JPH0420133B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tube leak test device.

When pipes are manufactured from cast iron or the like, there is a possibility that cracks, pinholes, etc. may occur in the product in very rare cases, and it is necessary to inspect these and remove defective products. Among these, it was proposed in 1983 that it was possible to inspect even small nests such as pinholes.
There is one disclosed in No. 28657 (see Utility Model Application Publication No. 59-135451). That is, a hood that covers the outer periphery of the tube in the length direction, a gas injection device that injects fluorocarbon gas into the inside of the tube from an opening at the end thereof, and a system that detects leakage of fluorocarbon gas from the inside of the tube into the hood. A gas detection device is installed to detect nests. However, in the above-mentioned method, it is necessary to carry the tube into and out of the hood, so there is a problem that this carrying in and out operation becomes difficult.

Therefore, an object of the present invention is to make it possible to easily carry a tube into and out of a hood.

To achieve this object, the present invention provides a retractable hood that covers the length of a horizontal pipe, a gas injection device that injects fluorocarbon gas into the interior of the pipe from an opening at the end of the pipe, and an interior of the pipe. In a pipe leak test device that has a gas detection device that detects leakage of fluorocarbon gas from the inside of the hood into the hood, a skid rail that can transport the pipe toward the inside of the hood is provided, and a skid rail is provided that can transport the pipe toward the inside of the hood. A pair of locking levers are provided that are swingable and can be switched between a locking position where the locking levers can be locked on both sides of the pipe on the skid rail and a retracted position above the pipe; A lever moving device is provided for moving between a tube standby position in front of the opening/closing hood and a test position inside the hood.

Therefore, since the tube is moved while being held by the locking lever, the tube can be reliably transported from the standby position to the test position, and the locking lever can be switched between the locking position and the retreat position. Therefore, interference between the locking lever and the pipe can be prevented when the locking lever is returned to the standby position and is locked to a new pipe.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIG. 1, reference numeral 1 denotes a pipe to be inspected, which is made of cast iron and has a socket 2 and an insertion port 2, and is arranged horizontally. Tube 1 is
The outer periphery of the socket 2 is covered by a retractable hood 4 extending from the socket 2 to the socket 2. This opening/closing type hood 4 is of a vertically split type, and includes a plurality of mortar-shaped lower fixed hoods 5 in the length direction, and an upper slide cover 6 with a chevron-shaped cross section that can be moved toward and away from the lower fixed hood 5 in the vertical direction. It is made up of. 7 is a cylinder device that raises and lowers the upper slide cover 6. 8 is a horizontal holding device for the upper slide cover 6, and as shown in FIG.
a, 11b, and a pair of pinions 1 that mesh with the racks of the bars 11a, 11b separately and mesh with each other.
2a and 12b. Reference numeral 13 designates a pair of tube support rollers that support the tube 1 movably in the axial direction within the openable hood 4, and a pair of tube support rollers are provided in the length direction of the hood 4.

The transport device 15 for transporting the tube 1 to the test position 14 in the hood 5 will be described. Figure 2~
In FIG. 3, reference numeral 16 denotes a pair of skid rails that horizontally support the tube 1, and are provided so as to be inclined downward with respect to the transport direction 17. Test position 1
4, the skid rail 16 and the tube receiving roller 13
The tube 1 can be transferred between the two. Further, on the near side of the test position 14, a stopper 19 is provided which is moved in and out of the upper surface of the skid rail 16 by a cylinder device 18 and is engaged with the pipe 1, thereby forming a pipe standby position 20.

Above the tube standby position 20, a lever moving device 2 is provided.
1 is provided. In this lever moving device, 22A and 22B are a pair of parallel links provided in the length direction of the tube 1, and their upper ends are attached to brackets 23A and 23B erected on the machine frame 9. Both parallel links 22A, 22B are connected by a connecting member 24, and this connecting member 2
4 is connected to the cylinder device 25 from the machine frame 9, so that the tube 1 can be integrally swung in the transport direction 17. 26 is a stopper. A lower frame member 27 is passed between the lower ends of both parallel links 22A, 22B, and this lower frame member 27 includes:
Support members 28A, 28B, which are movable between the tube standby position 20 and the test position 14 by the swinging of the parallel links 22A, 22B,
It protrudes from the vicinity of 2B.

Each support member 28A, 28B supports a rotation shaft 29A, 29B as a horizontal axis, and each rotation shaft 29A, 29B has a roller 30 at the tip that can come into contact with the tube 1, and A pair of locking levers 31a and 31b that can be locked are attached to both sides of the lever. On the other hand, both rotation shafts 29A, 29B
is extended to the inside of the lower frame member 27, and this lower frame member 2
Lever 32A, 32B that can rotate integrally with each rotation shaft 29A, 29B at position 7, and lower frame member 27
Both levers 32A and 32B are interlocked with each other by a connecting bar 33 that connects them to each other above, and can be rotated at the same time by a cylinder device 34 that is built in the lower frame member 27 and reciprocates the connecting bar 33. . As a result, the locking lever 31
a, 31b are configured to be switchable between a locking position 35 where they can be locked on both sides of the tube 1 and a retracted position 36 above the tube 1.

Inside the retractable hood 4, the pipe 1 is supported in a sealed state by an inlet-side sealing device 37 and an inlet-side sealing device 38, which serve as gas injection devices. Fourth
As shown in the figure, in the socket-side sealing device 32, numeral 39 is an socket-side communication pipe that communicates with the inside of the socket 3 via a sealing material 40, and includes a pipe line 41, a funnel-shaped connecting pipe 42, It has a cap part 43 that covers the outer periphery of the end of the socket 3. An annular recess 44 is formed on the inner periphery of the cap portion 43.
4 and the outer periphery of the cap portion 43 are communicated through a through hole 45. A cavity 46 is formed on the outer periphery of the connecting pipe 42 , and the cavity 46 and the annular recess 44 communicate with each other through the communication hole 42 . Further, an external communication pipe 48 is connected to the cavity 49 .

In the socket side sealing device 38, 49 is the pipe line 5
0, a connecting pipe 51, and a cap portion 52, and communicates with the inside of the socket 2 via a sealing material 53. 54 is an annular recess, 55 is a through hole, 56 is a cavity, 57 is a communication hole, and 5
Reference numeral 8 denotes an external communication pipe, and the configuration thereof is similar to that of the inlet side sealing device 38. Further, as shown in FIG. 1, the socket side sealing device 38 is configured to be movable on the bed 59 of the machine frame 9 in the length direction of the tube 1. 60 is a feeding device for moving the socket side sealing device 38, and 61 is its operating handle.

The structure around the retractable hood 4 will be explained. Above the pipe 1 inside the upper slide cover 6, an air pipe 62 and a downward air nozzle 63 communicating with the air pipe 62 are provided. Airflow 64 (Fig. 5~
(see Figure 6).

An exhaust port 65 is formed at the lower end of the lower fixed hood 5, and a gas detection device 66 such as a halogen leak detector is provided at the exhaust port 65. Further, below the lower fixed hood 5 is a lower exhaust duct 67 that sucks exhaust air from the exhaust port 65.
is provided. 68 is a blower. As shown in FIGS. 5 and 6, the exhaust port 65 and the lower exhaust duct 67 are connected to each other by an ejector device 69, and this ejector device 69 can be opened and closed by a valve body 71 operated by a cylinder device 70. It is composed of

The above-mentioned tube receiving roller 13 is connected to the cylinder device 72.
It is configured to be able to rise and fall within the hood 4 by the action of
an upper position supporting the tube 1 as shown in FIG.
As shown in FIG.
and a lower position which is separated when the tube 1 is opened when supported by the socket-side sealing device 38. 73 is a closing plate that can be raised and lowered together with the tube receiving roller 13;
A hole 74 in a portion of the lower fixed hood 5 provided for raising and lowering the tube support roller 13 can be closed as the tube receiving roller 13 descends.

Explain the leak test method. First, lower the upper slide cover 6 and close the retractable hood 4.
The support members 28A, 28 are moved by the lever moving device 21.
B to the tube standby position 20, and then press the locking lever 31.
a and 31b are raised to the retracted position 36, and in this state, the pipe 1 is rolled on the skid rail 16, stopped by the stopper 19, and placed on standby at the pipe standby position 20. Next, as shown by the imaginary lines in FIG. 3, the locking levers 31a and 31b are lowered to the locking position 36 to engage the pipe 1, and at the same time, the upper slide cover 6 is raised to open the retractable hood 4. After this, the lever moving device 21 is operated to move the support member 28
A, 28B are sent to the test position 14. Then, since the tube 1 is held between the locking levers 31a and 31b, the tube 1 is also placed in the test position 1.
4, and is supported by the tube receiving roller 13 in the raised state. This state is shown by the solid line in FIG.

If the tube 1 is supported by the tube support roller 13,
The locking levers 31a and 31b are raised to the retracted position 36, the lever moving device 21 is returned to the pipe standby position 20 with the interference with the pipe 1 prevented, and the support member 28
Take A and 28B out of the openable hood 4.

Next, the feeding device 60 is operated by the operation handle 61, the socket-side sealing device 38 is brought into contact with the socket 2 of the pipe 1, the pipe 1 is pushed and moved on the pipe receiving roller 13, and the socket 3 is moved into the socket. The side seal device 37 is pressed. As a result, the tube 1 is connected to both sealing devices 37, 3.
It is supported in a sealed state at 8. At this point, the tube receiving roller 13 is lowered to separate it from the tube 1. Further, the upper slide cover 6 is lowered to close the retractable hood 4.

Next, the inside of the tube 1 is purged with air. This is done by flowing purge air into the tube 1 through the socket-side communication pipe 49 of the socket-side sealing device 38 and the insertion-side communication pipe 39 of the socket-side sealing device 38.
Further, the inside of the hood 4 is purged by generating an air flow 64 from an air nozzle 63. This airflow 64 descends along the outer periphery of the pipe 1, is sucked into the lower exhaust duct 67 through the exhaust port 65 of the lower fixed hood 5, and is discharged. At this time, as shown in FIGS. 5 and 6, the ejector device 63 is opened, and the ejector device
The outside air 76 in the vicinity of 9 is also exhausted all at once. According to experiments conducted by the present inventors, when the ejector device 69 is activated in this way, air can be discharged uniformly over the length of the lower fixed hood 5, and when the ejector device 69 is not activated, the air can be discharged from the exhaust port. A result has been obtained that only air near the upper part of 65 can be discharged. The valve body 71 is closed only when necessary.

When the purge is completed, the supply of air into the tube 1 is stopped, and Freon gas is supplied into the tube 1 while continuing to blow air from the air nozzle 63. That is, for example, the conduit 41 of the inlet side sealing device 32
is closed with a valve or the like, and a mixed gas of air and chlorofluorocarbon is pressurized and supplied into the pipe 1 from the receiving side car passage pipe 49.

If there is a pinhole or the like in the pipe 1, fluorocarbon gas leaks out of the pipe through the pinhole, rides on the airflow 64 from the air nozzle 63, and enters the lower fixed hood 5.
When passing through the exhaust port 65, the gas detection device 6
Detected by 6. At this time, since a plurality of lower fixed hoods 5 are provided in the length direction of the pipe 1,
The approximate position of the pinhole etc. can be detected. In addition, as described above, the tube receiving roller 13
Since the tube receiving roller 13 is lowered and separated from the tube 1, the tube receiving roller 13 prevents pinholes from being blocked and cannot be detected.

Socket 2, insertion port 3 of pipe 1 and each sealing device 37, 3
8 is sealed by sealing materials 40 and 53, but it is not necessarily perfect, and if Freon gas leaks from this sealing part, there is a possibility that the detection results will be adversely affected. Therefore, the external communication pipe 48,
58 to create a negative pressure inside each cavity 46, 56. Then, the cavities 46, 56 pass from the outer periphery of the cap parts 43, 52 through the through holes 45, 55, the annular recesses 44, 54, and the communication holes 47, 57.
Inward air currents 77, 78 are generated. Therefore, even if fluorocarbon gas were to leak from between the sockets 2 and 3 and the sealing materials 40 and 53, the leaked gas would flow from the annular recesses 44 and 54 to the communication holes 47 and 57. It is discharged from external communication pipes 48, 58 via cavities 46, 56. Therefore, there is no risk that the leaked gas will be detected by the gas detection device 66, and an adverse effect on the test results will be prevented.

The gas that has passed through the exhaust port 65 is transferred to the lower exhaust duct 67.
is sucked into the insertion port and the receptacle side sealing device 37,
The gas is collected together with the gas sucked into the external communication pipes 48 and 58 of 38. Further, when the inspection is completed, the fluorocarbon gas in the pipe 1 is recovered from the receiving side communication pipe 49.

Thereafter, the upper slide cover 6 is raised to open the hood 4, the tube support roller 13 is raised and the tube 1 is supported by the tube support roller 13 again, and the socket side sealing device 38 is moved away from the socket 2. By this time, as shown in FIG. 3, the pipe 1 to be inspected next time is carried into the pipe standby position 20 and held between the locking levers 31a and 31b. Then, in the same manner as described above, the tube 1 to be inspected next time is moved to the test position 14, and at the same time, the inspected tube 1 is pushed out of the open/close type hood 4 by the locking lever 31b.

As described above, according to the present invention, since the tube is moved by being held between the locking levers, the tube can be reliably transported from the standby position to the test position, and the locking lever can be moved between the locking position and the retreat position. Since the locking lever is configured to be switchable between the two, it is possible to prevent interference between the locking lever and the pipe when returning the locking lever to the standby position and locking the locking lever to a new pipe.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a front view of the entire device, FIG. 2 is a front view showing an enlarged conveyance device, FIG. 3 is a left side view of FIG. 2, and FIG.
The figure is a cross-sectional view showing the sealing device on the socket side and the socket side, FIG. 5 is a cross-sectional view showing an enlarged lower fixed hood, and FIG. 6 is a cross-sectional view taken in FIG. DESCRIPTION OF SYMBOLS 1...Pipe, 4...Opening/closing type hood, 14...Test position, 16...Skied rail, 20...Tube standby position, 21...Lever moving device, 28A, 28
B... Support member, 29A, 29B... Rotating shaft (horizontal axis), 31a, 31b... Locking lever, 35
... Locking position, 36 ... Retreat position, 37 ... Inlet side sealing device (gas injection device), 38 ... Inlet side sealing device (gas injection device), 66 ... Gas detection device.

Claims (1)

[Claims] 1. A retractable hood that covers the length of a horizontal pipe, a gas injection device that injects fluorocarbon gas into the interior of the pipe from an opening at the end of the pipe, and a system that prevents the leakage of fluorocarbon gas from the inside of the pipe into the hood. A pipe leak test device having a gas detection device for detecting gas, wherein a skid rail capable of transporting the pipe toward the inside of the hood is provided, the skid rail is swingable about a horizontal axis perpendicular to the pipe axis, and the skid rail A pair of locking levers that can be switched between a locking position on both sides of the upper tube and a retracted position above the tube are provided, and the locking levers are placed in front of the opening and closing type hood when the tube is in standby position. A pipe leak test device characterized in that it is provided with a lever moving device for moving between the test position and the test position in the hood.