CN1632494A - Method and device for determining position of center of gravity for container - Google Patents

Abstract

This invention is a container gravity position measurement method and its device. It adopts the method of separate weighting to read out four weigh values and inclination weight value to measure the level and height gravity centers of the container. The special device in this invention comprises rack, top hydraulic mechanism and weighting and display devices. And its rack has two layers connected through a gemel at one side, wherein, upper rack four top corners are used to contain the weighting device; the bottom rack contains the top hydraulic mechanism at crossing side of the gemel side.

Description

Measure the method and apparatus of position of center of gravity for container

[technical field]

The present invention relates to the encased conveying field, particularly a kind of method and apparatus of measuring position of center of gravity for container.

[background technology]

The navigation safety of boats and ships and goods shipment centre of gravity place are closely related, especially owing to present center of gravity to container does not have suitable method to measure, so when calculating the centre of gravity place of container ship, generally be to treat as centre of gravity place with the position of form center of container to calculate.Because thing that container is freighted is of a great variety, packaged form is different, varies in weight, and only cases by rule of thumb with the vanning personnel, is difficult to guarantee that the position of center of gravity for container after the vanning overlaps with the centre of form.Therefore, the actual center gravity of container ship is not the calculating center of gravity, often makes the boats and ships run-off the straight.For the navigation safety of boats and ships must be eliminated inclination, can only adopt Ballast Water to adjust the floading condition of ship on the ship usually.

[summary of the invention]

The objective of the invention is to provide a kind of method and apparatus of measuring position of center of gravity for container in order to overcome the deficiencies in the prior art, the method and apparatus of this mensuration position of center of gravity for container can determine the centre of gravity place of container, overlaps the condition created for the vanning that makes container can reach center of gravity with the centre of form.

The present invention is that to address the above problem the scheme that is adopted be to have invented a kind of method of measuring position of center of gravity for container.It adopts the method for weighing respectively to measure the horizontal center of gravity and the height center of gravity of vanning load-carrying:

(1) four jiaos of the bottoms of container are positioned over four independently level weigh on the fulcrum, and directly read four levels numerical value of weighing by display screen, obtain horizontal center of gravity error fiducial value;

(2) under aforementioned each level is weighed the prerequisite that numerical value equates, bottom one end of container is passed through two independently hydraulic mechanism jack-up, make 2-4 ° of container inclination, two independently the fulcrum of hydraulic mechanism be two inclinations fulcrums of weighing simultaneously, and directly read this inclination numerical value of weighing by display screen;

(3) inclination is weighed numerical value and standard center-of-gravity value relatively, obtain height center of gravity error fiducial value.

The present invention has designed a kind of isolated plant for the method for measuring position of center of gravity for container.It comprises support body, the jacking hydraulic mechanism and weigh, display device.It is upper and lower two-layer to it is characterized in that said support body is divided into, and upper and lower two-layer support body is connected through the hinge a side edge; Said upper frame is equipped with respectively at four jiaos of end faces place and is used for the weighing device of the horizontal center of gravity of mensuration, and weighing device is connected with display screen; Said lower frame is equipped with the hydraulic mechanism of jacking upper frame at the opposite side that hinge is housed, and the fulcrum of the upper frame of jacking simultaneously also is a weighing device, and weighing device also is connected with display screen.

The invention solves a difficult problem of determining position of center of gravity for container, make the vanning of container realize that center of gravity overlaps with the centre of form and become possibility, thereby can improve the reliability and the authenticity of centre of gravity place that container ship calculates greatly, provide reliable guarantee the navigation safety of container ship.The isolated plant that the present invention designs for the method for measuring position of center of gravity for container, it is simple in structure, and is easy to use, and movability is good, the influence of the place environment of not cased; Can in vanning, determine the position of case center of gravity, so that in time adjust; In addition, can accomplish that also the container of each shipment not only has weight marking, also have the sign of centre of gravity place.

Be described in detail with reference to accompanying drawing below with reference to embodiments of the invention.

[description of drawings]

Fig. 1 measures the device flat condition synoptic diagram of position of center of gravity for container;

Fig. 2 measures the device jack-up view of position of center of gravity for container.

[embodiment]

The present invention measures the method for position of center of gravity for container, adopts and weighs respectively and Calculation Method.

At first measure the horizontal center of gravity of vanning load-carrying, with four jiaos of the bottoms of container be positioned over four independently level weigh on the fulcrum, and directly read each level numerical value of weighing by display screen, obtain horizontal center of gravity error fiducial value.When center of gravity was positioned at horizontal central point and is the centre of form, then the each point numerical value of weighing was same value.When the numerical value of weighing when each point is unequal, the weight that four levels are weighed and born on the fulcrum is described, promptly goods is inhomogeneous along the chest plane distribution in the case.The position that just needs goods in the adjusting tank in this case, the data on four fulcrums of weighing equate.

Under horizontal center of gravity and condition that the horizontal centre of form overlaps, begin to measure the height center of gravity of vanning.Bottom one end of container is lifted, make 2-4 ° of container inclination, for example tilt angle alpha is 3 °, two independently the fulcrum of hydraulic mechanism be two inclinations fulcrums of weighing simultaneously, and directly read by display screen and to tilt to weigh numerical value.

At last, inclination is weighed numerical value and standard center-of-gravity value relatively, can obtain height center of gravity error fiducial value.

Container Height standard center-of-gravity value F calculates by following formula:

$\mathrm{\&Sigma;}{M}_o=0,W_x(\frac{h}{2}+b)-W_y\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+2\mathrm{FL}\cos \mathrm{\&alpha;}-Q_y\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+Q_x\frac{b}{2}=0---\left(1\right)$

In the formula: W _x---be that Container Weight is along the axial component of x, W _x=Wsin α

W _y---be that Container Weight is along the axial component of y, W _y=Wcos α

F---be the weight of a piston rod of lower floor's steelframe to the jack-up of upper strata steelframe

Q _x---the weight Q that is the upper strata steelframe is at the axial component of x, Q _x=Qsin α

Q _y---the weight Q that is the upper strata steelframe is at the axial component of y, Q _y=Qcos α

L---be the length of container

H---be the height of container

B---be the height of upper strata steelframe

With (1) formula in the above various substitution,

$W\sin \mathrm{\&alpha;}(\frac{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">h</figure-callout>}}{2}+b)-W\cos \mathrm{\&alpha;}\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+2\mathrm{FL}\cos \mathrm{\&alpha;}-Q\cos \mathrm{\&alpha;}\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+Q\sin \mathrm{\&alpha;}\frac{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">b</figure-callout>}}{2}=0$

So: container

Height standard center-of-gravity value F, for

$F=\frac{W}{4}-\frac{W\tan \mathrm{\&alpha;}}{L}(\frac{\mathrm{<figure-callout\; id="4"\; label="h"\; filenames="A20041009410600071.png"\; state="\{\{state\}\}">h</figure-callout>}}{4}+\frac{b}{2})+\frac{Q}{4}-\frac{\mathrm{Qb}}{4L}\tan \mathrm{\&alpha;}---\left(2\right)$

(2) formula is for calculating the heavy W of different casees, and center of gravity is positioned at The time lower floor support body jack-up Weight Calculation formula.If calculating center of gravity is positioned at Or other in when height lower floor's support body jack-up weight, can with Or other height value substitution (1) formula calculating gets final product.

Be example with the 20ft container below, the form by form provides result of calculation.

The explanation of data in the table: when the total weight of container is 16t,, illustrate that the height height of C.G. of container is if the shown weight (numerical value of weighing) of display screen is 4.861t

If the shown weight of display screen is 4.833t, illustrate that the height height of C.G. of container is If the shown weight of display screen is 4.889t, illustrate that the height height of C.G. of container is

If the shown weight of display screen is a certain numeral between the 4.833t-4.861t, illustrate that the height height of C.G. of container exists Between.The meaning of other data is identical therewith in the table.

Because the height height of C.G. of container will overlap with the centre of form height of container, the height height of C.G. of container must equal so So the numeric data of weighing that display screen is shown must be in the table

Data in the hurdle.If data presented is not the data on this hurdle, illustrate that the height height of C.G. of container is not equal to

According to the data in the table relatively judge center of gravity be by on or by down, can finally make center of gravity and centre of form coincidence by adjusting the weight goods up and down at last.

Utilize the inventive method when empty container begins to freight, just to adorn on one side, Yi Bian carry out weight supervision and adjustment, thus goods is along even center of gravity of chest plane distribution and centre of form coincidence in the guard box, and be that height center of gravity mensuration lays the first stone.

In order to realize the method for said determination container 1 centre of gravity place, the present invention has designed a kind of isolated plant.It is by support body, the jacking hydraulic mechanism and weigh, composition such as display device.Its support body is divided into upper and lower two-layer, and upper and lower two-layer support body connects by hinge 6 a side edge.Wherein: upper frame 3 is used for measuring the horizontal center of gravity of vanning load-carrying, and it is equipped with weighing device 2 respectively at four jiaos of places of end face, and the weighing device display screen 5 preceding with being arranged on upper frame is connected; Lower frame 4 is used for measuring the height center of gravity of vanning load-carrying, on one side it is the hydraulic mechanism that the jacking upper frame is housed at the offside of the side that hinge is housed; Simultaneously the fulcrum of jacking upper frame also is a weighing device, and weighing device also be arranged on lower frame before display screen be connected.

Laying respectively at the weighing device on the upper and lower two-layer support body, can be device or other pressure sensor device that pressure that liquid is transmitted changes electronic digit into.

As shown in Figure 2, the hydraulic mechanism of the jacking upper frame of isolated plant of the present invention is a fluid pressure gearing 7 respectively to be housed as piston rod in two bights.

Claims (5)

1 one kinds of methods of measuring position of center of gravity for container is characterized in that horizontal center of gravity and height center of gravity with the method mensuration vanning load-carrying of weighing respectively:

(1) four jiaos of the bottoms of container are positioned over four independently level weigh on the fulcrum, and directly read four levels numerical value of weighing by display screen, obtain horizontal center of gravity error fiducial value;

(2) under aforementioned each level is weighed the prerequisite that numerical value equates, bottom one end of container is passed through two independently hydraulic mechanism jack-up, make 2-4 ° of container inclination, two independently the fulcrum of hydraulic mechanism be two inclinations fulcrums of weighing simultaneously, and directly read this inclination numerical value of weighing by display screen;

(3) inclination is weighed numerical value and standard center-of-gravity value relatively, obtain height center of gravity error fiducial value.

2 in accordance with the method for claim 1, and the tilt angle alpha that it is characterized in that said container is 3 °.

3 one kinds of devices that are exclusively used in the method for measuring position of center of gravity for container comprise support body, the jacking hydraulic mechanism and weigh, display device, it is upper and lower two-layer to it is characterized in that said support body is divided into, upper and lower two-layer support body is connected through the hinge a side edge; Said upper frame is equipped with respectively at four jiaos of end faces place and is used for the weighing device of the horizontal center of gravity of mensuration, and weighing device is connected with display screen; Said lower frame is equipped with the hydraulic mechanism of jacking upper frame at the opposite side that hinge is housed, and the fulcrum of the upper frame of jacking simultaneously also is a weighing device, and weighing device also is connected with display screen.

4 according to the described device of claim 3, it is characterized in that said weighing device is the device that pressure that liquid is transmitted changes electronic digit into.

5 according to claim 3 or 4 described devices, it is characterized in that the hydraulic mechanism of said jacking upper frame respectively is equipped with a fluid pressure gearing in two bights.

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