A long-arm combined coal mining machine

Abstract

The present invention discloses a combined coal mining machine with an extended arm, which is a coal mining machine suitable for thin coal seam mining. It includes a main machine, an extended arm, and a cutting part. The main machine is provided with an extended propulsion part. The extended arm and the cutting part can be arranged on both sides of the main machine. Extended arm propulsion mechanisms are symmetrically provided at both ends of the extended propulsion part. The driving power, transmission box, and spiral conveying rod of the cutting part are all arranged in the cutting part box. The extended arm includes at least one extended arm unit. The extended arm unit includes an outer box body and two spiral conveying rods arranged in the outer box body. The extended arm units and the extended arm units and the cutting part are connected by connecting pins through the outer box body of the extended arm unit. Through the propulsion of the main machine propulsion mechanism, the electric motor of the cutting part drives the drill bit to cut coal, and the spiral conveying rod transports coal. By adding the extended arm without stopping, the predetermined mining depth is reached, which solves the problem of low intermittent production efficiency of previous coal drilling machines and realizes continuous, safe and efficient coal mining.

Description

Technical Field

[0001] The invention relates to a long-arm combined coal shearer, belonging to the technical field of coal shearing equipment. Background Art

[0002] Currently, the vast majority of mechanized coal mining methods are conducted on working faces approximately 100 meters in length. These systems consist of coal mining machinery, transport equipment, roof support, and goaf management, a process known as longwall mining. This type of mining primarily relies on drum shearers and plows, creating a complex mining system with a high number of equipment and workers. Furthermore, these systems are costly, difficult to manage, and unsafe. These issues are particularly acute for thin coal seams less than 1 meter thick due to limited operating space. Consequently, many mines often abandon these thin seams, resulting in a significant waste of resources.

[0003] In recent years, three-axis auger shearers and four-axis auger shearers (coal drills) have emerged, which use strip mining to mine thin coal seams. Although these shearers can achieve unmanned face mining in thin coal seams, they have not been widely used due to the following shortcomings:

[0004] (1) Low efficiency: Due to the limitations of the structure and working principle, the operation mode is intermittent production, that is, after drilling a section, the drill must stop and carry out the time-consuming and labor-intensive work of connecting the drill tool (it is necessary to disconnect the main engine power unit and the drill tool, then connect a section of the drill tool and reconnect it). The actual coal production time is short (taking a 1.5-meter-long drill rod as an example, it takes 2 minutes to drill a section of coal, and 10 minutes to connect it), resulting in low production efficiency;

[0005] (2) High failure rate: Since the connection of the drill bit must take into account both torque transmission and axial locking, the drill bit connection structure is complex and the operation is cumbersome. It is often difficult to lock and unlock, resulting in a long auxiliary time and the drill rod connection is easy to disengage and fall into the borehole;

[0006] (3) The inevitable roof collapse in the borehole of the mine is extremely difficult to handle when the drilling pressure occurs, and may even result in the drilling tool being discarded, resulting in high usage costs and poor adaptability. Summary of the Invention

[0007] In response to the above-mentioned defects in the prior art, the present invention provides a long-arm combined coal mining machine to solve the problem in the prior art that in thin coal seam mining, drum coal mining machines and coal plows cannot be used for mining, and although coal drilling machines can be used for mining, the overall efficiency is low, the failure rate is high, the use cost is high, and the adaptability is poor.

[0008] The present invention is realized through the following technical scheme: an extended arm type combined coal mining machine, comprising a main machine, an extended arm, and a cutting part, the cutting part comprising a transmission box, a drill bit and two parallel first spiral conveying rods, a walking mechanism is provided at the lower part of the main machine, and is characterized in that: an extended propulsion part is provided on the main machine, the extended propulsion part has an extended arm propulsion channel, the front and rear sides of the main machine can be arranged with extended arms and cutting parts corresponding to the extended arm propulsion channels, the extended arm propulsion mechanism is symmetrically provided at the left and right ends of the extended propulsion part, the extended arm propulsion mechanism comprises a circular guide rail, two sliding frames slidably arranged on the circular guide rail, and a push cylinder, the two ends of the circular guide rail are connected to the front and rear sides of the extended propulsion part, the push cylinder is a two-way piston rod output structure, the two sliding frames are respectively connected to the two ends of the piston rod of the push cylinder, and a one-way shift block is provided on the sliding frame; the cutting The driving power of the cutting part, the transmission box and the first screw conveying rod are all arranged in the cutting part box, and the two sides of the cutting part box are provided with a plurality of propulsion grooves that can cooperate with the one-way shift block on the sliding frame. The first screw conveying rod of the cutting part is driven by the transmission box of the cutting part; the extension arm includes at least one extension arm unit, and the extension arm unit includes an outer box body and two parallel second screw conveying rods rotatably arranged in the outer box body. Both sides of the outer box body of the extension arm unit are respectively provided with a plurality of propulsion grooves that can cooperate with the one-way shift block on the sliding frame, and the docking end of the first screw conveying rod and the two ends of the second screw conveying rod are provided with a plug-in docking structure, and the extension arm units and the extension arm unit and the cutting part box body of the cutting part are connected by a connecting pin through the outer box body of the extension arm unit.

[0009] The operating principle of the present invention is as follows: the main machine is driven by a travel mechanism located below. The main machine is positioned within a mining tunnel, with a cutting unit connected to an extension arm. The extension arm propulsion mechanism of the extension propulsion unit uses a hydraulic cylinder to propel the extension arm and cutting unit toward one side of the coal seam. The cutting unit's drill bit and first auger rotate under the driving force of the cutting unit, cutting coal through the rotation of the drill bit, and the mined coal is transported out via the first and second auger rods. The extension arm can be connected and extended to meet the mining depth. To connect the extension arms, the outer housings of the individual extension arm units are simply connected via pins, and the auger rods do not need to be axially fixed. Similarly, the extension arm can be disassembled by removing the connecting pins between the extension arm units. The present invention allows the cutting unit and extension arm to be advanced in both directions, enabling bidirectional mining. That is, after mining on one side is completed and the propulsion arm on that side is withdrawn, the extension arm propulsion mechanism of the extension propulsion unit can advance the cutting unit and extension arm on the other side to mine the coal on the other side, significantly improving production efficiency.

[0010] Furthermore, in order to increase the coal mining volume, the drill bit of the cutting part is a six-axis linkage structure.

[0011] Furthermore, the main machine is symmetrically equipped with four positioning and fixing components, located on the left and right ends of the extended propulsion unit. Each positioning and fixing component includes a fixed cylinder, an adjustment cylinder, a limit rod, and a guide sleeve bracket. The guide sleeve bracket is fixed to the end of the extended propulsion unit. One end of the fixed cylinder movably engages with a sleeve of the guide sleeve bracket and its other end is connected to the extended propulsion unit. The adjustment cylinder is hinged between the guide sleeve bracket and the main machine's traveling chassis. One end of the limit rod is hinged to the guide sleeve bracket and its other end movably and vertically engages with a sleeve fixed to the traveling chassis. By adjusting the cylinders, the coal mining machine's various operating postures, such as the hole position, propulsion pitch angle, and center height, can be adjusted to suit geological conditions such as the location of the coal seam in the corresponding roadway. Because the adjustment cylinders are not suitable for bearing lateral forces, limit rods are provided to limit the horizontal relative position of the extended propulsion unit and the traveling mechanism. The cylinder barrel of the fixed cylinder in the positioning and fixing component can extend along the sleeve of the guide sleeve bracket and press against the sides of the roadway, thereby fixing the entire machine's operating posture and balancing propulsion resistance.

[0012] Furthermore, to facilitate the advancement of the extension arm, the upper surface of the outer box of the extension arm unit is smooth. This smooth upper surface of the outer box can effectively prevent the problem of jamming caused by roof collapse and ensure the smooth retraction of the extension arm and cutting unit during retraction.

[0013] Furthermore, ventilation ducts are provided on both sides of the outer box of the extension arm unit, which are used for ventilation in the mining hole to control the gas content within a safe range.

[0014] Furthermore, the front and rear sides of the extension propulsion unit are respectively provided with limit cylinders corresponding to the extension arm propulsion channel. The limit cylinders can limit the extension arm unit that has been advanced (or retracted) to a position, making it easier to connect (or disconnect).

[0015] Furthermore, the main machine's running mechanism comprises two sets of crawler running mechanisms, the chassis frames of which are hingedly connected via connecting rods. The use of two sets of crawler running mechanisms provides large traction, strong adaptability, and good maneuverability and flexibility.

[0016] Furthermore, to facilitate the transport of mined coal, a conveyor unit is located beneath the main unit. This unit is a bottom-mounted belt conveyor mechanism, with the conveyor belt located within a reserved gap in the main unit's chassis. This bottom-mounted structure reduces the height of the unit's coal mining center.

[0017] Furthermore, in order to facilitate docking with subsequent conveying equipment, the output end of the transport unit is higher than the portion passed by the reserved gap of the walking chassis of the main machine.

[0018] The beneficial effects of the present invention are as follows: the present invention forms a power front arrangement structure of the cutting part by arranging a cutting part box body outside the cutting part and arranging the driving power of the cutting part, the spiral conveying rod, etc. of the cutting part inside the cutting part box body, so that the spiral conveying rod in the subsequent connecting arm is only passively driven to rotate, and a continuous production mode of non-stop connecting can be realized, which completely solves the problem of the existing spiral drill coal mining machine that needs to stop for drilling tool connecting, basically eliminates the auxiliary time, and only this one item can increase the production efficiency by 3 times; the connecting arm of the present invention adopts the connecting arm unit design, the structural design is simple, the connecting arm is simple to connect, and the connecting arm can be connected by connecting the non-rotating outer box body of the connecting arm unit. The spiral rod does not need to be axially fixed, and the operation is simple. The operation is simple, the connection is reliable, there is no disconnection phenomenon, and the box-type structural design of the connecting arm unit is convenient to advance and there is no jamming phenomenon when withdrawing. The present invention can realize the function of two-way advancement of the connecting arm for coal mining by arranging the cutting part and the connecting arm on both sides of the main machine. Under the condition of arranging a tunnel, both sides can mine coal, saving the cost of preparing the tunnel. Moreover, after mining one side, it is only necessary to install a set of cutting parts on the other side to realize the operation mode of retreating one side and advancing the other side. The simplified operation makes the equipment less manpower-intensive, the working environment of the workers is good, the intensity is low, and the production efficiency is high. By setting up a bottom-mounted conveying part, the mined coal can be directly transported to the main transportation system of the mine, simplifying the configuration of the mine transportation system and reducing the mining cost. The present invention realizes a production mode of easy operation, non-stop docking, continuous and efficient coal mining operation, and has strong adaptability and can realize unmanned working face mining. The coal mining machine of the present invention is used for mining thin coal seams, which solves the problems that existing equipment mining methods cannot mine coal, or can mine coal but with low efficiency, high cost, poor reliability and poor safety. It realizes efficient, safe and convenient mining of unmanned working faces in thin coal seams, and the mining cost is much lower than other mining methods, which can bring both economic and social benefits to the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front schematic diagram of the present invention;

[0020] Figure 2 yes Figure 1 Schematic top view of

[0021] Figure 3 is a top view of the extension arm unit of the present invention;

[0022] Figure 4 is a schematic top view of the cutting portion of the present invention;

[0023] Figure 5 is a schematic cross-sectional view of the cutting portion of the present invention;

[0024] In the figure, 1. main machine, 2. extension arm, 3. cutting part, 4. electric control hydraulic system, 5. electric roller, 6. bracket, 7. guide sleeve bracket, 8. fixed cylinder, 9. circular guide rail, 10. extension propulsion part, 11. one-way shift block, 12. sliding frame, 13. push cylinder, 14. guide roller, 15. transport part, 16. conveyor belt, 17. walking chassis, 18. pressure roller, 19. window frame, 20. limit cylinder, 21. connecting rod, 22. roller, 23. positioning and fixing part, 24. adjustment Cylinder, 25. Chassis bracket, 26. Track, 27. Hydraulic motor, 28. Connecting pin, 29. Outer box, 30. Second screw conveyor rod, 31. Rod support, 32. Drill bit, 33. Transmission box, 34. Reducer, 35. Monitoring and adjustment system, 36. Electric motor, 37. First screw conveyor rod, 38. Ventilation duct, 39. Propulsion groove for connecting long arm, 40. Propulsion channel for connecting long arm, 41. Limit rod, 42. Propulsion groove for cutting part, 43. U-shaped groove, 44. Cutting part box. DETAILED DESCRIPTION

[0025] The present invention will be further described below by way of non-limiting embodiments with reference to the accompanying drawings:

[0026] As shown in the accompanying drawings, a combined coal mining machine with an extended arm includes a main machine 1, an extended arm 2, a cutting part 3 and an electronically controlled hydraulic system 4.

[0027] The main machine 1 is a critical component of the unit; it performs the machine positioning during coal mining operations, the bidirectional propulsion of the cutting section 3 and the extension arm 2, and the transportation of mined coal. The main machine 1 includes a traveling chassis 17 and an extension propulsion section 10. The traveling chassis 17 is the traveling mechanism, which enables the main machine 1 to move. The traveling mechanism in the present invention can adopt various structural forms of traveling mechanisms known in the prior art, such as a crawler traveling mechanism. To improve the adaptability, maneuverability, and flexibility of the equipment, the traveling mechanism of the main machine 1 in the present invention preferably utilizes two sets of crawler traveling mechanisms, arranged front and back in the direction of movement. The crawler traveling mechanism is known in the art, and each set of crawler traveling mechanisms includes a chassis bracket 25, two crawler tracks 26, and a drive mechanism, which is driven by a hydraulic motor 27. The chassis brackets 25 of the two crawler traveling mechanisms are hingedly connected by a connecting rod 21. The hydraulic motor 27 has its own reducer, and the hydraulic motor 27 drives the crawler tracks 26 to achieve movement of the main machine 1. The extension propulsion unit 10 is arranged on the upper part of the walking chassis 17 of the main machine 1. The extension propulsion unit 10 is a frame structure, and its front and rear ends are two symmetrical window-shaped frames 19 welded from thick steel plates. The rectangular frame between the two window-shaped frames 19 is the extension arm propulsion channel 40, which is the channel for the extension arm 2 to be propelled. An extension arm propulsion mechanism is symmetrically arranged at the left and right ends of the extension propulsion unit 10. The extension arm propulsion mechanism includes a circular guide rail 9, two sliding frames 12 slidably arranged on the circular guide rail 9, and a push cylinder 13. The two ends of the circular guide rail 9 are connected to the window-shaped frames 19 on the front and rear sides of the extension propulsion unit 10. The push cylinder 13 is a bidirectional piston rod output structure that can meet the requirements of bidirectional docking and propulsion of the extension arm 2. The push cylinder 13 is installed in the U-shaped groove 43 of the window-shaped frame 19. The cylinder body of the push cylinder 13 is fixed to the extension propulsion unit by the boss in the middle of the cylinder body. The two sliding frames 12 are respectively hinged to the two ends of the piston rod of the push cylinder 13. A one-way shift block 11 is connected to the sliding frame 12. The one-way shift block 11 is used to push the extension arm. The push cylinder 13 can drive the sliding frame 12 to slide along the circular guide rail 9, and the one-way shift block 11 set on the sliding frame 12 pushes the extension arm 2 forward.

[0028] The main machine 1 is arranged symmetrically, and the extension arms 2 and the cutting parts 3 can be arranged on both the front and rear sides of the main machine 1 corresponding to the extension arm propulsion channels 40 .

[0029] The extension arm 2 includes at least one extension arm unit, which comprises an outer housing 29 and two parallel second screw conveyor rods 30 rotatably mounted within the outer housing 29. The outer housing 29 is a rectangular box constructed of welded steel plates. A honeycomb structure may be employed to increase rigidity and reduce weight. To facilitate the advancement and retraction of the extension arm and prevent jamming caused by roof collapse, the upper surface of the outer housing 29 of the extension arm unit is preferably smooth. A rectangular cable trough is located above the outer housing 29 for storing the motor cables, cooling water pipes, and monitoring and detection cables for the cutting unit 3. Multiple thrust grooves 39 are provided on either side of the outer housing 29, each of which engages with the one-way shifting blocks 11 on the sliding frame 12. The extension arm propulsion mechanism inserts the one-way shifting blocks 11 into the thrust grooves 39 to propel the extension arm 2. Two second screw conveyor rods 30 are arranged in the center of the housing via rod supports 31 and are used for transporting coal. Both ends of the second screw conveyor rod 30 are equipped with plug-in docking structures. This docking structure can adopt various plug-in docking structures known in the art, such as a plum blossom coupling structure, or other structures. When connecting the extension arm units, the connection between the extension arm units is achieved through connecting pins 28 arranged on both sides of the outer housing 29. The second screw conveyor rods 30 of the two units are connected by plug-in docking. The extension arm unit is also connected to the cutting section 3 via connecting pins 28 arranged on the outer housing 29. The outer housing 29 structure used by the extension arm unit greatly simplifies the docking operation of the extension arm and prevents obstruction caused by roof caving in the hole, ensuring smooth retraction. The number of extension arm units to be deployed is determined based on the required mining depth. To facilitate ventilation, ventilation ducts 38 are also provided on both sides of the outer housing 29 of the extension arm unit. The ventilation ducts 38 are used to ventilate the mining hole to control the gas content within a safe range. In the present invention, a limiting oil cylinder 20 is further arranged on the upper side of the window-shaped frame 19 to limit the extension arm 2 that has been advanced (or retracted) to a position, so as to facilitate docking (or disengagement).

[0030] The cutting section 3 is the critical coal-feeding component of the entire unit. It comprises a cutting section housing 44, a transmission case 33, multiple drill bits 32, two parallel first screw conveyor rods 37, a reducer 34, an electric motor 36, and a monitoring and adjustment system 35. The cutting section housing 44 is a rectangular structure, housing the transmission case 33, first screw conveyor rods 37, reducer 34, electric motor 36, and monitoring and adjustment system 35. The docking end of the first screw conveyor rod 37 is also equipped with a plug-in docking structure that mates with the second screw conveyor rod 30 of the extension arm unit. The plug-in docking structure at the docking end of the first screw conveyor rod 37 mates with the plug-in docking structure at the end of the second screw conveyor rod 30. Both sides of the cutting section housing 44 are provided with multiple thrust grooves 42 that engage with the one-way shifting blocks 11 on the sliding frame 12. The extension arm thrust mechanism inserts the one-way shifting blocks 11 into the thrust grooves 42 to propel the cutting section 3. The transmission case 33 is equipped with multiple drive shafts, each driven by meshing gears mounted on the shafts. The drill bit 32 is connected to its corresponding drive shaft at the front of the transmission case 33, while the two first auger rods 37 are connected to their corresponding drive shafts at the rear of the transmission case 33. In the present invention, the cutting unit 3 employs a front-mounted power arrangement. Power from the motor 36 is transmitted via the reducer 34 through the transmission case 33 to the drill bits 32 and the two first auger rods 37. The drill bits 32 rotate to cut coal, while the first auger rods 37 rotate to transport the coal to the second auger rod 30 of the extended arm 2, where it is then removed, achieving coal extraction. Due to the limited size of the drill hole, the motor 36 of the cutting unit 3 is preferably water-cooled, and the reducer 34 is a planetary gear type, resulting in a compact overall structure. To maximize coal extraction, the cutting unit 3 employs a six-axis linkage arrangement, with each of the six drill bits 32 connected to a drive shaft within the transmission case 33. The cutting unit 3 of the present invention can be driven by a single drive system. In this embodiment, two drive systems are employed, each driving three drill bits and a second auger 30. The six-axis, linked drill bit arrangement enables a single drill stroke to produce a rectangular hole approximately three meters wide, significantly increasing coal production. The monitoring and adjustment system 35 is used for in-hole gas detection, coal-rock identification, and drilling posture adjustment, ensuring safe production and the cleanliness of the extracted coal. This monitoring and adjustment system 35 is conventional technology.

[0031] The electronically controlled hydraulic system 4 comprises an electronic control system and a hydraulic system. The electronic control system is responsible for the shearer's power input and output, as well as the programmed sequence control of the automatic system. It consists of switches, a control box, and sensors, all of which meet underground explosion-proof requirements. The hydraulic system provides power and control for the travel mechanism, cylinders, motors, and other actuators. Both the electronic control system and the hydraulic system are state-of-the-art.

[0032] To facilitate securing and adjusting the machine's operating position during coal mining, as well as transporting the mined coal, the main machine 1 of the present invention is also equipped with a positioning and fixing unit 23 and a transport unit 15. The traveling chassis 17 is fixedly connected to the transport unit 15, while the positioning and fixing unit 23 is fixedly connected to the extension and propulsion unit 10. The chassis bracket 25 of the crawler mechanism is equipped with a connecting structure connecting the positioning and fixing unit 23 and the transport unit 15. The chassis bracket 25 has a reserved mounting position for the transport unit 15's conveyor belt 16.

[0033] The positioning and fixing components 23 consist of four sets symmetrically arranged at the left and right ends of the extension propulsion unit 10. Each set of positioning and fixing components 23 includes a fixed cylinder 8, an adjustment cylinder 24, a limit rod 41, and a guide sleeve bracket 7. The guide sleeve bracket 7 is fixed to the end of the extension propulsion unit 10. The guide sleeve bracket 7 has a sleeve. The cylinder of the fixed cylinder 8 movably engages with the sleeve of the guide sleeve bracket 7. The other end of the fixed cylinder 8 is connected to the extension propulsion unit 10. The adjustment cylinder 24 is hingedly connected between the guide sleeve bracket 7 and the traveling chassis 17 of the main machine 1. One end of the limit rod 41 is hinged to the guide sleeve bracket 7, and the other end is movable up and down to slide with the sleeve fixed to the traveling chassis 17. The limit rod is used to limit the horizontal relative position of the extension propulsion unit and the traveling mechanism, preventing lateral force on the adjustment cylinder. By raising and lowering the adjustment cylinder 24, the various operating postures of the coal mining machine, such as the drilling position, propulsion pitch angle, and center height, can be adjusted to suit the geological conditions such as the location of the corresponding roadway coal seam. By operating the fixed oil cylinder 8, the cylinder barrel can be extended along the sleeve of the guide sleeve bracket 7 and pressed against the two sides of the lane, thereby fixing the working posture of the unit and balancing the propulsion resistance.

[0034] The transport unit 15 is located below the main unit 1 and is used to transport the mined coal. It is a belt conveyor mechanism consisting of a motorized drum 5, pressure rollers 18, idlers 22, guide rollers 14, a conveyor belt 16, and a support 6. To reduce the height of the unit's coal mining center, the transport unit 15 in the present invention is bottom-mounted. The transport unit 15 is mounted on a traveling chassis 17 via the support 6, and the conveyor belt 16 of the transport unit 15 passes through a reserved gap in the traveling chassis 17. To facilitate connection with subsequent conveying equipment, the output end of the transport unit 15 is elevated above the portion passing through the reserved gap in the traveling chassis 17 of the main unit 1. Specifically, once the conveyor belt 16 reaches a free-space point outside the extension propulsion unit 10, the drum is raised to drop the coal, accommodating subsequent transport equipment. Coal mined by the cutting unit 3 is transported out of the borehole via the screw conveyor rod of the extension arm 2 and drops onto the conveyor belt 16 at the bottom opening of the extension propulsion unit 10 for transport.

[0035] The working principle of the present invention is:

[0036] The main machine 1 is placed in the mining tunnel and fixed after adjusting the propulsion state. The extension propulsion unit 10 pushes the extension arm 2 and the cutting unit 3 toward one side of the coal seam. The motor reducer of the cutting unit 3 drives the drill bit 32 to cut the coal, and the spiral conveyor rod transports the coal. By adding the extension arm 2, the coal mining operation reaches the predetermined depth. The specific working steps are described as follows:

[0037] (1) Machine relocation and positioning:

[0038] By operating the hydraulic motor 27 of the walking chassis 17 to drive the crawler 26, the main machine 1 is moved to the required coal mining position in the tunnel, and the adjustment cylinder 24 is operated to make the height and inclination of the frame consistent with the coal seam to be mined. Then, the fixing cylinder 8 is operated to extend and support the two sides of the tunnel. The main machine 1 is oriented and fixed, and the next step is to carry out coal mining operations.

[0039] (2) Coal mining operations:

[0040] During coal mining, a set of cutting parts 3 is placed at the window-shaped frame 19 position of the main machine 1, and the electric control system is operated to start the motor 36 of the cutting part 3. The transmission box 33 is driven by the reducer 34, and then the drill bit 32 and the first spiral conveying rod 37 are driven to rotate. Under the propulsion action of the push cylinder 13 of the extended propulsion part 10, the drill bit 32 is pushed into the coal seam. The first spiral conveying rod 37 rotates to transport the coal. The coal passes through the hole at the bottom of the extended propulsion part 10 and falls onto the conveyor belt 16 of the transport part 15 for transportation.

[0041] After the cutting part 3 is drilled into place, without stopping the cutting part 3, a set of extension arm units can be placed in the docking position of the window-shaped frame 19, and the push cylinder 13 is started to push the extension arm unit to dock with the cutting part 3, and the connecting pin is inserted to connect. Continue to push the extension arm 2 to perform coal mining operations. Repeat the above procedures to push the extension arm 2 section by section until the predetermined coal mining depth (generally about 60 meters) is reached. Since the function of docking the extension arm 2 without stopping is realized, that is, the front cutting part 3 can realize continuous coal mining, and the spiral conveying rod of the rear extension arm 2 only rotates to transport coal outward, continuous production can be achieved, which greatly improves production efficiency. In addition, the docking of the extension arm 2 is only connected to the outer box body 29 without rotational movement, which requires less manpower, is simple to operate, and has reliable connection.

[0042] After one side of the coal is mined, another set of cutting units 3 is connected to the other side. The motor 36 is started in the reverse direction, and the push cylinder 13 is operated to withdraw the cutting unit 3 and extension arm 2 on the mined side. At the same time, the cutting unit 3 and extension arm 2 on the other side are pushed into the other side to mine coal. They are pushed to the predetermined depth. At this point, the extension arm 2 on the mined side has also been withdrawn. The implementation of this function perfectly combines the withdrawal operation on one side with the advancement operation on the other side, greatly simplifying the operation process and improving production efficiency.

[0043] After mining is complete on both sides, the retraction procedure is executed, and the extension arm 2 is sequentially withdrawn from the borehole. Because the extension arm unit utilizes a box-shaped structure, connection is simple and reliable. Disengagement requires only pulling out the connecting pin, making operation simple. The upper surface of the outer box 29 is smooth along the axis, effectively preventing obstructions caused by roof falls and ensuring smooth retraction of the extension arm 2 and cutting unit 3, thereby improving the equipment's adaptability to complex geological conditions (particularly roof conditions).

[0044] Afterwards, the hydraulic system is operated to retract the fixed cylinder 8, start the crawler belt 26, and drive the main machine 1 along the roadway to the next mining location to start coal mining in the second rectangular hole. Because the present invention is designed with two sets of crawler belts in a linked traveling mechanism, the traction force is large and the adaptability is strong, which greatly shortens the moving time and can also achieve the purpose of rapid moving over long distances without disassembling the machine, greatly improving the maneuverability and flexibility.

[0045] In summary, the present invention can realize unmanned mining of thin coal seams, a continuous production mode with non-stop docking, simple docking of the connecting arm 2, no jamming during withdrawal, and safe and efficient completion of various processes such as coal breaking, loading, and transporting within the working face, without the need for various supporting and transporting equipment. Since equipment maintenance at the working face is also carried out in the tunnel outside the working face, the present invention frees workers from more dangerous work locations, frees them from heavy physical labor and a harsh working environment, greatly improves safety, and requires fewer people, high labor productivity, and enables the development of coal seams that are difficult or impossible to mine using conventional methods, thereby improving resource utilization. The implementation of the present invention's continuous production mode makes its production efficiency far higher than that of spiral drill coal mining machines and conventional coal mining equipment. The application of the present invention to thin coal seam mining solves the problems of previous equipment mining methods that cannot be mined, or can be mined but with low efficiency, high cost, poor reliability, and poor safety, and can bring both economic and social benefits to the mine.

[0046] Although the present invention has been disclosed above in terms of a preferred embodiment, it is not intended to limit the present invention. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention. However, these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

[0047] The other parts of this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A combined coal mining machine with an extended arm, comprising a main machine (1), an extended arm (2), and a cutting unit (3), wherein the cutting unit (3) comprises a transmission box (33), a drill bit, and two parallel first spiral conveying rods (37), and a traveling mechanism is provided at the lower part of the main machine (1), and is characterized by: The main machine (1) is provided with an extension propulsion unit (10), the extension propulsion unit (10) having an extension arm propulsion channel (40), the front and rear sides of the main machine (1) corresponding to the extension arm propulsion channel (40) can be provided with extension arms (2) and cutting units (3), and the left and right ends of the extension propulsion unit (10) are symmetrically provided with extension arm propulsion mechanisms, the extension arm propulsion mechanisms comprising a circular guide rail (9), two sliding frames (12) slidably provided on the circular guide rail (9), , a push oil cylinder (13), both ends of the circular guide rail (9) are connected to the front and rear sides of the extension propulsion part (10), the push oil cylinder (13) is a two-way piston rod output structure, two sliding frames (12) are respectively connected to the two ends of the piston rod of the push oil cylinder (13), and a one-way shift block (11) is provided on the sliding frame (12); the cutting part (3) also includes a cutting part box (44), and the driving power of the cutting part (3), the transmission box (33), and the first spiral conveying rod (37) are all arranged In the cutting part box (44), a plurality of propulsion grooves are provided on both sides of the cutting part box (44) and can cooperate with the one-way shift block (11) on the sliding frame (12). The first spiral conveying rod (37) of the cutting part (3) is driven by the transmission box (33) of the cutting part (3); the extension arm (2) includes at least one extension arm unit, and the extension arm unit includes an outer box (29), two parallel second spiral conveying rods rotatably arranged in the outer box (29), and a plurality of propulsion grooves can be provided on both sides of the cutting part box (44) to cooperate with the one-way shift block (11) on the sliding frame (12). Rod (30), a plurality of pushing grooves that can cooperate with the one-way shift block (11) on the sliding frame (12) are respectively provided on both sides of the outer box body (29) of the extending arm unit, and the butt end of the first spiral conveying rod (37) and both ends of the second spiral conveying rod (30) are provided with a plug-in butt structure, and the extending arm units and the extending arm unit and the cutting part box body (44) of the cutting part (3) are connected by a connecting pin through the outer box body (29) of the extending arm unit; The extending arm propulsion mechanism docks the extending arm / cutting part at the side to advance or retract, and the extending arm propulsion mechanism does not occupy the rear space of the extending arm.

2. The extended arm combined coal mining machine according to claim 1, characterized in that: The drill bit of the cutting part (3) is a six-axis linkage structure.

3. The extended arm combined coal mining machine according to claim 1, characterized in that: The main machine (1) is symmetrically provided with four sets of positioning and fixing parts (23) at the left and right ends of the extension propulsion part (10). Each set of positioning and fixing parts (23) includes a fixed oil cylinder (8), an adjustment oil cylinder (24), a limit rod (41), and a guide sleeve bracket (7). The guide sleeve bracket (7) is fixed to the end of the extension propulsion part (10). One end of the fixed oil cylinder (8) is movably matched with the sleeve of the guide sleeve bracket (7), and the other end thereof is connected to the extension propulsion part (10). The adjustment oil cylinder (24) is hinged between the guide sleeve bracket (7) and the walking chassis (17) of the main machine (1). One end of the limit rod (41) is hinged with the guide sleeve bracket (7), and the other end thereof is movably matched with the sleeve fixed on the walking chassis (17) in a sliding manner.

4. The extended arm combined coal mining machine according to claim 1, characterized in that: The upper surface of the outer box body (29) of the extension arm unit is a smooth surface.

5. The extended arm combined coal mining machine according to claim 1, characterized in that: Ventilation ducts (38) are respectively provided on both sides of the outer box (29) of the extension arm unit.

6. The extended arm combined coal mining machine according to claim 1, characterized in that: Limiting oil cylinders (20) are respectively provided on the front and rear sides of the extension propulsion portion (10) corresponding to the extension arm propulsion channel (40).

7. The extended arm combined coal mining machine according to claim 1, characterized in that: The traveling mechanism of the main machine (1) is two sets of crawler traveling mechanisms, and the chassis brackets of the two sets of crawler traveling mechanisms are hingedly connected through connecting rods.

8. The extended arm combined coal mining machine according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: A transport portion (15) is provided at the lower portion of the main machine (1). The transport portion (15) is a belt conveying mechanism. The transport portion (15) is bottom-mounted. The conveying belt (16) of the transport portion (15) passes through a reserved gap of a walking chassis (17) of the main machine (1).

9. The extended arm combined coal mining machine according to claim 8, characterized in that: The output end of the transport portion (15) is higher than the portion passed by the reserved gap of the traveling chassis (17) of the main machine (1).

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