Pipeline directional drilling and reaming device

Abstract

The invention discloses a pipeline directional drilling and chambering device, and belongs to the technical field of trenchless directional drilling construction technology, the pipeline directional drilling and chambering device comprises a center shaft and a plurality of fixing blocks fixed on the periphery of the center shaft, cutting wheels are mounted on the fixing blocks, the periphery of the center shaft is sleeved with a wear-resistant disc, a moving groove is formed in the side surface of each fixing block, and the cutting wheels are mounted on the moving grooves. A moving groove is formed in the fixed block, a moving rod is installed on the fixed block in a sliding mode through the moving groove, a connecting block is fixed to the end of the moving rod, the cutting wheel can be fixedly connected with the connecting block in a clamped mode, and a control assembly used for controlling the position of the moving rod is arranged on the fixed block. When a large-size cutting wheel is replaced, the distance between every two adjacent connecting blocks can be increased, the replaced large-size cutting wheel is not prone to being touched, and therefore the construction effect is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of trenchless directional drilling construction technology, and in particular to a pipeline directional drilling and hole expansion device. Background Art

[0002] In modern pipeline construction, especially in urban underground pipeline networks, oil and gas transportation and other large-scale infrastructure construction, pipeline directional drilling technology is widely used. Pipeline directional drilling construction technology is a technology that detects, inspects, replaces and lays various underground public facilities such as pipelines and cables without excavating the surface. It has the advantages of little impact on the environment, no impact on traffic and navigation, small construction area, short construction period and relatively low cost.

[0003] Directional drilling construction of pipelines begins with the use of a directional drill and a guide drill bit. After the guide drilling is completed, the hole diameter is usually small and needs to be enlarged to ensure that the hole diameter can accommodate the required pipe. An enlargement tool is used to enlarge the hole along the guide hole. Usually, the enlargement tool is installed behind the drill bit and the hole diameter is expanded by rotation and advancement. Depending on the specifications of the pipeline and the formation it passes through, it may be necessary to enlarge the hole multiple times, using enlargement tools of different sizes each time to gradually increase the hole diameter.

[0004] For example, a Chinese patent with the announcement number CN117662009 A discloses a pipeline directional drilling and reaming device, which includes a central axis, a plurality of fixed blocks are fixed on the outer periphery of the central axis, a rotating shaft is fixed on the fixed blocks, and a cutting wheel is detachably and rotatably connected to the rotating shaft through a limit bolt, and different hole reaming sizes can be completed by replacing cutting wheels of different sizes. However, the plurality of cutting wheels are arranged at intervals along the circumference of the central axis, and when a large-sized cutting wheel needs to be replaced, if the length of the rotating shaft does not change, two adjacent cutting wheels may touch each other, affecting the construction effect. Summary of the invention

[0005] In order to improve the problem that two adjacent cutting wheels may touch each other when replacing a large-sized cutting wheel, the present application provides a pipeline directional drilling and expanding device.

[0006] The present application provides a pipeline directional drilling and reaming device that adopts the following technical solution: A pipeline directional drilling and reaming device comprises a central shaft and a plurality of fixed blocks fixed to the periphery of the central shaft, a cutting wheel is mounted on the fixed block, a wear-resistant disk is sleeved on the periphery of the central shaft, a movable groove is opened on the side of the fixed block, a movable rod is slidably mounted on the fixed block through the movable groove, a connecting block is fixed at the end of the movable rod, the cutting wheel can be clamped and fixed to the connecting block, and a control component for controlling the position of the movable rod is arranged on the fixed block.

[0007] By adopting the above technical solution, the cutting wheel is fixed to the connecting block. When a larger-sized cutting wheel needs to be replaced, the control component is used to drive the moving rod to move in a direction away from the fixed block, so that the distance between two adjacent connecting blocks becomes larger, making it difficult for the replaced large-sized cutting wheel to touch each other, thereby ensuring the construction effect.

[0008] Preferably, the control component includes a moving block, which is rotatably connected to the end face of the moving rod away from the cutting wheel, and the outer peripheral surface of the moving block is provided with a giveway hole, in which a giveway rod is passed, and a giveway groove is provided in the fixed block, and the giveway rod slides with the fixed block along the radial direction of the central axis through the giveway groove, and a pushing component for pushing a plurality of the giveway rods to move synchronously is provided on the central axis.

[0009] By adopting the above technical solution, the pushing assembly is used to drive a plurality of levers to move away from the central axis, and then the levers drive the moving block to move away from the central axis, thereby increasing the distance between two adjacent cutting wheels.

[0010] Preferably, the pushing assembly includes a limiting ring sleeved on the outer periphery of the central shaft, the limiting ring being rotatably connected to the central shaft, a plurality of fan-shaped pieces are fixed to the outer periphery of the limiting ring, the fan-shaped pieces correspond one to one with the yielding rods, an arc-shaped groove is provided on the side of the fan-shaped piece close to the fixed block, the yielding rod is slidably engaged with the fan-shaped piece through the arc-shaped groove, one end of the arc-shaped groove is arranged close to the limiting ring, and the other end of the arc-shaped groove is arranged in a direction away from the limiting ring.

[0011] By adopting the above technical solution, the limit ring is rotated, and the limit ring drives a plurality of sector pieces to rotate synchronously. The sector pieces drive the yield rods to move through the arc grooves, thereby causing the plurality of yield rods to move radially along the central axis.

[0012] Preferably, a limiting hole is provided on the outer circumferential surface of the limiting ring, and a plurality of limiting grooves are provided on the outer circumferential surface of the central axis, and the plurality of limiting grooves are arranged at equal intervals along the circumference of the central axis. A limiting screw is passed through the limiting hole, and the limiting screw is threadedly connected to the limiting hole, and the limiting screw can be inserted into the limiting groove.

[0013] By adopting the above technical solution, the limiting ring is rotated to adjust the position of the yielding rod, and the limiting hole is aligned with the limiting groove, and the limiting screw is inserted into the aligned limiting hole and limiting groove to fix the limiting ring.

[0014] Preferably, a connecting groove for inserting the connecting block is provided on the side of the cutting wheel, a plurality of clamping grooves are provided on the outer peripheral surface of the connecting block, the connecting block is installed with a clamping block by sliding along its own radial direction through the clamping groove, and a clamping groove for inserting the clamping block is provided on the inner wall of the connecting groove.

[0015] By adopting the above technical solution, the cutting wheel is sleeved on the outer circumference of the connecting block, the connecting block is inserted into the connecting groove, and then the clamping block is inserted into the clamping groove to clamp and fix the cutting wheel and the connecting block.

[0016] Preferably, an abutment block is fixed on the side of the clamping block, and an abutment groove is provided on the inner wall of the clamping groove. The abutment block slides and cooperates with the connecting block along the radial direction of the connecting block through the abutment groove. A spring is fixed on the side of the abutment block away from the cutting wheel, and one end of the spring away from the abutment block is fixedly connected to the inner wall of the abutment groove. A slope is provided on the side of the clamping block close to the cutting wheel, and the slope is located on the side of the clamping block away from the fixed block.

[0017] By adopting the above technical solution, the cutting wheel is sleeved on the outer circumference of the connecting block, the cutting wheel abuts against the inclined surface 1 and pushes the card block into the card slot, and after the card slot is aligned with the card slot, the card block is inserted into the card slot under the elastic force of spring 1.

[0018] Preferably, an electromagnet is fixed on the inner wall of the card slot away from the cutting wheel, and the electromagnet can attract the card block when energized, and a control groove is provided on the inner wall of the central shaft, and a control block is installed on the central shaft through the control groove to slide along its own radial direction, and a pressure block is fixed on the outer peripheral surface of one of the yield rods, and the pressure block can abut against the control block, and a moving plate is fixed on the side of the control block away from the pressure block, and a fixed plate is fixed on the inner wall of the control groove away from the pressure block, and the fixed plate can electrically contact the moving plate, the fixed plate is electrically connected to a power supply, and the moving plate is electrically connected to the electromagnet, and a reset block is fixed on the side of the control block, and a reset groove is provided on the inner wall of the control groove, and the reset block slides with the central shaft along the radial direction of the central shaft through the reset groove, and a reset spring is fixed on the side of the reset block away from the pressure block, and one end of the reset spring away from the reset block is fixedly connected to the inner wall of the reset groove.

[0019] By adopting the above technical solution, when the cutting wheel needs to be disassembled, the limit ring is rotated to make the pressure block move toward the direction close to the central axis, the pressure block abuts against the control block and pushes the control block to move toward the direction close to the fixed plate, so that the movable plate and the fixed plate are electrically contacted, the electromagnet is energized to work, the electromagnet attracts the clamping block, and the clamping block is disengaged from the clamping groove, so as to facilitate the disassembly of the cutting wheel.

[0020] Preferably, a fixing ring is provided on the outer periphery of the central shaft, and the fixing ring is rotatably connected to the central shaft. A plurality of mounting grooves are provided on the side of the wear-resistant disk close to the fixing ring. The wear-resistant disk is slidably mounted with a mounting rod along the length direction of the central shaft through the mounting groove. The end face of the mounting rod is fixedly connected to the fixing ring. A mounting spring is fixed to the end face of the mounting rod away from the fixing ring. One end of the mounting spring away from the mounting rod is fixedly connected to the inner wall of the mounting groove. A positioning ring is provided on the outer periphery of the central shaft, and the positioning ring can abut against the side of the wear-resistant disk away from the fixing ring.

[0021] By adopting the above technical solution, the wear-resistant disc abuts against the positioning ring under the elastic force of the installation spring, so that the wear-resistant disc can be displaced along the length direction of the central axis to facilitate the wear-resistant disc to crush the stone.

[0022] Preferably, a positioning hole is provided on the outer circumference of the positioning ring, and a plurality of positioning grooves are provided on the outer circumference of the center shaft. The plurality of positioning grooves are arranged at equal intervals along the length direction of the center shaft. A positioning screw is passed through the positioning hole, and the positioning screw is threadedly connected to the positioning hole, and the positioning screw can be inserted into the positioning groove.

[0023] By adopting the above technical solution, after the cutting wheel is replaced with a large size, the positioning ring is moved in the direction away from the fixed block, and the positioning hole is aligned with the positioning groove, and then the positioning screw is inserted into the positioning hole and the positioning groove to fix the positioning ring.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The cutting wheel is fixed with the connecting block. When a larger cutting wheel needs to be replaced, the control assembly is used to drive the moving rod to move away from the fixed block, so that the distance between two adjacent connecting blocks becomes larger, making it difficult for the replaced large-size cutting wheel to touch, thereby ensuring the construction effect; 2. Rotate the limit ring, which drives several sector pieces to rotate synchronously. The sector pieces drive the yield rods to move through the arc grooves, thereby causing several yield rods to move radially along the central axis; 3. When the cutting wheel needs to be disassembled, rotate the limit ring to move the pressure block toward the direction close to the central axis. The pressure block abuts against the control block and pushes the control block toward the direction close to the fixed plate, so that the movable plate is electrically contacted with the fixed plate. The electromagnet is energized to work, and the electromagnet attracts the clamping block, which disengages from the clamping groove to facilitate the disassembly of the cutting wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the pipeline directional drilling and expanding device according to an embodiment of the present application.

[0026] Figure 2 It is a cross-sectional view of the central axis and the wear-resistant disk in the pipeline directional drilling and expanding device according to an embodiment of the present application.

[0027] Figure 3 It is a schematic diagram of the installation structure of the yield rod and the fan-shaped piece in the pipeline directional drilling and expanding device of the embodiment of the present application.

[0028] Figure 4 It is a cross-sectional view of a cutting wheel and a connecting block in a pipeline directional drilling and reaming device according to an embodiment of the present application.

[0029] Figure 5 yes Figure 2 A magnified schematic diagram of center A.

[0030] Reference numerals: 1, central axis; 11, fixed block; 12, cutting wheel; 121, connecting groove; 122, clamping groove; 13, wear-resistant disc; 14, mounting groove; 15, mounting rod; 16, mounting spring; 2, moving rod; 21, moving groove; 22, moving block; 23, clearance hole; 24, clearance rod; 241, pressing block; 25, clearance groove; 3, limiting ring; 31, sector piece; 32, arc groove; 33, limiting groove; 34 , limit hole; 35, limit screw; 4, connecting block; 41, slot; 42, block; 43, abutment block; 44, abutment slot; 45, spring one; 46, inclined plane one; 47, electromagnet; 5, control block; 51, control slot; 52, moving plate; 53, fixed plate; 54, reset block; 55, reset slot; 56, reset spring; 6, fixing ring; 61, positioning ring; 62, positioning hole; 63, positioning slot; 64, positioning screw. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-5 This application is described in further detail.

[0032] The present application embodiment discloses a pipeline directional drilling and reaming device. Figure 1 and Figure 2 The pipeline directional drilling and reaming device comprises a central axis 1 and a plurality of fixed blocks 11 fixed to the outer periphery of the central axis 1. The plurality of fixed blocks 11 are arranged at equal intervals along the circumference of the central axis 1, and a cutting wheel 12 is installed on the fixed block 11. A wear-resistant disc 13 is sleeved on the outer periphery of the central axis 1, and a moving groove 21 is provided on the side of the fixed block 11. A moving block 22 is slidably installed on the fixed block 11 through the moving groove 21, and a moving rod 2 is rotatably installed on the end face of the moving block 22 close to the cutting wheel 12. A clearance hole 23 is provided on the outer periphery of the moving block 22, and a clearance rod 24 is inserted into the clearance hole 23. A clearance groove 25 is provided in the fixed block 11, and the clearance rod 24 slides and cooperates with the fixed block 11 along the radial direction of the central axis 1 through the clearance groove 25.

[0033] Reference Figure 2 and Figure 3 , a limiting ring 3 is sleeved on the outer periphery of the central shaft 1, and the limiting ring 3 is rotatably connected to the central shaft 1. A plurality of sector-shaped pieces 31 are fixed on the outer periphery of the limiting ring 3, and the sector-shaped pieces 31 correspond to the giving way rods 24 one by one. An arc groove 32 is provided on the side of the sector-shaped piece 31 close to the fixed block 11, and the giving way rod 24 slides and cooperates with the sector-shaped piece 31 through the arc groove 32. One end of the arc groove 32 is arranged close to the limiting ring 3, and the other end of the arc groove 32 is arranged in a direction away from the limiting ring 3. A plurality of limiting grooves 33 are provided on the outer periphery of the central shaft 1, and the plurality of limiting grooves 33 are arranged at equal intervals along the circumference of the central shaft 1. A limiting hole 34 is provided on the outer periphery of the limiting ring 3, and a limiting screw 35 is passed through the limiting hole 34. The limiting screw 35 is threadedly connected to the limiting hole 34, and the limiting screw 35 can be inserted into the limiting groove 33.

[0034] When it is necessary to replace a larger-sized cutting wheel 12, rotate the limit ring 3, and the limit ring 3 drives several fan-shaped pieces 31 to rotate synchronously. The fan-shaped pieces 31 drive the yield rods 24 to move through the arc grooves 32, thereby causing several yield rods 24 to move radially along the central axis 1, so that the moving rod 2 moves in a direction away from the central axis 1, thereby increasing the distance between two adjacent cutting wheels 12.

[0035] Reference Figure 2 and Figure 3 , a connecting block 4 is fixed to the end of the moving rod 2, and a connecting groove 121 for inserting the connecting block 4 is provided on the side of the cutting wheel 12. A plurality of clamping grooves 41 are provided on the outer peripheral surface of the connecting block 4, and a clamping block 42 is installed on the connecting block 4 through the clamping grooves 41 along its own radial sliding, and a clamping groove 122 for inserting the clamping block 42 is provided on the inner wall of the connecting groove 121. An abutment block 43 is fixed to the side of the clamping block 42, and an abutment groove 44 is provided on the inner wall of the clamping groove 41, and the abutment block 43 slides and cooperates with the connecting block 4 along the radial direction of the connecting block 4 through the abutment groove 44. A spring 45 is fixed to the side of the abutment block 43 away from the cutting wheel 12, and one end of the spring 45 away from the abutment block 43 is fixedly connected to the inner wall of the abutment groove 44. A slope 46 is provided on the side of the clamping block 42 close to the cutting wheel 12, and the slope 46 is located on the side of the clamping block 42 away from the fixed block 11.

[0036] The cutting wheel 12 is sleeved on the outer circumference of the connecting block 4, and the connecting block 4 is inserted into the connecting groove 121. The cutting wheel 12 abuts against the inclined surface 46 and pushes the clamping block 42 into the clamping groove 41. After the clamping groove 41 is aligned with the clamping groove 122, the clamping block 42 is inserted into the clamping groove 122 under the elastic force of the spring 45.

[0037] Reference Figure 4 and Figure 5, an electromagnet 47 is fixed to the inner wall of the card slot 41 away from the cutting wheel 12, and the electromagnet 47 can attract the card block 42 after being energized. A control slot 51 is provided on the inner wall of the central shaft 1, and a control block 5 is installed on the central shaft 1 to slide along its own radial direction through the control slot 51. A pressing block 241 is fixed to the outer peripheral surface of one of the yielding rods 24, and the pressing block 241 can abut against the control block 5. A moving piece 52 is fixed to the side of the control block 5 away from the pressing block 241, and a fixed piece 53 is fixed to the inner wall of the control slot 51 away from the pressing block 241, and the fixed piece 53 can be in electrical contact with the moving piece 52. The fixed piece 53 is electrically connected to the power supply, and the moving piece 52 is electrically connected to the electromagnet 47. A reset block 54 is fixed to the side of the control block 5, and a reset slot 55 is provided on the inner wall of the control slot 51, and the reset block 54 slides with the central shaft 1 along the radial direction of the central shaft 1 through the reset slot 55. A return spring 56 is fixed to the side of the return block 54 away from the pressing block 241 , and one end of the return spring 56 away from the return block 54 is fixedly connected to the inner wall of the return groove 55 .

[0038] When the cutting wheel 12 needs to be disassembled, the limit ring 3 is rotated to make the pressure block 241 move toward the direction close to the central axis 1. The pressure block 241 abuts against the control block 5 and pushes the control block 5 to move toward the direction close to the fixed plate 53, so that the movable plate 52 is in electrical contact with the fixed plate 53. The electromagnet 47 is energized and the electromagnet 47 attracts the clamping block 42, and the clamping block 42 disengages from the clamping groove 122, so as to facilitate the disassembly of the cutting wheel 12.

[0039] Reference Figure 1 and Figure 2 The outer periphery of the central shaft 1 is provided with a fixed ring 6, and the fixed ring 6 is rotatably connected to the central shaft 1. A plurality of mounting grooves 14 are provided on the side of the wear-resistant disc 13 close to the fixed ring 6, and a mounting rod 15 is slidably installed on the wear-resistant disc 13 along the length direction of the central shaft 1 through the mounting groove 14. The end face of the mounting rod 15 is fixedly connected to the fixed ring 6, and a mounting spring 16 is fixed to the end face of the mounting rod 15 away from the fixed ring 6, and one end of the mounting spring 16 away from the mounting rod 15 is fixedly connected to the inner wall of the mounting groove 14. The outer periphery of the central shaft 1 is provided with a positioning ring 61, and the positioning ring 61 can abut against the side of the wear-resistant disc 13 away from the fixed ring 6. A positioning hole 62 is provided on the outer periphery of the positioning ring 61, and a plurality of positioning grooves 63 are provided on the outer periphery of the central shaft 1, and the plurality of positioning grooves 63 are arranged at equal intervals along the length direction of the central shaft 1. A positioning screw 64 is passed through the positioning hole 62, and the positioning screw 64 is threadedly connected to the positioning hole 62, and the positioning screw 64 can be inserted into the positioning groove 63.

[0040] The wear-resistant disc 13 abuts against the positioning ring 61 under the elastic force of the mounting spring 16 , so that the wear-resistant disc 13 can be displaced along the length direction of the central axis 1 to a certain extent, so that the wear-resistant disc 13 can crush the stone.

[0041] The implementation principle of a pipeline directional drilling and reaming device in an embodiment of the present application is as follows: the cutting wheel 12 is fixedly connected to the connecting block 4. When a larger-sized cutting wheel 12 needs to be replaced, the limiting ring 3 is rotated, and the limiting ring 3 drives a plurality of fan-shaped pieces 31 to rotate synchronously. The fan-shaped pieces 31 drive the yield rods 24 to move through the arc grooves 32, thereby causing a plurality of yield rods 24 to move radially along the central axis 1, driving the moving rod 2 to move in a direction away from the fixed block 11, so that the distance between two adjacent connecting blocks 4 becomes larger, making it difficult for the replaced large-sized cutting wheel 12 to touch each other, thereby ensuring the construction effect.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipeline directional drilling and reaming device, comprising a central shaft (1) and a plurality of fixed blocks (11) fixed to the outer periphery of the central shaft (1), wherein a cutting wheel (12) is mounted on the fixed block (11), and a wear-resistant disk (13) is sleeved on the outer periphery of the central shaft (1), characterized in that: A movable groove (21) is provided on the side of the fixed block (11), a movable rod (2) is slidably mounted on the fixed block (11) through the movable groove (21), a connecting block (4) is fixed to the end of the movable rod (2), the cutting wheel (12) can be fixedly engaged with the connecting block (4), and a control component for controlling the position of the movable rod (2) is provided on the fixed block (11).

2. A pipeline directional drilling and expanding device according to claim 1, characterized in that: The control component comprises a moving block (22), the moving block (22) being rotatably connected to the end face of the moving rod (2) away from the cutting wheel (12), the outer peripheral surface of the moving block (22) being provided with a clearance hole (23), a clearance rod (24) being inserted into the clearance hole (23), a clearance groove (25) being provided in the fixed block (11), the clearance rod (24) being slidably matched with the fixed block (11) along the radial direction of the central axis (1) through the clearance groove (25), and a pushing component for pushing a plurality of the clearance rods (24) to move synchronously is provided on the central axis (1).

3. A pipeline directional drilling and expanding device according to claim 2, characterized in that: The pushing assembly comprises a limiting ring (3) sleeved on the outer circumference of the central shaft (1), the limiting ring (3) being rotatably connected to the central shaft (1), a plurality of fan-shaped pieces (31) being fixed on the outer circumference of the limiting ring (3), the fan-shaped pieces (31) corresponding one to the giving way rods (24), an arc-shaped groove (32) being provided on the side of the fan-shaped piece (31) close to the fixed block (11), the giving way rod (24) being slidably matched with the fan-shaped piece (31) through the arc-shaped groove (32), one end of the arc-shaped groove (32) being arranged close to the limiting ring (3), and the other end of the arc-shaped groove (32) being arranged in a direction away from the limiting ring (3).

4. A pipeline directional drilling and expanding device according to claim 3, characterized in that: The outer circumference of the limiting ring (3) is provided with a limiting hole (34), the outer circumference of the central axis (1) is provided with a plurality of limiting grooves (33), the plurality of limiting grooves (33) are arranged at equal intervals along the circumference of the central axis (1), a limiting screw (35) is passed through the limiting hole (34), the limiting screw (35) is threadedly connected to the limiting hole (34), and the limiting screw (35) can be inserted into the limiting groove (33).

5. A pipeline directional drilling and expanding device according to claim 4, characterized in that: The side surface of the cutting wheel (12) is provided with a connecting groove (121) for inserting the connecting block (4), the outer peripheral surface of the connecting block (4) is provided with a plurality of clamping grooves (41), the connecting block (4) is slidably mounted with a clamping block (42) along its radial direction through the clamping groove (41), and the inner wall of the connecting groove (121) is provided with a clamping groove (122) for inserting the clamping block (42).

6. A pipeline directional drilling and expanding device according to claim 5, characterized in that: A contact block (43) is fixed on the side of the clamping block (42); a contact groove (44) is provided on the inner wall of the clamping groove (41); the contact block (43) is slidably matched with the connecting block (4) along the radial direction of the connecting block (4) through the contact groove (44); a spring (45) is fixed on the side of the contact block (43) away from the cutting wheel (12); one end of the spring (45) away from the contact block (43) is fixedly connected to the inner wall of the contact groove (44); a slope (46) is provided on the side of the clamping block (42) close to the cutting wheel (12); the slope (46) is located on the side of the clamping block (42) away from the fixed block (11).

7. A pipeline directional drilling and expanding device according to claim 6, characterized in that: An electromagnet (47) is fixed to the inner wall of the clamping groove (41) away from the cutting wheel (12), and the electromagnet (47) can attract the clamping block (42) after being energized. A control groove (51) is opened on the inner wall of the central shaft (1), and a control block (5) is installed on the central shaft (1) through the control groove (51) to slide along its own radial direction. A pressing block (241) is fixed to the outer peripheral surface of one of the yielding rods (24), and the pressing block (241) can abut against the control block (5). A moving plate (52) is fixed to the side of the control block (5) away from the pressing block (241). A fixed plate (53) is fixed to the inner wall of the control groove (51) away from the pressing block (241), and the fixed plate (53) can be in electrical contact with the moving plate (52). The fixed plate (53) is electrically connected to a power source, and the moving plate (52) is electrically connected to the electromagnet (47). A reset block (54) is fixed on the side of the control block (5), a reset groove (55) is provided on the inner wall of the control groove (51), the reset block (54) is slidably engaged with the central axis (1) along the radial direction of the central axis (1) through the reset groove (55), a reset spring (56) is fixed on the side of the reset block (54) away from the pressing block (241), and one end of the reset spring (56) away from the reset block (54) is fixedly connected to the inner wall of the reset groove (55).

8. The pipeline directional drilling and expanding device according to claim 1, characterized in that: The outer periphery of the central shaft (1) is provided with a fixing ring (6), and the fixing ring (6) is rotatably connected to the central shaft (1). The side surface of the wear-resistant disc (13) close to the fixing ring (6) is provided with a plurality of mounting grooves (14). The wear-resistant disc (13) is slidably mounted with a mounting rod (15) along the length direction of the central shaft (1) through the mounting groove (14). The end surface of the mounting rod (15) is fixedly connected to the fixing ring (6). The end surface of the mounting rod (15) away from the fixing ring (6) is fixed with a mounting spring (16). One end of the mounting spring (16) away from the mounting rod (15) is fixedly connected to the inner wall of the mounting groove (14). The outer periphery of the central shaft (1) is provided with a positioning ring (61), and the positioning ring (61) can abut against the side surface of the wear-resistant disc (13) away from the fixing ring (6).

9. A pipeline directional drilling and expanding device according to claim 8, characterized in that: The outer circumference of the positioning ring (61) is provided with a positioning hole (62), and the outer circumference of the central axis (1) is provided with a plurality of positioning grooves (63), and the plurality of positioning grooves (63) are arranged at equal intervals along the length direction of the central axis (1). A positioning screw (64) is passed through the positioning hole (62), and the positioning screw (64) is threadedly connected to the positioning hole (62), and the positioning screw (64) can be inserted into the positioning groove (63).

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