Continuous crystallization device for PET (Polyethylene Terephthalate) slices

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) slice continuous crystallization device which comprises a vacuum suction machine, a middle stock bin, a feeding rotary feeding valve, a rotary crystallization drying machine, a discharging rotary feeding valve and a finished product stock bin which are sequentially connected, and further comprises an electric heater and an air blower which are sequentially communicated with the rotary crystallization drying machine, the rotary crystallization dryer comprises a plurality of jackets for storing hot oil, and each jacket is provided with a hot oil inlet and a hot oil outlet. The rotary crystallization drying machine comprises a plurality of jackets used for storing hot oil, PET slices can be heated in a gradient mode by controlling the temperature of the hot oil input into the different jackets, adhesion, accumulation and uneven heating of the PET slices can be avoided through the rotary stirring rod, the finished product quality of the PET slices is remarkably improved, and the production cost is reduced. Meanwhile, through cooperation of the air blower and the electric heater, moisture evaporation of the PET slices is accelerated, and the efficiency of finished products is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to polymeric production equipment technical field especially relates to a PET chip continuous crystallization device. BACKGROUND

[0002] The principle of PET chip crystallization drying is that the drying medium (hot air or hot nitrogen) transmits heat to PET chip (heat transfer) to provide its temperature and evaporate the moisture on the chip surface; the moisture is transferred from the inside of the chip to the surface of the chip, which is continuously taken away by the hot air (mass transfer). The two processes are carried out at the same time, and are accompanied by the change of the structure of the polymer (crystallization) and the change of mass transfer (softening point). The purpose of PET chip crystallization drying is to prevent severe thermal degradation and hydrolysis reaction during the heating and melting process; to avoid the water contained in the PET chip from being gasified at high temperature, causing the spinning to be broken; to improve the softening point. In the production and processing process of PET chip, crystallization drying is an essential link, so a crystallization drying device needs to be used.

[0003] At present, there are mainly two forms of drum crystallization drying and fluidized bed crystallization drying on the market. The drum crystallization drying is gap type crystallization drying, and the PET chips are stacked together in the drum, which is easy to stick together, resulting in uneven heating and affecting the crystallization drying effect. The fluidized bed crystallization drying is continuous type crystallization drying, and the heating method is high-temperature circulating air, which has the disadvantage that the temperature of the high-temperature circulating air is single, and the gradient heating of the PET chip cannot be set, which causes incomplete crystallization of some PET special varieties and affects the production quality of downstream processing. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of PET chip continuous crystallization device to solve the problem of PET chip crystallization drying process sticking together in prior art, uneven heating, incomplete crystallization, affecting downstream processing production quality.

[0005] The technical scheme provided by the utility model is as follows:

[0006] A kind of PET chip continuous crystallization device, it includes vacuum suction feeder, intermediate bin, feeding rotary feeding valve, rotary crystallization dryer, discharge rotary feeding valve and finished product bin connected in sequence;The vacuum suction feeder is used to transport water-containing PET chip into the intermediate bin, and the feeding rotary feeding valve is used to input the water-containing PET chip in the intermediate bin into the rotary crystallization dryer, and the rotary crystallization dryer is used to heat and crystallize the water-containing PET chip, and the discharge rotary feeding valve is used to transport the PET chip product after heating and crystallization into the finished product bin;The rotary crystallization dryer includes a plurality of jackets for storing hot oil, and each jacket is provided with a hot oil inlet and a hot oil outlet.

[0007] Further, an electric heater and a blower are sequentially communicated with the rotary crystallization dryer, the electric heater is used for heating the cold air generated by the blower and then delivering the heated air into the rotary crystallization dryer, and the rotary crystallization dryer is provided with a corresponding hot air inlet and a hot air exhaust.

[0008] Further, the rotary crystallization dryer comprises a front chamber jacket, a middle chamber jacket and a rear chamber jacket, the front chamber jacket is provided with a front chamber jacket hot oil inlet and a front chamber jacket hot oil outlet, a front chamber jacket adjusting valve is arranged on a pipeline of the front chamber jacket hot oil inlet, the middle chamber jacket is provided with a middle chamber jacket hot oil inlet and a middle chamber jacket hot oil outlet, a middle chamber jacket adjusting valve is arranged on a pipeline of the middle chamber jacket hot oil inlet, and the rear chamber jacket is provided with a rear chamber jacket hot oil inlet and a rear chamber jacket hot oil outlet, a rear chamber jacket adjusting valve is arranged on a pipeline of the rear chamber jacket hot oil inlet.

[0009] Further, the rotary crystallization dryer comprises a barrel and a stirring main shaft located in the barrel, the barrel is provided with a material inlet and a material outlet at two ends respectively, and a plurality of stirring rods are arranged on the stirring main shaft.

[0010] Preferably, a plurality of units of stirring rods are arranged on the stirring main shaft at intervals, each unit comprises four groups of stirring rods, and the included angle between the stirring rods in the same unit is 45°.

[0011] Preferably, the distance between the outermost end of the stirring rod and the inner wall of the barrel is 12mm.

[0012] The beneficial effects of the present application are as follows:

[0013] In the present application, the rotary crystallization dryer comprises a plurality of jackets for storing hot oil, by controlling the temperature of the hot oil input into different jackets, the PET chips can be heated in a gradient manner, and by rotating the stirring rods, the adhesion and uneven heating of the PET chips can be avoided, the quality of the finished PET chips is significantly improved, and by cooperating the blower and the electric heater, the evaporation of the moisture of the PET chips is accelerated, and the efficiency of the finished product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application.

[0015] Figure 1 is a device structure schematic view provided by an embodiment of the present application;

[0016] Figure 2 is a structure schematic view of the rotary crystallization dryer provided by an embodiment of the present application;

[0017] Figure 3This is a schematic diagram of the AA cross-section of a rotary crystallizer provided in one embodiment of the present invention.

[0018] The reference numerals in the attached figures are as follows:

[0019] 1-Vacuum feeder, 2-Intermediate silo, 3-Infeed rotary feeder valve, 4-Rotary crystallizer, 401-Material inlet, 402-Material outlet, 403-Hot air inlet, 404-Hot air exhaust port, 405-Front chamber jacket, 406-Middle chamber jacket, 407-Rear chamber jacket, 408-Front chamber jacket hot oil inlet, 409-Front chamber jacket hot oil outlet, 410-Middle chamber jacket hot oil inlet, 411-Middle chamber jacket hot oil outlet, 412-Rear chamber jacket hot oil inlet, 413-Rear chamber jacket hot oil outlet, 414-Cylinder, 415-Agitator shaft, 416-Agitator rod, 5-Blower, 6-Electric heater, 7-Discharge rotary feeder valve, 8-Finished product silo, 9-Front chamber jacket regulating valve, 10-Middle chamber jacket regulating valve, 11-Rear chamber jacket regulating valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This embodiment provides a continuous crystallization apparatus for PET chips, such as... Figure 1 As shown, the rotary crystallizer 4 includes a vacuum feeder 1, an intermediate silo 2, a rotary feed valve 3, a rotary crystallizer 4, a blower 5, an electric heater 6, a rotary feed valve 7, and a finished product silo 8, which are connected in sequence. The rotary crystallizer 4 has a front chamber jacket regulating valve 9, a middle chamber jacket regulating valve 10, and a rear chamber jacket regulating valve 11 installed on the pipes of the front chamber jacket hot oil inlet 408, the middle chamber jacket hot oil inlet 410, and the rear chamber jacket hot oil inlet 412, respectively.

[0022] refer to Figure 1 and Figure 2The water-containing PET chips are sucked into the intermediate bin 2 by the vacuum suction machine 1, enter the feeding rotary valve 3 through the pipeline, are quantitatively and continuously conveyed to the material inlet 401 of the rotary crystallization dryer 4, and are continuously pushed back by the rotary direction stirring rods 416 on the stirring main shaft 415 in the cylinder 414. The temperatures in the front chamber jacket 405, the middle chamber jacket 406 and the rear chamber jacket 407 are adjusted to be at suitable crystallization gradient temperatures by controlling the front chamber jacket adjusting valve 9, the middle chamber jacket adjusting valve 10 and the rear chamber jacket adjusting valve 11, so that the water-containing PET chips in the rotary crystallization dryer 4 are heated.

[0023] As shown in Figure 3 The stirring main shaft 415 is provided with a plurality of unit rotary stirring rods 416, and 4 groups of stirring rods form a unit, the stirring rods are at an angle of 45°, and the stirring rods are spaced apart from the cylinder by 12 mm. The cold air generated by the air blower 5 is heated to the crystallization temperature of the PET chips by the electric heater 6, is sent to the hot air inlet 403 of the rotary crystallization dryer 4 through the pipeline, is contacted with the heated PET chips in the cylinder, and the flow of the hot air carries away the water on the surface of the PET chips, and finally is discharged from the hot air exhaust port 404 at the top of the discharge end of the rotary crystallization dryer 4. The residence time of the PET chips in the rotary crystallization dryer 4 is controlled by adjusting the feeding amount and the stirring speed, and the crystallization and drying of the PET chips are completed. The continuously crystallized and dried PET chips are fed into the finished product bin 8 through the material outlet 402 of the rotary crystallization dryer 4, the pipeline and the discharge rotary feeding valve 7, and then are packaged.

[0024] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; under the idea of the present application, the technical features in the above examples or different examples can also be combined, and there are many other changes of different aspects of the present application as described above; for the sake of simplicity, they are not provided in details; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A PET chip continuous crystallization apparatus, characterized by, The device comprises a vacuum suction machine, an intermediate bin, an inlet rotary feeding valve, a rotary crystallization dryer, an outlet rotary feeding valve and a finished product bin connected in sequence; the vacuum suction machine is used to transport the water-containing PET chips into the intermediate bin, the inlet rotary feeding valve is used to input the water-containing PET chips in the intermediate bin into the rotary crystallization dryer, the rotary crystallization dryer is used to heat and crystallize the water-containing PET chips, and the outlet rotary feeding valve is used to transport the finished product of the heated and crystallized PET chips into the finished product bin; the rotary crystallization dryer comprises a plurality of jackets for storing hot oil, and each jacket is respectively provided with a hot oil inlet and a hot oil outlet.

2. The PET chip continuous crystallization apparatus according to claim 1, wherein, The device further comprises an electric heater and a blower in sequence with the rotary crystallization dryer, the electric heater is used to heat the cold air generated by the blower and then deliver the heated air into the rotary crystallization dryer; the rotary crystallization dryer is provided with a corresponding hot air inlet and a hot air exhaust.

3. The PET chip continuous crystallization apparatus according to claim 1, wherein, The rotary crystallization dryer comprises a front chamber jacket, a middle chamber jacket and a rear chamber jacket; the front chamber jacket is provided with a front chamber jacket hot oil inlet and a front chamber jacket hot oil outlet, and a front chamber jacket adjusting valve is arranged on the pipeline of the front chamber jacket hot oil inlet; the middle chamber jacket is provided with a middle chamber jacket hot oil inlet and a middle chamber jacket hot oil outlet, and a middle chamber jacket adjusting valve is arranged on the pipeline of the middle chamber jacket hot oil inlet; the rear chamber jacket is provided with a rear chamber jacket hot oil inlet and a rear chamber jacket hot oil outlet, and a rear chamber jacket adjusting valve is arranged on the pipeline of the rear chamber jacket hot oil inlet.

4. The PET chip continuous crystallization apparatus according to claim 1, wherein, The rotary crystallization dryer comprises a barrel and a stirring main shaft located in the barrel; the barrel is provided with a material inlet and a material outlet at both ends respectively; and the stirring main shaft is provided with a plurality of stirring rods.

5. The PET chip continuous crystallization apparatus according to claim 4, wherein The stirring main shaft is provided with multiple units of stirring rods at intervals, and each unit contains four groups of stirring rods, and the included angle between the stirring rods in the same unit is 45°.

6. The PET chip continuous crystallization apparatus according to claim 4, wherein The distance between the outermost end of the stirring rod and the inner wall of the barrel is 12mm.

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