Vacuum box, leakage detection device and method

Abstract

A vacuum box is used to perform leakage detection on the weld of a component to be detected. The component to be detected has a first surface and a second surface, and there is an angle between the first surface and the second surface. The weld to be detected is located at the connection between the first surface and the second surface. The vacuum box includes a first contact surface, a second contact surface and a sealing member. The first contact surface is used to fit with the first surface; the second contact surface is used to fit with the second surface; the sealing member is arranged on the vacuum box and at the connection between the vacuum box and the component to be detected; wherein the angle between the first contact surface and the second contact surface is adjustable so that the first contact surface fits with the first surface and the second contact surface fits with the second surface. In the fitted state, the vacuum box and the first and second surfaces jointly define a sealed space, and the weld is located in the sealed space. A leakage detection device and method are also provided.

Description

Technical Field

[0001] The invention relates to the field of industrial vacuum detection devices, and in particular to a vacuum box, a leakage detection device and a method. Background Art

[0002] Conventional vacuum box detection of butt joints and corner joints uses a fixed-shape vacuum box directly covering the weld, and uses equipment to reduce the pressure inside the vacuum box. However, for vacuum box detection of local leakage of butt joints and corner joints at different angles, it is necessary to use vacuum boxes of various specifications. The disadvantage is that it greatly increases the detection cost and detection portability, reduces work efficiency, and causes waste of resources. Summary of the invention

[0003] An object of the present invention is to provide a vacuum box which can improve the detection efficiency of weld leakage detection and reduce the detection cost.

[0004] The above-mentioned vacuum box is used to perform leakage detection on the weld of the component to be detected. The component to be detected has a first surface and a second surface, and there is an angle between the first surface and the second surface. The weld to be detected is located at the connection between the first surface and the second surface. It is characterized in that the vacuum box includes: a first contact surface for fitting with the first surface; a second contact surface for fitting with the second surface; and a sealing member, which is arranged on the vacuum box at the connection between the vacuum box and the component to be detected; wherein the angle between the first contact surface and the second contact surface is adjustable so that the first contact surface fits with the first surface and the second contact surface fits with the second surface. In the fitted state, the vacuum box and the first surface and the second surface jointly define a sealed space, and the weld is located in the sealed space.

[0005] In one or more embodiments, the vacuum box includes: a first shell having the first contact surface; a second shell having the second contact surface; and a connecting member hingedly connecting the first shell and the second shell.

[0006] In one or more embodiments, the first shell includes two first side walls and a first arc-shaped member, the first side wall is fan-shaped, and the two ends of the first arc-shaped member are respectively connected to the arc-shaped edges of the two first side walls; the second shell includes two second side walls and a second arc-shaped member, the second side wall is fan-shaped, and the two ends of the second arc-shaped member are respectively connected to the arc-shaped edges of the two second side walls; wherein the first side wall and the second side wall are hinged at the top angle of the fan by a plurality of the connecting members.

[0007] In one or more embodiments, the inner wall surface of the first arc-shaped member fits with the outer wall surface of the second arc-shaped member and can slide relative to each other.

[0008] In one or more embodiments, the first shell further includes a first crossbeam, which is disposed on the side of the first arc-shaped member, and whose two ends respectively abut against the two first side walls; the second shell further includes a second crossbeam, which is disposed on the side of the second arc-shaped member, and whose two ends respectively abut against the two second side walls.

[0009] In one or more embodiments, the connecting member is a connecting shaft, the connecting shaft has a first section and a second section, the first shell and the second shell are respectively provided with through holes, the second section has a first matching portion, the through hole is provided with a second matching portion, and the connecting shaft has a first position and a second position in the through hole; in the first position, the first section is passed through the through hole to enable the first shell and the second shell to be hinged; in the second position, the first matching portion and the second matching portion cooperate to limit the relative rotation between the first shell and the second shell.

[0010] In one or more embodiments, the first matching portion is a protrusion protruding from the outer circumference of the connecting shaft, and the second matching portion is a plurality of grooves, and the protrusion is movable in the groove along the axial direction of the connecting shaft to enable the connecting shaft to switch between the first position and the second position.

[0011] The angle between the first contact surface and the second contact surface of the vacuum box can be freely adjusted, and the vacuum box and the joint between the vacuum box and the component to be tested are sealed by a seal to achieve leakage detection of welds on welded parts at different angles. The vacuum box is easy to carry, has high working efficiency, and can reduce detection costs.

[0012] Another object of the present invention is to provide a leakage detection device that can improve the detection efficiency of weld leakage detection and reduce the detection cost.

[0013] The leakage detection device comprises a vacuum pump and the vacuum box, wherein the vacuum pump is used to extract gas from the vacuum box.

[0014] In one or more embodiments, a vacuum gauge and a regulating valve are further included, wherein the vacuum gauge is used to detect the vacuum pressure in the vacuum box, and the regulating valve is used to adjust the evacuation rate of the vacuum pump.

[0015] The angle between the first contact surface and the second contact surface of the above-mentioned leakage detection device can be freely adjusted, and the vacuum box and the connection between the vacuum box and the component to be detected are sealed by a seal to achieve leakage detection of welds on welded parts at different angles. The leakage measurement device is easy to carry, has high working efficiency, and can reduce detection costs.

[0016] Another object of the present invention is to provide a leakage detection method, which can improve the detection efficiency of weld leakage detection and reduce the detection cost.

[0017] The above-mentioned leakage detection method adopts the above-mentioned leakage detection device to perform leakage detection on the weld on the component to be detected, and the leakage detection method includes the following steps: assembling the leakage detection device so that the angle between the first contact surface and the second contact surface is adjustable; placing the vacuum box at the weld to be detected so that the first contact surface fits with the first surface; adjusting the angle between the first contact surface and the second contact surface so that the second contact surface fits with the second surface to form the sealed space, and the weld is located in the sealed space; fixing the relative angular position of the first contact surface and the second contact surface; sealing the vacuum box and the joint between the vacuum box and the component to be detected by the sealing member; starting the vacuum pump to vacuum the sealed space and detect the leakage of the weld.

[0018] The angle between the first contact surface and the second contact surface of the leakage detection device used in the above leakage detection method can be freely adjusted, and the vacuum box and the connection between the vacuum box and the component to be detected are sealed by a seal to achieve leakage detection of welds on welded parts at different angles. The leakage detection method has high detection efficiency and can reduce detection costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0020] Figure 1 It is a schematic structural diagram of a vacuum box according to an embodiment.

[0021] Figure 2 is an exploded view of a vacuum box according to one embodiment.

[0022] Figure 3 It is a front view of the first shell and the connecting member according to one embodiment.

[0023] Figure 4 1 is a top view of a first shell and a connecting member according to an embodiment.

[0024] Figure 51 is a side view of a first shell and a connecting member according to an embodiment.

[0025] Figure 6 is a front view of a second housing and a sealing member according to an embodiment.

[0026] Figure 7 FIG. 1 is a top view of a second shell and a sealing member according to an embodiment.

[0027] Figure 8 is a side view of a second housing and a sealing member according to an embodiment.

[0028] Fig. 9 is a schematic diagram of a connecting member according to an embodiment.

[0029] Fig.10 yes Fig. 9 Cross-sectional view of the connecting part along the AA direction.

[0030] Fig.11 is a schematic diagram of a first through hole according to an embodiment.

[0031] Symbols and Markings

[0032] 1 First shell

[0033] 2 Second shell

[0034] 3 Connectors

[0035] 4 Seals

[0036] 5 First beam

[0037] 6 Second beam

[0038] 7 Fixing bolts

[0039] 8 Connection holes

[0040] 9 Limit block

[0041] 10 Second matching part

[0042] 11 First side wall

[0043] 12 First arc

[0044] 21 Second side wall

[0045] 22 Second arc-shaped member

[0046] 31. Paragraph 1

[0047] 32 Second paragraph

[0048] 33 Limiting part

[0049] 111 First side

[0050] 112 First curved surface

[0051] 113 First through hole

[0052] 114 Bottom edge of first side wall

[0053] 121 The third side

[0054] 122 first arc-shaped member side

[0055] 211 Second side

[0056] 212 Second curved surface

[0057] 213 Second through hole

[0058] 221 The fourth side

[0059] 222 second arc-shaped member side

[0060] 321 First Coordination Section DETAILED DESCRIPTION

[0061] The present invention is further described below in conjunction with specific embodiments and drawings. More details are described in the following description to facilitate a full understanding of the present invention, but the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment. It should be noted that these and other subsequent drawings are only examples, which are not drawn according to the conditions of equal proportions, and should not be used as a limitation on the protection scope of the actual requirements of the present invention.

[0062] When performing weld leak detection on welded parts such as corner joints, there is an angle between the two surfaces of the component to be tested that are connected to the weld. Since the angles of the angles on different components to be tested are different, a variety of vacuum boxes of different specifications are usually required in the existing vacuum testing process, which reduces the detection efficiency and increases the detection cost.

[0063] According to some embodiments of the present application, a vacuum box is provided for leak detection of a weld of a component to be detected. The component to be detected has a first surface and a second surface. There is an angle between the first surface and the second surface. The weld to be detected is located at the connection between the first surface and the second surface.

[0064] The vacuum box includes a first contact surface for contacting with the first surface of the component to be detected, and a second contact surface for contacting with the second surface of the component to be detected. The vacuum box also includes a seal 4, which is arranged in the vacuum box and at the junction of the vacuum box and the component to be detected.

[0065] The angle between the first contact surface and the second contact surface is adjustable so that the first contact surface is attached to the first surface and the second contact surface is attached to the second surface. In the attached state, the vacuum box and the first and second surfaces jointly define a sealed space, and the weld is located in the sealed space.

[0066] When leak testing is performed on a weld, the vacuum box is placed on the component to be tested so that the weld is located in the sealed space. The vacuum box can be connected to an external gas extraction device to extract the air in the vacuum box to achieve leak testing of the weld.

[0067] Further, according to some embodiments of the present application, see Figure 1 The vacuum box includes a first shell 1, a second shell 2 and a connecting member 3. The first shell 1 has a first contact surface, the second shell 2 has a second contact surface, and the connecting member 3 hinges the first shell 1 and the second shell 2 to allow the first shell 1 to rotate relative to the second shell 2, thereby achieving an adjustable angle between the first contact surface and the second contact surface.

[0068] It is understandable that in Figure 1 In the embodiment shown, the vacuum box only includes two shells that can rotate relative to each other: a first shell 1 and a second shell 2, forming a vacuum box with an inner and outer two-layer shell structure. The following embodiment will illustrate the vacuum box with a two-layer shell structure. However, in other suitable embodiments, the vacuum box may also include one or more intermediate shells, which are arranged between the first shell 1 and the second shell 2 and are respectively hinged to the first shell 1 and the second shell 2, thereby forming a vacuum box with a multi-layer shell structure to improve the application range of the vacuum box.

[0069] exist Figure 1 In the illustrated embodiment, the first shell 1 includes two first side walls 11 and a first arc-shaped member 12, the first side wall 11 is fan-shaped, and the two ends of the first arc-shaped member 12 are respectively connected to the arc-shaped edges of the two first side walls 11, wherein the first side wall 11 has a first side surface 111 and a first arc surface 112, and the first arc-shaped member 12 has a third side surface 121. In the first shell 1, a first contact surface that fits the first surface of the component to be detected is formed by the two first side surfaces 111 and the third side surface 121.

[0070] The second shell 2 includes two second side walls 21 and a second arc-shaped member 22, the second side wall 21 is fan-shaped, and the two ends of the second arc-shaped member 22 are respectively connected to the arc-shaped edges of the two second side walls 21, wherein the second side wall 21 has a second side surface 211 and a second arc surface 212, and the second arc-shaped member 22 has a fourth side surface 221. In the second shell 2, the two second side surfaces 211 and the fourth side surface 221 form a second contact surface that fits the second surface of the component to be detected.

[0071] Taking the first shell 1 as an example, the first contact surface fits with the first surface, which means that when the first shell 1 is placed on the first surface, the first contact surface is in physical contact with the first surface, with only a small gap between the first surface and the first surface, which can be sealed by setting a seal 4.

[0072] like Figure 1 As shown, a first through hole 113 is provided at a top corner of the first side wall 11, and a second through hole 213 is provided at a top corner of the second side wall 21. The connecting member 3 can be arranged in the first through hole 113 and the second through hole 213. The first side wall 11 and the second side wall 21 at both ends of the vacuum box are respectively hinged at the top angle position of the fan shape through the two connecting members 3, which serve as the rotation axis of the vacuum box, so that the first shell 1 can rotate concentrically relative to the second shell 2, so as to facilitate determining the angle variation range between the first contact surface and the second contact surface.

[0073] In one embodiment, the inner wall surface of the first arc-shaped member 12 fits with the outer wall surface of the second arc-shaped member 22 and can slide relative to each other, so that the gap formed between the side edge 122 of the first arc-shaped member and the upper surface of the second arc-shaped member 22 can be sealed by setting a seal 4.

[0074] In one embodiment, the vacuum box further includes a first beam 5 and a second beam 6. Figure 2 As shown, the first crossbeam 5 is arranged on the side 122 of the first arc-shaped member, and its two ends are respectively abutted against the two first side walls 11 and perpendicular to the first side walls 11, and a frame structure is formed by the two first side walls 11 and the two first crossbeams 5, and the first arc-shaped member 12 is arranged above the frame structure to form a first shell 1; the second crossbeam 6 is arranged on the side 222 of the second arc-shaped member, and its two ends are respectively abutted against the two second side walls 21 and perpendicular to the second side walls 21, and a frame structure is formed by the two second side walls 21 and the two second crossbeams 6, and the second arc-shaped member 22 is arranged above the frame structure to form a second shell 2.

[0075] Figures 3 to 5It is a schematic diagram of the structure of the first shell 1 and the connecting member 3 in the assembled state in one embodiment, showing the connection method of each component in the first shell 1. Multiple threaded holes corresponding to the positions are arranged on the two ends of the first arc-shaped member 12 and the first arc surface 112 of the first side wall 11, and the multiple threaded holes are distributed along the direction of the arc extension. The fixing bolt 7 can pass through the first arc-shaped member 12 and connect with the first side wall 11 to fix the first arc-shaped member 12 to the first side wall 11; multiple threaded holes corresponding to the positions are arranged on the side edge 122 of the first arc-shaped member and the first crossbeam 5, and the multiple threaded holes are distributed along the length direction of the first arc-shaped member 12. The fixing bolt 7 can pass through the first arc-shaped member 12 and connect with the first crossbeam 5 to fix the first arc-shaped member 12 to the first crossbeam 5.

[0076] Figures 6 to 8 It is a structural schematic diagram of the second shell 2 and the sealing member 4 in an assembled state in one embodiment, showing the connection method of the individual components in the second shell 2. Multiple threaded holes corresponding to the positions are arranged at both ends of the second arc-shaped member 22 and on the second arc surface 212 of the second side wall 21. The multiple threaded holes are distributed along the direction in which the arc extends. The fixing bolts 7 can pass through the second arc-shaped member 22 and connect with the second side wall 21 to fix the second arc-shaped member 22 to the second side wall 21; multiple threaded holes corresponding to the positions are arranged on the side edge 222 of the second arc-shaped member and the second cross beam 6. The multiple threaded holes are distributed along the length direction of the second arc-shaped member 22. The fixing bolts 7 can pass through the second arc-shaped member 22 and connect with the second cross beam 6 to fix the second arc-shaped member 22 to the second cross beam 6.

[0077] In one embodiment, the fixing bolt 7 is a stainless steel countersunk bolt, and the head of the fixing bolt 7 is sealed by glue to ensure the air tightness of the bolt connection.

[0078] Continue to refer Figure 1 In this embodiment, a plurality of connection holes 8 are provided on the two first side walls 11 of the first housing 1 for connecting with other external devices, such as a gas extraction device or a regulating valve, etc., and a limit block 9 is also provided on one of the first side walls 11. Figure 5 The connection line between the limit block 9 and the first through hole 113 is as follows: Figure 5 As shown by the dotted line, multiple connecting holes 8 are arranged on the side of the connecting line close to the bottom edge 114 of the first side wall, and the limit block 9 is used to limit the relative rotation angle of the first shell 1 and the second shell 2 to avoid collision with the pipeline or device connected to the connecting hole 8 during rotation and affecting the detection.

[0079] like Fig. 9As shown, in one embodiment, the connecting member 3 is a connecting shaft, which has a first section 31 and a second section 32, and the first shell 1 and the second shell 2 respectively have through holes, namely, a first through hole 113 and a second through hole 213. The length of the first section 31 needs to be greater than the sum of the thicknesses of the first side wall 11 and the second side wall 21, so that it can be set in the first through hole 113 and the second through hole 213, and the first shell 1 is rotatably connected to the second shell 2. A limiting portion 33 is also provided at the end of the first section 31 to limit the connecting member 3 in the axial direction.

[0080] The second section 32 is provided with a first matching portion 321 , and the first shell 1 and the second shell 2 are provided with a second matching portion 10 . The first matching portion 321 matches the second matching portion 10 to limit the rotation of the first shell 1 relative to the second shell 2 .

[0081] The connecting shaft (connecting member 3) has a first position and a second position in the first through hole 113 and the second through hole 213. In the first position, the first section 31 is arranged in the first through hole 113 and the second through hole 213 so that the first shell 1 and the second shell 2 are hinged. By moving the connecting shaft (connecting member 3) along the axial direction of the connecting shaft (connecting member 3), it can be moved from the first position to the second position. In the second position, the first matching portion 321 cooperates with the second matching portion 10 to limit the rotation of the first shell 1 relative to the second shell 2. Similarly, by moving the connecting shaft (connecting member 3) along the axial direction of the connecting shaft (connecting member 3), it can be moved from the second position back to the first position, so that the first shell 1 can rotate relative to the second shell 2 again.

[0082] Further, in some embodiments of the present application, the second section 32 cooperates with the first shell 1 and the second shell 2 in the following manner: Figures 9 to 11 As shown, the first matching portion 321 is a protrusion disposed on the outer peripheral surface of the second section 32, the protrusion protrudes outward in the radial direction of the connecting member 3 and extends in the axial direction, the second matching portion 10 is a groove disposed on the first through hole 113 and the second through hole 213, the groove extends in the axial direction of the connecting member 3, so that the protrusion can slide in the groove, thereby realizing that the connecting shaft (connecting member 3) can be switched between the first position and the second position, and a plurality of grooves are arranged along the circumference of the first through hole 113 and the second through hole 213, which can realize the fixing of the shell at different angles. In one embodiment, the height of the protrusion protruding in the radial direction is twice the thickness of the shell. In other embodiments different from those shown in the figure, the first matching portion can also be a groove, and correspondingly, the second matching portion is a protrusion.

[0083] During the installation of the vacuum box, the vacuum box is placed on the first surface of the component to be detected, and the first contact surface is attached to the first surface; the connecting member 3 is moved axially so that the first section 31 is located in the first through hole 113 and the second through hole 213, and the first shell 1 and the second shell 2 can rotate relative to each other; the second shell 2 is rotated, and when the second shell 2 is in a certain angular position, the second contact surface is attached to the second surface of the component to be detected; the connecting member 3 is moved axially so that the protrusion 321 on the second section 32 cooperates with the grooves on the first through hole 113 and the second through hole 213, and the second shell 2 is fixed at the angular position and cannot be rotated further.

[0084] In other embodiments, the connecting member 3 may only include the first section 31, which is used to achieve a rotatable connection between the first shell 1 and the second shell 2. When the relative angular position of the first shell 1 and the second shell 2 needs to be fixed, other fasteners are provided to limit the rotation of the first shell 1 relative to the second shell 2.

[0085] In one embodiment, the sealing member 4 is a sealing strip made of silicone. After the first contact surface and the second contact surface are respectively attached to the two surfaces of the component to be detected, at the gap of the vacuum box, for example Figure 1 A sealing strip is placed in the gap formed between the side edge 122 of the first arc-shaped member and the upper surface of the second arc-shaped member 22, and at the junction of the vacuum box and the component to be detected, and the sealing strip is pasted to the outside of the shell. Inorganic glue can be used to paste the sealing strip, so as to achieve sealing of the vacuum box.

[0086] In another embodiment, the sealing strip need not be pasted on the outside of the vacuum box shell, and it can be placed only at the gap that needs to be sealed. During the leakage detection process, the gas extraction device will extract the gas in the vacuum box, so that the internal pressure of the vacuum box is small and the external pressure is large. The sealing strip placed on the shell will naturally press inward to block the gap due to the pressure difference between the inside and the outside, thereby achieving the same sealing effect on the vacuum box.

[0087] In one embodiment, the first arc-shaped member 12 and the second arc-shaped member 22 are made of organic glass, which facilitates observation of the weld during the inspection process.

[0088] exist Figure 1In the embodiment shown, the cross-sections of the first side wall 11 and the second side wall 21 are both right-angled sectors, so that the angle between the first contact surface and the second contact surface can be adjusted between 90° and 180°. The minimum angle between the first surface and the second surface of the component to be tested that the vacuum box can be used to measure is 90°, and the maximum angle is 180°. It is impossible to test welded parts with an angle less than 90° or greater than 180°. In other embodiments, the sector vertex angles of the first side wall 11 and the second side wall 21 can be other angles, or a vacuum box with a multi-layer shell structure is formed by providing one or more intermediate shells, so that the angle between the first contact surface and the second contact surface has a larger adjustment range, thereby improving the application range of the vacuum box.

[0089] In the above vacuum box and leakage detection device, the first shell 1 and the second shell 2 form a vacuum box with a multi-layer shell structure, and the multiple shells are rotatably connected through the connecting member 3. The connecting member 3 is used as the rotation axis of the shell so that the angle between the first contact surface and the second contact surface can be freely adjusted, and the vacuum box and the connection between the vacuum box and the part to be detected are sealed by the sealing member, so as to realize the leakage detection of welds on welded parts with different angles, which is particularly suitable for detecting butt joints and corner joints with different angles. The vacuum box and leakage detection device are easy to carry, have high working efficiency, and can reduce the detection cost.

[0090] A leakage detection device and detection method are also provided, including the above-mentioned vacuum box and a vacuum pump, the vacuum pump is connected to the first shell 1 through the connection hole 8, and is used to extract the gas in the vacuum box. In one embodiment, the leakage detection device also includes a vacuum gauge and a regulating valve, which are connected to the first shell 1 through multiple connection holes 8. The vacuum gauge is used to detect the vacuum pressure in the vacuum box, and the vacuum pump can be adjusted through the regulating valve according to the measured pressure value.

[0091] The leak detection method includes the following steps:

[0092] Assemble the leakage detection device so that the first housing 1 can rotate relative to the second housing 2, and the angle between the first contact surface and the second contact surface can be adjusted;

[0093] Placing the vacuum box at the weld to be tested so that the first contact surface is in contact with the first surface;

[0094] Rotate the second housing 2, adjust the angle between the first contact surface and the second contact surface, make the second contact surface fit the second surface, and form a sealed space, in which the weld to be tested is located;

[0095] Fixing the relative angular position of the first shell 1 and the second shell 2 (i.e. the first contact surface and the second contact surface);

[0096] The vacuum box and the joint between the vacuum box and the component to be tested are sealed by the sealing member 4;

[0097] Install the regulating valve, vacuum gauge and vacuum pump to the corresponding connecting holes 8;

[0098] Start the vacuum pump to extract the vacuum from the sealed space and perform a leak test on the weld.

[0099] During the inspection, observe the vacuum gauge. If any local sealing is insufficient, use vacuum mud to block the local position to ensure the airtightness of the vacuum box.

[0100] The angle between the first contact surface and the second contact surface of the leakage detection device used in the above leakage detection method can be freely adjusted, and the vacuum box and the connection between the vacuum box and the component to be detected are sealed by a seal to achieve leakage detection of welds on welded parts at different angles. The leakage detection method has high detection efficiency and can reduce detection costs.

[0101] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A vacuum box for leak detection of a weld of a component to be detected, wherein the component to be detected has a first surface and a second surface, an angle is formed between the first surface and the second surface, and the weld to be detected is located at the connection between the first surface and the second surface, characterized in that: The vacuum box comprises: A first contact surface, used to fit with the first surface; A second contact surface, configured to fit the second surface; and A sealing member, arranged on the vacuum box and at the junction of the vacuum box and the component to be detected; The angle between the first contact surface and the second contact surface is adjustable so that the first contact surface is attached to the first surface and the second contact surface is attached to the second surface. In the attached state, the vacuum box, the first surface and the second surface jointly define a sealed space, and the weld is located in the sealed space. The vacuum box also includes: A first shell, comprising two first side walls and a first arc-shaped member, wherein the first side walls are fan-shaped, two ends of the first arc-shaped member are respectively connected to the arc-shaped edges of the two first side walls, the first side wall has a first side surface and a first arc surface, the first arc-shaped member has a third side surface, and the first contact surface is formed by the two first side surfaces and the third side surface; A second shell, comprising two second side walls and a second arc-shaped member, wherein the second side walls are fan-shaped, two ends of the second arc-shaped member are respectively connected to the arc-shaped edges of the two second side walls, the second side walls have a second side surface and a second arc surface, the second arc-shaped member has a fourth side surface, and the two second side surfaces and the fourth side surface form the second contact surface; and a connecting member, hingedly connecting the first shell and the second shell; Wherein, the first side wall and the second side wall are hinged at the top angle of the fan shape through the connecting member; The inner wall surface of the first arc-shaped member and the outer wall surface of the second arc-shaped member are in contact with each other and can slide relative to each other; The first housing further comprises a first crossbeam, which is arranged on the side of the first arc-shaped member, and has two ends respectively abutting against the two first side walls; The second housing further comprises a second crossbeam, which is arranged on the side of the second arc-shaped member, and has two ends respectively abutting against the two second side walls; The connecting member is a connecting shaft, the connecting shaft has a first section and a second section, the first shell and the second shell are respectively provided with through holes, the second section has a first matching portion, the through hole is provided with a second matching portion, and the connecting shaft has a first position and a second position in the through hole; In the first position, the first section is inserted into the through hole so that the first shell is hinged to the second shell; In the second position, the first matching portion matches with the second matching portion to limit relative rotation between the first shell and the second shell.

2. The vacuum box according to claim 1, characterized in that The first matching portion is a protrusion protruding from the outer circumference of the connecting shaft, and the second matching portion is a plurality of grooves. The protrusion is movable in the groove along the axial direction of the connecting shaft to enable the connecting shaft to switch between the first position and the second position.

3. A leakage detection device, characterized in that: The invention comprises a vacuum pump and the vacuum box according to any one of claims 1 to 2, wherein the vacuum pump is used to extract gas in the vacuum box.

4. The leakage detection device according to claim 3, characterized in that: It also includes a vacuum gauge and a regulating valve, wherein the vacuum gauge is used to detect the vacuum pressure in the vacuum box, and the regulating valve is used to adjust the suction rate of the vacuum pump.

5. A leakage detection method, characterized in that: The leak detection device according to claim 3 or 4 is used to perform leak detection on the weld on the component to be detected, and the leak detection method comprises the following steps: Assembling the leakage detection device so that the angle between the first contact surface and the second contact surface is adjustable; Placing the vacuum box at the weld to be tested so that the first contact surface fits the first surface; Adjusting the angle between the first contact surface and the second contact surface so that the second contact surface fits the second surface to form the sealed space, wherein the weld is located in the sealed space; fixing the relative angular position of the first contact surface and the second contact surface; The vacuum box and the joint between the vacuum box and the component to be inspected are sealed by the sealing member; The vacuum pump is started to extract vacuum from the sealed space, and leakage of the weld is detected.

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