A PVC foam board extrusion die

Abstract

The present invention relates to the technical field of foamed board production, specifically a PVC foamed board extrusion die, which includes a die frame box, a box frame support for supporting the die frame box, and a die system installed in the box frame support. The top of the die system passes through the operation platform and is installed with an upper die and a lower die; 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, and a lower die installation substrate is supported and installed on the top of the lower support frame. The die system also includes a lifting rod group, the top of the lifting rod group extends above the lower die installation substrate and is installed with an upper die installation substrate. A limiting component is arranged on the side edge of the die system, and the limiting component is used to limit the lifting rod group to lift vertically and radially. The present invention ensures the dimensional accuracy and surface quality of the PVC foamed board with the precise positioning and stability of the die system, and meets the market demand for high-quality PVC foamed boards while ensuring production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of foamed board production, and specifically to a PVC foamed board extrusion die. Background Art

[0002] In the plastic processing industry, PVC foamed boards are widely used due to their excellent properties such as light weight, heat insulation, sound insulation, and corrosion resistance. Chinese Patent (Authorized Publication No.: CN117283833B) discloses an extrusion die for PVC foamed boards. The designed extrusion structure includes a resisting rod, 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. One end of the clamping area is also provided with a first spring, 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. This patent adopts a scissor-type extrusion structure, and there will be an inclination deviation in the force application direction in this structure, resulting in a deviation in the closing accuracy between the upper and lower dies. In the case of long-term operation, this deviation will become larger and larger. Therefore, in actual production, it is easier to cause defective products and affect the yield of the production line. Summary of the Invention

[0004] The purpose of the present invention is to provide a PVC foamed board extrusion die to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A PVC foamed board extrusion die, comprising a die frame box, a box frame support for supporting the die frame box, and a die system installed in the box frame support. An operation platform is arranged at the top of the die frame box. The top of the die system passes through the operation platform and is installed with an upper die and a lower die. The main body of the die system is a bottom base frame. A lower support frame is arranged at the top of the bottom base frame. The top of the lower support frame is supported and installed with a lower die mounting substrate. The lower die is fixedly installed on the lower die mounting substrate. The die system further includes a lifting rod group. The top of the lifting rod group extends above the lower die mounting substrate and is installed with an upper die mounting substrate. The upper die is fixedly installed on the upper die mounting substrate. A limiting component is arranged along the side of the die system. The limiting component is used to limit the lifting rod group to lift vertically in the radial direction. An extrusion driving component for driving the movement of the lifting rod group is arranged on the bottom base frame. A pressure receiving and resetting component is further arranged at the bottom end of the bottom base frame. The bottom of the lifting rod group is supported between the pressure receiving and resetting component and the driving end of the extrusion driving component. A top support and buffer component is arranged at the top of the lifting rod group. A top ejecting part is further arranged on the lower support frame. The top ejecting end of the top ejecting part extends into the die interior of the lower die.

[0007] As a further scheme of the present invention: The lifting rod group includes lifting support rods and a rod group fixing plate arranged at the tail end of the lifting support rods. There are two lifting support rods which are respectively arranged on the left and right sides of the die system. A rod passing sleeve is arranged on the lower die mounting substrate. A fixing sleeve is arranged on the upper die mounting substrate. The lifting support rods pass through the rod passing sleeve and the rod ends are installed in the fixing sleeves.

[0008] As a further scheme of the present invention: The limiting component includes a top limiting seat, a middle limiting seat and a bottom limiting seat. The bottom limiting seat is arranged on both sides of the bottom of the bottom base frame. The middle limiting seat is arranged on both sides of the middle of the bottom base frame. The top limiting seat is installed on both sides of the lower support frame. The top limiting seat, the middle limiting seat and the bottom limiting seat are respectively provided with a first limiting wheel group, a second limiting wheel group and a third limiting wheel group. The first limiting wheel group, the second limiting wheel group and the third limiting wheel group are each composed of a pair of wheels. The rod body of the lifting support rod passes through and is limited between the pairs of wheels of the first limiting wheel group, the second limiting wheel group and the third limiting wheel group.

[0009] As a further scheme of the present invention: The extrusion driving component includes a driving support, a stable base plate installed on the driving support, and an eccentric wheel arranged on the stable base plate. The driving support is fixedly installed on the bottom base frame. A shaft fixing sleeve is installed at the axis of the wheel body of the eccentric wheel. A driving machine shaft connected to the shaft fixing sleeve is arranged in the die frame box.

[0010] As a further scheme of the present invention: An upper edge plate and a contact roller installed on the upper edge plate are arranged at the top of the rod group fixing plate. The contact roller is in contact with the wheel body of the eccentric wheel.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The present invention ensures the dimensional accuracy and surface quality of PVC foam boards with the precise positioning and stability of the mold system, meeting the market demand for high-quality PVC foam boards while ensuring production efficiency.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this application. Brief Description of the Drawings

[0022] The drawings herein are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application and used together with the specification to explain the principles of this application. At the same time, these drawings and the text description are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the PVC foam board extrusion mold provided by an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the installation of the mold system and the mold rack provided by an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the mold system provided by an embodiment of the present invention Figure 1 .

[0026] Figure 4 It is a schematic diagram of the structure of the mold system provided by an embodiment of the present invention Figure 2 .

[0027] Figure 5 It is a schematic diagram of the structure of the extrusion drive assembly provided by an embodiment of the present invention.

[0028] Figure 6 For the present invention Figure 5 It is a schematic diagram of the structure of area A.

[0029] Figure 7 For the present invention Figure 4 It is a schematic diagram of the structure of area B.

[0030] Figure 8 It is a schematic diagram of the structure of the top support buffer assembly provided by an embodiment of the present invention.

[0031] In the figure: 1, base frame; 2, lower support frame; 3, lower die mounting substrate; 4, lifting rod group; 5, upper die mounting substrate; 6, extrusion drive assembly; 7, limit assembly; 8, top support buffer assembly; 9, compression reset assembly; 10, die system; 11, box frame support; 12, die frame box; 13, upper die; 14, lower die; 15, operation platform; 21, ejecting member; 211, cylinder support; 212, telescopic cylinder; 41, rod group fixing plate; 42, lifting support rod; 43, fixed sleeve; 44, through rod sleeve; 45, upper edge plate; 46, contact roller; 47, insertion sleeve; 461, 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 fixing sleeve; 65, drive motor shaft; 71, top limit seat; 72, first limit wheel group; 73, middle limit seat; 74, second limit wheel group; 75, bottom limit seat; 76, third limit wheel group; 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 implementation mode

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0033] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The following will describe the specific implementation of the present invention in detail with reference to specific embodiments.

[0035] Example 1, please refer to Figures 1 - 3, a PVC foamed board extrusion die is provided, which includes a die frame box 12, a box frame support 11 for supporting the die frame box 12, and a die system 10 installed in the box frame support 11. An operation platform 15 is arranged at the top of the die frame box 12. The top of the die system 10 passes through the operation platform 15 and is installed with an upper die 13 and a lower die 14; the main body of the die system 10 is a bottom base frame 1. A lower support frame 2 is arranged at the top of the bottom base frame 1. The top of the lower support frame 2 supports and installs a lower die mounting substrate 3. The lower die 14 is fixedly installed on the lower die mounting substrate 3. The die system 10 further includes a lifting rod group 4. The top of the lifting rod group 4 extends above the lower die mounting substrate 3 and is installed with an upper die mounting substrate 5. The upper die 13 is fixedly installed on the upper die mounting substrate 5.

[0036] The die frame box 12 serves as the main support structure of the entire die system 10. It is designed to be strong and durable and can withstand the high pressure during the extrusion process. The box frame support 11 is made of high-strength steel and is fixed to the production line by welding or bolt connection to ensure that the die frame box 12 is stable and immovable. The operation platform 15 is arranged at the top of the die frame box 12 and is made of anti-slip material. Relevant cooling tools and turnover tools are equipped on the operation platform 15 to quickly cool the formed foamed board and turnover it to the next operation station. Necessary protective facilities such as guardrails and emergency stop buttons can also be equipped to ensure the safety during the operation process.

[0037] The bottom base frame 1 is the foundation of the entire die system 10 and is made of heavy steel structure to ensure the stability and load-bearing capacity of the entire die system 10. The lower support frame 2 provides stable support for the lower die mounting substrate 3. The lower die mounting substrate 3 is installed at the top of the lower support frame 2 to facilitate the precise installation and positioning of the lower die 14. The lower die 14 is designed according to the extrusion requirements of the PVC foamed board and has precise cavities and runners to ensure the quality and dimensional accuracy of the extruded product. The upper die 13 cooperates with the lower die 14 to form a complete extrusion cavity. The design of the upper die 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 die mounting substrate 5. The design of the lifting rod group 4 takes into account stability and accuracy to ensure the precise alignment of the upper die 13 and the lower die 14 during the mold closing process.

[0038] On the basis of the above structure, this embodiment further includes the following key components:

[0039] A limiting component 7 is arranged on the side edge of the die system 10. The limiting component 7 is used to limit the vertical and radial lifting of the lifting rod group 4; the limiting component 7 is installed on the side edge of the die system 10, and its main function is to limit the lifting path of the lifting rod group 4 to ensure the stable lifting of the lifting rod group 4 in the vertical and radial directions and avoid deviation or shaking.

[0040] An extrusion driving assembly 6 for driving the movement of the lifting rod group 4 is provided on the bottom base frame 1. A compression reset assembly 9 is further provided at the bottom end of the bottom base frame 1. The bottom of the lifting rod group 4 is supported between the compression reset assembly 9 and the driving end of the extrusion driving assembly 6. A top support buffer assembly 8 is provided at the top of the lifting rod group 4. When the extrusion driving assembly 6 is started, it drives the lifting rod group 4 to drive the upper die mounting substrate 5 and the upper die 13 to move downward to close the die with the lower die 14. The molten PVC material is extruded and formed in the cavity of the die to form a PVC foam board. After completing one extrusion cycle, the die system 10 automatically resets to prepare for the next extrusion operation. The design of the compression reset assembly 9 enables the die system 10 to provide buffering and reset functions when under pressure, protecting the die from damage and enhancing the adaptability of the die to different extrusion conditions. And this reset structure, combined with the lifting rod group 4 with height limit, ensures the stability and precision during the lifting process, avoids deviation or shaking, and guarantees the operation precision of the die system 10 during long-term operation.

[0041] Furthermore, in this embodiment, an ejecting member 21 is further provided on the lower support frame 2. The ejecting end of the ejecting member 21 extends into the interior of the lower die 14. When the PVC foam board is completely cooled and shaped, the ejecting member 21 is started to eject the product from the die.

[0042] Embodiment Two, please refer to Figure 3 and Figure 4 , based on the content described in the above embodiment, for the specific implementation structure of the lifting rod group 4, this embodiment is designed as follows:

[0043] The lifting rod group 4 includes lifting support rods 42 and a rod group fixing plate 41 provided at the tail end of the lifting support rods 42. The rod group fixing plate 41 serves as the connection point between the lifting rod group 4 and the extrusion driving assembly 6 and is made of high-strength material, capable of withstanding the huge pressure and driving force during the extrusion process to ensure the stable operation of the lifting rod group 4. Two lifting support rods 42 are provided and are respectively arranged on the left and right sides of the die system 10. The lifting support rods 42 are the main load-bearing and transmission components of the lifting rod group 4 and are made of high-quality alloy steel material, having high strength, high rigidity and good wear resistance. A rod passing sleeve 44 is provided on the lower die mounting substrate 3, and a fixing sleeve 43 is provided on the upper die mounting substrate 5. The lifting support rods 42 pass through the rod passing sleeve 44 and the rod ends are installed in the fixing sleeve 43 to ensure the precise alignment between the upper die 13 and the lower die 14.

[0044] 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.

[0045] 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.

[0046] 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:

[0047] The extrusion driving assembly 6 includes a driving support 61, a stable base plate 62 mounted on the driving support 61, and an eccentric wheel 63 disposed on the stable base plate 62. The stable base plate 62 provides a stable mounting platform for the eccentric wheel 63. The stable base plate 62 is made of a material with high strength and high rigidity to ensure that it can withstand huge driving forces during the extrusion process and maintain the structural stability. The eccentric wheel 63 is the core component of the extrusion driving assembly 6. A shaft fixing sleeve 64 is installed at the axis of its wheel body and is connected to the driving machine shaft 65 through the shaft fixing sleeve 64. The eccentric design of the eccentric wheel 63 enables it to generate an up-and-down reciprocating driving force during rotation, thereby driving the lifting rod group 4 to perform lifting motion. The shaft fixing sleeve 64, as a connecting member between the eccentric wheel 63 and the driving machine shaft 65, ensures that the eccentric wheel 63 can rotate stably and transmit the driving force to the driving machine shaft 65. The driving machine shaft 65 is disposed within the mold frame box 12 and is connected to the shaft fixing 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 a material with high strength and wear resistance to ensure stable transmission performance during long-term and high-load extrusion processes. The rod group fixing plate 41, as a fixing component of the lifting rod group 4, has an upper edge plate 45 provided at its top. A contact roller 46 is installed on the upper edge plate 45, and the contact roller 46 is in contact with 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 contact roller 46, thereby driving the lifting rod group 4 to perform lifting motion.

[0048] The compression and reset assembly 9 includes a reset fixing plate 91 fixed to the bottom base frame 1. A reset support rod 92 is provided on the reset fixing plate 91. An insertion sleeve 47 is provided at the bottom end of the rod group fixing plate 41, and the insertion sleeve 47 is sleeved on the corresponding reset support rod 92, thereby providing a vertical direction guidance and support for the rod group fixing plate 41. The reset support rod 92 is made of a material with high strength and wear resistance to ensure stable guiding performance during long-term and high-load extrusion processes. A spring 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 spring seat 93 and the rod group fixing plate 41. When the rod group fixing plate 41 is pressed, 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 pressed. The compression and reset assembly 9, through the guiding action of the reset support rod 92 and the insertion sleeve 47, and the elastic restoring force of the support spring 94, ensures that the mold system 10 can be quickly and accurately reset after each cycle of operation, which helps to ensure the consistency of each extruded product.

[0049] In a case of this embodiment, the abutting roller 46 includes a middle support shaft 462 installed on the upper edge plate 45, a middle support block 461 installed on the middle support shaft 462, and an outer wheel rim 463 sleeved around the periphery of the middle support block 461, forming a stable rotation axis as a whole, ensuring the smooth rotation of the abutting roller 46 when stressed. An inner ring hoop 464 is provided on the outer surface of the middle support block 461, and a number of ball bearings 465 are directly filled between the inner ring hoop 464 and the outer wheel rim 463, forming a rolling contact surface. The adoption of the ball bearings 465 greatly reduces the frictional resistance, improves the transmission efficiency, and also helps to disperse the stress, extending the service life of the abutting roller 46.

[0050] When the eccentric wheel 63 rotates, the up-and-down reciprocating motion of its wheel body will push the abutting roller 46. Due to the existence of the ball bearings 465, the abutting roller 46 can contact the surface of the eccentric wheel 63 with a lower frictional 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 the energy loss and wear, ensuring the smooth operation of the mold system 10 during the extrusion process.

[0051] Embodiment 4, please refer to Figure 4 and Figure 7 , based on the content described in the above embodiments, for the specific implementation structure of the lifting rod group 4, this embodiment is designed as follows:

[0052] The cylinder support 211 is firmly installed between the lower support frame 2 and the lower mold mounting substrate 3, serving as the support structure of the telescopic cylinder 212, ensuring that the telescopic cylinder 212 can maintain a stable thrust and an accurate stroke during the working process. The telescopic cylinder 212 is installed on the cylinder support 211, and its push rod extends into the mold interior of the lower mold 14. The telescopic cylinder 212 adopts a high-precision and high-stability cylinder design to ensure that the PVC foam board can be quickly and smoothly ejected from the mold after the extrusion is completed. The push rod is connected to the mold of the lower mold 14 in a sealed connection, and this sealing design prevents the gas and materials inside the mold from leaking, ensuring the stability of the extrusion process and the product quality.

[0053] Embodiment 5, please refer to Figure 3 and Figure 8 , based on the content described in the above embodiments, for the specific implementation structure of the top support buffer assembly 8, this embodiment is designed as follows:

[0054] 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. 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.

[0055] The design of the top support buffer component 8 effectively absorbs the impact force generated when the upper die 13 descends, reduces the vibration and sway of the die system 10, and improves the stability of the die. At the same time, it can reduce the impact force when the upper die 13 contacts the lower die 14, prevent the die from deforming or being damaged due to excessive force, and extend the service life of the die.

[0056] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0057] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 ejector component (21), and an ejector end of the ejector component (21) extends into the interior of the lower mold (14); The lifting rod group (4) comprises a lifting rod (42) and a rod group fixing plate (41) provided at the rear end of the lifting rod (42); two lifting 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 rod (42) passes through the rod insertion sleeve (44) and the rod end is installed in the fixing sleeve (43); 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 set 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 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 bottom 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); 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); 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); 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); 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).

2. 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.

3. 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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