Cutting device for underground pipeline repair

Abstract

The invention relates to the technical field of pipeline cutting, and discloses an underground pipeline repairing cutting device which comprises a bottom plate, and a driving assembly is fixed to the upper surface of the bottom plate and used for being connected with the whole device; the cutting assembly is fixed to the driving end of the driving assembly, and the driving assembly is used for driving and adjusting the position of the cutting assembly; the cutting assembly comprises a first motor, the outer wall of the first motor is connected with the driving assembly, a rotating disc is fixed to the driving end of the first motor, a first electric push rod is fixed to the interior of the rotating disc, a diamond cutting head is fixed to the bottom end of the first electric push rod, and two second electric push rods in bilateral symmetry are fixed to the interior of the rotating disc. A sawtooth cutter is fixed to the driving end of the second electric push rod. And through cooperation of the driving assembly and the cutting assembly, the cutting position is adjusted, meanwhile, the inner wall of the pipeline is conveniently cut through multiple cutters, and the cutting efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cutting, in particular to a cutting device for repairing underground pipelines. Background Art

[0002] With the continuous advancement of urbanization, underground pipeline systems have become an important part of urban infrastructure. Underground pipelines are used to transport water, natural gas, sewage, electricity, communications and other resources. These pipelines will be affected by erosion of the natural environment, material aging, external extrusion and sediments during long-term use, resulting in blockage, scaling, rupture and other problems on the inner wall of the pipeline. In order to ensure the normal operation of the pipeline, it is often necessary to maintain and repair the pipeline. During the maintenance process, the pipeline cutting device, as a key tool, can effectively remove obstacles inside the pipeline, repair damaged parts or cut abandoned pipelines. However, the existing pipeline cutting technology still has many problems in actual use, which limits its widespread application.

[0003] Common pipe cutting devices usually use a single type of cutting tool and rely on manual adjustment of the cutting position and depth. When facing pipes of different materials, these devices need to frequently replace the tool, resulting in low cutting efficiency. In addition, due to the narrow internal space of the pipe, the cutting device is difficult to work stably in complex pipe environments (such as bends, areas with changes in diameter or sediments). Especially in the curves of the pipe, the existing cutting devices often cause cutting deviations due to unstable position or uneven force, which seriously affects the effect of the repair work.

[0004] Therefore, in the application of existing pipe cutting devices, the tool adaptability is poor and cannot effectively meet the cutting needs of pipes of different materials; the equipment lacks precise cutting position adjustment and support functions, resulting in poor stability and large errors during the cutting process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a cutting device for repairing underground pipelines, which solves the problem that common pipeline cutting devices usually use a single type of cutting tool and rely on manual adjustment of the cutting position and depth.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cutting device for repairing underground pipelines, comprising a base plate, a driving assembly fixed on the upper surface of which is used to connect the entire device; a driving assembly, a cutting assembly fixed on its driving end, used to drive and adjust the position of the cutting assembly; the cutting assembly comprises a motor 1, the outer wall of the motor 1 is connected to the driving assembly, a rotating disk is fixed on the driving end of the motor 1, an electric push rod 1 is fixed inside the rotating disk, a diamond cutting head is fixed on the bottom end of the electric push rod 1, two electric push rods 2 that are symmetrical on both sides are fixed inside the rotating disk, a sawtooth cutting knife is fixed on the driving end of the electric push rod 2, a tungsten steel blade knife is fixed on the driving end of the electric push rod 2 that is away from each other, a spring 1 is sleeved on the outer wall of the electric push rod 1, and the other end of the spring 1 is fixed on the diamond cutting head; a supporting assembly fixed on the base plate, used to support the device when cutting the pipeline; a moving assembly fixed on the outer wall of the base plate, used to drive the entire device; a control module connected to the driving assembly, used to control the movement of the driving assembly.

[0007] Preferably, the driving assembly includes a mounting plate, a base is fixed to the upper surface of the mounting plate, a manipulator is rotatably mounted on the upper surface of the base, a connector is fixed to the driving end of the manipulator, and an inner wall of the connector is fixedly connected to a motor.

[0008] Preferably, a sensor is fixed on the outer wall of the mounting plate, a controller is fixed on the upper surface of the manipulator, the sensor and the controller are electrically connected, and a camera is fixed on the outer wall of the manipulator, and the camera and the sensor are electrically connected.

[0009] Preferably, the control module includes a detection unit, a conveying unit and a control unit. The detection unit is a camera used to monitor the condition of the inner wall of the pipeline in real time and provide visual information to determine the cutting position and progress; the conveying unit is a sensor used to transmit real-time detection data and feedback changes in the environment inside the pipeline and the state of the cutting device; the control unit is a controller used to receive detection data and adjust the working state of the cutting device, including precise control of cutting speed, angle and propulsion direction.

[0010] Preferably, the supporting assembly includes a slide rail, the upper surface of the slide rail is fixed on the base plate, an electric slider is fixed on the upper surface of the slide rail, a bracket is fixed on the upper surface of the electric slider, a connecting block is fixed to the outer wall of the bracket, motor 2 is fixed to the outer wall of the connecting block, a worm is fixed to the driving end of motor 2, a transmission rod is rotated inside the bracket, a worm wheel is fixed to one end of the transmission rod, the worm wheel and the worm are meshed, a gear is fixed to the other end of the transmission rod, a symmetrical rack is slid inside the bracket, the rack is meshed with the gear, a movable rod is fixed to the outer wall of the rack, and the outer wall of the movable rod slides inside the bracket.

[0011] Preferably, a hinge block 1 is rotatably provided at the top of the movable rod, a rubber plate is fixed to the top of the hinge block 1, one end of a spring 2 is fixed to the bottom end of the rubber plate, and the other end of the spring 2 is fixed to the outer wall of the movable rod.

[0012] Preferably, an articulated block 2 is fixed to the outer wall of the movable rod, a telescopic rod is rotatably arranged inside the articulated block 2, an articulated block 3 is rotatably arranged at the bottom end of the telescopic rod, and the bottom end of the articulated block 3 is fixed to the lower surface of the rubber plate.

[0013] Preferably, the moving component includes a fixed plate, an internal fixed block of the fixed plate, a motor three is fixed to the outer wall of the fixed block, a transmission wheel one is fixed to the output end of the motor three, a belt is driven on the inner wall of the transmission wheel one, a transmission wheel two is driven on the outer wall of the belt, rotating rods are fixed inside the transmission wheels one and two, and a spiral propulsion rod is fixed on the outer wall of the rotating rod.

[0014] Preferably, a hydraulic rod is fixed inside the fixed plate, a movable plate is fixed to the driving end of the hydraulic rod, and a rubber wheel is fixed to the outer wall of the movable plate.

[0015] Working principle: When the device needs to be used, the driving component is fixed to the base plate through the mounting plate and the base. The manipulator drives the connector to connect and transmit the motor 1. When the motor 1 is started, it drives the rotating disk to rotate. The electric push rod 1 inside the rotating disk will extend and retract under the action of the motor to push the diamond cutting head for cutting. The spring 1 is installed on the outer wall of the electric push rod 1 to buffer the vibration and stress generated during the cutting process, while maintaining the stability of the diamond cutting head and the cutting depth adjustment. The rotating disk is also connected to two symmetrical electric push rods 2. The driving ends of the electric push rods 2 are respectively fixed with serrated cutting knives and tungsten steel cutting knives. These tools can perform precise cutting according to the different requirements of the pipeline material. Through the telescopic adjustment of the electric push rod, it can adapt to the cutting operations at different positions inside the pipeline. The support component is fixed to the base plate through the slide rail, and is longitudinally moved and adjusted by the electric slider. The bracket supports the entire device and maintains its stability. The second motor drives the worm to rotate, and the worm wheel meshes with the worm to drive the transmission rod to rotate. The gear at one end of the transmission rod meshes with the symmetrical rack to drive the movable rod to move up and down. The top of the movable rod is connected to the rubber plate through the hinge block one, and the rubber plate is connected to the movable rod through the spring two, which is used to stabilize the device and buffer vibration during the cutting process. The rubber plate can also cooperate with the telescopic rod through the hinge block two, and more flexible support adjustment can be performed through the hinge block three. The moving component is installed on the bottom plate through the fixed plate, and the fixed block fixes the motor three. When the motor three is started, the transmission wheel one drives the transmission wheel two to rotate synchronously through the belt. The rotation of the transmission wheel drives the spiral propulsion rod to rotate through the rotating rod. The spiral propulsion rod realizes the forward and backward movement of the device through the friction with the inner wall of the pipeline. The moving plate moves under the drive of the hydraulic rod. The rubber wheel is installed on the moving plate, which can reduce friction during the spiral propulsion process. At the same time, it has a certain elasticity and can shrink when the pipeline is bent to avoid jamming.

[0016] The present invention provides a cutting device for repairing underground pipelines, which has the following beneficial effects:

[0017] 1. The present invention achieves the adjustment of the cutting position through the cooperation between the driving component and the cutting component, and facilitates the use of a variety of cutters to cut the inner wall of the pipe, greatly improving the cutting efficiency, and solving the problems of the existing cutting device being unable to quickly replace the cutter when facing a variety of pipe materials, and the inflexible cutting position and the inability to accurately control the cutting depth.

[0018] 2. The present invention achieves the effect of facilitating the control of the robot arm while supporting the inside of the pipe through the coordination between the control module and the support assembly, so that the entire device remains stable during cutting, and solves the problem in the prior art that the cutting device cannot be effectively supported during operation, resulting in reduced cutting accuracy and easy deviation of the equipment.

[0019] 3. The present invention reduces friction through the interaction between the moving component and the rubber wheel. At the same time, the rubber wheel elastically contracts when the spiral rod moves forward to avoid blocking the advancement due to pipe bending. The rubber wheel plays the role of assisting the moving component, solving the problem of low advancement efficiency caused by sticking and excessive friction when the existing device is advanced in pipe bending, diameter change or narrow area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the robot part of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the rotating disk part of the present invention;

[0023] Figure 4 It is a schematic diagram of the partial structure of the rubber sheet of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the support part of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the rack part of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the fixing plate part of the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the spiral propulsion rod of the present invention;

[0028] Fig. 9 It is a partial structural schematic diagram of the hydraulic rod of the present invention.

[0029] Among them, 1. bottom plate; 2. drive assembly; 201. mounting plate; 202. base; 203. manipulator; 204. connector; 3. cutting assembly; 301. motor 1; 302. rotating disk; 303. electric push rod 1; 304. spring 1; 305. diamond cutting head; 306. electric push rod 2; 307. sawtooth cutting knife; 308. tungsten steel cutting knife; 4. support assembly; 401. slide rail; 402. electric slider; 403. bracket; 404. connector; 405. motor 2; 406. worm; 407. worm wheel; 408. 8. Transmission rod; 409. Gear; 410. Rack; 411. Movable rod; 412. Articulated block 1; 413. Rubber plate; 414. Spring 2; 415. Articulated block 2; 416. Telescopic rod; 417. Articulated block 2; 5. Moving assembly; 501. Fixed plate; 502. Fixed block; 503. Motor 3; 504. Transmission wheel 1; 505. Belt; 506. Transmission wheel 2; 507. Rotating rod; 508. Screw propulsion rod; 6. Hydraulic rod; 7. Moving plate; 8. Rubber wheel; 9. Sensor; 10. Controller; 11. Camera. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the specification 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.

[0031] Example:

[0032] Please see attached Figure 1 - Attachment Figure 3The embodiment of the present invention provides a cutting device for repairing underground pipelines, comprising a bottom plate 1, a driving assembly 2 is fixed on the upper surface of the bottom plate 1 for connecting the entire device; the driving assembly 2, a cutting assembly 3 is fixed on the driving end of the driving assembly 2 for driving and adjusting the position of the cutting assembly 3; the cutting assembly 3 comprises a motor 301, the outer wall of the motor 301 is connected to the driving assembly 2, a rotating disk 302 is fixed on the driving end of the motor 301, an electric push rod 303 is fixed inside the rotating disk 302, a diamond cutting head 305 is fixed on the bottom end of the electric push rod 303, two electric push rods 306 symmetrically fixed on the inside of the rotating disk 302, a sawtooth cutter 307 is fixed on the driving end of the electric push rod 306, and the electric push rods 306 are separated from each other. A tungsten steel blade knife 308 is fixed to the driving end of 06, a spring 304 is sleeved on the outer wall of the electric push rod 303, and the other end of the spring 304 is fixed to the diamond cutting head 305; a support component 4 is fixed on the base plate 1, and is used to support the device when cutting the pipe; a moving component 5 is fixed on the outer wall of the base plate 1, and is used to drive the entire device; a control module is connected to the driving component 2, and is used to control the movement of the driving component 2. The driving component 2 includes a mounting plate 201, a base 202 is fixed to the upper surface of the mounting plate 201, and a manipulator 203 is rotatably arranged on the upper surface of the base 202, and a connector 204 is fixed to the driving end of the manipulator 203, and the inner wall of the connector 204 is fixedly connected to the motor 301.

[0033] Specifically, the cutting assembly 3 is driven by a motor 301, which is connected to a rotating disk 302. An electric push rod 303 is arranged inside the rotating disk 302, and a diamond cutting head 305 is connected to the bottom end for cutting hard pipes. A spring 304 is sleeved on the outer wall of the electric push rod 303 to provide cutting stability. The rotating disk 302 is also equipped with a left-right symmetrical electric push rod 306, which is respectively equipped with a serrated cutting knife 307 and a tungsten steel blade knife 308 for cutting different materials. The support assembly 4 provides stable support, the moving assembly 5 drives the device to move, and the control module accurately adjusts the cutting position and the advancement speed to ensure efficient and accurate cutting. This design improves the flexibility and efficiency of multi-tool cutting, and solves the problems of inflexible cutting and inconvenient tool switching of the existing device.

[0034] Please see attached Figure 4 - Attachment Figure 6A sensor 9 is fixed on the outer wall of the mounting plate 201, a controller 10 is fixed on the upper surface of the manipulator 203, the sensor 9 and the controller 10 are electrically connected, a camera 11 is fixed on the outer wall of the manipulator 203, the camera 11 and the sensor 9 are electrically connected, the control module includes a detection unit, a conveying unit and a control unit, the detection unit is the camera 11 used to monitor the condition of the inner wall of the pipeline in real time, and provide visual information to judge the cutting position and progress; the conveying unit is the sensor 9 used to transmit real-time detection data, feedback the changes in the environment in the pipeline and the state of the cutting device; the control unit is the controller 10 used to receive the detection data and adjust the working state of the cutting device, including precise control of the cutting speed, angle and propulsion direction, the support assembly 4 includes a slide rail 401, the upper surface of the slide rail 401 is fixed on the bottom plate 1, the upper surface of the slide rail 401 is fixed with an electric slider 402, the upper surface of the electric slider 402 is fixed with a bracket 403, the outer wall of the bracket 403 is fixed with a connecting block 404, the outer wall of the connecting block 404 is fixed Motor 2 405, a worm 406 is fixed to the driving end of motor 2 405, a transmission rod 408 is rotated inside the bracket 403, a worm wheel 407 is fixed to one end of the transmission rod 408, the worm wheel 407 and the worm 406 are meshed, a gear 409 is fixed to the other end of the transmission rod 408, a symmetrical rack 410 is slidably provided inside the bracket 403, the rack 410 and the gear 409 are meshed, a movable rod 411 is fixed to the outer wall of the rack 410, and the outer wall of the movable rod 411 slides inside the bracket 403 The top of the movable rod 411 is rotated with a hinge block 412, the top of the hinge block 412 is fixed with a rubber plate 413, the bottom end of the rubber plate 413 is fixed with one end of a spring 414, the other end of the spring 414 is fixed to the outer wall of the movable rod 411, the outer wall of the movable rod 411 is fixed with a hinge block 415, the inside of the hinge block 415 is rotated with a telescopic rod 416, the bottom end of the telescopic rod 416 is rotated with a hinge block 417, and the bottom end of the hinge block 417 is fixed to the lower surface of the rubber plate 413.

[0035] Specifically, a controller 10 is fixed on the upper surface of the manipulator 203, and the sensor 9 is electrically connected to the controller 10. A camera 11 is fixed on the outer wall of the manipulator 203, and the camera 11 is electrically connected to the sensor 9. This structure realizes the feedback and processing of real-time data, and provides visual information of the inner wall of the pipeline. Through the cooperation of the detection unit, the conveying unit and the control unit, the camera 11 in the detection unit is used to monitor the condition of the inner wall of the pipeline in real time, judge the cutting position and progress, and ensure accurate cutting; the conveying unit is the sensor 9 used to transmit the detected environment and device status data to the controller 10, and feedback the changes in the pipeline; the control unit is the controller 10, which can accurately adjust the working state of the cutting device after receiving the detection data, including the cutting speed, angle and propulsion direction, to ensure the efficient operation of the device in a complex environment. The design of the support assembly 4 includes a slide rail 401, which is fixed on the base plate 1. The electric slider 402 is installed above the slide rail 401 and can move along the slide rail 401. The bracket 403 is fixed above the electric slider 402. The outer wall connecting block 404 of the bracket 403 fixes the motor 2 405. The driving end of the motor 2 405 is engaged with the worm gear 407 through the worm 406 to drive the transmission rod 408 to rotate. One end of the transmission rod 408 is engaged with the worm gear 407, and the other end drives the symmetrical rack 410 inside the bracket 403 to slide through the gear 409. The outer wall of the rack 410 is fixed with a movable rod 411, which can slide inside the bracket 403 to ensure flexible adjustment of the support device. The top of the movable rod 411 is connected to the rubber plate 413 through the hinge block 1 412, and the rubber plate 413 is connected to the movable rod 411 through the spring 2 414. The spring provides buffering and elastic support to ensure the stability and adaptability of the support. The hinge block 2 415 is connected to the hinge block 3 417 through the telescopic rod 416 to achieve more flexible angle adjustment. The rubber plate 413 is fixed on the surface below it, which further improves the adaptability and stability of the support device in complex environments and effectively avoids the problem of unstable support caused by irregular pipelines.

[0036] Please see attached Figure 7 - Attachment Fig. 9 The moving component 5 includes a fixed plate 501, a fixed block 502 inside the fixed plate 501, a motor 3 503 is fixed to the outer wall of the fixed block 502, a transmission wheel 1 504 is fixed to the output end of the motor 3 503, a belt 505 is driven on the inner wall of the transmission wheel 1 504, a transmission wheel 2 506 is driven on the outer wall of the belt 505, a rotating rod 507 is fixed inside the transmission wheel 1 504 and the transmission wheel 2 506, a spiral propulsion rod 508 is fixed on the outer wall of the rotating rod 507, a hydraulic rod 6 is fixed inside the fixed plate 501, a moving plate 7 is fixed to the driving end of the hydraulic rod 6, and a rubber wheel 8 is fixed to the outer wall of the moving plate 7.

[0037] Specifically, the motor 3 503 drives the transmission wheel 1 504 to rotate, and the inner wall of the transmission wheel 1 504 is connected to the transmission wheel 2 506 through the belt 505. The use of the belt 505 can effectively reduce the vibration and wear of the direct mechanical transmission, and at the same time ensure the stability of the power transmission. The inside of the transmission wheel 1 504 and the transmission wheel 2 506 are both fixed with a rotating rod 507, and the outer wall of the rotating rod 507 is installed with a spiral propulsion rod 508. When the spiral propulsion rod 508 rotates, it pushes the device forward or backward through the friction force with the inner wall of the pipeline, ensuring that the device can move smoothly inside the pipeline and adapt to the diameter and surface conditions of different pipelines. In order to further improve the flexibility and adaptability of the device, a hydraulic rod 6 is also fixed inside the fixed plate 501, and the driving end of the hydraulic rod 6 is connected to the mobile plate 7, and the outer wall of the mobile plate 7 is fixed with a rubber wheel 8. The rubber wheel 8 can effectively reduce the friction when the device moves, and at the same time has a certain elasticity, and can also be smoothly advanced in the curved or narrow area of ​​the pipeline without being easily stuck. The design of the mobile component 5 combines the advantages of hydraulic and mechanical transmission, which not only improves the moving efficiency of the device, but also ensures smooth operation in a complex pipeline environment, solving the problem in the prior art that the mobile device is prone to getting stuck or has excessive friction, resulting in low efficiency.

[0038] 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 cutting device for repairing underground pipelines, characterized in that: include: A bottom plate (1) having a driving assembly (2) fixed on its upper surface for connecting the entire device; The driving assembly (2) has a cutting assembly (3) fixed to its driving end, and is used to drive and adjust the position of the cutting assembly (3); the cutting assembly (3) comprises a motor (301), the outer wall of the motor (301) is connected to the driving assembly (2), a rotating disk (302) is fixed to the driving end of the motor (301), an electric push rod (303) is fixed inside the rotating disk (302), a diamond cutting head (305) is fixed at the bottom end of the electric push rod (303), and two electric push rods (305) are fixed inside the rotating disk (302) in a left-right symmetrical manner. (306), a sawtooth cutter (307) is fixed to the driving end of the second electric push rod (306), a tungsten steel blade (308) is fixed to the driving end of the second electric push rod (306) which is away from the driving end, and a spring (304) is sleeved on the outer wall of the first electric push rod (303), and the other end of the spring (304) is fixed on the diamond cutting head (305); a support component (4) is fixed on the bottom plate (1) and is used to support the device when cutting the pipe; a moving component (5) is fixed on the outer wall of the bottom plate (1) and is used to drive the entire device; The control module is connected to the driving component (2) and is used to control the movement of the driving component (2).

2. The cutting device for repairing underground pipelines according to claim 1, characterized in that: The driving assembly (2) comprises a mounting plate (201), a base (202) being fixed on the upper surface of the mounting plate (201), a manipulator (203) being rotatable on the upper surface of the base (202), a connector (204) being fixed on the driving end of the manipulator (203), and an inner wall of the connector (204) being fixedly connected to a motor 1 (301).

3. The cutting device for repairing underground pipelines according to claim 2, characterized in that: A sensor (9) is fixed on the outer wall of the mounting plate (201), a controller (10) is fixed on the upper surface of the manipulator (203), the sensor (9) and the controller (10) are electrically connected, and a camera (11) is fixed on the outer wall of the manipulator (203), the camera (11) and the sensor (9) are electrically connected.

4. The cutting device for repairing underground pipelines according to claim 1, characterized in that: The control module comprises a detection unit, a conveying unit and a control unit. The detection unit is a camera (11) for real-time monitoring of the condition of the inner wall of the pipeline and providing visual information to determine the cutting position and progress; the conveying unit is a sensor (9) for transmitting real-time detection data and feeding back changes in the environment in the pipeline and the state of the cutting device; the control unit is a controller (10) for receiving detection data and adjusting the working state of the cutting device, including precise control of the cutting speed, angle and propulsion direction.

5. The cutting device for repairing underground pipelines according to claim 1, characterized in that: The support assembly (4) comprises a slide rail (401), the upper surface of the slide rail (401) is fixed on the bottom plate (1), an electric slider (402) is fixed on the upper surface of the slide rail (401), a bracket (403) is fixed on the upper surface of the electric slider (402), a connecting block (404) is fixed on the outer wall of the bracket (403), a motor 2 (405) is fixed on the outer wall of the connecting block (404), a worm (406) is fixed on the driving end of the motor 2 (405), and an inner rotating shaft of the bracket (403) is fixed to the inner rotating shaft of the bracket (403). A transmission rod (408) is provided, one end of which is fixed with a worm wheel (407), the worm wheel (407) and the worm (406) are meshed with each other, a gear (409) is fixed with the other end of the transmission rod (408), a symmetrical rack (410) is slidably provided inside the bracket (403), the rack (410) and the gear (409) are meshed with each other, a movable rod (411) is fixed to the outer wall of the rack (410), and the outer wall of the movable rod (411) slides inside the bracket (403).

6. The cutting device for repairing underground pipelines according to claim 5, characterized in that: A hinge block 1 (412) is rotatably mounted at the top of the movable rod (411), a rubber plate (413) is fixed to the top of the hinge block 1 (412), one end of a spring 2 (414) is fixed to the bottom of the rubber plate (413), and the other end of the spring 2 (414) is fixed to the outer wall of the movable rod (411).

7. The cutting device for repairing underground pipelines according to claim 5, characterized in that: A hinge block 2 (415) is fixed on the outer wall of the movable rod (411), a telescopic rod (416) is rotatably mounted inside the hinge block 2 (415), a hinge block 3 (417) is rotatably mounted at the bottom end of the telescopic rod (416), and the bottom end of the hinge block 3 (417) is fixed to the lower surface of the rubber plate (413).

8. The cutting device for repairing underground pipelines according to claim 1, characterized in that: The moving assembly (5) comprises a fixed plate (501), an internal fixed block (502) of the fixed plate (501), a motor three (503) being fixed on the outer wall of the fixed block (502), a transmission wheel one (504) being fixed on the output end of the motor three (503), a belt (505) being driven on the inner wall of the transmission wheel one (504), a transmission wheel two (506) being driven on the outer wall of the belt (505), a rotating rod (507) being fixed inside the transmission wheel one (504) and the transmission wheel two (506), and a spiral propulsion rod (508) being fixed on the outer wall of the rotating rod (507).

9. The cutting device for repairing underground pipelines according to claim 8, characterized in that: A hydraulic rod (6) is fixed inside the fixed plate (501), a movable plate (7) is fixed to the driving end of the hydraulic rod (6), and a rubber wheel (8) is fixed to the outer wall of the movable plate (7).

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