RU1806533C - Device for studying parameters of engagement of doffing brush and picker spindle - Google Patents

Abstract

Usage: agricultural engineering. SUMMARY OF THE INVENTION: At the top end of the test spindle, a spindle section is reinforced, and an additional brush with tufts of conductive material is fixed at the top end of the brush puller. When the beams move, they come into contact with a spindle segment, which

Description

recorded on a galvanometric oscilloscope. On the latter, the angular displacement of the spindle segment is also recorded in the form of pulses

the passage of the pins associated with the spindle length between the jaws of the inductive sensor associated with the axis of the spindle drum. 2 ill.

The invention relates to the field of agricultural engineering and can be used to study the interaction parameters of the puller brushes and the spindle of the drum of a cotton picker

The purpose of the invention is to improve the accuracy of the measurement results of the interaction parameters of the spindle-brush puller,

Fig. 1 schematically shows a schematic diagram of a device for examining the interaction parameters of the stripper brushes and the cotton drum spindle; figure 2 - fragments from the oscillograms of the parameters of the interaction of the brushes of the puller and the spindle.

A device for studying the interaction parameters of the stripper brushes and the spindle of the cotton picker includes a housing 1 mounted on the last spindle drum 2 with the spindle 3 to be studied and a brush puller 4, a metal brush isolated from the shaft 5 of the puller 4 is fixed on the shaft 5 of the puller 4 6 is identical in shape to the puller 4, the bundles 7 of which consist of a thin steel wire whose elasticity is close to the elasticity of the fibers of the brushes 8 of the puller. The metal brush 6 is connected in series through a current collector 9 located on the upper end of the shaft 5. of the puller 4, micro-power supply 10, one of the loops 11 of the oscilloscope galvanometer with the housing 1 of the device. On the upper end of the spindle 3 under investigation, a spindle 12 segment coaxially fixed is installed, identical in shape to the spindle 3 under investigation. The pins 13 are fixedly located on the side surface 14 of the spindle 12 segment at equal angles and lie on the same plane perpendicular to the axis of the spindle segment 12 pass between the jaws 15 and 16 of the inductive sensor, which is stationary relative to the spindle 3 under investigation and rotates together with the spindle drum 2, and one jaw 15 of the inductive sensor is connected through a current collector 17, fixed mounted coaxially on the shaft 18 spin-

a single drum 2, another of the loops 19 of the oscilloscope 20, with another sponge 16.

The device operates as follows.

During the operation of the cotton picker, at each contact, the beam 7 of the metal brush 6 and the spindle length 12, the electric circuit closes, and in other cases it is in the open state, The time the electric circuit is in the closed state in the form of signals is fixed on the oscilloscope film, which reflects the contact time of each beam with the surface of the spindle. The figure described by the bunny on the tape of the oscilloscope, when the electric circuit is closed, is an isosceles trapezoid AVSD, which is shown in enlarged view in Fig. 2.

At the moment of contact of the beam 7 with the lateral surface 14 of the spindle segment 12, the bunny of the oscilloscope instantly deviates from the neutral position A by the distance From and takes the position B, while describing the direct AB, further, depending on the contact time, it is at a distance distant from the initial position and describes a BC line parallel to the neutral line. When the beam 7 is finally separated from the side surface 14 of the spindle segment 12, the bunny takes its initial position (neutral), while describing the direct LED.

Therefore, when processing the waveform, the information necessary for calculating the information is the distance AC1.

From FIG. 2 it is also easy to notice that the accuracy of the results increases with increasing speed of the oscilloscope tape during oscillography. From the waveform, the contact time of each beam 7 with the side surface 14 of the spindle segment 12 is determined as

AC1 Vfl

(with)

where V / i is the oscilloscope tape speed, mm / s. Number of trapezoids

by the traces left by the bunny, shows the number of strokes of the beams 7 of the metal brush b on the side surface 14 of the spindle section 12 during the interaction.

The device also allows you to take into account the angle of rotation of the spindle 12 about its axis when exposed to the beams 7 of the metal brush 6. For this purpose, on the side surface 14 of the spindle 12 at the same angles

at

2-n

(glad),

(where Z 4, the number of pins 13), the pins 13 are fixedly located lying on one plane perpendicular to the axis of the spindle 12. These pins 13, when the spindle 12 is rotated, alternately pass between the jaws 15 and 16 of the inductive sensor and excite the emf in it. which in the form of a signal through the current collector 17 enters another loop 19 of the oscilloscope 20 and is fixed in the form of peaks on the film. The distance h between each peaks of the obtained waveform represents the rotation of the spindle 12 by an angle y in scale.

tsul1l / t. / happy h MMJ

Expression

S // y A C - rh (mm)

determining the arc length of the circumference of the spindle 12 section being machined by one of the bundles 7 of the metal brush 6; where rh is the radius of the spindle 12;

AC1 - AC segment, measured in mm.

The use of the proposed device in the study of the interaction parameters of the brush of the puller and the spindle of the drum of the cotton-picking apparatus increases the accuracy of the measurement results of the parameters of the interaction of the spindle-brush puller.

5 10

15 0 5

0

5

0

5

According to the proposed technical solution, an industrial installation was manufactured. which was introduced in GSKB on cotton growing machines since September 1990 and is used in experiments.

Claims (1)

SUMMARY OF THE INVENTION A device for investigating the interaction parameters of the stripper brushes and the drum spindle of a cotton picker, comprising a housing, a spindle drum with a test spindle mounted on the housing, a brush puller and means for registering the interaction of the latter, characterized in that, in order to improve the accuracy of the measurement results, the interaction registration means spindle and brush puller has a spindle segment, rigidly mounted on the upper end of the studied spindle coaxially with the last and having a diameter equal to the diameter of the spindle under study, an additional brush rigidly mounted on the shaft of the brush puller and electrically isolated from the latter, an inductive sensor, a power supply unit and a galvanometric oscilloscope, while the parameters of the additional brush correspond to the parameters of the brush of the puller, and the beams are made of conductive material, moreover, on the side surface of the spindle segment, the pins are placed in a horizontal plane at equal angles to its axis, with the possibility of their movement between the jaws an inductive sensor mounted motionlessly relative to the spindle drum, in addition, the outputs of the inductive sensor through a corresponding current collector are connected to one of the plume of a galvanic oscilloscope, another loop is connected to the housing, as well as through a power supply unit and another current collector mounted on the upper end of the puller shaft - with bunches of additional brushes, the latter being placed with the possibility of interaction with the lateral surface of the spindle segment. Fi g