Weld detection vacuum hood

Abstract

The utility model discloses a kind of weld detection vacuum covers, including cover, sealing element, vacuum generator, operating handle and vacuum gauge;The cavity with opening direction is in the cover, the cover has viewing window for observing cavity inside;The sealing element is set to the bottom of cover and is surrounded in the opening peripheral of cavity;The vacuum generator is set to cover and is communicated between cavity and outside;The operating handle is set to cover;The vacuum gauge is set to cover, and the vacuum gauge is located outside cover and is communicated with cavity.By being provided with sealing element and vacuum generator on cover, and being cooperatively set viewing window, so that the product can be carried out vacuum sealing to contain weld, to provide a controllable, convenient to observe or introduce detection medium environment for weld (especially high sealing requirement pressure-bearing type equipment weld), to realize the effective evaluation to weld quality, bring convenience for detection operation.

Description

Technical Field

[0001] This utility model relates to the field of vacuum hood technology, and in particular to a vacuum hood for weld inspection. Background Technology

[0002] Weld inspection is a core step in ensuring the safety and reliability of welded structures. Based on whether the inspection damages the workpiece, it can be divided into two main categories: non-destructive testing (NDT) and destructive testing. NDT, because it does not damage the workpiece and can be used for batch testing, is the mainstream application method in industry; destructive testing is used to verify key performance or for sampling inspection. NDT refers to methods for detecting internal or surface defects without damaging the weld or workpiece structure, and is primarily used in scenarios such as in-service equipment inspection and batch product quality screening.

[0003] Currently, nondestructive testing generally relies on direct visual observation of the weld surface's forming quality and defects using the naked eye (or a magnifying glass or endoscope). This method cannot effectively assess weld quality. Therefore, it is necessary to research a solution to address these issues. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies of the existing technology and its main objective is to provide a weld inspection vacuum hood that can effectively solve the problem that existing weld inspection methods cannot effectively assess weld quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A vacuum hood for weld inspection includes a hood body, a sealing element, a vacuum generator, an operating handle, and a vacuum gauge. The hood body has an opening-oriented cavity, and the hood body has an observation window for observing the interior of the cavity. The sealing element is disposed at the bottom of the hood body and surrounds the periphery of the opening of the cavity. The vacuum generator is disposed on the hood body and communicates between the cavity and the outside. The operating handle is disposed on the hood body. The vacuum gauge is disposed on the hood body, located outside the hood body, and communicates with the cavity.

[0006] Preferably, the cover is made of a lightweight, high-strength material with a certain degree of rigidity.

[0007] Preferably, the cover is made of acrylic, aluminum alloy, engineering plastic or stainless steel sheet.

[0008] Preferably, the seal is made of nitrile rubber or silicone rubber.

[0009] Preferably, the top of the cover has a first mounting hole that connects the outside and the cavity. The vacuum generator is located at the top of the cover and has an exhaust pipe that is inserted into the first mounting hole and extends into the cavity.

[0010] Preferably, the vacuum generator has a control valve.

[0011] Preferably, the observation window is a transparent panel located at the top of the cover.

[0012] Preferably, the transparent panel is high-strength tempered glass, acrylic sheet, or polycarbonate sheet.

[0013] Preferably, the outer or inner surface of the cover is provided with reinforcing ribs or a metal frame.

[0014] Preferably, the top of the cover is provided with a second mounting hole, which connects the outside world and the cavity. The vacuum gauge has a connecting tube, which is inserted into the second mounting hole and extends into the cavity.

[0015] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution: By incorporating a seal and a vacuum generator on the enclosure, along with an observation window, this product can vacuum seal weld seams, providing a controllable environment for observation or the introduction of testing media for weld seams (especially those in pressure-bearing equipment with high sealing requirements). This enables effective assessment of weld seam quality and facilitates testing operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0017] Explanation of reference numerals in the attached diagram: 10. Cover body; 11. Observation window 101. Cavity; 102. First mounting hole 103, Second mounting hole 20, Seal 30. Vacuum generator; 31. Evacuation pipe 32. Control valve 40. Operating handle 50. Vacuum gauge 51. Connecting pipe 60. Reinforcing ribs Detailed Implementation Please refer to Figure 1 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a cover 10, a sealing element 20, a vacuum generator 30, an operating handle 40, and a vacuum gauge 50.

[0018] The enclosure 10 has an opening-oriented cavity 101, and an observation window 11 for observing the interior of the cavity 101. In this embodiment, the enclosure 10 is made of a lightweight, high-strength, and relatively rigid material. Specifically, the enclosure 10 is made of acrylic, aluminum alloy, engineering plastic, or stainless steel sheet. The shape of the enclosure 10 needs to be customized according to the contour of the weld to be inspected (such as straight, annular, arc, angular, etc.) to ensure that it can closely fit the weld and its surrounding area, forming a relatively enclosed space. The size of the enclosure 10 should be able to completely cover the weld and heat-affected zone, and leave sufficient space for operation and observation. Furthermore, the top of the enclosure 10 has a first mounting hole 102, which connects the outside to the cavity 101, and a second mounting hole 103, which also connects the outside to the cavity 101. In addition, the observation window 11 has good light transmittance and sufficient strength to withstand the pressure difference between the inside and outside. Specifically, the observation window 11 is a transparent panel located at the top of the cover 10, and the transparent panel is made of high-strength tempered glass, acrylic sheet or polycarbonate sheet, without limitation.

[0019] The seal 20 is disposed at the bottom of the cover 10 and surrounds the periphery of the opening of the cavity 101. The seal 20 is a sealing material with good elasticity, aging resistance, and strong sealing performance. Specifically, the seal 20 is made of nitrile rubber or silicone rubber. The cross-sectional shape of the seal 20 is circular, square, or lip-shaped, and is not limited thereto.

[0020] The vacuum generator 30 is mounted on the housing 10 and connects the cavity 10 to the outside. In this embodiment, the vacuum generator 30 is located at the top outer edge of the housing 10. The vacuum generator 30 has a suction pipe 31, which is inserted into the first mounting hole 102 and extends into the cavity 101. Furthermore, the vacuum generator 30 has a control valve 32 for controlling the intake speed and maintaining the vacuum level.

[0021] The operating handle 40 is disposed on the cover 10. The operating handle 40 is used to facilitate handling and fix the vacuum cover to the workpiece. There are two operating handles 40, which are located on the left and right sides of the top of the cover 10, respectively. At the same time, the operating handle 40 can also be equipped with fixing devices such as buckles, magnets, vacuum suction cups or temporary fastening clamps to ensure that the vacuum cover is in close contact with the workpiece surface and the position is stable during the inspection process.

[0022] The vacuum gauge 50 is mounted on the housing 10. Located outside the housing 10 and communicating with the cavity 101, the vacuum gauge 50 monitors the vacuum level within the cavity 101 to ensure it reaches the negative pressure level required by the detection method. In this embodiment, the vacuum gauge 50 has a connecting tube 51, which is inserted into the second mounting hole 103 and extends into the cavity 101.

[0023] In addition, the cover 10 is provided with reinforcing ribs 60 or a metal frame on its exterior or interior to prevent excessive deformation of the cover 10 under negative pressure, thus ensuring sealing performance and structural stability. In this embodiment, the reinforcing ribs 60 are located in the cavity 101, but this is not a limitation.

[0024] The usage method of this embodiment is described in detail below: The working principle of this weld inspection vacuum hood is based on "negative pressure sealing" and "local environment control": 1. Create a negative pressure sealed space: (1) Press the sealing element 20 of this product tightly onto the surface of the weld to be inspected and the workpiece around it to ensure good contact.

[0025] (2) The air inlet of the vacuum generator 30 is connected through the air extraction pipe 31. The vacuum generator 30 generates a vacuum to evacuate the cavity 101 inside the cover 10. As the air inside the cavity 101 is extracted, the pressure inside the cavity 101 gradually decreases, forming a negative pressure (vacuum degree) relative to the external atmospheric pressure.

[0026] (3) Under the action of external atmospheric pressure, the cover 10 is pressed tightly against the surface of the workpiece, and the seal 20 is further compressed, thereby achieving a reliable seal between the cover 10 and the workpiece, and surrounding the weld area in a relatively independent closed negative pressure space.

[0027] Implement weld inspection function: (1) Vacuum leak detection (bubble method): This is one of the most commonly used applications. After a vacuum is formed, the other side (usually the inner side) of the weld of the workpiece to be inspected is immersed in water or coated with a foaming liquid such as soapy water. If there is a leak defect in the weld, water or air from the outside will enter the housing through the leak hole under the action of pressure difference. In water, this will be manifested as continuous bubbles being generated in the observation window 11, thus indicating the location of the leak. Alternatively, water can be filled into the housing 10 (at this time, the housing 10 may be designed to be at normal pressure, and a vacuum is drawn inside the workpiece, the principle is similar but the direction is reversed), and the outer surface of the weld can be observed for bubbles.

[0028] (2) Other detection under vacuum: Under a stable negative pressure environment, other detection methods can also be used. For example, a camera can be installed in the cavity 101 to collect and analyze images of the weld surface; or when performing wet magnetic particle detection, the vacuum can be used to uniformly adsorb the magnetic suspension onto the weld surface to improve the detection sensitivity.

[0029] (3) Tracer gas leak detection: If helium mass spectrometry leak detection is used, helium can be filled into the inside of the workpiece (if feasible), and a vacuum hood can be used to cover the outer weld area and connected to the helium mass spectrometer leak detector. If there is a leak in the weld, helium will leak into the hood and be detected by the leak detector. Conversely, helium can also be filled into the vacuum hood, and a vacuum can be drawn inside the workpiece to connect the leak detector.

[0030] Pressure balance and maintenance: (1) A predetermined vacuum level is maintained inside the housing 10 by closing the control valve 32. A vacuum gauge 50 (usually connected to the evacuation port or housing 10) is used to monitor the vacuum level inside the chamber 101 to ensure that it reaches the negative pressure level required by the detection method.

[0031] (2) After the test is completed, slowly introduce air into the cavity 101 by opening the control valve 32 to balance the internal and external pressures, and then the vacuum cover can be safely removed.

[0032] The key design feature of this invention is that by incorporating a sealing element and a vacuum generator on the enclosure, along with an observation window, this product can perform vacuum sealing on weld seams. This provides a controllable environment for weld seams (especially those in pressure-bearing equipment with high sealing requirements), facilitating observation or the introduction of testing media. This enables effective evaluation of weld seam quality and brings convenience to testing operations.

[0033] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A vacuum hood for weld inspection, characterized in that: It includes a housing, a seal, a vacuum generator, an operating handle, and a vacuum gauge; the housing has an opening-oriented cavity, and the housing has an observation window for observing the interior of the cavity; the seal is located at the bottom of the housing and surrounds the periphery of the cavity opening; the vacuum generator is located on the housing and connects the cavity to the outside; the operating handle is located on the housing; the vacuum gauge is located on the housing, outside the housing, and communicates with the cavity.

2. The weld inspection vacuum hood as described in claim 1, characterized in that: The cover is made of a lightweight, high-strength material with a certain degree of rigidity.

3. The weld inspection vacuum hood as described in claim 2, characterized in that: The cover is made of acrylic, aluminum alloy, engineering plastic or stainless steel sheet.

4. The weld inspection vacuum hood as described in claim 1, characterized in that: The seal is made of nitrile rubber or silicone rubber.

5. The weld inspection vacuum hood as described in claim 1, characterized in that: The top of the cover has a first mounting hole that connects the outside and the cavity. The vacuum generator is located at the top of the cover and has an exhaust pipe that is inserted into the first mounting hole and extends into the cavity.

6. The weld inspection vacuum hood as described in claim 1, characterized in that: The vacuum generator has control valves.

7. The weld inspection vacuum hood as described in claim 1, characterized in that: The observation window is a transparent panel located at the top of the enclosure.

8. The weld inspection vacuum hood as described in claim 7, characterized in that: The transparent panel is made of high-strength tempered glass, acrylic sheet, or polycarbonate sheet.

9. The weld inspection vacuum hood as described in claim 1, characterized in that: The cover is provided with reinforcing ribs or a metal frame on its exterior or interior.

10. The weld inspection vacuum hood as described in claim 1, characterized in that: The top of the cover has a second mounting hole that connects the outside world and the cavity. The vacuum gauge has a connecting tube that is inserted into the second mounting hole and extends into the cavity.

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