Thin seam coal mining system and method

Abstract

The present application provides a kind of thin coal seam coal mining system and method, belong to the technical field of thin coal seam mining, thin coal seam coal mining system includes inner rocker arm type coal winning machine, coal winning machine drive, scraper conveyor, scraper conveyor drive, goaf side support and coal conveyor;The inner rocker arm type coal winning machine includes coal winning machine body, driving device, transmission device, rocker arm, rocker arm drive part, cutting drum and sliding shoe assembly.The present application is simple in structure, reasonable in design, can reduce coal winning machine failure, improve the cutting efficiency of coal winning machine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thin coal seam mining, and specifically discloses a thin coal seam mining system and method. BACKGROUND

[0002] The reserves of thin coal seams in China account for about 18% of the total coal reserves in China. Since thin coal seams are mostly located in the marginal zones of coalfields, the occurrence conditions are complex, and geological structures such as faults, folds, undulations and parting are often present in the working face of thin coal seams. Moreover, due to the mining height being mostly below 1.5 m, the space is narrow, and the equipment for thin coal seams is required to have higher strength and a more flexible structure. Although the existing thin coal seam shearer can meet the requirements of cutting in thin coal seams in terms of height, the overall structure is relatively complex due to the influence of the design of traditional shearer, which increases the failure points of the shearer, and the machine body is relatively long, which requires wider transportation roadway and ventilation roadway, increases the tunneling cost, and the long machine body needs to be constantly adjusted to cut the triangular coal at both ends of the coal mining face, which increases the cutting time. In addition, the maintenance of the long machine body shearer in the low and narrow thin coal seam roadway is also a great challenge. SUMMARY

[0003] The present application provides a thin coal seam mining system, which is simple in structure, reasonable in design, can reduce the failure of the shearer, and improve the cutting efficiency of the shearer. The present application also provides a coal mining method based on the above system.

[0004] The thin coal seam mining system comprises an inner rocker arm type shearer, a shearer drive, a scraper conveyor, a scraper conveyor drive, a goaf side support and a coal conveying conveyor. The inner rocker arm type shearer comprises a shearer machine body, a drive device, a transmission device, a rocker arm, a rocker arm drive part, a cutting drum and a sliding shoe assembly. The shearer machine body is provided with a coal passing window along the central axis. The drive device is installed in the shearer machine body and located at the goaf side of the shearer machine body. Two groups of rocker arms are vertically rotatably installed on the shearer machine body and symmetrically arranged on both sides of the coal passing window and driven to rotate by the rocker arm drive part. The cutting drum is rotatably installed on the rocker arm and located at the coal wall side of the shearer machine body. The rotation axis of the cutting drum is parallel to and does not coincide with the rotation axis of the rocker arm. Two groups of transmission devices are symmetrically arranged on both sides of the central axis of the shearer machine body and located in the shearer machine body, the rocker arm and the cutting drum, and transmit the power provided by the drive device to the cutting drum. The sliding shoe assembly is installed at the bottom of the shearer machine body. The inner rocker arm type shearer is placed on the scraper conveyor through the sliding shoe assembly and moves horizontally relative to the scraper conveyor to cut coal under the traction of the shearer drive. The scraper conveyor is arranged in the working face cut hole and transports the coal thereon to the coal conveying conveyor under the driving action of the scraper conveyor drive. The goaf side support is arranged at the goaf side and comprises a roof supporting oil cylinder and a push-pull oil cylinder. The roof supporting oil cylinder is used to contact and support the top of the goaf side. The push-pull oil cylinder is hinged to the scraper conveyor and used to push the scraper conveyor to the coal wall side. The coal conveying conveyor is arranged in the transportation roadway.

[0005] Further, the driving device is a transversely arranged double-output motor; the transmission device comprises a torque shaft, a bevel gear I, a bevel gear II, a transmission shaft, a primary gear, a secondary gear, a secondary gear shaft, a tertiary gear, a tertiary gear shaft, a spline gear and a planetary reducer; the torque shaft is transversely arranged in the shearer body and is fixedly connected with the output shaft of the double-output motor at the first end and with the bevel gear I at the second end; the transmission shaft is vertically arranged in the shearer body and the rocker arm and is rotatably connected with the shearer body and the rocker arm respectively, is fixedly connected with the bevel gear II at the first end and with the primary gear at the second end; the bevel gear II and the bevel gear I are vertically engaged; the secondary gear shaft is fixedly installed in the rocker arm and is parallel to the transmission shaft; the secondary gear is rotatably installed on the secondary gear shaft and is engaged with the primary gear; the tertiary gear shaft is rotatably installed in the rocker arm and is parallel to the secondary gear shaft; the tertiary gear is fixedly installed on the tertiary gear shaft and is engaged with the secondary gear; the input end of the spline gear is connected with the tertiary gear shaft and the output end is connected with the input end of the planetary reducer; the planetary reducer is arranged in the rocker arm and the cutting drum and is connected with the cutting drum at the output end to drive the cutting drum to rotate.

[0006] Further, the transmission device further comprises a bearing I, a bearing II, a bearing III and a bearing IV; the torque shaft is rotatably connected with the shearer body through the bearing I; the bearing II is installed in the shearer body to support the bevel gear II; the inner ring of the bearing III is fixedly connected with the transmission shaft and the outer ring is fixedly connected with the rocker arm; the tertiary gear shaft is rotatably connected with the rocker arm through the bearing IV.

[0007] Further, the two bearings III are located at the two sides of the primary gear respectively and are bearing IIIa and bearing IIIb; the outer side of the bearing IIIa is provided with a rotating sealing cover; the outer side of the bearing IIIb is provided with a bearing end cover; the two bearings III are single-row roller bearings.

[0008] Further, the secondary gear is an idler gear and is rotatably installed on the secondary gear shaft through a bearing V; the planetary reducer is a secondary planetary reducer.

[0009] Further, the rocker arm is connected with the shearer body through a rotating sleeve; the inner wall of the rotating sleeve is fixed on the shearer body and the outer wall is rotatably connected with the rocker arm; the rocker arm driving part is a rocker arm oil cylinder and the two ends are connected with the shearer body and the rocker arm through oil cylinder ear seats respectively.

[0010] Further, the cutting drum comprises a cylindrical structure, an arc-shaped end face and cutting teeth; the planetary reducer passes through the first end of the cylindrical structure and the output end is fixedly connected with the cylindrical structure; the arc-shaped end face is arranged at the second end of the cylindrical structure and protrudes outward; the cutting teeth are distributed outside the cylindrical structure and the arc-shaped end face.

[0011] The present application provides a thin coal seam mining method, comprising the following steps:

[0012] S1, arranging the thin coal seam mining system;

[0013] S2, oblique cutting coal

[0014] t1, moving the inner rocker arm type coal mining machine to the transportation roadway or the ventilation roadway by the coal mining machine drive, a single cutting drum faces the coal wall side, the inner rocker arm type coal mining machine is powered on, the power of the double output motor is transmitted to the left and right two cutting drums through the transmission device thereof, the left and right cutting drums obtain driving force with opposite rotation directions and same rotation speeds;

[0015] t2, the push-pull oil cylinder pushes the scraper conveyor to the coal wall side, the advancing amount of the cutting drum facing the coal wall side in step t1 is greater than that of the cutting drum facing the roadway, so that the cutting drum of the inner rocker arm type coal mining machine is obliquely cut into the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine moves horizontally relative to the scraper conveyor under the traction of the coal mining machine drive, so as to realize the oblique cutting coal of the inner rocker arm type coal mining machine;

[0016] t3, the cutting position of the inner rocker arm type coal mining machine is continuously adjusted by the support located on the goaf side of the advancing direction of the inner rocker arm type coal mining machine during the cutting process, finally the machine body is parallel to the coal wall side, the goaf side support cooperates with the scraper conveyor and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine, the coal cut by the inner rocker arm type coal mining machine enters the scraper conveyor through the coal passing window and is transferred to the coal conveying conveyor by the scraper conveyor, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted through the rocker arm and the rocker arm drive part, so as to realize the cutting height adjustment.

[0017] The present application provides a thin coal seam mining method, comprising the following steps:

[0018] S1, arranging the thin coal seam mining system;

[0019] S2, single vertical cutting coal

[0020] t1, moving the inner rocker arm type coal mining machine to the transportation roadway or the ventilation roadway by the coal mining machine drive, a single cutting drum faces the coal wall side, the inner rocker arm type coal mining machine is powered on, the power of the double output motor is transmitted to the left and right two cutting drums through the transmission device thereof, the left and right cutting drums obtain driving force with opposite rotation directions and same rotation speeds;

[0021] t2, the push-pull oil cylinder pushes the scraper conveyor to the coal wall side, the advancing amount of the cutting drum facing the coal wall side in step t1 is greater than that of the cutting drum facing the roadway, so that the cutting drum of the inner rocker arm type coal mining machine is obliquely cut into the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine moves horizontally relative to the scraper conveyor under the traction of the coal mining machine drive, so as to realize the oblique cutting coal of the inner rocker arm type coal mining machine;

[0022] t3, during the cutting process, the cutting pose of the inner rocker arm type coal mining machine is constantly adjusted by the goaf side support located in the advancing direction of the inner rocker arm type coal mining machine, finally realizing that the machine body is parallel to the coal wall side, the goaf side support cooperates with the push of the scraper conveyor and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine, the coal cut by the inner rocker arm type coal mining machine enters the scraper conveyor through the coal passing window and is transferred to the coal conveying conveyor by the scraper conveyor, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted through the rocker arm and the rocker arm driving part, so that the cutting height adjustment is realized.

[0023] The present application provides a thin coal seam mining method, which is used for cutting coal seams with a hardness coefficient f≤6 in the whole process or cutting coal seams with f=10 in a short distance (within 50m), and comprises the following steps:

[0024] S1, arranging the above-mentioned thin coal seam mining system;

[0025] S2, double-end vertical tool-approaching coal cutting

[0026] t1, moving the inner rocker arm type coal mining machine to the transportation roadway or the ventilation roadway through the coal mining machine driving, both cutting drums face the coal wall side, the inner rocker arm type coal mining machine is powered on, the power of the double-output motor is transmitted to the left and right two cutting drums through the transmission device thereof, and the left and right cutting drums obtain driving power with opposite directions and same speeds;

[0027] t2, the push-pull oil cylinder pushes the scraper conveyor to the coal wall side, the advancing amount of the two cutting drums is the same, the cutting drum of the inner rocker arm type coal mining machine vertically enters the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine moves horizontally relative to the scraper conveyor under the traction of the coal mining machine driving, so that the vertical tool-approaching coal cutting of the inner rocker arm type coal mining machine is realized;

[0028] t3, during the cutting process, the cutting pose of the inner rocker arm type coal mining machine is constantly adjusted by the goaf side support located in the advancing direction of the inner rocker arm type coal mining machine, finally realizing that the machine body is parallel to the coal wall side, the goaf side support cooperates with the push of the scraper conveyor and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine, the coal cut by the inner rocker arm type coal mining machine enters the scraper conveyor through the coal passing window and is transferred to the coal conveying conveyor by the scraper conveyor, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted through the rocker arm and the rocker arm driving part, so that the cutting height adjustment is realized.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1. The horizontally placed double output motor is the core component of the inner rocker arm type coal mining machine, and forms a concave arrangement with the two side transmission devices, greatly reducing the center distance between the two cutting drums (the center distance between the two cutting drums of the existing rocker arm type coal mining machine can be as small as 2185mm, while the center distance of the above-mentioned inner rocker arm type coal mining machine is about 1.7m, and the minimum required roadway is 4.5m), so that the inner rocker arm type coal mining machine can realize inner rocker arm swinging, the whole coal mining machine structure is simple, and the failure points are reduced;

[0031] 2. The above-mentioned coal mining machine can adjust the height of the cutting drum through the rocker arm, and expand the mining height range of the thin seam coal mining machine;

[0032] 3. Since the above-mentioned coal mining machine body is short, various coal cutting methods can be realized, the cutting method is rich, and the adaptability is strong;

[0033] 4. The end of the cutting drum is designed in an arc shape, so that it can realize vertical tool feeding at both ends of the coal mining face;

[0034] 5. When cutting in the thin seam working face, the above-mentioned coal mining machine can be pulled to the two side transport roadways or ventilation roadways for maintenance, so that the maintenance is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1 It is a schematic view of the inner rocker arm type coal mining machine cutting into the coal wall side from the transport roadway;

[0037] Figure 2 It is a schematic view of the inner rocker arm type coal mining machine cutting coal obliquely while moving to the ventilation roadway;

[0038] Figure 3 It is a schematic view of the inner rocker arm type coal mining machine vertically entering the coal wall side from the transport roadway;

[0039] Figure 4 It is a schematic view of the inner rocker arm type coal mining machine moving to the ventilation roadway;

[0040] Figure 5 It is a schematic view of the inner rocker arm type coal mining machine moving to the ventilation roadway;

[0041] Figure 6 It is a schematic view of the inner rocker arm type coal mining machine vertically entering the coal wall side from the transport roadway;

[0042] Figure 7 Fig. 4 is a schematic diagram of the inner rocker arm type coal mining machine vertically entering the coal wall side from the transportation roadway double head;

[0043] Figure 8 Fig. 5 is a schematic diagram of the inner rocker arm type coal mining machine in the transportation roadway or ventilation roadway for maintenance;

[0044] Figure 9 Fig. 6 is a front view of the inner rocker arm type coal mining machine (rocker arm oil cylinder not in action);

[0045] Figure 10 Fig. 7 is a front view of the inner rocker arm type coal mining machine (rocker arm oil cylinder in action);

[0046] Figure 11 Fig. 8 is a top view of the inner rocker arm type coal mining machine.

[0047] Fig. 1: 1-inner rocker arm type coal mining machine; 1.1-coal mining machine body; 1.1.1-coal passing window; 1.2-double output motor; 1.3.1-torque shaft; 1.3.2-bevel gear I; 1.3.3-bearing I; 1.3.4-bevel gear II; 1.3.5-bearing II; 1.3.6-transmission shaft; 1.3.7-rotary seal cover; 1.3.81-bearing IIIa; 1.3.82-bearing IIIb; 1.3.9-bearing end cover; 1.3.10-primary gear; 1.3.11-secondary gear; 1.3.12-secondary gear shaft;

[0048] 1.3.13-tertiary gear and gear shaft; 1.3.14-bearing IV; 1.3.15-spline gear; 1.3.16-secondary planetary reducer; 1.4.1-rocker arm; 1.4.2-rotary sleeve; 1.5-rocker arm oil cylinder; 1.6.1-cylinder structure; 1.6.2-arc-shaped end face; 1.6.3-cutter; 1.7.1-left front sliding shoe assembly; 1.7.2-left rear sliding shoe assembly; 1.7.3-right front sliding shoe assembly; 1.7.4-right rear sliding shoe assembly;

[0049] 2-coal mining machine drive; 3-scraping conveyor; 4-scraping conveyor drive; 5-coal emptying side support; 5.1-roof support oil cylinder; 5.2-pushing and pulling oil cylinder; 6-coal transportation conveyor. DETAILED DESCRIPTION

[0050] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0051] Example 1

[0052] The embodiment provides a thin coal seam mining system, which comprises an inner rocker arm type coal mining machine 1, a coal mining machine drive 2, a scraper conveyor 3, a scraper conveyor drive 4, a goaf side support 5 and a coal conveying machine 6.

[0053] The inner rocker arm type coal mining machine 1 comprises a coal mining machine body 1.1, a drive device, a transmission device, a rocker arm 1.4.1, a rocker arm drive part, a cutting drum and a support shoe assembly.

[0054] The coal mining machine body 1.1 is the body of the whole coal mining machine, and a coal passing window 1.1.1 is arranged along a central axis, and the coal cut by the cutting drum enters the scraper conveyor through the coal passing window 1.1.1.

[0055] The drive device is installed in the coal mining machine body 1.1 and located at the goaf side (A side) of the coal mining machine body 1.1, and the drive device is a transversely arranged double-output motor 1.2 which can output the same rotating speed and opposite rotating directions of torque to both ends.

[0056] Two groups of rocker arms 1.4.1 are vertically rotatably installed on the coal mining machine body 1.1 and symmetrically arranged at both sides of the coal passing window 1.1.1, and specifically, the rocker arm 1.4.1 is connected with the coal mining machine body 1.1 through a rotating sleeve 1.4.2; the inner wall of the rotating sleeve 1.4.2 is fixed on the coal mining machine body 1, and the outer wall is rotatably connected with the rocker arm 1.4.1.

[0057] The rocker arm 1.4.1 is driven to rotate by the rocker arm drive part; the rocker arm drive part is a rocker arm oil cylinder 1.5, and both ends are connected with the coal mining machine body 1.1 and the rocker arm 1.4.1 through oil cylinder ear seats respectively.

[0058] The cutting drum is rotatably installed on the rocker arm 1.4.1 and located at the coal wall side (B side) of the coal mining machine body 1.1, the rotating shaft of the cutting drum is parallel to and does not coincide with the rotating shaft of the rocker arm 1.4.1, and the rocker arm oil cylinder 1.5 is telescopic, so as to drive the rocker arm 1.4.1 and the cutting drum thereon to rotate around the rotating shaft of the rocker arm 1.4.1, thereby adjusting the height of the cutting drum. The cutting drum comprises a cylindrical structure 1.6.1, an arc-shaped end face 1.6.2 and a cutting pick 1.6.3; the arc-shaped end face 1.6.2 is arranged at the second end of the cylindrical structure 1.6.1 and protrudes outward, which is more conducive to vertical tooling; the cutting pick 1.6.3 is distributed outside the cylindrical structure 1.6.1 and the arc-shaped end face 1.6.2 according to a spiral line.

[0059] Two groups of transmission devices are symmetrically arranged at both sides of the central axis of the coal mining machine body 1.1 and located in the coal mining machine body 1.1, the rocker arm 1.4.1 and the cutting drum, and power provided by the drive device is transmitted to the cutting drum.

[0060] The two sets of transmission devices have the same structure and are symmetrically arranged, and each includes a torque shaft 1.3.1, a bevel gear I 1.3.2, a bearing I 1.3.3, a bevel gear II 1.3.4, a bearing II 1.3.5, a transmission shaft 1.3.6, a rotary sealing cover 1.3.7, a bearing III, a bearing end cover 1.3.9, a primary gear 1.3.10, a secondary gear 1.3.11, a secondary gear shaft 1.3.12, a tertiary gear, a tertiary gear shaft, a bearing IV 1.3.14, a spline gear 1.3.15, and a planetary reducer; the torque shaft 1.3.1 is transversely and rotatably arranged in the shearer body 1.1 through the bearing I 1.3.3, the outer spline at the first end is connected with the inner spline of the output shaft of the double-output motor 1.2, and the outer spline at the second end is connected with the inner spline of the bevel gear I 1.3.2; the transmission shaft 1.3.6 is vertically arranged in the shearer body 1.1 and the rocker arm 1.4.1 and is rotatably connected with the shearer body 1.1 and the rocker arm 1.4.1 respectively, the outer spline at the first end is connected with the inner spline of the bevel gear II 1.3.4, and the outer spline at the second end is connected with the inner spline of the primary gear 1.3.10; the bevel gear II 1.3.4 and the bevel gear I 1.3.2 are vertically engaged, the bevel gear II 1.3.4 is rotatably supported by the bearing II 1.3.5 arranged in the shearer body 1.1, and the transmission direction after the bevel gear II 1.3.4 is changed to the direction towards the coal wall side; the primary gear 1.3.10 is provided with a bearing IIIa 1.3.81 and a bearing IIIb 1.3.82 on both sides to connect the rocker arm 1.4.1; the outer side of the bearing IIIa 1.3.81 is provided with the rotary sealing cover 1.3.7 to limit the axial position, and the rotary sealing cover 1.3.7 ensures that the rocker arm 1.4.1 does not leak oil when rotating relative to the shearer body 1.1; the outer side of the bearing IIIb 1.3.82 is provided with the bearing end cover 1.3.9 to limit the axial position; the secondary gear shaft 1.3.12 is fixedly arranged in the rocker arm 1.4.1 and is parallel to the transmission shaft 1.3.6; the secondary gear 1.3.11 is an idler gear and is rotatably arranged on the secondary gear shaft 1.3.12 through a bearing V and is engaged with the primary gear 1.3.10; the tertiary gear shaft is rotatably arranged in the rocker arm 1.4.1 through a bearing IV 1.3.14 and is parallel to the secondary gear shaft 1.3.12; the tertiary gear is fixedly arranged on the tertiary gear shaft and is engaged with the secondary gear 1.3.11; the input end of the spline gear 1.3.15 is connected with the tertiary gear shaft, and the output end is connected with the input end of the planetary reducer; the planetary reducer is arranged in the rocker arm 1.4.1 and the cutting drum, the output end is connected with the cylindrical structure 1.6.1, and the planetary reducer drives the cutting drum to rotate.

[0061] Both the bearings III are single-row roller bearings.

[0062] The planetary reducer is a two-stage planetary reducer 1.3.16, which plays a role of speed reduction and torque increase, and the outer shell is fixedly connected with the rocker arm 1.4.1.

[0063] The working process of the transmission device is described as follows:

[0064] The double-output motor 1.2 can output torque in opposite directions with the same speed to two ends. The transmission of the output torque of the double-output motor 1.2 to the coal wall side direction is realized through the torque shaft 1.3.1, the bevel gear I 1.3.2 and the bevel gear II 1.3.4. The transmission of the output torque to the inside (the center direction of the double-output motor 1.2) is realized through the first-stage gear 1.3.10, the second-stage gear 1.3.11 and the third-stage gear. The transmission of the output torque to the coal wall side is realized through the spline gear 1.3.15 and the planetary reducer.

[0065] When the rocker arm 1.4.1 rotates, the first-stage gear 1.3.10 does not rotate, the second-stage gear 1.3.11 rotates around the first-stage gear 1.3.10, the inner ring of the bearing III is stationary, and the outer ring rotates around the transmission shaft 1.3.6 with the rocker arm 1.4.1. When the rocker arm 1.4.1 does not rotate, the outer ring of the bearing III is stationary, and the inner ring rotates with the transmission shaft 1.3.6.

[0066] The bottom of the shearer body 1.1 is further provided with slide shoe assemblies, including a left front slide shoe assembly 1.7.1, a left rear slide shoe assembly 1.7.2, a right front slide shoe assembly 1.7.3 and a right rear slide shoe assembly 1.7.4. The slide shoe assemblies support the shearer and enable the shearer to move relative to the scraper conveyor.

[0067] The arrangement of the transversely arranged double-output motor 1.2 and the transmission device makes it possible to reduce the length of the shearer, and the minimum center distance of the cutting drum is about 1.7 m, which makes it possible to realize the inner rocker shearer and breaks through the traditional outer rocker shearer.

[0068] The inner rocker shearer 1 is placed on the scraper conveyor 3 by the slide shoe assemblies and moves horizontally relative to the scraper conveyor 3 under the traction of the shearer drive 2 to cut coal; the shearer drive 2 is arranged in the ventilation roadway.

[0069] The scraper conveyor 3 is arranged in the working face cut hole and is driven by the scraper conveyor drive 4 to transport the coal thereon to the coal transportation conveyor 6; the scraper conveyor drive 4 is arranged in the transportation roadway.

[0070] The goaf side support 5 is arranged on the goaf side and includes a roof supporting oil cylinder 5.1 and a push-pull oil cylinder 5.2. The roof supporting oil cylinder 5.1 is used to contact and support the top of the goaf side. The push-pull oil cylinder 5.2 is hinged to the scraper conveyor 3 and is used to push the scraper conveyor 3 to the coal wall side.

[0071] The coal transportation conveyor 6 is arranged in the transportation roadway and is used to transport the coal cut by the inner rocker shearer 1 to the outside of the roadway.

[0072] The transportation roadway, the ventilation roadway and the scraper conveyor 3 are enclosed on the coal wall side, and the cutting drum of the inner rocker arm type coal mining machine 1 faces the coal wall side.

[0073] Embodiment 2

[0074] The embodiment provides a thin seam coal mining method, which comprises the following steps.

[0075] S1, arranging the thin seam coal mining system in embodiment 1.

[0076] S2, oblique cutting coal mining

[0077] t1, moving the inner rocker arm type coal mining machine 1 to the transportation roadway or the ventilation roadway by the coal mining machine drive 2, the single cutting drum faces the coal wall side, the inner rocker arm type coal mining machine 1 is powered on, the power of the double-output motor 1.2 is transmitted to the left and right cutting drums through the transmission device, and the left and right cutting drums obtain driving forces with opposite directions and the same rotating speeds;

[0078] t2, pushing the scraper conveyor 3 to the coal wall side by the push-pull oil cylinder 5.2, the pushing amount of the cutting drum facing the coal wall side in step t1 is greater than that of the cutting drum facing the roadway, so that the cutting drum of the inner rocker arm type coal mining machine 1 is obliquely cut into the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine 1 moves horizontally relative to the scraper conveyor 3 under the traction of the coal mining machine drive 2, so that the oblique cutting coal mining of the inner rocker arm type coal mining machine 1 is realized;

[0079] t3, the cutting position of the inner rocker arm type coal mining machine 1 is continuously adjusted by the goaf side support 5 located in the advancing direction of the inner rocker arm type coal mining machine 1 during the cutting process, finally the machine body 1.1 is parallel to the coal wall side, the goaf side support 5 cooperates with the scraper conveyor 3 and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine 1, the coal cut by the inner rocker arm type coal mining machine 1 enters the scraper conveyor 3 through the coal passing window 1.1.1 and is transferred to the coal conveying conveyor 6 by the scraper conveyor 3, when it is necessary to adjust the cutting height, the heights of the left and right cutting drums are adjusted by the rocker arm 1.4.1 and the rocker arm drive part, so that the cutting height adjustment is realized.

[0080] Embodiment 3

[0081] The embodiment provides a thin seam coal mining method, which comprises the following steps.

[0082] S1, arranging the thin seam coal mining system in embodiment 1.

[0083] S2, single-head vertical cutting coal mining

[0084] t1, the inner rocker arm type coal cutter 1 is moved to the transportation roadway or the ventilation roadway by the coal cutter drive 2, the single cutting drum faces the coal wall side, the inner rocker arm type coal cutter 1 is powered on, the power of the double output motor 1.2 is transmitted to the left and right cutting drums through the transmission device, and the left and right cutting drums obtain driving forces with opposite directions and the same speed;

[0085] t2, the push-pull oil cylinder 5.2 pushes the scraper conveyor 3 to the coal wall side, the pushing amounts of the two cutting drums are the same, the cutting drum of the inner rocker arm type coal cutter 1 vertically enters the coal wall side, after entering the preset depth, the inner rocker arm type coal cutter 1 moves horizontally relative to the scraper conveyor 3 under the traction of the coal cutter drive 2, so that the vertical cutting coal of the inner rocker arm type coal cutter 1 is realized;

[0086] t3, the cutting position of the inner rocker arm type coal cutter 1 is continuously adjusted by the support 5 located on the goaf side of the advancing direction of the inner rocker arm type coal cutter 1 during the cutting process, finally the machine body 1.1 is parallel to the coal wall side, the support 5 on the goaf side pushes the scraper conveyor 3 and supports the goaf according to different cutting positions of the inner rocker arm type coal cutter 1, the coal cut by the inner rocker arm type coal cutter 1 enters the scraper conveyor 3 through the coal passing window 1.1.1 and is transferred to the coal conveying conveyor 6 by the scraper conveyor 3, when the cutting height needs to be adjusted, the height of the left and right cutting drums is adjusted through the rocker arm 1.4.1 and the rocker arm drive part, so that the cutting height adjustment is realized.

[0087] Embodiment 4

[0088] The embodiment provides a thin coal seam coal mining method, which is used for cutting coal seams with a hardness coefficient f≤6 in the whole process or cutting coal seams with f=10 in a short distance (within 50 m), and comprises the following steps.

[0089] S1, the thin coal seam coal mining system in embodiment 1 is arranged.

[0090] S2, double-end vertical cutting coal

[0091] t1, the inner rocker arm type coal cutter 1 is moved to the transportation roadway or the ventilation roadway by the coal cutter drive 2, the two cutting drums face the coal wall side, the inner rocker arm type coal cutter 1 is powered on, the power of the double output motor 1.2 is transmitted to the left and right cutting drums through the transmission device, and the left and right cutting drums obtain driving forces with opposite directions and the same speed;

[0092] t2, the push-pull oil cylinder 5.2 pushes the scraper conveyor 3 to the coal wall side, the pushing amounts of the two cutting drums are the same, the cutting drum of the inner rocker arm type coal cutter 1 vertically enters the coal wall side, after entering the preset depth, the inner rocker arm type coal cutter 1 moves horizontally relative to the scraper conveyor 3 under the traction of the coal cutter drive 2, so that the vertical cutting coal of the inner rocker arm type coal cutter 1 is realized;

[0093] t3, continuously adjusting the cutting pose of the inner rocker arm type coal mining machine 1 by the goaf side support 2 located in the advancing direction of the inner rocker arm type coal mining machine 1 during the cutting process, finally realizing that the coal mining machine body 1.1 is parallel to the coal wall side, the goaf side support 5 cooperates with the pusher conveyor 3 and supports the goaf side according to different cutting positions of the inner rocker arm type coal mining machine 1, the coal cut by the inner rocker arm type coal mining machine 1 enters the pusher conveyor 3 through the coal window 1.1.1 and is transported to the coal conveying conveyor 6 by the pusher conveyor 3, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted by the rocker arm 1.4.1 and the rocker arm driving part, so as to realize the adjustment of the cutting height.

[0094] Embodiment 5

[0095] Another difficulty of the thin seam fully mechanized mining face is maintenance, the low working face increases the maintenance difficulty of the staff, if the traditional coal mining machine fails, the staff has to crawl in the roadway for maintenance, the inner rocker arm type coal mining machine 1 can be completely pulled into the transportation / ventilation roadway for maintenance due to the short body, the center distance between the two cutting drums of the inner rocker arm type coal mining machine 1 is about 1.7m, and the required roadway width is at least 4.5m, so the inner rocker arm type coal mining machine 1 can be completely pulled into the transportation / ventilation roadway for maintenance.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thin seam coal mining system characterized by, The inner rocker arm type coal mining machine, coal mining machine drive, scraper conveyor, scraper conveyor drive, goaf side support and coal conveying conveyor are included. The inner rocker arm type coal mining machine includes a coal mining machine body, a drive device, a transmission device, a rocker arm, a rocker arm drive part, a cutting drum and a sliding shoe assembly. The coal mining machine body is provided with a coal passing window along a central axis. The drive device is a double-output motor arranged transversely, which is installed in the coal mining machine body and located at the goaf side of the coal mining machine body. Two groups of rocker arms are vertically rotatably installed on the coal mining machine body and symmetrically arranged at two sides of the coal passing window, and are driven to rotate by the rocker arm drive part. The cutting drum is rotatably installed on the rocker arm and located at the coal wall side of the coal mining machine body, and the rotation axis of the cutting drum is parallel to and does not coincide with the rotation axis of the rocker arm. Two groups of transmission devices are symmetrically arranged at two sides of the central axis of the coal mining machine body and located in the coal mining machine body, the rocker arm and the cutting drum, and transmit power provided by the drive device to the cutting drum. The sliding shoe assembly is installed at the bottom of the coal mining machine body. The inner rocker arm type coal mining machine is placed on the scraper conveyor through the sliding shoe assembly, and moves horizontally relative to the scraper conveyor to cut coal under the traction of the coal mining machine drive. The scraper conveyor is arranged in the working face cut hole, and transports the coal thereon to the coal conveying conveyor under the driving action of the scraper conveyor drive. The goaf side support is arranged at the goaf side, and includes a roof supporting oil cylinder and a push-pull oil cylinder. The roof supporting oil cylinder is used to contact and support the top of the goaf side. The push-pull oil cylinder is hinged to the scraper conveyor and is used to push the scraper conveyor to the coal wall side. The coal conveying conveyor is arranged in the transportation roadway.

2. Thin seam coal mining system according to claim 1, characterized in that, The transmission device includes a torque shaft, a bevel gear I, a bevel gear II, a transmission shaft, a primary gear, a secondary gear, a secondary gear shaft, a tertiary gear, a tertiary gear shaft, a spline gear and a planetary reducer. The torque shaft is transversely rotatably arranged in the coal mining machine body, and a first end is fixedly connected with an output shaft of the double-output motor, and a second end is fixedly connected with the bevel gear I. The transmission shaft is vertically arranged in the coal mining machine body and the rocker arm, and is rotatably connected with the coal mining machine body and the rocker arm respectively, a first end is fixedly connected with the bevel gear II, and a second end is fixedly connected with the primary gear. The bevel gear II and the bevel gear I are vertically engaged. The secondary gear shaft is fixedly installed in the rocker arm and parallel to the transmission shaft. The secondary gear is rotatably installed on the secondary gear shaft and engaged with the primary gear. The tertiary gear shaft is rotatably installed in the rocker arm and parallel to the secondary gear shaft. The tertiary gear is fixedly installed on the tertiary gear shaft and engaged with the secondary gear. The input end of the spline gear is connected with the tertiary gear shaft, and the output end is connected with the input end of the planetary reducer. The planetary reducer is arranged in the rocker arm and the cutting drum, the output end is connected with the cutting drum, and the cutting drum is driven to rotate.

3. Thin-seam coal mining system according to claim 2, characterized in that The transmission device further includes a bearing I, a bearing II, a bearing III and a bearing IV. The torque shaft is rotatably connected with the coal mining machine body through the bearing I. The bearing II is installed in the coal mining machine body and supports the bevel gear II. The inner ring of the bearing III is fixedly connected with the transmission shaft, and the outer ring is fixedly connected with the rocker arm. The tertiary gear shaft is rotatably connected with the rocker arm through the bearing IV.

4. Thin-seam coal mining system according to claim 3, characterized in that, Two bearings III are respectively located at two sides of the primary gear, and are respectively bearing IIIa and bearing IIIb; The outer side of the bearing IIIa is provided with a rotating sealing cover; The outer side of the bearing IIIb is provided with a bearing end cover; The two bearings III are both single row roller bearings.

5. Thin seam coal mining system according to any of claims 2-4, characterized in that, The secondary gear is an idler gear, and is rotatably installed on the secondary gear shaft through the bearing V; The planetary reducer is a two-stage planetary reducer.

6. Thin seam coal mining system according to any of claims 1-4, characterized in that, The rocker arm and the shearer body are connected through a rotating sleeve; The inner wall of the rotating sleeve is fixed on the shearer body, and the outer wall is rotatably connected with the rocker arm; The rocker arm driving part is a rocker arm oil cylinder, and the two ends are respectively connected with the shearer body and the rocker arm through oil cylinder ear seats.

7. Thin-seam coal mining system according to any one of claims 2-4, characterized in that, The cutting drum comprises a cylindrical structure, an arc-shaped end face and cutting teeth; The planetary reducer passes through the first end of the cylindrical structure, and the output end is fixedly connected with the cylindrical structure; The arc-shaped end face is arranged at the second end of the cylindrical structure and protrudes outward; The cutting teeth are distributed outside the cylindrical structure and the arc-shaped end face.

8. A thin seam coal mining method characterized by, The steps include: S1, arranging the thin seam coal mining system according to any one of claims 2-7; S2, oblique cutting coal t1, moving the inner rocker arm type shearer to a transportation roadway or a ventilation roadway through a shearer drive, with a single cutting drum facing the coal wall side, the inner rocker arm type shearer being powered, and the power of the double output motors being transmitted to the left and right cutting drums through the transmission device of the inner rocker arm type shearer, so that the left and right cutting drums obtain driving forces with opposite directions and same speeds; t2, pushing the scraper conveyor to the coal wall side through the push-pull oil cylinder, the advancing amount of the cutting drum facing the coal wall side in step t1 being greater than that of the cutting drum facing the roadway, so that the cutting drum of the inner rocker arm type shearer obliquely cuts into the coal wall side, and after entering a preset depth, the inner rocker arm type shearer moves horizontally relative to the scraper conveyor under the traction of the shearer drive, thereby realizing oblique cutting coal of the inner rocker arm type shearer; t3, during the cutting process, the cutting position of the inner rocker arm type shearer is constantly adjusted by the support located on the goaf side in the advancing direction of the inner rocker arm type shearer, so that the shearer body finally becomes parallel to the coal wall side, the support on the goaf side cooperates with the scraper conveyor and supports the goaf side according to different cutting positions of the inner rocker arm type shearer, the coal cut by the inner rocker arm type shearer enters the scraper conveyor through the coal passing window and is transferred to the coal conveying conveyor by the scraper conveyor, and when it is necessary to adjust the cutting height, the height of the left and right cutting drums is adjusted through the rocker arm and the rocker arm driving part, thereby realizing cutting height adjustment.

9. A thin seam coal mining method characterized by, The steps include: S1, arranging the thin seam coal mining system according to any one of claims 2-7; S2, single head vertical cutting coal t1, moving the inner rocker arm type shearer to a transportation roadway or a ventilation roadway through a shearer drive, with a single cutting drum facing the coal wall side, the inner rocker arm type shearer being powered, and the power of the double output motors being transmitted to the left and right cutting drums through the transmission device of the inner rocker arm type shearer, so that the left and right cutting drums obtain driving forces with opposite directions and same speeds; t2, the push-pull cylinder pushes the scraper conveyor to the coal wall side, the two cutting drums have the same advancing amount, the cutting drum of the inner rocker arm type coal mining machine vertically enters the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine moves horizontally relative to the scraper conveyor under the traction of the coal mining machine drive, thereby realizing vertical cutting coal mining of the inner rocker arm type coal mining machine; t3, during the cutting process, the support on the goaf side in the advancing direction of the inner rocker arm type coal mining machine continuously adjusts the cutting pose of the inner rocker arm type coal mining machine, finally realizes that the machine body is parallel to the coal wall side, the support on the goaf side pushes the scraper conveyor and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine, the coal cut by the inner rocker arm type coal mining machine enters the scraper conveyor through the coal window and is transferred to the coal conveying conveyor by the scraper conveyor, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted through the rocker arm and the rocker arm drive part, thereby realizing cutting height adjustment.

10. A thin seam coal mining method, characterized by, The thin coal seam mining system is used for cutting coal seams with a hardness coefficient f≤6 or cutting coal seams with f=10 for a short distance, and includes the following steps: S1, arranging the thin coal seam mining system according to any one of claims 2-7; S2, double-end vertical cutting coal mining t1, moving the inner rocker arm type coal mining machine to the transportation roadway or the ventilation roadway through the coal mining machine drive, both cutting drums face the coal wall side, the inner rocker arm type coal mining machine is powered on, and the power of the double-output motor is transmitted to the left and right cutting drums through the transmission device, so that the left and right cutting drums obtain driving power with opposite directions and the same speed; t2, the push-pull cylinder pushes the scraper conveyor to the coal wall side, the two cutting drums have the same advancing amount, the cutting drum of the inner rocker arm type coal mining machine vertically enters the coal wall side, after entering the preset depth, the inner rocker arm type coal mining machine moves horizontally relative to the scraper conveyor under the traction of the coal mining machine drive, thereby realizing vertical cutting coal mining of the inner rocker arm type coal mining machine; t3, during the cutting process, the support on the goaf side in the advancing direction of the inner rocker arm type coal mining machine continuously adjusts the cutting pose of the inner rocker arm type coal mining machine, finally realizes that the machine body is parallel to the coal wall side, the support on the goaf side pushes the scraper conveyor and supports the goaf side according to different coal cutting positions of the inner rocker arm type coal mining machine, the coal cut by the inner rocker arm type coal mining machine enters the scraper conveyor through the coal window and is transferred to the coal conveying conveyor by the scraper conveyor, when it is necessary to adjust the cutting height, the height of the left and right two cutting drums is adjusted through the rocker arm and the rocker arm drive part, thereby realizing cutting height adjustment.

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