Weld joint tightness inspection device and inspection method

Abstract

The invention relates to the technical field of weld joint tightness inspection, and particularly discloses a weld joint tightness inspection device and method, and the device comprises a first inspection groove, a second inspection groove, and a third inspection groove. The second inspection groove is arranged on the periphery of the first inspection groove, and the third inspection groove is arranged on the periphery of the second inspection groove. The welding seam tightness inspection method comprises the following steps: (1) enabling the first inspection groove to correspond to a to-be-inspected welding seam; (2) vacuumizing the first inspection groove; (3) synchronously performing negative pressure pumping on the second inspection groove and the third inspection groove; (4) the obtained negative pressure values of the second inspection groove and the third inspection groove are equal to A, the obtained negative pressure value of the first inspection groove is B, and A is larger than B; (5) observing the change of the three air pressure values along with time; and (6) analyzing and judging the welding seam tightness according to the change conditions of the three groups of air pressure values. According to the invention, the accuracy of judging whether air leakage comes from the equipment can be improved, and the reliability and the accuracy of detection data are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of weld tightness inspection, and particularly relates to a weld tightness inspection device and an inspection method. Background Art

[0002] During the navigation of a ship, it will be affected by various environmental factors such as sea waves, sea winds, and corrosion, which will cause damage or failures in the hull structure, equipment, and systems. As a key part of the ship structure connection, the tightness of the weld is directly related to the safety and normal operation of the ship. Therefore, it is necessary to regularly carry out ship maintenance inspection and weld tightness inspection. On the one hand, it can timely detect problems in the welded parts of the hull and repair them to ensure the integrity and tightness of the ship structure and guarantee the navigation safety of the ship; on the other hand, it can extend the service life of the equipment and systems and reduce the maintenance and replacement costs caused by weld problems. In addition, timely detecting and solving weld tightness problems can avoid ship stoppage and delays caused by equipment failures and improve the operation efficiency of the ship.

[0003] Currently, a non-hermetic chamber weld tightness inspection device made of plexiglass is generally used. The structure of this device consists of a cover body, and then a sealing glue is provided around the bottom of the cover body. When in use, the device is attached to the hull weld to be detected, and then the cavity in the cover body is evacuated. The cover body is pressed against the hull wall by atmospheric pressure, and the change of the pressure value is checked through the pressure gauge on the cover body, and the weld tightness is judged by the change of the pressure gauge. However, the following technical problems are found in the long-term practical application of the above solution: Since the shipyard is built by the sea, the sealing glue of the cover body is easily micro-cracked due to sea wind corrosion and weathering, which is difficult to detect during the weld tightness inspection process. Moreover, it is impossible to effectively judge whether the change of the air pressure in the cover body is due to the weld or the tightness problem of the cover body itself, and there will be a situation where the detection result is incorrect. Summary of the Invention

[0004] The present invention provides a weld tightness inspection device and an inspection method to solve the technical problems existing in the background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A weld tightness inspection device includes a first inspection tank, a second inspection tank, and a third inspection tank; the second inspection tank is arranged on the outer periphery of the first inspection tank, and the first inspection tank and the second inspection tank form a zigzag or circular shape; the third inspection tank is arranged on the outer periphery of the second inspection tank, and the second inspection tank and the third inspection tank form a zigzag or circular shape; the first inspection tank is provided with a first air extraction hole, the second inspection tank is provided with a second air extraction hole; the third inspection tank is provided with a third air extraction hole; sealing assemblies are respectively arranged at the lower parts of the side walls of the first inspection tank, the second inspection tank, and the third inspection tank.

[0007] Optionally, the first inspection tank is provided with a first air pressure detection device, and the second inspection tank is provided with a second air pressure detection device; the third inspection tank is provided with a third air pressure detection device.

[0008] Optionally, a plurality of first reinforcing ribs are arranged between the first inspection tank and the second inspection tank; a plurality of second reinforcing ribs are arranged between the second inspection tank and the third inspection tank.

[0009] Optionally, the sealing assembly includes an inner sealing ring and an outer sealing ring, and a circle of prefabricated grooves are arranged between the inner sealing ring and the outer sealing ring; an airbag pad is arranged in the prefabricated grooves; the sectional view of the airbag pad is in a convex shape.

[0010] Optionally, the airbag pad includes a shelving rack, the shelving rack includes an outer side wall and an inner side wall, and the outer side wall and the inner side wall are connected by an elastic member; elastic membranes are arranged at the lower parts of the outer side wall and the inner side wall; the inner cavity of the airbag pad is filled with gas.

[0011] Optionally, both sides of the elastic membrane extend below the inner sealing ring and the outer sealing ring. Optionally, top membranes are arranged at the upper parts of the outer side wall and the inner side wall.

[0012] A weld tightness inspection method includes using the above-mentioned weld tightness inspection device to conduct weld tightness inspection, and the steps are as follows:

[0013] (1) Cover the weld tightness inspection device on the object to be detected, and the first inspection tank corresponds to the weld to be inspected;

[0014] (2) Evacuate the first inspection tank;

[0015] (3) Synchronously evacuate the second inspection tank and the third inspection tank to a negative pressure;

[0016] (4) After stopping the air extraction, obtain that the negative pressure values of the second inspection tank and the third inspection tank are equal to A, the negative pressure value of the first inspection tank is B, and A > B;

[0017] (5) Observe the variation of the air pressure values in the first inspection tank, the second inspection tank, and the third inspection tank over time;

[0018] (6) Analyze and judge the weld tightness based on the variation of the three groups of air pressure values.

[0019] Optionally, in step (3), connect the second air extraction hole of the second inspection tank to the third air extraction hole of the third inspection tank, and then extract negative pressure together.

[0020] Optionally, the analysis and judgment in step (6) include:

[0021] (1) If the air pressure value in the first inspection tank finally shows no change, it is judged that the weld tightness is good;

[0022] (2) If the air pressure value in the first inspection tank increases and the air pressure value in the second inspection tank shows no fluctuation, it is judged that the weld tightness is insufficient;

[0023] (3) If the air pressure value in the first inspection tank increases and the air pressure value in the second inspection tank decreases, it is judged that there is a problem with the tightness of the inspection device itself, and this test is invalidated.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. By providing the first inspection tank, the second inspection tank, and the third inspection tank, and comparing the variations of the three air pressure values, the present invention can improve the accuracy of judging whether the air leakage is from the equipment itself, and enhance the reliability and accuracy of the detection data.

[0026] 2. Preferably, metal materials such as aluminum plates are used as the framework of the device, and then transparent materials such as plexiglass are used for sealing at the top; with this solution, the metal materials have advantages such as good weldability, plasticity, and durability, improving the anti-collision performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0028] Figure 1 It is the top view of the weld tightness inspection device of the present invention;

[0029] Figure 2 It is the bottom view of the weld tightness inspection device of the present invention;

[0030] Figure 3 It is the cross-sectional view of the weld tightness inspection device of the present invention;

[0031] Figure 4 It is the cross-sectional view of the airbag pad of the present invention;

[0032] Figure 5 is a cross-sectional view of the airbag cushion of the present invention after being assembled to the side wall 7;

[0033] Figure 6 is Figure 5 a structural schematic diagram of the fitting state with the detected object;

[0034] Figure 7 is Figure 6 a structural schematic diagram of the weld tightness inspection device after evacuating negative pressure in Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] A weld tightness inspection device, as Figures 1 to 7As shown in the figure, it includes a first inspection tank 13, a second inspection tank 18, and a third inspection tank 19; the second inspection tank 18 is arranged on the outer periphery of the first inspection tank 13, and the first inspection tank 13 and the second inspection tank 18 form a zigzag or circular shape; the third inspection tank 19 is arranged on the outer periphery of the second inspection tank 18, and the second inspection tank 18 and the third inspection tank 19 form a zigzag or circular shape; the first inspection tank 13 is provided with a first air extraction hole 8, and a first valve is arranged on the first connecting pipe connecting the first air extraction hole 8; the second inspection tank 18 is provided with a second air extraction hole 9, and a second valve is arranged on the second connecting pipe connecting the second air extraction hole 9; the third inspection tank 19 is provided with a third air extraction hole 10, and a third valve is arranged on the third connecting pipe connecting the third air extraction hole 10; sealing assemblies are respectively arranged at the lower parts of the side walls of the first inspection tank 13, the second inspection tank 18, and the third inspection tank 19.

[0039] Optionally, the first inspection tank 13 is provided with a first air pressure detection device, and the first air pressure detection device can be a pressure gauge 5 or a pressure monitor; the second inspection tank is provided with a second air pressure detection device, and the second air pressure detection device can be a pressure gauge 4 or a pressure monitor; the third inspection tank is provided with a third air pressure detection device, and the third air pressure detection device can be a pressure gauge 3 or a pressure monitor. When using a pressure monitor, a model with time display / coordinate correspondence and real-time air pressure monitoring values can be preferably selected, which is beneficial for technicians to analyze the results during actual monitoring operations. When using a traditional pressure gauge, technicians need to check the time by themselves during the inspection process and synchronously record the data of the three air pressure values.

[0040] Optionally, a number of first reinforcing ribs 12 are arranged between the first inspection tank 13 and the second inspection tank 18; a number of second reinforcing ribs 11 are arranged between the second inspection tank 18 and the third inspection tank 19.

[0041] Optionally, as Figures 2 to 4As shown, the sealing assembly includes a first sealing assembly 15 disposed at the lower part of the side wall 7 of the first inspection groove 13, a second sealing assembly 17 disposed at the lower part of the side wall 6 of the second inspection groove 18, and a third sealing assembly 21 disposed at the lower part of the side wall 1 of the third inspection groove 19. In this embodiment, the first sealing assembly, the second sealing assembly, and the third sealing assembly have the same structure, including: an inner sealing ring 22 and an outer sealing ring 20. The inner sealing ring 22 and the outer sealing ring 20 can be made of common sealing materials such as rubber and silica gel. A circle of prefabricated grooves 14 is provided between the inner sealing ring 22 and the outer sealing ring 20; an airbag pad is provided in the prefabricated groove 14; the sectional view of the airbag pad is convex-shaped. During preparation, the side walls 1, 6, and 7 can preferably be made of metal materials such as aluminum plates as the skeleton of the device, and then the top is sealed with transparent materials such as plexiglass; under this solution, the metal material has the advantages of good weldability, plasticity, and durability, improving the anti-collision performance and service life.

[0042] Optionally, as Figure 4 shown, the airbag pad includes a shelving rack. The shelving rack includes an outer side wall 23 and an inner side wall 26. The outer side wall 23 and the inner side wall 26 are preferably made of hard materials. The outer side wall 23 and the inner side wall 26 are connected by elastic members 24, such as a plurality of elastic members 24 arranged at intervals; an elastic film 16 is provided at the lower parts of the outer side wall and the inner side wall. The elastic film 16 refers to a stretchable film with good extensibility, such as a latex film can be preferably selected; the inner cavity of the airbag pad is filled with gas. In this embodiment, a top layer film 25 made of a stretchable film is used to seal the tops of the outer side wall 23 and the inner side wall 26. The function is that after the elastic film 16 is squeezed, the air pressure in the inner cavity of the airbag pad increases, which in turn causes the top layer film 25 to bulge and reduce the pressure, further improving the fitting effect of the contact surface between the elastic film 16 and the detection object 27.

[0043] Optionally, both sides of the elastic film 16 extend below the inner sealing ring and the outer sealing ring.

[0044] The function of the elastic film 16 in this embodiment is: as Figure 6 shown, for conventional sealing materials such as rubber materials, after long-term use, the flexibility decreases. For the surface of the detection object 27 (the surface of the hull is non-smooth and concave-convex under the microscope), at this time, the elastic film 16 inflated through the inner cavity realizes the filling effect as Figure 6 shown. At the same time, during the process of performing a negative pressure pumping operation, a sealing bulge 28 can also be formed gradually at the inner and outer ends as Figure 7 shown, further reducing the impact of the decrease in density caused by the long-term use of conventional sealing rings. In this embodiment, the airbag pad is detachably arranged, and the elasticity of the elastic members 24 is deformable, which is beneficial for disassembly and assembly operations and the fixation of the airbag pad.

[0045] A method for inspecting the tightness of a weld seam includes using a weld seam tightness inspection device as described above to inspect the tightness of the weld seam, and the steps are as follows:

[0046] (1) Cover the weld seam tightness inspection device on the object to be detected, and the first inspection tank corresponds to the weld seam to be inspected;

[0047] (2) Connect the air extraction pipe to the first connecting pipe, open the first valve, and evacuate the first inspection tank;

[0048] (3) Synchronously evacuate the second inspection tank and the third inspection tank to a negative pressure; during the process of evacuating to a negative pressure, as shown, due to the gradual decrease of the external air pressure on the inner and outer sides of the elastic membrane 16, the sealing bulge 28 bulges, further improving the tightness of the contact surface between the lower part of the side wall 7 and the detected object 27; Figures 6 to 7 As shown, due to the gradual decrease of the external air pressure on the inner and outer sides of the elastic membrane 16, the sealing bulge 28 bulges, further improving the tightness of the contact surface between the lower part of the side wall 7 and the detected object 27;

[0049] (4) After stopping the air extraction, close the first valve, the second valve and the third valve, and obtain that the negative pressure values of the second inspection tank and the third inspection tank are equal to A, and the negative pressure value of the first inspection tank is B, and A > B;

[0050] (5) Observe the change of the air pressure values in the first inspection tank, the second inspection tank and the third inspection tank over time;

[0051] (6) Analyze and judge the tightness of the weld seam according to the change of the three groups of air pressure values.

[0052] Optionally, in the step (3), connect the second air extraction hole of the second inspection tank and the third air extraction hole of the third inspection tank, and then connect them together to an air extraction pipe (equipped with a main air valve), evacuate to a negative pressure, close the main air valve after reaching the set value, and then close the second valve and the third valve, and close the second air extraction hole and the third air extraction hole to make the second inspection tank and the third inspection tank independent of each other.

[0053] Optionally, the analysis and judgment in the step (6) includes:

[0054] (1) If the air pressure value in the first inspection tank finally does not change, it is judged that the tightness of the weld seam is good;

[0055] (2) If the air pressure value in the first inspection tank rises and the air pressure value in the second inspection tank does not fluctuate, it is judged that the tightness of the weld seam is insufficient;

[0056] (3) If the air pressure value in the first inspection tank rises and the air pressure value in the second inspection tank drops, it is judged that there is a problem with the tightness of the inspection device itself, and this test is invalidated.

[0057] (4) Other situations are as follows: If the air pressure value in the first inspection tank increases, and the air pressure value in the second inspection tank shows no fluctuation, while the air pressure value in the third inspection tank increases, it is judged to belong to situation (2), that is, the weld tightness is insufficient.

[0058] Using the above detection scheme, the functions of arranging the first inspection tank 13, the second inspection tank 18 and the third inspection tank 19 can be obtained as follows:

[0059] Combined with Figure 2 Analysis: An accurate judgment can be obtained by checking the changes in the air pressure values of the three inspection tanks, namely the first inspection tank 13, the second inspection tank 18 and the third inspection tank 19. For example, if the air pressure in the first inspection tank 13 rises, the air pressure in the second inspection tank 18 drops, and the air pressure in the third inspection tank 19 remains unchanged, it is possible that the leak in this detection comes from the first seal assembly 15, indicating the technician to re-measure; the third inspection tank 19 serves as a barrier to the external air pressure. If the air pressure in the third inspection tank 19 rises, it is necessary to consider whether it is the third seal assembly 21 that leaks or the first seal assembly 15 and the second seal assembly 17 by checking the air pressure change of the second inspection tank 18 based on the time axis. If the air pressure in the third inspection tank 19 rises due to the leakage of the first seal assembly 15 and the second seal assembly 17, this experiment is valid, and it is judged that the weld tightness is insufficient. Other situations cannot be stated one by one in this embodiment.

[0060] In some embodiments, this weld tightness inspection device can be used for weld tightness inspection. It can also be that the air pressure value of the first inspection tank 13 is a, the air pressure value of the second inspection tank 18 is b, and the air pressure value of the third inspection tank 19 is c. Optionally, atmospheric pressure > c > b > a, and the air pressure value is gradually reduced from the outer layer to the inner layer, reducing the situation of air leakage in the device itself, reducing repeated operations, improving work efficiency, and once air leakage occurs, directly judging whether the detection data is reliable based on the values of c and b.

Claims

1. A weld tightness inspection device, characterized in that: It includes a first inspection tank, a second inspection tank and a third inspection tank; The second inspection tank is arranged on the outer periphery of the first inspection tank, and the first inspection tank and the second inspection tank form a zigzag or annular shape; the third inspection tank is arranged on the outer periphery of the second inspection tank, and the second inspection tank and the third inspection tank form a zigzag or annular shape; the first inspection tank is provided with a first air extraction hole, and the second inspection tank is provided with a second air extraction hole; the third inspection tank is provided with a third air extraction hole; sealing assemblies are respectively arranged at the lower parts of the side walls of the first inspection tank, the second inspection tank and the third inspection tank.

2. The weld tightness inspection device according to claim 1, wherein: The first inspection tank is provided with a first air pressure detection device, and the second inspection tank is provided with a second air pressure detection device; the third inspection tank is provided with a third air pressure detection device.

3. The weld tightness inspection device according to claim 1, wherein: A number of first reinforcing ribs are arranged between the first inspection tank and the second inspection tank; a number of second reinforcing ribs are arranged between the second inspection tank and the third inspection tank.

4. The weld tightness inspection device according to claim 1, characterized in that: The sealing assembly includes an inner sealing ring and an outer sealing ring, and a prefabricated groove is arranged between the inner sealing ring and the outer sealing ring; an airbag pad is arranged in the prefabricated groove; the sectional view of the airbag pad is convex-shaped.

5. The weld tightness inspection device according to claim 4, characterized in that: The airbag pad includes a shelving rack, and the shelving rack includes an outer side wall and an inner side wall, and the outer side wall and the inner side wall are connected by an elastic member; elastic membranes are arranged at the lower parts of the outer side wall and the inner side wall; the inner cavity of the airbag pad is filled with gas.

6. The weld tightness inspection device according to claim 5, characterized in that: Both the inner and outer sides of the elastic membrane extend below the inner sealing ring and the outer sealing ring.

7. The weld tightness inspection device according to claim 5, characterized in that: Top membranes are arranged at the upper parts of the outer side wall and the inner side wall.

8. A method for inspecting the tightness of a weld, characterized in that: It includes using a weld tightness inspection device as described in any one of claims 1 to 6 to conduct weld tightness inspection, and the steps are as follows: (1) Cover the weld tightness inspection device on the object to be detected, and the first inspection tank corresponds to the weld to be inspected; (2) Vacuum the first inspection tank; (3) Synchronously extract negative pressure from the second inspection tank and the third inspection tank; (4) After stopping air extraction, obtain that the negative pressure values of the second inspection tank and the third inspection tank are equal to A, the negative pressure value of the first inspection tank is B, and A > B; (5) Observe the change of the air pressure values in the first inspection tank, the second inspection tank and the third inspection tank over time; (6) Analyze and judge the weld tightness according to the change conditions of the three groups of air pressure values.

9. A weld tightness inspection method according to claim 8, characterized in that: In step (3), connect the second air extraction hole of the second inspection tank with the third air extraction hole of the third inspection tank, and then extract negative pressure together.

10. A method for inspecting the tightness of a weld seam according to claim 8, characterized in that: The analysis and judgment in step (6) include: (1) If the air pressure value in the first inspection tank finally has no change, it is judged that the weld tightness is good; (2) If the air pressure value in the first inspection tank rises and the air pressure value in the second inspection tank has no fluctuation, it is judged that the weld tightness is insufficient; (3) If the air pressure value in the first inspection tank rises and the air pressure value in the second inspection tank drops, it is judged that there is a problem with the tightness of the inspection device itself, and this test is invalid.

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