CN213082184U - Gas-assisted hollow injection mold - Google Patents
Gas-assisted hollow injection mold Download PDFInfo
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- CN213082184U CN213082184U CN202021773242.1U CN202021773242U CN213082184U CN 213082184 U CN213082184 U CN 213082184U CN 202021773242 U CN202021773242 U CN 202021773242U CN 213082184 U CN213082184 U CN 213082184U
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- pressure relief
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Abstract
The utility model belongs to the technical field of the cavity injection moulding technique and specifically relates to a gaseous auxiliary cavity injection mold is related to, it includes mould body and gaseous auxiliary device, this internal die cavity that is used for the shaping work piece that is equipped with of mould and the material chamber of depositing that is used for depositing the clout, gaseous auxiliary device is including communicating in the die cavity keep away from the needle valve of depositing material chamber one side and the air feeder that is connected with the needle valve, still include pressure relief device, pressure relief device includes pressure release needle and actuating mechanism, be connected with the air feed runner between needle valve and the die cavity, the air feed runner is used for forming the cavity waste material that is linked together with the work piece is inside, the pressure release needle is used for stretching into the cavity waste material inside of air feed runner, actuating mechanism is used for driving. Pressure relief device's structure is simple and easy in this application, when reaching the pressure release purpose, can effectively reduce gaseous auxiliary device's manufacturing and maintenance cost.
Description
Technical Field
The application relates to the technical field of hollow injection molding, in particular to a gas-assisted hollow injection mold.
Background
The gas-assisted hollow injection molding technology is a plastic injection molding technology developed on the basis of a structural foam molding process in the 80 th century, and the main working principle of the technology is that high-pressure inert gas is injected into molten plastic in a mold to form a hollow section and push molten materials to advance, so that the purpose of hollow injection molding is achieved.
The hollow injection mold for the hollow injection molding technology in the related technology mainly comprises a movable mold, a fixed mold and a gas auxiliary device, wherein the movable mold and the fixed mold are matched to form a cavity for molding a workpiece and a material storage cavity communicated with the cavity; the gas auxiliary device comprises a needle valve, a gas circuit and gas supply equipment, one end of the needle valve is communicated to one side, away from the material storage cavity, of the cavity, and the other end of the needle valve is connected with the gas supply equipment through the gas circuit.
In the actual injection molding process, the needle valve injects gas into molten plastic in the cavity to form a hollow section and pushes the molten material to flow into the material storage cavity, so that the aim of hollow injection molding is fulfilled; after the workpiece in the cavity is cooled, the needle valve is used for pumping out gas in the workpiece, so that the internal air pressure of the workpiece is reduced, and the deformation of the workpiece due to the overlarge internal air pressure in the die opening process is reduced.
In view of the above-mentioned related art, the gas assist device needs to have both gas supply and gas extraction functions, which is considered by the inventor to be relatively high in manufacturing and maintenance costs.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the manufacturing and maintenance costs of the gas auxiliary device are high, the application provides a gas-assisted hollow injection mold.
The application provides a cavity injection mold of gaseous supplementary adopts following technical scheme:
the utility model provides a gaseous auxiliary cavity injection mold, includes mould body and gaseous auxiliary device, this internal die cavity that is used for the shaping work piece that is equipped with of mould and the material chamber of depositing that is used for depositing the clout, gaseous auxiliary device still includes pressure relief device including communicating in the die cavity and keeping away from the needle valve of depositing material chamber one side and the air feeder that is connected with the needle valve, pressure relief device includes pressure release needle and actuating mechanism, be connected with the air feed runner between needle valve and the die cavity, the air feed runner is used for forming the cavity waste material that is linked together with the work piece is inside, the pressure release needle is used for stretching into the cavity waste material inside of air feed runner, actuating mechanism is used for driving the pressure release needle along stretching into or breaking away from the direction motion of.
By adopting the technical scheme, the gas supply equipment supplies gas to the pressure relief needle, the pressure relief needle conveys the gas to the molten plastic in the cavity through the gas supply runner to form a hollow section, and pushes the molten plastic to flow to the material storage cavity, so that the purpose of hollow injection molding of the workpiece is realized; gradually cooling and forming the workpiece, driving a pressure relief needle to be inserted into the hollow waste material of the air supply flow channel by using a driving mechanism, and separating the pressure relief needle from the hollow waste material again to enable the hollow waste material to form a hole communicated with the outside, wherein the hollow waste material is communicated with the inside of the workpiece, so that the inside of the workpiece is communicated with the outside to achieve the purpose of pressure relief; the pressure relief device is simple in structure, the purpose of pressure relief can be achieved, and the manufacturing and maintenance cost of the gas auxiliary device can be effectively reduced.
Preferably, a movable channel for moving the pressure relief needle is arranged in the die body, the movable channel comprises a sliding hole and a pressure relief hole which are communicated, and one end of the sliding hole, which is far away from the pressure relief hole, is communicated with the air supply flow channel; the hole section of the pressure relief hole is larger than that of the sliding hole, and one end of the pressure relief hole, which is far away from the sliding hole, penetrates through the fixed die and is communicated with the atmosphere; one end of the pressure relief needle is connected with the sliding hole in a sliding mode, and the other end of the pressure relief needle penetrates through the pressure relief hole and extends into the atmosphere; the driving mechanism is connected to one end, far away from the air supply flow channel, of the pressure relief needle.
By adopting the technical scheme, the pressure relief needle is in sliding fit with the sliding hole, so that the outer wall of the pressure relief needle can keep a good fit effect with the outer wall of the sliding hole, and the condition that molten plastic flows into the sliding hole from the air supply flow channel is effectively reduced in the injection molding and air supply processes; meanwhile, after the driving mechanism is used for driving the pressure relief needle to stretch into the hollow waste material in the air supply channel, the driving mechanism is used for driving the pressure relief needle to be separated from the air supply channel and enabling the end part of the pressure relief needle to be separated from the sliding hole and be located in the pressure relief hole, so that the inside of the hollow waste material is communicated with the outside atmosphere through the sliding hole and the pressure relief hole, and the purpose of pressure relief is achieved.
Preferably, the mould body comprises a movable mould and a fixed mould, the movable mould is driven to be close to or far away from the fixed mould, the fixed mould is relatively fixed with the injection molding machine, and the movable channel is arranged on the fixed mould.
Through adopting above-mentioned technical scheme, cover half and injection molding machine keep relatively fixed, will be used for supplying the interactive channel of pressure release needle activity to set up on the cover half, the actuating mechanism's of being convenient for installation.
Preferably, the movable channel is arranged along the moving direction of the movable die, and the sliding hole and the pressure relief hole are both round holes.
By adopting the technical scheme, the movable channel is convenient to open.
Preferably, the sliding hole is formed in one side, far away from the fixed die plate, of the fixed die core, and the pressure relief hole penetrates from the surface, far away from the fixed die core, of the fixed die plate to one end, close to the fixed die plate, of the sliding hole.
Through adopting above-mentioned technical scheme, the intercommunication department of pressure release hole and slide opening all is located the die benevolence, is convenient for realize lining up of pressure release hole and slide opening.
Preferably, the fixed die also comprises a fixed die base plate and a fixed die cushion block, and the fixed die base plate is arranged on one side of the fixed die plate, which is far away from the fixed die core; the fixed die cushion block is arranged between the fixed die base plate and the fixed die plate so as to form an interval between the fixed die base plate and the fixed die plate; the driving mechanism comprises a hydraulic oil cylinder arranged between the fixed die base plate and the fixed die plate, and the hydraulic oil cylinder is used for driving the pressure relief needle to move.
By adopting the technical scheme, the pressure relief needle can be driven to move by using the hydraulic oil cylinder, and the fixed die base plate and the fixed die plate are convenient to install by the aid of the interval between the fixed die base plate and the fixed die plate.
Preferably, one end of the sliding hole, which is close to the pressure relief hole, is provided with a guide reaming hole, and the hole section of the guide reaming hole is gradually increased along the direction close to the pressure relief hole.
Through adopting above-mentioned technical scheme, when pressure release needle tip stretched into the slide opening from the pressure release hole, utilized direction reaming can play good guide effect to the pressure release needle.
Preferably, the pressure relief needle positioned in the pressure relief hole is movably sleeved with a linear spring and a sealing ring, the sealing ring is smaller than the pressure relief hole, and the sealing ring is used for sealing one end of the sliding hole close to the pressure relief hole; the linear spring is arranged between the sealing ring and the pressure relief hole and used for keeping the sealing state of the sealing ring to the sliding hole.
By adopting the technical scheme, in the process of injection molding and air supply, the sealing ring is used for sealing one end of the slide hole close to the pressure relief hole, so that the condition that molten plastic flows into the slide hole from the air supply runner can be reduced.
In summary, the present application includes at least one of the following beneficial technical effects:
the pressure relief device is simple in structure, and can effectively reduce the manufacturing and maintenance cost of the gas auxiliary device while achieving the purpose of pressure relief;
the sliding hole is arranged on the fixed die core, and the pressure relief hole is arranged on the fixed die plate, so that the processing is convenient;
in the process of injection molding and air supply, the sealing ring is used for sealing one end, close to the pressure relief hole, of the slide hole, so that the condition that molten plastic flows into the slide hole from the air supply runner can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a fixed mold in embodiment 1 of the present application.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
FIG. 3 is a schematic sectional view of a stationary mold in example 1 of this application.
Fig. 4 is an enlarged schematic structural view of a portion B in fig. 3.
Fig. 5 is an enlarged schematic view of a portion C of fig. 3.
FIG. 6 is a schematic sectional view of a stationary mold in example 2 of this application.
Fig. 7 is an enlarged schematic view of a portion D in fig. 6.
Description of reference numerals: 1. a fixed die base plate; 2. fixing a die cushion block; 3. fixing a template; 31. a pressure relief vent; 4. fixing a mold core; 41. a slide hole; 411. guiding and reaming; 5. a needle valve; 6. a workpiece; 7. a storage cavity; 71. excess materials; 8. hollow waste material; 91. a pressure relief needle; 911. a linear spring; 912. a seal ring; 913. a fixing ring; 92. a hydraulic cylinder; 93. a connecting rod; 94. a guide frame; 941. and (4) a guide hole.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
Example 1:
referring to fig. 1, the embodiment of the application discloses a gas-assisted hollow injection mold, which comprises a mold body, a gas-assisted device and a pressure relief device, wherein the mold body comprises a movable mold and a fixed mold which are matched with each other. The movable mold is driven to be close to or far away from the fixed mold, the fixed mold is installed on the injection molding machine, and the fixed mold and the injection molding machine are kept relatively fixed. Meanwhile, the fixed mold and the movable mold are formed with a cavity for molding the workpiece 6 and a stock cavity 7 for storing the surplus 71.
Referring to fig. 1, the fixed mold comprises a fixed mold base plate 1, a fixed mold cushion block 2, a fixed mold plate 3 and a fixed mold core 4, wherein the fixed mold base plate 1 is connected with an injection molding machine, and the fixed mold plate 3 is mounted on the fixed mold base plate 1 through the fixed mold cushion block 2, so that an interval is formed between the fixed mold plate 3 and the fixed mold base plate 1; meanwhile, the fixed mold core 4 is arranged on one side of the fixed mold plate 3 departing from the fixed mold base plate 1.
Referring to fig. 1 and 2, the gas assist device is connected to the fixed mold, and specifically, the gas assist device includes a needle valve 5 and a gas supply device; wherein, the needle valve 5 is installed on the fixed die plate 3, and the needle valve 5 is communicated with one side of the die cavity far away from the material storage cavity 7 to form an air supply flow channel. In the injection molding process, the air supply channel can form hollow waste 8 with a hollow interior, and the hollow waste 8 is communicated with the interior of the workpiece 6 in the cavity. The gas supply device is connected to the needle valve 5 for supplying high-pressure nitrogen gas to the needle valve 5.
Referring to fig. 2 and 3, after the workpiece 6 in the cavity is molded, the pressure relief device is used for relieving high air pressure inside the workpiece 6, and specifically, the pressure relief device comprises a pressure relief needle 91 and a driving mechanism; wherein, set up the movable passage that supplies pressure release needle 91 activity on the cover half, the movable passage sets up along the direction that the movable mould is close to or keeps away from the cover half, and the position of movable passage corresponds with the position of air feed runner.
Referring to fig. 3 and 4, the movable passage includes a sliding hole 41 and a pressure relief hole 31, wherein the sliding hole 41 is opened on one side of the fixed mold core 4 away from the fixed mold plate 3 along the thickness direction of the fixed mold core 4, one end of the sliding hole 41 is located in the fixed mold core 4, and the other end of the sliding hole 41 penetrates through the surface of the fixed mold plate 3 away from the fixed mold core 4, so that the sliding hole 41 is communicated with the air supply flow passage.
Referring to fig. 4 and 5, the pressure relief hole 31 penetrates through one end of the fixed mold core 4, which is close to the fixed mold plate 3, of the slide hole 41 from one side of the fixed mold plate 3, which is away from the slide hole 41, the pressure relief hole 31 and the slide hole 41 are circular holes concentrically arranged, and meanwhile, the aperture of the pressure relief hole 31 is larger than that of the slide hole 41. In addition, one end of the slide hole 41 close to the relief hole 31 is provided with a guide counterbore 411, and the hole diameter of the guide counterbore 411 gradually increases in the direction close to the relief hole 31.
Referring to fig. 4 and 5, the pressure relief needle 91 is installed in the movable channel, specifically, one end of the pressure relief needle 91 is slidably connected to the sliding hole 41, and the outer wall of the pressure relief needle 91 is attached to the inner wall of the sliding hole 41; the other end of the pressure relief needle 91 passes through the pressure relief hole 31 and extends out of the fixed die plate 3 towards the surface of the fixed die base plate 1.
Referring to fig. 3 and 5, a driving mechanism is installed in the space between the fixed mold plate 3 and the fixed mold base plate 1 for driving the pressure relief needle 91 to move in the direction of extending into or separating from the air supply flow channel; specifically, the driving mechanism includes a hydraulic cylinder 92, a connecting rod 93, and a guide frame 94. Wherein, hydraulic cylinder 92 is fixed on the fixed die base plate 1, and the connecting rod 93 sets up along the length direction of pressure release needle 91, and the connecting rod 93 is used for being connected hydraulic cylinder 92's piston rod with pressure release needle 91. The guide frame 94 is installed on the surface of the fixed die plate 3 facing the fixed die base plate 1, and the guide frame 94 is provided with a guide hole 941 matched with the pressure relief needle 91 in a sliding manner, so that a guide effect is achieved for the movement of the pressure relief needle 91.
The implementation principle of the embodiment of the application is as follows: the gas supply device supplies gas to the pressure relief needle 91, the pressure relief needle 91 conveys the gas into the molten plastic in the cavity through the gas supply flow passage to form a hollow section, and pushes the molten plastic to flow into the material storage cavity 7, so that the purpose of hollow injection molding of the workpiece 6 is realized.
Example 2:
referring to fig. 6 and 7, the embodiment of the present application discloses a gas-assisted hollow injection mold, which is different from embodiment 1 in that: still the activity cup joints linear spring 911 and sealing ring 912 on being located the pressure release needle 91 in pressure release hole 31, wherein, sealing ring 912 is less than the aperture of pressure release hole 31, and sealing ring 912 and direction reaming 411 looks adaptation for seal direction reaming 411. Simultaneously, last still integrated into one piece of pressure release needle 91 has solid fixed ring 913, and solid fixed ring 913 is less than the aperture of pressure release hole 31, and gu fixed ring 913 is located one side that sealing ring 912 deviates from direction reaming 411.
Referring to fig. 6 and 7, the linear spring 911 is located between the sealing ring 912 and the fixing ring 913, and one end of the linear spring 911, hougard, is connected to the sealing ring 912 and the other end is connected to the fixing ring 913. When the pressure relief needle 91 is located in the sliding hole 41 and the end of the pressure relief needle 91 is flush with the end of the sliding hole 41 away from the pressure relief hole 31, the elastic force of the linear spring 911 is utilized to make the sealing ring 912 tightly seal the guide counterbore 411. When the end of the relief needle 91 is disengaged from the slide hole 41 to the relief hole 31, the seal ring 912 is separated from the guide counterbore 411.
The implementation principle of the embodiment of the application is as follows: in the injection molding and air supply processes, when the pressure relief needle 91 is positioned in the sliding hole 41 and the end part of the pressure relief needle 91 is flush with one end of the sliding hole 41 far away from the pressure relief hole 31; at this time, the outer wall of the pressure release needle 91 is attached to the inner wall of the slide hole 41, and the sealing ring 912 is pressed against the guide counterbore 411 by the elastic force of the linear spring 911 to block the communication state between the slide hole 41 and the pressure release hole 31. Thereby effectively reducing the flow of molten plastic from the supply channel into the slide opening 41. When the end of the pressure relief needle 91 slides out from the slide hole 41 to the pressure relief hole 31, the sealing ring 912 is also separated from the guide counterbore 411, so that the slide hole 41 is communicated with the pressure relief hole 31, thereby achieving the purpose of pressure relief.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a supplementary cavity injection mold of gas, includes mould body and gaseous auxiliary device, this internal die cavity that is used for shaping work piece (6) that is equipped with of mould and deposit material chamber (7) that are used for depositing clout (71), gaseous auxiliary device is including communicating needle valve (5) of keeping away from in the die cavity and depositing material chamber (7) one side and the air feeder who is connected with needle valve (5), its characterized in that: still include pressure relief device, pressure relief device includes pressure relief needle (91) and actuating mechanism, be connected with the air feed runner between needle valve (5) and the die cavity, the air feed runner is used for forming cavity waste material (8) that are linked together with work piece (6) inside, pressure relief needle (91) are used for stretching into inside cavity waste material (8) of air feed runner, actuating mechanism is used for driving pressure relief needle (91) along stretching into or breaking away from the direction motion of air feed runner.
2. A gas-assisted hollow injection mold according to claim 1, characterized in that: a movable channel for moving the pressure relief needle (91) is arranged in the die body and comprises a sliding hole (41) and a pressure relief hole (31) which are communicated, and one end, far away from the pressure relief hole (31), of the sliding hole (41) is communicated with an air supply flow channel; the hole section of the pressure relief hole (31) is larger than that of the sliding hole (41), and one end, far away from the sliding hole (41), of the pressure relief hole (31) penetrates through the fixed die and is communicated with the atmosphere; one end of the pressure relief needle (91) is connected with the sliding hole (41) in a sliding mode, and the other end of the pressure relief needle penetrates through the pressure relief hole (31) and extends into the atmosphere; the driving mechanism is connected to one end, far away from the air supply flow channel, of the pressure relief needle (91).
3. A gas-assisted hollow injection mold according to claim 2, characterized in that: the mould body includes movable mould and cover half, the movable mould is used for being driven and is close to or keeps away from the cover half, the cover half is fixed relatively with the injection molding machine, movable channel locates on the cover half.
4. A gas-assisted hollow injection mold according to claim 3, characterized in that: the movable channel is arranged along the moving direction of the movable die, and the sliding hole (41) and the pressure relief hole (31) are round holes.
5. A gas-assisted hollow injection mould according to claim 4, characterized in that: the sliding hole (41) is formed in one side, far away from the fixed die plate (3), of the fixed die core (4), and the pressure relief hole (31) penetrates from the surface, far away from the fixed die core (4), of the fixed die plate (3) to one end, close to the fixed die plate (3), of the sliding hole (41).
6. A gas-assisted hollow injection mould according to claim 5, characterized in that: the fixed die also comprises a fixed die base plate (1) and a fixed die cushion block (2), wherein the fixed die base plate (1) is arranged on one side of the fixed die plate (3) far away from the fixed die core (4); the fixed die cushion block (2) is arranged between the fixed die base plate (1) and the fixed die plate (3) so as to form an interval between the fixed die base plate (1) and the fixed die plate (3); the driving mechanism comprises a hydraulic oil cylinder (92) arranged between the fixed die base plate (1) and the fixed die plate (3), and the hydraulic oil cylinder (92) is used for driving the pressure relief needle (91) to move.
7. A gas-assisted hollow injection mold according to claim 2, characterized in that: one end of the sliding hole (41) close to the pressure relief hole (31) is provided with a guide reaming hole (411), and the hole section of the guide reaming hole (411) is gradually increased along the direction close to the pressure relief hole (31).
8. A gas-assisted hollow injection mold according to claim 2, characterized in that: a linear spring (911) and a sealing ring (912) are movably sleeved on a pressure relief needle (91) positioned in the pressure relief hole (31), the sealing ring (912) is smaller than the pressure relief hole (31), and the sealing ring (912) is used for sealing one end, close to the pressure relief hole (31), of the sliding hole (41); the linear spring (911) is arranged between the sealing ring (912) and the pressure relief hole (31) and used for keeping the sealing state of the sealing ring (912) to the sliding hole (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021773242.1U CN213082184U (en) | 2020-08-22 | 2020-08-22 | Gas-assisted hollow injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021773242.1U CN213082184U (en) | 2020-08-22 | 2020-08-22 | Gas-assisted hollow injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213082184U true CN213082184U (en) | 2021-04-30 |
Family
ID=75631482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021773242.1U Active CN213082184U (en) | 2020-08-22 | 2020-08-22 | Gas-assisted hollow injection mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213082184U (en) |
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2020
- 2020-08-22 CN CN202021773242.1U patent/CN213082184U/en active Active
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