A multi-functional pipe jacking machine

Abstract

The application discloses a multifunctional pipe tunneling machine, which comprises a main body, a cutter head and a pushing mechanism for pushing the main body to move forward, the main body is in a cylindrical shape, a moving seat is arranged in the main body, a rotating shaft is rotatably arranged on the moving seat, a moving driving mechanism is arranged between the moving seat and the main body, a rotating driving mechanism for driving the rotating shaft to rotate is further arranged on the moving seat, a conveying belt is arranged in the main body, the cutter head comprises an annular shell, a central shaft is sleeved in the annular shell, a universal coupling is arranged between the central shaft and the rotating shaft, a cutter head angle adjusting mechanism is arranged between the main body and the cutter head, a scraper is arranged between the central shaft and the annular shell, and a tunneling device is arranged on the scraper, the cutter head angle adjusting mechanism and the universal coupling can be used for adjusting the angle of the cutter head in any direction, so that the tunneling direction can be changed, and the direction adjustment during tunneling is facilitated.

Description

Technical Field

[0001] This invention relates to a multi-functional pipeline tunneling machine. Background Technology

[0002] Currently, the pipe jacking technology used has long construction time, high project costs, and cannot guarantee worker safety. It cannot complete construction in a time-saving, efficient, and safe manner. The manual excavation and pipe jacking technology used in the present technology will cause imbalance in the vertical and horizontal aspects of the pipeline, misalignment and non-intersection at the ends of the pipes, and excessive gaps between the pipeline and the ground, which often lead to collapses and water leakage from the outer wall of the pipeline. Over time, the ground will collapse, posing dangers to vehicles and personnel. There is also the danger of personnel being injured by collapses during excavation. The short pipe jacking distance results in too many excavator pits and inspection wells, wasting manpower and resources. Moreover, due to the many unsafe factors underground, the safety of personnel cannot be guaranteed. In addition, the existing conveying mechanism cannot simultaneously transport materials during excavation, affecting the efficiency of pipeline laying. Although automated pipeline tunneling equipment has emerged in the present technology, the existing equipment has limited functions, cannot effectively adjust the excavation angle, and cannot effectively cope with complex geological environments. Summary of the Invention

[0003] To overcome the above deficiencies, this invention provides a multi-functional pipeline tunneling machine that can easily adjust the tunneling angle, effectively adapt to the geological environment, and improve pipeline laying efficiency.

[0004] The technical solution of the present invention is: a multi-functional pipeline tunneling machine, comprising a main body, a cutterhead, and a pushing mechanism for moving the main body forward. The main body is cylindrical, and a movable seat is provided inside the main body. A rotating shaft is rotatably mounted on the movable seat. A moving drive mechanism is provided between the movable seat and the main body. A rotating drive mechanism for driving the rotating shaft to rotate is also installed on the movable seat. A conveyor belt is installed inside the main body. The cutterhead includes an annular housing, and a central shaft is sleeved inside the annular housing. A universal coupling is provided between the central shaft and the rotating shaft. A cutterhead angle adjustment mechanism is provided between the main body and the cutterhead. A scraper is installed between the central shaft and the annular housing, and a tunneling device is installed on the scraper. The front end of the conveyor belt extends out of the main body and is located inside the scraper.

[0005] As a preferred technical solution, the cutter head angle adjustment mechanism includes a planar bearing fixedly mounted on the annular housing, the planar bearing being sleeved outside the central shaft, and at least three hydraulic cylinders mounted on the main body, with the piston rods of the hydraulic cylinders pressing against the outer race of the planar bearing.

[0006] As a preferred technical solution, a scraper angle adjustment mechanism is provided between the scraper and the central shaft. The outer end of the scraper is hinged to the annular housing. The scraper angle adjustment mechanism includes a rotational connection mechanism provided between the inner end of the scraper and the central shaft. The scraper angle adjustment mechanism also includes a movable sleeve sleeved on the central shaft. The movable sleeve and the annular housing are fixedly installed together. A locking mechanism is provided between the movable sleeve and the central shaft.

[0007] As a preferred technical solution, the scraper is provided with multiple mounting grooves, and a rotating shaft extending along the length direction of the scraper is rotatably mounted in the mounting grooves. The tunneling device includes a tunneling wheel rotatably mounted on the rotating shaft. The tunneling wheel includes a wheel body, and the axis of the wheel body is provided with a mounting hole for the rotating shaft to pass through. Multiple swing teeth are provided on the end face of the tunneling wheel. The middle part of the swing teeth is hinged to the wheel body. One end of the swing teeth is provided with a crushing part, and the other end of the swing teeth is provided with a shoveling part. A driving bevel gear is fixedly mounted on the annular housing. A driven bevel gear that meshes with the driving bevel gear is fixedly mounted on the rotating shaft. Multiple protrusions that respectively cooperate with the swing teeth are fixedly mounted on the rotating shaft. The cutterhead has a crushing function. In the crushing mode and the tunneling mode, the central shaft moves backward relative to the annular housing, causing the inner end of the scraper to deflect inward toward the annular housing. During this deflection, the rotating shaft rotates clockwise, and the protrusion lifts the crushing portion of the oscillating tooth. The shoveling portion of the oscillating tooth is located inside the wheel body. In the tunneling mode, the central shaft moves forward relative to the annular housing, causing the inner end of the scraper to deflect outward toward the annular housing. During this deflection, the rotating shaft rotates counterclockwise, and the protrusion lifts the shoveling portion of the oscillating tooth. The crushing portion of the oscillating tooth is located inside the wheel body.

[0008] As a preferred technical solution, the rotating connection mechanism includes a hinge seat fixedly installed at the front end of the central shaft, an elastic telescopic rod hinged between the hinge seat and the inner surface of the scraper, the elastic telescopic rod including an outer cylinder hinged to the hinge seat, an inner column movably installed inside the outer cylinder, the inner column hinged to the inner surface of the scraper, and a tension spring connected between the inner wall of the outer cylinder and the inner column inside the outer cylinder.

[0009] As a preferred technical solution, an inner end limiting mechanism for the scraper is provided between the inner end of the scraper and the central shaft. The inner end limiting mechanism for the scraper includes a plurality of limiting grooves opened on the front end face of the central shaft. The inner end of the scraper is provided with a locking part that is locked in the limiting groove during the crushing mode.

[0010] As a preferred technical solution, a crushing protrusion is fixedly installed on the outer surface of the snap-fit ​​part, and a crushing blade is provided on the front end face of the central shaft. In the crushing mode, the snap-fit ​​part is snapped into the limiting groove and the crushing blade and the crushing protrusion coincide with each other in the circumferential direction of the central shaft, and at this time the height of the crushing protrusion is higher than the height of the crushing blade; in the tunneling mode, the crushing blade and the crushing protrusion are offset in the circumferential direction of the central shaft.

[0011] As a preferred technical solution, the locking mechanism includes a positioning hole on the outer circumferential surface of the central shaft, a moving ring sleeved on the moving sleeve, a guide hole extending radially along the moving sleeve, a positioning pin movably installed in the guide hole that mates with the positioning hole, a guide wheel rotatably mounted on the outer end of the positioning pin, a wedge block on the moving ring that pushes the positioning pin upward when moving towards the front end of the central shaft, a moving ring pushing hydraulic cylinder fixedly installed on the main body that pushes the moving ring, the piston rod of the moving ring pushing hydraulic cylinder pressing against the moving ring, a reset mechanism between the moving ring and the moving sleeve, and a spring between the positioning pin and the moving sleeve that causes the positioning pin to move towards the center of the central shaft.

[0012] As a preferred technical solution, the front end face of the central shaft is further provided with guide grooves corresponding to each of the limiting grooves. The limiting grooves and the corresponding guide grooves are interconnected. The guide grooves and the limiting grooves extend along the diameter direction of the central shaft. A slider is movably installed in the guide groove. A tunneling tooth is installed on the slider. The tunneling tooth includes a right-angled side and a hypotenuse. The front end of the right-angled side and the front end of the hypotenuse intersect. The right-angled sides of each tunneling tooth are adjacent. A guide roller is rotatably installed on the hypotenuse of the tunneling tooth. The inner end of the scraper is provided with an inclined surface that cooperates with the roller.

[0013] By adopting the above technical solution, a multi-functional pipeline tunneling machine includes a main body, a cutterhead, and a pushing mechanism for moving the main body forward. The main body is cylindrical, and a movable seat is provided inside the main body. A rotating shaft is rotatably mounted on the movable seat. A moving drive mechanism is provided between the movable seat and the main body. A rotating drive mechanism for driving the rotating shaft to rotate is also installed on the movable seat. A conveyor belt is installed inside the main body. The cutterhead includes an annular shell, and a central shaft is fitted inside the annular shell. A universal coupling is provided between the central shaft and the rotating shaft. A cutterhead angle adjustment mechanism is provided between the main body and the cutterhead. A scraper is installed between the central shaft and the annular shell, and a tunneling device is installed on the scraper. The front end of the conveyor belt extends out of the main body and is located inside the scraper. By setting the cutterhead angle adjustment mechanism and the universal coupling, the angle of the cutterhead can be adjusted in any direction, thereby changing the tunneling direction and facilitating direction adjustment during tunneling. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the cutter head in crushing mode in an embodiment of the present invention;

[0017] Figure 3 yes Figure 1 A magnified view of a section at point I;

[0018] Figure 4 yes Figure 1 Enlarged view of section II in the middle;

[0019] Figure 5 This is a schematic diagram showing the position of the oscillating teeth when in crushing mode;

[0020] Figure 6 This is a schematic diagram showing the position of the oscillating teeth when in tunneling mode;

[0021] Figure 7 This is a schematic diagram of the snap-fit ​​part snapping into the limiting groove in an embodiment of the present invention;

[0022] Figure 8 yes Figure 7 A magnified view of a section at point III;

[0023] Figure 9 This is a schematic diagram showing the separation of the tunneling teeth in an embodiment of the present invention;

[0024] Figure 10 This is a schematic diagram of the tunneling teeth converging together in an embodiment of the present invention. Detailed Implementation

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a multi-functional tunnel boring machine includes a main body 1, a cutterhead 2, and a pushing mechanism for moving the main body forward. The pushing mechanism includes a pushing hydraulic cylinder located behind the main body. The piston rod of the pushing hydraulic cylinder pushes the main body forward. The main body 1 is cylindrical, and a movable seat 3 is provided inside the main body 1. A rotating shaft 4 is rotatably mounted on the movable seat 3. The movable seat is movably mounted on a guide rail 46. A moving drive mechanism is provided between the movable seat 3 and the main body 1. The moving drive mechanism includes a moving drive hydraulic cylinder 33 fixedly installed inside the main body. The piston rod of the moving drive hydraulic cylinder 33 is hinged to the movable seat 3. The main body 1 is also equipped with a rotation drive mechanism to drive the rotating shaft 4. The rotation drive mechanism includes a motor fixedly mounted on the movable base. A transmission gear is provided between the output shaft of the motor and the rotating shaft. A conveyor belt 5 is installed inside the main body 1. The cutterhead 2 includes an annular housing 6. A central shaft 7 is fitted inside the annular housing 6. A universal coupling 8 is provided between the central shaft 7 and the rotating shaft 4. A cutterhead angle adjustment mechanism is provided between the main body 1 and the cutterhead 2. A scraper 9 is installed between the central shaft 7 and the annular housing 6. A tunneling device is installed on the scraper 9. The front end of the conveyor belt 5 extends out of the main body 1 and is located inside the scraper 9. Through the setting of the cutterhead angle adjustment mechanism and the universal coupling 8, the angle of the cutterhead can be adjusted in any direction, thereby changing the tunneling direction and facilitating direction adjustment during tunneling. The inner wall of the annular shell 6 is provided with a partition 43, which divides the inner wall of the annular shell 6 into multiple grooves 44. Excavated soil blocks enter the grooves 44. As the annular shell 6 rotates, when the grooves 44 move above the conveyor belt 5, the soil blocks are poured from the grooves 44 into the conveyor belt 5 and transported backward by the conveyor belt 5, thereby realizing continuous excavation in the soil layer. A rear retaining ring 45 is fixedly installed on the rear end face of the annular shell 6.

[0026] like Figure 3 and Figure 4As shown, the cutter head angle adjustment mechanism includes a planar bearing 10 fixedly mounted on the annular housing 6. The planar bearing 10 is sleeved outside the central shaft 7. At least three hydraulic cylinders 11 are mounted on the main body 1, and the piston rods of the hydraulic cylinders 11 abut against the outer race of the planar bearing 10. The outer race of the planar bearing refers to the race adjacent to the side of the planar bearing 10 on the main body 1. By changing the length of the piston rods of the three hydraulic cylinders 11, the direction and angle of the abutting planar bearing 10 can be changed, thereby changing the angle of the cutter head 2.

[0027] like Figure 1 and Figure 3 As shown, a scraper angle adjustment mechanism is provided between the scraper 9 and the central shaft 7. The outer end of the scraper 9 is hinged to the annular housing 6. The scraper angle adjustment mechanism includes a rotating connection mechanism provided between the inner end of the scraper 9 and the central shaft 7. The scraper angle adjustment mechanism also includes a movable sleeve 12 sleeved on the central shaft 7. The movable sleeve 12 and the annular housing 6 are fixedly installed together. A locking mechanism is provided between the movable sleeve 12 and the central shaft. The hydraulic cylinder 11 of the cutterhead angle adjustment mechanism presses the cutterhead 2 against the main body 1, thereby maintaining the angle between the cutterhead 2 and the main body 1. The locking mechanism is released, and the position of the central shaft 7 is changed by the moving drive mechanism. Since the outer end of the scraper 9 is hinged to the annular housing 6, and the scraper angle adjustment mechanism includes a rotating connection mechanism between the inner end of the scraper 9 and the central shaft 7, when the position of the central shaft 7 changes, the cutterhead 2 cannot be changed because the hydraulic cylinder 11 of the cutterhead angle adjustment mechanism presses the cutterhead 2 against the main body 1. Therefore, the angle of the scraper 9 can be adjusted, thereby realizing the switching of the cutterhead 2 between the crushing mode and the tunneling mode.

[0028] like Figure 1 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the scraper 9 is provided with multiple mounting grooves 13, and a rotating shaft 14 extending along the length direction of the scraper is rotatably mounted in the mounting grooves 13. The tunneling device includes a tunneling wheel rotatably mounted on the rotating shaft 14. The tunneling wheel includes a wheel body 15, and the axis of the wheel body 15 is provided with a mounting hole 16 for the rotating shaft 14 to pass through. Multiple swing teeth 17 are provided on the end face of the tunneling wheel. The middle part of the swing teeth 17 is hinged to the wheel body 15, and one end of the swing teeth 17 is provided with a crushing part 18. The other end of the swing tooth 17 is provided with a shovel part 19. A driving bevel gear 20 is fixedly installed on the annular housing 6. A driven bevel gear 21 that meshes with the driving bevel gear 20 is fixedly installed on the rotating shaft 14. A plurality of protrusions 22 that respectively cooperate with the swing tooth 17 are fixedly installed on the rotating shaft 14. In this embodiment, three swing teeth 17 are provided on one wheel body 15, and three protrusions 22 are fixedly installed on the wheel body. The cutter head has a crushing mode and a tunneling mode. In the crushing mode, such as Figure 2 , Figure 4 and Figure 5 As shown, the central shaft 7 moves backward relative to the annular housing 6, causing the inner end of the scraper 9 to deflect inward toward the annular housing 6. During this deflection, the rotating shaft 14 rotates clockwise due to the arrangement of the driving bevel gear 20 and the driven bevel gear 21. The protrusion 22 lifts the crushing part 18 of the swing tooth 17, causing the crushing part to protrude from the wheel body. The shoveling part 19 of the swing tooth 17 is located inside the wheel body 15. In the tunneling mode, such as Figure 1 , Figure 3 and Figure 6 As shown, the central shaft 7 moves forward relative to the annular housing 6, causing the inner end of the scraper 9 to deflect outward from the annular housing 6. During this deflection, the rotating shaft 14 rotates counterclockwise due to the arrangement of the driving bevel gear 20 and the driven bevel gear 21. The protrusion 22 lifts the shoveling part 19 of the swing tooth 17, causing the shoveling part to protrude from the wheel body. The crushing part 18 of the swing tooth 17 is located inside the wheel body 15. Thus, in crushing mode, the crushing part can be lifted and act on the soil first, while in tunneling mode, the shoveling part can be lifted and act on the soil. It should be noted that... Figure 5 and Figure 6 The direction of the middle arrow indicates the direction of rotation of the annular shell, where... Figure 5 The corresponding annular shell 6 rotates counterclockwise. In this embodiment, the crushing efficiency is highest when the annular shell is in crushing mode and rotating counterclockwise. Figure 6The corresponding annular shell 6 rotates clockwise. In this embodiment, the tunneling efficiency is highest when the annular shell rotates clockwise and is in tunneling mode. When encountering a relatively hard soil layer, a crushing mode is used; when the soil layer is relatively soft, a tunneling mode is used. In the crushing mode, when the annular shell 6 rotates clockwise, the protrusion 22 lifts the crushing part 18 of the swing tooth 17. The shoveling part 19 of the swing tooth is located inside the wheel body 1. When the annular shell 6 rotates clockwise, the swing tooth 17 will not interact with the soil layer, thereby preventing the shoveling part 19 from colliding with hard objects and being damaged. Figure 3 and Figure 4 As shown, the rotating connection mechanism includes a hinge seat 23 fixedly mounted at the front end of the central shaft 7. An elastic telescopic rod is hinged between the hinge seat 23 and the inner surface of the scraper 9. The elastic telescopic rod includes an outer cylinder 25 hinged to the hinge seat. An inner column 26 is movably installed inside the outer cylinder and is hinged to the inner surface of the scraper. A tension spring is provided inside the outer cylinder connecting the inner wall of the outer cylinder and the inner column. The outer end of the scraper 9 is hinged to the annular housing 6. The outer end of the scraper 9 cannot move but can only rotate relative to the hinge axis. Since the rotating connection mechanism includes the elastic telescopic rod, when switching to the crushing mode, when the central shaft moves backward, the inner end of the scraper 9 will deflect and move relative to the central shaft 7 toward the axis of the central shaft. The front surface of the hinge seat 23 is a limiting surface. In the tunneling mode, the limiting surface of the hinge seat 23 is pressed against the scraper 9.

[0029] like Figure 7 and Figure 8 As shown, in order to ensure the strength of the inner end of the scraper in the crushing mode, an inner end limiting mechanism is provided between the inner end of the scraper 9 and the central shaft 7. The inner end limiting mechanism includes multiple limiting grooves 27 opened on the front end face of the central shaft; the inner end of the scraper 9 is provided with a snap-fit ​​part 28 that is stuck in the limiting groove 27 when in the crushing mode.

[0030] like Figure 9 and Figure 10 As shown, a crushing protrusion 29 is fixedly installed on the outer surface of the snap-fit ​​part 28.

[0031] like Figure 3 and Figure 4As shown, the locking mechanism includes a positioning hole 31 on the outer circumferential surface of the central shaft. A moving ring 32 is fitted over the moving sleeve 12. A guide hole extending radially along the moving sleeve 12 is also provided on the moving sleeve 12. A positioning pin 34 that mates with the positioning hole 31 is movably installed in the guide hole. A guide wheel 35 is rotatably installed on the outer end of the positioning pin. A wedge block 30 is provided on the moving ring 32 to push the positioning pin 34 upward when it moves toward the front end of the central shaft 7. A moving ring pushing hydraulic cylinder 36 that pushes the moving ring 32 is fixedly installed on the main body 1. The piston rod of the moving ring pushing hydraulic cylinder 36 presses against the moving ring 32. A reset mechanism is provided between the moving ring 32 and the moving sleeve 12. The reset mechanism includes a reset spring provided between the moving ring and the moving sleeve. A spring is provided between the positioning pin 34 and the moving sleeve 12 to make the positioning pin move toward the center of the central shaft. The moving ring drives the hydraulic cylinder 36 to move the moving ring 32. When the wedge block acts on the guide wheel, since the height of the rear end of the wedge block is higher than the height of the front end of the wedge block 30, the positioning pin 34 will be pushed upward, thereby unlocking the central shaft 7 and the moving sleeve 12. When the moving ring 32 moves backward, the positioning pin 34 is inserted into the positioning hole 31 under the action of the spring, thereby locking the central shaft 7 and the moving sleeve 12. The central shaft has two sets of positioning holes 31, front and rear, so that locking can be achieved in both the crushing mode and the tunneling mode.

[0032] like Figure 9 and Figure 10 As shown, the front end face of the central shaft 7 is also provided with guide grooves 38 corresponding to each of the limiting grooves 27. The limiting grooves 27 and the corresponding guide grooves 38 are interconnected. The guide grooves 38 and the limiting grooves 27 extend along the diameter direction of the central shaft. A slider 39 is movably installed in the guide groove. A digging tooth 40 is installed on the slider. The digging tooth includes a right-angled side 41 and a hypotenuse 42. The front end of the right-angled side and the front end of the hypotenuse intersect. The right-angled sides 41 of each digging tooth 40 are adjacent. A guide roller 37 is rotatably installed on the hypotenuse of the digging tooth 40. The inner end of the scraper is provided with an inclined surface 42 that cooperates with the roller 41. When switching to the crushing mode, as the scraper 9 moves backward with the central shaft 7, the front end of the scraper 9 deflects and pushes the sliders 39 closer together through the inclined surface 42. Figure 10 As shown, this causes the digging teeth 40 on each of the sliders 39 to come together, enabling more efficient operation.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-functional pipeline tunneling machine, characterized in that, The device includes a main body, a cutter head, and a pushing mechanism for moving the main body forward. The main body is cylindrical and has a movable seat inside. A rotating shaft is rotatably mounted on the movable seat. A moving drive mechanism is provided between the movable seat and the main body. A rotating drive mechanism for driving the rotating shaft to rotate is also installed on the movable seat. A conveyor belt is installed inside the main body. The cutter head includes an annular housing. A central shaft is fitted inside the annular housing. A universal coupling is provided between the central shaft and the rotating shaft. A cutter head angle adjustment mechanism is provided between the main body and the cutter head. A scraper is installed between the central shaft and the annular housing. A tunneling device is installed on the scraper. The front end of the conveyor belt extends out of the main body and is located inside the scraper. The cutter head angle adjustment mechanism includes a planar bearing fixedly mounted on the annular housing, the planar bearing being sleeved outside the central shaft, and at least three hydraulic cylinders mounted on the main body, with the piston rods of the hydraulic cylinders pressing against the outer race of the planar bearing; A scraper angle adjustment mechanism is provided between the scraper and the central shaft. The outer end of the scraper is hinged to the annular housing. The scraper angle adjustment mechanism includes a rotational connection mechanism provided between the inner end of the scraper and the central shaft. The scraper angle adjustment mechanism also includes a movable sleeve sleeved on the central shaft. The movable sleeve and the annular housing are fixedly installed together. A locking mechanism is provided between the movable sleeve and the central shaft. The scraper has multiple mounting slots, and a rotating shaft extending along the length of the scraper is rotatably mounted in each slot. The tunneling device includes a tunneling wheel rotatably mounted on the rotating shaft. The tunneling wheel includes a wheel body, and the axis of the wheel body has a mounting hole for the rotating shaft to pass through. Multiple swing teeth are provided on the end face of the tunneling wheel, and the middle of each swing tooth is hinged to the wheel body. One end of each swing tooth has a crushing part, and the other end has a shoveling part. A driving bevel gear is fixedly mounted on the annular housing. A driven bevel gear that meshes with the driving bevel gear is fixedly mounted on the rotating shaft. Multiple protrusions that respectively cooperate with the swing teeth are fixedly mounted on the rotating shaft. The cutterhead has a crushing mode and a tunneling mode. In the crushing mode, the central shaft moves backward relative to the annular housing, causing the inner end of the scraper to deflect inward toward the inside of the annular housing. During this deflection, the rotating shaft rotates clockwise, and the protrusion lifts the crushing portion of the oscillating tooth. The shoveling portion of the oscillating tooth is located inside the wheel body. In the tunneling mode, the central shaft moves forward relative to the annular housing, causing the inner end of the scraper to deflect outward toward the outside of the annular housing. During this deflection, the rotating shaft rotates counterclockwise, and the protrusion lifts the shoveling portion of the oscillating tooth. The crushing portion of the oscillating tooth is located inside the wheel body.

2. The multi-functional pipeline tunneling machine as described in claim 1, characterized in that, The rotating connection mechanism includes a hinge seat fixedly mounted at the front end of the central shaft, an elastic telescopic rod hinged between the hinge seat and the inner surface of the scraper, the elastic telescopic rod including an outer cylinder hinged to the hinge seat, an inner column movably mounted inside the outer cylinder, the inner column hinged to the inner surface of the scraper, and a tension spring connected between the inner wall of the outer cylinder and the inner column inside the outer cylinder.

3. The multi-functional pipeline tunneling machine as described in claim 2, characterized in that, An inner end limiting mechanism is provided between the inner end of the scraper and the central shaft. The inner end limiting mechanism includes multiple limiting grooves opened on the front end face of the central shaft. The inner end of the scraper is provided with a locking part that is locked in the limiting groove during the crushing mode.

4. The multi-functional pipeline tunneling machine as described in claim 3, characterized in that, Crushing protrusions are fixedly installed on the outer surface of the snap-fit ​​part.

5. The multi-functional pipeline tunneling machine as described in claim 1, characterized in that, The locking mechanism includes a positioning hole on the outer circumferential surface of the central shaft, a moving ring sleeved on the moving sleeve, a guide hole extending radially along the moving sleeve, a positioning pin movably installed in the guide hole that mates with the positioning hole, a guide wheel rotatably mounted on the outer end of the positioning pin, a wedge block on the moving ring that pushes the positioning pin upward when moving towards the front end of the central shaft, a moving ring pushing hydraulic cylinder fixedly installed on the main body that pushes the moving ring, the piston rod of the moving ring pushing hydraulic cylinder pressing against the moving ring, a reset mechanism between the moving ring and the moving sleeve, and a spring between the positioning pin and the moving sleeve that causes the positioning pin to move towards the center of the central shaft.

6. The multi-functional pipeline tunneling machine as described in claim 3, characterized in that, The front end face of the central shaft is also provided with guide grooves corresponding to each of the limiting grooves. The limiting grooves and the corresponding guide grooves are interconnected. The guide grooves and the limiting grooves extend along the diameter direction of the central shaft. A slider is movably installed in the guide groove. A tunneling tooth is installed on the slider. The tunneling tooth includes a right-angled side and a hypotenuse. The front end of the right-angled side and the front end of the hypotenuse intersect. The right-angled sides of each tunneling tooth are adjacent. A guide roller is rotatably installed on the hypotenuse of the tunneling tooth. The inner end of the scraper is provided with an inclined surface that cooperates with the roller.

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