Underground crushing chamber dust removal device and method

Abstract

The invention relates to the technical field of underground crushing chamber dust removal, and particularly discloses an underground crushing chamber dust removal device which comprises the following components: a full-wrapping bin arranged in a crushing chamber, the full-wrapping bin comprises a discharging chamber, a draw shaft connected with the discharging chamber, a switch valve arranged at the free end of the draw shaft and a bin body connected with the output end of the switch valve, a plate type ore feeder and a crusher are arranged in the bin body, a partition plate is arranged above the plate type ore feeder, a notch is formed in the partition plate and located above the crushing end of the crusher, and the opening and the closing valve are arranged in the bin body. A stock bin is arranged at the output end of the crusher; the free end of the air return shaft is located on the ground and connected with an exhaust fan; according to the device, the problem that dust escape still cannot be effectively treated due to the fact that the crushing chamber is directly connected with the air inlet way and the air return way in a traditional negative pressure difference mode for dust removal is solved.

Description

Technical Field

[0001] This application relates to the field of dust removal technology for underground crushing chambers, and specifically discloses a dust removal device and method for underground crushing chambers. Background Technology

[0002] Underground crushing chambers are specialized structures created by artificial excavation in underground rock and soil during mining or underground engineering construction. They are specifically designed for crushing large materials and serve as the core site for underground material pretreatment.

[0003] The core function of an underground crushing chamber is to crush large materials generated during underground mining or excavation, such as gangue from coal mining or large rocks from tunnel excavation, to the required particle size so that they can be used for subsequent backfilling of goaf areas, underground transportation, or other resource utilization, thus avoiding the high lifting costs associated with material crushing at the surface.

[0004] Underground crushing chambers are typical high-dust work sites. During the crushing of gangue and soil, a large amount of suspended dust is generated. The powder and large particles can be directly inhaled by the workers, causing damage to their health. The crushing of gangue is an operation with extremely high dust generation. The large amount of dust causes great harm to workers. The dust generated by underground crushing is mostly respirable dust, which can directly penetrate the human respiratory barrier. Long-term inhalation can cause irreversible diseases such as pneumoconiosis, pulmonary fibrosis, and bronchitis, and even endanger life. Moreover, the underground space is closed and the ventilation conditions are limited. After the dust spreads, it is difficult to dissipate naturally. Workers are exposed to high dust environments for a long time, and the health risks increase exponentially.

[0005] Chinese Publication No. CN105317453B discloses a dust removal method for crushing gangue in an underground coal mine chamber. The method includes: a. constructing a crushing chamber connecting the intake and return airways; b. installing an exhaust fan in the return airway, with the fan duct connected to the crushing chamber; c. installing a regulating door on the side connecting the crushing chamber to the return airway. This invention improves the mine ventilation system by designing a crushing chamber between the intake and return airways, ensuring that gangue enters and exits upwind of the crusher, resulting in fresher air. Dust generated during gangue crushing is directly carried into the return air system by the airflow. Throughout the process, workers are not exposed to dust, protecting their health. This invention enables gangue crushing to be carried out directly underground, reducing mine hoisting costs. The core of this solution lies in its reliance on ventilation system modifications, reducing investment in dust removal equipment and other related aspects.

[0006] The core of the aforementioned dust removal method lies in using negative pressure to allow gangue dust to enter the return airway. However, this method is not practical. Firstly, the intake airway is crucial for miners' survival, as all clean air passes through it. Connecting the intake and return airways via the crushing chamber cannot guarantee that all dust will be drawn into the return airway under negative pressure. Once the large crusher starts operating, the dust escape direction becomes uncontrollable. Furthermore, the negative pressure difference affects not only the dust but also the workers in the crushing chamber. To draw all dust into the return airway under negative pressure, a high pressure difference is required, which causes discomfort to the workers. Moreover, the dust escape direction remains uncontrollable, and the dust remains exposed to the intake airway system, still causing physical harm to the workers. Therefore, this invention provides a dust removal device for underground crushing chambers to solve the aforementioned problems. Summary of the Invention

[0007] The purpose of this invention is to solve the problem that the traditional method of directly connecting the pulverizing chamber to the intake and return airways for dust removal via negative pressure difference still cannot effectively handle dust escape.

[0008] To achieve the above objectives, the present invention provides the following basic solution: A dust removal device for an underground crushing chamber includes the following components: A fully enclosed bin is installed inside the crushing chamber. The fully enclosed bin includes a discharge chamber, a chute connected to the discharge chamber, a switch valve located at the free end of the chute, and a bin body connected to the output end of the switch valve. A plate feeder and a crusher are installed inside the bin body. A partition is installed above the plate feeder, and the partition has a notch located above the crushing end of the crusher. A hopper is installed at the output end of the crusher. A return air shaft connected to the fully enclosed warehouse, the free end of which is located on the ground and connected to an exhaust fan; An exhaust system for controlling the direction of dust is installed between the return air shaft and the fully enclosed chamber. The exhaust system includes an exhaust component and an exhaust component. Before the crusher is started, the exhaust component is activated to prevent dust from escaping upwards. When the crusher is started, the exhaust component is activated to control the direction of dust.

[0009] Furthermore, the crushing chamber is a sunken crushing chamber, which includes a first working face and a second working face. The discharge port of the unloading chamber is located on the first working face, and the outlet end of the hopper is located on the second working face. The crushing chamber is equipped with a switch door, which is located on the first working face. A transportation device for transporting personnel is provided between the second working face and the first working face. A ventilation duct is provided inside the crushing chamber.

[0010] Furthermore, the transportation device is an elevator and elevator accessories.

[0011] Furthermore, it also includes support components, one end of which is connected to the crushing chamber, and the other end of which is connected to the unloading chamber, the chute, and the silo body respectively. The inner wall of the silo body is provided with several connecting components, and the free end of the connecting components is connected to the partition plate.

[0012] Furthermore, the switch valve located at the free end of the chute is connected to the baffle plate, and the outlet end of the crusher is located inside the hopper.

[0013] Furthermore, the air extraction assembly includes an air extraction cavity, an air extraction pipe, and an air extraction machine. The inner wall of the air extraction cavity is connected to a plurality of first gas pipes, and the free end of the first gas pipes is connected to the chute.

[0014] Furthermore, the exhaust assembly includes an exhaust cavity, an exhaust pipe, and an exhaust motor. The inner wall of the exhaust cavity is connected to a plurality of second gas pipes. The free ends of the second gas pipes are connected to a chute, and the installation height of the first gas pipe is lower than the installation height of the second gas pipes.

[0015] Furthermore, the exhaust fan has a first chamber at one end and the air extraction fan has a second chamber at the other end. The first chamber and the second chamber are integrated. An electric control valve is provided between the first chamber and the second chamber. A master control valve is provided at the other end of the second chamber. The other end of the master control valve is connected to the return air shaft.

[0016] This application also discloses a method for using a dust removal device for an underground crushing chamber, comprising the following steps: Step S01: Prepare the gangue to be crushed, transport it into the crushing chamber through the open and closed door, and then put it into the unloading chamber. After putting it in, start the air extraction component to prevent the dust of the gangue from escaping upward along the chute during the falling process. Step S02: Open the switch valve, and the gangue reaches the crusher through the plate feeder. Start the crusher and crush the gangue. Step S03: Start the crusher and simultaneously start the exhaust assembly. The exhaust assembly acts at the notch of the partition plate to change the direction of the dust during gangue crushing, and discharges the dust during gangue crushing into the first chamber. Open the electric control valve and close the exhaust assembly. The dust in the first chamber enters the second chamber. Step S04: After all the gangue has been crushed, open the main control valve and start the exhaust fan. The dust will be discharged to the ground through the return air shaft and collected by the dust collector.

[0017] Furthermore, in step S04, while starting the exhaust fan, the exhaust assembly is not turned off, and the exhaust flow rate of the exhaust assembly is less than the exhaust flow rate of the exhaust fan.

[0018] The principle and effect of this solution are as follows: 1. Compared with existing technologies, the core of this invention is that it does not connect the intake and return airways to the crushing chamber. The intake airway still serves as the core for ventilation and maintaining air quality for workers. This device constructs a closed-loop dust control system to block the dust diffusion path from the source: the fully enclosed bin seals the entire process of unloading, chute conveying, crushing, and discharge, preventing dust from overflowing; the dust is concentrated and collected in the return airway, and finally treated by the ground dust collector. The high and low position layout and flow coordination of the air extraction and exhaust components form a directional airflow field, realizing precise dust control throughout the entire process of "preventing material escape during feeding, controlling the flow direction during crushing, and concentrated and strong discharge". This solves the problem that the traditional method of directly connecting the crushing chamber to the intake and return airways through negative pressure difference still cannot effectively deal with dust escape.

[0019] 2. Compared with the existing technology, this device is a large-scale underground crushing chamber for mining, with a first working face and a second working face. The feeding is set on the first working face and the discharge is set on the second working face. It is equipped with a fully enclosed chamber to make the crushing process independent, so that the gas flow in the crushing process is isolated from the air required by the workers, and the two do not interfere with each other and are independent of each other.

[0020] 3. Compared with existing technologies, the sunken crushing chamber design is adaptable to different geological conditions underground. The robust connection between the support components and the chamber ensures stable operation of the device in complex underground stress environments. The modular structure of the fully enclosed chamber can be flexibly adjusted according to the space dimensions of the underground chamber. The combination of the plate feeder and the crusher can adapt to the crushing requirements of gangue of different particle sizes. At the same time, the design of the ventilation ducts and the device is compatible with the existing ventilation system of the mine, without the need for large-scale modification of underground infrastructure. It has a wide range of applications and can be widely used in dust removal operations in various types of underground crushing chambers in coal mines.

[0021] 4. Compared with existing technologies, the submerged chamber's multi-face design enables unloading, crushing, and discharge. The door is only located on the first working face, which, together with the elevator, transports personnel and prevents workers from directly contacting the dust-generating area. The fully enclosed chamber's sealed structure, combined with ventilation ducts, effectively isolates dust from the work space, preventing personnel from inhaling dust and causing health risks. It also prevents dust from mixing with harmful gases such as underground methane to create an explosion hazard. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1A schematic diagram of the arrangement of a dust removal device for an underground crushing chamber according to an embodiment of this application is shown; Figure 2 This paper shows a plan view of a dust removal device for an underground crushing chamber according to an embodiment of this application; Figure 3 This paper shows a schematic diagram of the exhaust mechanism in a dust removal device for an underground crushing chamber according to an embodiment of this application. Figure 4 The diagram shows a plan view of the exhaust cavity and the extraction cavity in a dust removal device for an underground crushing chamber according to an embodiment of this application. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] The reference numerals in the accompanying drawings include: 1. Return air shaft; 2. Crushing chamber; 3. Connecting surface; 4. Support component; 5. First working face; 6. Second working face; 7. Worker; 8. Ventilation duct; 9. Elevator; 10. Unloading chamber; 11. Chute; 12. Fixed base; 13. Fully enclosed bin; 14. Crusher; 15. Hopper; 16. Switch valve; 17. Plate feeder; 18. Partition; 19. Switch door; 20. Track; 21. Transport vehicle; 22. Fire door; 23. Waiting area; 24. Explosion-proof door; 25. Main passage; 26. Power generation room; 27. Air preheating room; 28. Equipment room; 29. ​​Communication room; 30. Escape room; 31. Air extraction and exhaust mechanism; 32. Air extraction pipe; 33. Exhaust pipe; 34. Air extraction machine; 35. Exhaust machine; 36. Electrically controlled valve; 37. Main control valve; 38. Air extraction cavity; 39. Exhaust cavity; 41. First gas pipe; 42. Second gas pipe.

[0026] Implementation, for example Figure 2 As shown: Before introducing this case, let's first introduce the layout of the underground coal mine, such as... Figure 2 As shown, a track 20 is provided, and a transport vehicle 21 is installed on the track 20. This is a basic setup for underground coal mines, mainly used to transport personnel underground for coal mining or tunneling operations. Ventilation is also provided through this track 20, which allows ventilation to reach various locations.

[0027] like Figure 2 As shown, Figure 2The plan layout of an underground crushing chamber 2 is shown in the figure. First, personnel transport gangue to this crushing area, then open the fire door 22, and then open the explosion-proof door 24 to enter the interior of the underground crushing chamber 2. The interior of this underground crushing chamber 2 is usually equipped with a power generation room 26, an air preheating room 27, an equipment room 28, an escape room 30, a communication room 29, and the crushing chamber 2. The power generation room 26, the air preheating room 27, the equipment room 28, the escape room 30, the communication room 29, and the crushing chamber 2 are connected by a main passage 25. The main passage 25 is connected to the track 20 to achieve ventilation to all parts.

[0028] One of the improvements in this application is that a return air shaft 1 is provided on one side of the crushing chamber 2 to collect dust. Similarly, both the fire door 22 and the explosion-proof door 24 are double-set. For a transport crushing team, the material enters the underground crushing chamber 2 and waits for crushing. The crushed material then passes through the fire door 22 and the explosion-proof door 24 on the other side to reach the waiting area 23. From the waiting area 23, it enters the track 20 and then takes the transport vehicle 21 to the area where gangue is needed.

[0029] like Figure 2 As shown: Figure 2 The crushing chamber 2 is shown. The crushing chamber 2 is a sunken crushing chamber 2, which includes a first working face 5 and a second working face 6. The discharge port of the unloading chamber 10 is located on the first working face 5, and the outlet end of the hopper 15 is located on the second working face 6. The crushing chamber 2 is equipped with a switch door 19, which is located on the first working face 5. A transportation device for transporting personnel is provided between the second working face 6 and the first working face 5. A ventilation duct 8 is provided inside the crushing chamber 2, and the transportation device is an elevator 9 and elevator 9 accessories.

[0030] Specifically: Worker 7 opens the switch door 19 located on the main passage 25 and directly enters the crushing chamber 2. Then, the gangue is fed into the unloading chamber 10 for unloading. After all the gangue has been fed in, the worker takes elevator 9 to the second working face 6, waits for the crushed material to be completely crushed, and then collects the crushed material. Figure 2 As shown, ventilation duct 8 is connected to main channel 25, mainly to achieve ventilation and ensure the basic life activities of staff 7.

[0031] like Figure 1 , Figure 3 , Figure 4As shown, a fully enclosed bin 13 is provided inside the crushing chamber 2. The fully enclosed bin 13 is installed on a fixed base 12. The fully enclosed bin 13 includes a discharge chamber 10, a chute 11 connected to the discharge chamber 10, a switch valve 16 located at the free end of the chute 11, and a bin body connected to the output end of the switch valve 16. A plate feeder 17 and a crusher 14 are provided inside the bin body. A partition 18 is provided above the plate feeder 17. A notch is provided on the partition 18. The notch is located above the crushing end of the crusher 14. A hopper 15 is provided at the output end of the crusher 14. The switch valve 16 located at the free end of the chute 11 is connected to the partition 18. The outlet end of the crusher 14 is located inside the hopper 15.

[0032] As mentioned above, worker 7 feeds material into unloading chamber 10. The material passes through chute 11 and reaches switch valve 16. Switch valve 16 is opened, and the material reaches plate feeder 17. Through plate feeder 17, the material reaches crusher 14. Due to the design of the fully enclosed chamber 13, the material produced by crushing will not come into contact with worker 7, and worker 7's basic life activities can be guaranteed.

[0033] like Figure 1 As shown, the return air shaft 1 is connected to the fully enclosed compartment 13. The free end of the return air shaft 1 is located on the ground and connected to an exhaust fan. The exhaust fan generates negative pressure to draw dust into the return air shaft 1, and dust collection is completed through the return air shaft 1.

[0034] like Figure 1 As shown, the arrangement of the fully enclosed compartment 13 and the partition 18: It also includes a support member 4, one end of which is connected to the inner wall of the crushing chamber 2. The inner wall of the crushing chamber 2 is defined as the connecting surface 3. The other end of the support member 4 is connected to the unloading chamber 10, the chute 11 and the silo body respectively. The inner wall of the silo body is provided with several connecting members, and the free end of the connecting members is connected to the partition 18.

[0035] like Figure 3 As shown, an exhaust mechanism 31 for controlling the direction of dust is installed between the return air shaft 1 and the fully enclosed chamber 13. The exhaust mechanism 31 includes an exhaust component and an exhaust component. Before the crusher 14 is started, the exhaust component is activated to suppress the upward escape of dust. When the crusher 14 is started, the exhaust component is activated to control the direction of dust.

[0036] The extraction assembly includes an extraction cavity 38, an extraction pipe 32, and an extraction fan 34. The inner wall of the extraction cavity 38 is connected to several first gas pipes 41, and the free end of the first gas pipes 41 is connected to the chute 11. The exhaust assembly includes an exhaust cavity 39, an exhaust pipe 33, and an exhaust fan 35. The inner wall of the exhaust cavity 39 is connected to several second gas pipes 42, and the free end of the second gas pipes 42 is connected to the chute 11. The installation height of the first gas pipes 41 is lower than the installation height of the second gas pipes 42. Dust escaping upwards first comes into contact with the first gas pipes 41 and is then sucked up, preventing dust from contacting the second gas pipes and accumulating, which is conducive to the smooth flow of the second gas pipes. The other end of the exhaust fan 35 is provided with a first cavity, and the other end of the extraction fan 34 is provided with a second cavity. The first cavity and the second cavity are integrated. An electric control valve 36 is provided between the first cavity and the second cavity. The other end of the second cavity is provided with a master control valve 37, and the other end of the master control valve 37 is connected to the return air shaft 1.

[0037] Specifically: Because the switch valve 16 is not activated after the material is fed into the chute 11, the collision between the materials will generate dust. It is necessary to prevent the dust from overflowing upwards from the inlet of the unloading chamber 10. Therefore, an air extraction component is set up. When the air extraction fan 34 is turned on, the negative pressure acts on the air extraction pipe 32 and then on the air extraction cavity 38. Because the inner wall of the air extraction cavity 38 is connected to several first gas pipes 41, and the free end of the first gas pipe 41 is connected to the chute 11, the dust is drawn up by the first gas pipes 41 and then reaches the second cavity when it escapes upwards.

[0038] After all materials are fed in, the switch valve 16 is opened. The dust generated by the material collision is blocked by the baffle 18. The material reaches the plate feeder 17 and then the plate feeder 17 leads the material to the crusher 14. Then the switch valve 16 is closed, the exhaust assembly is closed, and the crusher 14 is started. The baffle 18 has a notch located above the crushing end of the crusher 14. The notch is in the direction in which the dust escapes upward. At this time, the exhaust assembly needs to be opened. The exhaust fan 35 generates gas. The gas blows through the chute 11 and the switch valve 16 through the inside of the baffle 18, thereby changing the direction in which the dust escapes upward, so that the dust is directed towards the first chamber on the left. At this time, the electric control valve 36 is opened, and the second chamber is connected to the first chamber. The dust enters the second chamber through the first chamber.

[0039] This embodiment also discloses a method for using a dust removal device in an underground crushing chamber 2, including the following steps: Step S01: Prepare the gangue to be crushed, transport it into the crushing chamber 2 through the opening and closing door 19, and then put it into the unloading chamber 10. After being put in, start the air extraction component to prevent dust from escaping upwards along the chute 11 during the falling process of the gangue; Step S02: Open the switching valve 16, and the gangue reaches the crusher 14 through the plate feeder 17. Start the crusher 14, and the crusher 14 crushes the gangue; Step S03: Start the crusher 14 simultaneously Start the exhaust assembly. The exhaust assembly acts at the notch of the partition 18 to change the direction of the dust during gangue crushing, and discharges the dust during gangue crushing into the first chamber. Open the electric control valve 36 and close the exhaust assembly. The dust in the first chamber enters the second chamber. Step S04: After all the gangue has been crushed, open the main control valve 37 and start the exhaust fan. The dust is discharged to the ground through the return air shaft 1 and collected by the dust collector. In step S04, the exhaust assembly is not closed while the exhaust fan is started. The exhaust flow rate of the exhaust assembly is less than the exhaust flow rate of the exhaust fan.

[0040] This device solves the problem that traditional dust removal methods, which directly connect the pulverizing chamber to the inlet and outlet airways via negative pressure difference, still fail to effectively address dust escape. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, shall still fall within the scope of the present invention.

Claims

1. A dust removal device for a broken chamber in a mine, characterized in that, Comprise the following component: The full package warehouse is arranged in the crushing chamber, the full package warehouse comprises a discharge chamber, a chute connected with the discharge chamber, an on-off valve arranged at the free end of the chute, and a warehouse body connected with the output end of the on-off valve, a plate feeder and a crusher are arranged in the warehouse body, a partition plate is arranged above the plate feeder, the partition plate is provided with a gap, the gap is located above the crushing end of the crusher, and a stock bin is arranged at the output end of the crusher; The return air shaft connected with the full package warehouse, the free end of the return air shaft is located on the ground and is connected with an air extractor; The air extraction and exhaust mechanism for controlling the dust direction is arranged between the return air shaft and the full package warehouse, the air extraction and exhaust mechanism comprises an air extraction assembly and an exhaust assembly, before the crusher is started, the air extraction assembly is started to prevent the dust from escaping upward along the chute during the falling of the gangue, and when the crusher is started, the exhaust assembly is started to control the dust direction.

2. A dust extraction device for a subterranean crushing chamber according to claim 1, characterised in that, The crushing chamber is a sunken crushing chamber, the sunken crushing chamber comprises a first working surface and a second working surface, the discharge port of the discharge chamber is located on the first working surface, the outlet end of the stock bin is located on the second working surface, the crushing chamber is provided with an on-off door, the on-off door is located on the first working surface, a transportation device for transporting personnel is arranged between the second working surface and the first working surface, and a ventilation pipeline is arranged in the crushing chamber.

3. A dust extraction device for a subterranean crushing chamber according to claim 2, characterised in that, The transportation device is an elevator and an elevator accessory.

4. A dust extraction device for a subterranean crushing chamber according to claim 2, characterised in that, Further comprising a supporting piece, one end of the supporting piece is connected to the crushing chamber, the other end of the supporting piece is connected to the discharge chamber, the chute and the warehouse body respectively, a plurality of connecting pieces are arranged on the inner wall of the warehouse body, and the free ends of the connecting pieces are connected to the partition plate.

5. A dust extraction device for a subterranean crushing chamber according to claim 4, wherein, The on-off valve arranged at the free end of the chute is connected to the partition plate, and the outlet end of the crusher is located in the stock bin.

6. A dust extraction device for a subterranean crushing chamber according to claim 5, wherein, The air extraction assembly comprises an air extraction cavity, an air extraction pipe and an air extractor, a plurality of first gas pipes are communicated with the inner wall of the air extraction cavity, and the free ends of the first gas pipes are communicated with the chute.

7. A dust extraction device for a subterranean crushing chamber according to claim 6, characterised in that, The exhaust assembly comprises an exhaust cavity, an exhaust pipe and an exhaust machine, a plurality of second gas pipes are communicated with the inner wall of the exhaust cavity, the free ends of the second gas pipes are communicated with the chute, and the installation height of the first gas pipes is lower than that of the second gas pipes.

8. A dust extraction device for a subterranean crushing chamber according to claim 7, characterised in that, The other end of the exhaust machine is provided with a first cavity, the other end of the air extractor is provided with a second cavity, the first cavity and the second cavity are integrated, an electric control valve is arranged between the first cavity and the second cavity, the other end of the second cavity is provided with a master control valve, and the other end of the master control valve is connected to the return air shaft.

9. A method of using a dust extraction device for an underground crushing chamber, using a dust extraction device for an underground crushing chamber according to any one of claims 3-8, characterized in that, Comprise the following steps: Step S01: preparing the gangue to be crushed, transporting into the crushing chamber from the on-off door, and then putting into the discharge chamber, after putting, starting the air extraction assembly to prevent the dust of the gangue from escaping upward along the chute during the falling; Step S02: opening the on-off valve, the gangue reaching the crusher through the plate feeder, starting the crusher, and the crusher crushing the gangue; Step S03: start the crusher and start the exhaust assembly, the exhaust assembly acts on the position of the partition gap to change the dust direction when the gangue is crushed, the dust generated when the gangue is crushed is discharged to the first cavity, the electric control valve is opened, the exhaust assembly is closed, and the dust in the first cavity enters the second cavity; Step S04: after all the gangue is crushed, the total control valve is opened, the exhaust fan is started, the dust is discharged to the ground through the return air shaft and collected by the dust collector.

10. A method of using a dust extraction apparatus for a subterranean crushing chamber according to claim 9, wherein, In step S04, the exhaust fan is started at the same time, and the exhaust assembly is not closed. The exhaust flow of the exhaust assembly is less than the exhaust flow of the exhaust fan.

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