Mold exhaust structure and injection mold

Abstract

The utility model belongs to the technical field of exhaust of injection molds, and discloses a mold exhaust structure and an injection mold. The mold exhaust structure comprises an exhaust barrel, an end cover and a gas transmission assembly, and an exhaust channel is formed in the exhaust barrel and communicated with the interior and the exterior of the mold. The end cover is connected to the end, located outside the mold, of the exhaust cylinder in a sealed mode and provided with a first through hole and a second through hole, and the first through hole and the second through hole both communicate with the exhaust channel. The air conveying assembly is provided with an air suction port and an air blowing port, the air suction port communicates with the first through hole, the air blowing port communicates with the second through hole, and the air conveying assembly is used for sucking and blowing air into the exhaust barrel. Air can be sucked into the exhaust channel through the air conveying assembly, air in the mold is sucked out, timely exhaust of the air in the mold is achieved, surface defects of products caused by high-temperature and high-pressure air formed in the mold are avoided, the product quality is guaranteed, the flowing resistance of materials in the mold can be reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust of injection molds, in particular to an exhaust structure of a mold and an injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products, including a front mold and a rear mold that can be opened and closed. When the rear mold and the front mold are closed, a product cavity consistent with the product structure is formed between the rear mold and the front mold. During injection molding, the heat-melted plastic is injected into the product cavity by a high pressure of an injection molding machine, and a formed plastic product is obtained after cooling and solidification. During the injection molding process, if the gas in the mold cannot be effectively discharged, it may cause defects such as bubbles, shrinkage, lack of glue, whitening or black spots in the product. Therefore, it is crucial to timely discharge the gas in the cavity to ensure the product quality.

[0003] In the prior art, by adding inserts to the places where the mold needs to exhaust, the mating gaps of the inserts can be used to help discharge the gas, ensuring the quality and appearance of the injection molded product. However, the exhaust inserts of the existing molds need the gas in the cavity to reach a certain pressure before being discharged from the exhaust inserts, so that the gas accumulates at the position of the colloid fusion and cannot be discharged in time and thoroughly. As the cavity is filled, the temperature of the gas compressed by high pressure rises sharply, thus burning the rubber material, resulting in surface defects such as discoloration and blackening, air marks, bubbles, shrinkage holes, etc. of the rubber material due to overheating.

[0004] Therefore, there is an urgent need for an exhaust structure of a mold and an injection mold to solve the above problems. Summary of the Utility Model

[0005] One object of the utility model is to provide an exhaust structure of a mold, which can suck out the gas in the mold cavity, avoid burning the product by high-temperature and high-pressure gas, and ensure the product quality.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provide an exhaust structure of a mold, including:

[0008] An exhaust cylinder, the exhaust cylinder forms an exhaust passage, and the exhaust passage communicates with the inner cavity of the mold and the outside;

[0009] An end cap, the end cap is sealingly connected to one end of the exhaust cylinder located outside the mold, the end cap is provided with a first through hole and a second through hole, and both the first through hole and the second through hole communicate with the exhaust passage;

[0010] An air delivery assembly, the air delivery assembly is provided with an air suction port and an air blowing port, the air suction port communicates with the first through hole, the air blowing port communicates with the second through hole, and the air delivery assembly is used for sucking and blowing air in the exhaust cylinder.

[0011] As an alternative solution of the mold exhaust structure, the mold exhaust structure further includes an exhaust needle, and the exhaust needle is located in the exhaust passage and connected to the inner wall of the end of the exhaust cylinder communicating with the mold cavity.

[0012] As an alternative solution of the mold exhaust structure, the exhaust cylinder includes a first cylinder body and a second cylinder body. The first cylinder body is connected to the end cover, the second cylinder body communicates with one end of the first cylinder body facing the mold, and the cross-sectional area of the second cylinder body is smaller than that of the first cylinder body.

[0013] As an alternative solution of the mold exhaust structure, the air delivery assembly includes a first control switch, and the first control switch is used to control the opening or closing of the air suction port.

[0014] As an alternative solution of the mold exhaust structure, the air delivery assembly further includes a second control switch, and the second control switch is used to control the opening or closing of the air blowing port.

[0015] As an alternative solution of the mold exhaust structure, the mold exhaust structure further includes a sealing ring, and the sealing ring is arranged between the end cover and the exhaust cylinder.

[0016] As an alternative solution of the mold exhaust structure, the air delivery assembly further includes an air compression mechanism, and the air compression mechanism communicates with the air suction port and the air blowing port.

[0017] As an alternative solution of the mold exhaust structure, the air delivery assembly further includes a silencing element, the silencing element is connected to the air compression mechanism, and the silencing element is used to eliminate noise for the air delivery assembly.

[0018] As an alternative solution of the mold exhaust structure, two silencing elements are provided, and the two silencing elements are respectively connected to the air suction port and the air blowing port.

[0019] Another object of the present invention is to provide an injection mold that can timely discharge the gas in the mold cavity and improve the surface quality of the product.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] Provide an injection mold, including a mold body and the above-mentioned mold exhaust structure. A mold cavity is formed inside the mold body, and the exhaust cylinder communicates with the outside of the mold body and the mold cavity.

[0022] The beneficial effects of the present invention:

[0023] The utility model provides a mold exhaust structure. The suction port of the air delivery component is sequentially communicated with a first through hole, an exhaust passage and the inside of the mold. By sucking air into the exhaust passage through the air delivery component, the gas inside the mold is sucked out, so as to realize the timely discharge of the gas inside the mold, avoid the formation of high-temperature and high-pressure gas inside the mold, which may cause defects such as blackening, air marks, bubbles, shrinkage holes, etc. on the surface of the product, ensure the product quality, and can reduce the resistance of the material flow inside the mold, improving the production efficiency. In addition, the blowing port of the air delivery component is communicated with a second through hole and the exhaust passage. By blowing air into the exhaust passage through the air delivery component, the exhaust passage can be cleaned before using the mold, preventing blockage and failure caused by excessive impurities in the exhaust passage after long-term use, avoiding the need to disassemble and clean the exhaust cylinder, reducing the working intensity, eliminating the influence on the assembly accuracy of the mold exhaust structure and the mold due to frequent disassembly, and further improving the production efficiency as the cleaning does not require shutdown.

[0024] The utility model also provides an injection mold, which includes a mold body and the above-mentioned mold exhaust structure. After the injection mold is used, the mold exhaust structure can automatically remove the sundries in the exhaust cylinder. When the injection mold is working, the gas in the mold body can be discharged in time by using the mold exhaust structure, ensuring the quality of the injection-molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an internal assembly schematic diagram of the exhaust cylinder of the mold exhaust structure provided by the utility model;

[0026] Figure 2 is a schematic structural diagram of the mold exhaust structure provided by the utility model.

[0027] In the figure:

[0028] 1. Exhaust cylinder; 11. Exhaust passage; 12. First cylinder body; 13. Second cylinder body; 14. Connection part;

[0029] 2. End cover; 21. First through hole; 22. Second through hole;

[0030] 3. Air delivery component; 31. Suction port; 32. Blowing port; 33. First control switch; 34. Second control switch; 35. Air compression mechanism; 351. Intake joint; 352. Main body part; 36. Sound absorption element;

[0031] 4. Exhaust needle;

[0032] 5. Sealing ring;

[0033] 6. Connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0038] As Figures 1 to 2 shown, the mold exhaust structure of this embodiment includes an exhaust cylinder 1, an end cap 2, and an air delivery assembly 3. The exhaust cylinder 1 forms an exhaust passage 11, and the exhaust passage 11 communicates with the inside and outside of the mold. The end cap 2 is sealingly connected to one end of the exhaust cylinder 1 located outside the mold. The end cap 2 is provided with a first through hole 21 and a second through hole 22, and both the first through hole 21 and the second through hole 22 communicate with the exhaust passage 11. The air delivery assembly 3 is provided with an air suction port 31 and an air blowing port 32. The air suction port 31 communicates with the first through hole 21, and the air blowing port 32 communicates with the second through hole 22. The air delivery assembly 3 is used for sucking and blowing air in the exhaust cylinder 1.

[0039] Based on the above design, the suction port 31 of the gas transmission component 3 is sequentially connected to the first through hole 21, the exhaust passage 11, and the inside of the mold. Through the gas transmission component 3, air can be sucked into the exhaust passage 11, and then the gas inside the mold can be sucked out, realizing the timely discharge of the gas inside the mold, avoiding the formation of high-temperature and high-pressure gas inside the mold, which may cause defects such as blackening, gas marks, bubbles, and shrinkage holes on the product surface, ensuring the product quality, and reducing the resistance of the material flow inside the mold, improving the production efficiency.

[0040] It should be noted that after the exhaust insert of the existing mold is used for a long time in production, due to the accumulation of impurities in the exhaust insert, it is easy to cause blockage, resulting in exhaust failure and product defects. At this time, production needs to be stopped and the exhaust insert needs to be removed and cleaned separately, which not only affects the production efficiency, but also the frequent disassembly and assembly of the exhaust insert will affect the assembly accuracy between the insert and the mold, resulting in poor product appearance. Using the mold exhaust structure provided in this embodiment, the blowing port 32 of the gas transmission component 3 is connected to the second through hole 22 and the exhaust passage 11. By blowing air into the exhaust passage 11 through the gas transmission component 3, the exhaust passage 11 can be cleaned before using the mold, preventing blockage and failure caused by excessive impurities in the exhaust passage 11 after long-term use. There is no need to disassemble and clean the exhaust cylinder 1, reducing the workload, eliminating the assembly error between the mold exhaust structure and the mold caused by frequent disassembly, and further improving the production efficiency as no shutdown is required during cleaning.

[0041] Specifically, the gas transmission component 3 further includes an air compression mechanism 35. The air compression mechanism 35 is provided with an air inlet joint 351 and a main body portion 352. One end of the main body portion 352 is connected to the air inlet joint 351, and the other end is connected to the suction port 31 and the blowing port 32. When the gas transmission mechanism 3 sucks air from the exhaust cylinder 1, the air compression mechanism 35 compresses the gas extracted from the exhaust passage 11, making the air pressure in the exhaust passage 11 lower than the air pressure in the cavity. Optionally, at this time, the air pressure in the exhaust passage 11 is 0.4 MPa less than the air pressure in the cavity. Under the action of the pressure difference, the gas in the cavity is discharged. When the exhaust cylinder 1 needs to be cleaned, the air compression mechanism 35 injects compressed air into the exhaust passage 11. Optionally, at this time, the air pressure in the exhaust passage 11 is 0.6 MPa greater than the outside, so that the impurities in the exhaust passage 11 are discharged under the action of the air pressure, realizing the cleaning of the exhaust passage 11.

[0042] Furthermore, the gas transmission component 3 further includes a first control switch 33 and a second control switch 34. The first control switch 33 is used to control the opening or closing of the suction port 31, and the second control switch 34 is used to control the opening or closing of the blowing port 32. Specifically, the first control switch 33 and the second control switch 34 are installed on the air compression mechanism 35 to achieve a compact structure of the gas transmission component 3. Optionally, the first control switch 33 and the second control switch 34 are solenoid valve switches, which are convenient for operation and control.

[0043] Further, the air delivery assembly 3 further includes a silencing element 36. The silencing element 36 is connected to the air compression mechanism 35 and is used to eliminate noise from the air delivery assembly 3 and maintain a healthy working environment. Optionally, two silencing elements 36 are provided, and the two silencing elements 36 are respectively connected to the air inlet 31 and the air blowing port 32, thereby improving the silencing effect.

[0044] Optionally, the mold exhaust structure further includes two connecting pipes 6. One connecting pipe 6 communicates between the air inlet 31 and the first through hole 21, and the other connecting pipe 6 communicates between the air blowing port 32 and the second through hole. By providing the connecting pipes 6, it is convenient to adjust the distance between the air delivery assembly 3 and the exhaust cylinder 1 and the position of the air delivery assembly 3, improving the convenience of operation.

[0045] Further, the mold exhaust structure further includes a sealing ring 5. The sealing ring 5 is provided between the end cover 2 and the exhaust cylinder 1 to ensure the sealing effect between the end cover 2 and the exhaust cylinder 1. In this embodiment, the end cover 2 and the exhaust cylinder 1 are connected by threads. One end of the end cover 2 is provided with external threads, and one end of the exhaust passage 1 is provided with internal threads. The sealing ring 5 is provided on the side of the exhaust cylinder 1 facing the end cover 2. When the end cover 2 is threadedly connected to the exhaust cylinder 1, the sealing ring 5 is compressed between the end cover 2 and the exhaust cylinder 1.

[0046] Further, the exhaust cylinder 1 includes a first cylinder body 12, a second cylinder body 13 and a connecting portion 14. The first cylinder body 12 is connected to the end cover 2. The second cylinder body 13 communicates with one end of the first cylinder body 12 facing the mold. The cross-sectional area of the second cylinder body 13 is smaller than that of the first cylinder body 12. The connecting portion 14 communicates between the first cylinder body 12 and the second cylinder body 13. By reducing the cross-sectional area of the second cylinder body 13, the flow rate of air passing through the second cylinder body 13 can be increased, which is beneficial to improving the exhaust effect of the cavity and the cleaning effect of the inner wall of the second cylinder body 13. The connecting portion 14 is a conical structure to realize the transitional change of the cross-sectional area of the exhaust passage 11.

[0047] Further, the mold exhaust structure further includes an exhaust needle 4. The exhaust needle 4 is located in the exhaust passage 11 and is connected to the inner wall of the end of the exhaust cylinder 1 communicating with the mold cavity. In this embodiment, the exhaust needle 4 is a T-shaped structure. The head of the exhaust needle 4 can be limited in the connecting portion 13, and the tail of the exhaust needle 4 can extend out of the exhaust passage 11 along the second cylinder body 13 to ensure that the gas in the mold can flow smoothly, thereby avoiding gas accumulation.

[0048] This embodiment also provides an injection mold, which includes a mold body and the above-mentioned mold exhaust structure. A cavity is formed inside the mold body, and the exhaust cylinder 1 is connected to the outside of the mold body and the cavity. Before using this injection mold, the mold exhaust structure can automatically remove the debris in the exhaust cylinder. When this injection mold is working, the mold exhaust structure can timely discharge the gas in the mold body to ensure the quality of the injection-molded product.

[0049] Specifically, the specific steps of using the injection mold of this embodiment are as follows: First, close the mold body to keep the cavity in a complete shape; turn on the first control switch 33 and fill the cavity with injection materials; perform pressure holding and cooling after the injection materials flow sufficiently; after the mold body is cooled to the preset temperature, open the mold body and take out the formed product; turn on the second control switch 34 to clean the exhaust cylinder 1, and then close the mold body again to form a working cycle.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A mold exhaust structure, characterized in that, Comprising: An exhaust pipe (1), the exhaust pipe (1) forms an exhaust passage (11), and the exhaust passage (11) communicates with the inside and outside of the mold; An end cover (2), the end cover (2) is sealingly connected to one end of the exhaust pipe (1) located outside the mold, the end cover (2) is provided with a first through hole (21) and a second through hole (22), and both the first through hole (21) and the second through hole (22) communicate with the exhaust passage (11); An air delivery component (3), the air delivery component (3) is provided with an air suction port (31) and an air blowing port (32), the air suction port (31) communicates with the first through hole (21), the air blowing port (32) communicates with the second through hole (22), and the air delivery component (3) is used for sucking and blowing air to the exhaust pipe (1).

2. The mold exhaust structure according to claim 1, wherein The mold exhaust structure further includes an exhaust needle (4), the exhaust needle (4) is located in the exhaust passage (11) and is connected to the inner wall of the exhaust pipe (1) at the end communicating with the mold cavity.

3. The mold exhaust structure according to claim 1, wherein The exhaust pipe (1) includes a first cylinder body (12) and a second cylinder body (13), the first cylinder body (12) is connected to the end cover (2), the second cylinder body (13) communicates with one end of the first cylinder body (12) facing the mold, and the cross-sectional area of the second cylinder body (13) is smaller than that of the first cylinder body (12).

4. The mold exhaust structure according to claim 1, characterized in that, The air delivery component (3) includes a first control switch (33), and the first control switch (33) is used to control the opening or closing of the air suction port (31).

5. The mold exhaust structure according to claim 1, wherein The air delivery component (3) further includes a second control switch (34), and the second control switch (34) is used to control the opening or closing of the air blowing port (32).

6. The mold exhaust structure according to claim 1, characterized in that, The mold exhaust structure further includes a sealing ring (5), and the sealing ring (5) is arranged between the end cover (2) and the exhaust pipe (1).

7. The mold exhaust structure according to any one of claims 1-6, characterized in that, The air delivery component (3) further includes an air compression mechanism (35), and the air compression mechanism (35) communicates with the air suction port (31) and the air blowing port (32).

8. The mold exhaust structure according to claim 7, wherein, The air delivery component (3) further includes a sound-absorbing element (36), the sound-absorbing element (36) is connected to the air compression mechanism (35), and the sound-absorbing element (36) is used to eliminate noise for the air delivery component (3).

9. The mold exhaust structure according to claim 8, wherein, There are two sound-absorbing elements (36), and the two sound-absorbing elements (36) are respectively connected to the air suction port (31) and the air blowing port (32).

10. An injection mold, characterized in that, Comprising a mold body and the mold exhaust structure according to any one of claims 1-9, a cavity is formed inside the mold body, and the exhaust pipe (1) communicates with the outside of the mold body and the cavity.

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