Large mining height single drum short wall coal mining machine and its coal mining technology

Abstract

The present invention relates to a large-mining-height single-drum short-wall coal mining machine and its coal mining process. The body of the coal mining machine is a rectangular box structure. Most of the double-traction walking mechanism is arranged in the box of the body. The cutting device is arranged above the body. The cutting device includes a cutting drum, a first-level large rocker arm, a second-level small rocker arm and a push cylinder. The first-level large rocker arm and the second-level small rocker arm can swing at a fixed point. The combination and adjustment of the two can obtain different heights of the cutting device to meet the requirements of large mining height. The coal mining process is to make the coal mining machine move back and forth between the head and tail of the conveyor for many times while cutting coal. Before each movement, the cutting drum is adjusted to different heights. After each adjustment, the area occupied by the cutting drum in the height direction can cover the full height of the coal seam of the coal wall, so that the full height can be mined after multiple round trips. The present invention can meet the comprehensive mining needs of mining the full height of the coal seam of the special thick short-wall working face of 5m and above at one time.

Description

Technical Field

[0001] The invention relates to a coal mining machine suitable for short-wall fully mechanized mining working faces of extra-thick coal seams and a multi-knife coal mining process implemented by using the coal mining machine, belonging to the technical field of coal mining equipment and process. Background Art

[0002] Single-drum short-wall coal mining machine is a kind of coal mining equipment commonly used in short-wall working faces. The existing single-drum short-wall coal mining machine is limited by the overall structure, and the mining height is usually about 3m, and the maximum mining height is usually no more than 4m. The small mining height leads to a long shutdown time for the entire mining area to move and turn the surface, and a long preparation period, which seriously affects the high-yield and efficient mining of the mine. For the special thick short-wall working face coal seam with a full mining height of more than 5m, there is still a gap in efficient and reliable coal mining machine equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a large mining height single drum short wall coal mining machine and its coal mining process to meet the needs of comprehensive mining of coal seams with extra thick short wall working faces of 5m and above with full height at one time.

[0004] The main technical solutions of the present invention are:

[0005] A large mining height single-drum short-wall coal mining machine, comprising a machine body, a cutting device and a double-traction walking mechanism, the machine body is a rectangular box structure, most of the double-traction walking mechanism is arranged in the box of the machine body, the cutting device is arranged above the machine body, the cutting device comprises a cutting drum, a first-level large rocker arm, a second-level small rocker arm and a pushing cylinder, one end of the shell of the first-level large rocker arm and one end of the pushing cylinder are respectively hinged to the machine body, the middle part of the shell of the first-level large rocker arm and the other end of the pushing cylinder are hinged, a motor and a rotating sleeve are arranged in the shell of the first-level large rocker arm, the rotating sleeve is rotatably connected to the inner hole of the shell of the first-level large rocker arm, and its axis is arranged horizontally front and back, the motor directly or indirectly drives the rotating sleeve to rotate relative to the shell of the first-level large rocker arm, one end of the rotating sleeve near the coal wall is fixedly connected to the shell of the second-level small rocker arm, and the cutting drum is installed on the coal wall side of the shell of the second-level small rocker arm.

[0006] The main components of the height adjustment hydraulic system and the electrical control system of the large-mining-height single-drum short-wall coal mining machine are distributed in the box of the machine body and above the machine body.

[0007] The height adjustment hydraulic system includes a pump motor assembly, a main oil tank and an auxiliary oil tank. The pump motor assembly and the main oil tank are arranged inside the box body of the fuselage, and the auxiliary oil tank is arranged above the fuselage in an articulated ear seat articulated with a first-stage large rocker arm.

[0008] The main oil tank and the auxiliary oil tank are connected by two rubber hoses of different thicknesses. The thicker rubber hose is an oil pipe arranged on the side of the fuselage near the coal wall, and the thinner rubber hose is a ventilation pipe arranged above the fuselage near the goaf.

[0009] The electrical control system includes an onboard electric control box and an onboard frequency converter box. The onboard electric control box is arranged in the middle of the double traction walking mechanism, and the onboard frequency converter box is arranged above the fuselage and away from one end of the articulated ear seat where the fuselage and the first-stage large rocker arm are articulated. The onboard electric control box and the onboard frequency converter box are connected by a connecting cable.

[0010] The double traction walking mechanism is preferably arranged symmetrically with the axis of the rotary sleeve as the center.

[0011] The large mining height single-drum short-wall coal mining machine also preferably includes an auxiliary coal blocking mechanism, which is installed on the top surface of the machine body and located between the machine body and the first-level large rocker arm. The auxiliary coal blocking mechanism is a telescopic structure, and its top follows the rise and fall of the first-level large rocker arm.

[0012] A coal mining process of a large mining height single-drum short-wall coal mining machine adopts any of the above-mentioned large mining height single-drum short-wall coal mining machines, firstly adjusts the cutting drum of the coal mining machine to the highest position, feeds the knife from the head or tail of the conveyor, moves toward the tail or head and cuts the top knife, and after cutting through, lowers the cutting drum to a height of a cutting drum diameter, feeds the knife from the tail or head, moves toward the head or tail and cuts the middle knife, and after cutting through, lowers the cutting drum to the bottom plate, feeds the knife from the head or tail, moves toward the tail or head and cuts the bottom knife until cutting through.

[0013] The beneficial effects of the present invention are:

[0014] The large mining height single-drum short-wall coal shearer of the present invention adopts an overall arrangement of a double-layer body and a two-stage rocker arm, breaking through the limitations of the original single-drum short-wall coal shearer structure and can greatly improve the mining height of the single-drum short-wall coal shearer, thus laying the foundation for achieving high-yield and efficient mining of short-wall working faces in extra-thick coal seams.

[0015] The large mining height single drum short wall coal mining machine of the present invention is not only particularly suitable for the short wall working face of comprehensive mining in extra thick coal seams, but can also be used for the auxiliary opening nests at the head and tail of the extra long working face in extra thick coal seams.

[0016] The large mining height single-drum short-wall coal mining machine of the present invention has a short body, compact structure, large mining height and strong adaptability. It can meet the needs of comprehensive mining of extra-thick short-wall working faces of 5m and above, and effectively solve the problem of efficient comprehensive mining of short-wall working faces in extra-thick coal seams.

[0017] Due to structural limitations and stability considerations, the large-mining-height single-drum short-wall coal mining machine of the present invention is generally not suitable for installing a large-diameter drum. When this type of coal mining machine is applied, the multi-knife coal mining process of the present invention is adopted to achieve the mining of extra-thick coal seams with a single small-diameter drum. When the coal seam is thin, two-knife mining can be completed. It can be seen that the multi-knife coal mining process of the present invention can make the advantages of the large-mining-height single-drum short-wall coal mining machine more fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the large mining height single drum short wall coal mining machine of the present invention;

[0019] Figure 2 is a schematic structural diagram of the cutting device;

[0020] Figure 3 for Figure 2 A top view of

[0021] Figure 4 It is a schematic diagram of the assembly relationship of the motor, rotary reducer assembly and other related parts;

[0022] Figure 5 It is a schematic diagram of the assembly relationship of the swivel sleeve and other related parts;

[0023] Figure 6 It is a schematic diagram of the large mining height single drum short wall coal mining machine of the present invention in the top cutting knife state;

[0024] Figure 7 It is a schematic diagram of the large mining height single drum short wall coal mining machine of the present invention in the cutting state;

[0025] Figure 8 It is a schematic diagram of the large mining height single drum short wall coal mining machine of the present invention in the bottom cutting knife state. Description of the drawings:

[0027] 1. Body; 2. Cutting device; 21. First-stage large rocker arm; 211. Motor; 212. Rotating sleeve; 213. Bearing; 214. Rotating reducer assembly; 215. Brake; 216. Final gear; 217. Rotating gear; 218. Transmission shaft; 22. Second-stage small rocker arm; 23. Pushing cylinder; 24. Cutting drum; 3. Double traction walking mechanism; 4. Auxiliary coal blocking mechanism; 5. Electrical control system; 6. Height adjustment hydraulic system. DETAILED DESCRIPTION

[0028] The present invention discloses a large mining height single drum short wall coal mining machine, such as Figure 1As shown, it includes a fuselage 1, a cutting device 2 and a double traction walking mechanism 3. The fuselage is a short and wide rectangular box structure. Most of the double traction walking mechanism is arranged in the box of the fuselage, and the cutting device is arranged above the fuselage. The cutting device adopts a combined structure of two-stage rocker arms, such as Figure 2 , 3 As shown, it includes a cutting drum 24, a primary large rocker arm 21, a secondary small rocker arm 22 and a push cylinder 23. One end of the shell of the primary large rocker arm and one end of the push cylinder are respectively hinged to the fuselage, and the middle of the shell of the primary large rocker arm and the other end of the push cylinder are hinged. The push cylinder can be extended and retracted to drive the primary large rocker arm to swing within a small angle range in the vertical plane, and the design value of the swing angle is not less than 30°. Figure 4 , 5 As shown, a motor 211 and a rotating sleeve 212 are provided in the housing of the first large rocker arm. The rotating sleeve is rotatably connected (for example, supported by a bearing 213) in the inner hole of the housing of the first large rocker arm, and its axis is arranged horizontally front and back. The motor directly or indirectly drives the rotating sleeve to rotate relative to the housing of the first large rocker arm. One end (i.e., the front end) of the rotating sleeve near the coal wall is cantilevered outside the housing of the first large rocker arm, and is fixedly connected to the housing of the second small rocker arm by screws and pins, so that the housing of the second small rocker arm can rotate clockwise and counterclockwise following the rotating sleeve. The cutting drum 24 is installed on the coal wall side of the housing of the second small rocker arm.

[0029] The design value of the bidirectional rotation range of the secondary small rocker arm should be no less than 360°, so that the cutting drum can reach very high and very low positions, which can not only increase the coal mining height, but also take into account the cutting penetration problem of the lower triangle coal at the head and tail of the coal mining machine.

[0030] When the piston rod of the push cylinder is fully extended, the first large rocker arm rises to the maximum height. In this case, when the second small rocker arm swings upward to form 90° with the horizontal plane, the cutting drum rises to the maximum height. When the piston rod of the push cylinder is fully retracted, the first large rocker arm drops to the minimum height. In this case, when the second small rocker arm swings downward to form 90° with the horizontal plane, the cutting drum drops to the minimum height.

[0031] The combined adjustment of the swing position of the first-stage large rocker arm and the second-stage small rocker arm is equivalent to adjusting the height of the cutting device, which can not only meet the requirements of a larger mining height, but also take into account the requirements of laying down the lower triangular coal at the head and tail of the machine. The maximum mining height of the large-mining-height single-drum short-wall coal mining machine of the present invention can reach 5200mm, and the maximum laying amount is 550mm.

[0032] The first-stage large rocker arm is preferably located directly above the fuselage.

[0033] In this embodiment, the motor 211 drives the final gear 216 to rotate through the rotary reducer assembly 214 in turn. Since the final gear 216 is externally meshed with the rotary gear 217 fixed on the rotary sleeve, the rotary sleeve also rotates synchronously. High-pressure oil is introduced into the motor, and the brake 215 between the motor and the reducer assembly is released. The rotary reducer assembly starts to rotate and drives the rotary sleeve to rotate through the final gear and the rotary gear. Since the rotary sleeve is fixed as a whole with the secondary small rocker arm, the secondary small rocker arm also swings synchronously with the rotary sleeve. After rotating in place, the brake is closed and the rotary sleeve is braked to stop.

[0034] A cutting motor and a large rocker arm transmission mechanism are also provided in the shell of the first-stage large rocker arm. A transmission shaft 218 is rotatably connected in the rotating sleeve. The output shaft of the cutting motor is coaxially connected to the input end of the large rocker arm transmission mechanism. The output end of the large rocker arm transmission mechanism is coaxially connected to the end of the transmission shaft 218 near the mined space.

[0035] A small rocker transmission mechanism and a planetary mechanism are arranged in the shell of the secondary small rocker arm. One end of the transmission shaft 218 near the coal wall is coaxially connected to the input end of the small rocker transmission mechanism, and the output end of the small rocker transmission mechanism is coaxially connected to the planetary mechanism. The cutting drum 24 is coaxially sleeved and installed on the planetary mechanism and is located on the coal wall side of the shell of the secondary small rocker arm. The power output by the cutting motor is sequentially transmitted to the cutting drum through the large rocker transmission mechanism, the transmission shaft, the small rocker transmission mechanism and the planetary mechanism, and finally the cutting drum implements the coal cutting operation.

[0036] In this embodiment, the slewing sleeve and the transmission shaft are arranged in the middle position of the shell of the first-stage large rocker arm, the cutting motor is arranged on their right side, and the motor and the slewing reducer assembly are arranged on their left side. The right end of the shell of the first-stage large rocker arm is hinged to the fuselage. The large rocker arm transmission mechanism adopts a gear transmission mechanism, which is integrally installed on the goaf side of the cutting motor and the slewing sleeve. The input end and the output end of the large rocker arm transmission mechanism can be coaxially connected to the output shaft of the cutting motor and the end of the transmission shaft near the goaf through a spline structure. The end of the transmission shaft near the coal wall can also be connected to the input end of the small rocker arm transmission mechanism through a spline structure.

[0037] The articulated seat where the shell of the first-stage large rocker arm is articulated with the fuselage can be designed as an integral structure with the fuselage according to the needs of going down the well, and can also be designed as a split structure connected with the fuselage through a cone pin.

[0038] The double traction travel mechanism includes a traction motor, a gear transmission mechanism and an independent travel box. The traction motor and the gear transmission mechanism are arranged inside the box of the machine body, and the independent travel box is fixedly arranged outside the box of the machine body near the goaf. The independent travel box contains an adjustable distance pad to adapt to scrapers of different widths.

[0039] The main components of the height adjustment hydraulic system 6 and the electrical control system 5 of the large mining height single-drum short-wall coal mining machine are distributed in the box of the machine body and above the machine body, which improves the space utilization rate of the machine body, makes the coal mining machine body shorter and the structure more compact.

[0040] The specific arrangement of the electrical control system in this embodiment is as follows: the electrical control system mainly includes an onboard electrical control box and an onboard frequency converter box. The onboard electrical control box is arranged in the middle of the double traction travel mechanism. Due to the length limitation of the fuselage, the onboard frequency converter box is arranged on the upper left of the fuselage. The onboard electrical control box and the onboard frequency converter box are connected by connecting cables. The frequency converter box can also be designed as a non-airborne type, arranged in the chute, and connected to the electrical control box by a traction cable.

[0041] The specific arrangement of the height adjustment hydraulic system is as follows: the main components of the height adjustment hydraulic system include a pump motor assembly, a main oil tank, an auxiliary oil tank and a height adjustment valve group, etc. The pump motor assembly and the main oil tank are arranged side by side inside the fuselage box to minimize the left-right length of the fuselage. The auxiliary oil tank is arranged in the hinged ear seat hinged to the cutting device at the upper right of the fuselage. The height adjustment valve group is arranged in the fuselage box below the auxiliary oil tank.

[0042] The main oil tank and the auxiliary oil tank are connected by two rubber hoses of different thicknesses. The thicker rubber hose is an oil pipe, which is arranged on the side of the machine body near the coal wall, and the thinner rubber hose is a vent pipe, which is arranged above the machine body near the goaf. The vent pipe and the auxiliary oil tank are connected by a quick plug, which is convenient for disassembly and assembly. The pump motor assembly sucks oil from the main oil tank, and the height adjustment valve group returns oil to the auxiliary oil tank. In order to improve the heat dissipation effect, the auxiliary oil tank is also preferably provided with a cooler.

[0043] The double-traction walking mechanism is preferably arranged symmetrically with the axis of the rotary sleeve, i.e., the rotation axis of the secondary small rocker arm, as the center to ensure that the amount of undercover at the head and the tail is the same.

[0044] The high-mining-height single-drum short-wall coal shearer preferably further comprises an auxiliary coal-blocking mechanism 4, which is mounted on the top surface of the machine body by screws and is located between the machine body and the first-stage large rocker arm. The auxiliary coal-blocking mechanism is a telescopic structure, and its top follows the first-stage large rocker arm to rise and fall. The auxiliary coal-blocking mechanism can prevent floating coal from accumulating on the machine body after the top knife cuts coal.

[0045] The auxiliary coal blocking mechanism is composed of grouped and layered small box structure units. The auxiliary coal blocking mechanism is divided into multiple groups in the left and right directions. Each group has one or more small box structure units stacked up and down. Two adjacent small box structure units in each group are hinged. All bottom small box structure units are hinged to the fuselage, and the axes of all hinges extend left and right. Each small box structure unit is correspondingly provided with a piston cylinder. Each small box structure unit swings slightly around its own hinge axis under the extension and contraction of the corresponding piston cylinder, thereby producing a lifting effect. When the piston cylinder is in a fully extended state, the front large surface of the corresponding small box structure unit is in an inclined state with the bottom edge forward and the top edge backward, and at this time, the front large surface of the small box structure unit is at the maximum inclination angle (referring to the acute angle) relative to the top surface of the fuselage.

[0046] When all the small box structure units are in the maximum inclination state, the front large surfaces of the small box structure units in the same group are flush, and the front large surfaces of the small box structure units in different groups are flush or parallel.

[0047] The piston cylinder includes a cylinder body, a compression spring and a piston. The piston and the cylinder body are slidably matched. The compression spring is located between the cylinder bottom and the piston of the cylinder body. When the first-stage large rocker arm descends, the piston cylinder contracts under the gravity of the first-stage large rocker arm, the small box structure unit swings downward, and the auxiliary coal blocking mechanism follows the descent. When the first-stage large rocker arm is lifted, the gravity of the first-stage large rocker arm is reduced or disappears, the built-in compression spring rebounds and stretches, the small box structure unit swings upward, and the auxiliary coal blocking mechanism also follows the lifting. A wedge block can also be provided on the top surface of each group of the top small box structure unit. The closer the group is to the articulated ear seat where the fuselage and the first-stage large rocker arm are hinged, the fewer layers it contains, and the closer the end height of the wedge block is to the articulated ear seat where the fuselage and the first-stage large rocker arm are hinged, the lower it is, so as to adapt to the wedge-shaped space with one end high and the other end low between the first-stage large boom and the fuselage. When the small box structure unit swings down, it swings down layer by layer from top to bottom. Before the first-stage large rocker arm descends to the lowest point, the auxiliary coal blocking mechanism has a situation where the upper layer swings down while the lower layer still maintains the maximum inclination state; there is also a situation where the upper layer swings down at a large angle from the maximum inclination state while the lower layer swings down at a small angle from the maximum inclination state.

[0048] The present invention also discloses a coal mining process of a large-mining-height single-drum short-wall coal mining machine: firstly, the cutting drum of the coal mining machine is adjusted to the highest position, such as Figure 6 As shown, the cutter is fed from the head or tail of the conveyor without oblique cutting, and moves toward the tail or head and cuts the top knife; after cutting through, the cutting drum is lowered to a height of one cutting drum diameter, as shown in FIG. Figure 7 As shown, the knife is fed from the tail or head of the machine, moves toward the head or tail of the machine and cuts the middle knife; after cutting through, the cutting drum is lowered to the bottom plate, as shown in FIG. Figure 8As shown, the cutter is fed from the head or tail of the machine, and moves toward the tail or head of the machine and cuts the bottom knife until it cuts through. The coal mining machine used is the aforementioned large mining height single drum short wall coal mining machine. The coal mining machine completes a complete coal cutting process by three knives going back and forth.

[0049] The present invention also discloses another coal mining process of a single drum short wall coal mining machine with large mining height: first adjust the cutting drum of the coal mining machine to the highest position, feed the knife from the head or tail of the conveyor, move toward the tail or head and cut the top knife, and after cutting through, lower the cutting drum to the bottom plate, feed the knife from the tail or head, move toward the head or tail and cut the bottom knife until cutting through. The coal mining machine used is the aforementioned single drum short wall coal mining machine with large mining height, and the diameter of the cutting drum is not less than half of the coal mining height. The coal cutting process can be completed by two round trips.

[0050] Whether it is the starting point or the end point of a one-way stroke, when the coal mining machine is at the head or tail of the machine, the cutting drum should be fully extended into the return air chute or the transport chute to ensure that the cutting is thorough and no coal seam residue remains.

[0051] When cutting the top knife, the hydraulic support of the working face should extend the telescopic top beam and the side guard plate in time to support the roof and coal wall in time. When cutting the bottom knife, the hydraulic support of the working face should be pulled and pushed in time. When the coal mining machine reaches the end of the entire process, the last row of supports will be pulled and pushed to push the scraper head to a cutting depth to the coal wall, and the support pulling and pushing work is completed.

[0052] The above-mentioned coal mining process of the present invention is a multi-blade coal mining process, which is to make the coal mining machine move back and forth multiple times between the head and the tail of the conveyor to cut coal at the same time, and adjust the cutting drum to different heights before each movement, so that the full height can be mined after multiple round trips. That is, the superposition of the area occupied by the cutting drum in the height direction after each adjustment can cover the full height of the coal seam of the coal wall.

[0053] The left and right mentioned in this article are Figure 1 Left and right in perspective, front and back in this article are Figure 3 Up and down perspective.

Claims

1. A large mining height single drum short wall coal mining machine, characterized in that: The invention comprises a machine body, a cutting device and a double-traction walking mechanism, the machine body is a rectangular box structure, most of the double-traction walking mechanism is arranged in the box of the machine body, the cutting device is arranged above the machine body, the cutting device comprises a cutting drum, a first-level large rocker arm, a second-level small rocker arm and a pushing cylinder, one end of the shell of the first-level large rocker arm and one end of the pushing cylinder are respectively hinged to the machine body, the middle part of the shell of the first-level large rocker arm and the other end of the pushing cylinder are hinged, a motor and a rotating sleeve are arranged in the shell of the first-level large rocker arm, the rotating sleeve is rotatably connected to the inner hole of the shell of the first-level large rocker arm, and its axis is arranged horizontally front and back, the motor directly or indirectly drives the rotating sleeve to rotate relative to the shell of the first-level large rocker arm, one end of the rotating sleeve near the coal wall is fixedly connected to the shell of the second-level small rocker arm, and the cutting drum is installed on the coal wall side of the shell of the second-level small rocker arm.

2. The large mining height single drum short wall coal mining machine according to claim 1, characterized in that: The double traction travel mechanism includes a traction motor, a gear transmission mechanism and an independent travel box. The traction motor and the gear transmission mechanism are both arranged inside the box of the fuselage, and the independent travel box is arranged on the side of the box of the fuselage near the goaf.

3. The large mining height single drum short wall coal mining machine according to claim 1, characterized in that: The main components of the height adjustment hydraulic system and the electrical control system are dispersedly arranged in the box of the fuselage and above the fuselage.

4. The large mining height single drum short wall coal mining machine according to claim 3, characterized in that: The height adjustment hydraulic system includes a pump motor assembly, a main oil tank and an auxiliary oil tank. The pump motor assembly and the main oil tank are arranged inside the box body of the fuselage, and the auxiliary oil tank is arranged above the fuselage in an articulated ear seat articulated with a first-stage large rocker arm.

5. The large mining height single drum short wall coal mining machine according to claim 4, characterized in that: The main oil tank and the auxiliary oil tank are connected by two rubber hoses of different thicknesses. The thicker rubber hose is an oil pipe arranged on the side of the fuselage near the coal wall, and the thinner rubber hose is a ventilation pipe arranged above the fuselage near the goaf.

6. The large mining height single drum short wall coal mining machine according to claim 3, characterized in that: The electrical control system includes an onboard electric control box and an onboard frequency converter box. The onboard electric control box is arranged in the middle of the double traction walking mechanism, and the onboard frequency converter box is arranged above the fuselage and away from one end of the articulated ear seat where the fuselage and the first-stage large rocker arm are articulated. The onboard electric control box and the onboard frequency converter box are connected by a connecting cable.

7. The large mining height single drum short wall coal mining machine according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The double traction walking mechanism is arranged symmetrically with the axis of the rotary sleeve as the center.

8. The large mining height single drum short wall coal mining machine according to claim 1, 2, 3, 4, 5 or 6, characterized in that: It also includes an auxiliary coal blocking mechanism, which is installed on the top surface of the fuselage and located between the fuselage and the first-level large rocker arm. The auxiliary coal blocking mechanism is a telescopic structure, and its top follows the rise and fall of the first-level large rocker arm.

9. A coal mining process of a large mining height single drum short wall coal mining machine, characterized in that: A single-drum short-wall coal mining machine with a large mining height as described in any one of claims 1 to 8 is used, wherein the cutting drum of the coal mining machine is first adjusted to the highest position, the knife is fed from the head or tail of the conveyor, the machine moves toward the tail or head and cuts the top knife, and after cutting through, the cutting drum is lowered to a height of a cutting drum diameter, the knife is fed from the tail or head, the machine moves toward the head or tail and cuts the middle knife, and after cutting through, the cutting drum is lowered to the bottom plate, the knife is fed from the head or tail, the machine moves toward the tail or head and cuts the bottom knife until cutting through.

10. A coal mining process of a large mining height single drum short wall coal mining machine, characterized in that: A large mining height single-drum short-wall coal mining machine as described in any one of claims 1 to 8 is used, and the diameter of the cutting drum is not less than half of the coal mining height. First, the cutting drum of the coal mining machine is adjusted to the highest position, the cutting drum is fed from the head or tail of the conveyor, and the cutting drum moves toward the tail or head and cuts the top knife. After cutting through, the cutting drum is lowered to the bottom plate, the cutting drum is fed from the tail or head, and the cutting drum moves toward the head or tail and cuts the bottom knife until cutting through.

Images