Processing and polishing equipment for anti-static flame-retardant PVC (polyvinyl chloride) plate

Abstract

The embodiment of the invention provides processing and polishing equipment for an anti-static flame-retardant PVC plate, and relates to the technical field of plate processing. Processing and polishing equipment for anti-static flame-retardant PVC plates comprises a conveying frame, PVC plastic plates are conveyed on the conveying frame, a fixing frame is fixedly connected to the center of the bottom of the conveying frame, fixing cylinders are fixedly connected to the two sides, close to the fixing frame, of the conveying frame, and transverse grooves are formed in the two sides of each fixing cylinder; one side of the fixing frame is fixedly connected with a pressurizing frame, the other side of the fixing frame is fixedly connected with a negative pressure frame, and an inner cavity of the fixing frame is provided with a fine grinding assembly matched with the PVC plastic plate on the conveying frame in a polishing mode. A first displacement assembly and a spraying assembly which are used in cooperation with the fixing barrel are arranged on the side, close to the pressurizing frame, of the conveying frame. Based on the condition of spraying the polishing agent, a reciprocating accurate grinding mode is matched, the efficient and uniform polishing effect on the PVC plastic plate is achieved, and the polishing quality of the PVC plastic plate is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plate processing, and particularly relates to a processing and polishing device for anti-static and flame-retardant PVC plate. BACKGROUND

[0002] PVC plate, full name polyvinyl chloride plate, is an elastic floor decoration material made of polyvinyl chloride (PVC) resin as the main raw material, adding plasticizer, stabilizer, pigment and other auxiliary materials, through calendering processing, coating processing and laminating processing technology, and is divided into two categories of coiled material and sheet material (lock type, self-adhesive type), and generally has wear resistance.

[0003] In the prior art (patent application with the patent name of PVC coiled material plate surface polishing and grinding equipment and the announcement number of CN213319486U), the production efficiency is improved, the tensioning force is adjusted according to the demand through the tensioning device, and the coiled material is straightened to facilitate polishing and polishing. In the process of realizing the technical scheme, it is found that at least the problem of low polishing and polishing exists in the prior art.

[0004] During the processing of PVC plastic plate, the surface needs to be polished for subsequent spraying of various coatings. At present, the polishing method for PVC plastic plate mostly only uses the friction force carried by the roller to polish the PVC plastic plate. Only relying on the friction between the roller and the PVC plastic plate, the effect is not good. If the roller and the PVC plastic plate are not attached in place, the PVC plastic plate is not polished sufficiently. If the roller and the PVC plastic plate are attached too tightly, the PVC plastic plate is easily over-polished. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the prior art that cannot realize efficient and uniform polishing effect of PVC plastic plate based on the condition of spraying polishing agent and matching reciprocating fine grinding method, and reduce the polishing quality of PVC plastic plate. To this end, the present application provides a processing and polishing device for anti-static and flame-retardant PVC plate.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the present application is as follows:

[0007] A processing and polishing device for anti-static and flame-retardant PVC sheets includes a transmission frame on which PVC sheets are transported. A fixed frame is fixedly connected to the center of the bottom of the transmission frame. Fixed cylinders are fixedly connected to both sides of the transmission frame near the fixed frame, and horizontal grooves are opened on both sides of the fixed cylinders. A pressure boosting frame is fixedly connected to one side of the fixed frame, and a negative pressure frame is fixedly connected to the other side of the fixed frame. The inner cavity of the fixed frame is provided with a fine grinding component that cooperates with the polishing of the PVC sheets on the transmission frame. The fine grinding component includes a servo motor fixed to the center of the bottom of the fixed frame and a turntable frame fixed to the output shaft of the servo motor.

[0008] A round protrusion is fixedly connected to one side of the top of the turntable frame, and a swing frame is slidably connected to the round protrusion. A servo motor provides a unified drive source. A connecting frame is fixedly connected to the outer side of the swing frame, and a drive motor is fixedly connected to the top array of the connecting frame. The output shaft of the drive motor is fixedly connected to a polishing disc that cooperates with the polishing of PVC plastic sheets. The polishing disc adopts a design with smaller sides and a larger middle, and the horizontal polishing area of ​​the polishing disc is larger than the width of the polishing area of ​​the PVC plastic sheet. The swing frame drives the polishing disc on the drive motor through the connecting frame to achieve an efficient and fine polishing effect on the passing PVC plastic sheets. This is to prevent the PVC plastic sheets from being under-polished or over-polished, improve the polishing quality of the PVC plastic sheets, and facilitate the subsequent spraying of various coatings.

[0009] The transfer frame is provided with a first displacement component and a spraying component on the side near the pressure booster frame, which are used in conjunction with the fixed cylinder and are used for the polishing agent spraying of PVC plastic sheets at the material loading point of the transfer frame. The first displacement component includes a belt groove opened at the outer end of the turntable frame and a synchronous belt driven in the belt groove. The spraying component includes a pressure boosting channel connecting both sides of the pressure booster frame.

[0010] The belt groove on the turntable is connected to a first synchronous pulley via a synchronous belt drive. The top of the first synchronous pulley is fixedly connected to a first main bevel gear via a rotating rod. A first secondary bevel gear meshes with the outer side of the first main bevel gear. A first reciprocating screw is fixedly connected to the inner cavity of the first secondary bevel gear and rotates with the fixed cylinder. A first screw sleeve is threaded onto the first reciprocating screw. Both sides of the first screw sleeve are fixedly connected to a first rectangular frame that slides with the transverse groove. The first screw sleeve drives the first rectangular frame to move back and forth along the PVC plastic sheet area at the material loading point of the transmission frame, which facilitates the subsequent spraying of polishing agent onto the PVC plastic sheet area at the material loading point of the transmission frame.

[0011] The bottom of the first synchronous pulley is fixedly connected to an exhaust fan for use with the booster frame and booster channel via a rotating rod. The outer side of the booster channel is connected to a first telescopic tube. The outer end of the first telescopic tube is connected to a booster tube that is fixedly matched with the first rectangular frame. The inner end of the booster tube is connected to a five-way valve. The top of the five-way valve is connected to a liquid reservoir. Both ends of the five-way valve are connected to booster angle tubes that are embedded and matched with the first rectangular frame. The polishing agent in the liquid reservoir also reaches the five-way valve. Under the action of the air pressure, the polishing agent in the five-way valve is forced through the two booster angle tubes. The bottom end of the booster angle tube is connected to a spray frame. The bottom of the spray frame is arrayed with atomizing micro-holes for spraying polishing agent onto PVC plastic sheets. This is used to uniformly and comprehensively atomize and spray polishing agent onto the PVC plastic sheet area at the material loading point of the conveyor frame, improving the polishing quality of the PVC plastic sheet while also providing lubrication and protection for the PVC plastic sheet.

[0012] Preferably, stepper motors are fixedly connected to both sides of the center of the back of the transmission frame, and the output shaft of the stepper motor is fixedly connected to a polishing roller that has been pre-polished with the PVC plastic sheet. The stepper motor drives the polishing roller to perform auxiliary polishing treatment on the PVC plastic sheet during the transmission process.

[0013] Preferably, one side of the transmission frame is rotatably connected to a tensioning roller for adjusting the tension of the PVC plastic sheet, which provides a low-speed transmission function for orderly tensioning of the PVC plastic sheet. The other side of the transmission frame 1 is rotatably connected to a dust-adhesive roller for adhering to impurities on the PVC plastic floor 2, which helps to collect and adhere impurities after polishing.

[0014] Preferably, the transmission frame is provided with T-shaped slide rails on both the front and rear sides near the fixed frame, and the inner cavity of the T-shaped slide rail is slidably connected with a T-shaped slide rail block that is fixedly matched with the connecting frame. This serves to limit the sliding of the connecting frame and also improves the stability of the horizontal reciprocating movement of the connecting frame, so as to prevent the connecting frame and its components from shaking or tilting.

[0015] Preferably, the transmission frame has a first T-shaped groove on both the front and rear sides near the first rectangular frame, and the inner cavity of the first T-shaped groove is slidably connected to a first T-shaped slider that is fixedly matched with the first rectangular frame, which is used to limit the sliding of the first rectangular frame to prevent the first rectangular frame and its components from shaking or tilting.

[0016] Preferably, the side of the transmission frame near the negative pressure frame is provided with a second displacement component and a negative pressure component for use with the fixed cylinder, and is used for dust collection, cleaning and drying of PVC plastic sheets at the unloading point of the transmission frame. The second displacement component includes a second synchronous pulley connected to the other side by a synchronous belt in the belt groove. The bottom of the second synchronous pulley is fixedly connected to a dust suction fan for use with the negative pressure frame by a rotating rod. The turntable frame drives the second synchronous pulley to rotate by the synchronous belt in the belt groove. The second synchronous pulley drives the dust suction fan to rotate in the negative pressure frame and generate negative pressure suction by the rotating rod.

[0017] Preferably, a second main bevel gear is fixedly connected to the top of the second synchronous pulley via a rotating rod. A second auxiliary bevel gear meshes with the outer side of the second main bevel gear, and a second reciprocating screw that rotates with the fixed cylinder is fixedly connected to the outer side of the second auxiliary bevel gear. A second screw sleeve is threaded onto the second reciprocating screw, and a second rectangular frame that slides with the transverse groove is fixedly connected to both sides of the second screw sleeve. The second synchronous pulley also drives the second main bevel gear and the second auxiliary bevel gear to rotate successively. The second auxiliary bevel gear drives the second screw sleeve to move horizontally back and forth via the second reciprocating screw, and the second screw sleeve drives the second rectangular frame to move horizontally back and forth.

[0018] Preferably, the transmission frame 1 has a second T-shaped groove on both the front and rear sides near the second rectangular frame, and the inner cavity of the second T-shaped groove is slidably connected to a second T-shaped slider that is fixedly matched with the second rectangular frame, which plays a role in sliding and limiting the horizontal back-and-forth displacement of the second rectangular frame.

[0019] Preferably, the negative pressure assembly includes negative pressure channels connecting both sides of the negative pressure frame, with a second telescopic tube connected to the outer side of the negative pressure channel, a negative pressure pipe connected to the outer end of the second telescopic tube, and a four-way valve connected to the inner end of the negative pressure pipe. Both ends of the four-way valve are connected to negative pressure angle tubes that are embedded and cooperate with the second rectangular frame, and the bottom end of the negative pressure angle tube is connected to a dust collection frame for cleaning PVC plastic sheets at the unloading point of the transfer frame. The negative pressure suction generated in the negative pressure frame passes through the two sets of negative pressure channels and the second telescopic tube through the negative pressure angle tubes at both ends of the four-way valve to the dust collection frame, where impurities and dust on the polished PVC plastic sheets are collected by negative pressure adsorption, then returned along the same path and discharged to the dust collection tank for temporary storage through the dust discharge channel for subsequent unified cleaning. Both sides of the dust collection frame are fixedly connected to heating lamps for drying and heating PVC plastic sheets at the unloading point of the transfer frame. At the same time, the heating lamps that move horizontally back and forth with the dust collection frame also heat and dry the PVC plastic sheets that have been soaked in polishing agent, which is beneficial for subsequent work.

[0020] Preferably, the inner cavity of the PVC plastic sheet is provided with a substrate layer, a reinforcing layer, a plastic layer, an antistatic layer and a flame retardant layer, and the reinforcing layer is made of warp and weft yarns woven together, and the ends of the warp and weft yarns are sealed with flexible material.

[0021] The processing and polishing equipment for anti-static and flame-retardant PVC sheets of the present invention has the following advantages:

[0022] 1. This processing and polishing equipment for anti-static and flame-retardant PVC sheets, during the polishing of PVC plastic sheets, firstly, a servo motor provides a unified drive source, saving power costs, while the round convex head on the turntable drives the swing frame to swing horizontally back and forth. The swing frame drives the polishing disc on the drive motor through the connecting frame to achieve a highly efficient and fine polishing effect on the passing PVC plastic sheets, so as to avoid the PVC plastic sheets being under-polished or over-polished, improve the polishing quality of PVC plastic sheets, facilitate the subsequent spraying of various coatings, and provide a guarantee for the overall quality of PVC plastic sheets.

[0023] 2. In this processing and polishing equipment for anti-static and flame-retardant PVC sheets, the first synchronous pulley is driven to rotate synchronously by the synchronous belt in the belt groove of the turntable frame. The first synchronous pulley drives the first main bevel gear and the first secondary bevel gear to rotate successively through the rotating rod. The first secondary bevel gear drives the first screw sleeve on the first reciprocating screw to move back and forth horizontally. The first screw sleeve drives the first rectangular frame to move back and forth along the PVC plastic sheet area at the material loading point of the transmission frame, which facilitates the subsequent spraying of polishing agent on the PVC plastic sheet area at the material loading point of the transmission frame.

[0024] 3. This processing and polishing equipment for anti-static and flame-retardant PVC sheets, simultaneously, the first synchronous wheel drives the exhaust fan to rotate within the pressure boosting frame via the rotating rod, generating air pressure. The air pressure generated within the pressure boosting frame is pressurized through the first telescopic pipes on the two sets of pressure boosting channels and supplied into the two pressure boosting pipes. The further pressurized air pressure converges into the five-way valve, and at the same time, the polishing agent in the storage tank also reaches the five-way valve. Under the action of the air pressure, the polishing agent in the five-way valve is forced to be atomized and sprayed through the two pressure boosting angle pipes and the atomizing micro-holes on the spraying frame onto the PVC plastic sheet area at the material loading point of the transfer frame. This improves the polishing quality of the PVC plastic sheet while also providing lubrication and protection for the PVC plastic sheet. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an initial state diagram of the processing and polishing equipment for antistatic and flame-retardant PVC sheets according to the present invention;

[0027] Figure 2 This is a diagram illustrating the working state of a processing and polishing equipment for antistatic and flame-retardant PVC sheets according to the present invention.

[0028] Figure 3 This is a partial sectional view of the structure of a processing and polishing equipment for antistatic and flame-retardant PVC sheets according to the present invention;

[0029] Figure 4 This is a partial internal view of the structure of a processing and polishing equipment for antistatic and flame-retardant PVC sheets according to the present invention;

[0030] Figure 5 This is a partial side cross-sectional view of the transmission frame and fine grinding assembly structure of the present invention;

[0031] Figure 6 This is a diagram showing the working state of the precision grinding component structure of the present invention;

[0032] Figure 7 This is an exploded bottom view of the structure of the precision grinding component of the present invention;

[0033] Figure 8 This is a partial cross-sectional view of the initial state of the grinding assembly, the first displacement assembly, the spraying assembly, and the pressure booster frame structure of the present invention.

[0034] Figure 9 This is a partial cross-sectional view of the working state of the fine grinding component, the first displacement component, the spraying component, and the pressure booster frame structure of the present invention.

[0035] Figure 10 This is a partial top cross-sectional view of the structure of the fine grinding component, the first displacement component, the spraying component, and the pressure booster frame of the present invention;

[0036] Figure 11 This is a partial bottom view of the structure of the first displacement component and the spraying component of the present invention;

[0037] Figure 12 This is a partial cross-sectional view of the initial state of the fine grinding component, the second displacement component, the negative pressure component, and the negative pressure frame structure of the present invention.

[0038] Figure 13 This is a partial cross-sectional view of the working state of the fine grinding component, the second displacement component, the negative pressure component, and the negative pressure frame structure of the present invention.

[0039] Figure 14 This is a top sectional view of the structure of the fine grinding component, the second displacement component, the negative pressure component, the negative pressure frame, the dust discharge channel, and the dust collection tank of the present invention.

[0040] Figure 15 This is a partial bottom view of the structure of the second displacement component and the negative pressure component of the present invention;

[0041] Figure 16This is a partial bottom view of the negative pressure component structure of the present invention;

[0042] Figure 17 This is an exploded view of the transmission frame, fixing frame, fixing cylinder, pressure boosting frame, and negative pressure frame of the present invention;

[0043] Figure 18 This is a partial cross-sectional view of the PVC plastic sheet structure of the present invention;

[0044] Figure 19 This is a partial top view of the reinforcing layer structure of the present invention.

[0045] Explanation of markings in the diagram: 1. Transmission frame; 2. PVC plastic sheet; 3. Fixing frame; 4. Fixing cylinder; 5. Pressure boosting frame; 6. Negative pressure frame; 71. Servo motor; 72. Turntable frame; 73. Round convex head; 74. Swing frame; 75. Connecting frame; 76. Drive motor; 77. Polishing disc; 81. Belt groove; 82. First synchronous pulley; 83. First main bevel gear; 84. First auxiliary bevel gear; 85. First reciprocating lead screw; 86. First lead screw sleeve; 87. First rectangular frame; 91. Exhaust fan; 92. Pressure boosting channel; 93. First telescopic tube; 94. Pressure boosting tube; 95. Five-way valve; 96. Liquid reservoir; 97. Pressure boosting angle tube; 101. Second synchronous pulley; 102. Vacuum fan; 103. Second main bevel gear; 104. Second auxiliary bevel gear; 105. 106. Second reciprocating lead screw; 107. Second lead screw sleeve; 118. Second rectangular frame; 119. Negative pressure channel; 110. Second telescopic tube; 111. Negative pressure tube; 112. Four-way valve; 113. Negative pressure angle tube; 114. Dust collection frame; 115. Heating lamp; 12. T-shaped slide rail; 13. T-shaped slide rail block; 14. First T-shaped slide groove; 15. First T-shaped slider; 16. Spraying frame; 17. Atomizing micro-holes; 18. Stepper motor; 19. Grinding roller; 20. Tensioning roller; 21. Dust-adhesive roller; 22. Dust discharge channel; 23. Dust collection tank; 24. Second T-shaped slide groove; 25. Second T-shaped slider; 26. Substrate layer; 27. Reinforcing layer; 28. Plastic layer; 29. ​​Antistatic layer; 30. Flame retardant layer; 31. Warp yarn; 32. Weft yarn; 33. Edge sealing end. Detailed Implementation

[0046] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element 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.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figures 1-19As shown, the present invention discloses a processing and polishing device for anti-static and flame-retardant PVC sheets, comprising a transmission frame 1, on which PVC plastic sheets 2 are conveyed, and a fixed frame 3 is fixedly connected to the center of the bottom of the transmission frame 1. Fixed cylinders 4 are fixedly connected to both sides of the transmission frame 1 near the fixed frame 3, and horizontal grooves are opened on both sides of the fixed cylinders 4. Stepper motors 18 are fixedly connected to both sides of the center of the back of the transmission frame 1, and the output shaft of the stepper motor 18 is fixedly connected to a polishing roller 19 that is pre-polished with the PVC plastic sheet 2. The stepper motor 18 drives the polishing roller 19 to perform auxiliary polishing treatment on the PVC plastic sheet 2 during the conveying process. A tensioning roller 20 is rotatably connected to one side of the transmission frame 1 to adjust the tension of the PVC plastic sheet 2, which plays a role in the low-speed transmission of the PVC plastic sheet 2 with orderly tension. A dust-adhesive roller 21 is rotatably connected to the other side of the transmission frame 1 to adhere to impurities on the PVC plastic sheet 2, which achieves the effect of auxiliary adhesion and collection on the polished PVC plastic sheet 2.

[0050] A pressure booster frame 5 is fixedly connected to one side of the fixed frame 3, and a negative pressure frame 6 is fixedly connected to the other side of the fixed frame 3. A dust discharge channel 22 is connected to the outside of the negative pressure frame 6, and a dust collection tank 23 with a one-way valve is connected to the outside of the dust discharge channel 22. Impurities and dust collected under negative pressure are discharged into the dust collection tank 23 through the dust discharge channel 22 for subsequent unified cleaning. The inner cavity of the fixed frame 3 is equipped with a fine grinding component that cooperates with the polishing of the PVC plastic sheet 2 on the transmission frame 1. The fine grinding component includes a servo motor 71 fixed at the bottom center of the fixed frame 3 and a turntable frame 72 fixed on the output shaft of the servo motor 71. It achieves efficient and fine polishing effect on the PVC plastic sheet 2, so as to avoid the PVC plastic sheet 2 being under-polished or over-polished, and improves the polishing quality of the PVC plastic sheet 2.

[0051] The side of the transfer frame 1 near the pressure booster frame 5 is equipped with a first displacement component and a spraying component that work in conjunction with the fixed cylinder 4. These components are used for spraying polishing agent onto the PVC plastic sheet 2 at the loading point of the transfer frame 1. The first displacement component includes a belt groove 81 located at the outer end of the turntable frame 72 and a synchronous belt driven within the belt groove 81. The belt groove 81 moves back and forth along the PVC plastic sheet 2 area at the loading point of the transfer frame 1, facilitating the subsequent spraying of polishing agent onto the PVC plastic sheet 2 area at the loading point of the transfer frame 1. The spraying component includes a pressure boosting channel 92 connecting both sides of the pressure booster frame 5. The polishing agent is atomized and sprayed onto the PVC plastic sheet 2 area at the loading point of the transfer frame 1 through the atomizing micro-holes 17 on the spraying frame 16. This improves the polishing quality of the PVC plastic sheet 2 and also provides lubrication and protection for the PVC plastic sheet 2.

[0052] like Figures 5-11As shown, a round protrusion 73 is fixedly connected to one side of the top of the turntable frame 72, and a swing frame 74 is slidably connected to the round protrusion 73. The servo motor 71 provides a unified drive source, saving power costs. The round protrusion 73 on the turntable frame 72 drives the swing frame 74 to swing horizontally back and forth. A connecting frame 75 is fixedly connected to the outside of the swing frame 74, and a drive motor 76 is fixedly connected to the top array of the connecting frame 75. The output shaft of the drive motor 76 is fixedly connected to a polishing disc 77 that cooperates with the polishing of the PVC plastic sheet 2. The polishing disc 77 adopts a design with small sides and a large middle. The horizontal polishing area of ​​the polishing disc 77 is larger than the width of the polishing area of ​​the PVC plastic sheet 2. The swing frame 74 drives the polishing disc 77 on the drive motor 76 through the connecting frame 75 to achieve an efficient and fine polishing effect on the PVC plastic sheet 2, so as to avoid the PVC plastic sheet 2 being under-polished or over-polished, improve the polishing quality of the PVC plastic sheet 2, facilitate the subsequent spraying of various coatings, and ensure the overall quality of the PVC plastic sheet 2.

[0053] T-shaped slide rails 12 are provided on both the front and rear sides of the transmission frame 1 near the fixed frame 3. The inner cavity of the T-shaped slide rail 12 is slidably connected to a T-shaped slide rail block 13 that is fixedly matched with the connecting frame 75. This serves to limit the sliding of the connecting frame 75 and also improves the stability of the horizontal reciprocating motion of the connecting frame 75, so as to prevent the connecting frame 75 and its components from shaking or tilting.

[0054] The belt groove 81 on the turntable frame 72 is connected to the first synchronous pulley 82 via a synchronous belt drive. The synchronous belt in the belt groove 81 on the turntable frame 72 drives the first synchronous pulley 82 to rotate synchronously. The top of the first synchronous pulley 82 is fixedly connected to the first main bevel gear 83 via a rotating rod. The outer side of the first main bevel gear 83 meshes with the first secondary bevel gear 84. The first synchronous pulley 82 drives the first main bevel gear 83 and the first secondary bevel gear 84 to rotate successively via the rotating rod. The inner cavity of the first secondary bevel gear 84 is fixedly connected to a component that rotates with the fixed cylinder 4. The first reciprocating lead screw 85 is threadedly connected to the first lead screw sleeve 86. The first bevel gear 84 drives the first lead screw sleeve 86 on the first reciprocating lead screw 85 to move back and forth horizontally. Both sides of the first lead screw sleeve 86 are fixedly connected to the first rectangular frame 87 that slides with the transverse groove. The first lead screw sleeve 86 drives the first rectangular frame 87 to move back and forth along the PVC plastic sheet 2 area at the feeding point of the transmission frame 1, which facilitates the subsequent spraying of polishing agent on the PVC plastic sheet 2 area at the feeding point of the transmission frame 1.

[0055] The transmission frame 1 has a first T-shaped groove 14 on both the front and rear sides near the first rectangular frame 87, and the inner cavity of the first T-shaped groove 14 is slidably connected to a first T-shaped slider 15 that is fixedly matched with the first rectangular frame 87, which plays a sliding limit role for the first rectangular frame 87 to prevent the first rectangular frame 87 and its components from shaking or tilting.

[0056] The bottom of the first synchronous pulley 82 is fixedly connected to an exhaust fan 91, which is used in conjunction with the booster frame 5 and the booster channel 92, via a rotating rod. The first synchronous pulley 82 also drives the exhaust fan 91 to rotate within the booster frame 5 and generate air pressure. The outer side of the booster channel 92 is connected to a first telescopic pipe 93, and the outer end of the first telescopic pipe 93 is connected to a booster pipe 94, which is fixedly fitted with the first rectangular frame 87. The air pressure generated within the booster frame 5 is pressurized by the first telescopic pipes 93 on the two sets of booster channels 92 and supplied to the two booster pipes 94. The inner end of the booster pipe 94 is connected to a five-way valve 95, which supplies air to the two booster pipes 94. The air pressure after further pressurization converges into the five-way valve 95. The top of the five-way valve 95 is connected to the liquid reservoir 96, and both ends of the five-way valve 95 are connected to the pressure boosting angle tubes 97 that are embedded and matched with the first rectangular frame 87. The polishing agent in the liquid reservoir 96 also reaches the five-way valve 95. Under the action of the air pressure, the polishing agent in the five-way valve 95 is forced to be atomized and sprayed through the two pressure boosting angle tubes 97 and through the atomizing micro-holes 17 on the spray frame 16 to the PVC plastic sheet 2 area at the material loading point of the transfer frame 1. This improves the polishing quality of the PVC plastic sheet 2 and also provides lubrication and protection for the PVC plastic sheet 2.

[0057] The bottom end of the pressure-boosting angle tube 97 is connected to the spraying rack 16, and the bottom array of the spraying rack 16 has atomizing micro-holes 17 for spraying polishing agent onto the PVC plastic sheet 2. The polishing agent is evenly and comprehensively sprayed onto the area of ​​the PVC plastic sheet 2 at the feeding point of the transfer rack 1, which improves the polishing quality of the PVC plastic sheet 2 and also provides lubrication and protection for the PVC plastic sheet 2.

[0058] like Figures 12-16 As shown, after the PVC plastic sheet 2 is polished, most of the impurities and dust accumulated on it are collected and cleaned manually, which is time-consuming, troublesome and inefficient. The side of the transmission frame 1 near the negative pressure frame 6 is equipped with a second displacement component and a negative pressure component that are used in conjunction with the fixed cylinder 4. These components are used for dust collection, cleaning and drying of the PVC plastic sheet 2 at the unloading point of the transmission frame 1. The second displacement component includes a second synchronous wheel 101 that is connected to the other side by a synchronous belt in the belt groove 81. The bottom of the second synchronous wheel 101 is fixedly connected to a dust suction fan 102 that is used in conjunction with the negative pressure frame 6 by a rotating rod. The turntable frame 72 drives the second synchronous wheel 101 to rotate through the synchronous belt in the belt groove 81. The second synchronous wheel 101 drives the dust suction fan 102 to rotate in the negative pressure frame 6 and generate negative pressure suction through the rotating rod.

[0059] Furthermore, the top of the second synchronous pulley 101 is fixedly connected to the second main bevel gear 103 via a rotating rod. The outer side of the second main bevel gear 103 meshes with the second auxiliary bevel gear 104, and the outer side of the second auxiliary bevel gear 104 is fixedly connected to the second reciprocating lead screw 105, which rotatably engages with the fixed cylinder 4. The second reciprocating lead screw 105 is threadedly connected to the second lead screw sleeve 106, and both sides of the second lead screw sleeve 106 are fixedly connected to the second rectangular frame 107, which slides with the transverse groove. The second synchronous pulley 101 also drives the second main bevel gear 103 and the second auxiliary bevel gear 104. The secondary bevel gear 104 rotates in succession. The second secondary bevel gear 104 drives the second screw sleeve 106 to move back and forth horizontally through the second reciprocating screw 105. The second screw sleeve 106 drives the second rectangular frame 107 to move back and forth horizontally. The transmission frame 1 is provided with a second T-shaped slide groove 24 on both the front and rear sides near the second rectangular frame 107. The inner cavity of the second T-shaped slide groove 24 is slidably connected to a second T-shaped slider 25 that is fixedly matched with the second rectangular frame 107, which plays a sliding limit role for the horizontally moving second rectangular frame 107.

[0060] The negative pressure assembly includes negative pressure channels 111 connecting both sides of the negative pressure frame 6. A second telescopic tube 112 connects to the outer side of each negative pressure channel 111. A negative pressure pipe 113 connects to the outer end of the second telescopic tube 112, and a four-way valve 114 connects to the inner end of the negative pressure pipe 113. Both ends of the four-way valve 114 are connected to negative pressure angle tubes 115 that are fitted into the second rectangular frame 107. The bottom end of the negative pressure angle tube 115 connects to a dust collection frame 116 for cleaning the PVC plastic sheet 2 at the unloading point of the transfer frame 1. The negative pressure suction generated within the negative pressure frame 6 is sequentially generated by the two sets of negative pressure channels 111 and the second telescopic tube 112. Pipe 112 passes through the negative pressure angle tubes 115 at both ends of the four-way valve 114 to reach the dust collection rack 116, where it uses negative pressure to adsorb and collect impurities and dust on the polished PVC plastic sheet 2. After returning along the same route, it is discharged through the dust discharge channel 22 to the dust collection tank 23 for temporary storage, so as to facilitate subsequent unified cleaning. Both sides of the dust collection rack 116 are fixedly connected with heating lamps 117 for drying and heating the PVC plastic sheet 2 at the unloading point of the transfer rack 1. At the same time, the heating lamps 117, which move horizontally back and forth with the dust collection rack 116, also heat and dry the PVC plastic sheet 2 after it is soaked in polishing agent, which is beneficial to subsequent work.

[0061] like Figures 18-19As shown, an antistatic and flame-retardant PVC sheet is provided. According to a processing and polishing device for antistatic and flame-retardant PVC sheets, the inner cavity of the PVC sheet 2 is respectively provided with a base layer 26, a reinforcing layer 27, a plastic layer 28, an antistatic layer 29, and a flame-retardant layer 30. This gives the PVC sheet 2 high strength, antistatic properties, and flame-retardant properties, extending the service life of the PVC sheet 2. The reinforcing layer 27 is made of warp yarns 31 and weft yarns 32 woven together to enhance the tear resistance of the PVC sheet 2. The ends of the warp yarns 31 and weft yarns 32 are sealed with flexible material to protect the ends of the warp yarns 31 and weft yarns 32, preventing the edges of the reinforcing layer 27 from being damaged or loosened under stress, thus extending the service life of the PVC sheet 2 and making it more cost-effective and competitive in the market.

[0062] The working principle of a processing and polishing equipment for anti-static and flame-retardant PVC sheets is as follows: First, the PVC plastic sheet 2 is tensioned and conveyed at a low speed through the tensioning rollers 20 on both sides of the transmission frame 1. At the same time, the servo motor 71 is turned on and drives the swing frame 74 to swing horizontally back and forth through the round protrusion 73 on the turntable frame 72. Under the sliding limit cooperation of the T-shaped slide rail 12 and the T-shaped slide rail block 13 on the connecting frame 75, the horizontally reciprocating swing frame 74 drives the polishing disc 77 on the drive motor 76 to move back and forth in the PVC plastic sheet 2 area in the middle of the transmission frame 1 through the connecting frame 75. The drive motor 76 is turned on and drives the polishing disc 77 to perform back and forth fine grinding and polishing on the PVC plastic sheet 2. At the same time, the two sets of stepper motors 18 are turned on and drive the two grinding rollers 19 to perform front and rear auxiliary grinding on the PVC plastic sheet 2 until the PVC plastic sheet 2 is polished.

[0063] Prior to this, the synchronous belt in the belt groove 81 on the turntable frame 72 drives the first synchronous pulley 82 and the second synchronous pulley 101 to rotate synchronously. The first synchronous pulley 82 drives the first main bevel gear 83 to rotate through the rotating rod. The first main bevel gear 83 drives the first reciprocating screw 85 on the first auxiliary bevel gear 84 to rotate successively. The first reciprocating screw 85 drives the first screw sleeve 86 to move back and forth horizontally. With the sliding support of the first T-shaped slide groove 14 and the first T-shaped slider 15 on the first rectangular frame 87, the horizontally moving first screw sleeve 86 also drives the first rectangular frame 87 to move accordingly. The first rectangular frame 87 drives the liquid storage tank 96 and the spray frame 16 to move back and forth horizontally along the PVC plastic sheet 2 area at the loading point of the transfer frame 1 through the five-way valve 95 and the pressure angle tube 97 on the two pressure tubes 94, and forces the two first telescopic tubes 93 to perform back and forth telescopic movements.

[0064] At the same time, the first synchronous wheel 82 drives the exhaust fan 91 to rotate in the pressure booster frame 5 through the rotating rod and generates wind pressure. The wind pressure generated in the pressure booster frame 5 is supplied to the two pressure booster pipes 94 through the first telescopic pipe 93 on the two sets of pressure booster channels 92, and then pressurized and converged into the five-way valve 95. At the same time, the polishing agent in the liquid reservoir 96 also reaches the five-way valve 95. Under the action of wind pressure, the polishing agent in the five-way valve 95 reaches the spraying frame 16 through the two pressure booster angle pipes 97. Then, the polishing agent is sprayed by the atomizing micro-holes 17 that move back and forth horizontally along the PVC plastic sheet 2 area at the loading point of the transfer frame 1, so that the polishing agent is evenly and comprehensively attached to the area to be polished of the PVC plastic sheet 2. After the PVC plastic sheet 2 is conveyed to the working range of the polishing disc 77, the polishing disc 77, which moves back and forth horizontally, performs efficient polishing on the PVC plastic sheet 2 after the polishing agent is sprayed, and also provides lubrication and protection measures for the PVC plastic sheet 2 in the polishing state.

[0065] At the same time, the second synchronous wheel 101 drives the vacuum fan 102 to rotate in the negative pressure frame 6 through the rotating rod and generates negative pressure suction. The second synchronous wheel 101 also drives the second main bevel gear 103 to rotate through the rotating rod. The second main bevel gear 103 drives the second reciprocating screw 105 on the second auxiliary bevel gear 104 to rotate successively. The second reciprocating screw 105 drives the second screw sleeve 106 to move back and forth horizontally. With the sliding support of the second T-shaped slide groove 24 and the second T-shaped slider 25 on the second rectangular frame 107, the second screw sleeve 106 drives the second rectangular frame 107 to move back and forth horizontally. The horizontal back and forth displacement drives the vacuum frame 116 and the heating lamp 117 to move back and forth horizontally along the PVC plastic sheet 2 area at the material unloading point of the transmission frame 1 through the two negative pressure pipes 113 and the negative pressure angle pipes 115 at both ends of the four-way valve 114, and forces the two second telescopic pipes 112 to perform back and forth telescopic movements.

[0066] The negative pressure suction generated inside the negative pressure frame 6 is supplied to two negative pressure pipes 113 through the second telescopic pipes 112 on the two sets of negative pressure channels 111, and then converges and is supplied to the four-way valve 114. After passing through two negative pressure angle pipes 115, it is conducted to the dust collection frame 116. Under the action of negative pressure suction, the dust collection frame 116, which moves back and forth horizontally, adsorbs and collects the impurities and dust accumulated on the PVC plastic sheet 2 at the unloading point of the transmission frame 1 after polishing. Then it returns along the same route and is discharged into the dust collection tank 23 through the dust discharge channel 22 for temporary storage. The dust sticking roller 21 assists in adhering and collecting the impurities and dust accumulated on the PVC plastic sheet 2 that it passes through. At the same time, the heating lamp 117, which moves back and forth horizontally with the dust collection frame 116, also heats and dries the PVC plastic sheet 2 that has been soaked in polishing agent before proceeding to the next step.

[0067] It should be noted that the specific models and specifications of the servo motor 71, drive motor 76, heating lamp 117 and stepper motor 18 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0068] The power supply circuits for the servo motor 71, drive motor 76, heating lamp 117, and stepper motor 18 are clear to those skilled in the art. Meanwhile, the substrate layer 26, reinforcing layer 27, plastic layer 28, antistatic layer 29, and flame-retardant layer 30 used for making PVC sheets are all mature materials in this technical field and can be purchased on the market, and will not be described in detail here.

[0069] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A processing and polishing device for antistatic and flame-retardant PVC sheets, comprising a transmission frame (1), characterized in that: The transmission frame (1) carries PVC plastic sheet (2), and a fixed frame (3) is fixedly connected to the center of the bottom of the transmission frame (1). Fixed cylinders (4) are fixedly connected to both sides of the transmission frame (1) near the fixed frame (3), and horizontal grooves are opened on both sides of the fixed cylinders (4). A pressure boosting frame (5) is fixedly connected to one side of the fixed frame (3), and a negative pressure frame (6) is fixedly connected to the other side of the fixed frame (3). The inner cavity of the fixed frame (3) is provided with a fine grinding component that cooperates with the polishing of the PVC plastic sheet (2) on the transmission frame (1). The fine grinding component includes a servo motor (71) fixed at the center of the bottom of the fixed frame (3) and a turntable frame (72) fixed on the output shaft of the servo motor (71). A round protrusion (73) is fixedly connected to one side of the top of the turntable frame (72), and a swing frame (74) is slidably connected to the round protrusion (73). The swing frame (74) is driven by a servo motor (71). A connecting frame (75) is fixedly connected to the outside of the swing frame (74), and a drive motor (76) is fixedly connected to the top array of the connecting frame (75). The output shaft of the drive motor (76) is fixedly connected to a polishing disc (77) that is compatible with the polishing of the PVC plastic sheet (2). The polishing disc (77) adopts a design with small sides and a large middle. The horizontal polishing area of ​​the polishing disc (77) is larger than the width of the polishing area of ​​the PVC plastic sheet (2). The swing frame (74) drives the polishing disc (77) on the drive motor (76) through the connecting frame (75) to achieve a high-efficiency and fine polishing effect on the PVC plastic sheet (2) that passes by. This is to prevent the PVC plastic sheet (2) from being under-polished or over-polished, improve the polishing quality of the PVC plastic sheet (2), and facilitate the subsequent spraying of various coatings. The transmission frame (1) is provided with a first displacement component and a spraying component on the side near the pressure booster frame (5) for use with the fixed cylinder (4) and is used for the polishing spraying of PVC plastic sheet (2) at the loading point of the transmission frame (1). The first displacement component includes a belt groove (81) opened at the outer end of the turntable frame (72) and a synchronous belt driven in the belt groove (81). The spraying component includes a pressure boosting channel (92) connecting the two sides of the pressure booster frame (5). The belt groove (81) on the turntable frame (72) is connected to the first synchronous pulley (82) via a synchronous belt drive. The top of the first synchronous pulley (82) is fixedly connected to the first main bevel gear (83) via a rotating rod. The outer side of the first main bevel gear (83) is meshed with the first secondary bevel gear (84). The inner cavity of the first secondary bevel gear (84) is fixedly connected to the first reciprocating screw (85) which rotates with the fixed cylinder (4). The first reciprocating screw (85) is threadedly connected to the first screw sleeve (86). The first screw sleeve (86) is fixedly connected to both sides of the first rectangular frame (87) which slides with the transverse groove. The first screw sleeve (86) drives the first rectangular frame (87) to move back and forth along the PVC plastic sheet (2) area at the loading point of the transmission frame (1) to facilitate the subsequent spraying of polishing agent on the PVC plastic sheet (2) area at the loading point of the transmission frame (1). The bottom of the first synchronous pulley (82) is fixedly connected to an exhaust fan (91) that works with the booster frame (5) and the booster channel (92) via a rotating rod. The outer side of the booster channel (92) is connected to a first telescopic tube (93). The outer end of the first telescopic tube (93) is connected to a booster tube (94) that is fixedly fitted with the first rectangular frame (87). The inner end of the booster tube (94) is connected to a five-way valve (95). The top of the five-way valve (95) is connected to a liquid reservoir (96). Both ends of the five-way valve (95) are connected to booster angle tubes (97) that are embedded in the first rectangular frame (87). The liquid reservoir (96) The polishing agent inside also reaches the five-way valve (95), and under the action of wind pressure, the polishing agent inside the five-way valve (95) is forced through two pressure-boosting angle tubes (97). The bottom end of the pressure-boosting angle tubes (97) is connected to a spraying rack (16), and the bottom array of the spraying rack (16) is provided with atomizing micro-holes (17) for spraying polishing agent on PVC plastic sheet (2). This is used to uniformly and comprehensively atomize and spray polishing agent on the PVC plastic sheet (2) area at the loading point of the transfer rack (1), thereby improving the polishing quality of PVC plastic sheet (2) and also providing lubrication and protection for PVC plastic sheet (2).

2. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 1, characterized in that: Both sides of the center of the back of the transmission frame (1) are fixedly connected to stepper motors (18), and the output shaft of the stepper motor (18) is fixedly connected to a polishing roller (19) that is pre-polished on the PVC plastic sheet (2). The stepper motor (18) drives the polishing roller (19) to perform auxiliary polishing on the PVC plastic sheet (2) during the transmission process.

3. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 1, characterized in that: One side of the transmission frame (1) is rotatably connected to a tension roller (20) that adjusts the tension of the PVC plastic sheet (2), which plays a role in the orderly tensioning of the PVC plastic sheet (2) at low speed. The other side of the transmission frame (1) is rotatably connected to a dust-adhesive roller (21) that adheres to impurities on the PVC plastic floor 2, which helps to collect and adhere impurities on the polished PVC plastic sheet (2).

4. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 1, characterized in that: The transmission frame (1) is provided with T-shaped slide rails (12) on both the front and rear sides near the fixed frame (3), and the inner cavity of the T-shaped slide rail (12) is slidably connected with a T-shaped slide rail block (13) that is fixedly matched with the connecting frame (75). This block is used to limit the sliding of the connecting frame (75) and also improves the stability of the horizontal reciprocating motion of the connecting frame (75) to prevent the connecting frame (75) and its components from shaking or tilting.

5. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 1, characterized in that: The transmission frame (1) has a first T-shaped groove (14) on both the front and rear sides near the first rectangular frame (87), and the inner cavity of the first T-shaped groove (14) is slidably connected to a first T-shaped slider (15) that is fixedly matched with the first rectangular frame (87), which is used to limit the sliding of the first rectangular frame (87) to prevent the first rectangular frame (87) and its components from shaking or tilting.

6. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 1, characterized in that: The transmission frame (1) is provided with a second displacement component and a negative pressure component on the side near the negative pressure frame (6) for use with the fixed cylinder (4), and is used for dust collection, cleaning and drying of PVC plastic sheet (2) at the material unloading point of the transmission frame (1). The second displacement component includes a second synchronous wheel (101) connected to the other side by a synchronous belt in the belt groove (81). The bottom of the second synchronous wheel (101) is fixedly connected to a vacuum fan (102) for use with the negative pressure frame (6) by a rotating rod. The turntable frame (72) drives the second synchronous wheel (101) to rotate by the synchronous belt in the belt groove (81). The second synchronous wheel (101) drives the vacuum fan (102) to rotate in the negative pressure frame (6) by the rotating rod and generates negative pressure suction.

7. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 6, characterized in that: The top of the second synchronous pulley (101) is fixedly connected to the second main bevel gear (103) via a rotating rod. The outer side of the second main bevel gear (103) is meshed with the second auxiliary bevel gear (104), and the outer side of the second auxiliary bevel gear (104) is fixedly connected to the second reciprocating screw (105) which rotates with the fixed cylinder (4). The second reciprocating screw (105) is threaded with the second screw sleeve (106), and the two sides of the second screw sleeve (106) are fixedly connected to the second rectangular frame (107) which slides with the transverse groove. The second synchronous pulley (101) also drives the second main bevel gear (103) and the second auxiliary bevel gear (104) to rotate successively. The second auxiliary bevel gear (104) drives the second screw sleeve (106) to move back and forth horizontally through the second reciprocating screw (105). The second screw sleeve (106) drives the second rectangular frame (107) to move back and forth horizontally.

8. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 7, characterized in that: The transmission frame 1 has a second T-shaped groove (24) on both the front and rear sides near the second rectangular frame (107), and the inner cavity of the second T-shaped groove (24) is slidably connected to a second T-shaped slider (25) that is fixedly matched with the second rectangular frame (107), which plays a role in sliding and limiting the horizontal back-and-forth displacement of the second rectangular frame (107).

9. The processing and polishing equipment for anti-static and flame-retardant PVC sheets according to claim 8, characterized in that: The negative pressure assembly includes negative pressure channels (111) connected to both sides of the negative pressure frame (6), and a second telescopic tube (112) is connected to the outer side of the negative pressure channel (111). The outer end of the second telescopic tube (112) is connected to a negative pressure tube (113), and the inner end of the negative pressure tube (113) is connected to a four-way valve (114). Both ends of the four-way valve (114) are connected to negative pressure angle tubes (115) that are embedded and cooperate with the second rectangular frame (107). The bottom end of the negative pressure angle tube (115) is connected to a dust collection frame (116) for dust collection and cleaning of PVC plastic sheet (2) at the unloading point of the transfer frame (1). The negative pressure suction generated in the negative pressure frame (6) is generated by the two sets of negative pressure channels (111) and The second telescopic tube (112) passes through the negative pressure angle tubes (115) at both ends of the four-way valve (114) to reach the dust collection rack (116), where it performs negative pressure adsorption and collection of impurities and dust on the polished PVC plastic sheet (2). After returning along the same route, it is discharged through the dust discharge channel (22) to the dust collection tank (23) for temporary storage, so as to facilitate subsequent unified cleaning. Both sides of the dust collection rack (116) are fixedly connected with heating lamps (117) for drying and heating the PVC plastic sheet (2) at the unloading point of the transmission rack (1). At the same time, the heating lamps (117) that move horizontally back and forth with the dust collection rack (116) also heat and dry the PVC plastic sheet (2) after it is soaked in polishing agent, which is beneficial to subsequent work.

10. A processing and polishing equipment for anti-static and flame-retardant PVC sheets according to any one of claims 1-9, characterized in that: The inner cavity of the PVC plastic sheet (2) is provided with a base layer (26), a reinforcing layer (27), a plastic layer (28), an antistatic layer (29) and a flame retardant layer (30). The reinforcing layer (27) is made of cross-woven warp threads (31) and weft threads (32), and the ends of the warp threads (31) and weft threads (32) are sealed with flexible material (33).

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