JP2001066234A - Hose bending jog for hose bending test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose bending jig for hose bending test which enables hose bending tests to be carried out easily on a hose under test having a specified diameter without allowing the specimen to escape outward upon bending the specimen along the supporting surface of a jig body. SOLUTION: A hose bending jig 1 is constituted of a jig body 3 having an arcuate supporting surface 2 having a diameter which is twice as large as the minimum bend radius of a hose under test W having a nominal diameter of 19-25 mm, and a hose pressing-down means 4 which is erected on the top 2a of the supporting surface 2 of the jig body 3. The hose pressing-down means 4 presses down the upper surface of the hose under test W when the hose under test W is bent and is composed of a gate type supporting frame 5 bestriding the top section 2a of the arcuate supporting surface 2, a vertically movable screw member 6 which is suspended in such a way that the member 6 is meshed with a nut 5a provided at the center of the frame 5, and an arcuate pressing- down member 7 attached to the lower end of the member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose bending jig for a hose bending test, and more particularly, to a hose bending jig having a minimum bending radius of 2 mm in a cold room.
When bending the hose specimen 180 degrees along the supporting surface of the jig body with double diameter, the hose specimen does not escape to the outside, and it is easy to perform the bending test with the prescribed diameter. The present invention relates to a hose bending jig in a hose bending test that has been made possible.

[0002]

2. Description of the Related Art Conventionally, a low-temperature bending test of a hose has been performed according to JIS K
The test is performed in accordance with JIS K 6375 when testing whether or not a molded hose falls within the standard.

[0003] The low-temperature bending test method of JIS K 6375 is performed when the hose has a nominal diameter of 19 mm or less and 25 mm,
The hose specimen is left in a low temperature bath at -40 ± 1 ° C for 24 + ¹ hour.

[0004] Thereafter, the hose test piece is moved to the minimum bending radius of 2 mm.
Bend for 10 ± 2 seconds along the support surface of the jig body with double diameter. When taking out the hose specimen from the low-temperature bath, the time from removal to completion of the test shall be within 12 seconds. If the nominal diameter of the hose specimen is 19 mm or less, it is bent 180 degrees, and if the nominal diameter is 25 mm, 90 degrees.
Bend every time.

After the bending test, the hose specimen is returned to room temperature,
The hose is checked for abnormalities such as breakage and cracks, and then a pressure test is performed.

[0006]

By the way, in the low-temperature bending test of the above-mentioned hose specimen, when the hose specimen is bent along the supporting surface of the jig body by holding both ends of the hose specimen, Due to the rigidity and slip, the highest point of bending of the hose specimen escapes outward, or in the worst case, the highest point kinks (breaks), making it impossible to perform a low-temperature bending test under specified conditions. there were.

An object of the present invention is to easily perform a bending test of a prescribed diameter without bending the hose test body outward when bending the hose test body along the support surface of the jig main body. To provide a hose bending jig for a hose bending test.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an up-and-down hose holder which holds an upper surface of a hose specimen when the hose specimen is bent, at the top of an arc-shaped support surface of a jig body. The gist is to provide a means.

According to the present invention, there is provided a hose holding means capable of lifting and lowering the upper surface of the hose test piece at the top of the arc-shaped support surface of the jig main body when the hose test piece is bent. When the hose specimen is bent, the uppermost point of the hose specimen does not escape outward or kink at the uppermost point, making it possible to easily perform the bending test with the specified diameter. is there.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an overall perspective view of a hose bending jig used in a hose bending test embodying the present invention. The hose bending jig 1 has a nominal diameter of 19 mm or less or a nominal diameter of 25 mm. A jig body 3 having an arc-shaped support surface 2 having a diameter twice the minimum bending radius of the body W
And a hose pressing means 4 erected on the top 2a of the arc-shaped support surface 2 of the jig main body 3.

The hose pressing means 4 presses the upper surface of the hose test piece W when the hose test piece W is bent, and has a gate-shaped support frame 5 straddling the top 2a of the arc-shaped support surface 2; A vertically movable screw member 6 suspended by being screwed into a nut 5a provided at the center of the support frame 5.
And an arc-shaped pressing member 7 attached to the lower end of the screw member 6.

An elongated hole-shaped guide portion 8 is formed in the side frame 5b of the support frame 5 in the vertical direction.
An engaging claw 7 a provided on the pressing member 7 is engaged with the guide portion 8 to guide the vertical movement of the pressing member 7. Further, a nut-shaped head 6a is attached to an upper end of the screw member 6, and a handle 6b for rotating the screw member 6 is attached to the head 6a.

A jig body 3 having the arc-shaped support surface 2
A reinforcing plate 9 is fixed at the center of the lower surface of the, and a fixing plate 11 having a bolt mounting hole 10 is horizontally mounted at the center of the lower end of the reinforcing plate 9.

Next, a description will be given of a low-temperature bending test method for the hose test piece W using the hose bending jig according to the present invention.

In the low-temperature bending test of the hose specimen W, as described above, it conforms to the test conditions of JIS K 6375. If the nominal diameter of the hose specimen is 19 mm or less, it is bent 180 degrees and the nominal diameter is 25 mm. In the case of the above, bending is performed by 90 degrees.

In a low-temperature room cooled to -40. +-. 1.degree. C., a hose bending jig 1 previously cooled is set on a fixed base such as a table, and 24.degree.
The hose test piece W left for a long time is inserted between the arc-shaped support surface 2 and the holding member 7 of the hose pressing means 4, and the center in the length direction of the hose test piece W and the top 2 a of the support surface 2 are pressed. The member 7 is lightly pressed and held.

From such a state, the test is performed by bending both ends of the hose specimen W along the supporting surface 2 having a diameter twice as large as the minimum bending radius for 10 ± 2 seconds. In the embodiment of the present invention, when the above bending test is performed, the upper surface of the maximum bending portion of the hose test piece W is pressed by the top 2a of the support surface 2 and the pressing member 7, so that the hose test piece W The point does not escape outward or the uppermost point does not kink, and the bending test with the prescribed diameter can be easily performed.

[0019]

According to the present invention, as described above, the top of the arc-shaped support surface of the jig main body is provided with a hose holding means capable of lifting and lowering the upper surface of the hose specimen when the hose specimen is bent. When bending the hose specimen along the support surface of the jig body, the hose specimen does not escape outward or kink at the highest point, and the bending test with the specified diameter is performed. There is an effect that can be easily performed.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a hose bending jig used in a hose bending test embodying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hose bending jig 2 Arc-shaped support surface 2a Top of support surface 3 Jig main body 4 Hose holding means 5 Support frame 5a Nut 6 Screw member 6a Nut-shaped head 6b Handle 7 Holding member 8 Slotted guide 9 Reinforcement plate 10 Bolt mounting hole 11 Fixing plate

Claims (3)

[Claims] 1. A hose specimen is moved along a support surface of a jig body having a diameter twice as large as a minimum bending radius of the hose specimen.
In a hose bending jig in a hose bending test in which a hose is bent by 0 degrees, a hose holding means capable of lifting and lowering an upper surface of the hose test body when bending the hose test body is provided on the top of the arc-shaped support surface of the jig body. A hose bending jig for the hose bending test provided. 2. The hose holding means includes a gate-shaped support frame straddling the top of an arc-shaped support surface, a vertically movable screw member suspended at the center of the support frame, and attached to a tip of the screw member. 2. A holding member comprising:
A hose bending jig in the hose bending test described in (1). 3. The hose bending jig in a hose bending test according to claim 1, wherein the pressing member moves up and down along guides provided on both sides of the support frame.