Mechanical expansion shaft of air control C-shaped rings

Abstract

The invention discloses a mechanical expansion shaft of air control C-shaped rings, which is used for metal and non-metal foil and a film-shaped coiled material and is suitable for production of an aluminium strip and foil. In order to solve the problem of compressibility of an expanded strip, no foundation in friction of an slope expansion block and low precision and structural strength in the existing gasbag type and slope-to-slope type mechanical expansion shaft, the invention provides a novel slope-to-round structure with automatically retracting capacity to replace the typical slope-to-slope old-fashioned structure; the novel slope-to-round structure comprises a main shaft pipe and an expansion mechanism; a plurality cone-shaped wedge pipes and a plurality of C-shaped rings are symmetrically sleeved on the expansion mechanism; and propulsion of the cone-shaped wedge pipes in opposite directions lead the C-shaped rings with a plurality of anti-skidding blades on the conical surface in a sleeving way to expand outward, so as to become secondary mechanical increasing force to tightly clamp a core rolling pipe. According to the invention, the slope-to-round structure is small in radial size, so that the strength of the expansion shaft is enhanced; the radial run-out error of the shaft is reduced due to disappearance of gaps between the blades and the shaft during the clamping; and the mechanical expansion shaft is applicable to the production for rolling thick pipe cores in wide roll width.

Description

technical field [0001] The invention relates to an air-controlled C-shaped ring mechanical expansion-shrinkage shaft, which belongs to the technical field of metal and non-metal foil and film-like coiled material processing shafts. Background technique [0002] In the processing of metal and non-metal foil, film-like coils, aluminum strips, and aluminum foils, the procedure for dividing large-width coils into finished coils of different widths is: first put the core tube on the take-up shaft, Then, the expansion shafts with different expansion methods and different shaft head structures are clamped between the rotating clamping shafts of the decoiler to complete uncoiling and coiling. [0003] At present, there are three types of winding shafts, one is that the core tube is worn on the solid shaft without expansion and contraction function, or there is a key on the end face of the core tube, and it is clamped with a nut. This kind of solid shaft improves the coiling accurac...

AI Technical Summary

Problems solved by technology

This kind of solid shaft improves the coiling accuracy by narrowing the gap with the core tube, so the processing cost of the core tube is high, and the reduction of the gap is contradictory to the lightness of the shaft. It is often used in thin core tubes, wide In the coiling work of heavy coils, the disadvantages are the poor coiling accuracy and the key on the end of the core tube, which is inconvenient for the adjustment and operation of the core tube.

[0005] The other one is the airbag expansion shaft with expansion and contraction function in traditional applications. Its advantage is that the core tube is easy to adjust and center. The disadvantage is that due to the compressibility of the gas, the coiled material during coiling will run out radially. , thus affecting the improvement of accuracy

There are 5 to 12 deep grooves on the circumference of the commonly used spindle tube to install the air bag, which reduces the strength of the shaft without coagulation, and increases its own weight. Suspension and pumping the shaft will cause the shaft to bend and deform, and there is also a shaft expansion force. Small, easy to slip, airbag leakage, expansion strip deformation and no retraction, etc.

[0006] In order to solve the shortcomings of the above two structures of the expansion shaft, a mechanical expansion and contraction shaft without a winding core end key has appeared in the prior art. The typical structure of slope to slope is used. The expansion force of the shaft of this type of structure depends on the size of the large end of each group of slope blocks and the consistency of the axial size of each set of matching long holes to be installed, so as to ensure that each slope block can be used. Participate in external expansion, which makes the processing cost high. In addition, the bevel block itself has no retraction function. Since there is a matching gap between the expansion core and the long spindle, the radial runout of the expansion shaft affects the improvement of the shaft accuracy.

Due to the large radial size of the inclined-plane expansion block, the design space of the central shaft diameter is compressed, which affects the improvement of the bending strength of the expansion shaft of this type of structure.

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