Top coal caving mesh breaking end support and mesh breaking method

Abstract

The present invention discloses a mesh breaking end bracket and mesh breaking method for top coal caving, comprising a plurality of bracket units and at least one mesh breaking device, wherein the plurality of bracket units are sequentially connected along the direction from front to back, the bracket unit at the rear end comprises a shielding beam, the mesh breaking device comprises a fixing device, a rotating device, a rotating drive, a tool device and a telescopic drive, the fixing device is embedded in the shielding beam and is provided with a recess; the rotating device is rotatably assembled in the recess, the rotating drive is connected between the fixing device and the rotating device; the tool device is rotatably assembled in the rotating device and comprises an executing tool, and the telescopic drive is connected between the tool device and the rotating device. The mesh breaking end bracket of the present invention can realize the cutting of the top plate anchor net, thereby avoiding the situation that the top plate of the goaf area is difficult to collapse in time due to the anchor net support, improving the top coal recovery rate of the end triangle area, and also improving the manifestation of the mine pressure on the working face, thereby improving the safety of the recovery operation.

Description

Technical Field

[0001] The invention relates to the technical field of mining equipment, and in particular to a top coal caving mesh breaking end support and a mesh breaking method. Background Art

[0002] At present, with the development of fully-mechanized top-coal caving technology, the ultra-large mining height fully-mechanized top-coal caving mining process is constantly being updated and improved. Since the greater the mining height (the smaller the corresponding coal caving thickness), the higher the resource recovery rate, ultra-large mining height top-coal caving equipment is gradually being promoted in the main coal producing areas in the west, changing the previous "mine one and caving three" mining situation of top-coal caving in extra-thick coal seams of 10~18m, and greatly reducing the waste of resources caused by low coal cutting height and large coal caving height in the fully-mechanized top-coal caving working face.

[0003] However, with the increase in the mining height of the fully mechanized caving working face, there is also a contradiction between tunnel support and timely unloading. That is, on the one hand, the mining process of the top coal caving working face requires softer coal seams, which requires a tunnel anchor net support method with higher support quality. On the other hand, with the advancement of the working face and the forward movement of the end hydraulic support, the roof of the tunnel goaf is difficult to collapse in time due to the use of anchor net support. This affects the top coal recovery of the end "triangle area", and also aggravates the mine pressure of the working face, which is not conducive to safe operation. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes an end bracket for top coal caving and mesh breaking, which can realize the cutting of the roof anchor mesh, thereby avoiding the situation where the roof of the goaf is difficult to collapse in time due to the support of the anchor mesh, improving the top coal recovery rate in the end triangle area, and also improving the manifestation of mine pressure on the working face, thereby improving the safety of the mining operation.

[0006] The embodiment of the present invention further proposes a mesh breaking method based on the above-mentioned top coal caving mesh breaking end head bracket.

[0007] The top coal caving and mesh breaking end head support of the embodiment of the present invention comprises:

[0008] A plurality of bracket units and at least one net breaking device, wherein the plurality of bracket units are sequentially connected in a direction from front to back, the rearmost bracket unit comprises a shielding beam, and the net breaking device comprises:

[0009] A fixing device, the fixing device is embedded in the shield beam and is provided with a recess;

[0010] A rotary device and a rotary drive, wherein the rotary device is rotatably mounted in the recess, and the rotary drive is connected between the fixing device and the rotary device and is used to drive the rotary device to swing relative to the fixing device;

[0011] a tool device and a telescopic drive, wherein the tool device is rotatably mounted on the rotary device and includes an actuating tool, and the telescopic drive is connected between the tool device and the rotary device and is used to drive the tool device to swing relative to the rotary device;

[0012] During the net breaking operation of the net breaking device, the execution cutter extends to the bottom of the anchor net under the action of the telescopic drive, and the execution cutter cuts the anchor net through the swing of the rotary device and / or the extension and retraction of the telescopic drive.

[0013] In some embodiments, the mesh breaking device has a storage state, in which the rotating device and the cutter device are stored in the recess, and the rotating device is located between the cutter device and the fixing device.

[0014] In some embodiments, one end of the rotary device is rotatably connected to the bottom wall of the recess, one end of the tool device is rotatably connected to the other end of the rotary device, and the execution tool is disposed at the other end of the tool device;

[0015] In the storage state, the rotating device extends rearward from the connection with the recess, the tool device extends forward from the connection with the rotating device, and the connection between the rotating device and the fixing device is located between the execution tool and the connection between the tool device and the rotating device.

[0016] In some embodiments, the fixing device comprises:

[0017] A fixed cover plate and a fixed pad plate, wherein the fixed pad plate is arranged below the fixed cover plate and spaced apart from the fixed cover plate, and both the fixed cover plate and the fixed pad plate are stepped to limit the recess at the front side of the fixing device;

[0018] A plurality of fixed inner ribs, each of which is supported between the fixed cover plate and the fixed pad plate and arranged at intervals along the front-rear direction;

[0019] A fixed front rib plate, the fixed front rib plate is disposed at the front side of the recess and arranged vertically, and the rotary drive is rotationally connected to the fixed front rib plate;

[0020] A fixed front reinforcing rib plate, wherein the fixed front reinforcing rib plate is arranged at an angle formed by the fixed front vertical rib plate and the fixed cover plate;

[0021] A plurality of fixed bottom reinforcing ribs are provided on the bottom side of the fixed pad and are arranged at intervals along the front-rear direction, and the fixed bottom reinforcing ribs are connected and fixed to the shield beam.

[0022] In some embodiments, two fixed front vertical rib plates are provided, and the two fixed front vertical rib plates are arranged at intervals in the front-to-back direction, and a fixed front cross rib plate is provided between the two fixed front vertical rib plates. A first fixed ear seat is provided on the rear side of the fixed front vertical rib plate located on the rear side of the two fixed front vertical rib plates, and the first fixed ear seat is rotationally connected to the rotary drive. The fixed cover plate is provided with a second fixed ear seat, and the second fixed ear seat is arranged in the recess, and the rotary device is rotationally connected to the second fixed ear seat.

[0023] In some embodiments, the rotating device comprises:

[0024] A cover plate assembly, the cover plate assembly comprising an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged at an interval, and the cover plate assembly comprises a first section and a second section arranged at an angle, in the storage state, the first section is in contact with the bottom wall of the recess, and the second section is in contact with the inclined side wall of the recess;

[0025] A revolving main rib plate connected between the upper cover plate and the lower cover plate;

[0026] A third fixed ear seat, the third fixed ear seat is arranged on the first section, and the third fixed ear seat is connected to the telescopic drive rotation;

[0027] A fourth fixed ear seat, the fourth fixed ear seat is arranged on the second section, and the fourth fixed ear seat is rotatably connected to the tool device;

[0028] A rotary push ear seat, wherein the rotary push ear seat is arranged at the first section and is rotationally connected to the rotary drive.

[0029] In some embodiments, the upper cover plate is provided with a first slot and a second slot, the third fixed ear seat is connected to the lower cover plate and extends from the first slot, and the rotary push ear seat is connected to the lower cover plate and extends from the second slot;

[0030] The upper cover plate is provided with a plurality of limit seats, the first slot is provided between two of the limit seats, and in the storage state, the limit seat and the telescopic drive stop and limit;

[0031] And / or, each of the rotating devices is provided with a plurality of the tool devices and the telescopic drive, the plurality of the tool devices are arranged at intervals along the width direction of the rotating device, the plurality of the telescopic drives are rotatably connected to the plurality of the tool devices one by one, and the rotating drive is arranged between two adjacent tool devices.

[0032] In some embodiments, the tool device comprises:

[0033] Tool top plate;

[0034] A plurality of tool main ribs, each of which is connected to the tool top plate and arranged at intervals in the width direction of the tool top plate;

[0035] An inner longitudinal rib plate and a plurality of inner transverse rib plates, wherein the inner longitudinal rib plate is arranged to extend along the extension direction of the tool device, and the plurality of inner transverse rib plates are arranged at intervals in the extension direction of the inner longitudinal rib plate, and each of the inner transverse rib plates is arranged to cross the inner longitudinal rib plate;

[0036] One end of the tool main rib plate and the inner longitudinal rib plate is provided with a plurality of the execution tools, and the other end of the tool main rib plate and the inner longitudinal rib plate is provided with a movable ear seat, and the movable ear seat is rotatably connected to the fixing device.

[0037] In some embodiments, the support unit includes a support column, the support column is provided with a pressure sensor, and the shield beam is provided with a distance sensor.

[0038] The network breaking method of the embodiment of the present invention comprises the following steps:

[0039] Observe the roof and determine the location of the broken net;

[0040] Performing action planning according to the determined network breaking position, wherein the action planning includes a path and a posture;

[0041] Controlling the rotary drive and the telescopic drive to execute the action plan and complete the cutting of the anchor net through the execution tool, and under the coordinated action of the rotary drive and the telescopic drive, the moving trajectory of the execution tool is a straight line;

[0042] After the anchor net at the broken net position is cut, the rotary drive and the telescopic drive are reset.

[0043] Beneficial effect: The top coal caving and mesh breaking end bracket and mesh breaking method of the embodiments of the present invention can realize the cutting of the roof anchor mesh, thereby avoiding the situation that the roof of the goaf is difficult to collapse in time due to the support of the anchor mesh, improving the top coal recovery rate in the end triangle area, and also improving the manifestation of mine pressure on the working face, thereby improving the safety of the mining operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a side schematic diagram of the mesh breaking end bracket according to an embodiment of the present invention.

[0045] Figure 2 It is a top view schematic diagram of the mesh breaking end bracket according to an embodiment of the present invention.

[0046] Figure 3It is a side schematic diagram of a net breaking device according to an embodiment of the present invention.

[0047] Figure 4 It is a schematic diagram of a fixing device of a net breaking device according to an embodiment of the present invention.

[0048] Figure 5 It is a schematic diagram of a rotating device of a net breaking device according to an embodiment of the present invention.

[0049] Figure 6 It is a three-dimensional schematic diagram of the overall structure of the net breaking device according to an embodiment of the present invention.

[0050] Figure 7 Schematic diagram of a cutter device of a mesh breaking device according to an embodiment of the present invention.

[0051] Figure 8 It is a schematic diagram of the action of the rotary drive and telescopic drive of the net breaking device according to an embodiment of the present invention.

[0052] Fig. 9 It is a schematic diagram of the use status of the net breaking device according to an embodiment of the present invention.

[0053] Fig.10 It is a flowchart of the network breaking process of the network breaking device according to an embodiment of the present invention.

[0054] Reference numerals:

[0055] 1-bracket unit; 11-front bracket; 111-front top beam; 112-front column; 113-front base; 114-front stabilizing mechanism; 12-middle bracket; 121-middle top beam; 122-middle column; 123-middle base; 13-rear bracket; 131-rear top beam; 132-rear column; 133-rear base; 134-shielding beam; 135-rear connecting rod; 14-guard plate connecting seat; 15-inner guard plate; 16-outer guard plate; 17-guide cylinder;

[0056] 2- Anchor breaking device;

[0057] 3-net breaking device; 31-fixing device; 311-recess; 3111-inclined side wall; 312-fixing pad; 313-fixing cover plate; 314-fixing inner rib plate; 315-fixing front vertical rib plate; 316-fixing front reinforcing rib plate; 317-fixing bottom reinforcing rib plate; 318-fixing front transverse rib plate; 319-first fixing ear seat; 3110-second fixing ear seat; 32-rotating device; 321-upper cover plate; 3211-first slot; 3212 - second slot; 322 - lower cover plate; 323 - main swivel rib plate; 324 - third fixed ear seat; 325 - fourth fixed ear seat; 326 - swivel push ear seat; 327 - first section; 328 - second section; 329 - limit seat; 33 - swivel drive; 34 - tool device; 341 - execution tool; 342 - tool top plate; 343 - main swivel rib plate; 344 - inner longitudinal rib plate; 345 - inner transverse rib plate; 346 - movable ear seat; 35 - telescopic drive. DETAILED DESCRIPTION

[0058] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0059] like Figure 1 As shown, the top coal caving mesh breaking end support (hereinafter referred to as the mesh breaking end support) of the embodiment of the present invention includes a plurality of support units 1 and at least one mesh breaking device 3. The plurality of support units 1 are sequentially connected along the direction from front to back, and the rearmost support unit 1 includes a shielding beam 134.

[0060] For example, Figure 1 and Figure 2 As shown, three support units 1 can be provided, and the top beams and bases of the three support units 1 can be connected in sequence from front to back, and each support unit 1 can be an independent hydraulic support, thereby meeting the use needs of large-scale support in the mining tunnel. In some other embodiments, the support unit 1 can also be provided in two, four, etc.

[0061] The rearmost support unit 1 among the three support units 1 may include a shielding beam 134, which may be arranged generally in an inclined direction from the upper front to the lower rear, thereby preventing the gangue falling from the goaf from entering the working face.

[0062] like Figure 3 As shown, the mesh breaking device 3 includes a fixing device 31 , a rotating device 32 , a rotating drive 33 , a tool device 34 and a telescopic drive 35 .

[0063] The fixing device 31 is embedded in the shielding beam 134 and is provided with a recess 311. For example, the shielding beam 134 may be provided with a recess, and the fixing device 31 may be plate-shaped as a whole, and the fixing device 31 may be directly fixed in the recess of the shielding beam 134 by welding. The setting of the fixing device 31 can provide a mounting base on the one hand, and can also block the recess on the shielding beam 134 on the other hand, thereby achieving a slag blocking effect.

[0064] It should be noted that the fixing device 31 can be roughly in the shape of a step, that is, the front side of the fixing device 31 can be lower than the rear side of the fixing device 31, and the recess 311 is the lower area on the front side of the fixing device 31. The setting of the recess 311 can, on the one hand, enhance the structural strength, and on the other hand, provide installation space for the subsequent rotating device 32, etc., thereby avoiding the protrusion of the rotating device 32, etc.

[0065] The rotating device 32 is rotatably mounted in the recess 311, and the rotary drive 33 is connected between the fixing device 31 and the rotating device 32 and is used to drive the rotating device 32 to swing relative to the fixing device 31. Figure 3 As shown, the rotating device 32 can be generally a plate-shaped structure, and the front side of the rotating device 32 can be hinged to the fixing device 31 .

[0066] The rotary drive 33 can be a hydraulic jack, one end of the rotary drive 33 can be hinged to the fixing device 31, and the other end of the rotary drive 33 can be hinged to the rotary device 32. When in use, the rotary device 32 can be pulled and pushed by the extension and retraction of the rotary drive 33, thereby realizing the swing adjustment of the rotary device 32 in the front and rear directions.

[0067] The tool device 34 is rotatably mounted on the rotating device 32 and includes an executing tool 341 . The telescopic drive 35 is connected between the tool device 34 and the rotating device 32 and is used to drive the tool device 34 to swing relative to the rotating device 32 .

[0068] For example, Figure 3 As shown, the tool device 34 as a whole can be a plate-like structure, the tool device 34 can be arranged above the rotating device 32, and the rear end of the tool device 34 can be hinged to the rotating device 32, the execution tool 341 can be a blade with a cutting function, etc., and the execution tool 341 can be integrally formed at the front end of the tool device 34.

[0069] The telescopic drive 35 may be a hydraulic jack, one end of the telescopic drive 35 may be hinged to the tool device 34, and the other end of the telescopic drive 35 may be hinged to the rotary device 32. When in use, the tool device 34 may be pushed or pulled by the telescopic drive 35, and the tool device 34 may be driven to swing in the front and rear directions.

[0070] During the net breaking operation of the net breaking device 3 , the execution cutter 341 is extended to the bottom of the anchor net under the action of the telescopic drive 35 , and the execution cutter 341 cuts the anchor net through the swing of the rotating device 32 and / or the extension and retraction of the telescopic drive 35 .

[0071] For example, in the process of breaking the net, the above-mentioned tool device 34 and the rotating device 32 can be swung out from the recess 311. After being swung out, the execution tool 341 can move forward under the joint action of the rotating drive 33 and the telescopic drive 35, so as to achieve the cutting of the anchor net on the top plate of the tunnel.

[0072] The top coal caving and mesh breaking end head bracket of the embodiment of the present invention can realize the cutting of the roof anchor net, thereby avoiding the situation that the roof of the goaf is difficult to collapse in time due to the support of the anchor net, improving the top coal recovery rate of the end triangle area, and also improving the manifestation of mine pressure on the working face, thereby improving the safety of the mining operation.

[0073] In some embodiments, the mesh breaking device 3 has a storage state. In the storage state, the rotating device 32 and the knife device 34 are stored in the recess 311 , and the rotating device 32 is located between the knife device 34 and the fixing device 31 .

[0074] For example, Figure 3 As shown, when the net breaking operation is required, the net breaking device 3 can be switched to the storage state. In the storage state, the rotating device 32 and the tool device 34 are both swung into the recess 311, wherein the rotating device 32 can be in contact with the bottom wall and the side wall of the recess 311, and the tool device 34 can be overlapped on the top of the rotating device 32, and the tool device 34 can be pressed on the top side of the rotating device 32.

[0075] In this way, the whole formed by the mesh breaking device 3 and the shielding beam 134 can be prevented from protruding from the upper surface of the shielding beam 134, thereby avoiding the situation where contact interference is easy to occur. Secondly, the overlapping arrangement of the tool device 34, the rotating device 32, and the fixing device 31 can also make the whole have a higher impact resistance structural strength, which fully meets the use needs of blocking coal gangue.

[0076] In some embodiments, one end of the rotating device 32 is rotatably connected to the bottom wall of the recess 311 , one end of the tool device 34 is rotatably connected to the other end of the rotating device 32 , and the execution tool 341 is disposed at the other end of the tool device 34 .

[0077] For example, Figure 1As shown, in the storage position, the rotating device 32 and the tool device 34 can generally extend along the front-to-back direction, wherein the front end of the rotating device 32 can be hinged to the bottom wall of the recess 311, and the rear end of the rotating device 32 can be hinged to the tool device 34, and the above-mentioned execution tool 341 can be integrally formed at the front end of the tool device 34.

[0078] In the stored state, the rotary device 32 extends rearward from the connection with the recess 311, and the cutter device 34 extends forward from the connection with the rotary device 32, for example, Figure 1 As shown, during the process of being stored in the recess 311, the rotating device 32 and the tool device 34 have the same swinging direction, wherein the rotating device 32 can swing toward the rearward and downward direction until it fits with the fixing device 31, and the tool device 34 can generally swing toward the forward and downward direction and be pressed onto the above-mentioned rotating device 32.

[0079] In the front-to-back direction, the connection between the rotating device 32 and the fixing device 31 is located between the execution tool 341 and the connection between the tool device 34 and the rotating device 32. Therefore, on the one hand, the connection can be roughly in the middle, which is conducive to ensuring the stability of the overall structure, and on the other hand, the connection between the rotating device 32 and the fixing device 31 can be spaced a certain distance from the front side of the recess 311, so that the execution tool 341 can be inserted into the space, thereby enhancing the compactness of storage.

[0080] In some embodiments, Figure 4 As shown, the fixing device 31 includes a fixed cover plate 313 , a fixed pad plate 312 , a plurality of fixed inner ribs 314 , a fixed front vertical rib plate 315 , a fixed front reinforcing rib plate 316 and a plurality of fixed bottom reinforcing rib plates 317 .

[0081] The fixing pad 312 is disposed below the fixing cover 313 and is spaced apart from the fixing cover 313. The fixing cover 313 and the fixing pad 312 are both stepped to limit the recess 311 at the front side of the fixing device 31. Figure 4 As shown, the fixed pad 312 and the fixed cover 313 can be generally Z-shaped, that is, the middle parts of the fixed pad 312 and the fixed cover 313 are bent and are generally arranged in an inclined direction from the front bottom to the rear top. The recess 311 is formed in the lower area of ​​the front side of the fixed cover 313 and the fixed pad 312.

[0082] The plurality of fixed inner ribs 314 are supported between the fixed cover plate 313 and the fixed pad plate 312 and are arranged at intervals along the front-to-back direction. Figure 4As shown, the fixed inner ribs 314 can extend in the left-right direction, and the fixed inner ribs 314 can be perpendicular to the fixed cover plate 313 and the fixed pad plate 312, so as to fully support and fix the fixed cover plate 313 and the fixed pad plate 312, thereby ensuring the overall structural strength of the fixing device 31.

[0083] The fixed front rib plate 315 is disposed at the front side of the recess 311 and arranged vertically, and the rotary drive 33 is rotatably connected to the fixed front rib plate 315. Figure 4 As shown, the fixed front rib plate 315 can be generally arranged vertically and extend in the left-right direction, and the bottom side of the fixed front rib plate 315 can be welded and fixed to the fixed pad plate 312. The above-mentioned recess 311 is formed between the fixed front rib plate 315 and the middle inclined section of the fixed cover plate 313, and the front end of the slewing drive 33 can be hinged to the fixed front rib plate 315.

[0084] The fixed front reinforcing rib plate 316 is disposed at the angle formed by the fixed front vertical rib plate 315 and the fixed cover plate 313. Figure 4 As shown, the fixed front reinforcing rib plates 316 can all be triangular and two can be provided. The two fixed front reinforcing rib plates 316 can be arranged at intervals along the left-right direction, thereby enhancing the structural strength between the fixed front vertical rib plate 315 and the fixed cover plate 313.

[0085] A plurality of fixed bottom reinforcing ribs 317 are disposed on the bottom side of the fixed pad 312 and are arranged at intervals along the front-to-back direction, and the fixed bottom reinforcing ribs 317 are connected and fixed to the shield beam 134. Figure 4 As shown, two fixed bottom reinforcing ribs 317 may be provided, and both of the two fixed bottom reinforcing ribs 317 may be in the shape of long plates and may extend in the left-right direction, and both of the two fixed bottom reinforcing ribs 317 may be arranged vertically and spaced apart in the front-back direction.

[0086] During assembly, the left and right sides of the two fixed bottom reinforcing ribs 317 can be fixedly connected to the side walls of the shielding beam 134 by welding, thereby further enhancing the overall structural strength.

[0087] In some embodiments, Figure 4 As shown, two fixed front vertical rib plates 315 are provided, and the two fixed front vertical rib plates 315 are arranged at intervals in the front-to-back direction, and a fixed front transverse rib plate 318 is provided between the two fixed front vertical rib plates 315, so as to enhance the front structural strength of the fixing device 31.

[0088] The first fixed ear seat 319 is provided at the rear side of the rear fixed front rib plate 315 of the two fixed front rib plates 315, and the first fixed ear seat 319 is rotatably connected to the rotary drive 33. The fixed cover plate 313 is provided with a second fixed ear seat 3110, and the second fixed ear seat 3110 is provided in the recess 311, and the rotary device 32 is rotatably connected to the second fixed ear seat 3110. This facilitates the installation of the rotary drive 33 and the telescopic drive 35.

[0089] In some embodiments, Figure 5 As shown, the rotating device 32 includes a cover plate assembly, a rotating main rib plate 323 , a third fixed ear seat 324 , a fourth fixed ear seat 325 and a rotating sliding ear seat 326 .

[0090] like Figure 5 As shown, the cover plate assembly includes an upper cover plate 321 and a lower cover plate 322, which are arranged at intervals, and the cover plate assembly includes a first section 327 and a second section 328 arranged at an angle, that is, the cover plate assembly is V-shaped as a whole, and in the storage state, the first section 327 is in contact with the bottom wall of the recess 311, and the second section 328 is in contact with the inclined side wall 3111 of the recess 311. Thus, on the one hand, the overall structural strength of the rotating device 32 can be improved, and on the other hand, the shape of the rotating device 32 can be adapted to the shape of the corresponding wall of the recess 311, so that the rotating device 32 can be fully in contact with the fixing device 31, ensuring the structural stability and compactness in the storage state.

[0091] The rotary main rib plate 323 is connected between the upper cover plate 321 and the lower cover plate 322. Figure 5 As shown, two rotating main ribs 323 may be provided, and both rotating main ribs 323 may be substantially V-shaped, and the two rotating main ribs 323 may be respectively provided on the left and right sides of the upper cover plate 321 and the lower cover plate 322 and are both connected between the upper cover plate 321 and the lower cover plate 322. Thus, the rotating device 32 is a box-type structure as a whole, ensuring the overall structural strength.

[0092] The third fixed ear seat 324 is disposed in the first section 327, and the third fixed ear seat 324 is rotatably connected to the telescopic drive 35. The fourth fixed ear seat 325 is disposed in the second section 328, and the fourth fixed ear seat 325 is rotatably connected to the tool device 34. The rotary push ear seat 326 is disposed in the first section 327, and the rotary push ear seat 326 is rotatably connected to the rotary drive 33.

[0093] In some embodiments, the upper cover plate 321 is provided with a first slot 3211 and a second slot 3212 , the third fixed ear seat 324 is connected to the lower cover plate 322 and extends from the first slot 3211 , and the rotary push ear seat 326 is connected to the lower cover plate 322 and extends from the second slot 3212 .

[0094] For example, Figure 5 As shown, the first slot 3211 and the second slot 3212 can both be rectangular slots and can extend in the front-to-back direction, the third fixed ear seat 324 can be welded and fixed on the lower cover plate 322, and the top of the third fixed ear seat 324 can extend from the first slot 3211 and be connected to the telescopic drive 35. The rotary push ear seat 326 can also be welded and fixed on the lower cover plate 322, and the top of the rotary push ear seat 326 can extend from the second slot 3212 and be connected to the rotary drive 33.

[0095] The upper cover 321 is provided with a plurality of limit seats 329, and the first slot 3211 is provided between two limit seats 329. In the storage state, the limit seats 329 and the telescopic drive 35 are blocked and limited. For example, a limit seat 329 can be provided on both sides of each first slot 3211. When in the storage state, the telescopic drive 35 can be stuck between the two limit seats 329, thereby playing the role of limiting the left and right directions and improving the overall structural stability. Secondly, the limit seat 329 can also stop against the tool device 34, thereby limiting the maximum amplitude of the downward swing of the tool device 34.

[0096] In some embodiments, each rotating device 32 is provided with a plurality of tool devices 34 and a telescopic drive 35, the plurality of tool devices 34 are arranged at intervals along the width direction of the rotating device 32, the plurality of telescopic drives 35 are rotatably connected to the plurality of tool devices 34 one by one, and the rotating drive 33 is arranged between two adjacent tool devices 34.

[0097] For example, Figure 6 As shown, each rotating device 32 can be provided with two tool devices 34 and two telescopic drives 35. The two tool devices 34 can be arranged at intervals in the left-right direction, and the two telescopic drives 35 can be connected to the two tool devices 34 in a one-to-one correspondence. Therefore, on the one hand, the operating area for breaking the net can be increased, and on the other hand, the tool devices 34 at different positions can operate independently, thereby meeting the needs of differential operations caused by the uneven ups and downs of the top plate.

[0098] Secondly, it is also beneficial to reduce the reverse force on the single tool device 34 , so that the force applied by the telescopic drive 35 and the rotary drive 33 can fully meet the use requirements of the single tool device 34 operation.

[0099] In some embodiments, Figure 7 As shown, the tool device 34 includes a tool top plate 342 , a plurality of tool main ribs 343 , an inner longitudinal rib 344 and a plurality of inner transverse ribs 345 .

[0100] The plurality of tool main ribs 343 are connected to the tool top plate 342 and are arranged at intervals in the width direction of the tool top plate 342. Figure 7 As shown, two tool main ribs 343 can be provided, both of which can be V-shaped and can be welded and fixed under the tool top plate 342, one of the tool main ribs 343 is located on the left side of the tool top plate 342, and the other is located on the right side of the tool top plate 342.

[0101] The inner longitudinal ribs 344 are arranged to extend along the extension direction of the cutter device 34, and a plurality of inner transverse ribs 345 are arranged at intervals in the extension direction of the inner longitudinal ribs 344, and each inner transverse rib 345 is arranged to cross the inner longitudinal ribs. Figure 7 As shown, there may be only one inner longitudinal rib plate 344, which may be disposed between two tool main rib plates 343. There may be four inner transverse rib plates 345, which may extend in the left-right direction and be arranged at intervals in the front-back direction, and each inner transverse rib plate 345 may be connected to the two tool main rib plates 343 and the inner longitudinal rib plate 344, thereby ensuring the overall structural strength.

[0102] like Figure 7 As shown, one end of the tool main rib plate 343 and the inner longitudinal rib plate 344 are each provided with a plurality of execution tools 341 , and the other end of the tool main rib plate 343 and the inner longitudinal rib plate 344 are each provided with a movable ear seat 346 , and the movable ear seat 346 is rotatably connected to the fixing device 31 .

[0103] In some embodiments, the support unit 1 includes a support column, the support column is provided with a pressure sensor, and the shield beam 134 is provided with a distance sensor.

[0104] For example, Figure 1 As shown, there are three bracket units 1, which are respectively a front bracket 11, a middle bracket 12 and a rear bracket 13 arranged in sequence from front to back. The front bracket 11 includes a front top beam 111, a front column 112, a front base 113 and a front stabilizing mechanism 114, the middle bracket 12 includes a middle top beam 121, a middle column 122, a middle base 123, and the rear bracket 13 includes a rear top beam 131, a rear column 132, a rear base 133 and a shielding beam 134. The front column 112, the middle column 122 and the rear column 132 all constitute support columns, and each support column can be provided with at least one set of pressure sensors.

[0105] The front column 112 is supported and assembled between the front top beam 111 and the front base 113. For example, two front columns 112 may be provided, and the two front columns 112 may be arranged in parallel and spaced apart in the left-right direction. The front stabilizing mechanism 114 is provided at the front side of the front column 112 and protrudes toward the front side. For example, the front stabilizing mechanism 114 may include two front connecting rods, and the two front connecting rods may be connected in the up-down direction. The top end of the front connecting rod located at the upper side may be hinged to the front top beam 111, and the bottom end of the front connecting rod located at the lower side may be hinged to the front base 113. The two front connecting rods are generally V-shaped, and the connection between the two front connecting rods may protrude forward.

[0106] The middle column 122 is supported and assembled between the middle top beam 121 and the middle base 123, for example, Figure 1 As shown, the top end of the middle column 122 can be hinged to the middle top beam 121, and the bottom end of the middle column 122 can be hinged to the middle base 123. The rear column 132 is supported and assembled between the rear top beam 131 and the rear base 133, for example, Figure 1 As shown, the top end of the rear pillar 132 can be hinged to the rear top beam 131 , and the bottom end of the rear pillar 132 can be hinged to the rear base 133 .

[0107] The shield beam 134 is mounted on the rear side of the rear top beam 131, for example Figure 1 As shown, the shielding beam 134 can be arranged tilted from the front upper to the rear lower direction, the shielding beam 134 and the rear base 133 can be connected by two rear connecting rods 135, the two rear connecting rods 135 can be arranged in sequence in the front and rear directions, and the two rear connecting rods 135 can be arranged tilted generally from the front lower to the rear upper direction.

[0108] The shielding beam 134 may include two beam bodies arranged opposite to each other in the left-right direction, and the distance measuring sensor may be arranged between the two beam bodies. The above-mentioned pressure sensor and distance measuring sensor may be used to calculate the inclination angle and pressure of the top plate behind the net breaking end bracket, thereby facilitating the control of the net breaking device 3 to perform the net breaking operation.

[0109] The number of the front pillars 112 and the rear pillars 132 are both less than the number of the center pillars 122. For example, Figure 1 As shown, the number of the front pillars 112 and the rear pillars 132 can be the same, for example, there can be two front pillars 112 and two rear pillars 132, and the two front pillars 112 or the two rear pillars 132 are arranged opposite to each other in the left-right direction. There can be four middle pillars 122, and the four middle pillars 122 can be arranged diagonally, that is, the four middle pillars 122 can be divided into two rows in the front-to-back direction, and each row can include two middle pillars 122 arranged at intervals in the front-to-back direction.

[0110] As a result, the middle part of the net-breaking end head bracket has a higher supporting strength, which is beneficial to improving the overall supporting strength and structural stability of the net-breaking end head bracket.

[0111] The front top beam 111, the middle top beam 121, and the rear top beam 131 are provided with side guard plates inside and on the side facing the coal wall. Figure 2 As shown, the side guard plates can be divided into inner guard plates 15 and outer guard plates 16 according to different assembly positions. The front top beam 111, the middle top beam 121, and the rear top beam 131 can include two longitudinal beams arranged relatively in the left-right direction, each longitudinal beam generally extends along the front-to-back direction, and the inner side of each longitudinal beam can be equipped with two inner guard plates 15 arranged at intervals in the front-to-back direction, so as to meet the need of inner protection.

[0112] like Figure 2 As shown, in actual use, the side of the front top beam 111, the middle top beam 121, and the rear top beam 131 facing the coal wall can be the left side, and the left side of the longitudinal beam on the left side of each top beam can be equipped with an outer guard plate 16, so as to also play a protective role. Specifically, as Figure 1 As shown, a guard plate connecting seat 14 can be installed on the left side of the left longitudinal beam, and the outer guard plate 16 can be installed and fixed to the corresponding top beam through the guard plate connecting seat 14.

[0113] In some embodiments, Figure 2 As shown, a guide cylinder 17 may be installed between the two longitudinal beams of each top beam, so as to prevent deformation and enhance stability.

[0114] In some embodiments, Figure 1 As shown, the front end of the top beam of the frontmost bracket unit 1 of the net breaking end bracket can be equipped with an anchor breaking device 2, and the anchor breaking device 2 can include hydraulic shearing pliers, etc., thereby meeting the need for using shear anchor rods during the frame moving process.

[0115] The following describes a method for breaking a network according to an embodiment of the present invention.

[0116] The network breaking method of the embodiment of the present invention comprises the following steps:

[0117] A1: Observe the roof and determine the position of the broken net. For example, two sets of pressure sensors are installed on the front column 112, the middle column 122, and the rear column 132, respectively, and a set of distance sensors are installed on the inner side of the two shield beams 134. The pressure sensor and the distance sensor can be used to calculate the inclination angle and pressure of the roof behind the bracket. In this way, the observation of the roof can be achieved, and the distance between the anchor net and the broken net end bracket can be measured by the distance sensor, that is, the position of the broken net can be obtained.

[0118] A2: Action planning is performed according to the determined net breaking position, and the action planning includes path and posture. For example, according to the top plate position determined by the ranging sensor, the processor can perform data calculation and execute the path planning of the tool 341, so as to determine the working path and posture of the net breaking device 3. The jack stroke control instruction can be generated through the determined working path and posture, and the action control is further performed through the electro-hydraulic control valve and the jack stroke sensor.

[0119] A3: The rotary drive 33 and the telescopic drive 35 are controlled to execute the action plan and the cutting of the anchor net is completed by executing the tool 341 , and under the coordinated action of the rotary drive 33 and the telescopic drive 35 , the moving trajectory of the executing tool 341 is a straight line.

[0120] For example, Figure 8 As shown, when performing the net breaking operation, the rotation posture control can be performed first, that is, the push rod of the rotation drive 33 can be retracted, and through the hinge point of the rotation drive 33 and the rotation push ear seat 326, the rotation device 32 as a whole is driven to rotate counterclockwise around the second fixed ear seat 3110 of the rotation device 32, so that the rotation device 32 can be swung out of the recess 311.

[0121] Then the push rod of the telescopic drive 35 can be extended, and the tool device 34 can be pushed to rotate clockwise around the two sets of hinge holes at the front end of the rotating device 32 through the push rod of the telescopic drive 35 and the hinge holes of the inner longitudinal rib plate 344 of the tool device 34, so that the tool device 34 can be swung out.

[0122] When the tool device 34 and the rotating device 32 are both swung out, Fig. 9 As shown, the execution tool 341 can be moved to the initial point of the net breaking, and then the execution tool 341 can be driven to move forward by driving the rotary drive 33 to extend, driving the telescopic drive 35 to retract, etc. During the movement of the execution tool 341, the anchor net on the top plate of the tunnel can be cut, thereby realizing the net breaking operation.

[0123] It should be noted that, in the process of the execution tool 341 moving from the back to the front, the movement trajectory of the execution tool 341 can be controlled by the coordinated action of the rotary drive 33 and the telescopic drive 35, that is, Fig. 9 As shown, the execution tool 341 can move in a straight line as a whole, that is, the above action sequence and amplitude can be centrally controlled by an intelligent control algorithm, and the action sequence and the rotation angle of each level of the rotating device 32 can be dynamically adjusted according to the specific conditions of the roof to ensure that the mesh breaking device 3 fits the roof coal wall, thereby avoiding the situation where the execution tool 341 cuts too deeply into the tunnel roof, while satisfying the cutting of the anchor net, it can reduce unnecessary loss and resistance, and achieve a good mesh breaking effect.

[0124] It should be noted that if Fig.10 As shown, the rotary drive and telescopic drive are equipped with special stroke sensors. During the extension and retraction of the rotary drive 33 and the telescopic drive 35, the stroke sensor can monitor the extension amount, thereby facilitating real-time acquisition of the actual extension amount of the rotary drive 33 and the telescopic drive 35, and then can realize real-time monitoring and confirmation of the moving position of the execution tool 341, and can also realize path trajectory monitoring of the execution tool 341 through the monitoring results.

[0125] A4: After the cutting of the anchor net at the broken net position is completed, reset the rotary drive 33 and the telescopic drive 35. Thereby, the tool device 34 and the rotary device 32 can be reset to the storage state. It should be noted that in the process of swinging out the tool device 34 and the rotary device 32, the rotary drive 33 and the telescopic drive 35 can be carried out at the same time, so that the two-level mechanism posture coupling can be achieved. Similarly, when the tool device 34 and the rotary device 32 are switched to the storage state, the rotary drive 33 and the telescopic drive 35 can also be carried out simultaneously under the processor instruction, so that the two-level mechanism posture coupling can be achieved, and then simultaneous recovery can be achieved.

[0126] A specific example of the mesh breaking end bracket according to an embodiment of the present invention is described below.

[0127] The ultra-large hydraulic support for the top coal mining end of the present invention mainly includes three support units 1 and a mesh breaking device 3. The three support units 1 are respectively a front support 11, a middle support 12 and a rear support 13 arranged in sequence from front to back. The front support 11 includes a front top beam 111, an anchor breaking device 2, a push seat, a push jack, a front base 113, a front column 112, etc. The middle support 12 includes a middle top beam 121, a middle base 123, a middle column 122, etc. The rear support 13 includes a rear base 133, a shielding beam 134, a rear top beam 131, a rear column 132, etc. The three support units 1 also include a guard plate connecting seat 14, a guide cylinder 17, an inner guard plate 15, an outer guard plate 16, etc.

[0128] The mesh breaking device 3 mainly includes a fixed rock blocking device (which can be regarded as a fixed device 31), a primary rotating device (which can be regarded as a rotating device 32), a secondary executing device (which can be regarded as a tool device 34), a primary rotating jack (which can be regarded as a rotating drive 33), and a secondary telescopic jack (which can be regarded as a telescopic drive 35).

[0129] Among them, the fixed rock retaining device is welded as a whole on the inner side of the side plate of the shielding beam 134, and mainly includes a lower pad of the fixing device (which can be regarded as a fixed pad 312), an upper cover of the fixing device (which can be regarded as a fixed cover 313), a fixed ear seat of the rotating device (which can be regarded as a second fixed ear seat 3110), a fixed ear seat of a first-stage rotating jack (which can be regarded as a first fixed ear seat 319), a front vertical rib plate of the fixing device (which can be regarded as a fixed front vertical rib plate 315), a front transverse rib plate of the fixing device (which can be regarded as a fixed front transverse rib plate 318), a front reinforcing rib plate of the fixing device (which can be regarded as a fixed front reinforcing rib plate 316), a bottom support reinforcing rib plate of the fixing device (which can be regarded as a fixed bottom reinforcing rib plate 317), and a rib plate inside the fixing device box (which can be regarded as a fixed inner rib plate 314).

[0130] The specific connection relationship is: the lower pad of the fixing device and the upper cover of the fixing device are welded to the inner side of the shielding beam 134, and together they construct the box structure of the gangue retaining device, and the structure is a "step-type" structure that is low in the front and high in the back. Multiple ribs in the fixing device box are fixedly connected between the lower pad of the fixing device and the upper cover of the fixing device to play a reinforcing role. Two pairs of rotating device fixing ears are symmetrically installed on the front step of the upper cover of the fixing device to hinge and fix the primary rotating device. Two pieces of the front vertical ribs of the fixing device are vertically welded to the front end of the lower pad of the fixing device, and the rear piece of the front vertical ribs of the fixing device is fixedly connected to the upper cover of the fixing device through the front reinforcing ribs of the fixing device. The front transverse rib plate of the fixing device is welded between the front vertical rib plates of the fixing device to play a reinforcing role; a pair of first-stage slewing jack fixing ear seats are symmetrically fixed to the front vertical rib plates of the fixing device, serving as fixed hinged ear seats of the first-stage slewing jack; the two fixing device bottom support reinforcing rib plates are respectively fixed to the fixing device lower pad plate and the side plates of the protective beam 134 to strengthen the connection between the box body and the protective beam 134.

[0131] The primary rotary device mainly includes a lower cover plate of the rotary device (which can be regarded as a lower cover plate 322), an upper cover plate of the rotary device (which can be regarded as an upper cover plate 321), a main rib plate of the rotary device (which can be regarded as a main rib plate), a limit seat of the rotary device (which can be regarded as a limit seat 329), a secondary telescopic jack fixed ear seat (which can be regarded as a third fixed ear seat 324), a movable ear seat of the rotary device, a primary rotary jack push ear seat (rotation push ear seat 326), and a secondary actuator fixed ear seat (which can be regarded as a fourth fixed ear seat 325).

[0132] The specific connection relationship is as follows: the primary rotary device is hinged to the fixed ear seat of the rotary device through the movable ear seat of the rotary device; the lower cover plate of the rotary device and the upper cover plate of the rotary device form a primary rotary device, which is welded to the upper and lower ends of the two symmetrically arranged main ribs of the rotary device to form a box structure. The four limit seats of the rotary device are symmetrically welded above the upper cover plate of the rotary device, which plays a role in limiting the lowest position of the secondary actuator; two pairs of fixed ear seats of the secondary telescopic jack are symmetrically welded to the lower cover plate of the rotary device through the grooves of the upper cover plate of the rotary device, and the periphery is fixedly connected to the upper cover plate of the rotary device; a pair of first-level rotary jack push ear seats are symmetrically welded to the lower cover plate of the rotary device through the grooves of the upper cover plate of the rotary device (which can be regarded as the second groove 3212), and the periphery is fixedly connected to the upper cover plate of the rotary device; two pairs of fixed ear seats of the secondary actuator are fixedly connected to the upper side of the front end of the upper cover plate of the rotary device.

[0133] The secondary actuator mainly includes: the actuator main rib plate (which can be regarded as the tool main rib plate 343), the actuator top plate (which can be regarded as the tool top plate 342), the inner longitudinal rib plate, the inner transverse rib plate 345, the actuator movable ear seat (which can be regarded as the movable ear seat 346), the actuator tool 341, etc., wherein the inner longitudinal rib plate 344 can include the actuator inner longitudinal rib plate, the actuator front longitudinal rib plate, and the actuator rear transverse rib plate. The inner transverse rib plate 345 can include the actuator middle partition plate, the actuator middle transverse rib plate, the actuator front transverse rib plate, etc.

[0134] The specific connection relationship is: the main ribs of the actuators on both sides are welded to the top plate of the actuator, and a hinge hole is provided at the rear end. The inner longitudinal ribs 344 of the actuator are welded to the top plate of the actuator, and the two sides are respectively fixedly connected to the rear transverse ribs of the actuator and the middle partition of the actuator; the rear transverse ribs of the actuator, the middle partition of the actuator, the middle transverse ribs of the actuator, and the front transverse ribs of the actuator are respectively fixedly connected to the main ribs of the actuators on both sides, playing a role in lateral reinforcement. The front longitudinal ribs of the actuator are fixedly connected between the middle transverse ribs of the actuator and the front transverse ribs of the actuator, playing a role in reinforcing the front of the secondary actuator; the execution tool 341 is fixedly connected to the main ribs of the actuator and the front transverse ribs of the actuator, and can be disassembled and replaced as an execution tool.

[0135] The mesh breaking end head bracket of the embodiment of the present invention has the following beneficial effects:

[0136] The net breaking end bracket of the present invention can utilize a pressure sensor and a distance measuring sensor to intelligently identify the top plate situation and determine the net breaking conditions.

[0137] The net breaking end bracket of the present invention has two groups of net breaking devices installed in a symmetrical group manner. The device has a two-degree-of-freedom folding and unfolding function in space, a large operating space, and flexible mechanism movement.

[0138] The net breaking device of the net breaking end bracket of the present invention adopts two hydraulic jacks to control the posture of the terminal execution device, and the execution props can be quickly replaced and maintained according to the working conditions.

[0139] The net breaking device of the net breaking end bracket of the present invention is arranged between two end bracket shielding beams and is fixedly connected to the inner side plates of the shielding beams. It has the function of blocking gangue when retracted and has the function of breaking the net when working.

[0140] The net breaking device of the net breaking end bracket of the present invention has a reasonable arrangement of the jack positions, so that the components of the device do not interfere with each other when the device is retracted and working, and the structure is ingenious.

[0141] The net breaking device of the net breaking end bracket of the present invention adopts a two-stage folding and unfolding mechanism, which can well adapt to the change of the top plate sinking and quickly perform the net breaking process.

[0142] The fixed rock blocking device of the net breaking end bracket of the present invention is fixed in a fixed manner and symmetrically arranged on the inner side of the protective beam. It has high structural strength and presents a "step-type" structure with a low front and a high back as a whole. The rear part mainly plays a role of rock blocking, and the sunken step space at the front can be used to install a rotating device and an actuator.

[0143] The primary rotating device of the net breaking device of the net breaking end bracket of the present invention is "L"-shaped as a whole, and the shape is matched with the fixed gangue blocking device, so that the effective space is reasonably utilized and the gangue is prevented from entering.

[0144] The secondary execution device of the mesh breaking device of the mesh breaking end bracket of the present invention is in an "inverted L" shape as a whole, and the shape is matched with the primary rotating device to prevent gangue from entering and reasonably utilize the effective space.

[0145] The mesh breaking device of the embodiment of the present invention adopts a four-group array arrangement, which reduces the gap between the executing tools and can effectively break the mesh. When breaking the mesh, the executing tools can follow an approximately straight trajectory under the control of a two-stage jack, and can adjust their posture to adapt to the shape of the top plate, with high flexibility in use.

[0146] The mesh breaking device of the embodiment of the present invention has good mesh breaking and roof collapse effects for the ultra-high mining height full-working face top coal caving mining process of the "triangle area" transition support caving. The mesh breaking device is installed on the inner side of the end hydraulic support shielding beam, and has the functions of mesh breaking and rock blocking. The whole is a two-degree-of-freedom mechanism, and adopts a two-stage jack to coordinate the drive control mechanism movement. The control is simple, the driving force is large, the end execution tool posture is adjustable, and the cutting trajectory is a nearly straight line. It can effectively perform fast cutting of the roof anchor mesh. The device has a folding and unfolding function, and the non-working state is a retracted state, which plays a role in blocking rock.

[0147] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0148] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0149] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0150] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0151] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0152] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A top coal caving mesh breaking end bracket, characterized in that: include: A plurality of bracket units and at least one net breaking device, wherein the plurality of bracket units are sequentially connected in a direction from front to back, the rearmost bracket unit comprises a shielding beam, and the net breaking device comprises: A fixing device, the fixing device is embedded in the shield beam and is provided with a recess; A rotary device and a rotary drive, wherein the rotary device is rotatably mounted in the recess, and the rotary drive is connected between the fixing device and the rotary device and is used to drive the rotary device to swing relative to the fixing device; a tool device and a telescopic drive, wherein the tool device is rotatably mounted on the rotary device and includes an actuating tool, and the telescopic drive is connected between the tool device and the rotary device and is used to drive the tool device to swing relative to the rotary device; During the process of the net breaking device performing the net breaking operation, the execution cutter is extended to the bottom of the anchor net under the action of the telescopic drive, and the execution cutter cuts the anchor net through the swing of the rotary device and / or the telescopic drive; The mesh breaking device has a storage state, in which the rotating device and the cutter device are stored in the recess, and the rotating device is located between the cutter device and the fixing device; One end of the rotary device is rotatably connected to the bottom wall of the recess, one end of the tool device is rotatably connected to the other end of the rotary device, and the execution tool is arranged at the other end of the tool device; In the storage state, the rotating device extends rearward from the connection with the recess, the tool device extends forward from the connection with the rotating device, and the connection between the rotating device and the fixing device is located between the execution tool and the connection between the tool device and the rotating device.

2. The top coal caving mesh breaking end support according to claim 1 is characterized in that: The fixing device comprises: A fixed cover plate and a fixed pad plate, wherein the fixed pad plate is arranged below the fixed cover plate and spaced apart from the fixed cover plate, and both the fixed cover plate and the fixed pad plate are stepped to limit the recess at the front side of the fixing device; A plurality of fixed inner ribs, each of which is supported between the fixed cover plate and the fixed pad plate and arranged at intervals along the front-rear direction; A fixed front rib plate, which is disposed at the front side of the recess and arranged vertically, and the rotary drive is rotationally connected to the fixed front rib plate; A fixed front reinforcing rib plate, wherein the fixed front reinforcing rib plate is arranged at an angle formed by the fixed front vertical rib plate and the fixed cover plate; A plurality of fixed bottom reinforcing ribs are provided on the bottom side of the fixed pad and are arranged at intervals along the front-rear direction, and the fixed bottom reinforcing ribs are connected and fixed to the shield beam.

3. The top coal caving mesh breaking end support according to claim 2 is characterized in that: There are two fixed front vertical rib plates, which are arranged at intervals in the front-to-back direction, and a fixed front cross rib plate is provided between the two fixed front vertical rib plates. A first fixed ear seat is provided on the rear side of the fixed front vertical rib plate located on the rear side of the two fixed front vertical rib plates, and the first fixed ear seat is rotationally connected to the rotary drive. The fixed cover plate is provided with a second fixed ear seat, and the second fixed ear seat is arranged in the recess, and the rotary device is rotationally connected to the second fixed ear seat.

4. The top coal caving mesh breaking end support according to claim 1, characterized in that: The rotating device comprises: A cover plate assembly, the cover plate assembly comprising an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged at an interval, and the cover plate assembly comprises a first section and a second section arranged at an angle, in the storage state, the first section is in contact with the bottom wall of the recess, and the second section is in contact with the inclined side wall of the recess; A revolving main rib plate connected between the upper cover plate and the lower cover plate; A third fixed ear seat, the third fixed ear seat is arranged on the first section, and the third fixed ear seat is connected to the telescopic drive rotation; A fourth fixed ear seat, the fourth fixed ear seat is arranged on the second section, and the fourth fixed ear seat is rotatably connected to the tool device; A rotary push ear seat, wherein the rotary push ear seat is arranged at the first section and is rotationally connected to the rotary drive.

5. The top coal caving mesh breaking end support according to claim 4 is characterized in that: The upper cover plate is provided with a first slot and a second slot, the third fixed ear seat is connected to the lower cover plate and extends from the first slot, and the rotary push ear seat is connected to the lower cover plate and extends from the second slot; The upper cover plate is provided with a plurality of limit seats, the first slot is provided between two of the limit seats, and in the storage state, the limit seat and the telescopic drive stop and limit; And / or, each of the rotating devices is provided with a plurality of the tool devices and the telescopic drive, the plurality of the tool devices are arranged at intervals along the width direction of the rotating device, the plurality of the telescopic drives are rotatably connected to the plurality of the tool devices one by one, and the rotating drive is arranged between two adjacent tool devices.

6. The top coal caving mesh breaking end support according to claim 1, characterized in that: The tool device comprises: Tool top plate; A plurality of tool main ribs, each of which is connected to the tool top plate and arranged at intervals in the width direction of the tool top plate; An inner longitudinal rib plate and a plurality of inner transverse rib plates, wherein the inner longitudinal rib plate is arranged to extend along the extension direction of the tool device, and the plurality of inner transverse rib plates are arranged at intervals in the extension direction of the inner longitudinal rib plate, and each of the inner transverse rib plates is arranged to cross the inner longitudinal rib plate; One end of the tool main rib plate and the inner longitudinal rib plate is provided with a plurality of the execution tools, and the other end of the tool main rib plate and the inner longitudinal rib plate is provided with a movable ear seat, and the movable ear seat is rotatably connected to the fixing device.

7. The top coal caving mesh breaking end support according to any one of claims 1 to 6, characterized in that: The support unit comprises a supporting column, the supporting column is provided with a pressure sensor, and the shielding beam is provided with a distance measuring sensor.

8. A method for breaking the mesh based on the top coal caving mesh breaking end support according to any one of claims 1 to 7, characterized in that: The following steps are involved: Observe the roof and determine the location of the broken net; Performing action planning according to the determined network breaking position, wherein the action planning includes a path and a posture; Controlling the rotary drive and the telescopic drive to execute the action plan and complete the cutting of the anchor net through the execution tool, and under the coordinated action of the rotary drive and the telescopic drive, the moving trajectory of the execution tool is a straight line; After the anchor net at the broken net position is cut, the rotary drive and the telescopic drive are reset.

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