Drawing monitoring intelligent sensing anchor rod and using method

Abstract

The invention discloses a drawing monitoring intelligent sensing anchor rod and a using method, and belongs to the technical field of coal mining. The anchor rod comprises an anchor rod body, a rod body center reserved channel, a nut, a tray, a specially-made plug-in mounting rod body, a piezoelectric pressure sensor and a current acquisition card. During use, the specially-made plug-in mounting rod body connected with the spring is mounted in a channel in the center of the anchor rod, resin cartridges are pasted to the disc end of the specially-made plug-in mounting rod body and the anchor rod body, when the anchor rod is conveyed to a drilling end point, the disc end is stressed to enable the spring to be compressed, and the tail pressure sensor senses pressure and outputs current; a current signal is transmitted to a monitoring device through a current acquisition card, and a drawing force with higher strength can be formed due to the acting force of a spring, so that high-strength effective support is formed, roadway surrounding rocks are protected from being damaged, the stability of a roadway is ensured, the safety mining efficiency and quality of a coal mine are improved, accident risks are reduced, and the life and property safety of workers is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to an intelligent sensing anchor rod capable of monitoring the pull-out force of an anchor rod in real time and effectively controlling the pull-out force of surrounding rocks, and a method for using the anchor rod. Background Art

[0002] 1. Safety needs: Coal mines usually have complex geological structures and diverse rock formations. It is easy to encounter rock instability or rock pressure problems during mining. Using anchors to reinforce surrounding rocks can effectively reduce the displacement and deformation of rock formations, thereby improving the safety of the working face. Monitoring the pull-out force of anchors can timely detect changes in surrounding rock stability, warn of possible dangers, and help mine managers make safety decisions.

[0003] 2. Facility structure needs: Anchors used in coal mines are not only used for surrounding rock support, but are also often used to support and reinforce working faces, tunnels and other structures. Monitoring the pull-out force of anchors can evaluate the working status of the anchor system, ensure that it works effectively within the design life, and prevent structural damage or collapse accidents caused by anchor failure.

[0004] 3. Production efficiency needs: By real-time monitoring of the pull-out force of the anchor bolt, mine managers can understand the actual conditions of the surrounding rock and support structure, formulate support plans and adjust the mining schedule in a targeted manner, and improve the production efficiency and resource utilization of coal mines.

[0005] As the depth of coal mining increases, even medium-hard or higher rock masses may exhibit soft rock characteristics in high-in-situ stress environments. Especially in the southwest region, water-expanding soft rocks may be encountered. These rock formations often exhibit continuous deformation characteristics after excavation and are difficult to stabilize. Even after stabilization, they will continue to deform if disturbed.

[0006] These challenges have put forward severe requirements on the support system. The current monitoring methods mainly focus on the exposed part of the anchor rod, but because the surrounding rock is in a closed environment, it is impossible to directly monitor the stress state of the anchor rod. Therefore, it is difficult for the work unit to grasp the actual working state of the anchor rod in time, accurately evaluate the support effect and surrounding rock deformation, and make necessary adjustments. Summary of the invention

[0007] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art and to solve the problem of pull-out force monitoring of tunnel support in coal rock environments. It provides a pull-out monitoring intelligent sensing anchor and usage method that is simple in structure, easy to use, and ensures timely and effective support for tunnel monitoring and stability.

[0008] Technical solution: The present invention provides an intelligent sensing anchor rod for pull-out monitoring, comprising an anchor rod body, a piezoelectric pressure sensor, and a current acquisition card, wherein the anchor rod body is a hollow rod body; a truncated cone-shaped tray for protecting a hole is mounted on the exposed side of the tail of the anchor rod body, a threaded section is provided on the anchor rod body outside the truncated cone-shaped tray, a nut for fixing the truncated cone-shaped tray is provided on the threaded section, and the piezoelectric pressure sensor is arranged at the end of the anchor rod body and connected to the current acquisition card via a signal line; a special plug-in rod body is provided at the front part of the anchor rod body entering the borehole, a spring is provided at one end of the special plug-in rod body that is plugged into the anchor rod body, and a disc is provided at the end facing the borehole; when the plug-in rod body enters the borehole with the anchor rod body and reaches the bottom, the disc at the end of the plug-in rod body will abut against the bottom of the borehole, thereby compressing the spring. After the anchor rod body is installed, the compressed spring is reset to generate a reaction force to enhance the anchoring effect of the anchor rod.

[0009] The surface of the disc at one end of the specially made insertion rod body entering the drill hole is pasted with a resin medicine roll.

[0010] The diameter of the disc at one end of the specially made inserted rod body entering the drill hole is the same as the diameter of the drill hole.

[0011] The truncated cone-shaped tray is in a bowl shape.

[0012] The nut is a pentagonal nut.

[0013] The piezoelectric pressure sensor is a 6211-type piezoelectric pressure sensor that is threadedly connected to the anchor body.

[0014] The current acquisition card is a current acquisition card USB3140A that can sense current changes.

[0015] A method for using the above-mentioned pull-out monitoring intelligent sensing anchor rod comprises the following steps:

[0016] a. Drill holes on the construction surface according to the set working surface, and withdraw the drill after completing the hole;

[0017] b. Paste the resin medicine roll on the disc end surface of the special plug-in rod body and the surface of the anchor rod body;

[0018] c. Then screw the anchor body with the resin roll pasted on the surface into the drilled hole, and make sure that the resin roll is broken during the screwing process and the spring of the special plug-in rod body is compressed, so that the end surface of the special plug-in rod body disc is flush with the tail of the anchor rod;

[0019] d. Then quickly install the tray and nut on the hole, wait for the resin to cure for 10 minutes, and then turn on the current acquisition card;

[0020] e. The piezoelectric pressure sensor generates charge changes when it is under pressure, which are amplified and recorded by the current acquisition card USB3140A that can sense current changes. The pull-out force of the anchor rod is monitored by monitoring the current changes of the current acquisition card USB3140A. At the same time, the reaction force formed by the spring strengthens the anchoring effect of the anchor rod, forming a dual effect of strengthening anchoring and monitoring pull-out force.

[0021] Beneficial effect: The present invention aims to solve the problem of pull-out force monitoring of tunnel support in coal-rock environment. Due to the adoption of the above technical solution, by drilling a hole on the construction surface, a resin roll is pasted on the surface of the special plug-in rod disc end and the surface of the anchor rod body, and then the anchor rod body is screwed into the drill hole. During the screwing process, the resin roll is broken and the spring of the special plug-in rod body is compressed, so that the surface of the special plug-in rod disc end is flush with the tail of the anchor rod. Then the tray and nut are quickly installed at the hole mouth, and the current acquisition card is turned on after waiting for the resin to solidify for 10 minutes; the current change generated by the pressure on the piezoelectric pressure sensor is monitored, and the reaction force formed by the spring strengthens the anchoring effect of the anchor rod, forming a dual effect of strengthening anchoring and pull-out force monitoring, which can effectively monitor the change of the pull-out force of the anchor rod, and at the same time can protect the surface of the surrounding rock of the tunnel from damage and ensure the stability of the tunnel. It can improve the efficiency and quality of safe mining in coal mines, reduce the risk of accidents, and protect the lives and property of workers. The invention has the advantages of simple structure, convenient implementation, good monitoring effect and anchoring effect, high support strength, and can ensure timely monitoring and effective support of the tunnel, thereby ensuring the stability of the tunnel. The invention has wide practicability in the technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a pull-out monitoring intelligent sensing anchor rod of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the special plug-in rod body of the present invention.

[0024] Figure 3 It is a schematic diagram of the axial structure of the present invention.

[0025] Figure 4 It is a schematic diagram of the longitudinal structure of the present invention.

[0026] In the figure: 1-anchor body; 2-nut; 3-tray; 4-special plug-in rod body; 5-piezoelectric stress sensor; 6-current acquisition card. DETAILED DESCRIPTION

[0027] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings:

[0028] The present invention discloses an intelligent sensing anchor rod for pull-out monitoring, comprising an anchor rod body (1), a piezoelectric pressure sensor (5), and a current acquisition card (6). The anchor rod body (1) is a hollow rod body; a truncated cone-shaped tray (3) with a hole protection is mounted on the exposed side of the tail of the anchor rod body (1); a threaded section is provided on the anchor rod body (1) outside the truncated cone-shaped tray (3); a nut (2) for fixing the truncated cone-shaped tray (3) is provided on the threaded section; the truncated cone-shaped tray (3) is bowl-shaped, and the nut (2) is a pentagonal nut. The piezoelectric pressure sensor (5) is arranged at the end of the anchor rod body (1) and is connected to the current acquisition card (6) via a signal line; the piezoelectric pressure sensor (5) is a 6211-type piezoelectric pressure sensor threadedly connected to the anchor rod body (1); and the current acquisition card (6) is a current acquisition card USB3140A that can sense current changes. A special plug-in rod (4) is provided at the front of the anchor rod body (1) entering the borehole. The end of the special plug-in rod (4) plugged with the anchor rod body (1) is provided with a spring (41), and the end facing the borehole is provided with a disc (42); the surface of the disc (42) at the end of the special plug-in rod (4) entering the borehole is pasted with a resin roll; the diameter of the disc (42) at the end of the special plug-in rod (4) entering the borehole is the same as the diameter of the borehole. When the plug-in rod (4) enters the borehole with the anchor rod body (1) and reaches the bottom, the disc (42) at the end of the plug-in rod (4) will abut against the bottom of the borehole, thereby compressing the spring. After the anchor rod body (1) is installed, the compressed spring returns to generate a reaction force to strengthen the anchoring effect of the anchor rod.

[0029] The method for using the pull-out monitoring intelligent sensing anchor rod of the present invention comprises the following steps:

[0030] a. Drill holes on the construction surface according to the set working surface, and withdraw the drill after completing the hole;

[0031] b. Paste a resin medicine roll on the surface of the disc end surface (42) of the specially made plug-in rod body (4) and the surface of the anchor rod body (1);

[0032] c. Then, the anchor body (1) with the resin roll pasted on the surface is screwed into the drill hole, and the resin roll is broken during the screwing process to ensure that the spring (41) of the special plug-in rod body (4) is compressed so that the disc end surface (42) of the special plug-in rod body (4) is flush with the tail of the anchor rod;

[0033] d. Then quickly install the tray (4) and nut (3) in the hole, wait for the resin to cure for 10 minutes, and then turn on the current acquisition card (6);

[0034] e. The piezoelectric pressure sensor (5) generates charge changes when it is under pressure, which are amplified and recorded by the current acquisition card USB3140A that can sense current changes. By monitoring the current changes of the current acquisition card USB3140A, the pull-out force of the anchor rod can be monitored. At the same time, the reaction force formed by the spring strengthens the anchoring effect of the anchor rod, forming a dual effect of strengthening anchoring and monitoring pull-out force.

Claims

1. A pullout monitoring intelligent sensing anchor, comprising an anchor body (1), a piezoelectric pressure sensor (5), and a current acquisition card (6), characterized in that: The anchor rod body (1) is a hollow rod body; a truncated cone-shaped tray (3) with a hole protection is mounted on the exposed side of the tail of the anchor rod body (1); a threaded section is provided on the anchor rod body (1) outside the truncated cone-shaped tray (3); a nut (2) for fixing the truncated cone-shaped tray (3) is provided on the threaded section; the piezoelectric pressure sensor (5) is arranged at the end of the anchor rod body (1) and is connected to the current acquisition card (6) via a signal line; a special pressure sensor is provided at the front of the anchor rod body (1) entering the borehole. The plug-in rod body (4) is specially made, wherein one end of the plug-in rod body (4) plugged into the anchor rod body (1) is provided with a spring (41), and the other end facing the borehole is provided with a disc (42); when the plug-in rod body (4) enters the borehole along with the anchor rod body (1) and reaches the bottom, the disc (42) at the end of the plug-in rod body (4) will abut against the bottom of the borehole, thereby compressing the spring. After the anchor rod body (1) is installed, the compressed spring returns to its original position to generate a reaction force, thereby strengthening the anchoring effect of the anchor rod.

2. According to claim 1, the pull-out monitoring intelligent sensing anchor rod is characterized in that: A resin roll is pasted on the surface of the disc (42) at one end of the specially made insertion rod body (4) that enters the drill hole.

3. According to claim 1, the pull-out monitoring intelligent sensing anchor rod is characterized in that: The diameter of the disc (42) at one end of the specially made inserted rod body (4) entering the drill hole is the same as the diameter of the drill hole.

4. The pull-out monitoring intelligent sensing anchor rod according to claim 1 is characterized in that: The truncated cone-shaped tray (3) is in a bowl shape.

5. The pull-out monitoring intelligent sensing anchor rod according to claim 1 is characterized in that: The nut (2) is a pentagonal nut.

6. The pull-out monitoring intelligent sensing anchor rod according to claim 1 is characterized by: The piezoelectric pressure sensor (5) is a 6211-type piezoelectric pressure sensor threadedly connected to the anchor body (1).

7. The pull-out monitoring intelligent sensing anchor rod according to claim 1 is characterized by: The current acquisition card (6) is a current acquisition card USB3140A that can sense current changes.

8. A method for using the pull-out monitoring intelligent sensing anchor rod according to any one of claims 1 to 7, characterized in that: The steps include: a. Drill holes on the construction surface according to the set working surface, and withdraw the drill after completing the hole; b. Paste a resin medicine roll on the surface of the disc end surface (42) of the specially made plug-in rod body (4) and the surface of the anchor rod body (1); c. Then, the anchor body (1) with the resin roll pasted on the surface is screwed into the drill hole, and the resin roll is broken during the screwing process to ensure that the spring (41) of the special plug-in rod body (4) is compressed so that the disc end surface (42) of the special plug-in rod body (4) is flush with the tail of the anchor rod; d. Then quickly install the tray (4) and nut (3) in the hole, wait for the resin to cure for 10 minutes, and then turn on the current acquisition card (6); e. The piezoelectric pressure sensor (5) generates charge changes when it is under pressure, which are amplified and recorded by the current acquisition card USB3140A that can sense current changes. By monitoring the current changes of the current acquisition card USB3140A, the pull-out force of the anchor rod can be monitored. At the same time, the reaction force formed by the spring strengthens the anchoring effect of the anchor rod, forming a dual effect of strengthening anchoring and monitoring pull-out force.

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