CN214239405U - Gas-assisted mold gas needle and gas-assisted device - Google Patents
Gas-assisted mold gas needle and gas-assisted device Download PDFInfo
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- CN214239405U CN214239405U CN202023344670.5U CN202023344670U CN214239405U CN 214239405 U CN214239405 U CN 214239405U CN 202023344670 U CN202023344670 U CN 202023344670U CN 214239405 U CN214239405 U CN 214239405U
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Abstract
The utility model relates to a gas-assisted mould gas needle and gas-assisted equipment, which comprises a gas joint, a fixed seat, an outer gas needle, an inner gas needle and a driving mechanism, wherein the outer gas needle is fixedly arranged on the fixed seat and is provided with a through hole; one end of the inner air needle is positioned in the fixed seat, and the other end of the inner air needle penetrates through the through hole of the outer air needle; the driving mechanism is fixedly connected with the inner air needle and can drive the inner air needle to move; when the inner air needle is at the first limit position, the inner air needle closes the air outlet of the outer air needle; when the inner air needle is at the second limit position, the air outlet of the outer air needle is opened. The utility model discloses improved the gas needle structure, interior gas needle can reciprocate and then open or seal outer gas needle air inlet, need not worry plastics melten gel backward flow in the stage of moulding plastics when sealing, opens the clearance of admitting air that can increase the gas needle again when aerifing, has improved the return air volume of admitting air of unit interval greatly, shortens the return air time of admitting air.
Description
Technical Field
The utility model relates to an injection moulding equipment field is assisted to gas, concretely relates to mould gas needle and gas are assisted to gas and equipment is assisted.
Background
The gas-assisted molding is an injection molding technology which is characterized in that when plastic is properly filled into a cavity (75-99.9%), inert high-pressure nitrogen is injected, the gas pushes molten plastic to continuously fill the cavity, and the pressure maintaining process is used for replacing the pressure maintaining process of the plastic. The advantages of gas-assisted molding are many, such as reducing the residual stress of the product and enabling the product not to deform; the problem of sink marks on the surface of a product is solved and eliminated, and the method is applied to products with large thickness variation; the product production molding cycle time is shortened, and the production efficiency is improved; saving plastic raw materials.
The process of gas-assisted injection molding can be summarized as follows:
and (3) injection molding period: the cavity is filled with a certain amount of plasticized plastic. The amount of plastic required is found by experimentation to ensure that during the nitrogen charge, the gas does not burst the surface of the finished product and that an ideal nitrogen charge volume is achieved.
And (3) an aeration period: the gas can be injected at different times during or after injection, and the pressure of the gas injection must be greater than the injection pressure to achieve a hollow state of the product.
And (4) a pressure maintaining period: when the interior of the finished product is filled with gas, the pressure of the gas in the hollow part of the finished product becomes the pressure maintaining pressure, and the shrinkage and deformation rate of the finished product can be greatly reduced.
And (3) exhausting period: and (4) discharging high-pressure gas in the finished product after the finished product is shaped, and gradually reducing the gas pressure to atmospheric pressure.
Demoulding period: the finished product is ejected out of the film cavity.
Traditional gas needle structure is fixed gas needle, and at the gas-assisted injection moulding in-process, gas only can admit air and return air through the fit clearance between the gas needle. In order to prevent plastic melt adhesive from entering the air needle from the gap of the air needle nozzle to block the air needle in the stage of injection molding but not reaching air inlet, the gap size of the air needle needs to be designed to be very small and cannot be expanded, and the unilateral gap of the existing fixed air needle is about 0.02 mm.
The size of air needle clearance has directly decided the length of time of admitting air and returning air among the process of moulding plastics, and then has influenced whole gas and has assisted the process production cycle of moulding plastics, and in current gas assisted the cycle of moulding plastics, the length of time of admitting air and returning air has taken up than great proportion, and how to reduce the time of admitting air and returning air is the technical problem that needs to solve at present.
Disclosure of Invention
For the weak point of avoiding the background art, the utility model provides a mould gas needle is assisted to gas can increase the clearance of admitting air of gas needle, has improved the return air volume that admits air of unit interval, shortens the time of admitting air and returning air.
The utility model provides a gas-assisted mould gas needle, which comprises a gas joint, a fixed seat, an outer gas needle, an inner gas needle and a driving mechanism, wherein the outer gas needle is provided with a through hole, and one end of the outer gas needle is fixedly arranged on the fixed seat; the air joint is fixedly connected with the fixed seat; the fixed seat is integrally sealed, an air channel is arranged in the fixed seat, and two ends of the air channel are respectively communicated with the air joint and the outer air needle; one end of the inner air needle is positioned in the fixed seat, and the other end of the inner air needle penetrates through the through hole of the outer air needle; the driving mechanism is fixedly connected with the inner air needle and can drive the inner air needle to move in the outer air needle; when the inner air needle is positioned at a first limiting position, the inner air needle can seal an air outlet of the through hole of the outer air needle; when the inner air needle is located at the second limit position, the inner air needle does not close the air outlet of the through hole of the outer air needle.
Preferably, the driving mechanism comprises a driving cylinder, the driving cylinder is a double-acting driving cylinder, a piston rod of the driving cylinder is fixedly connected with the inner air needle, and the piston rod can drive the inner air needle to move up and down while moving up and down.
In another preferred mode, the driving mechanism comprises a driving cylinder, a moving seat and a compression spring, and the moving seat and the compression spring are arranged in the fixed seat; the inner air needle is fixed on the movable seat and moves up and down along with the movable seat; the compression spring is in a compressed state, one end of the compression spring is in contact with the inner bottom surface of the fixed seat, and the other end of the compression spring is in contact with the movable seat; the compression spring applies pressure to the moving seat to enable the moving seat to move downwards and drive the inner air needle to move downwards; the driving cylinder is a single-action type driving cylinder, and when the driving cylinder works, a piston rod of the driving cylinder applies pressure to the moving seat to enable the moving seat to move upwards and drive the inner air needle to move upwards. Optionally, the driving cylinder is a hydraulic cylinder, an air cylinder or an electric cylinder.
Preferably, the driving mechanism comprises a motor, a rotating shaft of the motor is fixedly connected with the inner air needle, and the rotating shaft can drive the inner air needle to rotate forward and backward while rotating forward and backward.
Preferably, the fixed seat comprises a first fixed seat and a second fixed seat which are fixed in a sealing and matching manner, and the driving mechanism is arranged in a cavity formed by the first fixed seat and the second fixed seat; the second fixing seat is internally provided with a medium channel, and the medium channel can pass through a driving medium for driving the driving mechanism; the driving mechanism is installed to seal and separate the cavity and the medium channel; the driving medium comprises liquid, gas and a lead.
Preferably, one end of the fixed seat is provided with a groove for placing one end of the inner air needle, the driving mechanism comprises a driving cylinder or a motor, a flange is arranged at the front end of the driving cylinder or the motor, and the flange is fixed with the fixed seat through a bolt and seals the groove of the fixed seat in a sealing manner.
The utility model discloses the gas-assisted equipment who still provides, include as above arbitrary one the gas-assisted mould gas needle.
The utility model has the advantages of improving the structure of the air needle, changing the air needle into a movable air needle, wherein the air needle comprises an outer air needle and an inner air needle, the inner air needle can move up and down to open or close the air inlet of the outer air needle, through the arrangement, plastic melt adhesive backflow is not needed to worry in the injection molding stage, the air inlet gap of the air needle can be set to be very large in the inflation stage, and the direct effect is that the air input and the air return amount in unit time are greatly improved, thereby shortening the air inlet time and the air return time; the final effect is to shorten the production cycle of the injection products, increase the production quantity of the injection products in unit time and generally reduce the production cost of a single injection product.
Drawings
FIG. 1 is a perspective view of an air pin of the air-assisted mold of the embodiment.
FIG. 2 is a schematic sectional view of the gas needle of the gas-assisted mold of the embodiment without air intake.
FIG. 3 is a schematic sectional view showing the structure of the air pin of the air-assisted mold according to the embodiment.
FIG. 4 is a schematic cross-sectional view of the outer gas needle in the gas needle of the gas-assisted mold according to the embodiment.
FIG. 5 is a schematic sectional view showing the structure of the inner gas pin of the gas-assisted mold according to the embodiment.
FIG. 6 is an enlarged view of the air pin of the air-assisted mold of the embodiment in cooperation with the outer air pin when the air pin is not in air.
FIG. 7 is an enlarged view of the air pin of the air-assisted mold of the embodiment in cooperation with the outer air pin and the inner air pin when air is supplied.
The reference numbers are as follows: 10-external air needle; 20-internal air needle; 30-outer needle positioning block; 40-outer needle sealing ring; 50-air needle fixing seat; 60-compression spring; 70-inner needle movable block; 80-hydraulic cylinder fixing seat; 90-hydraulic joint seal ring; 100-hydraulic joints; 110-hydraulic cylinder sealing ring; 120-hydraulic cylinder; 130-a hydraulic cylinder positioning block; 140-a stationary seat seal ring; 150-gas connection; 200-injection molding handle piece.
Detailed Description
The invention is further described with reference to the following drawings and specific examples.
In an embodiment, referring to fig. 1 to 7, a gas needle of a gas-assisted mold includes an outer gas needle 10, an inner gas needle 20, an outer needle positioning block 30, an outer needle sealing ring 40, a gas needle fixing seat 50, a compression spring 60, an inner needle movable block 70, a hydraulic cylinder fixing seat 80, a hydraulic joint sealing ring 90, a hydraulic joint 100, a hydraulic cylinder sealing ring 110, a hydraulic cylinder 120, a hydraulic cylinder positioning block 130, a fixing seat sealing ring 140, and a gas joint 150;
the air needle fixing seat 50 is provided with an upper groove and a lower groove, and a round hole for the inner air needle 20 to pass through is arranged between the upper groove and the lower groove; the upper end surface of the hydraulic cylinder fixing seat 80 is provided with a hydraulic groove, and the bottom surface of the hydraulic groove is also provided with a medium channel penetrating through the lower end surface of the hydraulic cylinder fixing seat 80; the hydraulic cylinder fixing seat 80 is fixedly connected with the air needle fixing seat 50 through bolts, and a fixing seat sealing ring 140 is arranged between the hydraulic cylinder fixing seat and the air needle fixing seat;
the outer air needle 10 is provided with a through hole 12 which penetrates through the outer air needle, the two ends of the through hole are respectively an air inlet end 11 and an air outlet end 13, and the inner diameter of the air outlet end 13 is smaller than that of the through hole 12; the air inlet end 11 of the outer air needle is arranged in an upper groove of the air needle fixing seat 50, an outer needle positioning block 30 penetrates through the outer air needle 10 to fixedly install the air inlet end 11 of the outer air needle in the upper groove of the air needle fixing seat 50, the outer needle positioning block 30 and the air needle fixing seat 50 are fixed through bolts, and an outer needle sealing ring 40 is arranged between the air inlet end 11 of the outer air needle and the air needle fixing seat 50;
the inner air needle 20 comprises a rear end 23, a rod body 22 and a front end 21, the outer diameter of the rod body of the inner air needle 20 is smaller than the inner diameter of the through hole 12 of the outer air needle, and the front end 21 and the rod body 22 of the inner air needle 20 penetrate into the through hole 12 of the outer air needle; the front end 21 of the inner air needle comprises a closed part 21a and a neck part 21b, the outer diameter of the neck part 21b is smaller than that of the closed part 21a, and the outer diameter of the closed part 21a is equal to the inner diameter of the air outlet end 13 of the outer air needle; the rear end 23 of the inner air needle is arranged in the lower groove of the air needle fixing seat 50, an inner needle movable block 70 and a compression spring 60 are also arranged in the lower groove of the air needle fixing seat 50, and the inner needle movable block 70 is fixedly connected with the rear end 23 of the inner air needle and can drive the inner air needle 20 to reset or move;
the air connector 150 is fixedly connected with the air needle fixing seat 50; the air needle fixing seat 50 is internally provided with an air channel, and two ends of the air channel are respectively connected with the air inlet end of the outer air needle 10 and the air connector 150;
a hydraulic cylinder 120 and a hydraulic cylinder positioning block 130 are arranged in a hydraulic groove of the hydraulic cylinder fixing seat 80, the lower end face of the air needle fixing seat 50 abuts against the hydraulic cylinder positioning block 130 so that the hydraulic cylinder positioning block 130 can further restrain and fix the hydraulic cylinder 120, and a hydraulic cylinder sealing ring 110 is arranged between the hydraulic cylinder 120 and the bottom face of the hydraulic groove; the lower end face of the hydraulic cylinder fixing seat 80 is provided with a hydraulic joint 100, the hydraulic cylinder fixing seat 80 is fixedly connected with the hydraulic joint 100 through a bolt, and a hydraulic joint sealing ring 90 is arranged between the hydraulic cylinder fixing seat 80 and the hydraulic joint 100; high pressure fluid may enter the cylinder 120 through the media path to operate the cylinder 120.
When the hydraulic cylinder 120 does not work, the compression spring 60 applies a downward force to the inner needle moving block 70 to push the inner needle moving block 70 to reset downwards, the inner needle moving block 70 drives the inner air needle 20 to reset, the closed part of the inner air needle 20 is located at the air outlet end of the outer air needle 10, and then the air outlet end of the outer air needle 10 is closed, as shown in fig. 6; when the hydraulic cylinder 120 is operated, the piston rod of the hydraulic cylinder 120 extends out to apply an upper pressure to the inner needle moving block 70 to push the inner needle moving block 70 to move upwards, the inner needle moving block 70 drives the inner air needle 20 to move, the neck of the inner air needle 20 is located at the air outlet end of the outer air needle 10, and then the air outlet end of the outer air needle 10 is opened, as shown in fig. 7.
The specific working principle of the gas needle of the gas-assisted mold in the embodiment is as follows:
in the early stage of injection molding, the air needle enters the inside of the injection molding handle piece 200, no pressure is output by hydraulic equipment externally connected to the hydraulic joint 100, namely no high-pressure oil enters the hydraulic cylinder 120, and the hydraulic cylinder 120 does not work; at this time, inside the air needle fixing seat 50, the compression spring 60 applies downward pressure to the inner needle moving block 70, the inner air needle 20 is driven by the inner needle moving block 70 to be in a reset state, the air outlet end of the outer air needle is sealed by the front end 21 of the inner air needle 11, and the plastic melt glue cannot enter the through hole 12 of the outer air needle, as shown in fig. 2;
when the injection molding amount of the plastic reaches a certain degree, entering an inflation period, wherein at the moment, high-pressure gas is firstly output by an air pressure device externally connected with the air joint 150 and enters the through hole 12 of the external air needle along the gas channel; high-pressure oil is output after hydraulic equipment externally connected to the hydraulic joint 100, the high-pressure oil enters the hydraulic cylinder 120 to enable the hydraulic cylinder 120 to work, a piston rod of the hydraulic cylinder 120 extends and applies upper pressure to the inner needle movable block 70, the upper pressure is larger than the lower pressure of the compression spring 60, the inner needle movable block 70 moves upwards, meanwhile, the inner air needle 20 is driven by the inner needle movable block 70 to move upwards, the air outlet end 11 of the outer air needle is not closed by the front end 21 of the inner air needle any more, high-pressure gas enters the injection molding handle piece 200 from a gap between the air outlet end 11 of the outer air needle and the neck 21b of the inner air needle 20, and the interior of a product is enabled to quickly form a cavity as shown in fig. 3;
after the inflation period and the pressure maintaining period, the exhaust period is started, at the moment, the air pressure device externally connected to the air joint 150 is deflated, and the high-pressure air inside the injection molding handle piece 200 returns back from the air needle gap. When the gas pressure inside the injection handle member 200 is reduced to atmospheric pressure, the hydraulic device externally connected to the hydraulic joint 100 does not output high-pressure oil any more, the upper pressure applied to the inner needle moving block 70 by the piston rod of the hydraulic cylinder 120 disappears, the lower pressure applied to the inner needle moving block 70 by the compression spring 60 causes the inner needle moving block 70 to move downward, meanwhile, the inner needle 20 is driven by the inner needle moving block 70 to move downward and enter a reset state again, and the gas outlet end 11 of the outer needle is re-closed by the front end 21 of the inner needle 20. Finally, the air needle is withdrawn from the injection molding handle piece 200, and the finished injection molding handle piece 200 starts to be demolded, wherein the demolding process is the same as that in the prior art, and the details are not repeated.
The gas needle of the gas-assisted mold can be used for any type of gas-assisted equipment, the main improvement point is the structure of the gas needle, the existing gas needle is a fixed gas needle, in order to prevent plastic melt glue from entering the gas needle from the gap of a gas needle nozzle in the injection molding stage to block the gas needle, the size of the gas inlet gap of the gas needle is small, and the gas inlet and return amount in unit time is limited. The air needle of the embodiment is a movable air needle, the air needle comprises an outer air needle 10 and an inner air needle 20, the inner air needle 20 can move up and down to open or close an air inlet of the outer air needle 10, through the arrangement, plastic melt glue backflow does not need to be worried about in the injection molding stage, and the air inlet gap of the air needle can be set to be very large in the inflation stage, so that the direct effect is that the air inflow and the air return amount in unit time are greatly improved, the air inlet time and the air return time are further shortened, and the actual use effect of an applicant is that the air inlet and air return time is reduced by 40% on the original basis; the final effect is to shorten the production cycle of the injection products, increase the production quantity of the injection products in unit time and generally reduce the production cost of a single injection product.
In addition, because the existing fixed air needle has a small air inlet gap size, in order to ensure that the air pressure in the injection molding product is maintained to a certain degree, the pressure of the high-pressure air output by the air auxiliary equipment is far greater than the air pressure in the injection molding product. After the movable gas needle is adopted in the embodiment, the gas inlet gap is increased, the pressure of high-pressure gas output by the gas auxiliary equipment can be greatly reduced, and the practical use effect of the applicant is that the pressure of the high-pressure gas output by the gas auxiliary equipment can be reduced to 80MPa from the original 200MPa, the load of the gas auxiliary equipment is effectively reduced, and the maintenance time of the equipment is prolonged.
The hydraulic cylinder 120 of the embodiment is preferably an oil cylinder, and other driving cylinders such as a hydraulic cylinder 120, an air cylinder or an electric cylinder with other media can be adopted instead of the oil cylinder.
The hydraulic cylinder 120 of this embodiment is a single-acting hydraulic cylinder 120, the hydraulic cylinder 120 drives the inner air needle 20 to move upward through the extended piston rod when operating, and the hydraulic cylinder 120 drives the inner air needle 20 to reset downward through the compression spring 60 when not operating; besides, a double-acting hydraulic cylinder 120 can be selected, a piston rod of the double-acting hydraulic cylinder 120 is fixedly connected with the rear end of the inner air needle 20, the upward movement or the downward reset of the inner air needle 20 is realized through the piston rod, and compared with the single-acting hydraulic cylinder 120, the double-acting hydraulic cylinder 120 can be adopted to omit the compression spring 60 and the inner needle movable block 70.
The hydraulic cylinder 120 of this embodiment is installed inside the hydraulic cylinder fixing seat 80, and in addition, the hydraulic cylinder 120 having a flange at the front end thereof may be adopted, and the flange is fixed to the air pin fixing seat 50 by a bolt and seals and closes the lower groove of the air pin fixing seat 50.
In the utility model, the movement mode of the inner air needle can be up and down movement or left and right rotation. The embodiment provides is a technical scheme that interior gas needle reciprocated motion for outer gas needle, in addition, can also adopt interior gas needle for outer gas needle rotary motion's technical scheme about, this kind of technical scheme accessible motor's axis of rotation drive interior gas needle is rotatory, the front end of interior gas needle and the end of giving vent to anger of outer gas needle need carry out the special construction cooperation, make the front end of interior gas needle seal the end of giving vent to anger of outer gas needle when interior gas needle resets, the front end of interior gas needle no longer seals the end of giving vent to anger of outer gas needle when interior gas needle is rotatory.
Although the present invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (8)
1. The utility model provides a mould gas needle is assisted to gas which characterized in that: comprises an air joint, a fixed seat, an external air needle, an internal air needle and a driving mechanism,
the outer air needle is provided with a through hole, and one end of the outer air needle is fixedly arranged on the fixed seat;
the air joint is fixedly connected with the fixed seat; the fixed seat is integrally sealed, an air channel is arranged in the fixed seat, and two ends of the air channel are respectively communicated with the air joint and the outer air needle;
one end of the inner air needle is positioned in the fixed seat, and the other end of the inner air needle penetrates through the through hole of the outer air needle;
the driving mechanism is fixedly connected with the inner air needle and can drive the inner air needle to move in the outer air needle; when the inner air needle is positioned at a first limiting position, the inner air needle can seal an air outlet of the through hole of the outer air needle; when the inner air needle is located at the second limit position, the inner air needle does not close the air outlet of the through hole of the outer air needle.
2. The gas-assisted mold gas needle of claim 1, wherein: the driving mechanism comprises a driving cylinder, the driving cylinder is a double-acting driving cylinder, a piston rod of the driving cylinder is fixedly connected with the inner air needle, and the piston rod can drive the inner air needle to move up and down while moving up and down.
3. The gas-assisted mold gas needle of claim 1, wherein: the driving mechanism comprises a driving cylinder, a moving seat and a compression spring, and the moving seat and the compression spring are arranged in the fixed seat; the inner air needle is fixed on the movable seat and moves up and down along with the movable seat;
the compression spring is in a compressed state, one end of the compression spring is in contact with the inner bottom surface of the fixed seat, and the other end of the compression spring is in contact with the movable seat; the compression spring applies pressure to the moving seat to enable the moving seat to move downwards and drive the inner air needle to move downwards; the driving cylinder is a single-action type driving cylinder, and when the driving cylinder works, a piston rod of the driving cylinder applies pressure to the moving seat to enable the moving seat to move upwards and drive the inner air needle to move upwards.
4. The gas-assisted mold gas needle according to any one of claims 2 or 3, wherein: the driving cylinder is a hydraulic cylinder, an air cylinder or an electric cylinder.
5. The gas-assisted mold gas needle of claim 1, wherein: the driving mechanism comprises a motor, a rotating shaft of the motor is fixedly connected with the inner air needle, and the rotating shaft can drive the inner air needle to rotate forwards and backwards while rotating forwards and backwards.
6. The gas-assisted mold gas needle of claim 1, wherein: the driving mechanism is arranged in a cavity formed by the first fixed seat and the second fixed seat; the second fixing seat is internally provided with a medium channel, and the medium channel can pass through a driving medium for driving the driving mechanism; the driving mechanism is installed to seal and separate the cavity and the medium channel; the driving medium comprises liquid, gas and a lead.
7. The gas-assisted mold gas needle of claim 1, wherein: the air needle sealing device is characterized in that one end of the fixing seat is provided with a groove for placing one end of the inner air needle, the driving mechanism comprises a driving cylinder or a motor, a flange plate is arranged at the front end head of the driving cylinder or the motor, and the flange plate is fixed with the fixing seat through a bolt and sealed with the groove of the fixing seat.
8. A gas-assisted device, characterized in that: comprising the gas-assisted mold gas needle of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023344670.5U CN214239405U (en) | 2020-12-31 | 2020-12-31 | Gas-assisted mold gas needle and gas-assisted device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023344670.5U CN214239405U (en) | 2020-12-31 | 2020-12-31 | Gas-assisted mold gas needle and gas-assisted device |
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| Publication Number | Publication Date |
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| CN214239405U true CN214239405U (en) | 2021-09-21 |
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| CN202023344670.5U Active CN214239405U (en) | 2020-12-31 | 2020-12-31 | Gas-assisted mold gas needle and gas-assisted device |
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- 2020-12-31 CN CN202023344670.5U patent/CN214239405U/en active Active
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