JPH04203950A - Method and apparatus testing durability of hose - Google Patents

Abstract

PURPOSE:To perform the durability test of a hose in the whole circumferential direction and to evaluate the hose with high reliability irrespective of the usage of the hose by conducting the impact oil pressure test for the hose while rotating the hose around an axis thereof. CONSTITUTION:A motor 13 rotates a hose 10 to be tested in a predetermined direction around a hose mounting shaft 113. An oil pressure generating device 14 supplies a pulse-like pressuring oil with a predetermined interval to a hose mounting shaft 123 of a manihold 12, namely, the hose 10. When the impact oil pressure is impressed to the hose 10, the hose 10 is alternately expanded and contracted continuously in the whole of the circumferential direction. During the impact oil pressure test, the impact oil pressure can be impressed while the above state is repeated. Therefore, the test can be carried out in the whole circumferential direction of the hose 10. The hose can be evaluated with high reliability irrespective of the usage thereof.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a hose durability test method for testing the durability of a hose by repeatedly applying impact hydraulic pressure to the inside of the hose while subjecting the hose to a predetermined motion. It is related to the device.

(Prior Art) Conventionally, as a test method of this kind, for example, as shown in FIGS. Connect both ends of the hose 1 to be tested, and shape the hose 1 to be tested into an abbreviated shape (Fig. 2) or a substantially U-shape (see Figure 2).
The so-called fixed method, in which the impact hydraulic pressure from the hydraulic pressure generating device 4 is applied to the hose 1 to be tested via one of the fixed manifolds 2 while the hose is fixed to the
As shown in the figure and FIG. 5, one manifold 2 may be fixed and the other manifold 3 may be reciprocated along a predetermined axis (see FIG. 4), or the manifold 3 may be moved in a circle centered at a predetermined position. By moving the hose 1 to be tested along a trajectory (Fig. 5), while giving a swinging motion to the hose 1 to be tested, the impact hydraulic pressure from the hydraulic pressure generator 4 is applied to the hose to be tested via one fixed manifold 2. 1 is known.

(Problem to be Solved by the Invention) However, with the above fixed method, the purpose can be fully achieved as a durability test for hoses used in a fixed state, but for hoses used in a movable state. Not enough.

In addition, with the rocking motion application method, it is possible to repeatedly bend the hose 1 to be tested, so it can be said to be suitable for durability testing of hoses used in a movable state. Since the receiving portion is always fixed in the circumferential direction, it is not possible to conduct a durability test covering the entire circumferential direction of the hose 1 to be tested.

The present invention has been made in view of such circumstances, and its purpose is to be able to conduct durability tests over the entire circumferential direction of the hose.
It is an object of the present invention to provide a hose durability test method and apparatus that enable highly reliable evaluation regardless of the application.

(Means for Solving the Problem) In order to achieve the above object, claim (1) provides a hose that tests the durability of the hose by repeatedly applying impact hydraulic pressure to the inside of the hose, which is bent at least partially in the longitudinal direction. In the durability test method, the impact hydraulic pressure was applied to the hose to be tested while subjecting it to rotational motion about its axis.

Claim (2) also provides a pair of manifolds having rotatable hose attachment shafts, and a pair of manifolds that are attached such that at least a portion of the hose attachment shaft of at least one of the manifolds or each manifold is bent in the longitudinal direction. A hose durability testing apparatus was constructed, which includes a hose rotating means for rotating a hose to be tested around its hose axis, and an impact hydraulic pressure applying means for repeatedly applying impact hydraulic pressure to the hose to be tested.

Moreover, in claim (3), an angle adjustment part is provided that can adjust the mounting angle of at least one manifold with respect to a predetermined plane.

Moreover, in claim (4), a position adjustment section that can adjust the distance between both manifolds is provided.

(Function) In claim (1), the hose to be tested is rotated around its hose axis, and impact hydraulic pressure is applied to the hose to be tested. As a result, the hose to be tested is continuously and alternately subjected to elongation and compression over the entire circumferential direction.
In this state, an impact hydraulic test is performed.

According to claim (2), the hose rotating means rotates the hose under test in a predetermined direction about the hose axis, and the impact hydraulic pressure applying means applies impact hydraulic pressure to the hose under test.

Further, according to claim (3), the angle adjustment section adjusts the mounting angle of the manifold with respect to a predetermined plane, and the hose to be tested is held in a predetermined shape.

Further, according to claim (4), the interval between the manifolds to which the hose to be tested is coupled is adjusted by the position adjustment section, and the hose to be tested is held in a predetermined shape.

(Example) FIG. 1 is a configuration diagram showing an example of a hose durability testing device according to the present invention. In FIG. 1, 10 is a hose to be tested, 11 and 12 are a pair of manifolds, 13 is a motor as a means for rotating the hose, and 14 is a hydraulic pressure generating device as a means for applying impact hydraulic pressure.

As shown in FIG. 6, the manifold 11 has its upper surface 1
The base 1 has a hose attachment shaft 113 rotatably inserted from the base 11 to the lower surface 112, and has a predetermined plane number.
Both side parts 114 and 115 are rotatably supported by support stands 151 and 152 fixed on the support bases 151 and 152 via fixed shafts L14a and 115a.

A joint 116 is provided at the end of the upper surface 111 side of the hose attachment shaft 113 to connect the hose 10 to be tested and the hose attachment shaft 113 so that their axes coincide with each other.

At the end of the lower surface 112, there is a pulley 117 whose axes coincide with each other.
is attached, and the end surface on the lower surface 112 side is closed.

Furthermore, fixing screws 15La and 152a are provided on the upper portions of the support stands 151 and 152 to fix the supported fixed shafts 114a and 114b at a predetermined rotation angle.

These fixing screws 151a, 152a, fixing shaft L1
4a.

115a constitutes an angle adjustment section of the manifold 11.

The manifold 12 is arranged on the base 15 at a predetermined distance from the manifold 11, and has a hose attachment shaft 123 rotatably inserted from the upper surface 121 to the lower surface 122, as shown in FIG. , support stands 153, 15 that are movably attached to guide rails 155 and 156 formed on the base 15 in the left and right directions in FIG.
4, both sides 124° 125 are fixed shafts 124a, 1
It is rotatably supported via 25a.

A joint 126 is provided at the end of the hose attachment shaft 123 on the upper surface 121 side, and connects the hose under test 10 and the hose attachment shaft 123 so that their axes coincide with each other.
At the end of the 22 side, a hydraulic generator 1 is attached to the hose attachment shaft 123.
Rotary joint 12 for supplying pressure oil according to 4
7 is installed. Therefore, the rotary joint 127 is located between the guide rails 155 and 156 of the base 15.
A groove 157 is formed to guide the holder in the left-right direction in FIG. 1 in a non-contact manner.

Furthermore, fixing screws 153a, 154a are provided on the upper portions of the support stands 153, 154 for fixing the supported fixed shafts 124a, 125a while maintaining a predetermined rotation angle.

Furthermore, a locking mechanism (not shown) is provided at the lower part of the support bases 153 and 154, which can fix the position with respect to the guide rails 155 and 156 and release the locking mechanism.

These fixing screws 153a, 154a, fixing shaft 12
4a.

125a constitutes an angle adjustment section of the manifold 12, and guide rails 155, 156, support stands 153, 154, and groove 157 constitute a position adjustment section.

The motor 13 is arranged in parallel with a fixed plate 132 attached to the front surface 118 (FIG. 6) of the manifold 11, with its motor pulley 131 spaced apart from the pulley 117 attached to the hose attachment shaft 113 of the manifold 11 at a predetermined distance. has been done. A drive belt 133 is passed between the motor pulley 131 and the pulley 117, so that the motor 13 rotates the hose mounting shaft 113, that is, the hose 10 under test, in a predetermined direction (can rotate in forward and reverse directions) around the hose shaft. ).

The hydraulic pressure generator 14 has an output part connected to the rotary joint 127 via a hose or the like, and is connected to the manifold 12.
Pulsed pressure oil is supplied at predetermined intervals to the hose attachment shaft 123, that is, the hose 10 to be tested.

Next, the operation of the above-mentioned configuration will be explained using an example in which the hose 10 to be tested is held in an L-shape and tested as shown in FIG.

First, connect one end of the hose 10 to be tested to the joint 11.
6 to the hose attachment shaft 113 of the manifold 11, and the other end of the hose 10 to be tested is connected to the hose attachment shaft 123 of the manifold 12 via a joint 126.

Next, loosen the fixing screws 151a, 152a, 153a, 154a of the support stands 151, 152, 153.
Rotate the fixing screws 151a, 152a, 153a by a predetermined angle, for example, 45 degrees so that they face each other, and in this state, tighten the fixing screws 151a, 152a, 153a
, 154a to fix the fixed shafts 114a, 115a,
124a and 125a are fixed. Furthermore, the support stand 153
．． The lock mechanism (not shown) of 154 is unlocked, and the supports 153 and 154 are moved to the guide rails 155° and 156.
The hose 10 to be tested is held in a predetermined L-shape by guiding the hose 10 to a desired position along the lines and locking the support stands 153 and 154.

In this state, the hydraulic pressure generator 14 is driven to apply a pulsed hydraulic pressure to the hose 10 to be tested, and
The motor 13 is driven to rotate the hose attachment shaft 113 in a predetermined direction.

As a result, the hose 10 to be tested rotates around its hose axis, and the impact hydraulic pressure test is performed in a state where the hose 10 to be tested is alternately subjected to elongation and compression over the entire circumferential direction.

In addition, in order to conduct an impact hydraulic test while holding the hose 10 to be tested in a U-shape, as shown in FIG.
2 in the direction approaching the manifold 11 and fix it.

As explained above, according to this embodiment, the hose 10 to be tested can be rotated at any angle (practically, from 0 degrees to 180 degrees).
and the hose mounting shaft 11 is set by the motor 13.
Since the impact hydraulic test is performed while rotating the hose 10 to be tested around its hose axis through the It is possible to apply impact hydraulic pressure while repeatedly generating it, and highly reliable evaluation is possible regardless of the application.

In this example, the operation was explained by limiting the rotational direction of the hose 10 to be tested to one direction, but it is not limited to this. For example, the rotational direction may be reversed at every predetermined number of rotations. Various modes are possible, such as rotating by a predetermined angle in accordance with the pulse interval of the applied hydraulic pressure. In addition to the above configuration, it is also possible to fix the other end of the hose 10 under test or the hose attachment shaft 123 on the side of the manifold 12 (suppress rotation), and perform an impact hydraulic test by twisting the hose 10 under test. It may be configured as follows.

Also, depending on the oil flow in the impact hydraulic test, rotary joints may be attached to both manifolds.

(Effects of the Invention) As explained above, according to claim (1), since the impact hydraulic test is performed while rotating the hose to be tested around its hose axis, the hose to be tested can be rotated 360 degrees in the circumferential direction of the hose to be tested. It is possible to apply impact hydraulic pressure while continuously and alternately generating elongation and compression states over the entire area, making it possible to perform highly reliable evaluations regardless of the application.

Further, according to claim (2), it is possible to accurately apply impact hydraulic pressure while continuously and alternately repeating the expansion and compression states over the entire 360 degrees in the circumferential direction of the hose to be tested.

Furthermore, according to claim (3) or (4), the hose to be tested can be stably held in a desired shape.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the hose durability testing device according to the present invention, Fig. 2 is an explanatory diagram of the first conventional example, Fig. 3 is an explanatory diagram of the second conventional example, and Fig. 4 is an explanatory diagram of the third conventional example, FIG. 5 is an explanatory diagram of the fourth conventional example, FIG. 6 is a configuration diagram of one manifold according to the present invention, and FIG. 7 is an explanatory diagram of the other manifold according to the present invention. FIG. 8 is a block diagram showing another embodiment of the hose durability testing device according to the present invention. In the figure, 10...Hose to be tested, 11.12...
Manifold, 13... motor (hose rotation means),
14... Hydraulic pressure generator (impact hydraulic pressure applying means). Patent Applicant Yokohama Rubber Co., Ltd. Representative Patent Attorney Yoshi 1) Hose to be tested A configuration diagram showing an embodiment of the present invention Figure 1 1 Hose to be tested Figure 2 Figure 3 An explanatory diagram of a conventional example Figure 4 Figure 5 Figure 8

Claims (4)

[Claims] (1) In a hose durability test method that tests the durability of a hose by repeatedly applying impact hydraulic pressure to the inside of a hose that is bent at least partially in its longitudinal direction, the hose under test undergoes rotational motion about its axis. A hose durability test method, characterized in that the impact hydraulic pressure is applied while applying. (2) A pair of manifolds having freely rotatable hose attachment shafts, and a hose to be tested that is attached so that at least a portion of its longitudinal direction is bent with respect to at least one hose attachment shaft of these manifolds or each manifold. A hose durability testing device comprising: a hose rotating means for rotating the hose around its axis; and an impact hydraulic pressure applying means for repeatedly applying an impact hydraulic pressure to the hose to be tested. (3) The hose durability testing device according to claim (2), further comprising an angle adjustment section that can adjust the mounting angle of at least one manifold with respect to a predetermined plane. (4) The hose durability testing device according to claim (2) or (3), further comprising a position adjustment section that can adjust the distance between both manifolds.