Self-cleaning structure of a flight chain and method for preventing material accumulation

Abstract

The application discloses a self-cleaning structure of a scraper chain and a method for preventing material accumulation, comprising a rack and a support frame installed at the bottom of the rack, and a conveying mechanism is installed between the rack, and relates to the technical field of cleaning. The self-cleaning structure of the scraper chain and the method for preventing material accumulation, the application actively intervenes in the cleaning timing through an external controller, breaks the natural cycle of the generation, thickening and falling of the powder adhesion layer, avoids the problem that large lumps and irregular falling are mixed into the fresh powder flow from the root, solves the quality fluctuation of downstream products caused by uneven material particle size, dry ice cleaning generates no liquid water in the whole process, the peeled material always maintains a dry solid form and is synchronously merged into the main material flow, the secondary risk of slurry paste generated by the traditional water washing method is eliminated, the material accumulation dead angle at the bottom of the conveying groove is fundamentally eliminated, and the effective conveying volume and stable conveying efficiency of long-term operation of the equipment are ensured.

Description

Technical Field

[0001] This invention relates to the field of cleaning technology, specifically to a self-cleaning structure for a scraper chain and a method for preventing material accumulation. Background Technology

[0002] The scraper chain self-cleaning structure refers to a mechanical device integrated into the scraper chain body or working in conjunction with the chain. It utilizes the kinetic energy of the chain's own cyclic movement to automatically remove residual materials adhering to the chain and scraper while conveying materials. It is an integrated design that eliminates the need for additional machine shutdowns for manual cleaning. Essentially, it is a structure that combines "conveyance function" and "cleaning function" into one. By changing the geometry of the traditional scraper chain, adding dedicated cleaning elements, or optimizing the motion trajectory, it achieves continuous self-cleaning during equipment operation, thus solving the problem of material accumulation in bulk material conveying systems.

[0003] During the scraper conveying of powdery materials, due to the characteristics of powdery materials being small in particle size, easily absorbing moisture and moisture, and easily generating electrostatic adsorption, some raw materials will continuously adhere to the working surface and edges of the scraper during the conveying process. As the running time increases, the adhesion layer on the scraper surface will gradually thicken. When the material adhesion layer on the scraper surface reaches a certain thickness, it will fall off irregularly due to its own weight or equipment vibration. The detached lumps will mix with the fresh powdery raw materials conveyed later, causing uneven particle size and seriously affecting the quality stability of downstream products. At the same time, the detached lumps will accumulate at the bottom of the conveying trough, forming a dead corner of material accumulation that is difficult to remove. The long-term accumulation of material will gradually harden and further block the conveying channel, reducing the effective conveying volume and conveying efficiency of the equipment. Therefore, there is an urgent need to develop a scraper chain self-cleaning structure and a method for preventing material accumulation that can efficiently remove powder adhering to the scraper surface and effectively prevent material accumulation in the system. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a self-cleaning structure for scraper chains and a method for preventing material accumulation, thus solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a self-cleaning structure for a scraper chain and a method for preventing material accumulation thereon, comprising a frame and a support frame installed at the bottom of the frame, a conveying mechanism installed between the frames, a conveying frame installed at the bottom of the frame, a feed end installed at the right end of the conveying frame, a discharge end installed at the left end of the conveying frame, and a plurality of disassembly and assembly components evenly installed on the outer wall of the conveying mechanism, each of which has a scraper body fixedly installed on its outer wall; A cleaning brush is installed on the left side of the conveying mechanism via an adjustment mechanism. It is used to clean residual powder that has lost its adhesion and is temporarily stuck on the surface of the scraper body by gravity or static electricity. A conveying pipe is installed on the top of the adjustment mechanism via a mounting base. Several fan-shaped flat-head nozzles are evenly installed on the outer wall of the conveying pipe. The nozzles spray at high speed onto the powdery material layer attached to the scraper surface to perform thermal shock and micro-explosion to peel off the powdery material attached to the scraper body surface.

[0006] Furthermore, the adjustment mechanism includes an adjustment push rod hinged to the top of the discharge end. The movable end of each adjustment push rod is hinged to the same adjustment seat. Adjustment arms are symmetrically hinged to the side walls of the conveying mechanism. A fixed seat is fixedly installed at the left end of each adjustment arm. The top wall of the fixed seat is fixedly connected to the bottom wall of the mounting seat. The side wall of the fixed seat is fixedly connected to the adjustment seat. A drive shaft is rotatably installed between the fixed seats. The outer wall of the drive shaft and located between the fixed seats are fixedly connected to a cleaning brush. The rear end of the drive shaft passes through the corresponding fixed seat and is fixedly installed with a synchronous pulley one. The rear end of the conveying mechanism is fixedly installed with a synchronous pulley two. The outer walls of both synchronous pulley one and synchronous pulley two are driven by the same synchronous belt.

[0007] Furthermore, the conveying mechanism includes rotating shafts rotatably mounted on both sides of the frame. The rear end of the rotating shaft on the left side is fixedly connected to a second synchronous pulley. Transmission sprockets are fixedly mounted on the front and rear parts of the outer wall of the rotating shaft. Transmission chains are drivenly mounted on the outer walls of the transmission sprockets on the same side. The outer walls of the transmission chains are fixedly connected to the disassembly and assembly components. Protective covers are fixedly mounted on the outer wall of the frame at positions corresponding to the transmission sprockets. The outer wall of the protective cover on the left side is hinged to the adjusting arm. A drive motor is mounted on the outer wall of one of the protective covers. The power shaft of the drive motor is fixedly connected to the corresponding rotating shaft through a coupling.

[0008] Furthermore, the disassembly and assembly assembly includes several bases fixedly installed between the transmission chains. Each base has a concave structure in the middle. A platform is installed on the top of the base via a locking mechanism. A replacement mechanism is installed on the top of the platform. The top of the replacement mechanism is fixedly connected to the scraper body. The bottom wall of the platform has a convex structure that fits snugly against the concave structure in the middle of the base. A positioning seat is fixedly installed on the convex part of the bottom wall of the platform. A positioning hole is opened in the concave part of the top of the base. The inner wall of the positioning hole fits against the outer wall of the corresponding positioning seat to form an installation positioning.

[0009] Furthermore, the locking mechanism includes mounting grooves formed at the front and rear of the base bottom wall. A rotating cylinder is installed on the inner wall of the mounting groove. A cross fastener is fixedly installed at the bottom end of the rotating cylinder. A torsion handle is fixedly installed on the top of the outer wall of the rotating cylinder. A locking groove is formed on the top wall of the base corresponding to the mounting groove. A cross through groove is formed on the top wall of the base corresponding to the locking groove. The cross fastener can enter the locking groove through the cross through groove and rotate the rotating cylinder by the torsion handle to form a misaligned arrangement with the cross through groove to prevent it from falling out of the mounting groove.

[0010] Furthermore, a sliding ring is slidably installed on the outer wall of the rotating cylinder, and several positioning pins are uniformly fixedly installed on the bottom wall of the sliding ring in a circular pattern. Locking holes are opened on the top wall of the cross-shaped fastener, and the inner wall of the locking hole is respectively in contact with the outer wall of the corresponding positioning pin. Several limiting holes are uniformly opened on the top wall of the base at the position of the corresponding locking groove. The positioning pin passes through the limiting hole and enters the locking hole of the corresponding cross-shaped fastener top wall to prevent the cross-shaped fastener from rotating and disengaging from the locking groove.

[0011] Furthermore, an abutment spring is installed between the top wall of the sliding ring and the mounting groove and sleeved on the outer wall of the rotating cylinder. One end of the abutment spring is fixedly connected to the top wall of the sliding ring, and the other end of the abutment spring is fixedly connected to the inner top wall of the mounting groove. An extension shaft is slidably installed on the inner wall of the rotating cylinder. A guide groove is opened on the outer wall of the rotating cylinder. A guide slider is slidably installed on the inner wall of the guide groove. The outer wall of the guide slider is fixedly connected to the outer wall of the extension shaft. A tension grip is fixedly installed at the top end of the extension shaft.

[0012] Furthermore, the changing mechanism includes a stabilizing seat fixedly installed on the top of the base. A limiting cavity is opened on the top of the stabilizing seat. Several adjusting springs are evenly installed on the inner wall of the limiting cavity. The top of each adjusting spring is fixedly installed with the same slide block. The outer wall of the slide block is slidably connected to the inner wall of the limiting cavity. A connecting seat is fixedly installed on the top of the slide block. The top of the connecting seat is fixedly connected to the scraper body.

[0013] Furthermore, guide grooves are provided on both the front and rear walls of the stabilizer, and guide seats are slidably installed on the inner walls of the guide grooves. The guide seats are fixedly connected to the slides. Locking shafts are fixedly installed on both sides of the front and rear walls of the stabilizer at the guide grooves. Four-jaw clips are fixedly installed on the outer walls of the guide seats. The four-jaw clips are symmetrically arranged and respectively snapped onto the outer walls of the corresponding locking shafts.

[0014] A self-cleaning and anti-material-accumulation method for scraper chains includes the following steps: S1. Insert the scraper body into the positioning hole through the positioning seat for initial positioning. Operate the pull handle to make the cross fastener pass through the cross through groove and enter the locking groove and rotate to lock it. After releasing, the abutment spring pushes the positioning pin into the locking hole to complete the double locking installation. S2. Press the four-claw clip to disengage from the locking shaft, push and pull the scraper body to adjust the extension length, and then reset and lock it in place; start the adjusting push rod to drive the cleaning brush and the fan-shaped flat nozzle to adjust to the working tilt angle. S3. Start the drive motor to drive the transmission chain and scraper body to run in a cycle, scraping and pushing the powder from the feed end to the discharge end; S4. Dry ice particles are sprayed at high speed onto the surface of the scraper body through a fan-shaped flat nozzle. Thermal shock and micro-explosion effect are used to peel off the bonded powder. No liquid water is used throughout the process. S5. The second synchronous pulley drives the cleaning brush and the transmission chain to rotate synchronously via the synchronous belt, sweeping away residual powder and merging it into the main material flow to prevent material accumulation.

[0015] The present invention has the following beneficial effects: (1) The self-cleaning structure of the scraper chain and its anti-accumulation method: The present invention actively intervenes in the cleaning sequence through an external controller, interrupting the natural cycle of powder adhesion layer generation, thickening and shedding, thereby avoiding the problem of large clumps falling irregularly and mixing into the fresh powder flow from the root, solving the problem of downstream product quality fluctuation caused by uneven material particle size, and dry ice cleaning without the generation of liquid water. The peeled material always maintains a dry solid form and is simultaneously incorporated into the main material flow, eliminating the secondary risk of mud paste generated by traditional water washing methods, fundamentally eliminating the dead corner of material accumulation at the bottom of the conveying trough, and ensuring the effective conveying volume and stable conveying efficiency of the equipment for long-term operation.

[0016] (2) The self-cleaning structure of the scraper chain and its anti-accumulation method: The present invention can reduce the thickness of the powder adhesion layer on the scraper surface and clean it by means of dry ice micro-explosion and rotating brush. The cleaning efficiency is further improved, and the problem of abnormal increase in scraper weight caused by thickening of the adhesion layer is completely eliminated. The transmission chain conveying tension can be reduced, and the meshing wear of chain pins, sleeves and sprocket teeth can be significantly reduced.

[0017] (3) The self-cleaning structure of the scraper chain and its anti-accumulation method adopt a purely physical cleaning principle. The dry ice particles have non-abrasive and non-conductive properties. During the cleaning process, the anti-stick coating on the scraper surface will not be damaged, thus avoiding the vicious cycle of subsequent powder adhesion caused by scratches on the scraper surface. The dry ice sublimation process can effectively eliminate the static electricity accumulation on the scraper surface, so that the clean scraper does not have the static electricity conditions to quickly adsorb powder for a considerable period of time, further extending the cleaning interval. Combined with the low-damage fine sweeping of the soft nylon bristle cleaning brush, it ensures the thorough removal of residual powder without causing a lot of wear on the equipment body.

[0018] (4) The self-cleaning structure of the scraper chain and its anti-accumulation method: The cross fastener + positioning pin double locking quick-installation structure designed in this invention can realize the quick replacement of scrapers without disassembling any chain components. The replacement time of a single scraper is further shortened, which greatly reduces maintenance downtime. With the scraper extension length adjustment and the electric angle adjustment function of the cleaning system, the operating parameters can be flexibly adjusted according to the particle size, humidity and adhesion characteristics of different powders, so that the material application range of the device covers the powder material conveying needs of multiple fields.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a front view of the external structure of the present invention; Figure 2 This is a rear view of the external structure of the present invention; Figure 3 This is a schematic diagram of the combination of the support frame, frame, and conveyor frame of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the combination of the support frame, frame, and conveyor frame of the present invention. Figure 2 ; Figure 5 This is a simplified schematic diagram of the conveying mechanism of the present invention; Figure 6 This is a schematic diagram of the overall conveying mechanism of the present invention; Figure 7 This is an assembly diagram of the support frame, machine frame, conveyor frame, and conveyor mechanism of the present invention; Figure 8 This is a schematic diagram of the conveying mechanism and scraper body assembly of the present invention; Figure 9 This is a schematic diagram of the assembly of the disassembly and assembly components and the scraper body of the present invention; Figure 10 This is an exploded view of the internal structure of the changing mechanism of the present invention; Figure 11 This is a cross-sectional view of the internal structure of the stabilizer of the present invention; Figure 12 This is an exploded view of the internal structure of the base and platform of the present invention; Figure 13 This is a cross-sectional view of the internal structure of the base of the present invention; Figure 14 This is an exploded view of the internal structure of the base and locking mechanism of the present invention; Figure 15 This is an exploded view of the internal structure of the locking mechanism of the present invention; Figure 16 This is an exploded view of the internal structure and a schematic diagram of the external structure of the locking mechanism of the present invention; Figure 17This is a top view of the external structure of the base of the present invention; Figure 18 This is a schematic diagram of the combination of the protective cover, adjustment mechanism, cleaning brush, mounting base and delivery pipe of the present invention. Figure 1 ; Figure 19 This is a schematic diagram of the assembly of the adjustment mechanism, cleaning brush, mounting base, fan-shaped flat nozzle, and delivery pipe of the present invention. Figure 2 ; Figure 20 This is a schematic diagram of the assembly of the adjustment mechanism, cleaning brush, mounting base, fan-shaped flat nozzle, and delivery pipe of the present invention. Figure 3 ; Figure 21 This is a schematic diagram of the external structure of the adjustment mechanism of the present invention.

[0021] In the diagram, 1. Support frame; 2. Machine frame; 3. Conveyor frame; 31. Discharge end; 32. Feed end; 4. Conveying mechanism; 41. Drive motor; 42. Protective cover; 43. Rotating shaft; 44. Transmission sprocket; 45. Transmission chain; 5. Scraper body; 6. Assembly / disassembly assembly; 61. Changing mechanism; 611. Stabilizing seat; 612. Limiting cavity; 613. Connecting seat; 614. Slide seat; 615. Guide seat; 616. Adjusting spring; 617. Guide groove; 618. Locking shaft; 619. Four-jaw clamp; 62. Locking mechanism; 621. Mounting groove; 622. Torque handle; 623. Guide groove; 624. Rotation. 625. Cylinder; 626. Cross fastener; 627. Locking hole; 628. Extension handle; 629. Guide slider; 6210. Abutment spring; 6211. Sliding ring; 6212. Positioning pin; 6213. Locking groove; 6214. Cross through groove; 6215. Limiting hole; 63. Base; 64. Positioning hole; 65. Positioning seat; 66. Base platform; 7. Adjustment mechanism; 71. Adjustment arm; 72. Fixed seat; 73. Adjustment seat; 74. Adjustment push rod; 75. Synchronous pulley two; 76. Drive shaft; 77. Synchronous pulley one; 8. Cleaning brush; 9. Mounting seat; 10. Delivery pipe; 11. Fan-shaped flat nozzle. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] Please see Figures 1-21 The present invention provides a technical solution: a self-cleaning structure of a scraper chain and a method for preventing material accumulation, including a frame 2 and a support frame 1 installed at the bottom of the frame 2, a conveying mechanism 4 installed between the frames 2, a conveying frame 3 installed at the bottom of the frame 2, a feed end 32 installed at the right end of the conveying frame 3, a discharge end 31 installed at the left end of the conveying frame 3, and a plurality of disassembly and assembly components 6 evenly installed on the outer wall of the conveying mechanism 4, and a scraper body 5 is fixedly installed on the outer wall of each disassembly and assembly component 6; A cleaning brush 8 is installed on the left side of the conveying mechanism 4 via the adjustment mechanism 7. It is used to clean residual powder that has lost its adhesion and is temporarily stuck on the surface of the scraper body 5 by gravity or static electricity. A conveying pipe 10 is installed on the top of the adjustment mechanism 7 via the mounting base 9. Several fan-shaped flat-head nozzles 11 are evenly installed on the outer wall of the conveying pipe 10. They are sprayed at high speed onto the powdery material layer attached to the scraper surface to perform thermal shock and micro-explosion to peel off the powdery material attached to the surface of the scraper body 5. In this implementation plan, an integrated design of conveying and cleaning is adopted. The dry ice spray cleaning unit and the mechanical sweeping unit are arranged synchronously on the return side of the conveying mechanism 4. The scraper body 5 can be continuously self-cleaned online without interrupting the material conveying operation. This completely eliminates the traditional manual stopping and scraping and water washing cleaning methods, and fundamentally solves the problems of material accumulation and product quality caused by the adhesion, clumping and falling off of the scraper surface during the conveying of powdery materials.

[0025] Specifically, the adjustment mechanism 7 includes an adjustment push rod 74 hinged to the top of the discharge end 31. The movable end of the adjustment push rod 74 is hinged to the same adjustment seat 73. The side walls of the conveying mechanism 4 are symmetrically hinged to adjustment arms 71. The left end of the adjustment arm 71 is fixedly mounted with a fixed seat 72. The top wall of the fixed seat 72 is fixedly connected to the bottom wall of the mounting seat 9. The side wall of the fixed seat 72 is fixedly connected to the adjustment seat 73. A drive shaft 76 is rotatably mounted between the fixed seats 72. The outer wall of the drive shaft 76 and located between the fixed seats 72 are fixedly connected to the cleaning brush 8. The rear end of the drive shaft 76 passes through the corresponding fixed seat 72 through a bearing and is fixedly mounted with a first synchronous pulley 77. The rear end of the conveying mechanism 4 is fixedly mounted with a second synchronous pulley 75. The outer walls of the first synchronous pulley 77 and the second synchronous pulley 75 are both driven by the same synchronous belt. In this implementation scheme, the adjusting push rod 74 adopts an electric push rod structure, which can achieve precise angle adjustment within the range of 0-90° through an external controller. It can dynamically adjust the spray angle of the fan-shaped flat nozzle 11 and the contact pressure between the cleaning brush 8 and the scraper body 5 according to the adhesion strength of different powders, ensuring that the cleaning force field is always perpendicular to the working surface of the scraper. At the same time, a synchronous wheel transmission structure is adopted, which directly uses the rotating shaft 43 of the conveying mechanism 4 as the power source of the cleaning brush 8. This simplifies the equipment structure and ensures that the linear speed of the cleaning brush 8 and the running speed of the transmission chain 45 are precisely matched to form an effective relative motion to achieve thorough cleaning.

[0026] Specifically, the conveying mechanism 4 includes a rotating shaft 43 rotatably mounted on both sides of the frame 2. The rear end of the rotating shaft 43 on the left side is fixedly connected to the synchronous pulley 75. The front and rear parts of the outer wall of the rotating shaft 43 are fixedly mounted with transmission sprockets 44. The outer wall of the transmission sprockets 44 on the same side is mounted with transmission chains 45. The outer wall of the transmission chains 45 is fixedly connected to the disassembly assembly 6. The outer wall of the frame 2 and the position corresponding to the transmission sprockets 44 are fixedly mounted with protective covers 42. The outer wall of the protective cover 42 on the left side is hinged to the adjusting arm 71. One of the protective covers 42 has a drive motor 41 mounted on its outer wall. The power shaft of the drive motor 41 is fixedly connected to the corresponding rotating shaft 43 through a coupling. In this embodiment, the drive motor 41 adopts a variable frequency speed control motor, which can flexibly adjust the running speed according to the material conveying volume to adapt to different production capacity requirements. The protective cover 42 adopts a fully enclosed sheet metal structure, which can effectively block powdery materials from entering the meshing part of the transmission sprocket 44 and the transmission chain 45, preventing chain skipping, jamming and wear caused by powder accumulation. At the same time, it provides a stable hinge support point for the adjusting arm 71, ensuring the structural stability of the adjusting mechanism 7 during operation.

[0027] Specifically, the disassembly and assembly component 6 includes several bases 63 fixedly installed between the transmission chains 45. The bases 63 have a concave structure in the middle. A base platform 66 is installed on the top of the bases 63 through a locking mechanism 62. A replacement mechanism 61 is installed on the top of the base platform 66. The top of the replacement mechanism 61 is fixedly connected to the scraper body 5. The bottom wall of the base platform 66 has a convex structure and fits snugly with the concave structure in the middle of the base 63. A positioning seat 65 is fixedly installed on the convex part of the bottom wall of the base platform 66. A positioning hole 64 is opened in the concave part of the top of the base 63. The inner wall of the positioning hole 64 fits with the outer wall of the corresponding positioning seat 65 to form an installation positioning. In this embodiment, the base 63 and the platform 66 adopt a concave-convex stop fit structure. With the insertion of the positioning seat 65 and the positioning hole 64 for initial positioning, the scraper body 5 can be quickly and accurately aligned. After installation, it can effectively limit the radial and circumferential sway of the scraper and ensure that the gap between the scraper and the bottom of the conveyor frame 3 trough is uniform during the operation of the scraper.

[0028] Specifically, the locking mechanism 62 includes a mounting groove 621 formed at the front and rear of the bottom wall of the base 66. A rotating cylinder 624 is installed on the inner wall of the mounting groove 621. A cross fastener 625 is fixedly installed at the bottom of the rotating cylinder 624. A torsion handle 622 is fixedly installed on the top of the outer wall of the rotating cylinder 624. A locking groove 6213 is formed on the top wall of the base 63 at the position corresponding to the mounting groove 621. A cross passage groove 6214 is formed on the top wall of the base 63 at the position corresponding to the locking groove 6213. The cross fastener 625 can enter the locking groove 6213 through the cross passage groove 6214 and rotate the rotating cylinder 624 through the torsion handle 622 to form a misaligned arrangement with the cross passage groove 6214 to prevent it from falling out of the mounting groove 621. In this embodiment, the cross fastener 625 and the cross through groove 6214 adopt a clearance fit design, which has low insertion resistance and convenient alignment. After rotation, the protruding edge of the cross fastener 625 and the inner wall of the locking groove 6213 form a circumferential engagement to achieve primary axial locking. It can withstand the axial tensile force and shear force generated during the operation of the scraper, and will not automatically loosen under long-term vibration conditions of the equipment. The connection reliability is far higher than that of traditional bolt connections.

[0029] Specifically, a sliding ring 6211 is slidably installed on the outer wall of the rotating cylinder 624. Several positioning pins 6212 are uniformly fixedly installed on the bottom wall of the sliding ring 6211 in a circular pattern. Locking holes 626 are opened on the top wall of the cross fastener 625. The inner wall of the locking hole 626 is respectively attached to the outer wall of the corresponding positioning pin 6212. Several limiting holes 6215 are uniformly opened on the top wall of the base 63 at the position of the corresponding locking groove 6213. The positioning pin 6212 passes through the limiting hole 6215 and enters the locking hole 626 on the top wall of the corresponding cross fastener 625 to prevent the cross fastener 625 from rotating and disengaging from the locking groove 6213. In this implementation scheme, a multi-point locking structure with multiple circumferentially distributed positioning pins 6212 is adopted. Combined with the dual limiting of the limiting hole 6215 and the locking hole 626, a two-stage circumferential locking is achieved, which can completely prevent the cross fastener 625 from rotating and loosening during operation. Even if one of the positioning pins is worn, the remaining positioning pins can still ensure the locking reliability, which significantly improves the safety factor of the scraper connection structure.

[0030] Specifically, an abutment spring 6210 is installed between the top wall of the sliding ring 6211 and the mounting groove 621 and sleeved on the outer wall of the rotating cylinder 624. One end of the abutment spring 6210 is fixedly connected to the top wall of the sliding ring 6211, and the other end of the abutment spring 6210 is fixedly connected to the inner top wall of the mounting groove 621. An extension shaft 628 is slidably installed on the inner wall of the rotating cylinder 624. A guide groove 623 is opened on the outer wall of the rotating cylinder 624. A guide slider 629 is slidably installed on the inner wall of the guide groove 623. The outer wall of the guide slider 629 is fixedly connected to the outer wall of the extension shaft 628. A tension grip 627 is fixedly installed on the top end of the extension shaft 628. In this embodiment, the abutment spring 6210 is made of high-strength stainless steel, which can provide a continuous and stable elastic restoring force to ensure that the positioning pin 6212 is always firmly inserted into the locking hole 626. The mating structure of the guide groove 623 and the guide slider 629 not only realizes the axial sliding guidance of the extended shaft 628, but also transmits the rotational torque, so that the rotation of the stretching handle 627 can synchronously drive the rotating cylinder 624 and the cross fastener 625 to rotate. The entire locking mechanism can be unlocked and locked by simply pulling, rotating, pressing down, and releasing.

[0031] Specifically, the changing mechanism 61 includes a stabilizing seat 611 fixedly installed on the top of the base 66. A limiting cavity 612 is opened on the top of the stabilizing seat 611. A plurality of adjusting springs 616 are evenly installed on the inner wall of the limiting cavity 612. The top of each adjusting spring 616 is fixedly installed with the same slide 614. The outer wall of the slide 614 is slidably connected to the inner wall of the limiting cavity 612. A connecting seat 613 is fixedly installed on the top of the slide 614. The top of the connecting seat 613 is fixedly connected to the scraper body 5. In this embodiment, the adjusting springs 616 are evenly distributed at the bottom of the slide block 614 to provide elastic support for adjusting the extension length of the scraper.

[0032] Specifically, guide grooves 617 are provided on both the front and rear walls of the stabilizer 611, and guide seats 615 are slidably installed on the inner walls of the guide grooves 617. The guide seats 615 are fixedly connected to the slide 614. Locking shafts 618 are fixedly installed on both sides of the front and rear walls of the stabilizer 611 at the positions of the guide grooves 617. Four-jaw clips 619 are fixedly installed on the outer walls of the guide seats 615. The four-jaw clips 619 are symmetrically arranged and respectively snapped onto the outer walls of the corresponding locking shafts 618. In this embodiment, the mating structure of the guide groove 617 and the guide seat 615 provides precise guidance for the axial sliding of the slide 614, preventing the scraper body 5 from swaying during adjustment and operation; The four-jaw clamp 619 is made of elastic manganese steel, which has good elasticity and wear resistance. The four claws simultaneously engage in the annular groove of the locking shaft 618 to achieve multi-point synchronous locking. The locking force is uniform and the connection is firm. It can be flexibly adjusted according to the wear of the scraper and the height of the material accumulation to always ensure the best scraping effect.

[0033] A self-cleaning and anti-material-accumulation method for scraper chains includes the following steps: S1. Select a scraper body 5 with matching specifications. Insert the positioning seat 65 into the positioning hole 64 at the top of the base 63 to complete the initial positioning. Operate the stretch handle 627 to drive the outer shaft 628 and guide slider 629 upward and compress the abutment spring 6210. After rotation and alignment, press down the cross fastener 625 to pass through the cross through groove 6214 and enter the locking groove 6213. Rotate again to achieve circumferential locking. After releasing the stretch handle 627, the abutment spring 6210 returns to its original position. Push the positioning pin 6212 through the limit hole 6215 and insert it into the locking hole 626 to complete the double locking quick installation of the scraper body 5. S2. Press the four-claw clamp 619 to disengage it from the locking shaft 618 limit. Push and pull the scraper body 5 to drive the slide 614 and guide seat 615 to slide along the limiting cavity 612 and guide groove 617 respectively. After compressing the adjusting spring 616 to the appropriate scraping stroke, release the four-claw clamp 619 to elastically reset and engage the locking shaft 618 to realize the scraper extension length start adjustment push rod 74 to push the adjusting seat 73 and adjusting arm 71 to deflect. Simultaneously drive the fixed seat 72, cleaning brush 8, conveying pipe 10 and fan-shaped flat nozzle 11 to adjust to the optimal working tilt angle and match the powder cleaning incident angle and brush contact pressure. S3. Start the drive motor 41 to drive the rotating shaft 43, transmission sprocket 44 and transmission chain 45 to rotate in a cycle. The transmission chain 45 drives the disassembly and assembly assembly 6 and the scraper body 5 to make a closed-loop cycle along the inside of the frame 2. The powdery material enters the inside of the conveyor frame 3 from the feed end 32 and is continuously scraped and pushed by the scraper body 5 and finally discharged stably from the discharge end 31. S4. The external dry ice pumping equipment supplies dry ice particles to the conveying pipe 10. The particles are sprayed at high speed through the fan-shaped flat nozzle 11 onto the surface of the scraper body 5 that circulates through the cleaning station. The instantaneous temperature difference generated by the low temperature of the dry ice creates thermal stress, causing the powder layer on the scraper surface to crack and become brittle. At the same time, the dry ice penetrates into the gaps in the powder and instantly sublimates and expands in volume. Through the micro-explosion effect, the clumps of powder are dried and peeled off. No liquid water is generated throughout the process, which avoids the powder from becoming damp and sticky, and from caking and accumulating. This inhibits the scraper from sticking to the material and falling off the material from the source. S5, the rotation of the rotating shaft 43 drives the synchronous wheel 75 to drive the synchronous wheel 77 and the drive shaft 76 to rotate via the synchronous belt, so that the cleaning brush 8 and the transmission chain 45 rotate synchronously, gently sweeping away the fine powder that remains after the dry ice is peeled off and is only attached by static electricity or gravity. The cleaned-off powder flows directly into the main material flow at the discharge end 31, preventing the powder from scattering and accumulating at the cleaning station to form a dead corner for material accumulation.

[0034] Working principle: The drive motor 41 and adjusting push rod 74 of this device are electrically connected to the external power supply through a standardized wire layout. The model of the electrical control components can be flexibly selected from the existing standard parts system according to the actual working conditions. The signal input terminals of the above-mentioned electrical control components are precisely connected one-to-one with the signal output terminals of the external controller to ensure the real-time transmission and execution of control commands. The external dry ice pumping equipment is sealed and connected to the conveying pipe 10 to provide a stable source of dry ice particles for the cleaning system. To address the core shortcomings of existing technologies for scraper conveying of powdery materials, such as the difficulty in removing surface adhesion and the tendency for materials to clump and detach, leading to material accumulation and product quality issues, this paper proposes an online self-cleaning structure that integrates dry ice micro-explosion peeling and mechanical adaptive cleaning. Through a three-level collaborative innovative design of "quick-change adjustable scraper structure + dry ice jet thermal stress embrittlement + synchronous rotating brush fine cleaning", a multi-level physical cleaning mechanism is constructed, consisting of "thermal shock embrittlement - volume expansion micro-explosion - dry solid shedding - low-damage auxiliary cleaning". During normal scraper operation, the attached layer is actively eliminated, and the peeled material is directly incorporated into the main material flow in its dry original state. The following is a detailed description of the specific working principle and technical effects. Modular scraper for rapid adaptation and installation under multiple working conditions: Before starting work, preparatory work is carried out. First, select a suitable scraper body 5 according to the characteristics of the powdery material being conveyed, such as particle size, humidity, and adhesion. Addressing the shortcomings of existing technologies where the scraper is fixedly connected to the chain, replacement requires disassembling the entire chain, and it cannot quickly adapt to different materials, this invention designs a cross-shaped fastener and a double-locking positioning structure with a cross-shaped fastener and a positioning pin. The specific installation method is as follows: The movable base 66 drives the stabilizing seat 611 and the pre-installed scraper body 5 to the assembly station at the top of the base 63. The positioning seat 65 at the bottom of the base 66 is inserted into the positioning hole 64 at the top of the base 63 to form initial positioning, so that the outer convex stop of the base 66 and the inner concave stop of the base 63 are embedded and fitted, realizing dual radial and circumferential limiting, ensuring that there is no radial shaking during the operation of the scraper. First, pull the tension handle 627 upward to drive the extension rod 628 to slide axially inside the rotating cylinder 624. The guide slider 629 at the lower end of the extension rod 628 slides upward along the inner wall of the guide groove 623, which simultaneously drives the sliding ring 6211 and the positioning pin 6212 to move upward inside the mounting groove 621. At this time, the sliding ring 6211 compresses and abuts the spring 6210 to store energy. Then, rotate the tension handle 627 to drive the guide slider 629 to deflect inside the rotating cylinder 624. Due to the fitting and limiting effect of the guide slider 629 and the guide groove 623, the rotating cylinder 624 is driven by the rotational force to simultaneously drive the torsion handle 622 and the cross fastener 625 to rotate until the cross protrusion of the cross fastener 625 is aligned with the groove of the cross through groove 6214. Then, press down the torsion handle 622 to push the rotating cylinder 624 and the cross fastener 625 to descend axially, so that the cross fastener 625 passes through the cross through groove 6214 and enters the locking groove 6213. Next, rotating the torsion handle 622 synchronously drives the rotating cylinder 624 and the cross fastener 625 to deflect 45 degrees inside the locking groove 6213. At this time, the cross protrusion of the cross fastener 625 forms a circumferential engagement with the inner wall of the locking groove 6213. At the same time, the rotating cylinder 624 drives the sliding ring 6211 and the positioning pin 6212 to deflect 90 degrees synchronously through the extension rod 628 and the guide slider 629, so that the axis of the positioning pin 6212 coincides with the axis of the locking hole 626 and the limiting hole 6215. When the tension grip 627 is released, under the action of the elastic restoring force of the abutment spring 6210, the sliding ring 6211 is pushed in the opposite direction, which drives the positioning pin 6212 to pass through the limiting hole 6215 and insert into the locking hole 626 to achieve axial locking and prevent the cross fastener 625 from deflecting or falling off axially. The scraper body 5 and the base 63 can be reliably assembled through the above two-step quick operation. The whole process does not require disassembling any chain components. The replacement time of a single piece 5 is shortened, which greatly reduces maintenance downtime. Especially when conveying powdery materials of different properties, the appropriate wear-resistant, non-stick, or special scraper body 5 with a guide chute can be quickly replaced, which expands the material application range of the whole device to meet the powdery material conveying needs of multiple fields. Scraper extension length and load control of cleaning components: The extension scraping length of the scraper body 5 is dynamically adjusted according to the conveying rate, material accumulation height and adhesion strength to compensate for wear and ensure scraping efficiency. The specific adjustment process is as follows: Press the four claws of the movable four-jaw clamp 619 inward to make it elastically deform and disengage from the locking shaft 618. Then push and pull the scraper body 5 to drive the connecting seat 613 to slide inside the limiting cavity 612 of the stabilizing seat 611. The slide 614 at the end of the connecting seat 613 slides circumferentially along the inner wall of the limiting cavity 612. At the same time, the guide seats 615 on both sides of the slide 614 slide axially along the inner wall of the guide groove 617. At this time, the slide 614 compresses the adjusting spring 616, which synchronously drives the four-jaw clamp 619 to move axially along the locking shaft 618. When the scraper body 5 is adjusted to the preset extension length, the four claws of the four claws of the four claws are released and automatically locked into the annular grooves corresponding to the locking shaft 618 under the action of their own elastic restoring force, realizing multi-point synchronous locking. It can accurately control the gap between the scraper and the bottom of the trough according to the change of material conveying volume, which not only ensures the thoroughness of scraping, but also avoids hard friction between the scraper and the trough, effectively reducing running resistance and scraper wear. The adjusting push rod 74 at the top of the discharge end 31 is started synchronously. The end of the push rod pushes the adjusting seat 73 to rotate around the hinge axis, which drives the fixed seat 72 and the adjusting arm 71 to deflect synchronously. This allows the drive shaft 76, cleaning brush 8, mounting seat 9, conveying pipe 10 and fan-shaped flat nozzle 11 on the fixed seat 72 to be adjusted to the preset working angle. The spray angle corresponding to different materials can be preset by an external controller. Material conveying and active cleaning are linked in sequence: the drive motor 41 on the outer wall of the protective cover 42 is started, which drives the rotating shaft 43 to drive the corresponding transmission sprocket 44 to rotate. Through the meshing transmission of the transmission sprocket 44 and the transmission chain 45, the rotating shaft 43 and the transmission sprocket 44 on both sides of the frame 2 rotate synchronously and continuously. The transmission chain 45 drives the base 63, the base 66 and the scraper body 5 fixedly connected to it to make continuous cyclical movement along the guide rail inside the frame 2, continuously injecting powdery material into the feed end 32. After the material enters the conveying frame 3, it moves along the bottom of the conveying frame 3 to the discharge end 31 under the continuous scraping and pushing action of the scraper body 5, and finally is discharged from the discharge end 31 to complete the conveying. The cleaning process is not passive but actively intervened by an external controller at fixed frequency / time, which achieves precise interruption of the "generation-thickening-shedding" cycle of the attachment layer. In the traditional conveying process, powder will continue to adhere to the scraper surface due to its small particle size, easy moisture absorption, and easy electrostatic adsorption, which will increase the scraper's self-weight and the chain conveying tension. At the same time, after the attachment layer thickens, it will fall off irregularly and form clumps, which will mix with the fresh powder flow and cause uneven product quality. It will also accumulate and block the channel at the bottom of the tank. However, the present invention can remove the attachments on the scraper surface in real time during the conveying process through the subsequent collaborative cleaning system, so that the scraper is always kept clean, effectively reducing the chain running tension and the smooth conveying inside the conveyor frame 3, reducing the occurrence of material accumulation. Dry ice micro-explosion deep pre-cleaning: When the scraper body 5 passes the position of the left cleaning brush 8, the external dry ice pumping equipment continuously delivers dry ice into the conveying pipe 10 installed on the mounting base 9, and sprays it onto the scraping surface of the scraper body 5 through the fan-shaped flat nozzle 11. Because the dry ice temperature is low and the powder adhering to the surface of the scraper body 5 is at room temperature, the thermal stress generated by the instantaneous temperature difference will cause the powder layer to shrink rapidly. Because the thermal expansion coefficients of the metal substrate of the scraper body 5, the powder layer and the dry ice particles are different, internal stress is generated inside the adhering material, causing the agglomerated powder layer to crack and become brittle rapidly, losing its original adhesion and cohesion. At the same time, some dry ice particles will penetrate into the micropores and gaps of the powder agglomeration. The dry ice will rapidly sublimate into gaseous carbon dioxide at the moment of impact. This tiny physical "explosion" generated inside the adhering layer will instantly disintegrate and break the powder agglomeration, so that it is peeled off from the surface of the scraper body 5 in the form of dry solid particles or powder. Dry ice directly sublimates from solid to gas during the cleaning process without producing any liquid water. Therefore, the powder will not turn into mud like water washing, nor will it become sticky due to moisture, which will aggravate subsequent adhesion and accumulation. The stripped material always maintains its original dry solid powder form and can be directly transported to the downstream process along with fresh material to avoid material waste. The spray width of the fan-shaped flat nozzle 11 completely covers the entire working surface of the scraper body 5. Synchronous rotating brush for low-damage fine cleaning: Under the continuous rotation of the rotating shaft 43, the second synchronous wheel 75 rotates synchronously with the rotating shaft 43, and drives the first synchronous wheel 77 and the drive shaft 76 to rotate through the synchronous belt drive. The drive shaft 76 drives the cleaning brush 8 to rotate between the two fixed seats 72. In response to the problem that a small amount of powder that has lost its adhesion still temporarily stays on the scraper surface due to static electricity after dry ice spraying, this invention designs a rotating cleaning brush 8 that is synchronized with the chain running speed, which can gently sweep away the residual powder on the scraper surface. The cleaning brush 8 is made of soft nylon bristles, which ensures the cleaning effect without damaging the non-stick coating on the scraper surface. This avoids the problem of subsequent powder adhesion caused by scratches on the scraper surface. At the same time, the rotating brush will sweep the swept powder directly into the discharge end 31 to prevent the powder from accumulating below the cleaning station and forming secondary accumulation. Under normal operating conditions, the device can maintain the basic cleanliness of the scraper surface by relying on the continuous rotation of the cleaning brush 8. The external controller automatically starts the dry ice pumping equipment for deep cleaning, realizing the intelligent cleaning mode of "daily light sweeping + periodic deep cleaning", which minimizes dry ice consumption and operating costs while ensuring cleaning effect. Through the aforementioned three-level collaborative cleaning structure and active cleaning sequence control, the thickness of the powder adhesion layer on the scraper surface can be greatly reduced. The non-conductive, non-abrasive, and extremely dry properties of dry ice can effectively eliminate the accumulation of static electricity on the surface after cleaning, ensuring that the clean scraper does not have the conditions to quickly adsorb powder again for a considerable period of time. At the same time, the stripped material remains in a dry solid state throughout the process and is recovered simultaneously. There is no mud or large wet lumps left by traditional water washing within 3 days, which eliminates the problems of "dead corners of material accumulation" and "channel caking and blockage" from the root. It completely solves a series of problems caused by scraper surface adhesion, caking and falling off during the conveying of powdered materials, such as uneven product quality, blockage of conveying channels, and unplanned equipment downtime, which significantly improves the operational stability and conveying efficiency of the powdered material scraper conveying system.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A self-cleaning structure for a scraper chain, comprising a frame (2) and a support frame (1) mounted at the bottom of the frame (2), characterized in that: A conveying mechanism (4) is installed between the frames (2). A conveying frame (3) is installed at the bottom of the frame (2). A feed end (32) is installed at the right end of the conveying frame (3). A discharge end (31) is installed at the left end of the conveying frame (3). Several disassembly and assembly components (6) are evenly installed on the outer wall of the conveying mechanism (4). A scraper body (5) is fixedly installed on the outer wall of each disassembly and assembly component (6). The conveying mechanism (4) has a cleaning brush (8) installed on the left side via the adjustment mechanism (7) for cleaning residual powder that has lost its adhesion and is temporarily stuck on the surface of the scraper body (5) by gravity or static electricity. The top of the adjustment mechanism (7) is equipped with a conveying pipe (10) via the mounting base (9). Several fan-shaped flat nozzles (11) are evenly installed on the outer wall of the conveying pipe (10) to spray at high speed onto the powdery material layer attached to the scraper surface, and to perform thermal shock and micro-explosion peeling of the powdery material attached to the surface of the scraper body (5).

2. The self-cleaning structure of a scraper chain according to claim 1, characterized in that: The adjustment mechanism (7) includes an adjustment push rod (74) hinged to the top of the discharge end (31). The movable end of the adjustment push rod (74) is hinged to the same adjustment seat (73). The side walls of the conveying mechanism (4) are symmetrically hinged to adjustment arms (71). The left end of the adjustment arm (71) is fixedly mounted with a fixed seat (72). The top wall of the fixed seat (72) is fixedly connected to the bottom wall of the mounting seat (9). The side wall of the fixed seat (72) is fixedly connected to the adjustment seat (73). A drive shaft (76) is rotatably mounted between the fixed seats (72). The outer wall of the drive shaft (76) and located between the fixed seats (72) is fixedly connected to the cleaning brush (8). The rear end of the drive shaft (76) is fixedly mounted with a synchronous pulley (77) through the corresponding fixed seat (72) via a bearing. The rear end of the conveying mechanism (4) is fixedly mounted with a synchronous pulley (75). The outer walls of the synchronous pulley (77) and the synchronous pulley (75) are both driven by the same synchronous belt.

3. The self-cleaning structure of a scraper chain according to claim 1, characterized in that: The conveying mechanism (4) includes a rotating shaft (43) rotatably mounted on both sides of the frame (2). The rear end of the rotating shaft (43) on the left side is fixedly connected to the synchronous pulley (75). The front and rear parts of the outer wall of the rotating shaft (43) are fixedly mounted with transmission sprockets (44). The outer walls of the transmission sprockets (44) on the same side are all mounted with transmission chains (45). The outer walls of the transmission chains (45) are fixedly connected to the disassembly assembly (6). The outer walls of the frame (2) and the positions corresponding to the transmission sprockets (44) are all fixedly mounted with protective covers (42). The outer wall of the protective cover (42) on the left side is hinged to the adjusting arm (71). One of the protective covers (42) has a drive motor (41) mounted on its outer wall. The power shaft of the drive motor (41) is fixedly connected to the corresponding rotating shaft (43) through a coupling.

4. The self-cleaning structure of a scraper chain according to claim 1, characterized in that: The disassembly and assembly assembly (6) includes several bases (63) fixedly installed between the transmission chains (45). The bases (63) have a concave structure in the middle. A base platform (66) is installed on the top of the bases (63) through a locking mechanism (62). A replacement mechanism (61) is installed on the top of the base platform (66). The top of the replacement mechanism (61) is fixedly connected to the scraper body (5). The bottom wall of the base platform (66) has a convex structure and fits well with the concave structure in the middle of the base (63). A positioning seat (65) is fixedly installed on the convex part of the bottom wall of the base platform (66). A positioning hole (64) is opened in the concave part of the top of the base (63). The inner wall of the positioning hole (64) fits with the outer wall of the corresponding positioning seat (65) to form an installation positioning.

5. The self-cleaning structure of a scraper chain according to claim 4, characterized in that: The locking mechanism (62) includes a mounting groove (621) on the front and rear of the bottom wall of the base (66). A rotating cylinder (624) is installed on the inner wall of the mounting groove (621). A cross fastener (625) is fixedly installed at the bottom of the rotating cylinder (624). A torsion handle (622) is fixedly installed on the top of the outer wall of the rotating cylinder (624). A locking groove (6213) is provided on the top wall of the base (63) at the position corresponding to the mounting groove (621). A cross passage groove (6214) is provided on the top wall of the base (63) at the position corresponding to the locking groove (6213). The cross fastener (625) can enter the locking groove (6213) through the cross passage groove (6214) and rotate the rotating cylinder (624) by the torsion handle (622) to form a misaligned arrangement with the cross passage groove (6214) to prevent it from falling out of the mounting groove (621).

6. The self-cleaning structure of a scraper chain according to claim 5, characterized in that: A sliding ring (6211) is slidably installed on the outer wall of the rotating cylinder (624). Several positioning pins (6212) are evenly fixedly installed on the bottom wall of the sliding ring (6211) in a circular shape. Locking holes (626) are opened on the top wall of the cross fastener (625). The inner wall of the locking hole (626) is respectively attached to the outer wall of the corresponding positioning pin (6212). Several limiting holes (6215) are evenly opened on the top wall of the base (63) at the position of the corresponding locking groove (6213). The positioning pin (6212) passes through the limiting hole (6215) and enters the locking hole (626) on the top wall of the corresponding cross fastener (625) to prevent the cross fastener (625) from rotating and disengaging from the locking groove (6213).

7. The self-cleaning structure of a scraper chain according to claim 6, characterized in that: An abutment spring (6210) is installed between the top wall of the sliding ring (6211) and the mounting groove (621) and sleeved on the outer wall of the rotating cylinder (624). One end of the abutment spring (6210) is fixedly connected to the top wall of the sliding ring (6211), and the other end of the abutment spring (6210) is fixedly connected to the inner top wall of the mounting groove (621). An extension shaft (628) is slidably installed on the inner wall of the rotating cylinder (624). A guide groove (623) is opened on the outer wall of the rotating cylinder (624). A guide slider (629) is slidably installed on the inner wall of the guide groove (623). The outer wall of the guide slider (629) is fixedly connected to the outer wall of the extension shaft (628). A tension grip (627) is fixedly installed on the top end of the extension shaft (628).

8. The self-cleaning structure of a scraper chain according to claim 4, characterized in that: The changing mechanism (61) includes a stabilizing seat (611) fixedly installed on the top of the base (66). The top of the stabilizing seat (611) has a limiting cavity (612). A number of adjusting springs (616) are evenly installed on the inner wall of the limiting cavity (612). The top of each adjusting spring (616) is fixedly installed with the same slide (614). The outer wall of the slide (614) is slidably connected to the inner wall of the limiting cavity (612). The top of the slide (614) is fixedly installed with a connecting seat (613). The top of the connecting seat (613) is fixedly connected to the scraper body (5).

9. The self-cleaning structure of a scraper chain according to claim 8, characterized in that: The front and rear walls of the stabilizer (611) are provided with guide grooves (617), and guide seats (615) are slidably installed on the inner walls of the guide grooves (617). The guide seats (615) are fixedly connected to the slide (614). Locking shafts (618) are fixedly installed on the front and rear walls of the stabilizer (611) at the positions on both sides of the guide grooves (617). Four-jaw clips (619) are fixedly installed on the outer walls of the guide seats (615). The four-jaw clips (619) are symmetrically arranged and respectively snapped onto the outer walls of the corresponding locking shafts (618).

10. A self-cleaning and anti-material-accumulation method for a scraper chain, comprising a self-cleaning structure for a scraper chain according to any one of claims 1-9, characterized in that: Includes the following steps; S1. Insert the scraper body (5) into the positioning hole (64) through the positioning seat (65) for initial positioning. Operate the stretch handle (627) to make the cross fastener (625) pass through the cross through groove (6214) and enter the locking groove (6213) and rotate to lock it. After releasing, the abutment spring (6210) pushes the positioning pin (6212) to insert into the locking hole (626) to complete the double locking installation. S2. Press the four-claw clamp (619) to disengage from the locking shaft (618), push and pull the scraper body (5) to adjust the extension length and then reset the clamp; start the adjusting push rod (74) to drive the cleaning brush (8) and the fan-shaped flat nozzle (11) to adjust to the working tilt angle; S3. Start the drive motor (41) to drive the transmission chain (45) and scraper body (5) to run in a cycle, scraping the powder from the feed end (32) to the discharge end (31) for discharge; S4. Dry ice particles are sprayed at high speed onto the surface of the scraper body (5) through the fan-shaped flat nozzle (11) to peel off the bonded powder by using thermal shock and micro-explosion effect. There is no liquid water throughout the process. S5, Synchronous wheel 2 (75) drives the cleaning brush (8) and the transmission chain (45) to rotate synchronously through the synchronous belt, sweeping away residual powder and flowing into the main material flow to prevent material accumulation.

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