Multi-layer co-extrusion plate production line

Abstract

The utility model discloses a multi-layer co-extrusion plate production line which comprises an extruder, a co-extruder, a co-extrusion die, a three-roller calender, a cooling bracket, a first traction machine, a second traction machine, an upper film supply mechanism, a lower film supply mechanism and a film pressing mechanism, a discharge port of the extruder and a discharge port of the co-extruder are respectively connected with the co-extrusion die, and the extruder and the co-extruder are respectively used for extruding materials into the co-extrusion die and extruding the materials through the co-extrusion die to obtain a plate; the plate sequentially penetrates through the three-roller calender, the first traction machine, the cooling bracket and the second traction machine, the three-roller calender is located behind the co-extrusion die and used for carrying out calendering forming on the plate, and the first traction machine is located behind the three-roller calender and used for pulling the plate to move backwards. According to the utility model, plates can be produced, protective films are pasted on the surfaces of the plates, and the plates can be prevented from being scrapped due to accidental scratches.

Description

Technical Field

[0001] The utility model relates to a multi-layer co-extrusion plate production line. Background Art

[0002] At present, extrusion production lines can be used to produce various plastic pipes, plastic plates, plastic sheets and other products, and are widely used. A Chinese patent with publication number CN214395304U discloses a high-efficiency and energy-saving PP sheet extrusion production line, which includes components such as extrusion, forming molds, three-roll calenders and traction machines, which can be used to produce sheet products. However, the high-efficiency and energy-saving PP sheet extrusion production line does not have a coating function, and a protective film cannot be attached to the surface of the produced sheet, which causes the sheet to be easily scratched during turnover and transportation, and then causes the sheet to be scrapped. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a multi-layer co-extrusion plate production line, which can produce plates and affix protective films on the surfaces of the plates to prevent the plates from being scrapped due to accidental scratches.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a multi-layer co-extrusion sheet production line, which includes an extruder, a co-extruder, a co-extrusion die, a three-roll calender, a cooling bracket, a first tractor, a second tractor, an upper film supply mechanism, a lower film supply mechanism and a film pressing mechanism;

[0005] The discharge port of the extruder and the discharge port of the co-extruder are respectively connected to the co-extrusion die, and the extruder and the co-extruder are respectively used to extrude the material into the co-extrusion die and extrude the material through the co-extrusion die to obtain a plate, and the plate passes through the three-roll calender, the first tractor, the cooling bracket and the second tractor in sequence;

[0006] The three-roll calender is located behind the co-extrusion die and is used to calender the sheet material;

[0007] The first traction machine is located behind the three-roll calender and is used to pull the plate to move backward;

[0008] The cooling bracket is located behind the first tractor and is used to hold the plate so that the plate can be cooled and shaped on the cooling bracket;

[0009] The second traction machine is located behind the cooling bracket and is used to pull the plate to move backward;

[0010] The upper film supply mechanism is located above the cooling bracket and is used to release the protective film. The protective film released from the upper film supply mechanism is located above the plate on the cooling bracket and extends into the film pressing mechanism.

[0011] The lower film supply mechanism is located below the cooling bracket and is used to release the protective film. The protective film released from the lower film supply mechanism is located below the plate on the cooling bracket and extends into the film pressing mechanism.

[0012] The film pressing mechanism is connected to the cooling bracket and is used to press the protective film released from the upper film supply mechanism onto the upper surface of the plate and to press the protective film released from the lower film supply mechanism onto the lower surface of the plate.

[0013] Furthermore, the multi-layer co-extruded sheet production line also includes a feeding system, which includes a drying tank, a dehumidifier, a first suction machine, a first negative pressure device, a first material container, a weighing batching machine, a second suction machine, a third suction machine, a second negative pressure device, a second material container, a fourth suction machine and a third negative pressure device;

[0014] The feed port of the extruder is connected with a feed hopper;

[0015] The first suction machine is connected to the upper end of the drying tank, the feeding port of the first suction machine is connected to the first material container, the discharging port of the first suction machine is connected to the drying tank, and the first negative pressure device is connected to the first suction machine and is used to create negative pressure in the first suction machine so that the first suction machine sucks the material in the first material container into the drying tank;

[0016] The dehumidifier is connected to the drying tank and is used to send dry air into the drying tank to dry the material in the drying tank;

[0017] The second suction machine is connected to the upper end of the weighing batching machine, the feeding port of the second suction machine is connected to the second material container, the discharging port of the second suction machine is connected to the weighing batching machine, and the second negative pressure device is connected to the second suction machine and is used to create negative pressure in the second suction machine so that the second suction machine can suck the material in the second material container into the weighing batching machine;

[0018] The third suction machine is connected to the upper end of the weighing batching machine, the feeding port of the third suction machine is connected to the drying tank, the discharging port of the third suction machine is connected to the weighing batching machine, and the second negative pressure device is also connected to the third suction machine and is used to create negative pressure in the third suction machine so that the third suction machine can suck the material in the drying tank into the weighing batching machine;

[0019] The fourth suction machine is connected to the upper end of the feed hopper, the feed port of the fourth suction machine is connected to the weighing batching machine, the discharge port of the fourth suction machine is connected to the feed hopper, and the third negative pressure device is connected to the fourth suction machine and is used to create negative pressure in the fourth suction machine so that the fourth suction machine can suck the mixed material in the weighing batching machine into the feed hopper.

[0020] Furthermore, the multi-layer co-extrusion sheet production line also includes a vacuum feeder;

[0021] The feed inlet of the co-extruder is connected with a feed hopper;

[0022] The vacuum loader is connected to the feeding hopper and is used to transport materials into the feeding hopper.

[0023] Further providing a specific structure of the film pressing mechanism, the upper film supply mechanism and the lower film supply mechanism, the film pressing mechanism comprises a fixing frame, a pressure seat, an upper pressure roller, a lower pressure roller and a pressing cylinder;

[0024] The upper film supply mechanism comprises an upper bracket, at least one upper unwinding roller and at least one upper guide roller;

[0025] The lower film supply mechanism comprises a lower support, at least one lower unwinding roller and at least one lower guide roller;

[0026] The fixing frame is connected to the cooling bracket;

[0027] The pressure seat is slidably connected to the fixing frame;

[0028] The upper pressing roller is rotatably connected to the pressing seat, the lower pressing roller is rotatably connected to the fixing frame, and the plate on the cooling bracket passes between the upper pressing roller and the lower pressing roller;

[0029] The upper unwinding roller and the upper guide roller are respectively connected to the upper bracket;

[0030] An upper film roll is mounted on the upper unwinding roller, and the protective film released from the upper film roll is wound around the upper guide roller and then extends between the upper pressing roller and the plate;

[0031] The lower unwinding roller and the lower guide roller are respectively connected to the lower bracket;

[0032] A lower film roll is installed on the lower unwinding roller, and the protective film released from the lower film roll is wound around the lower guide roller and then extends between the lower pressing roller and the plate;

[0033] The pressing cylinder is connected to the fixed frame, and the pressing cylinder is connected to the pressure seat and is used to drive the pressure seat to move downward, thereby driving the upper pressing roller to move toward the lower pressing roller so that the upper pressing roller presses the protective film on the upper surface of the plate and the lower pressing roller presses the protective film on the lower surface of the plate.

[0034] Furthermore, the multi-layer co-extruded sheet production line further comprises a heating mechanism located in front of the film pressing mechanism, the heating mechanism comprising a lifting cylinder, an upper ceramic heating plate and a lower ceramic heating plate;

[0035] The lower ceramic heating plate is connected to the cooling bracket and is located below the plate;

[0036] The upper ceramic heating plate is connected to the lifting cylinder and is located above the plate;

[0037] The lifting cylinder is connected to the upper bracket and is used to drive the upper ceramic heating plate to move up and down.

[0038] Furthermore, the multi-layer co-extruded sheet production line further comprises a cooling device located between the three-roll calender and the first traction machine, the cooling device comprising a mounting frame, a driving mechanism and a plurality of cooling rollers;

[0039] The cooling rollers are rotatably connected to the mounting frame, arranged in sequence along the extension direction of the plate and used to support the plate;

[0040] The driving mechanism is connected to the mounting frame, connected to the cooling roller and used for driving the cooling roller to rotate.

[0041] Further, the multi-layer co-extrusion sheet production line also includes a first screen changer, a second screen changer, a first metering pump, a second metering pump and a distributor;

[0042] The discharge port of the extruder is connected to the first screen changer, and the first screen changer is connected to the first metering pump;

[0043] The discharge port of the co-extruder is connected to the second screen changer, and the second screen changer is connected to the second metering pump;

[0044] The first metering pump and the second metering pump are respectively connected to the distributor, and the distributor is connected to the co-extrusion die.

[0045] Furthermore, the multi-layer co-extruded sheet production line further comprises a longitudinal saw and a transverse saw, and the sheet passes through the longitudinal saw and the transverse saw in sequence after passing through the second tractor;

[0046] The slitting saw is located behind the second tractor and is used to cut the board in the longitudinal direction to cut the board into a desired width;

[0047] The cross-cut saw is located behind the longitudinal saw and is used to cut the board in a transverse direction to cut the board into a desired length.

[0048] Furthermore, the multi-layer co-extrusion sheet production line also includes a conveyor and a hydraulic lifting platform;

[0049] The conveyor is located behind the cross-cut saw and is used to receive the plates cut by the cross-cut saw and convey the plates to the hydraulic lifting platform;

[0050] The hydraulic lifting platform is located behind the conveyor and is used to receive the plates delivered by the conveyor.

[0051] Furthermore, the multi-layer co-extruded sheet production line further comprises a waste film winding device located between the longitudinal saw and the transverse saw, wherein the waste film winding device comprises at least one upper winding mechanism located above the sheet and at least one lower winding mechanism located below the sheet;

[0052] The upper winding mechanism and the lower winding mechanism respectively include a winding frame, a winding drum and a winding motor;

[0053] The winding drum is rotatably connected to the winding frame;

[0054] The winding motor is connected to the winding frame and to the winding drum and is used for driving the winding drum to rotate.

[0055] After adopting the above technical solution, the extruder and the co-extruder extrude the material into the co-extrusion die respectively. After being extruded from the co-extrusion die, the material passes through the three-roll calender, the first tractor, the cooling bracket and the second tractor in sequence. The first tractor and the second tractor provide power for the movement of the material. The three-roll calender is used to calender the sheet material so that the sheet material reaches the required thickness and brightness. The sheet material can be naturally cooled and shaped on the cooling bracket. When the sheet material on the cooling bracket is cooled and shaped, the film pressing mechanism presses the protective film released from the upper film supply mechanism onto the upper surface of the sheet material and presses the protective film released from the lower film supply mechanism onto the lower surface of the sheet material, thereby affixing a protective film on the surface of the sheet material, which can prevent the sheet material from being scrapped due to accidental scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a structural schematic diagram of a multi-layer co-extrusion sheet production line of the utility model;

[0057] Figure 2 for Figure 1 Partial detail of section A;

[0058] Figure 3 for Figure 1 Partial detail of section B;

[0059] Figure 4 for Figure 1 Partial detail of middle section C;

[0060] Figure 5 for Figure 1 Partial detail of the middle section D;

[0061] Figure 6 for Figure 4 Partial detail of point E in the middle. DETAILED DESCRIPTION

[0062] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0063] like Figures 1 to 6 As shown, a multi-layer co-extrusion sheet production line includes an extruder 1, a co-extruder 2, a co-extrusion die 3, a three-roll calender 4, a cooling bracket 5, a first tractor 6, a second tractor 7, an upper film supply mechanism 8, a lower film supply mechanism 9 and a film pressing mechanism 10;

[0064] The discharge port of the extruder 1 and the discharge port of the co-extruder 2 are respectively connected to the co-extrusion die 3, and the extruder 1 and the co-extruder 2 are respectively used to extrude the material into the co-extrusion die 3 and extrude the material through the co-extrusion die 3 to obtain a plate, and the plate passes through the three-roll calender 4, the first tractor 6, the cooling bracket 5 and the second tractor 7 in sequence;

[0065] The three-roll calender 4 is located behind the co-extrusion die 3 and is used for calendering the sheet;

[0066] The first traction machine 6 is located behind the three-roll calender 4 and is used to pull the plate to move backward;

[0067] The cooling bracket 5 is located behind the first tractor 6 and is used to hold the plate so that the plate can be cooled and shaped on the cooling bracket 5;

[0068] The second traction machine 7 is located behind the cooling bracket 5 and is used to pull the plate to move backward;

[0069] The upper film supply mechanism 8 is located above the cooling bracket 5 and is used to release the protective film 11. The protective film 11 released from the upper film supply mechanism 8 is located above the plate on the cooling bracket 5 and extends into the film pressing mechanism 10.

[0070] The lower film supply mechanism 9 is located below the cooling bracket 5 and is used to release the protective film 11. The protective film 11 released from the lower film supply mechanism 9 is located below the plate on the cooling bracket 5 and extends into the film pressing mechanism 10.

[0071] The film pressing mechanism 10 is connected to the cooling bracket 5 and is used to press the protective film 11 released from the upper film supply mechanism 8 onto the upper surface of the plate and to press the protective film 11 released from the lower film supply mechanism 9 onto the lower surface of the plate; specifically, the extruder 1 and the co-extruder 2 respectively extrude the material into the co-extrusion die 3, and the material is sequentially passed through the three-roll calender 4, the first tractor 6, the cooling bracket 5 and the second tractor 7 after being extruded from the co-extrusion die 3. The first tractor 6 and the second tractor 7 provide power for the movement of the material, and the three-roll calender 4 is used to calender the plate so that the plate reaches the required thickness and brightness, and the plate can be naturally cooled and shaped on the cooling bracket 5. When the sheet on the cooling bracket 5 is cooled and shaped, the film pressing mechanism 10 presses the protective film 11 released by the upper film supply mechanism 8 onto the upper surface of the sheet and presses the protective film 11 released by the lower film supply mechanism 9 onto the lower surface of the sheet, thereby affixing the protective film 11 onto the surface of the sheet, which can prevent the sheet from being scrapped due to accidental scratches. In this embodiment, the sheet is a multi-layer co-extruded sheet.

[0072] like Figure 1 , 2 As shown, the multi-layer co-extrusion sheet production line may further include a feeding system, which may include a drying tank 12, a dehumidifier 13, a first suction machine 14, a first negative pressure device 15, a first material container 16, a weighing batching machine 17, a second suction machine 18, a third suction machine 19, a second negative pressure device 20, a second material container 21, a fourth suction machine 22 and a third negative pressure device 23;

[0073] The feed port of the extruder 1 is connected to a feed hopper 24;

[0074] The first suction machine 14 is connected to the upper end of the drying tank 12, the feeding port of the first suction machine 14 is connected to the first material container 16, the discharging port of the first suction machine 14 is connected to the drying tank 12, and the first negative pressure device 15 is connected to the first suction machine 14 and is used to create negative pressure in the first suction machine 14 so that the first suction machine 14 sucks the material in the first material container 16 into the drying tank 12;

[0075] The dehumidifier 13 is connected to the drying tank 12 and is used to send dry air into the drying tank 12 to dry the material in the drying tank 12; specifically, the dehumidifier 13 is used to send dry hot air into the drying tank 12, and the hot air circulates between the drying tank 12 and the dehumidifier 13 to remove moisture from the material in the drying tank 12;

[0076] The second suction machine 18 is connected to the upper end of the weighing batching machine 17, the feeding port of the second suction machine 18 is connected to the second material container 21, the discharging port of the second suction machine 18 is connected to the weighing batching machine 17, and the second negative pressure device 20 is connected to the second suction machine 18 and is used to create negative pressure in the second suction machine 18 so that the second suction machine 18 sucks the material in the second material container 21 into the weighing batching machine 17;

[0077] The third suction machine 19 is connected to the upper end of the weighing batching machine 17, the feeding port of the third suction machine 19 is connected to the drying tank 12, the discharging port of the third suction machine 19 is connected to the weighing batching machine 17, and the second negative pressure device 20 is also connected to the third suction machine 19 and is used to create negative pressure in the third suction machine 19 so that the third suction machine 19 sucks the material in the drying tank 12 into the weighing batching machine 17;

[0078] The fourth suction machine 22 is connected to the upper end of the feed hopper 24, the feed port of the fourth suction machine 22 is connected to the weighing batching machine 17, the discharge port of the fourth suction machine 22 is connected to the feed hopper 24, the third negative pressure device 23 is connected to the fourth suction machine 22 and is used to create negative pressure in the fourth suction machine 22 so that the fourth suction machine 22 sucks the mixed material in the weighing batching machine 17 into the feed hopper 24, and then the material in the feed hopper 24 falls into the extruder 1; wherein the material in the feed hopper 24 can be a mixed material of a specific ratio. The specific structures of the drying tank 12, the dehumidifier 13, the weighing batching machine 17, the first suction machine 14, the second suction machine 18, the third suction machine 19 and the fourth suction machine 22 are all existing technologies well known to those skilled in the art, and will not be described in detail in this embodiment. The first negative pressure device 15, the second negative pressure device 20 and the third negative pressure device 23 can all be negative pressure fans. More specifically, the weighing batching machine 17 can be a 4-component weighing batching machine 17, and the first material container 16 and the second material container 21 are used to store materials.

[0079] Specifically, the multi-layer co-extrusion sheet production line may further include a vacuum feeder;

[0080] The feed port of the co-extruder 2 is connected to a feed hopper 25;

[0081] The vacuum loader is connected to the feeding hopper 25 and is used to transport the material into the feeding hopper 25, and then the material in the feeding hopper 25 falls into the co-extruder 2; in this embodiment, the material in the feeding hopper 25 is different from the material in the feeding hopper 24, and the feeding hopper 24 and the feeding hopper 25 are both insulation hoppers.

[0082] like Figure 4 , 6 As shown, the film pressing mechanism 10 may include a fixing frame 26, a pressing seat 27, an upper pressing roller 28, a lower pressing roller 29 and a pressing cylinder 30;

[0083] The upper film supply mechanism 8 may include an upper bracket 31, at least one upper unwinding roller 32 and at least one upper guide roller 33;

[0084] The lower film supply mechanism 9 may include a lower support 34, at least one lower unwinding roller 35 and at least one lower guide roller 36;

[0085] The fixing frame 26 is connected to the cooling bracket 5;

[0086] The pressure seat 27 is slidably connected to the fixing frame 26;

[0087] The upper pressing roller 28 is rotatably connected to the pressing seat 27, and the lower pressing roller 29 is rotatably connected to the fixing frame 26, so that the plate on the cooling bracket 5 passes between the upper pressing roller 28 and the lower pressing roller 29;

[0088] The upper unwinding roller 32 and the upper guide roller 33 are respectively connected to the upper bracket 31;

[0089] The upper unwinding roller 32 is provided with an upper film roll, and the protective film 11 released from the upper film roll is wound around the upper guide roller 33 and then extends between the upper pressing roller 28 and the plate;

[0090] The lower unwinding roller 35 and the lower guide roller 36 are respectively connected to the lower bracket 34;

[0091] The lower unwinding roller 35 is provided with a lower film roll, and the protective film 11 released from the lower film roll is wound around the lower guide roller 36 and then extends between the lower pressing roller 29 and the plate;

[0092] The clamping cylinder 30 is connected to the fixed frame 26, and the clamping cylinder 30 is connected to the pressure seat 27 and is used to drive the pressure seat 27 to move downward and then drive the upper pressure roller 28 to move toward the lower pressure roller 29 so that the upper pressure roller 28 presses the protective film 11 on the upper surface of the plate and the lower pressure roller 29 presses the protective film 11 on the lower surface of the plate; in this embodiment, the lower bracket 34 is provided with one and fixedly connected to the ground, and the upper bracket 31 is provided with two, one of which is connected to the lower bracket 34, and the other is connected to the cooling bracket 5; wherein, the upper unwinding roller 32 and the lower unwinding roller 35 are also provided with two respectively.

[0093] like Figure 4 , 6 As shown, the multi-layer co-extrusion sheet production line further includes a heating mechanism located in front of the film pressing mechanism 10, and the heating mechanism includes a lifting cylinder 37, an upper ceramic heating plate 38 and a lower ceramic heating plate 39;

[0094] The lower ceramic heating plate 39 is connected to the cooling bracket 5 and is located below the plate;

[0095] The upper ceramic heating plate 38 is connected to the lifting cylinder 37 and is located above the plate;

[0096] The lifting cylinder 37 is connected to the upper bracket 31 and is used to drive the upper ceramic heating plate 38 to rise and fall, thereby realizing the opening and closing of the upper ceramic heating plate 38 and the lower ceramic heating plate 39. Heating the plate by the upper ceramic heating plate 38 and the lower ceramic heating plate 39 can enable the protective film 11 to be better pressed onto the plate.

[0097] like Figure 1 , 3 As shown, the multi-layer co-extruded sheet production line may further include a cooling device 40 located between the three-roll calender 4 and the first traction machine 6, wherein the cooling device 40 includes a mounting frame, a driving mechanism 41 and a plurality of cooling rollers 42;

[0098] The cooling rollers 42 are rotatably connected to the mounting frame, arranged in sequence along the extension direction of the plate, and used to support the plate;

[0099] The driving mechanism 41 is connected to the mounting frame, connected to the cooling roller 42 and used to drive the cooling roller 42 to rotate, thereby conveying the plate to move; specifically, after cooling water is passed into the cooling roller 42, the temperature of the cooling roller 42 can be reduced, and then the plate is cooled by the contact between the cooling roller 42 and the plate; wherein, the specific structure of the cooling roller 42 is a prior art well known to those skilled in the art, and will not be described in detail in this embodiment. More specifically, the driving mechanism 41 includes a driving motor, which is connected to the cooling roller 42 through a chain transmission, and adjacent cooling rollers 42 are also connected through a chain transmission; in this embodiment, there are 5 cooling rollers 42, and the mounting frame is connected to the wall panel of the three-roll calender 4.

[0100] Specifically, a trimming device 43 is provided between the first traction machine 6 and the cooling device 40. The trimming device 43 is used to cut off the waste edges on both sides of the plate. The trimming device 43 can adopt the linkage trimming device disclosed in the Chinese patent publication number CN216609749U.

[0101] Specifically, the multi-layer co-extrusion sheet production line may further include a first screen changer, a second screen changer, a first metering pump, a second metering pump and a distributor;

[0102] The discharge port of the extruder 1 is connected to the first screen changer, and the first screen changer is connected to the first metering pump;

[0103] The discharge port of the co-extruder 2 is connected to the second screen changer, and the second screen changer is connected to the second metering pump;

[0104] The first metering pump and the second metering pump are respectively connected to the distributor, and the distributor is connected to the co-extrusion die 3. The material in the extruder 1 passes through the first screen changer and the first metering pump and then flows into the distributor and then into the co-extrusion die 3. The material in the co-extruder 2 passes through the second screen changer and the second metering pump and then flows into the distributor and then into the co-extrusion die 3; wherein, the first screen changer and the second screen changer can filter out impurities in the material, and the specific structure of the distributor is the prior art well known to those skilled in the art, and will not be described in detail in this embodiment.

[0105] like Figure 1 , 4 As shown, the multi-layer co-extruded sheet production line may further include a longitudinal saw 44 and a transverse saw 45. After the sheet passes through the second tractor 7, it passes through the longitudinal saw 44 and the transverse saw 45 in sequence.

[0106] The longitudinal saw 44 is located behind the second tractor 7 and is used to cut the board longitudinally to separate the board into

[0107] The cross-cutting saw 45 is located behind the longitudinal cutting saw 44 and is used to cut the plate in the transverse direction to cut the plate into a required length; specifically, the specific structures of the longitudinal cutting saw 44 and the cross-cutting saw 45 are prior arts well known to those skilled in the art and are not described in detail in this embodiment.

[0108] like Figure 1 , 5 As shown, the multi-layer co-extrusion sheet production line may also include a conveyor 46 and a hydraulic lifting platform 47;

[0109] The conveyor 46 is located behind the cross-cut saw 45 and is used to receive the plates cut by the cross-cut saw 45 and convey the plates to the hydraulic lifting platform 47;

[0110] The hydraulic lifting platform 47 is located behind the conveyor 46 and is used to receive the plates delivered by the conveyor 46. The height of the hydraulic lifting platform 47 can be automatically adjusted according to the height of the plate stack, so that the plates can be stacked and placed on the hydraulic lifting platform 47. In this embodiment, the conveyor 46 can be a belt conveyor 46.

[0111] like Figure 1 , 4 As shown, the multi-layer co-extruded sheet production line may further include a waste film winding device located between the longitudinal saw 44 and the transverse saw 45, wherein the waste film winding device includes at least one upper winding mechanism 48 located above the sheet and at least one lower winding mechanism 49 located below the sheet;

[0112] The upper winding mechanism 48 and the lower winding mechanism 49 respectively include a winding frame 50, a winding drum 51 and a winding motor 52;

[0113] The winding drum 51 is rotatably connected to the winding frame 50;

[0114] The winding motor 52 is connected to the winding frame 50 and connected to the winding drum 51 and is used to drive the winding drum 51 to rotate; specifically, after the longitudinal saw 44 cuts the plate into the required width, waste strips will be formed on both sides of the plate, and the protective film 11 on the upper surface of the waste strip is wound on the winding drum 51 in the upper winding mechanism 48, and the protective film 11 on the lower surface of the waste strip is wound on the winding drum 51 in the lower winding mechanism 49. When the winding motor 52 drives the winding drum 51 to rotate, the protective film 11 on the waste strip can be torn off and wound. In this embodiment, the upper winding mechanism 48 is provided with two on the left and the right, and the lower winding mechanism 49 is also provided with two on the left and the right, and the winding frame 50 can be connected to the frame of the longitudinal saw 44. Specifically, a third traction machine 53 for pulling the plate to move is also provided between the waste film winding device and the longitudinal saw 44.

[0115] In summary, the extruder 1 and the co-extruder 2 extrude the material into the co-extrusion die 3 respectively. After being extruded from the co-extrusion die 3, the material passes through the three-roll calender 4, the first tractor 6, the cooling bracket 5 and the second tractor 7 in sequence. The first tractor 6 and the second tractor 7 provide power for the movement of the material. The three-roll calender 4 is used to calender the sheet material so that the sheet material reaches the required thickness and brightness. The sheet material can be naturally cooled and shaped on the cooling bracket 5. When the sheet material on the cooling bracket 5 is cooled and shaped, the film pressing mechanism 10 presses the protective film 11 released from the upper film supply mechanism 8 onto the upper surface of the sheet material and presses the protective film 11 released from the lower film supply mechanism 9 onto the lower surface of the sheet material, thereby affixing the protective film 11 to the surface of the sheet material, which can prevent the sheet material from being scrapped due to accidental scratches.

[0116] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-layer co-extrusion sheet production line, characterized in that: It comprises an extruder (1), a co-extruder (2), a co-extrusion die (3), a three-roll calender (4), a cooling bracket (5), a first traction machine (6), a second traction machine (7), an upper film supply mechanism (8), a lower film supply mechanism (9) and a film pressing mechanism (10); The discharge port of the extruder (1) and the discharge port of the co-extruder (2) are respectively connected to the co-extrusion die (3); the extruder (1) and the co-extruder (2) are respectively used to extrude the material into the co-extrusion die (3) and extrude the material through the co-extrusion die (3) to obtain a plate; the plate passes through the three-roll calender (4), the first tractor (6), the cooling bracket (5) and the second tractor (7) in sequence; The three-roll calender (4) is located behind the co-extrusion die (3) and is used to calender the plate; The first traction machine (6) is located behind the three-roll calender (4) and is used to pull the plate to move backward; The cooling bracket (5) is located behind the first tractor (6) and is used to hold the plate so that the plate can be cooled and shaped on the cooling bracket (5); The second traction machine (7) is located behind the cooling bracket (5) and is used to pull the plate to move backward; The upper film supply mechanism (8) is located above the cooling bracket (5) and is used to release the protective film (11); the protective film (11) released from the upper film supply mechanism (8) is located above the plate on the cooling bracket (5) and extends into the film pressing mechanism (10); The lower film supply mechanism (9) is located below the cooling bracket (5) and is used to release the protective film (11); the protective film (11) released from the lower film supply mechanism (9) is located below the plate on the cooling bracket (5) and extends into the film pressing mechanism (10); The film pressing mechanism (10) is connected to the cooling bracket (5) and is used to press the protective film (11) released from the upper film supply mechanism (8) onto the upper surface of the plate and to press the protective film (11) released from the lower film supply mechanism (9) onto the lower surface of the plate.

2. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The invention also comprises a feeding system, wherein the feeding system comprises a drying tank (12), a dehumidifier (13), a first suction machine (14), a first negative pressure device (15), a first material container (16), a weighing batching machine (17), a second suction machine (18), a third suction machine (19), a second negative pressure device (20), a second material container (21), a fourth suction machine (22) and a third negative pressure device (23); The feed port of the extruder (1) is connected to a feed hopper (24); The first suction machine (14) is connected to the upper end of the drying tank (12); the feeding port of the first suction machine (14) is connected to the first material container (16); the discharging port of the first suction machine (14) is connected to the drying tank (12); the first negative pressure device (15) is connected to the first suction machine (14) and is used to create negative pressure in the first suction machine (14) so ​​that the first suction machine (14) sucks the material in the first material container (16) into the drying tank (12); The dehumidifier (13) is connected to the drying tank (12) and is used to send dry air into the drying tank (12) to dry the material in the drying tank (12); The second suction machine (18) is connected to the upper end of the weighing batching machine (17), the feeding port of the second suction machine (18) is connected to the second material container (21), the discharging port of the second suction machine (18) is connected to the weighing batching machine (17), and the second negative pressure device (20) is connected to the second suction machine (18) and is used to create negative pressure in the second suction machine (18) so that the second suction machine (18) sucks the material in the second material container (21) into the weighing batching machine (17); The third suction machine (19) is connected to the upper end of the weighing batching machine (17), the feeding port of the third suction machine (19) is connected to the drying tank (12), the discharging port of the third suction machine (19) is connected to the weighing batching machine (17), and the second negative pressure device (20) is also connected to the third suction machine (19) and is used to create negative pressure in the third suction machine (19) so that the third suction machine (19) sucks the material in the drying tank (12) into the weighing batching machine (17); The fourth suction machine (22) is connected to the upper end of the feeding hopper (24), the feeding port of the fourth suction machine (22) is connected to the weighing batching machine (17), the discharging port of the fourth suction machine (22) is connected to the feeding hopper (24), and the third negative pressure device (23) is connected to the fourth suction machine (22) and is used to create negative pressure in the fourth suction machine (22) so that the fourth suction machine (22) sucks the mixed material in the weighing batching machine (17) into the feeding hopper (24).

3. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: Also includes vacuum loader; The feed port of the co-extruder (2) is connected to a feed hopper (25); The vacuum loader is connected to the feeding hopper (25) and is used to transport materials into the feeding hopper (25).

4. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The film pressing mechanism (10) comprises a fixing frame (26), a pressing seat (27), an upper pressing roller (28), a lower pressing roller (29) and a pressing cylinder (30); The upper film supply mechanism (8) comprises an upper bracket (31), at least one upper unwinding roller (32) and at least one upper guide roller (33); The lower film supply mechanism (9) comprises a lower support (34), at least one lower unwinding roller (35) and at least one lower guide roller (36); The fixing frame (26) is connected to the cooling bracket (5); The pressure seat (27) is slidably connected to the fixing frame (26); The upper pressing roller (28) is rotatably connected to the pressing seat (27), the lower pressing roller (29) is rotatably connected to the fixing frame (26), and the plate on the cooling bracket (5) passes between the upper pressing roller (28) and the lower pressing roller (29); The upper unwinding roller (32) and the upper guide roller (33) are respectively connected to the upper bracket (31); An upper film roll is mounted on the upper unwinding roller (32), and the protective film (11) released from the upper film roll is wound around the upper guide roller (33) and then extends between the upper pressing roller (28) and the plate; The lower unwinding roller (35) and the lower guide roller (36) are respectively connected to the lower bracket (34); The lower unwinding roller (35) is provided with a lower film roll, and the protective film (11) released from the lower film roll is wound around the lower guide roller (36) and then extends to between the lower pressing roller (29) and the plate; The pressing cylinder (30) is connected to the fixing frame (26), and the pressing cylinder (30) is connected to the pressing seat (27) and is used to drive the pressing seat (27) to move downward, thereby driving the upper pressing roller (28) to move toward the lower pressing roller (29) so that the upper pressing roller (28) presses the protective film (11) onto the upper surface of the plate and the lower pressing roller (29) presses the protective film (11) onto the lower surface of the plate.

5. The multi-layer co-extrusion sheet production line according to claim 4, characterized in that: It also includes a heating mechanism located in front of the film pressing mechanism (10), the heating mechanism including a lifting cylinder (37), an upper ceramic heating plate (38) and a lower ceramic heating plate (39); The lower ceramic heating plate (39) is connected to the cooling bracket (5) and is located below the plate; The upper ceramic heating plate (38) is connected to the lifting cylinder (37) and is located above the plate; The lifting cylinder (37) is connected to the upper bracket (31) and is used to drive the upper ceramic heating plate (38) to move up and down.

6. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: It also includes a cooling device (40) located between the three-roll calender (4) and the first traction machine (6), wherein the cooling device (40) includes a mounting frame, a driving mechanism (41) and a plurality of cooling rollers (42); The cooling rollers (42) are rotatably connected to the mounting frame, are arranged in sequence along the extension direction of the plate, and are used to support the plate; The driving mechanism (41) is connected to the mounting frame, connected to the cooling roller (42), and is used to drive the cooling roller (42) to rotate.

7. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: It also includes a first screen changer, a second screen changer, a first metering pump, a second metering pump and a distributor; The discharge port of the extruder (1) is connected to the first screen changer, and the first screen changer is connected to the first metering pump; The discharge port of the co-extruder (2) is connected to the second screen changer, and the second screen changer is connected to the second metering pump; The first metering pump and the second metering pump are respectively connected to the distributor, and the distributor is connected to the co-extrusion die (3).

8. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: It also includes a longitudinal saw (44) and a cross-cut saw (45), and the plate passes through the longitudinal saw (44) and the cross-cut saw (45) in sequence after passing through the second tractor (7); The longitudinal saw (44) is located behind the second tractor (7) and is used to cut the board in the longitudinal direction to cut the board into a desired width; The cross-cut saw (45) is located behind the longitudinal saw (44) and is used to cut the board in a transverse direction to cut the board into a desired length.

9. The multi-layer co-extrusion sheet production line according to claim 8, characterized in that: Also includes a conveyor (46) and a hydraulic lift (47); The conveyor (46) is located behind the cross-cutting saw (45) and is used to receive the plates cut by the cross-cutting saw (45) and convey the plates to the hydraulic lifting platform (47); The hydraulic lifting platform (47) is located behind the conveyor (46) and is used to receive the plates delivered by the conveyor (46).

10. The multi-layer co-extrusion sheet production line according to claim 8, characterized in that: It also includes a waste film winding device located between the longitudinal cutting saw (44) and the cross-cutting saw (45), and the waste film winding device includes at least one upper winding mechanism (48) located above the plate and at least one lower winding mechanism (49) located below the plate; The upper winding mechanism (48) and the lower winding mechanism (49) respectively comprise a winding frame (50), a winding drum (51) and a winding motor (52); The winding drum (51) is rotatably connected to the winding frame (50); The winding motor (52) is connected to the winding frame (50) and to the winding drum (51) and is used to drive the winding drum (51) to rotate.

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