SU399721A1 - DEVICE FOR ACCOUNTING OF AREA TREATED BY A TRACTOR UNIT - Google Patents

Description

one

This invention relates to a measurement technique used in agriculture.

A device is known to take into account the area treated by the tractor units, which contains a displacement and aggregation sensor, a set width gauge for working bodies of the aggregate, a position sensor for operating ortans, and a control unit connected to the sensor.

In the known device, the increment magnitudes of the displacement obtained from the displacement transducer are combined and multiplied by the grip width with the help of mechanical units. Moreover, the unit displacement sensor is made in the form of a mechanical transducer of rotation of the driven gear of the tractor's final n-transfer into Linear movement, the control width setting unit is in the form of a mechanical node, and the control device is in the form of an electromagnet and serves to connect the displacement sensor.

Connecting the unit displacement sensor with the Veda gear of the final transmission of the tractor reduces the accuracy of the device during skidding and the inability to load the tractor engine. In addition to this, the known device is difficult and unreliable due to the presence of a large number of mechanical components and the absence of protection from mechanical overloads.

The proposed device is characterized in that it is equipped with a speed sensor assembly, made in the form of a tachogenerator connected to a displacement transducer made as a measuring 1 wheel on a reducer, setting the circumference of the measuring wheel, iB type of potentiometer, multiplication unit. speeds to the width of the grip, the integration node, made in the form of an integrating electrovitatel (I, editor | and rev counter. The setting width of the grip is lined. in the form of a potentiometer, the control node is in the form of a relay that is activated during the working stroke of the unit, the multiplication unit - in the form of a voltage divider composed of successively connected a circle-length setting potentiometer and measuring wheel, alternating resistors and a capture width setting potentiometer. Integrating electric motor connected to you. and multiplying via relay contacts of the control unit and the input node is coupled to multiplying vhodom speed sensor.

This improves the accuracy of measurements and at the same time simplifies the device and improves its reliability.

The drawing shows the electrical circuit of the proposed device.

It is with, a sensor of a lerameshen unit, made in the form of an impeller wheel 1 and a reducer 2; airperaTa speed sensor, made in the form of tachogenerator 3; the unit of circumference and the measurement of 1 wheel 1, made in the form of (Potentiometer 4 with L; im1bam 5; unit of shtsr.ina capture of the working parts of the unit, made in the form of potentiometer 6 with limboim 7; node multiplying the width by the width of the gripper, filled in the form of a divider stress composed of a potential meter 4, variable resistors 8, 9 and potentiometer 6; an integration unit made in the form of an integrating electric motor 10, a gearbox 11 and a counter 12 revolutions; a sensor 13 of the position of the working parts of the unit and connected to the control Node for switching on the device during the course of the unit, made in the form of a relay 14 with a switching contact 15 and a power supply source.

If a tachogenerator 3 of alternating current is applied, then the output of the speed sensor is set to 17 s, IllO: m, which, for example, is a voltage divider made up of potentiometers 4 and 6, resistors 8, 9, and a capacitor 18 .

If a DC generator 3 is used, the rectifier 17 and the filter are not needed.

To measure the speed of movement of the attribute, an electrical measuring switch 19 can be installed, switched on: at the output of the speed sensor, for example, via a jRC-chain consisting of a resistor 20 and a capacitor 21.

For thermocompensation at the output of the multiplication unit (Thermistor 22 can be installed.

The integration unit can be equipped with a protective device 23, for example, a fricdion, which serves to protect the integrating motor 10 in the event of an overload in the gearbox and the rev counter.

The tachometer 3 is connected to the sensors of the transducer (Exchange, integrating the electric motor 10 - with the output of the multiplication unit through the switching contact 15 of the relay 14 and, for example, through the thermistor 22. The input of the multiplication unit is connected to the output of the speed sensor, eg, output from the output terminal 17.

As the measuring wheel 1 can be used one of the wheels of the tractor unit, for example the plow wheel.

The device works as follows.

Before starting the processing by the tractor unit of the considered section of the area and potentiometer oOM 4 with the help of limb 5, the known value of the circumference of the measuring wheel 1 is set, by means of the potentiometer 6 by means of Lim.ba 7 is known. The value of the width of the grip of the working bodies of the tractor unit.

When idle | M during the tractor A. unit, its workers or / gans are lifted, i.e. is located in the transport position. The sensor is a sensor 13 and a relay 14 is switched off, and the switching

(Contact 15 closes on the short side of the motor 10, as a result, the device does not keep track of the area at idle speed of the tractor unit.

During the operation of the tractor unit, its working bodies are lowered, which causes the sensor 13 and the relay 14 to turn on. In this case the contact 15 of the relay 14 switches the electrode winding in the needle 10. And connects it to the output of the multiplication unit, for example, through a thermistor 22. The measuring wheel 1 rolls over the soil, its rotation through the reducer 2 is transmitted to the oscillator w shaft, which produces, for example, a generator. proportional to the speed of rotation of the measuring wheel 1, and, consequently, the speed of movement of the tractor unit. The resulting voltage Uo, for example, through rectifier 17 is applied to the input of the multiplication node:

(one)

gde w - angular velocity of the measuring wheel 1, / Co - constant.

The multiplication unit converts the angular velocity from the inner wheel 1 to the linear speed V of the tractor unit, taking into account the given radius 4 of the measuring wheel 1 to potentiometers 4, and multiplies the speed V by the width H of the gripping parts of the tractor unit. The reduction and multiplication output will be

i / o

.

Tt h

(2)

K + R, + RS + R

where R: ,, Rs, Rs, Ra are the resistances of potentiometers 4, 6 and resistors 8 and 9, respectively; Rn is the resistance of the divider between the movable 1 pin of the p. 6 potentiometer and the earth fault. And

R ,, K:, - H, (3)

where / d is a constant, I is the width of the working bodies. O. we denote

, + R, + R2 const (4)

Then the radius r of the measuring wheel can be found from

, + / / S, -g, (5)

where Kz is a constant.

Substituting (1), (3), (4), (5) into (2), we get

TO,

and,

K, -H K, -V-H,

(6) K, g

TO

const. TO,

y ju

linear speed tractor agg regatta.