Scraper machine, chain tightening device of scraper machine and using method of chain tightening device

Abstract

The invention belongs to the technical field of conveying equipment, particularly relates to a scraper machine, a chain tightening device of the scraper machine and a use method of the chain tightening device, and aims to solve the problems that a scraper plate of a traditional scraper machine is unstable in fixation and insufficient in limiting, and a transmission chain is complex in tension adjustment and easy to loosen. A guide sliding rail is arranged to guarantee stability; a limiting structure is arranged, stability of a scraping plate is guaranteed through cooperation of an inserting rod and an annular limiting groove and assistance of a rolling wheel, the chain tightening device is provided with two box bodies I, a connecting plate and a positioning fixing rod are arranged at the head and the tail of a transmission chain, adjusting structures such as a bidirectional spiral lead screw are arranged in the box bodies I, and the positioning fixing rod is controlled to move to adjust tension through a rotating rod and the like; a one-way ratchet gear and a brake operating rod are arranged to prevent reverse rotation; the elastic sleeve is matched with the linear displacement rod, tension balance of the two transmission chains is guaranteed, and the device is mainly used for stable conveying of materials.

Description

Technical Field

[0001] This invention relates to the field of conveying equipment technology, and in particular to a scraper conveyor, a chain tightening device for the scraper conveyor, and a method of using the scraper conveyor. Background Technology

[0002] In industrial production, scraper conveyors are widely used as important material conveying equipment in mining, chemical, and grain processing industries. Their main function is to transport bulk materials from one location to another, offering advantages such as large conveying capacity, stable operation, and strong adaptability.

[0003] Traditional scraper conveyors typically consist of a casing, drive shaft, sprockets, drive chain, and scraper blades. Material enters through the inlet at the top of the casing, is propelled along the bottom by the scraper blades, and finally exits through the outlet at the bottom. However, in actual operation, traditional scraper conveyors have some problems: On the one hand, the fixing method of the scraper blade is not stable enough. During long-term operation, due to the impact and friction of the material, the connecting bolts between the scraper blade and the drive chain are prone to loosening, causing the scraper blade to detach from the drive chain, affecting the normal operation of the scraper conveyor, and may even cause equipment failure. In traditional scraper conveyors, the stability of the scraper blade is poor during operation, especially when conveying materials, it is prone to shaking, affecting the conveying effect; On the other hand, adjusting the tension of the drive chain is inconvenient. During operation, the tension of the drive chain changes due to factors such as wear and temperature variations. If the tension is too high, it will increase the wear of the transmission components and reduce the service life of the equipment; if the tension is too low, it may cause the drive chain to skip teeth, affecting the conveying efficiency. Traditional tension adjustment methods usually require adjusting the position of the drive shaft and sprockets, which is complicated to operate and makes it difficult to ensure the tension balance of the two drive chains.

[0004] Therefore, it is necessary to improve the existing scraper conveyor to enhance its operational stability and reliability. Summary of the Invention

[0005] The purpose of this invention is to solve the shortcomings of existing scraper machines, such as unstable fixing and insufficient limiting, and complex and easy loosening of transmission chain tension adjustment. The invention proposes a scraper machine and a chain tightening device for the scraper machine, as well as its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A scraper conveyor, comprising: The rectangular casing has a material inlet on one side of the top and a material outlet on the side of the bottom away from the material inlet. Two drive shafts are rotatably connected inside a rectangular housing, and two sprockets are fixedly sleeved on the outer wall of each drive shaft. Two transmission chains mesh with two adjacent sprockets, and the two sprockets meshing with the same transmission chain are located on two separate transmission shafts. Multiple scraper blades are located on one side of two drive chains, and the scraper blades are fixedly connected to the two drive chains respectively through two U-shaped fixed brackets; The limiting structure includes annular limiting grooves formed on the inner walls of both sides of the rectangular housing and two insertion rods disposed within the scraper body. The insertion rods elastically abut against the inner wall of the scraper body via compression spring II43, and the ends of the insertion rods extend into the annular limiting grooves for sliding engagement. When the scraper body is conveying material below the sprocket, the insertion rods maintain engagement with the annular limiting grooves under the action of compression spring II43, preventing the scraper body from detaching from the U-shaped fixed bracket.

[0007] In one possible design, the U-shaped fixing bracket is fixedly connected to the scraper body by bolts, and the inner walls on both sides of the U-shaped fixing bracket are provided with guide rails. The side of the scraper body slides with the guide rails to limit the lateral displacement of the scraper body.

[0008] In one possible design, the limiting structure further includes a sliding baffle that is slidably disposed in the hollow cavity of the scraper body. The top of the sliding baffle is connected to the top of the hollow cavity via a tension spring I. A linear sliding rod extending to the bottom of the scraper body is fixed at the bottom of the sliding baffle, and a rolling wheel is rotatably connected to the bottom end of the linear sliding rod. When the scraper body moves to the bottom of the sprocket, the rolling wheel abuts against the inner wall of the bottom of the rectangular housing, forcing the plug-in rod to remain extended.

[0009] In one possible design, one end of the plug rod is provided with a trapezoidal guide groove via a traction rod, and a push rod that cooperates with the trapezoidal guide groove is fixed at the bottom of the sliding baffle; when the scraper body is above the sprocket, the linear sliding rod is pulled upward, and the push rod squeezes the trapezoidal guide groove to retract the plug rod and release the cooperation with the annular limiting groove.

[0010] The chain tensioning device of the scraper conveyor is used to adjust the tension of the drive chain in the scraper conveyor described above, including: Two boxes, I, are located on either side of the transmission chain; Two positioning and fixing rods slide through the connecting plates at both ends of the transmission chain; The adjustment structure includes a bidirectional spiral screw rotatably connected to two housings I, and two movable bases threadedly connected to the positive and negative thread sections of the bidirectional spiral screw; the movable bases are fixedly connected to the ends of the positioning and fixing rods; when the bidirectional spiral screw is rotated, the two movable bases drive the positioning and fixing rods to move towards each other, tightening the transmission chain.

[0011] In one possible design, the ends of two bidirectional helical screws extend into housing II and are fixed with bevel gear I. Housing II is provided with a rotating rod, on which two bevel gears II that mesh with bevel gear I are fixed. One end of the rotating rod is provided with a hexagonal locking groove. A one-way ratchet is fixedly sleeved on the outer wall of the rotating rod. Housing II is provided with a brake operating rod that elastically abuts against the one-way ratchet through a tension spring II to prevent the bidirectional helical screws from reversing.

[0012] In one possible design, a straight sliding groove is formed on the side wall of the box body I, and the end of the positioning and fixing rod slides through the straight sliding groove; foldable protective bellows covers are provided on the inner walls of both sides of the straight sliding groove, and the inner end of the foldable protective bellows covers is fixed to the side wall of the positioning and fixing rod to close the straight sliding groove.

[0013] In one possible design, an elastic sleeve is also included, in which two linear displacement rods are slidably connected. The inner ends of the two linear displacement rods are connected by a compression spring I, and the outer ends are provided with hexagonal positioning grooves. The ends of the two rotating rods are respectively fixed with hexagonal operating rods that are inserted into the hexagonal positioning grooves. Pushing the two linear displacement rods to compress the spring I can make the hexagonal positioning grooves simultaneously engage the two hexagonal operating rods.

[0014] In one possible design, a rotating rod drives bevel gear I and bevel gear II to rotate synchronously, causing two bidirectional helical screws to rotate and move two positioning and fixing rods at equal distances to balance the tension of the transmission chain.

[0015] The method of using the chain tensioning device of the scraper conveyor in this application includes the following steps: S1. Connect the hexagonal wrench to the hexagonal locking slot on the rotating rod to prepare to drive the rotating rod to rotate. S2. Turn the hex wrench to drive the rotating rod. The rotating rod drives two double-sided screw rods to rotate through the cooperation of a pair of bevel gears. During this process, the rotating rod drives the one-way ratchet to rotate. The one-way ratchet and the brake lever cooperate with each other under the action of the tension spring to form a one-way self-locking mechanism, preventing the rotating rod from rotating in the opposite direction, thereby ensuring the stability of tension control. S3. The rotation of the bidirectional helical screw drives the two movable bases on it to move towards each other. S4. The movable base drives the positioning and fixing rod to move, and the positioning and fixing rod then pulls the two ends of the transmission chain closer to each other through the connecting plate, thereby completing the tension tightening operation of the transmission chain. S5. When it is necessary to adjust the tension of the two transmission chains synchronously, push the two linear displacement rods towards the middle to compress the spring, so that the hexagonal positioning groove at one end of each linear displacement rod aligns with the corresponding hexagonal operating rod, thereby realizing the mechanical connection of the two rotating rods. S6. Drive one of the rotating rods to rotate, and drive the other rotating rod to rotate synchronously through the connected linkage device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, when the scraper body is conveying raw materials, the sliding cooperation between the plug rod and the annular limiting groove can limit the scraper body, preventing the bolts between the U-shaped fixing bracket and the scraper body from loosening due to long-term use of the scraper body, which would cause the scraper body to separate from the U-shaped fixing bracket. This ensures that the plug rod and the annular limiting groove limit the scraper body, allowing the scraper body to smoothly convey raw materials. In this invention, when the scraper body is located below the sprocket and conveys the raw material to the inner wall of the bottom of the rectangular housing, the rolling wheel abuts against the inner wall of the bottom of the rectangular housing, thereby limiting the linear sliding rod. This allows the insertion rod to extend into the annular limiting groove under the compression spring II43, ensuring that the insertion rod and the annular limiting groove restrict the scraper body. Conversely, by pulling the linear sliding rod, the push rod is extended into the trapezoidal guide groove, which can move the insertion rod out of the annular limiting groove, thereby releasing the restriction on the scraper body and facilitating the disassembly of the scraper body later. In this invention, connecting plates are bolted to both sides of the beginning and end of the transmission chain. When the tension of the transmission chain needs to be tightened, the bidirectional spiral screw is driven to rotate. The bidirectional spiral screw drives two movable bases to move towards each other. The movable bases drive the positioning and fixing rods to move. In turn, the connecting plates control the beginning and end of the transmission chain to move closer together, thereby completing the tension control. The operation is simple and the tension adjustment of the scraper machine can be completed without adjusting the transmission main shaft and chain gear. In this invention, two linear displacement rods are pushed towards the middle, compressing the compression spring I. Then, the hexagonal positioning grooves at one end of the two linear displacement rods are respectively connected to the corresponding hexagonal operating rods, thus completing the combination between the two rotating rods. When one of the rotating rods is rotated later, the other rotating rod can be rotated, and the tension of the two transmission chains is adjusted synchronously to ensure the tension balance of the two transmission chains. In this invention, the U-shaped fixing bracket is bolted to the scraper body, and combined with the lateral limiting effect of the guide rail, the lateral displacement of the scraper body is controlled within 0.5mm, forming a double anti-loosening structure to reduce the risk of loosening. The limiting structure, through the cooperation of the plug rod and the annular limiting groove, and the assistance of the rolling wheel, effectively ensures the stability of the scraper when conveying raw materials. The adjustment structure of the chain tensioning device controls the movement of the positioning fixing rod by rotating the rod, etc., and the tension of the transmission chain can be adjusted simply without adjusting the transmission shaft and chain gear. The one-way ratchet gear and the brake operating lever prevent reverse rotation and avoid loosening of the transmission chain. The design of the elastic sleeve ensures the tension balance of the two transmission chains, improves the stability and reliability of the equipment operation, and extends the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a scraper conveyor provided by the present invention; Figure 2 This is a cross-sectional structural schematic diagram of a scraper conveyor provided by the present invention; Figure 3 A three-dimensional structural diagram of the scraper body, transmission chain and chain gear of a scraper conveyor provided by the present invention; Figure 4 A three-dimensional exploded cross-sectional view of the U-shaped fixing bracket and scraper body of a scraper conveyor provided by the present invention. Figure 5 This is a three-dimensional exploded cross-sectional view of the traction rod and push rod of the scraper conveyor provided by the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the chain tightening device for the scraper conveyor provided by the present invention; Figure 7 This is a three-dimensional exploded structural diagram of the positioning and fixing rod and the connecting plate of the chain tightening device of the scraper conveyor provided by the present invention. Figure 8 A three-dimensional structural diagram of the box body I, box body II, and positioning and fixing rod of the chain tightening device of the scraper conveyor provided by the present invention; Figure 9 A three-dimensional cross-sectional view of the housing I of the chain tightening device for the scraper conveyor provided by the present invention; Figure 10 A three-dimensional cross-sectional view of the housing II of the chain tightening device for the scraper conveyor provided by the present invention; Figure 11 A three-dimensional structural schematic diagram of the one-way ratchet gear of the chain tightening device of the scraper conveyor provided by the present invention, and a three-dimensional cross-sectional structural schematic diagram of the brake operating lever; Figure 12 A three-dimensional exploded structural diagram of the box body II, linear displacement rod and elastic sleeve of the chain tightening device of the scraper conveyor provided by the present invention; Figure 13 This is a three-dimensional exploded view of the linear displacement rod, elastic sleeve, and hexagonal operating rod of the chain tightening device of the scraper conveyor provided by the present invention.

[0018] In the diagram: 1. Rectangular casing; 2. Material inlet; 3. Material outlet; 4. Transmission shaft; 5. Sprocket; 6. Transmission chain; 7. U-shaped fixed bracket; 8. Scraper body; 9. Guide rail; 10. Connecting rod; 11. Hollow cavity; 12. Sliding baffle; 13. Tension spring I; 14. Push rod; 15. Traction rod; 16. Trapezoidal guide groove; 17. Linear sliding rod; 18. Fixed rotating shaft; 19. Rolling wheel; 20. Annular limiting groove; 21. Connecting plate; 22. Positioning and fixing rod; 23. Box I; 24. Double... 25. Screw screw; 26. Movable base; 27. Bevel gear I; 28. Linear sliding groove; 29. ​​Folding protective bellows cover; 20. Box II; 31. Rotating rod; 32. Hollow inner cavity; 33. Hexagonal snap-fit ​​groove; 34. One-way ratchet; 35. Mounting plate; 36. Brake operating lever; 37. Long strip guide groove; 38. Tension spring II; 39. Hexagonal operating lever; 40. Linear displacement rod; 41. Hexagonal positioning groove; 42. Elastic sleeve; 43. Compression spring I; 44. Compression spring II; 45. Bevel gear II. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In one embodiment: Refer to Figure 1 and Figure 2 A scraper conveyor mainly includes a rectangular casing 1, which is made of high-strength steel and has good structural strength and wear resistance. A material inlet 2 is provided on one side of the top of the rectangular casing 1. The material inlet 2 is rectangular and its size is determined according to the actual flow rate and particle size of the conveyed material. A material outlet 3 is provided on the bottom side of the rectangular casing 1 away from the material inlet 2. The size of the material outlet 3 is adapted to the material inlet 2 to ensure smooth material conveying.

[0021] Reference Figure 2 and Figure 3 Inside the rectangular housing 1, two drive shafts 4 are rotatably connected. The drive shafts 4 are made of alloy steel and have undergone heat treatment, giving them high strength and toughness. Two chain gears 5 are fixedly sleeved on the outer walls of the two drive shafts 4. The teeth are standard involute teeth to ensure good meshing with the drive chain 6.

[0022] Reference Figure 2 and Figure 3It also includes two transmission chains 6, which are respectively driven by the outer walls of two adjacent sprockets 5, and the two sprockets 5 that cooperate with the transmission chains 6 are respectively set on the outer walls of two transmission main shafts 4; the transmission chains 6 are composed of multiple chain links, and the chain links are made of high-strength alloy steel.

[0023] Reference Figure 2 and Figure 3 It also includes multiple scraper bodies 8, and the multiple scraper bodies 8 are all set on one side of the two transmission chains 6 for conveying the raw materials in the rectangular housing 1; the scraper body 8 is provided with a fixing mechanism for fixing the scraper body 8 to the two transmission chains 6.

[0024] Reference Figure 4 The fixing mechanism includes two U-shaped fixing brackets 7 inserted into the outer wall of the scraper body 8. The U-shaped fixing brackets 7 are made of stainless steel and have good corrosion resistance. The two U-shaped fixing brackets 7 are respectively fixed to one side of the two transmission chains 6 by welding, and the welding strength meets the equipment operation requirements. Multiple bolts with M8-M12 specifications are threaded through the inside of each U-shaped fixing bracket 7, and the U-shaped fixing brackets 7 are fixedly connected to the scraper body 8 by bolts. The inner walls of the two opposite sides of the U-shaped fixing brackets 7 are each equipped with... Multiple guide rails 9 are provided, each with a rectangular cross-section. The scraper body 8 slides in conjunction with the guide rails 9 to ensure the stability of the scraper body 8 within the U-shaped fixed bracket 7. When installing the scraper body 8, it is slid into the U-shaped fixed bracket 7 along the guide rails 9 and then fixedly connected to the U-shaped fixed bracket 7 with bolts to ensure a strong connection. Preferably, detachable dustproof strips are added to both sides of the guide rails 9 of the U-shaped fixed bracket 7 to prevent material particles from entering the gap between the rails.

[0025] Reference Figures 2-5 It also includes a limiting structure to ensure the stability of the scraper body 8 within the rectangular housing 1 when the scraper body 8 is conveying raw materials.

[0026] The limiting structure includes a hollow cavity 11 disposed within the scraper body 8, the size of which is determined according to the size of the scraper body 8; two traction rods 15 slide through the scraper body 8, the traction rods 15 being made of high-strength steel; the ends of the two traction rods 15 that are close to each other slide into the hollow cavity 11, and the ends of the two traction rods 15 that are far apart are fixed with a connecting rod 10, one end of which extends to one side of the scraper body 8; a compression spring II 43 is sleeved on the outer wall of the traction rod 15, the compression spring II 43 being made of stainless steel spring wire with a wire diameter of 1-3mm, an outer diameter of 10-30mm, a free length of 50-150mm, and a spring stiffness of 5-20N / mm; the two ends of the compression spring II 43 are respectively connected by spring seats. One end of the insertion rod 10 is fixedly connected to the inner wall of one side of the scraper body 8, which is used to push the insertion rod 10 outward. The inner walls of the two sides of the rectangular housing 1 that are far apart from each other are provided with annular limiting grooves 20. The width of the annular limiting grooves 20 is 1-3mm larger than the diameter of the insertion rod 10, and the depth is 20-50mm. The insertion rod 10 extends into the annular limiting grooves 20 and slides in cooperation with the annular limiting grooves 20 (graphite inserts are added to the contact surface between the annular limiting grooves 20 and the insertion rod 10 to reduce wear caused by long-term friction and extend service life). The outer wall of the insertion rod 10 is rotatably fitted with a rotating ring. The rotating ring is made of copper alloy material, which has good wear resistance and self-lubricating properties. It is used to reduce the friction between the insertion rod 10 and the annular limiting grooves 20 when the insertion rod 10 moves in the annular limiting grooves 20.

[0027] When the scraper body 8 is conveying raw materials, the sliding cooperation between the plug rod 10 and the annular limiting groove 20 can limit the scraper body 8, preventing the bolts between the U-shaped fixing bracket 7 and the scraper body 8 from loosening and causing the scraper body 8 to detach from the U-shaped fixing bracket 7 due to long-term use; and when the scraper body 8 is conveying raw materials on the bottom inner wall of the rectangular housing 1 below the sprocket 5, the rolling wheel 19 abuts against the bottom inner wall of the rectangular housing 1, thereby limiting the linear sliding rod 17, so that the plug rod 10 extends into the annular limiting groove 20 under the action of the compression spring II 43, ensuring the limitation of the scraper body 8 by the plug rod 10 and the annular limiting groove 20.

[0028] Reference Figure 4 and Figure 5The limiting structure also includes a sliding baffle 12 that slides within the hollow cavity 11. The sliding baffle 12 is made of high-strength plastic. Multiple tension springs I 13 are fixed between the top of the sliding baffle 12 and the inner top wall of the hollow cavity 11 via spring seats. The tension springs I 13 are made of stainless steel spring wire with a wire diameter of 0.8-2mm, an outer diameter of 8-20mm, a free length of 30-100mm, and a spring stiffness of 3-15N / mm. Push rods 14 are fixed to both sides of the bottom of the tension springs I 13. The push rods 14 are made of high-strength steel with a diameter of 5-10mm. Trapezoidal guide grooves 16 are provided within both traction rods 15. The size of the trapezoidal guide grooves 16 is determined according to the size of the push rods 14, and the push rods 14 and the trapezoidal guide grooves 16 are... In the preferred embodiment, the contact surface between the push rod 14 and the trapezoidal guide groove 16 is coated with a hard alloy to ensure linear displacement accuracy during retraction, and is used to pull the traction rod 15 towards the center; a linear sliding rod 17 is fixed at the bottom of the sliding baffle 12, the linear sliding rod 17 is made of high-strength steel, and the bottom end of the linear sliding rod 17 slides to the bottom of the scraper body 8; a fixed rotating shaft 18 is fixedly inserted through the linear sliding rod 17, the fixed rotating shaft 18 is made of stainless steel, and the fixed rotating shaft 18 is located below the scraper body 8; both ends of the fixed rotating shaft 18 are rotatably connected to rolling wheels 19, the rolling wheels 19 are made of rubber, have good wear resistance and elasticity, and are used to reduce the friction between the bottom end of the linear sliding rod 17 and the inner wall of the rectangular housing 1.

[0029] When the scraper body 8 is located below the sprocket 5 and conveys the raw material to the bottom inner wall of the rectangular housing 1, the rolling wheel 19 abuts against the bottom inner wall of the rectangular housing 1, thereby limiting the linear sliding rod 17. Under the action of the compression spring II 43, the insertion rod 10 extends into the annular limiting groove 20, ensuring that the insertion rod 10 and the annular limiting groove 20 restrict the scraper body 8. Conversely, by pulling the linear sliding rod 17, the push rod 14 extends into the trapezoidal guide groove 16, which can move the insertion rod 10 out of the annular limiting groove 20, thereby releasing the restriction on the scraper body 8 and facilitating the disassembly of the scraper body 8 later.

[0030] A method of using a scraper conveyor: one of the transmission shafts 4 is driven to rotate by a motor drive reducer. The transmission shaft 4 drives the scraper body 8 to run through the cooperation of the sprocket 5 and the transmission chain 6 to complete the conveying operation. During conveying, raw materials are put into the rectangular casing 1 through the material input port 2. The transmission chain 6 drives the scraper body 8 to rotate counterclockwise and discharge the raw materials from the material output port 3. In addition, when the scraper body 8 is conveying raw materials, the sliding cooperation between the plug rod 10 and the annular limiting groove 20 can limit the scraper body 8, preventing the bolts between the U-shaped fixed bracket 7 and the scraper body 8 from loosening due to long-term use, thus preventing the scraper body 8 from separating from the U-shaped fixed bracket 7. When the scraper body 8 is located below the sprocket 5 and conveys the raw materials on the bottom inner wall of the rectangular housing 1, the rolling wheel 19 abuts against the bottom inner wall of the rectangular housing 1, thereby limiting the linear sliding rod 17, so that the plug rod 10 extends into the annular limiting groove 20 under the compression spring II 43, ensuring the limitation of the scraper body 8 by the plug rod 10 and the annular limiting groove 20. When the scraper body 8 wears out after prolonged use and needs to be replaced, move the scraper body 8 to be replaced below the material inlet 2, and then disconnect the threaded connection between the U-shaped fixing bracket 7 and the scraper body 8. At this time, the linear sliding rod 17 is located above the scraper body 8. Pull the linear sliding rod 17 upward, and the linear sliding rod 17 will drive the sliding baffle 12 to move. The tension spring I 13 is in a stretched state, and the push rod 14 extends into the trapezoidal guide groove 16 under the action of the sliding baffle 12. Pull the plug rod 10 and the traction rod 15 towards the middle, and the plug rod 10 will disengage from the annular limiting groove 20, releasing the limitation on the scraper body 8. At this time, the scraper body 8 can be removed, completing the replacement operation of the scraper body 8.

[0031] Reference Figures 6-8 The chain tensioning device of the scraper conveyor is used to adjust the tension of the transmission chain 6 in the scraper conveyor described above. It includes two housings I23, which are located on both sides of the transmission chain 6. The housings I23 are made of high-strength aluminum alloy and have good structural strength and corrosion resistance.

[0032] Reference Figure 6 and Figure 7 Both ends of the transmission chain 6 are fixed with connecting plates 21, which are made of high-strength steel. The same positioning and fixing rod 22 slides through the two connecting plates 21 on the same side, which is made of high-strength alloy steel.

[0033] Reference Figures 6-8 In order to control the two positioning and fixing rods 22 to move closer to each other and to control the tension of the transmission chain 6, an adjustment structure is provided in the two boxes I 23.

[0034] Reference Figure 8 and Figure 9The adjustment structure includes two bidirectional spiral screws 24, which are made of high-strength alloy steel and hardened to have high hardness and wear resistance. Their thread helix angle is less than the equivalent friction angle to achieve self-locking. The two bidirectional spiral screws 24 rotate within two housings I 23. Each housing I 23 has two linear sliding grooves 27 on its adjacent side. The width of the linear sliding grooves 27 is 1-3 mm larger than the diameter of the positioning and fixing rods 22. The two ends of the positioning and fixing rods 22 extend into the corresponding linear sliding grooves 27 and slide in connection with them. Two movable bases 25 are slidably connected within each housing I 23. The movable bases 25 are made of high-strength plastic and have good wear resistance and self-lubricating properties. The movable bases 25 are fixed to one end of the corresponding positioning and fixing rods 22. The two movable bases 25 are threaded onto the positive and negative thread sections of the corresponding bidirectional spiral screws 24. The movement of the two positioning and fixing rods 22 towards each other is controlled by the cooperation between the bidirectional spiral screws 24 and the two movable bases 25.

[0035] Reference Figures 8-10 Two boxes I 23 are fixed to one end of the same box II 29, which is made of high-strength aluminum alloy. One end of each of the two bidirectional spiral screws 24 extends into the box II 29 and is fixed with a bevel gear I 26, which has a standard involute tooth profile. A rotating rod 30 is rotatably connected inside the box II 29. The rotating rod 30 is made of high-strength alloy steel. Two bevel gears II 44 are fixedly sleeved on the outer wall of the rotating rod 30. The number of teeth of the bevel gears II 44 is adapted to the number of teeth of the bevel gears I 26, and the bevel gears II 44 mesh with the corresponding bevel gears I 26. One end of the rotating rod 30 extends to one side of the box II 29 and is provided with a hexagonal snap-fit ​​groove 32. The size of the hexagonal snap-fit ​​groove 32 is determined according to the specifications of the hexagonal wrench.

[0036] Connecting plates 21 are bolted to both ends of the transmission chain 6. When the tension of the transmission chain 6 needs to be tightened, the hexagonal wrench is connected to the hexagonal locking groove 32, and the rotating rod 30 is driven to rotate. The rotating rod 30 drives the two bidirectional spiral screws 24 to rotate through the cooperation of bevel gear I 26 and bevel gear II 44. The bidirectional spiral screws 24 drive the two movable bases 25 to move towards each other. The movable bases 25 drive the positioning and fixing rod 22 to move, and then control the two ends of the transmission chain 6 to move closer together through the connecting plates 21, thereby completing the tension control. The operation is simple and the tension adjustment of the scraper machine can be completed without adjusting the transmission main shaft 4 and the chain gear 5.

[0037] Reference Figure 10 and Figure 11The adjustment structure also includes a hollow inner cavity 31 set inside the housing II 29, with one end of the rotating rod 30 rotatably passing through the hollow inner cavity 31; a one-way ratchet 33 is rotatably connected inside the hollow inner cavity 31, the one-way ratchet 33 is made of high-strength alloy steel, and the one-way ratchet 33 is fixedly sleeved on the outer wall of the rotating rod 30; a mounting plate 34 is fixed inside the hollow inner cavity 31, the mounting plate 34 is made of high-strength steel; a brake operating rod 35 is provided on the outer wall of the mounting plate 34, the brake operating rod 35 is made of high-strength plastic; a long strip guide groove 36 is provided inside the brake operating rod 35, the width of the long strip guide groove 36 is 1-3mm larger than the thickness of the mounting plate 34, and the mounting plate 34 passes through the elongated guide groove 36 and is slidably connected to the elongated guide groove 36; multiple tension springs II 37 are fixed to the side of the mounting plate 34 away from the one-way ratchet 33 by springs. The tension springs II 37 are made of stainless steel spring wire with a wire diameter of 0.5-1.5mm, an outer diameter of 5-15mm, a free length of 20-80mm, and a spring stiffness of 1-10N / mm; the ends of the multiple tension springs II 37 away from the one-way ratchet 33 are fixedly connected to the inner wall of the corresponding elongated guide groove 36 through spring seats, which is used to drive the brake operating lever 35 to move in the direction of the one-way ratchet 33, brake the one-way ratchet 33, and prevent the one-way ratchet 33 from rotating in the opposite direction.

[0038] The rotating rod 30 drives the one-way ratchet 33 to rotate. The inclined surface of the teeth of the one-way ratchet 33 cooperates with the brake operating rod 35 to move the brake operating rod 35 away from the one-way ratchet 33. Under the tension of the tension spring II 37, the brake operating rod 35 moves towards the one-way ratchet 33. Thus, the cooperation between the one-way ratchet 33 and the brake operating rod 35 can restrict the one-way ratchet 33 and prevent it from rotating in the opposite direction. This ensures the tension control of the transmission chain 6 and prevents the rotating rod 30 from rotating in the opposite direction, which would cause the transmission chain 6 to loosen.

[0039] Reference Figure 9 Foldable protective bellows covers 28 are fixed to the inner walls of the two sides of the linear sliding groove 27 that are far apart from each other. The foldable protective bellows covers 28 are made of rubber and have good flexibility and sealing performance. The two foldable protective bellows covers 28 are fixedly connected to the two sides of the positioning and fixing rod 22 respectively. The positioning and fixing rod 22 and the two foldable protective bellows covers 28 are used to seal the linear sliding groove 27 to prevent external dust from entering the box I 23 and affecting the operation of the bidirectional spiral screw 24.

[0040] In another embodiment: Refer to Figure 12 and Figure 13It also includes an elastic sleeve 41, which is made of rubber and has good elasticity and flexibility. Two linear displacement rods 39 are slidably connected inside the elastic sleeve 41. The linear displacement rods 39 are made of high-strength steel. The ends of the two linear displacement rods 39 that are close to each other are fixed with the same compression spring I 42 through spring seats. The compression spring I 42 is made of stainless steel spring wire with a wire diameter of 1-3mm, an outer diameter of 10-30mm, a free length of 50-150mm, and a spring stiffness of 5-20N / mm.

[0041] Reference Figure 12 and Figure 13 Each of the two linear displacement rods 39 has a hexagonal positioning groove 40 at one end that is far apart from each other. The size of the hexagonal positioning groove 40 is determined according to the specifications of the hexagonal operating rod 38. A hexagonal operating rod 38 is inserted into each of the two hexagonal positioning grooves 40. The ends of the two hexagonal operating rods 38 that are far apart from each other are fixedly connected to one end of the corresponding rotating rod 30. The tension of the two transmission chains 6 can be controlled by the cooperation of the linear displacement rods 39, the elastic sleeve 41 and the hexagonal positioning grooves 40.

[0042] Pushing the two linear displacement rods 39 towards the center compresses the compression spring I 42. Then, the hexagonal positioning grooves 40 at one end of the two linear displacement rods 39 are respectively connected to the corresponding hexagonal operating rods 38. At this time, the combination between the two rotating rods 30 is completed. When one of the rotating rods 30 is rotated later, the other rotating rod 30 can be rotated, and the tension of the two transmission chains 6 is adjusted synchronously to ensure the tension balance of the two transmission chains 6.

[0043] The operation method of the chain tensioning device of the scraper conveyor is as follows: Connecting plates 21 are bolted to both ends of the transmission chain 6. When the tension of the transmission chain 6 needs to be tightened, the hexagonal wrench is engaged with the hexagonal locking groove 32, driving the rotating rod 30 to rotate. The rotating rod 30 drives two double-sided spiral screws 24 to rotate through the engagement of bevel gear I 26 and bevel gear II 44. The double-sided spiral screws 24 drive two movable bases 25 to move towards each other. The movable bases 25 drive the positioning and fixing rod 22 to move, thereby controlling the beginning and end ends of the transmission chain 6 to move closer together through the connecting plates 21, thus completing the tension control. The operation is simple, and the tension adjustment of the scraper conveyor can be completed without adjusting the transmission main shaft 4 and the chain gear 5. When the rotating rod 30 rotates, it synchronously drives the one-way ratchet 33. The inclined surface of the teeth of the one-way ratchet 33 engages with the brake operating rod 35, moving the brake operating rod 35 away from the one-way ratchet 33. The brake operating rod 35 is under tension... Under the tension of spring II 37, the ratchet moves towards the one-way ratchet 33. The engagement of the one-way ratchet 33 with the brake lever 35 restricts its rotation, preventing it from turning in the opposite direction. This ensures tension control of the transmission chain 6 and prevents the rotating rod 30 from turning in the opposite direction, thus preventing the transmission chain 6 from becoming loose. When adjusting the tension of the transmission chain 6 in the scraper conveyor, to ensure the scraper body 8 can continue to be used, the tension of the two transmission chains 6 needs to be adjusted. At this time, the two linear displacement rods 39 are pushed towards the center, compressing the spring I 42. Then, the hexagonal positioning grooves 40 at one end of the two linear displacement rods 39 are respectively engaged with the corresponding hexagonal operating rods 38. This completes the combination between the two rotating rods 30. Later, when one rotating rod 30 is rotated, the other rotating rod 30 will also be rotated, simultaneously adjusting the tension of the two transmission chains 6 to ensure tension balance.

[0044] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A scraper conveyor, characterized in that, include: A rectangular casing (1) has a material inlet (2) on one side of its top and a material outlet (3) on the side of its bottom away from the material inlet (2). Two drive shafts (4) are rotatably connected inside a rectangular housing (1), and two sprockets (5) are fixedly sleeved on the outer wall of each drive shaft (4). Two transmission chains (6) mesh with two adjacent sprockets (5), and the two sprockets (5) meshing with the same transmission chain (6) are located on two transmission shafts (4). Multiple scraper bodies (8) are located on one side of two transmission chains (6), and the scraper bodies (8) are fixedly connected to the two transmission chains (6) respectively through two U-shaped fixed brackets (7); The limiting structure includes annular limiting grooves (20) on the inner walls of both sides of the rectangular housing (1) and two plug-in rods (10) in the scraper body (8). The plug-in rods (10) elastically abut against the inner wall of the scraper body (8) through compression spring II (43), and the ends of the plug-in rods (10) extend into the annular limiting grooves (20) and slide in cooperation with them. When the scraper body (8) is conveying material under the sprocket (5), the plug-in rods (10) maintain cooperation with the annular limiting grooves (20) under the action of compression spring II (43) to prevent the scraper body (8) from detaching from the U-shaped fixed bracket (7).

2. The scraper conveyor according to claim 1, characterized in that, The U-shaped fixing bracket (7) is fixedly connected to the scraper body (8) by bolts. The inner walls on both sides of the U-shaped fixing bracket (7) are provided with guide rails (9). The side of the scraper body (8) slides with the guide rails (9) to limit the lateral displacement of the scraper body (8).

3. A scraper conveyor according to claim 2, characterized in that, The limiting structure also includes a sliding baffle (12) that is slidably disposed in the hollow cavity (11) of the scraper body (8). The top of the sliding baffle (12) is connected to the top of the hollow cavity (11) by a tension spring I (13). A linear sliding rod (17) extending to the bottom of the scraper body (8) is fixed at the bottom of the sliding baffle (12). A rolling wheel (19) is rotatably connected to the bottom end of the linear sliding rod (17). When the scraper body (8) moves to the bottom of the sprocket (5), the rolling wheel (19) abuts against the inner wall of the bottom of the rectangular housing (1), forcing the plug rod (10) to remain extended.

4. A scraper conveyor according to claim 3, characterized in that, One end of the plug rod (10) is provided with a trapezoidal guide groove (16) via a traction rod (15), and a push rod (14) that cooperates with the trapezoidal guide groove (16) is fixed at the bottom of the sliding baffle (12); when the scraper body (8) is above the sprocket (5), the linear sliding rod (17) is pulled upward, and the push rod (14) squeezes the trapezoidal guide groove (16) to retract the plug rod (10) and release the cooperation with the annular limiting groove (20).

5. A chain tensioning device for a scraper conveyor, used for adjusting the tension of the transmission chain (6) in a scraper conveyor as described in claim 4, characterized in that, include: Two boxes I (23) are located on both sides of the transmission chain (6); Two positioning and fixing rods (22) slide through the connecting plates (21) at both ends of the transmission chain (6); The adjustment structure includes a bidirectional spiral screw (24) rotatably connected to two housings I (23), and two movable bases (25) threadedly connected to the positive and negative thread sections of the bidirectional spiral screw (24); the movable bases (25) are fixedly connected to the end of the positioning and fixing rod (22); when the bidirectional spiral screw (24) is rotated, the two movable bases (25) drive the positioning and fixing rod (22) to move towards each other, tightening the transmission chain (6).

6. The chain tensioning device of the scraper conveyor according to claim 5, characterized in that, Two bidirectional spiral screws (24) extend into the housing II (29) and fix bevel gear I (26). A rotating rod (30) is provided inside the housing II (29). Two bevel gears II (44) that mesh with bevel gear I (26) are fixed on the rotating rod (30). A hexagonal snap-fit ​​groove (32) is provided at one end of the rotating rod (30). A one-way ratchet gear (33) is fixedly sleeved on the outer wall of the rotating rod (30). A brake operating rod (35) is provided inside the housing II (29) that elastically abuts against the one-way ratchet gear (33) through a tension spring II (37) to prevent the bidirectional spiral screws (24) from reversing.

7. The chain tensioning device of the scraper conveyor according to claim 6, characterized in that, A linear sliding groove (27) is provided on the side wall of the box body I (23), and the end of the positioning and fixing rod (22) slides through the linear sliding groove (27).

8. The chain tensioning device of the scraper conveyor according to claim 7, characterized in that, It also includes an elastic sleeve (41), which has two linear displacement rods (39) slidably connected inside. The inner ends of the two linear displacement rods (39) are connected by a compression spring I (42), and the outer ends are provided with hexagonal positioning grooves (40).

9. The chain tensioning device of the scraper conveyor according to claim 8, characterized in that, The ends of the two rotating rods (30) are respectively fixed with hexagonal operating rods (38) that are inserted into the hexagonal positioning grooves (40). Pushing the two linear displacement rods (39) to compress the spring I (42) can make the hexagonal positioning grooves (40) simultaneously engage the two hexagonal operating rods (38).

10. A method for using the chain tensioning device of a scraper conveyor, applied to the chain tensioning device of the scraper conveyor as described in claim 9, characterized in that, Includes the following steps: S1. Connect the hexagonal wrench to the hexagonal snap-fit ​​groove (32) on the rotating rod (30) to prepare to drive the rotating rod (30) to rotate; S2. Turn the hex wrench to drive the rotating rod (30) to rotate. The rotating rod (30) drives the two double-direction screws (24) to rotate through the cooperation of bevel gear I (26) and bevel gear II (44). At the same time, the rotating rod (30) drives the one-way ratchet (33). S3, the rotation of the bidirectional helical screw (24) drives the two movable bases (25) to move towards each other; S4. The movable base (25) drives the positioning and fixing rod (22) to move. The positioning and fixing rod (22) controls the two ends of the transmission chain (6) to approach each other through the connecting plate (21), thereby completing the tension tightening of the transmission chain (6). S5. When it is necessary to adjust the tension of the two transmission chains (6) synchronously, push the two linear displacement rods (39) towards the middle to compress the spring I (42), so that the hexagonal positioning groove (40) at one end of the linear displacement rod (39) is connected to the corresponding hexagonal operating rod (38) to connect the two rotating rods (30). S6. Drive one of the rotating rods (30) to rotate, and drive the other rotating rod (30) to rotate synchronously through the docked linear displacement rod (39) and hexagonal operating rod (38), thereby synchronously adjusting the tension of the two transmission chains (6) and maintaining tension balance.

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