Flange manhole for self-balancing horizontal rotary cover

Abstract

The present invention discloses a flange manhole for a self-balancing horizontal rotary cover. The flange manhole for the rotary cover consists of a manhole, a flange fixed at the upper end of the manhole and a rotary cover used for sealing the manhole, wherein the rear ends of the flange and the rotary cover are rotatably connected through a connecting shaft. The flange manhole is also provided with a spring cylinder balancing system consisting of a spring cylinder, a connecting piece and a spring cylinder support lug. The flange manhole for the self-balancing horizontal rotary cover is provided with the spring cylinder balancing system, and the torque formed by the tension of the spring cylinder is equal to that formed by the gravity of the rotary cover, so that the rotary cover can be balanced at any point within the range of 0-90 degrees, the opening of the rotary cover is safe, and the labor is saved.

Description

technical field [0001] The invention belongs to the improved structure of the manhole of the pressure vessel, and mainly relates to a spring-cylinder balance system using the principle of lever balance, so as to achieve the effect of labor-saving and safe opening of the manhole of the pressure vessel. Background technique [0002] Manholes are one of the most commonly used parts on various containers in the chemical and petrochemical industries. TSG R0004-2009 "Safety Technical Supervision Regulations for Stationary Pressure Vessels" clearly stipulates that pressure vessels should be equipped with inspection holes such as manholes and hand holes as needed. In order to facilitate the inspection and maintenance of equipment. It can be seen that the pressure vessel manhole is important as a vessel component. [0003] Commonly used pressure vessel manholes include atmospheric pressure manholes, rotary cover flange manholes, vertical hanging cover flange manholes, horizontal ha...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the flange cover is often heavy for manholes with large diameter and high nominal pressure.

For example: the weight of flange BL500-16RF (HG / T20592) is 133Kg, the weight of flange BL600-16RF (HG / T20592) reaches 226Kg, and manual opening is even more laborious

For the manhole of the horizontal hanging cover, since the rotating arm is opened by rotating the center of the casing, friction will be generated between the flange cover, the gasket and the flange, which is easy to damage the sealing system of the flange joint

And if it is a carbon steel manhole, the flange cover and the flange will produce sparks due to friction

For occasions with high requirements, it is easy to cause safety hazards

In addition, as the weight of the flange increases, the frictional force is greater. Taking the 226Kg flange BL600-16 as an example, assuming that the gasket material is asbestos, the friction coefficient between steel and asbestos is 0.25 ~0.4, the calculated friction result is between 56.6~90.6kg, which is not labor-saving for manual operation

In addition, the manhole is generally placed above the equipment, and the position is relatively high. When opening the cover, it is easy for people to lose their balance, resulting in unsafe conditions.

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