Plate extrusion production line

Abstract

The utility model discloses a plate extrusion production line which comprises a heat preservation heating device, and an extruder, a mold, a three-roller calender, a cooling bracket and a traction machine which are arranged in sequence, wherein the mold is connected to the extruder, the extruder is used for extruding materials from the mold to obtain a product, the three-roller calender is internally provided with an upper roller, a middle roller and a lower roller which are sequentially arranged from top to bottom, and the cooling bracket is used for supporting the product to cool the product on the cooling bracket. The heat preservation heating device is connected to the three-roller calender, arranged on one side of the middle roller and used for conducting heating and heat preservation on the outer surface of a product wound on the middle roller. According to the utility model, the outer surface of a product wound on the middle roller can be heated and insulated so as to reduce the cooling speed of the outer surface of the product, and the two surfaces of the product wound on the middle roller can be uniformly and slowly cooled, so that the problems of deformation and non-uniform thickness of the product can be avoided.

Description

Technical Field

[0001] This utility model relates to a sheet extrusion production line. Background Technology

[0002] Currently, sheet extrusion production lines are used to produce sheet and plate products. In these lines, the raw material is heated and plasticized by the extruder before being extruded into a die, and then extruded to obtain the finished product. The product is very hot immediately after extrusion; if it is cooled directly in air, the rapid cooling will cause deformation and uneven thickness. Therefore, the product freshly extruded from the die needs to be fed into a three-roll calender for cooling and shaping. The rollers in the three-roll calender are all heated, with their temperature higher than the air temperature but lower than the product temperature. This reduces the temperature difference between the product and the rollers. When the product comes into contact with the rollers, it slowly transfers heat to the rollers, allowing for slow cooling and shaping, thus preventing deformation or uneven thickness. For example, Chinese patent CN201552790U discloses a PVC board / sheet production line, in which the product is extruded from a mold and directly enters a three-roll calender. The freshly extruded product first passes between the middle and lower rolls and wraps around the middle roll, and then passes between the middle and upper rolls and wraps around the upper roll. However, the product is at its hottest when it is wrapped around the middle roll. At this time, the inner surface of the product is in contact with the middle roll and cools slowly, while the outer surface of the product is in contact with the air and cools rapidly. This results in an uneven cooling rate between the two surfaces of the product, which in turn leads to problems such as deformation and uneven thickness. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a sheet extrusion production line that can heat and keep the outer surface of the product wound on the middle roller to reduce the cooling rate of the outer surface of the product, so as to make the two surfaces of the product wound on the middle roller cool evenly and slowly, thereby avoiding the problems of product deformation and uneven thickness.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a sheet extrusion production line, including a heat preservation and heating device and an extruder, a die, a three-roll calender, a cooling bracket and a traction machine arranged in sequence;

[0005] The die is connected to the extruder, which is used to extrude material from the die to obtain an article;

[0006] The three-roll calender has an upper roll, a middle roll, and a lower roll arranged sequentially from top to bottom. The product extruded from the die first passes between the middle roll and the lower roll and wraps around the middle roll, then passes between the middle roll and the upper roll and wraps around the upper roll, and then extends sequentially into the cooling bracket and the traction machine.

[0007] The traction machine is used to pull the product forward;

[0008] The cooling bracket is used to support the product for cooling on the cooling bracket;

[0009] The heat preservation and heating device is connected to the three-roll calender. The heat preservation and heating device is located on one side of the middle roll and is used to heat and preserve the outer surface of the product wound on the middle roll.

[0010] Furthermore, the three-roll calender includes a frame, and the heat preservation and heating device is slidably connected to the frame and used to slide toward or away from the middle roll to adjust the distance between the heat preservation and heating device and the middle roll.

[0011] Furthermore, the heat preservation and heating device is slidably connected to the frame via at least one sliding component;

[0012] The sliding assembly includes a guide post, a guide sleeve, a front stop, a rear stop, a front locking screw, and a rear locking screw;

[0013] The guide post is connected to the frame, the guide sleeve is connected to the heat preservation and heating device, and the guide sleeve is slidably connected to the guide post;

[0014] The front stop is slidably sleeved on the guide post and is used to slide until it abuts against the front end of the guide sleeve;

[0015] The rear stop is slidably sleeved on the guide post and is used to slide until it abuts against the rear end of the guide sleeve;

[0016] The front locking screw is threaded onto the front stop and is used to be screwed onto the guide post to lock the position of the front stop on the guide post;

[0017] The rear locking screw is threaded onto the rear stop and is used to screw it against the guide post, thereby locking the rear stop on the guide post.

[0018] Further, a specific structure of the heat preservation and heating device is provided, wherein the heat preservation and heating device includes an arc-shaped cover and at least one heating tube;

[0019] The arc-shaped cover is disposed on one side of the middle roller, and the product passes through the arc-shaped cover and the middle roller;

[0020] The heating tube is connected to the arc-shaped cover and is used to heat and keep the outer surface of the product wound on the middle roller.

[0021] Further, a specific structure of the arc-shaped cover is provided, wherein the arc-shaped cover includes a main body plate, a support plate, an upper side plate, a lower side plate, a left side plate, and a right side plate;

[0022] The support plate is connected to the main body plate, the heating tube is connected to the support plate, and both the support plate and the heating tube are located on the side of the main body plate facing the middle roller;

[0023] The upper side plate is connected to the upper end of the main body plate, the lower side plate is connected to the lower end of the main body plate, the left side plate is connected to the left end of the main body plate, and the right side plate is connected to the right end of the main body plate.

[0024] The upper side plate, the left side plate, the lower side plate, and the right side plate are connected end to end and surround the outside of the heating tube.

[0025] Furthermore, the three-roll calender includes a frame, a mounting base, an upper slide, a lower slide, an upper screw jack, and a lower screw jack;

[0026] The mounting base is connected to the frame, and the intermediate roller is rotatably connected to the mounting base;

[0027] The upper slide block is slidably connected to the frame in a vertical direction, and the upper roller is rotatably connected to the upper slide block;

[0028] The lower slide block is slidably connected to the frame vertically, and the lower roller is rotatably connected to the lower slide block;

[0029] The upper screw jack is connected to the frame. The upper screw jack is connected to the upper slide block and is used to drive the upper slide block to move, thereby driving the upper roller to move to adjust the gap between the upper roller and the middle roller.

[0030] The lower screw jack is connected to the frame and is connected to the lower slide block and is used to drive the lower slide block to move, thereby driving the lower roller to move to adjust the gap between the lower roller and the middle roller.

[0031] Furthermore, the sheet extrusion production line also includes an electrostatic eliminator for eliminating static electricity on the surface of the product.

[0032] Furthermore, the sheet extrusion production line also includes a longitudinal cutting device, a support bracket, a stacking platform, and a transverse cutting machine;

[0033] The traction machine, the longitudinal cutting device, and the support bracket are arranged in sequence. After passing through the traction machine, the product is pulled and sequentially extended into the longitudinal cutting device and onto the support bracket.

[0034] The longitudinal cutting device is used to cut the product along its length direction.

[0035] The support bracket is used to receive the products cut by the longitudinal cutting device;

[0036] The transverse cutting machine is used to cut the product on the support bracket along the width direction of the product;

[0037] The stacking platform is used to receive and stack products delivered from the support bracket.

[0038] Further, a specific structure of the longitudinal cutting device is provided, the longitudinal cutting device including a cutting frame, a transverse slide, a transverse drive mechanism, a lifting seat, a lifting cylinder, a motor and a saw blade;

[0039] The transverse slide block is slidably connected to the cutting frame along the width direction of the product;

[0040] The transverse drive mechanism is mounted on the cutting frame and connected to the transverse slide block, and is used to drive the transverse slide block to slide into position along the width direction of the product;

[0041] The lifting seat is slidably connected to the transverse sliding seat in the vertical direction;

[0042] The motor is connected to the lifting base;

[0043] The lifting cylinder is connected to the transverse slide and to the lifting seat. The lifting cylinder is used to drive the lifting seat to move up and down relative to the transverse slide, thereby driving the motor to lift.

[0044] The saw blade is connected to the motor, which drives the saw blade to rotate so that the saw blade cuts the product along its length.

[0045] Further, a specific structure of the lateral movement drive mechanism is provided, wherein the lateral movement drive mechanism includes a transmission screw, a transmission nut, and a handwheel;

[0046] The drive screw is rotatably connected to the cutting frame;

[0047] The transmission nut is connected to the transverse slide and is connected in conjunction with the transmission screw.

[0048] The handwheel is connected to the transmission screw and is used to drive the transmission screw to rotate.

[0049] After adopting the above technical solution, the extruder melts and plasticizes the material and then extrudes it into the mold. The material is then extruded from the mold to obtain the product. The product first passes between the middle roller and the lower roller and wraps around the middle roller, then passes between the middle roller and the upper roller and wraps around the upper roller, and then extends sequentially into the cooling bracket and the traction machine. As is well known, the upper roller, middle roller, and lower roller are all heated rollers. The temperature of the upper roller, middle roller, and lower roller is heated to a temperature higher than the air temperature but lower than the product temperature, thereby reducing the temperature difference between them and the product, allowing the product to cool down slowly. Immediately after being extruded from the mold, the product passes directly between the middle roller and the lower roller and wraps around the middle roller. At this point, the product temperature is highest, and the inner surface of the product contacts the middle roller, thus cooling down slowly. The outer surface of the product faces the heat preservation and heating device, which heats and preserves the outer surface of the product wrapped around the middle roller, thereby reducing the cooling rate of the outer surface of the product. This allows both surfaces of the product wrapped around the middle roller to cool down evenly and slowly, thus avoiding problems such as product deformation and uneven thickness. When the product is wound on the upper roller, its temperature has already decreased, making it less prone to deformation and uneven thickness. Attached Figure Description

[0050] Figure 1 This is a front view of the sheet extrusion production line of this utility model;

[0051] Figure 2 This is a top view of the sheet extrusion production line of this utility model;

[0052] Figure 3 This is a front view of the three-roll calender of this utility model;

[0053] Figure 4 This is a schematic diagram of the heat preservation and heating device of this utility model;

[0054] Figure 5 This is a schematic diagram of the sliding component of this utility model;

[0055] Figure 6 This is a schematic diagram of the longitudinal cutting device of this utility model. Detailed Implementation

[0056] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0057] like Figures 1-6 As shown, a sheet extrusion production line includes a heat preservation and heating device 1 and an extruder 2, a die 3, a three-roll calender 4, a cooling bracket 5 and a traction machine 6 arranged in sequence.

[0058] The mold 3 is connected to the extruder 2, which is used to extrude material from the mold 3 to obtain the product 100;

[0059] The three-roll calender 4 has an upper roll 7, a middle roll 8 and a lower roll 9 arranged sequentially from top to bottom. The product 100 extruded from the mold 3 first passes between the middle roll 8 and the lower roll 9 and wraps around the middle roll 8, then passes between the middle roll 8 and the upper roll 7 and wraps around the upper roll 7, and then extends sequentially into the cooling bracket 5 and the traction machine 6.

[0060] The cooling bracket 5 is used to support the product 100 so that the product 100 can be cooled on the cooling bracket 5;

[0061] The traction machine 6 is used to pull the product 100 forward;

[0062] The heat preservation and heating device 1 is connected to the three-roll calender 4. The heat preservation and heating device 1 is located on one side of the middle roll 8 and is used to heat and preserve the outer surface of the product 100 wrapped on the middle roll 8.

[0063] Specifically, the extruder 2 melts and plasticizes the material and then extrudes it into the mold 3. The material is then extruded from the mold 3 to obtain the product 100. The product 100 first passes between the middle roller 8 and the lower roller 9 and wraps around the middle roller 8, then passes between the middle roller 8 and the upper roller 7 and wraps around the upper roller 7, and then extends sequentially into the cooling bracket 5 and the traction machine 6. As is well known, the upper roller 7, middle roller 8, and lower roller 9 are all heated rollers. The temperature of the upper roller 7, middle roller 8, and lower roller 9 is heated to a temperature higher than the air temperature but lower than the temperature of the product 100, thereby reducing the temperature difference with the product 100 and allowing the product 100 to cool down slowly. After the product 100 is extruded from the mold 3, it passes directly between the middle roller 8 and the lower roller 9 and wraps around the middle roller 8. At this time, the temperature of the product 100 is the highest. The inner surface of the product 100 is in contact with the middle roller 8 and thus cools down slowly. The outer surface of the product 100 faces the heat preservation and heating device 1. The heat preservation and heating device 1 can heat and preserve the outer surface of the product 100 wrapped around the middle roller 8, thereby reducing the cooling rate of the outer surface of the product 100. This allows both surfaces of the product 100 wrapped around the middle roller 8 to cool down evenly and slowly, thus avoiding problems such as deformation and uneven thickness of the product 100. When the product 100 is wrapped around the upper roller 7, the temperature of the product 100 has already decreased, and at this time, the product 100 is less likely to deform or have uneven thickness. More specifically, in this embodiment, the product 100 can be a sheet or plate. The specific structures of the extruder 2, the mold 3, the cooling bracket 5 and the traction machine 6 are all existing technologies well known to those skilled in the art, and will not be described in detail in this embodiment. The upper roller 7, the middle roller 8 and the lower roller 9 can all be heat-conducting oil heated rollers.

[0064] like Figure 1 , 3 As shown in Figures 4 and 5, the three-roll calender 4 includes a frame, and the heat preservation and heating device 1 is slidably connected to the frame and is used to slide toward or away from the middle roll 8 to adjust the distance between the heat preservation and heating device 1 and the middle roll 8.

[0065] like Figures 3-5 As shown, the heat preservation and heating device 1 can be slidably connected to the frame via at least one sliding component 10;

[0066] The sliding assembly 10 includes, for example but not limited to, the following structure: guide post 11, guide sleeve 12, front stop 13, rear stop 14, front locking screw 15, and rear locking screw 16.

[0067] The guide post 11 is connected to the frame, the guide sleeve 12 is connected to the heat preservation and heating device 1, and the guide sleeve 12 is slidably connected to the guide post 11, thereby indirectly allowing the heat preservation and heating device 1 to be slidably connected to the frame.

[0068] The front stop 13 is slidably sleeved on the guide post 11 and is used to slide until it abuts against the front end of the guide sleeve 12;

[0069] The rear stop 14 is slidably sleeved on the guide post 11 and is used to slide until it abuts against the rear end of the guide sleeve 12;

[0070] The front locking screw 15 is threaded onto the front stop 13 and is used to be screwed to abut against the guide post 11, thereby locking the position of the front stop 13 on the guide post 11;

[0071] The rear locking screw 16 is threaded onto the rear stop 14 and is used to tighten it to abut against the guide post 11, thereby locking the rear stop 14 in position on the guide post 11. Specifically, sliding the guide sleeve 12 on the guide post 11 allows the heat preservation and heating device 1 to slide relative to the frame, thereby allowing the heat preservation and heating device 1 to slide towards or away from the middle roller 8 to adjust the distance between the heat preservation and heating device 1 and the middle roller 8. After the guide sleeve 12 has slid into place, the front stop 13 abuts against the front end of the guide sleeve 12, and the rear stop 14 abuts against the rear end of the guide sleeve 12. Then, the front locking screw 15 and the rear locking screw 16 are tightened to fix the positions of the front stop 13 and the rear stop 14, thereby limiting the position of the guide sleeve 12. In this embodiment, two sliding components 10 are provided.

[0072] like Figures 3-5 As shown, the heat preservation and heating device 1 may include an arc-shaped cover 17 and at least one heating tube 18;

[0073] The arc-shaped cover 17 is disposed on one side of the middle roller 8, and the product 100 passes through the arc-shaped cover 17 and the middle roller 8;

[0074] The heating tube 18 is connected to the arc-shaped cover 17 and is used to heat and keep the outer surface of the product 100 wound on the middle roller 8. In this embodiment, the arc-shaped cover 17 in the heat preservation and heating device 1 is slidably connected to the frame through the sliding assembly 10, and the guide sleeve 12 is connected to the arc-shaped cover 17 in the heat preservation and heating device 1 through the connecting plate. Among them, multiple heating tubes 18 are arranged sequentially along the arc path.

[0075] like Figures 3-5 As shown, the arc-shaped cover 17 may include a main body plate 19, a support plate 20, an upper side plate 21, a lower side plate 22, a left side plate 23, and a right side plate 24;

[0076] The support plate 20 is connected to the main body plate 19, and the heating tube 18 is connected to the support plate 20. Both the support plate 20 and the heating tube 18 are located on the side of the main body plate 19 facing the middle roller 8.

[0077] The upper side plate 21 is connected to the upper end of the main body plate 19;

[0078] The lower side plate 22 is connected to the lower end of the main body plate 19;

[0079] The left side plate 23 is connected to the left end of the main body plate 19;

[0080] The right side plate 24 is connected to the right end of the main body plate 19;

[0081] The upper side plate 21, the left side plate 23, the lower side plate 22 and the right side plate 24 are connected end to end and surround the outside of the heating tube 18.

[0082] like Figure 3 As shown, the three-roll calender 4 may include a frame, a mounting base 25, an upper slide 26, a lower slide 27, an upper screw jack 28, and a lower screw jack 29;

[0083] The mounting base 25 is connected to the frame, and the middle roller 8 is rotatably connected to the mounting base 25;

[0084] The upper slide block 26 is slidably connected to the frame in a vertical direction, the upper roller 7 is rotatably connected to the upper slide block 26, the lower slide block 27 is slidably connected to the frame in a vertical direction, and the lower roller 9 is rotatably connected to the lower slide block 27.

[0085] The upper screw jack 28 is connected to the frame. The upper screw jack 28 is connected to the upper slide block 26 and is used to drive the upper slide block 26 to move, thereby driving the upper roller 7 to move to adjust the gap between the upper roller 7 and the middle roller 8.

[0086] The lower screw jack 29 is connected to the frame and is connected to the lower slide seat 27 and is used to drive the lower slide seat 27 to move, thereby driving the lower roller 9 to move to adjust the gap between the lower roller 9 and the middle roller 8. In this embodiment, two of the mounting base 25, the upper slide seat 26, the lower slide seat 27, the upper screw jack 28 and the lower screw jack 29 are arranged side by side.

[0087] like Figure 1 As shown, the sheet extrusion production line may also include an electrostatic eliminator 30 for eliminating static electricity on the surface of the product 100.

[0088] like Figure 1 , 2 As shown, the sheet extrusion production line may also include a longitudinal cutting device 31, a support bracket 32, a stacking platform 33, and a transverse cutting machine 34;

[0089] The traction machine 6, the longitudinal cutting device 31 and the supporting bracket 32 ​​are arranged in sequence. After passing through the traction machine 6, the product 100 is pulled and extended sequentially into the longitudinal cutting device 31 and onto the supporting bracket 32.

[0090] The longitudinal cutting device 31 is used to cut the product 100 along the length direction of the product 100;

[0091] The support bracket 32 ​​is used to receive the product 100 after it has been cut by the longitudinal cutting device 31;

[0092] The transverse cutting machine 34 is used to cut the product 100 on the support bracket 32 ​​along the width direction of the product 100;

[0093] The stacking platform 33 is used to receive and stack the products 100 delivered from the support bracket 32. Specifically, after the products 100 are completely cooled and formed on the cooling bracket 5, they continue to move forward under the traction of the traction machine 6 and extend into the longitudinal cutting device 31. The longitudinal cutting device 31 is used to cut the 500mm wide product 100 into two 250mm wide products 100 along the length direction. The cut products 100 are moved onto the support bracket 32. The transverse cutting machine 34 is used to cut the products 100 on the support bracket 32 ​​along the width direction of the products 100 to cut the products 100 into the required length. Then, the cut products 100 are conveyed on the support bracket 32 ​​to the stacking platform 33 for stacking. In this embodiment, the static eliminator 30 is located between the longitudinal cutting device 31 and the support bracket 32.

[0094] like Figure 6 As shown, the longitudinal cutting device 31 may include a cutting frame 35, a transverse slide 36, a transverse drive mechanism 37, a lifting seat, a lifting cylinder 38, a motor 39, and a saw blade 40;

[0095] The transverse slide block 36 is slidably connected to the cutting frame 35 along the width direction of the product 100;

[0096] The transverse drive mechanism 37 is mounted on the cutting frame 35 and connected to the transverse slide 36, and is used to drive the transverse slide 36 to slide into place along the width direction of the product 100.

[0097] The lifting seat is slidably connected to the transverse sliding seat 36 in the vertical direction;

[0098] The motor 39 is connected to the lifting base;

[0099] The lifting cylinder 38 is connected to the transverse slide 36 and to the lifting seat. The lifting cylinder 38 is used to drive the lifting seat to move up and down relative to the transverse slide 36, thereby driving the motor 39 to lift.

[0100] The saw blade 40 is connected to the motor 39, which drives the saw blade 40 to rotate so that the saw blade 40 cuts the product 100 along the length direction of the product 100. Specifically, the transverse drive mechanism 37 drives the transverse slide 36 to slide along the width direction of the product 100 to adjust the position of the saw blade 40 cutting the product 100. When the lifting cylinder 38 drives the lifting seat and the motor 39 to descend to the position, the saw blade 40 can cut the product 100. When the lifting cylinder 38 drives the lifting seat and the motor 39 to rise to the position, the saw blade 40 disengages from the product 100.

[0101] Specifically, the transverse drive mechanism 37 may include a transmission screw, a transmission nut, and a handwheel; wherein, the transmission screw is rotatably connected to the cutting frame 35, the transmission nut is connected to the transverse slide 36 and cooperates with the transmission screw, and the handwheel is connected to the transmission screw and is used to drive the transmission screw to rotate, thereby driving the transverse slide 36 to move to a suitable position along the width direction of the product 100 through the transmission nut.

[0102] This embodiment also includes a trimming device 41 for trimming the product 100 on the cooling bracket 5; wherein the specific structures of the trimming device 41, the transverse cutter 34, the supporting bracket 32, and the stacking platform 33 are all prior art well known to those skilled in the art. Specifically, the trimming device 41 can be the linkage trimming device 41 disclosed in Chinese Patent No. CN216609749U, and the transverse cutter 34 can be a low-dust transverse cutter for PMMA / GPPS sheets disclosed in Chinese Patent No. CN210477079U.

[0103] In summary, the extruder 2 melts and plasticizes the material and then extrudes it into the mold 3. The material is then extruded from the mold 3 to obtain the product 100. The product 100 first passes between the middle roller 8 and the lower roller 9 and wraps around the middle roller 8, then passes between the middle roller 8 and the upper roller 7 and wraps around the upper roller 7, and then extends sequentially into the cooling bracket 5 and the traction machine 6. As is well known, the upper roller 7, middle roller 8, and lower roller 9 are all heated rollers. The temperature of the upper roller 7, middle roller 8, and lower roller 9 is heated to a temperature higher than the air temperature but lower than the temperature of the product 100, thereby reducing the temperature difference with the product 100 and allowing the product 100 to cool down slowly. After the product 100 is extruded from the mold 3, it passes directly between the middle roller 8 and the lower roller 9 and wraps around the middle roller 8. At this time, the temperature of the product 100 is the highest. The inner surface of the product 100 is in contact with the middle roller 8 and thus cools down slowly. The outer surface of the product 100 faces the heat preservation and heating device 1. The heat preservation and heating device 1 can heat and preserve the outer surface of the product 100 wrapped around the middle roller 8, thereby reducing the cooling rate of the outer surface of the product 100. This allows both surfaces of the product 100 wrapped around the middle roller 8 to cool down evenly and slowly, thus avoiding problems such as deformation and uneven thickness of the product 100. When the product 100 is wrapped around the upper roller 7, the temperature of the product 100 has already decreased, and at this time, the product 100 is less likely to deform or have uneven thickness.

[0104] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sheet metal extrusion production line, characterized in that, It includes a heat preservation and heating device (1) and an extruder (2), a die (3), a three-roll calender (4), a cooling bracket (5), and a traction machine (6) arranged in sequence; The mold (3) is connected to the extruder (2), which is used to extrude material from the mold (3) to obtain the product (100); The three-roll calender (4) has an upper roll (7), a middle roll (8) and a lower roll (9) arranged sequentially from top to bottom. The product (100) extruded from the mold (3) first passes between the middle roll (8) and the lower roll (9) and wraps around the middle roll (8), then passes between the middle roll (8) and the upper roll (7) and wraps around the upper roll (7), and then extends sequentially into the cooling bracket (5) and the traction machine (6). The cooling bracket (5) is used to support the product (100) so that the product (100) can be cooled on the cooling bracket (5); The traction machine (6) is used to pull the product (100) forward; The heat preservation and heating device (1) is connected to the three-roll calender (4). The heat preservation and heating device (1) is located on one side of the middle roll (8) and is used to heat and preserve the outer surface of the product (100) wrapped on the middle roll (8).

2. The sheet metal extrusion production line according to claim 1, characterized in that, The three-roll calender (4) includes a frame, and the heat preservation and heating device (1) is slidably connected to the frame and is used to slide toward or away from the middle roll (8) to adjust the distance between the heat preservation and heating device (1) and the middle roll (8).

3. The sheet metal extrusion production line according to claim 2, characterized in that, The heat preservation and heating device (1) is slidably connected to the frame via at least one sliding component (10); The sliding assembly (10) includes a guide post (11), a guide sleeve (12), a front stop (13), a rear stop (14), a front locking screw (15), and a rear locking screw (16); The guide post (11) is connected to the frame, the guide sleeve (12) is connected to the heat preservation and heating device (1), and the guide sleeve (12) is slidably connected to the guide post (11); The front stop (13) is slidably sleeved on the guide post (11) and is used to slide to abut against the front end of the guide sleeve (12); the rear stop (14) is slidably sleeved on the guide post (11) and is used to slide to abut against the rear end of the guide sleeve (12). The front locking screw (15) is threaded onto the front stop (13) and is used to screw it against the guide post (11) to lock the position of the front stop (13) on the guide post (11); The rear locking screw (16) is threaded onto the rear stop (14) and is used to screw it against the guide post (11) to lock the position of the rear stop (14) on the guide post (11).

4. The sheet metal extrusion production line according to claim 1, characterized in that, The heat preservation and heating device (1) includes an arc-shaped cover (17) and at least one heating tube (18); The arc-shaped cover (17) is disposed on one side of the middle roller (8), and the article (100) passes through the arc-shaped cover (17) and the middle roller (8); The heating tube (18) is connected to the arc-shaped cover (17) and is used to heat and keep warm the outer surface of the product (100) wrapped around the middle roller (8).

5. The sheet metal extrusion production line according to claim 4, characterized in that, The arc-shaped cover (17) includes a main body plate (19), a support plate (20), an upper side plate (21), a lower side plate (22), a left side plate (23), and a right side plate (24); The support plate (20) is connected to the main body plate (19), and the heating tube (18) is connected to the support plate (20). The support plate (20) and the heating tube (18) are both located on the side of the main body plate (19) facing the middle roller (8). The upper side plate (21) is connected to the upper end of the main body plate (19); The lower side plate (22) is connected to the lower end of the main body plate (19); The left side plate (23) is connected to the left end of the main body plate (19); The right side plate (24) is connected to the right end of the main body plate (19); The upper side plate (21), the left side plate (23), the lower side plate (22) and the right side plate (24) are connected end to end and surround the outside of the heating tube (18).

6. The sheet metal extrusion production line according to claim 1, characterized in that, The three-roll calender (4) includes a frame, a mounting base (25), an upper slide (26), a lower slide (27), an upper screw jack (28), and a lower screw jack (29); The mounting base (25) is connected to the frame, and the middle roller (8) is rotatably connected to the mounting base (25); The upper slide (26) is slidably connected to the frame in a vertical direction, and the upper roller (7) is rotatably connected to the upper slide (26); The lower slide block (27) is slidably connected to the frame in a vertical direction, and the lower roller (9) is rotatably connected to the lower slide block (27); The upper screw jack (28) is connected to the frame. The upper screw jack (28) is connected to the upper slide (26) and is used to drive the upper slide (26) to move, thereby driving the upper roller (7) to move to adjust the gap between the upper roller (7) and the middle roller (8). The lower screw jack (29) is connected to the frame. The lower screw jack (29) is connected to the lower slide seat (27) and is used to drive the lower slide seat (27) to move, thereby driving the lower roller (9) to move to adjust the gap between the lower roller (9) and the middle roller (8).

7. The sheet metal extrusion production line according to claim 1, characterized in that, It also includes an electrostatic eliminator (30) for eliminating static electricity on the surface of the article (100).

8. The sheet metal extrusion production line according to claim 1, characterized in that, It also includes a longitudinal cutting device (31), a support bracket (32), a stacking platform (33), and a transverse cutting machine (34); The traction machine (6), the longitudinal cutting device (31), and the support bracket (32) are arranged in sequence. After the product (100) passes through the traction machine (6), it is pulled and extended sequentially into the longitudinal cutting device (31) and onto the support bracket (32). The longitudinal cutting device (31) is used to cut the product (100) along the length direction of the product (100); The support bracket (32) is used to receive the product (100) after it has been cut by the longitudinal cutting device (31); The transverse cutting machine (34) is used to cut the product (100) on the support bracket (32) along the width direction of the product (100); The stacking platform (33) is used to receive and stack the products (100) delivered from the support bracket (32).

9. The sheet metal extrusion production line according to claim 8, characterized in that, The longitudinal cutting device (31) includes a cutting frame (35), a transverse slide (36), a transverse drive mechanism (37), a lifting seat, a lifting cylinder (38), a motor (39), and a saw blade (40); The transverse slide (36) is slidably connected to the cutting frame (35) along the width direction of the product (100); The transverse drive mechanism (37) is mounted on the cutting frame (35) and connected to the transverse slide (36) and is used to drive the transverse slide (36) to slide into place along the width direction of the product (100); The lifting seat is slidably connected to the transverse sliding seat (36) in the vertical direction; The motor (39) is connected to the lifting seat; The lifting cylinder (38) is connected to the transverse slide (36) and connected to the lifting seat. The lifting cylinder (38) is used to drive the lifting seat to move up and down relative to the transverse slide (36), thereby driving the motor (39) to lift. The saw blade (40) is connected to the motor (39), which drives the saw blade (40) to rotate so that the saw blade (40) cuts the product (100) along the length direction of the product (100).

10. The sheet metal extrusion production line according to claim 9, characterized in that, The lateral drive mechanism (37) includes a transmission screw, a transmission nut, and a handwheel; The transmission lead screw is rotatably connected to the cutting frame (35); The transmission nut is connected to the transverse slide (36) and is connected in cooperation with the transmission screw; The handwheel is connected to the transmission screw and is used to drive the transmission screw to rotate.

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