JP6854152B2 - Vacuum chamber forming device for weld leak inspection - Google Patents

Description

The present invention relates to a vacuum chamber forming apparatus for weld leakage inspection, which uses a vacuuming technique to inspect a weld defect in a weld.

Conventionally, a vacuum chamber forming device for welding leakage inspection called a vacuum tester as shown in Non-Patent Document 1 for inspecting a defect of a welded portion is on the market. FIG. 5 is a photograph of a vacuum tester posted on the homepage of Non-Patent Document 1.

In the conventional vacuum chamber forming device for weld leakage inspection, a transparent plate is assembled to a metal frame-shaped frame in order to form a vacuum chamber inside, and packing is attached to the end of the frame located on the opposite side of the transparent plate. Is placed. In order to inspect the welding defect of the welded portion, the packing of the vacuum chamber forming device for the welded portion leakage inspection is brought into contact with the welded portion, and the vacuum chamber is evacuated. In fact, if soapy water is applied to the welded portion surrounded by the packing, bubbles will be generated from the portion where the weld is defective, so that the defective portion of the weld can be found.

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However, in the past, since the metal frame was heavy, when inspecting welds on the side of the hull of a ship or on the ceiling inside the ship, the burden on the operator who supported the heavy object and inspected was heavy, and efficiency was high. Was very bad. Moreover, since the packing material used for packing in the conventional device is a plate-shaped rubber packing, if the welded part is curved, the welded part has a corner part, or the welded part is uneven, packing is performed. There was a risk of vacuum leakage from this part.

An object of the present invention is to provide a vacuum chamber forming apparatus for welding leakage inspection, which is lightweight and does not cause vacuum leakage from a packing portion.

Another object of the present invention is to provide a vacuum chamber forming apparatus for weld leakage inspection, which can perform inspection without any trouble even when the weld is curved.

Another object of the present invention is to provide a vacuum chamber forming apparatus for welding leakage inspection, which can inspect the welded portion without any trouble even if the welded portion has a corner portion.

The present invention includes a packing that surrounds at least a part of the surface of the welded portion, and a packing fixing portion having a structure in which the packing is fixed and at least the space surrounded by the packing is made into a vacuum chamber capable of evacuating. The target is a vacuum chamber forming device for welding leakage inspection. In the present invention, the packing is made of an elastic body and opens toward the hollow annular main body portion, the outer peripheral surface of the annular main body portion that does not face the vacuum chamber, and the inner peripheral surface of the annular main body portion, and the circumference of the annular main body portion. It has a structure with an annular groove that is continuous in the direction.

When a packing having such a shape is used, when the packing starts to be compressed between the packing fixing portion and the welded portion in the process of evacuating the vacuum chamber, the packing is deformed so as to widen the annular groove. When the amount of compression increases, the packing part fixed to the packing fixing part of the packing parts located on both sides of the annular groove does not move, but the packing part not fixed to the packing fixing part forms a welded part. It moves while extending along the surface of the material to be welded. As a result, the contact area between the packing and the surface of the material to be welded increases, and even if the shape of the welded portion is curved or the surface of the welded portion has some irregularities, vacuum leakage does not occur.

The annular groove is preferably formed at a position close to the packing fixing portion. In this way, the final deformation form of the packing is such that the facing portions of the inner peripheral surface of the packing are in close contact with each other, the contact area between the packing and the surface of the material to be welded is maximized, and vacuum leakage is maximized. Stop.

The packing fixing portion preferably has flexibility that conforms to the shape of the surface of the welded portion by bending when the packing is pressed against the surface of the welded portion with a force equal to or higher than a predetermined value. When the packing fixing portion has such flexibility, the shape of the material to be welded on which the welded portion is formed is curved because the packing fixing portion bends according to the shape of the welded portion. Even so, it is possible to prevent the formation of a gap between the packing and the welded portion.

It is preferable that the annular main body of the packing is formed of urethane foam and the cross-sectional shape in the direction orthogonal to the circumferential direction is annular. Then, it is preferable that the annular main body portion is joined to the packing fixing portion by using a silicon-based adhesive. Urethane foam is suitable as a packing material because it has a strong shape-restoring force after deformation and high durability. Further, the silicon-based adhesive has a strong bonding strength in the compression direction, but a low bonding strength in the peeling direction. Therefore, the packing replacement work is easy.

It is preferable that at least the portion of the packing fixing portion facing the vacuum chamber has a flat plate shape made of a transparent or translucent material. If it is a flat packing fixing portion, the weight of the device can be reduced. Further, if there is a transparent or translucent portion, the work can be performed while confirming the position of the welded portion when performing the inspection work, so that the workability is excellent.

In particular, if the packing fixing portion is made of a transparent synthetic resin plate, it is possible to provide the lightest and cheapest vacuum chamber forming apparatus for welding leakage inspection.

The packing fixing portion may be connected via a hinge having an airtight structure, and may be composed of two divided packing fixing portions that rotate around the hinge. With such a structure, even if the welded portion is at the apex of a curved corner, the two split packing fixing portions are brought into contact with the surfaces of the material to be welded located on both sides of the welded portion and welded with the packing. It becomes possible to surround the part.

The airtight hinge is provided with a pair of hose members formed of an elastic material and connected to each other in a parallel lined state, and the connecting portion of the pair of hose members is between the two split packing fixing portions. It is preferable that the pair of hose members have a structure in which the pair of hose members are joined to the facing portions of the two split packing fixing portions in an airtight state by an elastic bonding material in the positioned state. With such a hinge, the structure is simple and the airtightness can be easily maintained.

It is preferable that at least the portion of the two split packing fixing portions facing the vacuum chamber has a flat plate shape made of a transparent or translucent material. Further, it is preferable that the two divided packing fixing portions are each composed of a transparent synthetic resin plate. With such a configuration, it is possible to provide a vacuum chamber forming apparatus for weld leakage inspection provided with two split packing fixing portions at the lightest weight and the lowest cost.

(A) is a perspective view of an example of the embodiment of the vacuum chamber forming apparatus for welding leakage inspection of the present invention, and (B) is a front view of the embodiment. It is a schematic diagram which shows an example of the working mode when the worker who got on the gondola inspects the welding defect of the welding part of the hull of a ship by using the vacuum chamber forming apparatus for welding part leakage inspection of this embodiment. (A) and (B) are diagrams used for explaining the structure and deformation mode of the packing, respectively. (A) is a perspective view showing a part of the packing of the second embodiment of the vacuum chamber forming apparatus for welding leakage inspection of the present invention in cross section, and (B) is B of FIG. 4 (A). -B line cross section, (C) and (D) are cross-sectional views showing aspects when the second embodiment is used, respectively. It is a perspective view which shows the structure of the existing vacuum tester.

Hereinafter, embodiments of the vacuum chamber forming apparatus for welding leakage inspection of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
FIG. 1A is a perspective view of an example of the embodiment of the vacuum chamber forming apparatus 1 for welding leakage inspection of the present invention, and FIG. 1B is a front view of the embodiment. FIG. 2 shows a work in which the worker OP on the gondola G inspects the welding defect of the welded portion W of the hull B of the ship by using the vacuum chamber forming device 1 for welding portion leakage inspection of the present embodiment. It is the schematic which shows an example of an aspect. 3A and 3B are diagrams used to explain the structure and deformation mode of the dictated packing 3.

In these figures, in the vacuum chamber forming apparatus 1 for welding portion leakage inspection of the present embodiment, the packing 3 surrounding at least a part of the surface of the welded portion W (see FIG. 2) and the packing 3 are fixed and at least packing. It is provided with a packing fixing portion 7 made of a transparent or translucent synthetic resin plate (acrylic plate in the present embodiment) having a structure in which the space surrounded by 3 is a vacuum chamber 5 capable of evacuating. The packing 3 is made of an elastic body such as urethane foam. Then, as shown in FIG. 3A, the packing 3 is directed toward the hollow annular main body 31, the outer peripheral surface 33 of the annular main body 31 that does not face the vacuum chamber 5, and the inner peripheral surface 35 of the annular main body 31. An annular groove 4 that is open and continuous in the circumferential direction of the annular main body 31 is provided, and the cross-sectional shape in the direction orthogonal to the circumferential direction is annular. The annular main body 31 is joined to the packing fixing portion 7 by using an adhesive layer 9 made of a silicon-based adhesive. Note that FIGS. 3A and 3B are diagrams for explaining the difference in the deformation mode of the packing 3 between the case where the annular groove 4 is present and the case where the annular groove 4 is not present, and in each of the drawings, the packing 3 on the left side is shown. Is the cross section of the packing 3 used in the present embodiment having the annular groove 4, and the packing 3'on the right side is the cross section of the packing 3'to be compared without the annular groove 4.

As shown in FIG. 3A, the annular groove 4 is formed at a position close to the packing fixing portion 7. When the packing 3 having such a shape is used, as shown in FIG. 3B, the packing 3 begins to be compressed between the packing fixing portion 7 and the welded portion W in the process of evacuating the vacuum chamber 5. Then, the packing 3 is deformed so as to widen the annular groove 4. When the amount of compression increases, the packing portion fixed to the packing fixing portion 7 among the packing portions located on both sides of the annular groove 4 does not move, but the packing portion 37 not fixed to the packing fixing portion 7 is welded. The portion W moves while extending along the surface of the material to be welded (B) on which the portion W is formed. As a result, the contact area between the packing 3 and the surface of the material (B) to be welded increases, and even if the shape of the welded portion W is curved or the surface of the welded portion W has some irregularities, vacuum leakage occurs. It does not occur. On the other hand, the packing 3'without the annular groove 4 is not completely compressed as shown in FIGS. 3 (A) and 3 (B), and the contact area with the surface of the material to be welded. There is a limit to increasing.

When such a packing 3 is used, the final deformation form of the deformation of the packing 3 is such that the facing portions of the inner peripheral surface 35 of the packing 3 are in close contact with each other, and the packing 3 and the surface of the material to be welded (B) are in close contact with each other. The contact area is maximized, and the vacuum leakage is prevented as much as possible.

It is preferable that the packing fixing portion of the present embodiment has flexibility that bends when the packing is pressed against the surface of the welded portion with a force equal to or higher than a predetermined force and follows the shape of the surface of the welded portion. When the packing fixing portion has such flexibility, the shape of the material to be welded on which the welded portion is formed is curved because the packing fixing portion bends according to the shape of the welded portion. Even so, it is possible to prevent the formation of a gap between the packing and the welded portion.

The adhesive used to form the adhesive layer 9 for joining the packing 3 to the packing fixing portion 7 is preferably a silicon-based adhesive. Silicone-based adhesives have high bonding strength in the compression direction, but low bonding strength in the peeling direction, which facilitates replacement of the consumable packing 3.

Since at least the portion of the packing fixing portion 7 used in the present embodiment facing the vacuum chamber has a flat plate shape made of a transparent or translucent synthetic resin material, the weight of the apparatus can be reduced. Further, if there is a transparent or translucent portion, as shown in FIG. 2, the operator OP can perform the work while confirming the position of the welded portion W when performing the inspection work, so that the workability is excellent. ing.

As shown in FIGS. 1 and 2, a connector C to which a hose H for evacuation is attached is fixed to the packing fixing portion 7. The connector C has a function of communicating the vacuum chamber 5 and the hose H. Further, the packing fixing portion 7 is equipped with a vacuum degree measuring meter M for confirming the degree of vacuum of the vacuum chamber 5. Even when the liquid detergent is applied to the part to be welded and the inspection is performed to confirm the existence of the welding defect, the operator OP confirms the degree of welding defect by referring to the measured value of the vacuum degree measuring meter M. be able to.

By the way, in the present embodiment, the packing 3 is formed by using a urethane foam tube having a diameter of 6 cm and a thickness of 19 mm, and the packing fixing portion 7 is transparent having a thickness of 10 mm and a length and width of 110 cm × 25 cm. An acrylic resin plate is used, and a silicon-based adhesive sold by Hamatite under the product name of Super One is used as the adhesive.

(Second Embodiment)
FIG. 4A is a perspective view showing a part of the packing of the second embodiment of the vacuum chamber forming apparatus for welding leakage inspection of the present invention in cross section, and FIG. 4B is FIG. 4 (B). It is a cross-sectional view taken along the line BB of A), and FIGS. 4 (C) and 4 (D) are cross-sectional views showing aspects when the second embodiment is used. In FIGS. 4A to 4D, the same members as those in the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals as those given in FIGS. 1 to 3 in detail. The explanation is omitted. In the vacuum chamber forming apparatus 10 for welding leakage inspection of the second embodiment, unlike the first embodiment, the packing fixing portion 70 is connected via a hinge 80 having an airtight structure, and the hinge 80 is connected. It is composed of two split packing fixing portions 70A and 70B that rotate around the center. The airtight hinge 80 includes a pair of hose members 80A and 80B formed of an elastic material such as rubber and connected to each other in a parallel arrangement, and a connecting portion 81 of the pair of hose members 80A and 80B. Is located between the two split packing fixing portions 70A and 70B, and the pair of hose members 80A and 80B are joined to the facing portions of the two split packing fixing portions 70A and 70B in an airtight state by the elastic bonding material 83. Has a structure. With such a hinge 80, the structure is simple and the airtightness can be easily maintained.

As shown in FIGS. 4C and 4D, in the case of the welded portion leakage inspection vacuum chamber forming apparatus 10 of the present embodiment, even when the welded portion W is at the apex of the curved corner. The two split packing fixing portions 70A and 70B can be brought into contact with the surfaces of the materials to be welded (B) located on both sides of the welded portion W, and the welded portion W can be surrounded by the packing 3. Therefore, in the case of the welded portion leakage inspection vacuum chamber forming apparatus 10 of the present embodiment, various welded portions can be inspected by one welded portion leak inspection vacuum chamber forming apparatus 10, which is extremely versatile. high.

Incidentally, in the present embodiment, the packing 3 is formed by using a urethane foam tube having a tube diameter of 3 cm and a material thickness of 4 mm, and the two split packing fixing portions 70A and 70B have a thickness of 10 mm and a length. A transparent acrylic resin plate with a width of 100 cm x 10 cm is used, and the hose sold by Monotaro is used as the hose members 80A and 80B. Silicon-based adhesive sold by Hamatite under the product name of Super One as an adhesive. The agent is used, and the adhesive sold by 3M under the product name of IG40 is used as the elastic bonding material 83.

(Modification example)
In the above embodiment, the packing fixing portions 7 and 70 are made of a synthetic resin plate, but a handle (grip handle) may be attached to the packing fixing portions 7 and 70, and the peripheral edge of the synthetic resin plate may be attached. A protective frame may be provided on the portion from a lightweight material such as aluminum.

According to the present invention, when the packing starts to be compressed between the packing fixing portion and the welded portion in the process of evacuating the vacuum chamber, the packing is deformed so as to widen the annular groove. When the amount of compression increases, the packing part fixed to the packing fixing part of the packing parts located on both sides of the annular groove does not move, but the packing part not fixed to the packing fixing part forms a welded part. It moves while extending along the surface of the material to be welded. As a result, the contact area between the packing and the surface of the material to be welded increases, and even if the shape of the weld is curved or the surface of the weld has some irregularities, vacuum leakage does not occur. There are advantages.

1 Vacuum chamber forming device for weld leakage inspection 3 Packing 4 Circular groove 5 Vacuum chamber 7 Packing fixing part 9 Adhesive layer 10 Welding part leak inspection vacuum chamber forming device 31 Circular body 33 Outer circumference 35 Inner peripheral surface 37 Packing Packing fixing part 70A, 70B Divided packing fixing part 80 Hose 80A, 80B Hose member 81 Connecting part 83 Elastic bonding material B Hull W Welding part G Gondola OP Worker H Hose C Connector M Vacuum degree measurement meter

Claims (8)

With packing that surrounds at least part of the surface of the weld,
A welded portion leak inspection vacuum chamber forming apparatus comprising a packing fixing portion having a structure in which the packing is fixed and at least the space surrounded by the packing is a vacuum chamber capable of vacuuming.
The packing is made of an elastic body and opens toward a hollow annular main body portion, an outer peripheral surface of the annular main body portion that does not face the vacuum chamber, and an inner peripheral surface of the annular main body portion, and the circumference of the annular main body portion. It has a structure with an annular groove that is continuous in the direction .
The packing fixing portion is bent when the packing is pressed against the surface of the welded portion with a force equal to or higher than a predetermined force, and has flexibility to follow the shape of the surface of the welded portion. Vacuum chamber forming device for partial leak inspection. The vacuum chamber forming apparatus for welding leakage inspection according to claim 1, wherein the annular groove is formed at a position close to the packing fixing portion. The annular main body is formed of urethane foam, and the cross-sectional shape in the direction orthogonal to the circumferential direction is annular.
The vacuum chamber forming apparatus for welding leakage inspection according to claim 1 or 2 , wherein the annular main body portion is joined to the packing fixing portion by using a silicon-based adhesive. The vacuum chamber for welding leakage inspection according to claim 1 or 2 , wherein at least a portion of the packing fixing portion facing the vacuum chamber has a flat plate shape made of a transparent or translucent material. Forming device. The vacuum chamber forming apparatus for welding leakage inspection according to claim 4 , wherein the packing fixing portion is made of a transparent synthetic resin plate. With packing that surrounds at least part of the surface of the weld,
A welded portion leak inspection vacuum chamber forming apparatus comprising a packing fixing portion having a structure in which the packing is fixed and at least the space surrounded by the packing is a vacuum chamber capable of vacuuming.
The packing is made of an elastic body and opens toward a hollow annular main body portion, an outer peripheral surface of the annular main body portion that does not face the vacuum chamber, and an inner peripheral surface of the annular main body portion, and the circumference of the annular main body portion. It has a structure with an annular groove that is continuous in the direction.
The packing fixing portion is connected via a hinge having an airtight structure, and is composed of two split packing fixing portions that rotate around the hinge.
The hinge of the airtight structure
It has a pair of hose members formed of elastic material and connected to each other in parallel.
In a state where the connecting portion of the pair of hose members is located between the two split packing fixing portions, the pair of hose members are joined to the facing portions of the two split packing fixing portions in an airtight state by an elastic bonding material. A vacuum chamber forming device for welding leak inspection having a structure that has been constructed. The vacuum for weld leakage inspection according to claim 6, wherein at least a portion of the two split packing fixing portions facing the vacuum chamber has a flat plate shape made of a transparent or translucent material. Room forming device. The vacuum chamber forming apparatus for welding leakage inspection according to claim 6 , wherein the two divided packing fixing portions are each composed of a transparent synthetic resin plate.

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