A cutting method for top cutting and pressure relief wire

Abstract

The present invention belongs to the technical field of coal mining, and specifically relates to a top-cutting and pressure-relieving wire cutting method, which is used for top-cutting coal rock roof, and the top-cutting is performed by a wire saw machine used for quarrying in a coal mine and a top-cutting drill vehicle. The top-cutting method can be respectively tangent or reverse tangent according to the cutting surface of the coal rock roof relative to the rope laying method of the wire saw machine. In the tangent method, the rope storage device added to the wire saw machine realizes the feeding of the diamond rope action surface by collecting the rope, and in the reverse tangent method, the lifting device pulls the wire rope to drag the stretching device upward to realize the feeding of the diamond rope action surface. The beneficial effect of the present invention is: by adopting the wire cutting method, the coal rock roof is continuously cut without affecting the normal production of the working face, so as to improve the coal mining efficiency and reduce the labor cost.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a top cutting pressure relief wire cutting method. Background Art

[0002] In recent years, the situation of major accidents and disasters in mines and environmental damage caused by coal mining has become increasingly severe. At present, the longwall mining method with coal pillars to protect the tunnels is dominant in coal mining, and the problems it faces are becoming more and more serious, such as difficulties in tunnel excavation and maintenance, frequent tunnel accidents and disasters, and waste of coal pillar resources. Coal-pillar-free mining is an effective way to solve these problems and an important means to achieve safe, efficient and green coal mining. Gob-side tunneling is an important way of coal-pillar-free mining and a major reform of coal mining technology. It can solve many major technical problems in coal mine production: gob-side tunneling can reduce the tunnel excavation rate, effectively ease the contradiction of mining and excavation continuity, and also reduce the danger of rock burst and gas outburst during tunnel excavation; gob-side tunneling can increase the coal recovery rate, make full use of the rational development of coal resources, extend the service life of the mine, and be conducive to the sustainable development of the mine; gob-side tunneling can realize continuous pressure relief mining without coal pillars, avoid the formation of isolated working faces due to skipping, and eliminate dynamic disasters such as rock burst caused by stress concentration in the upper and lower areas of the coal pillars.

[0003] The technology of "automatic lane formation by cutting top and unloading pressure" is the core of the "N00 method" proposed by Academician He Manchao. Since it was formally proposed in 2016 and officially tested at the S1201-II working face of Ningtiaota Coal Mine, it has been widely used. The key technologies of "automatic lane formation by cutting top and unloading pressure" are "cutting", "repairing", "protection" and "support". At present, "cutting" mainly adopts the method of drilling and blasting, which not only brings serious safety hazards, but also wastes time and effort. According to the statistics of Zhaogu Mining Area, each blasting takes 3-4 hours, including charging, connecting lines and evacuating people. According to the 8-meter coal cutting speed of Zhaogu No. 1 Mine, nearly 1 / 6 of the time is needed to blast and cut the top every day, which requires 6 people; Zhaogu No. 2 Mine has to blast 3 times every 5 days, which also requires nearly 1 / 6 of the time to blast and cut the top, which requires 6 people. Therefore, the development of a new cutting top process is an urgent problem to be solved in "automatic lane formation by cutting top and unloading pressure". Summary of the invention

[0004] In view of the above situation, the purpose of the present invention is to develop a top cutting and pressure relief wire cutting method, which uses wire cutting to continuously cut the coal rock roof without affecting the normal production of the working face, so as to improve coal mining efficiency and reduce labor costs.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A top cutting and pressure relief wire cutting method is used for top cutting of coal rock roof, and the top cutting is performed by combining a top cutting drill vehicle with a coal mine with a rope saw machine for quarrying. The top cutting method can be a tangent method or a reverse tangent method according to the cutting surface of the coal rock roof relative to the rope arrangement method of the rope saw machine;

[0007] The tangent method comprises the following steps:

[0008] S11. According to the designed top cutting width, two corresponding boreholes with a diameter of 160 to 200 mm are constructed on the coal rock top plate by using a drill rig on a top cutting drill vehicle for coal mines arranged in the mining tunnel. The diameter of the borehole matches the curvature radius of the diamond wire, and the distance between the two boreholes is 3500 to 4000 mm to match the power of the wire saw machine.

[0009] S12, using the support and guide device provided on the coal mine top cutting drill vehicle to arrange the diamond rope to the deepest part of the drill hole, so that the action surface of the diamond rope is closely attached to the cutting surface of the coal rock roof between the two drill holes;

[0010] S13, connecting the diamond wire to the body of the wire saw machine, and tensioning the diamond wire through the tensioning mechanism of the wire saw machine;

[0011] S14, starting the wire saw machine to make the diamond wire cut the coal rock roof along the cutting surface of the coal rock roof, and during the cutting process, using the wire storage device added to the wire saw machine to collect the wire, so as to keep the wire saw machine in normal working condition at all times;

[0012] S15, after the cutting is completed, the rope is released and the next operation cycle is prepared;

[0013] The reverse cutting method comprises the following steps:

[0014] S21. According to the designed cutting width, two holes with a diameter of 160 to 200 mm are drilled on the coal rock roof using a drill rig on a coal mine cutting drill vehicle arranged in the mining tunnel, and the distance between the two holes is 3500 to 4000 mm.

[0015] S22, using a support and guide device provided on a coal mine top cutting drill vehicle to arrange a steel wire rope with a tensioning device at the bottom to the deepest part of the borehole, wherein one end of the steel wire rope away from the tensioning device is connected to a lifting device, and the lifting device is fixed in a mining tunnel between two boreholes;

[0016] S23, connecting the diamond rope to the body of the wire saw machine, making the active surface of the diamond rope close to the cutting surface of the coal rock roof between the two drill holes through the stretching device, and tensioning the diamond rope through the tensioning mechanism of the wire saw machine;

[0017] S24, after the rope saw machine is started, the lifting device pulls up the diamond rope at a uniform speed through the wire rope traction and stretching device;

[0018] S25, releasing the rope through the rope storage device added to the rope saw machine to keep the rope saw machine in normal working condition;

[0019] S26, after cutting is completed, collect the rope and prepare for the next operation cycle.

[0020] Preferably, the support and guide device includes a support rod connected to the top of the coal mine cutting drill vehicle and a guide wheel rotatably connected to the top and bottom of the support rod; the guide wheel at the top of the support rod is rotatably connected to the guide wheel bracket, and the guide wheel bracket is rotatably connected to the top of the support rod through a transverse bearing, and the guide wheel can be made to swing a certain amplitude along the circumference of the support rod along with the diamond rope or the wire rope through the transverse bearing, thereby facilitating the adjustment of the diamond rope cutting position or the wire rope guiding position, and a guide wheel guard is also provided at the top of the support rod, and through holes for the diamond rope or the wire rope to pass through are provided on both sides of the guide wheel guard, and the provision of the guide wheel guard is conducive to providing safety protection for the guide wheel and ensuring the reliability of the device; when the tangent method is adopted, the guide wheel is used to provide a guiding effect for the diamond rope; when the reverse tangent method is adopted, the guide wheel is used to provide a guiding effect for the wire rope.

[0021] Preferably, the support rod adopts a hydraulic support to facilitate the support operation.

[0022] Preferably, the rope storage device includes a fixed frame, a movable frame and a telescopic mechanism, the fixed frame is connected to the body of the rope saw machine, both ends of the telescopic mechanism are respectively connected to the fixed frame and the movable frame, the fixed member and the movable frame are correspondingly provided with a plurality of groups of steering wheels, the diamond rope is sequentially wound between the plurality of groups of steering wheels on the fixed member and the movable frame, and the fixed frame and the movable frame are made to approach or move away from each other through the telescopic mechanism to realize the release or collection of the diamond rope.

[0023] Preferably, the telescopic mechanism adopts a telescopic oil cylinder or an electric telescopic rod, so that the storage operation of the diamond rope is more convenient.

[0024] Preferably, the stretching device includes two sliding wheels, which are rotatably connected to steel wire ropes in corresponding side drill holes respectively. One end of the two steel wire ropes away from the sliding wheels is connected to a lifting device. Through the traction of the lifting device, the steel wire ropes can drive the sliding wheels to move upward, thereby realizing the feeding of the diamond rope action surface.

[0025] Preferably, the lifting device adopts a winch, and the winch is driven electrically, hydraulically or pneumatically to achieve synchronous retraction and release of two steel ropes. When the winch is driven electrically, its driving device is an explosion-proof motor.

[0026] Preferably, the tensioning mechanism comprises a tensioning cylinder fixed on the body of the wire saw machine and a tensioning wheel rotatably connected to the telescopic end of the tensioning cylinder, wherein the tensioning wheel abuts against the side of the diamond wire away from the action surface to achieve rapid tensioning of the diamond wire.

[0027] The present invention also includes other components, devices or steps that enable it to be used normally, which are all conventional means in the field. In addition, devices or components not limited in the present invention, such as: top cutting drill vehicles for coal mines, rope saw machines for quarrying, etc., all adopt the existing technology in the field.

[0028] The working principle of the present invention is that in the tangential mode, the rope storage device realizes the feeding of the diamond rope action surface by collecting the rope, and in the reverse tangential mode, the lifting device drives the wire rope to drag the stretching device upward to realize the feeding of the diamond rope action surface.

[0029] The beneficial effect of the present invention is that the coal rock roof is continuously cut by wire cutting without affecting the normal production of the working face, so as to improve the coal mining efficiency and reduce the labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention in Example 1.

[0031] Figure 2 This is a schematic diagram of the overall structure of the present invention in Example 2.

[0032] Figure 3 Schematic diagram of the internal mechanism of the rope storage device in Example 1 and Example 2.

[0033] Figure 4 It is a schematic diagram of the structure of the tensioning mechanism in Example 1 and Example 2.

[0034] Figure 5 Schematic diagram of the connection structure of the guide wheel at the top end of the support rod in Example 1 and Example 2.

[0035] Figure 6 for Figure 5 Schematic diagram of the side structure. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0037] It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "inside", "outside", etc. are based on the drawings and are only for the convenience of description.

[0038] Example 1

[0039] like Figure 3 to Figure 6 and Figure 1 As shown, a top cutting and pressure relief wire cutting method provided by the present invention is used to cut the top of a coal rock roof 1, and the top cutting is performed by combining a coal mine top cutting drill 2 with a rope saw 3 for quarrying. The top cutting method adopts a tangent method according to the rope arrangement method of the cutting surface 8 of the coal rock roof relative to the rope saw, and includes the following steps:

[0040] S11. According to the designed top cutting width, two drill holes 5 with a diameter of 160 mm are constructed on the coal rock top plate by using the drill rig 6 on the top cutting drill vehicle arranged in the mining tunnel 4. The drill hole diameter is set to 160 mm to match the curvature radius of the diamond wire, and the distance between the two drill holes is 3500 mm to match the power of the wire saw machine.

[0041] S12, using the support and guide device provided on the coal mine top cutting drill vehicle to arrange the diamond rope 7 to the deepest part of the drill hole, so that the action surface of the diamond rope is closely attached to the cutting surface of the coal rock roof between the two drill holes;

[0042] S13, connecting the diamond wire to the body of the wire saw machine, and tensioning the diamond wire through the tensioning mechanism of the wire saw machine;

[0043] S14, start the wire saw machine to make the diamond wire cut the coal rock roof along the cutting surface of the coal rock roof, and use the wire storage device 9 added to the wire saw machine to collect the wire during the cutting process, so as to keep the wire saw machine in normal working state at all times;

[0044] S15, after the cutting is completed, the rope is released and the next operation cycle is prepared;

[0045] The supporting guide device includes a support rod 10 connected to the top of the coal mine cutting drill vehicle and a guide wheel 11 rotatably connected to the top and bottom of the support rod, and the diameter of the guide wheel is 130 mm. The guide wheel is used to provide a guide for the diamond rope. The guide wheel at the top of the support rod is rotatably connected to the guide wheel bracket 11-1, and the guide wheel bracket is rotatably connected to the top of the support rod through a transverse bearing 11-2. The guide wheel can swing along the circumference of the support rod with the diamond rope to a certain extent through the transverse bearing, so as to facilitate the adjustment of the cutting position of the diamond rope. A guide wheel guard 11-3 is also provided at the top of the support rod. Through holes for the diamond rope to pass through are provided on both sides of the guide wheel guard. By setting the guide wheel guard, it is beneficial to provide safety protection for the guide wheel and ensure the reliability of the device. The rope storage device includes a fixed frame 13, a movable frame 14 and a telescopic mechanism 15. The fixed frame is connected to the body of the rope saw machine. The two ends of the telescopic mechanism are respectively connected to the fixed frame and the movable frame. The fixed member and the movable frame are provided with a plurality of steering wheels 16 respectively. The diamond rope is wound between the plurality of steering wheels on the fixed member and the movable frame in sequence. The fixed frame and the movable frame are moved closer to or farther from each other through the telescopic mechanism to realize the release or collection of the diamond rope. The telescopic mechanism adopts a telescopic cylinder to make the storage operation of the diamond rope more convenient. The tensioning mechanism includes a tensioning cylinder 17 fixed to the body of the rope saw machine and a tensioning wheel 18 rotatably connected to the telescopic end of the tensioning cylinder. The tensioning wheel abuts against the side of the diamond rope away from the action surface to realize the rapid tensioning of the diamond rope.

[0046] The working principle of the present invention is that the rope storage device realizes the feeding of the diamond rope action surface by collecting the rope.

[0047] Example 2

[0048] like Figure 2 to Figure 6 As shown, a top cutting and pressure relief wire cutting method provided by the present invention is used to cut the top of a coal rock roof 1, and the top cutting is performed by combining a coal mine top cutting drill 2 with a rope saw 3 for quarrying. The top cutting method adopts a reverse cutting method according to the rope arrangement method of the cutting surface 8 of the coal rock roof relative to the rope saw, and includes the following steps:

[0049] S21. According to the designed top cutting width, two drill holes 5 with a diameter of 160 mm are constructed on the coal rock top plate by using the drill rig 6 on the top cutting drill vehicle arranged in the mining tunnel 4. The diameter of the drill hole is set to 160 mm to match the curvature radius of the diamond wire, and the distance between the two drill holes is 3500 mm to match the power of the wire saw machine.

[0050] S22, using a support and guide device provided on a coal mine top cutting drill vehicle to arrange a steel wire rope 19 with a tensioning device at the bottom to the deepest part of the borehole, wherein one end of the steel wire rope away from the tensioning device is connected to a lifting device 20, and the lifting device is fixed in the mining tunnel between the two boreholes;

[0051] S23, connecting the diamond rope 7 to the body of the wire saw machine, making the active surface of the diamond rope close to the cutting surface of the coal rock roof between the two drill holes through the stretching device 12, and tensioning the diamond rope through the tensioning mechanism of the wire saw machine;

[0052] S24, after the rope saw machine is started, the lifting device pulls up the diamond rope at a uniform speed through the wire rope traction and stretching device;

[0053] S25, releasing the rope through the rope storage device 9 added to the rope saw machine to keep the rope saw machine in normal working condition;

[0054] S26, after cutting is completed, collect the rope and prepare for the next operation cycle.

[0055] The support guide device includes a support rod 10 connected to the top of the coal mine cutting drill vehicle and a guide wheel 11 rotatably connected to the top and bottom of the support rod, and the diameter of the guide wheel is 130 mm. The guide wheel is used to provide guidance for the wire rope. The guide wheel at the top of the support rod is rotatably connected to the guide wheel bracket 11-1, and the guide wheel bracket is rotatably connected to the top of the support rod through a transverse bearing 11-2. The guide wheel can swing along the circumference of the support rod with the wire rope through the transverse bearing, which is conducive to adjusting the guide position of the wire rope. A guide wheel guard 11-3 is also provided at the top of the support rod. Through holes for the wire rope to pass through are provided on both sides of the guide wheel guard. By setting the guide wheel guard, it is beneficial to provide safety protection for the guide wheel and ensure the reliability of the device. The rope storage device includes a fixed frame 13, a movable frame 14 and a telescopic mechanism 15. The fixed frame is connected to the body of the rope saw machine. The two ends of the telescopic mechanism are respectively connected to the fixed frame and the movable frame. The fixed member and the movable frame are respectively provided with a plurality of steering wheels 16. The diamond rope is sequentially wound between the plurality of steering wheels on the fixed member and the movable frame. The fixed frame and the movable frame are moved closer to or farther from each other through the telescopic mechanism to achieve the release or collection of the diamond rope. The telescopic mechanism adopts a telescopic oil cylinder to make the storage operation of the diamond rope more convenient. The stretching device includes two sliding wheels. The two sliding wheels are respectively rotatably connected to the steel wire ropes in the corresponding side drilling holes. The ends of the two steel wire ropes away from the sliding wheels are connected to the lifting device. Through the traction of the lifting device, the steel wire rope can drive the sliding wheel to move upward, thereby achieving the feeding of the diamond rope action surface. The lifting device adopts a winch, and the winch is driven by hydraulic means to achieve synchronous release and collection of the two steel wire ropes. The tensioning mechanism includes a tensioning cylinder 17 fixed on the body of the wire saw machine and a tensioning wheel 18 rotatably connected to the telescopic end of the tensioning cylinder. The tensioning wheel abuts against the side of the diamond wire away from the action surface to achieve rapid tensioning of the diamond wire.

[0056] The working principle of the present invention is that the lifting device drives the steel wire rope to drag the stretching device upward to realize the feeding of the diamond rope action surface.

[0057] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the protection scope of the present invention.

Claims

1. A top cutting and pressure relief wire cutting method for top cutting of coal rock roof, characterized in that: top cutting is performed by combining a top cutting drill vehicle for coal mines with a rope saw machine for quarrying, and the top cutting method adopts a reverse cutting method according to the cutting surface of the coal rock roof relative to the rope arrangement method of the rope saw machine; The reverse cutting method comprises the following steps: S11. According to the designed cutting width, use the drill rig on the coal mine cutting drill vehicle arranged in the mining tunnel to construct two corresponding holes with a diameter of 160~200mm on the coal rock roof, and the distance between the two holes is 3500~4000mm; S12. Using the support and guide device provided on the top cutting drill vehicle for coal mines, the steel wire rope connected to the tensioning device at the bottom is arranged to the deepest part of the borehole, the end of the steel wire rope away from the tensioning device is connected to the lifting device, the lifting device is fixed in the mining tunnel between the two boreholes, the tensioning device includes two sliding wheels, the two sliding wheels are respectively rotatably connected to the steel wire ropes in the corresponding side boreholes, and the ends of the two steel wire ropes away from the sliding wheels are connected to the lifting device; S13. Connect the diamond wire to the main body of the wire saw machine, make the active surface of the diamond wire close to the cutting surface of the coal rock roof between the two drill holes through the stretching device, and tension the diamond wire through the tensioning mechanism of the wire saw machine; S14. After the wire saw machine is started, the lifting device pulls up the diamond wire at a constant speed through the wire rope traction and stretching device; S15. Release the rope through the rope storage device added to the rope saw machine to keep the rope saw machine in normal working condition; S16. After cutting is completed, the rope is collected and prepared for the next operation cycle.

2. A top cutting and pressure relief wire cutting method according to claim 1, characterized in that: The support and guide device includes a support rod connected to the top of the coal mine cutting drill vehicle and a guide wheel rotatably connected to the top and bottom of the support rod, and the guide wheel is used to provide a guide for the wire rope; the guide wheel at the top of the support rod is rotatably connected to the guide wheel bracket, and the guide wheel bracket is rotatably connected to the top of the support rod through a transverse bearing, and a guide wheel guard is also provided at the top of the support rod, and through holes are provided on both sides of the guide wheel guard for the diamond rope or the wire rope to pass through.

3. A top cutting and pressure relief wire cutting method according to claim 2, characterized in that: The support rod adopts a hydraulic support.

4. A top cutting and pressure relief wire cutting method according to claim 1, characterized in that: The rope storage device includes a fixed frame, a movable frame and a telescopic mechanism, the fixed frame is connected to the body of the rope saw machine, the two ends of the telescopic mechanism are respectively connected to the fixed frame and the movable frame, the fixed part and the movable frame are correspondingly provided with a plurality of groups of steering wheels, the diamond rope is sequentially wound between the plurality of groups of steering wheels on the fixed part and the movable frame, and the fixed frame and the movable frame are made to approach or move away from each other through the telescopic mechanism to realize the release or collection of the diamond rope.

5. A top cutting and pressure relief wire cutting method according to claim 4, characterized in that: The telescopic mechanism adopts a telescopic oil cylinder or an electric telescopic rod.

6. A top cutting and pressure relief wire cutting method according to claim 1, characterized in that: The lifting device adopts a winch, and the winch is driven by electric, hydraulic or pneumatic means. The winch is used to achieve synchronous retraction and release of two steel ropes.

7. A top cutting and pressure relief wire cutting method according to claim 1, characterized in that: The tensioning mechanism comprises a tensioning oil cylinder fixed on the body of the wire saw machine and a tensioning wheel rotatably connected to the telescopic end of the tensioning oil cylinder, and the tensioning wheel abuts against the side of the diamond wire away from the action surface.

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