Powder charging system and powder charging method for producing polyurethane sealant

Abstract

The invention discloses a powder charging system and a powder charging method for producing a polyurethane sealant. The charging system comprises a loading system, a drying system, a cooling system and a weighing system, wherein the loading system, the drying system, the cooling system and the weighing system are orderly connected into a closed powder delivery channel. The charging method comprises the steps of loading, drying, cooling and weighting, wherein when the weight of powder in a measuring bin is weighed by a weighing module to be 90% of a set value A, a second conveyor is controlled to add the powder at a dripping speed, and when the weight of the powder in the measuring bin is weighed by the weighing module to be less than the set value A by a value B, the powder is stopped from being fed into the weighing system. The powder charging system and the powder charging method have the advantages that the procedures of loading, drying, cooling and weighing are enabled to be continuous and all completed in the closed channel, the content of moisture of the powder can be well controlled, and therefore, the moisture content of the powder is kept at a low value. The quality of the sealant produced is improved.

Description

[0001] technical field [0002] The invention relates to a powder feeding system and a feeding method, in particular to a powder feeding system and a powder feeding method for producing polyurethane sealants. Background technique [0003] The powder used in the production of polyurethane sealant is extremely sensitive to moisture, such as carbon black or calcium carbonate powder. Since the sealant is extremely sensitive to the moisture content of the raw material, the currently commonly used method is to first put the bagged powder in the oven Internal drying, after the water content reaches the process requirements, take out the bagged powder from the oven, weigh the weight required for the process ratio with a scale, and then manually shake the powder into the batch rubber-making device. Due to the scattered, open, and discontinuous process stages of drying, weighing, and feeding in this traditional feeding method, the dried powder will inevitably come into contact with mo...

AI Technical Summary

Problems solved by technology

Due to the scattered, open, and discontinuous process stages of drying, weighing, and feeding in this traditional feeding method, the dried powder will inevitably come into contact with moisture in the air for many times, affecting product quality, and even in wet seasons. It cannot be produced; manual scales weigh the ingredients, not only cannot realize the continuous sealing of the weighing process, but also the measurement error is large, the amount of powder added fluctuates greatly, and it is difficult to meet the process requirements, resulting in large performance differences and poor consistency between batches of products; However, this traditional open feeding method is labor-intensive, with many operators and high labor costs. The feeding process is easy to form dust, which directly endangers the health of operators and pollutes the environment.

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