Non-excavation repairing method for lining composite pipe of old coal mine gas pipeline

Abstract

The invention discloses a non-excavation repair method for a lining composite pipe of an old coal mine gas pipeline, which comprises the following steps of: blocking a repair end pipeline, detecting and discharging residual gas in the repair end pipeline, then putting inspection equipment into the pipeline, and confirming and processing a repair position. The inspection equipment comprises a connecting frame, a driving wheel, a recycling mechanism, a connecting body, a rotating mechanism, a camera module, an optimizing mechanism and a connecting rope, the connecting frame can be driven by the driving wheel to move in the pipeline, camera shooting is conducted through the camera module at the front end of the connecting frame, and images are sent to an external terminal, so that workers can know specific conditions in the pipeline conveniently, and the working efficiency is improved. And the rotating mechanism is arranged at the outer end of the camera module, the polishing mechanism is arranged at the outer end of the rotating mechanism, foreign matter in the pipeline can be treated through the polishing mechanism, subsequent repair operation in the pipeline is facilitated, observation and treatment are integrated, the repair efficiency of the pipeline is effectively improved, and high practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline repair, and in particular to a trenchless repair method for an inner-lined composite pipe of an old coal mine gas pipeline. Background Art

[0002] Trenchless construction refers to the use of various rock and soil drilling equipment and technical means to lay, replace and repair various underground pipelines in a very small part of the surface through guiding and directional drilling. The new construction technology will not hinder traffic, damage green space and vegetation, and will not affect the normal life and work order of shops, hospitals, schools and residents. It solves the interference of traditional excavation construction on residents' lives, damage and adverse effects on traffic, environment and the foundations of surrounding buildings, and has a high social and economic effect.

[0003] During the trenchless repair process, it is necessary to put inspection equipment into the pipeline before repair in order to understand the internal situation of the pipeline. The existing detection equipment has relatively simple functions. After the inspection, the staff needs to replace the equipment and process the inside of the pipeline, which is cumbersome and inconvenient and has certain limitations. Summary of the invention

[0004] The object of the present invention is to provide a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline, the specific steps are as follows: S1. Block the pipeline: Seal the gas pipeline to be repaired; S2. Detection of emissions: Detect the residual gas in the pipeline and collect and discharge it; S3. Observation and processing: Place the inspection equipment into the pipeline, confirm the repair position of the pipeline, and clean and maintain the inside of the pipeline; S4. Pipeline repair: Pull the repair hose to the repair position in the pipeline, make it fit the inner wall of the pipeline, and cover the repair position in the pipeline; S5 subsequent reinforcement: After the covering is completed, the repair location is observed through inspection equipment and the repair location is reinforced.

[0006] Preferably, the inspection equipment includes a connecting frame, a driving wheel, a recovery mechanism, a connecting body, a rotating mechanism, a camera module, an optimization mechanism and a connecting rope, wherein the four outer ends of the connecting frame are provided with rotatable driving wheels, the bottom middle end is provided with a recovery mechanism, the top end is connected with a connecting body, the front middle end of the connecting body is provided with a camera module, the front end of the connecting body is provided with a rotating mechanism at a position corresponding to the outer end of the camera module, the rear end of the connecting body is connected with the optimization mechanism, and the rear end of the optimization mechanism is connected with a connecting rope.

[0007] Preferably, it is characterized in that: the recovery mechanism includes a bottom basket, a collecting bag, a dust suction module, a collecting pipe and a suction nozzle, a group of bottom baskets are provided at the bottom middle end of the connecting frame, a group of collecting bags are provided on the inner side of the bottom basket, a group of dust suction modules are connected to the front end opening of the collecting bag, a group of collecting pipes are connected to the front end of the dust suction module, and a suction nozzle is provided at the bottom end of the collecting pipe.

[0008] Preferably, a group of movable grooves 1 corresponding to the connecting body is provided at the middle end of the top of the connecting frame, a group of movable grooves 2 is provided at the middle end of the bottom of the movable groove 1, a group of screw rods 1 are connected in the movable groove 2, a group of moving blocks 1 are provided at the front and rear ends of the screw rods 1, and a group of motors 1 are connected to the front end of the screw rods 1, and the top ends of the two groups of moving blocks 1 are connected to the middle end of the bottom of the connecting body through a group of connecting arms 1.

[0009] Preferably, the rotating mechanism includes a rotating cylinder, an annular groove, a second motor, gears and a grinding mechanism. A group of rotating cylinders is provided at the front end of the connecting body corresponding to the outer end of the camera module. A ring groove is provided on the side of the rotating cylinder close to the connecting body. A group of motors is connected to the left top end of the connecting body. The driving shaft of the second motor extends through the annular groove and is connected to a group of gears. A group of grinding mechanisms is provided at the outer end of the rotating cylinder.

[0010] Preferably, the grinding mechanism includes cavity one, screw two, motor two, moving block two, connecting arm two, connecting seat, motor three, grinding disc and connecting arm three, the outer end of the rotating cylinder is provided with a group of cavity one, a group of screw two is connected in the cavity one, a group of motor two is connected to the rear end of the screw two, a group of moving block two is provided at the outer end of the screw two, and a group of connecting arm two is provided at the outer side of the rotating cylinder near the rear end of cavity one, a group of connecting seat is connected to the other end of the connecting arm two, a group of motor three is provided at the middle end of the connecting seat, a driving shaft of motor three extends through and extends to the outside of the connecting seat and is connected to a group of grinding discs, a group of connecting arm three is provided at the middle end of one side of the connecting seat close to the rotating cylinder, and the other end of the connecting arm three is connected to the moving block two.

[0011] Preferably, the optimization mechanism comprises a fixed seat and a movable seat, the rear middle end of the connection body is connected to the fixed seat, the outer middle end of the fixed seat is provided with a group of rotating rings, the inner middle end is provided with a group of motors four, and the rear end of the fixed seat is connected to the movable seat; A group of cavities 2 are provided in the movable seat, a group of screws 3 are provided at the middle end of the cavities 2, a group of moving blocks 3 are connected to the outside of the screws 3, a group of connecting arms 4 are provided at the upper and lower ends of the moving blocks 3, the other ends of the two groups of connecting arms 4 extend through and extend to the outside of the movable seat and are connected to a group of connecting plates, a group of friction plates are provided on the other side of the connecting plates, the front end of the connecting plate close to the movable seat is connected to the rotating ring through a connecting arm 5, a group of motors 5 are provided at the rear end of the movable seat, and the driving shaft of the motor 5 is connected to the rear end of the screw 3.

[0012] Preferably, the outer side of the friction plate is arc-shaped and is connected to the connecting plate via a slot.

[0013] Preferably, an inner gear ring corresponding to the gear is provided on the inner side of the annular groove.

[0014] Preferably, the threads at both ends of the screw are opposite, and corresponding internal threaded holes are provided in the movable blocks at the left and right ends.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The repair method includes blocking the pipeline at the repair end, detecting and discharging the residual gas inside the pipeline, and then placing the inspection equipment into the pipeline to confirm and process the repair position. The inspection equipment includes a connecting frame, a driving wheel, a recovery mechanism, a connecting body, a rotating mechanism, a camera module, an optimization mechanism and a connecting rope. The connecting frame can move in the pipeline driven by the driving wheel, and take pictures through the camera module at its front end and send them to an external terminal, which is beneficial for the staff to understand the specific situation inside the pipeline. A rotating mechanism is provided at the outer end of the camera module, and a grinding mechanism is provided at the outer end of the rotating mechanism. Foreign matter in the pipeline can be processed through the grinding mechanism, which is beneficial for subsequent repair operations in the pipeline, realizes the integration of observation and processing, effectively improves the repair efficiency of the pipeline, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the trenchless repair method of the present invention; Figure 2 It is a right view structural schematic diagram of the detection device of the present invention; Figure 3 This is a schematic diagram of the structure of the recovery mechanism of the present invention; Figure 4 This is a schematic diagram of the internal structure of the movable tank of the present invention; Figure 5 It is a schematic diagram of the structure of the rotating mechanism of the present invention; Figure 6 It is a schematic diagram of the partial structure inside the ring groove of the present invention; Figure 7 This is a schematic diagram of the grinding mechanism structure of the present invention; Figure 8 This is a schematic diagram of the optimization mechanism structure of the present invention; Fig. 9 It is a schematic diagram of the connection structure of the connection plate of the present invention.

[0017] In the figure: connecting frame-1, driving wheel-2, recovery mechanism-3, connecting body-4, rotating mechanism-5, camera module-6, optimization mechanism-7, connecting rope-8, bottom basket-31, collection bag-32, dust suction module-33, collection pipe-34, suction nozzle-35, movable groove 1-41, movable groove 2-42, screw rod 1-43, moving block 1-44, motor 1-45, connecting arm 1-46, rotating cylinder-51, ring groove-52, motor 2-53, gear-54, grinding mechanism-55, Cavity one -551, screw two -552, motor two -553, moving block two -554, connecting arm two -555, connecting seat -556, motor three -557, grinding disc -558, connecting arm three -559, fixed seat -71, movable seat -72, rotating ring -711, motor four -712, cavity two -721, screw three -722, moving block three -723, connecting arm four -724, connecting plate -725, friction plate -726, connecting arm five -727, motor five -728. DETAILED DESCRIPTION

[0018] In order to further explain the technical solution of the present invention, it is described in detail below through specific embodiments.

[0019] See also Figure 1 The present invention provides a trenchless repair method for an old coal mine gas pipeline lined with a composite pipe, and the specific steps are as follows: S1. Block the pipeline: Seal the gas pipeline to be repaired; S2. Detection of emissions: Detect the residual gas in the pipeline and collect and discharge it; S3. Observation and processing: Place the inspection equipment into the pipeline, confirm the repair position of the pipeline, and clean and maintain the inside of the pipeline; S4. Pipeline repair: Pull the repair hose to the repair position in the pipeline, make it fit the inner wall of the pipeline, and cover the repair position in the pipeline; S5 subsequent reinforcement: After the covering is completed, the repair location is observed through inspection equipment and the repair location is reinforced.

[0020] See also Figure 2 The present invention provides a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline. The inspection equipment includes a connecting frame 1, a driving wheel 2, a recovery mechanism 3, a connecting body 4, a rotating mechanism 5, a camera module 6, an optimization mechanism 7 and a connecting rope 8. The four outer ends of the connecting frame 1 are all provided with rotatable driving wheels 2, which can drive the inspection equipment to move in the pipeline. The bottom middle end of the connecting frame 1 is provided with a recovery mechanism 3, and the top is connected to the connecting body 4. The front middle end of the connecting body 4 is provided with a camera module 6, and the internal environment of the pipeline can be photographed by the camera module 6 and sent to the terminal at the outer end synchronously, which is beneficial to the observation of the staff. The camera module 6 is rotatable, which is convenient for observing different positions in the pipeline. The front end of the connecting body 4 is provided with a rotating mechanism 5 corresponding to the outer end of the camera module 6. The rear end of the connecting body 4 is connected to the optimization mechanism 7, and the rear end of the optimization mechanism 7 is connected to the connecting rope 8 for pulling the inspection equipment.

[0021] See also Figure 3 The present invention provides a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline. The recovery mechanism 3 includes a bottom basket 31, a collecting bag 32, a dust suction module 33, a collecting pipe 34 and a suction nozzle 35. A group of bottom baskets 31 are provided at the middle end of the bottom of the connecting frame 1. A group of collecting bags 32 are provided on the inner side of the bottom basket 31. The collecting bag 32 is connected to the inner side of the bottom basket 31 through Velcro and can be separated. A group of dust suction modules 33 are connected to the front end opening of the collecting bag 32. A group of collecting pipes 34 are connected to the front end of the dust suction module 33. A suction nozzle 35 is provided at the bottom end of the collecting pipe 34. The dust suction module 33 can suck up impurities in the pipe through the collecting pipe 3 and the suction nozzle 35, and discharge them into the collecting bag 32.

[0022] See also Figure 2-4 The present invention provides a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline. A group of movable grooves 41 corresponding to the connecting body 4 are provided at the top middle end of the connecting frame 1. A group of movable grooves 42 are provided at the bottom middle end of the movable groove 41. A group of screws 43 are connected in the movable grooves 42. A group of moving blocks 44 are provided at the front and rear ends of the screws 43. A group of motors 45 are connected to the front end of the screws 43. The rear end of the driving shaft of the motor 45 is connected to the front end of the screws 43. The rotation of the driving shaft can drive the screws 43 to rotate. The threads at both ends of the screws 43 are opposite. , and the left and right end moving blocks 44 are both provided with corresponding internal threaded holes, the rotation of the screw 43 can drive the two groups of moving blocks 44 to move relative to each other, the top ends of the two groups of moving blocks 44 are connected to the bottom middle end of the connecting body 4 through a group of connecting arms 46, so as to realize the lifting and lowering of the connecting body 4, which can adapt to pipes of different sizes, so that the connecting body 4 is located at the center of the pipe. Furthermore, the front and rear ends on the left and right sides of the movable groove 41 are both provided with flanges, and the left and right sides of the connecting body 4 are both provided with corresponding slide grooves, which can improve the stability of the connecting body 4 when moving.

[0023] See also Figure 5-6 The present invention provides a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline. The rotating mechanism 5 includes a rotating cylinder 51, an annular groove 52, a second motor 53, a gear 54 and a grinding mechanism 55. A group of rotating cylinders 51 are provided at the position of the outer end of the camera module 6 at the front end of the connecting body 4. The rotating cylinder 51 can rotate around the camera module 6. A side of the rotating cylinder 51 close to the connecting body 4 is provided with an annular groove 52, and an inner gear ring is provided on the inner side of the annular groove 52. A group of second motors 53 are installed at the top left of the connecting body 4. The driving shaft of the second motor 53 extends through the annular groove 52 and is connected to a group of gears 54. The gears 54 can mesh with the inner gear ring. The rotation of the driving shaft of the second motor 53 can drive the gear 54 to rotate, thereby driving the rotating cylinder 51 to rotate. A group of grinding mechanisms 55 are provided at the outer end of the rotating cylinder 51.

[0024] See also Figure 5-7 The present invention provides a trenchless repair method for the lining composite pipe of an old coal mine gas pipeline. The grinding mechanism 55 includes a cavity 1 551, a screw 2 552, a motor 2 553, a moving block 2 554, a connecting arm 2 555, a connecting seat 556, a motor 3 557, a grinding disc 558 and a connecting arm 3 559. The outer end of the rotating cylinder 51 is provided with a group of cavities 1 551, a group of screws 2 552 is connected in the cavity 1 551, and a group of motors 2 is connected at the rear end of the screws 2 552. 553, the front end of the driving shaft of the second motor 553 is connected to the rear end of the second screw 552, the driving shaft of the second motor 553 rotates to drive the second screw 552 to rotate, the outer end of the second screw 552 is provided with a group of moving blocks 554, the rotation of the second screw 552 can drive the moving blocks 554 to move along the second screw 552, and a group of connecting arms 555 are hinged at the outer side of the rotating cylinder 51 near the rear end of the cavity 1 551, and the other end of the connecting arm 555 is connected to a group of connecting seats 556, connecting A set of motors 3 557 is installed at the middle end of the seat 556. The drive shaft of the motor 3 557 extends through the outside of the connecting seat 556 and is connected to a set of grinding discs 558. The outer side of the grinding discs 558 is arc-shaped, which can be used to grind and correct the inside of the pipeline to facilitate subsequent repair of the pipeline. A set of connecting arms 3 559 is provided at the middle end of the side of the connecting seat 556 close to the rotating cylinder 51. The other end of the connecting arm 3 559 is connected to the moving block 2 554. The end of the moving block 2 554 away from the screw 2 552 extends through the extending The outer end of the rotating cylinder 51 is extended to be connected with the connecting arm three 559, and a dust-proof brush is provided at the opening of the outer end of the cavity one 551 to prevent impurities from entering therein. When the moving block two 554 moves, the connecting seat 556 and the grinding disc 558 can be pushed outward through the connecting arm three 559 and the connecting arm two 555, so that the grinding disc 558 can contact the inner side of the pipe. Furthermore, a recovery groove is provided on the inner side of the connecting arm two 555, and the connecting arm three 559 can be stored therein, which is conducive to the storage of the connecting arm three 559. See also Figure 8-9 The present invention provides a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline. The optimization mechanism 7 includes a fixed seat 71 and a movable seat 72. The fixed seat 71 is connected to the rear middle end of the connecting body 4. A group of rotating rings 711 are connected to the outer middle end of the fixed seat 71. The rotating ring 711 can rotate at the outer middle end of the fixed seat 71. A group of motors 712 are provided at the inner middle end. The rear end of the fixed seat 71 is connected to the movable seat 72. The rear end of the driving shaft of the motor 712 is connected to the front section of the movable seat 72, which can drive the movable seat 72 to rotate. A set of cavities 2 721 is provided in the movable seat 72. The upper and lower ends of the cavities 2 721 penetrate the movable seat 72 and are connected to the outside. A set of screws 3 722 is connected to the middle end of the cavities 2 721. A set of moving blocks 3 723 is provided on the outside of the screws 3 722. The screws 3 722 rotate to drive the moving blocks 3 723 to move. A set of connecting arms 4 724 is hinged on the upper and lower ends of the moving blocks 3 723. The other ends of the two sets of connecting arms 4 724 penetrate and extend to the outside of the movable seat 72 and are connected to a set of connecting plates 725. A set of friction plates 726 is provided on the other side of the connecting plates 725. The outer side of 6 is arc-shaped to adapt to the curve in the pipeline. The friction plate 726 is connected to the connecting plate 725 through a slot, which is convenient for disassembly and replacement. The friction plate 726 can be used to grind or apply reagents to the inside of the pipeline. The front end of the connecting plate 725 close to the movable seat 72 is connected to the rotating ring 711 through the connecting arm 5 727. When the connecting arm 4 724 drives the connecting plate 725 to rotate, the rotating ring 711 can be driven to rotate. A group of motors 5 728 are installed at the rear end of the movable seat 72. The driving shaft of the motor 5 728 is connected to the rear end of the screw 3 722. The rotation of the driving shaft of the motor 5 728 can drive the screw 3 722 to rotate.

[0025] The present invention provides a trenchless repair method for composite pipes lined with old coal mine gas pipelines. By placing an inspection device into the pipeline, the inspection device can inspect the internal conditions of the pipeline through a camera module 6. When a bulge or other structure that is not conducive to the laying of the repair hose is found inside the pipeline, the second motor 553 can be started to drive the second moving block 554 to move, and then the grinding disc 558 can be driven to move through the second connecting arm 555 and the third connecting arm 559 so that it can approach the bulge. Then, the grinding disc 558 is driven to rotate through the third motor 557 to grind the bulge. After the grinding is completed, the debris can be sucked up through the suction nozzle 35 and the collection pipe 34 to keep the pipeline clean. The movable seat 72 can also be driven to rotate through the fourth motor 712, and the inside of the pipeline can be fully maintained through the friction plate 726. After the repair is completed, the repair position is pressed by the friction plate 726 to improve the repair effect. When facing pipes of different sizes, the screw 43 can be driven to rotate by the motor 45 driving shaft, driving the left and right end moving blocks 44 to move relative to each other. The two groups of moving blocks 44 lift the connecting body 4, so that the connecting body 4, the rotating mechanism 5, the camera module 6 and the optimization mechanism 7 are all located at the center of the pipe to adapt to the repair operations of pipes of different sizes.

[0026] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline, characterized in that: The specific steps are as follows: S1. Block the pipeline: Seal the gas pipeline to be repaired; S2. Detection of emissions: Detect the residual gas in the pipeline and collect and discharge it; S3. Observation and processing: Place the inspection equipment into the pipeline, confirm the repair position of the pipeline, and clean and maintain the inside of the pipeline; S4. Pipeline repair: Pull the repair hose to the repair position in the pipeline, make it fit the inner wall of the pipeline, and cover the repair position in the pipeline; S5 subsequent reinforcement: After the covering is completed, the repair location is observed through inspection equipment and the repair location is reinforced.

2. According to claim 1, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized by: The inspection device comprises a connecting frame (1), a driving wheel (2), a recovery mechanism (3), a connecting body (4), a rotating mechanism (5), a camera module (6), an optimization mechanism (7) and a connecting rope (8); the connecting frame (1) is provided with rotatable driving wheels (2) at the four outer ends; the bottom middle end is provided with a recovery mechanism (3); the top end is connected to the connecting body (4); the front middle end of the connecting body (4) is provided with a camera module (6); the front end of the connecting body (4) is provided with a rotating mechanism (5) at a position corresponding to the outer end of the camera module (6); the rear end of the connecting body (4) is connected to the optimization mechanism (7); and the rear end of the optimization mechanism (7) is connected to the connecting rope (8).

3. According to claim 2, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized by: The recycling mechanism (3) comprises a bottom basket (31), a collection bag (32), a dust collection module (33), a collection pipe (34) and a suction nozzle (35); a bottom basket (31) is provided at the middle bottom end of the connecting frame (1); a collection bag (32) is provided inside the bottom basket (31); a dust collection module (33) is connected to the front end opening of the collection bag (32); a collection pipe (34) is connected to the front end of the dust collection module (33); and a suction nozzle (35) is provided at the bottom end of the collection pipe (34).

4. According to claim 2, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized by: The connecting frame (1) is provided with a group of movable grooves (41) corresponding to the connecting body (4) at the top middle end, and a group of movable grooves (42) are provided at the bottom middle end of the movable grooves (41). A group of screw rods (43) are connected inside the movable grooves (42). A group of moving blocks (44) are provided at the front and rear ends of the screw rods (43), and a group of motors (45) are connected to the front end of the screw rods (43). The top ends of the two groups of moving blocks (44) are connected to the bottom middle end of the connecting body (4) via a group of connecting arms (46).

5. According to claim 4, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized in that: The rotating mechanism (5) comprises a rotating cylinder (51), an annular groove (52), a second motor (53), a gear (54) and a grinding mechanism (55); a rotating cylinder (51) is provided at a position of the front end of the connecting body (4) corresponding to the outer end of the camera module (6); a side of the rotating cylinder (51) close to the connecting body (4) is provided with an annular groove (52); a second motor (53) is connected to the left top end of the connecting body (4); a driving shaft of the second motor (53) extends through the annular groove (52) and is connected to a group of gears (54); and a group of grinding mechanisms (55) is provided at the outer end of the rotating cylinder (51).

6. According to claim 5, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized in that: The grinding mechanism (55) comprises a cavity one (551), a screw rod two (552), a motor two (553), a moving block two (554), a connecting arm two (555), a connecting seat (556), a motor three (557), a grinding disc (558) and a connecting arm three (559); a cavity one (551) is provided at the outer end of the rotating cylinder (51); a screw rod two (552) is connected to the cavity one (551); a motor two (553) is connected to the rear end of the screw rod two (552); a moving block two (554) is provided at the outer end of the screw rod two (552); A second connecting arm (555) is provided at a position near the rear end of the first cavity (551) on the outside of the rotating cylinder (51); the other end of the second connecting arm (555) is connected to a connecting seat (556); a third motor (557) is provided at the middle end inside the connecting seat (556); a driving shaft of the third motor (557) extends through and extends to the outside of the connecting seat (556) and is connected to a grinding disc (558); a third connecting arm (559) is provided at the middle end of one side of the connecting seat (556) near the rotating cylinder (51); the other end of the third connecting arm (559) is connected to the second moving block (554).

7. According to claim 1, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized by: The optimization mechanism (7) comprises a fixed seat (71) and a movable seat (72); the fixed seat (71) is connected to the rear middle end of the connection body (4); a group of rotating rings (711) is provided at the outer middle end of the fixed seat (71); a group of motors (712) is provided at the inner middle end; and the movable seat (72) is connected to the rear end of the fixed seat (71); A group of cavities (721) is provided in the movable seat (72), a group of screw rods (722) is provided at the middle end of the cavity (721), a group of moving blocks (723) are connected to the outside of the screw rods (722), a group of connecting arms (724) are provided at the upper and lower ends of the moving blocks (723), the other ends of the two groups of connecting arms (724) extend through the outside of the movable seat (72) and are connected to a group of connecting plates (725), the other sides of the connecting plates (725) are provided with a group of friction plates (726), the front end of the connecting plate (725) close to the movable seat (72) is connected to the rotating ring (711) through a connecting arm (727), and a group of motors (728) are provided at the rear end of the movable seat (72), the driving shaft of the motors (728) is connected to the rear end of the screw rods (722).

8. A trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline according to claim 7, characterized in that: The outer side of the friction plate (726) is arc-shaped and is connected to the connection plate (725) via a slot.

9. According to claim 5, a trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline is characterized by: An inner gear ring corresponding to the gear (54) is provided on the inner side of the annular groove (52).

10. A trenchless repair method for the inner lining composite pipe of an old coal mine gas pipeline according to claim 4, characterized in that: The threads at both ends of the screw rod (43) are opposite, and corresponding internal thread holes are provided in the movable blocks (44) at the left and right ends.

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