CN116834345A

CN116834345A - Preparation method of high-strength PET core material and production line thereof

Info

Publication number: CN116834345A
Application number: CN202310750189.5A
Authority: CN
Inventors: 郑逸良; 曹敏华; 程振朔
Original assignee: Anhui Dongyuan New Materials Co ltd
Current assignee: Anhui Dongyuan New Materials Co ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-10-03

Abstract

The utility model discloses a preparation method and a production line of a high-strength PET core material. The preparation production line comprises an extrusion forming die, a plate cooling conveying line, a trimming mechanism, a cutting mechanism, a sanding machine, a first material covering machine, a heat sealing device, a dividing and cutting machine, a punching machine and a second material covering machine which are sequentially arranged. The PET core material obtained by the preparation method and the production line thereof has high strength, reduces the glue filling amount and can effectively reduce the weight of the PET core material.

Description

Preparation method of high-strength PET core material and production line thereof

Technical Field

The utility model relates to the field of PET (polyethylene terephthalate) plate processing, in particular to a preparation method and a production line of a high-strength PET core material.

Background

The PET plate is widely applied to wind blades at present as a lining core material due to the light weight, and epoxy resin and other materials are generally adopted for compounding the PET plate. In order to improve the strength of the PET plate, glue holes are added on the PET plate, epoxy resin can enter the glue holes to improve the strength of the PET plate, but the number of the glue holes is increased to cause weight increase, so that the balance point of the strength and the weight is required to meet the requirement of the wind blade on the core material. Along with the continuous extension of the length design of wind blade, the PET core material is required to be capable of ensuring lighter quality while improving the strength, thereby meeting the requirement of wind blade installation. For this reason, improvements are required in the processing method and processing equipment of the PET core material to obtain a PET core material having high strength and light weight.

Disclosure of Invention

The utility model aims to provide a preparation method and a production line of a high-strength PET core material, which solve the problems of low strength and heavy weight of the existing PET core material.

The technical scheme adopted for solving the technical problems is as follows: a preparation method of a high-strength PET core material and a production line thereof are provided, wherein the preparation method of the high-strength PET core material comprises the following steps:

s1: extruding the plate for molding, molding the PET plate through an extrusion molding die and cooling;

s2: cutting off, namely cutting off the PET plate according to the required length specification;

s3: coating, namely paving a layer of reinforcing fabric on one surface of the PET plate;

s4: heat sealing, namely, overlapping a plurality of PET plates and Xiang Re together through heat sealing equipment to form a PET cube, wherein one surface of two adjacent PET plates, which is paved with a reinforcing fabric, is heat-sealed with one surface of the other PET plate, which is not paved with the reinforcing fabric;

s5: and cutting along a vertical plane perpendicular to the extrusion direction to form the PET core material with the required thickness.

The following steps are further provided after the step S5:

s6: punching, namely punching along the extrusion direction to form a group of through holes penetrating through the upper surface and the lower surface of the PET core material;

s7: and (3) coating a bottom layer, and paving a layer of fabric on one side of the PET core material to serve as a bottom fabric.

And the trimming procedure of processing the two sides of the PET plate to be flat is also arranged before cutting in the step S2.

And a sanding procedure for processing the upper surface and the lower surface of the PET plate to be flat is further arranged before the step S3 of coating.

The production line of the high-strength PET core material comprises an extrusion molding die for extruding and molding PET plates, a plate cooling conveying line in butt joint with the extrusion molding die, and a cutting mechanism arranged on the plate cooling conveying line, wherein the discharge end of the plate cooling conveying line is connected with a first material covering machine for paving reinforcing fabrics on one surface of the PET plates, a heat sealing device for performing heat sealing on a plurality of PET plates to form PET cubes and a cutting machine for cutting the PET cubes sequentially through a conveying device;

in order to achieve continuity of coating and improve coating efficiency, the first coating machine comprises a coating material rack, a coating roller set arranged at the feeding end of the coating material rack, a turnover mechanism arranged on the coating material rack and used for overturning the PET plate paved with the reinforced fabric, and a fabric cutting mechanism used for cutting the folded reinforced fabric; the material pushing mechanism is also arranged for pushing the turned PET plate forwards;

further, the material covering roller set comprises a material covering lower supporting roller and a material covering upper pressing roller which are matched with each other to realize feeding, a gap for a PET plate to pass through is arranged between the material covering lower supporting roller and the material covering upper pressing roller, and the material covering roller set further comprises a material storage roller arranged above the material covering upper pressing roller; the turnover mechanism comprises rotating discs arranged on two sides of the material covering rack, swing arms with one ends fixed on the rotating discs, and turnover deflector rods connected with the other ends of the two swing arms; the fabric cutting mechanism comprises a cutting cutter and a cutter driving device, wherein the cutting cutter is erected on the covering material rack, and the cutter driving device drives the cutting cutter to move back and forth; the pushing mechanism comprises a pushing plate acting on one end of the turned PET plate and a pushing cylinder driving the pushing plate to move back and forth.

In order to realize feeding and cutting at the same time, the cutting mechanism comprises a movable frame which is arranged on a plate cooling conveying line and synchronously moves along with the plate, a first screw rod module is transversely arranged on the movable frame, a cutting motor is fixedly arranged on a movable sliding block of the first screw rod module, and the output end of the cutting motor is connected with a cutting blade; the movable frame is also provided with a front clamping roller set and a rear clamping roller set for clamping the plate.

In order to improve the strength of the PET core material and reduce the quality of the PET core material, a puncher for punching the sheet is arranged behind the splitting machine, and a second material covering machine with the same structure as the first material covering machine is arranged behind the puncher;

further, the punching machine comprises a punching frame, a conveying chain is arranged on the punching frame, a group of conveying guide wheels are arranged on the conveying chain, a group of punching support bars for supporting plates are arranged on the punching frame, a group of punching press plates matched with the punching support bars for clamping and fixing the plates are also arranged on the punching frame, and a lifting cylinder for controlling the punching press plates to move up and down is arranged on the punching frame;

further, the second lead screw module fixed in the punching frame is vertically arranged above the punching support bar, the punching fixing seat is fixedly arranged on the movable sliding block of the second lead screw module, at least one row of punching devices are arranged below the punching fixing seat, and each punching device comprises a punching motor and a punching drill bit arranged on the punching motor.

For guaranteeing the precision of punching, improve the density of punching, marching type the frame that punches is located the one end of clamp plate that punches still is provided with the spacing advancing mechanism that drives panel and move forward, spacing advancing mechanism is including two third lead screw modules that set up side by side, fixed mounting along with the centre gripping cylinder of slider round trip movement on third lead screw module slider, fixedly on the cylinder block of centre gripping cylinder be provided with down the grip block, the piston end of centre gripping cylinder is fixed to be provided with and realizes the last grip block of sheet clamp with lower grip block cooperation.

In order to level the two side surfaces of the PET plate, a trimming mechanism is arranged in front of the cutting mechanism on the plate cooling conveying line, the trimming mechanism comprises trimming seats symmetrically arranged on the two sides of the plate cooling conveying line, and a trimming milling cutter is vertically arranged on the trimming seats; the edge trimming seat is further provided with a limiting device for preventing the sheet from jumping up and down, the limiting device comprises a lower limiting supporting block, an upper limiting supporting block which is arranged corresponding to the lower limiting supporting block, and a group of guide wheels are arranged on the lower limiting supporting block and the upper limiting supporting block.

The utility model has the beneficial effects that: according to the method disclosed by the utility model, the PET plates are overlapped, the reinforcing fabric is added between the PET plates, the PET cubic blocks are formed by hot-pressing and compounding, and then the PET cubic blocks are divided into the PET core materials along the extrusion direction perpendicular to the PET plates, so that the structure can greatly improve the compression resistance, the tensile strength and the shearing strength of the PET core materials under the action of the drag force of the reinforcing fabric, meanwhile, the reinforcing fabric is light in weight, so that the weight of the PET core materials is not increased, the number of holes can be reduced, namely the amount of the injected epoxy resin is reduced, and the effect of weight reduction is achieved. The bottom fabric can strengthen the tensile strength of the PET core material, and meanwhile, the problem that the PET core material is scrapped due to the fact that the PET core material is broken under pressure in the carrying process can be solved, so that even if the PET core material is broken, the PET core material is connected together by the bottom fabric, and the installation and the use of the rear face are not affected. The glue holes can be filled with epoxy resin when the PET core material is compounded with other materials, so that the strength of the PET core material is further improved. In addition, the first material covering machine and the second material covering machine can realize continuous material covering and automatic cutting, and improve material covering efficiency; the cutting mechanism can realize conveying and cutting of the extruded PET plate, realize serialization and improve production efficiency; the punching step adopts a drilling mode, the inner wall of the drilled hole is smooth and smooth, and the opening part cannot be overturned and broken; the trimming mechanism can trim the side edges of the PET plates in order, so that the PET plates can be orderly stacked during heat sealing, and the side surfaces of the thermally synthesized PET cubes are kept flat.

The utility model will be described in more detail below with reference to the drawings and examples.

Drawings

FIG. 1 is a block diagram of the steps of the method of the present utility model.

FIG. 2 is a schematic diagram of a production line of the present utility model.

Fig. 3 is a perspective view of the cutting mechanism and trimming mechanism of the present utility model.

Fig. 4 is a front view of the cutting mechanism and trimming mechanism of the present utility model.

Fig. 5 is a perspective view of a first laminator in accordance with the utility model.

Fig. 6 is a front view of the first laminator in the present utility model.

FIG. 7 is a schematic diagram of a tape of the intermediate coating step of the present utility model.

Fig. 8 is a perspective view of the middle punch of the present utility model.

Fig. 9 is a front view of the middle punch of the present utility model.

Fig. 10 is a schematic view of the position of the limiting pushing mechanism of the middle punch of the present utility model.

Fig. 11 is an enlarged schematic view of the portion a of fig. 10 in the present utility model.

FIG. 12 is a schematic view of the direction of the PET cubes of the present utility model being slit.

Fig. 13 is a perspective view of a PET core material obtained by the present utility model.

Detailed Description

An embodiment, as shown in fig. 1 to 13, is a method for manufacturing a high-strength PET core material, comprising the steps of:

The following steps are further provided after the step S5:

To ensure that the above method is carried out, the method is described in detail below in connection with specific equipment:

the utility model provides a production line of high strength PET core, includes extrusion molding PET panel's extrusion molding die 1, with the panel cooling transfer chain 2 of extrusion molding die 1 butt joint, sets up shutdown mechanism 3 and deburring mechanism 9 on panel cooling transfer chain 2, the discharge end of panel cooling transfer chain 2 loops through conveyor connection and is provided with grinder 10, first material machine 4, heat sealing equipment 5, cutting machine 6, puncher 7 and second material machine 8 that covers.

Firstly, a long PET plate is extruded and molded through an extrusion molding die 1, then the long PET plate is conveyed to a trimming mechanism through a plate cooling conveying line 2 for trimming, two side surfaces of the PET plate are trimmed and flattened, and further the side surfaces of a PET cube formed by heat sealing are flattened. The trimming mechanism 9 comprises trimming seats 91 symmetrically arranged on two sides of the plate cooling conveying line 2, and a trimming milling cutter 92 driven by a driving motor is vertically arranged on the trimming seats 91. The trimming seat 91 is further provided with a limiting device for preventing the sheet from jumping up and down, the limiting device comprises a lower limiting support block 93 and an upper limiting support block 94 which is arranged corresponding to the lower limiting support block 93, the lower limiting support block 93 and the upper limiting support block 94 are respectively provided with a group of guide wheels 95, and a gap between the two groups of guide wheels 95 is matched with the thickness of the PET sheet.

In order to ensure that the PET sheet material extruded by the extrusion forming die 1 can be continuously conveyed forwards, a conveying traction device 11 is arranged at the feeding end of the trimming mechanism 9, the conveying traction device 11 comprises an upper traction roller 111 and a lower traction roller 112 which are arranged on the sheet material cooling conveying line 2, a gap between the upper traction roller 111 and the lower traction roller 112 is smaller than the thickness of the PET sheet material, and the upper traction roller 111 and the lower traction roller 112 synchronously rotate towards the conveying direction of the sheet material cooling conveying line 2. Since the extrusion force of the extrusion die 1 alone cannot push the extruded long PET sheet material to continuously forward transport, the PET sheet material needs to be driven to stably forward transport by the cooperation of the upper traction roller 111 and the lower traction roller 112.

The cutting mechanism 3 comprises a movable frame 31 which is arranged on the plate cooling conveying line 2 and synchronously moves along with the plate, and the movable frame 31 is driven by a fourth screw rod module 37 arranged on two sides of the plate cooling conveying line 2. The movable frame 31 is transversely provided with a first screw rod module 32, a movable sliding block of the first screw rod module 32 is fixedly provided with a cutting motor 33, the output end of the cutting motor 33 is connected with a cutting blade 34, and the cutting blade 34 is driven to transversely move through the first screw rod module 32 to cut off the PET plate. In order to prevent the PET plate from jumping up and down during cutting, the movable frame 31 is further provided with a front clamping roller set 35 and a rear clamping roller set 36 for clamping the plate, the front clamping roller set 35 comprises an upper clamping roller 351 and a lower clamping roller 352, a gap between the upper clamping roller 351 and the lower clamping roller 352 is matched with the thickness of the PET plate, the PET plate passes through the gap between the upper clamping roller 351 and the lower clamping roller 352, and the rear clamping roller set 36 has the same structure as the front clamping roller set 35.

In order to prevent the unstable heat seal caused by bubbles generated between the PET plates during heat sealing, the upper and lower surfaces of the PET plates are processed by a sander 10 after the PET plates are cut off so as to be flat. For a specific structure of the sander 10, reference may be made to patent number 2016103678472, and patent name "sander" is an utility model patent.

Before heat sealing, a reinforcing fabric is paved on one side of the PET plate through the first material covering machine 4 so as to improve compression resistance, tensile strength and shearing strength of the PET core material, and meanwhile, the glue filling quantity can be reduced, and the effect of weight reduction is achieved. The first material covering machine 4 comprises a material covering rack 41, and a material covering roller set 42 arranged at the feeding end of the material covering rack 41, wherein the material covering roller set 42 comprises a material covering lower supporting roller 421 and a material covering upper pressing roller 422 which are matched with each other to realize feeding, and the material covering lower supporting roller 421 and the material covering upper pressing roller 422 are both driving rollers; a gap for the PET plate to pass through is provided between the lower covered supporting roller 421 and the upper covered pressing roller 422, and the upper covered pressing roller 422 also comprises a storage roller 423 disposed above the upper covered pressing roller 422. The reinforcing fabric with glue is adhered to the upper surface of the PET plate by the lower covering supporting roller 421 and the upper covering pressing roller 422 and is conveyed forward, as shown in fig. 7, the reinforcing fabric is continuous and uninterrupted, a plurality of adjacent PET plates are adhered below the reinforcing fabric, and the reinforcing fabric is cut from between two adjacent PET plates by matching the folding mechanism 43 and the cutting mechanism 44.

The turnover mechanism 43 comprises a rotating disc 431 arranged on two sides of the material covering rack 41 and driven by a driving motor, a swing arm 432 with one end fixed on the rotating disc 431, and a turnover deflector 434 connected with the other ends of the two swing arms 432. As shown in fig. 7, the turning lever 434 is driven by the driving device to turn the foremost PET sheet 180 degrees upward from the position between the foremost PET sheet and the adjacent PET sheet, and presses the cutting blade 441 of the face fabric cutting mechanism 44. The fabric cutting mechanism 44 comprises a cutting cutter 441 arranged on the material covering frame 41 and a cutter driving device 442 for driving the cutting cutter 441 to move back and forth, the cutter driving device 442 is a screw rod module arranged on two sides of the material covering frame 41, and the cutter driving device 442 drives the cutting cutter 441 to move towards the conveying direction so as to cut the reinforced fabric. And then the PET plate which is positioned above and cut is pushed down by a pushing mechanism to realize material returning, wherein the pushing mechanism 45 comprises a push plate 451 acting on one end of the turned PET plate and a pushing cylinder 452 driving the push plate 451 to move back and forth.

After a reinforcing fabric is paved on one surface of the PET plates, the PET plates are subjected to heat sealing through a heat sealing device 5 to form PET cubes, and a layer of reinforcing fabric is arranged between every two layers of PET plates. The specific structure of the heat sealing device 5 can refer to the patent number 2020216489729 and the patent name of the utility model of a hot melting compound machine.

After the PET cubes are formed by heat sealing, the PET cores are cut into pieces by a cutter 9 according to the required thickness. As shown in fig. 12, the slitting is performed in a direction perpendicular to the extrusion direction of the PET sheet material.

In order to further ensure the strength of the PET core material, a group of through holes penetrating through the upper surface and the lower surface of the PET core material need to be processed on the PET core material for filling epoxy resin. The punch 7 comprises a punch frame 71, a conveying chain 72 arranged on the punch frame 71, a group of conveying guide wheels 721 are arranged on the conveying chain 72, PET core materials are placed on the conveying guide wheels 721, and the conveying chain 72 drives the conveying guide wheels 721 to further drive the PET core materials to be conveyed to the punch support bars 73. The punching machine frame 71 is provided with a group of punching support bars 73 for supporting plates, the punching machine frame 71 is also provided with a group of punching press plates 74 matched with the punching support bars 73 for clamping fixed plates, and the punching machine frame 71 is provided with lifting cylinders 741 for controlling the punching press plates 74 to move up and down. The punching press plate 74 is driven to move downwards by the lifting air cylinder 741, and the PET core material to be punched is firmly fixed on the punching support bar 73 for punching. The punching machine is characterized in that a second screw rod module 75 fixed on the punching frame 71 is vertically arranged above the punching support bar 73, a punching fixing seat 76 is fixedly arranged on a movable sliding block of the second screw rod module 75, at least one row of punching devices are arranged below the punching fixing seat 76, and each punching device comprises a punching motor 77 and a punching drill bit 771 arranged on the punching motor 77. The second screw rod module 75 drives the punching fixing seat 76 to move downwards, and then drives the punching drill 771 to move downwards to drill a through hole in the PET core material. Compared with the traditional mode of punching holes by using ejector pins, the hole punching method can effectively avoid flanging deformation of holes and ensure smoothness and smoothness of inner walls of the holes.

Because of the volume limitation of the punching motor 77, the dense punching motor 77 cannot be installed on the punching fixing seat 76, so that all the through holes cannot be drilled on the PET core material at one time, and then the punching is required to be performed in a step-by-step punching mode. The punching machine frame 71 is located the one end of punching clamp plate 74 and still is provided with the spacing advancing mechanism that drives panel and move forward, spacing advancing mechanism is including two third lead screw modules 78 that set up side by side, and fixed mounting is along with slider round trip movement's centre gripping cylinder 79 on the slider of third lead screw module 78, fixed lower grip block 791 that is provided with on the cylinder block of centre gripping cylinder 79, the piston end of centre gripping cylinder 79 is fixed to be provided with and realizes the last grip block 792 that the sheet presss from both sides tightly with lower grip block 791 cooperation. The PET core material is firmly clamped by the upper clamping block 792 and the lower clamping block 791, after one hole is punched, the PET core material is driven to be conveyed forwards by a step distance through the limiting pushing mechanism, the second hole punching is carried out, and the like according to the density of the required holes. Meanwhile, the PET core material can be fed and limited through the telescopic part 793 of the clamping cylinder 79, so that feeding accuracy is guaranteed.

The second material covering machine 8 is arranged behind the punching machine 7, the structure of the second material covering machine 8 is the same as that of the first material covering machine 4, and one layer of fabric is paved on one side of the PET core material through the second material covering machine 8 to serve as a bottom fabric, so that the strength of the PET core material is further improved.

The PET core material obtained by the present utility model has a structure as shown in fig. 13, including a plurality of layers of extruded sheets 100 stacked together, and reinforcing facings 200 sandwiched between the two layers of extruded sheets 100, and is fixed together by thermal compression compounding. During hot-press lamination, a hot-press weld 500 is formed between two layers of extruded sheets 100, and for convenience in description of performance in each direction of the PET core material, the direction perpendicular to the hot-press weld is defined as the X direction of the PET core material, the direction parallel to the weld is defined as the Y direction of the PET core material, and the extrusion direction of the extruded sheets 100 is defined as the Z direction of the PET core material. The reinforcing fabric 200 may be one or more of glass fiber cloth, carbon fiber cloth, mesh cloth and terylene cloth, and preferably biaxial glass fiber cloth or triaxial glass fiber cloth is adopted. In order to prevent the grooved PET core material from being crushed and damaged in the transportation process, the bottom surface of the PET core material is provided with a bottom fabric 300, and the bottom fabric 300 can be made of the same material as the reinforced fabric 200 or a common nylon fabric. Meanwhile, after the bottom fabric 300 is added, the tensile strength and the compressive strength of the PET core material in the X, Y direction can be enhanced.

The following table shows performance tests for the PET core material as a wind blade shell and web with and without reinforcing fabric, the reinforcing fabric using a composite tape scrim, where 1 represents the X direction, 2 represents the Y direction, 3 represents the Z direction, 12 represents the XY direction, 13 represents the XZ direction, and 23 represents the YZ direction following the tensile strength, compressive strength.

From the table it can be derived that: under the action of the drag force of the grid cloth, the PET core material can greatly improve the compression strength, the tensile strength and the shearing strength of the PET core material.

The PET core material is further provided with a group of glue holes 400, the glue holes 400 are through holes, and when the PET core material is compounded with other materials by adopting epoxy resin, the epoxy resin flows into the glue holes 400 to form a group of reinforced glue columns, so that the compression resistance and the tensile strength of the PET core material can be further improved.

The utility model is described above by way of example with reference to the accompanying drawings. It will be clear that the utility model is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present utility model; or the utility model is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the utility model.

Claims

1. The preparation method of the high-strength PET core material is characterized by comprising the following steps of:

2. The method for producing a high-strength PET core material according to claim 1, wherein: the following steps are further provided after the step S5:

3. The method for producing a high-strength PET core material according to claim 1, wherein: and the trimming procedure of processing the two sides of the PET plate to be flat is also arranged before cutting in the step S2.

4. The method for producing a high-strength PET core material according to claim 1, wherein: and a sanding procedure for processing the upper surface and the lower surface of the PET plate to be flat is further arranged before the step S3 of coating.

5. A preparation production line of high strength PET core material, its characterized in that: the PET plate cutting machine comprises an extrusion molding die (1) for extruding and molding PET plates, a plate cooling conveying line (2) in butt joint with the extrusion molding die (1), a cutting mechanism (3) arranged on the plate cooling conveying line (2), a first material covering machine (4) for paving reinforcing fabrics on one surface of the PET plates, a heat sealing device (5) for performing heat sealing on a plurality of PET plates to form PET cubes and a cutting machine (6) for cutting the PET cubes, wherein the discharging end of the plate cooling conveying line (2) is connected with the first material covering machine through a conveying device;

the first material covering machine (4) comprises a material covering rack (41), a material covering roller set (42) arranged at the feeding end of the material covering rack (41), a turnover mechanism (43) arranged on the material covering rack (41) and used for overturning the PET plate paved with the reinforced fabric, and a fabric cutting mechanism (44) used for cutting the folded reinforced fabric; a pushing mechanism (45) for pushing the turned PET plate forward is also arranged;

the material covering roller set (42) comprises a material covering lower supporting roller (421) and a material covering upper pressing roller (422) which are matched with each other to realize feeding, a gap for a PET plate to pass through is arranged between the material covering lower supporting roller (421) and the material covering upper pressing roller (422), and the material covering roller set also comprises a material storage roller (423) arranged above the material covering upper pressing roller (422); the turnover mechanism (43) comprises rotating discs (431) arranged on two sides of the material covering rack (41), one ends of swing arms (432) are fixed on the rotating discs (431), and the other ends of the two swing arms (432) are connected with a turnover deflector rod (434); the fabric cutting mechanism (44) comprises a cutting cutter (441) arranged on the material covering rack (41) and a cutter driving device (442) for driving the cutting cutter (441) to move back and forth; the pushing mechanism (45) comprises a pushing plate (451) acting on one end of the turned PET plate and a pushing cylinder (452) driving the pushing plate (451) to move back and forth.

6. The production line for producing a high-strength PET core material according to claim 5, wherein: the cutting mechanism (3) comprises a movable frame (31) which is arranged on the plate cooling conveying line (2) and synchronously moves along with the plate, a first screw rod module (32) is transversely arranged on the movable frame (31), a cutting motor (33) is fixedly arranged on a movable sliding block of the first screw rod module (32), and a cutting blade (34) is connected with an output end of the cutting motor (33); the movable frame (31) is also provided with a front clamping roller set (35) and a rear clamping roller set (36) for clamping the plate.

7. The production line for producing a high-strength PET core material according to claim 5, wherein: the cutting machine (6) is also provided with a puncher (7) for punching the sheet, and a second material covering machine (8) with the same structure as the first material covering machine (4) is arranged behind the puncher (7);

the punching machine (7) comprises a punching frame (71), a conveying chain (72) arranged on the punching frame (71), a group of conveying guide wheels (721) are arranged on the conveying chain (72), a group of punching support bars (73) for supporting plates are arranged on the punching frame (71), a group of punching press plates (74) matched with the punching support bars (73) and used for clamping and fixing the plates are also arranged on the punching frame (71), and lifting cylinders (741) for controlling the punching press plates (74) to move up and down are arranged on the punching frame (71);

the punching machine is characterized in that a second screw rod module (75) fixed on the punching frame (71) is vertically arranged above the punching support bar (73), a punching fixing seat (76) is fixedly arranged on a movable sliding block of the second screw rod module (75), at least one row of punching devices are arranged below the punching fixing seat (76), and each punching device comprises a punching motor (77) and a punching drill bit (771) arranged on the punching motor (77).

8. The production line for producing a high-strength PET core material according to claim 7, wherein: the punching machine frame (71) is located one end of the punching press plate (74) and is further provided with a limiting pushing mechanism for driving the plate to move forwards, the limiting pushing mechanism comprises two third screw rod modules (78) which are arranged side by side, a clamping cylinder (79) which moves back and forth along with the sliding block is fixedly arranged on the sliding block of the third screw rod modules (78), a lower clamping block (791) is fixedly arranged on a cylinder seat of the clamping cylinder (79), and an upper clamping block (792) which is matched with the lower clamping block (791) to clamp the sheet is fixedly arranged at the piston end of the clamping cylinder (79).

9. The production line for producing a high-strength PET core material according to claim 5, wherein: the plate cooling conveying line (2) is provided with a trimming mechanism (9) positioned in front of the cutting mechanism (3), the trimming mechanism (9) comprises trimming seats (91) symmetrically arranged on two sides of the plate cooling conveying line (2), and the trimming seats (91) are vertically provided with trimming milling cutters (92); the trimming seat (91) is further provided with a limiting device for preventing the sheet from jumping up and down, the limiting device comprises a lower limiting support block (93), an upper limiting support block (94) which is arranged corresponding to the lower limiting support block (93), and a group of guide wheels (95) are arranged on the lower limiting support block (93) and the upper limiting support block (94).