JPS5872032A - Digital rubber hardness tester - Google Patents

Abstract

PURPOSE:To obviate the generation of human errors in reading of the pointer which fluctuates during measurement by reading and displaying peak hardness values or the hardness value after specified time automatically. CONSTITUTION:In a step ST8, whether the testing method initialized in a step ST2 is measurement for peak hardness or measurement for hardness after specified time is judged and in the case of the program of the measurement for peak hardness, the step is advanced to a step ST9. In the case of the measurement for hardness after specified time, the step is advanced to a step ST13. In the step ST9, a lamp is turned on and in a step ST10, an instruction for starting releasing of pressure is transmitted to a sliding driver of the testing device. In a step ST11, whether the reversibly counted value is lower than a threshold value (h) or not is judged and when the value is judged to be lower than said value, the peak value 23 taken into the step ST7 is printed out in a step ST12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring-type rubber hardness tester that measures the hardness of an elastic body such as rubber, and in particular, the present invention relates to a spring-type rubber hardness tester that measures the hardness of an elastic body such as rubber. , relates to a rubber hardness meter with automatic VC reading and digital display.

Conventional spring type rubber hardness tester (J l5K630
1), the hardness is indicated by a pointer, but elastic materials, especially rubber materials, are easy to relax, and the hardness reading i
Since the indicator 11C (indication 11C) changes during IV testing, there is a drawback that individual errors are likely to occur when reading the hardness. However, the reproducibility was not good because of the instability time when the pressurizing surface of the testing machine was brought into contact with the test piece.

The object of the present invention is to provide a rubber hardness meter that eliminates the above-mentioned drawbacks, that is, individual errors in hardness reading, and that can measure hardness (1 u) with good reproducibility after one ejaculation for a certain period of time.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. 11 microcomputers, internal central control unit cPU.

Read-only memory ttoM, random access memory RAM, clock CLOCK, arithmetic unit AL
It is equipped with a keyboard 12, a printer 13, etc., and performs a series of program controls described below, such as giving control signals and command signals to hardness tester #1, to determine the peak hardness value and peak value of the object to be measured. Digitally displays the hardness value after an arbitrary time elapses after the hardness value is generated. The test piece W to be measured was placed on the reference board 5 of the testing device 10 and kept perpendicular to the indentation needle of the spring-type rubber hardness tester 2, which has a built-in rotary encoder that converts the displacement of the needle into the number of pulses. It will be done. The two spring-type rubber hardness testers are pressed against the test piece W by the weight 3 via the connector 4.

In addition, four connectors are slidably supported by slide bearings 8 provided at the top of the column 9, and have the role of keeping the spring type rubber hardness test +42 and the 1 point of the test piece W in a perpendicular relationship. Eggplant.

The second J ram 9 also has a built-in sliding drive device (not shown) that moves up and down the shaft 6 that is slidably attached to the column 9. The microcomputer 110 cooperates with the member 7 that moves the connector 4 up and down to suppress the pressure of the spring-type rubber spring 1 on the test piece W of the tester 2 by the weight 6.
Start or stop +1 by command.

FIG. 2 is a flowchart of the hardness measurement sequence by the microcomputer 11, and FIGS. 3 and 4 are characteristic diagrams of peak hardness IW measurement and fixed-time extraction hardness measurement, respectively.

In the flowchart in FIG. 2, the power switch is turned on in step ST1, the contents of the reversible counter memory are initialized in step ST2, and a command signal to start pressurization is sent to the sliding drive device fft of the test device 1. . Step S] 'In B, the number of pulses emitted by the rotary encoder built in the spring type rubber hardness tester 2 is reversibly counted by interrupt processing 2, Step 5
In step ST5, the test conditions and the threshold value 11 in FIGS. Judgment.

Then, in step ST6K, the lamp is turned off, and at the same time, the subsequent reversibly counted values become valid values, and the peak value detection program is entered in step ST7.

Peak value detection always compares the reversibly counted instantaneous value with the previous value, takes the maximum value, and detects whether the next input is less than a certain value or longer than the maximum value compared to the maximum value. If it is held unchanged, it will be input as a peak value. In step ST8, it is determined whether the test method initialized in step ST2 is peak hardness measurement or fixed time extraction hardness measurement1. If it is a peak hardness measurement program, the process proceeds to step ST9, and if fixed time extraction hardness is 11111 constant. The process proceeds to step 5Tj3. In step ST9, the lamp is turned on, and in step 5TIQ, a command to start depressurization is sent to the sliding drive device of the test apparatus 1. Step 5Ti1
Then, it is determined whether or not the reversibly counted value is less than or equal to the threshold value, and if it is determined that it is less than or equal to the above threshold value, step s is performed.
-r At 12, print out the peak 1 shift 23 taken at step ST7.

If the test method initialized in step ST2 is fixed-time extraction hardness measurement, the process proceeds from step ST8 to step 5Tj3, and in steps S'1-j3, time is measured separately from the time when peak 1 shift 23 is detected in step ST7. The time shown in FIG. 4 is compared with Time , read the reversible H1 number 11'+27 at that point, step 5T
The lamp is turned on at i5, and 1 at step 5T10.
A command to start depressurization is sent to the sliding drive device of the substitute device η1. In step 5T11, the reversibly counted value is
It is determined whether or not it is below the upper threshold (W h. If it is judged that it is below, in step S
Print out the inversely counted value 27 of I'Jf at the time when I'imeX has elapsed.

As explained above, according to the present invention, the peak hardness of 116 in a hardness test of an elastic body such as rubber or the hardness value after a certain period of time is read as tH)1 by a fill means such as a microcomputer. It will be displayed as follows.
The hardness after IUI is 116 without causing any artificial difference when the needle is pressed against the oil during measurement as in the past.
In measurement, the time point when peak 1 occurs is set at 1fll.
Since the starting point is 1, it is possible to obtain data with good reproduced images regardless of the unstable time 1τ of one time when the gauge is pressed against the sample.In addition, by setting a threshold value,
．． For example, unstable inputs caused by accidentally touching the indenter of the testing machine when testing a warm rock in 11 will not become a valid value, preventing sheet piles during the test, and preventing Since the printer prints out t-size ++Jr L, -C, there is no interruption for data input during printing, and accurate data can be obtained efficiently.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the &71 production sequence, and FIGS. 3 and 4 are characteristic diagrams explaining the present invention in detail. 1... Test device 2... Spring type rubber hardness tester with built-in rotary encoder 6... Heavy weight 4... Connector 5
Column 8...Slide bearing W...Test piece 11...Microcomputer 12...
・Keyboard 16... Printer 21... Pressure start point 22... Reading start point 23... Peak value 24... Pressure release point 25... Reset point 26... Pressure end point 27... Hardness value after a certain period of time Patent applicant Shimadzu Corporation

Claims (1)

[Claims] In a spring-type rubber hardness tester, it relates to a means for converting the displacement of the indenter of the testing machine into the number of pulses, a reversible counting means for counting the number of pulses, and an upper H-bi indenter using the reversible counting means. A means for detecting the peak value of the h reading, a timer means for starting from the time when the peak value occurs, and an indication value related to the above-mentioned pointer by the above-mentioned peak value and the above-mentioned reversible counting means at the time when the set time has elapsed. A means for displaying the stored values, and a means for detecting coincidence between the value obtained by the reversible counting means and a preset value. A digital rubber hardness meter that is characterized by automatically digitally displaying the hardness value after an arbitrary period of time has elapsed after occurrence.