plate 4053 is forced to drive the grinding plate 4052 to press the first elastic telescopic rod 4051, so that the grinding plate 4052 moves closer to the drive shaft 404 and finally abuts against the inner wall of the cylinder 5. By controlling the operation of the grinding motor 403, the output end of the grinding motor 403 drives the grinding part 405 to grind and repair the inner wall of the cylinder 5 through the drive shaft 404.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A repair device for hydraulic cylinders of a large hydraulic grab boat, comprising a base (1), characterized in that, Also includes: A movable component (2) is disposed on a base (1) and is used to drive the grinding part (4) to move. Arc-shaped support base (3), which is fixed on the base (1) and is used to support the cylinder body (5); Positioning component (6), which is disposed on the side of the arc-shaped support base (3) for clamping the positioning cylinder (5); and The self-adjusting coaxial assembly has a grinding part (4) and a positioning part (6) connected to its two sides respectively, for coaxially setting the grinding part (4) and the cylinder (5). The moving component (2) includes a moving motor (201) fixed in the base (1), a lead screw (202) connected to the output end of the moving motor (201) and rotatably mounted on the base (1), and a sleeve (203) threaded onto the lead screw (202). The grinding part (4) is fixed on the sleeve (203). The grinding section (4) includes a first telescopic plate (401) fixedly connected to the sleeve (203), a connecting seat (402) provided on the first telescopic plate (401), a grinding motor (403) fixedly provided in the connecting seat (402), a drive shaft (404) connected to the output end of the grinding motor (403), and grinding parts (405) uniformly arranged on the drive shaft (404) in a circular pattern. The positioning component (6) includes a screw (601) rotatably connected to the base (1), a lifting plate (602) threadedly connected to the screw (601), and a pressing arc plate (603) rotatably connected to the lifting plate (602) via a pin. A torsion spring for resetting the pressing arc plate (603) is sleeved on the pin. The self-adjusting coaxial assembly includes a second telescopic plate (7) fixed on the connecting seat (402), a guide rod (701) connected to the telescopic end of the second telescopic plate (7), and a first connecting plate (7011) and a second connecting plate (7012) rotatably connected to both sides of the guide rod (701). The first connecting plate (7011) is movably connected to a fixed plate (8) at one end away from the guide rod (701). The fixed plate (8) is fixedly connected to the arc-shaped support seat (3) and is horizontally tangent to the inner wall of the arc-shaped support seat (3). The second connecting plate (7012) is movably connected to a lifting plate (602) at one end away from the guide rod (701). The lifting plate (602) is horizontally tangent to the inner wall of the pressing arc-shaped plate (603).

2. The repair device for the hydraulic cylinder of a large hydraulic grab boat according to claim 1, characterized in that, The grinding component (405) includes a first elastic telescopic rod (4051) fixedly connected to the drive shaft (404), a grinding plate (4052) connected to the end of the first elastic telescopic rod (4051) away from the drive shaft (404), and a guide plate (4053) disposed at the end of the grinding plate (4052).

3. The repair device for the hydraulic cylinder of a large hydraulic grab boat according to claim 2, characterized in that, The base (1) has two sliding grooves (9), and each sliding groove (9) is slidably connected to a slider (901) that moves against the cylinder (5). A second elastic telescopic rod (902) is provided between the slider (901) and the inner wall of the sliding groove (9). A limiting block (903) that moves against the cylinder (5) is fixed on the top of the slider (901).

4. The repair device for the hydraulic cylinder of a large hydraulic grab boat according to claim 3, characterized in that, A movable plate (10) is fixedly provided on the outside of the slider (901). A plurality of insertion holes (1001) are evenly provided on the movable plate (10). A movable block (11) is threadedly connected to the screw (601). An insertion strip (111) that cooperates with the insertion hole (1001) is fixedly provided at the bottom of the movable block (11).

5. A repair device for the hydraulic cylinder of a large hydraulic grab boat according to claim 4, characterized in that, A knob (6011) is fixedly provided on the top of the screw (601), and a limiting rod (12) is fixedly provided on the base (1) and slidably disposed with the moving block (11).

6. A method for repairing the hydraulic cylinder of a large hydraulic grab boat, comprising the repair device for the hydraulic cylinder of a large hydraulic grab boat as described in claim 5, characterized in that, It also includes the following steps: S1: Move the cylinder (5) to be repaired to the arc support seat (3) of the base (1). During the process of lowering the cylinder (5), the cylinder (5) exerts a force on the lower arc plate (603), causing the lower arc plate (603) to rotate around the pin. As the cylinder (5) passes the lower arc plate (603), the lower arc plate (603) rotates at the pin due to the force of the torsion spring. When the cylinder (5) approaches the arc support seat (3), the bottom of both sides of the cylinder (5) abuts against the inclined surface of the limit block (903), causing the limit blocks (903) on both sides to move along the length direction of the cylinder (5) until the cylinder (5) is placed on the arc support seat (3). At this time, the bottom of both ends of the cylinder (5) abuts against the limit block (903). S2: Then, by rotating the knob (6011), the knob (6011) drives the screw (601) to rotate. When the screw (601) rotates, it drives the lifting plate (602) and the moving block (11) to move down, so that the insert (111) at the bottom of the moving block (11) is inserted into the insertion hole (1001) of the movable plate (10), thereby locking the position of the limiting block (903) and limiting the two ends of the cylinder (5). As the screw (601) continues to rotate, the lifting plate (602) drives the lowering arc plate (603) to abut against the top side wall of the cylinder (5), thereby further limiting and positioning the cylinder (5). S3: During the downward movement of the lifting plate (602), the lifting plate (602) drives the second connecting plate (7012) to move downward. The second connecting plate (7012) drives the first connecting plate (7011) to move through the guide rod (701), so that the first connecting plate (7011) adjusts the height of the grinding part (4) through the second telescopic plate (7), so that the grinding part (4) automatically adjusts its position and is coaxially set with the cylinder (5); S4: Then control the moving component (2) to work, so that the moving motor (201) drives the lead screw (202) to rotate. When the lead screw (202) rotates, the outer sleeve (203) drives the grinding part (4) to move towards the cylinder (5). As the grinding part (4) moves into the cylinder (5), the guide plate (4053) abuts against the inner wall of the cylinder (5). The guide plate (4053) is forced to drive the grinding plate (4052) to squeeze the first elastic telescopic rod (4051), so that the grinding plate (4052) moves closer to the drive shaft (404) and finally abuts against the inner wall of the cylinder (5). By controlling the grinding motor (403) to run, the output end of the grinding motor (403) drives the grinding part (405) to grind and repair the inner wall of the cylinder (5) through the drive shaft (404).

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