JPH08159940A - Method for detecting burst part when hose is swung - Google Patents

Abstract

PURPOSE: To provide a method for detecting a burst part at the time of swinging of a hose where stress distribution applied to the hose and the burst part can be quickly and accurately detected in the case of performing the swinging test of the hose with a metal fitting. CONSTITUTION: A hose 3 with metal fittings where hose fittings 2 and 4 are clamped at both terminals is prepared and the hose fitting part side on one terminal side of the hose is fixed to a fixing device and at the same time, the hose is swung from the hose fitting part side on the other terminal side. Then, the outer-periphery temperature distribution of the hose is detected by an infrared temperature sensor 7 and the stress distribution applied to each part of the hose and a burst part are estimated from the detected temperature distribution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a ruptured portion of a hose during rocking.

[0002]

Brake hoses for automobiles are important safety parts for braking vehicles.

For this reason, the brake hose has been subjected to various severe durability tests.

One of such durability tests is a hose swing test.

In this hose swing test, first, a hose with a mouth fitting in which hose mouth fittings are fastened to both terminals is prepared.
Next, this is a test in which the one end side of the hose fitting is fixed to a fixing device, and then the other end of the hose fitting is repeatedly oscillated in the vertical direction and the steering direction.

The end of the life of the rocking test of this hose is when the hose bursts or a significant abnormality occurs.

Therefore, the swing resistance of the hose is evaluated by the number of swings until the hose bursts or a remarkable abnormality occurs.

FIG. 4 is a front explanatory view showing a conventional hose swing test method.

In FIG. 4, 1 and 5 are hose mouth fitting mounting jigs, 2 and 4 are hose mouth fittings, 3 is a hose, 6 is a movable base, and a, b, c, d and e are measurement points.

That is, as can be seen from FIG. 4, in the conventional hose swing test, first, a hose 3 with a mouth fitting in which the hose mouth fittings 2 and 4 are fastened to both ends is prepared, and then the hose on one end side thereof. This is a test in which the mouth fitting 2 part side is fixed to the hose mouth fitting mounting jig 1 of the fixing device, and then repeatedly rocked in the vertical direction and the steering direction from the hose mouth fitting 4 side on the other end side.

Here, a fluid can be put into the hose if necessary. The fluid pressure, the test atmosphere temperature, the rocking condition, etc. are appropriately determined according to the conditions corresponding to the actual piping conditions of the hose 3 with a fitting.

The rocking test is repeatedly performed under these various set conditions, and as a result, the hose 3 with a fitting having excellent rocking resistance is judged and the piping conditions are changed. Conventionally, a rocking test was performed under all expected piping conditions to determine the ruptured portion of the hose, and it was determined whether or not the hose 3 with a fitting suitable for the piping was used. For this reason, it was necessary to install a large number of expensive rocking testers and perform enormous tests over a long period of time.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and the object of the present invention is to solve the above-mentioned drawbacks of the prior art and to perform a swing test of a hose with a mouthpiece. In this case, it is another object of the present invention to provide a method of detecting a ruptured portion of a hose that can accurately estimate in which portion of the hose the stress is concentrated and where the ruptured portion is in a short period of time.

[0014]

SUMMARY OF THE INVENTION The gist of the present invention is to first prepare a hose with a mouth fitting which has a hose mouth fitting fastened to both ends, and then attach the hose mouth fitting part side at one end side thereof. After fixing to the fixing device, swing the hose from the other end side of the hose mouth fitting side under conditions suitable for practical conditions, and then detect the outer temperature distribution of the hose with an infrared temperature sensor, and detect the detected temperature. It is a method for detecting a ruptured portion during rocking of the hose, which is characterized by estimating the ruptured portion from the distribution.

In the present invention, the infrared temperature sensor may be thermography or the like.

With this thermography, the temperature distribution can be measured even when the hose is rocked, and of course the temperature distribution can be detected quickly and easily in a non-contact state even when the rocking is stopped.

The thermography comprises a camera section, an image processing section, a display section and the like.

Further, the installation position of this thermography may be in front of, above, below, or in other directions of the test hose, and it is essential that the temperature is accurately detected.

[0019]

The method of detecting a ruptured portion of a hose according to the present invention when swinging,
When the hose is rocked under conditions suitable for practical use, the infrared temperature sensor can quickly and easily detect the outer peripheral temperature distribution of the hose in a non-contact state, and estimate the hose stress distribution from those temperature distributions. Furthermore, it is possible to accurately estimate the portion of the temperature distribution having the largest temperature rise difference as the rupture site in a short period of time.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for detecting a ruptured portion during rocking according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of a method for detecting a ruptured portion of a hose according to the present invention when it oscillates.

In FIG. 1, 1 and 5 are hose mouth fitting mounting jigs, 2 and 4 are hose mouth fittings, 3 is a hose, 6 is a movable base, a, b, c, d and e are measurement points, and 7 is 3 is a thermography of an infrared temperature sensor which is a feature of the present invention.

That is, as can be seen from FIG. 1, in one embodiment of the method for detecting a ruptured portion at the time of rocking of the present invention, first, a hose 3 with mouth fittings in which hose mouth fittings 2 and 4 are fastened to both terminals is prepared. Then, fix the hose mouth fitting 2 part side at one end side to the hose mouth fitting mounting jig 1 of the fixing device, and repeat from the hose mouth fitting 4 part side at the other end side in the vertical direction and the steering direction. Giving rocking.

Here, the brake fluid is put in the hose, the fluid pressure is set to 50 kg / cm ² , the temperature is 70 ° C., and the rocking conditions are set in accordance with the conditions corresponding to the actual piping conditions of the hose 3 with a fitting. did. The movable base 6 is set to have a stroke according to a practical state.

In this state, the hose 3 with a mouth fitting
The sample was rocked for 00 times, and immediately thereafter, the temperature of each part of the hose was measured by the thermography 7 preset above.

FIG. 2 shows the hose 3 shown in FIG.
The image processing apparatus calculates the temperature rise difference between the positions of d and e,
It is the graph which plotted those values.

As can be seen from FIG. 2, the hose position where the temperature difference is the largest is point a.

When this rocking test was continued until further rupture, the hose breakage site was point a, and the correlation between the two was completely in agreement.

Further, when the relationship between the difference in temperature rise and the number of times of rocking until the hose bursts is examined by various tests on the same type of hose, the relationship as shown in FIG. 3 is obtained.

Therefore, if the relationship between the temperature rise difference and the number of swings until the hose bursts as shown in FIG. 3 is obtained in advance, the swing of the hose under a piping condition that is faster and easier than the detected temperature rise difference. Life expectancy can be estimated.

[0031]

EFFECTS OF THE INVENTION According to the method of detecting a ruptured portion during rocking according to the present invention, when a rubber hose or a plastic hose is piped under specified piping conditions, temperature rise distribution, stress distribution, rupture point, etc. of each portion of the hose Can be detected and estimated quickly and easily, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing an embodiment of a method of detecting a ruptured portion of a hose according to the present invention during rocking.

2 is a view of the hose a, b, c, d, shown in FIG.
It is the graph which plotted the temperature rise difference in the position of e.

FIG. 3 is a graph showing the relationship between the temperature rise difference detected by the method of detecting a ruptured portion during rocking of the present invention and the number of rocks before rupturing the hose.

FIG. 4 is a front explanatory view showing a conventional hose swing test method.

[Explanation of symbols]

 1, 5 Hose mouth fitting mounting jig 2, 4 Hose mouth fitting 3 Hose 6 Movable base a, b, c, d, e Each measuring point 7 Infrared temperature sensor

Claims (4)

[Claims] 1. A hose with a mouth fitting in which hose mouth fittings are fastened to both ends is prepared, and the one end side hose mouth fitting part side of the hose with the mouth fitting is fixed to a fixing device and the other end side hose is provided. By swinging the hose from the fitting side, and then detecting the outer peripheral temperature distribution of the hose with an infrared temperature sensor, and estimating the stress distribution and the ruptured part applied to each part of the hose from the detected temperature distribution. A characteristic method for detecting a rupture site when the hose swings. 2. The method of detecting a ruptured portion of a hose according to claim 1, wherein the infrared temperature sensor is a thermograph. 3. A method for detecting a ruptured portion of a hose according to claim 1, wherein the outer peripheral temperature distribution of the hose is detected by an infrared temperature sensor while the hose is being rocked. 4. The rupture of the hose during rocking according to claim 1, wherein after the rocking of the hose, the peripheral temperature distribution of the hose which has stopped rocking is detected by an infrared temperature sensor in a non-contact state. Part detection method.