A coal placing device

Abstract

This application relates to the technical field of coal release at the end of a conveyor belt roadway in a fully mechanized longwall mining face in thick coal seams, and in particular to a coal release device for an end-face frame. The device includes two symmetrically distributed top beams and a base located below the top beams. Front beams and shield beams are respectively installed on the front and rear sides of the top beams. The top beams and the base are connected by a retractable column support. This invention reduces the area of ​​the rear corner roof overhang by adding a high-level coal release device to the end-face frame and implementing coal release operations, allowing the roof to collapse in a timely manner and avoiding dynamic disasters such as rockbursts caused by sudden collapse of a large area of ​​overhanging roof. This invention also reduces residual coal in the goaf by implementing coal release at the end of the conveyor belt roadway, lowering the risk of spontaneous combustion of residual coal. Furthermore, this invention improves the working face recovery rate, reduces resource waste, and increases economic efficiency by implementing coal release at the end of the conveyor belt roadway.

Description

Technical Field

[0001] This application relates to the technical field of coal release at the end of a conveyor belt roadway in a fully mechanized longwall mining face in thick coal seams, and in particular to a coal release device for an end-of-face support. Background Technology

[0002] The centrally located end support is a type of hydraulic support device used in fully mechanized mining roadways. The end supports are arranged on both sides of the roadway, with the transfer machine distributed in the middle. This device supports the roadway roof and provides self-moving force to the transfer machine by pushing jacks. Therefore, the centrally located roadway end hydraulic support device is an important mining equipment.

[0003] For example, a centrally located hydraulic support device for roadway ends, disclosed in CN208605214U, includes a roadway end hydraulic support device body with a rear top beam and a rear base; a front top beam connected to the rear top beam and acting on the support roof point; a front base connected to the rear base and located on the support foundation point; and a front telescopic column located between the front top beam and the base for lifting the front top beam. The roadway end hydraulic support device body supports the support point, the front top beam increases the support area, and the front base and front telescopic column support the front top beam. Unlike most centrally located end supports which are single-row columns with small base contact areas and top beam support areas, this device eliminates the need for additional temporary support, increasing the support area and improving support efficiency.

[0004] However, the end of a conveyor belt roadway is the junction of the working face and the mining roadway. The front and rear scraper heads, transfer machines and other equipment are closely arranged, and the mine pressure manifestation is complex. In order to ensure the condition of the roof and equipment, the top coal recovery of the roadway is often not carried out. However, this also brings problems such as the roof of the end goaf being difficult to collapse, the large area of ​​the suspended roof, the entry of residual coal into the old goaf, and the easy spontaneous combustion. Therefore, it is urgent to study a safe and practical method for top coal recovery at the end of a conveyor belt roadway. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this application provides a coal discharge device for an end frame, which adopts the following technical solution:

[0006] A coal discharge device at the end of a frame includes two symmetrically distributed top beams and a base located below the top beams. A front beam and a shield beam are respectively provided on the front and rear sides of the top beams. The top beams and the base are connected by a retractable column support.

[0007] The top beam includes a front top beam, a middle top beam, and a rear top beam distributed sequentially along the straight direction of the roadway, and the front top beam, the middle top beam, and the rear top beam are all box-shaped structural components;

[0008] The base includes a front base, a middle base, and a rear base, which are arranged sequentially along the straight direction of the roadway and correspond one-to-one with the front top beam, the middle top beam, and the rear top beam, respectively.

[0009] The column includes a front column, a middle column and a rear column, and a base connecting rod is hinged between the front column and the middle column and between the middle column and the rear column.

[0010] A front column connects the front top beam and the front base, a rear column connects the rear top beam and the rear base, and two central columns connect the middle top beam and the middle base.

[0011] The shield beam is rotatably mounted on the side of the rear top beam away from the middle top beam via lugs and pins. A coal discharge device is provided on the side of the shield beam facing the rear top beam, and the coal discharge device is located at the position of the removed roof support structure on the rear top beam.

[0012] The protective beam and the rear base are supported and connected by a linkage assembly; a front beam jack is connected between the front beam and the front top beam.

[0013] Preferably, the coal discharge device includes a protective plate disposed on the side of the shield beam facing the rear top beam. The side of the protective plate facing the shield beam is inserted into a protective plate base disposed on the shield beam via a pin. The protective plate and the shield beam support are connected by a swing cylinder. The two ends of the swing cylinder are respectively rotatably mounted on a first fixed seat disposed at the bottom of the protective plate and a second fixed seat disposed at the bottom of the shield beam. The protective plate is provided with a coal discharge assembly for further breaking the mesh and discharging coal.

[0014] Preferably, the coal discharge assembly includes a telescopic cylinder installed at the lower end of the protective plate. The protective plate has a groove at the end opposite to the shield beam. A telescopic circular hole is provided at the bottom of the groove. An extension rod is slidably arranged in the telescopic circular hole. A linkage block is installed at the output end of the telescopic cylinder. The extension rod passes through the linkage block and is rotatably installed on the linkage block. A plug is provided on the side of the extension rod opposite to the protective plate.

[0015] Preferably, a spiral groove is provided inside the telescopic circular hole, and a matching rod that slides in the spiral groove is provided on the side wall of the extension rod opposite to the end of the insertion plug;

[0016] The cutting plug has a diameter that gradually decreases from the middle to both sides, and the sidewalls of the cutting plug are evenly provided with several serrated grooves.

[0017] Preferably, the linkage assembly includes a front linkage and a rear linkage. A linkage placement frame is provided at the end of the rear base away from the base connecting rod. The side of the linkage placement frame away from the rear base is inclined from top to bottom, and a first rotating shaft is inserted into the linkage placement frame along its inclined plane. The front linkage is rotatably mounted on the first rotating shaft at the front end of the linkage placement frame, and the rear linkage is rotatably mounted on the first rotating shaft at the rear end of the linkage placement frame. Two second rotating shafts corresponding to the first rotating shafts are also provided on the lower surface of the shield beam. The upper end of the front linkage is rotatably mounted on the second rotating shaft at the front end of the shield beam, and the upper end of the rear linkage is rotatably mounted on the second rotating shaft at the rear end of the shield beam.

[0018] Protective plates are installed on the opposite outer walls of the two protective beams to further expand the protection range.

[0019] Preferably, an outer top plate is installed on the outer side wall of the front top beam, the middle top beam, and the rear top beam. Multiple outer mounting blocks are installed on the side wall of the outer top plate. The outer mounting blocks are rotatably mounted on a first bracket set on the outer side wall of the front top beam, the middle top beam, or the rear top beam via a pin shaft. An outer top jack is hinged between the outer top plate and the outer side wall of the front top beam, the middle top beam, or the rear top beam.

[0020] The inner walls of the front top beam, middle top beam, and rear top beam are all equipped with inner top protection plates. Multiple inner mounting blocks are installed on the side walls of the inner top protection plates. The inner mounting blocks are rotatably mounted on the second brackets set on the inner walls of the front top beam, middle top beam, or rear top beam via pins. An inner top protection jack is hinged between the inner top protection plates and the outer walls of the front top beam, middle top beam, or rear top beam.

[0021] A secondary protective plate is connected to the lower end of the outer protective plate of the top beam located on the rear top beam.

[0022] Preferably, a first connecting lug is provided on the front base, and a lower swing rod is rotatably mounted on the first connecting lug via a pin. The upper end of the lower swing rod is rotatably connected to an upper swing rod via a pin. A second connecting lug is installed on the lower end of the front top beam, and the upper end of the upper swing rod is also rotatably mounted on the second connecting lug via a pin. The connection between the upper swing rod and the lower swing rod is inclined in the direction away from the shield beam.

[0023] Preferably, the lower ends of the front top beam, the middle top beam, and the rear top beam are all provided with adjustment bracket seats, and end connectors are installed on the adjustment bracket seats. Adjustment bracket jacks are connected between the two end connectors along the width direction of the top beam to change the spacing between the two top beams. The number of adjustment bracket jacks located below the front top beam and the rear top beam is one, and the number of adjustment bracket jacks located below the middle top beam is two.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. This invention reduces the rear corner overhang area by adding a high-level coal discharge device to the end frame and implementing coal discharge operations, allowing the roof to collapse in a timely manner and avoiding dynamic disasters such as rockburst caused by the sudden collapse of a large area of ​​overhang.

[0026] 2. This invention reduces residual coal in the goaf by implementing coal release at the end of the conveyor belt roadway, thereby lowering the risk of spontaneous combustion of residual coal.

[0027] 3. This invention improves the working face recovery rate, reduces resource waste, and increases economic benefits by implementing coal release at the end of the conveyor belt roadway.

[0028] 4. The present invention controls the swing cylinder to drive the guard plate to flip up and down on the shield beam, so that the guard plate knocks on the top plate anchor mesh structure, so that the top coal can be dropped smoothly downwards. At the same time, the coal discharge assembly destroys the top plate anchor mesh structure, further improving the efficiency of top coal dropping. Attached Figure Description

[0029] Figure 1 This is a first-view structural schematic diagram of the present invention.

[0030] Figure 2 This is a schematic diagram of the second perspective structure of the present invention.

[0031] Figure 3 This is the present invention. Figure 2 A magnified view of part A.

[0032] Figure 4 This is the present invention. Figure 2 A magnified view of section B.

[0033] Figure 5 This is a schematic diagram of the structure between the front top beam, upper swing arm, lower swing arm and front base of the present invention.

[0034] Figure 6 This is a schematic diagram of the structure of the lower surface of the front top beam of the present invention.

[0035] Figure 7 This is the present invention. Figure 6 A magnified view of a portion of point C.

[0036] Figure 8 This is the present invention. Figure 6 A magnified view of a portion of point D.

[0037] Figure 9 This is a schematic diagram of the linkage assembly of the present invention.

[0038] Figure 10 This is a first-view structural schematic diagram of the coal discharge device of the present invention.

[0039] Figure 11This is a second-view structural schematic diagram of the coal discharge device of the present invention.

[0040] Explanation of reference numerals in the attached drawings: 1. Top beam; 2. Base; 3. Front beam; 4. Shield beam; 5. Column; 11. Front top beam; 12. Middle top beam; 13. Rear top beam; 21. Front base; 22. Middle base; 23. Rear base; 51. Front column; 52. Middle column; 53. Rear column; 24. Base connecting rod; 6. Coal discharge device; 7. Connecting rod assembly; 31. Front beam jack; 14. Adjusting frame seat; 15. End connector; 16. Adjusting frame jack; 211. First connecting lug; 212. Lower swing rod; 213. Upper swing rod; 214. Second connecting lug; 80. Top beam outer protective plate; 81. External mounting block; 82. First clamp; 83. Outer protective plate 84. Top beam inner roof protection plate; 85. Inner mounting block; 86. Second bracket; 87. Inner roof protection jack; 88. Secondary roof protection plate; 71. Front connecting rod; 72. Rear connecting rod; 73. Rod placement frame; 74. First rotating shaft; 75. Second rotating shaft; 41. Protective plate; 61. Protective plate; 62. Protective plate base; 63. Swing cylinder; 64. First fixed seat; 65. Second fixed seat; 66. Coal discharge assembly; 661. Telescopic cylinder; 662. Groove; 663. Telescopic round hole; 664. Extension rod; 665. Linkage block; 666. Insert plug; 6631. Spiral groove; 6641. Matching rod; 6661. Serrated groove. Detailed Implementation

[0041] The following is in conjunction with the appendix Figures 1 to 11 This application will be described in further detail.

[0042] See Figures 1 to 3 This application discloses a coal discharge device 6 at the end of a frame, including two symmetrically distributed top beams 1 and a base 2 located below the top beams 1. A front beam 3 and a shield beam 4 are rotatably installed on the front and rear sides of the top beams 1, respectively. The top beams 1 and the base 2 are connected by a telescopic column 5. The top beams 1 are in direct contact with the top plate and are the main box-shaped structural components that support and maintain the top plate. The pressure of the top plate can be directly transmitted to the base 2 through the column 5.

[0043] The top beam 1 includes a front top beam 11, a middle top beam 12 and a rear top beam 13 distributed sequentially along the straight direction of the roadway. The front top beam 11, the middle top beam 12 and the rear top beam 13 are all box-shaped structural components. The front top beam 11 and the middle top beam 12 are used to maintain the roof of the pedestrian passage, and the rear frame is used to maintain the end roof and to carry out coal release.

[0044] The base 2 includes a front base 21, a middle base 22, and a rear base 23, which are arranged sequentially along the straight direction of the roadway and correspond one-to-one with the front top beam 11, the middle top beam 12, and the rear top beam 13, respectively; the column 5 includes a front column 51, a middle column 52, and a rear column 53, and a base connecting rod 24 is hinged between the front column 51 and the middle column 52, and between the middle column 52 and the rear column 53; the front top beam 11 and the front base 21 are connected by the front column 51, the rear top beam 13 and the rear base 23 are connected by the rear column 53, and two middle columns 52 are connected between the middle top beam 12 and the middle base 22;

[0045] A front beam jack 31 connects the front beam 3 and the front top beam 11. The front beam jack 31 maintains balance to ensure good contact with the top coal and protects the top coal above the coal mining machine, thereby ensuring the normal operation of the workers and the normal operation of the coal mining machine and the front conveyor. The coal mining machine and the front conveyor are existing technologies and will not be described in detail here.

[0046] The shield beam 4 is rotatably installed on the side of the rear top beam 13 away from the middle top beam 12 via ear seats and pins. A coal discharge device 6 is provided on the side of the shield beam 4 facing the rear top beam 13, and the coal discharge device 6 is located at the position of the removed roof protection structure on the rear top beam 13; the coal discharge device 6 is used to break the net and discharge coal.

[0047] The shield beam 4 and the rear base 23 are supported and connected by the connecting rod assembly 7. The shield beam 4 is used to bear the pressure of the top plate and to transmit the pressure to the connecting rod assembly 7 and the base 2. During the transmission process, the shield beam 4 is subjected to torque and bending moment, and is also subjected to the impact of the falling gangue from the top plate.

[0048] The base 2 bears various forces and moments transmitted from the top plate through the column 5, the protective beam 4, the connecting rod, etc., and then to the bottom plate. In addition to having sufficient strength, the base 2 should also have good adaptability to the bottom plate. When under stress, the specific pressure of the front end of the base 2 on the bottom plate should be small, so that the front end of the base 2 does not press into the bottom plate or damage the structure of the bottom plate.

[0049] See Figure 4 Adjustment jacks 14 are provided at the lower ends of the front top beam 11, the middle top beam 12 and the rear top beam 13. End connectors 15 are installed on the adjustment jacks 14. Adjustment jacks 16 are connected between the two end connectors 15 along the width direction of the top beam 1 to change the distance between the two top beams 1. There is one adjustment jack 16 under the front top beam 11 and the rear top beam 13, and two adjustment jacks 16 under the middle top beam 12.

[0050] See Figure 5A first connecting lug 211 is provided on the front base 21, and a lower swing rod 212 is rotatably mounted on the first connecting lug 211 via a pin. The upper end of the lower swing rod 212 is rotatably connected to an upper swing rod 213 via a pin. A second connecting lug 214 is installed at the lower end of the front top beam 11, and the upper end of the upper swing rod 213 is also rotatably mounted on the second connecting lug 214 via a pin. The connection between the upper swing rod 213 and the lower swing rod 212 is inclined in the direction away from the shield beam 4.

[0051] The present invention can ensure the stability of the front top beam 11 through the upper swing rod 213 and the lower swing rod 212. At the same time, the pressure borne by the front top beam 11 can be transmitted to the front base 21 through the upper swing rod 213 and the lower swing rod 212. Under the extension and retraction of the front column 51 and in coordination with the upper swing rod 213 and the lower swing rod 212, the upper front top beam 11 rotates up and down on the left side wall of the middle top beam 12.

[0052] See Figures 6 to 8 The outer walls of the front top beam 11, the middle top beam 12 and the rear top beam 13 are all equipped with outer top protection plates 80. Multiple outer mounting blocks 81 are installed on the side walls of the outer top protection plates 80. The outer mounting blocks 81 are rotatably mounted on the first card seat 82 set on the outer wall of the front top beam 11, the middle top beam 12 or the rear top beam 13 via pin shafts. An outer top protection jack 83 is hinged between the outer top protection plates 80 and the outer walls of the front top beam 11, the middle top beam 12 or the rear top beam 13.

[0053] The inner walls of the front top beam 11, the middle top beam 12, and the rear top beam 13 are all equipped with inner top protection plates 84. Multiple inner mounting blocks 85 are installed on the side walls of the inner top protection plates 84. The inner mounting blocks 85 are rotatably mounted on the second mounting seats 86 set on the inner walls of the front top beam 11, the middle top beam 12, or the rear top beam 13 via pins. An inner top protection jack 87 is hinged between the inner top protection plates 84 and the outer walls of the front top beam 11, the middle top beam 12, or the rear top beam 13.

[0054] The lower end of the outer protective plate 80 of the top beam located on the rear top beam 13 is connected to a secondary protective plate 88 (at... Figure 1 (as shown in the exhibition) to further expand the scope of protection.

[0055] The present invention uses an outer protective jack 83 to drive the outer protective plate 80 of the top beam to rotate, and the inner protective plate 84 of the top beam is driven to rotate by an inner protective jack 87, so that the outer protective plate 80 and the inner protective plate 84 of the top beam can withstand the falling gangue and protect the lower transfer machine.

[0056] See Figure 9The linkage assembly 7 includes a front linkage 71 and a rear linkage 72. A rod placement frame 73 is provided at one end of the rear base 23 away from the base connecting rod 24. The rod placement frame 73 is inclined from top to bottom on the side away from the rear base 23, and a first rotating shaft 74 is inserted into the rod placement frame 73 along its inclined surface. The front linkage 71 is rotatably mounted on the first rotating shaft 74 at the front end of the rod placement frame 73, and the rear linkage 72 is rotatably mounted on the first rotating shaft 74 at the rear end of the rod placement frame 73. Two second rotating shafts 75 are also provided on the lower surface of the shield beam 4, which correspond one-to-one with the first rotating shafts 74. The upper end of the front linkage 71 is rotatably mounted on the second rotating shaft 75 at the front end of the shield beam 4, and the upper end of the rear linkage 72 is rotatably mounted on the second rotating shaft 75 at the rear end of the shield beam 4.

[0057] The protective beam 4, the front connecting rod 71, the rear connecting rod 72, and the rear top beam 13 are hinged to the rear base 23 to form a complete moving whole, so that the protective beam 4 moves up and down according to a certain double-hinged trajectory, thereby ensuring the top control distance of the protective beam 4, while bearing the large horizontal and lateral forces of the protective beam 4, giving the protective beam 4 torsion resistance.

[0058] Protective plates 41 are installed on the opposite outer walls of the two protective beams 4 to further expand the protection range.

[0059] See Figures 9 to 11 The coal discharge device 6 includes a protective plate 61 on the side of the shield beam 4 facing the rear top beam 13. The side of the protective plate 61 facing the shield beam 4 is connected to the protective plate base 62 on the shield beam 4 by a pin. The protective plate 61 and the shield beam 4 are connected by a swing cylinder 63. The two ends of the swing cylinder 63 are respectively rotatably installed on the first fixed seat 64 at the bottom of the protective plate 61 and the second fixed seat 65 at the bottom of the shield beam 4. The protective plate 61 is provided with a coal discharge component 66 for further breaking the screen and discharging coal.

[0060] In the specific implementation process, the present invention controls the swing cylinder 63 to drive the guard plate 61 to flip up and down on the shield beam 4 so that the guard plate 61 knocks on the top plate anchor mesh structure so that the top coal can be dropped smoothly downwards. At the same time, the coal discharge assembly 66 destroys the top plate anchor mesh structure, further improving the efficiency of the top coal dropping.

[0061] The coal discharge assembly 66 includes a telescopic cylinder 661 installed at the lower end of the guard plate 61. The guard plate 61 has a groove 662 at the end away from the shield beam 4. A telescopic circular hole 663 is provided at the bottom of the groove 662. An extension rod 664 is slidably arranged in the telescopic circular hole 663. A linkage block 665 is installed at the output end of the telescopic cylinder 661. The extension rod 664 passes through the linkage block 665 and is rotatably installed on the linkage block 665. A plug 666 is provided on the side of the extension rod 664 away from the guard plate 61.

[0062] In the specific implementation process, when the swing cylinder 63 drives the guard plate 61 to swing up and down, the telescopic cylinder 661 will also drive the inserter 666 to extend and retract towards the top plate through the linkage block 665, so as to crush the top coal and allow the top coal to fall smoothly.

[0063] A spiral groove 6631 is provided inside the telescopic circular hole 663. A matching rod 6641 that slides in the spiral groove 6631 is provided on the side wall of the extension rod 664 away from the end of the insertion plug 666. When the telescopic cylinder 661 drives the extension rod 664 to slide in the telescopic circular hole 663, it is restricted by the spiral groove 6631 in the telescopic circular hole 663, so that the extension rod 664 is driven to rotate in the telescopic circular hole 663 by sliding in the spiral groove 6631 through the matching rod 6641. This drives the insertion plug 666 to rotate synchronously, so that the insertion plug 666 can rotate and agitate the top coal, thereby improving the damage of the top coal by the insertion plug 666.

[0064] The insert 666 has a diameter that gradually decreases from the middle to both sides, and the side wall of the insert 666 is uniformly provided with a number of sawtooth grooves 6661; so that the present invention can further improve the destruction of top coal through the insert 666, improve the recovery rate of the working face, reduce resource waste, and improve economic benefits.

[0065] The implementation principle of this invention is as follows:

[0066] (1): Anchoring removal operation is carried out at the front frame position of the end frame to weaken the active support strength of the roof; during the stepping forward movement of the end frame, the front roof beam 11 and the middle roof beam 12 repeatedly support the roof, damaging the integrity of the roof coal in the roadway; the rear roof beam 13 of the end frame is equipped with a coal discharge device 6 designed and processed by itself to break the net and discharge coal.

[0067] (2): Control the telescopic cylinder 661 to extend the insert 666 with the serrated groove 662 at an angle toward the top plate, destroy the top plate anchor mesh structure, and then release the top coal by swinging the guard plate 61 up and down and extending and retracting the insert plate back and forth.

[0068] (3): After the coal is discharged, the coal discharge device 6 and the top beam 1 of the end frame are adjusted to the initial state to prevent the gangue on the roof from falling further, so as to achieve the purpose of controllable coal discharge at the end.

[0069] (4): After the top coal is discharged from the roadway, it falls directly into the transfer machine channel and is transported out by the transfer machine and belt conveyor.

[0070] It should be noted that the transfer machine and belt conveyor are existing technologies and will not be described in detail here; in addition, the roof plate mentioned in the text is the baffle plate at the top of the roadway, which is used to prevent the coal at the top of the roadway from falling accidentally.

[0071] In addition, the scope of anchor removal includes the roof anchor beams, non-pedestrian side steel strips, and anchor cables. The number of anchor removal rows is dynamically coordinated based on the coal cutting progress and roof support status at the working face to avoid premature roof breakage due to premature anchor removal or difficulty in releasing top coal due to delayed anchor removal.

[0072] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A coal discharge device (6) at the end of a frame, comprising two symmetrically distributed top beams (1) and a base (2) located below the top beams (1), characterized in that: The front beam (3) and the shield beam (4) are respectively provided on the front and rear sides of the top beam (1). The top beam (1) and the base (2) are connected by a telescopic column (5). The top beam (1) includes a front top beam (11), a middle top beam (12) and a rear top beam (13) distributed sequentially along the straight direction of the roadway. The front top beam (11), the middle top beam (12) and the rear top beam (13) are all box-shaped structural components. The base (2) includes a front base (21), a middle base (22) and a rear base (23) arranged sequentially along the straight direction of the roadway, which correspond one-to-one with the front top beam (11), the middle top beam (12) and the rear top beam (13). The column (5) includes a front column (51), a middle column (52) and a rear column (53), and a base connecting rod (24) is hinged between the front column (51) and the middle column (52) and between the middle column (52) and the rear column (53). A front column (51) connects the front top beam (11) and the front base (21), a rear column (53) connects the rear top beam (13) and the rear base (23), and two middle columns (52) connect the middle top beam (12) and the middle base (22). The shield beam (4) is rotatably mounted on the side of the rear top beam (13) away from the middle top beam (12) by means of ear seat and pin shaft. A coal discharge device (6) is provided on the side of the shield beam (4) facing the rear top beam (13), and the coal discharge device (6) is located at the position of the roof protection structure removed on the rear top beam (13). The protective beam (4) and the rear base (23) are supported and connected by a connecting rod assembly (7); a front beam jack (31) is connected between the front beam (3) and the front top beam (11). The coal discharge device (6) includes a protective plate (61) on the side of the shield beam (4) facing the rear top beam (13). The side of the protective plate (61) facing the shield beam (4) is connected to the protective plate base (62) on the shield beam (4) by a pin. The protective plate (61) and the shield beam (4) are connected by a swing cylinder (63). The two ends of the swing cylinder (63) are respectively rotatably installed on the first fixed seat (64) at the bottom of the protective plate (61) and the second fixed seat (65) at the bottom of the shield beam (4). The protective plate (61) is provided with a coal discharge assembly (66) for further breaking the mesh and discharging coal. The coal discharge assembly (66) includes a telescopic cylinder (661) installed at the lower end of the guard plate (61). The guard plate (61) has a groove (662) at one end away from the shield beam (4). A telescopic circular hole (663) is provided at the bottom of the groove (662). An extension rod (664) is slidably arranged in the telescopic circular hole (663). A linkage block (665) is installed at the output end of the telescopic cylinder (661). The extension rod (664) passes through the linkage block (665) and is rotatably installed on the linkage block (665). A skewer plug (666) is provided on the side of the extension rod (664) away from the guard plate (61). The telescopic circular hole (663) is provided with a spiral groove (6631), and the side wall of the extension rod (664) away from the shaving plug (666) is provided with a matching rod (6641) that slides in the spiral groove (6631); the shaving plug (666) has a structure in which the diameter gradually decreases from the middle to both sides, and the side wall of the shaving plug (666) is provided with a number of serrated grooves (6661) evenly distributed around the periphery.

2. The end-frame coal discharge device (6) according to claim 1, characterized in that: The linkage assembly (7) includes a front linkage (71) and a rear linkage (72). The rear base (23) is provided with a rod placement frame (73) at one end away from the base connecting rod (24). The rod placement frame (73) is inclined from top to bottom on the side away from the rear base (23), and a first rotating shaft (74) is inserted into the rod placement frame (73) along its inclined plane. The front linkage (71) is rotatably mounted on the first rotating shaft (74) at the front end of the rod placement frame (73), and the rear linkage (72) is rotatably mounted on the first rotating shaft (74) at the rear end of the rod placement frame (73). The lower surface of the shield beam (4) is also provided with two second rotating shafts (75) that correspond one-to-one with the first rotating shaft (74). The upper end of the front linkage (71) is rotatably mounted on the second rotating shaft (75) at the front end of the shield beam (4), and the upper end of the rear linkage (72) is rotatably mounted on the second rotating shaft (75) at the rear end of the shield beam (4). Protective plates (41) are provided on the opposite outer walls of the two protective beams (4) to further expand the protection range.

3. The end-frame coal discharge device (6) according to claim 1, characterized in that: The outer walls of the front top beam (11), middle top beam (12) and rear top beam (13) are all equipped with outer top plates (80). Multiple outer mounting blocks (81) are installed on the side walls of the outer top plates (80). The outer mounting blocks (81) are rotatably mounted on the first card seat (82) set on the outer wall of the front top beam (11), middle top beam (12) or rear top beam (13) by means of pin shafts. An outer top jack (83) is hinged between the outer top plates (80) and the outer walls of the front top beam (11), middle top beam (12) or rear top beam (13). The inner walls of the front top beam (11), middle top beam (12) and rear top beam (13) are all equipped with inner top plates (84). Multiple inner mounting blocks (85) are installed on the side walls of the inner top plates (84). The inner mounting blocks (85) are rotatably mounted on the second bracket (86) provided on the inner wall of the front top beam (11), middle top beam (12) or rear top beam (13) by means of pins. An inner top jack (87) is hinged between the inner top plates (84) and the outer walls of the front top beam (11), middle top beam (12) or rear top beam (13). A secondary protective plate (88) is connected to the lower end of the outer protective plate (80) of the top beam located on the rear top beam (13).

4. The end-frame coal discharge device (6) according to claim 1, characterized in that: The front base (21) is provided with a first connecting ear (211), and a lower swing rod (212) is rotatably mounted on the first connecting ear (211) via a pin. The upper end of the lower swing rod (212) is rotatably connected to an upper swing rod (213) via a pin. The lower end of the front top beam (11) is provided with a second connecting ear (214), and the upper end of the upper swing rod (213) is also rotatably mounted on the second connecting ear (214) via a pin. The connection between the upper swing rod (213) and the lower swing rod (212) is inclined in the direction away from the shield beam (4).

5. The end-frame coal discharge device (6) according to claim 1, characterized in that: The lower ends of the front top beam (11), the middle top beam (12) and the rear top beam (13) are all provided with adjustment brackets (14), and end connectors (15) are installed on the adjustment brackets (14). Adjustment jacks (16) are connected between the two end connectors (15) along the width direction of the top beam (1) to change the distance between the two top beams (1). There is one adjustment jack (16) located below the front top beam (11) and the rear top beam (13), and there are two adjustment jacks (16) located below the middle top beam (12).

Images