A coal mine tunneling working face transport belt passes through air door air leakage prevention device
By installing fixed wind-blocking rollers and pneumatic baffles between the upper and lower conveyor belts of the coal mine tunneling face, combined with a laser velocimeter control system, the problem of air leakage between belts was solved, effectively blocking backflow and gas, and reducing the risk of accident spread.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI UNIV OF ENG
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-19
AI Technical Summary
In existing technologies, there is a risk of air leakage between the upper and lower conveyor belts in coal mine tunneling faces. Especially in the event of a coal and gas outburst, gas may spread through the gaps in the belts, increasing the scope and danger of the accident.
A fixed wind-blocking roller is installed between the upper and lower belts. When the conveyor belt moves, the fixed wind-blocking roller rotates with it. Combined with the pneumatic baffle of the upper belt and the laser speed measuring instrument control system, it can effectively block the gap between the upper and lower belts and prevent backflow of sewage air and gas.
It effectively blocks backflow of polluted air and gas between the upper and lower belts, reduces the risk of fire on the belt, and enables automatic monitoring and control of belt operation status to ensure that airflow does not flow backward and prevent the spread of accidents.
Smart Images
Figure CN224379895U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of ventilation doors for coal mine conveyor belts, specifically to a leak-proof device for ventilation doors on conveyor belts in coal mine tunneling faces. Background Technology
[0002] Coal mine underground tunneling faces typically employ forced ventilation, where fresh air is delivered from the intake airway to the tunneling face via ventilation ducts, while contaminated air from the tunneling face enters a dedicated return airway. However, due to gaps in the conveyor belts within the tunneling roadways, contaminated air from the tunneling face may leak along the conveyor belts in the return airway, causing recirculated air at the tunneling face. Furthermore, in the event of a coal and gas outburst at the tunneling face, a portion of the outburst's gas flow can migrate through the gaps between the conveyor belts into the intake airway, further expanding the impact and hazard of the coal and gas outburst. Therefore, a leakage prevention device for conveyor belts in coal mine tunneling faces has been designed, such as the Chinese utility model patent CN210686039U, entitled "Leakage Prevention Device for Mine Belt Conveyor Air Doors." However, this solution focuses on leakage prevention above and below the belt, neglecting the leakage prevention design between the upper and lower belts, which still carries the risk of contaminated air backflow. Therefore, a device capable of preventing leakage between the upper and lower belts is needed. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a leak-proof device for the ventilation door of the conveyor belt in a coal mine tunneling face. By setting a fixed wind-blocking roller between the upper and lower belts, the fixed wind-blocking roller rotates with the conveyor belt when it moves, without affecting the normal operation of the conveyor belt, and can completely block the backflow of dirty air between the upper and lower belts.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a windproof device for a conveyor belt ventilation door in a coal mine tunneling face, comprising a conveyor belt located within the windbreak wall conveyor belt arrangement surface, an upper windbreak structure located above the conveyor belt, a lower windbreak structure located below the conveyor belt, and a fixed wind-blocking roller located within the conveyor belt that can rotate with its operation.
[0005] The conveyor belt consists of an integrally connected upper belt and a lower belt;
[0006] A fixed wind-blocking roller is installed between the upper and lower belts.
[0007] Furthermore, it also includes a conveyor belt support arranged around the conveyor belt; the conveyor belt support includes uprights located on the left and right sides of the conveyor belt, and crossbars connected to the top of the uprights; a central rotating shaft is provided in the middle of the fixed wind-blocking roller, and the two ends of the central rotating shaft are connected to the uprights.
[0008] Furthermore, the upper windbreak structure includes an upper belt pneumatic baffle; the top of the upper belt pneumatic baffle is provided with a hinge, and the upper belt pneumatic baffle is rotatably connected to the windbreak wall belt arrangement surface through the hinge; the upper belt pneumatic baffle is provided with a buckle, and a cylinder is movably connected to the windbreak wall belt arrangement surface or the transport belt bracket, and the movable end of the cylinder is movably connected to the buckle.
[0009] Furthermore, the bottom of the upper belt pneumatic baffle is integrally provided with a protrusion; when the upper belt pneumatic baffle is in a vertical state, the bottom of the protrusion contacts the upper surface of the upper belt.
[0010] Furthermore, an upper belt idler is provided below the upper belt, and a lower belt idler is provided below the lower belt; the idlers are cylindrical in shape.
[0011] Furthermore, the fixed wind-blocking roller has a cylindrical hollow structure and is located between the lower belt and the upper belt idler. The bottom of the fixed wind-blocking roller is in contact with the lower belt and there is a gap between the top and the upper belt idler, or there is a gap between the bottom and the lower belt and the top is in contact with the upper belt idler.
[0012] Furthermore, the lower windbreak structure includes a lower belt fixing baffle fixedly installed directly below the lower belt idler; the lower belt fixing baffle is fixedly connected to the windbreak wall belt arrangement surface or the transport belt bracket.
[0013] Furthermore, a laser velocimeter and a controller are installed on the upper belt pneumatic baffle, with the controller connected to the laser velocimeter and the cylinder respectively.
[0014] The beneficial effects of this utility model are as follows: 1. By setting a fixed air-blocking roller between the upper and lower conveyor belts, the top of the fixed air-blocking roller contacts the bottom of the upper conveyor belt idler, and the bottom of the fixed air-blocking roller contacts the upper surface of the lower conveyor belt. When the conveyor belt moves, the fixed air-blocking roller rotates with it, without affecting the operation of the conveyor belt, and can completely block the backflow of polluted air between the upper and lower conveyor belts; effectively blocking the large gap between the upper and lower conveyor belts, preventing the return airflow from the tunneling face from flowing back through the gaps in the conveyor belt, and also effectively preventing the backflow of large amounts of gas caused by coal and gas outbursts. The fixed air-blocking roller can roll with the belt movement, preventing excess heat from the belt due to non-rolling contact, and reducing the possibility of belt fire. The fixed air-blocking roller prevents air leakage from the tunneling face through the fixed air-blocking roller, and also prevents the backflow of airflow and flue gas in the tunneling roadway in the event of a disaster.
[0015] 2. This utility model will effectively solve the problem of air leakage in the conveyor belt in the coal mine tunneling face. The designed upper belt pneumatic baffle can effectively seal the space above the conveyor belt and effectively block the space on one side of the upper belt, preventing the return air flow and catastrophic gas from leaking out of the space, thus effectively solving the air leakage problem on the upper side of the upper belt.
[0016] 3. This utility model monitors the belt speed using a laser velocimeter and sends different commands to the cylinder via a controller. When the laser velocimeter detects zero belt speed and the conveyor belt is stopped, the speed signal is transmitted to the controller, which then sends an extension command to the cylinder. The cylinder drives the upper belt pneumatic baffle to move perpendicular to the upper belt, with the protruding part of the baffle engaging with the groove of the upper belt, achieving full engagement between the upper belt pneumatic baffle and the upper belt. When the laser velocimeter detects the belt at a normal operating speed, the speed signal is transmitted to the controller, which then sends a retraction command to the cylinder. The cylinder then retracts the upper belt pneumatic baffle, bringing it parallel to the upper belt. This achieves automatic monitoring of belt operation and adjustment of the upper belt pneumatic baffle's opening state, providing effective control over airflow reversal at the ventilation doors in tunneling faces and preventing reverse gas outbursts in coal and gas outburst accidents. Attached Figure Description
[0017] Figure 1 A schematic diagram of the ventilation door and conveyor belt structure in the tunnel excavation roadway;
[0018] Figure 2 This is a schematic diagram of the conveyor belt in normal operating condition.
[0019] Figure 3 This is a schematic diagram of the conveyor belt in a stopped state.
[0020] Figure 4 This is a schematic diagram of the upper belt pneumatic baffle structure.
[0021] In the diagram: 1. Excavation roadway; 2. Excavation roadway ventilation door; 3. Ventilation door pressure relief window; 4. Ventilation duct; 5. Conveyor belt; 6. Belt arrangement of windbreak wall; 7. Upper belt pneumatic baffle; 8. Fixed wind-blocking roller; 9. Lower belt fixed baffle; 10. Conveyor belt bracket; 11. Laser velocimeter; 12. Cylinder; 13. Horizontal bar; 14. Vertical bar; 15. Lower belt; 16. Lower belt idler; 17. Upper belt; 18. Upper belt idler; 19. Buckle; 20. Hinge; 21. Protrusion; 22. Controller; 23. Intermediate shaft. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0023] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.
[0024] Example:
[0025] like Figures 1-4 As shown, a windproof device for a conveyor belt ventilation door in a coal mine tunneling face is located in the windbreak wall conveyor belt arrangement surface 6 of the tunneling roadway 1. It includes a conveyor belt 5 located in the windbreak wall conveyor belt arrangement surface 6, an upper windbreak structure located above the conveyor belt 5, a lower windbreak structure located below the conveyor belt 5, and a fixed wind-blocking roller 8 located in the conveyor belt 5 that can rotate with its operation.
[0026] The conveyor belt 5 includes an upper belt 17 that runs above and a lower belt 15 that runs below, which are integrally connected.
[0027] The fixed wind-blocking roller 8 is set between the upper belt 17 and the lower belt 15; the intermediate rotating shaft 23 of the fixed wind-blocking roller 8 passes through the middle of the fixed wind-blocking roller 8 and is fixed on the conveyor belt bracket 10.
[0028] In the frontal view, the tunneling roadway 1 is located on the left side of the windbreak wall belt arrangement surface 6, and a tunneling roadway air door 2 is set up. The air door 2 has an air door pressure relief window 3 at its upper part. The windbreak wall belt arrangement surface 6 has an air duct 4, which is located directly above the upper belt pneumatic baffle 7. When a pedestrian passes through the tunneling roadway air door unit, the air door pressure relief window 3 is opened first, and then the tunneling roadway air door 2 is opened. This tunneling roadway air door unit has two tunneling roadway air doors 2, which are arranged on the outside of the tunneling roadway, and the distance between the two tunneling roadway air doors 2 is 5m.
[0029] like Figure 1 or Figure 2 As shown, defined as the front, that is, the front side, then Figure 1 The view is in the frontal view; the conveyor belt 5 is arranged in the front-to-back direction.
[0030] It also includes a conveyor belt support 10 arranged around the conveyor belt 5; the conveyor belt support 10 includes several uprights 14 located on the left and right sides of the conveyor belt 5, and a crossbar 13 connected to the top of the uprights 14 on both sides of the conveyor belt 5 and spanning the conveyor belt 5 on the left and right; a central rotating shaft 23 is arranged in the middle of the fixed wind-blocking roller 8 along the left and right direction, and the two ends of the central rotating shaft 23 are connected to the uprights 14.
[0031] The upper windbreak structure includes an upper belt pneumatic baffle 7 that can flip back and forth; a hinge 20 is provided on the top of the upper belt pneumatic baffle 7, and the upper belt pneumatic baffle 7 is rotatably connected to the windbreak wall belt arrangement surface 6 through the hinge 20; a buckle 19 is provided on the upper belt pneumatic baffle 7, and a cylinder 12 is movably connected to the windbreak wall belt arrangement surface 6 or the transport belt bracket 10, and the movable end of the cylinder 12 is movably connected to the buckle 19; the upper belt pneumatic baffle 7 is flipped by the extension and retraction of the cylinder 12; a fixed seat is provided on the windbreak wall belt arrangement surface 6 or the transport belt bracket 10, one end of the cylinder 12 is rotatably connected to the fixed seat, and a connecting buckle is provided on the other end of the cylinder 12, and the cylinder 12 is rotatably connected to the buckle 19 through the cooperation of the connecting buckle and the buckle 19.
[0032] The bottom of the upper belt pneumatic baffle 7 is integrally provided with a protrusion 21; when the upper belt pneumatic baffle 7 is in a vertical state, the bottom of the protrusion 21 contacts the upper surface of the upper belt 17; when the upper belt 17 is running, there will be a depression in the middle, so the bottom of the protrusion 21 is a downward convex arc shape.
[0033] An upper belt idler roller 18 is provided below the upper belt 17, which can rotate with its operation; a lower belt idler roller 16 is provided below the lower belt 15, which can rotate with its operation; due to the weight of the belts, both the upper belt 17 and the lower belt 15 are concave.
[0034] The fixed wind-blocking roller 8 is located between the lower belt 15 and the upper belt idler 18; the bottom of the fixed wind-blocking roller 8 is in contact with the lower belt 15 and there is a gap between the top and the upper belt idler 18, or the bottom of the fixed wind-blocking roller 8 is in contact with the lower belt 15 and the top is in contact with the upper belt idler 18.
[0035] The lower windbreak structure includes a lower belt fixing baffle 9 fixedly installed directly below the lower belt idler 16; the lower belt fixing baffle 9 is installed at both the front and rear ends of the conveyor belt 5; the lower belt fixing baffle 9 is fixedly connected to the conveyor belt bracket 10.
[0036] A laser velocimeter 11 and a controller 22 are installed on the upper belt pneumatic baffle 7. The controller 22 is electrically connected to the laser velocimeter 11 and the cylinder 12 respectively. When the laser velocimeter 11 detects that the conveyor belt 5 has stopped running, the controller 22 receives the signal and sends the start signal to the cylinder 12. The piston in the cylinder 12 drives the upper belt pneumatic baffle 7 to move, so as to achieve effective contact between the upper belt pneumatic baffle 7 and the upper belt 17. Furthermore, at this position, the backflow of the return air flow and the backflow gas of the return air flow are successfully blocked.
[0037] The usage method includes the following steps:
[0038] Step 1: Arrange the tunnel ventilation door 2, ventilation door pressure relief window 3, ventilation duct 4, and conveyor belt 5 in the tunneling roadway 1; wherein, the two ventilation door pressure relief windows 3 are symmetrically arranged on the two doors of the ventilation door 2. The conveyor belt 5 and the ventilation duct 4 are both arranged in the windbreak wall belt arrangement surface 6, and the tunnel ventilation duct 4 is located above the conveyor belt 5.
[0039] Step 2: Based on the width between the conveyor belt brackets 10, design the lower belt fixing baffle 9 and firmly fix the lower belt fixing baffle 9 between the conveyor belt brackets 10 to achieve effective filling of the gaps under the lower belt idler roller 16.
[0040] Step 3: Based on the gap between the upper belt idler 18 and the lower belt 15 of the conveyor belt 5, design a fixed wind-blocking roller 8; the fixed wind-blocking roller 8 can rotate simultaneously with the operation of the lower belt 15 and the upper belt idler 18, and the fixed wind-blocking roller 8 can effectively seal the gap between the upper and lower belts.
[0041] Step 4: The upper belt pneumatic baffle 7 is connected to the windbreak wall belt arrangement surface 6 via hinge 20, and is connected to the cylinder 12 via connecting buckle 19; the cylinder 12 has a telescopic connecting rod, which is a movable end, to achieve effective control of the extension and retraction process of the upper belt pneumatic baffle 6.
[0042] Step 5: The upper belt pneumatic baffle 7 is acted upon by the cylinder 12 to block the space above the upper belt 17, and retracts when the conveyor belt 5 starts material transport; the arc of the protrusion 21 of the upper belt pneumatic baffle 7 has a good fit with the upper belt 17.
[0043] Step 6: Above the upper belt pneumatic baffle 7 is a laser speed meter 11. When the laser speed meter 11 detects that the conveyor belt 5 has stopped running, the controller 22 receives the signal and sends the start signal to the cylinder 12. The piston connecting rod in the cylinder 12 drives the upper belt pneumatic baffle 7 to move. The protrusion of the upper belt pneumatic baffle 7 coincides with the concave feature of the upper belt 17, realizing the effective contact between the upper belt pneumatic baffle 7 and the upper belt 17.
[0044] Step 7: When the laser speedometer 11 detects that the conveyor belt 5 is running normally, the controller 22 receives the signal and sends the start signal to the cylinder 12. The piston in the cylinder 12 drives the upper belt pneumatic baffle 7 to move, so that the upper belt pneumatic baffle 7 is disengaged from the upper belt 17. After the upper belt pneumatic baffle 7 is retracted, it is parallel to the upper belt. When the controller 22 sends a signal to the cylinder 12, it controls the running state of the upper belt pneumatic baffle 7.
[0045] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
Claims
1. A leak-proof device for the ventilation door of a conveyor belt in a coal mine tunneling face, characterized in that: It includes a conveyor belt (5) located within the windbreak belt arrangement surface (6), an upper windbreak structure located above the conveyor belt (5), a lower windbreak structure located below the conveyor belt (5), and a fixed windbreak roller (8) located within the conveyor belt (5) that can rotate with its operation. The transport belt (5) includes an upper belt (17) and a lower belt (15) that are integrally connected. The fixed wind-blocking roller (8) is positioned between the upper belt (17) and the lower belt (15).
2. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 1, characterized in that: It also includes a conveyor belt support (10) arranged around the conveyor belt (5); the conveyor belt support (10) includes uprights (14) located on the left and right sides of the conveyor belt (5) respectively, and a crossbar (13) connected to the top of the uprights (14); the fixed wind-blocking roller (8) is provided with an intermediate rotating shaft (23) in the middle, and the two ends of the intermediate rotating shaft (23) are connected to the uprights (14).
3. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 1, characterized in that: The upper windbreak structure includes an upper belt pneumatic baffle (7); the top of the upper belt pneumatic baffle (7) is provided with a hinge (20), and the upper belt pneumatic baffle (7) is rotatably connected to the windbreak wall belt arrangement surface (6) through the hinge (20); the upper belt pneumatic baffle (7) is provided with a buckle (19), and a cylinder (12) is movably connected to the windbreak wall belt arrangement surface (6) or the transport belt bracket (10), and the movable end of the cylinder (12) is movably connected to the buckle (19).
4. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 3, characterized in that: The bottom of the upper belt pneumatic baffle (7) is integrally provided with a protrusion (21); when the upper belt pneumatic baffle (7) is in a vertical state, the bottom of the protrusion (21) contacts the upper surface of the upper belt (17).
5. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 1, characterized in that: An upper belt idler (18) is provided below the upper belt (17); a lower belt idler (16) is provided below the lower belt (15).
6. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 5, characterized in that: The fixed wind-blocking roller (8) is located between the lower belt (15) and the upper belt idler (18); the bottom of the fixed wind-blocking roller (8) is in contact with the lower belt (15) and the top is in contact with the upper belt idler (18), or the bottom is in contact with the lower belt (15) and the top is in contact with the upper belt idler (18).
7. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 5, characterized in that: The lower windbreak structure includes a lower belt fixing baffle (9) fixedly installed directly below the lower belt idler (16); the lower belt fixing baffle (9) is fixedly connected to the windbreak wall belt arrangement surface (6) or the transport belt bracket (10).
8. The air leakage prevention device for the conveyor belt ventilation door in a coal mine tunneling face according to claim 3, characterized in that: The upper belt pneumatic baffle (7) is equipped with a laser velocimeter (11) and a controller (22), and the controller (22) is connected to the laser velocimeter (11) and the cylinder (12) respectively.