Construction method for rapid replacement of coal mine shaft explosion-proof door

Abstract

The present invention relates to the field of coal mine construction, and more particularly to a method for rapidly replacing explosion-proof doors in coal mine shafts, comprising the following steps: laying a foundation for a new explosion-proof door, pre-assembling the new explosion-proof door, positioning the new explosion-proof door, lifting the old explosion-proof door, installing the new explosion-proof door, removing redundant components, securing the valve assembly, and installing a vertical buffer device. The present invention enables rapid replacement of explosion-proof doors without stopping production and within the permitted ventilation time specified in the Coal Mine Safety Regulations.

Description

Technical Field

[0001] The invention relates to the field of coal mine construction, in particular to a construction method for quickly replacing a coal mine shaft explosion-proof door. Background Art

[0002] Coal mine shafts are equipped with ventilation systems to supply sufficient fresh air to underground personnel, ensuring normal movement and work. Currently, there are over 5,000 coal mines in my country, and most of these shafts utilize outdated, pot-lid-style explosion-proof doors. In the event of a gas or coal dust explosion underground, these doors can be blown away by the shockwave, causing a short circuit in the shaft, impacting the survival of those underground and hindering the timely implementation of rescue efforts. However, existing automatic-resetting explosion-proof doors on the market exert a significant impact force on the wellhead foundation when resetting.

[0003] In order to solve the above-mentioned defects, the Chinese patent with publication number CN103032092A discloses a multiple-buffered rising vertical shaft explosion-proof door, including fan blades, gears, buffer beams, base seats, buffer limit cylinders, and guide columns. Two fan blades are provided and are connected to the buffer beams through hinges. Two gears are provided and are connected to the fan blades one-to-one. The two gears are engaged with each other. The buffer beam slides vertically above the base seat, and the shoulders at both ends of the buffer beam are respectively provided with buffer boxes.

[0004] The working principle of the above-mentioned multiple buffered rising vertical shaft explosion-proof door is: when an explosion occurs underground in a coal mine, the two blades are affected by the explosion shock wave, and they open synchronously through gear meshing, and rise together with the buffer beam. Then, through the cooperation of the buffer box and the buffer limit cylinder, multiple buffering of the buffer beam is achieved, so that the energy of the explosion shock wave is consumed multiple times, thereby reducing the pulling force of the guide column on the wellhead foundation during explosion relief and the impact force of the buffer beam on the wellhead foundation when it falls and resets, thereby achieving the effect of allowing the explosion-proof door to be reset without causing major damage to the wellhead foundation.

[0005] Therefore, it is necessary to replace the old pot-lid type explosion-proof door on the existing coal mine ventilation shaft with the above-mentioned multiple buffer rising shaft explosion-proof door.

[0006] Regarding the aforementioned related technologies, the inventors believe that the traditional method for replacing explosion-proof doors requires first dismantling the old door and then assembling the new one over the open wellhead. This is time-consuming and requires shutting down the ventilation system while the new door is installed to prevent negative pressure from drawing objects outside the wellhead into the wellhead. If this shut-down period is prolonged, the gas concentration in the wellhead will increase, posing a significant safety hazard and potentially leading to production suspension and significant economic losses. Summary of the Invention

[0007] In order to quickly replace the old explosion-proof door with a new explosion-proof door without stopping production and within the allowable air stop time stipulated in the "Coal Mine Safety Regulations", the present application provides a construction method for quickly replacing the coal mine shaft explosion-proof door.

[0008] This application provides a construction method for quickly replacing a coal mine shaft explosion-proof door, which adopts the following technical solutions:

[0009] A construction method for quickly replacing a coal mine shaft explosion-proof door comprises the following steps:

[0010] Add a new explosion-proof door foundation: add a new explosion-proof door foundation outside the old explosion-proof door foundation, and combine the old explosion-proof door foundation and the new explosion-proof door foundation to form a combined explosion-proof door foundation;

[0011] Pre-assembly of new explosion-proof door: determine the pre-assembly site, set up the wedge-shaped beam at the pre-assembly site, hoist the assembly of buffer beam and door leaf to the upper side of the wedge-shaped beam, rotate the door leaf and buffer beam to connect them, fix the buffer beam and wedge-shaped beam, place the door leaf horizontally and detachably connect the door leaf and valve port through the connecting tooling, assemble and combine the buffer beam, wedge-shaped beam, door leaf and valve port to form a new explosion-proof door;

[0012] New explosion-proof door in place: hoist the new explosion-proof door to the top of the ventilation shaft;

[0013] Lift off the old explosion-proof door: After the new explosion-proof door is in place, temporarily shut down the ventilation system in the ventilation shaft, and during this short period of time, lift the old explosion-proof door off its foundation;

[0014] Install the new explosion-proof door: while lifting off the old explosion-proof door, gradually lift the new explosion-proof door onto the combined explosion-proof door foundation;

[0015] Remove unnecessary parts: After installing the new explosion-proof door, remove the connecting tooling;

[0016] Fixed valve port assembly: After installing the new explosion-proof door, fix the valve port assembly to the combined explosion-proof door foundation;

[0017] Install the vertical buffer device: After installing the new explosion-proof door, install the buffer and guide column on the basis of the combined explosion-proof door, put the buffer on the shoulder of the buffer beam, connect the buffer beam and the guide column along the vertical sliding connection, and install the buffer cylinder on the top of the guide column.

[0018] By adopting the above technical solution, the construction method for quickly replacing the explosion-proof door of the coal mine shaft is: adding a new explosion-proof door foundation, pre-assembling the new explosion-proof door, putting the new explosion-proof door in place, lifting the old explosion-proof door, installing the new explosion-proof door, removing unnecessary parts, fixing the valve port assembly, and installing the vertical buffer device.

[0019] In the step of pre-assembling the explosion-proof door foundation, the wedge-shaped beam and the buffer beam are fixed to each other, the buffer beam and the door leaf are a rotationally connected assembly, and the door leaf and the valve port are fixed to each other through the connecting tooling, so that the wedge-shaped beam, buffer beam, door leaf, and valve port are assembled into a whole to form a new explosion-proof door, which facilitates the overall lifting of the new explosion-proof door. After the new explosion-proof door is in place in advance, it is lifted away from the old explosion-proof door, and then the new explosion-proof door is quickly assembled as a whole on the combined explosion-proof door foundation, thereby achieving the effect of quickly replacing the explosion-proof door. Finally, the vertical buffer device is installed and the connecting tooling is removed.

[0020] The above technical solution can quickly replace the old explosion-proof door with a new one within the allowable ventilation stop time stipulated in the "Coal Mine Safety Regulations", without having to stop production and without posing a safety hazard.

[0021] Optionally, the door leaf and the buffer beam are in a state of being attached to and fixed to each other before arriving at the pre-assembly site. Before the door leaf is rotated to a horizontal state, the mutually fixed parts of the door leaf and the buffer beam need to be cut apart so that the door leaf and the buffer beam can rotate relative to each other.

[0022] By adopting the above technical solution, on the one hand, the door leaf and the buffer beam are fixed to each other before arriving at the pre-assembly site, reducing the possibility of relative rotation between the door leaf and the buffer beam; on the other hand, the door leaf and the buffer beam fit together, reducing the volume of the door leaf and the buffer beam after combination, thereby facilitating storage; thereby, achieving the effect of facilitating the transportation of the buffer beam and the door leaf.

[0023] Optionally, in the step of pre-assembling the new explosion-proof door, after the door leaf is rotated to a horizontal state, a fixing tool is installed between the door leaf and the buffer beam so that the buffer beam, the door leaf, and the fixing tool form a triangular structure. After the new explosion-proof door is installed at the mouth of the ventilation shaft, the fixing tool is removed.

[0024] By adopting the above technical solution, the buffer beam, door leaf and fixed tooling form a triangular structure, which reduces the possibility of relative rotation between the door leaf and the buffer beam when hoisting the new explosion-proof door, thereby improving the stability and safety of the new explosion-proof door during hoisting. At the same time, the fixed tooling provides a hoisting point, achieving the effect of facilitating hoisting.

[0025] Optionally, it also includes installing a positioning tool: after adding the foundation of the new explosion-proof door and before lifting the old explosion-proof door away, fix the positioning tool on the foundation of the combined explosion-proof door. The steps on the positioning tool face the right-angle positioning surface on the buffer beam for positioning support. After installing the new explosion-proof door, remove the positioning tool.

[0026] By adopting the above technical solution, the positioning tooling facilitates the precise positioning of the buffer beam during installation, reduces the difficulty of positioning the buffer beam, and thus facilitates the rapid installation of the new explosion-proof door.

[0027] Optionally, it also includes leveling the foundation: installing support pads on the combined explosion-proof door foundation to level the upper surface of the combined explosion-proof door foundation. After the new explosion-proof door is installed, the support pads are supported on the bottom of the valve port assembly.

[0028] By adopting the above technical solution, the upper surface of the combined explosion-proof door foundation is leveled using support pads, thereby improving the stability of the new explosion-proof door after installation and the sealing between the new explosion-proof door and the combined explosion-proof door foundation.

[0029] Optionally, after the valve port assembly is hoisted onto the valve port support, a sealing ring is fixed at the bottom of the valve port assembly, and after the new explosion-proof door is installed, the sealing ring is squeezed between the combined explosion-proof door base and the valve port assembly.

[0030] By adopting the above technical solution, the sealing ring further improves the sealing between the valve port assembly and the combined explosion-proof door base.

[0031] Optionally, in the step of placing the new explosion-proof door, the new explosion-proof door is hoisted to the position directly above the ventilation shaft by a crane, and then the new explosion-proof door is rotated to a position offset from the position directly above the ventilation shaft by the crane, thereby making room for lifting the old explosion-proof door away. After lifting the old explosion-proof door away, the new explosion-proof door is rotated again to the position directly above the ventilation shaft by the crane, and then the new explosion-proof door is moved to the base of the combined explosion-proof door.

[0032] By adopting the above technical solution, the new explosion-proof door is first hoisted to the top of the ventilation shaft, and then the new explosion-proof door is rotated to a position offset from the top of the ventilation shaft. While hoisting it away from the old explosion-proof door, the new explosion-proof door is rotated to the top of the ventilation shaft mouth, and then the new explosion-proof door is quickly lowered and installed on the basis of the combined explosion-proof door. The above operation process facilitates crane operation and has the effect of quickly installing the new explosion-proof door.

[0033] Optionally, after the new explosion-proof door is in place and before the old explosion-proof door is lifted off, the distance between the bottom of the wedge-shaped beam of the new explosion-proof door and the top of the old explosion-proof door is 200mm-300mm.

[0034] By adopting the above technical solution, the lifting height of the new explosion-proof door relative to the old explosion-proof door is set at 200mm-300mm. Firstly, during the process of the new explosion-proof door being in place, the new explosion-proof door can rotate to make a suitable lifting space, which is convenient for lifting it away from the old explosion-proof door. At the same time, the new explosion-proof door can be quickly placed in place on the combination explosion-proof door foundation, achieving the effect of quickly installing the new explosion-proof door. Secondly, it ensures safe lifting and accurate installation of the new explosion-proof door.

[0035] Optionally, it also includes installing a counterweight device: installing a counterweight device on the basis of the combined explosion-proof door. When the ventilation system in the ventilation shaft stops working, the counterweight device can be used to open the door leaf to allow natural ventilation of the ventilation shaft.

[0036] By adopting the above technical solution, when the ventilation system in the ventilation shaft stops working and natural ventilation is required, the door leaf is opened by using the counterweight device, thereby facilitating natural ventilation of the ventilation shaft.

[0037] Optionally, during the process of fixing the valve port assembly, the valve port assembly is fixed by filling cement slurry between the valve port assembly and the combined explosion-proof door foundation.

[0038] By adopting the above technical solution, the valve port assembly can be stably fixed on the combined explosion-proof door base.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] 1. The construction method for quickly replacing a coal mine shaft explosion-proof door is as follows: adding a new explosion-proof door foundation, pre-assembling the new explosion-proof door, placing the new explosion-proof door in place, lifting the old explosion-proof door away, installing the new explosion-proof door, removing unnecessary components, fixing the valve port assembly, and installing a vertical buffer device. The new explosion-proof door is formed by assembling a wedge beam, a buffer beam, a door leaf, and a valve port, and the new explosion-proof door is hoisted as a whole. This allows the explosion-proof door to be quickly replaced without stopping production at the coal mine and within the allowable air suspension time specified in the Coal Mine Safety Regulations.

[0041] 2. The door leaf and the buffer beam are attached to and fixed to each other before arriving at the pre-assembly site. The door leaf and the buffer beam will not rotate relative to each other, which reduces the volume occupied by the door leaf and the buffer beam after assembly, making it easier to transport the buffer beam and the door leaf.

[0042] 3. The buffer beam, door leaf, and fixed fixture form a triangular structure, which reduces the possibility of relative rotation between the door leaf and the buffer beam when hoisting the new explosion-proof door, thereby improving the stability and safety of the new explosion-proof door during hoisting. At the same time, the fixed fixture provides a hoisting point, achieving the effect of facilitating hoisting;

[0043] 4. After the new explosion-proof door is pre-assembled, it is hoisted above the ventilation shaft and then rotated to make room for lifting it away from the old explosion-proof door. This allows the new explosion-proof door to be quickly installed after being lifted away from the old explosion-proof door, further saving time in replacing the explosion-proof door. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural diagram of the old explosion-proof door and the combined explosion-proof door foundation of Example 1 of the present application.

[0045] Figure 2 It is a structural schematic diagram of the buffer beam and positioning tooling of Example 1 of the present application.

[0046] Figure 3 It is a structural schematic diagram of the buffer beam support, buffer beam, and wedge beam of Example 1 of the present application.

[0047] Figure 4 yes Figure 3 The left view is mainly used to show the door leaf, gears and fixed tooling.

[0048] Figure 5 yes Figure 4 The enlarged view of part A is mainly used to show the connecting tooling and sealing ring.

[0049] Figure 6 It is a structural diagram of the replacement of the coal mine shaft explosion-proof door in Example 1 of the present application after the construction is completed, which is mainly used to reflect the vertical buffer device.

[0050] Description of reference numerals:

[0051] 10. New explosion-proof door foundation; 11. Old explosion-proof door foundation; 12. Combined explosion-proof door foundation; 13. Support shims; 14. Positioning tooling; 15. New explosion-proof door; 16. Old explosion-proof door; 20. Buffer beam support; 21. Wedge-shaped beam bracket; 22. Valve port support; 23. Wedge-shaped beam; 24. Valve port assembly; 25. Sealing ring; 26. Buffer beam; 27. Door leaf; 28. Hinge; 29. ​​Gear; 30. Fixing tooling; 31. Connecting tooling; 40. Vertical buffer device; 41. Buffer; 42. Guide column; 43. Crossbeam; 44. Buffer cylinder; 45. Counterweight device. DETAILED DESCRIPTION

[0052] The following is combined with Figure 1-6 This application is described in further detail.

[0053] The embodiment of the present application discloses a construction method for quickly replacing an explosion-proof door of a coal mine shaft.

[0054] Example 1

[0055] The construction method for quickly replacing the explosion-proof door of a coal mine shaft includes the following steps:

[0056] Adding a new explosion-proof door foundation 10: refer to Figure 1 A new explosion-proof door foundation 10 is added outside the old explosion-proof door foundation 11 according to the design requirements, and the old explosion-proof door foundation 11 and the new explosion-proof door foundation 10 are connected as a whole by means of planting steel bars and the like to form a combined explosion-proof door foundation 12.

[0057] Leveling Basics: Reference Figure 2After adding the new explosion-proof door foundation 10, install supporting pads 13 on the combined explosion-proof door foundation 12. Set multiple groups of supporting pads 13, with four supporting pads 13 in each group. Use a spirit level to find the level, connect and fix the supporting pads 13 to the combined explosion-proof door foundation 12, so as to level the upper surface of the combined explosion-proof door foundation 12.

[0058] Installation positioning tool 14: refer to Figure 2 After adding the new explosion-proof door foundation 10, fix the positioning tooling 14 on the combined explosion-proof door foundation 12.

[0059] The height of the positioning fixture 14 above the supporting pad 13 is determined according to the specifications of the new explosion-proof door 15 .

[0060] Pre-assembled new explosion-proof door 15: Figure 1 、 Figure 3 、 Figure 4 According to the hoisting requirements, a pre-assembly site is determined near the old explosion-proof door foundation 11; the buffer beam support 20, the wedge beam bracket 21, and the valve port support 22 are fixed at the pre-assembly site, and the wedge beam 23 is positioned on the wedge beam bracket 21. The wedge beam 23 is a hollow triangular prism welded by welding a plurality of metal plates, and the tip of the wedge beam 23 is set downward; the height of the buffer beam support 20 is required to be 5mm greater than the height of the wedge beam 23. If the height is not enough, the buffer beam support 20 can be adjusted by adding shims;

[0061] Reference Figure 3 、 Figure 4 、 Figure 5 , splice several arc-shaped support members with bolts to form an annular valve port assembly 24. After assembling the valve port assembly 24, hoist the valve port assembly 24 onto the valve port support 22. Adjust the valve port assembly 24 horizontally. After the adjustment and measurement are qualified, weld the joints between the several arc-shaped support members in the valve port assembly 24. Then, glue and fix the sealing ring 25 at the bottom of the valve port assembly 24.

[0062] Reference Figure 3 、 Figure 4 , the buffer beam 26 can be provided with a plurality of buffer beams 26 according to the size of the ventilation shaft wellhead. This embodiment is described with one buffer beam 26 as an example. The buffer beam 26 is rotatably connected to two door leaves 27 through a hinge 28;

[0063] Reference Figure 3 、 Figure 4 Since there is only one buffer beam 26, the door leaf 27 should be semicircular, and the two door leaves 27 work together to block the combined explosion-proof door base 12. When the ventilation shaft opening is large, two or three buffer beams 26 can be installed. In this case, when multiple door leaves 27 are all in a horizontal state, they can block the combined explosion-proof door base 12;

[0064] Reference Figure 3 、 Figure 4 , still taking a buffer beam 26 as an example, a gear 29 is connected to the door leaf 27, and the gear 29 axis is coaxial with the hinge 28 axis, so that the door leaf 27 can rotate synchronously with the gear 29, and the two gears 29 are meshed with each other;

[0065] Reference Figure 3 、 Figure 4 In order to facilitate the transportation of the buffer beam 26 and the door leaf 27, the end of the door leaf 27 away from the hinge 28 is welded and fixed to the buffer beam 26, so that the door leaf 27 and the buffer beam 26 are in close contact. On the one hand, the possibility of relative rotation between the door leaf 27 and the buffer beam 26 is reduced, and on the other hand, the volume of the buffer beam 26 and the door leaf 27 after combination is reduced, making the combination of the buffer beam 26 and the door leaf 27 more regular and convenient for storage;

[0066] Reference Figure 4 After transporting the buffer beam 26 and the door leaf 27 to the pre-assembly site, the welded portion between the buffer beam 26 and the door leaf 27 is cut to allow the door leaf 27 to rotate relative to the buffer beam 26. The door leaf 27 is then rotated to a horizontal state, and a fixing fixture 30 is fixed between the door leaf 27 and the buffer beam 26. The fixing fixture 30 can be a fixing rod or a fixing plate, so that the door leaf 27, the fixing fixture 30, and the buffer beam 26 form a stable triangular structure.

[0067] Reference Figure 3 、 Figure 4 After the installation of the fixing tool 30 is completed, the assembly of the buffer beam 26, the door leaf 27, and the hinge 28 is hoisted to the upper part of the wedge-shaped beam 23, and the buffer beam 26 and the wedge-shaped beam 23 are positioned relative to each other by plugging and fitting the key and the keyway. The buffer beam 26 and the wedge-shaped beam 23 are fixed by bolts, and the buffer beam 26 is overlapped on the buffer beam support 20;

[0068] Reference Figure 4 、 Figure 5 The door leaf 27 and the valve port assembly 24 are fixed to each other using the connecting fixture 31. The connecting fixture 31 is a combination of a pressure plate and bolts, thereby realizing a detachable connection between the door leaf 27 and the valve port assembly 24. By fine-tuning the connecting fixture 31, the door leaf 27 and the valve port assembly 24 are tightly fitted.

[0069] Reference Figure 4 、 Figure 5 、 Figure 6 The buffer beam 26, the wedge beam 23, the door leaf 27 and the valve port assembly 24 are combined to form a new explosion-proof door 15.

[0070] Two cranes are in place, and temporary sealing materials such as air duct cloth are in place. One crane is used to lift the new explosion-proof door 15, and the other crane is used to lift away the old explosion-proof door 16.

[0071] New explosion-proof door 15 is in place: refer to Figure 3 、 Figure 4 , use a crane to lift the new explosion-proof door 15, separate the buffer beam 26 from the buffer beam support 20, separate the wedge beam 23 from the wedge beam bracket 21, and separate the valve port assembly 24 from the valve port support 22. Observe whether the stability of the new explosion-proof door 15 is good after lifting. If it is good, continue lifting. If it is not stable, adjust the lifting point or the length of the lifting wire to ensure that the new explosion-proof door 15 is lifted stably.

[0072] Reference Figure 4 , use a crane to move the new explosion-proof door 15 to the top of the ventilation shaft. At this time, the center line of the new explosion-proof door 15 is consistent with the center line of the ventilation shaft, and the two ends of the buffer beam 26 are also within the predetermined error range of ±30mm. Record the lifting time, and the allowed time is 2 minutes;

[0073] Reference Figure 3 、 Figure 4 Hoist the new explosion-proof door 15 to its original position, placing the wedge beam 23 on the wedge beam support 21, the buffer beam 26 on the buffer beam support 20, and the valve assembly 24 on the valve support 22. Repeat hoisting the new explosion-proof door 15 to the top of the ventilation shaft three times, and record whether the time is within the permitted range;

[0074] Reference Figure 1 、 Figure 4 、 Figure 6 After the hoisting time reaches the permitted range, use a crane to hoist the new explosion-proof door 15 to a predetermined height directly above the ventilation shaft, with the vertical height of the bottom of the wedge-shaped beam 23 of the new explosion-proof door 15 preferably being 200mm-300mm from the top of the old explosion-proof door 16. Then rotate the new explosion-proof door 15 to a position that is offset from directly above the ventilation shaft, thereby making room for hoisting it away from the old explosion-proof door 16.

[0075] Lift off the old explosion-proof door 16: refer to Figure 1 、 Figure 2 After the new explosion-proof door 15 is in place and the foundation is leveled and the positioning tool 14 is installed, the hook on another crane is connected to the old explosion-proof door 16, and then the wind is briefly stopped. During the short wind stop, the old explosion-proof door 16 is quickly lifted out of the ventilation shaft in the predetermined direction.

[0076] Install new explosion-proof door 15: refer to Figure 1 、 Figure 2 , after lifting off the old explosion-proof door 16, quickly rotate the new explosion-proof door 15 to just above the ventilation shaft, ensuring that the bottom of the wedge-shaped beam 23 of the new explosion-proof door 15 can enter the central space of the combined explosion-proof door foundation 12;

[0077] Reference Figure 2If time permits, adjust the position of the new explosion-proof door 15 accurately, and then quickly lower the new explosion-proof door 15 so that the new explosion-proof door 15 is installed at the wellhead of the ventilation shaft; if time does not permit, the new explosion-proof door 15 must be lowered within 7 minutes;

[0078] Reference Figure 2 After the new explosion-proof door 15 is lowered, the ventilation system in the ventilation shaft is started, and the position of the new explosion-proof door 15 is observed at the same time. If there is air leakage between the new explosion-proof door 15 and the combined explosion-proof door foundation 12, it is directly blocked with temporary sealing materials;

[0079] Reference Figure 2 If the position of the new explosion-proof door 15 on the combined explosion-proof door needs to be fine-tuned, after the underground parameters reach the permitted level, stop the air flow and use a crane to fine-tune the new explosion-proof door 15 so that the new explosion-proof door 15 is accurately positioned.

[0080] Reference Figure 2 After the new explosion-proof door 15 is installed, the supporting washer 13 is supported on the bottom of the valve mouth assembly 24, and the supporting washer 13 provides a stable support for the valve mouth assembly 24, thereby improving the stability of the new explosion-proof door 15 after installation and the sealing between the new explosion-proof door 15 and the combined explosion-proof door foundation 12; the right-angled step on the positioning tool 14 supports the right-angled positioning surface on the buffer beam 26, so that the positioning tool 14 plays a positioning role on the buffer beam 26, reducing the positioning difficulty of the buffer beam 26 and improving the speed of installation of the new explosion-proof door 15; after the installation of the new explosion-proof door 15 is completed, the positioning tool 14 is removed, and the sealing ring 25 is squeezed between the combined explosion-proof door foundation 12 and the valve mouth assembly 24, further improving the sealing between the new explosion-proof door 15 and the combined explosion-proof door foundation 12.

[0081] When the vertical height between the bottom of the wedge-shaped beam 23 of the new explosion-proof door 15 and the top of the old explosion-proof door 16 is 200 mm, the lifting space formed after the new explosion-proof door 15 is rotated allows the old explosion-proof door 16 to be lifted off the combined explosion-proof door foundation 12 through the lifting space.

[0082] When the vertical height between the bottom of the wedge-shaped beam 23 of the new explosion-proof door 15 and the top of the old explosion-proof door 16 is 250 mm, the lifting space formed after the new explosion-proof door 15 rotates allows the old explosion-proof door 16 to be lifted off the combined explosion-proof door foundation 12 through the lifting space, and the time for the new explosion-proof door 15 to fall onto the combined explosion-proof door foundation 12 is relatively suitable;

[0083] When the vertical height between the bottom of the wedge-shaped beam 23 of the new explosion-proof door 15 and the top of the old explosion-proof door 16 is 300 mm, the lifting space formed after the rotation of the new explosion-proof door 15 allows the old explosion-proof door 16 to be smoothly lifted off the combined explosion-proof door foundation 12 through the lifting space, and the time it takes for the new explosion-proof door 15 to fall to the combined explosion-proof door is longer but still within the allowed time range.

[0084] Remove excess parts: Refer to Figure 2 、 Figure 4 , remove the connecting tooling 31, the fixing tooling 30, and the positioning tooling 14.

[0085] Fixed valve port assembly 24: refer to Figure 2 After installing the new explosion-proof door 15 , cement slurry is filled between the valve port assembly 24 and the combined explosion-proof door foundation 12 , so that the valve port assembly 24 is fixed on the combined explosion-proof door foundation 12 .

[0086] Install vertical buffer device 40: refer to Figure 6 After grouting, a buffer 41 and a guide column 42 are installed on the new explosion-proof door foundation 10, so that the buffer 41 is vertically slidably arranged above the combined explosion-proof door foundation 12; a buffer 41 is sleeved on both ends of the buffer beam 26. When the buffer beam 26 is in the initial state, the upper surface of the end of the buffer beam 26 does not contact the buffer 41, so that when an explosion occurs in the well, the buffer beam 26 rises a certain distance before it can drive the buffer 41 to rise; the buffer beam 26 is connected to the guide column 42 in a vertical sliding manner. In this embodiment, the buffer beam 26 and the guide column 42 are connected in a sliding manner in that the guide column 42 is inserted into the buffer beam 26, and the buffer beam 26 can slide vertically along the guide column 42;

[0087] Reference Figure 6 There are two guide columns 42, both of which play a role in vertically guiding the buffer beam 26. A crossbeam 43 is fixed between the tops of the two guide columns 42 to reinforce the two guide columns 42.

[0088] Reference Figure 6 A buffer cylinder 44 is installed at the top of the guide column 42. The buffer cylinder 44 is filled with foam metal. After the buffer beam 26 impacts the buffer cylinder 44, the foam metal is compressed and plastically deformed, thereby absorbing the kinetic energy of the buffer beam 26. The buffer cylinder 44 is used to limit the rising height of the buffer beam 26.

[0089] After the explosion is released, the foam metal undergoes plastic deformation and hardly rebounds, so the buffer beam 26 and the door leaf 27 fall freely almost only under the action of gravity, which greatly reduces the impact force of the buffer beam 26 on the valve port assembly 24 and the combined explosion-proof door base 12 when it falls.

[0090] Install the counterweight device 45: refer to Figure 4 、 Figure 6 A counterweight device 45 is installed on the combined explosion-proof door foundation 12. When the ventilation system in the ventilation shaft stops working, the counterweight device 45 can be used to open the door leaf 27 to allow natural ventilation of the ventilation shaft.

[0091] Fixed vertical buffer device 40 and counterweight device 45: refer to Figure 6 After the installation of the vertical buffer device 40 and the installation of the counterweight device 45 is completed, cement slurry is filled between the bottom of the guide column 42 and the combined explosion-proof door foundation 12, and cement slurry is filled between the bottom of the counterweight device 45 and the combined explosion-proof door foundation 12, so that the guide column 42 and the counterweight device 45 are stably installed on the combined explosion-proof door foundation 12.

[0092] When an explosion occurs underground in a coal mine, the majority of the blast wave is directed toward the door panels 27. The wedge-shaped beam 23, using its inclined surface, channels the blast wave to the bottoms of the two door panels 27, reducing the blast wave energy borne by the wedge-shaped beam 26 and minimizing the possibility of damage. Upon receiving the blast wave, the two door panels 27 open synchronously through the meshing of gears 29, rising together with the buffer beam 26. After the buffer beam 26 rises to a certain height, the upper surface of its shoulder first inelastically collides with the buffer 41. After the buffer 41 absorbs some of the kinetic energy of the buffer beam 26, the buffer beam 26, door panels 27, and the buffer 41 continue to rise together. The buffer beam 26 then collides with the buffer cylinder 44, compressing the foam metal therein, allowing the buffer cylinder 44 to absorb the kinetic energy of the buffer beam 26 and door panels 27.

[0093] Next, the buffer beam 26 falls freely under the force of gravity, while the buffer 41 continues to rise. The lower surface of the end of the buffer beam 26 first collides inelastically with the buffer 41. Then, the buffer beam 26, the door leaf 27, and the buffer 41 all collide upward with the buffer cylinder 44, causing the buffer cylinder 44 to absorb the remaining kinetic energy of the buffer beam 26, the door leaf 27, and the buffer 41. The buffer beam 26, the door leaf 27, and the buffer 41 then fall freely, and finally, the buffer beam 26 falls onto the combined explosion-proof door base 12. Thus, by buffering the buffer beam 26 multiple times, the energy of the explosion shock wave is dissipated multiple times, thereby reducing the impact force on the combined explosion-proof door base 12 when the buffer beam 26 falls and resets. In particular, the buffer cylinder 44 buffers the buffer beam 26 twice, thereby absorbing the energy generated by the explosion twice and reducing the peak tensile force exerted by the guide column on the combined explosion-proof door base 12. This technical solution not only allows the new explosion-proof door 15 to be reset, but also prevents significant damage to the combined explosion-proof door base 12.

[0094] The implementation principles of Example 1 are as follows: adding a new explosion-proof vent foundation 10, leveling the foundation, installing positioning tooling 14, pre-assembling a new explosion-proof vent 15, positioning the new explosion-proof vent 15, lifting the old explosion-proof vent 16, installing the new explosion-proof vent 15, removing unnecessary components, securing the valve port assembly 24, installing the vertical buffer device 40, installing the counterweight device 45, and securing the vertical buffer device 40 and the counterweight device 45. Except for the order of steps emphasized in this example, the remaining steps are not sequential.

[0095] By adding a new explosion-proof door foundation 10, the new explosion-proof door foundation 10 and the old explosion-proof door foundation 11 are connected to form a combined explosion-proof door foundation 12. The combined explosion-proof door foundation 12 is leveled using shims, and the positioning tool 14 is fixed to the combined explosion-proof door foundation 12. The new explosion-proof door 15 is assembled at the pre-assembly site. When assembling the new explosion-proof door 15, the buffer beam 26 and the wedge beam 23 are fixed with bolts, and the door leaf 27 and the buffer beam 26 are fixed to each other using the fixing tool 30. The door leaf 27 and the valve port assembly 24 are fixed to each other using the connecting tool 31. The new explosion-proof door 15 is assembled, which facilitates the overall lifting of the new explosion-proof door 15.

[0096] The new explosion-proof door 15 is hoisted into place above the ventilation shaft, and then the new explosion-proof door 15 is rotated by a crane to make a hoisting space above the ventilation shaft. Another crane uses the hoisting space to lift the old explosion-proof door 16 out of the ventilation shaft. At the same time, the crane that lifts the new explosion-proof door 15 quickly hoists the new explosion-proof door 15 onto the combined explosion-proof door foundation 12. The positioning tool 14 positions the buffer beam 26 of the new explosion-proof door 15 to complete the installation of the new explosion-proof door 15.

[0097] After the new explosion-proof door 15 is installed, the fixing fixture 30, the connecting fixture 31 and the positioning fixture 14 are removed, and cement grout is often filled between the valve assembly 24 and the combined explosion-proof door base 12. After the vertical buffer device 40 and the counterweight device 45 are installed, the guide column 42 and the counterweight device 45 are grouted again.

[0098] Through the above construction method, the explosion-proof door can be quickly replaced without stopping production and within the allowable air stop time stipulated in the "Coal Mine Safety Regulations".

[0099] Example 2

[0100] The difference between Example 2 and Example 1 is that the new explosion-proof door 15 is positioned differently, the rotation of the new explosion-proof door 15 is eliminated, and the new explosion-proof door 15 can be directly hoisted directly above the ventilation shaft. The vertical height between the bottom of the new explosion-proof door 15 and the top of the old explosion-proof door 16 is not limited to 200mm-300mm, and space is reserved to lift it away from the old explosion-proof door 16. Therefore, after the old explosion-proof door 16 is lifted away, the new explosion-proof door 15 can be directly driven to fall, completing the installation of the new explosion-proof door 15.

[0101] Example 3

[0102] Example 3 differs from Example 1 in that the new explosion-proof vent 15 is positioned differently, eliminating the need for rotation. Instead, the new explosion-proof vent 15 can be hoisted and installed to the side and upper side of the ventilation shaft, ensuring that the vertical height between the bottom of the new explosion-proof vent 15 and the top of the old explosion-proof vent 16 is no longer limited to 200 mm to 300 mm. After the old explosion-proof vent 16 is removed, the new explosion-proof vent 15 is first hoisted and moved to directly above the ventilation shaft, and then lowered, completing the installation of the new explosion-proof vent 15.

[0103] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction method for quickly replacing a coal mine shaft explosion-proof door, characterized by: The following steps are involved: Adding a new explosion-proof door foundation (10): Adding a new explosion-proof door foundation (10) outside the old explosion-proof door foundation (11), and combining the old explosion-proof door foundation (11) and the new explosion-proof door foundation (10) to form a combined explosion-proof door foundation (12); Pre-assembling the new explosion-proof door (15): determining a pre-assembly site, setting up a wedge-shaped beam (23) at the pre-assembly site, hoisting the assembly of the buffer beam (26) and the door leaf (27) to the upper side of the wedge-shaped beam (23), rotating the door leaf (27) and the buffer beam (26), fixing the buffer beam (26) and the wedge-shaped beam (23), placing the door leaf (27) horizontally and detachably connecting the door leaf (27) and the valve assembly (24) through a connecting tool (31), and then assembling the buffer beam (26), the wedge-shaped beam (23), the door leaf (27) and the valve assembly (24) to form a new explosion-proof door (15); New explosion-proof door (15) in place: hoist the new explosion-proof door (15) to the top of the ventilation shaft and put it in place; Lifting off the old explosion-proof door (16): After the new explosion-proof door (15) is in place, the ventilation system in the ventilation shaft is temporarily stopped, and during the short stoppage time, the old explosion-proof door (16) is lifted off the old explosion-proof door foundation (11); Installing the new explosion-proof door (15): while lifting it away from the old explosion-proof door (16), gradually hoist the new explosion-proof door (15) onto the combined explosion-proof door foundation (12); Remove unnecessary parts: After installing the new explosion-proof door (15), remove the connecting tool (31); Fixing the valve port assembly (24): After installing the new explosion-proof door (15), fix the valve port assembly (24) to the combined explosion-proof door foundation (12); Installing the vertical buffer device (40): After installing the new explosion-proof door (15), install the buffer (41) and the guide column (42) on the combined explosion-proof door foundation (12), sleeve the buffer (41) on the shoulder of the buffer beam (26), connect the buffer beam (26) and the guide column (42) along the vertical sliding direction, and install the buffer cylinder (44) on the top of the guide column (42).

2. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: The door leaf (27) and the buffer beam (26) are in a state of being attached to and fixed to each other before arriving at the pre-assembly site. Before the door leaf (27) is rotated to a horizontal state, the mutually fixed portion of the door leaf (27) and the buffer beam (26) needs to be cut apart so that the door leaf (27) and the buffer beam (26) can rotate relative to each other.

3. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: In the step of pre-assembling the new explosion-proof door (15), after the door leaf (27) is rotated to a horizontal state, a fixing tool (30) is installed between the door leaf (27) and the buffer beam (26), so that the buffer beam (26), the door leaf (27), and the fixing tool (30) form a triangular structure. After the new explosion-proof door (15) is installed at the wellhead of the ventilation shaft, the fixing tool (30) is removed.

4. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: The invention also includes installing a positioning tool (14): after the new explosion-proof door foundation (10) is added and before the old explosion-proof door (16) is lifted off, the positioning tool (14) is fixed on the combined explosion-proof door foundation (12), the step on the positioning tool (14) faces the right-angle positioning surface on the buffer beam (26) for positioning support, and after the new explosion-proof door (15) is installed, the positioning tool (14) is removed.

5. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: The invention also includes a leveling foundation: a support washer (13) is installed on the combined explosion-proof door foundation (12), thereby leveling the upper surface of the combined explosion-proof door foundation (12); after the new explosion-proof door (15) is installed, the support washer (13) is supported on the bottom of the valve port assembly (24).

6. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 5 is characterized in that: After the valve port assembly (24) is hoisted onto the valve port support (22), a sealing ring (25) is fixed at the bottom of the valve port assembly (24). After the new explosion-proof door (15) is installed, the sealing ring (25) is squeezed between the combined explosion-proof door base (12) and the valve port assembly (24).

7. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: In the step of placing the new explosion-proof door (15), the new explosion-proof door (15) is hoisted to the position directly above the ventilation shaft by a crane, and then the new explosion-proof door (15) is rotated to a position offset from the position directly above the ventilation shaft by a crane, thereby making room for hoisting the old explosion-proof door (16). After hoisting the old explosion-proof door (16), the new explosion-proof door (15) is rotated again to the position directly above the ventilation shaft by a crane, and then the new explosion-proof door (15) is moved to the combined explosion-proof door foundation (12).

8. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 7 is characterized in that: After the new explosion-proof door (15) is in place, before the old explosion-proof door (16) is lifted off, the distance between the bottom of the wedge-shaped beam (23) of the new explosion-proof door (15) and the top of the old explosion-proof door (16) is 200mm-300mm.

9. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1 is characterized in that: The invention also includes installing a counterweight device (45): the counterweight device (45) is installed on the combined explosion-proof door foundation (12). When the ventilation system in the ventilation shaft stops working, the counterweight device (45) can be used to open the door leaf (27) to allow the ventilation shaft to be naturally ventilated.

10. The construction method for quickly replacing a coal mine shaft explosion-proof door according to claim 1, characterized in that: During the process of fixing the valve port assembly (24), the valve port assembly (24) is fixed by filling cement slurry between the valve port assembly (24) and the combined explosion-proof door foundation (12).

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