Ground subsidence monitoring device for goaf

Abstract

The utility model provides a goaf land subsidence monitoring device, which belongs to the technical field of geological disaster monitoring equipment, and comprises an infrared transmitting unit and an infrared receiving unit, the infrared receiving unit is composed of a reflective mirror, a light spot position detection sensor, a shell and a lens. According to the device, the infrared emission sensor in the infrared emission unit is used for emitting infrared rays with a constant angle to the infrared receiving unit, and the infrared receiving unit is used for reflecting the received infrared rays to the light spot position detection sensor through the reflective mirror; the fixed support in the infrared emission unit inclines, and the light spot monitored by the light spot position detection sensor moves, so that the real-time monitoring of the ground subsidence condition of the goaf is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of geological disaster monitoring equipment, and in particular relates to a ground subsidence monitoring device for a goaf area. Background Art

[0002] In areas rich in coal resources, a large number of goafs are formed underground due to coal mining. There may be villages, farmlands, and even roads above the goafs. In order to prevent ground subsidence in the goafs from causing cracks in houses and ground (farmland) collapse, the goafs need to be reinforced or backfilled. However, even if the goafs are treated, due to the influence of geological activities and other factors, there will still be problems such as ground subsidence or even collapse in the goafs. If the ground subsidence can be detected in time when it is small in the goafs, measures can be taken in time to avoid greater geological disasters.

[0003] In current technology, ground subsidence in goafs is generally monitored regularly by leveling or by GPS for elevation positioning. However, regular leveling cannot achieve real-time monitoring of ground subsidence, and GPS for elevation positioning has the problems of high cost and relatively low accuracy. Therefore, the above two methods cannot achieve real-time monitoring of tiny subsidence in goafs. Utility Model Content

[0004] In order to solve the shortcomings and deficiencies of the prior art, a device for monitoring ground subsidence in goaf is provided, thereby solving the problem that the prior method cannot realize real-time monitoring of minute subsidence in goaf.

[0005] In order to achieve the purpose of the utility model, a ground subsidence monitoring device for a goaf area is provided, which includes an infrared transmitting unit and an infrared receiving unit. The infrared transmitting unit is arranged on the ground directly above the goaf area, and is used to continuously transmit infrared rays to the infrared receiving unit. The infrared receiving unit is arranged on the ground directly above the non-goaf area, and is used to image the received infrared rays into a light spot and then determine the subsidence of the goaf area by observing the displacement of the light spot.

[0006] As a further improvement of the above scheme, the infrared emitting unit includes a mounting frame, and fixed brackets are fixed on the front and rear sides of the mounting frame by screws, and the bottom of the fixed bracket is conical to facilitate insertion into the ground of the goaf, and an infrared emitting fixed frame is fixed between the left and right mounting columns on the top of the mounting frame, and a central axis is installed between the front and rear infrared emitting fixed frames, and an infrared emitting sensor is sleeved on the outer wall of the central axis. The infrared emitting sensor can be rotated around the central axis to adjust the infrared emission angle.

[0007] As a further improvement of the above scheme, the infrared receiving unit includes a shell, the left side of the shell is open to allow the entry of infrared rays, a light spot position detection sensor is fixed to the top of the shell, the light spot position detection sensor is connected to the control center to achieve continuous signal collection, and a reflector is installed on the right side of the shell to reflect the received infrared rays to the light spot position detection sensor, thereby continuously monitoring the light spot position.

[0008] As a further improvement of the above solution, a lens is fixed to the left side of the housing, so as to keep the housing in a dust-free or low-dust environment and avoid interference of dust on the light spot displacement monitoring.

[0009] As a further improvement of the above solution, the reflector is a convex mirror, which further improves the reflection range of the received infrared rays.

[0010] As a further improvement of the above solution, a semi-circular counterweight is provided at the bottom of the mounting frame, and the fixing bracket needs to be parallel to the center line of the semi-spherical counterweight when inserted into the ground.

[0011] The beneficial effects of the utility model are:

[0012] Compared with the prior art, the utility model provides a device for monitoring ground subsidence in goaf areas. The device utilizes an infrared transmitting sensor in an infrared transmitting unit to transmit infrared rays with a constant angle to an infrared receiving unit. The infrared receiving unit utilizes a reflector to reflect the received infrared rays to a light spot position detection sensor. When a slight subsidence occurs on the ground in the goaf area, the fixed bracket in the infrared transmitting unit tilts, and the light spot monitored by the light spot position detection sensor moves, thereby realizing real-time monitoring of the ground subsidence in the goaf area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation method of the utility model;

[0014] Figure 2 It is a top view of the infrared emitting unit of the utility model;

[0015] Figure 3 This is a front view of the infrared emitting unit of the utility model;

[0016] Figure 4 The figure is a schematic diagram of the internal structure of the mid-infrared receiving unit of the utility model.

[0017] Among them, 1-infrared transmitting unit; 2-infrared receiving unit; 11-fixed bracket; 12-mounting frame; 13-infrared transmitting sensor; 14-infrared transmitting fixing frame; 21-reflector; 22-spot position detection sensor; 23-housing; 24-lens. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings:

[0019] according to Figure 1-Figure 4 As shown, the utility model provides a ground subsidence monitoring device for goaf areas, comprising an infrared transmitting unit 1 and an infrared receiving unit 2. The infrared transmitting unit 1 is arranged on the ground directly above the goaf area, and is used for continuously transmitting infrared rays to the infrared receiving unit 2. The infrared receiving unit 2 is arranged on the ground directly above the non-goaf area, and is used for imaging the received infrared rays into a light spot and then determining the subsidence of the goaf area by observing the displacement of the light spot.

[0020] The infrared emitting unit 1 includes a mounting frame 12, and a fixing bracket 11 is fixedly installed on the front and rear sides of the mounting frame 12 by screws. The bottom of the fixing bracket 11 is conical to facilitate insertion into the ground of the goaf. An infrared emitting fixing frame 14 is fixed between the left and right mounting columns on the top of the mounting frame 12. A central axis is installed between the front and rear infrared emitting fixing frames 14. An infrared emitting sensor 13 is sleeved on the outer wall of the central axis. The infrared emitting sensor 13 can be rotated around the central axis to adjust the infrared emitting angle. A semicircular counterweight is arranged at the bottom of the mounting frame 12. When the fixing bracket 11 is inserted into the ground, it must be parallel to the center line of the hemispherical counterweight.

[0021] The infrared receiving unit 2 includes a shell 23, the left side of the shell 23 is open to allow infrared rays to enter, a light spot position detection sensor 22 is fixed to the top of the shell 23, the light spot position detection sensor 22 is connected to the control center to achieve continuous signal collection, a reflector 21 is installed on the right side of the shell 23 to reflect the received infrared rays to the light spot position detection sensor 22, thereby continuously monitoring the light spot position, a lens 24 is fixed on the left side of the shell 23 to keep the shell 23 in a dust-free or low-dust environment to avoid dust interference with light spot displacement monitoring, and the reflector 21 is a convex mirror to further improve the reflection range of the received infrared rays.

[0022] The utility model provides a ground settlement monitoring device for goaf areas. When in use, the fixing bracket 11 is vertically fixed on the ground of the goaf area, the mounting frame 12 can be a frame structure made of hard plastic, and the infrared light emitted by the infrared emission sensor 13 is reflected by the reflector 21 through the lens 24 to the light spot position detection sensor 22. In the present application, the reflector 21 can be made of coated metal with a reflectivity greater than or equal to 90%. The light spot position detection sensor 22 can be a PSD sensor. In the present application, in order to avoid the movement of the infrared emission unit 1 in the horizontal position, the PSD sensor can be a two-dimensional PSD sensor.

[0023] When the ground in the goaf settles, the fixed support 11 follows and descends, and the infrared rays emitted by the infrared emission sensor 14 also descend, and the infrared rays are reflected at different positions by the reflector 21, and the reflected infrared rays and the incident infrared rays are symmetrical about the center line of the reflector 21, and the center line of the reflector 21 and the reflected infrared rays and the incident infrared rays form an intersection on the surface of the reflector 21. At this time, the reflected infrared rays formed at different positions of the reflector 21 have an angle, and the spot spacing formed on the horizontal plane is greater than the descending distance of the fixed support 11, so that the ground settlement distance of the goaf can be detected more accurately.

[0024] It should be supplemented that the reflector 21 can be a hemispherical surface or a spherical crown surface with a radius of 2-10 cm.

[0025] The utility model provides a device for monitoring ground subsidence in goaf areas. When monitoring ground subsidence in goaf areas:

[0026] like Figure 1 As shown, multiple fixing brackets 11 are vertically fixed on the ground of the goaf area, and multiple infrared receiving units 2 are fixed on the ground of the non-goaf area. 1-3 infrared emitting units 1 emit infrared rays into one infrared receiving unit 2. The light spot position detection sensors 22 in the multiple infrared receiving units 2 are all connected to the control center.

[0027] Due to the influence of external forces such as wind, the light spot formed by the infrared rays emitted by a certain infrared emitting unit 1 may shift in a short time (1-2 seconds) and quickly reset. The control center may regard it as an erroneous measurement and discard the data.

[0028] When only a few of the multiple infrared emitting units 1, such as 1, 2, 5, etc., which account for less than 40% of the total number of infrared emitting units 1, and the infrared rays emitted by the infrared emitting units 1 are shifted in position, it can be considered that the infrared emitting units 1 have collapsed due to wind or other geological problems.

[0029] When more than 40% of the light spots formed by the infrared rays emitted by the infrared emitting units 1 are shifted in position, it can be considered that ground subsidence occurs, and the ground subsidence distance is calculated based on the light spot displacement distance.

[0030] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the utility model and are not intended to limit them. Any modification or equivalent replacement that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A ground subsidence monitoring device for goaf areas, characterized in that: The invention comprises an infrared transmitting unit (1) and an infrared receiving unit (2), wherein the infrared transmitting unit (1) is arranged on the ground directly above the goaf area and is used to continuously transmit infrared rays to the infrared receiving unit (2), and the infrared receiving unit (2) is arranged on the ground directly above the non-goaf area and is used to form a light spot by imaging the received infrared rays and then determine the settlement of the goaf area by observing the displacement of the light spot.

2. A device for monitoring ground subsidence in a goaf area according to claim 1, characterized in that: The infrared emitting unit (1) comprises a mounting frame (12), and a fixing bracket (11) is fixedly mounted on the front and rear sides of the mounting frame (12) by means of screws, and the bottom of the fixing bracket (11) is conical so as to facilitate insertion into the ground of the goaf area, and an infrared emitting fixing frame (14) is fixed between the left and right mounting columns at the top of the mounting frame (12), and a central axis is installed between the front and rear infrared emitting fixing frames (14), and an infrared emitting sensor (13) is sleeved on the outer wall of the central axis, and the infrared emitting sensor (13) can be rotated around the central axis to adjust the infrared emitting angle.

3. A device for monitoring ground subsidence in a goaf area according to claim 2, characterized in that: The infrared receiving unit (2) comprises a housing (23), the left side of the housing (23) is open to allow infrared rays to enter, a light spot position detection sensor (22) is fixed on the top of the housing (23), the light spot position detection sensor (22) is connected to a control center to achieve continuous signal collection, and a reflector (21) is installed on the right side of the housing (23) to reflect the received infrared rays to the light spot position detection sensor (22), thereby continuously monitoring the light spot position.

4. A device for monitoring ground subsidence in goaf area according to claim 3, characterized in that: A lens (24) is fixed on the left side of the housing (23), thereby maintaining the housing (23) in a dust-free or low-dust environment and preventing dust from interfering with the light spot displacement monitoring.

5. The device for monitoring ground subsidence in goaf area according to claim 4, characterized in that: The reflector (21) is a convex mirror, which further increases the reflection range of the received infrared rays.

6. The device for monitoring ground subsidence in a goaf area according to claim 2, characterized in that: A semicircular counterweight is provided at the bottom of the mounting frame (12), and the fixing bracket (11) needs to be parallel to the center line of the semicircular counterweight when inserted into the ground.

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