Large coiler mandrel for cold-rolled strip steel

Abstract

The invention discloses a large coiler mandrel for cold-rolled strip steel. The coiler mandrel comprises a pyramid shaft consisting of a transmission section and a pyramid section, wherein the periphery of the transmission section is sleeved with a gear hollow shaft; fan-shaped plates are uniformly distributed at the periphery of the pyramid section; the periphery of the end of the pyramid section is sleeved with a fan-shaped plate positioning sleeve; a mandrel pull rod is arranged in the pyramid shaft; one end of the mandrel pull rod is connected with a rotating expansion and contraction cylinder, and the other end of the mandrel pull rod is connected with the fan-shaped plate positioning sleeve; the fan-shaped plate positioning sleeve is connected with the fan-shaped plates and panel strips; the rotating expansion and contraction cylinder is arranged in an inner cavity at the tail end of the gear hollow shaft; an inner cavity at the head end of the gear hollow shaft and a corresponding part of the transmission section have a conical surface matched structure; and the gear hollow shaft and the transmission section are fixed through a connecting piece to form a whole. The technical problem that the mandrel has large radial runout because the pyramid shaft and the gear hollow shaft of the conventional mandrel are in clearance sliding fit can be solved, the rotational inertia of the mandrel is reduced, and dents are prevented from being formed on the surface of the strip steel due to a gap between adjacent fan-shaped plates when the mandrel is expanded.

Description

technical field [0001] The invention relates to a cold-rolled metal strip coiling device, in particular to a large-scale coiler for cold-rolled strip steel. Background technique [0002] With the increasingly wide application range of cold-rolled strip products, modern cold-rolled strip coiling equipment is developing towards the direction of large-scale high-speed, heavy-coil, and wide-slab width. The high-end cold-rolled sheet market represented by automobile car sheets and home appliance panels has put forward higher and higher requirements for the variety and quality of cold-rolled sheets, and the cold-rolled coiler reels directly related to sheets are also moving in a more precise direction develop. [0003] There are some deficiencies in the structure of the existing high-tension coiler reel, which are mainly manifested in: 1) the existing coiler reel adopts a larger external rotary expansion and contraction oil cylinder, which increases the moment of inertia of the r...

AI Technical Summary

Problems solved by technology

[0003] There are some deficiencies in the structure of the existing high-tension coiler reel, which are mainly manifested in: 1) the existing coiler reel adopts a larger external rotary expansion and contraction oil cylinder, which increases the moment of inertia of the reel , which affects the speed regulation and braking performance of the coiler, and the motion response sensitivity is insufficient in the highly automated rolling mill system; 2) The gap sliding fit is used between the hollow shaft and the pyramid shaft of the existing coiler drum, and the When running at high speed, the reel will inevitably produce a large radial runout, the dynamic balance performance of the reel is poor, and the speed of the reel is difficult to further increase; 3) For the rolling system with wide plate width and heavy coil weight, the current Some coiler reels are poor in pyramidal shaft strength and fan-shaped plate rigidity, and the coiled strip steel also has quality problems such as indentation

To sum up, the coiler reel with the existing structure can no longer meet the production requirements of large bearing capacity, high rotation precision and good coiling quality of cold-rolled strip steel

Images