A pressure-releasing locking ring for coal mine support

Abstract

The present invention discloses a pressure-releasing locking ring for coal mine support, comprising an anchor rod, an anchor rod tray and a locking nut, wherein the anchor rod tray is close to the support surface, the exposed end of the anchor rod is screwed into the locking nut for fixing, a locking kit and a pressure-releasing kit are arranged in sequence from top to bottom between the locking nut and the anchor rod tray, the locking kit comprises two upper and lower trapezoidal truncated cone-shaped outer sleeves and inner sleeves which are sleeved on the anchor rod, the upper narrow end of the inner sleeve is embedded in the lower wider end of the outer sleeve, and sealing rings are arranged at the contact position between the outer sleeve and the anchor cable tray and at the contact position between the outer sleeve and the inner sleeve, and the outer half of the outer sleeve is wrapped with a locking sleeve. The pressure-releasing locking ring structure can improve the compressive strength of the supporting anchor rod to a certain extent, reduce the problem of anchor rod breakage in deeper mining areas, and ensure a safe working environment for coal miners.

Description

Technical Field

[0001] The invention relates to the technical field of mining support engineering equipment, and more particularly to a pressure-releasing locking ring for coal mine support. Background Art

[0002] So far, the rate of bolt support or cable support in key state-owned coal mines has reached 60%, and some mining areas have exceeded 90%. Bolt support has become the preferred, safe and efficient support method for coal mine tunnels in my country. In mining projects, with the continuous increase in the depth of coal mining, many unprecedented complex and difficult tunnels have emerged, including deep high-altitude stress tunnels, tunnels with extra-large sections, tunnels left along the goaf and excavated, tunnels affected by strong mining, and soft and damaged tunnels. The increase in surrounding rock stress has led to the fracture and failure of a large number of anchors (anchor cables), leaving the tunnel in an unsupported state, seriously threatening the safe production of the mine and the physical and mental health of coal mine workers. Therefore, relevant protection structures are designed to improve the stability, safety and compressive strength of the anchors. Summary of the invention

[0003] The purpose of the present invention is to provide a pressure-releasing locking ring for coal mine support, the pressure-releasing locking ring structure can improve the compressive resistance of the support anchor rod to a certain extent, reduce the problem of anchor rod breakage in deeper mining areas, and ensure a safe working environment for coal miners.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A pressure-releasing locking ring for coal mine support, comprising an anchor rod, an anchor rod tray and a locking nut, wherein the anchor rod tray is in close contact with the support surface, the exposed end of the anchor rod is screwed into the locking nut for fixing, a locking kit and a pressure-releasing kit are arranged in sequence from top to bottom between the locking nut and the anchor rod tray, the locking kit comprises two upper and lower trapezoidal truncated cone-shaped outer sleeves and inner sleeves which are sleeved on the anchor rod, the upper narrow end of the inner sleeve is embedded in the lower wider end of the outer sleeve, and the outer sleeve contacts the anchor cable tray and the inner sleeve of the outer sleeve The contact positions are all provided with sealing rings, the outer periphery of the upper half of the outer sleeve is wrapped with a locking sleeve, a plurality of reaction force push rods are distributed in an annular manner equidistantly outwardly around the locking sleeve, the pressure-releasing kit comprises two upper and lower disc plates of the same area, wherein the upper disc plate is pressed against the inner sleeve on the top and a limiting ring is fixed around it by a plurality of connecting rods distributed in an annular manner equidistantly, a plurality of spring pressure rods distributed in a circular manner are provided between the upper and lower disc plates of the same area, and a locking nut is screwed on the bottom of the lower disc plate.

[0006] Furthermore, the reaction force push rod is arc-shaped, one end of the reaction force push rod is welded and fixed to the outer side surface of the locking sleeve, and the arc-shaped top surface is pressed against the supporting surface.

[0007] Furthermore, compressed air is filled into the gap between the outer sleeve and the inner sleeve to form an air pressure chamber.

[0008] Furthermore, the spring pressure rods are equidistantly distributed around the centers of the upper and lower disc plates with the same area.

[0009] Furthermore, the diameter of the disc plate is larger than the diameter of the locking nut and the maximum diameter of the outer sleeve.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] The present invention increases the resistance to the stress of the surrounding rock in different directions around the anchor rod by arranging a pressure-relieving kit. The stress acts directly on the rod body of the spring pressure rod. The spring pressure rod is bent to the outside and blocked by the limit ring, forming a reverse resistance and a pressure-relieving stroke, thereby alleviating the damage of the surrounding rock stress to the anchor rod body or the anchor cable body, so that the anchor rod body or the anchor cable body maintains the original preload force; by arranging a locking kit, when the axial stress of the anchor rod suddenly increases, the inner sleeve is pressed into the outer sleeve, and the internal air pressure chamber cooperates with the reaction force push rods on all sides to help the anchor rod buffer and dissipate energy, thereby reducing the breakage of the anchor rod. During the process, the locking sleeve is used to apply pressure inwards to avoid the inner part of the outer sleeve from swelling, cracking and breaking, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0013] Figure 2 It is the front view of the overall structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the internal structure of the outer sleeve and the inner sleeve of the present invention;

[0015] In the figure: 1. anchor rod; 2. anchor rod tray; 3. locking nut; 4. locking sleeve; 5. inner sleeve; 6. outer sleeve; 7. sealing ring; 8. disc plate; 9. limiting ring; 10. spring pressure rod; 11. reaction force push rod; 12. connecting rod; 13. air pressure chamber. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects of the invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0017] like Figures 1 to 3As shown, a pressure-releasing locking ring for coal mine support comprises an anchor rod 1, an anchor rod tray 2 and a locking nut 3. The anchor rod tray 2 is tightly attached to the supporting surface, and the exposed end of the anchor rod 1 is screwed into the locking nut 3 for fixing. A locking kit and a pressure-releasing kit are arranged in sequence from top to bottom between the locking nut 3 and the anchor rod tray 2. The locking kit comprises an upper and lower trapezoidal truncated cone-shaped outer sleeve 6 and an inner sleeve 5 which are sleeved on the anchor rod 1. The upper narrow end of the inner sleeve 5 is nested into the lower wider end of the outer sleeve 6, and sealing rings 7 are sleeved at the contact position between the outer sleeve 6 and the anchor cable tray 2 and the contact position between the outer sleeve 6 and the inner sleeve 5. The outer half of the outer sleeve 6 is wrapped with a locking sleeve 4, and a plurality of reaction force push rods 11 are distributed equidistantly around the locking sleeve 4. There are disc plates 8 with the same area, among which the upper disc plate 8 is pressed against the inner sleeve 5 and is fixed with a limiting ring 9 by a number of connecting rods 12 equidistantly distributed in an annular pattern around it. A number of spring pressure rods 10 distributed in a circle are arranged between the upper and lower disc plates 8 with the same area. The locking nut 3 is screwed on the lower disc plate 8. The reaction force push rod 11 is arc-shaped. One end of the reaction force push rod 11 is welded and fixed to the outer side surface of the locking sleeve 4 and the arc-shaped top surface is pressed against the supporting surface. Compressed air is filled into the gap between the outer sleeve 6 and the inner sleeve 5 to form an air pressure chamber 13. The spring pressure rods 10 are equidistantly distributed around the center of the upper and lower disc plates 8 with the same area. The diameter of the disc plate 8 is larger than the diameter of the locking nut 3 and the maximum diameter of the outer sleeve 6.

[0018] In actual use, according to Figure 1 The structure shown installs the pressure-releasing locking ring structure at the exposed end of the anchor rod 1, wherein the pressure-releasing kit increases the resistance to the stress of the surrounding rock in different directions around the anchor rod 1. The stress acts directly on the rod body of the spring pressure rod 10, so that the spring pressure rod 10 bends to the outside position and is blocked by the limit ring 9, forming a reverse resistance and a pressure-releasing stroke, thereby alleviating the damage of the surrounding rock stress to the anchor rod 1 or the anchor cable body, so that the anchor rod 1 or the anchor cable body maintains the original preload force; by providing the locking kit, when the axial stress of the anchor rod 1 suddenly increases, the inner sleeve 5 is pressed into the outer sleeve 6, and the internal air pressure chamber 13 cooperates with the reaction force push rods 11 around it to help the anchor rod 1 buffer and dissipate energy, thereby reducing the breakage of the anchor rod 1. During the process, the locking sleeve 4 is used to apply pressure inward to prevent the outer sleeve 6 from swelling and cracking, thereby improving safety.

[0019] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pressure-releasing locking ring for coal mine support, comprising an anchor rod, an anchor rod tray and a locking nut, wherein the anchor rod tray is in close contact with the support surface, and the exposed end of the anchor rod is screwed into the locking nut for fixing, characterized in that: A locking kit and a pressure-releasing kit are arranged in sequence from top to bottom between the locking nut and the anchor tray. The locking kit includes an outer sleeve and an inner sleeve in the shape of a trapezoidal cone, which are sleeved on the anchor rod. The narrower end of the inner sleeve is inserted into the wider end of the outer sleeve. The contact position between the outer sleeve and the anchor tray and the contact position between the outer sleeve and the inner sleeve are both sleeved with sealing rings. The outer half of the outer sleeve is wrapped with a locking sleeve. A plurality of reaction force push rods are distributed equidistantly around the locking sleeve. The pressure-releasing kit includes There are two upper and lower disc plates with the same area, wherein the upper disc plate is pressed against the inner sleeve and is fixed with a limiting ring by a number of connecting rods distributed equidistantly around it; a number of spring pressure rods distributed in a circle are arranged between the upper and lower disc plates with the same area, wherein a locking nut is tightened under the lower disc plate; the reaction force push rod is arc-shaped, one end of which is welded and fixed to the outer side surface of the locking sleeve and the arc-shaped top surface is pressed against the supporting surface; compressed air is filled into the gap between the outer sleeve and the inner sleeve to form an air pressure chamber.

2. The pressure-releasing locking ring for coal mine support according to claim 1, characterized in that: The spring pressure rods are equidistantly distributed around the centers of the upper and lower disc plates with the same areas.

3. The pressure-releasing locking ring for coal mine support according to claim 1, characterized in that: The diameter of the disc plate is larger than the diameter of the locking nut and the maximum diameter of the outer sleeve.

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