Multi-cutting device cooperates with coal cutting without bevel cutting feed system

Abstract

The application discloses a multi-cutting device cooperative coal cutting non-inclined cutting feeding system, which comprises a machine nest cutting device and a scraper conveyor. The machine nest cutting device comprises a traction part, a rotating arm and a cutting drum. The cutting drum is arranged at the first end of the rotating arm. The second end of the rotating arm is pivotally connected with the traction part. The rotating arm is used to drive the cutting drum to move relative to the coal seam. The extending direction of the scraper conveyor is perpendicular to the working face advancing direction. One machine nest cutting device is arranged at each end of the scraper conveyor. The traction part of the machine nest cutting device moves along the scraper conveyor. The middle part of the scraper conveyor is provided with a drum coal cutter for cutting the coal seam. Hydraulic supports are arranged on the side of the scraper conveyor far from the working face for supporting the roof. The multi-cutting device cooperative coal cutting non-inclined cutting feeding system has the advantages of high cutting efficiency and small influence on the original process.

Description

Technical Field

[0001] This invention relates to the field of intelligent coal mining technology, and in particular to a multi-cutting device collaborative coal cutting system with no oblique cutting. Background Technology

[0002] Achieving intelligent, unmanned mining at coal faces is crucial for the construction of intelligent coal mines. Currently, coal faces mainly use a single rocker-arm drum shearer for cutting and unloading coal. Due to the mechanical structure and cutting process of the rocker-arm drum shearer, the shearer needs to make oblique cuts at both ends of the working face. This results in problems such as complex cutting processes, low cutting speed, low efficiency, and difficulty in intelligent control, making it difficult to achieve routine intelligent, unmanned mining at coal faces and hindering the development of intelligent coal mines. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention propose a multi-cutting device cooperative coal cutting system without oblique cutting, which has the advantages of high cutting efficiency and minimal impact on the original process.

[0004] According to an embodiment of the present invention, a multi-cutting device cooperative coal cutting system without oblique cutting is provided. The system includes a cutting device and a scraper conveyor. The cutting device includes a traction unit, a rotating arm, and a cutting drum. The cutting drum is arranged at a first end of the rotating arm, and a second end of the rotating arm is pivotally connected to the traction unit. The traction unit is used to drive the rotating arm and the cutting drum to move. The cutting drum is used to cut the coal seam. The rotating arm is used to drive the cutting drum to move relative to the coal seam. The extension direction of the scraper conveyor is perpendicular to the working face advancing direction. One cutting device is arranged at each end of the scraper conveyor. The traction unit of the cutting device moves along the scraper conveyor. A drum coal miner is arranged in the middle of the scraper conveyor to cut the coal seam. A hydraulic support is arranged on the side of the scraper conveyor away from the working face for roof support.

[0005] The multi-cutting device collaborative coal cutting system without oblique cutting according to embodiments of the present invention has the advantages of high cutting efficiency and minimal impact on the original process. This application has the following advantages: It uses machine-shaped cutting devices at both ends of the coal face to cut out the cutting space for the drum coal shearer, enabling the drum coal shearer to perform non-oblique cutting at both ends of the working face. Furthermore, the coal cutting at both ends and the coal cutting in the middle of the working face are carried out in parallel. The cutting process is simple, the cutting efficiency is high, it facilitates routine intelligent unmanned mining, and it does not require additional support or transmission equipment modifications to the cutting device, resulting in low costs and easy promotion and popularization.

[0006] In some embodiments, the diameter of the cutting drum is smaller than the mining height of the drum coal mining machine at the working face, and the diameter of the cutting drum is greater than 1 / 3 of the mining height of the drum coal mining machine at the working face.

[0007] In some embodiments, the diameter of the cutting drum is 1 / 2 to 1 / 3 of the working face mining height.

[0008] In some embodiments, the rotating arm is located on the side of the traction unit adjacent to the end of the scraper conveyor to reduce the space occupied in the roadway.

[0009] According to an embodiment of the present invention, a multi-cutting device collaborative coal cutting process without oblique cutting is provided, comprising the following steps:

[0010] S1. The two ends of the working face are the upper end position and the lower end position, respectively. The two machine hole cutting devices on the scraper conveyor are pulled to the upper end position and the lower end position, and the cutting rollers of the two machine hole cutting devices enter the roadways at both ends of the working face respectively.

[0011] S2. Push the scraper conveyor at the lower end of the working face, and the machine hole cutting device at the lower end directly cuts the blade;

[0012] S3. The cutting device at the lower end reciprocates to cut coal to form a cutting hole;

[0013] S4. Pull the drum coal mining machine into the machine pit at the lower end position;

[0014] S5. Move the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the upper end position to feed.

[0015] S6. Pull the hydraulic support to support the roof, and the upper end of the machine hole cutting device and the drum coal mining machine move towards each other to cut coal.

[0016] S7. Push the scraper conveyor at the upper end position and pull the hydraulic support, and the machine hole cutting device at the upper end position directly cuts;

[0017] S8. The upper end of the machine head cutting device reciprocates to cut coal to form a machine head;

[0018] S9. Pull the drum coal mining machine into the machine recess area at the upper end position;

[0019] S10. Move the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the lower end position to feed.

[0020] S11. Pulling and moving the hydraulic support to support the roof, the machine hole cutting device at the lower end position and the drum coal mining machine move towards each other to cut coal;

[0021] S12. Push the scraper conveyor at the lower end position and pull the hydraulic support, and the machine hole cutting device at the lower end position directly cuts;

[0022] S13. The cutting device at the lower end position reciprocates to cut coal to form a cutting hole;

[0023] S14. Pull the drum coal mining machine into the machine recess area at the lower end position;

[0024] S15. Push the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the lower end position to feed.

[0025] S16. Repeat S006-S015 to continuously complete the coal cutting at the coal mining face.

[0026] In some embodiments, step S3 further includes pulling the hydraulic support to support the roof and pulling the machine hole cutting device to the corresponding position so that its cutting roller enters the roadway next to the working face.

[0027] In some embodiments, step S8 further includes, after the machine-cutting device has completed cutting at the upper end position, pulling the cutting roller of the machine-cutting device into the roadway beside the working face.

[0028] In some embodiments, the length of the straight section of the scraper conveyor after the push in step S2 is L, the length of the drum coal mining machine is L1, and the length of the machine hole cutting device is L2, where L>(1.2×L1+L2) to ensure that the rocker-arm drum coal mining machine can directly feed the cutting machine. In steps S6 and S11, the length of the curved section of the scraper conveyor is L3, and the distance at which the machine hole cutting device cuts coal is L+L3.

[0029] In some embodiments, the diameter of the cutting drum is 1 / 2 to 1 / 3 of the working face mining height, and the cutting drum reciprocates to cut coal four times. The first three operations cut the coal seam, and the fourth operation is for coal loading.

[0030] In some embodiments, the cutting depth of the cutting drum of the machine hole cutting device is equal to the cutting depth of the drum coal mining machine. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a multi-cutting device collaborative coal cutting system without oblique cutting according to an embodiment of the present invention.

[0032] Figure 2This is a schematic diagram of the usage status of the multi-cutting device collaborative coal cutting system without oblique cutting according to an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the cutting device of the multi-cutting device cooperative coal cutting non-oblique cutting feed system according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the initial state of the working face in the multi-cutting device cooperative coal cutting process without oblique cutting according to an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the working face of the machine-shaped cutting device in the multi-cutting device cooperative coal cutting process without oblique cutting according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the working face of a push scraper conveyor with a multi-cutting device co-operating coal cutting process without oblique cutting according to an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the working surface of the machine-shaped cutting device forming a machine-shaped cavity and pulling the hydraulic support in the multi-cutting device cooperative coal cutting without oblique cutting process according to an embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram of the working face of a drum coal mining machine entering the machine hole, using a multi-cutting device cooperative coal cutting process without oblique cutting according to an embodiment of the present invention.

[0039] Figure 9 This is a schematic diagram of the working face of a push scraper conveyor with a multi-cutting device co-operating coal cutting process without oblique cutting according to an embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram of the working surface of the pull-and-shift hydraulic support in the coal cutting process without oblique cutting according to an embodiment of the present invention.

[0041] Figure 11 This is a schematic diagram of the working face of the machine-shaped cutting device and the drum coal mining machine moving towards each other in the multi-cutting device cooperative coal cutting without oblique cutting process according to an embodiment of the present invention.

[0042] Figure 12 This is a schematic diagram of the working face of the scraper conveyor at the upper end of the coal cutting process without oblique cutting according to an embodiment of the present invention.

[0043] Figure 13 This is a schematic diagram of the working face of the hydraulic support for pulling the upper end of the coal cutting process without oblique cutting, which is a multi-cutting device cooperating in coal cutting according to an embodiment of the present invention.

[0044] Figure 14This is a schematic diagram of the working face forming a machine hole at the upper end of the multi-cutting device collaborative coal cutting process without oblique cutting according to an embodiment of the present invention.

[0045] Figure 15 This is a schematic diagram of the working face of a drum coal mining machine entering the upper end of the machine hole, which is a multi-cutting device cooperating coal cutting process without oblique cutting according to an embodiment of the present invention.

[0046] Figure 16 This is a schematic diagram of the working face of the push scraper conveyor in a straight line in the coal cutting process without oblique cutting according to the embodiment of the present invention, where multiple cutting devices work together to cut coal.

[0047] Figure 17 This is a schematic diagram of the working face of the hydraulic support in a straight line during the multi-cutting device coordinated coal cutting process without oblique cutting according to an embodiment of the present invention.

[0048] Figure 18 This is a schematic diagram of the working face where the lower end of the multi-cutting device coordinates coal cutting without oblique cutting in an embodiment of the present invention completes the cutting.

[0049] Figure 19 This is a schematic diagram of the working face of the scraper conveyor at the lower end of the coal cutting process without oblique cutting according to an embodiment of the present invention.

[0050] Figure 20 This is a schematic diagram of the working surface of the hydraulic support for pulling the lower end of the coal cutting process without oblique cutting, which is a multi-cutting device cooperating in a coal cutting process according to an embodiment of the present invention.

[0051] Figure 21 This is a schematic diagram of the working face forming a machine hole at the lower end of a multi-cutting device co-cutting coal cutting process without oblique cutting according to an embodiment of the present invention.

[0052] Figure 22 This is a schematic diagram of the working face of a drum coal mining machine entering the lower end of the machine hole, using a multi-cutting device coordinated coal cutting process without oblique cutting according to an embodiment of the present invention.

[0053] Reference numerals: 1. Cutting device; 11. Traction unit; 12. Rotary arm; 13. Cutting drum; 2. Drum coal mining machine; 3. Scraper conveyor; 4. Hydraulic support; 5. Transport roadway; 6. Return air roadway; 7. Upper end; 8. Lower end. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] According to an embodiment of the present invention, a multi-cutting device cooperative coal cutting system without oblique cutting is provided. The multi-cutting device cooperative coal cutting system without oblique cutting includes a machine-shaped cutting device 1 and a scraper conveyor 3. The machine-shaped cutting device 1 includes a traction unit 11, a rotating arm 12 and a cutting drum 13. The cutting drum 13 is arranged at the first end of the rotating arm 12, and the second end of the rotating arm 12 is pivotally connected to the traction unit 11. The traction unit 11 is used to drive the rotating arm 12 and the cutting drum 13 to move. The cutting drum 13 is used to cut the coal seam. The rotating arm 12 is used to drive the cutting drum 13 to move relative to the coal seam. The extension direction of the scraper conveyor 3 is perpendicular to the working face advancing direction. A machine-shaped cutting device 1 is arranged at each end of the scraper conveyor 3. The traction unit 11 of the machine-shaped cutting device 1 moves along the scraper conveyor 3. A drum coal miner 2 is arranged in the middle of the scraper conveyor 3 to cut the coal seam. A hydraulic support 4 is arranged on the side of the scraper conveyor 3 away from the working face for roof support. The traction unit 11 is the power source for the cutting device 1. Through a pivotal connection with the rotating arm 12, the traction unit 11 can flexibly drive the rotating arm 12 and the cutting drum 13 to move along the direction of the scraper conveyor 3. The rotating arm 12 is rotatably connected to the traction unit 11. Rotation of the rotating arm 12 relative to the traction unit 11 adjusts the height of the cutting drum 13, changing the cutting height and achieving accurate cutting of the coal seam. The cutting drum 13 can adjust its angle during movement according to the undulations of the coal seam and the actual conditions of the working face, thus better adapting to the complex coal mining environment. The rotating arm 12 has a certain length and strength, ensuring sufficient extension space and stability for the cutting drum 13 during operation, while also withstanding significant cutting forces and vibrations. The cutting drum 13 is the key component that directly contacts and cuts the coal seam. The cutting drum 13 can be made of high-strength steel and has cutting teeth on its surface, which can quickly cut the coal seam during rotation. The cutting drum 13 is positioned at the first end of the rotating arm 12, allowing it to better utilize the support of the rotating arm 12 and the power of the traction unit 11 during operation, thus achieving efficient cutting operations. The machine-shaped cutting device 1, through the cooperation of the traction unit 11, the rotating arm 12, and the cutting drum 13, can cut the two ends of the working face from within the transport roadways 5 and return air roadways 6 on both sides. The extended range of the rotating arm 12 reduces the space occupied by the traction unit 11 in the roadways on both sides, making it more flexible. The machine-shaped cutting device 1 avoids the difficulties of the drum coal mining machine 2, located in the middle of the working face, by cutting at an angle, thus improving coal mining efficiency. The traction unit 11 of the machine-shaped cutting device 1 moves on the scraper conveyor 3 and is positioned in the same row as the drum coal mining machine 2, simplifying the equipment by eliminating the need for additional moving path equipment and support equipment for the machine-shaped cutting device 1, reducing the number of equipment, streamlining the moving process, and improving efficiency.

[0056] In some embodiments, the diameter of the cutting drum 13 is smaller than the mining height of the drum coal mining machine 2 at the working face, and the diameter of the cutting drum 13 is greater than 1 / 3 of the mining height of the drum coal mining machine 2 at the working face.

[0057] Specifically, the drum shearer 2 can be a rocker arm type drum shearer 2. The diameter of the cutting drum 13 should be smaller than the mining height of the drum shearer 2 at the working face. This allows the cutting drum 13 to operate flexibly within the working range of the drum shearer 2, avoiding interference with the normal operation of the drum shearer 2 due to an excessively large cutting drum 13. Furthermore, if the diameter of the cutting drum 13 is too large, it will be difficult to enter the transport roadways 5 and return air roadways 6 on both sides of the working face, and the inability to feed from both sides will affect the cutting efficiency and cutting effect. If the diameter of the cutting drum 13 is too small (less than 1 / 3 of the mining height), it may lead to low cutting efficiency, ineffective cutting of the coal seam, and may even damage the cutting teeth or drum due to the insufficient contact area between the cutting teeth and the coal seam. In addition, a small diameter of the cutting drum 13 will increase the number of reciprocating cutting operations at the upper or lower end of the working face, affecting the efficiency of the machine hole formation and significantly impacting the original operation of the drum shearer 2. The cutting drum 13 can cover a large coal seam cutting area when rotating, while maintaining sufficient cutting depth and strength.

[0058] In some embodiments, the diameter of the cutting drum 13 is 1 / 2 to 1 / 3 of the working face mining height.

[0059] Specifically, the cutting drum 13 is used to handle areas that are difficult for the drum coal mining machine 2 to reach, optimize the overall coal mining process, and improve coal mining efficiency and quality. The diameter of the cutting drum 13 is controlled within the target range to ensure that it can effectively cut the coal seam when rotating, avoid low cutting efficiency due to excessive size, and also avoid collision or interference with the drum coal mining machine 2 during the coal mining process, thus ensuring the safe operation of the equipment.

[0060] In some embodiments, the rotating arm 12 is located on one side of the traction unit 11 adjacent to the end of the scraper conveyor 3 to reduce the space occupied in the roadway.

[0061] Specifically, when the rotating arm 12 is positioned on one side of the traction unit 11 near the end of the scraper conveyor 3, the rotating arm 12 is closer to the transport roadways 5 and return air roadways 6 on both sides of the working face. This facilitates the cutting drum 13 entering the roadways while the traction unit 11 remains on the scraper conveyor 3. The rotating arm 12, positioned close to the roadways, has a rotation range that covers both the roadways and the working face. This allows the cutting drum 13 to move flexibly between the roadways and the working face, completing various cutting tasks without requiring the traction unit 11 to enter the roadways to increase the rotation range of the rotating arm 12. This avoids the traction unit 11 occupying roadway space, ensuring unobstructed passage. Furthermore, the rotating arm 12 allows the cutting drum 13 to quickly enter the roadways for cutting, reducing equipment movement time and operational complexity, and better adapting to complex coal mining environments and task requirements.

[0062] According to an embodiment of the present invention, a multi-cutting device collaborative coal cutting process without oblique cutting is provided, comprising the following steps:

[0063] S1. The two ends of the working face are the upper end 7 and the lower end 7, respectively. The two machine hole cutting devices 1 on the scraper conveyor 3 are pulled to the upper end 7 and the lower end 7, respectively, and the cutting rollers 13 of the two machine hole cutting devices 1 enter the roadways at both ends of the working face; such as Figure 4 and Figure 5 As shown, the cutting device 1 is pulled to both ends of the working face to prepare for subsequent coal cutting operations, ensuring that the cutting drum 13 can smoothly enter the roadway and provide conditions for subsequent cutting operations.

[0064] S2, the scraper conveyor 3 at the lower end of the working face is moved, and the cutting device 1 at the lower end directly feeds and cuts; such as Figure 6 As shown, the purpose of moving the scraper conveyor 3 to the lower end position is to shorten the distance between the scraper conveyor 3 and the working surface, so as to facilitate the cutting of the machine hole cutting device 1.

[0065] S3, the lower end of the cutting device 1 reciprocates to cut coal to form a cutting groove; such as Figure 7 As shown,

[0066] S4, the traction drum coal mining machine 2 enters the machine recess at the lower end position; such as Figure 8 As shown, at this time, the drum coal mining machine 2 moves directly into the machine hole and can directly cut coal from the lower end position.

[0067] S5. Move the scraper conveyor 3 so that the distance between the scraper conveyor 3 and the working surface is equal, and prepare the cutting device 1 at the upper end 7 to feed; Figure 9As shown, at this time, the scraper conveyor 3 extends in a direction perpendicular to the working face and maintains a straight state, which facilitates the subsequent operation of the machine hole cutting device 1 at the upper end 7 position in conjunction with the drum coal mining machine 2, without the need to adjust the scraper conveyor 3 at the upper end 7 position separately.

[0068] S6. The hydraulic support 4 is pulled to support the roof, and the cutting device 1 and the drum coal mining machine 2 at the upper end 7 move in opposite directions to cut the coal; such as Figure 10 and Figure 11 As shown, the hydraulic support 4 is parallel to the scraper conveyor 3 and arranged in a straight line, which helps to support the roof in a timely manner. The counter-movement of the machine hole cutting device 1 and the drum coal mining machine 2 can shorten the working path of the drum coal mining machine 2 and improve the coal cutting efficiency.

[0069] S7. Push the scraper conveyor 3 at the upper end 7 position and pull the hydraulic support 4, so that the machine hole cutting device 1 at the upper end 7 position can directly cut; such as Figure 12 and Figure 13 As shown,

[0070] S8, the upper end 7 position of the cutting device 1 reciprocates to cut coal to form a cutting cavity; such as Figure 14 As shown, the machine hole cutting device 1 uses the cutting drum 13 to reciprocate and cut coal, creating a machine hole for the direct entry of the drum mining machine 2. After the machine hole is formed, the machine hole cutting device 1 is pulled to the upper end 7 position, and the cutting drum 13 of the machine hole cutting device 1 is placed in the roadway. During the process of making the machine hole, the drum mining machine 2 is pulled to move towards the upper end 7 to cut coal, realizing parallel operation of making the machine hole at the end and cutting coal in the middle of the working face, thereby improving production efficiency.

[0071] S9, the traction drum coal mining machine 2 enters the machine recess area at the upper end 7; such as Figure 15 As shown,

[0072] S10. Move the scraper conveyor 3 so that the distance between the scraper conveyor 3 and the working surface is equal, and prepare the cutting device 1 at the lower end position to feed; Figure 16 As shown.

[0073] S11, the hydraulic support 4 provides support to the roof, and the cutting device 1 and the drum coal cutter 2 at the lower end move towards each other to cut the coal; such as Figure 17 and Figure 18 As shown.

[0074] S12, push the scraper conveyor 3 at the lower end position and pull the hydraulic support 4, so that the machine hole cutting device 1 at the lower end position can directly cut; such as Figure 19 and Figure 20 As shown.

[0075] S13, the lower end of the cutting device 1 reciprocates to cut coal to form a cutting groove; such as Figure 21 As shown.

[0076] S14, the traction drum coal mining machine 2 enters the machine recess area at the lower end position; such as Figure 22 As shown.

[0077] S15. Push the scraper conveyor 3 so that the distance between the scraper conveyor 3 and the working surface is equal, and prepare the cutting device 1 at the upper end 7 to feed.

[0078] S16. Repeat S006-S015 to continuously complete the coal cutting at the coal mining face.

[0079] In some embodiments, step S3 further includes pulling the hydraulic support 4 to support the roof plate and traction the machine hole cutting device 1 to the corresponding position so that its cutting roller 13 enters the roadway next to the working face.

[0080] Specifically, the machine hole cutting device 1 uses the cutting drum 13 to reciprocate cutting coal, creating a machine hole that allows the rocker arm drum coal mining machine 2 to directly enter the machine hole, and pulls the hydraulic support 4 to provide timely support for the roof. After creating the machine hole, the machine hole cutting device 1 is pulled to the lower end position, and the cutting drum 13 of the cutting device is placed in the roadway, which makes it convenient for the drum coal mining machine 2 to enter the machine hole at the lower end for direct cutting, and also facilitates the next cutting operation of the cutting device.

[0081] Pulling and moving the hydraulic support 4 is a crucial safety measure during coal mining. As the cutting device 1 operates, the coal seam is cut, potentially affecting the stability of the roof. Timely pulling and moving the hydraulic support 4 effectively supports the roof, preventing collapse and ensuring safe mining operations. This step requires close coordination with the cutting operation to ensure the roof remains stably supported during cutting. Moving the cutting drum 13 into the roadway expands the mining area, reduces its space occupation, avoids collisions and interference between the drum shearer 2 and the cutting drum 13 causing equipment damage, and provides sufficient space for the subsequent entry of the drum shearer 2. Special attention must be paid to the equipment's movement path and spatial constraints during roadway operations to avoid collisions with other equipment or structures within the roadway.

[0082] In some embodiments, step S8 further includes traction of the cutting roller 13 of the machine hole cutting device 1 into the roadway beside the working face after the machine hole cutting device 1 has completed cutting at the upper end 7 position.

[0083] Specifically, through repeated coal cutting, the shearing device 1 gradually expands the cutting range, ultimately forming a suitable shearing area for the drum shearer 2 to enter. The size and shape of the shearing area must meet design requirements to ensure that the drum shearer 2 can smoothly enter and carry out subsequent coal cutting operations. The shearing device 1 uses the cutting drum 13 to reciprocate coal cutting, creating a shearing area that allows the rocker-arm drum shearer 2 to directly enter the shearing area, and pulls the hydraulic support 4 to provide timely support for the roof. After creating the shearing area, the shearing device 1 is pulled to the lower end position, and the cutting drum 13 of the shearing device is placed in the roadway, which facilitates the drum shearer 2 to directly enter the shearing area at the lower end and also facilitates the next cutting operation of the shearing device. Moving the cutting drum 13 into the roadway is to expand the range of the shearing area, reduce the space occupied by the cutting drum 13 in the shearing area, avoid collision and interference between the drum shearer 2 and the cutting drum 13 causing equipment damage, and provide sufficient space for the subsequent entry of the drum shearer 2. Special attention must be paid to the movement path and space constraints of the equipment when operating in the tunnel to avoid collisions with other equipment or structures in the tunnel.

[0084] In some embodiments, in step S2, the length of the straight section of the scraper conveyor 3 after being pushed is L, the length of the drum coal mining machine 2 is L1, and the length of the machine hole cutting device 1 is L2, where L>(1.2×L1+L2) to ensure that the rocker-arm drum coal mining machine 2 can directly feed the cutting machine. In steps S6 and S11, the length of the curved section of the scraper conveyor 3 is L3, and the distance at which the machine hole cutting device 1 cuts coal is L+L3.

[0085] Specifically, in step S2, the scraper conveyor 3 is moved to provide space for the cutting operation of the shearing device 1. The length L of the straight section of the scraper conveyor 3 ensures that the rocker-arm drum shearer 2 can directly advance, meaning the drum shearer 2 has sufficient space for coal cutting without interference from the scraper conveyor 3. In steps S6 and S11, the cutting distance of the shearing device 1 takes into account the impact of the scraper conveyor 3's curvature on the cutting operation, ensuring that the shearing device 1 can cover the entire working face and complete the cutting task. By reasonably controlling the length of the scraper conveyor 3, the risk of collisions between equipment is reduced, lowering the possibility of equipment wear and damage.

[0086] In some embodiments, the diameter of the cutting drum 13 is 1 / 2 to 1 / 3 of the working face mining height. The cutting drum 13 cuts coal four times in reciprocating motion. The first three operations cut the coal seam, and the fourth operation is for coal loading.

[0087] Specifically, the cutting drum 13 cuts the coal four times in reciprocating motion. The fourth time is the coal loading operation, in which the crushed coal is transported to the scraper conveyor 3 through the collection structure on the cutting drum 13, such as the negative pressure pipeline, to complete the coal loading.

[0088] Understandably, a smaller diameter of the cutting drum 13 reduces the size and weight of the equipment, facilitating operation in narrow working faces and roadways, while also lowering energy consumption. An appropriate diameter ensures that the cutting drum 13 effectively cuts the coal seam during rotation, while avoiding excessive wear on the cutting teeth and instability caused by an excessively large diameter. By repeatedly cutting coal and gradually breaking up the coal seam, cutting efficiency can be improved, reducing the load on each cut and thus reducing the required diameter of the cutting drum 13. Staged operation further reduces the load on the cutting drum 13 per cut, extending the service life of the cutting teeth and the drum itself.

[0089] The diameter of the cutting drum 13 should be smaller than the mining height of the drum shearer 2 at the working face. This allows the cutting drum 13 to operate flexibly within the working range of the drum shearer 2, preventing it from interfering with the normal operation of the drum shearer 2 due to its excessive size. Furthermore, an excessively large diameter would make it difficult for the cutting drum 13 to enter the transport roadways 5 and return air roadways 6 on both sides of the working face, hindering cutting efficiency and effectiveness. If the diameter of the cutting drum 13 is too small (less than 1 / 3 of the mining height), it may lead to low cutting efficiency, ineffective coal seam cutting, and even damage to the cutting teeth or drum due to insufficient contact area between the cutting teeth and the coal seam. Moreover, an excessively small diameter would increase the number of reciprocating cuts at the upper or lower end of the cutting drum 13 on the working face, affecting the efficiency of the coal seam formation and significantly impacting the original operation of the drum shearer 2. When rotating, the cutting drum 13 can cover a large coal seam cutting area while maintaining sufficient cutting depth and intensity.

[0090] In some embodiments, the cutting depth of the cutting drum 13 of the machine hole cutting device 1 is equal to the cutting depth of the drum coal mining machine 2 each time.

[0091] Specifically, maintaining the same cutting depth between the cutting drum 13 and the drum shearer 2 ensures seamless connection between the shearing device 1 and the drum shearer 2 during coal mining, avoiding coal seam residue or over-cutting due to inconsistent cutting depths. Furthermore, it ensures that the shape and size of the shearing cavity meet the entry and operation requirements of the drum shearer 2. As mentioned in the preceding steps, the shearing device 1 and the drum shearer 2 move in opposite directions and operate in parallel; therefore, the consistent cutting depth ensures uniform crushing of the coal seam, improves the quality of coal crushing, reduces excessively large or small coal blocks, and increases coal loading efficiency. It also reduces mutual interference between equipment, improving overall coal mining efficiency. Finally, it reduces load variations during coal mining, lowers wear on the cutting teeth and drum, extends equipment lifespan, reduces maintenance costs, and facilitates coordination between the scraper conveyor 3 and the hydraulic support 4.

[0092] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0095] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0096] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A multi-cutting device collaborative coal cutting process without oblique cutting, characterized in that, The invention includes a coal cutting system using multiple cutting devices in coordination without oblique cutting. The system includes a cutting device, which comprises a traction unit, a rotating arm, and a cutting drum. The cutting drum is arranged at a first end of the rotating arm, and a second end of the rotating arm is pivotally connected to the traction unit. The traction unit is used to drive the rotating arm and the cutting drum to move. The cutting drum is used to cut the coal seam, and the rotating arm is used to drive the cutting drum to move relative to the coal seam. The scraper conveyor extends perpendicularly to the working face advancing direction. A machine hole cutting device is arranged at each end of the scraper conveyor. The traction part of the machine hole cutting device moves along the scraper conveyor. A drum coal mining machine is arranged in the middle of the scraper conveyor to cut the coal seam. A hydraulic support is arranged on the side of the scraper conveyor away from the working face to provide roof support. The process includes the following steps: S1. The two ends of the working face are the upper end position and the lower end position, respectively. The two machine hole cutting devices on the scraper conveyor are pulled to the upper end position and the lower end position, and the cutting rollers of the two machine hole cutting devices enter the roadways at both ends of the working face respectively. S2. Push the scraper conveyor at the lower end of the working face, and the machine hole cutting device at the lower end directly cuts the blade; S3. The cutting device at the lower end reciprocates to cut coal to form a cutting hole; S4. Pull the drum coal mining machine into the machine pit at the lower end position; S5. Move the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the upper end position to feed. S6. Pull the hydraulic support to support the roof, and the upper end of the machine hole cutting device and the drum coal mining machine move towards each other to cut coal. S7. Push the scraper conveyor at the upper end position and pull the hydraulic support, and the machine hole cutting device at the upper end position directly cuts; S8. The upper end of the machine head cutting device reciprocates to cut coal to form a machine head; S9. Pull the drum coal mining machine into the machine recess area at the upper end position; S10. Move the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the lower end position to feed. S11. Pulling and moving the hydraulic support to support the roof, the machine hole cutting device at the lower end position and the drum coal mining machine move towards each other to cut coal; S12. Push the scraper conveyor at the lower end position and pull the hydraulic support, and the machine hole cutting device at the lower end position directly cuts; S13. The cutting device at the lower end position reciprocates to cut coal to form a cutting hole; S14. Pull the drum coal mining machine into the machine recess area at the lower end position; S15. Push the scraper conveyor so that the distance between the scraper conveyor and the working surface is equal, and prepare the cutting device at the upper end position to feed. S16. Repeat S006-S015 to continuously complete the coal cutting at the coal mining face.

2. The multi-cutting device collaborative coal cutting process without oblique cutting according to claim 1, characterized in that, The diameter of the cutting drum is smaller than the mining height of the drum coal mining machine at the working face, and the diameter of the cutting drum is greater than 1 / 3 of the mining height of the drum coal mining machine at the working face.

3. The multi-cutting device collaborative coal cutting process without oblique cutting according to claim 2, characterized in that, The diameter of the cutting drum is 1 / 2 to 1 / 3 of the working face mining height.

4. The multi-cutting device collaborative coal cutting process without oblique cutting according to claim 1, characterized in that, The rotating arm is located on one side of the traction unit near the end of the scraper conveyor to reduce the space occupied in the roadway.

5. The multi-cutting device collaborative coal cutting process without oblique cutting according to claim 1, characterized in that, The S3 step also includes pulling the hydraulic support to support the roof plate and pulling the machine hole cutting device to the corresponding position so that its cutting roller enters the roadway next to the working face.

6. The multi-cutting device cooperative coal cutting process without oblique cutting according to claim 1, characterized in that, In step S8, after the machine hole cutting device completes cutting at the upper end position, the cutting roller of the machine hole cutting device is pulled into the roadway next to the working face.

7. The multi-cutting device cooperative coal cutting process without oblique cutting according to claim 1, characterized in that, In step S2, the length of the straight section of the scraper conveyor after the push is L, the length of the drum coal mining machine is L1, and the length of the machine hole cutting device is L2. L>(1.2×L1+L2) to ensure that the rocker arm drum coal mining machine can directly feed. In steps S6 and S11, the length of the curved section of the scraper conveyor is L3, and the distance of the machine hole cutting device cutting coal is L+L3.

8. The multi-cutting device cooperative coal cutting process without oblique cutting according to claim 1, characterized in that, The diameter of the cutting drum is 1 / 2 to 1 / 3 of the working face mining height. The cutting drum cuts coal four times in reciprocating motion. The first three operations cut the coal seam, and the fourth operation is for coal loading.

9. The multi-cutting device collaborative coal cutting process without oblique cutting according to claim 1, characterized in that, The cutting depth of the cutting drum of the machine hole cutting device is equal to the cutting depth of the drum coal mining machine.

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