JPH0712945U - Weld vacuum tester - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an improved weld vacuum tester capable of performing a vacuum test on a weld between side plates of a tank. [Structure] A housing 4 which is detachably mounted on the welded portion 3 to be inspected so as to cover it in an airtight manner.
And a suction pipe 5 connected to the housing 4 for sucking the atmosphere inside the housing 4 into a vacuum and inspecting for the presence of gas leaking from the welding portion 3. One end is connected to the suction pipe 5 located on the downstream side in the suction direction, and the other end adsorbs the adsorption pipe 11 that adsorbs in the vicinity of the welding portion 3, and the adsorption pipe 1.
1, a fulcrum portion 12a is supported, and a lever member 12 for supporting the housing 4 by pressing the housing 4 onto the welded portion 3
It is equipped with and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weld vacuum tester, and more particularly to a weld vacuum tester improved to perform a true-air test of a weld between side plates of a tank.

[0002]

[Prior art]

 In general, a liquid storage tank such as a tank is formed into a container shape by welding a plurality of plate materials constituting the same to each other. Since it is necessary to keep the welded part of the plate materials air-tight or liquid-tight, and it is necessary to inspect for the presence of cracks inside and pinholes, etc., a leak test is performed after welding. As one method, there is a vacuum test in which the welded part is covered in a vacuum state and leaks are observed.

As shown in FIG. 2, a test apparatus 1 used for such a vacuum test is attached and detached on a welded portion 3 or a welded line portion of plate materials 2 to be inspected so as to hermetically cover the welded portion 3 or welded line portion. It is mainly composed of a housing 4 which is freely attached, and a suction tube 5 which is connected to the housing 4 and sucks the atmosphere inside the housing 4 into a vacuum to inspect for the presence of gas leaking from the welding portion 3.

The housing 4 is a transparent resin box whose one surface is open. During the test, the open portion 4 b is pressed against the plate material 2 with the welding part 3 to the plate material 2 facing. In the illustrated example, the plate members 2 are overlapped with each other and fillet welded, but the side plates 4a of the housing 4 facing each other are provided with the peripheral edge portions 6 of the housing 4 while avoiding the steps of the welded parts 3. A semi-circular cutout portion 7 is provided so as to be sufficiently closely attached to the plate member 2. A transparent seal sheet 8 is attached to the outer peripheral portion of the housing 4 with bolts and nuts 9 so as to cover it with room, and when the inside of the housing 4 is sucked, the seal sheet 8 is also sucked together, so that the housing The gap between the peripheral edge portion 6 and the cutout portion 7 of the plate 4 and the plate material 2 and the welded portion 3 is reliably sealed.

One end of the suction pipe 5 is inserted into the housing 4, and the other end thereof is extended in the direction of separating the plate member 2 and connected to the ejector pipe 6.

When air as a driving fluid is sent into the ejector pipe 6, the inside air of the housing 4 becomes a driven fluid and is sucked into a vacuum state. During the vacuum test, a foaming liquid such as soap water was previously applied to the welded part 3, and when the inside of the housing 4 was evacuated, the presence or absence of foaming from the welded part 3 was visually inspected from outside the transparent housing 4. It is supposed to do. By the way, the internal pressure of the housing 4 and the suction tube 5 during the test is set to about -400 mmHg.

Reference numeral 10 is a valve provided in the ejector pipe 6. Further, the leak test of the welded portion 3 is performed after the grinder finish is applied after welding.

[0008]

[Problems to be solved by the device]

 By the way, especially in the case of a bottomed cylindrical tank, the above-mentioned plate materials are a bottom plate, side plates (liner plates) and roof plates. Conventionally, when performing a leak test of a welded portion between these plate materials, the following problems have been encountered. there were.

When performing a vacuum test using the above-described test apparatus, it is necessary to press the test apparatus against the plate material and bring it into close contact. The bottom plate and the roof plate are tested from above, so the posture is downward and it is easy to press.However, the side plates are pressed from the side of the gondola, and the gondola is suspended by wires or chains. Therefore, the test device could not be used for the vacuum test of the side plate because the test device was moved away from itself due to the reaction of pressing and could not be pressed enough to make the test device fully adhere. Also, it was difficult to support this test equipment because it was relatively heavy.

Therefore, the side plate is subjected to a leak test by another test method, for example, an ammonia leak test (color check). This is a method of inspecting for leaks by adhering a test strip or test solution that changes color in response to ammonia to the weld, feeding ammonia gas to the back side of the side plate at a specified pressure, and observing the discoloration of the test strip or test solution. Is. Although this method can certainly perform a leak test, this method is less reliable than the vacuum test described above, and there are drawbacks such that the test cannot be performed unless there is a gap on the back side of the side plate. is there.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to provide an improved weld vacuum tester capable of performing a vacuum test on a weld between side plates of a tank.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a housing which is detachably attached to a welding portion to be inspected so as to cover it in a hermetic manner, and a housing which is connected to the housing and sucks an internal atmosphere of the housing to a vacuum. In a vacuum tester for welded parts, which has a suction pipe for inspecting for gas leaking from the pipe, one end is connected to the suction pipe located downstream of the housing in the suction direction, and the other end is connected to the suction pipe. An adsorption pipe that adsorbs the vicinity of the welded portion, and a lever member whose fulcrum is supported by the adsorption pipe to press and support the housing on the welded portion are provided.

Further, a stop valve is provided on the suction pipe on the housing side from the connection position of the suction pipe and the suction pipe to close the suction pipe before sucking the inside of the housing to suck the suction pipe in advance. It is a thing.

[0014]

[Action]

 With the above structure, the housing is mounted on the welded portion, and the suction pipe is sucked to adsorb the suction pipe in the vicinity of the welded portion, and the lever member is used to press the housing on the welded portion with the suction pipe as a fulcrum. As a result, the housing can be brought into close contact with the pressing plate member with a small force, and the test device can perform the vacuum test at the welded portion between the side plates of the tank.

[0015]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, in the test apparatus 1 according to the present invention, in addition to the conventional test apparatus 1, one end is connected to a substantially middle portion of the suction pipe 5 located downstream of the housing 4 in the suction direction. Now, the other end of the adsorption pipe 11 adsorbs the plate 2 in the vicinity of the welded portion 3 of the plates 2, and the fulcrum 12a is supported by the adsorption pipe 11 to press the housing 4 onto the welded part 3 to support it. A lever member 12 for this purpose and a stop valve 13 connected to the suction pipe 5 on the housing 4 side of the connection position between the suction pipe 5 and the suction pipe 11 are provided.

The suction pipe 11 is formed so as to extend vertically to the suction pipe 5 and then bend at a right angle in the middle toward the plate material 2 direction, and the tip end thereof has a suction portion 1 for adsorbing to the plate material 2. 4 is formed. The suction portion 14 is positioned so as to be flush with the peripheral edge portion 6 of the housing 4. In the illustrated example, the suction portion 14 is formed by adhering a rubber trumpet suction cup 14a to the tip of the suction pipe 11. It

The lever member 12 has a bracket 15 fixed to the bent portion 11 a of the suction pipe 11 sandwiched at one end as a fulcrum portion 12 a, extends along the suction pipe 11 in the suction pipe 5 direction, and has the other end. One end is sandwiched between a pair of extension members 17 fixed so as to sandwich the suction tube 5 and a mounting portion 17a of the extension member 17 protruding in the direction opposite to the suction tube 11, and the other end is coaxial with the extension member 17. And a pressing member 18 extending in the direction opposite to the suction pipe 11. A handle portion 18a for facilitating holding the pressing member 18 is formed at the end portion of the pressing member 18.

In this way, the lever member 12 has the suction tube 11 fixed to the fulcrum portion 12a and the housing 4 fixed to the intermediate position thereof, and the handle portion 18a is formed at a position farthest from the fulcrum portion 12a. Therefore, after the suction portion 14 of the suction pipe 11 is sucked, if the holding portion 18a is held and pressed in the direction of the plate 2, the housing 4 can be pressed against the plate 2 with a small force as in the principle of leverage. it can.

Further, the stop valve 13 has its handle 13a facing the direction of the handle portion 18a of the pressing member 18, so that the stop valve 13 can be easily opened and closed even when the pressing member 18 is being held by the handle portion 18a. Has become.

Next, the operation of the embodiment will be described.

In the vacuum test of the welded portion 3, first, the test apparatus 1 is placed on the plate member 2 such that the housing 4 covers the welded portion 3 to be inspected and the welded portion 3 is located in the notch 7. Apply to Then, after closing the stop valve 13, air is sent into the ejector pipe 6 to suck the inside of the suction pipe 5. Then, the inside of the suction pipe 11 is sucked before the inside of the housing 4, and the suction portion 14 is sucked onto the plate material 2. Utilizing this suction force, the handle portion 18a of the lever member 12 is held and pressed in the direction of the plate member 2, and the housing 4 is pressed so that the peripheral edge portion 6 thereof closely contacts the plate member 2. After that, when the stop valve 13 is opened, the inside of the housing 4 is sucked to form a vacuum and the test can be performed.

As described above, since the suction pipe 11 is sucked onto the plate member 2 in advance and the lever member 12 is pressed before the inside of the housing 4 is evacuated, the housing 4 can be pressed and brought into close contact with the plate member 2 with a small force. . Therefore, even if it is used for a vacuum test in the welded portion 3 between the side plates of the tank, the test device 1 can be sufficiently brought into close contact with itself without being separated from the side plate due to the reaction due to pressing, and it can be used also in the side plate of the tank. Further, even a relatively heavy test apparatus 1 can be supported by the suction force of the suction tube 11, and the force for supporting the test apparatus 1 is small, and the test is easy.

Although only one suction pipe 11 is provided in the present embodiment, a plurality of suction pipes 11 can be provided to enhance the suction force. Further, by appropriately setting the positional relationship and the length of the suction tube 11 and the lever member 12, the test apparatus 1 with a smaller pressing force can be obtained.

[0025]

[Effect of device]

 The present invention exhibits the following excellent effects.

(1) Since the test device can be pressed with a small force, the vacuum test can be performed at the welded portion between the side plates of the tank.

(2) The test device can be supported by the suction force of the suction pipe, and the force for supporting the test device is small, and the test is easy.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a weld vacuum testing device according to the present invention.

FIG. 2 is a partial cross-sectional perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test apparatus 3 Welding section 4 Housing 5 Suction tube 11 Adsorption tube 12a Support point section 12 Lever member

Claims (2)

[Scope of utility model registration request] 1. A housing which is detachably attached to a welded portion to be inspected so as to cover the welded portion in an airtight manner, and a gas which is connected to the housing and sucks an atmosphere inside the housing into a vacuum to leak from the welded portion. In a weld vacuum tester having a suction pipe for inspecting the presence or absence, one end is connected to a suction pipe located downstream of the housing in the suction direction, and the other end sucks in the vicinity of the weld. A vacuum test apparatus for a welded part, comprising: a suction tube; and a lever member, the fulcrum of which is supported by the suction tube, for supporting the housing by pressing the housing onto the welded part. 2. A stop valve is provided on the suction pipe on the side of the housing from the connection position of the suction pipe and the suction pipe, the stop valve being closed before sucking the inside of the housing to suck the suction pipe in advance. The weld vacuum tester according to claim 1.