An automatic powder return device

Abstract

The application belongs to the field of automatic powder returning devices, and particularly relates to an automatic powder returning device, which comprises a powder returning box, two groups of powder receiving covers arranged on the two sides of the powder returning box, a powder receiving annular groove arranged in the powder returning box, two groups of chains symmetrically arranged on the two sides of the powder receiving annular groove, four groups of ratchets engaged with the chains, rotating shafts connected with the ratchets, a plurality of powder returning scrapers arranged between the two groups of chains, a feeding opening formed in the upper end of the powder returning box, a powder scattering box arranged directly below the feeding opening, a sieve plate arranged in the powder scattering box, a vibrating motor for vibrating the sieve plate, a powder scattering roller rotatably connected with the lower end of the powder scattering box, and a scraper main body, wherein the plurality of scraper main bodies are distributed at equal angles in the powder receiving annular groove, and two groups of supporting shafts are symmetrically arranged on the two sides of the scraper main body, so that the hot melt powder separated from the printing film and the excessive hot melt powder can be automatically collected and poured into the powder scattering box, the automatic rate of the device is improved, the hot melt powder can be returned to the powder scattering box in a short time, and the hot melt powder recycling efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of automatic powder return devices, specifically an automatic powder return device. Background Technology

[0002] In the printing process of heat transfer film and other film products, one important step is to sprinkle hot melt powder on the printed pattern on the heat transfer film after printing and then dry it. This allows the hot melt powder to melt and combine with the printing ink, ensuring that the printed pattern is cured on the heat transfer film.

[0003] Publication No. CN213590999U discloses a powder-spreading mechanism for a hot melt adhesive laminating machine. The mechanism includes a frame, a powder hopper at the top of the frame, a powder-spreading roller at the bottom of the hopper, and the powder-spreading roller rotatably connected to the frame. A drive motor is mounted on one side of the frame to rotate the powder-spreading roller. A screen is located below the powder-spreading roller and is movably connected to the frame. A recovery hopper is located below the screen, and a channel for the adhesive material to pass through is provided between the screen and the recovery hopper. The screen is connected to the drive motor via a linkage mechanism, which drives the linkage mechanism to cause the screen to reciprocate and vibrate. This invention provides a powder-spreading mechanism for laminating machines that offers advantages such as reduced processing costs, reduced noise pollution, reduced labor intensity for workers, and improved processing efficiency.

[0004] In the above scheme, the bottom of the recycling hopper is provided with a discharge port, which facilitates the sliding of the adhesive powder along the inner wall of the recycling hopper to the discharge port. The discharge port is detachably connected to a collection bag. The adhesive powder falls into the collection bag through the discharge port, which is easy for workers to collect. The collection bag can be fixed to the discharge port by a rope or hook, so that after collection, the worker can remove the collection bag from the discharge port. The discharge port is close to the side of the frame, so that the worker can take the collection bag out from under the frame and drag it back into the powder hopper for use. It can be seen that the return of the powder to the powder hopper requires manual operation, and the powder takes a long time to accumulate a certain amount in the collection bag before the collection bag can be removed. This not only results in low automation of the device, but also makes it impossible for the collected powder to return to the powder hopper in a timely manner, reducing the powder recycling efficiency. Therefore, the present invention provides an automatic powder return device. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: An automatic powder return device of this invention includes a powder return box, two sets of powder receiving covers on both sides of the powder return box, a powder receiving annular groove inside the powder return box, two sets of chains symmetrically arranged on both sides of the powder receiving annular groove, the chains engaging four sets of ratchet wheels, the ratchet wheels connected to a rotating shaft, multiple sets of powder return scrapers between the two sets of chains, a feed inlet at the upper end of the powder return box, a powder spreading box directly below the feed inlet, a sieve plate inside the powder spreading box, a vibrating motor for vibrating the sieve plate, and a rotatable connection at the lower end of the powder spreading box to a sieve plate. The powder roller and return scraper include: a scraper body, multiple scraper bodies distributed at equal angles in the powder receiving annular groove, two sets of support shafts symmetrically arranged on both sides of the scraper body, a fixed plate rotatably connected to the support shafts, a chain fixedly connected to the fixed plate, a first spring fixedly installed on the fixed plate, and a flipping vibration mechanism. The flipping vibration mechanism includes a guide shaft, which is fixedly installed on one side of the scraper body. One end of the first spring is engaged with the guide shaft. A guide frame is provided on one side of the feed inlet. The guide frame drives the guide shaft to flip the scraper body.

[0007] The scraper body moves continuously with the chain, automatically collecting and pouring the detached printing film and excess hot melt powder into the powder dispensing box. This not only improves the automation rate of the device, but also allows the hot melt powder to return to the powder dispensing box in a short time, thus improving the hot melt powder recycling efficiency.

[0008] Preferably, the overturning vibration mechanism further includes: a pressure shaft, a guide shaft that is movably connected to the pressure shaft, a slot at one end of the pressure shaft, a receiving block that is movably connected to the slot, a second spring sleeved on the receiving block, a rotary shaft that is fixedly connected to the receiving block, a striking block for striking the scraper body, the striking block being in contact with the scraper body, and a spring bar that is close to the back side of the striking block, the spring bar being fixedly installed on the scraper body, a number of triangular teeth are evenly arranged on the guide frame, the triangular teeth being used to push the pressure shaft, two sets of spiral grooves are opened on the guide shaft, two sets of convex shafts are welded on the pressure shaft, the convex shafts are driven along the spiral grooves to rotate the pressure shaft, the rotary shaft is rotatably connected to the scraper body, and the striking block is fixedly installed on the rotary shaft;

[0009] The scraper bucket body will be repeatedly struck by the striking block. The repeated striking will cause the scraper bucket body to vibrate continuously. The vibration will cause the attached hot melt powder to detach from the inner wall of the scraper bucket body, thereby making the hot melt powder in the scraper bucket body more thoroughly cleaned.

[0010] Preferably, the lower end of the powder dispensing box is provided with a cleaning mechanism for cleaning the hot melt powder adhering to the powder dispensing roller. The cleaning mechanism includes: a roller brush, the roller brush being in close contact with the powder dispensing roller; two sets of L-shaped brackets for supporting both ends of the roller brush; several sets of agitator strips equidistantly located on one side of the roller brush, the agitator strips being used to shake off the hot melt powder adhering to the roller brush; and a fixing block for fixing the agitator strips. The two sets of L-shaped brackets are symmetrically installed on both sides of the lower end of the powder dispensing box, and the fixing block is fixedly installed on the powder dispensing box.

[0011] As the roller brush rotates, the fibers on the roller brush sweep away the hot melt powder adhering to the powder spreading roller, keeping the outer surface of the powder spreading roller clean, thereby ensuring the powder spreading efficiency of the hot melt powder. At the same time, as the roller brush rotates, the static agitator will continuously touch the fibers on the roller brush, causing the hot melt powder adhering between the fibers to be shaken off, keeping the roller brush clean, thereby ensuring that the roller brush maintains a good cleaning effect on the powder spreading roller.

[0012] Preferably, the roller brush includes: a brush body, the brush body being in close contact with the powder-spreading roller, a rectangular hole formed on the brush body, a rectangular shaft movably inserted into the rectangular hole, and a guide rod fixedly installed at the end of the brush body. Two sets of L-shaped brackets are rotatably connected to both ends of the brush body. An oblique annular groove is formed on one set of L-shaped brackets. One end of the guide rod extends into the oblique annular groove, and the end of the actuating bar extends into the fiber filaments on the brush body. The guide rod is driven along the oblique annular groove to make the brush body move back and forth axially.

[0013] The brush body drives the guide rod to slide along the inclined annular groove. Guided by the inclined annular groove, the brush body and the guide rod move back and forth along the rectangular axis. Therefore, the brush body moves back and forth during the rotation, which makes the agitator bar contact the fiber filaments on the brush body more fully, so that the hot melt powder attached to the roller brush is cleaned more thoroughly.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. As the scraper moves along the bottom of the powder receiving annular groove, the hot melt powder accumulated at the bottom of the groove is shoveled into the scraper body. With chain drive, the scraper body, along with the hot melt powder and other components, moves to the inlet. The guide shaft slides along the guide frame, which presses against the guide shaft, causing the scraper body to flip downwards around the support shaft. The guide shaft also stretches the first spring, causing the hot melt powder sliding along the guide frame to be poured into the powder dispensing box. This continues until the guide shaft moves away from the guide frame. Under the rebound force of the first spring, the scraper body returns to its initial state. Compared with existing technologies, the scraper body moves continuously with the chain, automatically collecting and pouring excess hot melt powder that has detached from the printing film into the powder dispensing box. This not only improves the automation rate of the device but also allows the hot melt powder to return to the powder dispensing box in a short time, thus improving the hot melt powder recovery efficiency.

[0016] 2. As the guide shaft slides along the guide frame, it will stop rotating after the scraper bucket body has rotated a certain angle. At this time, the guide shaft continues to slide along the guide frame. At the same time, the other end of the bearing shaft on the guide shaft is squeezed by a set of triangular teeth. The squeeze causes the bearing shaft to slide into the guide shaft and compress the second spring. Simultaneously, the bearing shaft drives two sets of convex shafts to slide along two sets of spiral grooves. Under the guidance of the spiral grooves, the bearing shaft rotates. The bearing shaft drives the receiving block, the screw shaft, and the striking block to rotate together through the slot. The striking block squeezes the spring strip and bends it until the other end of the bearing shaft is offset by a set of triangular teeth. Under the rebound force of the second spring and the spring strip, the striking block flips back and strikes the scraper bucket body. Similarly, since the bearing shaft will pass through multiple sets of triangular teeth, the scraper bucket body will be struck by the striking block multiple times. The continuous striking causes the scraper bucket body to vibrate continuously. The vibration causes the attached hot melt powder to detach from the inner wall of the scraper bucket body, thus making the hot melt powder in the scraper bucket body cleared more thoroughly.

[0017] 3. As the powder-spreading roller rotates, a third set of motors drives the roller-type brush to rotate. The roller-type brush rotates in the same direction as the powder-spreading roller. As the roller-type brush rotates, the fibers on the roller-type brush sweep off the hot melt powder adhering to the powder-spreading roller, maintaining the cleanliness of the outer surface of the powder-spreading roller, thereby ensuring the powder-spreading efficiency of the hot melt powder. At the same time, as the roller-type brush rotates, the static agitator strip will continuously touch the fibers on the roller-type brush, causing the hot melt powder adhering between the fibers to be shaken off, keeping the roller-type brush clean, thereby ensuring that the roller-type brush maintains a good cleaning effect on the powder-spreading roller.

[0018] 4. The third set of motors drives the rectangular shaft to rotate. The rectangular shaft drives the brush body to rotate through the rectangular hole. The rotating brush body cleans the powder-spreading roller. At the same time, the brush body drives the guide rod to slide along the inclined annular groove. Under the guidance of the inclined annular groove, the brush body and the guide rod move back and forth along the rectangular shaft. Therefore, the brush body moves back and forth during the rotation process, so that the agitator strip and the fiber filaments on the brush body can make more full contact, thereby making the hot melt powder attached to the roller brush more thoroughly cleaned. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a cross-sectional view of the structure of the present invention.

[0022] Figure 3 This is a schematic diagram of a partial assembly of the chain, powder return scraper, and guide frame of the present invention.

[0023] Figure 4This is a schematic diagram of the cross-sectional view of the guide shaft, the cross-sectional view of the bearing shaft, the slot, the receiving block, the second spring, and the rotating shaft assembly of the present invention.

[0024] Figure 5 This is a schematic diagram of the powder-spreading box, powder-spreading roller, and cleaning mechanism combination of the present invention.

[0025] Figure 6 This is a schematic diagram of the cleaning mechanism of the present invention.

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0027] In the diagram: 1. Powder return box; 2. Powder receiving hood; 3. Powder receiving annular groove; 4. Chain; 5. Ratchet; 6. Rotating shaft; 7. Powder return scraper; 8. Feed inlet; 9. Powder spreading box; 10. Sieve plate; 11. Vibrating motor; 12. Powder spreading roller; 13. Guide frame; 131. Triangular tooth; 14. Cleaning mechanism; 701. Scraper body; 702. Support shaft; 703. Fixing plate; 704. First spring; 705. Tilting vibration mechanism; 7051. Guide shaft; 51 1. Spiral groove; 7052. Pressure bearing shaft; 521. Convex shaft; 7053. Slot; 7054. Receiving block; 7055. Second spring; 7056. Rotary shaft; 7057. Striking block; 7058. Spring bar; 141. Roller brush; 142. L-shaped bracket; 1421. Angled annular groove; 143. Actuating bar; 144. Fixing block; 1411. Brush body; 1412. Rectangular hole; 1413. Rectangular shaft; 1414. Guide rod. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] Example 1

[0030] like Figures 1 to 3As shown in the embodiment of the present invention, an automatic powder return device includes a powder return box 1, two sets of powder receiving covers 2 on both sides of the powder return box 1, a powder receiving annular groove 3 inside the powder return box 1, two sets of chains 4 symmetrically arranged on both sides of the powder receiving annular groove 3, the chains 4 engaging four sets of ratchet wheels 5, the ratchet wheels 5 connected to a rotating shaft 6, multiple sets of powder return scrapers 7 between the two sets of chains 4, a feed inlet 8 at the upper end of the powder return box 1, a powder spreading box 9 directly below the feed inlet 8, a sieve plate 10 inside the powder spreading box 9, a vibrating motor 11 for vibrating the sieve plate 10, and a powder spreading roller 12 rotatably connected to the lower end of the powder spreading box 9. The powder return scraper 7 includes: a scraper body 701, and multiple sets of scraper bodies 701. Two sets of support shafts 702 are symmetrically arranged on both sides of the scraper body 701, with equal angles distributed in the powder receiving annular groove 3. A fixed plate 703 is rotatably connected to the support shafts 702. A chain 4 is fixedly connected to the fixed plate 703. A first spring 704 is fixedly installed on the fixed plate 703. A flipping vibration mechanism 705 is also provided. The flipping vibration mechanism 705 includes a guide shaft 7051, which is fixedly installed on one side of the scraper body 701. One end of the first spring 704 is engaged with the guide shaft 7051. A guide frame 13 is provided on one side of the feed inlet 8. The guide shaft 7051 is driven along the guide frame 13 to flip the scraper body 701.

[0031] Specifically, in the initial state, the end of the scraper body 701 is fitted with the inner ring of the powder receiving annular groove 3. Several sets of sieve holes are opened on the sieve plate 10. A gap is left between the outer ring of the powder-spreading roller 12 and one side of the lower end of the powder-spreading box 9. When spreading powder on the printing film, hot melt powder is poured into the powder-spreading box 9 from the feed port 8, and the hot melt powder falls onto the sieve plate 10. The vibration motor 11 is started, causing the sieve plate 10 to vibrate. As the sieve plate 10 vibrates continuously, the sieve holes on the sieve plate 10 filter out impurities in the hot melt powder, and the qualified hot melt powder falls through the sieve holes onto the powder-spreading roller 12. A set of motors drives the powder-spreading roller 12. As the powder-spreading roller 12 rotates, hot melt powder falls through the gap between the outer ring of the powder-spreading roller 12 and the lower port of the powder-spreading box 9, forming a powder curtain. This achieves uniform application of hot melt powder onto the printing film. During the powder application process, excess hot melt powder that detaches from the printing film falls directly into the bottom of the powder-receiving annular groove 3 or into the powder-receiving cover 2. The hot melt powder slides along the powder-receiving cover 2 into the bottom of the powder-receiving annular groove 3. At this time, another set of motors drives a set of rotating shafts 6 to rotate along with two sets of ratchet wheels 5. As the two sets of ratchet wheels 5 rotate, the two sets of chains 4 move in a circular motion around the corresponding four sets of ratchet wheels 5. The two sets of chains 4 will carry... The multiple sets of return scraper buckets 7 move along the powder receiving annular groove 3. When the return scraper buckets 7 move along the bottom of the powder receiving annular groove 3, the hot melt powder accumulated at the bottom of the powder receiving annular groove 3 will be shoveled into the scraper bucket body 701. With the transmission of the chain 4, the scraper bucket body 701, together with the hot melt powder and other components, will move to the feed inlet 8, and the guide shaft 7051 will slide along the guide frame 13. The guide frame 13 squeezes the guide shaft 7051, causing the scraper bucket body 701 to flip downward about the support shaft 702 as the axis, and the guide shaft 7051 stretches the first spring 704, causing the guide shaft 7051 to slide along the guide frame. The hot melt powder in the sliding section 13 is poured into the powder dispensing box 9 until the guide shaft 7051 is offset from the guide frame 13. Under the rebound force of the first spring 704, the scraper body 701 returns to the initial state. Compared with the prior art, the scraper body 701 moves continuously with the chain 4. The detached printing film and excess hot melt powder will be recycled into the powder dispensing box 9 by the scraper body 701. The detached printing film and excess hot melt powder are automatically collected and poured into the powder dispensing box 9, which not only improves the automation rate of the device, but also allows the hot melt powder to return to the powder dispensing box 9 in a short time, thus improving the hot melt powder recycling efficiency.

[0032] like Figure 3 and Figure 4As shown, the flipping vibration mechanism 705 further includes: a pressure bearing shaft 7052, a guide shaft 7051 movably inserted into the pressure bearing shaft 7052, a slot 7053 formed at one end of the pressure bearing shaft 7052, a receiving block 7054 movably inserted into the slot 7053, a second spring 7055 sleeved on the receiving block 7054, a screw shaft 7056 fixedly connected to the receiving block 7054, a striking block 7057 for striking the scraper body 701, the striking block 7057 fitting against the scraper body 701, and a backing tightly fitted against the striking block 7057. The side spring bar 7058 is fixedly installed on the scraper body 701. Several sets of triangular teeth 131 are evenly arranged on the guide frame 13. The triangular teeth 131 are used to push the pressure bearing shaft 7052. Two sets of spiral grooves 511 are opened on the guide shaft 7051. Two sets of convex shafts 521 are welded on the pressure bearing shaft 7052. The convex shafts 521 are driven along the spiral grooves 511 to rotate the pressure bearing shaft 7052. The screw shaft 7056 is rotatably connected to the scraper body 701. The striking block 7057 is fixedly installed on the screw shaft 7056.

[0033] Specifically, when the scraper body 701 is flipped to pour hot melt powder into the powder dispensing box 9, a small amount of hot melt powder adheres to the inner wall of the scraper body 701 and cannot be removed from the scraper body 701. This results in the hot melt powder not being thoroughly removed from the scraper body 701. Therefore, during the sliding of the guide shaft 7051 along the guide frame 13, after the scraper body 701 has flipped to a certain angle, it will stop flipping. At this time, the guide shaft 7051 continues to slide along the guide frame 13. At the same time, the other end of the pressure shaft 7052 on the guide shaft 7051 is squeezed by a set of triangular teeth 131. The squeeze causes the pressure shaft 7052 to slide towards the inside of the guide shaft 7051 and compress the second spring 7055. Simultaneously, the pressure shaft 7052 drives the two sets of convex shafts 521 to slide along the two sets of spiral grooves 511. Under the guidance of the spiral grooves 511, the pressure shaft 7052... When the pressure shaft 7052 rotates, it drives the receiving block 7054, the rotating shaft 7056, and the striking block 7057 to rotate together through the slot 7053. The striking block 7057 also compresses the spring strip 7058 and bends it until the other end of the pressure shaft 7052 is offset by a set of triangular teeth 131. Under the rebound force of the second spring 7055 and the spring strip 7058, the striking block 7057 flips back and strikes the scraper body 701. Similarly, since the pressure shaft 7052 will pass through multiple sets of triangular teeth 131, the scraper body 701 will be struck by the striking block 7057 repeatedly. The repeated striking causes the scraper body 701 to vibrate continuously. The vibration causes the attached hot melt powder to detach from the inner wall of the scraper body 701, thereby making the hot melt powder in the scraper body 701 more thoroughly cleaned.

[0034] Example 2

[0035] like Figure 5As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a cleaning mechanism 14 for cleaning hot melt powder adhering to the powder spreading roller 12 is provided at the lower end of the powder spreading box 9. The cleaning mechanism 14 includes: a roller brush 141, the roller brush 141 is close to the powder spreading roller 12, two sets of L-shaped brackets 142 for supporting the two ends of the roller brush 141, several sets of agitator strips 143 are equidistantly located on one side of the roller brush 141, the agitator strips 143 are used to shake off the hot melt powder adhering to the roller brush 141, and a fixing block 144 fixedly connected to the agitator strips 143. The two sets of L-shaped brackets 142 are symmetrically installed on both sides of the lower end of the powder spreading box 9, and the fixing block 144 is fixedly installed on the powder spreading box 9.

[0036] Specifically, as the powder-spreading roller 12 rotates continuously, hot melt powder is sprinkled out from the lower end of the powder-spreading box 9. However, a small amount of hot melt powder adheres to the powder-spreading roller 12. As the amount of hot melt powder adhering to the powder-spreading roller 12 increases, the gap between the powder-spreading roller 12 and the lower end of the powder-spreading box 9 will decrease, reducing the amount of hot melt powder passing through and thus affecting the efficiency of hot melt powder being sprinkled out of the powder-spreading box 9. Therefore, when the powder-spreading roller 12 rotates, the roller brush 141 is driven to rotate by the third set of motors. The roller brush 141 rotates in the same direction as the powder-spreading roller 12. As the roller brush 141 rotates, the fibers on the roller brush 141 sweep away the hot melt powder adhering to the powder spreading roller 12, keeping the outer surface of the powder spreading roller 12 clean, thereby ensuring the powder spreading efficiency of the hot melt powder. At the same time, as the roller brush 141 rotates, the static agitator 143 will continuously touch the fibers on the roller brush 141, causing the hot melt powder adhering between the fibers to be shaken off, keeping the roller brush 141 clean, thereby ensuring that the roller brush 141 maintains a good cleaning effect on the powder spreading roller 12.

[0037] like Figure 6 and Figure 7 As shown, the roller brush 141 includes: a brush body 1411, which is in close contact with the powder-spreading roller 12; a rectangular hole 1412 formed on the brush body 1411; a rectangular shaft 1413 movably inserted into the rectangular hole 1412; and a guide rod 1414 fixedly installed at the end of the brush body 1411. Two sets of L-shaped brackets 142 are rotatably connected to both ends of the brush body 1411. An oblique annular groove 1421 is formed on one set of L-shaped brackets 142. One end of the guide rod 1414 extends into the oblique annular groove 1421. The end of the actuating bar 143 extends into the fiber filaments on the brush body 1411. The guide rod 1414 is driven along the oblique annular groove 1421 to make the brush body 1411 reciprocate back and forth in the axial direction.

[0038] Specifically, because several sets of actuating strips 143 are spaced apart, and there is a distance between adjacent actuating strips 143, the fibers on the roller brush 141 cannot fully contact the actuating strips 143, resulting in insufficient cleaning of the hot melt powder adhering to the roller brush 141. Therefore, when the third set of motors drives the roller brush 141 to rotate, the third set of motors also drives the rectangular shaft 1413 to rotate. The rectangular shaft 1413 drives the brush body 1411 to rotate through the rectangular hole 1412. The rotating brush body 1411 achieves cleaning of the brush body 1411. While the powder-spraying roller 12 is cleaning, the brush body 1411 drives the guide rod 1414 to slide along the inclined annular groove 1421. Under the guidance of the inclined annular groove 1421, the brush body 1411 and the guide rod 1414 move back and forth along the rectangular axis 1413. Therefore, the brush body 1411 moves back and forth during the rotation process, so that the agitator 143 and the fiber filaments on the brush body 1411 are in more sufficient contact, thereby making the hot melt powder attached to the roller brush 141 more thoroughly cleaned.

[0039] Working principle: Hot melt powder is poured into the powder spreading box 9 from the feed port 8 and falls onto the screen plate 10. The vibration motor 11 is started, which causes the screen plate 10 to vibrate. As the screen plate 10 vibrates continuously, the screen holes on the screen plate 10 filter out impurities in the hot melt powder, and the qualified hot melt powder falls onto the powder spreading roller 12 through the screen holes. The powder spreading roller 12 is driven to rotate by a set of motors. As the powder spreading roller 12 rotates, the hot melt powder falls through the gap between the outer ring of the powder spreading roller 12 and the lower port of the powder spreading box 9 to form a powder curtain, thereby achieving the uniform spreading of hot melt powder on the printing film.

[0040] During the powder application process, excess hot melt powder and detached printing film will fall directly into the bottom of the powder receiving annular groove 3 or into the powder receiving cover 2. The hot melt powder will slide along the powder receiving cover 2 into the bottom of the powder receiving annular groove 3. At this time, another set of motors drives a set of rotating shafts 6 to rotate together with two sets of ratchet wheels 5. As the two sets of ratchet wheels 5 rotate, the two sets of chains 4 will make circular motion around the corresponding four sets of ratchet wheels 5. The two sets of chains 4 will drive multiple sets of return powder scrapers 7 to move along the powder receiving annular groove 3. When the return powder scrapers 7 move along the bottom of the powder receiving annular groove 3, the hot melt powder accumulated at the bottom of the powder receiving annular groove 3 will be... The hot melt powder is shoveled into the scraper body 701. Driven by the chain 4, the scraper body 701, along with the hot melt powder and other components, moves to the feed inlet 8. The guide shaft 7051 slides along the guide frame 13, which compresses the guide shaft 7051, causing the scraper body 701 to flip downwards about the support shaft 702. The guide shaft 7051 also stretches the first spring 704, causing the hot melt powder to be poured into the powder distribution box 9. After the scraper body 701 flips to a certain angle, it stops flipping. At this point, the guide shaft 7051 continues to slide along the guide frame 13. As the guide frame 13 slides, the other end of the pressure shaft 7052 on the guide shaft 7051 is squeezed by a set of triangular teeth 131. The squeezing causes the pressure shaft 7052 to slide inward toward the guide shaft 7051 and compress the second spring 7055. At the same time, the pressure shaft 7052 drives the two sets of convex shafts 521 to slide along the two sets of spiral grooves 511. Under the guidance of the spiral grooves 511, the pressure shaft 7052 rotates. The pressure shaft 7052 drives the receiving block 7054, the screw shaft 7056, and the striking block 7057 to rotate together through the slot 7053. The striking block 7057 squeezes... The pressure bar 7058 bends until the other end of the pressure shaft 7052 is offset by a set of triangular teeth 131. Under the rebound force of the second spring 7055 and the pressure bar 7058, the striking block 7057 flips back and strikes the scraper body 701. Similarly, since the pressure shaft 7052 will pass through multiple sets of triangular teeth 131, the scraper body 701 will be struck by the striking block 7057 repeatedly until the guide shaft 7051 is offset from the guide frame 13. Under the rebound force of the first spring 704, the scraper body 701 returns to its initial state.

[0041] When the powder-spreading roller 12 rotates, the third set of motors drives the rectangular shaft 1413 to rotate. The rectangular shaft 1413 drives the brush body 1411 to rotate through the rectangular hole 1412. The rotating brush body 1411 cleans the powder-spreading roller 12. At the same time, the brush body 1411 drives the guide rod 1414 to slide along the inclined annular groove 1421. Under the guidance of the inclined annular groove 1421, the brush body 1411 and the guide rod 1414 move back and forth along the rectangular shaft 1413. The static agitator bar 143 will continuously touch the fiber filaments on the roller brush 141, causing the hot melt powder attached between the fiber filaments to be shaken off.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic refill device comprising a refill tank (1), characterized in that: Two groups of powder receiving covers (2) are arranged on both sides of the powder returning box (1), a powder receiving annular groove (3) is arranged in the powder returning box (1), two groups of chains (4) are symmetrically arranged in the powder receiving annular groove (3), the chains (4) engage four groups of ratchets (5), the ratchets (5) are connected with rotating shafts (6), a plurality of powder returning scrapers (7) are arranged between the two groups of chains (4), an inlet (8) is formed at the upper end of the powder returning box (1), a powder scattering box (9) is arranged below the inlet (8), a sieve plate (10) is arranged in the powder scattering box (9), a vibrating motor (11) is arranged for vibrating the sieve plate (10), and a powder scattering roller (12) is rotatably connected to the lower end of the powder scattering box (9). The powder returning scraper (7) comprises: a scraper main body (701), a plurality of groups of the scraper main bodies (701) are distributed at equal angles in the powder receiving annular groove (3); two groups of support shafts (702) are symmetrically arranged on both sides of the scraper main body (701); a fixed plate (703) is rotatably connected with the support shaft (702), and the fixed plate (703) is fixedly connected with the chain (4); a first spring (704) is fixedly installed on the fixed plate (703); and a turnover vibration mechanism (705), the turnover vibration mechanism (705) comprises a guide shaft (7051), the guide shaft (7051) is fixedly installed on one side of the scraper main body (701), one end of the first spring (704) is clamped on the guide shaft (7051), a guide frame (13) is arranged on one side in the inlet (8), and the guide frame (13) is used for driving the guide shaft (7051) to make the scraper main body (701) turn over. The turnover vibration mechanism (705) further comprises: a pressure bearing shaft (7052), the pressure bearing shaft (7052) is movably inserted into the guide shaft (7051); a slot (7053) is formed in one end of the pressure bearing shaft (7052); a receiving block (7054) is movably inserted into the slot (7053); a second spring (7055) is sleeved on the receiving block (7054); a screw shaft (7056) is fixedly connected with the receiving block (7054); a knocking block (7057) is used for knocking the scraper main body (701), and the knocking block (7057) is attached to the scraper main body (701); and a spring strip (7058) is attached to the back side of the knocking block (7057), and the spring strip (7058) is fixedly installed on the scraper main body (701). A plurality of groups of triangular teeth (131) are equidistantly arranged on the guide frame (13), and the triangular teeth (131) are used for pushing the pressure bearing shaft (7052).

2. An automatic refill device according to claim 1, characterized in that: Two groups of spiral sliding grooves (511) are formed in the guide shaft (7051), and two groups of convex shafts (521) are welded on the pressure bearing shaft (7052), the convex shafts (521) are driven along the spiral sliding grooves (511) to rotate the pressure bearing shaft (7052).

3. An automatic refill device according to claim 2, wherein: The screw shaft (7056) is rotatably connected with the scraper main body (701), and the knocking block (7057) is fixedly installed on the screw shaft (7056).

4. An automatic refill device according to claim 3, wherein: ​ 5. An automatic refill device according to claim 4, characterized in that: The lower end of the powder box (9) is provided with a cleaning mechanism (14) for cleaning the hot melt powder adhered to the powder roller (12); The cleaning mechanism (14) comprises: A roller brush (141) closely attached to the powder roller (12); Two groups of L-shaped supports (142) for supporting both ends of the roller brush (141); A plurality of groups of poking bars (143) equidistantly arranged on one side of the roller brush (141), the poking bars (143) being used for shaking off the hot melt powder adhered to the roller brush (141); And A fixing block (144) fixedly connected with the poking bars (143).

6. An automatic refill device according to claim 5, wherein: The two groups of L-shaped supports (142) are symmetrically installed on both sides of the lower end of the powder box (9), and the fixing block (144) is fixedly installed on the powder box (9).

7. An automatic refill device according to claim 6, characterized in that: The roller brush (141) comprises: A brush body (1411) closely attached to the powder roller (12); A rectangular hole (1412) opened on the brush body (1411); A rectangular shaft (1413) movably inserted into the rectangular hole (1412); And A guide rod (1414) fixedly installed on the end of the brush body (1411).

8. An automatic refill device according to claim 7, characterized in that: Both ends of the brush body (1411) are rotatably connected with the two groups of L-shaped supports (142), an inclined annular groove (1421) is opened on one of the L-shaped supports (142), and one end of the guide rod (1414) extends into the inclined annular groove (1421).

9. An automatic refill device according to claim 8, characterized in that: The end of the poking bar (143) extends into the fiber wire on the brush body (1411), and the guide rod (1414) is driven along the inclined annular groove (1421) to move the brush body (1411) back and forth in the axial direction.

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