Combined dust suppression system for metal ore unloading station, and using method

Abstract

A combined dust suppression system for a metal ore unloading station, and a using method. The combined dust suppression system consists of an ore unloading station tunnel wall surface accumulated dust high-pressure water flushing device, an ore unloading station tunnel floor spraying, watering, and wetting device, and an ore unloading station ore train floor bidirectional high-pressure spray dust suppression device. The ore unloading station tunnel wall surface accumulated dust high-pressure water flushing device is used for performing manual flushing on a tunnel by means of high-pressure water in the travel direction of an ore unloading train, the ore unloading station tunnel floor spraying, watering, and wetting device is used for performing spraying, watering, and wetting on the tunnel, and the ore unloading station ore train floor bidirectional high-pressure spray dust suppression device isolates dust generated during ore unloading at the ore unloading station. The water consumption can be reduced, excessive water in an ore unloading pit that causes adhesion and blockage can be effectively avoided, the field applicability of high-pressure spray dust suppression measures is improved, and on-demand spray dust removal of a high-pressure spray device is achieved; high-pressure water is used for flushing accumulated dust on the tunnel wall surfaces of ore unloading stations, and the tunnel floors of ore unloading stations are sprayed, watered, and wetted, thereby achieving significant comprehensive dust suppression and dust control effects, and notable energy-saving effects.

Description

A combined dust suppression system for metal mine unloading stations and its use method Technical Field

[0001] The present invention belongs to the technical field of energy conservation and environmental protection of underground mines, and specifically relates to a combined dust reduction device and a method of use for an underground unloading station in a metal mine. The device can be widely used in underground mines in mining industries such as ferrous, nonferrous, chemical, and coal. Background Art

[0002] As underground metal mines continue to increase production capacity, they are now operating simultaneously in multiple sections and stopes. Underground ore is transported by electric locomotive-drawn unloading trains to unloading stations, where the ore is subsequently unloaded separately. After being crushed in underground crushing chambers, the ore is hoisted to the surface via the main shaft. The unloading station consists of the unloading pit and its surrounding tunnels. The unloading pit specifically refers to the depression in the ground where the ore is unloaded. When trains unload ore at the unloading station, they generate a large amount of impact airflow, which sends large amounts of dust rushing through the open floor of the mine car to the tunnel roof. This airflow then carries the dust downwind, causing severe pollution to the underground air. If this dust is not effectively controlled and treated, it will remain suspended in the air for a long time, posing a serious threat to the physical and mental health of workers and seriously affecting underground mining safety.

[0003] In addition, dust is also generated during the transportation of underground ore, especially when transporting in dry tunnels with unhardened ground. A large amount of dust is generated and adheres to the tunnel walls. As time goes by, the amount of dust on the tunnel walls increases. When the mine is ventilated, the wall dust will float with the wind, causing serious pollution to the tunnel working environment.

[0004] Dust generation at unloading stations has long been a typical dust source in underground metal mine production. Currently, dust generation at unloading stations is typically addressed through technical solutions such as spray dust suppression and ventilation. Further analysis reveals the following deficiencies in these solutions:

[0005] 1) Traditional spray dust suppression only reduces the amount of dust generated during the operation of the unloading station, but cannot completely suppress the generation of dust. At the same time, the contact time between water mist and dust in the air is short, so traditional spray dust suppression is difficult to completely purify the dust in the unloading station;

[0006] 2) The use of ventilation and dust removal measures not only requires large engineering investment, high energy consumption, and is difficult to operate and maintain, but the ventilation and dust removal technical solution only considers the use of ventilation to dilute and remove dust at the work site, and fails to achieve dust purification at the unloading station.

[0007] Summary of the Invention

[0008] The purpose of the present invention is to provide a combined dust reduction system for metal mine unloading stations with high dust removal efficiency, low energy consumption and low operating costs, in order to achieve a new breakthrough in the field of dust removal technology for metal mine unloading stations, in order to address the problems of serious dust pollution in metal mine unloading stations, serious pollution caused by dust on the tunnel walls, poor dust removal effect of existing technologies, large project investment, high energy consumption and difficult operation and maintenance.

[0009] Another object of the present invention is to provide a method for using the above-mentioned combined dust reduction system for a metal mine unloading station.

[0010] To achieve the above-mentioned object of the present invention, the present invention provides a combined dust suppression system for a metal mine unloading station, which is composed of a high-pressure water washing device for dust on the wall of the unloading station tunnel, a water spraying and moisturizing device for the floor of the unloading station tunnel, and a two-way high-pressure spray dust suppression device for the floor of the mine car of the unloading station.

[0011] The high-pressure water flushing device for removing dust from the tunnel walls of the ore unloading station includes a tunnel wall production water supply pipe and a sprinkler hose connected to a reserved water intake on the tunnel wall production water supply pipe. The sprinkler hose and the tunnel wall production water supply pipe ball valve are threadedly connected for easy assembly and disassembly, and a switch is provided at the water outlet of the sprinkler hose. The high-pressure water flushing device for removing dust from the tunnel walls of the ore unloading station is used to manually flush the tunnel walls with high-pressure water in the direction of the ore unloading train's travel, thereby removing dust from the tunnel walls of the ore unloading station and preventing dust from entering the ventilation system during mine tunnel ventilation.

[0012] The unloading station tunnel bottom plate spraying and moisturizing device is arranged on the air inlet side of the tunnel. The unloading station tunnel bottom plate spraying and moisturizing device is composed of a spray pipe and a plurality of spray holes. The spray pipe is arranged in the middle of the unloading station tunnel top plate. The spray pipe has spray holes spaced apart along the length of the tunnel. The directions of the holes are alternately arranged in three directions: obliquely to the lower left, vertically downward, and obliquely to the lower right, with a hole diameter of 1 to 3 mm.

[0013] The two-way high-pressure spray dust suppression device on the bottom plate of the mine car at the unloading station is composed of a wall high-pressure nozzle, a cross-section high-pressure nozzle, a high-pressure hose, a high-pressure water pump, a water filter, and a filtering automatic control water tank; the high-pressure hose is arranged at the position where the sprinkler pipe is installed on the lower part of the support rollers of the mine cars on both sides, and the high-pressure hose is installed along the support rollers to the end of the unloading station; the wall high-pressure nozzles are installed at intervals on the high-pressure hose; the high-pressure water pump, water filter, and filtering automatic control water tank are arranged on one side of the unloading station tunnel, the high-pressure water pump is connected to the high-pressure hose, and the water filter is installed between the high-pressure water pump and the filtering automatic control water tank to perform secondary filtration on the spray water source to prevent clogging of the high-pressure nozzle; the cross-section high-pressure nozzle is installed at both ends of the unloading station, and the cross-section high-pressure nozzle forms a dust-catching water curtain at both ends of the unloading station to prevent dust that is not captured by the spray system above the unloading pit from continuing to escape into the transportation tunnel during unloading; the cross-section high-pressure nozzle is also connected to the high-pressure hose.

[0014] Furthermore, the spacing between adjacent wall high-pressure nozzles is 1.5 to 2.5 m; the spacing between adjacent section high-pressure nozzles is 450 to 650 mm.

[0015] Furthermore, the wall-surface high-pressure nozzles installed at the lower part of the supporting rollers of the mine cars on both sides are staggered, and the spray angle of the wall-surface high-pressure nozzles is greater than 100 degrees.

[0016] Furthermore, the cross-section high-pressure nozzle is arranged to spray in a direction facing the dust and obliquely downward.

[0017] Furthermore, the spray pipe of the unloading station tunnel floor spraying and moisturizing device is made of polyethylene pipe, the nominal outer diameter of the pipe is 23 to 27 mm, and the pressure rating is 20 to 23 kg; the spray pipe is installed with a tee and a valve at the place where it is connected to the main pipeline to ensure that the spraying water intake does not affect the tunnel flushing water intake.

[0018] As a preferred embodiment of the present invention, in the water spraying and moisturizing device for the bottom plate of the unloading station tunnel, the angle between the opening direction of the spray holes obliquely to the lower left and obliquely to the lower right and the vertical direction is between 30° and 45°, thereby ensuring that the water spray fully covers the bottom plate of the tunnel without affecting electrical equipment such as cables and wires, electric control boxes, signal boxes, etc. on the tunnel wall.

[0019] As a preferred embodiment of the present invention, in the water spraying and moisturizing device for the bottom plate of the unloading station tunnel, the spray pipe is provided with a spray hole every 0.7 to 1.1 m along the length direction of the tunnel, preferably at an interval of 1 m.

[0020] The present invention provides a method for using a combined dust suppression system for a metal mine unloading station using the following technical solutions:

[0021] 1) Use high-pressure water washing equipment to manually wash the roadway along the direction of the unloading train, and wash the roadway in the order of roof, side wall and floor. The frequency of manual washing is 1-2 times per week.

[0022] 2) The tunnel floor spraying and moisturizing device of the unloading station is used to spray and moisturize the tunnel; an infrared sensor is provided on the tunnel roof at the entrance of the unloading station, and an intelligent switch is provided on the tunnel floor spraying and moisturizing device. Every time the unloading train passes under the tunnel roof at the entrance of the unloading station, the infrared sensor is sensed, the intelligent switch is turned on, and pressurized water is sprayed out through the spray holes on the wall of the spray pipe, forming mist-like water droplets to spray the tunnel; when the unloading train exits the entrance of the unloading station, the intelligent switch is turned off;

[0023] 3) A two-way high-pressure spray dust suppression device on the bottom plate of the mine car at the unloading station is used to seal the dust generated during the unloading of ore at the unloading station; the two-way high-pressure spray dust suppression device on the bottom plate of the mine car at the unloading station is controlled by a trigger switch connected to a time relay. The trigger switch is installed on the overhead wire in the middle of the unloading station. When the locomotive of the traction mine car runs to the middle of the unloading station, the overhead wire bow triggers the switch, and the switch transmits a signal to the relay. The relay controls the operation of the high-pressure water pump, and the wall high-pressure nozzles and the cross-section high-pressure nozzles start spraying, forming a spray water curtain closed on all sides.

[0024] The present invention discloses a combined dust suppression system and method for use at a metal mine unloading station, utilizing the aforementioned high-efficiency, energy-saving dust removal and purification methods, including high-pressure water flushing of the unloading station's tunnel walls, water spraying and moisturizing of the unloading station's tunnel floors, and a two-way high-pressure spray dust suppression system for the unloading station's mine car floors. This system achieves significant dust purification results at the unloading station. Furthermore, the two-way high-pressure spray dust suppression system for the mine car floors utilizes automated control. The system automatically closes the filtered, automatically controlled water tank inlet valve when the water level is high, and automatically shuts off the high-pressure pump when the water level is low, preventing malfunctions caused by the high-pressure pump operating without water. The automated spray control system reduces the system's water consumption, enabling on-demand spray dust removal and significantly reducing the energy consumption of the spray dust removal system.

[0025] The combined dust suppression system and method for use at a metal mine unloading station of the present invention adopt the above technical solution, and have the following beneficial effects:

[0026] (1) The water curtain formed by the wall high-pressure nozzle and the cross-section high-pressure nozzle greatly reduces the outward diffusion of dust, improves the dust removal efficiency, and has a significant comprehensive dust suppression and dust control effect, as well as a significant energy-saving effect.

[0027] (2) The two-way high-pressure spray dust suppression system on the bottom plate of the mine car at the unloading station has a high dust suppression efficiency for respirable dust, strong wind resistance and good atomization effect. It can form a dense two-way water mist in the unloading station to cover the entire unloading pit, thereby suppressing the escape of dust generated by the induced wind flow.

[0028] (3) A water filter is installed to filter the spray water source to prevent clogging of the high-pressure nozzle and ensure the effective and normal operation of the comprehensive dust suppression device.

[0029] (4) There is no need to lay special pipes for flushing the tunnel wall. Water can be directly taken from the water intake reserved for the production water supply pipe on the tunnel wall to flush the tunnel. This has low investment and is easy to modify and use.

[0030] (5) The use of a water spraying and moisturizing device on the bottom plate of the unloading station tunnel can ensure that the bottom plate of the tunnel is moist, reduce dust during the movement of vehicles, reduce the dust concentration in the incoming air source, and ensure that the air quality entering the unloading station meets the standards.

[0031] (6) The bidirectional high-pressure spray dust suppression system on the bottom plate of the mine car at the unloading station is controlled by a trigger switch connected to a time relay. The time relay can set the operating time of the high-pressure pump and the operating time of the spray system according to the unloading time of the mine car in the mine. The automated control of the spray system can reduce water consumption and effectively prevent excessive water in the unloading pit from sticking and clogging, thereby improving the on-site applicability of the high-pressure spray dust suppression measure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of the planar layout of a two-way high-pressure spray dust suppression device for a mine car bottom plate at a mine unloading station designed by the present invention;

[0033] FIG2 is a schematic elevational view of the bidirectional high-pressure spray dust suppression device for the bottom plate of a mine car at an unloading station designed by the present invention.

[0034] FIG3 is a schematic diagram of the vertical layout of the spraying and watering moisturizing facade of the mine unloading station tunnel floor designed by the present invention.

[0035] The figures are marked as follows: 1.1-wall high-pressure nozzle; 1.2-section high-pressure nozzle; 2-high-pressure hose; 3-high-pressure water pump; 4-water filter; 5-filter-type automatic control water tank; 6-support roller; 7-unloading station track; 8-unloading pit; 9-unloading station tunnel roof; 10-spray pipe; 11-spray hole. DETAILED DESCRIPTION

[0036] In order to further describe the present invention, a combined dust suppression system for a metal mine unloading station and a method of use of the present invention will be described in more detail below with reference to the accompanying drawings.

[0037] The high-pressure water flushing device for removing dust from the tunnel walls of a mine unloading station designed by the present invention comprises a water supply pipe for production water on the tunnel wall, a sprinkler hose connected to a water intake reserved for the water supply pipe for production water on the tunnel wall, the sprinkler hose and the ball valve of the water supply pipe for production water on the tunnel wall adopt a threaded connection method that is convenient for assembly and disassembly, and a switch is provided at the water outlet of the sprinkler hose. Flushing dust from the tunnel walls of a mine unloading station refers to the manual flushing of the tunnel walls with high-pressure water along the forward direction of the ore unloading train, in the order of the tunnel roof, side walls, and floor, with a manual flushing frequency of 1-2 times per week. There is no need to lay a separate dedicated pipeline for flushing the tunnel walls; water can be directly taken from the water intake reserved for the water supply pipe for production water on the tunnel wall. The mine unloading station is equipped with a sprinkler hose to facilitate flushing dust from the tunnel walls. The sprinkler hose and the ball valve of the water supply pipe adopt a threaded connection method that is convenient for assembly and disassembly, and a switch is provided at the water outlet of the hose to facilitate on-off control during on-site flushing.

[0038] As shown in the schematic plan layout diagram of the two-way high-pressure spray dust suppression device for the bottom plate of the mine car of the unloading station designed by the present invention shown in FIG1 and combined with FIG2, it can be seen that the mine car of the unloading station is located on the unloading station track 7 above the unloading pit 8. The two-way high-pressure spray dust suppression device for the bottom plate of the mine car of the unloading station designed by the present invention is composed of a wall high-pressure nozzle 1.1, a cross-section high-pressure nozzle 1.2, a high-pressure hose 2, a high-pressure water pump 3, a water filter 4, and a filtering automatic control water tank 5; the high-pressure hose 2 is arranged at the position where the sprinkler pipe is installed at the lower part of the mine car support rollers 6 on both sides, and the high-pressure hose 2 is installed along the support rollers 6 to the end of the unloading station, and the wall high-pressure nozzles 1.1 installed at the lower part of the mine car support rollers 6 on both sides are staggered. The effective spray range of the wall high-pressure nozzle 1.1 is greater than 5m and the spray angle is greater than 100 degrees. This design has a good atomization effect, and the fine water mist can fill the entire unloading pit 8; the wall high-pressure nozzle 1.1 The high-pressure hose 2 is installed at intervals of 2 meters. The high-pressure water pump 3, water filter 4, and filtered automatic control water tank 5 are located on one side of the unloading station tunnel, with the water filter 4 installed between the high-pressure water pump 3 and the filtered automatic control water tank 5. The high-pressure water pump 3 is connected to the high-pressure hose 2. The cross-section high-pressure nozzles 1.2 are installed at both ends of the unloading station, with the spacing between adjacent cross-section high-pressure nozzles 1.2 being 500-600 mm, and the spray direction facing the dust and diagonally downward. The cross-section high-pressure nozzles 1.2 are also connected to the high-pressure hose 2, forming a dust-catching water curtain at the two short ends of the unloading station, preventing dust that is not captured by the spray system above the unloading pit 8 from continuing to escape into the transportation tunnel during unloading. The present invention utilizes the high-pressure water pump 3 to provide an appropriate spray pressure, which is connected to the wall high-pressure nozzles 1.1 and the cross-section high-pressure nozzles 1.2 to spray fine water mist particles to efficiently capture dust from the unloading pit.

[0039] As can be seen from the schematic diagram of the vertical layout of the spraying and watering moisturizing of the bottom plate of the unloading station tunnel designed by the present invention shown in Figure 3, the designed spraying and watering moisturizing device of the bottom plate of the unloading station tunnel is arranged on the air inlet side of the tunnel, and the spraying and watering moisturizing device of the bottom plate of the unloading station tunnel is composed of a spray pipe 10 and a plurality of spray holes 11; the spray pipe 10 is arranged in the middle of the top plate 9 of the unloading station tunnel, and the spray pipe 10 has a spray hole 11 every 1m along the length direction of the tunnel, and the directions of the openings are arranged alternately in three directions: obliquely to the lower left, vertically downward and obliquely to the lower right, with an aperture of 1 to 3mm; the angle between the opening direction of the spray hole 11 obliquely to the lower left and obliquely to the lower right and the vertical direction is between 30° and 45°; the spray pipe 10 is made of polyethylene pipe, the nominal outer diameter of the pipe is 25mm, and the pressure rating is 20 to 23 kg; the spray pipe 10 is installed with a tee and a valve at the place where it is connected to the main pipeline to ensure that the spraying and watering does not affect the tunnel flushing water intake. The spray holes 11 opened on the wall of the spray pipe 10 are used to spray pressurized water through the pipe wall to form mist droplets to spray the tunnel, thereby ensuring that the tunnel floor is moistened and reducing dust generation during vehicle travel.

[0040] In conjunction with Figures 1, 2, and 3, the present invention provides a method for using a combined dust suppression system for a metal mine unloading station, which is implemented using the following technical solutions:

[0041] 1) Use high-pressure water washing equipment to manually wash the roadway along the direction of the unloading train, and wash the roadway in the order of roof, side wall and floor. The frequency of manual washing is 1-2 times per week.

[0042] 2) The tunnel floor spraying and moisturizing device of the unloading station is used to spray and moisturize the tunnel; an infrared sensor is provided on the tunnel roof 9 at the entrance of the unloading station, and an intelligent switch is provided on the tunnel floor spraying and moisturizing device of the unloading station. Each time the unloading train passes under the tunnel roof 9 at the entrance of the unloading station, the infrared sensor is sensed, the intelligent switch is turned on, and pressurized water is sprayed out through the spray holes 11 on the wall of the spray pipe 10, forming mist-like water droplets to spray the tunnel; when the unloading train exits the entrance of the unloading station, the intelligent switch is turned off;

[0043] 3) A two-way high-pressure spray dust suppression device is used on the floor of the mine car at the unloading station to seal the dust generated during ore unloading at the unloading station. The two-way high-pressure spray dust suppression device is controlled by a trigger switch connected to a time relay. The trigger switch is installed on the overhead wire in the middle of the unloading station. When the locomotive of the traction mine car runs to the middle of the unloading station, the overhead wire bow triggers the switch, which transmits a signal to the relay. The relay controls the operation of the high-pressure water pump 3, and the wall high-pressure nozzle 1.1 and the cross-section high-pressure nozzle 1.2 start spraying, forming a spray water curtain enclosed on all sides.

[0044] The bidirectional high-pressure spray dust suppression system designed in this invention utilizes automated start and stop control for the mine car floor at the unloading station. By installing a through-beam infrared sensor on the entrance side of the unloading station, an infrared beam is formed between the projector and the receiver. When this infrared beam is interrupted by a passing mine car, the infrared sensor outputs a signal to the main control box, activating the high-pressure spray system. Automated control of the high-pressure spray dust suppression system reduces water consumption and effectively prevents excessive water buildup and clogging in the unloading pit, thereby improving the field applicability of the high-pressure spray dust suppression system and enabling on-demand spray dust removal.

[0045] The present invention's combined dust suppression system for metal ore unloading stations has been industrially tested at a certain underground mine. Prior to implementation, the unloading pit 8 and the tunnels within it generated dust that diffused and drifted during ore unloading and underground ore transportation, causing severe dust pollution and severely impacting the working environment. The implementation of this system has completely resolved the dust pollution issues at the unloading station and airflow contamination within the tunnels, earning widespread praise from underground workers and engineering technicians.

Claims

1. A combined dust suppression system for a metal mine unloading station, characterized in that It is composed of a high-pressure water washing device for the dust on the wall of the mine unloading station tunnel, a water spraying and moisturizing device for the bottom plate of the mine unloading station tunnel, and a two-way high-pressure spray dust suppression device for the bottom plate of the mine car at the mine unloading station. The high-pressure water washing device for removing dust from the tunnel wall of the ore unloading station includes a tunnel wall production water supply pipe, a sprinkler hose connected to a water intake reserved for the tunnel wall production water supply pipe, the sprinkler hose and the tunnel wall production water supply pipe ball valve adopt a threaded connection method that is convenient for disassembly and assembly, and a switch is provided at the water outlet of the sprinkler hose; The ore unloading station tunnel floor spraying and watering moisturizing device is arranged on the air inlet side of the tunnel, and the ore unloading station tunnel floor spraying and watering moisturizing device is composed of a spray pipe (10) and a plurality of spray holes (11). The spray pipe (10) is arranged in the middle of the ore unloading station tunnel roof (9). The spray pipe (10) is provided with spray holes (11) at intervals along the tunnel length direction. The directions of the holes are alternately arranged in three directions: obliquely to the lower left, vertically downward, and obliquely to the lower right, and the hole diameter is 1 to 3 mm. The two-way high-pressure spray dust suppression device for the bottom plate of the mine car of the unloading station is composed of a wall high-pressure nozzle (1.1), a cross-section high-pressure nozzle (1.2), a high-pressure hose (2), a high-pressure water pump (3), a water quality filter (4), and a filtering automatic control water tank (5); the high-pressure hose (2) is arranged at the position where the sprinkler pipe is installed at the lower part of the mine car support roller (6) on both sides, and the high-pressure hose (2) is installed along the support roller (6) to the end of the unloading station; the wall high-pressure nozzle (1.1) is installed on the high-pressure hose (2) at intervals; the high-pressure water pump (3), the water quality filter (4), and the filtering automatic control water tank (5) are arranged on one side of the unloading station lane, the water quality filter (4) is installed between the high-pressure water pump (3) and the filtering automatic control water tank (5), and the high-pressure water pump (3) is connected to the high-pressure hose (2); the cross-section high-pressure nozzle (1.2) is installed at both ends of the unloading station, and the cross-section high-pressure nozzle (1.2) is also connected to the high-pressure hose (2).

2. The combined dust suppression system for a metal mine unloading station according to claim 1, characterized in that: The spacing between adjacent wall high-pressure nozzles (1.1) is 1.5 to 2.5 m; and the spacing between adjacent section high-pressure nozzles (1.2) is 450 to 650 mm.

3. A combined dust reduction system for a metal mine unloading station as described in claim 1, characterized in that the wall high-pressure nozzles (1.1) installed at the lower part of the mine car support rollers (6) on both sides are staggered, and the spray angle of the wall high-pressure nozzles (1.1) is greater than 100 degrees.

4. The combined dust suppression system for a metal mine unloading station according to claim 1, characterized in that: The cross-section high-pressure nozzle (1.2) is set so that the spray direction faces the dust and is obliquely downward.

5. The combined dust suppression system for a metal mine unloading station according to claim 1, characterized in that: The spray pipe (10) of the unloading station tunnel floor spraying and moisturizing device is made of polyethylene pipe, with a nominal outer diameter of 23 to 27 mm and a pressure resistance level of 20 to 23 kg; the spray pipe (10) is installed with a tee and a valve at the place where it is connected to the main pipeline.

6. The combined dust suppression system for a metal mine unloading station according to claim 1, characterized in that: In the water spraying and moisturizing device for the bottom plate of the mine unloading station tunnel, the angle between the opening direction of the spray hole (11) obliquely to the lower left and obliquely to the lower right and the vertical direction is between 30° and 45°.

7. The combined dust suppression system for a metal mine unloading station according to claim 1, characterized in that: In the tunnel floor spraying and moisturizing device of the ore unloading station, the spray pipe (10) is provided with a spray hole (11) at intervals of 0.7 to 1.1 m along the length direction of the tunnel.

8. A method for using a combined dust suppression system for a metal mine unloading station according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that The following technical solutions are implemented: 1) Use high-pressure water washing equipment to manually wash the roadway along the direction of the unloading train, and wash the roadway in the order of roof, side wall and floor. The frequency of manual washing is 1-2 times per week. 2) The tunnel floor spraying and watering device of the unloading station is used to spray and water the tunnel; an infrared sensor is provided on the tunnel roof (9) at the entrance of the unloading station, and an intelligent switch is provided on the tunnel floor spraying and watering device. When the unloading train passes below the tunnel roof (9) at the entrance of the unloading station, the infrared sensor generates a sense, the intelligent switch is turned on, and pressurized water is sprayed out through the spray holes (11) on the wall of the spray pipe (10), forming mist-like water droplets to spray the tunnel; when the unloading train exits and leaves the entrance of the unloading station, the intelligent switch is turned off; 3) Use the two-way high-pressure spray dust suppression device on the bottom plate of the mine car at the unloading station to suppress the dust generated when unloading the ore. The dust is sealed; the two-way high-pressure spray dust suppression device for the bottom plate of the mine car at the unloading station adopts a trigger switch connected to a time relay for control, and the trigger switch is installed on the overhead wire in the middle of the unloading station. When the motor head of the traction mine car runs to the middle of the unloading station, the overhead wire bow triggers the switch, and the switch transmits the signal to the relay. The relay controls the operation of the high-pressure water pump (3), and the wall high-pressure nozzle (1.1) and the cross-section high-pressure nozzle (1.2) start spraying, forming a spray water curtain closed on all sides.

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