RU2607456C1 - Drive cassettes with brushes for cleaning of sieve surface - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention relates to agricultural machine building and can be used in cleaning and sorting of grain. Cassettes’ drive with brushes for cleaning of sieve surfaces comprises rod, ratchet wheel and spring-loaded retainer. Cassettes with brushes are connected by yokes to connecting rods on crankshaft. Double-arm lever is freely mounted on crankshaft. One end of lever by means of rod is articulated with sieve box. Second end of lever together with spring-loaded retainer is in contact with ratchet wheel, rigidly fixed on crankshaft.

EFFECT: drive device provides increased reliability of cleaning of sieves.

1 cl, 3 dwg

Description

The invention relates to the field of agriculture, in particular to a technique for cleaning and sorting grain.

Grain-cleaning machines are known in which brush sieve cleaners are used, which receive movement from oscillations of the sieve mill. The disadvantage of such cleaners is the difficulty of adjusting the force between the brushes and the sieve, the violation of smoothness and insufficient cleaning of the sieves from stuck grains [1].

Brush cleaners are also known for cleaning four rows of sieves, the carriages of which receive movement from a single crank shaft, a system of two-arm levers, rods, sliders. Such cleaners are used in serial machines ZVS-20, OVS-25, SM-4 and others. The disadvantage of such cleaners is high metal consumption, low reliability and the possibility of jamming mechanism [1, 2].

The closest technical solution to the proposed invention is a drive unit for cartridges with brushes for cleaning four rows of sieves, consisting of several (two or four) crank shafts and connecting rods. Crank shafts receive movement from an electric motor, a belt drive, a gearbox, a crank mechanism, a system of levers and intermediate links [3].

The disadvantage of such a drive device is the complexity and bulkiness of the mechanism, the rapid wear of the articulated joints in the transmission system of movement from one shaft to another.

The aim of the invention is to increase the reliability and simplify the design of the drive unit of the cassettes with brushes by transmitting movement to the carriages with brushes from vibrations of the sieve mill.

This goal is achieved by the fact that the cassettes with brushes are connected by means of a rocker arm to the connecting rods, worn on one vertical crank shaft, on which the two-arm lever is freely mounted. One end is pivotally connected to the sieve mill by means of a thrust, and the other end, together with a spring-loaded clamp, is in contact with the ratchet wheel, which in turn is rigidly fixed to the crank shaft. Comparative analysis with the prototype shows that the inventive drive device is characterized in that the cassettes with brushes are connected by means of a rocker arm to the connecting rods mounted on one vertical crank shaft. Thus, the claimed drive device meets the criterion of "novelty."

In addition, a two-arm lever is freely set on the crank shaft, one of its ends is pivotally connected to the sieve mill, and the other end, together with the spring-loaded clamp, is in contact with the ratchet wheel, which in turn is rigidly fixed to the crank shaft. This allows you to convert the vibrations of the sieve mill in the rotational movement of the crank shaft, and then in the reciprocating movement of the cassettes with brushes. In this case, there is no need to use an expensive electric motor, belt drive, gearbox and many articulated joints. This allows us to conclude that the claimed drive device meets the criterion of "significant differences".

In FIG. 1 shows a front view of the sieve part of a grain cleaning machine. In FIG. 2 shows a section AA of the upper sieve mill. In FIG. 3 shows a cross-section BB on the ratchet wheel. The sieve mills 1 receive oscillatory movement from the eccentric-connecting rod mechanisms 2. Inside the sieve mills 1, the sieve sheets 3 are fixed, and under them are mounted on the guides cassettes 4 with brushes 5. Rockers 6 are pivotally attached to the cassettes 4, which can be rotated in a vertical plane. The connecting rods 7 are pivotally attached to the rocker arms 6, the heads of which are mounted on the crank shaft 8. A two-arm lever 9 is freely mounted on the crank shaft 8, one end of which is pivotally connected to the sieve mill 1 by means of a link 10. A latch 11 is installed on the second end of the two-arm lever 9, which spring 12 is pressed against the ratchet wheel 13, rigidly mounted on the crank shaft 8.

The operation of the drive unit cassettes with brushes for cleaning sieve cloths is as follows. When moving the eccentric-connecting rod mechanisms 2 sieve mills 1 receive an oscillatory movement. Together with the sieve mill, the oscillation is performed by a rod 10 attached to it, which transmits the oscillations to the two-arm lever 9, freely set on the crank shaft 8. When the sieve mill moves, for example, to the right, the two-arm lever rotates clockwise. The latch 11 under the action of the spring 12 is lowered into the cavity between the teeth of the ratchet wheel 13 and rotates it together with the crank shaft 8 clockwise. Cranks 7 mounted on the crank shaft through the rocker arms 6 move the cartridge 4 along with the brushes 5 along the sieves 3. The pile of brushes pushes the stuck grains out of the holes of the sieves 3.

The crank shaft 8 is located vertically, and the sieve mills 1 and cassettes 4 with brushes 5 are located at a certain angle to ensure the movement of grain along the sieves. As a result of this, the cartridges 4 with brushes 5 at the beginning and end of the stroke occupy different heights, which can cause additional pressure on the connecting rods and brushes. Therefore, to compensate for the height of the cartridges 4, the rocker arms 6 are introduced into the drive unit.

In existing grain cleaning machines, sieve mills oscillate with a frequency of 400 ... 500 vibrations per minute. Cassettes with brushes oscillate at a frequency of 30 vibrations per minute. One stroke of the cassette with brushes takes place in 13 ... 15 vibrations of the sieve mill. From these values determine the number of teeth z of the ratchet wheel of the proposed device. Assume z = 16. Sieve mills oscillate with an amplitude of A = 7.5 mm, and the amplitude of oscillation is 2A = 15 mm. Taking into account the stock, we take the pitch of the ratchet wheel t = 16 mm. Then the diameter of the ratchet wheel is D ° ≈82 mm. In existing machines, the oscillation amplitude of the cassettes with brushes is 117.5 mm. In the proposed device, such an amplitude of oscillations of the cassettes with brushes is provided by the radius of the crank shaft 8.

Information sources

1. Gortinsky VV, Demsky AB, Boriskin M.A. Separation processes in grain processing enterprises. - M .: Kolos, 1973. - p. 215, 219.

2. Onikin B.S., Gorbachev I.V., Terekhin A.A., Soloviev V.M. Machines for post-harvest grain processing. - M .: Agropromizdat, 1986. - p. 32.

3. Stationary grain cleaner OZS-50. Operation manual OZS-50/25/10 RE. - Voronezh: OJSC GSKB Zernoochistka, 2000.

Claims (1)

The drive device of the cartridges with brushes for cleaning the sieve cloths, which includes a crank shaft, connecting rods, rocker arms, traction, a ratchet wheel, two shoulders lever and a spring-loaded clamp, characterized in that the cartridge cartridges with brushes are connected to the connecting rods mounted on the crank shaft, on which a two-arm lever is freely set, one end of which is pivotally connected to the sieve mill by means of a rod, and the other end, together with a spring-loaded lock, is in contact with a ratchet wheel rigidly fixed to the crank Mr. shaft.

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