Anchor rod retaining device

Abstract

The utility model discloses an anchor rod retaining device which comprises a fixed ring and a movable pipe. The anchor rod is sleeved with the fixed ring, the fixed ring and the anchor rod rotate synchronously, the movable pipe is provided with a through hole with the inner diameter larger than the outer diameter of the anchor rod, a plurality of retaining pieces are arranged at the lower end of the movable pipe, the upper end of each retaining piece is connected with the lower end of the movable pipe, and all the retaining pieces are distributed in the circumferential direction of the movable pipe. The anchor rod is sleeved with the movable pipe through the through hole, the fixed ring is located below the movable pipe, the anchor rod drives the fixed ring to rotate upwards, then the fixed ring pushes the movable pipe to enter a drill hole, and all the retaining pieces are unfolded towards the periphery. The anchor rod stopping function is added, the probability that the anchor rod falls off is reduced, and the safety coefficient of mine construction is improved.

Description

Technical Field

[0001] The utility model relates to the field of anchor rods, in particular to an anchor rod retreat stopper. Background Art

[0002] Mine anchors are tools used in mine tunnels and underground engineering surrounding rock support to ensure the stability of mine tunnels and underground engineering surrounding rock. For anchor support in mines, some anchors need to be installed vertically upward. The construction method of the upward anchor is to provide a drill bit at the upper end of the anchor, connect the drill rig to the lower end of the anchor, and drive the anchor upward through the drill rig. However, when the anchors are connected, the drill will be temporarily separated from the anchor. Since the existing anchors do not have a stop structure, in this case, after the drill rig and the anchor fall off, the anchor may fall and cause a safety accident. Utility Model Content

[0003] Aiming at the defects in the prior art, the anchor bolt stop function is increased, the probability of the anchor bolt falling off is reduced, and the safety factor of mine construction is improved. The utility model provides an anchor bolt stopper, including a fixed ring and a movable tube; the fixed ring is sleeved on the anchor bolt and the fixed ring rotates synchronously with the anchor bolt, the movable tube is provided with a through hole with an inner diameter larger than the outer diameter of the anchor bolt, a plurality of stop plates are provided at the lower end of the movable tube, the upper end of each stop plate is connected to the lower end of the movable tube, and all the stop plates are distributed along the circumference of the movable tube; the movable tube is sleeved on the anchor bolt through the through hole, and the fixed ring is located below the movable tube, and the fixed ring is driven to rotate upward by the anchor bolt, so that the fixed ring pushes the movable tube into the drill hole and all the stop plates are spread out toward the surroundings.

[0004] The beneficial effect of this equipment is that during construction, the drill bit at the upper end of the anchor rod drills into the rock formation first, and the fixed ring drills into the rock formation synchronously with the anchor rod. Since the outer diameter of the fixed ring is larger than the through hole of the movable tube, during the drilling process, the fixed ring pushes the movable tube to move upward and enter the borehole drilled by the drill bit. There is friction between the thrust plate and the borehole, so the movable tube only moves up along the borehole without rotating. As the fixed ring presses against the bottom of the stop plate, all the stop plates are spread out in all directions and pressed against the borehole. If the anchor rods are connected to each other, and the drilling rig is separated from the anchor rod, since the stop plate is stuck in the borehole, even if the anchor rod loosens and moves downward, the drill bit will touch the movable tube, thus preventing the anchor rod from continuing to fall, thereby greatly reducing the probability of the anchor rod falling off and improving the safety factor of mine construction.

[0005] Preferably, there are four stop plates. The four stop plates are evenly distributed along the circumference of the movable tube, and then a stop claw is formed at the lower end of the movable tube. The minimum inner diameter of the stop claw is smaller than the outer diameter of the fixing ring. During the drilling process, the four stop plates are equivalent to barbs, which are tightly stuck in the drill hole, and the anchor rod can only move upward, but cannot move downward from the stop claw, thereby playing a role in preventing falling.

[0006] Preferably, the fixing ring, the movable tube and the retaining plate are all made of steel.

[0007] Preferably, the anti-retraction plate is integrated with the movable tube or the anti-retraction plate and the movable tube are fixedly connected by welding.

[0008] Preferably, the maximum outer diameter of the back-off claw is larger than the outer diameter of the anchor drill bit. After the back-off claw is pushed open by the fixing ring and expanded, the four thrust plates must be pressed tightly against the side wall of the drill hole, so the back-off claw must be larger than the outer diameter of the drill bit after expansion.

[0009] Preferably, the upper side of the fixing ring is provided with a chamfer or a rounded corner, which facilitates the pushing open of the anti-retraction claw.

[0010] Preferably, the fixing ring is located on the upper part of the anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0012] Figure 1 It is a structural schematic diagram of this embodiment;

[0013] Figure 2 for Figure 1 A top view of

[0014] Figure 3 It is a schematic diagram of the anchor rod back-off device and the anchor rod after being assembled in this embodiment.

[0015] In the accompanying drawings, there are a fixed ring 1, a movable tube 2, a through hole 3, a stop plate 4, and an anchor rod 5. DETAILED DESCRIPTION

[0016] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0017] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0018] like Figure 1As shown, this embodiment provides an anchor rod backstop, comprising a fixing ring 1 and a movable tube 2. The fixing ring 1 is sleeved on the anchor rod 5 and the fixing ring 1 rotates synchronously with the anchor rod 5. The fixing ring 1 and the anchor rod 5 can be fixedly connected by welding, which is simple to process and low in cost. Furthermore, the fixing ring 1 is located on the upper part of the anchor rod 5, and the fixing ring 1 is adjacent to the drill bit at the upper end of the anchor rod 5.

[0019] like Figure 1 , Figure 2 As shown, the movable tube 2 in this embodiment is provided with a through hole 3 whose inner diameter is larger than the outer diameter of the anchor rod 5, and the through hole 3 is smaller than the drill bit. The movable tube 2 and the anchor rod 5 can rotate relative to each other. The lower end of the movable tube 2 is provided with four stopper plates 4, and the upper end of each stopper plate 4 is connected to the lower end of the movable tube 2, and all the stopper plates 4 are evenly distributed along the circumference of the movable tube 2. Furthermore, the stopper plates 4 are integrated with the movable tube 2 or the stopper plates 4 are fixedly connected to the movable tube 2 by welding.

[0020] The four anti-recoil plates 4 in this embodiment are evenly distributed along the circumference of the movable tube 2, so as to form an anti-recoil claw at the lower end of the movable tube 2. The minimum inner diameter of the anti-recoil claw is smaller than the outer diameter of the fixed ring 1. During the drilling process, the four anti-recoil plates 4 are equivalent to barbs, which are tightly stuck in the drill hole. The anchor rod 5 can only move upwards, but cannot break away from the anti-recoil claw and move downwards, thereby playing a role in preventing falling. Furthermore, the maximum outer diameter of the anti-recoil claw is larger than the outer diameter of the anchor rod 5 drill bit. After the anti-recoil claw is pushed open by the fixed ring 1 and the anti-recoil claw is unfolded, the four thrust plates must be pressed against the side wall of the drill hole, so the anti-recoil claw must be larger than the outer diameter of the drill bit after it is unfolded.

[0021] like Figure 3 As shown, in this embodiment, the materials of the fixed ring 1, the movable tube 2 and the stopper 4 are all made of steel. Before construction, the through hole 3 of the movable tube 2 is sleeved on the anchor rod 5, and the movable tube 2 is located between the drill bit and the fixed ring 1. The anchor rod 5 drives the fixed ring 1 to rotate upward, so that the fixed ring 1 pushes the movable tube 2 into the drill hole and all the stopper 4 are spread out in all directions. In order to facilitate the opening of the stopper claw, the upper side of the fixed ring 1 is provided with a chamfer or a rounded corner. During the construction process of the anchor rod 5, since the outer diameter of the fixed ring 1 is larger than the through hole 3 of the movable tube 2, during the drilling process, the fixed ring 1 pushes the movable tube 2 to move upward and enter the drilled hole together. There is friction between the stopper and the drill hole, so the movable tube 2 only moves up along the drill hole without rotating. As the fixed ring 1 presses against the bottom of the stopper 4, all the stopper 4 are spread out in all directions and pressed against the drill hole. If the anchor rods 5 are connected to the anchor rods 5 and the drilling rig is separated from the anchor rods 5, since the stop plate 4 is stuck in the drill hole, even if the anchor rods 5 loosen and move downward, the drill bit will touch the movable tube 2, thus preventing the anchor rods 5 from continuing to fall, thereby greatly reducing the probability of the anchor rods 5 falling off and improving the safety factor of mine construction.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An anchor bolt stopper, characterized in that: It includes a fixed ring and a movable tube; the fixed ring is sleeved on the anchor rod and the fixed ring rotates synchronously with the anchor rod, the movable tube is provided with a through hole with an inner diameter larger than the outer diameter of the anchor rod, and a plurality of stop plates are provided at the lower end of the movable tube, the upper end of each stop plate is connected to the lower end of the movable tube, and all the stop plates are distributed along the circumference of the movable tube; the movable tube is sleeved on the anchor rod through the through hole, and the fixed ring is located below the movable tube, and the fixed ring is driven to rotate upward by the anchor rod, so that the fixed ring pushes the movable tube into the drill hole and all the stop plates are spread out toward the surroundings.

2. The anchor bolt stopper according to claim 1, characterized in that: The anti-retraction pieces are provided with four.

3. The anchor bolt stopper according to claim 2, characterized in that: The four back-stopping plates are evenly distributed along the circumference of the movable tube, thereby forming a back-stopping claw at the lower end of the movable tube.

4. The anchor bolt stopper according to claim 3, characterized in that: The minimum inner diameter of the back-stop claw is smaller than the outer diameter of the fixing ring.

5. The anchor bolt stopper according to claim 1, characterized in that: The materials of the fixing ring, the movable tube and the anti-retraction plate are all made of steel.

6. The anchor bolt stopper according to claim 1, characterized in that: The anti-retraction piece is integrated with the movable tube or the anti-retraction piece and the movable tube are fixedly connected by welding.

7. The anchor bolt stopper according to claim 3, characterized in that: The maximum outer diameter of the back-stop claw is greater than the outer diameter of the anchor drill bit.

8. The anchor bolt stopper according to claim 1, characterized in that: The upper side of the fixing ring is provided with a chamfer or a rounded corner.

9. The anchor bolt stopper according to claim 1, characterized in that: The fixing ring is located on the upper part of the anchor rod.

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