Large-stage coal slipping hole and coal conveying method for comprehensive mechanized mining working face of vertical groove coal

Abstract

The invention relates to the technical field of coal mine engineering, in particular to a large-stage coal slipping hole and coal conveying method for a comprehensive mechanized mining working face of vertical channel coal. The device comprises coal slipping holes which are arranged in a coal seam of a vertical groove coal working face, at least two coal slipping holes which are directly communicated with a coal seam mining horizontal lower boundary are arranged along the inclination direction of the coal seam, and coal slipping pipes are arranged in the coal slipping holes; an anti-blocking device is arranged at the upper end opening of the coal slipping hole, and a buffer device is arranged at the lower end opening of the coal slipping hole. Raw coal mined from a working face is conveyed through the coal slipping hole, sequentially screened by the flow dividing shovel, buffered by the elastic buffer and subjected to energy dissipation by the energy dissipation plate and then falls into the coal bunker; raw coal is conveyed through the large-stage coal slipping hole, a traditional belt conveyor and an original self-slipping device are replaced, and the raw coal conveying problem of the vertical groove coal down-dip mining working face is solved.

Description

Technical Field

[0001] This invention relates to the field of coal mine engineering technology, and is a large-stage coal chute and coal conveying method for vertical coal seam mechanized mining faces. Background Technology

[0002] A coal chute is a vertical coal chute used in mining for vertically conveying coal. By utilizing the height difference of the coal chute, coal from the upper horizontal section is directly conveyed to the lower transport system, effectively improving transport efficiency. The design of safety facilities in underground mines clearly requires that the diameter of the coal chute be combined with production capacity, and that the coal chute balance transport efficiency and safety, reflecting technical feasibility and economic rationality.

[0003] Patent document CN120922515A discloses a coal chute with multi-stage buffering function, including a feed inlet and a connecting pipe at the bottom of the feed inlet. The feed inlet connects the connecting pipe to the discharge port of the raw coal crusher, allowing the crushed raw coal to enter the inner cavity of the connecting pipe. A dust removal and buffering mechanism is used to remove dust from the crushed raw coal. This mechanism buffers the raw coal fragments discharged from the connecting pipe and absorbs and collects dust and particulate matter from the raw coal, achieving dust and particulate matter removal as the raw coal accumulates. An anti-clogging mechanism is used to prevent the raw coal from clogging the dust removal and buffering mechanism, and a wrapping box is installed on the outer surface of the anti-clogging mechanism, achieving a multi-stage buffering effect for the raw coal during transportation.

[0004] Patent document CN222848246U discloses a coal chute lock-opening unloading device, relating to the field of coal mining technology. Its main purpose is to simplify the structure of coal conveying equipment and reduce safety hazards. The main technical solution of this utility model is: a coal chute lock-opening unloading device, which includes: an inclined guide pipe and a buffer mechanism; the upper port of the inclined guide pipe is connected to the coal chute; the buffer mechanism includes a wind-blocking component and a counterweight component, the upper end of which is fixedly connected to the upper side of the lower port of the inclined guide pipe, and the wind-blocking component is fixedly attached to the counterweight component to cover the lower port of the inclined guide pipe.

[0005] Patent document CN215595647U discloses a self-sealing coal chute device, including a collection hopper, an ore layer on the outer side of the top of the collection hopper, a coal chute pipe fixedly connected to the bottom of the collection hopper, a self-sealing plate mechanism on one side of the bottom of the coal chute, the self-sealing plate mechanism including a plug shell, a shell groove opened inside one side of the plug shell, a self-sealing colloid embedded inside the shell groove, a shell protrusion fixedly connected to the plug shell at the bottom of the shell groove, a connecting rod mechanism at the top of one side of the self-sealing plate mechanism, the connecting rod mechanism including a first connecting rod, a second connecting rod fixedly connected to one side of the top of the first connecting rod, and a counterweight mechanism on one side of the connecting rod mechanism. By using the self-sealing plate mechanism, the connecting rod mechanism and the counterweight mechanism, the coal chute can be sealed immediately after coal feeding, and the present invention has the characteristics of wear resistance, long service life and easy maintenance.

[0006] The limitations and shortcomings of existing technologies include: limited height and applicability; conventional coal chutes are generally between 10m and 60m high, with diameters of 2-4m. They primarily serve near-horizontal or gently dipping multi-seam coal seams and are mostly located within rock strata. Support methods are limited, employing anchor mesh spraying or concrete pouring, with wear-resistant steel plates as a secondary support. However, for coal seams with ultra-high (>100m) chutes in vertical coal seam mining, which must withstand long-term coal flow impact, their durability and stability require reassessment. A comprehensive system solution integrating coal conveying, buffering, dust removal, safety monitoring, and video surveillance needs to be developed to address the specific characteristics of vertical coal seam mining (such as high coal flow impact and challenges in dust and gas control).

[0007] Therefore, existing technologies are insufficient to meet the demands of large-scale, high-intensity coal transportation in mechanized vertical coal mining. Summary of the Invention

[0008] This invention provides a large-stage coal chute and coal conveying method for vertical coal mechanized mining faces, overcoming the shortcomings of the prior art and solving the problem of large-stage, high-intensity coal conveying requirements in vertical coal mechanized mining.

[0009] One of the technical solutions of the present invention is achieved through the following measures: a large-stage coal chute for a vertical coal seam fully mechanized mining face, comprising coal chutes arranged in the coal seam of the vertical coal seam, at least two coal chutes arranged along the dipping direction of the coal seam that directly reach the lower boundary of the coal seam mining level, a coal chute pipe installed in the coal chute, an anti-blocking device installed at the upper end of the coal chute, and a buffer device at the lower end of the coal chute.

[0010] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned anti-clogging device includes a feeding hopper and a grid. The feeding hopper is installed at the upper end of the coal chute, and the grid is installed at the upper end of the feeding hopper; or / and, a gas and dust monitoring device and a carbon monoxide detector are respectively installed on the upper inner side of the coal chute; or / and, a conveying device and an iron removal device are provided above the corresponding coal chute.

[0011] The above-mentioned feeding hopper is a double-layer hopper. A dust outlet connected to the inner cavity is provided on the upper outer side of the feeding hopper, and a dust collector is installed at the dust outlet of the feeding hopper.

[0012] The aforementioned buffer device includes a bent pipe, a diversion shovel, an elastic buffer, and an energy dissipation plate. The bent pipe and the diversion shovel are installed sequentially from top to bottom at the lower end of the coal chute. The angle between the lower end of the bent pipe and the horizontal plane is 30° to 35°. Screen holes are distributed at the bottom of the diversion shovel, and at least three guide ribs are arranged axially on the upper surface of the bottom of the diversion shovel.

[0013] Below the aforementioned coal chute is a coal bunker, and on top of the coal bunker is a cover plate. On the left side of the cover plate is a feed inlet, through which the lower end of the coal chute extends into the coal bunker. A steel beam is installed at the bottom of the cover plate, and the lower part of the coal chute is fixed to the steel beam. A support beam is installed on the upper part of the coal bunker, and a diversion shovel is installed on the support beam. Two rows of elastic buffers are suspended along the left and right directions at the bottom middle of the cover plate, with adjacent elastic buffers staggered. On the right inner wall of the coal bunker, an energy dissipation plate with a lower left side and a higher right side is installed. The elastic buffers and energy dissipation plate correspond to the discharge end of the diversion shovel.

[0014] The above-mentioned gas and dust monitoring devices and lidar coal level detectors are respectively installed between the coal bunker wall and the bend; or / and, at least two sets of air cannons are symmetrically installed on the lower outer side of the coal bunker, and air guns are installed on the air cannons, with the air guns located inside the coal bunker; or / and, a discharge port is provided at the bottom of the coal bunker, and a coal feeder is installed at the discharge port of the coal bunker.

[0015] The aforementioned coal chute is made of wear-resistant steel; or / and, the coal chute consists of several sections of sleeves connected end to end and capable of quick assembly and disassembly, the length of each sleeve section is matched with the coal mining height of one cycle of the coal mining machine, and two movable retaining rings are symmetrically arranged on the outer side of the end of each sleeve section.

[0016] The second technical solution of the present invention is achieved through the following measures: a coal conveying method for a large-stage coal chute in a vertical coal seam fully mechanized mining face, comprising the following steps: The first step is to arrange at least two coal chutes that run straight to the lower boundary of the coal seam mining level in the coal seam of the vertical coal face along the diagonal direction of the coal seam. Coal chute pipes are installed in the coal chutes. The lower ends of two steel wire ropes are passed through the movable clamps on each section of the coal chute pipe and fixed to the lowest section of the casing. The upper ends of the two steel wire ropes are connected to two winches respectively. The lower end of the coal chute pipe extends into the coal bunker through the feed port. The second step involves using a continuous coal mining machine to cut coal at the working face. The raw coal is transported to the coal chute for unloading via a shuttle car. The raw coal in the coal chute is buffered and diverted by a diverting shovel upon reaching the lower bend. Pulverized coal falls directly into the coal bunker through the screen holes on the diverting shovel, while lumpy coal passes over the diverting shovel and hits the buffer, then is thrown towards the energy dissipation plate. The energy dissipation plate removes the kinetic energy, and the coal falls into the coal bunker. The raw coal in the coal bunker enters the main transport roadway via a coal feeder. The third step is to remove a section of the casing from the top of the coal chute after one mining cycle. Fourth, repeat steps two and three until the coal conveying work of the raw coal being mined from the working face is completed.

[0017] This invention utilizes the combined use of coal chutes and coal bunkers to transport mined raw coal through coal chutes, which then sequentially pass through a diversion shovel for screening, an elastic buffer for buffering, and an energy dissipation plate for energy dissipation before falling into the coal bunker, thus completing the coal conveying task of the vertical coal face.

[0018] The beneficial effects of this invention are: (1) This invention solves the problem of raw coal transportation in vertical coal mining face by transporting raw coal through large-stage coal chute, replacing the traditional belt conveyor and original self-flowing device; (2) A coal chute is installed inside the coal chute. The design adopts wear-resistant steel sleeve, bend buffer, shovel diversion screen and elastic buffer to solve the problem of large-stage coal chute impact force and realize coal conveying in coal chute >100m. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the main structure of the present invention.

[0020] Appendix Figure 2 For the appendix Figure 1 A magnified structural diagram at point A.

[0021] Appendix Figure 3 For the appendix Figure 1 Enlarged structural diagram of the middle diversion shovel.

[0022] Appendix Figure 4 For the appendix Figure 1 Enlarged structural diagram of the central energy dissipation panel.

[0023] Appendix Figure 5 This is a three-dimensional structural diagram of the present invention.

[0024] Appendix Figure 6 This is a schematic diagram of the three-dimensional structure of the upper part of the present invention. Figure 1 .

[0025] Appendix Figure 7 This is a schematic diagram of the three-dimensional structure of the upper part of the present invention. Figure 2 .

[0026] Appendix Figure 8This is a three-dimensional structural diagram of adjacent sleeve sections installed together in this invention.

[0027] Appendix Figure 9 For the appendix Figure 8 A partially enlarged structural diagram.

[0028] Appendix Figure 10 This is a three-dimensional structural diagram of the lower part of the present invention.

[0029] Appendix Figure 11 For the appendix Figure 10 A partially enlarged structural diagram.

[0030] The codes in the attached diagram are as follows: 1 is coal chute, 2 is feed hopper, 3 is grid, 4 is gas and dust monitoring device, 5 is conveying device, 6 is dust outlet, 7 is bend, 8 is diverter shovel, 9 is screen hole, 10 is guide rib, 11 is coal bunker, 12 is cover plate, 13 is feed inlet, 14 is steel beam, 15 is support beam, 16 is elastic buffer, 17 is energy dissipation plate, 18 is lidar coal level detector, 19 is air cannon, 20 is coal feeder, 21 is stone gate, 22 is casing, and 23 is movable retaining ring. Detailed Implementation

[0031] This invention is not limited to the following embodiments; specific implementation methods can be determined according to the technical solution and actual conditions of this invention. This invention defines steeply inclined coal seams with an inclination angle of 60° to 90° as "vertical channel coal".

[0032] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0033] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1, as shown in the attached document Figure 1 , 5 As shown in Figures 6, 7, 8, 9, 10, and 11, the large-stage coal chutes of this vertical coal face fully mechanized mining face include at least two coal chutes arranged along the dip direction of the coal seam, directly connecting to the lower boundary of the coal seam mining level. A coal chute pipe 1 is installed inside each coal chute. An anti-blocking device is installed at the upper end of the coal chute, and a buffer device is installed at the lower end. The upper inlet of the coal chute is located within the cut-out, and the coal chute connects the upper and lower boundaries of the vertical coal face. In this way, the mined raw coal is transported through the coal chutes, completing the coal conveying task of the vertical coal face.

[0034] The above embodiment 1 can be further optimized and / or improved according to actual needs: As attached Figure 1 , 2 As shown in Figures 5, 6, and 7, the anti-clogging device includes a feed hopper 2 and a grid 3. The feed hopper 2 is installed at the upper end of the coal chute, and the grid 3 is installed at the upper end of the feed hopper 2; or / and, a gas and dust monitoring device 4 and a carbon monoxide detector are installed on the inner side of the upper part of the coal chute; or / and, a conveying device 5 and an iron remover are located above the corresponding coal chute. The aperture of the grid 3 can be less than or equal to the inner diameter of the smallest end of the feed hopper 2. The gas and dust monitoring device 4 can be a mine dust concentration sensor; the carbon monoxide detector can be a mine carbon monoxide sensor.

[0035] As attached Figure 1 , 2 As shown in Figures 5, 6, and 7, the feeding hopper 2 is a double-layered hopper. A dust outlet 6, connected to the inner cavity, is located on the upper outer side of the feeding hopper 2. A dust collector is installed at the dust outlet 6 of the feeding hopper 2. The double-layered hopper can be a known and commonly used type, with the tops connected together and a gap between the two layers. During operation, coal dust flows through the gap and out through the dust outlet 6, and is then processed by the dust collector.

[0036] As attached Figure 1 , 3 As shown in Figures 10 and 11, the buffer device includes a bent pipe 7, a diversion shovel 8, an elastic buffer 16, and an energy dissipation plate 17. The bent pipe 7 and the diversion shovel 8 are installed sequentially from top to bottom at the lower end of the coal chute. The angle between the lower end of the bent pipe 7 and the horizontal plane is 30° to 35°. Screen holes 9 are distributed at the bottom of the diversion shovel 8, and at least three guide ribs 10 are arranged axially on the upper surface of the bottom of the diversion shovel 8.

[0037] As attached Figure 1 , 4As shown in Figures 5, 10, and 11, a coal bunker 11 is located below the coal chute, and a cover plate 12 is located on the top of the coal bunker 11. A feed inlet 13 is located on the left side of the cover plate 12. The lower end of the coal chute 1 passes through the feed inlet 13 and extends into the coal bunker 11. A steel beam 14 is located at the bottom of the cover plate 12, and the lower part of the coal chute 1 is fixed to the steel beam 14. A support beam 15 is installed on the upper part of the coal bunker 11, and a diversion shovel 8 is installed on the support beam 15. Two rows of elastic buffers 16 are suspended in the left-right direction at the bottom middle part of the cover plate 12. The two adjacent elastic buffers 16 are staggered. An energy dissipation plate 17 with a lower left side and a higher right side is installed on the inner wall of the right side of the coal bunker 11. The elastic buffers 16 and the energy dissipation plate 17 correspond to the discharge end of the diversion shovel 8. In this way, through the combined use of the coal chute and the coal bunker 11, the mined raw coal is transported through the coal chute, and then successively screened by the diversion shovel 8, buffered by the elastic buffer 16, and dissipated by the energy dissipation plate 17 before falling into the coal bunker 11, thus completing the coal conveying task of the vertical trough coal working face; the energy dissipation plate 17 can be made of mining scrap steel rails arranged side by side; the energy dissipation plate 17 can be installed in the coal bunker 11 by means of a bracket or telescopic device, so that the distance of the energy dissipation plate 17 can be adjusted according to the actual situation. The diversion shovel 8 can be a pipe of the same diameter as the coal chute 1, which is broken open from the top and becomes a gradually widening fan-shaped shovel structure. The energy dissipation plate 17 is arranged directly in front of the outlet of the diversion shovel 8. The distance between the energy dissipation plate 17 and the diversion shovel 8 is positively correlated with the height difference of the working face and is adjustable to prevent the coal flow from rushing directly into the coal bunker 11 without buffering. A suspended flexible elastic buffer 16 is provided between the energy dissipation plate 17 and the diversion shovel 8. The shovel surface of the diversion shovel 8 is provided with guide ribs 10 and screen holes 9 to perform preliminary diversion and screening of the coal flow and slow down the coal flow speed. Then, the elastic buffer 16 consumes the kinetic energy of the coal flow. The coal flow after being buffered by the elastic buffer 16 is thrown towards the energy dissipation plate 17. The energy dissipation plate 17 can be set at a horizontal angle of 60° opposite to the coal flow. The pulverized coal layer retained by the slope angle of the energy dissipation plate 17 provides the final buffer, allowing the raw coal to fall freely into the coal bunker 11. The elastic buffer 16 can be similar to a hanging curtain. The elastic buffer 16 can be composed of at least three buffer blocks connected in series by hanging ropes. A layer of rubber can be fixed on the outside of each buffer block. The coal bunker 11 is located within the roof rock of the coal seam. A cover plate 12 is provided on the top of the coal bunker 11, which can be opened and closed by a hoist.

[0038] As attached Figure 1 , 5As shown in Figures 10 and 11, a gas and dust monitoring device 4 and a lidar coal level detector 18 are respectively installed between the wall of the coal bunker 11 and the bend 7; or / and, at least two sets of air cannons 19 are symmetrically installed on the lower outer side of the coal bunker 11, with the firing ends of the air cannons 19 located inside the coal bunker 11; or / and, at least two sets of air cannons 19 are symmetrically installed on the lower outer side of the coal bunker 11, with air guns mounted on the air cannons 19, and the air guns located inside the coal bunker 11; or / and, a discharge port is provided at the bottom of the coal bunker 11, and a coal feeder 20 is installed at the discharge port of the coal bunker. The gas and dust monitoring device 4, the lidar coal level detector 18, and the air cannons 19 are all publicly known and commonly used; the coal feeder 20 is connected to the transport roadway through a stone gate to continuously transport raw coal. Each set of air cannons 19 can have four; the air cannons 19 can be mine air cannons. The coal bunker 11 is closed at the top and connected to the main transport roadway via a coal feeder 20 and a stone gate 21 at the bottom. The coal bunker 11 is covered with a steel plate, which can be opened and closed by a crane. A monitoring system is located behind the diversion shovel 8 inside the coal bunker 11 to monitor the working environment in real time. Detectors may include gas, dust, and a lidar coal level detector 18. The lidar can detect coal accumulation on the energy dissipation plate 17 and the coal level height in the coal bunker 11. The lower inner wall of the coal bunker 11, where it connects to the coal feeder 20, has a gradually narrowing hyperbolic structure. Multiple mine air cannons are installed on the hyperbolic wall to prevent blockage. Controlled coal discharge is achieved using the coal feeder 20 connected at the bottom. The lidar coal level detector 18 can be an intrinsically safe mine-use radar level gauge.

[0039] As attached Figure 1 , 5 As shown in Figures 8 and 9, the coal chute 1 is made of wear-resistant steel; or / and, the coal chute 1 consists of several sections of sleeve 22 connected end to end and capable of quick assembly and disassembly. The length of each sleeve 22 matches the coal mining height of one cycle of the coal mining machine. Two movable retaining rings 23 are symmetrically arranged on the outer side of the end of each sleeve 22. The sleeve 22 can be a known and commonly used threaded sleeve 22, or it can be a sleeve 22 with a socket-rotation structure for quick connection and disassembly.

[0040] Example 2, as shown in the attached document Figure 1 , 2 As shown in Figures 3, 4, 5, 6, 7, 10, and 11, the coal conveying method for the large-stage coal chute in this vertical coal seam fully mechanized mining face is carried out according to the following steps: The first step is to arrange at least two coal chutes that run straight to the lower boundary of the coal seam mining level in the coal seam of the vertical coal face along the dipping direction of the coal seam. A coal chute 1 is installed in the coal chute. The lower ends of two steel wire ropes are passed through the movable retaining rings 23 on each section of the coal chute 1 and fixed to the lowest section of the casing 22. The upper ends of the two steel wire ropes are connected to two winches respectively. The lower end of the coal chute 1 passes through the feed port 13 and extends into the coal bunker 11. The second step involves using a continuous coal mining machine to cut coal at the working face. The raw coal is transported to the coal chute for unloading via a shuttle car. The raw coal in the coal chute is buffered at the lower bend 7 and diverted by the diverting shovel 8. Pulverized coal falls directly into the coal bunker 11 through the screen holes 9 on the diverting shovel 8. Lump coal passes over the diverting shovel 8 and hits the elastic buffer 16, and then is thrown towards the energy dissipation plate 17. The kinetic energy is dissipated by the energy dissipation plate 17 and the coal falls into the coal bunker 11. The raw coal in the coal bunker 11 enters the transport roadway through the coal feeder. The third step is to remove a section of the casing 22 from the top of the coal chute 1 after one mining cycle. Fourth, repeat steps two and three until the coal conveying work of the raw coal being mined from the working face is completed.

[0041] During the coal conveying process, the coal chute inlet is managed under negative pressure by a dust collector, forming a local air circulation system to suppress dust generated during coal unloading. Iron objects and large pieces of gangue are strictly prohibited from entering the coal chute during the coal conveying process. Coal unloading must be stopped immediately when the coal bunker 11 reaches the preset height or when coal accumulates on the energy dissipation plate 17. If the gas concentration in the coal bunker 11 or the coal chute exceeds the standard, operations must be stopped immediately, ventilation strengthened, and production can only resume after the indicators return to normal.

[0042] Design and verification of the diameter and wall thickness of coal chute 1: Design rules for the diameter and wall thickness of the coal chute. The diameter should primarily meet the maximum hourly production capacity and the maximum conveying capacity when two shuttle cars are unloading simultaneously; the diameter should not exceed Φ2m. The pipe wall thickness should comprehensively consider wear during coal transport and the pressure borne by the pipe at its maximum burial depth. Wear is related to the hardness of the coal and gangue mixture, while vertical pressure is related to the weight of the upper pipe or the combined vertical and horizontal pressure.

[0043] I. Explanation of Known Basic Parameters Let the pipe's outer diameter be D = d + 2a (where d is the inner diameter and a is the wall thickness). Pipe inner diameter: d; Pipe wall thickness: a; Natural bulk density of coal: In engineering projects where the coal seam is deeply buried and there are no special instructions, the average bulk density of saturated coal is determined based on the actual conditions of the coal mine. For design purposes, γ is temporarily taken as 20 kN / m³. 3 When calculating, the average unit weight near the burial depth of the vertical trench should be taken, or an approximate range can be used.

[0044] Lateral pressure coefficient of coal (horizontal coal pressure core coefficient): The static coal pressure at deep burial sites is taken as the static coal pressure coefficient. K 0.

[0045] II. Formula for Calculating Horizontal Static Coal Pressure For vertically buried pipes, the coal around the pipes is under static lateral pressure. Active and passive limit states are not considered; only the horizontal normal compressive stress is calculated.

[0046] 1. Horizontal coal pressure intensity Burial depth H At this location, the horizontal compressive stress in the coal seam is: Horizontal uniform compressive stress, unit kN / m 2 (kPa) K 0: Static coal pressure coefficient, or lateral pressure coefficient : Bulk density of coal H Pipeline center burial depth (calculated directly based on a maximum burial depth of 1000m). Substituting the burial depth and recommended bulk density, first calculate the pressure: Conservative approach K 0 = 0.7: .

[0047] III. Formula for Circumferential Stress in a Steel Circular Tube under Uniform External Pressure The circular tube is subjected to uniform horizontal external pressure The pipe wall generates circumferential compressive stress, which is derived based on the thin-walled circular pipe (satisfying a≪D, which is basically satisfied for engineering steel pipes).

[0048] 1. Formula for calculating circumferential stress Taking a unit length of pipe (L=1m) for analysis, the circumferential compressive stress of the pipe wall is obtained from force balance: Circumferential compressive stress in the pipe wall, in Pa or MPa D=d+2a: Pipe outer diameter a: Pipe wall thickness Horizontal coal compressive stress 2. Strength verification criteria The external pressure circumferential stress of the steel pipe must meet the following requirements: [σ] represents the allowable compressive stress in steel, a value commonly used for structural steel in engineering (according to conventional design specifications): Q235 steel: [σ]≈140 MPa; Q345 steel: [σ]≈215 MPa.

[0049] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A large-stage coal chute for a vertical coal seam fully mechanized mining face, characterized in that... This includes coal chutes arranged in the coal seam of the vertical coal face, with at least two coal chutes arranged along the dip direction of the coal seam, directly reaching the lower boundary of the coal seam mining level. Coal chute pipes are installed in the coal chutes, anti-blocking devices are installed at the upper end of the coal chutes, and buffer devices are installed at the lower end of the coal chutes.

2. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 1, characterized in that... The anti-clogging device includes a feeding hopper and a grid. The feeding hopper is installed at the upper end of the coal chute, and the grid is installed at the upper end of the feeding hopper; or / and, a gas and dust monitoring device and a carbon monoxide detector are respectively installed on the upper inner side of the coal chute; or / and, a conveying device and an iron removal device are provided above the corresponding coal chute.

3. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 2, characterized in that... The feeding hopper is a double-layered hopper. A dust outlet connected to the inner cavity is provided on the upper outer side of the feeding hopper, and a dust collector is installed at the dust outlet of the feeding hopper.

4. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 1, 2, or 3, characterized in that... The buffer device includes a bend, a diversion shovel, an elastic buffer, and an energy dissipation plate. The bend and the diversion shovel are installed sequentially from top to bottom at the lower end of the coal chute. The angle between the lower end of the bend and the horizontal plane is 30° to 35°. Screen holes are distributed at the bottom of the diversion shovel, and at least three guide ribs are arranged axially on the upper surface of the bottom of the diversion shovel.

5. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 4, characterized in that... A coal bunker is located below the coal chute, and a cover plate is installed on top of the coal bunker. A feed inlet is located on the left side of the cover plate. The lower end of the coal chute pipe extends into the coal bunker through the feed inlet. A steel beam is installed at the bottom of the cover plate, and the lower part of the coal chute pipe is fixed to the steel beam. A support beam is installed on the upper part of the coal bunker, and a diversion shovel is installed on the support beam. Two rows of elastic buffers are suspended in the left and right directions at the bottom middle of the cover plate. The two adjacent elastic buffers are staggered. An energy dissipation plate with a lower left side and a higher right side is installed on the inner wall of the right side of the coal bunker. The elastic buffers and energy dissipation plate correspond to the discharge end of the diversion shovel.

6. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 5, characterized in that... A gas and dust monitoring device and a lidar coal level detector are installed between the coal bunker wall and the bend pipe, respectively; or / and, at least two sets of air cannons are symmetrically installed on the lower outer side of the coal bunker, and air guns are installed on the air cannons, with the air guns located inside the coal bunker; or / and, a discharge port is provided at the bottom of the coal bunker, and a coal feeder is installed at the discharge port of the coal bunker.

7. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 1, 2, or 3, characterized in that... The coal chute is made of wear-resistant steel; or / and, the coal chute consists of several sections of sleeve connected end to end and capable of quick assembly and disassembly. The length of each sleeve section matches the coal mining height of one cycle of the coal mining machine. Two movable retaining rings are symmetrically arranged on the outer side of the end of each sleeve section.

8. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 4, characterized in that... The coal chute is made of wear-resistant steel; or / and, the coal chute consists of several sections of sleeve connected end to end and capable of quick assembly and disassembly. The length of each sleeve section matches the coal mining height of one cycle of the coal mining machine. Two movable retaining rings are symmetrically arranged on the outer side of the end of each sleeve section.

9. The large-stage coal chute of the vertical coal seam fully mechanized mining face according to claim 6, characterized in that... The coal chute is made of wear-resistant steel; or / and, the coal chute consists of several sections of sleeve connected end to end and capable of quick assembly and disassembly. The length of each sleeve section matches the coal mining height of one cycle of the coal mining machine. Two movable retaining rings are symmetrically arranged on the outer side of the end of each sleeve section.

10. A method for conveying coal through a large-stage coal chute in a vertical coal seam fully mechanized mining face according to claim 7, 8, or 9, characterized in that... Follow these steps: The first step is to arrange at least two coal chutes that run straight to the lower boundary of the coal seam mining level in the coal seam of the vertical coal face along the diagonal direction of the coal seam. Coal chute pipes are installed in the coal chutes. The lower ends of two steel wire ropes are passed through the movable clamps on each section of the coal chute pipe and fixed to the lowest section of the casing. The upper ends of the two steel wire ropes are connected to two winches respectively. The lower end of the coal chute pipe extends into the coal bunker through the feed port. The second step involves using a continuous coal mining machine to cut coal at the working face. The raw coal is transported to the coal chute for unloading via a shuttle car. The raw coal in the coal chute is buffered and diverted by a diverting shovel upon reaching the lower bend. Pulverized coal falls directly into the coal bunker through the screen holes on the diverting shovel, while lumpy coal passes over the diverting shovel and hits the buffer, then is thrown towards the energy dissipation plate. The energy dissipation plate removes the kinetic energy, and the coal falls into the coal bunker. The raw coal in the coal bunker enters the main transport roadway via a coal feeder. The third step is to remove a section of the casing from the top of the coal chute after one mining cycle. Fourth, repeat steps two and three until the coal conveying work of the raw coal being mined from the working face is completed.

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