Flexible tightening head and tightening method

Abstract

The invention relates to a flexible tightening head and a tightening method, and belongs to the technical field of packaging machines. The problem that by means of an existing tightening device, metalexternally-threaded bottle covers, large in mass, poor in elastoplasticity, small in thread pitch and large in circle number, and internal threads of bottle bodies cannot be tightened is solved. Theflexible tightening head comprises an installation base body, telescopic rods and springs arranged on the telescopic rods in a sleeving manner. Reducing through holes used for upward and downward movement of the telescopic rods are formed in the installation base body. The longitudinal section of each reducing through hole is in a reversed-T shape. A working part matched with groove holes in the tops of the bottle covers is coaxially arranged at one end of each telescopic rod, and a limiting part used for limiting downward sliding of the telescopic rod is arranged at the other end of each telescopic rod. Each working part comprises a tip and a working cylinder. The diameter of the tips is smaller than or equal to the hole diameter of the groove holes. The diameter of the working cylindersis larger than the hole diameter of the groove holes and is smaller than or equal to the hole diameter of the lower portions of the reducing through holes. The flexible tightening head can provide large enough tightening torque to be suitable for automatic tightening of products with external threads, a tightening method is easy to operate, and cost is remarkably reduced.

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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