Angular-difference-free adjustment device for multi-weighing-sensor group scale system

Abstract

The utility model discloses an angular difference adjustment-free device for a multi-weighing sensor group scale system, which comprises a plurality of group bridge plates connected in parallel, each group bridge plate comprises a single weighing sensor circuit board and a compensation resistor, the compensation resistor comprises three resistors used for compensating the output impedance of the weighing sensor, and the three resistors are connected in parallel. The three resistors are connected with the output end of the single weighing sensor circuit board in series, two of the three resistors are located on one side of a bridge circuit of the single weighing sensor circuit board, and the remaining resistor is located on the other side of the bridge circuit of the single weighing sensor circuit board. The angular-difference-adjustment-free device for the multi-weighing-sensor group scale system can control a single weighing sensor to output an asymmetric difference value of impedance, an angular-difference adjustment procedure is omitted, time and labor are saved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to a device for multi-load cell weighing system without corner difference adjustment. Background Art

[0002] Multi-load cell weighing systems are widely used in industrial production, logistics transportation, commercial trade and other fields to accurately measure and record the weight of objects, realize automatic and intelligent control, detection and fault prevention. According to the design requirements, load cells will be installed at relevant parts of the weighing body. The load cells are connected to a weighing instrument through a junction box. The function of the junction box is, on the one hand, to play a "wiring" role, "summarize" the output signals of the load cells and provide them to the instrument, and on the other hand, it can compensate and correct the four-corner deviation. However, in actual applications, since adjusting the corner difference of the weighing system by the junction box greatly increases the labor cost and production cost, resulting in a decrease in customer satisfaction, therefore, finding a method for multi-load cell weighing system without corner difference adjustment has become an urgent need for enterprises.

[0003] In order to meet the accuracy requirements of the weighing system, loads need to be applied at the middle and four corners of the weighing body respectively. Due to the differences between load cells, there are differences in the loads at the four corners. If the difference between the weights at the four corners and the weight at the middle position exceeds the metrological requirements, then it is necessary to adjust the potentiometer at the junction box to ensure that the weights at different positions are within the allowable difference range. This process is very cumbersome and time-consuming.

[0004] Currently, it is relatively easy to control the consistency of the ratio E / R of the output sensitivity and output impedance of a single load cell. Many enterprises are indeed controlling this factor. However, experimental data shows that for weighing systems with low accuracy requirements, simply controlling the consistency of the ratio E / R of the output sensitivity and output impedance of a single load cell can also achieve corner difference-free adjustment. For high-precision weighing systems, such as C3 level and higher levels, simply controlling this factor of the ratio E / R of the output sensitivity and output impedance of a single load cell is still not enough. The corner difference will still exceed the allowable range when multiple load cells are used for weighing, and manual adjustment of the corner difference is still required, which is very cumbersome, time-consuming, labor-intensive and costly. Summary of the Utility Model

[0005] To solve the above technical problems, the purpose of the utility model is to provide a device for multi-load cell weighing system without corner difference adjustment, which can control the asymmetry difference of the output impedance of a single load cell, eliminate the corner difference adjustment process, save time and effort, and reduce costs.

[0006] The present utility model proposes a device including a plurality of parallel group bridge plates. Each group bridge plate includes a single weighing sensor circuit board and compensation resistors. The compensation resistors include three resistors for compensating the output impedance of the weighing sensor. The three resistors are arranged in series with the output end of the single weighing sensor circuit board. Two of the three resistors are located on one side of the bridge circuit of the single weighing sensor circuit board, and the remaining one of the three resistors is located on the other side of the bridge circuit of the single weighing sensor circuit board.

[0007] Further, the three resistors are respectively a first resistor, a second resistor and a third resistor. The first resistor and the second resistor are respectively located on both sides of the bridge circuit, and the third resistor is connected in series between the first resistor and the single weighing sensor.

[0008] Further, the difference between the second resistor and the first resistor is greater than 0 and less than 1Ω.

[0009] Further, the resistance range of the third resistor is 0.1Ω - 0.9Ω.

[0010] Further, the first resistor, the second resistor and the third resistor are all E96 series resistors.

[0011] By means of the above solution, the present utility model has at least the following advantages: The device for a multi - weighing - sensor group scale system without corner - difference adjustment can control the asymmetry difference of the output impedance of a single weighing sensor to a certain extent by using the group bridge plate, and can obtain the performance of without corner - difference adjustment. The group bridge plate can realize the corner - difference - free adjustment of a group scale system at the C3 level. Thus, a large number of manual adjustment processes for the corner - difference adjustment of the group scale system are reduced, and the corner - difference adjustment process is directly eliminated, saving time, labor and cost.

[0012] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the description, the following takes the preferred embodiments of the present utility model and combines with the attached drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the group bridge plate in the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the device for a multi - weighing - sensor group scale system without corner - difference adjustment in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following combines with the attached drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but not to limit the scope of the present utility model.

[0016] Embodiment: A device for multi-load cell group scale system without corner error adjustment includes a number of parallel group bridge plates. The group bridge plate includes a single load cell circuit board 4 and compensation resistors. The compensation resistors include three resistors for compensating the output impedance of the load cell. The three resistors are serially arranged with the output end of the single load cell circuit board. Two of the three resistors are on one side of the bridge circuit of the single load cell circuit board, and the remaining one of the three resistors is on the other side of the bridge circuit of the single load cell circuit board.

[0017] Further, the three resistors are respectively a first resistor 1, a second resistor 2, and a third resistor 3. The first resistor and the second resistor are respectively on both sides of the bridge circuit, and the third resistor is serially connected between the first resistor and the single load cell.

[0018] The difference between the second resistor and the first resistor is greater than 0 and less than 1Ω.

[0019] The resistance range of the third resistor is 0.1Ω - 0.9Ω.

[0020] The first resistor, the second resistor, and the third resistor are all E96 series resistors.

[0021] The principle of the device for multi-load cell group scale system without corner error adjustment is as follows:

[0022] During the production process, the inconsistency between the ratio E / R of the output sensitivity and the output impedance of a single load cell will affect the corner error of the group scale. At the same time, the asymmetry of the output impedance of a single load cell will also affect the corner error of the group scale.

[0023] During production, considering operability, by controlling the ratio E / R of the output sensitivity and the output impedance of a single load cell and simultaneously controlling the resistance asymmetry difference of each load cell, a small corner error can be obtained. When the resistance asymmetry difference of each load cell is controlled to a certain extent, the performance of corner error-free adjustment can be achieved.

[0024] At the same time, on each compensation station of the sensors on the production line, for the same series of load cells, first, the ratio E / R of the output sensitivity and the output impedance of a single load cell needs to be compensated so that the ratio E / R is within the allowable range. Second, modify the resistance compensation program of the production line so that the difference between the second and the first resistors on both sides of the bridge circuit is controlled to be greater than 0 and less than 1Ω, and ensure that the range of the third resistor is 0.1Ω - 0.9Ω.

[0025] After using this group bridge plate and updating the compensation program, through the force unit scale test and the multi-load cell group scale test, this group bridge plate can achieve corner error-free adjustment of the group scale system at the C3 level. Thus, a large number of manual adjustment processes for the corner error of the group scale system can be reduced, and the corner error adjustment process can be directly eliminated, saving time, labor, and cost.

[0026] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A device for adjusting the angle difference of a multi-weighing sensor group scale system, characterized in that: It comprises a plurality of parallel group bridge boards, wherein the group bridge boards comprises a single weighing sensor circuit board and compensation resistors, wherein the compensation resistors comprise three resistors for compensating the output impedance of the weighing sensor, wherein the three resistors are arranged in series with the output end of the single weighing sensor circuit board, two of the three resistors are located on one side of the bridge circuit of the single weighing sensor circuit board, and the remaining one of the three resistors is located on the other side of the bridge circuit of the single weighing sensor circuit board.

2. The device for adjusting the angle difference of a multi-weighing sensor group scale system according to claim 1, characterized in that: The three resistors are respectively a first resistor, a second resistor and a third resistor. The first resistor and the second resistor are respectively located at two sides of the bridge circuit, and the third resistor is connected in series between the first resistor and a single weighing sensor.

3. The device for adjusting the angle difference of a multi-weighing sensor group scale system according to claim 2, characterized in that: A difference between the second resistor and the first resistor is greater than 0 and less than 1Ω.

4. The device for adjusting the angle difference of a multi-weighing sensor group scale system according to claim 3, characterized in that: The resistance range of the third resistor is 0.1Ω-0.9Ω.

5. The device for adjusting the angle difference of a multi-weighing sensor group scale system according to claim 4, characterized in that: The first resistor, the second resistor and the third resistor are all E96 series resistors.

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