A backpack type coal mine underground residual coal recovery equipment

Abstract

The present application relates to the technical field of coal mine cleaning equipment, and discloses a backpack type underground coal mine residual coal recovery equipment, which comprises a backpack frame, a separation cylinder installed on the backpack frame, wherein the separation cylinder comprises an upper separation cylinder and a lower separation cylinder, a connecting cylinder connected between the upper separation cylinder and the lower separation cylinder, an assembly box arranged at the top of the upper separation cylinder, an air inlet side hole formed in the lateral wall of the connecting cylinder in a lateral penetrating mode, a filter screen horizontally arranged in the interior of the assembly box, a conical cylinder installed in the interior of the lower separation cylinder, and an explosion-proof motor installed in the assembly box. By adopting a single driving shaft to synchronously drive the bottom drainage strip and the top brush plate, cooperating with the conical cylinder and the upper and lower independent discharge ports, the technical defects that the large block coal is easy to break through the filter screen and the fine powder is easy to quickly block the filter screen in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of coal mine cleaning equipment technology, specifically a backpack-type underground coal residue recovery device. Background Technology

[0002] After underground mining and transportation operations, a large amount of residual coal is usually scattered in areas such as the roadway floor and both sides of the conveyor belt. The particle size distribution of the residual coal on site varies widely, often containing both large lumps of coal and micron-sized fine coal dust. Due to the narrow space in underground roadways, workers need to frequently move through the site. If the residual coal is not collected in time, it will not only waste coal resources but also easily lead to coal dust accumulation, increasing the safety hazard of underground dust explosions. Therefore, it is necessary to use compact and easily movable equipment to clean up the residual coal on site.

[0003] Existing backpack-style or small-scale cleaning equipment has significant shortcomings in its internal structural design when dealing with mixed coal residues with large particle sizes underground. Firstly, in terms of gas-solid separation, existing equipment typically uses only a single filter for physical interception. Large pieces of coal drawn in with the high-speed airflow easily impact and damage the filter structure, while high concentrations of fine coal dust quickly adhere to and clog the mesh. This leads to a rapid loss of internal negative pressure, requiring frequent shutdowns to disassemble and clean the filter, failing to meet the demands of high-intensity continuous underground operations. Furthermore, existing equipment lacks a grading and collection structure for coarse and fine materials, causing the drawn-in mixture to accumulate, increasing the difficulty of subsequent processing.

[0004] Furthermore, existing equipment has safety hazards in its airflow path and electrical protection design. Some equipment places the exhaust mechanism directly in the dust-laden airflow channel, allowing unfiltered dust-laden air to flow directly through the fan impeller. This not only exacerbates the physical wear of the blades, but the adhering dust also disrupts the dynamic balance of operation, causing severe vibrations. Simultaneously, due to the lack of a reliable isolation and sealing structure inside the cavity, tiny coal dust particles can easily enter the motor cavity through the internal airflow or gaps in the transmission components. In the special environment of underground coal mines, where explosion-proof and anti-static requirements are extremely high, dust intrusion into electrical component areas poses a significant risk of short circuits and deflagration. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a backpack-type underground coal recovery device, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a backpack-type underground coal waste recovery device, comprising: Backpack frame; A separation tube, mounted on the backpack frame, includes an upper separation tube and a lower separation tube; A connecting cylinder is used to connect the upper separating cylinder and the lower separating cylinder; An assembly box is located on top of the upper separation cylinder; An air inlet side hole is provided, extending laterally through the side wall of the connecting cylinder; The filter screen is arranged horizontally inside the assembly box; A conical cylinder is installed inside the lower separation cylinder; An explosion-proof motor is installed inside the assembly box; A drive shaft is connected to the output end of the explosion-proof motor and extends downward through the filter screen into the interior of the conical cylinder; A brush plate is mounted on the drive shaft and is attached to the lower surface of the filter screen. A drainage strip is disposed at the lower end of the drive shaft and located inside the conical cylinder; The device also includes an exhaust assembly for generating a suction negative pressure inside.

[0007] Preferably, the device further includes a cover plate, which covers the top of the assembly box and has vent holes.

[0008] Preferably, the exhaust assembly is a series fan, which is installed inside the assembly box. The explosion-proof motor drives the series fan through the drive shaft to draw the airflow entering through the air inlet upward and discharge it from the exhaust port.

[0009] Preferably, the exhaust assembly is an exhaust fan, which is fixed above the cover plate and sealed and connected to the exhaust port, for drawing internal airflow outward through the exhaust port.

[0010] Preferably, a mounting frame is fixed inside the assembly box, and the equipment also includes multiple battery packs. The explosion-proof motor and the battery packs distributed around the explosion-proof motor are all mounted on the mounting frame. The mounting frame has multiple ventilation holes, which form an airflow channel connecting the upper and lower sides of the assembly box to guide airflow through the battery packs and the explosion-proof motor.

[0011] Preferably, the bottom of the lower separation cylinder is provided with a lower discharge port for discharging coarse particles that fall to the bottom of the lower separation cylinder after being separated by the conical cylinder cyclone, and the side wall of the upper separation cylinder is provided with an upper discharge port for discharging dust that has been cleaned and stripped from the filter screen by the brush plate.

[0012] Preferably, the outer side of the connecting cylinder is provided with an air inlet, which is connected to the air inlet side hole. A frustum-shaped guide cover is also fixed on the drive shaft. The guide cover is located below the filter screen and is used to guide the airflow entering from the air inlet side hole to flow upward. The outer surface of the guide cover is arc-shaped to receive dust falling from the filter screen and guide the dust into the upper separation cylinder.

[0013] Preferably, the device further includes a corrugated hose and a clamp, one end of which is sleeved on the outside of the air intake port and locked in place by the clamp.

[0014] Preferably, the filter screen has a through hole in the center for the drive shaft to pass through, and a shaft sealing ring is embedded in the through hole. The drive shaft passes through the shaft sealing ring and rotates with the shaft sealing ring to prevent dust from leaking from the through hole.

[0015] Preferably, the assembly box has a square box structure, and the inner curved surface of the conical cylinder is flush with the inner side wall of the connecting cylinder and is on the same arc surface.

[0016] This invention provides a backpack-style underground coal recovery device. It has the following advantages: 1. This invention solves the technical defects of existing technologies that use a single filtration method, which leads to large coal pieces easily puncturing the filter screen and fine powder quickly clogging the filter screen. By adopting a single drive shaft to synchronously link the bottom guide bar and the top brush plate, in conjunction with a conical cylinder and independent upper and lower discharge ports, this invention addresses the technical defects of existing technologies that use a single filtration method, resulting in large coal pieces easily puncturing the filter screen and fine powder quickly clogging the filter screen. After the dust-laden airflow enters, the guide bar and the conical cylinder first separate large coal particles through cyclone centrifugal action and discharge them from the lower discharge port, avoiding direct impact of coal particles on the filter screen. At the same time, the brush plate continuously sweeps the bottom surface of the filter screen, removing fine dust and collecting it independently from the upper discharge port. This not only achieves efficient classification and separation of wide-particle-size mixtures, but also gives the filter screen a self-cleaning function, extending the continuous operation time of the equipment.

[0017] 2. This invention uses a horizontally arranged filter screen to divide the cylinder chamber and embeds a shaft sealing ring at the point where the drive shaft passes through. Combined with the arrangement of the exhaust assembly and electrical components on the clean side behind the filter screen, this invention solves the defects of the prior art, such as impeller wear, dynamic imbalance, and the risk of deflagration caused by coal dust intrusion, which are caused by the operation of the fan and motor in a dusty airflow. The double protection of the filter screen and shaft sealing ring ensures that only clean air can enter the upper assembly box, fundamentally eliminating the risk of short circuits and explosions. The clean air drawn upward passes through the ventilation holes of the mounting frame and flows through the battery pack and explosion-proof motor for heat exchange. This achieves efficient cooling of the internal electrical components without the need for an external heat dissipation mechanism, further extending the service life of the equipment.

[0018] 3. This invention solves the problem of bridging and blockage at the diameter change point of the suction pipe for large-diameter lumps of coal by using a corrugated hose with no reduction in diameter, a side air inlet, and a frustum-shaped guide cover fixed on the drive shaft. The equal-diameter pipe ensures unobstructed transport of residual coal throughout the process. The side air inlet provides an initial tangential deflection force for the centrifugal cyclone. In addition, the frustum-shaped guide cover has an additional dual-purpose effect. It can block the high-concentration coal powder airflow from directly impacting the filter screen, and the inclined arc surface of its outer surface can receive the fine dust that falls off the brush plate and smoothly guide the dust into the upper separation cylinder for centralized collection.

[0019] 4. This invention solves the shortcomings of existing coal mine cleaning equipment by highly integrating all separation, power, and energy storage modules onto a backpack frame with shoulder straps, and symmetrically arranging battery packs using mounting brackets. These shortcomings include bulky size, reliance on external power sources or pipelines, and difficulty in flexible operation in narrow tunnels with scattered coal residue. The compact vertical cylinder design, combined with a balanced distribution of the center of gravity, improves the stability and comfort of the operator while carrying the equipment, enabling a single person to independently complete coal residue recovery work in complex underground environments without constraint. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the second ventilation method of the present invention; Figure 3 A schematic diagram illustrating the internal structure of the assembly box of the present invention; Figure 4 This is an exploded view of the internal structure of the assembly box of the present invention; Figure 5 This is a schematic diagram illustrating the installation position of the filter screen in this invention; Figure 6 To highlight the installation position diagram of the conical cylinder of the present invention; Figure 7 To highlight the internal structure of the lower separation cylinder of the present invention; Figure 8 The airflow trend diagram is shown to highlight the usage state of the present invention.

[0021] The components include: 1. Backpack frame; 2. Assembly box; 3. Separation cylinder; 4. Connecting cylinder; 5. Cover plate; 6. Exhaust port; 7. Mounting bracket; 8. Series fan; 9. Battery pack; 10. Explosion-proof motor; 11. Drive shaft; 12. Filter screen; 13. Shaft sealing ring; 14. Brush plate; 15. Air inlet side hole; 16. Air inlet interface; 17. Corrugated hose; 18. Clamp; 19. Conical cylinder; 20. Drainage strip; 21. Lower discharge port; 22. Upper discharge port; 23. Exhaust fan; 24. Guide cover. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See attached document Figure 1 To be continued Figure 4 This invention provides a backpack-type underground coal waste recovery device, including a backpack frame 1, a separating cylinder 3, a connecting cylinder 4, and an assembly box 2. The separating cylinder 3 is installed on the backpack frame 1 and includes an upper separating cylinder and a lower separating cylinder. The connecting cylinder 4 connects the upper separating cylinder and the lower separating cylinder. The assembly box 2 is located on top of the upper separating cylinder and has a square box structure. The backpack frame 1 is equipped with shoulder straps and a waist belt for operators to carry the equipment. The external shell components of the device are made of flame-retardant and anti-static engineering plastics or stainless steel to meet the requirements of the anti-static and explosion-proof working environment in underground coal mines.

[0024] See attached document Figure 5 and attached Figure 8 The side wall of the connecting cylinder 4 is provided with an air inlet side hole 15 through it. The outer side of the connecting cylinder 4 is provided with an air inlet interface 16 that communicates with the air inlet side hole 15. A corrugated hose 17 is sleeved on the outer side of the air inlet interface 16. One end of the corrugated hose 17 is locked and fixed by a clamp 18. The corrugated hose 17 adopts an anti-clogging pipeline with a diameter of 80mm and no cross-sectional shrinkage throughout the process. When a negative pressure is generated inside the equipment, the external dust-laden airflow is drawn in through the corrugated hose 17. The air inlet side hole 15 causes the airflow to enter the equipment laterally, changing the straight-line trajectory of the airflow and providing tangential guidance for the subsequent formation of a centrifugal cyclone.

[0025] See attached document Figure 4 The assembly box 2 has a mounting bracket 7 fixed inside. The explosion-proof motor 10 and multiple battery packs 9 symmetrically distributed around the explosion-proof motor 10 are all mounted on the mounting bracket 7. The rated power of the explosion-proof motor 10 is set to 1.2kW, and the speed adjustment range is 500~3000r / min. The battery packs 9 use 48V lithium-ion batteries. Multiple ventilation holes are opened on the mounting bracket 7. The ventilation holes form an airflow channel connecting the upper and lower sides of the assembly box 2. The clean air drawn upward flows over the surface of the battery packs 9 and the explosion-proof motor 10. The flowing air carries away the heat generated by the electrical components, thereby achieving cooling.

[0026] See attached document Figure 3 and attached Figure 4Inside the upper separation cylinder, a filter screen 12 is horizontally arranged. The filter screen 12 is made of stainless steel wire mesh and fits tightly against the inner wall of the cylinder. A through hole is opened in the center of the filter screen 12 for the drive shaft 11 to pass through. A shaft sealing ring 13 is embedded in the through hole. The shaft sealing ring 13 is a lip seal made of polytetrafluoroethylene. The output end of the explosion-proof motor 10 is connected to the downward-extending drive shaft 11. The drive shaft 11 passes downward through the shaft sealing ring 13 and extends into the conical cylinder 19. The drive shaft 11 and the shaft sealing ring 13 rotate and cooperate to fill the gap between the drive shaft 11 and the through hole of the filter screen 12, preventing coal dust from leaking upward along the shaft gap. The filter screen 12 separates the dust-laden airflow area from the electrical area above, ensuring that coal dust does not enter the cavity where the explosion-proof motor 10 is located.

[0027] This device provides two implementation methods for the exhaust assembly, see attached diagram. Figure 1 and attached Figure 3 In the first embodiment, the equipment also includes a cover plate 5 covering the top of the assembly box 2. The cover plate 5 has an exhaust hole 6. The exhaust assembly is a series fan 8. The series fan 8 is installed inside the assembly box 2. Since the airflow flowing through the series fan 8 is clean air intercepted by the filter screen 12, the impeller of the series fan 8 does not need to be coated with a wear-resistant coating. It is made of aluminum alloy. The explosion-proof motor 10 drives the series fan 8 to run through the drive shaft 11, which draws the airflow entering through the air inlet side hole 15 upward and discharges it from the exhaust hole 6.

[0028] See attached document Figure 2 In the second embodiment, the exhaust assembly is replaced by an exhaust fan 23. The exhaust fan 23 is fixed above the cover plate 5 and is sealed and connected to the exhaust port 6. The exhaust fan 23 draws out the internal airflow through the exhaust port 6. The structure of the external exhaust fan 23 makes it easy to replace the fan module with a different power according to the actual working conditions.

[0029] See attached document Figure 6 To be continued Figure 8 An inverted conical cylinder 19 is installed inside the lower separation cylinder. The inner curved surface of the conical cylinder 19 is flush with the inner side wall of the connecting cylinder 4 and is on the same arc surface, so that the airflow entering the lower separation cylinder smoothly transitions along the inner wall. A guide strip 20 is fixed at the lower end of the drive shaft 11. The guide strip 20 is located inside the conical cylinder 19. When the explosion-proof motor 10 drives the drive shaft 11 to rotate, the guide strip 20 rotates at high speed and agitates the internal airflow. Together with the side-entering airflow, a cyclone separation cyclone is formed in the conical cylinder 19. Coarse coal particles with a particle size greater than 5mm move outward to the inner wall of the conical cylinder 19 under the action of centrifugal force and slide down along the inner wall surface. A lower discharge port 21 is opened at the bottom of the lower separation cylinder. Coarse particles falling into the bottom of the lower separation cylinder enter the bottom collection bin with a volume of about 5 liters through the lower discharge port 21 and are discharged.

[0030] See attached document Figure 5and attached Figure 8 A brush plate 14 and a guide cover 24 are fixed on the drive shaft 11. The guide cover 24 is frustoconical and located below the filter screen 12. The side airflow impacts the outer wall of the guide cover 24. The guide cover 24 physically blocks the airflow and guides the airflow upward to avoid the high-concentration coal powder airflow directly impacting the center of the filter screen 12. Small-diameter coal lumps and fine coal powder rise with the central airflow to the filter screen 12. The filter screen 12 physically intercepts the upward airflow. The drive shaft 11 synchronously drives the brush plate 14 to rotate. The brush plate 14 adheres to the lower surface of the filter screen 12 and sweeps, continuously peeling off the coal powder attached to the mesh.

[0031] See attached document Figure 5 The fine dust removed by the brush plate 14 falls due to gravity. The outer surface of the guide cover 24 is an arc surface that slopes downward. The falling dust is caught on the arc surface of the guide cover 24, flows along the arc surface and slides into the upper separation cylinder. The upper separation cylinder has an upper discharge port 22 on its side wall. The fine dust falling into the upper separation cylinder enters the side collection chamber with a volume of about 3 liters through the upper discharge port 22 and is discharged. The equipment synchronously links the guide strip 20 and the brush plate 14 through a single drive shaft 11 to complete the centrifugal cyclone separation and filter cleaning action, realizing the graded and independent collection of wide particle size mixtures.

[0032] Working principle: When the equipment starts operating, the battery pack 9 supplies power to the explosion-proof motor 10. The explosion-proof motor 10 starts and drives the drive shaft 11 to rotate. At the same time, the ventilation assembly equipped with the equipment (i.e., the internal series fan 8 or the external exhaust fan 23) operates synchronously, generating a suction negative pressure inside the equipment. Refer to the attached document. Figure 8 Under negative pressure, the mixed dust airflow carrying residual coal passes through the corrugated hose 17 and the air inlet 16 in sequence, and enters the interior of the connecting cylinder 4 laterally through the air inlet side hole 15. The lateral air intake method provides the initial tangential motion basis for the airflow. After the airflow enters the connecting cylinder 4, it first comes into contact with the guide cover 24 fixed on the drive shaft 11. The frustum-shaped structure of the guide cover 24 physically blocks the airflow, forcing the airflow to change its straight-line trajectory and preventing high-concentration dust from rushing directly to the filter screen 12 above. Most of the dust-laden airflow enters the conical cylinder 19 downward under the guidance of the pressure difference. At this stage, the drive shaft 11 drives the guide strip 20 at the bottom to rotate at high speed inside the conical cylinder 19. The guide strip 20 agitates the incoming airflow and builds a downward cyclone inside the conical cylinder 19. Under the action of centrifugal force of the cyclone, the large-diameter coarse particles with larger mass in the mixed airflow move outward and hit the inner wall of the cone 19. Since the inner wall curved surface of the cone 19 and the inner side wall of the connecting cylinder 4 are on the same flat arc surface, the coarse particles slide smoothly down the inner wall, break away from the main airflow and fall into the bottom of the lower separation cylinder. The settled coarse particles are finally discharged through the lower discharge port 21, completing the centrifugal separation and collection of coarse particles. After the airflow is separated from the coarse particles, it carries the lighter fine dust and gathers at the center of the conical cylinder 19 and moves upward. When the upward airflow passes through the inside of the upper separation cylinder, the filter screen 12 physically intercepts the fine dust. The dust adheres to the lower surface of the filter screen 12. During this process, the drive shaft 11 drives the brush plate 14 to rotate continuously. The brush plate 14 sweeps against the bottom surface of the filter screen 12, peeling off the fine powder blocking the mesh. The peeled-off fine dust falls onto the outer arc surface of the guide cover 24 and slides down the downward arc surface into the upper separation cylinder, and then is discharged from the upper discharge port 22 on the side wall, realizing the independent collection of fine dust and the continuous self-cleaning of the filter screen 12. The air passing through the filter screen 12 becomes a clean airflow and continues to enter the assembly box 2. During this process, the shaft sealing ring 13 embedded in the through hole rotates and engages with the drive shaft 11 to seal the gap between them and prevent unfiltered coal dust from leaking upwards. The clean air entering the assembly box 2 passes through multiple ventilation holes on the mounting frame 7 and flows over the outer surface of the explosion-proof motor 10 and the battery pack 9, carrying away the heat generated by the electrical components during operation. After completing the cooling and heat exchange, the air is finally discharged into the external environment through the exhaust hole 6 on the cover plate 5 under the continuous suction of the exhaust assembly, completing the entire cycle of residual coal recovery and gas-solid separation.

Claims

1. A backpack-type underground coal waste recovery device, characterized in that, include: Backpack frame (1); A separation tube (3) is installed on the backpack frame (1), the separation tube (3) including an upper separation tube and a lower separation tube; A connecting cylinder (4) is connected between the upper separating cylinder and the lower separating cylinder; Assembly box (2) is located on top of the upper separation cylinder; An air inlet side hole (15) is laterally opened through the side wall of the connecting cylinder (4); A filter screen (12) is arranged laterally inside the assembly box (2); A conical cylinder (19) is installed inside the lower separation cylinder; An explosion-proof motor (10) is installed inside the assembly box (2); A drive shaft (11) is connected to the output end of the explosion-proof motor (10) and extends downward through the filter screen (12) into the interior of the conical cylinder (19); A brush plate (14) is disposed on the drive shaft (11) and is attached to the lower surface of the filter screen (12); A drainage strip (20) is disposed at the lower end of the drive shaft (11) and located inside the conical cylinder (19); The device also includes an exhaust assembly for generating a suction negative pressure inside.

2. The backpack-type underground coal waste recovery equipment according to claim 1, characterized in that, The device also includes a cover plate (5), which covers the top of the assembly box (2) and has an exhaust hole (6) on it.

3. The backpack-type underground coal waste recovery equipment according to claim 2, characterized in that, The exhaust assembly is a series fan (8), which is installed inside the assembly box (2). The explosion-proof motor (10) drives the series fan (8) through the drive shaft (11) to draw the airflow entering through the air inlet side hole (15) upward and discharge it from the exhaust hole (6).

4. A backpack-type underground coal mine waste coal recovery device according to claim 2, characterized in that, The exhaust assembly is an exhaust fan (23), which is fixed above the cover plate (5) and sealed and connected with the exhaust hole (6) for drawing internal airflow outward through the exhaust hole (6).

5. A backpack-type underground coal waste recovery device according to claim 1, characterized in that, The assembly box (2) is fixed with a mounting frame (7). The equipment also includes multiple battery packs (9). The explosion-proof motor (10) and the battery packs (9) distributed around the explosion-proof motor (10) are all mounted on the mounting frame (7). The mounting frame (7) has multiple ventilation holes. The ventilation holes form an airflow channel connecting the upper and lower sides of the assembly box (2) to guide airflow through the battery packs (9) and the explosion-proof motor (10).

6. The backpack-type underground coal waste recovery device according to claim 1, characterized in that, The bottom of the lower separation cylinder is provided with a lower discharge port (21) for discharging coarse particles that fall into the bottom of the lower separation cylinder after being separated by the conical cylinder (19). The side wall of the upper separation cylinder is provided with an upper discharge port (22) for discharging dust that has been cleaned and stripped from the filter screen (12) by the brush plate (14).

7. A backpack-type underground coal mine waste coal recovery device according to claim 1, characterized in that, An air inlet (16) is provided on the outside of the connecting cylinder (4). The air inlet (16) is connected to the air inlet side hole (15). A frustum-shaped guide cover (24) is also fixed on the drive shaft (11). The guide cover (24) is located below the filter screen (12). The guide cover (24) is used to guide the airflow entering from the air inlet side hole (15) to flow upward. The outer surface of the guide cover (24) is arc-shaped, which is used to receive the dust falling from the filter screen (12) and guide the dust to fall into the upper separation cylinder.

8. A backpack-type underground coal mine waste coal recovery device according to claim 7, characterized in that, The device also includes a corrugated hose (17) and a clamp (18), one end of which is sleeved on the outside of the air inlet (16) and locked and fixed by the clamp (18).

9. A backpack-type underground coal waste recovery device according to claim 1, characterized in that, The filter screen (12) has a through hole in the center for the drive shaft (11) to pass through. A shaft sealing ring (13) is embedded in the through hole. The drive shaft (11) passes through the shaft sealing ring (13) and rotates with the shaft sealing ring (13) to prevent dust from leaking from the through hole.

10. A backpack-type underground coal waste recovery device according to claim 1, characterized in that, The assembly box (2) has a square box structure. The inner wall curved surface of the conical cylinder (19) is flush with the inner side wall of the connecting cylinder (4) and is on the same arc surface.

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