A sealing device for ventilation doors on underground conveyor belts in coal mines

Abstract

This invention discloses a sealing device for underground conveyor belt ventilation doors in coal mines. It includes a conveyor belt passing through a ventilation door wall, with a sealing device installed at the opening of the ventilation door where the conveyor belt passes through the ventilation door wall. The sealing device includes a fixed frame, with a lower baffle plate at the lower end of the fixed frame. The lower baffle plate has a through hole for the return conveyor belt. A follow-up adjustment component is installed at the lower part of the upper baffle plate to adjust the sealing distance according to different cross-sectional heights of the material in the conveyor belt. This invention, by installing a control follow-up adjustment component at the lower part of the upper baffle plate of the conveyor belt ventilation door sealing device, which can adapt to changes in the height of coal on the conveyor belt, precisely adjusts the sealing distance based on real-time changes in the pressure difference of the intersecting roadway. This fundamentally solves the problem of material blockage on the conveyor belt during coal transport, maximizing the sealing of coal and achieving stable ventilation operation in the intersecting roadway.

Description

Technical Field

[0001] This invention relates to the field of sealing ventilation doors on coal mine conveyor belts, and specifically to a sealing device for ventilation doors on underground conveyor belts in coal mines. Background Technology

[0002] Coal mine underground roadways need to be kept ventilated to prevent gas accumulation and explosion. To facilitate the transportation and connection of coal materials, most underground roadways in coal mines are level roadways. At some level roadway connections, ventilation doors are installed to prevent air leakage. Our mine has more than 150 ventilation doors, of which about 40 are for conveyor belts that pass through the ventilation doors. If the conveyor belt is not properly sealed when passing through the ventilation doors, it will cause air leakage, resulting in insufficient air volume in some areas.

[0003] In existing technologies, backflow prevention devices are used to block the flow in order to solve the above problems (such as...). Figure 8 As shown in the diagram, in the existing anti-backflow device, the return belt is blocked by the lower baffle plate, while the feeding belt 4, which is loaded with material, is blocked by the upper baffle plate 12. However, since the shape of the upper baffle plate 12 is fixed, when the feeding belt 4 is transported and moved, the upper baffle plate 12 is lifted up to a certain height by the cylinder and fixed. In order to avoid large pieces of coal protruding to the top and colliding and blocking the feeding belt 4, a large passage space needs to be left between the upper baffle plate 12 and the material of the feeding belt 4. This will affect the ventilation blocking situation and make it difficult to guarantee the ventilation requirements in the roadway.

[0004] Meanwhile, existing technologies also use flexible baffles for sealing, but flexible rubber baffles are prone to tilting and exposure when subjected to high wind pressure, resulting in poor sealing and air leakage. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a sealing device for ventilation doors on underground conveyor belts in coal mines.

[0006] This invention is achieved through the following technical solution:

[0007] A sealing device for an underground conveyor belt ventilation door in a coal mine includes a conveyor belt passing through a ventilation door wall. A sealing device is installed at the opening of the ventilation door where the conveyor belt passes through the ventilation door wall. The sealing device includes a fixed frame. A lower baffle plate is installed at the lower end of the fixed frame. A through hole for the return belt is opened on the lower baffle plate. An upper baffle plate is installed at the upper end of the fixed frame. It can slide up and down and seal the feeding belt. A follow-up adjustment component is installed at the lower part of the upper baffle plate to adjust the sealing according to the different cross-sectional heights of the material in the feeding belt.

[0008] The follow-up adjustment assembly includes several closely arranged follow-up adjustment units that span the feeding belt. Each follow-up adjustment unit includes a chute opened in the upper baffle plate, and a lifting air rod that slides up and down is provided in the chute. A lifting component is provided on the upper part of the lifting air rod.

[0009] The lifting assembly includes a lifter fixed to the top of the upper wind deflector, and the steel wire rope of the lifter extends downward and is fixedly connected to the top of the lifting air rod in the corresponding slide groove.

[0010] The chute is equipped with a stabilizing component for the smooth operation of the lifting air rod. The stabilizing component includes multiple guide rollers arranged longitudinally at the front and rear ends of the chute. The front and rear ends of the lifting air rod are symmetrically opened with stabilizing grooves and placement grooves arranged in a stepped manner. The stabilizing grooves are matched and contacted with the guide rollers, and the placement grooves are used to place the support ribs on both sides of the guide rollers. The bottom of the lifting air rod is equipped with guide rollers.

[0011] The two sides of the upper wind deflector are fixedly connected to the strip slider inside the fixed frame, and the top of the strip slider is fixedly connected to the piston rod on the adjusting cylinder outside the fixed frame.

[0012] The follow-up adjustment assembly also includes a detection and control system. The detection and control system includes a mounting frame set at the front end of the enclosure. Several rangefinders corresponding to the follow-up adjustment units are installed on the mounting frame. The rangefinders are connected to the controller. The controller is connected to the lifter and the adjusting cylinder of the lifting assembly. The controller is also connected to the drive motor of the conveyor belt.

[0013] Air pressure detectors are installed at the upper and lower entrances of the level roadway where the air door wall is located, and the air pressure detectors are connected to the controller.

[0014] The controller has a preset differential pressure matrix group P0 and a preset follow-up adjustment spacing matrix group S0. For the preset differential pressure matrix group P0 (P1, P2, P3), P1 is the first preset differential pressure, P2 is the second preset differential pressure, and P3 is the third preset differential pressure, with the values ​​of each preset differential pressure increasing sequentially. When the follow-up adjustment component adjusts the spacing of the material on the feeding belt, the pressure difference P detected by the wind pressure detector is transmitted to the controller, which compares P with the parameters in the P0 matrix group.

[0015] When P≤P1, the controller selects the S1 matrix from the S0 matrix group and uses the parameters in the S1 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0016] When P1 < P ≤ P2, the controller selects the S2 matrix from the S0 matrix group and uses the parameters in the S2 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0017] When P2 < P ≤ P3, the controller selects matrix S3 from matrix S0 and uses the parameters in matrix S3 to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0018] For the preset follow-up adjustment spacing matrix group S0(S1, S2, S3), where S1 is the first preset follow-up adjustment spacing matrix, S2 is the second preset follow-up adjustment spacing matrix, and S3 is the third preset follow-up adjustment spacing matrix; the values ​​of each preset follow-up adjustment spacing decrease gradually in sequence.

[0019] The preset follow-up adjustment spacing matrix group S0 value is controlled. During the adjustment control, the distance measuring instrument 22 detects the change value h of the material height on the corresponding follow-up adjustment unit's feeding belt 4 within the time t taken for the feeding belt 4 to move from the distance measuring instrument 22 to the lifting air rod 15. Within the time t taken, the distance measuring instrument 22 controls the speed V of the adjusting elevator 19 to adjust the displacement of the lifting air rod 15 to achieve the adjustment of the spacing of the follow-up adjustment spacing matrix group S0.

[0020] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides a control follow-up adjustment component at the lower part of the upper baffle plate of the belt conveyor damper sealing device, which can adapt to the change in the height of coal on the conveyor belt. The follow-up adjustment component adjusts the sealing distance precisely by changing the pressure difference in the horizontal roadway in real time. This can fundamentally solve the problem of material blockage on the conveyor belt during coal transportation, thereby maximizing the sealing of coal and achieving the stability of ventilation operation in the horizontal roadway. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the damper sealing device of the present invention;

[0022] Figure 2 This is a three-dimensional cross-sectional view of the follow-up adjustment unit of the present invention;

[0023] Figure 3 This is a connection diagram of the detection and control system of the present invention;

[0024] Figure 4 This is a schematic diagram of the arrangement structure of the damper sealing device of the present invention;

[0025] Figure 5 This is a schematic diagram of the working operation of the damper sealing device for the material surface regularity of the feeding belt of the present invention;

[0026] Figure 6 This is a schematic diagram of the operation of the damper sealing device for irregular material surface on the feeding belt of the present invention;

[0027] Figure 7 This is a schematic diagram of the working operation of the damper sealing device of the present invention when the conveyor belt stops running;

[0028] Figure 8 This is a schematic diagram of the structure in the prior art of this invention;

[0029] In the diagram: 1. Roadway 101. Level roadway 101. Air door wall 2. Conveyor belt 3. Feeding belt 4. Return belt 5. Fixed frame 6. Lower wind deflector 7. Through hole 8. Adjustment port 9. Strip slider 10. Adjustment cylinder 11. Upper wind deflector 12. Slide 13. Guide roller 14. Lifting wind rod 15. Stabilizing groove 16. Placement groove 17. Guide roller 18. Lifter 19. Wire rope 20. Mounting frame 21. Rangefinder 22. Controller 23. Wind pressure detector 24. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] like Figure 1 As shown, a sealing device for an underground conveyor belt ventilation door in a coal mine includes a conveyor belt 3 passing through a ventilation door wall 2. A sealing device is installed at the opening of the ventilation door where the conveyor belt 3 passes through the ventilation door wall 2. The sealing device is fixed to the ventilation door wall 2 by expansion bolts, and foam adhesive is used to seal the joint to ensure airtightness. The sealing device includes a fixed frame 6. A lower baffle plate 7 is provided at the lower end of the fixed frame 6. The lower baffle plate 7 has a through hole 8 for passing through the return belt 5. The lower baffle plate 7 is used to seal the return belt 5 to prevent air leakage. At the same time, the top of the lower baffle plate 7 is provided with an arc shape that matches the bottom shape of the upper baffle plate 12. An upper baffle plate 12 that can slide up and down and seal the feeding belt 4 is provided at the upper end of the fixed frame 6. A follow-up adjustment component is provided at the lower part of the upper baffle plate 12 to adjust the sealing according to the different cross-sectional heights of the material in the feeding belt 4. The follow-up adjustment component can seal in real time according to the changes in the cross-sectional area of ​​the material in the conveyor belt 3, and its sealing effect is maximized to ensure the normal operation of ventilation in the horizontal roadway.

[0032] like Figure 2 As shown, the follow-up adjustment assembly includes several closely arranged follow-up adjustment units that span the feeding belt 4. The follow-up adjustment units perform local matching of the coal material on the corresponding feeding belt 4, making the control and adjustment more convenient and faster. Each follow-up adjustment unit includes a chute 13 opened in the upper baffle plate 12. A lifting air rod 15 that slides up and down is provided in the chute 13. A lifting component is provided on the upper part of the lifting air rod 15.

[0033] like Figure 2 As shown, the lifting assembly includes a lifter 19 fixed to the top of the upper baffle plate 12. The lifter 19 is controlled by a variable frequency motor. The lifting speed can be controlled by changing the speed through variable frequency control. The steel wire rope 20 of the lifter 19 extends downward and is fixedly connected to the top of the lifting air rod 15 in the corresponding slide groove 13.

[0034] like Figure 2 As shown, a stabilizing component is provided inside the chute 13 to ensure the smooth movement of the lifting boom 15. The stabilizing component can ensure the smoothness of the lifting boom 15's up and down movement and avoid the dry phenomenon between the lifting boom 15 and the coal material caused by jamming. The stabilizing component includes multiple guide rollers 14 arranged longitudinally in the front and rear ends of the chute 13. The front and rear ends of the lifting boom 15 are symmetrically opened with stabilizing grooves 16 and placement grooves 17 arranged in a stepped manner. The stabilizing grooves 16 are matched and contacted with the guide rollers 14. The placement grooves 17 are used to place the support ribs on both sides of the guide rollers 14. The bottom of the lifting boom 15 is equipped with guide rollers 18. The guide rollers 18 prevent the lifting boom 15 from dry friction with the feeding belt 4 and extend the service life of the feeding belt 4.

[0035] like Figure 1 As shown, the two sides of the upper baffle plate 12 are fixedly connected to the strip slider 10 inside the fixed frame 6, and the top of the strip slider 10 is fixedly connected to the piston rod on the adjusting cylinder 11 outside the fixed frame 6. By adjusting the cylinder 11 to control the rapid lifting of the upper baffle plate 12, the passage of large pieces of material exceeding the adjustment distance of the follow-up adjustment component is ensured.

[0036] like Figure 1 , 3 As shown, the follow-up adjustment assembly also includes a detection and control system. The detection and control system includes a mounting frame 21 set at the front end of the enclosure. Several rangefinders 22 corresponding to the follow-up adjustment units are installed on the mounting frame 21. The rangefinders 22 are connected to the controller 23. The controller 23 is connected to the lifter 19 of the lifting assembly and the adjusting cylinder 11. The controller 23 is connected to the drive motor of the conveyor belt 3.

[0037] like Figure 4 As shown, wind pressure detectors 24 are installed at the upper and lower ends of the level roadway 101 where the air door wall 2 is located. The wind pressure detectors 24 are connected to the controller 23 and the two wind pressure detectors 24 will feed back the detected pressure difference P0.

[0038] The controller 23 has a preset differential pressure matrix group P0 and a preset follow-up adjustment spacing matrix group S0. For the preset differential pressure matrix group P0 (P1, P2, P3), P1 is the first preset differential pressure, P2 is the second preset differential pressure, and P3 is the third preset differential pressure, with the values ​​of each preset differential pressure increasing sequentially. When the follow-up adjustment component adjusts the spacing of the material on the feeding belt 4, the pressure difference P detected by the wind pressure detector 24 is transmitted to the controller 23, and the controller 23 compares P with the parameters in the P0 matrix group.

[0039] Based on the site conditions, select P1 at 20pA, P2 at 25pA, and P3 at 30pA. The actual pressure difference value is selected and set according to the different roadway cross sections and ventilation volume on site.

[0040] When P≤P1, the controller 23 selects the S1 matrix from the S0 matrix group and uses the parameters in the S1 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0041] When P1 < P ≤ P2, the controller 23 selects the S2 matrix from the S0 matrix group and uses the parameters in the S2 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0042] When P2 < P ≤ P3, the controller 23 selects the S3 matrix from the S0 matrix group and uses the parameters in the S3 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components.

[0043] For the preset follow-up adjustment spacing matrix group S0 (S1, S2, S3), S1 is the first preset follow-up adjustment spacing matrix, S2 is the second preset follow-up adjustment spacing matrix, and S3 is the third preset follow-up adjustment spacing matrix; the values ​​of each preset follow-up adjustment spacing gradually decrease in sequence.

[0044] Based on the site conditions, select S1 as 50mm, S2 as 30mm, and S3 as 20mm. The selected S1 should not be too large, otherwise air leakage will be more serious. The selected S3 value should not be too small, otherwise it will easily cause friction between the lifting air rod 15 and the coal surface. The parameters set by the above controller should enable the device to operate most stably with the values ​​of P1 < P ≤ P2 and S2 in the range.

[0045] The preset follow-up adjustment spacing matrix group S0 value is controlled. During the adjustment control, the distance measuring instrument 22 detects the change value h of the material height on the corresponding follow-up adjustment unit's feeding belt 4 within the time t taken for the feeding belt 4 to move from the distance measuring instrument 22 to the lifting air rod 15. Within the time t taken, the distance measuring instrument 22 controls the speed V of the adjusting elevator 19 to adjust the displacement of the lifting air rod 15 to achieve the adjustment of the spacing of the follow-up adjustment spacing matrix group S0.

[0046] The implementation principle of the coal mine underground conveyor belt ventilation door sealing device according to the embodiments of this application is as follows:

[0047] When the conveyor belt 3 passing through the damper wall 2 stops running, the feeding belt 4 has no material being conveyed (e.g. Figure 7As shown), the drive motor of the conveyor belt 3 transmits a stop signal to the controller 23. The controller 23 controls the follow-up adjustment unit of the follow-up adjustment component on the baffle plate 12 to adjust and block. The lifter 19 on the follow-up adjustment unit rotates and lowers the corresponding lifting air bar 15 through the steel wire rope 20 to contact the feeding belt 4, so as to completely block the ventilation of the feeding belt 4 when there is no material.

[0048] When transporting materials on conveyor belt 3 (e.g.) Figure 5 As shown), the feeding belt 4 carries the coal towards the damper sealing device. When the coal reaches the detection and control system mounting frame 21, each laser rangefinder 22 on the mounting frame 21 detects the height value h of the lower coal and transmits the height value signal to the controller 23. The controller 23 controls each elevator 19 to move a certain distance D within the time t taken for the feeding belt 4 to move from the rangefinder 22 to the lifting air rod 15 (since the moving speed of the feeding belt 4 remains constant, the time t taken is fixed).

[0049] Where D = h - SO, SO is the set follow-up adjustment distance between the bottom of the lifting air rod 15 and the coal material 24. Simultaneously, the controller 23, based on the movement distance D, controls the elevator 19 to move at a certain speed V within the time t, ensuring that the lifting air rod 15 and the coal material 24 of each follow-up adjustment unit of the follow-up adjustment assembly are not always kept at the value of SO for precise control. During the subsequent coal transportation process of the feeding belt 4, if there are protruding coal lumps on the feeding belt 4 (such as...), Figure 6 As shown in the figure, the corresponding follow-up adjustment unit will also adjust and control according to the above principle;

[0050] The controller 23 adjusts the value of SO by detecting the pressure difference P0 value at the upper and lower openings of the level roadway 101 using two air pressure detectors 24. Within each set range, the controller synchronously controls the change of SO value. When the pressure difference P0 value is large, it indicates that there is a lot of air leakage and the sealing is relatively loose. The controller 23 adjusts the value of SO to a relatively small value to control the air leakage to the greatest extent. When the pressure difference P0 value is small, it indicates that the ventilation is normal. The controller 23 adjusts the value of SO to a relatively large value. In this way, the lifting air rod 15 and the coal material 24 are kept at a relatively wide range of values ​​to ensure the stability of the system operation.

[0051] When the rangefinder 22 detects that the height of a large piece of coal exceeds the limit value of the movement of the lifting air manipulator 15 (this limit value is the value from the bottom of the lifting air manipulator 15 to the bottom of the upper baffle plate 12), the controller 23 will control the adjustment cylinder 11 to start, and the upper baffle plate 12 in the fixed frame 6 will be moved up quickly through the strip slider 10. When the large piece of coal passes through the device, the controller 23 will control the lifting air manipulator 15 to return to its original position, ensuring the stable operation of the entire sealing device. In this way, through precise control, the sealing section can be adjusted at any time according to the different sections of coal during the operation of the conveyor belt, so as to maximize the sealing effect and achieve the operational stability of ventilation in the cross-section roadway.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine underground transport belt air door sealing device, comprising a transport belt (3) passing through an air door wall (2), the transport belt (3) is provided with a closer at the opening air door of the air door wall (2), characterized in that: The closure includes a fixed frame (6), a lower baffle plate (7) is provided at the lower end of the fixed frame (6), and a through hole (8) for passing through the return belt (5) is opened on the lower baffle plate (7). An upper baffle plate (12) is provided at the upper end of the fixed frame (6) that can slide up and down and close the feeding belt (4). A follow-up adjustment component is provided at the lower part of the upper baffle plate (12) to adjust the closure according to the different cross-sectional heights of the material in the feeding belt (4). The follow-up adjustment assembly includes several closely arranged follow-up adjustment units that span the feeding belt (4). Each follow-up adjustment unit includes a chute (13) opened in the upper baffle plate (12). A lifting air rod (15) that slides up and down is provided in the chute (13). A lifting component is provided on the upper part of the lifting air rod (15). The lifting assembly includes a lifter (19) fixed to the top of the upper baffle (12), and the wire rope (20) of the lifter (19) extends downward and is fixedly connected to the top of the lifting wind rod (15) in the corresponding slide groove (13). A wind pressure detector (24) is installed at the upper and lower ends of the level roadway (101) where the air door wall (2) is located, and the wind pressure detector (24) is connected to the controller (23). The controller (23) is provided with a preset pressure difference matrix P0 and a preset follow-up adjustment spacing matrix group S0; for the preset pressure difference matrix P0 (P1, P2, P3), P1 is the first preset pressure difference, P2 is the second preset pressure difference, and P3 is the third preset pressure difference, and the values ​​of each preset pressure difference gradually increase in sequence; when the follow-up adjustment component adjusts the spacing of the material on the feeding belt (4), the pressure difference P detected by the wind pressure detector (24) will transmit the detection result to the controller (23), and the controller (23) will compare P with the parameters in the P0 matrix; When P≤P1, the controller (23) selects the S1 matrix from the S0 matrix group and uses the parameters in the S1 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components. When P1 < P ≤ P2, the controller (23) selects the S2 matrix from the S0 matrix group and uses the parameters in the S2 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components. When P2 < P ≤ P3, the controller (23) selects the S3 matrix from the S0 matrix group and uses the parameters in the S3 matrix to adjust the operating state of each component in order to control the spacing of the follow-up adjustment components. For the preset follow-up adjustment spacing matrix group S0(S1, S2, S3), where S1 is the first preset follow-up adjustment spacing matrix, S2 is the second preset follow-up adjustment spacing matrix, and S3 is the third preset follow-up adjustment spacing matrix; the values ​​of each preset follow-up adjustment spacing decrease gradually in sequence.

2. The underground coal mine transportation belt air door sealing device according to claim 1, characterized in that: The chute (13) is provided with a stabilizing component for the smooth operation of the lifting air rod (15). The stabilizing component includes multiple guide rollers (14) arranged longitudinally in the front and rear ends of the chute (13). The front and rear ends of the lifting air rod (15) are symmetrically provided with stabilizing grooves (16) and placement grooves (17) arranged in a stepped manner. The stabilizing grooves (16) are matched and contacted with the guide rollers (14). The placement grooves (17) are used to place the support ribs on both sides of the guide rollers (14). The bottom of the lifting air rod (15) is equipped with guide rollers (18).

3. The underground coal mine transportation belt air door sealing device according to claim 1, characterized in that: The two sides of the upper windshield (12) are fixedly connected to the strip slider (10) inside the fixed frame (6), and the top of the strip slider (10) is fixedly connected to the piston rod on the adjusting cylinder (11) outside the fixed frame (6).

4. The underground coal mine transportation belt air door sealing device according to claim 3, characterized in that: The follow-up adjustment assembly also includes a detection and control system. The detection and control system includes a mounting frame (21) set at the front end of the enclosure. Several rangefinders (22) corresponding to the follow-up adjustment units are installed on the mounting frame (21). Several rangefinders (22) are controlled and connected to a controller (23). The controller (23) is controlled and connected to the lifter (19) of the lifting assembly and the adjusting cylinder (11). The controller (23) is controlled and connected to the drive motor of the conveyor belt (3).

5. A sealing device for an underground conveyor belt ventilation door in a coal mine according to claim 1, characterized in that: The preset follow-up adjustment spacing matrix group S0 value is controlled. During the adjustment control, the time t is taken for the feeding belt (4) to move from the distance measuring instrument (22) to the lifting air rod (15). During this time t, the distance measuring instrument (22) detects the change value h of the material height on the feeding belt (4) of the corresponding follow-up adjustment unit. During this time t, the controller (23) controls the speed V of the adjusting lifter (19) to adjust the displacement of the lifting air rod (15) to realize the adjustment of the spacing of the follow-up adjustment spacing matrix group S0.

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