A continuous production system and method of high-flame-retardant high-temperature-resistant PVC plate

Abstract

The application relates to the technical field of PVC plate production, in particular to a high-flame-retardant high-temperature-resistant PVC plate continuous production system and method, which comprises a PVC sandwich plate production device and further comprises a bending mechanism, the bending mechanism is arranged at the rear end of the device and is used for bending the sandwich plate; a slitting mechanism is arranged at the front end of the bending mechanism and is used for slitting the edges of the sandwich plate for subsequent bending and edge sealing; and an edge sealing mechanism is arranged behind the bending mechanism and is used for sealing the edges of the sandwich plate. The technical problems of inconvenient construction and poor light reflection effect of the existing reflective material are solved.

Description

Technical Field

[0001] This invention relates to the field of PVC sheet production technology, and in particular to a continuous production system and method for PVC sheets with high flame retardancy and high temperature resistance. Background Technology

[0002] PVC boards are functional boards made primarily of polyvinyl chloride resin, possessing properties such as corrosion resistance, water and flame retardancy, and ease of processing. They are broadly categorized into three types: solid boards, emphasizing industrial corrosion resistance; foamed boards, used for lightweight insulation and advertising decoration; and sandwich boards, as high-end composite materials, employing a "sandwich" structure to achieve extreme lightweighting while maintaining high strength and excellent thermal and sound insulation performance. They represent an advanced solution for meeting the integrated needs of modern building curtain walls, vehicle interiors, high-end displays, and special projects such as fireproof partitions and road safety facilities, demanding lightweight, high strength, and multifunctionality.

[0003] Patent document CN222711610U discloses a sandwich panel production line, including a conveying device, a pushing device, and a processing device. The pushing device includes a base, a clamping module mounted on the base, and a pressure sensor mounted on the conveying device. The clamping module has a relaxed state (no interference with the sandwich panel) and a clamping state (clamping the sandwich panel). The conveying device, pushing device, and processing device are arranged sequentially along the conveying direction of the sandwich panel. When the pressure sensor detects that the pressure is less than the normal value, the clamping module is in the clamping state, clamping the sandwich panel and sending it into the cutting device. When the double tracks still exert clamping force on the sandwich panel, the pressure sensor detects the normal pressure value. At this time, the clamping module is in the relaxed state, and the clamping module does not interfere with the sandwich panel. The sandwich panel can directly enter the cutting device through the pushing device.

[0004] However, in actual use, PVC panels are often used as guardrails in scenarios with low traffic volume and low vehicle speed. Warning reflective signs are often affixed to them, but after long-term use, their reflective effect is often unsatisfactory, with issues such as peeling, oxidation, and dust obscuring them. At the same time, they also present inconveniences during construction. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by setting up a bending mechanism to change the common external application method. By utilizing the gaps inside the sandwich panel, the reflective layer is placed inward into the PVC board to form a specific reflective angle, thereby improving its reflective effect in special road environments and slowing down the shedding, oxidation, and dust obscuring of reflective materials. This solves the technical problems of inconvenient construction and poor reflective effect of existing reflective materials.

[0006] To address the above technical issues, the following technical solution is adopted: A continuous production system for high flame retardant and high temperature resistant PVC boards includes a PVC sandwich panel production device, and further includes: A bending mechanism is provided at the rear end of the device and is used to bend the sandwich panel, including a bending assembly for bending the surface layer of the sandwich panel and a post-processing assembly provided behind the bending assembly for fixing the surface layer. The bending assembly includes a support plate slidably connected to the bottom of the panel, a slitting groove provided on the support plate, a slitting blade provided on the top of the support plate, and a hinge plate rotatably connected to the middle of the support plate. The bending assembly cuts the sandwich panel surface layer to form a concave layer. Then, a stepped groove is ground on the surface of the concave layer and bent. After bending to a specific angle, a reflective material is coated on the surface.

[0007] Preferably, the bending assembly further includes a milling cutter slidably connected to the support plate, a first heating tube disposed on the support plate, and a second heating tube disposed outside the slitting cutter.

[0008] Preferably, the post-processing assembly includes a stabilizing frame fixed behind the bending assembly, a partition plate slidably connected to the stabilizing frame and used to support both sides of the concave layer, a discharge port provided above the partition plate, a third heating tube provided at the lower end of the partition plate, and a lower pressure plate hinged to the upper end of the partition plate. The post-processing component releases reflective material on the concave plate. The inclination of the concave groove and the stepped groove on the surface allow the reflective material to flow and achieve uneven coverage with a thicker outer layer and a thinner inner layer.

[0009] Preferably, the continuous production system for high flame retardant and high temperature resistant PVC board further includes a slitting mechanism. The slitting mechanism is located at the front end of the bending mechanism and is used to slit the edges of the sandwich panel for subsequent bending and edge sealing. The slitting mechanism includes a positioning plate on one side of the conveying device, a push plate slidably connected to the other side of the conveying device, a stabilizing wheel rotatably connected to the positioning plate, and a slitting assembly on the positioning plate.

[0010] Preferably, the slitting assembly includes an isolation frame on a positioning plate, a hot air gun disposed within the isolation frame, a separation shaft rotatably connected to the rear of the isolation frame, and a first cutting machine and a second cutting machine disposed behind the separation shaft for vertical and horizontal slitting of the sandwich panel.

[0011] Preferably, the slitting assembly further includes a separating plate slidably connected to the positioning plate, multiple sets of cleaning rollers rotatably connected below the separating plate, an output slot disposed behind the separating plate, an output frame rotatably connected above the output slot, and multiple sets of suction cups slidably connected to the output frame. The sandwich panel is heated until the glue inside melts, then the surface layer is separated from the core layer. The sandwich panel is then cut, removing the upper surface layer and the core layer, leaving only the lower surface layer. Waste material is removed and the lower surface layer is cleaned.

[0012] Preferably, the high flame-retardant and high-temperature resistant PVC board continuous production system further includes an edge-sealing mechanism disposed behind the bending mechanism for sealing the sandwich panel. The edge-sealing mechanism includes a heating component disposed behind the bending mechanism and a pressing component disposed on the heating component for bending, sealing and fixing.

[0013] Preferably, the heating assembly includes a lower heater disposed below the sandwich panel, an upper heater slidably connected above the lower heater, two sets of hot air pipes slidably connected to both sides of the upper heater, and a sliding plate slidably connected to the air outlet of the hot air pipes.

[0014] Preferably, the pressing assembly includes a pressing plate rotatably connected to the outside of the lower heater, multiple sets of chip removal grooves disposed on the pressing plate, and a grinder slidably connected to the chip removal grooves; The edge sealing mechanism grinds drainage grooves on the reserved surface layer, and heats the surface layer to a bendable temperature and bends it. Before bending, the surfaces on both sides are heated and roughened to fuse and fix the surface layer and the core layer.

[0015] As a further preferred embodiment, the continuous production method for high flame retardant and high temperature resistant PVC boards, applied to the aforementioned continuous production system for high flame retardant and high temperature resistant PVC boards, includes the following steps: Step 1: Cutting Step. The PVC board is fed into the cutting mechanism to cut the edges of the sandwich panel. The glue used to bond the sandwich panel is melted by heating, which separates the surface layer from the core layer. Only one surface layer is left for edge sealing. The other surface layer and core are cut off and discharged, and the surface of the surface layer is cleaned. Step 2, bending step: Continue to cut the PVC a second time, cut the other side layer of the complete sandwich panel to form a rectangular concave plate with complete side connection, and set a stepped groove on the surface. Heat and bend the concave plate outward, then release the reflective material. The reflective material flows down to form a reflective layer. Then bend the concave plate inward. At this time, the upper and lower ends of the concave plate reach the end, and the reflective material flows down again. The stepped groove leaves the reflective material at the upper end, thus forming a specific arrangement of more reflective material on the outer layer and less reflective material on the inner side of the concave plate. Bend the concave plate to a specific angle. Step 3, edge sealing: Heat the lower surface layer reserved during the cutting process, and simultaneously heat the upper surface of the surface layer and the edge of the core layer to make the PVC material melt to a certain extent. Then bend the lower surface layer to combine the edge of the surface layer and the core layer, and grind drainage grooves on the surface layer to complete the edge sealing.

[0016] The beneficial effects of this invention are: (1) In this invention, a concave structure with a specific angle is created on the sandwich panel surface by bending mechanism, and reflective material is coated inside it. This built-in reflective layer design fundamentally avoids the problems of peeling off, being easily blocked by dust and accelerated oxidation by direct sunlight that are traditionally applied external reflective film or coating, thereby greatly improving the durability and longevity of reflective signs. (2) In this invention, a specific reflective angle can be formed by combining a concave structure with a specific gradient coverage of reflective material that is "thick on the outside and thin on the inside". This makes the light mainly reflected to the vicinity of the vehicle, which makes it easier for the driver to clearly judge the position of the guardrail on low-speed roads. At the same time, it avoids disordered strong light reflection to a distance or in various directions, reduces interference with the driver's attention, and is more in line with the safety requirements of specific road environments. (3) In this invention, after the concave layer is bent, the edge sealing mechanism will bend and seal the reserved lower surface layer. The drainage grooves polished on the upper surface of this edge sealing structure can be naturally washed by rainwater to achieve a certain degree of self-cleaning function. At the same time, the edge sealing structure provides a physical shield for the built-in reflective layer, further protecting it from direct rainwater washing and the accumulation of a large amount of dust; (4) In this invention, the entire system is connected to the upstream PVC sandwich panel production device, realizing continuous and automated production from standard sandwich panels to finished guardrails. Through the heating, separation, cutting and cleaning steps of the slitting mechanism, as well as the heating fusion and surface roughening treatment in the edge sealing mechanism, the surface layer and the core layer are firmly fused at the edge sealing, avoiding interface delamination and improving the stability and durability of the overall product structure.

[0017] In summary, this equipment has the advantages of simple structure, high production efficiency, and stable quality, and is especially suitable for the field of PVC sheet production technology. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a continuous production system for high flame retardant and high temperature resistant PVC boards.

[0020] Figure 2 This is a partial structural diagram of a continuous production system for high flame retardant and high temperature resistant PVC boards.

[0021] Figure 3 This is a schematic diagram of the bending component.

[0022] Figure 4 This is a schematic diagram of the post-processing component.

[0023] Figure 5 This is a partial structural diagram of the post-processing component.

[0024] Figure 6 This is a schematic diagram of the processing state of the sheet metal in the bending mechanism.

[0025] Figure 7 This is a schematic diagram of the slitting mechanism.

[0026] Figure 8 This is a schematic diagram of the relevant structure of the output slot.

[0027] Figure 9 This is a schematic diagram illustrating the continuous process of cutting and sealing the board.

[0028] Figure 10 This is a schematic diagram of the edge sealing mechanism.

[0029] Figure 11 This is a schematic diagram of the relevant structure of the upper heater.

[0030] Figure 12 This is a schematic diagram of the relevant structure of the lower heater.

[0031] Figure 13 This is a schematic diagram of a continuous production method for high flame retardant and high temperature resistant PVC boards. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] Example 1 like Figure 1 , Figure 2 , Figure 3 As shown, a continuous production system for high flame retardant and high temperature resistant PVC boards includes a PVC sandwich panel production device 01, and further includes: Bending mechanism 1, which is disposed at the rear end of the device and is used to bend the sandwich panel, includes a bending assembly 11 for bending the surface layer of the sandwich panel and a post-processing assembly 12 disposed behind the bending assembly 11 for fixing the surface layer. The bending assembly 11 includes a support plate 111 slidably connected to the bottom of the panel, a slitting groove 112 disposed on the support plate 111, a slitting blade 113 disposed above the support plate 111, and a hinge plate 114 rotatably connected to the middle of the support plate 111. The bending component 11 cuts the sandwich panel surface layer to form a concave layer. Then, a stepped groove is ground on the surface of the concave layer and bent. After bending to a specific angle, a reflective material is coated on the surface.

[0034] Furthermore, such as Figure 3 As shown, the bending assembly 11 also includes a milling cutter 115 slidably connected to the support plate 111, a first heating tube 116 disposed on the support plate 111, and a second heating tube 117 disposed outside the slitting cutter 113.

[0035] Furthermore, such as Figure 4 , Figure 5 , Figure 6 As shown, the post-processing assembly 12 includes a stabilizing frame 121 fixed behind the bending assembly 11, a partition 122 slidably connected to the stabilizing frame 121 and used to support both sides of the concave layer, a discharge port 123 disposed above the partition 122, a third heating tube 124 disposed at the lower end of the partition 122, and a lower pressure plate 125 hinged to the upper end of the partition 122. The post-processing component 12 releases reflective material on the concave plate, and by utilizing the inclination of the concave groove and the stepped groove on the surface, the reflective material flows and achieves uneven coverage with a thicker outer layer and a thinner inner layer.

[0036] In this embodiment, by setting the bending component 11, the PVC sandwich panel is processed to make the surface layer of the sandwich panel concave inward and tilted at a specific angle, and a reflective coating is set on it, thereby improving its reflective warning effect when used as a road guardrail.

[0037] PVC sheets can be used as road guardrails, mainly suitable for scenarios with low traffic volume and low vehicle speed, such as parks and internal roads in residential areas. Their core advantages are corrosion resistance and rust prevention, lightweight and easy installation, maintenance-free and beautiful appearance. Regarding the installation of reflective warning signs on these roads, current technologies primarily utilize reflective film and reflective paint for road guardrails, each with distinct advantages and disadvantages. Reflective film boasts strong reflectivity and high durability, making it the preferred choice for high-standard roads such as highways, but its cost is relatively high; installation requires specialized expertise; poor substrate or adhesive may lead to edge lifting or detachment; the surface is prone to dust accumulation, requiring regular cleaning to maintain its effectiveness; reflective paint offers flexible application and lower cost, suitable for complex-shaped guardrails or budget-constrained scenarios, but its overall reflectivity and retroreflective coefficient are typically lower than high-performance reflective film; the coating is prone to wear and aging, resulting in a shorter lifespan; long-term use may lead to a decrease in brightness due to dust accumulation and rain streaks.

[0038] Therefore, this application uses PVC sandwich panels, cuts open the surface layer of the sandwich panels to create an inward groove, and coats the surface of the concave side with reflective paint. This allows the reflective material to be located inside the sandwich panel, and the "eaves" formed by the top sealing edge create a shielding effect on the reflective material. This avoids direct sunlight, slows down the oxidation of the reflective paint, and extends its lifespan. It also prevents the reflective layer from being directly exposed to the outside, which would cause dust to adhere directly to the surface of the reflective layer and affect its reflective effect. On the other hand, for low-speed roads, where drivers travel at lower speeds and these roads are generally narrower and shorter, the reflective effect of the reflective layer is mainly used by drivers to judge the position of the guardrails on both sides to avoid collisions at night. Therefore, the need for reflective warning effects on distant paths is weaker, and the reflective warning effect on nearby paths should be strengthened to facilitate drivers' judgment of distance. This application uses a concave reflective layer, so that when the distance is far, the light is blocked and no reflection occurs, avoiding glare and the distraction of drivers' attention caused by a large amount of bright reflections on the roadside, allowing them to focus on the reflective warnings on the road ahead. At the same time, reflective coating is used to avoid the problem of reflective film peeling off after long-term use.

[0039] The pre-cut sandwich panel enters the bending assembly 11. The support plate 111 moves and extends below the upper layer to support it. The upper layer is cut into a rectangular concave layer with one side completely connected by the cutting groove 112. The surface of the concave layer is used to coat reflective paint. The milling cutter 115 moves back and forth to mill a stepped groove on the surface of the concave plate. Then, the first heating tube 116 and the second heating tube 117 heat the two sides of the root of the concave layer to a temperature that allows it to heat up. When the temperature is adjusted during bending, the hinge plate 114 of the support plate 111 rotates upward, lifting the concave layer outward. The sandwich panel moves back to the middle of the partition plate 122, which clamps the concave layer to form a sealed space. The upper discharge port 123 releases reflective paint, which flows from top to bottom and covers the entire concave layer. Then, the third heating pipe 124 heats the root of the concave layer again, and the lower pressure plate 125 rotates, pressing the concave layer down into the core layer to achieve a specific reflective angle for the concave layer.

[0040] It should be noted that reflective coatings can be made of glass microspheres. The principle involves pre-mixing a large number of glass microspheres into the coating or spreading them onto the undried surface of the coating after application. When illuminated by vehicle headlights, these microspheres efficiently reflect the light back towards the light source, achieving a warning effect. When the reflective coating is released from the discharge port 123, the concave layer curves upwards, releasing the reflective coating from the upper section. The reflective coating flows downwards, creating a thinner upper section and a thicker lower section effect. After the concave layer is pressed down into the core layer, the reflective brightness at the base reaches its maximum when illuminated. As the vehicle approaches, the illuminated area increases, primarily enhancing the reflective area rather than increasing the overall brightness, thus ensuring the driver can see clearly without glare.

[0041] Furthermore, such as Figure 1 , Figure 7 , Figure 9 As shown, the high flame-retardant and high-temperature resistant PVC board continuous production system further includes: The slitting mechanism 2 is provided at the front end of the bending mechanism 1 and is used to slit the edge of the sandwich panel for subsequent bending and sealing. The slitting mechanism 2 includes a positioning plate 21 on one side of the conveying device, a push plate 22 slidably connected to the other side of the conveying device, a stabilizing wheel 23 rotatably connected to the positioning plate 21, and a slitting assembly 24 on the positioning plate 21.

[0042] Furthermore, such as Figure 7 As shown, the slitting assembly 24 includes an isolation frame 241 set on the positioning plate 21, a hot air gun 242 set inside the isolation frame 241, a separation shaft 243 rotatably connected to the rear of the isolation frame 241, and a first cutting machine 244 and a second cutting machine 245 set behind the separation shaft 243 for vertical and horizontal slitting of the sandwich panel.

[0043] Furthermore, such as Figure 8 As shown, the slitting assembly 24 also includes a separating plate 246 slidably connected to the positioning plate 21, multiple sets of cleaning rollers 247 rotatably connected below the separating plate 246, an output groove 248 disposed behind the separating plate 246, an output frame 249 rotatably connected above the output groove 248, and multiple sets of suction cups 250 slidably connected to the output frame 249. The sandwich panel is heated until the glue inside melts, then the surface layer is separated from the core layer. The sandwich panel is then cut, removing the upper surface layer and the core layer, leaving only the lower surface layer. Waste material is removed and the lower surface layer is cleaned.

[0044] In this embodiment, by setting the cutting component 24, the edges of the standardized sandwich panel are processed, and a portion of the core layer and the surface layer are removed, leaving the lower surface layer that can be used to complete the subsequent edge sealing, thus performing pre-processing for the setting of the concave plate.

[0045] In detail, the sandwich panel is placed on the conveying device, and the pusher plate 22 pushes the sandwich panel to adhere to the positioning plate 21 to achieve stable positioning. The stabilizing wheel 23 assists in pushing the sandwich panel forward. The edge of the sandwich panel that needs to be processed enters the isolation frame 241, where the hot air gun 242 heats it to melt the glue between the adhesive layer and the core layer. The separating shaft 243 rotates, and the fan blades on the separating shaft 243 can apply a certain pressure to the lower surface layer, thereby separating the surface layer from the core layer. The first cutting machine 244 and the second cutting machine 245 cut the upper surface layer and the core layer. Then, the separating plate 246 penetrates between the lower surface layer and the core layer. The cleaning roller 247 cleans the glue on the lower surface layer. The output frame 249 rotates, and the suction cup 250 on it removes the separated upper surface layer and core layer and outputs them through the output slot 248.

[0046] Sandwich panels have surface layers on both sides and a core layer in the middle. If the edges are not sealed, rainwater and dust will accumulate in the grooves of the core layer, which is not conducive to the installation of the reflective layer on top. Therefore, the excess part is cut to create a lower surface layer for edge sealing.

[0047] It should be noted that the hot air gun 242 can melt the glue by heating, thereby achieving complete separation of the core layer and the surface layer. At the same time, it can preheat the sandwich panel, so that it can be quickly heated at specific locations during the subsequent bending process to achieve bending.

[0048] Furthermore, such as Figure 10 As shown, the high flame retardant and high temperature resistant PVC board continuous production system further includes an edge sealing mechanism 3 located behind the bending mechanism 1 for sealing the edges of the sandwich panel. The edge sealing mechanism 3 includes a heating component 31 located behind the bending mechanism 1 and a pressing component 32 located on the heating component 31 for bending, sealing and fixing.

[0049] Furthermore, such as Figure 10 , Figure 11 As shown, the heating assembly 31 includes a lower heater 311 disposed below the sandwich panel, an upper heater 312 slidably connected above the lower heater 311, two sets of hot air pipes 313 slidably connected to both sides of the upper heater 312, and a sliding plate 314 slidably connected to the air outlet of the hot air pipes 313.

[0050] Furthermore, such as Figure 12 As shown, the pressing assembly 32 includes a pressing plate 315 rotatably connected to the outside of the lower heater 311, multiple sets of chip removal grooves 316 disposed on the pressing plate 315, and a grinder 317 slidably connected to the chip removal grooves 316. The edge sealing mechanism 3 grinds drainage grooves on the reserved surface layer, and heats the surface layer to a bendable temperature and bends it. Before bending, the two sides are heated and roughened to fuse and fix the surface layer and the core layer.

[0051] In this embodiment, by setting the edge sealing mechanism 3, the treated lower layer is bent and the edges of the surface layer and the core layer are stably fixed, and a drainage groove for self-cleaning of the reflective layer is polished out.

[0052] In detail, the concave layer of the sandwich panel is bent thick and fed into the edge sealing mechanism 3. The lower heater 311 and the upper heater 312 simultaneously heat the root of the lower layer. After heating to a suitable temperature, the pressing plate 315 rotates and bends the layer, causing the upper heater 312 to move upward. The two sets of hot air pipes 313 on both sides rotate simultaneously to heat the upper side of the layer and the side wall of the core layer, causing them to melt appropriately. The sliding plate 314 slides back and forth on the hot air pipe 313. The surface of the sliding plate 314 is not smooth. Through the sliding of the sliding plate 314, the upper side surface of the layer is uneven. The pressing plate 315 rotates and turns the horizontal layer to the vertical, fitting it against the edge of the core layer. Through the heated and melted surface, the two can be fully fixed and bonded. The uneven surface is used to avoid obvious interface delamination during the contact process between the two.

[0053] It should be noted that a grinding machine 317 is installed on the pressed plate 315. The grinding machine 317 grinds and grooves the surface of the outer layer, creating drainage channels corresponding to the positions of the recessed layers. Over time, dust will inevitably accumulate on the recessed layers. Rainwater flowing down the drainage channels can directly wash the surface of the recessed layers.

[0054] It is worth mentioning that, by sealing the edges, on the one hand, the inner concave layer is shielded to prevent oxidation from direct sunlight and the rapid accumulation of dust. On the other hand, the position of the concave layer is fixed. The concave layer and the edge seal are connected to each other. When there is a temperature difference, the deflection angle may change due to thermal expansion and contraction. By using the edge seal to fix it, deviations can be prevented or reduced, thereby maintaining a stable reflection angle.

[0055] Example 2 like Figure 13 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows: Furthermore, such as Figure 13 As shown, the continuous production method for high flame retardant and high temperature resistant PVC boards, applied to the aforementioned continuous production system for high flame retardant and high temperature resistant PVC boards, includes the following steps: Step 1: Cutting Step. The PVC board is fed into the cutting mechanism 2 to cut the edges of the sandwich panel. The glue used to bond the sandwich panel is melted by heating, which separates the surface layer from the core layer. Only one surface layer is left for edge sealing. The other surface layer and core are cut off and discharged, and the surface of the surface layer is cleaned. Step 2, bending step: Continue to cut the PVC a second time, cut the other side layer of the complete sandwich panel to form a rectangular concave plate with complete side connection, and set a stepped groove on the surface. Heat and bend the concave plate outward, then release the reflective material. The reflective material flows down to form a reflective layer. Then bend the concave plate inward. At this time, the upper and lower ends of the concave plate reach the end, and the reflective material flows down again. The stepped groove leaves the reflective material at the upper end, thus forming a specific arrangement of more reflective material on the outer layer and less reflective material on the inner side of the concave plate. Bend the concave plate to a specific angle. Step 3, edge sealing: Heat the lower surface layer reserved during the cutting process, and simultaneously heat the upper surface of the surface layer and the edge of the core layer to make the PVC material melt to a certain extent. Then bend the lower surface layer to combine the edge of the surface layer and the core layer, and grind drainage grooves on the surface layer to complete the edge sealing.

[0056] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0057] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A continuous production system for high flame retardant and high temperature resistant PVC boards, comprising a PVC sandwich panel production device (01), characterized in that, Also includes: The bending mechanism (1) is located at the rear end of the device and is used to bend the sandwich panel. It includes a bending assembly (11) for bending the sandwich panel surface layer and a post-processing assembly (12) located behind the bending assembly (11) for fixing the surface layer. The bending assembly (11) includes a support plate (111) slidably connected to the bottom of the panel, a slitting groove (112) provided on the support plate (111), a slitting blade (113) provided above the support plate (111), and a hinge plate (114) rotatably connected to the middle of the support plate (111). The bending component (11) cuts the sandwich panel surface layer to form a concave layer. Then, a stepped groove is ground on the surface of the concave layer and bent. After bending to a specific angle, a reflective material is coated on the surface.

2. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 1, characterized in that, The bending assembly (11) also includes a milling cutter (115) slidably connected to the support plate (111), a first heating tube (116) disposed on the support plate (111), and a second heating tube (117) disposed outside the slitting cutter (113).

3. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 1, characterized in that, The post-processing assembly (12) includes a stabilizing frame (121) fixed behind the bending assembly (11), a partition (122) slidably connected to the stabilizing frame (121) and used to support both sides of the concave layer, a discharge port (123) provided above the partition (122), a third heating tube (124) provided at the lower end of the partition (122), and a lower pressure plate (125) hinged to the upper end of the partition (122). The post-processing component (12) releases reflective material on the concave plate, using the inclination of the concave groove and the stepped groove on the surface to make the reflective material flow and achieve uneven coverage with a thicker outer layer and a thinner inner layer.

4. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 1, characterized in that, Also includes: The slitting mechanism (2) is provided at the front end of the bending mechanism (1) and is used to slit the edge of the sandwich panel for subsequent bending and sealing. The slitting mechanism (2) includes a positioning plate (21) on one side of the conveying device, a push plate (22) slidably connected to the other side of the conveying device, a stabilizing wheel (23) rotatably connected to the positioning plate (21), and a slitting assembly (24) on the positioning plate (21).

5. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 4, characterized in that, The slitting assembly (24) includes an isolation frame (241) on a positioning plate (21), a hot air gun (242) inside the isolation frame (241), a separation shaft (243) rotatably connected to the rear of the isolation frame (241), and a first cutting machine (244) and a second cutting machine (245) located behind the separation shaft (243) for vertical and horizontal slitting of the sandwich panel.

6. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 5, characterized in that, The slitting assembly (24) further includes a separating plate (246) slidably connected to the positioning plate (21), multiple sets of cleaning rollers (247) rotatably connected below the separating plate (246), an output groove (248) disposed behind the separating plate (246), an output frame (249) rotatably connected above the output groove (248), and multiple sets of suction cups (250) slidably connected to the output frame (249). The sandwich panel is heated until the glue inside melts, then the surface layer is separated from the core layer. The sandwich panel is then cut, removing the upper surface layer and the core layer, leaving only the lower surface layer. Waste material is removed and the lower surface layer is cleaned.

7. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 1, characterized in that, It also includes an edge sealing mechanism (3) disposed behind the bending mechanism (1) and used for sealing the edge of the sandwich panel. The edge sealing mechanism (3) includes a heating component (31) disposed behind the bending mechanism (1) and a pressing component (32) disposed on the heating component (31) and used for bending, sealing and fixing.

8. The continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 7, characterized in that, The heating assembly (31) includes a lower heater (311) disposed below the sandwich panel, an upper heater (312) slidably connected above the lower heater (311), two sets of hot air pipes (313) slidably connected to both sides of the upper heater (312), and a sliding plate (314) slidably connected to the air outlet of the hot air pipe (313).

9. A continuous production system for high flame retardant and high temperature resistant PVC boards according to claim 8, characterized in that, The pressing assembly (32) includes a pressing plate (315) rotatably connected to the outside of the lower heater (311), multiple sets of chip removal grooves (316) disposed on the pressing plate (315), and a grinder (317) slidably connected to the chip removal grooves (316). The edge sealing mechanism (3) grinds out drainage grooves on the reserved surface layer, and heats the surface layer to a bendable temperature and bends it. Before bending, the two sides are heated and roughened to fuse and fix the surface layer and the core layer.

10. A continuous production method for high flame retardant and high temperature resistant PVC boards, applied to the continuous production system for high flame retardant and high temperature resistant PVC boards as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Cutting Step. The PVC board is fed into the cutting mechanism (2) to cut the edges of the sandwich panel. The glue of the sandwich panel is melted by heating, so that the surface layer and the core layer are separated. Only one surface layer is left for sealing the edges. The other surface layer and the core are cut out and the surface of the surface layer is cleaned. Step 2, bending step: Continue to cut the PVC a second time, cut the other side layer of the complete sandwich panel to form a rectangular concave plate with complete side connection, and set a stepped groove on the surface. Heat and bend the concave plate outward, then release the reflective material. The reflective material flows down to form a reflective layer. Then bend the concave plate inward. At this time, the upper and lower ends of the concave plate reach the end, and the reflective material flows down again. The stepped groove leaves the reflective material at the upper end, thus forming a specific arrangement of more reflective material on the outer layer and less reflective material on the inner side of the concave plate. Bend the concave plate to a specific angle. Step 3, edge sealing: Heat the lower surface layer reserved during the cutting process, and simultaneously heat the upper surface of the surface layer and the edge of the core layer to make the PVC material melt to a certain extent. Then bend the lower surface layer to combine the edge of the surface layer and the core layer, and grind drainage grooves on the surface layer to complete the edge sealing.

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