阅读说明：本技术 一种角联结构矿井煤尘爆炸传播特性测试装置及测试方法 (Device and method for testing mine coal dust explosion propagation characteristics of angle joint structure ) 是由 刘天奇 王宁 李雨成 蔡之馨 孙睿成 于 2020-11-13 设计创作，主要内容包括：一种角联结构矿井煤尘爆炸传播特性测试装置及测试方法,包括煤尘喷射装置、管体吹扫装置、弯管接头及分叉管接头,所述煤尘喷射装置通过管体与分叉管接头Ⅰ的第一接头连接,分叉管接头Ⅰ与煤尘喷射装置之间的管体上安装有点火装置,分叉管接头Ⅰ的第二接头和第三接头分别通过管体与弯管接头Ⅰ和弯管接头Ⅱ一端连接,另一端通过中间管体分别与弯管接头Ⅲ和弯管接头Ⅳ一端连接,弯管接头Ⅲ和弯管接头Ⅳ另一端分叉管接头Ⅱ的第二接头和第三接头连接,分叉管接头Ⅱ第一接头通过管体与管体吹扫装置连接,点火装置至管体吹扫装置之间的管体及中间管体上设置有传感器组。本发明矿井煤尘爆炸传播特性测试装置,结构简单,能够开展并联或角联空间煤尘的一次、二次爆炸。(A device and a method for testing the coal dust explosion propagation characteristics of a mine with an angle joint structure comprise a coal dust injection device, a pipe body blowing device, a bent pipe joint and a bifurcated pipe joint, the coal dust injection device is connected with a first joint of a bifurcated pipe joint I through a pipe body, an ignition device is installed on the pipe body between the bifurcated pipe joint I and the coal dust injection device, a second joint and a third joint of the bifurcated pipe joint I are connected with one end of a bent pipe joint I and one end of a bent pipe joint II through the pipe body respectively, the other end of the bifurcated pipe joint I is connected with one end of a bent pipe joint III and one end of a bent pipe joint IV through a middle pipe body respectively, the second joint and the third joint of the other end of the bent pipe joint III and the other end of the bent pipe joint IV are connected with a branched pipe joint II, the first joint of the bifurcated pipe joint II is connected with a pipe body sweeping device through the pipe body, and sensor groups are arranged. The mine coal dust explosion propagation characteristic testing device is simple in structure and capable of conducting primary and secondary explosion of coal dust in parallel or angle connection space.)

1. A device for testing the propagation characteristic of mine coal dust explosion with an angle connection structure is characterized by comprising a coal dust injection device, an ignition device, a pipe body purging device, a bent pipe joint and a bifurcated pipe joint, the coal dust injection device is connected with a first joint of a bifurcated pipe joint I through a pipe body, an ignition device is installed on the pipe body between the bifurcated pipe joint I and the coal dust injection device, a second joint and a third joint of the bifurcated pipe joint I are connected with one end of a bent pipe joint I and one end of a bent pipe joint II through the pipe body respectively, the other end of the bifurcated pipe joint I is connected with one end of a bent pipe joint III and one end of a bent pipe joint IV through a middle pipe body respectively, the second joint and the third joint of the other end of the bent pipe joint III and the other end of the bent pipe joint IV are connected with a branched pipe joint II, the first joint of the bifurcated pipe joint II is connected with a pipe body sweeping device through the pipe body, and sensor groups are arranged.

2. The device for testing the propagation characteristics of the coal dust explosion in the angle joint structure mine as claimed in claim 1, wherein: an angle connection branch pipe is arranged between the two middle pipe bodies and fixed through a support guide rail.

3. The device for testing the propagation characteristics of the coal dust explosion in the angle joint structure mine as claimed in claim 1, wherein: the coal dust injection device comprises a coal dust diffusion blade, a cover body, a coal dust feeding box, a coal dust feeding control valve, a fixed support, a motor, a spiral conveyor, a driving shaft and a driving shaft support frame, wherein the fixed support is arranged at the bottom end of the driving shaft support frame, the motor is fixedly installed at one end of the driving shaft support frame, the driving shaft of the motor penetrates through the driving shaft support frame to be connected with one end of the spiral conveyor, the other end of the driving shaft support frame is connected with the cover body, the coal dust diffusion blade is arranged in the cover body, a rotating shaft of the coal dust diffusion blade penetrates through the driving shaft support frame to be connected with the other end of the spiral conveyor, the top end of the hollow cylindrical section of the driving shaft support frame is provided with the coal dust feeding box communicated with the hollow cylindrical section, the bottom end of the outer side wall of the coal dust, so that an explosion is formed by the ignition device.

4. The device for testing the propagation characteristics of the coal dust explosion in the angle joint structure mine as claimed in claim 1, wherein: the ignition device comprises a stainless steel sleeve and ignition electrodes, wherein the stainless steel sleeve is symmetrically arranged at the top end and the bottom end of the tube body, the ignition electrodes are arranged in inner holes of the stainless steel sleeve, the end parts of the ignition electrodes are positioned in the tube body, and the two ignition electrodes are arranged oppositely.

5. The device for testing the propagation characteristics of the coal dust explosion in the angle joint structure mine as claimed in claim 1, wherein: the body sweeps the device and includes first diaphragm valve, manometer, second diaphragm valve, coal dust collection tank, third diaphragm valve, lateral line and vacuum pump, the lateral line is connected with first diaphragm valve, second diaphragm valve and third diaphragm valve one end respectively, and is provided with the manometer on the lateral line, and the second diaphragm valve other end is connected with the coal dust collection tank, and the third diaphragm valve other end and vacuum pump, the first diaphragm valve other end pass through the body and II first articulate of bifurcated pipe joint, and the body sweeps the device and can collect the remaining coal dust in the angle allies oneself with the pipeline through the negative pressure dust absorption principle.

6. The device for testing the propagation characteristics of the coal dust explosion in the angle joint structure mine as claimed in claim 1, wherein: the sensor group comprises a pressure sensor, a flame temperature sensor and a CO concentration sensor, wherein the pressure sensor is arranged at the top of the inner wall of the tube body, the CO concentration sensor is arranged at the bottom of the inner wall of the tube body, the pressure sensor and the CO concentration sensor are arranged right opposite to each other, the flame temperature sensor is arranged between the pressure sensor and the CO concentration sensor, and the flame temperature sensor, the CO concentration sensor and the pressure sensor are arranged in the same plane.

7. The method for testing the propagation characteristic of the coal dust explosion of the angle joint structure mine as claimed in claim 1, is characterized by comprising the following steps:

step 1, adding coal dust required by a test into a coal dust feeding box of a coal dust injection device; after the coal dust injection device is started, the motor drives the driving shaft, the spiral conveyor and the coal dust diffusion blade to start working, the coal dust inlet control valve of the coal dust feeding box is opened, the coal dust linearly flows onto the spiral conveyor from the outlet at the bottom of the coal dust feeding box and is conveyed into the cover body along with the spiral conveyor, the coal dust diffusion blade provides extra power for the coal dust in the cover body and flies out from the outlet of the cover body, suspended coal dust cloud with certain concentration can be formed in a certain space, sufficient ignition energy is provided through the ignition device, the formed suspended coal dust cloud is detonated, and accordingly explosion is propagated along the corner connecting pipeline or the parallel connecting pipeline; the design of a branched pipe joint II, an elbow joint I, an elbow joint II, an elbow joint III and an elbow joint IV of a branched pipe joint I in an angle joint pipeline can realize that coal dust explosion can be transmitted along the branched pipe joint II, the elbow joint I, the elbow joint II, the elbow joint III and the elbow joint IV of the branched pipe joint I; the angle connection branch pipe is a symbolic pipeline of an angle connection structure explosion device, an upper middle pipe body and a lower middle pipe body are communicated, and the flowing direction of airflow in the angle connection branch pipe is uncertain, so that deposited coal dust can be laid in the angle connection branch pipe in the process of testing the coal dust explosion propagation characteristic by using the device, and the research on the secondary explosion propagation characteristic of the coal dust in the angle connection space is realized; the design of a branched pipe joint II, an elbow joint I, an elbow joint II, an elbow joint III and an elbow joint IV of a branched pipe joint I in a parallel pipeline can realize the propagation of dust explosion along the branched pipe joint II, the elbow joint I, the elbow joint II, the elbow joint III and the elbow joint IV of the branched pipe joint I; the parallel branch pipes are two mutually communicated pipelines at the upper part and the lower part, so that deposited dust can be paved in the parallel middle pipe body in the process of testing the dust explosion propagation characteristic by using the device, and the research on the secondary explosion propagation characteristic of the dust in the parallel space can be realized;

step 2, after the testing process is finished, cleaning residual coal dust in the pipeline through the pipe body blowing device; closing the first diaphragm valve, opening the second diaphragm valve and the third diaphragm valve, and then starting a vacuum pump; and observing the pressure value of the pressure gauge, and when the pressure value of the pressure gauge is stable, closing the third diaphragm valve firstly, and then opening the first diaphragm valve to enable residual coal dust to be charged into the coal dust collecting tank.

Technical Field

The invention relates to the field of safety technology and engineering, in particular to a device and a method for testing the coal dust explosion propagation characteristic of a mine with an angle joint structure.

Background

At present, in retrieved related achievements at home and abroad, mine coal dust explosion devices mainly comprise international 20L spherical coal dust explosion devices, cylindrical Hartmann tubes and large tubular coal dust explosiveness testing devices, and linear pipeline testing devices, elbow pipeline testing devices, branch pipeline testing devices and the like independently developed and developed by related scientific research institutes at home and abroad.

The device is used for testing the coal dust explosion propagation characteristics, but the technical problems are as follows: at present, the existing coal dust explosion testing devices are all closed or semi-closed independent spaces, no access structure is formed, in the process of mining a mine, the connection mode between underground roadways is not a simple independent space, but is an angle connection structure which is mutually communicated, and in essence, the connection mode between the mine roadways belongs to angle connection. The research and development of the coal dust explosion device with the diagonal connection structure are rare because the research on the coal dust explosion propagation characteristic in the linear pipeline space and the 20L spherical space is the basis of the research on the coal dust explosion propagation characteristic in the pipeline space with the diagonal connection structure on one hand, and because the diagonal connection structure is relatively more complex and the mechanism research on the coal dust explosion propagation characteristic in the diagonal connection space is more difficult on the other hand, the research and development of the coal dust explosion device with the diagonal connection structure are rare.

Disclosure of Invention

Aiming at the defects of the existing coal dust explosion device research and development technology, the invention designs a device and a method for testing the coal dust explosion propagation characteristic of a mine with an angle joint structure, which can be used for testing the coal dust explosion propagation characteristic in an angle joint space.

A device for testing the propagation characteristics of coal dust explosion in a mine with an angle joint structure comprises a coal dust injection device, an ignition device, a pipe body blowing device, a bent pipe joint and a bifurcated pipe joint, the coal dust injection device is connected with a first joint of a bifurcated pipe joint I through a pipe body, an ignition device is installed on the pipe body between the bifurcated pipe joint I and the coal dust injection device, a second joint and a third joint of the bifurcated pipe joint I are connected with one end of a bent pipe joint I and one end of a bent pipe joint II through the pipe body respectively, the other end of the bifurcated pipe joint I is connected with one end of a bent pipe joint III and one end of a bent pipe joint IV through a middle pipe body respectively, the second joint and the third joint of the other end of the bent pipe joint III and the other end of the bent pipe joint IV are connected with a branched pipe joint II, the first joint of the bifurcated pipe joint II is connected with a pipe body sweeping device through the pipe body, and sensor groups are arranged.

And an angle connection branch pipe is arranged between the two middle pipe bodies and is fixed through a support guide rail, so that the vibration of the pipe bodies caused by explosion is reduced. The angle-connected branch pipe can be used for laying deposited coal dust, secondary explosion can be formed after the explosion is propagated to the angle-connected branch, and the quality, the thickness, the particle size and the spreading position of the deposited coal dust can be changed according to the requirements of test conditions.

The coal dust injection device comprises a coal dust diffusion blade, a cover body, a coal dust feeding box, a coal dust feeding control valve, a fixed support, a motor, a spiral conveyor, a driving shaft and a driving shaft support frame, wherein the fixed support is arranged at the bottom end of the driving shaft support frame, the motor is fixedly installed at one end of the driving shaft support frame, the driving shaft of the motor penetrates through the driving shaft support frame to be connected with one end of the spiral conveyor, the other end of the driving shaft support frame is connected with the cover body, the coal dust diffusion blade is arranged in the cover body, a rotating shaft of the coal dust diffusion blade penetrates through the driving shaft support frame to be connected with the other end of the spiral conveyor, the top end of the hollow cylindrical section of the driving shaft support frame is provided with the coal dust feeding box communicated with the hollow cylindrical section, the bottom end of the outer side wall of the coal dust, so that an explosion is formed by the ignition device.

The ignition device comprises a stainless steel sleeve and ignition electrodes, wherein the stainless steel sleeve is symmetrically arranged at the top end and the bottom end of the tube body, the ignition electrodes are arranged in inner holes of the stainless steel sleeve, the end parts of the ignition electrodes are positioned in the tube body, and the two ignition electrodes are arranged oppositely; the ignition device adopts a high-energy ignition device, can provide the maximum ignition energy of 10KJ, and the ignition energy, the ignition delay time and the powder spraying pressure can be changed according to the requirements of test conditions.

The body sweeps the device and includes first diaphragm valve, the manometer, the second diaphragm valve, the coal dust collection tank, the third diaphragm valve, lateral conduit and vacuum pump, lateral conduit is connected with first diaphragm valve, second diaphragm valve and third diaphragm valve one end respectively, and be provided with the manometer on lateral conduit, the second diaphragm valve other end is connected with the coal dust collection tank, the third diaphragm valve other end and vacuum pump, the first diaphragm valve other end is connected through body and II first piecings of bifurcated pipe joint, the body sweeps the device and passes through the remaining coal dust of negative pressure dust absorption principle collection in the angle allies oneself with the pipeline, also can collect to disassemble the body in addition and clear up.

The sensor group comprises a pressure sensor, a flame temperature sensor and a CO concentration sensor, wherein the pressure sensor is arranged at the top of the inner wall of the tube body, the CO concentration sensor is arranged at the bottom of the inner wall of the tube body, the pressure sensor and the CO concentration sensor are arranged right opposite to each other, the flame temperature sensor is arranged between the pressure sensor and the CO concentration sensor, the flame temperature sensor, the CO concentration sensor and the pressure sensor are arranged in the same plane, and the explosion intensity propagation data can be monitored and recorded in real time.

A testing method of a device for testing the propagation characteristics of coal dust explosion in a mine with an angle joint structure comprises the following steps:

step 1, adding coal dust required by a test into a coal dust feeding box of a coal dust injection device; after the coal dust injection device is started, the motor drives the driving shaft, the spiral conveyor and the coal dust diffusion blade to start working, the coal dust inlet control valve of the coal dust feeding box is opened, the coal dust linearly flows onto the spiral conveyor from the outlet at the bottom of the coal dust feeding box and is conveyed into the cover body along with the spiral conveyor, the coal dust diffusion blade provides extra power for the coal dust in the cover body and flies out from the outlet of the cover body, suspended coal dust cloud with certain concentration can be formed in a certain space, sufficient ignition energy is provided through the ignition device, the formed suspended coal dust cloud is detonated, and accordingly explosion is propagated along the corner connecting pipeline or the parallel connecting pipeline; the design of a branched pipe joint II, an elbow joint I, an elbow joint II, an elbow joint III and an elbow joint IV of a branched pipe joint I in an angle joint pipeline can realize that coal dust explosion can be transmitted along the branched pipe joint II, the elbow joint I, the elbow joint II, the elbow joint III and the elbow joint IV of the branched pipe joint I; the angle-connected branch pipe is a symbolic pipeline of an angle-connected explosion device, an upper middle pipe body and a lower middle pipe body which are connected in parallel are communicated, and the flowing direction of airflow in the angle-connected branch pipe is uncertain, so that deposited coal dust can be laid in the angle-connected branch pipe in the process of testing the coal dust explosion propagation characteristic by using the device, and the research on the secondary explosion propagation characteristic of the coal dust in the angle-connected space is realized; the design of a branched pipe joint II, an elbow joint I, an elbow joint II, an elbow joint III and an elbow joint IV of a branched pipe joint I in a parallel pipeline can realize the propagation of dust explosion along the branched pipe joint II, the elbow joint I, the elbow joint II, the elbow joint III and the elbow joint IV of the branched pipe joint I; the parallel branch pipes are two mutually communicated pipelines at the upper part and the lower part, so that deposited dust can be paved in the parallel middle pipe body in the process of testing the dust explosion propagation characteristic by using the device, and the research on the secondary explosion propagation characteristic of the dust in the parallel space can be realized;

step 2, after the testing process is finished, cleaning residual coal dust in the pipeline through the pipe body blowing device; closing the first diaphragm valve, opening the second diaphragm valve and the third diaphragm valve, and then starting a vacuum pump; and observing the pressure value of the pressure gauge, and when the pressure value of the pressure gauge is stable, closing the third diaphragm valve firstly, and then opening the first diaphragm valve to enable residual coal dust to be charged into the coal dust collecting tank.

The invention has the beneficial effects that:

1. the parallel structure coal dust explosion testing device provided by the invention can be used for testing the pressure and flame generated by primary explosion and secondary explosion of coal dust in parallel space and the concentration of generated CO toxic gas.

2. The device for testing the explosion of the coal dust in the angle joint structure can be used for testing the pressure, flame and generated CO toxic gas concentration generated by primary explosion and secondary explosion of the coal dust in the angle joint space.

3. The pipe body purging device comprises a negative pressure vacuum module, wherein the negative pressure vacuum module is used for vacuumizing a pipe body after an experiment is finished until the pressure value on a pressure gauge is stable, and vacuumizing is finished, so that residual coal dust in the pipe body can be completely discharged through vacuumizing, and the situation that the complex pipe body which is not easy to disassemble is difficult to clean is prevented.

4. The pipe purging device provided by the invention has the advantages of simple structure, short purging time, good effect and greatly reduced production cost.

5. The coal dust injection device has long dust generating time, uniform dust generating speed and strong operability, and has better simulation dust generating effect on various operations.

6. The device comprises a pressure sensor, a flame temperature sensor and a CO concentration sensor, wherein the three sensors are a group and can sense the integral change of coal dust explosion in the whole transmission process in real time, the data feedback is accurate and clear, the cost is increased by a limited amount compared with the original equipment provided with a single sensor, and the effect is obvious.

7. The pipe body of the coal dust explosion testing device provided by the invention is formed by splicing each small section of pipe body, so that the length of the pipe body in the testing device can be automatically changed according to the testing requirements, and the applicability is strong.

Drawings

FIG. 1 is a top view of a mine coal dust explosion propagation characteristic testing device in embodiment 1 of the present invention;

FIG. 2 is an isometric view of a coal dust injection device of the mine coal dust explosion propagation characteristic testing device in the embodiment 1 of the invention;

FIG. 3 is a sectional view of a coal dust injection device of the mine coal dust explosion propagation characteristic testing device in example 1 of the present invention;

FIG. 4 is a schematic view of an ignition device of a mine coal dust explosion propagation characteristic testing device in embodiment 1 of the invention;

fig. 5 is a schematic view of a pipe purging device of a mine coal dust explosion propagation characteristic testing device in embodiment 1 of the invention;

FIG. 6 is a top view of a mine coal dust explosion propagation characteristic testing device in embodiment 2 of the present invention;

1-a coal dust injection device, 101-a coal dust diffusion blade, 102-a cover body, 103-a coal dust feeding box, 104-a coal dust inflow control valve, 105-a fixed support, 106-a motor, 107-a screw conveyor, 108-a driving shaft, 109-a driving shaft support frame, 2-an ignition device, 201-a stainless steel sleeve, 202-an ignition electrode, a 3-an angle joint branch pipe, 4-a pipe body purging device, 401-a first diaphragm valve, 402-a pressure gauge, 403-a second diaphragm valve, 404-a coal dust collecting tank, 405-a third diaphragm valve, 406-a branch pipeline, 407-a vacuum pump, 501-an elbow joint I, 502-an elbow joint II, 503-an elbow joint III, 504-an elbow joint IV and 601-a branch pipe joint I, 602-furcation tube joint II.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 to 5, an apparatus for testing the propagation characteristics of coal dust explosion in a mine with an angle joint structure comprises a coal dust injection device 1, an ignition device 2, a pipe purging device 4, a bent pipe joint and a bifurcated pipe joint, wherein the coal dust injection device 1 is connected with one end of a pipe body through a flange, the other end of the pipe body is connected with a first joint of the bifurcated pipe joint i 601 through a flange, the ignition device 2 is installed on the pipe body between the bifurcated pipe joint i 601 and the coal dust injection device 1, a second joint and a third joint of the bifurcated pipe joint i 601 are respectively connected with one ends of the bent pipe joint i 501 and the bent pipe joint ii 502 through a pipe body and a flange, the other ends of the bent pipe joint iii 503 and the bent pipe joint iv 504 are respectively connected with a second joint and a third joint of the bifurcated pipe joint ii 602 through an intermediate pipe body and a flange, the first joint of the bifurcated pipe joint II 602 is connected with the pipe body purging device 4 through a pipe body and a flange plate, and a sensor group is arranged on the pipe body between the ignition device 2 and the pipe body purging device 4 and the middle pipe body.

The coal dust injection device 1 comprises a coal dust diffusion blade 101, a cover body 102, a coal dust feeding box 103, a coal dust feeding control valve, a fixed support 105, a motor 106, a screw conveyor 107, a driving shaft 108 and a driving shaft support frame 109, wherein the bottom end of the driving shaft support frame 109 is provided with the fixed support 105, one end of the driving shaft support frame 109 is fixedly provided with the motor 106, the driving shaft 108 of the motor 106 penetrates through the driving shaft support frame 109 to be connected with one end of the screw conveyor 107, the other end of the driving shaft support frame 109 is connected with one end of the cover body 102, the coal dust diffusion blade 101 is arranged in the cover body 102, the rotating shaft of the coal dust diffusion blade 101 penetrates through the driving shaft support frame 109 to be connected with the other end of the screw conveyor 107, the top end of the hollow cylindrical section of the driving shaft support frame 109 is provided with the coal dust feeding box 103 communicated with the driving shaft, the coal dust injection device 1 is used for injecting coal dust into a pipeline at a certain pressure so as to form an explosion under the action of the ignition device 2.

The ignition device 2 comprises a stainless steel sleeve 201 and ignition electrodes 202, the stainless steel sleeve 201 is symmetrically arranged at the top end and the bottom end of the tube body, the ignition electrodes 202 are arranged in inner holes of the stainless steel sleeve 201, the end parts of the ignition electrodes 202 are positioned in the tube body, and the two ignition electrodes 202 are arranged oppositely; the ignition device 2 adopts a high-energy ignition device 2, the maximum ignition energy of 10KJ can be provided, and the ignition energy, the ignition delay time and the powder spraying pressure can be changed according to the requirements of test conditions.

The pipe body purging device 4 comprises a first diaphragm valve 401, a pressure gauge 402, a second diaphragm valve 403, a coal dust collecting tank 404, a third diaphragm valve 405, a branch pipeline 406 and a vacuum pump 407, the branch pipeline 406 is respectively connected with one end of the first diaphragm valve 401, one end of the second diaphragm valve 403 and one end of the third diaphragm valve 405, the other end of the second diaphragm valve 403 is connected with the coal dust collecting tank 404, the pressure gauge 402 is arranged on the branch pipeline 406, the other end of the third diaphragm valve 405 is connected with the vacuum pump 407, the other end of the first diaphragm valve 401 is connected with a first connector of a branch pipe connector II 602 through a pipe body, and the pipe body purging device 4 can collect residual coal dust in a dust collection principle corner connecting pipeline through negative pressure or can clean the residual coal dust.

The interval between two adjacent sensor groups is 0.2m, and the sensor group includes pressure sensor, flame temperature sensor and CO concentration sensor, pressure sensor is located the setting of body inner wall top, and CO concentration sensor is located the setting of body inner wall bottom, and pressure sensor and CO concentration sensor are just setting up, is provided with flame temperature sensor between pressure sensor and the CO concentration sensor, and flame temperature sensor, CO concentration sensor and pressure sensor are located the coplanar, but real-time supervision and record explosion intensity propagation data.

A testing method of a device for testing the propagation characteristics of coal dust explosion in a mine with an angle joint structure comprises the following steps:

step 1, adding coal dust required by a test into a coal dust feeding box 103 of a coal dust injection device 1; after the coal dust injection device 1 is started, the motor 106 drives the driving shaft 108, the spiral conveyor 107 and the coal dust diffusion blade 101 to start working, the coal dust inlet control valve 104 of the coal dust feeding box 103 is opened, coal dust linearly flows onto the spiral conveyor 107 from the bottom outlet of the coal dust feeding box 103 and is conveyed into the cover body 102 along with the spiral conveyor 107, the coal dust diffusion blade 101 provides extra power for the coal dust in the cover body 102 and flies out from the outlet of the cover body 102, suspended coal dust cloud with certain concentration can be formed in a certain space, sufficient ignition energy is provided through the ignition device 2, the formed suspended coal dust cloud is detonated, and accordingly explosion is propagated along the angle connecting pipeline or the parallel connecting pipeline; the design of the branched pipe joint I601, the branched pipe joint II 602, the elbow joint I501, the elbow joint II 502, the elbow joint III 503 and the elbow joint IV 504 in the parallel pipeline can realize the propagation of dust explosion along the branched pipe joint II 602, the elbow joint I501, the elbow joint II 502, the elbow joint III 503 and the elbow joint IV 504 of the branched pipe joint I601; the parallel branch pipes are two mutually communicated pipelines at the upper part and the lower part, so that deposited dust can be paved in the parallel middle pipe body in the process of testing the dust explosion propagation characteristic by using the device, the research on the secondary explosion propagation characteristic of the dust in a parallel space is realized, and meanwhile, the pressure, the CO concentration and the flame temperature in the pipe body are monitored in real time by the pressure sensor, the CO concentration sensor and the flame temperature sensor;

step 2, after the testing process is finished, cleaning residual coal dust in the pipeline through the pipe body blowing device 4; closing the first diaphragm valve 401, opening the second diaphragm valve 403 and the third diaphragm valve 405, and then starting the vacuum pump 407; and (3) observing the pressure value of the pressure gauge 402, and when the pressure value of the pressure gauge 402 is stabilized at-14.7 psi, closing the third diaphragm valve 405 and then opening the first diaphragm valve 401 to charge residual coal dust into the coal dust collecting tank 404.

Example 2

As shown in fig. 6, embodiment 2 is different from embodiment 1 in that an angle branch pipe 3 is provided between two intermediate pipe bodies in embodiment 2, and the angle branch pipe 3 is fixed by a bracket rail to reduce vibration of the pipe body due to explosion. The angle-connected branch pipe 3 can be used for laying deposited coal dust, secondary explosion can be formed after the explosion is propagated to the angle-connected branch, and the quality, the thickness, the particle size and the spreading position of the deposited coal dust can be changed according to the requirements of test conditions.

A testing method of a device for testing the propagation characteristics of coal dust explosion in a mine with an angle joint structure comprises the following steps:

step 1, adding coal dust required by a test into a coal dust feeding box 103 of a coal dust injection device 1; after the coal dust injection device 1 is started, the motor 106 drives the driving shaft 108, the spiral conveyor 107 and the coal dust diffusion blade 101 to start working, the coal dust inlet control valve 104 of the coal dust feeding box 103 is opened, coal dust linearly flows onto the spiral conveyor 107 from the bottom outlet of the coal dust feeding box 103 and is conveyed into the cover body 102 along with the spiral conveyor 107, the coal dust diffusion blade 101 provides extra power for the coal dust in the cover body 102 and flies out from the outlet of the cover body 102, suspended coal dust cloud with certain concentration can be formed in a certain space, sufficient ignition energy is provided through the ignition device 2, the formed suspended coal dust cloud is detonated, and accordingly explosion is propagated along the angle connecting pipeline or the parallel connecting pipeline; the design of the branched pipe joint I601, the branched pipe joint II 602, the elbow joint I501, the elbow joint II 502, the elbow joint III 503 and the elbow joint IV 504 in the angle joint pipeline can realize that the coal dust explosion can be transmitted along the branched pipe joint II 602, the elbow joint I501, the elbow joint II 502, the elbow joint III 503 and the elbow joint IV 504 of the branched pipe joint I601; the angle-connected branch pipe 3 is a symbolic pipeline of an angle-connected explosion device, an upper pipeline and a lower pipeline are communicated, and the flow direction of air flow in the angle-connected branch pipe 3 is uncertain, so that deposited coal dust can be laid in the angle-connected branch pipe 3 in the process of testing the coal dust explosion propagation characteristic by using the device, the research on the secondary explosion propagation characteristic of the coal dust in an angle-connected space is realized, and meanwhile, the pressure, the CO concentration and the flame temperature in a pipe body are monitored in real time through a pressure sensor, a CO concentration sensor and a flame temperature sensor;

step 2, after the testing process is finished, cleaning residual coal dust in the pipeline through the pipe body blowing device 4; closing the first diaphragm valve 401, opening the second diaphragm valve 403 and the third diaphragm valve 405, and then starting the vacuum pump 407; and (3) observing the pressure value of the pressure gauge 402, and when the pressure value of the pressure gauge 402 is stable, closing the third diaphragm valve 405 and then opening the first diaphragm valve 401 to enable residual coal dust to be filled into the coal dust collecting tank 404.