Cleaning/screening machines BSH-3, BSH-6, BSH-12, BSH-16, BSH-100 (referred to below as separators) are designed for cleaning of grain (wheat, rye, oat etc.) from foreign matters (impurities) that are differ by geometrical dimensions and aerodynamic qualities. The machine is operated within grain storages, at flour milling plants and groats mills.

Separators are produced in accordance with third category of GOST-15150 (IEC 60721-2-1; IEC 60068-1), climate version “U” for internal market and export to temperate countries. However, separators have to work reliably in operating regimes at a temperature from 10 (°Ñ) degrees below zero to 40 (°Ñ) degrees above zero, relative moisture 80% with average annual temperature of 15 (°Ñ) degrees above zero, atmospheric pressure from 650 to 800 mm Hg (86,6÷106,7 kPa). The machine is able to start and to work properly with temperature from 30 (°Ñ) degrees below zero when applying special greases.

Specifications

* For cleaning of other plants, different from wheat, the capacity reduces in the following way:

• for rye and corn – by 90%;

• for panic grass and barley – by 80%;

• for buckwheat and oat – by 70%;

• for sunflower – by 12% of rated.

Separator technical capacity reduces with increasing of grain moisture and impurities content, for example:

• with moisture 15-18% goes down to 65-70%;

• with moisture 18-22% goes down to 55-60%;

• with moisture above 22% goes down to 50% of rated. 

Content of delivery. Separators are provided pre-assembled.

* On customer’s order separators BSH-100, BSH-16, BSH-12 and BSH-6 can be supplied with aspiration chamber BSH-100.20.000 instead of aspiration channel in the same quantity, example at pic. 14.

Structure and Functioning

Screen grain cleaner and separator BSH-3 consists of screen separator, and separators BSH-6, BSH-12, BSH-16, BSH-100 consist of screen separator and aspiration channel with support equipment: distributor, adapter and grain collector.

Separator (pic.4-4b) consists of the following parts: frame 1, body 2 with screen frames 3, drive 4, traverse 5 with balancing mechanism. The body is suspended to the frame by flexible suspensions. Suspensions are made of unidirectional fiber glass SSO-VP, diameter 12 mm. in accordance with technical requirements TU 6-11-585-84. Other materials are FORBIDDEN!

Screen frames 4 are installed in the body (pic.10) by slideway railings 9, fixed on body side frames, and fixed rigidly by clamps 7. The adjustment of clamping mechanism is carried out in fully open position so that clearance between clamp shim surface and upper frame plane would be 3±0,5 mm. Clamps are shifted by special eccentric element – key, which is included into content of delivery. With rotation of eccentric cartridges 3, vertical displacement of rollers 5 and clamps 7, and, therefore, nip and release of screen frames are occurred. In order to ensure simultaneous nip and release of upper and lower frames, rollers on both sides of the body are connected by levers 2. During screen frames release clamps 7 retreat on 3-4 mm. from screens that provides frames dismantlement.

Frame structure is divided into meshes by long and cross baffles, where special rubber balls for cleaning of screens from trapped debris are placed. Installation of screen frames along the body is performed as follows (pic.11): loosen the screw nuts 2 and, by turning screw nuts 1, shift screen frames by screw-bolts 4 in such a manner that upper screen lies on the tray and lower screen on back lower connection for cleaned grain removal. Next, screens position is fixed by screw nuts 2. ATTENTION! On BSH-12 and BSH-100 separators screen of the front frame must lie on the back frame structure.

At the front wall of screen body electric motor with drive pulley is installed, which through the V-belt transmission rotates the pulley 7 (pic. 12) with unbalanced weight fixed on it, which provides a circular motion of the screen body. The pulley rotates freely on the bearings 5, which are mounted on the axle 9 pressed into the traverse 8. Bearings are closed with covers 4 and 6. Bearings greasing is provided by gun through oil feeder 11, oil pipe 10, hole in the axle 9 and ring 3 for BSH-16 and BSH-100, and through oil feeder placed on pulley hub 7 for BSH-3, BSH-6 and BSH-12.

From the top at the front side of the body nozzles 7 and 8 (pic. 4-4b) are arranged for supply of sorted product into the body. There is also a distributing trough 9 for equal distribution of the product along the width of screens. The frame consists of the front and back pillar, which are connected together by side walls. At the front pillar nozzles for product supply to separator are installed and equipped with inspection windows. Nozzle for connection to aspiration network is fixed at the back pillar. In order to prevent possible body impact on frame in the moments of start and stop, the limiter 15 with a rubber bumper is fixed on the lower back of the frame connection. For this purpose there are also two rubber limiters fixed on the front pillar of the frame.

Aspiration channel serves for extraction of light impurities from the product. It consists of the housing inside which movable wall is installed. Handle rotation provides shifting of lower and upper parts of the movable wall. Air consumption is regulated by throttle valve via hand lever. Movable wall is made of transparent material (or with inspection window if the wall is nontransparent) to observe separation process. Inlet box 19 with tray is designed for uniform feed of product to aspiration channel. From above, on the channel housing adapter 20 for connection to the air duct is installed. Collector 17 is installed under the duct for cleaned grain removal. Distributor 8 is designed to divide the feedstock into two identical flows that ensures an equal distribution of grain along the width of separator screens. Grain distribution is provided by weighted slide valve. The uniformity of grain flow is regulated by weight motion on stud bolt.

Operation concept of the separator is as follows. Product through the inlet nozzle flows to the distributor 8, where it is divided into two flows and transferred to the body section by nozzles 7. ATTENTION! To avoid body misalignment in operation, it is necessary to ensure a constant equal supply of grain to each flow. The machine’s body circulates that impacts the product to shift over the screen followed by assortment. An apron in the body reduces possibility of grain removal to rejects.

Coarse impurities are removed from the separator through the trays 12, mixture of grain with fine and light impurities is transferred to the lower screen frame through upper screen. Fine and light impurities that have spilled through lower screen, fall to the bottom of separator, and are removed from the machine through the tray 13. Grain, cleaned on screens from coarse, fine and light impurities, enters to the receiver of the aspiration channel, and then, using the tray, uniform flow is supplied to the aspiration channel, where product is intensively blown off by the air flow. Completely cleaned grain is removed from the machine through the bottom collector 17. Air from the body and aspiration channel is transferred through air ducts to the cyclone for cleaning from aspiration foreign matters (impurities).

Recommended installation diagrams of separators in set with aspiration equipment are shown on pics. 7 and 7a. Separators can be applied both for pre-cleaning (receiving cleaning process) and main cleaning (industrial cleaning process) depending on screens type.

To clean the grain from impurities that differ by dimensions different screens, corresponding to shape and size of dominant crops and foreign impurities, can be applied: with circular, elongated and triangle holes. Recommended size and type of screens please find in the table below. Capacity of the separator reduces with increasing of grain moisture and impurities content. 

ATTENTION! Screens selection is carried out by the consumer at worksite depending on feedstock and its characteristics (moisture, impurities content, grain particle size etc.) for the purpose of obtaining the required cleaning standard.

Recommended screens characteristics for cleaning of different crops

Notice 1. If necessary, the elongated holes can be replaced by round ones and in reverse, taking into account the following formula:

Â=(0,70…0,75)d,

with Â – width of elongated hole; d – internal diameter.

Notice 2. To obtain the required cleaning standard and capacity screens selection is carried out by the consumer individually at worksite as dimensional characteristics of the same crop may differ depending on variety and growing area.