A wheeled fillet weld leak detection device

Abstract

The application discloses a kind of corner weld leakage detection devices with wheels.Vacuum detection box technical field is related to, including: the side of vacuum box is in contact with the tank wall of storage tank, the bottom corner of the side of vacuum box away from tank wall is set to be chamfered, vacuum pump is equipped on vacuum box, the two side walls adjacent to tank wall of vacuum box are all set to be openwork structure, vacuum box and the two side walls adjacent to tank wall are all equipped with guide rail on;Sealing sponge is set on the bottom of vacuum box and the side wall in contact with tank wall;Propeller is set two, two propellers are respectively set on two guide rails, and the electromagnet of each propeller is in contact with tank wall;Truckle is set on chamfered surface.The detection device is set on chamfered surface through truckle, and it is convenient to push vacuum box and move to next inspection position, and reduce labor intensity;Through setting vacuum pump, vacuum treatment is carried out to vacuum box;Through setting propeller, replace detection personnel and press sealing sponge, and it is simple to operate, time-saving and labor-saving.

Description

[0001] This application is a divisional application. The original application number is 202311253470.4, the application date is September 26, 2023, and the invention title is "A Leak Detection Device for Fillet Welds with Wheels". Technical Field

[0002] This invention relates to the field of vacuum testing box technology, and more specifically to a wheeled fillet weld leak detection device. Background Technology

[0003] Vacuum chamber leak detection is a commonly used method, such as leak detection of weld seams on the bottom plate of oil tanks. Weld seams are further divided into butt welds, lap welds, and fillet welds.

[0004] Compared to inspecting leaks in butt welds, inspecting leaks in fillet welds is more challenging because the fillet welds of storage tanks consist of the bottom plate and the tank wall at a 90° angle. To detect leaks in a vacuum chamber, the base materials of the tank wall and bottom plate, as well as the fillet weld connecting them, must be sealed together at the edge of the vacuum chamber using a soft sealing material. This is achieved by connecting two Π-shaped sealing rings—one on the tank bottom and one on the tank wall—with the openings of the two Π rings facing the fillet weld, effectively connecting them at a 90° angle. Only by ensuring an initial seal can leaks in the fillet weld at that location be detected.

[0005] Typically, the bottom and wall of a tank form a 90° angle. To completely seal this 90° angle with the high-density foam in the vacuum chamber, inspectors must apply pressure to both the bottom and horizontal directions simultaneously. This unique structure is akin to inspectors facing a high wall, with the inspection position located in a very low corner. The tank's inner wall is almost smooth, leaving inspectors with nothing to hold onto, making it difficult to exert force. Furthermore, the distance between the top edge of the vacuum chamber and the bottom is generally no more than 300 mm, forcing inspectors to work in a crouching or stooped position. Given these two factors, it's extremely difficult for inspectors to apply horizontal pressure to the vacuum chamber, typically requiring a significant amount of time and effort to complete an inspection.

[0006] Besides the sealing issue, another major problem is the weight of the vacuum chamber. When using a vacuum chamber for leak detection, the chamber is placed on the location to be tested. The inspector squats down and applies pressure to ensure a tight seal between the chamber's edges and the object being tested. A vacuum pump then evacuates the inside of the chamber. Once the vacuum level reaches the standard negative pressure value, leaks can be checked through the transparent window of the chamber. After testing, the air inlet valve is opened to fill the chamber with air. Only after the negative pressure inside the chamber reaches zero can the inspector move the vacuum chamber to the next testing location, and this process is repeated.

[0007] Because vacuum chambers have a certain weight, typically ranging from 5 to 10 kilograms, if the number of welds to be inspected is large, such as a 50,000 cubic meter storage tank with a diameter of approximately 60 meters, the length of its fillet welds would be about 180 meters. If each inspection is for a length of 0.4 meters, then inspectors would need to squat and stand up more than 400 times to complete the inspection of a single tank's fillet weld, and would also need to move the vacuum chamber, inevitably expending a great deal of physical strength. Since inspectors need to perform repetitive actions of crouching, applying pressure, standing up, and moving the vacuum chamber to complete the inspection of one location, it would also waste a lot of time, resulting in very low efficiency. In addition, if a leak is found, inspectors would have to exert a lot of effort, even kneeling, to apply pressure to the vacuum chamber. This is often too much for one person and sometimes requires two people to do. If there is still leakage at the corners, towels, scraps of cloth, old clothes, or old fabrics soaked in water must be used to surround the area around the chamber to ensure a seal, which is also time-consuming and labor-intensive.

[0008] Therefore, how to provide a convenient, wheeled fillet weld leak detection device that is easy for inspectors to operate and avoids the need for manual handling has become a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0009] In view of this, the present invention provides a wheeled fillet weld leakage detection device, which aims to solve one of the problems in the above-mentioned background art, making it convenient for inspection personnel to operate and avoiding movement.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A wheeled fillet weld leak detection device for detecting fillet welds in storage tanks, comprising: A vacuum chamber, one side of which is in contact with the tank wall of the storage tank, the bottom corner of the side of the vacuum chamber away from the tank wall is set as a beveled surface, a vacuum pump is provided on the vacuum chamber and the vacuum pump is connected to the vacuum chamber, both side walls of the vacuum chamber adjacent to the tank wall are set as hollow structures, and both side walls of the vacuum chamber adjacent to the tank wall are provided with guide rails. Sealing sponge, the sealing sponge being disposed at the bottom of the vacuum chamber and on the side wall in contact with the chamber wall; The propeller has two propellers, which are respectively mounted on two guide rails. Each propeller has an electromagnet at one end near the tank wall, and each electromagnet is in contact with the tank wall. Casters, which are disposed on the beveled surface.

[0011] Furthermore, the propeller includes a slider, a main beam, and a pull rod. The slider is slidably mounted on the guide rail. The main beam is mounted on the slider. A cavity is formed at one end of the main beam near the tank wall. A spring is provided inside the cavity. An anti-detachment post is also provided inside the cavity. The anti-detachment post is fixedly mounted on the side of the cavity near the tank wall. One end of the pull rod is sleeved on the anti-detachment post and contacts the spring. The other end of the pull rod is connected to the electromagnet. The spring is located between the cavity and the pull rod.

[0012] Furthermore, the propulsion device also includes a drive motor, a push rod shaft cavity, and a push rod. The drive motor is located at the end of the main beam away from the tank wall and between the main beam and the vacuum chamber. The push rod shaft cavity is connected to the end of the drive motor near the tank wall, and the push rod is connected to the other end of the push rod shaft cavity. The push rod is telescopically disposed within the push rod shaft cavity.

[0013] Furthermore, it also includes an air inlet valve and an air extraction valve. The air inlet valve is located on the top of the vacuum chamber, and the air extraction valve is located on the side wall of the vacuum chamber adjacent to the tank wall. The air extraction valve is connected to the vacuum pump, and the air inlet valve is connected to the vacuum chamber through an air inlet pipe.

[0014] Furthermore, it also includes a handrail, which is configured as an inverted U-shape. The two ends of the handrail are respectively connected to the two side walls adjacent to the vacuum box and the tank wall, and a fixed seat is provided on the handrail.

[0015] Furthermore, it also includes a control switch, which is disposed on the mounting base.

[0016] Furthermore, it also includes an acrylic observation window, a safety valve, and a vacuum gauge. The vacuum gauge is located at the top of the vacuum chamber and is connected to the vacuum chamber via a pipeline. The safety valve is located on the pipeline between the vacuum gauge and the vacuum chamber. The acrylic observation window is located at the top of the vacuum chamber.

[0017] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a wheeled fillet weld leakage detection device. By setting casters on the beveled surface, it is convenient to push the vacuum box to the next inspection position, reducing labor intensity; by setting a vacuum pump to evacuate the vacuum box; by setting a pusher to replace the inspection personnel in applying pressure to the sealing sponge, it assists the vacuum box in detecting whether the fillet weld is leaking. The operation is simple, time-saving, labor-saving and work efficiency is improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 A schematic diagram of the wheeled fillet weld leakage detection device provided by the present invention; Figure 2 This is a schematic diagram of the thruster provided by the present invention.

[0020] Wherein: 1 is the vacuum chamber; 2 is the tank wall; 3 is the beveled surface; 4 is the guide rail; 5 is the sealing sponge; 6 is the pusher; 7 is the caster; 8 is the slider; 9 is the main beam; 10 is the pull rod; 11 is the electromagnet; 12 is the cavity; 13 is the spring; 14 is the anti-detachment column; 15 is the push motor; 16 is the push rod shaft cavity; 17 is the push rod; 18 is the air inlet valve; 19 is the air extraction valve; 20 is the air inlet pipe; 21 is the handrail; 22 is the fixed base; 23 is the control switch; 24 is the acrylic observation window; 25 is the safety valve; 26 is the screw; 27 is the electromagnet control switch; 28 is the push rod motor forward and reverse switch; 29 is the vacuum gauge. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] See Figure 1-2 This invention discloses a wheeled fillet weld leakage detection device for detecting fillet welds in storage tanks, comprising: Vacuum box 1, one side of vacuum box 1 is in contact with the tank wall 2 of the storage tank, the bottom corner of the side of vacuum box 1 away from the tank wall 2 is set as a beveled surface 3, vacuum box 1 is equipped with a vacuum pump, the vacuum pump is connected to vacuum box 1, and the vacuum box 1 is evacuated by setting the vacuum pump; the two side walls of vacuum box 1 adjacent to the tank wall 2 are both set as hollow structures, and guide rails 4 are provided on the two side walls of vacuum box 1 adjacent to the tank wall 2. Sealing sponge 5 is set at the bottom of vacuum chamber 1 and on the side wall in contact with the tank wall 2. The sealing sponge 5 can be reused, which facilitates the testing. Two pushers 6 are provided, and the two pushers 6 are respectively set on two guide rails 4. Each pusher 6 has an electromagnet 11 at the end near the tank wall 2. Each electromagnet 11 is in contact with the tank wall 2. By setting the pushers 6, the pressure is applied to the sealing sponge 5 instead of the inspection personnel. The operation is simple, time-saving, labor-saving and work efficiency is improved. Casters 7 are installed on the inclined surface 3. By installing casters 7 on the inclined surface 3, it is convenient to push the vacuum box 1 to the next inspection position, thus reducing labor intensity.

[0023] In this embodiment, the pusher 6 includes a slider 8, a main beam 9, and a pull rod 10. The slider 8 is slidably mounted on the guide rail 4. The main beam 9 is mounted on the slider 8. A cavity 12 is provided at one end of the main beam 9 near the tank wall 2. A spring 13 is provided inside the cavity 12. An anti-detachment column 14 is also provided inside the cavity 12. The anti-detachment column 14 is fixedly mounted inside the cavity 12 on the side near the tank wall 2. One end of the pull rod 10 is sleeved on the anti-detachment column 14 and contacts the spring 13. The other end of the pull rod 10 is connected to an electromagnet 11. The spring 13 is located between the cavity 12 and the pull rod 10.

[0024] In this embodiment, the thruster 6 also includes a drive motor 15, a push rod shaft cavity 16, and a push rod 17. The drive motor 15 is located at the end of the main beam 9 away from the tank wall 2 and is located between the main beam 9 and the vacuum chamber 1. The push rod shaft cavity 16 is connected to the end of the drive motor 15 near the tank wall 2, and the push rod 17 is connected to the other end of the push rod shaft cavity 16. The push rod 17 is telescopically located within the push rod shaft cavity 16.

[0025] In this embodiment, an air inlet valve 18 and an air extraction valve 19 are also included. The air inlet valve 18 is located on the top of the vacuum chamber 1, and the air extraction valve 19 is located on the side wall of the vacuum chamber 1 adjacent to the tank wall 2. The air extraction valve 19 is connected to the vacuum pump, and the air inlet valve 18 is connected to the vacuum chamber 1 through the air inlet pipe 20. By setting the air inlet valve 18, the vacuum chamber 1 is filled with air; by setting the air extraction valve 19, the vacuum pump is assisted in evacuating the vacuum chamber 1.

[0026] In this embodiment, a handrail 21 is also included. The handrail 21 is configured as an inverted U-shape. The two ends of the handrail 21 are respectively connected to the two side walls adjacent to the vacuum chamber 1 and the tank wall 2. A fixed seat 22 is provided on the handrail 21. The vacuum chamber 1 is pushed to the next inspection position by the auxiliary casters 7 of the handrail 21.

[0027] In this embodiment, a control switch 23 is also included. The control switch 23 is mounted on the fixed base 22 and controls the electromagnet 11 and the drive motor 15.

[0028] In this embodiment, an acrylic observation window 24, a safety valve 25, and a vacuum gauge 29 are also included. The vacuum gauge 29 is located at the top of the vacuum chamber 1 and is connected to the vacuum chamber 1 via a pipeline. The safety valve 25 is located on the pipeline between the vacuum gauge 29 and the vacuum chamber 1. The acrylic observation window 24 is located at the top of the vacuum chamber 1. By setting the safety valve 25, the vacuum level inside the vacuum chamber 1 will be maintained at a constant value, which can save time and reduce workload. The acrylic observation window 24 is used to observe the internal condition of the vacuum chamber 1. The vacuum gauge is used to detect the vacuum condition inside the vacuum chamber 1.

[0029] In addition, in this embodiment, the guide rail 4 is fixed to the vacuum chamber 1 by screws 26, the slider 8 is slidably mounted on the guide rail 4, the main beam 9 is fixed to the slider 8 by screws 26, the push motor 15 is fixed to the main beam 9 by screws 26, the end of the push rod 17 away from the push rod shaft cavity 12 is fixed to the main beam 9 by screws 26, and the anti-detachment column 14 is fixed in the spring 13 cavity 12 by screws 26.

[0030] The control switch 23 includes an electromagnet control switch 27 and a forward / reverse switch 28 for driving the motor.

[0031] It is also equipped with a light and a light switch. The light is located inside the vacuum chamber 1, and the light switch is located on the top of the vacuum chamber 1. The light switch controls the light to illuminate the inside of the vacuum chamber 1, which helps to better observe the situation inside the vacuum chamber 1. The light is an LED light.

[0032] The top of the vacuum chamber 1 is also equipped with a charging socket and a power indicator screen, which are used to observe the remaining power of the device and charge it.

[0033] It also includes a power supply mechanism, which consists of a battery compartment and a lithium battery. The battery compartment is located on the outer wall of the enclosure, and the lithium battery is located inside the battery compartment. The LED lighting is electrically connected to the lithium battery.

[0034] Working principle: First, a foaming agent is sprayed onto the fillet weld of the area to be inspected. Then, the vacuum chamber 1 is placed against the tank wall 2. The air inlet valve 18 is closed, and the electromagnet control switch 27 is turned on, so that the electromagnet 11 is firmly attracted to the tank wall 2, serving as a fixing point for the main beam 9. The vacuum pump is turned on to evacuate the vacuum chamber 1. The forward and reverse switch 28 of the push motor is turned on, so that the push motor 15 pushes out the push rod 17. Since the main beam 9 has no elasticity, and the front end of the push rod 17 is fixed to the vacuum chamber 1, as the push rod 17 is pushed out, the vacuum chamber 1 is pushed towards the tank wall 2, thus sealing the seam. The foam 5 is compressed horizontally, while the sealing foam 5 at the bottom of the vacuum chamber 1 is compressed vertically under the gravity of the vacuum chamber 1. After the push rod 17 is pushed to a certain extent, the sealing foam 5 on the outer edge of the vacuum chamber 1 completely seals the vacuum chamber 1. When the pointer of the vacuum gauge 29 starts to rotate, the vacuum chamber 1 will move rapidly in both horizontal and vertical directions simultaneously under the action of external atmospheric pressure. In order to prevent this movement from damaging the drive motor 15, the electromagnet control switch 27 is turned off in time to demagnetize the electromagnet 11. At this time, the electromagnet 11 is in a free state.

[0035] In addition, if the vacuum chamber 1 moves too far towards the tank wall 2, it may also damage the drive motor 15. To avoid this, a cavity 12 is provided at the front end of the main beam 9 of the pusher 6. The spring 13 cavity is equipped with a spring 13 and an anti-detachment column 14 to prevent the pull rod 10 from being pulled off. This allows the pull rod 10 to move in the opposite direction when the vacuum chamber 1 moves rapidly towards the tank wall 2, that is, to retract into the cavity 12. The spring 13 is compressed. The cavity 12 has sufficient length, so there is sufficient compression. The purpose of this design is to prevent damage to the drive motor 15 under any circumstances. After the detection of this position is completed and the vacuum chamber 1 is removed, the spring 13 pushes the pull rod 10 back to its original position.

[0036] Once the vacuum level inside vacuum chamber 1 reaches the set value, the vacuum level inside vacuum chamber 1 will remain at a constant value due to the action of safety valve 25 without shutting down the vacuum pump. This can save time and reduce workload. At this time, the inspector can observe whether there is a leak through the acrylic observation window 24. After the inspection is completed, open the air inlet valve 18 to fill the vacuum chamber 1 with air, turn on the forward and reverse switch 28 of the drive motor, retract the push rod 17, tilt the vacuum chamber 1 so that the caster 7 touches the ground, and then lift the vacuum chamber 1 off the ground. The vacuum chamber 1 can be pushed to the next inspection position by the handrail 21. Repeating the above actions can complete the leak detection of the fillet weld of the tank bottom plate.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wheeled fillet weld leak detection device for detecting fillet weld leaks in storage tanks, characterized in that, include: A vacuum chamber, one side of which is in contact with the tank wall of the storage tank, the bottom corner of the side of the vacuum chamber away from the tank wall is set as a beveled surface, a vacuum pump is provided on the vacuum chamber and the vacuum pump is connected to the vacuum chamber, both side walls of the vacuum chamber adjacent to the tank wall are set as hollow structures, and both side walls of the vacuum chamber adjacent to the tank wall are provided with guide rails. Sealing sponge, the sealing sponge being disposed at the bottom of the vacuum chamber and on the side wall in contact with the chamber wall; The propeller has two propellers, which are respectively mounted on two guide rails. Each propeller has an electromagnet at one end near the tank wall, and each electromagnet is in contact with the tank wall. Casters, the casters being disposed on the inclined surface; The pusher includes a slider, a main beam, and a pull rod. The slider is slidably mounted on the guide rail. The main beam is mounted on the slider. A cavity is formed at one end of the main beam near the tank wall. A spring is installed in the cavity. An anti-detachment post is also installed in the cavity. The anti-detachment post is fixedly mounted in the cavity on the side near the tank wall. One end of the pull rod is sleeved on the anti-detachment post and contacts the spring. The other end of the pull rod is connected to the electromagnet. The spring is located between the cavity and the pull rod. The propulsion device also includes a drive motor, a push rod shaft cavity, and a push rod. The drive motor is located at the end of the main beam away from the tank wall and between the main beam and the vacuum chamber. The push rod shaft cavity is connected to the end of the drive motor near the tank wall, and the push rod is connected to the other end of the push rod shaft cavity. The push rod is telescopically disposed within the push rod shaft cavity. It also includes an air inlet valve and an air extraction valve. The air inlet valve is located on the top of the vacuum chamber, and the air extraction valve is located on the side wall of the vacuum chamber adjacent to the tank wall. The air extraction valve is connected to the vacuum pump, and the air inlet valve is connected to the vacuum chamber through an air inlet pipe.

2. The wheeled fillet weld leakage detection device according to claim 1, characterized in that, It also includes a handrail, which is configured as an inverted U-shape. The two ends of the handrail are respectively connected to the two side walls adjacent to the vacuum box and the tank wall, and a fixed seat is provided on the handrail.

3. The wheeled fillet weld leakage detection device according to claim 2, characterized in that, It also includes a control switch, which is mounted on the mounting base.

4. The wheeled fillet weld leakage detection device according to claim 1, characterized in that, It also includes an acrylic observation window, a safety valve, and a vacuum gauge. The vacuum gauge is located at the top of the vacuum chamber and is connected to the vacuum chamber via a pipeline. The safety valve is located on the pipeline between the vacuum gauge and the vacuum chamber. The acrylic observation window is located at the top of the vacuum chamber.

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