Protection device for preventing iron from being wound into belt conveyor

Abstract

The invention relates to a protection device for preventing iron from being wound into a belt conveyor, and belongs to the technical field of belt conveyors. Comprising a frame, two I-shaped supports and two moving blocks are arranged at the head end of the frame in a sliding mode, two transmission rollers distributed up and down are rotationally arranged between the two I-shaped supports, an adjusting roller is rotationally arranged between the two moving blocks, and a loading frame is arranged between the upper ends of the two I-shaped supports; the left side and the right side of the head end of the frame are each fixedly provided with a fixing base, a row of supporting rollers are arranged in each fixing base in a sliding mode, and a first linkage mechanism is arranged between the supporting rollers and the loading frame. A second linkage mechanism is arranged between the I-shaped bracket on one side and the moving block; the problem that coal accumulation is formed at the machine head end of the belt conveyor when supporting materials are detached at present is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of belt conveyors, specifically relating to a protective device to prevent iron objects from getting caught in a belt conveyor. Background Technology

[0002] In the mining process, belt conveyors are the core transportation equipment connecting the coal face with the subsequent transport roadways. Their primary function is to transport coal produced from the coal face, making them a crucial hub for ensuring mine production output. Simultaneously, to meet the continuous requirements of underground roadway support operations (roadways need timely support after excavation to ensure operational safety), belt conveyors also need to transport metal support materials. These materials include anchor bolts, anchor cables, pallets, and metal support beams. These materials are typically carried on a dedicated unloading platform and then transported by the conveyor from the material storage area (near the head end) to the roadway support operation area (near the tail end). This prevents the support materials from directly contacting the belt, which could cause belt wear or conveyor misalignment, ensuring that support operations can proceed synchronously with the mining progress.

[0003] In the process of transporting metal support materials by belt conveyors, in order to prevent the support materials (hereinafter referred to as "iron objects") from being rolled into transmission components such as tail rollers and adjusting rollers along with the belt (causing equipment jamming, belt tearing and other malfunctions, or even safety accidents), existing technologies generally install metal detection components and shutdown control logic at the tail end of the conveyor: when the metal detector detects that the unloading platform carrying the support materials has reached the designated dismantling position at the tail end, it will immediately trigger the conveyor shutdown command, causing the conveyor to stop running. Workers can then safely dismantle the unloading platform and the support materials, and then transfer the support materials to the roadway support operation point. However, it should be noted that coal mining operations are continuous. The coal loading equipment (such as coal mining machines and scraper conveyors) that are paired with belt conveyors need to operate 24 hours a day to ensure coal production efficiency. If the belt conveyor stops due to the dismantling of support materials, the coal loading equipment cannot stop simultaneously (otherwise, it will cause coal accumulation at the coal face and interruption of the mining process). At this time, the coal continuously conveyed by the coal loading equipment will not be able to be transported out through the belt conveyor, resulting in coal accumulation at the head end. This may not only block the outlet of the coal loading equipment, but also cause the belt at the head end to bear excessive static load, causing problems such as belt deformation and deviation. This forms the core contradiction between "the need to stop the machine when dismantling support materials" and "the need for continuous operation of coal loading equipment".

[0004] Therefore, it is necessary to provide a new protective device to prevent iron objects from getting caught in the conveyor belt and solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and proposes a protective device to prevent iron objects from being caught in the belt conveyor; it also solves the problem of coal accumulation at the head end of the belt conveyor when dismantling support materials.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0007] A protective device for preventing iron objects from getting caught in a belt conveyor includes a frame. A tail roller is rotatably mounted inside the rear end of the frame. Two I-beam supports and two movable blocks are slidably mounted at the front end of the frame. The movable blocks are located on the side of the I-beam supports closest to the tail roller. Two vertically distributed drive rollers are rotatably mounted between the two I-beam supports. An adjusting roller is rotatably mounted between the two movable blocks. The belt sequentially passes over the tail roller, the upper drive roller, the adjusting roller, and the lower drive roller. A loading frame is provided between the upper ends of the two I-beam supports. A loading frame is fixed on the left and right sides of the front end of the frame. A fixed base is provided, and a row of support rollers is slidably installed inside each fixed base. A first linkage mechanism is provided between the support rollers and the loading frame. When the loading frame slides forward, the first linkage mechanism drives the two rows of support rollers to extend into the frame to support the conveyor belt. A second linkage mechanism is provided between the I-shaped bracket and the moving block on one side. When the I-shaped bracket moves back and forth, the second linkage mechanism drives the moving block to move back and forth simultaneously. The moving distances of the I-shaped bracket and the moving block are kept different. A discharge platform is provided inside the conveyor belt, and a metal detector is fixedly installed inside the rear end of the frame.

[0008] Furthermore, a horizontally extending slide groove is provided on the left and right side walls at the front end of the frame, and an I-shaped bracket and a moving block are slidably installed inside each slide groove.

[0009] Furthermore, the two ends of the upper drive roller's shaft are hinged to the upper ends of the two I-shaped supports located inside the frame, and the two ends of the lower drive roller's shaft are hinged to the lower ends of the two I-shaped supports located inside the frame; the adjusting roller is located between the two drive rollers on the side near the tail roller.

[0010] Furthermore, the conveyor belt extends forward after passing over the tail roller, extends backward after passing over the upper drive roller, extends forward after passing over the adjusting roller, extends backward after passing over the lower drive roller, and finally returns to the tail roller; a row of bearing rollers is rotatably arranged between the inner walls of the left and right sides of the frame.

[0011] Furthermore, the first linkage mechanism includes an extension plate and a guide groove; an extension plate is fixedly installed on the lower side of the left and right ends of the loading frame, and the lower end surfaces of the two extension plates are in sliding contact with the upper end surfaces of the two fixed seats respectively; a guide groove is provided on the lower end surfaces of the two extension plates respectively, and the guide groove includes a straight segment and an inclined segment. The straight segment is located in front of the inclined segment, and the rear end of the straight segment is connected to the front end of the inclined segment; the straight segment remains horizontal front to back, and the rear end of the inclined segment extends inclinedly towards the guide groove on the other side.

[0012] Furthermore, the first linkage mechanism also includes a connecting seat and a guide rod; a row of slots arranged equidistantly in front and behind are provided inside each fixed seat, and one end of the slot is open and connected to the inside of the frame; a horizontal sliding groove is provided at the upper end of each slot, a connecting seat is slidably provided inside each slot, a vertical guide rod is fixedly provided at the upper end of the connecting seat, the guide rod is slidably inserted into the sliding groove, and the upper ends of the guide rods on the left and right sides correspond to the guide grooves on the two sides respectively; a support roller is rotatably provided at the end of the connecting seat near the frame.

[0013] Furthermore, a slot ring is provided at one end of the support roller near the connecting seat; a groove is provided inside the opening at one end of the slot, and a slide plate is slidably arranged inside each groove, with a spring between the slide plate and the bottom surface of the groove; a locking post is fixedly arranged at the center of the outer side of each slide plate, with one end of the locking post having a spherical design and extending to the outside of the opening of the groove.

[0014] Furthermore, an electric push rod is fixedly installed on one side of the outer wall of the frame, and the piston rod end of the electric push rod is fixedly connected to the I-shaped bracket on the same side.

[0015] Furthermore, the second linkage mechanism includes a connecting shaft, a threaded rod, a driving bevel gear, a driven bevel gear, a rack, and a spur gear; a horizontally aligned connecting shaft is rotatably mounted on one of the I-shaped supports, and a coaxial threaded rod is fixedly mounted at the rear end of the connecting shaft, the threaded rod being threaded to a moving block on the same side; a driven bevel gear is fixedly mounted at the front end of the connecting shaft; a spur gear is rotatably mounted at the front end of the I-shaped support, and a horizontally aligned rack is fixedly mounted on the outer wall of the frame, the rack meshing with the spur gear; a driving bevel gear is fixedly mounted on the upper end of the spur gear, the driving bevel gear meshing with the driven bevel gear.

[0016] Furthermore, the unloading platform is located at the bottom inside the conveyor belt; the metal detector is located at the upper rear end inside the conveyor belt.

[0017] The beneficial effects of this invention compared to the prior art are as follows: This device utilizes an extendable head structure formed by the interlocking of an I-beam support and a sliding groove on the frame. When the conveyor stops due to the removal of support materials, the I-beam support can be driven to move outwards from the head, expanding the coal receiving area (with the loading frame and the extended conveyor belt working in tandem), continuously receiving coal conveyed by the coal loading equipment. This completely breaks the limitation that "stopping the machine to remove support materials inevitably leads to the shutdown of the coal loading equipment," ensuring that workers can safely remove the support materials at the tail end of the machine (avoiding the risk of iron objects getting caught), while ensuring that the coal mining machine, scraper conveyor, and other coal loading equipment operate 24 hours a day without interruption. This fundamentally eliminates the problems of coal accumulation at the coal face and interruption of the mining process, ensuring a stable output of mine production capacity.

[0018] In this device, the support rollers adhere to the bottom surface of the conveyor belt when the machine head extends, and achieve stable positioning through the engagement of the slot ring and the locking post. This effectively suppresses the sagging of the conveyor belt caused by coal accumulation (the sagging amount can be controlled within 10mm), prevents the aggravation of local wear caused by uneven contact between the conveyor belt and the bearing roller, and improves the safety and reliability of equipment operation. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the bearing roller; Figure 3 This is a schematic diagram of the internal structure of the mounting base; Figure 4 This is a schematic diagram of the framework structure; Figure 5 This is a schematic diagram showing the connection between the loading frame, the I-beam support, the moving block, and the second linkage mechanism. Figure 6 This is a schematic diagram showing the connection between the loading frame and the extension plate; Figure 7 for Figure 1 A magnified view of a portion of point A in the middle; Figure 8 for Figure 4 A magnified view of a portion of point B in the middle; Among them, 1 is the frame, 2 is the bearing roller, 3 is the tail roller, 4 is the transmission roller, 5 is the adjusting roller, 6 is the conveyor belt, 7 is the I-shaped bracket, 8 is the loading frame, 9 is the extension plate, 10 is the guide groove, 11 is the fixed seat, 12 is the slot, 13 is the support roller, 14 is the connecting seat, 15 is the guide rod, 16 is the metal detector, 17 is the unloading platform, 18 is the slide, 19 is the moving block, 20 is the electric push rod, 21 is the connecting shaft, 22 is the threaded rod, 23 is the driven bevel gear, 24 is the spur gear, 25 is the driving bevel gear, 26 is the rack, 27 is the slot ring, 28 is the groove, 29 is the spring, 30 is the slide plate, and 31 is the locking post. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0021] like Figure 1 As shown in Figure 8, this invention provides a protective device to prevent iron objects from getting caught in a conveyor belt. The device includes a frame 1, with a tail roller 3 rotatably mounted inside the tail end of the frame 1. Two I-beam supports 7 and two movable blocks 19 are slidably mounted at the head end of the frame 1. The movable blocks 19 are located on the side of the I-beam supports 7 closest to the tail roller 3. Two vertically distributed drive rollers 4 are rotatably mounted between the two I-beam supports 7. An adjusting roller 5 is rotatably mounted between the two movable blocks 19. The conveyor belt 6 sequentially passes over the tail roller 3, the upper drive roller 4, the adjusting roller 5, and the lower drive roller 4. A loading frame 8 is provided between the upper ends of the two I-beam supports 7. The frame 8 is located on the left and right sides of the head end of the frame 1. Each frame 1 has a fixed base 11, and each fixed base 11 has a row of support rollers 13 slidably arranged inside. A first linkage mechanism is provided between the support rollers 13 and the loading frame 8. When the loading frame 8 slides forward, the first linkage mechanism drives the two rows of support rollers 13 to extend into the frame 1 to support the tape 6. A second linkage mechanism is provided between the I-shaped bracket 7 and the moving block 19 on one side. When the I-shaped bracket 7 moves back and forth, the second linkage mechanism drives the moving block 19 to move back and forth at the same time. The moving distances of the I-shaped bracket 7 and the moving block 19 are kept different. A discharge table 17 is provided inside the tape 6. A metal detector 16 is fixedly installed inside the tail end of the frame 1.

[0022] The frame 1 is a U-shaped plate structure extending front to back. A horizontally extending groove 18 is provided on the left and right side walls at the front end of the frame 1. An I-shaped bracket 7 and a movable block 19 are slidably mounted inside each groove 18. The two I-shaped brackets 7 and the two movable blocks 19 are symmetrically arranged left and right. The I-shaped bracket 7 includes two symmetrical side plates and a horizontal connecting plate. The two ends of the connecting plate are fixedly connected to the middle of the adjacent end faces of the two side plates. The connecting plate is slidably engaged inside the groove 18, with the two side plates located on opposite sides of the groove 18.

[0023] The two ends of the upper drive roller 4 are hinged to the upper ends of the two I-shaped supports 7 located inside the frame 1, and the two ends of the lower drive roller 4 are hinged to the lower ends of the two I-shaped supports 7 located inside the frame 1. The upper end of the upper drive roller 4 is flush with the upper end of the tail roller 3, and the lower end of the lower drive roller 4 is flush with the lower end of the tail roller 3. The adjusting roller 5 is located between the two drive rollers 4, close to the tail roller 3. The conveyor belt 6 extends forward after passing over the tail roller 3, extends backward after passing over the upper drive roller 4, extends forward after passing over the adjusting roller 5, extends backward after passing over the lower drive roller 4, and finally returns to the tail roller 3. A row of bearing rollers 2 arranged sequentially are rotatably arranged between the inner walls of the left and right sides of the frame 1, supporting the conveyor belt 6.

[0024] The unloading platform 17 is located at the bottom inside the conveyor belt 6. The metal detector 16 is located at the upper rear end inside the conveyor belt 6.

[0025] The loading frame 8 is a square frame structure with openings at both the top and bottom. The left and right sides of the lower end face of the loading frame 8 are fixedly connected to the upper inner sides of the two I-shaped supports 7, so that the loading frame 8 moves synchronously with the two I-shaped supports 7.

[0026] The first linkage mechanism includes an extension plate 9, a guide groove 10, a connecting seat 14, and a guide rod 15.

[0027] A horizontal extension plate 9 is fixedly installed on the lower side of each of the left and right ends of the loading frame 8. The two extension plates 9 are symmetrical and their lower ends are in sliding contact with the upper ends of the two fixed seats 11. A guide groove 10 is provided on the lower end of each of the two extension plates 9. The front and rear ends of the guide groove 10 are open. The two guide grooves 10 are symmetrical. Each guide groove 10 includes a straight section and an inclined section. The straight section is located in front of the inclined section, and its rear end is connected to the front end of the inclined section. The straight section is horizontal, and the rear end of the inclined section extends inclinedly towards the guide groove 10 on the other side.

[0028] Inside each fixed base 11, a row of slots 12 arranged equidistantly front to back is provided. The slots 12 are horizontally arranged in the left-right direction, and both ends of the slots 12 are open. The inner end of the slot 12 is connected to the inside of the frame 1. A horizontal sliding groove is provided at the upper end of each slot 12, and the slot 12 is connected to the upper surface of the fixed base 11 through the sliding groove. A connecting base 14 is slidably arranged inside each slot 12. A vertical guide rod 15 is fixedly arranged at the upper end of the connecting base 14. The guide rod 15 is slidably inserted into the sliding groove. The upper ends of the guide rods 15 on the left and right sides correspond to the guide grooves 10 on the two sides, respectively. A support roller 13 is rotatably arranged at the end of the connecting base 14 near the frame 1.

[0029] A circular groove ring 27 is provided at one end of the support roller 13 near the connecting seat 14. A groove 28 is provided inside the opening at one end of the slot 12. A circular slide plate 30 is slidably disposed in each groove 28. The outer diameter of the slide plate 30 is larger than the inner diameter of the opening of the groove 28. A spring 29 is provided between the slide plate 30 and the inner bottom surface of the groove 28. A locking post 31 is fixedly disposed at the center of the outer side of each slide plate 30. The outer end of the locking post 31 is spherical and extends to the outside of the opening of the groove 28.

[0030] An electric push rod 20 is fixedly installed on one side of the outer wall of the frame 1. The telescopic rod of the electric push rod 20 is horizontally set along the front-back direction. The piston rod end of the electric push rod 20 is fixedly connected to the I-shaped bracket 7 on the same side. The extension and retraction of the electric push rod 20 controls the front-back movement of the I-shaped bracket 7. The I-shaped bracket 7 drives the upper and lower transmission rollers 4 to move back and forth synchronously.

[0031] The second linkage mechanism includes a connecting shaft 21, a threaded rod 22, a driving bevel gear 25, a driven bevel gear 23, a rack 26, and a spur gear 24.

[0032] A horizontally oriented connecting shaft 21 is rotatably mounted on one of the I-shaped supports 7. A coaxial threaded rod 22 is fixedly mounted at the rear end of the connecting shaft 21, and the threaded rod 22 is screwed to a moving block 19 on the same side. A driven bevel gear 23 is fixedly mounted at the front end of the connecting shaft 21. A spur gear 24 is rotatably mounted at the front end of the I-shaped support 7, with its axis remaining vertical. A horizontally oriented rack 26 is fixedly mounted on the outer wall of the frame 1, and the rack 26 meshes with the spur gear 24. A driving bevel gear 25 is fixedly mounted on the upper end of the spur gear 24, and the driving bevel gear 25 meshes with the driven bevel gear 23.

[0033] The working principle of this invention is as follows: This device is specifically designed for underground belt conveyors and has two core functions: first, to transport metal support materials such as anchor bolts, anchor cables, pallets, and metal support beams (directional conveying is achieved through the unloading platform 17); and second, to transport coal in conjunction with the normal coal mining process. At the same time, a metal detector 16 is used to prevent iron objects (support materials) from being caught in the conveyor, and when the machine is stopped to dismantle the support materials, the extendable structure at the machine head receives the continuous coal supply from the coal loading equipment (to prevent the coal loading equipment from stopping), thus ensuring the support stability and tension of the belt 6.

[0034] In the initial state, all components of the device are in their preset positions. The conveyor belt 6 inside the frame 1 sequentially wraps around the tail roller 3, the upper drive roller 4, the adjusting roller 5, and the lower drive roller 4, forming a rectangular loop. The bearing rollers 2 inside the frame 1 are evenly distributed along the front-to-back direction, supporting the conveying surface of the conveyor belt 6 and simultaneously bearing the weight of the coal and the unloading platform 17. The support rollers 13 on both the left and right sides extend into their corresponding slots 12, not contacting the conveyor belt 6, and do not participate in any support or limiting function.

[0035] When the mine is operating normally, the belt conveyor needs to transport coal and support materials simultaneously or alternately.

[0036] If transporting support materials, place anchor bolts, anchor cables, and other support materials on the unloading platform 17; if transporting coal, the coal loading equipment directly supplies coal to the conveyor belt 6 at the head end of the machine. After starting the belt conveyor, the drive roller 4 drives the conveyor belt 6 to rotate, and the unloading platform 17 and the coal are transported synchronously or in batches from the head to the tail of the machine.

[0037] During transportation, the load-bearing rollers 2 inside the frame 1 rotate synchronously with the conveyor belt 6, continuously supporting the conveying surface and fully bearing the weight of the conveyor belt 6, coal and support materials, reducing the sagging of the conveyor belt 6; the support rollers 13 on both sides always extend into the corresponding slots 12 and do not provide any support or limit for the conveyor belt 6.

[0038] When the unloading platform 17 is conveyed to the tail end of the machine, the metal detector 16 detects the metal signal of the unloading platform 17 and the support material, and immediately sends a command to stop the belt conveyor. At this time, the workers can safely disassemble the unloading platform 17 and the support material at the tail end of the machine.

[0039] Because the belt conveyor stops operating when the support materials are dismantled, while the coal loading equipment in the mine needs to continue running, the conveyor head is designed as an extendable structure. When the belt conveyor stops, the controller head extends, temporarily expanding the receiving area at the head end to continuously receive coal from the loading equipment, preventing coal accumulation and blockage or forced shutdown of the loading equipment. However, after the head end extends, the receiving surface of belt 6 also extends synchronously, resulting in a lack of support for the newly added coal receiving section at the head end. This can easily lead to local sagging, excessive pressure, or even belt 6 loosening and shifting due to the weight of the coal. At the same time, the total length of belt 6 is fixed. When it is necessary to control the extension of the receiving surface of belt 6, the length of belt 6 needs to be redistributed. Therefore, it is necessary to activate the first and second linkage mechanisms to solve the above problems.

[0040] By controlling the extension and retraction of the piston rod of the electric push rod 20, the I-shaped bracket 7 is moved forward. The I-shaped bracket 7 drives the upper and lower transmission rollers 4 to move forward, and the upper and lower transmission rollers 4 drive the front end of the tape 6 to move forward as well, thereby lengthening the receiving surface of the tape 6. At the same time, the I-shaped bracket 7 drives the loading frame 8 and the extension plate 9 to move forward simultaneously, so that the upper ends of the guide rods 15 on the left and right sides enter the straight sections of the guide grooves 10 on the left and right sides. As the loading frame 8 and the extension plate 9 continue to move forward, the upper ends of the guide rods 15 on the left and right sides enter the inclined sections of the guide grooves 10 on the left and right sides in sequence. Under the action of the inclined sections, the guide rods 15 on the left and right sides move towards the side closer to the frame 1. The guide rods 15 drive the connecting seat 14 and the support roller 13 to move towards the side closer to the frame 1, and the end of the support roller 13 gradually enters the interior of the frame 1. As the loading frame 8 and extension plate 9 continue to move forward, the upper ends of the guide rods 15 on both sides successively disengage from the inclined sections of the guide grooves 10 on both sides. After this, the guide rods 15 on both sides no longer drive the connecting seat 14 and support roller 13 to move. When disengaging from the inclined sections of the guide grooves 10, the portion of the support roller 13 inside the frame 1 reaches its maximum length, supporting the newly added receiving surface of the conveyor belt 6 through the support rollers 13 on both sides. Simultaneously, the retaining ring 27 on the support roller 13 moves to the retaining post 31, and the outer end of the retaining post 31, under the action of the spring 29, engages with the retaining ring 27 of the support roller 13, thereby limiting the position of the support roller 13. Finally, the support rollers 13 on both sides approach each other and are fixed by the retaining ring, participating in the work for the first time. Together with the carrying roller 2, they form a complete support structure of "coal receiving section at the machine head + original conveying section," effectively supporting the continuously feeding conveyor belt 6 and preventing local collapse and excessive stress caused by the elongation of the conveyor belt 6 and the weight of the coal.

[0041] When the I-shaped bracket 7 moves forward, it drives the moving block 19 to move forward simultaneously via the connecting shaft 21 and the threaded rod 22. The moving block 19 also drives the adjusting roller 5 to move forward simultaneously. The forward movement of the I-shaped bracket 7 also drives the spur gear 24 to move forward synchronously. Since the spur gear 24 meshes with the rack 26, and the rack 26 is fixedly mounted on the frame 1, the spur gear 24 will begin to rotate under the action of the rack 26 during its forward movement. The spur gear 24 drives the driving bevel gear 25 to rotate, which in turn drives the driven bevel gear 23 to rotate. The driven bevel gear 23 drives the connecting shaft 21 to rotate, which in turn drives the threaded rod 22 to rotate. Since the threaded rod 22 is screwed to the moving block 19, the moving block 19 will slide forward relative to the threaded rod 22, meaning the moving block 19 will move forward relative to the I-shaped bracket 7. As the moving block 19 moves forward simultaneously with the I-shaped support 7, it will also move forward relative to the I-shaped support 7. The distance that the moving block 19 moves forward is twice the distance that the I-shaped support 7 moves forward. In other words, the distance that the adjusting roller 5 moves forward is twice the distance that the upper and lower transmission rollers 4 move forward. As a result, the length of the conveyor belt 6 between the adjusting roller 5 and the transmission roller 4 becomes shorter. The shortened length of the conveyor belt 6 between the adjusting roller 5 and the transmission roller 4 is compensated to the length of the conveyor belt 6 between the tail roller 3 and the transmission roller 4, thus completing the redistribution of the length of the conveyor belt 6.

[0042] After the unloading platform 17 at the tail end of the machine and the support material are unloaded, the electric push rod 20 reverses its direction, pulling the I-beam bracket 7 back to its initial position. The I-beam bracket 7, through the second linkage mechanism, drives the moving block 19 to also retreat to its initial position. The transmission roller 4 and adjusting roller 5 then return to their initial states, the extendable structure at the head end resets, the conveyor belt 6 returns to its initial conveying length, and the temporarily stored coal is conveyed to the tail end after the conveyor belt 6 restarts, thus restoring normal conveying. The I-beam bracket 7 also drives the loading frame 8 and extension plate 9 back to their initial positions. During the retraction of the loading frame 8 and extension plate 9, the first linkage mechanism drives the support rollers 13 on both sides to move in the opposite direction, thus returning them to the slot 12. During the return of the support rollers 13 to the slot 12, the retaining ring 27 on the support rollers 13 overcomes the elastic force on the retaining post 31 and disengages from the outer end of the retaining post 31, thereby releasing the retaining post 31 from limiting the support rollers 13.

[0043] At this time, the metal detector 16 outputs a shutdown signal, the conveyor restarts, and the transportation of support materials and coal can be carried out alternately or synchronously. The coal loading equipment and the conveyor resume coordinated operation and enter the next round of operation cycle.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A protective device for preventing iron objects from getting caught in a conveyor belt, characterized in that: The system includes a frame (1), with a tail roller (3) rotatably mounted inside the rear end of the frame (1). Two I-beam brackets (7) and two moving blocks (19) are slidably mounted at the front end of the frame (1). The moving blocks (19) are located on the side of the I-beam brackets (7) near the tail roller (3). Two vertically distributed transmission rollers (4) are rotatably mounted between the two I-beam brackets (7). An adjusting roller (5) is rotatably mounted between the two moving blocks (19). The conveyor belt (6) passes around the tail roller (3), the upper transmission roller (4), the adjusting roller (5), and the lower transmission roller (4) in sequence. A loading frame (8) is set between the upper ends of the two I-beam brackets (7). A fixed seat is fixedly mounted on the left and right sides of the front end of the frame (1). 11) Each fixed seat (11) has a row of support rollers (13) slidably arranged inside. A first linkage mechanism is provided between the support rollers (13) and the loading frame (8). When the loading frame (8) slides forward, the first linkage mechanism drives the two rows of support rollers (13) to extend into the frame (1) to support the tape (6). A second linkage mechanism is provided between the I-shaped bracket (7) on one side and the moving block (19). When the I-shaped bracket (7) moves back and forth, the second linkage mechanism drives the moving block (19) to move back and forth at the same time. The moving distances of the I-shaped bracket (7) and the moving block (19) are different. A discharge table (17) is provided inside the tape (6). A metal detector (16) is fixedly installed inside the end of the frame (1).

2. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: On the left and right side walls at the front end of the frame (1), there is a horizontally extending slide groove (18), and an I-shaped bracket (7) and a moving block (19) are slidably installed inside each slide groove (18).

3. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: The two ends of the upper drive roller (4) are hinged to the upper end of the end face of the two I-shaped brackets (7) inside the frame (1), and the two ends of the lower drive roller (4) are hinged to the lower end of the end face of the two I-shaped brackets (7) inside the frame (1); the adjusting roller (5) is located between the two drive rollers (4) on the side close to the tail roller (3).

4. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: The tape (6) extends forward after passing over the tail roller (3) upward, extends backward after passing over the upper drive roller (4) downward, extends forward after passing over the adjusting roller (5) downward, extends backward after passing over the lower drive roller (4) downward, and finally returns to the tail roller (3); a row of bearing rollers (2) is rotatably arranged between the inner walls of the left and right sides of the frame (1).

5. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: The first linkage mechanism includes an extension plate (9) and a guide groove (10); an extension plate (9) is fixedly installed on the lower side of the left and right ends of the loading frame (8), and the lower end face of the two extension plates (9) is in sliding contact with the upper end face of the two fixed seats (11); a guide groove (10) is provided on the lower end face of the two extension plates (9), and the guide groove (10) includes a straight section and an inclined section. The straight section is located in front of the inclined section, and the rear end of the straight section is connected to the front end of the inclined section; the straight section is kept horizontal front and back, and the rear end of the inclined section extends inclinedly towards the guide groove (10) on the other side.

6. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 5, characterized in that: The first linkage mechanism also includes a connecting seat (14) and a guide rod (15); a row of slots (12) are arranged equidistantly in front and behind each fixed seat (11), and one end of the slot (12) is open and connected to the inside of the frame (1); a horizontal sliding groove is provided on the upper end of each slot (12), and a connecting seat (14) is slidably provided on the inner side of each slot (12). A vertical guide rod (15) is fixedly provided on the upper end of the connecting seat (14), and the guide rod (15) is slidably inserted into the sliding groove. The upper ends of the guide rods (15) on the left and right sides correspond to the guide grooves (10) on the two sides respectively; a support roller (13) is rotatably provided on the end of the connecting seat (14) near the frame (1).

7. A protective device for preventing iron objects from being caught in a conveyor belt according to claim 6, characterized in that: A slot ring (27) is provided at one end of the support roller (13) near the connecting seat (14); a groove (28) is provided inside the opening at one end of the slot (12), and a slide plate (30) is slidably provided inside each groove (28), and a spring (29) is provided between the slide plate (30) and the inner bottom surface of the groove (28); a locking post (31) is fixedly provided at the center of the outer side of each slide plate (30), and the outer end of the locking post (31) is spherical and extends to the outside of the opening of the groove (28).

8. The protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: An electric push rod (20) is fixedly installed on one side of the outer wall of the frame (1), and the piston rod end of the electric push rod (20) is fixedly connected to the I-shaped bracket (7) on the same side.

9. A protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: The second linkage mechanism includes a connecting shaft (21), a threaded rod (22), a driving bevel gear (25), a driven bevel gear (23), a rack (26), and a spur gear (24). A connecting shaft (21) is rotatably mounted on one of the I-shaped brackets (7), and a coaxial threaded rod (22) is fixedly mounted at the rear end of the connecting shaft (21). The threaded rod (22) is screwed to the moving block (19) on the same side. A driven bevel gear (23) is fixedly mounted at the front end of the connecting shaft (21). A spur gear (24) is rotatably mounted at the front end of the I-shaped bracket (7). A rack (26) is fixedly mounted on the outer wall of the frame (1), and the rack (26) meshes with the spur gear (24). A driving bevel gear (25) is fixedly mounted on the upper end of the spur gear (24), and the driving bevel gear (25) meshes with the driven bevel gear (23).

10. A protective device for preventing iron objects from being caught in a conveyor belt according to claim 1, characterized in that: The unloading platform (17) is located at the bottom inside the conveyor belt (6); the metal detector (16) is located at the upper rear end inside the conveyor belt (6).

Images