JPH0827226B2 - Impact resilience tester - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an impact resilience tester for measuring the impact resilience of a vulcanized rubber in accordance with Japanese Industrial Standards for Testing Methods for Vulcanized Rubber. .

[Prior art]

Currently, there are four types of test methods for vulcanized rubber repulsion elasticity, such as the Lupke type, the Shov type, the Goodyear Healey type, and the Dunlop trypsometer type.
The Japanese Industrial Standards (JIS) specify the Lupke-type impact resilience test device, which is said to be the most accurate of these.

The Lupke type impact resilience test apparatus suspends an iron striking rod with a hanging thread, and drops the suspended striking rod toward a vulcanized rubber sample piece to be measured from a predetermined height in an arc shape by gravity. The maximum rebound height at that time is read to obtain the impact resilience characteristic value. However, because the maximum bounce height of the striking rod is visually read by the measurer,
It was technically difficult to read accurately and was often misread. Also, in order to be able to read accurately,
It required considerable skill.

Therefore, in order to solve the above problem by automation, a speed sensor is provided on the side where the elastic sample piece is installed, and the difference between the entry speed and the exit speed when the striking rod collides with the vulcanized rubber sample piece is measured. It is proposed that the maximum bounce height is predicted by the speed difference. However, since the speedometer is installed near the vulcanized rubber sample piece in this automated reading device, the speedometer interferes with the work of replacing the vulcanized rubber test piece, and the measurement work is significantly inefficient. There was a problem to do.

[Object of the Invention]

The object of the present invention is to solve the above-mentioned conventional problems,
There is no misreading such as visual reading, there is no hindrance to the replacement work of the vulcanized rubber test piece and the efficiency of the measurement work is not reduced, and it is possible to automatically measure the impact resilience characteristics with high accuracy. An object of the present invention is to provide a repulsion elasticity test device that can be used.

[Structure of Invention]

The impact resilience test device of the present invention to achieve the above object, when the striking rod is suspended by a filamentous material, when the suspended striking rod is dropped in an arc shape by gravity, and the tip thereof collides with a vulcanized rubber sample piece. In the impact resilience test device in accordance with the Japanese Industrial Standards for the test method of vulcanized rubber to measure the maximum rebound height, above the arc-shaped drop area of the striking rod,
An image sensor having a lens and a large number of sensor elements arranged in a line in a straight line facing the lens, which scans the arc-shaped falling area in the field of view, is installed, and a high-frequency lighting light source is provided below the arc-shaped falling area. And a sensor element in which the light from the high-frequency lighting light source is blocked by the movement of the striking rod during measurement, a voltage at a level of approximately 1/2 or less of the sensor element receiving the high-frequency lighting light source is generated. It is characterized by being configured as described above.

Hereinafter, description will be given with reference to the embodiments of the present invention shown in the drawings.

FIG. 1 shows a rebound resilience test apparatus according to an embodiment of the present invention in which an improved mechanism according to the present invention is incorporated into a basic structure defined in Japanese Industrial Standard (JIS) K6301-1975 concerning a test method for vulcanized rubber. Reference numeral 1 is a measuring table, and 2 is a column vertically installed on the measuring table 1. An arm 3 extending laterally is fixed to the upper end of the pillar 2, and an iron striking rod 5 is attached to the arm 3 by two front and two rear suspension threads 4, 4; Suspended for pendulum motion. Also,
A support device 8 for the elastic sample piece 7 is provided at a position on the column 2 corresponding to the tip of the striking rod 5. The elastic sample piece 7 is detachably attached to the supporting device 8.

Reference numeral 6 denotes a solenoid, which is fixed on the measuring table 1 through a supporting means (not shown), and is turned off (demagnetized) when the start switch 15 is turned on and turned on (excited) when turned off. When the solenoid 6 is turned on, the striking rod 5 can be sucked and set to the raised position shown by the chain line. Start switch
When 15 is turned on and solenoid 6 is turned off, striking rod 5
Is released and falls in an arc shape due to gravity, the impact end of the tip collides with the vulcanized rubber sample piece 7, and is rebounded by the elasticity of the vulcanized rubber sample piece. The striking rod 5 is attenuated while repeating collision bounces several times, but in JIS, the impact resilience value is defined by the bounce height immediately after the first impact.

Reference numeral 9 is a scale plate provided along the arcuate falling area of the striking rod 6, and is provided for visually measuring the bounce height. The scale plate 9 is provided with scales that divide a vertical height of 100 mm into 100 equal parts.

The striking rod 5 has a length of about 356 m and a diameter of 12.
7mm, forming a hemispherical striking end with a diameter of 12.7mm at the tip,
In addition, a pointer 5a for indicating the scale plate 9 is provided at the rear end,
And it is formed so that the mass is 350 g. Further, the suspension height (length) of the striking rod 5 by the hanging thread 4 is set to 2000 mm, and the drop height is set to 100 mm in the vertical direction. The pointer 5a of the striking rod 5 indicates 0 of the scale of the scale plate 9 when it is freely suspended, and the striking end is in a state of touching the surface of the vulcanized rubber sample piece 7.

Although the above is the basic configuration according to JIS, the present invention is
Based on such a basic configuration, the arm 10 is attached to the support column 2.
The arm 10 is fixed, and the arcuate falling area of the striking rod 5 is scanned within the range of the visual fields S, S ′ (for example, a scanning speed of 1000
The image sensor 11, which is designed to perform the operation (per second), is fixed. In addition, the measuring table 1 facing the image sensor 11
A high-frequency lighting light source 14 such as a fluorescent lamp is installed on the upper part of the striking rod 5 with the arc-shaped fall area interposed therebetween.

As shown in FIG. 3, the image sensor 11 includes a lens 12 and sensor elements 13, ..., 13 that face the lens 12 and are arranged linearly with a large number of bits (for example, 2048 bits). It is configured. The many sensor elements 13, ..., 13 arranged in a straight line are adapted to receive the light of the high-frequency lighting light source 14 and convert it into an electric signal. While the sensor element whose light is blocked by the striking rod 5 generates a voltage level signal, the light from the high-frequency lighting light source 14 is blocked by the movement of the striking rod 5 at the voltage level of 0 to 6 V, that is, during measurement. The sensor element is adapted to generate a voltage at a level which is approximately 1/2 or less of that of the sensor element receiving light from the high frequency lighting light source 14. The voltage level when cut off is 0 to 6V
Even if a voltage of 0 to 6 V is generated due to noise, the slice level is set to 6 V so that it will not be mistaken for receiving the high frequency lighting light source 14.
It depends on the setting. Moreover, the high frequency lighting light source 14 is
Since the frequency is much higher than that of the AC power source (50 Hz or 60 Hz), the image sensor 11 hardly loses sight of the position of the striking rod 5 when the high frequency lighting light source 14 is in the extinguished state. The bounce height of 5 can be measured more accurately.

The image sensor 11 starts scanning when the start switch 15 is turned on and, at the same time, starts striking.
Since the sensor element shielded from light generates a signal of a voltage level of about 1/2 or less, the number of bits of the sensor element that generated this signal is counted (or the sensor element receiving the light is counted). You may count the number of bits). The counted signal is then interfaced.
Input to the personal computer 18 via 17. The personal computer 18 calculates the maximum bounce height of the striking rod by a predetermined conversion formula based on the above number of bits, and displays the output value on the display tube (CRT) 1
Displayed on 9, and printed out by the printer 20 if necessary.

The test apparatus shown in FIG. 1 is provided with an OK lamp 22 and a fiber sensor 21 in order to reliably perform the above-mentioned automatic measurement. The OK lamp 22 indicates that the measurement preparation is completed, and the fiber sensor 21 checks whether or not the striking rod 5 is set on the solenoid 6.

Further, in the above-mentioned apparatus, an automatic / manual switch 16 is provided in order to enable conventional manual measurement in addition to the automatic measurement operation using the image sensor. When this switch 16 is switched to the automatic side, automatic measurement is possible, and when it is switched to the manual side, manual measurement by visual measurement is possible.

FIG. 2 shows a block diagram when the above-mentioned automatic measurement and manual measurement are switched and operated.

As shown in this block diagram, in the case of automatic measurement, the OK / 22 is turned on when the automatic / manual switch 16 is switched to the automatic side and the measurement preparation is completed. When the start switch 15 is turned on after the OK lamp 22 is turned on, the fiber sensor 21 confirms whether or not the striking rod 5 is set to the solenoid 6 by suction. This set confirmation signal and above start switch
An automatic start is started by an AND signal with the ON signal of 15 and the solenoid 6 is turned off. When the solenoid 6 is turned off, the striking rod 5 is opened and the measurement is started. After that, as described above, the image sensor 11 counts the number of bits of the sensor element 13, and the counter count 1
Display tube 19 through 7 ', interface 17, personal computer 18
Or to the printer 20.

In the case of manual measurement, the automatic / manual switch 16
By switching to the manual side, manual measurement becomes possible as shown in the block diagram.

In the case of the above-described automatic measurement of the present invention, how accurately the image sensor can confirm the position of the rear end of the striking rod is very important for improving accuracy. In order to further improve such accuracy, as shown in FIG. 4, the rear end portion of the striking rod 5 is formed in a square shape, and the rear end edge 5b thereof is a straight line orthogonal to the falling direction of the striking rod 5. It is good to form so that. Moreover, the rear end surface 5c of the striking rod 5 is formed in an inclined shape, and the angle α of the rear end surface 5c is set to the solenoid 6 by suction and set in the image sensor 11
It may be formed so as to be parallel to or inside the region line S of the field of view.

〔The invention's effect〕

As described above, the present invention suspends the striking rod with a filamentous material, drops the suspended striking rod in an arc shape by gravity, and causes the tip end to collide with the vulcanized rubber sample piece to have the maximum rebound height. In a repulsion resilience test device conforming to the Japanese Industrial Standards for the test method of vulcanized rubber to be measured, above the arc-shaped drop area of the striking rod, scan the arc-shaped drop area in the field of view, the lens and the lens An image sensor with a large number of sensor elements arranged in a straight line facing each other is installed, a high-frequency lighting light source is installed below the arc-shaped drop area, and the high-frequency lighting light source is moved by the movement of the striking rod during measurement. Since the sensor element that is shielded from light is configured to generate a voltage at a level that is approximately 1/2 or less of that of the sensor element receiving light from the high-frequency lighting light source, it has the following excellent effects. Ah .

a). An image sensor that reads and scans the bounced image of the striking rod is installed above the arc-shaped fall area of the striking rod, facing this arc-shaped fall area, and a high-frequency lighting light source is installed below the arc-shaped fall area. Therefore, the structural standard value in the test device specified by the JIS standard (for example, JIS K6301-1975) regarding the test method of vulcanized rubber, that is, "the iron bar is suspended horizontally by four suspending threads, and its striking end is Is 12.7
It has a hemispherical shape with a diameter of mm, and has a pointer at the other end. The iron bar is a round bar having a length of about 356 mm, a diameter of 12.7 mm and a mass of 350 g. "..." without violating the provisions of the JIS standard, and while making the impact resilience tester comply with the JIS standard, an image sensor causes the impact rod to drop in an arc shape by gravity and collide with a vulcanized rubber sample piece. It is possible to automatically read the maximum bounce height without visual inspection, eliminating visual reading errors and always obtaining accurate measurement values.

b). The bounce height of the striking rod is read by an image sensor having a lens and a large number of sensor elements arranged in a line in a straight line facing the lens, so that the scanning speed and the density of the sensor elements are increased to be precise and The maximum bounce height can be easily measured.

Moreover, since a high-frequency lighting light source having a frequency much higher than that of an AC power supply (50 Hz or 60 Hz) is provided for an image sensor having many built-in sensor elements, the image sensor when the light source is in a state of extinction There is almost no effect of losing the position of the striking rod, and the rebound height of the striking rod can be measured more accurately by the image sensor.

c). Since the image sensor is installed above the arc-shaped drop area of the striking rod and the high-frequency lighting light source is installed below the arc-shaped drop area, it is not near the vulcanized rubber sample piece that is attached to and detached from the impact resilience tester. In addition, the work of exchanging the sample piece is not hindered and the efficiency of the measurement work is not lowered.

d). The test device is configured so that the sensor element in which the light from the high frequency lighting light source is blocked by the striking rod is configured to generate a voltage at a level of approximately 1/2 or less of the sensor element receiving the light from the high frequency lighting light source. Accurate measurement is always possible without misreading due to the influence of a noise light source from the surroundings (for example, an electric light in the room).

[Brief description of drawings]

FIG. 1 is a schematic view of a repulsion elasticity test apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram when operating the same, FIG. 3 is a schematic explanatory view of an image sensor, and FIG. It is a principal part perspective view which shows the preferable embodiment of this. 4 ... Suspension thread, 5 ... Strike rod, 6 ... Solenoid, 7 ...
… Vulcanized rubber specimen, 11 …… Image sensor, 12 …… Lens, 13 …… Sensor element, 14 …… High frequency lighting light source, 15 ……
Start switch.

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References Open 59-128555 (JP, U) Open 59-87649 (JP, U) Open 53-67488 (JP, U)

Claims (1)

[Claims] 1. A striking rod is suspended by a thread, and the suspended striking rod is dropped in an arc shape by gravity, and the maximum rebound height when the tip of the striking rod is collided with a vulcanized rubber sample piece is measured. In the impact resilience test device in accordance with the Japanese Industrial Standards for the test method of vulcanized rubber, above the arc-shaped drop area of the striking rod, scan the arc-shaped drop area in the field of view, scan the lens and the lens facing each other. Installed an image sensor with a large number of linearly arranged sensor elements, installed a high-frequency lighting light source below the arc-shaped fall area, and blocked the light from the high-frequency lighting light source by the movement of the striking rod during measurement. The repulsion elasticity testing device is characterized in that the above-mentioned sensor element is configured to generate a voltage at a level of approximately 1/2 or less of that of the sensor element receiving light from the high-frequency lighting light source.