Coal roadway surrounding rock internal displacement monitoring system and installation method

Abstract

The invention discloses a coal roadway surrounding rock internal displacement monitoring system and an installation method.The coal roadway surrounding rock internal displacement monitoring system comprises a multi-point displacement meter, an installation mechanism, a transmission mechanism and a monitoring substation, the multi-point displacement meter is provided with an electronic bin, a flexible rod and a plurality of magnetic rings, and each magnetic ring corresponds to a displacement measuring point in a monitoring hole; the mounting mechanism comprises a mounting pipe, a guide rod and a mounting rod, a plurality of guide holes are formed in the mounting pipe, the first end of the guide rod is pivotally connected with the mounting rod, the second end of the guide rod can penetrate through the guide holes to abut against the fixing pieces, the fixing pieces correspond to the magnetic rings one to one, and the fixing pieces are connected with the magnetic rings; the electronic bin and a metal net on a roadway top plate are fixed through the fixing piece, and the two ends of the power supply wire are connected with the power source and the electronic bin respectively. The coal roadway surrounding rock internal displacement monitoring system and the installation method provided by the invention have the advantages of wide measurement positions, high detection precision and real-time feedback of monitoring results.

Description

Technical Field

[0001] The invention relates to the technical field of underground mine pressure monitoring, and in particular to a coal tunnel surrounding rock internal displacement monitoring system and an installation method. Background Art

[0002] During the coal mining process, the deformation and fracture of coal rock can easily form a large number of cracks, which may cause the coal roadway roof to sink or even collapse, and easily cause coal mine safety accidents. Therefore, it is necessary to monitor the roof separation of coal mine tunnels. The commonly used roof separation monitoring instrument is the mine pressure roof separation monitor, which has only two monitoring base points. The coal roadway roof conditions are complex, and the monitoring results at the two positions cannot reflect the actual roof separation. Since the monitoring position has only deep and shallow base points, it is impossible to accurately reflect the relative displacement inside the coal rock. When monitoring the coal rock fracture zone, the detection accuracy may be low, resulting in safety accidents. At the same time, the monitoring equipment is manually observed by workers, and the roof separation cannot be observed in time, causing safety accidents. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems: poor monitoring accuracy cannot reflect the real situation, and manual observation is not timely. The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention proposes a coal tunnel surrounding rock internal displacement monitoring system and installation method, which has the advantages of wide measurement position, high detection accuracy, and real-time feedback of monitoring results.

[0004] According to the coal tunnel surrounding rock internal displacement monitoring system of the embodiment of the present invention, the coal tunnel surrounding rock internal displacement monitoring system includes a multi-point displacement meter, a mounting mechanism, a transmission mechanism and a monitoring substation, the multi-point displacement meter has an electronic bin, a flexible rod and a plurality of magnetic rings, each magnetic ring corresponds to a displacement measuring point in the monitoring hole, the mounting mechanism includes a mounting tube, a guide rod and a mounting rod, a plurality of guide holes are arranged on the mounting tube, the guide holes correspond to the magnetic rings one by one, the first end of the guide rod is pivotally connected to the mounting rod, the second end of the guide rod can pass through the guide hole and abut against the fixing part, the fixing part corresponds to the magnetic ring one by one, the fixing part is connected to the magnetic ring, the transmission structure includes a power supply wire, a power supply and a restraint, the restraint fixes the electronic bin to the metal mesh on the tunnel roof, the two ends of the power supply wire are respectively connected to the power supply and the electronic bin, the monitoring substation collects the displacement data of the multi-point displacement meter and transmits it to the monitoring main station.

[0005] The coal tunnel surrounding rock internal displacement monitoring system according to the embodiment of the present invention has the advantages of wide measurement position, high detection accuracy, and real-time feedback of monitoring results. The present application has the following advantages: it can save manpower, collect data in real time, and the collected data is more complete and accurate, so that the result analysis is more reliable.

[0006] In some embodiments, an auxiliary ball head is disposed at the first end of the mounting rod, and the auxiliary ball head is used to reduce the resistance between the mounting rod and the inner wall of the monitoring hole.

[0007] In some embodiments, the mounting rod includes a plurality of sections of rigid tubes, and the rigid tubes are connected to adjacent rigid tubes.

[0008] In some embodiments, a buckle is disposed on the mounting rod, and the buckle is pivotally connected to the guide rod.

[0009] In some embodiments, the snap-fit ​​component includes a connecting shaft and a connecting plate, the two connecting plates are connected to the outer wall of the mounting rod, the two ends of the connecting shaft are respectively connected to the two connecting plates, the first end of the guide rod has a hole, and the connecting shaft passes through the hole at the first end of the guide rod to enable the guide rod to rotate relative to the connecting shaft.

[0010] In some embodiments, the fixing member has a plurality of claws, which extend toward the inner wall of the monitoring hole and abut against the inner wall of the monitoring hole to fix the magnetic ring.

[0011] In some embodiments, the guide holes are arranged at equal intervals, and the magnetic ring and the fixing member are both arranged on a side of the guide holes adjacent to the first end of the mounting tube.

[0012] According to the method for installing a coal tunnel surrounding rock internal displacement monitoring system according to an embodiment of the present invention, the method for installing a coal tunnel surrounding rock internal displacement monitoring system comprises the following steps:

[0013] According to the multiple displacement measuring points in the monitoring hole, guide holes are processed on the mounting tube, and the magnetic ring and the fixing piece are sleeved on the side of the guide hole adjacent to the first end of the mounting tube;

[0014] Insert the mounting rod into the mounting tube from the first end of the mounting tube, move the guide rod on the mounting rod closer to the mounting rod, the first end of the guide rod enters the mounting tube first, after the mounting rod enters the target position in the mounting tube, rotate the mounting rod so that the second end of the guide rod is aligned with the guide hole, move the mounting rod so that the second end of the guide rod passes through the guide hole and abuts against the fixing member;

[0015] Push the mounting tube, magnetic ring, fixing piece and mounting rod into the monitoring hole, with the first end of the mounting tube entering the monitoring hole first. After the mounting tube is completely in the monitoring hole, push the mounting rod toward the first end of the mounting tube so that the guide rod pushes the fixing piece to move and the claw of the fixing piece opens and contacts the inner wall of the monitoring hole.

[0016] Move the mounting rod toward the second end of the mounting tube, move the guide rod toward the mounting rod and detach from the fixing piece, take the mounting rod and the mounting tube out of the monitoring hole in turn, and insert the flexible rod and the electronic compartment of the multi-point displacement meter into the monitoring hole.

[0017] In some embodiments, after the mounting tube is rotated until its extension direction coincides with the horizontal direction, guide holes are processed on the mounting tube, and the magnetic rings and the fixing members correspond to the guide holes one by one.

[0018] In some embodiments, the electronic warehouse is fixed to the metal mesh of the tunnel roof, and the electronic warehouse is connected to the power source through the power supply wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the internal displacement monitoring system of surrounding rock of coal roadway according to an embodiment of the present invention.

[0020] Figure 2 It is a partially enlarged schematic diagram of the internal displacement monitoring system of surrounding rock of a coal roadway according to an embodiment of the present invention.

[0021] Figure 3 1 is a schematic structural diagram of a guide rod of a coal roadway surrounding rock internal displacement monitoring system according to another embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the use status of the internal displacement monitoring system of surrounding rock in a coal roadway according to an embodiment of the present invention.

[0023] Figure 5 1 is a schematic structural diagram of a buckle component of a coal tunnel surrounding rock internal displacement monitoring system according to an embodiment of the present invention.

[0024] Figure numerals: 1. Monitoring hole; 2. Auxiliary ball head; 3. Mounting rod; 4. Magnetic ring; 5. Fixing part; 6. Metal mesh; 7. Constraint; 8. Flexible rod; 9. Electric wire; 10. Power supply; 11. Monitoring substation; 12. Guide rod; 121. Connecting plate; 122. Connecting shaft; 123. Sliding groove; 124. Sliding column; 13. Mounting tube. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] According to the coal tunnel surrounding rock internal displacement monitoring system of the embodiment of the present invention, the coal tunnel surrounding rock internal displacement monitoring system includes a multi-point displacement meter, a mounting mechanism, a transmission mechanism and a monitoring substation 11, the multi-point displacement meter has an electronic bin, a flexible rod 8 and a plurality of magnetic rings 4, each magnetic ring 4 corresponds to a displacement measuring point in the monitoring hole 1, the mounting mechanism includes a mounting tube, a guide rod 12 and a mounting rod 3, a plurality of guide holes are arranged on the mounting tube, the guide holes correspond to the magnetic rings 4 one by one, the first end of the guide rod 12 is pivotally connected to the mounting rod 3, the second end of the guide rod 12 can pass through the guide hole to abut against the fixing member 5, the fixing member 5 corresponds to the magnetic ring 4 one by one, and the fixing member 5 is connected to the magnetic ring 4, the transmission structure includes a power supply wire 9, a power supply 10 and a constraint 7, the constraint 7 fixes the electronic bin to the metal mesh 6 on the tunnel roof, the two ends of the power supply wire 9 are respectively connected to the power supply 10 and the electronic bin, and the monitoring substation 11 collects the displacement data of the multi-point displacement meter and transmits it to the monitoring main station. The installation mechanism is used to complete the installation of the multi-point displacement meter in the monitoring hole 1, the transmission mechanism is used to supply power to the multi-point displacement meter to ensure the operation of the multi-point displacement meter, the monitoring substation 11 is connected to the multi-point displacement meter to receive displacement data to complete the real-time feedback of the monitoring results, and the main detection station located on the ground can deal with it in time according to the monitoring results. The multi-point displacement meter in the monitoring hole 1 is a magnetostrictive displacement meter, which monitors the displacement change of the inner wall of the monitoring hole 1 by detecting the position of the magnetic ring 4 stuck on the inner wall of the monitoring hole 1. The power supply voltage of the power supply 10 is 24V, and the operating current is about 50mA. The monitoring substation 11 is a switch with a 10M dual-port Ethernet switching interface and a monitoring substation 11 containing a high-performance single-chip microcomputer and memory. There is also a monitoring main station and a data processing system on the ground, which can analyze and process the collected signals, and give an evaluation and corresponding treatment measures for the surrounding rock conditions in combination with the actual situation of the coal mine. The monitoring hole 1 can select different drilling diameters according to geological conditions, such as diameters of 42mm and 32mm. The monitoring holes 1 are arranged every 10 to 100 meters in the tunnel and can be adjusted according to the geological conditions of the coal tunnel.

[0027] The coal roadway surrounding rock internal displacement monitoring system according to the embodiment of the present invention has the advantages of wide measurement positions, high detection accuracy, and real-time feedback of monitoring results.

[0028] In some embodiments, an auxiliary ball head 2 is disposed at the first end of the mounting rod 3 , and the auxiliary ball head 2 is used to reduce the resistance between the mounting rod 3 and the inner wall of the monitoring hole 1 .

[0029] Specifically, the auxiliary ball head 2 can reduce resistance by having the spherical surface in contact with the inner wall of the monitoring hole 1. The auxiliary ball head 2 can allow the mounting rod 3 to smoothly enter the monitoring hole 1. It can be understood that the auxiliary ball head 2 can be in the shape of a sphere, a hemisphere, etc. The auxiliary ball head 2 only needs to have a spherical surface in contact with the hole wall to achieve the guiding effect on the mounting rod 3.

[0030] In some embodiments, the mounting rod 3 includes multiple sections of hard tubes, and the hard tubes are connected to adjacent hard tubes.

[0031] Specifically, the mounting rod 3 is assembled from multiple sections of hard pipes, which may be hard stainless steel pipes. The multiple sections of hard pipes may be threadedly connected and fixed to each other, so that the mounting rod 3 can be adapted to monitoring holes 1 of different lengths. The length of the mounting rod 3 can be changed by simply increasing or decreasing the number of hard pipes.

[0032] In some embodiments, a buckle is disposed on the mounting rod 3 , and the buckle is pivotally connected to the guide rod 12 .

[0033] Specifically, the buckles are located on both sides of the mounting rod 3 and are symmetrically arranged about the mounting rod 3. The buckles are rotatably connected to the guide rod 12 so that the guide rod 12 rotates relatively with the buckles as the center. Optionally, a sliding groove 123 is provided on the second end of the guide rod 12, and a sliding column 124 is provided in the guide hole of the mounting tube. The sliding column 124 slides in the sliding groove 123. As the guide rod 12 moves relative to the mounting tube, the sliding column 124 pushes the second end of the guide rod 12 to rotate relatively. The sliding groove 123 is adjacent to the second end of the guide rod 12. The opening on one side of the sliding groove 123 allows the sliding column 124 to enter and disengage.

[0034] In some embodiments, the snap-fitting member includes a connecting shaft 122 and a connecting plate 121, the two connecting plates 121 are connected to the outer wall of the mounting rod 3, the two ends of the connecting shaft 122 are respectively connected to the two connecting plates 121, the first end of the guide rod 12 has a hole, and the connecting shaft 122 passes through the hole at the first end of the guide rod 12 so that the guide rod 12 can rotate relative to the connecting shaft 122.

[0035] Specifically, the connecting shaft 122 is arranged between the two connecting plates 121. The two connecting plates 121 extend toward the wall of the monitoring hole 1 to shorten the length of the guide rod 12. The opening on the first end of the guide rod 12 is used to match the connecting shaft 122. The guide rod 12 rotates around the connecting shaft 122. The buckle facilitates the installation rod 3 to connect the guide rod 12.

[0036] In some embodiments, the fixing member 5 has a plurality of claws, which extend toward the inner wall of the monitoring hole 1 and abut against the inner wall of the monitoring hole 1 to fix the magnetic ring 4 .

[0037] Specifically, the first side of the fixing member 5 abuts against the magnetic ring 4, and a plurality of claws are arranged on the second side of the fixing member 5. When the fixing member 5 moves in the monitoring hole 1, the first side of the fixing member 5 enters first, and the claws abut against and slide against the wall of the monitoring hole 1. When the fixing member 5 moves in the opposite direction, the claws prevent the fixing member 5 from moving, so that the fixing member 5 is fixed in the monitoring hole 1 to complete the positioning and support of the magnetic ring 4.

[0038] In some embodiments, the guide holes are arranged at equal intervals, and the magnetic ring 4 and the fixing member 5 are both arranged on one side of the guide hole adjacent to the first end of the mounting tube.

[0039] Specifically, the guide holes are arranged at equal intervals on the mounting tube, and the guide holes can extend a certain distance along the axial direction of the mounting tube so that the second end of the guide rod 12 can move in the guide hole. The side of the guide hole adjacent to the first end of the mounting tube first enters the monitoring hole 1, and the magnetic ring 4 and the fixing member 5 are arranged in sequence so that the magnetic ring 4 and the fixing member 5 can enter first. When the mounting rod 3 moves relative to the mounting tube so that the second end of the guide rod 12 extends out of the guide hole, it can abut against the fixing member 5 to complete the support and fixation of the fixing member 5.

[0040] In some embodiments, the multi-point displacement meter and the monitoring substation 11 are designed to be explosion-proof, which is safer and easier to promote in coal mines.

[0041] According to the method for installing a coal tunnel surrounding rock internal displacement monitoring system according to an embodiment of the present invention, the method for installing a coal tunnel surrounding rock internal displacement monitoring system comprises the following steps:

[0042] According to the multiple displacement measuring points in the monitoring hole 1, guide holes are processed on the mounting tube, and the magnetic ring 4 and the fixing member 5 are sleeved on the side of the guide hole adjacent to the first end of the mounting tube;

[0043] Insert the mounting rod 3 into the mounting tube from the first end of the mounting tube, move the guide rod 12 on the mounting rod 3 closer to the mounting rod 3, the first end of the guide rod 12 enters the mounting tube first, after the mounting rod 3 enters the target position in the mounting tube, rotate the mounting rod 3 so that the second end of the guide rod 12 is aligned with the guide hole, move the mounting rod 3 so that the second end of the guide rod 12 passes through the guide hole and abuts against the fixing member 5;

[0044] Push the mounting tube, magnetic ring 4, fixing member 5 and mounting rod 3 into the monitoring hole 1. The first end of the mounting tube enters the monitoring hole 1 first. After the mounting tube completely enters the monitoring hole 1, push the mounting rod 3 toward the first end of the mounting tube so that the guide rod 12 pushes the fixing member 5 to move and the claws of the fixing member 5 open and abut against the inner wall of the monitoring hole 1.

[0045] Move the mounting rod 3 toward the second end of the mounting tube, the guide rod 12 moves toward the mounting rod 3 and disengages from the fixing member 5, remove the mounting rod 3 and the mounting tube from the monitoring hole 1 in turn, and insert the flexible rod 8 and the electronic compartment of the multi-point displacement meter into the monitoring hole 1.

[0046] The technical advantages of the installation method of the coal roadway surrounding rock internal displacement monitoring system according to the embodiment of the present invention are the same as the technical advantages of the above-mentioned coal roadway surrounding rock internal displacement monitoring system, which will not be repeated here.

[0047] In some embodiments, after the mounting tube is rotated until its extension direction coincides with the horizontal direction, guide holes are processed on the mounting tube, and the magnetic ring 4 and the fixing member 5 correspond to the guide holes one by one.

[0048] Specifically, laying the installation tube flat facilitates installation of the magnetic ring 4 and the fixing member 5 , and prevents the magnetic ring 4 and the fixing member 5 from moving relative to the installation tube.

[0049] In some embodiments, the electronic warehouse is fixed to the metal mesh 6 of the tunnel roof, and the electronic warehouse is connected to the power source 10 through the power supply wire 9.

[0050] Specifically, the metal mesh 6 is laid on the roof of the coal tunnel for auxiliary support, and can fix the sensor and the power supply 10. The restraint member 7 uses a stainless steel wire rope to fix the electronic warehouse and the metal mesh 6 to prevent the multi-point displacement meter from falling and injuring people.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A coal tunnel surrounding rock internal displacement monitoring system, characterized in that: include: A multi-point displacement meter, the multi-point displacement meter having an electronic compartment, a flexible rod and a plurality of magnetic rings, each of the magnetic rings corresponding to a displacement measuring point in the monitoring hole; A mounting mechanism, the mounting mechanism comprising a mounting tube, a guide rod and a mounting rod, the mounting tube is provided with a plurality of guide holes, the guide holes correspond to the magnetic rings one by one, the first end of the guide rod is pivotally connected to the mounting rod, the second end of the guide rod can pass through the guide hole to abut against a fixing member, the fixing member corresponds to the magnetic rings one by one, and the fixing member is connected to the magnetic ring; A transmission structure, the transmission structure comprising a power supply wire, a power source and a restraint member, the restraint member fixes the electronic bin to the metal mesh on the tunnel roof, and two ends of the power supply wire are respectively connected to the power source and the electronic bin; The monitoring substation collects displacement data of the multi-point displacement meter and transmits the data to the monitoring main station.

2. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 1, characterized in that: An auxiliary ball head is arranged at the first end of the mounting rod, and the auxiliary ball head is used to reduce the resistance between the mounting rod and the inner wall of the monitoring hole.

3. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 1 is characterized in that: The mounting rod comprises a plurality of hard pipes, and the hard pipes are connected to adjacent hard pipes.

4. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 1, characterized in that: A buckle is arranged on the installation rod, and the buckle is pivotally connected to the guide rod.

5. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 4 is characterized in that: The fastener includes a connecting shaft and a connecting plate, the two connecting plates are connected to the outer wall of the mounting rod, the two ends of the connecting shaft are respectively connected to the two connecting plates, the first end of the guide rod has a hole, and the connecting shaft passes through the hole at the first end of the guide rod to enable the guide rod to rotate relative to the connecting shaft.

6. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 1, characterized in that: The fixing member has a plurality of claws, and the claws extend toward the inner wall of the monitoring hole and abut against the inner wall of the monitoring hole to fix the magnetic ring.

7. The internal displacement monitoring system of surrounding rock of coal roadway according to claim 1, characterized in that: The guide holes are arranged at equal intervals, and the magnetic ring and the fixing member are both arranged on one side of the guide hole adjacent to the first end of the mounting tube.

8. A method for installing a coal tunnel surrounding rock internal displacement monitoring system, using the coal tunnel surrounding rock internal displacement monitoring system as claimed in claim 1 to perform displacement monitoring, characterized in that: The following steps are involved: According to the multiple displacement measuring points in the monitoring hole, guide holes are processed on the mounting tube, and the magnetic ring and the fixing piece are sleeved on the side of the guide hole adjacent to the first end of the mounting tube; Insert the mounting rod into the mounting tube from the first end of the mounting tube, move the guide rod on the mounting rod closer to the mounting rod, the first end of the guide rod first enters the mounting tube, after the mounting rod enters the target position in the mounting tube, rotate the mounting rod so that the second end of the guide rod is aligned with the guide hole, move the mounting rod so that the second end of the guide rod passes through the guide hole and abuts against the fixing member; Push the mounting tube, the magnetic ring, the fixing member and the mounting rod into the monitoring hole, with the first end of the mounting tube entering the monitoring hole first. After the mounting tube completely enters the monitoring hole, push the mounting rod toward the first end of the mounting tube so that the guide rod pushes the fixing member to move and the claw of the fixing member opens and abuts against the inner wall of the monitoring hole; Move the mounting rod toward the second end of the mounting tube, move the guide rod toward the mounting rod and detach from the fixing member, remove the mounting rod and the mounting tube from the monitoring hole in turn, and insert the flexible rod and the electronic compartment of the multi-point displacement meter into the monitoring hole.

9. The method for installing the internal displacement monitoring system of surrounding rock in a coal roadway according to claim 8, characterized in that: After the mounting tube is rotated until its extension direction coincides with the horizontal direction, the guide hole is processed on the mounting tube, and the magnetic ring and the fixing member correspond to the guide hole one by one.

10. The method for installing the internal displacement monitoring system of surrounding rock of a coal roadway according to claim 8, characterized in that: The electronic warehouse is fixed to the metal mesh of the tunnel roof, and the electronic warehouse is connected to the power supply through the power supply wire.

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