A2 non-combustible grade composite board core material extruder

Abstract

The invention discloses an A2 non-combustible grade composite board core material extruder which comprises a rack, an extrusion barrel is arranged on the rack, an extrusion screw is installed in the extrusion barrel, a feeding hopper is arranged at one end of the extrusion barrel, an extrusion die is fixed to the other end of the extrusion barrel, an extraction opening is formed in the extrusion barrel, a heating device is fixed to the outer portion of the extrusion barrel, and the extrusion screw comprises a rod body and a screw edge. The screw comprises a feeding section, a conveying section, a pre-plasticizing section, a plasticizing section, a compression section, an exhaust section and a metering section, the lead angles of screw flights of the feeding section, the conveying section, the pre-plasticizing section and the plasticizing section are gradually reduced, the lead angle of the screw flights of the compression section is smaller than the lead angles of the plasticizing section and the exhaust section, and the lead angle of the screw flights of the exhaust section is larger than the lead angle of the metering section; the lead of the screw flight of the feeding section, the lead of the screw flight of the conveying section, the lead of the screw flight of the pre-plasticizing section and the lead of the screw flight of the plasticizing section are gradually reduced, the lead of the screw flight of the compression section is smaller than the lead of the screw flight of the plasticizing section and the lead of the screw flight of the exhaust section, and the lead of the screw flight of the metering section is larger than the lead of the screw flight of the exhaust section.

Description

Technical Field

[0001] This invention relates to a composite board core material extruder, and more particularly to an A2 non-combustible composite board core material extruder. Background Technology

[0002] Class A fireproof insulation materials are the building insulation materials with the highest fire resistance rating. Based on their combustion performance, they are divided into two categories: Class A1 (single inorganic non-combustible) and Class A2 (composite organic non-combustible). Metal composite panels generally consist of an upper metal layer, a lower metal layer, and a core layer in the middle. The core layer is usually made of PE plastic. To improve the fire resistance of the metal composite panel, the core layer is made of a material with an A2 fire resistance rating, thus giving the metal composite panel an A2 fire resistance rating. The core material with an A2 fire resistance rating generally consists of plastic particles with inorganic materials added. For example, the invention application document 202510287937.X discloses a plastic fire-retardant material for extrusion. This material mainly includes: 3-10% polyethylene plastic particles, 30-50% magnesium hydroxide, 40-50% aluminum hydroxide, and 2-8% mixed additives. Because this composite organic material contains a large amount of inorganic materials, its flowability is worse than that of conventional plastic core layers, making extrusion more difficult. At the same time, due to the low content of plastic particles, it requires thorough mixing and plasticization. Furthermore, because the core layer panel is relatively wide (standard width 1220mm), the conventional extrusion screws used for extruding plastics are unable to completely fill the mold with materials of poor flowability. However, conventional extruders are currently unable to meet the extrusion requirements of the aforementioned materials. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an A2 non-combustible composite board core material extruder that can meet the extrusion requirements of A2 non-combustible materials.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: an A2 non-combustible composite board core material extruder, comprising a frame, an extrusion cylinder mounted on the frame, an extrusion screw driven by an extrusion power device rotatably mounted inside the extrusion cylinder, a feed hopper at one end of the extrusion cylinder, and an extrusion die fixed at the other end, an air extraction port on the side of the extrusion cylinder near the extrusion die, a first heating device fixed to the outside of the extrusion cylinder, the extrusion screw comprising a rod body and a spiral helix integrally formed into a conical shape on the rod body, the extrusion screw comprising a feeding section, a conveying section, and a feeding section. The feed section, conveying section, pre-plasticizing section, plasticizing section, compression section, venting section, and metering section are configured such that the lead angle of the screw threads in the feed section, conveying section, pre-plasticizing section, and plasticizing section gradually decreases; the lead angle of the screw threads in the compression section is smaller than the lead angle of the screw threads in the plasticizing section and venting section; and the lead angle of the screw threads in the venting section is larger than the lead angle of the screw threads in the metering section.

[0005] As a preferred embodiment, the extrusion die includes a flat, elongated die body fixed to an extrusion cylinder. One end of the die body has a feed inlet for communication with the extrusion cylinder, and the other end has a flat, elongated forming outlet. The die body has a cavity connecting the feed inlet and the forming outlet. The cavity includes a main channel, a diffusion channel, and a flow-blocking and pressurizing channel. One end of the main channel is connected to the feed inlet, and the feed side of the diffusion channel is connected to the other end of the main channel. The diffusion channel extends from the main channel to the left and right sides and is adapted to the width of the core material. One end of the flow-blocking and pressurizing channel is connected to the diffusion channel, and the other end is connected to the flat, elongated forming outlet. The die body has a blocking structure extending into the flow-blocking and pressurizing channel, and a second heating device is also provided on the die body.

[0006] As a preferred embodiment, the cross-sectional area of ​​the main channel gradually decreases from the feed inlet to the forming outlet. The cross-section of the diffusion channel includes an upstream inclined, gently converging section and a downstream sharply converging section, which is connected to the flow-blocking and pressurizing channel.

[0007] As a preferred embodiment, the diffusion channel includes a left diffusion segment and a right diffusion segment, the left diffusion segment extending obliquely to the left and the right diffusion segment extending obliquely to the right, the left diffusion segment and the right diffusion segment having the same oblique angle and an oblique angle of 4-7°.

[0008] As a preferred embodiment, the mold body is provided with a fixed die, and a movable die is slidably mounted on the mold body along the thickness direction. The movable die and the fixed die form the forming outlet. The mold body is provided with a die adjusting structure for adjusting the position of the movable die. The die adjusting structure includes a die adjusting screw rotatably mounted on the mold body, and the die adjusting screw is threadedly connected to the movable die.

[0009] As a preferred embodiment, the blocking structure includes a blocking plate movably mounted on the mold body, the mold body being provided with a blocking adjusting screw connected to the blocking plate, the blocking plate being slidably mounted on the side near the fixed die, and the blocking plate being inclined with its front end near the molding exit.

[0010] As a preferred embodiment, the compression section includes a first compression section and a second compression section, wherein the lead angle of the first compression section is smaller than the lead angle of the second compression section, the lead of the first compression section is smaller than the lead of the second compression section, the lead angle of the first compression section is 1-3°, and the lead angle of the second compression section is 9-11°.

[0011] As a preferred embodiment, the screw thread thickness of the metering section is greater than that of the exhaust section, and the screw thread thickness of the metering section is 3-5 times that of the exhaust section.

[0012] As a preferred embodiment, the bottom of the frame is provided with support rollers and guide rails, the support rollers are in rolling cooperation with the guide rollers, and the frame is driven by a frame adjustment device.

[0013] As a preferred embodiment, the frame adjustment device includes an adjustment base fixed on the ground, an adjustment motor fixed on the adjustment base, and the adjustment motor connected to the frame via a lead screw and nut mechanism.

[0014] After adopting the above technical solution, the effect of the present invention is as follows: An A2 non-combustible composite board core material extruder includes a frame, on which an extrusion cylinder is mounted. An extrusion screw driven by an extrusion power device is rotatably installed inside the extrusion cylinder. A feed hopper is provided at one end of the extrusion cylinder, and an extrusion die is fixed at the other end. An air extraction port is provided on the side of the extrusion cylinder near the extrusion die. A first heating device is fixed to the outside of the extrusion cylinder. The extrusion screw includes a rod body and a spiral helix integrally formed into a conical shape on the rod body. The extrusion screw includes a feeding section, a conveying section, a pre-plasticizing section, a plasticizing section, a compression section, a venting section, and a metering section. The lead angle of the spiral helix in the feeding section, conveying section, pre-plasticizing section, and plasticizing section gradually decreases. The lead angle of the spiral helix in the compression section is smaller than that in the plasticizing section and the venting section, and the lead angle of the spiral helix in the venting section is greater than that in the extrusion section. The lead angle of the screw thread in the metering section; the lead angles of the screw threads in the feeding section, conveying section, pre-plasticizing section, and plasticizing section gradually decrease. The lead angle of the screw thread in the compression section is smaller than that in the plasticizing and venting sections, while the lead angle of the screw thread in the metering section is larger than that in the venting section. Therefore, during use, the material enters from the feed hopper, the extrusion screw is driven to rotate, and a first heating device is installed on the outside of the extrusion barrel to heat the material and plasticize it. After the material passes through the feeding section, conveying section, pre-plasticizing section, and plasticizing section in sequence, the feeding, conveying, and plasticizing of the material are completed. Among them, because the lead angle gradually decreases, the material conveying speed in the feeding section is the highest, which can effectively avoid the blockage of the feed inlet. When entering the pre-plasticizing and plasticizing sections, the conveying speed decreases and the extrusion pressure increases because the lead angle is even smaller. At this time, there is sufficient plasticizing time to ensure the effect of plasticizing and mixing. Upon entering the compression section, the lead of the screw threads in this section is smaller than that in the plasticizing and venting sections. Therefore, the material conveying speed is minimal while the extrusion pressure is maximized in this compression section, facilitating extrusion in the venting and metering sections. The lead of the screw threads in the metering section is greater than that in the venting section, providing more space between the screw threads to fill the material. This allows for better venting of the material, ensuring that as much gas as possible is expelled and preventing air bubbles from forming in the formed core layer. Simultaneously, the increased conveying speed of the material in the venting section after the compression section allows for downstream transport, ensuring a more compact filling of the downstream extrusion die cavity. Therefore, this extruder screw is suitable for extruding A2 non-combustible composite board core materials.

[0015] Furthermore, the extrusion die includes a flat, elongated die body fixed to the extrusion cylinder. One end of the die body has a feed inlet for communicating with the extrusion cylinder, and the other end has a flat, elongated forming outlet. The die body has a cavity connecting the feed inlet and the forming outlet. The cavity includes a main channel, a diffusion channel, and a flow-blocking and pressurizing channel. One end of the main channel is connected to the feed inlet, and the feed side of the diffusion channel is connected to the other end of the main channel. The diffusion channel extends from the main channel to the left and right sides and is adapted to the width of the core material. One end of the flow-blocking and pressurizing channel is connected to the diffusion channel, and the other end is connected to the flat, elongated forming outlet. The die body has a cavity extending into the flow-blocking and pressurizing channel. The die body is equipped with a second heating device and a blocking structure within the flow boosting channel. During use, the feed inlet is connected to the outlet of the extruder. The extruder forces the material into the die cavity via the extrusion screw. After passing through the main channel, the material is diverted to the left and right sides via the diffusion channel, and then further boosted by the flow boosting channel. This allows the material to be extruded from the molding outlet to form a core layer with the required thickness and width. The blocking structure of this extrusion die achieves flow boosting and increases the extrusion pressure, thus meeting the extrusion requirements for A2 non-flammable materials with low plastic particle content. The second heating device can be a heating rod used to continuously heat the die, ensuring the material is at a suitable temperature and preventing blockage due to excessively low temperatures.

[0016] Furthermore, since the cross-sectional area of ​​the main channel gradually decreases from the feed inlet to the forming outlet, the cross-section of the diffusion channel includes an upstream inclined, gently converging section and a downstream sharply converging section, which connects to the flow-blocking and pressurizing channel. The diffusion channel includes a left diffusion section and a right diffusion section. The left diffusion section extends to the left at an incline, and the right diffusion section extends to the right at an incline. The inclination angles of the left and right diffusion sections are the same and range from 4 to 7 degrees. The gently converging section facilitates material entry, while the sharply converging section further increases the extrusion pressure and the material's density. Simultaneously, the rapidly converging section allows denser material to gradually enter the flow-blocking and pressurizing channel, ensuring a better blocking and pressurizing effect from the blocking structure. The inclined left and right diffusion sections facilitate a uniform diffusion distribution of material from left to right. Furthermore, due to the poor flowability of the material, setting the inclination angle to 4-7 degrees ensures sufficient time for diffusion to both sides in the forward flow direction, thereby ensuring that the material on both sides is filled and guaranteeing uniform discharge from the forming outlet.

[0017] Furthermore, the mold body is equipped with a fixed die and a movable die slidably mounted on the mold body along the thickness direction. The movable die and the fixed die form the forming outlet. The mold body is provided with a die adjustment structure for adjusting the position of the movable die. The die adjustment structure includes a die adjustment screw rotatably mounted on the mold body, and the die adjustment screw is threadedly connected to the movable die. The position of the movable die can be adjusted through the die adjustment structure, thereby adjusting the thickness of the forming outlet to meet the extrusion requirements of core materials of different thicknesses.

[0018] Furthermore, the blocking structure includes a blocking plate movably mounted on the mold body. The mold body is equipped with a blocking adjustment screw connected to the blocking plate. The blocking plate is slidably mounted on the side near the fixed die opening, and is inclined with its front end close to the molding outlet. The length of the blocking plate extending into the flow-blocking and pressurizing channel can be adjusted by rotating the blocking adjustment screw, thereby regulating the flow-blocking and pressurizing effect.

[0019] Furthermore, since the compression section includes a first compression section and a second compression section, the lead angle of the first compression section is smaller than that of the second compression section, and the lead of the first compression section is smaller than that of the second compression section. The lead angle of the first compression section is 1-3°, and the lead angle of the second compression section is 9-11°. Therefore, the different lead angles of the first and second compression sections increase the axial force, which is beneficial to material compression and shear heat generation.

[0020] Furthermore, since the bottom of the frame is equipped with support rollers and guide rails, and the support rollers roll in cooperation with the guide rollers, and the frame is driven by a frame adjustment device, the position of the frame can be adjusted as a whole through the frame lifting device, facilitating the adjustment of the overall extruder position in the composite board production line. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a front structural diagram of an embodiment of the present invention;

[0023] Figure 2 This is a top view of the structure according to an embodiment of the present invention;

[0024] Figure 3 This is a front structural diagram of the extrusion die according to an embodiment of the present invention;

[0025] Figure 4 This is a side view of the extrusion die according to an embodiment of the present invention;

[0026] Figure 5 This is a bottom view of the extrusion die according to an embodiment of the present invention;

[0027] Figure 6 This is a partial structural diagram of the extrusion screw according to an embodiment of the present invention;

[0028] Figure 7 This is a partial structural diagram of the remaining part of the extrusion screw in an embodiment of the present invention;

[0029] In the attached diagram: 1. Frame; 2. Extrusion barrel; 3. Extrusion screw; 31. Screw body; 32. Screw ribs; a1. Feed section; a2. Conveying section; a3. Pre-plasticizing section; a4. Plasticizing section; a5. First compression section; a6. Second compression section; a7. Exhaust section; a8. Metering section; b1. Feed lead; b2. Conveying lead; b3. Pre-plasticizing lead; b4. Plasticizing lead; b5. First compression lead; b6. Second compression lead; b7. Exhaust lead; b8. Metering lead; c1. Feed section lead angle; c2. Conveying section lead angle; c3. Pre-plasticizing section lead angle; c4. Plasticizing section lead angle; c5. First compression section lead angle; c6. Second compression section lead angle; c7. 4. Exhaust section lead angle; 5. Metering section lead angle; 6. Extrusion power unit; 7. Feed hopper; 8. Extrusion die; 9. Die body; 10. Feed inlet; 11. Forming outlet; 12. Main channel; 13. Diffusion channel; 14. Slow-closing section; 15. Rapid-closing section; 16. Left diffusion section; 17. Right diffusion section; 18. Flow-blocking and pressurizing channel; 19. Baffle plate; 20. Second heating device; 10. Fixed die; 11. Movable die; 12. Die adjusting screw; 13. Baffle adjusting screw; 14. Buffer channel; 15. Air extraction port; 16. First heating device; 17. Support roller; 18. Guide rail; 19. Adjusting base; 10. Adjusting motor. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments.

[0031] The lead angle in this embodiment is a well-known technique in the art, also known as the thread helix angle, which is the angle between the tangent of the helix and the plane perpendicular to the thread axis on the cylindrical part of the screw.

[0032] like Figure 1-7As shown, an A2 non-combustible composite board core material extruder includes a frame 1, an extrusion cylinder 2 mounted on the frame 1, an extrusion screw 3 driven by an extrusion power device 4 rotatably mounted inside the extrusion cylinder 2, a feed hopper 5 at one end of the extrusion cylinder 2, and an extrusion die 6 fixed at the other end. An air extraction port 7 is provided on the side of the extrusion cylinder 2 near the extrusion die 6. A first heating device 8 is fixed to the outside of the extrusion cylinder 2. The extrusion screw 3 includes a rod body and a spiral helix integrally formed into a conical shape on the rod body. The extrusion screw 3 includes a feeding section a1, a conveying section a2, a pre-plasticizing section a3, a plasticizing section a4, and a compression section. The lead angles of the screw threads in the exhaust section a7 and metering section a8, the feeding section a1, the conveying section a2, the pre-plasticizing section a3, and the plasticizing section a4 gradually decrease. The lead angle of the screw thread in the compression section is smaller than that in the plasticizing section a4 and the exhaust section a7, while the lead angle of the screw thread in the exhaust section a7 is larger than that in the metering section a8.

[0033] In this embodiment, the lead of the screw thread in the feeding section a1 is referred to as the feeding lead b1, and so on, i.e., feeding lead b1 > conveying lead b2 > pre-plasticizing lead b3 > plasticizing lead b4 > compression lead, metering lead b8 > venting lead b7 > compression lead; the lead angle of the screw thread in the feeding section a1 is referred to as the feeding section lead angle c1, and so on, i.e., feeding section lead angle c1 > conveying section lead angle c2 > pre-plasticizing section lead angle c3 > plasticizing section lead angle c4 > compression section lead angle, venting section lead angle c7 > compression section lead angle, venting section lead angle c7 > metering section lead angle c8. The extrusion power unit 4 can be a motor.

[0034] The compression section includes a first compression section a5 and a second compression section a6. The lead angle of the first compression section a5 is smaller than the lead angle of the second compression section a6, referred to as the first compression section lead angle c5 and the second compression section lead angle c6. The lead of the first compression section a5 is smaller than the lead of the second compression section a6, referred to as the first compression lead b5 and the second compression lead b6. In this embodiment, the lead angle c5 of the first compression section is 1-3°, and the lead angle c6 of the second compression section is 9-11°.

[0035] In this embodiment, the screw thread thickness of metering section a8 is greater than that of exhaust section a7, and the screw thread thickness of metering section a8 is 3-5 times that of exhaust section a7. The extrusion die 6 includes a flat, elongated die body 61 fixed to the extrusion cylinder 2. One end of the die body 61 is provided with a feed inlet 62 for communicating with the extrusion cylinder 2, and the other end is provided with a flat, elongated forming outlet 63. The die body 61 is provided with a die cavity connecting the feed inlet 62 and the forming outlet 63. The die cavity includes a main channel 64, a diffusion channel 65, and a flow-blocking and pressurizing channel 66. One end of the main channel 64 is connected to the feed inlet 62, and the feed side of the diffusion channel 65 is connected to the other end of the main channel 64. The diffusion channel 65 disperses to the left and right sides from the position of the main channel 64 and is adapted to the width of the core material. One end of the flow-blocking and pressurizing channel 66 is connected to the diffusion channel 65, and the other end is connected to the flat, elongated forming outlet 63. The die body 61 is provided with a blocking structure extending into the flow-blocking and pressurizing channel 66. The die body 61 is also provided with a second heating device 68.

[0036] A fixed die 69 is provided on the mold body 61, which is defined as the thickness direction perpendicular to the material flow direction. A movable die 610 is slidably installed on the mold body 61 along the thickness direction. The movable die 610 and the fixed die 69 form the forming outlet 63. A die adjusting structure is provided on the mold body 61 to adjust the position of the movable die 610. The die adjusting structure includes a die adjusting screw 611 rotatably installed on the mold body 61. The die adjusting screw 611 is threadedly connected to the movable die 610.

[0037] In this embodiment, the blocking structure includes a blocking plate 67 movably mounted on the mold body 61. The mold body 61 is provided with a blocking adjusting screw 612 connected to the blocking plate 67. The blocking plate 67 is slidably mounted on the side close to the fixed die 69. The blocking plate 67 is inclined and its front end is closer to the molding outlet 63.

[0038] The cross-sectional area of ​​the main channel 64 gradually decreases from the feed inlet 62 to the forming outlet 63. The cross-section of the diffusion channel 65 includes an upstream inclined, gently converging section 651 and a downstream sharply converging section 652, which connects to the flow-blocking and pressurizing channel 66. The diffusion channel 65 includes a left diffusion section 653 and a right diffusion section 654. The left diffusion section 653 extends inclined to the left, and the right diffusion section 654 extends inclined to the right. The inclination angles of the left diffusion section 653 and the right diffusion section 654 are the same and are inclined between 4-7°. In this embodiment, a buffer channel 613 is also provided downstream of the flow-blocking and pressurizing channel 66. The thickness of the cross-section of the buffer channel 613 is greater than the thickness of the forming outlet 63.

[0039] The bottom of the frame 1 is provided with support rollers 9 and guide rails 10. The support rollers 9 are in rolling cooperation with the guide rollers. The frame 1 is driven by an adjustment device. The adjustment device includes an adjustment base 11 fixed on the ground. An adjustment motor 12 is fixed on the adjustment base 11. The adjustment motor 12 is connected to the frame 1 through a screw and nut mechanism.

[0040] During operation, the material enters from the feed hopper 5, and the extrusion power unit 4 drives the extrusion screw 3. The first heating device 8 is installed on the outside of the extrusion cylinder 2 to heat the material. The first heating device 8 can be electric heating or oil heating to plasticize the material. The material passes through the feeding section a1, the conveying section a2, the pre-plasticizing section a3 and the plasticizing section a4 in sequence to complete the feeding, conveying and plasticizing of the material. Among them, due to the gradual reduction of the lead angle, the material conveying speed in the feeding section a1 is the largest, which can effectively avoid the blockage of the feed port 62. When entering the pre-plasticizing section a3 and the plasticizing section a4, the conveying speed decreases and the extrusion pressure increases due to the smaller lead angle. At this time, there is sufficient plasticizing time to ensure the effect of plasticizing and mixing.

[0041] When entering the compression section, the lead of the screw thread in the compression section is smaller than that in the plasticizing section a4 and the venting section a7. Therefore, the material conveying speed is the lowest and the extrusion pressure is the highest in the compression section, which facilitates the extrusion in the venting section a7 and the metering section a8. The metering lead b8 is greater than the venting lead b7, so there is more space between the screw threads to fill the material, allowing the gas in the material to be discharged as much as possible.

[0042] After passing through the compression section, the material is conveyed at a higher speed in the exhaust section a7, allowing it to be transported downstream as much as possible. This ensures that the material can more compactly fill the cavity of the downstream extrusion die 6. The material first passes through the main channel 64, and then flows to the left and right sides through the diffusion channel 65. The inclined left diffusion section 653 and right diffusion section 654 facilitate the uniform diffusion and distribution of the material. The gently converging section 651 facilitates the entry of the material, while the sharply converging section 652 further increases the extrusion pressure and the compactness of the material. It then passes through the flow-blocking and pressurizing channel 66 for flow-blocking and pressurizing. Downstream of the flow-blocking and pressurizing channel 66, a buffer channel is also provided. This buffer channel has sufficient storage space to ensure that enough material is continuously extruded from the forming outlet 63, so that the core layer with the required thickness and width is formed at the forming outlet 63. The extrusion die 6 also achieves flow-blocking and pressurizing through a blocking structure. Rotating the blocking adjustment screw 612 can adjust the length of the blocking plate 67 extending into the flow-blocking and pressurizing channel 66, thereby increasing the extrusion pressure. The second heating device 68 uses a heating rod to ensure that the material is at a suitable temperature.

[0043] In addition, in this embodiment, the position of the movable die 610 can be adjusted by adjusting the die adjusting screw 611, thereby adjusting the thickness of the forming outlet 63. The position of the frame 1 can be adjusted by the frame adjusting device, which makes it convenient to adjust the position of the overall extruder in the composite board production line.

[0044] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and alterations made to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An A2 non-combustible composite board core material extruder, comprising a frame, an extrusion cylinder mounted on the frame, an extrusion screw driven by an extrusion power device rotatably mounted inside the extrusion cylinder, a feed hopper at one end of the extrusion cylinder, and an extrusion die fixed at the other end, an air extraction port on the side of the extrusion cylinder near the extrusion die, and a first heating device fixed to the outside of the extrusion cylinder, characterized in that: The extrusion screw includes a rod body and a conical spiral rib integrally formed on the rod body. The extrusion screw includes a feeding section, a conveying section, a pre-plasticizing section, a plasticizing section, a compression section, a venting section, and a metering section. The lead angle of the spiral ribs in the feeding section, conveying section, pre-plasticizing section, and plasticizing section gradually decreases. The lead angle of the spiral ribs in the compression section is smaller than the lead angle of the spiral ribs in the plasticizing section and the venting section, while the lead angle of the spiral ribs in the venting section is larger than the lead angle of the spiral ribs in the metering section. The lead of the spiral ribs in the feeding section, conveying section, pre-plasticizing section, and plasticizing section gradually decreases. The lead of the spiral ribs in the compression section is smaller than the lead of the spiral ribs in the plasticizing section and the venting section, while the lead of the spiral ribs in the metering section is larger than the lead of the spiral ribs in the venting section.

2. The A2 non-combustible composite board core material extruder as described in claim 1, characterized in that: The extrusion die includes a flat, elongated die body fixed to an extrusion cylinder. One end of the die body has a feed inlet for communication with the extrusion cylinder, and the other end has a flat, elongated forming outlet. The die body has a cavity connecting the feed inlet and the forming outlet. The cavity includes a main channel, a diffusion channel, and a flow-blocking and pressurizing channel. One end of the main channel is connected to the feed inlet, and the feed side of the diffusion channel is connected to the other end of the main channel. The diffusion channel extends from the main channel to the left and right sides and is adapted to the width of the core material. One end of the flow-blocking and pressurizing channel is connected to the diffusion channel, and the other end is connected to the flat, elongated forming outlet. The die body has a blocking structure extending into the flow-blocking and pressurizing channel, and a second heating device is also provided on the die body.

3. The A2 non-combustible composite board core material extruder as described in claim 2, characterized in that: The cross-sectional area of ​​the main channel gradually decreases from the feed inlet to the forming outlet. The cross-section of the diffusion channel includes an upstream inclined gently converging section and a downstream sharply converging section. The sharply converging section is connected to the flow-blocking and pressurizing channel.

4. The A2 non-combustible composite board core material extruder as described in claim 3, characterized in that: The diffusion channel includes a left diffusion segment and a right diffusion segment. The left diffusion segment extends to the left at an angle, and the right diffusion segment extends to the right at an angle. The left and right diffusion segments have the same angle and are inclined between 4 and 7°.

5. An A2 non-combustible composite board core material extruder as described in claim 4, characterized in that: The mold body is provided with a fixed die, and a movable die is slidably installed on the mold body along the thickness direction. The movable die and the fixed die form the forming outlet. The mold body is provided with a die adjusting structure for adjusting the position of the movable die. The die adjusting structure includes a die adjusting screw rotatably installed on the mold body, and the die adjusting screw is threadedly connected to the movable die.

6. The A2 non-combustible composite board core material extruder as described in claim 5, characterized in that: The blocking structure includes a blocking plate movably mounted on the mold body. The mold body is provided with a blocking adjusting screw connected to the blocking plate. The blocking plate is slidably mounted on the side close to the fixed die opening. The blocking plate is inclined and its front end is close to the molding exit.

7. The A2 non-combustible composite board core material extruder as described in claim 1, characterized in that: The compression section includes a first compression section and a second compression section. The lead angle of the first compression section is smaller than the lead angle of the second compression section, and the lead of the first compression section is smaller than the lead of the second compression section. The lead angle of the first compression section is 1-3°, and the lead angle of the second compression section is 9-11°.

8. The A2 non-combustible composite board core material extruder as described in claim 7, characterized in that: The thickness of the screw thread in the metering section is greater than that in the exhaust section, and the thickness of the screw thread in the metering section is 3-5 times that in the exhaust section.

9. The A2 non-combustible composite board core material extruder as described in claim 1, characterized in that: The bottom of the frame is provided with support rollers and guide rails, the support rollers and the guide rollers are in rolling cooperation, and the frame is driven by a frame adjustment device.

10. An A2 non-combustible composite board core material extruder as described in claim 9, characterized in that: The frame adjustment device includes an adjustment base fixed on the ground, an adjustment motor fixed on the adjustment base, and the adjustment motor connected to the frame through a lead screw and nut mechanism.

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