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Linear compensation method for electronic belt scale

An electronic belt scale, linear compensation technology, applied in measuring devices, instruments, weighing and other directions, can solve the problems of poor weighing accuracy, high operating cost and high investment, achieve convenient linear compensation, ensure weighing accuracy, overcome the system Effects of Linearity Error

Inactive Publication Date: 2014-12-03
SAIMO ELECTRIC
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Problems solved by technology

The tension of the belt and the softness of the belt directly affect the weighing results, because the belt tension on each belt conveyor and the hardness of the belt itself are different, especially from low flow to large flow or from large flow Belt tension and belt hardness also change accordingly when conveying materials to low flow materials, these factors will affect the weighing accuracy when the flow of conveyed materials changes greatly
The current technology to solve this problem is to perform corresponding material calibration at multiple points of 80%, 60%, and 40% of the maximum material flow rate between the maximum material flow rate and the minimum material flow rate. Due to the multi-point material calibration on site Not only the investment is high, but also the implementation is cumbersome and the operating cost is high, which results in poor weighing accuracy when the flow rate of the conveyed material changes greatly, and it is not easy to find

Method used

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Embodiment example

[0035] Test conditions: belt width: 1000mm; belt speed: 2.0m / s; maximum material flow rate of the belt conveyor: M = 1000t / h.

[0036] Step 1: During material calibration of the belt scale, the weighing instrument 5 calculates and records:

[0037] Number of belt scale range calibrations after material calibration: E=8795021;

[0038] The force value of weighing scale frame 1 before measurement: a=98t;

[0039] After measuring, weigh the force value of the scale frame 2: b=100t;

[0040] Force error: A=(b-a) / b=(100-98) / 100=0.02;

[0041] The measurement accuracy of the belt scale material after calibration is: ±0.5%.

[0042] Step 2: When the belt scale is running normally and the zero point is adjusted, in the empty belt state, the weighing instrument 5 calculates and records:

[0043] The force value of weighing scale frame 1 before measurement: c=1.3t;

[0044] The force value of weighing scale frame 2 after measurement: d=1.5t;

[0045] Force error: B=(d-c) / d=(1.5-1....

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Abstract

The invention discloses a linear compensation method for an electronic belt scale. Two sets of independent weighing scale frames installed on a belt conveyor are used to measure load-bearing errors of a belt conveyor under a maximum conveyance material flow condition and a no-load condition and through calculation of the difference of the load-bearing errors under the two kinds of conditions, a correction error is obtained; and the correction error is used to carry out linear compensation correction on a measurement-range correction number of the belt scale so that the belt scale is capable of overcoming system linear errors brought by tension change and hardness change of a conveyance belt in a whole weighing range and thus an accurate measurement value is obtained. The method is capable of timely, simply and conveniently realizing linear compensation under a condition that normal use of the belt scale is not affected when a conveyance material flow changes so that weighing precision when the conveyance material flow changes is ensured.

Description

technical field [0001] The invention relates to a linear compensation method for an electronic belt scale, belonging to the technical field of dynamic weighing. Background technique [0002] The weighing working principle of the electronic belt scale is that when the belt conveyor continuously transports materials, they will be weighed after passing through the belt. The tension of the belt and the softness of the belt directly affect the weighing results, because the belt tension on each belt conveyor and the hardness of the belt itself are different, especially from low flow to large flow or from large flow The belt tension and the hardness of the belt also change accordingly when conveying materials to low-flow conveying materials. These factors will affect the weighing accuracy when the conveying material flow changes greatly. The current technology to solve this problem is to perform corresponding material calibration at multiple points of 80%, 60%, and 40% of the maxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G23/01G01G11/00
Inventor 厉达刘志良何福胜张兴国
Owner SAIMO ELECTRIC
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