Error in the actual use of road scales - Database & Sql Blog Articles

Test - lowercase jpg

Kaixin micro test

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

inductance

Error of road weighbridge in actual use

The weighing result of each axis in 1 is less than the actual weight, so the vehicle weight will be less than the actual weight.

When the wheel enters the weighing platform, the weighing platform will be deformed, which will affect the relative height of the weighing platform and the road surface, and will also bring weighing error.

C. Changes in the speed of the vehicle and changes in the smoothness of the road surface will result in no load on the axles of the vehicle (especially liquid tankers).

Breaking changes, for example, when the vehicle accelerates, the front axle weight will be reduced, and the rear axle weight will increase; conversely, when the vehicle decelerates, the front axle weight will increase, and the rear axle weight will decrease, and some drivers use this to cheat. And we are using a constant scale to weigh a changing wheel, so it will definitely produce errors, which will bring opportunities for some people who are good at cheating.

1.2 Error analysis of curved plate weighing equipment

The curved plate weighing device is the same as the weighing platform axle load meter. It also weighs the weight of each axle of the vehicle separately, and then accumulates the meter to obtain the total weight of the vehicle. Therefore, the disadvantages of the platform weight gauge are available. In addition, its table top is shorter, usually only 350mm ~ 500mm, so the sampling time is shorter, the error is greater.

1.3 Weighing principle and error analysis of quartz weighing equipment

Quartz weighing equipment is also a shaft weight weighing equipment. Quartz weighing equipment is based on the principle that a piezoelectric quartz crystal generates a charge (piezoelectric effect) on its surface when subjected to a varying load. It requires that the load must be changed,

In other words, when the vehicle is stationary on it, there is no signal output and it cannot be weighed. The strength of the piezoelectric quartz output signal is related to the magnitude of the load, in addition to the magnitude of the load change. At the same time, because the quartz sensor is narrow (generally only 50mm to 60mm), the contact length between the tire and the ground is usually 200mm~ 300mm, so the quartz weighing equipment is part of the weighing of the wheel, so the speed of the vehicle and the fullness of the tire inflation will affect the weighing result. The weighing result of this kind of equipment has the largest error. The figure below shows the effect of the fullness of the tire inflation on the sensor load. Similarly, for shafts with the same weight, when the tire diameter is different, the load distribution and load peak value will be different, which will affect the weighing result.

1.4 The weighing accuracy of the whole vehicle weighing equipment is high

The weighing platform of the vehicle-type weighing equipment has sufficient length to weigh the entire vehicle at a time, so it completely eliminates the influence of the shaft measurement error, and various methods of cheating are difficult to work, and because the table is long, the data More sampling, so the weighing accuracy is very high.

1.5 axis group weighing dynamic truck scale weighing process

The axle group weighing type dynamic truck scale can weigh the vehicle section. Figure 4 shows the weighing process of the six-axis weighing machine. Figure 3 shows the first three axles first, then the latter. The three shafts are weighed once, and the weight of the two sections is added to obtain the weight of the whole vehicle. Since the first three axes (or the last three axes) are weighed once, and because the weighing table is relatively long, the sampling data is sufficient, so it can be called very accurate, so the obtained vehicle weight is also very accurate. . Its weighing accuracy can basically reach the accuracy of the whole vehicle weighing equipment.

Analysis of the weighing method and error of 1.6 scale bench axle load detector

The scale table axle loader weighs the weight of each axle of the vehicle passing through the weighing platform, and then accumulates the meter to obtain the total weight of the vehicle. The reasons for this error in the weighing method are mainly the following:

A, the weighing platform is too short, usually between 700mm ~ 1000mm, so the sampling time is short, so it will produce weighing error;

B. There is a difference in height between the installation of the weighing platform and the road surface, as shown in the following figure:

In Figure 1, the weighing weight of each axle of the vehicle is higher than the actual weight, so the overall vehicle weight will be greater than the actual weight. And the figure

Our professional production and sales:

Electronic platform scale

,

Electronic truck scale

,

Cylinder scale

,

Forklift scale

,

Wheelchair scale

,

Roller scale

(Welcome to the company website:

Http://

)