Positive and negative pressure plastic suction mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a positive and negative pressure plastic suction mold. According to the technical scheme, the positive and negative pressure plastic suction mold comprises a panel, an upper mold base plate, an upper mold plate, a push plate, a lower mold plate, a lower mold base plate and a bottom plate which are sequentially arranged from top to bottom, a plurality of inserts are arranged on the side, facing the push plate, of the upper mold plate, a plastic sheet is pressed between the push plate and the lower mold plate, and negative pressure is pumped on the upper side of the plastic sheet through the panel. The lower side of the plastic sheet is charged with positive pressure through the bottom plate, and the plastic sheet is tightly attached to the inserts under the simultaneous action of the upper side negative pressure and the lower side positive pressure. The utility model provides the positive and negative pressure plastic suction mold capable of improving the forming effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to a positive and negative pressure thermoforming mold. Background Technique

[0002] Thermoforming is a plastic processing technology. The main principle is to heat and soften a flat plastic sheet, and then use vacuum adsorption on the surface of the mold. After cooling, it is formed. It is widely used in industries such as plastic packaging, lighting, advertising, and decoration.

[0003] The patent with the application number 202010655183.6 discloses a negative pressure door liner thermoforming mold, which relates to the technical field of door liner manufacturing. Aiming at the problems in the traditional negative pressure door liner forming mold that vacuum adsorption cannot be used, reducing the surface quality of the formed product, and the formed product cannot be cooled quickly, the following scheme is proposed. It includes a box body, a vacuum pump is fixedly connected to the bottom of the box body, a vacuum tube is fixedly connected to the top of the vacuum pump, a hollow mold is fixedly connected to the top of the vacuum tube, a lower template is sleeved outside the vacuum tube, a fixing plate fixedly connected to the inner wall of the box body is arranged directly below the lower template, an upper template is arranged directly above the lower template, and two threaded sleeves are fixedly connected to the top of the upper template. This patent can not only make the raw material thermoform quickly, avoid burrs on the surface of the formed product, improve the overall quality, but also realize the rapid cooling of the formed product.

[0004] However, the above-mentioned mold is the same as the traditional thermoforming mold, and only adsorbs materials by negative pressure vacuum pumping, which cannot ensure that the product is completely adsorbed in place and cannot be applied to products with complex structures. Content of the Utility Model

[0005] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a positive and negative pressure thermoforming mold that can improve the forming effect.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A positive and negative pressure thermoforming mold includes a panel, an upper die backing plate, an upper template, a push plate, a lower template, a lower die backing plate, and a bottom plate arranged in sequence from top to bottom. A plurality of inserts are arranged on one side of the upper template facing the push plate. The plastic sheet is pressed between the push plate and the lower template. Negative pressure is pumped on the upper side of the plastic sheet through the panel, and positive pressure is filled on the lower side of the plastic sheet through the bottom plate. Under the simultaneous action of the upper negative pressure and the lower positive pressure, the plastic sheet is tightly attached to a plurality of inserts.

[0008] In this utility model, the panel sucks negative pressure on the upper side of the plastic sheet, and the bottom plate fills positive pressure on the lower side of the plastic sheet. Under the simultaneous action of the upper negative pressure and the lower positive pressure, the plastic sheet is tightly attached to several inserts. Compared with traditional thermoforming molds, this utility model increases the positive pressure, and the product forming effect is better and more in place, and complex products can be formed.

[0009] As a preferred solution of this utility model, an upper air guide block is arranged on the lower side of the panel, and the panel sucks negative pressure through the upper air guide block. The gas on the upper side of the plastic sheet is discharged from the panel through the upper air guide block, realizing the vacuum pumping on the upper side of the plastic sheet.

[0010] As a preferred solution of this utility model, a lower air guide block is arranged on the upper side of the bottom plate, and the bottom plate fills positive pressure through the lower air guide block. External gas is flushed into the lower side of the plastic sheet through the lower air guide block, thereby flushing positive pressure on the lower side of the plastic sheet.

[0011] As a preferred solution of this utility model, several cylinders are installed on the upper die backing plate, and the ejector rods of the cylinders pass through the upper template and are connected to the push plate. During demolding, the ejector rods of the cylinders push the push plate to move downward, and the push plate drives the plastic sheet to move downward, realizing the separation of the plastic sheet from the upper template. When the ejector rods of the cylinders retract, the push plate is driven to reset.

[0012] As a preferred solution of this utility model, the ejector rods of the cylinders and the push plate are connected by positioning pins. The positioning pins reliably connect the push plate and the ejector rods of the cylinders. Ensure that the cylinders can reliably drive the push plate to move.

[0013] As a preferred solution of this utility model, several air holes are arranged on the inserts. Many air holes are arranged on the inserts for vacuum adsorption of the heated and softened plastic sheet.

[0014] As a preferred solution of this utility model, several vacuum channels are arranged on the upper die backing plate. When vacuum pumping is performed on the upper side of the plastic sheet, the gas passes through the upper die backing plate from the vacuum channels.

[0015] As a preferred solution of this utility model, several air inflation channels are arranged on the lower die backing plate. When positive pressure is filled on the lower side of the plastic sheet, the gas passes through the lower die backing plate from the air inflation channels.

[0016] As a preferred solution of this utility model, several through holes corresponding to the inserts are arranged on the push plate, and the inserts extend into the through holes. This can avoid the push plate blocking the adsorption of the plastic sheet to the inserts.

[0017] As a preferred solution of this utility model, several lower die slots corresponding to the inserts are arranged on the lower template.

[0018] The beneficial effects of this utility model are as follows:

[0019] The panel of the present utility model sucks negative pressure on the upper side of the plastic sheet, and fills positive pressure on the lower side of the plastic sheet through the bottom plate. Under the simultaneous action of the upper negative pressure and the lower positive pressure, the plastic sheet is tightly attached to a number of inserts. Compared with the traditional thermoforming mold, the present utility model increases the positive pressure, and the product forming effect is better and more in place, and complex products can be formed. Brief Description of the Drawings

[0020] Figure 1 is the structural schematic diagram of the present utility model;

[0021] Figure 2 is the exploded view of the present utility model in the first direction;

[0022] Figure 3 is the exploded view of the present utility model in the second direction;

[0023] Figure 4 is the structural schematic diagram of the panel;

[0024] Figure 5 is the structural schematic diagram of the upper die backing plate;

[0025] Figure 6 is the structural schematic diagram of the upper template in the first direction;

[0026] Figure 7 is the structural schematic diagram of the upper template in the second direction;

[0027] Figure 8 is the structural schematic diagram of the ejector plate;

[0028] Figure 9 is the structural schematic diagram of the lower template;

[0029] Figure 10 is the structural schematic diagram of the lower die backing plate;

[0030] Figure 11 is the structural schematic diagram of the bottom plate;

[0031] Figure 12 is the front view of the present utility model;

[0032] Figure 13 is Figure 12 the sectional view taken along line A-A in

[0033] Figure 14 is Figure 12 the sectional view taken along line B-B in

[0034] Figure 15 is the structural schematic diagram of the present utility model before adsorption;

[0035] Figure 16 is the structural schematic diagram of the present utility model during demolding;

[0036] Figure 17 This is a schematic structural view of the present utility model after demolding.

[0037] In the figure: 1 - panel; 2 - upper die backing plate; 3 - upper template; 4 - ejector plate; 5 - lower template; 6 - lower die backing plate; 7 - bottom plate; 8 - cylinder; 11 - upper air guide block; 21 - vacuum channel; 31 - insert; 41 - through hole; 51 - lower die cavity; 61 - inflation channel; 71 - lower air guide block; 81 - ejector rod; 82 - positioning pin; 311 - air hole; 511 - screw hole. Specific embodiments

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0040] As Figures 1 to 10 shown, the positive and negative pressure thermoforming mold of this embodiment includes a panel 1, an upper die backing plate 2, an upper template 3, an ejector plate 4, a lower template 5, a lower die backing plate 6, and a bottom plate 7 arranged in sequence from top to bottom. A plurality of inserts 31 are provided on one side of the upper template 3 facing the ejector plate 4. The plastic sheet is pressed between the ejector plate 4 and the lower template 5. Negative pressure is drawn on the upper side of the plastic sheet through the panel 1, and positive pressure is filled on the lower side of the plastic sheet through the bottom plate 7. Under the simultaneous action of the upper negative pressure and the lower positive pressure, the plastic sheet is tightly attached to the plurality of inserts 31.

[0041] The present utility model draws negative pressure on the upper side of the plastic sheet through the panel 1, and fills positive pressure on the lower side of the plastic sheet through the bottom plate 7. Under the simultaneous action of the upper negative pressure and the lower positive pressure, the plastic sheet is tightly attached to the plurality of inserts 31. Compared with the traditional thermoforming mold, the present utility model increases the positive pressure, and the product forming effect is better and more in place, and complex products can be formed.

[0042] Among them, an upper air guide block 11 is provided on the lower side of the panel 1, and the panel 1 draws negative pressure through the upper air guide block 11. The gas on the upper side of the plastic sheet is discharged from the panel 1 through the upper air guide block 11, realizing vacuum pumping on the upper side of the plastic sheet.

[0043] On the upper side of the bottom plate 7, a lower air guide block 71 is provided. The bottom plate 7 is filled with positive pressure through the lower air guide block 71. External gas is forced into the lower side of the plastic sheet through the lower air guide block 71, thereby applying positive pressure to the lower side of the plastic sheet.

[0044] For convenient demolding, a number of cylinders 8 are installed on the upper die backing plate 2. The ejector rod 81 of the cylinder 8 passes through the upper template 3 and is connected to the push plate 4. During demolding, the ejector rod 81 of the cylinder 8 pushes the push plate 4 downward, and the push plate 4 drives the plastic sheet downward to separate the plastic sheet from the upper template 3. When the ejector rod 81 of the cylinder 8 retracts, it drives the push plate 4 to reset.

[0045] The ejector rod 81 of the cylinder 8 is connected to the push plate 4 through a positioning pin 82. The positioning pin 82 reliably connects the push plate 4 and the ejector rod 81 of the cylinder 8, ensuring that the cylinder 8 can reliably drive the push plate to move.

[0046] To ensure reliable adsorption of the plastic sheet, a number of air holes 311 are provided on the insert 31. A large number of air holes 311 are provided on the insert 31 for vacuum adsorption of the heated and softened plastic sheet.

[0047] A number of vacuum channels 21 are provided on the upper die backing plate 2. When evacuating the upper side of the plastic sheet, the gas passes through the upper die backing plate 2 from the vacuum channels 21.

[0048] A number of inflation channels 61 are provided on the lower die backing plate 6. When applying positive pressure to the lower side of the plastic sheet, the gas passes through the lower die backing plate 6 through the inflation channels 61.

[0049] A number of through holes 41 corresponding to the insert 31 are provided on the push plate 4, and the insert 31 extends into the through holes 41, which can prevent the push plate 4 from blocking the adsorption of the plastic sheet to the insert 31.

[0050] A number of lower die grooves 51 corresponding to the insert 31 are provided on the lower template 5. A product forming block is provided in the lower die groove 51, and screw holes 511 for fixing the product forming block are provided in the lower die groove 51.

[0051] The present utility model is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they all fall within the protection scope of the present utility model.

Claims

1. A positive and negative pressure blister mold, characterized in that: The invention comprises a panel (1), an upper die pad (2), an upper die plate (3), a push plate (4), a lower die plate (5), a lower die pad (6) and a bottom plate (7) which are arranged in sequence from top to bottom. A plurality of inserts (31) are arranged on the side of the upper die plate (3) facing the push plate (4). The plastic sheet is pressed tightly between the push plate (4) and the lower die plate (5). Negative pressure is drawn on the upper side of the plastic sheet through the panel (1), and positive pressure is charged on the lower side of the plastic sheet through the bottom plate (7). Under the simultaneous action of the negative pressure on the upper side and the positive pressure on the lower side, the plastic sheet is pressed tightly against the plurality of inserts (31).

2. A positive and negative pressure blister mold according to claim 1, characterized in that: An upper air guide block (11) is provided on the lower side of the panel (1), and negative pressure is drawn from the panel (1) through the upper air guide block (11).

3. A positive and negative pressure blister mold according to claim 1, characterized in that: A lower air guide block (71) is provided on the upper side of the bottom plate (7), and the bottom plate (7) is filled with positive pressure through the lower air guide block (71).

4. A positive and negative pressure blister mold according to claim 1, characterized in that: A plurality of cylinders (8) are installed on the upper die pad (2), and the push rods (81) of the cylinders (8) pass through the upper die plate (3) and are connected to the push plate (4).

5. A positive and negative pressure blister mold according to claim 4, characterized in that: The push rod (81) of the cylinder (8) is connected to the push plate (4) via a positioning pin (82).

6. The positive and negative pressure blister mold according to claim 1, characterized in that: The insert (31) is provided with a plurality of air holes (311).

7. The positive and negative pressure blister mold according to claim 1, characterized in that: The upper die pad (2) is provided with a plurality of vacuum channels (21).

8. The positive and negative pressure blister mold according to claim 1, characterized in that: The lower die pad (6) is provided with a plurality of inflation channels (61).

9. The positive and negative pressure blister mold according to claim 1, characterized in that: The push plate (4) is provided with a plurality of through holes (41) corresponding to the inserts (31), and the inserts (31) extend into the through holes (41).

10. The positive and negative pressure blister mold according to claim 1, characterized in that: The lower mold plate (5) is provided with a plurality of lower mold grooves (51) corresponding to the inserts (31).

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