Plastic particle drying device

Abstract

The utility model discloses a plastic particle drying device which is characterized in that an air feeder is mounted outside a charging barrel, an air outlet of the air feeder is communicated with the charging barrel through a heater, and a motor is mounted on a top plate of the charging barrel; a rotating shaft of the spiral conveyor is installed on an output shaft of the motor, the spiral conveyor is sleeved with the conveying cylinder, the upper end and the lower end of the conveying cylinder are open, the conveying cylinder is connected to the top plate through a hanging rod, and a distance exists between the top of the conveying cylinder and the top plate. Spiral blades of the spiral conveyor upwards extend out of the top of the conveying barrel and downwards extend out of the bottom of the conveying barrel, and the spiral conveyor is used for lifting plastic particles at the bottom of the charging barrel to the top of the charging barrel through the conveying barrel; a discharging valve is installed at the bottom of the charging barrel, a discharging pipe is installed on the lower side of the discharging valve, and a feeding pipe is installed on the top plate. By the adoption of the plastic particle drying device, plastic particles at the bottom of the material barrel can be conveyed to the top end of the conveying barrel through the spiral conveyor and overflow, so that the plastic particles flow orderly, and the drying uniformity of the plastic particles is improved.

Description

Technical Field

[0001] The utility model relates to a drying device for plastic particles. Background Art

[0002] Plastic particles need to be cooled in a water bath during processing. In addition, during storage, they will absorb moisture from the air, affecting the mechanical properties of plastic products. In order to ensure the quality of plastic products, a drying device is needed to dry the plastic particles used as raw materials before the production of plastic products.

[0003] When drying plastic particles, hot air is usually used to dry the plastic particles in the barrel. The plastic particles in the barrel are gradually dried from the bottom to the top. When the plastic particles in the upper part are dried, the plastic particles in the lower part are baked in hot air for a long time, which will have a certain adverse effect on the chemical properties and mechanical properties of the plastic particles themselves. At the same time, since the hot air flows upward, the flow rate in the central area of ​​the barrel is greater than the flow rate near the barrel wall, which further causes the water content of the outer plastic particles to be higher than the water content of the inner area, further aggravating the unevenness of the water content of the plastic particles. Although the overall water content of the plastic particles after drying can meet the requirements, due to the uneven water content of each plastic particle, the internal quality of the produced plastic products is uneven, affecting the overall quality of the product. Utility Model Content

[0004] In order to solve the problem that a small amount of plastic particles still have excessive water content after adding a stirring paddle in the prior art, the present application proposes a plastic particle drying device, which includes a barrel, a blower is installed on the outside of the barrel, the air outlet of the blower is connected to the lower part of the barrel through a heater, a motor is fixedly installed on the top plate of the barrel, and the output shaft of the motor extends downward; a screw conveyor includes a rotating shaft and a spiral blade welded on the rotating shaft, the rotating shaft is installed on the output shaft, and a set of screw conveyors is provided in the barrel. The conveying cylinder has an open top and a lower end, is connected to the top plate via a suspension rod, and a distance is provided between the top of the conveying cylinder and the top plate, and a distance is provided between the top of the conveying cylinder and the bottom of the conveying cylinder; the upper end of the spiral blade extends upward from the top of the conveying cylinder, and the lower end of the spiral blade extends downward from the bottom of the conveying cylinder, and the screw conveyor is used to lift the plastic particles at the bottom of the barrel to the top of the barrel through the conveying cylinder; a discharge valve is installed at the bottom of the barrel, a discharge pipe is installed at the lower side of the discharge valve, and a feed pipe is installed on the top plate.

[0005] When the present application is used to dry plastic particles, the plastic particles are fed into the barrel through the feed pipe, the motor and the blower are started, and the airflow discharged by the blower is heated when passing through the heater to become hot air, and the hot air enters the barrel to dry the plastic particles in the barrel, and the hot air that rises to the top of the barrel is discharged from the barrel through the feed pipe. Driven by the motor, the screw conveyor starts to rotate, and the plastic particles at the bottom of the barrel enter the conveying barrel under the drive of the screw conveyor and gradually move upward. When exceeding the top of the conveying barrel, the plastic particles overflow from the gap between the conveying barrel and the top plate, enter the space between the conveying barrel and the barrel, and gradually move downward, thereby allowing the plastic particles in the barrel to flow in an orderly manner in the vertical direction, so that the hot air can dry the plastic particles more evenly. When the drying is completed, the discharge valve is opened and the plastic particles are discharged through the discharge pipe. Since a screw conveyor is used to push the plastic particles to the top and then flow downward under the action of gravity, the plastic particles in the barrel can flow greatly in the barrel, thereby improving the uniformity of the drying of the plastic particles.

[0006] Furthermore, in order to improve the drying efficiency, a vent hole is provided on the conveying cylinder. This design enables the hot air inside and outside the conveying cylinder to communicate smoothly, thereby improving the uniformity of the hot air in the barrel.

[0007] Specifically, for ease of operation, the discharge valve is a plug valve.

[0008] Specifically, the barrel includes a cylindrical main barrel and a cone barrel welded to the lower end of the main barrel, the small end of the cone barrel faces downward, the discharge valve is installed at the bottom of the cone barrel, and the lower end of the spiral blade extends into the cone barrel; the discharge valve also forms the bottom plate of the barrel. After the cone barrel is set, the plastic particles at the bottom of the barrel can smoothly enter the conveying barrel and participate in the material flow process to evenly remove moisture.

[0009] Specifically, the heater is installed on the cone, and the heater includes a shell installed on the cone, the shell extends in the horizontal direction, the air outlet of the blower is connected to the inner cavity of the shell, an end plate is detachably installed on the side of the shell away from the cone, the electric heating tube is located in the shell, and the two electrodes of the electric heating tube are fixed on the end plate and connected to the power connector. This design can make the hot air flow through the bottom of the barrel to the maximum extent, so as to evenly heat the plastic particles in the barrel.

[0010] Furthermore, in order to reduce the noise generated by the gas flow, the air outlet of the blower is connected to the casing via a muffler.

[0011] Further, for easy disassembly, the top plate is detachably mounted on the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0013] A plastic particle drying device, see Figure 1 , which includes a barrel 10, which includes a cylindrical main barrel 11 and a cone barrel 12 welded to the lower end of the main barrel, the small end of the cone barrel 12 faces downward, and a discharge valve 13 is installed at the lower end of the cone barrel 12, and a discharge pipe 14 is installed on the lower side of the discharge valve, and the discharge valve also forms the bottom plate of the barrel. A support column 61 is welded at the central part of the base 60, and the barrel 10 is installed on the support column. Specifically in this embodiment, the discharge valve is a plug valve.

[0014] An upper flange 15 is welded on the top of the barrel, and a top plate 16 is detachably mounted on the upper flange via connecting bolts 17. A feed pipe 18 is mounted on the top plate and is connected to the inner cavity of the barrel.

[0015] A motor seat 36 is installed in the center of the upper side of the top plate 16, and a motor 34 is fixedly installed on the motor seat, and the output shaft of the motor extends downward. A screw conveyor 31 is installed in the barrel, and the screw conveyor 31 includes a rotating shaft 311 and a spiral blade 312 welded on the rotating shaft. The rotating shaft extends in the vertical direction and is installed on the output shaft 35 of the motor through a coupling 33.

[0016] There is a set of conveying cylinder 21 arranged on the screw conveyor 31 in the barrel 10. The upper and lower ends of the conveying cylinder 21 are open. The conveying cylinder 21 is connected to the top plate through four suspension rods 23. The four suspension rods 23 are evenly spaced. There is a distance between the top of the conveying cylinder 21 and the top plate 16. The space between the conveying cylinder and the top plate forms a reflux hole. There are air holes 22 on the conveying cylinder 21. The screw conveyor 31 is used to lift the plastic particles at the bottom of the barrel to the top of the barrel through the conveying cylinder.

[0017] The upper end of the spiral blade 312 extends upward from the top of the conveying cylinder 21, and there is a distance between the bottom of the conveying cylinder and the discharge valve, that is, there is a distance between the bottom of the conveying cylinder and the bottom plate of the barrel. The lower end of the spiral blade 312 extends downward from the bottom of the conveying cylinder 21. Specifically in this embodiment, the lower end of the spiral blade extends into the cone.

[0018] A heater 32 is installed on the cone 12. The heater 32 includes a shell 321 extending in the horizontal direction. One end of the shell is welded to the air inlet 121 on the cone, and an end plate flange 322 is welded to the other end of the shell. The end plate 323 is installed on the end plate flange 322 by locking bolts. The electric heating tube 326 is located in the shell, and the two electrodes of the electric heating tube are fixed on the end plate and connected to the power connector 325. Specifically in this embodiment, a ceramic ring 324 is respectively sleeved on both ends of the electric heating tube, and the sleeve ring is bonded to the end plate. A connection port is opened on the upper side of the outer peripheral surface of the shell, and a muffler 53 is installed on the connection port in the vertical direction. The blower 51 is located outside the barrel, and the air outlet 52 of the blower is connected to the upper end of the muffler through a flange. That is, the air outlet of the blower is connected to the shell through the muffler.

[0019] In order to detect the temperature in the barrel, a thermocouple 19 is installed on the cone.

[0020] When the present embodiment is in operation, the plastic particles are fed into the barrel through the feed pipe 18, the motor and the blower are started, and the airflow discharged by the blower is heated when flowing through the heater 32 to become hot air, and the hot air enters the barrel to dry the plastic particles in the barrel, and the hot air rising to the top of the barrel is discharged from the barrel through the feed pipe. Driven by the motor, the screw conveyor 31 starts to rotate, and the plastic particles at the bottom of the barrel enter the conveying cylinder 21 driven by the bolt blades, and gradually move upward. When exceeding the top of the conveying cylinder, the plastic particles overflow from the reflux hole between the conveying cylinder and the top plate, enter the space between the conveying cylinder and the barrel, and gradually move downward, thereby allowing the plastic particles in the barrel to flow in an orderly manner in the vertical direction, so that the hot air can dry the plastic particles more evenly. At the same time, the hot air can also be quickly exchanged inside and outside the conveying cylinder through the air vents to improve the uniform arrangement of the hot air in the barrel. When the drying is completed, the discharge valve is opened and the plastic particles are discharged through the discharge pipe.

Claims

1. A drying device for plastic particles, characterized in that: The invention comprises a barrel, an air blower is installed on the outside of the barrel, the air outlet of the air blower is connected to the lower part of the barrel through a heater, a motor is fixedly installed on the top plate of the barrel, and the output shaft of the motor extends downward; the screw conveyor comprises a rotating shaft and a spiral blade welded on the rotating shaft, the rotating shaft is installed on the output shaft, a set of conveying barrels arranged on the screw conveyor is provided in the barrel, the upper and lower ends of the conveying barrel are both open, the conveying barrel is connected to the top plate through a suspension rod, and there is a distance between the top of the conveying barrel and the top plate, and there is a distance between the bottom of the conveying barrel and the bottom plate of the barrel; the upper end of the spiral blade extends upward from the top of the conveying barrel, and the lower end of the spiral blade extends downward from the bottom of the conveying barrel, and the screw conveyor is used to lift the plastic particles at the bottom of the barrel to the top of the barrel through the conveying barrel; a discharge valve is installed at the bottom of the barrel, the discharge pipe is installed on the lower side of the discharge valve, and a feed pipe is installed on the top plate.

2. The drying device according to claim 1, characterized in that: A vent hole is provided on the conveying cylinder.

3. The drying device according to claim 1, characterized in that: The discharge valve is a plug valve.

4. The drying device according to claim 1, characterized in that: The barrel comprises a cylindrical main barrel and a cone barrel welded to the lower end of the main barrel, the small end of the cone barrel faces downward, a discharge valve is installed at the bottom of the cone barrel, and the lower end of the spiral blade extends into the cone barrel; the discharge valve also forms the bottom plate of the barrel.

5. The drying device according to claim 4, characterized in that: The heater is installed on the cone, and the heater includes an outer shell installed on the cone, the outer shell extends in the horizontal direction, the air outlet of the blower is connected to the inner cavity of the outer shell, an end plate is detachably installed on the side of the outer shell away from the cone, the electric heating tube is located in the outer shell, and the two electrodes of the electric heating tube are fixed on the end plate and connected to a power connector.

6. The drying device according to claim 5, characterized in that: The air outlet of the blower is connected to the casing via a muffler.

7. The drying device according to claim 1, characterized in that: The top plate is detachably mounted on the barrel.

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