A cutting unit for steeply inclined coal seams and a coal shearer for steeply inclined coal seams with such a cutting unit

Abstract

The present invention discloses a cutting unit for steeply inclined coal seams and a shearer for steeply inclined coal seams having the cutting unit; it includes a machine housing provided with a cutting motor, a transmission mechanism, a rocker arm, a drum, and a lower cutting depth adjustment device; the rocker arm housing of the rocker arm is hinged to the machine housing; two drums are symmetrically connected to both sides of the end of the rocker arm away from the machine housing through a rocker arm connecting axis; a small drum is drivingly connected directly below the rocker arm and is arranged along the length direction of the rocker arm housing and has a length equivalent to that below the rocker arm housing. By arranging the small drum, the coal below the rocker arm can be cleaned, ensuring that the rocker arm can cut downward normally, thereby ensuring the normal operation of coal mining and ensuring the efficiency of coal mining. The present invention has the technical advantages of simple structure and high working efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal shearers, and particularly to a cutting unit for steeply inclined coal seams and a steeply inclined coal seam shearer having the cutting unit. Background Art

[0002] The coal mining industry is the most basic energy industry in China. With the continuous improvement of the industrial mechanization level in China, it has strongly promoted the rapid development of the coal mining machinery industry. Most coal mines in China have generally used coal cutting machines for mechanized coal mining production operations, which has positive significance for reducing the labor intensity of coal miners, improving the production environment of the coal mining face, increasing the production progress, ensuring safe production and the product quality of the finished coal.

[0003] The equipment level of coal mining machinery is one of the important indicators of the coal mine technology level. With the development of coal mining machinery, it is necessary to continuously develop cutting unit coal shearers for steeply inclined coal seams to meet the needs of different coal seam geological conditions. The selection of coal mining machinery depends on the occurrence conditions of the coal seams.

[0004] In view of the above problems, the Chinese patent document discloses "A downcutting machine for steeply inclined coal seams" (Publication No. CN204186385U, Publication Date: March 4, 2015), which discloses a downcutting machine for steeply inclined coal seams. It includes a traction unit, a motor, a transmission part, a rocker arm and a lower cutting depth adjustment device; the transmission part includes a transmission box body, a transmission connecting shaft inside the transmission box body, and a transmission device. The transmission part is connected to a number of rocker arms through the transmission device, and the rotating device corresponds to each rocker arm one by one. Each rocker arm is respectively connected to a number of drums; the traction unit is connected to a traction device to drive the entire downcutting machine to move. When this technology is actually used, there are the following problems. Since drums are symmetrically connected to both sides of each rocker arm, there is no coal cutting function under the rocker arm between the two drums; after the drums cut the coal, the coal remaining under the rocker arm will block the rocker arm, making the rocker arm unable to cut down normally. As a result, the coal shearer cannot carry out the coal cutting work normally, leading to a reduction in the coal cutting efficiency / inability to cut coal. Therefore, it is necessary to improve the existing technology to ensure the coal cutting efficiency of the coal shearer.

[0005] At the same time, due to the relatively complex mechanical structure, high price of the machine, high operation and maintenance management costs, and large volume of the existing coal shearers, the existing coal cutting machines all belong to large-scale mechanical equipment and have great limitations in use. Therefore, it is necessary to develop a steeply inclined coal seam shearer that is suitable for the exploitation of steeply inclined coal seams in China and suitable for coal mining production operations in medium and small coal mines. Summary of the Invention

[0006] The purpose of the present invention is to address the deficiencies of the prior art and to provide a cutting part for steeply inclined coal seams and a steeply inclined coal seam mining machine having the cutting part, which has a simple structure and can clean the coal under the rocker arm and ensure that the rocker arm can cut normally.

[0007] The technical purpose of the present invention is achieved by the following technical solutions:

[0008] A cutting part for steeply inclined coal seams, the cutting part comprising a casing provided with a cutting motor, a transmission mechanism, a rocker arm, a roller and a lower cutting depth adjustment device; the rocker arm housing of the rocker arm is hinged to the casing; two rollers are symmetrically connected to the two sides of one end of the rocker arm away from the casing through a rocker arm connecting axis; a small roller arranged along the length direction of the rocker arm housing and having a length equivalent to that below the rocker arm housing is transmission-connected directly below the rocker arm.

[0009] The transmission mechanism includes a first gear transmission mechanism arranged in the casing and cooperating with the output shaft of the cutting motor, a transmission connecting shaft provided with transmission teeth, a second gear transmission mechanism and a third gear transmission mechanism arranged in the rocker arm housing; one end of the small roller is provided with a spline cooperating with the third gear transmission mechanism; the rocker arm connecting shaft forms a transmission connection with the second gear transmission mechanism; the first gear transmission mechanism drives the second gear transmission mechanism and the third gear transmission mechanism through the transmission connecting shaft, driving the roller and the small roller to rotate.

[0010] The end of the small roller away from the spline is rotatably connected to a mounting seat arranged on the rocker arm housing; the mounting seat is provided with a bearing that matches the end of the small roller, and the mounting seat is connected to the rocker arm housing by a detachable connection structure.

[0011] The small roller body is cylindrical, and is provided with a plurality of groups of first cutting teeth at intervals along the axis direction, and each first cutting tooth is perpendicular to the axis.

[0012] A gap is provided between the first cutting tooth and the rocker arm housing.

[0013] The small roller is provided with at least one second pick which is inclined toward the L-shaped angle direction of the mounting seat and is provided with a gap with the L-shaped angle.

[0014] The small roller comprises a second roller provided with the second pick and a first roller with the first pick, and the second roller is detachably connected to the first roller.

[0015] The middle part of the end of the casing is in a concave shape, and the rocker arm is installed in the groove of the casing.

[0016] The lower cutting depth adjustment device is a hydraulic cylinder device connected to the outer surface of the rocker arm housing and the outer surface of the casing.

[0017] The present invention also provides a steeply inclined coal seam coal mining machine, comprising a variable frequency speed control box, a traction part and a cutting part for the steeply inclined coal seam provided by the present invention.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. A small roller is connected to the lower part of the rocker arm in a transmission manner and is arranged along the length direction of the rocker arm housing and is equal to the length of the lower part of the arm housing. This technical measure can clean the coal under the rocker arm and ensure that the rocker arm can cut normally, thereby ensuring the normal operation of coal mining and the efficiency of coal mining. It has the technical advantages of simple structure and high working efficiency.

[0020] 2. The transmission mechanism of the present invention includes a first gear transmission mechanism arranged in the casing and matched with the output shaft of the cutting motor, a second gear transmission mechanism and a third gear transmission mechanism arranged in the rocker housing; a spline matched with the third gear transmission mechanism is arranged at one end of the small drum; the rocker connecting shaft forms a transmission connection with the second gear transmission mechanism; the first gear transmission mechanism drives the second gear transmission mechanism and the third gear transmission mechanism through the transmission connecting shaft to drive the drum and the small drum to rotate. With this technical measure, the small drum and the large drum share a cutting motor while ensuring that the small drum can work stably. The structure is simple and the stability is high. At the same time, it avoids adding a new motor, thereby effectively reducing the manufacturing cost.

[0021] 3. The small drum body of the present invention is cylindrical, and is provided with multiple groups of first picks at intervals along the axis direction, and each first pick is perpendicular to the axis. A gap is provided between the first pick and the rocker housing. This technical measure can prevent coal blocks from getting stuck between the first picks.

[0022] 4. The end of the small roller away from the spline of the present invention is rotatably connected to a mounting seat provided on the rocker housing; the mounting seat is provided with a bearing that matches the end of the small roller, and the mounting seat is connected to the rocker housing by a detachable connection structure. This technical measure can facilitate disassembly and assembly, thereby replacing / disassembling the small roller. It has the technical advantages of simple structure and easy disassembly and maintenance.

[0023] 5. The small drum of the present invention is provided with at least one second pick which is inclined toward the L-shaped angle of the mounting seat and matches the clearance between the L-shaped angle. The second pick can prevent the gap between the first pick and the mounting seat from being stuck by coal blocks, thereby ensuring the normal operation of the small drum and thus ensuring the working efficiency of coal mining.

[0024] 6. The small roller of the present invention comprises a second roller provided with a second pick and a first roller provided with a first pick, and the second roller is detachably connected to the first roller. The adoption of this technical measure facilitates batch manufacturing and later segmented maintenance. When replacement is required, only one of the rollers needs to be replaced separately.

[0025] 7. The present invention also provides a shearer for steeply inclined coal seams, which includes the cutting part provided by the present invention, and also includes a variable frequency speed regulation control box and a traction part. Since the cutting part provided with a small drum can clean the coal remaining under the rocker arm after coal cutting, it ensures that the rocker arm can smoothly cut downward during coal mining, thus ensuring the coal mining efficiency. The shearer for steeply inclined coal seams adopting the cutting part has the technical advantages of simple structure and high coal mining efficiency. At the same time, by adopting the AC variable frequency speed regulation technology, stepless speed regulation of the traction speed is realized, the electric traction has high efficiency, large traction force and the functions of reverse rotation and overspeed prevention. The shearer for steeply inclined coal seams provided by the present invention is applicable to inclined longwall mining faces with a coal seam dip angle <55°, a coal seam thickness of 0.6 m, and a working face length of about 120 m. It is required that the coal quality hardness f ≤ 3, the roof is moderately stable, the floor undulation is not too large, and the coal seam does not contain hard inclusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural view of the cutting part of the present invention;

[0027] Figure 2 is a schematic structural view of the shearer for steeply inclined coal seams of the present invention;

[0028] Figure 3 is Figure 1 a schematic view of the initial state of the rocker arm and the downward cutting depth adjusting device in

[0029] Figure 4 is Figure 3 a usage state diagram of the downward cutting depth adjusting device of

[0030] Figure 5 is Figure 4 a schematic structural view of the rocker arm in

[0031] Figure 6 is a schematic structural view of the third gear transmission mechanism;

[0032] Reference numerals: 1 - cutting part; 11 - housing; 111 - first gear transmission mechanism; 12 - cutting motor; 13 - rocker arm; 131 - second gear transmission mechanism; 132 - rocker arm connecting shaft; 133 - rocker arm housing; 14 - drum; 15 - transmission connecting shaft; 2 - traction part; 3 - variable frequency speed regulation control box; 4 - downward cutting depth adjusting device; 5 - small drum; 51 - first drum; 511 - first pick; 52 - second drum; 521 - second pick; 53 - third gear transmission mechanism; 6 - mounting seat; 61 - bearing; 62 - L-shaped angle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of the present invention, it should be noted that the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0037] Embodiment 1

[0038] As Figure 1 — Figure 6As shown in the figure, a cutting unit for steeply inclined coal seams, the cutting unit 1 includes a housing 11 provided with a cutting motor 12, a transmission mechanism, a rocker arm 13, a drum 14 and a lower cutting depth adjustment device 4; the rocker arm housing 133 of the rocker arm 13 is hinged to the housing 11; two drums 14 are symmetrically connected to both sides of one end of the rocker arm 13 away from the housing 11 through rocker arm connecting shafts 132; a small drum 5 is connected in a transmission manner directly below the rocker arm 13 and is arranged along the length direction of the rocker arm housing 133 and has a length equivalent to the length below the rocker arm housing 133. By adopting this technical measure, the coal below the rocker arm 13 can be cleared, ensuring that the rocker arm 13 can cut normally downward, thereby ensuring the normal operation of coal mining and ensuring the coal mining efficiency. It has the technical advantages of simple structure and high working efficiency. Among them, the middle part of the end of the housing 11 is in a concave shape, and the rocker arm 13 is installed in the groove of the housing 11. The lower cutting depth adjustment device 4 is a hydraulic cylinder device connected between the outer surface of the rocker arm housing 133 and the outer surface of the housing 11. Specifically, one end of the lower cutting depth adjustment device 4 is connected to the upper part of the front end of the rocker arm housing 133, and the other end is hinged to the upper part of the front end of the housing 11.

[0039] Specifically, the transmission mechanism includes a first gear transmission mechanism 111 arranged in the housing 11 and cooperating with the output shaft of the cutting motor 12, a transmission connecting shaft 15 provided with transmission teeth, a second gear transmission mechanism 131 and a third gear transmission mechanism 53 arranged in the rocker arm housing 133; one end of the small drum 5 is provided with a spline cooperating with the third gear transmission mechanism 53; the rocker arm connecting shaft 132 is in transmission connection with the second gear transmission mechanism 131; the first gear transmission mechanism 111 drives the second gear transmission mechanism 131 and the third gear transmission mechanism 53 through the transmission connecting shaft 15, driving the drum 14 and the small drum 5 to rotate.

[0040] As Figure 1As shown in the figure, the first gear transmission mechanism 111 includes transmission gears Z1, Z2, Z3, Z4, and Z5; the transmission gear Z1 meshes with the output shaft of the cutting motor 12. The second gear transmission mechanism 131 includes transmission gears Z7, Z8, and Z9; the transmission gear Z9 drives the large drums 14 on both sides. The third gear transmission mechanism 53 includes transmission gears Z10, Z11, Z12, and Z13; Z13 drives the small drum 5. The transmission gears Z5, Z7, and Z10 are respectively in transmission connection with the transmission connection shaft 15 provided with the transmission gear Z6. The third gear transmission mechanism 53 is arranged below the transmission connection shaft 15. When the cutting motor 12 is started, the first gear transmission mechanism 111 drives the second gear transmission mechanism 131 and the third gear transmission mechanism 53 through the transmission connection shaft 15, driving the drum 14 and the small drum 5 to rotate. By adopting this technical measure, on the premise of ensuring the stable operation of the small drum 5, the small drum 5 and the large drum 14 share a cutting motor 12, which has a simple structure and high stability. At the same time, adding a new motor is avoided, thus reducing the manufacturing cost.

[0041] As Figure 2 shown, the body of the small drum 5 is cylindrical, and a plurality of groups of first cutting teeth 511 are arranged at intervals along the axial direction, and each first cutting tooth 511 is perpendicular to the axis. Specifically, there are 9 groups of first cutting teeth 511, and each group consists of 4 to 6 first cutting teeth 511. In actual use, there is a gap between the first cutting teeth 511 and the rocker arm housing 133. By adopting this technical measure, it can prevent coal blocks from getting stuck between the first cutting teeth 511.

[0042] As Figure 2 shown, the end of the small drum 5 away from the spline is rotatably connected to the mounting seat 6 provided on the rocker arm housing 133; the mounting seat 6 is provided with a bearing 61 that cooperates with the end of the small drum 5, and the mounting seat 6 is connected to the rocker arm housing 133 by a detachable connection structure. In actual use, the mounting seat 6 and the rocker arm housing 133 are connected by bolts. By adopting this technical measure, it is convenient to disassemble and assemble, thus facilitating the replacement / disassembly of the small drum 5. It has the technical advantages of simple structure and convenient disassembly / maintenance.

[0043] Specifically, the mounting base 6 is integrally L-shaped. Its horizontal section is connected to the rocker arm housing 133 by bolts, and its vertical section is provided with a bearing 61 that mates with the end of the small drum 5. The horizontal section and the vertical section form an L-shaped angle 62. During actual use, due to the existence of the L-shaped angle 62, there is a problem that the gap between the first pick 511 and the mounting base 6 may be blocked by coal pieces. Therefore, at least one second pick 521 that is inclined toward the L-shaped angle 62 of the mounting base 6 and has a clearance fit with the L-shaped angle 62 is provided on the small drum 5. By providing the second pick 521, it is possible to prevent the gap between the first pick 511 and the mounting base 6 from being blocked by coal pieces, ensure the normal operation of the small drum 5, and thus ensure the working efficiency of coal mining.

[0044] Embodiment 2

[0045] As Figure 2 shown, the small drum 5 includes a second drum 52 provided with second picks 521 and a first drum 51 with first picks 511. The second drum 52 and the first drum 51 are detachably connected. During actual use, the cross-section of the second drum 52 is T-shaped. The second drum 52 is sleeved on one end of the first drum 51 and fixed by bolts. By adopting this technical measure, it is convenient for batch manufacturing and subsequent sectional maintenance. When replacement is required, only one of the drums 14 needs to be replaced separately.

[0046] Based on the above embodiments, the present invention also provides a shearer for steeply inclined coal seams, which includes the cutting part 1 for steeply inclined coal seams provided by the present invention, and also includes a variable-frequency speed control box 3 and a traction part 2. During actual use, since the cutting part 1 provided with the small drum 5 can clean the coal remaining under the rocker arm 13 after coal cutting, it ensures that the rocker arm 13 can smoothly cut downward during coal mining and ensures the coal mining efficiency. The shearer for steeply inclined coal seams adopting the cutting part 1 has the technical advantages of simple structure and high coal mining efficiency; at the same time, by adopting the AC variable-frequency speed regulation technology, stepless speed regulation of the traction speed is realized, the electric traction efficiency is high, the traction force is large, and it has the functions of reverse rotation and overspeed prevention.

[0047] The shearer for steeply inclined coal seams provided by the present invention is applicable to inclined longwall mining faces with a coal seam dip angle <55°, a coal seam thickness of 0.6 m, and a working face length of about 120 m. It is required that the coal quality hardness f ≤ 3, the roof is moderately stable, the floor undulation is not too large, and the coal seam does not contain hard inclusions.

[0048] The above has introduced in detail the technical solutions provided by the embodiments of the present invention. Specific examples are used herein to elaborate on the principles and implementation manners of the embodiments of the present invention. The description of the above embodiments is only applicable to helping understand the principles of the embodiments of the present invention; at the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A cutting unit for steeply inclined coal seams, characterized in that: The cutting part includes a housing provided with a cutting motor, a transmission mechanism, a rocker arm, a drum and a lower cutting depth adjustment device; the rocker arm housing of the rocker arm is hinged to the housing; two drums are symmetrically connected by a rocker arm connecting shaft on both sides of the end of the rocker arm away from the housing; a small drum is drivingly connected directly below the rocker arm and is arranged along the length direction of the rocker arm housing and has a length equivalent to that below the rocker arm housing; The transmission mechanism includes a first gear transmission mechanism arranged in the housing and cooperating with the output shaft of the cutting motor, a transmission connecting shaft provided with transmission teeth, a second gear transmission mechanism and a third gear transmission mechanism arranged in the rocker arm housing; a spline cooperating with the third gear transmission mechanism is provided at one end of the small drum; the rocker arm connecting shaft forms a transmission connection with the second gear transmission mechanism; the first gear transmission mechanism drives the second gear transmission mechanism and the third gear transmission mechanism through the transmission connecting shaft to drive the drum and the small drum to rotate; One end of the small drum away from the spline is rotatably connected to a mounting seat arranged on the rocker arm housing; the mounting seat is provided with a bearing cooperating with the end of the small drum, and the mounting seat is connected to the rocker arm housing by a detachable connection structure; The body of the small drum is cylindrical, and a plurality of groups of first cutting teeth are arranged at intervals along the axial direction, and each first cutting tooth is perpendicular to the axis; The small drum is provided with at least one second cutting tooth inclined towards the L-shaped included angle direction of the mounting seat and having a clearance fit with the L-shaped included angle; The small drum includes a second drum provided with the second cutting teeth and a first drum provided with the first cutting teeth, and the second drum and the first drum are detachably connected; 2. The cutting part for steeply inclined coal seams according to claim 1, characterized in that: A clearance is provided between the first cutting tooth and the rocker arm housing; 3. The cutting part for steeply inclined coal seams according to claim 1, characterized in that: The middle part of the end of the housing is in a concave shape, and the rocker arm is installed in the groove of the housing; 4. The cutting part for steeply inclined coal seams according to claim 1, characterized in that: The lower cutting depth adjustment device is a hydraulic cylinder device connected between the outer surface of the rocker arm housing and the outer surface of the housing; 5. A shearer for steeply inclined coal seams, characterized in that, It includes a variable frequency speed control box, a traction part and a cutting part for steeply inclined coal seams as described in any one of claims 1 to 4.

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