Upper expansion sealing device for blow molding equipment

Abstract

The invention discloses an upper expansion sealing device for blow molding equipment. The upper expansion sealing device is arranged between a material stock forming die head and a mold closing deviceand comprises an upper sealing device which is installed below the material stock forming die head and opens and closes along the front side and the rear side, a material stock expansion device for extending and retracting along the left side and the right side is correspondingly arranged below the upper sealing device, and a material stock avoidance device is further installed at one end of thematerial stock expansion device; when a material stock of the material stock forming die head outpours, the bottom end of the material stock sleeves the material stock expansion device, when the material stock descends a certain height, the material stock expansion device extends in the direction of the left side and the right side, so that the bottom end of the material stock forms a long and thin shape in the left-right direction; and then the upper sealing device closes and clamps the lower end of the material stock from the direction of the left side and the right side, an opening of the lower end of the material stock is sealed, because the material stock is in the long and thin shape in the left-right direction at the moment, meanwhile, sealing is carried out in the direction of theleft side and the right side with the long and thin shape of the material stock, adhesion and wrinkles can be effectively prevented during material stock sealing in the prior art, and the molding rateof products is improved.

Description

technical field [0001] The invention belongs to the technical field of blow molding machines, in particular to an anti-wrinkle sealing device used on large-scale hollow blow molding equipment. Background technique [0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular preform obtained by extruding thermoplastic resin through the extrusion device is placed in the mold opening of the mold clamping device while it is hot or heated to a softened state. After the mold is closed, compressed air is injected into the parison to make the plastic mold The billet is inflated and clings to the inner wall of the mold, and after cooling and demolding, various hollow products can be obtained. [0003] The existing sealing devices are all arranged under the mold clamping device to seal the lower end of the tubular blank. This kind of sealing device located below the mold clamping device is called the lower sealing device. Th...

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Problems solved by technology

[0003] The existing sealing devices are all arranged under the mold clamping device for sealing the lower end of the tubular blank. This kind of sealing device located below the mold clamping device is called the lower sealing device. The lower sealing device has the following problems : 1. After the tubular blank is extruded from the blank forming die, when the blank reaches a predetermined length, the lower end of the blank is sealed by the lower sealing device, and then placed in the mold opening of the clamping device. After the mold is closed Compressed air is introduced, but due to the fast cooling rate of the tubular blank, when the blank is moved down for sealing and expansion, the shape of the basic material tube has been semi-finalized, which will seriously affect the sealing effect; 2. After the length of the blank reaches the predetermined length , the sealing is carried out, and at this time the billet is long and easy to flutter, and the sealing effect cannot be guaranteed accurately; 3. For some plate-shaped products, the shape of the traditional billet is generally tubular, and the lower end of the billet When sealing, make the bottom end form a flat seal, but when sealing, there is no auxiliary device, and the formed seal will have adhesion wrinkles, and for plate-shaped products such as desktop boards, it has higher requirements for sealing, such as forming adhesions Wrinkles form defective products, reducing yield

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