A movable and retractable belt conveyor circulation intermediate section device

Abstract

This invention discloses a movable and telescopic belt conveyor circulation intermediate section device, comprising: multiple telescopic units arranged in an "I" shape, with adjacent telescopic units hinged to each other; each telescopic unit includes: two relatively parallel crossbeams, a first extension cylinder and a second extension cylinder, the first extension cylinder being used to actively extend when the front side of the telescopic unit needs to step forward, and the second extension cylinder being used to actively extend when the front side of the telescopic unit needs to step forward again after the first extension cylinder has already extended; this invention realizes full automation of the downstream transportation process, increasing the coal mine mining start-up rate from the traditional 60% to over 85%, improving the overall tunnel mining efficiency by 30%, effectively solving the problems of mining imbalance and tight production continuity, while reducing equipment wear and labor costs caused by frequent shutdowns.

Description

Technical Field

[0001] This invention belongs to the field of rapid tunneling or fully mechanized mining equipment, and particularly relates to a movable and retractable belt conveyor circulation intermediate part device. Background Technology

[0002] Rapid tunneling or fully mechanized mining equipment is one of the main pieces of equipment in coal mining, providing crucial support for the smooth operation of tunneling or fully mechanized mining faces. However, due to the continuous development of complete sets of coal mining equipment in recent years, the mining intensity at coal faces has been constantly increasing. The speed of rapid tunneling or fully mechanized mining equipment is not keeping pace with the coal mining speed, leading to increasingly prominent contradictions in mining-tunneling coordination and mining-tunneling continuity. Currently, the loading and unloading process in rapid tunneling or fully mechanized mining operations consumes a significant amount of time, resulting in low tunneling or fully mechanized mining efficiency.

[0003] Currently in China, the main auxiliary equipment used in tunneling or fully mechanized mining roadways is the stepping self-propelled machine tail-end overlapping transfer machine to increase the effective overlap distance. The transfer machine's receiving section overlaps with the tail section, located below the unloading section. The transfer machine has its own overlapping trolley, which supports the overlap on the track at the head of the stepping self-propelled machine tail section. With the transfer machine pulled along, it can move along the track on the rigid frame of the stepping machine tail section, achieving an overlap distance of 30-50 mm. A telescopic body is installed behind the self-propelled tractor tail section. The front end of the telescopic body is fixed to the track, and the rear end is supported by a column and fixed to the base plate. When the self-propelled tractor tail section moves forward with the tunneling equipment, the telescopic body automatically extends forward in the same direction, and the intermediate H-frame inside the device extends accordingly. This ensures that no manual replacement of the H-frame is required during production, avoiding danger and improving tunneling efficiency. When the fully mechanized mining equipment advances, the telescopic body automatically retracts, and the self-propelled tractor tail section moves towards the belt conveyor head. The intermediate H-frame inside the device retracts accordingly, ensuring that no manual disassembly of the H-frame is required during production, avoiding danger and improving fully mechanized mining efficiency. The biggest advantage of this equipment is reduced manpower, increased safety, and improved tunneling or fully mechanized mining efficiency.

[0004] With the continuous development of mining conveying equipment in recent years, belt conveyors have evolved towards higher belt speeds and longer distances. However, this has also brought about problems such as increased equipment costs and difficulties in improving conveying efficiency. The process of moving the tail of the extendable belt conveyor and promptly replacing or disassembling the idler frames requires the belt conveyor to be shut down for manual installation (disassembly) and maintenance. This process necessitates repeated adjustments to the belt conveyor and is usually scheduled during maintenance, consuming a significant amount of time. Consequently, this leads to low tunneling or fully mechanized mining efficiency, longer operation times, exacerbated mining imbalances, and increased production costs. Summary of the Invention

[0005] The purpose of this invention is to provide a movable and retractable belt conveyor circulation intermediate section device to solve the problems of imbalance in coal mining, tight production continuity, and the need for frequent shutdowns to extend or shorten the belt during transportation.

[0006] The present invention adopts the following technical solution: a movable and telescopic belt conveyor circulation intermediate part device, comprising: multiple telescopic units arranged in an "I" shape, with adjacent telescopic units hinged to each other; Each telescopic unit includes: two relatively parallel crossbeams, a first extension cylinder and a second extension cylinder, with the first extension cylinder and the second extension cylinder respectively located at different positions on the crossbeams; The first extension cylinder is used to actively extend when the front side of the telescopic unit needs to step forward, and also to actively retract when the rear side of the telescopic unit needs to step forward. The second extension cylinder is used to extend before the first extension cylinder extends, so that the front side of the telescopic unit steps forward, and then the first extension cylinder extends to increase the step distance of the front side of the telescopic unit. It is also used to retract first when the rear side of the telescopic unit needs to step forward and the lower end of the second lifting mechanism is lifted, so as to facilitate the retraction of the first extension cylinder. After the first and second extension cylinders of the first telescopic unit extend in sequence, the front of the first telescopic unit takes a step forward. Then, after the first and second extension cylinders of the second telescopic unit extend in sequence, the first and second extension cylinders of the first telescopic unit retract in sequence during the extension process. This process is repeated until the last telescopic unit takes a step forward.

[0007] The beneficial effects of this invention are: This invention can be applied to both fully mechanized mining faces and tunneling faces. Combined with self-moving tail sections and intermediate auxiliary disassembly and assembly equipment, it forms a complete downstream transportation system. The belt can be extended or shortened without repeated manual adjustments, and the conveyor belt maintains continuous operation throughout the entire process, completely eliminating the downtime and waiting required in traditional operations. Compared to the original method requiring manual installation and maintenance, this invention achieves full automation of the downstream transportation process, increasing the coal mine's operating rate from approximately 60% to over 85%, improving the overall tunneling efficiency by 30%, effectively solving the problems of mining imbalance and tight production continuity, while also reducing equipment wear and labor costs caused by frequent downtime. The crossbeam of this invention consists of three nested telescopic sleeves, namely an outer tube, an inner tube, and an adjusting tube. Wear-resistant guide sliders are provided between adjacent sleeves to effectively reduce frictional resistance during the telescopic process and ensure accurate trajectory. When the belt needs to be extended, the second extension cylinder extends first, pushing the adjusting tube to slide smoothly along the inner tube. After the adjusting tube reaches the set stroke, the first extension cylinder extends next, pushing the inner tube to continue sliding along the outer tube, realizing multi-stage orderly telescopic movement and completing the forward step of the telescopic unit. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the telescopic unit of the present invention; Figure 2 This is a schematic diagram of the structure after the two telescopic units of the present invention are hinged together. Figure 3 This is a partial schematic diagram of the traveling unit of the present invention; Figure 4 This is a partial schematic diagram of the fixing unit of the present invention; Figure 5 This is a schematic diagram showing two telescopic units in a retracted state after being hinged together. Figure 6 A schematic diagram showing the extension of the second extension cylinder of the first telescopic unit after the two telescopic units are hinged together; Figure 7 This is a schematic diagram showing that after two telescopic units are hinged together, both the first extension cylinder and the second extension cylinder of the first telescopic unit extend. Figure 8 A schematic diagram showing that after two telescopic units are hinged together, the second extension cylinder of the first telescopic unit retracts, the first extension cylinder remains extended, and the second extension cylinder of the second telescopic unit extends. Figure 9 This is a schematic diagram showing that after two telescopic units are hinged together, the first and second extension cylinders of the first telescopic unit retract and the first and second extension cylinders of the second telescopic unit extend. Figure 10 This is a schematic diagram showing that after two telescopic units are hinged together, the first and second extension cylinders of the first telescopic unit and the first and second extension cylinders of the second telescopic unit all retract. Figure 11 This is a schematic diagram of the telescopic housing and the second extension cylinder of the present invention; Figure 12 This is a schematic diagram of the structure of the second extended hydraulic cylinder of the present invention.

[0009] in: 10. Telescopic unit; 11. Crossbeam; 12. Outer tube; 13. Inner tube; 14. Adjusting tube; 20. First lifting mechanism; 21. First support roller; 22. First extension cylinder; 30. Second lifting mechanism; 31. Second support roller; 32. Second extension cylinder; 33. Telescopic housing; 40. Lift the housing; 41. Lift the hydraulic cylinder; 50. Traveling unit; 51. Traveling upright; 52. Traveling crossbar; 53. Propulsion plate; 54. Traveling cylinder; 60. Fixing unit; 61. Fixing upright; 62. Fixing crossbar; 63. Fixing plate; 64. Fixing cylinder. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0011] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more. The term "orientation" in this invention refers to the orientation of the device or element according to the invention. Figure 1 Description of the state's progression.

[0012] This invention discloses a movable and retractable belt conveyor circulation intermediate section device, such as... Figure 1 and Figure 2 As shown, it includes: multiple telescopic units 10 arranged in an "I" shape, with adjacent telescopic units 10 hinged to each other. Each telescopic unit 10 includes: two relatively parallel crossbeams 11, a first extension cylinder 22 and a second extension cylinder 32, which are respectively located at different positions on the crossbeams 11.

[0013] The first extension cylinder 22 is used to actively extend when the front side of the telescopic unit 10 needs to step forward, and also to actively retract when the rear side of the telescopic unit 10 needs to step forward.

[0014] The second extension cylinder 32 is used to extend before the first extension cylinder 22 extends, so that the front side of the telescopic unit 10 steps forward, and then the first extension cylinder 22 extends to increase the stepping distance of the front side of the telescopic unit 10. It is also used to retract first when the rear side of the telescopic unit 10 needs to step forward and the lower end of the second lifting mechanism 30 is lifted, so as to facilitate the retraction of the first extension cylinder 22.

[0015] After the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 extend in sequence, the front side of the first telescopic unit 10 takes a step forward. Then, after the second extension cylinder 32 and the first extension cylinder 22 of the second telescopic unit 10 extend in sequence, during the extension process, the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 retract in sequence. This process is repeated until the last telescopic unit 10 takes a step forward.

[0016] The crossbeam 11 is composed of a retractable inner tube 13 and an outer tube 12 nested together. The outer tube 12 is used to accommodate the inner tube 13 and to allow the inner tube 13 to extend and retract along the inner cavity of the outer tube 12.

[0017] The telescopic unit 10 also includes: two opposing first lifting mechanisms 20 and a first extension cylinder 22.

[0018] Two opposing first lifting mechanisms 20 are located on the outside of the two outer tubes 12 respectively. The lower end of the first lifting mechanism 20 rests on the roadway floor. The upper ends of the two first lifting mechanisms 20 are fixedly connected to the two ends of the first support roller 21 respectively. The upper side of the first support roller 21 is used to support the belt. The lower half of each first lifting mechanism 20 is fixed to the rear end of the corresponding outer tube 12.

[0019] The fixed end of the first extension cylinder 22 is fixedly connected to the first outer connecting plate that spans and is fixed to the two outer tubes 12. The movable end of the first extension cylinder 22 is fixedly connected to the telescopic housing 33 that spans and is fixed to the two inner tubes 13. The first extension cylinder 22 is used to actively extend when the front side of the telescopic unit 10 needs to step forward, and is also used to actively retract when the rear side of the telescopic unit 10 needs to step forward and the lower end of the first lifting mechanism 20 is lifted, thereby completing the action of the telescopic unit 10 stepping forward.

[0020] The inner tube 13 is a retractable tube, and the inner cavity of the inner tube 13 accommodates the regulating tube 14, which is retractable and sleeved in the inner cavity of the inner tube 13.

[0021] The telescopic unit 10 also includes: two opposing second lifting mechanisms 30 and a second extension cylinder 32.

[0022] Two opposing second lifting mechanisms 30 are located on the outside of the two outer tubes 12 respectively. The lower end of the second lifting mechanism 30 rests on the roadway floor. The upper ends of the two second lifting mechanisms 30 are fixedly connected to the two ends of the second support roller 31 respectively. The upper side of the second support roller 31 is used to support the belt. The lower half of each second lifting mechanism 30 is fixed to the front end of the corresponding outer tube 12.

[0023] The fixed end of the second extension cylinder 32 is fixedly connected to the telescopic housing 33, and the movable end of the second extension cylinder 32 is fixedly connected to the extension rod that spans and is fixed to the two adjusting pipes 14. The second extension cylinder 32 is used to extend before the first extension cylinder 22 extends. The second extension cylinder 32 is also used to retract when the rear side of the telescopic unit 10 needs to step forward. When the second extension cylinder 32 is in the retracted state, its movable end is close to the movable end of the first extension cylinder 22, thereby shortening the length of the telescopic unit 10 in the retracted state.

[0024] Both the first lifting mechanism 20 and the second lifting mechanism 30 include: a lifting housing 40, which is vertically arranged and fixedly connected to a first fixed ring or a second fixed ring. The upper end of the lifting housing 40 is fixedly connected to the corresponding first support roller 21 or second support roller 31. A lifting cylinder 41 is installed inside the lifting housing 40. The movable end of the lifting cylinder 41 is used to extend downward and abut against the roadway floor to support the crossbeam 11. The movable end of the lifting cylinder 41 is also used to retract upward into the lifting housing 40 and leave the roadway floor, thereby facilitating the operation of the first extension cylinder 22 and the second extension cylinder 32.

[0025] A force-bearing plate is provided between the two opposing lifting housings 40. The force-bearing plate is located below the moving ends of the crossbeam 11 and the lifting cylinder 41. The two ends of the force-bearing plate are respectively hinged to the moving ends of the two lifting cylinders 41, thereby making the two opposing first lifting mechanisms 20 or second lifting mechanisms 30 a whole.

[0026] A traveling unit 50 is provided in front of the first telescopic unit 10. The traveling unit 50 is used to push the coal or gangue blocking the front of the telescopic unit 10 to both sides.

[0027] like Figure 3 As shown, the traveling unit 50 includes: two traveling uprights 51, two traveling crossbars 52, a propulsion plate 53, and two traveling cylinders 54.

[0028] Two traveling poles 51 are vertically arranged, and the lower ends of the two traveling poles 51 are fixedly connected to the crossbeam 11 of the foremost telescopic unit 10.

[0029] Two horizontal traveling bars 52 are set horizontally, and the rear ends of the two traveling bars 52 are hinged to the lower ends of the two traveling uprights 51 respectively.

[0030] The push plate 53 is "V" shaped and the opening faces the telescopic unit 10.

[0031] Two traveling cylinders 54 are inclined. The fixed ends of the two traveling cylinders 54 are hinged to the upper ends of the corresponding traveling uprights 51. The movable ends of the two traveling cylinders 54 are respectively hinged to the two ends of the push plate 53. The traveling cylinders 54 are used to push the push plate 53 downward against the roadway floor when extended, so as to push the coal mine or gangue on the ground to both sides. They are also used to rotate the push plate 53 upward and lift it when retracted, so as to avoid interfering with the forward movement of the telescopic unit 10.

[0032] A fixing unit 60 is provided on the rear side of the last telescopic unit 10. The fixing unit 60 is used to penetrate into the tunnel floor and thus withstand the reverse thrust of the first extension cylinder 22 or the second extension cylinder 32.

[0033] like Figure 4 As shown, the fixing unit 60 includes: two fixing uprights 61, two fixing crossbars 62, a fixing plate 63, and two fixing cylinders 64.

[0034] Two fixed uprights 61 are set vertically, and the lower ends of the two fixed uprights 61 are fixedly connected to the crossbeam 11 of the telescopic unit 10 on the last side.

[0035] Two fixed horizontal bars 62 are set horizontally, and the front ends of the two fixed horizontal bars 62 are hinged to the lower ends of the two fixed vertical bars 61 respectively.

[0036] The fixing plate 63 is set across the two fixing crossbars 62; the lower end of the fixing plate 63 is set in a tooth shape.

[0037] Two fixed hydraulic cylinders 64 are inclined, and the fixed ends of the two fixed hydraulic cylinders 64 are hinged to the upper ends of the corresponding fixed uprights 61. The movable ends of the two fixed hydraulic cylinders 64 are respectively hinged to the two ends of the fixed plate 63. The fixed hydraulic cylinders 64 are used to make the fixed plate 63 plunge downward into the tunnel floor when it extends. The fixed hydraulic cylinders 64 are also used to make the fixed plate 63 rotate upward and lift up when it retracts, so as to avoid interfering with the forward movement of the telescopic unit 10.

[0038] In practical use, multiple telescopic units 10 can be hinged together in sequence to form an intermediate device. A traveling unit 50 can be set in front of the first telescopic unit 10 to push coal or gangue blocking the front of the telescopic unit 10 to both sides. A fixing unit 60 can be set in the rear of the last telescopic unit 10 to penetrate into the roadway ground and withstand the reverse thrust of the first extension cylinder 22 or the second extension cylinder 32. The combination of traveling unit 50 and fixing unit 60 makes it more suitable for actual production.

[0039] like Figure 12 As shown, preferably, the second extension cylinder 32 is a flange-pushing cylinder, which can significantly reduce the length of the telescopic unit 10 in the retracted state. Specifically, the flange fixing part of the second extension cylinder 32 is located on the side near the movable end of the second extension cylinder 32, so that when both the first extension cylinder 22 and the second extension cylinder 32 retract, as shown... Figure 11 As shown, this makes the first extension cylinder 22 and the second extension cylinder 32 closer to each other, thus shortening the length of the telescopic unit 10 in the retracted state, making the telescopic unit 10 occupy less distance in the roadway and more compact.

[0040] The stepping process of the intermediate device, which consists of two interconnected telescopic units 10 and is equipped with a traveling unit 50 and a fixed unit 60, will be broken down and described below: like Figure 10 As shown, the first and second telescopic units 10 of the two hinged telescopic units 10 are in a retracted state. By default, the left side of the figure is forward, so the telescopic unit 10 on the left is the first telescopic unit 10, and the telescopic unit 10 on the right is the second telescopic unit 10.

[0041] like Figure 5 As shown, both of the hinged telescopic units 10 are in the retracted state, indicating that the intermediate equipment has not yet been deployed.

[0042] Next step, such as Figure 6 As shown, the second extension cylinder 32 of the first telescopic unit 10 extends out of the two hinged telescopic units 10; at this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 are both in a supported state, which can ensure the support force at the bottom of the second extension cylinder 32 when it extends forward.

[0043] Next step, such as Figure 7 The diagram shows the first extension cylinder 22 and the second extension cylinder 32 of the first telescopic unit 10, which are hinged together, both extending; that is, in Figure 6 Based on this, the first extension cylinder 22 continues to extend. When the first extension cylinder 22 and the second extension cylinder 32 extend, they can drive the inner tube 13 and the adjusting tube 14 to extend, thereby completing the second step of the first telescopic unit 10 moving forward.

[0044] Next step, such as Figure 8As shown, the second extension cylinder 32 of the first telescopic unit 10 retracts while the first extension cylinder 22 remains extended. At this time, the second extension cylinder 32 of the second telescopic unit 10 extends, causing the second telescopic unit 10 to step forward. At this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 are both in an upward state, supported by the first lifting mechanism 20 and the second lifting mechanism 30 of the second telescopic unit 10.

[0045] Next step, such as Figure 9 As shown, both the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 retract, meaning the first telescopic unit 10 completes its forward step. Meanwhile, both the second extension cylinder 32 and the first extension cylinder 22 of the second telescopic unit 10 extend. At this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 remain in an upward-lifted state, supported by the front outrigger, completing the forward step of the first telescopic unit 10. The front of the second telescopic unit 10 completes its forward step. At this time, both the first lifting mechanism 20 and the second lifting mechanism 30 of the second telescopic unit 10 are in a supported state, meaning the lifting cylinder 41 is extended.

[0046] Next step, such as Figure 10 As shown, the second extension cylinder 32 and the first extension cylinder 22 of the second telescopic unit 10 retract sequentially. At this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 are both in a supported state, and the first lifting mechanism 20 and the second lifting mechanism 30 of the second telescopic unit 10 are both in an upward state, supported by the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10.

[0047] At this point, since this application describes an intermediate device composed of two telescopic units 10, it is equivalent to the two telescopic units 10 having completed one step, i.e., the entire intermediate device having completed a step. If, in actual use, an intermediate device is formed by hinged multiple telescopic units 10 sequentially, then it is necessary to extend the second extension cylinder 32 and the first extension cylinder 22 of the third telescopic unit 10 sequentially while the first and second telescopic units 10 are retracted, so that the front of the third telescopic unit 10 completes a forward step. Then, the second extension cylinder 32 and the first extension cylinder 22 of the third telescopic unit 10 are retracted sequentially. This process is repeated until all telescopic units 10 have completed a step. Finally, the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 are extended sequentially again, and this process is repeated.

[0048] The following explanation continues with the repeated steps for the two telescopic units 10 for easier understanding. The next step is as follows... Figure 7As shown, the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 are extended in sequence. At this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 and the second telescopic unit 10 are both in a supported state.

[0049] Next step, such as Figure 8 , 9 As shown, while the second extension cylinder 32 and the first extension cylinder 22 of the first telescopic unit 10 are retracted in sequence, the second extension cylinder 32 and the first extension cylinder 22 of the second telescopic unit 10 are extended in sequence. At this time, the entire forward movement of the first telescopic unit 10 is completed. At this time, the first lifting mechanism 20 and the second lifting mechanism 30 of the first telescopic unit 10 are both in an upward state, while the first lifting mechanism 20 and the second lifting mechanism 30 of the second telescopic unit 10 are both in a supporting state and are not providing support.

[0050] Next step, such as Figure 10 As shown, the second extension cylinder 32 and the first extension cylinder 22 of the second telescopic unit 10 are retracted in sequence, thus completing the overall forward movement of the second telescopic unit 10. At this time, both the first lifting mechanism 20 and the second lifting mechanism 30 of the second telescopic unit 10 are in an upward state and are not providing support.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A movable and retractable belt conveyor circulation intermediate section device, characterized in that, include: Multiple telescopic units (10) arranged in an "I" shape, with adjacent telescopic units (10) hinged to each other; Each of the telescopic units (10) includes: two relatively parallel crossbeams (11), a first extension cylinder (22) and a second extension cylinder (32), wherein the first extension cylinder (22) and the second extension cylinder (32) are respectively located at different positions on the crossbeams (11); The first extension cylinder (22) is used to actively extend when the front side of the telescopic unit (10) needs to step forward, and is also used to actively retract when the rear side of the telescopic unit (10) needs to step forward. The second extension cylinder (32) is used to extend before the first extension cylinder (22) extends, so that the front side of the telescopic unit (10) steps forward, and then the first extension cylinder (22) extends to increase the step distance of the front side of the telescopic unit (10). It is also used to retract first when the rear side of the telescopic unit (10) needs to step forward and the lower end of the second lifting mechanism (30) is lifted, so as to facilitate the retraction of the first extension cylinder (22). After the second extension cylinder (32) and the first extension cylinder (22) of the first telescopic unit (10) extend in sequence, the front side of the first telescopic unit (10) completes the forward step. Then, after the second extension cylinder (32) and the first extension cylinder (22) of the second telescopic unit (10) extend in sequence, and during the extension process, the second extension cylinder (32) and the first extension cylinder (22) of the first telescopic unit (10) retract in sequence. This process is repeated until the last telescopic unit (10) completes the forward step. The crossbeam (11) is composed of a retractable inner tube (13) and an outer tube (12) nested together. The outer tube (12) is used to accommodate the inner tube (13) and to allow the inner tube (13) to extend and retract along the inner cavity of the outer tube (12). The telescopic unit (10) also includes: Two opposing first lifting mechanisms (20) are located on the outside of the two outer tubes (12), respectively. The lower end of the first lifting mechanism (20) rests on the roadway floor, and the upper ends of the two first lifting mechanisms (20) are fixedly connected to the two ends of the first support roller (21). The upper side of the first support roller (21) is used to support the belt. The lower half of each first lifting mechanism (20) is fixed to the rear end of the corresponding outer tube (12). The first extension cylinder (22) has its fixed end fixedly connected to the first outer connecting plate that spans and is fixed to the two outer tubes (12), and its movable end fixedly connected to the telescopic housing (33) that spans and is fixed to the two inner tubes (13). The first extension cylinder (22) is used to actively extend when the front side of the telescopic unit (10) needs to step forward, and is also used to actively retract when the rear side of the telescopic unit (10) needs to step forward and the lower end of the first lifting mechanism (20) is lifted, thereby completing the action of the telescopic unit (10) stepping forward.

2. The movable and retractable belt conveyor circulation intermediate section device according to claim 1, characterized in that, The inner tube (13) is a retractable tube body, and the inner cavity of the inner tube (13) accommodates an adjusting tube (14), which is retractable and sleeved in the inner cavity of the inner tube (13); The telescopic unit (10) also includes: Two opposing second lifting mechanisms (30) are located on the outside of the two outer tubes (12), respectively. The lower end of the second lifting mechanism (30) rests on the roadway floor, and the upper ends of the two second lifting mechanisms (30) are fixedly connected to the two ends of the second support roller (31). The upper side of the second support roller (31) is used to support the belt. The lower half of each second lifting mechanism (30) is fixed to the front end of the corresponding outer tube (12). The second extension cylinder (32) has its fixed end fixedly connected to the telescopic housing (33) and its movable end fixedly connected to the extension rod that spans and is fixed to the two adjustment tubes (14). The second extension cylinder (32) is used to extend before the first extension cylinder (22) extends, and is also used to retract when the rear side of the telescopic unit (10) needs to step forward. When the second extension cylinder (32) is in the retracted state, its movable end is close to the movable end of the first extension cylinder (22), thereby shortening the length of the telescopic unit (10) in the retracted state.

3. The movable and retractable belt conveyor circulation intermediate section device according to claim 2, characterized in that, Both the first lifting mechanism (20) and the second lifting mechanism (30) include: The lifting housing (40) is vertically arranged and fixedly connected to the first or second fixed ring. The upper end of the lifting housing (40) is fixedly connected to the corresponding first support roller (21) or second support roller (31). A lifting cylinder (41) is installed inside. The movable end of the lifting cylinder (41) is used to extend downward and abut against the roadway floor to support the crossbeam (11). The movable end of the lifting cylinder (41) is also used to retract upward into the lifting housing (40) and leave the roadway floor, so as to facilitate the operation of the first extension cylinder (22) and the second extension cylinder (32).

4. The movable and retractable belt conveyor circulation intermediate section device according to claim 3, characterized in that, A force-bearing plate is provided between two opposing lifting housings (40). The force-bearing plate is located below the moving ends of the crossbeam (11) and the lifting cylinder (41). The two ends of the force-bearing plate are respectively hinged to the moving ends of the two lifting cylinders (41), thereby making the two opposing first lifting mechanisms (20) or second lifting mechanisms (30) a whole.

5. The movable and retractable belt conveyor circulation intermediate section device according to claim 1, characterized in that, A traveling unit (50) is provided on the front side of the first telescopic unit (10), and the traveling unit (50) is used to push the coal or gangue blocking the front side of the telescopic unit (10) to both sides; The traveling unit (50) includes: Two traveling uprights (51) are set vertically, and their lower ends are fixedly connected to the crossbeam (11) of the frontmost telescopic unit (10); Two horizontal travel bars (52) are set horizontally, and their rear ends are hinged to the lower ends of two vertical travel bars (51) respectively. The push plate (53) is "V" shaped and the opening faces the telescopic unit (10); Two traveling cylinders (54) are inclined and their fixed ends are hinged to the upper ends of the corresponding traveling uprights (51). Their movable ends are respectively hinged to the two ends of the propulsion plate (53). The traveling cylinders (54) are used to push the propulsion plate (53) downward against the roadway ground when they extend, and to push the coal mine or gangue on the ground to both sides when they retract, so as to rotate the propulsion plate (53) upward and lift it up to avoid interfering with the forward movement of the telescopic unit (10).

6. The movable and retractable belt conveyor circulation intermediate section device according to claim 1, characterized in that, A fixing unit (60) is provided on the rear side of the last telescopic unit (10). The fixing unit (60) is used to be driven into the roadway ground to withstand the reverse thrust of the first extension cylinder (22) or the second extension cylinder (32). The fixing unit (60) includes: Two fixed uprights (61) are set vertically, and their lower ends are fixedly connected to the crossbeam (11) of the telescopic unit (10) on the last side; Two fixed horizontal bars (62) are set horizontally, and their front ends are hinged to the lower ends of two fixed vertical bars (61) respectively; A fixing plate (63) is provided across the two fixing crossbars (62); its lower end is toothed. Two fixed cylinders (64) are inclined and their fixed ends are hinged to the upper ends of the corresponding fixed uprights (61). Their movable ends are respectively hinged to the two ends of the fixed plate (63). The fixed cylinders (64) are used to make the fixed plate (63) plunge downward into the roadway ground when it extends, and also to make the fixed plate (63) rotate upward and lift when it retracts, so as to avoid interfering with the forward movement of the telescopic unit (10).

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