A GPPS sheet extrusion die

Abstract

The present invention relates to the field of mold technology, and specifically discloses an extrusion molding mold for a GPPS sheet, including a mold body, the mold body including a first center block, a first front module and a first rear module, there are a plurality of first center blocks, first front modules and first rear modules, all of the first center blocks, first front modules and first rear modules are provided with fixing holes, and bolts are provided in the fixing holes. When the discharge port needs to be replaced, the present invention only needs to replace the first rear module, and does not need to replace the entire mold body, which is simpler and more convenient; and does not require too many spare sets of molds, saving resources, and when the mold body is damaged, the damaged part can be replaced and repaired, and does not need to replace the entire mold body, saving the use cost.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to an extrusion molding mold for a GPPS plate. Background Art

[0002] GPPS is general purpose polystyrene. General purpose polystyrene (PS) is polymerized from styrene monomer (SM) and can be polymerized by a variety of synthetic methods. The main methods used in industry are bulk polymerization and suspension polymerization. The English name of polystyrene is Polystyrene, referred to as PS. PS is a thermoplastic non-crystalline resin, mainly divided into general-purpose polystyrene (GPPS, commonly known as transparent benzene), high-impact polystyrene (HIPS, commonly known as modified benzene) and expanded polystyrene (EPS).

[0003] When GPPS sheets are produced, they are generally extruded using extrusion dies. When producing GPPS sheets of different types or sizes, the entire set of dies needs to be replaced. Manufacturers need to have many spare sets of dies, which takes up a lot of resources. In addition, the entire set of dies is heavy, making it difficult to operate when replacing the dies. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an extrusion molding die for a GPPS sheet.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A GPPS plate extrusion forming die comprises a die body, wherein the die body comprises a first center block, a first front module and a first rear module, wherein there are a plurality of first center blocks, first front modules and first rear modules, wherein the first front module closest to the first center block is the first front module, followed by the first front module, and the first front module farthest from the first center block is provided with a feed port, the first rear module closest to the first center block is the first rear module, followed by the first rear module, and the first rear module farthest from the first center block is provided with a discharge port, and all the first center blocks, first front modules and first rear modules are provided with fixing holes, and bolts are provided in the fixing holes.

[0007] Preferably, a center block inner ring is provided on the inner side of the first center block, and a front module inner ring is provided on the inner side of the first front module. The cross-sectional area of ​​the front module inner ring gradually increases from a direction away from the first center block to a direction close to the first center block, and the cross-sectional area of ​​the rear module inner ring gradually increases from a direction away from the first center block to a direction close to the first center block. All the center block inner rings, front module inner rings and rear module inner rings form a chamber with a conical cross-section.

[0008] Preferably, the mold body further comprises a second central block, a second front module and a second rear module, the second central block and the first central block have the same size, and the second front module and the second rear module have the same fixing holes.

[0009] Preferably, the same group of mold bodies is provided with multiple first center blocks, wherein one side of the center block inner ring of some of the first center blocks can cooperate with one side of the first front module, and the other side can cooperate with one side of the first rear module, and one side of the center block inner ring of some of the first center blocks can cooperate with one side of the first front module, and the other side can cooperate with one side of the first rear module.

[0010] Preferably, the feed inlet is fixed to the first front module by fixing bolts, and the discharge outlet is fixed to the first rear module by fixing bolts.

[0011] Preferably, a baffle is provided in the middle of the first center block and the second center block, and the baffle is rotatably installed in the first center block or the second center block.

[0012] Preferably, a rotating cap is provided on the top of the first center block and the second center block, and a rotating shaft is fixedly connected to the bottom of the rotating cap. The rotating shaft passes through the top of the first center block or the second center block and is rotatably connected to the first center block or the second center block. A rotating plate is fixedly connected to the bottom of the rotating shaft, and the bottom of the rotating plate is fixedly connected to the baffle.

[0013] Preferably, a pointing rod is provided on the top of the rotating cap, and the length direction of the pointing rod is the same as the length direction of the blocking piece.

[0014] Preferably, pressure sensors are provided at the inner bottoms of the first center block and the second center block.

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

[0016] In the present invention, the mold body is arranged to be composed of multiple first center blocks, multiple first front modules and multiple first rear modules. When it is necessary to produce GPPS sheets of greater thickness, the long screws in the fixing holes are removed, and then all the first rear modules are removed, and the second rear module is installed on the first center block and then fixed with bolts. Since the first center block and the second center block have the same size, the second rear module can abut against one side of the first center block. Therefore, when it is necessary to replace the discharge port, only the first rear module needs to be replaced, and there is no need to replace the entire mold body, which is simpler and more convenient. There is no need for too many spare sets of molds, which saves resources. When the mold body is damaged, the bad part can be replaced and repaired, and there is no need to replace the entire mold body, which saves the use cost.

[0017] In the present invention, the taper of the chamber formed inside the second rear module is greater than the taper of the chamber formed inside the first rear module. When the GPPS fluid passes through the chamber formed by the second rear module, it is easier to flow out from the corresponding discharge port. When thicker GPPS sheets are produced without changing the feeding equipment, the efficiency of the fluid passing through the discharge port is also increased accordingly, that is, the flow efficiency is low when producing thin GPPS sheets, and the flow efficiency is high when producing thick GPPS sheets. This can make the quality of the produced sheets more uniform and can adapt to the production of GPPS sheets of different thicknesses.

[0018] In the present invention, if the internal space of the chamber needs to be increased, the bolts in the fixing holes are removed, and a plurality of first center blocks of the same size are installed to increase the volume of the internal chamber of the mold body; when producing GPPS fluid with poor fluidity, the redundant first center blocks are removed, and the first front modules and the first rear modules are removed in pairs, which can reduce the volume of the chamber, thereby reducing the resistance of the GPPS fluid and facilitating the outflow of the GPPS fluid through the discharge port. When the size of the mold body needs to be adjusted, the overall length of the mold body can also be adjusted by increasing or decreasing the number of first center blocks, or the number of first front modules and first rear modules.

[0019] In the present invention, by setting a rotating cap, a rotating shaft, a rotating plate, and a baffle, when the fluid passes through the chamber, the pressure sensor can detect the pressure of the fluid in the chamber. When the pressure of the fluid in the chamber is relatively small, the staff can rotate the rotating cap to drive the baffle to rotate, so that the baffle blocks the GPPS fluid flowing through, thereby increasing the resistance to fluid flow, and then reducing the speed of GPPS fluid outflow to a certain extent, thereby increasing the pressure in the chamber and making the GPPS fluid outflow more uniform; when the baffle is not needed to block the fluid, the staff rotates the rotating cap so that the length direction of the baffle is the same as the flow direction of the GPPS fluid, which can play a role in guiding the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall front-end structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall back-end structure of the present invention;

[0022] Figure 3 is a cross-sectional view of a first front module and a first rear module of the present invention;

[0023] Figure 4 is a cross-sectional view of a second front module and a second rear module of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the first central block of the present invention;

[0025] Figure 6It is a schematic diagram of the first rear module structure of the present invention.

[0026] In the figure: 1. mold body; 2. first center block; 3. first front module; 4. first rear module; 5. feed port; 6. discharge port; 7. rotating cap; 8. pointing rod; 9. fixing hole; 10. rotating plate; 11. baffle; 12. inner ring of center block; 13. inner ring of front module; 14. inner ring of rear module; 15. pressure sensor; 16. second center block; 17. second front module; 18. second rear module. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-6 A GPPS sheet extrusion molding die comprises a die body 1, the die body 1 comprises a first center block 2, a first front module 3 and a first rear module 4, there are several first center blocks 2, first front modules 3 and first rear modules 4, the first front module 3 closest to the first center block 2 is the first front module 3a, the second is the first front module 3b, the first front module 3 farthest from the first center block 2 is provided with a feed port 5, the first rear module 4 closest to the first center block 2 is the first rear module 4a, the second is the first rear module 4b, the first rear module 4 farthest from the first center block 2 is provided with a discharge port 6, all the first center blocks 2, the first front modules 3 and the first rear modules 4 are provided with fixing holes 9, bolts are provided in the fixing holes 9; the die body 1 also comprises a second center block 16, a second front module 17 and a second rear module 18, the second center block 16 has the same size as the first center block 2, and the fixing holes 9 on the second front module 17 and the second rear module 18 are the same. Since the mold body 1 is composed of multiple first center blocks 2, multiple first front modules 3 and multiple first rear modules 4, when it is necessary to produce GPPS sheets of greater thickness, remove the long screws in the fixing holes 9, then remove all the first rear modules 4, install the second rear module 18 on the first center block 2, and then fix it with bolts. Since the first center block 2 and the second center block 16 have the same size, the second rear module 18a can abut against one side of the first center block 2; therefore, when it is necessary to replace the discharge port 6, it is only necessary to replace the first rear module 4, and there is no need to replace the entire mold body 1, which is simpler and more convenient; and there is no need for too many spare sets of molds, which saves resources, and when the mold body 1 is damaged, the bad part can be replaced and repaired, and there is no need to replace the entire mold body 1, which saves the cost of use.

[0029] As a technical optimization solution of the present invention, a center block inner ring 12 is provided on the inner side of the first center block 2, and a front module inner ring 13 is provided on the inner side of the first front module 3. The cross-sectional area of ​​the front module inner ring 13 gradually increases from a direction away from the first center block 2 to a direction close to the first center block 2, and the cross-sectional area of ​​the rear module inner ring 14 gradually increases from a direction away from the first center block 2 to a direction close to the first center block 2. All the center block inner rings 12, front module inner rings 13 and rear module inner rings 14 form a chamber with a conical cross-section. The thickness of the discharge port 6 on the second rear module 18 is greater than the thickness of the discharge port 6 on the first rear module 4, and the widths are the same, and the distance from the second center block 16 to the corresponding discharge port 6 is greater than the distance from the first center block 2 to the corresponding discharge port 6. Therefore, the taper of the chamber formed inside the second rear module 18 is greater than the taper of the chamber formed inside the first rear module 4. When the GPPS fluid passes through the chamber formed by the second rear module 18, it is easier to flow out from the corresponding discharge port 6. When producing thicker GPPS sheets without changing the feeding equipment, its efficiency passing through the discharge port 6 is also increased accordingly, that is, the flow efficiency is low when producing thin GPPS sheets, and the flow efficiency is high when producing thick GPPS sheets, which can make the quality of the produced sheets more uniform and can adapt to the production of GPPS sheets of different thicknesses.

[0030] As a technical optimization solution of the present invention, the same group of mold bodies 1 is provided with multiple first center blocks 2, wherein one side of the center block inner ring 12 of some of the first center blocks 2 can cooperate with one side of the first front module 3b, and the other side can cooperate with one side of the first rear module 4b, and one side of the center block inner ring 12 of some of the first center blocks 2 can cooperate with one side of the first front module 3c, and the other side can cooperate with one side of the first rear module 4c, the feed port 5 is fixed to the first front module 3 by fixing bolts, and the discharge port 6 is fixed to the first rear module 4 by fixing bolts. When producing different types of GPPS, the fluidity of different types of GPPS will be different. When using GPPS materials with better fluidity, the internal space of the chamber needs to be increased, and the GPPS materials are mixed evenly in the chamber to reduce the flow rate so that they flow out from the discharge port 6 more evenly and slowly to ensure the quality of the GPPS sheet. At this time, the bolts in the fixing holes 9 are removed, and multiple first center blocks 2 of the same size are installed to increase the volume of the internal chamber of the mold body 1; when producing GPPS fluids with poor fluidity, the redundant first center blocks 2 are removed, and the first front modules 3 and the first rear modules 4 are removed in pairs, such as removing the first front modules 3a and the first rear modules 4a at the same time, and then installing the corresponding more The first center block 2 with a changed size is arranged so that the first center block 2 can be located between the first front module 3b and the first rear module 4b, or the first front module 3a, the first front module 3b, the first rear module 4a and the first rear module 4b are removed at the same time, and the first center block 2 with a corresponding changed size is installed so that the first center block 2 can be located between the first front module 3c and the first rear module 4c, thereby reducing the volume of the chamber, thereby reducing the resistance of the GPPS fluid, and facilitating the GPPS fluid to flow out through the discharge port 6. When it is necessary to adjust the size of the mold body 1, the overall length of the mold body 1 can also be adjusted by increasing or decreasing the number of the first center blocks 2, or the number of the first front modules 3 and the first rear modules 4.

[0031] As a technical optimization scheme of the present invention, a baffle 11 is provided in the middle of the first center block 2 and the second center block 16, and the baffle 11 is rotatably installed in the first center block 2 or the second center block 16. A rotating cap 7 is provided on the top of the first center block 2 and the second center block 16, and a rotating shaft is fixedly connected to the bottom of the rotating cap 7. The rotating shaft passes through the top of the first center block 2 or the second center block 16 and is rotatably connected to the first center block 2 or the second center block 16. A rotating plate 10 is fixedly connected to the bottom of the rotating shaft, and the bottom of the rotating plate 10 is fixedly connected to the baffle 11. Pressure sensors 15 are provided on the inner bottom of the first center block 2 and the second center block 16. When the fluid passes through the chamber, the pressure sensor 15 can detect the pressure of the fluid in the chamber, so as to determine whether the fluid pressure in the chamber meets the production requirements. When the fluid pressure in the chamber is too low, the staff can rotate the rotating cap 7 to drive the rotating shaft and the rotating plate 10 to rotate, thereby driving the baffle 11 to rotate, so that the baffle 11 blocks the GPPS fluid flowing through, thereby increasing the resistance to fluid flow, and then reducing the speed of GPPS fluid outflow to a certain extent, thereby increasing the pressure in the chamber and making the GPPS fluid outflow more uniform; when the baffle 11 is not needed to block the fluid, the staff rotates the rotating cap 7 to drive the rotating shaft, the rotating plate 10 and the baffle 11 to rotate, so that the length direction of the baffle 11 is the same as the flow direction of the GPPS fluid, which can play a role in guiding the flow.

[0032] As a technical optimization solution of the present invention, a pointing rod 8 is provided on the top of the rotating cap 7, and the length direction of the pointing rod 8 is the same as the length direction of the baffle 11. The pointing rod 8 is convenient for the staff to judge the direction of the baffle 11.

[0033] When the present invention is used, firstly, a suitable mold body 1 is selected and installed on the GPPS extrusion equipment and fixed by a clamp or bolt, the feed pipe is connected to the feed port 5, and a heating and cooling device is installed, and then the work can be started. The pressure sensor 15 is also connected to a display, and the pressure in the chamber can be directly read.

[0034] The heated GPPS fluid enters the chamber through the feed port 5, fills the chamber, and then flows out from the discharge port 6. The discharge port 6 is flat, so the GPPS material extruded through the discharge port 6 is a sheet.

[0035] When the discharge port 6 remains unchanged, the distance between the first center block 2 and the discharge port 6 and the taper of the conical chamber between the first center block 2 and the discharge port 6 will affect the discharge efficiency of the discharge port 6 .

[0036] Since the mold body 1 is composed of multiple first center blocks 2, multiple first front modules 3 and multiple first rear modules 4, when it is necessary to produce GPPS sheets of greater thickness, remove the long screws in the fixing holes 9, then remove all the first rear modules 4, install the second rear module 18 on the first center block 2, and then fix it with bolts. Since the first center block 2 and the second center block 16 have the same size, the second rear module 18a can abut against one side of the first center block 2; therefore, when it is necessary to replace the discharge port 6, it is only necessary to replace the first rear module 4, and there is no need to replace the entire mold body 1, which is simpler and more convenient; and there is no need for too many spare sets of molds, which saves resources, and when the mold body 1 is damaged, the bad part can be replaced and repaired, and there is no need to replace the entire mold body 1, which saves the cost of use.

[0037] The thickness of the discharge port 6 on the second rear module 18 is greater than the thickness of the discharge port 6 on the first rear module 4, and the widths are the same, and the distance from the second center block 16 to the corresponding discharge port 6 is greater than the distance from the first center block 2 to the corresponding discharge port 6. Therefore, the taper of the chamber formed inside the second rear module 18 is greater than the taper of the chamber formed inside the first rear module 4. When the GPPS fluid passes through the chamber formed by the second rear module 18, it is easier to flow out from the corresponding discharge port 6. Without changing the feeding equipment, when thicker GPPS sheets are produced, the efficiency of passing through the discharge port 6 is also increased accordingly, that is, the flow efficiency is low when producing thin GPPS sheets, and the flow efficiency is high when producing thick GPPS sheets, which can make the quality of the produced sheets more uniform.

[0038] When producing different types of GPPS, the fluidity of different types of GPPS will be different. When using GPPS materials with better fluidity, the internal space of the chamber needs to be increased, and the GPPS materials are mixed evenly in the chamber to reduce the flow rate, so that they flow out from the discharge port 6 more evenly and slowly to ensure the quality of the GPPS sheet. At this time, the bolts in the fixing holes 9 are removed, and multiple first center blocks 2 of the same size are installed to increase the volume of the internal chamber of the mold body 1;

[0039] When producing GPPS fluid with poor fluidity, the redundant first center block 2 is removed, and the first front module 3 and the first rear module 4 are removed in pairs, such as removing the first front module 3a and the first rear module 4a at the same time, and then installing the first center block 2 of the corresponding replacement size so that the first center block 2 can be located between the first front module 3b and the first rear module 4b, or removing the first front module 3a, the first front module 3b, the first rear module 4a and the first rear module 4b at the same time, and installing the first center block 2 of the corresponding replacement size so that the first center block 2 can be located between the first front module 3c and the first rear module 4c, thereby reducing the volume of the chamber, thereby reducing the resistance of the GPPS fluid, and facilitating the GPPS fluid to flow out through the discharge port 6.

[0040] When the size of the mold body 1 needs to be adjusted, the overall length of the mold body 1 can also be adjusted by increasing or decreasing the number of the first central blocks 2 , or the number of the first front modules 3 and the first rear modules 4 .

[0041] When the fluid passes through the chamber, the pressure sensor 15 can detect the pressure of the fluid in the chamber, so as to determine whether the pressure of the fluid in the chamber meets the production requirements. When the pressure of the fluid in the chamber is too low, the staff can rotate the rotating cap 7 to drive the rotating shaft and the rotating plate 10 to rotate, thereby driving the baffle 11 to rotate, so that the baffle 11 blocks the GPPS fluid flowing through, thereby increasing the resistance to fluid flow, and then reducing the speed of GPPS fluid outflow to a certain extent, thereby increasing the pressure in the chamber and making the GPPS fluid outflow more uniform; when the baffle 11 is not needed to block the fluid, the staff rotates the rotating cap 7 to drive the rotating shaft, the rotating plate 10 and the baffle 11 to rotate, so that the length direction of the baffle 11 is the same as the flow direction of the GPPS fluid, which can play a role in guiding the flow.

[0042] When the fluid flowing through the chamber has a fast flow rate, the rotating cap 7 can also be rotated to drive the rotating shaft, the rotating plate 10 and the baffle 11 to rotate, so that the length direction of the baffle 11 is at a certain angle to the flow direction of the GPPS fluid, thereby playing a role in disturbing the flow, reducing the flow rate of the fluid and mixing it evenly.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An extrusion molding die for a GPPS sheet, comprising a die body (1), characterized in that: The mold body (1) comprises a first central block (2), a first front module (3) and a first rear module (4); there are a plurality of first central blocks (2), first front modules (3) and first rear modules (4); the first front module (3) closest to the first central block (2) is the first front module (3a), followed by the first front module (3b); the first front module (3) farthest from the first central block (2) is provided with a feed port (5); the first rear module (4) closest to the first central block (2) is the first rear module (4a), followed by the first rear module (4b); the first rear module (4) farthest from the first central block (2) is provided with a discharge port (6); all the first central blocks (2), the first front modules (3) and the first rear modules (4) are provided with fixing holes (9), and bolts are provided in the fixing holes (9); A central block inner ring (12) is provided on the inner side of the first central block (2), and a front module inner ring (13) is provided on the inner side of the first front module (3); the cross-sectional area of ​​the front module inner ring (13) gradually increases from a direction away from the first central block (2) to a direction close to the first central block (2); and the cross-sectional area of ​​the rear module inner ring (14) gradually increases from a direction away from the first central block (2) to a direction close to the first central block (2); all the central block inner rings (12), the front module inner rings (13) and the rear module inner rings (14) form a chamber with a conical cross-section; The mold body (1) further comprises a second central block (16), a second front module (17) and a second rear module (18); the second central block (16) and the first central block (2) have the same size, and the fixing holes (9) on the second front module (17) and the second rear module (18) are the same.

2. The extrusion molding die for a GPPS sheet according to claim 1, characterized in that: The same group of mold bodies (1) is provided with a plurality of first center blocks (2), wherein one side of the center block inner ring (12) of some of the first center blocks (2) can cooperate with one side of the first front module (3b), and the other side can cooperate with one side of the first rear module (4b), and one side of the center block inner ring (12) of some of the first center blocks (2) can cooperate with one side of the first front module (3c), and the other side can cooperate with one side of the first rear module (4c).

3. The extrusion molding die of a GPPS sheet according to claim 1, characterized in that: The feed port (5) is fixed to the first front module (3) via fixing bolts, and the discharge port (6) is fixed to the first rear module (4) via fixing bolts.

4. The extrusion molding die for a GPPS sheet according to claim 1, characterized in that: A baffle (11) is provided in the middle of each of the first central block (2) and the second central block (16); the baffle (11) is rotatably mounted in the first central block (2) or the second central block (16).

5. The extrusion molding die for a GPPS sheet according to claim 4, characterized in that: The first center block (2) and the second center block (16) are each provided with a rotating cap (7) at the top, the bottom of the rotating cap (7) being fixedly connected to a rotating shaft, the rotating shaft passing through the top of the first center block (2) or the second center block (16) and being rotatably connected to the first center block (2) or the second center block (16), the bottom of the rotating shaft being fixedly connected to a rotating plate (10), the bottom of the rotating plate (10) being fixedly connected to a baffle (11).

6. The extrusion molding die for GPPS sheet according to claim 5, characterized in that: A pointing rod (8) is provided on the top of the rotating cap (7), and the length direction of the pointing rod (8) is the same as the length direction of the blocking piece (11).

7. The extrusion molding die for a GPPS sheet according to claim 1, characterized in that: Pressure sensors (15) are provided at the inner bottoms of the first central block (2) and the second central block (16).

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