Flour grading equipment-Square Plansifter

www.wheatmillmachinery.com

The basic concept of flour classification

In the modern milling process, the material grading machinery occupies a very important position, its main role is to crush the cereal mixture, according to the physical properties of the powder sorted into different sizes and quality of the material, so as to achieve the preparation of the The purpose of grade flour, which is conducive to achieving high yield, high efficiency and low energy consumption requirements.

Material classification is an important part of the study of milling process, mainly for the screening and clearing powder, and commonly used screening equipment with flat screen, round sieve, clear powder equipment for the extension.

In the grinding and milling, the purpose of screening is to remove the flour from the ground, the product will be graded according to the size of the product.In the process of milling, the screening equipment, if not in the grinding of flour in a timely manner, will make the follow-up equipment load increases, lower production, increased power consumption, grinding efficiency;If the various types of products in the grading is not classified, it may make the follow-up of the system flow distribution imbalance.

After the grinding of the material classification, sieve powder is mainly used in a similar cleaning machine sieve sorting method, the various grinders out of the grinding of the grading, it may make the follow-up of the system flow distribution imbalance.

After grinding the classification of materials, sieve powder is mainly used in similar cleaning machinery in the sieve sorting method, the grinding mill grinding the ground to be graded in order to separate the different size of the material were sent to the back of the grinding Machine for further grinding, crushing, and which has reached the finished product size requirements of the flour as a separate way to collect or sent to other machinery and equipment for the final treatment or direct packaging, flat screen is the most important flour mill equipment.

The process of the powder is based on the quality of the similar size of the products (wheat slag, wheat or coarse powder) for purification grade. In the grinding and milling process, because the flat screen sieve material contains a small amount of the same size of the skin and even the skin endosperm, such materials if sent to the demons grinding, the quality of the flour will have a negative impact, and The use of the extension of the skin and even the skin endosperm proposed, heart of the machine into the material is purified by the heart particles. Clear powder is the production of higher grade flour essential process conditions.

Overview of flat screens

Tracing the development process of flour flat screen, at least 300 years of history. As early as the sieve is generally hand-cranked, for the simple wooden frame structure, and in the process of sifting powder, the human hand to continue to contact the screen surface, play a role in cleaning and stirring.At that time most of the screen material used papyrus, reed, horse hair, linen line, linen fiber and cotton thread, mesh larger. Until the end of the 19th century, the milling industry began to appear flat screen, with the technology mature, it gradually replaced the round screen.Today, countries around the world are widely used to make and use flat screens.

Flat screen is the main screening equipment in the flour mill.Its most basic working parts are sieve body, built-in multi-layer screening, commonly used in the mainstream material classification, sieve powder. Sieve body shape was square, equipped with 4 to 8 sieve, each siege built-in 16 to 28 layers of grid, forming a top-down, independent screening route. The screen is a horizontal device, the entire sieve body is located in the sieve around the four groups of suspended sling hanging in the plant floor beam, the center of the sieve body installed with emphasis on the transmission mechanism, the emphasis on the inertia of the mechanism after the rotation to promote the plane Movement, so called flat screen.The main feature of the flat screen is that the sieving area is large and the structure is compact. In the case of the same screening area, the high imitation flat screen has the advantages of volume and placement space and grading.

Flour mill finished flour are basically through a flat screen sieve, so sieve powder screen should have the following requirements:

(1)Extension of powder technology to be more and adjustable. Finished varieties and quality to be able to adjust, and the number of extensions should also be adjusted at any time.

(2)Material flow should be large, in the conventional process conditions will not be blocked, the ability to adapt to fluctuations should be strong.

(3)Do not flow powder, do not leak powder.

(4)Powder sieve inside does not condensation, no fouling insects. Because the material produced by the grinding most of the heat into the flat screen, and the sieve in vitro temperature is low, leading to powder sieve wall condensation, dust sticks on the formation of powder. After a certain period of time on the mold, affecting the quality of finished powder.

(5)The structural properties of the flour flat screen must meet the requirements of the process performance, have a reasonable structural design, insulation performance is better, have a reasonable sieve and sieve, reliable sealing materials and adhesive technology, the proper use and maintenance.

The sieve shape of the flat screen has two kinds of square and rectangular, the use of square grid, the installation adjustment is more convenient, the current commonly used multi-grid square grid high square screen.

Flat screen can be built with the drive motor or by the external motor through the vertical shaft drive, the transmission form of vertical shaft drive and no vertical shaft drive two. Often use a flat screen with a motor drive.

Flat screen in the treatment of a grinding of the work unit to become a warehouse, a flat screen with a single form, commonly used for more than a flat screen, there are four positions, six positions or eight positions three types, the corresponding can handle a variety of materials, The number of positions more flat screen relative to the smaller footprint, but the equipment itself is larger.