A construction method for safely replacing the explosion-proof door of a coal mine

Abstract

The present application discloses a construction method for safely replacing the explosion-proof door of a coal mine, which comprises the following steps: S1, installing the foundation of the new explosion-proof door; S2, installing the embedded roof plate and the embedded bottom plate; S3, installing the wedge-shaped door posts; S4, installing the buffer device; S5, installing the door frame assembly; S6, installing the air-reversing locking device; S7, installing and debugging the electric control system until it operates normally; S8, conducting multiple tests and detecting whether the new explosion-proof door operates normally. If it can operate normally, the traditional explosion-proof door is removed. The present application has the effect of facilitating the replacement of the explosion-proof door.

Description

Technical Field

[0001] The present application relates to the technical field of coal mine ventilation equipment, and in particular to a construction method for safely replacing the explosion-proof door of a coal mine. Background Art

[0002] After integration, there are still more than 5,000 coal mines in China. Most of the ventilation inclined shafts or adits of these coal mines are equipped with traditional explosion-proof doors. The traditional explosion-proof doors do not have the functions of impact resistance and automatic reset. In case of a gas or coal dust explosion underground, the traditional explosion-proof doors will be blown away or severely deformed by the shock wave, resulting in ventilation short circuit, which will pose a threat to the life safety of underground survivors and also affect the timely development of rescue work. The replacement of traditional explosion-proof doors is imminent.

[0003] Figure 1 It is a schematic diagram of the ventilation structure of a mine roadway. A traditional explosion-proof door foundation is installed outside the mine roadway. A traditional explosion-proof door is installed inside the traditional explosion-proof door foundation, which is usually used to seal the mine roadway and vent the explosion when an explosion occurs underground to protect the fan from being damaged. The side wall of the mine roadway close to the outside is connected to an exhaust passage, and a fan is installed in the exhaust passage. The fan is used to discharge the gas in the mine roadway on the premise that the traditional explosion-proof door is closed.

[0004] During the process of removing the traditional explosion-proof door, it is necessary to keep the fan working to facilitate the ventilation of the mine roadway. However, after the traditional explosion-proof door is removed, it is easy to cause a short circuit in the air duct in the mine roadway, and the fan is difficult to discharge the air in the mine roadway, which will also pose a threat to the life safety of the personnel working underground.

[0005] Stopping ventilation and production to replace the explosion-proof door will not only cause huge economic losses but also pose safety hazards. Therefore, there is an urgent need for a construction method for safely replacing the explosion-proof door of a coal mine ventilation inclined shaft or adit without stopping ventilation and production. Summary of the Invention

[0006] The present application provides a construction method for safely replacing a coal mine explosion-proof door, which has the effect of facilitating the replacement of the explosion-proof door.

[0007] A construction method for safely replacing a coal mine explosion-proof door provided by the present application adopts the following technical solutions:

[0008] A construction method for safely replacing a coal mine explosion-proof door includes the following steps:

[0009] S1. Install a new explosion-proof door foundation, close the traditional explosion-proof door, install a new explosion-proof door foundation at one end of the traditional explosion-proof door foundation close to the outside of the mine roadway, and connect the new explosion-proof door foundation and the traditional explosion-proof door foundation into one body;

[0010] S2. Install the embedded top plate and the embedded bottom plate. Install the embedded top plate and the embedded bottom plate on the foundation of the new explosion-proof door, connect the embedded top plate, the embedded bottom plate and the steel mesh into one body, and install a backing plate on the foundation of the new explosion-proof door;

[0011] [[ID=Z3]]S3. Install the wedge-shaped door post. Install a reset device and a synchronous rotating shaft device on the wedge-shaped door post, and then install the wedge-shaped door post on the backing plate;

[0012] S4. Install a buffer device. Install a gas buffer, an elastic buffer and an elastoplastic buffer on the left door leaf assembly and the right door leaf assembly, and connect the left door leaf assembly and the right door leaf assembly to the synchronous rotating shaft device;

[0013] S5. Install the door frame assembly. Install the door frame assembly on the outer end face of the foundation of the new explosion-proof door, and fixedly connect the door frame assembly to the wedge-shaped door post;

[0014] S6. Install an air reversal locking device. Install the air reversal locking device on both sides of the door frame assembly;

[0015] S7. Install and debug the electric control system to the normal operation state;

[0016] S8. Conduct multiple tests and detect whether the new explosion-proof door operates normally. If it can operate normally, remove the traditional explosion-proof door.

[0017] By adopting the above technical solution, when a new explosion-proof door needs to be installed, the operator first closes the traditional explosion-proof door. Without removing the traditional explosion-proof door, the foundation of the new explosion-proof door is directly installed on the foundation of the traditional explosion-proof door, which not only reduces the probability of ventilation short-circuit in the mine roadway, but also reduces the workload of removing the foundation of the traditional explosion-proof door, greatly improving the installation efficiency and safety performance, and thus facilitating the replacement of the explosion-proof door.

[0018] Preferably, the synchronous rotating shaft device includes a first connecting seat, a second connecting seat, a first gear and a second gear. The first connecting seat is rotatably connected to the left end face of the wedge-shaped door post and is close to the outside of the mine roadway, and one end of the first connecting seat is fixedly connected to the side wall of the left door leaf assembly. The second connecting seat is rotatably connected to the right end face of the wedge-shaped door post and is close to the outside of the mine roadway, and one end of the second connecting seat is fixedly connected to the side wall of the right door leaf assembly. The first gear is coaxially and fixedly connected to the first connecting seat, the second gear is coaxially and fixedly connected to the second connecting seat, and the first gear meshes with the second gear.

[0019] By adopting the above technical solution, the left door leaf assembly rotates to drive the first connecting seat to rotate, the first connecting seat rotates to drive the first gear to rotate, the first gear rotates to drive the second gear to rotate, the second gear rotates to drive the second connecting seat to rotate, and the second connecting seat rotates to drive the right door leaf assembly to rotate, so as to be able to drive the left door leaf assembly and the right door leaf assembly to rotate synchronously. That is, the rotation of any one door leaf can drive the synchronous rotation of the other door leaf, thereby improving the control efficiency of the door leaf. In particular, when an explosion occurs underground, the left door leaf assembly and the right door leaf assembly are pushed open by the shock wave, and the synchronous rotation causes the gas buffer, elastic buffer and elastoplastic buffer installed on the left door leaf assembly and the right door leaf assembly to collide with the predetermined collision position, or the gas buffer, elastic buffer and elastoplastic buffer collide in a predetermined order from small to large in terms of collision force, so as to minimize the impact and fully absorb energy, and protect the left door leaf assembly and the right door leaf assembly from being damaged.

[0020] Preferably, counterweight devices are installed on both sides of the foundation of the new explosion-proof door. The counterweight device includes a vertically arranged lifting column, a first vertical fixed pulley installed at the top of the lifting column, a counterweight block sliding vertically along the lifting column, and a first steel wire rope for connecting the counterweight block and the left door leaf assembly and the right door leaf assembly; one end of the first steel wire rope on the left side is fixedly connected to the bottom of the left door leaf assembly, the other end is wound around the first vertical fixed pulley on the left side and fixedly connected to the left counterweight block, one end of the first steel wire rope on the right side is fixedly connected to the bottom of the right door leaf assembly, and the other end is wound around the first vertical fixed pulley on the right side and fixedly connected to the right counterweight block.

[0021] By adopting the above technical solution, when the fan stops working, the counterweight block pulls the first steel wire rope to move, thereby pulling the left door leaf assembly and the right door leaf assembly to rotate towards the outside of the mine roadway, facilitating the left door leaf assembly and the right door leaf assembly to be in an open state, and further facilitating ventilation in the mine roadway; when the fan is working, the inside of the mine roadway is in a negative pressure state, so that the left door leaf assembly and the right door leaf assembly can be automatically closed.

[0022] Preferably, upper pull rod assemblies are hinged on both sides of the upper end of the wedge-shaped door post, the other end of each upper pull rod assembly is hinged to the embedded roof slab, lower pull rod assemblies are hinged on both sides of the lower end of the wedge-shaped door post, and the other end of the lower pull rod assembly is hinged to the embedded floor slab.

[0023] By adopting the above technical solution, the setting of the upper pull rod assembly and the lower pull rod assembly facilitates the formation of a traction force on the wedge-shaped door post, and reduces the probability of the wedge-shaped door post being flushed out by the airflow when an explosion occurs inside the mine roadway.

[0024] Preferably, the lengths of the upper pull rod assembly and the lower pull rod assembly can be adjusted and fixed.

[0025] By adopting the above technical solution, during the installation process of the wedge-shaped door post, it can be adjusted through the upper pull rod assembly and the lower pull rod assembly, improving the installation efficiency and effectively adjusting the installation error.

[0026] Preferably, a manual control assembly is further installed on the outer side of the new explosion-proof door foundation close to the mine roadway. There are two groups of manual control assemblies. Each group of manual control assemblies includes a manual winch, a second steel wire rope, and a second horizontal fixed pulley. The second horizontal fixed pulley is installed between the manual winch and the left door leaf assembly and the right door leaf assembly. One end of the second steel wire rope on the left side is fixedly connected to the bottom of the left door leaf assembly, and the other end is wound around the second horizontal fixed pulley on the left side and fixedly connected to the left manual winch. One end of the second steel wire rope on the right side is fixedly connected to the bottom of the right door leaf assembly, and the other end is wound around the second horizontal fixed pulley on the right side and fixedly connected to the right manual winch.

[0027] By adopting the above technical solution, when a vehicle or goods needs to pass through the new explosion-proof door, the operator can drive the second steel wire rope to move by rotating the manual winch, thereby driving the left door leaf assembly and the right door leaf assembly to move. Through manual adjustment, the opening and closing sizes of the left door leaf assembly and the right door leaf assembly can be made more in line with the actual requirements, facilitating the passage of vehicles or goods.

[0028] Preferably, a second vertical fixed pulley is installed on the side wall of each lifting column close to the door frame assembly; a first horizontal fixed pulley is arranged on one side of the second horizontal fixed pulley close to the lifting column. One end of the first steel wire rope on the left side away from the lifting column is sequentially wound around the second vertical fixed pulley and the first horizontal fixed pulley on the left side and fixedly connected to the bottom of the left door leaf assembly. One end of the first steel wire rope on the right side away from the lifting column is sequentially wound around the second vertical fixed pulley and the first horizontal fixed pulley on the right side and fixedly connected to the bottom of the right door leaf assembly.

[0029] By adopting the above technical solution, the setting of the first horizontal fixed pulley and the second vertical fixed pulley facilitates the smoother movement of the first steel wire rope.

[0030] Preferably, the center height of the rope groove at the lower end of the second vertical fixed pulley is the same as the center height of the rope groove of the first horizontal fixed pulley.

[0031] By adopting the above technical solution, the center height of the rope groove at the lower end of the second vertical fixed pulley is the same as the center height of the rope groove of the first horizontal fixed pulley, facilitating the first steel wire rope located below the left door leaf assembly and the right door leaf assembly to be in a horizontal state, thereby facilitating the left door leaf assembly and the right door leaf assembly to rotate more smoothly.

[0032] Preferably, the reverse air locking device includes a mounting base installed on the side wall of the door frame assembly close to the outer side wall of the mine roadway. An electric cylinder is hinged to the top surface of the mounting base. The piston rod end of the electric cylinder is hinged to a first connecting rod. The first connecting rod extends towards the middle of the door frame assembly. The end of the first connecting rod away from the electric cylinder is hinged to the side wall of the door frame assembly close to the outer side of the mine roadway, and a first pressing block is provided. The first pressing block is arranged to incline upwards. A transmission rod extending upwards is hinged to the middle of the first connecting rod. The end of the transmission rod away from the first connecting rod is hinged to a second connecting rod. The second connecting rod extends towards the middle of the door frame assembly. The end of the second connecting rod away from the transmission rod is hinged to the side wall of the door frame assembly close to the outer side of the mine roadway, and a second pressing block is provided. The second pressing block is arranged to incline upwards.

[0033] By adopting the above technical solution, when a reverse air test is required, the left door leaf assembly and the right door leaf assembly can be easily locked on the door frame assembly through the reverse air locking device. External air is blown into the mine roadway through the fan. Under the action of the reverse air locking device, the left door leaf assembly and the right door leaf assembly can be kept in a closed state all the time, thereby improving the sealing performance of the new explosion-proof door and further reducing the probability of the air blown in from the outside flowing out of the new explosion-proof door.

[0034] Preferably, first pads and second pads are arranged on the sides of the left door leaf assembly and the right door leaf assembly close to the outer side of the mine roadway. The first pads are arranged in cooperation with the first pressing blocks, and the second pads are arranged in cooperation with the second pressing blocks.

[0035] By adopting the above technical solution, during the reverse air test, the first pressing block rotates to abut against the first pad, and the second pressing block rotates to abut against the second pad, thereby facilitating the left door leaf assembly and the right door leaf assembly to be tightly abutted against the door frame assembly, and further improving the sealing performance of the left door leaf assembly and the right door leaf assembly.

[0036] In summary, the present application has the following beneficial effects:

[0037] 1. When installing a new explosion-proof door, the operator first closes the traditional explosion-proof door. Without removing the traditional explosion-proof door foundation, the new explosion-proof door foundation can be directly installed on the traditional explosion-proof door foundation, which not only reduces the probability of ventilation short-circuit in the mine roadway, but also reduces the workload of removing the traditional explosion-proof door foundation, greatly improving the installation efficiency and safety performance, and further facilitating the replacement of the explosion-proof door;

[0038] 2. When a vehicle or an operator needs to pass through the new explosion-proof door, the operator can drive the second steel wire rope to move by rotating the manual winch, thereby driving the left door leaf assembly and the right door leaf assembly to rotate. Through manual adjustment, the opening and closing sizes of the left door leaf assembly and the right door leaf assembly can be made more in line with the actual requirements, thus facilitating the passage of vehicles or goods. Brief Description of the Drawings

[0039] Figure 1 is a schematic diagram of the ventilation structure of the mine roadway.

[0040] Figure 2 is a schematic diagram of the installation steps of the embodiment of the present application.

[0041] Figure 3 is a schematic diagram of the installation structure of the new explosion-proof door foundation of the embodiment of the present application.

[0042] Figure 4 is a left view of the new explosion-proof door after installation of the embodiment of the present application.

[0043] Figure 5 is a front view of the new explosion-proof door after installation of the embodiment of the present application.

[0044] Figure 6 is Figure 5 a partial enlarged view of part A in

[0045] Figure 7 is a diagram showing five states of the left door leaf assembly and the right door leaf assembly of the embodiment of the present application.

[0046] Figure 8 is a schematic diagram of the structure of the air reversal locking device of the embodiment of the present application.

[0047] Description of the attached drawing reference numerals: 1, mine roadway; 2, exhaust air passage; 3, fan; 4, traditional explosion-proof door foundation; 5, traditional explosion-proof door; 6, new explosion-proof door foundation; 7, new explosion-proof door; 8, planted steel bars; 9, embedded roof; 10, embedded floor; 11, counterweight foundation; 12, anchor bolt; 13, upper pin shaft 1; 14, upper pull rod assembly; 15, split pin; 16, upper pin shaft 2; 17, door frame assembly; 18, wedge-shaped door post; 19, left door leaf assembly; 20, lower pin shaft 1; 21, lower pull rod assembly; 22, lower pin shaft 2; 23, counterweight device; 231, lifting column; 232, first vertical fixed pulley; 233, second vertical fixed pulley; 234, counterweight block; 235, first steel wire rope; 236, first fastening bolt; 24, reverse air locking device; 241, mounting seat; 242, electric cylinder; 243, first connecting rod; 244, first pressing block; 245, transmission rod; 246, second connecting rod; 247, second pressing block; 248, first cushion block; 249, second cushion block; 26, synchronous rotating shaft device; 261, first rotating shaft; 262, second rotating shaft; 263, first connecting seat; 264, second connecting seat; 265, first gear; 266, second gear; 27, gas buffer; 28, elastic buffer; 29, elastoplastic buffer; 30, right door leaf assembly; 31, backing plate; 32, first horizontal fixed pulley; 41, manual control component; 411, manual winch; 412, second horizontal fixed pulley; 413, second steel wire rope; 414, second fastening bolt; 51, reset device; 511, torsion spring; 512, first core shaft; 513, second core shaft; 61, rotating seat. Detailed implementation manners

[0048] This application discloses a construction method for safely replacing a coal mine explosion-proof door. Referring to Figure 2 , the method includes the following steps:

[0049] S1. In combination with Figure 3 , install the new explosion-proof door foundation 6. First, close the traditional explosion-proof door 5. Install the new explosion-proof door foundation 6 at one end of the traditional explosion-proof door foundation 4 close to the outside of the mine roadway 1, and connect the new explosion-proof door foundation 6 with the traditional explosion-proof door foundation 4 into one body through planted steel bars 8; install counterweight foundations 11 at both ends of the new explosion-proof door foundation 6 close to the outside of the mine roadway 1.

[0050] S2. In combination with Figure 3 and Figure 4, install the embedded top plate 9 and the embedded bottom plate 10. Install the embedded top plate 9 on the top plate of the new explosion-proof door foundation 6, and install the embedded bottom plate 10 on the foundation of the new explosion-proof door foundation 6. Before grouting the new explosion-proof door foundation 6, after installing the embedded top plate 9 and the embedded bottom plate 10 in the designated positions, connect them to the steel mesh as a whole. Install the backing plate 31 on the foundation of the new explosion-proof door foundation 6, and adjust the backing plate 31 to the design elevation; after leveling and aligning, fix the backing plate 31 on the foundation of the new explosion-proof door foundation 6 through the anchor bolts 12. At the same time, make the bottom surface of the backing plate 31 abut tightly against the foundation of the new explosion-proof door foundation 6.

[0051] S3. Combine Figure 4 and Figure 5 , install the wedge-shaped door post 18. First, install the reset device 51 and the synchronous rotating shaft device 26 on the wedge-shaped door post 18 through bolts. Then, connect the upper tie rod assembly 14 to the upper ends on both sides of the wedge-shaped door post 18 through the split pin 15 and the upper pin two 16 by hinge. Connect the lower tie rod assembly 21 to the lower ends on both sides of the wedge-shaped door post 18 through the split pin 15 and the lower pin two 22 by hinge. The lengths of the upper tie rod assembly 14 and the lower tie rod assembly 21 can be adjusted and locked. Use a crane to lift the wedge-shaped door post 18 onto the backing plate 31, level it with the bevel pad and adjust the wedge-shaped door post 18 to the design elevation. After centering left and right, fix the wedge-shaped door post 18 on the backing plate 31 with bolts. Adjust the length of the upper tie rod assembly 14, and connect the end of the upper tie rod assembly 14 far from the upper pin two 16 to the lower end of the embedded top plate 9 through the split pin 15 and the upper pin one 13, and lock and fix the length of the upper tie rod assembly 14. Then adjust the length of the lower tie rod assembly 21, and connect the end of the lower tie rod assembly 21 far from the lower pin two 22 to the upper end of the embedded bottom plate 10 through the split pin 15 and the lower pin one 20, and lock and fix the length of the lower tie rod assembly 21. There are two groups of the upper tie rod assembly 14, which are located on the left and right sides of the wedge-shaped door post 18. There are four groups of the lower tie rod assembly 21, two groups of the lower tie rod assembly 21 are located on the left side of the wedge-shaped door post 18, and the other two groups of the lower tie rod assembly 21 are located on the right side of the wedge-shaped door post 18.

[0052] S4. Combine Figure 5 , install the buffer device. Install the gas buffer 27, the elastic buffer 28 and the elastoplastic buffer 29 on the side walls close to the outside of the mine roadway 1 of the left door leaf assembly 19 and the right door leaf assembly 30. Install the left door leaf assembly 19 on the left side close to the outside of the mine roadway 1 of the wedge-shaped door post 18, install the right door leaf assembly 30 on the right side close to the outside of the mine roadway 1 of the wedge-shaped door post 18, and connect the left door leaf assembly 19 and the right door leaf assembly 30 to the synchronous rotating shaft device 26 through bolts and keys, so that the left door leaf assembly 19 and the right door leaf assembly 30 can rotate around the rotation center of the synchronous rotating shaft device 26.

[0053] S5. CombineFigure 5 , install the door frame assembly 17. Install the door frame assembly 17 on the outer end face of the new explosion-proof door foundation 6 through expansion bolts or anchor bolts, and connect the door frame assembly 17 and the wedge-shaped door post 18 by bolts; install the counterweight device 23 on the counterweight foundation 11 by bolts.

[0054] S6. Combine Figure 5 , install the air-reversing locking device 24. Install the air-reversing locking device 24 on both sides of the door frame assembly 17.

[0055] S7. Install and debug the electric control system to the normal operation state. The electric control system includes a PLC controller.

[0056] S8. Close the new explosion-proof door 7, open the traditional explosion-proof door 5, and test and detect whether the new explosion-proof door 7 operates normally for multiple times. If it can operate normally, remove the traditional explosion-proof door 5.

[0057] Refer to Figure 5 and Figure 6 , the synchronous rotating shaft device 26 includes a first rotating shaft 261, a second rotating shaft 262, a first connecting seat 263, a second connecting seat 264, a first gear 265 and a second gear 266, and is used to make the left door leaf assembly 19 and the right door leaf assembly 30 rotate synchronously. The first rotating shaft 261 and the second rotating shaft 262 are both rotatably connected to one end of the wedge-shaped door post 18 close to the outside of the mine roadway 1 through bearing seats. The first rotating shaft 261 is located on the left side of the wedge-shaped door post 18, and the second rotating shaft 262 is located on the right side of the wedge-shaped door post 18. The first connecting seat 263 is sleeved and fixed on the outer circumferential surface of the first rotating shaft 261 through a positioning pin, and one end of the first connecting seat 263 is fixedly connected to the side wall of the left door leaf assembly 19. The second connecting seat 264 is sleeved and fixed on the outer circumferential surface of the second rotating shaft 262 through a positioning pin, and one end of the second connecting seat 264 is fixedly connected to the side wall of the right door leaf assembly 30. The first gear 265 is sleeved and fixed on the first rotating shaft 261 through a key, the second gear 266 is sleeved and fixed on the second rotating shaft 262 through a key, and the first gear 265 meshes with the second gear 266.

[0058] Refer to Figure 5 and Figure 6, the reset device 51 includes a torsion spring 511, a first mandrel 512, a second mandrel 513 and a torsion spring seat 514. The torsion spring seat 514 is fixed to the outer surface of the wedge-shaped door post 18 by bolts. The first mandrel 512 and the second mandrel 513 are respectively rotatably connected to the left and right end shaft holes of the torsion spring seat 514 and are axially positioned. The first mandrel 512 is located on the left side of the wedge-shaped door post 18, and the second mandrel 513 is located on the right side of the wedge-shaped door post 18. The torsion spring 511 on the left side is sleeved on the outer periphery of the first mandrel 512, one end is pressed against the middle of the torsion spring seat 514, and the other end is tightly connected to the side wall of the left door leaf assembly 19 and can slide relatively. The torsion spring 511 on the right side is sleeved on the outer periphery of the second mandrel 513, one end is pressed against the middle of the torsion spring seat 514, and the other end is tightly connected to the side wall of the right door leaf assembly 30. When both the left door leaf assembly 19 and the right door leaf assembly 30 are in the open state, the torsion spring 511 is in a stressed state. When the fan 3 operates to generate a negative pressure suction force and drives the left door leaf assembly 19 and the right door leaf assembly 30 to start closing, the torsion spring 511 deforms to restore its shape, facilitating the pushing of the left door leaf assembly 19 and the right door leaf assembly 30 to close.

[0059] Refer to Figure 5 and Figure 7 , both the bottom of the left door leaf assembly 19 and the right door leaf assembly 30 are provided with a first fastening bolt 236 and a second fastening bolt 414. The first fastening bolt 236 and the second fastening bolt 414 are both located at positions where the left door leaf assembly 19 and the right door leaf assembly 30 are far away from each other. Specifically, the first fastening bolt 236 is located on the side of the second fastening bolt 414 close to the door frame assembly 17.

[0060] Refer to Figure 5 and Figure 7 , there are two sets of counterweight devices 23. One set is located on the left side of the door frame assembly 17, and the other set is located on the right side of the door frame assembly 17. The counterweight device 23 includes a lifting column 231, a first vertical fixed pulley 232, a second vertical fixed pulley 233, a first horizontal fixed pulley 32, a counterweight 234 and a first steel wire rope 235, which are used to pull open the left door leaf assembly 19 and the right door leaf assembly 30 when the fan 3 stops working, so as to keep the mine roadway 1 ventilated. The lifting column 231 is vertically arranged, and the bottom end of the lifting column 231 is fixedly connected to the upper surface of the counterweight foundation 11 by bolts. The counterweight 234 slides vertically on the lifting column 231. The first vertical fixed pulley 232 is rotatably connected to the top end of the lifting column 231. The second vertical fixed pulley 233 is rotatably connected to the bottom end of the lifting column 231 and is located on the side close to the door frame assembly 17. The first horizontal fixed pulley 32 is installed on the foundation of the new explosion-proof door foundation 6 through a rotating seat 61. The rotating seat 61 is fixed to the foundation of the new explosion-proof door foundation 6 by anchor bolts. The first horizontal fixed pulley 32 is located at the middle position between the left door leaf assembly 19 and the right door leaf assembly 30.

[0061] Refer toFigure 5 and Figure 7 , one end of the first wire rope 235 on the left side is fixedly connected to the top wall of the counterweight 234 on the left side, and the other end sequentially winds around the first vertical fixed pulley 232, the second vertical fixed pulley 233, and the first horizontal fixed pulley 32 on the left side and is detachably connected to the first fastening bolt 236. For example, in a bolting manner, or a through hole is provided on the first fastening bolt 236, and while tightening the first fastening bolt 236, the other end of the first wire rope 235 on the left side is fixed between the first fastening bolt 236 and the bottom surface of the left door leaf assembly 19. Similarly, one end of the first wire rope 235 on the right side is fixedly connected to the top wall of the counterweight 234 on the right side, and the other end sequentially winds around the first vertical fixed pulley 232, the second vertical fixed pulley 233, and the first horizontal fixed pulley 32 on the right side and is detachably connected to the first fastening bolt 236. The center of the rope groove of the first horizontal fixed pulley 32 and the center of the rope groove at the lower end of the second vertical fixed pulley 233 are at the same height, so as to facilitate the two first wire ropes 235 to be at the same horizontal plane at the position below the left door leaf assembly 19 or the right door leaf assembly 30.

[0062] Refer to Figure 7 , a manual control component 41 is further installed near the outer side of the new explosion-proof door foundation 6 close to the mine roadway 1. There are two groups of manual control components 41. Each group of manual control components 41 includes a manual winch 411, a second wire rope 413, and a second horizontal fixed pulley 412. The second horizontal fixed pulley 412 is installed between the manual winch 411 and the left door leaf assembly 19 and the right door leaf assembly 30. One end of the second wire rope 413 on the left side is detachably connected to the second fastening bolt 414 on the left side, and the other end winds around the second horizontal fixed pulley 412 on the left side and is fixedly connected to the manual winch 411 on the left side. One end of the second wire rope 413 on the right side is detachably connected to the second fastening bolt 414 on the right side, and the other end winds around the second horizontal fixed pulley 412 on the right side and is fixedly connected to the manual winch 411 on the right side. When it is necessary to open the left door leaf assembly 19 and the right door leaf assembly 30 at a larger angle, the operator can adjust through the manual winch 411, so as to facilitate the passage of vehicles or goods.

[0063] Refer to Figure 5 and Figure 8, there are two sets of reverse air locking devices 24. One set is located on the left side of the left door leaf assembly 19, and the other set is located on the right side of the right door leaf assembly 30, used to lock the left door leaf assembly 19 and the right door leaf assembly 30, thereby improving the sealing performance of the new explosion-proof door 7. In this embodiment, the reverse air locking device 24 on the left side is taken as an example, and the reverse air locking device 24 on the right side is the same. The reverse air locking device 24 includes a mounting base 241. The mounting base 241 is installed on the left side of the door frame assembly 17. The top surface of the mounting base 241 is hinged with an electric cylinder 242. The piston rod end of the electric cylinder 242 is hinged with a first connecting rod 243. The first connecting rod 243 extends towards the middle of the door frame assembly 17. The end of the first connecting rod 243 away from the electric cylinder 242 is hinged to the side wall of the door frame assembly 17 close to the outside of the mine roadway 1, and is provided with a first pressing block 244. The first pressing block 244 is inclined upwards.

[0064] A transmission rod 245 extending upwards is hinged to the middle of the first connecting rod 243. The end of the transmission rod 245 away from the first connecting rod 243 is hinged with a second connecting rod 246. The second connecting rod 246 extends towards the middle of the door frame assembly 17. The end of the second connecting rod 246 away from the transmission rod 245 is hinged to the side wall of the door frame assembly 17 close to the outside of the mine roadway 1, and is provided with a second pressing block 247. The second pressing block 247 is inclined upwards. The side walls of the left door leaf assembly 19 and the right door leaf assembly 30 close to the outside of the mine roadway 1 are both provided with a first cushion block 248 and a second cushion block 249. The first cushion block 248 is arranged in cooperation with the first pressing block 244, and the second cushion block 249 is arranged in cooperation with the second pressing block 247.

[0065] When a reverse air test is required, the electric control system controls the electric cylinder 242 to work. The piston rod of the electric cylinder 242 pushes the first connecting rod 243 to rotate towards the upper left. The first connecting rod 243 rotates upwards and pushes the first pressing block 244 to rotate downwards until the first pressing block 244 abuts against the first cushion block 248. At the same time, the first connecting rod 243 rotates upwards and pushes the transmission rod 245 to move upwards, thereby pushing the second connecting rod 246 to rotate. The second connecting rod 246 rotates and pushes the second pressing block 247 to rotate downwards until the second pressing block 247 abuts against the second cushion block 249, so that the left door leaf assembly 19 is locked on the door frame assembly 17. The locking of the right door leaf assembly 30 is the same and will not be elaborated here. Then the electric control system controls the fan 3 to work, blowing external air into the mine roadway 1, so that the underground air flow direction is reversed, and the toxic gas is discharged in the controlled direction.

[0066] When an explosion occurs in the mine roadway 1, the shock wave generated by the explosion impacts the left door leaf assembly 19 and the right door leaf assembly 30, causing the left door leaf assembly 19 and the right door leaf assembly 30 to open. When the left door leaf assembly 19 and the right door leaf assembly 30 collide, the gas buffer 27, the elastic buffer 28, and the elastoplastic buffer 29 can buffer, thereby protecting the left door leaf assembly 19 and the right door leaf assembly 30.

[0067] The implementation principle of the embodiment of the present application is as follows: When a new explosion-proof door 7 needs to be installed, the operator first closes the traditional explosion-proof door 5. Without demolishing the traditional explosion-proof door 5, the new explosion-proof door foundation 6 is directly installed on the traditional explosion-proof door foundation 6, which not only reduces the probability of ventilation short-circuit in the mine roadway 1 but also reduces the workload of demolishing the traditional explosion-proof door foundation 6, greatly improving the installation efficiency and safety performance.

[0068] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A construction method for safely replacing the explosion-proof door of a coal mine, characterized in that, It includes the following steps: S1. Install the new explosion-proof door foundation (6), close the traditional explosion-proof door (5), install the new explosion-proof door foundation (6) at one end of the traditional explosion-proof door foundation (4) close to the outside of the mine roadway (1), and connect the new explosion-proof door foundation (6) and the traditional explosion-proof door foundation (4) into one body; S2. Install the embedded roof (9) and the embedded floor (10), install the embedded roof (9) and the embedded floor (10) on the new explosion-proof door foundation (6), connect the embedded roof (9), the embedded floor (10) and the steel mesh into one body, and install the backing plate (31) on the new explosion-proof door foundation (6); S3. Install the wedge-shaped door post (18), install the reset device (51) and the synchronous rotating shaft device (26) on the wedge-shaped door post (18), and then install the wedge-shaped door post (18) on the backing plate (31); S4. Install the buffer device, install the gas buffer (27), the elastic buffer (28) and the elastoplastic buffer (29) on the left door leaf assembly (19) and the right door leaf assembly (30), and connect the left door leaf assembly (19) and the right door leaf assembly (30) with the synchronous rotating shaft device (26); S5. Install the door frame assembly (17), install the door frame assembly (17) on the outer end face of the new explosion-proof door foundation (6), and fixedly connect the door frame assembly (17) and the wedge-shaped door post (18); S6. Install the air-reversing locking device (24), and install the air-reversing locking device (24) on both sides of the door frame assembly (17); S7. Install and debug the electric control system to the normal operation state; S8. Test and detect the new explosion-proof door (7) for normal operation multiple times. If it can operate normally, remove the traditional explosion-proof door (5).

2. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 1, characterized in that: The synchronous rotating shaft device (26) includes a first connecting seat (263), a second connecting seat (264), a first gear (265) and a second gear (266). The first connecting seat (263) is rotatably connected to the left end face of the wedge-shaped door post (18) and close to the outside of the mine roadway (1), and one end of the first connecting seat (263) is fixedly connected to the side wall of the left door leaf assembly (19). The second connecting seat (264) is rotatably connected to the right end face of the wedge-shaped door post (18) and close to the outside of the mine roadway (1), and one end of the second connecting seat (264) is fixedly connected to the side wall of the right door leaf assembly (30). The first gear (265) is coaxially and fixedly connected to the first connecting seat (263), the second gear (266) is coaxially and fixedly connected to the second connecting seat (264), and the first gear (265) meshes with the second gear (266).

3. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 1, characterized in that: Counterweight devices (23) are installed on both sides of the new explosion-proof door foundation (6). The counterweight device (23) includes a vertically arranged lifting column (231), a first vertical fixed pulley (232) installed at the top of the lifting column (231), a counterweight block (234) sliding vertically on the lifting column (231), and a first steel wire rope (235) for connecting the counterweight block (234) to the left door leaf assembly (19) and the right door leaf assembly (30); one end of the first steel wire rope (235) on the left side is fixedly connected to the bottom of the left door leaf assembly (19), the other end is wound around the first vertical fixed pulley (232) on the left side and fixedly connected to the counterweight block (234) on the left side, one end of the first steel wire rope (235) on the right side is fixedly connected to the bottom of the right door leaf assembly (30), and the other end is wound around the first vertical fixed pulley (232) on the right side and fixedly connected to the counterweight block (234) on the right side.

4. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 1, characterized in that: Upper pull rod assemblies (14) are hinged on both sides of the upper end of the wedge-shaped door post (18), and the other end of each upper pull rod assembly (14) is hinged to the embedded top plate (9). Lower pull rod assemblies (21) are hinged on both sides of the lower end of the wedge-shaped door post (18), and the other end of the lower pull rod assembly (21) is hinged to the embedded bottom plate (10).

5. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 4, characterized in that: The lengths of the upper pull rod assembly (14) and the lower pull rod assembly (21) can be adjusted and fixed.

6. The construction method for safely replacing the explosion-proof door in a coal mine according to claim 1, characterized in that: A manual control component (41) is also installed on the outer side of the new explosion-proof door foundation (6) close to the mine roadway (1). There are two groups of manual control components (41). Each group of manual control components (41) includes a manual winch (411), a second steel wire rope (413), and a second horizontal fixed pulley (412). The second horizontal fixed pulley (412) is installed between the manual winch (411) and the left door leaf assembly (19) and the right door leaf assembly (30). One end of the second steel wire rope (413) on the left side is fixedly connected to the bottom of the left door leaf assembly (19), the other end is wound around the second horizontal fixed pulley (412) on the left side and fixedly connected to the manual winch (411) on the left side. One end of the second steel wire rope (413) on the right side is fixedly connected to the bottom of the right door leaf assembly (30), and the other end is wound around the second horizontal fixed pulley (412) on the right side and fixedly connected to the manual winch (411) on the right side.

7. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 6, characterized in that: A second vertical fixed pulley (233) is installed on the side wall of each lifting column (231) close to the door frame assembly (17); a first horizontal fixed pulley (32) is arranged on one side of the second horizontal fixed pulley (412) close to the lifting column (231). One end of the first steel wire rope (235) on the left side away from the lifting column (231) is successively wound around the second vertical fixed pulley (233) and the first horizontal fixed pulley (32) on the left side and fixedly connected to the bottom of the left door leaf assembly (19). One end of the first steel wire rope (235) on the right side away from the lifting column (231) is successively wound around the second vertical fixed pulley (233) and the first horizontal fixed pulley (32) on the right side and fixedly connected to the bottom of the right door leaf assembly (30).

8. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 7, characterized in that: The center height of the rope groove at the lower end of the second vertical fixed pulley (233) is the same as that of the rope groove of the first horizontal fixed pulley (32).

9. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 1, characterized in that: The air-reversal locking device (24) includes a mounting seat (241) installed on the side wall of the door frame assembly (17) close to the outer side of the mine roadway (1). An electric cylinder (242) is hinged to the top surface of the mounting seat (241). The piston rod end of the electric cylinder (242) is hinged to a first connecting rod (243). The first connecting rod (243) extends towards the middle of the door frame assembly (17). The end of the first connecting rod (243) away from the electric cylinder (242) is hinged to the side wall of the door frame assembly (17) close to the outer side of the mine roadway (1), and a first pressing block (244) is provided. The first pressing block (244) is inclined upwards. A transmission rod (245) extending upwards is hinged to the middle of the first connecting rod (243). The end of the transmission rod (245) away from the first connecting rod (243) is hinged to a second connecting rod (246). The second connecting rod (246) extends towards the middle of the door frame assembly (17). The end of the second connecting rod (246) away from the transmission rod (245) is hinged to the side wall of the door frame assembly (17) close to the outer side of the mine roadway (1), and a second pressing block (247) is provided. The second pressing block (247) is inclined upwards.

10. The construction method for safely replacing the explosion-proof door of a coal mine according to claim 9, characterized in that: First pads (248) and second pads (249) are provided on the side edges of the left door leaf assembly (19) and the right door leaf assembly (30) close to the outer side of the mine roadway (1). The first pads (248) are arranged in cooperation with the first pressing blocks (244), and the second pads (249) are arranged in cooperation with the second pressing blocks (247).

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