Two-layer co-extrusion polystyrene composite board preparation device

Abstract

The utility model discloses a two-layer co-extrusion polystyrene composite board preparation device which comprises a main extruder, a first auxiliary extruder, a second auxiliary extruder and a third auxiliary extruder, the output end of the main extruder is connected with a material conveying mechanism, and the material conveying mechanism is connected with a shaping mold. The output end of the main extruder can extrude a molten main material to the material conveying mechanism, the output end of the first auxiliary extruder is connected with the output end of the main extruder, the output end of the first auxiliary extruder can extrude a reinforcing material, and the output end of the second auxiliary extruder can extrude a first surface layer material to the material conveying mechanism; and the output end of the third auxiliary extruder can extrude a second surface layer material to the material conveying mechanism. According to the device for preparing the two-layer co-extrusion polystyrene composite board, the first co-extrusion layer and the second co-extrusion layer are formed on the surface of the core material, so that the connecting strength of the first co-extrusion layer, the second co-extrusion layer and the core material can be improved, and the strength of the composite board can be improved through the reinforcing material.

Description

Technical Field

[0001] The utility model relates to the technical field of polystyrene plate production, in particular to a device for preparing a two-layer co-extruded polystyrene composite plate. Background Art

[0002] During the production process of polystyrene boards, the polystyrene masterbatch needs to be foamed first, and finally it is formed into polystyrene boards through a series of processes. In addition, boards with different properties are compounded on both sides of the polystyrene boards to form polystyrene composite boards, which generally include a bottom plate and a composite top plate, so that the polystyrene composite boards have certain composite properties. Polystyrene composite boards with composite properties are most widely used in building exterior wall materials.

[0003] In the composite molding process of existing polystyrene composite panels, adhesives are generally used to realize the composite formation between the polystyrene board, the bottom plate and the composite top plate. Due to the lack of other connecting structures, the composite panels may not be firmly bonded together, resulting in the separation of the panels. This not only affects the use of the composite panels, but also causes safety hazards on the exterior walls of buildings where polystyrene composite panels are used. Utility Model Content

[0004] The purpose of the utility model is to provide a device for preparing a two-layer co-extruded polystyrene composite board to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A two-layer co-extruded polystyrene composite board preparation device, comprising:

[0007] A main extruder, wherein the main extruder is provided with a main hopper for adding polystyrene raw materials and auxiliary raw materials, the output end of the main extruder is connected to a material conveying mechanism, the material conveying mechanism is connected to a shaping die, and the output end of the main extruder is capable of extruding the molten main material into the material conveying mechanism;

[0008] a first auxiliary extruder, wherein the first auxiliary extruder is provided with a first hopper for adding a reinforcing raw material, an output end of the first auxiliary extruder is capable of extruding the reinforcing material, and the output end of the first auxiliary extruder is connected to the output end of the main extruder;

[0009] a second auxiliary extruder, wherein the second auxiliary extruder is provided with a second hopper for adding the first surface raw material, the second auxiliary extruder is connected to the material conveying mechanism, and the output end of the second auxiliary extruder is capable of extruding the first surface layer material to the material conveying mechanism;

[0010] The third auxiliary extruder is provided with a third hopper for adding the second surface raw material. The third auxiliary extruder is connected to the material conveying mechanism. The output end of the third auxiliary extruder can extrude the second surface layer material to the material conveying mechanism.

[0011] The above-mentioned two-layer co-extruded polystyrene composite board preparation device is provided with a main control valve at the output end of the main extruder, and a first control valve is provided at the output end of the first auxiliary extruder. When the main control valve and the first control valve are in the open state, the main extruder and the first auxiliary extruder can co-extrude the core material mixture.

[0012] In the above-mentioned two-layer co-extruded polystyrene composite board preparation device, the output end of the second auxiliary extruder is provided with a second control valve, and the output end of the third auxiliary extruder is provided with a third control valve.

[0013] In the above-mentioned two-layer co-extruded polystyrene composite board preparation device, the shaping mold includes a mold body, an internal mold cavity and a reinforcement mold cavity are provided inside the mold body, and the reinforcement mold cavity is located inside the internal mold cavity.

[0014] In the above-mentioned two-layer co-extruded polystyrene composite board preparation device, a first annular cavity is provided on the mold body, and the first annular cavity is provided around the internal cavity.

[0015] In the above-mentioned two-layer co-extruded polystyrene composite board preparation device, the mold body is further provided with a second annular cavity, and the second annular cavity is arranged around the first annular cavity.

[0016] The above-mentioned two-layer co-extruded polystyrene composite board preparation device is provided with a core material flow channel, a reinforcing core flow channel, a first layer material flow channel and a second layer material flow channel on the mold body. The core material flow channel is connected to the internal cavity, the reinforcing core flow channel is connected to the reinforced cavity, the first annular cavity is connected to the first layer material flow channel, and the second layer material flow channel is connected to the second annular cavity.

[0017] The above-mentioned two-layer co-extruded polystyrene composite board preparation device has a first conveying channel and a second conveying channel arranged inside the material conveying mechanism, the first conveying channel is connected to the core material flow channel, the other end of the first conveying channel is connected to the output end of the main extruder, the second conveying channel is connected to the reinforced core flow channel, and the other end of the second conveying channel is connected to the output end of the first auxiliary extruder.

[0018] The above-mentioned two-layer co-extruded polystyrene composite board preparation device has a third conveying channel arranged inside the material conveying mechanism, one end of the third conveying channel is connected to the first layer material flow channel, and the other end of the third conveying channel is connected to the output end of the second auxiliary extruder.

[0019] The above-mentioned two-layer co-extruded polystyrene composite board preparation device further has a fourth conveying channel arranged inside the material conveying mechanism, one end of the fourth conveying channel is connected to the second layer material flow channel, and the other end of the fourth conveying channel is connected to the output end of the third auxiliary extruder.

[0020] In the above technical solution, the two-layer co-extruded polystyrene composite board preparation device provided by the utility model includes a main extruder, a first auxiliary extruder, a second auxiliary extruder and a third auxiliary extruder. The output end of the main extruder can extrude molten material, and the output end of the first auxiliary extruder can extrude reinforcing material. The main extruder and the first extruder work synchronously to realize co-extrusion. The first extruder extrudes the reinforcing material and mixes it with the main material (polystyrene foam material). In this way, the core material mixture of the main material and the reinforcing material can be transported to the shaping mold through the material conveying mechanism, and is processed into the core material through subsequent equipment. The third auxiliary extruder The output end of the second extruder can extrude a first surface layer material, thereby co-extruded a first co-extruded layer on the surface of the core material, and the first co-extruded layer is formed sequentially along the various surfaces of the core material. The output end of the third extruder can extrude a second surface layer material, thereby co-extruded a first co-extruded layer on the surface of the core material, and the first co-extruded layer is formed sequentially along the various surfaces of the core material. The output end of the third extruder can extrude a second surface layer material, and the second co-extruded layer is located on the surface of the first co-extruded layer. In this way, the connection strength of the first co-extruded layer, the second co-extruded layer and the core material can be improved, and the reinforcing material can increase the strength of the composite board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A front view of a device for preparing a two-layer co-extruded polystyrene composite board provided by another embodiment of the present invention;

[0023] Figure 2 A top view of a device for preparing a two-layer co-extruded polystyrene composite board provided in another embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of a shaping die provided in another embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the connection between the material conveying mechanism and the mold body provided in another embodiment of the present invention;

[0026] Figure 5 This is a structural schematic diagram of a composite board provided in another embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Main extruder; 11. Main hopper; 12. Main control valve; 2. First auxiliary extruder; 21. First hopper; 22. First control valve; 3. Second auxiliary extruder; 31. Second hopper; 32. Second control valve; 4. Third auxiliary extruder; 41. Third hopper; 42. Third control valve; 5. Molding mold; 51. Mold body; 52. Internal cavity; 53. Reinforced cavity; 54. First annular cavity; 55. Second annular cavity; 56. Core material flow channel; 57. Reinforced core flow channel; 58. First layer material flow channel; 59. Second layer material flow channel; 6. Material conveying mechanism; 61. First conveying channel; 62. Second conveying channel; 63. Third conveying channel; 64. Fourth conveying channel; 7. Composite sheet; 71. Core material; 72. Reinforcement rib; 73. First co-extrusion layer; 74. Second co-extrusion layer. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] like Figure 1-5 As shown, the utility model provides a two-layer co-extruded polystyrene composite board preparation device, including a main extruder 1, a first auxiliary extruder 2, a second auxiliary extruder 3 and a third auxiliary extruder 4. The main extruder 1 is provided with a main hopper 11 for adding polystyrene raw materials and auxiliary raw materials. The output end of the main extruder 1 is connected to a material conveying mechanism 6, and the material conveying mechanism 6 is connected to a shaping die 5. The output end of the main extruder 1 can extrude the molten main material to the material conveying mechanism 6. The first auxiliary extruder 2 is provided with a first hopper 21 for adding reinforcing raw materials. The first auxiliary extruder 2 is provided with a first hopper 22 for adding reinforcing raw materials. The output end of the first auxiliary extruder 2 is capable of extruding a reinforcing material. The output end of the first auxiliary extruder 2 is connected to the output end of the main extruder 1. The second auxiliary extruder 3 is provided with a second hopper 31 for adding the first surface raw material. The second auxiliary extruder 3 is communicated with the material conveying mechanism 6. The output end of the second auxiliary extruder 3 is capable of extrude a first surface layer material to the material conveying mechanism 6. The third auxiliary extruder 4 is provided with a third hopper 41 for adding the second surface raw material. The third auxiliary extruder 4 is communicated with the material conveying mechanism 6. The output end of the third auxiliary extruder 4 is capable of extrude a second surface layer material to the material conveying mechanism 6.

[0031] Specifically, the main extruder 1, the second auxiliary extruder 3 and the third auxiliary extruder 4 are all connected to the material conveying mechanism 6, and the material conveying mechanism 6 is connected to the shaping mold 5. The main extruder 1 is provided with a main hopper 11, so that the polystyrene foaming raw material and other auxiliary raw materials can be added to the main hopper 11. The main extruder 1 processes the polystyrene foaming raw material and other auxiliary raw materials, and conveys the molten main raw material from the output end of the main extruder 1 to the material conveying mechanism 6. The first auxiliary extruder 2 is provided with a first hopper 21, so that the reinforcement raw material can be added to the first hopper 21. The reinforcement raw material can be carbon fiber, glass fiber and other materials. The first auxiliary extruder 2 processes the reinforcement raw material. The output end of the first auxiliary extruder 2 is connected to the output end of the main extruder 1, and the molten reinforcement material is conveyed from the output end of the first auxiliary extruder 2 to the material conveying mechanism 6. The second auxiliary extruder 3 is provided with a second hopper 31, so that the first surface raw material can be added to the second hopper 31. The first surface raw material can be materials such as PVC and ASA. The second auxiliary extruder 3 processes the first surface raw material and transports the molten first surface raw material from the output end of the second auxiliary extruder 3 to the material conveying mechanism 6. The third auxiliary extruder 4 is provided with a third hopper 41, so that the second surface raw material can be added to the third hopper 41. The second surface raw material can be materials such as PE, PVC, and ASA. The third auxiliary extruder 4 processes the second surface raw material and transports the molten second surface raw material from the output end of the third auxiliary extruder 4 to the material conveying mechanism 6.

[0032] In this embodiment, during use, the process flow of the two-layer co-extruded polystyrene composite board preparation device is as follows:

[0033] In the first step, polystyrene foaming raw materials and other auxiliary raw materials are added to the main hopper 11, and the reinforcing raw materials are added to the first hopper 21. The main extruder 1 and the first auxiliary extruder 2 work synchronously to achieve co-extrusion. The co-extrusion technology is a prior art and will not be described in detail. The main extruder 1 extrude the main material (polystyrene foam material), and the first auxiliary extruder 2 extrude the reinforcing material and mix it with the main material (polystyrene foam material). In this way, the core material mixture of the main material and the reinforcing material can be transported to the shaping mold 5 through the material conveying mechanism 6, and is processed by subsequent equipment to form the core material 71. At this time, the core material 71 has the reinforcing material, which can increase the strength of the core material 71.

[0034] In the second step, after the core material 71 is formed, a first co-extruded layer 73 is co-extruded on the surface of the core material 71 through the second auxiliary extruder 3 and the material conveying mechanism 6. The first co-extruded layer 73 is formed sequentially along each surface of the core material 71.

[0035] In the third step, after the first co-extruded layer 73 is formed, a second co-extruded layer 74 is formed on the surface of the first co-extruded layer 73 through the third auxiliary extruder 4 and the material conveying mechanism 6 . The second co-extruded layer 74 is located on the surface of the first co-extruded layer 73 .

[0036] In the fourth step, the material is embossed, cooled and formed through corresponding equipment to obtain the final high-strength foam floor material.

[0037] The present invention provides a device for preparing a two-layer co-extruded polystyrene composite board 7, comprising a main extruder 1, a first auxiliary extruder 2, a second auxiliary extruder 3 and a third auxiliary extruder 4. The output end of the main extruder 1 is capable of extruding a molten material, and the output end of the first auxiliary extruder 2 is capable of extruding a reinforcing material. The main extruder 1 and the first auxiliary extruder 2 work synchronously to achieve co-extrusion. The first auxiliary extruder 2 extrudes the reinforcing material and mixes it into the main material (polystyrene foaming material). In this way, the core material 71 mixture of the main material and the reinforcing material can be transported to the shaping die 5 through the material conveying mechanism 6 and processed by subsequent equipment to form the core material 71. The output end of the second auxiliary extruder 3 is capable of extruding a first surface layer material, thereby co-extruded on the surface of the core material 71 a first co-extruded layer 73, and the first co-extruded layer 73 is formed in sequence along each surface of the core material 71. The output end of the third sub-extruder 4 can extrude the second surface layer material, thereby co-extruded a first co-extruded layer 73 on the surface of the core material 71. The first co-extruded layer 73 is formed in sequence along each surface of the core material 71. The output end of the third sub-extruder 4 can extrude the second surface layer material. The second co-extruded layer 74 is located on the surface of the first co-extruded layer 73. In this way, the connection strength between the first co-extruded layer 73, the second co-extruded layer 74 and the core material 71 can be improved, and the reinforcing material can increase the strength of the composite plate 7.

[0038] In the embodiment provided by the present invention, preferably, the output end of the main extruder 1 is provided with a main control valve 12, and the main control valve 12 can open or close the output end of the main extruder 1, and the output end of the first auxiliary extruder 2 is provided with a first control valve 22, and the first control valve 22 can open or close the output end of the second auxiliary extruder 3. When the main control valve 12 and the first control valve 22 are in the open state, the main extruder 1 and the first auxiliary extruder 2 can co-extrude the core material 71 mixture, and during use, the main extruder 1 and the first auxiliary extruder 2 can control the output material, so that the proportion of the reinforcing material in the core material 71 mixture can meet the requirements.

[0039] In the embodiment provided by the present invention, preferably, the output end of the second sub-extruder 3 is provided with a second control valve 32, and the second control valve 32 can open or close the output end of the second sub-extruder 3, and the output end of the third sub-extruder 4 is provided with a third control valve 42, and the third control valve 42 can open or close the output end of the third sub-extruder 4.

[0040] In another embodiment provided by the present invention, preferably, the shaping mold 5 includes a mold body 51, an internal cavity 52 is arranged inside the mold body 51, and a reinforcement cavity 53 is also arranged inside the mold body 51, and the reinforcement cavity 53 is located inside the internal cavity 52, and the shape and size of the internal cavity 52 are set corresponding to the shape and size of the plate, and the reinforcement cavity 53 is located inside the internal cavity 52, and the reinforcement cavity 53 and the internal cavity 52 are two independent chambers, and the internal cavity 52 can convey the core material mixture, and the reinforcement cavity 53 can convey the reinforcement material.

[0041] In another embodiment provided by the present invention, preferably, a first annular cavity 54 is provided on the mold body 51, and the first annular cavity 54 is provided around the internal cavity 52. The first annular cavity 54 and the internal cavity 52 are two chambers separated from each other. A second annular cavity 55 is also provided on the mold body 51, and the second annular cavity 55 is provided around the first annular cavity 54. The second annular cavity 55 and the second annular cavity 55 are also two chambers separated from each other.

[0042] In another embodiment provided by the present invention, preferably, a core material flow channel 56, a reinforcing core flow channel 57, a first layer material flow channel 58 and a second layer material flow channel 59 are provided on the mold body 51, the core material flow channel 56 is connected to the internal cavity 52, the reinforcing core flow channel 57 is connected to the reinforcing cavity 53, the first annular cavity 54 is connected to the first layer material flow channel 58, the second layer material flow channel 59 is connected to the second annular cavity 55, and the material conveying mechanism 6 is internally provided with a first conveying channel 61 and a second conveying channel 62, the first conveying channel 61 is connected to the core material flow channel 56 The other end of the first conveying channel 61 is connected to the output end of the main extruder 1, the second conveying channel 62 is connected to the reinforcing core flow channel 57, the other end of the second conveying channel 62 is connected to the output end of the first auxiliary extruder 2, and the output end of the first auxiliary extruder 2 is also connected to the output end of the main extruder 1, so that the internal cavity 52, the core material flow channel 56, the first conveying channel 61 and the output end of the main extruder 1 are connected in sequence, and the reinforcing cavity 53, the reinforcing core flow channel 57, the second conveying channel 62 and the output end of the first auxiliary extruder 2 are connected in sequence.

[0043] In another embodiment provided by the present invention, preferably, a third conveying channel 63 is provided inside the material conveying mechanism 6, one end of the third conveying channel 63 is connected to the first layer material flow channel 58, and the other end of the third conveying channel 63 is connected to the output end of the second sub-extruder 3, so that the first annular cavity 54, the first layer material flow channel 58, the third conveying channel 63 and the output end of the second sub-extruder 3 are connected in sequence.

[0044] In another embodiment provided by the present invention, preferably, a fourth conveying channel 64 is provided inside the material conveying mechanism 6, one end of the fourth conveying channel 64 is connected to the second-layer material flow channel 59, and the other end of the fourth conveying channel 64 is connected to the output end of the third sub-extruder 4; in this way, the second annular cavity 55, the second-layer material flow channel 59, the fourth conveying channel 64 and the output end of the third sub-extruder 4 are connected in sequence.

[0045] In another embodiment provided by the present invention, during use, the process flow of the device for preparing a two-layer co-extruded polystyrene composite board is as follows:

[0046] In the first step, polystyrene foaming raw materials and other auxiliary raw materials are added to the main hopper 11, and the reinforcing raw materials are added to the first hopper 21. The main extruder 1 and the first auxiliary extruder 2 work synchronously to realize co-extrusion. The main extruder 1 extrude the main material (polystyrene foaming material), and the first auxiliary extruder 2 extrude and mix part of the reinforcing material into the main material (polystyrene foaming material). In this way, the core material mixture of the main material and the reinforcing material can be transported to the internal cavity 52 through the output end of the main extruder 1, the first conveying channel 61, and the core material 71 flow channel 56, and the core material 71 is formed through the internal cavity 52. At the same time, the first auxiliary extruder 2 conveys part of the reinforcing material from the output end along the second conveying channel 62 and the reinforcing core flow channel 57 to the reinforcing cavity 53, so that a reinforcing rib 72 is formed at the center of the core material 71 to increase the strength of the core material 71.

[0047] In the second step, after the core material 71 is formed, a first co-extruded layer 73 is co-extruded on the surface of the core material 71 through the second auxiliary extruder 3, the third conveying channel 63, the first layer material flow channel 58 and the first annular cavity 54. The first co-extruded layer 73 is formed in sequence along each surface of the core material 71.

[0048] In the third step, after the first co-extruded layer 73 is formed, a second co-extruded layer 74 is formed by co-extrusion on the surface of the first co-extruded layer 73 through the third auxiliary extruder 4, the fourth conveying channel 64, the second layer material flow channel 59 and the second annular cavity 55. The second co-extruded layer 74 is located on the surface of the first co-extruded layer 73.

[0049] In the fourth step, the material is embossed, cooled and formed through corresponding equipment to obtain the final high-strength foam floor material.

[0050] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A two-layer co-extruded polystyrene composite board preparation device, characterized in that: include: A main extruder, wherein the main extruder is provided with a main hopper for adding polystyrene raw materials and auxiliary raw materials, the output end of the main extruder is connected to a material conveying mechanism, the material conveying mechanism is connected to a shaping die, and the output end of the main extruder is capable of extruding the molten main material into the material conveying mechanism; a first auxiliary extruder, wherein the first auxiliary extruder is provided with a first hopper for adding a reinforcing raw material, an output end of the first auxiliary extruder is capable of extruding the reinforcing material, and the output end of the first auxiliary extruder is connected to the output end of the main extruder; a second auxiliary extruder, wherein the second auxiliary extruder is provided with a second hopper for adding the first surface raw material, the second auxiliary extruder is connected to the material conveying mechanism, and the output end of the second auxiliary extruder is capable of extruding the first surface layer material to the material conveying mechanism; The third auxiliary extruder is provided with a third hopper for adding the second surface raw material. The third auxiliary extruder is connected to the material conveying mechanism. The output end of the third auxiliary extruder can extrude the second surface layer material to the material conveying mechanism.

2. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 1, characterized in that: The output end of the main extruder is provided with a main control valve, and the output end of the first auxiliary extruder is provided with a first control valve. When the main control valve and the first control valve are in an open state, the main extruder and the first auxiliary extruder can co-extrude the core material mixture.

3. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 1, characterized in that: The output end of the second secondary extruder is provided with a second control valve, and the output end of the third secondary extruder is provided with a third control valve.

4. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 1, characterized in that: The shaping mold comprises a mold body, an internal mold cavity and a reinforcement mold cavity are arranged inside the mold body, and the reinforcement mold cavity is located inside the internal mold cavity.

5. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 4, characterized in that: The mold body is provided with a first annular cavity, and the first annular cavity is arranged around the internal cavity.

6. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 5, characterized in that: The mold body is further provided with a second annular cavity, which is arranged around the first annular cavity.

7. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 6, characterized in that: The mold body is provided with a core material flow channel, a reinforcement core flow channel, a first layer material flow channel and a second layer material flow channel. The core material flow channel is connected to the internal cavity, the reinforcement core flow channel is connected to the reinforcement cavity, the first annular cavity is connected to the first layer material flow channel, and the second layer material flow channel is connected to the second annular cavity.

8. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 7, characterized in that: A first conveying channel and a second conveying channel are provided inside the material conveying mechanism. The first conveying channel is connected to the core material flow channel, and the other end of the first conveying channel is connected to the output end of the main extruder. The second conveying channel is connected to the reinforcing core flow channel, and the other end of the second conveying channel is connected to the output end of the first auxiliary extruder.

9. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 8, characterized in that: A third conveying channel is provided inside the material conveying mechanism, one end of the third conveying channel is connected to the first layer material flow channel, and the other end of the third conveying channel is connected to the output end of the second auxiliary extruder.

10. The device for preparing a two-layer co-extruded polystyrene composite board according to claim 9, characterized in that: A fourth conveying channel is further provided inside the material conveying mechanism, one end of the fourth conveying channel is connected to the second layer material flow channel, and the other end of the fourth conveying channel is connected to the output end of the third auxiliary extruder.

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