Foaming product and processing technology and device thereof

Abstract

The invention belongs to the technical field of foamed plastics, and particularly relates to a foamed product and a processing technology and device thereof.The foamed product comprises an extruder barrel, an extrusion screw is rotationally installed in the extruder barrel, the foamed product further comprises a dispersing and adding assembly, and the dispersing and adding assembly is installed on the extruder barrel; the dispersing and adding assembly is used for dispersing and adding a foaming agent into polyolefin; by arranging the dispersing and adding assembly, foaming agent particles are conveyed through the conveying needles which are small in diameter and are uniformly dispersed, then the foaming agent particles are retained in the insertion holes formed by the conveying needles, and the dispersing degree of the foaming agent particles during adding can be effectively enhanced by increasing the density and the dispersing degree of the insertion holes; the stirring and mixing effects of the extruder barrel and the extrusion screw rod are matched, so that the dispersion uniformity of the foaming agent particles in the raw materials can be effectively enhanced, and the bubbles in the prepared foaming product are uniformly dispersed.

Description

Technical Field

[0001] The invention belongs to the technical field of foamed plastics, in particular to a foamed product and a processing technology and device thereof. Background Art

[0002] Polyolefin foam building materials refer to plastics such as polyethylene and polypropylene, which are added with inorganic filler masterbatches, weather-resistant masterbatches, color masterbatches, foaming agents and regulators, and are mixed, melt-extruded, molded, cooled and cut into profiles. Polyolefin foam building materials are non-toxic, environmentally friendly and have excellent performance, so they are widely used in the construction industry.

[0003] Continuous extrusion foaming is one of the production processes of polyolefin foamed building materials. Since the continuous extrusion foaming process has the advantages of high production efficiency and stable product quality, it is widely used. In the continuous extrusion foaming process, the plastic particles and the foaming agent need to be mixed first, and then heated and stirred, so that the foaming agent can be evenly distributed in the polyolefin in the molten state. However, in actual application, it is found that, on the one hand, the particle sizes of polyolefin and the foaming agent are different, and the stirring resistance of polyolefin in the hot melt state is large, which makes it difficult to disperse the foaming agent in the polyolefin. On the other hand, since the foaming agent has a certain hygroscopic effect, and the foaming agent particles are easily agglomerated under the action of static electricity, it is further difficult to disperse the foaming agent in the polyolefin.

[0004] The related technology discloses a foamed polypropylene masterbatch extrusion equipment, application number CN2023113622261. This scheme sets a grinding chamber in the extruder, and the extrusion screw cooperates with the grinding chamber to shear and grind the raw materials into small particles. At the same time, the extrusion screw drives the grinding roller to rotate, and the grinding roller cooperates with the grinding box to grind the foaming agent. The ground foaming agent is mixed with the raw material to make the mixing more uniform. However, in actual application, it is found that since the texture of hot-melt polyolefin is relatively viscous, it is not convenient to quickly disperse the powdered foaming agent when adding it to the polyolefin.

[0005] In view of this, the present invention proposes a foaming product and a processing technology and device thereof to solve the above technical problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a foaming product and a processing technology and device thereof.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a foaming product processing device described in the present invention comprises an extruder barrel, in which an extrusion screw is rotatably installed, and the interior of the extruder barrel is sequentially divided into a solid conveying section, a melting section and a melt conveying section;

[0008] It also includes a dispersing and adding component, which is installed on the extruder barrel and is used to disperse and add the foaming agent into the polyolefin;

[0009] The dispersing and adding assembly comprises a connecting shell, a driving roller and a conveying needle;

[0010] A communication shell is fixedly mounted on the extruder barrel, the communication shell is aligned with the melt conveying section, and the communication shell is conductively connected to the inner cavity of the extruder barrel;

[0011] A driving roller is rotatably installed in the communicating shell, the driving roller is externally connected to a driving motor, a storage cavity is provided in the driving roller, and a material pipe is installed on the communicating shell for conveying foaming agent particles into the storage cavity;

[0012] The driving roller is provided with evenly distributed mounting holes, the conveying needle is installed on the driving roller through the mounting holes, and the conveying needle is provided with evenly distributed micro grooves;

[0013] It also includes a forced telescopic component, which is installed on the connecting shell and is used to drive the delivery needle to reciprocate inside and outside the storage cavity.

[0014] Preferably, a scraper ring is fixedly installed at the connection point between the mounting hole and the storage cavity, and a baffle is fixedly installed at the connection point between the connecting shell and the inner cavity of the extruder barrel.

[0015] Preferably, the dispersing and adding components are provided in multiple groups, and the multiple groups of dispersing and adding components are evenly arranged along the spiral direction of the extrusion screw.

[0016] Preferably, the forced telescopic assembly comprises a special-shaped rod, an assembly plate and a sliding column;

[0017] The special-shaped rod is fixedly mounted on the connecting shell, the special-shaped rod extends into the storage cavity, and a limiting groove is provided at one end of the special-shaped rod located in the storage cavity;

[0018] The delivery needles are divided into multiple groups, and the delivery needles in the same group are fixedly connected by an assembly plate;

[0019] A sliding column is fixedly mounted on one end of the assembly plate facing the special-shaped rod, and the sliding column extends into the limiting groove.

[0020] Preferably, a separator ring is fixedly installed in the storage chamber, the separator ring driving roller is coaxially designed, the foaming agent particles are located between the separator ring and the inner wall of the storage chamber, and the delivery needle passes through the separator ring.

[0021] Preferably, the delivery needle is composed of a needle tube and an elastic sheet, the needle tube is a hollow tubular structure with holes evenly opened on the surface, an elastic sheet is fixedly mounted on the inner wall of the needle tube, and the elastic sheet is made of a high temperature resistant elastic material.

[0022] Preferably, a pressure regulating tube is fixedly installed on the assembly plate, and the pressure regulating tube is conductively connected to the corresponding inner cavity of the needle tube. A compressor, a condenser and an expansion valve are installed on the connecting shell. The compressor, the expansion valve, the pressure regulating tube, the needle tube and the condenser constitute a refrigeration system for cooling the needle tube.

[0023] Preferably, the elastic sheet protrudes toward the outside of the needle tube in an initial state.

[0024] A foaming product processing technology, the process comprising the following steps:

[0025] S1: The polyolefin raw material is conveyed into the excessive homogenization bin by negative pressure suction and heated in the excessive homogenization bin;

[0026] S2: HDPE, filler masterbatch, color masterbatch and weather-resistant masterbatch are loaded into the mixer according to the proportion, and are transported to the transition silo after the mixing is completed. Under the action of negative pressure transportation, they are continuously fed into the extruder barrel;

[0027] S3: The raw materials are transported, heated and stirred in the extruder barrel under the conveyance of the extrusion screw. When the molten raw materials are conveyed to the melt conveying section, the dispersing and adding components cooperate with the forced telescopic components to evenly disperse the foaming agent in the raw materials;

[0028] S4: After the raw materials and the foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw, and then extruded through the extruder head at the end of the extruder barrel. After being shaped and cooled in the mold, they are pulled, cut, processed and assembled to form the finished product.

[0029] A foamed product, comprising a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer form a three-layer overlapping structure;

[0030] The core layer is composed of the following materials:

[0031] HDPE 84.3%;

[0032] Filler masterbatch 10%;

[0033] Masterbatch 3%;

[0034] Foaming agent regulator 0.15%;

[0035] Foaming agent 0.25%;

[0036] Polymer dispersant 0.3%;

[0037] Weathering masterbatch 2%;

[0038] The core layer is made of the following materials:

[0039] HDPE, wear-resistant resin and scratch-resistant resin together account for 96.7%;

[0040] Masterbatch 3%;

[0041] Wood grain masterbatch 0.3%.

[0042] The beneficial effects of the present invention are as follows:

[0043] 1. The foaming product and its processing technology and device described in the present invention, by setting a dispersion and addition component, uses a small diameter and evenly dispersed conveying needle to transport the foaming agent particles, so that the foaming agent particles are retained in the insertion hole formed by the conveying needle. By increasing the density and dispersion of the insertion hole, the dispersion degree of the foaming agent particles during addition can be effectively enhanced. In combination with the stirring and mixing action of the extruder barrel and the extrusion screw, the dispersion uniformity of the foaming agent particles in the raw material can be effectively enhanced, so that the bubbles in the manufactured foaming product are evenly dispersed.

[0044] 2. The foaming product and its processing technology and device described in the present invention can gradually solidify the molten raw material in contact with the delivery needle through continuous cooling of the delivery needle, thereby reducing the difficulty of separating the delivery needle from the raw material. Moreover, since the heat absorption efficiency of the delivery needle is improved when it is in the molten raw material, the volatilization rate of the refrigerant is accelerated, thereby reducing the refrigeration effect of the delivery needle. At this time, the elastic sheet inside the needle tube expands under the action of thermal expansion and contraction, thereby pushing the foaming agent particles out of the microgroove. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Figure 1 is a stereogram of the present invention;

[0047] Figure 2 is a stereogram of a dispersed addition assembly in the present invention;

[0048] Figure 3 It is a stereogram of another viewing angle of the dispersed addition component in the present invention;

[0049] Figure 4 It is a diagram of the internal structure of the connected shell;

[0050] Figure 5 It is a stereogram of a special-shaped rod;

[0051] Figure 6 is a stereogram of the driving roller;

[0052] Figure 7 It is the assembly drawing of the conveying needle and the assembly plate;

[0053] Figure 8 is a cross-sectional view of a delivery needle;

[0054] Fig. 9 is a partial cross-sectional view of the present invention;

[0055] Fig.10 yes Fig. 9 A partial enlarged view of the middle A;

[0056] Fig.11 Flow chart of the method of the present invention;

[0057] In the figure: 1, extruder barrel; 11, solid conveying section; 12, melting section; 13, melt conveying section; 2, connecting shell; 21, driving roller; 22, storage chamber; 23, material pipe; 24, mounting hole; 25, conveying needle; 26, micro groove; 27, needle tube; 28, elastic sheet; 3, scraper ring; 31, baffle; 4, special-shaped rod; 41, limit groove; 42, assembly plate; 43, sliding column; 5, separation ring; 6, pressure regulating pipe; 61, compressor; 62, condenser; 63, expansion valve. DETAILED DESCRIPTION

[0058] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0059] like Figures 1 to 10 As shown, a foaming product processing device according to the present invention comprises an extruder barrel 1, in which an extrusion screw is rotatably installed, and the interior of the extruder barrel 1 is sequentially divided into a solid conveying section 11, a melting section 12 and a melt conveying section 13;

[0060] It also includes a dispersing and adding component, which is installed on the extruder barrel 1 and is used to disperse and add the foaming agent into the polyolefin;

[0061] The dispersing and adding assembly includes a connecting shell 2, a driving roller 21 and a conveying needle 25;

[0062] A communication housing 2 is fixedly mounted on the extruder barrel 1, the communication housing 2 is aligned with the melt conveying section 13, and the communication housing 2 is conductively connected to the inner cavity of the extruder barrel 1;

[0063] A driving roller 21 is rotatably installed in the communicating shell 2, and the driving roller 21 is externally connected to a driving motor. A storage chamber 22 is provided in the driving roller 21, and a material pipe 23 is installed on the communicating shell 2 for conveying foaming agent particles into the storage chamber 22;

[0064] The driving roller 21 is provided with evenly distributed mounting holes 24, and the conveying needle 25 is mounted on the driving roller 21 through the mounting holes 24. The conveying needle 25 is provided with evenly distributed micro grooves 26;

[0065] It also includes a forced telescopic assembly, which is mounted on the communicating housing 2 and is used to drive the delivery needle 25 to reciprocate inside and outside the storage chamber 22;

[0066] In the continuous extrusion foaming process, plastic particles are fed into the loading bin provided on the extruder barrel 1. Under the action of gravity, the raw materials will automatically flow into the extruder barrel 1, and the extrusion screw driven by the power device will rotate synchronously. When the extrusion screw rotates, the friction force is used to push the raw materials to move, heat and melt in the extruder barrel 1. In this process, the foaming agent particles are dispersed and added to the molten raw materials through the dispersion and addition component, and the stirring effect of the extrusion screw on the molten raw materials is combined, thereby effectively reducing the difficulty of uniformly mixing the foaming agent and the plastic raw materials.

[0067] Specifically, under the conveying action of the extrusion screw, the plastic raw material enters the solid conveying section 11, the melting section 12 and the melt conveying section 13 in the extruder barrel 1 in sequence. In the solid conveying section 11, the solid plastic raw material is compacted by the action of the inner wall of the extruder barrel 1 and the extrusion screw, and then the raw material after preliminary compaction enters the melting section 12, which is also called the compression section. During transportation, the raw material is further compacted and plasticized, and the air entrained in the plastic is pressed back to the upper hopper and discharged to the outside. At the same time, the raw material is continuously subjected to external heating from the extruder barrel 1 and the stirring, mixing and shearing action of the extrusion screw and the barrel. When the raw material is conveyed to the melt conveying section 13, the raw material has been completely converted from a solid state to a molten state. During transportation in this section, the drive roller 21 is driven by an external drive motor to maintain the same movement speed as the raw material, driving The delivery needle 25 installed on the moving roller 21, in the process of rotation, cooperates with the forced telescopic component, and successively experiences the cyclic motion of inserting the raw material, pulling out the raw material, and shrinking to the storage chamber 22. During the cyclic motion of the delivery needle 25, when the delivery needle 25 is in the storage chamber 22, the foaming agent particles adhere to the microgrooves 26 on the surface of the delivery needle 25, and then follow the delivery needle 25 to be inserted into the raw material. Under the viscosity of the raw material, when the delivery needle 25 is separated from the raw material, the foaming agent particles in the microgrooves 26 are retained in the raw material. Under the continuous rotation of the driving roller 21, a large number of delivery needles 25 form uniform jacks in the raw material, so that the foaming agent is dispersed and added in the raw material. Then, when the raw material continues to move, it will be stirred, mixed and sheared by the extrusion screw and the extruder barrel 1 again, so that the foaming agent particles are dispersed in the raw material.

[0068] The present invention provides a dispersion and addition component, and utilizes a delivery needle 25 with a smaller diameter and uniform dispersion to transport the foaming agent particles, so that the foaming agent particles are retained in the insertion hole formed by the delivery needle 25. By increasing the density and dispersion of the insertion hole, the dispersion degree of the foaming agent particles during addition can be effectively enhanced. In combination with the stirring and mixing action of the extruder barrel 1 and the extrusion screw, the dispersion uniformity of the foaming agent particles in the raw material can be effectively enhanced, so that the bubbles in the manufactured foamed product are uniformly dispersed.

[0069] As a preferred embodiment of the present invention, a scraper ring 3 is fixedly installed at the connection point between the mounting hole 24 and the storage cavity 22 , and a baffle 31 is fixedly installed at the connection point between the connecting shell 2 and the inner cavity of the extruder barrel 1 .

[0070] The scraper ring 3 and the baffle 31 are arranged to prevent the molten raw material from flowing into the storage chamber 22 and the inner cavity of the communicating shell 2 on the one hand, and to scrape the surface of the delivery needle 25 on the other hand, thereby intercepting the foaming agent particles on the surface of the delivery needle 25, and the foaming agent particles in the microgrooves 26 on the surface of the delivery needle 25 can be carried, so that the content of the foaming agent particles carried by the delivery needle 25 during a single transportation process is relatively fixed, and the uniformity of the addition of the foaming agent particles can be effectively enhanced by combining the number of delivery needles 25 and the density of the jacks.

[0071] As a preferred embodiment of the present invention, the dispersing and adding components are provided in multiple groups, and the multiple groups of dispersing and adding components are evenly arranged along the spiral direction of the extrusion screw.

[0072] The arrangement of multiple groups of dispersing and adding components can contact the molten raw materials between the extruder barrel 1 and the extrusion screw from different angles, thereby reducing the dead angle of foaming agent addition and enhancing the uniformity of foaming agent addition.

[0073] As a preferred embodiment of the present invention, the forced telescopic assembly includes a special-shaped rod 4, an assembly plate 42 and a sliding column 43;

[0074] The special-shaped rod 4 is fixedly mounted on the connecting housing 2, and the special-shaped rod 4 extends into the storage cavity 22. A limiting groove 41 is formed at one end of the special-shaped rod 4 located in the storage cavity 22;

[0075] The delivery needles 25 are divided into multiple groups, and the delivery needles 25 in the same group are fixedly connected by an assembly plate 42;

[0076] A sliding post 43 is fixedly mounted on one end of the assembly plate 42 facing the special-shaped rod 4 , and the sliding post 43 extends into the limiting groove 41 .

[0077] During the continuous addition of the foaming agent, as the driving roller 21 rotates continuously, the special-shaped rod 4 fixedly mounted on the communicating shell 2 generates relative motion with the driving roller 21. Since the conveying needles 25 are divided into multiple groups, and the conveying needles 25 of the same group are fixedly connected by the assembly plate 42, and the assembly plate 42 is connected to the special-shaped rod 4 through the slide column 43 and the limit groove 41, the rotation of the driving roller 21 drives the conveying needle 25 to rotate, thereby generating relative motion between the assembly plate 42 and the special-shaped rod 4. At this time, the slide column 43 slides in the limit groove 41. During the sliding process, since the special-shaped rod 4 is in contact with the driving roller 21 in the circumferential direction, the conveying needles 25 of the same group are fixedly connected by the assembly plate 42, and the assembly plate 42 is connected to the special-shaped rod 4 through the slide column 43 and the limit groove 41. The spacing between the rollers 21 is different, so the sliding column 43 is pushed and pulled, and the distance between the axial center of the assembly plate 42 and the driving roller 21 changes. When the axial distance between the assembly plate 42 and the driving roller 21 increases, the delivery needle 25 moves from the storage cavity 22 to the inner cavity of the extruder barrel 1, and when the axial distance between the assembly plate 42 and the driving roller 21 decreases, the delivery needle 25 moves from the inner cavity of the extruder barrel 1 to the storage cavity. In the process of periodic extension and contraction of the delivery needle 25, the delivery needle 25 continuously delivers the foaming agent particles to the molten raw material through the microgrooves 26 on the surface, thereby realizing continuous addition of the foaming agent.

[0078] As a preferred embodiment of the present invention, a separator ring 5 is fixedly installed in the storage chamber 22 , the separator ring 5 is coaxially designed to drive the roller 21 , the foaming agent particles are located between the separator ring 5 and the inner wall of the storage chamber 22 , and the delivery needle 25 passes through the separator ring 5 .

[0079] By fixing the separation ring 5 in the storage chamber 22, the foaming agent particles are isolated from the special-shaped rod 4. On the one hand, the probability of the foaming agent particles blocking the limiting groove 41 can be effectively reduced, thereby ensuring the smoothness of the movement of the sliding column 43 in the limiting groove 41. On the other hand, during the movement of the assembly plate 42 and the conveying needle 25, only the conveying needle 25 is interspersed in the foaming agent particles, thereby effectively reducing the resistance of the foaming agent particles to the movement of the assembly plate 42.

[0080] As a preferred embodiment of the present invention, the delivery needle 25 is composed of a needle tube 27 and an elastic sheet 28. The needle tube 27 is a hollow tubular structure with uniform holes on the surface. The elastic sheet 28 is fixedly installed on the inner wall of the needle tube 27. The elastic sheet 28 is made of high temperature resistant elastic material.

[0081] The delivery needle 25 is composed of a needle tube 27 and an elastic sheet 28. In actual application, when the delivery needle 25 is retracted into the storage chamber 22, the foaming agent particles enter the microgrooves 26 on the surface of the delivery needle 25 under the action of gravity. Since the microgrooves 26 are composed of holes on the surface of the needle tube 27 and the elastic sheet 28, when the delivery needle 25 moves into the extruder barrel 1, the delivery needle 25 is scraped by the scraper ring 3. During the scraping process, when the foaming agent particles in the microgrooves 26 are subjected to the scraping force, the microgrooves 26 can be pushed to deform slightly to enhance the retention effect of the foaming agent particles.

[0082] As a preferred embodiment of the present invention, a pressure regulating tube 6 is fixedly installed on the assembly plate 42, and the pressure regulating tube 6 is conductively connected to the inner cavity of the corresponding needle tube 27. A compressor 61, a condenser 62 and an expansion valve 63 are installed on the connecting shell 2. The compressor 61, the expansion valve 63, the pressure regulating tube 6, the needle tube 27 and the condenser 62 constitute a refrigeration system for cooling the needle tube 27.

[0083] As a preferred embodiment of the present invention, the elastic sheet 28 is initially protruded toward the outside of the needle tube 27 .

[0084] The needle tube 27 is used as an evaporator. During the entire operation process, the compressor 61 extracts the evaporated refrigerant in the needle tube 27 through the pipeline, compresses the refrigerant, and transports the compressed refrigerant to the needle tube 27 through the condenser 62, the expansion valve 63, and the pressure regulating tube 6, and volatilizes in the needle tube 27, causing the needle tube 27 to absorb heat and cool. When the delivery needle 25 is located in the extruder barrel 1, the delivery needle 25 continues to cool, which can gradually solidify the molten raw material in contact with the delivery needle 25, thereby reducing the difficulty of separating the delivery needle 25 from the raw material, and because the delivery needle 25 is in the molten raw material When the delivery needle 25 is in the storage chamber 22, the heat transfer outside the delivery needle 25 slows down, so the temperature of the delivery needle 25 continues to decrease. Under the action of thermal expansion and contraction, the elastic sheet 28 shrinks, and the elastic sheet 28 protruding outward in the initial state gradually flattens, thereby increasing the volume of the microgroove 26 for accommodating the foaming agent particles.

[0085] like Fig.11 As shown, a foaming product processing technology comprises the following steps:

[0086] S1: The HDPE raw material is conveyed into the over-homogenization bin by negative pressure suction and homogenized in the over-homogenization bin;

[0087] S2: The homogenized HDPE, filler masterbatch, color masterbatch and weathering masterbatch are loaded in proportion and then introduced into the mixer. After the mixing is completed, the mixture is transported to the transition silo and continuously fed into the extruder barrel 1 under the action of negative pressure transportation.

[0088] S3: The raw materials are transported, heated and stirred in the extruder barrel 1 under the conveyance of the extrusion screw. When the molten raw materials are conveyed to the melt conveying section 13, the dispersing and adding components cooperate with the forced telescopic components to evenly disperse the foaming agent in the raw materials;

[0089] S4: After the raw materials and the foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw, and then extruded through the extruder head at the end of the extruder barrel 1, and after being shaped and cooled in the mold, they are pulled, cut, processed and assembled to form a finished product.

[0090] A foamed product, comprising a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer form a three-layer overlapping structure;

[0091] The core layer is composed of the following materials:

[0092] HDPE 84.3%;

[0093] Filler masterbatch 10%;

[0094] Masterbatch 3%;

[0095] Foaming agent regulator 0.15%;

[0096] Foaming agent 0.25%;

[0097] Polymer dispersant 0.3%;

[0098] Weathering masterbatch 2%;

[0099] The core layer is made of the following materials:

[0100] HDPE, wear-resistant resin and scratch-resistant resin together account for 96.7%;

[0101] Masterbatch 3%;

[0102] Wood grain masterbatch 0.3%.

[0103] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A foam product processing device, comprising an extruder barrel (1), wherein an extrusion screw is rotatably mounted in the extruder barrel (1), and the interior of the extruder barrel (1) is sequentially divided into a solid conveying section (11), a melting section (12) and a melt conveying section (13); Features: It also includes a dispersing and adding component, which is installed on the extruder barrel (1) and is used to disperse and add the foaming agent into the polyolefin; The dispersing and adding component comprises a communicating shell (2), a driving roller (21) and a conveying needle (25); A connecting shell (2) is fixedly mounted on the extruder barrel (1), the connecting shell (2) is aligned with the melt conveying section (13), and the connecting shell (2) is conductively connected to the inner cavity of the extruder barrel (1); A driving roller (21) is rotatably mounted in the communicating shell (2), the driving roller (21) is externally connected to a driving motor, a storage chamber (22) is provided in the driving roller (21), and a material pipe (23) is mounted on the communicating shell (2) for conveying foaming agent particles into the storage chamber (22); The driving roller (21) is provided with evenly distributed mounting holes (24), the transport needle (25) is installed on the driving roller (21) through the mounting holes (24), and the transport needle (25) is provided with evenly distributed micro grooves (26); It also comprises a forced telescopic component, which is mounted on the communicating shell (2) and is used to drive the delivery needle (25) to reciprocate inside and outside the storage chamber (22).

2. A foam product processing device according to claim 1, characterized in that: A scraper ring (3) is fixedly installed at the connection point between the mounting hole (24) and the storage cavity (22), and a baffle (31) is fixedly installed at the connection point between the connecting shell (2) and the inner cavity of the extruder barrel (1).

3. A foam product processing device according to claim 2, characterized in that: The dispersing and adding components are provided in multiple groups, and the multiple groups of dispersing and adding components are evenly arranged along the spiral direction of the extrusion screw.

4. A foam product processing device according to claim 3, characterized in that: The forced telescopic assembly comprises a special-shaped rod (4), an assembly plate (42) and a sliding column (43); The shaped rod (4) is fixedly mounted on the connecting shell (2), the shaped rod (4) extends into the storage cavity (22), and a limiting groove (41) is provided at one end of the shaped rod (4) located in the storage cavity (22); The delivery needles (25) are divided into a plurality of groups, and the delivery needles (25) in the same group are fixedly connected via an assembly plate (42); A sliding column (43) is fixedly mounted on one end of the assembly plate (42) facing the special-shaped rod (4), and the sliding column (43) extends into the limiting groove (41).

5. A foam product processing device according to claim 4, characterized in that: A separation ring (5) is fixedly installed in the storage chamber (22); the separation ring (5) and the driving roller (21) are coaxially designed; the foaming agent particles are located between the separation ring (5) and the inner wall of the storage chamber (22); and the delivery needle (25) passes through the separation ring (5).

6. A foam product processing device according to claim 5, characterized in that: The delivery needle (25) is composed of a needle tube (27) and an elastic sheet (28); the needle tube (27) is a hollow tubular structure with holes evenly opened on the surface; the elastic sheet (28) is fixedly mounted on the inner wall of the needle tube (27); and the elastic sheet (28) is made of a high-temperature resistant elastic material.

7. A foam product processing device according to claim 6, characterized in that: A pressure regulating tube (6) is fixedly mounted on the assembly plate (42), and the pressure regulating tube (6) is conductively connected to the inner cavity of the corresponding needle tube (27). A compressor (61), a condenser (62) and an expansion valve (63) are mounted on the connecting shell (2). The compressor (61), the expansion valve (63), the pressure regulating tube (6), the needle tube (27) and the condenser (62) constitute a refrigeration system for cooling the needle tube (27).

8. A foam product processing device according to claim 7, characterized in that: The elastic sheet (28) protrudes toward the outside of the needle tube (27) in an initial state.

9. A foam product processing technology, characterized in that: The foam product processing process uses the foam product processing device according to claim 8, and the process includes the following steps: S1: The polyolefin raw material is conveyed into the excessive homogenization bin by negative pressure suction and heated in the excessive homogenization bin; S2: HDPE, filler masterbatch, color masterbatch and weathering masterbatch are introduced into a mixer according to a certain proportion and then conveyed to a transition silo after the mixing is completed. Under the action of negative pressure conveying, the mixture is continuously conveyed into the extruder barrel (1); S3: The raw materials are transported, heated and stirred in the extruder barrel (1) under the conveyance of the extrusion screw. When the molten raw materials are conveyed to the melt conveying section (13), the dispersing and adding component cooperates with the forced expansion and contraction component to evenly disperse the foaming agent in the raw materials; S4: After the raw materials and the foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw, and then extruded through the extruder head at the end of the extruder barrel (1), shaped and cooled in the mold, and then pulled, cut, processed and assembled to form a finished product.

10. A foaming product, characterized in that: The foamed product is prepared by the foamed product processing technology described in claim 9; the foamed product comprises a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer constitute a three-layer overlapping structure; The core layer is composed of the following materials: HDPE 84.3%; Filler masterbatch 10%; Masterbatch 3%; Foaming agent regulator 0.15%; Foaming agent 0.25%; Polymer dispersant 0.3%; Weathering masterbatch 2%; The core layer is made of the following materials: HDPE, wear-resistant resin and scratch-resistant resin together account for 96.7%; Masterbatch 3%; Wood grain masterbatch 0.3%.

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