Coal roadway anchor rod

Abstract

The utility model provides a coal roadway anchor rod, and relates to the technical field of anchor rods, the coal roadway anchor rod comprises a rod body and a limiting piece sleeved on the rod body, two surfaces of the limiting piece are respectively provided with a screw cap in a threaded manner, the rod body is further sleeved with an expansion body, and the screw caps can rotate to extrude the expansion body to expand; the anchor rod can be fixed and installed on conventional cement, can also be installed and used on a wall body or a rock body, can be nailed into the rock body or the wall body to increase friction force and support effect through expansion, and improves the stability of the whole anchor rod.

Description

Technical Field

[0001] This utility model relates to the technical field of anchor bolts, and more particularly to an anchor bolt for coal mine roadways. Background Technology

[0002] Rock bolts are a fundamental component of roadway support in modern coal mines. They reinforce the surrounding rock of the roadway, allowing the rock to support itself. Conventional rock bolts have raised threads on their outer surface to allow them to contact the cement slurry and fix them to the cement. However, when used in already fixed locations, rock bolts need to be driven into the wall or ore body. Due to the threads, the stability of the rock bolt may be affected, thus compromising its safety. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a coal roadway anchor bolt to solve the problem of potential instability when the anchor bolt is driven into the wall.

[0004] Based on the technical problems existing in the background art, this utility model proposes a coal roadway anchor bolt, including a rod body and a limiting plate sleeved on the rod body. Both sides of the limiting plate are threaded with nuts. An expansion body is also sleeved on the rod body. The nuts can be rotated to compress the expansion body to expand.

[0005] Preferably, the rod body includes a threaded rod and a fixed rod, one end of the threaded rod and one end of the fixed rod are fixed at the same center, and the diameter of the threaded rod is smaller than the diameter of the fixed rod.

[0006] Preferably, the limiting piece has a circular hole in the middle, and the circular hole corresponds to the threaded rod sleeve.

[0007] Preferably, the outer surface of the fixing rod is provided with a spiral protrusion.

[0008] Preferably, the expansion body is tubular, and a groove parallel to the axis of the expansion body is provided on the side of the expansion body. The side of the expansion body is divided into side bodies by the groove. One end of the expansion body abuts against the fixing rod, and the other end abuts against the nut near the expansion body.

[0009] Preferably, the side body is provided with an outwardly protruding arc-shaped collapse body.

[0010] Compared with the prior art, the coal roadway anchor bolt proposed in this utility model adopts the above-mentioned technical solution and achieves the following technical effects:

[0011] This invention can be used for fixing and installing with conventional cement, as well as for installing on walls or rock. When nailed into rock or wall, this invention can increase friction and support by expansion, thereby improving the stability of the entire anchor rod. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 2 This is an enlarged schematic diagram of region A of this utility model.

[0014] In the diagram: 1. Rod; 2. Limiting plate; 3. Nut; 4. Expansion body; 11. Threaded rod; 12. Fixing rod; 121. Protrusion; 41. Groove; 42. Side body; 421. Arc-shaped collapsible body. Detailed Implementation

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0017] Example

[0018] Please refer to Figures 1-2 This utility model proposes a coal roadway anchor bolt, including a rod body 1 and a limiting plate 2 sleeved on the rod body 1. The limiting plate 2 is square and has a round hole in the center. The round hole of the limiting plate 2 is sleeved on the rod body 1. Nuts 3 are threaded on both sides of the limiting plate 2. The two nuts 3 can fix the limiting plate 2 on the rod body 1. An expansion body 4 is also sleeved on the rod body 1. The nuts 3 can be twisted on the rod body 1 to compress the expansion body 4, so that the distance between the two ends of the expansion body 4 is reduced, and then it expands and widens, so that the entire device can be fixed in the rock mass or wall.

[0019] In a specific embodiment, refer to Figure 1 , Figure 2The rod body 1 includes a threaded rod 11 and a fixed rod 12. The fixed rod 12 can be used for fixing in cement. The threaded rod 11 is used for installing the nut 3. Its expansion body 4 is installed on the threaded rod 11. One end of the threaded rod 11 is fixed with one end of the fixed rod 12 at the same center. The diameter of the threaded rod 11 is smaller than the diameter of the fixed rod 12. One end of the expansion body 4 will abut against the end of the fixed rod 12 that connects to the threaded rod 11. A sharp drill bit can also be set at the end of the fixed rod 12 away from the threaded rod 11 to facilitate installation.

[0020] In a specific embodiment, refer to Figure 1 , Figure 2 The outer side of the fixing rod 12 is provided with a spiral protrusion 121. The protrusion 121 on the outer side of the fixing rod 12 can effectively increase the adhesion between the outer surface of the fixing rod 12 and the cement. Of course, the protrusion 121 in this application can be of any shape. The spiral protrusion 121 also makes it easier for the entire device to be nailed into the rock or wall without too much resistance, which would cause the problem of installation failure.

[0021] In a specific embodiment, refer to Figure 1 , Figure 2 The expansion body 4 is tubular, and a groove 41 parallel to the axis of the expansion body 4 is provided on its side. The side of the expansion body 4 is divided into side bodies 42 by the groove 41. One end of the expansion body 4 abuts against the fixing rod 12, and the other end abuts against the nut 3 near the expansion body 4. In this application, the strip groove provided on the expansion body 4 is used to divide the side bodies 42, so that each side body 42 can be bent independently and the bending between the side bodies 42 will not affect each other. In a further embodiment, the gap between the side bodies 42 is exposed. When cement is used for fixing, cement will enter the expansion body 4 from the gap. When the cement and the fixing body become loose, the expansion body 4 cannot be used. Therefore, a thin metal partition can be provided between two adjacent side bodies 42. When the side body 42 deforms, the thin metal partition can break with the side body 42 without affecting the deformation of the side body 42, which can further improve the practicality of the whole device.

[0022] In a specific embodiment, refer to Figure 1 , Figure 2 The side body 42 is provided with an outwardly protruding arc-shaped collapse body 421. In this application, the arc-shaped collapse body 421 is located in the middle region of the side body 42. When the two ends of the expansion body 4 are squeezed, the side body 42 will be squeezed and deformed. However, the deformation of the side body 42 may be outward or inward. Its arc-shaped collapse body 421 can guide the side body 42 to deform outward, thereby supporting the wall or rock mass.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A coal roadway anchor bolt, characterized in that, It includes a rod (1) and a limiting piece (2) fitted on the rod (1). Both sides of the limiting piece (2) are threaded with nuts (3). An expansion body (4) is also fitted on the rod (1). The nuts (3) can be rotated to compress the expansion body (4) to expand. The expansion body (4) is tubular. The side of the expansion body (4) is provided with a groove (41) parallel to the axis of the expansion body (4). The side of the expansion body (4) is divided into a side body (42) by the groove (41). One end of the expansion body (4) abuts against the fixing rod (12), and the other end abuts against the nut (3) near the expansion body (4).

2. The coal roadway anchor bolt according to claim 1, characterized in that, The rod body (1) includes a threaded rod (11) and a fixed rod (12). One end of the threaded rod (11) is fixed with one end of the fixed rod (12) at the same center. The diameter of the threaded rod (11) is smaller than the diameter of the fixed rod (12).

3. The coal roadway anchor bolt according to claim 2, characterized in that, The center of the limiting piece (2) is provided with a round hole, which is connected to the threaded rod (11).

4. The coal roadway anchor bolt according to claim 2, characterized in that, The outer side of the fixing rod (12) is provided with a spiral protrusion (121).

5. The coal roadway anchor bolt according to claim 1, characterized in that, The side body (42) is provided with an outwardly protruding arc-shaped collapse body (421).

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