An automatic calibration device for electronic scales

Abstract

This utility model discloses an automatic calibration device for electronic scales. It comprises a frame with an electronic scale placed on a platform at the upper end. A weighing container is positioned above the electronic scale. A worm gear screw jack is placed on the side wall of the frame, with its extension end corresponding to a support ring on the weighing container. A weight-hanging hook is located below the electronic scale, and a weight set is hung below the hook at a corresponding position. The weight set is placed on a lifting platform, and the total weight of the weight set is one-tenth of the electronic scale's weighing range. The weighing container achieves equivalent weight substitution by injecting or draining water. The advantages of this utility model are: by combining an automated mechanical structure with a water substitution method, it can achieve online calibration of the electronic scale without manual intervention, offering advantages such as compact structure, high efficiency, and high accuracy.

Description

Technical Field

[0001] This utility model relates to the field of metrology and calibration technology, specifically to an automatic calibration device for electronic scales used in liquid flow standard devices. Background Technology

[0002] In liquid flow standard devices, the electronic scale serves as the core measuring device, and its accuracy directly affects the reliability of the flow calibration results. Traditional calibration methods rely on manually loading standard weights, which is cumbersome, inefficient, and prone to human error. Furthermore, frequent handling of weights can cause equipment wear and tear, and real-time online calibration is not possible. While some automation solutions have been proposed in existing technologies, they are often difficult to promote due to their complex structure, high cost, or insufficient adaptability. Therefore, there is an urgent need for a highly efficient, fully automated, and cost-effective electronic scale calibration device. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses an automatic calibration device for electronic scales.

[0004] The specific technical solution is as follows:

[0005] An automatic calibration device for an electronic scale includes a frame with an electronic scale placed on a platform at the upper end of the frame. A weighing container is positioned above the electronic scale. A screw jack is placed on the side wall of the frame, with its telescopic end corresponding to a support ring on the weighing container. A weight hook is located below the electronic scale, and a set of weights is hung below the hook at a corresponding position. The weight set is placed on a lifting platform, and the total weight of the weight set is one-tenth of the electronic scale's weighing range. The weighing container achieves equivalent substitution of the weight by injecting or draining water.

[0006] A drain outlet is provided on one side of the weighing container.

[0007] The drain outlet is equipped with an electronic water valve, which opens and closes the drain outlet via a rotating motor located above it.

[0008] A liquid level sensor is installed inside the weighing container.

[0009] The telescopic end of the turbine screw jack is equipped with a photoelectric sensor.

[0010] Furthermore, this application discloses an electronic control system for an automatic calibration device for electronic scales, including a PLC control module, a touch screen human-machine interaction module, a motor drive module, a hydraulic control module, and a sensor group. The PLC control module receives position, weight, and flow signals from the sensor group, drives the worm gear screw jack and lifting platform according to a preset calibration program, and sets parameters and generates calibration reports through the touch screen module. The PLC control module has a built-in linear error analysis algorithm that generates calibration correction coefficients based on the difference between the real-time measurement data of the electronic scale and the theoretical weight of the weights / water. The sensor group includes a photoelectric sensor for detecting the position of the weighing container, a flow meter for measuring the water volume, and a level sensor. All sensor signals are connected to the digital input port of the PLC control module.

[0011] The advantages of this invention are: through the linkage design of the turbine screw jack, the weight loading device and the control system, the electronic scale calibration process is fully automated: no manual handling of weights is required, the equivalent weight is loaded by water substitution, and the calibration program is preset by PLC and touch screen to automatically complete the lifting and lowering of the weighing container, weight loading, water volume control, data acquisition and error analysis; the structure is compact and the cost is controllable, which significantly improves the calibration efficiency and accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is the front view of the present utility model;

[0014] Figure 3 This is a working logic block diagram of the present invention. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] An automatic calibration device for an electronic scale includes a frame 7. An electronic scale 2 is placed on the upper platform of the frame 7. A weighing container 1 is placed above the electronic scale 2. A screw jack 3 is placed on the side wall of the frame 7. The telescopic end of the screw jack 3 is correspondingly set with a support ring on the weighing container 1, so that the screw jack 3 can engage with the support ring to lift the weighing container 1 when it is raised or lowered. A weight hanging hook 4 is set below the electronic scale 2. A weight set 5 is hung below the weight hanging hook 4 at a corresponding position. The weight set 5 is placed on a lifting platform 6. The total weight of the weight set 5 is one-tenth of the weighing range of the electronic scale 2. The weighing container 1 achieves equivalent substitution of the weight by injecting or draining water.

[0017] A drain outlet 8 is provided on one side of the weighing container 1.

[0018] The drain outlet 8 is equipped with an electronic water valve, which opens and closes the drain outlet via a rotating motor 9 located above it.

[0019] A liquid level sensor is installed inside the weighing container.

[0020] The telescopic end of the turbine screw jack is equipped with a photoelectric sensor 10.

[0021] Furthermore, this application discloses an electronic control system for an automatic calibration device for electronic scales, including a PLC control module, a touch screen human-machine interaction module, a motor drive module, a hydraulic control module, and a sensor group. The PLC control module receives position, weight, and flow signals from the sensor group, drives the worm gear screw jack and lifting platform according to a preset calibration program, and sets parameters and generates calibration reports through the touch screen module. The PLC control module has a built-in linear error analysis algorithm that generates a calibration correction coefficient based on the difference between the real-time measurement data of the electronic scale and the theoretical weight of the weights / water. The sensor group includes a photoelectric sensor for detecting the position of the weighing container, a flow meter for measuring the water volume, and a liquid level sensor. All sensor signals are connected to the digital input port of the PLC control module.

[0022] The working principle of this utility model is as follows: The weighing container 1 is fixed to the lifting platform of the worm gear screw jack 3. The drive motor of the worm gear screw jack is controlled by the PLC. The upper / lower limit photoelectric sensor 1a detects the lifting position signal (such as when the weighing container is removed from the electronic scale, the upper limit sensor is triggered). The weight loading device 6 is located below the electronic scale 2 through the hydraulic drive arm weight hook 4. The weight hook hangs the weight group 5 to the bottom mounting point of the electronic scale. When shrinking, the weight is unloaded. The flow meter on the weighing container pipeline monitors the water injection / drainage flow rate, and the liquid level sensor monitors the water volume in the water tank to ensure that the water volume is equivalent to the weight of the weight. Then, equivalent substitution is achieved by controlling the water injection volume. When the water volume is equivalent to the weight of the weight, the next set of weights is added. The above steps are repeated to make the water volume and weight of the weight equivalent again. Finally, the calibration of the entire weight of the weight group is completed.

[0023] Control Flow: The scale's range and calibration points (e.g., 10%, 20%, ... 100% range) are input via the touchscreen. The PLC generates the corresponding water volume for each calibration point using a preset calculation formula. Calibration Start: The PLC drives the lift to raise the weighing container until it is detached from the scale (triggered by the upper limit sensor). Then, it controls the hydraulic drive arm to attach the weight set, simultaneously starting the water pump to fill the weighing container. The flow meter provides real-time flow feedback. The process stops once the preset water volume is reached. Data Acquisition: The scale outputs weight data to the PLC in real-time, compares it with the weight of the weights, calculates the error, and generates a calibration coefficient. Calibration Completion: The PLC controls the unloading of the weights and the discharge of water. The lift lowers and resets the weighing container, and the touchscreen stores the calibration report.

Claims

1. An automatic calibration device for electronic scales, characterized in that: A frame is provided, with an electronic scale placed on the upper platform of the frame. A weighing container is placed above the electronic scale. A screw jack is placed on the side wall of the frame, with the telescopic end of the screw jack corresponding to the support ring on the weighing container. A weight hook is provided below the electronic scale, and a set of weights is hung below the corresponding position. The set of weights is placed on the lifting platform, and the total weight of the set of weights is one-tenth of the electronic scale's weighing range. The weighing container achieves equivalent substitution of the weight by injecting or draining water.

2. The automatic calibration device for electronic scales according to claim 1, characterized in that: A drain outlet is provided on one side of the weighing container.

3. The automatic calibration device for electronic scales according to claim 2, characterized in that: The drain outlet is equipped with an electronic water valve, which opens and closes the drain outlet via a rotating motor located above it.

4. The automatic calibration device for electronic scales according to claim 1, characterized in that: A liquid level sensor is installed inside the weighing container.

5. The automatic calibration device for electronic scales according to claim 1, characterized in that: The telescopic end of the turbine screw jack is equipped with a photoelectric sensor.

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