Diversion and drainage water-proof structure for gearbox of stretch-reducing mill

Abstract

Provided is a diversion and drainage water-proof structure for a gearbox of a stretch-reducing mill. A water diversion sleeve is arranged between a lower outer sheath of the gearbox and a bearing end cover. A water diversion hole is arranged in the inclined inner side surface of the water diversion sleeve and enables water liquid entering between the lower outer sheath and a power output shaft to be timely drained away by diversion. The bottom of the water diversion sleeve is provided with an axial water-insulating cap having the external diameter less than diameter of an inner hole of the water diversion sleeve. The top surface of the water-insulating cap is located higher than the bottom side of the water diversion hole. Therefore, water liquid is effectively prevented from seeping into an inner cavity of the gearbox by means of a labyrinth-type mechanical seal structure. Various defects arising from mixing of cooling water entering the gearbox and lubricating oil are eradicated. By adoption of the structure, the replacement period of lubricating oil is extended to 12 months from original 4 months and the overhaul period of the gearbox is extended to 18 months. Therefore, cost of production and maintenance can be decreased by 3 / 5 compared with a prior art so that economic benefit and social benefit are significant.

Description

Technical field: [0001] The invention relates to seamless steel pipe production equipment, in particular to a stretching and reducing machine, and more particularly to a reduction box of the stretching and reducing machine. Background technique: [0002] The steel pipe tension reducing machine is used to continuously roll the high-temperature blank pipe (temperature 920-1050 ℃) sent over after piercing and rolling, so that the same specification of the main pipe can be aligned with the frame hole at different tension speeds. Seamless steel pipes of different specifications are rolled out under the mold. [0003] At present, steel pipe tension reducing machines include three sets of roll parts and frames that form 120° each other. One set of roll parts is in a vertical state, and the other two groups are symmetrically distributed with the vertical unit as the axis of symmetry. The three sets of roll parts are divided into "people "" shape or inverted "herringbone" shape are ...

AI Technical Summary

Problems solved by technology

[0006] After the sprayed cooling water falls on the upper sheath 24, it will flow down the axial direction along its outer surface. When the cooling water encounters the high-temperature waste pipe and the double-ended butt joint part 25 with a temperature higher than 100 degrees, a large amount of mist will be generated. Water vapor, mist water vapor then condenses into liquid on the side wall of the inner hole of the lower outer sheath 18 through the gap between the upper sheath 24 and the lower outer sheath 18, and then enters the lower outer sheath along the inner hole side wall of the lower outer sheath 18. In the gap between the sheath 18 and the power output shaft 14 and the bearing end cover, although the bottom is sealed and blocked by the skeleton sealing ring 15 and the bearing end cover 16, during the steel rolling process, especially when the roll is biting the steel with the high temperature waste pipe At the moment, the roll is subjected to a huge unilateral radial force, which causes reverse lateral movement and deformation between the power output shaft 14 and the skeleton seal ring 15, destroying the sealing relationship between the two, and when the ambient temperature is high Under certain conditions, the PTO shaft 14 rotates at a relatively high linear velocity (2 m / S), and the skeleton sealing ring 15 will cause unilateral wear to the PTO shaft 14, thereby destroying the original relationship between the skeleton sealing ring 15 and the PTO shaft 14. The sealing fit relationship, the water liquid stored between the lower outer sheath 18 and the power output shaft 14 penetrates into the inner cavity of the reduction box 11, so that the cooling water and the lubricating oil are mixed, and under the high-speed stirring of the rotating gear, The lubricating oil continuously produces foam, and the high temperature makes the oil-water mixture continue to ferment and accelerate the deterioration. This destroys the original design lubrication system in the gearbox 1, the lubricating oil is polluted, and the cooling water enters the gearbox. As the permeated water increases, not only It will cause the viscosity of the lubricating oil in the reduction box 1 to decrease, and it will also cause the lubricating oil to foam and the oil to deteriorate and smell. Because the lubricating protection function of the lubricating oil is destroyed, it will not only cause the rotation of the bearings and gears in the reduction box 1. Early wear and damage of parts, and the inner surface of the reduction box 11, transmission shaft, gears and metal parts will be rusted or corroded

Not only reduces the service life of the lubricating oil in the reduction box 1, but also reduces the service life of all metal parts in the reduction box 1. As long as any part in the reduction box 1 is damaged or needs to replace the lubricating oil, it will inevitably lead to a shutdown of more than 24 hours. Every time, the direct economic loss to the enterprise is as high as 600,000 yuan, and the indirect economic loss caused by the suspension of production is as high as 2 million yuan.

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