JPH05118981A - Method and device for measuring stress relaxation of viscous material - Google Patents

Abstract

PURPOSE:To provide a measuring method and a device therefor in which the relaxation of a viscous material can be precisely and rapidly measured without depending on the artificial operation by a measuring person. CONSTITUTION:The rotating speed of a rotor 5 return-rotated by the reaction stored in a sample 3 is detected, and the time until the rotating speed becomes zero is measured as a relaxation time. A rotary encoder 22 operated interlockingly with the rotating shaft of the return-rotating rotor 5 and an arithmetic means for counting the pulse outputted from the rotary encoder 22 and arithmetically calculating the time during the return rotation of the rotor 5 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring the relaxation degree of stress by measuring relaxation time of a viscous substance sample such as rubber.

[0002]

2. Description of the Related Art Conventionally, the Mooney test for measuring the viscosity of a viscous substance has been often performed, but there is no suitable device capable of automatically measuring the stress relaxation degree of a sample whose viscosity has been measured.

[0003]

In the above-mentioned conventional measuring method, the measurer visually observes the movement of the rotary shaft to measure the relaxation time, so that an artificial error is likely to occur and an accurate measurement cannot be performed. There was a problem. In addition, unlike the measurement of viscosity and the like, since data is artificially collected, there is a problem that the data cannot be immediately transmitted to the data processing device and cannot be processed promptly.

An object of the present invention is to provide a method and an apparatus for measuring the stress relaxation degree of the measured sample simultaneously with the viscosity measurement.

[0005]

In order to solve the above problems, the present invention adopts the following constitution. That is, the method for measuring the stress relaxation degree of a viscous substance according to the present invention is to apply a load to a viscous substance sample such as rubber by a loading means and measure the relaxation time due to the reaction force of the sample when the load is removed to measure the sample. Is a method of measuring the stress relaxation degree of a rotor, in which a load is applied to a viscous sample in a container by the rotation of the rotor, and when the load is released, the reaction force stored in the sample returns to rotate the rotor. The relaxation time is obtained by detecting the speed and measuring the time until the rotation speed becomes a predetermined value or less. A viscous substance stress relaxation degree measuring device according to the present invention comprises a container for containing a viscous substance sample, a rotor for applying a load to the sample in the container, a driving means for rotationally driving the rotor, and the driving means. Separation means capable of interrupting load transmission to the rotor, a rotation sensor that engages with a rotation shaft of a rotor that returns and rotates by a reaction force stored in a sample, and generates a pulse according to the rotation speed of the rotation sensor, And a means for measuring a time until the output pulse interval of the rotation sensor reaches a predetermined value.

[0006]

When the load applied to the sample is removed, the rotor returns and rotates due to the reaction force stored in the sample. A pulse is output from the rotary encoder in response to this rotation, and when the rotation is stopped, no pulse is generated. The rotation speed is detected by measuring the time from the generation of this pulse to the generation of the next pulse, and if this time exceeds a certain set time, it can be determined that the rotation has stopped. Therefore, if the time from the first pulse generation to the time when no pulse is generated for a certain set time is measured, this time can be measured as the relaxation time.

[0007]

EXAMPLE FIG. 1 is a view showing the constitution of an apparatus according to an embodiment of the present invention. This viscous substance stress relaxation degree measuring apparatus 1 is constituted as a Mooney test apparatus, and is applied to a viscous substance sample 3 in a container 2. The load is applied to the sample by rotating the rotor 5. The rotor 5 is attached to a gear 11 that meshes with a gear 10 that is rotated by a motor 9 that is installed on a pedestal 7 of the machine frame 6. By driving the motor 9, the gear 11 rotates and torque is applied to the rotor 5. In addition, a load is applied to the sample 3 in the container 2. The motor 9 and the gear 10 are connected via a clutch 13, and the clutch 13 can arbitrarily interrupt the load transmission.

The load applied to the sample 3 is at the connecting portion between the end portion of the support arm 16 that is connected to the pedestal of the motor 9 and the support frame 15 of the gear 10 and the end portion of the support frame 17 attached to the machine frame 6. The installed load cell 18 detects the reaction force applied to the motor 9.

A gear 19 is further meshed with a gear 11 that rotates the rotor 5 and applies a load to the sample 3, and the support frame 2
A rotary encoder 22 as a rotation sensor is attached to the rotation shaft of the gear 19 supported by 0. The rotary encoder 22 is provided to detect the rotational speed when the rotor 5 returns and rotates due to the reaction force stored in the sample 3 in the Mooney test, and the output pulse from the encoder is a measuring device described later. Processed by.

The pulse output from the rotary encoder 22 is input to the waveform shaping circuit 23 shown in FIG. Waveform shaping circuit 23 becomes ON by detecting the rising edge of the encoder pulse, and outputs the _de-Lee digital waveform to be OFF by detecting the trailing edge. This output pulse is input to the AND circuit 25 together with the clock pulse from the clock generator. While the output pulse from the waveform shaping circuit 23 is ON, the clock pulse output from the AND circuit 25 is counted by the counter 26. The clock pulse counted by the counter 26 is
As shown in FIG. 3, the clock pulses are counted at the encoder pulse generation intervals. The count value of the clock pulse counted by the counter 26 is input to the personal computer 27 and processed. In the personal computer 27, the pulse generation interval time of the rotary encoder is obtained from this count value and the reference time of the clock, and the rotation speed of the rotor 5 is obtained.

As shown in FIG. 4, the rotation speed of the rotor 5 is high at first, slows down with the passage of time, and finally reaches zero and stops. Therefore, the generation interval of the encoder pulse is short at first, becomes longer with the passage of time, and finally no pulse is generated. Since the personal computer 27 measures the time from the generation of the encoder pulse to the generation of the next pulse as described above, if the pulse generation interval time of the encoder exceeds a certain time, for example, Tsec, the rotation time of the rotor becomes zero. You can judge that

The relaxation time in the Mooney test is the time during which the rotor 5 is returning and rotating due to the reaction force stored in the sample. Therefore, the time from when the encoder pulse first occurs to when the encoder pulse disappears is measured. By doing so, the relaxation time can be measured. Then, the pulse generation interval of the encoder measured by the personal computer 27 is accumulated, and the time until the encoder pulse generation interval becomes a certain time Tsec or more can be obtained as the relaxation time RT as shown in FIG.

Since the apparatus of this embodiment is constructed as described above, when performing the Mooney test, the motor 9 is rotated to apply torque to the rotor 5 via the clutch 13, the gear 10 and the gear 11, A load due to rotation is applied to the sample 3 in the container 2. After a lapse of a predetermined time, the clutch 13 is released, the return rotation of the rotor 5 due to the reaction force stored in the sample is transmitted to the gear 11 and the gear 19, and is extracted as a pulse signal of the rotary encoder 22 connected to the gear 19, Then, the relaxation time may be obtained by performing the processing as described above. Further, various relaxation times can be measured by appropriately setting the pulse generation interval for determining that the rotation speed of the rotor has become zero with reference to a known relaxation time.

In the apparatus of the above embodiment, the load applied to the sample is detected as the reaction force applied to the motor, but a torque cell may be provided on the container side for filling the sample. In this case, the state in which the reaction force stored in the sample is gradually attenuated can be measured, and the relaxation time may be measured by measuring the time when the reaction torque becomes zero.

[0015]

As is apparent from the above description, according to the method for measuring stress relaxation degree of a viscous substance and the apparatus therefor according to the present invention, the relaxation time can be accurately and promptly irrespective of the manual operation of the measurer. It became possible to measure.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a circuit that processes an output pulse of a rotary encoder.

FIG. 3 is a diagram showing a relationship between encoder pulses and clock pulses.

FIG. 4 is a diagram illustrating a method of measuring relaxation time according to the present invention.

[Explanation of symbols]

 1 Relaxation Measuring Device for Viscous Material Sample 2 Container 3 Sample 5 Rotor 10, 11, 19 Gear 22 Rotary Encoder 26 Counter 27 Personal Computer (Calculation Means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaaki Inoue, Inoue Masaaki, Kitano-ku, Kyoto City, No. 1 Shino Nishigoshita-cho, Kita-ku, Kyoto Prefecture (72) Masami Fujii, Inoue Masami Fujino-west Goshoda-cho, Kita-ku, Kyoto No. 1 Shimano Plant, Shimano Plant (72) Inventor Kenji Hirayama 26, Nishinokyo-Shimogoi-cho, Nakagyo-ku, Kyoto City, Kyoto Prefecture Shimazu Engineering Co., Ltd.

Claims (2)

[Claims] 1. A load is applied to a viscous sample in a container by the rotation of the rotor, and when the load is released, the reaction speed stored in the sample is detected to detect the rotation speed of the rotor that rotates back. A method for measuring the stress relaxation degree of a viscous substance, which comprises measuring a time until the value becomes equal to or less than a predetermined value to obtain a relaxation time. 2. A container for containing a sample of a viscous substance, a rotor for applying a load to the sample in the container, driving means for rotationally driving the rotor, and interruption of load transmission from the driving means to the rotor. Separation means that can be used, a rotation sensor that engages with the rotating shaft of the rotor that returns and rotates due to the reaction force stored in the sample, and that generates a pulse that corresponds to the rotation speed of the rotation sensor An apparatus for measuring stress relaxation degree of a viscous substance, comprising: