CN214491295U - Device for producing section bar by using mixed recyclable waste plastics as raw material - Google Patents

Abstract

The utility model discloses an use device of mixed recoverable regeneration waste plastics as raw materials production section bar belongs to plastic processing equipment technical field. The device comprises an extruder, a shaping device, a traction cutting device and a product stacking device, wherein the extruder mainly comprises an extruder hopper, a screw machine barrel with a plurality of heating zones, a die head with a plurality of heating zones and a forming die; the multiple heating zones of the screw machine barrel and the die head can be set to different temperatures, the heating zones of the screw machine barrel can adopt a mode of gradually heating, the die head adopts a jumping heating mode to heat and melt the profile raw material, the die head is connected with the screw machine barrel, the forming die is connected with the die head, the forming die is connected with the sizing die, the sizing die and the forming die are respectively connected with a quenching device, and the melted material is cooled and shaped in the die cavity according to the designed shape. The utility model discloses a carry out the operation of progressively intensification melting and quench design to the material, make the section bar design more stable and the product surface is glossier.

Description

Device for producing section bar by using mixed recyclable waste plastics as raw material

Technical Field

The utility model belongs to the technical field of the plastic processing equipment, concretely relates to use device of mixed recoverable regeneration waste plastics as raw materials production section bar.

Background

In order to reduce waste plastic landfill disposal and encourage recycling of recycled resources, plastic profiles produced from recycled waste plastic pellets have been widely used in recent years at home and abroad. The plastic section bar which is widely produced and used at present mainly comprises the following parts: 1. wood-plastic section bar: outdoor wood-plastic floor, wallboard, decorative board. The raw material is generally PVC foaming, and PVC or PE is a base raw material and is a wood-plastic product added with plant fibers such as rice hulls, straws, wood powder and the like. Wood-plastic is a recyclable and renewable plastic such as: waste plastics with single components such as polyethylene, polypropylene, polyvinyl chloride and the like are subjected to sorting of the same components, cleaning and crushing, more than 35-70% of waste plant fibers such as wood flour, rice hulls, straws and the like are added, the mixture is pelletized into a wood-plastic composite material, the wood-plastic composite material is heated by an extruder to become a molten object, a screw is conveyed to a shaping die cooled by circulating water, and the wood-plastic composite material is processed by a cooling process of cooling water spraying and cold water soaking in a water tank. 2. The foaming section without the added plant fiber: outdoor floors, leisure tables and chairs in public places, galleries and the like. The raw material is single-component recyclable recycled plastic of PP or PE, and the plastic with the same component is sorted and crushed to be subjected to recycling granulation. Then adding foaming agent into the granules, putting the granules into an extruder, heating the granules to obtain a molten object, conveying the molten object to a shaping die cooled by circulating water by a screw, and processing the molten object by a cooling process of cooling water spraying and cold water soaking in a water tank.

The traditional production technology of the section bar produced by recycled plastic or wood plastic is to recycle waste plastic, sort, clean, crush and regenerate and granulate, or to add plant fiber and then granulate into wood plastic composite particles. Utilize the barrel heating of extruder, extrude the die head after melting material granule, the preceding moulded die that is equipped with of die head, set up recirculated cooling water passageway in the die cavity of moulded die, the fuse-element in to the moulded die is cooled off by the cooling water makes the material stiffening primary molding in the die cavity, in the die cavity of stock mould is being drained to the material with primary molding, the general length 300mm-800mm of stock mould, constitute by 1-3 sections, set up recirculated cooling water passageway in the die cavity, cool off by the cooling water circulation process, stock mould interconnect, or the part is connected and set up little water tank between two sections and have spray set, the cooling water sprays and cools off. And a 2000-4000mm cooling water tank is arranged at the rear end of the sizing die, the section passing through the sizing die is further soaked and cooled in the cooling water tank, is dragged by a tractor to reach a cutting machine, and is cut and then arranged by a stacking hopper frame.

The traditional process technology has the following defects: 1) only single raw materials with the same melt index can be produced or auxiliary raw materials with good stability can be added. Such as PVC profiles, PVC plus wood flour, or PE plus wood flour. The wood-plastic product is mildewed and rotten due to the natural decomposition of the added plant fibers and the breeding of bacteria and algae. Can not meet the production process of mutually mixing various high polymer waste plastics with different melt indexes for producing the additive-free plant fiber. 2) In the production process, a spray head is arranged between the circulating water cooling shaping die and the shaping die to spray and cool the product, and the product is shaped by soaking and cooling in a cooling water tank. The product prepared by the method has rough surface, unstable shaping and easy distortion and deformation. And the creep property is large in the using process and the deformation is easy. The product is easily affected by weather, becomes brittle and fragile, and the service life is shortened. 3) The production raw materials are single high molecular components, plant fibers are added or single high molecular return materials are granulated, and the raw materials with different types and different melt indexes are sorted, crushed and granulated in the waste plastic recycling process. And the granulation process causes great pollution to the environment.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, an object of the present invention is to provide a device for producing section bars by using mixed recyclable waste plastics as raw materials

In order to achieve the purpose, the following technical scheme is provided:

a device for producing section bars by taking mixed recyclable waste plastics as raw materials comprises an extruder, a shaping device, a traction cutting device and a product stacking device, wherein the extruder mainly comprises an extruder hopper, a screw cylinder with a plurality of heating zones, a die head, a plurality of die head heating zones arranged on the die head and a forming die; the extruder hopper is arranged on the feeding input end of the screw machine barrel and used for feeding; the heating zones of the screw cylinder are connected in sequence, the heating zones of the die head are connected in sequence, the heating zones of the screw cylinder and the heating zones of the die head are set to be at different temperatures, the section material can be heated and melted by adopting a step-by-step heating mode, the heating zone of the die head is set to be 20% higher than the temperature of a screw machine barrel, so that the stable foaming of the melt in the die head and the sufficient melting of the melt mixed by different materials are ensured, the screw is arranged in the machine barrel, and is connected with the extruder transmission device, the die head is connected with the screw machine barrel, one end of the forming die is connected with the die head, the other end is connected with the shaping device, the shaping device is used for further shaping, the shaping device and the forming die are respectively connected with a water chiller used for ultralow temperature of minus 5 ℃ to minus 10 ℃, and (3) delivering a refrigerant of-5 to-10 ℃ by a water chiller to circularly cool and shape the melted material.

Further, the shaping device comprises a spraying water tank, a vacuum shaping table and a shaping mold; the shaping mold and the spraying water tank are sequentially arranged above the vacuum shaping table.

Further, the stock mould comprises multisection module, is provided with the circulative cooling passageway in the stock mould, the circulative cooling passageway is imported and exported through the refrigerant on the stock mould and is connected with the cold water machine for carry out further cooling design to the section bar in the stock mould, sealing connection between a section of stock mould and a section of stock mould, and have certain interval between the stock mould that is close to the basin that sprays, reducible section bar extrusion process's pressure and resistance also can be used to observe the design condition of the section bar in the model cavity of setting, so that adjust operating condition.

Furthermore, the length of the stock mould exceeds 2.5 meters, and the stock mould can be continuously cooled at low temperature for a long time, so that the requirement of stable forming is met.

Furthermore, the Teflon adhesive tape is pasted in the molding cavity of the stock mold, the mixture has the characteristic of high viscosity, the resistance generated in the molding cavity is increased, and the pasted Teflon adhesive tape has the advantages of high temperature resistance and smoothness increase.

Further, the stock mould on be provided with evacuating device gas pocket, the installation vacuum pump for adsorb the section bar in the die cavity, make and more hug closely with the stock mould inner wall, the stock mould contracts fast under the low temperature fast cold state this moment, plays the effect of dual pressure to the section bar design in the die cavity.

Furthermore, the stock mould and the forming mould are in sealing connection through a connecting pin.

Furthermore, the forming die is provided with a die cavity and a circulating cooling channel, and the circulating cooling channel is connected with a water chiller through a refrigerant inlet and a refrigerant outlet.

Furthermore, the cooling characteristic of the shaping mold is that a cooling medium is ethylene glycol, and a water chiller from minus 5 ℃ to minus 10 ℃ is used as a refrigeration equipment connecting circulating cooling channel.

Furthermore, the traction cutting device is a traction cutting integrated machine, and the shaped product is drawn by the traction machine and cut after being fixed in length.

Further, the product stacking device is a stacking hopper frame.

Compared with the prior art, the utility model discloses effectively optimize not enough that exist on the current traditional handicraft:

1) the utility model discloses equipment adopts die head jump intensification and fuse-element to cool off the design rapidly, can only use the single polymer of the same kind of the same melt index as the raw materials or add vegetable fibre's problem in the solution production process.

2) The product is not soaked and cooled by cooling water in the production process, the luster and beautification of the surface of the product are improved, and the prepared product is more stable in shape, the creep property is reduced, the weather resistance of the product in different climatic environments is improved, and the deformation is reduced by carrying out gradual heating and subzero temperature quenching operations on the section bar.

3) The mixed waste plastics are crushed or shredded to manufacture the section bar, so that the problem of difficult waste plastics garbage treatment is solved.

4) Because the granulation process is not needed, the problem of environmental pollution caused by the emission of waste water, waste gas and the like is avoided.

Drawings

FIG. 1 is a schematic perspective view of an extruder of the present invention;

FIG. 2 is a left side perspective view of the forming mold of the present invention;

FIG. 3 is a right side perspective view of the forming mold of the present invention;

fig. 4 is a schematic perspective view of the shaping device of the present invention;

fig. 5 is a left side perspective view of the stock mold of the present invention;

fig. 6 is a schematic right side perspective view of the stock mold of the present invention.

In the figure: 1-extruder hopper; 2-screw barrel; 3-die head heating zone; 4-a die head; 5-forming a mould; 6-vacuum shaping table; 7-shaping mold; 8-vacuumizing the device air hole; 9-a spray water tank; 10-a cavity; 11-a first refrigerant inlet; 111-a first refrigerant outlet; 12-a second refrigerant inlet; 14-a second refrigerant outlet; 15-a third refrigerant inlet; 151-third refrigerant outlet; 161-a fourth refrigerant inlet; 16-a fourth refrigerant outlet; 17-a fifth refrigerant inlet; 171-fifth refrigerant outlet.

Detailed Description

The invention will be further described with reference to the following examples and the accompanying drawings, but the scope of the invention is not limited thereto.

As shown in fig. 1, the extruder in the device for producing section bar by using mixed recyclable waste plastics as raw materials mainly comprises an extruder hopper 1, a screw barrel 2 with five heating zones, three die head heating zones 3 arranged on a die head 4, a die head 4 and a forming die 5, wherein the five heating zones of the screw barrel 2 are connected in sequence, the three die head heating zones 3 are connected in sequence, the screw barrel 2 is connected with the die head 4, the feeding input end of the screw barrel 2 with a plurality of heating zones is provided with the extruder hopper 1 for feeding, and the die head 4 is connected with the forming die 5.

As shown in fig. 2 and 3, a molding die 5 designs a cavity 10 according to the specification and shape of a profile and the shrinkage rate of a material, the molding die 5 is provided with a circulating cooling channel, two sides of the molding die 5 are respectively provided with a first refrigerant inlet 11, a first refrigerant outlet 111, a second refrigerant inlet 12 and a second refrigerant outlet 14, a low temperature resistant plastic connecting pipeline is respectively arranged between an inlet and an outlet of the circulating cooling channel of the molding die 5 and a water chiller with the temperature of minus 5 ℃ to minus 10 ℃ and used for conveying refrigerants and performing circulating cooling on the material in the die, the refrigerants enter from the first refrigerant inlet 11, exit from the first refrigerant outlet 111, enter from two holes of the second refrigerant inlet 12 and obliquely flow to two outlet holes of the second refrigerant outlet 14.

As shown in fig. 4, a multi-section shaping mold 7 is fixedly connected above the vacuum shaping table 6, a circulating cooling channel is arranged in the shaping mold 7, and low temperature resistant plastic pipelines are respectively arranged at an inlet and an outlet of a refrigerant and are respectively connected with a water chiller at the temperature of minus 5 ℃ to minus 10 ℃ for conveying the refrigerant to cool materials in the mold; the upper surface of the stock mould 7 is provided with an air hole 8 of a vacuumizing device, the front 1.5 m of the stock mould 7 is hermetically connected with the stock mould 7, and a certain interval is reserved between the stock moulds 7 close to the spray water tank 9, so that the pressure and resistance of the profile extrusion process can be reduced, and the shaping condition of the profile in the cavity of the stock mould 7 can be observed, so that the operation condition can be adjusted. The vacuum shaping table 6 is also provided with a spraying water tank 9, a circulating cooling water spraying pipeline is arranged in the spraying water tank 9, and further spraying cooling can be carried out if necessary according to the cooling shaping condition of the section in the shaping mold 7. A traction cutting machine is arranged behind the spraying water tank 9, resistance is increased due to the fact that the section is influenced by temperature and pressure in the over-length shaping die 7, the section needs to be pulled by the traction machine to help the section to be extruded out, the section is pulled to the cutting device by the traction machine, the section is cut by the cutting device, and after the section is cut, the section is arranged by the stacking tipping bucket frame.

As shown in fig. 5 and 6, a refrigerant in the water chiller enters from the third refrigerant inlet 15 of the first section of the sizing die 7 and flows from a circulating cooling channel inside the sizing die 7 to the third refrigerant outlet 151 to flow out, the refrigerant then flows to the fourth refrigerant inlet 161 through a low temperature resistant plastic pipeline between the fourth refrigerant inlet 161 and the third refrigerant outlet 151, flows to the fourth refrigerant outlet 16 from the circulating cooling channel inside the sizing die 7, and flows to the next inlet through a low temperature resistant plastic pipeline between the cooling medium inlet and the cooling medium outlet, the refrigerant flows in the circulating cooling channel of the sizing die 7 in the above manner, the refrigerant flow manner of the lower template of the sizing die 7 is the same as that of the upper die plate, and the refrigerant flow manner of the two sides of the cavity of the sizing die 7 is that the refrigerant flows from the fifth refrigerant outlet 171 on the same side after flowing from the fifth refrigerant inlet 17. The coolant flows out from the last coolant outlet of the first section of the stock mold 7, collects to a main pipe, the main pipe splits and then enters the second section of the stock mold, the flowing mode of the coolant in the subsequent stock mold 7 is the same as that of the first section of the stock mold 7, and the coolant flows out finally and enters the water cooler for recirculation through a loop pipe of the water cooler.

Waste plastics PP, PE (HDPE, LDPE), ABS, PS and the like which are mixed with each other are crushed, and a foaming agent in a proportion required by a formula is added, so that the profile is foamed, the density is reduced, and the specific gravity of the profile is reduced. The five heating zones of the screw barrel 2 are respectively set at 140 ℃, 150 ℃, 155 ℃, 160 ℃, 170 ℃ and the pressure is about 5-8bar, and are provided with pressure sensors for monitoring. The rotating speed of the screw is 50-60 r/min, the temperatures of three die head heating areas 3 are respectively set to 190 ℃, 195 ℃ and 200 ℃, the mixed materials are put into a hopper 1 of an extruder, the solid materials are converted into melt through the heating of a machine barrel and the shearing heat generated by the rotating speed output of the screw in the machine barrel, the molten materials are extruded to a die head 4 at the top of the machine barrel along with the rotation of the screw, the viscosity of the materials is increased due to the leap heating of the three die head heating areas 3, a foaming agent is enabled to be in a better state, the foaming agent generates a large amount of bubbles at a high temperature state, the materials are enabled to be expanded continuously, the melt passes through the die head 4 and enters a forming die 5 connected with the die head 4, refrigerant ethylene glycol with the temperature of minus 5 ℃ to minus 10 ℃ is conveyed by a water cooler with the temperature of minus 5 ℃ to minus 10 ℃ and enters a first inlet 11 of a circulating cooling channel through a refrigerant output pipe, The second refrigerant is introduced into the second refrigerant inlet 12, and is discharged from the first refrigerant outlet 111 and the second refrigerant outlet 14 to be cooled by circulation. At this moment, moulded die 5 receives the strong cold effect of 5 degrees below zero to 10 degrees below zero, the natural shrinkage, and inside material receives high temperature expansion, so the inner wall of fuse-element surface and die cavity 10 further becomes closely knit, the fuse-element surface receives the frozen effect of 5 degrees below zero to 10 degrees below zero, material surface heat is taken away rapidly, the bubble on surface meets cold disappearance, and the inside still high temperature state of material, the material stickness under the high temperature state strengthens, make the foamer at the inside stable foaming of material, the size and the distribution of bubble are more even. At this time, the surface temperature of the material is reduced, so that the surface of the melt begins to harden, and the material is preliminarily molded in the cavity 10. The cooling process in the cavity 10 is short, the molding is not stable enough, at this time, the product which is preliminarily molded is continuously extruded into the shaping mold 7 on the vacuum shaping table 6, the shaping mold 7 is further cooled, the shaping mold 7 is conveyed to refrigerant ethylene glycol with the temperature of minus 5 ℃ to minus 10 ℃ by a water cooling machine with the temperature of minus 5 ℃ to minus 10 ℃ for circulating cooling, meanwhile, the shaping mold 7 is vacuumized by a vacuum pump connected with an air hole 8 of a vacuumizing device, the attachment of the section bar in the shaping mold 7 and the inner wall of the shaping mold 7 is enhanced, the forced shrinkage is realized by rapidly freezing the shaping mold, the heat on the surface of the section bar in the mold is taken away again, the heat in the section bar is still conducted outwards to expand, and the forced shrinkage and the thermal expansion of the section bar are realized through the strong cold shrinkage of the shaping mold 7 and the thermal expansion in the section bar, the action of double pressure is realized, the attachment of the surface of the section bar in the shaping mold 7 and the inner wall of the cavity is more sufficient, due to the rapid reduction of the surface temperature, the foaming agent cannot generate bubbles on the surface of the low-temperature profile, and can only continue foaming in the high-temperature profile. The temperature in the section bar is conducted by the cold energy rapidly reduced on the surface, so that the temperature in the section bar is gradually reduced, the expansion degree generated by bubbles in the section bar is effectively fixed, the ideal foaming state is achieved, the surface of the section bar is smoother, the shaping is more stable, and the creep property of the product is improved. The shaped section bar is further cooled by the spray water tank 9, then the extruded section bar is drawn to a cutting device by a tractor to be cut, and after the section bar is cut, the section bar reaches the stacking skip frame, and the section bar is arranged by the stacking skip frame. For the forming die 5, the shaping die 7 and the low-temperature resistant plastic pipeline for conveying the refrigerant to enter and exit, in the circulating cooling process, the heat insulation material is wrapped, so that the temperature loss is reduced, and the energy-saving effect is achieved.

Claims (9)

1. A device for producing section bars by taking mixed recyclable waste plastics as raw materials comprises an extruder, a shaping device, a traction cutting device and a product stacking device, and is characterized in that the extruder mainly comprises an extruder hopper (1), a screw machine barrel (2) with a plurality of heating zones, a die head (4), a plurality of die head heating zones (3) arranged on the die head (4) and a forming die (5);

the extruder hopper (1) is arranged on the feeding input end of the screw machine barrel (2) and is used for feeding; the cooling device is characterized in that a plurality of heating zones of the screw machine barrel (2) are connected in sequence, a plurality of die head heating zones (3) are connected in sequence, the die head (4) is connected with the screw machine barrel (2), one end of the forming die (5) is connected with the die head (4), the other end of the forming die is connected with the forming device, and the forming device and the forming die (5) are respectively connected with an ultralow-temperature water chiller with the temperature of minus 5 ℃ to minus 10 ℃.

2. The apparatus for producing a profile from mixed recyclable waste plastic as described in claim 1, wherein the sizing apparatus comprises a spray water tank (9), a vacuum sizing table (6) and a sizing die (7); the shaping mold (7) and the spraying water tank (9) are sequentially arranged above the vacuum shaping table (6).

3. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in claim 2, wherein the stock mold (7) is composed of a plurality of sections of stock molds, and a circulation cooling passage is provided in the stock mold (7), and the circulation cooling passage is connected to a water chiller through a refrigerant inlet and outlet provided in the stock mold (7) to form a circulation cooling structure.

4. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in any one of claims 2 and 3, wherein a Teflon tape is stuck in the cavity of the sizing die (7).

5. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in claim 3, wherein the stock mold (7) is provided with evacuation means air holes (8).

6. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in claim 2, wherein the stock mold (7) and the shaping mold (5) are hermetically connected by a connecting pin.

7. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in claim 1, wherein the molding die (5) has a cavity (10) and a circulation cooling passage, which are connected to a water chiller through a refrigerant inlet and outlet.

8. The apparatus for producing a profile using mixed recyclable waste plastic as a raw material as set forth in claim 1, wherein the drawing and cutting apparatus is a drawing and cutting integrated machine, and the shaped product is drawn by a drawing machine, cut to length and cut.

9. The apparatus for producing profiles from mixed recyclable waste plastics as claimed in claim 1, wherein the product stacking means is a stacking hopper rack.

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