Novel drying machine for recycling and regenerating PET (Polyethylene Terephthalate)

Abstract

The utility model relates to the technical field of drying machines, in particular to a novel drying machine for recycling and regenerating PET (Polyethylene Terephthalate). A novel drying machine for recycling and regenerating PET comprises a preheating hopper, the upper portion of the preheating hopper is communicated with a material collector, the material collector is connected with a feeding machine, one side of the preheating hopper is communicated with a preheating box, the lower portion of the preheating hopper is communicated with a heating hopper, the lower portion of the heating hopper is connected with a material suction box, and the material suction box is connected with a first material collector through a connecting pipe. The lower portion of the first material collector is communicated with a vacuum hopper, the lower portion of the vacuum hopper is communicated with a main heat preservation hopper, vacuum isolation hoppers are arranged between the vacuum hopper and the first material collector and between the vacuum hopper and the main heat preservation hopper, and the lower portion of the main heat preservation hopper is connected with a metering, proportioning and mixing unit. The total drying time can be shortened from traditional 6-8 hours to 4 hours, the high-efficiency requirement for large-scale PET recycling and regeneration is met, the energy consumption is reduced, and different formulas can be rapidly switched.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drying machine technical field, concretely is a novel drying machine of recycling and regenerating PET. BACKGROUND

[0002] PET bottle is the biggest beverage packaging of using quantity today, and is widely used in food, chemical industry, medicine packaging and many other fields, and the PET bottle that China produces every year reaches several hundred billion, and more than 500,000 tons of PET is used for the manufacture of PET bottle every year, the recycling of PET bottle can not only solve the environmental protection problem, but also can be used as a new raw material resource, alleviate the contradiction of the shortage of PET raw material in China, and the material drying time of PET bottle is too long at present, usually needs more than 6 hours, plus other recycling and regenerating steps at least need more than 6~8 hours, the time consumption is too long, can not satisfy such big supply, and the production of PET needs more efficient drying. SUMMARY

[0003] The utility model provides a novel drying machine of recycling and regenerating PET for overcoming the insufficient prior art, the gas containing water is finally from the top of preheating hopper, is filtered again before discharging to the outside, can play the drying effect, removes any dust and particle, also can remove benzene and acetaldehyde.

[0004] To realize the above-mentioned purpose, a novel drying machine of recycling and regenerating PET, including preheating hopper, the preheating hopper is connected with the material collector, and the material collector is connected with the feeding machine, the preheating hopper side is connected with the preheating box, and the preheating hopper lower side is connected with the heating hopper, and the heating hopper lower side is connected with the suction box, and the suction box is connected with the material collector one through the connecting pipe, and the material collector lower side is connected with the vacuum hopper, and the vacuum hopper lower side is connected with the main heat preservation hopper, and the vacuum hopper is connected with the material collector one and the main heat preservation hopper, and the vacuum isolation hopper is arranged between the vacuum hopper and the material collector one and the main heat preservation hopper, and the main heat preservation hopper lower side is connected with the metering and proportioning mixing unit;

[0005] The preheating hopper side is connected with the preheating box, and the preheating box is connected with the preheating fan, and the preheating fan extracts air through the filter and sends into the preheating box, and the preheating hopper other side is also equipped with the filter one, and the heating hopper side is connected with the heating box, and the heating box is connected with the heating fan, and the heating fan extracts air in the heating hopper through the filter and sends into the heating box;

[0006] The vacuum hopper and the vacuum isolation hopper below are jointly connected with the vacuum pump, and the main hopper heating box is connected with the main hopper fan, and the main hopper fan is connected with the compressed air dryer.

[0007] The collector is connected in parallel with the interrupt valve, a ball valve is arranged between the collector one, the vacuum isolation hopper, the vacuum hopper and the main heat preservation hopper, and one end of the connecting pipe is connected with the pipe cleaning valve.

[0008] The preheating hopper, the heating hopper, the vacuum hopper and the main heat preservation hopper are all provided with pneumatic gate knives.

[0009] The preheating hopper and the heating hopper are provided with continuous material levels, and the vacuum hopper and the main heat preservation hopper are provided with capacitive material levels.

[0010] The motor driving modules of the preheating fan, the heating fan, the main hopper fan and the vacuum pump are respectively connected with the digital signal output end of the control unit, the contactors of the preheating box are respectively connected with the digital output end, the digital input end and the analog input end of the control unit, the frequency converters of the heating box are respectively connected with the digital output end, the digital input end and the analog output end of the control unit, the control heating groups of the main hopper heating box are respectively connected with the digital output end, the digital input end and the analog input end of the control unit, and the signal contactors of the compressed air dryer are connected with the digital output end, the digital input end and the analog input end of the control unit, wherein the control unit is S7-1200.

[0011] Compared with the prior art, the total drying time can be shortened from 6-8 hours to 2 hours of preheating, 1.5 hours of vacuum drying and 0.5 hours of main heat preservation, and the total time is about 4 hours, the content of benzene and acetaldehyde is significantly reduced, the energy consumption is reduced, the efficient demand of large-scale PET recycling is met, the energy consumption is greatly reduced, and different formulations can be quickly switched. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model.

[0013] Figure 2 It is a receiving and feeding structure.

[0014] Figure 3 It is a partial schematic view of a preheating hopper and a heating hopper.

[0015] Figure 4 It is a partial schematic view of a vacuum hopper and a main heat preservation hopper.

[0016] See Figures 1 to 41 is a preheating hopper, 2 is a heating hopper, 3 is a heating box, 4 is a preheating box, 5 is a preheating fan, 6 is a pneumatic guillotine, 7 is a heating fan, 8 is a connecting pipe, 9 is a feeding machine, 10 is a metering and proportioning mixing unit, 11 is a vacuum isolation hopper, 12 is a vacuum hopper, 13 is a suction box, 14 is a pipe cleaning valve, 15 is a main heat preservation hopper, 16 is a main hopper fan, 17 is a vacuum pump, 18 is a ball valve, 19 is a compressed air dryer, 20 is an interrupter valve, 21 is a main hopper heating box, 22 is a capacitive material level, 23 is a control unit, 24 is a filter, 24.1 is a filter one, 25 is a continuity material level, 26 is a material receiver, 26.1 is a material receiver one. DETAILED DESCRIPTION

[0017] The utility model will be further explained according to the drawings.

[0018] As Figure 1 shown, the preheating hopper 1 is communicated with the material receiver 26 at the top, as Figure 2 shown, the material receiver 26 is connected with the feeding machine 9, as Figure 3 、 4 shown, the preheating hopper 1 is communicated with the preheating box 4 at one side, and the preheating hopper 1 is communicated with the heating hopper 2 at the bottom, and the heating hopper 2 is connected with the suction box 13 at the bottom, and the suction box 13 is connected with the material receiver one 26.1 through the connecting pipe 8, and the material receiver one 26.1 has a heat preservation function, and the material receiver one 26.1 is communicated with the vacuum hopper 12 at the bottom, and the vacuum hopper 12 is communicated with the main heat preservation hopper 15 at the bottom, and the vacuum isolation hopper 11 is arranged between the vacuum hopper 12 and the material receiver one 26.1 and the main heat preservation hopper 15 to isolate them, and the vacuum isolation hopper 11 ensures the vacuum environment in the vacuum hopper 12, and the main heat preservation hopper 15 is connected with the metering and proportioning mixing unit 10 at the bottom.

[0019] The preheating hopper 1 is communicated with the preheating box 4 at one side, and the preheating box 4 is connected with the preheating fan 5, and the preheating fan 5 extracts air through the filter 24 and sends it into the preheating box 4, and the preheating hopper 1 is also provided with the filter one 24.1 at the other side, and the filter 24 is used to ensure that the air entering is impurity-free, and the filter one 24.1 separates the dust and particles generated inside, and the heating hopper 2 is communicated with the heating box 3 at one side, and the heating box 3 is connected with the heating fan 7, and the heating fan 7 extracts air in the heating hopper 2 through the filter 24 and sends it into the heating box 3.

[0020] The vacuum hopper 12 and the vacuum isolation hopper 11 below are jointly connected with the vacuum pump 17, and the vacuum pump 17 can separate the moisture, benzene and acetaldehyde in the recycled and regenerated PET in the vacuum hopper 12 by the way of extracting air, and the main heat preservation hopper 15 is connected with the main hopper heating box 21, and the main hopper heating box 21 is connected with the main hopper fan 16, and the main hopper fan 16 is connected with the compressed air dryer 19 outside.

[0021] The receiver 26 is connected in parallel with the interrupt valve 20, the interrupt valve 20 can control the opening and closing of the receiver 26, the receiver 26.1 is connected with the vacuum isolation hopper 11, the vacuum isolation hopper 11 and the vacuum hopper 12, the vacuum isolation hopper 11 and the main insulation hopper 15 through the ball valve 18, and the one end of the connecting pipe 8 is connected with the pipe cleaning valve 14.

[0022] The pneumatic knife 6 is arranged at the outlet of the preheating hopper 1, the heating hopper 2, the vacuum hopper 12 and the main insulation hopper 15, and is used for unloading and recycling the PET, the continuity material level 25 is arranged in the preheating hopper 1 and the heating hopper 2, and the capacitive material level 22 is arranged in the vacuum hopper 12 and the main insulation hopper 15.

[0023] The motor driving modules of the preheating fan 5, the heating fan 7, the main hopper fan 16 and the vacuum pump 17 are respectively connected with the digital signal output end of the control unit 23, the contactors of the preheating box 4 are respectively connected with the digital output end, the digital input end and the analog input end of the control unit 23, the frequency converters of the heating box 3 are respectively connected with the digital output end, the digital input end and the analog output end of the control unit 23, the control heating groups of the main hopper heating box 21 are respectively connected with the digital output end, the digital input end and the analog input end of the control unit 23, and the signal contactors of the compressed air dryer 19 are connected with the digital output end, the digital input end and the analog input end of the control unit 23, wherein the control unit 23 is of S7-1200 type.

[0024] The specific implementation process of the utility model is: the material collector 26 collects the recycled PET from the mixer, and transports it to the preheating hopper 1, and runs under open loop condition, the indoor air filtered by the filter 24 is drawn by the preheating fan 5 to the preheating box 4, the air is heated to the set process temperature 100 DEG C, the heated air is sent to the preheating hopper 1, and is transported from the bottom to the preheating hopper 1 through the heat dissipation cone at the bottom, so that it can reach all recycled PET contained in the preheating hopper 1, the hot air passes through the recycled PET and finally comes out from the top of the preheating hopper 1, and finally passes through the filter 24.1 before being discharged to the room, after separating dust and particles, the preheating hopper 1 bottom has a pneumatic gate knife 6 for unloading the recycled PET, the recycled PET is unloaded into the heating hopper 2, the circulating air drawn by the heating fan 7 reaches the heating box 3, where the air is heated to the process temperature 170 DEG C, the recycled PET in the heating hopper 2 is dried, the required moisture content of the recycled PET at this time is less than 1250 ppm, the benzene content is less than 65 ppb, and the acetaldehyde content is 1.2 ppm, the air returned to the heating hopper 2 passes through the filter 24 before reaching the heating fan 7, and is transported from the bottom to the heating hopper 2 through the heat dissipation cone at the bottom, so that it can reach all recycled PET contained in the heating hopper 2, after high-temperature heating and drying for 2 hours, the material collector 26.1 draws the recycled PET from the bottom of the heating hopper 2, enters the vacuum hopper 12 after passing through the vacuum isolation hopper 11 and the ball valve 18, the vacuum pump 17 draws the vacuum hopper 12 into vacuum, the recycled PET is dried and the benzene and acetaldehyde therein are removed, after 1.5 hours, the dried recycled PET flows into the main insulation hopper 15 through the vacuum isolation hopper 11 and the ball valve 18, in this process, the moisture content of the recycled PET needs to be less than 1250 ppm, the benzene content is less than 65 ppb, and the acetaldehyde content is 1.2 ppm, the main hopper fan 16 draws the dried air from the compressed air dryer 19, and is heated to the set process temperature 170 DEG C in the main hopper heating box 21, the recycled PET is heated again in the main insulation hopper 15 due to heat loss after vacuumizing, the hot air contacts the recycled PET and finally circulates to the main hopper fan 16 from the top of the main insulation hopper 15 through the filter 24, and the drying is completed after 2 hours, at this time, the whole drying system is completed, the recycled PET is directly transported to the injection molding machine or the extruder, after the whole process is completed, the moisture content of the dried recycled PET is less than 40 ppm, the benzene content is less than 10 ppb, and the acetaldehyde content is less than 1 ppm.

Claims

1. A novel dryer for recycling of PET, comprising a preheating hopper, characterized in that: The preheating hopper (1) is communicated with a material collector (26) above, the material collector (26) is connected with a feeding machine (9), a preheating box (4) is communicated with one side of the preheating hopper (1), a heating hopper (2) is communicated with the lower side of the preheating hopper (1), a material suction box (13) is connected below the heating hopper (2), the material suction box (13) is communicated with a material collector (26.1) through a connecting pipe (8), a vacuum hopper (12) is communicated below the material collector (26.1), a main heat preservation hopper (15) is communicated below the vacuum hopper (12), a vacuum isolation hopper (11) is arranged between the vacuum hopper (12) and the material collector (26.1) and the main heat preservation hopper (15), and a metering and proportioning mixing unit (10) is connected below the main heat preservation hopper (15). The preheating hopper (1) is communicated with a preheating box (4) on one side, the preheating box (4) is connected with a preheating fan (5), air is extracted through a filter (24) and sent into the preheating box (4) by the preheating fan (5), and a filter (24.1) is further arranged on the other side of the preheating hopper (1); a heating box (3) is communicated with one side of the heating hopper (2), the heating box (3) is connected with a heating fan (7), and air in the heating hopper (2) is extracted through the filter (24) and then sent into the heating box (3) by the heating fan (7). The vacuum hopper (12) and the vacuum isolation hopper (11) below are jointly connected with a vacuum pump (17), the main heat preservation hopper (15) is connected with a main hopper heating box (21), the main hopper heating box (21) is connected with a main hopper fan (16), and the main hopper fan (16) is connected with a compressed air dryer (19) outside.

2. A novel dryer for recycling of PET as claimed in claim 1, wherein: The material collector (26) is connected in parallel with a stop valve (20), the material collector (26.1) is connected with the vacuum isolation hopper (11), a ball valve (18) is arranged between the vacuum isolation hopper (11) and the vacuum hopper (12) and the vacuum isolation hopper (11) and the main heat preservation hopper (15), and one end of the connecting pipe (8) is connected with a pipe cleaning valve (14).

3. A novel dryer for recycling of PET as claimed in claim 1, wherein: The preheating hopper (1), the heating hopper (2), the vacuum hopper (12) and the main heat preservation hopper (15) are all provided with pneumatic gate knives (6) at the outlets.

4. A novel dryer for recycling of PET as claimed in claim 1, wherein: The preheating hopper (1) and the heating hopper (2) are provided with continuous material levels (25), and the vacuum hopper (12) and the main heat preservation hopper (15) are provided with capacitive material levels (22).

5. A novel dryer for recycling of PET as claimed in claim 1, wherein: The motor drive modules of the preheating fan (5), the heating fan (7), the main hopper fan (16) and the vacuum pump (17) are respectively connected to the digital signal output end of the control unit (23), the contactors of the preheating box (4) are respectively connected to the digital output end, the digital input end and the analog input end of the control unit (23), the frequency converters of the heating box (3) are respectively connected to the digital output end, the digital input end and the analog output end of the control unit (23), the control heating groups of the main hopper heating box (21) are respectively connected to the digital output end, the digital input end and the analog input end of the control unit (23), and the signal contactor of the compressed air dryer (19) is connected to the digital output end, the digital input end and the analog input end of the control unit (23), wherein the control unit (23) is of S7-1200 type.

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