阅读说明：本技术 一种接长臂式联合采煤机 (Extension arm type combined coal mining machine ) 是由 刘航 刘会国 张长华 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种接长臂式联合采煤机,是一种适用于薄煤层开采的采煤机械。其包括主机、接长臂、截割部,主机上设有接长推进部,主机的前后两侧均可布置接长臂和截割部,在接长推进部两端对称设有接长臂推进机构；截割部的驱动动力、传动箱、螺旋输送杆均设置在截割部箱体内；接长臂包括有至少一个接长臂单元,接长臂单元包括外箱体、设置在外箱体内的两根螺旋输送杆,接长臂单元之间及接长臂单元与截割部之间均通过接长臂单元的外箱体利用连接销轴连接。通过主机推进机构的推进,截割部的电动机带动钻头割煤,螺旋输送杆运煤,通过不停车加接接长臂,达到预定的开采深度,解决了以往钻煤机断续生产效率低的问题,实现了煤炭的连续安全高效开采。(The invention discloses an extended arm type combined coal mining machine, which is a coal mining machine suitable for thin coal seam mining. The cutting machine comprises a main machine, an extension arm and a cutting part, wherein the main machine is provided with an extension propelling part, the front side and the rear side of the main machine can be respectively provided with the extension arm and the cutting part, and two ends of the extension propelling part are symmetrically provided with extension arm propelling mechanisms; the driving power, the transmission case and the spiral conveying rod of the cutting part are all arranged in the cutting part box body; the extension arm comprises at least one extension arm unit, the extension arm unit comprises an outer box body and two spiral conveying rods arranged in the outer box body, and the extension arm units and the extension arm unit and the cutting part are connected through the outer box body of the extension arm unit by using connecting pin shafts. Through the propulsion of the main engine propulsion mechanism, the motor of the cutting part drives the drill bit to cut coal, the spiral conveying rod conveys the coal, the preset mining depth is reached through the non-stop additional connection of the extension arm, the problem of low intermittent production efficiency of the conventional coal drilling machine is solved, and the continuous, safe and efficient mining of the coal is realized.)

1. The utility model provides an extend arm formula shearer loader, includes host computer (1), extends arm (2), cutting units (3), and cutting units (3) include transmission case (33), drill bit and two parallel arrangement's first auger delivery pole (37), host computer (1) lower part is provided with running gear, characterized by: the main machine (1) is provided with an extension propelling part (10), the extension propelling part (10) is provided with an extension arm propelling channel (40), the front side and the rear side of the main machine (1) corresponding to the extension arm propelling passage (40) can be provided with an extension arm (2) and a cutting part (3), the left end and the right end of the lengthening propulsion part (10) are symmetrically provided with lengthening arm propulsion mechanisms, the extension arm propulsion mechanism comprises a circular guide rail (9), two sliding frames (12) and a pushing oil cylinder (13), wherein the two sliding frames (12) are arranged on the circular guide rail (9) in a sliding mode, the two ends of the circular guide rail (9) are connected with the front side and the rear side of the extension propulsion part (10), the pushing oil cylinder (13) is of a bidirectional piston rod output structure, the two sliding frames (12) are respectively connected with the two ends of a piston rod of the pushing oil cylinder (13), and a one-way shifting block (11) is arranged on each sliding frame (12); the cutting part (3) further comprises a cutting part box body (44), the driving power, the transmission box (33) and the first spiral conveying rod (37) of the cutting part (3) are all arranged in the cutting part box body (44), a plurality of propelling grooves matched with the one-way shifting blocks (11) on the sliding frame (12) are formed in the two sides of the cutting part box body (44), and 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) comprises at least one extension arm unit, the extension arm unit comprises an outer box body (29) and two second spiral conveying rods (30) which are rotatably arranged in the outer box body (29) and are arranged in parallel, a plurality of propelling grooves matched with the one-way shifting blocks (11) on the sliding frame (12) are respectively arranged on two sides of the outer box body (29) of the extension arm unit, plug-in type butt joint structures are respectively arranged at the butt joint end of the first spiral conveying rod (37) and two ends of the second spiral conveying rods (30), and the extension arm unit and the cutting part box body (44) of the cutting part (3) are connected through the outer box body (29) of the extension arm unit by using connecting pin shafts.

2. The extension arm shearer loader of claim 1, wherein: the drill bit of the cutting part (3) is of a six-axis linkage structure.

3. The extension arm shearer loader of claim 1, wherein: four sets of positioning fixing parts (23) are symmetrically arranged at the left end and the right end of the lengthening propulsion part (10) on the host (1), each set of positioning fixing part (23) comprises a fixing oil cylinder (8), an adjusting oil cylinder (24), a limiting rod (41) and a guide sleeve support (7), the guide sleeve support (7) is fixed at the end part of the lengthening propulsion part (10), one end of the fixing oil cylinder (8) is movably matched with a sleeve of the guide sleeve support (7), the other end of the fixing oil cylinder is connected with the lengthening propulsion part (10), the adjusting oil cylinder (24) is hinged between the guide sleeve support (7) and a walking chassis (17) of the host (1), one end of the limiting rod (41) is hinged with the guide sleeve support (7), and the other end of the limiting rod is movably matched with the sleeve fixed on the walking chassis (17) in a sliding mode up and down mode.

4. The extension arm shearer loader of claim 1, wherein: the upper surface of the outer case (29) of the extension arm unit is a smooth surface.

5. The extension arm shearer loader of claim 1, wherein: ventilating ducts (38) are respectively arranged on two sides of an outer box body (29) of the extension arm unit.

6. The extension arm shearer loader of claim 1, wherein: and the front side and the rear side of the lengthening propulsion part (10) are respectively provided with a limiting oil cylinder (20) corresponding to the lengthening arm propulsion channel (40).

7. The extension arm shearer loader of claim 1, wherein: the traveling mechanism of the main machine (1) is two sets of crawler traveling mechanisms, and chassis supports of the two sets of crawler traveling mechanisms are hinged through connecting rods.

8. An extended arm shearer loader according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, wherein: the utility model discloses a portable transportation system, including host computer (1), host computer (1) lower part is provided with transportation portion (15), transportation portion (15) are belt conveyor, transportation portion (15) are the bottom-mounted formula, the conveyor belt (16) of transportation portion (15) by the reservation space of walking chassis (17) of host computer (1) passes through.

9. The extension arm shearer loader of claim 8, wherein: the output end of the transportation part (15) is higher than the part passed by the reserved gap of the walking chassis (17) of the host (1).

Technical Field

The invention relates to an extended arm type combined coal mining machine, and belongs to the technical field of coal mining equipment.

Background

At present, most of the mechanized coal mining methods are performed on a stope face with the length of about 100 meters, and the method is composed of coal mining machinery, transportation machinery, roof support, goaf treatment and the like, namely, long-wall coal mining. The coal falling equipment of the coal mining mode mainly comprises a drum shearer and a coal planer, the whole coal mining system is complex, the number of used equipment and workers is large, and the problems of high cost, difficult management and poor safety exist. Particularly, for thin coal seams with the thickness of less than 1m, the above problems are particularly prominent due to the limitation of operation space, so that the thin coal seams of many coal mines are often abandoned and not mined, and a great deal of resources are wasted.

In recent years, a three-axis linkage type auger mining machine for mining a thin coal seam by adopting a strip mode and a four-axis auger mining machine (coal drilling machine) have appeared, and although the above coal mining machine can realize unmanned face mining of the thin coal seam, the coal mining machine cannot be popularized and applied due to the following defects:

(1) and low efficiency: due to the limitation of the structure and the working principle, the operation mode is intermittent production, namely, drilling is stopped for one section to perform time-consuming and labor-consuming drilling tool butt joint work (the connection between a power part of a main machine and a drilling tool needs to be disconnected, and then the drilling tool is connected again), the real coal production time is short (taking a 1.5-meter long drill rod as an example, coal mining drilling is performed for one section for 2 minutes, and butt joint needs 10 minutes), and the production efficiency is low;

(2) and the failure rate is high: the connection of the drilling tool needs to take torque transmission and axial locking into consideration, so that the drilling tool is complex in connection structure and complicated in operation, the phenomena of locking and unlocking difficulty frequently occur, the auxiliary time is too long, and the connection of the drill rod is easy to break off and fall into a drill hole;

(3) and the inevitable roof fall phenomenon in the drilling hole of the mine, the processing is extremely difficult when the pressure drilling phenomenon occurs, and even the result of abandoning the drilling tool is caused, so that the use cost is high, and the adaptability is poor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a long-arm type combined coal mining machine, which aims to solve the problems that in the prior art, a drum coal mining machine and a coal planer cannot be used for mining in the mining of a thin coal seam, and a coal drilling machine can be used for mining but has low overall efficiency, high failure rate, high use cost and poor adaptability.

The invention is realized by the following technical scheme: the utility model provides a connect long arm formula coal-winning machine, includes the host computer, connects long arm, cutting units includes transmission case, drill bit and two parallel arrangement's first auger delivery pole, the host computer lower part is provided with running gear, characterized by: the main machine is provided with an extension propulsion part, the extension propulsion part is provided with an extension arm propulsion channel, the front side and the rear side of the main machine are respectively provided with an extension arm and a cutting part corresponding to the extension arm propulsion channel, the left end and the right end of the extension propulsion part are symmetrically provided with extension arm propulsion mechanisms, each extension arm propulsion mechanism comprises a circular guide rail, two sliding frames and a pushing oil cylinder, the two sliding frames are slidably arranged on the circular guide rail, the two ends of the circular guide rail are connected with the front side and the rear side of the extension propulsion part, the pushing oil cylinder is of a bidirectional piston rod output structure, the two sliding frames are respectively connected with the two ends of a piston rod of the pushing oil cylinder, and the sliding frames are provided with unidirectional shifting blocks; the cutting part also comprises a cutting part box body, the driving power, the transmission case and the first spiral conveying rod of the cutting part are all arranged in the cutting part box body, a plurality of propelling grooves which can be matched with the one-way shifting blocks on the sliding frame are arranged on two sides of the cutting part box body, and the first spiral conveying rod of the cutting part is transmitted by the transmission case of the cutting part; the extension arm comprises at least one extension arm unit, the extension arm unit comprises an outer box body and two second spiral conveying rods which are rotatably arranged in the outer box body and are in parallel arrangement, a plurality of propelling grooves matched with one-way shifting blocks on the sliding frame are respectively arranged on two sides of the outer box body of the extension arm unit, the butt joint end of the first spiral conveying rod and the two ends of the second spiral conveying rods are respectively provided with a plug-in type butt joint structure, and the extension arm unit and the cutting part box body of the cutting part are connected through the outer box body of the extension arm unit by utilizing connecting pin shafts.

The working principle of the invention is as follows: the running gear that host computer accessible lower part set up walks, and the host computer is arranged in the back production tunnel, and cutting unit is connected with lengthening the arm, and lengthening arm advancing mechanism who lengthens advancing unit promotes lengthening arm and cutting unit through pushing the hydro-cylinder and impels to one side coal seam, and cutting unit's drill bit and first auger delivery pole rotate under cutting unit's drive power drive, cut the coal through the drill bit rotation, and the coal of mining is carried out through first auger delivery pole, second auger delivery pole. The extension arm can connect the extension arm unit to be extended according to the mining depth, and when the extension arm is in butt joint, the outer box body of the single extension arm unit is connected through the pin shaft, so that the screw conveying rod does not need to be axially fixed. Similarly, when the extension arm is disassembled, the connecting pin shaft between the extension arm units is pulled out, so that the separation can be realized. The invention can realize the propulsion of the cutting part and the extension arm in two directions, and realize bidirectional mining, namely after the mining on one side is finished, the cutting part and the extension arm on the other side can be propelled to mine the coal on the other side by the extension arm propulsion mechanism of the extension propulsion part after the propulsion arm on the side is withdrawn, thereby greatly improving the production efficiency.

Furthermore, in order to improve the coal mining quantity, a drill bit of the cutting part is of a six-shaft linkage type structure.

Furthermore, four sets of positioning fixing parts are symmetrically arranged at the left end and the right end of the lengthening propulsion part on the host, each set of positioning fixing part comprises a fixing oil cylinder, an adjusting oil cylinder, a limiting rod and a guide sleeve support, the guide sleeve support is fixed at the end part of the lengthening propulsion part, one end of the fixing oil cylinder is movably matched with a sleeve of the guide sleeve support, the other end of the fixing oil cylinder is connected with the lengthening propulsion part, the adjusting oil cylinder is hinged between the guide sleeve support and a walking chassis of the host, one end of the limiting rod is hinged with the guide sleeve support, and the other end of the limiting rod is movably matched with the sleeve fixed on the walking chassis in a sliding mode. Various operation postures of the coal mining machine, such as the hole opening position, the propulsion pitch angle, the center height and the like, can be adjusted by adjusting the lifting of the oil cylinder so as to fit geological conditions such as the corresponding roadway coal seam position and the like. The limiting rod is arranged because the adjusting oil cylinder is not suitable for bearing lateral force, and the limiting rod is used for limiting the relative position of the lengthening propulsion part and the travelling mechanism in the horizontal direction. The cylinder barrel of the fixed oil cylinder of the positioning fixing part can extend out along the sleeve of the guide sleeve support and prop against two sides of the roadway, and the functions of fixing the working posture of the whole machine and balancing the propulsion resistance are achieved.

Further, in order to facilitate the pushing of the extension arm, the upper surface of the outer case of the extension arm unit is a smooth surface. The upper surface of the outer box body is a smooth surface, so that the problem of blocking caused by roof fall can be effectively prevented, and the extension arm and the cutting part can be ensured to be smoothly retracted when the extension arm and the cutting part are retracted.

Furthermore, ventilation ducts are respectively arranged on two sides of the outer box body of the extension arm unit. The ventilation pipeline is used for ventilation in the mining hole so as to control the gas content to be within a safe range.

Furthermore, the front side and the rear side of the extension pushing part are respectively provided with a limiting oil cylinder corresponding to the extension arm pushing channel. The extended arm unit which is pushed (or retracted) to the position can be limited through the limiting oil cylinder, and the butt joint (or the separation) is convenient.

Furthermore, the traveling mechanisms of the main machine are two sets of crawler traveling mechanisms, and chassis supports of the two sets of crawler traveling mechanisms are hinged and connected through a connecting rod. Two sets of crawler belt traveling mechanisms are adopted, so that the traction force is large, the adaptability is strong, and the maneuverability and the flexibility of the equipment are good.

Furthermore, in order to conveniently convey the mined coal, a conveying part is arranged on the lower portion of the main machine and is a belt conveying mechanism, the conveying part is arranged at the bottom, and a conveying belt of the conveying part is located in a reserved gap of a walking chassis of the main machine. The transportation part adopts a bottom-mounted structure, so that the coal mining center height of the unit can be reduced.

Further, in order to be convenient for being connected with subsequent conveying equipment in an abutting mode, the output end of the conveying part is higher than the part, passing through the reserved gap, of the walking chassis of the main machine.

The invention has the beneficial effects that: according to the invention, the cutting part box body is arranged outside the cutting part, and the driving power of the cutting part, the spiral conveying rod and the like are arranged in the cutting part box body, so that a power preposed arrangement structure of the cutting part is formed, so that the spiral conveying rod in the subsequently butted extension arm is only driven to rotate passively, a continuous production mode of non-stop butting can be realized, the problem that the auger drill needs to be stopped for butting in the existing coal mining machine is thoroughly solved, the auxiliary time is basically eliminated, and only this item can improve the production efficiency by 3 times; the extension arm adopts the design of the extension arm unit, the structural design is simple, the butt joint of the extension arm is simple, the butt joint can be realized only by connecting the outer box body without rotary motion of the extension arm unit, the screw rod does not need to be axially fixed, the operation is simple, the connection is reliable, the disjointing phenomenon does not exist, and the box body type structural design of the extension arm unit is convenient to push and free of clamping stagnation when the extension arm unit is withdrawn; according to the invention, the cutting part and the extension arm are respectively arranged on the two sides of the host, so that the function of bidirectional propulsion of the extension arm to mine coal can be realized, both sides can mine coal under the condition of arranging one roadway, the cost for preparing the roadway is saved, and when one side is mined, the working mode that one side returns to the other side for propulsion can be realized only by installing one set of cutting part on the other side, so that the operation is simple, the equipment needs less workers, the labor environment of workers is good, the intensity is low, and the production efficiency is high; the bottom-mounted conveying part is arranged, so that the mined coal can be directly conveyed to the main mine conveying system, the configuration of the mine conveying system is simplified, and the mining cost is reduced. The invention realizes the production mode of continuous and efficient coal mining operation with convenient operation and no-stop butt joint, has strong adaptability and can realize unmanned face mining. The coal mining machine is applied to mining the thin coal seam, solves the problems that the existing equipment cannot mine the thin coal seam in a coal mining mode or can mine the thin coal seam but has low efficiency, high cost, poor reliability and poor safety, realizes the efficient, safe and convenient mining of the unmanned working face of the thin coal seam, has much lower mining cost than other mining modes, and can bring economic and social benefits to the mine.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of FIG. 1;

FIG. 3 is a top view of the elongated arm unit of the present invention;

FIG. 4 is a schematic top view of the cutting section of the present invention;

FIG. 5 is a schematic cross-sectional view of the cutting section of the present invention;

in the figure, 1, a main frame, 2, an extension arm, 3, a cutting part, 4, an electric control hydraulic system, 5, an electric drum 6, a support, 7, a guide sleeve support, 8, a fixed oil cylinder, 9, a circular guide rail, 10, an extension propelling part, 11, a one-way shifting block, 12, a sliding frame, 13, a pushing oil cylinder, 14, a guide roller, 15, a transportation part, 16, a conveying belt, 17, a walking chassis, 18, a compression roller, 19, a window-shaped frame, 20, a limiting oil cylinder, 21, a connecting rod, 22, a carrier roller, 23, a positioning fixing part, 24, an adjusting oil cylinder, 25, a chassis support, 26, a crawler belt, 27, a hydraulic motor, 28, a connecting pin shaft, 29, a compression roller body, 30, a second spiral conveying rod, 31, a rod support, 32, a drill bit, 33, a transmission box, 34, a speed reducer, 35, a monitoring adjusting system, a ventilating pipeline 36, a motor, 37, a first spiral conveying rod, 38 and a second spiral conveying rod, 39. the extension arm comprises a propelling groove 40 of the extension arm, a propelling channel 41 of the extension arm, a limiting rod 42, a propelling groove of the cutting part, a U-shaped groove 43, a U-shaped groove 44 and a cutting part box body.

Detailed Description

The invention will now be further illustrated by way of non-limiting examples in conjunction with the accompanying drawings:

as shown in the attached drawings, the extension arm type combined miner comprises a main machine 1, an extension arm 2, a cutting part 3 and an electric control hydraulic system 4.

The main machine 1 is an important part of the unit; the machine moving positioning, the bidirectional propelling of the cutting part 3 and the extension arm 2 and the coal transportation of the mining in the coal mining operation are all completed by the part. The main machine 1 includes a traveling chassis 17 and an extension propulsion unit 10. The traveling chassis 17 is a traveling mechanism, and the main body 1 is movable by the traveling mechanism. The running mechanism in the invention can adopt various structural forms of the running mechanism in the prior art, for example, a crawler running mechanism can be adopted. In order to improve the adaptability, maneuverability and flexibility of the equipment, the travelling mechanism of the main machine 1 preferably adopts two sets of crawler travelling mechanisms which are arranged in the front and back direction according to the movement direction. The crawler traveling mechanisms are in the prior art, each set of crawler traveling mechanism comprises a chassis support 25, two crawlers 26, a driving mechanism and the like, and the driving mechanism is driven by a hydraulic motor 27. The chassis supports 25 of the two sets of crawler belt traveling mechanisms are hinged through a connecting rod 21. The hydraulic motor 27 is provided with a speed reducer, and the crawler belt 26 is driven by the hydraulic motor 27 to move the main body 1. The lengthening propulsion part 10 is arranged on the upper part of a traveling chassis 17 of the main machine 1, the lengthening propulsion part 10 is of a frame structure, the front end and the rear end of the lengthening propulsion part are two symmetrical window-shaped frames 19 formed by welding thick steel plates, and a rectangular frame in the middle of the two window-shaped frames 19 is an lengthening arm propulsion channel 40 and is a propulsion channel of the lengthening arm 2. Extension arm advancing mechanism is provided with in both ends symmetry about extension propulsive part 10, extension arm advancing mechanism includes circular guide rail 9, two slip frame 12, the lapse hydro-cylinder 13 of sliding the setting on circular guide rail 9, and the both ends of circular guide rail 9 are connected with the window type frame 19 of both sides around extension propulsive part 10, and lapse hydro-cylinder 13 is two-way piston rod output structure, can satisfy the two-way propulsive requirement of butt joint of extension arm 2, and lapse hydro-cylinder 13 is installed in the U type groove 43 of window type frame 19, and the cylinder body of lapse hydro-cylinder 13 passes through the boss card in the middle of the cylinder body and realizes in U type groove 43 with the fixed of extension propulsive part, and two slip frames 12 are articulated with the piston rod both ends of lapse hydro-cylinder 13 respectively, be connected with one-way shifting block 11 on the slip frame 12, one-way shifting block 11 is used for promoting the extension arm. The sliding frame 12 can be driven to slide along the circular guide rail 9 by the pushing oil cylinder 13, and the extension arm 2 is pushed to be pushed by the one-way shifting block 11 arranged on the sliding frame 12.

The main machine 1 is symmetrically arranged, and the front side and the rear side of the main machine 1 corresponding to the extension arm propelling passage 40 can be respectively provided with the extension arm 2 and the cutting part 3.

The extension arm 2 comprises at least one extension arm unit, and the extension arm unit comprises an outer box 29 and two second spiral conveying rods 30 which are rotatably arranged in the outer box 29 and are arranged in parallel. The outer case 29 is a rectangular case formed by welding steel plates, and a honeycomb structure may be used to increase rigidity and reduce weight. To facilitate extension arm advancement and retraction and to prevent roof collapse causing jamming problems, the upper surface of the outer housing 29 of the extension arm unit is preferably a smooth surface. The upper part of the cutting part is provided with a rectangular pipeline groove for storing a motor cable of the cutting part 3, a cooling water pipe and a monitoring detection cable. The two sides of the outer box 29 are respectively provided with a plurality of pushing grooves 39 which can be matched with the one-way shifting blocks 11 on the sliding frame 12. The extension arm pushing mechanism can push the extension arm 2 to move by inserting the one-way shifting block 11 into the pushing groove 39. Two second auger delivery shafts 30 are provided in the middle of the box by shaft supports 31 for coal transport. The two ends of the second conveying screw 30 are provided with plug-in type butt-joint structures, which can adopt various plug-in type butt-joint structure forms in the prior art, such as a quincunx type coupling structure form, or adopt other structure forms. When the extension arm units are connected, the connection between the extension arm units is connected by the connecting shaft pins 28 arranged on two sides of the outer box body 29, and the second spiral conveying rods 30 of the extension arm units are in butt joint connection through insertion. The connection of the elongated arm unit to the cutting part 3 is also connected by means of a connecting pin 28 arranged in the outer casing 29. The outer box 29 structure adopted by the extension arm unit greatly simplifies the butt joint operation of the extension arm, can prevent the blocking of roof fall in the hole and ensures the smooth withdrawal. The number of the configured extension arm units is determined according to the requirement of the mining depth. For ventilation, the present invention further provides ventilation ducts 38 on both sides of the outer case 29 of the extension arm unit, and the ventilation ducts 38 are used for ventilation in the mining holes to control the gas content within a safe range. In the present invention, a limit cylinder 20 is further disposed on the upper side of the window frame 19 to limit the extension arm 2 that has been pushed (or retracted) to a position, thereby facilitating docking (or undocking).

The cutting part 3 is a key coal dropping working part of the whole unit. The cutting part 3 comprises a cutting part box body 44, a transmission case 33, a plurality of drill bits 32, two first spiral conveying rods 37 arranged in parallel, a speed reducer 34, a motor 36 and a monitoring and adjusting system 35. The cutting part box body 44 is a rectangular box body, and the transmission case 33, the first spiral conveying rod 37, the speed reducer 34, the motor 36 and the monitoring and adjusting system 35 are all installed in the cutting part box body 44. The butt end of the first auger screw 37 is also provided with a plug-in butt structure that can be butted against the second auger screw 30 of the extension arm unit. The plug-in docking structure at the docking end of the first auger screw 37 mates with the plug-in docking structure at the end of the second auger screw 30. Both sides of the cutting part box body 44 are provided with a plurality of propelling grooves 42 which can be matched with the unidirectional shifting blocks 11 on the sliding frame 12. The extension arm pushing mechanism can push the cutting part 3 to move by inserting the unidirectional shifting block 11 into the pushing groove 42. A plurality of transmission shafts are arranged in the transmission case 33, each transmission shaft is engaged and driven through a gear arranged on the transmission shaft, the drill bit 32 is connected with the corresponding transmission shaft of the transmission case 33 at the front part of the transmission case 33, and the two first spiral conveying rods 37 are connected with the corresponding transmission shaft of the transmission case 33 at the rear part of the transmission case 33. In the invention, the cutting part 3 adopts a power preposed arrangement structure, the power of a motor 36 is transmitted to each drill bit 32 and two first spiral conveying rods 37 through a speed reducer 34 and a transmission box 33, the drill bits 32 rotate to cut coal, and the first spiral conveying rods 37 rotate to convey the coal to the second spiral conveying rods 30 of the extension arm 2 to be continuously conveyed out, thereby realizing the coal mining. Due to the limitation of the size of the drilled hole, the motor 36 of the cutting part 3 is preferably a water-cooled motor, the speed reducer 34 is in a planetary gear type, and the whole structure is compactly arranged. In order to improve the coal mining quantity, the drill bits of the cutting part 3 adopt a six-shaft linkage structure, and six drill bits 32 are respectively connected with a transmission shaft in a transmission case 33. The cutting part 3 of the present invention can be driven by one set of driving power, in this embodiment, two sets of driving power are used, and each set of driving power drives three drills and one second auger screw 30. By adopting a six-axis linkage type drill bit arrangement structure, a rectangular hole with the width of about 3 meters can be mined by one-time propulsion, and the one-time coal mining quantity is greatly improved. The monitoring and adjusting system 35 is used for detecting gas in the mining hole, identifying coal rocks and adjusting drilling postures, so that the safety production and the cleanliness of the mined coal are ensured, and the monitoring and adjusting system 35 is the prior art.

The electrically controlled hydraulic system 4 comprises an electric control system and a hydraulic system. The electric control system is a programming sequence control part of the electric power introduction, output and automatic system of the coal mining machine, consists of a switch, a control box and an inductor, and meets the underground explosion-proof requirement. The hydraulic system provides power and control for the running mechanism, each oil cylinder, the motor and other actuating mechanisms. Both the electric control system and the hydraulic system are in the prior art.

In order to fix and adjust the operation posture of the whole machine during coal mining and convey mined coal, the main machine 1 of the invention is also provided with a positioning fixing part 23 and a conveying part 15. Wherein, the walking chassis 17 is fixedly connected with the transportation part 15, and the positioning fixing part 23 is fixedly connected with the lengthening propulsion part 10. The chassis frame 25 of the crawler traveling mechanism is provided with a connecting structure for connecting the positioning fixing portion 23 and the transporting portion 15. The chassis frame 25 reserves an installation position of the conveyor belt 16 of the transport section 15.

The positioning fixing parts 23 are four sets symmetrically arranged at the left end and the right end of the lengthening propulsion part 10, each set of positioning fixing part 23 comprises a fixing oil cylinder 8, an adjusting oil cylinder 24, a limiting rod 41 and a guide sleeve support 7, the guide sleeve support 7 is fixed at the end part of the lengthening propulsion part 10, the guide sleeve support 7 is provided with a sleeve, a cylinder barrel of the fixing oil cylinder 8 is movably matched with the sleeve barrel of the guide sleeve support 7, the other end of the fixing oil cylinder 8 is connected with the lengthening propulsion part 10, and the adjusting oil cylinder 24 is hinged between the guide sleeve support 7 and a traveling chassis 17 of the host 1. One end of the limiting rod 41 is hinged with the guide sleeve bracket 7, and the other end thereof can move up and down and is in sliding fit with a sleeve fixed on the walking chassis 17. The limiting rod is used for limiting the relative position of the lengthening propulsion part and the travelling mechanism in the horizontal direction, and preventing the lateral stress of the adjusting oil cylinder. The lifting of the adjusting oil cylinder 24 can be operated to adjust various operation postures of the coal mining machine, such as the position of the hole, the propulsion pitch angle, the center height and the like, so as to fit geological conditions such as the position of a corresponding roadway coal seam and the like. The cylinder barrel can extend out along the sleeve of the guide sleeve bracket 7 and prop against two sides of a roadway by operating the fixed oil cylinder 8, so that the functions of fixing the working posture of the unit and balancing the propulsion resistance are achieved.

The transportation part 15 is arranged at the lower part of the main machine 1 and is used for conveying the mined coal out. The transport section 15 is a belt conveying mechanism. The conveying part 15 consists of a motorized roller 5, a press roller 18, a carrier roller 22, a guide roller 14, a conveying belt 16 and a bracket 6. In order to reduce the height of the coal mining center of the unit, the conveying part 15 adopts a bottom-mounted structure, the conveying part 15 is installed on a walking chassis 17 through a bracket 6, and a conveying belt 16 of the conveying part 15 passes through a reserved gap of the walking chassis 17. In order to facilitate the butt joint with the subsequent conveying equipment, the output end of the conveying part 15 is higher than the part passing through the reserved gap of the walking chassis 17 of the main machine 1, namely, the roller coal dropping is lifted again at the position where the conveying belt 16 reaches the outside of the lengthening propelling part 10 without space limitation so as to adapt to the continuation of the subsequent conveying equipment. The coal recovered by the cutting part 3 is conveyed out of the drill hole through the spiral conveying rod of the lengthening arm 2, falls onto the conveying belt 16 at the bottom hole of the lengthening propelling part 10 and is conveyed out.

The working principle of the invention is as follows:

the main machine 1 is arranged in a stoping roadway, is fixed after the propulsion state is adjusted, the lengthening propulsion part 10 pushes the lengthening arm 2 and the cutting part 3 to propel to a coal seam on one side, a motor reducer of the cutting part 3 drives a drill bit 32 to cut coal, a spiral conveying rod conveys the coal, and the coal mining operation of the preset depth is achieved by additionally connecting the lengthening arm 2. The specific working steps are introduced as follows:

(1) moving and positioning the machine:

the main machine 1 is operated to drive the caterpillar tracks 26 by operating the hydraulic motors 27 of the walking chassis 17, the main machine 1 is moved to a required coal mining position in a roadway, the adjusting oil cylinders 24 are operated to enable the height and the gradient of the machine frame to be consistent with the coal seam to be mined, then the fixed oil cylinders 8 are operated to extend out and support the machine frame on two sides of the roadway, the main machine 1 is oriented and fixed, and then coal mining operation can be carried out.

(2) And coal mining operation:

when coal is mined, a set of cutting part 3 is placed at the position of the window-shaped frame 19 of the main machine 1, the electric control system is operated to start the motor 36 of the cutting part 3, the transmission case 33 is driven by the speed reducer 34, the drill bit 32 and the first spiral conveying rod 37 are driven to rotate and are pushed to the coal bed under the pushing action of the pushing cylinder 13 of the lengthening pushing part 10, the drill bit 32 rotates to cut coal, the first spiral conveying rod 37 rotates to convey coal, and the coal falls on the conveying belt 16 of the conveying part 15 through a hole at the bottom of the lengthening pushing part 10 and is conveyed out.

After the cutting part 3 is drilled in place, a set of extension arm unit can be placed at the butt joint position of the window-shaped frame 19 under the condition that the cutting part 3 does not stop, the pushing cylinder 13 is started to push the extension arm unit to be in butt joint with the cutting part 3, and the connection pin is inserted for connection. And continuing to advance the extension arm 2 to carry out coal mining operation. The above procedure is repeated one section by one section to advance the extension arm 2 until a predetermined coal mining depth (typically around 60 m) is reached. Because the function of butt joint of the long arm 2 without stopping is realized, namely the front cutting part 3 can realize continuous coal mining, and the spiral conveying rod of the rear long arm 2 only rotates to transport coal outwards, the continuous production can be realized, and the production efficiency is greatly improved. Moreover, the butt joint of the extension arm 2 is only connected with the outer box 29 without rotary motion, so that the labor is reduced, the operation is simple, and the connection is reliable.

After the mining of one side is finished, the other set of cutting part 3 is connected in the other side direction, the motor 36 is started reversely, the pushing oil cylinder 13 is operated to withdraw the cutting part 3 and the extension arm 2 on the mined side and simultaneously push the cutting part 3 and the extension arm 2 in the other side direction into the other side for mining coal until the predetermined depth is reached, and at the moment, the extension arm 2 on the mined side is also withdrawn completely. The realization of the function enables the quitting operation of one side to be perfectly combined with the propelling operation of the other side, greatly simplifies the operation procedure and improves the production efficiency.

And after the two sides are completely mined, executing a withdrawal program, and sequentially withdrawing the extension arm 2 from the drilled hole. Because the extension arm unit adopts a box body structure, the connection is simple and reliable, only the connecting pin is pulled out when the connection is disconnected, and the operation is simple. The axial direction of the upper surface of the outer box body 29 is a smooth surface, so that the problem of blocking caused by roof fall can be effectively prevented, the extension arm 2 and the cutting part 3 can be smoothly retracted, and the adaptability of the equipment to complex geological conditions (particularly roof conditions) is improved.

And then, operating the hydraulic system to withdraw the fixed oil cylinder 8, starting the walking crawler belt 26, driving the main machine 1 to move to the next mining position along the roadway, and starting the coal mining work of a second rectangular hole. Because the invention designs two sets of crawler belt linked running gear, the traction force is large, the adaptability is strong, the machine moving time is greatly shortened, and the purpose of quickly moving the machine without disassembling the machine for a longer distance can be realized, and the maneuverability and the flexibility are greatly improved.

In conclusion, the invention can realize the continuous production mode of unmanned working face mining and non-stop butt joint of the thin coal seam, the butt joint of the extension arm 2 is simple, no clamping stagnation phenomenon exists when the extension arm is withdrawn, all the working procedures of coal breaking, coal loading, coal transporting and the like in the working face can be safely and efficiently completed, and various supporting, transporting and other equipment are not required to be matched. Because the equipment maintenance of the working face is also carried out in the roadway outside the working face, the invention enables workers to get rid of dangerous working places, frees the workers from heavy physical labor and severe working environment, greatly improves the safety, occupies less personnel, has high labor productivity, can develop coal seams which cannot be exploited or are difficult to exploit by using a common method, and improves the resource utilization rate. The continuous production mode is realized, so that the production efficiency of the continuous production mode is far higher than that of an auger coal mining machine and common coal mining equipment, the continuous production mode is applied to mining of a thin coal seam, the problems that the coal mining mode of the conventional equipment cannot be used or can be used for mining but is low in efficiency, high in cost, poor in reliability and poor in safety are solved, and economic and social benefits can be brought to mines.

Although the present invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Other parts in this embodiment are the prior art, and are not described herein again.