JPH05180726A - Inspection device of leakage of pressure of pipe - Google Patents

Abstract

PURPOSE:To inspect accurately a leakage of pressure of a pipe pressed into a workpiece. CONSTITUTION:A tubular seal member 7 fitted to a first support plate 3 is joined airtightly to the upper end part of a pipe (p) and an air supply pipe 15 passed through the seal member 7 is made to pierce the pipe (p) through and fitted airtightly in a fit hole (a) of a workpiece W. Moreover, a cap member 21 is joined airtightly to the rear end of the seal member 7. In this state, air is supplied into the fit hole (a) and a leakage of pressure of the pipe pressed into the workpiece is inspected from the state of the leakage of the air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting pressure leakage of a pipe press-fitted into a work.

[0002]

2. Description of the Related Art In order to inspect a pipe for pressure leakage into a work, usually, the lower surface of the work is sealed and the rim of the pipe is sealed with a sealing member, and then the pipe is inserted into the pipe. Air was supplied inside, and the leak condition was read to check for pressure leak between the work and the pipe. However, in such an inspection method, a seal member for sealing the lower surface of the work is required separately, and when the seal member for sealing the rim of the pipe is deteriorated or deformed, the air is generated from this portion. As a result, there is a problem that the reliability of the pressure leak test is impaired.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to:
It is an object of the present invention to provide a new pipe pressure leak inspection device that can reliably inspect the pressure leak of a pipe pressed into a work without requiring a sealing member for sealing the lower surface of the work.

[0004]

That is, the present invention provides a pressure leak inspection device for a pipe to achieve the above object,
A tubular seal member whose tip portion is airtightly joined to the upper end portion of the pipe press-fitted into the fitting hole of the work, and a first support body which can loosely hold this seal member in the radial direction and which is movable back and forth. And a cap that is airtightly inserted into the inside of the fitting hole through the pipe and has an air supply port at the tip and a cap that is airtightly joined to the upper end of the seal at the rear end. The air supply member is provided, and the second support body that holds the air supply member loosely in the radial direction is movable back and forth.

[0005]

EXAMPLES The examples shown below will be described below. The drawings show a pressure leakage device according to an embodiment of the present invention.

In the machine frame indicated by reference numeral 1 in the drawing, a first support plate 3 which moves up and down along a guide rail 2 thereof is driven by a first lift cylinder 6 on the machine frame 1 to move up and down. Is attached via a rod 4 to obtain
Several tubular sealing members 7 ... That seal the pipes p press-fitted into the work W from the outside are attached according to the number of pipes p.

The cylindrical seal member 7 seals the upper outer peripheral surface of the pipe p with a packing 8 fitted in the lower end portion of the inner surface thereof. The seal member 7 has a flange portion 9 provided at the center. A small gap δ is held between the support plate 3 and the support plate 5 fixed to the lower surface of the support plate 3 so as to be immovable in the longitudinal direction and slightly movable in the radial direction.

Reference numeral 11 denotes a second support plate which is mounted above the first support plate 3 so as to be vertically movable, and is mounted on the second lifting cylinder 13 on the machine casing 1 via a rod 12. An air supply pipe 15 that is inserted into the pipe p is attached to the support plate 11 so as to penetrate each seal member 7.

The air supply pipe 15 is inserted through the seal member 7 with a slight gap δ so as to be able to move slightly in the radial direction, and a head 16 which is in close contact with the inner surface of the pipe p is provided at the tip thereof. A small hole 17 for supplying air is provided in the fitting hole a of the work W.

This air supply pipe 15 is provided with an air hose 20 connected to an air supply source (not shown) and the second support plate 1
The cap member 21 is fixed to No. 1 and covers the upper end of the seal member 7 at the upper end of the air supply pipe 15 with the air supply pipe 15 inserted into the inside of the fitting hole a of the work W.
Are integrally attached.

Reference numeral 18 in the drawing denotes a packing attached to the tip of the air supply pipe 15 so as to maintain airtightness between the fitting hole a and the air supply pipe 15, and 22 denotes a seal member. 7 shows the packing for keeping the space between the outer peripheral surface of 7 and the inner peripheral surface of the cap member 21 airtight.

In the apparatus thus constructed, when the work W to be inspected for pressure leak is placed on the jig 25, the first elevating cylinder 6 lowers the first support plate 3, A cylindrical seal member 7 provided with a slight slack in the radial direction is fitted to the upper end of the pipe p so as to fit, and a packing 8 provided on the inner surface thereof joins the two in an airtight manner.

After the above connection is completed, the second elevating cylinder 13 is then actuated to lower the second support plate 11 connected via the rod 12 and the air supply pipe 15 loosely inserted into the seal member 7. Is moved slightly in the radial direction and aligned with the pipe p, and the tip of the work W
The fitting hole a and the air supply pipe 15 are air-tightly joined with each other with the packing 18 attached to the tip end.

At the same time, the cap body 21 provided on the upper end of the air supply pipe 15 is also fitted to the upper end of the seal member 7, and is hermetically connected to the seal member 7 via the packing 22 provided on the inner surface thereof. The fitting hole a of the work W, the air supply pipe 15, and the seal member 7 are hermetically coupled to each other through the packings 18, 8, and 22 provided on the air supply pipe 15, the seal member 7, and the cap 21, respectively. ..

Therefore, in this state, if air is injected from the air supply pipe 15 into the fitting hole a and held in that state,
The pressure leak between the fitting hole a and the pipe p can be reliably detected.

[0016]

As described above, according to the present invention, the seal member is airtightly joined to the upper end portion of the pipe, and the air supply member is airtightly inserted into the fitting hole of the work through the seal member. Since the cap member is inserted and sealed and the cap member is hermetically joined to the rear end of the seal member, the pipe and the air supply member can be hermetically sealed without sealing one surface of the work or the rim of the pipe. The pressure leak of the pipe can be accurately detected by holding it.

Moreover, since the seal member and the air supply member are loosely supported in the radial direction by the first support member and the second support member, respectively, the seal member and the pipe can be separated from each other even if there is some positional deviation. And the air supply member can be easily inserted into the pipe, and this kind of inspection work can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus showing an embodiment of the present invention.

FIG. 2 is a front view of the same device.

FIG. 3 is a cross-sectional view of a main part of the same apparatus shown in a pressure leak inspection state of a pipe.

[Explanation of symbols]

 3 1st support plate 7 Cylindrical seal member 11 2nd support plate 15 Air supply pipe 21 Cap member

Claims (1)

[Claims] 1. A tubular seal member, the tip of which is airtightly joined to the upper end of the pipe with respect to the pipe press-fitted into a fitting hole of a work; and a movable back and forth that loosely holds the seal member in the radial direction. Na first
And a head having an air supply port at the tip, the tip being airtightly inserted into the inside of the fitting hole through the pipe.
A work, which comprises an air supply member having a cap portion which is airtightly joined to the upper end portion of the seal portion at a rear end thereof, and a second support body which is loosely held in the radial direction of the air supply member and is movable back and forth. Pipe pressure leak inspection device for inspecting pipe for pressure leak.