Coal mine gob-side entry retaining supporting device

Abstract

The invention is used for the technical field of coal mine entry retaining supporting, and particularly discloses a coal mine gob-side entry retaining supporting device which comprises a sleeper, stand columns are arranged on the two sides of the sleeper, a first top frame and a second top frame are fixedly installed on the outer surface of an upper supporting barrel, and rolling wheels are rotatably installed on the outer surfaces of the ends, close to the sleeper, of the stand columns. According to the supporting device for the gob-side entry retaining of the coal mine, after the gob-side entry retaining of the coal mine is prolonged, the supporting device only needs to be assembled outside a coal mine pit, and then the supporting device can be transported through the erected sleepers and rails, so that the supporting device moves above the rails through the rollers; due to the inclined design of the rolling wheels, the probability that the supporting device falls in the moving process can be reduced, the supporting device can be transported to a place where the supporting device needs to be erected, the supporting device can be far away from the sleeper and the track after being erected and installed, and a mine car can also be placed above the sleeper and the track for use.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine lane retaining support, in particular to a coal mine gob-side lane retaining support device. Background Art

[0002] Coal mines refer to mines that mine coal resources. They are an important energy source and are widely used in power generation, industrial production, heating and other fields. Coal mines are usually located underground. Coal is mined from coal seams through the excavation of coal mining faces and the operation of coal mining equipment. For this reason, it is necessary to adopt coal mine goaf-retaining technology to improve the coal recovery rate, reduce the mining ratio, improve the ventilation of the working face, reduce the cost of goaf maintenance, ease the tension of mining and excavation succession and improve the utilization rate of mine resources. For this reason, support devices are needed to support the goaf-retaining technology of coal mines. The current coal mine goaf-retaining support devices need to continue to extend the support distance forward as the mining work progresses. However, since the support equipment is relatively tall, it is inconvenient to move and assemble it, and it is not easy to erect and assemble the support device. Summary of the invention

[0003] The object of the present invention is to provide a coal mine gob-side lane retaining support device to solve the problem in the above-mentioned background technology that the support device is difficult to move, erect and assemble.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coal mine goaf-retaining lane support device, comprising a sleeper, columns are arranged on both sides of the sleeper, and an upper support barrel is slidably installed on one end of the column away from the sleeper, the column does not fit the outer surface of the sleeper, and a first top frame and a second top frame are fixedly installed on the outer surface of the upper support barrel, and the sleeper is placed and buried in the ground.

[0005] Preferably, a rolling mechanism is arranged between the sleeper and the column, and the rolling mechanism comprises: a roller, which is rotatably mounted on the outer surface of one end of the column close to the sleeper, and tracks are fixedly mounted on the outer surfaces of both ends of the sleeper, the outer surface of the track fits with the outer surface of the roller, and the roller is designed to be inclined.

[0006] By adopting the above technical solution, the roller is designed to be inclined so that it can move on the outer surface of the track without falling, and the weight of the track and the support device can be shared by the sleepers, and the assembled support device can be transported by the track, so that the support device can be assembled outside the mine, reducing the difficulty of assembly, facilitating the extension and support of the coal mine along the empty lanes, and after the support device is erected and installed, the sleepers and tracks can be used to erect mine cars for use.

[0007] Preferably, a rotating engagement mechanism is provided inside the column, and the supporting device can be retracted and extended through the rotating engagement mechanism, so that the supporting device can be fixed conveniently and the supporting device will not automatically retract.

[0008] By adopting the above technical solution, the self-locking property of the worm gear and the worm can prevent the support device from automatically shrinking due to pressure after the erection is completed, so that the support device cannot be displaced after the assembly and erection is completed.

[0009] Preferably, the rotating engagement mechanism includes: a worm gear screw, which is rotatably installed inside the column, and a lower support leg is slidably installed inside the column, the lower support leg, the upper support barrel and the worm gear screw are concentrically designed, the threads at both ends of the worm gear screw turn in opposite directions, and the worm gear screw is threadedly connected to the upper support barrel and the lower support leg, and the upper support barrel and the lower support leg are respectively engaged with the column, and the outer surface of the lower support leg is evenly provided with spikes, and a worm is rotatably installed on the outer surface of the column, and the worm is meshed with the worm gear screw.

[0010] By adopting the above technical solution, the worm can be twisted with an electric wrench so that the worm wheel screw meshing with the worm can rotate together, allowing the upper support barrel and the lower support leg to extend from the column at the same time, allowing the lower support leg to support the ground, and allowing the upper support barrel to hold up the first top frame and the second top frame, so that the first top frame and the second top frame can contact the top of the tunnel along the air, so that the support device can be conveniently fixed and erected.

[0011] Preferably, a sliding thread mechanism is provided between the upper support barrels, and the distance between the columns can be conveniently adjusted through the sliding thread mechanism so that the columns can fit with the side walls of the gob-side lanes in the coal mine.

[0012] By adopting the above technical solution, the columns and rollers can be moved, the rollers can be separated from the outer surface of the track, and the columns can be fitted with the side surface of the coal mine along the empty lane, so that the side surface of the coal mine along the empty lane will not collapse.

[0013] Preferably, the sliding thread mechanism includes: a first top frame, the first top frame is fixedly mounted on the outer surface of an upper support barrel, a pitch-adjusting screw is threadedly mounted on the outer surface of the first top frame, and a second top frame is threadedly mounted on the other end of the pitch-adjusting screw, and the second top frame is fixedly mounted on the outer surface of another upper support barrel, guide support rods are fixedly mounted on the outer surfaces of the first top frame and the second top frame, and the guide support rods respectively penetrate the outer surfaces of the first top frame and the second top frame, and the second top frame, the first top frame and the guide support rod are slidably connected, second nuts are threadedly mounted on the outer surfaces of both ends of the pitch-adjusting screw, and the outer surfaces of the second nuts are respectively fitted with the outer surfaces of the first top frame and the second top frame, side baffles are slidably inserted between the columns, and the outer surfaces of the side baffles are fitted with the outer surfaces of the side walls of the coal mine goaf.

[0014] By adopting the above technical solution, when the support device is moved to the location where it needs to be erected, the pitch-adjusting screw can be rotated. The rotation of the pitch-adjusting screw allows the first top frame and the second top frame to move to both sides, and the support between the first top frame and the second top frame during movement is strengthened by the guide support rod. Subsequently, the position of the pitch-adjusting screw can be fixed by tightening the second nut, so that the first top frame and the second top frame can move with the column after moving, so that the column and the side baffle can be close to the side wall of the coal mine's empty lane, so that the device can be laterally fixed and prevent the side collapse of the coal mine's empty lane.

[0015] Preferably, a dimensional groove is provided on the outer surface of the upper support barrel, and anti-slip teeth are provided on the outer surface of the dimensional groove. A mounting sleeve is slidably installed on the outer surface of the upper support barrel, and the mounting sleeve is engaged with the upper support barrel. A screw assembly is threadedly installed on the side surface of one end of the mounting sleeve, and a top block is rotatably installed on one end of the screw assembly. The mounting sleeve is slidably connected to the top block, and the top block is engaged with the dimensional groove.

[0016] By adopting the above technical scheme, the position of the installation sleeve can be fixed by the dimensional groove on the outer surface of the upper support barrel, and by tightening the screw assembly, the top block can be pushed against the outer surface of the dimensional groove, and the anti-slip teeth provided on the outer surface of the dimensional groove fit with the top block, so that the installation sleeve can be fixed on the outer surface of the upper support barrel, so that after the support device is installed and erected, the height of the installation sleeve can be adjusted according to the height of the support device to adjust the support angle of the connecting rod and the threaded barrel.

[0017] Preferably, the outer surfaces of the upper support barrel and the first top frame and the second top frame are provided with threaded support mechanisms, and the supporting force of the first top frame and the second top frame is improved by the threaded support mechanisms.

[0018] By adopting the above technical solution, the supporting force of the first top frame and the second top frame can be improved, and the probability of damage to the supporting device can be reduced.

[0019] Preferably, the threaded support mechanism includes: a threaded barrel, a connecting rod is threadedly installed on both ends of the threaded barrel, and the connecting rod is rotatably installed on the outer surfaces of the mounting sleeve, the first top frame and the second top frame at both ends, a first nut is threadedly installed on the outer surface of the connecting rod, and the outer surface of the first nut is fitted with the outer surface of the threaded barrel, and a third nut is threadedly installed on the outer surfaces of both sides of the first top frame and the second top frame, and the outer surface of the third nut is fitted with the outer surface of the connecting rod.

[0020] By adopting the above technical solution, the third nut can be screwed into both sides of the first top frame and the second top frame, the connecting rod can be fixed on both sides of the first top frame and the second top frame respectively, and the distance between the connecting rods can be adjusted by rotating the threaded barrel. Then, the length of the connecting rod and the threaded barrel can be fixed by the first nut, so that the length of the connecting rod and the threaded barrel can be easily adjusted, and the connecting rod can be conveniently connected to the first top frame and the second top frame.

[0021] Preferably, hooks are fixedly installed on the outer surfaces of both ends of the first top frame and the second top frame, and an anti-fall net is hung on the outer surfaces of the hooks. Connecting screws are penetrated through the outer surfaces of the first top frame and the second top frame, and the connecting screws are slidingly connected to the first top frame and the second top frame. A fourth nut is threadedly installed on the outer surface of the connecting screw, and the outer surfaces of the fourth nut are respectively fitted with the outer surfaces of the first top frame and the second top frame, and a connecting barrel is threadedly installed between the connecting screws.

[0022] By adopting the above technical solution, the anti-fall net can be easily erected through hooks, so that the ore and coal slag falling on the empty tunnels in the coal mine will not directly fall on people's heads, reducing the risk of people being injured when passing through. The first top frame and the second top frame can be easily assembled and connected through the connecting screw and the fourth nut, and the connecting screw can be easily assembled through the connecting barrel, so that the support device can be assembled and connected together after the erection is completed.

[0023] Preferably, a gas detector is fixedly mounted on the outer surface of one side of the second top frame close to the sleeper, and an audible and visual alarm is fixedly mounted on the outer surface of one side of the first top frame close to the sleeper, and the audible and visual alarm is connected to the gas detector.

[0024] By adopting the above technical scheme, the concentration of harmful gases in the coal mine can be monitored by the gas detector arranged on the outer surface of the second top frame. When the concentration of harmful gases is too high, the gas detector will detect fluctuations and activate the sound and light alarm to remind and warn the operators. The gas detector and the sound and light alarm are arranged below the first top frame and the second top frame, which can protect the gas detector and the sound and light alarm and prevent them from being damaged by falling rocks.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the coal mine gob-side lane retaining support device:

[0026] 1. After the extension of the gob-side tunnel in the coal mine, the support device only needs to be assembled outside the coal mine pit, and then the support device can be transported through the erected sleepers and tracks, so that the support device can be moved above the track through rollers, and the inclined design of the rollers can reduce the probability of the support device falling during the movement, so that the support device can be transported to the location where it needs to be erected, and the support device will be away from the sleepers and tracks after the erection and installation is completed, so that the mine car can also be placed above the sleepers and tracks for use;

[0027] 2. After the support device is transported to the location where it needs to be erected, it is only necessary to turn the pitch-adjusting screw to move the first top frame, the second top frame and the column together, so that the column, the first top frame and the second top frame can simultaneously push against the outer surfaces of both sides of the gob-retained lane in the coal mine, so that the first top frame, the second top frame and the column can be moved, extended and fixed, and then the position of the pitch-adjusting screw can be fixed by the second nut, and the connection strength between the first top frame and the second top frame can be enhanced by the guide support rod and the pitch-adjusting screw, so that the first top frame and the second top frame can be easily opened and erected, and the side baffles can be used to prevent the side surface of the gob-retained lane in the coal mine from collapsing;

[0028] 3. After the first top frame, the second top frame and the column are opened for support, an electric wrench can be inserted into the outer surface of the worm, and the rotation of the worm drives the worm gear screw to rotate, so that the worm gear screw can simultaneously push the upper support barrel and the lower support leg to move, so that the upper support barrel and the lower support leg can be extended from the column, so that the lower support leg can contact the ground, and the spikes evenly arranged on the outer surface of the lower support leg can reduce the chance of the lower support leg slipping, and the first top frame and the second top frame can be pushed by the upper support barrel and lean against the top of the coal mine goaf for support, so that the support device can be easily erected to prevent the top of the coal mine goaf from collapsing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the sleeper and the track of the present invention;

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the gas detector and the sound and light alarm of the present invention;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the track and roller of the present invention;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting screw and the connecting barrel of the present invention;

[0033] Figure 5It is a schematic diagram of the three-dimensional structure of the anti-falling net and the side baffle of the present invention;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the upper support barrel and the lower support leg of the present invention;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the worm gear, screw and worm of the present invention;

[0036] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure of the first top frame and the second top frame of the present invention;

[0037] Fig. 9 It is a schematic diagram of the cross-sectional three-dimensional structure of the upper support barrel and the lower support leg of the present invention;

[0038] Fig.10 This is a schematic diagram of the cross-sectional three-dimensional structure of the installation of the sliding sleeve and the screw assembly of the present invention.

[0039] In the figure: 1. sleeper; 2. track; 3. column; 4. roller; 5. worm screw; 6. worm; 7. upper support barrel; 8. lower support leg; 9. first top frame; 10. second top frame; 11. guide support rod; 12. dimension groove; 13. mounting sleeve; 14. screw assembly; 15. top block; 16. connecting rod; 17. threaded barrel; 18. first nut; 19. hook; 20. anti-fall net; 21. pitch adjusting screw; 22. second nut; 23. third nut; 24. connecting screw; 25. connecting barrel; 26. fourth nut; 27. side baffle; 28. gas detector; 29. ​​sound and light alarm. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-10 The present invention provides a technical solution: a coal mine goaf-retaining lane support device, comprising a sleeper 1, columns 3 are arranged on both sides of the sleeper 1, and an upper support barrel 7 is slidably installed on one end of the column 3 away from the sleeper 1, the column 3 does not fit the outer surface of the sleeper 1, and the outer surface of the upper support barrel 7 is respectively fixedly installed with a first top frame 9 and a second top frame 10, the sleeper 1 is placed and buried in the ground, and a rolling mechanism is arranged between the sleeper 1 and the column 3, and the rolling mechanism comprises: a roller 4, the roller 4 is rotatably installed on the outer surface of one end of the column 3 close to the sleeper 1, and tracks 2 are fixedly installed on the outer surfaces of both ends of the sleeper 1, the outer surface of the track 2 fits the outer surface of the roller 4, and the roller 4 is designed to be inclined.

[0042] The track 2 can be fixed by burying the sleeper 1, so that the weight of the track 2 and the supporting device can be dispersed by the sleeper 1, so that the sleeper 1 and track 2 can be added and installed when the coal mine is extended, so that the supporting device can be assembled outside the mine and transported by the roller 4 and the track 2. The inclined design of the roller 4 prevents the roller 4 from falling off the track 2 when moving, so that the supporting device can be transported to the location where it needs to be installed, and after the support device is installed, the sleeper 1 and the track 2 can be used to place the mine car.

[0043] A rotating engagement mechanism is provided inside the column 3, through which the support device can be retracted and extended, which is convenient for fixing the support device and prevents the support device from automatically retracting. The rotating engagement mechanism includes: a worm gear screw 5, which is rotatably installed inside the column 3, and a lower support leg 8 is slidably installed inside the column 3. The lower support leg 8, the upper support barrel 7 and the worm gear screw 5 are concentrically designed, and the threads at both ends of the worm gear screw 5 turn in opposite directions, and the worm gear screw 5 is threadedly connected to the upper support barrel 7 and the lower support leg 8, and the upper support barrel 7 and the lower support leg 8 are respectively engaged with the column 3, and the outer surface of the lower support leg 8 is evenly provided with spikes, and a worm 6 is rotatably installed on the outer surface of the column 3, and the worm 6 is meshed with the worm gear screw 5.

[0044] After the supporting device contacts the outer surfaces of both sides of the coal mine goaf, the worm 6 can be screwed by an electric wrench, so that the worm 6 can drive the worm gear screw 5 to rotate together, so that the worm gear screw 5 can push the upper support barrel 7 and the lower support leg 8 to extend from the column 3, so that the lower support leg 8 can contact the ground, and the spikes on the outer surface of the lower support leg 8 can be inserted into the ground to reduce the probability of the supporting device slipping and tipping over, and the upper support barrel 7 will push the first top frame 9 and the second top frame 10 to move, so that the outer surfaces of the first top frame 9 and the second top frame 10 can contact the top of the coal mine goaf, so that the supporting device can support the top of the coal mine goaf to prevent the top from collapsing, which is convenient for supporting and erecting the supporting device.

[0045] A sliding thread mechanism is provided between the support barrels 7, and the distance between the columns 3 can be conveniently adjusted through the sliding thread mechanism, so that the columns 3 can fit with the side wall of the gob-retained lane in the coal mine. The sliding thread mechanism includes: a first top frame 9, the first top frame 9 is fixedly mounted on the outer surface of the upper support barrel 7, the outer surface of the first top frame 9 is threadedly mounted with a pitch-adjusting screw 21, and the other end of the pitch-adjusting screw 21 is threadedly mounted with a second top frame 10, and the second top frame 10 is fixedly mounted on the outer surface of another upper support barrel 7, and the first top frame 9 and the second top frame 10 are fixedly mounted on the outer surface of the other upper support barrel 7. A guide support rod 11 is fixedly installed on the outer surface, and the guide support rod 11 passes through the outer surfaces of the first top frame 9 and the second top frame 10 respectively, and the second top frame 10, the first top frame 9 and the guide support rod 11 are slidably connected, and the outer surfaces of the two ends of the pitch adjusting screw 21 are threadedly installed with second nuts 22, and the outer surfaces of the second nuts 22 are respectively fitted with the outer surfaces of the first top frame 9 and the second top frame 10, and a side baffle 27 is slidably inserted between the columns 3, and the outer surface of the side baffle 27 is fitted with the outer surface of the side wall of the coal mine along the empty lane.

[0046] After the support device moves to the installation location along the direction of the track 2 through the roller 4, the pitch-adjusting screw 21 can be rotated. The rotation of the pitch-adjusting screw 21 pushes the column 3, the first top frame 9 and the second top frame 10 to both sides, so that the first top frame 9 and the second top frame 10 can move along the direction of the guide support rod 11. The guide support rod 11 and the pitch-adjusting screw 21 can enhance the connection strength between the first top frame 9 and the second top frame 10, so that the column 3, the first top frame 9 and the second top frame 10 can move and lean against the outer surfaces of both sides of the coal mine along the empty lane. After that, the rotating worm 6 can be rotated, and the position of the pitch-adjusting screw 21 can be fixed by the second nut 22. The distance between the columns 3 can be limited by inserting the side baffle 27 into the distance between the columns 3, and the side baffle 27 can be used to prevent the side of the coal mine along the empty lane from collapsing and falling stones, so that the support device can support the side of the coal mine along the empty lane to prevent side collapse, which is convenient for supporting and erecting the support device.

[0047] A standard groove 12 is provided on the outer surface of the upper support barrel 7, and anti-slip teeth are provided on the outer surface of the standard groove 12. A mounting sleeve 13 is slidably installed on the outer surface of the upper support barrel 7, and the mounting sleeve 13 is engaged with the upper support barrel 7. A screw assembly 14 is threadedly installed on the side surface of one end of the mounting sleeve 13, and a top block 15 is rotatably installed on one end of the screw assembly 14. The mounting sleeve 13 and the top block 15 are slidably connected, and the top block 15 is engaged with the standard groove 12.

[0048] The dimensional groove 12 opened on the outer surface of the upper support barrel 7 can limit the position of the installation sleeve 13 to prevent the installation sleeve 13 from rotating and deviating during use, and the rotation of the screw assembly 14 can push the top block 15 to slide inside the installation sleeve 13, so that the top block 15 can move and engage with the anti-slip teeth on the outer surface of the dimensional groove 12, so that the support device can adjust the position of the installation sleeve 13 on the upper support barrel 7 according to the height of the coal mine along the empty lane.

[0049] A threaded support mechanism is provided on the outer surfaces of the upper support barrel 7 and the first top frame 9 and the second top frame 10, and the supporting force of the first top frame 9 and the second top frame 10 is improved by the threaded support mechanism. The threaded support mechanism includes: a threaded barrel 17, and the two ends of the threaded barrel 17 are threadedly installed with a connecting rod 16, and the connecting rod 16 is rotatably installed on the outer surfaces of the mounting sleeve 13 and the two ends of the first top frame 9 and the second top frame 10 respectively, the outer surface of the connecting rod 16 is threadedly installed with a first nut 18, and the outer surface of the first nut 18 is in contact with the outer surface of the threaded barrel 17, and the outer surfaces of the first top frame 9 and the second top frame 10 are threadedly installed with a third nut 23, and the outer surface of the third nut 23 is in contact with the outer surface of the connecting rod 16.

[0050] After the top and both sides of the supporting device are fixed, opened and erected, the threaded barrel 17 can be rotated to extend the length of the connecting rod 16, so that one end of the connecting rod 16 can be inserted into both sides of the first top frame 9 and the second top frame 10, and the connecting rod 16 can be fixed by the third nut 23. Then, the length of the connecting rod 16 can be fixed by the first nut 18, so that the connecting rod 16 and the threaded barrel 17 can provide additional support force for the first top frame 9 and the second top frame 10, thereby reducing the probability of damage to the first top frame 9 and the second top frame 10.

[0051] Hooks 19 are fixedly installed on the outer surfaces of both ends of the first top frame 9 and the second top frame 10, and the outer surfaces of the hooks 19 are penetrated by a falling prevention net 20, and the outer surfaces of the first top frame 9 and the second top frame 10 are penetrated by a connecting screw 24, and the connecting screw 24 is slidingly connected to the first top frame 9 and the second top frame 10, and the outer surface of the connecting screw 24 is threadedly installed with a fourth nut 26, and the outer surfaces of the fourth nut 26 are respectively fitted with the outer surfaces of the first top frame 9 and the second top frame 10, and a connecting barrel 25 is threadedly installed between the connecting screws 24.

[0052] The anti-fall net 20 can be set up by the hooks 19 arranged on the outer surfaces of both sides of the first top frame 9 and the second top frame 10, so that the anti-fall net 20 can intercept the ore falling from the top of the empty tunnel along the coal mine, reducing the risk of people being injured when passing by, and by screwing in the connecting screw 24 and the fourth nut 26, the support devices can be connected to each other for easy assembly and fixation, and the connecting screws 24 can be connected to each other through the connecting barrel 25.

[0053] A gas detector 28 is fixedly mounted on the outer surface of one side of the second top frame 10 close to the sleeper 1 , and an audible and visual alarm 29 is fixedly mounted on the outer surface of one side of the first top frame 9 close to the sleeper 1 , and the audible and visual alarm 29 is connected to the gas detector 28 .

[0054] The gas detector 28 can be used to detect harmful gases floating above the empty tunnels in the coal mine, so that workers working in the mine will not be poisoned, and the sound and light alarm 29 can be used to alarm and remind people working in the empty tunnels in the coal mine. The gas detector 28 and the sound and light alarm 29 are arranged under the first top frame 9 and the second top frame 10 to prevent falling debris from damaging the gas detector 28 and the sound and light alarm 29.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine gob retaining support device, comprising a sleeper (1), columns (3) are arranged on both sides of the sleeper (1), and an upper support barrel (7) is slidably mounted on one end of the column (3) away from the sleeper (1), the column (3) does not fit the outer surface of the sleeper (1), and a first top frame (9) and a second top frame (10) are fixedly mounted on the outer surface of the upper support barrel (7), respectively, and the sleeper (1) is placed and buried in the ground, characterized in that: A rolling mechanism is arranged between the rail sleeper (1) and the column (3), and the rolling mechanism comprises a roller (4), the roller (4) being rotatably mounted on the outer surface of one end of the column (3) close to the rail sleeper (1), and tracks (2) being fixedly mounted on the outer surfaces of both ends of the rail sleeper (1), the outer surface of the track (2) being in contact with the outer surface of the roller (4), and the roller (4) being of inclined design.

2. A coal mine gob-side entry retaining support device according to claim 1, characterized in that: The column (3) is provided with a rotating engagement mechanism inside, and the supporting device can be retracted and extended through the rotating engagement mechanism, so that the supporting device can be easily fixed and the supporting device will not automatically retract.

3. A coal mine gob-side entry retaining support device according to claim 1, characterized in that: The rotating meshing mechanism comprises: a worm screw (5), the worm screw (5) is rotatably mounted inside the column (3), and a lower support leg (8) is slidably mounted inside the column (3), the lower support leg (8), the upper support barrel (7) and the worm screw (5) are concentrically designed, the threads at both ends of the worm screw (5) turn in opposite directions, and the worm screw (5) is threadedly connected to the upper support barrel (7) and the lower support leg (8), and the upper support barrel (7) and the lower support leg (8) are respectively engaged with the column (3), and the outer surface of the lower support leg (8) is evenly provided with spikes, and a worm (6) is rotatably mounted on the outer surface of the column (3), and the worm (6) is meshed with the worm screw (5).

4. A coal mine gob-side entry retaining support device according to claim 1, characterized in that: A sliding thread mechanism is provided between the upper support barrels (7), and the distance between the columns (3) can be conveniently adjusted through the sliding thread mechanism, so that the columns (3) can fit with the side wall of the gob-side lane in the coal mine.

5. A coal mine gob-side entry retaining support device according to claim 4, characterized in that: The sliding thread mechanism comprises: a first top frame (9), the first top frame (9) is fixedly mounted on the outer surface of the upper support barrel (7), a pitch adjusting screw (21) is threadedly mounted on the outer surface of the first top frame (9), and a second top frame (10) is threadedly mounted on the other end of the pitch adjusting screw (21), and the second top frame (10) is fixedly mounted on the outer surface of another upper support barrel (7), and guide support rods (11) are fixedly mounted on the outer surfaces of the first top frame (9) and the second top frame (10), and the guide support rods (11) are respectively connected to the guide support rods (11) ... The first top frame (9) and the second top frame (10) are passed through the outer surfaces of the second top frame (10), and the second top frame (10), the first top frame (9) and the guide support rod (11) are slidably connected. The outer surfaces of both ends of the pitch-adjusting screw rod (21) are threadedly mounted with second nuts (22), and the outer surfaces of the second nuts (22) are respectively fitted with the outer surfaces of the first top frame (9) and the second top frame (10). A side baffle (27) is slidably inserted between the columns (3), and the outer surface of the side baffle (27) is fitted with the outer surface of the side wall of the coal mine goaf.

6. A coal mine gob-side entry retaining support device according to claim 1, characterized in that: The outer surface of the upper support barrel (7) is provided with a dimensional groove (12), and the outer surface of the dimensional groove (12) is provided with anti-slip teeth. The outer surface of the upper support barrel (7) is slidably mounted with a mounting sleeve (13), and the mounting sleeve (13) is engaged with the upper support barrel (7). A screw assembly (14) is threadedly mounted on the side surface of one end of the mounting sleeve (13), and a top block (15) is rotatably mounted on one end of the screw assembly (14). The mounting sleeve (13) and the top block (15) are slidably connected, and the top block (15) is engaged with the dimensional groove (12).

7. A coal mine gob-side entry retaining support device according to claim 6, characterized in that: The outer surfaces of the upper support barrel (7) and the first top frame (9) and the second top frame (10) are provided with threaded support mechanisms, and the support forces of the first top frame (9) and the second top frame (10) are increased by the threaded support mechanisms.

8. A coal mine gob-side entry retaining support device according to claim 7, characterized in that: The threaded support mechanism comprises: a threaded barrel (17), both ends of the threaded barrel (17) are threadedly mounted on a connecting rod (16), and the connecting rod (16) is rotatably mounted on the outer surfaces of the mounting sleeve (13), the first top frame (9) and the second top frame (10) at both ends, the outer surface of the connecting rod (16) is threadedly mounted with a first nut (18), and the outer surface of the first nut (18) is in contact with the outer surface of the threaded barrel (17), and the outer surfaces of both sides of the first top frame (9) and the second top frame (10) are threadedly mounted with a third nut (23), and the outer surface of the third nut (23) is in contact with the outer surface of the connecting rod (16).

9. A coal mine gob-side entry retaining support device according to claim 5, characterized in that: Hooks (19) are fixedly installed on the outer surfaces of both ends of the first top frame (9) and the second top frame (10), and an anti-falling net (20) is hung through the outer surface of the hook (19); a connecting screw (24) is penetrated through the outer surface of the first top frame (9) and the second top frame (10), and the connecting screw (24) is slidably connected to the first top frame (9) and the second top frame (10); a fourth nut (26) is threadedly installed on the outer surface of the connecting screw (24), and the outer surface of the fourth nut (26) is respectively in contact with the outer surface of the first top frame (9) and the second top frame (10); a connecting barrel (25) is threadedly installed between the connecting screws (24).

10. A coal mine gob-side entry retaining support device according to claim 9, characterized in that: A gas detector (28) is fixedly mounted on the outer surface of one side of the second top frame (10) close to the rail sleeper (1), and an audible and visual alarm (29) is fixedly mounted on the outer surface of one side of the first top frame (9) close to the rail sleeper (1), and the audible and visual alarm (29) is connected to the gas detector (28).

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