Drill bit mechanism and pipe shed mounting device
By designing the coordinated use of the first drill bit and the second drill bit, the drilling and pipe inserting can be carried out simultaneously, the problem of easy hole collapse of the drill bit can be solved, and the construction efficiency can be improved.
Patent Information
- Application Number
- CN202422846481.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The existing drill bit is prone to cause hole collapse during the drilling process, making it impossible for the pipe roof to enter the hole, which is time-consuming and labor-intensive.
A drill bit mechanism is designed, comprising a first drill bit and a second drill bit sleeved on the outside of the first drill bit. The second drill bit is provided with a mounting portion for fixing the pipe rack steel pipe. The first drill bit and the second drill bit cooperate to drill holes and insert the pipe rack almost simultaneously, thereby avoiding hole collapse.
It effectively avoids the problem of hole collapse, improves work efficiency and saves time.
Smart Images
Figure CN223305671U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of tunnel pipe-roof construction, and in particular to a drill mechanism and a pipe-roof installation device. Background Art
[0002] With the development of society and the economy, there is a need to build more hydropower and water conservancy projects along major rivers in high mountain valleys. In tunnel construction in sections with poor surrounding rock, advanced support is widely used to prevent instability due to the short self-stabilization time after excavation. Among the various advanced support methods, pipe-roof support is widely used due to its relative safety and reliability.
[0003] The pipe roof method is a commonly used auxiliary construction method in tunnel construction. The pipe roof and its pre-grouting not only effectively limit ground subsidence but also ensure a safe and stable working surface and stratum. Patent No. 2018108492159 discloses a multifunctional drilling rig and pipe roof installation device, which primarily comprises a power system, an operating platform, a travel system, an attitude adjustment mechanism, and a drilling system. The power system is located at the rear of the rig, the operating platform is located above the travel system, and the attitude adjustment mechanism provides full rotation angle adjustment for the rig. The pipe roof installation device first uses a drill bit to drill a hole, and then installs the pipe roof pipe. Specifically, the drill rod is connected to the drill bit, and the drive unit drives the drill bit to drill. After drilling is completed, specialized equipment is used to push the pipe roof pipe into the hole. If the rock is loose during drilling, the risk of the hole collapsing is very high. Once the hole collapses, the pipe roof cannot be inserted into the hole, necessitating re-drilling, which is time-consuming and labor-intensive. Utility Model Content
[0004] In view of the deficiencies or problems existing in the prior art, the present disclosure provides a drill bit mechanism and a pipe roof installation device, which can effectively avoid hole collapse when inserting a pipe roof.
[0005] The technical solution adopted by the present disclosure to solve the above-mentioned technical problems is: a drill bit mechanism, including a first drill bit and a second drill bit, the second drill bit is sleeved on the outside of the first drill bit, the first drill bit includes a head and a tail, the tail of the first drill bit is used to connect the drill rod, the head of the first drill bit is used to drill holes, the second drill bit includes a first connecting surface, the first connecting surface is in contact with the outer peripheral wall of the head of the first drill bit, the width of the first connecting surface is smaller than the length of the head of the first drill bit, and the second drill bit is provided with a mounting portion, and the mounting portion is used to be fixedly connected to the pipe-roof steel pipe.
[0006] As a preferred embodiment, the first drill bit is provided with an annular protrusion, with the head and tail of the first drill bit respectively located on either side of the annular protrusion. The second drill bit is provided with a first annular structure, which is located on one side of the annular protrusion. The first connecting surface is the inner circumferential wall of the first annular structure, and the outer diameter of the annular protrusion is larger than the inner diameter of the first annular structure. When the first drill bit is drilling a hole, the second drill bit enters the hole together with the pipe-roof steel pipe. The first annular structure is located on one side of the annular protrusion, and the annular protrusion acts as a limiter for the first annular structure, preventing the second drill bit from being affected by resistance when entering the hole and moving toward the tail of the first drill bit, i.e., out of the hole, thereby preventing the pipe-roof steel pipe from entering the hole as the first drill bit drills.
[0007] In a preferred embodiment, the annular protrusion includes a first end face and a first annular surface. A second end face is provided on a side of the first annular structure proximal to the annular protrusion. The second end face is connected to the second annular surface. The first end face and the second end face are in contact with each other, and a first gap is provided between the first and second annular surfaces. The provision of the first gap prevents the first annular surface from contacting the second drill bit, thereby reducing friction caused by contact between the two and preventing the first drill bit from having difficulty exiting the hole after drilling, or from dragging the second drill bit with it.
[0008] In a preferred embodiment, the annular projection further includes a first inclined surface, one end of the first inclined surface being connected to the tail of the first drill bit and the other end being connected to the first annular surface. The provision of the first inclined surface allows the annular projection to act as a buffer for the tail of the first drill bit, thereby enhancing the structural strength of the tail of the first drill bit and saving a certain amount of material.
[0009] In a preferred embodiment, the head of the first drill bit includes a third annular surface and a second inclined surface. The third annular surface is located between the second inclined surface and the first end surface. A second gap is provided between the third annular surface and the first connecting surface, and the second inclined surface contacts the first connecting surface. The second gap is provided to reduce friction between the first and second drill bits.
[0010] As a preferred embodiment, the width of the third annular surface is smaller than the width of the first connecting surface, and the width of the first connecting surface is smaller than the sum of the widths of the third annular surface and the second inclined surface.
[0011] As a preferred embodiment, the angle between the third annular surface and the first end surface is ninety degrees, and the angle between the second end surface and the first connecting surface is ninety degrees; the angle between the second end surface and the second annular surface is ninety degrees, and the angle between the first end surface and the first annular surface is ninety degrees.
[0012] As a preferred embodiment, the head of the first drill bit also includes a third bevel, the first end of the second bevel is connected to the third annular surface, and the second end of the second bevel is connected to the third bevel, the angle between the third bevel and the second bevel is an obtuse angle or a right angle, and the diameter of the head of the first drill bit gradually increases from the first end to the second end of the second bevel.
[0013] In a preferred embodiment, the head of the first drill bit further includes a third end surface, wherein a first end of the third bevel is connected to the second bevel, and a second end of the third bevel is connected to the third end surface, and the angle between the third bevel and the third end surface is an obtuse angle. The provision of the third bevel gives the head of the first drill bit a wedge-shaped structure, which is more conducive to drilling.
[0014] As a preferred embodiment, the second drill bit is provided with a fourth bevel, which is provided outside the first annular structure. The fourth bevel makes the end of the second drill bit tend to a wedge-shaped structure, thereby facilitating the second drill bit to enter the hole.
[0015] As a preferred embodiment, the second drill bit is further provided with a fourth end face, the fourth end face being connected to the first connecting face, and the angle between the fourth end face and the first connecting face is a right angle. Such an angle setting facilitates the second drill bit to follow the first drill bit into the hole.
[0016] As a preferred embodiment, the mounting portion is provided at an end away from the fourth end face, and the mounting portion includes a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are respectively welded to the pipe roof steel pipe.
[0017] Another object of the present disclosure is to provide a pipe roof installation device, comprising a rock drill and the above-mentioned drill bit mechanism, wherein the rock drill is provided with a machine head connected to a drill rod, one end of the drill rod extending into the interior of a first drill bit.
[0018] Compared with existing products, since the second drill bit is sleeved on the outside of the first drill bit and the width of the first connecting surface is smaller than the length of the head of the first drill bit, after the first drill bit and the second drill bit are connected, the head end of the first drill bit extends outward beyond the second drill bit for a distance, so that the first drill bit can drill a hole; since the second drill bit is provided with a mounting portion, the mounting portion is used to be fixedly connected to the pipe-roof steel pipe. During the drilling process of the first drill bit, the second drill bit and the pipe-roof steel pipe go deeper into the hole together with the first drill bit, which is equivalent to the drilling of the first drill bit and the insertion of the pipe-roof steel pipe being carried out almost simultaneously. After the drilling of the first drill bit is completed, the first drill bit is withdrawn from the hole together with the drill rod, and the second drill bit and the pipe-roof steel pipe remain in the hole to support the rock wall. This can not only effectively avoid the problem of hole collapse, but also save time and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the described objects and may contain exaggerated representations. The drawings are not necessarily drawn to scale.
[0020] Figure 1 This is one of the structural diagrams of a drill bit mechanism disclosed in the present invention;
[0021] Figure 2 This disclosure Figure 1 A partial enlarged view of point A in the middle;
[0022] Figure 3 This is the second structural diagram of a drill bit mechanism disclosed in the present invention;
[0023] Figure 4 It is one of the structural schematic diagrams of the first drill bit disclosed in the present invention;
[0024] Figure 5 This is the second structural schematic diagram of the first drill bit disclosed in the present invention;
[0025] Figure 6 This is a structural diagram of a pipe roof installation device disclosed in the present invention;
[0026] Figure 7 This disclosure Figure 6 A partial enlarged view of point B in the middle.
[0027] Description of reference numerals:
[0028] 1. First drill bit; 11. Head; 111. Third annular surface; 112. Second inclined surface; 113. Third inclined surface; 114. Third end surface; 12. Tail; 13. Annular protrusion; 131. First end surface; 132. First annular surface; 133. First inclined surface; 2. Second drill bit; 21. Mounting portion; 211. First mounting surface; 212. Second mounting surface; 22. First annular structure; 221. First connecting surface; 222. Fourth inclined surface; 223. Fourth end surface; 224. Second end surface; 225. Second annular surface; 3. First gap; 4. Second gap; 5. Rock drill; 6. Drill rod; 7. Pipe-roof steel pipe. DETAILED DESCRIPTION
[0029] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly, and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.
[0030] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.
[0031] Please see Figure 1 、 Figure 2 and Figure 4 As shown, the present application provides a drill bit mechanism, including a first drill bit 1 and a second drill bit 2 made of metal, the second drill bit 2 is sleeved on the outside of the first drill bit 1, the first drill bit 1 includes an integrally formed head 11 and a tail 12, the tail 12 of the first drill bit 1 is used to connect the drill rod 6, the head 11 of the first drill bit 1 is used for drilling, the second drill bit 2 includes a first connecting surface 221, the first connecting surface 221 contacts the outer peripheral wall of the head 11 of the first drill bit 1, the width of the first connecting surface 221 is smaller than the length of the head 11 of the first drill bit 1, the second drill bit 2 is provided with a mounting portion 21, the mounting portion 21 is used to be fixedly connected to the pipe-roof steel pipe 7. Since the second drill bit 2 is sleeved on the outside of the first drill bit 1 and the width of the first connection surface 221 is less than the length of the head 11 of the first drill bit 1, after the first drill bit 1 and the second drill bit 2 are connected, the head 11 end of the first drill bit 1 extends outwardly beyond the second drill bit 2 for a distance, so that the first drill bit 1 can drill a hole. Since the second drill bit 2 is provided with a mounting portion 21, the mounting portion 21 is used to be fixedly connected to the pipe-roof steel pipe 7. During the drilling process of the first drill bit 1, the second drill bit 2 and the pipe-roof steel pipe 7 are penetrated into the hole together with the first drill bit 1, which is equivalent to the drilling of the first drill bit 1 and the insertion of the pipe-roof steel pipe 7 being carried out almost simultaneously. After the first drill bit 1 finishes drilling, the first drill bit 1 is withdrawn from the hole along with the drill rod 6, and the second drill bit 2 and the pipe-roof steel pipe 7 remain in the hole to support the rock wall. This can effectively avoid the problem of collapse and save time and improve work efficiency. If a deeper pipe-roof is required, the next pipe-roof steel pipe 7 can be welded to the rear end of the first pipe-roof steel pipe 7.
[0032] Furthermore, the first drill bit 1 is provided with an annular protrusion 13, with the head 11 and tail 12 of the first drill bit 1 located on either side of the annular protrusion, respectively. The second drill bit 2 is provided with a first annular structure 22, which is located on one side of the annular protrusion 13. The first connecting surface 221 is the inner circumferential wall of the first annular structure 22, and the outer diameter of the annular protrusion 13 is larger than the inner diameter of the first annular structure 22. When the first drill bit 1 is drilling a hole, the second drill bit 2 enters the hole together with the pipe-roof steel pipe 7. The first annular structure 22 is located on one side of the annular protrusion 13, and the annular protrusion acts as a limiter for the first annular structure 22, preventing the second drill bit 2 from moving toward the tail 12 of the first drill bit 1, i.e., out of the hole, due to resistance when entering the hole, thereby preventing the pipe-roof steel pipe 7 from entering the hole as the first drill bit 1 drills the hole.
[0033] For details, please refer to Figure 3 and Figure 5 As shown, the annular protrusion 13 includes a first end surface 131 and a first annular surface 132. A second end surface 224 is provided on the side of the first annular structure 22 adjacent to the annular protrusion 13. The second end surface 224 is connected to a second annular surface 225. The first end surface 131 and the second end surface 224 are in contact with each other, and a first gap 3 is provided between the first annular surface 132 and the second annular surface 225. The provision of the first gap 3 prevents the first annular surface 132 from contacting the second drill bit 2, thereby reducing friction caused by contact between the two and preventing the first drill bit 1 from having difficulty exiting the hole after drilling, or from dragging the second drill bit 2 with it. During the drilling process, the first drill bit 1 carries the second drill bit 2 deeper into the hole. Since the second drill bit 2 is sleeved on the outside of the first drill bit 1, the second drill bit 2 is subjected to greater resistance. Under the action of the resistance, the second drill bit 2 will move out of the hole or have a tendency to move out of the hole. The setting of the annular protrusion 13 makes the first end face 131 fit with the second end face 224 during drilling, and the greater the resistance encountered by the second drill bit 2, the tighter the fit between the first end face 131 and the second end face 224. Since the first drill bit 1 moves straight into the hole during drilling, the second drill bit 2 will also go deeper into the hole against the resistance under the action of the annular protrusion 13.
[0034] It should be noted that the annular protrusion 13 also includes a first bevel 133, one end of which is connected to the tail portion 12 of the first drill bit 1, and the other end is connected to the first annular surface 132. The provision of the first bevel 133 provides a buffering effect between the annular protrusion 13 and the tail portion 12 of the first drill bit 1, thereby enhancing the structural strength of the tail portion 12 of the first drill bit 1 and saving a certain amount of material.
[0035] Please continue to see Figure 2 and Figure 5As shown, in one embodiment of the present disclosure, the head 11 of the first drill bit 1 includes a third annular surface 111 and a second bevel 112, the third annular surface 111 is located between the second bevel 112 and the first end face 131, a second gap 4 is provided between the third annular surface 111 and the first connecting surface 221, and the second bevel 112 is in contact with the first connecting surface 221. The provision of the second gap 4 is used to reduce the friction between the first drill bit 1 and the second drill bit 2. The provision of the second bevel 112 makes the head 11 of the first drill bit 1 located therein roughly flared. Preferably, the width of the third annular surface 111 is smaller than the width of the first connecting surface 221, and the width of the first connecting surface 221 is smaller than the sum of the widths of the third annular surface 111 and the second bevel 112.
[0036] The angle between the third annular surface 111 and the first end surface 131 is 90 degrees, the angle between the second end surface 224 and the first connecting surface 221 is 90 degrees, the angle between the second end surface 224 and the second annular surface 225 is 90 degrees, and the angle between the first end surface 131 and the first annular surface 132 is 90 degrees. This arrangement allows the first end surface 131 and the second end surface 224 to fit tightly together, while the annular protrusion 13 can better limit the position of the second drill bit 2, and the annular protrusion 13 also allows the second drill bit 2 to penetrate the hole more stably and reliably.
[0037] Furthermore, the head 11 of the first drill bit 1 also includes a third bevel 113. The first end of the second bevel 112 is connected to the third annular surface 111, and the second end of the second bevel 112 is connected to the third bevel 113. The angle between the third bevel 113 and the second bevel 112 is an obtuse angle or a right angle. The diameter of the head 11 of the first drill bit 1 gradually increases from the first end to the second end of the second bevel 112. The head 11 of the first drill bit 1 also includes a third end surface 114. The first end of the third bevel 113 is connected to the second bevel 112, and the second end of the third bevel 113 is connected to the third end surface 114. The angle between the third bevel 113 and the third end surface 114 is an obtuse angle. The angle between the third bevel 113 and the third end surface 114 gives the head 11 of the first drill bit 1 a wedge-shaped structure, which is more conducive to drilling. The second bevel 112 is an upwardly inclined surface. This configuration allows the first connecting surface 221 to contact it, increasing the friction between the first drill bit 1 and the second drill bit 2, thereby allowing the first drill bit 1 to drive the second drill bit 2 to rotate and drill the hole together under the action of friction. At the same time, it is necessary to prevent excessive friction between the first drill bit 1 and the second drill bit 2, which would affect the first drill bit 1's exit from the hole. Therefore, the first gap 3 and the second gap 4 are provided to reduce the friction between the first drill bit 1 and the second drill bit 2, and to prevent excessive friction between the two from interfering with the first drill bit 1's exit from the hole after drilling is completed. Because the second bevel 112 is an upwardly inclined surface, in order to facilitate smoother drilling of the head 11 of the first drill bit 1, a downwardly inclined third bevel 113 is required. In this way, the angle between the third bevel 113 and the second bevel 112 is an obtuse angle or a right angle. In addition, to ensure the structural strength of the first drill bit 1 and the size of the drilled hole, a third end surface 114 is required.
[0038] Since the contact area between the first drill bit 1 and the second drill bit 2 is limited, in order to prevent insufficient friction between the first drill bit 1 and the second drill bit 2, which results in the first drill bit 1 being unable to drive the second drill bit 2 to rotate and drill together, a bump or a convex strip is set at the front end of the first connecting surface 221 to increase the friction.
[0039] like Figure 1-Figure 3As shown, the second drill bit 2 is provided with a fourth bevel 222, and the fourth bevel 222 is provided on the outside of the first annular structure 22. The setting of the fourth bevel 222 makes the end of the second drill bit 2 tend to a wedge-shaped structure, thereby facilitating the second drill bit 2 to enter the hole. It should be noted that the second drill bit 2 will rotate along with the first drill bit 1 to drill a hole under the action of friction. The end of the second drill bit 2 tends to a wedge-shaped structure, which, on the one hand, facilitates the second drill bit 2 to enter the hole and, on the other hand, facilitates the second drill bit 2 to drill a hole. The second drill bit 2 is also provided with a fourth end face 223, which is respectively connected to the fourth bevel 222 and the first connecting face 221, and the angle between the fourth end face 223 and the first connecting face 221 is a right angle. Such an angle setting facilitates the second drill bit 2 to enter the hole along with the first drill bit 1. The included angle between the fourth inclined surface 222 and the fourth end surface 223 is an obtuse angle, so that one end of the second drill bit 2 tends to have a wedge-shaped structure, which facilitates the second drill bit 2 to drill when penetrating into the hole.
[0040] The mounting portion 21 is disposed at an end away from the fourth end face 223 and includes a first mounting surface 211 and a second mounting surface 212. The first mounting surface 211 is welded to the end face of the pipe-roof steel pipe 7, and the second mounting surface 212 is welded to the side face of the pipe-roof steel pipe 7. It should be noted that the width of the first mounting surface 211 is greater than or equal to the outer diameter of a single pipe-roof steel pipe 7, so that after the pipe-roof steel pipe 7 is mounted on the mounting portion 21, the lower edge of the pipe-roof steel pipe 7 is not lower than the lower end of the first mounting surface 211. If the lower edge of the pipe-roof steel pipe 7 is lower than the lower end of the first mounting surface 211, the annular protrusion 13 of the first drill bit 1 is likely to strike the pipe-roof steel pipe 7 when exiting the hole, affecting the firmness of the pipe-roof steel pipe 7 in the hole, or the first drill bit 1 may be blocked by the pipe-roof steel pipe 7 and unable to exit the hole.
[0041] Please see Figure 6 and Figure 7 As shown, another embodiment of the present disclosure provides a pipe roof installation device, including a rock drill 5 and the drill bit mechanism in the above embodiment. The rock drill 5 is provided with a machine head, and the machine head is connected to a drill rod 6. The tail 12 of the first drill bit 1 is a hollow structure, and one end of the drill rod 6 extends into the hollow structure.
[0042] The present application has been described in detail above. Specific examples have been used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to facilitate understanding of the present application and its core concepts. It should be noted that, without departing from the principles of the present application, a number of improvements and modifications may be made to the present application by a person skilled in the art, and such improvements and modifications shall fall within the scope of protection of the claims of the present application.
Claims
1. A drill mechanism, characterized in that: The invention comprises a first drill bit (1) and a second drill bit (2), wherein the second drill bit (2) is sleeved on the outside of the first drill bit (1), the first drill bit (1) comprises a head (11) and a tail (12), the tail (12) of the first drill bit (1) is used to connect a drill rod (6), and the head (11) of the first drill bit (1) is used to drill a hole, the second drill bit (2) comprises a first connecting surface (221), the first connecting surface (221) contacts the outer peripheral wall of the head (11) of the first drill bit (1), the width of the first connecting surface (221) is smaller than the length of the head (11) of the first drill bit (1), and the second drill bit (2) is provided with a mounting portion (21), and the mounting portion (21) is used to be fixedly connected to a pipe-roof steel pipe (7).
2. The drill bit mechanism according to claim 1, characterized in that: The first drill bit (1) is provided with an annular protrusion (13), and the head (11) and tail (12) of the first drill bit (1) are respectively located on both sides of the annular protrusion; the second drill bit (2) is provided with a first annular structure (22), and the first annular structure (22) is located on one side of the annular protrusion (13); the first connecting surface (221) is the inner peripheral wall of the first annular structure (22); and the outer diameter of the annular protrusion (13) is greater than the inner diameter of the first annular structure (22).
3. The drill head mechanism according to claim 2, characterized in that: The annular protrusion (13) includes a first end face (131) and a first annular surface (132); a second end face (224) is provided on a side of the first annular structure (22) close to the annular protrusion (13); the second end face (224) is connected to a second annular surface (225); the first end face (131) is fitted with the second end face (224); and a first gap (3) is provided between the first annular surface (132) and the second annular surface (225).
4. The drill head mechanism according to claim 3, characterized in that: The annular protrusion (13) further comprises a first inclined surface (133), one end of the first inclined surface (133) being connected to the tail portion (12) of the first drill bit (1), and the other end being connected to the first annular surface (132).
5. The drill head mechanism according to claim 3, characterized in that: The head (11) of the first drill bit (1) comprises a third annular surface (111) and a second inclined surface (112), wherein the third annular surface (111) is located between the second inclined surface (112) and the first end surface (131), a second gap (4) is provided between the third annular surface (111) and the first connecting surface (221), and the second inclined surface (112) is in contact with the first connecting surface (221).
6. The drill head mechanism according to claim 5, characterized in that: The included angle between the third annular surface (111) and the first end surface (131) is ninety degrees, and the included angle between the second end surface (224) and the first connecting surface (221) is ninety degrees; the included angle between the second end surface (224) and the second annular surface (225) is ninety degrees, and the included angle between the first end surface (131) and the first annular surface (132) is ninety degrees.
7. The drill head mechanism according to claim 5, characterized in that: The head (11) of the first drill bit (1) further comprises a third bevel (113), a first end of the second bevel (112) is connected to the third annular surface (111), and a second end of the second bevel (112) is connected to the third bevel (113), an angle between the third bevel (113) and the second bevel (112) is an obtuse angle or a right angle, and a diameter of the head (11) of the first drill bit (1) gradually increases from the first end of the second bevel (112) to the second end.
8. The drill head mechanism according to claim 7, characterized in that: The head (11) of the first drill bit (1) further comprises a third end surface (114), a first end of the third inclined surface (113) is connected to the second inclined surface (112), a second end of the third inclined surface (113) is connected to the third end surface (114), and an angle between the third inclined surface (113) and the third end surface (114) is an obtuse angle.
9. The drill head mechanism according to claim 2, characterized in that: The second drill bit (2) is provided with a fourth inclined surface (222), and the fourth inclined surface (222) is provided on the outside of the first annular structure (22).
10. The drill head mechanism according to claim 2, characterized in that: The second drill bit (2) is further provided with a fourth end surface (223), the fourth end surface (223) is connected to the first connecting surface (221), and the angle between the fourth end surface (223) and the first connecting surface (221) is a right angle.
11. The drill head mechanism according to claim 10, characterized in that: The mounting portion (21) is arranged at an end away from the fourth end surface (223), and the mounting portion (21) includes a first mounting surface (211) and a second mounting surface (212), and the first mounting surface (211) and the second mounting surface (212) are respectively welded to the pipe-roof steel pipe (7).
12. A pipe roof installation device, characterized in that: The invention comprises a rock drill (5) and a drill bit mechanism according to any one of claims 1 to 11, wherein the rock drill (5) is provided with a machine head, the machine head is connected to a drill rod (6), and one end of the drill rod (6) extends into the interior of a first drill bit (1).