A flexible tightening head and tightening method

Abstract

The invention relates to a flexible tightening head and a tightening method, belonging to the technical field of packaging machinery, which solves the problem that the existing tightening device cannot meet the requirements of tightening the metal external threaded bottle cap and the inner thread of the bottle with large quality, poor elastic-plasticity, small pitch and many turns. The problem. The flexible tightening head includes a mounting base, a telescopic rod, and a spring sleeved on the telescopic rod. The mounting base is provided with a variable-diameter through hole for the telescopic rod to move up and down. The longitudinal section of the variable-diameter through hole is convex; one end of the telescopic rod There is a working part coaxial with the slot on the top of the bottle cap, and the other end is provided with a limiting part for limiting the downward sliding of the telescopic rod; the working part includes a terminal and a working cylinder, and the diameter of the terminal is smaller than or equal to the diameter of the slot. The diameter of the working cylinder is larger than the aperture of the slot hole and smaller than or equal to the lower aperture of the variable diameter through hole. The flexible tightening head of the invention can provide sufficient tightening torque to adapt to the automatic tightening of products with external threads, and the tightening method is easy to operate and significantly reduces the cost.

Description

technical field [0001] The invention relates to the technical field of packaging machinery, in particular to a flexible tightening head and a tightening method. Background technique [0002] At present, there are mature bottle cap tightening equipment, which can realize automatic tightening between plastic bottle caps and plastic bottle bodies, between metal bottle caps and glass bottle bodies, and its product features are: [0003] 1) The quality of the bottle cap is small, and the material is mostly plastic or metal material with good elasticity and plasticity; [0004] 2) The thread of the bottle cap is mainly internal thread, and the thread of the bottle body is mainly external thread; [0005] 3) The pitch of the thread is generally 2 to 3 mm, and the number of turns is generally 2 to 3 turns; [0006] The tightening torque required in such cases is usually small, and the tightening principle is mainly through the contact between the tightening head and the upper surf...

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Problems solved by technology

[0008] In view of the above analysis, the present invention aims to provide a flexible tightening head and a tightening method to solve the problem that existing tightening devices cannot meet the needs of metal external thread bottle caps and bottle bodies with large mass, poor elastic-plasticity, small pitch, and many turns. thread tightening problem

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