Method and device for sawing coal in steep seam

Abstract

The application discloses a kind of acute inclined coal seam rope saw coal mining method and device, belong to the technical field of coal mining.Acute inclined coal seam rope saw coal mining method includes the following steps:S1: in acute inclined coal seam, arrange pseudo-inclined coal face;S2: in pseudo-inclined coal section interval, construction slide ditch;S3: in the slide ditch of adjacent two respectively, install auxiliary cutting device;S4: the position and angle of the guide wheel in the auxiliary cutting device are adjusted, so that the anti-cutting loop is formed between the stringing bead rope saw and the coal seam to be cut after passing through each guide wheel;S5: stringing bead rope saw cutting side is cut vertically from top to bottom to coal seam;S6: transversely adjust the auxiliary cutting device, and stringing bead rope saw cutting side is cut horizontally to coal seam;S7: vertically adjust the auxiliary cutting device, and stringing bead rope saw cutting side is cut vertically from bottom to top to coal seam, and broken coal is obtained.The technical scheme provided by the application can not be affected by coal seam inclination.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mining, and particularly relates to a method and apparatus for wire saw mining of steeply inclined coal seams. Background Technology

[0002] Steeply inclined coal seams generally refer to coal seams with a dip angle greater than 45°, mainly distributed in western my country, accounting for 15% to 20% of the proven reserves. Compared with gently inclined and inclined coal seams, steeply inclined coal seams have problems such as large dip angles, complex occurrence conditions, and numerous faults, folds, and undulations, making coal seam mining difficult. Common mining methods for steeply inclined coal seams include bench mining, horizontal segmented top coal caving mining, and roadway top coal caving mining. However, these methods generally suffer from high labor intensity, long preparation time, low recovery rate, large investment, and low safety.

[0003] Therefore, there is an urgent need for new methods for mining steeply inclined coal seams that can solve the technical challenges of safe and efficient mining, as well as reducing labor intensity and costs.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the technical problems of high efficiency, high cost, and low safety in existing technologies for mining steeply inclined coal seams, a wire saw mining method and apparatus for steeply inclined coal seams are provided.

[0006] This invention provides a method for wire saw mining of steeply inclined coal seams, comprising the following steps:

[0007] S1: Arrange pseudo-inclined mining faces on steeply inclined coal seams;

[0008] S2: Construction slipway trenches at intervals in coal mining sections;

[0009] S3: Install auxiliary cutting devices in each of the two adjacent slide grooves;

[0010] S4: Adjust the position and angle of each guide wheel in the auxiliary cutting device so that the beaded wire saw forms a reverse cutting loop with the coal seam to be cut after passing through each guide wheel;

[0011] S5: The beaded wire saw cuts the coal seam vertically from top to bottom on the cutting side;

[0012] S6: Adjust the auxiliary cutting device laterally, and the beaded wire saw cuts the coal seam laterally on the cutting side;

[0013] S7: Vertically adjust the auxiliary cutting device, and the beaded wire saw vertically cuts the coal seam from bottom to top to obtain crushed coal.

[0014] In some embodiments, the pseudo-inclined coal mining face mentioned in step S1 refers to a working face with an inclination angle of 25° to 45° set on a steeply inclined coal seam. The left and right sides of the working face are the top and bottom plates of the coal seam, and the lower part is the coal seam. The upper part of the pseudo-inclined coal mining face is a goaf supported by a flexible shield support.

[0015] In some implementations, in step S3, the auxiliary cutting devices in the two slide grooves are arranged opposite each other.

[0016] In some embodiments, adjusting the position and angle of each guide wheel in the auxiliary cutting device in step S4 includes: moving the two vertical slide rails of the auxiliary cutting device to the left and right sides, comprehensively adjusting each guide wheel, accurately calibrating its spatial coordinates and axial tilt angle, ensuring that the wire saw runs smoothly and centered in all wheel grooves, and making dynamic fine adjustments based on the wire saw tension during trial cutting. This is to prevent the wire saw from detaching during the cutting of the target coal body.

[0017] In some embodiments, in step S4, after the beaded wire saw passes through each guide wheel, a reverse cutting loop is formed between it and the coal seam to be cut. This includes: moving the beaded wire saw from the drive wheel of the wire saw machine, the universal wheel in the return airway, the universal wheel in the cut hole of the pseudo-inclined coal mining face, the left vertical guide wheel and the left horizontal guide wheel of the first auxiliary cutting device, one side of the coal and rock mass, the left vertical guide wheel, the left horizontal guide wheel, the right horizontal guide wheel, the right vertical guide wheel of the second auxiliary cutting device, the other side of the coal and rock mass, the right horizontal guide wheel and the right vertical guide wheel of the first auxiliary cutting device, the universal wheel in the cut hole of the pseudo-inclined coal mining face, the universal wheel in the return airway, and back to the drive wheel of the wire saw machine. The beaded wire saw is then connected end to end using the beaded wire saw connector to form a reverse cutting loop for the beaded wire saw to cut the coal seam.

[0018] In some embodiments, the lateral adjustment of the auxiliary cutting device in step S6 includes moving one of the vertical slide rails of the auxiliary cutting device in the direction to be cut.

[0019] In some embodiments, the vertical adjustment of the auxiliary cutting device in step S7 includes: precisely calibrating the spatial coordinates and axial tilt angle of each guide wheel of the auxiliary cutting device to ensure that the beaded wire saw runs smoothly and centered in all wheel grooves, and making dynamic fine adjustments based on the tension of the wire saw during trial cutting.

[0020] The second aspect of the present invention provides a coal mining auxiliary cutting device, applied to the above-mentioned steeply inclined coal seam wire saw coal mining method, including an upper support rod and a lower support rod, wherein the bottom of the upper support rod is fixed to an upper horizontal slide rail and the top of the lower support rod is fixed to a lower horizontal slide rail;

[0021] A first vertical slide rail and a second vertical slide rail are provided between the upper horizontal slide rail and the lower horizontal slide rail, and guide devices are slidably installed on the first vertical slide rail and the second vertical slide rail respectively.

[0022] In some embodiments, the upper horizontal slide rail is arranged parallel to the lower horizontal slide rail, and the first vertical slide rail is arranged parallel to the second vertical slide rail;

[0023] And / or, the two ends of the first vertical slide rail and the second vertical slide rail are slidably mounted on the upper horizontal slide rail and the lower horizontal slide rail respectively through fixed seats;

[0024] In some embodiments, the guiding device includes a vertical guide wheel and a horizontal guide wheel.

[0025] The third aspect of the present invention provides an application of the above-mentioned wire saw mining method for steeply inclined coal seams or the above-mentioned coal mining auxiliary cutting device in steeply inclined coal seams.

[0026] Compared with existing technologies, the technical effects achieved by this invention are as follows:

[0027] (1) The technical solution provided by the present invention can be flexibly arranged on the pseudo-inclined coal mining face through the guide wheel system, without being affected by the coal seam dip angle. The process of the wire saw cutting the coal seam is a continuous and linear static cutting, which can cut to form a flat and smooth cutting surface with narrow and regular gaps.

[0028] (2) The technical solution provided by the present invention has no risk of explosion during the wire saw cutting of coal seams, and has the characteristics of low dust, low noise, low vibration and high safety. The cutting depth and coal mining volume are adjustable, and the coal mining efficiency is high. It solves the problem of low efficiency of traditional methods. The mined coal seam enters the coal chute under the action of gravity and then enters the transportation system, with a high recovery rate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a steeply inclined coal seam wire saw cutting coal face provided in one embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the roadway layout of a steeply inclined coal mining face provided in one embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the auxiliary cutting device structure provided in one embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of a diamond wire saw cutting a coal seam in one embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the first segment of a diamond wire saw cutting a steeply inclined coal seam, provided in one embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the second section of the diamond wire saw cutting a steeply inclined coal seam, provided in one embodiment of the present invention.

[0035] In the diagram: 1-Return air gate; 2-Return airway; 3-Pseudo-inclined coal mining face cutter; 4-Slide ditch; 5-Machine roadway; 6-Ventilation opening; 7-Pedestrian eye; 8-Coal chute; 9-Transport roadway; 10-Transport gate; 11-Coal seam; 12-Floor plate; 13-Lower support rod; 14-Lower horizontal slide rail; 15-Locking parts and universal wheel assembly; 16-Diamond wire saw cutting side; 17-Vertical slide rail; 18-Cooling water nozzle; 19-Flexible shield support; 20-Goaf; 21-Roof; 22-Upper support rod; 23-Upper horizontal slide rail; 24-Diamond wire saw rope feeding side; 25-Fixed seat; 26-Wire saw machine; 27-Universal wheel assembly in return airway; 28-Vertical guide wheel one; 29-Horizontal guide wheel one; 30-Vertical guide wheel two; 31-Horizontal guide wheel two; 32-Vertical guide wheel three; 33-Water 34-Horizontal guide wheel; 35-Vertical guide wheel; 36-First vertical slide rail; 37-Second vertical slide rail; 38-Third vertical slide rail; 39-Fourth vertical slide rail; 40-Upper slide groove; 41-Lower slide groove; 42-Diamond wire saw cutting slot; 43-First section of coal seam mining face; 44-Second section of coal seam mining face; 45-Universal wheel set in the cutting center of the pseudo-inclined coal mining face. Detailed Implementation

[0036] The technical solution of the present invention will be described below with reference to the accompanying drawings and specific embodiments. It should be understood that the existence of other methods and steps before and after the combined steps, or the insertion of other methods and steps between these explicitly mentioned steps, does not preclude the use of one or more steps mentioned in the present invention. It should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise stated, the numbering of each method step is for the purpose of identifying each method step, and is not intended to limit the order of each method or limit the scope of the invention. Changes or adjustments to their relative relationships, without substantial changes to the technical content, can also be considered within the scope of the invention.

[0037] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0038] Example:

[0039] This invention provides a method and apparatus for wire saw mining of steeply inclined coal seams. This mining method is used for mining steeply inclined coal seams and solves the technical problems of high efficiency, high cost and low safety in the prior art of mining steeply inclined coal seams.

[0040] like Figures 1-6 As shown, in one embodiment, the wire saw mining method for steeply inclined coal seams includes the following steps:

[0041] S1: Arrange pseudo-inclined mining faces on steeply inclined coal seams;

[0042] S2: Construction slipway trenches at intervals in coal mining sections;

[0043] S3: Install auxiliary cutting devices in each of the two adjacent slide grooves;

[0044] S4: Adjust the position and angle of each guide wheel in the auxiliary cutting device so that the beaded wire saw forms a reverse cutting loop with the coal seam to be cut after passing through each guide wheel;

[0045] S5: The beaded wire saw cuts the coal seam vertically from top to bottom on the cutting side;

[0046] S6: Adjust the auxiliary cutting device laterally, and the beaded wire saw cuts the coal seam laterally on the cutting side;

[0047] S7: Vertically adjust the auxiliary cutting device, and the beaded wire saw vertically cuts the coal seam from bottom to top to obtain crushed coal.

[0048] The pseudo-inclined mining face mentioned in step S1 refers to a pseudo-inclined mining face with an inclination angle of 25°~45° arranged on a steeply inclined coal seam. The left and right sides of the working face are the coal seam roof 21 and floor 12, and the lower part is the coal seam 11. The upper part of the pseudo-inclined mining face is a goaf supported by a flexible shield support. Specifically, arranging a pseudo-inclined mining face on a steeply inclined coal seam includes: arranging a return airway 2 at the top of the inclined coal seam 11 and a transport airway 9 at the bottom; arranging a pseudo-inclined mining face cut-out 3 connecting the transport airway 9 and the return airway 2 on the inclined coal seam 11 between the return airway 2 and the transport airway 9; the inclination angle of the pseudo-inclined mining face is 25~30°. The upper end of the pseudo-inclined mining face cut-out 3 is connected to the return airway 2, and the lower end is connected to the machine roadway 5. The machine roadway 5 and the transport roadway 9 are connected by a coal chute 8, a pedestrian eye 7, and a ventilation eye 6. The return airway 2, the pseudo-inclined coal mining face cut-out 3, and the transport roadway 9 form a quadrilateral (similar to a rectangle) coal mining section. Flexible shield supports 19 are used to support the section from the return airway 2 through the pseudo-inclined coal mining face cut-out 3 to the transport roadway 9. After the support is completed, a wire saw 26 with a beaded wire saw is placed in the return airway 2.

[0049] In one embodiment, a transport gate 10 is provided in the transport tunnel 9, which is mainly used to transport out coal and gangue, and to transport in materials, equipment, and fresh air.

[0050] The selection of the flexible shield support is determined based on the coal seam thickness, which is determined by geological borehole exploration.

[0051] like Figure 3 As shown, an auxiliary cutting device includes an upper support rod 22 and a lower support rod 13. The material of the support rods is not limited, but metal is preferred. The bottom of the upper support rod 22 is fixed to an upper horizontal slide rail 23, and the top of the lower support rod 13 is fixed to a lower horizontal slide rail 14. Two parallel vertical slide rails 17 are provided between the upper horizontal slide rail 23 and the lower horizontal slide rail 14. The two ends of each vertical slide rail 17 are slidably mounted on the upper horizontal slide rail 23 and the lower horizontal slide rail 14 respectively through fixing seats 25. On the horizontal slide rail 14, the vertical slide rail 17 moves left and right on the horizontal slide rail by tightening and loosening the screws on the fixing seat 25. The upper horizontal slide rail 23 is arranged parallel to the lower horizontal slide rail 14. Guide devices are slidably installed on the two vertical slide rails 17 respectively. The guide device includes a locking member and a universal wheel assembly 15. The locking member and the universal wheel assembly 15 are an integral structure. The vertical movement on the vertical slide rail is achieved by tightening and loosening the locking member and the locking member on the universal wheel assembly 15. The universal wheel assembly includes vertical guide wheels and horizontal guide wheels.

[0052] In one embodiment, the following apparatus is also required during the mining of steeply inclined coal seams:

[0053] The pneumatic pick and the wire saw 26 with diamond bead wire saw, the diamond bead wire saw includes a steel wire rope, an isolation sleeve sleeved on the steel wire rope, beads fixed on the isolation sleeve and diamond abrasive grains embedded in the beads. The wire saw 26 is an explosion-proof crawler-type hydraulic wire saw. In the process of wire saw cutting steeply inclined coal seams, the main function of the wire saw 26 is to provide driving force for the diamond bead wire saw.

[0054] The steeply inclined coal seam mining device also includes a universal wheel assembly 27 in the return airway and a universal wheel assembly 45 in the cutting center of the pseudo-inclined coal mining face, which are mainly used to change the movement trajectory of the diamond wire saw.

[0055] In one embodiment, the auxiliary cutting device further includes a cooling water nozzle 18 for cooling the wire saw and reducing dust in the air during the cutting of the coal seam.

[0056] In one embodiment, in step S2 above, a pneumatic pick is used to construct a sliding trench 4 at regular intervals in the coal mining section within the cut-in 3 of the pseudo-inclined coal mining face. The interval is determined according to the on-site coal seam occurrence.

[0057] Step S3: Install an auxiliary cutting device in each of the two adjacent slide trenches 4. The upper support rod 22 of the auxiliary cutting device is installed within the support range of the flexible shield support 19 and is fixed to the coal seam roof 21 and bottom plate 12 by detachable expansion bolts. The lower support rod 13 is installed in the slide trench 4 and is fixed to the coal seam, coal seam roof 21 and bottom plate 12 by detachable expansion bolts.

[0058] Step S4, adjusting the position and angle of each guide wheel in the auxiliary cutting device so that the beaded wire saw forms a reverse cutting loop with the coal seam to be cut after passing through each guide wheel, including:

[0059] S41: First, move the first vertical slide rail 36 and the third vertical slide rail 38 to the leftmost position, and move the second vertical slide rail 37 and the fourth vertical slide rail 39 to the rightmost position and fix the fixing seat 25. Then, move the locking parts and universal wheel assembly 15 on the second vertical slide rail 37 and the fourth vertical slide rail 39 to the pre-cut position and fix them. Finally, according to the site conditions, adjust the spatial coordinates and axial tilt angles of the vertical guide wheels (28, 30, 32, 35) and horizontal guide wheels (29, 31, 33, 34) on the locking parts and universal wheel assembly 15 to ensure that the beaded wire saw runs smoothly and centered in the grooves of the vertical guide wheels 28 and 30, the vertical guide wheels 32 and 35, the horizontal guide wheels 29 and 31, and the horizontal guide wheels 33 and 34. During the trial cutting, make dynamic fine adjustments according to the rope tension.

[0060] S42: Threading the beaded wire saw, firstly, the beaded wire saw is moved from the drive wheel of the wire saw machine 26, through the universal wheel assembly 27 in the return airway, through the universal wheel assembly 45 in the pseudo-inclined coal mining face cutting center, through the vertical guide wheel 28, the horizontal guide wheel 29, through one side of the coal and rock mass, through the vertical guide wheel 32, the horizontal guide wheel 33, the horizontal guide wheel 44, the vertical guide wheel 45, through the other side of the coal and rock mass, through the horizontal guide wheel 31, the vertical guide wheel 30, through the universal wheel assembly 45 in the pseudo-inclined coal mining face cutting center, and through the universal wheel assembly 27 in the return airway back to the drive wheel of the wire saw machine 26; and the beaded wire saw is connected end to end using the beaded wire saw joint to form a closed loop for the beaded wire saw to cut the coal seam;

[0061] S43: Move the wire saw machine 26 towards the return air gate 1 to give the beaded wire saw a certain tension, and check that the beaded wire saw fits into the grooves of each guide wheel. After installation, perform debugging and run it unloaded for 3 minutes to confirm that the beaded wire saw does not jump out of the groove and that the universal wheel group rotates smoothly.

[0062] Step S5: Using the universal wheel assembly on the vertical slide rail, the cutting side 16 and the feeding side 24 of the diamond wire saw are offset. The wire saw is started, and the cutting side of the wire saw is used to cut the coal seam between adjacent slide grooves on one side, or the feeding side of the wire saw is used to cut the coal seam between adjacent slide grooves on one side. Alternatively, the cutting side and the feeding side of the wire saw can be selected to cut the coal seam between adjacent slide grooves simultaneously. The single-sided cutting refers to one side of the wire saw being fixed in a certain position and not participating in cutting the coal seam, while the other side of the wire saw is used to cut the coal seam between adjacent slide grooves. Specifically, the wire saw is started, and the cutting side 16 of the diamond wire saw is used to vertically cut the coal seam between the upper slide groove 40 and the lower slide groove 41, cutting out the diamond wire saw cutting groove 42. The vertical cutting refers to the diamond wire saw cutting side 16 cutting the coal seam from top to bottom until the cutting side of the wire saw reaches the pre-cutting position, and then the cutting stops.

[0063] Step S6: Move the wire saw 26 toward the cutting eye 3 of the pseudo-inclined coal mining face to give the wire saw a certain degree of relaxation. Loosen the fixing seat 25 on the first vertical slide rail 36 and the third vertical slide rail 38, and then move the first vertical slide rail 36 and the third vertical slide rail 38 to the right. After moving to the pre-cutting position, tighten the fixing seat 25, start the wire saw 26, and repeat step S43.

[0064] The coal seam between the upper slide groove 40 and the lower slide groove 41 is transversely cut using the diamond wire saw cutting side 16. The transverse cut is performed by the diamond wire saw cutting side 16 from left to right, and stops after cutting to the pre-cut position.

[0065] Step S7: Continue to start the wire saw machine 26 and move it towards the cutting eye 3 of the pseudo-inclined coal mining face, so that the diamond wire saw cutting side 16 has a certain degree of slack. Loosen the locking parts on the first vertical slide rail 36 and the third vertical slide rail 38 and the locking parts on the universal wheel assembly 15, and move the locking parts and universal wheel assembly 15 to the coal seam surface and fix them within the support range of the flexible shield support 19. Start the wire saw machine to vertically cut the coal seam between the upper slide groove 40 and the lower slide groove 41. The vertical cutting refers to the diamond wire saw cutting side 16. 6. Cut the coal seam from bottom to top until the diamond wire saw cutting side 16 reaches the pre-cutting position, then stop cutting, so that the coal seam between the upper sliding groove 40 and the lower sliding groove 41 is completely separated from the original coal seam. During the cutting process, a certain amount of coal pillars need to be reserved on both sides of the roof 21 and the bottom 12 for the flexible shield support 19 to be placed. After the coal seam is cut, the coal will slide into the coal chute 8 under the influence of gravity, and the coal will be transferred into the scraper conveyor in the transport roadway and then transferred to the belt conveyor to enter the mining area transport system.

[0066] Step S8: Repeat steps S4 to S7 until the coal seam cutting of the first section of the coal seam mining face 43 between the upper slide ditch 40 and the lower slide ditch 41 is completed. Then, disassemble the cutting auxiliary device in the lower slide ditch 41 and move it to the upper slide ditch in the cutting area of ​​the second section of the coal seam mining face 44 as the upper slide ditch 40 cutting auxiliary device for mining the lower section of the coal seam. The auxiliary device in the upper slide ditch 40 of the previous section is not disassembled and is used as the lower slide ditch 41 for mining the lower section of the coal seam. Repeat steps S3 to S6 to mine the inclined coal seam until the entire inclined coal seam is mined.

[0067] Step S9: Lower the flexible shield support 19, move the auxiliary cutting device, and repeat steps S2~S8 to start the mining of the next cycle of inclined coal seam.

[0068] In one embodiment, the cutting range of the coal seam can be adjusted by adjusting the longitudinal height and horizontal position of the guide wheel in steps S4 and S5, thereby enabling precise control of the coal seam cutting amount.

[0069] In one embodiment, the specific formula for calculating the single-cycle output P1 is as follows:

[0070]

[0071] P1 is the output per cycle. l For the length of the cutting working surface, h For cutting depth, γ The bulk density of coal, b The working face mining width, c The recovery rate of the working face is taken as 95%.

[0072] The formula for calculating the annual output of coal mining face is as follows:

[0073]

[0074] P This indicates the annual output of the working face. n This refers to the number of daily cycles for the working face. w The number of working days per year; generally 330 days is taken. η The cycle rate is set to 80%. P 1 represents the output per cycle.

[0075] In one embodiment, the steeply inclined coal seam has an average thickness of 1.85m and a true dip angle of 65°. A pseudo-inclined mining face with a dip angle of 25° is set on the coal seam to form... Figure 3The working face shown has a roof 21 and a floor 12 on the left and right sides, a coal seam 11 below, and a goaf 20 supported by a flexible shield support 19 above. When cutting the coal seam 11 from top to bottom, the cutting direction of the wire saw is consistent with the direction of gravity. The production capacity of the working face of the wire saw cutting the pseudo-inclined flexible shield support is as follows: During the test phase, the wire saw cuts the coal seam length... l The cutting depth is 35m. h The bulk density of coal is 0.80m. γ Take 1.42 g / cm 3 It takes about 2.5 hours to complete one coal mining cycle, and there are 9 cycles a day.

[0076] Single cycle output P The specific calculation formula is as follows:

[0077]

[0078] The annual output of wire saw coal mining face is:

[0079]

[0080] In conclusion, the wire saw mining method demonstrates unparalleled advantages in the face of steeply inclined coal seams, complex geological conditions, high safety requirements, and the need for precise mining. It solves the problem that traditional methods cannot be effectively used in steeply inclined coal seams, and represents an important trend in coal mining towards greater safety, environmental friendliness, precision, and higher recovery rates.

[0081] The technical solution provided by this invention can be flexibly arranged on the coal mining face through the guide wheel system, without being affected by the coal seam dip angle. The process of wire saw cutting steeply inclined coal seams is a continuous and linear static cutting, which can cut to form a flat and smooth cutting surface with narrow and regular gaps.

[0082] In addition, the technical solution provided by this invention has the characteristics of no explosion risk, low dust, low noise, low vibration and high safety during the wire saw cutting of coal seams. The thickness of the coal seam can be adjusted, the coal mining volume is accurate and the coal mining efficiency is high. It solves the problem that traditional methods cannot operate effectively. The mined coal seam flows into the coal chute under the action of gravity and is then transferred to the transportation system, with a high recovery rate.

[0083] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for wire saw mining of steeply inclined coal seams, characterized in that, Includes the following steps: S1: A pseudo-inclined mining face is arranged on a steeply inclined coal seam. The pseudo-inclined mining face refers to a working face with an inclination angle of 25° to 45° arranged on a steeply inclined coal seam. S2: Intermittently construct slide trenches in pseudo-inclined coal mining sections; S3: Install auxiliary cutting devices in two adjacent slide grooves respectively, with the auxiliary cutting devices in the two adjacent slide grooves arranged opposite to each other; S4: Adjust the position and angle of each guide wheel in the auxiliary cutting device so that the beaded wire saw forms a reverse cutting loop with the coal seam to be cut after passing through each guide wheel; S5: The beaded wire saw cuts the coal seam vertically from top to bottom on the cutting side; S6: Adjust the auxiliary cutting device laterally, and the beaded wire saw cuts the coal seam laterally on the cutting side; S7: Vertically adjust the auxiliary cutting device, and the beaded wire saw cuts the coal seam vertically from bottom to top to obtain crushed coal. The mined coal enters the coal chute under the action of gravity. In step S4, after the beaded wire saw passes through each guide wheel, a reverse cutting loop is formed between it and the coal seam to be cut. This includes: moving the beaded wire saw from the drive wheel of the wire saw machine, the universal wheel in the return airway, the universal wheel in the cut hole of the pseudo-inclined coal mining face, the left vertical guide wheel and the left horizontal guide wheel of the first auxiliary cutting device, one side of the coal and rock mass, the left vertical guide wheel, the left horizontal guide wheel, the right horizontal guide wheel, the right vertical guide wheel of the second auxiliary cutting device, the other side of the coal and rock mass, the right horizontal guide wheel and the right vertical guide wheel of the first auxiliary cutting device, the universal wheel in the cut hole of the pseudo-inclined coal mining face, the universal wheel in the return airway, and back to the drive wheel of the wire saw machine. The beaded wire saw is then connected end to end using the beaded wire saw joint to form a reverse cutting loop for the beaded wire saw to cut the coal seam. The auxiliary cutting device includes an upper support rod and a lower support rod. The bottom of the upper support rod is fixed to an upper horizontal slide rail, and the top of the lower support rod is fixed to a lower horizontal slide rail. A first vertical slide rail and a second vertical slide rail are provided between the upper horizontal slide rail and the lower horizontal slide rail, and guide devices are slidably installed on the first vertical slide rail and the second vertical slide rail respectively; The upper horizontal slide rail is arranged parallel to the lower horizontal slide rail, and the first vertical slide rail is arranged parallel to the second vertical slide rail; And / or, the two ends of the first vertical slide rail and the second vertical slide rail are slidably mounted on the upper horizontal slide rail and the lower horizontal slide rail respectively through fixed seats; And / or, the guiding device includes a vertical guide wheel and a horizontal guide wheel.

2. The wire saw mining method for steeply inclined coal seams according to claim 1, characterized in that, In step S1, the left and right sides of the working face are the top and bottom plates of the coal seam, and the lower part is the coal seam. The upper part of the pseudo-inclined coal mining working face is a goaf supported by a flexible shield support.

3. The wire saw mining method for steeply inclined coal seams according to claim 1, characterized in that, Step S4 involves adjusting the position and angle of each guide wheel in the auxiliary cutting device, which includes: moving the two vertical slide rails of the auxiliary cutting device to the left and right sides, comprehensively adjusting each guide wheel, accurately calibrating its spatial coordinates and axial tilt angle, ensuring that the beaded wire saw runs smoothly and centered in all wheel grooves, and making dynamic fine adjustments based on the wire saw tension during trial cutting.

4. The wire saw mining method for steeply inclined coal seams according to claim 1, characterized in that, The lateral adjustment of the auxiliary cutting device in step S6 includes moving one of the vertical slide rails of the auxiliary cutting device in the direction to be cut.

5. The wire saw mining method for steeply inclined coal seams according to claim 1, characterized in that, Step S7 involves vertically adjusting the auxiliary cutting device by moving each guide wheel of the auxiliary cutting device upwards, and then adjusting each guide wheel to be on the same plane.

6. The application of the wire saw mining method for steeply inclined coal seams according to any one of claims 1-5 in the mining of steeply inclined coal seams.

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