SU839915A1 - Conveyer belt slipping monitor - Google Patents

Description

(54) CONFESSIONAL CONTROL FOR SLIPPING OF CONVEYOR TAPE

The invention relates to the automation of conveyor transport and can be used to measure and control the slippage coefficient of conveyors and conveyors in animal husbandry and other areas.

A device is known for protecting a transport unit when a traction device slips, including a drive pulley rotation sensor, a traction train movement sensor and a LQ comparison unit.

The disadvantage of such a device is a large counter volume and a long monitoring time.

It is also known a device for controlling the slippage of the belt and conveyor, comprising pulse sensors for moving the belt to the outer surface of the driving drum, connected to the pulse shapers, a delay unit, a decoder counter, a logic and execution unit, and an indication unit fzj.

However, the known device has low accuracy and low speed.

The purpose of the invention is to increase the accuracy and speed of control.

The goal is achieved by the fact that the device is equipped with a frequency clever connected between a pulse shaper of a belt displacement sensor and one of the counter inputs, while the output of the pulse shaper of a displacement sensor of the outer surface of the driving drum is connected to the input of the delay unit and one of the logic block inputs.

FIG. 1 shows a functional diagram of the device; in fig. 2 timing charts of the device.

The device comprises toothed discs 1 and 2, kinematically associated with the drive drum of the conveyor and the conveyor belt, respectively; sensors 3 and 4 tags; shapers 5 and 6 pulses; Delay counter 8, a decoder 9, a logical 10, and an executive II block, connected in series 7, as well as an indication block 12 connected to one of the decoder 9's output, and a frequency multiplier 13 connected between the output of the short p and the other input, counter 8. The outputs of the sensors 3 and 4 tags, connected, respectively, to the inputs of the formers 5 and 6 pulses. The output of the pulse shaper 5 is connected to the inputs of the delay unit 7, the logic unit 10 and the decoder 9 Disk 1 has 10 times fewer teeth than the disk 2, and is mounted on the shaft of the drive drum. The teeth are evenly spaced around the circumference of the disks. The disk 2 is mounted on the shaft of the bypass roller in contact with the inner surface of the conveyor belt, and the diameter of the bypass roller is equal to the diameter of the drive drum.

The device works as follows.

During normal operation of the conveyor (i.e., the tape does not slip), the disks 1 and 2 rotate and, with their teeth, act on the sensitive elements of the sensors 3 and 4 marks. The signals from sensors 3 and 4 arrive at shapers 5 and 6 pulses, at the output of which they take the form of short pulses (FIGS. 2, a and b, respectively). The number of pulses corresponds to the number of teeth that have passed the tag sensor. The time interval between two adjacent pulses from the imaging unit 5 (Fig. 2a) determines the cycle of operation of the device. Since the number of teeth on disk 1 is 10 times less than on disk 2, in the absence of slippage between the two pulses from the driver 5, there are 10 periods of the pulse signal from the former 5 (figure 2 a and b, first cycle). The signal from the output of the imaging unit 6 to the input of the counter 8 is supplied through the frequency multiplier 13. When the multiplication factor is 10, the period of the pulse signal. With the output of the former 6 is divided by frequency multiplier 13 into ten equal parts (Fig. 2, c), which allows

to determine the fractional parts of the period of the signal from the imager 6 with an accuracy of 0.1, the impulse coming from the imager of 5 pulses

to the inputs of the decoder and logical block, reads the result of the measurement of the slip coefficient on the display unit 12, where it is displayed during the next cycle, as well as

reads the decision made by logic unit 10 to execution unit 11, which processes it during the next cycle. In addition, the same pulse through block 7

Delay sets in the counter 8 code corresponding to the number 100 (Fig, 2, g). The delay time does not exceed half the period of the signal from the output of the multiplier 13 frequency. After

setting the counter in the number I00 starts the next measurement cycle, during which the pulses coming from the output of the frequency multiplier 13 to another input reduce the recorded number. In the absence of slippage from the multiplier 13, the frequency receives 100 pulses (FIG. 2, g the first cycle), and in the presence of slipping (FIG. 2, g, the second cycle)

the number of pulses is less than 100.

Thus, at the end of the first cycle, the counter code corresponds to the number O, and at the end of the second cycle to the number 25. That is, in the first cycle in

the reference time interval contains 10 periods of the pulse signal from the output of the imaging unit 6, and in the second cycle only 7.5 periods, with half of the eighth period

determined by dividing it

frequency multiplier by ten equal parts.

 In the device, the accuracy of determining the coefficient of slippage depends on

from the multiplication factor of the frequency, and in comparison with the known accuracy is increased by 10 times with the same measurement time and the multiplication factor of the frequency multiplier, equal to 10.

With a multiplication factor of 100, moreover, the speed is increased by 10 times, since it takes ten times to deliver 100 pulses from the frequency multiplier to the counter.

less than the reference time interval.

Claims (2)

1. Author's certificate of the USSR 462776, cl. B 65 G 43/04, 1975. 2. Authors certificate of the USSR 1 508449, cl. B 65 G 43/04, 1976.