A cutting bit for drilling with a steel pipe

Abstract

This utility model provides a shearing and breaking drill bit for underground steel strip pipes, belonging to the field of pipeline construction technology. It includes a traction head, a pipe-pulling cap connected to the traction head, and a shell. The shell has two symmetrically arranged cutter slots, and a shear assembly is provided inside the shell. The shear assembly also includes a power mechanism fixedly connected inside the shell. The power mechanism is connected to a push plate, and a connecting plate is hinged to the push plate. The connecting plate is hinged to the shear mechanism, which extends from the cutter slots. The shell has at least two hook blades, and the pipe-pulling cap is connected to the shell through a rotating shaft. The shell also has a connecting head. Under the drive of the traction head, the uncut pipe in front of the traction head will deform and become tangled. The power mechanism drives the push plate, which in turn drives the shear mechanism to cut the pipe in front of the traction head, preventing the tangled pipe from blocking the traction head's advance and smoothly completing the removal of old pipes.

Description

Technical Field

[0001] This utility model relates to the field of pipeline construction technology, and specifically to a drill bit for shearing and breaking underground steel strip pipes. Background Technology

[0002] Trenchless replacement technology for underground pipelines is a technical solution to the problem of irreparable damage to underground pipelines. The overall advantage of trenchless replacement methods is that the replacement has little negative impact, occupies less space, and has a very weak impact on the ground, traffic, environment, and surrounding underground pipelines. The replaced pipelines have a good lifespan and quality. Trenchless replacement technology will surely be widely promoted in the field of drainage pipeline replacement.

[0003] Many municipal pipelines use corrugated plastic pipes. When old pipelines are damaged, they need to be repaired. With current technology, trenchless drill bits cannot remove the old pipelines. When drilling old pipelines with existing drill bits, the pipeline is cut and twisted, causing the old pipeline to wrap around the outside of the drill bit, making it impossible for the drill bit to move forward and cut off the old pipeline. Improvements are needed. Utility Model Content

[0004] To address the above problems, this utility model provides a shearing and crushing drill bit for underground steel strip pipes, thereby solving one or more technical problems existing in the prior art, and at least providing a beneficial option or creating conditions.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A shearing and breaking drill bit for underground steel strip pipes includes a traction head connected to a pipe-pulling cap. The traction head includes a housing with two symmetrically arranged cutter slots. A shear assembly is provided inside the housing. The shear assembly further includes a power mechanism fixedly connected inside the housing. The power mechanism is connected to a push plate, which is hinged to a connecting plate. The connecting plate is hinged to a shear mechanism extending from the cutter slots. The housing has at least two hook blades. The pipe-pulling cap is connected to the housing via a pivot. The housing also has a connecting head.

[0007] Preferably, the scissor mechanism includes a first blade holder and a second blade holder, the first blade holder being fixed to the blade groove, the second blade holder being hinged to the connecting plate, and the second blade holder being movably connected to the blade groove.

[0008] Preferably, the tool slot has a movable opening, and the second tool holder has a connecting part, which passes through the movable opening and is hinged to the connecting plate.

[0009] Preferably, the first tool holder includes at least one first blade, and the second tool holder includes at least one or more second blades, which cooperate with the first blades.

[0010] Preferably, the outer shell includes a cylindrical portion and a conical portion, and the hook blade is disposed in the cylindrical portion.

[0011] Preferably, the outer side of the conical part is provided with a plurality of hook blades.

[0012] Preferably, the cylindrical portion and the conical portion are provided with a plurality of hook posts on their outer sides.

[0013] Preferably, the orientation of the hook blade is at an angle to the axial direction of the housing.

[0014] Preferably, the hook knife includes a blade and a reinforcing plate. The bottom of the blade is fixedly connected to the outer shell, the lower part of the reinforcing plate is fixedly connected to the outer shell, and its side is fixedly connected to the blade.

[0015] Preferably, the pipe cap is provided with a transfer mechanism, which is connected to the inner wall of the pipe cap, and the rotating shaft is rotatably connected to the transfer mechanism.

[0016] The beneficial effects of this utility model are:

[0017] This invention, driven by a traction head, causes the uncut pipes in front of the traction head to deform and become tangled. The power mechanism drives the push plate, which in turn drives the scissor mechanism to cut the pipes in front of the traction head, thus preventing the tangled pipes from blocking the traction head's progress and allowing for smooth removal of old pipes.

[0018] The traction head has a conical section to reduce the resistance of the deformed pipe in front, and the hook knife is located in the cylindrical section to facilitate the hook knife cutting the pipe body.

[0019] The first blade holder includes at least one first blade, and the second blade holder includes at least one or more second blades. The second blades work in conjunction with the first blades, and the multiple blades improve the efficiency of cutting the pipe. Attached Figure Description

[0020] Figure 1 This is a perspective view of an embodiment;

[0021] Figure 2 This is a cross-sectional view at point P;

[0022] Figure 3 This is an exploded view of an embodiment;

[0023] Figure 4 This is a magnified view of a portion of point A;

[0024] Figure 5 This is a magnified view of a section at point B;

[0025] Figure 6 This is a schematic diagram of the second tool holder;

[0026] Figure 7 This is a schematic diagram of the first tool holder.

[0027] Explanation of reference numerals in the attached drawings: 1. Traction head; 2. Pipe cap; 3. Outer shell; 31. Connector; 4. Blade groove; 5. Power mechanism; 6. Push plate; 7. Connecting plate; 8. Hook blade; 9. Rotating shaft; 10. First blade holder; 11. Second blade holder; 12. Movable port; 13. Connecting part; 14. First blade; 15. Second blade; 16. Hook column; 17. Blade body; 18. Reinforcing plate; 19. Transfer switch; 20. Slide groove. Detailed Implementation

[0028] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments.

[0029] Example 1: Refer to Figures 1 to 7 This utility model discloses a drill bit for shearing and breaking underground steel strip pipes, comprising a traction head 1, a pipe-pulling cap 2 connected to the traction head 1, a housing 3, and a connecting head 3 3 connected to the pipe-pulling cap 2 via a rotating shaft 9. The housing 3 also has a connecting head 31, preferably an octagonal nut, through which a rotating traction rod (not shown in the figure) is connected. The traction rod is pulled by a drilling rig (not shown in the figure). Driven by the traction rod, the traction head 1 rotates and moves forward. The housing 3 has two symmetrical cutting grooves 4, and a shear assembly is provided inside the housing 3. The shear assembly also includes a power mechanism 5 fixedly connected inside the housing 3. The structure 5 is connected to a push plate 6, the push plate 6 is hinged to a connecting plate 7, and the connecting plate 7 is hinged to a scissor mechanism. The scissor mechanism extends from the cutter slot 4. The outer shell 3 is provided with at least two hooks 8. The hooks 8 cut the pipe. Under the rotation of the traction head 1, the hooks 8 twist the cut pipe together. During the twisting, the uncut pipe in front of the traction head 1 is also twisted together. Usually, pipes with steel strips are tough, so under the drive of the traction head 1, the uncut pipes will also deform and twist together. The power mechanism 5 drives the push plate 6, which in turn drives the scissor mechanism to cut the pipe in front of the traction head 1, so as to prevent the twisted pipes from blocking the forward movement of the traction head 1.

[0030] In the preferred embodiment, the outer shell 3 includes a cylindrical part and a conical part. The hook knife 8 is located in the cylindrical part. The conical part reduces the resistance of the deformed pipe in front. The hook knife 8 is located in the cylindrical part to facilitate cutting the pipe.

[0031] Specifically, several hooks 8 are provided on the outer side of the conical part to increase the probability that the hooks 8 will hook onto the pipe.

[0032] Specifically, several hook posts 16 are provided on the outer sides of the cylindrical and conical parts to increase the probability that the traction head 1 will get caught on the pipe.

[0033] Specifically, the scissor mechanism includes a first blade holder 10 and a second blade holder 11. The first blade holder 10 is fixed to the blade groove 4, and the second blade holder 11 is hinged to the connecting plate 7. The second blade holder 11 is also provided with a sliding groove 20. The blade groove 4 is provided with a slide rail that matches the sliding groove 20. The second blade holder 11 is movably connected to the blade groove 4 through the sliding groove 20 and the slide rail. The power mechanism 5 drives the second blade holder 11 to move back and forth through the connecting plate 7, so as to cooperate with the first blade holder 10 to achieve the purpose of cutting.

[0034] Specifically, the blade slot 4 is provided with a movable opening 12, and the second blade holder 11 is provided with a connecting part 13. The connecting part 13 passes through the movable opening 12 and is hinged to the connecting plate 7. The second blade holder 11 moves back and forth within the range of the movable opening 12 to cooperate with the first blade holder 10 to cut the pipe.

[0035] Specifically, the first blade holder 10 includes at least one first blade 14, and the second blade holder 11 includes at least one or more second blades 15. The second blades 15 cooperate with the first blades 14 to improve the efficiency of cutting the pipe.

[0036] Specifically, the orientation of the hook 8 is at an angle to the axis of the outer casing 3. In a preferred embodiment, the hook 8 is deflected in the direction of rotation of the traction head 1 to improve the efficiency of hooking and cutting the pipe.

[0037] Specifically, the hook knife 8 includes a blade 17 and a reinforcing plate 18. The bottom of the blade 17 is fixedly connected to the outer shell 3, and the lower part of the reinforcing plate 18 is fixedly connected to the outer shell 3, while its side is fixedly connected to the blade 17 to strengthen the hook knife 8 and prevent the blade 17 from deforming during operation.

[0038] Specifically, the pipe cap 2 is equipped with a transfer device 19, which is connected to the inner wall of the pipe cap 2. The rotating shaft 9 is rotatably connected to the transfer device 19. The pipe cap 2 is used to install a new pipe and pull the new pipe forward synchronously, so as to achieve the purpose of cutting the old pipe and installing the new pipe at the same time.

[0039] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A drill bit for shearing and breaking underground steel strip pipes, comprising a traction head (1), wherein the traction head (1) is connected to a pipe-pulling cap (2), characterized in that, The traction head (1) includes a housing (3), which has two symmetrically arranged blade grooves (4). The housing (3) is provided with a scissor assembly. The scissor assembly also includes a power mechanism (5) fixedly connected to the inside of the housing (3). The power mechanism (5) is connected to a push plate (6). The push plate (6) is hinged to a connecting plate (7). The connecting plate (7) is hinged to a scissor mechanism. The scissor mechanism extends out from the blade grooves (4). The housing (3) is provided with at least two hook blades (8). The housing (3) is connected to a pull tube cap (2) through a rotating shaft (9). The housing (3) is also provided with a connector (31).

2. The drill bit for shearing and breaking underground steel strip pipes according to claim 1, characterized in that, The scissor mechanism includes a first blade holder (10) and a second blade holder (11). The first blade holder (10) is fixed to the blade groove (4), and the second blade holder (11) is hinged to the connecting plate (7) and movably connected to the blade groove (4).

3. The drill bit for shearing and breaking underground steel strip pipes according to claim 2, characterized in that, The tool slot (4) is provided with a movable opening (12), and the second tool holder (11) is provided with a connecting part (13). The connecting part (13) passes through the movable opening (12) and is hinged to the connecting plate (7).

4. The drill bit for shearing and breaking underground steel strip pipes according to claim 2, characterized in that, The first tool holder (10) includes at least one first blade (14), and the second tool holder (11) includes at least one or more second blades (15), the second blades (15) cooperating with the first blades (14).

5. The drill bit for shearing and breaking underground steel strip pipes according to claim 1, characterized in that, The outer shell (3) includes a cylindrical part and a conical part, and the hook knife (8) is located in the cylindrical part.

6. The drill bit for shearing and breaking underground steel strip pipes according to claim 5, characterized in that, The outer side of the cone-shaped part is provided with several hooks (8).

7. The drill bit for shearing and breaking underground steel strip pipes according to claim 5, characterized in that, The cylindrical and conical portions are provided with several hook posts (16) on their outer sides.

8. The drill bit for shearing and breaking underground steel strip pipes according to claim 7, characterized in that, The orientation of the hook blade (8) is at an angle to the axial direction of the outer shell (3).

9. The drill bit for shearing and breaking underground steel strip pipes according to claim 8, characterized in that... The hook knife (8) includes a blade (17) and a reinforcing plate (18). The bottom of the blade (17) is fixedly connected to the outer shell (3), and the lower part of the reinforcing plate (18) is fixedly connected to the outer shell (3), and its side is fixedly connected to the blade (17).

10. The drill bit for shearing and breaking underground steel strip pipes according to claim 1, characterized in that, The pipe cap (2) is equipped with a transfer device (19), which is connected to the inner wall of the pipe cap (2), and the rotating shaft (9) is rotatably connected to the transfer device (19).

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