Environment-friendly polyurethane plastic particle manufacturing equipment with low VOC (volatile organic compound) emission

Abstract

Environment-friendly polyurethane plastic particle manufacturing equipment with low VOC (volatile organic compound) emission comprises a mixing device, a reaction device, a reaction kneading escorting device and an underwater pelletizing device which are connected with one another, the mixing device comprises a first feeding head and a mixing accommodating body, the first feeding head is connected with a plurality of first storage buckets, and the mixing accommodating body is connected with a plurality of second storage buckets; the mixing container is used for storing and outputting plastic particle raw materials, a pair of mixing screws are arranged in the mixing container, the reaction device is provided with a pair of reaction screws, and the reaction kneading escorting device is provided with a pair of reaction kneading escorting screws. The emission of volatile organic compounds (VOC) is greatly reduced, and the environmental pollution is avoided, so that the environmental protection effect is achieved.

Description

Technical Field

[0001] The present invention relates to a polyurethane plastic pellet manufacturing device, in particular to a low VOC emission environmentally friendly polyurethane plastic pellet manufacturing device. Background Art

[0002] For the existing polyurethane plastic pellet manufacturing equipment, please refer to Chinese patent application No. 201410771349.5 "Energy-saving and Carbon-reducing Composite Plastic Pellets Manufacturing Mechanism", which includes an injection mixing device, which is connected to a feeding device, which is connected to a kneading reaction device, which 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 chain 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.

[0003] The injection mixing head of the injection mixing device of the existing 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 being environmentally unfriendly. Summary of the invention

[0004] The purpose of the present invention is to provide a low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment, which can significantly reduce the emission of volatile organic compounds (VOC), avoid environmental pollution, and achieve environmental protection effects.

[0005] To achieve the above-mentioned purpose, the low-VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment provided by the present invention includes: a mixing device, which includes a first motor, a first feed head and a mixing container which are connected to each other in a closed manner, the first feed head has a feed chamber, the first feed head is connected to a plurality of first storage barrels, each of the first storage barrels is used to store plastic pellet raw materials and can be measured and output into the feed chamber, a mixing chamber connected to the feed chamber is formed in the mixing container, a pair of mixing screws parallel to each other are arranged in the mixing chamber, each of the mixing screws is connected to the first motor, and is used 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, a second motor is arranged at one end of the reaction container, and the second motor is connected to a pair of Reaction screws parallel to each other, and each of the reaction screws is 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 escorting device, which includes a reaction kneading and escorting container, a reaction kneading and escorting chamber connected to the reaction device is formed in the reaction kneading and escorting container, a third motor is arranged at one end of the reaction kneading and escorting container, and the third motor is connected to a pair of reaction kneading and escorting screws parallel to each other, and each of the reaction kneading and escorting screws is arranged in the reaction kneading and escorting chamber and can be driven by the third motor to react knead and escort the plastic pellet raw material mixture and output it; an underwater pelletizing device, which is connected to the reaction kneading and escorting device, for receiving the plastic pellet raw material mixture output from the reaction kneading and escorting device, and cooling and shaping the plastic pellet raw material mixture and cutting it into a plurality of plastic pellets.

[0006] As a preferred solution, an inlet is hollowed out on the outer wall edge of the reaction container, and the inlet is provided with a second inlet head, which is connected to a second storage barrel and can output measured materials into the reaction chamber.

[0007] As a preferred embodiment, the second feed head has a through hole, a screw hole coaxially arranged with the through hole and an inlet channel connected to the through hole, one end of the through hole is connected to the reaction chamber, a closing member is arranged in the through hole, the closing member includes a pull rod, a plug and an elastic part are arranged at both ends of the pull rod, the plug is located between the through hole and the reaction chamber, the screw hole is located at a position away from the feed port, and a cylindrical knob is screwed thereon, the knob has a stopper, at least one elastic member is arranged between the stopper and the elastic member, the elastic member can push against the elastic member so that the plug has a pre-force to close the through hole, one end of the inlet channel is vertically connected to the through hole, and a joint is arranged at the open end of the inlet channel, and the joint is connected to the second storage barrel.

[0008] As a preferred embodiment, each of the first storage barrels is 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. Each of the first storage barrels can first meter and output a portion of the isocyanate polymer containing NCO or a portion of the hydroxyl compound containing OH into the feeding chamber, and then the second storage barrel meters and outputs the remaining portion of the isocyanate polymer containing NCO or the remaining portion of the hydroxyl compound containing OH to the reaction chamber.

[0009] As a preferred embodiment, each of the first storage barrels first meters and outputs about 50% to less than 100% of the isocyanate polymer containing NCO into the feeding chamber, and then the second storage barrel meters and outputs about less than 50% of the isocyanate polymer containing NCO into the reaction chamber.

[0010] As a preferred solution, each of the first storage barrels firstly meters and outputs about 50% to less than 100% of the hydroxyl compound containing OH into the feeding chamber, and then the second storage barrel meters and outputs about less than 50% of the hydroxyl compound containing OH into the reaction chamber.

[0011] As a preferred embodiment, the mixing chamber has a mixing outlet, and 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 channel. When the first discharge valve is in a 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 a second position, the mixing chamber is connected to the discharge channel, so that the discharge channel can output the plastic pellet raw material mixture.

[0012] As a preferred embodiment, 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 channel. When the second discharge valve is in a 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 a second position, the reaction chamber is connected to the discharge channel, so that the discharge channel can output the plastic pellet raw material mixture.

[0013] As a preferred embodiment, it further comprises 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 and mix the plastic pellets at a temperature between 5 degrees C and 80 degrees C to form macromolecular crystals.

[0014] As a preferred embodiment, it further comprises a dehydration device and a drying device, wherein the dehydration device is connected to the underwater pelletizing device to receive and dehydrate the plastic pellets, and the drying device is connected to the dehydration device to receive and dry the plastic pellets.

[0015] The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment provided by the present invention significantly reduces the emission of volatile organic compounds (VOC) through a closed feeding environment, thereby avoiding environmental pollution and achieving an environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a combination of a preferred embodiment of the present invention.

[0017] Figure 2 It is a combined cross-sectional view of a preferred embodiment of the present invention.

[0018] Figure 3 It is a cross-sectional view of the first feed head.

[0019] Figure 4 It is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the feeding form of the first discharge valve.

[0020] Figure 5 It is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the discharge form of the first discharge valve.

[0021] Figure 6 It is a combined cross-sectional view of the second feed head of the present invention.

[0022] Figure 7 This is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the feeding form of the second feeding head.

[0023] Figure 8 It is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the feeding form of the second discharge valve.

[0024] Fig. 9 It is a schematic diagram of the use of a preferred embodiment of the present invention, used to show the discharge form of the second discharge valve.

[0025] Fig.10 It is a schematic diagram of a preferred embodiment of the present invention, used to show the configuration of an underwater pelletizing device, a crystallizing device, a dehydrating device and a drying device.

[0026] Explanation of symbols in the figure: 100 Low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment 10 Mixing device 11 First motor 12 First feed head 121 feeding chamber 122 feeding hole 123 first material storage barrel 13 mixing container 131 mixing chamber 132 mixing outlet 14 Mixing screw 15 First discharge valve 151 feeding hole 152 discharge channel 153 Hydraulic Cylinder 20. Reaction device 21 reaction container 211 reaction chamber 212 Reaction inlet 213 Feed inlet 215 Reaction outlet 22 Second motor 23 First gear box 24 Reaction screw 25 Second discharge valve 251 Feed hole 252 Discharge channel 253 Hydraulic cylinder 26 Second feeding head 261 Through hole 262 screw hole 263 inlet channel 264 Closure 265 Pull rod 266 plug 267 elastic part 268 Connector 27 Knob 271 stopper 272 elastic member 28 Pump 29 Second storage tank 30 Reaction kneading and conveying device 31 reaction kneading escort container 311 reaction kneading and escorting chamber 312 reaction kneading and escorting entrance 313 Reaction kneading escort outlet 32 ​​The third motor 33 Second gear box 34 Reaction kneading conveying screw 35 The third discharge valve 36 Melt pump 37 Double-drum screen changer 371 Filter 38 Fourth discharge valve 40 Underwater pelletizing device 41 Die head 411 Die hole 42 Cutting device 421 Blade 422 Motor 43 Cooling device 50 Crystallization device 51 Crystallization channel 60 Dehydration device 61 Cover 62 Feeding port 63 Discharge port 64 Granule storage tank 65 Motor 66 Shaft 67 Feed plate 68 Filter 69 sink 70 Drying device 71 Vacuum suction machine 711 cavity 712 suction pipe 713 discharge port 72 Drying and dehumidifying machine 721 Molecular sieve dehumidification wheel 722 Exhaust duct 723 Suction duct. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Figure 1 as well as Figure 2 As shown, it is a combined schematic diagram and a combined cross-sectional view of a preferred embodiment of the present invention, which discloses 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 a first feed head 12 and a mixing container 13 connected to each other, and the first motor 11, the first feed head 12 and the mixing container 13 are closed to prevent volatile organic compounds (VOC) generated during the mixing reaction from being discharged to the outside to avoid air pollution and environmental protection. Please refer to Figure 3As shown, 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, each of which is connected to the feed chamber 121, and each of which is connected to at least one first storage barrel 123 in a sealed manner such as a locking or screwing manner. Each of the first storage barrels 123 is used to store several different plastic pellet raw materials. Each of the first storage barrels 123 is respectively equipped with an isocyanate polymer containing NCO, a hydroxyl compound containing OH and a short chain extender, and the output is metered. In the embodiment of the present invention, The number of the first feed heads 12 is 1 to 2 and they overlap up and down, each first feed head 12 can be connected to 1 to 5 first storage barrels 123, and the number of each of the first storage barrels 123 is 1 to 10, wherein, in another preferred embodiment of the present invention, each of the first storage barrels 123 is 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 inhibitor, heat resistant agent, antioxidant, accelerator or environmentally friendly plasticizer, or a combination thereof, and can be metered and output into the feed chamber 121. A mixing chamber 131 and a mixing outlet 132 communicating with the mixing chamber 131 are formed in the mixing container 13. One end of the mixing chamber 131 is connected to the feed chamber 121 for receiving the plastic pellet raw material. A pair of mixing screws 14 parallel to each other are arranged in the mixing chamber 131. Each of the mixing screws 14 extends to the feed chamber 121. , and connected to the first motor 11, for mixing 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, wherein the mixing device 10 is provided with a first discharge valve 15 near the mixing outlet 132, the first discharge valve 15 is columnar, plate-shaped or strip-shaped, and is radially penetrated through the outer wall of the mixing container 13, the first discharge valve 15 has a feed hole 151 and a discharge channel 152, the first discharge valve 15 is connected to the outer wall of the mixing container 13 with a hydraulic cylinder 153, and can drive the first discharge valve 15, wherein, when the first discharge valve 15 is as follows Figure 4 In the first position shown in FIG. 1 , the two ends of the feed 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. Figure 5 In the second position shown, the mixing chamber 131 is connected to the discharge channel 152, so that the discharge channel 152 can output the plastic pellet raw material mixture and receive the plastic pellet raw material mixture through a container (not shown in the figure) to confirm the quality of the plastic pellet raw material mixture.

[0028] A reaction device 20 is connected to the mixing device 10 in a closed 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. A second motor 22 is provided at one end of the reaction container 21. The second motor 22 is provided with a first gear box 23. A reaction inlet 212 is hollowed out on the outer wall edge of one end of the reaction container 21 near the second motor 22, so that the reaction chamber 211 and the mixing device 10 are connected and connected to each other. A feed inlet 213 is hollowed out on the outer wall edge at the middle position of the reaction container 21. Please refer to Figure 6 As shown, the feed port 213 is screwed with a second feed head 26, and the second feed head 26 has a through hole 261, a screw hole 262 coaxially arranged with the through hole 261, and an inlet flow channel 263 connected to the through hole 261. One end of the through hole 261 is connected to the reaction chamber 211. A closing member 264 is arranged in the through hole 261. The closing member 264 includes a pull rod 265. A plug 266 and an elastic part 267 are arranged at both ends of the pull rod 265. The plug 266 is located between the through hole 261 and the reaction chamber 211. The screw hole 262 is located at a position away from the feed port 213 and is screwed with a cylindrical knob 27. The knob 27 has a stopper 271. At least one elastic part 267 is arranged between the stopper 271 and the elastic part 267. The elastic member 272 is a spring. The elastic force of the elastic member 272 can push against the elastic part 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 through the knob 27 to prevent the plastic pellet raw material mixture from flowing out. One end of the feed channel 263 is vertically connected to the through hole 261. The open end of the feed channel 263 is provided with a joint 268. The joint 268 is connected with 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 hydroxyl compound containing OH, a chain extender or a catalyst, and can be metered and output. The pump 28 is pressurized to push against the plug 266, and then input into the reaction chamber 211. Figure 7As shown, a reaction outlet 215 is further hollowed out at the other end of the reaction chamber 211, and the second motor 22 is connected to a pair of reaction screws 24 parallel to each other, and each of the reaction screws 24 is arranged in the reaction chamber 211 and can be driven by the second motor 22 to react and output the plastic granule raw material mixture, wherein the reaction device 20 is provided with a second discharge valve 25 near the reaction outlet 215, and the second discharge valve 25 is in the shape of a plate and radially penetrates the outer wall of the reaction container 21, and the second discharge valve 25 has a feeding hole 251 and a discharge channel 252, and the second discharge valve 25 is connected to the outer wall of the reaction container 21 with a hydraulic cylinder 253, which can drive the second discharge valve 25, wherein when the second discharge valve 25 is as shown in FIG. Figure 8 In the first position shown in FIG. 1 , the two ends of the feed hole 251 are respectively connected to the reaction chamber 211 and the reaction outlet 215, so that the reaction outlet 215 can output the plastic pellet raw material mixture. Fig. 9 In the second position shown, the reaction chamber 211 is connected to the discharge channel 252, so that the discharge channel 252 can output the plastic pellet raw material mixture and receive the plastic pellet raw material mixture through a container (not shown in the figure) to confirm the quality of the plastic pellet raw material mixture.

[0029] It is worth mentioning that each of the first storage barrels 123 can first meter out 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 meter out the remaining portion of the isocyanate polymer containing NCO or the remaining portion of the hydroxyl compound containing OH into the reaction chamber 211. In a preferred embodiment of the present invention, the molar ratio of the OH group and the NCO group of the granulated raw material mixture is between 1 to 1.1 and 0.8 to 1.0, wherein each of 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, each of the first storage barrels 123 firstly outputs about 50% to less than 100% of the hydroxyl compound containing OH into the feed chamber 121, and then the second storage barrel 29 outputs 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, thereby further improving the quality and yield of the plastic pellets of the present invention.

[0030] A reaction kneading and escorting device 30 is connected to the reaction device 20 in a closed 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 and is used to receive the plastic pellet raw material mixture output from the reaction device 20. A third motor 32 is provided at one end of the reaction kneading and escorting container 31. The third motor 32 is provided with a second gear box 33. The reaction kneading and escorting container 31 is hollowed out at the outer wall edge of one end near the third motor 32. A reaction kneading and escorting inlet 312 is provided, so that the reaction kneading and escorting chamber 311 and the reaction device 20 are connected to each other, and a reaction kneading and escorting outlet 313 is further hollowed out at the other end of the reaction kneading and escorting chamber 311. The third motor 32 is connected to a pair of reaction kneading and escorting screws 34 parallel to each other, and each of the reaction kneading and escorting screws 34 is 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 granule raw material mixture and then output it, thereby completing the mixing reaction, kneading and escorting operations.

[0031] 1. In-water pelletizing device 40, please refer to Fig.10 As shown, it is connected to the mixing device 10 in a closed manner, and is connected to the reaction kneading and escorting outlet 313 of the reaction kneading and escorting device 30, for receiving the plastic pellet raw material mixture output from the reaction kneading and escorting 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, each of which is connected to the reaction kneading and escorting outlet 313. The cutting device 42 is provided with a plurality of blades 421 and a motor 422, each of the blades 421 is pressed against the die head 41, the motor 422 is connected to and can rotate each of 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, thereby, when pelletizing in water, the plastic pellet raw material mixture can be extruded from each of the die holes 411, and then the extruded plastic pellet raw material mixture is cooled and molded by the cooling device 43, and at the same time, the cooled and molded plastic pellet raw material mixture can be cut into plastic pellets by rotating the blades 421 of the cutting device 42.

[0032] 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 escorting outlet 313 of the reaction kneading and escorting 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 further described. 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.

[0033] 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 gradually react and mix the plastic pellets at a temperature between 5 degrees C and 80 degrees C according to the hardness requirements to form macromolecular crystals. Therefore, the plastic pellets have better physical properties and can withstand high temperatures.

[0034] 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 hollowed out at the bottom of the outer wall edge of the outer cover 61, a discharge port 63 hollowed out 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, and a feed plate 67 located between the outer cover 61 and each of the feed plates 67. The filter screen 68 between the feed plates 67 and a water tank 69 located below the outer cover 61, wherein each of the feed plates 67 is 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 each of the feed plates 67, each of the feed plates 67 will rotate to generate centrifugal force for dehydration, and finally the dehydrated plastic pellets will be discharged from the discharge port 63 to the pellet storage tank 64, and the water tank 69 will recycle the removed water for reuse by the cooling device 43.

[0035] A drying device 70 is connected to the dehydration device 60, and the drying device 70 has a vacuum suction machine 71 and a drying and 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 drying and moisture storage machine 72 has a molecular sieve dehumidification wheel 721, an exhaust pipe 722 arranged at the discharge port 712, and a discharge port 713 arranged at the top of the cavity 711. The suction pipe 723 at the bottom can be used to absorb the plastic pellets in the pellet storage tank 64 and transport them to the pellet storage tank in the cavity 711. The suction pipe 723 can absorb 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 to the packaging machine through the discharge port 712. The plastic pellets can then be sent downstream to be made into various products.

[0036] Please continue reading Figure 1 to Figure 2 As shown, 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 isocyanate polymer containing NCO, hydroxyl compound containing OH and short chain extender in each of the first storage barrels 123, and output them to the feeding 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 and escorting device 30 for mixing reaction, kneading and escorting operations, and then pass through the underwater pelletizing device 40, the crystallization device 50, the dehydration device 60 and the drying device 70 for cooling, shaping and cutting into plastic pellets, thereby completing the plastic pellet manufacturing. In this way, during 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 by the closed feeding environment, and environmental pollution is avoided, thereby achieving an environmental protection effect.

[0037] It is worth mentioning that, by outputting the isocyanate polymer containing NCO or the hydroxyl compound containing OH in a secondary manner through the first storage barrel 123 and the second storage barrel 29, the granule raw material mixture can be prevented from reacting violently to produce crystal points, thereby further improving the granule quality and yield of the present invention. The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment, characterized in that: Contains: A mixing device, comprising a first motor, a first feed head and a mixing container which are connected to each other in a closed manner, wherein the first feed head has a feed chamber, the first feed head is connected to a plurality of first storage barrels, each of the first storage barrels is used to store plastic pellet raw materials and can be metered and output into the feed chamber, a mixing chamber connected to the feed chamber is formed in the mixing container, a pair of mixing screws parallel to each other are arranged in the mixing chamber, each of the mixing screws is connected to the first motor, and is used to mix the plastic pellet raw materials into a plastic pellet raw material mixture; A reaction device, comprising a reaction container, a reaction chamber connected to the mixing device is formed in the reaction container, a second motor is provided at one end of the reaction container, a pair of parallel reaction screws are connected to the second motor, and each of the reaction screws is arranged in the reaction chamber and can be driven by the second motor to react and output the mixture of plastic pellet raw materials; A reaction kneading and escorting device, comprising a reaction kneading and escorting container, a reaction kneading and escorting chamber connected to the reaction device is formed in the reaction kneading and escorting container, a third motor is provided at one end of the reaction kneading and escorting container, the third motor is connected to a pair of reaction kneading and escorting screws parallel to each other, and each of the reaction kneading and escorting screws is arranged in the reaction kneading and escorting chamber and can be driven by the third motor to react, knead and escort the plastic pellet raw material mixture and then output it; An underwater pelletizing device is connected to the reaction kneading and escorting device to receive the plastic pellet raw material mixture output from the reaction kneading and escorting device, cool the plastic pellet raw material mixture to shape it and cut it into a plurality of plastic pellets.

2. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 1 is characterized in that: The outer wall edge of the reaction container is provided with a feed inlet, the feed inlet is provided with a second feed head, the second feed head is connected with a second storage barrel, and can output the material into the reaction container in a measured manner.

3. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 2 is characterized in that: The second feed head has a through hole, a screw hole coaxially arranged with the through hole and an inlet channel connected to the through hole, one end of the through hole is connected to the reaction chamber, a closing member is arranged in the through hole, the closing member includes a pull rod, a plug and an elastic part are arranged at both ends of the pull rod, the plug is located between the through hole and the reaction chamber, the screw hole is located at a position away from the feed port, and a cylindrical knob is screwed thereon, the knob has a stopper, at least one elastic member is arranged between the stopper and the elastic member, the elastic member can push against the elastic member so that the plug has a pre-force to close the through hole, one end of the inlet channel is vertically connected to the through hole, and a joint is arranged at the open end of the inlet channel, and the joint is connected to the second storage barrel.

4. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 2 is characterized in that: Each of the first storage barrels is 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. Each of the first storage barrels can first meter and output a part of the isocyanate polymer containing NCO or a part of the hydroxyl compound containing OH into the feeding chamber, and then the second storage barrel meters and outputs the remaining part of the isocyanate polymer containing NCO or the remaining part of the hydroxyl compound containing OH to the reaction chamber.

5. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 4 is characterized in that: Each of the first storage barrels firstly outputs about 50% to less than 100% of the isocyanate polymer containing NCO into the feeding chamber, and then the second storage barrel outputs about less than 50% of the isocyanate polymer containing NCO into the reaction chamber.

6. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 4 is characterized in that: Each of the first storage barrels firstly outputs about 50% to less than 100% of the hydroxyl compound containing OH into the feeding chamber, and then the second storage barrel outputs about less than 50% of the hydroxyl compound containing OH into the reaction chamber.

7. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 1 is characterized in that: The mixing chamber has a mixing outlet, and the mixing device is provided with a first discharge valve near the mixing outlet. The first discharge valve has a feeding hole and a discharge flow channel. When the first discharge valve is in the first position, the two ends of the feeding 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.

8. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 1 is characterized in that: 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 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 channel, so that the discharge channel can output the plastic pellet raw material mixture.

9. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 1, characterized in that: It further comprises 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 and mix the plastic pellets at a temperature between 5 degrees C and 80 degrees C to form macromolecular crystals.

10. The low VOC emission environmentally friendly polyurethane plastic pellet manufacturing equipment according to claim 1, characterized in that: It further comprises a dehydrating device and a drying device. The dehydrating device is connected with the underwater pelletizing device to receive and dehydrate the plastic pellets. The drying device is connected with the dehydrating device to receive and dry the plastic pellets.

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