Fast mold opening and closing oil cylinder structure of plastic product forming machine

Abstract

The invention discloses a fast mold opening and closing oil cylinder structure of a plastic product forming machine. The fast mold opening and closing oil cylinder structure comprises a machine frame; the machine frame comprises a pair of left mold base guide rails, a pair of right mold base guide rails, a left mold base, a right mold base, a pair of oil cylinder frame guide rails, an oil cylinder frame and a pair of lower pull rods. The fast mold opening and closing oil cylinder structure further comprises an oil cylinder, a large piston rod, a small piston rod and a control mechanism; the oil cylinder comprises an oil cylinder sleeve, a left oil cylinder end cover and a right oil cylinder end cover. The fast mold opening and closing oil cylinder structure is characterized by further comprising an oil storage tank arranged at the upper part of the machine frame; the outer wall of the left end of the small piston rod placed inside a small piston rod containing cavity is matched with the cavity wall of the small piston rod containing cavity; when hydraulic oil is guided into a large piston rod inner oil cavity, the large piston rod moves leftwards and drives the right mold base to move leftwards and the left mold base and the oil cylinder frame to move rightwards, the left mold base and the right mold base do the mold-closing motion, when the left mold base and the right mold base lock molds, high-pressure oil is guided into a right cylinder cavity by an oil pipe connector of the right oil cylinder end cover, and a small piston rod oil way oil inlet and return port keeps guiding the hydraulic oil into the large piston rod inner oil cavity. According to the structure, the manufacturing difficulty is lowered, and the mold closing speed is increased.

Description

technical field [0001] The invention belongs to the technical field of plastic product forming machinery, and in particular relates to a quick mold opening and closing oil cylinder structure of a plastic product forming machine. Background technique [0002] The plastic products mentioned above mainly refer to but are not absolutely limited to hollow plastic products, such as various plastic containers, palletizing barrels and even trays (trays such as CN102407967B, CN103253442A and CN102009774B), etc. [0003] As known in the industry, every time a plastic product molding machine molds a product, it needs to perform a mold opening and closing action. For this, please refer to CN101890772B (mold opening and closing mechanism), CN101890805B (magnetic mold clamping device for hollow plastic product molding machine), CN102357948A (Elbow type mold opening and closing mechanism), CN102848558B (mold clamping device for hollow plastic product molding machine), CN103522528B (horizon...

AI Technical Summary

Problems solved by technology

[0007] Because the above-mentioned CN104196813A adopts the outer cylinder and the inner cylinder, it not only has a complicated structure, but also has a large volume, which is not conducive to the application on the plastic product molding machine with a strict structure; since the above-mentioned CN104653542A is designed for the plastic product molding machine, objectively It can realize the technical effect recorded in paragraph 0005 of its specification, but it has the following shortcomings: First, the Chinese character " Convex "shaped structure, so processing is difficult; second, because the large piston rod (patent called piston rod) only slides and fits between the inner wall of the piston area at its base and the inner wall of the small piston rod, while other areas of the large piston rod That is to say, the inner diameter of the piston oil cylinder mentioned in the patent is significantly larger than the outer diameter of the small piston rod to form a larger piston oil chamber, so on the one hand, the large volume of the piston oil chamber is not enough to push the large hydraulic oil in the case of small flow rate. The expected effect of the piston rod and the rapid displacement of the large piston rod still affects the speed of mold opening and closing. On the other hand, the movement stability of the large piston rod is also affected accordingly; It can be seen from the description and combined with the illustrations that since the cylinder cavity (patent called the cylinder back cavity) does not have a thrust effect on the large piston rod during mold clamping, the locking is achieved only by the pressure oil in the oil chamber of the large piston rod when clamping the mold. mold, so the clamping force is fragile, and the quality of the clamping effect will affect the molding quality of plastic products to a large extent; Fourth, the patent does not provide the valve structure for controlling the inlet and outlet ports and the relationship with the valve structure. The enlightenment of the oil pipe pipeline structure connected to the oil inlet and the oil return port, but these technical elements are just an important factor that cannot be neglected to ensure the operation or reliability of the rapid opening and closing mold cylinder.

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