Capacitive gate top plate displacement sensor

Abstract

The invention discloses a capacitive gate roof displacement sensor, and belongs to the technical field of coal mine roof monitoring, the capacitive gate roof displacement sensor comprises an anchoring part and a measuring part, the anchoring part comprises a first anchoring part and a second anchoring part, the first anchoring part is used for being anchored at the preset depth of a roadway roof drill hole, and the second anchoring part is used for being anchored at the orifice position of the roadway roof drill hole; the measuring part comprises a capacitive grating sensor, the capacitive grating sensor comprises a grating ruler assembly, the grating ruler assembly comprises a fixed grating and a movable grating, the fixed grating is fixedly connected with the first anchoring part, and the movable grating is fixedly connected with the first anchoring part. The capacitive grating sensor is adopted as a core monitoring component, is based on a variable area working principle, is less influenced by voltage fluctuation, is not easy to cause a data fluctuation problem, does not have inherent sliding noise of a rotary potentiometer, and solves the problem of data instability caused by the sliding noise of the rotary potentiometer. The misjudgment layer separation phenomenon of the monitoring system caused by abnormal data is avoided, and the accuracy and reliability of monitoring analysis of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine roof monitoring, in particular to a capacitive grid roof displacement sensor. Background Art

[0002] The instability of the roof of a coal mine roadway often causes roof collapse accidents. The stability of the roof is the core of the stability determination of various roadway surrounding rocks. Timely grasp the delamination of the roadway roof, and through the roadway displacement observation data, the movement of the roadway surrounding rock can be better determined, and the signs of roof instability can be discovered early to avoid roof accidents.

[0003] At present, the roof displacement sensors are mainly installed in the tunnel to monitor the position and amount of the roof separation, which is used to determine the scope of roof damage, identify the stability of the tunnel, and evaluate the existing support of the tunnel. The roof displacement sensors are mainly divided into two categories: mechanical and electronic digital display. Mechanical displacement sensors cannot automatically collect and upload data, and cannot achieve real-time monitoring and online early warning. Special personnel are required to patrol and read the data. Electronic digital display types can automatically collect, store, and upload separation data in real time to achieve real-time online monitoring functions.

[0004] At present, the electronic digital display top plate displacement sensor mainly uses a rotary potentiometer for data acquisition and monitoring. The rotary potentiometer is connected to the anchor claw through a steel wire rope, and the anchor claw is installed in the surrounding rock borehole. The sinking of the tunnel roof increases the distance between the anchor claw anchored above the top plate and the sensor housing, thereby pulling the steel wire. The end of the steel wire is connected to the spring, which is installed on the coaxial roller. The rotation of the roller drives the rotary potentiometer to rotate, so that the output signal of the potentiometer changes. After the amplifier circuit amplifies the signal and A / D conversion, it is collected and processed by the sensor chip and the current top plate displacement value is displayed on the digital tube. However, the rotary potentiometer is captured by the AD acquisition chip through the resistance voltage division method. When changing the resistance value, due to the precision of the potentiometer, motion error and the stability of the power supply voltage, it is easy to cause large fluctuations in the voltage signal acquisition, resulting in data fluctuations. In addition, due to improper distribution of the potentiometer resistance, improper coordination of the rotation system and contact resistance of the potentiometer, when the moving contact moves on the surface of the resistor, in addition to the useful signal, the output end is also accompanied by sliding noise that fluctuates with the signal. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and provide a capacitive grid top plate displacement sensor, which adopts a capacitive grid sensor as a core monitoring component. The capacitive grid sensor is based on a variable area working principle, is less affected by voltage fluctuations, is not prone to data fluctuation problems, and does not have the inherent sliding noise of a rotary potentiometer. It solves the problem of data fluctuations caused by the inherent sliding noise and voltage instability of the rotary potentiometer.

[0006] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a capacitive grid roof displacement sensor, comprising an anchoring part and a measuring part, the anchoring part comprising a first anchor and a second anchor, the first anchor being used to anchor at a preset depth of a hole drilled in the tunnel roof, the second anchor being used to anchor at a hole mouth position of the hole drilled in the tunnel roof, the measuring part comprising a capacitive grid sensor, the capacitive grid sensor comprising a scale assembly, the scale assembly matching the number of the first anchor, the scale assembly comprising a moving grid and a fixed grid, the fixed grid being fixedly connected to the first anchor, and the moving grid being fixedly connected to the second anchor.

[0007] Preferably, the first anchoring member comprises an anchor claw, and the anchor claw is fixedly connected to the fixed grid via a rope.

[0008] Preferably, the fluke comprises an anchor tube and an elastic strip, wherein the elastic strip is arranged on the peripheral wall of the anchor tube in a barb-like shape, and the anchor tube is fixedly connected to the rope.

[0009] Preferably, the second anchoring member includes an anchoring head and an anchoring container, one end of the anchoring head is provided with a connecting groove, the other end of the anchoring head is provided with a sealing hole, the sealing hole is connected with the connecting groove, the anchoring container is provided with a connecting port connected with the connecting groove, the anchoring container is anchored at the hole mouth position of the hole drilled in the tunnel roof, the capacitive fence sensor is installed in the anchoring container, the moving fence is fixedly connected with the anchoring container, one end of the rope is connected with the fixed fence, and the other end of the rope passes through the connecting port, the connecting groove and the sealing hole in sequence and is connected with the anchor claw.

[0010] Preferably, a grease groove is installed in the connecting groove, the groove end of the grease groove is connected to the sealing hole, the bottom end of the grease groove is provided with a through hole for the rope to pass through, and the grease groove is filled with grease.

[0011] Preferably, the sealing hole comprises a circular hole section and a conical hole section, the small diameter end of the conical hole section is connected to the circular hole section, the large diameter end of the conical hole section is connected to the connecting groove, a sealing groove is coaxially provided on the circular hole section, and a sealing ring is installed in the sealing groove.

[0012] Preferably, the anchoring container includes a guide tube, a mounting shell, a threaded sleeve and a transparent tube, one end of the transparent tube is closed and the other end is open, the open end of the transparent tube is threadedly connected and communicated with one end of the mounting shell, the other end of the mounting shell is threadedly connected and communicated with one end of the threaded sleeve, the other end of the threaded sleeve is sleeved on one end of the guide tube, and the other end of the guide tube is sleeved on the outside of one end of the anchor head provided with a connecting groove, an elastic fin is provided on the outer wall of the guide tube, and the elastic fin is arranged on the guide tube in a barb shape, the moving grid is installed in the mounting shell, the fixed grid of the capacitive grid sensor is installed on the fixed grid scale, the fixed grid scale is connected to the rope, the fixed grid scale extends into the transparent tube, and the rope passes through the mounting shell, the threaded sleeve and the guide tube in sequence.

[0013] Preferably, a tray, a gasket and a rotating nut are sequentially provided on the threaded sleeve, the tray is close to the guide tube for abutting against the tunnel roof, the gasket is sleeved on the threaded sleeve, and the rotating nut is threadedly connected to the threaded sleeve and close to the mounting shell.

[0014] Preferably, a waterproof edge is provided on the outer wall of the anchor head, an insertion groove is formed between the waterproof edge and the outer wall of the anchor head, and the guide tube is inserted into the insertion groove and fixedly connected.

[0015] Preferably, the mounting shell comprises an upper shell and a lower shell that are detachably connected, the upper shell is provided with an upper threaded opening for threaded connection with the threaded sleeve, the lower shell is provided with a lower threaded opening for threaded connection with the transparent tube, the sensor mainboard of the capacitive barrier sensor is arranged in the lower shell, the power supply / communication interface of the capacitive barrier sensor extends out of the lower shell, and the moving barrier is installed in the upper shell through a moving barrier bracket.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The capacitive grid roof displacement sensor of the present invention adopts a capacitive grid sensor as a core monitoring component. It is a capacitive digital sensor based on a variable area working principle and can measure large displacements. It is less affected by voltage fluctuations, is not prone to data fluctuation problems, and does not have the sliding noise inherent in a rotary potentiometer. It solves the data instability caused by the sliding noise of the rotary potentiometer, avoids the monitoring system from misjudging the separation phenomenon due to abnormal data, improves the accuracy and reliability of the system monitoring and analysis, solves the problem that a mechanical roof displacement sensor cannot realize automatic data monitoring, and realizes the function of real-time monitoring of the movement of the surrounding rock of the coal mine roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the structure of the capacitive grid top plate displacement sensor in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the capacitive grid top plate displacement sensor (with the threaded sleeve exposed) in an embodiment of the present invention;

[0021] Figure 3 It is a partial enlarged schematic diagram of the capacitive grid top plate displacement sensor in the embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of the fluke in an embodiment of the present invention;

[0023] Figure 5 is a schematic cross-sectional structural diagram of an anchor head in an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a top view of the structure of an anchor head in an embodiment of the present invention;

[0025] Figure 7 is a schematic structural diagram of a guide tube in an embodiment of the present invention;

[0026] Figure 8 is a schematic structural diagram of a tray in an embodiment of the present invention;

[0027] Fig. 9 is a schematic structural diagram of a gasket ring in an embodiment of the present invention;

[0028] Fig.10 is a schematic structural diagram of a rotating nut in an embodiment of the present invention;

[0029] Fig.11 is a schematic structural diagram of an upper housing in an embodiment of the present invention;

[0030] Fig.12 is a schematic diagram of the three-dimensional structure of the lower shell in an embodiment of the present invention;

[0031] Fig.13 is a schematic cross-sectional structural diagram of the lower housing in an embodiment of the present invention;

[0032] Fig.14 is a schematic diagram of a top view of the lower housing in an embodiment of the present invention;

[0033] Fig.15 is a bottom view structural schematic diagram of the lower housing in an embodiment of the present invention;

[0034] Fig.16 Schematic diagram of the structure of the moving gate and the fixed gate of the capacitive gate sensor in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Anchor claw; 2. Anchor head; 3. Guide tube; 4. Mounting shell; 5. Capacitive sensor; 6. Tray; 7. Washer ring; 8. Rotating nut; 9. Transparent tube; 10. Threaded sleeve; 11. Rope; 12. Bolt; 13. Bolt hole;

[0037] 101. anchor pipe; 102. elastic strip;

[0038] 201, connecting groove; 202, grease groove; 203, round hole section; 204, tapered hole section; 205, sealing groove; 206, sealing ring; 207, sealing cover; 208, waterproof edge; 209, insertion groove;

[0039] 301, elastic fin;

[0040] 401, upper shell; 402, lower shell; 403, fixed grid opening; 404, lower thread opening;

[0041] 501, fixed grid; 502, moving grid; 503, moving grid bracket; 504, measuring block; 505, fixed block; 506, sensor main board; 507, power supply / communication interface; 508, digital tube display window; 509, fastening screws. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] This embodiment provides a capacitive grid top plate displacement sensor, such as Figures 1 to 16As shown, it includes an anchoring part and a measuring part. The anchoring part includes a first anchor and a second anchor, and the first anchor is used to anchor at a preset depth of a hole drilled in the tunnel roof. The second anchor is used to anchor at the orifice position of the hole drilled in the tunnel roof. The measuring part includes a capacitive grid sensor 5, and the capacitive grid sensor 5 includes a scale assembly, and the scale assembly includes a fixed grid 501 and a moving grid 502. The fixed grid 501 is fixedly connected to the first anchor, and the moving grid 502 is fixedly connected to the second anchor. There can be one or more first anchors, and the number of scale assemblies is consistent with the number of first anchors, that is, each fixed grid 501 is connected to a first anchor. When there is only one first anchor, it is preferably set at the deepest part of the hole drilled in the tunnel roof to monitor the highest level of the tunnel roof. When there are multiple first anchors, multiple first anchors need to be set at different depths of the hole drilled in the tunnel roof, but one of them needs to be located at the deepest part of the hole, and different depths monitor the tunnel roof at different height levels.

[0044] Working principle:

[0045] (1) When there is only one first anchor, when the tunnel roof sinks, the second anchor located at the hole mouth of the tunnel roof drilled in the tunnel will drop accordingly, driving the moving fence 502 to drop, while the first anchor is located at the deepest part of the tunnel roof drilled in the tunnel. Because the deepest position of the drilled hole is usually drilled into the stable rock layer of the tunnel during drilling, the tunnel layer where the first anchor is located will not sink, and the fixed fence 501 will not move. Then, relative movement will occur between the moving fence 502 and the fixed fence 501, thereby measuring the displacement, and the capacitive fence sensor 5 then measures the data and uploads it.

[0046] (2) When there are multiple first anchors, by integrating the data measured by each scale component, it can be known from which first anchor the settlement of the tunnel roof begins, and the delamination layer and delamination amount of the tunnel roof can be obtained, which can be used to determine the scope of roof damage, identify the stability of the tunnel, and evaluate the existing support of the tunnel. The more first anchors there are and the more preset depth values ​​there are at the division point, the more precise the starting position of the tunnel roof settlement can be obtained, and the delamination of the tunnel roof can be grasped in time. The movement of the tunnel surrounding rock can be better determined through the tunnel displacement observation data, and whether the surrounding rock has entered a stable state can be analyzed, so that the signs of roof instability can be discovered early to avoid roof accidents.

[0047] This capacitive grid top plate displacement sensor uses a capacitive grid sensor as the core monitoring component. It is a capacitive digital sensor based on the variable area working principle that can measure large displacements. It is less affected by voltage fluctuations, is not prone to data fluctuations, and does not have the sliding noise inherent in rotary potentiometers. Compared with other digital displacement sensors, such as gratings and inductive synchronizers, it has outstanding characteristics such as small size, simple structure, high resolution and accuracy, fast measurement speed, low power consumption, low cost, and low requirements for the use environment.

[0048] In one embodiment, if Figures 1 to 16 As shown, the first anchoring member includes an anchor claw 1, and the anchor claw 1 is fixedly connected to the fixed fence 501 through a rope 11. The anchor claw 1 can be anchored at a preset depth of the tunnel roof borehole, and the fixed fence 501 can be pulled by the rope 11. It is recommended that the rope 11 be a rope made of non-elastic material that is not easy to break, such as a metal rope, a polyester rope or a synthetic fiber rope, and the metal rope is preferably a steel wire rope. One or more anchor claws 1 can be set as needed, and each anchor claw 1 is connected to a fixed fence 501 through a rope 11, and the fixed fence 501 is suspended by the rope 11. The anchor claw 1 is preset at different hole depths as needed, and one of the anchor claws 1 is set at the bottom of the hole, that is, the deepest part of the borehole.

[0049] In one embodiment, if Figures 1 to 16 As shown, the fluke 1 includes an anchor pipe 101 and an elastic strip 102. The elastic strip 102 is arranged on the peripheral wall of the anchor pipe 101 in a barb-like shape. The anchor pipe 101 can be anchored in the drill hole by using the elastic strip 102 arranged in a barb-like shape. The anchor pipe 101 is fixedly connected to the rope 11. Preferably, the anchor pipe 101 is made of a steel pipe, and the elastic strip 102 is made of a high-elastic steel strip.

[0050] In one embodiment, if Figures 1 to 16 As shown, the second anchoring member includes an anchor head 2 and an anchor container. A connecting groove 201 is provided at one end of the anchor head 2, and a sealing hole is provided at the other end of the anchor head 2, and the sealing hole is connected to the connecting groove 201. The number of the sealing holes is the same as the number of the rope 11, and is used for the rope 11 to pass through and seal. A connecting port is provided on the anchor container, and the connecting port is connected to the connecting groove 201. The anchor container is anchored at the opening position of the hole drilled in the tunnel roof, and the capacitive barrier sensor 5 is installed in the anchor container. The moving fence 502 is fixedly connected to the anchor container. One end of the rope 11 is connected to the fixed fence 501, and the other end of the rope 11 passes through the connecting port, the connecting groove 201 and the sealing hole in sequence to connect to the anchor claw 1. The humidity of the underground environment of the coal mine is relatively high, and water often seeps out of some surrounding rock boreholes. Through the sealing relationship between the sealing hole and the rope 11, it can be avoided that the water seepage and coal ash in the surrounding rock borehole can be prevented from infiltrating into the capacitive barrier sensor 5 through the rope 11, resulting in water in the capacitive barrier sensor 5, causing data instability and jumping problems.

[0051] Further, in one embodiment, if Figures 1 to 16As shown, a grease groove 202 is installed in the connecting groove 201, and the notch end of the grease groove 202 is connected to the sealing hole. The bottom end of the grease groove 202 is provided with a through hole for the rope 11 to pass through, and the number and position of the through holes are consistent with the sealing hole. The grease groove 202 is filled with grease, and the rope 11 passes through the grease groove 202 filled with grease. The grease filled in the grease groove 202 wraps the rope 11, which can further improve the sealing effect between the anchor head 2 and the rope 11.

[0052] Further, in one embodiment, if Figures 1 to 16 As shown, the sealing hole includes a circular hole section 203 and a tapered hole section 204, the small diameter end of the tapered hole section 204 is connected to the circular hole section 203, and the large diameter end of the tapered hole section 204 is connected to the connecting groove 201. The circular hole section 203 is coaxially provided with a sealing groove 205, and a sealing ring 206 is installed in the sealing groove 205. The sealing ring 206 is sleeved on the rope 11 to improve the sealing performance between the sealing hole and the rope 11. The tapered hole section 204 is convenient for the rope 11 to pass upward.

[0053] Further, in one embodiment, if Figures 1 to 16 As shown, one end of the anchor head 2 with the sealing hole is provided with a cover plate groove, which is communicated with the sealing groove 205. The cover plate groove is used to detachably install the sealing cover 207. Removing the sealing cover 207 can facilitate the installation of the sealing ring 206. Installing the sealing cover 207 can compress the sealing ring 206, so that the sealing ring 206 expands and tightly wraps the rope 11 to further improve the sealing performance. The sealing cover 207 is provided with a circular hole section 203 with the same position and number as the rope hole, and the rope hole and the sealing hole. The sealing cover 207 and the cover plate groove can be connected by bolts 12 or screw-like anchors.

[0054] In one embodiment, if Figures 1 to 16As shown, the anchor container includes a guide tube 3, a mounting shell 4, a transparent tube 9 and a threaded sleeve 10. One end of the transparent tube 9 is closed and the other end is open. The open end of the transparent tube 9 is threadedly connected and communicated with one end of the mounting shell 4, and the other end of the mounting shell 4 is threadedly connected and communicated with one end of the threaded sleeve 10. The other end of the threaded sleeve 10 is sleeved (sleeved and fixed) on one end of the guide tube 3, and the other end of the guide tube 3 is sleeved (sleeved and fixed) outside the end of the anchor head 2 provided with a connecting groove 201. An elastic fin 301 is provided on the outer wall of the guide tube 3, and the elastic fin 301 is arranged on the guide tube 3 in a barb shape for anchoring in the tunnel roof drill hole. The moving fence 502 of the capacitive fence sensor 5 is installed in the mounting shell 4, and the fixed fence 501 of the capacitive fence sensor 5 is installed on the fixed fence scale. The fixed fence scale is connected to the rope 11, and the fixed fence scale extends into the transparent tube 9. The rope 11 passes through the mounting shell 4, the threaded sleeve 10 and the guide tube 3 in sequence. The fixed scale is provided with scale lines for mechanically indicating the change in displacement. The scale lines on the fixed scale can be observed through the transparent tube 9. Preferably, the guide tube 3 is a metal tube, such as a stainless steel tube, but this does not mean that other materials cannot be used, such as plastic tubes. The transparent tube 9 is a glass tube or a transparent plastic tube, such as an acrylic tube.

[0055] In one embodiment, if Figures 1 to 16 As shown, bolt holes 13 are correspondingly provided on the threaded sleeve 10 and the guide tube 3, and the bolt holes 13 are used for threaded connection with bolts 12 or screws. The threaded sleeve 10 is sleeved on the guide tube 3, and the bolts 12 or screws are screwed into the bolt holes 13 of the threaded sleeve 10 and the guide tube 3, so that the threaded sleeve 10 and the guide tube 3 can be fixedly connected.

[0056] In one embodiment, if Figures 1 to 16 As shown, a tray 6, a gasket 7 and a rotating nut 8 are sequentially arranged on the threaded sleeve 10. The tray 6 is close to the guide tube 3 for contacting with the tunnel roof. The gasket 7 is sleeved on the threaded sleeve 10. The rotating nut 8 is threadedly connected with the threaded sleeve 10 and close to the mounting shell 4. The height of the tray 6 can be adjusted by rotating the rotating nut 8 so that it can effectively contact the tunnel roof. The tray 6 is provided to facilitate the second anchor to descend with the tunnel roof.

[0057] In one embodiment, if Figures 1 to 16 As shown, a waterproof edge 208 is provided on the outer wall of the anchor head 2, and an insertion groove 209 is formed between the waterproof edge 208 and the outer wall of the anchor head 2. After the guide tube 3 is sleeved on the outer wall of the anchor head 2 and inserted into the insertion groove 209, it is fixedly connected to the anchor head 2, and the fixed connection method can be high-strength adhesive bonding. The waterproof edge 208 is provided so that the joint between the anchor head 2 and the guide tube 3 is hidden inside the insertion groove 209, preventing water from seeping into the guide tube 3 from the joint, causing water to enter the inside of the capacitive grid sensor 5.

[0058] In one embodiment, if Figures 1 to 16As shown, the mounting shell 4 includes an upper shell 401 and a lower shell 402, and the upper shell 401 and the lower shell 402 are detachably connected, and the detachable connection method can be a bolt connection method. The upper shell 401 is provided with an upper threaded opening, and the upper threaded opening is used to be threadedly connected with the threaded sleeve 10. The lower shell 402 is provided with a lower threaded opening 404, and the lower threaded opening 404 is used to be threadedly connected with the transparent tube 9. The sensor mainboard 506 of the capacitive grid sensor 5 is arranged in the lower shell 402, and the power supply / communication interface 507 of the capacitive grid sensor 5 extends out of the lower shell 402, and the moving grid 502 is installed in the upper shell 401 through the moving grid bracket 503. Rotating the upper shell 401 downward can drive the moving grid 502 to move downward, so that the moving grid 502 and the fixed grid 501 are relatively moved, thereby generating an initial displacement value, and tightening the rope 11. The moving grid bracket 503 is connected to the upper shell 401 by screws or bolts 12. Preferably, the power supply / communication interface 507 adopts an aviation joint. The sensor main board 506 and the aviation plug are fixed to the upper shell 401 by screws and nuts respectively. The sensor main board 506 is provided with a digital tube display window 508 for displaying information such as measurement data, and the lower shell 402 is provided with a display port for the digital tube display window 508 to be exposed. The upper shell 401 and the lower shell 402 are both provided with fixed grid openings 403, and the number of fixed grid openings 403 is consistent with the number of fixed grids 501. If there are three fixed grids 501, then the upper shell 401 and the lower shell 402 are respectively provided with three fixed grid openings 403, and the corresponding ropes 11 are three. The sensor main board 506 is provided with a main board opening for the fixed grid 501 to pass through.

[0059] In one embodiment, if Figures 1 to 16 As shown, a measuring block 504 is provided at the bottom of the fixed fence scale of the fixed fence 501, and the measuring block 504 is fixed to the fixed fence 501 by a fastening screw 509, and a fixing block 505 is fixed to the measuring block 504 by a fastening screw 509. Rope holes are provided on the fixed fence 501, the measuring block 504 and the fixing block 505 for the rope 11 to pass through, and the rope 11 passes through the fixing block 505, the measuring block 504, the fixed fence 501, the mounting shell 4, the guide tube 3 and the anchor head 2 in sequence, and finally connects with the anchor tube 101 of the anchor claw 1. The fixing block 505 presses the rope 11 by the fastening screw 509 to achieve a fixed connection between the rope 11 and the fixed fence 501. Because the fixing block 505 is below the hole drilled in the tunnel roof, the distance from the coal mine tunnel roof is increased, which is convenient for the installer to install the fastening screw 509, avoiding the problem of failure to fasten in place due to narrow space, and solving the problem of displacement monitoring failure. In the existing delamination meters, the fixing block 505 and the fastening screw 509 are generally located at the position of the 7th gasket. Therefore, during installation, the distance between the fastening screw 509 and the tunnel roof is too small, making it inconvenient for workers to tighten the fastening screw with a screwdriver. As a result, the wire rope (rope 11) may slip, resulting in monitoring failure. The fastening screw 509 of this product is located at the bottom of the entire product, which is convenient for installation operation.

[0060] In one embodiment, if Figures 1 to 16 As shown, the sensor main board 506 can also be equipped with a light control function, which can trigger the light control function of the sensor by changing the brightness through illumination, and the data display function (digital tube display window 508) can be displayed by light control triggering, and multiple displacement data can be displayed in turn. The sensor main board 506 has an RS485 communication function, which can be connected to the associated equipment through the aviation plug (power / communication interface 507), and the sensor parameters can be set, and the sensor monitoring data can be uploaded to the associated equipment.

[0061] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A capacitive grid top plate displacement sensor, characterized in that: It includes an anchoring part and a measuring part, the anchoring part includes a first anchor and a second anchor, the first anchor is used to anchor at a preset depth of a hole drilled in the tunnel roof, the second anchor is used to anchor at a hole mouth position of the hole drilled in the tunnel roof, the measuring part includes a capacitive grid sensor, the capacitive grid sensor includes a scale assembly, the scale assembly matches the number of the first anchor, the scale assembly includes a fixed grid and a moving grid, the fixed grid is fixedly connected to the first anchor, and the moving grid is fixedly connected to the second anchor.

2. A capacitive grid top plate displacement sensor according to claim 1, characterized in that: The first anchoring member comprises an anchor claw, and the anchor claw is fixedly connected to the fixed grid through a rope.

3. A capacitive grid top plate displacement sensor according to claim 2, characterized in that: The fluke comprises an anchor tube and an elastic strip, wherein the elastic strip is arranged on the peripheral wall of the anchor tube in a barb-like shape, and the anchor tube is fixedly connected to the rope.

4. The capacitive grid top plate displacement sensor according to claim 2, characterized in that: The second anchoring member includes an anchoring head and an anchoring container, one end of the anchoring head is provided with a connecting groove, the other end of the anchoring head is provided with a sealing hole, the sealing hole is connected with the connecting groove, the anchoring container is provided with a connecting port connected with the connecting groove, the anchoring container is anchored at the hole mouth position of the hole drilled in the tunnel roof, the capacitive fence sensor is installed in the anchoring container, the moving fence is fixedly connected with the anchoring container, one end of the rope is connected with the fixed fence, and the other end of the rope passes through the connecting port, the connecting groove and the sealing hole in sequence and is connected with the anchor claw.

5. A capacitive grid top plate displacement sensor according to claim 4, characterized in that: A grease groove is installed in the connecting groove, the groove end of the grease groove is connected to the sealing hole, the groove bottom end of the grease groove is provided with a through hole for the rope to pass through, and the grease groove is filled with grease.

6. The capacitive grid top plate displacement sensor according to claim 4, characterized in that: The sealing hole comprises a circular hole section and a conical hole section, the small diameter end of the conical hole section is connected to the circular hole section, the large diameter end of the conical hole section is connected to the connecting groove, a sealing groove is coaxially provided on the circular hole section, and a sealing ring is installed in the sealing groove.

7. The capacitive grid top plate displacement sensor according to claim 4, characterized in that: The anchoring container includes a guide tube, a mounting shell, a threaded sleeve and a transparent tube, one end of the transparent tube is closed and the other end is open, the open end of the transparent tube is threadedly connected and communicated with one end of the mounting shell, the other end of the mounting shell is threadedly connected and communicated with one end of the threaded sleeve, the other end of the threaded sleeve is sleeved on one end of the guide tube, and the other end of the guide tube is sleeved on the outside of one end of the anchor head provided with a connecting groove, an elastic fin is provided on the outer wall of the guide tube, and the elastic fin is arranged on the guide tube in a barb shape, the moving grid is installed in the mounting shell, the fixed grid of the capacitive grid sensor is installed on the fixed grid scale, the fixed grid scale is connected to the rope, the fixed grid scale extends into the transparent tube, and the rope passes through the mounting shell, the threaded sleeve and the guide tube in sequence.

8. The capacitive grid top plate displacement sensor according to claim 7, characterized in that: The threaded sleeve is provided with a tray, a gasket and a rotating nut in sequence. The tray is close to the guide tube for abutting against the tunnel roof. The gasket is sleeved on the threaded sleeve. The rotating nut is threadedly connected to the threaded sleeve and close to the mounting shell.

9. The capacitive grid top plate displacement sensor according to claim 8, characterized in that: A waterproof edge is provided on the outer wall of the anchor head, an insertion groove is formed between the waterproof edge and the outer wall of the anchor head, and the guide tube is inserted into the insertion groove and fixedly connected.

10. The capacitive grid top plate displacement sensor according to claim 8, characterized in that: The mounting shell includes an upper shell and a lower shell that are detachably connected, the upper shell is provided with an upper threaded opening for threaded connection with the threaded sleeve, the lower shell is provided with a lower threaded opening for threaded connection with the transparent tube, the sensor mainboard of the capacitive barrier sensor is arranged in the lower shell, the power supply / communication interface of the capacitive barrier sensor extends out of the lower shell, and the moving barrier is installed in the upper shell through a moving barrier bracket.

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