Sand blasting device and method for surface post-treatment of cast valve body

Abstract

The invention provides a sand blasting device and method for surface post-treatment of a cast valve body, and relates to the field of valve body surface treatment. The sand blasting device comprises a rotary table installed in a working cabin and provided with a clamp used for clamping a workpiece, a sand blasting mechanism comprising a plurality of sand blasting branches respectively communicated with the sand blasting supply mechanism, and a sand blasting support, wherein the output ends of the sand blasting branches are respectively connected with sand blasting nozzles; the sand blasting support is installed on a three-axis movement mechanism, the sand blasting support is provided with a plurality of cantilever rods which are arranged at included angles, and the sand blasting nozzles are installed at the tail ends of the cantilever rods in a one-to-one correspondence mode; when the rotary table and / or the three-axis movement mechanism act, the sand blasting nozzles can conduct sand blasting on the outer surface of a workpiece and / or extend into the workpiece to conduct sand blasting on the inner surface; and sand blasting is conducted on the inner surface of the workpiece, the three-axis movement mechanism drives the sand blasting support to move, the sand blasting support feeds the sand blasting nozzles at the tail ends of the cantilever rods into the workpiece to be subjected to sand blasting machining, the action range covers the inner wall of the workpiece, and the requirement for comprehensive sand blasting of the workpiece is met by combining sand blasting of the outer wall of the workpiece when the sand blasting nozzles are located outside the workpiece.

Description

technical field [0001] The disclosure relates to the field of valve body surface treatment, in particular to a sand blasting device and method for post-treatment of the surface of a cast valve body. Background technique [0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, adjust and control the parameters (temperature, pressure and flow) of the conveying medium. Casting molding is the most widely used molding method in the production process of valves. Most of the casting, heat treatment and surface treatment parts must be sandblasted to remove surface scale, sticky sand, old coating, molten salt heat, rust, etc. [0003] The inventors found that for the elimination of residual sand on the surface and interior of the valve body after casting, and the sandblasting of the inner and outer surfaces before painting, most of the existing sandblasting methods use sandblasting nozzles located outside the valve body to perform sandblastin...

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Problems solved by technology

[0003] The inventors found that for the elimination of residual sand on the surface and interior of the valve body after casting, and the sandblasting of the inner and outer surfaces before painting, most of the existing sandblasting methods use sandblasting nozzles located outside the valve body to perform sandblasting toward the valve body, although it can Good effect on the surface of the valve body, but for the sandblasting treatment inside the valve body, especially the sandblasting inside the small valve body, when the sand flow enters the valve body due to the angle restriction, it cannot fully cover the inner wall of the valve body, making it difficult to perform sandblasting in some areas. Sand blasting treatment; for some high-precision top-entry ball valves, side-entry ball valves, gate valves or butterfly valves, it is necessary to carry out comprehensive sandblasting treatment on the inside of the valve body, and the valve body and spray nozzle can be changed by adjusting the valve body fixture. Angle to increase the coverage of sandblasting, but still limited by the aperture of the small valve body, the area inside the valve body cannot be covered, and it is difficult to meet the comprehensive sandblasting requirements of the valve body

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