A multi-roller setting machine and plastic sheet production line

Abstract

This invention relates to the field of sheet material production technology, and more particularly to a multi-roller shaping machine and a plastic sheet production line. The multi-roller shaping machine includes a frame, a heating device, and multiple shaping mechanisms. These mechanisms are sequentially arranged on the frame along the sheet material conveying direction. The heating device is connected to each of the shaping mechanisms to heat the rollers. The surface temperature of the rollers gradually increases and then gradually decreases along the conveying direction from near to far, thereby eliminating internal stress in the sheet material through temperature changes. By preheating, shaping, and then gradually cooling the sheet material during the shaping and conveying process, new thermal stresses introduced by sudden temperature changes are avoided. Simultaneously, this controlled temperature change eliminates internal stress accumulated in the sheet material during early processing, fundamentally preventing dimensional deformation, warping, or even cracking caused by stress release during subsequent processing or use.

Description

Technical Field

[0001] This invention relates to the field of sheet metal production technology, and in particular to a multi-roller setting machine and a plastic sheet metal production line. Background Technology

[0002] During the production of plastic sheets, a thermosetting process is typically required to achieve the desired flatness, dimensional stability, and mechanical properties. The plastic sheet thermosetting machine is a key piece of equipment for this process. During thermosetting, drastic temperature changes generate significant thermal stress within the sheet. Simultaneously, forming stress accumulates within the sheet during stretching and bending. Therefore, the accumulated internal stress cannot be effectively released or eliminated. These residual internal stresses can cause dimensional deformation and cracking during subsequent processing or use, when exposed to environmental temperatures or external forces.

[0003] When faced with problems such as deformation and cracking due to excessive stress in sheet materials, especially when this stress significantly impacts the product yield, those skilled in the art generally choose to install an independent water-cooling station. Through a uniform temperature decrease, the molecular motion within the sheet material stabilizes, and the stress is gradually released. Overall, water-cooling stations are adaptable to various sheet material production lines, offer flexible setup, and effectively relieve stress. They are considered a mature and reliable conventional method and the preferred choice in plastic sheet material production lines. Currently, this method performs well in actual production and meets stress control requirements in most scenarios. Therefore, those skilled in the art generally lack the technical motivation to explore or improve alternative solutions. However, water-cooling stress relief still has some drawbacks, such as the need for spraying equipment and water tanks, and the potential for water stains on the product.

[0004] Of course, an independent annealing station can also be set up in the production line, but the biggest drawback of this method is that it takes a long time and occupies a lot of space, which is why water cooling is more commonly chosen. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a multi-roller setting machine, which provides a new way to solve the problem of quality defects in the board material caused by internal stress after setting. At the same time, it occupies less space than water cooling and annealing methods, does not leave water stains on the board surface compared to water cooling, and saves time compared to annealing.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] This invention provides a multi-roller shaping machine, including a frame, a heating device mounted on the frame, and multiple shaping mechanisms. The multiple shaping mechanisms are sequentially arranged on the frame along the sheet material conveying direction. The heating device is connected to the multiple shaping mechanisms respectively and is used to heat the rollers of the shaping mechanisms. The surface temperature of the rollers of the multiple shaping mechanisms gradually increases from the near end to the far end along the conveying direction and then gradually decreases, so as to eliminate the internal stress of the sheet material through temperature change.

[0010] Preferably, the center lines of the shaping spaces of the multiple shaping mechanisms are arranged alternately from the near end to the far end, and the degree of alternation gradually decreases along the conveying direction of the sheet material.

[0011] Preferably, the shaping mechanism includes an upper roller and a lower roller; the upper roller and the lower roller are arranged opposite each other, and the upper roller and the lower roller cooperate to convey the sheet material, and the space in which the two cooperate to convey the sheet material is the shaping space; the heating device is used to heat the upper roller and the lower roller of the shaping mechanism.

[0012] Preferably, the heating device includes multiple independent heating units; the multiple heating units are arranged one-to-one with multiple shaping mechanisms; each heating unit includes a heating host, an outlet pipe, an inlet pipe, and a connecting pipe; the outlet of the heating host is connected to the inlet of the upper roller through the outlet pipe; the outlet of the upper roller is connected to the inlet of the lower roller through the connecting pipe; the outlet of the lower roller is connected to the inlet of the heating host through the inlet pipe; the heating fluid flowing through the upper and lower rollers exchanges heat with the plate through the roller body.

[0013] Preferably, the highest temperature range of the roller surface of the shaping mechanism among the multiple shaping mechanisms is 90℃-170℃.

[0014] Preferably, the main heating unit among the multiple heating devices is an oil temperature controller or a water mold temperature controller.

[0015] Preferably, the shaping mechanism further includes a lifting unit; the movable end of the lifting unit is connected to the upper roller and is used to drive the upper roller to move up and down to adjust the distance between the upper roller and the lower roller.

[0016] Preferably, the lifting unit is configured to adjust the pressure applied to the sheet material by the upper roller in the shaping mechanism, with the pressure ranging from 0.4 MPa to 0.8 MPa.

[0017] The present invention also provides a plastic sheet production line, including a calender and the aforementioned multi-roller shaping machine; the multi-roller shaping machine is located downstream of the calender and is used to shape the sheet after it has been coated with film at a fixed thickness by the calender.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this invention are:

[0020] This invention discloses a multi-roller shaping machine, comprising a frame, a heating device, and multiple shaping mechanisms. The shaping mechanisms are sequentially arranged on the frame along the sheet material conveying direction. The heating device is connected to each shaping mechanism to heat the rollers of the shaping mechanisms. The surface temperature of the rollers of the multiple shaping mechanisms gradually increases from the near end to the far end along the conveying direction and then gradually decreases, thereby eliminating internal stress in the sheet material through temperature changes. By preheating, shaping, and then gradually cooling the sheet material during the shaping and conveying process, new thermal stresses introduced at the shaping station due to sudden temperature changes are avoided. Simultaneously, this controlled temperature gradient change eliminates internal stress accumulated in the sheet material during earlier processing, fundamentally preventing dimensional deformation, warping, or even cracking caused by stress release during subsequent processing or use, thus significantly improving the production quality and service life of the sheet material. Furthermore, the process integrates methods to suppress the generation of "new stress" while eliminating "old stress," requiring the addition of a new stress-relief station on the conveyor line. This eliminates the need for intermediate transfers or additional stress-relief processes (such as water cooling or annealing stations), significantly improving production efficiency and saving production time and space costs. Clearly, there are no water stain issues caused by water cooling.

[0021] This invention provides a plastic sheet production line. Because the production line includes a multi-roller setting machine, the sheet is preheated, then set, and finally gradually cooled during the setting and conveying process. This avoids the introduction of new thermal stress due to sudden temperature changes at the setting station. Simultaneously, this controlled temperature gradient eliminates internal stress accumulated in the sheet during earlier processing, fundamentally preventing dimensional deformation, warping, and even cracking caused by stress release during subsequent processing or use. This significantly improves the production quality and service life of the sheet. Furthermore, the setting process integrates methods to suppress the generation of "new stress" while eliminating "old stress," requiring only an additional stress-relief station on the conveyor line. This eliminates the need for intermediate transfers or additional stress-relief processes (such as water cooling or annealing stations), greatly improving production efficiency and saving production time and space costs. Obviously, the water stain problem caused by water cooling is also eliminated. Attached Figure Description

[0022] Figure 1 This is a front view of a multi-roller setting machine according to the present invention;

[0023] Figure 2 This is a first-view structural schematic diagram of a multi-roller setting machine;

[0024] Figure 3 This is a structural schematic diagram of a multi-roller setting machine from a second perspective.

[0025] Figure 4 This is a schematic diagram of the shaping mechanism;

[0026] Figure 5 for Figure 4 A longitudinal sectional view.

[0027] [Explanation of Labels in the Attached Image]

[0028] 1: Shaping mechanism; 11: Lifting unit; 12: Upper roller; 13: Lower roller; 2: Heating device; 21: Water outlet pipe; 22: Water inlet pipe; 23: Connecting pipe; 3: Frame; 4: Drive mechanism. Detailed Implementation

[0029] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should be noted that the terms "proximal end" and "distal end" in the specification and claims of this invention are relative to the direction of entry of the plastic sheet. The end into which the sheet first enters is the proximal end, and the end out which last exits is the distal end.

[0031] Example 1:

[0032] like Figures 1-3 As shown, this embodiment of the invention provides a multi-roller shaping machine, which includes a frame 3, a drive mechanism 4, a heating device 2 mounted on the frame 3, and multiple shaping mechanisms 1. The multiple shaping mechanisms 1 are sequentially arranged on the frame 3 along the sheet material conveying direction, forming a continuous sheet material shaping and conveying path. The heating device 2 is connected to each of the multiple shaping mechanisms 1 and is used to independently heat the rollers of the shaping mechanisms 1. The surface temperature of the rollers of the multiple shaping mechanisms 1 gradually increases and then gradually decreases along the conveying direction from the near end to the far end, so as to eliminate the internal stress of the sheet material through temperature gradient changes. Here, "near end along the conveying direction" refers to the end that the sheet material passes through first during conveying, and conversely, "far end along the conveying direction" refers to the end that the sheet material passes through last.

[0033] By independently controlling the temperature of multiple shaping mechanisms 1, the sheet material is preheated, shaped, and then gradually cooled during the shaping and conveying process. This avoids the introduction of new thermal stress due to sudden temperature changes at the shaping station. Simultaneously, this controlled temperature gradient eliminates internal stress accumulated in the sheet material during earlier processing, fundamentally preventing dimensional deformation, warping, and even cracking caused by stress release during subsequent processing or use. This significantly improves the production quality and service life of the sheet material. Furthermore, the shaping process integrates methods to suppress the generation of "new stress" while eliminating "old stress," requiring the addition of a new stress-relief station on the conveyor line. This eliminates the need for intermediate transfers or additional stress-relief processes (such as water cooling or annealing stations), greatly improving production efficiency and saving production time and space costs. Obviously, there are no water stain problems caused by water cooling. The multi-roller shaping machine in this embodiment is particularly suitable for shaping thermoplastic sheets such as PVC, PC, PET, and PP, and has the best stress relief effect for medium-thick sheets with a thickness range of 3mm-15mm.

[0034] In this embodiment, the center lines of the shaping spaces of the multiple shaping mechanisms 1 are arranged vertically and vertically from the near end to the far end along the conveying direction, and the degree of staggering gradually decreases along the conveying direction of the sheet material.

[0035] Each shaping mechanism 1 includes an upper roller 12, a lower roller 13, and a lifting unit 11. The upper roller 12 and lower roller 13 are arranged vertically opposite each other, and they work together to convey the sheet material. The space in which they work together to convey the sheet material is the shaping space. The fixed end of the lifting unit 11 is connected to the frame 3, and the moving end of the lifting unit 11 is connected to the upper roller 12, used to drive the upper roller 12 to move up and down to adjust the distance between the upper roller 12 and the lower roller 13. The drive mechanism 4 is used to drive the lower roller 13 in the shaping mechanism 1 to rotate, and the heating device 2 is used to heat the upper roller 12 and the lower roller 13 in the shaping mechanism 1. The lifting unit 11 can be a cylinder or an electric servo mechanism, which can adjust the pressure of the upper roller 12 on the sheet material. The preferred linear pressure range is 0.4MPa-0.8MPa to balance the clamping force and avoid excessive compression.

[0036] To achieve the aforementioned staggered path, in this embodiment, the installation height of the lower roller 13 in the shaping mechanism 1 is not on the same horizontal line, but rather distributed in a wave-like pattern, with the staggered amplitude decreasing along the conveying direction, allowing the sheet material to undergo controllable, alternating, minute bending deformations during its forward movement. The installation height of the lower roller 13 is adjusted by the adjustable support on the frame 3.

[0037] Specifically, along the conveying direction, the staggered distance between the first and second shaping mechanisms 1 is greater than the staggered distance between the second and third shaping mechanisms 1, and the staggered distance between the second and third shaping mechanisms 1 is greater than the staggered distance between the third and fourth shaping mechanisms 1, and so on. Therefore, the staggered distance between the first and second shaping mechanisms 1 is the maximum value on the conveying path, and the staggered distance between the last two shaping mechanisms 1 is the minimum value on the conveying path. The initial near-end staggered amplitude is set to 3mm-5mm, meaning the vertical distance between the center lines of the shaping spaces of the two closest shaping mechanisms 1 is 3mm-5mm; the final far-end staggered amplitude is reduced to 0.1mm-0.5mm, meaning the vertical distance between the center lines of the shaping spaces of the two farthest shaping mechanisms 1 is 0.1mm-0.5mm. This design ensures effective stress release while avoiding surface scratches or structural damage to the sheet material caused by excessive bending.

[0038] In this embodiment, a total of 12 sets of shaping mechanisms 1 are provided. The height difference between the center lines of the shaping spaces of the first and second shaping mechanisms 1 along the sheet material conveying direction is 4mm; the height difference between the center lines of the shaping spaces of the second and third shaping mechanisms 1 is 3.6mm; the height difference between the center lines of the shaping spaces of the third and fourth shaping mechanisms 1 is 3.2mm; the height difference between the center lines of the shaping spaces of the fourth and fifth shaping mechanisms 1 is 2.8mm; the height difference between the center lines of the shaping spaces of the fifth and sixth shaping mechanisms 1 is 2.4mm; and the height difference between the center lines of the sixth shaping mechanism... The height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 7 is 2 mm; the height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 8 is 1.6 mm; the height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 9 is 1.2 mm; the height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 10 is 0.8 mm; the height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 11 is 0.4 mm; and the height difference between the center lines of the shaping spaces of shaping mechanisms 1 and 12 is 0.2 mm.

[0039] Among them, the vertical height difference of the center line of the shaping space of the two adjacent shaping mechanisms 1 is smaller than the height difference of the shaping space of the two adjacent shaping mechanisms 1 in the front direction along the conveying direction.

[0040] The centerline of the shaping space refers to the midpoint of the line connecting the lowest point of the upper roller 12 and the highest point of the lower roller 13. The stagger is defined as the vertical distance difference between the horizontal centerlines of adjacent shaping mechanisms 1. It should be noted that during installation, the axes of rotation of the upper roller 12 and the lower roller 13 in the shaping mechanism 1 are arranged perpendicularly. The upper roller 12 and the lower roller 13 in the shaping mechanism 1 have the same diameter, preferably 200mm-250mm, to ensure rigidity while providing sufficient heating area. The roller surfaces of the upper roller 12 and the lower roller 13 are treated with hard chrome plating, with a plating thickness of 0.05mm-0.1mm and a surface roughness Ra≤0.2μm. This enhances the wear resistance of the roller surface and reduces frictional damage to the sheet material surface, ensuring a smooth product surface.

[0041] Under the influence of the temperature field, the sheet material is in a softened or highly elastic state. Applying alternating bending stress with decreasing amplitude at this time can more effectively release the stress generated inside the sheet material due to previous stretching, rolling, and other processes. The larger alternation amplitude near the end, at a higher temperature, can more effectively break the initial equilibrium state of internal stress. As the sheet material is transported forward, after the stress is fully released, it can slowly cool and solidify in a gradually leveling mechanical state, improving the effect of eliminating internal stress.

[0042] Along the conveying direction, the multiple shaping mechanisms 1 can be sequentially divided into a preheating zone, a shaping zone, and a slow cooling zone. The surface temperature of the rollers of the multiple shaping mechanisms 1 generally shows a trend of first increasing and then decreasing. The control temperature of the shaping zone is higher than that of the preheating zone and the slow cooling zone. The temperature range of the preheating zone is 75℃-100℃. The highest surface temperature range of the rollers of the shaping mechanism 1 in the shaping zone is 90℃-170℃. The specific temperature is adjusted according to the material of the sheet. The temperature range of the slow cooling zone is 70℃-80℃. For PVC sheets, the preferred preheating zone temperature is 85℃-95℃, the preferred setting zone temperature is 100℃-120℃, and the preferred slow cooling zone temperature is 75℃-80℃; for PP sheets, the preferred preheating zone temperature is 75℃-100℃, the preferred setting zone temperature is 90℃-130℃, and the preferred slow cooling zone temperature is 70℃-75℃. Temperature control adopts PID regulation, and the temperature fluctuation range of the roller surface is ≤±2℃ to ensure the stability of the temperature gradient.

[0043] In this embodiment, a total of 12 shaping mechanisms 1 are provided. The preheating zone includes the first and second shaping mechanisms 1. The heating temperature of the first shaping mechanism 1 is not higher than that of the second shaping mechanism 1, which can uniformly heat the board to the process start temperature. The shaping zone includes the third to the eighth groups, a total of 6 shaping mechanisms 1. This area is the core area for eliminating internal stress and maintains the highest process temperature. The temperature of the 6 shaping mechanisms 1 in the shaping zone can present a fine gradient along the conveying direction, first rising slightly and then slowly decreasing, or adjacent shaping mechanisms 1 can maintain the same temperature. The core requirement is to maintain the overall temperature trend of "rising first and then falling" in the preheating zone, shaping zone, and slow cooling zone to ensure that the stress release process is stable and controllable. The slow cooling zone includes the ninth to the twelfth groups, a total of 4 shaping mechanisms 1. The temperature of the 4 shaping mechanisms 1 is controlled such that the temperature of the rear shaping mechanism 1 is not higher than that of the front shaping mechanism 1, which can allow the board to cool down slowly from the high process temperature and complete the curing.

[0044] In this embodiment, the temperatures of the upper rollers 12 of the first shaping mechanism 1 along the conveying direction are 80°C, 90°C, 100°C, 110°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C, 100°C, 90°C, 90°C, 80°C, and 80°C.

[0045] The spacing between each shaping mechanism 1 is 300mm-500mm, and the total layout length of the 12 mechanisms is 4m-5m, which is suitable for the layout requirements of conventional plastic sheet production lines. The number of shaping mechanisms 1 can be flexibly adjusted according to the sheet thickness and production speed. For example, for thin sheets with a thickness of ≤5mm, 8 shaping mechanisms 1 can be set up (2 preheating zones, 4 shaping zones, and 2 slow cooling zones). For thick sheets with a thickness of ≥15mm, it can be expanded to 16 shaping mechanisms 1 (3 preheating zones, 8 shaping zones, and 5 slow cooling zones) to ensure that sheets of different specifications can obtain sufficient temperature treatment and stress release time.

[0046] Preferably, in the preheating zone, among two adjacent groups of shaping mechanisms 1, the temperature of the rear shaping mechanism 1 is greater than or equal to the temperature of the front shaping mechanism 1. In the shaping zone, the temperature of one or more adjacent groups of shaping mechanisms 1 is the highest temperature. Along the sheet material conveying direction, the shaping mechanism 1 located in front of the shaping mechanism 1 with the highest temperature generally shows an upward trend (it is allowed that some adjacent groups of shaping mechanisms 1 have the same temperature), and the shaping mechanism 1 located behind the shaping mechanism 1 with the highest temperature generally shows a downward trend (it is allowed that some adjacent groups of shaping mechanisms 1 have the same temperature).

[0047] Preferably, the temperature gradient between two adjacent sets of shaping mechanisms 1 in the preheating zone is 0℃-20℃, the temperature gradient between two adjacent sets of shaping mechanisms 1 in the shaping zone is 0℃-10℃, and the temperature gradient between two adjacent sets of shaping mechanisms 1 in the slow cooling zone is 0℃-10℃.

[0048] The multi-roller stenter in this embodiment, through its compact and reasonable layout, can be integrated onto a single frame 3. Furthermore, the overall size of the machine is adapted to container loading requirements, enabling it to be transported as a complete unit, making it particularly suitable for export scenarios. This embodiment uses a 20GP container for transport, significantly reducing the required container size and lowering both space occupancy and logistics costs per shipment.

[0049] like Figure 4 and Figure 5 As shown, the heating device 2 includes multiple independent heating units, each corresponding to one of the multiple shaping mechanisms 1. Each heating unit includes a heating host, a water outlet pipe 21, a water inlet pipe 22, and a connecting pipe 23. The heating host of the multiple heating units is covered above the frame 3 by a cover. The water outlet of the heating host is connected to the water inlet of the upper roller 12 through the water outlet pipe 21. The water outlet of the upper roller 12 is connected to the water inlet of the lower roller 13 through the connecting pipe 23. The water outlet of the lower roller 13 is connected to the water inlet of the heating host through the water inlet pipe 22. The heating fluid flowing through the upper roller 12 and the lower roller 13 exchanges heat with the material through the roller body. The internal heating method ensures that the temperature is uniform throughout the roller surface. It should be noted that the two ends of the roller body are connected to the pipeline with rotary joints to ensure that there is no leakage of the heating fluid.

[0050] Based on the different temperature requirements, the heating host set for the preheating zone and the shaping zone is an oil temperature controller, while the heating host set for the slow cooling zone is a water mold temperature controller.

[0051] To ensure the accurate and stable temperature gradient in each region, this embodiment adopts the temperature feedback and closed-loop control mechanism in the prior art. Each shaping mechanism 1 includes a temperature sensor to collect the actual temperature of the roller surface in real time and feed it back to the corresponding oil temperature controller / water mold temperature controller control system. The control system has a built-in PID adjustment algorithm to compare the feedback temperature with the preset process temperature in real time and automatically adjust the heating power of the heating host or the circulation flow rate of the heat transfer medium.

[0052] Example 2:

[0053] This embodiment provides a plastic sheet production line, which includes a calender and the aforementioned multi-roller shaping machine. The multi-roller shaping machine is located downstream of the calender and is used to shape the sheet after it has been coated with film at a fixed thickness by the calender.

[0054] Because the plastic sheet production line includes a multi-roller setting machine, the sheets are preheated, set, and then gradually cooled during the setting and conveying process. This avoids introducing new thermal stress at the setting station due to sudden temperature changes. Simultaneously, this controlled temperature gradient eliminates internal stress accumulated in the sheet during earlier processing, fundamentally preventing dimensional deformation, warping, and even cracking caused by stress release during subsequent processing or use. This significantly improves the production quality and service life of the sheets. Furthermore, the setting process integrates methods to suppress the generation of "new stress" while eliminating "old stress," requiring only an additional stress-relief station on the conveyor line. This eliminates the need for intermediate transfers or additional stress-relief processes (such as water cooling or annealing stations), greatly improving production efficiency and saving production time and space costs. Clearly, there are no water stain problems caused by water cooling.

[0055] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-roller setting machine, characterized in that, It includes a frame (3), a heating device (2) mounted on the frame (3), and multiple shaping mechanisms (1); Multiple shaping mechanisms (1) are sequentially arranged on the frame (3) along the sheet material conveying direction; The heating device (2) is connected to a plurality of the shaping mechanisms (1) respectively, and is used to heat the rollers of the shaping mechanism (1); The surface temperature of the rollers of the multiple shaping mechanisms (1) gradually increases from the near end to the far end along the conveying direction and then gradually decreases, so as to eliminate the internal stress of the plate through temperature change. The center lines of the shaping spaces of the multiple shaping mechanisms (1) are arranged alternately from the near end to the far end, and the degree of alternation gradually decreases along the conveying direction of the sheet material; The shaping mechanism (1) includes an upper roller (12) and a lower roller (13). The upper roller (12) and the lower roller (13) are arranged opposite each other, and the upper roller (12) and the lower roller (13) cooperate to transport the plate, and the space in which the two cooperate to transport the plate is the shaping space.

2. The multi-roller setting machine as described in claim 1, characterized in that: The heating device (2) is used to heat the upper roller (12) and lower roller (13) of the shaping mechanism (1).

3. The multi-roller setting machine as described in claim 2, characterized in that: The heating device (2) includes multiple independent heating units; Each of the heating units is provided in a one-to-one correspondence with one of the shaping mechanisms (1); Each of the heating units includes a heating host, a water outlet pipe (21), a water inlet pipe (22), and a connecting pipe (23); The outlet of the heating host is connected to the inlet of the upper roller (12) through the outlet pipe (21); The outlet of the upper roller (12) is connected to the inlet of the lower roller (13) through the connecting pipe (23); The outlet of the lower roller (13) is connected to the inlet of the heating host through the inlet pipe (22); The heated fluid flowing through the upper roller (12) and the lower roller (13) exchanges heat with the plate through the roller body.

4. The multi-roller setting machine as described in claim 3, characterized in that: The maximum temperature range of the roller surface of the shaping mechanism (1) among the multiple shaping mechanisms (1) is 90℃-170℃.

5. The multi-roller setting machine as described in claim 4, characterized in that: The heating host in the multiple heating devices (2) is an oil temperature controller or a water temperature controller.

6. The multi-roller setting machine as described in claim 2, characterized in that: The shaping mechanism (1) also includes a lifting unit (11); The movable end of the lifting unit (11) is connected to the upper roller (12) and is used to drive the upper roller (12) to move up and down to adjust the distance between the upper roller (12) and the lower roller (13).

7. The multi-roller setting machine as described in claim 6, characterized in that: The lifting unit (11) is configured to adjust the pressure applied to the sheet material by the upper roller (12) in the shaping mechanism (1), the pressure being in the range of 0.4MPa-0.8MPa.

8. A plastic sheet production line, characterized in that: Includes a calender and a multi-roller setting machine as described in any one of claims 1-7; The multi-roller shaping machine is located downstream of the calender and is used to shape the sheet material after it has been coated with film at a fixed thickness by the calender.

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