Hydraulic support embedded type working face rear bottom plate damage depth while-mining and while-detecting device

Abstract

The utility model discloses a hydraulic support embedded type device for detecting the damage depth of a bottom plate behind a working face while mining, and relates to the field of coal mine safety. The device comprises a hydraulic support, an electromagnetic signal acquisition device, a goaf signal transmitting device, an electromagnetic signal transmitting control switch and a mining damage detection display device. A base embedded groove is formed in the rear end of a support base, an electromagnetic signal collecting device is connected in the base embedded groove, an electromagnetic signal transmitting control switch is arranged on the upper portion of the base embedded groove, a mining damage detection display device is arranged on the inner side of a shield beam, and a goaf signal transmitting device is embedded in a bottom plate behind a working face. When the device is used, the electromagnetic signal emission control switch emits radio waves, the radio waves are received by the goaf signal emission controller, then the electromagnetic signal emitter is controlled to emit electromagnetic signals, the electromagnetic signals are received by the electromagnetic signal acquisition device below the support base, real-time dynamic detection of the damage depth of a bottom plate behind a working face is achieved, and detection is achieved while mining is conducted.

Description

Technical Field

[0001] The utility model relates to the field of coal mine safety, in particular to a hydraulic support embedded type working surface rear bottom plate destruction depth simultaneous mining and detection device. Background Art

[0002] During the mining process of the coal seam working face, the stress state of the roof, floor and tunnel surrounding rock will undergo periodic changes due to the mining effect, tectonic stress, self-gravity, etc. Due to the excavation of the coal body, the self-weight stress of the roof rock mass in front of the mining working face will be transferred to the unmined area in front, thus forming a stress concentration area, causing the stress on the floor to intensify into a compression state, at which time the stress of the floor will be greater than the original rock stress; the rock mass of the floor in the goaf area behind the working face is in a decompression state, and the rock strata within a certain depth range will produce interlayer horizontal and vertical cracks, at which time the floor rock strata will be in a bottom drum expansion state; as the working face advances, the roof rock strata in the goaf area behind will collapse, and the falling coal gangue will fill the excavated space, at which time the floor rock strata will be in a compression state. Therefore, the coal mining process will cause the destruction of the coal seam floor, leading to the development of rock cracks in the coal seam floor and the undulation of the floor, thereby reducing the water-proofing capacity of the coal seam floor waterproof layer, which may cause the underlying coal seam pressurized water to break through the barrier of the floor waterproof layer and enter the working face or behind the working face in the form of sudden, slow or delayed initiation, causing the danger of floor water inrush. Correctly understanding the mechanism of coal seam floor damage and determining the depth of coal seam floor mining damage are important contents for preventing the danger of coal seam floor water inrush.

[0003] During coal mining, only the floor of the goaf behind the working face undergoes the process of pressure relief and compression, so the maximum damage depth of the coal seam floor is generally behind the working face. Existing methods for detecting the damage depth of the coal seam floor underground include, for example, digging a drill hole in the tunnel adjacent to the working face, drilling a dipped and inclined borehole below the working face, injecting water into the borehole before and after the working face is mined, and measuring the permeability of the borehole to understand the damage and loosening of the coal seam floor rock strata. Before the working face is mined, the original crack development law of the floor rock strata can be studied, and after the working face is mined, the damage depth of the coal seam floor can be studied and determined; for example, mine workers use handheld geological radars for detection, mainly using the difference in the dielectric constant of underground media to detect the damage depth of the coal seam floor by emitting high-frequency electromagnetic waves.

[0004] Since the rock layer on the top of the goaf behind the working face may collapse and the coal gangue may fall, which is very dangerous, workers cannot enter the goaf to conduct construction detection on the bottom plate. Therefore, it is currently impossible to detect the damage depth of the bottom plate of the goaf behind the working face. The utility model can effectively detect the damage depth of the bottom plate of the goaf behind the working face. Utility Model Content

[0005] In order to solve the deficiencies mentioned in the above background technology, the purpose of the utility model is to provide a device for simultaneously mining and detecting the damage depth of the bottom plate behind the working surface embedded in a hydraulic support.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A device for detecting the damage depth of the bottom plate behind a working face while mining is provided with a hydraulic support embedded therein, comprising a hydraulic support, an electromagnetic signal acquisition device, a goaf area signal transmitting device, an electromagnetic signal transmitting control switch and a mining damage detection and display device.

[0008] Furthermore, the hydraulic support is mainly divided into a support base, a support column, a support connecting rod, a shielding beam and a support top beam. The support column connects the support base and the support top beam, and the support connecting rod connects the shielding beam and the support base.

[0009] Furthermore, a base embedded groove with an opening facing downward is provided at the rear end of the support base of the hydraulic support, an electromagnetic signal acquisition device is connected to the base embedded groove, the electromagnetic signal acquisition device consists of an electromagnetic signal processor and an electromagnetic signal receiver, an electromagnetic signal emission control switch is provided on the upper part of the base embedded groove, and a mining damage detection and display device is provided on the inner side of the protective beam.

[0010] Furthermore, the goaf area signal transmitting device is composed of a goaf area signal transmitting controller, an electromagnetic signal transmitter and an explosion-proof battery, and the explosion-proof battery provides energy for the goaf area signal transmitting device.

[0011] Furthermore, the specific application principle of the hydraulic support embedded working surface rear bottom plate destruction depth simultaneous mining and detection device is as follows:

[0012] The electromagnetic signal transmission control switch transmits radio waves, which are received by the goaf signal transmission controller of the goaf signal transmitting device, and then the electromagnetic signal transmitter is controlled to transmit electromagnetic signals, which are received by the electromagnetic signal receiver in the electromagnetic signal acquisition device, and the electromagnetic signal is converted into an electrical signal by the electromagnetic signal processor, and finally the electrical signal is transmitted to the mining damage detection display device through the transmission cable. The working face moves forward, and the electromagnetic signal acquisition device in the recess embedded in the base moves forward with the hydraulic support, so that the detection range of the goaf floor behind the working face by a hydraulic support embedded working face bottom plate damage depth mining and detection device moves forward.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model makes up for the deficiency of the prior art that the damage depth of the bottom plate of the goaf behind the working face cannot be detected. The device is provided with an electromagnetic signal collecting device at the rear end position of the traditional hydraulic support base, which is installed in the built-in groove of the base, and the goaf signal transmitting device is buried in the bottom plate of the goaf behind the working face, and adopts the electromagnetic signal receiving method of "front receiving and back transmitting". The device for detecting the damage depth of the bottom plate of the working face behind the embedded hydraulic support can detect the damage depth of the bottom plate of the goaf behind the working face as the hydraulic support moves, so as to achieve the purpose of detecting while mining.

[0015] (2) The utility model relates to a hydraulic support embedded bottom plate damage depth detection device behind the working face, which can control the goaf signal transmitting device to transmit electromagnetic signals at any time through the electromagnetic signal transmitting control switch, so as to ensure that each goaf signal transmitting device can transmit electromagnetic signals independently, and adopts the "one send and multiple receive" electromagnetic signal receiving method to expand the detection range and avoid mutual interference of electromagnetic signals.

[0016] (3) The utility model is a device for detecting the damage depth of the bottom plate behind the working surface embedded in a hydraulic support. The operation is simple. When carrying out mining work, the staff can adjust the mining measures according to the feedback results of the mining damage detection display device, so as to achieve the purpose of improving efficiency and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings;

[0018] Figure 1 Arrange a plan for the floor detection device;

[0019] Figure 2 This is a front view of the electromagnetic signal transmission and reception of the bottom plate detection device;

[0020] Figure 3 It is a plan view of the electromagnetic signal of the bottom plate detection device that transmits and receives multiple signals;

[0021] Figure 4 It is the side view of hydraulic support;

[0022] Figure 5 This is a front view of the goaf area signal transmitter;

[0023] Figure 6 This is the plan view of the hydraulic support base;

[0024] Figure 7 It is the plan view of the installation of the display screen for the hydraulic support shield beam;

[0025] The following are the descriptions of the reference numerals:

[0026] 1. Hydraulic support; 1-1. Support base; 1-2. Support column; 1-3. Support connecting rod; 1-4. Protective beam; 1-5. Support top beam; 2. Built-in groove in the base; 3. Electromagnetic signal acquisition device; 3-1. Electromagnetic signal processor; 3-2. Electromagnetic signal receiver; 4. Goaf signal transmitting device; 4-1. Goaf signal transmitting controller; 4-2. Electromagnetic signal transmitter; 4-3. Explosion-proof battery; 5. Electromagnetic signal transmitting control switch; 6. Mining damage detection and display device. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown. A hydraulic support embedded working face rear bottom plate damage depth detection device mainly includes two parts. One part is a base embedded groove 2 with an opening downward at the rear end of the support base 1-1. The base embedded groove 2 with an opening downward is conducive to the electromagnetic signal acquisition device 3 receiving electromagnetic waves reflected from the bottom plate rock layer. The base embedded groove 2 is connected to the electromagnetic signal acquisition device 3, and the electromagnetic signal acquisition device 3 is composed of an electromagnetic signal processor 3-1 and an electromagnetic signal receiver 3-2. The above-mentioned hydraulic support 1 is used every 15m in the coal mining working face; the other part is the goaf signal transmitting device 4, which is composed of a goaf signal transmitting controller 4-1, an electromagnetic signal transmitter 4-2 and an explosion-proof battery 4-3. The goaf signal transmitter 4 is buried every 50m on the bottom plate of the coal mining face. As the coal mining face advances forward, the location where the goaf signal transmitter 4 is placed will become the goaf behind the face, and as the coal mining face advances, another row of goaf signal transmitters 4 is buried every 25m. The goaf signal transmitter 4 transmits electromagnetic signals, and the electromagnetic signal acquisition device 3 receives electromagnetic signals, forming a "front receiving and rear transmitting" working mechanism. As the face advances forward, the electromagnetic signal acquisition device 3 in the recess 2 embedded in the base moves forward with the hydraulic support 1, and the detection range of the goaf bottom plate behind the face by a hydraulic support embedded type working face rear bottom plate damage depth mining and detection device advances forward.

[0029] like Figure 3As shown, a hydraulic support embedded working face rear floor damage depth detection device, a goaf signal transmission controller 4-1 is provided in the goaf signal transmitting device 4, and the electromagnetic signal transmission control switch 5 on each hydraulic support 1 transmits radio waves of different frequencies to control different goaf signal transmitting devices 4 to transmit electromagnetic signals respectively, and then each electromagnetic signal acquisition device 3 receives the electromagnetic signal, forming a "one send and multiple receive" electromagnetic signal receiving mode, thereby expanding the monitoring range of the goaf floor behind the working face. Radio waves of different frequencies need to be received by the corresponding goaf signal transmission controller 4-1, so different electromagnetic signal transmission control switches 5 transmit radio waves of different frequencies to control different goaf signal transmitting devices 4 to transmit electromagnetic signals.

[0030] like Figure 6 and Figure 7 As shown, a hydraulic support embedded working face rear floor damage depth detection device, the electromagnetic signal acquisition device 3 forwards the image formed by the detected data to the mining damage detection display device 6 set inside the shield beam 1-4. The detection device can feed back the real-time working face rear floor damage depth information to the staff inside the hydraulic support 1. The staff makes decisions based on the information fed back by the mining damage detection device display screen 6, adjusts the mining plan to avoid excessive mining, improper mining methods, which aggravates the damage of the rear floor of the working face and causes water to come out of the floor, thereby improving work efficiency, reducing the labor consumption of the staff, and reducing the risk factor.

[0031] A hydraulic support embedded working face rear floor damage depth detection device adopts high-frequency pulse electromagnetic wave directional emission. During the propagation, the electromagnetic wave encounters different electrical interfaces or uneven geological bodies to produce reflections (echoes). The echoes are identified in the time domain and their travel time is determined, thereby determining the spatial position of the interface or geological body. The specific application principle of electromagnetic wave detection of the floor damage depth of the goaf area is as follows:

[0032] The propagation speed of electromagnetic waves in a vacuum is known as c, the relative dielectric constant of the coal seam is 2.3 to 3.6, the relative dielectric constant of the rock layer is generally 4 to 9, and the relative dielectric constant of the bottom rock layer is known as E Y ,v Y is the propagation speed of electromagnetic waves in each rock layer of the coal seam floor within the detection range, and Y is the number of rock layers of the coal seam floor within the detection range.

[0033]

[0034] The distance between the goaf signal transmitting device 4 and the electromagnetic signal collecting device 3 is known as x. k-n , where k is the number of electromagnetic signal acquisition devices 3, n is the number of goaf signal transmitting devices 4; the propagation time of electromagnetic waves in the bottom rock layer is known to be tk-i , i is the number of times each electromagnetic signal collection device receives electromagnetic waves; h m It is the destruction depth of the rock layer at the bottom of the goaf.

[0035]

[0036] The maximum damage depth of the goaf floor is h max .

[0037] h max =max(h1,h2,h3,……,h m-1 ,h m ) (3)

[0038] The measured data are converted into electrical signals and transmitted to the mining damage detection and display device 6 through a transmission cable to generate an electromagnetic wave reflection map, which can be used as a basis for judging the depth of damage to the floor of the goaf.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A hydraulic support embedded working surface rear bottom plate destruction depth simultaneous mining and detection device, characterized in that: It comprises a hydraulic support (1), an electromagnetic signal acquisition device (3), a goaf signal emission device (4), an electromagnetic signal emission control switch (5) and a mining damage detection and display device (6); a support base (1-1) of the hydraulic support (1) is provided with a base embedded groove (2) at the rear end, the base embedded groove (2) is connected with an electromagnetic signal acquisition device (3), the electromagnetic signal acquisition device (3) is composed of an electromagnetic signal processor (3-1) and an electromagnetic signal receiver (3-2), and an electromagnetic signal emission control switch (5) is provided on the upper part of the base embedded groove (2); The hydraulic support (1) comprises a support base (1-1), a support column (1-2), a support connecting rod (1-3), a shielding beam (1-4), and a support top beam (1-5); the support top beam (1-5) is connected to the shielding beam (1-4); the support top beam (1-5) and the shielding beam (1-4) are respectively connected to the support base (1-1) via the support column (1-2) and the support connecting rod (1-3); A mining damage detection and display device (6) is provided on the inner side of the shield beam (1-4), and the goaf signal transmitting device (4) is composed of a goaf signal transmitting controller (4-1), an electromagnetic signal transmitter (4-2) and an explosion-proof battery (4-3).

2. The device for detecting the damage depth of the bottom plate behind the embedded working surface of a hydraulic support according to claim 1 is characterized in that: The goaf signal transmitting device (4) is buried in the goaf floor behind the working face, and the electromagnetic signal transmitting control switch (5) transmits radio waves, which are received by the goaf signal transmitting controller (4-1), and the electromagnetic signal transmitter (4-2) is controlled to transmit electromagnetic signals, which are received by the electromagnetic signal receiver (3-2) in the electromagnetic signal acquisition device (3), and then the electromagnetic signal processor (3-1) converts the electromagnetic signal into an electrical signal, and finally transmits the electrical signal to the mining damage detection and display device (6) through a transmission cable.

3. The device for detecting the damage depth of the bottom plate behind the embedded working surface of a hydraulic support according to claim 1 is characterized in that: The electromagnetic signal emission control switch (5) can remotely control the goaf area signal emission device (4) to emit electromagnetic signals.

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