Grain-cleaning separator БСХ-3

Purpose:

Grain-cleaning separator БСХ-3 is designed for cleaning grain from the impurities, different from it in width, thickness and aerodynamic properties. The separator is installed in the grain cleaning departments of mills, elevators, groats and flour mills.

The separators operate reliably in operating modes at temperatures from minus 10 to plus 40 °C, relative humidity 80% at an average annual temperature of plus 15 °C, atmospheric pressure from 650 to 800 mm Hg. (86.6 ÷ 106.7 kPa). When using special greases, the separator starts up and operates reliably at temperatures from minus 30 °C.

Specifications:

*For cleaning grain other than wheat, productivity is reduced as follows:

• for rye and corn - up to 90%;
• for millet and barley - up to 80%;
• for buckwheat and oats - up to 70%;
• for sunflower - up to 12% of the nominal.

The performance of the separators decreases with increased contamination and moisture content of the grain, for example:

• at a humidity of 15-18% up to 65-70%;
• at a humidity of 18-22% up to 55-60%;
• at humidity over 22% to 50% nominal.

Design and operation:

Grain separator БСХ-3 consists of a sieve separator. Separators БСХ-6, БСХ-12, БСХ-16, БСХ-100 consist of a sieve separator and a pneumatic separation channel, to which auxiliary equipment is connected: distributor, adapter and grain collector.

The separator consists of the following units: frame (1), body (2) with sieve frames (3), drive (4), crosshead (5) with a balancing mechanism. The body is suspended from the frame on flexible suspensions. Suspensions are made of unidirectional fiberglass grade ССО-ВП with a diameter of 12 mm according to ТУ 6-11-585-84. It is FORBIDDEN to use other materials!

The sieve frames (4) are inserted into the body (Fig. 10) along the guides (9), fixed on the sidewalls of the body (1)0, and are fixed motionlessly by means of the clamps (7). The clamping mechanism is adjusted in a fully open position so that the gap between the surfaces of the clamp gaskets and the plane of the upper frame should be 3 ± 0.5 mm. The clamps are moved by a special eccentric device - a key included in the delivery set. In this case, the eccentric sleeves (3) are rotated, as a result of which the vertical movement of the rollers (5) and the clamps (7) is ensured. Thus, the clamping and release of the sieve frames are provided. In order to ensure the simultaneous clamping and release of the upper and lower frames, the rollers on both sides of the body are connected by levers (2). When the sieve frames are released, the clamps (7) move 3-4 mm away from the sieves, as a result of which the frames are dismantled.

The frameworks of the frames are divided by longitudinal and transverse partitions into cells, in which rubber balls are placed, designed to clean the sieves from contamination. The sieve frames are installed along the body as follows: loosen the nuts 2 and, turning the nuts 1, move the sieve frames using the bolts (4) so that the upper sieve lies on the chute, and the lower sieve lies on the rear lower link for the cleared grain discharge. After that, the position of the sieves is fixed with nuts (pos. 2). On separators БСХ-3, БСХ-6 and БСХ-12, the sieve of the front frame must rest on the frame of the rear frame.

On top, in front of the body, there are nozzles 7, 8 (Fig. 4-4b) for supplying the sorted product to the body. There is a distribution tray 9, which contributes to the even distribution of the product across the width of the sieves. The separator frame consists of front and rear struts connected by sidewalls. On the front pillar, there are branch pipes for supplying the product to the separator, equipped with viewing windows. A branch pipe for connection to the aspiration network is attached to the back of the frame. In order to prevent possible impacts of the body on the bed when starting and stopping the machine, a limiter 15 with a rubber shock absorber is attached to the lower rear connection of the bed. For this purpose, there are also two rubber stops, which are fixed on the front frame of the bed.

The pneumatic separation channel serves to separate light impurities from the product. It consists of a body with a movable wall inside. The movement of the lower and upper parts of the movable wall is provided by turning the handle. The air flow is regulated by a throttle valve using a knob. The movable wall is made of transparent material (or with a viewing window if the wall is opaque) for observing the separation process. For uniform feeding of the product into the pneumatic channel, a receiving box 19 with a tray is provided. Above, on the channel body, an adapter 20 is installed for connection to the air duct, under the channel there is a collector 17 for collecting refined grain. The distributor 8 is designed to divide the original grain into two identical streams, which ensures uniform grain distribution over the width of the separator sieves. Grain separation is provided by a movable valve with weights. The uniformity of the grain flow is regulated by the movement of the load on the hairpin.

The principle of operation of the separator is as follows. The product to be cleaned through the inlet pipe enters the distributor 8, from where it is divided into two streams with the help of the pipes 7 and directed to the body section.

ATTENTION! In order to avoid skewing of the body during operation, it is necessary to ensure a constant equal supply of grain to each stream. The separator body makes circular movements, under the influence of which the product moves along the sieve and is sorted. The body has an apron that reduces the possibility of grain entering the waste.

Large impurities are removed from the separator through trays 12, and the mixture of grain with small impurities passes through the sorting sieve to the lower frame of the sieves. Small impurities, waking up through the undersowing sieve, fall on the bottom of the separator, and then through the tray 13 are removed from the machine. The grain cleaned on sieves from large and small impurities enters the receiver of the pneumatic separation channel, from where it is fed into the pneumatic separation channel with the help of a tray in a uniform flow, where the product is intensively blown by the air flow. Fully cleaned grain is removed from the machine through the lower collector (17). Air from the body and the pneumatic separation channel is directed through the air ducts to the cyclone for cleaning from aspiration impurities.

Recommended installation diagrams of separators complete with aspiration equipment are shown in Fig. 7 and 7a. Separators can operate both in elevator (pre-cleaning of the product) and in mill (final cleaning) modes, depending on the types of sieves.

To clean the grain from impurities that differ from it in size, sieves with round, elongated or triangular holes, corresponding to the shape and size of the main crop grain and contaminating impurities, can be used in the separator. Recommended sizes and types of sieves are given in the appendix. The performance of the separator decreases with an increase in moisture and grain contamination.

The selection of sieves, in order to obtain the required degree of purification, is carried out by the consumer at the place of operation of the separator, depending on the original product and its properties (humidity, contamination, fractional composition, etc.).

Recommended characteristics reset (when cleaning different crops):

Name of culture	Elevator mode		Mill mode
	Sorting sieve	Underseeding sieve	Sorting sieve	Underseeding sieve
Wheat	Ø 10 ÷ 8	1,7…2 х 20 (16) Ø 2 ÷ 2,5	Ø 7 ÷ 5 3…4 х 20 (16)	1,7…2 х 20 (16) Ø 2 ÷ 2,5
Rye	Ø 10 ÷ 8	1,7…2 х 20 Ø 2 ÷ 2,5	Ø 7 ÷ 5 3…4 х 20	1,7…2 х 20 Ø 2 ÷ 2,5
Barley	Ø 10 ÷ 8	2…2,4 х 20 Ø 2,5	Ø 8 ÷ 4,5 4…4. 5х 20	2…2,4 х 20 Ø 2,5
Oats	Ø 10 ÷ 8	1,7…2,2 х 20 Ø 2,5	Ø 8 ÷ 6 3…4 х 20	1,7…2,2 х 20 Ø 2,5
Rice	Ø 10 ÷ 8	Ø 2,5 ÷ 3,5	Ø 6,5 ÷ 5,5 2,8…3,6 х 20	Ø 2,5 ÷ 3,5
Buckwheat	Ø 8 ÷ 7	2…2,4 х 20 Ø 3 ÷ 3,6	Ø 6 ÷ 5	2…2,4 х 20 Ø 3 ÷ 3,6
Millet	Ø 8 ÷ 6	1,4…1,6 х 20	Ø 4 ÷ 3 2…2,2 х 20	1,4…1,6 х 20
Peas	Ø 10 ÷ 8	2,7…4 х 20 Ø 5 ÷ 5,5	Ø 10 ÷ 8	2,7…4 х 20 Ø 5 ÷ 5,5
Sunflower	Ø 10 ÷ 8	1,7…3 х 20 Ø 3,5	Ø 10 ÷ 6	1,7…3 х 20 Ø 3,5
Corn	Ø 12 ÷ 10	3…5 х 20 Ø 6 ÷ 5,5	Ø 12 ÷ 10	3…5 х 20 Ø 6 ÷ 5,5

Note 1. If necessary, oblong holes can be replaced by round holes and vice versa, taking into account the formula:

В = (0,70 … 0,75)* d,

where B is the width of the oblong hole; d - hole diameter.

Note 2. To ensure the required degree of purification and obtain the required productivity, sorting and over-sowing sieves are selected by consumers individually during operation, since the geometric characteristics of the same types of grain crops may differ depending on the variety and growing area.

Contents of delivery:

Separators are supplied assembled.

Designation	Nomination	Quantity per one separator
БСХ- 3.00.000.	Separator	1
БСХ-3.11.000	Shim plate set	1
БСХ.РЭ	Manual	1
Equipment
БСХ-3.08.000	Key	1
Fast spare parts
	Frame kit	2
	Suspension kit	4
	Balls set	72
БСХ-3.00.036-А	Glass	1
БСХ-3.00.040	Sleeve	1
БСХ-3.00.090	Sleeve	1
БСХ-3.00.080	Sleeve	1

* At the request of the consumer, instead of the pneumatic separation channel, separators БСХ- 100, БСХ-16, БСХ-12, БСХ-6 can be supplied with an aspiration chamber БСХ -100.20.000 in the same quantity.