Worm gearing limit structure improvement

2019 - worm gearing limit structure improvement 10 - 19 zhen-feng zhou Zhou Xinyuan ( Zhengzhou zheng butterfly valve door co. , LTD. ) Abstract: the author analyzes the 90 & deg; Rotary valve with the worm gear worm gear box mechanical limit problems of structure, introduces the improvement methods and application effect. Key words: worm gear drive; Mechanical limit; Structure of 1, an overview of the worm gear as the butterfly valve and ball valve, such as 90 & deg; Rotary valve opening and closing operation mechanism has been widely used, but the worm gear box accurate control valve fully open or close position of the mechanical limit structure loose lifting transport, handling and installation process, limit screw seal leakage, adjust the operating parts exposed, non-professional personnel can adjust at will, seriously affect the safe operation of the equipment. Through the analysis of improved mechanical limit structure and improve the device performance. 2, analysis of the mechanical limit the structure improvement of worm gearing, limit screw hole screw-in by worm gear box body silk, roof fan worm gear, and then use the nut lock ( FIG. 1) 。 The structure is simple, easy to assemble, but problems frequently in use. (1) caused by vibration, touches or wrong operation and so on limit screw loosening, already setting trims full open and close position of abnormal. (2) limit screw and worm gear box body o-ring seals, the silk worm gear box body parts processing hole with a hole concentricity and accuracy is not guaranteed, often caused by untight seal. Valve installed in underground Wells, the rain water, flooding, the inside of the worm gear box for torque and affect the operation of the valve switch operation safety. 3, the improvement to prevent the limit screw loose, in the limit screw rod end with blocks ( Blocks in the graphic processing o-ring groove) 。 Add the o-ring limit screw and worm gear drive with thread and limit screw thread pitch is different with blocks. Trims full open and close position after setting, the screw cap on the limit screw, screw and worm gear box body is fixed. Mechanical limit structure improved to achieve the disc in full open and close position accurately. Since set up blocks, solves the limit to adjust parts exposed and wrong operation. 4, endnotes and worm gear after the modification of the mechanical limit structure, 90 & deg; Rotary valve is fully open and close position limit, safe and reliable seal, without leakage on site and correct operation and adjust at phenomenon, reasonable structure. Verified by batch production and application, and meet the requirement of field use and has received the good effect. Source: the valve 2015, 02