A PVC foam board extrusion die

Abstract

The present invention relates to the field of foam board production technology, specifically a PVC foam board extrusion mold, including a mold frame, a frame bracket for supporting the mold frame, and a mold system installed in the frame bracket, the top of the mold system passes through the working platform and is equipped with an upper mold and a lower mold; the main body of the mold system is a bottom base frame, the top of the bottom base frame is provided with a lower support frame, the top support of the lower support frame is equipped with a lower mold mounting base plate, the mold system also includes a lifting rod group, the top of the lifting rod group extends to the top of the lower mold mounting base plate and is equipped with an upper mold mounting base plate, and the side edge of the mold system is provided with a limiting component, the limiting component is used to limit the lifting rod group to lift in the vertical diameter direction. The present invention ensures the dimensional accuracy and surface quality of the PVC foam board with the precise positioning and stability of the mold system, while ensuring production efficiency, it meets the market demand for high-quality PVC foam boards.

Description

Technical Field

[0001] The invention relates to the technical field of foam board production, in particular to a PVC foam board extrusion die. Background Art

[0002] In the plastic processing industry, PVC foam board is widely used due to its excellent properties such as light weight, heat insulation, sound insulation, corrosion resistance, etc. A Chinese patent (authorization announcement number: CN117283833B) discloses an extrusion die for PVC foam board, the extrusion structure of which includes a stopper, a first mounting plate, a first clamping plate, a second clamping plate, a first connecting rod, a second connecting rod, a linkage rod and a sliding plate, the first clamping plate and the second clamping plate are arranged at intervals, the interval between the first clamping plate and the second clamping plate is a clamping area for clamping the extruded material, a first spring is also provided at one end of the clamping area, and the two ends of the first spring are respectively connected to the first clamping plate and the second clamping plate.

[0003] However, this extrusion structure has certain defects. The patent adopts a scissor-type extrusion structure, which will have an inclination deviation in the force direction, resulting in a deviation in the closing accuracy between the upper and lower molds. Under long-term operation, this deviation will become larger and larger, so it will be more likely to cause defective products in actual production, affecting the finished product yield of the production line. Summary of the invention

[0004] The object of the present invention is to provide a PVC foam board extrusion die to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A PVC foam board extrusion die comprises a die frame, a frame bracket for supporting the die frame, and a die system installed in the frame bracket, wherein a working platform is arranged on the top of the die frame, and an upper die and a lower die are installed on the top of the die system; the main body of the die system is a bottom base frame, a lower support frame is arranged on the top of the bottom base frame, a lower die installation base plate is installed on the top support of the lower support frame, and the lower die is fixedly installed on the lower die installation base plate; the die system further comprises a lifting rod group, the top of the lifting rod group extends to the top of the lower die installation base plate and is installed An upper mold mounting base plate is provided, and the upper mold is fixedly mounted on the upper mold mounting base plate; a limit assembly is provided on the side edge of the mold system, and the limit assembly is used to limit the lifting and lowering of the lifting rod group in the vertical diameter direction; an extrusion driving assembly for driving the lifting rod group to move is provided on the bottom base frame, and a pressure reset assembly is also provided at the bottom end of the bottom base frame, and the bottom of the lifting rod group is supported between the pressure reset assembly and the driving end of the extrusion driving assembly, and a top support buffer assembly is provided on the top of the lifting rod group; an ejection mechanism is also provided on the lower support frame, and the ejection end of the ejection mechanism extends into the mold interior of the lower mold.

[0006] As a further solution of the present invention: the lifting rod group includes a lifting support rod and a rod group fixing plate set at the tail end of the lifting support rod, the lifting support rod is provided with two and is respectively mounted on the left and right sides of the mold system, the lower mold mounting base plate is provided with a rod sleeve, the upper mold mounting base plate is provided with a fixing sleeve, the lifting support rod passes through the rod sleeve and the rod end is installed in the fixing sleeve.

[0007] As a further solution of the present invention: the limit assembly includes a top limit seat, a middle limit seat and a bottom limit seat, the bottom limit seat is arranged on both sides of the bottom of the bottom base frame, the middle limit seat is arranged on both sides of the middle of the bottom base frame, and the top limit seat is installed on both sides of the lower support frame, the top limit seat, the middle limit seat and the bottom limit seat are respectively provided with a first limit wheel group, a second limit wheel group and a third limit wheel group, the first limit wheel group, the second limit wheel group and the third limit wheel group are all composed of a group of pairs of wheels, and the rod body of the lifting support rod is passed through and limited between the pairs of wheels of the first limit wheel group, the second limit wheel group and the third limit wheel group.

[0008] As a further solution of the present invention: the extrusion drive assembly includes a driving support, a stable base installed on the driving support, and an eccentric wheel arranged on the stable base. The driving support is fixedly installed on the bottom frame, and a shaft sleeve is installed at the axis of the wheel body of the eccentric wheel. A driving machine shaft connected to the shaft sleeve is arranged in the mold frame.

[0009] As a further solution of the present invention: an upper edge plate and a contact roller installed on the upper edge plate are arranged on the top of the rod group fixing plate, and the contact roller is in contact with the wheel body of the eccentric wheel.

[0010] As a further solution of the present invention: the resistance roller includes a middle support shaft installed on the upper edge plate, a middle support block installed on the middle support shaft, and an outer rim sleeved on the periphery of the middle support block, the outer surface of the middle support block is provided with an inner ring hoop, and the inner ring hoop and the outer rim are directly filled with a plurality of balls.

[0011] The pressure reset assembly includes a reset fixing plate fixed on the bottom base frame, a reset support rod is arranged on the reset fixing plate, an insert sleeve is arranged at the bottom end of the rod group fixing plate, the insert sleeve is sleeved on the corresponding reset support rod, and an elastic seat is also fixed at the midline position of the reset fixing plate, the elastic seat is a telescopic structure and is installed with a support spring, and the support spring is supported at the bottom of the rod group fixing plate.

[0012] As a further solution of the present invention: the ejection mechanism includes a cylinder support installed between the lower support frame and the lower mold mounting base plate, and a telescopic cylinder is arranged on the cylinder support. The push rod of the telescopic cylinder extends into the mold of the lower mold, and the push rod is connected to the mold of the lower mold in a sealed manner.

[0013] As a further solution of the present invention: the top support buffer assembly includes a buffer top plate, a top base block is arranged at the bottom of the fixed sleeve, the rod end of the lifting support rod passes through the top base block and is provided with an extension rod, the extension rod is fixed to the plate body of the buffer top plate by a fixing bolt, and a buffer spring is wound around the periphery of the extension rod, and the buffer spring is supported between the buffer top plate and the top base block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The PVC foam board extrusion die of the present invention realizes high-speed and continuous extrusion of the PVC foam board through a precise die system and an efficient extrusion drive component, thereby improving production efficiency.

[0015] 2. During operation, the lifting rod assembly is driven to drive the upper mold mounting base and the upper mold to move downward to close the mold with the lower mold. The limit assembly is installed on the side edge of the mold system to ensure that the lifting rod assembly is stably lifted and lowered in the vertical diameter to avoid deviation or shaking.

[0016] 3. The mold system can automatically reset and prepare for the next extrusion operation. The design of the pressure reset component enables the mold system to provide buffering and reset functions when under pressure, protecting the mold from damage and enhancing the mold's adaptability to different extrusion conditions.

[0017] 4. This reset structure cooperates with the height-limited lifting rod group to ensure the stability and accuracy during the lifting process, avoids deviation or shaking, and ensures the operating accuracy of the mold system under long-term operation.

[0018] The invention ensures the dimensional accuracy and surface quality of the PVC foam board by the precise positioning and stability of the mold system, and meets the market demand for high-quality PVC foam boards while ensuring production efficiency.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and are used together with the specification to explain the principles of the present application. At the same time, these drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of a PVC foam board extrusion die provided in an embodiment of the present invention.

[0022] Figure 2 A schematic diagram of the installation of a mold system and a mold frame provided in an embodiment of the present invention.

[0023] Figure 3 A schematic diagram of the structure of the mold system provided in the embodiment of the present invention Figure 1 .

[0024] Figure 4 A schematic diagram of the structure of the mold system provided in the embodiment of the present invention Figure 2 .

[0025] Figure 5 A schematic structural diagram of an extrusion drive assembly provided in an embodiment of the present invention.

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of area A in the middle.

[0027] Figure 7 For the present invention Figure 4 Schematic diagram of the structure of area B in the middle.

[0028] Figure 8 A schematic structural diagram of a top support buffer assembly provided in an embodiment of the present invention.

[0029] In the figure: 1, bottom frame; 2, lower support frame; 3, lower mold mounting base plate; 4, lifting rod group; 5, upper mold mounting base plate; 6, extrusion drive assembly; 7, limit assembly; 8, top support buffer assembly; 9, pressure reset assembly; 10, mold system; 11, box frame bracket; 12, mold frame box; 13, upper mold; 14, lower mold; 15, working platform; 21, ejection mechanism; 211, cylinder support; 212, telescopic cylinder; 41, rod group fixing plate; 42, lifting support rod; 43, fixing sleeve; 44, rod sleeve; 45, upper edge plate; 46, contact roller; 47, plug-in sleeve; 4 61. Middle support block; 462. Middle support shaft; 463. Outer wheel rim; 464. Inner hoop; 465. Ball; 61. Drive support; 62. Stable base plate; 63. Eccentric wheel; 64. Shaft sleeve; 65. Drive shaft; 71. Top limit seat; 72. First limit wheel set; 73. Middle limit seat; 74. Second limit wheel set; 75. Bottom limit seat; 76. Third limit wheel set; 81. Top base block; 82. Buffer top plate; 83. Fixing bolt; 84. Extension rod; 85. Buffer spring; 91. Reset fixing plate; 92. Reset support rod; 93. Elastic seat; 94. Support spring. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0031] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0033] For example, see Figures 1 to 3, provides a PVC foam board extrusion mold, including a mold frame 12, a frame bracket 11 for supporting the mold frame 12, and a mold system 10 installed in the frame bracket 11, the top of the mold frame 12 is provided with a working platform 15, the top of the mold system 10 passes through the working platform 15 and is installed with an upper mold 13 and a lower mold 14; the main body of the mold system 10 is a bottom base frame 1, the top of the bottom base frame 1 is provided with a lower support frame 2, the top support of the lower support frame 2 is supported and installed with a lower mold mounting substrate 3, the lower mold 14 is fixedly installed on the lower mold mounting substrate 3, the mold system 10 also includes a lifting rod group 4, the top of the lifting rod group 4 extends to the top of the lower mold mounting substrate 3 and is installed with an upper mold mounting substrate 5, the upper mold 13 is fixedly installed on the upper mold mounting substrate 5.

[0034] The mold frame 12 is the main supporting structure of the entire mold system 10. It is designed to be sturdy and durable and can withstand the high pressure during the extrusion process. The frame bracket 11 is made of high-strength steel and fixed to the production line by welding or bolting to ensure that the mold frame 12 is stable and immobile. The working platform 15 is set on the top of the mold frame 12 and is made of non-slip material. The working platform 15 is equipped with relevant cooling tools and turnover tools to quickly cool the molded foam board and turn it to the next work station. It can also be equipped with necessary protective facilities, such as guardrails and emergency stop buttons, to ensure safety during operation.

[0035] The base frame 1 is the foundation of the entire mold system 10. It adopts a heavy steel structure to ensure the stability and load-bearing capacity of the entire mold system 10. The lower support frame 2 provides stable support for the lower mold mounting base plate 3. The lower mold mounting base plate 3 is installed on the top of the lower support frame 2 to facilitate the precise installation and positioning of the lower mold 14. The lower mold 14 is designed according to the extrusion requirements of the PVC foam board, with precise cavity and flow channel to ensure the quality and dimensional accuracy of the extruded product. The upper mold 13 cooperates with the lower mold 14 to form a complete extrusion cavity. The design of the upper mold 13 also takes into account the quality and dimensional accuracy of the extruded product. The lifting rod group 4 is used to realize the up and down movement of the upper mold mounting base plate 5. The design of the lifting rod group 4 takes into account stability and accuracy to ensure the precise alignment of the upper mold 13 and the lower mold 14 during the mold closing process.

[0036] Based on the above structure, this embodiment also includes the following key components: A limiting component 7 is provided on the side edge of the mold system 10, and the limiting component 7 is used to limit the lifting and lowering of the lifting rod group 4 in the vertical diameter direction; the limiting component 7 is installed on the side edge of the mold system 10, and its main function is to limit the lifting and lowering path of the lifting rod group 4, ensuring that the lifting rod group 4 is stably lifted and lowered in the vertical diameter direction to avoid deviation or shaking.

[0037] The bottom base frame 1 is provided with an extrusion drive assembly 6 for driving the lifting rod group 4 to move, and the bottom end of the bottom base frame 1 is also provided with a pressure reset assembly 9, the bottom of the lifting rod group 4 is supported between the pressure reset assembly 9 and the driving end of the extrusion drive assembly 6, and the top of the lifting rod group 4 is provided with a top support buffer assembly 8; the extrusion drive assembly 6 is started, and the lifting rod group 4 is driven to drive the upper mold mounting base plate 5 and the upper mold 13 to move downward and close the mold with the lower mold 14. The molten PVC material is extruded and molded in the mold cavity of the mold to form a PVC foam board, and after completing an extrusion cycle, the mold system 10 automatically resets and prepares for the next extrusion operation. The design of the pressure reset assembly 9 enables the mold system 10 to provide buffering and reset functions when it is under pressure, protects the mold from damage, and enhances the adaptability of the mold to different extrusion conditions. And this reset structure cooperates with the height-limited lifting rod group 4 to ensure stability and accuracy during the lifting process, avoids deviation or shaking, and ensures the operating accuracy of the mold system 10 under long-term operation.

[0038] Furthermore, in this embodiment, an ejection mechanism 21 is also provided on the lower support frame 2, and the ejection end of the ejection mechanism 21 extends into the interior of the lower mold 14. When the PVC foam board is completely cooled and shaped, the ejection mechanism 21 is started to eject the product from the mold.

[0039] For example 2, please refer to Figure 3 and Figure 4 Based on the contents of the above embodiment, the specific implementation structure of the lifting rod group 4 is designed as follows: The lifting rod group 4 includes a lifting support rod 42 and a rod group fixing plate 41 provided at the tail end of the lifting support rod 42. The rod group fixing plate 41 serves as a connection point between the lifting rod group 4 and the extrusion drive assembly 6. It is made of high-strength material and can withstand the huge pressure and driving force during the extrusion process to ensure the stable operation of the lifting rod group 4. The lifting support rod 42 is provided with two and is respectively mounted on the left and right sides of the mold system 10. The lifting support rod 42 is the main load-bearing and transmission component of the lifting rod group 4. It is made of high-quality alloy steel material with high strength, high rigidity and good wear resistance. A rod sleeve 44 is provided on the lower mold mounting base plate 3, and a fixing sleeve 43 is provided on the upper mold mounting base plate 5. The lifting support rod 42 passes through the rod sleeve 44 and the rod end is installed in the fixing sleeve 43 to ensure the precise alignment between the upper mold 13 and the lower mold 14.

[0040] The limiting assembly 7 includes a top limiting seat 71, a middle limiting seat 73 and a bottom limiting seat 75. The bottom limiting seat 75 is arranged on both sides of the bottom of the bottom base frame 1, the middle limiting seat 73 is arranged on both sides of the middle of the bottom base frame 1, and the top limiting seat 71 is installed on both sides of the lower support frame 2. The top limiting seat 71, the middle limiting seat 73 and the bottom limiting seat 75 are respectively provided with a first limiting wheel group 72, a second limiting wheel group 74 and a third limiting wheel group 76. The first limiting wheel group 72, the second limiting wheel group 74 and the third limiting wheel group 76 are all composed of a group of pairs of wheels. The rod body of the lifting support rod 42 is passed through and limited between the pairs of wheels of the first limiting wheel group 72, the second limiting wheel group 74 and the third limiting wheel group 76. The top limiting seat 71, the middle limiting seat 73 and the bottom limiting seat 75 are installed at different heights, and each limiting wheel set is composed of a pair of precision-machined wheels, with an appropriate gap between the wheels so that the rod body of the lifting support rod 42 can pass smoothly and be limited. The wheels of the limiting wheel set are made of wear-resistant materials to reduce friction and wear and increase service life.

[0041] The stable lifting and limiting mechanism of this embodiment ensures the continuity and efficiency of the extrusion process, improves production efficiency, and also helps to reduce the scrap rate and rework rate.

[0042] For example 3, please refer to Figure 4 , Figure 5 and Figure 6 Based on the contents of the above embodiment, the specific implementation structure of the extrusion drive assembly 6 is designed as follows: The extrusion drive assembly 6 includes a drive support 61, a stable base 62 mounted on the drive support 61, and an eccentric wheel 63 arranged on the stable base 62. The stable base 62 provides a stable mounting platform for the eccentric wheel 63. The stable base 62 is made of high-strength, high-rigidity materials to ensure that it can withstand huge driving forces and maintain the stability of the structure during the extrusion process. The eccentric wheel 63 is the core component of the extrusion drive assembly 6. A shaft sleeve 64 is installed at the axis of the wheel body, and is connected to the driver shaft 65 through the shaft sleeve 64. The eccentric design of the eccentric wheel 63 enables it to generate a reciprocating driving force when rotating, thereby driving the lifting rod group 4 to perform lifting and lowering movements. The shaft sleeve 64 serves as a connecting piece between the eccentric wheel 63 and the driver shaft 65. The shaft sleeve 64 ensures that the eccentric wheel 63 can rotate stably and transmit the driving force to the driver shaft 65. The driving machine shaft 65 is arranged in the mold frame 12 and connected to the shaft sleeve 64 to transmit the driving force generated by the eccentric wheel 63 to the lifting rod group 4. The driving machine shaft 65 is made of high-strength and wear-resistant materials to ensure that stable transmission performance can be maintained during long-term and high-load extrusion. The rod group fixing plate 41 serves as a fixed component of the lifting rod group 4, and an upper edge plate 45 is arranged on the top. The upper edge plate 45 is installed with a resistance roller 46, and the resistance roller 46 contacts the wheel body of the eccentric wheel 63. When the eccentric wheel 63 rotates, the up and down reciprocating motion of its wheel body will push the resistance roller 46, thereby driving the lifting rod group 4 to perform lifting motion.

[0043] The pressure reset assembly 9 includes a reset fixing plate 91 fixed on the bottom frame 1, a reset support rod 92 is arranged on the reset fixing plate 91, and a plug-in sleeve 47 is arranged at the bottom end of the rod group fixing plate 41, and the plug-in sleeve 47 is sleeved on the corresponding reset support rod 92, thereby providing a vertical guide and support for the rod group fixing plate 41. The reset support rod 92 is made of high-strength and wear-resistant materials to ensure that stable guiding performance can be maintained during long-term and high-load extrusion. The elastic seat 93 is fixed at the midline position of the reset fixing plate 91, providing a mounting platform for the support spring 94. The support spring 94 is installed between the elastic seat 93 and the rod group fixing plate 41. When the rod group fixing plate 41 is compressed, the support spring 94 will be compressed; when the pressure is released, the support spring 94 will use its elastic restoring force to push the rod group fixing plate 41 and the lifting rod group 4 thereon to reset. This design ensures that the mold system can be quickly and accurately reset after being compressed. The pressure reset assembly 9 ensures that the mold system 10 can be quickly and accurately reset after each cycle of operation through the guiding effect of the reset support rod 92 and the plug-in sleeve 47, as well as the elastic restoring force of the support spring 94, which helps to ensure the consistency of each extruded product.

[0044] In one case of this embodiment, the abutment roller 46 comprises a middle support shaft 462 mounted on the upper edge plate 45, a middle support block 461 mounted on the middle support shaft 462, and an outer wheel rim 463 sleeved on the periphery of the middle support block 461, which form a stable rotation axis as a whole, ensuring the smooth rotation of the abutment roller 46 when subjected to force. The outer surface of the middle support block 461 is provided with an inner hoop 464, and the inner hoop 464 and the outer wheel rim 463 are directly filled with a plurality of balls 465, forming a rolling contact surface. The use of the balls 465 greatly reduces the friction resistance, improves the transmission efficiency, and also helps to disperse the force, thereby extending the service life of the abutment roller 46.

[0045] When the eccentric wheel 63 rotates, the up and down reciprocating motion of its wheel body pushes the contact roller 46. Due to the presence of the ball 465, the contact roller 46 can contact the surface of the eccentric wheel 63 with low friction resistance, thereby transmitting the driving force to the lifting rod group 4. This rolling transmission method not only improves the transmission efficiency, but also reduces energy loss and wear, ensuring the smooth operation of the mold system 10 during the extrusion process.

[0046] Example 4, please refer to Figure 4 and Figure 7 Based on the contents of the above embodiment, the specific implementation structure of the lifting rod group 4 is designed as follows: The cylinder support 211 is firmly mounted between the lower support frame 2 and the lower mold mounting base plate 3, and serves as a supporting structure for the telescopic cylinder 212, ensuring that the telescopic cylinder 212 can maintain a stable thrust and precise stroke during operation. The telescopic cylinder 212 is mounted on the cylinder support 211, and its push rod extends into the mold of the lower mold 14. The telescopic cylinder 212 adopts a high-precision, high-stability cylinder design to ensure that the PVC foam board can be quickly and smoothly ejected from the mold after extrusion is completed. The push rod is connected to the mold of the lower mold 14 in a sealed port. This sealing design prevents gas and material leakage inside the mold, ensuring the stability of the extrusion process and product quality.

[0047] For example 5, please refer to Figure 3 and Figure 8 Based on the contents of the above embodiment, the specific implementation structure of the top support buffer assembly 8 is designed as follows: The top support buffer assembly 8 includes a buffer top plate 82, a top base block 81 is provided at the bottom of the fixed sleeve 43, the rod end of the lifting support rod 42 passes through the top base block 81 and is provided with an extension rod 84, the extension rod 84 is fixed to the plate body of the buffer top plate 82 by a fixing bolt 83, and a buffer spring 85 is wound around the periphery of the extension rod 84, and the buffer spring 85 is supported between the buffer top plate 82 and the top base block 81.

[0048] The design of the top support buffer assembly 8 effectively absorbs the impact force generated when the upper mold 13 descends, reduces the vibration and shaking of the mold system 10, and improves the stability of the mold. At the same time, it can reduce the impact force when the upper mold 13 contacts the lower mold 14, prevent the mold from being deformed or damaged due to excessive force, and extend the service life of the mold.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A PVC foam board extrusion die, comprising a die frame (12), a frame bracket (11) for supporting the die frame (12), and a die system (10) installed in the frame bracket (11), wherein a working platform (15) is provided on the top of the die frame (12), and an upper die (13) and a lower die (14) are installed on the top of the die system (10) through the working platform (15); characterized in that: The main body of the mold system (10) is a bottom base frame (1), a lower support frame (2) is arranged on the top of the bottom base frame (1), a lower mold mounting base plate (3) is supported and installed on the top of the lower support frame (2), and the lower mold (14) is fixedly mounted on the lower mold mounting base plate (3). The mold system (10) also includes a lifting rod group (4), the top of the lifting rod group (4) extends to the top of the lower mold mounting base plate (3) and is installed with an upper mold mounting base plate (5), and the upper mold (13) is fixedly mounted on the upper mold mounting base plate (5); A limiting component (7) is provided on the side edge of the mold system (10), and the limiting component (7) is used to limit the lifting and lowering of the lifting rod group (4) in the vertical radial direction; The bottom base frame (1) is provided with an extrusion drive assembly (6) for driving the lifting rod group (4) to move, and the bottom end of the bottom base frame (1) is also provided with a pressure reset assembly (9), the bottom of the lifting rod group (4) is supported between the pressure reset assembly (9) and the driving end of the extrusion drive assembly (6), and the top of the lifting rod group (4) is provided with a top support buffer assembly (8); The lower support frame (2) is also provided with an ejection mechanism (21), and an ejection end of the ejection mechanism (21) extends into the interior of the lower mold (14).

2. The PVC foam board extrusion die according to claim 1, characterized in that: The lifting rod group (4) comprises a lifting support rod (42) and a rod group fixing plate (41) provided at the rear end of the lifting support rod (42); two lifting support rods (42) are provided and are respectively mounted on the left and right sides of the mold system (10); a rod insertion sleeve (44) is provided on the lower mold mounting base plate (3); a fixing sleeve (43) is provided on the upper mold mounting base plate (5); the lifting support rod (42) passes through the rod insertion sleeve (44) and the rod end is installed in the fixing sleeve (43).

3. The PVC foam board extrusion die according to claim 2, characterized in that: The limiting assembly (7) comprises a top limiting seat (71), a middle limiting seat (73) and a bottom limiting seat (75); the bottom limiting seat (75) is arranged on both sides of the bottom of the bottom base frame (1); the middle limiting seat (73) is arranged on both sides of the middle of the bottom base frame (1); the top limiting seat (71) is installed on both sides of the lower support frame (2); the top limiting seat (71), the middle limiting seat (73) and the bottom limiting seat (75) are respectively provided with a first limiting wheel group (72), a second limiting wheel group (74) and a third limiting wheel group (76); the first limiting wheel group (72), the second limiting wheel group (74) and the third limiting wheel group (76) are all composed of a pair of wheels; the rod body of the lifting support rod (42) is passed through and limited between the pairs of wheels of the first limiting wheel group (72), the second limiting wheel group (74) and the third limiting wheel group (76).

4. The PVC foam board extrusion die according to claim 2, characterized in that: The extrusion drive assembly (6) comprises a drive support (61), a stable base (62) mounted on the drive support (61), and an eccentric wheel (63) arranged on the stable base (62); the drive support (61) is fixedly mounted on the base frame (1); a shaft fixing sleeve (64) is installed at the wheel axis of the eccentric wheel (63); and a drive machine shaft (65) connected to the shaft fixing sleeve (64) is arranged in the mold frame (12).

5. The PVC foam board extrusion die according to claim 4, characterized in that: An upper edge plate (45) and a contact roller (46) mounted on the upper edge plate (45) are provided on the top of the rod group fixing plate (41), and the contact roller (46) is in contact with the wheel body of the eccentric wheel (63).

6. The PVC foam board extrusion die according to claim 5, characterized in that: The abutment roller (46) comprises a middle support shaft (462) mounted on the upper edge plate (45), a middle support block (461) mounted on the middle support shaft (462), and an outer wheel rim (463) sleeved around the periphery of the middle support block (461); an inner hoop (464) is provided on the outer surface of the middle support block (461); and a plurality of balls (465) are directly filled in the inner hoop (464) and the outer wheel rim (463).

7. The PVC foam board extrusion die according to claim 5, characterized in that: The pressure-reset assembly (9) comprises a reset fixing plate (91) fixed on the base frame (1), a reset support rod (92) being arranged on the reset fixing plate (91), an insertion sleeve (47) being arranged at the bottom end of the rod group fixing plate (41), the insertion sleeve (47) being sleeved on the corresponding reset support rod (92), and an elastic seat (93) being fixed at the midline position of the reset fixing plate (91), the elastic seat (93) being a telescopic structure and being installed with a support spring (94), the support spring (94) being supported on the bottom of the rod group fixing plate (41).

8. The PVC foam board extrusion die according to claim 1, characterized in that: The ejection mechanism (21) comprises a cylinder support (211) mounted between a lower support frame (2) and a lower mold mounting base plate (3); a telescopic cylinder (212) is arranged on the cylinder support (211); a push rod of the telescopic cylinder (212) extends into the interior of the lower mold (14); and the push rod is connected to the mold of the lower mold (14) in a sealed manner.

9. The PVC foam board extrusion die according to claim 2, characterized in that: The top support buffer assembly (8) comprises a buffer top plate (82), a top base block (81) is arranged at the bottom of the fixing sleeve (43), a rod end of the lifting support rod (42) passes through the top base block (81) and is provided with an extension rod (84), the extension rod (84) is fixed to the plate body of the buffer top plate (82) through a fixing bolt (83), a buffer spring (85) is wound around the periphery of the extension rod (84), and the buffer spring (85) is supported between the buffer top plate (82) and the top base block (81).

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