Injection mold convenient to eject

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold convenient to eject, which comprises an upper mold and a lower mold, an injection port is fixedly connected to the horizontal center of the upper end face of the upper mold, and the injection port penetrates through the upper end of the upper mold; limiting columns are fixedly connected to the left end of the upper end face of the lower mold and are symmetrically arranged about the horizontal center of the lower mold. The horizontal center of the lower mold is filled with supporting columns, and the supporting columns are symmetrically arranged relative to the lower mold. An equipment cavity is formed in the left end of the upper end face of the lower mold. Through the cooperative use of the inflation bin and the continuously variable transmission, the inflation pressure can be accurately controlled, and it is ensured that film products are stable when being produced; and through the arrangement of the first one-way valve and the second one-way valve, the one-way performance of the inflation process can be ensured, and gas backflow is avoided, so that the inflation efficiency is improved, the service life of the mold is prolonged, and the production efficiency and the product quality are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold that is convenient for ejection. Background Art

[0002] An injection mold is a tool used for plastic molding. It consists of two or more parts that can inject molten plastic into its interior and cool and solidify it into a part of a predetermined shape. However, existing injection molds still have certain defects, such as:

[0003] "A kind of injection mold suitable for slender thin-walled parts" with application number CN202020812665.3 includes a fixed mold and a movable mold, and the fixed mold and the movable mold are combined into an integral injection mold structure, which includes a gate, a cavity and a guide hole in sequence; during the injection molding process, the cavity of the mold is closed, and when the plastic melt is injected and cooled and solidified, the air in the cavity is compressed; a vacuum is formed during ejection; when the ejector block (or a mechanism with similar function) starts to eject the product, the air between the product and the mold cavity is extracted. If there is not enough channel for external air to enter, a partial vacuum state will be formed between the product and the cavity. The formed vacuum will cause a pressure difference between the inside and outside of the product; the external atmospheric pressure acts on the outer surface of the product, while the internal pressure is lower due to the vacuum. This pressure difference can easily cause the product to rupture; for thin-walled or complex-structured products, the vacuum effect in the local area during ejection will cause stress concentration, thereby causing rupture, which cannot meet the use requirements. In view of this, an injection mold that is easy to eject is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the present invention is to provide an injection mold that is easy to eject, so as to solve the problem mentioned in the background art that when ejecting thin-walled or complex-structured products, the existing injection mold will cause stress concentration due to the vacuum effect in the local area, thereby causing cracks.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: it includes an upper mold and a lower mold, and is characterized in that: an injection port is fixedly connected to the horizontal center of the upper end surface of the upper mold, and the injection port passes through the upper end of the upper mold; a limiting column is fixedly connected to the left end of the upper end surface of the lower mold, and the limiting column is symmetrically arranged about the horizontal center of the lower mold; the horizontal center of the lower mold is filled with a support column, and the support column is symmetrically arranged about the lower mold.

[0006] The above technical solution is adopted to ensure the stability of the overall structure.

[0007] As a preferred technical solution of the present invention, an equipment cavity is provided at the left end of the upper end surface of the lower mold, and the equipment cavity is symmetrically arranged about the horizontal center of the lower mold.

[0008] The above technical solution is adopted to facilitate ensuring the complete functionality of the device.

[0009] As a preferred technical solution of the present invention, an electric top block is movably connected in the equipment cavity.

[0010] Adopting the technical solution makes it easy to produce.

[0011] As an optimal technical solution of the present invention, the right end face of the lower mold is fixedly connected to the air filling chamber, and the right end of the inner top surface of the air filling chamber is fixedly connected to the motor, and the left shaft end of the motor is fixedly connected to the continuously variable transmission; the lower end face of the continuously variable transmission and the inner bottom surface of the air filling chamber are fixedly connected; the left output end of the continuously variable transmission is fixedly connected to a reciprocating threaded rod, and the left end of the reciprocating threaded rod is connected to the bearing of the left inner end face of the air filling chamber.

[0012] The above technical solution is adopted to prevent the formation of a partial vacuum state between the product and the cavity, which causes a pressure difference between the inside and outside of the product and easily leads to the rupture of the product.

[0013] As a preferred technical solution of the present invention, a piston plate is threadedly connected to the reciprocating threaded rod, and the lower end surface of the piston plate is slidably connected to the bottom surface of the inflation chamber.

[0014] The above technical solution is adopted to ensure the stability of the air pressure in the inflation chamber; through the adjustment of the continuously variable transmission, the reciprocating speed of the reciprocating threaded rod can be controlled, and then the movement speed of the piston plate can be controlled, so that the product is evenly stressed during the ejection process, avoiding deformation or rupture of the product.

[0015] As an optimal technical solution of the present invention, a No. 1 one-way valve is fixedly connected to the left end of the upper end surface of the air storage tank, and the No. 1 one-way valve passes through the upper end surface of the air storage tank; a No. 2 one-way valve is fixedly connected to the lower end of the left end surface of the air storage tank, and the No. 2 one-way valve passes through the left end surface of the air storage tank.

[0016] The above technical solution is adopted to ensure that the gas in the inflation chamber flows in one direction during the inflation process, prevent gas backflow, and thus improve the inflation efficiency.

[0017] As an optimal technical solution of the present invention, an air intake pipe is buried inside the right end of the lower mold, and the upper end surface of the air intake pipe is slidably connected to an air intake valve; the upper end surface of the air intake valve is fixedly connected to the lower end surface of the electric ejector block.

[0018] Compared with the existing technology, the beneficial effects of the present invention are: the device can effectively prevent the deformation or damage of film products caused by vacuum during the injection molding process; by setting up the inflation chamber and the coordinated use of the continuously variable transmission, the inflation pressure can be accurately controlled to ensure the stability of the film products when they are produced; and through the setting of the No. 1 one-way valve and the No. 2 one-way valve, the unidirectionality of the inflation process can be ensured to avoid gas backflow, thereby improving the inflation efficiency and the service life of the mold, and further improving production efficiency and product quality.

[0019] 1. When in use, the upper mold and the lower mold are attached together through the limiting pillars, and then injection molding is performed through the injection port 9;

[0020] 2. After the product is prepared, start the electric ejector block. During the lifting process, the electric ejector block drives the air intake valve to move upward. At this time, start the motor, which drives the reciprocating threaded rod to rotate through the continuously variable transmission. The reciprocating threaded rod drives the piston plate to move back and forth in the inflation chamber, and inputs the outside air into the gap between the upper mold and the lower mold through the air intake pipe to prevent the vacuum from causing a pressure difference between the inside and outside of the product; the external atmospheric pressure acts on the outer surface of the product, while the internal pressure is lower due to the vacuum. This pressure difference can easily cause the product to rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main cross-sectional structure of the upper mold and the lower mold of the utility model when the mold is closed;

[0022] Figure 2 For this utility model Figure 1 A in the middle is an enlarged structural diagram;

[0023] Figure 3 This is a schematic diagram of the main cross-sectional structure of the inflatable warehouse of the utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure between the motor and the continuously variable transmission of the utility model;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the utility model.

[0026] In the figure: 1. Check valve No. 2; 2. Electric ejector block; 3. Inlet valve; 4. Inlet pipe; 5. Upper mold; 6. Lower mold; 7. Limit column; 8. Support column; 9. Injection port; 10. Inflating chamber; 11. Motor; 12. Continuously variable transmission; 13. Check valve No. 1; 14. Piston plate; 15. Reciprocating threaded rod; 16. Equipment cavity. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-5 The technical solution of the utility model is: an injection mold that is convenient for ejection, including an upper mold 5 and a lower mold 6, characterized in that: an injection port 9 is fixedly connected to the horizontal center of the upper end surface of the upper mold 5, and the injection port 9 passes through the upper end of the upper mold 5; a limiting column 7 is fixedly connected to the left end of the upper end surface of the lower mold 6, and the limiting column 7 is symmetrically arranged about the horizontal center of the lower mold 6; a support column 8 is filled at the horizontal center of the lower mold 6, and the support column 8 is symmetrically arranged about the lower mold 6, so as to ensure the stability of the overall structure;

[0029] The left end of the upper end surface of the lower mold 6 is provided with an equipment cavity 16, and the equipment cavity 16 is symmetrically arranged about the horizontal center of the lower mold 6 to ensure the complete function of the device;

[0030] An electric ejector block 2 is movably connected to the equipment cavity 16 to facilitate product delivery;

[0031] The right end face of the lower mold 6 is fixedly connected to the air filling chamber 10, and the right end of the inner top surface of the air filling chamber 10 is fixedly connected to the motor 11, and the left shaft end of the motor 11 is fixedly connected to the continuously variable transmission 12; the lower end face of the continuously variable transmission 12 is fixedly connected to the inner bottom surface of the air filling chamber 10; the left output end of the continuously variable transmission 12 is fixedly connected to the reciprocating threaded rod 15, and the left end of the reciprocating threaded rod 15 is connected to the bearing of the left inner end face of the air filling chamber 10, so as to prevent the formation of a partial vacuum state between the product and the cavity, resulting in a pressure difference between the inside and outside of the product, which may easily cause the product to rupture;

[0032] The reciprocating threaded rod 15 is threadedly connected to the piston plate 14, and the lower end surface of the piston plate 14 is slidably connected to the bottom surface of the air filling chamber 10, so as to ensure the stability of the air pressure in the air filling chamber 10. The reciprocating speed of the reciprocating threaded rod 15 can be controlled by adjusting the continuously variable transmission 12, thereby controlling the movement speed of the piston plate 14, so that the product is evenly stressed during the ejection process, thereby preventing deformation or rupture of the product.

[0033] The left end of the upper end surface of the inflatable bin 10 is fixedly connected to a No. 1 one-way valve 13, and the No. 1 one-way valve 13 passes through the upper end surface of the inflatable bin 10; the lower end of the left end surface of the inflatable bin 10 is fixedly connected to a No. 2 one-way valve 1, and the No. 2 one-way valve 1 passes through the left end surface of the inflatable bin 10, so as to ensure that the gas flows in one direction during the inflation process, thereby preventing the gas from flowing back, thereby improving the inflation efficiency;

[0034] An air intake pipe 4 is embedded inside the right end of the lower mold 6, and an air intake valve 3 is slidably connected to the upper end surface of the air intake pipe 4; the upper end surface of the air intake valve 3 is fixedly connected to the lower end surface of the electric ejector block 2;

[0035] Working principle: When in use, the upper mold 5 and the lower mold 6 are attached together through the limit column 7, and then injection molding is performed through the injection port 9;

[0036] After the product is prepared, the electric top block 2 is started. The electric top block 2 drives the air intake valve 3 to move upward during the lifting process. At this time, the motor 11 is started. The motor 11 drives the reciprocating threaded rod 15 to rotate through the continuously variable transmission 12. The reciprocating threaded rod 15 drives the piston plate 14 to move back and forth in the inflation chamber 10, and the outside air is input into the gap between the upper mold 5 and the lower mold 6 through the air intake pipe 4 to prevent the vacuum formed from causing a pressure difference between the inside and outside of the product; the external atmospheric pressure acts on the outer surface of the product, while the internal pressure is lower due to the vacuum, and this pressure difference can easily cause the product to rupture.

[0037] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold for easy ejection, comprising an upper mold (5) and a lower mold (6), characterized in that: An injection port (9) is fixedly connected to the horizontal center of the upper end surface of the upper mold (5), and the injection port (9) passes through the upper end of the upper mold (5); a limiting column (7) is fixedly connected to the left end of the upper end surface of the lower mold (6), and the limiting column (7) is symmetrically arranged with respect to the horizontal center of the lower mold (6); a support column (8) is filled at the horizontal center of the lower mold (6), and the support column (8) is symmetrically arranged with respect to the lower mold (6).

2. The injection mold for easy ejection according to claim 1, characterized in that: An equipment cavity (16) is provided at the left end of the upper end surface of the lower mold (6), and the equipment cavity (16) is symmetrically arranged about the horizontal center of the lower mold (6).

3. The injection mold for easy ejection according to claim 2, characterized in that: An electric top block (2) is movably connected in the equipment cavity (16).

4. The injection mold for easy ejection according to claim 3, characterized in that: The right end surface of the lower mold (6) is fixedly connected to an air filling chamber (10), and the right end of the inner top surface of the air filling chamber (10) is fixedly connected to a motor (11), and the left shaft end of the motor (11) is fixedly connected to a continuously variable transmission (12); the lower end surface of the continuously variable transmission (12) is fixedly connected to the inner bottom surface of the air filling chamber (10); the left output end of the continuously variable transmission (12) is fixedly connected to a reciprocating threaded rod (15), and the left end of the reciprocating threaded rod (15) is connected to a bearing on the left inner end surface of the air filling chamber (10).

5. The injection mold for easy ejection according to claim 4, characterized in that: The reciprocating threaded rod (15) is threadedly connected to a piston plate (14), and the lower end surface of the piston plate (14) is slidably connected to the inner bottom surface of the inflation chamber (10).

6. The injection mold for easy ejection according to claim 5, characterized in that: A No. 1 one-way valve (13) is fixedly connected to the left end of the upper end surface of the inflatable chamber (10), and the No. 1 one-way valve (13) passes through the upper end surface of the inflatable chamber (10); a No. 2 one-way valve (1) is fixedly connected to the lower end of the left end surface of the inflatable chamber (10), and the No. 2 one-way valve (1) passes through the left end surface of the inflatable chamber (10).

7. The injection mold for easy ejection according to claim 6, characterized in that: An air intake pipe (4) is embedded inside the right end of the lower mold (6), and an air intake valve (3) is slidably connected to the upper end surface of the air intake pipe (4); the upper end surface of the air intake valve (3) is fixedly connected to the lower end surface of the electric ejector block (2).

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