Mine scraper conveyor with anti-unilateral overload function

Abstract

This invention belongs to the field of mining conveying technology, specifically a mining scraper conveyor with anti-unilateral overload function. It includes: two pusher plates, each laterally movable on one side of a scraper chain, capable of pushing material to the opposite side; pressure plates, corresponding to the two pusher plates and vertically movable on both sides of the scraper chain, the downward movement of the pressure plates causing the pusher plates on the same side to move to the opposite side; contact heads, vertically movable above the two pressure plates, the downward movement of the contact heads causing the pressure plates to move downward; and balance plates, corresponding to the two pusher plates and slidably positioned in front of the scraper plates on both sides. During conveying, the balance plates can move backward under the pressure of the material. When the two balance plates are staggered, the balance plates can cause the contact heads to move upward. This invention has the advantage of pushing material from the overloaded side to the opposite side, completing the unloading of material from the overloaded side and replenishing material from the unloaded side.

Description

Technical Field

[0001] This invention relates to the field of mining conveying technology; specifically, this invention relates to a mining scraper conveyor with a function to prevent unilateral overload. Background Technology

[0002] my country's coal mining industry has introduced fully mechanized longwall mining equipment and technology, leading to the gradual development of longwall mining technology and equipment. Longwall mining technology has become the mainstream technology in my country's coal mining. Scraper conveyors are key transport equipment in coal mining, used for long-distance coal transport, primarily in longwall mining faces. Their working principle involves a scraper chain pulling scrapers within the trough, continuously transporting coal cut by the mining machine to a transfer conveyor. However, under complex operating conditions, overload risks remain, especially unilateral overload. This can cause excessive load on one scraper, resulting in uneven stress on both sides and localized accumulation, potentially leading to scraper deformation, accelerated wear, or blockages, thus shortening the equipment's lifespan. Summary of the Invention

[0003] In view of this, the present invention provides a mining scraper conveyor with a function to prevent unilateral overload, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objective, the present invention provides a mining scraper conveyor with a function of preventing unilateral overload, comprising: two pusher plates, which are respectively arranged laterally on both sides of the scraper chain and are capable of pushing materials to the opposite side;

[0005] The pressure plate is set in correspondence with the two pusher plates and is vertically adjustable on both sides of the scraper chain. The downward displacement of the pressure plate can drive the pusher plate on the same side to move to the opposite side.

[0006] The contact is vertically and can be positioned above the two pressure plates. The downward displacement of the contact can drive the pressure plates to move downward.

[0007] A balance plate is set in correspondence with two pusher plates and is slidably positioned in front of the scrapers on both sides. A return spring is set between the balance plate and the scrapers. During the conveying process, the balance plate can be displaced backward by the pressure of the material. When the two balance plates are staggered front and back, the balance plate can drive the contact head to move upward.

[0008] In the aforementioned mining scraper conveyor with anti-unilateral overload function, optionally, a first telescopic rod is rotatably connected below the contact, a rotating sleeve is sleeved on the outer surface of the first telescopic rod, a fixed sleeve is sleeved on the outer surface of the rotating sleeve, a spiral groove is opened inside the fixed sleeve, the rotating sleeve can slide with the spiral groove, and the rotating sleeve can drive the first telescopic rod to move spirally upward along the spiral groove.

[0009] The top of the contact is inclined on the side facing forward. A row of crossbars fixed to the conveyor trough is provided above the contact. The inclined surface of the contact can contact the crossbars. The contact can be squeezed downward by the crossbars to compress the first telescopic rod.

[0010] A pressure rod is fixedly installed on both the left and right sides of the contact. The pressure plate is located at the bottom of the pressure rod and slides in the front-back direction with the pressure rod. When the contact moves downward, it can drive the pressure plate to move downward through the pressure rod.

[0011] In the mining scraper conveyor with anti-unilateral overload function as described above, optionally, a threaded rod is provided on both sides of the scraper chain, and the tail of the pusher plate is threadedly connected to the threaded rod.

[0012] Both sides of the scraper chain are provided with a first speed change assembly, which is used to connect the pressure plate and the threaded rod on the same side. When the pressure plate moves downward, the threaded rod on the same side can be driven to rotate through the first speed change assembly.

[0013] In the aforementioned mining scraper conveyor with anti-unilateral overload function, optionally, a fixed tube is slidably sleeved inside the rotating sleeve, and the rotating sleeve and the fixed tube are slidably engaged in the height direction. An intermediate gear is fixedly connected to the bottom of the fixed tube, and first racks meshing with the intermediate gear are provided on both the left and right sides of the intermediate gear. A second speed change assembly is provided below each of the two first racks for connecting the first racks on the same side and the balance plate. When the two balance plates are staggered, the rotation of the intermediate gear can drive the rotating sleeve to rotate, causing the rotating sleeve to drive the contact to move upward.

[0014] In the aforementioned mining scraper conveyor with anti-unilateral overload function, optionally, a second telescopic rod capable of retracting back and forth is provided above each of the two first racks, a lifting pipe is provided above the front end of the second telescopic rod, a lifting rod is sleeved inside the lifting pipe, the top of the lifting rod is fixedly connected to the bottom of the pressure plate, an extension block is fixedly provided on the opposite face of the front ends of the two second telescopic rods, and a push block is fixedly provided above each of the two first racks, the rear side of the push block can contact the front side of the extension block on the same side;

[0015] During the process of the two balance plates switching to a staggered state under material resistance, the first gear corresponding to the balance plate on the rear side pushes the extension block behind it to compress the second telescopic rod, causing the pressure plate above it to move backward.

[0016] In the aforementioned mine scraper conveyor with unilateral overload protection function, optionally, the first speed change component includes:

[0017] The first gear is fixedly installed at the opposite ends of the threaded rods on both the left and right sides;

[0018] The second rack is vertically adjustable and positioned below the pressure plate, with its top abutting against the bottom of the pressure plate.

[0019] The first gear set is provided on both the left and right sides of the scraper chain, and the front side of the first gear set meshes with the first gear on the same side, and the rear side of the first gear set meshes with the second rack on the same side.

[0020] A fixing plate is disposed on the rear side of the second rack and slides with the second rack in the height direction. A spring is disposed between the fixing plate and the second rack.

[0021] In the aforementioned mine scraper conveyor with anti-unilateral overload function, optionally, the second speed change component includes:

[0022] The third rack is fixedly installed at the bottom of both the left and right balance plates;

[0023] The second gear set is located in front of the third rack, and the first rack is located above the second gear set, for connecting the first rack and the third rack on the same side.

[0024] In the mining scraper conveyor with anti-unilateral overload function as described above, optionally, a limit rod is provided below the threaded rod, the top of the limit rod can contact the bottom of the pusher plate, a limit sleeve is sleeved on the limit rod, and the pusher plate is sleeved inside the limit sleeve.

[0025] In the mining scraper conveyor with anti-unilateral overload function as described above, optionally, the rear pushing parts of the pusher plates on the left and right sides are staggered.

[0026] In the aforementioned mining scraper conveyor with anti-unilateral overload function, optionally, a baffle is provided at the top of the scraper chain, and the rear end of the baffle passes through the balance plate and is fixedly connected to the scraper.

[0027] The present invention provides a mining scraper conveyor with a function to prevent unilateral overload. It uses two balance plates on the left and right to detect whether unilateral overload occurs. After unilateral overload occurs, the contact can extend upward and be squeezed downward by the cross bar above the scraper, which drives the pusher plate on the overloaded side to push the material to the opposite side, thereby realizing unloading the unilateral overloaded side and replenishing the non-overloaded side. Attached Figure Description

[0028] The disclosure of this invention will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a partial structural diagram of the present invention.

[0031] Figure 3 This is a partial structural diagram of one section of the present invention under unilateral overload.

[0032] Figure 4 This is a top view of one section of the present invention under unilateral overload.

[0033] Figure 5 This is a schematic diagram of the connection structure of the first transmission component of the present invention inside the protective housing.

[0034] Figure 6 This is a schematic diagram of the connection structure of the second speed-changing component of the present invention.

[0035] Figure 7 This is a schematic diagram of the connection structure of the intermediate gear, fixed tube, and rotating sleeve without the spring inside, according to the present invention.

[0036] Figure 8 This is a schematic diagram of the internal connection structure of the rotating sleeve and the fixed sleeve of the present invention.

[0037] Reference numerals: 1. Pusher plate; 2. Scraper chain; 2-1. Scraper; 3. Pressure plate; 4. Contact head; 5. Balance plate; 6. Protective shell; 7. First telescopic rod; 8. Rotating sleeve; 9. Fixing sleeve; 9-1. Spiral groove; 10. Crossbar; 11. Pressure rod; 12. Threaded rod; 13. First speed change assembly; 13-1. First gear; 13-2. Second rack; 13-3. First gear set; 13-4. Fixing plate; 14. Intermediate gear; 14-1. Fixing tube; 15. First rack; 16. Second speed change assembly; 16-1. Third rack; 16-2. Second gear set; 17. Second telescopic rod; 18. Lifting tube; 19. Lifting rod; 20. Extension block; 21. Push block; 22. Limiting rod; 23. Limiting sleeve; 24. Baffle. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0039] like Figures 1 to 8 As shown, a typical embodiment of the present invention provides a mining scraper conveyor with anti-unilateral overload function, including a pusher plate 1, a pressure plate 3, a contact 4, and a balance plate 5.

[0040] There are two pusher plates 1, which are laterally movable on both sides of the scraper chain 2. They can push the material to the opposite side. When a single-sided overload occurs during the transportation of the mining conveyor, the material on the overloaded side is more than the material on the other side. The pusher plates 1 can push the material on the overloaded side to the opposite side, completing the unloading of the overloaded side and the replenishment of the non-overloaded side, thus achieving the effect of preventing single-sided overload.

[0041] The pressure plate 3 is set in a one-to-one correspondence with the two pusher plates 1, and is set on both sides of the scraper chain 2 in a height-adjustable manner. When the pressure plate 3 moves downward, it can drive the pusher plate 1 on the same side to move to the opposite side.

[0042] The contact 4 is vertically mounted above the two pressure plates 3. When the contact 4 moves downward, it can drive the two pressure plates 3 to move downward, and through the pressure plates 3, it can drive the pusher plate 1 to move to the opposite side to push the material.

[0043] The balance plate 5 is set in a one-to-one correspondence with the two pusher plates 1 and is slidably set in front of the scrapers 2-1 on both sides. There is a return spring between the balance plate 5 and the scraper 2-1. During the conveying process, the balance plate 5 can be displaced backward by the pressure of the material. When a unilateral overload occurs, the left and right balance plates 5 are staggered front and back, and the balance plate 5 can drive the contact 4 to move upward.

[0044] In a relatively specific embodiment, a protective shell 6 is fixedly installed on the scraper chain 2, and the contact 4 is located above the protective shell 6. A first telescopic rod 7 is rotatably connected below the contact 4. A rotating sleeve 8 is sleeved on the outer surface of the first telescopic rod 7, and a fixing sleeve 9 is sleeved on the outer surface of the rotating sleeve 8. The fixing sleeve 9 is fixedly installed on the top of the protective shell 6. A spiral groove 9-1 is opened inside the fixing sleeve 9. The rotating sleeve 8 can slide and cooperate with the spiral groove 9-1. The rotating sleeve 8 can drive the first telescopic rod 7 to move spirally upward along the spiral groove 9-1, so that the contact 4 can move upward.

[0045] The top of the contact 4 has a sloping side facing forward. Above the contact 4, there is a row of crossbars 10 fixed on the conveyor trough. The crossbars 10 are fixedly installed on the side walls on both sides. The height of the crossbars 10 is higher than that of the scraper 2-1. During the process of the contact 4 moving upward to the highest position, the sloping side of the contact 4 can contact the crossbars 10. The contact 4 can be squeezed downward by the crossbars 10 to compress the first telescopic rod 7.

[0046] A pressure rod 11 is fixedly installed on both the left and right sides of the contact 4. The pressure plate 3 is located at the bottom of the pressure rod 11 and slides in the front and back direction with the pressure rod 11. When the contact 4 moves downward, it can drive the pressure plate 3 to move downward through the pressure rod 11. When a unilateral overload occurs, the contact 4 can move upward as a unilateral overload detection device, and can be squeezed downward by the cross bar 10 to drive the pressure plate 3 to move downward, so that the pusher plate 1 can move. The pusher plate 1 pushes the material on the side where the unilateral overload occurs to the other side.

[0047] In a relatively specific embodiment, a threaded rod 12 is provided on both sides of the scraper chain 2. The threaded rods 12 on both sides are rotatably mounted on the protective shell 6. The tail of the pusher plate 1 is threadedly connected to the threaded rod 12. The rotation of the threaded rod 12 can drive the pusher plate 1 on the same side to move laterally.

[0048] Both sides of the scraper chain 2 are provided with a first speed change assembly 13, which is used to connect the pressure plate 3 and the threaded rod 12 on the same side. The first speed change assembly 13 is installed inside the protective shell 6, which can protect the first speed change assembly 13 and prevent material from entering the first speed change assembly 13 and affecting the first speed change assembly 13. When the pressure plate 3 moves downward, it can drive the threaded rod 12 on the same side to rotate through the first speed change assembly 13, so that the pusher plate 1 can move laterally.

[0049] In a relatively specific embodiment, a fixed tube 14-1 is slidably sleeved inside the rotating sleeve 8. The rotating sleeve 8 and the fixed tube 14-1 are slidably fitted in the height direction. An intermediate gear 14 is fixedly connected to the bottom of the fixed tube 14-1. A first rack 15 is provided on both the left and right sides of the intermediate gear 14 and meshes with it. A second speed change assembly 16 is provided below each of the two first racks 15 for connecting the first rack 15 on the same side and the balance plate 5. When the two balance plates 5 are staggered, the rotation of the intermediate gear 14 can drive the rotating sleeve 8 to rotate, so that the rotating sleeve 8 drives the contact 4 to move upward, thereby realizing the balance plate 5 controlling the lifting and lowering of the contact 4.

[0050] In a relatively specific embodiment, a second telescopic rod 17 capable of retracting back and forth is provided above each of the two first racks 15. A lifting tube 18 is provided above the front end of the second telescopic rod 17, and a lifting rod 19 is sleeved inside the lifting tube 18. The top of the lifting rod 19 is fixedly connected to the bottom of the pressure plate 3. An extension block 20 is fixedly provided on the opposite front ends of the two second telescopic rods 17. A push block 21 is fixedly provided above each of the two first racks 15. The rear side of the push block 21 can contact the front side of the extension block 20 on the same side. The rear end of the second telescopic rod 17 is fixedly installed on the top of the protective shell 6. There is a partition above the second telescopic rod 17. The length of the partition is greater than the extension length of the second telescopic rod 17 and can move back and forth with the lifting tube 18 to protect the second telescopic rod 17. In the initial state, the second telescopic rod 17 is in its longest state. The lifting rod 19 is located at the front of the pressure plate 3 at the bottom of the pressure plate 3. The pressure plate 3 and the pressure rod 11 are slidably connected.

[0051] During the process of the two balance plates 5 switching to a staggered state under the resistance of materials, the first gear 13-1 corresponding to the balance plate 5 on the rear side pushes the extension block 20 behind it to compress the second telescopic rod 17, causing the pressure plate 3 above it to move backward.

[0052] In a relatively specific embodiment, the first transmission assembly 13 includes: a first gear 13-1, a second rack 13-2, a first gear set 13-3, and a fixing plate 13-4.

[0053] The first gear 13-1 is fixedly installed at the opposite ends of the threaded rods 12 on both the left and right sides. The first gear 13-1 drives the threaded rods 12 to rotate. The second rack 13-2 is vertically adjustable and installed below the pressure plate 3. The second rack 13-2 is installed inside the protective shell 6 and located on the front side of the protective shell 6. The top of the second rack 13-2 can abut against the bottom of the pressure plate 3. When the pressure plate 3 is pushed backward by the first rack 15, the rear end of the pressure plate 3 can move to the top of the second rack 13-2 and abut against the second rack 13-2. The contact 4 can drive the second rack 13-2 to move downward by moving the pressure plate 3 downward through the pressure rod 11.

[0054] One first gear set 13-1 is provided on each of the left and right sides of the scraper chain 2. Both first gear sets 13-3 are rotatably installed inside the protective shell 6. The front side of the first gear set 13-3 meshes with the first gear 13-1 on the same side, and the rear side meshes with the second rack 13-2 on the same side. This is used to connect the first gear 13-1 and the second rack 13-2 and increase the transmission ratio between the first gear 13-1 and the second rack 13-2. When the second rack 13-2 descends, the first gear 13-1 drives the pusher plate 1 to move to the opposite side through the threaded rod 12. When the second rack 13-2 rises, the first gear 13-1 drives the pusher plate 1 to move outward through the threaded rod 12.

[0055] The fixing plate 13-4 is located on the rear side of the second rack 13-2 and slides with the second rack 13-2 in the height direction. A spring is provided between the fixing plate 13-4 and the second rack 13-2. When the second rack 13-2 loses the pressure of the pressure plate 3, the second rack 13-2 can be reset to the highest position by the spring, so that the pressure plate 3 can continue to press down on the second rack 13-2 next time, causing the pusher plate 1 to move to the opposite side and push the material to the opposite side.

[0056] When a unilateral overload occurs, the first rack 15 located on the rear side compresses the second telescopic rod 17, causing the pressure plate 3 to move backward until it abuts against the top of the second rack 13-2. The pressure plate 3 located on the front side remains in position and does not contact the second rack 13-2 on the same side. When the subsequent contact 4 is pressed downward by the crossbar 10, both pressure plates 3 move downward simultaneously. The pressure plate 3 located on the rear side moves downward and presses against the second rack 13-2. The downward movement of the second rack 13-2 causes the pusher plate 1 on the same side as the rear pressure plate 3 to push material to the opposite side, allowing the material in front of the rear balance plate 5 to be pushed to the opposite side. Since there is more material at the front of the rear balance plate 5... The material on the front balance plate 5 is on the overloaded side of the rear balance plate 5. This achieves the effect of unloading the overloaded side and replenishing the unloaded side, completing the self-correction effect until the two balance plates 5 are aligned front to back and the two first racks 15 are aligned front to back. The middle gear 14 returns to its initial position, the rotating sleeve 8 rotates downward to reset, and the contact 4 moves downward. At the same time, the pressure plate 3 on the rear side resets due to the forward displacement of the corresponding first rack 15. The second telescopic rod 17 on the same side releases pressure forward, the pressure plate 3 separates from the second rack 13-2, and the second rack 13-2 resets upward under the action of the spring, driving the threaded rod 12 to reverse, so that the pusher plate 1 resets.

[0057] In a relatively specific embodiment, the second transmission assembly 16 includes: a third rack 16-1 and a second gear set 16-2.

[0058] The third rack 16-1 is fixedly installed at the bottom of the balance plates 5 on both the left and right sides. The second gear set 16-2 is located in front of the third rack 16-1. The first rack 15 is located above the second gear set 16-2 and is used to connect the first rack 15 and the third rack 16-1 on the same side. It can also increase the transmission ratio between the first rack 15 and the third rack 16-1. The displacement distance of the first rack 15 is greater than the displacement distance of the third rack 16-1, so that the rotation angle of the intermediate gear 14 is larger, making it easier for the contact 4 to move upward to the highest position.

[0059] In a relatively specific embodiment, a limiting rod 22 is provided below the threaded rod 12. The top of the limiting rod 22 can contact the bottom of the pusher plate 1. A limiting sleeve 23 is sleeved on the limiting rod 22. The pusher plate 1 is sleeved in the limiting sleeve 23. The limiting sleeve 23 can prevent the pusher plate 1 from rotating upward, while the limiting rod 22 can prevent the pusher plate 1 from rotating downward. The pusher plate 1 can move laterally stably under the action of the threaded rod 12.

[0060] In a relatively specific embodiment, the rear pusher portions of the left and right pusher plates 1 are staggered, which prevents the material between the two pusher plates 1 from being squeezed during the process of the pusher plate 1 pushing the material to the opposite side, allowing the material to flow better. During the reset process after the pusher plate 1 finishes pushing the material, the material at the front end of the pusher plate 1 can flow back, so that there is material to push when a unilateral overload occurs next time.

[0061] In a relatively specific embodiment, a baffle 24 is provided at the top of the scraper chain 2. The rear end of the baffle 24 passes through the balance plate 5 and is fixedly connected to the scraper 2-1. The front end of the baffle 24 is fixedly connected to the rear end of the protective shell 6. The baffle 24 can prevent material from entering the scraper chain 2.

[0062] The technical scope of this invention is not limited to the contents of the above specification. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the scope of this invention.

Claims

1. A mining scraper conveyor with anti-unilateral overload function, characterized in that, include: There are two pusher plates (1), which can be moved laterally on both sides of the scraper chain (2) and can push the material to the opposite side. A pressure plate (3) is set one-to-one with two pusher plates (1) and is vertically adjustable on both sides of the scraper chain (2). When the pressure plate (3) moves downward, it can drive the pusher plate (1) on the same side to move to the opposite side. A threaded rod (12) is set on both sides of the scraper chain (2), and the tail of the pusher plate (1) is threadedly connected to the threaded rod (12). A first speed change assembly (13) is set on both sides of the scraper chain (2) to connect the pressure plate (3) and the threaded rod (12) on the same side. When the pressure plate (3) moves downward, it can drive the threaded rod (12) on the same side to rotate through the first speed change assembly (13). The contact (4) is vertically and vertically positioned above the two pressure plates (3). The downward displacement of the contact (4) can drive the pressure plates (3) to move downward. A first telescopic rod (7) is rotatably connected below the contact (4). A rotating sleeve (8) is fitted on the outer surface of the first telescopic rod (7). A fixed sleeve (9) is fitted on the outer surface of the rotating sleeve (8). A spiral groove (9-1) is opened inside the fixed sleeve (9). The rotating sleeve (8) can slide with the spiral groove (9-1). The rotating sleeve (8) can drive the first telescopic rod (7) to move upward along the spiral groove (9-1). The top of the contact (4) is inclined on the side facing forward. A row of crossbars (10) fixed on the conveyor trough is provided above the contact (4). The inclined surface of the contact (4) can contact the crossbars (10). The contact (4) can be squeezed downward by the crossbars (10) to compress the first telescopic rod (7). A pressure rod (11) is fixedly provided on both the left and right sides of the contact (4). The pressure plate (3) is located at the bottom of the pressure rod (11) and slides in the front-back direction with the pressure rod (11). When the contact (4) moves downward, it can drive the pressure plate (3) to move downward through the pressure rod (11). The balance plate (5) is set in correspondence with the two pusher plates (1) and is slidably set in front of the scrapers (2-1) on both sides. A reset spring is set between the balance plate (5) and the scraper (2-1). During the conveying process, the balance plate (5) can be displaced backward by the pressure of the material. When the two balance plates (5) are staggered in front and behind, the balance plate (5) can drive the contact (4) to move upward.

2. A mining scraper conveyor with anti-unilateral overload function as described in claim 1, characterized in that, The rotating sleeve (8) is slidably fitted with a fixed tube (14-1). The rotating sleeve (8) and the fixed tube (14-1) slide in the height direction. The bottom of the fixed tube (14-1) is fixedly connected with an intermediate gear (14). The left and right sides of the intermediate gear (14) are provided with first racks (15) that mesh with it. The two first racks (15) are provided with second gear transmission components (16) below them, which are used to connect the first racks (15) on the same side and the balance plate (5). When the two balance plates (5) are staggered, the rotation of the intermediate gear (14) can drive the rotating sleeve (8) to rotate, so that the rotating sleeve (8) drives the contact (4) to move upward.

3. A mining scraper conveyor with anti-unilateral overload function as described in claim 2, characterized in that, Above each of the two first racks (15) is a second telescopic rod (17) that can retract back and forth. Above the front end of the second telescopic rod (17) is a lifting tube (18). Inside the lifting tube (18) is a lifting rod (19). The top of the lifting rod (19) is fixedly connected to the bottom of the pressure plate (3). An extension block (20) is fixedly provided on the opposite front end of each of the two second telescopic rods (17). A push block (21) is fixedly provided above each of the two first racks (15). The rear side of the push block (21) can contact the front side of the extension block (20) on the same side. During the process of the two balance plates (5) switching to a staggered state under the material resistance, the first gear (13-1) corresponding to the balance plate (5) located on the rear side compresses the second telescopic rod (17) by pushing the extension block (20) behind it backward, so that the pressure plate (3) above it is displaced backward.

4. A mining scraper conveyor with anti-unilateral overload function as described in claim 3, characterized in that, The first transmission assembly (13) includes: The first gear (13-1) is fixedly installed at the opposite ends of the threaded rods (12) on both the left and right sides; The second rack (13-2) is vertically adjustable below the pressure plate (3), and the top of the second rack (13-2) can abut against the bottom of the pressure plate (3); The first gear set (13-3) is provided on both the left and right sides of the scraper chain (2), and the front side of the first gear set (13-3) meshes with the first gear (13-1) on the same side, and the rear side of the first gear set (13-3) meshes with the second rack (13-2) on the same side. A fixing plate (13-4) is disposed on the rear side of the second rack (13-2) and slides with the second rack (13-2) in the height direction. A spring is provided between the fixing plate (13-4) and the second rack (13-2).

5. A mining scraper conveyor with anti-unilateral overload function as described in claim 4, characterized in that, The second transmission assembly (16) includes: The third rack (16-1) is fixedly installed at the bottom of the balance plates (5) on both the left and right sides; The second gear set (16-2) is located in front of the third rack (16-1), and the first rack (15) is located above the second gear set (16-2) for connecting the first rack (15) and the third rack (16-1) on the same side.

6. A mining scraper conveyor with anti-unilateral overload function as described in claim 4, characterized in that, A limiting rod (22) is provided below the threaded rod (12). The top of the limiting rod (22) can contact the bottom of the pusher plate (1). A limiting sleeve (23) is sleeved on the limiting rod (22), and the pusher plate (1) is sleeved inside the limiting sleeve (23).

7. A mining scraper conveyor with anti-unilateral overload function as described in claim 1, characterized in that, The rear pusher sections of the pusher plates (1) on the left and right sides are staggered.

8. A mining scraper conveyor with anti-unilateral overload function as described in claim 1, characterized in that, The top of the scraper chain (2) is provided with a baffle (24), and the rear end of the baffle (24) passes through the balance plate (5) and is fixedly connected to the scraper (2-1).

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