CN108381891B

CN108381891B - Manufacturing equipment for manufacturing PET wood-plastic composite material with sandwich structure

Info

Publication number: CN108381891B
Application number: CN201810369587.1A
Authority: CN
Inventors: 欧荣贤; 王清文; 易欣; 孙理超; 李丽萍; 谭伟; 吴江伟
Original assignee: South China Agricultural University
Current assignee: Guangdong Haipeng Bamboo Fiber New Material Technology Co.,Ltd.
Priority date: 2018-04-24
Filing date: 2018-04-24
Publication date: 2020-09-29
Anticipated expiration: 2038-04-24
Also published as: CN108381891A

Abstract

The invention belongs to the field of composite material preparation equipment, and particularly relates to equipment for preparing a PET (polyethylene terephthalate) wood-plastic composite material with a sandwich structure. The invention aims to overcome the problems of low strength, poor toughness, poor appearance and the like in the prior art by improving the structure of equipment. The equipment for manufacturing the PET wood-plastic composite material with the sandwich structure comprises control equipment, main extrusion equipment, auxiliary extrusion equipment and a die head for connecting the main extrusion equipment and the auxiliary extrusion equipment together, wherein the main extrusion equipment comprises power equipment, a transmission shaft, a machine barrel, a heating device, a feed hopper, a bracket and a platform base; the auxiliary extrusion equipment is provided with a power machine, a transmission rod, a threaded inner rod, a reaction cylinder, a heating device, an auxiliary material feeding hopper and a support. The equipment provided by the invention is used in the field of preparation of PET wood-plastic composite materials.

Description

Manufacturing equipment for manufacturing PET wood-plastic composite material with sandwich structure

Technical Field

The invention belongs to the field of wood-plastic composite material manufacturing equipment, relates to the field of PET wood-plastic composite material manufacturing equipment, and particularly relates to manufacturing equipment for manufacturing a PET wood-plastic composite material with a sandwich structure.

Background

The wood-plastic material is prepared from thermoplastic plastics and wood fiber, bamboo fiber or crop fiber, can fully utilize recycled plastics and agricultural and forestry wastes, and has good ecological benefit and economic benefit. The waste wood-plastic composite material can be produced again after being crushed, so that a recycling utilization mode is formed, and the requirements of developing recycling economy and building a conservation-oriented society are met. At present, wood-plastic composite materials are mostly prepared by compounding raw wood powder or wood fiber and plastics, and on one hand, the wood-plastic composite materials have high density, higher transportation cost and selling price and are not beneficial to popularization and use; on the other hand, the existing wood-plastic composite material has the defects of low strength, poor toughness and poor appearance effect.

Although wood-plastic materials have many advantages, there are many requirements for equipment for producing wood-plastic materials. The traditional extrusion equipment comprises single-screw extrusion equipment and double-screw extrusion equipment, and the product produced by the equipment is single and usually only has a one-layer structure, has the problems of low strength, poor toughness and poor aesthetics, and is not enough to meet the requirements of modern people. In addition, in extrusion plants, where different plastics are stacked on top of one another, as is often the case in practice, the properties of the plastics used in the individual extruders are not identical, in particular the viscosity of the materials is different or the flowability of the selected materials is different, and must therefore be balanced. The conventional method basically solves the above-mentioned disadvantages by chemically modifying the properties of the material itself.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned disadvantages of the background art by improving the structure of the apparatus, and provides an apparatus for manufacturing a PET wood plastic composite having a sandwich structure.

In order to achieve the purpose of the invention, the equipment for manufacturing the PET wood-plastic composite material with the sandwich structure, which is disclosed by the invention, is provided with control equipment, main extrusion equipment, auxiliary extrusion equipment and a die head for connecting the main extrusion equipment and the auxiliary extrusion equipment together, wherein the main extrusion equipment is provided with power equipment, a transmission shaft, a machine barrel, a heating device, a feed hopper, a bracket and a platform base; the power equipment is positioned on the platform base, a screw is arranged in the machine barrel, one end of the transmission shaft is connected with the screw, the other end of the transmission shaft is fixedly connected with the power equipment, and the heating device is wrapped on the periphery of the machine barrel; the power equipment is positioned at one end of the main extrusion equipment, which is provided with a transmission shaft, the other end of the main extrusion equipment is sequentially provided with a mixing section, a melting section, a homopolymerization section, a foaming agent injection section, a foaming section and a mixed cooling section, a die head is connected outside the mixed cooling section of the main extrusion equipment, and the feed hopper is positioned at the mixing section of the main extrusion equipment;

the auxiliary extrusion equipment is provided with a power machine, a transmission rod, a threaded inner rod, a reaction cylinder, a heating device, an auxiliary material inlet hopper and a support, the auxiliary extrusion equipment is fixed on the ground through the support, the power machine is connected with the threaded inner rod through the transmission rod, the reaction cylinder wrapping the threaded inner rod is arranged outside the threaded inner rod, the heating device is arranged outside the reaction cylinder, and the auxiliary material inlet hopper is positioned on the upper portion, close to one end of the power machine, of the reaction cylinder; the auxiliary extrusion equipment is connected with the side surface of the die head, and auxiliary materials processed by the auxiliary extrusion equipment are gathered into the die head.

Preferably, the heating device comprises an upper arc-shaped heating sheet and a lower arc-shaped heating sheet, and the upper arc-shaped heating sheet and the lower arc-shaped heating sheet are fixedly connected with the machine barrel or the reaction barrel through connecting pieces; the heating device is at least provided with a heating socket and a temperature detecting hole, and a heating power supply device is arranged at the heating socket and is electrically connected with the control equipment; and a temperature detector is arranged at the temperature probing hole and transmits a temperature signal to the control equipment.

Preferably, the control equipment at least comprises a first control box and a second control box, the first control box controls the heating temperature of the power equipment of the main extrusion equipment and the heating temperature of the heating device on the main extrusion equipment, and the second control box controls the heating temperature of the power machinery of the auxiliary extrusion equipment and the heating temperature of the heating device on the auxiliary extrusion equipment; the side surfaces of the outer walls of the first control box and the second control box are respectively provided with a transmission port and an aviation plug, the outsides of the first control box and the second control box are respectively provided with a temperature display, a temperature control button, a power display, a power control switch and a control switch of power equipment, and the temperature displays and the temperature control buttons are in one-to-one correspondence with the aviation plugs.

Preferably, the platform base is stepped, the power equipment is fixed at the higher position of the stepped platform base in a screw or welding mode, and other parts of the main extrusion equipment are fixed at the lower position of the stepped platform base through a support; the power equipment is an electric motor or a hydraulic motor.

Preferably, the die head has a main input end, an auxiliary input port and an output end, and the main input end is connected with the mixing and cooling section of the main extrusion equipment; the main input end of the die head is provided with an interface boss, the interface boss comprises an annular base body and an annular convex part, the annular base body and the annular convex part are integrally connected, the annular base body is connected with a machine barrel, the annular convex part is connected with a conical structure, a PET channel is arranged in the conical structure in a hollow mode, a flow groove and a contraction surface are arranged outside the conical structure, a die head shell capable of being tightly combined is sleeved outside the conical structure, the die head shell is hollow in the interior and provided with an inner wall capable of being obliquely reduced towards the direction of an output end, at least part of positions between the flow groove and the die head shell are not in contact with each other, the contraction surface and the die head shell are not in contact with each other, and a WPC channel is formed; the WPC channel forms a wrapping at least in part of the position outside the PET channel; the die head shell is provided with the auxiliary input port, and the auxiliary input port is communicated with the launder to form an auxiliary material channel.

Preferably, the tapered structure comprises a plurality of nested cones, and comprises at least a first cone and a second cone; the second taper body is provided with a second flow groove and a second contraction surface, at least part of the second flow groove is not in mutual contact with the first taper body, the second contraction surface is not in mutual contact with the first taper body, and a second WPC channel is formed among the second flow groove, the second contraction surface and the inner wall of the first taper body; the number of the auxiliary extrusion devices is at least two; the number of the auxiliary input ports on the die head shell is at least two, and at least one auxiliary input port is communicated with the first conical body and the second flow groove to form a second auxiliary material channel.

Preferably, a die body is arranged on one side of the die shell close to the output end, the die body is tightly combined with the die shell, and a cladding channel is arranged between the die body and the conical structure; a hollow spindle-shaped die tongue body is arranged in the PET channel, and one part of the outer side wall of the spindle-shaped die tongue body is tightly connected with the inner wall of the conical structure; a die lip body is also embedded in the die orifice body, and a coating layer channel is arranged between the die lip body and the die orifice body as well as between the die lip body and the spindle-shaped die tongue body as well as between the die lip body and the die orifice body; the output end of the die head is provided with a hollow groove-shaped structure, and the hollow groove-shaped structure is connected with the die orifice body and limits the position of the die lip body; the die tongue body and the die lip body can be replaced according to the requirement.

Preferably, the hollow first conical body is connected with the die head shell, and an annular bulge is arranged at the end part of the first conical body and connected with the annular convex part; a pore passage c is arranged between the middle position of the inclined surface of the first conical body and the inclined surface of the die head shell; the hollow second conical body is connected with the first conical body, the inclined surface of the second conical body is gentler than that of the first conical body, the end part of the second conical body is provided with a circular ring-shaped recess, and a pore channel d is arranged between the middle upper part of the inclined surface of the second conical body and the inclined surface of the first conical body; the spindle-shaped die tongue body is arranged in the second conical body; the inner wall of the second conical body close to the output end is provided with a gradually-widened inclined surface, the spindle-shaped die tongue body is provided with a long side end and a short side end, and the gradually-widened inclined surface is in close contact with the long side end of the spindle-shaped die tongue body.

Preferably, the inner through hole of the hollow groove-shaped structure is rectangular, circular or rounded rectangular.

Preferably, the main extrusion device further has a blowing agent feed port located at a blowing agent injection section of the main extrusion device.

Compared with the prior art, the invention has the advantages that:

the equipment for manufacturing the PET wood-plastic composite material with the sandwich structure provided by the invention can realize multi-layer co-extrusion, namely, the equipment has the sandwich structure, by arranging the main extrusion equipment and the auxiliary extrusion equipment, the structure can utilize waste plastics and the like on the inner layer and utilize high-performance materials on the outer layer, the stability of strength can be realized, and the cost can be reduced;

the die head structure provided by the invention is unique, layer-by-layer coating can be stably realized, and the attractiveness and the value of a product can be realized by adding different substances into different layers; in addition, the hollow groove-shaped structure at the outermost side of the die head is extruded to form a product with different shapes by changing the shape of the through hole in the die head, so that the attractiveness of the product is enhanced;

the invention solves the technical problems in a physical mode, reduces the complicated steps of a chemical method, saves time and realizes high efficiency and high speed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is an overall schematic view of the apparatus for manufacturing PET wood plastic composite with sandwich structure of the present invention;

FIG. 2 is a schematic side view of the apparatus for manufacturing PET wood plastic composite with sandwich structure of the present invention;

FIG. 3 is a general schematic view of the apparatus for manufacturing PET wood plastic composite with sandwich structure of the present invention;

FIG. 4 is a schematic drawing showing the disassembly of the die head of the apparatus of the present invention;

FIG. 5 is a general schematic view of the apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to the present invention;

FIG. 6 is a schematic drawing showing the disassembly of the die head of the apparatus of the present invention;

fig. 7 is a schematic disassembled view of the die head in the apparatus of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in when used, only for the purpose of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang", and the like, unless expressly stated or limited otherwise, do not imply a requirement that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

First embodiment

Referring to fig. 1, 2 and 3, the apparatus for manufacturing PET wood-plastic composite material with a sandwich structure, provided by the embodiment of the present invention, has a control apparatus 1, a main extrusion apparatus 2, an auxiliary extrusion apparatus 3 and a die head 4 connecting the main extrusion apparatus 2 and the auxiliary extrusion apparatus 3 together, wherein the main extrusion apparatus 2 has a power apparatus 21, a transmission shaft 22, a cylinder 23, a heating device 24, a feed hopper 25, a bracket 27 and a platform base 28; the power device 21 is positioned on the platform base 28, a screw is arranged in the machine barrel 23, one end of the transmission shaft 22 is connected with the screw, the other end of the transmission shaft is fixedly connected with the power device 21, and the heating device 24 is wrapped on the periphery of the machine barrel 23; the power equipment 21 is positioned at one end of the main extrusion equipment 2, which is provided with the transmission shaft 22, the other end of the main extrusion equipment 2 is sequentially provided with a mixing section, a melting section, a homopolymerization section, a foaming agent injection section, a foaming section and a mixing cooling section, the mixing cooling section of the main extrusion equipment 2 is externally connected with a die head 4, and the feed hopper 25 is positioned at the mixing section of the main extrusion equipment 2;

the auxiliary extrusion equipment 3 is provided with a power machine 31, a transmission rod 32, a threaded inner rod, a reaction cylinder 33, a heating device 24, an auxiliary material inlet hopper 34 and a support 27, the auxiliary extrusion equipment 3 is fixed on the ground through the support 27, the power machine 31 is connected with the threaded inner rod through the transmission rod 32, the threaded inner rod is externally provided with the reaction cylinder 33 wrapping the threaded inner rod, the reaction cylinder 33 is externally provided with the heating device 24, and the auxiliary material inlet hopper 34 is positioned on the upper part of the reaction cylinder 33, which is close to one end of the power machine 31; the auxiliary extrusion device 3 is connected with the side surface of the die head 4, and auxiliary materials processed by the auxiliary extrusion device 3 are gathered into the die head 4. It should be noted that the PET wood-plastic composite material with a sandwich structure can be manufactured by using the main extruder and the auxiliary extruder of the embodiment in combination, and a multi-layer structure can be generated, and different materials can be added at different layers to realize multiple effects of the composite material. For example, recycled plastic can be used as a substrate in the innermost layer, a reinforcing material can be used for improving the strength stability of the middle layer, and pigment is added in the outer layer, so that the cost can be reduced and the appearance is attractive.

The heating device 24 comprises an upper arc-shaped heating piece 24A and a lower arc-shaped heating piece 24B, and the upper arc-shaped heating piece 24A and the lower arc-shaped heating piece 24B are fixedly connected with the machine barrel 23 or the reaction barrel 33 through a connecting piece 24C; the heating device 24 at least has a heating socket 241 and a temperature probe hole 242, a heating power supply 243 is arranged at the heating socket 241, and the heating power supply 243 is electrically connected with the control device 1; a temperature detector 244 is provided at the temperature detection opening 242, and the temperature detector 244 transmits a temperature signal to the control device 1. It should be noted that, the heating device structure provided by this embodiment can be tightly connected with the barrel of the extruder, and the heating speed is fast and uniform.

Referring to fig. 3, the apparatus for manufacturing a PET wood-plastic composite material with a sandwich structure according to an embodiment of the present invention is different from the foregoing embodiment in that the control apparatus 1 at least includes a first control box 11 and a second control box 12, the first control box 11 controls heating temperatures of a power apparatus 21 of the main extrusion apparatus 2 and a heating device 24 on the main extrusion apparatus 2, and the second control box 12 controls heating temperatures of a power machine 31 of the auxiliary extrusion apparatus 3 and the heating device 24 on the auxiliary extrusion apparatus 3; the side surfaces of the outer walls of the first control box 11 and the second control box 12 are respectively provided with a transmission port 111 and an aviation plug 112, the outsides of the first control box 11 and the second control box 12 are respectively provided with a temperature display, a temperature control button, a power display, a power control switch and a control switch of power equipment, and the temperature display and the temperature control button are in one-to-one correspondence with the aviation plug. It should be noted that, the control device provided by this embodiment can avoid the leakage of the electric wire, and realize the neat and well-controlled function. In addition, the running and heating conditions of the power equipment and the heating device can be accurately controlled by arranging a plurality of displays and control buttons.

Second embodiment

Referring to fig. 1, 2, 3 and 5, another apparatus for manufacturing PET wood-plastic composite with a sandwich structure is provided according to an embodiment of the present invention. As shown in fig. 1, 2, 3 and 5, the platform base 28 is stepped, the power device 21 is fixed at a higher position of the stepped platform base 28 by screws or welding, and other parts of the main extrusion device 2 are fixed at a lower position of the stepped platform base 28 by a bracket 27; the power device 21 is an electric motor or a hydraulic motor. It should be noted that, the platform base with such a structure can stably fix the main extruder to enhance the safety of the main extruder.

Third embodiment

Referring to fig. 4, 6 and 7, another apparatus for manufacturing PET wood-plastic composite with a sandwich structure is provided according to an embodiment of the present invention. As shown in fig. 4, 6 and 7, the die head 4 has a main input port 4a, an auxiliary input port 4b and an output port 4c, and the main input port 4a is connected to the mixing and cooling section of the main extrusion device 2; the main input end 4a of the die head 4 has an interface boss 41, the interface boss 41 includes an annular base 411 and an annular protrusion 412, the annular base 411 is integrally connected with the annular protrusion 412, the annular base 411 is connected with the cylinder 23, the annular convex part 412 is connected with the conical structure 42, the conical structure 42 is internally hollow and is provided with a PET channel 421, the outer part of the conical structure is provided with a flow groove 422 and a contraction surface 423, the conical structure 42 is externally sleeved with a die shell 43 which can be tightly combined, the interior of the die shell 43 is hollow, the inner wall 431 with the inclination decreasing towards the output end 4c is arranged, at least a portion of the flow channels 422 and the die housing 43 are not in contact with each other, the converging surface 423 and the die housing 43 are not in contact with each other, WPC channel 424 is formed between the flow slot 422, constriction 423 and inner wall 431 of die housing 43; the WPC channel 424 forms a wrap at least in a partial position outside the PET channel 421; the die head shell 43 is provided with the auxiliary input port 4b, and the auxiliary input port 4b is communicated with the flow groove 422 to form an auxiliary material channel 432. It should be noted that the die head structure provided by the present embodiment is unique, and the main extruder and the auxiliary extruder can be simply and quickly connected together by using the die head. The channel 424 is a flow channel of an auxiliary extruder, the extruded substance passes through the PET channel 421 first, and then passes through the channel 424, and the substance coming out of the channel 424 can cover the substance coming out of the PET channel 421 to form a two-layer structure.

Wherein the tapered structure 42 comprises a plurality of nested cones, and comprises at least a first cone 42a and a second cone 42 b; second runner 425 and second converging surface 426 are formed on second conical body 42b, at least a portion of second runner 425 and first conical body 42a are not in contact with each other, second converging surface 426 and first conical body 42a are not in contact with each other, and second WPC channel 427 is formed between second runner 425, second converging surface 426 and the inner wall of first conical body 42 a; the number of the auxiliary extrusion devices 3 is at least two; at least two auxiliary input ports 4b are formed on the die head housing 43, and at least one of the auxiliary input ports 4b is communicated with the first conical body 42a and the second flow groove 425 to form a second auxiliary material channel 433. It should be noted that another auxiliary extruder can be connected to the entire runner through the second runner 425 and the second WPC channel 427 of this embodiment, so as to realize layer-by-layer cladding of the composite material.

Referring to fig. 4, an embodiment of the present invention provides an apparatus for manufacturing a PET wood plastic composite having a sandwich structure. The apparatus for manufacturing PET wood-plastic composite material with sandwich structure, different from any embodiment of the first and second embodiments, is that a die body 45 is provided on one side of the die housing 43 close to the output end 4c, the die body 45 is tightly combined with the die housing 43, and a cladding channel 451 is provided between the die body 45 and the conical structure 42; a hollow spindle-shaped die tongue body 46 is arranged in the PET channel 421, and a part of the outer side wall of the spindle-shaped die tongue body 46 is tightly connected with the inner wall of the conical structure 42; a die lip body 47 is embedded in the die opening body 45, and a coating layer channel 48 is arranged between the die lip body 47 and the spindle-shaped die tongue body 46 as well as between the die opening body 45; a hollow groove-shaped structure 49 is arranged at the output end 4c of the die head 4, and the hollow groove-shaped structure 49 is connected with the die opening body 45 and limits the position of the die lip body 47; the die tongue body 46 and the die lip body 47 can be replaced according to the requirement. It should be noted that the structure provided in this embodiment realizes a process of merging substances from the main extruder and the auxiliary extruder into a whole and performing cooling molding.

Referring to fig. 7, an embodiment of the present invention provides an apparatus for manufacturing a PET wood plastic composite having a sandwich structure. The apparatus for manufacturing PET wood-plastic composite material with sandwich structure, different from any embodiment of the first and second embodiments, is that the hollow first conical body 42a is connected with the die head housing 43, and the end of the first conical body 42a is provided with a circular ring-shaped protrusion 428, and the circular ring-shaped protrusion 428 is connected with the circular ring-shaped protrusion 412; a hole c is arranged between the middle position of the inclined surface of the first conical body 42a and the inclined surface of the die head shell 43; connected with the first taper body 42a is a hollow second taper body 42b, the slope of the second taper body 42b is gentler than that of the first taper body 42a, the end part of the second taper body 42b is provided with a circular ring shaped recess, and a pore canal d is arranged between the middle upper position of the slope of the second taper body 42b and the slope of the first taper body 42 a; the spindle-shaped die tongue body 46 is provided inside the second taper body 42 b; the inner wall of the second taper 42b near the output end 4c has a gradually widened slope, and the spindle die tongue 46 has a long side end and a short side end, and the gradually widened slope is in close contact with the long side end of the spindle die tongue 46. The duct c and the duct d are runners of the auxiliary extruder.

Fourth embodiment

Referring to fig. 1, 2, 3, 4 and 5, an embodiment of the present invention provides an apparatus for manufacturing a PET wood plastic composite having a sandwich structure. The apparatus for manufacturing PET wood-plastic composite material with sandwich structure is different from any one of the first to third embodiments in that the inner through hole of the hollow groove-shaped structure 49 is rectangular, circular or rounded rectangular. The composite material formed by extrusion molding can be in different shapes in appearance, and the appearance is improved.

Fifth embodiment

Referring to fig. 1, 2, 3 and 5, an embodiment of the present invention provides an apparatus for manufacturing a PET wood plastic composite having a sandwich structure. The apparatus for manufacturing the PET wood-plastic composite material with the sandwich structure is different from any one of the embodiments of the first to third embodiments in that the main extrusion apparatus 2 further has a foaming agent feed port 26, and the foaming agent feed port 26 is located at a foaming agent injection section of the main extrusion apparatus 2. It should be noted that, the function of one machine for multiple purposes can be realized through the foaming agent feed inlet that increases of this embodiment, saves cost when realizing the maximize utilization of machine.

In conclusion, the equipment for manufacturing the PET wood-plastic composite material with the sandwich structure can realize the co-extrusion of multiple layers, not only can the stability of the strength be realized, but also the cost can be reduced; the die head structure provided by the invention is unique, layer-by-layer coating can be stably realized, and the product extruded by changing the shape of the through hole in the hollow groove-shaped structure at the outermost side of the die head is different in shape, so that the attractiveness of the product is enhanced.

It should be understood that the above-described specific embodiments and examples of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. The equipment for manufacturing the PET wood-plastic composite material with the sandwich structure comprises a control device (1), a main extrusion device (2), an auxiliary extrusion device (3) and a die head (4) for connecting the main extrusion device (2) and the auxiliary extrusion device (3), wherein the main extrusion device (2) is provided with a power device (21), a transmission shaft (22), a machine barrel (23), a heating device (24), a feed hopper (25), a bracket (27) and a platform base (28); the power equipment (21) is positioned on the platform base (28), a screw is arranged in the machine barrel (23), one end of the transmission shaft (22) is connected with the screw, the other end of the transmission shaft is fixedly connected with the power equipment (21), and the heating device (24) is wrapped on the periphery of the machine barrel (23); the power equipment (21) is positioned at one end of the main extrusion equipment (2) provided with the transmission shaft (22), the other end of the main extrusion equipment (2) is sequentially provided with a mixing section, a melting section, a homopolymerization section, a foaming agent injection section, a foaming section and a mixed cooling section, a die head (4) is connected outside the mixed cooling section of the main extrusion equipment (2), and the feed hopper (25) is positioned at the mixing section of the main extrusion equipment (2);

the auxiliary extrusion equipment (3) is provided with a power machine (31), a transmission rod (32), a threaded inner rod, a reaction cylinder (33), a heating device (24), an auxiliary material inlet hopper (34) and a support (27), the auxiliary extrusion equipment (3) is fixed on the ground through the support (27), the power machine (31) is connected with the threaded inner rod through the transmission rod (32), the threaded inner rod is externally provided with the reaction cylinder (33) wrapping the threaded inner rod, the reaction cylinder (33) is externally provided with the heating device (24), and the auxiliary material inlet hopper (34) is positioned on the upper portion, close to one end of the power machine (31), of the reaction cylinder (33); supplementary extrusion equipment (3) are connected with the side of mould head (4) to make the auxiliary material of handling through supplementary extrusion equipment (3) converge into mould head (4), its characterized in that: the die head (4) is provided with a main input end (4a), an auxiliary input end (4b) and an output end (4c), and the main input end (4a) is connected with a mixing and cooling section of the main extrusion device (2); the main input end (4a) of the die head (4) is provided with an interface boss (41), the interface boss (41) comprises an annular base body (411) and an annular convex part (412), the annular base body (411) is integrally connected with the annular convex part (412), the annular base body (411) is connected with the cylinder (23), the annular convex part (412) is connected with a conical structure (42), the conical structure (42) is internally hollow and provided with a PET channel (421), the outer part of the conical structure is provided with a flow groove (422) and a contraction surface (423), the conical structure (42) is externally sleeved with a die head shell (43) capable of being tightly combined, the die head shell (43) is internally hollow and provided with an inner wall (431) with a reduced inclination towards the direction of the output end (4c), at least part of the flow groove (422) and the die head shell (43) are not contacted with each other, and the contraction surface (423) and the die head shell (43) are, a WPC channel (424) is formed between the flow slot (422), a converging surface (423), and an inner wall (431) of the die housing (43); the WPC channel (424) forms a wrap at least in part outside the PET channel (421); the die head shell (43) is provided with the auxiliary input port (4b), the auxiliary input port (4b) is communicated with the flow groove (422) to form an auxiliary material channel (432), the conical structure (42) comprises a plurality of nested shapes and at least comprises a first conical body (42a) and a second conical body (42 b); the second conical body (42b) is provided with a second flow groove (425) and a second contraction surface (426), at least part of the second flow groove (425) and the first conical body (42a) are not in mutual contact, the second contraction surface (426) and the first conical body (42a) are not in mutual contact, and a second WPC channel (427) is formed among the second flow groove (425), the second contraction surface (426) and the inner wall of the first conical body (42 a); the number of the auxiliary extrusion devices (3) is at least two; the number of the auxiliary input ports (4b) on the die head shell (43) is at least two, at least one auxiliary input port (4b) is communicated with the first conical body (42a) and the second flow groove (425) to form a second auxiliary material channel (433), the second WPC channel (427) is located between the WPC channel (424) and the PET channel (421), the WPC channel (424) is communicated with the second WPC channel firstly and then communicated with the PET channel (421), the auxiliary materials of the WPC channel (424) are compounded on the outer surface of the auxiliary materials of the second WPC channel (427), and two layers of auxiliary materials are compounded on the outer surface of the material flowing out through the PET channel (421).

2. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to claim 1, characterized in that: the heating device (24) comprises an upper arc-shaped heating sheet (24A) and a lower arc-shaped heating sheet (24B), and the upper arc-shaped heating sheet (24A) and the lower arc-shaped heating sheet (24B) are fixedly connected with the machine barrel (23) or the reaction barrel (33) through a connecting piece (24C); the heating device (24) is at least provided with a heating socket (241) and a temperature probe hole (242), a heating power supply device (243) is arranged at the heating socket (241), and the heating power supply device (243) is electrically connected with the control equipment (1); a temperature detector (244) is arranged at the temperature detection hole (242), and the temperature detector (244) transmits a temperature signal to the control device (1).

3. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to claim 1, characterized in that: the control equipment (1) at least comprises a first control box (11) and a second control box (12), the first control box (11) controls the heating temperatures of a power device (21) of the main extrusion equipment (2) and a heating device (24) on the main extrusion equipment (2), and the second control box (12) controls the heating temperatures of a power machine (31) of the auxiliary extrusion equipment (3) and the heating device (24) on the auxiliary extrusion equipment (3); all have transmission mouth (111) and aviation plug (112) on the outer wall side of first control box (11) and second control box (12) the outside of first control box (11) and second control box (12) all has temperature display, temperature control button, power display, power control switch and power equipment's control switch, temperature display and temperature control button and aviation plug one-to-one.

4. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to claim 1, characterized in that: the power equipment (21) is fixed at the higher position of the stepped platform base (28) in a screw or welding mode, and other parts of the main extrusion equipment (2) are fixed at the lower position of the stepped platform base (28) through a bracket (27); the power equipment (21) is an electric motor or a hydraulic motor.

5. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to any one of claims 1 to 4, wherein: the die head shell (43) is provided with a die head body (45) at one side close to the output end (4c), the die head body (45) is tightly combined with the die head shell (43) and a cladding channel (451) is arranged between the die head body and the conical structure (42); a hollow spindle-shaped die tongue body (46) is arranged in the PET channel (421), and one part of the outer side wall of the spindle-shaped die tongue body (46) is tightly connected with the inner wall of the conical structure (42); a die lip body (47) is also embedded in the die opening body (45), and a coating layer channel (48) is arranged between the die lip body (47) and the spindle-shaped die tongue body (46) as well as between the die opening body (45); a hollow groove-shaped structure (49) is arranged at the output end (4c) of the die head (4), and the hollow groove-shaped structure (49) is connected with the die opening body (45) and limits the position of the die lip body (47); the die tongue body (46) and the die lip body (47) can be replaced according to the requirement.

6. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to claim 5, characterized in that: the first hollow conical body (42a) is connected with the die head shell (43), an annular bulge (428) is arranged at the end part of the first conical body (42a), and the annular bulge (428) is connected with the annular convex part (412); a duct c is arranged between the middle position of the inclined surface of the first conical body (42a) and the inclined surface of the die head shell (43); the hollow second conical body (42b) is connected with the first conical body (42a), the inclined surface of the second conical body (42b) is gentler than that of the first conical body (42a), a circular ring-shaped recess is arranged at the end part of the second conical body (42b), and a pore channel d is arranged between the middle upper part of the inclined surface of the second conical body (42b) and the inclined surface of the first conical body (42 a); the spindle-shaped die tongue body (46) is arranged inside the second conical body (42 b); the inner wall of the second conical body (42b) close to the output end (4c) is provided with a gradually widened inclined surface, the spindle-shaped die tongue body (46) is provided with a long side end and a short side end, and the gradually widened inclined surface is in close contact with the long side end of the spindle-shaped die tongue body (46).

7. The apparatus for manufacturing a PET wood plastic composite with a sandwich structure according to claim 5, characterized in that: the inner through hole of the hollow groove-shaped structure (49) is rectangular, circular or round-corner rectangular.

8. The apparatus for manufacturing a PET wood-plastic composite material having a sandwich structure according to claim 1 or 2, wherein: the main extrusion device (2) is also provided with a foaming agent feeding hole (26), and the foaming agent feeding hole (26) is positioned at a foaming agent injection section of the main extrusion device (2).