SU1703520A1 - Device for measuring escalator braking distance - Google Patents

Abstract

The invention relates to a measurement technique, and more specifically to a device for measuring the braking performance of an escalator, and can be used in the process of routine maintenance of escalators. The purpose of the invention is to increase accuracy and reliability. The device for measuring the stopping distance of an escalator contains a track sensor 1 located in the region of the escalator's traction circuit, the pulses from which are fed through galvanic isolation unit 2 to the EXCLUSIVE OR element 3, from which the pulses go to the meter 6 of the escalator and delay unit 5 as well as to one of the inputs of the element AND-NOT 4. moreover, when the escalator is in operation, the delay unit 5 is located in. state, prohibiting the operation of the threshold unit 11. When you stop the escalator to the input element AND-NOT 4 receives a signal that permits its operation. At the same time, at the output of element 4, pulses from sensor 1 appear. After the escalator is completely stopped, a signal arrives at block 11 to allow its operation. In block 11, the counting pulses are received from one of the bits of the counter 7. The track sensor 1 makes it possible to output pulses with a frequency that provides the required measurement accuracy. 1 il. . ate with

Description

The invention relates to measuring equipment, and more particularly to a device for measuring the braking characteristics of an escalator, and can be used in the process of routine maintenance of escalators.

The purpose of the invention is improving accuracy and reliability.

The drawing shows a functional diagram of a device for measuring the braking distance of an escalator.

The device for measuring the braking distance of the escalator contains a track sensor 1 connected to a galvanic isolation unit 2, the output of which is connected to one of the inputs of the EXCLUSIVE OR 3 element, and its output is connected to the first input of the AND-NOT element 4. delay unit 5 and mileage counter 6 escalator. The output of element 4 is connected to a pulse counter 7 and to an EXCLUSIVE OR 8. element whose output is connected to the input of the indicator switching unit 9, and the output of the indicator switching unit 9 to the input of the indication unit 10. The output of the delay unit 5 is connected to the second input of the enable operation of the threshold unit 11, the counting pulses to which are received from the counter 7. The third input of the AND-NOT 4 element through the EXCLUSIVE OR 12 element and the galvanic isolation unit 13 is connected to the control unit 14, and the output of the EXCLUSIVE element OR 12 is connected to the input of the second AND-NOT 15. element whose output is connected to the enable input of the counter 7 and the threshold unit 11. The start button of the indicator ON unit 9 is connected to one of the inputs of the EXCLUSIVE OR 8 element, the output of the threshold block OKA 11 is connected to the signal unit 16.

The device operates as follows. zom.

When the escalator is operating, pulses from the path sensor 1 through the galvanic isolation unit 2 are supplied to one of the inputs of the EXCLUSIVE OR 3. The output of which rectangular pulses is sent to the counter 6 of the escalator mileage, delay unit 5 and the first input of the AND-NOT 4 element, while the first the pulse from the sensor 1 puts the delay unit 5 in the active state, prohibiting the operation of the first unit 11, which determines the mismatch of the braking distance.

At the first moment the braking of the escalator begins, the signal from the control unit 1 through the galvanic isolation unit 13 is fed to the EXCLUSIVE OR 12 element, the output of which is a logical 1 signal that allows the operation of the AND-NOT 4 element, as well as to the AND-NOT 15 element, the output of which a signal appears that allows the counter 7 of the braking distance and the threshold unit 11. In this case, the output of the AND-NOT 4 element displays pulses from the sensor 1, which arrive at the counter 7 and the EXCLUSIVE OR 8 element, the first pulse from the output of which starts block 9 is on I have indicators, at the output of block 9 of turning on the indicators, a logical 1 signal is generated, allowing the indicators to work in block 10. From the output of the AND-NOT 4 element, the pulses go to the counter input of counter 7 until the escalator stops completely, after which the delay unit 5 goes to zero and allows the operation of the threshold block 11. moreover, the pulses to the counting input of block 11 come from one of the bits of the counter 7, the output of the threshold block 11 is connected to the input of the signal block 16.

After turning off the braking distance indicators in block 10 to restore the indications of indicators, restart the block 9 for turning on the indicators using button 17.

When the escalator is put into operation, a signal appears on the output of the AND-NOT 15 element, resetting the information of the counter 7 and the threshold block 11, and a signal appears on the output of the EXCLUSIVE OR 12 element that prohibits the operation of the AND-NOT 4 element.

Sensor 1 is located on the escalator in the area of the traction chain of the escalator.

During the operation of the escalator, the track sensor 1 generates pulses with a quantization step equal to 10 mm of the run of the escalator, which provides an increase in the accuracy of measuring the braking distance, allows you to use a decimal counter to calculate the braking distance directly from the input pulses. coming from the sensor, and this reduces the hardware cost of the device and increases the reliability of its operation.

Claims (1)

Claim A device for measuring the braking distance of an escalator, containing a pulse track sensor, a pulse counter, a block of indicators. a braking distance pulse counter control unit, characterized in that. what. in order to increase accuracy and reliability, it is equipped with elements EXCLUSIVE OR, AND NOT. a delay unit, a threshold unit with a signaling device connected to the output and an indicator switching unit, an output connected to the control input of the indicator unit, and an input connected to the output of one of the elements EXCLUSIVE OR. the input of which is connected to the output of one of the AND-NOT elements connected to the information input of the counter, one of the inputs of which is connected to the output of the second EXCLUSIVE OR element connected to the output of the second element AND, connected to the output of the pulse counter control unit, and the output of the second element AND is NOT connected to the control inputs of the pulse counter and the threshold block connected by the information input to the output of the pulse counter, and the control to the output of the delay block. connected to the second input of the first 5 of an AND-NOT element, the third input of which is connected to the output of the third EXCLUSIVE OR element connected to the input of the delay unit, the input of which is connected to a pulse track sensor.