Powder recovering and supplying device of electrostatic powder spraying system

Abstract

The invention provides a powder recovering and supplying device of an electrostatic powder spraying system. The powder recovering and supplying device comprises a recovering pipeline, a mixing unit, asupplementing unit and a supplying pipeline; the mixing unit comprises a first vibrating screen, a second vibrating screen and a supplying box; the two ends of the recovering pipeline communicate with a spraying room of the electrostatic powder spraying system and an inlet of the first vibrating screen respectively; a cyclone recovering device is arranged on the recovering pipeline; the supplementing unit communicates with an inlet of the second vibrating screen; an outlet of the first vibrating screen and an outlet of the second vibrating screen communicate with the supplying box; and the two ends of the supplying pipeline communicates with the supplying box and a powder spraying gun in the spraying room of the electrostatic powder spraying system respectively. According to the powder recovering and supplying device, the first vibrating screen and the second vibrating screen are arranged to screen old powder and new powder respectively, so that the condition of blockage of the vibrating screens due to attraction and agglomeration of the old powder and the new powder due to the fact that the old powder and the new powder are screened in the same vibrating screens simultaneously can be avoided effectively, smooth supplying of the powder is guaranteed, the electrostatic powder spraying operation is performed normally, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of powder electrostatic spraying, in particular to a powder recovery supply device of a powder electrostatic spraying system. Background technique [0002] At present, in the electrostatic powder coating of high-speed intermittent steel plate, aluminum plate or high-speed continuous steel plate and aluminum plate, the running speed of the strip is high, the area to be sprayed per unit time is large, and the amount of powder used in the powder electrostatic spraying operation is large. A large number of powder spraying guns need to be installed in a single powder electrostatic spraying system to meet the powder supply demand. However, in the process of powder electrostatic spraying, the powder sprayed by each powder spray gun cannot be completely adsorbed on the product, and about 20% to 30% of the powder will fall or be sprayed out of the range of the product. For the waste of powder, these redundant powder...

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Problems solved by technology

[0003] However, in actual operation, it was found that since the recovered old powder is sprayed by a powder spray gun with static electricity, there is static electricity attached to it, and when the old powder meets the new powder, it is easy to attract and agglomerate due to electrostatic attraction. The formation of larger particles will easily block the filter screen of the vibrating sieve during the subsequent sieving process, resulting in poor powder passage, reducing the flow of powder passing through the vibrating sieve, resulting in a situation where the powder volume in the powder electrostatic spraying system is in short supply. Especially when spraying some products, when the filter screen of the vibrating screen is very dense and the mesh number is high, the agglomerated powder in the vibrating screen is more difficult to pass through, and it is easy to completely block the vibrating screen. The electrostatic powder spraying operation was stopped to clean the vibrating screen, which seriously affected the normal progress of the powder electrostatic spraying operation, reduced production efficiency, and increased production costs

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