Gangue screening device for coal conveying
Through industrial cameras and cameras identifying gangue and using high-pressure air screening, the problem of water source dependence and maintenance difficulty of ray devices in the prior art is solved, and efficient screening of gangue and low-cost gangue screening solutions are realized.
Patent Information
- Application Number
- CN202421037737.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing gangue screening equipment relies on external water sources, resulting in wastewater generation and high operating costs. At the same time, the radiation sorting device has difficulty in maintaining and safety hazards.
A coal-transported gangue screening device is designed to identify the location of gangue using industrial cameras and cameras, and transport high-pressure air through air jet holes to deviate the gangue from the guide plate. It uses its own gravity to screen out gangue, avoiding the dependence of water source and the use of rays.
It realizes efficient screening of gangue, reduces the difficulty and cost of equipment maintenance, and does not generate wastewater, has higher safety, and improves market competitiveness and promotion.
Smart Images
Figure CN222306528U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of gangue screening equipment for coal transportation, in particular to a gangue screening device for coal transportation. Background Art
[0002] my country's coal resources are unevenly distributed, mining conditions are diverse, coal mines in various places are very different, and the technical level and mining equipment are also different. At present, there are three types of longwall mining processes in my country, which are blasting, ordinary mechanization and comprehensive mechanization. In actual use, coal enterprises with better conditions use more comprehensive mechanization, but due to equipment conditions, they still use a combination of blasting and ordinary mechanization to mine coal. The mined coal includes fine coal with smaller particle size and lump coal. In terms of price, the price of lump coal produced in the same mining area is higher than the price of fine coal produced in the corresponding mining area. In the process of coal mining, there is a screening process in the mining area, that is, the fine coal and lump coal are separated and stored separately, that is, lump coal bunker and fine coal bunker. Then they are transported out of the mining area and received by the coal preparation plant. Among them, the gangue content of coal has always been an important criterion for judging whether coal is high quality. After receiving the lump coal, one of the important tasks of the coal preparation plant is to screen the gangue contained in the lump coal. At present, the mechanical gangue separation equipment commonly used in coal preparation plants includes heavy medium separators, moving screen jigs and ray separation and gangue removal equipment.
[0003] The advantages of heavy medium separators are high gangue discharge efficiency, low loss rate of gangue coal, wide range of raw coal particle size, strong adaptability to feed stability and coal quality changes, and reliable equipment operation. The dynamic screen jig has the following advantages: simple equipment structure, easy operation, fewer auxiliary equipment, large processing capacity, low water consumption, small space occupation, simple coal slurry water treatment system, easy to achieve closed water circulation, and low later operating costs. However, the above two types of gangue selection equipment rely on external water sources to achieve gangue screening, which makes it easy to generate wastewater. The relevant wastewater should be treated before discharge in accordance with national requirements. Therefore, when using the above two types of gangue selection equipment to screen gangue, it is also necessary to add supporting subsequent sewage treatment equipment, which adds additional operating costs to the enterprise.
[0004] The traditional gangue removal method is based on the density difference between coal and gangue, while the ray sorting and gangue removal is based on the material properties to identify, calculate and separate the differences in the degree of ray reflection, absorption, scattering, etc., and build different coal quality characteristic models through big data and artificial intelligence, so as to realize the digital identification of coal gangue and finally discharge the gangue through a reliable and highly sensitive execution structure. Commonly used sorting rays include gamma rays and X-rays. The specific process of ray sorting and gangue removal includes transporting the lump coal mixed with gangue from upstream to the conveyor belt, using the identification equipment above the conveyor belt to identify the coal and gangue, and then combining the high-sensitivity actuator at the tail end of the conveyor belt to eject high-pressure airflow to discharge the gangue in the corresponding area. The ray sorting and gangue removal equipment has a high degree of intelligence, and no wastewater is generated during the gangue selection process. It is a more preferred gangue screening device, but because the acquisition of gamma rays can only be obtained by using a radioactive source, and the radioactive source has a half-life, it needs to be calibrated frequently during use to ensure the accuracy of the data. X-rays are obtained by using a high-voltage generator to provide a high-voltage current to the X-ray generator. When working in the corresponding coal preparation plant, the corresponding high-voltage generator and the X-ray generator need to be equipped with corresponding shielding covers to avoid the danger of arcing. The shielding covers are prone to corrosion after being used for a preset time and need to be replaced. However, both X-rays and gamma rays have corresponding dangers during use, and safety should be paid attention to during use. Therefore, the identification device in the ray sorting and gangue can be replaced, and the maintenance difficulty and use danger in the subsequent use process can be reduced, thereby improving the market competitiveness of the gangue sorting equipment after the identification device is replaced, and improving the promotion degree. Summary of the invention
[0005] In view of the deficiencies in the prior art, the utility model provides a gangue screening device for coal transportation, which can identify the position of gangue on a conveyor belt and correspondingly reduces the difficulty of maintaining the identification equipment, so as to overcome the defects in the prior art.
[0006] The technical solution adopted by the utility model is: a gangue screening device for coal transportation, including a conveyor, the conveyor including a first frame, a driving roller is arranged on one end of the first frame, a redirecting roller is arranged on the other end of the first frame, a conveyor belt is arranged on the redirecting roller and the driving roller, a buffer mechanism is arranged on the first frame inside the conveyor belt, the buffer mechanism includes a plurality of buffer strips parallel to each other, a second frame is arranged on the first frame, the second frame is located above the buffer mechanism, an industrial camera is arranged on the second frame, a guide plate is arranged on the first frame on the side of the redirecting roller away from the driving roller, the angle between the guide plate and the horizontal plane is 30 to 60 degrees, and an air jet hole is arranged on the guide plate, the number of the air jet holes is several, and the plurality of air jet holes are uniformly distributed on the guide plate in a straight line along a direction parallel to the central axis of the redirecting roller, and a camera is arranged on the side of the guide plate away from the redirecting roller.
[0007] Preferably, a lighting mechanism is arranged on the outside of the industrial camera, and the lighting mechanism includes a first mounting frame arranged on the second frame, a second mounting frame arranged at the bottom of the first mounting frame, a heat sink arranged on the second mounting frame, and an LED light board arranged at the bottom of the heat sink.
[0008] Preferably, the lighting mechanism further comprises hinge shafts provided on the first mounting frame and the second mounting frame, an arc-shaped limiting groove provided on the second mounting frame above the hinge shaft, and fastening bolts provided on the limiting groove and the first mounting frame.
[0009] Preferably, a camera cover is provided on the outside of the industrial camera, a first driving motor is provided on the second mounting frame on one side of the LED light board and in the camera cover respectively, a rubber strip mounting frame is provided on the output end of the first driving motor, a rubber strip is provided on the rubber strip mounting frame, the lighting end of the LED light board is movably connected to the adjacent rubber strip, and the lens end of the industrial camera is movably connected to the adjacent rubber strip.
[0010] Preferably, it also includes a gas main pipe, on which a first air filter, an air compressor unit, a one-way valve and a gas buffer tank are sequentially arranged along the inlet end of the gas main pipe to the outlet end of the gas main pipe, each jet hole is correspondingly provided with a jet nozzle, and a gas branch pipe is correspondingly arranged between the inlet end of each jet nozzle and the outlet end of the gas main pipe, and a solenoid valve is arranged on the gas branch pipe.
[0011] Preferably, the second frame is provided with a hood, the hood is provided with an inspection door, the hood is provided with an air supply duct and an air outlet duct, the air supply duct is provided with a first gas flow sensor, a first regulating valve, a first fan and a second air filter in sequence along the direction from close to the hood to away from the hood, and the air outlet duct is provided with a second gas flow sensor, a second regulating valve and a second fan in sequence along the direction from close to the hood to away from the hood.
[0012] Preferably, a guide roller is provided on the first frame between the redirecting roller and the driving roller, the guide roller is located below the conveyor belt, the guide roller and the conveyor belt are movably connected, a scraper plate is provided on one side of the guide roller, the scraper plate and the conveyor belt are movably connected, a third mounting frame is provided on the scraper plate, and an elastic force adjustment device is provided on the third mounting frame and the first frame, the elastic force adjustment device includes a sliding rod provided on the end of the third mounting frame, a spring provided on the sliding rod below the third mounting frame, and an adjusting nut provided on the sliding rod below the spring, the adjusting nut and the sliding rod are threadedly connected, the sliding rod and the third mounting frame are movably connected, and the top end of the sliding rod is installed on the first frame.
[0013] The beneficial effects of the utility model are as follows: first, the utility model realizes the identification of lump coal and gangue through the industrial camera, and uses the camera to confirm according to the size and shape of the gangue and transmits high-pressure air to the corresponding jet hole, so as to cause the gangue to deviate from the preset falling position after being guided by the guide plate and then descending by its own gravity, so as to meet the purpose of screening out the gangue from the lump coal. Compared with the identification device made of complex structure of X-ray or gamma ray, the subsequent maintenance is simpler, and compared with the identification device made of complex structure of X-ray or gamma ray, the identification device of this product using industrial camera as core component is lower in price and lower in initial investment of the enterprise. Also, because the identification device made of industrial camera as core component has simpler structure, subsequent maintenance is also simpler. At the same time, there is no need to consider the potential factor that the radiation may cause harm to the staff, and it is easier to succeed commercially.
[0014] Secondly, the gas buffer tank described in the utility model is provided with a pressure sensor; installing the pressure sensor facilitates the feedback of pressure parameters.
[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.
[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.
[0018] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B.
[0019] Figure 4 It is a structural schematic diagram of the utility model.
[0020] Figure 5 for Figure 4A partial enlarged schematic diagram of detail C.
[0021] Figure 6 for Figure 4 A partial enlarged schematic diagram of detail D.
[0022] Figure 7 It is a structural schematic diagram of the components of the utility model.
[0023] Figure 8 It is a structural schematic diagram of the components of the utility model. DETAILED DESCRIPTION
[0024] like Figures 1 to 8 As shown, a gangue screening device for coal transportation includes a conveyor, which includes a first frame 1, a driving roller 2 is arranged on one end of the first frame 1, and the driving roller 2 is transmission-connected to a second driving motor, a redirecting roller 3 is arranged on the other end of the first frame 1, and a conveyor belt 4 is arranged on the redirecting roller 3 and the driving roller 2, and a buffer mechanism is arranged on the first frame 1 inside the conveyor belt 4, and the buffer mechanism includes a plurality of mutually parallel buffer bars 5, and a second frame 6 is arranged on the first frame 1, and a mounting plate 42 is arranged at the bottom of the buffer mechanism, and a plurality of mutually parallel I-beams 43 are arranged between the mounting plate 42 and the first frame 1, each buffer bar 5 extends along the direction from the redirecting roller 3 to the driving roller 2, and the I-beam 43 and the buffer bar 5 are perpendicular to each other, and the first frame 1 above the buffer mechanism is symmetrically provided with two mutually parallel material baffle plates 44, and the number of the buffer mechanisms is a plurality, and the plurality of the buffer mechanisms are sequentially distributed on the first frame 1 along the redirecting roller 3 to the driving roller 2. The second frame 6 is located above the buffer mechanism, and an industrial camera 7 is arranged on the second frame 6. A guide plate 8 is arranged on the first frame 1 on the side of the redirecting roller 3 away from the driving roller 2. The angle between the guide plate 8 and the horizontal plane is 30 to 60 degrees. The guide plate 8 is provided with jet holes 9. The number of the jet holes 9 is several, and the several jet holes 9 are uniformly distributed on the guide plate 8 in a straight line along a direction parallel to the central axis of the redirecting roller 3. A camera 10 is arranged on the side of the guide plate 8 away from the redirecting roller 3.
[0025] The industrial camera 7 is provided with an illumination mechanism on the outside thereof, and the illumination mechanism includes a first mounting frame 11 provided on the second frame 6, a second mounting frame 12 provided at the bottom of the first mounting frame 11, a heat sink 13 provided on the second mounting frame 12, and an LED light board 14 provided at the bottom of the heat sink 13; further, the illumination mechanism is provided in a plurality of pieces, and in order to facilitate the light requirement of the shooting area of the industrial camera 7 to be suitable for shooting, the illumination mechanism also includes a hinge shaft 15 provided on the first mounting frame 11 and the second mounting frame 12, an arc-shaped limiting groove 16 provided on the second mounting frame 12 above the hinge shaft 15, and a fastening bolt 17 provided on the limiting groove 16 and the first mounting frame 11. By sequentially adjusting the deflection angle of each second mounting frame 12 on the first mounting frame 11 and then adjusting the deflection angle of the LED light board 14, the shooting area of the industrial camera 7 is illuminated by using a plurality of the illumination mechanisms, so that the shooting area of the industrial camera 7 meets the light requirement of suitable for capturing images.
[0026] Since the air environment of the coal preparation plant inevitably contains a large amount of dust particles suspended in the air, the industrial camera 7 and the LED light board 14 will inevitably be exposed to air containing dust particles during operation. Dust enriched at the lens end of the industrial camera 7 will cause interference when the industrial camera 7 captures images; similarly, dust enriched at the lighting end of the LED light board 14 will reduce the light emitted by the LED light board 14, thereby reducing the light in the shooting area of the industrial camera 7. Therefore, this product is provided with a camera cover 18 on the outside of the industrial camera 7, and a first drive motor 19 is respectively provided on the second mounting frame 12 on one side of the LED light board 14 and in the camera cover 18, a rubber strip mounting frame 20 is provided on the output end of the first drive motor 19, and a rubber strip 21 is provided on the rubber strip mounting frame 20, the lighting end of the LED light board 14 is movably connected to the adjacent rubber strip 21, and the lens end of the industrial camera 7 is movably connected to the adjacent rubber strip 21. The first drive motor 19 adopts a reduction stepping motor, so that the first drive motor 19 drives the rubber strip mounting frame 20 to swing back and forth, and the rubber strip mounting frame 20 drives the corresponding rubber strip 21 to perform corresponding actions, thereby using the rubber strip 21 to clean the dust particles adhered to the lens end of the industrial camera 7 or the lighting end of the LED light board 14, thereby reducing the interference caused by the dust particles adhered to the lens end of the industrial camera 7 or the LED light board 14 when the industrial camera 7 captures the image.
[0027] For further information, please refer again to Figure 8Since the LED lamp board 14 generates heat when working, the LED lamp board 14 will shorten its service life if it works under a continuous high temperature state. Although the heat sink 13 in the lighting mechanism will receive the heat released by the LED lamp board 14 to assist the LED lamp board 14 in dissipating heat, on this basis, a hood 30 is arranged on the second frame 6 of this product, and an inspection door 31 is arranged on the hood 30. An air supply duct 32 and an air outlet duct 33 are arranged on the hood 30. Several lighting mechanisms are located in the hood 30 between the air supply duct 32 and the air outlet duct 33. The air supply duct 32 is provided with a first gas flow sensor 34, a first regulating valve 35, a first fan 36 and a second air filter 37 in sequence along the direction from close to the hood 30 to away from the hood 30. The air outlet duct 33 is provided with a second gas flow sensor 38, a second regulating valve 39 and a second fan 40 in sequence along the direction from close to the hood 30 to away from the hood 30.
[0028] The air filtered by the second air filter 37 to remove dust particles is driven by the first fan 36 to form an input airflow as a cold source, which is continuously transported to the LED light board 14 and the heat sink 13 in the lighting mechanism. The input airflow exchanges heat with the LED light board 14 and the heat sink 13, thereby reducing the temperature of the LED light board 14 and the heat sink 13. The input airflow after heat exchange enters the air outlet duct 33 to form an exhaust airflow, which is discharged from the outlet end of the air outlet duct 33 to the exhaust gas delivery duct. And the flow rate of the input airflow delivered through the air supply duct 32 and the flow rate of the exhaust airflow delivered through the air outlet duct 33 can be determined according to the parameters fed back by the first gas flow sensor 34 and the parameters fed back by the second gas flow sensor 38, and then the opening of the first regulating valve 35 and the opening of the second regulating valve 39 are adjusted accordingly so that the flow rate of the input airflow is greater than the flow rate of the exhaust airflow, thereby reducing the air containing dust particles in the vicinity of the product from mixing into the input airflow, thereby causing the lighting end of the LED light board 14 and the lens end of the industrial camera 7 to adhere to the dust particles, causing interference when the industrial camera 7 captures images.
[0029] Please refer again Figure 7 The product also includes a gas main pipe 22, on which a first air filter 23, an air compressor unit 24, a one-way valve 41 and a gas buffer tank 25 are sequentially arranged along the direction from the inlet end to the outlet end of the gas main pipe 22, each jet hole 9 is correspondingly provided with a jet nozzle 26, and a gas branch pipe 27 is correspondingly arranged between the inlet end of each jet nozzle 26 and the outlet end of the gas main pipe 22, and a solenoid valve 28 is arranged on the gas branch pipe 27. The gas buffer tank 25 is provided with a pressure sensor 29.
[0030] Although the product receives lump coal mixed with gangue, the gangue and lump coal may also be adhered with dirt or coal powder, and the dirt or coal powder will remain on the conveyor belt 4 as the lump coal or gangue contacts the conveyor belt 4. In order to reduce the dirt or coal powder carried on the conveyor belt 4, the first frame 1 between the redirection roller 3 and the driving roller 2 of the product is provided with a guide roller 45, the guide roller 45 is located below the conveyor belt 4, the guide roller 45 is movably connected to the conveyor belt 4, and a scraper plate 46 is provided on one side of the guide roller 45. The scraper plate 46 It is movably connected to the conveyor belt 4, a third mounting frame 47 is provided on the scraper plate 46, and an elastic force adjusting device is provided on the third mounting frame 47 and the first frame 1, the elastic force adjusting device includes a slide bar 48 provided on the end of the third mounting frame 47, a spring 49 provided on the slide bar 48 below the third mounting frame 47, and an adjusting nut 50 provided on the slide bar 48 below the spring 49, the adjusting nut 50 is threadedly connected to the slide bar 48, the slide bar 48 is movably connected to the third mounting frame 47, and the top end of the slide bar 48 is installed on the first frame 1.
[0031] In the process of the conveyor belt 4 being transported from the redirecting roller 3 to the driving roller 2, after this part of the conveyor belt is guided by the guide roller 45, the compression degree of the spring 49 is adjusted by adjusting the position of the adjusting nut 50 in the elastic force adjustment device on the slide rod 48, so that the scraper plate 46 installed on the third mounting frame 47 is always in contact with the outer side surface of the conveyor belt 4, so that the scraper plate 46 is used to continuously scrape off the dirt or coal powder attached to the outer side surface of the conveyor belt 4, thereby reducing the dirt or coal powder attached to the outer side surface of the conveyor belt 4.
[0032] The use of this product is as follows: Figures 1 to 8As shown, the storage device for storing lump coal upstream conveys the lump coal mixed with gangue to the conveyor belt 4 between the two baffle plates 44 near one side of the driving drum 2 through a conveying device. The falling materials are buffered by the buffer mechanism and continue to move toward the industrial camera 7 along the conveyor belt 4. When the lump coal and gangue are conveyed to the camera area of the industrial camera 7 together, the position of the gangue on the conveyor belt 4 is determined based on the information fed back by the industrial camera 7. Then, as the conveyor belt 4 continues to move, combined with the actual conveying speed of the conveyor belt 4, the gangue and lump coal continue to move forward to one end near the redirecting drum 3. When the driving belt 4 passes the gangue and The lump coal is conveyed to the guide plate 8. When the gangue is guided by the guide plate 8 and falls to the corresponding jet hole 9, the electromagnetic valve 28 on the gas delivery branch pipe 27 corresponding to the corresponding one or more jet holes 9 is opened. At this time, the high-pressure gas source in the gas buffer tank 25 inputs high-pressure air to the gas delivery branch pipe 27, thereby conveying high-pressure air to the corresponding jet hole 9 through the corresponding jet hole 9, thereby using one or more streams of high-pressure air to apply external force to the gangue, thereby causing the gangue to deviate from the preset falling position after being guided by the guide plate 8 and falling by its own gravity, so as to select the gangue from the lump coal. In this process, the camera 10 captures video information and actually observes whether the corresponding jet hole 9 is in a normal working state.
[0033] Through this embodiment, the lump coal and gangue are identified by the industrial camera 7, and the camera 10 is used to confirm the size and shape of the gangue and deliver high-pressure air to the corresponding jet hole 9, so as to cause the gangue to deviate from the preset falling position after being guided by the guide plate 8 and then descending by its own gravity, so as to meet the purpose of screening out the gangue from the lump coal. Compared with the identification device made of complex X-ray or gamma ray structure, the subsequent maintenance is simpler. Compared with the identification device made of complex X-ray or gamma ray structure, the identification device of this product using the industrial camera 7 as the core component is lower in price and lower in initial investment for the enterprise. Also, because the identification device manufactured using the industrial camera 7 as the core component has a simpler structure, subsequent maintenance is also simpler. At the same time, there is no need to consider the potential factor that the radiation may cause harm to the staff, and it is easier to succeed commercially.
[0034] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.
Claims
1. A gangue screening device for coal transportation, characterized in that: The conveyor comprises a first frame (1), a driving roller (2) is arranged at one end of the first frame (1), a redirecting roller (3) is arranged at the other end of the first frame (1), a conveyor belt (4) is arranged on the redirecting roller (3) and the driving roller (2), a buffer mechanism is arranged on the first frame (1) inside the conveyor belt (4), the buffer mechanism comprises a plurality of buffer bars (5) parallel to each other, a second frame (6) is arranged on the first frame (1), the second frame (6) is located above the buffer mechanism, and the second frame (6) An industrial camera (7) is arranged on the first frame (1), a guide plate (8) is arranged on the side of the redirecting roller (3) away from the driving roller (2), the angle between the guide plate (8) and the horizontal plane is 30 to 60 degrees, and an air jet hole (9) is arranged on the guide plate (8). The number of the air jet holes (9) is a plurality, and the plurality of air jet holes (9) are uniformly distributed on the guide plate (8) in a straight line along a direction parallel to the central axis of the redirecting roller (3), and a camera (10) is arranged on the side of the guide plate (8) away from the redirecting roller (3).
2. The gangue screening device for coal transportation according to claim 1, characterized in that: An illumination mechanism is arranged on the outside of the industrial camera (7), and the illumination mechanism comprises a first mounting frame (11) arranged on the second frame (6), a second mounting frame (12) arranged at the bottom of the first mounting frame (11), a heat sink (13) arranged on the second mounting frame (12), and an LED light panel (14) arranged at the bottom of the heat sink (13).
3. The gangue screening device for coal transportation according to claim 2, characterized in that: The lighting mechanism further comprises a hinge shaft (15) provided on the first mounting frame (11) and the second mounting frame (12), an arc-shaped limiting groove (16) provided on the second mounting frame (12) above the hinge shaft (15), and a fastening bolt (17) provided on the limiting groove (16) and the first mounting frame (11).
4. The gangue screening device for coal transportation according to claim 2, characterized in that: The industrial camera (7) is provided with a camera cover (18) on the outside, a first drive motor (19) is provided on the second mounting frame (12) on one side of the LED light board (14) and in the camera cover (18), respectively, a rubber strip mounting frame (20) is provided on the output end of the first drive motor (19), a rubber strip (21) is provided on the rubber strip mounting frame (20), the lighting end of the LED light board (14) is movably connected to the adjacent rubber strip (21), and the lens end of the industrial camera (7) is movably connected to the adjacent rubber strip (21).
5. The gangue screening device for coal transportation according to claim 1, characterized in that: The invention also comprises a gas main pipe (22), on which a first air filter (23), an air compressor unit (24), a one-way valve (41) and a gas buffer tank (25) are arranged in sequence from the inlet end of the gas main pipe (22) to the outlet end of the gas main pipe (22), each gas jet hole (9) is correspondingly provided with a gas nozzle (26), a gas branch pipe (27) is correspondingly provided between the inlet end of each gas nozzle (26) and the outlet end of the gas main pipe (22), and a solenoid valve (28) is provided on the gas branch pipe (27).
6. The gangue screening device for coal transportation according to claim 1, characterized in that: The second frame (6) is provided with a hood (30), the hood (30) is provided with an inspection door (31), the hood (30) is provided with an air supply duct (32) and an air outlet duct (33), the air supply duct (32) is provided with a first gas flow sensor (34), a first regulating valve (35), a first fan (36) and a second air filter (37) in sequence along a direction from close to the hood (30) to far away from the hood (30), and the air outlet duct (33) is provided with a second gas flow sensor (38), a second regulating valve (39) and a second fan (40) in sequence along a direction from close to the hood (30) to far away from the hood (30).
7. The gangue screening device for coal transportation according to claim 1, characterized in that: A guide roller (45) is provided on the first frame (1) between the redirecting roller (3) and the driving roller (2), the guide roller (45) is located below the conveyor belt (4), the guide roller (45) and the conveyor belt (4) are movably connected, a scraper plate (46) is provided on one side of the guide roller (45), the scraper plate (46) and the conveyor belt (4) are movably connected, a third mounting frame (47) is provided on the scraper plate (46), and a third mounting frame (47) and the first frame (1) are provided The elastic force adjustment device comprises a slide bar (48) arranged on the end of the third mounting frame (47), a spring (49) arranged on the slide bar (48) below the third mounting frame (47), and an adjustment nut (50) arranged on the slide bar (48) below the spring (49), the adjustment nut (50) and the slide bar (48) being threadedly connected, the slide bar (48) and the third mounting frame (47) being movably connected, and the top end of the slide bar (48) being mounted on the first frame (1).