Pressure vessel leak detection device and leak detection method

Abstract

The invention discloses a pressure vessel leak detection device and leak detection method, the pressure vessel leak detection device comprises a base, a gas source device, a leak detection assembly, a marking assembly and a control device, and the base is provided with a leak detection station; the gas source device is arranged on the base so as to convey hot helium into the pressure container; the leak detection assembly is movably installed at the leak detection station and used for moving along the weld joint of the pressure vessel to detect the helium concentration at the weld joint, and the marking assembly is movably installed on the leak detection assembly and has a marking state close to the leak detection station and an avoiding state away from the leak detection station; the control device is electrically connected with the leak detection assembly and the marking assembly, obtains the helium concentration value at the weld joint and compares the helium concentration value with a set value, and when the helium concentration value is larger than the set value, the marking assembly is driven to be in a marking state so as to mark the position. The pressure container leak detection device can perform leak detection on a pressure container and can mark a leak point, so that an operator can quickly position the leak point, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot helium leak detection equipment, and in particular to a pressure vessel leak detection device and a leak detection method. Background Art

[0002] Hot helium leak detection devices for pressure vessels are usually used to detect possible leaks in pressure vessels or piping systems. Hot helium leak detection devices use hot helium gas as the detection medium. By heating the helium gas and introducing it into the system being detected, the characteristics of helium are used to detect leaks. During the test, the device will first heat the helium to a certain temperature, and then introduce the heated helium into the pressure vessel through a nozzle or pipe. If there is a leak in the system, the helium will enter the surrounding environment from the leak point. The detection device uses a helium detector to detect changes in the helium concentration in the surrounding air to determine the location and size of the leak. Hot helium leak detection devices for pressure vessels are a type of leak detection equipment commonly used in the industrial field that can help ensure the safety and reliability of pressure equipment.

[0003] Patent CN118424584A discloses a pressure vessel hot helium leak detection device and a leak detection method thereof, comprising a bracket, an electrical box, a helium box, a detector, a box body, an alarm and a fixing mechanism; the electrical box is installed on the upper side of the bracket, the helium box is installed on the side of the electrical box, a detector is installed on the upper side of the electrical box, the box body is installed above the detector, the alarm is installed above the box body, and the fixing mechanism is installed below the detector; the fixing assembly in the fixing mechanism is driven by the cylinder in the driving assembly and is limited by the sliding groove and the limiting groove, so that multiple support blocks clamp the pressure vessel in the direction of the ventilation block, and finally the inside of the pressure vessel is quickly tested for hot helium leaks through the ventilation block.

[0004] However, although the above-mentioned prior art can perform overall leak detection on the pressure vessel, it is unable to locate the specific leak point. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a pressure vessel leak detection device to solve the technical problem that the specific leakage point cannot be located in the prior art.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a pressure vessel leak detection device, comprising: A base, provided with a leak detection station for placing the pressure vessel; A gas source device, disposed on the base, and used for delivering hot helium into the pressure vessel; A leak detection assembly, movably mounted on the leak detection station, and used to move along the weld of the pressure vessel to detect the helium concentration at the weld; a marking assembly movably mounted on the leak detection assembly to have a marking state close to the leak detection station and a avoiding state far away from the leak detection station; and A control device is electrically connected to the leak detection component and the marking component. The control device obtains the helium concentration value at the weld and compares it with a set value. When the helium concentration value is greater than the set value, the marking component is driven to be in the marking state to mark the location.

[0007] In some embodiments, the leak detection assembly includes a vertical moving assembly, a horizontal rotating assembly and a leak detector. The vertical moving assembly is movably installed above the leak detection station in a vertical direction, the horizontal rotating assembly is rotatably installed around the leak detection station on the vertical moving assembly, and the leak detector is arranged on the horizontal rotating assembly. The leak detector is used to detect the helium concentration at the weld of the pressure vessel.

[0008] In some embodiments, the vertical moving assembly includes a first mounting ring and a first driving mechanism. The first mounting ring is movably mounted on the base along the vertical direction and is located above the leak detection station. The first driving mechanism is disposed on the base and connected to the first mounting ring to drive the first mounting ring to move.

[0009] In some embodiments, the horizontal rotation assembly includes a second mounting ring and a second driving mechanism, the second mounting ring is adapted to the first mounting ring, the second mounting ring is rotatably mounted on the first mounting ring along an axis in the vertical direction, and the second driving mechanism is connected to the second mounting ring to drive the second mounting ring to rotate, wherein the leak detector and the marking assembly are both mounted on the second mounting ring.

[0010] In some embodiments, the first mounting ring is provided with a first notch, and the second mounting ring is provided with a second notch, so that when the second mounting ring is rotated until the second notch corresponds to the first notch, the second notch and the first notch form an avoidance channel, and the avoidance channel is used to avoid the pipeline of the air source device.

[0011] In some embodiments, a gear ring is provided on the outer periphery of the second mounting ring; The second driving mechanism includes two gears, a synchronization component and a driving motor. The two gears are arranged at opposite ends of the first mounting ring. Each gear is arranged to rotate along an axis in the vertical direction. The gear is meshed with the ring gear. The synchronization component connects the two gears so that the two gears rotate synchronously. The driving motor is connected to one of the gears to drive the gear to rotate.

[0012] In some embodiments, the marking assembly includes a marking pen and a third driving mechanism. The marking pen is movably mounted on the second mounting ring along a direction approaching and moving away from the leak detection station. The third driving mechanism is mounted on the second mounting ring and connected to the marking pen to drive the marking pen to move.

[0013] In some embodiments, the leak detector is movably arranged in a direction approaching and moving away from the leak detection station.

[0014] In some embodiments, the pressure vessel leak detection device further includes a positioning assembly, which is movably disposed on the base and is located beside the leak detection station, and is used to position the pressure vessel so that the pressure vessel is located in the exact center of the leak detection station.

[0015] In addition, the present invention also provides a leak detection method, comprising the following steps: S1: Before leak detection, the operator should conduct an appearance inspection of the pressure vessel to ensure that there is no damage or leakage. The inside of the equipment and the surface of the weld should be thoroughly cleaned to ensure that there is no oil stain, welding slag, water accumulation, dirt, etc. inside the equipment to avoid affecting the test results. The pressure vessel should be emptied and ensured to be in a safe state without any internal pressure. S2: The operator places the pressure vessel on the leak detection station, and the positioning assembly positions the pressure vessel so that the pressure vessel is located in the center of the leak detection station; S3: connecting the gas source assembly to the pressure vessel, and delivering hot helium to the pressure vessel through the gas source assembly; S4: Detecting the helium concentration at the weld of the pressure vessel through a leak detection assembly; S5: When the helium concentration value at a certain weld is greater than the set value, the marking component is controlled to move toward the pressure vessel to mark the weld.

[0016] Compared with the prior art, the pressure vessel leak detection device provided by the present invention has a leak detection assembly capable of leak detection on the vertical welds and circumferential welds of the pressure vessel. When used, the pressure vessel is placed on a leak detection station, and the gas source device is connected to the pressure vessel, and hot helium is transported into the pressure vessel through the gas source device. Then, the leak detection device is started, and the leak detection device moves in a vertical direction until it is at the same horizontal plane as the circumferential welds of the pressure vessel. At this time, the leak detection device is facing the circumferential welds of the pressure vessel, and then the leak detection device moves around the pressure vessel. It rotates circumferentially, so that the entire circumferential weld can be leak-checked. After the circumferential weld leak check is completed, the leak detection device is then aimed at the vertical weld of the pressure vessel, and the leak detection device moves in the vertical direction to leak-check the vertical weld. When the helium concentration value at a certain weld is greater than the set value, it means that there is a leak here. The marking component moves toward the direction of the pressure vessel and marks this place. The present application can not only leak-check the pressure vessel, but also mark the leakage point, which is beneficial for the operator to quickly locate the leakage point and improve the work efficiency.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a pressure vessel leak detection device provided by the present invention; Figure 2 yes Figure 1 The front view of the medium pressure vessel leak detection device; Figure 3 yes Figure 1 A top view of the leak detection device for a medium pressure vessel; Figure 4 yes Figure 1 A three-dimensional schematic diagram of the second mounting ring; Figure 5 yes Figure 1 A partial schematic diagram of the second mounting ring; Figure 6 yes Figure 1 A top sectional view of a pressure vessel leak detection device.

[0019] Description of reference numerals: 1-base, 11-leak detection station, 2-leak detection assembly, 21-first mounting ring, 211-first notch, 22-second mounting ring, 221-second notch, 222-gear ring, 23-gear, 24-synchronizing assembly, 25-driving motor, 26-second electric telescopic rod, 27-leak detector, 3-marking assembly, 31-marking pen, 32-third driving mechanism, 4-positioning assembly, 41-V-block, 42-screw, 43-second motor, 5-visual detection device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to solve the technical problem that the specific leakage point cannot be located in the prior art, the present invention provides a pressure vessel leak detection device, which can detect leaks in pressure vessels and mark leakage points, thereby facilitating operators to quickly locate leakage points and improving work efficiency.

[0022] See also Figure 1 , Figure 1 It is a schematic structural diagram of a pressure vessel leak detection device in one embodiment of the present invention.

[0023] The present invention provides a pressure vessel leak detection device, comprising a base 1, an air source device, a leak detection component 2, a marking component 3 and a control device, wherein the base 1 is provided with a leak detection station 11 for placing the pressure vessel; the air source device is arranged on the base 1, and the air source device is used to transport hot helium into the pressure vessel; the leak detection component 2 is movably installed on the leak detection station 11, and the leak detection component 2 is used to move along a weld of the pressure vessel to detect the helium concentration at the weld; the marking component 3 is movably installed on the leak detection component 2 to have a marking state close to the leak detection station 11 and a avoiding state away from the leak detection station 11; the control device is electrically connected to the leak detection component 2 and the marking component 3, and the control device obtains the helium concentration value at the weld and compares it with a set value, and when the helium concentration value is greater than the set value, drives the marking component 3 to be in the marking state to mark the place.

[0024] In this embodiment, the leak detection assembly 2 can detect leaks on the vertical welds and circumferential welds of the pressure vessel. When used specifically, the pressure vessel is placed on the leak detection station, and the gas source device is connected to the pressure vessel, and hot helium is transported into the pressure vessel through the gas source device. Then the leak detection device is started, and the leak detection device moves in the vertical direction until it is at the same horizontal plane as the circumferential welds of the pressure vessel. At this time, the leak detection device is facing the circumferential welds of the pressure vessel, and then the leak detection device rotates around the circumference of the pressure vessel, so that the entire circumferential weld can be leaked. After the leak detection of the circumferential weld is completed, the leak detection device is aligned with the vertical weld of the pressure vessel, and the leak detection device moves in the vertical direction to detect leaks on the vertical weld. When the helium concentration value at a certain weld is greater than the set value, it indicates that there is a leak here. The marking assembly 3 moves toward the direction of the pressure vessel and marks this place. The present application can not only detect leaks on the pressure vessel, but also mark the leakage point, which is beneficial for the operator to quickly locate the leakage point and improve work efficiency.

[0025] In this embodiment, the pressure vessel is illustrated by taking a certain gas storage tank as an example. The gas storage tank is provided with horizontal annular welds at the upper and lower ends, and a vertical linear weld is provided in the middle of the gas storage tank. The linear weld extends to the annular weld. The two annular welds and the vertical weld are the positions required to be inspected in this application.

[0026] In one embodiment, see Figures 1 to 3 The leak detection assembly 2 includes a vertical moving assembly, a horizontal rotating assembly and a leak detector 27. The vertical moving assembly is movably installed above the leak detection station 11 in the vertical direction. The horizontal rotating assembly is rotatably installed around the leak detection station 11 on the vertical moving assembly. The leak detector 27 is arranged on the horizontal rotating assembly. The leak detector 27 is used to detect the helium concentration at the weld of the pressure vessel.

[0027] In this embodiment, the vertical moving component is movably installed on the base 1 in the vertical direction, and can drive the horizontal rotating component and the leak detector 27 to move in the vertical direction, so as to adjust the position of the leak detector 27 in the vertical direction. Such a configuration is convenient for moving the leak detector 27 to the weld on the one hand, and enables the device to adapt to pressure vessels of different heights and sizes on the other hand, thereby expanding the scope of application of the device. The horizontal rotating component is installed on the vertical moving component, and the horizontal rotating component can drive the leak detector 27 to rotate around the pressure vessel, so as to detect leaks on the circumference of the pressure vessel, which is conducive to locating the leakage point.

[0028] It should be noted that the leak detector 27 is a helium detector, which is a prior art and will not be described in detail here.

[0029] In one embodiment, see Figures 1 to 3 The vertical moving assembly includes a first mounting ring 21 and a first driving mechanism. The first mounting ring 21 is movably mounted on the base 1 along the vertical direction and is located above the leak detection station 11. The first driving mechanism is disposed on the base 1 and connected to the first mounting ring 21 to drive the first mounting ring 21 to move.

[0030] In this embodiment, two vertical frames are provided on the upper side of the base 1, and the two vertical frames are located on opposite sides of the leak detection station. The two ends of the first mounting ring 21 are slidably installed on the two vertical frames along the vertical direction. The hollow area of ​​the first mounting ring 21 faces the leak detection station, so that the first mounting ring 21 is sleeved on the outer periphery of the pressure vessel. The first driving mechanism is provided on one of the vertical frames, and the first driving mechanism is connected to the first mounting ring 21, thereby driving the first mounting ring 21 to move in the vertical direction.

[0031] In this embodiment, the first mounting ring 21 is provided with a threaded hole; the first driving mechanism includes a screw rod and a first motor, the screw rod is rotatably installed along an axis in the vertical direction in one of the vertical frames, the screw rod is threadedly matched with the threaded hole, and the main shaft of the first motor is connected to one end of the screw rod, thereby driving the screw rod to rotate.

[0032] In one embodiment, see Figures 2 to 5 The horizontal rotation assembly includes a second mounting ring 22 and a second driving mechanism. The second mounting ring 22 is adapted to the first mounting ring 21. The second mounting ring 22 is rotatably mounted on the first mounting ring 21 along an axis in the vertical direction. The second driving mechanism is connected to the second mounting ring 22 to drive the second mounting ring 22 to rotate, wherein the leak detector 27 and the marking assembly 3 are both mounted on the second mounting ring 22.

[0033] In this embodiment, the inner diameter of the second mounting ring 22 is slightly larger than the inner diameter of the first mounting ring 21, and the outer diameter of the second mounting ring 22 is slightly smaller than the outer diameter of the first mounting ring 21. The lower side of the first mounting ring 21 is provided with a T-shaped groove arranged in an annular shape, and the second mounting ring 22 is rotatably installed in the T-shaped groove, and the leak detector 27 and the marking assembly 3 are both installed on the second mounting ring 22, and the second driving assembly is arranged on the first mounting ring 21, and the second driving assembly is connected to the second mounting ring 22, so as to drive the second mounting ring 22 to rotate, thereby driving the leak detector 27 and the marking assembly 3 to rotate around the pressure vessel.

[0034] In one embodiment, see Figure 3 to Figure 4The first mounting ring 21 is provided with a first notch 211, and the second mounting ring 22 is provided with a second notch 221, so that when the second mounting ring 22 is rotated to the point where the second notch 221 corresponds to the first notch 211, the second notch 221 and the first notch 211 form an avoidance channel, and the avoidance channel is used to avoid the pipeline of the gas source device.

[0035] In this embodiment, the air inlet and outlet of the pressure vessel are generally arranged at the end or side of the pressure vessel. During specific inspection, one of the ports is connected to the air source device through a pipeline, and the remaining ports are blocked. Since the first mounting ring 21 and the second mounting ring 22 are both mounted on the outer circumference of the pressure vessel, in order to avoid interference of the pipeline with the movement of the first mounting ring 21 and the second mounting ring 22, a first notch 211 connecting the central area thereof is provided on the first mounting ring 21, and a second notch 221 connecting the central area thereof is provided on the second mounting ring 22. The widths of the first notch 211 and the second notch 221 are consistent. When the first notch 211 and the second notch 221 correspond to each other, an avoidance channel can be formed for avoiding the pipeline to avoid interference with the first mounting ring 21 and the second mounting ring 22.

[0036] In one embodiment, see Figures 4 to 5 , a gear ring 222 is provided on the outer periphery of the second mounting ring 22; the second driving mechanism includes two gears 23, a synchronization component 24 and a driving motor 25, the two gears 23 are provided at opposite ends of the first mounting ring 21, each of the gears 23 is rotatably arranged along an axis in the vertical direction, the gears 23 are meshed with the gear ring 222, the synchronization component 24 connects the two gears 23 so that the two gears 23 rotate synchronously, and the driving motor 25 is connected to one of the gears 23 to drive the gear 23 to rotate.

[0037] In this embodiment, since a notch is provided on the second mounting ring 22, in order to be able to drive the second ring to rotate, a plurality of teeth are provided on the outer circumference of the second mounting ring 22 except for the notch, and the plurality of teeth constitute the gear ring 222. The two gears 23 are located at opposite ends of the first mounting ring 21. The gears 23 are rotatably installed on the lower side of the first mounting ring 21, and the gears 23 are meshed with the gear ring 222. The synchronization assembly 24 connects the two gears 23, thereby ensuring that the two gears 23 rotate synchronously. With this arrangement, even if the second mounting ring 22 rotates to one of the gears 23 corresponding to the second notch 221, the other gear 23 can also ensure meshing with the gear ring 222, thereby ensuring the rotation of the second mounting ring 22.

[0038] Specifically, the synchronous assembly 24 includes two synchronous pulleys, a synchronous belt and a plurality of guide members. The two synchronous pulleys correspond to the two gears 23 one by one. The synchronous pulleys are coaxially fixed to the corresponding gears 23. The synchronous belts are respectively connected to the two synchronous pulleys. The plurality of guide members are arranged at intervals along the circumference of the first mounting ring 21 and are arranged in an arc shape as a whole. The synchronous belt is wound around the plurality of guide members, so that the synchronous belt avoids the hollow area of ​​the second mounting ring 22.

[0039] In one embodiment, see Figure 5 The marking assembly 3 includes a marking pen 31 and a third driving mechanism 32. The marking pen 31 is movably mounted on the second mounting ring 22 along a direction approaching and moving away from the leak detection station 11. The third driving mechanism 32 is mounted on the second mounting ring 22 and connected to the marking pen 31 to drive the marking pen 31 to move.

[0040] In this embodiment, the third driving mechanism 32 is a first electric telescopic rod, which is installed on the lower side of the second mounting ring 22. The marking pen 31 is installed on the end of the first electric telescopic rod and is arranged toward the leak detection station. The leak detector and the first electric telescopic rod are arranged side by side, that is, the leak detector 27 and the marking pen 31 are close to each other. When the leak detector 27 detects a leak somewhere, the first electric telescopic rod drives the marking pen 31 to move toward the pressure vessel, so that the marking pen 31 contacts the pressure vessel, thereby forming a mark on the pressure vessel, which is convenient for the operator to quickly locate the leak point.

[0041] In one embodiment, see Figure 5 The leak detector 27 is movably arranged in a direction close to and away from the leak detection station 11.

[0042] In this embodiment, the inner diameter of the first mounting ring 21 is relatively large, so that it can be adapted to pressure vessels of different diameters. In order to be able to detect pressure vessels of different diameters, the leak detection assembly 2 also includes a second electric telescopic rod 26, which is installed on the second mounting ring 22 and arranged side by side with the first electric telescopic rod. The leak detector 27 is installed on the end of the second electric telescopic rod 26, so that the leak detector 27 is driven by the second electric telescopic rod to move in the radial direction of the second mounting ring 22, thereby adjusting the distance between the leak detector 27 and the center of the leak detection station. During specific use, the position of the leak detector 27 can be adjusted according to the diameter of the pressure vessel, so that the leak detector 27 is always close to the side of the pressure vessel, thereby improving the detection accuracy.

[0043] In one embodiment, see Figure 6 The pressure vessel leak detection device also includes a positioning component 4, which is movably arranged on the base 1 and is located beside the leak detection station 11. The positioning component 4 is used to position the pressure vessel so that the pressure vessel is located in the center of the leak detection station 11.

[0044] In this embodiment, in order to ensure that the pressure vessel is located at the center of the leak detection station, a positioning device is also provided on the base 1 , and the positioning device can position the pressure vessel so that the pressure vessel is located in the center of the leak detection station 11 .

[0045] Specifically, the positioning assembly 4 includes two V-blocks 41 and a fourth driving mechanism, the two V-blocks 41 are located on opposite sides of the leak detection station 11 and are arranged toward the leak detection station, the two V-blocks 41 are movable in directions of approaching and moving away from each other, and the fourth driving mechanism is connected to the two V-blocks 41 to drive the two V-blocks 41 to move synchronously through the fourth driving mechanism. Since the two V-blocks 41 are arranged in the center, the pressure vessel is clamped by two V-blocks 41 close to each other, so that the pressure vessel can be positioned to ensure that the pressure vessel is in the center of the leak detection station 11.

[0046] Specifically, the V-block 41 is provided with a threaded hole; the fourth driving mechanism includes a lead screw 42 and a second motor 43, the lead screw 42 is rotatably installed on the base 1 along an axis in the horizontal direction, the lead screw includes a first thread segment and a second thread segment connected in sequence, wherein the threads of the first thread segment and the second thread segment are arranged oppositely, the first thread segment is threadedly connected to one of the V-blocks 41, and the second thread segment is threadedly connected to the other V-block 41, and the main shaft of the second motor 43 is connected to one end of the lead screw 42, so that the lead screw 42 is driven to rotate by the second motor 43, thereby ensuring that the two V-blocks 41 can approach and move away synchronously.

[0047] In this embodiment, the pressure vessel leak detection device further includes a visual detection device 5, which is disposed on the second mounting ring 22 and close to the leak detector. The visual detection device 5 is used to detect the position of the weld.

[0048] Specifically, the control device is electrically connected to the gas source device and is used to control the opening and closing of the gas source device. The control device is electrically connected to the leak detector 27 and the third drive mechanism 32. The control device is used to obtain the information detected by the leak detector 27, and when the helium concentration value at a certain weld is greater than the set value, the third drive mechanism 32 is controlled to move toward the pressure vessel to mark the weld. The control device is electrically connected to the visual inspection device 5, the first drive mechanism and the second drive mechanism to control the activities of the first drive mechanism and the second drive mechanism according to the visual inspection device 5, so as to accurately locate the weld position of the pressure vessel and avoid the pipeline. The control device is also electrically connected to the fourth drive mechanism to control the operation of the fourth drive mechanism.

[0049] In addition, the present invention also provides a leak detection method, comprising the following steps: S1: Before leak detection, the operator should conduct an appearance inspection of the pressure vessel to ensure that there is no damage or leakage. The inside of the equipment and the surface of the weld should be thoroughly cleaned to ensure that there is no oil stain, welding slag, water accumulation, dirt, etc. inside the equipment to avoid affecting the test results. The pressure vessel should be emptied and ensured to be in a safe state without any internal pressure. S2: The operator places the pressure vessel on the leak detection station 11, and the positioning assembly 4 positions the pressure vessel so that the pressure vessel is located in the center of the leak detection station 11; S3: connecting the gas source assembly to the pressure vessel, and delivering hot helium to the pressure vessel through the gas source assembly; S4: Detecting the helium concentration at the weld of the pressure vessel through the leak detection assembly 2; S5: When the helium concentration value at a certain weld is greater than the set value, the marking component 3 is controlled to move toward the pressure vessel to mark the weld.

[0050] In order to better understand the present invention, the following Figures 1 to 6 The technical solution of the present invention is described in detail: During specific use, first, before performing the leak detection operation, the operator performs an appearance inspection of the pressure vessel to ensure that it has no damage or leakage. The interior of the equipment and the surface of the weld should be thoroughly cleaned to ensure that there is no oil stain, welding slag, and accumulated water and dirt inside the equipment to avoid affecting the detection results. The pressure vessel should be emptied and ensured to be in a safe state without any internal pressure. The pressure vessel is then placed in the leak detection station and the second motor 43 is started. The second motor 43 drives the lead screw 42 to rotate so that the two V-blocks 41 approach each other and abut against the pressure vessel, thereby pushing the pressure vessel to the center of the leak detection station. After the pressure vessel moves to the center of the leak detection station, the second motor 43 rotates in the opposite direction so that the two V-blocks 41 move away from each other and break contact with the pressure vessel to avoid interference with the leak detection. The gas source device is connected to the pressure vessel and helium is delivered. The pressure vessel is then scanned by the visual inspection device 5 to obtain the position of the weld and to proceed. The position of the gas outlet, the first driving mechanism drives the first mounting ring 21 to move, so that the leak detector 27 is at the uppermost annular weld, and then the leak detector 27 and the second driving mechanism are started, the second driving mechanism drives the second mounting ring 22 and the leak detector to rotate, and the annular weld is detected. When the helium concentration value at a certain weld is greater than the set value, it indicates that there is a leak here, the third driving mechanism 32 drives the marking pen 31 to move toward the pressure vessel and marks this place, and then continues to drive the second mounting ring 22 to rotate until the full circle detection is completed, and then the second driving mechanism drives the second mounting ring 22 to align the leak detector 27 with the vertical weld, and then the first driving mechanism drives the first mounting ring 21 to move downward, so as to detect the vertical weld, and the detection method of the annular weld below is consistent with that of the upper one, so that the entire pressure vessel can be detected, which is beneficial for the operator to quickly locate the leakage point and improve the work efficiency.

[0051] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pressure vessel leak detection device, characterized in that: include: A base, provided with a leak detection station for placing the pressure vessel; A gas source device, disposed on the base, and used for delivering hot helium into the pressure vessel; A leak detection assembly, movably mounted on the leak detection station, and used to move along the weld of the pressure vessel to detect the helium concentration at the weld; A marking component, movably mounted on the leak detection component, so as to have a marking state close to the leak detection station and a avoiding state far away from the leak detection station; and A control device is electrically connected to the leak detection component and the marking component. The control device obtains the helium concentration value at the weld and compares it with a set value. When the helium concentration value is greater than the set value, the marking component is driven to be in the marking state to mark the location.

2. The pressure vessel leak detection device according to claim 1, characterized in that: The leak detection assembly includes a vertical moving assembly, a horizontal rotating assembly and a leak detector. The vertical moving assembly is movably installed above the leak detection station in the vertical direction, the horizontal rotating assembly is rotatably installed around the leak detection station on the vertical moving assembly, and the leak detector is arranged on the horizontal rotating assembly. The leak detector is used to detect the helium concentration at the weld of the pressure vessel.

3. The pressure vessel leak detection device according to claim 2, characterized in that: The vertical moving assembly includes a first mounting ring and a first driving mechanism. The first mounting ring is movably mounted on the base along the vertical direction and is located above the leak detection station. The first driving mechanism is arranged on the base and connected to the first mounting ring to drive the first mounting ring to move.

4. The pressure vessel leak detection device according to claim 3, characterized in that: The horizontal rotation assembly includes a second mounting ring and a second driving mechanism, the second mounting ring is adapted to the first mounting ring, the second mounting ring is rotatably mounted on the first mounting ring along an axis in the vertical direction, and the second driving mechanism is connected to the second mounting ring to drive the second mounting ring to rotate, wherein the leak detector and the marking assembly are both mounted on the second mounting ring.

5. The pressure vessel leak detection device according to claim 4, characterized in that: The first mounting ring is provided with a first notch, and the second mounting ring is provided with a second notch, so that when the second mounting ring is rotated until the second notch corresponds to the first notch, the second notch and the first notch form an avoidance channel, and the avoidance channel is used to avoid the pipeline of the air source device.

6. The pressure vessel leak detection device according to claim 5, characterized in that: The outer periphery of the second mounting ring is provided with a gear ring; The second driving mechanism includes two gears, a synchronization component and a driving motor. The two gears are arranged at opposite ends of the first mounting ring. Each gear is arranged to rotate along an axis in the vertical direction. The gear is meshed with the ring gear. The synchronization component connects the two gears so that the two gears rotate synchronously. The driving motor is connected to one of the gears to drive the gear to rotate.

7. The pressure vessel leak detection device according to claim 4, characterized in that: The marking assembly includes a marking pen and a third driving mechanism. The marking pen is movably mounted on the second mounting ring along a direction approaching and moving away from the leak detection station. The third driving mechanism is mounted on the second mounting ring and connected to the marking pen to drive the marking pen to move.

8. The pressure vessel leak detection device according to claim 2, characterized in that: The leak detector is movably arranged along a direction approaching and moving away from the leak detection station.

9. The pressure vessel leak detection device according to claim 1, characterized in that: The pressure vessel leak detection device also includes a positioning component, which is movably arranged on the base and is located beside the leak detection station. The positioning component is used to position the pressure vessel so that the pressure vessel is located in the center of the leak detection station.

10. A leak detection method, characterized in that: The following steps are involved: S1: Before leak detection, the operator should conduct an appearance inspection of the pressure vessel to ensure that there is no damage or leakage. The inside of the equipment and the surface of the weld should be thoroughly cleaned to ensure that there is no oil stain, welding slag, water accumulation or dirt inside the equipment to avoid affecting the test results. The pressure vessel should be emptied and ensured to be in a safe state without any internal pressure. S2: The operator places the pressure vessel on the leak detection station, and the positioning assembly positions the pressure vessel so that the pressure vessel is located in the center of the leak detection station; S3: connecting the gas source assembly to the pressure vessel, and delivering hot helium to the pressure vessel through the gas source assembly; S4: Detecting the helium concentration at the weld of the pressure vessel through the leak detection assembly; S5: When the helium concentration value at a certain weld is greater than the set value, the marking component is controlled to move toward the pressure vessel to mark the weld.

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