SU1265130A1 - Device for measuring escalator braking distance - Google Patents

Abstract

A DEVICE FOR MEASURING A BRAKING WAY OF THE ESCALATOR, containing an input converter having an inductive sensor connected to a pulse shaper, connected in series with the main differentiating unit, the output of which is connected to the first direct input of the first logical element OR, the inverse input connected to the direct output of the time delay block whose inverse output is connected to the first input of the second logical element OR, and the inputs are connected respectively to the generator outputs rectangles pulses and start trigger, pulse counter of the input converter, one input of which is connected to the output of the first logical element OR, and the setup input - to the installation input of the counter of the output unit, including the decryptor and indicator, and the output of the starting trigger, the setup output is connected to the second input of the second logical element OR, characterized in that, in order to increase measurement accuracy, it is equipped with a counter with a variable counting factor and additional input converters, with In this case, each input converter is equipped with an inverter and a differentiating unit connected in series with it, connected between the pulse shaper and the first logic element OR, besides, a counter with a variable counting coefficient is connected by a counting input to the output of a square pulse generator, and a setting input to the output of the second logic element OR, one output - to the counting input of the output block counter, and another output - to another input of the pulse counter of the input converter, which is flax reversible.

Description

The invention relates to iodine-transport equipment and can be used primarily in the process of routine maintenance of metro escalators for measuring their stopping distance.

The purpose of the invention is to increase the measurement accuracy.

Fig. 1 shows a functional diagram of a device for measuring the stopping distance of an escalator; figure 2 - inductive sensor; in FIG. 3, view A in FIG. 2.

Inductive sensors 1 and 2 are connected to the formers 3 and 4, loaded on the main differentiating units 5 and 6 and inverters 7 and 8, connected to additional differentiating units 9 and 10. The first logical element OR AND, the direct inputs of which are connected to the outputs of differentiating units, loaded on the reversible counter 12 pulses of the input converters. The generator 13 of rectangular pulses is connected to the counting input of the counter 14 with a variable counting coefficient, the output of which is connected to the counting input of the counter 15 of the output unit including the decoder 16 and the indicator 17. The time delay unit 18 is connected to the second logic element OR 19.

A device for measuring the stopping distance of an escalator works as follows 1, in its own way.

When the escalator is stopped, the signal coming from its control circuit to the input of the Start Trigger Stop 20 sets the latter to a state allowing the operation of the time delay unit 18. At the same time, there are no signals at the output of inductive sensors 1 and 2 installed at a distance of 5-6.6 mm from the side surface of the teeth of the traction sprocket, and therefore the reversible counter 12 is in the zero position. The signal from its zero output through the second logical element OR 19 sets the counter 14 with a variable counting factor to the zero state.

When the escalator is started up at the input of the Start Trigger 20, a signal from the Escalator control circuit appears that sets the trigger 20 to the state prohibiting the operation of the time delay unit 18. In addition, the signal from the output of the trigger 20 sets the reversible counter 12 and the counter 15 of the output unit to the zero state, and the signal from the inverse output of the time delay unit 18 through the second logic element OR 19 sets the zero position to the zero position 14 with a variable counting factor. The signal from the direct output of time delay unit 18 permits the operation of the first logic element OR 11. Thus, when the escalator moves, the signals of the inductive sensors 1 and 2 through the first logic element OR 11 arrive at the reversing counter 12, but are not recorded into it, because the work is prohibited by the signal from the trigger 20.

When a signal appears at the input, the Stop state of the flip-flop 20 is reversed and the signal of the porta is taken from the counters 12 and 15 and the time-delay unit 18. As the escalator continues to move, the pulses from the formers 3 and 4 of the inductive sensors 1 and 2 begin to be underperformed by the counter 12. The period of the pulses of the inductive sensors is proportional to the pitch of the teeth.

g Since the counter 12 responds only to one edge of the pulses, the error in measuring the stopping distance can be equal to the pitch of the teeth of the traction sprocket till (Fig. 2). The measurement accuracy in the proposed device is enhanced by

0 insertion of additional differentiating units 9 and 10 in each pulse shaping channel, which, in the presence of inverters 7 and 8, allows to take into account a given pulse edge. Measurement accuracy is also enhanced by the introduction of an additional input converter. If the two input converters (Figures 1 and 2) are located 1/4 the distance from each other, then the norpenjHocTb measurement can be 1/4 tin. Thus, the required measurement accuracy is achieved by introducing into the device a corresponding number of input transducers.

Simultaneously with the appearance of the signal at the “Stop Trigger 20” input, the time delay unit 18 starts counting the time delay. The zero output state of the counter 12 is reversed, thereby removing the prohibition on the operation of the counter 14, which, however, is held in the inhibited state by a signal from the inverse output of the time delay block 18. When the time delay unit 18 is triggered, the signal from its direct output inhibits the operation of the first logic element OR 11, and the signal from the inverse output enables operation of the counter 14. The latter starts to fill 5 pulses from the generator 13 rectangular pulses. The signal from the output of the counter 14 is fed to the input of the counter 15 and the subtracting input of the counter 12. When the counter 12 comes to zero, the signal from its output prohibits the operation of the counter 14. The state of the counter 15 is decrypted by the decoder 16 and reflected on the indicator 17.

Thus, the use of a counter 14 2 with a variable counting coefficient makes it possible to use it without alteration in different types of escalators having different tm values of a sprocket. i

The presence of a reversible counter 12 gives pax due to the transfer of each deducted

the ability to carry out the indication of the torus pulse in the appropriate amount

direct path in millimeters-millimeters.

1265130

FIG. 2

In id

five

.З

Claims (1)

DEVICE FOR MEASURING THE BRAKER WAY OF THE ESCALATOR, comprising an input converter having an inductive sensor connected to a pulse shaper, connected in series with the main differentiating unit, the output of which is connected to the first direct input of the first logical element OR, inverted input connected to the direct output of the time delay unit, inverse the output of which is connected to the first input of the second logical element OR, and the inputs are connected respectively to the outputs of the generator of rectangular impu xy and a start trigger, a pulse counter of the input converter, one input of which is connected to the output of the first logical OR element, and the installation input is connected to the installation input of the output block counter, which includes the decoder and indicator, and with the output of the start trigger, the installation output is connected to the second input of the second logical element OR, characterized in that, in order to improve the accuracy of measurement, it is equipped with a counter with a variable counting coefficient and additional input converters, each the input converter is equipped with an inverter and a differentiating unit connected in series between the pulse former and the first logical OR element, in addition, the counter with a variable counting factor is connected by the counting input to the output of the rectangular pulse generator, and the installation input is connected to the output of the second logical OR element, one output - to the counting input of the counter of the output unit, and another output - to another input of the pulse counter of the input converter, which is made reversible m (/) φ »ζ.1 1265130 A1