Negative-pressure weighing device and weighing method

Abstract

The invention discloses a negative-pressure weighing device. The negative-pressure weighing device comprises a weighing box body; a weighing chamber is defined at the front part of the interior of theweighing box body; the bottom of the weighing chamber is provided with a weighing device; the rear part of the weighing chamber is provided with a back plate which plays a role of separation; the topof the weighing chamber is provided with a static pressure box; a filtering chamber is formed behind the back plate; the bottom of the back plate is provided with a filtering screen; the bottom of the filtering chamber is provided with a primary effect filter; the primary effect filter is corresponding to the filtering screen; the rear of the primary effect filter is provided with an intermediateeffect filter; the top surface of the intermediate effect filter is provided with a circulation fan; the circulation fan is connected with the static pressure box through an air pipe; the front sidesurface of the static pressure box is provided with a side air exhausting high-efficiency filter; the side air exhausting high-efficiency filter is provided with a regulating valve; and the bottom surface of the static pressure box is provided with a unidirectional flow high-efficiency filter. With the negative-pressure weighing device of the invention adopted, a dust removal requirement can be satisfied; dust overflow and rise can be controlled; the risk of dust cross-contamination can be avoided; the dust can be prevented from being inhaled by a human body and hurting the human body; the safety of an external environment and people in an indoor environment can be protected.

Description

technical field [0001] The invention relates to the technical field of negative pressure weighing, in particular to a negative pressure weighing device and a weighing method. Background technique [0002] Article 52 of the new version of GMP states that the weighing of raw and auxiliary materials for preparations should usually be carried out in a specially designed weighing room. Article 53 of the new version of GMP states: Dust-producing operation rooms (such as sampling, weighing, mixing, packaging, etc. of dry materials or products) should maintain a relatively negative pressure or take special measures to prevent dust from spreading and avoid cross-contamination and easy to clean. EU GMP guidelines require: The weighing of starting materials usually needs to be carried out in an isolated weighing room designed according to the purpose. China's drug GMP guidelines believe that large dust will also be generated during the weighing process, and pollution and cross-contam...

AI Technical Summary

Problems solved by technology

There are various defects in the existing material powder weighing, lack of operation in an area equipped with a dust removal system, and lack of isolation measures, which increase the operator's exposure to the product, inaccurate weighing, and high equipment operating costs

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