Weld joint leak detection device

Abstract

The utility model belongs to the technical field of nuclear power overhaul, and particularly relates to a weld joint leak detection device, which comprises a loading vehicle, a vacuum cover, a vacuum pump, a sprayer and a controller, the vacuum cover is movably mounted on a support of the loading vehicle, the support is provided with a first driving part, the first driving part is connected with the vacuum cover to drive the vacuum cover to move, and the controller is connected with the vacuum cover. The sprayer sprays detection liquid to the to-be-detected welding seam when the vacuum cover covers the target welding seam, and the controller is in communication connection with the loading vehicle, the first driving piece and the vacuum pump. During weld joint inspection, when leakage occurs at a target weld joint covered by the vacuum cover, external gas enters the vacuum cover from a leakage point under the action of pressure due to the fact that pressure difference exists inside and outside the vacuum cover, so that whether leakage exists or not can be judged by generating bubbles at the leakage point, and therefore, the vacuum cover and the sprayer are carried by the loading vehicle to move, and compared with manual detection, the detection efficiency is greatly improved. And the detection is safer and the efficiency is higher.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power maintenance, and more particularly relates to a welding seam leak detection device. BACKGROUND

[0002] In a nuclear power plant, a refueling water tank is a very important facility, which is used to provide boron-containing water for a reactor pool during refueling of the nuclear reactor, so as to ensure that the reactor is in a sufficient subcritical state, thereby ensuring the safe performance of the refueling operation. Since the refueling water tank of the nuclear power plant is near the nuclear reactor, defects exist in the bottom plate welding seam, which may cause boron-containing water to leak. The boron-containing water is radioactive, and once it leaks, it will cause serious radiation hazards to the environment and personnel. Therefore, it is necessary to detect the bottom plate welding seam of the refueling water tank to find potential leakage points in time, so as to take effective repair measures and thereby avoid leakage of radioactive substances.

[0003] In the related art, when the sealing of the bottom plate of the refueling water tank is checked, the manhole of the refueling water tank needs to be opened, and the nondestructive testing personnel who have done a good job of radiation protection enter the inside of the water tank from the manhole to carry out leak detection work. However, the inspection personnel are directly exposed to the radiation environment during the inspection, and there may be certain radioactive substances in the water tank and its surrounding area. Long-time manual inspection will cause the inspection personnel to accumulate radiation dose, which may cause damage to their health. In order to reduce the radiation hazards, the inspection personnel need to wear heavy protective equipment such as lead clothes, which will seriously affect the flexibility and operational convenience of the inspection personnel, resulting in reduced detection efficiency and quality. In addition, manual inspection depends on the experience and skill level of the inspection personnel, and different inspection personnel may have different judgment standards for welding seam defects. Some small cracks may be misjudged, which may cause safety accidents. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiments of the present application is to provide a welding seam leak detection device to solve the technical problem in the prior art that manual detection of the bottom plate welding seam of the refueling water tank causes nuclear radiation damage to the health of the inspection personnel and the detection quality and efficiency are low.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0006] A welding seam leak detection device is provided, comprising:

[0007] A loading vehicle is provided with a support, and the loading vehicle can move along the target welding seam to be detected;

[0008] A vacuum cover is movably installed on the support, and the vacuum cover is provided with a first opening. The support is provided with a first driving member, and the first driving member is drivingly connected with the vacuum cover, so that the vacuum cover can be moved to cover at least part of the target welding seam;

[0009] a vacuum pump mounted on the bracket, the vacuum pump being connected to the vacuum cover for evacuating the area covered by the vacuum cover when the vacuum cover covers at least part of the target weld;

[0010] a sprayer mounted on the bracket, the sprayer being used for spraying the target weld with a leak detection liquid before the vacuum cover covers the target weld; and

[0011] a controller in communication connection with the loading vehicle, the first driving member, the vacuum pump and the sprayer.

[0012] In some embodiments, the loading vehicle is further provided with a bearing plate, the bracket is mounted on the bearing plate, the bearing plate is provided with a second opening corresponding to the position of the vacuum cover, the size of the second opening is larger than the size of the vacuum cover, so that the vacuum cover can pass out of the second opening and cover the target weld.

[0013] In some embodiments, the bracket comprises at least one support rod perpendicular to the plane where the second opening is located, the vacuum cover is in sliding connection with the support rod, and the first driving member drives the vacuum cover to move up and down along the support rod relative to the second opening.

[0014] In some embodiments, the bracket comprises a plurality of support rods arranged at intervals, the plurality of support rods are arranged around the vacuum cover, and the vacuum cover is in one-to-one corresponding connection with the plurality of support rods at a plurality of circumferential positions.

[0015] In some embodiments, one of the support rod and the vacuum cover is provided with a sliding groove, the other one of the vacuum cover and the support rod is provided with a sliding rail adapted to be clamped with the sliding groove, the sliding groove is perpendicular to the plane where the second opening is located, and the output end of the first driving member is connected with the vacuum cover.

[0016] In some embodiments, the first driving member comprises a plurality of self-rotating nuts, the support rods are screw rods, and each support rod is in screw connection with a self-rotating nut at the position where the vacuum cover is connected with the support rod. The self-rotating nut rotates to drive the vacuum cover to move up and down along the support rod.

[0017] In some embodiments, the position where the vacuum cover is connected with each support rod is further provided with a self-locking ring, the self-locking ring is sleeved on the corresponding support rod, and on the same support rod, the self-locking ring is located below the self-rotating nut.

[0018] In some embodiments, the edge portion of the first opening is provided with an annular sealing ring.

[0019] In some embodiments, the weld leak detection device further comprises a monitoring device in communication connection with the controller, the monitoring device is movably mounted on the bracket, at least part of the vacuum cover is provided with a transparent window, and the monitoring device can obtain image information in the vacuum cover from the transparent window.

[0020] In some embodiments, the vacuum cover further comprises a second driving member in communication with the controller, and a scale is connected to the driving end of the second driving member, and the scale is used to measure the size of the bubbles generated at the position of the target weld covered by the vacuum cover.

[0021] The welding seam leak detection device provided by the present application has the beneficial effects that the loading vehicle loads the vacuum cover, the vacuum pump and the sprayer, the vacuum cover is movably installed on the support of the loading vehicle, the support is provided with the first driving member, the first driving member is connected with the vacuum cover to drive the movement of the vacuum cover, the sprayer is used to spray the detection liquid to the welding seam to be detected, and the controller is in communication with the loading vehicle, the first driving member and the vacuum pump. When the welding seam is checked, for example, when the bottom plate welding seam of the refueling water tank of the nuclear power plant is checked, the loading vehicle is moved to the position where the bottom plate is close to the welding seam, the loading vehicle is started, the controller controls the movement of the loading vehicle to the position near the target welding seam, so that the first opening of the vacuum cover is aligned with part or all of the target welding seam, then the controller controls the sprayer to spray the detection liquid to the target welding seam, so that the detection liquid covers the target welding seam, after the spraying is completed, the first driving member drives the movement of the vacuum cover to cover the target welding seam opposite to the first opening of the vacuum cover, so that part or all of the target welding seam is covered by the vacuum cover, then the controller starts the vacuum pump to perform vacuumization on the vacuum cover, so as to establish a vacuum environment in the vacuum cover, after the vacuumization, whether bubbles are generated at the target welding seam can be observed. When the target welding seam covered by the vacuum cover leaks, due to the pressure difference between the inside and outside of the vacuum cover, the gas outside the vacuum cover enters the vacuum cover from the leakage point under the action of the pressure, so that bubbles are generated at the leakage point. Therefore, whether the target welding seam leaks can be determined according to whether bubbles are generated at the target welding seam in the vacuum environment in the vacuum cover. The checking process does not need or only needs one worker to enter the space to be detected, such as the refueling water tank, so that the adverse effects of the environment of the target to be detected on the detection personnel are effectively reduced. In addition, the loading vehicle carries the vacuum cover and the sprayer to move, compared with manual detection, the detection efficiency is higher, the loading vehicle is controlled by the controller to move along the welding seam in sequence to perform detection as needed, so that the automatic detection can be realized to a certain extent, and the overall detection efficiency is improved and the detection time is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The structure diagram of the welding seam leak detection device provided by the embodiments of the present application is shown in the figure.

[0024] Figure 2 Fig. 2 is a top view of a partial structure of a weld leakage detection device shown in Fig. 1; Figure 1

[0025] Figure 3 Fig. 3 is a schematic view of an assembly structure of a vacuum cover and a support rod of the weld leakage detection device shown in Fig. 1; Figure 1

[0026] Figure 4 Fig. 4 is a partial enlarged view of the structure shown in Fig. 3; Figure 3

[0027] Figure 5 Fig. 5 is a schematic view of a self-locking ring of the structure shown in Fig. 3. Figure 3 In the drawings:

[0028] 10, loading vehicle; 11, support; 111, support rod; 112, mounting rod; 12, bearing plate; 121, second opening;

[0029] 20, vacuum cover; 21, first opening; 211, annular sealing ring; 22, first driving member; 221, self-rotating nut; 23, self-locking ring; 231, annular mounting portion; 232, elastic clamping block;

[0030] 30, vacuum pump;

[0031] 40, sprayer; 41, nozzle;

[0032] 50, controller;

[0033] 60, monitoring device;

[0034] 100, base plate.

[0035] DETAILED DESCRIPTION In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the following will be further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0036] Figures 1 to 5 It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] ​​​​It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, the meaning of "multiple groups" is two groups or more, the meaning of "multiple pieces" is two pieces or more, and the meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0040] In a nuclear power plant, the refueling water tank is a very important facility, which is used to provide boron-containing water for the reactor pool during refueling to ensure that the reactor is in a sufficient subcritical state, thereby ensuring the safe operation of refueling. Since the refueling water tank of the nuclear power plant is near the nuclear reactor, defects in the bottom plate weld may cause boron-containing water to leak, and the boron-containing water is radioactive, which may cause serious radiation hazards to the environment and personnel. Therefore, it is necessary to detect the bottom plate weld of the refueling water tank to find potential leakage points in time, so as to take effective repair measures to avoid leakage of radioactive substances.

[0041] In the related art, when the sealing of the bottom plate of the refueling water tank is checked, the manhole of the refueling water tank needs to be opened, and the nondestructive testing personnel who have done radiation protection enter the inside of the water tank from the manhole to carry out leakage detection work. However, the inspection personnel are directly exposed to the radiation environment during inspection, and there may be certain radioactive substances in the water tank and its surrounding area, and long-term manual inspection will cause the inspection personnel to accumulate radiation dose, which may cause damage to their health, and in order to reduce the radiation hazard, the inspection personnel need to wear heavy protective equipment such as lead clothes, which will seriously affect the flexibility and operation convenience of the inspection personnel, resulting in reduced detection efficiency and quality; in addition, manual inspection depends on the experience and skill level of the inspection personnel, and different inspection personnel may have different judgment standards for weld defects, and may misjudge some small cracks, which may cause safety accidents.

[0042] Based on this, the embodiments of the present application provide a weld leak detection device to solve the above problems.

[0043] Please refer to Figures 1 to 3 The welding seam leak detection device provided by the embodiments of the present application is suitable for, but not limited to, detecting the welding seam of the bottom plate 100 of a refueling water tank of a nuclear power plant. The welding seam leak detection device comprises a loading vehicle 10, a vacuum cover 20, a vacuum pump 30, a sprayer 40 and a controller 50. The loading vehicle 10 is provided with a support 11, and the loading vehicle 10 can move along the target welding seam to be detected. The vacuum cover 20 is movably installed on the support 11, and the vacuum cover 20 is provided with a first opening 21. The support 11 is provided with a first driving member 22, and the first driving member 22 is drivingly connected with the vacuum cover 20, so that the vacuum cover 20 can be moved to cover at least part of the target welding seam. The vacuum pump 30 is installed on the support 11, and the vacuum pump 30 is connected with the vacuum cover 20, so as to perform vacuum pumping on the area covered by the vacuum cover 20 when the vacuum cover 20 covers at least part of the target welding seam. The sprayer 40 is installed on the support 11, and the sprayer 40 is used to spray leak detection liquid to the target welding seam before the vacuum cover 20 covers the target welding seam. The controller 50 is in communication connection with the loading vehicle 10, the first driving member 22, the vacuum pump 30 and the sprayer 40.

[0044] In the embodiments of the present application, the type of the loading vehicle 10 is selected according to the actual detection requirements during design. For example, a small loading vehicle 10 driven by electricity can be selected to meet the applicable requirements of as many detection sites as possible. In addition, the loading vehicle 10 must have a certain carrying capacity to meet the weight requirements of the support 11, the vacuum cover 20 and other components.

[0045] The vacuum cover 20 is made of high-strength and corrosion-resistant materials, such as stainless steel or aluminum alloy. Its shape and size are designed according to the characteristics and detection range of the target welding seam, and it is generally circular or rectangular to ensure that it can effectively cover the target welding seam.

[0046] The type of the vacuum pump 30 is determined according to the volume of the vacuum cover 20, the required vacuum pumping time and the vacuum degree requirement. For example, if the target welding seam area to be detected is large and the volume of the vacuum cover 20 is large, a vacuum pump 30 with a high air pumping rate needs to be selected. If the target welding seam area is small and the volume of the vacuum cover 20 is small, a vacuum pump 30 with a relatively low air pumping rate can be relatively suitable. The vacuum cover 20 is provided with an exhaust port, and the air outlet of the vacuum pump 30 is sealingly connected with the exhaust port of the vacuum cover 20, so that the vacuum pump 30 can pump out the gas in the vacuum cover 20 and establish a vacuum environment in the cover.

[0047] The sprayer 40 can adopt a pressure sprayer or other suitable spraying mode, and has a liquid storage tank by itself or communicates with an external liquid storage tank. The liquid storage tank has sufficient capacity to meet the demand of the detection liquid for a certain detection area. The nozzle 41 of the sprayer 40 needs to ensure that the detection liquid can be uniformly sprayed on the target weld, so that the detection liquid can uniformly cover the target weld. For example, the nozzle 41 can adopt a fan-shaped nozzle or a combination of multiple small-hole nozzles. In addition, the sprayer 40 also has a control valve, which can accurately adjust the spraying amount and is well connected with the controller 50. The detection liquid can be a water-based detection liquid such as soap solution, detergent liquid, or an organic solvent-based detection liquid, as well as other special detection liquids for special welds.

[0048] The controller 50 can be a microcontroller 50 or a programmable logic controller (PLC) with sufficient computing power and storage capacity. The programming software should have a friendly user interface to facilitate the operator to set parameters and control operations. The controller 50 can be in wired or wireless communication with the loading trolley, the first driving member 22, the vacuum pump 30 and the sprayer 40. For example, the controller 50 is equipped with a corresponding communication interface, such as RS485, Ethernet, etc., to transmit data and communicate with other components.

[0049] Before use, the weld leak detection device is assembled and debugged. During assembly, first install the support 11 on the loading vehicle 10, ensure firm installation and accurate position, then install the vacuum cover 20 on the support 11 through the first driving member 22, connect the driving circuit, debug the first driving member 22, ensure that the vacuum cover 20 can move smoothly on the support 11 and can be accurately positioned to the target weld position under the condition that the position of the loading vehicle 10 is fixed; install the vacuum pump 30 on the support 11 at a suitable position, connect the pipeline between the vacuum pump 30 and the vacuum cover 20, ensure that the pipeline is tightly connected and there is no air leakage phenomenon, install the power circuit of the vacuum pump 30 and perform preliminary power-on test, check the running state and air pumping performance of the vacuum pump 30; install the sprayer 40 on the support 11, adjust the spraying angle and position to ensure that it can accurately spray the leak detection liquid onto the target weld, connect the liquid supply pipeline and control circuit of the sprayer 40, test the spraying effect and control function of the sprayer 40, etc. Finally, the controller 50 is communicatively connected with the loading vehicle 10, the first driving member 22, the vacuum pump 30 and the sprayer 40, a control program is written according to the working process of the device, and overall debugging is performed. During the debugging process, the running parameters of each component are optimized and adjusted, such as the moving speed of the loading vehicle 10, the moving accuracy of the vacuum cover 20, the vacuum pumping time and pressure of the vacuum pump 30, the spraying amount of the sprayer 40, etc., to ensure that the entire weld leak detection device can work stably and efficiently.

[0050] During use, the operator first moves the weld leak detection device to a suitable position near the weld to be detected, and turns on the power supply, sets the relevant detection parameters such as the target vacuum degree, the spraying amount of the sprayer 40, the moving speed of the loading vehicle 10, etc. through the operation interface of the controller 50. Start the device, the loading vehicle 10 starts to move along the target weld, when approaching the weld area to be detected, the controller 50 controls the sprayer 40 to spray leak detection liquid to the target weld, when the loading vehicle 10 moves to a suitable position, the controller 50 controls the first driving member 22 to drive the vacuum cover 20 to move, so that it moves to cover part or all of the target weld. After the vacuum cover 20 covers the weld, the controller 50 starts the vacuum pump 30 to perform vacuum pumping operation on the area covered by the vacuum cover 20. The operator observes the situation in the vacuum cover 20 and the relevant data displayed by the controller 50 during the entire process. If it is found that the leak detection liquid has abnormal flow or bubbling phenomenon, it indicates that the target weld covered by the vacuum cover 20 has a leak, and the leak position and related information are recorded. After completing the detection of a section of weld, the controller 50 controls the vacuum cover 20 to lift up, the loading vehicle 10 continues to move to the next detection position, and the above detection process is repeated until the detection of the entire target weld is completed.

[0051] The welding seam leak detection device provided by the application comprises a loading vehicle 10, a vacuum cover 20, a vacuum pump 30 and a sprayer 40. The vacuum cover 20 is movably arranged on a support 11 of the loading vehicle 10. The support 11 is provided with a first driving member 22. The first driving member 22 is connected with the vacuum cover 20 to drive the vacuum cover 20 to move. The sprayer 40 is used for spraying detection liquid to a welding seam to be detected. A controller 50 is in communication connection with the loading vehicle 10, the first driving member 22 and the vacuum pump 30.

[0052] When the welding seam is detected, for example, the welding seam of the bottom plate 100 of a nuclear power plant refueling water tank, the loading vehicle 10 is moved to a position close to the welding seam of the bottom plate 100. The loading vehicle 10 is started. The controller 50 controls the loading vehicle 10 to move to a position close to the target welding seam, so that the first opening 21 of the vacuum cover 20 is aligned with part or all of the target welding seam. Then the controller 50 controls the sprayer 40 to spray detection liquid to the target welding seam, so that the detection liquid covers the target welding seam. After the spraying is completed, the first driving member 22 drives the vacuum cover 20 to move, so that the vacuum cover 20 covers the target welding seam opposite to the first opening 21. Then the controller 50 starts the vacuum pump 30 to vacuumize the vacuum cover 20, so that a vacuum environment is established in the vacuum cover 20. After the vacuumization, whether bubbles are generated at the target welding seam can be observed. When the target welding seam covered by the vacuum cover 20 leaks, because of the pressure difference between the inside and outside of the vacuum cover 20, the gas outside the vacuum cover 20 enters the vacuum cover 20 from the leakage point under the action of the pressure, so that bubbles are generated at the leakage point. Therefore, whether the target welding seam leaks can be determined according to whether bubbles are generated in the vacuum environment of the vacuum cover 20. The detection process does not need or only needs one worker to enter the space to be detected, for example, the refueling water tank, so that the adverse effects of the environment of the target to be detected on the detection personnel are effectively reduced. Meanwhile, the loading vehicle 10 is used to move the vacuum cover 20 and the sprayer 40, so that the detection efficiency is higher than that of manual detection. The loading vehicle 10 is controlled by the controller 50 to move along the welding seam in sequence to detect as needed, so that the detection is automatically performed to a certain extent, the overall detection efficiency is improved, and the detection time is shortened.

[0053] In some embodiments, as shown in Figure 3 The edge of the first opening 21 is provided with a ring-shaped sealing ring 211. For example, the ring-shaped sealing ring 211 can be sleeved on the edge of the first opening 21 or can be fused to the edge of the first opening 21. In this way, the ring-shaped sealing ring 211 is arranged on the edge of the first opening 21. The ring-shaped sealing ring 211 can be a sealing rubber ring or other sealing material. The ring-shaped sealing ring 211 is designed to ensure that a good sealing effect is achieved when the vacuum cover 20 covers the target welding seam, so that an effective vacuum environment is established.

[0054] In some embodiments, as shown in Figures 1 to 3 The loading vehicle 10 is further provided with a bearing plate 12, on which the support 11 is mounted. The bearing plate 12 is provided with a second opening 121 corresponding to the position of the vacuum cover 20. The size of the second opening 121 is larger than that of the vacuum cover 20, so that the vacuum cover 20 can pass through the second opening 121 and cover the target weld.

[0055] In the present embodiment, the bearing plate 12 is made of a suitable material according to the bearing requirements of the loading vehicle 10 and the working environment. For example, if the loading vehicle 10 needs to work in a relatively harsh industrial environment and bear heavy detection equipment, high-strength and corrosion-resistant alloy steel material can be selected. The thickness of the material is determined by calculation to ensure that the bearing plate 12 has sufficient strength and rigidity to withstand various loads without deformation or damage. The opening on the bearing plate 12 forms the second opening 121. The size of the second opening 121 meets the movement requirements of the vacuum cover 20, i.e., the size of the second opening 121 is larger than that of the vacuum cover 20 locally or as a whole, and the shape of the second opening 121 is adapted to the shape of the vacuum cover 20, such as a circular opening when the vacuum cover 20 is spherical, a square opening when the vacuum cover 20 is columnar, etc., to ensure that the vacuum cover 20 can pass through smoothly with a suitable gap.

[0056] In specific embodiments, the bearing plate 12 can be mounted on the frame of the loading vehicle 10 by welding or bolting, and then the support 11 can be welded or bolted on the bearing plate 12.

[0057] In some embodiments, as shown in Figures 1 to 3 The support 11 includes at least one support rod 111 perpendicular to the plane where the second opening 121 is located. The vacuum cover 20 is in sliding connection with the support rod 111, and the first driving member 22 drives the vacuum cover 20 to move up and down along the support rod 111 relative to the second opening 121.

[0058] In this way, the support rod 111 is provided on the support 11 to support the vacuum cover 20, and the vacuum cover 20 is movably mounted on the support rod 111. By driving the vacuum cover 20 to move relative to the support rod 111 and the second opening 121 through the first driving member 22, the vacuum cover 20 can be brought close to or away from the target weld. The support rod 111 can be one, which can be connected to a certain local position of the vacuum cover 20, or the support rod 111 can be multiple, which can be connected to multiple positions of the vacuum cover 20.

[0059] In some examples, the support 11 can include one support rod 111, which can support the vacuum cover 20 along the center of gravity position of the vacuum cover 20.

[0060] In other examples, as shown in Figures 1 to 3 The support frame 11 includes a plurality of support rods 111 arranged at intervals. The plurality of support rods 111 are arranged around the vacuum cover 20, and the vacuum cover 20 is connected to the plurality of support rods 111 at a plurality of positions in the circumferential direction one by one, thereby supporting a plurality of positions in the circumferential direction of the vacuum cover 20. The vacuum cover 20 is more uniform in stress and more smooth in movement when moving. At the same time, the load bearing requirement of a single support rod 111 is reduced, and the material selection range of the support rod 111 is wider.

[0061] In some embodiments, one of the support rod 111 and the vacuum cover 20 is provided with a sliding groove, and the other one of the vacuum cover 20 and the support rod 111 is provided with a sliding rail matched with the sliding groove. The sliding groove is perpendicular to the plane where the second opening 121 is located, and the output end of the first driving member 22 is connected to the vacuum cover 20. That is, the vacuum cover 20 and the support rod 111 are connected through the sliding groove and the sliding rail to realize sliding connection, and the output end of the first driving member 22 is connected to the vacuum cover 20 to drive the vacuum cover 20 to slide up and down along the sliding rail.

[0062] In specific embodiments, the sliding groove can be arranged in the length direction of the support rod 111, that is, in the direction perpendicular to the plane where the second opening 121 is located. Correspondingly, the sliding rail is arranged on the side wall of the vacuum cover 20. Alternatively, the sliding rail can be arranged in the length direction of the support rod 111, and the sliding groove matched with the sliding rail is arranged on the side wall of the vacuum cover 20.

[0063] In some embodiments, as shown in Figure 1 , Figure 3 and Figure 4 The first driving member 22 includes a plurality of self-turning nuts 221. The support rod 111 is a screw rod. The position where the vacuum cover 20 is connected to each support rod 111 is provided with at least one self-turning nut 221. Each self-turning nut 221 is screwed to the corresponding support rod 111. The self-turning nut 221 is self-turned to drive the vacuum cover 20 to move up and down along the support rod 111.

[0064] In actual design, according to the load condition such as the weight of the vacuum cover 20, a self-turning nut 221 of appropriate specification is selected to enable it to drive the vacuum cover 20 to move through self-turning. The material of the self-turning nut 221 has good strength, wear resistance and self-lubricating performance. For example, the self-turning nut 221 can be made of high-strength engineering plastic or alloy material. If engineering plastic is used, it is necessary to ensure that it has sufficient mechanical strength and dimensional stability, and at the same time, an appropriate amount of lubricant can be added inside the nut to reduce friction with the screw rod. If alloy material is used, appropriate heat treatment is required to improve its hardness and wear resistance. When manufacturing the self-turning nut 221, the machining precision of the thread must be strictly controlled to ensure that the fitting precision of the self-turning nut 221 and the support rod 111 meets the design requirements. The tolerance of the thread can be controlled within a certain range to ensure good transmission effect and movement precision.

[0065] The self-rotating nut 221 is a special nut that has the function of automatically rotating on the screw. Generally, the internal structure of the self-rotating nut 221 includes a special transmission mechanism or adopts a special material and shape design, so that the nut can automatically rotate when the screw is relatively stationary. For example, the self-rotating nut 221 can be a ball-type self-rotating nut 221 or an elastic self-rotating nut 221, etc. The ball-type self-rotating nut 221 adopts the principle of ball screw transmission, and by setting a circle of balls inside the nut, when an axial force is applied, the balls roll in the screw groove, thereby driving the nut to automatically rotate. The elastic self-rotating nut 221 uses the elastic deformation of the material to realize the self-rotation function, and its internal structure can include elastic elements such as spring sheets. When the nut is subjected to an axial force, the elastic elements deform, causing the threads of the nut to move relative to the threads of the screw, thereby achieving the self-rotation of the nut.

[0066] In some embodiments, the self-rotating nut 221 can be selected from the above-mentioned ball-type self-rotating nut 221 or elastic self-rotating nut 221. The driving member further includes a power member (not shown in the figure) mounted on the support plate. The output end of the power member is connected to the vacuum cover 20. The power member is used to apply a force to the vacuum cover 20 along the axial direction of the self-rotating nut 221, such as a pneumatic cylinder or a linear module, etc. When the vacuum cover 20 moves, the power member first applies a force to the vacuum cover 20, causing the vacuum cover 20 to produce relative displacement along the support rod 111, thereby driving the self-rotating nut 221 to rotate. Then, the rotation of the self-rotating nut 221 drives the vacuum cover 20 to move. In this way, the driving force of the power member is reduced, and the vacuum cover 20 is uniformly stressed during movement.

[0067] In the present embodiment, as shown in Figures 3 to 5 The position where the vacuum cover 20 is connected to each support rod 111 is also provided with a self-locking ring 23. The self-locking ring 23 is sleeved on the corresponding support rod 111, and on the same support rod 111, the self-locking ring 23 is located below the self-rotating nut 221. The self-locking ring 23 is used to lock the vacuum cover 20 at a fixed position through self-locking action when the vacuum cover 20 does not move, so that the vacuum cover 20 can maintain the state of covering the target weld or maintain the state of moving away from the target weld, etc.

[0068] The self-locking ring 23 is a mechanical part that is mainly used to realize the self-locking function between connected parts. Its basic principle is to use its own structural characteristics to prevent the relative movement between connected parts through friction, elastic deformation or mechanical interference during assembly or operation, thereby achieving the purpose of self-locking.

[0069] In the present embodiment, as shown in Figure 4 and Figure 5As shown, the self-locking ring 23 comprises a ring-shaped mounting portion 231 sleeved on the support rod 111, and an elastic clamping block 232 movably arranged on the ring-shaped mounting portion 231. The elastic clamping block 232 is arranged at least on opposite sides of the same support rod 111, and can move relative to the ring-shaped mounting portion 231 to clamp or release the support rod 111. When the vacuum cover 20 needs to be moved, the elastic clamping block 232 is released from the support rod 111, and when the vacuum cover 20 does not need to be moved, the elastic clamping block 232 clamps the support rod 111 to keep the vacuum cover 20 at the current position.

[0070] In the embodiment, the self-locking ring 23 is an electric self-locking ring, which is in communication connection with the controller 50. The controller 50 controls the self-locking ring 23 to act, so that the elastic clamping block 232 moves relative to the ring-shaped mounting portion 231 to clamp or release the corresponding support rod 111.

[0071] In some embodiments, the weld seam leakage detection device further comprises a monitoring device 60 in communication connection with the controller 50. The monitoring device 60 is movably arranged on the support frame 11. At least a portion of the vacuum cover 20 is provided with a transparent window. The monitoring device 60 can obtain image information of the inside of the vacuum cover 20 from the transparent window.

[0072] In this way, the monitoring device 60 is arranged on the loading vehicle 10, and the transparent window is arranged on the vacuum cover 20, so that the image information of the inside of the vacuum cover 20 can be obtained by the monitoring device 60. When the target weld seam covered by the vacuum cover 20 has a leakage, the monitoring device 60 monitors that a bubble appears at the position of the target weld seam in the vacuum cover 20, and transmits the image information of the bubble to the controller 50, so that the operator can determine whether the target weld seam currently detected has a leakage according to the image information displayed by the controller 50.

[0073] In specific embodiments, the support frame 11 further comprises a mounting rod 112 arranged on the vertical bearing plate 12. The monitoring device 60 is movably arranged on one end of the mounting rod 112 away from the bearing plate 12.

[0074] In some embodiments, the vacuum cover 20 is further provided with a second driving member in communication connection with the controller 50. A scale is connected to the driving end of the second driving member. The scale is used to measure the size of the bubble generated at the position of the target weld seam covered by the vacuum cover 20.

[0075] The second driving member is arranged in the vacuum cover 20, and the scale is arranged on the driving end of the second driving member. When the monitoring device 60 monitors that a bubble appears at the target weld seam, the controller 50 drives the second driving member to drive the scale to move to the position of the bubble, so as to measure the size of the bubble, thereby obtaining the size information of the bubble, and enabling the operator to estimate the leakage amount of the leakage position according to the size of the bubble.

[0076] It can be understood that, in specific embodiments, the second driving member can be a linear module or a cylinder, etc.

[0077] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A weld leak detection apparatus, characterized by, The welding seam leak detection device comprises: a loading vehicle provided with a support, the loading vehicle being capable of moving along a target welding seam to be detected; a vacuum cover movably mounted on the support, the vacuum cover being provided with a first opening, the support being provided with a first driving member, the first driving member being in driving connection with the vacuum cover so that the vacuum cover is capable of moving to cover at least part of the target welding seam; a vacuum pump mounted on the support, the vacuum pump being connected with the vacuum cover so as to perform vacuumization on an area covered by the vacuum cover when the vacuum cover covers at least part of the target welding seam; a sprayer mounted on the support, the sprayer being used to spray a leak detection liquid to the target welding seam before the vacuum cover covers the target welding seam; and a controller in communication connection with the loading vehicle, the first driving member, the vacuum pump and the sprayer. The loading vehicle is further provided with a bearing plate, the support is mounted on the bearing plate, the bearing plate is provided with a second opening corresponding to a position of the vacuum cover, the second opening has a size greater than that of the vacuum cover so that the vacuum cover can pass out of the second opening and cover the target welding seam.

2. The weld inspection apparatus of claim 1, wherein, The support comprises at least one support rod perpendicular to a plane where the second opening is located, the vacuum cover is in sliding connection with the support rod, and the first driving member drives the vacuum cover to move up and down along the support rod relative to the second opening.

3. The weld inspection apparatus of claim 2, wherein, The support comprises a plurality of support rods arranged at intervals, the plurality of support rods are arranged around the vacuum cover, and the vacuum cover is in one-to-one corresponding connection with the plurality of support rods at a plurality of circumferential positions.

4. The weld inspection apparatus of claim 3, wherein, One of the support rod and the vacuum cover is provided with a sliding groove, the other of the vacuum cover and the support rod is provided with a sliding rail in adaptive clamping connection with the sliding groove, the sliding groove is perpendicular to the plane where the second opening is located, and an output end of the first driving member is connected with the vacuum cover.

5. The weld inspection apparatus of claim 4, wherein, The first driving member comprises a plurality of self-rotating nuts, the support rod is a screw rod, at least one self-rotating nut is arranged at a position where the vacuum cover is connected with each support rod, each self-rotating nut is screwed on the corresponding support rod, and the self-rotating nut rotates to drive the vacuum cover to move up and down along the support rod.

6. The weld inspection apparatus of claim 4, wherein, The position where the vacuum cover is connected with each support rod is further provided with a self-locking ring, the self-locking ring is sleeved on the corresponding support rod, and on the same support rod, the self-locking ring is located below the self-rotating nut.

7. The weld inspection apparatus of claim 6, wherein, A rim portion of the first opening is provided with an annular sealing ring.

8. A weld inspection apparatus as claimed in any one of claims 1 to 7, wherein, The welding seam leak detection device further comprises a monitoring device in communication connection with the controller, the monitoring device is movably mounted on the support, at least part of the vacuum cover is provided with a transparent window, and the monitoring device is capable of acquiring image information in the vacuum cover from the transparent window.

9. A weld inspection apparatus as claimed in any one of claims 1 to 7, wherein, The vacuum cover is further provided with a second driving member in communication connection with the controller, a scale is connected with a driving end of the second driving member, and the scale is used to measure a size of a bubble generated at a position of the target welding seam covered by the vacuum cover.

10. The weld inspection apparatus of claim 9, wherein, ​

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