Drying device for UPR resin

Abstract

The invention provides a drying device for UPR resin, and belongs to the technical field of resin processing, the drying device comprises a rack and a drying bin horizontally arranged above the rack, the drying bin is composed of a feeding disc, a discharging disc and a roller, and a driving part used for driving the roller to rotate is arranged on the rack; an air heater is arranged on the feeding disc, an air supply pipe communicated with an air outlet of the air heater is arranged between the feeding disc and the discharging disc and penetrates through an inner cavity of the roller, a plurality of exhaust holes communicated with an inner cavity of the air supply pipe are formed in the air supply pipe in an array mode, and a backflow pipe communicated with an air inlet of the air heater is arranged between the feeding disc and the discharging disc. The return pipe is positioned right above the air supply pipe; a plurality of material raising plates are arranged on the inner wall surface of the roller in an array manner, and the material raising plates are spirally arranged and used for raising and pushing UPR resin in the rotating process of the roller; according to the invention, the possibility of insufficient heating or low heat energy utilization rate of the UPR resin can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of resin processing, and in particular to a drying device for UPR resin. Background Art

[0002] UPR resin (unsaturated polyester resin) is an important thermosetting resin. It is widely used in FRP products such as boats, pipes, storage tanks, etc., as well as in the fields of construction and automobiles. UPR resin has good formability, mechanical properties and corrosion resistance. Different types of UPR resins can meet different application requirements by changing their chemical composition.

[0003] In the production process of UPR resin, the drying process of resin is a key link that affects product quality and production efficiency. At present, the drying of UPR resin is usually completed with the help of a drum drying device. In the process of passing hot air into the drum to contact with the UPR resin, the rotation of the drum can make the UPR resin continue to move under the action of centrifugal force and gravity, which is conducive to the uniform contact between the UPR resin and the hot air, so as to achieve the evaporation of the water inside the UPR resin.

[0004] Referring to the Chinese patent document with announcement number CN215724791U and announcement date February 1, 2022, titled "A drying device for synthetic resin manufacturing", hot air is introduced into the drum through a hot air blower so that the hot air takes away the moisture mixed in the synthetic resin, and the synthetic resin can be stirred by a mixing mechanism during the drying process, thereby further improving the heat exchange contact efficiency between the hot air and the synthetic resin, so as to improve the final drying effect.

[0005] Referring to the above technical solution, when the UPR resin is dried by a drum drying device, hot air usually enters from one side of the drum and is discharged from the other side, so that the hot air can entrain and discharge the moisture in the UPR resin. However, during the flow of hot air, when the linear flow path of the hot air inside the drum is long, its heat will continue to be lost as the drying work proceeds, and the UPR resin near the drum outlet may not be heated sufficiently; on the contrary, when the linear flow path of the hot air inside the drum is short, the hot air with a high temperature is easily discharged quickly to the outside of the drum, which leads to low thermal energy utilization. Summary of the invention

[0006] In view of this, the present application provides a drying device for UPR resin, which is mainly used to solve the problem that UPR resin is easily insufficiently heated and has low thermal energy utilization when hot air is quickly discharged from the drum.

[0007] In order to solve the above technical problems, the present application provides a drying device for UPR resin, including a frame and a drying bin horizontally arranged above the frame, and the drying bin is composed of a feed tray, a discharge tray and a drum, and a driving member for driving the drum to rotate is arranged on the frame; a hot air blower is arranged on the feed tray, and an air supply pipe connected to the air outlet of the hot air blower is arranged between the feed tray and the discharge tray and passes through the inner cavity of the drum, and a plurality of exhaust holes connected to the inner cavity of the air supply pipe are arranged in an array, and a return pipe connected to the air inlet of the hot air blower is arranged between the feed tray and the discharge tray, and the return pipe is located directly above the air supply pipe; a plurality of lifting plates are arranged in an array on the inner wall of the drum, and the lifting plates are all arranged in a spiral shape, which are used to lift and push the UPR resin during the rotation of the drum.

[0008] By adopting the above technical scheme, when drying the UPR resin, the UPR resin is continuously lifted up by a lifting plate that rotates with the drum and pushed toward the position of the discharge tray. At the same time, the hot air generated by the hot air blower can evenly enter the inner cavity of the drum at the axial position of the drum through the exhaust holes evenly arranged on the air supply pipe, so that the hot air introduction amount at each axial position of the drum is kept as consistent as possible, thereby improving the drying effect of the UPR resin. At the same time, with the cooperation of the reflux pipe, the hot air after contacting the UPR resin can reflux and enter the drum again after completing the cycle heating. Compared with the method of directly discharging the hot air, the thermal energy utilization rate of the hot air can be improved to a certain extent.

[0009] Optionally, the air supply pipe is provided with a plurality of hollow rings in an array sleeve on the outside, and the plurality of hollow rings are fixedly connected in series via a cross bar, and a plurality of stirring frames are rotatably connected to each hollow ring, and a transmission member is provided between the discharge tray and the drum for driving the whole composed of the plurality of hollow rings and the stirring frames to rotate circumferentially around the air supply pipe. The air supply pipe can cause the stirring frame to rotate on its own through bevel gear transmission when the stirring frame rotates circumferentially around the air supply pipe.

[0010] By adopting the above technical solution, the stirring rack can stir the UPR resin during the drying process of the UPR resin, so that the UPR resin and the hot air can be in contact and heat exchange more evenly.

[0011] Optionally, the stirring racks are all hollow, and the inner cavities of the stirring rack and the air supply pipe are connected through a hollow ring and an exhaust hole, and a plurality of diversion holes connected to the inner cavities of the stirring racks are evenly formed on the blades of the stirring racks.

[0012] By adopting the above technical solution, the hot air introduced into the air supply pipe can be more evenly filled into the drum with the help of the diversion holes, thereby further improving the final drying quality.

[0013] Optionally, the transmission component includes a reversing gear arranged inside the discharge tray through a supporting truss, a large diameter gear ring meshing with the reversing gear is arranged at the edge of the drum, and a transmission gear coaxial with itself and capable of meshing with the reversing gear is arranged on the whole composed of multiple hollow rings.

[0014] By adopting the above technical solution, under the step-by-step transmission of the large-diameter gear ring, the reversing gear and the transmission gear, the whole composed of multiple hollow rings can rotate with the rotation of the drum.

[0015] Optionally, a partition plate fixedly connected to the support truss is rotatably connected in an opening on one side of the drum close to the discharge tray, and a guide port for UPR resin to enter the discharge tray is opened at the lower end of the partition plate.

[0016] By adopting the above technical solution, with the participation of the partition board, the lifted UPR resin can only be discharged from the drum through the material guide port after being blocked by the partition board, so as to prevent the transmission parts from being interfered by the UPR resin and unable to work normally.

[0017] Optionally, the cross-section of the lifting plate is L-shaped, and the L-shaped corner of the lifting plate is located on a side close to the central axis of the drum.

[0018] By adopting the above technical solution, due to the presence of the L-shaped corner on the lifting plate, part of the UPR resin can be lifted to a higher point by the lifting plate, so that the UPR resin can be better dispersed, which is conducive to the comprehensive contact between the hot air and the UPR resin.

[0019] Optionally, the lifting plates are rotatably connected to the inner wall of the drum via a transition base, a humidity sensor for detecting the humidity inside the drying bin is provided on the return pipe, and an adjusting member for driving the lifting plates to rotate is provided on the drum.

[0020] By adopting the above technical solution, the humidity sensor can detect the internal humidity of the drying bin in real time, and then through the cooperation of the adjustment parts, the angle of the lifting plate can be adjusted, thereby changing the unit pushing distance of the lifting plate for the UPR resin, and then adjusting the time taken for the UPR resin to pass through the drying bin.

[0021] Optionally, the adjusting member includes a servo motor arranged on the drum, a driving gear is arranged on the output shaft of the servo motor, a double-sided gear ring meshing with the driving gear is arranged on the drum, a rotating rod is arranged through a plurality of laterally corresponding transition bases in a rotating connection, and a driven gear meshing with the double-sided gear ring is arranged on the rotating rod, and the rotating rod can drive the lifting plate to rotate by means of a bevel gear transmission.

[0022] By adopting the above technical solution, when the servo motor drives the driving gear to rotate, the double-sided gear ring meshing with the driving gear will rotate accordingly, and then the double-sided gear ring will drive the driven gear and the rotating rod to rotate together, and finally the rotating rod can make all the lifting plates rotate synchronously through the bevel gear transmission, so as to realize the angle adjustment of the lifting plates.

[0023] Optionally, the driving member includes a reduction motor arranged on the frame, and the reduction motor can drive the drum to rotate by chain transmission.

[0024] Optionally, the frame is provided with supporting wheels in groups of two symmetrically on the left and right, and the roller is provided with two guide rings matching the supporting wheels.

[0025] By adopting the above technical solution, the support wheel and the guide ring cooperate to provide further guiding support for the drum during its rotation, thereby improving the stability of the drum during rotation.

[0026] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects: 1. When hot air is introduced into the drum, the direction of air inlet and outlet is optimized so that the hot air enters radially on the axis of the drum, and then the hot air can be circulated and heated and put into drying again. Compared with the conventional axial air inlet and outlet method, the probability of insufficient heating of UPR resin can be reduced, and the thermal energy utilization rate of hot air can be improved to a certain extent.

[0027] 2. During the drying process of the UPR resin, the UPR resin can be continuously stirred and the hot air can be continuously turbulent, so that the UPR resin and the hot air can contact more evenly, so as to improve the drying efficiency of the UPR resin. In addition, part of the hot air will be discharged into the drum by the hollow and rotating stirring blades, so that the hot air is evenly filled in the drum, further improving the final drying quality.

[0028] 3. In addition, after the UPR resin enters the drum, the unit pushing distance is adjusted to adjust the time it takes for the UPR resin to pass through the drum according to the humidity conditions inside the drum, thereby reducing the possibility of the UPR resin being discharged from the drum without being effectively dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a drying device for UPR resin in this application; Figure 2 This is a cross-sectional view of the discharge tray and the drum of this application; Figure 3 This is a cross-sectional view of the feed tray, discharge tray and roller of this application; Figure 4 For this application Figure 3 A partial enlarged view of the middle area A; Figure 5 For this application Figure 3 A partial enlarged view of the middle area B; Figure 6 This is a schematic diagram of the structure of the transmission parts of this application; Figure 7 This is a schematic diagram of the structure of the reflux pipe of this application.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. Frame; 11. Support wheel; 12. Guide ring; 2. Drying chamber; 21. Feed tray; 22. Discharge tray; 23. Roller; 231. Lifting plate; 232. Transition base; 3. Driving member; 31. Reducer motor; 4. Hot air blower; 41. Air supply pipe; 42. Exhaust hole; 43. Return pipe; 5. Hollow ring; 51. Stirring frame; 52. Transmission member; 521. Support truss; 522. Reversing gear; 523. Large diameter gear ring; 524. Transmission gear; 53. Diverter hole; 6. Partition plate; 61. Material guide port; 7. Humidity sensor; 8. Adjusting member; 81. Servo motor; 82. Driving gear; 83. Double-sided gear ring; 84. Turning rod; 85. Driven gear. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 7 , the technical solutions of the embodiments of the present application are clearly and completely described. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0032] Reference Figure 1 and Figure 2 This embodiment provides a drying device for UPR resin, including a frame 1, a drying chamber 2, a drying mechanism and a lifting mechanism. The drying chamber 2 is composed of a feed tray 21, a discharge tray 22 and a roller 23. The feed tray 21 and the discharge tray 22 are both fixedly connected to the frame 1. The roller 23 is rotatably connected between the feed tray 21 and the discharge tray 22. The frame 1 is provided with a driving member 3 for driving the roller 23 to rotate; the driving member 3 includes a reduction motor 31 provided on the frame 1, and the reduction motor 31 can drive the roller 23 to rotate by chain transmission.

[0033] Among them, refer to Figure 1 , Figure 2 , Figure 3 and Figure 7The drying mechanism includes a hot air blower 4, an air supply pipe 41, an exhaust hole 42 and a return pipe 43. The hot air blower 4 is arranged on the feed tray 21, the air supply pipe 41 is arranged between the feed tray 21 and the discharge tray 22 and is connected to the air outlet of the hot air blower 4, and the air supply pipe 41 can penetrate the inner cavity of the drum 23, the exhaust holes 42 are arranged in an array on the air supply pipe 41 and are connected to the inner cavity of the air supply pipe 41, the return pipe 43 is arranged between the feed tray 21 and the discharge tray 22 and is connected to the air inlet of the hot air blower 4, the return pipe 43 is arranged with exhaust holes in an array connected to the inner cavity of the drum 23, and the return pipe 43 is located directly above the air supply pipe 41.

[0034] When drying the UPR resin, the hot air blower 4 is running to pass the hot air into the air supply pipe 41, and then the hot air can be discharged evenly into the inside of the drum 23 along the radial direction at the axial position of the drum 23 through the exhaust holes 42, thereby reducing the possibility of insufficient heating of the UPR resin inside the drum 23. As the hot air blower 4 continues to operate, a certain negative pressure suction force will be generated inside the return pipe 43, and the hot air inside the drum 23 will be sucked in through the exhaust holes for circulation, thereby improving the utilization rate of the hot air to a certain extent.

[0035] Among them, refer to Figure 2 and Figure 3 The material lifting mechanism includes a material lifting plate 231. A plurality of material lifting plates 231 are arranged in an array distribution manner on the inner wall surface of the drum 23. The material lifting plates 231 are all arranged in a spiral shape, and are used to lift and push the UPR resin during the rotation of the drum 23. The cross-section of the material lifting plates 231 is arranged in an L-shape, and the L-shaped corner of the material lifting plate 231 is located on the side close to the central axis of the drum 23.

[0036] When the drum 23 rotates, the lifting plate 231 that moves circumferentially with the drum 23 can push the UPR resin to the left, and under the action of gravity, the lifting plate 231 can continuously lift and sprinkle the UPR resin, so that the UPR resin and the hot air are in contact more evenly, thereby improving the drying efficiency of the UPR resin; since the cross-section of the lifting plate 231 is L-shaped, when the lifting plate 231 lifts the UPR resin, part of the UPR resin can be lifted to a higher point under the support limit of the L-shaped corner of the lifting plate 231, so that the UPR resin is better dispersed, which is beneficial to the comprehensive contact between the hot air and the UPR resin, thereby accelerating the evaporation of water and improving the drying effect.

[0037] In addition, refer to Figure 2 , Figure 3 and Figure 5The lifting plates 231 are rotatably connected to the inner wall of the drum 23 through the transition base 232. The return pipe 43 is provided with a humidity sensor 7 for detecting the humidity inside the drying chamber 2. The drum 23 is provided with an adjusting member 8 for driving the lifting plate 231 to rotate; the adjusting member 8 includes a servo motor 81, a driving gear 82, a double-sided gear ring 83, a rotating rod 84 and a driven gear 85. The servo motor 81 is arranged on the drum 23, the driving gear 82 is arranged on the output shaft of the servo motor 81, the double-sided gear ring 83 is arranged on the drum 23 and meshed with the driving gear 82, a plurality of rotating rods 84 are provided and are rotatably connected and penetrate between the corresponding transition bases 232 in the horizontal direction, the driven gear 85 is arranged on the rotating rod 84 and meshed with the double-sided gear ring 83, and the rotating rod 84 can drive the lifting plate 231 to rotate by means of bevel gear transmission.

[0038] During the drying process of the UPR resin, the humidity sensor 7 can detect the internal humidity of the drying chamber 2 in real time. When the internal humidity of the drying chamber 2 is too high, the servo motor 81 drives the driving gear 82 to rotate. Through the step-by-step transmission of the double-sided gear ring 83 and the driven gear 85, the rotating rod 84 will rotate accordingly, and then the rotating rod 84 will cause the lifting plate 231 to rotate moderately through the bevel gear transmission, thereby reducing the pushing distance of the lifting plate 231 on the UPR resin when the drum 23 rotates one circle, extending the time for the UPR resin to pass through the drying chamber 2, so that the UPR resin can be effectively dried.

[0039] Reference Figure 2 , Figure 3 , Figure 4 and Figure 6 A stirring mechanism is arranged inside the drum 23 , and the stirring mechanism includes a hollow ring 5 , a stirring frame 51 and a transmission member 52 . A plurality of hollow rings 5 ​​are provided and are rotatably mounted on the outside of the air supply pipe 41, and the plurality of hollow rings 5 ​​are fixedly connected in series by a cross bar, and a plurality of stirring frames 51 are rotatably connected to each hollow ring 5; the transmission member 52 includes a supporting truss 521, a reversing gear 522, a large diameter gear ring 523 and a transmission gear 524, the reversing gear 522 is arranged inside the discharge tray 22 through the supporting truss 521, the large diameter gear ring 523 is arranged at the edge of the drum 23 and meshes with the reversing gear 522, the transmission gear 524 is arranged on the whole composed of the plurality of hollow rings 5, the transmission gear 524 is coaxially arranged with the hollow rings 5 ​​and can mesh with the reversing gear 522, and is used to drive the whole composed of the plurality of hollow rings 5 ​​and the stirring frames 51 to rotate circumferentially around the air supply pipe 41, and the air supply pipe 41 can cause the stirring frame 51 to rotate by itself through bevel gear transmission when the stirring frame 51 rotates circumferentially around the air supply pipe 41.

[0040] During the rotation of the drum 23, through the step-by-step transmission of the large-diameter gear ring 523, the reversing gear 522 and the transmission gear 524, the hollow ring 5 will rotate around the air supply pipe 41 in the opposite direction of rotation to the drum 23, so that the stirring frame 51 stirs the UPR resin circumferentially. At the same time, the air supply pipe 41 can cause the stirring frame 51 to rotate by itself through the bevel gear transmission, so as to further stir the UPR resin and make the UPR resin contact with the hot air more evenly.

[0041] Among them, refer to Figure 2 , Figure 3 and Figure 4 The stirring racks 51 are all hollow, and the inner cavities of the stirring racks 51 and the air supply pipe 41 are connected through the hollow ring 5 and the exhaust hole 42. The blades of the stirring racks 51 are evenly provided with a plurality of diversion holes 53 connected with their own inner cavities.

[0042] When hot air enters the air supply pipe 41, part of the hot air will pass through the exhaust hole 42, the hollow ring 5 and the stirring frame 51 in sequence and be discharged into the drum 23 through the diversion hole 53, so that the hot air can be more evenly filled in the drum 23, thereby improving the drying effect of the UPR resin.

[0043] In addition, refer to Figure 2 , Figure 3 and Figure 6 A partition plate 6 fixedly connected to the support truss 521 is rotatably connected in the opening on the drum 23 near the discharge tray 22, and a guide port 61 for UPR resin to enter the discharge tray 22 is opened at the lower end of the partition plate 6.

[0044] During the drying process of the UPR resin, due to the existence of the partition plate 6 , the lifted UPR resin can only be discharged from the drum 23 through the guide port 61 and enter the bottom of the discharge tray 22 , so as to prevent the UPR resin from interfering with the transmission member 52 .

[0045] Reference Figure 1 and Figure 2 The frame 1 is symmetrically provided with two supporting wheels 11 in a group, and the roller 23 is provided with two guide rings 12 matching with the supporting wheels 11.

[0046] During the rotation of the drum 23 , the support wheel 11 cooperates with the guide ring 12 to provide a certain guiding support for the drum 23 , thereby improving the stability of the drum 23 during rotation.

[0047] The implementation principle of a drying device for UPR resin in the embodiment of the present application is: When drying the UPR resin, the personnel first feed the UPR resin from the feed tray 21 into the drum 23, and then the reduction motor 31 drives the drum 23 to rotate by chain transmission. At the same time, the hot air blower 4 runs to pass the hot air into the air supply pipe 41, and then the hot air can be evenly discharged to the inside of the drum 23 along the radial direction at the axial position of the drum 23 through the exhaust hole 42, so that the hot air contacts the UPR resin and completes the drying of the UPR resin. With the continuous operation of the hot air blower 4, a certain negative pressure suction will be generated inside the return pipe 43, and the hot air inside the drum 23 will be sucked in through the exhaust hole for circulation, which improves the utilization rate of the hot air to a certain extent.

[0048] While the drum 23 is rotating, the lifting plate 231 that moves circumferentially with the drum 23 can push the UPR resin to the left, and under the action of gravity, the lifting plate 231 can continuously lift and drop the UPR resin, so that the UPR resin is in contact with the hot air more evenly, thereby improving the drying efficiency of the UPR resin.

[0049] At the same time, through the step-by-step transmission of the large-diameter gear ring 523, the reversing gear 522 and the transmission gear 524, the hollow ring 5 will rotate around the air supply pipe 41 in the opposite direction of rotation to the drum 23, so that the stirring frame 51 stirs the UPR resin circumferentially. At the same time, the air supply pipe 41 can cause the stirring frame 51 to rotate by itself through the bevel gear transmission, so as to further stir the UPR resin and make the UPR resin contact with the hot air more evenly.

[0050] When hot air enters the air supply pipe 41, part of the hot air will pass through the exhaust hole 42, the hollow ring 5 and the stirring frame 51 in sequence and be discharged into the inside of the drum 23 through the diversion hole 53, so that the hot air can be more evenly filled in the inside of the drum 23, so that the UPR resin in the drum 23 can have a more comprehensive heat exchange contact with the hot air, thereby improving the drying effect of the UPR resin.

[0051] In addition, during the drying process of the UPR resin, the humidity sensor 7 can detect the internal humidity of the drying chamber 2 in real time. When the humidity inside the drying chamber 2 is too high, the servo motor 81 drives the driving gear 82 to rotate. Through the step-by-step transmission of the double-sided gear ring 83 and the driven gear 85, the rotating rod 84 will rotate accordingly, and then the rotating rod 84 causes the lifting plate 231 to rotate moderately through the bevel gear transmission, thereby reducing the pushing distance of the lifting plate 231 on the UPR resin when the drum 23 rotates one circle, extending the time for the UPR resin to pass through the drying chamber 2, so that the UPR resin can be effectively dried.

[0052] After the drying of the UPR resin is completed, the UPR resin inside the drum 23 will enter the inner bottom of the discharge tray 22 through the guide port 61 under the continuous pushing of the lifting plate 231, and then the UPR resin will be discharged from the discharge port at the bottom of the discharge tray 22 to complete the discharge.

[0053] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A drying device for UPR resin, comprising a frame (1) and a drying chamber (2) arranged horizontally above the frame, wherein the drying chamber (2) is composed of a feed tray (21), a discharge tray (22) and a roller (23), and a driving member (3) is arranged on the frame (1) for driving the roller (23) to rotate, characterized in that: The feed tray (21) is provided with a hot air blower (4); an air supply pipe (41) connected to the air outlet of the hot air blower (4) is provided between the feed tray (21) and the discharge tray (22) and passes through the inner cavity of the drum (23); a plurality of exhaust holes (42) connected to the inner cavity of the drum (23) are arranged in an array on the air supply pipe (41); a return pipe (43) connected to the air inlet of the hot air blower (4) is provided between the feed tray (21) and the discharge tray (22); and the return pipe (43) is located directly above the air supply pipe (41); The inner wall surface of the drum (23) is provided with a plurality of lifting plates (231) in an array, and the lifting plates (231) are all arranged in a spiral shape and are used to lift and push the UPR resin during the rotation of the drum (23).

2. A drying device for UPR resin according to claim 1, characterized in that: The air supply pipe (41) is provided with a plurality of hollow rings (5) in an array array outside thereof, and the plurality of hollow rings (5) are fixedly connected in series via a cross bar, and each hollow ring (5) is rotatably connected to a plurality of stirring racks (51), and a transmission member (52) is provided between the discharge tray (22) and the roller (23) for driving the whole composed of the plurality of hollow rings (5) and the stirring racks (51) to rotate circumferentially around the air supply pipe (41), and the air supply pipe (41) can cause the stirring rack (51) to rotate by itself through a bevel gear transmission when the stirring rack (51) rotates circumferentially around the air supply pipe (41).

3. A drying device for UPR resin according to claim 2, characterized in that: The stirring racks (51) are all hollow, and the inner cavities of the stirring racks (51) and the air supply pipe (41) are connected via the hollow ring (5) and the exhaust hole (42). The blades of the stirring racks (51) are evenly provided with a plurality of diversion holes (53) connected to the inner cavities thereof.

4. A drying device for UPR resin according to claim 2, characterized in that: The transmission member (52) comprises a reversing gear (522) arranged inside the discharge tray (22) via a supporting truss (521); a large-diameter toothed ring (523) meshing with the reversing gear (522) is arranged at the edge of the roller (23); and a transmission gear (524) coaxial with the ring and capable of meshing with the reversing gear (522) is arranged on the whole composed of the plurality of hollow rings (5).

5. A drying device for UPR resin according to claim 4, characterized in that: A partition plate (6) fixedly connected to the support truss (521) is rotatably connected in an opening on one side of the roller (23) close to the discharge tray (22), and a guide port (61) for UPR resin to enter the discharge tray (22) is provided at the lower end of the partition plate (6).

6. A drying device for UPR resin according to claim 1, characterized in that: The cross-section of the lifting plate (231) is L-shaped, and the L-shaped corner of the lifting plate (231) is located on a side close to the central axis of the drum (23).

7. A drying device for UPR resin according to claim 1, characterized in that: The lifting plates (231) are rotatably connected to the inner wall surface of the drum (23) via a transition base (232); a humidity sensor (7) for detecting the internal humidity of the drying chamber (2) is provided on the return pipe (43); and an adjusting member (8) for driving the lifting plates (231) to rotate is provided on the drum (23).

8. A drying device for UPR resin according to claim 7, characterized in that: The adjusting member (8) comprises a servo motor (81) arranged on the roller (23), a driving gear (82) being arranged on the output shaft of the servo motor (81), a double-sided gear ring (83) meshing with the driving gear (82) being arranged on the roller (23), a rotating rod (84) being arranged through a plurality of laterally corresponding transition bases (232) in a rotatable manner, and a driven gear (85) meshing with the double-sided gear ring (83) being arranged on the rotating rods (84), and the rotating rods (84) are all provided with driven gears (85) meshing with the double-sided gear ring (83), and the rotating rods (84) can drive the lifting plate (231) to rotate by means of a bevel gear transmission.

9. A drying device for UPR resin according to claim 1, characterized in that: The driving member (3) comprises a reduction motor (31) arranged on the frame (1), and the reduction motor (31) can drive the roller (23) to rotate by chain transmission.

10. A drying device for UPR resin according to claim 1, characterized in that: The frame (1) is symmetrically provided with two supporting wheels (11) in groups of two, and the roller (23) is provided with two guide rings (12) matching the supporting wheels (11).

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