Telescopic scraper conveyor tail with coal discharging and returning functions and scraper conveyor

Abstract

The invention provides a scraper conveyor telescopic tail with a coal discharging and returning function and a scraper conveyor, and belongs to the technical field of mining mechanical equipment.The scraper conveyor telescopic tail with the coal discharging and returning function comprises a fixing groove, a telescopic frame, a chain wheel set, a coal returning cover and a coal discharging and returning device; the telescopic frame is slidably connected to the fixing groove, the chain wheel set is arranged at the tail end of the telescopic frame, and the telescopic frame is driven by the telescopic oil cylinder to move on the fixing groove. The coal return cover is arranged at the tail end of the fixing groove, and a coal discharging and feeding port is formed in the bottom of the coal return cover; the returned coal discharging device comprises a returned coal conveying pipeline and a returned coal conveying assembly, one end of the returned coal conveying pipeline is connected with the discharged coal feeding port, the other end of the returned coal conveying pipeline extends to the position above the telescopic frame, and the returned coal conveying assembly is arranged in an included angle area of the joint of the fixing groove and the coal returning cover; the returned coal conveying assembly is used for collecting triangular accumulated coal at the joint of the fixing groove and the coal returning cover and pushing the triangular accumulated coal into the coal discharging feeding port to be discharged into the returned coal conveying pipeline.

Description

Technical Field

[0001] This invention relates to the field of mining machinery and equipment technology, and in particular to a scraper conveyor with a telescopic tail section and a scraper conveyor having a coal return function. Background Technology

[0002] In fully mechanized coal mining faces, scraper conveyors are one of the main pieces of equipment. During operation, their load constantly changes with the coal mining speed of the mining machine and the movement of the supports, causing the scraper chain to loosen or tighten accordingly. The telescopic tail section, as a key component of the scraper conveyor, allows for real-time adjustment of the chain tension, effectively reducing the number of chain-cutting operations required at the working face, saving labor costs, and improving work efficiency.

[0003] The widely used scraper conveyor telescopic tail section mainly consists of a fixed trough and a telescopic frame. The telescopic cylinder is connected to the fixed trough and the telescopic frame at both ends, respectively. By extending and retracting the telescopic cylinder, the telescopic frame is moved relative to the fixed trough, thereby adjusting the length of the tail section.

[0004] During the operation of the scraper conveyor, the coal in the mine is a bulk material, and its viscosity increases after it contains water, making it prone to adhesion. A portion of the coal is not completely unloaded and adheres to the scraper and chain surface, thus being pulled back to the telescopic conveyor tail by the returning scraper chain. However, when the scraper chain turns around the sprocket assembly at the telescopic conveyor tail, it easily "throws" the adhered coal down and throws it into the area below the sprocket assembly at the telescopic conveyor tail. This forms a triangular coal pile at the connection between the fixed trough and the coal return hood at the telescopic conveyor tail. Initially, the triangular coal pile is loose, but as more coal is brought in and repeatedly crushed by the scraper chain, the volume of the coal pile becomes larger and denser, greatly increasing the running resistance of the scraper chain. Once the coal pile becomes severe, the scraper chain will "jam" at the sprocket assembly at the telescopic conveyor tail, generating significant resistance, leading to damage to transmission components such as the motor and reducer, causing equipment shutdown or even malfunction, severely reducing the production efficiency of the coal mine. Summary of the Invention

[0005] In view of this, it is necessary to provide a scraper conveyor with a coal return function to solve the problem of triangular coal accumulation at the connection between the fixed trough and the coal return hood. Once the coal accumulation is serious, the scraper chain will "get stuck" at the sprocket set of the telescopic tail, generating great resistance, which will cause damage to transmission components such as motors and reducers, leading to equipment shutdown or even failure, and seriously reducing the production efficiency of coal mines.

[0006] It is also necessary to provide a scraper conveyor.

[0007] The technical solution adopted by this invention to solve its technical problem is: On the one hand, the present invention provides a telescopic tail of a scraper conveyor with a coal return function, including a fixed trough, a telescopic frame, a sprocket assembly, a coal return hood, and a coal return device; The telescopic frame is slidably connected to the fixed groove, the sprocket assembly is located at the end of the telescopic frame, and the telescopic frame moves on the fixed groove under the drive of the telescopic cylinder, so that the telescopic frame drives the sprocket assembly to pull the scraper chain on it to adjust the chain tension; The coal return hood is located at the end of the fixed trough so that the fixed trough and the coal return hood together form a cavity for collecting coal. The bottom of the coal return hood has a coal discharge inlet, and the coal discharge inlet is located above the connection between the fixed trough and the coal return hood. The coal return device includes a coal return transport pipe and a coal return conveying assembly. One end of the coal return transport pipe is connected to the coal discharge inlet, and the other end extends above the telescopic frame. The coal return conveying assembly is located in the angled area between the fixed trough and the coal return hood. The coal return conveying assembly is used to collect the triangularly accumulated coal at the connection between the fixed trough and the coal return hood and push it into the coal discharge inlet, discharging it into the coal return transport pipe. At the same time, as the coal in the coal return transport pipe gradually accumulates, once the amount of coal in the coal return transport pipe reaches a certain level, it is finally discharged from the other end of the coal return transport pipe onto the surface of the scraper chain on the telescopic frame for re-transportation.

[0008] Preferably, the coal return conveying assembly includes a coal return guide hood, a spiral coal discharge section, and a drive section. The coal return guide hood covers the coal discharge inlet. One end of the spiral coal discharge section is connected to the inner side of the fixed trough away from the coal discharge inlet. The other end of the spiral coal discharge section passes through the coal return guide hood and is connected to the output end of the drive section. The drive section is connected to the fixed trough. The drive section drives the spiral coal discharge section to rotate, so that the spiral coal discharge section pushes the triangularly accumulated coal at the connection between the fixed trough and the coal return hood into the coal return guide hood for collection. At the same time, the spiral coal discharge section pushes the coal return inside the coal return guide hood into the coal discharge inlet and discharges it into the coal return transport pipeline.

[0009] Preferably, the spiral coal discharge section includes a coal discharge rod and spiral blades surrounding its outer circumference. One end of the coal discharge rod is rotatably connected to the inner side of the fixed groove away from the coal discharge inlet, and the other end of the coal discharge rod passes through the coal return guide cover and is connected to the output end of the drive unit. The drive unit drives the coal discharge rod to rotate, and the coal discharge rod drives the spiral blades to rotate, so that the spiral blades spirally feed the accumulated coal.

[0010] Preferably, the pitch of the spiral blades gradually increases from one end near the coal return guide shroud to the other end.

[0011] Preferably, the pitch of the spiral blades increases continuously from one end near the coal return guide shroud to the other end.

[0012] Preferably, the pitch of the spiral blades increases in segments from one end near the coal return guide shroud to the other end.

[0013] Preferably, the drive unit includes a hydraulic motor and a hydraulic control component. The hydraulic motor is detachably mounted on the fixed groove. The output shaft of the hydraulic motor is connected to the spiral coal discharge unit. The hydraulic control component is disposed on one side of the hydraulic motor and connected to the hydraulic motor. The hydraulic control component is used to control the start / stop, speed, and rotation direction of the hydraulic motor.

[0014] Preferably, the vertical cross-section of the coal return transport pipe is "L"-shaped, and the corner of the coal return transport pipe is a rounded transition. The coal return transport pipe is also equipped with a first high-pressure water nozzle and a second high-pressure water nozzle. The first high-pressure water nozzle is located at the bottom of the end of the coal return transport pipe connected to the coal discharge inlet. The scouring direction of the first high-pressure water nozzle is towards the corner of the coal return transport pipe, so that the high-pressure water flow sprayed by the first high-pressure water nozzle pushes the coal return in the coal return transport pipe to the corner of the coal return transport pipe. The second high-pressure water nozzle is located at the corner of the coal return transport pipe. The scouring direction of the second high-pressure water nozzle is towards the coal return transport pipe and extends to the outlet end above the telescopic frame, so that the high-pressure water flow sprayed by the second high-pressure water nozzle assists the coal return in accelerating and turning at the corner of the coal return transport pipe and flowing to the outlet end above the telescopic frame.

[0015] Preferably, the coal return hood also has several atomizing nozzles.

[0016] On the other hand, the present invention also provides a scraper conveyor, which includes the telescopic tail of the scraper conveyor with coal return function as described in the previous aspect.

[0017] As can be seen from the above technical solution, the present invention provides a scraper conveyor telescopic tail with a coal return function and a scraper conveyor, wherein the scraper conveyor telescopic tail with a coal return function includes a fixed trough, a telescopic frame, a sprocket assembly, a coal return hood, and a coal return device; the telescopic frame is slidably connected to the fixed trough, the sprocket assembly is located at the end of the telescopic frame, and the telescopic frame moves on the fixed trough under the drive of the telescopic cylinder, so that the telescopic frame drives the sprocket assembly to pull the scraper chain on it to adjust the chain tension; the coal return hood is located at the end of the fixed trough, so that the fixed trough and the coal return hood together form a cavity for collecting coal return, and a coal discharge inlet is opened at the bottom of the coal return hood, and the coal discharge inlet is located above the connection between the fixed trough and the coal return hood; the coal return device includes a coal return transport pipe and a coal return transport assembly, the coal return transport pipe One end of the pipeline is connected to the coal discharge inlet, and the other end of the return coal transport pipeline extends to the top of the telescopic frame. The return coal conveying component is set in the angled area between the fixed trough and the return coal cover. The return coal conveying component is used to collect the triangularly accumulated coal at the connection between the fixed trough and the return coal cover and push it into the coal discharge inlet, and discharge it into the return coal transport pipeline. At the same time, as the return coal in the return coal transport pipeline gradually accumulates, after the return coal in the return coal transport pipeline reaches a certain amount, it is finally discharged from the other end of the return coal transport pipeline onto the surface of the scraper chain on the telescopic frame for re-transport. This prevents the triangularly accumulated coal at the connection between the fixed trough and the return coal cover from gradually increasing, thereby avoiding the scraper chain from "jamming" at the tail sprocket of the telescopic machine, which would generate great resistance, damage the transmission components, or cause the equipment to stop. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the telescopic tail of a scraper conveyor with coal return function provided by the present invention.

[0020] Figure 2 This is a partial structural schematic diagram of the coal return device in this invention.

[0021] Figure 3 This is an isometric view of the telescopic tail section of the scraper conveyor with coal return function provided by the present invention.

[0022] In the figure: a scraper conveyor with coal return function, telescopic tail 10, fixed trough 110, telescopic frame 120, sprocket assembly 130, coal return hood 140, coal discharge inlet 141, atomizing nozzle 142, coal return device 150, coal return transport pipeline 151, first high-pressure water nozzle 1511, second high-pressure water nozzle 1512, coal return conveying assembly 152, coal return guide cover 1521, spiral coal discharge section 1522, coal discharge rod 15221, spiral blade 15222, drive section 1523, hydraulic motor 15231, and hydraulic control component 15232. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0024] In the description of this invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] Please refer to Figures 1 to 3 On the one hand, the present invention provides a scraper conveyor telescopic tail 10 with coal return function, including a fixed trough 110, a telescopic frame 120, a sprocket group 130, a coal return hood 140 and a coal return device 150. The telescopic frame 120 is slidably connected to the fixed groove 110, and the sprocket set 130 is located at the end of the telescopic frame 120. The telescopic frame 120 moves on the fixed groove 110 under the drive of the telescopic cylinder, so that the telescopic frame 120 drives the sprocket set 130 to pull the scraper chain on it to adjust the chain tension. The coal return hood 140 is set at the end of the fixed trough 110 so that the fixed trough 110 and the coal return hood 140 together form a cavity for collecting coal return. The bottom of the coal return hood 140 is provided with a coal discharge inlet 141, and the coal discharge inlet 141 is located above the connection between the fixed trough 110 and the coal return hood 140. The coal return device 150 includes a coal return transport pipe 151 and a coal return conveying assembly 152. One end of the coal return transport pipe 151 is connected to the coal discharge inlet 141, and the other end extends above the telescopic frame 120. The coal return conveying assembly 152 is located in the angled area between the fixed trough 110 and the coal return hood 140. The coal return conveying assembly 152 is used to collect the triangularly accumulated coal at the connection between the fixed trough 110 and the coal return hood 140 and push it into the coal discharge inlet 141, discharging it towards the coal return transport pipe 151. Within 1, as the coal in the return coal transport pipeline 151 gradually accumulates, once the coal in the return coal transport pipeline 151 reaches a certain amount, it is naturally squeezed and finally discharged from the other end of the return coal transport pipeline 151 onto the surface of the scraper chain on the telescopic frame 120 for re-transportation. This prevents the triangular accumulation of coal at the connection between the fixed trough 110 and the return coal cover 140 from gradually increasing, thereby avoiding the scraper chain from "getting stuck" at the tail sprocket assembly of the telescopic machine, which would generate great resistance, damage the transmission components, or cause the equipment to stop.

[0026] In this invention, "the telescopic frame 120 is slidably connected to the fixed groove 110, the sprocket set 130 is set at the end of the telescopic frame 120, and the telescopic frame 120 moves on the fixed groove 110 under the drive of the telescopic cylinder, so that the telescopic frame 120 drives the sprocket set 130 to pull the scraper chain on it to adjust the chain tension" is existing technology and will not be described in detail here.

[0027] Furthermore, the coal return conveying assembly 152 includes a coal return guide cover 1521, a spiral coal discharge section 1522, and a drive section 1523. The coal return guide cover 1521 covers the coal discharge inlet 141 to prevent coal accumulation at the coal discharge inlet 141 from causing blockage. One end of the spiral coal discharge section 1522 is connected to the inner side of the fixed groove 110 away from the coal discharge inlet 141, and the other end of the spiral coal discharge section 1522 passes through the coal return guide cover 1521 and is connected to the output end of the drive section 1523. The drive section 1523 is connected to the fixed groove 110. The spiral coal discharge section 1522 is driven to rotate, so that it pushes the triangularly piled coal at the connection between the fixed trough 110 and the return coal hood 140 into the return coal guide hood 1521 for collection. At the same time, the spiral coal discharge section 1522 pushes the return coal in the return coal guide hood 1521 into the coal discharge inlet 141 and discharges it into the return coal transport pipe 151. The return coal guide hood 1521 is a channel for coal collection and guidance. The return coal guide hood 1521 concentrates the return coal collected by the spiral coal discharge section 1522 and guides it to flow to the coal discharge inlet 141, thereby improving the efficiency of coal return discharge.

[0028] Furthermore, the spiral coal discharge section 1522 includes a coal discharge rod 15221 and spiral blades 15222 surrounding its outer circumference. One end of the coal discharge rod 15221 is rotatably connected to the inner side of the fixed groove 110 away from the coal discharge inlet 141. The other end of the coal discharge rod 15221 passes through the coal return guide cover 1521 and is connected to the output end of the drive unit 1523. The drive unit 1523 drives the coal discharge rod 15221 to rotate, which in turn drives the spiral blades 15222 to rotate, so that the spiral blades 15222 spirally feed the accumulated coal. The rotating spiral blades 15222 and the accumulated coal generate a strong mechanical force. Mechanical shearing force and axial thrust can crush and transport compacted or even caked coal, making the coal particle size suitable for passing through the coal return guide hood 1521 and the coal return transport pipe 151. At the same time, the inlet of the coal return guide hood 1521 can hold larger coal particles into the coal return transport pipe 151 for screening. The holding action at the inlet of the coal return guide hood 1521, combined with the propulsion action of the spiral blades 15222, further crushes the coal particles that cannot enter the inlet of the coal return guide hood 1521 until they are conveyed into the coal return guide hood 1521 by the spiral blades 15222.

[0029] Furthermore, the pitch of the spiral blade 15222 gradually increases from one end near the coal return guide shroud 1521 to the other end. On the one hand, this ensures that the other end of the spiral blade 15222 with a large pitch, as the feed end, has enough space to quickly swallow a large amount of loose coal. On the other hand, it ensures that the end of the spiral blade 15222 with a small pitch, as the discharge end, has a large compressive force to prevent blockage at the coal discharge inlet 141. At the same time, the gradual decrease in the pitch of the spiral blade 15222 from the feed end to the discharge end will form a natural transition compression zone. During the conveying process from the feed end to the discharge end, the coal will be gradually compressed from loose to dense.

[0030] In a preferred embodiment, the pitch of the spiral blade 15222 increases continuously from one end near the coal return guide cover 1521 to the other end, so that the compressive force of the spiral blade 15222 on the accumulated coal gradually and uniformly increases, thereby extending the service life of the spiral blade 15222.

[0031] In a preferred embodiment, the pitch of the spiral blade 15222 increases segmentally from one end near the coal return guide shroud 1521 to the other end, thereby dividing the spiral blade 15222 into functionally distinct sections along the axial direction. For example, the spiral blade 15222 can be sequentially divided into a high-pressure compression section, a stable conveying section, and a rapid feeding section from one end near the coal return guide shroud 1521 to the other end along the axial direction. Specific functions are achieved by matching the most suitable pitch parameters for the high-pressure compression section, the stable conveying section, and the rapid feeding section. The high-pressure compression section uses the minimum pitch to generate a strong extrusion force at the discharge end of the spiral blade 15222, ensuring that the accumulated coal is smoothly discharged into the coal return transport pipe 151. The stable conveying section uses a medium pitch to ensure stable conveying of the accumulated coal and reduce the risk of the accumulated coal falling out of the spiral blade 15222. The rapid feeding section uses the maximum pitch to provide the maximum capacity and conveying speed, quickly swallowing loose accumulated coal and preventing severe coal accumulation.

[0032] Furthermore, the drive unit 1523 includes a hydraulic motor 15231 and a hydraulic control component 15232. The hydraulic motor 15231 is detachably mounted on the fixing groove 110 via a flange. The output shaft of the hydraulic motor 15231 is connected to the spiral coal discharge unit 1522. Specifically, the output shaft of the hydraulic motor 15231 is connected to the coal discharge rod 15221 via a connecting sleeve, so that the hydraulic motor 15231 drives the coal discharge rod 15221 to rotate. The hydraulic control component 15232 is disposed on the hydraulic motor 15231. On one side of 1, the hydraulic control component 15232 is connected to the hydraulic motor 15231 through a hydraulic pipeline. The hydraulic control component 15232 controls the start, stop, speed and rotation direction of the hydraulic motor 15231. The hydraulic motor 15231 and the hydraulic control component 15232 are driven by hydraulic means. Compared with electric drive, the hydraulic motor 15231 and the hydraulic control component 15232 have explosion-proof characteristics, which fundamentally eliminates the risk of electric sparks igniting underground gas or coal dust, and meets the mandatory safety regulations for underground coal mines.

[0033] In this invention, a hydraulic motor 15231 with the following operating parameters can be selected: geometric displacement 1043 ml / r, maximum allowable working pressure 31.5 MPa, maximum torque 5803 N.m, and maximum speed 130 r / min. The hydraulic control component 15232 is prior art. For example, the hydraulic control component 15232 includes a control valve group, an operating handle, a pressure gauge, and other components.

[0034] Furthermore, to prevent blockage of the coal return transport pipe 151 and ensure smooth coal discharge, the vertical cross-section of the coal return transport pipe 151 is L-shaped, and the corners are rounded to reduce the impact and friction between the coal and the pipe wall, extend its service life, and lower the risk of blockage. The coal return transport pipe 151 also has a first high-pressure water nozzle 1511 and a second high-pressure water nozzle 1512. The first high-pressure water nozzle 1511 is located between the coal return transport pipe 151 and the coal discharge inlet 141. At one end, the first high-pressure water nozzle 1511 is directed towards the corner of the coal return transport pipe 151, so that the high-pressure water jet from the first high-pressure water nozzle 1511 pushes the coal return in the coal return transport pipe 151 to the corner of the coal return transport pipe 151. The second high-pressure water nozzle 1512 is located at the corner of the coal return transport pipe 151, and the direction of the second high-pressure water nozzle 1512 is directed towards the coal return transport pipe 151, extending to the outlet end above the telescopic frame 120, so that the high-pressure water jet from the second high-pressure water nozzle 1512 assists the coal return in accelerating and turning at the corner of the coal return transport pipe 151 and flowing to the outlet end above the telescopic frame 120.

[0035] In this invention, the coal return transport pipeline 151 is made of stainless steel, and its inner wall is polished to reduce the frictional resistance between the coal and the inner wall of the coal return transport pipeline 151. At the same time, the first high-pressure water nozzle 1511 and the second high-pressure water nozzle 1512 are both connected to an underground high-pressure water source (pressure ≥15MPa), with a flushing flow rate ≥50L / min. A trace amount of water-based lubricant or dust suppressant can be added to the high-pressure water flow sprayed by the first high-pressure water nozzle 1511 and the second high-pressure water nozzle 1512 to form a lubricating film between the inner wall of the coal return transport pipeline 151 and the coal return, further reducing frictional resistance and suppressing coal dust from rising.

[0036] Furthermore, the coal return hood 140 is also equipped with several atomizing nozzles 142. The spray direction of the atomizing nozzles 142 is towards the triangular coal accumulation area formed at the connection between the fixed trough 110 and the coal return hood 140. The high-pressure atomized droplets sprayed by the atomizing nozzles 142 wet the triangular coal accumulation, so that the moisture content of the coal reaches a certain amount and it becomes loose, which is conducive to the crushing of the coal by the spiral blades 15222. At the same time, the high-pressure atomized droplets sprayed by the atomizing nozzles 142 may also contain a trace amount of water-based lubricant or dust suppressant, thereby forming a lubricating film between the inner wall of the fixed trough 110 and the triangular coal accumulation, further reducing frictional resistance and suppressing coal dust from rising.

[0037] On the other hand, the present invention also provides a scraper conveyor, which includes the telescopic tail section 10 of the scraper conveyor with coal discharge function as described in the previous aspect.

[0038] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A telescopic tail section of a scraper conveyor with a coal return function, characterized in that: Includes fixed trough, telescopic frame, sprocket assembly, coal return hood, and coal discharge device; The telescopic frame is slidably connected to the fixed groove, the sprocket assembly is located at the end of the telescopic frame, and the telescopic frame moves on the fixed groove under the drive of the telescopic cylinder, so that the telescopic frame drives the sprocket assembly to pull the scraper chain on it to adjust the chain tension; The coal return hood is located at the end of the fixed trough so that the fixed trough and the coal return hood together form a cavity for collecting coal. The bottom of the coal return hood has a coal discharge inlet, and the coal discharge inlet is located above the connection between the fixed trough and the coal return hood. The coal return device includes a coal return transport pipe and a coal return conveying assembly. One end of the coal return transport pipe is connected to the coal discharge inlet, and the other end extends above the telescopic frame. The coal return conveying assembly is located in the angled area between the fixed trough and the coal return hood. The coal return conveying assembly is used to collect the triangularly accumulated coal at the connection between the fixed trough and the coal return hood and push it into the coal discharge inlet, discharging it into the coal return transport pipe. At the same time, as the coal in the coal return transport pipe gradually accumulates, once the amount of coal in the coal return transport pipe reaches a certain level, it is finally discharged from the other end of the coal return transport pipe onto the surface of the scraper chain on the telescopic frame for re-transportation.

2. The telescopic tail section of the scraper conveyor with coal return function according to claim 1, characterized in that: The coal return conveying assembly includes a coal return guide hood, a spiral coal discharge section, and a drive section. The coal return guide hood covers the coal discharge inlet. One end of the spiral coal discharge section is connected to the inner side of the fixed trough away from the coal discharge inlet. The other end of the spiral coal discharge section passes through the coal return guide hood and is connected to the output end of the drive section. The drive section is connected to the fixed trough. The drive section drives the spiral coal discharge section to rotate, so that the spiral coal discharge section pushes the triangularly accumulated coal at the connection between the fixed trough and the coal return hood into the coal return guide hood for collection. At the same time, the spiral coal discharge section pushes the coal return inside the coal return guide hood into the coal discharge inlet and discharges it into the coal return transport pipeline.

3. The telescopic tail section of the scraper conveyor with coal return function according to claim 2, characterized in that: The spiral coal discharge section includes a coal discharge rod and spiral blades surrounding its outer circumference. One end of the coal discharge rod is rotatably connected to the inner side of the fixed groove away from the coal discharge inlet. The other end of the coal discharge rod passes through the coal return guide cover and is connected to the output end of the drive unit. The drive unit drives the coal discharge rod to rotate, and the coal discharge rod drives the spiral blades to rotate, so that the spiral blades spirally feed the accumulated coal.

4. The telescopic tail section of the scraper conveyor with coal return function according to claim 3, characterized in that: The pitch of the spiral blades gradually increases from one end near the coal return guide shroud to the other end.

5. The telescopic tail section of the scraper conveyor with coal return function according to claim 4, characterized in that: The pitch of the spiral blades increases continuously from one end near the coal return guide shroud to the other end.

6. The telescopic tail section of the scraper conveyor with coal return function according to claim 4, characterized in that: The pitch of the spiral blades increases in segments from one end near the coal return guide shroud to the other end.

7. The telescopic tail section of the scraper conveyor with coal return function according to claim 2, characterized in that: The drive unit includes a hydraulic motor and a hydraulic control component. The hydraulic motor is detachably mounted on the fixed groove. The output shaft of the hydraulic motor is connected to the spiral coal discharge unit. The hydraulic control component is located on one side of the hydraulic motor and is connected to the hydraulic motor. The hydraulic control component is used to control the start / stop, speed, and direction of rotation of the hydraulic motor.

8. The telescopic tail section of the scraper conveyor with coal return function according to claim 1, characterized in that: The vertical cross-section of the coal return transport pipe is "L" shaped, and the corner of the coal return transport pipe is a rounded transition. The coal return transport pipe is also equipped with a first high-pressure water nozzle and a second high-pressure water nozzle. The first high-pressure water nozzle is located at the bottom of the end of the coal return transport pipe connected to the coal discharge inlet. The scouring direction of the first high-pressure water nozzle is towards the corner of the coal return transport pipe, so that the high-pressure water flow sprayed by the first high-pressure water nozzle pushes the coal return in the coal return transport pipe to the corner of the coal return transport pipe. The second high-pressure water nozzle is located at the corner of the coal return transport pipe. The scouring direction of the second high-pressure water nozzle is towards the coal return transport pipe and extends to the outlet end above the telescopic frame, so that the high-pressure water flow sprayed by the second high-pressure water nozzle assists the coal return in accelerating and turning at the corner of the coal return transport pipe and flowing to the outlet end above the telescopic frame.

9. The telescopic tail section of the scraper conveyor with coal return function according to claim 1, characterized in that: The coal return hood also has several atomizing nozzles.

10. A scraper conveyor, characterized in that: The telescopic tail section of the scraper conveyor with coal return function as described in any one of claims 1 to 9.

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