Locking and unlocking device for side mold frame of bottle blowing machine

Abstract

The invention relates to an unlocking and locking device for a side mold frame of a bottle blowing machine. The unlocking and locking device comprises a movable buckle movably connected with the side mold frame, a fixed buckle fixedly connected with the side mold frame and a motion conversion mechanism. The movable buckle moves up and down relative to the side mold frame in the axis direction of a side mold frame opening and closing rotating shaft. A plurality of meshing grooves are evenly distributed in the fixed buckle and the movable buckle in the axis direction of the side mold frame opening and closing rotating shaft. When teeth of the movable buckle are meshed with teeth of the fixed buckle, locking is achieved. When the teeth of the movable buckle / fixed buckle are located in the grooves of the fixed buckle / movable buckle, the movable buckle is disengaged from the fixed buckle, and unlocking is achieved. The motion conversion mechanism is composed of a swing cam and two rollers arranged on the lower portion of the movable buckle, a flange is arranged on a cylinder of the swing cam, and swing of the cam is converted into movement of the movable buckle through the contact between the two side faces of the flange of the cam and the two rollers arranged on the lower portion of the movable buckle. The device has the advantages of being simple in structure, reliable in work, convenient to manufacture and install, capable of achieving zero-clearance locking of the two split side molds of a plastic container and the like.

Description

technical field [0001] The invention relates to the technical field of bottle blowing machines, in particular to an opening and closing device for side mold frames of a rotary bottle blowing machine. Background technique [0002] The molding module used to form plastic blanks into plastic containers on the rotary blow molding machine includes: the frame and the opening and closing mold rotation axis A installed on the frame, which can be wound separately or at least one of them can be wound around the frame. The two side formworks that rotate on the axis A, the bottom formwork that can move along the axial direction of the axis A on the frame, and the two split side molds of the plastic container supported by the two side formworks and the bottom formwork Bottom molds for supported plastic containers, etc. The two side mold bases and the bottom mold base are closed, so that the two split side molds and the bottom mold of the plastic container can form a hollow cavity, and t...

AI Technical Summary

Problems solved by technology

Existing embodiments of this technical solution adopt a structure in which the fixed claw buckle faces outward and the movable claw buckle faces inward, which has the following defects: (1) The centrifugal inertial force of the movable claw faces the direction of the two claws to release. In the process, the two claws can be effectively interlocked, and a large reverse holding torque must be exerted on the movable claw; (2) when the surface of the movable claw and the fixed claw are contaminated with oil, it is easy to trip, causing serious accidents; (3) the movable claw The locking process is difficult to control, and it is prone to shock and noise

But all there is an obvious defect in above-mentioned three kinds of technical schemes: there is gap between two split bottle blow molds under the locked state, in order to eliminate this gap, a split blow bottle mold must be flexibly connected with side formwork, and both The closed air chamber must be designed and manufactured. When the opening and closing mechanism is locked and the two side mold frames cannot rotate relative to each other, high-pressure gas is input into the airtight air chamber to drive the split blowing mold that is movably connected with the side mold frame. Move and compress another split blow mold to eliminate gaps

Obviously, the cost of eliminating the gap between the two split molds through the above technical solution is relatively high: (1) The manufacturing precision of the airtight air chamber is high, and a high-priced sealing ring is required to maintain the airtightness of the air chamber; (2) The introduction and discharge of high-pressure gas Need expensive high-pressure solenoid valve; (3) need to consume high-pressure gas during operation

Not only increases the manufacturing cost of the blow molding machine, but also increases the operating cost of the blow molding machine

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