Tire building machine belt layer drum and radial expansion and contraction method thereof

Abstract

The invention relates to a tire building machine belt layer drum and a radial expansion and contraction method thereof. A servo motor is adopted as an axial driving device; with motion mode conversion, drum tile radial expansion and contraction changes are caused with a mechanical transmission mode, such that the radial expansion and contraction distance of each drum tile can be precisely controlled. Therefore, belt layer drum diameter range adjustment precision can be improved. The belt layer drum radial expansion and contraction method comprises the steps that: at least a set of drum tiles which can be radially expanded and contracted, and a conical sleeve which can be subjected to synchronous axial rotation with the drum tiles are radially sleeved on a main shaft of the belt layer drum. A thrust device driven by the servo motor is axially arranged along the main shaft. The thrust device comprises a first push rod laterally connected with the conical sleeve. The first push rod rotates synchronically under the driving of the conical sleeve, such that the first push rod can push and pull the conical sleeve along an axial direction, and drum tile radial expansion and contraction can be realized.

Description

technical field [0001] The invention relates to a belt layer drum of a molding machine for preparing rubber tires and a radial expansion and contraction method thereof, belonging to the field of rubber machinery. Background technique [0002] Based on the existing rubber tire preparation process, the forming machine for tire blank processing usually needs to be separately equipped with a belt drum for preparing the belt layer-tread assembly, so that the belt layer and / or tread rubber and other components are made Formed into a monolithic structure in the shape of a ring, it is then transported by the belt transfer ring to the forming drum for further processing. [0003] In the process of preparing the belt-tread assembly, the composite parts are sequentially superimposed on the surface of the drum shoes of the belt layer drum, and the composite parts are bonded by the expansion and contraction of the drum shoes in the radial direction. [0004] For example, the prior paten...

AI Technical Summary

Problems solved by technology

Due to the use of a pneumatic drive device, it is difficult to accurately control the process distance generated by the compressed air, that is, it is difficult to accurately control the radial movement distance of the support 2, usually after a long period of use due to the decline in the sealing performance of the air circuit, such problems are more serious to be significant

[0007] Moreover, the pressure difference of the local compressed air will also directly cause the radial drop between several supports 2, which will affect the surface smoothness of the so-called rigid support surface T, and it is easy to produce internal friction when the belt layer-tread assembly is bonded. Air bubbles will affect the quality of subsequent tire blank molding, and bring safety hazards to the actual use of tires

[0008] In addition, stoppers are attached to the ends of the rods 35, 31, etc., although they can play an axial positioning role for the conical parts, etc., but combined with the above-mentioned pneumatic drive device, the internal structure of the drum is too complicated, and installation and debugging and maintenance are more cumbersome

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