SU1384486A1 - Apparatus for automatic centering of endless belt - Google Patents

Abstract

This invention relates to conveyor technology. The purpose of the invention is to increase the reliability of work and increase the accuracy of centering by determining the magnitude of the displacement. To do this, in the device the controlling element was mounted with equilateral triangular cuts along the edges, and the tape alignment mode selection unit 13 was made in the form of three elements AND 18-20, two frequency dividers 21.22, and a serially connected clock sensor 23, the generator 25 pulses, one-shot 24. When the tape is mixed from the central position, and with it, the element from the output of sensors 5 or 6, the element 18 enters the -: signal, which prevents further signal passing in the absence of a signal at its first input connected with the output of the generator 25. The time during which the passage of a pulsed signal is allowed is determined by the frequency of the generator 25, which depends on the speed of the belt 1. When using the device, time is saved on commissioning works on centering the belt and its service life increases. 4 il. from € (L

Description

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The invention relates to devices for automatic centering of an endless belt and can be used in conveyors operating obliquely in vertical and horizontal planes, for example, in dielectric separators for separating quarantine weeds from seeds of cultivated plants in agricultural production, and can also be used in the food industry to sort cereals.

The aim of the invention is to increase the reliability of the device and increase the accuracy of centering by determining the magnitude of the displacement.

Fig, 1 shows the device, a general view; in fig. 2 - a fragment of the site of the controlling element; in fig. 3 - time diagram of the device; in fig. 4 shows the execution of a tape alignment mode selection unit.

The device consists of an endless belt 11, which surrounds the drums 2, the control element 3, placed along the generator tape 1 and made with equilateral triangular notches 4 along the edges, the sensors 5 and 6 control the position of the tape, mounted under the tape with the possibility of interaction with the control element 3 The tape contains an electrode system 7. The device also contains an electric drive 8 of the tape with a control unit, mechanisms 9 and 10 of the tension of the tape by reversible stepper electric drives 11 and 12, and a block 13 for selecting the alignment mode is flaccid. s. The reverse stepper motors 11 and 12 contain ratchet gears 14 and 15 with intermeshing hooks, traction electromagnets 16 and 17. The tape alignment mode selection unit 13 consists of three elements AND 18-20, contains two dividers 21.22 frequencies, serially connected clock setter 23, one-shot 24 and pulse generator 25, the outputs of which are connected to the first inputs of the first 18 and second 19 elements I. The outputs of the last through the corresponding frequency dividers 21 and 22 are connected to the traction electromagnets 16 and 17. Sensor output 5 comm nen to a first input of the third AND gate 20 and the second input of AND gate 18, the output of the sensor 6 is connected to the second inputs of

the second element I 1U and the third element I 2Q, the output of which is connected to the electric drive 8 connected to the inputs of the clock unit 23 and the single-oscillator 24.

In the ycTpoficTBa operation, three situations can occur: the tape is in a central position; the displacement of the belt from the central position by an amount not exceeding H up or down; the displacement of the tape from the central position by an amount greater than N.

Suppose the device is operating without displacing the tape from the central position. Despite the fact that the pulse generator generates signals to the elements AND of both control channels, the signal at their output is zero since the second inputs of the elements And do not receive signals from the sensors.

Suppose that after a certain period of time due to the complex effect of disturbing factors on the belt, it is displaced from the central position. When the tape is displaced by the value of h, and with it the controlling element 3, for example, downward, the sensor 5 generates pulse signals with a period T and a pulse duration t.

From sensor 5, the pulse signals are sent to the second input of an AND 18 logic element, which prohibits further signal passage in the absence of a signal at the first input connected to the output of the pulse generator 25. The time during which the passage of a pulsed signal is permitted is determined by the frequency of the pulse generator, which depends on the speed of the tape.

The signal from the element And 18 is supplied to the divider frequency 21, which reduces the frequency of the signal. Frequency divider 21 provides a signal to control a traction electromagnet, which through the ratchet mechanism 14 moves the support to the left.

With further displacement of the tape from the central position, for example by the value of h, the sensor 5 generates pulsed signals with the same period T, but a longer pulse duration equal to tj.

When the tape is moved up, the sensor 6 emits pulse signals, and

the second control channel operates in the same way as the first one, which leads to a shift of the support to the right.

In the event of the emergence of a regime of intensive slipping by an amount exceeding And due to the complex effect of perturbing factors, the controlling element is 3 cm | At the same time, there are two sensors 5 and 6, the signals of which are fed to both inputs of the element 20, which gives the command to turn off the electric drive 8 of the tape 1.

Using the invention saves time for adjustment work on centering the tape and cleaning the electrodes, extends the service life of the tape by eliminating edge wear, generally reduces operating costs and, consequently, increases productivity, increases reliability and accuracy of centering the tape.

Claims (1)

Invention Formula A device for automatic centering of an endless belt containing a controlling element placed along the generator of the tape with the possibility of interaction with datX / UXX / vU . / f  g I.3 j 1. J5 P1I tapes installed under Het (unit for selecting the mode of alignment of the tape, electric tape with a control unit, belt tensioning mechanisms with reversible stepped electric drives, which, in order to increase the reliability of the device and increase accuracy centering by determining the amount of displacement, the controlling element is made with equilateral triangular cuts along the edges, and the block for selecting the alignment mode of the tape in the form of three AND elements, two frequency dividers and About connected clock setter, one-shot, pulse generator, whose upstream is connected to the first inputs of the first and second elements I, the outputs of the latter are connected via frequency dividers to the corresponding traction electromagnets of reversing stepper drives, while the outputs of the sensors controlling the position of the tape are connected to the second inputs of the first and the second element And with the inputs of the third element And, the output of the latter is connected to the inputs of the clock unit and single-vibrator.  eight Phi2.1 FIG. Fi.Z