A device for preventing anchor drill bit from being entangled in a net

Abstract

The present invention discloses a device for preventing an anchor drill bit from being entangled in a net, and belongs to the technical field of tunnel support. The device of the present invention comprises a net pushing component and a drill follower component, wherein the protective tube of the net pushing component is fixed on the anchor frame; the bottom ends of multiple net pushing angle cones are hinged on the top of the protective tube, and each net pushing angle cone is provided with a strong magnetic part; the drill follower component comprises a rotating bearing, which is mounted on the anchor drill bit, and the anchor drill bit is connected to the anchor working arm; the rubber cushion layer is located between the inner ring of the rotating bearing and the anchor drill bit, and is fixed to the inner ring of the rotating bearing; the follower magnetic ring is fixedly connected to the outer ring of the rotating bearing through a support member, and the tops of the multiple net pushing angle cones of the present invention can gather together, and cooperate with the follower magnetic ring to realize automatic opening before the end of the anchor drill bit contacts the rock surface, and the net material is blocked outside the multiple net pushing angle cones, so that the anchor drill bit can smoothly pass through the top openings of the opened multiple net pushing angle cones to contact the rock surface to perform drilling operations.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support, and in particular to a device for preventing an anchor drill bit from being entangled in a mesh. Background Art

[0002] At present, the tunnel support system is mainly based on the anchor net system. The manual construction process is to drill holes to arrange anchor rods, then install mesh materials, and finally spray concrete. However, due to the complex geological conditions in the tunnel, frequent disasters, and high risks of manual construction, the mechanized construction process of the anchor net system is now being introduced. Affected by mechanical equipment, the construction process of the anchor net system has changed to laying mesh materials first, then drilling holes and installing anchor rods, and finally spraying concrete. Mechanized construction reduces risks and improves construction efficiency, but it also faces some problems. Due to the long length of the anchor rod operating arm, it will shake when drilling, making it difficult to control the position of the drill bit. Often, when the drilling operation starts, the mesh wire next to the drill bit will be entangled, causing the mesh material to be damaged.

[0003] In summary, there is currently no device that can effectively avoid the entanglement phenomenon. Therefore, the present invention proposes a device to prevent the anchor drill bit from being entangled in the net. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and to provide a device for preventing an anchor drill bit from being entangled in a mesh. The device can push away the mesh material that may be affected during drill construction to avoid entanglement, thereby ensuring that the mesh material is not damaged during construction, and the mesh pushing component can be opened and closed as the anchor drill bit moves.

[0005] The present invention discloses a device for preventing an anchor drill bit from being entangled in a net, which is mounted on an anchor frame, and the anchor frame is arranged at one end of an anchor working arm close to a rock surface, and comprises a protective tube fixed on the anchor frame;

[0006] A plurality of mesh pushing angle pyramids, the bottom ends of which are hinged to the top of the protective tube, each mesh pushing angle pyramid is provided with a strong magnetic member, and the strong magnetic members on the plurality of mesh pushing angle pyramids attract each other so that the top ends of the plurality of mesh pushing angle pyramids gather together;

[0007] The rotating bearing is mounted on the anchor drill bit, the anchor drill bit is arranged on the anchor frame, and the end of the anchor drill bit close to the rock surface is located in the protective tube;

[0008] A rubber cushion layer is located between the inner ring of the rotating bearing and the anchor drill bit, and is fixed to the inner ring of the rotating bearing;

[0009] The follow-up magnetic ring is fixedly connected to the outer ring of the rotating bearing through a support member, and the friction force between the rubber cushion layer and the anchor drill bit is smaller than the attraction force between the follow-up magnetic ring and the strong magnetic member.

[0010] Preferably, the multiple push net angle cone ends are gathered to form a cone structure, and the top is located on the side close to the rock mass; when the multiple push net angle cone ends are opened, the top forms an opening, and the opening can allow the anchor drill bit to pass through.

[0011] Preferably, the top end formed by gathering a plurality of said pushing net angle pyramids can correspond to the grid position of the flexible net on the rock surface, so that the flexible net can be stretched out when said pushing net angle pyramids are opened.

[0012] Preferably, there are four mesh pushing angle pyramids, and the strong magnetic parts on the four mesh pushing angle pyramids are all quarter strong magnetic rings.

[0013] Preferably, the anchor drill bit comprises:

[0014] The push cutter head can be located in the protective tube, and the maximum dimension of the outer edge is larger than the inner ring dimension of the rotating bearing;

[0015] The drill rod body is connected with the propulsion cutter head, the inner ring of the rotating bearing is sleeved on the drill rod body, and the rubber cushion layer is located between the inner ring of the rotating bearing and the drill rod body.

[0016] Preferably, the anchor drill bit further comprises a grouting hole, the grouting hole is located in the middle of the thrust cutter head, and the drill bit body has a slurry channel inside, the slurry channel is connected to the grouting hole.

[0017] Preferably, the protective tube is connected to the anchor rod frame via a fixed base, and the fixed base and the anchor rod frame are connected via bolts.

[0018] Preferably, the plurality of pushing net corner cones are hinged to the protective tube via a corner cone rotation axis.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention pushes away the mesh material that may be wound around the drill bit during drill construction, which can effectively prevent the anchor drill bit from being entangled with the mesh, thereby achieving the purpose of ensuring construction while not damaging the mesh material.

[0021] The top ends of the multiple pushing mesh angle cones of the pushing mesh component of the present invention can gather together, and when the end of the anchor drill bit contacts the rock surface, the strong magnetic parts of the multiple pushing mesh angle cones cooperate with the follow-up magnetic ring of the drill bit follower component of the present invention to achieve automatic opening, and the mesh materials on the outer periphery of the multiple pushing mesh angle cones are blocked outside the multiple pushing mesh angle cones, so that the anchor drill bit can smoothly pass through the top openings of the opened multiple pushing mesh angle cones to contact the rock surface to carry out drilling operations.

[0022] The present invention ingeniously designs the friction between the rubber cushion layer and the anchor drill bit to be smaller than the attraction between the follower magnetic ring and the strong magnetic part, so that when the multiple push net angles of the push net component are automatically opened, the follower magnetic ring and the strong magnetic part attract each other so that the follower magnetic ring no longer follows the anchor drill bit to advance toward the rock surface, and the multiple push net angle cones remain in a continuously open state, continuously preventing the mesh materials outside from wrapping around the anchor drill bit; the present invention realizes the automatic separation of the follower magnetic ring and the strong magnetic part after the anchor drill bit is completely retracted into the protective tube by the size difference between the inner ring size of the rotating bearing and the size of the advancing cutter head, so that the multiple push net angle cones automatically gather under the action of the strong magnetic part. The drill follower component of the present invention utilizes the movement of the anchor drill bit, and at the same time, the drill follower component and the push net component cooperate with each other to realize the automatic opening and gathering of multiple push net angle cones.

[0023] The present invention can be applied to various working conditions of mechanized construction of anchor net system, avoids the situation of rework due to entanglement of net, can further reduce construction time, improve efficiency, and has the advantages of safety, speed and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall schematic diagram of the present invention.

[0025] Figure 2 It is a schematic diagram of a net pushing component of the present invention.

[0026] Figure 3 It is a schematic diagram of the drill follower component of the present invention.

[0027] Figure 4 It is a schematic diagram of the construction of the anti-entanglement net of the present invention.

[0028] Description of reference numerals:

[0029] 100. net pushing component, 101. protective tube, 102. net pushing pyramid, 103. strong magnetic component, 104. pyramid rotating shaft, 105. fixed base;

[0030] 200. drill follower component, 201. rotating bearing, 202. follower magnetic ring, 203. rubber cushion, 204. support member, 205. support base;

[0031] 300. Anchor frame;

[0032] 400. Anchor drill bit, 401. Push cutter head, 402. Grouting hole, 403. Drill bit body. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0034] Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Please refer to Figure 1 The present embodiment discloses a device for preventing the anchor drill bit from being entangled in a net, which is mounted on an anchor frame 300. The anchor frame 300 is arranged at one end of the anchor working arm close to the rock surface, and includes a net pushing component 100 and a drill follower component 200. Please refer to Figure 2 The pushing net component 100 of this embodiment includes a protective tube 101, which is fixed on the anchor frame 300; a plurality of pushing net angle cones 102, the bottom ends of which are hinged on the top of the protective tube 101, and each pushing net angle cone 102 is provided with a strong magnetic component 103, and the strong magnetic components 103 on the plurality of pushing net angle cones 102 attract each other to gather the ends of the plurality of pushing net angle cones 102; there is no special requirement for the shape of the strong magnetic component 103, as long as the plurality of pushing net angle cones 102 can be attracted to each other to achieve the purpose of gathering, and the layout position of the strong magnetic component 103 is preferably such that the top opening formed by the opening of the plurality of pushing net angle cones 102 allows the anchor drill bit 400 to pass through.

[0036] Please refer to Figure 3The drill follower component 200 of this embodiment includes a rotating bearing 201, which is mounted on the anchor drill bit 400. The anchor drill bit 400 is connected to the anchor frame 300, and the end of the anchor drill bit 400 close to the rock surface is located in the protective tube 101; the rubber cushion layer 203 is located between the inner ring of the rotating bearing 201 and the anchor drill bit 400, and is fixed to the inner ring of the rotating bearing 201; the follower magnetic ring 202 is fixedly connected to the outer ring of the rotating bearing 201 through the support member 204 The support member 204 can be a plurality of support rods, which are evenly arranged along the axial direction. In order to connect and stabilize the support rods, the support rods are connected to the outer ring of the rotating bearing 201 through a support base 205. The support base 205 is fixed on the outer ring of the rotating bearing 201. The plurality of support rods correspond to the plurality of support bases 205 one by one, and the bottom end of each support rod is fixed on the support base 205. As the follow-up magnetic ring 202 moves, the follow-up magnetic ring 202 is attracted to the strong magnetic member 103, and the plurality of push net angle cones 102 are opened.

[0037] In this embodiment, the rotating bearing 201 can realize the follow-up magnetic ring 202 to move forward with the anchor drill bit 400, but the drill follower component 200 as a whole does not rotate with the anchor drill bit 400. Since the follow-up magnetic ring 202 is connected to the outer ring of the rotating bearing 201 through the support member 204, the follow-up magnetic ring 202 can follow the rotating bearing 201 and maintain synchronous advancement with the anchor drill bit 400. Since the rotating bearing 201 and the anchor drill bit 400 are not fixedly connected, when the follow-up magnetic ring 202 moves to be attracted by the strong magnetic member 103, the forward advancement of the rotating bearing 201 is hindered, causing the rotating bearing 201 and the anchor drill bit 400 to slide relative to each other in the advancement direction. While the inner ring of the rotating bearing 201 slides relative to the anchor drill bit 400, it will not affect the rotation of the anchor drill bit 400, thereby ensuring that the movement process of the entire anchor drill bit 400 is not affected. After the anchor drill bit 400 passes through the top openings of the opened multiple push mesh angle cones 102, it contacts the rock surface and performs the drilling operation. In this embodiment, before drilling, the multiple push mesh angle cones 102 and the protective tube 101 form a protection for their internal components because the tops of the multiple push mesh angle cones 102 are gathered together. Please refer to Figure 4 When the anchor drill bit 400 is advanced toward the rock surface, as the anchor drill bit 400 is advanced, multiple mesh pushing angle cones 102 are opened, and the mesh material that may be entangled on the anchor drill bit 400 is blocked outside the multiple mesh pushing angle cones 102, thereby preventing the anchor drill bit 400 from being entangled in the mesh and affecting the drilling operation.

[0038] As a disclosure method of this embodiment, the friction force between the rubber cushion layer 203 and the anchor drill bit 400 is smaller than the attraction magnetic force between the follower magnetic ring 202 and the strong magnetic part 103. The difference in the magnitude of the friction force and the magnetic force is cleverly designed to achieve the purpose of preventing the follower magnetic ring 202 and the rotating bearing 201 from following the anchor drill bit 400 to continue to advance after the follower magnetic ring 202 and the strong magnetic part 103 are attracted; the multiple mesh pushing cones 102 opened at the same time will not automatically gather due to the constraint of the follower magnetic ring 202, and can remain in a continuously open state, continuously blocking the mesh material, and better preventing the mesh material from winding around the anchor drill bit 400.

[0039] As a disclosed method of this embodiment, when the ends of the multiple push net angle cones 102 are gathered together, a cone structure is formed, and the top is located on the side close to the rock mass; when the ends of the multiple push net angle cones 102 are opened, an opening is formed at the top, and the opening can allow the anchor drill bit 400 to pass through.

[0040] As a disclosure method of this embodiment, the top formed by the gathering of multiple net pushing angle cones 102 can correspond to the grid position of the flexible net on the rock surface, so that the flexible net can be stretched out when the net pushing angle cones 102 are opened.

[0041] As a disclosed method of this embodiment, there are four mesh pushing angle cones 102, and the strong magnetic parts 103 on the four mesh pushing angle cones 102 are all quarter strong magnetic rings.

[0042] As a disclosure method of this embodiment, the anchor drill bit 400 includes:

[0043] The maximum dimension of the outer edge of the advancing cutter head 401 is larger than the inner ring dimension of the rotating bearing 201;

[0044] The drill bit rod body 403 is connected to the thrust cutter head 401, the inner ring of the rotating bearing 201 is sleeved on the drill bit rod body 403, and the rubber cushion layer 203 is located between the inner ring of the rotating bearing 201 and the drill bit rod body 403. In the process of retreating the thrust cutter head 401 of this embodiment after the drilling is completed, when the thrust cutter head 401 contacts the rotating bearing 201, since the maximum size of the outer edge of the thrust cutter head 401 is larger than the inner ring size of the rotating bearing 201, a force away from the rock surface is applied to the rotating bearing 201, and since the force is powered by the motor of the anchor drill bit 400, it is sufficient to separate the follower magnetic ring 202 from the strong magnetic part 103. Therefore, this embodiment utilizes the size difference between the inner ring size of the thrust cutter head 401 and the rotating bearing 201 to realize the automatic separation of the follower magnetic ring 202 and the strong magnetic part 103, thereby realizing the automatic gathering, i.e., automatic closing, of multiple push net angle cones 102.

[0045] As a disclosed mode of this embodiment, the anchor drill bit 400 further includes a grouting hole 402, and the grouting hole 402 is located at the center of the thrust cutter head 401. The grouting hole 402 is used to facilitate cleaning of the drill hole after the drilling is completed.

[0046] As a disclosed mode of this embodiment, the protective tube 101 is connected to the anchor frame 300 via a fixed base 105, and the fixed base 105 and the anchor frame 300 are connected via bolts, thereby realizing a detachable connection between the protective tube 101 and the anchor frame 300, which is convenient for maintenance and replacement.

[0047] As a disclosed method of this embodiment, the plurality of pushing net angle cones 102 are hinged to the protective tube 101 via an angle cone rotating shaft 104 .

[0048] The method for preventing the anchor drill bit from being entangled with the net device during construction of a hole by using the present invention is as follows:

[0049] 1 Preparation

[0050] During the mechanized construction of anchor net, the device to prevent the anchor drill bit from being entangled in the net is carried on the anchor working arm. The anchor frame 300 is arranged at one side of the end of the anchor working arm and is responsible for carrying the entire device. In the preparation stage, the anchor drill bit 400 is installed on the anchor working arm, and the drill follower component 200 is installed on the side of the anchor drill bit 400 close to the thrust cutter head 401. The net pushing component 100 is fixed to the anchor frame 300 by bolts of the fixed base 105. At this time, the net pushing angle cone 102 is in a closed state. The overall arrangement is as follows: Figure 1 shown.

[0051] 2 Drilling stage

[0052] After the preparation stage is completed, the drilling work begins. The drilling anchor arm is raised to the vicinity of the drilling position, the push mesh cone 102 is placed near the rock surface, and the anchor drill bit 400 is pushed forward. At this time, due to the friction between the rubber cushion layer 203 and the drill rod body 403, the drill follower component 200 and the anchor drill bit 400 move forward together. When the follower magnetic ring 202 touches the push mesh cone 102, the push mesh cone 102 gradually opens during the continued forward movement, and the mesh material in front of the push cutter head 401 is controlled on the outside of the push mesh cone 102, providing a good working area for subsequent drill drilling.

[0053] In this embodiment, the strong magnetic member 103 is preferably four quarter strong magnetic rings, and the corresponding push net angle cone 102 is four, corresponding to the four quarter strong magnetic rings. When the follower magnetic ring 202 moves to the position of the quarter strong magnetic ring, the magnetic force between the two is greater than the friction between the rubber cushion layer 203 and the drill rod 403, and the drill follower component 200 does not continue to advance with the anchor drill 400, and maintains the open angle of the push net angle cone 102. After the push cutter head 401 reaches the rock surface, the drilling and rock breaking work begins. Due to the existence of the rotating bearing 201, the inner ring of the rotating bearing 201 rotates with the drill rod 403, and the outer ring of the bearing is not affected. After the anchor drill 400 is pushed to the specified depth, water is injected through the grouting hole 402 to clean the gravel in the hole and complete the drilling work.

[0054] 3. Recovery Phase

[0055] The anchor drill bit 400 is retracted. At this time, due to the magnetic force between the follower magnetic ring 202 and the quarter strong magnetic ring, the drill follower component 200 is not retracted together, and the open angle of the push net angle cone 102 is maintained. When the push cutter head 401 is retracted into the protective tube 101, since the size of the cutter head is larger than the inner diameter of the rotating bearing 201, the follower magnetic ring 202 and the quarter strong magnetic ring are separated, and the magnetic force between the quarter strong magnetic rings completes the closure of the push net angle cone 102 and returns to the initial stage.

[0056] After the drilling operation is completed, anchor rods are installed to fix the metal mesh / flexible mesh, and finally concrete is sprayed to complete the mechanized construction of the anchor mesh system.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preventing an anchor drill bit from being entangled in a net, mounted on an anchor frame (300), wherein the anchor frame (300) is arranged at one end of an anchor working arm close to a rock surface, and characterized in that: include: A protective tube (101) fixed on the anchor rod frame (300); A plurality of net pushing angle pyramids (102), the bottom ends of which are hinged to the top of the protective tube (101), each net pushing angle pyramid (102) is provided with a strong magnetic component (103), and the strong magnetic components (103) on the plurality of net pushing angle pyramids (102) attract each other so that the top ends of the plurality of net pushing angle pyramids (102) are gathered together; When the ends of the plurality of push net angle pyramids (102) are gathered together, a cone structure is formed, and the top end is located on a side close to the rock mass; when the ends of the plurality of push net angle pyramids (102) are opened, an opening is formed at the top end, and the opening can allow the anchor drill bit (400) to pass through; The top ends formed by the gathering of a plurality of the net-pushing angle pyramids (102) can correspond to the grid positions of the flexible net on the rock surface, so that the flexible net can be spread out when the net-pushing angle pyramids (102) are opened; A rotating bearing (201) is mounted on an anchor drill bit (400). The anchor drill bit (400) is arranged on the anchor frame (300). The end of the anchor drill bit (400) close to the rock surface is located in a protective tube (101); A rubber cushion layer (203) is located between the inner ring of the rotating bearing (201) and the anchor drill bit (400), and is fixed to the inner ring of the rotating bearing (201); The follower magnetic ring (202) is fixedly connected to the outer ring of the rotating bearing (201) via a support member (204), and the friction force between the rubber cushion layer (203) and the anchor drill bit (400) is smaller than the attraction force between the follower magnetic ring (202) and the strong magnetic member (103).

2. The device for preventing anchor drill bit from being entangled in the net according to claim 1, characterized in that: There are four mesh pushing angle pyramids (102), and the strong magnetic parts (103) on the four mesh pushing angle pyramids (102) are all quarter strong magnetic rings.

3. The device for preventing anchor drill bit from being entangled in the net according to claim 1, characterized in that: The anchor drill bit (400) comprises: The thrust cutter head (401) can be located in the protective tube (101), and the maximum dimension of the outer edge is larger than the inner ring dimension of the rotating bearing (201); The drill bit rod body (403) is connected to the thrust cutter head (401), the inner ring of the rotating bearing (201) is sleeved on the drill bit rod body (403), and the rubber cushion layer (203) is located between the inner ring of the rotating bearing (201) and the drill bit rod body (403).

4. The device for preventing anchor drill bit from being entangled in the net as claimed in claim 3, characterized in that: The anchor drill bit (400) further comprises a grouting hole (402), the grouting hole (402) is located in the middle of the thrust cutter head (401), and a slurry channel is provided inside the drill bit rod body (403), and the slurry channel is communicated with the grouting hole (402).

5. The device for preventing anchor drill bit from being entangled in a net as claimed in claim 1, characterized in that: The protective tube (101) is connected to the anchor rod frame (300) via a fixed base (105), and the fixed base (105) and the anchor rod frame (300) are connected via bolts.

6. The device for preventing anchor drill bit from being entangled in a net as claimed in claim 1, characterized in that: The plurality of pushing net angle cones (102) are hingedly connected to the protective tube (101) via angle cone rotating shafts (104).

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