Plastic plate extrusion forming die

Abstract

The utility model discloses a plastic plate extrusion forming die which comprises a flow dividing mechanism, an upper die block and a lower die block, the upper die block is arranged above the lower die block, the outer end of the joint is sealed, and a forming cavity for extruding a plastic plate is formed in the joint surface of the upper die block and the lower die block; the flow dividing mechanism comprises flow dividing pipes and feeding branch pipes, the two flow dividing pipes are communicated with a discharging opening of the plastic extruding machine through a tee joint, and the multiple feeding branch pipes are evenly and symmetrically communicated with the flow dividing pipes; a plurality of feeding holes are uniformly formed in the back side surfaces of the upper module and the lower module; and the feeding holes and the feeding branch pipes are correspondingly arranged and are communicated with each other. According to the utility model, the shunting mechanism is arranged, and the shunting pipe and the feeding branch pipe of the shunting mechanism can be used for shunting the plastic fluid in a molten state output by the outlet of the extruder, and the plastic fluid is conveyed into the molding cavity in a multi-point manner through the plurality of feeding holes uniformly formed in the mold. The thickness uniformity of extruded plates can be improved, and the production quality of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic plate processing, in particular to a plastic plate extrusion molding die. Background Art

[0002] Plastic sheet is a sheet made of plastic as raw material. In the process of plastic sheet processing, the extrusion molding die plays a vital role and determines the quality of the final product. The extrusion molding die is usually used in conjunction with a plastic extruder. The plastic is heated and melted by the extruder and the screw is rotated to transport the molten plastic to the molding die for preliminary molding, and then immediately enters the three-roll calender, which calenders it, cools it and shapes it, and then flattens, pulls it, and cuts it to obtain the finished plastic sheet.

[0003] In the existing plastic sheet extrusion molding die, the discharge port of the plastic extruder and the feed port of the molding die are usually connected at a single point through a pipeline, and the feed port of the molding die is set in the middle position. When the plastic enters the mold, it needs to diffuse from the middle to both ends in the molding cavity, resulting in the plastic flow rate and pressure in the middle of the molding cavity being often greater than those at both ends, which easily leads to the problem that the extruded sheet is thick in the middle and thin at both ends, affecting the quality of the product. For example, the utility model patent with application number 202121046108.6 discloses a plastic sheet extrusion molding die, including a mold body, the mold body is provided with a hanger-type flow channel, the hanger-type flow channel is connected to the feed port, the mold body is provided with a mold cavity, the mold cavity is connected to one end of the hanger-type flow channel away from the feed port, a plurality of pressing blocks are slidably connected to the mold body, a support is fixedly connected to the mold body, a pressing plate is slidably connected to the support in the vertical direction, and an adjustment mechanism for driving the pressing plate to slide toward the pressing block is provided on the support.

[0004] In the technical solution of the above patent, although the deformation of the mold body caused by high temperature can be compensated by the adjustment mechanism, thereby improving the thickness uniformity of the extruded sheet, the plastic enters the mold cavity through the feed port, and the plastic flow rate and pressure at the two ends and the middle of the mold cavity are still different, which still leads to uneven thickness of the extruded sheet.

[0005] Therefore, it is necessary to develop a plastic sheet extrusion molding die for the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide a plastic plate forming die, which can improve the thickness uniformity of the extruded plate and improve the production quality of the product.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model discloses a plastic sheet extrusion molding die, comprising a diversion mechanism, an upper module and a lower module, wherein the upper module is arranged above the lower module and the outer end of the joint is sealed, and a molding cavity for extruding the plastic sheet is provided at the joint surface of the upper module and the lower module; the diversion mechanism comprises a diversion pipe and a feed branch pipe, two of the diversion pipes are connected with the discharge port of an extruder through a tee, and a plurality of the feed branch pipes are evenly and symmetrically connected to the diversion pipe; a plurality of feed ports are evenly provided on the back sides of the upper module and the lower module, and the feed ports and the feed branch pipes are correspondingly arranged and connected with each other.

[0009] Furthermore, it also includes a heating box, on the inner wall of which a heating plate is fixedly mounted, and the diversion pipe and the feed branch pipe are located in the middle of the inner cavity of the heating box.

[0010] Furthermore, the inner end of the feed port is connected to the molding cavity through a branch channel, and the two branch channels are formed in a herringbone shape at the inner end of the feed port.

[0011] Furthermore, a groove is transversely opened above the die lip of the upper module, and the depth direction of the groove is toward the bottom surface of the upper module; a boss is arranged above the groove, and a plurality of first threaded holes are evenly opened on the top surface of the boss, the first threaded holes are connected with the groove, and an adjusting bolt is threadedly connected to the first threaded hole, and the bottom end of the adjusting bolt contacts the bottom surface of the groove.

[0012] Furthermore, a mounting groove is transversely opened on the bottom surface of the upper module, and a throttling strip is arranged in the mounting groove; a plurality of second threaded holes connected to the mounting groove are evenly opened on the top surface of the upper module, and a throttling rod is threadedly connected to the second threaded hole, and the throttling rod contacts the top surface of the throttling strip.

[0013] Furthermore, heating holes are provided at both ends of the lower module, and the heating holes are located directly below the mounting groove.

[0014] Furthermore, cooling holes are provided at both ends of the upper module and the lower module.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The utility model provides a flow diversion mechanism, and the flow diversion pipe and the feed branch pipe of the flow diversion mechanism can divert the plastic fluid in a molten state outputted from the outlet of the extruder, and transport the plastic fluid to the molding cavity at multiple points through multiple feed ports evenly opened on the mold, so that the plastic fluid is evenly dispersed to the left and right ends and the middle position when entering the molding cavity, so that the flow velocity and pressure at various places in the molding cavity are the same, so that the plastic fluid can be more evenly spread in the molding cavity, the uniformity of the thickness of the extruded plate is improved, and the production quality of the product is improved.

[0017] At the same time, by setting the diversion channel, the plastic fluid entering the molding cavity can be further diverted, so that the plastic fluid entering the molding cavity is dispersed more evenly, which is more conducive to the plastic fluid being spread flat in the molding cavity.

[0018] In addition, by setting the throttle rod and the throttle strip, the pressure of the plastic fluid at each position in the molding cavity can be adjusted to make the thickness of the extruded plastic sheet more uniform. The distance between the die lip of the upper module and the die lip of the lower module can be adjusted by adjusting the bolt, thereby adjusting the thickness of the extruded plastic sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a top sectional view of the plastic sheet forming mold of the utility model;

[0021] Figure 2 It is a side sectional view of the plastic sheet forming mold of the utility model;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the upper template and the lower template of the utility model;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the upper template and the lower template of the utility model from another perspective.

[0024] Explanation of the accompanying drawings: 1. diverter mechanism; 101. diverter pipe; 102. feed branch pipe; 103. diverter channel; 2. upper module; 3. lower module; 4. molding cavity; 5. feed port; 6. heating box; 7. heating plate; 8. groove; 9. boss; 10. first threaded hole; 11. adjusting bolt; 12. mounting groove; 13. throttle strip; 14. second threaded hole; 15. throttle rod; 16. cooling hole; 17. heating hole; 18. first sealing plate; 19. second sealing plate. DETAILED DESCRIPTION

[0025] The core of the utility model is to provide a plastic plate forming die, which can improve the thickness uniformity of the extruded plate and improve the production quality of the product.

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] With reference to the accompanying drawings, Figure 1 It is a top sectional view of the plastic sheet forming mold of the utility model; Figure 2 It is a side sectional view of the plastic sheet forming mold of the utility model; Figure 3 It is a three-dimensional structural schematic diagram of the upper template and the lower template of the utility model; Figure 4 It is a three-dimensional structural schematic diagram of the upper template and the lower template of the utility model from another perspective.

[0029] In a specific embodiment, Figure 1 As shown, it includes a diverter mechanism 1, an upper module 2 and a lower module 3. The upper module 2 is arranged above the lower module 3 and the outer end of the joint is sealed. A molding cavity 4 for extruding a plastic sheet is opened at the joint surface of the upper module 2 and the lower module 3; the diverter mechanism 1 includes a diverter pipe 101 and a feed branch pipe 102. The two diverter pipes 101 are connected to the discharge port of the extruder through a tee, and multiple feed branch pipes 102 are evenly and symmetrically connected to the diverter pipe 101; multiple feed ports 5 are evenly opened on the back sides of the upper module 2 and the lower module 3, and the feed ports 5 and the feed branch pipes 102 are correspondingly arranged and connected with each other.

[0030] It should be noted that the number of feed branch pipes 102 is at least four, each branch pipe 101 is connected to two feed branch pipes 102, and the spacing between each feed branch pipe 102 is the same. The two ends of the junction of the upper module 2 and the lower module 3 are fixedly sealed by the first sealing plate 18, and the feed end is fixedly sealed by the second sealing plate 19.

[0031] By setting up the diversion mechanism 1, the first diversion tube 101 and the feed branch pipe 102 of the diversion mechanism 1 can divert the plastic fluid in a molten state output from the extruder outlet, and transport the plastic fluid to the molding cavity 4 at multiple points through multiple feed ports 5 evenly opened on the mold, so that the plastic fluid is evenly dispersed to the left and right ends and the middle position when entering the molding cavity 4, so that the plastic fluid can be more evenly spread in the molding cavity 4, thereby improving the uniformity of the thickness of the extruded sheet, thereby improving the product production quality.

[0032] In a specific embodiment, Figure 1As shown, it also includes a heating box 6, on the inner wall of which a heating plate 7 is fixedly mounted, and a shunt pipe 101 and a feed branch pipe 102 are located in the middle of the inner cavity of the heating box 6.

[0033] By providing the heating box 6, the plastic fluid in the branch pipe 101 and the feed branch pipe 102 can be heated by the heating plate 7 to prevent the plastic fluid from condensing in the pipe and affecting the transportation of the plastic fluid.

[0034] In a specific embodiment, Figure 1 As shown, the inner end of the feed port 5 is connected to the molding cavity 4 through a branch channel 103 , and two branch channels 103 are formed in a herringbone shape at the inner end of the feed port 5 .

[0035] By such arrangement, the plastic fluid entering the molding cavity 4 can be further diverted in the mold, so that the plastic fluid entering the molding cavity 4 is dispersed more evenly, which is more conducive to the plastic fluid being spread flat in the molding cavity.

[0036] In a specific embodiment, Figures 2 to 4 As shown, a groove 8 is horizontally opened above the die lip of the upper module 2, and the depth direction of the groove 8 is toward the bottom surface of the upper module 2; a boss 9 is arranged above the groove 8, and a plurality of first threaded holes 10 are evenly opened on the top surface of the boss 9, and the first threaded holes 10 are connected with the groove 8, and an adjusting bolt 11 is threadedly connected to the first threaded hole 10, and the bottom end of the adjusting bolt 11 contacts the bottom surface of the groove 8.

[0037] By rotating the adjusting bolt 11, the pressure of the bottom of the adjusting bolt 11 on the die lip of the upper module 2 is increased, so that the die lip of the upper module is pressed down, thereby changing the distance between the upper module 2 and the lower module 3, thereby adjusting the thickness of the extruded sheet.

[0038] In a specific embodiment, Figures 2 to 4 As shown, a mounting groove 12 is transversely opened on the bottom surface of the upper module 2, and a throttling strip 13 is arranged in the mounting groove 12; a plurality of second threaded holes 14 connected to the mounting groove 12 are evenly opened on the top surface of the upper module 2, and a throttling rod 15 is threadedly connected to the second threaded hole 14, and the throttling rod 15 contacts the top surface of the throttling strip 13.

[0039] By setting the throttle rod 15 and the throttle strip 13 and adjusting the position of the local throttle strip 13 through the throttle rod 15, the pressure and rate of the plastic fluid at each position in the molding cavity can be adjusted to make the thickness of the extruded plastic sheet more uniform.

[0040] Specifically, heating holes 17 are formed at both ends of the lower module 3 , and the heating holes 17 are located directly below the mounting groove 12 .

[0041] By providing the heating hole 17 with a built-in heating element, the plastic fluid at the mounting groove 12 is heated to prevent condensation.

[0042] In a specific embodiment, Figure 3 and Figure 4 As shown, cooling holes 16 are provided at both ends of the upper module 2 and the lower module 3 .

[0043] By providing the cooling hole 16 with a built-in cooling element in the cooling hole 16, the upper module 2 and the lower module 3 are cooled to avoid excessively high mold temperature that affects normal use.

[0044] The working principle of the utility model is as follows: when in use, the discharge port of the extruder is connected to the two branch pipes 101 through a three-way valve, and then the feed branch pipe 102 is connected to the branch pipe 101, and then the other end of the feed branch pipe 102 is connected to the feed port 5 of the mold, and the plastic fluid is transported to the molding cavity 4 at multiple points, so that the plastic fluid is evenly dispersed to the left and right ends and the middle position when entering the molding cavity 4, so that the plastic fluid can be more evenly spread in the molding cavity 4, thereby improving the uniformity of the thickness of the extruded sheet.

[0045] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0046] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A plastic sheet extrusion molding die, characterized in that: The invention comprises a flow diversion mechanism (1), an upper module (2) and a lower module (3), wherein the upper module (2) is arranged above the lower module (3) and the outer end of the joint is sealed, and a molding cavity (4) for extruding a plastic sheet is provided at the joint surface between the upper module (2) and the lower module (3); the flow diversion mechanism (1) comprises a flow diversion pipe (101) and a feed branch pipe (102), two of the flow diversion pipes (101) are connected to the discharge port of an extruder through a tee, and a plurality of the feed branch pipes (102) are evenly and symmetrically connected to the flow diversion pipe (101); a plurality of feed ports (5) are evenly provided on the back side surfaces of the upper module (2) and the lower module (3), and the feed ports (5) and the feed branch pipes (102) are correspondingly arranged and connected to each other.

2. The plastic sheet extrusion molding die according to claim 1, characterized in that: It also comprises a heating box (6), a heating plate (7) being fixedly mounted on the inner wall of the heating box (6), and the diverter pipe (101) and the feed branch pipe (102) being located in the middle of the inner cavity of the heating box (6).

3. The plastic sheet extrusion molding die according to claim 1, characterized in that: The inner end of the feed port (5) is connected to the molding cavity (4) via a branch channel (103), and the two branch channels (103) are formed in a herringbone shape at the inner end of the feed port (5).

4. The plastic sheet extrusion molding die according to claim 1, characterized in that: A groove (8) is transversely provided above the die lip of the upper module (2), and the depth direction of the groove (8) is toward the bottom surface of the upper module (2); a boss (9) is provided above the groove (8), and a plurality of first threaded holes (10) are evenly provided on the top surface of the boss (9), and the first threaded holes (10) are connected to the groove (8), and an adjusting bolt (11) is threadedly connected to the first threaded hole (10), and the bottom end of the adjusting bolt (11) contacts the bottom surface of the groove (8).

5. The plastic sheet extrusion molding die according to claim 1, characterized in that: The bottom surface of the upper module (2) is laterally provided with a mounting groove (12), and a throttling strip (13) is arranged in the mounting groove (12); a plurality of second threaded holes (14) connected to the mounting groove (12) are evenly provided on the top surface of the upper module (2), and a throttling rod (15) is threadedly connected to the second threaded hole (14), and the throttling rod (15) contacts the top surface of the throttling strip (13).

6. The plastic sheet extrusion molding die according to claim 5, characterized in that: Heating holes (17) are provided at both ends of the lower module (3), and the heating holes (17) are located directly below the mounting groove (12).

7. The plastic sheet extrusion molding die according to claim 1, characterized in that: Cooling holes (16) are provided at both ends of the upper module (2) and the lower module (3).

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