JP3609602B2 - Airtight test jig - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a gas tightness test jig used when performing a gas tightness test of a pipe end portion following a pipe end processing method.
[0002]
[Prior art]
In order to repair existing pipelines such as aging gas pipes and sewage pipes, for example, a reverse sealing method is known in which a pipeline is lined to repair the pipeline.
In this reverse sealing method, after the sealing material is adhered to the inner peripheral surface of the pipe, the sealing material is sealed so that no gap is generated between the end of the sealing material and the inner peripheral surface of the pipe due to curing shrinkage of the sealing material. A seal packing, a steel pipe end ring or the like is crimped to the end of the material to ensure the air tightness of the pipe end. And the airtight test which confirms the presence or absence of a leak location is implemented using the airtight test jig | tool which obstruct | occludes the pipe end part after the above-mentioned inversion seal construction method.
[0003]
As an example of the airtightness test jig used at that time, the operating screw is rotated to simultaneously expand the diameter of the two rubber packings to close the inside of the tube, and then pressurize the inside of the closed space to check for leaks. Conventionally, an airtight test jig to be examined is generally known.
As shown in FIGS. 3 (a) and 3 (b), a seal material 2, a seal packing 3, and a pipe end ring 4 are mounted in the pipe line 1 subjected to the reverse sealing method. Then, another flange portion is inserted into the pipe line 1 until the flange 54 of the airtight test jig A ′ comes into contact with the pipe end of the pipe line 1. In a state where the flange 54 is in contact with the pipe end of the pipe line 1, the operation screw main body 50 is rotated around the axial direction. Then, the shaft body 50a fitted and fixed to the operation screw main body 50 rotates, and the flange 51 which can move forward and backward along the screw portion 50b on one end side of the shaft body 50a is leftward in the figure. Moved to.
Then, the diameter of the rubber packing 55 is increased while the flange 51 moves, the outer peripheral surface of the rubber packing 55 is brought into close contact with the sealing material 2, and the flanges 52, which are integrated via the connector 59, The pressure is also transmitted to 53, and both flanges 52, 53 are also moved leftward in the figure to increase the diameter of the rubber packing 56 so as to be in close contact with the pipe 1 to close the inside of the pipe 1. It is.
When the closed space is formed in the pipe line 1, air is pumped from a connection hose (not shown) to which a compressor (not shown) connected to the connector 57 is connected in that state, and the air is supplied from the supply hole 58 into the closed space. Supply and pressurize. Then, the closed space is placed under an appropriate pressure state, and it is confirmed that the pressure does not drop by a pressure gauge (not shown) connected to the connecting hose.
[0004]
[Problems to be solved by the invention]
By the way, a step corresponding to the thickness of the seal material 2 is generated between the close contact surface of the sealing material 2 to which the outer peripheral surface of the rubber packing 55 adheres and the close contact surface of the inner surface of the pipe 1 to which the outer peripheral surface of the rubber packing 56 adheres. . For this reason, when the rubber packings 55 and 56 are simultaneously expanding in conjunction with the movement of the flange 51, one rubber packing 55 may first come into close contact with the inner surface of the pipe. Then, the movement of the flange 51 linked with the diameter expansion operation of the rubber packing 55 is stopped, so that the other rubber packing 56 cannot be brought into close contact with the inner surface of the pipe, and the airtightness in the closed space collapses and the airtight test treatment is performed. There is a possibility that the reliability of the airtight performance of the tool A ′ is lowered.
Further, the airtight performance of the airtight test jig A ′ is often greatly affected by the cleaning state of the mounting position of the airtight test jig A ′ and the state of the surface of the molded product such as the sealing material 2. For example, when wrinkles are generated at the end portion of the sealing material 2 attached to the inner surface of the pipe line 1 due to insufficient pressing force or the like, the adhesive surface of the seal packing 3 collects wrinkles of the sealing material 2 to collect the sealing material 2. There is also a possibility that an overlapping portion is formed at the end portion of this, the contact surface of the rubber packing 55 cannot be absorbed by this overlapping portion, and leakage occurs in the repaired soot line 1.
[0005]
The object of the present invention is to solve the problems in the conventional airtightness test jig described above, and can maintain airtightness even if a step is generated in the pipe, and the cleaning condition of the mounting position and the state of the surface of the molded product An object of the present invention is to provide an airtight test jig that is not affected by the above.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is used when performing an air tightness test of a pipe end portion subsequent to the pipe end processing method, and comprises two rubber packings inserted into a pipe line. the airtight test fixture having a first and second closing means for closing the conduit diametrically enlarged respectively, rotatable about a center shaft inserted along the axis of the pipe A first operating screw main body, a shaft body having one end fixed to the first operating screw body and extending in the axial direction, and a threaded portion at the other end of the shaft body fitted in the axial direction. And a first closing means comprising a first moving flange that can advance and retreat along the shaft and a first fixed flange that is slidably contactable with the shaft, and is fitted to the outer peripheral surface of the first operating screw body. a second actuating screw body that can be moved forward and backward in the axial direction Te, Do contact one end surface and sliding the second operating screw body Luo and the axial direction to allow forward and backward movement second mobile flange, the shaft body slidably a base end fixed second which is fixed to one end of the spacer which always sliding on said first actuating screw body Ri Do a flange, the second fixing flange is provided with a second closing means are integrated through the arranged connecting member about said first fixed flange and the shaft body, moving each Each rubber packing is individually expanded and contracted by sandwiching a rubber packing that can be expanded and contracted between the flange and each fixed flange, and individually rotating the first operating screw body and the second operating screw body. It is characterized by letting.
[0007]
According to a second aspect of the present invention, in the hermetic test jig according to the first aspect, at least one annular groove is provided in a circumferential direction of the outer peripheral surface of each rubber packing.
[0008]
[Action]
In the first aspect of the invention, since the two rubber packings can be individually expanded / contracted by the respective closing means, each rubber packing is expanded in diameter even if a level difference due to repair occurs in the pipe. Ensure close contact with the inside of the pipeline. As a result, airtightness in the pipe line can be maintained.
[0009]
In the invention according to claim 2, since the wrinkles and the like generated on the surface of the molded product can be absorbed by the annular groove provided on the adhesive surface of the rubber packing, the degree of cleaning of the contact position of the rubber packing and the surface of the molded product can be absorbed. The airtight performance can be improved regardless of the state.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described below with reference to the illustrated embodiments. In addition, the same code | symbol is attached | subjected to the thing similar to a prior art example.
First, FIG. 1 is a schematic diagram for explaining an airtight test jig A, and one end of a shaft body 6 is fixed to a base end portion 5a of a first operation screw main body 5 that is rotatable in the axial direction. The other end of the shaft body 6 is provided with a threaded portion 6a, and a moving flange 7 is disposed that can move forward and backward in the axial direction while being fitted to the threaded portion 6a. Further, the shaft body 6 has a fixed flange 8 that can be slidably contacted with the shaft body 6, and a spacer 9 that is slidably contacted with the outer peripheral surface of the shaft body 6 and that is slidably contacted with one side surface of the first operation screw body 5. Are arranged to form one closing means.
A fixing flange 10 is fixed to the other end surface of the spacer 9 with a bolt 16, and the fixing flange 10 is integrated with the fixing flange 8 via a connecting member 11. The fixed flange 10 is provided with a supply hole 10a for supplying air.
And the 2nd operation screw main body 12 fitted to the outer peripheral surface of the base end part 5a of the said 1st operation screw main body 5 so that it can rotate freely and can move to an axial direction is arrange | positioned. One end surface of the second operation screw main body 12 is provided with a moving flange 13 which is in sliding contact with the one end surface and can move forward and backward in the axial direction while sliding on the outer peripheral surface of the spacer 9. Forming the closing means.
A connecting tool 57 is attached to the moving flange 13. This connector 57 is a connector with a connection hose (not shown) that connects a pressure gauge for airtightness test (not shown), and air pumped from a compressor (not shown) connected to this connection hose is connected to the connector 57. Is passed through a part of the airtight test jig A and supplied from the supply hole 10a to a closed space described later.
An expandable / contractible rubber packing 14 is disposed between the moving flange 7 and the fixed flange 8, and an expandable / contractible rubber packing 15 is disposed between the moving flange 13 and the fixed flange 10. ing. A plurality of annular grooves 14 a are provided in the circumferential direction of the outer peripheral surface of the rubber packing 14. At this time, you may make it provide an annular groove also in the circumferential direction of the outer peripheral surface of the rubber packing 15.
In the figure, reference numerals 5a and 12a denote operation handles.
[0011]
Next, the operation state of the airtight test jig A will be described. FIG. 2A shows a state in which the airtight test jig A configured as described above is inserted into the pipe line 1. The rubber packings 14 and 15 are both reduced in diameter with a sufficient space between the moving flange 7 and the fixed flange 8 and between the moving flange 13 and the fixed flange 10 . The outer diameters of the moving flange 7, the fixed flange 8 and the rubber packing 14 are formed such that they can be inserted into the pipe 1 through the seal packing 3, and the moving flange 13, the fixed flange 10 and the rubber packing 15 are inserted. The outer diameter is formed to be slightly smaller than the inner diameter of the pipe 1.
[0012]
FIGS. 2B and 2C show a state in which the periphery of the seal packing 3 is closed using the airtight test jig A. FIG. First, the first operation screw body 5 is rotated around the axis. Then, the flange 7 fitted to the threaded portion 6a of the shaft body 6 is sent out in the left direction of the shaft center in the figure. At that time, since the spacer 9 that is always in sliding contact with the one end surface of the first operation screw main body 5 is interposed, the fixed flange 8 cannot move, and therefore the distance between the moving flange 7 and the fixed flange 8 is narrowed. As a result, only the rubber packing 14 is compressed, the outer diameter is expanded, and the space in the pipe line 1 can be closed by closely contacting the inner peripheral surface of the sealing material 2 (see FIG. 2B).
At this time, since a plurality of annular grooves 14a are formed in parallel in the circumferential direction on the outer peripheral surface of the rubber packing 14 that is in close contact with the sealing material 2, the annular groove 14a is formed on the outer peripheral surface. Thus, wrinkles at the end of the sealing material 2 are absorbed by the annular groove 14a, and the airtightness of the end of the sealing material 2 can be further improved.
[0013]
Next, in the above-described state, the first operation screw body 5 is supported and fixed so as not to rotate, and the second operation screw body 12 is rotated around the axis. Then, the second operation screw main body 12 starts to rotate in the right direction of the axis in the drawing. Then, the moving flange 13 slidably in contact with the second operation screw main body 12 is also translated in the right direction of the axis in the drawing. At this time, since the spacer 9 that is always in sliding contact with the one end surface side of the first operation screw main body 5 is interposed, the fixed flange 10 cannot move, and thus the distance between the moving flange 13 and the fixed flange 10 is narrowed. As a result, only the rubber packing 15 is compressed, the outer diameter is expanded, and the space inside the pipe line 1 can be closed by closely contacting the inner peripheral surface of the pipe line 1 (see FIG. 2C).
As described above, since the two rubber packings can be individually expanded / contracted by the respective closing means, the rubber packings 14 and 15 are expanded in diameter even if there is a level difference due to repair in the pipe 1. By tightly adhering to the pipe line 1 or the sealing material 2, the air tightness in the pipe line 1 can be maintained. Thus, the rubber packings 14, 15 is brought into close contact with each other to close the surrounding space including the seal packing 3 to form a closed space. In this state, the connecting hose and the connecting tool 57 are connected, air is pumped from the compressor, and a part of the airtight test jig A is passed through to supply air from the supply hole 10a into the closed space and pressurize. . And it can confirm that the fall of a pressure does not arise with the pressure gauge which does not show the obstruction | occlusion space under moderate pressurization, and was connected with the connection hose.
[0014]
【The invention's effect】
As is clear from the above embodiments, in the invention described in claim 1, since the two rubber packings can be individually expanded / contracted by the respective closing means, there is a step due to repair in the pipeline. Also, each rubber packing expands in diameter and securely adheres to the inside of the pipeline. As a result, airtightness in the pipe line can be maintained.
[0015]
According to the second aspect of the present invention, wrinkles and the like generated on the surface of the molded product can be absorbed by the annular groove provided on the outer peripheral surface of the rubber packing. It becomes difficult to be influenced by the state of the surface, and the airtightness performance can be further improved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view illustrating an airtight test jig of the present invention.
FIG. 2 is a partial cross-sectional view for explaining the operation when the airtight test jig of the present invention is inserted into a pipe line.
FIG. 3 is a partial cross-sectional view for explaining an operation when a conventional airtight test jig is inserted into a pipeline.
[Explanation of symbols]
A Airtight test jig 1 Pipe line 2 Sealing material 3 Seal packing 4 Pipe end ring 5 First operation screw body 6 Shaft body 6a Screw portion 7 Moving flange 8 Fixed flange 9 Spacer 10 Fixed flange 12 Second operation screw body 13 Moving flange 14 Rubber packing 14a Annular groove 15 Rubber packing

Claims (2)

Be those used when performing the airtightness test tube end subsequent to the tube end processing method, first for closing the conduit diametrically enlarged two rubber packing inserted into conduit respectively And an airtight test jig provided with the second closing means,
A first operating screw main body that is inserted along the axial center of the pipe line and is rotatable about the axial center, and a shaft body having one end fixed to the first operating screw main body and extending in the axial direction When first made of a first and a moving flange freely advance and retreat along the axial direction is fitted to the threaded portion of the other end of the shaft, and the shaft body and slidable contact first fixing flange With a closing means of
A second actuating screw body that can be moved forward and backward in the axial direction fitted on the outer peripheral surface of the first operating screw body, move forward and backward in the axial direction while contacting one end face in sliding the second operating screw body a second mobile flange possible, Ri Do and a second fixing flange which the shaft member can slide on a base end side is fixed to one end of the spacer which always sliding on said first actuating screw body, said The second fixing flange includes a second closing means integrated with the first fixing flange via a connecting member disposed around the shaft body ,
The rubber packings that can be expanded and contracted are sandwiched between the moving flanges and the fixed flanges, and the first and second operating screw bodies are individually rotated to individually separate the rubber packings. An airtight test jig characterized in that it is expanded and contracted. 2. The airtight test jig according to claim 1, wherein at least one annular groove is provided in a circumferential direction of an outer peripheral surface of each rubber packing.

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