A test method for the weldability of signal relay contact materials

Abstract

The present invention relates to a test method for the fusion welding property of a signal relay contact material, which is characterized by at least comprising: a silicon rectifier (2), a first filter capacitor (3), and a discharge resistor (4), wherein the discharge resistor (4) forms a discharge circuit, a control circuit (7) is provided at both ends of the signal relay (5), a switch (11) of the signal relay (5) is connected between the first filter capacitor (3) and the discharge resistor (4), the switch (11) is connected to a test contact (1), the signal relay (5) and the control circuit (7) are electrically connected, the discharge resistor (4) is electrically connected to the control circuit (7), the control circuit (7) controls the signal relay (5) to be turned on and off, and the control circuit (7) records the state information of the test contact (1), the power supply is connected to the input end of the silicon rectifier (2), and the first filter capacitor (3) is connected in parallel to the output end of the silicon rectifier (2); the test method for the fusion welding property of the signal relay contact material can provide a verification method for the selection of the type and structure of the relay contact material when designing the signal relay contact, and is highly efficient.

Description

Technical Field

[0001] The invention relates to a test method for the anti-welding performance of a contact, in particular to a test method for the fusion welding property of a signal relay contact material. Background Art

[0002] Although the contacts of signal relays used in my country have good resistance to fusion welding, they are still fusion-weldable contact materials. In order to make my country's signal relays meet international standards and make our relay contacts free of the risk of fusion welding, it is necessary to test the fusion welding resistance of silver-silver graphite contacts. Therefore, the use of silicon rectifiers and resistors and capacitors for fusion welding resistance testing is a highly intuitive, easy-to-operate, and relatively low-cost contact measurement method, which has been applied in fusion welding detection and has strong practical value.

[0003] Usually a filter capacitor is used. In the test circuit, when the contact to be tested is not connected, the capacitor is charged and a certain charging voltage is reached at both ends of the capacitor. At this time, the current I in the circuit is 0. The relay switch is closed manually, the relay is sucked up, the contact to be tested is connected, and the capacitor is discharged through the contact to be tested. At this time, a pulse current is generated through the contact to be tested. The switch is opened, the relay falls, the contact to be tested is disconnected, and the switch is closed again. The test is repeated many times to observe whether the contact to be tested is bonded.

[0004] This test method of manually observing the weldability of the signal relay contact material has human factors, low efficiency, and no historical data is recorded. Summary of the invention

[0005] The invention provides a test method for the fusion welding property of a signal relay contact material, which can provide a verification method for the selection of the type and structure of the relay contact material when designing the signal relay contact, and has high efficiency.

[0006] The technical solution solved by the present invention is: it relates to a test method for the fusion welding property of the contact material of a signal relay, which is characterized by: at least comprising: a silicon rectifier, a first filter capacitor, and a discharge resistor, wherein the discharge resistor constitutes a discharge circuit, a control circuit is provided at both ends of the signal relay, a switch of the signal relay is connected between the first filter capacitor and the discharge resistor, the switch connection and disconnection point is the contact to be tested, the signal relay is electrically connected to the control circuit, the discharge resistor is electrically connected to the control circuit, the signal relay is controlled to be turned on and off by the control circuit, the control circuit also records the state information of the contact to be tested, a power supply is connected to the input end of the silicon rectifier, and the first filter capacitor is connected in parallel to the output end of the silicon rectifier; when the signal relay is not connected, the silicon rectifier rectifies, the first filter capacitor is charged, and when a certain input peak voltage is reached, the charging current I =0, the control circuit controls the closed signal relay, the signal relay is sucked up, the contact under test is connected, the first filter capacitor discharges through the contact under test and the discharge resistor, a pulse current is generated at both ends of the discharge resistor and passes through the contact under test and the discharge resistor, the signal relay is disconnected, the contact under test is disconnected, the test is repeated many times, and the control circuit records the number of times the signal relay operates and whether the contact under test is bonded.

[0007] The discharge resistor is connected in parallel with the negative end of the power supply with a second filter capacitor, and the second filter capacitor is connected in parallel with an inductor L coil. When the signal relay is not connected, the silicon rectifier rectifies, and the first filter capacitor is charged. When a certain input peak voltage is reached, the charging current I = 0, and the control circuit controls the closing signal relay, the signal relay is sucked up, the measured contact is connected, and the first filter capacitor is discharged through the measured contact and the discharge resistor and the second filter capacitor and the parallel inductor L. The second filter capacitor at the rear end of the measured contact begins to charge. Since the voltage on the rear end second filter capacitor cannot suddenly change, and the current on the inductor L cannot suddenly change, the rear end second filter capacitor is equivalent to a short circuit at this time, and the inductor L is equivalent to an open circuit. At this time, a pulse current is generated through the measured contact, and the control circuit disconnects the relay switch, the relay falls, the measured contact is disconnected, and the rear end second filter capacitor is discharged through the inductor L. After the relay falls and the charge of the rear end second filter capacitor is discharged, the switch is closed again, and the test is repeated many times to record the number of actions of the signal relay and whether the measured contact is bonded.

[0008] The first filter capacitor is one or more capacitors connected in parallel.

[0009] The second filter capacitor is one or more capacitors connected in parallel.

[0010] The control circuit at least includes a processor and a display. The processor has multiple A / D input ports, one of which is electrically connected to a discharge resistor for obtaining a voltage or current signal of the discharge resistor; another A / D input port is electrically connected to a measured contact for obtaining a voltage or current signal of the measured contact. The display is used to display the voltage waveform of the measured contact and / or the discharge resistor.

[0011] The working principle of the present invention is: using a filter capacitor, in a test circuit, when the contact to be tested is not connected, the silicon rectifier rectifies, the capacitor is charged, and a relatively high voltage is reached at both ends of the capacitor. At this time, the current I in the circuit is 0, the relay switch is closed, the relay is sucked up, the contact to be tested is connected, and the capacitor is discharged through the contact to be tested. At this time, a pulse current is generated to pass through the contact to be tested, the relay switch is disconnected, the relay falls, the contact to be tested is disconnected, and the relay switch is closed again. The test is repeated many times to observe whether the contact to be tested is welded.

[0012] The invention has the advantages that the anti-welding performance of the tested contacts after the test process can be tested by operating the circuit, and the operation test can be repeated to record the number of relay actions, and the operation is simple and convenient.

[0013] The present invention will be further described below in conjunction with the accompanying drawings of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a circuit schematic diagram of Embodiment 1 of the present invention;

[0015] Figure 2 is a circuit schematic diagram of Embodiment 2 of the present invention;

[0016] Figure 3 This is the schematic diagram of the signal relay.

[0017] In the figure: 1. measured contact; 2. silicon rectifier; 3. first filter capacitor; 4. discharge resistor; 5. signal relay; 6. second filter capacitor; 7. control circuit; 8. inductor L; 9. processor; 10. display; 11. switch. DETAILED DESCRIPTION Example 1

[0018] like Figure 1 and Figure 3As shown, the present invention relates to a test method for the fusion welding property of a signal relay contact material, comprising: a silicon rectifier 2, a first filter capacitor 3, and a discharge resistor 4, wherein the discharge resistor 4 forms a discharge circuit, a switch 11 of a signal relay 5 is connected between the first filter capacitor 3 and the discharge resistor 4, the switch 11 is connected to the disconnection point as a contact 1 to be tested, the signal relay 5 is electrically connected to a control circuit 7, the discharge resistor 4 is electrically connected to the control circuit 7, the control circuit 7 performs on-off control on the signal relay 5, the control circuit 7 records the state information of the contact 1 to be tested, the two ends of the discharge resistor 4 are electrically connected to a processor 9 of the control circuit 7, a power supply is connected to the input end of the silicon rectifier 2, and the first filter capacitor 3 is connected to the output end of the silicon rectifier 2 in parallel; when the signal relay 5 is not turned on, the silicon rectifier 2 rectifies, and the rectified voltage is output to charge the first filter capacitor 3, and when a certain input peak voltage is reached, the charging current I = 0, The control circuit 7 controls the closing signal relay 5, the signal relay 5 is sucked up, the contact 1 to be tested is connected, the first filter capacitor 3 is discharged through the contact 1 to be tested and the discharge resistor 4, a pulse current is generated at both ends of the discharge resistor 4 and passes through the contact 1 to be tested and the discharge resistor 4, the signal relay 5 is disconnected, the contact 1 to be tested is disconnected, the test is repeated many times, the control circuit 7 records and stores whether the contact 1 to be tested is bonded, and records the voltage change at both ends of the discharge resistor 4.

[0019] The first filter capacitor 3 is one or more capacitors connected in parallel.

[0020] The control circuit 7 at least includes a processor 9 and a display 10. The processor 9 has multiple A / D input ports, one of which is electrically connected to the discharge resistor 4 for obtaining the voltage or current signal of the discharge resistor 4; the other A / D input port is electrically connected to the measured contact 1 for obtaining the voltage or current signal of the measured contact 1. The display 10 is used to display the voltage waveform of the measured contact 1 and / or the discharge resistor 4.

[0021] The control circuit 7 belongs to the existing circuit control technology, and the specification does not add too detailed drawings. Example 2

[0022] like Figure 2 and Figure 3As shown, the present invention relates to a test method for the fusion welding property of a signal relay contact material, comprising: a silicon rectifier 2, a first filter capacitor 3, a second filter capacitor 6, and a discharge resistor 4, a switch 11 of a signal relay 5 is connected between the first filter capacitor 3 and the discharge resistor 4, the disconnection point of the switch 11 is a contact 1 to be tested, the signal relay 5 is electrically connected to a control circuit 7, the discharge resistor 4 is electrically connected to the control circuit 7, the signal relay 5 is controlled to be turned on and off by the control circuit 7, the control circuit 7 also records the relay action state, the two ends of the discharge resistor 4 are electrically connected to a processor 9 of the control circuit 7, the discharge resistor 4 is connected in series with the second filter capacitor 6, the second filter capacitor 6 is connected in parallel with an inductor L8, when the signal relay 5 is not connected, the silicon rectifier 2 rectifies, the first filter capacitor 3 is charged, and when a certain input peak voltage is reached, the charging current I = 0, the control circuit 7 controls the closing of the signal relay 5, the signal relay 5 is sucked up, the contact 1 to be tested is connected, the first filter capacitor 3 is connected through the contact 1 to be tested and the discharge resistor 4 and the second filter capacitor 6 and the parallel inductor L8 8 discharges, and the second filter capacitor 6 at the rear end of the measured contact 1 begins to charge. Since the voltage on the second filter capacitor 6 at the rear end cannot change suddenly, and the current on the inductor L8 cannot change suddenly, the second filter capacitor 6 at the rear end is equivalent to a short circuit at this time, and the inductor L8 is equivalent to an open circuit. At this time, a pulse current is generated through the measured contact 1, and the control circuit 7 disconnects the relay switch 11. The relay falls, the measured contact 1 is disconnected, and the second filter capacitor 6 at the rear end discharges through the inductor L8 coil. After the relay falls and the charge of the second filter capacitor 6 at the rear end is discharged, the control circuit 7 closes the switch 11 again, and repeats the test many times. The display 10 is used to display the voltage waveform of the measured contact 1 or the discharge resistor 4.

[0023] The first filter capacitor 3 and the second filter capacitor 6 are one or more capacitors connected in parallel.

[0024] The control circuit 7 at least includes a processor 9 and a display 10. The processor 9 has multiple A / D input ports, one of which is electrically connected to the discharge resistor 4 for obtaining the voltage or current signal of the discharge resistor 4; the other A / D input port is electrically connected to the measured contact 1 for obtaining the voltage or current signal of the measured contact 1. The display 10 is used to display the voltage waveform of the measured contact 1 and / or the discharge resistor 4.

[0025] The control circuit 7 belongs to the existing circuit control technology, and the specification does not add too detailed drawings.

Claims

1. A method for testing the weldability of a signal relay contact material, characterized in that: at least include: A silicon rectifier (2), a first filter capacitor (3), and a discharge resistor (4), wherein the discharge resistor (4) forms a discharge circuit, a control circuit (7) is provided at both ends of a signal relay (5), a switch (11) of the signal relay (5) is connected between the first filter capacitor (3) and the discharge resistor (4), the switch (11) is connected to a disconnection point as a measured contact (1), the signal relay (5) and the control circuit (7) are electrically connected, the discharge resistor (4) and the control circuit (7) are electrically connected, the control circuit (7) controls the signal relay (5) to be turned on and off, and the control circuit (7) records the state information of the measured contact (1), a power supply is connected to the input end of the silicon rectifier (2), and the first filter capacitor (3) is connected in parallel to the output end of the silicon rectifier (2); when the signal relay (5) is not connected, the silicon rectifier (2) rectifies, the first filter capacitor (3) is charged, and when a certain input peak voltage is reached, the charging current I =0, the control circuit (7) controls the closing signal relay (5), the signal relay (5) is attracted, the contact (1) to be tested is connected, the first filter capacitor (3) is discharged through the contact (1) to be tested and the discharge resistor (4), a pulse current is generated at both ends of the discharge resistor (4) and passes through the contact (1) to be tested and the discharge resistor (4), the signal relay (5) is disconnected, the contact (1) to be tested is disconnected, the test is repeated multiple times, and the control circuit (7) records the number of times the signal relay (5) is actuated and whether the contact (1) to be tested is bonded; the control circuit (7) at least comprises a processor (9) and a display (10), the processor (9) having multiple A / D input ports, one of which is electrically connected to the discharge resistor (4) for obtaining a voltage or current signal of the discharge resistor (4); another A / D input port is electrically connected to the contact (1) to be tested for obtaining a voltage or current signal of the contact (1) to be tested, and the display (10) is used to display the voltage waveform of the contact (1) to be tested or / and the discharge resistor (4).

2. A method for testing the weldability of a signal relay contact material according to claim 1, characterized in that: The discharge resistor (4) is connected in parallel with the negative end of the power supply to a second filter capacitor (6), and the second filter capacitor (6) is connected in parallel to an inductor L (8) coil. When the signal relay (5) is not turned on, the silicon rectifier (2) rectifies and the first filter capacitor (3) is charged. When a certain input peak voltage is reached, the charging current I = 0. The control circuit (7) controls the closing signal relay (5), the signal relay (5) is attracted, the contact (1) to be tested is connected, the first filter capacitor (3) is discharged through the contact (1) to be tested and the discharge resistor (4) and the second filter capacitor (6) and the parallel inductor L (8), and the second filter capacitor (6) at the rear end of the contact (1) to be tested begins to charge. Since the voltage on the second filter capacitor (6) at the rear end cannot change suddenly, and the current on the inductor L (8) cannot change suddenly, the second filter capacitor (6) at the rear end is equivalent to a short circuit, and the inductor L (8) is equivalent to an open circuit. At this time, a pulse current is generated through the contact (1) to be tested, the control circuit (7) disconnects the relay switch (11), the relay falls, the contact (1) to be tested is disconnected, and the second filter capacitor (6) at the rear end is discharged through the inductor L (8). After the relay falls and the charge of the second filter capacitor (6) at the rear end is discharged, the switch is closed again, and the test is repeated for multiple times, and the number of actions of the signal relay (5) and whether the contact (1) to be tested is bonded are recorded.

3. A method for testing the weldability of a signal relay contact material according to claim 1, characterized in that: The first filter capacitor (3) is one or more capacitors connected in parallel.

4. A method for testing the weldability of a signal relay contact material according to claim 2, characterized in that: The second filter capacitor (6) is one or more capacitors connected in parallel.

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