Sieving device of dry-process granulating machine

Abstract

The invention discloses a sieving device of a dry-process granulating machine. The sieving device comprises a sieving barrel, a sieving disc and a powder receiving disc, wherein the barrel wall of the sieving barrel is provided with a feeding port, a fine-powder discharging port and a finished-product discharging port; the feeding port is arranged at the upper part of the sieving barrel; the finished-product discharging port is arranged at the lower part of the sieving barrel; the fine-powder discharging port is communicated with a negative pressure system; the sieving disc is arranged in the sieving barrel to separate the feeding port from the finished-product discharging port; when the sieving disc works, the up-down vibration is realized by a vibrator; the powder receiving disc is arranged under the sieving disc; the sieving disc and the powder receiving disc are connected to form a closed powder cavity for communication with the fine-powder discharging port; the disc surface of the sieving disc is in a downslope shape from the center to the periphery; the disc surface of the powder receiving disc is in an upslope shape from the center to the periphery. The sieving device is characterized in that the upslope-shaped disc surface of the powder receiving disc is formed by continuous connection of multi-stage steps, and the step surfaces of the steps are in a downslope shape with the direction being opposite to the upslope-shaped disc surface of the powder receiving disc. The sieving device disclosed by the invention has the advantages that the sieving effect is good, the sieving efficiency is high, the purity degree of finished particles is improved and the fine-powder rate of a finished product is controlled to below 4%.

Description

technical field [0001] The invention relates to a dry granulator, in particular to a sorting device of the dry granulator. Background technique [0002] Dry granulator is used in the production of granular products, mainly including feeding device, feeding device, tablet pressing device, granulation device, granulation device, sieving device and other parts. The function of sieving device is to mix semi-finished products The granules are sieved into fine powder (including fine particles) and qualified finished granules. At present, the dry granulator sieving device on the market generally has the disadvantages of poor sieving effect, low sieving efficiency, poor purity of finished granules, and high fine powder rate of finished products, especially in the sieving process. Make dust flying and pollute the environment. In order to solve the above technical problems, the applicant applied for a utility model patent with the patent number 201320285668.6 and the patent name "Si...

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Problems solved by technology

At present, the dry granulator sieving device on the market generally has the disadvantages of poor sieving effect, low sieving efficiency, poor purity of finished granules, and high fine powder rate of finished products, especially in the sieving process. Make dust fly and pollute the environment

In order to solve the above technical problems, the applicant applied for a utility model patent with the patent number 201320285668.6 and the patent name "Sieving Device for Dry Granulator" on May 23, 2013, although the above patent technology solved the above deficiencies to a certain extent However, in the actual trial production process of the above-mentioned patented technology, it is found that the fine powder that passes through the sieve hole of the sieve plate falls on the powder receiving plate, and will not slide and gather in the center of the powder receiving plate, that is, downhill, with the vibration of the powder receiving plate. (The center of the powder receiving plate is close to the inlet of the fine powder outlet, and this position has a large pressure difference from other positions inside the sieve barrel, so that the fine powder can be sucked away smoothly), but it will crawl in the opposite uphill direction , and even through the sieve plate sieve holes reverse overflow and mixed with qualified finished product particles, resulting in the technical goals pursued in the patented technology not meeting the requirements

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