Dust pressing plate monitoring and box-type closed dust removal device for the transfer area of mine scraper conveyors

Abstract

The dust pressing plate monitoring and box-type closed dust removal device for the mine scraper transportation transfer area of the present invention includes two modules, namely dust pressing plate monitoring and box-type closed dust removal, aiming to achieve dust monitoring and closed dust removal in the transfer area. The dust pressing plate monitoring module is equipped with a dust concentration monitoring plate on the wall surface of the closed box body, including a super-hydrophobic wear-resistant film, a piezoelectric film sensor, etc. The device converts the pressure signal of the dust hitting the monitoring plate into an electrical signal, and divides four response levels according to the magnitude of the force, namely low-concentration green warning, medium-concentration yellow purification, high-concentration orange dust removal, and ultra-concentration red evacuation. The box-type closed dust removal module is divided into atomization infiltration type and negative pressure collection type dust removal. The atomization infiltration type uses atomizing nozzles, water curtains and porous water washing devices to infiltrate and remove dust, and the negative pressure collection type uses piston movement to generate negative pressure to collect dust. The required liquid-phase and gas-phase working fluids of the device are supplied by ground static pressure water and mine ventilation ducts respectively.

Description

Technical Field

[0001] The dust pressing plate monitoring and box-type closed dust removal device for the scraper conveyor transfer area of the present invention relates to the dust concentration monitoring and dust removal in the transfer area of the scraper conveyor during the underground coal transfer process. Technical Background

[0002] In the process of underground coal transfer, the scraper conveyor is often used to transfer coal blocks. During this process, the normal operation of the scraper conveyor will give the scraper a certain speed, and there is a height difference of 500-1000 mm in the transfer area. Therefore, during the coal flow transfer in the transfer area, some coal dust diffuses around. The limited space and ventilation conditions in the underground roadway make the air circulation underground unable to reach the ground ventilation state, and the dust formed in the transfer area cannot be transferred to other areas by roadway ventilation in a short time, and the dust concentration in the local area will continue to increase. In actual underground operations, the scraper conveyor is in a long-term running state, so dust will be continuously generated in the transfer area, seriously polluting the working environment. Dust is a common factor endangering the life safety of workers in the coal mine transfer process, and it will pose a great threat to the physical health of underground workers. Since dust with a smaller particle size is extremely easy to penetrate into the lungs, causing coal worker's pneumoconiosis or silicosis, the probability of lung cancer in workers exposed to such working conditions for a long time will increase greatly, bringing great challenges to the personnel safety protection work. In addition, the wear of underground mechanical equipment will be aggravated under the influence of mine dust, resulting in a shortened normal service time of precision instruments, and even causing explosion accidents in some cases. Considering comprehensively, it is very necessary to carry out dust monitoring and dust removal work in the transfer area.

[0003] Analyze the current coal mine dust removal methods. For the dust treatment method in the transfer area of the mine scraper conveyor, the spray dust removal method is mainly used. Considering the actual situation that the coal mine collection points are deep underground, the deficiencies of the existing spray dust removal methods are considered from two aspects. On the one hand, the water quality in the mine is relatively hard and shows the characteristics of high calcification, and the nozzles are prone to blockage, affecting the dust removal effect; on the other hand, when the coal flow falls in the transfer area, large coal blocks may collide with the nozzles and damage them. Using nozzles for water mist dust removal focuses on increasing the number of nozzles to seek better water mist effects. Such methods have a certain effect on removing the dust generated in the transfer area, but there are deficiencies. In reality, the dust generation process is continuous, and the dust generation amount is non-uniform. Conventional water mist dust removal does not achieve a graded response to the dust generation amount, resulting in too little water mist amount in some time periods to achieve the expected dust removal effect, and too much water mist amount in some time periods, wasting water resources. Moreover, only using water mist nozzles to achieve the purpose of dust removal, the means are relatively single, and it is difficult to further improve the dust removal efficiency. In this current situation, aiming to solve the problems of dust monitoring graded response and efficient dust removal in the transfer area, and also to achieve the efficient utilization of energy, the present invention provides a dust pressing plate monitoring and box-type closed dust removal device for the transfer area of the mine scraper conveyor. It realizes the monitoring and grading of the dust amount in the transfer area and closed dust removal, protects the health of the personnel at the operation point, ensures the normal working efficiency, and reduces the probability of occupational diseases. Summary of the Invention

[0004] In view of this, the present invention provides a dust pressing plate monitoring and box-type closed dust removal device for the transfer area of the mine scraper conveyor, realizing the purpose of dust monitoring graded response and closed dust removal in the transfer area, protecting the health of the personnel at the work point, and improving the underground environment. To achieve the above expectations, the technical solutions adopted in the embodiments of this invention are as follows:

[0005] The embodiment of the present invention will provide a dust pressing plate monitoring and box-type closed dust removal device for the scraper conveyor transfer area. In the dust pressing plate monitoring and grading module, coal flows through the window of the closed dust suction and purification control box and falls. A dust concentration monitoring plate is set up outside the observation window on the side wall of the box body. The dust concentration monitoring plate converts the pressure signal generated by the impact of dust into an electrical signal through a built-in piezoelectric film sensor. The specific process is that when the piezoelectric material on the dust monitoring plate in the box is impacted by dust, charges will be formed on its surface. After the charges are amplified by a charge amplifier and the measurement circuit and the impedance is transformed, they are converted into an electrical quantity output proportional to the external force received. According to the classification standard, the dust removal requirements are divided into four levels: low-concentration green warning, medium-concentration yellow purification, high-concentration orange dust removal, and ultra-concentration red evacuation. And different dust removal methods are adopted for each response level. By adjusting the fluid pressure in the pipeline, the power of the dust removal system is adjusted. Facing different dust generation situations, through dust monitoring and grading, the dust removal work is carried out according to different response levels. In the closed dust removal module, the water curtain device of the closed dust purification control box in the transfer area wets the coal flow on the conveyor belt with a water curtain at the coal flow inlet window, reducing the probability of dust generated by the falling of the coal flow. Next, the "T"-shaped gas-liquid two-phase hybrid atomizing nozzles on the top and side walls of the box body will carry out dust removal actions on the generated dust, and the dust generated during the transfer process is removed in the form of atomized spraying. At the same time, the water-washing transmission negative-pressure dust suction device will also form a negative-pressure area in the cavity through the linear reciprocating motion of the connecting rod, so as to suck the dust escaping in the closed box. In this way, through the combination of multiple dust removal methods, multi-level, multi-directional, and multi-angle dust removal is achieved.

[0006] In the first aspect, the dust concentration in the closed box body is divided by the dust concentration monitoring pressing plate, and the gas or liquid pipelines connected to the water curtain device at the window, the "T"-shaped gas-liquid two-phase hybrid atomizing nozzle, and the water-washing transmission negative-pressure dust suction device are reasonably arranged and pressure regulating valves are installed to realize the adjustment of different dust removal powers and the hierarchical response to the dust removal requirements in the transfer area.

[0007] Around the first aspect, the dust concentration monitoring pressing plate is installed on the wall of the closed dust suction and purification control box. The monitoring pressing plate is composed of a super-hydrophobic wear-resistant film, a piezoelectric film sensor, a honeycomb aluminum moisture-proof buffer filling, and an explosion-proof embedded long-endurance auxiliary battery. The dust concentration monitoring pressing plate feeds back signals on the dust concentration in the box body.

[0008] Optionally, for the dust concentration monitoring pressing plate, a super-hydrophobic film is used to reduce the adsorption of water mist on the monitoring plate surface, a piezoelectric film sensor is used to convert the pressure signal of dust impact into an electrical signal, and a honeycomb aluminum buffer material is used to maintain the stability of the device.

[0009] Optionally, the pressure signal of the dust impact monitoring pressing plate is converted into an electrical signal for feedback. With the support of monitoring data, the dust response level is specified according to the size of the force-bearing range. Four dust threat levels are defined: low-concentration green warning (0 - 80 μN), medium-concentration yellow purification (80 - 2000 μN), high-concentration orange dust removal (2000 - 8000 μN), and ultra-concentration red evacuation (8000 - 20000 μN), so as to guide the front-line workers in coal mines to adjust the dust removal power of the whole system.

[0010] Regarding the first aspect, for dust concentration grading response dust removal, 3 "T"-shaped gas-liquid two-phase hybrid atomizing nozzles are installed on the metal wall surface at the top of the box; 2 adjustable-angle atomizing nozzles are installed on the wall surface on one side of the box, and the water supply and gas supply pipeline pressures of the nozzles and the water-washing drive negative-pressure dust suction device are adjusted to achieve various dust removal method responses.

[0011] Preferably, for the selected atomizing nozzle connection device, the three nozzle connection points on its top wall surface are in a ring-shaped card slot structure, and the outer wall surface of the nozzle is provided with a snap-type structure to connect with the reserved card slot on the top of the box; the two nozzle connection points on its side wall surface are in an adjustable inclination buffer structure, providing an adjustment angle with an included angle of 60° - 90° with the ground.

[0012] Optionally, for the gas and liquid pipelines of the atomizing nozzle and the water-washing drive negative-pressure dust suction device, an air pressure regulating valve, an air filter, and a switch valve are installed on the main gas pipeline, and a liquid pressure regulating valve, a liquid filter, and a switch valve are installed on the main liquid pipeline. By operating the pressure regulating valve, the control of the air intake and liquid intake of the pipeline is realized.

[0013] Preferably, for the required liquid phase flow and gas phase flow of the atomizing nozzle, the water curtain device, and the water-washing drive negative-pressure dust suction device, the liquid phase flow is supplied by static pressure water. The water flows from the ground through hundreds of meters of pipelines into the underground, and during this process, the static pressure of the water continuously increases, and no additional pressure boosting treatment is required. The compressed air flow in the gas pipeline is provided by the ventilation pipeline in the mine roadway.

[0014] Preferably, in the four response methods, the power of the atomizing nozzle is divided into 1 - 4 levels, keeping the ratio of water pressure and air pressure unchanged. When the power is at level 1, the water pressure is 2 MPa, the air pressure is 3 MPa, and the ratio of water pressure to air pressure is 1:1.5, and the water pressure increases by 1 MPa step by step. The movement power of the negative-pressure dust suction device is divided into 1 - 4 levels. Considering that the negative-pressure dust suction device is driven by static pressure water to impact the six-blade propeller for movement, the movement power is represented by water pressure. When the power is at level 1, the water pressure is 3 MPa, and it increases by 1 MPa step by step.

[0015] In the second aspect, in the coal transportation and transfer area, a water curtain device of a "T"-shaped gas-liquid two-phase hybrid atomizing nozzle, a water-washing drive negative-pressure dust suction device, and a closed dust suction and purification control box is adopted to achieve efficient closed dust removal in the transfer area.

[0016] Regarding the second aspect, for the "T"-shaped gas-liquid two-phase hybrid atomizing nozzle, its pipeline consists of an embedded gas supply pipe and a main liquid inlet pipe. The liquid inlet pipeline is nested on the outer wall surface of the primary mixing chamber. The cylindrical mixer is embedded inside the nozzle device. Behind the mixing chamber is a converging narrow channel. The end of the hammer-shaped flow guide is connected to the round table surface of the nozzle port to form a fixation.

[0017] Preferably, the primary gas-liquid mixing chamber and the hammer-shaped flow guide inside the nozzle mix the gas-liquid two-phase working flow. The gas-liquid two-phase working flow is mixed for the first time in the primary mixing chamber. Then, the mixed flow is shunted in all directions under the guidance of the hammer-shaped flow guide through the narrow channel at the end of the mixing chamber, thereby achieving the second gas-liquid mixing.

[0018] Preferably, for the gas-liquid two-phase hybrid atomizing nozzle, the structure at the water outlet release hole is approximately frustum-shaped, the water spraying holes are in the shape of a gradually expanding horn, and each release hole is evenly distributed on the wall surface of the frustum-shaped front end of the nozzle at a 60° angle, achieving a multi-angle and large-range atomization effect. The diameter of the water outlet holes is 0.5 - 1.0 mm.

[0019] Regarding the second aspect, for the primary gas-liquid mixing chamber of the nozzle, the water inlet holes on the chamber wall are distributed in a fan shape with a sparse front and a dense rear according to the position from the liquid inlet channel. There is a stirring fan inside the chamber, and both ends are supported and stabilized by springs. Due to the buffering effect of the springs, the stirring fan can not only rotate under the impact of the air flow and liquid flow to help mix the gas-liquid two-phase, but also perform a short-distance simple harmonic motion in the front and rear directions, thereby increasing the mixing effect of the gas-liquid two-phase.

[0020] Preferably, for the liquid inlet holes and the stirring fan of the primary gas-liquid mixing chamber of the nozzle, the liquid inlet holes are distributed around the wall surface, and the number of each layer increases from 6, 10, 12, 14; a stirring fan supported by a spring structure is designed inside the mixing chamber, and the spring supports are located at the central axis and the upper and lower ends of the stirring fan respectively. The spring constant k of this spring is 800 - 1000 N / m.

[0021] Regarding the second aspect, for the water-washing transmission negative-pressure dust suction device, the upper part of its air inlet channel is funnel-shaped and connected to a closed dust purification control box. Dust falls into the dust collection tank through the holes below the piston movement channel. A porous water-washing device is designed above the air inlet channel, and the water flow covers the movement cavity to clean the residual dust in the cavity.

[0022] Preferably, for the water-washing transmission negative-pressure dust suction device, the upper end of its air inlet channel is funnel-shaped, and as the narrow channel contracts, it can endow the device with a greater negative pressure to increase the dust inhalation volume; the dust collection tank has a multi-stage funnel-shaped internal structure, wider at the top and narrower at the bottom, with a gyro-shaped dust-proof net distributed.

[0023] Regarding the second aspect, for the power source of the water-washing transmission negative-pressure dust collection device, its reciprocating motion is realized by a six-blade propeller at one end of the transmission shaft driven by water flow. The static-pressure water impacts the blades to rotate, and the blades drive the transmission connecting rod to act to realize the reciprocating motion of the piston, generating a negative-pressure area for dust collection.

[0024] Preferably, the belt conveyor is located hundreds of meters underground in the mine. The static-pressure water transported from the ground to the underground has great potential energy. The static-pressure water is used to impact the blade movement, and the rotation speed of the blade is controlled by setting a pressure control valve on the pipeline.

[0025] Regarding the second aspect, the enclosed dust collection and purification control box is composed of a box body, a water curtain device and a multi-angle adjustable telescopic bracket. The main body is made of aluminum alloy, which is light and has good corrosion resistance. The wall surface of the box body is distributed with coal flow inlet and outlet windows, dust collection device connection points, nozzle connection points and observation windows. There are three nozzle connection points, working liquid phase flow and gas phase flow pipelines on the top of the box body. The multi-angle bracket maintains the stability of the enclosed dust collection and purification control box, and the end of the bracket is in a disc shape.

[0026] Preferably, a water curtain is arranged along the upper edge of the outer wall of the window where the conveyor extends into the box body. The water outlet of the water curtain is linear and is supplied with water by four branch water pipes. Anti-wear and dust-proof curtains are installed on the inner wall surface of the coal flow inlet and outlet windows in a multi-layer staggered distribution. The dust-proof curtains are made of rubber, embedded with steel wire meshes and coated with silicone resin on the outside.

[0027] Optionally, the box body is connected by a buckle structure reserved for the atomizing nozzle, so that only a small part of the front end of the nozzle is exposed inside the box body, reducing the exposure range of the atomizing nozzle, effectively preventing the collision of coal blocks during the falling process of the coal flow, and avoiding damage to the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To better explain the specific technical solutions in the embodiments of the present invention, the drawings involved in the embodiments are described.

[0029] Figure 1 It is a composition diagram of dust pressing plate monitoring and box-type closed dust removal in the scraper conveyor transfer area of the mine in the embodiment of the present invention;

[0030] Figure 2 It is a diagram of the "T"-shaped gas-liquid two-phase hybrid atomizing nozzle in the embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the water-washing transmission negative-pressure dust collection device in the embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the enclosed dust collection and purification control box in the embodiment of the present invention;

[0033] Figure 5Schematic diagram of atomization infiltration type and negative pressure collection type dust removal according to the embodiments of the present invention;

[0034] Figure 6 Schematic diagram of dust concentration pressing plate monitoring and grading response according to the embodiments of the present invention;

[0035] Figure 7 Schematic diagram of multi-angle adjustable telescopic bracket according to the embodiments of the present invention;

[0036] Figure 8 Schematic diagram of the position information and pipeline distribution of the transfer area according to the embodiments of the present invention.

[0037] Elaboration of specific design details and working principle

[0038] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Among them:

[0039] Ф1: 100 - 110 mm; Ф2: 75 - 80 mm; Ф3: 85 - 90 mm; Ф4: 150 - 160 mm; L1: 200 - 230 mm; d1: 65 - 70 mm; h1: 30 - 40 mm; r1: 100 - 110 mm; r2: 60 - 80 mm.

[0040] Refer to Figure 1 As shown, it is a composition diagram of dust pressing plate monitoring and box-type closed dust removal in the transfer area of the mine scraper conveyor. The dust pressing plate monitoring unit consists of a dust concentration monitoring plate and a response grading division, and different dust removal response actions are made on this basis. The closed dust removal unit is realized by a "T"-shaped gas-liquid two-phase mixing atomizing nozzle, a water curtain device and a water-washing drive negative pressure dust suction device, and it can be divided into atomization infiltration type dust removal and negative pressure collection type dust removal.

[0041] During the process of dust monitoring and grading response, the coal flow is sent into the closed dust suction and purification control box. Dust is generated when the coal blocks fall. The dust particles in the dispersed state will hit the highly sensitive dust monitoring plate on the box wall. Among them, the piezoelectric element is stressed, and the pressure signal is converted into an electrical signal and fed back to the control end. The specific process is that when the piezoelectric material on the dust monitoring plate in the box is hit by dust, charges will be formed on its surface. After the charges are amplified by the charge amplifier and the measurement circuit and the impedance is transformed, they are converted into an electric quantity output proportional to the external force received. According to different force ranges, grading responses are made, and the dust removal response levels are divided into low-concentration green warning (0 - 80 μN), medium-concentration yellow purification (80 - 2000 μN), high-concentration orange dust removal (2000 - 8000 μN), and ultra-concentration red evacuation (8000 - 20000 μN).

[0042] During the low-concentration green warning, only the nozzles in Group A are turned on and output at Level 1 power (water pressure 2MPa, air pressure 3MPa), and the negative pressure dust collection device uses Level 1 power; during the medium-concentration yellow purification, only the nozzles in Group A are turned on and output at Level 2 power, and the dust collection device uses Level 2 power; during the high-concentration orange dust removal, the nozzles in Group A and Group B are all turned on, and the nozzles and dust collection device output at Level 3 power; during the ultra-concentration red evacuation, the nozzles in Group A and Group B are all turned on and output at Level 4 power, and the dust collection device uses Level 4 power. At the same time, a warning is issued, requiring emergency evacuation of personnel on the work surface.

[0043] Among the four response modes, the power of the atomizing nozzle is divided into 1 to 4 levels, keeping the ratio of water pressure and air pressure unchanged. At level 1, the water pressure is 2MPa, the air pressure is 3MPa, the water-air pressure ratio is 1:1.5, and the water pressure increases by 1MPa step by step. The motion power of the negative pressure vacuum device is divided into 1 to 4 levels. Considering that the negative pressure vacuum device is moved by the static pressure water impacting the six-blade propeller, the water pressure is used to represent the motion power. At level 1, the water pressure is 3MPa, and it increases by 1MPa step by step.

[0044] Depend on Figure 1 It can be seen that in the dust removal system, the water curtain device of the closed dust purification control box in the transfer area wets the coal flow on the conveyor belt with a water curtain at the window where the coal flow enters, reducing the probability of dust generated by the falling coal flow. Next, the "T"-shaped gas-liquid two-phase mixed atomizing nozzles on the top and side walls of the box will carry out dust removal on the generated dust, and remove the dust generated during the transfer process in the form of atomizing spray. At the same time, the water-washing transmission negative pressure dust suction device will also form a negative pressure area in the cavity through the linear reciprocating motion of the connecting rod, thereby absorbing the dust scattered in the closed box. Among them, the three atomizing nozzles on the top of the control box are divided into group A nozzles, and the two atomizing nozzles on the wall of the box are divided into group B. The water-washing transmission negative pressure dust suction device removes the dust that has not been removed, including a trumpet-shaped air inlet design, a porous water washing device, a propeller power source and an anti-dust collection box design. Pressure regulating valves are installed in the gas and liquid pipelines of the atomizing nozzle, and the negative pressure dust suction device is driven by water flow. In this way, multi-level, multi-directional and multi-angle dust removal can be achieved through the combination of various dust removal methods.

[0045] according to Figure 2 As shown, the "T"-shaped gas-liquid two-phase mixing atomizing nozzle has a pipeline composed of an embedded air supply pipe and a mainstream liquid inlet pipe. The liquid inlet pipeline is nested on the side of the primary mixing chamber, and the cylindrical mixing chamber is embedded in the nozzle device. The narrow channel of the mixed flow contraction is connected to the mixing chamber, the outer side of the narrow channel is closed with the wall surface, the end of the hammer-shaped flow guider is connected to the round table surface of the collision port to form a fixed connection, and the outer wall of the nozzle is a snap-on structure connected to the slot reserved on the top of the box.

[0046] Among them, the air supply pipe and the main liquid inlet pipe transport fluid media to the primary mixing chamber. Affected by the internal structure of the nozzle, the gas-phase working flow and the liquid-phase working flow are mixed for the first time when entering the cylindrical mixing chamber. Then, the mixed flow is shunted around under the guidance of the hammer-shaped flow deflector through the narrow passage at the end of the mixing chamber, so as to achieve the second gas-liquid mixing. The mixed flow is released from the spray holes on the side wall of the frustum-shaped port. Six gradually expanding trumpet-shaped water spray holes are evenly distributed on the side wall of the frustum. Each release hole is evenly distributed on the wall of the frustum-shaped front end of the nozzle at an angle of 60°, and the diameter of the release hole is 0.5-1.0 mm. At the same time, according to Bernoulli's principle, the pressure of the gas-liquid mixed flow decreases after passing through the narrow passage, but the mixed flow will obtain a greater flow velocity, so that the gas-liquid mixed flow shows a better atomization effect when reaching the outside through the release hole.

[0047] The distribution of the liquid inlet holes on the outer wall surface of the primary gas-liquid mixing chamber is in a fan-shaped distribution with a sparse front and a dense back according to the distance from the hole around the wall to the liquid-phase working flow inlet. The liquid inlet holes are distributed around the wall surface, and the number of each layer increases from 6, 10, 12, and 14 from less to more. A stirring fan supported by a spring structure is designed inside the mixing chamber. The spring supports are located at the central axis and the upper and lower ends of the stirring fan respectively, and the spring stiffness coefficient k is 800-1000 N / m. Due to the buffering effect of the spring, the stirring fan can not only rotate under the impact of the air flow and the liquid flow to help mix the gas-liquid two phases, but also perform a short-distance simple harmonic motion in the front and back directions, so as to increase the mixing effect of the gas-liquid two phases.

[0048] A buckle structure is arranged around the outer wall of the nozzle. The nozzle can be combined with the annular card slot connection point reserved on the box body, reducing the part of the atomizing nozzle exposed inside the box body and ensuring the structural stability of the nozzle. On the other hand, the above-mentioned buckle connection method of the nozzle will also play a certain buffering role, avoiding damage to the nozzle caused by large coal blocks during the falling process of the coal flow. In addition, it increases the convenience of nozzle replacement and improves the dust removal efficiency.

[0049] Refer to Figure 3As shown, the water-washing transmission negative pressure dust suction device is composed of a trumpet-shaped air intake channel, a porous water-washing device, a dust collection device and a reciprocating motion device. The front end of the air intake cylinder is a trumpet-shaped air intake port. As the narrow channel shrinks, the device can be given a greater negative pressure to increase the dust intake amount. During the linear reciprocating motion of the piston in the air intake cylinder, the return motion reduces the pressure in the air intake channel, and the dust in the metal box will be pressed into the motion cavity formed by the piston movement. Part of the dust falls directly into the dust collection tank under the action of gravity, and the remaining dust will be washed by the porous water-washing device above the air intake cylinder to wash the residual dust in the motion cavity, preventing the dust from being discharged from the air intake cylinder during the piston movement, thereby improving the dust removal efficiency of the transfer area. The connecting rod of the transmission device is connected to the piston by a joint bearing, and a buffer bearing is installed in the cylinder wall to meet the movement of the connecting rod in a small range and keep a safe distance from the cylinder wall; one end of the short connecting rod is connected to the long connecting rod, and the other end is fixed at the center of the large disc, and the disc is driven to rotate by the transmission rod.

[0050] The internal structure of the dust collection box is in the shape of a multi-stage funnel, and a gyro-type dust screen is set at the same time. The size of the first layer of dust screen is 80-100 mesh, and the size of the second and third layers of dust screen is 100-150 mesh. The multi-stage funnel-shaped internal structure and the gyro-type dust screen can effectively prevent dust from escaping outward after falling in; the bottom of the collection box is designed with a replaceable dust cleaning plate connected by a buckle to facilitate timely removal of collected dust.

[0051] The power source of the dust collection device is a propeller, which adopts a six-blade large side inclined blade design. The blades are bent inward with a certain arc. Under the impact of static pressure water from the ground, the blades drive the transmission connecting rod to realize the reciprocating motion of the piston, generating a negative pressure area for dust collection. The blades are baked blue and coated with epoxy zinc-rich primer to prevent rust caused by long-term exposure to humid air, which affects the rotation effect of the blades. The chord length L1 of a single blade is 200-230mm, the thickness d1 is 65-70mm, and the camber h1 is 30-40mm, so that the six-blade propeller can achieve more efficient rotation under the impact of water flow and reduce the waste of water resources. A radial buffer bearing is set on the transmission rod of the device, in which 6 springs are radially distributed from the middle of the bearing to the outside. The spring material is silicon manganese spring steel, and the spring stiffness coefficient k is 1800-2000N / m. In addition, the embedded fixed base ensures the stability of the device operation.

[0052] Reference Figure 4As shown, the closed dust suction and purification control box is composed of a water curtain device, a multi-stage anti-wear dust curtain, a multi-angle adjustable telescopic bracket and a box body. The box body is a rectangular parallelepiped with a box body height of 1500-2000mm. The main body is made of aluminum alloy, which is light and has good corrosion resistance. Connection points are reserved on the top, bottom and several surfaces around the box body, and are reasonably distributed on each wall. The wall surface is distributed with coal flow in and out windows, dust suction device connection points, nozzle connection points and observation windows. There are three nozzle connection points, working liquid phase flow and gas phase flow pipelines on the top of the box body. The connection point can be connected with a "T"-shaped gas-liquid two-phase mixed atomizing nozzle, a water-washing transmission negative pressure dust suction device, etc., to improve space utilization and avoid crowded distribution of various devices affecting dust removal.

[0053] A multi-layer staggered anti-wear dust curtain is set at the inlet and outlet of the coal flow. The dust curtain is made of rubber, with a steel wire mesh embedded inside and a silicone resin coating attached outside. The dust curtain uses three layers of long tongue-shaped curtain pieces staggered and stacked. The single-layer dust curtain is a long tongue-shaped curtain piece continuously arranged as a whole. The thickness of each curtain piece is 5-8mm, and the offset distance between the curtain pieces of adjacent layers is 30-50mm. The lower curtain piece covers the gap position of the upper curtain piece. The whole device is composed of three layers of dust curtains staggered and stacked. A water curtain is set on the upper edge of the window extending into the box body of the conveyor. The water curtain outlet is linear and water is supplied by four branch water pipes. The water curtain device includes highly absorbent resin, linear and rotary capillary pipes.

[0054] The conveyor belt in the transfer area passes through the window of the control box and is surrounded by the box. During the process of coal flow falling and completing transfer, most of the dust generated is retained in the dustproof box. The window part is equipped with a multi-measure staggered dust curtain to effectively reduce the wear caused by the coal flow and prevent the generated coal dust from escaping. When the high-position coal flow conveyor belt passes through the window on the wall of the box, the water curtain device on the upper edge of the window is opened to soak the coal flow. In order to ensure the continuous and stable output of the water curtain, a layer of highly absorbent resin is arranged inside the water curtain device, and rotating deceleration capillary liquid tubes are distributed near the water injection pipe to achieve uniform water flow inside the water curtain. Four brackets are distributed on the base of the box, and the brackets are in contact with the ground. The total surface area of ​​the chassis of the four brackets is not less than 1 / 4 of the bottom area of ​​the box, so as to ensure the stability of the dust collection and purification control box in the transfer area of ​​the belt conveyor.

[0055] Reference Figure 5It can be seen that the dust removal methods in the reprint area can be divided into two types, namely negative pressure collection dust removal and atomization infiltration dust removal. During the process of negative pressure collection dust removal, when the piston in the intake cylinder moves linearly, the return stroke action reduces the pressure in the intake passage, and the dust located in the closed dust collection and purification control box will be pressed into the moving cavity formed by the piston movement. Some of the dust directly falls into the dust collection tank under the action of gravity, and the remaining dust is washed by the porous water washing device above the intake cylinder to prevent the dust from being discharged from the intake cylinder. The internal structure of the dust collection tank is multi-level funnel-shaped, with a distributed gyro-shaped dust-proof net, and a dust cleaning tray connected by a buckle at the bottom.

[0056] Referring to Figure 5 As shown, in terms of atomization infiltration dust removal, 3 atomizing nozzles are installed on the metal wall surface at the top of the closed dust collection and purification control box, designated as group A, and they are distributed at intervals of 200 mm on the central axis of the wall surface; 2 atomizing nozzles are installed on the box wall, designated as group B. The buckle structure set on the outer wall of the nozzle is connected to the annular card slot reserved on the top wall of the box, which can ensure the stable operation of the atomizing nozzle while reducing the probability of damage when it is hit by coal blocks. An adjustable inclination buffer structure is installed at the reserved connection point of the nozzle on the side wall of the box, which can change the spraying angle of the nozzle on the side wall within the range of 60° - 90° with the ground. This layout makes the atomization range partially overlap, enhancing the local dust removal effect.

[0057] Referring to Figure 6 As shown, it is a dust concentration pressing plate monitoring and grading response system. Among them, the hydrophobic and wear-resistant dust monitoring pressing plate is arranged on the wall of the closed dust collection and purification control box. The monitoring plate is composed of a super-hydrophobic and wear-resistant film, a piezoelectric film sensor, a honeycomb aluminum moisture-proof buffer filling, and an embedded explosion-proof long-endurance auxiliary battery.

[0058] It can be seen from Figure 6 that when dust particles impact the monitoring plate, the piezoelectric film sensor generates an electrical signal according to the force. The control end receives the feedback electrical signal to determine the dust concentration inside the box, and conducts grading responses according to different force ranges. The dust removal response levels are divided into four types: low-concentration green warning (0 - 80 μN), medium-concentration yellow purification (80 - 2000 μN), high-concentration orange dust removal (2000 - 8000 μN), and ultra-concentration red evacuation (8000 - 20000 μN), so as to guide the staff to adjust the dust removal power of the entire system.

[0059] The dust removal device will perform dust removal actions according to different response levels. All dust removal equipment stops operating for 5 s every 5 min, and after 5 s, the dust concentration monitoring plate starts monitoring again, and then the dust removal equipment continues to operate. The reprint area is dust-removed in this cyclic manner.

[0060] Referring to Figure 7It can be seen that the multi-angle adjustable telescopic support of the box body has a slip ring lifting and telescopic design, a multi-directional joint bearing movement design, and a chassis tilting design. The slip ring moves along the striped channel to change the height of the support; the upper end of the multi-directional adjustment bearing is a spherical joint bearing, and there is a hydrophobic and rust-resistant sliding shaft below. The upper and lower parts are connected by a threaded method. In addition, the support chassis uses copper alloy as a flame-retardant and wear-resistant material, and its middle part provides a movement channel for the sliding shaft. The multi-directional adjustment bearing can slide along the channel. The lower part of the chassis uses polymer wear-resistant and anti-slip nails, and the anti-slip nails are distributed in a radially gradient manner. The diameter of the anti-slip nails decreases from the inside to the outside, and the number of anti-slip nails distributed from the inside to the outside is 1, 6, 12, 20. The diameter range of the anti-slip nails under the chassis is 12-30 mm.

[0061] The circular distribution of the anti-slip nails ensures more sufficient and uniform friction between the disc and the ground, enhancing the stability of the chassis. Its outer layer is a polymer material layer attached to the outer layer of the anti-slip nail body. In addition, the upper part of the anti-slip nail is a bolt stripe, and the anti-slip nail can be freely disassembled and installed from the chassis. The above design realizes the multi-angle adjustment and telescopic function of the support, and has stronger adaptability to the mine ground environment.

[0062] Refer to Figure 8 As shown in the figure, the right figure shows the position distribution of the transfer area underground. The coal flow is transferred from the conveyor at the shearer to the transfer area, and then the transportation direction in the roadway is changed. During the transfer process, a large amount of dust will be generated in the coal flow, which is harmful to the health of the operators. The liquid-phase working flow supply pipeline in the transfer area is directly supplied by the static pressure water from the ground. The main pipeline is laid along the edge of the roadway, and multiple pressure control valves are installed on the pipeline. Considering that the quality of the static pressure water is relatively hard and there are a large number of calcium ions and magnesium ions distributed in the water body, it is easy to block the nozzle outlet without filtration treatment. Therefore, a liquid filtration device is installed on the liquid-phase flow pipeline. The gas-phase working flow is supplied by the underground ventilation pipeline. The air flow is transported to the transfer area through the ventilation pipeline, and a pressure control valve is installed on the gas-phase supply pipeline to control the air supply flow. In addition, due to the poor air circulation in the roadway and the distribution of free dust and particles, an air filtration device is installed on the gas-phase working flow pipeline to prevent large-particle dust from blocking the nozzle from the intake channel.

[0063] Figure 8 The left figure shows the pipeline distribution on the top of the closed dust collection and purification control box in the transfer area. Among them, the compressed air pipeline and the high-pressure liquid pipeline supply water and gas to the 3 atomizing nozzles on the top of the box body, the 2 atomizing nozzles on the side wall surface, and the water curtain device. The pipeline distribution on the top of the box body, the gas pipeline and the liquid pipeline of the atomizing nozzle are attached to the outer wall surface of the box body, and a branch pipeline is set to connect with the nozzle body. The main pipeline of the water curtain device is divided into four thin pipelines. The gas-phase and liquid-phase pipelines are made of polybutene materials, and the pipelines are arranged in a staggered manner up and down. The nozzles and the water curtain branch pipelines use rubber hoses. The high-speed liquid flow in the liquid pipeline is supplied by the ground static pressure water, and the compressed air flow in the gas pipeline is supplied by the mine ventilation pipeline.

Claims

1. A box-type enclosed dust removal device for use in the scraper transport transfer area of ​​a mine, characterized in that: include: Dust concentration monitoring and grading module and multi-element dust removal module in the transfer area; The dust concentration monitoring and grading module in the transfer area includes a dust concentration monitoring pressure plate composed of a super-hydrophobic and wear-resistant film, a piezoelectric film sensor, a honeycomb aluminum moisture-proof buffer filling, and an explosion-proof embedded long-life auxiliary battery. The dust concentration monitoring pressure plate is placed on the wall of the closed dust collection and purification control box. The dust concentration monitoring pressure plate provides signal feedback on the dust concentration in the closed dust collection and purification control box, and divides the dust removal response level according to the range of impact force on the dust concentration monitoring pressure plate, and guides the staff to adjust the dust removal power and dust removal method of the box-type closed dust removal device; The water-washing transmission negative pressure dust suction device in the multi-element dust removal module is composed of a trumpet-shaped air intake channel, a porous water-washing device, a dust collection device and a reciprocating motion device. The upper part of the air intake channel is connected to the closed dust suction and purification control box in a funnel shape. The water-washing transmission negative pressure dust suction device also includes an air intake cylinder. During the linear motion of the piston in the air intake cylinder, the dust in the closed dust suction and purification control box will be pressed into the motion cavity formed by the piston movement. The closed dust collection and purification control box is composed of a "T"-shaped gas-liquid two-phase mixed atomizing nozzle, a continuous water curtain device and a multi-angle adjustable telescopic bracket; The coal flows into and falls through the window of the closed dust suction and purification control box. The continuous water curtain device soaks the coal flow on the conveyor belt with water curtain at the coal flow entrance window to reduce the probability of dust generated by the falling coal flow. The "T"-shaped gas-liquid two-phase mixed atomizing nozzles on the top and side walls of the closed dust suction and purification control box will carry out dust removal on the generated dust, and remove the dust generated during the transfer process in the form of atomized spray. The water-washing transmission negative pressure dust suction device absorbs the dust scattered in the closed box. Part of the dust falls directly into the dust collection device under the action of gravity, and the remaining dust is washed by the porous water washing device above the air intake cylinder to prevent the dust from being discharged from the air intake cylinder.

2. According to the box-type closed dust removal device described in claim 1, the "T"-shaped gas-liquid two-phase mixing atomizing nozzle is composed of a liquid inlet pipe, a primary gas-liquid mixing chamber, a snap-on outer wall, and a hammer-shaped drain; the liquid inlet pipe is divided into an embedded air supply pipe and a mainstream liquid inlet pipe, the liquid inlet pipe pipeline is nested in the outer wall of the primary gas-liquid mixing chamber, and the cylindrical primary gas-liquid mixing chamber is embedded in the "T"-shaped gas-liquid two-phase mixing atomizing nozzle; the release hole of the "T"-shaped gas-liquid two-phase mixing atomizing nozzle is in a gradually expanding trumpet shape, which is wide in front and narrow in the back, and each release hole is evenly distributed at an angle of 60° on the wall of the truncated cone-shaped front end of the "T"-shaped gas-liquid two-phase mixing atomizing nozzle, and the diameter of the release hole is 0.5~1.0mm.

3. According to the box-type closed dust removal device described in claim 2, the liquid inlet holes are distributed around the outer wall of the primary gas-liquid mixing chamber, and are distributed in a fan-shaped manner with sparseness in the front and denseness in the back according to the distance from the surrounding wall of the liquid inlet holes to the liquid phase working flow inlet, and the aperture of each layer gradually changes from large to small; a stirring fan supported by a spring structure is designed inside the mixing chamber, and the spring supports are respectively located at the central axis and the upper and lower ends of the stirring fan.

4. According to the box-type closed dust removal device described in claim 1, the internal structure of the dust collection device is a multi-stage funnel shape, with gyro-type dust-proof nets distributed, the size of the first layer of dust-proof nets is 80-100 meshes, the mesh size of the second and third layers of dust-proof nets is higher than the first layer, and there is a dust cleaning plate connected by a snap at the bottom of the dust collection device.

5. According to claim 1, the box-type closed dust removal device, its power source is a six-blade propeller driven by static pressure water, the blades adopt a large side inclined blade design, the blades are bent inward with a specific curvature, the blueing process is adopted, and the epoxy zinc-rich primer is coated on the outside. The blade chord length L1 is 200-230mm, the thickness d1 is 65-70mm, and the camber h1 is 30-40mm; a radial buffer bearing is arranged on the transmission rod of the power source, wherein 6 springs are radially distributed from the middle of the bearing to the outside, and the spring material is silicon manganese spring steel, and the power source is supported by an embedded fixed base.

6. According to the box-type closed dust removal device described in claim 1, the box body of the closed dust suction and purification control box is a rectangular parallelepiped with a height of 1500 to 2000 mm; a multi-level staggered anti-wear dust curtain is arranged at the inlet and outlet of the coal flow, the dust curtain is made of rubber material, with a steel mesh embedded in it and a silicone resin coating attached to the outside, and three layers of long tongue-shaped curtain pieces are staggered and stacked, and the offset distance between each layer of curtain pieces is 30 to 50 mm; the continuous water curtain device includes highly absorbent resin, linear and rotary capillary tubes.

7. According to the box-type closed dust removal device according to claim 1, the three nozzle connection points on the top wall of the closed dust suction and purification control box are annular groove structures, and the two nozzle connection points on the side wall are adjustable tilt buffer structures, providing an adjustment angle of 60° to 90° with the ground; the multi-angle adjustable telescopic bracket includes a slip ring lifting and telescopic design, a chassis tilting design and a multi-directional joint bearing movement design, and the end of the multi-angle adjustable telescopic bracket is disc-shaped, and polymer wear-resistant anti-slip spikes are distributed on the bottom, and the anti-slip spikes are arranged in a radial gradient.

8. According to the box-type closed dust removal device according to claim 7, the lifting and telescopic design is composed of a sliding ring and a threaded support rod, the upper end of the multi-directional joint bearing is a tapered spherical joint bearing, and the lower part is a hydrophobic and rust-resistant sliding shaft, and the upper and lower parts are connected by threads; the chassis adopts copper alloy as flame-retardant and wear-resistant material, and the middle part provides a movement channel for the sliding shaft; polymer wear-resistant anti-slip spikes are used under the chassis, and the number distributed from the inside to the outside under the chassis is 1, 6, 12, and 20, and the diameter range of the anti-slip spikes is 12 to 30 mm.

9. According to the box-type closed dust removal device described in claim 1, the gas pipeline and liquid pipeline of the "T"-shaped gas-liquid two-phase mixing atomizing nozzle are close to the outer wall of the box, and a branch pipeline is provided to be connected to the main body of the "T"-shaped gas-liquid two-phase mixing atomizing nozzle, and the main pipeline of the continuous water curtain device is divided into four thin pipelines; the gas pipeline and the liquid pipeline are arranged in an upper and lower staggered manner, the high-speed liquid flow in the liquid pipeline is supplied by static pressure water from the ground, and the compressed air flow in the gas pipeline is supplied by the mine ventilation pipeline.

10. According to the box-type closed dust removal device of claim 1, the box-type closed dust removal device stops working for 5 seconds after the dust concentration monitoring pressure plate acts for 5 minutes, and then the dust concentration monitoring pressure plate starts to operate again, and the residual dust concentration in the box is fed back according to the change of the electrical signal of the dust impacting the dust concentration monitoring pressure plate, and the dust is graded based on the dust impact force, and the data control end divides the dust removal response level; the dust removal response level is divided into green warning for low concentration, yellow purification for medium concentration, orange dust removal for high concentration, and red evacuation for excessive concentration, and this is used as a basis to guide the staff to adjust the dust removal power and dust removal method of the box-type closed dust removal device.

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