PET bottle flake drying and purifying device

Abstract

The utility model discloses a PET bottle flake drying and purifying device which comprises a continuous infrared drying machine and a purifying machine, the continuous infrared drying machine comprises a fixed machine base and a charging barrel, a discharging opening is formed in the downstream end of the charging barrel, a discharging bin is arranged on the fixed machine base, an infrared lamp box for heating the interior of the charging barrel is further installed on the fixed machine base, and the purifying machine is arranged on the fixed machine base. The purifying machine comprises a purifying cylinder, a feeding port is formed in the upper end of the purifying cylinder and communicated with a discharging bin through a bottle chip conveying device, the lower end of the purifying cylinder is connected with a conical discharging hopper facilitating discharging, and the lower portion of the discharging hopper is open and connected with a discharging control device. A main nitrogen gas port is formed in the discharging hopper and communicates with a hot nitrogen gas supply system, and a negative pressure gas extractor is arranged at the top of the purification cylinder. According to the drying and purifying device, the PET bottle chips can be rapidly dried and purified, the drying and purifying time is shortened, and meanwhile the purifying effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of PET recycling, in particular to a PET bottle flake drying and purification device. Background Art

[0002] In the PET bottle recycling industry, crushed and cleaned PET bottle flakes need to be dehydrated and dried. Currently, PET bottle drying is mainly done by hot air drying. For example, the invention application disclosed as CN116728645A describes a vertical lifting and screening drying device. This screening drying device uses a spiral disk for lifting and conveying, and heated air is introduced into a drying pipe for heating, thereby achieving drying. However, this drying device still has the following disadvantages: 1. This drying efficiency is very low. The hot air drying method has a slow temperature rise and a long drying time, and the moisture content of the dried PET bottle flakes is still relatively high. 2. The small particles of the drying device need to fall through the screening vents on the spiral disk. However, since a large number of bottle flakes are stored inside the spiral disk, the bottle flakes may clog or block the screening vents. Therefore, the method of dropping by dead weight is not reliable. 3. The drying device uses hot air to dry the bottle flakes, but they are not isolated from oxygen during drying, resulting in a yellow color of the dried PET bottle flakes. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a PET bottle flake drying and purification device, which can quickly dry and purify PET bottle flakes, shorten the drying and purification time, and achieve better purification effect.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a PET bottle flake drying and purification device, including a continuous infrared dryer and a purifier, the continuous infrared dryer includes a fixed machine base, a barrel is rotatably mounted on the fixed machine base, the upstream end of the barrel is provided with a feed port, a feeding device is installed on the fixed machine base, a discharge port is provided at the downstream end of the barrel, a spiral stirring blade is provided in the barrel, the barrel is driven by a rotating power device, and a screw thread connected to the discharge port is provided on the fixed machine base. The discharge bin is provided with an infrared light box and an exhaust device for heating the inside of the barrel. The purifier includes a purification cylinder. The upper end of the purification cylinder is provided with a feeding port. The feeding port is connected to the discharge bin through a bottle piece conveying device. The lower end of the purification cylinder is connected to a conical discharge hopper for convenient discharge. The lower end of the discharge hopper is opened and connected to a discharge control device. A nitrogen total gas port is provided on the discharge hopper. The nitrogen total gas port is connected to the hot nitrogen supply system. A negative pressure exhaust device is provided on the top of the purification cylinder.

[0005] As a preferred solution, the discharge hopper includes an inner hopper, an intermediate hopper and an outer hopper from the inside to the outside, and the inner hopper, the intermediate hopper and the outer hopper are fixedly connected by an annular connecting plate. The outer hopper is provided with the nitrogen total gas port, an outer annular chamber is provided between the outer hopper and the intermediate hopper, and an inner annular chamber is formed between the intermediate hopper and the inner hopper. The nitrogen total gas port is communicated with the outer annular chamber, and the upper and lower parts of the outer annular chamber and the inner annular chamber are respectively communicated, a communicating hole is provided on the annular connecting plate, and a plurality of air inlet holes are also provided on the hopper wall of the inner hopper.

[0006] As a preferred solution, the outside of the purification cylinder and the outside of the outer hopper are both provided with a heat-insulating layer, and an auxiliary heating device for auxiliary heating of the purification cylinder is also provided in the heat-insulating layer.

[0007] As a preferred solution, the upper and lower parts of the outer annular chamber and the inner annular chamber are respectively connected by an upper connecting chamber and a lower connecting chamber, the upper connecting chamber is formed between the upper parts of the outer hopper and the inner hopper, and the lower connecting chamber is formed between the lower parts of the outer hopper and the inner hopper.

[0008] As a preferred solution, the bottle chip conveying device is a vacuum loader, which includes a vacuum loader hopper fixed on the top of the purification cylinder, the feed port of the vacuum hopper and the outlet of the discharge bin are connected through a material conveying pipe, the air exhaust port of the vacuum hopper is connected to the loading suction fan, the discharge bin is a closed silo with a valve, and the discharge bin or the material conveying pipe is connected to the outlet of the hot nitrogen supply system.

[0009] As a preferred solution, the negative pressure exhaust device includes an air suction hood fixed on the top of the purification cylinder, the air suction hood is connected to the exhaust fan, and the air outlet of the exhaust fan is connected to the hot nitrogen supply system through the nitrogen recovery system.

[0010] As a preferred solution, the purification cylinder is provided with a negative pressure vacuum gauge, a thermometer and a sight glass.

[0011] After adopting the above technical solution, the effect of the utility model is as follows: since the PET bottle flake drying and purification device includes a continuous infrared dryer and a purifier, the continuous infrared dryer includes a fixed machine base, a barrel is rotatably mounted on the fixed machine base, the upstream end of the barrel is provided with a feed port, a feeding device is installed on the fixed machine base, a discharge port is provided at the downstream end of the barrel, a spiral stirring blade is provided in the barrel, the barrel is driven by a rotating power device, and the fixed machine base is provided with a discharge port. The discharge bin is connected to the material port, and the fixed machine base is also equipped with an infrared light box and an exhaust device for heating the inside of the barrel. The purifier includes a purification cylinder, the upper end of the purification cylinder is provided with a feeding port, and the feeding port is connected to the discharge bin through a bottle piece conveying device. The lower end of the purification cylinder is connected to a conical discharge hopper for convenient discharge, and the lower end of the discharge hopper is opened and connected to a discharge control device. A nitrogen total gas port is provided on the discharge hopper, and the nitrogen total gas port is connected to the hot nitrogen gas supply system. A negative pressure exhaust device is provided at the top. Therefore, the drying and purification device has at least the following advantages over the background technology: 1. The drying and purification device adopts a continuous infrared dryer to transport and dry the PET bottle flakes first. During the drying process, an infrared lamp box is used for heating and drying. In addition, the PET bottle flakes will be stirred by spiral stirring blades during the transportation process, which has a better heating effect, a faster temperature rise, and shortens the drying time. The dried PET bottles are sent to the purification cylinder, and are dried and purified again in the purification cylinder using heated nitrogen. Due to the introduction of hot nitrogen, the low molecular impurities and moisture in the PET bottle flakes will volatilize. At the same time, the negative pressure exhaust at the top of the purification cylinder can extract these impurities and moisture. Of course, some broken small particles can also be extracted. Therefore, the drying and purification device first uses infrared heating to dry, and then uses nitrogen protection to dry and purify, minimizing the contact between the PET bottle flakes and oxygen, performing heating, drying and purification, with higher drying and purification efficiency, shorter drying and purification time, and the purified PET bottle flakes are less likely to change color.

[0012] Furthermore, since the discharging hopper includes an inner hopper, an intermediate hopper and an outer hopper from the inside to the outside, the inner hopper, the intermediate hopper and the outer hopper are fixedly connected by an annular connecting plate, the outer hopper is provided with the nitrogen total gas port, an outer annular chamber is provided between the outer hopper and the intermediate hopper, an inner annular chamber is formed between the intermediate hopper and the inner hopper, the nitrogen total gas port is communicated with the outer annular chamber, the outer annular chamber and the upper and lower parts of the inner annular chamber are communicated respectively, a communicating hole is provided on the annular connecting plate, and a plurality of air inlet holes are also provided on the hopper wall of the inner hopper. The discharging hopper can disperse the nitrogen from the upper and lower ends and then enter the inner annular chamber, and then enter the inner hopper through the air inlet holes to heat the material. There is no dead angle when the nitrogen enters, and the heating is more uniform, avoiding the situation where the nitrogen enters concentratedly and causes local excessive temperature.

[0013] Since the outside of the purification cylinder and the outside of the outer hopper are both provided with an insulation layer, an auxiliary heating device for auxiliary heating of the purification cylinder is also provided in the insulation layer. The insulation layer can reduce heat loss. At the same time, the auxiliary heating device can be used to supplement heat when the nitrogen temperature is insufficient. The auxiliary heating device can be heated by electricity or thermal oil.

[0014] Furthermore, since the bottle flake conveying device is a vacuum loader, the vacuum loader includes a vacuum hopper fixed on the top of the purification cylinder, the feed port of the vacuum hopper is connected to the outlet of the discharge bin through a material conveying pipe, the air exhaust port of the vacuum hopper is connected to the feeding suction fan, the discharge bin is a closed silo with a valve, and the discharge bin or the material conveying pipe is connected to the outlet of the hot nitrogen supply system. The bottle flake conveying device also performs hot nitrogen protection during the process of conveying PET bottle flakes, further reducing contact with oxygen, and minimizing heat loss of the PET bottle flakes during transportation in the material conveying pipe, thereby improving the utilization rate of thermal energy.

[0015] Furthermore, since the negative pressure exhaust device includes an air suction hood fixed on the top of the purification cylinder, the air suction hood is connected to the exhaust fan, and the air outlet of the exhaust fan is connected to the hot nitrogen supply system through the nitrogen recovery system, the air suction hood can increase the suction area, and the nitrogen recovery system can recover and utilize the nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 It is a structural diagram of a continuous infrared dryer;

[0019] Figure 3 It is a structural diagram of the purifier;

[0020] Figure 4 It is a cross-sectional view of the purifier;

[0021] Figure 5 It is a partial schematic diagram of the discharge hopper;

[0022] In the accompanying drawings: 1. Continuous infrared dryer; 11. Feeding device; 12. Cylinder; 13. Infrared light box; 14. Rotary power device; 15. Discharge bin; 16. Fixed base; 17. Spiral stirring blade; 2. Purifier; 21. Purification cylinder; 22. Discharge hopper; 221. Outer hopper; 222. Intermediate hopper; 223. Inner hopper; 224. Outer annular chamber; 225. Inner annular chamber; 226. Lower connecting chamber; 227. Upper connecting chamber chamber; 228, annular connecting plate; 229, air inlet; 23, suction hood; 24, nitrogen main air port; 25, discharge control device; 251, buffer bin; 252, pneumatic butterfly valve; 26, insulation layer; 27, material level meter; 28, negative pressure vacuum gauge; 29, thermometer; 210, sight glass; 3, hot nitrogen gas supply system; 4, bottle flake conveying device; 41, feeding suction fan; 42, material conveying pipeline; 43, vacuum feeding hopper; 5, exhaust fan. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below through specific embodiments.

[0024] like Figures 1 to 5 As shown, a PET bottle flake drying and purification device includes a continuous infrared dryer 1 and a purifier 2, as shown in FIG. Figure 2 As shown, the continuous infrared dryer 1 includes a fixed machine base 16, on which a barrel 12 is rotatably mounted, a feed port is provided at the upstream end of the barrel 12, and a feeding device 11 is mounted on the fixed machine base 16, wherein the feeding device 11 includes a feeding hopper, and the feeding hopper is also connected to a vacuum loader for loading PET bottle flakes.

[0025] A discharge port is provided at the downstream end of the barrel 12, and a spiral stirring blade 17 is provided inside the barrel 12. The barrel 12 is driven by a rotary power device 14, which can drive the barrel 12 to rotate. The rotary power device 14 includes a motor and a support roller group supporting the outside of the barrel 12. The motor drives the support roller group to rotate to drive the barrel 12 to rotate. When the barrel 12 rotates, the internal spiral stirring blade 17 stirs the material while also transporting the material from the feed port to the discharge port.

[0026] The fixed machine base 16 is provided with a discharge bin 15 connected to the discharge port. The discharge bin 15 is preferably a closable discharge bin 15. A valve is provided on the discharge bin 15 to open or close the discharge port. In this way, in conjunction with subsequent nitrogen protection, the contact between PET bottle flakes and oxygen can be avoided as much as possible.

[0027] An infrared light box 13 for heating the inside of the barrel 12 is also installed on the fixed machine base 16. The infrared light box 13 can be used to perform infrared heating on the material in the barrel 12, which can play a role in sterilization and drying. The purifier 2 includes a purification cylinder 21. The upper end of the purification cylinder 21 is provided with a feeding port. The feeding port is connected to the discharge bin 15 through a bottle piece conveying device 4. The lower end of the purification cylinder 21 is connected to a conical discharge hopper 22 for convenient discharge. The lower end of the discharge hopper 22 is opened and connected to a discharge control device 25. A nitrogen total gas port 24 is provided on the discharge hopper 22. The nitrogen total gas port 24 is connected to the hot nitrogen supply system 3. The top of the purification cylinder 21 is provided with a negative pressure exhaust device.

[0028] The discharge control device 25 includes a buffer bin 251 , which is fixed to the lower opening of the discharge hopper 22 and is opened and closed by a pneumatic butterfly valve 252 .

[0029] In this embodiment, Figure 4 and Figure 5 As shown, the discharge hopper 22 includes an inner hopper 223, an intermediate hopper 222 and an outer hopper 221 from the inside out. The inner hopper 223, the intermediate hopper 222 and the outer hopper 221 are fixedly connected by an annular connecting plate 228. The outer hopper 221 is provided with the nitrogen total gas port 24. An outer annular chamber 224 is provided between the outer hopper 221 and the intermediate hopper 222. An inner annular chamber 225 is formed between the intermediate hopper 222 and the inner hopper 223. The nitrogen total gas port 24 is in communication with the outer annular chamber 224. The upper and lower parts of the outer annular chamber 224 and the inner annular chamber 225 are respectively in communication. A connecting hole is provided on the annular connecting plate 228. A plurality of air inlet holes 229 are also provided on the hopper wall of the inner hopper 223. The connecting holes on the annular connecting plate 228 facilitate the passage of nitrogen.

[0030] The outside of the purification cylinder 21 and the outside of the outer hopper 221 are both provided with an insulation layer 26. An auxiliary heating device for auxiliary heating of the purification cylinder 21 is also provided in the insulation layer 26. The insulation layer 26 is insulated with insulation cotton, and the auxiliary heating device can be heated by an electric heating device or thermal oil. When an abnormal situation occurs and the temperature of the nitrogen is too low, the auxiliary heating device can be turned on for auxiliary heating.

[0031] The negative pressure exhaust device includes an air suction hood 23 fixed to the top of the purification cylinder 21. The air suction hood 23 is connected to the exhaust fan 5. The air outlet of the exhaust fan 5 is connected to the hot nitrogen supply system 3 through the nitrogen recovery system. The purification cylinder 21 is equipped with a negative pressure vacuum gauge 28, a thermometer 29, and a sight glass 210. The upper portion of the purification cylinder 21 is also equipped with a material level meter 27.

[0032] The nitrogen recovery system in this embodiment may mainly include a filter and a nitrogen recovery pipe. The nitrogen is filtered through the filter during recovery and then reused.

[0033] The upper and lower parts of the outer annular chamber 224 and the inner annular chamber 225 are respectively connected by an upper communicating chamber 227 and a lower communicating chamber 226. The upper communicating chamber 227 is formed between the upper part of the outer hopper 221 and the inner hopper 223, and the lower communicating chamber 226 is formed between the lower part of the outer hopper 221 and the inner hopper 223. Figure 5 As shown, after the heated nitrogen enters the outer annular chamber 224, it will flow upward and downward, then pass through the upper connecting chamber 227 and the lower connecting chamber 226, and then enter the inner annular chamber 225, and then enter from the air inlet 229. In this way, when the nitrogen enters, it will enter from all the air inlet holes 229 within the range of the inner annular chamber 225, and the air intake will be more uniform, and the heating will also be more uniform, especially the air will also enter from the bottom, thereby avoiding heating dead corners.

[0034] like Figure 1 and Figure 3 As shown, the bottle chip conveying device 4 is a vacuum loader, which includes a vacuum hopper 43 fixed on the top of the purification cylinder 21. The feed port of the vacuum hopper 43 is connected to the outlet of the discharge bin 15 through a material conveying pipe 42. The air suction port of the vacuum hopper 43 is connected to the feeding suction fan 41. The discharge bin 15 is a closed silo with a valve. The discharge bin 15 or the material conveying pipe 42 is connected to the outlet of the hot nitrogen supply system 3.

[0035] In this way, when the feeding exhaust fan 5 is exhausting and feeding, the valve of the silo closes the discharge port of the barrel 12. When the air is exhausted, a negative pressure is formed in the material conveying pipe 42. The PET bottle flakes in the discharge silo 15 are sucked into the vacuum hopper 43 by the action of the negative pressure, and the hot nitrogen supply system 3 replenishes hot nitrogen to prevent the PET bottle flakes from coming into contact with oxygen.

[0036] The air circuit system, actuators such as servo motors, gear transmission mechanisms, and screw-nut mechanisms mentioned in this embodiment are all conventional technologies. The specific structures and principles of the air cylinder, motor, and other transmission mechanisms, as well as other designs, are detailed in the "Mechanical Design Manual, Fifth Edition," the 28th edition, published in Beijing in April 2008. These are prior art and their structures are clear. The SMC training material "Modern Practical Pneumatic Technology, 3rd Edition," published by the Machinery Industry Press on August 1, 2008, details vacuum components, gas circuits, and program control, demonstrating that the air circuit structure in this embodiment is also prior art and clear. The book "Motor Drive and Speed ​​Regulation," published by the Chemical Industry Press on July 1, 2015, also provides detailed descriptions of motor control and travel switches. Therefore, the circuits and air circuit connections are clear. The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and alterations to the technical solution of the present invention, without departing from the spirit of the present invention, should fall within the scope of protection defined by the claims.

Claims

1. A PET bottle flake drying and purification device, characterized by: The invention also provides a novel material dispensing system, and the material dispensing device is installed on the fixed base, and the material dispensing device is installed on the fixed base, and the material dispensing device is installed on the downstream end of the material dispensing device. The material dispensing device is installed on the fixed base, and the material dispensing device is installed on the downstream end of the material dispensing device. The material dispensing device is installed on the fixed base, and the material dispensing device is installed on the downstream end of the material dispensing device. The material dispensing device is installed on the fixed base, and the material dispensing device is installed on the fixed base. The material dispensing device is installed on the fixed base. The material dispensing device is installed on the fixed base. The material dispensing device is installed on the fixed base. The material dispensing device is installed on the fixed base. The material dispensing device is installed on the fixed base.

2. The PET bottle flake drying and purification device according to claim 1, characterized in that: The discharge hopper includes an inner hopper, an intermediate hopper and an outer hopper from the inside to the outside. The inner hopper, the intermediate hopper and the outer hopper are fixedly connected by an annular connecting plate. The outer hopper is provided with the nitrogen total gas port. An outer annular chamber is provided between the outer hopper and the intermediate hopper. An inner annular chamber is formed between the intermediate hopper and the inner hopper. The nitrogen total gas port is communicated with the outer annular chamber. The upper and lower parts of the outer annular chamber are communicated with each other respectively. A communicating hole is provided on the annular connecting plate. A plurality of air inlet holes are also provided on the hopper wall of the inner hopper.

3. The PET bottle flake drying and purification device according to claim 2, characterized in that: The outside of the purification cylinder and the outside of the outer hopper are both provided with a heat-insulating layer, and an auxiliary heating device for auxiliary heating of the purification cylinder is also provided in the heat-insulating layer.

4. A PET bottle flake drying and purification device according to claim 3, characterized in that: The upper and lower parts of the outer annular chamber and the inner annular chamber are respectively connected by an upper communicating chamber and a lower communicating chamber. The upper communicating chamber is formed between the upper parts of the outer hopper and the inner hopper, and the lower communicating chamber is formed between the lower parts of the outer hopper and the inner hopper.

5. The PET bottle flake drying and purification device according to claim 4, characterized in that: The bottle chip conveying device is a vacuum loader, which includes a vacuum hopper fixed on the top of the purification cylinder. The feed port of the vacuum hopper is connected to the outlet of the discharge bin through a material conveying pipeline. The air exhaust port of the vacuum hopper is connected to the feeding suction fan. The discharge bin is a closed silo with a valve. The discharge bin or the material conveying pipeline is connected to the outlet of the hot nitrogen supply system.

6. The PET bottle flake drying and purification device according to claim 5, characterized in that: The negative pressure exhaust device includes an air suction hood fixed on the top of the purification cylinder, the air suction hood is connected to the exhaust fan, and the air outlet of the exhaust fan is connected to the hot nitrogen supply system through the nitrogen recovery system.

7. The PET bottle flake drying and purification device according to claim 6, characterized in that: The purification cylinder is provided with a negative pressure vacuum gauge, a thermometer and a sight glass.

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