Air suction device and injection mold

Abstract

The utility model relates to the technical field of mold injection molding, and discloses an air suction device and an injection mold. The branch pipe is communicated with the header pipe; the branch pipe comprises a vertical pipe communicated with the main pipe; the transverse pipe is communicated with the vertical pipe; the transverse pipe is communicated with the cavity; the end pipe is communicated with the transverse pipe; the end pipe is communicated with the cavity; negative pressure is kept in the main pipe and the branch pipes through the negative pressure device, and air in the cavity penetrates through the gaps and is sucked into the end pipes or the transverse pipes; the branch pipes are smaller than the main pipe in diameter; according to the air suction device, the main pipe is connected with the external negative pressure device, the diameter of the branch pipe is small, the branch pipe is matched with the size of the cavity, so that the branch pipe is smoothly communicated with the cavity, the main pipe and the branch pipe are kept in a negative pressure state through the negative pressure device, and the purpose that air in the cavity is thoroughly exhausted is achieved. Gas in the micro cavity and the cavity at the tail end of injection molding is thoroughly exhausted by virtue of the branch pipes, so that the production efficiency and the product yield are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mold injection, in particular to an air suction device and an injection mold. Background Art

[0002] Injection molding is a processing method used in the mass production of certain parts with complex shapes. The specific principle is that the heated and melted plastic raw materials are pushed by the injection molding machine screw under high pressure into the mold cavity of the plastic mold. After cooling and solidification, the plastic molded product is obtained.

[0003] In injection molding production, air entrapment is one of the most common defects. Air entrapment refers to the phenomenon that during the process of injecting the rubber compound to fill the cavity, the gas in the cavity cannot be discharged in time or cannot be discharged from the injection mold, thus preventing the rubber compound from continuing to fill, resulting in injection defects such as material shortage and burning.

[0004] In the prior art, exhaust grooves are usually used to exhaust the gas in the mold cavity. However, for products with small dimensions and located at the end of injection molding, it is difficult for the exhaust grooves to completely exhaust the gas in the product cavity, resulting in trapped gas and burning, which in turn affects the yield of the finished product. In addition, the residual gas in the exhaust grooves and parting surfaces needs to be cleaned regularly, and the cleaning process requires shutdown, which greatly affects production efficiency. Utility Model Content

[0005] In view of this, the utility model provides an air suction device and an injection mold to solve the problems that air entrapment affects production, exhaust grooves are difficult to completely discharge gas from tiny parts, and residual gas in the exhaust path needs to be cleaned regularly, thus affecting production efficiency.

[0006] In the first aspect, the utility model provides an air suction device, comprising: a main pipe, connected to a negative pressure device; a branch pipe, one end of which is connected to the main pipe and the other end of which is connected to a cavity in a core of an injection mold; the branch pipe comprises: a vertical pipe, connected to the main pipe; a horizontal pipe, connected to the vertical pipe; the horizontal pipe is connected to a core body of the core close to the cavity; a gap is provided at the core body of the core close to the cavity, and the horizontal pipe is connected to the cavity via the gap; an end pipe is arranged at the horizontal pipe and connected to the horizontal pipe; the end pipe is connected to the core body of the core close to the cavity, and is connected to the cavity via the gap; wherein the negative pressure device is suitable for maintaining negative pressure in both the main pipe and the branch pipe, and the air in the cavity is sucked into the end pipe or the horizontal pipe through the gap; the diameter of the branch pipe is smaller than the diameter of the main pipe.

[0007] Beneficial effects: by setting interconnected main pipes and branch pipes, the main pipe is connected to an external negative pressure device, the diameter of the branch pipe is small and adapted to the size of the cavity, so that the branch pipe can be smoothly connected to the cavity, and the negative pressure device keeps the main pipe and the branch pipe in a negative pressure state, so that the gas in the cavity is completely sucked out, and discharged to the outside with the help of the branch pipe and the main pipe, so that the gas in the cavity is completely discharged, ensuring that the injection molding work proceeds smoothly, preventing the phenomenon of trapped air and burning, and effectively improving the yield rate of the finished product; at the same time, with the help of the branch pipe, the gas in the micro cavity and the cavity at the end of the injection molding is completely discharged, which is simple and reliable; and, since the negative pressure is maintained in the main pipe and the branch pipe, the gas in the cavity and the exhaust path is completely sucked out, and there is no need to clean the exhaust path additionally, which effectively improves production efficiency and has strong practicality.

[0008] In an optional embodiment, the vertical pipe is extended in a vertical direction, and the horizontal pipe is extended in a horizontal direction.

[0009] In an optional embodiment, a plurality of the vertical tubes are arranged around the column of the injection mold; a plurality of the horizontal tubes are connected in sequence, and a plurality of the mold cores are arranged around the column; wherein the plurality of the horizontal tubes are connected with the plurality of the vertical tubes to form an air suction frame surrounding the mold cores and the column.

[0010] In an optional embodiment, a plurality of the air suction frames are arranged at intervals, and the plurality of the air suction frames are all connected to the main pipe.

[0011] In an optional embodiment, the diameter of the branch pipe is D1, wherein 1mm≤D1≤4mm.

[0012] In an optional embodiment, the main pipe is arranged between the upper mold and the lower mold of the injection mold; one end of the vertical pipe is connected to the main pipe, and the other end extends upward in a vertical direction and passes through the upper mold.

[0013] In an optional embodiment, a sealing ring is provided on the vertical pipe at a position close to the upper mold.

[0014] In an optional embodiment, a plurality of the risers are arranged in parallel.

[0015] In an optional embodiment, a plurality of the main pipes are disposed between the upper mold and the lower mold, and the plurality of the main pipes are interconnected.

[0016] In the second aspect, the utility model provides an injection mold for an air suction device as described in any one of the above items, comprising: an upper mold; a lower mold; a cylinder, one end of the cylinder is connected to the lower mold, and the other end extends upward in the vertical direction and penetrates the upper mold; a mold core, one end of which is connected to the upper mold, and the other end extends upward in the vertical direction; a plurality of mold cores are arranged around the cylinder; a cavity, formed at one end of the mold core away from the upper mold; the core of the mold core has a gap near the core of the cavity; the diameter of the cavity is D2, where 0.4mm≤D2≤1mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the assembly state of the suction device and the injection mold of the utility model;

[0019] Figure 2 It is an enlarged schematic diagram of the A part of the utility model;

[0020] Figure 3 It is an internal schematic diagram of the assembly state of the suction device and the injection mold of the utility model;

[0021] Figure 4 It is an enlarged schematic diagram of the B part of the utility model;

[0022] Figure 5 It is a side schematic diagram of the assembly state of the suction device and the injection mold of the utility model;

[0023] Figure 6 It is an enlarged schematic diagram of the C portion of the present utility model;

[0024] Figure 7 It is a cross-sectional schematic diagram of the mold core of the utility model.

[0025] Description of reference numerals:

[0026] 1. Main pipe; 2. Branch pipe; 21. Vertical pipe; 22. Horizontal pipe; 23. End pipe; 3. Sealing ring; 4. Mold core; 41. Cavity; 42. Gap; 5. Column; 6. Suction frame; 7. Upper mold; 8. Lower mold. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0032] According to an embodiment of the utility model, on the one hand, an air suction device is provided, which is used to suck away the air in the cavity 41 before the mold is injected; the air suction device includes a main pipe 1 and a branch pipe 2, the main pipe 1 is connected to the negative pressure device; one end of the branch pipe 2 is connected to the main pipe 1, and the other end is connected to the cavity 41 at the core 4 of the injection mold; the branch pipe 2 includes: a vertical pipe 21, which is connected to the main pipe 1; a horizontal pipe 22, which is connected to the vertical pipe 21; the horizontal pipe 22 is connected to the core body of the core 4 close to the cavity 41; the core 4 close to the cavity 41 There is a gap 42 at the core body, and the cross tube 22 is connected to the cavity 41 via the gap 42; the end tube 23 is arranged at the cross tube 22 and is connected to the cross tube 22; the end tube 23 is connected to the core body of the mold core 4 close to the cavity 41, and is connected to the cavity 41 via the gap 42; wherein, the negative pressure device is suitable for maintaining negative pressure in both the main pipe 1 and the branch pipe 2, and the air in the cavity 41 is sucked into the end tube 23 or the cross tube 22 through the gap 42; the diameter of the branch pipe 2 is smaller than the diameter of the main pipe 1.

[0033] The injection mold includes an upper mold 7, a lower mold 8, a column 5, a core 4 and a cavity 41 formed at the core 4; one end of the core 4 is fixed to the upper mold 7, and part of the core body at the other end is recessed inward to form the cavity 41; the core 4 has a gap 42 near the cavity 41, and the gap 42 is respectively connected to the cavity wall of the cavity 41 and the outer peripheral wall of the core 4; the cross tube 22 and the end tube 23 are respectively connected to the core body of the core 4 near the cavity 41, and are connected to the cavity 41 through the gap 42.

[0034] The diameter D1 of the branch pipe 2 is in the range of 1 mm ≤ D1 ≤ 4 mm, and the diameter D2 of the cavity 41 is in the range of 0.4 mm ≤ D2 ≤ 1 mm. The cavity 41 is small in size, and the gas in the cavity 41 is difficult to be automatically and completely discharged from the gap 42 .

[0035] The cross pipe 22 includes a delivery cross pipe and an air suction cross pipe. An end pipe 23 is connected to the delivery cross pipe. The end pipe 23 is connected to the mold core 4 and communicated with the mold cavity 41. The end pipe 23 sucks out the gas in the mold cavity 41 and discharges it with the help of the delivery cross pipe; the air suction cross pipe is directly connected to the mold core 4 and communicated with the mold cavity 41. The air suction cross pipe sucks out the gas in the mold cavity 41 and discharges it with the help of the vertical pipe 21 and the main pipe 1.

[0036] The negative pressure device is arranged outside the injection mold, the branch pipe 2 is arranged inside the injection mold, and the main pipe 1 is extended outward from the inside of the injection mold until it is connected with the negative pressure device.

[0037] The specific working process of the suction device is as follows: before injection molding, the air in the cavity 41 needs to be completely removed; the negative pressure device is started to keep the interior of the main pipe 1, the vertical pipe 21, the horizontal pipe 22 and the end pipe 23 in a negative pressure state; the vertical pipe 21, the horizontal pipe 22 and the end pipe 23 are small in size and adapted to the size of the cavity 41, so that the end pipe 23 and the horizontal pipe 22 are smoothly connected to the core body of the mold core 4 near the cavity 41, and communicate with the cavity 41 through the gap 42; since the end pipe 23 and the horizontal pipe 22 are both under negative pressure, the pressure in the end pipe 23 and the horizontal pipe 22 is less than the pressure in the cavity 41, generating suction Effect: the air in the cavity 41 is sucked into the end pipe 23 and the transverse pipe 22 for air intake through the gap 42; since the main pipe 1, the vertical pipe 21 and the transverse pipe 22 always maintain negative pressure and are connected, the air in the end pipe 23 is discharged after passing through the transverse pipe 22, the vertical pipe 21 and the main pipe 1 in turn, and the air in the transverse pipe 22 for air intake is discharged after passing through the vertical pipe 21 and the main pipe 1 in turn; the air intake work continues until the air in the cavity 41 is completely and thoroughly discharged; since the main pipe 1 and the branch pipe 2 always maintain negative pressure, the degassing work is guaranteed to be complete and thorough, and the air intake and exhaust speed is fast, and the degassing efficiency is high.

[0038] In this embodiment, a main pipe 1 and a branch pipe 2 are arranged in communication, the main pipe 1 is connected to an external negative pressure device, the diameter of the branch pipe 2 is small and matched with the size of the cavity 41, so that the branch pipe 2 can smoothly communicate with the cavity 41, and the negative pressure device keeps the main pipe 1 and the branch pipe 2 in a negative pressure state, so that the gas in the cavity 41 is completely sucked out and discharged to the outside with the help of the branch pipe 2 and the main pipe 1, so that the gas in the cavity 41 is completely discharged, ensuring that the injection molding work proceeds smoothly, preventing the occurrence of trapped air and burning, and effectively improving the yield rate of the finished product; at the same time, the gas in the micro cavity 41 and the cavity 41 at the end of the injection molding is completely discharged with the help of the branch pipe 2, which is simple and reliable; and because the negative pressure is maintained in the main pipe 1 and the branch pipe 2, the gas in the cavity 41 and the exhaust path is completely sucked out, and there is no need to clean the exhaust path additionally, which effectively improves the production efficiency and has strong practicality.

[0039] In some embodiments, in combination Figure 3 As shown, the vertical pipe 21 is extended in the vertical direction, the horizontal pipe 22 is extended in the horizontal direction, and the end pipe 23 is arranged at the horizontal pipe 22; wherein, the vertical pipe 21 is used to determine the vertical position of the horizontal pipe 22 and the end pipe 23, and the vertical pipes 21 of different heights are selected according to the cavities 41 located at different vertical positions. At the same time, according to the cavities 41 located at different horizontal positions, the position of the end pipe 23 at the horizontal pipe 22 is changed. Under the dual action, the end pipe 23 is aligned at the cavity 41 to ensure the smooth progress of the suction process.

[0040] In some embodiments, in combination Figures 1 to 4As shown, a plurality of vertical tubes 21 are arranged at intervals around the column 5 of the injection mold, and the vertical tubes 21 are parallel to each other; a plurality of horizontal tubes 22 are connected in sequence and arranged around the column 5, and the horizontal tubes 22 are all in the same horizontal plane; a plurality of mold cores 4 are arranged around the column 5; wherein, a plurality of horizontal tubes 22 are connected with a plurality of vertical tubes 21 to form an air suction frame 6 surrounding the mold core 4 and the column 5; a plurality of the air suction frames 6 are arranged at intervals, and a plurality of the air suction frames 6 are all connected to the main pipe 1; the air suction frames 6 are arranged independently of each other.

[0041] Optionally, both ends of the transverse tube 22 are blocked, the transverse tubes 22 are cross-connected and connected, and the vertical tube 21 is connected and connected with the tube body of the transverse tube 22 or the intersection of the transverse tube 22 .

[0042] In some embodiments, in combination Figures 1 to 4 As shown, the main pipe 1 is arranged between the upper mold 7 and the lower mold 8 of the injection mold; one end of the vertical pipe 21 is connected to the main pipe 1, and the other end extends upward in the vertical direction and penetrates the upper mold 7; the vertical pipe 21 is provided with a sealing ring 3 at a position close to the upper mold 7 to prevent gas leakage in the vertical pipe 21.

[0043] In some embodiments, in combination Figure 3 As shown, the plurality of main pipes 1 are arranged between the upper mold 7 and the lower mold 8, and the plurality of main pipes 1 are interconnected; wherein the main pipes 1 are cross-connected, and the main pipes 1 are all located in the same horizontal plane.

[0044] On the other hand, the utility model provides an injection mold, including: an upper mold 7; a lower mold 8; a column 5, one end of the column 5 is connected to the lower mold 8, and the other end extends upward in the vertical direction and penetrates the upper mold 7; a core 4, one end of which is connected to the upper mold 7, and the other end extends upward in the vertical direction; a plurality of cores 4 are arranged around the column 5; a cavity 41, formed at one end of the core 4 away from the upper mold 7; the core 4 has a gap 42 at the core body close to the cavity 41; the diameter of the cavity 41 is D2, wherein 0.4mm≤D2≤1mm; the branch pipe 2 of the suction device is connected to the cavity 41, and the main pipe 1 is connected to the negative pressure device, which is used to suck out the air in the cavity 41 to ensure the smooth progress of the injection molding process.

[0045] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. An air suction device, characterized in that: include: A main pipe (1) connected to the negative pressure device; A branch pipe (2), one end of which is in communication with the main pipe (1), and the other end of which is in communication with a cavity (41) at a core (4) of the injection mold; The said sub-in-charge (2) comprises: A riser pipe (21) connected to the main pipe (1); A transverse tube (22) is connected to the vertical tube (21); the transverse tube (22) is connected to the core of the mold core (4) close to the mold cavity (41); the core of the mold core (4) close to the mold cavity (41) has a gap (42), and the transverse tube (22) is connected to the mold cavity (41) via the gap (42); The end tube (23) is arranged at the transverse tube (22) and is connected to the transverse tube (22); the end tube (23) is connected to the core body of the mold core (4) close to the mold cavity (41), and is connected to the mold cavity (41) via the gap (42); The negative pressure device is suitable for maintaining negative pressure in both the main pipe (1) and the branch pipe (2), and the air in the cavity (41) is sucked into the end pipe (23) or the cross pipe (22) through the gap (42); The diameter of the branch pipe (2) is smaller than the diameter of the main pipe (1).

2. The air suction device according to claim 1, characterized in that The vertical pipe (21) is extended in a vertical direction, and the horizontal pipe (22) is extended in a horizontal direction.

3. The air suction device according to claim 1, characterized in that A plurality of said risers (21) are arranged around the column (5) of the injection mold; The plurality of transverse tubes (22) are connected in sequence and arranged around the column (5). A plurality of the mold cores (4) are arranged around the column (5); Wherein, the plurality of transverse tubes (22) are connected to the plurality of vertical tubes (21) to form an air suction frame (6) surrounding the mold core (4) and the column (5).

4. The air suction device according to claim 3, characterized in that The plurality of air suction frames (6) are arranged at intervals, and the plurality of air suction frames (6) are all connected to the main pipe (1).

5. The air suction device according to claim 1, characterized in that The diameter of the branch pipe (2) is D1, wherein 1mm≤D1≤4mm.

6. The air suction device according to claim 1, characterized in that The main pipe (1) is arranged between an upper mold (7) and a lower mold (8) of an injection mold; One end of the vertical pipe (21) is connected to the main pipe (1), and the other end extends upward in a vertical direction and passes through the upper mold (7).

7. The air suction device according to claim 6, characterized in that A sealing ring (3) is sleeved on the vertical pipe (21) at a position close to the upper mold (7).

8. The air suction device according to claim 3, characterized in that: A plurality of risers (21) are arranged in parallel.

9. The air suction device according to claim 6, characterized in that The plurality of main pipes (1) are arranged between the upper mold (7) and the lower mold (8), and the plurality of main pipes (1) are arranged to be interconnected.

10. An injection mold for the air intake device according to any one of claims 1 to 9, characterized in that: include: Upper mold (7); Lower mold (8); A column (5), one end of which is connected to the lower mold (8), and the other end of which extends upward in a vertical direction and penetrates the upper mold (7); A mold core (4), one end of which is connected to the upper mold (7), and the other end of which is extended upward in a vertical direction; a plurality of mold cores (4) are arranged around the column (5); A mold cavity (41) is formed at one end of the mold core (4) away from the upper mold (7); a gap (42) is formed at the core of the mold core (4) close to the mold cavity (41); The diameter of the mold cavity (41) is D2, wherein 0.4 mm≤D2≤1 mm.

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