Multi-layer co-extrusion PET plastic sheet production line

Abstract

The invention relates to the technical field of plastic processing, and particularly discloses a multi-layer co-extrusion PET plastic sheet production line which comprises a support, a mounting frame and a feeding assembly are fixedly mounted at the top of the support, a die head assembly and a pressing assembly are arranged in the mounting frame, the die head assembly comprises a supporting seat, and three storage bins are slidably connected into the supporting seat; three adjusting mechanisms are arranged in the supporting seat; multi-layer materials extruded by the die head assembly enter the space between the two transmission belts in a guiding mode, sheets enter the gap between the two transmission belts under the extrusion effect of the arc-shaped parts of the transmission belts, stable attachment of the multi-layer sheets is achieved by means of the elasticity of the two transmission belts, and in the process, the sheets are compacted while being moved, and meanwhile the sheets are compacted. And the cooling plate can cool the sheets, support the transmission belt and prevent the transmission belt from deforming to influence the compaction effect of the sheets, so that the sheets are compacted and cooled more conveniently and efficiently, and the production quality and efficiency of the multi-layer sheets are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, in particular to a multi-layer co-extruded PET plastic sheet production line. Background Art

[0002] The multi-layer co-extrusion PET plastic sheet production line is a complex equipment combination for producing PET (polyethylene terephthalate) sheets with multi-layer structures. It can make PET materials with different characteristics or other compatible materials into multi-layer composite sheets under process control through co-extrusion technology to meet the diverse product performance requirements. It is widely used in many fields such as food packaging, medical packaging, and electronic packaging.

[0003] At present, the multi-layered PET sheet mainly relies on a multi-layer co-extrusion die to achieve the layering effect of different PET materials, and then relies on a pressure roller to compact the layers. However, the temperature of the material just extruded from the die is relatively high and cannot be cooled quickly, and it still retains a certain softness. During the compaction process of the pressure roller, the soft material will fall on the outside of the pressure roller under the action of its own gravity and move with the rotation of the pressure roller, thereby interfering with the compaction operation of the pressure roller and affecting the normal forming of the sheet. The hardness of the material increases and the plasticity decreases after cooling, making it difficult for the layers to fully fit and compact, resulting in easy stratification problems after the sheet is formed, which seriously affects the quality of the finished product.

[0004] Therefore need to provide a kind of multi-layer co-extruded PET plastic sheet production line, be aimed at solving the above-mentioned problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a multi-layer co-extrusion PET plastic sheet production line, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A multi-layer co-extruded PET plastic sheet production line, comprising a bracket, a mounting frame and a feeding assembly are fixedly mounted on the top of the bracket, a die assembly and a pressing assembly are arranged inside the mounting frame, the die assembly comprises a support seat, three storage bins are slidably connected inside the support seat, three adjustment mechanisms are arranged inside the support seat, the pressing assembly comprises a symmetrically arranged pressing mechanism, a trimming mechanism and an adjustment mechanism, and a driving mechanism is arranged between two of the pressing mechanisms;

[0008] The material pressing mechanism includes a driving roller and a driven roller rotatably connected to the mounting frame, a transmission belt is connected between the driving roller and the driven roller, and the material of the transmission belt is Teflon;

[0009] The adjustment mechanism includes a movable seat symmetrically slidably connected to the mounting frame, the tops of the two movable seats are fixedly connected to a support block, a cooling plate located in the transmission belt is fixedly connected between the two support blocks, a cooling pipe is fixedly installed inside the cooling plate, a bidirectional screw rod is rotatably connected inside the mounting frame, a spiral pair is formed between the movable seat and the bidirectional screw rod, and a gear is fixedly connected to the outside of the bidirectional screw rod;

[0010] The support seat is symmetrically and fixedly connected with a rack inside, the gear and the rack are meshed with each other, and both ends of the driving roller and the driven roller are rotatably connected to the inside of the movable seat;

[0011] The outer side of the support seat is symmetrically fixedly connected with a fixing block, the inner side of the mounting frame is symmetrically fixedly connected with an electric push rod, and the telescopic end of the electric push rod is fixedly connected to the fixing block.

[0012] As a further improvement of the above scheme, an extrusion assembly is arranged on the top of the bracket, and the extrusion assembly includes a discharge seat fixedly connected to the upper surface of the bracket, and three extruders and three discharge hoppers are fixedly connected to the adjacent outer sides of the discharge seat respectively, and a telescopic tube is fixedly connected to the side of the extruder close to the storage bin, and the telescopic tubes are fixedly connected to the storage bin.

[0013] As a further improvement of the above scheme, the adjustment mechanism includes a mounting plate symmetrically fixedly connected to the storage bin, an extrusion plate is symmetrically slidably connected inside the storage bin, a spring is evenly fixedly connected between the mounting plate and the extrusion plate, a wedge block is fixedly connected to one side of the extrusion plate close to the mounting plate, and a fixing rod is evenly fixedly connected to the inside of the support seat, and the fixing rods are all located between the mounting plate and the extrusion plate.

[0014] As a further improvement of the above solution, the interior of the support seat is slidably connected with guide plate 1, guide plate 2 and guide plate 3 in sequence from top to bottom, and the guide plate 1, guide plate 2 and guide plate 3 are all fixedly connected to the extrusion plate.

[0015] As a further improvement of the above solution, limiting rods are passed through the four corners of the mounting plate, and the limiting rods pass through spring 1 and are fixedly connected to the extrusion plate.

[0016] As a further improvement of the above scheme, the driving mechanism includes a fixing plate symmetrically fixedly connected to the outer wall of the mounting frame, a servo motor is fixedly connected to the bottom of the fixing plate, a driving shaft is rotatably connected between the two fixing plates, the bottom of the driving shaft is fixedly connected to the output end of the servo motor through a coupling, a worm is symmetrically fixedly connected to the outer side of the driving shaft, a worm wheel is fixedly connected to the outer side of each driving roller, and the worm wheel and the worm are meshed with each other.

[0017] As a further improvement of the above scheme, the trimming mechanism includes a fixed plate symmetrically rotatably connected to the inner wall of the mounting frame, a mounting sleeve is fixedly connected to the interior of the fixed plate, a blade is fixedly connected to one end of the mounting sleeve close to the transmission belt, and a gap is provided between the fixed plate and the blade.

[0018] As a further improvement of the above scheme, a guide sleeve is symmetrically fixedly connected to the outer side of the driving roller, a slide rod is slidably connected to the inside of the guide sleeve, the slide rod is slidably connected to the mounting sleeve through a connecting block, and a spring 2 is fixedly connected between the guide sleeve and the connecting block.

[0019] As a further improvement of the above solution, a fixing strip is fixedly connected to the outer side of the mounting frame, a protective cover is fixedly connected to the outer side wall of the fixing strip, and the protective cover is sleeved on the outer side of the blade.

[0020] As a further improvement of the above solution, the outer sides of the driven rollers are symmetrically fixedly connected with limit disks, and the adjacent sides of the two limit disks are both in contact with the transmission belt.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The multi-layer material extruded from the die assembly is guided into the space between the two transmission belts. Under the extrusion of the arc-shaped part of the transmission belt, the sheet smoothly enters the gap between the two, and with the help of the elasticity of the two transmission belts, the stable fitting of the multi-layer sheet is achieved. In this process, the sheet is compacted while moving, while the cooling plate can cool the sheet and provide support for the transmission belt to prevent the deformation of the transmission belt from affecting the compaction effect of the sheet, thereby achieving more convenient and efficient compaction and cooling of the sheet, thereby ensuring the quality and efficiency of multi-layer sheet production.

[0023] 2. By moving the support seat, the fixed rod drives the extrusion plate to move, so that the two extrusion plates in the storage bin will move towards each other, so as to adjust the gap between them to meet the processing requirements of different sheet thicknesses. At the same time, the movement of the support seat can make the upper and lower transmission belts move synchronously with the help of the adjustment mechanism, so as to cooperate with the die head assembly to compact sheets of different thicknesses, ensuring that sheets of various thicknesses can be produced with high quality and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the mounting frame of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the mounting frame of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the die head assembly and the material pressing assembly of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the support base of the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of the support base of the present invention;

[0031] Figure 7 For the present invention Figure 6 The structural diagram at A in the middle;

[0032] Figure 8 It is a structural schematic diagram of the material pressing mechanism of the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the driving mechanism of the present invention;

[0034] Fig.10 It is a structural schematic diagram of the adjustment mechanism of the present invention;

[0035] Fig.11 It is a schematic diagram of the internal structure of the cooling plate of the present invention;

[0036] Fig.12 It is a structural schematic diagram of the trimming structure of the present invention.

[0037] In the figure: 1, bracket; 2, extrusion assembly; 21, feed base; 22, extruder; 23, feed hopper; 24, telescopic tube; 3, mounting frame; 4, die assembly; 41, support base; 42, storage bin; 431, fixed block; 432, electric push rod; 441, guide plate 1; 442, guide plate 2; 443, guide plate 3; 45, adjustment mechanism; 451, mounting plate; 452, fixed rod; 453, extrusion plate; 454, limit rod; 455, spring 1; 456, wedge block; 5, pressing assembly; 51, pressing mechanism; 511, transmission belt; 512, driving roller; 513, from Moving roller; 514, limiting plate; 52, trimming mechanism; 521, fixed plate; 522, fixed strip; 523, protective cover; 524, blade; 525, mounting sleeve; 526, guide sleeve; 527, spring 2; 528, connecting block; 529, slide rod; 53, driving mechanism; 531, servo motor; 532, fixed plate; 533, driving shaft; 534, worm gear; 535, worm; 54, adjusting mechanism; 541, supporting block; 542, movable seat; 543, rack; 544, gear; 545, bidirectional screw; 546, cooling plate; 547, cooling pipe; 6, feeding assembly. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 12 As shown, the present invention provides an embodiment: a multi-layer co-extruded PET plastic sheet production line, comprising a bracket 1, a mounting frame 3 and a feeding assembly 6 are fixedly mounted on the top of the bracket 1, a die assembly 4 and a pressing assembly 5 are arranged inside the mounting frame 3, the die assembly 4 comprises a support seat 41, three storage bins 42 are slidably connected inside the support seat 41, three adjustment mechanisms 45 are arranged inside the support seat 41, the pressing assembly 5 comprises a symmetrically arranged pressing mechanism 51, a trimming mechanism 52 and an adjustment mechanism 54, and a driving mechanism 53 is arranged between the two pressing mechanisms 51;

[0040] The pressing mechanism 51 includes a driving roller 512 and a driven roller 513 which are rotatably connected to the mounting frame 3. A transmission belt 511 is connected between the driving roller 512 and the driven roller 513. The material of the transmission belt 511 is Teflon.

[0041] The adjustment mechanism 54 includes a movable seat 542 symmetrically slidably connected to the mounting frame 3, a support block 541 is fixedly connected to the top of each of the two movable seats 542, a cooling plate 546 located in the transmission belt 511 is fixedly connected between the two support blocks 541, a cooling pipe 547 is fixedly installed inside the cooling plate 546, a bidirectional screw rod 545 is rotatably connected inside the mounting frame 3, a spiral pair is formed between the movable seat 542 and the bidirectional screw rod 545, and a gear 544 is fixedly connected to the outer side of the bidirectional screw rod 545;

[0042] A rack 543 is symmetrically fixedly connected inside the support seat 41, and the gear 544 and the rack 543 are meshed with each other. Both ends of the driving roller 512 and the driven roller 513 are rotatably connected to the inside of the movable seat 542;

[0043] A fixing block 431 is symmetrically fixedly connected to the outer side of the support seat 41 , and an electric push rod 432 is symmetrically fixedly connected to the inner side of the mounting frame 3 . The telescopic end of the electric push rod 432 is fixedly connected to the fixing block 431 .

[0044] In practical application, the embodiment of the present invention is as follows: Figure 2 , Figure 5 and Figure 6 As shown, in the die assembly 4, the support base 41 provides stable support for the entire die structure, and the three storage bins 42 slidably connected therein can respectively store different materials for forming multi-layer PET sheets, and the three adjustment mechanisms 45 provided in the support base 41 can regulate the extrusion process of the material to complete the adjustment of production of different thicknesses;

[0045] like Figure 2 , Figure 4 , Figure 8 and Fig.11 As shown, after the material is extruded from the storage bin 42, the multi-layer material will move toward the pressing assembly 5 and enter between the two transmission belts 511. Under the extrusion of the arc-shaped part of the transmission belt 511, the sheet smoothly enters the gap between the two, and with the help of the elasticity of the two transmission belts 511 themselves, the multi-layer sheet is stably fitted. In this process, while the sheet is moving and compacted, the cooling plate 546 can cool the sheet and provide support for the transmission belt 511 to prevent the deformation of the transmission belt 511 from affecting the compaction effect of the sheet. The transmission belt 511 is made of high-temperature resistant, low-friction Teflon material, which can better adapt to the high-temperature multi-layer material extruded from the die assembly 4, and avoid excessive adhesion between the material and the transmission belt 511, so as to ensure the smooth movement of the sheet during the compaction process.

[0046] like Figure 4 , Figure 5 and Figure 8As shown, during the pressing process, the movement of the support seat 41 drives the bidirectional screw 545 to rotate through the meshing rack 543 and the gear 544. Since a spiral pair is formed between the bidirectional screw 545 and the movable seat 542, the bidirectional screw 545 can drive the upper and lower movable seats 542 to move toward each other. The movable movable seat 542 drives the transmission belt 511 through the driving roller 512 and the driven roller 513, so that the upper and lower transmission belts 511 move synchronously, thereby cooperating with the die head assembly 4 to compact sheets of different thicknesses.

[0047] like Figure 2 and Figure 5 As shown, the fixed block 431 symmetrically fixedly connected to the outside of the support seat 41 cooperates with the electric push rod 432 symmetrically fixedly connected to the inside of the mounting frame 3 to control the position of the support seat 41 so as to complete the adjustment of the production requirements of sheets of different thicknesses and improve the adaptability of the overall production.

[0048] like Figure 2 and Figure 3 As shown, the driving mechanism 53 arranged between the two pressing mechanisms 51 provides power for the driving roller 512 to ensure the stable operation of the transmission belt 511 and realize the continuous compaction of the sheet, while the trimming mechanism 52 can trim the compacted sheet to remove the excess part and produce high-quality multi-layer co-extruded PET plastic sheet.

[0049] like Figure 1 and Figure 2 As shown, an extrusion assembly 2 is provided on the top of the bracket 1, and the extrusion assembly 2 includes a discharge seat 21 fixedly connected to the upper surface of the bracket 1, and three extruders 22 and three discharge hoppers 23 are fixedly connected to the adjacent outer sides of the discharge seat 21, and a telescopic tube 24 is fixedly connected to the side of the extruder 22 close to the storage bin 42, and the telescopic tubes 24 are fixedly connected to the storage bin 42.

[0050] In actual application of the embodiment of the present invention, different extruders 22 can heat, plasticize, and process the materials in their respective hoppers 23 according to the requirements of producing multi-layer PET sheets, and then accurately transport them to the corresponding storage bin 42 through the telescopic tube 24. In addition, the arrangement of three extruders 22 and three hoppers 23 meets the requirements of multi-layer sheets for different materials, so that the production line can flexibly produce multi-layer PET sheet products with various functions and performance requirements.

[0051] like Figure 6 and Figure 7As shown, the adjustment mechanism 45 includes a mounting plate 451 symmetrically fixedly connected to the storage bin 42, an extrusion plate 453 is symmetrically slidably connected inside the storage bin 42, a spring 1 455 is evenly fixedly connected between the mounting plate 451 and the extrusion plate 453, a wedge block 456 is fixedly connected to the side of the extrusion plate 453 close to the mounting plate 451, a fixing rod 452 is evenly fixedly connected inside the support seat 41, and the fixing rods 452 are all located between the mounting plate 451 and the extrusion plate 453, and a guide plate 1 441, a guide plate 2 442 and a guide plate 3 443 are slidably connected inside the support seat 41 from top to bottom in sequence, the guide plate 1 441, the guide plate 2 442 and the guide plate 3 443 are all fixedly connected to the extrusion plate 453, and the four corners of the mounting plate 451 are penetrated by limiting rods 454, and the limiting rods 454 penetrate the spring 1 455 and are fixedly connected to the extrusion plate 453.

[0052] When the embodiment of the present invention is applied in practice, when it is necessary to adjust the thickness of sheet material processing, the electric push rod 432 is started to drive the support seat 41 to move through the fixed block 431, and the moving support seat 41 drives the fixed rod 452 to squeeze the wedge block 456, so that the wedge block 456 drives the extrusion plate 453 to move under the limit of the four limit rods 454, and stretches the spring 1 455 to store elastic potential energy, so as to adjust the gap between the two extrusion plates 453 in the storage bin 42, so that the material extruded from the storage bin 42 can be adjusted along the gap between the extrusion plates 453 to complete the thickness adjustment, and the extrusion plate 453 can drive the guide plate 1 441, the guide plate 2 442 and the guide plate 3 443 to move synchronously during the movement, so as to ensure the uniformity of the thickness of the extruded material. When it is necessary to adjust it back, the electric push rod 432 is started to drive the support seat 41 to reset, so that the extrusion plate 453 can be reset under the elastic action of the spring 1 455.

[0053] like Figure 3 , Figure 8 and Fig.12 As shown, the driving mechanism 53 includes a fixing plate 532 symmetrically fixedly connected to the outer wall of the mounting frame 3, a servo motor 531 is fixedly connected to the bottom of the fixing plate 532, a driving shaft 533 is rotatably connected between the two fixing plates 532, the bottom of the driving shaft 533 is fixedly connected to the output end of the servo motor 531 through a coupling, a worm 535 is symmetrically fixedly connected to the outer side of the driving shaft 533, and a worm wheel 534 is fixedly connected to the outer side of the driving roller 512, and the worm wheel 534 and the worm 535 are meshed with each other.

[0054] When the embodiment of the present invention is actually used, when the pressing mechanism 51 is driven by the adjustment mechanism 54 to adjust its position, the worm wheel 534 on the driving roller 512 rolls on the worm 535. When the adjustment is completed, starting the servo motor 531 can drive the driving shaft 533 to rotate synchronously. The driving shaft 533 drives the driving roller 512 to rotate through the meshing connection between the worm 535 and the worm wheel 534. Since the worm 535 is symmetrically arranged, the two driving rollers 512 can rotate in different directions, so as to drive the two transmission belts 511 to rotate and drive the sheet to move and compact.

[0055] like Fig.12 As shown, the trimming mechanism 52 includes a fixed plate 521 symmetrically rotatably connected to the inner wall of the mounting frame 3, a mounting sleeve 525 is fixedly connected inside the fixed plate 521, a blade 524 is fixedly connected to one end of the mounting sleeve 525 close to the transmission belt 511, a gap is provided between the fixed plate 521 and the blade 524, a guide sleeve 526 is symmetrically fixedly connected to the outer side of the driving roller 512, a slide bar 529 is slidably connected inside the guide sleeve 526, the slide bar 529 is slidably connected to the mounting sleeve 525 through a connecting block 528, a spring 527 is fixedly connected between the guide sleeve 526 and the connecting block 528, a fixed bar 522 is fixedly connected to the outer side of the mounting frame 3, a protective cover 523 is fixedly connected to the outer wall of the fixed bar 522, and the protective cover 523 is sleeved on the outer side of the blade 524.

[0056] When the embodiment of the present invention is actually used, during the position adjustment process of the pressing mechanism 51, the driving roller 512 is slidably connected with the guide sleeve 526 and the slide rod 529 to achieve position adjustment, and will not affect the cutting position of the fixed plate 521 and the blade 524. When the plate passes through the two blades 524, it will move into between the two blades 524 under the drive of the transmission belt 511 and complete the cutting, thereby ensuring the quality of the sheet after production.

[0057] like Fig.11 As shown, the outer side of the driven roller 513 is symmetrically fixedly connected to the limiting disk 514 , and the adjacent sides of the two limiting disks 514 are both in contact with the transmission belt 511 .

[0058] In actual application of the embodiment of the present invention, the transmission belt 511 can be limited by the fit between the limiting plate 514 and the transmission belt 511, ensuring that the transmission belt 511 does not deviate during rotation, further improving the production quality and efficiency of the device.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer co-extrusion PET plastic sheet production line, comprising a support (1), characterized in that: A mounting frame (3) and a feeding assembly (6) are fixedly mounted on the top of the support (1); a die assembly (4) and a material pressing assembly (5) are arranged inside the mounting frame (3); the die assembly (4) comprises a support seat (41); three material storage bins (42) are slidably connected inside the support seat (41); three adjustment mechanisms (45) are arranged inside the support seat (41); the material pressing assembly (5) comprises a material pressing mechanism (51), a trimming mechanism (52) and an adjustment mechanism (54) which are symmetrically arranged; a driving mechanism (53) is arranged between two of the material pressing mechanisms (51); The material pressing mechanism (51) comprises a driving roller (512) and a driven roller (513) which are rotatably connected to the mounting frame (3); a transmission belt (511) is connected between the driving roller (512) and the driven roller (513); the transmission belt (511) is made of Teflon; The adjustment mechanism (54) comprises a movable seat (542) symmetrically slidably connected to the mounting frame (3); the tops of the two movable seats (542) are fixedly connected to a support block (541); a cooling plate (546) located in the transmission belt (511) is fixedly connected between the two support blocks (541); a cooling pipe (547) is fixedly installed inside the cooling plate (546); a bidirectional screw rod (545) is rotatably connected inside the mounting frame (3); a spiral pair is formed between the movable seat (542) and the bidirectional screw rod (545) for rotation; and a gear (544) is fixedly connected to the outer side of the bidirectional screw rod (545); A rack (543) is symmetrically fixedly connected inside the support seat (41), the gear (544) and the rack (543) are meshed with each other, and both ends of the driving roller (512) and the driven roller (513) are rotatably connected to the inside of the movable seat (542); A fixing block (431) is symmetrically fixedly connected to the outside of the support seat (41), an electric push rod (432) is symmetrically fixedly connected to the inside of the mounting frame (3), and a telescopic end of the electric push rod (432) is fixedly connected to the fixing block (431).

2. A multi-layer co-extrusion PET plastic sheet production line according to claim 1, characterized in that: An extrusion assembly (2) is arranged on the top of the support (1), and the extrusion assembly (2) includes a material discharge seat (21) fixedly connected to the upper surface of the support (1), and three extruders (22) and three material discharge hoppers (23) are fixedly connected to adjacent outer sides of the material discharge seat (21), and a telescopic tube (24) is fixedly connected to the side of the extruder (22) close to the storage bin (42), and the telescopic tube (24) is fixedly connected to the storage bin (42).

3. A multi-layer co-extrusion PET plastic sheet production line according to claim 1, characterized in that: The adjustment mechanism (45) comprises a mounting plate (451) symmetrically fixedly connected to the material storage bin (42); an extrusion plate (453) is symmetrically slidably connected inside the material storage bin (42); a spring (455) is evenly fixedly connected between the mounting plate (451) and the extrusion plate (453); a wedge block (456) is fixedly connected to a side of the extrusion plate (453) close to the mounting plate (451); and a fixing rod (452) is evenly fixedly connected inside the support seat (41); the fixing rod (452) is located between the mounting plate (451) and the extrusion plate (453).

4. A multi-layer co-extrusion PET plastic sheet production line according to claim 3, characterized in that: The support seat (41) is slidably connected to a guide plate 1 (441), a guide plate 2 (442) and a guide plate 3 (443) in sequence from top to bottom, and the guide plate 1 (441), the guide plate 2 (442) and the guide plate 3 (443) are all fixedly connected to the extrusion plate (453).

5. A multi-layer co-extrusion PET plastic sheet production line according to claim 3, characterized in that: Limiting rods (454) are passed through the four corners of the mounting plate (451), and the limiting rods (454) pass through spring 1 (455) and are fixedly connected to the extrusion plate (453).

6. A multi-layer co-extrusion PET plastic sheet production line according to claim 2, characterized in that: The driving mechanism (53) comprises a fixing plate (532) symmetrically fixedly connected to the outer side wall of the mounting frame (3); a servo motor (531) is fixedly connected to the bottom of the fixing plate (532); a driving shaft (533) is rotatably connected between the two fixing plates (532); the bottom of the driving shaft (533) is fixedly connected to the output end of the servo motor (531) via a coupling; a worm (535) is symmetrically fixedly connected to the outer side of the driving shaft (533); a worm wheel (534) is fixedly connected to the outer side of each of the driving rollers (512); and the worm wheel (534) and the worm (535) are meshed with each other.

7. A multi-layer co-extrusion PET plastic sheet production line according to claim 3, characterized in that: The trimming mechanism (52) comprises a fixed disk (521) symmetrically rotatably connected to the inner wall of the mounting frame (3); a mounting sleeve (525) is fixedly connected inside the fixed disk (521); a blade (524) is fixedly connected to one end of the mounting sleeve (525) close to the transmission belt (511); and a gap is provided between the fixed disk (521) and the blade (524).

8. A multi-layer co-extrusion PET plastic sheet production line according to claim 7, characterized in that: A guide sleeve (526) is symmetrically and fixedly connected to the outside of the driving roller (512); a slide rod (529) is slidably connected to the inside of the guide sleeve (526); the slide rod (529) is slidably connected to the mounting sleeve (525) via a connecting block (528); and a second spring (527) is fixedly connected between the guide sleeve (526) and the connecting block (528).

9. A multi-layer co-extrusion PET plastic sheet production line according to claim 7, characterized in that: A fixing strip (522) is fixedly connected to the outside of the mounting frame (3), a protective cover (523) is fixedly connected to the outer side wall of the fixing strip (522), and the protective cover (523) is sleeved on the outside of the blade (524).

10. The multi-layer co-extrusion PET plastic sheet production line according to claim 1, characterized in that: The outer sides of the driven rollers (513) are symmetrically fixedly connected to the limiting disks (514), and the adjacent sides of the two limiting disks (514) are both in contact with the transmission belt (511).

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