Automatic opening and closing device for explosion door of coal mine air shaft

Abstract

The invention provides a coal mine air shaft explosion door automatic opening and closing device which comprises a stand column, an explosion door and a driving assembly, and the stand column is fixedly arranged in the middle of the front end of an explosion door channel; the explosion door comprises a first door plate and a second door plate which are located on the two sides of the stand column respectively and pivoted to the stand column respectively. The driving assembly comprises a mounting frame and a wedge-shaped part, the mounting frame is arranged on the front side of the stand column, the wedge-shaped part is slidably connected to the upper end of the mounting frame in the front-back direction, and the end, close to the stand column, of the wedge-shaped part is small in opening size while the end, away from the stand column, of the wedge-shaped part is large in opening size. According to the automatic opening and closing device for the anti-explosion door of the coal mine air shaft, when the interior of the anti-explosion door channel is in a negative pressure environment, the inlet air flow generates thrust on the wedge-shaped part to drive the wedge-shaped part to slide in the direction close to the stand column so as to drive the first door plate and the second door plate to rotate in the door closing direction; compared with the prior art, the closing reliability of the first door plate and the second door plate is improved.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof door technology, and more specifically, to an automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts. Background Technology

[0002] A coal mine ventilation shaft is a dedicated roadway connecting various underground work areas and the mine's intake air shaft. A main fan is installed at its end. The main fan draws air out of the mine, and in conjunction with various ventilation equipment and facilities, ensures the orderly flow of air throughout the underground work areas, providing oxygen supply, cooling, and dust removal. This constitutes the basic ventilation system of underground mining operations, ensuring a suitable and safe working environment. Explosion-proof doors are installed at the ends of branch roadways along the ventilation shaft axis, upstream of the main fan inlet. When the main fan is shut down for maintenance or malfunctions, the negative pressure in the ventilation shaft decreases, requiring the explosion-proof doors to open automatically to increase natural ventilation and meet minimum ventilation requirements. Once the main fan is open, the explosion-proof doors must close immediately to prevent air leakage that could affect the overall ventilation efficiency of the system.

[0003] To achieve automatic opening and closing of explosion-proof doors, existing technologies typically involve installing a negative pressure sensor inside the tunnel. When the sensor detects a decrease in negative pressure to a set value, it determines that the main door should stop and controls the wire rope winch to open the explosion-proof door. Conversely, when the sensor detects an increase in negative pressure to the set value, it determines that the main door should open and controls the wire rope winch to close the door. However, this approach has a drawback: if the negative pressure sensor or control system malfunctions, the explosion-proof door may fail to close in a timely manner. Summary of the Invention

[0004] This invention provides an automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts, which solves the technical problem in the prior art where a negative pressure sensor is used to detect the negative pressure value in the roadway, and the opening and closing of the explosion-proof door is controlled based on the relationship between the negative pressure value and a set value. However, if the negative pressure sensor and control system malfunction, the explosion-proof door may not be able to be closed in time.

[0005] This invention provides an automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts, comprising: The column is fixed in the middle of the front end of the explosion-proof door passage; An explosion-proof door, comprising a first door panel and a second door panel, wherein the first door panel and the second door panel are respectively located on both sides of the upright and are respectively pivotally connected to the upright; and, The drive assembly includes a mounting bracket, a wedge-shaped component, and a return spring. The mounting bracket is disposed on the front side of the column. The wedge-shaped component is slidably connected to the upper end of the mounting bracket in a front-back direction. The opening size of the wedge-shaped component is small at the end near the column and large at the end away from the column. The wedge-shaped component is configured such that when the first door panel and the second door panel are opened, the explosion-proof door passage is in a negative pressure environment. Under the action of the incoming airflow, the wedge-shaped component slides in the direction close to the column, so that the side of the wedge-shaped component can abut against the first door panel and the second door panel, and drive the first door panel and the second door panel to rotate in the closing direction. The two ends of the return spring are respectively connected to the wedge-shaped component and the mounting bracket. The return spring always has a tendency to drive the wedge-shaped component to move in the direction away from the column.

[0006] Optionally, the driving component further includes a return spring, the two ends of which are respectively connected to the wedge-shaped component and the mounting bracket, and the return spring always has the tendency to drive the wedge-shaped component to move in a direction away from the column.

[0007] Optionally, the drive component further includes an air collection trough, which is fixed to the end of the wedge-shaped component away from the column.

[0008] Optionally, the opening shape of the air collection trough is rectangular, trapezoidal, or arc-shaped.

[0009] Optionally, the upper end of the mounting bracket is provided with a slide rail, and the wedge-shaped component is slidably connected to the slide rail.

[0010] Optionally, the cross-sectional shape of the wedge-shaped component is trapezoidal, triangular, or arc-shaped.

[0011] Optionally, it further includes a counterweight assembly, a first traction rope, and a second traction rope. The counterweight assembly is located on the front side of the column. The first end of the first traction rope is connected to the end of the first door panel away from the column, and the second end is connected to the counterweight assembly. The first end of the second traction rope is connected to the second door panel, and the second end is connected to the counterweight assembly. The counterweight assembly is configured such that: if the explosion-proof door passage is in a slightly negative pressure environment, the weight of the counterweight assembly exerts a pulling force on the first door panel through the first traction rope, which can drive the first door panel to rotate in the opening direction; the weight of the counterweight assembly exerts a pulling force on the second door panel through the second traction rope, which can drive the second door panel to rotate in the opening direction.

[0012] Optionally, the counterweight assembly includes a mounting column, a first pulley, a second pulley, a first counterweight block, and a second counterweight block. The lower end of the mounting column is fixed to the ground on the front side of the column. The first pulley is pivotally connected to the upper end of the mounting column. The second end of the first traction rope passes around the first pulley and is connected to the first counterweight block. The second pulley is pivotally connected to the upper end of the mounting column. The second end of the second traction rope passes around the second pulley and is connected to the second counterweight block.

[0013] Optionally, the first door panel is provided with a first pull ring at the end away from the column, and the first end of the first traction rope is connected to the first pull ring; the second door panel is provided with a second pull ring at the end away from the column, and the first end of the second traction rope is connected to the second pull ring.

[0014] Optionally, the first door panel is connected to the column via a first hinge, and the second door panel is connected to the column via a second hinge.

[0015] The automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts provided by this invention has at least the following beneficial technical effects: By installing a wedge-shaped component on the outside of the explosion-proof door, which slides along the mounting bracket in the front-to-back direction, the end of the wedge-shaped component near the column can extend into the middle of the first and second door panels after they are opened. When the explosion-proof door passage is under negative pressure, a large airflow is formed at the front end of the passage. The airflow exerts a thrust on the wedge-shaped component, driving it to slide along the direction near the column. This causes the side of the wedge-shaped component to abut against the first and second door panels, thereby increasing the angle between them and driving them to rotate in the closing direction. In other words, the wedge-shaped component can push the first and second door panels to the position of effective closing arm and torque. Under the action of negative pressure suction, the first and second door panels can continue to rotate in the closing direction until they are completely closed. Compared with the prior art, this invention does not rely on a negative pressure sensor to detect and control the closing of the first and second door panels, reducing or even avoiding the risk of failure to close the first and second door panels in time when the negative pressure sensor and control system malfunction, thus improving the reliability of closing the first and second door panels. Attached Figure Description

[0016] Figure 1 This is a front sectional view of an automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts, provided in an embodiment of the present invention. Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of BB.

[0017] Explanation of reference numerals in the attached figures: 10. Column; 101. First hinge; 102. Second hinge; 20. First door panel; 201. First pull ring; 30. Second door panel; 301. Second pull ring; 40. Counterweight assembly; 401. Mounting column; 402. First pulley; 403. Second pulley; 404. First counterweight block; 405. Second counterweight block; 406. First traction rope; 407. Second traction rope; 408. Connecting rod; 50. Drive assembly; 501. Mounting bracket; 502. Wedge-shaped component; 503. Air collection slot; 504. Return spring; 505. Slide rail; 506. Limiting part 506. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with the accompanying drawings. Figure 1-3 Specific embodiments of the present invention will be described in detail below.

[0019] In this invention, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] This invention provides an automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts, see attached document. Figure 1-3The automatic opening and closing device for the explosion-proof door of the coal mine ventilation shaft includes a column 10, an explosion-proof door, and a drive assembly 50. The column 10 is fixedly installed in the middle of the front end of the explosion-proof door passage 1. The explosion-proof door includes a first door panel 20 and a second door panel 30, which are located on both sides of the column 10 and pivotally connected to the column 10. The drive assembly 50 includes a mounting frame 501 and a wedge-shaped component 502. The mounting frame 501 is located on the front side of the column 10, and the wedge-shaped component 502 is slidably connected to the mounting frame 501 in the front-rear direction. At the upper end, the wedge-shaped component 502 has a small opening size at the end near the column 10 and a large opening size at the end away from the column 10; the wedge-shaped component 502 is configured such that: if the first door panel 20 and the second door panel 30 are opened, the explosion-proof door passage 1 is in a negative pressure environment. Under the action of the airflow, the wedge-shaped component 502 slides in the direction close to the column 10 so that the side of the wedge-shaped component 502 can abut against the first door panel 20 and the second door panel 30, and drive the first door panel 20 and the second door panel 30 to rotate in the closing direction. It should be noted that when the main fan in the coal mine ventilation shaft is open and the explosion-proof door passage 1 is in a negative pressure environment, a large airflow is formed at the front end of the explosion-proof door passage 1. The airflow drives the wedge-shaped component 502 to slide along the direction close to the column 10, thereby driving the first door panel 20 and the second door panel 30 to rotate in the closing direction after opening. Compared with the prior art, the present invention does not rely on the negative pressure sensor to detect and control the closing of the first door panel 20 and the second door panel 30, reducing or even avoiding the risk of failure of the negative pressure sensor and control system, which may lead to the inability to close the first door panel 20 and the second door panel 30 in time, thereby improving the reliability of closing the first door panel 20 and the second door panel 30.

[0021] The automatic opening and closing device for explosion-proof doors in coal mine ventilation shafts provided in this embodiment of the invention uses a wedge-shaped component 502 that is slidably connected to a mounting frame 501 in the front-rear direction outside the explosion-proof door. One end of the wedge-shaped component 502 near the column 10 can extend into the middle of the first door panel 20 and the second door panel 30 after opening. When the explosion-proof door passage 1 is under negative pressure, a large airflow is formed at the front end of the explosion-proof door passage 1. This airflow generates a thrust on the wedge-shaped component 502, driving it to move along the path near the column 10. The wedge-shaped component 502 slides in the direction of closing, causing its side to abut against the first door panel 20 and the second door panel 30, thereby increasing the included angle between the first door panel 20 and the second door panel 30 to drive the first door panel 20 and the second door panel 30 to rotate in the closing direction. That is, the wedge-shaped component 502 can push the first door panel 20 and the second door panel 30 to the position of effective closing force arm and closing torque. Under the action of negative pressure suction, the first door panel 20 and the second door panel 30 can continue to rotate in the closing direction until they are completely closed.

[0022] In this embodiment of the invention, see appendix. Figure 2The driving component also includes a return spring 504, with its two ends connected to the wedge-shaped component 502 and the mounting bracket 501, respectively. The return spring 504 always has a tendency to drive the wedge-shaped component 502 to move away from the column 10. It should be noted that the return spring 504 can be a tension spring or a compression spring, depending on its installation position. With this configuration, since the airflow generates a thrust on the wedge-shaped component 502, during the movement of the wedge-shaped component 502 towards the column 10, the return spring 504 deforms and stores elastic potential energy. After the first door panel 20 and the second door panel 30 are completely closed, the negative pressure disappears, the wedge-shaped component 502 loses its thrust, and the wedge-shaped component 502 slides away from the column 10 under the action of the elastic potential energy stored in the return spring 504.

[0023] In this embodiment of the invention, see appendix. Figure 2 and Figure 3 The driving component also includes an air collecting trough 503, which is fixed to the end of the wedge-shaped component 502 away from the column 10. With this configuration, by setting the air collecting trough 503 at the end of the wedge-shaped component 502 away from the column 10, the airflow thrust can be increased by increasing the air collecting area under a certain negative pressure, which facilitates driving the first door panel 20 and the second door panel 30 to rotate in the closing direction.

[0024] In this embodiment of the invention, the opening shape of the air collecting trough 503 can be various, such as rectangular, trapezoidal or arc-shaped, or other shapes, as long as they can increase the air collecting area, and are not limited here.

[0025] In this embodiment of the invention, see appendix. Figure 2 The upper end of the mounting bracket 501 is provided with a slide rail 505, and the wedge-shaped component 502 is slidably connected to the slide rail 505. This arrangement reduces friction.

[0026] In this embodiment of the invention, see appendix. Figure 2 The two ends of the return spring 504 are connected to the wedge-shaped component 502 and the slide rail 505, respectively.

[0027] In this embodiment of the invention, see appendix. Figure 2 The upper end of the mounting bracket 501, away from the column 10, is provided with a limiting part 506, which can abut against the wedge-shaped component 502. This arrangement achieves the limiting of the wedge-shaped component 502.

[0028] In this embodiment of the invention, the cross-sectional shape of the wedge-shaped component 502 can be various, such as trapezoidal, triangular or arc-shaped, or other shapes, as long as the wedge-shaped component 502 satisfies the requirement that the opening size at the end near the column 10 is small and the opening size at the end away from the column 10 is large, and no limitation is made here.

[0029] In this embodiment of the invention, see appendix. Figure 3 The automatic opening and closing device also includes a counterweight assembly 40, a first traction rope 406, and a second traction rope 407. The counterweight assembly 40 is located on the front side of the column 10. The first end of the first traction rope 406 is connected to the end of the first door panel 20 away from the column 10, and the second end is connected to the counterweight assembly 40. The first end of the second traction rope 407 is connected to the second door panel 30, and the second end is connected to the counterweight assembly 40. The counterweight assembly 40 is configured such that if the explosion-proof door passage 1 is in a slightly negative pressure environment, the weight of the counterweight assembly 40 forms a pulling force on the first door panel 20 through the first traction rope 406, which can drive the first door panel 20 to rotate in the opening direction. The weight of the counterweight assembly 40 forms a pulling force on the second door panel 30 through the second traction rope 407, which can drive the second door panel 30 to rotate in the opening direction. It should be noted that when the main fan in the coal mine ventilation shaft is closed, the explosion-proof door passage 1 is in a slightly negative pressure environment. The traction force of the counterweight component 40 on the first door panel 20 and the second door panel 30 is greater than the resistance of the negative pressure on the first door panel 20 and the second door panel 30, which can realize the automatic opening of the first door panel 20 and the second door panel 30. With this setting, if the explosion-proof door passage 1 is in a slightly negative pressure environment, the first door panel 20 and the second door panel 30 can be rotated in the opening direction by the counterweight component 40 until the opening angle of the first door panel 20 and the second door panel 30 approaches 90°, which can realize the automatic and complete opening of the first door panel 20 and the second door panel 30. This can increase the ventilation volume of the coal mine ventilation shaft and is beneficial to the ventilation safety of the mine. In addition, the counterweight traction structure is simple and reliable.

[0030] In this embodiment of the invention, see appendix. Figure 2 and Figure 3The counterweight assembly 40 includes a mounting column 401, a first pulley 402, a second pulley 403, a first counterweight block 404, and a second counterweight block 405. The lower end of the mounting column 401 is fixed to the ground on the front side of the column 10. The first pulley 402 is pivotally connected to the upper end of the mounting column 401. The second end of the first traction rope 406 passes over the first pulley 402 and is connected to the first counterweight block 404. The second pulley 403 is pivotally connected to the upper end of the mounting column 401. The second end of the second traction rope 407 passes over the second pulley 403 and is connected to the second counterweight block 405. With this configuration, the first end of the first traction rope 406 is connected to the end of the first door panel 20 away from the column 10, and the second end is connected to the first counterweight 404 after being turned 90° by the first pulley 402, thereby generating an opening torque on the first door panel 20. Similarly, the first end of the second traction rope 407 is connected to the end of the second door panel 30 away from the column 10, and the second end is connected to the second counterweight 405 after being turned 90° by the second pulley 403, thereby generating an opening torque on the second door panel 30. The opening torque is much greater than the negative pressure resistance, thereby enabling the first door panel 20 and the second door panel 30 to complete the automatic opening action.

[0031] In this embodiment of the invention, see appendix. Figure 3 A connecting rod 408 is fixedly mounted on the upper end of the mounting column 401, and the first pulley 402 and the second pulley 403 are respectively pivotally connected to the two ends of the connecting rod 408. In this embodiment of the invention, see appendix. Figure 1 and Figure 3 The first door panel 20 has a first pull ring 201 at the end away from the column 10, and the first end of the first traction rope 406 is connected to the first pull ring 201; the second door panel 30 has a second pull ring 301 at the end away from the column 10, and the first end of the second traction rope 407 is connected to the second pull ring 301.

[0032] In this embodiment of the invention, see appendix. Figure 1 and Figure 3 The first door panel 20 is connected to the column 10 via the first hinge 101, and the second door panel 30 is connected to the column 10 via the second hinge 102.

[0033] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A coal mine air shaft explosion door automatic opening and closing device, characterized in that, The utility model relates to a kind of explosion door drive mechanism, including: Stand (10), it is fixed in the middle part of the front end of explosion door passage (1); Explosion door, including first door plate (20) and second door plate (30), the first door plate (20) and the second door plate (30) are located at the two sides of the stand (10) respectively and are pivoted to the stand (10) respectively;And, Drive assembly (50), including mounting bracket (501) and wedge component (502), the mounting bracket (501) is located at the front side of the stand (10), the wedge component (502) is slidably connected to the upper end of the mounting bracket (501) in front-back direction, the opening size of the end of the wedge component (502) close to stand (10) is small and the opening size of the end of the wedge component (502) away from stand (10) is large;The wedge component (502) is configured: if the first door plate (20) and the second door plate (30) open, the explosion door passage (1) is negative pressure environment, under the effect of air flow force, the wedge component (502) slides in the direction close to the stand (10), to make the side surface of the wedge component (502) can be abutted to the first door plate (20) and the second door plate (30), and drive the first door plate (20) and the second door plate (30) rotate in the direction of closing door.

2. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 1, characterized in that, The drive component further includes reset spring (504), two ends of the reset spring (504) are connected to the wedge component (502) and the mounting bracket (501) respectively, the reset spring (504) always has the movement tendency of driving the wedge component (502) in the direction away from the stand (10).

3. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 1, characterized in that, The drive component further includes wind collecting groove (503), the wind collecting groove (503) is fixed to the end of the wedge component (502) away from the stand (10).

4. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 3, characterized in that, The opening shape of the wind collecting groove (503) is rectangle, trapezoidal or circular arc.

5. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 1, characterized in that, The upper end of the mounting bracket (501) is provided with slide rail (505), and the wedge component (502) is slidably connected to the slide rail (505).

6. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 1, characterized in that, The cross-sectional shape of the wedge component (502) is trapezoidal, triangular or circular arc.

7. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 1, characterized in that, The explosion-proof door further comprises a counterweight assembly (40), a first traction rope (406) and a second traction rope (407), the counterweight assembly (40) is arranged on the front side of the stand (10), the first end of the first traction rope (406) is connected to one end of the first door panel (20) away from the stand (10), and the second end is connected to the counterweight assembly (40); the first end of the second traction rope (407) is connected to the second door panel (30), and the second end is connected to the counterweight assembly (40); the counterweight assembly (40) is configured such that, if the explosion-proof door passage (1) is in a micro-negative pressure environment, the gravity of the counterweight assembly (40) forms a pulling force on the first door panel (20) through the first traction rope (406), which can drive the first door panel (20) to rotate in the door opening direction; the gravity of the counterweight assembly (40) forms a pulling force on the second door panel (30) through the second traction rope (407), which can drive the second door panel (30) to rotate in the door opening direction.

8. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 7, characterized in that, The counterweight assembly (40) comprises a mounting column (401), a first pulley (402), a second pulley (403), a first counterweight block (404) and a second counterweight block (405), the lower end of the mounting column (401) is fixedly arranged on the ground on the front side of the stand (10), the first pulley (402) is pivotally connected to the upper end of the mounting column (401), and the second end of the first traction rope (406) passes through the first pulley (402) and is connected to the first counterweight block (404); the second pulley (403) is pivotally connected to the upper end of the mounting column (401), and the second end of the second traction rope (407) passes through the second pulley (403) and is connected to the second counterweight block (405).

9. The automatic opening and closing device for the explosion door of the air shaft of the coal mine according to claim 7, characterized in that, One end of the first door panel (20) away from the stand (10) is provided with a first pull ring (201), and the first end of the first traction rope (406) is connected to the first pull ring (201); one end of the second door panel (30) away from the stand (10) is provided with a second pull ring (301), and the first end of the second traction rope (407) is connected to the second pull ring (301).

10. The automatic opening and closing device for coal mine air shaft explosion door according to claim 1, characterized in that, The first door panel (20) is connected to the stand (10) through a first hinge (101), and the second door panel (30) is connected to the stand (10) through a second hinge (102).

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