High-strength PVC composite board and production system thereof

Abstract

The invention relates to the technical field of PVC (polyvinyl chloride) composite boards, in particular to a high-strength PVC composite board and a production system thereof, and the high-strength PVC composite board comprises the following components in parts by weight: 80-100 parts of PVC type V resin; 25 to 40 parts of calcium carbonate; 3 to 4 parts of CPE; 0.5 to 1 part of ACR; 2-4 parts of a heat stabilizer; 2-4 parts of an impact modifier; and 8-10 parts of a lubricant. According to the invention, calcium carbonate, CPE and ACR are added into the PVC type-5 resin, and calcium carbonate can reduce melt viscosity, improve molding fluidity, reduce surface defects during calendaring molding, improve hardness, rigidity and dimensional stability of a molded plate, and improve tensile strength of the molded plate; calcium carbonate and ACR cooperate to improve the low-temperature impact resistance of the formed plate, CPE forms a three-dimensional network structure through an elastomer with the chlorine content of 25-45%, and the low-temperature brittleness problem of the formed plate is solved. Therefore, the applicability of the formed high-strength PVC composite board is improved.

Description

Technical Field

[0001] This invention relates to the field of PVC composite sheet technology, and more specifically to a high-strength PVC composite sheet and its production system. Background Technology

[0002] PVC sheets are waterproof, flame-retardant, acid and alkali resistant, insect-proof, lightweight, heat-insulating, sound-insulating, and shock-absorbing. They are widely used in building decoration, construction formwork, furniture manufacturing, chemical corrosion protection, advertising signage, and vehicle and ship interior decoration.

[0003] According to announcement number CN105086232B, announced on December 19, 2017, a PVC substrate and its preparation method, as well as a PVC composite board, are disclosed. The PVC substrate comprises, by weight, the following raw materials: 60-80 parts PVC, sodium heavy carbonate, 3-10 parts stabilizer, 0.5-2 parts balancing lubricant, 0.5-2 parts foaming agent, and 5-10 parts foaming regulator. The PVC includes SG-5 type PVC and SG-8 type PVC, and the weight ratio of PVC to sodium heavy carbonate is 1:1-1.3. The PVC composite board comprises a PVC substrate and a semi-rigid PVC layer on the surface of the substrate.

[0004] In the prior art, including the aforementioned patents, the characteristics of the molecular chain structure of PVC resin result in its obvious brittleness. Furthermore, PVC sheets have poor toughness and low impact strength at room temperature, and their brittleness is even more pronounced at low temperatures, making PVC sheets unsuitable for use in cold regions. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength PVC composite board and its production system to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-strength PVC composite board, comprising the following components in parts by weight: PVC type 5 resin: 80-100 parts; calcium carbonate: 25-40 parts; CPE: 3-4 parts; ACR: 0.5-1 part; heat stabilizer: 2-4 parts; impact agent: 2-4 parts; lubricant: 8-10 parts.

[0007] A production system for producing the high-strength PVC composite sheet described in the above scheme includes a hot mixer body and a stirring rod rotatably disposed in its inner cavity. A sieve plate for separating the inner cavity of the hot mixer body to form an upper chamber and a lower chamber is fixedly disposed on the stirring rod. The sieve plate is provided with a vortex-shaped screening groove.

[0008] Preferably, the device also includes a fixed seat fixedly disposed in the lower chamber, wherein flexible plates are arranged at intervals along the vortex direction of the screening groove on the fixed seat, and the first end of the flexible plate extends into the upper chamber through the screening groove.

[0009] Preferably, it also includes abutment strips arranged along the chamfer of the upper end of the screening trough, wherein the abutment strips and the screen plate form receiving grooves located on both sides of the screening trough.

[0010] Preferably, a scraper plate is also included, which is flipped and disposed on the sieve plate, and the two rotate synchronously; during the rotation process, the scraper plate moves and passes over the flexible plate, and its end makes sliding contact with the first side and the second side of the flexible plate successively.

[0011] Preferably, the system also includes multiple collection seats mounted on the sieve plate and arranged in an array along the curve of the sieve groove. Each collection seat has a collection cavity, and a filter plate is fixedly installed inside the collection cavity. The collection cavity is connected to the receiving groove.

[0012] Preferably, the first side of the sieve plate has a plurality of contact grooves and a connecting hole arranged in an array along the curve of the sieve groove. The connecting hole connects the collection chamber with the contact grooves, and the flexible plate enters the contact grooves to move in a piston-like motion during the sliding contact with the second side.

[0013] Preferably, the flexible plate also includes an abutment block that is slidably arranged on the scraper plate. The first end of the flexible plate is provided with an overlap hook. When the flexible plate slides into contact with the first side, the overlap hook and the abutment block are attached to each other and move synchronously. The two are unattached before the flexible plate slides into contact with the second side.

[0014] Preferably, the assembly also includes a connecting rope, an elastic element, and a movable seat. The first end of the connecting rope is fixedly connected to the scraper plate via the elastic element, and the second end of the connecting rope passes through a limiting part provided on the movable seat to connect to the screen plate.

[0015] Preferably, the second end of the connecting rope is provided with a connecting buckle that engages with a buckle groove opened on the collecting seat.

[0016] In the above technical solution, the high-strength PVC composite sheet and its production system provided by the present invention have the following beneficial effects: By adding calcium carbonate, CPE, and ACR to PVC type 5 resin, calcium carbonate can reduce melt viscosity, improve molding fluidity, reduce surface defects during calendering, and thus improve the hardness, rigidity, and dimensional stability of the formed sheet. It can also increase the tensile strength of the formed sheet. The synergistic effect of calcium carbonate and ACR can also improve the low-temperature impact resistance of the formed sheet. Meanwhile, CPE, through the formation of a three-dimensional network structure using an elastomer with a chlorine content of 25-45%, improves the low-temperature brittleness problem of the formed sheet. Therefore, the applicability of the formed high-strength PVC composite sheet is improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the production system process provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the heat mixer body provided in an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional schematic diagram of the internal structure of the heat mixer provided in an embodiment of the present invention;

[0021] Figure 4 An exploded structural diagram of the sieve plate and stirring rod provided in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the sieve plate, the fixed base, and the flexible plate provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the sieve plate and the scraper plate provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the fixing base and the flexible plate provided in an embodiment of the present invention;

[0025] Figure 8 A cross-sectional view of the sieve plate, fixing base, flexible plate and scraping plate provided in an embodiment of the present invention;

[0026] Figure 9 An exploded structural diagram of the scraping plate, connecting rope, elastic element, movable seat, transmission gear and abutment block provided in the embodiments of the present invention;

[0027] Figure 10 Provided for embodiments of the present invention Figure 8 A magnified view of a portion of point A in the middle.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Heat mixer body; 11. Upper chamber; 12. Lower chamber; 13. Feed inlet; 2. Stirring rod; 21. Upper stirring blade; 22. Lower stirring blade; 23. Magnetic disc; 3. Sieve plate; 31. Sieving trough; 32. Receiving trough; 33. Suction hole; 34. Contact groove; 341. Connecting hole; 35. Fixing hole; 4. Fixing base; 5. Flexible plate; 51. Overlapping hook; 6. Contact strip; 71. Scraping plate; 711. Mounting groove; 712. Sliding groove; 7 13. Rotating part; 72. Connecting rope; 721. Connecting buckle; 73. Elastic element; 74. Movable seat; 741. Limiting part; 742. Through hole; 743. First linear tooth groove; 75. Transmission gear; 76. Abutting block; 761. Overlap groove; 762. Sliding part; 763. Second linear tooth groove; 91. Drive motor; 92. Collection seat; 921. Collection chamber; 922. Inlet hole; 923. Fastening groove; 93. Filter plate; 94. Protective plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0031] Example 1

[0032] like Figure 1 As shown, a high-strength PVC composite board is composed of the following components in parts by weight: PVC type 5 resin: 80-100 parts; calcium carbonate: 25-40 parts; CPE: 3-4 parts; ACR: 0.5-1 parts; heat stabilizer: 2-4 parts; impact agent: 2-4 parts; lubricant: 8-10 parts.

[0033] Specifically, the high-strength PVC composite board is composed of the following components in parts by weight: PVC Type V resin: 80 parts; calcium carbonate: 25 parts; CPE: 3 parts; ACR: 0.5 parts; heat stabilizer: 2 parts; impact reducer: 2 parts; lubricant: 8 parts.

[0034] During the production process, calcium carbonate, CPE, and ACR are added to PVC type 5 resin. Calcium carbonate reduces melt viscosity, improves molding fluidity, reduces surface defects during calendering, and enhances the hardness, rigidity, and dimensional stability of the molded sheet. It also increases the tensile strength of the molded sheet. The synergistic effect of calcium carbonate and ACR also improves the low-temperature impact resistance of the molded sheet. CPE, through its 25-45% chlorine content elastomer forming a three-dimensional network structure, mitigates the low-temperature brittleness of the molded sheet. This, in turn, improves the applicability of the resulting high-strength PVC composite sheet.

[0035] In the above technical solution, calcium carbonate, CPE, and ACR are added to PVC type 5 resin. Calcium carbonate can reduce melt viscosity, improve molding fluidity, reduce surface defects during calendering, and enhance the hardness, rigidity, and dimensional stability of the molded sheet. It can also improve the tensile strength of the molded sheet. Calcium carbonate and ACR synergistically improve the low-temperature impact resistance of the molded sheet, while CPE, through the formation of a three-dimensional network structure with a chlorine content of 25-45%, improves the low-temperature brittleness of the molded sheet. This enhances the applicability of the resulting high-strength PVC composite sheet.

[0036] Example 2

[0037] like Figure 2-10 As shown, a production system is used to produce high-strength PVC composite boards as described in Embodiment 1 above. The production system includes a hot mixer body 1 and a stirring rod 2 rotatably disposed in its inner cavity. A sieve plate 3 is fixedly disposed on the stirring rod 2 to separate the inner cavity of the hot mixer body 1 to form an upper chamber 11 and a lower chamber 12. A sieve plate 3 is provided on the sieve plate 3 in the form of a vortex.

[0038] Specifically, such as Figure 1 As shown, the production system also includes a cold mixer, a twin-screw extruder, a die, a dry and wet setting die, a traction machine, a cutting saw, and a packaging machine. In the actual production process, the PVC resin and other components measured in the formula are first added to the hot mixer, where they are stirred at high speed and heated to 120°C for mixing. After being mixed evenly, the mixture is placed in the cold mixer and cooled to 45°C while being mixed, forming a loose, free-flowing powdery mixture, which is then discharged for later use. A counter-rotating twin-screw extruder with an exhaust device is selected. The extruder is preheated. After feeding, the material is uniformly plasticized into a melt through processes such as conveying, venting, and melting. Upon reaching the die head, it is further homogenized and compacted into a dense preform by the pressure of the die head. The preform flows continuously through the die in a preliminary forming state. The preform from the die is initially pulled into the dry and wet shaping mold, and vacuum adsorption is used to make the preform adhere tightly to the inner wall of the shaping mold. The profile from the shaping mold is synchronously pulled by the traction machine for continuous production. At the cutting saw, it is cut to the required length according to the product, and then packaged and stored.

[0039] And such Figure 2 As shown, the hot mixer body 1 has a feed inlet 13. A drive motor 91 is installed at the bottom of the hot mixer body 1. The stirring rod 2 is equipped with an upper stirring blade 21, a lower stirring blade 22 and a magnetic disk 23. An electromagnet is installed at the output end of the drive motor 91 to drive the stirring rod 2 to rotate through the magnetic disk 23, forming a magnetic stirring structure. The upper stirring blade 21 is located in the upper chamber 11 and the lower stirring blade 22 is located in the lower chamber 12. A protective plate 94 is installed on the inner wall of the lower chamber 12.

[0040] The sieve plate 3 is provided with fixing holes 35. The sieve plate 3 is coaxially welded to the stirring rod 2 through the fixing holes 35, so that the sieve plate 3 separates the upper chamber 11 and the lower chamber 12. When the resin raw material particles are put into the upper chamber 11 from the feed inlet 13, the small particles fall from the screening groove 31 of the sieve plate 3 into the lower chamber 12, while the large particles are blocked by the screening groove 31 and remain in the upper chamber 11. This achieves the separation of large and small particles of resin raw material for heating, mixing and stirring, avoiding the problem of excessive heat decomposition of small particles in the resin raw material. When the stirring rod 2 rotates, the upper stirring blade 21 and the lower stirring blade 22 are respectively located in the upper chamber 11 and the lower chamber 12 to rotate and stir the resin particles. Figure 5 As shown, the screening tank 31 is vortex-shaped, and the screen plate 3 rotates counterclockwise synchronously with the stirring rod 2. This causes large particles of raw material at the bottom of the upper chamber 11 to come into contact with the screening tank 31. As the screen plate 3 rotates counterclockwise, the large particles roll out along the screening tank 31 towards the outer ring of the screen plate 3 and contact the side wall of the upper chamber 11. This allows the raw material particles in the middle of the upper chamber 11 to move towards the inner wall of the upper chamber 11, avoiding insufficient heating of the large particles in the center of the upper chamber 11. Furthermore, the vortex-shaped rather than annular design of the screening tank 31 alleviates the problem of particle breakage caused by the continuous rolling of large particles against the screen tank 31, reducing fine powder generated from particle breakage and improving the mixing uniformity of PVC resin raw material particles with heat stabilizers and lubricants.

[0041] In the above technical solution, the sieve plate 3 has a vortex-shaped screening groove 31. The sieve plate 3 rotates counterclockwise so that large particles of raw material roll out along the screening groove 31 towards the outer ring of the sieve plate 3 and come into contact with the side wall of the upper chamber 11. This allows the raw material particles in the middle of the upper chamber 11 to move to the inner wall of the upper chamber 11, avoiding the problem of insufficient heating of large particles of raw material in the center of the upper chamber 11. Secondly, the screening groove 31 is vortex-shaped rather than annular, which can alleviate the problem of particle breakage caused by large particles of raw material resisting the continuous rolling within the screening groove 31, reduce the fine powder generated by particle breakage, and improve the mixing uniformity of PVC resin raw material particles with heat stabilizer and lubricant.

[0042] As another embodiment of the present invention, it also includes a fixed seat 4 fixedly disposed in the lower chamber 12. Flexible plates 5 are arranged at intervals on the fixed seat 4 along the vortex direction of the screening groove 31. The first end of the flexible plate 5 extends into the upper chamber 11 through the screening groove 31.

[0043] Specifically, such as Figure 3 As shown, the fixed base 4 is welded into the lower chamber 12, and a flexible plate 5 is fixedly connected to the fixed base 4 with glue. Several flexible plates 5 are arranged at intervals along the vortex direction of the screening groove 31, and the upper end of the flexible plate 5 is the first end. The upper end of the flexible plate 5 extends into the upper chamber 11 through the screening groove 31 at an incline. When the sieve plate 3 rotates synchronously with the stirring rod 2, the sieve plate 3 rotates relative to the flexible plate 5, such as... Figure 5 As shown, as the sieve plate 3 rotates counterclockwise, the flexible plate 5 first moves within the screening trough 31 to push away the large resin particles stuck in the screening trough 31. Then, as the sieve plate 3 continues to rotate, the flexible plate 5 is deformed by the pressure of the side wall of the sieve plate 3. The flexible plate 5 comes out of the screening trough 31 and abuts against the bottom of the sieve plate 3. After the sieve plate 3 rotates one revolution, the flexible plate 5 is re-deformed by its own elasticity and extends into the screening trough 31, and pushes away the large resin particles stuck in the screening trough 31 again.

[0044] Furthermore, the presence of the flexible plate 5 is used to push and release large resin particles stuck on the screening tank 31, preventing them from being continuously impacted and broken as the screen plate 3 rotates. This further alleviates the breakage problem of the raw material during the mixing process. It improves the protection of the raw material particles, reduces the fine powder generated due to particle breakage, and further improves the mixing uniformity of PVC resin raw material particles with heat stabilizer and lubricant. Secondly, when the flexible plate 5 re-deforms due to its own elasticity and extends into the screening tank 31, it will also push the raw material particles at the bottom of the upper chamber 11 upwards, thereby improving the mixing uniformity of the upper and lower sides of the upper chamber 11.

[0045] As another embodiment of the present invention, it also includes an abutment strip 6 arranged along the chamfer of the upper end of the screening trough 31, and the abutment strip 6 and the sieve plate 3 form a receiving groove 32 located on both sides of the screening trough 31.

[0046] Specifically, such as Figure 4 As shown, chamfers are provided on the upper side of the screening trough 31, and abutment strips 6 are adhered to the chamfers of the screening trough 31, such as... Figure 8As shown, at this time, the screen plate 3 and the contact strip 6 are connected by the chamfer of the screening groove 31 to form a receiving groove 32, and the receiving groove 32 is located on both sides of the screening groove 31. When the screen plate 3 is driven to rotate, the small particles of raw material in the upper chamber 11 fall into the lower chamber 12 through the screening groove 31, while the large particles of raw material will abut against the contact strip 6 and be located on the upper side of the screening groove 31. As the screen plate 3 rotates, the large particles of raw material will roll along the screening groove 31 and against the contact strip 6 toward the outer ring side of the screen plate 3. The presence of the contact strip 6 further supports the large particles of raw material, alleviating the situation where the large particles of raw material roll into contact with the hard side wall of the screening groove 31 and break, thereby further improving the protection of the raw material particles. Secondly, during the mixing process, the collision and mixing of raw material particles inevitably produces fine powder. As large raw material particles roll along the screening trough 31 and against the contact strip 6 towards the outer ring of the screen plate 3, the fine powder adhering to the large raw material particles easily falls into the collecting trough 32 and is collected, thereby reducing the continuous accumulation of fine powder on the high-temperature zone of the inner wall of the upper chamber 11 and improving the protection of the hot mixer body 1. This further reduces the impact of fine powder on the uniformity of mixing of raw material particles with heat stabilizers and lubricants.

[0047] Secondly, during the mixing process, the sieve plate 3 rotates circumferentially relative to the flexible plate 5. When the sieve plate 3 rotates counterclockwise, the flexible plate 5 first moves within the screening tank 31 to push away the large resin particles stuck in the screening tank 31. Then, as the sieve plate 3 continues to rotate, the flexible plate 5 is deformed by the pressure of the side wall of the sieve plate 3. The flexible plate 5 comes out of the screening tank 31 and abuts against the bottom of the sieve plate 3. At this time, the flexible plate 5 will also press the contact strip 6 so that the contact strip 6 deforms and moves closer to the receiving tank 32. This allows the contact strip 6 to press the fine powder contained in the receiving tank 32 to compress and bind the fine powder, thereby further preventing the fine powder in the receiving tank 32 from floating out and re-entering the upper chamber 11, and further reducing the impact of the fine powder on the mixing uniformity of the raw material particles, heat stabilizer and lubricant.

[0048] As another embodiment of the present invention, it also includes a scraping plate 71 that is flipped and disposed on the sieve plate 3, and the two rotate synchronously; during the above rotation process, the scraping plate 71 moves and passes over the flexible plate 5, and its end successively slides into contact with the first side and the second side of the flexible plate 5.

[0049] Specifically, such as Figure 9 As shown, a rotating part 713 is provided on the scraping plate 71. The rotating part 713 is rotatably mounted on the screen plate 3. When the scraping plate 71 rotates synchronously with the screen plate 3, the scraping plate 71 initially remains perpendicular to the screen plate 3. The screen plate 3 rotates so that the flexible plate 5 first moves within the screening groove 31. Subsequently, the flexible plate 5 is deformed by the pressure of the side wall of the screen plate 3, and the flexible plate 5 detaches from the screening groove 31 and abuts against the bottom of the screen plate 3. Figure 5As shown, the inclined surface of the flexible plate 5 facing the outermost end of the screening trough 31 is the first side surface, while the inclined surface of the flexible plate 5 facing away from the outermost end of the screening trough 31 is the second side surface. Figure 8 As shown, the sieve plate 3 continues to drive the scraper plate 71 to rotate and move, so that the end of the scraper plate 71 first contacts the first side of the flexible plate 5. The end of the scraper plate 71 squeezes the flexible plate 5 to deform and moves to scrape the first side of the flexible plate 5. Then, after the scraper plate 71 passes the flexible plate 5, the flexible plate 5 is elastically reset and its end again touches the bottom of the sieve plate 3. At this time, the scraper plate 71 rotates and moves closer to the sieve plate 3 with the rotating part 713 as the rotation axis, so that the scraper plate 71 touches the second side of the flexible plate 5 to press the flexible plate 5 to the bottom of the sieve plate 3. As the scraper plate 71 continues to follow the sieve plate 3 to rotate circumferentially, the flexible plate 5 gradually moves away from the scraper plate 71, so that the scraper plate 71 moves to scrape the second side of the flexible plate 5.

[0050] Furthermore, the scraping plate 71 is used to scrape the two sides of the flexible plate 5, thereby scraping off the small particles of raw material adhering to the flexible plate 5 and avoiding the problem of insufficient heating due to some small particles of raw material adhering to the flexible plate 5.

[0051] A servo electric cylinder and a trigger sensor can be installed inside the scraper plate 71 so that when the scraper plate 71 moves and crosses the flexible plate 5, the servo electric cylinder and the trigger sensor can drive the scraper plate 71 to flip and move closer to the screen plate 3.

[0052] As another embodiment of the present invention, it also includes a plurality of collection seats 92 installed on the sieve plate 3 and distributed in a curved array along the sieve groove 31. The collection seat 92 has a collection cavity 921, and a filter plate 93 is fixedly installed in the collection cavity 921. The collection cavity 921 is connected to the receiving groove 32.

[0053] Specifically, such as Figure 4 As shown, several collection seats 92 are provided on the sieve plate 3, and a filter plate 93 is provided in the collection cavity 921 of the collection seat 92. The collection seat 92 is provided with an inlet hole 922 that communicates with the collection cavity 921. The sieve plate 3 is also provided with a suction hole 33 that communicates with the receiving groove 32. The inlet hole 922 and the suction hole 33 are coaxially connected. The fine powder in the receiving groove 32 can be drawn and collected into the collection seat 92 through the filter plate 93, the inlet hole 922 and the suction hole 33, thereby collecting and storing the fine powder in the upper chamber 11, and further reducing the impact of fine powder on the mixing uniformity of raw material particles, heat stabilizer and lubricant.

[0054] A negative pressure component can be arranged in the collection seat 92 to draw the fine powder in the receiving tank 32 through the filter plate 93, the inlet hole 922 and the suction hole 33 into the collection seat 92 for collection.

[0055] As another embodiment of the present invention, the first side of the sieve plate 3 is provided with a plurality of contact grooves 34 and a connecting hole 341 arranged in a curved array along the sieve groove 31. The connecting hole 341 connects the collection cavity 921 with the contact grooves 34, and the flexible plate 5 enters the contact grooves 34 to move in a piston-like manner during the sliding contact with the second side.

[0056] Specifically, such as Figure 8 As shown, the bottom surface of the sieve plate 3 is the first side surface, on which a plurality of contact grooves 34 and connecting holes 341 are provided. The two ends of the connecting holes 341 are respectively connected to the contact grooves 34 and the collection chamber 921, and the filter plate 93 separates the connecting holes 341 and the extraction holes 922.

[0057] When the sieve plate 3 drives the scraper plate 71 to rotate and move, the end of the scraper plate 71 first contacts the first side of the flexible plate 5. The end of the scraper plate 71 squeezes the flexible plate 5 to deform and move to scrape the first side of the flexible plate 5. Then, after the scraper plate 71 passes the flexible plate 5, the flexible plate 5 is elastically reset and its end again abuts against the abutting groove 34 at the bottom of the sieve plate 3. At this time, the scraper plate 71 rotates relative to the sieve plate 3 about the rotating part 713 as the rotation axis, and then the scraper plate 71 abuts against the second side of the flexible plate 5 to press the flexible plate 5 into the abutting groove 34 of the sieve plate 3. The scraping plate 71 abuts against the bottom surface of the sieve plate 3 to contact the second side of the flexible plate 5. That is, the scraping plate 71 and the abutting groove 34 enclose a piston cavity. As the scraping plate 71 continues to rotate circumferentially with the sieve plate 3, the flexible plate 5 gradually moves away from the scraping plate 71, so that the flexible plate 5 slides away from the piston cavity formed by the abutting groove 34 and the scraping plate 71. At this time, the negative pressure generated in the abutting groove 34 can draw the fine powder collected in the receiving groove 32 into the collecting seat 92 through the connecting hole 341, the filter plate 93, the extraction hole 922 and the suction hole 33.

[0058] Furthermore, by utilizing the scraping plate 71, the flexible plate 5, and the contact groove 34, a negative pressure is formed inside the collection seat 92 during the rotation of the sieve plate 3, and the fine powder in the receiving groove 32 is automatically sucked up without the need for additional negative pressure suction components, thus simplifying the device structure and improving the service life of the device.

[0059] As another embodiment of the present invention, it also includes an abutment block 76 slidably arranged on the scraping plate 71. An overlap hook 51 is provided on the first end of the flexible plate 5. When the flexible plate 5 slides in contact with the first side, the overlap hook 51 and the abutment block 76 are hooked together to move synchronously. The two are unhooked before the flexible plate 5 slides in contact with the second side.

[0060] Specifically, such as Figure 7 As shown, the upper end of the flexible plate 5 is the first end, and symmetrical grooves are formed on it to create overlapping hooks 51. Figure 9As shown, the sliding part 762 provided on the abutment block 76 is slidably disposed in the sliding groove 712 opened on the scraper plate 71, and the abutment block 76 is provided with overlapping grooves 761 on opposite sides.

[0061] When the sieve plate 3 drives the scraper plate 71 to rotate and move, the end of the scraper plate 71 first contacts the first side of the flexible plate 5. The end of the scraper plate 71 squeezes the flexible plate 5 to deform and move to scrape the first side of the flexible plate 5. Then, after the scraper plate 71 passes the flexible plate 5, the flexible plate 5 is elastically reset, causing the overlapping hook 51 of the flexible plate 5 to hook onto the overlapping groove 761 of the abutment block 76. As the flexible plate 5 continues to deform and reset due to its own elasticity, the overlapping hook 51 will pull... The moving contact block 76 slides along the sliding groove 712 and approaches the rotating part 713. Then the flexible plate 5 continues to deform and reset, approaching the bottom of the screen plate 3 so that the overlapping hook 51 is disengaged from the overlapping groove 761. The flexible plate 5 deforms to abut against the contact groove 34. At this time, the scraping plate 71 rotates relative to the screen plate 3 with the rotating part 713 as the rotation axis, so that the scraping plate 71 abuts against the second side of the flexible plate 5 to press the flexible plate 5 into the contact groove 34 of the screen plate 3.

[0062] The contact block 76 abuts against the second side of the flexible plate 5 to press the flexible plate 5 into the contact groove 34, thereby further improving the sealing of the piston movement of the flexible plate 5 in the piston cavity formed by the scraping plate 71 and the contact groove 34, and thus improving the collection stability of the collection seat 92 for the fine powder in the receiving groove 32.

[0063] The overlapping hook 51 at the end of the flexible plate 5 can further pull the stuck raw material particles on the screening tank 31 to get them out of the jam, thereby further improving the protection of the raw material particles.

[0064] The contact block 76 can also be used as a trigger block to replace the trigger sensor. A servo electric cylinder is installed in the scraping plate 71. When the contact block 76 is fixed and pulled by the flexible plate 5 to approach the sliding groove 712 and the rotating part 713, the servo electric cylinder drives the scraping plate 71 to flip and approach the screen plate 3.

[0065] As another embodiment of the present invention, it also includes a connecting rope 72, an elastic element 73 and a movable seat 74. The first end of the connecting rope 72 is fixedly connected to the scraping plate 71 through the elastic element 73, and the second end of the connecting rope 72 passes through the limiting part 741 provided on the movable seat 74 to connect to the screen plate 3.

[0066] Specifically, such as Figure 10As shown, the lower end of the connecting rope 72 is the first end, and the upper end is the second end. The lower end of the connecting rope 72 is fixedly connected to the mounting groove 711 opened in the scraping plate 71 by the elastic member 73. The movable seat 74 is slidably disposed in the mounting groove 711 relative to the scraping plate 71. A transmission gear 75 is rotatably disposed in the scraping plate 71. A second straight tooth groove 763 is provided on the contact block 76, and a first straight tooth groove 743 is provided on the movable seat 74. The transmission gear 75 meshes with the first straight tooth groove 743 and the second straight tooth groove 763 respectively.

[0067] The limiting part 741 of the movable seat 74 can radially limit the middle part of the connecting rope 72, and the position where the limiting part 741 radially limits the connecting rope 72 is called the inflection point of the connecting rope 72. When the limiting part 741 of the movable seat 74 aligns the inflection point of the connecting rope 72 with the axis of the rotating part 713, the elastic member 73 pulls the connecting rope 72 to contract along the direction of the rope. Since the inflection point of the connecting rope 72 is located at the axis of the rotating part 713, the tension of the connecting rope 72 and the elastic member 73 can keep the scraping plate 71 in a position perpendicular to the screen plate 3.

[0068] When the flexible plate 5 is reset by its own elastic deformation, the overlapping hook 51 will pull the abutment block 76 to slide along the sliding groove 712 and approach the rotating part 713. The abutment block 76 slides to drive the movable seat 74 to slide away from the rotating part 713 through the transmission gear 75. At this time, the limiting part 741 of the movable seat 74 will move the inflection point of the connecting rope 72 towards the side of the elastic member 73. The tension of the connecting rope 72 and the elastic member 73 can make the scraping plate 71 rotate towards the screen plate 3 and maintain a position parallel to the screen plate 3.

[0069] When the flexible plate 5 slides away from the piston cavity formed by the contact groove 34 and the scraping plate 71, the hook 51 of the flexible plate 5 will pull the contact block 76 back to slide away from the rotating part 713. This causes the contact block 76 to drive the movable seat 74 to slide back closer to the rotating part 713 through the transmission gear 75, and causes the limiting part 741 to align the inflection point of the connecting rope 72 with the axis of the rotating part 713. This allows the connecting rope 72 and the elastic member 73 to reset the scraping plate 71.

[0070] Furthermore, the connecting rope 72, elastic element 73, movable seat 74, abutment block 76, and transmission gear 75 are used to complete the position switching and fixing of the scraper plate 71. There is no need to add an additional drive component inside the scraper plate 71, which further simplifies the device structure and improves the position switching motion stability of the scraper plate 71.

[0071] Among them, the elastic element 73 can be replaced by an elastic object known to those skilled in the art, such as a spring, an elastic plate, or an airbag.

[0072] Furthermore, a through hole 742 is provided on the movable seat 74. When the movable seat 74 slides away from the rotating part 713, the through hole 742 moves to wrap around the elastic member 73, thereby improving the stability of the radial tension of the elastic member 73.

[0073] As another embodiment of the present invention, the second end of the connecting rope 72 is provided with a connecting buckle 721 that is fastened into the fastening groove 923 opened on the collecting seat 92.

[0074] Specifically, such as Figure 9 As shown, a connecting buckle 721 is provided on the connecting rope 72, and a fastening groove 923 is provided on the collecting seat 92. During actual production, the connecting buckle 721 of the connecting rope 72 is fastened into the fastening groove 923 of the collecting seat 92, so that the connecting rope 72 can tighten and fix the collecting seat 92 to the screen plate 3. This eliminates the need for additional fixing components for the collecting seat 92 and facilitates the disassembly and cleaning of the collecting seat 92. Secondly, when the movable seat 74 slides to cause the connecting rope 72 and the elastic element 73 to pull the scraping plate 71 to flip, the tension change of the elastic element 73 on the connecting rope 72 can pull the collecting seat 92 to shake, thereby shaking off the fine powder adhering to the filter plate 93 in the collecting chamber 921, thus improving the collection efficiency of the collecting seat 92 in collecting fine powder in the collecting groove 32. This avoids the problem of poor collection effect of the collecting seat 92 caused by the filter plate 93 being blocked by fine powder.

[0075] Working principle:

[0076] After the raw material is fed into the upper chamber 11 through the feed inlet 13, small particles of raw material fall from the screening groove 31 of the screen plate 3 into the lower chamber 12, while large particles of raw material are blocked by the screening groove 31 and remain in the upper chamber 11.

[0077] The drive motor 91 drives the stirring rod 2 to rotate, so that the upper stirring blade 21 and the lower stirring blade 22 are located in the upper chamber 11 and lower chamber 12 respectively, rotating and stirring the resin particles. The sieve plate 3 rotates counterclockwise synchronously with the stirring rod 2. Large particles of raw material will roll along the screening groove 31 and against the contact strip 6 towards the outer ring side of the sieve plate 3 and contact the side wall of the upper chamber 11. This allows the raw material particles in the middle of the upper chamber 11 to move to the inner wall of the upper chamber 11, while the fine powder adhering to the large particles of raw material easily falls into the collecting trough 32 and is collected.

[0078] The flexible plate 5 first moves within the screening tank 31 to push and release the large resin particles stuck in the screening tank 31. Then, as the screen plate 3 continues to rotate, the flexible plate 5 is deformed by the pressure of the side wall of the screen plate 3, and the flexible plate 5 comes out of the screening tank 31 and abuts against the bottom of the screen plate 3.

[0079] Subsequently, the end of the scraping plate 71 first contacts the first side of the flexible plate 5, causing the end of the scraping plate 71 to press and deform the flexible plate 5 and move to scrape the first side of the flexible plate 5. Then, after the scraping plate 71 passes the flexible plate 5, the flexible plate 5 is elastically reset, causing the hook 51 of the flexible plate 5 to hook onto the overlap groove 761 of the abutment block 76. The hook 51 will pull the abutment block 76 to slide along the sliding groove 712 and approach the rotating part 713. Then, the flexible plate 5 continues to deform and reset, approaching the bottom of the screen plate 3 so that the hook 51 is disengaged from the overlap groove 761 and the flexible plate 5 deforms to abut against the abutment groove 34. At this time, the scraping plate 71 rotates and moves closer to the screen plate 3, and the scraping plate 71 abuts against the second side of the flexible plate 5 to press the flexible plate 5 into the abutment groove 34 of the screen plate 3.

[0080] Subsequently, the flexible plate 5 moves away from the piston cavity formed by the contact groove 34 and the scraping plate 71. At this time, the negative pressure generated in the contact groove 34 can draw the fine powder collected in the receiving groove 32 into the collecting seat 92 through the connecting hole 341, the filter plate 93, the extraction hole 922 and the suction hole 33. During this process, the overlapping hook 51 of the flexible plate 5 will pull the contact block 76 to slide away from the rotating part 713, so that the scraping plate 71 is reset.

[0081] As the sieve plate 3 rotates once, the flexible plate 5 is re-deformed by its own elasticity and extends into the sieve trough 31.

[0082] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-strength PVC composite board, characterized in that, It comprises the following components in parts by weight: PVC Type V resin: 80-100 parts; calcium carbonate: 25-40 parts; CPE: 3-4 parts; ACR: 0.5-1 part; Heat stabilizer: 2-4 parts; Impact retardant: 2-4 parts; Lubricant: 8-10 parts.

2. A production system for producing the high-strength PVC composite sheet as described in claim 1, characterized in that, It includes a hot mixer body (1) and a stirring rod (2) rotatably disposed in its inner cavity. A sieve plate (3) is fixedly disposed on the stirring rod (2) to separate the inner cavity of the hot mixer body (1) to form an upper chamber (11) and a lower chamber (12). A sieve groove (31) in the shape of a vortex is opened on the sieve plate (3).

3. A production system according to claim 2, characterized in that, It also includes a fixed seat (4) fixedly installed in the lower chamber (12), on which flexible plates (5) are arranged at intervals along the vortex direction of the screening groove (31), and the first end of the flexible plate (5) extends into the upper chamber (11) through the screening groove (31).

4. A production system according to claim 3, characterized in that, It also includes a contact strip (6) arranged along the chamfer of the upper end of the screening trough (31), and the contact strip (6) and the sieve plate (3) form a receiving groove (32) on both sides of the screening trough (31).

5. A production system according to claim 4, characterized in that, It also includes a scraper plate (71) that is flipped and set on the sieve plate (3), and the two rotate synchronously; during the above rotation process, the scraper plate (71) moves and passes over the flexible plate (5), and its end successively slides into contact with the first side and the second side of the flexible plate (5).

6. A production system according to claim 5, characterized in that, It also includes multiple collection seats (92) installed on the sieve plate (3) and distributed in a curved array along the sieve groove (31). The collection seat (92) has a collection cavity (921) and a filter plate (93) is fixedly installed in the collection cavity (921). The collection cavity (921) is connected to the receiving groove (32).

7. A production system according to claim 6, characterized in that, The first side of the sieve plate (3) is provided with a plurality of contact grooves (34) and a connecting hole (341) arranged in a curved array along the sieve groove (31). The connecting hole (341) connects the collection chamber (921) with the contact groove (34), and the flexible plate (5) enters the contact groove (34) to move in a piston-like manner during the sliding contact with the second side.

8. A production system according to claim 5, characterized in that, It also includes a contact block (76) that is slidably arranged on the scraping plate (71). The first end of the flexible plate (5) is provided with an overlap hook (51). When the flexible plate (5) slides in contact with the first side, the overlap hook (51) and the contact block (76) are attached to move synchronously until the flexible plate (5) slides in contact with the second side.

9. A production system according to claim 8, characterized in that, It also includes a connecting rope (72), an elastic element (73) and a movable seat (74). The first end of the connecting rope (72) is fixedly connected to the scraping plate (71) through the elastic element (73), and the second end of the connecting rope (72) passes through the limiting part (741) provided on the movable seat (74) to connect to the screen plate (3).

10. A production system according to claim 9, characterized in that, The second end of the connecting rope (72) is provided with a connecting buckle (721) that is fastened into the buckle groove (923) opened on the collecting seat (92).

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