TWI879079B - Low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment - Google Patents

Abstract

A low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment comprises a mixing device, a reaction device, a reaction kneading and conveying device and an underwater pelletizing device connected to each other. The mixing device comprises a first feed head and a mixing container. The first feed head is connected to a plurality of first storage barrels for storing and outputting plastic pellet raw materials. A pair of mixing screws is arranged in the mixing container, the reaction device is provided with a pair of reaction screws, and the reaction kneading and conveying device is provided with a pair of reaction kneading and conveying screws. Thus, in the mixing, reaction, reaction kneading and conveying process of the plastic pellet raw material mixture of the present invention, the emission of volatile organic compounds (VOC) is greatly reduced through a closed feeding environment, environmental pollution is avoided, and the effect of environmental protection is achieved.

Description

Low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment

The present invention relates to a polyurethane plastic pellet manufacturing device, and in particular to a low VOC emission and environmentally friendly polyurethane plastic pellet manufacturing device.

According to the commonly used polyurethane plastic pellet manufacturing equipment, please refer to the Republic of China patent application No. 103140388 "Compound plastic pellet manufacturing mechanism", which includes a shot mixing device, the shot mixing device is connected to a feeding device, the feeding device is connected to a kneading reaction device, the kneading reaction device is connected to a reaction escort device, and the reaction escort device is connected to a cooling device. By this, the present invention can independently adjust the motor torque of each device, and can achieve the effect of independently adjusting material mixing, reaction and mixing, and further improve the quality and output of the plastic pellets of the present invention, so as to achieve the effect of energy saving and carbon reduction.

However, the injection mixing head of the injection mixing device of the conventional composite plastic pellet manufacturing mechanism is connected to the storage barrel in an open manner, that is, when the storage barrel outputs the plastic pellet raw materials to the injection mixing head and when the plastic pellet raw materials are mixed, volatile organic compounds (VOC) will be generated and discharged to the outside, thereby causing air pollution and not environmentally friendly. Therefore, after observing the above shortcomings, the inventor of this case believes that the existing polyurethane plastic pellet manufacturing equipment needs to be improved, and thus the present invention is produced.

The purpose of this invention is to provide a low VOC emission and environmentally friendly polyurethane plastic pellet manufacturing equipment, which can significantly reduce the emission of volatile organic compounds (VOCs), avoid environmental pollution, and achieve environmental protection effects.

To achieve the above-mentioned purpose, the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment provided by the present invention comprises: a mixing device, which comprises a first motor, a first feed head and a mixing container which are connected to each other in a sealed manner, wherein the first feed head has a feed chamber, and the first feed head is connected to a plurality of first storage barrels, wherein the first storage barrels are used to store plastic pellet raw materials and can be metered and output to the feed chamber, and the mixing container A mixing chamber connected to the feeding chamber is formed in the body, and a pair of mixing screws parallel to each other are arranged in the mixing chamber, and the mixing screws are connected to the first motor to mix the plastic pellet raw materials into a plastic pellet raw material mixture; a reaction device, which includes a reaction container, a reaction chamber connected to the mixing device is formed in the reaction container, and a second motor is arranged at one end of the reaction container, and the second motor is connected to a pair of parallel reaction screws, which are arranged in the reaction chamber and can be driven by the second motor to react and output the plastic pellet raw material mixture; a reaction kneading and conveying device, which includes a reaction kneading and conveying container, a reaction kneading and conveying chamber connected to the reaction device is formed in the reaction kneading and conveying container, and a third motor is provided at one end of the reaction kneading and conveying container, and the third motor is connected to the reaction kneading and conveying chamber. A pair of parallel reaction kneading and conveying screws are connected, and the reaction kneading and conveying screws are arranged in the reaction kneading and conveying chamber, and can be driven by the third motor to react knead and convey the plastic pellet raw material mixture and then output it; an underwater pelletizing device is connected to the reaction kneading and conveying device, which is used to receive the plastic pellet raw material mixture output from the reaction kneading and conveying device, and cools and shapes the plastic pellet raw material mixture and cuts it into a plurality of plastic pellets.

The low VOC emission and environmentally friendly polyurethane plastic pellet manufacturing equipment provided by the present invention uses a closed feeding environment to significantly reduce the emission of volatile organic compounds (VOCs), avoid environmental pollution, and achieve environmental protection effects.

100: Low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment

10: Mixing device

11: First Motor

12: First feeding head

121: Feeding chamber

122: Feeding hole

123: First storage tank

13: Mixed container

131: Mixing chamber

132: Mixed export

14: Mixing screw

15: First discharge valve

151: Feed hole

152: Discharge channel

153: Hydraulic cylinder

20:Reaction device

21: Reaction container

211: Reaction chamber

212: Reaction entrance

213: Feeding port

215: Reaction exit

22: Second Motor

23: First gear box

24: Reaction screw

25: Second discharge valve

251: Feeding hole

252: Discharge channel

253: Hydraulic cylinder

26: Second feeding head

261: Perforation

262: screw hole

263: Inlet channel

264: Closed item

265: Pull rod

266: Plug

267: Elasticity Department

268:Connection

27: Knob

271: Stopping Department

272: Elastic parts

28: Pump

29: Second storage tank

30: Reaction kneading and escorting device

31: Reaction kneading and escorting container

311: Reaction kneading escort chamber

312: Reaction pinching escort entrance

313: Reaction kneading escort exit

32: The third motor

33: Second gear box

34: Reaction kneading conveyor screw

35: The third discharge valve

36: Melt pump

37: Double-drum screen changer

371: Filter

38: The fourth discharge valve

40: underwater pelletizing device

41: Die head

411:Mold hole

42: Cutting device

421: Blade

422: Motor

43: Cooling device

50: Crystallization device

51: Crystallization channel

60: Dehydration device

61: Outer cover

62: Feeding port

63: Discharge port

64: Grain storage tank

65: Motor

66: Shaft

67: Feeding plate

68: Filter

69: Sink

70: Drying device

71: Vacuum suction machine

711: Cavity

712: Suction pipe

713: Discharge port

72: Drying and humidifying machine

721: Molecular sieve dehumidification wheel

722: Exhaust duct

723:Suction pipe

Figure 1 is a schematic diagram of a combination of the preferred embodiments of the present invention.

Figure 2 is a combined cross-sectional view of a preferred embodiment of the present invention.

Figure 3 is a cross-sectional view of the first feed head.

Figure 4 is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the feeding state of the first discharge valve.

Figure 5 is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the discharging state of the first discharging valve.

Figure 6 is a cross-sectional view of the second feed head of the present invention.

Figure 7 is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the feeding state of the second feed head.

Figure 8 is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the material delivery state of the second discharge valve.

Figure 9 is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the discharge state of the second discharge valve.

Figure 10 is a schematic diagram of a preferred embodiment of the present invention, used to show the state of the underwater pelletizing device, crystallization device, dehydration device and drying device.

Please refer to Figures 1 and 2, which are combined schematic diagrams and combined cross-sectional diagrams of the preferred embodiment of the present invention, which disclose a low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment 100, which includes:

A mixing device 10 includes a first motor 11, at least one first feed head 12 and a mixing container 13 which are connected to each other, and the first motor 11, the first feed head 12 and the mixing container 13 are connected in a sealed manner to prevent the volatile organic compounds (VOC) generated during the mixing reaction from being discharged to the outside, thereby avoiding air pollution and being environmentally unfriendly. Please refer to FIG. 3 , wherein the first feed head 12 has a feed chamber 121, and the peripheral wall of the first feed head 12 is penetrated with a plurality of feed holes 122, and the feed holes 122 are connected to the feed chamber 121, and the feed holes 122 are respectively connected to at least one first storage barrel 123 in a sealed manner, such as a locking or screwing manner, and the first storage barrels 123 are used to store a plurality of different plastic pellets. The first storage barrels 123 are respectively equipped with an isocyanate polymer containing NCO, a hydroxyl compound containing OH and a short chain extender, and meter the output. In the embodiment of the present invention, the number of the first feed heads 12 is 1 to 2 and they are stacked up and down. Each first feed head 12 can be connected to 1 to 5 first storage barrels 123, and the number of the first storage barrels 123 is 1 to 10, wherein, in another preferred embodiment of the present invention, the first storage barrels 123 are respectively equipped with an isocyanate polymer containing NCO, a hydroxy compound containing OH and a short chain extender, diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), polyether polyol (Polyether polyol), polyester polyol (polyester polyol), 1,4-butanediol (1,4-BDO or BDO), 1.5MPD 3-methyl-1,5-pentanediol (1.5MPD), 1,6-hexanediol (1,6HD), hydroquinone bis (2-hydroxyethyl) ether (HQEE), UV-resistant agent, heat-resistant agent, antioxidant, promoter or environmentally friendly plasticizer, or a combination thereof, and can be metered and output to the feed chamber 121. The mixing container 13 is formed with a mixing chamber 131 and a mixing outlet 132 connected to the mixing chamber 131. The mixing chamber One end of the mixing chamber 131 is connected to the feeding chamber 121 for receiving the plastic pellet raw materials. A pair of mixing screws 14 are arranged in parallel with each other in the mixing chamber 131. The mixing screws 14 extend to the feeding chamber 121 and are connected to the first motor 11 to mix the plastic pellet raw materials into a plastic pellet raw material mixture. The mixing outlet 132 is located at the other end of the mixing chamber 131 and can output the plastic pellet raw material mixture. The mixing device 10 is located near the mixing outlet. A first discharge valve 15 is provided at the position of the port 132. The first discharge valve 15 is in the shape of a column, a plate or a strip and is radially penetrated through the outer wall of the mixing container 13. The first discharge valve 15 has a material delivery hole 151 and a discharge flow channel 152. The first discharge valve 15 is connected to a hydraulic cylinder 153 on the outer wall of the mixing container 13 to drive the first discharge valve 15. When the first discharge valve 15 is in the first position as shown in FIG. 4, the The two ends of the material delivery hole 151 are respectively connected to the mixing chamber 131 and the mixing outlet 132, so that the mixing outlet 132 can output the plastic pellet raw material mixture. When the first discharge valve 15 is in the second position as shown in Figure 5, the mixing chamber 131 is connected to the discharge flow channel 152, so that the discharge flow channel 152 can output the plastic pellet raw material mixture and receive the plastic pellet raw material mixture through a container (not shown) to confirm the quality of the plastic pellet raw material mixture.

A reaction device 20 is connected to the mixing device 10 in a sealed manner and includes a reaction container 21. A reaction chamber 211 is formed in the reaction container 21. The reaction chamber 211 is connected to the mixing device 10 and is used to receive the plastic pellet raw material mixture output from the mixing device 10. One end of the reaction container 21 is provided with a second motor 22. The second motor 22 is provided with a first gear box 23. A reaction inlet 212 is formed on the outer wall edge of one end near the second motor 22, so that the reaction chamber 211 and the mixing device 10 are connected to each other. A feed inlet 213 is formed on the outer wall edge at the middle position of the reaction container 21. Please refer to FIG. 6 for details. The feed inlet 213 is screwed with a second feed head 26. The second feed head 26 has a through hole 261 and a screw hole 26 disposed coaxially with the through hole 261. 2 and an inlet channel 263 connected to the through hole 261, one end of the through hole 261 is connected to the reaction chamber 211, a sealing member 264 is provided in the through hole 261, the sealing member 264 includes a pull rod 265, and the two ends of the pull rod 265 are provided with a plug 266 and an elastic part 267, the plug 266 is located between the through hole 261 and the reaction chamber 211, and the screw hole 262 is located far away from the inlet port 213 The stopper 27 is provided with a cylindrical knob 27, and the knob 27 has a stopper 271. At least one elastic member 272 is provided between the stopper 271 and the elastic member 267. The elastic member 272 is a spring. The elastic force of the elastic member 272 can push against the elastic member 267, so that the plug 266 has a preload to close the through hole 261. The elastic force of the elastic member 272 can be adjusted by the knob 27 to prevent the plastic pellets from mixing. The mixture flows out, one end of the feed channel 263 is vertically connected to the through hole 261, and the open end of the feed channel 263 is provided with a joint 268, and the joint 268 is connected to a ball valve, a filter, a pump 28 and a second storage barrel 29. The second storage barrel 29 is equipped with an isocyanate polymer containing NCO, a hydroxy compound containing OH, a chain extender or a catalyst, and can be metered and output, and the pump 28 is pressurized to push against the plug 26 6, and then input into the reaction chamber 211. As shown in FIG. 7, the other end of the reaction chamber 211 is further provided with a reaction outlet 215. The second motor 22 is connected to a pair of reaction screws 24 which are parallel to each other. The reaction screws 24 are arranged in the reaction chamber 211 and can be driven by the second motor 22 to react and output the plastic pellet raw material mixture. The reaction device 20 is provided near the reaction outlet 215. There is a second discharge valve 25, which is in the form of a plate and is radially penetrated through the outer wall of the reaction container 21. The second discharge valve 25 has a feed hole 251 and a discharge channel 252. The second discharge valve 25 is connected to a hydraulic cylinder 253 on the outer wall of the reaction container 21 to drive the second discharge valve 25. When the second discharge valve 25 is in the first position as shown in FIG. 8, the feed hole 251 is closed. The two ends are connected to the reaction chamber 211 and the reaction outlet 215 respectively, so that the reaction outlet 215 can output the plastic pellet raw material mixture. When the second discharge valve 25 is in the second position as shown in Figure 9, the reaction chamber 211 is connected to the discharge flow channel 252, so that the discharge flow channel 252 can output the plastic pellet raw material mixture and receive the plastic pellet raw material mixture through a container (not shown) to confirm the quality of the plastic pellet raw material mixture.

It is worth mentioning that the first storage barrels 123 can first meter and output a portion of the isocyanate polymer containing NCO or a portion of the hydroxyl compound containing OH into the feed chamber 121, and then the second storage barrel 29 can meter and output the remaining portion of the isocyanate polymer containing NCO or the remaining portion of the hydroxyl compound containing OH to the reaction chamber 211. In a preferred embodiment of the present invention, the molar ratio of OH group to NCO group in the pellet raw material mixture is between 1:1.1 and 0.8:1.0, wherein the first storage barrels 123 first meter out about 50% to less than 100% of the isocyanate polymer containing NCO into the feed chamber 121, and then the second storage barrel 29 meter out about less than 50% of the isocyanate polymer containing NCO into the reaction chamber 211. In another preferred embodiment of the present invention, the first storage barrels 123 first meter out about 50% to less than 100% of the hydroxyl compound containing OH into the feed chamber 121, and then the second storage barrel 29 meter out about less than 50% of the hydroxyl compound containing OH into the reaction chamber 211. In this way, the isocyanate polymer containing NCO or the hydroxyl compound containing OH can avoid the violent reaction of the plastic pellet raw material mixture and the generation of crystal points through the secondary output method, thereby further improving the quality and output of the plastic pellets of the present invention.

A reaction kneading and escorting device 30 is connected to the reaction device 20 in a sealed manner and includes a reaction kneading and escorting container 31. A reaction kneading and escorting chamber 311 is formed in the reaction kneading and escorting container 31. The reaction kneading and escorting chamber 311 is connected to the reaction device 20 for receiving the plastic pellet raw material mixture output from the reaction device 20. One end of the reaction kneading and escorting container 31 is provided with a third motor 32. The third motor 32 is provided with a second gear box 33. The reaction kneading and escorting container 31 is provided with a third motor 32 at one end thereof. The wall edge is provided with a reaction kneading and escorting inlet 312, so that the reaction kneading and escorting chamber 311 and the reaction device 20 are connected to each other. The other end of the reaction kneading and escorting chamber 311 is further provided with a reaction kneading and escorting outlet 313. The third motor 32 is connected to a pair of reaction kneading and escorting screws 34 parallel to each other, and the reaction kneading and escorting screws 34 are arranged in the reaction kneading and escorting chamber 311 and can be driven by the third motor 32 to react, knead and escort the plastic pellet raw material mixture and then output it, thereby completing the mixing reaction, kneading and escorting operations.

An underwater pelletizing device 40, as shown in FIG. 10, is connected to the mixing device 10 in a sealed manner, and is connected to the reaction kneading and conveying outlet 313 of the reaction kneading and conveying device 30, for receiving the plastic pellet raw material mixture output from the reaction kneading and conveying device 30, and cooling and shaping the plastic pellet raw material mixture and cutting it into a plurality of plastic pellets. The underwater pelletizing device 40 includes a die head 41, a cutting device 42, and a cooling device 43. The die head 41 includes a plurality of die holes 411, and the die holes 411 are connected to the reaction kneading and conveying outlet 313. The cutting device 4 2 is provided with a plurality of blades 421 and a motor 422. The blades 421 are pressed against the die head 41. The motor 422 is connected to and can rotate the blades 421. The cutting device 42 is connected to the cooling device 43. The cooling device 43 is a pipe body for cooling water to flow. Thus, when the pelletizing is performed in water, the pellet raw material mixture can be extruded from the die holes 411, and then the extruded pellet raw material mixture is cooled and molded through the cooling device 43. At the same time, the pellet raw material mixture that has been cooled and molded can be cut into pellets by rotating the blade 421 of the cutting device 42.

Among them, a third discharge valve 35, a melt pump 36, a double-drum screen changer 37, and a fourth discharge valve 38 are sequentially connected between the reaction kneading and conveying device 30 and the die head 41 of the underwater pelletizing device 40. The third discharge valve 35 and the fourth discharge valve 38 are the same as the first discharge valve 15 and the second discharge valve 25 mentioned above, and are not described separately. The melt pump 36 transports the plastic pellet raw material mixture to the underwater pelletizing device 40. The double-drum screen changer 37 has a pair of filters 371, and the filters can be replaced without stopping the machine, and impurities or foreign matter in the plastic pellet raw material mixture can be filtered.

A crystallization device 50 is a base having a crystallization flow channel 51 connected to the underwater pelletizing device 40. The crystallization flow channel 51 is a continuous S-shaped flow channel. The crystallization flow channel 51 is used to receive the plastic pellets and water flow output from the underwater pelletizing device 40, and the plastic pellets are gradually reacted and mixed to form macromolecular crystals at a temperature between 5 degrees C and 80 degrees C according to the hardness requirements, so that the plastic pellets have better physical properties and can withstand high temperatures.

A dehydration device 60 is connected to the crystallization device 50, and the dehydration device 60 includes an outer cover 61, a feed port 62 engraved at the bottom of the outer wall edge of the outer cover 61, a discharge port 63 engraved at the top of the outer wall edge of the outer cover 61, a particle storage tank 64 connected to the discharge port 63, a motor 65 disposed at the top of the outer cover 61, a shaft 66 located inside the outer cover 61 and connected to the motor, a plurality of feed plates 67 obliquely disposed on the shaft 66, a feed plate 67 disposed between the outer cover 61 and the outer cover 61, and a feed plate 68 disposed between the outer cover 61 and the outer cover 61. The filter screen 68 between the feed plates 67 and the water tank 69 below the outer cover 61, wherein the feed plates 67 are arranged in a stepped or spiral shape, whereby the feed port 62 is used to receive the plastic pellets in the crystallization flow channel 51 and transport them to the feed plates 67, the feed plates 67 rotate to generate centrifugal force for dehydration, and finally the dehydrated plastic pellets are discharged from the discharge port 63 to the pellet storage tank 64, and the water tank 69 recycles the removed water for reuse by the cooling device 43.

A drying device 70 is connected to the dehydration device 60. The drying device 70 has a vacuum suction machine 71 and a dry moisture storage machine 72. The vacuum suction machine 71 has a cavity 711, a suction pipe 712 connected to the top of the cavity 711, and a discharge port 713 arranged at the bottom of the cavity 711. The dry moisture storage machine 72 has a molecular sieve dehumidification wheel 721, an exhaust pipe 722 arranged at the discharge port 713, and a The suction pipe 723 at the top allows the suction pipe 712 to suck the plastic pellets from the pellet storage tank 64 and transport them to the cavity 711 for pellet storage. The suction pipe 723 can suck the gas in the cavity 711 and dehumidify it through the molecular sieve dehumidification wheel 721. The dry gas is then discharged from the exhaust pipe 722 to dry the plastic pellets in the cavity 711 and discharged from the discharge port 713 to the packaging machine. The plastic pellets can then be sent downstream to be made into various products.

In order to further understand the structural features, technical means used and expected effects of the present invention, the use of the present invention is described. It is believed that this will provide a deeper and more specific understanding of the present invention, as described below:

Please continue to refer to Figures 1 to 2. Through the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment 100, the user only needs to place the required raw materials such as NCO-containing isocyanate polymer, OH-containing hydroxyl compound and short chain extender in the first storage barrel 123, and output them to the feed chamber 121 and the mixing chamber 131 for mixing, and then pour them into the reaction device 20 for mixing reaction, and then output them to the reaction kneading press The feeding device 30 performs mixing reaction, kneading and escorting operations, and then the pelletizing device 40, the crystallization device 50, the dehydration device 60 and the drying device 70 are used for cooling and shaping and cutting into plastic pellets, thereby completing the production of plastic pellets. In this way, in the mixing, reaction, reaction, kneading and escorting process of the plastic pellet raw material mixture of the present invention, the emission of volatile organic compounds (VOC) is greatly reduced through a closed feeding environment, thereby avoiding environmental pollution and achieving an environmental protection effect.

It is worth mentioning that by using the first storage barrel 123 and the second storage barrel 29, the isocyanate polymer containing NCO or the hydroxyl compound containing OH is outputted in a secondary manner, which can avoid the violent reaction of the plastic pellet raw material mixture to produce crystal points, and further improve the quality and output of the plastic pellets of the present invention.

Here, the features of the present invention and its expected effects are described as follows:

The low VOC emission and environmentally friendly polyurethane plastic pellet manufacturing equipment provided by the present invention uses a closed feeding environment to significantly reduce the emission of volatile organic compounds (VOCs), avoid environmental pollution, and achieve environmental protection effects.

In summary, this invention has excellent advancement and practicality among similar products. At the same time, after searching domestic and foreign technical data on this type of structure, no similar structure has been found in the literature. Therefore, this invention has the patent requirements and is filed in accordance with the law.

However, the above is only a preferred feasible embodiment of the present invention, so any equivalent structural changes made by applying the present invention specification and the scope of patent application should be included in the patent scope of the present invention.

100: Low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment

10: Mixing device

11: First Motor

12: First feeding head

123: First storage tank

13: Mixed container

20:Reaction device

21: Reaction container

22: Second Motor

26: Second feeding head

28: Pump

29: Second storage tank

30: Reaction kneading and escorting device

31: Reaction kneading and escorting container

32: The third motor

Claims (9)

A low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment, which includes: a mixing device, which includes a first motor, a first feed head and a mixing container that are connected to each other in a sealed manner, the first feed head has a feed chamber, the first feed head is connected to a plurality of first storage barrels, the first storage barrels are used to store plastic pellet raw materials and can be metered and output to the feed chamber, the mixing container is formed with a mixing chamber connected to the feed chamber, and the mixing chamber has a A pair of mixing screws parallel to each other are provided, and the mixing screws are connected to the first motor to mix the plastic pellet raw materials into a plastic pellet raw material mixture; a reaction device, which includes a reaction container, a reaction chamber connected to the mixing device is formed in the reaction container, and a second motor is provided at one end of the reaction container, and the second motor is connected to a pair of reaction screws parallel to each other, and the reaction screws are arranged in the reaction chamber and can be driven by the second motor. The reaction container body is provided with a feed port on the outer wall edge, and the feed port is provided with a second feed head, and the second feed head is connected with a second storage barrel and can be metered and output to the reaction chamber; a reaction kneading and escorting device, which includes a reaction kneading and escorting container body, and a reaction kneading and escorting chamber connected to the reaction device is formed in the reaction kneading and escorting container body, and one end of the reaction kneading and escorting container body is provided with A third motor is connected to a pair of parallel reaction kneading and conveying screws, and the reaction kneading and conveying screws are arranged in the reaction kneading and conveying chamber and can be driven by the third motor to react knead and convey the plastic pellet raw material mixture and then output it; an underwater pelletizing device is connected to the reaction kneading and conveying device to receive the plastic pellet raw material mixture output from the reaction kneading and conveying device, and cool and shape the plastic pellet raw material mixture and cut it into a plurality of plastic pellets. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, the second feed head has a through hole, a screw hole coaxially arranged with the through hole and a feed flow channel connected to the through hole, one end of the through hole is connected to the reaction chamber, a sealing member is arranged in the through hole, and the sealing member includes a pull rod, and the two ends of the pull rod are provided with a plug and an elastic part, and the plug is located between the through hole and the reaction chamber. The screw hole is located far away from the feed port, and a cylindrical knob is screwed thereon. The knob has a stopper. At least one elastic member is provided between the stopper and the elastic member. The elastic member can push against the elastic member, so that the plug has a preload to seal the through hole. One end of the feed channel is vertically connected to the through hole. The open end of the feed channel is provided with a connector, which is connected to the second storage barrel. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, the first storage barrels are respectively equipped with an isocyanate polymer containing NCO, a hydroxyl compound containing OH and a short chain extender, and the second storage barrel is equipped with an isocyanate polymer containing NCO or a hydroxyl compound containing OH. The first storage barrels can first meter out a portion of the isocyanate polymer containing NCO or a portion of the hydroxyl compound containing OH to the feed chamber, and then the second storage barrel meter out the remaining portion of the isocyanate polymer containing NCO or the remaining portion of the hydroxyl compound containing OH to the reaction chamber. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 3, the first storage barrels first meter out the isocyanate polymer containing NCO at about 50% to less than 100% to the feed chamber, and then the second storage barrel meter out the isocyanate polymer containing NCO at less than 50% to the reaction chamber. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 3, the first storage barrels first meter and output about 50% to less than 100% of the hydroxyl compound containing OH to the feed chamber, and then the second storage barrel meter and output about less than 50% of the hydroxyl compound containing OH to the reaction chamber. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, the mixing chamber has a mixing outlet, the mixing device is provided with a first discharge valve near the mixing outlet, the first discharge valve has a feed hole and a discharge flow channel, when the first discharge valve is in the first position, the two ends of the feed hole are respectively connected to the mixing chamber and the mixing outlet, so that the mixing outlet can output the plastic pellet raw material mixture, when the first discharge valve is in the second position, the mixing chamber is connected to the discharge flow channel, so that the discharge flow channel can output the plastic pellet raw material mixture. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, the reaction chamber has a reaction outlet, and the reaction device is provided with a second discharge valve near the reaction outlet. The second discharge valve has a feed hole and a discharge flow channel. When the second discharge valve is in the first position, the two ends of the feed hole are respectively connected to the reaction chamber and the reaction outlet, so that the reaction outlet can output the plastic pellet raw material mixture. When the second discharge valve is in the second position, the reaction chamber is connected to the discharge flow channel, so that the discharge flow channel can output the plastic pellet raw material mixture. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, it further includes a crystallization device, which is connected to the underwater pelletizing device to receive the plastic pellets output from the underwater pelletizing device, and gradually react the plastic pellets at a temperature between 5 degrees C and 80 degrees C to form macromolecular crystals. According to the low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment described in claim 1, it further includes a dehydration device and a drying device. The dehydration device is connected to the water pelletizing device to receive the plastic pellets and dehydrate them. The drying device is connected to the dehydration device to receive the plastic pellets and dry them.

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