Coal mine underground telescopic auxiliary tail device and tunneling working face transportation system

Abstract

The application provides a coal mine underground telescopic auxiliary machine tail device and a tunneling working face transportation system, and belongs to the technical field of coal mine underground roadway tunneling working face transportation. The coal mine underground telescopic auxiliary machine tail device is installed behind a self-moving machine tail, advances with the self-moving machine tail, can extend the lap joint stroke between the self-moving machine tail and a belt conveyor, reduces the installation frequency of a belt support, improves the footage efficiency, can adjust the length according to the tunneling footage, meets different process requirements, and based on the coal mine underground telescopic auxiliary machine tail device, a tunneling working face transportation system is further provided, so that the starting rate of tunneling and anchoring protection equipment is greatly improved, and the overall tunneling efficiency of the roadway is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of transportation in underground roadway excavation faces of coal mines, and specifically discloses an underground telescopic auxiliary tail device and a transportation system for excavation faces of coal mines. Background Technology

[0002] Coal mine roadway excavation is a crucial factor restricting the orderly continuity of coal mining. Effectively improving roadway excavation efficiency is key to solving the problem of coal mine mining continuity. Currently, integrated mechanized roadway excavation in coal mines mostly adopts rapid excavation systems, among which roadheader, anchor support and transfer crusher, self-propelled tail conveyor, and belt conveyor are the main rapid excavation equipment. To a certain extent, this forms a parallel excavation method of excavation, support, and transportation, thereby achieving the goal of rapid excavation. However, in the roadway excavation process, the transportation system using self-propelled tail conveyor and belt conveyor with connecting trolleys for transfer usually cannot meet the excavation footage of a single shift underground. Furthermore, the operation still suffers from problems such as numerous belt conveyor installations, cumbersome processes, and high personnel risks. Moreover, when installing belt conveyors, all equipment in the roadway system must be stopped and installed manually, which significantly restricts the efficiency of the excavation footage. Summary of the Invention

[0003] This invention provides a telescopic auxiliary tailstock device for underground coal mines, installed after a self-propelled tailstock. As the self-propelled tailstock advances, it extends the overlap stroke between the self-propelled tailstock and the belt conveyor, reducing the number of belt conveyor installations and improving the advance efficiency. Furthermore, its length can be adjusted according to the advance depth to meet different process requirements. Based on this telescopic auxiliary tailstock device, a tunneling face transportation system is also proposed, significantly increasing the uptime of tunneling and anchoring equipment and improving the overall tunneling efficiency.

[0004] The aforementioned retractable auxiliary tailstock device for underground coal mines includes a connecting chain, a waste rock discharge track, a support track, a fixed frame, an intermediate frame, a scissor-type telescopic assembly, an anchor frame I, an anchor frame II, a push-pull rod, and a pushing cylinder. The rear end of the connecting chain is connected to the waste rock discharge track, and the front end is used to connect to the self-propelled tailstock. The front end of the waste rock discharge track is provided with a wedge-shaped waste rock discharge structure, and the rear end is connected to the front end of the support track. The fixed frame includes two vertical beams I, a horizontal beam I connecting the two vertical beams I, and rollers mounted on the fixed frame between the two vertical beams I. The fixed frame includes lower rollers and two vertical beams I fixed on the waste rock discharge track; the intermediate frame includes two vertical beams II, a crossbeam II connecting the two vertical beams II, traveling wheels installed at the bottom of the vertical beams II, and upper and lower rollers installed between the two vertical beams II. The intermediate frame straddles the support track via the traveling wheels; multiple sets of intermediate frames straddle the support track sequentially from front to back, with adjacent sets of intermediate frames connected by scissor-type telescopic components, and the foremost intermediate frame connected to the fixed frame by a scissor-type telescopic component; anchoring. Frame I and Anchor Frame II are located after the intermediate frame, and both include T-shaped legs, upper anchor rollers, lower anchor rollers, T-shaped top beams, support sleeves, roof connection components, and roof support cylinders. The longitudinal beams of the T-shaped legs are used to support the roadway floor and are parallel to the support rails. The longitudinal beams of the two T-shaped legs are slidably connected to both sides of the support rails. The upper and lower anchor rollers are installed between the vertical beams of the two T-shaped legs. The T-shaped top beam is located above the upper and lower anchor rollers, and its two ends are connected to the two... The vertical beams of the T-shaped support legs are connected, and the vertical beams are hollow structures; the support sleeve is slidably sleeved with the vertical beams of the T-shaped top beam; the top connection assembly includes a top connection plate fixed to the top of the support sleeve and a tapered nail set on the top connection plate; the support cylinder is installed in the space enclosed by the support sleeve and the vertical beams of the T-shaped top beam, with its top end connected to the support sleeve and its bottom end connected to the T-shaped top beam; the two ends of the push-pull rod are respectively connected to the anchor frame I and the rear intermediate frame through pins; the two ends of the push cylinder are respectively connected to the anchor frame I and the anchor frame II through pins.

[0005] Furthermore, a groove is provided on the outer side of the support rail, and a slide rail that mates with the groove is provided on the longitudinal beam of the T-shaped support leg.

[0006] Furthermore, the scissor-type telescopic assembly includes two sets of V-shaped hinges and at least one set of X-shaped hinges connecting the two sets of V-shaped hinges.

[0007] Furthermore, the idlers on the fixed frame, the idlers on the intermediate frame, and the idlers on the anchor frame are all trough-type idlers, while the idlers on the fixed frame, the idlers on the intermediate frame, and the idlers on the anchor frame are all flat idlers.

[0008] Furthermore, grooved roller mounting ears are provided on the crossbeam I of the fixed frame and the crossbeam II of the intermediate frame; a crossbeam III is installed between the two vertical beams of the T-shaped support leg, and grooved roller mounting ears are provided on the crossbeam III; flat roller mounting ears are provided on the vertical beam I of the fixed frame, the vertical beam II of the intermediate frame, and the vertical beam of the T-shaped support leg.

[0009] Furthermore, the fixing frame also includes a connecting seat; the connecting seat includes a right-angle plate, an arc-shaped plate, a lower sealing plate, an upper sealing plate, and a side sealing plate; the right-angle plate includes a horizontal plate and a vertical plate, the opening formed by the horizontal plate and the vertical plate faces the outside of the waste rock disposal track; the arc-shaped plate is located inside the opening of the right-angle plate; the lower sealing plate connects the lower edges of the right-angle plate and the arc-shaped plate, and its longitudinal end and transverse end are aligned with the right-angle plate and the arc-shaped plate; the upper sealing plate connects the upper edges of the right-angle plate and the arc-shaped plate, its longitudinal end is aligned with the right-angle plate and the arc-shaped plate, and its transverse end forms a slot with the right-angle plate, the arc-shaped plate, and the lower sealing plate; the side sealing plate connects the longitudinal ends of the right-angle plate, the arc-shaped plate, the lower sealing plate, and the upper sealing plate; the bottom end of the vertical beam I is inserted into the slot and fixed; the scissor-type telescopic assembly passes through the clearance groove formed by the arc-shaped plate and connects to the vertical beam I; the lower sealing plate is fixed on the waste rock disposal track.

[0010] Furthermore, the traveling wheels include a top traveling wheel located at the top of the support rail and a side traveling wheel located in the slide groove of the support rail; the intermediate frame also includes a T-shaped mounting frame; the transverse frame of the T-shaped mounting frame is inserted into and fixed to the vertical beam II of the intermediate frame, and the top traveling wheel and the side traveling wheel are installed on the longitudinal frame.

[0011] Furthermore, the longitudinal beams of the T-shaped support legs are provided with mounting slots for the push cylinders.

[0012] Furthermore, the support track includes multiple sets of sub-tracks connected by pins.

[0013] The aforementioned tunneling face transportation system includes an anchor-support transfer crusher, a self-propelled tail section installed after the anchor-support transfer crusher, and the aforementioned underground retractable auxiliary tail section device in coal mines, with the front end of the connecting chain connected to the self-propelled tail section.

[0014] The present invention has the following beneficial effects:

[0015] The retractable auxiliary tail section device in coal mines provides a retractable body for the self-propelled tail section, enabling continuous single-shift transport during tunneling operations. It can extend the overlap stroke between the self-propelled tail section and the belt conveyor, reduce the number of belt frame installations, improve the advance efficiency, and adjust its length according to the tunneling advance to meet different process requirements. By adapting to the stable push-pull forward movement method in variable slope roadways, it extends the belt and improves the efficiency of tunneling operations. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a retractable auxiliary tail section device in an underground coal mine.

[0018] Figure 2 This is a schematic diagram of the waste rock disposal track.

[0019] Figure 3 This is a schematic diagram showing the connection between adjacent sub-tracks;

[0020] Figure 4 This is a schematic diagram of the fixed frame structure;

[0021] Figure 5 This is a schematic diagram of the connector structure;

[0022] Figure 6 This is a schematic diagram of the intermediate frame structure;

[0023] Figure 7 A structural diagram of the traveling wheel and T-shaped mounting bracket;

[0024] Figure 8 A schematic diagram of a scissor-type telescopic assembly;

[0025] Figure 9 This is a schematic diagram of the anchorage frame.

[0026] Figure 10 This is a schematic diagram of the transportation system at the tunneling face.

[0027] In the diagram: 100 anchored transfer crusher; 200 self-moving tail section; 300 telescopic auxiliary tail section device for underground coal mines; 301 connecting chain; 302 waste rock removal track; 302.1 wedge-shaped waste rock removal structure; 303 supporting track; 303 sub-track; 304 fixed frame; 304.1 vertical beam I; 304.2 horizontal beam I; 304.3 connecting seat; 304.3 right-angle plate; 304.3.1 arc-shaped plate; 304.3.2 lower sealing plate; 304.3.3 upper sealing plate; 304.3.4 side sealing plate; 304.3.5 intermediate frame; 305 vertical beam II; 305.2 horizontal beam II; 305.3 traveling wheel; 305.3 top traveling wheel; 305.3.1 side traveling wheel; 305.3.2. Intermediate frame upper idler 305.4; intermediate frame lower idler 305.5; T-shaped mounting frame 305.6; scissor-type telescopic assembly 306; V-shaped hinge rod 306.1; X-shaped hinge rod 306.2; anchor frame I 307a; anchor frame II 307b; T-shaped support leg 307.1; anchor frame upper idler 307.2; anchor frame lower idler 307.3; T-shaped top beam 307.4; support sleeve 307.5; slide rail 307.6; top plate 307.7; tapered nail 307.8; push-pull rod 308; crossbeam III 307.9; push cylinder mounting groove 307.10; push cylinder 309; horizontal pull rail 310; trough idler mounting ear plate 311; flat idler mounting ear plate 312. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the embodiments, the length direction of the support rail 303 is longitudinal, the width direction is transverse, and the direction perpendicular to the support rail 303 is vertical.

[0029] Example 1

[0030] This embodiment provides a telescopic auxiliary tail device 300 for underground coal mines, including a connecting chain 301, a waste rock discharge track 302, a support track 303, a fixing frame 304, an intermediate frame 305, a scissor-type telescopic component 306, an anchor frame I 307a, an anchor frame II 307b, a push-pull rod 308, and a push-moving cylinder 309.

[0031] The rear end of the connecting chain 301 is connected to the connecting ear of the waste rock discharge track 302 via a pin, and the front end is connected to the self-moving tail 200 via a pin.

[0032] The front end of the waste rock discharge track 302 is equipped with a wedge-shaped waste rock discharge structure 302.1, which is used to remove loose coal and level the roadway floor. The rear end is connected to the front end of the support track 303 through a horizontal pull track 310.

[0033] The support track 303 includes multiple sets of sub-tracks 303.1 connected by pins to adapt to changes in the roadway slope. A chute is provided on the outer side of the support track 303.

[0034] The fixed frame 304 includes two vertical beams I 304.1, a horizontal beam I 304.2 connecting the two vertical beams I 304.1, an upper roller and a lower roller installed between the two vertical beams I 304.1, and a connecting seat 304.3. The connecting seat 304.3 includes a right-angle plate 304.3.1, an arc-shaped plate 304.3.2, a lower sealing plate 304.3.3, an upper sealing plate 304.3.4, and a side sealing plate 304.3.5. The right-angle plate 304.3.1 includes a horizontal plate and a vertical plate, with the opening formed by the horizontal and vertical plates facing outwards from the waste rock discharge track 302. The arc-shaped plate 304.3.2 is located within the opening of the right-angle plate 304.3.1. The lower sealing plate 304.3.3 connects the lower edges of the right-angle plate 304.3.1 and the arc-shaped plate 304.3.2, with both its longitudinal and transverse ends aligned with the right-angle plate 304.3.1 and the arc-shaped plate 304.3.2. The upper sealing plate 304.3.4 connects the right-angle plate 304.3.1 and... The upper edge of the curved plate 304.3.2 has its longitudinal end aligned with the right-angle plate 304.3.1 and the curved plate 304.3.2, and its transverse end forming a slot with the right-angle plate 304.3.1, the curved plate 304.3.2, and the lower sealing plate 304.3.3; the side sealing plate 304.3.5 connects the longitudinal ends of the right-angle plate 304.3.1, the curved plate 304.3.2, the lower sealing plate 304.3.3, and the upper sealing plate 304.3.4; the bottom end of the vertical beam I 304.1 is inserted into the slot and fixed; the scissor-type telescopic component 306 passes through the clearance groove formed by the curved plate 304.3.2 and connects to the vertical beam I 304.1; the lower sealing plate 304.3.3 is fixed on the waste rock discharge track 302.

[0035] The intermediate frame 305 includes two vertical beams II 305.1, a crossbeam II 305.2 connecting the two vertical beams II 305.1, a traveling wheel 305.3 installed at the bottom of the vertical beams II 305.1, and an upper roller 305.4 and a lower roller 305.5 installed between the two vertical beams II 305.1. The intermediate frame 305 straddles the support rail 303 via the traveling wheel 305.3. Multiple sets of intermediate frames 305 straddle the support rail 303 sequentially from front to back. Adjacent sets of intermediate frames 305 are connected by a scissor-type telescopic component 306 and a pin. The foremost intermediate frame is connected to the fixed frame 304 by a scissor-type telescopic component 306 and a pin, so that the distance between the intermediate frames 305 is adjustable to ensure transportation needs and adapt to the undulations of the tunnel floor.

[0036] Furthermore, the traveling wheel 305.3 includes a top traveling wheel 305.3.1 located at the top of the support rail 303 and a side traveling wheel 305.3.2 located in the groove of the support rail 303; the intermediate frame 305 also includes a T-shaped mounting frame 305.6; the transverse frame of the T-shaped mounting frame 305.6 is inserted and fixed to the vertical beam II 305.1 of the intermediate frame 305, and the longitudinal frame is used to install the top traveling wheel 305.3.1 and the side traveling wheel 305.3.2.

[0037] Anchor frames I 307a and II 307b are located after the intermediate frame 305. Both include T-shaped legs 307.1, upper anchor rollers 307.2 and lower anchor rollers 307.3, a T-shaped top beam 307.4, a support sleeve 307.5, a roof-connecting assembly, and a roof-supporting cylinder. The longitudinal beam of the T-shaped leg 307.1 is used to support the roadway floor and is parallel to the support rail 303. A slide rail 307.6, which mates with a chute, is installed on the longitudinal beam to achieve a sliding connection between the T-shaped leg 307.1 and the support rail 303, ensuring relative stability between the anchor frame and the support rail 303. The upper anchor roller 307.2 and lower anchor roller 307.3 are installed between the vertical beams of the two T-shaped legs 307.1. The T-shaped top beam 307.4 is located at the anchor... Above the upper idler roller 307.2 of the fixed frame and the lower idler roller 307.3 of the anchor frame, both ends of the crossbeam are connected to the vertical beams of the two T-shaped support legs 307.1, respectively. The vertical beams are hollow structures. The support sleeve 307.5 is slidably sleeved with the vertical beam of the T-shaped top beam 307.4. The roof support assembly includes a roof support plate 307.7 fixed to the top of the support sleeve 307.5 and a tapered nail 307.8 set on the roof support plate 307.7 to ensure that there is no relative sliding with the roadway roof during support. The support cylinder is installed in the space enclosed by the vertical beams of the support sleeve 307.5 and the T-shaped top beam 307.4. The top end is connected to the support sleeve 307.5 by a pin, and the bottom end is connected to the T-shaped top beam 307.4 by a pin so that the roof support assembly can adapt to the unevenness of the roadway roof.

[0038] The two ends of the push-pull rod 308 are connected to the anchor frame I 307a and the rear intermediate frame respectively via pins.

[0039] The two ends of the push cylinder 309 are connected to the anchor frame I 307a and the anchor frame II 307b respectively via pins.

[0040] Furthermore, the scissor-type telescopic assembly 306 includes two sets of V-shaped hinge rods 306.1 and at least one set of X-shaped hinge rods 306.2 connecting the two sets of V-shaped hinge rods 306.1. The V-shaped hinge rods 306.1 are hinged to the fixed frame 304 and the intermediate frame 305 through hinge pins, and the X-shaped hinge rods 306.2 are hinged to the V-shaped hinge rods 306.1 through hinge pins.

[0041] Furthermore, the upper idler rollers of the fixed frame, the upper idler rollers of the intermediate frame 305.4 and the upper idler rollers of the anchor frame 307.2 are all trough-type idler rollers, while the lower idler rollers of the fixed frame, the lower idler rollers of the intermediate frame 305.5 and the lower idler rollers of the anchor frame 307.3 are all flat idler rollers.

[0042] Furthermore, grooved roller mounting ears 311 are provided on the crossbeam I 304.2 of the fixed frame 304 and the crossbeam II 305.2 of the intermediate frame 305; a crossbeam III 307.9 is installed between the two vertical beams of the T-shaped support leg 307.1, and grooved roller mounting ears 311 are provided on the crossbeam III 307.9; flat roller mounting ears 312 are provided on the vertical beam I 304.1 of the fixed frame 304, the vertical beam II 305.1 of the intermediate frame 305, and the vertical beam of the T-shaped support leg 307.1.

[0043] Furthermore, the longitudinal beam of the T-shaped support leg 307.1 is provided with a push cylinder mounting groove 307.10.

[0044] Example 2

[0045] This embodiment provides a tunneling face transportation system, including an anchor-support transfer crusher 100, a self-propelled tail liner 200 installed after the anchor-support transfer crusher 100, and the aforementioned underground retractable auxiliary tail liner device 300. The front end of the connecting chain 301 is connected to the self-propelled tail liner 200. The self-propelled tail liner 200 is a stepping self-propelled tail liner.

[0046] The working process of the above-mentioned tunneling face transportation system is as follows:

[0047] The self-moving tail section 200 moves forward with the equipment in front, and is pulled forward by the connecting chain 301 to the waste rock disposal track 302, support track 303, fixed frame 304, and intermediate frame 305. The support track 303 is extended, and the intermediate frame 305 slides on the support track 380 through the wheel assembly 335. The scissor telescopic assembly 306 extends, and the conveying distance of the underground telescopic auxiliary tail section device 300 is extended. The middle support cylinder of the anchor frame I 307a extends and supports the roadway roof by connecting the roof plate 307.7. The pushing cylinder 309 retracts, causing the anchor frame II 307b to move forward.

[0048] When the self-moving tail section 200 stops, the middle support cylinder of the anchor frame II 307b extends, connecting to the roof plate 307.7 to support the roadway roof. The push cylinder 309 extends, causing the anchor frame I 307a to move forward. The push-pull rod 308 pushes the middle frame 305 forward, and the scissor-type telescopic component 306 retracts to its shortest distance. The underground telescopic auxiliary tail section device 300 maintains its shortest stroke so that it can move forward with the self-moving tail section 200.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic auxiliary tail device for underground coal mines, characterized in that, Includes connecting chain, waste rock discharge track, support track, fixing frame, intermediate frame, scissor-type telescopic assembly, anchor frame I, anchor frame II, push-pull rod and push-moving cylinder; The rear end of the connecting chain is connected to the waste rock disposal track, and the front end is used to connect to the tail of the self-propelled machine. The front end of the waste rock disposal track is provided with a wedge-shaped waste rock disposal structure, and the rear end is connected to the front end of the support track. The fixed frame includes two vertical beams I, a horizontal beam I connecting the two vertical beams I, and upper rollers and lower rollers of the fixed frame installed between the two vertical beams I. The two vertical beams I are fixed on the waste rock discharge track. The intermediate frame includes two vertical beams II, a horizontal beam II connecting the two vertical beams II, a traveling wheel installed at the bottom of the vertical beams II, and upper and lower rollers of the intermediate frame installed between the two vertical beams II. The intermediate frame straddles the support rail via the traveling wheel. Multiple intermediate frames straddle the support rails from front to back. Adjacent intermediate frames are connected by scissor-type telescopic components, and the foremost intermediate frame is connected to the fixed frame by a scissor-type telescopic component. The anchor frame I and anchor frame II are located after the intermediate frame, and each includes a T-shaped support leg, an upper support roller of the anchor frame, a lower support roller of the anchor frame, a T-shaped top beam, a support sleeve, a top connection assembly, and a top support cylinder; The longitudinal beams of the T-shaped support legs are used to support the tunnel floor and are parallel to the support rail. The longitudinal beams of the two T-shaped support legs are slidably connected to both sides of the support rail. The upper and lower rollers of the anchor frame are installed between the vertical beams of the two T-shaped legs; The T-shaped top beam is located above the upper roller and lower roller of the anchor frame. The two ends of the crossbeam are connected to the vertical beams of the two T-shaped legs, and the vertical beams are hollow structures. The support sleeve is slidably sleeved with the vertical beam of the T-shaped top beam; The top-mounting assembly includes a top-mounting plate fixed to the top of the support sleeve and a conical nail set on the top-mounting plate; The hydraulic cylinder is installed in the space enclosed by the support sleeve and the vertical beam of the T-shaped top beam, with its top end connected to the support sleeve and its bottom end connected to the T-shaped top beam. The two ends of the push-pull rod are respectively connected to the anchor frame I and the rear intermediate frame via pins; The two ends of the pushing cylinder are connected to anchor frame I and anchor frame II respectively via pins.

2. The retractable auxiliary tail device for underground coal mines according to claim 1, characterized in that, The outer side of the support rail is provided with a sliding groove, and the longitudinal beam of the T-shaped support leg is provided with a sliding rail that cooperates with the sliding groove.

3. The retractable auxiliary tail device for underground coal mines according to claim 2, characterized in that, The scissor-type telescopic assembly includes two sets of V-shaped hinges and at least one set of X-shaped hinges connecting the two sets of V-shaped hinges.

4. The retractable auxiliary tailpiece device for underground coal mines according to claim 3, characterized in that, The idlers on the fixed frame, the intermediate frame, and the anchor frame are all trough-type idlers, while the idlers on the fixed frame, the intermediate frame, and the anchor frame are all flat idlers.

5. The retractable auxiliary tail device for underground coal mines according to claim 4, characterized in that, Grooved roller mounting ears are provided on both the crossbeam I of the fixed frame and the crossbeam II of the intermediate frame; A crossbeam Ⅲ is installed between the two vertical beams of the T-shaped support leg, and a grooved roller mounting ear plate is provided on the crossbeam Ⅲ; Flat roller mounting ears are installed on the vertical beam I of the fixed frame, the vertical beam II of the intermediate frame, and the vertical beam of the T-shaped support leg.

6. The retractable auxiliary tailpiece device for underground coal mines according to claim 5, characterized in that, The mounting bracket also includes a connecting seat; The connector includes a right-angle plate, an arc-shaped plate, a lower sealing plate, an upper sealing plate, and a side sealing plate; The right-angle plate consists of a horizontal plate and a vertical plate, and the opening formed by the horizontal and vertical plates faces the outside of the waste rock discharge track; The curved plate is located inside the opening of the right-angle plate; The lower sealing plate connects the lower edges of the right-angle plate and the curved plate, and its longitudinal and transverse ends are aligned with the right-angle plate and the curved plate. The upper sealing plate connects the upper edges of the right-angle plate and the curved plate, with its longitudinal end aligned with the right-angle plate and the curved plate, and its transverse end forming a slot with the right-angle plate, the curved plate, and the lower sealing plate. The side sealing plate connects the longitudinal ends of the right-angle plate, the curved plate, the lower sealing plate, and the upper sealing plate; The bottom end of vertical beam I is inserted into the slot and fixed. The scissor-type telescopic assembly passes through the clearance groove formed by the arc plate and connects to the vertical beam I; The lower sealing plate is fixed on the waste rock discharge track.

7. The retractable auxiliary tail device for underground coal mines according to claim 6, characterized in that, The traveling wheels include a top traveling wheel located at the top of the support rail and side traveling wheels located in the groove of the support rail; The intermediate frame also includes T-shaped mounting brackets; The transverse frame of the T-shaped mounting bracket is inserted and fixed to the vertical beam II of the middle frame, and the longitudinal frame is equipped with the top travel wheel and the side travel wheel.

8. The retractable auxiliary tailpiece device for underground coal mines according to claim 7, characterized in that, The longitudinal beams of the T-shaped outriggers are equipped with mounting slots for the push cylinders.

9. The retractable auxiliary tail device for underground coal mines according to claim 8, characterized in that, The support track consists of multiple sets of sub-tracks connected by pins.

10. A tunneling face transportation system, comprising an anchor-support transfer crusher and a self-propelled tail section installed after the anchor-support transfer crusher, characterized in that, It also includes the retractable auxiliary tail device for underground coal mines as described in any one of claims 1-9, wherein the front end of the connecting chain is connected to the self-moving tail.

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