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Weight measuring method of wheat in horizontal warehouse

A measuring method and technology of flat silo, which are applied in the direction of measuring device, weighing, weighing equipment for materials with special properties/forms, etc., which can solve the problem of large weight error of wheat

Inactive Publication Date: 2016-02-03
NANJING UNIV OF FINANCE & ECONOMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bulk density method calculates the weight of wheat by multiplying the volume of the wheat heap by the average density. The average density of the wheat heap is the surface density multiplied by the correction coefficient. Since the correction coefficient is given by experience, the granary calculated by this method Large error in wheat weight

Method used

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  • Weight measuring method of wheat in horizontal warehouse
  • Weight measuring method of wheat in horizontal warehouse
  • Weight measuring method of wheat in horizontal warehouse

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Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1 adopts the inventive method to measure wheat storage weight in the flat storehouse

[0064] Select the real warehouse provided by Nanjing Tiexinqiao National Grain Reserve to verify the accuracy of the method of the present invention. The method of measuring the weight of wheat is as follows:

[0065] (1) The length B and width A of the flat warehouse, the friction coefficient μ between the wheat and the flat warehouse wall, and the internal friction angle of the wheat pile Other parameters are shown in Table 4. The height of the grain surface is exactly the height of the wheat pile. According to the conventional method, use a vernier caliper to measure the large particle size, medium particle size, and small particle size of wheat grains, and the average value is the equivalent particle size; the equivalent particle size is used as the wheat particle size. The three particle sizes of Ningmai No. 13 are 6.28, 3.40, and 2.90 mm, and the equivalent partic...

Embodiment 2

[0079] Embodiment 2 Measuring method of the present invention compares with bulk density method

[0080] Adopt volume density method to measure the wheat in each flat storehouse among the embodiment 1. The correction coefficient of the bulk density method is 1.02, and the calculation results are shown in Table 6:

[0081] Table 6 Comparison of errors between the measured value and the actual book value

[0082]

[0083] As can be seen from Table 6, the maximum error measured by the bulk density method is 4.40%, and the average error is 3.13%; the maximum error of the measurement method of the present invention is 2.62%, and the average error is 1.77%; the measurement method of the present invention has high precision.

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Abstract

The invention provides a weight measuring method of wheat in a horizontal warehouse, and relates to the field of grain measurement. The weight measuring method of wheat in the horizontal warehouse comprises the steps of: measuring the length B and the width A of the horizontal warehouse, the height H of a wheat pile in the horizontal warehouse, a friction coefficient [mu] between wheat and a horizontal warehouse wall, a friction angle [phi] in the wheat pile, a wheat water content MC and a wheat particle size d; carrying out laying in the depth direction of the wheat pile in the horizontal warehouse with the layer height being 20-100 times of the wheat particle size; establishing a relation model at the depth z in the horizontal warehouse among a wheat layer density [rho], a vertical pressure stress p and the wheat water content MC; establishing force equilibrium equations of the wheat layer at the depth z; and forming a simultaneous equation set, solving the simultaneous equation set, obtaining the density [rho] of each wheat layer, and taking the density [rho] of each wheat layer into a formula shown in the specification, and obtaining the weight of wheat in the horizontal warehouse. The measuring method is simple, short in time consumption, accurate in measurement result and high in precision.

Description

technical field [0001] The invention relates to the field of grain measurement, in particular to a method for measuring the weight of wheat in flat warehouses. Background technique [0002] The flat warehouse is the main granary for storing wheat. Wheat is stored in a bungalow, which will be supported by its own weight, internal friction, and the walls and bottom of the warehouse. The interior of the wheat pile produces stress due to the action of these forces, resulting in elastic and plastic deformation. The volume of the wheat pile shrinks and the density increases. With the increase of the depth of the grain layer, the density of the wheat increases. At present, the grain storage weight inspection method in my country is the bulk density method (Ren Zhengxiao. Grain inventory inspection practice [M]. Beijing: China Commercial Publishing House, 2007: 15-17.). The bulk density method calculates the weight of wheat by multiplying the volume of the wheat heap by the averag...

Claims

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Application Information

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IPC IPC(8): G01G17/04
Inventor 程绪铎杜小翠高梦瑶冯家畅陆琳琳
Owner NANJING UNIV OF FINANCE & ECONOMICS
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