CN104729642B - A kind of track scale metering system based on CAN - Google Patents
A kind of track scale metering system based on CAN Download PDFInfo
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Abstract
The invention provides a kind of track scale metering system based on CAN, it mainly comprises sensor circuit, signal amplification circuit, A/D change-over circuit, CAN interface circuit, CAN and host computer.Described signal amplification circuit is the two-stage differential amplifying circuit be made up of two operational amplifiers, and external dc power is through voltage stabilizing and filtering process backward amplify circuit with power.CAN interface circuit comprises CAN controller, optical coupler and CAN transceiver, is undertaken communicating to realize electrical isolation between CAN controller with CAN transceiver by optical coupler.CAN controller is configured to the function with control system switching signal and failure alarm signal.
Description
Technical field
The present invention relates to weighing technology field, particularly relate to a kind of track scale metering system based on CAN.
Background technology
Track scale is mounted on railway the equipment that train lade weight is measured.Track scale is made up of utility appliance such as bearing platform, sensor, weight display and digital printers usually, automatically can show numerical value of weighing, and has the features such as teletransmission information, continuous measurement.Due to these features, current track weighing apparatus technology has extensively been applied to factory, mine, metallurgy, foreign trade and railway interests weighing to lorry bulkload.
At present, the sensor that common track scale adopts is analog signal sensors, and generally each sensor has a signal wire to walk tens meters of penetration pipes access master controllers, need more emat sensor time more difficult, and simulating signal is easily disturbed, be not easy to long range propagation.The digital signal track scale of serial line interface transmission is adopted to there is the slower problem of sampling rate.
Controller local area network (ControllerAreaNetwork, CAN) be by German BOSCH company developed in 1986 towards automobile and the serial communication protocol of final ISO International standardization., it has become one of fieldbus be most widely used in the world at present.
The serial communication network that CAN is a kind of effective support distributed AC servo system or controls in real time.The dcs built based on R line with current many RS-485, the dcs based on CAN has the obvious superiority of following aspect: the data communication between each node of (1) network is real-time; (2) there is perfect communication protocol to be realized by CAN controller chip and interface chip thereof, thus greatly reduce system development difficulty, effectively can shorten the construction cycle; (3) high, the easy realization of traffic rate and cost performance is high.Data communication due to CAN has superperformance and the unique design such as outstanding reliability, real-time and dirigibility, and CAN is more and more subject to people's attention.
Except initial application on automotive field, CAN has been widely used in industrial automation, various control equipment, the vehicles, Medical Instruments and numerous department such as building, environmental Kuznets Curves at present.Controller area network more obtains comparatively universal popularization at home.In track scale field, some application about CAN in prior art, are also there are.Such as, in No. 201020532762.3 Chinese utility model patents, a kind of dynamic railway truck scale weighing instruments based on CAN is just proposed; Xu is along it is also proposed a kind of track scale metering system based on CAN clearly.The proposition of these schemes, solves track scale for a long time and executes the problem that a lot of root tens rice noodles cable is worn in man-hour requirement, change, to keep in repair sensor also convenient.
But, it is perfect not to there is overall system design in the track scale metering system of CAN of the prior art, insufficiency, existing capability circuit structure design is optimized not, and such as amplification circuit structure is optimized not, common-mode rejection ratio is not enough, to problems such as the adaptive faculty of sensor are not good.
Summary of the invention
For solving the problem, the invention provides a kind of track scale metering system based on CAN of novelty, wherein by being optimized the design of each functional circuit, improve the adaptability to sensor circuit, improving the accuracy of DATA REASONING, the navigability of system and anti-interference etc.
According to the track scale metering system based on CAN of the present invention, it mainly comprises sensor circuit, signal amplification circuit, A/D change-over circuit, CAN interface circuit, CAN and host computer.Wherein, resistance strain-gauge transducer is adopted in described sensor circuit.Described signal amplification circuit is the two-stage differential amplifying circuit comprising two operational amplifier U1 and U2, and external dc power is powered through voltage stabilizing and the backward described signal amplification circuit of filtering process.Described CAN interface circuit comprises CAN controller, optical coupler and CAN transceiver, described CAN controller is communicated by optical coupler with between CAN transceiver, and described CAN controller is arranged for the switching signal and the failure alarm signal that control described track scale metering system.
Described sensor circuit comprises strain full-bridge circuit, to improve measurement sensistivity.
Described signal amplification circuit comprises first order amplifying circuit and second level amplifying circuit.In first order amplifying circuit, signal input part IN+, IN-access pin 2 and the pin 3 of operational amplifier U1 respectively through resistance R1 and R2, form Differential Input, synchronous signal input end IN+ is also electrically connected with electric capacity C2, the parallel circuit of signal input part IN-also contact resistance R3 and electric capacity C1, the other end of electric capacity C1, C2 and resistance R3 is electrically connected, and can carry out filtering by shunt capacitance C1 and C2 to input signal.The pin 1 of operational amplifier U1 to be formed with pin 8 through resistance R7 and is electrically connected.The pin 4 of operational amplifier U1 is electrically connected with ground GND.The pin 5 of operational amplifier U1 is connected to ground GND through resistance R5.The pin 6 of operational amplifier U1 is electrically connected with the pin 2 of operational amplifier U1 through the parallel circuit of resistance R17, resistance R4 and electric capacity C3 and resistance R1, forms Voltage Feedback amplifying return circuit.The pin 7 of operational amplifier U1 to be formed with power Vcc through resistance R8 and is electrically connected.Power Vcc is connected to ground GND by the parallel circuit of electric capacity C4 and electric capacity C5 and resistance R6, and the output signal for power Vcc provides voltage stabilizing process.The simulating signal of Differential Input exports first order amplifying signal through pin 6 after operational amplifier U1 amplifies.Second level amplifying circuit comprises operational amplifier U2, and the pin 6 of operational amplifier U1 is electrically connected to the pin 3 of operational amplifier U2 through resistance R11, is introduced in the amplifying circuit of the second level by first order amplifying signal.The pin 2 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R9 through resistance R10, the pin 3 of variable resistor R9 is electrically connected with power Vcc, and pin 2 is formed with ground GND and is electrically connected.The pin 1 of operational amplifier U2 is electrically connected with the pin 3 of variable resistor R14 through resistance R12, and the pin 8 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R14.The pin 7 of operational amplifier U2 is electrically connected with power Vcc through resistance R13.The pin 4 of operational amplifier U2 is electrically connected to ground GND through electric capacity C6, is electrically connected again through resistance R16 with power supply-Vcc simultaneously.The pin 5 of operational amplifier U2 is jointly formed with ground GND with first order amplifying circuit and is electrically connected.The pin 6 of operational amplifier U2 through resistance R15 connection signal output terminal OUT, simultaneously through electric capacity C7 electric connection of power supply-Vcc.Output terminal OUT is formed through electric capacity C8 be electrically connected with ground GND.Wherein, pin 1 and the resistance R10 of operational amplifier U2 form bleeder circuit, by regulating the resistance of variable resistor R9, can change the dividing potential drop resistance of resistance R10, realize the regulatory function of amplifying voltage.Because pin 2 is positive input, the input can introducing forward voltage and pin 3 by this pin 2 thus forms Differential Input, then can provide zeroing function by regulating this forward input voltage, eliminating because the output that causes of electric bridge imbalance is on the impact of input.
Described A/D change-over circuit adopts 24 ∑-△ type A/D converter AD7734, wherein, and the pin AIN1 connection signal input end IN of AD7734; Pin MCLKIN with MCLKOUT is connected the two ends of crystal oscillator X respectively, and the two ends of crystal oscillator X are electrically connected with ground GND through electric capacity Cad2 and Cad3 respectively simultaneously; Pin REFIN (+) is electrically connected with ground GND through electric capacity Cad1, connects the pin 3 of variable resistor Rad1 simultaneously; Pin REFIN (-) is electrically connected with ground GND, and be electrically connected the pin 2 of variable resistor Rad1, the pin 1 of variable resistor Rad1 is electrically connected with the pin AIN4 of converter simultaneously; Pin DVdd is connected to+5V direct supply, is electrically connected through electric capacity Cad4 with ground GND simultaneously; Pin DGND is electrically connected with ground GND, is electrically connected through electric capacity Cad5 with pin DVdd simultaneously; Pin AVdd connects+5V AC power, is electrically connected through electric capacity Cad6 with ground GND simultaneously; Pin AGND is electrically connected with ground GND, is electrically connected through electric capacity Cad7 with pin AVdd simultaneously; Pin DOUT connection signal output terminal OUT, exports the digital signal through conversion.
Described CAN controller is PIC18F258CAN bus controller, and described bus transceiver is MCP2551CAN bus transceiver; Digital signal is sent to the SDI port of described bus controller, the CANTX port of described bus controller is connected with the TXD port of described bus transceiver through described photoelectrical coupler, CANRX port is connected with the RXD port of described bus transceiver through photoelectrical coupler, port CANH, CANL of described bus transceiver are connected with CAN through resistance respectively, described port CANH, CANL are also connected with ground GND through electric capacity respectively, and the port RS of described bus transceiver is electrically connected with ground GND through 120 Ohmages.
In described CAN controller, its RC3 port can also be arranged for the switching signal controlling metering system.Further, the port INT0 of described bus controller can also be arranged for the fault-signal receiving metering system.
Accompanying drawing explanation
Fig. 1 shows the General Principle figure according to the track scale metering system based on CAN of the present invention;
Fig. 2 shows according to the schematic diagram based on signal amplification circuit in the track scale metering system of CAN of the present invention;
Fig. 3 shows according to the schematic diagram based on A/D change-over circuit in the track scale metering system of CAN of the present invention.
Embodiment
Fig. 1 shows the general formation of the track scale metering system based on CAN.Whole metering system is formed primarily of sensor circuit, signal amplification circuit, A/D change-over circuit, CAN interface circuit, CAN and host computer.Wherein adopt resistance strain-gauge transducer in sensor circuit, comprise sensor circuit, signal amplification circuit, A/D change-over circuit metering units by CAN interface circuit access CAN, and then communicate with host computer, thus form a CAN fieldbus networks system, realize the object of on-line measurement, ensure that accuracy, reliability and transmission speed that data are transmitted simultaneously.
Workflow based on the track scale metering system of CAN is roughly as follows: when weighting objects (being generally the train be loaded with wait thing of borrowing money) arrives weighing table, the resistance strain-gauge transducer be positioned at below table top produces deformation because of the effect of being under pressure, and then the resistance size changing into foil gauge changes, sensor circuit exports corresponding simulating signal and sends to signal amplification circuit, simulating signal is amplified by amplifying circuit, it is made to be suitable for carrying out analog to digital conversion, then by through amplify analog signal output in A/D converter, the digital signal of carrying out data transmission by CAN is converted to by A/D change-over circuit, digital signal through A/D conversion is sent to CAN through CAN interface circuit and transmits, last CAN signal is converted into RS232 signal and delivers to host computer (such as PC) and carry out further data processing or display.
In order to accurately reflect the weight of railway carriage, bridge circuit is adopted to obtain the output signal of resistance strain-gauge transducer.The signal that strain gauge transducer exports is generally difference mode signal and its primary output signal is comparatively faint, and wherein often containing larger common-mode signal, and this common-mode signal may be far longer than effective difference mode signal in signal intensity.Therefore, in track scale metering system of the present invention, a kind of signal amplification circuit is devised, it can while accurate amplifying signal, high gain and common-mode rejection ratio are provided, and ensure that there is lower drift and noise, and the adaptive faculty of sensor circuit is improved.
Fig. 2 shows the schematic diagram according to signal amplification circuit of the present invention.As shown in the figure, this signal amplification circuit comprises the two-stage signal amplifying circuit of two operational amplifier U1 and U2.
In the first order amplifying circuit comprising operational amplifier U1, signal input part IN+, IN-access pin 2 and the pin 3 of operational amplifier U1 respectively through resistance R1 and R2, form Differential Input.Signal input part IN+ is also electrically connected with electric capacity C2, and the parallel circuit of signal input part IN-also contact resistance R3 and electric capacity C1, the other end of electric capacity C1, C2 and resistance R3 is electrically connected, and wherein electric capacity C1 and C2 can provide filter action to input signal.The pin 1 of operational amplifier U1 is formed with pin 8 by resistance R7 and is electrically connected.The pin 4 of operational amplifier U1 is formed with ground GND and is electrically connected.The pin 5 of operational amplifier U1 to be formed with ground GND through resistance R5 and is electrically connected.The pin 6 of operational amplifier U1 to be formed with the pin 1 of operational amplifier U1 through the parallel circuit of resistance R17, resistance R4 and electric capacity C3 and resistance R1 and is electrically connected, thus forms a Voltage Feedback amplifying return circuit.The pin 7 of operational amplifier U1 to be formed with power Vcc through resistance R8 and is electrically connected.Power Vcc by electric capacity C4 be connected with the parallel circuit of electric capacity C5 and resistance R6 GND, thus provide voltage stabilizing process for power output signal.The simulating signal of Differential Input exports first order amplifying signal through pin 6 after operational amplifier U1 amplifies.
Second level amplifying circuit comprises operational amplifier U2, the pin 6(output terminal of operational amplifier U1) to be formed with the pin 3 of operational amplifier U2 through resistance R11 and be electrically connected, first order amplifying signal is introduced in the amplifying circuit of the second level.The pin 2 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R9 through resistance R10, the pin 3 of variable resistor R9 is electrically connected with power Vcc, and pin 2 is formed with ground GND and is electrically connected.The pin 1 of operational amplifier U2 is electrically connected with the pin 3 of variable resistor R14 through resistance R12, and the pin 8 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R14.The pin 7 of operational amplifier U2 is electrically connected with power Vcc through resistance R13.The pin 4 of operational amplifier U2 is electrically connected to ground GND through electric capacity C6, is electrically connected again through resistance R16 with power supply-Vcc simultaneously.The pin 5 of operational amplifier U2 is jointly formed with ground GND with first order amplifying circuit and is electrically connected.The pin 6 of operational amplifier U2 through resistance R15 connection signal output terminal OUT, simultaneously through electric capacity C7 electric connection of power supply-Vcc.Output terminal OUT is formed through electric capacity C8 be electrically connected with ground GND.Pin 1 and resistance R10 form bleeder circuit, by regulating the resistance of variable resistor R9, can change the dividing potential drop resistance of resistance R10, realize the regulatory function of amplifying voltage.Pin 2 is positive input, Differential Input is formed by the introducing of forward voltage and pin 3, by regulating forward input voltage to provide zeroing function, the output that electric bridge imbalance causes being regulated, eliminating the impact of this imbalance output on input.Second level amplifying circuit can realize the characteristics such as adjustable gain, input resistance that high common mode inhibition is when high, by the design of adjustable differential input, achieve the adjustment to input deviation under the uneven condition of electric bridge, thus accurate, stable output signal can be provided for follow-up signal process (such as analog to digital conversion).
In addition, external dc power voltage supply can be adopted, after voltage stabilizing and filtering process, be supplied to operational amplifier U1 and U2, thus stable operating voltage and electric current are provided.
Track scale metering system of the present invention adopts 24 ∑-△ type A/D converter AD7734 of ANALOG company in analog to digital conversion circuit.As shown in Figure 3, in this analog to digital conversion circuit, the output signal of signal amplification circuit enters the pin AIN1 of AD7734 through input end IN.Pin MCLKIN with MCLKOUT of AD7734 is connected the two ends of crystal oscillator X respectively, and the two ends of crystal oscillator X are electrically connected with ground GND through electric capacity Cad2 and Cad3 respectively simultaneously.The pin REFIN (+) of AD7734 is electrically connected with ground GND through electric capacity Cad1, connects the pin 3 of variable resistor Rad1 simultaneously.The pin REFIN (-) of AD7734 is electrically connected with ground GND, is electrically connected the pin 2 of variable resistor Rad1 simultaneously.The pin AIN4 of AD7734 is electrically connected the pin 1 of variable resistor Rad1.The pin DVdd of AD7734 connects+5V direct supply, is electrically connected through electric capacity Cad4 with ground GND simultaneously.The pin DGND of AD7734 is electrically connected with ground GND, is electrically connected through electric capacity Cad5 with pin DVdd simultaneously.The pin AVdd of AD7734 connects+5V AC power, is electrically connected through electric capacity Cad6 with ground GND simultaneously.The pin AGND of AD7734 is electrically connected with ground GND, is electrically connected through electric capacity Cad7 with pin AVdd simultaneously.The pin DOUT connection signal output terminal OUT of AD7734, exports the digital signal through conversion.
The digital signal obtained after A/D conversion is sent in CAN through CAN communication interface.PIC18F258CAN bus controller, photoelectrical coupler and MCP2551CAN bus transceiver that CAN communication interface circuit of the present invention is produced primarily of Microchip company are formed.The signal output part of analog to digital conversion circuit is electrically connected with the SDI port of CAN controller.The CANTX port of PIC18F258CAN bus controller is connected through the TXD port of photoelectrical coupler with CAN transceiver MCP2551, CANRX port is connected through the RXD port of photoelectrical coupler with CAN transceiver MCP2551, realize the electrical isolation of bus node by photoelectrical coupler, thus avoid the fault that is short-circuited.Port CANH, CANL of CAN transceiver MCP2551 are connected with CAN through resistance respectively; these resistance impact playing certain metering function from overcurrent to protect transceiver; CANH, CANL can also be connected with ground GND through an electric capacity respectively simultaneously, thus eliminate the interference of radio-frequency component in bus.The port RS of MCP2551 is electrically connected with ground GND through the resistance of 120 ohm.In CAN communication interface of the present invention, switching signal can also be provided by the RC3 port of PIC18F258CAN bus controller directly to metering system, and receive the fault-signal of metering system by port INT0.
In track scale metering system of the present invention, owing to have employed above-mentioned signal amplification circuit, analog to digital conversion circuit and CAN Design of Communication Interface, and special power circuit design, optimize the track scale metering system structure based on CAN of prior art, improve the measurement accuracy of weighing data, the navigability of metering system and anti-interference, provide system fault warning function, enhances signal processing circuit to adaptive faculty of sensor etc.
Above-described embodiment is only that technical scheme of the present invention is described by way of example, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, but those of ordinary skill in the art is to be understood that, it still can be modified to the technical scheme that previous embodiment is recorded, or equivalent replacement is carried out to wherein Partial Feature, and these amendments or equivalent replacement, do not make the essence of appropriate technical solution depart from the scope of the technical scheme of the embodiment of the present invention.
Claims (3)
1. the track scale metering system based on CAN, it comprises sensor circuit, signal amplification circuit, A/D change-over circuit, CAN interface circuit, CAN and host computer, resistance strain-gauge transducer is adopted in described sensor circuit, it is characterized in that: described signal amplification circuit is the two-stage differential amplifying circuit comprising two operational amplifier U1 and U2, external dc power is powered through voltage stabilizing and the backward described signal amplification circuit of filtering process; Described CAN interface circuit comprises CAN controller, optical coupler and CAN transceiver, described CAN controller is communicated by optical coupler with between CAN transceiver, and described CAN controller is arranged for the switching signal and the failure alarm signal that control described track scale metering system; Described sensor circuit comprises strain full-bridge circuit;
Wherein, described signal amplification circuit comprises the first order amplifying circuit with the first operational amplifier U1 and the second level amplifying circuit with the second operational amplifier U2; In the first order amplifying circuit comprising operational amplifier U1, signal input part IN+, IN-access pin 2 and the pin 3 of operational amplifier U1 respectively through resistance R1 and R2, form Differential Input; Signal input part IN+ is also electrically connected with electric capacity C2, the parallel circuit of signal input part IN-also contact resistance R3 and electric capacity C1, and the other end of electric capacity C1, C2 and resistance R3 is electrically connected, and wherein electric capacity C1 and C2 can provide filter action to input signal; The pin 1 of operational amplifier U1 to be formed with pin 8 through resistance R7 and is electrically connected; The pin 4 of operational amplifier U1 is electrically connected with ground GND; The pin 5 of operational amplifier U1 is connected to ground GND through resistance R5; The pin 6 of operational amplifier U1 is electrically connected with the pin 2 of operational amplifier U1 through the parallel circuit of resistance R17, resistance R4 and electric capacity C3 and resistance R1, forms Voltage Feedback amplifying return circuit; The pin 7 of operational amplifier U1 to be formed with power Vcc through resistance R8 and is electrically connected; Power Vcc is connected to ground GND by the parallel circuit of electric capacity C4 and electric capacity C5 and resistance R6, and the output signal for power Vcc provides voltage stabilizing process; The simulating signal of Differential Input exports first order amplifying signal through pin 6 after operational amplifier U1 amplifies; Second level amplifying circuit comprises operational amplifier U2, and the pin 6 of operational amplifier U1 is electrically connected to the pin 3 of operational amplifier U2 through resistance R11, is introduced by first order amplifying signal in the amplifying circuit of the second level; The pin 2 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R9 through resistance R10, the pin 3 of variable resistor R9 is electrically connected with power Vcc, and pin 2 is formed with ground GND and is electrically connected; The pin 1 of operational amplifier U2 is electrically connected with the pin 3 of variable resistor R14 through resistance R12, and the pin 8 of operational amplifier U2 is electrically connected to the pin 1 of variable resistor R14; The pin 7 of operational amplifier U2 is electrically connected with power Vcc through resistance R13; The pin 4 of operational amplifier U2 is electrically connected to ground GND through electric capacity C6, is electrically connected again through resistance R16 with power supply-Vcc simultaneously; The pin 5 of operational amplifier U2 is jointly formed with ground GND with first order amplifying circuit and is electrically connected; The pin 6 of operational amplifier U2 through resistance R15 connection signal output terminal OUT, simultaneously through electric capacity C7 electric connection of power supply-Vcc; Output terminal OUT is formed through electric capacity C8 be electrically connected with ground GND; Wherein, pin 1 and the resistance R10 of operational amplifier U2 form bleeder circuit, by regulating the resistance of variable resistor R9, can change the dividing potential drop resistance of resistance R10, realize the regulatory function of amplifying voltage; Introduce forward voltage by pin 2 and pin 3 forms Differential Input, can zeroing function be provided by the adjustment of forward input voltage, eliminate the output that causes due to electric bridge imbalance to the impact of input;
Described A/D change-over circuit adopts 24 ∑-△ type A/D converter AD7734, wherein, and the pin AIN1 connection signal input end IN of AD7734; Pin MCLKIN with MCLKOUT is connected the two ends of crystal oscillator X respectively, and the two ends of crystal oscillator X are electrically connected with ground GND through electric capacity Cad2 and Cad3 respectively simultaneously; Pin REFIN (+) is electrically connected with ground GND through electric capacity Cad1, connects the pin 3 of variable resistor Rad1 simultaneously; Pin REFIN (-) is electrically connected with ground GND, and be electrically connected the pin 2 of variable resistor Rad1, the pin 1 of variable resistor Rad1 is electrically connected with the pin AIN4 of converter simultaneously; Pin DVdd is connected to+5V direct supply, is electrically connected through electric capacity Cad4 with ground GND simultaneously; Pin DGND is electrically connected with ground GND, is electrically connected through electric capacity Cad5 with pin DVdd simultaneously; Pin AVdd connects+5V AC power, is electrically connected through electric capacity Cad6 with ground GND simultaneously; Pin AGND is electrically connected with ground GND, is electrically connected through electric capacity Cad7 with pin AVdd simultaneously; Pin DOUT connection signal output terminal OUT, exports the digital signal through conversion.
2., as claimed in claim 1 based on the track scale metering system of CAN, wherein, in described CAN interface circuit, described CAN controller is PIC18F258CAN bus controller, and described bus transceiver is MCP2551CAN bus transceiver; Digital signal is sent to the SDI port of described bus controller, the CANTX port of described bus controller is connected with the TXD port of described bus transceiver through photoelectrical coupler, CANRX port is connected with the RXD port of described bus transceiver through described photoelectrical coupler, port CANH, CANL of described bus transceiver are connected with CAN through resistance respectively, described port CANH, CANL are also connected with ground GND through electric capacity respectively, and the port RS of described bus transceiver is electrically connected with ground GND through 120 Ohmages.
3. as claimed in claim 1 or 2 based on the track scale metering system of CAN, wherein, the RC3 port of described CAN controller is arranged for the switch controlling metering system, and the port INT0 of described CAN controller is configured to the fault-signal receiving metering system.
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| CN105281794B (en) * | 2015-10-20 | 2017-10-31 | 晶焱科技股份有限公司 | The receiving circuit of ultra-wide common-mode input voltage range can be received |
| CN107144330A (en) * | 2017-05-24 | 2017-09-08 | 深圳市靖洲科技有限公司 | A kind of dynamic electron miniature self-service car weighing apparatus of diplopore cantilever beam foil gauge |
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