Automatic descaling and sealing device of pull rod of short-stress rolling mill

Abstract

The invention belongs to the field of sealing of rolling mills, and particularly discloses an automatic descaling and sealing device of a pull rod of a short-stress rolling mill. The automatic descaling and sealing device comprises a sealing base and a sealing cover, wherein the sealing base is annular; a first fixing device is arranged on the sealing base; sealing end faces for cooperative sealing of the sealing cover and the sealing base are conical surfaces or spherical surfaces; a first sealing ring is arranged on the sealing end face of the sealing cover; a second sealing ring is arrangedon the inner ring surface of the sealing cover; at least one scraping knife is arranged on the outer end face of the sealing cover; and a second fixing device is arranged on the sealing base and thesealing cover. According to the automatic descaling and sealing device, the sealing base and the sealing cover are arranged, the structure is simple, and manufacturing and utilization are convenient;the pull rod is effectively sealed through the sealing rings in two different positions; the sealing end faces of the sealing base and the sealing cover are conical surfaces or spherical surfaces, sothat the automatic descaling and sealing device is not affected by processing and mounting precision of a roll box and deviation of the stress state of the pull rod; and the scraping knives can removedirt on the outer contour of the pull rod.

Description

technical field [0001] The invention belongs to the field of rolling mill sealing, and relates to a sealing device for a rolling mill tie rod, in particular to a self-cleaning sealing device for a short stress rolling mill tie rod. Background technique [0002] At present, in order to improve the precision of rolled products, all rolling mills in domestic and foreign steel mills usually adopt high-rigidity rolling equipment, such as various short-stress rolling mills that are currently popular. Their common feature is that there are as few stressed parts as possible during rolling, and the path of the stressed circuit is as short as possible, so as to improve the deformation resistance of the stressed material and enhance the rigidity of the equipment. Nowadays, in order to reduce the stress path of this type of equipment, each company uses the most direct high-rigidity tie rod to withstand the rolling force, but because a section of the tie rod is exposed to the outside whe...

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Problems solved by technology

Therefore, the problem caused by poor sealing here has become one of the biggest equipment hidden dangers of the main machine of the production line

[0008] The second type of sealing structure, compared with the first type of single dust-proof sealing structure, has a certain improvement. Considering the increase of the sealing area to enhance the waterproof and dustproof function of the protective sleeve, an "O" ring is added inside to seal it. Due to the actual processing error of the roller box and some shape and position deviations of the four roller boxes when assembling a complete set, the sealing and matching conditions of the four sets of tie rods and the roller box are far from the ideal matching state required by the design. After the force is applied, there is a certain deflection in the local gap value of the seal, so that all the sealing rings will have a large amount of compression on one side and a small amount on the other side or no contact at all. If the design is to solve this phenomenon, the protective sleeve and the sealing ring will be enlarged If the amount of compression is too high, the friction torque will increase sharply, making it unusable. At the same time, the protective sleeve is exposed to the same description as above under harsh working conditions, and it is very easy to damage, aging and failure.

A lot of practice has proved that the second sealing structure also often has the situation that the seal fails and is forced to stop for maintenance

[0009] The third type of sealing structure considers the functions of dustproof, sealing and water-repellent slag, but the sealing effect is the same as that of the second type after installation, and there are often situations where the seal is damaged, aged and failed, and it is forced to stop for maintenance.

However, a lot of practice has proved that this scheme is not successful, and it is also unable to solve the above-mentioned problems of leakage and hardening of the equipment in the rolling line, and the jamming of the tie rod and nut pairs. There is no obvious improvement in the seals of the various channels. For the palace cover, there are bound to be two gaps in the installation that cannot be effectively sealed. Instead, a leak point has been added to the last "O" ring. Therefore, this improvement is actually unsuccessful, and it has the opposite effect.

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