Manhole cover maintaining and trimming device for municipal engineering

Abstract

The invention discloses a manhole cover maintaining and trimming device for municipal engineering, and relates to the technical field of manhole cover trimming and grinding, the manhole cover maintaining and trimming device comprises a trimming table arranged on the top of the ground; the trimming frame is fixedly mounted on the front wall and the rear wall of the trimming table; the grinding machine is arranged at the top of the trimming table; the rotating equipment is fixedly mounted at the top of the inner wall of the trimming table; the rotating frame is fixedly mounted at the output end of the rotating equipment, and the rotating frame penetrates through the top of the trimming table; the cover body is arranged at the top of the rotating frame; the correcting block is fixedly mounted at the top of the rotating frame, and the correcting block is used for positioning the cover body; through contact between the correcting block and the inner wall of the water inlet hole, the position of the cover body can be effectively limited, the stability and consistency of the cover body in the trimming process are ensured, the trimming precision is accordingly improved, and the correcting block is in contact with the inner wall of the water inlet hole and limits the cover body.

Description

Technical Field

[0001] The invention relates to the technical field of manhole cover trimming and grinding, in particular to a manhole cover repair and trimming device for municipal engineering. Background Art

[0002] The manhole cover repair and trimming device used in municipal engineering usually consists of a trimming table, a rotating device, a pressing frame and a grinding machine, and the manhole cover repair and trimming operation usually repairs and trims manhole covers of the same size.

[0003] The patent with the patent announcement number CN213319479U relates to a manhole cover repair and trimming device for municipal engineering, which relates to the field of municipal engineering, including a circular top plate, the top of the circular top plate is fixedly connected to the bottom of the motor fixing frame, the inner surface of the motor fixing frame is fixedly connected to the outer surface of the motor, the circular top plate is rotatably connected to one end of the supporting long rod through a fixed short column, the bottom side of the other end of the supporting long rod is fixedly connected to the top of the telescopic shock absorbing rod, and the bottom end of the telescopic shock absorbing rod is fixedly connected to the top of the circular anti-skid pad. This patent drives the output shaft to rotate through the motor, the motor output shaft drives the bevel gear 1 to rotate, the bevel gear 1 drives the bevel gear 2 to rotate, and the bevel gear 2 drives the high-speed rotation of the trimming grinding wheel through the transmission long rod, so as to achieve the effect of quickly trimming by turning the force sleeve rod around the track ring for one circle, which solves the problem that the traditional manhole cover repair and trimming requires manual trimming, which is time-consuming and labor-intensive, and the trimming is irregular, and the later maintenance is difficult.

[0004] In the above patent, the high-speed rotation of the trimming grinding wheel is driven by a long transmission rod, so that the effect of rapid trimming is achieved by quickly turning the force-bearing sleeve rod around the track ring. This solves the problem of traditional manhole cover maintenance and trimming, which requires manual trimming, is time-consuming and labor-intensive, and the trimming is irregular, making later maintenance difficult. However, it is difficult to ensure that the cover body fits tightly with the grinding machine during trimming. If the cover body and the grinding machine cannot fit tightly, the trimming accuracy will be affected, resulting in uneven trimming of the cover edge. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a manhole cover repair and trimming device for municipal engineering, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a manhole cover maintenance and trimming device for municipal engineering, comprising: a trimming table, the trimming table is arranged on the top of the ground; a trimming frame, the trimming frame is fixedly mounted on the front and rear walls of the trimming table; a grinding wheel machine, the grinding wheel machine is arranged on the top of the trimming table; a rotating device, the rotating device is fixedly mounted on the top of the inner wall of the trimming table; a rotating frame, the rotating frame is fixedly mounted on the output end of the rotating device, and the rotating frame passes through the top of the trimming table; a cover body, the cover body is arranged on the top of the rotating frame; a correction block, the correction block is fixedly mounted on the top of the rotating frame, and the correction block is used to position the cover body; a servo motor, the servo motor is fixedly mounted on the top of the trimming frame; a screw rod, the screw rod is fixedly mounted on the output end of the servo motor; a pressing rod, the pressing rod is slidably mounted on the inner wall of the trimming frame, the pressing rod is threadedly connected to the screw rod, and the pressing rod is used to fix the cover body; the pressing frame, the pressing frame rotates and passes through the top of the pressing rod, the correction block contacts the inner wall of the water inlet hole and limits the cover body.

[0007] According to the above technical solution, a connecting rod is fixedly installed on the inner wall of the trimming frame, a connecting plate is slidably installed on the circumferential surface of the connecting rod, a connecting groove is opened on the rear side of the connecting plate, and the pressing frame moves downward to contact the top of the cover body and fix the cover body for a second time.

[0008] According to the above technical solution, a No. 1 spring is arranged between the connecting rod and the connecting plate, and the No. 1 spring can drive the connecting plate to reset. The connecting plates are in contact with each other, and the pressing rod passes through the top of the trimming table. The pressing rod cannot continue to move downward so that an appropriate pressing force is maintained between the pressing frame and the cover body.

[0009] According to the above technical solution, a protective component for preventing the cover body from being directly taken out after trimming is provided at the top of the inner wall of the trimming table. A limiting component is provided at the top of the inner wall of the trimming table. The protective component includes a U-shaped rod, a T-shaped plate, a square hole, a support frame and a load-bearing plate. The U-shaped rod is fixedly installed on the top of the inner wall of the trimming table, the T-shaped plate is slidably installed on the circumferential surface of the U-shaped rod, the square hole is opened on the top of the trimming table, the support frame is slidably installed on the inner wall of the square hole, the load-bearing plate is fixedly installed on the inner wall of the square hole, and a No. 2 spring is provided between the support frame and the square hole. The support frame moves upward so that the support frame can fit with the side of the cover body when the cover body is rotated for trimming.

[0010] According to the above technical solution, a rotating rod is rotatably passed through the upper and lower walls of the load-bearing plate, a spiral groove is opened on the circumferential surface of the rotating rod, the support frame is slidably connected to the spiral groove, and a load-bearing spring is arranged between the U-shaped rod and the T-shaped plate, and the T-shaped plate can be driven to reset by the load-bearing spring.

[0011] According to the above technical solution, the front side of the T-shaped plate is set as an inclined surface, the bottom of the support frame is set as an inclined surface, the T-shaped plate contacts the bottom of the support frame, and the rotating rod can only rotate slowly so that the support frame can only move slowly downward.

[0012] According to the above technical solution, the limit assembly includes a butt joint tube, a piston rod and a limit plate, the butt joint tube is fixedly passed through the upper and lower walls of the load-bearing plate, the piston rod is slidably installed on the inner wall of the butt joint tube, the limit plate is slidably installed on the inner wall of the butt joint tube, a butt joint spring is arranged between the butt joint tube and the piston rod, the rear side of the limit plate is fixedly passed through the limit frame, the circumferential surface of the rotating frame is provided with a limit hole, mineral oil is arranged inside the butt joint tube, and the limit frame moves to the rear side to break away from the contact with the limit hole and release the limit on the rotating frame.

[0013] According to the above technical solution, an O-ring is arranged between the limit plate and the butt tube, and the sealing between the limit plate and the butt tube can be improved by the O-ring. The limit frame contacts the inner wall of the limit hole, and the bottom of the piston rod is set as an inclined surface.

[0014] The present invention provides a manhole cover repair and trimming device for municipal engineering, which has the following beneficial effects: (1) The municipal engineering manhole cover repair and trimming device, through the correction block contacting the inner wall of the water inlet hole and limiting the cover body, can effectively limit the position of the cover body through the contact between the correction block and the inner wall of the water inlet hole, ensuring the stability and consistency of the cover body during the trimming process, thereby improving the trimming accuracy, and the pressing frame moves downward to contact the top of the cover body and fix the cover body for the second time. Through the secondary fixation of the cover body, it can effectively prevent the cover body from rebounding due to uneven force during the trimming process, thereby avoiding uneven cutting or trimming during the trimming process.

[0015] (2) The manhole cover repair and trimming device for municipal engineering can maintain an appropriate pressing force between the pressing frame and the cover body by preventing the pressing rod from moving further downward. By limiting the movement of the pressing rod, it can ensure that the pressure applied to the cover body is just right, thereby improving the accuracy of repair and trimming. In addition, the appropriate pressing force can protect the rotating equipment and avoid excessive use or overloading of the rotating equipment.

[0016] (3) The manhole cover repair and trimming device for municipal engineering uses a support frame to move upward so that the support frame can fit with the side of the cover body when the cover body is rotated for trimming. The fit between the support frame and the side of the cover body can reduce the shaking of the cover body during the rotational trimming process. The fit between the support frame and the side of the cover body can effectively scrape off the waste residue generated by the trimming, thereby improving the quality of the final trimming.

[0017] (4) The municipal engineering manhole cover repair and trimming device can facilitate the removal of the cover by slowly moving the support frame downward to break away from the contact with the cover body. If the cover body is removed immediately after the trimming operation is completed, the trimming surface will be uneven or deformed. By slowly breaking away from the contact with the support frame, the cover body can naturally cool and restore its shape without the action of additional external force, thereby avoiding unnecessary deformation.

[0018] (5) The manhole cover repair and trimming device for municipal engineering uses a limit frame to move backward to break away from the contact with the limit hole and release the limit on the rotating frame. By ensuring that the cover body is stable before releasing the limit on the rotating frame, the safety risk of the cover body slipping can be greatly reduced, ensuring the smooth progress of the trimming operation and protecting the safety of the workers at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a half-section structure of the trimming table of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement of part A; Figure 4 It is a schematic diagram of the position structure of the rotating device and the rotating frame of the present invention; Figure 5 It is a schematic diagram of the position structure of the load-bearing plate and the rotating rod of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the structure of part B in the middle is enlarged; Figure 7 It is a schematic diagram of the half-section structure of the butt-jointed pipe of the present invention.

[0020] In the figure: 1. trimming table; 2. trimming frame; 3. grinding wheel machine; 4. rotating equipment; 5. rotating frame; 6. correction block; 7. cover; 8. servo motor; 9. screw; 10. pressing rod; 11. connecting rod; 12. connecting plate; 13. connecting groove; 14. pressing frame; 151. U-shaped rod; 152. T-shaped plate; 153. square hole; 154. supporting frame; 155. load-bearing plate; 156. rotating rod; 157. load-bearing spring; 161. butt tube; 162. piston rod; 163. butt spring; 164. limit plate; 165. limit frame; 166. limit hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 6 One embodiment of the present invention is: a manhole cover repair and trimming device for municipal engineering, comprising: a trimming table 1, the trimming table 1 is arranged on the top of the ground; a trimming frame 2, the trimming frame 2 is fixedly installed on the front and rear walls of the trimming table 1; a grinder 3, the grinder 3 is arranged on the top of the trimming table 1; a rotating device 4, the rotating device 4 is fixedly installed on the top of the inner wall of the trimming table 1; a rotating frame 5, the rotating frame 5 is fixedly installed at the output end of the rotating device 4, and the rotating frame 5 passes through the top of the trimming table 1; a cover body 7, the cover body 7 is arranged on the top of the rotating frame 5; a correction block 6, the correction block 6 is fixedly installed on the top of the rotating frame 5, and the correction block 6 is used to position the cover body 7; servo motor 8, servo motor 8 is fixedly installed on the top of the trimming frame 2; screw rod 9, screw rod 9 is fixedly installed on the output end of servo motor 8; pressing rod 10, pressing rod 10 is slidably installed on the inner wall of the trimming frame 2, pressing rod 10 is threadedly connected with screw rod 9, pressing rod 10 is used to fix the cover body 7; pressing frame 14, pressing frame 14 rotates and passes through the top of pressing rod 10, through the contact between correction block 6 and the inner wall of water inlet hole, the position of cover body 7 can be effectively limited, ensuring the stability and consistency of cover body 7 during trimming process, thereby improving the trimming accuracy, A connecting rod 11 is fixedly installed on the inner wall of the trimming frame 2, and a connecting plate 12 is slidably installed on the circumferential surface of the connecting rod 11. A connecting groove 13 is provided on the rear side of the connecting plate 12. The pressing frame 14 moves downward to contact the top of the cover body 7 and fix the cover body 7 for a second time. Through the secondary fixation of the cover body 7, the cover body 7 can be effectively prevented from rebounding due to uneven force during the trimming process, thereby avoiding uneven cutting or trimming during the trimming process.

[0023] A No. 1 spring is arranged between the connecting rod 11 and the connecting plate 12, and the No. 1 spring can drive the connecting plate 12 to reset, and the connecting plates 12 are in contact with each other. The pressing rod 10 passes through the top of the trimming table 1. By limiting the movement of the pressing rod 10, it can ensure that the pressure applied to the cover body 7 is just right, and the appropriate pressing force can protect the rotating device 4 to avoid excessive use or overload of the rotating device 4.

[0024] When this embodiment is working: after aligning the water inlet hole on the surface of the cover body 7 with the correction block 6, manually place the cover body 7 on the top of the rotating frame 5. After the cover body 7 is placed on the top of the rotating frame 5, the correction block 6 contacts the inner wall of the water inlet hole. The correction block 6 contacts the inner wall of the water inlet hole and limits the cover body 7. After the cover body 7 is limited by the correction block 6, the servo motor 8 operates to drive the screw rod 9 to rotate. The screw rod 9 rotates to squeeze the pressing rod 10. The pressing rod 10 is moved downward by the screw rod 9. The pressing rod 10 moves downward and drives the pressing frame 14 to move downward. The pressing frame 14 moves downward and contacts the top of the cover body 7 and fixes the cover body 7 for the second time. At the same time, the pressing rod 10 moves downward to align with the connecting groove 13. After the pressing rod 10 and the engaging groove 13 are aligned, the pressing rod 10 and the engaging groove 13 are aligned. After the connecting groove 13 is aligned, the connecting plate 12 moves toward the direction close to the cover body 7 under the elastic force of spring No. 1. The connecting plate 12 moves toward the direction close to the cover body 7 so that the connecting groove 13 contacts the pressing rod 10. The connecting groove 13 contacts the pressing rod 10 so that the connecting plate 12 limits the pressing rod 10. The pressing rod 10 is limited by the connecting plate 12 and cannot move downward. The pressing rod 10 cannot move downward so that the pressing frame 14 and the cover body 7 maintain an appropriate pressing force. After the pressing frame 14 and the cover body 7 maintain an appropriate pressing force, the rotating equipment 4 drives the rotating frame 5 to rotate, and the rotating frame 5 rotates to drive the cover body 7 to rotate, and at the same time, the grinding wheel machine 3 is started to trim the rotating cover body 7.

[0025] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, a protective component for preventing the cover body 7 from being directly taken out after trimming is provided at the top of the inner wall of the trimming table 1, and a limiting component is provided at the top of the inner wall of the trimming table 1, and the protective component includes a U-shaped rod 151, a T-shaped plate 152, a square hole 153, a support frame 154 and a load-bearing plate 155. The U-shaped rod 151 is fixedly installed on the top of the inner wall of the trimming table 1, the T-shaped plate 152 is slidably installed on the circumferential surface of the U-shaped rod 151, the square hole 153 is opened at the top of the trimming table 1, the support frame 154 is slidably installed on the inner wall of the square hole 153, and the load-bearing plate 155 is fixedly installed on the inner wall of the square hole 153. A No. 2 spring is provided between the support frame 154 and the square hole 153, and the shaking of the cover body 7 during the rotation trimming process can be reduced by the support frame 154 being fitted with the side of the cover body 7.

[0026] A rotating rod 156 is rotatably passed through the upper and lower walls of the load-bearing plate 155, and a spiral groove is provided on the circumferential surface of the rotating rod 156. The support frame 154 is slidably connected to the spiral groove. A load-bearing spring 157 is provided between the U-shaped rod 151 and the T-shaped plate 152. The load-bearing spring 157 can drive the T-shaped plate 152 to reset. The support frame 154 is fitted with the side of the cover body 7 to effectively scrape off the waste residue generated by the trimming, thereby improving the quality of the final trimming.

[0027] The front side of the T-shaped plate 152 is set as an inclined surface, and the bottom of the support frame 154 is set as an inclined surface. The T-shaped plate 152 contacts the bottom of the support frame 154, and the rotating rod 156 can only rotate slowly so that the support frame 154 can only move downward slowly. By slowly disengaging from the contact with the support frame 154, the cover body 7 can naturally cool and restore its shape without additional external force, thereby avoiding unnecessary deformation.

[0028] The limiting assembly includes a butt joint tube 161, a piston rod 162 and a limiting plate 164. The butt joint tube 161 is fixedly passed through the upper and lower walls of the load-bearing plate 155. The piston rod 162 is slidably installed on the inner wall of the butt joint tube 161. The limiting plate 164 is slidably installed on the inner wall of the butt joint tube 161. A butt joint spring 163 is arranged between the butt joint tube 161 and the piston rod 162. The rear side of the limiting plate 164 is fixedly passed through the limiting frame 165. The circumferential surface of the rotating frame 5 is provided with a limiting hole 166. Mineral oil is arranged inside the butt joint tube 161. By ensuring that the cover body 7 is stable before releasing the limit of the rotating frame 5, the safety risk of the cover body 7 slipping can be greatly reduced, thereby ensuring the smooth progress of the trimming operation.

[0029] An O-ring is provided between the limit plate 164 and the butt tube 161 , and the sealing between the limit plate 164 and the butt tube 161 can be improved by the O-ring. The limit frame 165 contacts the inner wall of the limit hole 166 , and the bottom of the piston rod 162 is set as an inclined surface.

[0030] When this embodiment is working: the pressing rod 10 moves downward and contacts the inclined surface of the T-shaped plate 152 and squeezes the T-shaped plate 152. The T-shaped plate 152 is squeezed by the pressing rod 10 and moves in the direction close to the rotating device 4. The T-shaped plate 152 moves in the direction close to the rotating device 4 to pull the load-bearing spring 157. The load-bearing spring 157 is pulled by the T-shaped plate 152 to deform and accumulate force. At the same time, the T-shaped plate 152 moves in the direction close to the rotating device 4 and contacts the inclined surface of the support frame 154 and squeezes the support frame 154. The support frame 154 is squeezed by the T-shaped plate 152 and moves upward. The support frame 154 moves upward to The spring is squeezed, and the No. 2 spring is squeezed by the support frame 154 to produce deformation and accumulate force. At the same time, the support frame 154 moves upward so that the support frame 154 can fit with the side of the cover body 7 when the cover body 7 is rotated for trimming. After the trimming operation of the cover body 7 is completed, the support frame 154 moves downward and resets under the elastic force of the No. 2 spring. The support frame 154 moves downward and resets to squeeze the rotating rod 156. The rotating rod 156 is squeezed by the support frame 154 and can only rotate slowly. The rotating rod 156 can only rotate slowly, so that the support frame 154 can only move downward slowly. The support frame 154 moves slowly downward to break away from the contact with the cover body 7, making it convenient to take out the cover body 7.

[0031] The support frame 154 moves upward and contacts the piston rod 162 and squeezes the piston rod 162. The piston rod 162 moves upward due to the squeezing of the support frame 154. The piston rod 162 moves upward to squeeze the docking spring 163. The docking spring 163 is squeezed by the piston rod 162 to generate shape and store force. At the same time, the piston rod 162 moves upward to squeeze the mineral oil inside the docking tube 161. The mineral oil inside the docking tube 161 is squeezed by the piston rod 162 and moves upward. The mineral oil moves upward and contacts the limit plate 164 and squeezes the limit plate 164. The limit plate 164 moves backward due to the squeezing of the mineral oil. The limit plate 164 moves backward to drive the limit frame 165 to move. The limit frame 165 moves backward to break away from the contact with the limit hole 166 and release the limit on the rotating frame 5. After the limit of the rotating frame 5 is released, the rotating device 4 can drive the rotating frame 5 to rotate.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manhole cover repair and trimming device for municipal engineering, characterized in that: include: A trimming table (1), wherein the trimming table (1) is arranged on top of the ground; A trimming frame (2), wherein the trimming frame (2) is fixedly mounted on the front and rear walls of the trimming table (1); A grinding machine (3), wherein the grinding machine (3) is arranged on the top of the trimming table (1); A rotating device (4), the rotating device (4) being fixedly mounted on the top of the inner wall of the trimming table (1); A rotating frame (5), the rotating frame (5) being fixedly mounted on the output end of the rotating device (4), the rotating frame (5) passing through the top of the trimming table (1); A cover body (7), wherein the cover body (7) is arranged on the top of the rotating frame (5); A correction block (6), the correction block (6) being fixedly mounted on the top of the rotating frame (5), and the correction block (6) being used to position the cover body (7); A servo motor (8), wherein the servo motor (8) is fixedly mounted on the top of the trimming frame (2); A screw rod (9), wherein the screw rod (9) is fixedly mounted on an output end of the servo motor (8); A pressing rod (10), the pressing rod (10) being slidably mounted on the inner wall of the trimming frame (2), the pressing rod (10) being threadedly connected to the screw rod (9), and the pressing rod (10) being used to fix the cover body (7); A pressing frame (14) is rotatably connected to the top of the pressing rod (10).

2. A manhole cover repair and trimming device for municipal engineering according to claim 1, characterized in that: A connecting rod (11) is fixedly mounted on the inner wall of the trimming frame (2), a connecting plate (12) is slidably mounted on the circumferential surface of the connecting rod (11), and a connecting groove (13) is provided on the rear side of the connecting plate (12).

3. A manhole cover repair and trimming device for municipal engineering according to claim 2, characterized in that: A spring is arranged between the connecting rod (11) and the connecting plate (12), the connecting plates (12) are in contact with each other, the pressing rod (10) passes through the top of the trimming table (1), a protective component for preventing the cover body (7) from being directly removed after trimming is arranged at the top of the inner wall of the trimming table (1), and a limit position component is arranged at the top of the inner wall of the trimming table (1).

4. A manhole cover repair and trimming device for municipal engineering according to claim 3, characterized in that: The protection assembly comprises a U-shaped rod (151), a T-shaped plate (152), a square hole (153), a support frame (154) and a load-bearing plate (155); the U-shaped rod (151) is fixedly mounted on the top of the inner wall of the trimming table (1); the T-shaped plate (152) is slidably mounted on the circumferential surface of the U-shaped rod (151); the square hole (153) is opened on the top of the trimming table (1); the support frame (154) is slidably mounted on the inner wall of the square hole (153); the load-bearing plate (155) is fixedly mounted on the inner wall of the square hole (153); and a No. 2 spring is arranged between the support frame (154) and the square hole (153).

5. A manhole cover repair and trimming device for municipal engineering according to claim 4, characterized in that: A rotating rod (156) is rotatably passed through the upper and lower walls of the load-bearing plate (155); a spiral groove is provided on the circumferential surface of the rotating rod (156); the support frame (154) is slidably connected to the spiral groove; and a load-bearing spring (157) is provided between the U-shaped rod (151) and the T-shaped plate (152).

6. A manhole cover repair and trimming device for municipal engineering according to claim 5, characterized in that: The front side of the T-shaped plate (152) is arranged as an inclined surface, the bottom of the support frame (154) is arranged as an inclined surface, and the T-shaped plate (152) is in contact with the bottom of the support frame (154).

7. A manhole cover repair and trimming device for municipal engineering according to claim 6, characterized in that: The limiting assembly comprises a butt joint tube (161), a piston rod (162) and a limiting plate (164); the butt joint tube (161) is fixedly passed through the upper and lower walls of the load-bearing plate (155); the piston rod (162) is slidably mounted on the inner wall of the butt joint tube (161); the limiting plate (164) is slidably mounted on the inner wall of the butt joint tube (161); a butt joint spring (163) is arranged between the butt joint tube (161) and the piston rod (162); the rear side of the limiting plate (164) is fixedly passed through the limiting frame (165); a limiting hole (166) is provided on the circumferential surface of the rotating frame (5); and mineral oil is arranged inside the butt joint tube (161).

8. A manhole cover repair and trimming device for municipal engineering according to claim 7, characterized in that: An O-ring is provided between the limiting plate (164) and the butt pipe (161); the limiting frame (165) contacts the inner wall of the limiting hole (166); and the bottom of the piston rod (162) is provided as an inclined surface.

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