Engineering plastic production drying process

Abstract

The invention relates to the technical field of engineering plastic preparation, in particular to an engineering plastic production drying process which comprises the following steps: S1, filling plastic particles into a drying barrel of a plastic drying device; s2, a heating device is started to heat air, and the air subjected to water-air separation and filtration is heated; s3, the heating device is closed, and the negative pressure device is started; the plastic drying device in the S1 comprises a support, a barrel is fixedly mounted at the upper end of the support, and the plastic drying device further comprises a lifting mechanism which is mounted on the barrel and extends into the inner barrel; the driving assembly drives the connecting base to move upwards, meanwhile, the lifting mechanism synchronously drives the inner barrel to rotate, materials in the inner barrel can make centrifugal movement through rotation of the inner barrel, mixing of the materials in the inner barrel is facilitated, and in the upward moving process of the groove body, part of the materials are continuously discharged from the end opening below the groove body; and therefore, water vapor in the materials can be fully discharged, the water vapor in the plastic particles can be quickly dispersed, and the materials can be dried more thoroughly.

Description

Technical Field

[0001] This invention relates to the field of engineering plastics preparation technology, and in particular to a drying process for engineering plastics production. Background Technology

[0002] In the plastics manufacturing industry, the degree of dryness of plastic granules is closely related to the mechanical properties of the final product, such as transparency and color purity, as well as its electrical properties, including insulation and conductivity. Therefore, plastic granules must undergo appropriate drying treatment before being fed into injection molding machines, extruders, thermoforming machines, or other plastic processing machinery.

[0003] An existing plastic drying device, patent application number CN201820084204.1, specifically discloses a device including a support pile, a second drive mechanism located inside the support pile, and a first rotating shaft. The plastic drying device provided by this utility model can effectively dry plastics while rotating, achieving high drying efficiency and thorough drying. It also allows for the dehumidification of hot air for easy recycling, making it economical and environmentally friendly. Existing plastic drying devices heat the material inside the device using heating elements. Because the material surface has a large amount of water adhering to it, water vapor is continuously generated during heating. Due to the high content of plastic particles, the water vapor cannot quickly dissipate from the plastic particles, resulting in incomplete drying and high energy consumption. Therefore, we propose a drying process for engineering plastics production. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that in the existing plastic drying device, heating the material inside the device with heating elements results in incomplete drying because the material surface has a lot of water attached to it and water vapor is continuously generated during the heating process. Due to the large content of plastic particles, the water vapor cannot be quickly dissipated inside the plastic particles. Therefore, this invention proposes a drying process for engineering plastics production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Design a drying process for engineering plastics production, including the following steps:

[0007] S1: Load the plastic granules into the drying drum of the plastic drying device;

[0008] S2: Turn on the heating device to heat the air. Heat the air that has been filtered by water-air separation and introduce it into the bottom of the drying barrel. Stir and heat the plastic granules in the heating barrel to about 70-80℃ and continue heating for 10-20 minutes.

[0009] S3: Turn off the heating device and start the negative pressure device. The negative pressure device will draw a vacuum into the drying barrel, and at the same time, the stirring device will stir the plastic particles evenly so that the moisture contained in the plastic particles will be completely dried by the negative pressure device.

[0010] The plastic drying device in S1 includes a support frame, a cylinder fixedly mounted on the upper end of the support frame, an opening at the upper end of the cylinder, a heating mechanism disposed at the lower end of the cylinder, the heating mechanism being horizontally disposed within the cylinder, a bearing sleeve installed within the cylinder, the bearing sleeve being disposed above the heating mechanism, the bearing sleeve being coaxial with the cylinder, an inner cylinder installed inside the bearing sleeve, the inner cylinder being coaxial with the cylinder, a plurality of evenly distributed vent holes being opened at the bottom of the inner cylinder, and spline grooves being opened on both sides of the inner cylinder, the spline grooves on both sides being symmetrically distributed.

[0011] It also includes a lifting mechanism, which is mounted on the cylinder and extends into the inner cylinder.

[0012] Preferably, the heating mechanism includes a heating ring, which is arranged laterally inside the cylinder and coaxial with the cylinder, and the heating ring is fixedly connected to the cylinder.

[0013] Preferably, the lifting mechanism includes a trough, which is open at both the top and bottom. The trough is cross-shaped and coaxial with the cylinder. Multiple conical strips arranged in a circular array are arranged inside the trough. The cross-section of each conical strip is triangular, and the opposite ends of the multiple conical strips are connected as one unit. Multiple connecting rods arranged in a circular array are fixedly installed on each conical strip, and the ends of the connecting rods are fixedly connected to the inside of the trough. Connecting seats are rotatably installed at the joints of the multiple conical strips. Slider blocks are fixedly installed on both sides of the trough, and the sliders are slidably disposed in spline grooves. The lifting mechanism also includes a drive assembly, which is mounted on the cylinder and connected to the connecting seats.

[0014] Preferably, the drive assembly includes two spaced-apart support plates fixed to the upper end of the cylinder. A horizontal shaft is rotatably mounted between the two support plates. A guide wheel is fixedly mounted on the horizontal shaft. A support frame is fixedly mounted on the outer side of the cylinder. A drive shaft is fixedly mounted on the support frame. A reel is fixedly mounted on the drive shaft. One end of the drive shaft passes through the support frame. A rope is fixedly mounted on the inner side of the reel. The rope passes through the guide wheel and is guided by the guide wheel to be vertically upward. The lower end of the rope is fixedly connected to a connecting seat. A first incomplete gear is fixedly mounted on one end of the drive shaft. A motor is fixedly mounted on the support frame. A second incomplete gear is fixedly mounted on the output shaft end of the motor. The second incomplete gear meshes with the first incomplete gear.

[0015] Preferably, it also includes a synchronous stirring mechanism, which is disposed inside the inner cylinder and connected to the tank.

[0016] Preferably, the synchronous stirring mechanism includes a plurality of stirring bars arranged in a circumferential array, one end of which is fixedly connected to the tank.

[0017] Preferably, a bottom shaft is fixedly installed at the bottom of the inner cylinder, the lower end of the bottom shaft passes through the heating ring, and a first bevel gear is fixedly installed at the lower end of the bottom shaft. A first rotating shaft is rotatably installed inside the cylinder, the first rotating shaft passes through the cylinder, and a second bevel gear is fixedly installed at the end of the first rotating shaft. The second bevel gear meshes with the first bevel gear. The system also includes a belt drive mechanism, one end of the drive shaft passes through the support frame, and the belt drive mechanism is installed at the ends of the drive shaft and the first rotating shaft. The drive shaft and the first rotating shaft can be driven by the belt drive mechanism.

[0018] Preferably, it also includes a dehumidification mechanism, which is installed on the cylinder and communicates with the cylinder.

[0019] Preferably, the dehumidification mechanism includes an air pump located at the lower end of the cylinder. The air pump's inlet end is connected to and fixedly installed with an air inlet pipe. The upper end of the air inlet pipe is fixedly connected to the bottom of the cylinder and communicates with the inside of the cylinder. A valve is installed on the air inlet pipe. The air pump's exhaust end is connected to and fixedly installed with a pipeline. Two spaced-apart boxes are fixedly installed at the bottom of the cylinder. Each box is fixedly installed with a connecting seat, which is fixedly connected to the cylinder. Each box is filled with a water-absorbing medium. The pipeline has two exhaust ports, which are respectively inserted into the boxes on both sides.

[0020] Preferably, the lower end of the cylinder has multiple exhaust holes arranged in a circumferential array, and multiple mounting brackets arranged in a circumferential array are fixedly installed on the cylinder. Each mounting bracket has a sealing plug passing through it, and each mounting bracket has a friction wheel installed inside it. The friction wheels are respectively driven by friction with the sealing plugs. A first universal coupling is installed between two adjacent friction wheels, and a second universal coupling is installed between the first rotating shaft and the first universal coupling.

[0021] The drying process for engineering plastics production proposed in this invention has the following advantages:

[0022] By setting a drive component to move the connecting seat upward, the lifting mechanism simultaneously drives the inner cylinder to rotate. The rotation of the inner cylinder causes the material inside to undergo centrifugal motion, which helps to mix the material inside the inner cylinder. In the initial state, the tank is buried inside the material. As the material enters the internal space of the tank, it is carried to a higher position as the tank moves upward. During the upward movement of the tank, some material is continuously discharged from the lower port of the tank. Due to the setting of multiple conical bars, the material is slowly discharged from the lower port of the tank with a reduced discharge volume, thereby allowing the material to fully expel the moisture inside. This helps the moisture inside the plastic granules to dissipate quickly, thus making the material dry more thoroughly and reducing the energy consumption of the device.

[0023] The rotation of the first shaft simultaneously drives the rotation of one of the first universal couplings via the second universal coupling. The first universal coupling drives the friction wheels on both sides to rotate. The friction wheels and the sealing plug are driven by friction, thus the friction wheels drive the sealing plug to move horizontally. During the heating process, the sealing plug continuously reciprocates within the vent. With the vent open to the outside, water vapor is quickly discharged from the vent, preventing water vapor from accumulating inside the cylinder. After the water vapor is discharged, the vent is sealed by the sealing plug. With the vent blocked from the outside, heat dissipation inside the cylinder is prevented, and low-temperature outside air is prevented from continuously entering the cylinder, which would affect the heating efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a plastic drying device for an engineering plastics production drying process proposed in this invention.

[0025] Figure 2 This is a cross-sectional view of a plastic drying apparatus for an engineering plastics production drying process proposed in this invention. Figure 1 .

[0026] Figure 3 This is a cross-sectional view of a plastic drying apparatus for an engineering plastics production drying process proposed in this invention. Figure 2 .

[0027] Figure 4 This is an enlarged cross-sectional view of a plastic drying device for an engineering plastics production drying process proposed in this invention.

[0028] Figure 5 This is a partial enlarged schematic diagram of the tank body of a plastic drying device for an engineering plastics production drying process proposed in this invention.

[0029] Figure 6 This is an enlarged schematic diagram of a portion of the structure of the guide wheel of a plastic drying device in an engineering plastics production drying process proposed in this invention.

[0030] Figure 7This is an enlarged schematic diagram of a portion of the air pump structure in the drying process for engineering plastics production proposed in this invention.

[0031] Figure 8 This is a partial enlarged schematic diagram of the sealing plug of a plastic drying device in an engineering plastics production drying process proposed in this invention.

[0032] In the diagram: 1. Support frame; 2. Cylinder; 3. Bearing sleeve; 4. Inner cylinder; 5. Spline groove; 6. Heating ring; 7. Groove; 8. Conical strip; 9. Connecting rod; 10. Connecting seat; 11. Slider; 12. Support plate; 13. Horizontal shaft; 14. Guide wheel; 15. Support frame; 16. Drive shaft; 17. Reel; 18. Rope; 19. First incomplete gear; 20. Motor; 21. Second incomplete gear; 22. Stirring strip; 23. Bottom shaft; 24. First bevel gear; 25. First rotating shaft; 26. Second bevel gear; 27. Belt drive mechanism; 28. Air pump; 29. ​​Air inlet pipe; 30. Valve; 31. Pipeline; 32. Box; 33. Connecting seat; 34. Water absorption medium; 35. Exhaust hole; 36. Mounting bracket; 37. Friction wheel; 38. First universal coupling; 39. Sealing plug; 40. Second universal coupling. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1:

[0035] Reference Figure 1-8 A drying process for engineering plastics production includes the following steps:

[0036] S1: Load the plastic granules into the drying drum of the plastic drying device;

[0037] S2: Turn on the heating device to heat the air. Heat the air that has been filtered by water-air separation and introduce it into the bottom of the drying barrel. Stir and heat the plastic granules in the heating barrel to about 70-80℃ and continue heating for 10-20 minutes.

[0038] S3: Turn off the heating device and start the negative pressure device. The negative pressure device will draw a vacuum into the drying barrel, and at the same time, the stirring device will stir the plastic particles evenly so that the moisture contained in the plastic particles will be completely dried by the negative pressure device.

[0039] The plastic drying device in S1 includes a support 1, a cylinder 2 fixedly installed on the upper end of the support 1, the upper end of the cylinder 2 being open, a heating mechanism installed at the lower end of the cylinder 2 being horizontally arranged inside the cylinder 2, a bearing sleeve 3 installed inside the cylinder 2 being positioned above the heating mechanism, the bearing sleeve 3 being coaxial with the cylinder 2, an inner cylinder 4 installed inside the bearing sleeve 3 being coaxial with the cylinder 2, a number of evenly distributed vent holes being opened at the bottom of the inner cylinder 4, and spline grooves 5 being opened on both sides of the inner cylinder 4 being symmetrically distributed.

[0040] Plastic granules are added into the inner cylinder 4 and heated by a heating mechanism. The inner cylinder 4 can be lifted vertically by setting a spline groove 5. The mechanism also includes a lifting mechanism, which is installed on the cylinder 2 and extends into the inner cylinder 4. The lifting mechanism agitates the material in the inner cylinder 4 and also lifts some of it to a high place before letting it fall freely. The heating mechanism includes a heating ring 6, which is horizontally arranged in the cylinder 2 and coaxial with the cylinder 2. The heating ring 6 is fixed to the cylinder 2. During the heating process, the heating ring 6 is activated to heat the bottom of the inner cylinder 4. The vent holes at the bottom of the inner cylinder 4 help to expel moisture from inside the inner cylinder 4.

[0041] The lifting mechanism includes a trough 7, which is open at both the top and bottom. The trough 7 is cross-shaped and coaxial with the cylinder 2. Multiple conical strips 8 arranged in a circular array are arranged on the inner side of the trough 7. The cross-section of the conical strips 8 is triangular. The opposite ends of the multiple conical strips 8 are connected as one unit. Multiple connecting rods 9 arranged in a circular array are fixedly installed on the conical strips 8. The ends of the connecting rods 9 are fixedly connected to the inner side of the trough 7. Connecting seats 10 are rotatably installed at the connection points of the multiple conical strips 8. Slider blocks 11 are fixedly installed on both sides of the trough 7. The sliders 11 are slidably arranged in the spline grooves 5. The lifting mechanism also includes a drive assembly, which is installed on the cylinder 2 and connected to the connecting seats 10.

[0042] Working principle: The drive component moves the connecting seat 10 upward, while the lifting mechanism simultaneously rotates the inner cylinder 4. The rotation of the inner cylinder 4 causes the material inside to undergo centrifugal motion, which helps to mix the material inside the inner cylinder 4. The tank 7 is initially buried inside the material. The material enters the internal space of the tank 7 and is carried to a higher position as the tank 7 moves upward. During the upward movement of the tank 7, some material is continuously discharged from the lower port of the tank 7. Due to the setting of multiple conical bars 8, the material is slowly discharged from the lower port of the tank 7 and the discharge volume is reduced, so that the material can fully discharge the moisture inside. Therefore, it helps the moisture inside the plastic granules to dissipate quickly, thereby making the material dry more thoroughly and reducing the energy consumption of the device.

[0043] Example 2:

[0044] Reference Figure 1-8 As another preferred embodiment of the present invention, the difference from embodiment 1 is that the drive assembly includes two spaced-apart support plates 12, which are fixedly connected to the upper end of the cylinder 2. A horizontal shaft 13 is rotatably mounted between the two support plates 12. A guide wheel 14 is fixedly mounted on the horizontal shaft 13. A support frame 15 is fixedly mounted on the outside of the cylinder 2. A drive shaft 16 is fixedly mounted on the support frame 15. A reel 17 is fixedly mounted on the drive shaft 16. One end of the drive shaft 16 passes through the support frame 15. A rope 18 is fixedly mounted on the inner side of the reel 17. The rope 18 passes through the guide wheel 14 and is guided by the guide wheel 14 to be vertically upward. The lower end of the rope 18 is fixedly connected to the connecting seat 10. A first incomplete gear 19 is fixedly mounted on one end of the drive shaft 16. A motor 20 is fixedly mounted on the support frame 15. A second incomplete gear 21 is fixedly mounted on the output shaft end of the motor 20. The second incomplete gear 21 meshes with the first incomplete gear 19. The motor 20 operates and drives the second incomplete gear 21 to rotate. The second incomplete gear 21 drives the first incomplete gear 19 to rotate intermittently. During the rotation of the first incomplete gear 19, the drive shaft 16 rotates synchronously. The reel 17 on the drive shaft 16 rotates and winds up the rope 18. The guide wheel 14 winds up the rope 18. The upper end of the rope 18 is wound up and synchronously drives the connecting seat 10 and the trough 7 to move upward. When the second incomplete gear 21 separates from the first incomplete gear 19, the trough 7 moves downward under its own weight, so that the trough 7 can continue to return to the material. The trough 7 continues to sink into the material under its own weight. Afterward, the second incomplete gear 21 and the first incomplete gear 19 continue to mesh and repeat the above working process.

[0045] It also includes a synchronous stirring mechanism, which is located inside the inner cylinder 4 and connected to the tank body 7. The synchronous stirring mechanism includes multiple stirring bars 22 arranged in a circumferential array, with one end of each stirring bar 22 fixedly connected to the tank body 7. A bottom shaft 23 is fixedly installed at the bottom of the inner cylinder 4, with the lower end of the bottom shaft 23 passing through the heating ring 6. A first bevel gear 24 is fixedly installed at the lower end of the bottom shaft 23. A first rotating shaft 25 is rotatably installed inside the cylinder body 2, passing through the cylinder body 2. A second bevel gear 26 is fixedly installed at the end of the first rotating shaft 25, and the second bevel gear 26 meshes with the first bevel gear 24. It also includes a belt drive mechanism 27, with one end of the drive shaft 16 passing through the support frame 15. The belt drive mechanism 27 is installed at the ends of the drive shaft 16 and the first rotating shaft 25, and the drive shaft 16 and the first rotating shaft 25 can be driven by the belt drive mechanism 27. While the drive shaft 16 rotates, it is transmitted to the first rotating shaft 25 through the belt drive mechanism 27. The second bevel gear 26 at the end of the first rotating shaft 25 rotates and drives the first bevel gear 24 to rotate. The first bevel gear 24 rotates synchronously with the bottom shaft 23, and the bottom shaft 23 rotates synchronously with the inner cylinder 4.

[0046] It also includes a dehumidification mechanism, which is installed on and connected to the cylinder 2. The dehumidification mechanism includes an air pump 28, which is located at the lower end of the cylinder 2. The air pump 28 has an air inlet pipe 29 that is connected to and fixedly installed at its inlet end. The upper end of the air inlet pipe 29 is fixedly connected to the bottom of the cylinder 2 and communicates with the inside of the cylinder 2. A valve 30 is installed on the air inlet pipe 29. A pipe 31 is connected to and fixedly installed at the exhaust end of the air pump 28. Two spaced boxes 32 are fixedly installed at the bottom of the cylinder 2. Each box 32 has a connecting seat 33 that is fixedly installed on it and is fixedly connected to the cylinder 2. Each box 32 is filled with a water-absorbing medium 34. The pipe 31 has two exhaust ports that are respectively inserted into the boxes 32 on both sides. The lower end of the cylinder 2 has multiple exhaust holes 35 arranged in a circular array. Multiple mounting brackets 36 arranged in a circular array are fixedly installed on the cylinder 2. Each mounting bracket 36 has a sealing plug 39 passing through it. Each mounting bracket 36 has a friction wheel 37 installed inside it. The friction wheel 37 is driven by friction with the sealing plug 39. A first universal coupling 38 is installed between two adjacent friction wheels 37. A second universal coupling 40 is installed between the first rotating shaft 25 and the first universal coupling 38.

[0047] Open valve 30 and pump 28 to draw water vapor from cylinder 2. Water vapor enters pipe 31 through air inlet pipe 29. Water vapor discharged from pipe 31 enters box 32. Water vapor comes into contact with water-absorbing medium 34 in box 32 and reacts. Water-absorbing medium 34 absorbs water vapor, thereby preventing water vapor from accumulating inside cylinder 2.

[0048] While the first rotating shaft 25 rotates, it drives one of the first universal couplings 38 to rotate through the second universal coupling 40. The first universal coupling 38 drives the friction wheels 37 on both sides to rotate. The friction wheels 37 and the sealing plug 39 are driven by friction, so the friction wheels 37 drive the sealing plug 39 to move in the horizontal direction. During the heating process, the sealing plug 39 moves back and forth in the exhaust hole 35. With the exhaust hole 35 connected to the outside, water vapor is quickly discharged from the exhaust hole 35 to avoid the accumulation of water vapor in the cylinder 2. After the water vapor is discharged, the exhaust hole 35 is sealed by the sealing plug 39. With the exhaust hole 35 blocked from the outside, heat dissipation inside the cylinder 2 is prevented, and low-temperature air from the outside is prevented from continuously entering the cylinder 2 and affecting the heating efficiency.

[0049] Working principle: The motor 20 works and drives the second incomplete gear 21 to rotate. The second incomplete gear 21 drives the first incomplete gear 19 to rotate intermittently. During the rotation of the first incomplete gear 19, the drive shaft 16 rotates synchronously. The reel 17 on the drive shaft 16 rotates and winds up the rope 18. The guide wheel 14 winds up the rope 18. The upper end of the rope 18 is wound up and synchronously drives the connecting seat 10 and the trough 7 to move upward. When the second incomplete gear 21 separates from the first incomplete gear 19, the trough 7 moves downward under its own weight, so that the trough 7 can continue to return to the material. The trough 7 continues to sink into the material under its own weight. Then the second incomplete gear 21 and the first incomplete gear 19 continue to mesh and repeat the above working process. While the drive shaft 16 rotates, it transmits power to the first rotating shaft 25 via the belt drive mechanism 27. The second bevel gear 26 at the end of the first rotating shaft 25 rotates and drives the first bevel gear 24 to rotate. The first bevel gear 24 rotates synchronously with the bottom shaft 23, and the bottom shaft 23 rotates synchronously with the inner cylinder 4. While the first rotating shaft 25 rotates, it drives one of the first universal couplings 38 to rotate via the second universal coupling 40. The first universal coupling 38 drives the friction wheels 37 on both sides to rotate. The friction wheels 37 and the sealing plug 39 are driven by friction, so that the friction wheels 37 drive the sealing plug 39 to move horizontally. During the heating process, the sealing plug 39 continuously reciprocates in the vent hole 35. With the vent hole 35 connected to the outside, water vapor is quickly discharged from the vent hole 35 to prevent water vapor from accumulating in the cylinder 2. After the water vapor is discharged, the sealing plug 39 seals the vent hole 35. With the vent hole 35 blocked from the outside, heat dissipation inside the cylinder 2 is prevented.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drying process for engineering plastics production, characterized in that, Includes the following steps: S1: Load the plastic granules into the drying drum of the plastic drying device; S2: Turn on the heating device to heat the air. Heat the air that has been filtered by water-air separation and introduce it into the bottom of the drying barrel. Stir and heat the plastic granules in the heating barrel to about 70-80℃ and continue heating for 10-20 minutes. S3: Turn off the heating device and start the negative pressure device. The negative pressure device will draw a vacuum into the drying barrel, and at the same time, the stirring device will stir the plastic particles evenly so that the moisture contained in the plastic particles will be completely removed by the negative pressure device. The plastic drying device in S1 includes a support (1), a cylinder (2) is fixedly installed on the upper end of the support (1), the upper end of the cylinder (2) is open, a heating mechanism is provided at the lower end of the cylinder (2), the heating mechanism is arranged horizontally inside the cylinder (2), a bearing sleeve (3) is installed inside the cylinder (2), the bearing sleeve (3) is located at the upper end of the heating mechanism, the bearing sleeve (3) is coaxial with the cylinder (2), an inner cylinder (4) is installed inside the bearing sleeve (3), the inner cylinder (4) is coaxial with the cylinder (2), a number of evenly distributed vent holes are opened at the bottom of the inner cylinder (4), and spline grooves (5) are opened on both sides of the inner cylinder (4), the spline grooves (5) on both sides are symmetrically distributed; It also includes a lifting mechanism, which is mounted on the cylinder (2) and extends into the inner cylinder (4).

2. The drying process for engineering plastics production according to claim 1, characterized in that, The heating mechanism includes a heating ring (6), which is arranged laterally inside the cylinder (2) and is coaxial with the cylinder (2). The heating ring (6) is fixedly connected to the cylinder (2).

3. The drying process for engineering plastics production according to claim 1, characterized in that, The lifting mechanism includes a trough (7) with open upper and lower ends. The trough (7) is cross-shaped and coaxial with the cylinder (2). Multiple conical strips (8) arranged in a circular array are arranged on the inner side of the trough (7). The cross-section of the conical strips (8) is triangular. The opposite ends of the multiple conical strips (8) are connected as one unit. Multiple connecting rods (9) arranged in a circular array are fixedly installed on the conical strips (8). The ends of the connecting rods (9) are fixedly connected to the inner side of the trough (7). Connecting seats (10) are rotatably installed at the connection points of the multiple conical strips (8). Slider blocks (11) are fixedly installed on both sides of the trough (7). The sliders (11) are slidably arranged in the spline grooves (5). The lifting mechanism also includes a drive assembly, which is installed on the cylinder (2) and connected to the connecting seats (10).

4. The drying process for engineering plastics production according to claim 3, characterized in that, The drive assembly includes two spaced-apart support plates (12), which are fixedly connected to the upper end of the cylinder (2). A horizontal shaft (13) is rotatably mounted between the two support plates (12). A guide wheel (14) is fixedly mounted on the horizontal shaft (13). A support frame (15) is fixedly mounted on the outside of the cylinder (2). A drive shaft (16) is fixedly mounted on the support frame (15). A reel (17) is fixedly mounted on the drive shaft (16). One end of the drive shaft (16) passes through the support frame (15). The reel (17)... 7) A rope (18) is fixedly installed on the inner side. The rope (18) passes through the guide wheel (14) and is vertically upward by the guide wheel (14). The lower end of the rope (18) is fixedly connected to the connecting seat (10). A first incomplete gear (19) is fixedly installed at one end of the drive shaft (16). A motor (20) is fixedly installed on the support frame (15). A second incomplete gear (21) is fixedly installed at the output shaft end of the motor (20). The second incomplete gear (21) meshes with the first incomplete gear (19).

5. The drying process for engineering plastics production according to claim 1, characterized in that, It also includes a synchronous stirring mechanism, which is located inside the inner cylinder (4) and connected to the tank (7).

6. The drying process for engineering plastics production according to claim 5, characterized in that, The synchronous stirring mechanism includes multiple stirring bars (22) arranged in a circular array, with one end of each stirring bar (22) fixedly connected to the tank (7).

7. The drying process for engineering plastics production according to claim 1, characterized in that, The bottom of the inner cylinder (4) is fixedly installed with a bottom shaft (23), the lower end of the bottom shaft (23) passes through the heating ring (6), the lower end of the bottom shaft (23) is fixedly installed with a first bevel gear (24), the inner side of the cylinder (2) is rotatably installed with a first rotating shaft (25), the first rotating shaft (25) passes through the cylinder (2), the end of the first rotating shaft (25) is fixedly installed with a second bevel gear (26), the second bevel gear (26) meshes with the first bevel gear (24), and also includes a belt drive mechanism (27), one end of the drive shaft (16) passes through the support frame (15), the belt drive mechanism (27) is installed at the ends of the drive shaft (16) and the first rotating shaft (25), and the drive shaft (16) and the first rotating shaft (25) can be driven by the belt drive mechanism (27).

8. The drying process for engineering plastics production according to claim 1, characterized in that, It also includes a dehumidification mechanism, which is installed on the cylinder (2) and communicates with the cylinder (2).

9. The drying process for engineering plastics production according to claim 8, characterized in that, The dehumidification mechanism includes an air pump (28), which is located at the lower end of the cylinder (2). The air pump (28) is connected to and fixedly installed with an air inlet pipe (29). The upper end of the air inlet pipe (29) is fixedly connected to the bottom of the cylinder (2) and communicates with the inside of the cylinder (2). A valve (30) is installed on the air inlet pipe (29). The exhaust end of the air pump (28) is connected to and fixedly installed with a pipeline (31). Two spaced boxes (32) are fixedly installed at the bottom of the cylinder (2). Each box (32) is fixedly installed with a connecting seat (33). The connecting seat (33) is fixedly connected to the cylinder (2). Each box (32) is filled with a water-absorbing medium (34). The pipeline (31) has two exhaust ports, and the two exhaust ports are respectively inserted into the boxes (32) on both sides.

10. The drying process for engineering plastics production according to claim 7, characterized in that, The lower end of the cylinder (2) is provided with a plurality of exhaust holes (35) arranged in a circular array. A plurality of mounting brackets (36) arranged in a circular array are fixedly installed on the cylinder (2). Each mounting bracket (36) has a sealing plug (39) passing through it. Each mounting bracket (36) has a friction wheel (37) installed inside it. The friction wheel (37) is driven by friction with the sealing plug (39). A first universal coupling (38) is installed between two adjacent friction wheels (37). A second universal coupling (40) is installed between the first rotating shaft (25) and the first universal coupling (38).

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