Fruit hardness detection method and special electronic fruit hardness tester

Abstract

The invention relates to a fruit hardness detection method and a special electronic fruit hardness tester. Firstly, a system is automatically reset and a weighing sensor is calibrated; afterwards, a stepping motor or a servo motor drives a measuring pressure head to descend at a uniform speed, and when the measuring pressure head is contact with a fruit, the weighing sensor senses an incremental signal and transmits the signal to a microprocessor; at the time, the microprocessor begins to calculate the insertion depth and records pressure data obtained every time the measuring pressure head steps forward; the microprocessor or a computer divides the pressure data by a cross sectional area to obtain a series of hardness values of different depths, and the maximum value is taken as the fruit hardness value to be displayed. Through changing the detection method, the accuracy and consistency of hardness detection results are guaranteed.

Description

[0001] technical field [0002] The invention relates to a method and an instrument for detecting fruit hardness, in particular to a method for detecting fruit hardness and an electronic fruit hardness meter for implementing the method. Background technique [0003] Fruit firmness is an important index to measure fruit maturity. In addition, in the fruit preservation industry, it is often necessary to measure the hardness of the fruit, so as to reflect the preservation effect of the fruit in the fresh-keeping warehouse, and serve as the basis for calculating the fresh-keeping time after leaving the warehouse. [0004] Fruit hardness of apples, pears and other fruits: it is the pressure (N) per unit area (S) of the fruit, and their ratio is defined as fruit hardness (P): P=N / S, P represents the hardness value of the tested fruit, in Pa , kPa or kg / cm 2 express. N represents the force pressed on the fruit surface, and S represents the force-bearing area of ​​the fruit. The...

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Problems solved by technology

For the change of elasticity and friction after use, it is very difficult for the user to calibrate, and it is almost impossible to achieve calibration

[0007] Second, the operator has too much influence

When measuring the hardness of fruit, the measuring head is inserted into the fruit by hand, because it is difficult for human hands to ensure that the strength is uniform and the direction is vertically inserted to the specified depth, and the operating strength and operating habits of different people are different, human factors are greatly increased, and the measurement results are often subjectivity, great differences, prone to disputes

[0008] Third, the distribution curves of the hardness values ​​at different depths of the fruit cannot be obtained

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