Monitoring device and method for slurry diffusion range inside goaf during paste filling process

Abstract

The present invention relates to the technical field of coal mine gangue slurry filling, and provides a device and method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process. Inside the goaf, the slurry seeps into the liquid collection cylinder body, and the change in the liquid density inside the cylinder body is monitored in real time through a liquid density monitoring device, and the monitoring data is transmitted to the ground data monitoring system in real time through an armored cable. The permeable slurry plate is installed on the top of the liquid collection cylinder body, effectively isolating the caving gangue in the goaf, and at the same time ensuring that the slurry enters the liquid collection cylinder body. The structure of the present invention is simple, easy to install, has a small engineering quantity, and high data information accuracy, avoiding the cumbersome work of drilling construction and sampling, and being able to master the diffusion range of the slurry in the goaf in real time while the slurry is being filled. The device is pre-buried behind the support in advance according to a certain row and column spacing along with the mining of the working face, and the armored cable for transmitting data is connected to the ground data monitoring system in advance by using the roadway of the working face, forming a slurry diffusion monitoring system.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gangue slurry filling in coal mines, and specifically to a device and method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process. Background Technique

[0002] In recent years, the slurry filling technology mainly aimed at treating coal gangue solid waste has been increasingly applied in domestic coal mines. During the slurry filling process, the diffusion range of the slurry has a great influence on the single-hole filling volume and filling step distance, directly affecting the determination of the key parameters of the slurry filling system. However, due to the technological characteristics of this technology, grouting filling is carried out in the caving space of the goaf after the working face is mined, so it is impossible to directly observe the flow range of the slurry.

[0003] Traditional technical means can peep into the goaf by constructing peepholes on the side of the coal pillar to observe whether the slurry flows to the peep position. However, this method has a complex process, a large amount of engineering work, a large randomness of the observation results, and can only observe the area near the coal pillar, and it is impossible to grasp the diffusion situation of the slurry inside the entire working face.

[0004] Therefore, developing a device for monitoring the diffusion range of slurry inside a goaf during the slurry filling process, which can realize real-time monitoring of the diffusion range of the slurry inside the entire goaf, is of great significance for determining the key parameters of slurry filling and can further improve the slurry filling technology system. Summary of the Invention

[0005] Aiming at the problem of the difficulty in detecting and sampling the caving space of the goaf behind the working face in the prior art, the present invention provides a device and method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process. The device has a simple structure and is easy to operate. It is pre-buried behind the support in advance according to a certain row and column spacing along with the mining of the working face, and the armored cable for transmitting data is connected to the ground data monitoring system in advance through the working face roadway to form a slurry diffusion monitoring system to real-time monitor the flow range of the slurry in the goaf.

[0006] The present invention is realized through the following technical solutions:

[0007] A device for monitoring the diffusion range of slurry inside a goaf during the slurry filling process, including the main body of the slurry diffusion range monitoring device. The main body of the slurry diffusion range monitoring device includes a liquid collection cylinder, a liquid density monitoring device, and a slurry permeable plate;

[0008] The slurry permeable plate is installed on the top of the liquid collection cylinder, and a number of slurry permeable holes are arranged along the side wall of the liquid collection cylinder;

[0009] The liquid density monitoring device is arranged inside the liquid collecting cylinder body, and the power supply end of the liquid density monitoring device is connected to the ground data monitoring system through an armored cable and the liquid collecting cylinder body.

[0010] Preferably, the liquid collecting cylinder body has a funnel structure, and the area of the top of the liquid collecting cylinder body is larger than the area of the bottom of the liquid collecting cylinder body.

[0011] Furthermore, the area of the permeable grout board body is correspondingly set to the area of the top of the liquid collecting cylinder body.

[0012] Preferably, the permeable grout board has a mesh board structure.

[0013] Preferably, the bottom of the liquid collecting cylinder body is assembled on a fixed base, and a round hole is provided at the center of the fixed base, and the bottom of the liquid collecting cylinder body is inserted into the round hole.

[0014] Furthermore, a cable channel is provided inside the fixed base, and the armored cable connecting the liquid density monitoring device is connected to the ground data monitoring system along the cable channel.

[0015] Furthermore, a plurality of permeable grout holes are provided along the side wall of the round hole on the fixed base, and the plurality of permeable grout holes communicate with the plurality of permeable grout holes on the side wall of the liquid collecting cylinder body.

[0016] Preferably, the inside of the permeable grout hole is provided with a mesh structure.

[0017] A method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process, based on the above-mentioned device for monitoring the diffusion range of slurry inside a goaf during the slurry filling process, is characterized by including the following steps:

[0018] During the coal face mining process, as the support is pushed forward, slurry diffusion range monitoring units are arranged at a certain interval behind the support inside the goaf to form a slurry diffusion monitoring system. The single-row slurry diffusion range monitoring units are arranged parallel to the coal face, and the arrangement form is a rhombus; a plurality of slurry diffusion range monitoring device bodies are provided in each row of slurry diffusion range monitoring units, and each slurry diffusion range monitoring device body is a measuring point, and the data of each row of measuring points is transmitted to the ground data monitoring system through an armored cable;

[0019] When slurry filling is carried out behind the coal face, the slurry is made to flow in the voids of the caving rocks in the goaf by relying on the grouting pressure and gravity;

[0020] After the coal face is filled with slurry, when the slurry flows into the liquid collecting cylinder body through the permeable grout board, the ground data monitoring system is used to monitor the density data of each measuring point in real time to obtain the diffusion range and distribution form of the slurry in the goaf.

[0021] Preferably, the monitoring method of the ground data monitoring system is as follows:

[0022] When the liquid density detected by the liquid density monitoring device in the liquid collecting cylinder is greater than the density of mine water, the slurry diffuses to this measuring point.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] The present invention provides a monitoring device for the diffusion range of slurry inside a goaf during the slurry filling process. Inside the goaf, the slurry seeps into the liquid collecting cylinder. The change in the liquid density inside the cylinder is monitored in real time through the liquid density monitoring device, and the monitoring data is transmitted to the ground data monitoring system in real time through the armored cable. The permeable slurry plate is installed on the top of the liquid collecting cylinder, effectively isolating the caving gangue in the goaf and at the same time ensuring that the slurry enters the liquid collecting cylinder. The structure of the present invention is simple, easy to install, has a small amount of engineering work, high accuracy of data information, avoids the cumbersome work of drilling construction and sampling, and can master the diffusion range of the slurry in the goaf in real time while the slurry is being filled.

[0025] Further, the liquid collecting cylinder has a funnel structure, and the area of the top of the liquid collecting cylinder is larger than the area of the bottom of the liquid collecting cylinder, which is convenient for containing the slurry and preventing the slurry from flowing out.

[0026] Furthermore, the plate area of the permeable slurry plate is correspondingly set to the area of the top of the liquid collecting cylinder, preventing the caving gangue in the goaf from falling into the liquid collecting cylinder and affecting the monitoring results of the liquid density monitoring device.

[0027] Further, the permeable slurry plate has a mesh plate structure, which plays a role in isolating the caving gangue in the goaf and at the same time ensuring that the slurry flows into the liquid collecting cylinder.

[0028] Further, the bottom of the liquid collecting cylinder is assembled on the fixed base, and a round hole is provided in the center of the fixed base. The bottom of the liquid collecting cylinder is inserted into the round hole, improving the stability of the placement of the liquid collecting cylinder.

[0029] Further, a cable channel is provided inside the fixed base. The armored cable connecting the liquid density monitoring device is connected to the ground data monitoring system along the cable channel, facilitating the connection of the armored cable from the bottom of the liquid collecting cylinder along the cable channel inside the fixed base to the ground data monitoring system, saving the use space and improving the overall detection effect of the ground data monitoring system.

[0030] Further, a number of permeable slurry holes are provided along the side wall of the round hole on the fixed base, and the number of permeable slurry holes on the side wall of the liquid collecting cylinder is communicated with them, playing a role in isolating the caving gangue in the goaf and at the same time ensuring that the slurry flows into the liquid collecting cylinder.

[0031] Further, the inside of the permeable slurry hole is provided with a mesh structure, playing a role in isolating the caving gangue in the goaf and at the same time ensuring that the slurry flows into the liquid collecting cylinder.

[0032] A method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process. During the advancement of the support, slurry diffusion range monitoring units are arranged at a certain interval behind the support. The single-row slurry diffusion range monitoring units are arranged parallel to the working face. The body of each slurry diffusion range monitoring device is a measuring point. The data of each column of measuring points is transmitted to the ground data monitoring system through armored cables. The ground data monitoring system makes judgments based on the data monitored by each measuring point, improving the overall efficiency of monitoring and providing data support for studying the diffusion law of gangue slurry in the goaf and further optimizing the key filling parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. is a three-dimensional structural schematic diagram of the monitoring device for the diffusion range of slurry inside a goaf during the slurry filling process in the present invention;

[0034] Figure 2 FIG. is a top-view structural schematic diagram of the monitoring device for the diffusion range of slurry inside a goaf during the slurry filling process in the present invention;

[0035] Figure 3 FIG. is a side-view sectional schematic diagram of the monitoring device for the diffusion range of slurry inside a goaf during the slurry filling process in the present invention;

[0036] Figure 4 FIG. is a plan view of the monitoring system for the slurry diffusion range formed by the grouped arrangement of the monitoring device of the present invention inside the goaf.

[0037] In the figures: 1 - liquid collection cylinder body; 2 - fixed base; 3 - liquid density monitoring device; 4 - slurry permeation hole; 5 - slurry permeation plate; 6 - armored cable; 7 - body of the slurry diffusion range monitoring device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] The present invention is described in further detail below with reference to the accompanying drawings:

[0041] See also Figure 1 In one embodiment of the present invention, a device for monitoring the slurry diffusion range inside the goaf during the slurry filling process is provided. The device has a simple structure and is easy to operate. It is pre-buried behind the support at a certain interval as the working face is mined, and the armored cable for transmitting data is connected to the ground data monitoring system in advance through the working face tunnel to form a slurry diffusion monitoring system to monitor the slurry flow range of the goaf in real time.

[0042] Specifically, the slurry diffusion range monitoring device includes a slurry diffusion range monitoring device body 7, and the slurry diffusion range monitoring device body 7 includes a liquid collecting cylinder 1, a liquid density monitoring device 3 and a slurry permeable plate 5;

[0043] The slurry plate 5 is installed on the top of the liquid collecting cylinder 1 to isolate the goaf from the collapsed gangue while ensuring that the slurry enters the liquid collecting cylinder 1. A number of slurry holes 4 are arranged along the side wall of the liquid collecting cylinder 1.

[0044] The liquid density monitoring device 3 is provided inside the liquid collecting cylinder 1 and is used to transmit density sensor data in the liquid collecting cylinder 1 . The power supply end of the liquid density monitoring device 3 is connected to the ground data monitoring system via the armored cable 6 through the liquid collecting cylinder 1 .

[0045] Specifically, the liquid collecting cylinder 1 is in a funnel structure, and the top area of the liquid collecting cylinder 1 is larger than the bottom area of the liquid collecting cylinder 1, so as to facilitate the storage of the slurry and prevent the slurry from flowing out.

[0046] Specifically, the area of the pulp-permeable plate 5 is set corresponding to the top area of the liquid collecting cylinder 1, such as Figure 2 As shown, it is possible to prevent the gangue from falling into the liquid collecting cylinder 1 and affecting the monitoring result of the liquid density monitoring device 3.

[0047] Specifically, the grout-permeable plate 5 is in a mesh plate structure, which plays a role in isolating the caving gangue in the gob area while ensuring that the grout flows into the liquid collection cylinder body.

[0048] Specifically, according to Figure 3 As shown, the bottom of the liquid collection cylinder body 1 is assembled on the fixed base 2. A circular hole is provided in the center of the fixed base 2, and the bottom of the liquid collection cylinder body 1 is inserted into the circular hole, improving the stability of the placement of the liquid collection cylinder body.

[0049] Among them, a cable channel is provided in the fixed base 2. The armored cable 6 connecting the liquid density monitoring device 3 is connected to the ground data monitoring system along the cable channel, facilitating the connection of the armored cable 6 from the bottom of the liquid collection cylinder body 1 along the cable channel in the fixed base 2 to the ground data monitoring system, saving the use space and improving the overall detection effect of the ground data monitoring system.

[0050] A number of grout-permeable holes 4 are provided along the side wall of the circular hole on the fixed base 2. The number of grout-permeable holes 4 communicates with the number of grout-permeable holes 4 on the side wall of the liquid collection cylinder body 1, playing a role in isolating the caving gangue in the gob area while ensuring that the grout flows into the liquid collection cylinder body.

[0051] Specifically, the grout-permeable hole 4 is provided with a mesh structure inside, playing a role in isolating the caving gangue in the gob area while ensuring that the grout flows into the liquid collection cylinder body.

[0052] In summary, the present invention provides a monitoring device for the diffusion range of internal slurry in the gob area during the slurry filling process. Inside the gob area, the slurry seeps into the liquid collection cylinder body. The change in the liquid density inside the cylinder body is monitored in real time through the liquid density monitoring device, and the monitoring data is transmitted to the ground data monitoring system in real time through the armored cable. The grout-permeable plate is installed on the top of the liquid collection cylinder body, effectively isolating the caving gangue in the gob area while ensuring that the slurry enters the liquid collection cylinder body. The structure of the present invention is simple, easy to install, has a small engineering quantity, high data information accuracy, avoids the cumbersome work of drilling construction and sampling, and can master the diffusion range of the slurry in the gob area in real time while filling the slurry.

[0053] The present invention also provides a method for monitoring the diffusion range of internal slurry in the gob area during the slurry filling process. Based on the above-mentioned monitoring device for the diffusion range of internal slurry in the gob area during the slurry filling process, it includes the following steps:

[0054] According to Figure 4As shown in the figure, during the mining process of the working face, with the advancement of the support, slurry diffusion range monitoring units are arranged at a certain interval behind the support to form a slurry diffusion monitoring system inside the goaf. The single-row slurry diffusion range monitoring units are arranged parallel to the working face in a diamond shape; several slurry diffusion range monitoring device bodies 7 are provided in each row of slurry diffusion range monitoring units, and each slurry diffusion range monitoring device body 7 is a measuring point. The data of each row of measuring points is transmitted to the ground data monitoring system through armored cables 6;

[0055] When slurry filling is carried out behind the working face, the slurry flows in the voids of the caved rocks in the goaf by relying on the grouting pressure and gravity;

[0056] After the slurry filling of the working face, when the slurry flows into the liquid collection cylinder body 1 through the slurry permeable plate 5, the ground data monitoring system is used to monitor the density data of each measuring point in real time to obtain the diffusion range and distribution form of the slurry in the goaf.

[0057] Specifically, the monitoring method of the ground data monitoring system is as follows:

[0058] When the liquid density detected by the liquid density monitoring device 3 in the liquid collection cylinder body 1 is greater than the density of mine water, the slurry has diffused to this measuring point.

[0059] Embodiment

[0060] In a certain coal mine working face, the gangue in the coal mine production process is being disposed of by using the slurry filling method. The length of the filling working face is 300m. The density of mine water is 1.05t / m3, the mass concentration of the slurry is 70%, and the density is 1.7t / m3. In order to further optimize the key parameters of slurry filling, it is decided to monitor the diffusion range during the slurry filling process.

[0061] For a slurry diffusion monitoring system inside the goaf constructed by using a device for monitoring the slurry diffusion range inside the goaf during the slurry filling process of the present invention, the system is jointly constructed by several monitoring devices and several groups of armored transmission cables.

[0062] Among them, the monitoring device body 7 for the slurry diffusion range includes a liquid collection cylinder 1, a liquid density monitoring device 3, and a slurry permeable plate 5. The liquid collection cylinder 1 is funnel-shaped, with a slurry permeable plate 5 arranged on its upper part to isolate the caving gangue in the goaf while ensuring that the slurry enters the liquid collection cylinder 1. A number of slurry permeable holes 4 are arranged on the side wall of the cylinder, and the slurry permeable holes are evenly arranged along the axial direction of the barrel wall. A liquid density monitoring device 3 is vertically arranged inside the liquid collection cylinder 1 to monitor the change of the liquid density inside the cylinder. The fixed base 2 is annularly connected to the liquid collection cylinder 1. A number of slurry permeable holes 4 are evenly distributed on the outside of the fixed base 2 and communicate with the slurry permeable holes inside the liquid collection cylinder. A armored cable channel is arranged on the fixed base 2. The armored cable 6 is used to transmit the density sensor data inside the liquid collection cylinder. Each group of monitoring devices shares one armored cable, and the cable data is transmitted to the ground data monitoring system.

[0063] The monitoring device body 7 for the slurry diffusion range needs to be pre-buried in groups in the goaf during the working face mining process to form a monitoring system. Single monitoring devices are arranged in rows parallel to the working face. The arrangement spacing of the monitoring devices in each row is 30 m, and the spacing between adjacent two rows is 30 m. The arrangement form of the monitoring devices is a rhombus.

[0064] The liquid density monitoring device 3 inside the monitoring device body 7 for the slurry diffusion range can monitor the change of the liquid density inside the liquid collection cylinder 1 in real time. When the density test value is greater than 1.05 t / m3, it is considered that the slurry has diffused to the position of this measuring point.

[0065] The layout and working process of the monitoring system for the slurry diffusion range inside the goaf during the slurry filling process are as follows:

[0066] 1. During the working face mining process, with the pushing of the support, the monitoring devices for the slurry diffusion range are set at a spacing of 30.0 m behind the support. Single monitoring devices are arranged in rows parallel to the working face, and the arrangement form is a rhombus. Each monitoring device is a measuring point, and the data of each row of measuring points is transmitted to the ground data monitoring system by one armored cable.

[0067] 2. The goaf behind the working face is filled with slurry, so that the slurry flows in the voids of the caving rocks in the goaf by relying on the grouting pressure and gravity to achieve the purpose of harmless treatment of the gangue.

[0068] 3. After the working face is filled with slurry, use the ground data monitoring system to monitor the density data of each measuring point in real time. If the liquid density read by the monitoring device is greater than the density of the mine water, it is considered that the slurry has diffused to this measuring point. According to the monitoring results of all measuring points in the goaf, the diffusion range and distribution form of the slurry in the goaf are comprehensively analyzed.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific implementation manners of the present invention, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A monitoring system for the diffusion range of slurry inside a gob area during the slurry filling process, characterized in that, During the working face coal mining process, slurry diffusion range monitoring units are arranged at a certain interval to form a slurry diffusion monitoring system inside the goaf. In each column of slurry diffusion range monitoring units, there are several slurry diffusion range monitoring device bodies (7). The slurry diffusion range monitoring device body (7) includes a liquid collection cylinder body (1), a liquid density monitoring device (3), and a slurry permeable plate (5). The slurry permeable plate (5) is installed on the top of the liquid collection cylinder body (1), and several slurry permeable holes (4) are arranged along the side wall of the liquid collection cylinder body (1). The liquid density monitoring device (3) is arranged inside the liquid collection cylinder body (1). The power supply end of the liquid density monitoring device (3) is connected to the ground data monitoring system through an armored cable (6) via the liquid collection cylinder body (1). The liquid collection cylinder body (1) is in a funnel structure, and the area of the top of the liquid collection cylinder body (1) is larger than the area of the bottom of the liquid collection cylinder body (1). The slurry permeable plate (5) is in a mesh plate structure. The bottom of the liquid collection cylinder body (1) is assembled on a fixed base (2). A round hole is provided in the center of the fixed base (2), and the bottom of the liquid collection cylinder body (1) is inserted into the round hole for setting. A cable channel is provided inside the fixed base (2), and the armored cable (6) connecting the liquid density monitoring device (3) is connected to the ground data monitoring system along the cable channel. The area size of the plate body of the slurry permeable plate (5) is correspondingly set to the area size of the top of the liquid collection cylinder body (1). Several slurry permeable holes (4) are provided along the side wall of the round hole on the fixed base (2), and the several slurry permeable holes (4) on the side wall of the fixed base (2) are communicated with the several slurry permeable holes (4) on the side wall of the liquid collection cylinder body (1). The inside of the slurry permeable hole (4) is arranged in a mesh structure.

2. A method for monitoring the diffusion range of slurry inside a goaf during the slurry filling process, based on the monitoring system for the diffusion range of slurry inside a goaf during the slurry filling process as claimed in claim 1, characterized in that It includes the following steps: During the working face coal mining process, as the support is pushed, slurry diffusion range monitoring units are arranged at a certain interval behind the support to form a slurry diffusion monitoring system inside the goaf. The single-column slurry diffusion range monitoring units are arranged parallel to the working face in a diamond shape. In each column of slurry diffusion range monitoring units, there are several slurry diffusion range monitoring device bodies (7). Each slurry diffusion range monitoring device body (7) is a measuring point, and the data of each column of measuring points is transmitted to the ground data monitoring system through an armored cable (6). When slurry filling is carried out behind the working face, the slurry flows in the voids of the caved rocks in the goaf by relying on the grouting pressure and gravity. After the slurry filling of the working face, when the slurry flows into the liquid collection cylinder body (1) through the slurry permeable plate (5), the ground data monitoring system is used to monitor the density data of each measuring point in real time to obtain the diffusion range and distribution form of the slurry in the goaf.

3. A method for monitoring the diffusion range of slurry inside a mined-out area during paste filling, according to claim 2, characterized in that The monitoring method of the ground data monitoring system is as follows: When the liquid density detected by the liquid density monitoring device (3) in the liquid collection cylinder body (1) is greater than the density of mine water, the slurry has diffused to this measuring point.

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