SU758078A1 - Device for service-life testing of relays - Google Patents

Description

The invention relates to the field of instrumentation and can be used for endurance tests of the relay. five

There are known devices for life tests of relays containing a pulse generator, an input pulse counter, a time pulse machine, a clock polling unit, an output pulse counter | θ, decoupling diodes, and indicator elements [ΐ].

The specified device is complex and insufficient reliability. 15

The closest in technical essence to the present invention is a device for life test relays containing the first and second sensors, the first and second delay elements, 29 serially connected frequency adjuster, frequency divider, key, pulse driver and first counter, the output of which and the second pulse driver output are connected to the second input of the key, the second output of which is connected to the trigger input, the outputs of which are respectively connected to the inputs of the first and second windings of the relay, the second

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the input of the frequency divider is connected to the output of the pulse generator, the outputs of the first, second, third and fourth elements of the comparison are connected to the first inputs of the second, third, fourth and fifth counters, respectively, the second inputs of the second and third counters and the first and second elements of the comparison are connected to the second input of the first the counter, the second inputs of the fourth and fifth counters, and the second inputs of the third and fourth elements of the comparison are connected to the third input of the first counter [2].

The disadvantage of the known device is the low reliability of the control, which it carries out.

The purpose of the invention is to increase the reliability of control.

This goal is achieved by the fact that the outputs of the first and second sensors are connected to the inputs of the first and second, third and fourth elements of the comparison, respectively, the first and second outputs of the trigger are connected through the first and second delay elements respectively to the second and third inputs of the first

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758078

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counter. The block diagram of the device shown in the drawing. The diagram shows: the first and second sensors 1 and 2, disconnecting 3 and closing 4 contacts of the tested relay, first 5, second 6, third 7 and fourth 8 elements of comparison, first 9, second 10, third 11 and fourth 12 counters, first 13 , the second 14 windings of the relay, the first 15 and the second 16. delay elements, trigger · 17, pulse generator 18, frequency master 19, frequency divider 20, key 21, driver 22, fifth meter 23.

The device works as follows. When the “start” button is pressed, the shaper 22 is triggered, resetting to the initial state the decimal counters 9-12 and the software one. the capacity of the binary counter is 23 (the number of operations is set using a preliminary set of pins on the punched card). After a delay generated by the shaper 22, a starting pulse is issued to the key 21 and the output pulses of the required frequency from the generator 18 appear at its output through the frequency divider 20. The division factor is selected depending on the type of relay being tested and switched by the frequency adjuster 19. Pulses from the key 21 control the operation of the trigger 17, the switching winding 13, 14 of the test relay. The input pulses of the windings through the delay elements 15,16 commute the second inputs of the comparison elements 5-8, counters 9-12 and the input of the counter 23.

If the relay works without failures, then at the output of sensors 1 and 2 when the contacts are opened and closed (and vice versa), impulses appear, triggering comparison elements at their inputs, while other inputs do not have permission from the outputs of the delay elements. In the other half period, at one input of the comparison element, the resolving potential from the sensors disappears, and at the other input, the resolving potential appears with a delay) which is chosen longer than the relay. In such a situation, the output potential of the comparison elements, which locks the failure counters, does not change.

In the event of failure of a relay contact, the corresponding comparison element does not close at one input, and the delayed impulse that arrives at the second clock to another input from the trigger arm 17 causes the comparison element to operate and, therefore, the counter 9,10, 11 or 12 ..

The pulses from the delay elements are recorded in the counter 23. When the counter 23 is filled in accordance with the previously set program capacity, a control signal will appear at its output, which prohibits

key 21. The device stops and counters 9-12 show the number of errors.

The device allows you to test the service life of any electromagnetic or electronic circuits (elements) that have potential outputs.

In this case, instead of windings 13,

14 relays can use the inputs of logically mutually opposite electromagnetic or electronic circuits (elements) having potential outputs, and instead of sensors of closing and opening contacts 1,2 sensors of the output reactions of the tested circuit (element) to the influence of the corresponding input signal. In the absence of logically mutually opposite inputs of the tested circuit, the output resistance of one of the arms of trigger 17 should include an equivalent resistance as in the case of control of a single-winding relay.

If there is no need to classify the failures, one counter of the number of failures can be applied, and its input must be switched by the total signal with the output of all comparison circuits.

The present invention simplifies the electrical circuit of the test installation in comparison with the known solutions by reducing the connections and the number of elements in it, increases the reliability and increases the reliability of the control results.

Claims (1)

Claim A device for life tests of a relay, containing the first and second sensors, the first and second delay elements connected in series to the frequency adjuster, frequency divider, key, pulse driver and the first counter, the output of which and the second pulse driver output are connected to the second key input, the second output of which connected to the trigger input, the inputs of which are respectively connected to the inputs of the first and second relay windings, the second input of the frequency divider is connected to the output of the pulse generator, the outputs of the first, second , the third and fourth comparison elements are connected to the first inputs of the second, third, fourth and fifth counters, respectively, the second inputs of the second and third counters and the first and second comparison elements are connected to the second input of the first counter, the second inputs of the fourth and fifth counters and the second inputs of the third and fourth comparison item five 758078 6 connected to the third input of the first counter, characterized in that, in order to increase the reliability of control, the outputs of the first and second sensors are connected to the inputs of the first and second, third and fourth fifth comparison elements, respectively, the first and second outputs of the trigger are connected through the first and the second delay elements respectively to the second and third inputs of the first counter.