River section fresh water main pipe repairing device

Abstract

The application discloses a river section fresh water main pipe repairing device, which comprises a horizontal directional drilling machine, a plurality of drill rods are assembled on the horizontal directional drilling machine, a reamer is threadedly connected to the end of the last drill rod, the reamer comprises a shell and an obstacle crossing mechanism, the shell is composed of a shell one and a shell two, a crushing piece is arranged on the shell one, the obstacle crossing mechanism comprises a driving assembly, a transmission assembly and an adjusting piece, in the application, when the rock breaking cone encounters hard rock jam, the obstacle crossing mechanism is internally designed, the reamer body can realize instantaneous escape and obstacle crossing without stopping drilling, the unexpected downtime is reduced to the minimum, the work efficiency and the work period controllability are obviously improved, and when the rock breaking cone jam occurs, the torque transmission between the shell and the driving assembly is released, so that the huge rotary shearing force and the radial eccentric load are no longer applied to the weak point which has been engaged.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically relating to a freshwater main pipe repair device for river sections. Background Technology

[0002] Freshwater main pipelines in river sections are susceptible to corrosion and damage due to long-term water erosion and geological subsidence, requiring timely repair to prevent leaks and ensure water supply security. Traditional repair methods, such as dam construction and open-cut excavation, have significant drawbacks including high risk of soil collapse, long construction periods, high costs, and damage to the river's ecosystem. Therefore, trenchless technology has become a safer, more efficient, and environmentally friendly solution, and horizontal directional drilling (LDR) rigs are the core equipment for achieving this technology. A LDR rig is a specialized machine capable of precise pipeline laying and repair without excavating the surface. It uses a ground guidance system to control the direction and depth of the underground drill bit in real time, first drilling a precise guide hole, then using staged hole enlargement to form a stable pipeline channel, and finally dragging in the new pipe or repair materials to complete the construction. This equipment is particularly suitable for sensitive areas such as rivers, effectively avoiding the safety and ecological risks of excavation, significantly shortening the construction period, and reducing costs, making it a key technical means for trenchless pipeline repair in river sections.

[0003] In horizontal directional drilling, the rock-breaking cone on the reamer is mainly used to break hard layers outside the pilot hole. It mainly uses the tip to fracture and cut hard rock layers during rotation. However, in extremely heterogeneous formations, when the tip of the cone cuts into the gaps or protrusions of hard rock layers during rotation, it is very easy to get stuck. Since the rock-breaking cone itself is a rigid structure, once the tip is stuck, the rotating cone instantly becomes a powerful lever, the hard rock layer becomes the fulcrum, and the huge rotational torque is converted into a huge radial force at the stuck point, causing the entire cone to be stuck in the hole. At this time, continuing to rotate is very likely to break the drill rod; while simply pulling back is difficult to get out due to the self-locking effect of the stuck point, which can easily lead to the scrapping of the entire borehole. Current technology lacks an effective instant release mechanism for this, which is a major source of risk in complex formation construction. Summary of the Invention

[0004] The purpose of this invention is to provide a freshwater main pipe repair device for river sections, in order to solve the problem mentioned in the background art that the rock-breaking cone on the borehole expander is prone to wedge-like jamming in hard rock, and its leverage effect generates huge radial force, which can break the drill rod and is difficult to get out, lacking an immediate release mechanism.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a freshwater main pipe repair device for river sections, comprising a horizontal directional drilling rig, wherein multiple drill rods are mounted on the horizontal directional drilling rig, and a hole expander is threadedly connected to the end of the last drill rod, wherein the hole expander comprises a housing and an obstacle-crossing mechanism; The outer shell is composed of shell one and shell two, which can be installed by bolts or by welding; a breakable component is provided on shell one. The obstacle-crossing mechanism includes a drive assembly, a transmission assembly, and an adjustment component; in: One end of the drive assembly is located outside the housing and connected to the drill pipe. The drive assembly rotates synchronously with the drill pipe, while the other end is located inside the housing. The transmission component is radially limited within the housing two. When the transmission component is subjected to a load force not exceeding a set threshold, it is connected to the drive component and drives the entire housing to rotate. When the transmission component is subjected to a load force exceeding the set threshold, it moves axially laterally within the housing two and separates from the drive component. The adjusting component is connected to the crushing component and the transmission assembly respectively. When the transmission assembly moves laterally, the adjusting component pulls the crushing component back into the housing or pushes it out of the housing.

[0006] As a preferred technical solution of the present invention, the driving assembly includes a threaded sleeve, a drive shaft, a turntable, and a drive block; The threaded sleeve and the turntable are respectively fixed at both ends of the drive shaft, and the threaded sleeve is placed outside the housing, and its inner wall is provided with threads for connecting to the drill rod. The drive block is fixed at an equal angle to the end face of the turntable, and one side of the drive block is an inclined surface. A sealed bearing is also fitted on the outer side of the end of the drive shaft near the threaded sleeve. The sealed bearing is placed inside the port of the housing. The sealing bearing ensures the normal rotation of the drive shaft and seals the connection between the two, preventing mud from seeping in.

[0007] As a preferred technical solution of the present invention, an end plate is fixedly provided inside the housing 2, and a limiting rod is fixedly provided at the center of the end plate; a through hole is provided at the center of the threaded sleeve, the drive shaft, and the turntable, and one end of the limiting rod passes through the through hole and extends into the threaded sleeve. The end of the limiting rod is threaded, and the entire drive assembly is supported and limited by screwing on a nut, ensuring that the drive assembly always coincides with the axis of the housing and that its own installation position remains unchanged, and that it will not separate from the housing.

[0008] As a preferred technical solution of the present invention, the transmission assembly includes a mounting plate, a limiting rod, a spring, and a docking block; The mounting plate is located between the end plate and the turntable, and a through hole for the limiting rod to pass through is also provided at the center of the mounting plate. The limiting rod is fixed at an equal angle to the outside of the mounting plate, and the limiting rod and the end plate are movably connected. By setting the limiting rod, the end plate can be ensured to move laterally within the housing. At the same time, the rotational force generated when the mounting plate rotates can be transmitted to the entire housing through the limiting rod, thereby realizing the rotation of the housing. The spring is sleeved on the limiting rod, and the two ends of the spring abut against the mounting plate and the end plate, respectively. The docking block is fixed at an equal angle to the inside of the mounting plate, and one side of the docking block is an inclined surface. The inclined surfaces of the drive block and the docking block are in contact. When the drive assembly rotates, the force is transmitted to the docking block through the drive block. At this time, under the spring's rebounding action, the docking block always remains in contact with the drive block, thus transmitting the rotational force of the drive block to the mounting plate. The limit rod drives the end plate to rotate, ultimately realizing the rotation of housing two and housing one. When the spring's rebounding force cannot guarantee that the docking block and the drive block are in contact, the drive block will push the docking block towards the end plate through its own inclined surface and the inclined surface of the docking block during rotation. At this time, the mounting plate and the limit rod move horizontally, and the docking block no longer abuts against the drive block, but instead becomes in contact. When the drive assembly continues to rotate, the spring will rebound again, and the docking block will rebound again, realizing the state of contact between the drive block and the docking block.

[0009] As a preferred technical solution of the present invention, a retaining ring is also installed at the through hole position of the mounting plate. The retaining ring is sleeved on the limiting rod, and the limiting rod can be supported by the retaining ring, so that the limiting rod has an additional support point in the housing and the overall support strength of the limiting rod is improved.

[0010] As a preferred technical solution of the present invention, the crushing components are arranged at equal angles on the shell, and each set of crushing components includes a rock-breaking cone, a connecting plate, and a connecting column; The rock-breaking cones are arranged at equal intervals, and the rock-breaking cones are arranged inclined from bottom to top as a whole; The connecting plate is fixed on the bottom end face of the multiple rock-breaking cones, while the connecting column is fixed at the midpoint of the bottom end face of the connecting plate.

[0011] As a preferred technical solution of the present invention, the adjusting member is provided in multiple sets, and each set of adjusting members corresponds to a crushing member; wherein, one end of the adjusting member is rotatably connected to the connecting column, and the other end is fixedly connected to the mounting plate. When the mounting plate moves laterally toward the end plate, the adjusting member drives the crushing member to move downward; when the mounting plate moves laterally away from the end plate, the adjusting member drives the crushing member to move upward.

[0012] As a preferred technical solution of the present invention, the adjusting component includes a shaft, a connecting rod one, a connecting rod two, and a push-pull plate; One end of the push-pull plate is fixed to the mounting plate and moves horizontally synchronously with the mounting plate; One end of the second connecting rod is provided with a moving groove, and the other end of the push-pull plate is fixed with a protrusion that is inserted into the moving groove. The other end of the second connecting rod is rotatably connected to one end of the first connecting rod. The other end of the connecting rod is rotatably connected to the connecting column. Two shafts are provided, each passing through the center of connecting rod one and connecting rod two respectively. One end of each shaft is fixed to the inner wall of housing one. When the rock-breaking cone is jammed, the mounting plate cannot continue to drive the housing to rotate. At this time, the rotational force generated by the drive block will exceed the spring's restoring force and will not be able to drive the docking block to rotate. Through the abutment between the drive block and the inclined surface of the docking block, the mounting plate will be moved laterally towards the end plate. At this time, the push-pull plate will be pulled by the mounting plate. The protrusion at the other end of the push-pull plate will move in the moving groove and pull one end of connecting rod two downward. At this time, connecting rod two rotates around the shaft, while the other end of connecting rod two tilts upward. The mechanism starts, simultaneously lifting one end of connecting rod one and lowering the other end. As the other end of connecting rod one descends, it causes the connecting column to descend as a whole, pulling the rock-breaking cone back from the hard rock into the housing one, thus achieving separation and preventing jamming. After the rock-breaking cone separates, the drive block will also pass over one docking block and move to the position of another docking block. At this time, the spring rebounds, returning the mounting plate to its original position and re-attaching it to the drive block. Simultaneously, the mounting plate, now back in its original position, will push the push-pull plate, thus allowing the rock-breaking cone to re-penetrate the outside of the housing one for continued subsequent crushing operations.

[0013] As a preferred technical solution of the present invention, the edge of the turntable away from the drive block is chamfered, and the connecting rod two and the turntable do not contact each other in the rotating state.

[0014] As a preferred technical solution of the present invention, the outer end of the second housing is also fixed with an integral connector, which is connected to an external pipe through a connection structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, an internally designed obstacle-crossing mechanism enables the reamer to instantly escape and cross obstacles when the rock-breaking cone encounters hard rock and becomes stuck, without stopping drilling. This minimizes unexpected downtime, significantly improving efficiency and schedule controllability. Furthermore, when the rock-breaking cone becomes stuck, the obstacle-crossing mechanism releases the torque transmission between the outer shell and the drive assembly, preventing the enormous rotational shear force and radial off-center load from acting on the already engaged weak point. This fundamentally avoids chain mechanical failures such as drill rod breakage or cutterhead structure damage, greatly reducing equipment damage risks and maintenance costs. Through this invention, the adaptability and engineering reliability of the entire pipeline laying system in complex strata are enhanced, reducing the over-reliance on real-time experience judgment of operators. By automatically responding to geological changes through preset mechanical logic, unpredictable jamming risks are transformed into manageable procedural steps, effectively improving the success rate of single crossings and expanding the applicability of trenchless technology in extremely heterogeneous geological conditions. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of the freshwater main pipeline repair device for a river section; Figure 2 This is a schematic diagram of the hole expander. Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the obstacle-crossing mechanism; Figure 5 This is a schematic diagram of the drive component. Figure 6 This is a schematic diagram showing the connection between the transmission assembly and the limit rod; Figure 7 This is a schematic diagram showing the connection between the crushing component and the adjusting component.

[0017] In the picture: 100. Horizontal directional drilling rig; 101. Drill rod; 200. Outer casing; 200a, Shell 1; 200b, housing two; 200b-1, end plate; 200b-2, limiting rod; 201. Connector; 202. Sealed bearing; 203, Crushing component; 203a, Rock-breaking cone; 203b, Connecting plate; 203c, Connecting column; 204. Holding ring; 301. Shaft; 302. Connecting rod one; 303, Linkage 2; 303a, Moving slot; 304 stainless steel, push-pull panel; 400. Driver components; 401. Threaded sleeve; 402. Drive shaft; 403. Turntable; 404. Drive block; 500. Transmission components; 501. Mounting plate; 502. Limiting rod; 503. Spring; 504. Connecting block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 7 The present invention provides a technical solution: a freshwater main pipe repair device for river sections, including a horizontal directional drilling rig 100, on which multiple drill rods 101 are mounted, and a hole expander is threadedly connected to the end of the last drill rod 101. The hole expander includes a housing 200 and an obstacle-crossing mechanism. The outer shell 200 is composed of a first shell 200a and a second shell 200b, which can be installed by bolts or by welding; a breakable part 203 is provided on the first shell 200a; The obstacle-crossing mechanism includes a drive assembly 400, a transmission assembly 500, and an adjusting component; in: One end of the drive assembly 400 is located outside the housing 200a and connected to the drill rod 101. The drive assembly 400 rotates synchronously with the drill rod 101, while the other end is located inside the housing 200a. The transmission component 500 is radially limited within the housing 200b. When the transmission component 500 is subjected to a load force not exceeding a set threshold, it is connected to the drive component 400 and drives the entire housing 200 to rotate. When the transmission component 500 is subjected to a load force exceeding the set threshold, it moves axially laterally within the housing 200b and separates from the drive component 400. The adjusting component is connected to the crushing component 203 and the transmission assembly 500 respectively. When the transmission assembly 500 moves laterally, the adjusting component pulls the crushing component 203 back into the housing 200a or pushes it out of the housing 200a.

[0020] In this embodiment, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 The drive assembly 400 includes a threaded sleeve 401, a drive shaft 402, a turntable 403, and a drive block 404. The threaded sleeve 401 and the turntable 403 are respectively fixed at both ends of the drive shaft 402, and the threaded sleeve 401 is placed outside the housing 200a, and its inner wall is provided with threads for connecting to the drill rod 101. The drive block 404 is fixed at an equal angle to the end face of the turntable 403, and one side of the drive block 404 is an inclined surface; A sealed bearing 202 is also fitted on the outer side of the end of the drive shaft 402 near the threaded sleeve 401. The sealed bearing 202 is placed inside the port of the housing 200a. The sealing bearing 202 can ensure the normal rotation of the drive shaft 402 and also achieve the sealing at the connection between the two to prevent mud from seeping in.

[0021] In this embodiment, refer to Figure 3 , Figure 6 An end plate 200b-1 is fixed inside the housing 200b. A limiting rod 200b-2 is also fixed at the center of the end plate 200b-1. A through hole is formed at the center of the threaded sleeve 401, the drive shaft 402, and the turntable 403. One end of the limiting rod 200b-2 passes through the through hole and extends into the threaded sleeve 401. The end of the limiting rod 200b-2 is threaded. By screwing on a nut, the entire drive assembly 400 is supported and limited, ensuring that the drive assembly 400 always coincides with the axis of the housing 200 and that its own installation position remains unchanged, and that it will not separate from the housing 200.

[0022] In this embodiment, refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 The transmission assembly 500 includes a mounting plate 501, a limit rod 502, a spring 503, and a docking block 504; The mounting plate 501 is located between the end plate 200b-1 and the turntable 403. The center of the mounting plate 501 is also provided with a through hole for the limiting rod 200b-2 to pass through. The limiting rod 502 is fixed at an equal angle on the outside of the mounting plate 501, and the limiting rod 502 is movable through the end plate 200b-1. By setting the limiting rod 502, the end plate 200b-1 can be ensured to move laterally within the housing 200b. At the same time, the rotational force generated when the mounting plate 501 rotates can be transmitted to the entire housing 200 through the limiting rod 502, so as to realize the rotation of the housing 200. Spring 503 is sleeved on limit rod 502, and both ends of spring 503 abut against mounting plate 501 and end plate 200b-1 respectively; The mating block 504 is fixed at an equal angle to the inside of the mounting plate 501, and one side of the mating block 504 is an inclined surface; In this configuration, the inclined surfaces of the drive block 404 and the mating block 504 are in contact. When the drive assembly 400 rotates, the force is transmitted to the mating block 504 through the drive block 404. At this time, under the rebounding and pressing action of the spring 503, the mating block 504 remains in contact with the drive block 404, thus transmitting the rotational force of the drive block 404 to the mounting plate 501. The end plate 200b-1 is then rotated via the limit rod 502, ultimately achieving the rotation of the second housing 200b and the first housing 200a. The rebound force generated by the spring 503... If it cannot be guaranteed that the mating block 504 and the driving block 404 are in contact, the driving block 404 will push the mating block 504 toward the end plate 200b-1 during rotation by using its own inclined surface and the inclined surface of the mating block 504. At this time, the mounting plate 501 and the limit rod 502 will move horizontally, and the mating block 504 will no longer abut against the driving block 404, but will instead be in contact. When the driving assembly 400 continues to rotate, the spring 503 will rebound, and the mating block 504 will rebound again, realizing the contact state between the driving block 404 and the mating block 504.

[0023] In this embodiment, refer to Figure 3 and Figure 6 A retaining ring 204 is also installed at the through hole position of the mounting plate 501. The retaining ring 204 is sleeved on the limiting rod 200b-2. The retaining ring 204 can support the limiting rod 200b-2, so that the limiting rod 200b-2 has an additional support point within the housing 200b, thereby improving the overall support strength of the limiting rod 200b-2. The retaining ring 204 and the mounting plate 501 are only connected and do not rotate synchronously. The main function of the retaining ring 204 is to be installed on the mounting plate 501 and to provide a support point for the limiting rod 200b-2. Regardless of whether the position of the mounting plate 501 changes, the support point always exists. Therefore, the retaining ring 204 will not be affected by the lateral movement of the mounting plate 501.

[0024] In this embodiment, refer to Figure 2 , Figure 3 , Figure 4 , Figure 7 The crushing components 203 are set at equal angles on the shell 200a. Each set of crushing components 203 includes a rock-breaking cone 203a, a connecting plate 203b, and a connecting column 203c. Multiple rock-breaking cones 203a are set at equal intervals, and the multiple rock-breaking cones 203a are arranged inclined from bottom to top as a whole; The connecting plate 203b is fixed on the bottom end face of multiple rock-breaking cones 203a, while the connecting column 203c is fixed at the midpoint of the bottom end face of the connecting plate 203b.

[0025] In this embodiment, refer to 3. Figure 4 , Figure 7The adjustment components are provided in multiple sets, with each set corresponding to a crusher 203. One end of the adjustment component is rotatably connected to the connecting column 203c, and the other end is fixedly connected to the mounting plate 501. When the mounting plate 501 moves laterally toward the end plate 200b-1, the adjustment component causes the crusher 203 to move downward; when the mounting plate 501 moves laterally away from the end plate 200b-1, the adjustment component causes the crusher 203 to move upward.

[0026] In this embodiment, refer to 3. Figure 4 , Figure 7 The adjusting components include shaft 301, connecting rod one 302, connecting rod two 303, and push-pull plate 304; One end of the push-pull plate 304 is fixed to the mounting plate 501 and moves horizontally synchronously with the mounting plate 501; One end of the connecting rod 2 303 is provided with a moving groove 303a, and the other end of the push-pull plate 304 is fixed with a protrusion that is inserted into the moving groove 303a. The other end of the connecting rod 2 303 is rotatably connected to one end of the connecting rod 1 302. The other end of connecting rod 302 is rotatably connected to connecting post 203c; Two shafts 301 are provided, and the two shafts 301 pass through the center positions of connecting rod one 302 and connecting rod two 303 respectively. One end of the shaft 301 is fixed to the inner wall of housing one 200a. When the rock-breaking cone 203a is stuck, the mounting plate 501 can no longer drive the housing 200 to rotate. At this time, the rotational force generated by the drive block 404 will exceed the restoring force of the spring 503 and cannot drive the docking block 504 to rotate. Through the abutment between the inclined surface of the drive block 404 and the docking block 504, the mounting plate 501 will be moved laterally towards the end plate 200b-1. At this time, the push-pull plate 304 will be pulled by the mounting plate 501. At this time, the protrusion at the other end of the push-pull plate 304 will move in the moving groove 303a and pull one end of the connecting rod two 303 downward. At this time, the connecting rod two 303 rotates around the shaft 301, and the connecting rod The other end of the second 303 tilts up, simultaneously causing one end of the first connecting rod 302 to tilt up as well, and causing the other end of the first connecting rod 302 to descend. When the other end of the first connecting rod 302 descends, it will cause the connecting column 203c to descend as a whole, so that the rock-breaking cone 203a is pulled back from the hard rock into the shell 200a, thereby achieving separation and avoiding jamming. After the rock-breaking cone 203a is separated, the drive block 404 will also pass over one docking block 504 and move to the position of another docking block 504. At this time, the spring 503 rebounds, returning the mounting plate 501 to its original position and making it fit with the drive block 404 again. At the same time, the mounting plate 501, which has returned to its original position, will also push the push-pull plate 304, thereby allowing the rock-breaking cone 203a to re-penetrate the outside of the shell 200a and continue the subsequent crushing operation.

[0027] In this embodiment, Figure 3 , Figure 4 , Figure 5 The edge of the turntable 403 facing away from the drive block 404 is chamfered. The connecting rod 303 and the turntable 403 do not contact each other during rotation, thus avoiding motion interference.

[0028] In this embodiment, refer to Figure 2 , Figure 3 The outer end of the housing 200b is also fixed with an integral connector 201, which is connected to an external pipe through a connection structure.

[0029] The working principle of the repair device is explained below: During construction, the guide drill rod 101 is first installed on the horizontal directional drilling rig 100 and pushed into the ground by the rotation of the rig 100. Then, multiple drill rods 101 are installed sequentially and pushed into the ground to achieve underground drilling from the riverbed to the river channel, thus opening the guide hole. After the guide hole is opened, the guide drill rod 101 is removed, and a reamer is installed. The end of the reamer is connected to the pipeline via a connecting structure. At this time, the horizontal directional drilling rig 100 rotates and pulls back, enlarging the guide hole through the outer casing 200, which has a diameter larger than the guide hole, and pulling in a new pipeline for repair and laying. As the outer casing 200 rotates with the drill rod 101, once the rock-breaking cone 203a gets stuck in the hard rock layer, the drill rod 101... 1 will still drive the drive assembly 400 to rotate. After being resisted by the housing 200, the drive assembly 400 will separate from the transmission assembly 500 and idle inside the housing 200 to prevent the drill rod 101 from getting stuck with the horizontal directional drilling machine 100. During this period, the rock breaking cone 203a will be pulled back into the housing 200a by the mounting plate 501 and the adjusting component and will detach from the hard rock layer. At the same time, the drive assembly 400 will pull the housing 200 to continue moving and make the housing 200 cross the hard rock layer. At this time, the rock breaking cone 203a will be pushed back into the outside of the housing 200a by the spring 503 with the help of the mounting plate 501 and the adjusting component to work, while the pipe continues to follow the housing 200 forward.

[0030] Although embodiments of the invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A freshwater main pipe repair device for a river section, comprising a horizontal directional drilling rig (100), wherein multiple drill rods (101) are mounted on the horizontal directional drilling rig (100), and a borehole expander is threadedly connected to the end of the last drill rod (101), characterized in that: The hole expander includes a housing (200) and an obstacle-crossing mechanism; The outer shell (200) is composed of shell one (200a) and shell two (200b), and a breakable part (203) is provided on shell one (200a). The obstacle-crossing mechanism includes a drive assembly (400), a transmission assembly (500), and an adjusting component; in: One end of the drive assembly (400) is placed outside the housing (200a) and connected to the drill rod (101). The drive assembly (400) rotates synchronously with the drill rod (101), while the other end is inside the housing (200a). The transmission assembly (500) is radially limited within the housing (200b). When the transmission assembly (500) is subjected to a load force not exceeding a set threshold, it is connected to the drive assembly (400) and drives the entire housing (200) to rotate. When the transmission assembly (500) is subjected to a load force exceeding the set threshold, it moves axially laterally within the housing (200b) and separates from the drive assembly (400). The adjusting component is connected to the crushing component (203) and the transmission assembly (500) respectively. When the transmission assembly (500) moves laterally, the adjusting component pulls the crushing component (203) back into the housing (200a) or pushes it out of the housing (200a).

2. The freshwater main pipe repair device for river sections according to claim 1, characterized in that: The drive assembly (400) includes a threaded sleeve (401), a drive shaft (402), a turntable (403), and a drive block (404). The threaded sleeve (401) and the turntable (403) are respectively fixed at both ends of the drive shaft (402), and the threaded sleeve (401) is placed outside the housing (200a), and its inner wall is provided with threads for connecting to the drill rod (101). The drive block (404) is fixed at an equal angle to the end face of the turntable (403), and one side of the drive block (404) is an inclined surface; A sealed bearing (202) is also fitted on the outer side of the end of the drive shaft (402) near the threaded sleeve (401), and the sealed bearing (202) is placed inside the port of the housing (200a).

3. The freshwater main pipe repair device for river sections according to claim 2, characterized in that: An end plate (200b-1) is fixed inside the housing (200b), and a limiting rod (200b-2) is fixed at the center of the end plate (200b-1); a through hole is formed at the center of the threaded sleeve (401), the drive shaft (402), and the turntable (403), and one end of the limiting rod (200b-2) passes through the through hole and extends into the threaded sleeve (401), and the end of the limiting rod (200b-2) is threaded.

4. The freshwater main pipe repair device for river sections according to claim 3, characterized in that: The transmission assembly (500) includes a mounting plate (501), a limiting rod (502), a spring (503), and a docking block (504); The mounting plate (501) is located between the end plate (200b-1) and the turntable (403). The center of the mounting plate (501) is also provided with a through hole for the limiting rod (200b-2) to pass through. The limiting rod (502) is fixed at an equal angle to the outside of the mounting plate (501), and the limiting rod (502) and the end plate (200b-1) are movably connected through each other; The spring (503) is sleeved on the limiting rod (502), and the two ends of the spring (503) abut against the mounting plate (501) and the end plate (200b-1) respectively; The docking block (504) is fixed at an equal angle to the inside of the mounting plate (501), and one side of the docking block (504) is an inclined surface; The inclined surfaces of the drive block (404) and the docking block (504) are in contact.

5. A freshwater main pipe repair device for river sections according to claim 4, characterized in that: A retaining ring (204) is also installed at the through hole position of the mounting plate (501), and the retaining ring (204) is sleeved on the limiting rod (200b-2).

6. A freshwater main pipe repair device for river sections according to claim 4, characterized in that: The crushing components (203) are arranged at equal angles on the first shell (200a). Each set of crushing components (203) includes a rock-breaking cone (203a), a connecting plate (203b), and a connecting column (203c). Multiple rock-breaking cones (203a) are arranged at equal intervals, and the multiple rock-breaking cones (203a) are arranged inclined from bottom to top as a whole; The connecting plate (203b) is fixed on the bottom end face of the plurality of rock-breaking cones (203a), while the connecting column (203c) is fixed at the midpoint of the bottom end face of the connecting plate (203b).

7. A freshwater main pipe repair device for river sections according to claim 6, characterized in that: The adjusting component is provided in multiple sets, and each set of adjusting components corresponds to a crushing component (203); one end of the adjusting component is rotatably connected to the connecting column (203c), and the other end is fixedly connected to the mounting plate (501). When the mounting plate (501) moves laterally toward the end plate (200b-1), the adjusting component drives the crushing component (203) to move downward; when the mounting plate (501) moves laterally away from the end plate (200b-1), the adjusting component drives the crushing component (203) to move upward.

8. A freshwater main pipe repair device for river sections according to claim 7, characterized in that: The adjusting component includes a shaft (301), a connecting rod one (302), a connecting rod two (303), and a push-pull plate (304). One end of the push-pull plate (304) is fixed on the mounting plate (501) and moves horizontally synchronously with the mounting plate (501); One end of the second connecting rod (303) is provided with a moving groove (303a), and the other end of the push-pull plate (304) is fixed with a protrusion that is inserted into the moving groove (303a). The other end of the second connecting rod (303) is rotatably connected to one end of the first connecting rod (302). The other end of the connecting rod (302) is rotatably connected to the connecting column (203c); Two shafts (301) are provided, and the two shafts (301) pass through the center positions of connecting rod one (302) and connecting rod two (303) respectively. One end of the shaft (301) is fixed to the inner wall of housing one (200a).

9. A freshwater main pipe repair device for river sections according to claim 8, characterized in that: The turntable (403) has a chamfered edge on the side opposite to the drive block (404), and the connecting rod (303) and the turntable (403) do not contact each other when rotating.

10. A freshwater main pipe repair device for river sections according to claim 1, characterized in that: The outer end of the second housing (200b) is also fixed with an integral connector (201), which is connected to an external pipe through a connection structure.

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