A vacuum device for leak testing of the bottom weld of a storage tank.

Abstract

This utility model relates to the field of leak testing of tank bottom welds, specifically a vacuum device for leak testing of tank bottom welds, comprising a vacuum machine. The vacuum machine is characterized by having two connecting plates fixedly connected to both sides. An adjusting plate is provided on the inner wall of each connecting plate, and a support plate is fixedly connected to one side of the adjusting plate. A pre-fixing mechanism is provided inside the support plate. The pre-fixing mechanism includes a sliding sleeve fixedly connected to the inside of the support plate. A connecting rod is slidably connected to the inner wall of the sliding sleeve, and a mounting plate is fixedly connected to one end of the connecting rod. An electromagnet is fixedly connected to the bottom of the mounting plate. This utility model's vacuum device solves the technical defects of vacuum leak testing devices, which require manual pre-fixing before adsorption is activated due to the large volume of the vacuuming part, resulting in inconvenient operation, low efficiency, and potential injury to personnel.

Description

Technical Field

[0001] This utility model relates to the field of leak testing of bottom welds in storage tanks, specifically a vacuum device for leak testing of bottom welds in storage tanks. Background Technology

[0002] As core equipment for storing liquid or gaseous media in the petroleum, chemical, and energy fields, the sealing performance of the bottom weld of a storage tank directly affects the safe management of the stored media, environmental protection, and the operational stability of the equipment. Even a small leak in the bottom weld can lead to not only the loss of media and economic losses, but also major safety accidents such as fires, explosions, and environmental pollution. Therefore, the sealing performance testing of the bottom weld is a key quality control step in the manufacturing, installation, and maintenance of storage tanks. The vacuum leak test method has become one of the mainstream technologies for testing the sealing performance of the bottom weld of storage tanks due to its advantages such as simple operation, high detection sensitivity, and environmental friendliness. Its core principle is to create a stable vacuum environment on the surface of the weld and observe whether bubbles are generated by a tracer medium (such as soapy water) to determine whether there are leakage defects in the weld.

[0003] During the construction and maintenance of storage tanks, the sealing of the bottom weld is crucial. If a leak occurs at the bottom weld, it will not only lead to the waste of the stored medium, but may also cause safety accidents, posing a serious threat to the surrounding environment and personnel safety. However, the existing leak testing vacuum device has certain shortcomings in application. Because the pumping part of the device is large, when placing it on the storage tank, the user needs to manually fix it before the vacuum adsorption is activated. Only after the vacuum adsorption is fixed can the user release their hands. This process is not only labor-intensive and time-consuming, but also poses certain safety hazards. During the manual fixing process, the user may be injured due to improper operation or the device suddenly slipping. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes an air extraction device for a vacuum device for leak testing of the bottom weld of a storage tank, which solves the technical defects of the vacuum leak testing device, which is inconvenient to operate, inefficient, and prone to personnel injury due to the large volume of the air extraction part and the need for manual pre-fixation before starting the adsorption.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a vacuum device for leak testing of the bottom weld of a storage tank, including a vacuum machine, two connecting plates are fixedly connected to both sides of the vacuum machine, an adjusting plate is provided on the inner wall of the connecting plate, a support plate is fixedly connected to one side of the adjusting plate, and a pre-fixing mechanism is provided inside the support plate. The pre-fixing mechanism includes a sliding sleeve, which is fixedly connected to the inside of the support plate. A connecting rod is slidably connected to the inner wall of the sliding sleeve. One end of the connecting rod is fixedly connected to a mounting plate, and an electromagnet is fixedly connected to the bottom of the mounting plate.

[0006] Preferably, the vacuum machine includes a first fixed plate and a second fixed plate. Four reinforcing columns are fixedly connected to the bottom of the first fixed plate. The first and second fixed plates are fixedly connected via the reinforcing columns. A vacuum shell is fixedly connected between the inner walls of the first and second fixed plates. A rubber adsorption plate is fixedly connected to the bottom of the second fixed plate. Three through holes are opened at the bottom of the second fixed plate and are used in conjunction with the rubber adsorption plate. A gas pressure gauge is fixedly installed on one side of the vacuum shell, and a three-way pipe is fixedly connected to the other side of the vacuum shell. A first valve is fixedly installed at one end of the three-way pipe, and a second valve is fixedly installed on the other side of the three-way pipe. A vacuum connection pipe is fixedly installed on the inner wall of the second valve.

[0007] Preferably, the other end of the connecting rod is fixedly connected to a limiting plate, and a tension spring is movably sleeved on the surface of the connecting rod. The top of the tension spring is fixedly connected to the bottom of the limiting plate, and the other end of the tension spring is fixedly connected to the top of the support plate.

[0008] Preferably, a fixing post is fixedly connected to the top of the adjusting plate, the surface of the fixing post is in contact with the inner wall of the connecting plate, and a knob is threadedly connected to the inner wall of the fixing post, the bottom of the knob being in close contact with the top of the connecting plate.

[0009] Preferably, the inner wall of the connecting plate is provided with an adjustment groove, the inner cavity of the adjustment groove is in contact with the surface of the adjustment plate, and the top of the connecting plate is provided with a movable groove, the inner cavity of the movable groove is in contact with the surface of the fixed column.

[0010] Preferably, the inner wall of the support plate is provided with a mounting hole, and the inner cavity of the mounting hole is fixedly connected to the surface of the sliding sleeve.

[0011] Preferably, the inner wall of the fixing column is provided with a threaded hole, and the inner cavity of the threaded hole is threadedly connected to the surface of the knob.

[0012] The advantages of this utility model are: This invention, through the pre-fixing mechanism, eliminates the need for manual pre-fixation when placing the extraction device on the storage tank. When the extraction device approaches the tank, the electromagnet is energized, generating magnetism and attracting the device to the tank surface, thus initially fixing it. This process is quick and stable, avoiding the labor and time costs of manual fixing and eliminating potential safety hazards caused by manual operation, such as the device suddenly slipping and injuring the user. The tension spring ensures that the electromagnet returns to its original position after power is cut off, facilitating future use. The position of the support plate and pre-fixing mechanism can be adjusted according to actual needs by sliding the adjustment plate within the adjustment groove, adapting to storage tanks of different sizes and shapes. The threaded connection between the knob and the fixing column secures the adjusted position, ensuring the device's stability. Furthermore, the rational arrangement and connection methods of various components, such as the fixed connection between the mounting hole and the sliding sleeve, and the threaded connection between the threaded hole and the knob, make the entire extraction device compact, easy to install, and flexible to use, effectively improving the efficiency and safety of leak testing at the tank bottom weld. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2 This is a bottom-view perspective view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the connection of a partial mechanism of this utility model; Figure 4 This is an exploded view of a portion of the structure of this utility model; Figure 5 This is an exploded view of the knob and connecting plate of this utility model.

[0015] In the diagram: 1. Vacuum machine; 2. Pre-fixing mechanism; 201. Electromagnet; 202. Connecting rod; 203. Mounting plate; 204. Sliding sleeve; 3. Gas pressure gauge; 4. Connecting plate; 5. Reinforcing column; 6. Rubber adsorption plate; 7. Second fixing plate; 8. First valve; 9. T-connector; 10. Second valve; 11. Vacuum connecting pipe; 12. Limiting plate; 13. Vacuum shell; 14. Through hole; 15. Tension spring; 16. Knob; 17. Adjustment groove; 18. Adjustment plate; 19. Movable groove; 20. Support plate; 21. Threaded hole; 22. Fixing column; 23. Mounting hole; 24. First fixing plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0017] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail. This application discloses a vacuum device for leak testing of the bottom weld of a storage tank. (Refer to...) Figures 1-5 A vacuum device for leak testing of the bottom weld of a storage tank, wherein two connecting plates 4 are fixedly connected to both sides of the vacuum machine 1, an adjusting plate 18 is provided on the inner wall of the connecting plate 4, a support plate 20 is fixedly connected to one side of the adjusting plate 18, and a pre-fixing mechanism 2 is provided inside the support plate 20. The pre-fixing mechanism 2 includes a sliding sleeve 204, which is fixedly connected to the inside of the support plate 20. A connecting rod 202 is slidably connected to the inner wall of the sliding sleeve 204. One end of the connecting rod 202 is fixedly connected to a mounting plate 203, and an electromagnet 201 is fixedly connected to the bottom of the mounting plate 203. Reference Figure 1 and Figure 2The vacuum machine 1 includes a first fixed plate 24 and a second fixed plate 7. Four reinforcing columns 5 are fixedly connected to the bottom of the first fixed plate 24. The connection between the first fixed plate 24 and the second fixed plate 7 is secured by the reinforcing columns 5. A vacuum shell 13 is fixedly connected between the inner walls of the first fixed plate 24 and the second fixed plate 7. A rubber adsorption plate 6 is fixedly connected to the bottom of the second fixed plate 7. Three through holes 14 are provided at the bottom of the second fixed plate 7 and are used in conjunction with the rubber adsorption plate 6. A gas pressure gauge 3 is fixedly installed on one side of the vacuum shell 13, and a three-way pipe 9 is fixedly connected to the other side of the vacuum shell 13. A first valve is fixedly installed at one end of the three-way pipe 9. 8. A second valve 10 is fixedly installed on the other side of the three-way pipe 9, and a vacuum connection pipe 11 is fixedly installed on the inner wall of the second valve 10. By setting the first fixing plate 24 and the second fixing plate 7, and fixing them together with the reinforcing column 5, a stable frame structure is formed to support the entire device. The setting of the reinforcing column 5 enhances the stability of the structure and ensures that the device will not deform during the evacuation process. The vacuum shell 13 is installed between the first fixing plate 24 and the second fixing plate 7, and its bottom is connected to the rubber adsorption plate 6. The rubber adsorption plate 6 communicates with the inside of the vacuum shell 13 through the through hole 14. This connection method allows the rubber adsorption plate 6 to be tightly adsorbed on the bottom of the storage tank during evacuation, preventing outside air from entering the vacuum shell. 13. To ensure the accuracy of the detection, a gas pressure gauge 3 is installed on one side of the vacuum housing 13. One end of the three-way pipe 9 is connected to one side of the vacuum housing 13, and the other two ends are connected to the first valve 8 and the second valve 10, respectively. The first valve 8 is used to control the entry of outside air into the vacuum housing 13, and the second valve 10 is used to connect to the pumping equipment to extract gas from the vacuum housing 13. Through this connection method, the gas pressure inside the vacuum housing 13 can be easily controlled, and gas pressure changes can be monitored in real time. During the operation of the entire device, the close cooperation between the various structures is crucial. For example, when the pumping equipment is started, the second valve 10 opens, and gas is extracted from the vacuum housing 13 through the vacuum connection pipe 11. At this time, the rubber adsorption plate... 6. The gas pressure gauge 3 is tightly attached to the bottom of the storage tank to ensure a stable vacuum environment inside the vacuum shell 13. The gas pressure gauge 3 can provide timely feedback on the gas pressure inside the vacuum shell 13, providing a basis for judging whether the weld is sealed. After the test is completed, the first valve 8 is opened, and outside air enters the vacuum shell 13, so that the gas pressure inside and outside the vacuum shell 13 is balanced, which facilitates the disassembly and relocation of the device. In addition, the reasonable layout and connection method of these structures also take into account the maintenance and upkeep of the device. For example, the connection method between the components is easy to disassemble and install, and it is convenient to clean, inspect and repair the device. At the same time, some vulnerable parts, such as valves and connecting pipes, can also be easily replaced to ensure the long-term stable operation of the device.

[0018] Reference Figure 3 and Figure 4The other end of the connecting rod 202 is fixedly connected to the limiting plate 12. A tension spring 15 is movably sleeved on the surface of the connecting rod 202. The top of the tension spring 15 is fixedly connected to the bottom of the limiting plate 12, and the other end of the tension spring 15 is fixedly connected to the top of the support plate 20. By setting the tension spring 15, the tension spring 15 can provide an elastic tension for the connecting rod 202. When the electromagnet 201 is energized and magnetically attracted to the bottom of the tank, the tension of the tension spring 15 can ensure that the electromagnet 201 is tightly attached to the bottom of the tank, preventing the electromagnet 201 from loosening due to device shaking or minor external vibrations. At the same time, the limiting plate 12 is also crucial. It can not only limit the sliding range of the connecting rod 202 and prevent the connecting rod 202 from coming out of the sliding sleeve 204, ensuring the stability of the pre-fixing mechanism 2, but also, during the stretching and contraction of the tension spring 15, the limiting plate 12 can evenly distribute the tension of the tension spring 15, making the tension act more smoothly on the connecting rod 202. In actual operation... Workers can first place the device at a suitable position on the bottom weld of the storage tank, and then turn on the power to the electromagnet 201. The electromagnet 201 will generate magnetism and be attracted to the bottom of the tank. At this time, the tension spring 15 is in a stretched state, providing a downward pulling force to the electromagnet 201, ensuring that the device is initially fixed to the bottom of the tank. After that, the air extraction device is used to perform air extraction to create a certain degree of vacuum in the vacuum shell 13, so as to perform leak testing on the weld. During the air extraction process, due to the combined action of the tension of the tension spring 15 and the attraction force of the electromagnet 201, the device can be stably fixed to the bottom of the tank and will not be displaced due to airflow fluctuations or slight vibrations of the device itself, thus ensuring the accuracy and reliability of the leak test. If it is necessary to move the device to other weld positions during the test, simply turn off the power to the electromagnet 201. The electromagnet 201 will lose its magnetism, and the tension spring 15 will retract, driving the connecting rod 202 and the electromagnet 201 to reset, so that the device can be easily moved away. Reference Figure 3 and Figure 5A fixing post 22 is fixedly connected to the top of the adjusting plate 18. The surface of the fixing post 22 contacts the inner wall of the connecting plate 4. A knob 16 is threadedly connected to the inner wall of the fixing post 22. The bottom of the knob 16 is in close contact with the top of the connecting plate 4. By setting the knob 16, the relative position between the fixing post 22 and the connecting plate 4 can be easily adjusted. When it is necessary to adjust the height or angle of the adjusting plate 18, simply rotate the knob 16 to separate it from the connecting plate 4. At this time, the fixing post 22 can move freely on the inner wall of the connecting plate 4, thereby driving the adjusting plate 18 to adjust its position. After adjusting to the appropriate position, rotate the knob 16 in the opposite direction so that its bottom is in close contact with the top of the connecting plate 4. Use the friction of the threaded connection to fix the fixing post 22 in the current position, thereby fixing the adjusting plate 18. This adjustment method has the advantages of simple operation and reliable fixation. In actual use, the staff can flexibly adjust the position of the adjusting plate 18 according to the specific conditions of the tank bottom and the requirements of leak testing to ensure that the device can better adapt to different working scenarios. Reference Figure 3 and Figure 5 The connecting plate 4 has an adjustment groove 17 on its inner wall, the inner cavity of which contacts the surface of the adjusting plate 18. The top of the connecting plate 4 has a movable groove 19, the inner cavity of which contacts the surface of the fixed column 22. By providing the adjustment groove 17, precise guidance is provided for the movement of the adjusting plate 18, making its movement more stable and smooth. The inner wall of the adjustment groove 17 is finely polished, reducing friction with the surface of the adjusting plate 18 and minimizing potential jamming during adjustment, further improving the flexibility of adjustment. Simultaneously, the size of the adjustment groove 17 is compatible with the size of the adjusting plate 18. This ensures that the adjusting plate 18 can slide freely in the groove while avoiding shaking caused by excessive gaps, thus ensuring the overall stability of the device. When the adjusting plate 18 moves along the adjusting groove 17, it can accurately reach the preset position, meeting the high-precision requirements for device position adjustment in different working scenarios. By setting the movable groove 19, a stable space can be provided for the movement of the fixed column 22, making it less likely for the fixed column 22 to shift during movement. The inner wall of the movable groove 19 adopts a special anti-slip design, which can increase the friction with the surface of the fixed column 22, prevent the fixed column 22 from sliding freely in the groove, and ensure that it remains stable in a specific position. Reference Figure 4The inner wall of the support plate 20 is provided with mounting holes 23. The inner cavity of the mounting hole 23 is fixedly connected to the surface of the sliding sleeve 204. By setting the mounting hole 23, a stable mounting position can be provided for the sliding sleeve 204, ensuring the installation accuracy of the sliding sleeve 204 on the support plate 20. The inner diameter of the mounting hole 23 is precisely calculated and machined to perfectly match the outer diameter of the sliding sleeve 204, so that the sliding sleeve 204 can be tightly embedded in it without loosening or shaking. This tight fit not only enhances the overall stability of the device, but also effectively avoids the working errors that may be caused by the loosening of the sliding sleeve 204. After the sliding sleeve 204 is installed in the mounting hole 23, its surface is in full contact with the inner wall of the mounting hole 23, forming a good support structure. During the operation of the device... The sliding sleeve 204 can slide smoothly within the mounting hole 23, providing stable guidance for the movement of other components. At the same time, the inner wall of the mounting hole 23 has undergone special treatment and has low roughness, which can reduce the friction of the sliding sleeve 204 during the sliding process, improve the sliding efficiency and service life of the sliding sleeve 204. In addition, the opening position and size of the mounting hole 23 have also been carefully designed to ensure that the sliding sleeve 204 can accurately cooperate with other components during operation. Through reasonable layout, the sliding sleeve 204 can better transmit force and motion, making the operation of the entire device more coordinated and efficient. In different working scenarios, the sliding sleeve 204 can flexibly adjust its position within the mounting hole 23 according to actual needs, thereby meeting diverse working requirements. Reference Figure 5 The inner wall of the fixed column 22 is provided with a threaded hole 21. The inner cavity of the threaded hole 21 is threadedly connected to the surface of the knob 16. By setting the threaded connection between the threaded hole 21 and the knob 16, a stable connection between the fixed column 22 and the knob 16 can be achieved. When the knob 16 is rotated into the threaded hole 21, a certain axial force is generated, which tightly fixes the relevant components together and prevents them from shifting or loosening during the operation of the device. This threaded connection method has good self-locking performance and can ensure the stability of the connection state during long-term use. At the same time, by adjusting the depth of the knob 16 screwed into the threaded hole 21, some parameters of the device can be finely adjusted. For example, when it is necessary to adjust the pressure or gap of the device, the operator can change the relative position between the relevant components by rotating the knob 16, thereby achieving precise adjustment.

[0019] Working Principle: When performing leak testing on the weld seam at the bottom of a storage tank, the device is first initially fixed in a suitable position at the bottom of the tank using the pre-fixing mechanism 2. The electromagnet 201 is then powered on, generating magnetism that attracts it to the bottom of the tank. The tension spring 15 provides downward pulling force to ensure the device's stability. Afterward, based on the specific conditions of the tank bottom and the leak testing requirements, the height and angle of the adjusting plate 18 are adjusted using the knob 16 to better adapt the device to the working environment. During adjustment, rotating the knob 16 separates it from the connecting plate 4, allowing the fixing column 22 to move freely within the inner wall of the connecting plate 4, thus driving the adjustment... Plate 18 slides within adjustment groove 17. After adjusting to the appropriate position, knob 16 is rotated in the opposite direction to fix it. Next, the evacuation operation is performed. The second valve 10 is opened, and the vacuum connection pipe 11 is used to connect to an external evacuation device to begin evacuating air from the vacuum shell 13. As air is extracted, the pressure inside the vacuum shell 13 gradually decreases. The gas pressure gauge 3 displays the pressure change in real time. Because the rubber adsorption plate 6 is tightly attached to the bottom of the tank, and the vacuum shell 13 and the rubber adsorption plate 6 are connected through the through hole 14, the rubber adsorption plate 6 will adhere more tightly to the bottom of the tank under vacuum, further enhancing the sealing of the device. To ensure safety and stability, during the evacuation process, the tension of the spring 15 and the attraction force of the electromagnet 201 work together to ensure that the device will not shift due to airflow fluctuations or slight vibrations of the device itself. Once a certain vacuum level is reached inside the vacuum shell 13, the second valve 10 is closed, and the reading on the gas pressure gauge 3 is observed. If the reading remains stable for a period of time, it indicates a good weld seal. If the reading drops, it indicates a leak in the weld. In this case, the leak location can be marked for repair after the inspection is completed. After the inspection is finished, the first valve 8 is opened. This allows outside air to enter the vacuum chamber 13, making the air pressure inside the vacuum chamber 13 the same as the outside air pressure. Then, the power supply to the electromagnet 201 is disconnected, and the electromagnet 201 loses its magnetism. The tension spring 15 contracts, causing the connecting rod 202 and the electromagnet 201 to reset, allowing the device to be easily removed. Then, the device is cleaned and maintained, and each component is checked for damage or wear, such as the sliding sleeve 204, tension spring 15, and knob 16. If there are any problems, they should be replaced or repaired in time for future use. At the same time, the device should be stored properly to avoid collisions and damage, ensuring its performance and service life.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A vacuum device for leak testing of the bottom weld of a storage tank, comprising a vacuum machine (1), characterized in that: Two connecting plates (4) are fixedly connected to both sides of the vacuum machine (1). An adjusting plate (18) is provided on the inner wall of the connecting plate (4). A support plate (20) is fixedly connected to one side of the adjusting plate (18). A pre-fixing mechanism (2) is provided inside the support plate (20). The pre-fixing mechanism (2) includes a sliding sleeve (204), which is fixedly connected to the inside of the support plate (20). A connecting rod (202) is slidably connected to the inner wall of the sliding sleeve (204). An installation plate (203) is fixedly connected to one end of the connecting rod (202), and an electromagnet (201) is fixedly connected to the bottom of the installation plate (203).

2. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 1, characterized in that: The vacuum machine (1) includes a first fixed plate (24) and a second fixed plate (7). A reinforcing column (5) is fixedly connected to the bottom of the first fixed plate (24). There are four reinforcing columns (5). The connection between the first fixed plate (24) and the second fixed plate (7) is fixedly connected via the reinforcing columns (5). A vacuum shell (13) is fixedly connected between the inner walls of the first fixed plate (24) and the second fixed plate (7). A rubber adsorption plate (6) is fixedly connected to the bottom of the second fixed plate (7). 7) has a through hole (14) at the bottom. There are three through holes (14). The through holes (14) are used in conjunction with the rubber adsorption plate (6). A gas pressure gauge (3) is fixedly installed on one side of the vacuum shell (13). A three-way pipe (9) is fixedly connected to the other side of the vacuum shell (13). A first valve (8) is fixedly installed at one end of the three-way pipe (9). A second valve (10) is fixedly installed on the other side of the three-way pipe (9). A vacuum connecting pipe (11) is fixedly installed on the inner wall of the second valve (10).

3. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 1, characterized in that: The other end of the connecting rod (202) is fixedly connected to the limiting plate (12), and a tension spring (15) is movably sleeved on the surface of the connecting rod (202). The top of the tension spring (15) is fixedly connected to the bottom of the limiting plate (12), and the other end of the tension spring (15) is fixedly connected to the top of the support plate (20).

4. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 1, characterized in that: The top of the adjusting plate (18) is fixedly connected to a fixing post (22), the surface of the fixing post (22) is in contact with the inner wall of the connecting plate (4), and the inner wall of the fixing post (22) is threadedly connected to a knob (16), the bottom of the knob (16) is in close contact with the top of the connecting plate (4).

5. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 4, characterized in that: The inner wall of the connecting plate (4) is provided with an adjustment groove (17), the inner cavity of the adjustment groove (17) is in contact with the surface of the adjustment plate (18), and the top of the connecting plate (4) is provided with a movable groove (19), the inner cavity of the movable groove (19) is in contact with the surface of the fixed column (22).

6. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 1, characterized in that: The inner wall of the support plate (20) is provided with an installation hole (23), and the inner cavity of the installation hole (23) is fixedly connected to the surface of the sliding sleeve (204).

7. The vacuum device for leak testing of the bottom weld of a storage tank according to claim 4, characterized in that: The inner wall of the fixed column (22) is provided with a threaded hole (21), and the inner cavity of the threaded hole (21) is threadedly connected to the surface of the knob (16).

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