CN212194036U - Gas-assisted check valve structure of plastic mold - Google Patents
Gas-assisted check valve structure of plastic mold Download PDFInfo
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- CN212194036U CN212194036U CN202020330774.1U CN202020330774U CN212194036U CN 212194036 U CN212194036 U CN 212194036U CN 202020330774 U CN202020330774 U CN 202020330774U CN 212194036 U CN212194036 U CN 212194036U
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- hot runner
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- runner nozzle
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Abstract
The utility model provides a check valve structure is assisted to plastics mould's gas, which comprises a valve body, valve barrel and case, the valve body is installed and is set up the position at the discharge gate as the hot runner nozzle head in the hot runner nozzle main part, the discharge gate offsets the intercommunication with the mould cavity, the valve barrel sets up upper portion in the valve body, corresponding with hot runner nozzle runner, the case can set up in the valve body with reciprocating, be located the below of valve barrel, during the feeding, melting plastics passes through the case along hot runner nozzle runner and gets into the mould cavity, when moulding plastics the end, high-pressure nitrogen gas gets into the mould cavity, the case is pushed the rebound by melting plastics under the nitrogen pressure effect and is sealed with the valve barrel offsets, prevent nitrogen. The utility model discloses simple structure is reliable high-efficient, not only improves the surface reduction print defect that the local wall thickness of product caused, reduces die cavity pressure simultaneously, saves the injection moulding time, reduces the shaping cycle, to improving mould life and improving product surface defect, improves the product quality and has very big help.
Description
Technical Field
The utility model belongs to the technical field of the mould, a check valve structure is assisted to plastics mould's gas is related to.
Background
The nitrogen-assisted injection molding technology is increasingly used in modern plastic product design and production, so that on one hand, the mold structure can be simplified, the molding period can be shortened, the manufacturing and production cost can be reduced, on the other hand, the defects of product surface epitome and the like can be reduced, and the product surface quality can be improved.
When the nitrogen is used for assisting injection molding, the high pressure of the nitrogen requires that the whole injection molding cavity is a sealed space after the conventional injection of the mold is finished, namely, a flow channel between the injection molding machine and a product cavity is required to be cut off, so that the backflow of the high-pressure nitrogen is prevented, and the high-pressure nitrogen enters the charging barrel of the injection molding machine. The existing general method is that a side gate product drives a material sealing needle to seal air at a branch runner position by using a hydraulic control oil cylinder. If the material is directly fed onto the surface of a product, the material is difficult to arrange, the gas-assisted method is only abandoned, the material is stolen at the position of the material level on the back surface of the product to reduce the wall thickness, the injection molding requirement is met by changing the structure of the product, but the structure of the mold is complicated because the inside of the product is provided with an inverted buckle.
Therefore, the gas-assisted check valve structure of the plastic mold needs to be designed so as to meet the requirement of sealing of an injection molding material cavity during nitrogen-assisted injection molding.
Disclosure of Invention
The utility model aims to solve the technical problem that a simple structure, effectual plastic mold's of shaping gas-assisted check valve structure is provided to foretell technical current situation.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a check valve structure is assisted to plastic mold's gas, plastic mold includes mould cavity, hot runner nozzle main part and injection molding machine nozzle, its characterized in that: the gas-assisted check valve structure comprises a valve body, a valve sleeve and a valve core, wherein the valve body is arranged in a hot runner nozzle main body and is arranged at the position of a discharge port as a hot runner nozzle head, the discharge port is communicated with a mold cavity in a propping manner, the valve sleeve is arranged at the upper part in the valve body and corresponds to a hot runner nozzle flow passage, the valve core is arranged in the valve body in a vertically movable manner and is positioned below the valve sleeve, during feeding, molten plastic enters the mold cavity along the hot runner nozzle flow passage through the valve core, and when injection molding is finished and high-pressure nitrogen enters the mold cavity, the valve core is pushed by the molten plastic to move upwards under the action of the pressure of the.
As the improvement, the hot runner nozzle main body is a cylindrical structure with the bottom being in an inverted cone shape, the upper end of the valve body is fixed in the hot runner nozzle main body through threaded connection, and the lower end of the valve body is abutted to the inner wall of the inverted cone-shaped discharge hole.
And the middle part of the upper end of the hot runner nozzle main body is provided with a nozzle feed inlet, a nozzle of the injection molding machine is arranged right above the nozzle feed inlet, and the upper end of the nozzle feed inlet is provided with a positioning ring.
Furthermore, an annular groove is concavely arranged on the inner wall of the opening at the upper end of the valve body, a convex edge which is abutted against the annular groove is arranged at the upper end of the valve sleeve, the valve sleeve is embedded in the valve body, the upper part of the valve sleeve is coaxial with a hot runner nozzle flow passage, the inner diameter of the upper part of the valve sleeve is larger than that of the lower part of the valve sleeve, and the lower opening of the valve sleeve is in a diameter-expanded.
Furthermore, the valve core is provided with a circular ring structure which is abutted against the inner wall of the valve body, the lower inner wall of the valve body is provided with a limiting step for limiting the valve core, the valve core is arranged in the valve body and can be vertically and limitedly moved between the valve sleeve and the limiting step, the middle part of the upper end of the valve core is convexly provided with a conical structure matched with the lower opening of the valve sleeve, the upper end surface of the valve core penetrates through the outer side of the conical structure to form a plurality of round holes for molten plastic to pass through, and during feeding, the molten plastic enters the die cavity along the round holes of the valve core of the hot runner.
And finally, a nitrogen gas inlet valve is arranged on the mold cavity corresponding to the hollow position of the hollow product and is connected with a nitrogen gas inlet interface through a pipeline.
Compared with the prior art, the utility model has the advantages of: the original oil cylinder control link is omitted, the check valve is arranged in the hot runner nozzle main body, when injection molding is stopped after the preset volume is reached and high-pressure nitrogen enters a mold cavity, the valve core is pushed by molten plastic to move upwards under the action of nitrogen pressure to abut against the valve sleeve for sealing, and nitrogen is prevented from flowing back to the injection molding machine. The utility model discloses simple structure is reliable high-efficient, not only improves the surface reduction print defect that the local wall thickness of product caused, can reduce die cavity pressure simultaneously, saves the injection moulding time, reduces the shaping cycle, to improving mould life and improving product surface defect, improves the product quality and has very big help, the utility model discloses also can use in the large-scale mould of multiple spot.
Drawings
Fig. 1 is an exploded view of a check valve according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the check valve installed in a plastic mold;
FIG. 4 is an enlarged fragmentary view of area A of FIG. 2 with the spool in the down position;
fig. 5 is a partially enlarged view of the area a in fig. 2 when the spool floats.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 to 5, an air-assisted check valve structure of a plastic mold comprises a mold cavity 10, a hot runner nozzle body 4 and an injection molding machine nozzle 5, the air-assisted check valve structure comprises a valve body 1, a valve sleeve 2 and a valve core 31, the valve body 1 is arranged in the hot runner nozzle body 4 and is used as a hot runner nozzle head to be arranged at a discharge port, the discharge port is abutted against and communicated with the mold cavity 10, the valve sleeve 2 is arranged at the upper part in the valve body 1 and corresponds to a hot runner nozzle runner 42, the valve core 3 is arranged in the valve body 1 and is positioned below the valve sleeve 2 in a manner of moving up and down, molten plastic enters the mold cavity 10 through the core 3 along the hot runner nozzle runner 42, when the injection molding is finished and high-pressure nitrogen enters the mold cavity 10, the valve core 3 is pushed by the molten plastic to move upwards under the action of the nitrogen pressure to abut against the valve sleeve 2 for sealing, and the nitrogen is prevented from flowing back to the injection molding machine.
The concrete structure is as follows: the hot runner nozzle body 4 is of a cylindrical structure with the bottom part being in an inverted cone shape, a nozzle feeding hole 41 is formed in the middle of the upper end of the hot runner nozzle body 4, the injection molding machine nozzle 5 is arranged right above the nozzle feeding hole 41, and a positioning ring 6 is arranged at the upper end of the nozzle feeding hole 41. The upper end of the valve body 1 is fixed in the hot runner nozzle body 4 through threaded connection, and the lower end of the valve body 1 is abutted against the inner wall of the inverted cone-shaped discharge hole. An annular groove 11 is concavely arranged on the inner wall of an opening at the upper end of the valve body 1, a convex edge which is abutted against the annular groove 11 is arranged at the upper end of the valve sleeve 2, the valve sleeve 2 is embedded in the valve body 1, the upper part of the valve sleeve 2 is coaxial with a hot runner nozzle flow passage 42, the inner diameter of the upper part of the valve sleeve 2 is larger than that of the lower part of the valve sleeve 2, and the lower opening of the valve sleeve 2 is in. The valve core 3 has a circular ring structure which is abutted against the inner wall of the valve body 1, the lower inner wall of the valve body 3 is provided with a limiting step 12 for limiting the valve core 3, the valve core 3 is arranged in the valve body 1 and can be vertically positioned between the valve sleeve 2 and the limiting step 12 in a limiting movement mode, the middle part of the upper end of the valve core 3 is convexly provided with a conical structure 31 matched with the lower opening of the valve sleeve 2, the upper end surface of the valve core 3 is annularly penetrated through a plurality of small circular holes 32 for molten plastic to pass through around the outer side of the conical structure 31, and during feeding, the molten plastic enters the mold cavity 10 through the small circular holes 32 of the valve core 3 along the hot runner nozzle. And a nitrogen gas inlet valve 8 is arranged on the mold cavity 10 corresponding to the hollow position of the hollow product 7, and the nitrogen gas inlet valve 8 is connected with a nitrogen gas inlet port 9 through a pipeline.
The specific operation process is as follows: during feeding, a nozzle 5 of the injection molding machine moves downwards to be aligned with a feeding port 41 of a hot runner nozzle, molten plastic enters a mold cavity 10 through a small circular hole of a valve core 3 of a check valve along a hot runner nozzle runner 42 and stops injection molding after reaching a preset capacity, high-pressure nitrogen enters the mold cavity 10 through a nitrogen inlet valve 8 along a nitrogen inlet interface 9, the molten material pushes the valve core 3 to float upwards to jack a valve sleeve 2 for sealing under the action of nitrogen pressure, nitrogen is prevented from flowing back to the injection molding machine, the product is smoothly formed with uniform wall thickness, an oil cylinder control link is omitted in the embodiment, and injection molding time can be saved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a check valve structure is assisted to plastic mold's gas, plastic mold includes mould cavity, hot runner nozzle main part and injection molding machine nozzle, its characterized in that: the gas-assisted check valve structure comprises a valve body, a valve sleeve and a valve core, wherein the valve body is arranged in a hot runner nozzle main body and is arranged at the position of a discharge port as a hot runner nozzle head, the discharge port is communicated with a mold cavity in a propping manner, the valve sleeve is arranged at the upper part in the valve body and corresponds to a hot runner nozzle flow passage, the valve core is arranged in the valve body in a vertically movable manner and is positioned below the valve sleeve, during feeding, molten plastic enters the mold cavity along the hot runner nozzle flow passage through the valve core, and when injection molding is finished and high-pressure nitrogen enters the mold cavity, the valve core is pushed by the molten plastic to move upwards under the action of the pressure of the.
2. The gas-assisted check valve structure of claim 1, wherein: the hot runner nozzle main part is the cylindric structure of bottom for the back taper, and threaded connection is passed through in the hot runner nozzle main part in the upper end of valve body, and the lower extreme of valve body offsets with the inner wall of back taper discharge gate.
3. The gas-assisted check valve structure of claim 2, wherein: the hot runner nozzle is characterized in that a nozzle feeding hole is formed in the middle of the upper end of the hot runner nozzle body, a nozzle of an injection molding machine is arranged right above the nozzle feeding hole, and a positioning ring is arranged at the upper end of the nozzle feeding hole.
4. The gas-assisted check valve structure of claim 3, wherein: the inner wall of an opening at the upper end of the valve body is concavely provided with an annular groove, the upper end of the valve sleeve is provided with a convex edge which is abutted against the annular groove, the valve sleeve is embedded in the valve body, the upper part of the valve sleeve is coaxial with a hot runner nozzle flow passage, the inner diameter of the upper part of the valve sleeve is larger than that of the lower part of the valve sleeve, and the lower opening of the valve sleeve is in an expanded conical.
5. The gas-assisted check valve structure of claim 4, wherein: the valve core is provided with a circular ring structure which is abutted against the inner wall of the valve body, the lower inner wall of the valve body is provided with a limiting step for limiting the valve core, the valve core is arranged in the valve body and can be vertically and limitedly moved between the valve sleeve and the limiting step, the middle part of the upper end of the valve core is convexly provided with a conical structure matched with the lower opening of the valve sleeve, the upper end surface of the valve core penetrates through a plurality of round holes for molten plastic to pass through around the outer side of the conical structure, and during feeding, the molten plastic enters the die cavity through the round holes of the valve core along the hot runner.
6. The gas-assisted check valve structure of any one of claims 1 to 5, wherein: and a nitrogen gas inlet valve is arranged on the mold cavity corresponding to the hollow position of the hollow product and is connected with a nitrogen gas inlet connector through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020330774.1U CN212194036U (en) | 2020-03-16 | 2020-03-16 | Gas-assisted check valve structure of plastic mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020330774.1U CN212194036U (en) | 2020-03-16 | 2020-03-16 | Gas-assisted check valve structure of plastic mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212194036U true CN212194036U (en) | 2020-12-22 |
Family
ID=73822923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020330774.1U Active CN212194036U (en) | 2020-03-16 | 2020-03-16 | Gas-assisted check valve structure of plastic mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212194036U (en) |
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2020
- 2020-03-16 CN CN202020330774.1U patent/CN212194036U/en active Active
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