Plastic hollow container extruding and blowing machine

Abstract

The invention relates to a plastic hollow container extruding and blowing machine, which comprises a plasticizing system, a die head extrusion system and a blow molding system which are arranged on astander, wherein the blow molding system comprises an air blowing mechanism and a die opening and closing mechanism; the die opening and closing mechanism comprises a front template and a back template which are connected with each other through a pull rod; a die is arranged between the front template and a middle template, and the die comprises two die cavities; and a die opening and closing synchronization mechanism is arranged between the middle template and the back template. The plastic hollow container extruding and blowing machine is characterized in that the inner walls of the two diecavities are provided with material supporting rod grooves, a base is fixed under the die and is connected with a retaining plate through an up-down adjusting device, the retaining plate is provided with a hoist cylinder, a piston rod of the hoist cylinder is connected with a transverse plate, the transverse plate fixes a horizontal guide post through a left-right vertical plate which is providedwith a first expansion oil cylinder and a second expansion oil cylinder, the moving directions of two piston rods of the expansion oil cylinders are opposite to each other, the two piston rods fix a material supporting block which is provided with a material supporting rod matched with the material supporting rod grooves, the material supporting block is sleeved on the horizontal guide post, the middle part of the horizontal guide post is provided with a blowing pin fixing block which is provided with a blowing pin, and the blowing pin is matched with an air blowing hole at the bottom of the die.

Description

technical field [0001] The invention relates to a extrusion blow molding machine for plastic hollow containers, which is used for manufacturing large-scale products such as oil drums, highway guardrails, etc., and small-scale products such as mineral water bottles, beverage bottles, medicine bottles, cosmetic bottles, etc., belonging to the field of plastic machinery manufacturing. Background technique [0002] The plastic hollow extrusion blow molding machine is the main equipment for forming hollow containers. First, the extruder extrudes the molten plastic into the die, and extrudes the material tube through the die. The material tube is located between the two cavities of the mold, and the mold is closed. The blowing mechanism injects air into the barrel, the product is blown into shape, the mold is opened, and the product is taken out. However, the existing extrusion blowing machines have the following defects: first, for large products, especially products with Φ>50...

AI Technical Summary

Problems solved by technology

However, the existing extrusion blowing machines have the following defects: first, for large products, especially products with Φ>500mm or more, it is far from enough to rely on the blowing mechanism to blow air, resulting in insufficient expansion and difficult molding ;Secondly, according to the products with different geometric shapes, the die head makes the wall thickness of each part of the extrusion pipe different in size, that is, some parts need more material, and some parts need less material, so that the wall thickness can be blown out. For products with uniform thickness, when manufacturing large-scale products (such as oil barrels, highway guardrails, etc.), the storage tank type die head is generally used, but the positions of the core mold and the mouth die of the existing storage tank type die head are fixed. Therefore, the axial wall thickness of the material tube cannot be adjusted, and it is very easy to cause the wall thickness of the final product to be uneven due to the uncoordinated wall thickness of the material tube during the blowing process, and even cracks, resulting in many scrapped products and low molding efficiency; 3. The mold opening and closing mechanism of the existing extrusion blowing machine generally uses 4 tie rods to connect the front formwork, middle formwork and rear formwork, that is, the four corners of each formwork are blocked by tie rods. It is inconvenient to install the mold and take out the product. And the mold clamping cylinder drives the middle plate through the connecting rod mechanism, so the structure is complicated; fourth, the manipulator used to take out the product in the existing extrusion blowing machine is guided by a guide column, which has poor guiding performance and wear resistance, and because the left and right grippers of the manipulator There is no synchronization mechanism between them, and it is difficult to achieve synchronization and consistency of actions, resulting in unstable grasping

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