CN209910809U - Electronic scale with anti-interference effect - Google Patents

Abstract

The utility model discloses an electronic scale with anti-interference effect, including MCU, weighing module and display module, weighing module includes pressure sensor, PCB board, shield cover and analog-to-digital conversion module, the shield cover is installed on the PCB board, analog-to-digital conversion module sets up in the shield cover, pressure sensor's output and analog-to-digital conversion module's input are connected, analog-to-digital conversion module's output is connected with MCU's input, MCU's output and display module's input are connected. The utility model discloses an add the shield cover directly over the analog-to-digital conversion module to through the shield cover reflection or absorb the interference of external electromagnetic field to the analog-to-digital conversion module, thereby it is more accurate to make the analog-to-digital conversion module export MCU's the signal of telecommunication, the measuring result who obtains is also more accurate. The utility model discloses but wide application in weighing equipment field.

Description

Electronic scale with anti-interference effect

Technical Field

The utility model belongs to the technical field of weighing equipment and specifically relates to an electronic scale with anti-interference effect.

Background

An electronic scale is a kind of weighing apparatus, in particular to a tool for measuring the mass of an object by utilizing Hooke's law or the lever balance principle of force. Scales can be divided into three categories, namely mechanical scales, electronic scales and electromechanical scales according to the structural principle. The electronic scale adopts an electronic weighing device integrating sensor technology, electronic technology and computer technology, so that the electronic scale has the characteristics of rapidness, accuracy, continuity and automatic weighing. However, as more and more electronic devices are provided near people, in a use scene of the electronic scale, an existing electromagnetic field is more and more complex, so that a sensitive device on the electronic scale is easily interfered by the electromagnetic field, and an obtained measurement result is inaccurate.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims to provide a: the electronic scale with the anti-interference effect is provided, and the device for shielding the electromagnetic field is carried in the electronic scale, so that the measurement result is more accurate.

The utility model adopts the technical proposal that:

the utility model provides an electronic scale with anti-interference effect, includes MCU, weighing module and display module, weighing module includes pressure sensor, PCB board, shield cover and analog-to-digital conversion module, the shield cover is installed on the PCB board, the analog-to-digital conversion module sets up in the shield cover, pressure sensor's output and analog-to-digital conversion module's input are connected, analog-to-digital conversion module's output and MCU's input are connected, MCU's output and display module's input are connected.

Furthermore, the shielding case is welded on the PCB through welding pins, and the number of the welding pins is at least three and at least one welding pin is grounded.

And the output end of the keyboard module is connected with the input end of the MCU.

Furthermore, the weighing module also comprises an amplifier, the input end of the amplifier is connected with the output end of the pressure sensor, and the output end of the amplifier is connected with the input end of the analog-to-digital conversion module.

Further, still include the balance body, connecting rod and operation panel, the balance body is used for placing weighing module, the operation panel is used for placing MCU and display module, the first end fixed connection balance body of connecting rod, the second end fixed connection operation panel of connecting rod.

Further, the connecting rod is of a hollow structure.

The utility model has the advantages that: the utility model discloses an add the shield cover in the weighing module to with the analog-to-digital conversion module setting in the shield cover, make the electronic scale in the course of the work, through the shield cover reflection or absorb the interference of external electromagnetic field to the analog-to-digital conversion module, thereby make the analog-to-digital conversion module export MCU's the signal of telecommunication more accurate, the measuring result who obtains is also more accurate.

Drawings

FIG. 1 is a block diagram of an electronic scale with anti-interference effect according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural diagram of a PCB board, a shielding case and an analog-to-digital conversion module according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a front structure of an electronic scale with anti-interference effect according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a reverse structure of an electronic scale with anti-interference effect according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an analog-to-digital conversion module according to an embodiment of the present invention.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments.

Referring to fig. 1, an electronic scale with anti-interference effect includes an MCU, a weighing module and a display module, where the weighing module includes a pressure sensor, a PCB, a shielding cover and an analog-to-digital conversion module, a cross-sectional view of a connection relationship between the shielding cover, the PCB and the analog-to-digital conversion module is shown in fig. 2, the shielding cover 300 is installed on the PCB 100, the analog-to-digital conversion module 200 is disposed in the shielding cover 300, the shielding cover 300 is a metal casing or other casing with electromagnetic field reflection or absorption function, and the shielding cover 300 is welded on the PCB 100 through a solder leg 301. The output end of the pressure sensor is connected with the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the MCU, and the output end of the MCU is connected with the input end of the display module.

And the pressure sensor is used for detecting the acting force of the weighing object on the scale body, converting the detected acting force into an analog signal and outputting the analog signal to the analog-to-digital conversion module.

And the analog-to-digital conversion module is used for converting the analog signal transmitted by the pressure sensor into a digital signal and transmitting the digital signal to the MCU, so that the MCU processes the digital signal and outputs a display control signal to the display module.

And the display module is used for displaying information such as the name and the weight of the weighing object.

When the electronic scale is used for measuring, the pressure sensor detects the weight of an object, an analog signal is output to the analog-to-digital conversion module according to the weight, the analog-to-digital conversion module converts the analog signal to obtain a digital signal, the digital signal is output to the MCU, the MCU generates a display control signal of the display module according to the digital signal, and the analog-to-digital conversion module is a sensitive circuit and is very easily interfered by an external electromagnetic field in the working process. The shield can may be a metal housing.

In some specific embodiments, referring to fig. 3 and 4, the display module includes a main display module 602 and a customer display module 603, and the main display module 602 is disposed on the front surface of the console 600 in a semi-embedded manner for displaying the operation content of the electronic scale, so that an operator can conveniently view the unit price, the total price, the weight and the setting information of the electronic scale. The main display module 602 may employ a 128 x 32 dot matrix LCD screen. The guest display module 603 is disposed on the back of the console 600 in a semi-embedded manner, so that other people can conveniently view information such as unit price, total price, weight, and the like. The customer display module 603 may use 5 × 8 nixie tubes or 5 × 9 nixie tubes.

The MCU can adopt a chip model of STC11F 02E. The analog-to-digital conversion module may adopt a design as shown in fig. 5, P1 in fig. 5 is a five-interface jumper disk, the analog-to-digital conversion module may adopt a chip model HX710B, AVDD in fig. 5 is an external power supply, AGND is grounded, pin 5 and pin 6 of chip HX710B are both connected to an I/O port of the MCU, specifically, pin DOUT of chip HX710B is a data output terminal, and pin SCK of chip HX710B is a serial clock signal input terminal.

In a preferred embodiment, referring to fig. 2, the shielding can 300 is soldered on the PCB board 100 by solder tails 301, the number of solder tails 301 is at least three, and at least one solder tail 301 is grounded. The shield cover 300 is fixed on the PCB 100 through at least three solder legs 301, so that the shield cover 300 is more stable in welding, meanwhile, the solder legs 301 have a certain height, so that a certain space can be formed between the shield cover 300 and the PCB 100, the analog-to-digital conversion module 200 can be arranged in the space between the PCB 100 and the shield cover 300, so that the shield cover 300 can more effectively shield the interference of an external electromagnetic field to the analog-to-digital conversion module 200, and one of the solder legs is grounded, so that the electromagnetic field absorbed by the shield cover 300 can be led into the ground wire.

As a preferred embodiment, referring to fig. 1 and fig. 3, the system further includes a keyboard module 601, and an output terminal of the keyboard module 601 is connected to an input terminal of the MCU. The keyboard module is used for inputting operation information of a user. The keyboard module 601 is arranged on the front surface of the operation table in a semi-embedded mode, so that operation of an operator is facilitated. The keyboard can be formed by large-particle protruding keys.

As a preferred embodiment, as shown in fig. 1, the weighing module further includes an amplifier, an input end of the amplifier is connected to an output end of the pressure sensor, and an output end of the amplifier is connected to an input end of the analog-to-digital conversion module. The amplifier is used for amplifying the analog signal output by the pressure sensor, and is convenient for the processing process of the analog-to-digital conversion module.

As a preferred embodiment, as shown in fig. 3 and 4, the scale further includes a scale body 400, a connecting rod 500 and a console 600, wherein the scale body 400 is used for placing a weighing module, the console 600 is used for placing an MCU, a first end of the connecting rod 500 is fixedly connected to the scale body 400, and a second end of the connecting rod 500 is fixedly connected to the console 600. The weighing module, the MCU and the display module are installed separately, so that the scale body is prevented from burning out the MCU and the display module due to water inflow.

As a preferred embodiment, as shown in fig. 3 and 4, the connecting rod 500 has a hollow structure. The connecting rod 500 is provided as a hollow structure, so that it is convenient to place electric wires for connecting the internal module of the scale body 400 and the module on the operation table 600.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims (6)

1. An electronic scale with anti-interference effect, its characterized in that: including MCU, weighing module and display module, weighing module includes pressure sensor, PCB board, shield cover and analog-to-digital conversion module, the shield cover is installed on the PCB board, the analog-to-digital conversion module sets up in the shield cover, pressure sensor's output is connected with analog-to-digital conversion module's input, analog-to-digital conversion module's output is connected with MCU's input, MCU's output is connected with display module's input.

2. The electronic scale with interference rejection of claim 1, wherein: the shielding cover is welded on the PCB through the welding feet, the number of the welding feet is at least three, and at least one welding foot is grounded.

3. The electronic scale with interference rejection of claim 1, wherein: the keyboard module is further included, and the output end of the keyboard module is connected with the input end of the MCU.

4. The electronic scale with interference rejection of claim 1, wherein: the weighing module further comprises an amplifier, the input end of the amplifier is connected with the output end of the pressure sensor, and the output end of the amplifier is connected with the input end of the analog-to-digital conversion module.

5. The electronic scale with interference rejection of claim 1, wherein: still include the balance body, connecting rod and operation panel, the balance body is used for placing weighing module, the operation panel is used for placing MCU and display module, the first end fixed connection balance body of connecting rod, the second end fixed connection operation panel of connecting rod.

6. An electronic scale with interference rejection according to claim 5, wherein: the connecting rod is of a hollow structure.

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