Air blowing pre-ventilation device of injection blowing molding machine

A technology of blowing pre-passing and forming machine, applied in the field of thermoplastic molding, can solve the problems of easy bursting and deformation of products, difficult opening of air vents, long action cycle, etc., and achieve the effects of simple structure, short exhaust time and long service life

Active Publication Date: 2013-01-30
ZHEJIANG SHUOKANG PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is necessary to blow air to the blow mold, the piston moves to push the rod to move, and overcomes the elastic force of the spring and drives the mandrel to move to open the vent. For blow molding, since the air pressure of the injection blow molding machine in the cylinder is the same as the air pressure of the high-pressure gas injected at the intake end, when the air pressure of the high-pressure gas in the blow mold is close to the air pressure in the cylinder , under the action of the spring force, the pole is pushed to move, and the vent is blocked by the mandrel. At this time, even if the vent end stops the air intake, because the vent is blocked, the high-pressure gas in the blow mold acts on the mandrel, and at the same time The push piston cannot move in the direction of the rod, which makes it difficult to open the vent. Only when the gas leakage pressure in the product is reduced, the mold vent can be opened and exhausted completely. This requires a long cycle of action, and the exhaust is not complete. The product is easy to burst and deform

Method used

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  • Air blowing pre-ventilation device of injection blowing molding machine

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, a blowing pre-passing device for an injection-blow hollow molding machine includes a double-diameter cylinder 1, and the double-diameter cylinder 1 includes a cylinder body 1a. The diameter of body one 1b is twice the diameter of cavity two 1c. Cavity one 1b and cavity two 1c are provided with matching piston one 2 and piston two 3 respectively, and the outside of piston two 3 communicates with the outside of cylinder 1a. The inner wall of cavity one 1b is provided with an annular groove one 1b1, and a sealing ring one 5 is embedded in the annular groove one 1b1; the inner wall of cavity two 1c is provided with an annular groove two 1c1, and a sealing ring is embedded in the annular groove two 1c1 Circle two 6. The side of the piston-2 is in contact with the sealing ring-5 to form a seal. When the piston-2 moves, the inner wall of the cavity-1b of the cylinder 1a does not wear, so that the cylinder 1a can have a longer service life. The si...

Embodiment 2

[0034] The structure and principle of this embodiment are basically the same as that of Embodiment 1, the difference is that: figure 2 and 3 As shown, the blowing pre-passing device also includes a strip-shaped linkage top plate 4, the two ends of the linkage top plate 4 are provided with parallel and dual-diameter cylinders 1 arranged in the same direction, and the sides of the double-diameter cylinders 1 are provided with supply The groove 1f through which the linkage top plate 4 passes, and the groove 1f communicates with the cavity 2 1c. The same side wall of the linkage top plate 4 all leans against the corresponding piston 2 3 . Two double-diameter cylinders 1 are arranged at both ends of the linkage top plate 4, so that the linkage top plate 4 can simultaneously pre-pass the vents 8a of multiple blow molds, so that the injection-blow hollow molding machine can be installed with multiple blow molds. Simultaneous production improves work efficiency; the two ends of the...

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PUM

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Abstract

The invention provides an air blowing pre-ventilation device of an injection blowing molding machine, which belongs to the technical field of thermoplastic molding, and solves the problem that the exhausting of the existing air blowing pre-ventilation device of the injection blowing molding machine is not complete, and thus a product is easy to crack and deform. The air blowing pre-ventilation device provided by the invention comprises a double-diameter air cylinder comprising a cylinder body; the cylinder body is provided with a cavity I and a cavity II, which are communicated with each other; the diameter of the cavity I is more than that of the cavity II; the cavity I and the cavity II are internally and respectively provided with a piston I and a piston II, which are respectively matched with the cavity I and the cavity II; and the outer side of the piston II is communicated with the outer side of the cylinder body. The air blowing pre-ventilation device of the injection blowing molding machine has the advantages of short air exhausting time and more complete air exhaustion.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic molding, and relates to an air blowing pre-passing device, in particular to an air blowing pre-passing device for an injection-blow hollow molding machine. Background technique [0002] Injection blow molding machine is a kind of equipment that makes plastic particles into hollow containers through injection blow molding process. The specific working process is as follows: inject molten material into the injection mold to form a parison, and then place the parison in the blow mold , using compressed air to inflate the parison in the blow mold into a product. During blow molding, the device that opens the vent of the blow mold is called a pre-blowing device, which is used for the air intake during blow molding and the exhaust after blow molding. [0003] The air inlet end of the blow molding mold is cylindrical, one end of which is a mold vent, and a spring and a strut are arranged in the ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/42
Inventor 娄福新
Owner ZHEJIANG SHUOKANG PACKING
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