Master batch drying system

Abstract

The invention discloses a master batch drying system and relates to the field of master batch drying, the master batch drying system comprises a drying box and a motor, the motor is fixed to the side edge of the drying box, an elliptical wheel is fixed to the output end of the motor, the elliptical wheel is arranged in the drying box, and a material shaking mechanism is installed in the drying box; the material shaking mechanism comprises material shaking plates, discharging openings, cylinders, vertical rods, circular plates, springs and fixing rods, the two material shaking plates are arranged in the drying box, the discharging openings are formed in the two material shaking plates at equal angles, a feeding opening and a discharging opening of the material shaking plate on the upper side and a feeding opening and a discharging opening of the material shaking plate on the lower side are distributed in a staggered mode, and material cleaning mechanisms are arranged in the discharging openings. And a material distributing mechanism is mounted on the material shaking plate. According to the master batch drying system, the vibration type material shaking mechanism is adopted, the material shaking and scattering effect can be achieved, material adhesion is avoided, the retention time of the materials in the drying box can be prolonged, and therefore the drying time is prolonged, and the drying effect of the materials is improved.

Description

Technical Field

[0001] The invention relates to the technical field of masterbatch drying, in particular to a masterbatch drying system. Background Art

[0002] Masterbatch is a kind of masterbatch, which is a plastic colorant made of a high proportion of pigments or additives and thermoplastic resins, and is well dispersed. During the production of traditional masterbatches, since the raw materials contain a certain amount of moisture, when the moisture content is high, the masterbatch is easy to stick together, which is not conducive to transportation and storage, and is easy to affect the use effect and service life of the masterbatch, so the masterbatch needs to be dried by a drying device; The existing masterbatch drying device, such as a masterbatch dryer with publication number CN203888066U, comprises a drying tube and an air supply pump, the drying tube comprises a feed port and a discharge port, a hopper for placing masterbatch is arranged at the feed port, the drying tube comprises an inner wall and an outer wall, a cavity is arranged between the inner wall and the outer wall, a plurality of air outlets are arranged on the inner wall and the air outlets are arranged in a direction from the feed port to the discharge port, the air outlets are interconnected with the cavity, and an air supply tube is arranged between the air supply pump and the cavity; Although the above patent can dehydrate and dry the masterbatch, the masterbatch only achieves drying by automatically falling due to gravity. Since the moisture content of the masterbatch is high when it enters at the beginning, some of the masterbatch will stick together and cannot be dispersed, thereby affecting the drying effect of the masterbatch. Even if the sticky masterbatch can be completely dried, multiple masterbatch will be stuck and fixed after drying and cannot be separated, thereby affecting the production quality of the masterbatch. Therefore, in view of the above problems, a masterbatch drying system is now designed to better meet the actual use needs. Summary of the invention

[0003] The object of the present invention is to provide a masterbatch drying system to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a masterbatch drying system, comprising a drying box and a motor, a motor is fixed to the side of the drying box, an elliptical wheel is fixed to the output end of the motor, the elliptical wheel is arranged in the drying box, a material shaking mechanism is installed in the drying box, the material shaking mechanism comprises a material shaking plate, a material discharge port, a cylinder, a vertical rod, a circular plate, a spring and a fixed rod, two material shaking plates are arranged in the drying box, and the two material shaking plates are provided with material discharge ports at equal angles, and the upper and lower material ports of the upper and lower material shaking plates are staggered, a material clearing mechanism is arranged in the material discharge port, a material dividing mechanism is installed on the material shaking plate, a cylinder is fixed at equal angles on the material shaking plate, the material shaking plate and the vertical rod fixed in the drying box are slidably connected, a circular plate is fixed on the vertical rod, the circular plate is slidably connected in the cylinder, a spring is fixed between the circular plate and the material shaking plate, a fixed rod is fixed on the material shaking plate, and the fixed rod and the elliptical wheel are slidably connected.

[0005] Preferably, a feed pipe is provided at the upper end of the drying box, and the feed pipe is connected to the hopper, an exhaust hole is installed at the upper end of the drying box, and a discharge port is installed at the lower end of the drying box, and an air supply mechanism is fixed in the drying box. Through the above structure, the material can be put in and out, and the gas can be discharged conveniently through the exhaust hole, providing a basic guarantee for the normal operation of the device.

[0006] Preferably, the material clearing mechanism includes a circular ring, a connecting rod, a fixed frame, a guide rod and a movable block. The circular ring is fixed on the vertical rod, and there is a one-to-one correspondence between the circular ring and the shaking plate. The circular ring is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the fixed frame. There is a one-to-one correspondence between the fixed frame and the discharge port. When the shaking plate is moved under force, the transmission action of the connecting rod can provide a basic force for the movement of the fixed frame.

[0007] Preferably, the fixing frame and the guide rod are slidably connected, and the guide rod is fixed on the shaking plate. When the fixing frame moves, the sliding guiding effect between the fixing frame and the guide rod can ensure the stability of the movement of the fixing frame.

[0008] Preferably, a movable block is fixed on the fixed frame, and the movable block is slidably connected to the discharge port, and the width of both ends of the movable block gradually decreases. When the fixed frame moves, the movable block is driven to move synchronously. Through the action of the movable block, the discharge port can be cleaned to prevent the discharge port from being blocked by materials and affecting the normal operation of the device.

[0009] Preferably, the material distribution mechanism includes a rotating shaft, a baffle, a loosening rod, a material distribution plate, a striking plate, a round rod, a spiral groove and a sliding rod. The rotating shaft is connected to the upper material shaking plate through a bearing, and the rotating shaft and the lower material shaking plate are slidably connected, and the baffle is fixed on the rotating shaft. At the same time, the baffle cooperates with the feed pipe to achieve a sealing effect. When the upper material shaking plate moves, it can provide a basic force for the movement of the rotating shaft. Through the movement of the rotating shaft, the baffle can be driven to move synchronously, thereby realizing the opening and closing of the feed pipe, and then intermittent feeding can be achieved, thereby ensuring the drying effect of the material.

[0010] Preferably, a loosening rod is fixed on the baffle, and the loosening rod is arranged in the hopper. The material can be loosened by the rotation of the loosening rod, thereby avoiding the material from sticking and affecting the normal feeding function, thereby ensuring the normal operation of the device.

[0011] Preferably, a material distribution disc is fixed on the rotating shaft, and strip holes are evenly opened on the material distribution disc. A striking plate is also fixed on the rotating shaft. When the material falls onto the material distribution disc, the material can be dispersed by the rotating centrifugal action of the material distribution disc, and when the material splashes under the action of the shaking plate, the material can be struck by the striking plate, thereby effectively avoiding material adhesion and ensuring the drying effect of the material.

[0012] Preferably, a round rod is fixed to the lower end of the rotating shaft, and a spiral groove is opened on the round rod, and the spiral groove and the slide rod are slidably connected. At the same time, the slide rod is fixed to the lower shaking material plate. When the lower shaking material plate moves downward, the slide rod is synchronously driven to move. Combined with the sliding action between the slide rod and the spiral groove, a basic force can be provided for the rotation of the round rod, the striking plate and the loosening rod to ensure the normal operation of the device.

[0013] Preferably, the air supply mechanism includes an air inlet duct, an air guide ring and a nozzle. The air inlet duct and the air guide ring are interconnected, and the air guide ring is fixed in the drying box at equal intervals, and nozzles are fixed at equal angles on the inner side of the air guide ring. Through the above structure, dry hot air can be delivered into the drying box, thereby providing a basic guarantee for achieving drying of the material.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The masterbatch drying system adopts a vibrating material shaking mechanism, which can not only shake the material to avoid material adhesion, but also increase the retention time of the material in the drying box, thereby increasing the drying time and improving the drying effect of the material. Specifically, the motor drives the elliptical wheel to rotate, and the sliding action between the elliptical wheel and the fixed rod and the elastic action of the spring can make the shaking plate move up and down in an orderly manner. The shaking plate can achieve the material shaking effect through the up and down movement of the shaking plate. In the process of material shaking, part of the material falls through the discharge port, and part of the material continues to fall onto the shaking plate for the next shaking, thereby ensuring the drying effect of the material. When the shaking plate moves, the cylinder can be used to achieve spring protection to avoid the material sticking to the spring and affecting the normal operation of the device. 2. The masterbatch drying system adopts a linked material distribution mechanism, which can not only realize intermittent material discharge to avoid excessive material discharge at one time and affect the drying effect, but also loosen the material to avoid material adhesion and affect the normal material discharge. It can also hit the material splashed by the shaking of the shaking plate to further disperse the material and avoid material adhesion. Specifically, when the upper shaking plate moves up and down, it can drive the rotating shaft and the baffle to move, so as to realize the opening and closing of the feed pipe, and then realize intermittent material discharge. When the lower shaking plate moves up and down, with the action of the sliding rod, spiral groove and round rod, the rotating shaft, the distribution plate and the striking plate can be rotated. Through the centrifugal action of the distribution plate, the material is evenly dispersed to the surroundings. With the action of the striking plate, the splashing material can be beaten and scattered. 3. The masterbatch drying system adopts a linkage cleaning mechanism, which can effectively prevent the material from blocking the discharge port and affecting the normal operation of the device. Specifically, when the shaking plate moves up and down, the transmission action of the connecting rod is coordinated to make the fixed frame and the movable block move, and the sliding action between the movable block and the discharge port can push and clean the material blocked in the discharge port to ensure the normal operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front view cross-section of the overall composition of the device of the present invention; Figure 2 It is a schematic diagram of the front view cross-section of the three-dimensional structure of the material shaking mechanism of the present invention; Figure 3 It is a schematic diagram of the front view of the three-dimensional structure of the material shaking mechanism and the material dividing mechanism of the present invention; Figure 4 It is a bottom view structural diagram of the material shaking mechanism and the material dividing mechanism of the present invention; Figure 5 It is a bottom-up three-dimensional structural schematic diagram of the material shaking mechanism and the material clearing mechanism of the present invention; Figure 6It is a schematic diagram of the three-dimensional structure of the material cleaning mechanism of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the air supply mechanism of the present invention.

[0016] In the figure: 1. drying box; 101. feeding pipe; 102. hopper; 103. exhaust hole; 104. discharging port; 2. motor; 3. elliptical wheel; 4. shaking material mechanism; 401. shaking material plate; 402. discharging port; 403. cylinder; 404. vertical rod; 405. round plate; 406. spring; 407. fixing rod; 5. cleaning material mechanism; 501. ring; 502. connecting rod; 503. fixing frame; 504. guide rod; 505. movable block; 6. distributing material mechanism; 601. rotating shaft; 602. baffle; 603. loosening rod; 604. distributing plate; 605. striking plate; 606. round rod; 607. spiral groove; 608. sliding rod; 7. air supply mechanism; 701. air inlet pipe; 702. air guide ring; 703. nozzle. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 7 The present invention provides a technical solution: a masterbatch drying system, comprising a drying box 1 and a motor 2, the motor 2 is fixed to the side of the drying box 1, an elliptical wheel 3 is fixed to the output end of the motor 2, the elliptical wheel 3 is arranged in the drying box 1, a material shaking mechanism 4 is installed in the drying box 1, the material shaking mechanism 4 comprises a material shaking plate 401, a material discharge port 402, a cylinder 403, a vertical rod 404, a circular plate 405, a spring 406 and a fixed rod 407, two material shaking plates 401 are arranged in the drying box 1, and the material discharge ports 402 are opened at equal angles on the two material shaking plates 401, and the upper and lower material discharge ports 402 of the upper and lower material shaking plates 401 are arranged at the same angle. 02 and the upper and lower material ports 402 of the lower shaking plate 401 are staggered, a cleaning mechanism 5 is arranged in the lower material port 402, a material dividing mechanism 6 is installed on the shaking plate 401, a cylinder 403 is fixed at an equal angle on the shaking plate 401, the shaking plate 401 and the vertical rod 404 fixed in the drying box 1 are slidably connected, a circular plate 405 is fixed on the vertical rod 404, the circular plate 405 is slidably connected in the cylinder 403, a spring 406 is fixed between the circular plate 405 and the shaking plate 401, a fixing rod 407 is fixed on the shaking plate 401, and the fixing rod 407 and the elliptical wheel 3 are slidably connected.

[0019] A feed pipe 101 is provided at the upper end of the drying box 1, and the feed pipe 101 is connected to the hopper 102, an exhaust hole 103 is installed at the upper end of the drying box 1, and a discharge port 104 is installed at the lower end of the drying box 1, and an air supply mechanism 7 is fixed in the drying box 1; the material distribution mechanism 6 includes a rotating shaft 601, a baffle 602, a loosening rod 603, a material distribution plate 604, a striking plate 605, a round rod 606, a spiral groove 607 and a slide bar 608, the slide bar 608 is made of high-strength alloy steel, the rotating shaft 601 is connected to the upper shaking plate 401 through a bearing, and the rotating shaft 601 and the lower shaking plate 401 are slidably connected, and a baffle 602 is fixed on the rotating shaft 601, and the baffle 602 cooperates with the feed pipe 101 to achieve a sealing effect; the baffle A loosening rod 603 is fixed on the plate 602, and the loosening rod 603 is arranged in the hopper 102; a material distribution plate 604 is fixed on the rotating shaft 601, and strip holes are evenly opened on the material distribution plate 604, and a striking plate 605 is also fixed on the rotating shaft 601; a round rod 606 is fixed at the lower end of the rotating shaft 601, and a spiral groove 607 is opened on the round rod 606, and the spiral groove 607 is slidably connected to the sliding rod 608, and the sliding rod 608 is fixed on the lower side shaking plate 401; the air supply mechanism 7 includes an air inlet pipe 701, an air guide ring 702 and a nozzle 703, the air inlet pipe 701 and the air guide ring 702 are connected to each other, and the air guide ring 702 is fixed in the drying box 1 at equal intervals, and the nozzle 703 is fixed at equal angles on the inner side of the air guide ring 702; When using the masterbatch drying system, Figure 1-Figure 7As shown, the air inlet pipe 701 and the hot air delivery pipe are connected to each other, and the hot air enters through the air inlet pipe 701 and is dispersed into the air guide ring 702, and is sprayed out through the nozzle 703, thereby providing a basic guarantee for the drying of the masterbatch. When the masterbatch is dried, the masterbatch to be dried is placed in the hopper 102 for storage, and then the motor 2 is controlled to start, and the elliptical wheel 3 is driven by the motor 2 to rotate. During the rotation of the elliptical wheel 3, when the fixed rod 407 slides from the flat side of the elliptical wheel 3 to the convex side, the fixed rod 407 is forced to move, thereby driving the upper and lower shaking plates 401 to move in opposite directions, and the spring 406 is forced to contract. When the fixed rod 407 slides from the convex side of the elliptical wheel 3 to the flat side, the elastic action of the spring 406 causes the shaking plate 401 to move in opposite directions. The material plate 401 is reset. According to the above principle, the shaking material plate 401 can be made to move up and down in an orderly manner. When the shaking material plate 401 moves, the sliding guiding effect between the shaking material plate 401 and the vertical rod 404 can ensure the stability of the movement of the shaking material plate 401, and when the upper shaking material plate 401 moves, the rotating shaft 601, the baffle 602, the loosening rod 603, the material distribution plate 604, the striking plate 605, the round rod 606 and the spiral groove 607 can be synchronously driven to move, and the sliding effect between the rotating shaft 601 and the lower shaking material plate 401 can ensure the stability of the movement of the rotating shaft 601. When the rotating shaft 601 and the baffle 602 move upward, the baffle 602 is separated from the feeding pipe 101, and the sealing effect of the feeding pipe 101 is released. , so that the material in the hopper 102 can fall into the drying box 1, when the rotating shaft 601 and the baffle 602 move down, the baffle 602 resets to block the hopper 102, thereby realizing intermittent material discharge, avoiding excessive material discharge at one time and affecting the drying effect, and when the rotating shaft 601 and the baffle 602 move up, the round rod 606 and the spiral groove 607 move up synchronously, and at this time the slide bar 608 moves down with the lower side shaking plate 401, and the sliding action between the slide bar 608 and the spiral groove 607 makes the rotating shaft 601, the baffle 602, the loosening rod 603, the material distribution plate 604 and the striking plate 605 rotate, so that when the feeding pipe 101 is opened, the masterbatch of the hopper 102 can be discharged through the rotation of the loosening rod 603. The material entering through the feed pipe 101 first falls onto the distribution plate 604, and the strip holes on the distribution plate 604 allow a portion of the master particles to directly fall onto the upper shaking plate 401 through the strip holes on the distribution plate 604. A portion of the master particles are dispersed around under the centrifugal force of the rotation of the distribution plate 604, so that the fallen master particles can be evenly dispersed on the upper shaking plate 401. The hot air sprayed from the nozzle 703 can dry the master particles. When the master particles fall onto the upper shaking plate 401, the upper shaking plate 401 performs an orderly up and down reciprocating motion, thereby achieving the tossing and shaking effect of the master particles. When the upper shaking plate 401 tosses the master particles upward,With the action of the striking plate 605, the masterbatch can be scattered once to avoid the masterbatch sticking. The masterbatch beaten by the striking plate 605 has a certain potential energy and collides with the inner wall of the drying box 1 and then falls on the upper shaking plate 401, which can achieve the secondary collision and shaking effect of the masterbatch, thereby effectively avoiding the masterbatch sticking. When the masterbatch falls on the upper shaking plate 401, part of it falls on the lower shaking plate 401 through the unloading port 402 on the upper shaking plate 401, and part of it falls on the upper shaking plate 401 again. 01, and then the masterbatch falling on the lower shaking plate 401 is thrown and shaken again by the up and down movement of the lower shaking plate 401, which can effectively ensure the shaking effect of the masterbatch and the production quality of the masterbatch, and can also extend the retention time of the masterbatch in the drying box 1 to ensure the drying effect of the masterbatch. Finally, the dried masterbatch falls through the discharge port 402 on the lower shaking plate 401 and is discharged through the discharge port 104 for collection; The material clearing mechanism 5 includes a circular ring 501, a connecting rod 502, a fixed frame 503, a guide rod 504 and a movable block 505. The circular ring 501 is fixed on the vertical rod 404, and there is a one-to-one correspondence between the circular ring 501 and the shaking plate 401. The circular ring 501 is rotatably connected to one end of the connecting rod 502, and the other end of the connecting rod 502 is rotatably connected to the fixed frame 503. There is a one-to-one correspondence between the fixed frame 503 and the discharge port 402; there is a sliding connection between the fixed frame 503 and the guide rod 504, and the guide rod 504 is fixed on the shaking plate 401; a movable block 505 is fixed on the fixed frame 503, and there is a sliding connection between the movable block 505 and the discharge port 402, and the width of the two ends of the movable block 505 gradually decreases; During the drying process of the masterbatch, Figure 1-Figure 7 As shown, when the shaking plate 401 moves up and down, the transmission effect of the connecting rod 502 is cooperated to make the fixed frame 503 and the movable block 505 move back and forth in an orderly manner. The sliding guide effect between the fixed frame 503 and the guide rod 504 can ensure the stability of the movement of the fixed frame 503 and the movable block 505. During the movement of the movable block 505, the sliding effect between the movable block 505 and the discharge port 402 can not only squeeze out the mother particles blocked in the discharge port 402, thereby ensuring the normal operation of the device, but also The movable block 505 can reciprocate. When the falling masterbatch contacts the movable block 505, the movable block 505 can be moved to hit the masterbatch at different angles, which can make the masterbatch more evenly dispersed in the drying box 1 to ensure the drying effect. The movable block 505 can also be moved to partially block the discharge port 402, further reduce the falling speed of the masterbatch through the discharge port 402, thereby further increasing the drying time of the masterbatch and ensuring the drying effect of the masterbatch. This is the working principle of the masterbatch drying system.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A masterbatch drying system, comprising a drying box (1) and a motor (2), wherein the motor (2) is fixed to the side of the drying box (1), characterized in that: An elliptical wheel (3) is fixed to the output end of the motor (2), the elliptical wheel (3) is arranged in the drying box (1), and a material shaking mechanism (4) is installed in the drying box (1), the material shaking mechanism (4) comprises a material shaking plate (401), a material discharge port (402), a cylinder (403), a vertical rod (404), a circular plate (405), a spring (406) and a fixed rod (407), two material shaking plates (401) are arranged in the drying box (1), and the material discharge ports (402) are opened at equal angles on the two material shaking plates (401), and the upper and lower material ports (402) of the upper material shaking plate (401) and the lower and upper material ports (402) of the lower material shaking plate (401) are staggered. A material clearing mechanism (5) is provided in the material discharge port (402), a material dividing mechanism (6) is installed on the material shaking plate (401), a cylinder (403) is fixed at an equal angle on the material shaking plate (401), the material shaking plate (401) is slidably connected to a vertical rod (404) fixed in the drying box (1), a circular plate (405) is fixed on the vertical rod (404), the circular plate (405) is slidably connected in the cylinder (403), a spring (406) is fixed between the circular plate (405) and the material shaking plate (401), a fixing rod (407) is fixed on the material shaking plate (401), and the fixing rod (407) is slidably connected to the elliptical wheel (3).

2. A masterbatch drying system according to claim 1, characterized in that: A feed pipe (101) is provided at the upper end of the drying box (1), and the feed pipe (101) is connected to a hopper (102). An exhaust hole (103) is installed at the upper end of the drying box (1), and a discharge port (104) is installed at the lower end of the drying box (1). An air supply mechanism (7) is fixed inside the drying box (1).

3. A masterbatch drying system according to claim 1, characterized in that: The material clearing mechanism (5) comprises a circular ring (501), a connecting rod (502), a fixing frame (503), a guide rod (504) and a movable block (505); the circular ring (501) is fixed on the vertical rod (404), and the circular ring (501) and the material shaking plate (401) are arranged in a one-to-one correspondence; the circular ring (501) and one end of the connecting rod (502) are rotatably connected, and the other end of the connecting rod (502) is rotatably connected to the fixing frame (503); and the fixing frame (503) and the material discharge port (402) are arranged in a one-to-one correspondence.

4. A masterbatch drying system according to claim 3, characterized in that: The fixing frame (503) and the guide rod (504) are slidably connected, and the guide rod (504) is fixed on the shaking plate (401).

5. A masterbatch drying system according to claim 3, characterized in that: A movable block (505) is fixed on the fixed frame (503), and the movable block (505) is slidably connected to the feed opening (402), and the width of the two ends of the movable block (505) gradually decreases.

6. A masterbatch drying system according to claim 2, characterized in that: The material distribution mechanism (6) comprises a rotating shaft (601), a baffle (602), a loosening rod (603), a material distribution plate (604), a striking plate (605), a round rod (606), a spiral groove (607) and a sliding rod (608); the rotating shaft (601) is connected to the upper material shaking plate (401) via a bearing, and the rotating shaft (601) and the lower material shaking plate (401) are slidably connected, and the baffle (602) is fixed on the rotating shaft (601), and the baffle (602) cooperates with the feeding pipe (101) to achieve a sealing effect.

7. A masterbatch drying system according to claim 6, characterized in that: A loosening rod (603) is fixed on the baffle (602), and the loosening rod (603) is arranged in the hopper (102).

8. A masterbatch drying system according to claim 6, characterized in that: A material distribution disc (604) is fixed on the rotating shaft (601), and strip-shaped holes are evenly opened on the material distribution disc (604). A striking plate (605) is also fixed on the rotating shaft (601).

9. A masterbatch drying system according to claim 6, characterized in that: A round rod (606) is fixed to the lower end of the rotating shaft (601), and a spiral groove (607) is provided on the round rod (606). The spiral groove (607) and the sliding rod (608) are slidably connected, and the sliding rod (608) is fixed to the lower shaking plate (401).

10. A masterbatch drying system according to claim 2, characterized in that: The air supply mechanism (7) comprises an air inlet pipe (701), an air guide ring (702) and a nozzle (703); the air inlet pipe (701) and the air guide ring (702) are connected to each other, the air guide ring (702) is fixed at equal intervals in the drying box (1), and the nozzle (703) is fixed at equal angles on the inner side of the air guide ring (702).

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