SU1117729A1 - Device for checking contact pressure of normally closed contact of electromagnetic relay - Google Patents

Abstract

CONTROL PRESSURE CONTROL DEVICE RADIO) TEST; CONTACT-ELECTROMAGNETIC RELAY power source containing a power source of a relay winding, to the output of which through a switching unit leads for connecting the winding of the controlled relay connected in series with the additional resistor, power source of the relay contacts are connected to the output of which is connected Contact load switch is connected to a reed for connecting a switching contact of a monitored relay, terminals for closing and opening contacts of which is connected Yucheny to the common bus device, the program and control unit, the first output of which is connected to the control unit input to the switching unit, in order to increase the reliability of the control, the control unit of the time of the joint running of the switching and closing contacts when activated is introduced into it, the control unit of the time of flight of the switching contact when releasing the self-induction winding without shunting the EMF, the control unit of the time of flight of the switching contact during the release process with the shunting of the EMF of self-induction the winding, the analyzer of the dynamics of the movement of the core in the shape of the winding when released, two elements AND and element OR, the second output of the program and control block is connected to the first inputs of the elements AND, the third output of the program and control block is connected to the control input the unit controlling the time of the joint stroke of the switching and closing contacts when triggered, the fourth output of the program and control block is connected to the control input of the unit controlling the transfer time of the switching contact at from (L start without shunting the self-induction EMF of the winding, the fifth output of the program and control unit is connected to the controlled input of the control unit of the time of flight of the switching contact in the release process with the shunt. the EMF of self-induction winding, the sixth output of the program and control unit is connected to the control input; the unit of the analyzer of the dynamics of the movement of the core according to the form of the winding current when released, the first signal input of the unit controlling the time of the combined stroke of the switching and closing contacts when triggered and: the signal input of the unit of the analyzer of the dynamics of the movement of the cor, according to the form of the current of the winding when released, parallel to the incremental resistor, the second signal input of the time control unit of the combined stroke of the switching and closing contacts when triggered and the signal inputs of the time control unit pe

Description

summer of a switching contact when releasing a winding self-induction EMF and shunt control unit of a switching contact during release with shunting of a winding self-induction EMF are connected to the output for connecting a switching contact of the tested relay, the first outputs of the control unit of the time of the joint running of the switching and closing contacts when triggered, the control unit of the transit time of the switching contact when released without shunting the EMF of the self-induction winding and the control unit in The trip time of the switching contact during the release process with shunting of the EMF of the winding self-induction is connected to the second, third and fourth inputs of the first element I, the second outputs of the control unit of the combined stroke time of the switching and closing contacts when triggered, the control unit of the flight time of the switching contact when releasing without shunting the EMF of self-induction the winding and the flight time control unit of the switching contact in the process of release with the shunting of the EMF of the self-induction winding are connected to the second, third and fourth inputs of the second element I, the output of the analyzer of the dynamics of the movement of the core in the form of the winding current when released is connected to the fifth input of the first element AND, the outputs of the elements AND are connected to the inputs of the element OR, the output of which is the output of the device.

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The invention relates to electrical engineering and instrumentation technology and can be used for; non-destructive (without opening) control of the contact pressing of the break contacts of electromagnetic relays in production conditions.

Devices for manual control of contact pressure of electromagnetic relays are known, which are force gauges, dynamometers, gramometers, and the like. With the help of these devices, the contact pressing of the opening contacts is tested with de-energized windings by pulling the moving contact away from the contact. In this case, the magnitude of the contact pressure is determined at the time of the opening of the current indicator circuit jj by opening the contact.

However, due to the fact that the direction of the force during the deflection of the contact and the point of application of the force during the deflection are manually set by the controller, considerable subjectivity, low accuracy and performance are inherent in controlling the contact pressing of the opening contact. In addition, the application for controlling the contact pressure of these known devices leads to contamination and microstrain of the contact surfaces. At the same time, it is impossible to control the contact pressure on the covered relays without breaking them (open).

Closest to the invention by technical essence is a device for measuring a contact pressure of a closing contact, containing functionally interconnected power supply unit, a current control unit in a relay coil, a unit for removing a pulse from a relay coil, an amplifier, a driver and a time meter. The device estimates the contact pressure of the closing contact indirectly by the pulse duration generated by the forwarder from the moment the relay cortex is triggered when released (at that moment the winding of the relay being tested, powered with a smoothly reduced current, is disconnected from the power supply) until the contact opens, t. e. evaluates the time of the combined stroke of the switching and closing contacts when releasing 2j.

However, the known device has a low accuracy of measurement results due to the fact that run 3 of the joint switching and closing contact stroke time when releasing, besides the magnitude of the contact pressure, is influenced by the pressure of the return spring, the size of the air gap between the core and the pole of the actuated states, stiffness of the contact springs, friction in the axles of the core during movement and a number of other factors. All the listed factors determine the speed and time of the core movement when released and differ significantly (several times) from different relays of the same type. As a result, when using a known device that evaluates the contact pressure only from one indirect characteristic of the relay, the number of false rejection cases the relay and the number of cases of recognizing suitable relays with an insufficient amount of contact pressure, reaches 30% of the total number of tested relays. The aim of the invention is to increase the reliability of monitoring the contact pressure of the opening contact of an electromagnetic relay. The goal is achieved by the fact that the device for controlling the contact pressure of the opening contact of the electromagnetic relay, contains the power source of the relay coil, and through the switching unit the terminals for connecting the coil of the monitored relay connected in series with the additional resistor, the power supply of the relay contacts to the output are connected which through a contact resistor is connected to the output for connecting the switching contact of the monitored relay, the terminals for connecting the closing and The plug-in contacts of which are connected to the common bus of the device, the program and control unit, the first output of which is connected to the control input of the switching unit, the control unit for the time of the joint running of the switching and closing contacts when triggered, the control unit for the time of the switching contact for releasing without EMF bypassing winding self-induction, coitrol unit time of flight of the switching contact in the process of release with shunting of the EMF of self-induction of washing 29 ki, dN analyzer block; tim armature winding by current shape when released ,. two elements AND and element OR, the second output of the program and control block is connected to the first inputs of the elements AND, the third output of the program block and is stopped, is connected to the control input of the control unit of the time of the joint running of the switching and closing contacts when triggered, the fourth the output of the program and control unit is connected to the control input of the time control unit. The transfer of the switching contact when released without shunting the EMF of the winding self-induction, the fifth output of the program and control unit is connected to to the control input of the control unit of the flight time of the switching contact during the release process with shunting of the self-induction EMF of the winding i sixth OUTPUT: the program and control unit is connected to the control input of the dynamics analyzer of the movement of the winding current when released, the first signal input of the control unit the time of the joint stroke of the switching and closing contacts when triggered and the signal input of the analyzer block of the movement of the core according to the form of the winding current when released are connected in parallel about the additional resistor, the second signal input of the control unit of the combined stroke of the switching and closing contacts when triggered, and the signal inputs of the trip time control unit of the switching contact when released. without shunting the EMF of the winding and the switching time of the switching contact in the process of releasing with the shunting of the EMF of self-induction of the winding connected to the output to connect the switching contact of the relay to be tested, the first inputs of the time-sharing control unit and switching and NO contacts at operation, the control unit switches the flight time -. when releasing without shunting the EMF of the self-induction of the winding and the flight time control unit of the switching contact in the process of releasing with the shunting of the EMF of the self-induction winding are connected to the second, third and fourth inputs of the first element And, the second outputs of the control unit of the time of the joint stroke of the switching and closing contacts when triggered, the control unit of the time of the flight of the switching contact when releasing without shunting the EMF of the self-induction winding and the control unit of the time of the flight switch u its contact in the process of release with shunting of the EMF of the self-induction winding is connected to the second, third and fourth inputs of the second element I, the output of the analyzer unit of the movement of the core according to the form of the winding current when released is connected to the fifth input of the first element I, the outputs of the elements connected to the inputs an OR element whose output is a device output. Rejection of a fault by insufficient contact pressure of the opening contact by fixing the excess of the normalized values of each of the three parameters: the time of the joint stroke of the switching contact and closure. repetitive contact when triggered, the trip time of the switching contact when released without shunting the EMF of the winding self-induction and the trip time of the switching contact during the release with shunting of the EMF of the winding self-induction ensures high accuracy of the framing, taking into account all the characteristics of the relay with correlation with controlled value. Comparison of each of these parameters with one of two normalized values, which is selected in the device depending on the dynamics of the motion of the core, also contributes to the high reliability of the scrutiny. FIG. 1 shows a functional diagram of the proposed device, FIG. 2 - timing diagrams of the change in current in the winding and in the voltage on the switching contact of the relay during the operation; in fig. 3 - the same, in the process of releasing during the shunting of the EMF of the self-induction of the winding; in fig. 4 - the same, when releasing without shunting the EMF of the self-induction of the winding. The device for controlling the contact pressing of the opening contact of the electromagnet relay contains a winding power supply 1, the output of which through the switching unit 2 is connected winding 3 of the relay being tested. 729 is connected in series with the additional resistor 4. The switching contact 5 of the tested relay is connected via a contact load resistor 6 to the output of the contact supply source 7, and the disconnecting contact 8 and the closing contact 9 of the tested relay are connected to the common bus of the device. The control input of the switching unit 2 is connected to the first output of the program and control unit 10, whose second output is connected to the first outputs of the elements 11 and 12, the third output to the control input of the unit 13 for controlling the time of the switching and closing contacts when triggered, the fourth output - to the control input of the trip time control unit 14 of the switching contact when releasing the winding self-induction without shunting the EMF; the fifth output - to the control input of the flight time control unit 15 in releasing the contact with the self-induction electromotive force shunting winding sixth output - to the control input of the analyzer 16 according to the dynamics of motion of the armature winding current shape when released. The first signal input of the block 13. and the signal input of the block 16 are connected in parallel with the extension resistor 4, and the second signal input of the block 13 and the signal inputs of the blocks 14 and 15 are connected to the switching contact 3 of the relay to be tested. The first outputs of blocks 13-15 are connected to the second, third and fourth inputs of the first element And It, and their second outputs to the second, third and fourth inputs of the second element And 12. The output of block 16 is connected to the fifth input of the first element And 11, and the outputs of the elements AND AND 12 are the inputs of the element OR 17, the code of which is the output of the device. The device works as follows. The contact contact of the opening contact is controlled during the switching process of the relay to be tested by an indirect method using three parameters, each of which has a correlation with the test contact value established by processing the experimental data: the time of the joint switching stroke. and closing contacts when triggered, by the time of flight of the switching contact when released without shunting the EMF of the winding self-induction and by the time of flight of the switching contact in the process of releasing with the shunting of the EMF of winding self-induction. A marriage is fixed by an insufficient amount of contact pressure if the relay being tested each of these parameters has more than one of two standards set for it, and smaller numerical values of standards for each of the parameters are set for relays that have a winding release on the falling curve of the current when shunting the EMF of self-induction of the winding, a section with a temporary increase in the current forming a characteristic surge (figure, fig. 3). For large numerical values of the norms are set for relays that have a winding current curve and there is no specified surge and release current carrying the character of a monotonously decreasing function having a section of decreasing the rate of current decline in the form of a step (logj diagram, Fig. 3S). The indicated surge or step on the decreasing current curve when released occurs as a result of EMF induction in the winding circuit during the movement of the core, they reflect the dynamics of the movement of the core. In particular, the lack of a current surge is characteristic of the slow motion of the core and causes the introduction of elevated rates, a) s the braking forces. The control of the contact pressing of the opening contact is carried out with a certain number of switching on and off of the tested relay, for example, ten, which are given by block 10 of the program and control. In this case, the first five switch-offs of the tested relay are made in shunting the emf of self-induction of the winding through resistor 4, and the subsequent five shutdowns - without shunting the specified emf of self-induction. In the process of control, at each switch-on of the tested relay and at each switch-off with the shunting of the EMF of the self-induction of the winding, the resistor 4 is released, which is proportional to the current in the winding. Before the start of the control cycle of the relay, block 10 sets blocks 13–16 to the initial state, at which on each of the outputs of blocks 13, 14 сигнал 15 a signal O occurs, and at the output of block 16 a signal 1. At the start of the test cycle, the relay 10, at the second output, the signal O, which is fed to the first inputs of the elements 11 and 12 for the entire duration of the relay test. Thus, before the end of the test cycle, the relay at the output of the elements 11 and 12 has a signal O, which also takes place at the output of the element OR 17, the output of which is the output of the device. The relay test cycle starts from the moment the winding 3 is connected to the source 1. After that, the winding 3 is disconnected to it. The switching unit 2, by the command of the unit 10 for the first five trips of the winding 3 from the source 1, provides shunting of the self-induction EMF through the resistor 4. During each of the ten responses of the tested relay, the unit 13, by the commands of the unit 10, compares the time of the joint switching. closing contact (section t in the diagram, Fig. 2) with two standards, and, if the specified time is more than the normal rate (i.e., the norm is set for relays having a surge in the current curve), block 13 causes signal 1 on the first drive to go and if specified in The higher the second norm (i.e. the norm established for a relay without a surge in current curve), the block 13 vdaet signals, one on the first and second outputs. In this case, vivshies. during the relay test, signals 1 on one or both of the outputs of block 13 are saved until the start of a new relay test cycle. . During each of the first five trips of the winding 3 from the source 1, the unit 15 compares the time of flight of the switching contact (section tf, gp in the diagrams, FIG. 3) by the commands of the unit 10 with two standards. If the trip time of the switching contact in the process of releasing with the shunting of the self-induction EMF of the winding is more than the first norm, block 15 outputs signal 1 at the first output, and if the specified time is longer than the second norm, block 15 outputs signal f at the second output. At the same time, the signals 1, which have appeared during the test, are kept at the outputs of unit 15 until the start of a new relay test cycle. 9 In addition, during the first five trips of the winding 3 from the source 1, the unit 16 is controlled by the commands of the unit 10 on the descending winding current curve when the current surge is released. In this case, if a current surge occurs on the falling curve, block 1 retains its initial state (signal 1) at the output, and if there is no current surge, signal O appears at the output of block 16, which remains until a new cycle begins. relay checks. During each of the last five trips of winding 3 from source 1, block 14 is compared by the commands of block 10 to the switching time of the switching contact.

occurring when released without a shun-20, depending on the dynamics of movement

In the process of braids (plot on diagram C,; ,, 4), a self-induction of the contact pressing

also with two norms. At the same time, her objective objectivity of specific flight time was greater than the first normality of each relay instance, which

We, block 14, signals 1 at per-25, cause a significant (5–6 times) direct output, and if the indicated time is more than the second norm, block 14 causes signal 1 at the first and second outputs. The signals 1 that have been detected during the test process at the outputs of block 14 are saved until the start of a new relay test cycle. Thus, if during the test cycle of a relay, signals 1 appear at the first outputs of each of blocks 13, 14 and 15, and signal 1 also occurs at the output of block 16, then at the end of the relay test cycle, when block 10 activates signal 1 The first inputs of the elements 11 and 12, at the output of the element 11, a signal 1 appears, which causes the appearance of a similar signal at the output of the element OR 17, which leads to a fault recorder (not shown) triggered by the contact pressure of the normally closed contact. If during the test cycle of a relay, signals 1 appear at the second outputs of each of blocks 13, 14 and 1, then at the end of the test cycle, relay 29 appears signal 1 at the output of element I 12, which also causes the fault recorder to operate according to the contact value press the break contact. Control in the proposed contact device for opening contact by checking three indirect parameters (joint time of switching and closing contacts when triggered, flight time of the switching contact when releasing self-induction winding without shunting the EMF and switching time of the contact contact when releasing the winding self-induction EMF), and also the comparison of each of the specified parameters with one of the two norms is the decrease in the share of mistakenly rejected and erroneous nezabrakovannyh a relay compared with the known device. In particular, the control of the contact pressing of the break contact at the microminiature sealed relays with the help of the proposed device allows the screening with a reliability that is not worse than the contact pressure that exists with the koHTpone after opening the relay. Thus, the control of the contact pressing of the opening contact according to the scheme of the proposed device allows, in combination with the devices for non-destructive testing of other parameters of the assembly and adjustment (clearance and contact failure), to create automatic devices for controlling the control parameters without opening sealed relays in production conditions for acceptance tests x This will avoid the destruction of a significant number of relays (on the order of 2% of the total output).

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Claims (1)

DEVICE FOR CONTROLLING CONTACT PRESSURE OF NON-CIRCUITING ELECTROMAGNETIC RELAY CONTACT, containing a relay coil power supply, to the output of which through the switching unit are connected the terminals for connecting the controlled relay winding, connected in series with an additional resistor, a relay contact power source, to the output of which a terminal is connected to the output through the contact load resistor for connecting the switching contact of a controlled relay, the output for connecting the NO and NC contacts of which are connected to the device’s common bus, the program and control unit, the input of the time control unit, the combined output of which is connected to the control input of the switching unit, which is characterized by the fact that, in order to increase the reliability of control, a control unit for the time of the joint stroke of the switching and closing of contacts during operation, the control unit of the flight time of the switching contact when releasing the EMF of the winding self-induction without shunting, the unit of monitoring the time of flight of the switching contact in the process of releasing from the shuntiro EMF winding self-induction, a block analyzer of the dynamics of the movement of the armature in the form of the winding current when releasing, two AND elements and an OR element, the second output of the program and control unit connected to the first inputs of the AND elements, the third output of the program and control unit connected to the control input of the unit monitoring the time of the joint stroke of the switching and closing contacts during operation, the fourth output of the program and control unit is connected to the control input of the control unit of the flight time of the switching contact when scanning without shunting the EMF of the winding self-induction, the fifth output of the program and control unit is connected to the controlled input of the control unit 'flight time of the switching contact during the release with the EMF of the winding self-induction being shunted, the sixth output of the program and control unit is connected to the control input of the analyzer block of the dynamics of the armature the shape of the winding current when released, the first signal e S3 ω when the switching and closing contacts move upon actuation, the signal input of the analyzer block of the dynamics of armature movement in the form of the winding current when released is connected in parallel with the additional torus, the second signal input for controlling the time of the joint switching and closing toggle during operation and the signal inputs of the time control unit summers of the switching contact when releasing the EMF of the winding self-induction and the time control unit of the flight of the switching contact during the releasing with shunting the EMF of the winding self-induction are connected to the terminal for connecting the switching contact of the relay under test, the first outputs of the joint time control unit of the switching and closing contacts during operation, the block control of the flight time of the switching contact when releasing the self-induction winding and time control unit without shunting EMF and trip the switching contact during release from the bypass electromotive force of self-induction coil connected to the second, third and fourth inputs of the first second AND gate, the second output unit ¹ controls the time sharing stroke switching and closing contacts when triggered, control unit trip time of the switching contact when released without shunting EMF of the self-induction of the winding and the control unit of the flight time of the switching contact during the release with shunting EMF of the self-induction of the winding is connected to the second mu, the third and fourth inputs of the second element And, the output of the analyzer block of the dynamics of the movement of the armature in the form of the winding current when released, is connected to the fifth input of the first element And, the outputs of the elements And are connected to the inputs of the OR element, the output of which is the output of the device.