Double-layer thin-wall cylinder surface correction device and method

Abstract

The present invention discloses a device and method for correcting the profile of a double-layer thin-walled cylinder. A clamping block and a supporting block are arranged relative to each other, and a connecting arm is U-shaped. One end of the connecting arm is fixedly connected to the clamping block, and the other end of the connecting arm is fixedly connected to the supporting block. The profile of the clamping block near the supporting block is adapted to the outer profile of the double-layer thin-walled cylinder, and the profile of the supporting block near the clamping block is adapted to the inner profile of the double-layer thin-walled cylinder. The clamping block and the connecting arm are connected by a first adjustment mechanism, and the first adjustment mechanism is used to adjust the distance between the clamping block and the supporting block. The adjusting clamping block is provided with an observation hole, and the supporting block is provided with a magnetic ring, and the center of the observation hole is located on the axis of the magnetic ring. The pad assembly includes a hydraulic cylinder and a magnetic block, and the inlet of the hydraulic cylinder is connected to a pipeline assembly, and the pipeline assembly is flexible. The magnetic block is installed at the bottom of the hydraulic cylinder, and the axis of the magnetic block is coaxial with the piston of the hydraulic cylinder. The present invention has a good effect on correcting the profile of the double-layer thin-walled cylinder and can avoid damage to the double-layer thin-walled cylinder.

Description

Technical Field

[0001] The invention belongs to the field of aviation engine parts manufacturing, and relates to a double-layer thin-wall cylinder surface correction device and method. Background Art

[0002] The double-walled cylinder, a component of an aircraft engine's tail nozzle, features a welded double-walled structure at the front end. To enhance the cooling effect of the double-walled surface, eight 9mm pores are evenly distributed on the outer surface of the double-walled cylinder, allowing external airflow to enter and cool the double-walled cylinder. The double-walled surface is only 1mm thick, making it susceptible to deformation and denting due to external forces during assembly, disassembly, and transportation. Due to the complex machining process and long production cycle, reworking the cylinder has a significant impact on on-site production tasks. Furthermore, the double-walled cylinder is essentially a closed-loop cavity structure, making surface deformation extremely difficult to repair, severely impacting product quality and production schedules. Currently, the primary method for repairing dented and deformed double-walled cylinders on-site is to insert a small pry bar into the 9mm pores on the outer wall and use the pore edges as lever arms to correct the deformed areas. This correction method cannot correct all deformed parts because there is no special tooling designed. The surface quality of the part after correction is poor, and the pry bar causes certain damage to the pore edge with the help of the pore edge support. If too much force is used, the pore edge will be crushed and collapsed. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a double-layer thin-walled cylinder surface correction device and method. The present invention has a good effect on the double-layer thin-walled cylinder surface correction and can avoid damage to the double-layer thin-walled cylinder.

[0004] The technical solution adopted in the present invention is as follows:

[0005] A double-layer thin-walled cylinder profile correction device includes a clamping block, a support block, a connecting arm, a clamping arm and a spacer assembly, and a pipeline assembly. The clamping block and the support block are arranged relative to each other. The connecting arm is U-shaped, one end of the connecting arm is fixedly connected to the clamping block, and the other end of the connecting arm is fixedly connected to the support block. The profile of the clamping block on the side close to the support block is adapted to the outer profile of the double-layer thin-walled cylinder, and the profile of the support block on the side close to the clamping block is adapted to the inner profile of the double-layer thin-walled cylinder. The clamping block and the connecting arm are connected by a first adjustment mechanism, and the first adjustment mechanism is used to adjust the distance between the clamping block and the support block.

[0006] An observation hole is provided on the adjusting clamping block, and a magnetic ring is provided on the supporting block, and the center of the observation hole is located on the axis of the magnetic ring;

[0007] The pad assembly includes a hydraulic cylinder and a magnetic block. The inlet of the hydraulic cylinder is connected to the pipeline assembly, and the pipeline assembly is flexible. The magnetic block is installed at the bottom of the hydraulic cylinder, and the axis of the magnetic block is coaxial with the piston of the hydraulic cylinder.

[0008] Preferably, the first adjustment mechanism includes a nut and a screw, the screw passes through the connecting arm and is threadedly connected to the connecting arm, one end of the screw is rotationally connected to the clamping block, and the other end of the screw is fixedly connected to the nut.

[0009] Preferably, the observation hole is a tapered hole, with the small end of the tapered hole facing the center of the magnetic ring.

[0010] Preferably, the profile of the support block close to the clamping block is provided with a concave embedding groove, the magnetic ring is embedded in the embedding groove, and the magnetic ring does not protrude from the profile of the support block close to the clamping block.

[0011] Preferably, the inner cavity of the cylinder body of the hydraulic cylinder is divided into a first chamber and a second chamber by a partition. A chuck is provided in the first chamber, and the chuck serves as the hydraulic cylinder piston. A sealing ring is provided on the chuck for sealing with the first chamber. One end of the chuck is located in the first chamber, and the other end of the chuck extends out of the cylinder body. A liquid inlet is provided on the partition, and the liquid inlet serves as the inlet of the hydraulic cylinder. A side opening for the pipeline assembly to extend into is provided on the side wall of the second chamber, and the magnetic block is arranged at the bottom of the second chamber.

[0012] Preferably, the cylinder body of the hydraulic cylinder adopts a split structure, and the cylinder body is divided into a clamping arm and a pad with the bottom of the partition as the boundary;

[0013] The clamping arm serves as the outer shell of the first chamber, the bottom of the partition is located on the clamping arm, the side opening is opened on the pad, and the magnetic block is arranged on the pad.

[0014] Preferably, the side opening extends from the surface of the pad to the interior of the pad, and grooves are provided on the two side walls of the side opening, and the grooves extend from the surface of the pad to the interior of the pad. The surface of the portion of the pipeline assembly extending into the side opening is provided with a boss that matches the groove, and the portion of the pipeline assembly extending into the side opening can be extended into or pulled out of the side opening and can be limited by the cooperation of the groove and the boss.

[0015] Preferably, the pipeline assembly includes a pipe and a pipe joint, the pipe is flexible, one end of the pipe joint is connected to the pipe, and the other end of the pipe joint is connected to the liquid inlet. The boss is arranged on the pipe joint.

[0016] Preferably, the double-layer thin-walled cylinder profile correction device of the present invention also includes a traction rope, which is arranged along the pipe. The pipe is provided with a plurality of wire clamps for limiting the traction rope at intervals along its length direction. The traction rope can move within the wire clamp, and one end of the traction rope extends to the pipe joint and is fixedly connected to the pad.

[0017] The present invention also provides a double-layer thin-walled cylinder surface correction method, which is performed using the double-layer thin-walled cylinder surface correction device of the present invention, and includes the following steps:

[0018] The portion of the double-layer thin-walled cylinder to be corrected is placed on the clamping block and the supporting block, and the distance between the clamping block and the supporting block is adjusted by the first adjusting mechanism. During the adjustment process, the deformation position on the double-layer thin-walled cylinder is observed through the observation hole, and the center of the observation hole is aligned with the deformation position. The distance between the clamping block and the supporting block is continuously adjusted by the first adjusting mechanism until the profile of the clamping block fits the outer profile of the double-layer thin-walled cylinder and the profile of the supporting block fits the inner profile of the double-layer thin-walled cylinder;

[0019] The spacer assembly is sent from the air hole on the double-layer thin-walled cylinder into the annular cavity of the double-layer thin-walled cylinder through the pipeline assembly, and the magnetic block is sent into the magnetic attraction range of the magnetic ring. The magnetic ring attracts the magnetic block and positions the magnetic block at the center of the magnetic ring. The first adjustment mechanism is then adjusted to relatively fix the positions of the clamping block, the double-layer thin-walled cylinder, and the support block.

[0020] Then, hydraulic oil is added to the hydraulic cylinder through the pipeline assembly, so that the piston of the hydraulic cylinder pushes the deformed position outward from the annular cavity of the double-layer thin-walled cylinder. During the pushing process, the deformed position is observed through the observation hole. When the deformed position is restored, a correction is completed.

[0021] Repeat the above process to complete the correction of all deformed positions.

[0022] The present invention has the following beneficial effects:

[0023] In the double-layer thin-walled cylinder profile correction device of the present invention, a clamping block and a support block are provided to support the outer profile and the inner profile of the double-layer thin-walled cylinder respectively. Since the profile of the clamping block close to the support block is adapted to the outer profile of the double-layer thin-walled cylinder, and the profile of the support block close to the clamping block is adapted to the inner profile of the double-layer thin-walled cylinder, the clamping block and the support block will not clamp the profile of the double-layer thin-walled cylinder during support. The pad assembly uses a hydraulic cylinder, and the pipeline assembly is connected to the inlet of the hydraulic cylinder; the hydraulic cylinder can be lowered from the air hole on the double-layer thin-walled cylinder to the annular cavity of the double-layer thin-walled cylinder by using a flexible pipeline assembly, and the hydraulic cylinder can be positioned by using a magnetic ring and a magnetic block, so that the hydraulic cylinder is located on the inside of the deformed position, and the axis of the hydraulic cylinder piston, the center of the magnetic block, the axis of the magnetic ring, and the center of the observation hole are coaxial, which ensures that the hydraulic cylinder can accurately repair the deformed part observed through the observation hole. When the hydraulic cylinder is used for repair, the hydraulic pressure is highly controllable and has great strength and stability, so the repair effect is better. The pipeline assembly in the present invention is flexible, and it can also avoid deformation of the air hole edge when the pipeline assembly passes through the air hole on the double-layer thin-walled cylinder, and the present invention does not need to use the air hole of the double-layer thin-walled cylinder as a fulcrum for repair, avoiding the defect of the air hole edge being easily crushed or collapsed during repair in the prior art. In summary, the present invention has a good effect on the correction of the double-layer thin-walled cylinder surface and can avoid damage to the double-layer thin-walled cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the double-layer thin-walled cylinder surface correction device of the present invention.

[0025] Figure 2 Schematic diagram of the clamping arm and pad assembly in an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of a pipeline assembly in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of a clamping block assembly in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the calibration device in the calibration state according to an embodiment of the present invention (including parts to be calibrated).

[0029] Figure 6 Schematic diagram of the connection between the spacer and the pipe joint in an embodiment of the present invention.

[0030] In the figure, 1-nut; 2-screw; 3-clamp; 3-1-observation hole; 3-2-slide; 4-clamp arm and spacer assembly; 5-support block; 6-magnetic ring; 7-clamp; 8-O-ring; 9-clamp arm; 10-spacer; 10-1-groove; 10-2-side opening; 11-magnetic block; 12-clamp; 13-traction rope; 14-pipe; 15-pipe joint; 15-1-boss; 16-double-layer thin-wall cylinder; 16-1-air hole; 16-2-inner surface; 16-3-outer surface; 17-connecting arm. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] See also Figure 1-Figure 5 The double-layer thin-walled cylinder profile correction device of the present invention includes a clamping block 3, a support block 5, a connecting arm 17, a clamping arm and a pad assembly 4, and a pipeline assembly. The clamping block 3 and the support block 5 are arranged opposite to each other. The connecting arm 17 is U-shaped. One end of the connecting arm 17 is fixedly connected to the clamping block 3, and the other end of the connecting arm 17 is fixedly connected to the support block 5. The profile of the clamping block 3 near the support block 5 is adapted to the outer profile 16-3 of the double-layer thin-walled cylinder 16, and the profile of the support block 5 near the clamping block 3 is adapted to the inner profile 16-2 of the double-layer thin-walled cylinder 16. Adaptation; the clamping block 3 and the connecting arm 17 are connected by a first adjusting mechanism, and the first adjusting mechanism is used to adjust the distance between the clamping block 3 and the support block 5; an observation hole 3-1 is provided on the adjusting clamping block 3, and a magnetic ring 6 is provided on the support block 5, and the center of the observation hole 3-1 is located on the axis of the magnetic ring 6; the pad assembly 4 includes a hydraulic cylinder and a magnetic block 11, the inlet of the hydraulic cylinder is connected to the pipeline assembly, and the pipeline assembly is flexible; the magnetic block 11 is installed at the bottom of the hydraulic cylinder, and the axis of the magnetic block 11 is coaxial with the piston of the hydraulic cylinder.

[0033] The process of correcting the profile of a double-layer thin-walled cylinder by the double-layer thin-walled cylinder profile correction device of the present invention is as follows:

[0034] Combine Figure 5As shown, the part of the double-layer thin-walled cylinder 16 to be corrected is placed on the clamping block 3 and the supporting block 5. The U-shaped connecting arm provides space for the placement of the double-layer thin-walled cylinder 16. At the same time, the U-shaped connecting arm also has a certain elasticity, so that after the clamping block 3 and the supporting block 5 clamp the profile of the double-layer thin-walled cylinder 16, the clamping state is more stable. The overall shape of the connecting arm can be a right-angled U-shape or a rounded U-shape, preferably a rounded U-shape; then the distance between the clamping block 3 and the supporting block 5 is adjusted by the first adjusting mechanism. During the adjustment process, the deformation position on the double-layer thin-walled cylinder 16 is observed through the observation hole 3-1, and the center of the observation hole 3-1 is aligned with the deformation position. The distance between the clamping block 3 and the supporting block 5 is continued to be adjusted by the first adjusting mechanism until the profile of the clamping block 3 is in contact with the outer profile 16-3 of the double-layer thin-walled cylinder 16, and the profile of the supporting block 5 is in contact with the inner profile 16-2 of the double-layer thin-walled cylinder 16;

[0035] Then, the spacer assembly 4 is fed into the annular cavity of the double-layer thin-walled cylinder 16 through the air hole 16-1 on the double-layer thin-walled cylinder 16 through the pipeline assembly, and the magnetic block 11 is fed into the magnetic attraction range of the magnetic ring 6. The magnetic ring 6 attracts the magnetic block 11 and can position the magnetic block 11 at the center of the magnetic ring 6. Then, the first adjustment mechanism is continuously adjusted to relatively fix the positions of the clamping block 3, the double-layer thin-walled cylinder 16, and the support block 5.

[0036] Then, hydraulic oil is added to the hydraulic cylinder through the pipeline assembly, so that the piston of the hydraulic cylinder pushes the deformed position outward from the annular cavity of the double-layer thin-walled cylinder 16. During the pushing process, the deformed position is observed through the observation hole 3-1. When the deformed position is restored, a correction is completed.

[0037] Repeat the above process to complete the correction of all deformed positions.

[0038] The correction device of the present invention is designed through a combination of a clamping arm and a pad, which enables entry into a basically closed narrow annular cavity through a small hole and has the ability to provide a positioning reference; it utilizes a magnetic medium and a tooling structure design to achieve precise positioning and movement of the clamping arm within the annular cavity; and it realizes the correction function of the surface at a specified position through a hydraulic structure design and a clamping block assembly.

[0039] As an optional embodiment of the present invention, see Figure 1 、 Figure 4 and Figure 5 The first adjustment mechanism includes a nut 1 and a screw 2. The screw 2 passes through the connecting arm 17 and is threadedly connected to the connecting arm 17. One end of the screw 2 is rotatably connected to the clamping block 3, and the other end of the screw 2 is fixedly connected to the nut 1. When adjusting the distance between the clamping block 3 and the supporting block 5, it can be achieved by manually tightening the nut 1. The structure is simple and the adjustment is convenient.

[0040] As an optional embodiment of the present invention, see Figure 1、 Figure 4 and Figure 5 The observation hole 3-1 adopts a tapered hole, and the small end of the tapered hole faces the center of the magnetic ring 6. The tapered hole can allow enough light to enter the small end of the observation hole 3-1, making the observation clearer and easier to operate.

[0041] As a preferred embodiment of the present invention, the surface of the support block 5 on the side close to the clamping block 3 is provided with a concave embedding groove, and the magnetic ring 6 is embedded in the embedding groove. The magnetic ring 6 does not protrude from the surface of the support block 5 on the side close to the clamping block 3. The support block 5 with this structure is easy to manufacture and will not cause the support block 5 to clamp the inner surface 16-2.

[0042] As an optional embodiment of the present invention, the inner cavity of the cylinder body of the hydraulic cylinder is divided into a first chamber and a second chamber by a partition. A chuck 7 is provided in the first chamber, which serves as the hydraulic cylinder piston. The chuck 7 is provided with a sealing ring for sealing with the first chamber. One end of the chuck 7 is located in the first chamber, and the other end of the chuck 7 extends out of the cylinder body. A liquid inlet is provided on the partition, which serves as the entrance to the hydraulic cylinder. A side opening 10-2 is provided on the side wall of the second chamber for the pipeline assembly to extend into, and a magnetic block 11 is provided at the bottom of the second chamber. The pipeline assembly extends from the side of the hydraulic cylinder body, ensuring the coaxial arrangement of the chuck 7 and the magnetic block.

[0043] As a preferred embodiment of the present invention, the cylinder body of the hydraulic cylinder adopts a split structure, and the cylinder body is divided into a clamping arm 9 and a pad 10 with the bottom of the partition as the boundary; the clamping arm 9 serves as the outer shell of the first chamber, the bottom of the partition is located on the clamping arm 9, the side opening 10-2 is opened on the pad 10, and the magnetic block 11 is arranged on the pad 10. The pad 10 and the clamping arm 9 are made into this split structure. When the hydraulic cylinder is inserted into or removed from the air hole, the pad 10 and the clamping arm 9 can be separated, and the pad 10 and the clamping arm 9 can be respectively installed in the mold cavity, and then assembled into an integral cylinder structure. Therefore, the overall size of the cylinder body is reduced when the cylinder body is lowered, which facilitates the installation of the hydraulic cylinder.

[0044] As a preferred embodiment of the present invention, see Figure 6 The side opening 10-2 extends from the surface of the cushion block 10 to the interior of the cushion block 10. Grooves 10-1 are formed on both side walls of the side opening 10-2. The grooves 10-1 extend from the surface of the cushion block 10 to the interior of the cushion block 10. The portion of the pipe assembly extending into the side opening 10-2 is provided with a boss 15-1 that matches the groove 10-1. The portion of the pipe assembly extending into the side opening 10-2 can be extended into or withdrawn from the side opening 10-2 and can be limited in position by the cooperation of the groove 10-1 and the boss 15-1. The groove 10-1 and the boss 15-1 ensure convenient installation of the cushion block 10 and the pipe assembly, thereby achieving assembly between the cushion block 10 and the clamp arm 9. The structure is simple and the operability is strong.

[0045] As an optional embodiment of the present invention, the pipeline assembly includes a tube 14 and a pipe joint 15, the tube 14 is flexible, one end of the pipe joint 15 is connected to the tube 14, and the other end of the pipe joint 15 is connected to the liquid inlet. The boss 15-1 is arranged on the pipe joint 15.

[0046] As a preferred embodiment of the present invention, based on the above-mentioned embodiment, the double-layer thin-walled cylinder profile correction device of the present invention further includes a traction rope 13, which is arranged along a tube 14. The tube 14 is provided with a plurality of clamps 12 spaced apart along its length for limiting the traction rope 13. The traction rope 13 is movable within the clamps 12. One end of the traction rope 13 extends to a pipe joint 15 and is fixedly connected to the spacer 10. The traction rope 13 can control the relative position between the spacer 10 and the pipe joint 15, thereby achieving accurate insertion of the pipe joint 15 into the spacer 10.

[0047] It can be seen that the above solution proposed by the present invention effectively solves the current situation that after the surface of a certain double-layer thin-walled cylinder is deformed, it is difficult to correct it, and the surface quality after correction is poor, which affects the product quality.

[0048] Example

[0049] The double-layer thin-walled cylinder surface correction device of this embodiment includes a clamping arm and a pad assembly 4, a pipeline assembly and a clamping block assembly. The overall structure is shown in FIG. Figure 1 The structure of the clamping arm and the pad assembly 4 is as follows: Figure 2 As shown, it includes a chuck 7, an O-ring 8, a clamp arm 9, a pad 10 and a magnetic block 11, which play the role of supporting the inner surface of the ring cavity and applying force outward during the calibration process; the pipeline assembly structure is as shown Figure 3 As shown, it includes a wire clamp 12, a traction rope 13, a pipe 14 and a pipe joint 15, which play the role of installing the pad and the clamp arm combination and conveying hydraulic oil; the clamp assembly structure is shown in Figure 4 , including a nut 1, a screw 2, a clamping block 3, a support block 5 and a magnetic ring 6, which play a role in clamping the correction part and supporting the inner wall of the ring cavity during the correction process.

[0050] The clamp arm and the pad assembly are connected through a pipe assembly. The outlet end of the pipe joint 15 of the pipe assembly is welded to the through hole on the bottom partition of the clamp arm 9, and the other end of the pipe joint 15 is threadedly connected to the pipe port, see Figure 6Two bosses 15-1 are machined on both sides of the pipe joint 15, and the bosses 15-1 cooperate with the grooves 10-1 on both sides of the gasket 10. The pipeline 14 is a hose, and several wire clamps 12 are fixed on its outer surface, which are used to fix the two traction wires 13 distributed outside the pipeline. One end of the traction wire 13 is welded on both sides of the gasket 10, and is used to pull the gasket 10 to be assembled to the bosses on both sides of the pipe joint 15. The chuck 7 is installed in the clamp arm 9, and the O-ring 8 plays a sealing role. A rodless oil chamber is formed between the chuck 7 and the bottom surface of the clamp arm 9. A magnetic ring 6 is fixed on the bottom surface of the support block 5 of the clamp block assembly. A clamp block 3 is installed on the upper end surface of the support block 5 through two screws 2 and two nuts 1. A conical hole is machined in the middle of the clamp block 3 for observing the damage location and correction effect.

[0051] The operation process of the double-layer thin-walled cylinder profile correction device of this embodiment is as follows:

[0052] Parts calibration diagram Figure 5 First, slide the spacer 10 along the boss 10-1 on the pipe assembly, and separate the spacer 10 from the clamp arm 9 by a certain distance. First, place the spacer 10 into the hole on the outer surface of the double-layer annular cavity, and then insert the clamp head 7 of the clamp arm assembly into the hole. While observing near the hole, adjust the pulling rope 13 and install the spacer 10 on the pipe joint of the pipe assembly, completing the combined assembly of the clamp arm 9 and the spacer 10 in the annular cavity.

[0053] Then, the pipeline assembly is extended to the deformed part of the profile, so that the clamp arm and the pad assembly 4 stay near the deformed part, and the clamp assembly is installed so that the bottom surface of the support block 5 is against the inner profile 16-2 of the annular cavity, and the bottom surface of the clamp block 3 is against the outer profile 16-3 of the annular cavity. At this time, the clamp arm and the pad assembly 4 are attracted to the magnetic ring 6 on the support block 5 due to the magnetic force, so that the magnetic block on the bottom surface of the pad 10 is located in the center of the clamp magnetic ring 6, completing the positioning of the clamp arm and the pad assembly relative to the clamp assembly. Then, the deformation position is observed through the tapered hole (i.e., the observation hole 3-1) on the clamp block 3 until it is aligned with the deformation position. The clamp block is tightened against the outer profile of the annular cavity by rotating the screw to complete the fixing of the clamp assembly. At the same time, the clamp arm and the pad assembly move together with the clamp assembly to the deformed part of the profile due to the magnetic force, and ensure the precise alignment of the clamp arm and the pad assembly, the clamp assembly and the deformed part.

[0054] After completing the above operations, lubricating oil at a certain pressure is introduced into the pipeline, causing the chuck to move upward under the pressure, so that the deformed part and the clamping block fit tightly together, thus completing one correction. The position of the clamping block assembly can be adjusted according to the deformation area, and the correction process can be repeated to complete the correction of all deformed parts.

[0055] As can be seen from the above scheme, the present invention cleverly utilizes the combined assembly design of the clamping arm and the spacer to solve the problem of accessing the small hole of the double-layer thin-walled surface. The structural design of the pipeline assembly and the clamping block assembly achieves precise positioning of the correction device, overcomes the design of the tooling structure in a basically closed annular cavity and a narrow space, and realizes the function of surface correction. This reduces the scrapped parts and economic losses caused by the inability to correct the deformation of the double-layer thin-walled cylinder, ensures the quality of the corrected surface, saves processing time, and improves production progress.

Claims

1. A double-layer thin-walled cylinder surface correction device, characterized in that: The invention comprises a clamping block (3), a support block (5), a connecting arm (17), a clamping arm and a spacer assembly (4), and a pipeline assembly. The clamping block (3) and the support block (5) are arranged relative to each other. The connecting arm (17) is U-shaped. One end of the connecting arm (17) is fixedly connected to the clamping block (3), and the other end of the connecting arm (17) is fixedly connected to the support block (5). The profile of the clamping block (3) on the side close to the support block (5) is adapted to the outer profile (16-3) of the double-layer thin-wall cylinder (16), and the profile of the support block (5) on the side close to the clamping block (3) is adapted to the inner profile (16-2) of the double-layer thin-wall cylinder (16). The clamping block (3) and the connecting arm (17) are connected by a first adjustment mechanism. The first adjustment mechanism is used to adjust the distance between the clamping block (3) and the support block (5). An observation hole (3-1) is provided on the adjusting clamping block (3), a magnetic ring (6) is provided on the supporting block (5), and the center of the observation hole (3-1) is located on the axis of the magnetic ring (6); The pad assembly (4) includes a hydraulic cylinder and a magnetic block (11), the inlet of the hydraulic cylinder is connected to the pipeline assembly, and the pipeline assembly is flexible; the magnetic block (11) is installed at the bottom of the hydraulic cylinder, and the axis of the magnetic block (11) is coaxial with the piston of the hydraulic cylinder; The inner cavity of the cylinder body of the hydraulic cylinder is divided into a first chamber and a second chamber by a partition. A chuck (7) is provided in the first chamber, and the chuck (7) serves as a piston of the hydraulic cylinder. A sealing ring for sealing with the first chamber is provided on the chuck (7). One end of the chuck (7) is located in the first chamber, and the other end of the chuck (7) extends out of the cylinder body. A liquid inlet is provided on the partition, and the liquid inlet serves as an inlet of the hydraulic cylinder. A side opening (10-2) for the pipeline assembly to extend into is provided on the side wall of the second chamber, and a magnetic block (11) is provided at the bottom of the second chamber.

2. A double-layer thin-walled cylinder surface correction device according to claim 1, characterized in that: The first adjustment mechanism comprises a nut (1) and a screw (2), wherein the screw (2) passes through the connecting arm (17) and is threadedly connected to the connecting arm (17), one end of the screw (2) is rotationally connected to the clamping block (3), and the other end of the screw (2) is fixedly connected to the nut (1).

3. The double-layer thin-walled cylinder surface correction device according to claim 1, characterized in that: The observation hole (3-1) is a tapered hole, with the small end of the tapered hole facing the center of the magnetic ring (6).

4. A double-layer thin-walled cylinder surface correction device according to claim 1, characterized in that: A concave embedding groove is provided on the profile of the support block (5) on the side close to the clamping block (3), and the magnetic ring (6) is embedded in the embedding groove. The magnetic ring (6) does not protrude from the profile of the support block (5) on the side close to the clamping block (3).

5. The double-layer thin-walled cylinder surface correction device according to claim 1, characterized in that: The cylinder body of the hydraulic cylinder adopts a split structure, and the cylinder body is divided into a clamping arm (9) and a pad (10) with the bottom of the partition as the boundary; The clamping arm (9) serves as the outer shell of the first chamber, the partition bottom is located on the clamping arm (9), the side opening (10-2) is opened on the pad (10), and the magnetic block (11) is arranged on the pad (10).

6. A double-layer thin-walled cylinder surface correction device according to claim 5, characterized in that: The side opening (10-2) extends from the surface of the cushion block (10) toward the interior of the cushion block (10), grooves (10-1) are provided on both side walls of the side opening (10-2), the grooves (10-1) extend from the surface of the cushion block (10) toward the interior of the cushion block (10), a boss (15-1) adapted to the groove (10-1) is provided on the surface of the portion of the pipe assembly extending into the side opening (10-2), and the portion of the pipe assembly extending into the side opening (10-2) can be extended into or withdrawn from the side opening (10-2) and can be limited by the cooperation of the groove (10-1) and the boss (15-1).

7. A double-layer thin-walled cylinder surface correction device according to claim 6, characterized in that: The pipeline assembly comprises a tube (14) and a tube joint (15); the tube (14) is flexible; one end of the tube joint (15) is connected to the tube (14); the other end of the tube joint (15) is connected to the liquid inlet; and the boss (15-1) is arranged on the tube joint (15).

8. The double-layer thin-walled cylinder surface correction device according to claim 7, characterized in that: The device further comprises a traction rope (13), which is arranged along the tube (14). The tube (14) is provided with a plurality of wire clamps (12) for limiting the traction rope (13) at intervals along its length direction. The traction rope (13) is movable within the wire clamps (12). One end of the traction rope (13) extends to the pipe joint (15) and is fixedly connected to the pad (10).

9. A method for correcting the profile of a double-layer thin-walled cylinder, characterized in that: The double-layer thin-walled cylinder surface correction device according to any one of claims 1 to 8 is used, and the process includes the following steps: The portion of the double-layer thin-walled cylinder (16) to be corrected is placed on the clamping block (3) and the supporting block (5), and the distance between the clamping block (3) and the supporting block (5) is adjusted by the first adjusting mechanism. During the adjustment process, the deformation position on the double-layer thin-walled cylinder (16) is observed through the observation hole (3-1), and the center of the observation hole (3-1) is aligned with the deformation position. The distance between the clamping block (3) and the supporting block (5) is continuously adjusted by the first adjusting mechanism until the profile of the clamping block (3) is in contact with the outer profile (16-3) of the double-layer thin-walled cylinder (16), and the profile of the supporting block (5) is in contact with the inner profile (16-2) of the double-layer thin-walled cylinder (16); The spacer assembly (4) is fed from the air hole (16-1) on the double-layer thin-walled cylinder (16) into the annular cavity of the double-layer thin-walled cylinder (16) through the pipeline assembly, and the magnetic block (11) is fed into the magnetic adsorption range of the magnetic ring (6), and the magnetic ring (6) adsorbs the magnetic block (11) and makes the magnetic block (11) be located at the center of the magnetic ring (6); then the first adjustment mechanism is continuously adjusted to make the positions of the clamping block (3), the double-layer thin-walled cylinder (16) and the support block (5) relatively fixed; Then, hydraulic oil is added to the hydraulic cylinder through the pipeline assembly, so that the piston of the hydraulic cylinder pushes the deformed position outward from the annular cavity of the double-layer thin-walled cylinder (16). During the pushing process, the deformed position is observed through the observation hole (3-1). When the deformed position is restored, a correction is completed; Repeat the above process to complete the correction of all deformed positions.

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