CN202119468U - Portable on-line test and fault diagnosis system - Google Patents

Abstract

The utility model discloses a portable on-line test and fault diagnosis system, which comprises a signal conditioning circuit, a digital signal acquisition circuit, an analog signal acquisition circuit, a computer system and an LCD display. The signal conditioning circuit is composed of an analog switch selection array, an analog signal conversion circuit and Composition of digital signal conversion circuit; the input end of the analog switch selection array is connected to the measured object, its output end is respectively connected to the input end of the digital signal conversion circuit and the analog signal conversion circuit, and the output end of the digital signal conversion circuit and the analog signal conversion circuit They are respectively connected to the input ends of the digital signal acquisition circuit and the analog signal acquisition circuit, the output ends of the digital signal acquisition circuit and the analog signal acquisition circuit are respectively connected to the input ends of the computer system, and the output ends of the computer system are connected to the LCD display. The utility model can realize on-line accurate testing of various objects to be tested, and at the same time can realize real-time fault diagnosis of the objects to be tested.

Description

A Portable Online Test and Fault Diagnosis System

technical field

The utility model relates to a portable on-line test and fault diagnosis system, which is suitable for the technical field of electromechanical measurement.

Background technique

With the continuous improvement of the automation of modern electromechanical equipment, various signals inside the electromechanical equipment are complex. In order to improve the reliability and maintainability of electromechanical equipment, a lot of testing and diagnosis work is usually required. Online testing technology is an important supporting technology to ensure the normal operation of electromechanical equipment. The online testing capability directly affects the quality of the complete equipment, and its fault diagnosis ability directly affects the comprehensive indicators of the complete machine. Therefore, on-line testing and fault diagnosis of electromechanical equipment has become an important field of modern testing technology research. At present, most of the on-line test systems have relatively single functions, mainly on-line monitoring, and there are few automatic test systems with fast fault identification.

For the online test system, there are currently two types of test equipment in China. One is a special test equipment for a certain type of specific test object. The main hardware is composed of 51 series single-chip microcomputers and other peripheral devices. Through some signal acquisition circuits, complete The signal monitoring of the measured object has low work efficiency and low accuracy; the other is to use standard test instruments, such as virtual instruments based on VXI, PXI and other bus interfaces, to build a test system based on standard bus instruments, but such The system is not only expensive, but also because standard instruments are mainly used for common use, they cannot be optimally configured, resulting in a serious waste of resources. At the same time, it is often necessary to add a large number of matrix switch modules or signal transfer modules, resulting in high system costs and bulky volume. Bring inconvenience to use.

Utility model content

The technical problem to be solved by the utility model is to provide a portable online testing and fault diagnosis system.

In order to solve the above-mentioned technical problems, the technical solution adopted in the utility model is: comprise signal conditioning circuit, digital signal acquisition circuit, analog signal acquisition circuit, computer system and LCD display, described signal conditioning circuit is selected array by analog switch, analog signal conversion circuit and a digital signal conversion circuit; the input end of the analog switch selection array is connected to the measured object, and its output end is connected to the input end of the digital signal conversion circuit and the analog signal conversion circuit respectively, and the digital signal conversion circuit and the analog signal conversion The output ends of the circuit are respectively connected with the input ends of the digital signal acquisition circuit and the analog signal acquisition circuit, the output ends of the digital signal acquisition circuit and the analog signal acquisition circuit are respectively connected with the input ends of the computer system, and the output ends of the computer system are connected with the LCD display .

The analog switch selection array adopts Agilent U2751A USB modular switch matrix.

The digital signal conversion circuit is composed of four identical input circuits, four identical output circuits, comparator U1 and its peripheral components diode D1 and resistor R17, and the first input circuit is composed of resistor R1 and resistor R2, so Described first output circuit is made up of optocoupler U2, resistance R3 and resistance R4; One end of described resistance R1 and resistance R2 is connected in series with the output end of analog switch selection array, and its other end is grounded, and the node of resistance R1 and R2 and The input terminal 5 pin of the comparator U1 is connected; the cathode of the diode of the photocoupler U2 is connected with the output terminal 2 pin of the comparator U1, and its anode is connected to VCC through the resistor R3, and the base of the triode of the photocoupler U2 The resistor R4 is connected to VCC, its collector is connected to the input terminal of the digital signal acquisition circuit, and its emitter is grounded; the power supply terminal 3 of the comparator U1 is connected to VCC, and its 4 feet, 6 feet, 8 feet and 10 feet After being connected in parallel, it is connected to VCC through a resistor R17, the cathode of the diode D1 is connected to pin 4 of the comparator U1, and its anode is grounded.

The analog signal conversion circuit is composed of an isolation amplifier U6, a power module U7 and capacitors C1-C7; the input terminal of the isolation amplifier U6 is connected to the output terminal of the analog switch selection array, and its output terminal is connected to the analog signal acquisition circuit The input terminal of the power module U7 is connected to a DC 15V power supply, and its output terminal is respectively connected to the power supply terminals VDD1, GND1 and VSS1 of the isolation amplifier U6; the capacitors C1-C7 are filter capacitors.

The digital signal acquisition circuit is composed of CDT800 digital I/O expansion module and SCM/LX-3160 module.

The analog signal acquisition circuit is composed of SEM/ADT-620 module and SCM/LX-3160 module.

The model of the above-mentioned comparator U1 is LM139, the model of the optocoupler U2 is 6N137; the model of the above-mentioned isolation amplifier U6 is ISO124P, and the model of the power module U7 is DCP011515DB.

The utility model can realize the online test and fault diagnosis of the following parameters: (1) It can isolate and collect the analog quantity below 100M; (2) It can isolate and collect the switch signal below 100M; Weak signals of >5mV from various sensors are isolated and collected; (4) It can judge the working status of the measured object and locate the fault.

The beneficial effect of adopting the above technical solution is that the analog signal is isolated and amplified by the analog signal conversion circuit and sent to the analog signal acquisition circuit, and the digital signal is isolated and level matched by the digital signal conversion circuit and sent to the digital signal. The signal acquisition circuit is sent to the computer system, and the computer system analyzes and processes the input signal through the detection software, and displays the signal state on the LCD display. The utility model can realize on-line accurate testing of various objects to be tested, and at the same time can realize real-time fault diagnosis of the objects to be tested.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is the circuit principle block diagram of the present utility model;

Fig. 2 is a schematic diagram of a digital signal conversion circuit of the present invention;

Fig. 3 is a schematic diagram of the analog signal conversion circuit of the present invention.

Detailed ways

As shown in Fig. 1, a kind of portable on-line test and fault diagnosis system described in the utility model includes signal conditioning circuit, digital signal acquisition circuit, analog signal acquisition circuit, computer system and LCD display, and described signal conditioning circuit is composed of analog Composed of a switch selection array, an analog signal conversion circuit and a digital signal conversion circuit; the input end of the analog switch selection array is connected to the measured object, and its output end is respectively connected to the input ends of the digital signal conversion circuit and the analog signal conversion circuit, and the digital signal conversion circuit The output ends of the signal conversion circuit and the analog signal conversion circuit are respectively connected with the input ends of the digital signal acquisition circuit and the analog signal acquisition circuit, and the output ends of the digital signal acquisition circuit and the analog signal acquisition circuit are respectively connected with the input ends of the computer system, and the computer system The output terminal is connected to the LCD display.

The analog switch selection array adopts Agilent U2751A USB modular switch matrix.

As shown in Figure 2, the digital signal conversion circuit is composed of four identical input circuits, four identical output circuits, comparator U1 and its peripheral components diode D1 and resistor R17, the first input circuit is composed of resistor R1 Composed of resistor R2, the first output circuit is composed of photocoupler U2, resistor R3 and resistor R4; one end of the series connection of the resistor R1 and resistor R2 is connected to the output end of the analog switch selection array, the other end is grounded, and the resistor The node of R1 and R2 is connected with the input terminal 5 pin of the comparator U1; the cathode of the diode of the photocoupler U2 is connected with the output terminal 2 pin of the comparator U1, and its anode is connected to VCC through the resistor R3, and the photocoupler The base of the triode of U2 is connected to VCC through resistor R4, its collector is connected to the input terminal of the digital signal acquisition circuit, and its emitter is grounded; the power supply terminal 3 of the comparator U1 is connected to VCC, and its 4 and 6 feet , pin 8 and pin 10 are connected in parallel to VCC through a resistor R17, the cathode of the diode D1 is connected to pin 4 of the comparator U1, and its anode is grounded.

As shown in Figure 3, described analog signal conversion circuit is made up of isolation amplifier U6, power supply module U7 and capacitor C1-C7; The input end of described isolation amplifier U6 is connected the output end of described analog switch selection array, and its output end is connected The input terminal of the analog signal acquisition circuit; the input terminal of the power supply module U7 is connected to a DC 15V power supply, and its output terminal is respectively connected to the power supply terminals VDD1, GND1 and VSS1 of the isolation amplifier U6; the capacitors C1-C7 are for filtering capacitance.

The digital signal acquisition circuit is composed of CDT800 digital I/O expansion module and SCM/LX-3160 module.

The analog signal acquisition circuit is composed of SEM/ADT-620 module and SCM/LX-3160 module.

The model of the above-mentioned comparator U1 is LM139, the model of the optocoupler U2 is 6N137; the model of the above-mentioned isolation amplifier U6 is ISO124P, and the model of the power module U7 is DCP011515DB.

In summary, the utility model receives signals through the interface circuit, isolates and amplifies the analog signals, isolates the digital signals, performs level matching processing, and sends them to the computer system; the computer system collects signals through the digital interface and the analog interface , and after the analysis and processing of the detection software, the state of the signal is displayed on the LCD display. The utility model can realize on-line accurate testing of various objects to be tested, and at the same time can realize real-time fault diagnosis of the objects to be tested.

Claims (6)

1. portable on-line testing and fault diagnosis system; It is characterized in that: comprise signal conditioning circuit, digital signal acquiring circuit, collection of simulant signal circuit, the department of computer science LCD display of unifying, said signal conditioning circuit selects array, analog signal conversion and digital signal change-over circuit to form by analog switch; The input end of said analog switch selection array is connected with measurand, its output terminal is connected with the input end of digital signal change-over circuit and analog signal conversion respectively; The output terminal of digital signal change-over circuit and analog signal conversion is connected with the input end of digital signal acquiring circuit with the collection of simulant signal circuit respectively; The output terminal of digital signal acquiring circuit and collection of simulant signal circuit is connected with the input end of computer system respectively, and the output terminal of computer system is connected with LCD display.

2. a kind of portable on-line testing according to claim 1 and fault diagnosis system is characterized in that: said analog switch selects array to adopt Agilent U2751A USB modular switch matrix.

3. a kind of portable on-line testing according to claim 2 and fault diagnosis system; It is characterized in that: said digital signal change-over circuit is made up of four tunnel identical input circuit, four tunnel identical output circuit, comparer U1 and peripheral cell diode D1 thereof and resistance R 17; Said first input circuit is made up of resistance R 1 and resistance R 2, and said first output circuit is made up of photoelectrical coupler U2, resistance R 3 and resistance R 4; Termination analog switch after said resistance R 1 is connected with resistance R 2 is selected output terminal, its other end ground connection of array, and resistance R 1 is connected with input end 5 pin of comparer U1 with the node of R2; The negative electrode of the diode of said photoelectrical coupler U2 is connected with output terminal 2 pin of comparer U1; Its anode meets VCC through resistance R 3; The base stage of the triode of said photoelectrical coupler U2 meets VCC through resistance R 4, and its collector connects the input end of said digital signal acquiring circuit, its grounded emitter; Power end 3 pin of said comparer U1 meet VCC, are connected with VCC through resistance R 17 after its 4 pin, 6 pin, 8 pin and the 10 pin parallel connections, and the negative pole of said diode D1 connects 4 pin, its plus earth of said comparer U1.

4. a kind of portable on-line testing according to claim 3 and fault diagnosis system is characterized in that: said analog signal conversion is made up of isolated amplifier U6, power module U7 and capacitor C 1-C7; The said analog switch of the input termination of said isolated amplifier U6 is selected the output terminal of array, the input end of the said collection of simulant signal circuit of its output termination; The input termination direct current 15V power supply of said power module U7, its output terminal meets power end VDD1, GND1 and the VSS1 of said isolated amplifier U6 respectively; Said capacitor C 1-C7 is a filter capacitor.

5. a kind of portable on-line testing according to claim 4 and fault diagnosis system is characterized in that: said digital signal acquiring circuit is made up of CDT800 digital quantity I/O expansion module and SCM/LX-3160 module.

6. a kind of portable on-line testing according to claim 5 and fault diagnosis system is characterized in that: said collection of simulant signal circuit is made up of SEM/ADT-620 module and SCM/LX-3160 module.

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