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

Abstract

The application discloses a preparation method of high-strength PET core material and a production line thereof, and the preparation method comprises the steps of extruding a plate material into a shape, trimming, cutting, sanding, coating, heat sealing, slitting, punching and bottom film coating. The production line comprises an extrusion forming die, a plate material cooling conveying line, a trimming mechanism, a cutting mechanism, a sander, a first coating machine, a heat sealing device, a slitting machine, a puncher and a second coating machine which are sequentially arranged. Through the preparation method and the production line, the obtained PET core material has high strength, the glue filling amount is reduced, and the weight of the PET core material can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the field of PET plate processing, in particular to a high-strength PET core material preparation method and a production line thereof. BACKGROUND

[0002] PET plates are currently widely used as inner lining core materials on wind blades due to their light weight, and the PET plates are usually compounded with epoxy resin and other materials. In order to improve the strength of the PET plate, glue holes are usually arranged on the PET plate, and the epoxy resin enters the glue holes to improve the strength of the PET plate. However, the increase in the number of glue holes will increase the weight, so it is necessary to seek a balance between strength and weight to meet the requirements of the core material of the wind blade. With the continuous lengthening of the design of the wind blade, it is required that the PET core material can improve the strength while ensuring a relatively light weight, so as to meet the installation requirements of the wind blade. Therefore, it is necessary to improve the processing method and processing equipment of the PET core material to obtain a PET core material with high strength and light weight. SUMMARY

[0003] The application aims to provide a high-strength PET core material preparation method and a production line thereof, and solve the problems of low strength and heavy weight of the existing PET core material.

[0004] The technical scheme adopted by the application to solve the technical problems is as follows: a high-strength PET core material preparation method and a production line thereof, the high-strength PET core material preparation method comprising the following steps:

[0005] S1: extruding plate forming, forming a PET plate through an extrusion forming die and cooling;

[0006] S2: cutting, cutting the PET plate according to the required length specification;

[0007] S3: covering, laying a layer of reinforcing fabric on one side of the PET plate;

[0008] S4: heat sealing, heat sealing and stacking a plurality of PET plates together in the same direction through a heat sealing device to form a PET cubic block, wherein the side of the adjacent two PET plates on which the reinforcing fabric is laid is heat sealed with the side of another PET plate on which no reinforcing fabric is laid;

[0009] S5: slitting, slitting along a vertical plane perpendicular to the extrusion direction to form a PET core material with a required thickness.

[0010] The step S5 is further provided with the following step:

[0011] S6: punching, punching along the extrusion direction to form a group of through holes penetrating the upper and lower surfaces of the PET core material;

[0012] S7: bottom film coating, laying a layer of fabric on one side of the PET core material as the bottom fabric.

[0013] The step S2 before cutting is also provided with an edge trimming process for treating both sides of the PET plate to make them flat.

[0014] The step S3 before coating is also provided with a sanding process for treating the upper and lower surfaces of the PET plate to make them flat.

[0015] The production line of the high-strength PET core material includes an extrusion molding die for extruding the PET plate, a plate cooling conveying line connected to the extrusion molding die, a cutting mechanism arranged on the plate cooling conveying line, and a first coating machine arranged on the discharge end of the plate cooling conveying line for laying a reinforcing fabric on one side of the PET plate, a heat sealing device for heat sealing multiple PET plates to form a PET cubic block, and a slitting machine for slitting the PET cubic block.

[0016] In order to realize the continuity of coating and improve the coating efficiency, the first coating machine includes a coating rack, a coating roller group arranged at the feeding end of the coating rack, a folding mechanism arranged on the coating rack for turning over the PET plate laid with the reinforcing fabric, and a fabric cutting mechanism for cutting the reinforcing fabric after folding; a pushing mechanism is further arranged to push the turned over PET plate forward.

[0017] Further, the coating roller group includes a lower coating support roller and an upper coating pressure roller cooperating with each other to realize feeding, a gap is arranged between the lower coating support roller and the upper coating pressure roller for the PET plate to pass through, and a storage roller is arranged above the upper coating pressure roller; the folding mechanism includes rotating discs arranged on both sides of the coating rack, swing arms fixed at one end of the rotating discs, and turning rods connected at the other end of the two swing arms; the fabric cutting mechanism includes a cutting knife arranged on the coating rack and a cutting knife driving device for driving the cutting knife to move back and forth; the pushing mechanism includes a push plate acting on one end of the turned over PET plate and a pushing cylinder for driving the push plate to move back and forth.

[0018] In order to realize feeding and cutting at the same time, the cutting mechanism includes a movable frame arranged on the plate cooling conveying line to move synchronously with the plate, a first lead screw module is arranged transversely on the movable frame, a cutting motor is fixedly arranged on the movable slide block of the first lead screw module, and a cutting blade is connected to the output end of the cutting motor; the movable frame is also provided with a front clamping roller group and a rear clamping roller group for clamping the plate.

[0019] In order to improve the strength of the PET core material and reduce the mass of the PET core material, a punching machine is further arranged after the slitting machine for punching the sheet material, and a second coating machine with the same structure as the first coating machine is arranged after the punching machine.

[0020] Further, the puncher comprises a puncher frame, a conveying chain arranged on the puncher frame, a group of conveying guide wheels arranged on the conveying chain, a group of punch supporting strips arranged on the puncher frame for supporting the plate, a group of punch pressure plates arranged on the puncher frame and matched with the punch supporting strips for clamping and fixing the plate, and a lifting cylinder arranged on the puncher frame and used for controlling the up-down movement of the punch pressure plates.

[0021] Further, a second lead screw module is arranged vertically above the punch supporting strips and fixed on the puncher frame, a punch fixing seat is fixed on the movable sliding block of the second lead screw module, at least one row of punch devices is arranged below the punch fixing seat, and the punch device comprises a punch motor and a punch drill arranged on the punch motor.

[0022] In order to ensure the accuracy of the punching and improve the punching density, a limiting advancing mechanism for driving the plate to move forward is arranged at one end of the puncher frame of the step-by-step puncher, the limiting advancing mechanism comprises two third lead screw modules arranged side by side, a clamping cylinder fixedly installed on the sliding block of the third lead screw module and moving back and forth with the sliding block, a lower clamping block fixedly arranged on the cylinder seat of the clamping cylinder, and an upper clamping block fixedly arranged on the piston end of the clamping cylinder and matched with the lower clamping block to clamp the plate.

[0023] In order to make the two side surfaces of the PET plate flat, an edge trimming mechanism is arranged on the plate cooling conveying line before the cutting mechanism, the edge trimming mechanism comprises edge trimming seats arranged symmetrically on both sides of the plate cooling conveying line, and edge trimming milling cutters are arranged vertically on the edge trimming seats; a limiting device for preventing the plate from jumping up and down is further arranged on the edge trimming seat, the limiting device comprises a lower limiting support block, an upper limiting support block arranged correspondingly with the lower limiting support block, and a group of guide wheels arranged on the lower limiting support block and the upper limiting support block.

[0024] The beneficial effects of the present application: by the method of the present application, the PET plates are stacked and the reinforcing fabric is added between the PET plates, and then the PET plates are hot-pressed and combined together to form a PET cubic block, and then the PET cubic block is cut along the direction perpendicular to the extrusion direction of the PET plate to form a PET core material, under the restraint of the reinforcing fabric, the structure can greatly improve the compression, tensile strength and shear strength of the PET core material, and since the reinforcing fabric is light in weight, it will not increase the weight of the PET core material, but can reduce the number of holes, that is, reduce the amount of epoxy resin poured, thereby achieving the effect of weight reduction. The bottom fabric can not only enhance the tensile strength of the PET core material, but also overcome the problem of PET core material being broken under pressure during transportation, so that even if the PET core material is broken, the bottom fabric can connect the PET core material together, which will not affect the subsequent installation and use. The glue hole can inject epoxy resin to further increase the strength of the PET core material when the PET core material is combined with other materials. In addition, the first coating machine and the second coating machine can realize continuous coating, automatic cutting, and improve the efficiency of coating; the cutting mechanism can realize continuous production by cutting the extruded PET plate while conveying, thereby improving the production efficiency; the drilling method is adopted in the punching step, the inner wall of the drilled hole is smooth and smooth, and the mouth part will not be broken; the trimming mechanism can trim the side edges of the PET plate to ensure that the PET plates can be stacked neatly during heat sealing, so that the side surface of the PET cubic block formed by heat sealing remains flat.

[0025] The present application will be described in more detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The step block diagram of the method of the present application.

[0027] Figure 2 The schematic diagram of the production line of the present application.

[0028] Figure 3 The perspective view of the cutting mechanism and the trimming mechanism in the present application.

[0029] Figure 4 The front view of the cutting mechanism and the trimming mechanism in the present application.

[0030] Figure 5 The perspective view of the first coating machine in the present application.

[0031] Figure 6 The front view of the first coating machine in the present application.

[0032] Figure 7 The material belt diagram of the coating step in the present application.

[0033] Figure 8Fig. 4 is a perspective view of the puncher in the present application.

[0034] Figure 9 Fig. 5 is a front view of the puncher in the present application.

[0035] Figure 10 Fig. 6 is a schematic view of the position of the limiting advancing mechanism of the puncher in the present application.

[0036] Figure 11 Fig. 7 is a schematic view of the PET cubic block in the present application. Figure 10 Fig. 8 is an enlarged view of the local A.

[0037] Figure 12 Fig. 9 is a schematic view of the cutting direction of the PET cubic block in the present application.

[0038] Figure 13 Fig. 10 is a perspective view of the PET core material obtained in the present application. DETAILED DESCRIPTION

[0039] The present application provides a method for preparing a high-strength PET core material, which is characterized by comprising the following steps: Figures 1 to 13

[0040] S1: extruding plate forming, forming PET plate through an extrusion forming die and cooling;

[0041] S2: cutting, cutting the PET plate according to the required length specification;

[0042] S3: covering, laying a layer of reinforcing fabric on one side of the PET plate;

[0043] S4: heat sealing, stacking a plurality of PET plates together in the same direction through a heat sealing device to form a PET cubic block, wherein the side of the adjacent two PET plates on which the reinforcing fabric is laid is heat sealed with the side of another PET plate on which no reinforcing fabric is laid;

[0044] S5: cutting, cutting along a vertical plane perpendicular to the extrusion direction to form a PET core material with a required thickness.

[0045] The step S5 is further provided with the following steps:

[0046] S6: punching, punching along the extrusion direction to form a group of through holes penetrating the upper and lower surfaces of the PET core material;

[0047] S7: bottom film covering, laying a layer of fabric on one side of the PET core material as a bottom fabric.

[0048] The step S2 is further provided with an edge trimming process before cutting, which processes the two sides of the PET plate to be flat.

[0049] ​The step S3 before coating is also provided with a sanding process for treating the upper and lower surfaces of the PET plate to make them flat.

[0050] To ensure the implementation of the above method, the following specific equipment is combined to specifically describe the method:

[0051] A high-strength PET core material production line, comprising an extrusion molding PET plate extrusion molding die 1, a plate cooling conveying line 2 connected to the extrusion molding die 1, a cutting mechanism 3 and an edge trimming mechanism 9 provided on the plate cooling conveying line 2, and a sanding machine 10, a first coating machine 4, a heat sealing device 5, a slitting machine 6, a punching machine 7 and a second coating machine 8 connected in sequence through conveying devices at the discharge end of the plate cooling conveying line 2.

[0052] First, the extrusion molding die 1 is used to extrude a long PET plate, which is then conveyed to the edge trimming mechanism through the plate cooling conveying line 2 for trimming, flattening the two sides of the PET plate, and further flattening the sides of the PET cubic block formed by heat sealing. The edge trimming mechanism 9 includes edge trimming seats 91 symmetrically arranged on both sides of the plate cooling conveying line 2, and edge trimming milling cutters 92 vertically arranged on the edge trimming seats 91 and driven by drive motors. The edge trimming seats 91 are also provided with limiting devices to prevent the sheet from jumping up and down, which include lower limiting support blocks 93, upper limiting support blocks 94 corresponding to the lower limiting support blocks 93, and a set of guide wheels 95 arranged on the lower limiting support blocks 93 and the upper limiting support blocks 94. The gap between the two sets of guide wheels 95 is adapted to the thickness of the PET plate.

[0053] To ensure that the PET plate extruded by the extrusion molding die 1 can be continuously conveyed forward, the feeding end of the edge trimming mechanism 9 is provided with a conveying traction device 11, which includes upper traction rollers 111 and lower traction rollers 112 arranged on the plate cooling conveying line 2. The gap between the upper traction rollers 111 and the lower traction rollers 112 is smaller than the thickness of the PET plate, and the upper traction rollers 111 and the lower traction rollers 112 rotate synchronously towards the conveying direction of the plate cooling conveying line 2. Since the extrusion force of the extrusion molding die 1 alone cannot push the extruded long PET plate to continuously convey forward, the upper traction rollers 111 and the lower traction rollers 112 are needed to cooperate with each other to drive the PET plate to stably convey forward.

[0054] The cutting mechanism 3 includes a movable frame 31 arranged on the plate cooling conveying line 2 and moving synchronously with the plate, and the movable frame 31 is driven by a fourth screw rod module 37 arranged on both sides of the plate cooling conveying line 2. A first screw rod module 32 is arranged transversely on the movable frame 31, a cutting motor 33 is fixedly arranged on the movable slide block of the first screw rod module 32, a cutting blade 34 is connected to the output end of the cutting motor 33, and the cutting blade 34 is driven by the first screw rod module 32 to move transversely to cut the PET plate. In order to prevent the PET plate from jumping up and down when cutting, a front clamping roller set 35 and a rear clamping roller set 36 for clamping the plate are further arranged on the movable frame 31. The front clamping roller set 35 includes an upper clamping roller 351 and a lower clamping roller 352, and the 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. The rear clamping roller set 36 has the same structure as the front clamping roller set 35.

[0055] In order to prevent bubbles from being generated between the PET plates during heat sealing, causing the heat sealing to be not firm, the upper and lower surfaces of the PET plate are treated by the sanding machine 10 after cutting to make them flat. The specific structure of the sanding machine 10 can refer to the invention patent with the patent number 2016103678472 and the patent name "sanding machine".

[0056] Before heat sealing, a reinforcing fabric is laid on one side of the PET plate by the first coating machine 4 to improve the compression, tensile and shear strength of the PET core material, and also to reduce the amount of glue filling, achieving the effect of weight reduction. The first coating machine 4 includes a coating rack 41, a coating roller set 42 arranged at the feeding end of the coating rack 41, the coating roller set 42 includes a coating lower support roller 421 and a coating upper pressure roller 422 which cooperate to achieve feeding, the coating lower support roller 421 and the coating upper pressure roller 422 are both driven rollers, a gap for the PET plate to pass through is arranged between the coating lower support roller 421 and the coating upper pressure roller 422, and a storage roller 423 is arranged above the coating upper pressure roller 422. The reinforcing fabric with glue is adhered to the upper surface of the PET plate by the coating lower support roller 421 and the coating upper pressure roller 422 and is conveyed forward, as shown in the figure, the reinforcing fabric is continuous and uninterrupted, and a plurality of PET plates are adhered to the reinforcing fabric, the reinforcing fabric needs to be cut from between the adjacent two PET plates by the folding mechanism 43 and the cutting mechanism 44. Figure 7

[0057] The folding mechanism 43 includes a rotating disc 431 arranged on both sides of the coating rack 41 and driven by a driving motor, a swing arm 432 fixed at one end of the rotating disc 431, and a turnover lever 434 connected at the other end of the two swing arms 432. Figure 7 ​As shown, the PET plate material at the front end is flipped up by 180 degrees by the driving device and the turnover rod 434, and is pressed against the cutting knife 441 of the fabric cutting mechanism 44. The fabric cutting mechanism 44 includes the cutting knife 441 arranged on the fabric rack 41 and the cutting knife driving device 442 for driving the cutting knife 441 to move back and forth, which is a lead screw module arranged on both sides of the fabric rack 41. The cutting knife driving device 442 drives the cutting knife 441 to move in the conveying direction to cut the reinforcing fabric. Then, the PET plate material above is pushed down by the pushing mechanism 45 to realize material return. The pushing mechanism 45 includes the push plate 451 acting on one end of the flipped PET plate material and the pushing cylinder 452 for driving the push plate 451 to move back and forth.

[0058] After the reinforcing fabric is laid on one side of the PET plate material, the PET plate materials are heat sealed by the heat sealing device 5 to form PET cubic blocks, and each two layers of PET plate materials have a layer of reinforcing fabric therebetween. The specific structure of the heat sealing device 5 can refer to the utility model patent with the patent number 2020216489729 and the patent name "a hot melt compound machine".

[0059] After the PET cubic blocks are formed by heat sealing, the PET core material is cut into a sheet shape according to the required thickness by the slitting machine 9. As shown, the slitting is performed along the direction perpendicular to the extrusion direction of the PET plate material. Figure 12

[0060] ​In order to further ensure the strength of the PET core material, a group of through holes penetrating the upper and lower surfaces of the PET core material are needed to be processed on the PET core material for filling epoxy resin. The punching machine 7 comprises a punching machine frame 71, a conveying chain 72 arranged on the punching machine frame 71, a group of conveying guide wheels 721 arranged on the conveying chain 72, and the PET core material is placed on the conveying guide wheels 721, and the conveying guide wheels 721 are driven by the conveying chain 72 to drive the PET core material to be conveyed to the punching support strip 73. A group of punching support strips 73 for supporting the plate are arranged on the punching machine frame 71, and a group of punching pressure plates 74 for clamping and fixing the plate are arranged on the punching machine frame 71 in cooperation with the punching support strips 73. The punching machine frame 71 is provided with a lifting cylinder 741 for controlling the up and down movement of the punching pressure plate 74. The punching pressure plate 74 is driven downward by the lifting cylinder 741 to firmly fix the PET core material to be punched on the punching support strip 73 for punching. A second lead screw module 75 is vertically arranged above the punching support strip 73 and fixed on the punching machine frame 71, a punching fixing seat 76 is fixedly arranged on the movable sliding block of the second lead screw module 75, at least one row of punching devices are arranged below the punching fixing seat 76, and the punching devices comprise a punching motor 77 and a punching drill bit 771 arranged on the punching motor 77. The punching fixing seat 76 is driven downward by the second lead screw module 75, and the punching drill bit 771 is driven downward to drill a through hole in the PET core material. Compared with the traditional way of punching holes by using a thimble, the way of drilling holes can effectively avoid the deformation of the hole flange and ensure the smoothness of the inner wall of the hole.

[0061] Due to the volume limitation of the punching motor 77 itself, a large number of punching motors 77 cannot be installed on the punching fixing seat 76, which leads to the fact that all through holes cannot be drilled on the PET core material at one time, and therefore a step-by-step punching method is needed. A limiting advancing mechanism for driving the plate to move forward is arranged at one end of the punching pressure plate 74 of the punching machine frame 71, the limiting advancing mechanism comprises two third lead screw modules 78 arranged side by side, a clamping cylinder 79 fixedly installed on the sliding block of the third lead screw module 78 and moving back and forth with the sliding block, a lower clamping block 791 is fixedly arranged on the cylinder seat of the clamping cylinder 79, and an upper clamping block 792 is fixedly arranged on the piston end of the clamping cylinder 79 and cooperates with the lower clamping block 791 to realize clamping of the sheet. The PET core material is clamped firmly by the upper clamping block 792 and the lower clamping block 791, after punching a hole, the PET core material is conveyed forward by one step by the limiting advancing mechanism for the second time, and the process is repeated according to the required hole density. At the same time, the PET core material can also be fed and limited by the telescopic part 793 of the clamping cylinder 79 to ensure the feeding accuracy.

[0062] A second coating machine 8 is provided after the punching machine 7. The structure of the second coating machine 8 is the same as that of the first coating machine 4. The second coating machine 8 lays a layer of fabric on one side of the PET core material as a bottom fabric, which further improves the strength of the PET core material.

[0063] The PET core material obtained by this invention has the following structure: Figure 13 As shown, the PET core material comprises multiple layers of extruded sheets 100 stacked together, with a reinforcing fabric 200 sandwiched between two layers of extruded sheets 100, and is fixed together by hot-pressing. During hot-pressing, a hot-pressed weld 500 is formed between the two layers of extruded sheets 100. For ease of subsequent description of the performance of the PET core material in various directions, the direction perpendicular to the hot-pressed weld is defined as the X-direction of the PET core material, the direction parallel to the weld is defined as the Y-direction, and the extrusion direction of the extruded sheets 100 is defined as the Z-direction. The reinforcing fabric 200 can be one or more of fiberglass cloth, carbon fiber cloth, mesh cloth, and polyester cloth arranged in a cross pattern, preferably biaxial or triaxial fiberglass cloth. To prevent the grooved PET core material from being damaged by pressure during transportation, a bottom fabric 300 is provided on the bottom surface of the PET core material. The bottom fabric 300 can be made of the same material as the reinforcing fabric 200, or it can be made of ordinary nylon fabric. At the same time, adding 300 to the bottom fabric can also enhance the tensile and compressive strength of the PET core material in the X and Y directions.

[0064] The table below shows the performance tests of PET core material as wind turbine blade shell and web, with and without reinforcing fabric. The reinforcing fabric is a composite mesh fabric. In the table, 1 after tensile strength and compressive strength represents the X direction, 2 represents the Y direction, and 3 represents the Z direction. 12 after shear strength and shear modulus represents the XY direction, 13 represents the XZ direction, and 23 represents the YZ direction.

[0065]

[0066] The table shows that with the added restraint of the mesh fabric, the PET core material can be greatly improved in terms of compressive strength, tensile strength and shear strength.

[0067] The PET core material is also provided with a set of adhesive holes 400. The adhesive holes 400 are through holes. When combined with other materials using epoxy resin, the epoxy resin flows into the adhesive holes 400 to form a set of reinforcing adhesive columns, thereby further improving the compressive and tensile strength of the PET core material.

[0068] The application is described above with reference to the drawings. It is obvious that the specific implementation of the application is not limited to the above-mentioned manner. As long as various non-essential improvements are made by using the method concept and technical solutions of the application, or the above-mentioned concept and technical solutions of the application are directly applied to other occasions without improvement, they are all within the protection scope of the application.

Claims

1. A production line for the preparation of high-strength PET core material, characterized by: The extrusion molding die (1) of the extrusion molding PET plate, the plate cooling conveying line (2) of the extrusion molding die (1) is connected, the cutting mechanism (3) is arranged on the plate cooling conveying line (2), the discharge end of the plate cooling conveying line (2) is sequentially connected with the first material laying machine (4) for laying the reinforcing material on one side of the PET plate, the heat sealing equipment (5) for heat sealing the PET plate to form the PET cubic block and the slitting machine (6) for slitting the PET cubic block through the conveying device; The first material laying machine (4) comprises a material laying rack (41), a material laying roller group (42) arranged at the feeding end of the material laying rack (41), a folding mechanism (43) arranged on the material laying rack (41) for turning over the PET plate laid with the reinforcing material and a material cutting mechanism (44) for cutting the reinforcing material after being turned over, and a material pushing mechanism (45) for pushing the turned over PET plate forward is further arranged; The material laying roller group (42) comprises a material laying lower supporting roller (421) and a material laying upper pressing roller (422) cooperating with each other to realize feeding, a gap for the PET plate to pass through is arranged between the material laying lower supporting roller (421) and the material laying upper pressing roller (422), and a material storage roller (423) is arranged above the material laying upper pressing roller (422); the folding mechanism (43) comprises rotating discs (431) arranged on both sides of the material laying rack (41), swing arms (432) fixed at one end of the rotating discs (431), and turning over push rods (434) connected at the other end of the two swing arms (432); the material cutting mechanism (44) comprises a cutting cutter (441) erected on the material laying rack (41) and a cutter driving device (442) for driving the cutting cutter (441) to move back and forth; the material pushing mechanism (45) comprises a push plate (451) acting on one end of the turned over PET plate and a material pushing cylinder (452) for driving the push plate (451) to move back and forth.

2. The production line for the high-strength PET core material according to claim 1, characterized by: The cutting mechanism (3) comprises a movable frame (31) arranged on the plate cooling conveying line (2) and moving synchronously with the plate, a first lead screw module (32) is arranged transversely on the movable frame (31), a cutting motor (33) is fixedly arranged on the movable slide block of the first lead screw module (32), and a cutting blade (34) is connected to the output end of the cutting motor (33); a front clamping roller group (35) and a rear clamping roller group (36) for clamping the plate are further arranged on the movable frame (31).

3. The production line for the high-strength PET core material according to claim 1, characterized by: The slitting machine (6) is further provided with a punching machine (7) for punching the sheet material, and the punching machine (7) is provided with a second material laying machine (8) which has the same structure as the first material laying machine (4) after the punching machine (7). The punching machine (7) comprises a punching machine frame (71), a conveying chain (72) arranged on the punching machine frame (71), a group of conveying guide wheels (721) arranged on the conveying chain (72), a group of punching support strips (73) for supporting the plate arranged on the punching machine frame (71), and a group of punching pressure plates (74) arranged on the punching machine frame (71) and matched with the punching support strips (73) for clamping and fixing the plate, wherein the punching machine frame (71) is provided with a lifting cylinder (741) for controlling the up-down movement of the punching pressure plate (74). A second lead screw module (75) is vertically arranged above the punching support strip (73) and fixed on the punching machine frame (71), a punching fixing seat (76) is fixedly arranged on the movable sliding block of the second lead screw module (75), and at least one row of punching devices is arranged below the punching fixing seat (76), wherein the punching device comprises a punching motor (77) and a punching drill bit (771) arranged on the punching motor (77).

4. The production line for the high-strength PET core material according to claim 3, characterized by: The punching machine frame (71) is provided with a limiting advancing mechanism for driving the plate to move forward at one end of the punching pressure plate (74), the limiting advancing mechanism comprises two third lead screw modules (78) arranged side by side, a clamping cylinder (79) fixedly installed on the sliding block of the third lead screw module (78) and moving back and forth with the sliding block, a lower clamping block (791) fixedly arranged on the cylinder seat of the clamping cylinder (79), and an upper clamping block (792) fixedly arranged at the piston end of the clamping cylinder (79) and matched with the lower clamping block (791) to realize clamping of the plate.

5. The production line for the high-strength PET core material according to claim 1, characterized by: The plate cooling conveying line (2) is provided with an edge trimming mechanism (9) before the cutting mechanism (3), the edge trimming mechanism (9) comprises edge trimming seats (91) symmetrically arranged on both sides of the plate cooling conveying line (2), and an edge trimming milling cutter (92) is vertically arranged on the edge trimming seat (91); the edge trimming seat (91) is further provided with a limiting device for preventing the plate from jumping up and down, the limiting device comprises a lower limiting support block (93), an upper limiting support block (94) correspondingly arranged with the lower limiting support block (93), and a group of guide wheels (95) arranged on the lower limiting support block (93) and the upper limiting support block (94).

6. The method of producing a high-strength PET core material using the production line according to any one of claims 1 to 5, characterized by, The method comprises the following steps: S1: extruding plate forming, forming PET plate by an extrusion forming die and cooling; S2: cutting, cutting the PET plate according to the required length specification; S3: covering, laying a layer of reinforcing fabric on one side of the PET plate; before laying the reinforcing fabric, a sanding process for treating the upper and lower surfaces of the PET plate to make them flat is further arranged; S4: heat sealing, stacking a plurality of PET plates together in the same direction by a heat sealing device to form a PET cubic block, wherein the side of one of the two adjacent PET plates on which the reinforcing fabric is laid is heat sealed with the side of the other PET plate on which no reinforcing fabric is laid; S5: slitting, slitting along a vertical plane perpendicular to the extrusion direction to form a PET core material with a required thickness; S6: punching, punching along the extrusion direction by a punching device to form a group of through holes penetrating through the upper and lower surfaces of the PET core material; The punching device comprises a punching motor and a punching drill head arranged on the punching motor. S7: bottom film coating, a layer of fabric is laid on one side of the PET core material as the bottom fabric.

7. The method for preparing high-strength PET core material as described in claim 6, characterized in that: The step S2 is further provided with an edge trimming process for treating the two sides of the PET plate to be flat before cutting.

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