Driving device capable of accurately controlling valve

Abstract

The invention discloses a driving device capable of accurately controlling a valve, comprising a worm wheel, a worm and a hand wheel, wherein both ends of the worm are fixedly arranged on a box body by a bearing and an end cover, the worm wheel is arranged on the box body, the hand wheel is fixed on one end of the worm, a clamp ring groove is arranged at the outer end of the bearing on the worm of one side of the hand wheel, a limiting clamp ring is arranged in the clamp ring groove, a locking screw cap is arranged at the outer end of the bearing at the other end of the worm, the locking screw cap is connected with the worm by screw threads and is used for locking the bearing, and a positioning pin which is used for positioning the shaft end of the worm is arranged in the locking screw cap. In the invention, both ends of the worm are axially and respectively positioned by the clamp ring and the locking screw cap to limit the leap of the worm, eliminate driving errors and ensure that the driving device can accurately control the valve.

Description

technical field [0001] The invention relates to a driving device for opening and closing a valve which controls a valve core to rotate 90°. Background technique [0002] At present, the structure of known valve driving devices such as butterfly valves, ball valves, and plug valves that control the spool to rotate 90° is composed of a worm wheel, a worm, a casing, a bearing, an end cover, an indicator plate, and the like. The rotating worm drives the worm wheel to rotate, and the movement of the worm wheel drives the valve shaft fixed in the center hole of the worm wheel through the key to rotate, so as to achieve the control of 90° rotation. However, since the worm of the driving device is fixed in the box through the bearing and the end cover, due to the accumulation of machining errors of each part and the long-term wear between the worm and the worm, the worm will inevitably move along the shaft hole of the box when the valve is opened and closed. For axial movement, the...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the fact that the existing valve driving device cannot precisely control the opening and closing of the valve, the present invention provides a driving device that can precisely control the valve, which can solve the above-mentioned problem that the opening and closing of the valve cannot be accurately controlled due to the machining error and wear of the parts.

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