CN215573292U - Vehicle weighing system - Google Patents
Vehicle weighing system Download PDFInfo
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- CN215573292U CN215573292U CN202120963435.1U CN202120963435U CN215573292U CN 215573292 U CN215573292 U CN 215573292U CN 202120963435 U CN202120963435 U CN 202120963435U CN 215573292 U CN215573292 U CN 215573292U
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Abstract
The utility model relates to the technical field of logistics transportation, and provides a vehicle weighing system which comprises a weighing circuit and a display circuit which are connected with a main control circuit, wherein the weighing circuit comprises a bridge circuit and an amplifying circuit which are connected in sequence, the bridge circuit comprises a resistor RS, a resistor R1, a resistor R2 and a resistor R3, the resistor RS is a strain gauge, the amplifying circuit comprises an operational amplifier U1A, an operational amplifier U1B and an operational amplifier U1C, a series point of the resistor RS and the resistor R3 is connected to a non-inverting input end of the operational amplifier U1A, an output end of the operational amplifier U1A is connected to an inverting input end through a resistor R5, a series point of the resistor R1 and the resistor R2 is connected to a non-inverting input end of the operational amplifier U1B, an output end of the operational amplifier U1A is connected to an inverting input end through a resistor R6, and a potentiometer RP1 is connected between the inverting input end of the operational amplifier U1A and the inverting input end of the operational amplifier U1B. Through above-mentioned technical scheme, the problem that vehicle weighing system measurement accuracy is low among the prior art has been solved.
Description
Technical Field
The utility model relates to the technical field of logistics transportation, in particular to a vehicle weighing system.
Background
With the rapid development of national economy and electricity business, the logistics industry has been developed at a high speed. The traditional manual weighing operation is low in efficiency and cannot meet the efficient weighing requirement, so that various vehicle weighing systems appear in the market to realize automatic weighing of vehicles, but the metering precision of the current vehicle weighing system is still to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vehicle weighing system, which solves the problem of low metering accuracy of the vehicle weighing system in the prior art.
The technical scheme of the utility model is as follows: comprises a weighing circuit and a display circuit which are connected with a main control circuit, wherein the weighing circuit comprises a bridge circuit and an amplifying circuit which are connected in sequence,
the bridge circuit comprises a resistor RS, a resistor R1, a resistor R2 and a resistor R3, wherein the resistor RS is a strain gauge,
the amplifying circuit comprises an operational amplifier U1A, an operational amplifier U1B and an operational amplifier U1C, the series point of a resistor RS and a resistor R3 is connected to the non-inverting input end of the operational amplifier U1A, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R5,
the series point of the resistor R1 and the resistor R2 is connected to the non-inverting input end of the operational amplifier U1B, the output end of the operational amplifier U1A is connected to the inverting input end through the resistor R6, a potentiometer RP1 is connected between the inverting input end of the operational amplifier U1A and the inverting input end of the operational amplifier U1B,
the output of fortune U1A is put the non inverting input end that U1C was put in fortune, the output access that U1B was put in fortune U1C's inverting input end, U1C's output is put through resistance R10 access inverting input end to fortune, U1C's output access is put to fortune AD passageway of master control circuit.
Further, the intelligent control circuit further comprises an output filter circuit, the output filter circuit comprises a resistor R4 and a capacitor C2, one end of the resistor R4 is connected with the output end of the operational amplifier U1C, the other end of the resistor R4 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, and the series point of the resistor R4 and the capacitor C2 is connected with the main control circuit.
Further, the weighing circuit still includes the zero setting circuit, the zero setting circuit includes resistance R13, potentiometre RP2 and resistance R14 that connect in series, resistance R13's one end is connected with power 12V, resistance R14's one end ground connection, potentiometre RP 1's slip end inserts the inverting input end of op-amp U1C.
Furthermore, an operational amplifier U1D is arranged between the sliding end of the potentiometer RP2 and the inverting input end of the operational amplifier U1C,
the non-inverting input end of the operational amplifier U1D is connected with the sliding end of a potentiometer RP2, the inverting input end of the operational amplifier U1D is connected with the output end, and the output end of the operational amplifier U1D is connected with the inverting input end of the operational amplifier U1C.
Further, the display circuit includes signal conversion chip U3 and compound transistor U4, signal conversion chip U3's input with master control circuit connects, signal conversion chip U3's output is connected with the section code control end of charactron, compound transistor U4's input with master control circuit connects, compound transistor U4's output is connected with the bit code control end of charactron.
Further, still include the voice broadcast circuit, the voice broadcast circuit includes voice chip U2, voice chip U2's input with master control circuit connects, voice chip U2's output and speaker are connected.
The working principle and the beneficial effects of the utility model are as follows:
when the vehicle is weighed, the vehicle is placed on the weighing platform, the gravity of the vehicle causes the deformation of the strain gauge, so that the resistance RS of the strain gauge is changed, a bridge circuit consisting of the resistance RS, the resistance R1, the resistance R2 and the resistance R3 outputs a weak voltage signal, and the magnitude of the voltage signal is proportional to the weight of the vehicle. The operational amplifier U1A and the operational amplifier U1B form a differential amplification circuit, the output voltage of a bridge circuit is amplified, the output voltage of the operational amplifier U1A is connected to the non-inverting input end of the operational amplifier U1C, the output voltage of the operational amplifier U1B is connected to the inverting input end of the operational amplifier U1C, the double-end output of the operational amplifier U1A and the double-end output of the operational amplifier U1B are converted into single-end output by the operational amplifier U1C, the single-end output is input to an AD channel of the main control circuit, and the main control circuit can obtain the weight of the vehicle by reading the output voltage of the operational amplifier U1C and displays the weight through the display circuit.
The utility model realizes the accurate weighing of the vehicle, and has simple circuit structure and reliable work.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a weighing circuit of the present invention;
FIG. 2 is a schematic diagram of a display circuit of the present invention;
fig. 3 is a schematic diagram of a voice broadcast circuit according to the present invention;
in the figure: 7 display circuit, 8 weighing circuit, 9 voice broadcast circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1, the vehicle weighing system of the present embodiment includes a weighing circuit and a display circuit both connected to a main control circuit, the weighing circuit includes a bridge circuit and an amplifying circuit connected in sequence,
the bridge circuit comprises a resistor RS, a resistor R1, a resistor R2 and a resistor R3, wherein the resistor RS is a strain gauge,
the amplifying circuit comprises an operational amplifier U1A, an operational amplifier U1B and an operational amplifier U1C, the series point of a resistor RS and a resistor R3 is connected to the non-inverting input end of the operational amplifier U1A, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R5,
the series point of the resistor R1 and the resistor R2 is connected with the non-inverting input end of the operational amplifier U1B, the output end of the operational amplifier U1A is connected with the inverting input end through the resistor R6, a potentiometer RP1 is connected between the inverting input end of the operational amplifier U1A and the inverting input end of the operational amplifier U1B,
the output end of the operational amplifier U1A is connected to the non-inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1B is connected to the inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1C is connected to the inverting input end through a resistor R10, and the output end of the operational amplifier U1C is connected to the AD channel of the main control circuit.
In the embodiment, when the vehicle is weighed, the vehicle is placed on the weighing platform, the gravity of the vehicle causes the deformation of the strain gauge, so that the resistance RS of the strain gauge is changed, a bridge circuit consisting of the resistance RS, the resistance R1, the resistance R2 and the resistance R3 outputs a weak voltage signal, and the magnitude of the voltage signal is proportional to the weight of the vehicle. The operational amplifier U1A and the operational amplifier U1B form a differential amplification circuit, the output voltage of a bridge circuit is amplified, the output voltage of the operational amplifier U1A is connected to the non-inverting input end of the operational amplifier U1C, the output voltage of the operational amplifier U1B is connected to the inverting input end of the operational amplifier U1C, the double-end output of the operational amplifier U1A and the double-end output of the operational amplifier U1B are converted into single-end output by the operational amplifier U1C, the single-end output is input to an AD channel of the main control circuit, and the main control circuit can obtain the weight of the vehicle by reading the output voltage of the operational amplifier U1C and displays the weight through the display circuit.
The embodiment realizes accurate weighing of the vehicle, and has simple circuit structure and reliable work.
Further, the output filter circuit is further included, as shown in fig. 1, the output filter circuit includes a resistor R4 and a capacitor C2, one end of the resistor R4 is connected to the output end of the operational amplifier U1C, the other end of the resistor R4 is connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, and the series point of the resistor R4 and the capacitor C2 is connected to the main control circuit.
The resistor R4 and the capacitor C2 form a low-pass filter circuit for filtering high-frequency signals output by the operational amplifier U1C and ensuring that the main control circuit reads accurate voltage values.
Further, the weighing circuit also comprises a zero setting circuit, as shown in fig. 1, the zero setting circuit comprises a resistor R13, a potentiometer RP2 and a resistor R14 which are connected in series, one end of the resistor R13 is connected with the power supply 12V, one end of the resistor R14 is grounded, and the sliding end of the potentiometer RP1 is connected to the inverting input end of the operational amplifier U1C.
When no vehicle exists on the weighing platform, the output voltage of the operational amplifier U1C should be zero, if the output voltage is not zero, a bias voltage is superposed on the inverting input end of the operational amplifier U1C through a zero setting circuit, and the output voltage of the operational amplifier U1C is zero when no vehicle exists on the weighing platform through adjusting the resistance value of a potentiometer RP 2.
Further, as shown in fig. 1, an operational amplifier U1D is further disposed between the sliding end of the potentiometer RP2 and the inverting input end of the operational amplifier U1C,
the non-inverting input end of the operational amplifier U1D is connected with the sliding end of the potentiometer RP2, the inverting input end of the operational amplifier U1D is connected with the output end, and the output end of the operational amplifier U1D is connected with the inverting input end of the operational amplifier U1C.
The operational amplifier U1D forms a voltage follower, the divided voltage of the potentiometer RP2 is connected to the inverting input end of the operational amplifier U1C through the voltage follower, the impedance matching effect is achieved, and the reliable work of the circuit is guaranteed.
Further, as shown in fig. 2, the display circuit includes a signal conversion chip U3 and a composite transistor U4, an input terminal of the signal conversion chip U3 is connected to the main control circuit, an output terminal of the signal conversion chip U3 is connected to the segment code control terminal of the nixie tube, an input terminal of the composite transistor U4 is connected to the main control circuit, and an output terminal of the composite transistor U4 is connected to the bit code control terminal of the nixie tube.
The display circuit adopts a form that the main control circuit drives the nixie tube, wherein the main control circuit outputs segment code control signals to the input end of the signal conversion chip U3, and the signal conversion chip U3 outputs eight parallel signals to the segment code control end of the nixie tube, thereby being beneficial to saving the I/O resources of the main control circuit; meanwhile, the main control circuit outputs a bit code control signal to the input end of the composite transistor U4, the composite transistor U4 amplifies the input signal, and the corresponding bit code of the nixie tube is driven to be displayed.
Further, as shown in fig. 3, still include the voice broadcast circuit, the voice broadcast circuit includes voice chip U2, and voice chip U2's input is connected with master control circuit, and voice chip U2's output is connected with the speaker.
After weighing, master control circuit sends weight data to voice chip U2, and voice chip U2 converts data into voice signal, outputs to the speaker, carries out the real-time report of weighing data.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The vehicle weighing system is characterized by comprising a weighing circuit and a display circuit which are connected with a main control circuit, wherein the weighing circuit comprises a bridge circuit and an amplifying circuit which are connected in sequence,
the bridge circuit comprises a resistor RS, a resistor R1, a resistor R2 and a resistor R3, wherein the resistor RS is a strain gauge,
the amplifying circuit comprises an operational amplifier U1A, an operational amplifier U1B and an operational amplifier U1C, the series point of a resistor RS and a resistor R3 is connected to the non-inverting input end of the operational amplifier U1A, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R5,
the series point of the resistor R1 and the resistor R2 is connected to the non-inverting input end of the operational amplifier U1B, the output end of the operational amplifier U1A is connected to the inverting input end through the resistor R6, a potentiometer RP1 is connected between the inverting input end of the operational amplifier U1A and the inverting input end of the operational amplifier U1B,
the output of fortune U1A is put the non inverting input end that U1C was put in fortune, the output access that U1B was put in fortune U1C's inverting input end, U1C's output is put through resistance R10 access inverting input end to fortune, U1C's output access is put to fortune AD passageway of master control circuit.
2. The vehicle weighing system of claim 1, further comprising an output filter circuit, wherein the output filter circuit comprises a resistor R4 and a capacitor C2, one end of the resistor R4 is connected to the output terminal of the operational amplifier U1C, the other end of the resistor R4 is connected to one end of a capacitor C2, the other end of the capacitor C2 is grounded, and a series connection of the resistor R4 and the capacitor C2 is connected to the main control circuit.
3. The vehicle weighing system of claim 1, wherein the weighing circuit further comprises a zero-setting circuit, the zero-setting circuit comprises a resistor R13, a potentiometer RP2 and a resistor R14 which are connected in series, one end of the resistor R13 is connected with a power supply 12V, one end of the resistor R14 is grounded, and a sliding end of the potentiometer RP1 is connected to an inverting input end of the operational amplifier U1C.
4. A vehicle weighing system according to claim 3, wherein an operational amplifier U1D is further provided between the sliding end of the potentiometer RP2 and the inverting input end of the operational amplifier U1C,
the non-inverting input end of the operational amplifier U1D is connected with the sliding end of a potentiometer RP2, the inverting input end of the operational amplifier U1D is connected with the output end, and the output end of the operational amplifier U1D is connected with the inverting input end of the operational amplifier U1C.
5. The vehicle weighing system of claim 1, wherein the display circuit comprises a signal conversion chip U3 and a composite transistor U4, an input end of the signal conversion chip U3 is connected with the main control circuit, an output end of the signal conversion chip U3 is connected with a segment code control end of a nixie tube, an input end of the composite transistor U4 is connected with the main control circuit, and an output end of the composite transistor U4 is connected with a bit code control end of the nixie tube.
6. The vehicle weighing system of claim 1, further comprising a voice broadcast circuit, wherein the voice broadcast circuit comprises a voice chip U2, an input end of the voice chip U2 is connected with the main control circuit, and an output end of the voice chip U2 is connected with a speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120963435.1U CN215573292U (en) | 2021-05-07 | 2021-05-07 | Vehicle weighing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120963435.1U CN215573292U (en) | 2021-05-07 | 2021-05-07 | Vehicle weighing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215573292U true CN215573292U (en) | 2022-01-18 |
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ID=79859121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120963435.1U Active CN215573292U (en) | 2021-05-07 | 2021-05-07 | Vehicle weighing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215573292U (en) |
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2021
- 2021-05-07 CN CN202120963435.1U patent/CN215573292U/en active Active
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