Grinding repair equipment for valve base sealing surface of steam turbine valve

Abstract

The invention discloses grinding repair equipment for a valve base sealing surface of a steam turbine valve. The equipment comprises an inner support mechanism, a grinding mechanism, a grinding shaft, a grinding outer sleeve, an outer support mechanism, a feeding mechanism and a power mechanism; the grinding outer sleeve is of a cylindrical structure, and sleeves the middle part of the grinding shaft; a slide bearing is arranged between the grinding outer sleeve and the grinding shaft; the grinding mechanism is fixed on the grinding outer sleeve; one end of the grinding shaft is fixedly connected with the inner support mechanism, and the other end of the grinding shaft is fixedly connected with the outer support mechanism; the inner support mechanism comprises multiple support legs uniformly distributed in the peripheral direction; the outer end surfaces of the support legs are arc surfaces; the support legs make contact with and are positioned with the inner surface of the steam turbine valve; the outer support mechanism is mounted on an end flange surface of the steam turbine valve; the feeding mechanism drives the grinding outer sleeve to slide in the axial direction of the grinding shaft; and the power mechanism drives the grinding outer sleeve to rotate. The grinding repair equipment is simple in installation and positioning and convenient to replace, shortens the grinding period, and improves the grinding efficiency.

Description

technical field [0001] The invention relates to the technical field of grinding and repairing, in particular to a grinding and repairing device for the sealing surface of a valve seat of a steam turbine valve. Background technique [0002] Various valves in the steam turbine system and boiler system of the power plant (especially the high and medium pressure horizontal valves of the main engine of the steam turbine), after a certain service period, the valve seat sealing surface of the valve will leak due to wear, oxidation and erosion, so Grinding and repairing equipment is required to grind and repair the sealing surface of the valve seat. [0003] The existing problems in the prior art are: (1) The existing grinding repair equipment usually uses a positioning disc for external positioning, and the positioning disc is installed at the flange of the valve body. Since the size of the flange opening of the valve varies widely (from about φ100mm to φ1500mm), and the installat...

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Problems solved by technology

[0003] The existing problems in the prior art are: (1) The existing grinding repair equipment usually uses a positioning disc for external positioning, and the positioning disc is installed at the flange of the valve body

Since the size of the flange opening of the valve varies widely (from about φ100mm to φ1500mm), and the installation diameter of the positioning disc in the prior art is fixed, it is not only necessary to prepare positioning discs of various diameters, but also to replace them frequently The positioning disc not only seriously affects the work progress, but also brings difficulties to the manufacture and transportation of grinding repair equipment

(2) The existing horizontal valve grinding equipment is divided into two types: one is the one-way positioning structure of the flange mouth. The surface forms an ellipse or deflection, resulting in the leaky seal of the repaired valve

The other is an internal and external two-way positioning structure. The maintenance personnel need to drill into the valve body for alignment adjustment. If the diameter of the valve flange is small, the maintenance personnel will not be able to perform the positioning operation

No matter which positioning structure is adopted, the grinding equipment needs to be dismantled as a whole every time the abrasive is replaced, and the grinding equipment is reinstalled after the abrasive is replaced, which greatly affects the installation and grinding shape and position tolerance accuracy, and prolongs the grinding period, so it is difficult to achieve Technical Requirements for Rapid Overhaul of Power Plants

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