Toggle rod overturning mold clamping mechanism and injection molding machine

Abstract

The invention relates to a toggle rod overturning mold clamping mechanism which comprises a fixed template, a movable template, a tail plate and a push plate. A pull rod is arranged between the fixedtemplate and the tail plate. The toggle rod overturning mold clamping mechanism further comprises a front toggle rod, a first back toggle rod, a second back toggle rod and a connecting toggle rod. Oneends of the back toggle rod and the second back toggle rod are hinged to the tail plate while the other ends of the back toggle rod and the second back toggle rod are hinged to one end of the front toggle rod, the other end of the front toggle rod is hinged to a movable template, a hinge hole is formed in the push plate, one end of the connecting toggle rod is connected to the push plate througha hinge shaft arranged on the hinge hole, and the other end of the connecting toggle rod is separately hinged to the first back toggle rod and the second back toggle rod, separately. A guide bar is arranged on the tail plate, guide holes are formed in two sides of the push plate, and the guide bar penetrates the guide holes. The push plate of the mold clamping mechanism is not guided by four pullrods but is guided by the guide bar on the tail plate. The action force of the small toggle rod to the push plate is transferred by means of a shaft of the hinge point, so that bending moment action to the push plate is avoided, and therefore, the risk that the push plate is broken to lose effect as a result of too large bending moment is eliminated.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to a toggle lever eversion type clamping mechanism and an injection molding machine. Background technique [0002] The clamping mechanism is an important part of the plastic injection molding machine, and functions such as mold installation, opening and closing, and product ejection are all realized by it. The toggle clamping mechanism occupies most of the plastic injection molding machine market due to its reliable performance and low cost. Among them, the toggle clamping mechanism (that is, the toggle is turned inside the mechanism when the mold is opened) is the main one. , while the toggle clamping mechanism (that is, the toggle is turned to the outside of the mechanism when the mold is opened) has been difficult to be accepted by the market due to the difficulty in the design of the push plate, and it is easy to withstand large bending moments and fail. There are ver...

AI Technical Summary

Problems solved by technology

The toggle clamping mechanism occupies most of the plastic injection molding machine market due to its reliable performance and low cost. Among them, the toggle clamping mechanism (that is, the toggle is turned inside the mechanism when the mold is opened) is the main one. , while the toggle clamping mechanism (that is, the toggle is turned to the outside of the mechanism when the mold is opened) has been difficult to be accepted by the market due to the difficulty in the design of the push plate, and it is easy to withstand large bending moments and fail. There are very few of them, and the push plate structure is mostly designed as a four-frame formwork structure. Due to the complex structure, it can only be produced by casting. The material is cast iron or cast steel. Like the moving formwork, it uses four tie rods for guidance. The structure is heavy and the cost is high. And because four pull rods are used for guidance, when the high-pressure mold is clamped, the thrust of the small toggle on the upper and lower side beams of the push plate can easily form a large bending moment, so the push plate is easy to break and fail

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