CN114165285A - Signal handle hook control device for trolley on upper and lower wellhead tracks of coal mine auxiliary vertical shaft - Google Patents
Signal handle hook control device for trolley on upper and lower wellhead tracks of coal mine auxiliary vertical shaft Download PDFInfo
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- CN114165285A CN114165285A CN202111513193.7A CN202111513193A CN114165285A CN 114165285 A CN114165285 A CN 114165285A CN 202111513193 A CN202111513193 A CN 202111513193A CN 114165285 A CN114165285 A CN 114165285A
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- 239000003245 coal Substances 0.000 title claims abstract description 21
- 238000005452 bending Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 17
- 238000013519 translation Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000035622 drinking Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000005065 mining Methods 0.000 description 9
- 238000007689 inspection Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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- 238000010223 real-time analysis Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention relates to a signal catch hook control device for a tramcar on an upper and lower wellhead track of a coal mine auxiliary vertical shaft, belonging to the field of mine car in-out control and personnel control on an upper track of a coal mine. The technical scheme adopted by the invention is as follows: the device comprises a wellhead upper track positioned above a vertical shaft and a wellhead lower track in the vertical shaft, wherein the wellhead upper track and the wellhead lower track in the vertical shaft are intersected at a cage position at a wellhead; the track on the well mouth is divided into an aboveground left track and an aboveground right track at the well mouth position, the aboveground left track and the aboveground right track are respectively provided with an aboveground double track, an aboveground single track and an aboveground multi-bending track from the well mouth position to the far end, the aboveground double track, the aboveground single track and the aboveground multi-bending track are connected, and a car pusher is respectively arranged on the connection of the aboveground double track, the aboveground single track and the aboveground multi-bending track, so that the invention has the advantages that: the reciprocating dispatching of the car pusher is reduced through the reasonable arrangement of the car pusher on the track, and the field operation of a wellhead hook worker is reduced.
Description
Technical Field
The invention relates to a signal catch hook control device for a tramcar on an upper and lower wellhead track of a coal mine auxiliary vertical shaft, belonging to the field of mine car in-out control and personnel control on an upper track of a coal mine.
Background
At present, the auxiliary vertical shaft signal car operating system of the same mine and many similar coal mines is that a hooking worker carries out hooking operation on a car pusher area mine car entering tank at a wellhead position, and a dotting room signal worker carries out car operating area, wellhead safety facilities and signal operation.
However, the mine car and personnel control at the well head position have many disadvantages, for example, the occupied personnel are more, and at least 1 hitter and 1 signaler are respectively needed for the upper well head and the lower well head of the auxiliary well. And the existing operation links are frequent, manual shunting, operation and signaling are needed, the labor consumption is high, and the misoperation risk exists.
At present, an intelligent waste rock discharging system for a coal mine performs automatic intelligent control on a signal hook control position of an upper well mouth and a lower well mouth of an auxiliary vertical shaft by utilizing an annular mine car yard, optimizes and integrates signals of the auxiliary vertical shaft, the hook control system and a car operating system, and a signal worker in a dotting room is cancelled, so that automatic intelligent car operating, hook control and signal signaling can be easily completed as long as 1 worker monitors and operates, the energy consumption of workers is reduced, the purposes of saving the workers and improving the safety and the efficiency are achieved. However, there is a great mismatch between the circular mine car yard of the refuse discharge system and the existing non-circular yard, and improvements in the track and control system are required.
Disclosure of Invention
Aiming at the problems, the invention provides a coal mine auxiliary vertical shaft rail upper and lower well mouth trolley signal hook control device, which solves the control problems that the auxiliary vertical shaft has more people for upper and lower well mouths and vehicle access and parking lots, and the operation procedures are complex.
In order to achieve the purpose, the invention adopts the technical scheme that:
a control device for a coal mine auxiliary vertical shaft upper and lower wellhead track upper cart signal handle hook comprises,
the upper wellhead track and the lower wellhead track in the shaft are intersected at the position of a cage at the wellhead;
the upper well head track is divided into an upper left well track and an upper right well track at the position of a well head, the upper left well track and the upper right well track are respectively provided with an upper double track, an upper single track and an upper multi-bending track from the position of the well head to the far end, the upper double track, the upper single track and the upper multi-bending track are connected, and car pushers are respectively arranged on the upper double track, the upper single track and the upper multi-bending track;
the underground track is divided into an underground left track and an underground right track at the bottom of the well, the underground left track and the underground right track are respectively provided with an underground double track and an underground single track from the bottom of the well to the far end, and the underground double track and the underground single track are respectively provided with a car pusher.
Preferably, the aboveground double tracks of the left-side track on the well and the aboveground single track are connected through hydraulic symmetrical turnouts, the aboveground single track is connected with the aboveground multi-bending track through translation turnouts, the aboveground double tracks of the left-side track on the well are two long-distance parallel tracks, rail-holding type car stoppers are respectively arranged at positions close to the end parts, a track scale is arranged on the aboveground single track of the left-side track on the well, and the rail-holding type car stoppers are arranged at the end parts of the aboveground multi-bending track of the left-side track on the well.
Preferably, the aboveground double tracks of the aboveground right-side track are two straight-line crossed tracks and are connected with the aboveground single track through hydraulic turnouts, and the aboveground double tracks of the aboveground right-side track are not provided with car pushers.
Preferably, the underground left side track is internally provided with an underground left side crossed double track, an underground left side single track and an underground left side conveying track respectively from the position of a well head, the underground right side track is internally provided with an underground right side parallel double track, an underground right side single track and an underground right side conveying track respectively from the position of the well head, and the right side parallel double track and the underground right side single track are respectively provided with a car pusher.
As preferred, still include well head cage department and be equipped with upper personnel entry to one set of personnel of installation examine body system, emergency exit personnel identification system, personnel examine the body system and carry forbidden article and alcohol detection to the personnel in the pit, emergency exit personnel identification system includes camera and infrared sensor, gathers the image information of well head emergency exit department in real time, and emergency exit personnel identification system's server carries out real-time analysis and processing to the image, detects emergency exit department personnel situation of detaining.
Preferably, a visible light camera is arranged at the position of the track scale on the aboveground single track of the left side track on the shaft, the visible light camera identifies the mine car on the track by taking the track center line, the track surface height and the single vehicle center as references and can respectively measure the length, the width and the height of the mine car, and when the visible light camera detects that the mine car is abnormal, the aboveground single track push-up trolley machine of the left side track on the shaft returns the abnormal mine car to an empty track of the multi-bending track on the shaft from the translation turnout. .
Preferably, a mining general intrinsic safety industrial personal computer is deployed at the position of the upper port of the well, a mining explosion-proof computer is deployed at the position of the lower port of the well, the mining general intrinsic safety industrial personal computer is communicated with a personnel detection system and a safety door personnel identification system through cables, the mining explosion-proof computer at the upper port of the well and the mining explosion-proof computer at the lower port of the well perform data interaction with a background control server, and the personnel detection system and the safety door personnel identification system identify the acquired state.
Preferably, the loading width of the mine car is measured by taking the central line of the track as the standard, and the overall loading width and the unbalanced loading condition of the mine car are distinguished; the loading height is measured by taking the height of the rail surface as a reference; the loading length is based on the integral loading length, and the mine car exceeding the standard data is considered to be a four-super mine car and is determined to be abnormal.
Preferably, the personnel body detection system is connected with the cage emergency unlocking switch of the upper well and the lower well, when the personnel with articles forbidden and the drinking personnel are detected, the cage entrance gate of the upper well and the lower well cannot be automatically opened, and simultaneously, the voice alarm is given out, the personnel body detection system and the cage are interlocked in place, and the personnel entering the cage is limited.
Preferably, the safety door personnel identification is connected with the cage safety door system, the safety door personnel identification confirms that no personnel are near the safety door, the cage safety door can be closed, and an emergency unlocking switch is arranged between the safety door personnel identification and the cage lifting system.
The invention has the advantages that: the reciprocating dispatching of the car pusher is reduced through the reasonable arrangement of the car pusher on the track, and the field operation of a wellhead hook holder is reduced;
the invention designs on-site monitoring remote operation, is linked with the existing signal car operating system, automatically realizes car pusher operation when lifting objects, and lifts objects to send different driving signals, thereby realizing intelligent operation of auxiliary well signals, hooks and a car pusher and reducing on-site operators.
Drawings
Figure 1 is a layout view of an over-the-well track car puller of the present invention,
figure 2 is a layout view of a downhole rail car pusher of the present invention,
reference numerals: 1. cage, 2, go up the well head, 3, well head down, 4, left side double track on the well, 5, left side monorail on the well, 6, the many crooked tracks on the well of left side, 7, car pusher, 8, the left side double track in the pit, 9, the left side monorail in the pit, 10, the right side double track in the pit, 11, the right side monorail in the pit, 12, translation switch, 13, hydraulic pressure symmetry switch, 14, track scale, 15, visible light camera, 16, personnel examine the body system. 17 right side aboveground double track, 18 right side aboveground single track, 19 right side aboveground multi-bending track, 20 embracing rail type car arrester.
Detailed Description
The following further describes the present invention:
the invention relates to a signal catch hook control device for a trolley for an upper and a lower wellhead tracks of a coal mine auxiliary vertical shaft, which structurally comprises a wellhead upper track positioned above a vertical shaft and a wellhead lower track in the vertical shaft, wherein the wellhead upper track and the wellhead lower track in the vertical shaft are intersected at a cage position at a wellhead;
the upper well head track is divided into an upper left well track and an upper right well track at the position of a well head, the upper left well track and the upper right well track are respectively provided with an upper double track, an upper single track and an upper multi-bending track from the position of the well head to the far end, the upper double track, the upper single track and the upper multi-bending track are connected, and car pushers are respectively arranged on the upper double track, the upper single track and the upper multi-bending track;
the underground track is divided into an underground left track and an underground right track at the bottom of the well, the underground left track and the underground right track are respectively provided with an underground double track and an underground single track from the bottom of the well to the far end, and the underground double track and the underground single track are respectively provided with a car pusher.
In the invention, an aboveground double track and an aboveground single track of an aboveground left track are connected through a hydraulic symmetric turnout, the aboveground single track is connected with an aboveground multi-bending track through a translation turnout, the aboveground double track of the aboveground left track is two long-distance parallel tracks, rail-holding type car stoppers are respectively arranged at positions close to the end parts, a track scale is arranged on the aboveground single track of the aboveground left track, and the rail-holding type car stopper is arranged at the end part of the aboveground multi-bending track of the aboveground left track.
The two aboveground tracks of the right aboveground tracks are two straight-line crossed tracks and are connected with the aboveground single track through hydraulic turnouts, and the aboveground double tracks of the right aboveground tracks are not provided with car pushers.
According to the invention, an underground left side cross double-track, an underground left side single-track and an underground left side conveying track are respectively arranged on an underground left side track inwards from a wellhead position, an underground right side parallel double-track, an underground right side single-track and an underground right side conveying track are respectively arranged on an underground right side track inwards from a wellhead position, and car pushers are respectively arranged on the right side parallel double-track and the underground right side single-track.
In order to realize automatic safety inspection of personnel going into the well, a wellhead cage is provided with an upper-layer personnel entrance for installing a personnel inspection system and a safety door personnel identification system.
Personnel examine the system and carry forbidden article and alcohol detection to the personnel of going into the well, and emergency exit personnel identification system includes camera and infrared sensor, gathers the image information of well head emergency exit department in real time, and emergency exit personnel identification system's server detects the image, realizes reducing well head operating personnel about vice vertical shaft through intelligent technology and thing networking control technique. The number of the personnel entering and exiting the Shanxi closed area is identified and counted, the in-place state of the safety door is identified and detected, and the safety inspection of workers on the well descending site is improved.
The specific implementation mode is that when people with articles forbidden and people drinking wine are met, the cage entrance gate cannot be automatically opened, and meanwhile, a voice alarm is given out. The personnel checking system is interlocked with the large and small cage in place to limit personnel entering the cage. The gate of the body detecting system can be opened only after the cage is in place. The number of people for entering the large tank is 37, the number of people for entering the small tank is 20, when the number of people for entering the small tank reaches the upper limit, the gate is automatically closed, and an alarm signal that the personnel are full and the tank is strictly forbidden is sent out.
The camera and the infrared sensor are deployed at the wellhead safety door, so that image information at the wellhead safety door is acquired in real time, and the server analyzes and processes the image in real time to detect the retention condition of personnel at the safety door. The system automatically closes the safety door, confirms that no personnel are near the safety door, and can close the door to ensure the safety of the personnel. And an emergency unlocking switch is arranged, so that various emergency situations can be conveniently handled.
In the invention, in order to realize detection after the mine is put into the well, a visible light camera is arranged at the track scale on the single track on the left track on the well, the visible light camera identifies the mine car on the track by taking the track central line, the track surface height and the single vehicle center as the reference, and can respectively measure the length, the width and the height of the mine car, and when the visible light camera detects that the mine car is abnormal, the mine single track upper cart machine on the left track on the well returns the abnormal mine car to the empty track of the multi-bending track on the well from the translation turnout. Measuring the loading width of the mine car by taking the central line of the track as a reference, and distinguishing the whole loading width and the unbalanced load condition of the mine car; the loading height is measured by taking the height of the rail surface as a reference; the loading length is based on the integral loading length, and the mine car exceeding the standard data is considered to be a four-super mine car and is determined to be abnormal.
For a four-super mine car, a right single-rail push-up machine is used for returning the four-super vehicle to an empty lane of a left curved rail from a translation turnout.
The mining general intrinsic safety industrial personal computer at the upper part of the well and the mining explosion-proof computer at the lower part of the well are communicated with the personnel inspection system and the safety door personnel identification system through cables, the mining general intrinsic safety industrial personal computer at the upper part of the well and the mining explosion-proof computer at the lower part of the well perform data interaction with the background control server, and the personnel inspection system and the safety door personnel identification system identify the acquired state.
And performing data interaction with a high-performance operation server through personnel identification of the safety door, acquiring a target identification state, and monitoring the running state and the action state of each device at the well head in real time. Meanwhile, through accessing the server database, the data playback, viewing and tracking can be performed on the identification, detection and control of the historical operation process in the system according to the time dimension and the region dimension.
The personnel detection system is connected with the cage emergency unlocking switch of the upper well and the lower well, when the personnel with articles forbidden and the personnel for drinking are detected, the cage entrance gate of the upper well and the lower well cannot be automatically opened, and simultaneously, the voice alarm is given out, the personnel detection system and the cage are interlocked in place, and the personnel entering the cage is limited. The safety door personnel identification is connected with the cage safety door system, personnel nearby the safety door can be identified by the safety door personnel identification, the cage safety door can be closed, and an emergency unlocking switch is arranged between the safety door personnel identification and the cage lifting system.
The safety door personnel identification system monitors whether personnel break into the safety door through an anti-explosion camera. The monitoring time sequence is as follows: when the system receives that the car pusher acts in the area, whether the person exists or not is monitored through real-time video, when the car pusher in the area is monitored to be in a working state and the person walks in the area, the system sends out a voice alarm of 'car pusher running and pedestrian prohibition', the operator is warned that the person intrudes, safety accidents are avoided, and safety production in the car pushing process is guaranteed.
The deployment mode is as follows: go up the well head shallow regional utilization and make pedestrian's discernment monitoring with the sea health appearance of making a video recording of using, arrange 2 explosion-proof cameras in the yard of leaving a bus, realize regional coverage. 2 explosion-proof cameras are arranged at two ends of an upper wellhead cart yard area at a lower wellhead, personnel passing through the area are calculated and counted, and when the cart pusher is in a working state, if the number of the counted personnel in the area is not 0, the system outputs voice alarm. 2 explosion-proof cameras are arranged in a well head exit area, and whether pedestrians are resident or not when the car pusher is monitored to be lowered is ensured to ensure production safety.
The car pusher is used for prolonging the car pushing of the shaft mouth car entering field and the car operating area on the auxiliary vertical shaft, the improvement can be realized on the existing equipment, the rail weighbridge does not need to be moved, and the construction amount is correspondingly reduced; the pneumatic common left turnout is replaced by a hydraulic translation turnout, so that the car pusher can pass through the turnout, and unqualified vehicles can conveniently return to an empty line through the translation turnout; the hydraulic common symmetrical turnout is replaced by the hydraulic turnout, the operation is more convenient and efficient, and the transportation efficiency of the departure area is improved. The invention is also improved from the signal control equipment, and the operation efficiency is improved.
Claims (10)
1. A signal hook control device for a trolley on a track of an upper wellhead and a lower wellhead of a coal mine auxiliary vertical shaft is characterized by comprising,
the upper wellhead track and the lower wellhead track in the shaft are intersected at the position of a cage at the wellhead;
the upper well head track is divided into an upper left well track and an upper right well track at the position of a well head, the upper left well track and the upper right well track are respectively provided with an upper double track, an upper single track and an upper multi-bending track from the position of the well head to the far end, the upper double track, the upper single track and the upper multi-bending track are connected, and car pushers are respectively arranged on the upper double track, the upper single track and the upper multi-bending track;
the underground track is divided into an underground left track and an underground right track at the bottom of the well, the underground left track and the underground right track are respectively provided with an underground double track and an underground single track from the bottom of the well to the far end, and the underground double track and the underground single track are respectively provided with a car pusher.
2. The signal hook control device of the coal mine auxiliary vertical shaft upper and lower wellhead track trolley is characterized in that an aboveground double track and an aboveground single track of an aboveground left track are connected through hydraulic symmetrical turnouts, the aboveground single track is connected with an aboveground multi-bending track through translation turnouts, the aboveground double track of the aboveground left track is two long-distance parallel tracks, rail holding type car stoppers are respectively arranged at positions close to the end parts, a track scale is arranged on the aboveground single track of the aboveground left track, and the rail holding type car stoppers are arranged at the end parts of the aboveground multi-bending track of the aboveground left track.
3. The signal hook control device for the rail trolley for the upper and lower wellheads of the auxiliary vertical shaft of the coal mine as claimed in claim 2, wherein the two aboveground rails of the right aboveground rail are two rails which are crossed linearly and are connected with the single aboveground rail through hydraulic turnouts, and the two aboveground rails of the right aboveground rail are not provided with a car pusher.
4. The signal grappling control device for the trolley for the upper and lower wellhead rails of the auxiliary vertical shaft of the coal mine according to claim 1, wherein the underground left side rail is internally provided with an underground left side cross double rail, an underground left side single rail and an underground left side conveying rail from a wellhead position, the underground right side rail is internally provided with an underground right side parallel double rail, an underground right side single rail and an underground right side conveying rail from a wellhead position, and the right side parallel double rail and the underground right side single rail are respectively provided with a trolley pusher.
5. The coal mine auxiliary vertical shaft upper and lower wellhead track trolley signal grappling control device as claimed in claim 1, further comprising a wellhead cage, wherein an upper personnel entrance is arranged at the wellhead cage, a personnel detection system and a safety door personnel identification system are installed, the personnel detection system carries forbidden articles and alcohol detection to personnel going down the shaft, the safety door personnel identification system comprises a camera and an infrared sensor, image information at the wellhead safety door is collected in real time, and a server of the safety door personnel identification system analyzes and processes the images in real time to detect the retention condition of the personnel at the safety door.
6. The signal hook control device for the rail tramcar of the upper and lower wellheads of the auxiliary vertical shaft of the coal mine as claimed in claim 2, wherein a visible light camera is arranged at the rail weighbridge on the single rail on the shaft of the left rail on the shaft, the visible light camera identifies the tramcar on the rail by taking the center line of the rail, the height of the rail surface and the center of a single vehicle as references and can respectively measure the length, the width and the height of the tramcar, and when the visible light camera detects that the tramcar is abnormal, the tramcar on the single rail on the shaft on the left rail on the shaft returns the abnormal tramcar to an empty line of the multi-bending rail on the shaft from the translation turnout.
7. The signal grappling control device for the track trolley for the upper and lower wellheads of the auxiliary vertical shaft of the coal mine according to claim 5 or 6, wherein a general intrinsic safety industrial personal computer for the mine is arranged at an uphole position, a flame-proof computer for the mine is arranged at a downhole position, the general intrinsic safety industrial personal computer for the mine at the uphole position and the flame-proof computer for the mine at the downhole position are communicated with a personnel detection system and a safety gate personnel identification system through cables, the general intrinsic safety industrial personal computer for the mine at the uphole position and the flame-proof computer for the mine at the downhole position perform data interaction with a background control server, and the personnel detection system and the safety gate personnel identification system identify the acquired state.
8. The signal hook control device for the rail tramcar trolley on the upper wellhead and the lower wellhead of the coal mine auxiliary vertical shaft according to claim 6, characterized in that the loading width of the tramcar is measured by taking the central line of the rail as the reference, so as to distinguish the whole loading width and the unbalanced loading condition of the tramcar; the loading height is measured by taking the height of the rail surface as a reference; the loading length is based on the integral loading length, and the mine car exceeding the standard data is considered to be a four-super mine car and is determined to be abnormal.
9. The signal hook control device for the rail cart for the upper and lower wellheads of the auxiliary vertical shaft of the coal mine as claimed in claim 5, wherein the personnel detection system is connected with a cage emergency unlocking switch of the upper and lower shafts, when the personnel with articles forbidden and drinking personnel are detected, a cage entrance gate of the upper and lower shafts cannot be automatically opened, a voice alarm is given, and the personnel detection system and the cage are interlocked in place to carry out the entering of a cage limiter.
10. The signal hook control device for the rail trolley for the upper and lower wellheads of the auxiliary vertical shaft of the coal mine according to claim 5, wherein personnel identification of the safety door is connected with a safety door system of the cage, the personnel identification of the safety door confirms that no personnel is near the safety door, so that the safety door of the cage can be closed, and an emergency unlocking switch is arranged between the personnel identification of the safety door and the cage lifting system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111513193.7A CN114165285A (en) | 2021-12-12 | 2021-12-12 | Signal handle hook control device for trolley on upper and lower wellhead tracks of coal mine auxiliary vertical shaft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111513193.7A CN114165285A (en) | 2021-12-12 | 2021-12-12 | Signal handle hook control device for trolley on upper and lower wellhead tracks of coal mine auxiliary vertical shaft |
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