SU1491381A2 - Ensilage harvester - Google Patents

Abstract

The invention relates to agricultural machinery, in particular, to devices for introducing liquid additives into green fodder directly during mowing, and it allows to improve the accuracy of dosing of these additives. The forage harvester contains a silo line 1 and a device for adding liquid additives to the cleaned mass of feed on the outer wall of the silo line with a mass sensor in the form of a two-support plate, closed from the inside of the pipeline by a tape of elastic material, from the outside a cover. The cavity under the lid is connected by a pipeline with an ejector tube installed in the pipeline opposite the mass sensor. The weight of the feed moving along the silo duct 1 due to the presence of centrifugal force on the curved portion of the silo duct presses against the double-support plate 2 of the strain gauge and bends it. In addition, the vacuum created in the ejector tube 8 located in the silo duct is transmitted into the hermetic cavity 6 above the sensor and also bends the plate. The total deflection is quasi-linear to the amount of feed passing through the silage duct. 3 il.

Description

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The invention relates to agricultural machinery, in particular, devices for introducing liquid additives into green fodder directly during mowing, and is an improvement of the invention in accordance with the author. No. 1214009.

The aim of the invention is to improve the accuracy of dosing.

FIG. Figure 1 shows the combine silo line, longitudinal section; in fig. 2 is a view A of FIG. 1 (without cover); in fig. 3 — graph of transfer function; mass of passing feed — plate deflection.

The forage harvester contains a silo line 1 and a device for adding liquid additives to the harvested mass of feed (not shown). The mass sensor of the passing feed is installed on the curvilinear section of the pipeline 1 and consists of a two-support plate 2 with glued on it

strain gages 3, forming a measuring bridge, which is electrically connected to the control unit of the device for introducing liquid additives. On plate 2 (along the perimeter) and on the outer wall of the silo duct

1 glued sealing tape 4 and an elastic material, for example rubber. From the outside of the silo duct 1, the mass sensor is closed with an airtight lip 5, forming an airtight cavity 6. Between the cover 5 and the plate

2installed damping pads 7, made, for example, of porous rubber. Inside the silo duct, on its inner radius, opposite to the mass sensor, an L-shaped ejector tube 8 is installed, facing with the open end to the outlet of the silo duct 1. This tube is connected to the hermetic cavity 6 by means of the duct 9.

Silage harvester works as follows.

The mass of feed, the passage along the curvilinear section of the silo duct 1, under the influence of centrifugal force, bends the plate 2 by the value Y, determined by the expression:

Y, m-f (V2, p, g, c, b, h, c /, E, 1), where m is the amount of feed mass, kg; V is the velocity of the mass,

m / s;

p is the radius of curvature of the curvilinear section of the pipeline, m

Q

15

20

25 Q

35

40

45

50

55

g 9,81

b, h, f - geometrical dimensions of the plate, m;

E, 1 is the modulus of elasticity of the plate material at the moment of inertia of its cross section. The transfer function f (V, o, g, o, b, h, cf, E, 1) is non-linear (Fig. 3, curve I).

During the operation of the chopping unit of the combine, a powerful air flow is created in the silo duct (speed of about 25 m / s), as a result of which a vacuum is created in the ejector L-shaped tube 8. At the same time, the larger the cross section of the silo pipe 1 is occupied by the mass of the transported feed, the more rarefied this vacuum is. The vacuum is transferred through conduit 9 to the hermetic cavity 6 and bends the plate 2 by the value of Y. The transfer function is the rarefaction (i.e., the amount of feed mass) —the bend Y is also non-linear, but along an ascending curve II (Fig. 3). The total deflection Y Y + Y of the plate 2 on the feed pressure on it and on the negative pressure is almost linearly dependent on the mass of the feed passing through the silo pipe (curve III, fig. 3). The strain gages 3 convert the deflection of the plate 2 into an electrical signal, which through the control unit acts on the device for introducing liquid additives.

The selection of the physical characteristics of the plate, the ejector tube and the sealed chamber achieve the maximum linearity of the total transfer function. The linearity of this function greatly simplifies the subsequent taring of the mass sensor and improves the accuracy of dosing of additives added to green fodder.

Claims (1)

Invention Formula Forage harvester by bus. St. No. 1214009, characterized in that, in order to improve metering accuracy, a sealing tape made of an elastic material, a weight sensor, is closed outside the lid, forming a sealed cavity, which is connected to an ejector tube by a pipe, on the outer wall of the silo duct. installed in the silo pipe opposite the mass sensor and facing open end to the silo outlet. Vida one 3fig. 2 L Nassau passing fig.d