Multifunctional load data converter for strain type load sensor

Abstract

The utility model discloses a multifunctional load data converter for a strain type load sensor. The multifunctional load data converter comprises a signal conditioning module, a data acquisition module, a microcontroller, a communication module, a D / A converter and a display module, the signal conditioning module, the data acquisition module, the communication module, the D / A converter and the display module are respectively connected with the microcontroller; the data acquisition module acquires a sensor signal conditioned by the signal conditioning module and converts the signal into a digital signal, and the microcontroller is used for reading and processing A / D conversion data. According to the utility model, weak voltage signals of the load sensor can be converted into analog signals of 0-5V, 4-20mA and the like, and the analog signals can be converted into digital signals in a communication mode. And on the contrary, digital signals transmitted by other equipment in a communication mode can be converted into analog signals to be collected by other instruments or equipment, so that bidirectional conversion of the signals is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent detection, in particular to a multifunctional load data converter for a strain type load sensor. Background Art

[0002] Strain load sensors are currently the most widely used mechanical quantity measurement sensors. Due to the small output model of the sensor, its signal needs to be amplified or converted into digital quantities for various measuring instruments to collect when in use. However, different collection instruments have different requirements for the type of signal. In industrial applications, analog signals such as 0-5V and 4-20mA are the most widely used. CAN bus and RS485 are the most widely used digital communications, and USB is the most widely used for communication with the host computer. Converting the weak voltage signal of the strain sensor into the signal type required for measurement by various types of instruments can make it more convenient to use the sensor. To this end, the utility model designs a load converter with multiple signal outputs, which can convert the weak voltage signal of the load sensor into analog signals such as 0-5V, 4-20mA, and can also convert the analog signal into a digital signal with communication modes such as CAN, RS485, and USB. Conversely, the digital signal transmitted by other devices through communication modes such as CAN, RS485, and USB can also be converted into an analog signal for collection by other instruments or equipment, realizing two-way conversion of the signal. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a multifunctional load data converter for a strain type load sensor, which can realize the conversion between analog signals and analog signals, and between analog signals and digital signals, and can convert the digital signal transmitted to the converter by an external device into an analog signal output.

[0004] The purpose of the utility model is achieved through the following technical solutions: a multifunctional load data converter for a strain type load sensor, comprising a signal conditioning module, a data acquisition module, a microcontroller, a communication module, a D / A converter and a display module; the signal conditioning module, the data acquisition module, the communication module, the D / A converter and the display module are respectively connected to the microcontroller; the data acquisition module collects the sensor signal conditioned by the signal conditioning module and converts the signal into a digital signal, the microcontroller is used for reading and processing the A / D conversion data, and controls the working states of the signal conditioning module, the data acquisition module, the communication module, the D / A converter and the display module, and sends the collected data to the communication module; the display module adopts a display touch screen for displaying load data and parameter settings.

[0005] Preferably, the signal conditioning module includes a voltage amplification circuit and a V / I conversion circuit;

[0006] The voltage amplifier circuit includes an operational amplifier chip U12, a capacitor C23, a capacitor C29, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a terminal H10, a terminal H12, and a voltage regulator diode D5;

[0007] After the capacitor C23 is connected in parallel with the resistor R25, one end is connected to the wiring terminal H12 and the resistor R23, and the other end is connected to the ground; after the capacitor C29 is connected in parallel with the resistor R30, one end is connected to the resistor R29 and the pin 2 of the operational amplifier chip, and the other end is connected to the resistor R31;

[0008] One end of the resistor R23 is connected to the resistor R25, the terminal H12, and the capacitor C23, and the other end is connected to the pin 3 of the operational amplifier chip; one end of the resistor R28 is connected to the resistor R29, and the other end is connected to the ground; one end of the resistor R24 ​​is connected to the resistor R31 and the pin 1 of the operational amplifier chip, and the other end is connected to the voltage regulator diode D5 and the pin 5 of the operational amplifier chip; one end of the resistor R26 is connected to the pins 6 and 7 of the operational amplifier chip, and the other end is connected to the V / I conversion circuit.

[0009] Preferably, the V / I conversion circuit includes a resistor R35, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a wiring terminal H15, an operational amplifier chip U15, a differential operational amplifier chip U16, and a transistor U17;

[0010] One end of the resistor R35 is connected to the resistor R36 and the resistor R37, and the other end is connected to the voltage amplifier circuit; one end of the resistor R37 is connected to the pin 2 of the operational amplifier chip U15, the resistor R35 and the resistor R36, and the other end is connected to the 5V reference voltage; one end of the resistor R38 is connected to the pin 7 and the positive 15 voltage of the differential operational amplifier chip U16, and the other end is connected to the transistor U17; one end of the resistor R39 is connected to the pin 5 of the differential operational amplifier chip U16, and the other end is connected to the resistor R40; one end of the resistor R41 is connected to the resistor R40, and the other end is connected to the transistor U17 and the resistor R42; one end of the resistor R42 is connected to the resistor R43, and the other end is connected to the transistor U17 and the resistor R41; one end of the resistor R44 is connected to the resistor R43, and the other end is connected to the pin 1 of the differential operational amplifier chip U16 and a terminal H15.

[0011] Preferably, the data acquisition module includes an analog-to-digital conversion chip U14, a terminal H8, a terminal H14, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a resistor R33, and a resistor R34;

[0012] One end of the capacitor C31 is connected to capacitor C32, pin 13 of the analog-to-digital conversion chip U14, pin 14 of the analog-to-digital conversion chip U14, and positive 5V, and the other end is connected to the ground; one end of the capacitor C30 is connected to pin 7 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R33, and the other end is connected to the ground; one end of the capacitor C34 is connected to pin 8 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R34, and the other end is connected to the ground.

[0013] Preferably, the communication module includes a USB-CAN bus conversion module, a UART module, an SPI communication interface and an RS485 module;

[0014] The USB-CAN bus conversion module includes a CAN chip U4, a wiring terminal U5, a wiring terminal H2, a USB connector USB1, a diode D4, a resistor R2, a resistor R10, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a capacitor C4;

[0015] Pin 1 of the CAN chip U4 is connected to pin 1 of the wiring terminal H2, pin 4 of the CAN chip U4 is connected to pin 2 of the wiring terminal H2, and pin 8 of the CAN chip U4 is connected to ground;

[0016] After the resistor R2 is connected in parallel with the wiring terminal U5, one end is connected to pin 7 of the CAN chip U4, and the other end is connected to pin 6 of the CAN chip U4; one end of the resistor R10 is connected to pin B5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R12 is connected to pin B6 and pin A6 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R14 is connected to pin A5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R13 is connected to pin 6 of the wiring terminal H2, and the other end is connected to pin A7 and pin B7 of the USB connector USB1; one end of the resistor R15 is connected to pin 5 of the wiring terminal H2, and the other end is connected to pin B6 and pin A6 of the USB connector USB1;

[0017] One end of the capacitor C4 is connected to +5V and pin 3 of the CAN chip U4, and the other end is connected to pin 2 of the CAN chip U4 and ground;

[0018] One end of the diode D4 is connected to pins A4 and A9 of the USB connector USB1, and the other end is connected to a +5V voltage.

[0019] Preferably, the UART module includes a connection terminal H9; pin 1 of the connection terminal H9 is connected to VCC, pins 2 and 3 of the connection terminal H9 are connected to the microcontroller, and pin 4 of the connection terminal H9 is connected to the ground.

[0020] Preferably, the RS485 module includes an RS485 chip U7, a wiring terminal U8, a resistor R4, a resistor R6, a resistor R8, and a capacitor C4;

[0021] Pin 1 and pin 4 of the RS485 chip U7 are connected to the microcontroller, and pin 2 of the RS485 chip U7 is connected to pin 3 of the RS485 chip U7 and the microcontroller;

[0022] One end of the resistor R4 is connected to the capacitor C5 and the ground, and the other end is connected to the pin 7 of the RS485 chip U7, the resistor R8 and the pin 2 of the wiring terminal U8; one end of the resistor R6 is connected to the pin 8 of the RS485 chip U7 and VCC, and the other end is connected to the pin 6 of the RS485 chip U7, the resistor R8 and the pin 1 of the wiring terminal U8;

[0023] Preferably, the SPI communication interface includes a connection terminal H11; pin 1 of the connection terminal H11 is connected to VCC, pin 2, pin 3, and pin 4 of the connection terminal H11 are connected to the microcontroller, and pin 5 of the connection terminal H11 is connected to ground.

[0024] Preferably, the display module comprises a wiring terminal H16; pin 1 of the wiring terminal H16 is connected to the ground, pins 2 and 3 of the wiring terminal H16 are connected to the microcontroller, and pin 5 of the wiring terminal H16 is connected to +5V.

[0025] Preferably, the D / A converter is used to realize the conversion from digital quantity to analog quantity, which can be realized by the pulse width modulation (PWM) function of the MCU or by using an external D / A conversion chip.

[0026] Preferably, the microcontroller includes a single chip microcomputer U18, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, ​​a capacitor C47, a resistor R45, a resistor R46, a resistor R48, a resistor R50, a crystal oscillator X1, a terminal H17, and a switch SW2;

[0027] Pin 6 of the single-chip microcomputer U18 is connected to VCC, pin 11 of the single-chip microcomputer U18, pin 19 of the single-chip microcomputer U18, pin 28 of the single-chip microcomputer U18, pin 50 of the single-chip microcomputer U18, pin 75 of the single-chip microcomputer U18, and pin 100 of the single-chip microcomputer U18 are connected to ground, pin 25 and pin 26 of the single-chip microcomputer U18 are connected to the UART module of the communication module, pin 29 of the single-chip microcomputer U18 is connected to the voltage amplifier circuit, and the single-chip microcomputer Pin 30, pin 31, pin 32 of U18 are connected to the SPI communication interface of the communication module, pin 68, pin 69 of the single-chip computer U18 are connected to the display module, pin 70, pin 71 of the single-chip computer U18 are connected to the USB module of the communication module, pin 72, pin 76 of the single-chip computer U18 are connected to terminal H17, pin 46, pin 47, pin 48 of the single-chip computer U18 are connected to the RS485 module of the communication module, pin 51, pin 52, pin 53, pin 54 of the single-chip computer U18 are connected to the data acquisition module;

[0028] After the crystal oscillator X1 is connected in parallel with the resistor R50, one end is connected to the pin 12 of the microcontroller U18 and the capacitor C38, and the other end is connected to the pin 13 of the microcontroller U18 and the capacitor C47;

[0029] After the capacitor C39 is connected in parallel with the capacitors C40, C41, C42, C43 and C44, one end is connected to VCC and the other end is connected to the ground; one end of the capacitor C46 is connected to the pin 49 of the single-chip computer U18 and the other end is connected to the ground; one end of the capacitor C48 is connected to the pin 73 of the single-chip computer U18 and the other end is connected to the ground; after the capacitor C45 is connected in parallel with the switch SW2, one end is connected to the pin 14 of the single-chip computer U18 and the resistor R46 and the other end is connected to the ground; after the capacitor C35 is connected in parallel with the capacitor C36, one end is connected to the pin 20 of the single-chip computer U18 and the ground and the other end is connected to the pin 22 of the single-chip computer U18 and the resistor R45;

[0030] One end of the resistor R48 is connected to the pin 94 of the single chip computer U18, and the other end is connected to the ground.

[0031] The beneficial effects of the utility model are:

[0032] 1) In the present invention, a load sensor or external device is connected to a load converter by a connecting line. After the numerical value is processed internally by the load converter, a variety of different signals can be output as required. The measured data can also be directly displayed on the touch screen of the load converter, thereby improving the convenience and efficiency of the device.

[0033] 2) The load data converter of the utility model can also convert the load data transmitted to the load converter by the external device through the communication module into analog signals such as 0-20mV, 4-20mA and 0-5V through the D / A converter; it can realize the conversion of analog signal-analog signal and analog signal-digital signal, and at the same time, it can also convert the digital signal transmitted to the converter by the external device into analog signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a module schematic diagram of the load data converter of the utility model;

[0035] Figure 2 This is the functional block diagram of the load data converter of the utility model;

[0036] Figure 3 This is a voltage amplification circuit diagram of an embodiment of the utility model;

[0037] Figure 4 The V / I conversion circuit diagram of the embodiment of the utility model;

[0038] Figure 5 A circuit diagram of a data acquisition module according to an embodiment of the utility model;

[0039] Figure 6 This is a circuit diagram of a USB-CAN bus conversion module according to an embodiment of the utility model;

[0040] Figure 7 A circuit diagram of a UART module according to an embodiment of the present utility model;

[0041] Figure 8 The RS485 module circuit diagram of the utility model embodiment;

[0042] Fig. 9 A circuit diagram of a display module according to an embodiment of the utility model;

[0043] Fig.10 This is a circuit diagram of the SPI communication interface of an embodiment of the utility model;

[0044] Fig.11 This is a circuit diagram of a microcontroller according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] The load-strain relationship curve or stress-strain relationship curve is one of the most important indicators for expressing the mechanical properties of materials or structures. When conducting mechanical property tests on relevant specimens, it is often necessary to paste strain gauges on the specimens to obtain the load and strain data at the same time in real time during the loading process. The experimental process requires the use of electronic universal material testing machines and static strain gauges to collect the corresponding time-load data and time-strain data in the test respectively. Since the load data and strain data are collected by control systems of different manufacturers, different sampling rates of different collection systems, and asynchronous sampling times make it difficult to accurately obtain load-strain data, stress-strain correspondence and related data curves, which brings difficulties to related research and analysis.

[0047] At present, the most commonly used method is to export stress and strain data from different acquisition systems and find corresponding points through the trend of data changes, but this introduces human errors into the analysis and calculation results. Therefore, a new load converter that can reduce human errors is very necessary.

[0048] To this end, the utility model proposes a multifunctional load data converter for a strain gauge load sensor, such as Figure 1 As shown, it includes a signal conditioning module, a data acquisition module, a microcontroller, a communication module, a D / A converter and a display module; the signal conditioning module, the data acquisition module, the communication module, the D / A converter and the display module are respectively connected to the microcontroller; the data acquisition module collects the sensor signal conditioned by the signal conditioning module and converts the signal into a digital signal, the microcontroller is used for reading and processing the A / D conversion data, and controls the working states of the signal conditioning module, the data acquisition module, the communication module, the D / A converter and the display module, and sends the collected data to the communication module; the display module adopts a display touch screen for displaying load data and parameter settings.

[0049] In the utility model, the load detection sensor or external device is connected to the load converter by a connecting line. After the value is processed internally by the load converter, a variety of different signals can be output as required. The measured data can also be directly displayed on the display touch screen of the load converter, thereby improving the convenience and efficiency of the device. Figure 2 As shown, the load data converter of the utility model can also convert the load data transmitted to the load converter by the external device through the communication module into analog signals such as 0-20mV, 4-20mA and 0-5V through the D / A converter; it can realize the conversion of analog signal-analog signal and analog signal-digital signal, and at the same time, it can also convert the digital signal transmitted to the converter by the external device into analog signal.

[0050] Further, the signal conditioning module includes a voltage amplification circuit and a V / I conversion circuit;

[0051] Among them, Figure 3 As shown, the voltage amplifier circuit includes an operational amplifier chip U12, a capacitor C23, a capacitor C29, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a wiring terminal H10, a wiring terminal H12, and a voltage regulator diode D5;

[0052] After the capacitor C23 is connected in parallel with the resistor R25, one end is connected to the wiring terminal H12 and the resistor R23, and the other end is connected to the ground; after the capacitor C29 is connected in parallel with the resistor R30, one end is connected to the resistor R29 and the pin 2 of the operational amplifier chip, and the other end is connected to the resistor R31;

[0053] One end of the resistor R23 is connected to the resistor R25, the terminal H12, and the capacitor C23, and the other end is connected to the pin 3 of the operational amplifier chip; one end of the resistor R28 is connected to the resistor R29, and the other end is connected to the ground; one end of the resistor R24 ​​is connected to the resistor R31 and the pin 1 of the operational amplifier chip, and the other end is connected to the voltage regulator diode D5 and the pin 5 of the operational amplifier chip; one end of the resistor R26 is connected to the pins 6 and 7 of the operational amplifier chip, and the other end is connected to the V / I conversion circuit.

[0054] Further, such as Figure 4 As shown, the V / I conversion circuit includes a resistor R35, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a wiring terminal H15, an operational amplifier chip U15, a differential operational amplifier chip U16, and a transistor U17;

[0055] One end of the resistor R35 is connected to the resistor R36 and the resistor R37, and the other end is connected to the voltage amplifier circuit; one end of the resistor R37 is connected to the pin 2 of the operational amplifier chip U15, the resistor R35 and the resistor R36, and the other end is connected to the 5V reference voltage; one end of the resistor R38 is connected to the pin 7 and the positive 15 voltage of the differential operational amplifier chip U16, and the other end is connected to the transistor U17; one end of the resistor R39 is connected to the pin 5 of the differential operational amplifier chip U16, and the other end is connected to the resistor R40; one end of the resistor R41 is connected to the resistor R40, and the other end is connected to the transistor U17 and the resistor R42; one end of the resistor R42 is connected to the resistor R43, and the other end is connected to the transistor U17 and the resistor R41; one end of the resistor R44 is connected to the resistor R43, and the other end is connected to the pin 1 of the differential operational amplifier chip U16 and a terminal H15.

[0056] Further, such as Figure 5 As shown, the data acquisition module includes an analog-to-digital conversion chip U14, a terminal H8, a terminal H14, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a resistor R33, and a resistor R34;

[0057] One end of the capacitor C31 is connected to capacitor C32, pin 13 of the analog-to-digital conversion chip U14, pin 14 of the analog-to-digital conversion chip U14, and positive 5V, and the other end is connected to the ground; one end of the capacitor C30 is connected to pin 7 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R33, and the other end is connected to the ground; one end of the capacitor C34 is connected to pin 8 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R34, and the other end is connected to the ground.

[0058] Furthermore, the communication module includes a USB-CAN bus conversion module, a UART module, an SPI communication interface and an RS485 module;

[0059] Further, such as Figure 6 As shown, the USB-CAN bus conversion module includes a CAN chip U4, a wiring terminal U5, a wiring terminal H2, a USB connector USB1, a diode D4, a resistor R2, a resistor R10, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a capacitor C4;

[0060] Pin 1 of the CAN chip U4 is connected to pin 1 of the wiring terminal H2, pin 4 of the CAN chip U4 is connected to pin 2 of the wiring terminal H2, and pin 8 of the CAN chip U4 is connected to ground;

[0061] After the resistor R2 is connected in parallel with the wiring terminal U5, one end is connected to pin 7 of the CAN chip U4, and the other end is connected to pin 6 of the CAN chip U4; one end of the resistor R10 is connected to pin B5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R12 is connected to pin B6 and pin A6 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R14 is connected to pin A5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R13 is connected to pin 6 of the wiring terminal H2, and the other end is connected to pin A7 and pin B7 of the USB connector USB1; one end of the resistor R15 is connected to pin 5 of the wiring terminal H2, and the other end is connected to pin B6 and pin A6 of the USB connector USB1;

[0062] One end of the capacitor C4 is connected to +5V and pin 3 of the CAN chip U4, and the other end is connected to pin 2 of the CAN chip U4 and ground;

[0063] One end of the diode D4 is connected to pins A4 and A9 of the USB connector USB1, and the other end is connected to a +5V voltage.

[0064] Further, such as Figure 7 As shown, the UART module includes a connection terminal H9; pin 1 of the connection terminal H9 is connected to VCC, pins 2 and 3 of the connection terminal H9 are connected to the microcontroller, and pin 4 of the connection terminal H9 is connected to the ground.

[0065] Further, such as Figure 8 As shown, the RS485 module includes an RS485 chip U7, a wiring terminal U8, a resistor R4, a resistor R6, a resistor R8, and a capacitor C4;

[0066] Pin 1 and pin 4 of the RS485 chip U7 are connected to the microcontroller, and pin 2 of the RS485 chip U7 is connected to pin 3 of the RS485 chip U7 and the microcontroller;

[0067] One end of the resistor R4 is connected to the capacitor C5 and the ground, and the other end is connected to the pin 7 of the RS485 chip U7, the resistor R8 and the pin 2 of the terminal U8; one end of the resistor R6 is connected to the pin 8 of the RS485 chip U7 and VCC, and the other end is connected to the pin 6 of the RS485 chip U7, the resistor R8 and the pin 1 of the terminal U8.

[0068] Further, such as Fig. 9 As shown, the display module includes a terminal H16; pin 1 of the terminal H16 is connected to the ground, pins 2 and 3 of the terminal H16 are connected to the microcontroller, and pin 5 of the terminal H16 is connected to +5V.

[0069] Further, such as Fig.10 As shown, the SPI communication interface includes a connection terminal H11; pin 1 of the connection terminal H11 is connected to VCC, pins 2, 3, and 4 of the connection terminal H11 are connected to the microcontroller, and pin 5 of the connection terminal H11 is connected to ground.

[0070] The D / A converter is used to realize the conversion from digital quantity to analog quantity, which is realized by the pulse width modulation function of MCU or by an external D / A conversion chip.

[0071] Furthermore, the D / A converter adopts the pulse width modulation function of the MCU.

[0072] Further, such as Fig.11 As shown, the microcontroller includes a single chip computer U18, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, ​​a capacitor C47, a resistor R45, a resistor R46, a resistor R48, a resistor R50, a crystal oscillator X1, a terminal H17, and a switch SW2;

[0073] Pin 6 of the single-chip microcomputer U18 is connected to VCC, pin 11 of the single-chip microcomputer U18, pin 19 of the single-chip microcomputer U18, pin 28 of the single-chip microcomputer U18, pin 50 of the single-chip microcomputer U18, pin 75 of the single-chip microcomputer U18, and pin 100 of the single-chip microcomputer U18 are connected to ground, pin 25 and pin 26 of the single-chip microcomputer U18 are connected to the UART module of the communication module, pin 29 of the single-chip microcomputer U18 is connected to the voltage amplifier circuit, and the single-chip microcomputer Pin 30, pin 31, pin 32 of U18 are connected to the SPI communication interface of the communication module, pin 68, pin 69 of the single-chip computer U18 are connected to the display module, pin 70, pin 71 of the single-chip computer U18 are connected to the USB module of the communication module, pin 72, pin 76 of the single-chip computer U18 are connected to terminal H17, pin 46, pin 47, pin 48 of the single-chip computer U18 are connected to the RS485 module of the communication module, pin 51, pin 52, pin 53, pin 54 of the single-chip computer U18 are connected to the data acquisition module;

[0074] After the crystal oscillator X1 is connected in parallel with the resistor R50, one end is connected to the pin 12 of the microcontroller U18 and the capacitor C38, and the other end is connected to the pin 13 of the microcontroller U18 and the capacitor C47;

[0075] After the capacitor C39 is connected in parallel with the capacitors C40, C41, C42, C43 and C44, one end is connected to VCC and the other end is connected to the ground; one end of the capacitor C46 is connected to the pin 49 of the single-chip computer U18 and the other end is connected to the ground; one end of the capacitor C48 is connected to the pin 73 of the single-chip computer U18 and the other end is connected to the ground; after the capacitor C45 is connected in parallel with the switch SW2, one end is connected to the pin 14 of the single-chip computer U18 and the resistor R46 and the other end is connected to the ground; after the capacitor C35 is connected in parallel with the capacitor C36, one end is connected to the pin 20 of the single-chip computer U18 and the ground and the other end is connected to the pin 22 of the single-chip computer U18 and the resistor R45;

[0076] One end of the resistor R48 is connected to the pin 94 of the single chip computer U18, and the other end is connected to the ground.

[0077] When the load converter described in the utility model is connected to the sensor of the universal material testing machine, the sensor signal is amplified, and then connected to instruments such as resistance strain gauges, the corresponding loading load of the universal material testing machine can be obtained while measuring the strain, ensuring that the load data collected by the resistance strain gauge is synchronized with the strain data and has the same sampling rate, and finally achieving a one-to-one correspondence between the load data and the strain data. It can also be connected to the host computer through a USB interface, and digital signals are transmitted through the USB interface. The host computer reads the data transmitted by the USB interface through software and integrates it into the strain acquisition system to maintain data consistency.

[0078] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A multifunctional load data converter for a strain gauge load sensor, characterized in that: include: Signal conditioning module, data acquisition module, microcontroller, communication module, D / A converter and display module; the signal conditioning module, data acquisition module, communication module, D / A converter and display module are respectively connected to the microcontroller; the data acquisition module collects sensor signals conditioned by the signal conditioning module and converts the signals into digital signals, the microcontroller is used for reading and processing A / D conversion data, and controls the working states of the signal conditioning module, data acquisition module, communication module, D / A converter and display module, and sends the collected data to the communication module; the display module adopts a display touch screen for displaying load data and parameter settings.

2. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The signal conditioning module includes a voltage amplification circuit and a V / I conversion circuit; The voltage amplifier circuit includes an operational amplifier chip U12, a capacitor C23, a capacitor C29, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a terminal H10, a terminal H12, and a voltage regulator diode D5; After the capacitor C23 is connected in parallel with the resistor R25, one end is connected to the wiring terminal H12 and the resistor R23, and the other end is connected to the ground; after the capacitor C29 is connected in parallel with the resistor R30, one end is connected to the resistor R29 and the pin 2 of the operational amplifier chip, and the other end is connected to the resistor R31; One end of the resistor R23 is connected to the resistor R25, the terminal H12, and the capacitor C23, and the other end is connected to the pin 3 of the operational amplifier chip; one end of the resistor R28 is connected to the resistor R29, and the other end is connected to the ground; one end of the resistor R24 ​​is connected to the resistor R31 and the pin 1 of the operational amplifier chip, and the other end is connected to the voltage regulator diode D5 and the pin 5 of the operational amplifier chip; one end of the resistor R26 is connected to the pins 6 and 7 of the operational amplifier chip, and the other end is connected to the V / I conversion circuit.

3. The multifunctional load data converter for a strain gauge load sensor according to claim 2, characterized in that: The V / I conversion circuit includes a resistor R35, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a wiring terminal H15, an operational amplifier chip U15, a differential operational amplifier chip U16, and a transistor U17; One end of the resistor R35 is connected to the resistor R36 and the resistor R37, and the other end is connected to the voltage amplifier circuit; one end of the resistor R37 is connected to the pin 2 of the operational amplifier chip U15, the resistor R35 and the resistor R36, and the other end is connected to the 5V reference voltage; one end of the resistor R38 is connected to the pin 7 and the positive 15 voltage of the differential operational amplifier chip U16, and the other end is connected to the transistor U17; one end of the resistor R39 is connected to the pin 5 of the differential operational amplifier chip U16, and the other end is connected to the resistor R40; one end of the resistor R41 is connected to the resistor R40, and the other end is connected to the transistor U17 and the resistor R42; one end of the resistor R42 is connected to the resistor R43, and the other end is connected to the transistor U17 and the resistor R41; one end of the resistor R44 is connected to the resistor R43, and the other end is connected to the pin 1 of the differential operational amplifier chip U16 and a terminal H15.

4. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The data acquisition module includes an analog-to-digital conversion chip U14, a terminal H8, a terminal H14, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a resistor R33, and a resistor R34; One end of the capacitor C31 is connected to capacitor C32, pin 13 of the analog-to-digital conversion chip U14, pin 14 of the analog-to-digital conversion chip U14, and positive 5V, and the other end is connected to the ground; one end of the capacitor C30 is connected to pin 7 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R33, and the other end is connected to the ground; one end of the capacitor C34 is connected to pin 8 of the analog-to-digital conversion chip U14, capacitor C33, and resistor R34, and the other end is connected to the ground.

5. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The communication module includes a USB-CAN bus conversion module, a UART module, an SPI communication interface and an RS485 module; The USB-CAN bus conversion module includes a CAN chip U4, a wiring terminal U5, a wiring terminal H2, a USB connector USB1, a diode D4, a resistor R2, a resistor R10, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a capacitor C4; Pin 1 of the CAN chip U4 is connected to pin 1 of the wiring terminal H2, pin 4 of the CAN chip U4 is connected to pin 2 of the wiring terminal H2, and pin 8 of the CAN chip U4 is connected to ground; After the resistor R2 is connected in parallel with the wiring terminal U5, one end is connected to pin 7 of the CAN chip U4, and the other end is connected to pin 6 of the CAN chip U4; one end of the resistor R10 is connected to pin B5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R12 is connected to pin B6 and pin A6 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R14 is connected to pin A5 of the USB connector USB1, and the other end is connected to the ground; one end of the resistor R13 is connected to pin 6 of the wiring terminal H2, and the other end is connected to pin A7 and pin B7 of the USB connector USB1; one end of the resistor R15 is connected to pin 5 of the wiring terminal H2, and the other end is connected to pin B6 and pin A6 of the USB connector USB1; One end of the capacitor C4 is connected to +5V and pin 3 of the CAN chip U4, and the other end is connected to pin 2 of the CAN chip U4 and ground; One end of the diode D4 is connected to pins A4 and A9 of the USB connector USB1, and the other end is connected to a +5V voltage.

6. The multifunctional load data converter for a strain gauge load sensor according to claim 5, characterized in that: The UART module includes a connection terminal H9; pin 1 of the connection terminal H9 is connected to VCC, pins 2 and 3 of the connection terminal H9 are connected to the microcontroller, and pin 4 of the connection terminal H9 is connected to the ground.

7. The multifunctional load data converter for a strain gauge load sensor according to claim 5, characterized in that: The RS485 module includes an RS485 chip U7, a wiring terminal U8, a resistor R4, a resistor R6, a resistor R8, and a capacitor C4; Pin 1 and pin 4 of the RS485 chip U7 are connected to the microcontroller, and pin 2 of the RS485 chip U7 is connected to pin 3 of the RS485 chip U7 and the microcontroller; One end of the resistor R4 is connected to the capacitor C5 and the ground, and the other end is connected to the pin 7 of the RS485 chip U7, the resistor R8 and the pin 2 of the wiring terminal U8; one end of the resistor R6 is connected to the pin 8 of the RS485 chip U7 and VCC, and the other end is connected to the pin 6 of the RS485 chip U7, the resistor R8 and the pin 1 of the wiring terminal U8; The SPI communication interface includes a connection terminal H11; pin 1 of the connection terminal H11 is connected to VCC, pins 2, 3 and 4 of the connection terminal H11 are connected to the microcontroller, and pin 5 of the connection terminal H11 is connected to the ground.

8. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The display module includes a wiring terminal H16; pin 1 of the wiring terminal H16 is connected to the ground, pins 2 and 3 of the wiring terminal H16 are connected to the microcontroller, and pin 5 of the wiring terminal H16 is connected to +5V.

9. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The D / A converter is used to realize the conversion from digital quantity to analog quantity, which is realized by the pulse width modulation function of MCU or by an external D / A conversion chip.

10. The multifunctional load data converter for a strain gauge load sensor according to claim 1, characterized in that: The microcontroller includes a single chip microcomputer U18, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, ​​a capacitor C47, a resistor R45, a resistor R46, a resistor R48, a resistor R50, a crystal oscillator X1, a terminal H17, and a switch SW2; Pin 6 of the single-chip microcomputer U18 is connected to VCC, pin 11 of the single-chip microcomputer U18, pin 19 of the single-chip microcomputer U18, pin 28 of the single-chip microcomputer U18, pin 50 of the single-chip microcomputer U18, pin 75 of the single-chip microcomputer U18, and pin 100 of the single-chip microcomputer U18 are connected to ground, pin 25 and pin 26 of the single-chip microcomputer U18 are connected to the UART module of the communication module, pin 29 of the single-chip microcomputer U18 is connected to the voltage amplifier circuit, and the single-chip microcomputer Pin 30, pin 31, pin 32 of U18 are connected to the SPI communication interface of the communication module, pin 68, pin 69 of the single-chip computer U18 are connected to the display module, pin 70, pin 71 of the single-chip computer U18 are connected to the USB module of the communication module, pin 72, pin 76 of the single-chip computer U18 are connected to terminal H17, pin 46, pin 47, pin 48 of the single-chip computer U18 are connected to the RS485 module of the communication module, pin 51, pin 52, pin 53, pin 54 of the single-chip computer U18 are connected to the data acquisition module; After the crystal oscillator X1 is connected in parallel with the resistor R50, one end is connected to the pin 12 of the microcontroller U18 and the capacitor C38, and the other end is connected to the pin 13 of the microcontroller U18 and the capacitor C47; After the capacitor C39 is connected in parallel with the capacitors C40, C41, C42, C43 and C44, one end is connected to VCC and the other end is connected to the ground; one end of the capacitor C46 is connected to the pin 49 of the single-chip computer U18 and the other end is connected to the ground; one end of the capacitor C48 is connected to the pin 73 of the single-chip computer U18 and the other end is connected to the ground; after the capacitor C45 is connected in parallel with the switch SW2, one end is connected to the pin 14 of the single-chip computer U18 and the resistor R46 and the other end is connected to the ground; after the capacitor C35 is connected in parallel with the capacitor C36, one end is connected to the pin 20 of the single-chip computer U18 and the ground and the other end is connected to the pin 22 of the single-chip computer U18 and the resistor R45; One end of the resistor R48 is connected to the pin 94 of the single chip computer U18, and the other end is connected to the ground.

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