Multi-roller setting machine and plastic plate production line

Abstract

The invention relates to the technical field of plate production, in particular to a multi-roller setting machine and a plastic plate production line. The multi-roller setting machine comprises a rack, a heating device and a plurality of setting mechanisms, the multiple setting mechanisms are sequentially arranged on the rack in the plate conveying direction, and the heating device is connected with the multiple setting mechanisms and used for heating roller bodies of the setting mechanisms. And the surface temperatures of the roller bodies of the shaping mechanisms are gradually increased from the near end to the far end in the conveying direction and then are gradually reduced, so that the internal stress of the plate is eliminated through temperature change. The plate is preheated, then shaped and finally gradually cooled in the shaping and conveying process, so that new thermal stress caused by sudden temperature change is avoided, meanwhile, the internal stress accumulated in early-stage machining of the plate can be eliminated through the controlled temperature change, and the machining quality of the plate is improved. And the problems of size deformation, warping, even cracking and the like caused by stress release in the subsequent processing or using process of the product are fundamentally and effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plate production, in particular to a multi-roller shaping machine and a plastic plate production line. BACKGROUND

[0002] In the production process of plastic plates, a heat setting process is usually needed to obtain the required flatness, dimensional stability and mechanical properties. The plastic plate setting machine is the key equipment for implementing this process. During the setting process of the plastic plate, the sudden temperature change will cause a huge thermal stress in the plate. At the same time, during the stretching and bending forming process, the plate will also accumulate forming stress. Therefore, the internal stress accumulated in the plate cannot be effectively released and eliminated. These residual internal stresses will cause the plate to deform in size, crack, etc. when affected by the ambient temperature or external force during subsequent processing or use.

[0003] When the plate stress is too large and causes deformation and cracking, etc., the person skilled in the art generally chooses to set up an independent water cooling station to gradually release the stress by uniformly reducing the temperature and stabilizing the movement of the plate molecules. Overall, the water cooling station is suitable for various plate production lines, is flexible to set up, can achieve stress relief, and has been considered by the person skilled in the art as a mature and reliable conventional means as the first choice in the plastic plate production line. At present, this method performs well in actual production and can meet the stress control needs in most scenarios, so the person skilled in the art generally lacks the technical motivation to explore or improve alternative solutions. However, the water cooling stress relief method still has some defects, such as the need for spraying, water tank and other equipment, and the possibility of water stains on the product.

[0004] Of course, the person skilled in the art can also set up an independent annealing station in the production line, but the biggest disadvantage of this method is that the processing time is long and the space occupied is large, which is also the reason why the water cooling method is more commonly chosen. SUMMARY

[0005] (I) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a multi-roller shaping machine, which provides a new way to solve the problem of plate quality defects caused by internal stress after shaping, and at the same time, compared with the water cooling and annealing methods, it occupies less space, compared with the water cooling method, the plate surface will not have water stains, and compared with the annealing method, it saves time.

[0007] (II) Technical solutions

[0008] In order to achieve the above-mentioned purposes, the main technical solutions adopted by the present application include:

[0009] The embodiment of the present application provides a multi-roller shaping machine, which comprises a rack, a heating device arranged on the rack and a plurality of shaping mechanisms; the plurality of shaping mechanisms are sequentially arranged on the rack along a plate conveying direction; the heating device is connected with the plurality of shaping mechanisms respectively and used for heating roller bodies of the shaping mechanisms; the surface temperature of the roller bodies of the plurality of shaping mechanisms gradually increases from a proximal end to a distal end along the conveying direction and then gradually decreases, so that the internal stress of the plate is eliminated through the temperature change.

[0010] Preferably, the center lines of the shaping spaces of the plurality of shaping mechanisms are staggered up and down from the proximal end to the distal end, and the staggered amplitude gradually decreases along the plate conveying direction.

[0011] Preferably, the shaping mechanism comprises an upper roller and a lower roller; the upper roller and the lower roller are arranged oppositely up and down; the upper roller and the lower roller are used for conveying the plate in cooperation, and the space used for conveying the plate in cooperation is the shaping space; and the heating device is used for heating the upper roller and the lower roller of the shaping mechanism.

[0012] Preferably, the heating device comprises a plurality of independent heating units; the plurality of heating units are arranged in one-to-one correspondence with the plurality of shaping mechanisms; each heating unit comprises a heating host, a water outlet pipe, a water inlet pipe and a connecting pipe; the water outlet of the heating host is communicated with the water inlet of the upper roller through the water outlet pipe; the water outlet of the upper roller is communicated with the water inlet of the lower roller through the connecting pipe; the water outlet of the lower roller is communicated with the water inlet of the heating host through the water inlet pipe; and the heating fluid flowing in the upper roller and the lower roller exchanges heat with the plate through the roller bodies.

[0013] Preferably, the surface highest temperature range of the roller body of the shaping mechanism in the plurality of shaping mechanisms is 90-170 DEG C.

[0014] Preferably, the heating host in the plurality of heating devices is an oil temperature machine or a water temperature machine.

[0015] Preferably, the shaping mechanism further comprises a lifting unit; the moving end of the lifting unit is connected with the upper roller and used for driving 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 by the upper roller in the shaping mechanism to the plate, and the pressure range is 0.4-0.8 MPa.

[0017] The present application also provides a plastic plate production line, which comprises a calender and the above-mentioned multi-roller shaping machine; the multi-roller shaping machine is arranged downstream of the calender and used for shaping the plate after the thickness of the plate is fixed and the film is pasted through the calender.

[0018] (Three) beneficial effects

[0019] The beneficial effects of the present application are:

[0020] The application discloses a multi-roller shaping machine, which comprises a rack, a heating device and a plurality of shaping mechanisms, the plurality of shaping mechanisms are sequentially arranged on the rack along a plate conveying direction, the heating device is connected with the plurality of shaping mechanisms respectively and used for heating roller bodies of the shaping mechanisms, and the roller body surface temperature of the plurality of shaping mechanisms gradually increases from the proximal end to the distal end along the conveying direction and then gradually decreases, so that the internal stress of the plate is eliminated through the temperature change. The plate is preheated first and then shaped and finally gradually cooled in the shaping conveying process, so that the new thermal stress caused by the sudden change of the temperature in the shaping station is avoided, and the internal stress accumulated in the previous processing of the plate is eliminated through the controlled temperature gradient change, so that the problems of the size deformation, warping and even cracking of the product caused by the stress release in the subsequent processing or use process are fundamentally and effectively prevented, and the production quality and service life of the plate are greatly improved. Moreover, the method of eliminating the new stress and the old stress is integrated in the shaping process, and a new stress relieving station needs to be additionally arranged on the conveying line, that is, the intermediate transfer or the additional stress relieving process (such as the water cooling station or the annealing station) is not needed, the production efficiency is greatly improved, the production time and the site cost are saved. Obviously, the water stain problem caused by the water cooling method does not exist.

[0021] The application discloses a plastic plate production line, which comprises a multi-roller shaping machine. The plate is preheated first and then shaped and finally gradually cooled in the shaping conveying process, so that the new thermal stress caused by the sudden change of the temperature in the shaping station is avoided, and the internal stress accumulated in the previous processing of the plate is eliminated through the controlled temperature gradient change, so that the problems of the size deformation, warping and even cracking of the product caused by the stress release in the subsequent processing or use process are fundamentally and effectively prevented, and the production quality and service life of the plate are greatly improved. Moreover, the method of eliminating the new stress and the old stress is integrated in the shaping process, and a new stress relieving station needs to be additionally arranged on the conveying line, that is, the intermediate transfer or the additional stress relieving process (such as the water cooling station or the annealing station) is not needed, the production efficiency is greatly improved, the production time and the site cost are saved. Obviously, the water stain problem caused by the water cooling method does not exist. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view of a multi-roller shaping machine of the application;

[0023] Figure 2 It is a structural schematic view of a first perspective of a multi-roller shaping machine;

[0024] Figure 3 It is a structural schematic view of a second perspective of a multi-roller shaping machine;

[0025] Figure 4 It is a structural schematic view of a shaping mechanism;

[0026] Figure 5 For Figure 4 a longitudinal sectional view.

[0027]

Explanation of reference signs

[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: rack; 4: driving mechanism. DETAILED DESCRIPTION

[0029] In order to better explain the present application, so as to be understood, the present application is described in detail below by specific embodiments, combined with the drawings.

[0030] It should be noted that the terms "proximal end" and "distal end" in the specification and claims of the present application are relative to the entering direction of the plastic plate, the end first entering is the proximal end, and the end last leaving is the distal end.

[0031] Example one:

[0032] As Figures 1-3 shown, the embodiment of the present application provides a multi-roller shaping machine, which comprises a rack 3, a driving mechanism 4, a heating device 2 arranged on the rack 3, and a plurality of shaping mechanisms 1. The plurality of shaping mechanisms 1 are arranged on the rack 3 in sequence along the plate conveying direction, and together constitute a continuous plate shaping conveying path. The heating device 2 is connected with the plurality of shaping mechanisms 1 respectively, and is used for independently heating the roller bodies of the shaping mechanisms 1. The surface temperature of the roller bodies of the plurality of shaping mechanisms 1 gradually increases from the proximal end to the distal end along the conveying direction and then gradually decreases, so as to eliminate the internal stress of the plate by the temperature gradient change. Wherein, the "proximal end along the conveying direction" refers to the end first passed when the plate is conveyed, and vice versa, the "distal end along the conveying direction" refers to the end last passed.

[0033] The plate is preheated, shaped and gradually cooled in the shaping conveying process through independent temperature control of the plurality of shaping mechanisms 1, thereby avoiding the introduction of new thermal stress due to sudden temperature change in the shaping station, and the controlled temperature gradient change can also eliminate the internal stress accumulated in the previous processing, thereby fundamentally preventing the dimensional deformation, warping and even cracking of the product due to stress release in the subsequent processing or use process, and further greatly improving the production quality and service life of the plate. Moreover, the method of suppressing the generation of "new stress" while eliminating "old stress" is integrated in the shaping process, and an additional stress relief station needs to be added on the conveying line, i.e. without intermediate transfer or additional stress relief process (such as water cooling station or annealing station), which greatly improves the production efficiency, saves production time and site cost. Obviously, there is no water stain problem caused by water cooling. The multi-roller shaping machine in the embodiment is especially suitable for shaping processing of PVC, PC, PET, PP and other thermoplastic plastic plates, and has the optimal stress relief effect for medium-thick plates with a thickness range of 3mm-15mm.

[0034] In the embodiment, the center lines of the shaping spaces of the plurality of shaping mechanisms 1 are staggered up and down along the conveying direction from the proximal end to the distal end, and the staggered amplitude gradually decreases along the plate conveying direction.

[0035] Each shaping mechanism 1 includes an upper roller 12, a lower roller 13 and a lifting unit 11. The upper roller 12 and the lower roller 13 are arranged oppositely up and down, and cooperate to convey the plate. The space for conveying the plate is the shaping space. The fixed end of the lifting unit 11 is connected with the rack 3, and the moving end of the lifting unit 11 is connected with the upper roller 12, for driving the upper roller 12 to move up and down to adjust the distance between the upper roller 12 and the lower roller 13. The driving 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 pneumatic cylinder or an electric servo mechanism, which can adjust the pressure of the upper roller 12 on the plate, and the linear pressure range is preferably 0.4MPa-0.8MPa, to balance the clamping force and avoid excessive extrusion.

[0036] In order to realize the staggered path, the mounting height of the lower roller 13 in the shaping mechanism 1 is not on the same horizontal line, but is in a wave shape distribution, and the staggered amplitude decreases along the conveying direction, so that the plate can be subjected to controllable and alternating slight bending deformation in the advancing process. The mounting height of the lower roller 13 is adjusted by the adjustable support on the rack 3.

[0037] Specifically, along the conveying direction, the staggered distance of the first set of shaping mechanisms 1 and the second set of shaping mechanisms 1 is greater than the staggered distance of the second set of shaping mechanisms 1 and the third set of shaping mechanisms 1, the staggered distance of the second set of shaping mechanisms 1 and the third set of shaping mechanisms 1 is greater than the staggered distance of the third set of shaping mechanisms 1 and the fourth set of shaping mechanisms 1, and so on. In this way, the staggered distance of the first set of shaping mechanisms 1 and the second set of shaping mechanisms 1 is the maximum value on the conveying path, and the staggered distance of the last two sets of shaping mechanisms 1 is the minimum value on the conveying path. The initial proximal staggered amplitude is set to 3mm-5mm, that is, the distance in the vertical direction of the center lines of the shaping spaces of the two nearest sets of shaping mechanisms 1 is 3mm-5mm; the distal final staggered amplitude is reduced to 0.1mm-0.5mm, that is, the distance in the vertical direction of the center lines of the shaping spaces of the two most distal sets of shaping mechanisms 1 is 0.1mm-0.5mm, which not only ensures the effectiveness of stress release, but also avoids surface scratching or structural damage of the plate caused by excessive bending.

[0038] In the present embodiment, there are 12 sets of shaping mechanisms 1, and the height difference of the center lines of the shaping spaces of the first set of shaping mechanisms 1 and the second set of shaping mechanisms 1 along the plate conveying direction is 4mm, the height difference of the center lines of the shaping spaces of the second set of shaping mechanisms 1 and the third set of shaping mechanisms 1 is 3.6mm, the height difference of the center lines of the shaping spaces of the third set of shaping mechanisms 1 and the fourth set of shaping mechanisms 1 is 3.2mm, the height difference of the center lines of the shaping spaces of the fourth set of shaping mechanisms 1 and the fifth set of shaping mechanisms 1 is 2.8mm, the height difference of the center lines of the shaping spaces of the fifth set of shaping mechanisms 1 and the sixth set of shaping mechanisms 1 is 2.4mm, the height difference of the center lines of the shaping spaces of the sixth set of shaping mechanisms 1 and the seventh set of shaping mechanisms 1 is 2mm, the height difference of the center lines of the shaping spaces of the seventh set of shaping mechanisms 1 and the eighth set of shaping mechanisms 1 is 1.6mm, the height difference of the center lines of the shaping spaces of the eighth set of shaping mechanisms 1 and the ninth set of shaping mechanisms 1 is 1.2mm, the height difference of the center lines of the shaping spaces of the ninth set of shaping mechanisms 1 and the tenth set of shaping mechanisms 1 is 0.8mm, the height difference of the center lines of the shaping spaces of the tenth set of shaping mechanisms 1 and the eleventh set of shaping mechanisms 1 is 0.4mm, and the height difference of the center lines of the shaping spaces of the eleventh set of shaping mechanisms 1 and the twelfth set of shaping mechanisms 1 is 0.2mm.

[0039] Among them, the height difference of the center lines of the shaping spaces of the adjacent two sets of shaping mechanisms 1 in the vertical direction, along the conveying direction, the height difference of the shaping spaces of the latter two adjacent sets of shaping mechanisms 1 is less than the height difference of the shaping spaces of the former two sets of shaping mechanisms 1.

[0040] The center line 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, and the staggered amplitude is defined as the distance difference of the horizontal center line in the shaping space in the adjacent shaping mechanism 1. It should be noted that the axis of the rotation center of the upper roller 12 and the lower roller 13 in the shaping mechanism 1 is arranged vertically during installation. The diameters of the upper roller 12 and the lower roller 13 in the shaping mechanism 1 are the same, and the diameter is preferably 200mm-250mm, which can provide sufficient heating area as much as possible under the premise of ensuring rigidity. The roller surface of the upper roller 12 and the lower roller 13 is treated with hard chromium plating, the plating thickness is 0.05mm-0.1mm, and the surface roughness Ra≤0.2μm, which not only enhances the wear resistance of the roller surface, but also reduces the friction damage to the surface of the plate, ensuring the surface finish of the product.

[0041] Under the cooperation of the temperature field, the plate is in a softened or high elastic state, and at this time, the alternating bending stress with decreasing amplitude is applied, which can more effectively release the stress in the plate caused by the previous stretching, calendering and other processes. The larger staggered amplitude near the end can more effectively break the initial balance state of the internal stress at a higher temperature, and as the plate is conveyed forward, the plate can slowly cool and shape in a gradually flattened mechanical state after the stress is fully released, thereby improving the elimination effect of the internal stress.

[0042] In the conveying direction, a plurality of shaping mechanisms 1 can be sequentially divided into a preheating zone, a shaping zone and a slow cooling zone, and the surface temperature of the roller body of the plurality of shaping mechanisms 1 as a whole presents 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 temperature range of the roller body surface of the shaping zone, i.e. the shaping mechanism 1 in the plurality of shaping mechanisms 1, is 90℃-170℃, and the specific temperature is adjusted according to the material of the plate. The temperature range of the slow cooling zone is 70℃-80℃. For PVC plates, the preheating zone temperature is preferably 85℃-95℃, the shaping zone temperature is preferably 100℃-120℃, and the slow cooling zone temperature is preferably 75℃-80℃. For PP plates, the preheating zone temperature is preferably 75℃-100℃, the shaping zone temperature is preferably 90℃-130℃, and the slow cooling zone temperature is preferably 70℃-75℃. The temperature control adopts a PID adjustment mode, and the roller body surface temperature fluctuation range is ≤±2℃, which ensures the stability of the temperature gradient.

[0043] In the embodiment, 12 groups of shaping mechanisms 1 are provided, the preheating area includes the first and second groups of shaping mechanisms 1, the heating temperature of the first group of shaping mechanisms 1 is not higher than that of the second group of shaping mechanisms 1, and the plate can be uniformly heated to the process starting temperature. The shaping area includes the third to eighth groups, a total of six groups of shaping mechanisms 1, this area is the core area for eliminating internal stress, and the overall highest process temperature is maintained, wherein the temperature of the six groups of shaping mechanisms 1 in the shaping area can present a fine gradient of first small increase and then slow decrease along the conveying direction, or adjacent shaping mechanisms 1 can be allowed to maintain the same temperature, the core requirement is to maintain the overall temperature trend of the preheating area, the shaping area and the slow cooling area of “first increase and then decrease”, and to ensure the stability and controllability of the stress release process. The slow cooling area includes the ninth to twelfth groups, a total of four groups of shaping mechanisms 1, the temperature control of the four groups of shaping mechanisms 1 is that the temperature of the shaping mechanism 1 located at the rear is not higher than that of the shaping mechanism 1 located at the front, so that the plate can be slowly cooled from the high process temperature and solidified.

[0044] In the embodiment, the temperature of the upper roller 12 body of the first group of shaping mechanisms 1 along the conveying direction is 80°C, the temperature of the upper roller 12 body of the second group of shaping mechanisms 1 is 90°C, the temperature of the upper roller 12 body of the third group of shaping mechanisms 1 is 100°C, the temperature of the upper roller 12 body of the fourth group of shaping mechanisms 1 is 110°C, the temperature of the upper roller 12 body of the fifth group of shaping mechanisms 1 is 120°C, the temperature of the upper roller 12 body of the sixth group of shaping mechanisms 1 is 120°C, the temperature of the upper roller 12 body of the seventh group of shaping mechanisms 1 is 120°C, the temperature of the upper roller 12 body of the eighth group of shaping mechanisms 1 is 120°C, the temperature of the upper roller 12 body of the ninth group of shaping mechanisms 1 is 100°C, the temperature of the upper roller 12 body of the tenth group of shaping mechanisms 1 is 90°C, the temperature of the upper roller 12 body of the eleventh group of shaping mechanisms 1 is 80°C, and the temperature of the upper roller 12 body of the twelfth group of shaping mechanisms 1 is 80°C.

[0045] Wherein, the spacing of each group of shaping mechanisms 1 is 300mm-500mm, the total arrangement length of the 12 groups of mechanisms is 4m-5m, which is suitable for the layout requirements of the conventional plastic plate production line, and the number of shaping mechanisms 1 can be flexibly adjusted according to the thickness and production speed of the plate, for example, for a thin plate with a thickness ≤5mm, 8 groups of shaping mechanisms 1 (2 groups in the preheating area, 4 groups in the shaping area, and 2 groups in the slow cooling area) can be provided, and for a thick plate with a thickness ≥15mm, it can be expanded to 16 groups of shaping mechanisms 1 (3 groups in the preheating area, 8 groups in the shaping area, and 5 groups in the slow cooling area), so that different specifications of plates can obtain sufficient temperature treatment and stress release time.

[0046] Preferably, in the preheating zone, the temperature of the rear shaping mechanism 1 is greater than or equal to the temperature of the front shaping mechanism 1 in each two adjacent groups of shaping mechanisms 1, in the shaping zone, the temperature of one group or multiple adjacent groups of shaping mechanisms 1 is the highest temperature, and in the plate conveying direction, the shaping mechanisms 1 located in front of the shaping mechanism 1 with the highest temperature have an overall temperature rising trend (allowing the temperature of part of the two adjacent groups of shaping mechanisms 1 to be the same), and the shaping mechanisms 1 located behind the shaping mechanism 1 with the highest temperature have an overall temperature decreasing trend (allowing the temperature of part of the two adjacent groups of shaping mechanisms 1 to be the same).

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

[0048] The multi-roll shaping machine of the embodiment can be integrated as a whole on a machine frame 3 through a compact and reasonable layout, and the overall size of the machine is suitable for container loading requirements, and the machine can be transported in the form of a whole machine, which is especially suitable for whole machine export scenarios. The multi-roll shaping machine in the embodiment is transported by a 20GP container, which not only significantly reduces the size of the container required for transportation, but also reduces the space occupation cost and logistics cost of single transportation.

[0049] As shown in Figure 4 and Figure 5 , the heating device 2 includes a plurality of independent heating units, and each heating unit is provided one-to-one with a shaping mechanism 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 in each heating unit is covered by a cover body above the machine frame 3. 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 plate through the roller body, and the internal heating mode can ensure that the temperature of each part of the roller surface is consistent. It should be noted that the two ends of the roller body are connected to the pipeline through a rotary joint, thereby ensuring that the heating fluid does not leak.

[0050] Based on the different temperature requirements, the heating host corresponding to the preheating zone and the shaping zone is an oil temperature machine, and the heating host corresponding to the slow cooling zone is a water temperature machine.

[0051] To ensure the accurate stability of the temperature gradient of each region, the present embodiment adopts the temperature feedback and closed-loop control mechanism in the prior art, each setting mechanism 1 includes a temperature sensor, which collects the actual temperature of the roller body surface in real time and feeds back to the corresponding oil temperature machine / water temperature control system, the control system is built-in PID adjustment algorithm, compares the feedback temperature with the preset process temperature in real time, and automatically adjusts the heating power of the heating host or the circulation flow of the heat transfer medium.

[0052] Embodiment two:

[0053] The present embodiment provides a plastic plate production line, which comprises a calender and the above-mentioned multi-roll setting machine, and the multi-roll setting machine is arranged downstream of the calender and is used for setting the plate after being thickened and pasted with a film by the calender.

[0054] Since the plastic plate production line comprises the multi-roll setting machine, the plate is preheated before setting and gradually cooled down after setting in the setting conveying process, so that new thermal stress is avoided due to sudden temperature change at the setting station, and the internal stress accumulated in the plate in the previous process is eliminated, which fundamentally prevents the problems such as size deformation, warping and even cracking of the product due to stress release in the subsequent process or use, and thus greatly improves the production quality and service life of the plate. Moreover, the method of eliminating the "new stress" and eliminating the "old stress" is integrated in the setting process, and a new stress-relieving station needs to be additionally added on the conveying line, that is, there is no need for intermediate transfer or additional stress-relieving process (such as water cooling station or annealing station), which greatly improves the production efficiency, saves production time and site cost. Obviously, there is no water stain problem caused by the water cooling method.

[0055] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0056] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature is "over", "above" and "on top of" a second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature is "under", "below" and "underneath" a second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0058] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0059] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A multi-roll calender, characterized by, The multiple-roller shaping machine comprises a rack (3), a heating device (2) arranged on the rack (3), and multiple shaping mechanisms (1). The multiple shaping mechanisms (1) are arranged on the rack (3) in sequence along the plate conveying direction. The heating device (2) is connected with the multiple shaping mechanisms (1) respectively, and is used for heating the roller bodies of the shaping mechanisms (1). The roller body surface temperature of the multiple shaping mechanisms (1) gradually increases from the proximal end to the distal end along the conveying direction and then gradually decreases, so as to eliminate the internal stress of the plate through the temperature change.

2. The multiple-roller shaping machine according to claim 1, wherein: The center lines of the shaping spaces of the multiple shaping mechanisms (1) are arranged in an up-and-down staggered manner from the proximal end to the distal end, and the staggered amplitude gradually decreases along the plate conveying direction.

3. The multiple-roller shaping machine according to claim 2, wherein: The shaping mechanism (1) comprises an upper roller (12) and a lower roller (13). The upper roller (12) and the lower roller (13) are arranged in an up-and-down opposite manner, and the space for conveying the plate by the cooperation of the upper roller (12) and the lower roller (13) is the shaping space. The heating device (2) is used for heating the upper roller (12) and the lower roller (13) of the shaping mechanism (1).

4. The multiple-roller shaping machine according to claim 3, wherein: The heating device (2) comprises multiple independent heating units. The multiple heating units are arranged in one-to-one correspondence with the multiple shaping mechanisms (1). Each heating unit comprises a heating host, a water outlet pipe (21), a water inlet pipe (22), and a connecting pipe (23). The water outlet of the heating host is communicated with the water inlet of the upper roller (12) through the water outlet pipe (21). The water outlet of the upper roller (12) is communicated with the water inlet of the lower roller (13) through the connecting pipe (23). The water outlet of the lower roller (13) is communicated with the water inlet of the heating host through the water inlet pipe (22). The heating fluid flowing in the upper roller (12) and the lower roller (13) exchanges heat with the plate through the roller bodies.

5. The multiple-roller shaping machine according to claim 4, wherein: The highest temperature range of the roller body surface of the shaping mechanism (1) in the multiple shaping mechanisms (1) is 90-170℃.

6. The multiple-roller shaping machine according to claim 5, wherein: The heating host of the multiple heating devices (2) is an oil temperature machine or a water temperature machine.

7. The multiple-roller shaping machine according to claim 3, wherein: The shaping mechanism (1) further comprises a lifting unit (11). The moving end of the lifting unit (11) is connected with the upper roller (12), and is used for driving the upper roller (12) to move up and down to adjust the distance between the upper roller (12) and the lower roller (13).

8. The multiple-roller shaping machine according to claim 7, wherein: The lifting unit (11) is configured to adjust the pressure applied by the upper roller (12) in the shaping mechanism (1) to the plate, and the pressure range is 0.4-0.8MPa.

9. A plastic sheet production line, characterized by: The calender and the multi-roller shaping machine according to any one of claims 1-8 are included. The multi-roller shaping machine is arranged downstream of the calender and is used to shape the plate after the film is attached to the plate by the calender.

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