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Weighing equipment, and state detection device and method of weighing sensor group

The technology of a state detection device and a weighing sensor, applied in the weighing field, can solve the problems of limited display state information, and achieve the effect of convenient maintenance and use.

Pending Publication Date: 2021-03-30
METTLER TOLEDO (CHANGZHOU) MEASUREMENT TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a detection device and a detection method that can provide more detailed load cell connection state information in view of the problem that the state detection method of the existing load cell has limited display state information

Method used

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  • Weighing equipment, and state detection device and method of weighing sensor group
  • Weighing equipment, and state detection device and method of weighing sensor group
  • Weighing equipment, and state detection device and method of weighing sensor group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the weighing device includes a load cell group consisting of four load cells and a weighing instrument connected thereto. Among them, the weighing instrument uses constant voltage power supply for the power supply system of the load cell, and the load cell is an analog load cell.

[0029] A state detection device for a load cell is integrated in a micro control unit chip (Micro Controller Unit, MCU) of the weighing instrument, including a sampling circuit. Such as figure 2 As shown, it includes a sampling resistor and an analog-to-digital converter (AD converter). The sampling resistor is set at the monitoring end of the constant voltage power supply. When the power output of the weighing instrument starts to supply power to the load cell, the analog-to-digital converter detects the voltage on the sampling resistor, thereby realizing the power supply sampling of the load cell group.

[0030] In practical applications, if the type of the l...

Embodiment 2

[0039] like figure 1 As shown, the weighing device includes a load cell group consisting of four load cells and a weighing instrument connected thereto. Among them, the power supply system of the weighing instrument to the load cell is powered by a constant voltage source, and the load cell is an analog load cell.

[0040] The MCU of the weighing instrument is integrated with a state detection device of the load cell, including a sampling circuit. like image 3 As shown, the sampling circuit includes a sampling resistor and an analog-to-digital converter (AD converter). Set between the excitation terminal of the weighing instrument and the output of the power supply, it can be a positive excitation terminal or a negative excitation terminal. When the power output of the weighing instrument starts to supply power to the load cell, the analog-to-digital converter detects the voltage on the sampling resistor, thereby realizing the power supply sampling of the load cell group. ...

Embodiment 3

[0047] A load cell status method in this embodiment can be applied to the weighing instrument in the above-mentioned embodiment 1 or 2 to detect the connection status of the load cell. A state detection device of a load cell is integrated in the MCU of the weighing instrument, including a sampling circuit. like figure 2 As shown, the sampling circuit includes a sampling resistor and an analog-to-digital converter (AD converter).

[0048] like image 3 As shown, the status method of the load cell includes:

[0049] Step S101, calculating the corresponding relationship between the theoretical voltage value of the sampling resistor and the number of load cells.

[0050] In practical applications, if the type of the load cell is known, its related data are all known. Assume that the known excitation voltage of the load cell is U 0 , the impedance is R 0 , then the current theoretical value I of a single load cell 0 For: I 0 =U 0 / R 0 . At the same time, since the load ...

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PUM

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Abstract

The invention provides a weighing device, and a state detection device and method of a weighing sensor group, and the device comprises a sampling circuit which is disposed in a microprocessor of the weighing device, and is connected to a constant voltage source and used for acquiring actually-measured sampling data; a microprocessor which is used for diagnosing the working state of the weighing equipment according to the ratio of the preset value corresponding to the number and specification parameters of the weighing sensors to the actually measured data of the circuit, and further diagnosingthe access number f (n) = g (a, b) of the weighing sensors; wherein n is the number of the weighing sensors, a is the actual measurement sampling data, and b is the preset value. Through the state detection device of the weighing sensor group, more detailed weighing sensor connection state information can be provided.

Description

technical field [0001] The invention relates to the technical field of weighing, in particular to a weighing device and a state detection device and method of a load cell group. Background technique [0002] In weighing applications, in order to improve weighing accuracy, multiple load cells are installed at different positions of the weighing equipment. Especially for high-precision electronic weighing instruments, usually more than two sensors are included to form a weighing sensor system, and it is rare to use a single weighing sensor. For small weighing equipment, setting multiple weighing sensors can reduce the impact of the weighing object on the weighing result due to the relationship between the placement position; for large weighing equipment, on the one hand, it can maintain the stability of the scale itself, and on the other hand On the one hand, the weighing weight can also be increased. [0003] The load cell is connected to the weighing instrument, and the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G23/01
CPCG01G23/01
Inventor 王树强潘菁菁沈洋
Owner METTLER TOLEDO (CHANGZHOU) MEASUREMENT TECH CO LTD
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