Split self-recovery vertical shaft explosion door

Abstract

A split self-recovery vertical shaft explosion door is composed of a foundation, a door frame, a movable door body, a hydraulic adjusting heavy hammer device, a locking device, a buffer limiting device, a hydraulic station and a remote operation table. The foundation is arranged around an original wellhead foundation; the door frame is fixed on a foundation; locking devices are fixedly mounted at two ends of the door frame; the lower portions of the two movable door bodies are hinged to the door frame, and the two movable door bodies are symmetrically installed on the two sides of the door frame. The movable door body is connected with the hydraulic adjusting heavy hammer device and the buffer limiting device, and a circle of sealing gasket is arranged on the inner side of the movable door body. The hydraulic station is communicated with the hydraulic adjusting heavy hammer device and the hydraulic cylinder of the locking device through oil pipes, and the hydraulic station is electrically connected with the remote operation table. The two movable doors are matched with the door frame, the hydraulic adjusting heavy hammer device, the locking device, the buffer limiting device, the hydraulic station and the remote operation table, so that various use requirements of the explosion door are met; the structure is compact, the sealing effect is good, installation and debugging are easy and convenient, the automation degree is high, and good application prospects are achieved.

Description

Technical Field

[0001] The utility model relates to a double-opening self-recovering vertical shaft explosion-proof door. Background Art

[0002] Mine ventilation systems supply fresh air to coal mines, meeting the oxygen needs of personnel, diluting and removing toxic and harmful gases and dust, regulating the underground climate, and creating a favorable working environment. They are essential safety features for ensuring safe coal mine production. The functions of coal mine ventilation shafts are as follows: 1. When a gas or coal dust explosion creates a blast wave that impacts the vertical ventilation shaft, the explosion-proof door immediately rises and opens to relieve pressure, preventing the blast wave's pressure from impacting the ventilation fan and protecting the fan's normal operation. After the blast wave dissipates, the door lowers back down to the shaft under its own weight and the negative pressure from the ventilation fan. 2. During normal ventilation, the door remains closed due to negative pressure. 3. If the ventilation fan is stopped for any reason, the door rises and opens freely due to the pull of a counterweight and the air pressure differential inside and outside the shaft, utilizing natural wind pressure for ventilation. 4. When reverse wind is required in the event of an underground accident or during a reverse wind drill, the reverse wind device locks the door securely, ensuring reverse wind within 10 minutes. The Coal Mine Safety Regulations stipulate that "the main ventilation fans in production mines must be equipped with reverse wind facilities and be able to change the wind direction in the tunnel within 10 minutes; when the wind direction is changed, the air supply volume of the main ventilation fans should not be less than 40% of the normal air supply volume."

[0003] Coal mines currently widely use MFBL-type vertical ventilation shaft explosion-proof doors. These doors consist of a conical shell welded from steel plates, buckled into the top of the shaft and capable of sliding up and down. Their disadvantages include: 1. The doors are heavy, requiring a long time to open during pressure relief and prone to jamming, hindering ventilation fan protection; 2. The doors lack a securing mechanism. In the event of an explosion, the doors are swept away by the intense blast pressure, causing damage and deformation, making it difficult to quickly and promptly restore mine ventilation, leading to serious secondary disasters. During reverse wind operations, the bolts must be tightened individually manually, which is inconvenient and time-consuming, and generally fails to meet regulatory requirements in the event of an emergency.

[0004] In the existing technology, there is a multi-flap coal mine air shaft explosion-proof door (application number: 201821567249.0). This solution is based on the MFBL type vertical air shaft explosion-proof door. The conical door panel is divided equally to make a movable door panel, and a power device is added between the door panel and the weight device. At the same time, the return air device is changed to electrical control, so that the opening and closing of the door panel and the return air device can be remotely controlled. This solution is already a relatively good solution for air shaft explosion-proof doors, but there are still some shortcomings: 1. The multi-flap coal mine air shaft explosion-proof door is expensive; as the name suggests, the "multi-flap type" has a large number of movable door bodies; because it is a conical door body, it must be hinged to the bottom plate for flexible opening and closing, and the number is at least 4, and the weight device, weight lifting device, and anti-wind locking device corresponding to the movable door body are 1 to 2 times the number of movable door bodies. Although it is possible to build the MFBL type air shaft explosion-proof door without any major reconstruction or construction of the equipment foundation, the door body, seals, limit devices, weight devices, weight lifting devices, anti-wind locking devices, electrical control devices, etc. still require investment, and the more movable door bodies there are, the higher the production and maintenance costs required. 2. The sealing device between the multi-flap movable door bodies has a poor sealing effect; in order to achieve better pressure relief and convenient control, the multi-flap movable door bodies need to be opened and closed at the same time. However, due to the existence of errors and welding deformation in the production of the movable door bodies, a gap must be left between adjacent movable door bodies to ensure that the movable door bodies are flexible and unobstructed when opening and closing, which leads to poor sealing effect. Summary of the Invention

[0005] In order to solve the problems of high cost, poor sealing effect and low remote control reliability of existing scenic explosion-proof doors, we provide a double-leaf self-retracting vertical shaft explosion-proof door.

[0006] The technical solution adopted by the utility model is as follows: a split self - reset vertical shaft explosion - proof door, which consists of a foundation, a door frame, a movable door body, a hydraulic regulating weight device, a locking device, a buffer and limit device, a hydraulic station and a remote operation console; the foundation is in a square - frame shape, fixed on the wellhead ground, and set along the periphery of the original wellhead's circular foundation; the square - frame at the bottom of the door frame is fixed on the foundation, and the upper part is in a triangular prism shape, hollow inside, sealed at both ends, and there is a main beam support between the two ends; the driving parts, connecting parts and locking hooks of the locking device are fixedly installed at both ends of the door frame; the movable door body is a flat metal structure, with a rectangular or trapezoidal outer shape, and the number is 2, symmetrically installed on both sides of the door frame. A lock core is arranged on the side of the movable door body that contacts the sealed ends of the door frame, and the lock core cooperates with the locking hook of the locking device; the lower part of the movable door body is hinged to the square bottom of the door frame and can rotate around the hinge point to realize the function of connecting or blocking the gas in the shaft and the ground air; the upper part of the movable door body is connected to the hydraulic regulating weight device by a steel wire rope, and is softly connected to the buffer and limit device on the side facing the wellhead. A sealing gasket is arranged around the four sides of the movable door body on the side facing the wellhead, and the sealing gasket closely fits with the edge of the door frame when the movable door body is closed; the buffer and limit device is fixed at the bottom of the door frame; the hydraulic station is electrically connected to the remote operation console, and the hydraulic station is connected to the hydraulic cylinders of the hydraulic regulating weight device and the locking device through oil pipes to control the actions of multiple hydraulic cylinders. For the movable door body, the included angle between the two doors in the closed state is 90° - 160°; the number of the hydraulic regulating weight devices is 1 to 2 times the number of the movable door bodies, and is symmetrically arranged around the movable door bodies.

[0007] The beneficial effects of the utility model are as follows: The utility model uses 2 movable doors in cooperation with the door frame, the hydraulic regulating weight device, the locking device, the buffer and limit device, the hydraulic station and the remote operation console to achieve: 1. When the mine is ventilated normally, the air shaft wellhead is closed to establish a sealed ventilation duct; 2. When a gas explosion occurs underground, it opens for pressure relief to protect the mine ventilator; 3. After the explosion - proof door opens for pressure relief, it can immediately and quickly close the explosion - proof door to quickly rebuild the mine ventilation duct so as to restore mine ventilation; 4. When the mine ventilator fails and stops running, the explosion - proof door automatically opens to establish a natural ventilation channel; 5. During the mine air - reversal operation, the explosion - proof door can be remotely and quickly locked through the automatic control system and the actuator to establish a positive - pressure ventilation channel. The initial infrastructure construction of the utility model can be directly carried out around the circular foundation of the MFBL - type air shaft explosion - proof door without affecting the use of the original air shaft explosion - proof door. The door frame and the movable door body have a simple structure, are easy to install, have a short installation period, and do not affect the normal production of the coal mine. The utility model has a compact structure, a simple foundation, is easy to install and debug, has a high degree of mechanization and automation, good sealing effect, meets the requirements of the "Coal Mine Safety Regulations", and its popularization and application can produce good social and economic benefits. Brief Description of the Drawings

[0008] Appendix Figure 1This is a diagram of a double-leaf self-reversing vertical shaft explosion-proof door in the closed state.

[0009] Attachment Figure 2 This is a top view of a double-leaf, self-retracting vertical shaft explosion-proof door.

[0010] Attachment Figure 3 This is a diagram of the open state of a double-leaf self-recovering vertical shaft explosion-proof door.

[0011] Attachment Figure 4 This is the main view of the door frame of a double-leaf self-retracting vertical shaft explosion-proof door.

[0012] Attachment Figure 5 This is a top view of the door frame of a double-leaf self-retracting vertical shaft explosion-proof door.

[0013] Attachment Figure 6 This is the main view of the movable door body of a double-leaf self-reversing vertical shaft explosion-proof door.

[0014] Attachment Figure 7 It is a top view of the movable door body of a double-leaf self-reversing vertical shaft explosion-proof door.

[0015] Attachment Figure 8 The present invention is a structural diagram of a locking device for a double-leaf self-reversing vertical shaft explosion-proof door. DETAILED DESCRIPTION

[0016] The following are specific examples of the present invention, which will be further described in conjunction with the accompanying drawings.

[0017] like Figures 1 to 8As shown in the figure, a split self - reset vertical shaft explosion - proof door consists of a foundation 1, a door frame 2, a movable door body 3, a hydraulic adjustment weight device 4, a locking device 5, a buffer and limit device 6, a hydraulic station 7, and a remote operation console 8. The foundation 1 is in a square - frame shape and is fixed on the wellhead ground, established along the periphery of the original wellhead's circular foundation. The square - frame at the bottom of the door frame 2 is fixed on the foundation 1, and its upper part is in a triangular prism shape, hollow inside, sealed at both ends, and there is a main beam support between the two ends. The driving part 501, connecting part 502, and locking hook 503 of the locking device 5 are fixedly installed at both ends of the door frame 2. The movable door body 3 is a flat metal structure, with a rectangular or trapezoidal shape, and the number is 2, symmetrically installed on both sides of the door frame 2. A lock core is provided on the side of the movable door body 3 that contacts the sealed ends of the door frame 2, and the lock core cooperates with the locking hook 503 of the locking device 5. The lower part of the movable door body 3 is hinged to the square - shaped bottom of the door frame 2 and can rotate around the hinge point to realize the function of connecting or blocking the gas in the shaft and the ground air. The upper part of the movable door body 3 is connected to the hydraulic adjustment weight device 4 by a steel wire rope and is softly connected to the buffer and limit device 6 on the side facing the wellhead. A sealing gasket is provided around the four sides of the movable door body 3 on the side facing the wellhead. When the movable door body 3 is closed, the sealing gasket closely fits with the edge of the door frame 2. The buffer and limit device 6 is fixed at the bottom of the door frame 2. The hydraulic station 7 is electrically connected to the remote operation console 8, and the hydraulic station 7 is connected to the hydraulic cylinders of the hydraulic adjustment weight device 4 and the locking device 5 through oil pipes to control the actions of multiple hydraulic cylinders. For the movable door body 3, the included angle between the two doors in the closed state is 90° - 160°. The number of the hydraulic adjustment weight devices 4 is 1 to 2 times the number of the movable door bodies 3, and they are symmetrically arranged around the movable door bodies 3.

[0018] Working process: Under the normal ventilation state of the mine, the movable door body 3 is closely attached to the door frame 2 under the action of its own weight and the negative pressure of the gas in the shaft. A rubber sealing ring is installed between the movable door body 3 and the door frame 2 to isolate the air inside and outside the shaft, establish a sealed ventilation duct, and ensure the normal operation of the mine ventilation system. When a gas explosion occurs underground, the movable door body 3 rotates and opens around the hinge point under the action of the gas shock wave in the shaft, connecting the air inside and outside the shaft, and the explosion shock wave is discharged from the wellhead for pressure relief, thus protecting the mine ventilation fan. The opening angle and speed of the movable door body 3 are limited by the buffer and limit device 6. After the explosion - proof door opens for pressure relief, the remote operation console 8 immediately sends an electrical signal to the hydraulic station 7 to control the hydraulic cylinder of the hydraulic adjustment weight device 4 to lift the weight, and the movable door body 3 closes under the action of its own weight to rebuild the mine ventilation duct. When the mine ventilation fan fails and stops running, the pressure difference between the inside and outside of the shaft becomes zero, and the movable door body 3 automatically opens under the action of the weight to establish a natural ventilation channel. During the mine air - reversal operation, the operator sends an electrical signal to the hydraulic station 7 through the remote operation console 8 to control the action of the hydraulic cylinder of the locking device 5,带动锁钩503旋转,压紧活动门体3两侧的锁芯,迅速地将活动门体3锁住,建立正压通风通道。 It should be noted that there is an unclear part in the original text of item [ID = 3] "带动锁钩503旋转,压紧活动门体3两侧的锁芯,迅速地将活动门体3锁住,建立正压通风通道。", the part "带动锁钩503旋转" seems to be incomplete in the Chinese expression. I translated it as best as I could based on the context. If you can provide more accurate information, the translation can be further optimized.

Claims

1. A split self - resetting vertical shaft explosion - proof door, which consists of a foundation (1), a door frame (2), a movable door body (3), a hydraulic regulating weight device (4), a locking device (5), a buffer limiting device (6), a hydraulic station (7), and a remote operation console (8); the foundation (1) is in a square - frame shape, fixed on the well - head ground, and set along the periphery of the original well - head's circular foundation; the square - frame at the bottom of the door frame (2) is fixed on the foundation (1), the upper part is in a triangular prism shape, hollow inside, sealed at both ends, and there is a main beam support between the two ends; driving parts (501), connecting parts (502), and locking hooks (503) of the locking device (5) are fixedly installed at both ends of the door frame (2); the movable door body (3) is a flat metal structure, with a rectangular or trapezoidal outer shape, and the number is 2, symmetrically installed on both sides of the door frame (2). A lock core is arranged on the side edge of the movable door body (3) contacting the sealed ends of the door frame (2), and the lock core cooperates with the locking hook (503) of the locking device (5); the lower part of the movable door body (3) is hinged to the square - shaped bottom of the door frame (2) and can rotate around the hinge point to achieve the function of connecting or blocking the gas in the shaft and the ground air; the upper part of the movable door body (3) is connected to the hydraulic regulating weight device (4) by a steel wire rope, and is softly connected to the buffer limiting device (6) on the side facing the well - head. A sealing gasket is arranged around the four sides of the movable door body (3) on the side facing the well - head, and when the movable door body (3) is in the closed state, the sealing gasket closely adheres to the edge of the door frame (2); the buffer limiting device (6) is fixed at the bottom of the door frame (2); the hydraulic station (7) is connected to the hydraulic cylinders of the hydraulic regulating weight device (4) and the locking device (5) through oil pipes to control the actions of multiple hydraulic cylinders. The hydraulic station (7) is electrically connected to the remote operation console (8).

2. The self-closing vertical shaft explosion-proof door according to claim 1, characterized in that: For the movable door body (3), the included angle between the two doors in the closed state is 90° - 160°.

3. The self-closing vertical shaft explosion-proof door according to claim 1, characterized in that: The number of the hydraulic regulating weight devices (4) is 1 to 2 times the number of the movable door bodies (3), and they are symmetrically arranged around the movable door bodies (3).

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