Vacuum cover hoisting device of quality comparator and application thereof

Abstract

The invention relates to a vacuum cover hoisting device of a quality comparator, comprising a frame, a vacuum cover, a quality comparator, an experiment table, a pulley, a steel wire rope, a manual ratchet wheel and a guiding rod. The vacuum cover comprises an upper part and a lower part, the top end of the upper part of the vacuum cover is provided with rings, the quality comparator is fixed at the lower part of the vacuum cover, the upper part and the lower part of the vacuum cover are both provided with flange edges which are also respectively provided with an inner thread hole for installing an environmental parameter measuring device, and the inner thread holes are vertically opposite. One end of the steel wire rope hangs a counter weight after wound on the manual ratchet wheel. The vacuum cover hoisting device can be used for hoisting the upper part of the vacuum cover of the quality comparator in an at least E1-grade one-kilogram weight quality measuring experiment, has the advantages of less space occupation and adjustable lifting and dropping speed and direction and can ensure the vertical motion of the upper part of the vacuum cover without damaging the high-precision quality comparator in the vacuum cover or the vacuum cover.

Description

technical field [0001] The invention belongs to the field of metrology, and in particular relates to a lifting device for a mass comparator vacuum cover used in high-accuracy weight mass measurement experiments, especially E 1 The lifting device of the vacuum cover of the mass comparator used in the mass measurement experiment of the 1kg weight of grade and above. Background technique [0002] In high-accuracy weight measurement experiments, especially E 1 In the mass measurement experiment of 1kg weights of grade and above, a mass comparator with a maximum weighing range of 1kg and a resolution of at least 0.1μg is required for mass measurement. The experiment needs to be carried out in a vacuum environment, which is usually achieved by using a vacuum hood. The vacuum cover used is a cylindrical cavity with a diameter of more than 600mm and a height of about 800mm. It is made of stainless steel and the wall thickness is close to 10mm. It consists of upper and lower parts....

AI Technical Summary

Problems solved by technology

Due to the eccentric structure of the vacuum cover itself, the method of counterweight and manual operation has poor controllability, and it is difficult to grasp the lifting direction and lifting speed. The speed is uneven or the lifting direction is not vertical, which may cause the upper part of the vacuum cover to shift. The high-precision mass comparator in the cover will cause the mass comparator to be damaged or even scrapped, and the economic loss will be very large

And when falling, due to manual operation, the speed and direction are difficult to grasp, and it cannot fall accurately to the position matching the lower part of the vacuum cover, and may cause impact on the lower part of the vacuum cover, damaging the vacuum cover equipment

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