SU940088A1 - Device for checking switching article electric contact transitional resistance - Google Patents

Description

(5) A DEVICE FOR THE CONTROL OF TRANSITIONAL RESISTANCE OF ELECTRICAL CONTACTS OF SWITCHING PRODUCTS The invention relates to measuring technique and can be used to control the contact resistance of switching products. A device for monitoring the transition resistance of switching products is known, which contains a power supply clamping unit and a meter fij. A disadvantage of the known device is the low speed due to non-automatic control of products. Closest to the proposed device for monitoring the electrical parameters of electronic products contains a connection unit, a power supply unit, an analysis unit, a threshold unit, a display unit and a trigger unit 2. A disadvantage of the known device is low speed, due to the fact that the parametric measurements are made regardless of the TOGO, there is contacting in the connection block or not, and also whether the monitored contacts are suitable for operation or unsuitable, which leads to unnecessary time spent on monitoring unsuitable for the functioning of products. Another disadvantage of the known device is the low reliability of the measurement controllers, due to the fact that the measurements are performed once. The purpose of the invention is to increase the reliability of the control and speed of the device. The goal is achieved by the fact that the device for monitoring the transient resistance of the electrical contacts of switching products, containing the power supply, the first analysis unit connected to the input of the recording unit, the first input to the output of the threshold unit connected to the first and second inputs, respectively, through the first and second contacts of the connection block with the first and second pins of the monitored product connected by the third and fourth pins through the third and fourth pins of the connection block with the third the input of the threshold unit, the startup unit connected by the first input to the device input, eight transistors are introduced: delay element, pulse distributor, second analysis unit, contact recorder, counter, three flip-flops connected with the first and third inputs with the corresponding first outputs of the pulse distributor connected with the second output the second input of the first analysis unit, the third output through the counter — with the second input of the recording unit, the input — with the first output of the start-up unit connected by the second output with the collector of the first transistor, the input through the source element — with the first output of the second analysis unit connected by a second output to the third input of the registration unit, the input to the output of the contact recorder, the third output to the input of the first trigger connected by the first and second outputs respectively with the bases of the second and third transistors, the collectors of which are connected to the output of the power supply unit, the emitters, respectively, with the collectors of the fourth and fifth transistors connected by bases to the first output of the second trigger , emitters, respectively, through the fifth and sixth contacts of the connecting unit — with the first and second outputs of the monitored product and directly with the collectors of the sixth and seventh transistors connected by bases to the second output of the second triggera, emitters — to the first and second inputs of the contact recorder, respectively the first transistor is connected to the first output of the third trigger, the emitter, respectively, through the seventh and eighth terminals of the connection block - with the third and fourth pins of the monitored product and directly to the collector of the eighth transistor, connected by a base to the BTopjJM output of the third trigger, emitter - to the common bus of the device. The drawing shows a block diagram of the proposed device. The device contains the fourth 1, sixth 2, first 3 eighth h, fifth 5, seventh 6 transistors, pulse distributor 7, second 8 and third 9 triggers, contact recorder 10, second analysis unit 11, second 12 and third 13 transistors, first trigger 14, delay element 15, start-up block 16, controlled article 17, connection block 18 with fifth 19, seventh 20, sixth 21, eighth 22, first 23, third 2kf second 25 and fourth 26 pins, threshold block 27, first block 28 analysis, block 29 registration and counter 30. The device operates as follows. In the first subcycle, the first channel is monitored (in the drawing, normally closed contacts of the product 17). In the second subcycle, when switching the product 17, the second channel is controlled (in the diagram, normally open contacts of the product 17). The first and second subcycles are repeated up to three times. In the initial state, transistors 2 and 3 are opened by triggers 8 and 9. On the Start signal, the starting block 16 outputs to the transistor 3 pulses, which, passing through the transistor 3, contacts 20, product 17, contact 19 and transistor 2, arrive at the registration block 10 contact, which analyzes and stores information about the state of the test contact of the test article 17. If pulses pass through the test article 17, then unit 10 outputs the appropriate control signal to unit 11, which outputs contact information to unit 29 and starts repents element 15 delays the start of measurement to the time required for completion of the article contacts bounce 17. In the case of the presence of element 15 contacting the delayed signal is supplied to block 11 block 16 start, which starts the valve 7, which is a, for example, a shift register. Simultaneously, block 11, via trigger Ik, turns on transistors 12 or 13, depending on which of the transistors (2 or 6) passed the pulses from block 16 to block 10. Distributor 7 in one subcycle gives out five control pulses. On the first pulse, the trigger 9 closes the transistor 3, stopping the passage of pulses from the block 16 and opens the transistor 4, preparing the circuit for the passage of the measuring current.

On the second pulse, the trigger 8 closes the transistor 2 and opens the transistor 1, while the power supply unit 31 sets the current through the open transistors 12, 1, the contacts 19 of the connection unit 18, the closed contacts of the product 17, the contact 20 of the connection unit 18, the open transistor 4 tire. The voltage from the closed contacts of the monitored product 17, proportional to the transient resistance, through the contacts 23 and 2 of the connecting unit 18 goes to the threshold unit 27 (high level - if the contact resistance of the product 17 is valid and low level - if it is unusable). .

The third pulse gates analysis block 28, Gating is performed at the time of the middle of the current pulse, which allows for high accuracy of control. Upon arrival from threshold block 27 to block 28 of a high level, block 29 comes along the gate with a Marriage signal, which is immediately displayed by block 29, while at a low level, C, Goden drove,

The Goden signal is memorized in block 29 and is displayed for indication only after the end of the complete control cycle of the product 17, which includes six sub-cycles.

On the fourth pulse, the distributor 7 through the trigger 8 restores the initial state of the transistors 1, 2 and stops the passage of the measuring current through the contacts of the monitored product 17.

By the fifth pulse, the trigger 9 restores the initial state of the transistors 3 and, prepares the control of the transient resistance and the second pair of contacts of the product 17.

A counter of 30 subcycles counts the first subcycle.

After the first subcycle is completed, the device is in the initial state and is ready for operation in the second subcycle. The start of the start of the device in the second subcycle is determined by composing pulses at the output of block 10, coming from block 16 through the open transistor 13, pin 22, the controlled contacts of the product 17, pin 21 and the open transistor 6.

These pulses appear at the inputs of block 10 after switching on the controlled article 17 manually or automatically.

If there is a contact in the connection block 18 and the controlled product 17, the block 11 receives a trigger 1, which closes the transistor 12 and opens the transistor 13, preparing the task from the material current through the second pair of controlled contacts of the product 17- After that, the device works as in the first subcycle .

At the end of the second subcycle, the device is prepared to control the first pair of contacts of the product 17 in the third subcycle.

Block 9 indicates and registers the validity or uselessness of the product 17 after three times checking each pair of its contacts, i.e., after implementing six subcycles when the enabling pulse from the counter of 30 subcycles (after the sixth sub cycle) arrives at block 29.

 The operator receives information about the result of checking the monitored product in the form of the inclusion of the Goden Brac scoreboard. There are no contacts in block 29. Thus, by introducing a preliminary functional control of contact in block 18, as well as contacts of product 17, time cameras for parametric control of obviously useless products are excluded, which increases device speed. The introduction of multiple checks of the same parameter increases the reliability of control results

Claims (2)

Invention Formula A device for monitoring the transient resistance of electrical contacts of switching products, containing a test unit, a first analysis unit connected by an output to an input of a registration unit, a first input to an output of a threshold unit connected by the first and second inputs, respectively, of the first and second contacts of the connection unit to the first and second the second pins of the monitored product, connected by the third and fourth pins through the third and fourth pins of the connection block with the third input of the threshold block, the start block The first input is connected to the input of the device, characterized in that, in order to increase the reliability of the control and speed of the device, eight transistors, a delay element, a pulse distributor, a second analysis unit, a contact recorder, a count, three triggers connected first and the second inputs with the corresponding first outputs of the pulse distributor connected by the second output to the second input of the first analysis unit, the third output through the counter to the second input of the registration unit, the input m - with the first output of the startup unit connected by the second output to the collector of the first transistor; the trigger connected by the first and second outputs respectively to the bases of the second and third transistors, the collectors of which are connected to the output of the power supply unit, the emitters respectively to the collectors of the fourth and n 9t 8 tog transistors connected to the base of the first output of the second trigger, emitters, respectively, through the fifth and sixth contacts of the connection block with the first and second outputs of the controlled product and directly to the collectors of the sixth and seventh transistors connected to the bases of the second output of the second trigger, emitters with the first and second recorders contact, respectively, the base of the first transistor is connected to the first output of the third trigger, the emitter, respectively, through the seventh and eighth contacts of the power unit Connections to the third and fourth terminals of the monitored product and directly to the collector of the eighth transistor connected to the base of the second output of the third trigger, emitter - to the common bus device. Sources of information taken into account in the examination 1. USSR author's certificate number ZEO + TB, cl. G 01 R ZT / O, 1973. 2.Enshtein S., L. Digital devices and systems for measuring the parameters of capacitors. M., Soviet Radio, 1978, p. 58 (prototype).