A Quality Characteristic Measurement System Based on Four-Point Method

Abstract

The invention relates to a mass characteristic measuring system adopting a four-point method. The mass characteristic measuring system comprises a base, a horizontal moving structure, a weighing structure, an elevating structure, and a control structure. The horizontal moving structure comprises two parallel slide rails arranged along the length direction of the base and a slide block disposed on the parallel slide rail. The weighing structure comprises a left side part disposed on the slide block and the right side part disposed on the base. The left side part and the right side part have the same structure, and each of the left side part and the right side part comprises a V-shaped supporting block and two weighing sensors disposed on the two inside inclined surfaces of the V-shaped supporting block. The elevating structure comprises the left side part disposed on the slide block and the right side part disposed on the base, and each of the left side part and the right side part comprises an auxiliary supporting block and a servo motor used to drive the elevating of the auxiliary supporting block. The control structure comprises an industrial control computer, which is connected with the servo motors and the right weighing sensors. The mass characteristic measuring system is used to measure the mass, the center of mass, and the deviation of mass, a measured object is directly contacted with the weighing sensors, and therefore weighing precision is high.

Description

technical field [0001] The invention relates to the technical field of object quality characteristic measurement, in particular to a quality characteristic measurement system. Background technique [0002] The three-point support method (referred to as the three-point method) is an algorithm of the gravimetric response method. Through three load cells, the measurement of the mass and center of mass parameters of the measured object is completed according to the principle of moment balance. Its calculation process is as follows. [0003] Quality measurement generally adopts the principle of static weighing. The weighing platform is designed as a rigid whole. The weighing sensor is arranged under the platform according to certain rules. The measured object is fixed on the platform. After the system is stable, the indication value of the weighing sensor Summing and then subtracting the self-weight of the platform, the weight of the measured object is obtained. Three sets of l...

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Problems solved by technology

[0022] 2. When the three-point method measures the height of the center of mass, the mechanism is relatively complicated, and two moving drives need to be applied, and synchronous movement is required to maintain the attitude of the worktable

However, the four-point method also has the following three deficiencies: first, in the four-point method, the X-axis and Y-axis positions of the center of mass of the V-shaped block supporting the measured object can be measured by no-load, but the Z The axial direction cannot be measured and needs to be obtained through theoretical calculation

Second, in the four-point method, the four load cells are in contact with the V-shaped support block at the same time, and the V-shaped support block is in contact with the measured object. This layout structure causes the four load cells to be coupled to each other and are not independent. It reflects the force at the contact point of the measured object and has a certain impact on the weighing accuracy

Third, the sensor will produce a certain amount of deformation after being stressed, especially when weighing large-scale measured objects, the influence of relevant deformation factors is not considered

The deformation of the load cell will lead to changes in the position and attitude of the V-shaped support block, which will have a greater impact on the weighing accuracy

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