Continuous thermal compounding system and preparation method of high-flame-retardant composite PVC (polyvinyl chloride) board

Abstract

The invention relates to the technical field of composite material production, in particular to a continuous thermal compounding system of a high-flame-retardant composite PVC (polyvinyl chloride) board, which comprises a machine body, a production mechanism is arranged on the machine body and is used for thermal compounding production of the composite PVC board, and the production mechanism comprises a feeding assembly, a discharging assembly, a feeding assembly, a discharging assembly and a discharging assembly, the feeding assembly comprises a base fixed at the front end of the machine body, and a vertical frame is fixed at the rear end of the top of the base; a Z-axis electric sliding table is installed in the vertical frame, a supporting plate is fixed to a sliding block of the Z-axis electric sliding table, a first X-axis electric sliding table is installed at the front end of the top of the base, a rotary air cylinder is installed on a sliding block of the first X-axis electric sliding table, a mounting base is fixed to the output end of the rotary air cylinder, and loading frames are fixed to the two ends of the top of the mounting base. Continuous feeding is achieved through the feeding assembly and the conveying assembly, and production continuity is ensured; the plate is stably transferred through the carrying assembly, and the falling risk is prevented; and the pressing and blanking procedures are synchronously completed through the machining assembly, the production efficiency is improved, and follow-up production smoothness is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material production, and specifically to a continuous thermal composite system and preparation method for a highly flame-retardant composite PVC board. Background Art

[0002] With the increasingly strict requirements for the fire safety of materials in the fields of construction, transportation, electronics and electricity, etc., traditional PVC boards are difficult to meet the high-standard flame-retardant requirements due to their flammability; highly flame-retardant composite PVC boards, through multi-layer composite + flame-retardant modification, while retaining the advantages of PVC such as light weight and corrosion resistance, significantly improve the flame-retardant performance and become an ideal fire-proof material to replace wood and metal;

[0003] Upon inquiry, the publication number: CN215620045U discloses a continuous thermal composite production line for high-precision PVC boards. The following technical solutions are disclosed in this technology: "A continuous thermal composite production line for high-precision PVC boards, including a conveying frame, two material storage cylinders are provided on the top of the conveying frame, the bottoms of the material storage cylinders are fixedly arranged on the top of the conveying frame through support rods, the inside of the material storage cylinders is stacked with boards, and a blanking mechanism is provided on both the left and right sides inside the material storage cylinders; the blanking mechanism includes a first cylinder, a connecting plate, a connecting rod, a sleeve, a baffle and a receiving plate, a cylinder cover is provided on the top of the material storage cylinder, the first cylinder is symmetrically fixedly arranged on the top of the cylinder cover, the connecting plate is horizontally arranged at the end of the piston rod of the first cylinder, the connecting rod is fixedly arranged on the lower surfaces of the left and right sides of the connecting plate, and the sleeve is vertically located on both the left and right sides inside the material storage cylinder", etc. Technical effects such as "low operation intensity, high continuity of thermal composite, and improved production efficiency" are achieved.

[0004] The main problems existing in the production of highly flame-retardant composite PVC boards in the prior art are as follows: First, when the boards in the loading rack are used up, it is necessary to stop the machine to replenish raw materials, resulting in the forced interruption of the production process; second, during the transfer process of the boards, they are only fixed by vacuum suction cups, and it is easy to cause the boards to fall off or shift due to insufficient adsorption force during high-speed movement. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a continuous thermal composite system and preparation method for a highly flame-retardant composite PVC board, which realizes uninterrupted continuous feeding through a feeding component and a conveying component to ensure the continuity of production; ensures the stable transfer of the boards through a handling component to prevent the risk of falling off; and synchronously completes the pressing and blanking processes through a processing component to improve production efficiency and ensure the smooth progress of subsequent production.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A continuous thermal composite system for a highly flame-retardant composite PVC board, including a machine body, a production mechanism is arranged on the machine body and is used for the thermal composite production of PVC boards. The production mechanism includes:

[0007] The feeding component includes a base fixed to the front end of the machine body. A vertical frame is fixed to the rear end of the top of the base. A Z-axis electric sliding table is installed inside the vertical frame. A pallet is fixed to the slider of the Z-axis electric sliding table. A first X-axis electric sliding table is installed at the front end of the top of the base. A rotary cylinder is installed on the slider of the first X-axis electric sliding table. The output end of the rotary cylinder is fixed with a mounting seat, and loading racks are fixed at both ends of the top of the mounting seat;

[0008] The handling component includes a second X-axis electric sliding table installed at the upper end inside the vertical frame, and a grasping component is arranged on the slider of the second X-axis electric sliding table;

[0009] The conveying component is arranged on the machine body and is used for conveying the flame-retardant film;

[0010] The processing component includes a third X-axis electric sliding table installed on the top of the machine body. A positioning component is arranged on the slider of the third X-axis electric sliding table, and a pressing component is arranged on the machine body;

[0011] The hot-melting component is arranged on the conveying component and is used for heating and melting the surface layer of the PVC base board.

[0012] Preferably, the grasping component includes a cross plate fixed to the slider of the second X-axis electric sliding table. Vertical plates are fixed at both ends of the cross plate. A lower shaft rod is rotatably installed at the lower end inside the vertical plate. Drag buckles are fixed at both ends of the lower shaft rod. An upper shaft rod is fixed at the upper end inside the vertical plate. A short-stroke cylinder is rotatably installed on the upper shaft rod, and the output end of the short-stroke cylinder is rotatably installed with the lower shaft rod.

[0013] Preferably, the grasping component further includes a double-shaft cylinder fixed to the lower end of the cross plate. The output end of the double-shaft cylinder is fixed with a mounting plate, and suction cups are installed at the four corners of the mounting plate.

[0014] Preferably, the positioning component includes a positioning seat fixed to the slider of the third X-axis electric sliding table. A positioning groove is opened inside the positioning seat, and a knife groove is opened on the outer edge inside the positioning seat.

[0015] Preferably, the pressing component includes a top plate arranged above the machine body. Vertical rods are fixed between the four corners of the top plate and the machine body. A hydraulic cylinder is installed on the top of the top plate. The output end of the hydraulic cylinder is fixed with a movable plate, and the movable plate is slidably installed with the vertical rods. A pressing plate is fixed to the bottom of the movable plate, and blades are installed on the outer edge of the bottom of the pressing plate.

[0016] Preferably, the conveying component includes shaft frames fixed to the left and right ends of the machine body. A winding roller is rotatably installed inside the shaft frames, and a motor is installed on the outer wall of the shaft frames and is used for driving the winding roller to rotate.

[0017] Preferably, the hot-melting component includes a cross frame fixed between the shaft frames at the left and right ends. A sliding seat is slidably installed at the front end of the cross frame, and three hot pressing rollers are installed at the lower end of the sliding seat.

[0018] Preferably, a long-stroke cylinder is installed on the cross frame, and the output end of the long-stroke cylinder is connected to the hot press roller.

[0019] Preferably, the feeding assembly further includes a cavity formed at the bottom of the loading rack.

[0020] The present invention also discloses a method for preparing a highly flame-retardant composite PVC board, comprising the following steps:

[0021] S1: First, stack the pretreated PVC base boards in the loading rack, and then install the flame-retardant film in the winding state between the conveying assemblies at both ends;

[0022] S2: Then, drive the pallet to lift the stacked PVC base boards upward through the Z-axis electric slide table to achieve continuous feeding one by one; then, grab the PVC base board through the grabbing component, move it to the positioning component through the second X-axis electric slide table, and heat and melt the surface of the PVC base board in the positioning component through the hot melting component;

[0023] S3: Finally, drive the PVC base board in the positioning component to move to the pressing component through the third X-axis electric slide table, and press the flame-retardant film and the PVC base board through the pressing component

[0024] The present invention provides a continuous thermal composite system and a preparation method for a highly flame-retardant composite PVC board. Compared with the prior art, the following beneficial effects are achieved:

[0025] 1. By stacking the PVC base boards in the loading rack and driving the pallet to intermittently lift the stacked PVC base boards through the Z-axis electric slide table, continuous feeding of the PVC base boards one by one is achieved; moreover, when the PVC base boards stacked in the rear loading rack are used up, the loading rack can be driven to rotate 180° by the first X-axis electric slide table driving the rotary cylinder in cooperation with the mounting seat, so that the previously front-loaded loading rack full of PVC base boards moves to the rear for feeding, and the previously rear-loaded loading rack moves to the front and is refilled with PVC base boards inside. By quickly switching the positions of the full and empty loading racks, production interruption is avoided, and continuous feeding without interruption is realized.

[0026] 2. The double-axis cylinder drives the mounting plate to drive the suction cup to adsorb and pick up the topmost PVC base board stacked in the loading rack; at the same time, the output end of the short-stroke cylinder drives the lower shaft rod to drive the drag buckle to turn inward, so that the PVC base board can be lifted by the drag buckle to prevent the PVC base board from falling during the movement, ensuring the stability of the PVC base board transfer process.

[0027] 3. Since the flame-retardant film conveyed between the two end conveying components is located directly below the pressing plate, after the surface-molten PVC base material plate in the positioning component is driven by the third X-axis electric sliding table to move to the pressing component, the pressing plate is driven to press down by the hydraulic cylinder driving the vertical rod, so that the pressing plate presses the flame-retardant film located below onto the PVC base material plate. At the same time, the blade is inserted into the knife groove, so as to hollow out and punch and separate the flame-retardant film pressed on the PVC base material plate from the wound flame-retardant film, realizing the synchronous completion of pressing and punching, improving the production efficiency, and moreover, it will not affect the continuous conveyance of the subsequent wound flame-retardant film. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 is a structural schematic diagram of the conveying component, the processing component and the hot melting component in the present invention;

[0030] Figure 3 is a structural schematic diagram of the feeding component in the present invention;

[0031] Figure 4 is a structural schematic diagram of the bottom of the feeding component in the present invention;

[0032] Figure 5 is a structural schematic diagram of the loading rack in the present invention;

[0033] Figure 6 is a structural schematic diagram of the handling component in the present invention;

[0034] Figure 7 is a structural schematic diagram of the conveying component and the processing component in the present invention;

[0035] Figure 8 is a sectional view of the positioning component in the present invention;

[0036] Figure 9 is a structural schematic diagram of the pressing component in the present invention;

[0037] Figure 10 is a structural schematic diagram of the hot pressing roller in the present invention.

[0038] In the figure: 1. Machine body; 2. Production mechanism; 21. Feeding component; 211. Base; 212. Vertical frame; 213. Z-axis electric slide; 214. Support plate; 215. First X-axis electric slide; 216. Rotary cylinder; 217. Mounting seat; 218. Loading rack; 219. Cavity; 22. Handling component; 221. Second X-axis electric slide; 222. Gripping part; 2221. Horizontal plate; 2222. Double-axis cylinder; 2223. Mounting plate; 2224. Suction cup; 2225. Vertical plate; 2226. Lower shaft rod; 2227. Drag hook; 2228. Upper shaft rod; 2229. Short-stroke cylinder; 23. Conveying component; 231. Shaft frame; 232. Winding roller; 233. Motor; 24. Processing component; 241. Third X-axis electric slide; 242. Positioning part; 2421. Positioning seat; 2422. Positioning groove; 2423. Tool groove; 243. Pressing component; 2431. Top plate; 2432. Vertical rod; 2433. Hydraulic cylinder; 2434. Movable plate; 2435. Pressing plate; 2436. Blade; 25. Hot melting component; 251. Horizontal frame; 252. Slide seat; 253. Hot pressing roller; 254. Long-stroke cylinder. Detailed implementation mode

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figure 1 - Figure 10 , the present invention provides a technical solution: a continuous hot compounding system for high-flame-retardant composite PVC boards, including a machine body 1, on which a production mechanism 2 is arranged and used for the hot compounding production of PVC boards. The production mechanism 2 includes:

[0041] A feeding component 21, including a base 211 fixed to the front end of the machine body 1, a vertical frame 212 fixed to the rear end of the top of the base 211, a Z-axis electric slide 213 installed inside the vertical frame 212, a support plate 214 fixed to the slider of the Z-axis electric slide 213, a first X-axis electric slide 215 installed at the front end of the top of the base 211, a rotary cylinder 216 installed on the slider of the first X-axis electric slide 215, a mounting seat 217 fixed to the output end of the rotary cylinder 216, and loading racks 218 fixed to both ends of the top of the mounting seat 217;

[0042] A handling component 22, including a second X-axis electric slide 221 installed at the upper end inside the vertical frame 212, and a gripping part 222 arranged on the slider of the second X-axis electric slide 221;

[0043] A conveying assembly 23 is provided on the machine body 1 and is used for conveying the flame retardant film.

[0044] A processing assembly 24 includes a third X-axis electric slide 241 installed on the top of the machine body 1. A positioning component 242 is provided on the slider of the third X-axis electric slide 241, and a pressing component 243 is provided on the machine body 1.

[0045] A hot melting assembly 25 is provided on the conveying assembly 23 and is used for heating and melting the surface layer of the PVC base plate.

[0046] In this embodiment, by stacking the PVC base plates in the loading rack 218 and driving the pallet 214 through the Z-axis electric slide 213 to intermittently lift the stacked PVC base plates, continuous feeding of the PVC base plates one by one is achieved; moreover, when the PVC base plates stacked in the rear loading rack 218 are used up, the first X-axis electric slide 215 can be used to drive the rotary cylinder 216 to cooperate with the mounting seat 217 to drive the loading rack 218 to rotate 180°, so that the previously front loading rack 218 full of PVC base plates moves to the rear and feeds, and the previously rear loading rack 218 moves to the front and is refilled with PVC base plates inside. By quickly switching the positions of the full and empty loading racks 218, production interruption is avoided and continuous feeding without interruption is realized.

[0047] Specifically, the grasping component 222 includes a cross plate 2221 fixed to the slider of the second X-axis electric slide 221. Vertical plates 2225 are fixed at both ends of the cross plate 2221. A lower shaft rod 2226 is rotatably installed at the lower end inside the vertical plate 2225. Drag buckles 2227 are fixed at both ends of the lower shaft rod 2226. An upper shaft rod 2228 is fixed at the upper end inside the vertical plate 2225. A short stroke cylinder 2229 is rotatably installed on the upper shaft rod 2228. The output end of the short stroke cylinder 2229 is rotatably installed with the lower shaft rod 2226.

[0048] In this embodiment, when the PVC base plate is adsorbed and picked up by the suction cup 2224, the output end of the short stroke cylinder 2229 is used to drive the lower shaft rod 2226 to drive the drag buckle 2227 to turn inward, so that the PVC base plate can be lifted by the drag buckle 2227 to prevent the PVC base plate from falling during the movement and ensure the stability of the transfer process of the PVC base plate.

[0049] Specifically, the grasping component 222 further includes a double-axis cylinder 2222 fixed to the lower end of the cross plate 2221. The output end of the double-axis cylinder 2222 is fixed with a mounting plate 2223, and suction cups 2224 are installed at the four corners of the mounting plate 2223.

[0050] In this embodiment, the double-axis cylinder 2222 drives the mounting plate 2223 to drive the suction cup 2224 to adsorb and pick up the uppermost PVC base material plate stacked in the loading rack 218. After the PVC base material plate is moved to directly above the positioning seat 2421 by the second X-axis electric slide 221, the adsorption is released, and it is placed in the positioning groove 2422 for positioning and deviation prevention.

[0051] Specifically, the positioning component 242 includes a positioning seat 2421 fixed on the slider of the third X-axis electric slide 241. A positioning groove 2422 is formed inside the positioning seat 2421, and a knife groove 2423 is formed on the outer edge of the inner part of the positioning seat 2421.

[0052] In this embodiment, since the flame-retardant film conveyed between the two conveying components 23 is located directly below the pressing plate 2435, when the third X-axis electric slide 241 drives the surface-molten PVC base material plate in the positioning component 242 to move to the pressing component 243, the hydraulic cylinder 2433 drives the vertical rod 2432 to drive the pressing plate 2435 to press down, so that the pressing plate 2435 presses the flame-retardant film located below onto the PVC base material plate.

[0053] Specifically, the pressing component 243 includes a top plate 2431 arranged above the machine body 1. Vertical rods 2432 are fixed between the four corners of the top plate 2431 and the machine body 1. A hydraulic cylinder 2433 is installed on the top of the top plate 2431. The output end of the hydraulic cylinder 2433 is fixed with a movable plate 2434, and the movable plate 2434 is slidably installed with the vertical rod 2432. A pressing plate 2435 is fixed to the bottom of the movable plate 2434, and blades 2436 are installed on the outer edge of the bottom of the pressing plate 2435.

[0054] In this embodiment, when the pressing plate 2435 presses the flame-retardant film onto the PVC base material plate, the blades 2436 are inserted into the knife groove 2423, so as to hollow out and punch and separate the flame-retardant film pressed on the PVC base material plate from the wound flame-retardant film, realizing the synchronous completion of pressing and punching, improving production efficiency, and moreover, not affecting the continuous conveying of the subsequent wound flame-retardant film.

[0055] Specifically, the conveying component 23 includes shaft frames 231 fixed at the left and right ends of the machine body 1. A winding roller 232 is rotatably installed inside the shaft frames 231, and a motor 233 is installed on the outer wall of the shaft frames 231 and is used to drive the winding roller 232 to rotate.

[0056] In this embodiment, the motor 233 drives the winding roller 232 to drive the flame-retardant film for continuous conveying, realizing the synchronous supply of the flame-retardant film and the PVC base material plate, and ensuring the continuity of production.

[0057] Specifically, the hot-melt assembly 25 includes a cross-frame 251 fixed between the left and right end shaft brackets 231. A sliding seat 252 is slidably mounted at the front end of the cross-frame 251, and three hot pressing rollers 253 are mounted at the lower end of the sliding seat 252.

[0058] In this embodiment, by setting the temperatures of the three hot pressing rollers 253 to 180 °C for preheating the material, 200 °C for deep melting, and 190 °C for stabilizing the interface respectively, the molecular chain segments in the amorphous region of PVC move more intensively, and a molten layer is formed on the surface, ensuring the best melting effect on the surface of the PVC base plate.

[0059] Specifically, a long-stroke cylinder 254 is mounted on the cross-frame 251, and the output end of the long-stroke cylinder 254 is connected to the hot pressing roller 253.

[0060] In this embodiment, the long-stroke cylinder 254 drives the sliding seat 252 to drive the three hot pressing rollers 253 to heat and melt the PVC base plate in sequence, and after the heating and melting are completed, it returns to the original position.

[0061] Specifically, the feeding assembly 21 further includes a cavity 219 opened at the bottom of the loading rack 218.

[0062] In this embodiment, when the pallet 214 lifts the PVC base plates stacked in the loading rack 218 from the bottom, unnecessary mechanical contact is avoided through the cavity 219.

[0063] The present invention also discloses a preparation method of a highly flame-retardant composite PVC board, including the following steps:

[0064] S1: First, stack the pretreated PVC base plates in the loading rack 218, and then install the flame-retardant film in the wound state between the two end conveying assemblies 23;

[0065] S2: Then, drive the pallet 214 to lift the stacked PVC base plates upward through the Z-axis electric slide 213 to achieve feeding one by one; then grab the PVC base plate through the grabbing component 222, move it to the positioning component 242 through the second X-axis electric slide 221, and heat and melt the surface of the PVC base plate in the positioning component 242 through the hot-melt assembly 25;

[0066] S3: Finally, drive the PVC base plate in the positioning component 242 to move to the pressing component 243 through the third X-axis electric slide 241, and press the flame-retardant film and the PVC base plate through the pressing component 243.

[0067] Working principle and usage process of the present invention: First, stack the PVC base plates in the loading rack 218, and drive the pallet 214 through the Z-axis electric slide table 213 to intermittently lift the stacked PVC base plates, realizing continuous and individual feeding of the PVC base plates; then drive the mounting plate 2223 through the double-axis cylinder 2222 to drive the suction cup 2224 to adsorb and pick up the topmost PVC base plate stacked in the loading rack 218; moreover, when the PVC base plate is adsorbed and picked up by the suction cup 2224, drive the lower shaft rod 2226 through the output end of the short-range cylinder 2229 to drive the drag buckle 2227 to turn inwards, so that the PVC base plate can be lifted by the drag buckle 2227 to prevent the PVC base plate from falling during movement;

[0068] Then, move the PVC base plate to directly above the positioning seat 2421 through the second X-axis electric slide table 221, release the adsorption, and place it in the positioning groove 2422 for positioning and anti-deviation; then drive the sliding seat 252 through the long-range cylinder 254 to drive the three hot pressing rollers 253 to heat and melt the PVC base plate in sequence, and after the heating and melting are completed, return to the original position;

[0069] Finally, drive the surface-melted PVC base plate in the positioning component 242 to move to the pressing component 243 through the third X-axis electric slide table 241. Since the flame-retardant film conveyed between the two end conveying components 23 is located directly below the pressing plate 2435, drive the vertical rod 2432 through the hydraulic cylinder 2433 to drive the pressing plate 2435 to press down, so that the pressing plate 2435 presses the flame-retardant film located below onto the PVC base plate; at the same time, insert the blade 2436 into the knife groove 2423, so as to hollow out and punch and separate the flame-retardant film pressed on the PVC base plate from the wound flame-retardant film, realizing the synchronous completion of pressing and punching, improving production efficiency, and not affecting the continuous conveying of the subsequent wound flame-retardant film;

[0070] When the PVC base plates stacked in the rear loading rack 218 are used up, the first X-axis electric slide table 215 can be used to drive the rotary cylinder 216 to cooperate with the mounting seat 217 to drive the loading rack 218 to rotate 180°, so that the previously full loading rack 218 located in the front moves to the rear for feeding, and the previously rear loading rack 218 moves to the front and is refilled with PVC base plates inside. By quickly switching the positions of the full and empty loading racks 218, production interruption is avoided, and continuous feeding without interruption is realized.

[0071] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0072] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous thermal composite system for a highly flame-retardant composite PVC board, comprising a machine body (1), characterized in that: A production mechanism (2) is provided on the body (1) and is used for the thermal composite production of composite PVC boards. The production mechanism (2) includes: A feeding component (21), including a base (211) fixed at the front end of the body (1). A vertical frame (212) is fixed at the rear end of the top of the base (211). A Z-axis electric slide table (213) is installed inside the vertical frame (212). A pallet (214) is fixed on the slider of the Z-axis electric slide table (213). A first X-axis electric slide table (215) is installed at the front end of the top of the base (211). A rotary cylinder (216) is installed on the slider of the first X-axis electric slide table (215). The output end of the rotary cylinder (216) is fixed with a mounting seat (217). Loading frames (218) are fixed at both ends of the top of the mounting seat (217); A handling component (22), including a second X-axis electric slide table (221) installed at the upper end inside the vertical frame (212). A grasping component (222) is arranged on the slider of the second X-axis electric slide table (221); A conveying component (23), arranged on the body (1) and used for conveying the flame-retardant film; A processing component (24), including a third X-axis electric slide table (241) installed on the top of the body (1). A positioning component (242) is arranged on the slider of the third X-axis electric slide table (241). A pressing component (243) is arranged on the body (1); A hot-melting component (25), arranged on the conveying component (23) and used for heating and melting the surface layer of the PVC base board.

2. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 1, wherein: The grasping component (222) includes a cross plate (2221) fixed on the slider of the second X-axis electric slide table (221). Vertical plates (2225) are fixed at both ends of the cross plate (2221). A lower shaft rod (2226) is rotatably installed at the lower end inside the vertical plate (2225). Drag buckles (2227) are fixed at both ends of the lower shaft rod (2226). An upper shaft rod (2228) is fixed at the upper end inside the vertical plate (2225). A short-stroke cylinder (2229) is rotatably installed on the upper shaft rod (2228). The output end of the short-stroke cylinder (2229) is rotatably installed with the lower shaft rod (2226).

3. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 2, wherein: The grasping component (222) further includes a double-axis cylinder (2222) fixed at the lower end of the cross plate (2221). The output end of the double-axis cylinder (2222) is fixed with a mounting plate (2223). Suction cups (2224) are installed at the four corners of the mounting plate (2223).

4. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 1, wherein: The positioning component (242) includes a positioning seat (2421) fixed on the slider of the third X-axis electric slide table (241). A positioning groove (2422) is opened inside the positioning seat (2421). A knife groove (2423) is opened on the outer edge inside the positioning seat (2421).

5. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 1, characterized in that: The pressing component (243) includes a top plate (2431) disposed above the machine body (1). Vertical rods (2432) are fixed between the four corners of the top plate (2431) and the machine body (1). A hydraulic cylinder (2433) is installed on the top of the top plate (2431). The output end of the hydraulic cylinder (2433) is fixed with a movable plate (2434), and the movable plate (2434) is slidably installed with the vertical rods (2432). A pressing plate (2435) is fixed to the bottom of the movable plate (2434), and blades (2436) are installed on the outer edge of the bottom of the pressing plate (2435).

6. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 1, characterized in that: The conveying component (23) includes shaft brackets (231) fixed to the left and right ends of the machine body (1). A winding roller (232) is rotatably installed inside the shaft brackets (231). A motor (233) is installed on the outer wall of the shaft brackets (231) and is used to drive the winding roller (232) to rotate.

7. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 6, wherein: The hot-melt component (25) includes a cross frame (251) fixed between the shaft brackets (231) at the left and right ends. A sliding seat (252) is slidably installed at the front end of the cross frame (251). Three hot pressing rollers (253) are installed at the lower end of the sliding seat (252).

8. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 7, characterized in that: A long-stroke cylinder (254) is installed on the cross frame (251), and the output end of the long-stroke cylinder (254) is connected to the hot pressing roller (253).

9. The continuous thermal composite system of a highly flame-retardant composite PVC board according to claim 1, wherein: The feeding component (21) further includes a cavity (219) opened at the bottom of the loading rack (218).

10. A preparation method of a highly flame-retardant composite PVC board, characterized in that: The continuous heat compounding system for the highly flame-retardant composite PVC board according to any one of claims 1-9 specifically includes the following steps: S1: First, stack the pretreated PVC base boards in the loading rack (218), and then install the flame-retardant film in the winding state between the conveying components (23) at both ends; S2: Then, drive the pallet (214) to lift the stacked PVC base boards upward through the Z-axis electric slide table (213) to achieve feeding one by one; then grab the PVC base boards through the grabbing component (222), move them to the positioning component (242) through the second X-axis electric slide table (221), and heat and melt the surface of the PVC base boards in the positioning component (242) through the hot-melt component (25); S3: Finally, drive the PVC base boards in the positioning component (242) to move into the pressing component (243) through the third X-axis electric slide table (241), and press the flame-retardant film and the PVC base boards through the pressing component (243).

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