System and method for intermittent negative-pressure pneumatic conveying for powder

Abstract

The invention provides a system and a method for intermittent negative-pressure pneumatic conveying for a powder. The system comprises a feeding device, a horizontal feeder, a conveying pipeline, a separator, a dust remover, a blowback device, an air source, auxiliary equipment and a control device. According to the system and the method, the possibility of arching in a hopper and adhesion onto the wall of the hopper, of materials, is lowered, through using an air nozzle air-supplementing device and the novel horizontal feeder; the safety of the system is improved through installing a safety valve and a vacuum pressure sensor; the cost is lowered and the floor area is reduced by virtue of the integrated structure of the separator and the dust remover; the filter effect is enhanced and the number of filters is reduced through designing a filter with a novel structure; a pneumatic component and an electromagnetic valve are matched by virtue of the characteristics of high flexibility and high reliability of a PLC; and the need of frequently starting up and turning off a fan in order to realize an intermittent conveying manner at the present stage is avoided through using a ball valve. The system provided by the invention has the advantages of being simple in structure, low in cost, high in automation degree, high in conveying speed and the like, and reduces human labour.

Description

technical field [0001] The invention relates to a powder pneumatic conveying system and method, especially suitable for short-distance, non-continuous powder, an intermittent powder negative pressure pneumatic conveying system that can convey powder from multiple points to one point, and belongs to pneumatic conveying technology field. Background technique [0002] In the industrial production of powder, various raw materials often need to be mixed together and poured into the mixer. After the mixer is evenly stirred, the material in the mixer hopper is transported to the packaging machine hopper by the conveying device for packaging. When the mixer is working, The conveying device is in a non-working state, and the conveying device works only when conveying materials. At this time, an intermittent conveying system is needed, which can quickly convey the materials in the hopper of the mixer to the hopper of the packaging machine. [0003] At present, the negative pressure ...

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Problems solved by technology

[0003] At present, the negative pressure pneumatic conveying products and patents on the market mainly include: a negative pressure vacuum suction machine, the feeding method is that the stainless steel suction nozzle is directly inserted into the material, and the material is sucked in with the outside air to form a material air flow, which passes through the suction pipe Arriving at the hopper, the gas and material are separated in the hopper. The filter in the hopper adopts a straight-through PE filter and the number is large. When conveying, it requires too much manual participation and the degree of automation is low; patent application number: 201310460332.3 "a kind of flour Pneumatic conveying system", the feeding method adopts the direct drop feeder, the dust collector adopts the traditional cyclone separator, the equipment is complicated, and the floor area is large. To realize intermittent conveying, the air source must be shut down and started frequently; Patent application number: 200820124058.7 is "bulk material negative pressure pneumatic conveying system". The separator is a centrifugal separator and the separator and dust collector adopt a two-stage structure, and a two-stage filtration scheme is adopted, which takes up a lot of space and complicated equipment. Intermittent delivery not possible

[0004] To sum up, the current powder negative pressure pneumatic conveying technology has the following problems: first, the material in the feeding hopper falls directly into the feeder, which is not controlled, and the material is easy to arch in the hopper; second, the feeding The structure of the feeder is simple, and the material falls directly to the bottom, which is easy to cause blockage of the feeder and damage the system; third, the door of the unloading bin adopts a rotating baffle mechanism, which is not well sealed and requires an additional power source; fourth , using straight filters, the filtration efficiency is not high, and the number of filters is too large; fifth, to achieve intermittent transmission requires frequent startup and shutdown of the fan, which has a great impact on the life of the fan and the power grid; sixth, the degree of automation Not high, human labor intensity is high

[0005] In short, the current intermittent conveying system has a low degree of automation, high labor intensity, unreasonable structural design, and low conveying efficiency. It is urgent to develop an intermittent conveying system and method with high conveying efficiency and automation.

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