Rider-type solid-density measuring instrument

Abstract

The invention relates a rider-type solid-density measuring instrument which converts solid density measurement to length measurement, and achieves length measurement, data processing and data display by utilization of an electronic digital display vernier. According to the measuring instrument, a rider that is the electronic digital display vernier is disposed on a lever. The lever is balanced by adjusting the position of the rider on the lever. Then a solid to be measured is hung on one side of the level, and at the same time the rider is moved a distance (L[2]) to balance the level a second time. Then the solid is immersed in water, and at the same time the rider is moved a distance (L[3]) to balance the level a third time. The two distances of the rider are measured and a ratio (L[2] / L[3]) is calculated by utilization of the electronic digital display vernier; and the ratio is displayed in an electron screen as the density, in a unit of g / cm<3>, of the solid to be measured. The measuring instrument is mainly used for directly measuring the solid density, and the density of the solid to be measured can be directly read out on the electron screen.

Description

technical field [0001] The invention relates to a measuring instrument for measuring solid density. Background technique [0002] Let the volume be The mass of an object is , then the density of the object equal . [0003] At present, people have been able to measure the density value of liquid or gas very accurately. For solids with regular shapes, density detection is relatively easy to realize. However, it is still a difficult problem to measure the density of solids with irregular shapes. [0004] Many methods known in the past to measure the density of solids are indirect measurement methods, that is to say, the density value of the measured solid should be calculated from several directly measured quantities through known functional relationships, and some of these methods The measured solid density value is very inaccurate, and some of the methods need to perform cumbersome operation steps during the measurement process. Here are two typical methods for indir...

AI Technical Summary

Problems solved by technology

[0014]③ During the use of electronic scales, the stress on the weighing sensor is complicated, and after a period of use, the contact points of the sensor will eventually change, causing the The original state during verification changes, resulting in zero drift, resulting in weighing errors;

[0015]④ The friction or leaning between the weighing platform and the shell of the electronic scale will affect the transmission of force, so that the weight when loading the load cannot fully act on the load cell In general, the output signal of the load cell is naturally small. In such cases, the small weighing is basically normal. After increasing the load, the displayed value decreases significantly;

[0016]⑤ The friction and stress in the mechanical connection between the weighing platform and the gravity sensor of the electronic scale will cause the discrimination error of the electronic scale;

[0017]⑥ If the power supply of the electronic scale is unstable, or the power supply voltage is too low, it will also affect the inaccurate weighing of the electronic scale;

[0018]⑦ The electronic scale must be re-calibrated every once in a while. If the calibration is not performed in time, the electronic scale will also have a large weighing error;

[0019]⑧ If the electronic scale is impacted during transportation, the sensor will be damaged due to excessive external force, or there will be heavy objects on the weighing platform for a long time, which will cause the sensor to be damaged to a certain extent. Degree of damage will also cause inaccurate weighing of electronic scales

[0024]1. If the weighing sensor of the electronic balance is used inside the desktop scale density meter, although the measurement accuracy is high, the weighing range is very limited, that is, it cannot be used for Measure the density of solids whose mass exceeds 0.2kg, and the manufacturing cost of this table scale density meter is very expensive, the requirements for the use environment are high, and the operation rules are complicated;

[0025]2. If the load cell of the electronic scale is used inside the desktop scale density meter, although the weighing range of the electronic scale is relatively large, it can measure solids with a large mass Density, but due to the large weighing error of the electronic scale, the error of the solid density value finally measured by this table scale density meter will be relatively large, the smaller the volume of the solid to be measured, the greater the measurement error

At present, some desktop scale density meters can display the density value of the solid to be tested on the electronic screen with a resolution of 0.0001g / cm3, but the accuracy of the measurement results is far from accurate. It cannot reach 0.0001g / cm3, here is an example: If we use a table scale density meter to measure the density of a pin with an actual density of about 7.85 g / cm3 Density, the measurement result shows a value of 7.7926 g / cm3, obviously, the third digit of the density value obtained from the measurement result is not accurate, those displayed after the third digit numbers mean nothing

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