A new adjustable partial vacuum device for a plastic profile forming die

Abstract

The utility model relates to the technical field of plastic profile extrusion forming manufacturing, concretely to a new type of partial vacuum adjustable device of plastic profile setting mould, including upper tool and lower tool, the opposite inner wall of upper tool and lower tool is opened with several air holes respectively, the space after upper tool and lower tool close is setting cavity, the lateral wall of upper tool is opened with adjusting device, adjusting device includes adjusting cavity, the right side of upper tool is opened with adjusting cavity through, the utility model discloses a screw plug rod drives the screwing of adjusting air rod, adjusting air rod drives adjusting plug to push, adjusting plug gradually closes air hole to reach the accurate control of vacuum adsorption force of the area where air hole is, through accurate control local vacuum degree, can effectively balance the profile large face resistance stress, improves the quality problem such as profile bending, shaking, collapsed corner caused by uneven wall thickness, uneven cooling, significantly improves product appearance quality and the qualified rate.

Description

Technical Field

[0001] This utility model relates to the field of plastic profile extrusion molding manufacturing technology, specifically a novel adjustable local vacuum device for plastic profile shaping mold. Background Technology

[0002] Plastic profile extrusion molding technology is a continuous process in which molten preform is extruded through a die by heating and pressurizing an extruder, followed by rapid cooling and solidification through dry setting, wet setting (water tank), and finally, plastic profiles. Facing increasingly fierce market competition, higher requirements are being placed on the surface, appearance, and assembly of PVC windows and doors. Profile bending and localized cross-sectional deformation are common problems encountered during the production process.

[0003] However, the problem with plastic profile extrusion molding technology is that when problems such as profile bending and localized cross-sectional deformation occur during extrusion molding, the machine needs to be stopped and the die cover plate removed to individually cut off the segmented air vents. This disassembly and assembly process is time-consuming and increases production costs. Therefore, we propose a novel adjustable local vacuum device for the die of plastic profile extrusion molding. Utility Model Content

[0004] The purpose of this invention is to solve the problem of long assembly and disassembly time after bending of profiles, and to provide a novel adjustable local vacuum device for shaping molds of plastic profiles.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A novel adjustable vacuum device for shaping plastic profiles includes an upper mold and a lower mold. The inner walls of the upper and lower molds have several air holes. The space between the closed upper and lower molds forms a shaping cavity. An adjustment device is provided on the side wall of the upper mold, including an adjustment cavity. The adjustment cavity extends through the right side of the upper mold. A sealing plug is fixedly installed on the left inner wall of the adjustment cavity, and a screw rod is threadedly connected to the right inner wall of the adjustment cavity. A sliding cavity is provided at the end of the screw rod near the air holes. An adjusting air rod is slidably installed on the inner wall of the sliding cavity. A C-shaped spring is provided between the adjusting air rod and the inner wall of the sliding cavity. Several adjusting plugs are fixedly installed on the outer wall of the adjusting air rod near the air holes.

[0007] Preferably, the end face of the screw rod is provided with multiple position markings. By rotating the screw rod, the adjusting rod can be driven to move axially, thereby realizing multi-level adjustment of the air hole opening.

[0008] Preferably, the position markings of the screw rod include position one, position two, and position three;

[0009] When the screw rod is rotated to position one, the air hole is fully open; when rotated to position two, the air hole is half open; when rotated to position three, the air hole is fully closed.

[0010] Preferably, the C-shaped spring is made of stainless steel, which has good corrosion resistance and elastic recovery characteristics.

[0011] Preferably, the outer surface of the screw rod is provided with anti-slip texture to facilitate manual operation.

[0012] Preferably, a sealing gasket is provided at the interface between the sealing plug and the adjustment chamber to ensure vacuum sealing.

[0013] By employing the above technical solution, this utility model provides a novel adjustable local vacuum device for shaping molds of plastic profiles. Its beneficial effects are as follows: This utility model uses a screw rod to drive the adjustment rod to screw in, which in turn drives the adjustment plug to push the adjustment plug. The adjustment plug gradually closes the air holes, achieving precise control of the vacuum adsorption force in the area where the air holes are located. By precisely controlling the local vacuum level, it can effectively balance the large-area resistance stress of the profile, improving quality problems such as profile bending, shaking, and corner collapse caused by uneven wall thickness and uneven cooling, significantly improving product appearance quality and pass rate. It also fundamentally changes the traditional operating mode that requires machine shutdown, mold disassembly, and manual hole plugging, realizing real-time dynamic adjustment without stopping production, greatly improving production efficiency and reducing production costs and labor intensity. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0015] Figure 1 This is a front view schematic diagram of the overall structure of the molding die;

[0016] Figure 2 This is a top sectional view of the molding die;

[0017] Figure 3 This is a schematic front sectional view of the overall structure of the molding die;

[0018] Figure 4 These are the front view and right view schematic diagram of the sealing screw plug;

[0019] Figure 5 A front view schematic diagram of the adjusting rod and adjusting plug;

[0020] Figure 6 These are the front sectional view and right view schematic diagram of the screw rod;

[0021] Figure 7 This is a front view and a right view of a C-shaped spring.

[0022] In the diagram: 1. Upper mold; 2. Lower mold; 3. Air hole; 4. Shaping cavity; 5. Adjustment device; 51. Adjustment chamber; 52. Sealing plug; 53. Plug rod; 54. Adjusting air rod; 55. C-shaped spring; 56. Adjusting plug. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] A novel adjustable local vacuum device for shaping molds of plastic profiles, such as... Figures 1-7 As shown, the mold includes an upper mold 1 and a lower mold 2. The inner walls of the upper mold 1 and the lower mold 2 are respectively provided with a number of air holes 3. The space after the upper mold 1 and the lower mold 2 are closed is a shaping cavity 4. An adjustment device 5 is provided on the side wall of the upper mold 1. The adjustment device 5 includes an adjustment cavity 51. The adjustment cavity 51 is provided through the right side of the upper mold 1. A sealing screw plug 52 is fixedly installed on the inner wall of the left end of the adjustment cavity 51 of the upper mold 1. A screw plug rod 53 is threadedly connected to the inner wall of the right end of the adjustment cavity 51 of the upper mold 1. A sliding cavity is provided at the end of the screw plug rod 53 near the air hole 3. An adjustment air rod 54 is slidably installed on the inner wall of the sliding cavity of the screw plug rod 53. A C-shaped spring 55 is provided between the adjustment air rod 54 and the inner wall of the sliding cavity of the screw plug rod 53. A number of adjustment plugs 56 are fixedly installed on the outer wall of the adjustment air rod 54 near the air holes 3.

[0026] The end face of the screw rod 53 is marked with multiple positions. By rotating the screw rod 53, the adjusting rod 54 can be driven to move axially, thereby realizing multi-level adjustment of the opening of the air hole 3.

[0027] The gear positions of the screw rod 53 include gear position one, gear position two, and gear position three;

[0028] When the screw rod 53 is rotated to position one, the air hole 3 is fully open; when rotated to position two, the air hole 3 is half open; when rotated to position three, the air hole 3 is fully closed.

[0029] The C-shaped spring 55 is made of stainless steel and has good corrosion resistance and elastic recovery characteristics. The C-shaped spring 55 provides stable restoring force and ensures uniform axial displacement when rotating the screw rod 53. At the same time, its stainless steel material ensures corrosion resistance and long service life under harsh working conditions of high temperature and high humidity.

[0030] The outer surface of the screw rod 53 is provided with anti-slip texture for easy manual operation.

[0031] A sealing gasket is provided at the interface between the sealing plug 52 and the regulating cavity 51 to ensure vacuum sealing. The sealing plug 52 and the sealing gasket at its interface form a sealed end with the right end of the regulating cavity 51, ensuring the sealing of the entire vacuum channel, preventing vacuum leakage, and ensuring the effectiveness of the adjustment.

[0032] In the extrusion production of plastic profiles, the molten preform passes through the shaping cavity 4 formed by the closing of the upper mold 1 and the lower mold 2. After the vacuum system is activated, the external vacuum source adsorbs and cools the surface of the profile through the unblocked air holes 3, causing it to adhere tightly to the mold wall and be shaped.

[0033] When problems such as profile bending, vibration, or corner collapse occur during production, operators can directly operate the adjustment device 5 online without stopping the machine or disassembling the mold. The operator manually rotates the screw rod 53. Because it is threadedly connected to the inner wall of the adjustment cavity 51, the rotational motion is converted into axial linear motion. When the screw rod 53 is screwed inward, it compresses the C-shaped spring 55 in its sliding cavity and pushes the adjusting rod 54 to move to the left, i.e., towards the air hole 3. Several adjusting plugs 56 fixedly installed on the adjusting rod 54 move accordingly, gradually blocking or moving away from the corresponding air hole 3, thereby achieving precise control of the vacuum adsorption force in this area. Through the multi-position adjustment setting, when the screw rod 53 is screwed into position one, the screw rod 53 is at its outermost position. Under the elastic force of the C-shaped spring 55, the adjusting rod 54 returns to its original position, and the adjusting plug 56 completely disengages from the air hole 3, the vacuum channel is fully open, and the adsorption force is at its maximum. When the screw rod 53 is screwed into position two, the screw rod 53 is in the middle position, and the adjusting plug 56 partially covers the air hole 3, forming a half-open state, and the adsorption force is halved. This state is often used for fine adjustment to balance the cooling stress of various parts of the profile. When the screw rod 53 is fully screwed into position three, it pushes the adjusting plug 56 to completely block the air hole 3, completely cutting off the vacuum in this area, and the adsorption force is zero. This state is used to reduce the adsorption force in specific parts of the profile and correct bending or deformation caused by uneven cooling. The screw rod 53 drives the adjusting air rod 54 to screw in, which in turn drives the adjusting plug 56 to gradually close the air hole 3, achieving precise control of the vacuum adsorption force in the area where the air hole 3 is located. By precisely controlling the local vacuum level, the resistance stress on the large surface of the profile can be effectively balanced, improving quality problems such as bending, shaking, and corner collapse caused by uneven wall thickness and uneven cooling. This significantly improves the product's appearance quality and pass rate, and fundamentally changes the traditional operating mode that requires machine shutdown, mold disassembly, and manual hole plugging. It enables real-time dynamic adjustment without stopping production, greatly improving production efficiency and reducing production costs and labor intensity.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel adjustable vacuum device for shaping plastic profiles, comprising an upper mold (1) and a lower mold (2), wherein the inner walls of the upper mold (1) and the lower mold (2) are respectively provided with a plurality of air holes (3), and the space after the upper mold (1) and the lower mold (2) are closed is a shaping cavity (4), characterized in that: The upper mold (1) has an adjustment device (5) on its side wall. The adjustment device (5) includes an adjustment cavity (51). The adjustment cavity (51) is opened through the right side of the upper mold (1). A sealing screw plug (52) is fixedly installed on the inner wall of the left end of the adjustment cavity (51) of the upper mold (1). A screw plug rod (53) is threadedly connected to the inner wall of the right end of the adjustment cavity (51) of the upper mold (1). A sliding cavity is opened at the end of the screw plug rod (53) near the air hole (3). An adjustment air rod (54) is slidably installed on the inner wall of the sliding cavity of the screw plug rod (53). A C-shaped spring (55) is provided between the adjustment air rod (54) and the inner wall of the sliding cavity of the screw plug rod (53). Several adjustment plugs (56) are fixedly installed on the outer wall of several air holes (3) near the adjustment air rod (54).

2. The novel adjustable partial vacuum device for shaping plastic profiles according to claim 1, characterized in that: The end face of the screw rod (53) is provided with multiple gear markings. By rotating the screw rod (53), the adjusting rod (54) can be driven to move axially, thereby realizing multi-level adjustment of the air hole opening.

3. The novel adjustable partial vacuum device for shaping mold of plastic profiles according to claim 2, characterized in that: The gear positions of the screw rod (53) include gear one, gear two and gear three; When the screw rod (53) is rotated to position one, the air hole is fully open; when rotated to position two, the air hole is half open; when rotated to position three, the air hole is fully closed.

4. The novel adjustable partial vacuum device for shaping mold of plastic profiles according to claim 3, characterized in that: The C-shaped spring (55) is made of stainless steel.

5. The novel adjustable partial vacuum device for shaping mold of plastic profiles according to claim 4, characterized in that: The outer surface of the screw rod (53) is provided with anti-slip texture.

6. The novel adjustable partial vacuum device for shaping mold of plastic profiles according to claim 5, characterized in that: A sealing gasket is provided at the interface between the sealing plug (52) and the adjusting cavity (51).

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