Dual-redundancy proximity switch testing device

Abstract

The invention provides a dual-redundancy type proximity switch testing device. The dual-redundancy type proximity switch testing device comprises a shell and a cover plate covering an opening in the top of the shell. A power socket is fixedly installed on the inner side wall of the shell through screws, a circuit module is fixedly installed at the bottom of the shell through screws, and a control switch, a voltmeter, an ampere meter, an indicator lamp and a triple jointing clamp are installed at the top of the cover plate. Through the AC-DC power supply with EMC, the test device has the functions of over-current protection, over-temperature protection, short-circuit protection and the like, output voltage ripples can be reduced, stable voltage can be provided for the tested proximity switch, and the reliability of the test device is improved; meanwhile, an MOS tube is used as a response switch in the circuit module, so that the accuracy of the product when indexes such as consumed current and load current are measured is improved; besides, two sets of identical test circuits are designed, so that the test device can detect two paths of signals of the dual-redundancy proximity switch at the same time, and the detection efficiency of the dual-redundancy proximity switch is improved.

Description

Technical Field

[0001] The invention relates to a dual-redundancy proximity switch testing device. Background Art

[0002] Proximity switch is also called proximity sensor or contactless position switch. It is a position switch that can be operated without mechanical contact with moving parts. When the moving body approaches the switch to a certain position, the switch sends an electrical signal, which converts the movement information and existence information of the detected object into electrical signals, thereby realizing signal transmission and control. It has the characteristics of no mechanical wear and fatigue damage, high product positioning accuracy, stable performance, long service life, low power consumption, strong working reliability, and fast response.

[0003] The output voltage ripple of the power module of the existing proximity switch test device is large, that is, the power supply voltage of the proximity switch being tested is unstable, which is easy to cause damage to the switch, and the state display circuit module has a large shunt, which has a great impact on the current indicators of the proximity switch being tested, such as consumption current, load current, etc., and reduces the accuracy of detection. At the same time, there is currently a lack of testing devices that can simultaneously detect dual-redundancy proximity switches. For example, a leakage current automatic test device for a proximity switch disclosed in CN222561736U uses a depletion-type MOSFET for current limiting protection to prevent the digital potentiometer from being damaged when the proximity switch or proximity sensor is triggered by mistake, solving the problem that the digital potentiometer cannot directly replace the load resistor; a current-voltage conversion circuit is used, and the virtual ground function of the operational amplifier circuit is used to convert the input current into a test voltage to ensure the load is accurate and improve the measurement progress; a current source calibration circuit is added, and the calibrated current source can calibrate and self-check the measurement part circuit, which is convenient for automated testing. However, its power supply end does not have overcurrent protection, overtemperature protection and short-circuit protection functions, making the switch being tested easily damaged. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a dual-redundancy proximity switch testing device.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a dual-redundancy proximity switch testing device, comprising a shell and a cover plate covering the top opening thereof; a power socket is fixedly installed on the inner side wall of the shell by screws, a circuit module is fixedly installed on the bottom of the shell by screws, a control switch, a voltmeter, an ammeter, an indicator light and a three-way wiring clamp are installed on the top of the cover plate, the circuit module is connected with the power socket, the control switch, the voltmeter, the ammeter, the indicator light and the three-way wiring clamp through wires, and the three-way wiring clamp is used to connect two signals of the dual-redundancy proximity switch to be tested.

[0007] The cover plate is connected to the outer shell by screws, and a groove and a threaded hole are provided on the cover plate; the control switch, indicator light and three-way wiring clamp are fixed in the groove of the cover plate by nuts and screws respectively, and the voltmeter and ammeter are fixed to the installation opening of the cover plate by their own buckles.

[0008] Two sets of independent signal transmission circuits are printed on the circuit module, each set of signal transmission circuits includes an AC-DC power conversion circuit, a switch detection circuit and a status display circuit, and is used to simultaneously detect two signals of the dual-redundancy proximity switch.

[0009] The AC-DC power conversion circuit includes a power module M1, whose pin 1 and pin 2 are respectively connected to the pin 2 and pin 3 of the common mode inductor L2; the pin 1 of the common mode inductor L2 is connected in series with the NTC resistor RT1 and the fuse F1 and then connected to the live wire, and the pin 4 is directly connected to the neutral wire; the pins 1 and 4 of the common mode inductor L2 are connected in parallel with the safety X capacitor CX1, the varistor R6 and the bleeder resistor R4; the pins 1 and 2 of the power module M1 are respectively connected in series with the safety Y capacitors CY1 and CY2 and then grounded.

[0010] Pin 3 of the power module M1 is connected to pin 4, and pin 5 is connected to pin 6; pin 3 and pin 5 are connected in parallel to capacitor C3 and electrolytic capacitor CE1, pin 1 of electrolytic capacitor CE1 is connected in series with rod inductor LDM1 and then connected in parallel to electrolytic capacitor CE2 and capacitor C4; pin 1 and pin 2 of the electrolytic capacitor CE2 are connected to pin 2 and pin 3 of the toroidal inductor respectively, pin 1 and pin 4 of the toroidal inductor are connected in parallel to capacitor C5 and electrolytic capacitor CE3, and pin 1 of electrolytic capacitor CE3 is connected to power supply terminal VCC0 and pin 1 of control switch SW1, and pin 2 is connected to pin 3 of control switch SW1, pin 3 of control switch SW1 is grounded, and pin 2 is connected to power supply terminal VCC.

[0011] The switch detection circuit includes wiring terminals JP2 and JP4, wherein pin 1 of wiring terminal JP2 is connected to pin 4 of ammeter DLB1, and pin 2 of wiring terminal JP2 is connected to pin 2 of wiring terminal JP1; pin 1 of wiring terminal JP1 is connected to pin 3 of ammeter DLB2 via resistors R1 and R2; pin 1 of ammeter DLB1 and pin 1 of DLB2 are both connected to power supply terminal VCC0, and pins 2 and 4 of them are grounded; pin 3 of voltmeter DYB1 is connected to pin 1 of wiring terminal JP1, and pin 4 of voltmeter DYB1 is connected to pin 3 of ammeter DLB2.

[0012] In the switch detection circuit, pin 1 of terminal JP4 is connected to pin 4 of ammeter DLB3, and pin 2 of terminal JP4 is connected to pin 2 of terminal JP3; pin 1 of terminal JP3 is connected to pin 3 of ammeter DLB4 through resistors R7 and R8; pin 1 of ammeter DLB3 and pin 1 of DLB4 are both connected to power supply terminal VCC0, and pins 2 and 4 of them are grounded; pin 3 of voltmeter DYB2 is connected to pin 1 of terminal JP3, and pin 4 of voltmeter DYB2 is connected to pin 3 of ammeter DLB4.

[0013] The status display circuit includes three-terminal regulators W1 and W2, wherein the 1 pin of the three-terminal regulator W1 is connected to the power supply terminal VCC through a resistor R3, and the 3 pin thereof is connected to the D terminal of the MOS tube through a resistor R5 and a light-emitting diode LED1, and is connected to the D terminal of the MOS tube through a diode D1; the 3 pin of the three-terminal regulator W1 is also connected to the 1 pin of the relay J1, and the 2 pin of the relay J1 is connected to the D terminal of the MOS tube; the G terminal of the MOS tube is connected to the 1 pin of the resistor R2, and the S terminal is grounded.

[0014] In the state display circuit, the connection mode of the three-terminal voltage regulator W2 is exactly the same as that of the three-terminal voltage regulator W1, and the two sets of state display circuits correspond to the two signal detections of the dual-redundancy proximity switch respectively.

[0015] The AC-DC power conversion circuit of the circuit module integrates EMC filtering function, and has overcurrent protection, overtemperature protection and short circuit protection functions, and the output voltage ripple is less than 50mV, providing a stable power supply for the proximity switch under test.

[0016] The beneficial effects of the present invention are as follows: while the AC-DC power supply with EMC enables the test device to have functions such as overcurrent protection, overtemperature protection and short-circuit protection, it can reduce the output voltage ripple, provide a stable voltage to the proximity switch under test, and improve the reliability of the test device; at the same time, MOS tubes are used as response switches in the circuit module, which improves the accuracy of the product when measuring indicators such as consumption current and load current; in addition, two sets of identical test circuits are designed, so that the test device can simultaneously detect two signals of the dual-redundancy proximity switch, thereby improving the detection efficiency of the dual-redundancy proximity switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the principle structure of the circuit module of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the power module of the present invention;

[0020] Figure 4It is a schematic diagram of the test circuit structure of the present invention;

[0021] In the figure: 1-housing, 2-circuit module, 3-cover, 4-control switch, 5-voltmeter, 6-ammeter, 7-indicator light, 8-three-connection wiring clamp, 9-power socket. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0023] The present invention discloses a dual-redundancy proximity switch test device, comprising a housing 1 and a cover plate 3 covering the top opening thereof; a power socket 9 is fixedly installed on the inner side wall of the housing 1 by screws, a circuit module 2 is fixedly installed on the bottom of the housing 1 by screws, a control switch 4, a voltmeter 5, an ammeter 6, an indicator light 7 and a three-way wiring clamp 8 are installed on the top of the cover plate, and the circuit module 2 is connected to the power socket 9, the control switch 4, the voltmeter 5, the ammeter 6, the indicator light 7 and the three-way wiring clamp 8 by wires, and the three-way wiring clamp 8 is used to connect the two-way signals of the dual-redundancy proximity switch to be tested. The modular design fixes each component by screws to ensure the stability of the overall structure of the device and reduce poor contact caused by vibration or external force; the three-way wiring clamp 8 directly connects the two-way signals of the dual-redundancy proximity switch to achieve dual-channel synchronous detection and significantly improve the test efficiency.

[0024] Furthermore, the cover plate 3 is connected to the housing 1 by screws, and a groove and a threaded hole are provided on the cover plate 3; the control switch 4, the indicator light 7 and the three-way wiring clamp 8 are fixed in the groove of the cover plate 3 by nuts and screws respectively, and the voltmeter 5 and the ammeter 6 are fixed to the installation opening of the cover plate 3 by their own buckles. The design of the groove and the threaded hole simplifies the component installation process and reduces the complexity of assembly; the buckle-type fixing of the voltmeter and the ammeter avoids the risk of instrument damage caused by welding or gluing, and is convenient for later maintenance and replacement.

[0025] Furthermore, two sets of independent signal transmission circuits are printed on the circuit module 2, each of which includes an AC-DC power conversion circuit, a switch detection circuit and a status display circuit, which are used to simultaneously detect two signals of the dual-redundancy proximity switch. The dual independent circuit design supports the synchronous detection of the dual-redundancy proximity switch, eliminates signal interference, ensures the independence of the two-way data collection, and improves the accuracy and reliability of the detection results.

[0026] Furthermore, the AC-DC power conversion circuit includes a power module M1, whose pin 1 and pin 2 are respectively connected to the pin 2 and pin 3 of the common mode inductor L2; the pin 1 of the common mode inductor L2 is connected in series with the NTC resistor RT1 and the fuse F1 and then connected to the live wire, and the pin 4 is directly connected to the neutral wire; the pins 1 and 4 of the common mode inductor L2 are connected in parallel with the safety X capacitor CX1, the varistor R6 and the bleeder resistor R4; the pins 1 and 2 of the power module M1 are respectively connected in series with the safety Y capacitors CY1 and CY2 and then grounded. The combination of the common mode inductor and the safety capacitor effectively suppresses electromagnetic interference (EMI), the NTC resistor and the fuse provide overcurrent protection, and the varistor absorbs surge voltage, ensuring that the power input is stable and meets safety standards, and reducing the risk of damage to the switch under test.

[0027] Further, the 3rd pin of the power module M1 is connected to the 4th pin, and the 5th pin is connected to the 6th pin; the 3rd pin and the 5th pin are connected in parallel with the capacitor C3 and the electrolytic capacitor CE1, and the 1st pin of the electrolytic capacitor CE1 is connected in series with the rod-shaped inductor LDM1 and then connected in parallel with the electrolytic capacitor CE2 and the capacitor C4; the 1st pin and the 2nd pin of the electrolytic capacitor CE2 are connected to the 2nd pin and the 3rd pin of the toroidal inductor respectively, and the 1st pin and the 4th pin of the toroidal inductor are connected in parallel with the capacitor C5 and the electrolytic capacitor CE3, and the 1st pin of the electrolytic capacitor CE3 is connected to the power supply terminal VCC0 and the 1st pin of the control switch SW1, and the 2nd pin is connected to the 3rd pin of the control switch SW1, and the 3rd pin of the control switch SW1 is grounded, and the 2nd pin is connected to the power supply terminal VCC. The multi-stage filtering network (electrolytic capacitor, rod-shaped inductor, toroidal inductor) significantly reduces the output voltage ripple (<50mV), provides a pure DC power supply for the proximity switch to be tested, and improves the test accuracy; the control switch SW1 is designed to be linked with the power supply terminal to achieve a fast response of the power supply on and off, and enhance the safety of operation.

[0028] Furthermore, the switch detection circuit includes terminals JP2 and JP4, wherein the 1st pin of the terminal JP2 is connected to the 4th pin of the ammeter DLB1, and the 2nd pin thereof is connected to the 2nd pin of the terminal JP1; the 1st pin of the terminal JP1 is connected to the 3rd pin of the ammeter DLB2 through resistors R1 and R2; the 1st pin of the ammeter DLB1 and the 1st pin of DLB2 are both connected to the power supply terminal VCC0, and the 2nd and 4th pins thereof are grounded; the 3rd pin of the voltmeter DYB1 is connected to the 1st pin of the terminal JP1, and the 4th pin thereof is connected to the 3rd pin of the ammeter DLB2. The resistor voltage divider and multi-meter linkage design accurately measure the current and voltage parameters and reduce the shunt error; the standardized layout of the terminal simplifies the access process of the switch under test and improves the test efficiency.

[0029] Furthermore, in the switch detection circuit, pin 1 of terminal JP4 is connected to pin 4 of ammeter DLB3, and pin 2 of terminal JP3 is connected to pin 2 of terminal JP3; pin 1 of terminal JP3 is connected to pin 3 of ammeter DLB4 through resistors R7 and R8; pin 1 of ammeter DLB3 and pin 1 of DLB4 are both connected to power supply terminal VCC0, and pins 2 and 4 of them are grounded; pin 3 of voltmeter DYB2 is connected to pin 1 of terminal JP3, and pin 4 of voltmeter DYB2 is connected to pin 3 of ammeter DLB4. The symmetrical circuit design supports dual-redundancy signal synchronous detection, eliminates the influence of single-point failure through redundant measurement, and improves the fault tolerance and data consistency of the test device.

[0030] Furthermore, the status display circuit includes three-terminal voltage regulators W1 and W2, wherein the 1 pin of the three-terminal voltage regulator W1 is connected to the power supply terminal VCC through a resistor R3, and the 3 pin thereof is connected to the D terminal of the MOS tube through a resistor R5 and a light-emitting diode LED1, and is connected to the D terminal of the MOS tube through a diode D1; the 3 pin of the three-terminal voltage regulator W1 is also connected to the 1 pin of the relay J1, and the 2 pin of the relay J1 is connected to the D terminal of the MOS tube; the G terminal of the MOS tube is connected to the 1 pin of the resistor R2, and the S terminal is grounded. The three-terminal voltage regulator works in coordination with the MOS tube to ensure the fast response and low power consumption characteristics of the status indication circuit; the light-emitting diode (LED1) is linked with the relay J1 to intuitively display the switch state and realize signal isolation, thereby enhancing system reliability.

[0031] Furthermore, in the status display circuit, the connection mode of the three-terminal voltage regulator W2 is exactly the same as that of the three-terminal voltage regulator W1, and the two sets of status display circuits correspond to the two-way signal detection of the dual-redundancy proximity switch. The dual-way independent status display circuit avoids signal cross-interference, ensures the independence and real-time performance of the two-way detection results, and meets the high reliability requirements of the dual-redundancy system.

[0032] Furthermore, the AC-DC power conversion circuit of circuit module 2 integrates EMC filtering function, and has overcurrent protection, overtemperature protection and short-circuit protection functions, and the output voltage ripple is less than 50mV, providing a stable power supply for the proximity switch under test. The integrated multiple protection mechanisms (overcurrent, overtemperature, short circuit) effectively prevent accidental damage during the test; EMC filtering and low ripple output (<50mV) ensure stable power supply for the switch under test, improving the accuracy and repeatability of the test data.

Claims

1. A dual-redundancy proximity switch test device, characterized in that : It comprises a shell (1) and a cover plate (3) covering the top opening thereof, characterized in that: a power socket (9) is fixedly mounted on the inner side wall of the shell (1) by screws, a circuit module (2) is fixedly mounted on the bottom of the shell (1) by screws, a control switch (4), a voltmeter (5), an ammeter (6), an indicator light (7) and a three-way wiring clamp (8) are mounted on the top of the cover plate, the circuit module (2) is connected to the power socket (9), the control switch (4), the voltmeter (5), the ammeter (6), the indicator light (7) and the three-way wiring clamp (8) by wires, and the three-way wiring clamp (8) is used to connect two signals of the double-redundancy proximity switch to be tested.

2. The dual-redundancy proximity switch testing device according to claim 1, characterized in that: The cover plate (3) is connected to the housing (1) by means of screws, and a groove and a threaded hole are provided on the cover plate (3); the control switch (4), the indicator light (7) and the three-way wiring clamp (8) are fixed in the groove of the cover plate (3) by means of nuts and screws respectively, and the voltmeter (5) and the ammeter (6) are fixed to the installation opening of the cover plate (3) by means of their own buckles.

3. The dual-redundancy proximity switch testing device according to claim 1, characterized in that: The circuit module (2) is printed with two sets of independent signal transmission circuits, each set of signal transmission circuits includes an AC-DC power conversion circuit, a switch detection circuit and a status display circuit, and is used to simultaneously detect two signals of a dual-redundancy proximity switch.

4. The dual-redundancy proximity switch testing device according to claim 3, characterized in that: The AC-DC power conversion circuit includes a power module M1, whose pin 1 and pin 2 are respectively connected to the pin 2 and pin 3 of the common mode inductor L2; the pin 1 of the common mode inductor L2 is connected in series with the NTC resistor RT1 and the fuse F1 and then connected to the live wire, and the pin 4 is directly connected to the neutral wire; the pins 1 and 4 of the common mode inductor L2 are connected in parallel with the safety X capacitor CX1, the varistor R6 and the bleeder resistor R4; the pins 1 and 2 of the power module M1 are respectively connected in series with the safety Y capacitors CY1 and CY2 and then grounded.

5. The dual-redundancy proximity switch testing device according to claim 4, characterized in that: Pin 3 of the power module M1 is connected to pin 4, and pin 5 is connected to pin 6; pin 3 and pin 5 are connected in parallel to capacitor C3 and electrolytic capacitor CE1, pin 1 of electrolytic capacitor CE1 is connected in series with rod inductor LDM1 and then connected in parallel to electrolytic capacitor CE2 and capacitor C4; pin 1 and pin 2 of the electrolytic capacitor CE2 are connected to pin 2 and pin 3 of the toroidal inductor respectively, pin 1 and pin 4 of the toroidal inductor are connected in parallel to capacitor C5 and electrolytic capacitor CE3, and pin 1 of electrolytic capacitor CE3 is connected to power supply terminal VCC0 and pin 1 of control switch SW1, and pin 2 is connected to pin 3 of control switch SW1, pin 3 of control switch SW1 is grounded, and pin 2 is connected to power supply terminal VCC.

6. The dual-redundancy proximity switch testing device according to claim 3, characterized in that: The switch detection circuit includes wiring terminals JP2 and JP4, wherein pin 1 of wiring terminal JP2 is connected to pin 4 of ammeter DLB1, and pin 2 of wiring terminal JP2 is connected to pin 2 of wiring terminal JP1; pin 1 of wiring terminal JP1 is connected to pin 3 of ammeter DLB2 via resistors R1 and R2; pin 1 of ammeter DLB1 and pin 1 of DLB2 are both connected to power supply terminal VCC0, and pins 2 and 4 of them are grounded; pin 3 of voltmeter DYB1 is connected to pin 1 of wiring terminal JP1, and pin 4 of voltmeter DYB1 is connected to pin 3 of ammeter DLB2.

7. The dual-redundancy proximity switch testing device according to claim 6, characterized in that: In the switch detection circuit, pin 1 of terminal JP4 is connected to pin 4 of ammeter DLB3, and pin 2 of terminal JP4 is connected to pin 2 of terminal JP3; pin 1 of terminal JP3 is connected to pin 3 of ammeter DLB4 through resistors R7 and R8; pin 1 of ammeter DLB3 and pin 1 of DLB4 are both connected to power supply terminal VCC0, and pins 2 and 4 of them are grounded; pin 3 of voltmeter DYB2 is connected to pin 1 of terminal JP3, and pin 4 of voltmeter DYB2 is connected to pin 3 of ammeter DLB4.

8. The dual-redundancy proximity switch testing device according to claim 3, characterized in that: The status display circuit includes three-terminal regulators W1 and W2, wherein the 1 pin of the three-terminal regulator W1 is connected to the power supply terminal VCC through a resistor R3, and the 3 pin thereof is connected to the D terminal of the MOS tube through a resistor R5 and a light-emitting diode LED1, and is connected to the D terminal of the MOS tube through a diode D1; the 3 pin of the three-terminal regulator W1 is also connected to the 1 pin of the relay J1, and the 2 pin of the relay J1 is connected to the D terminal of the MOS tube; the G terminal of the MOS tube is connected to the 1 pin of the resistor R2, and the S terminal is grounded.

9. The dual-redundancy proximity switch testing device according to claim 8, characterized in that: In the state display circuit, the connection mode of the three-terminal voltage regulator W2 is exactly the same as that of the three-terminal voltage regulator W1, and the two sets of state display circuits correspond to the two signal detections of the dual-redundancy proximity switch respectively.

10. The dual-redundancy proximity switch testing device according to claim 1, characterized in that: The AC-DC power conversion circuit of the circuit module (2) integrates an EMC filtering function and has overcurrent protection, overtemperature protection and short-circuit protection functions, and the output voltage ripple is less than 50mV, providing a stable power supply for the proximity switch to be tested.

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