阅读说明：本技术 一种基于应变计的货箱内货物称重方法 (Strain gauge-based method for weighing goods in container ) 是由 丘书凡 吕就敏 于 2021-09-06 设计创作，主要内容包括：本发明公开提供一种基于应变计的货箱内货物称重方法,包括：建立形变量与重量对应的数据库；将货箱平均分为n个区域,通过货箱底部横梁上的应变计获取当前货箱的形变输出量S-(m),查找数据库得到当前形变输出量S-(m)对应的货物重量W-(m)；根据所述货物重量W-(m)计算得到货箱内货物重量：根据应变计和车厢结构特性,将应变计的形变输出量计算成货物实际重量,实现了高精度称重的目的；相比于现有地磅称重,能随时获得货箱内货物重量,为物流运输提供方便。(The invention discloses a method for weighing goods in a container based on a strain gauge, which comprises the following steps: establishing a database with deformation quantity and weight corresponding to each other; the container is averagely divided into n areas, and the deformation output quantity S of the current container is obtained through a strain gauge on a beam at the bottom of the container m Searching the database to obtain the current deformation output quantity S m Corresponding cargo weight W m (ii) a According to the weight W of the goods m Calculating to obtain the weight of the goods in the container: according to the structural characteristics of the strain gauge and the carriage, the deformation output quantity of the strain gauge is calculated into the actual weight of the goods, so that the aim of high-precision weighing is fulfilled; compare and weigh in current weighbridge, can obtain goods weight in the packing box at any time, provide convenience for the commodity circulation transportation.)

1. A method for weighing goods in a container based on a strain gauge is characterized by comprising the following steps:

establishing a database with deformation quantity and weight corresponding to each other;

the container is averagely divided into n areas, and the deformation output quantity S of the current container is obtained through a strain gauge on a beam at the bottom of the container_mSearching the database to obtain the current deformation output quantity S_mCorresponding cargo weight W_m；

According to the weight W of the goods_mCalculating to obtain the weight of the goods in the container:

in the above formula, the first and second carbon atoms are,the deformation output quantity when the goods are fully loaded.

2. The method for weighing goods in the cargo box based on the strain gauges as claimed in claim 1, wherein the strain gauges comprise four strain gauges which are respectively arranged at four corners of a beam at the bottom of the cargo box.

3. The method for weighing goods in the container based on the strain gauges as claimed in claim 1, wherein a corresponding database of deformation quantity and weight is established according to the characteristics of different deformation quantities S corresponding to different weight goods.

Technical Field

The invention relates to the technical field of weighing methods, in particular to a method for weighing goods in a container based on a strain gauge.

Background

Conventionally, the wagon balance has been used for weighing. The cargo of a truck is generally weighed by a wagon balance. But the wagon balance can only indicate the condition of the cargo on the wagon balance, which is undoubtedly a constraint. This mode of weighing can't acquire goods weight in real time, can not realize the goods control to the freight train.

Disclosure of Invention

The embodiment of the disclosure provides a method for weighing goods in a container based on a strain gauge, which solves the existing problem. The technical scheme is as follows:

according to a first aspect of the disclosed embodiments, there is provided a method for weighing goods in a container based on a strain gauge, including:

establishing a database with deformation quantity and weight corresponding to each other;

the container is averagely divided into n areas, and the deformation output quantity S of the current container is obtained through a strain gauge on a beam at the bottom of the container_mSearching the database to obtain the current deformation output quantity S_mCorresponding cargo weight W_m；

According to the weight W of the goods_mCalculating to obtain the weight of the goods in the container:

in the above formula, the first and second carbon atoms are,the deformation output quantity when the goods are fully loaded.

In one embodiment, the strain gauges include four strain gauges mounted at each of the four corners of the bottom beam of the cargo box.

In one embodiment, a corresponding database of deformation quantity and weight is established according to the characteristics of different deformation quantities S corresponding to different weight cargos.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a flow chart of a method for weighing goods in a container based on a strain gauge according to an embodiment of the disclosure;

FIG. 2 is a strain gauge distribution diagram of a method for weighing cargo in a cargo box based on strain gauges according to an embodiment of the disclosure;

FIG. 3 is a box area segmentation diagram of a method for weighing goods in a container based on a strain gauge in an actual state according to an embodiment of the disclosure;

fig. 4 is an ideal state container area segmentation diagram of a method for weighing goods in a container based on a strain gauge according to an embodiment of the disclosure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Example 1

As shown in fig. 1, a method for weighing goods in a container based on a strain gauge as shown in fig. 1 comprises the following steps:

step S101, as shown in figure 2, strain gauges are respectively installed at four corners of a beam at the bottom of the cargo compartment and used for measuring deformation of the beam at the bottom of the cargo compartment;

step S102, carrying out experiments in advance, and establishing a database corresponding to deformation quantity and weight according to the characteristics of correspondingly outputting different deformation quantities S of goods W with different weights;

step S103, as shown in FIG. 3, the container is divided into n regions, denoted as A₁……A_nObtaining the deformation output quantity S of the current container_mSearching the database to obtain the current deformation output quantity S_mCorresponding cargo weight W_m；

According to the weight W of the goods_mCalculating to obtain the weight of the goods in the container:

in the above formula, the first and second carbon atoms are,the deformation output quantity when the goods are fully loaded.

The derivation process of equation (3) is as follows:

in a rectangular parallelepiped container, the length and width are known, so the height of the cargo reflects the volume of the area. The cargo height of each zone also reflects the amount of weight in that zone. Note that the cargo volume in region a1 is V1, and so on, then the cargo volume in region An is Vn.

From experimental data, when the cargo volume in the cargo box is V1, the deformation output is recorded as S1, when the cargo volume in the cargo box is V1+ V2+ V3, the deformation output is recorded as S2, when the cargo volume in the cargo box is V1+ V2+ V3+ V4+ V5, the deformation output is recorded as S3, and so on, the following can be obtained:

when the goods are fully loaded, the deformation output quantityAs measured by strain gauges. The cargo volume V1+ V2+ V3+ V4+ V5 in the cargo box can be calculated according to formula (2):

since ρ is m/v, the volume is divided by the density at the same time, and the weight of the cargo in the cargo box, that is, the formula (1), is obtained.

In this embodiment, the error rate is obtained by comparing the data obtained by measuring V with the volume V of the goods in the container calculated by using the formula, as shown in the following table:

as can be seen from the above table, the error rate between the theoretical calculation and the actual weighing of the actual calculation method is 3.04%. The error comprises a measurement error of the strain gauge, the nominal error of the strain gauge used in the experiment is 1%, and under the condition of selecting the high-precision strain gauge, the error can be reduced, and more accurate weighing is achieved.

Example 2

In the embodiment, the weighing method of the goods in the container in the ideal state (the goods are uniformly distributed) is given

In step S201, as shown in fig. 4, an area a1 is defined at the center of the cargo box, and the area a is defined₁Placing standard weights, recording the weight of the goods in the container as W1, and recording the corresponding deformation output as S1;

step S202, setting the area A₁The two sides are divided into regions with the same area, which are respectively marked as regions A2, and the regions A2 are respectively arranged on the two regions A2₁The same standard weight, when the cargo weight of the cargo box is recorded as W2, W2kg is 3W1, and the corresponding deformation output quantity is recorded as S2;

step S203, by analogy, dividing the container into areas with the same area of 2n +1, recording the weight of the container as Wn, (2n +1) W1, and recording the corresponding deformation output quantity as Sn;

according to experimental measurement, if Wn is (2n +1) W1, Sn is (2n +1) S1;

step S204, when the goods are fully loaded, the deformation quantity is Sn through the measurement of the strain gauge, and the deformation quantity is calculated according to the formula

Given that S1 is the deformation output of the standard weight corresponding to W1kg, various mappings can be formed by using different types of weights. And correspondingly outputting different deformation quantities according to weights with different weights, and establishing a database table. By table lookup, the deformation output Sm ═ 2m +1) S1 can be converted into the cargo weight Wm, and the cargo weight W in the entire cargo box can be calculated as (2m +1) Wmkg.

In this embodiment, the a1 parameter is used as the original data of the table, and the relationship corresponding to Sn is as follows:

through checking calculation, the error rate between the actual method and the calculation method is 3.04%, the nominal error of the strain gauge used in the experiment is 1% due to the measurement error of the strain gauge, and under the condition of selecting the high-precision strain gauge, the error can be reduced, and more accurate weighing can be achieved.

According to the method for weighing the goods in the container based on the strain gauge, disclosed by the invention, the deformation output quantity of the strain gauge is calculated into the actual weight of the goods according to the structural characteristics of the strain gauge and the carriage, so that the purpose of high-precision weighing is realized; compare and weigh in current weighbridge, can obtain goods weight in the packing box at any time, provide convenience for the commodity circulation transportation.

In this example, other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.