Welding device and method for side wall of liquid reservoir

Abstract

The welding device and welding method for the side wall of a liquid reservoir. The hatch structure (10) of the welding device for the side wall of a liquid reservoir includes a preparation chamber (11) and a drainage chamber (12) arranged horizontally, the preparation chamber (11) and the drainage chamber (12) communicate with each other through an operation window (20), the preparation chamber (11) is provided with a welding equipment, and the drainage chamber (12) is provided with an opening (121) for sealing contact with the side wall. The seal plate (30) can automatically close or open the operation window (20) to separate or communicate the preparation chamber (11) and the drainage chamber (12). The position holding structure (40) holds the hatch structure (10) at a predetermined depth in the liquid reservoir and seals and attaches the opening (121) to the side wall of the liquid reservoir. The drainage opening (51) of the drainage structure (50) is installed at the bottom of the drainage chamber (12), and the gas supply device delivers gas into the drainage chamber (12) to empty the liquid when the opening (121) is sealed and attached to the side wall of the liquid reservoir and the sealing plate (30) closes the access window (20). After the liquid in the drainage chamber (12) is emptied, the welding tool of the welding equipment enters the drainage chamber (12) through the access window (20) and welds and / or repairs it to a predetermined position on the side wall.

Description

[Technical field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on November 4, 2021, bearing application number 202111298730.0 and entitled "Welding apparatus and welding method for liquid reservoir side wall," the entire contents of which are incorporated herein by reference.

[0002] Technical Field The present invention relates to the technical field of welding equipment in a liquid reservoir, and in particular to a device and a method for welding a side wall of a liquid reservoir. [Background technology]

[0003] Background technology In the industrial field, there are many metal structure reservoirs for storing liquids, which are used in complex conditions and environments for a long time, so the metal side walls of the metal structure reservoirs are prone to defects such as cracks, pitting corrosion, and stress corrosion. These defects can cause serious consequences such as a decrease in the bearing capacity of the structure, the occurrence of stored liquid leakage, and even catastrophic rupture. Therefore, when defects are found in the side walls of the rigid structure of the reservoir, welding and maintenance must be carried out for the defects in the side walls.

[0004] Generally, the conventional maintenance method is to empty all the liquid in the puddle and carry out the welding repair in a completely dry environment. However, the liquid stored in some puddles has special properties and cannot be emptied directly, and the displacement of the liquid also generates huge economic costs. For example, for the spent fuel puddle of a nuclear power plant, in order to ensure the normal performance of functions such as cooling, the best method is to carry out the welding repair of the side wall without emptying the spent fuel puddle. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, how to design a welding device that can weld to the inner wall of a puddle while the puddle is filled with liquid has become a hot spot of research in the industry. [Means for solving the problem]

[0006] Summary of the Invention It is an object of the present embodiment to provide a puddle sidewall welding apparatus that creates a localized dry environment on the sidewall while the puddle is filled with liquid, facilitating welding and repair of the puddle inner wall.

[0007] A second object of the embodiment of the present application is to provide a method for welding a side wall of a liquid reservoir using the above-mentioned welding apparatus for a side wall of a liquid reservoir.

[0008] The first aspect provides a welding device for a side wall of a liquid reservoir, the welding device comprising a hatch structure, a seal plate, a position-retaining structure, and a drainage structure. The hatch structure comprises a preparation chamber and a drainage chamber arranged horizontally, the preparation chamber and the drainage chamber communicate with each other through an operation window, a welding device is installed in the preparation chamber, and an opening for sealingly contacting the side wall of the liquid reservoir is arranged in the drainage chamber. The seal plate can automatically close the operation window to separate the preparation chamber and the drainage chamber, and automatically open the operation window to communicate the preparation chamber and the drainage chamber. The position-retaining structure is connected to the hatch structure, and holds the hatch structure at a predetermined depth in the liquid reservoir and seals and attaches the opening to the side wall of the liquid reservoir. The drainage structure comprises a drainage opening installed at the bottom of the drainage chamber, and a gas supply device that transports gas into the drainage chamber to empty the liquid in the drainage chamber when the opening is sealed and attached to the side wall of the liquid reservoir and the seal plate closes the operation window. A welding tool of the welding equipment enters the drain chamber through an access window after the drain chamber has been emptied of liquid and welds and / or repairs the side wall in place.

[0009] In one possible embodiment, the position maintaining structure includes a traction assembly connected to the upper part of the hatch structure to adjust the spatial position of the hatch structure within the reservoir, and an adsorption member provided around the open mouth of the drainage chamber to adsorb the side wall and seal and attach the open mouth of the drainage chamber to the side wall of the reservoir.

[0010] In one possible embodiment, the position maintaining structure further comprises a propelling assembly disposed on the outer periphery of the hatch structure to affix the suction member to the side wall of the reservoir.

[0011] In one possible embodiment, the position holding structure includes an arm module having a clamp portion connected to the hatch structure and a base positioned outside the reservoir, the arm module attaching the open mouth of the drainage chamber to the side wall.

[0012] In one possible embodiment, the drain is provided with a check valve that only allows transport of liquid from inside to outside the drain chamber.

[0013] In one possible embodiment, the apparatus further includes a hot air device communicating with the drainage chamber to blow hot air into the drainage chamber.

[0014] In one possible embodiment, the hatch structure further comprises a counterweight located at the bottom, side, or top of the hatch structure.

[0015] In one possible embodiment, the sealing plate comprises a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate being rotatably connected to both side edges of the operation window, respectively, and closing the operation window when the first sealing plate and the second sealing plate rotate toward the center of the operation window and come into contact with each other and are attached to each other.

[0016] In one possible embodiment, the welding apparatus includes a first position adjustment assembly having a switchable abrasive tool and a fixed tool mounted thereon, and a second position adjustment assembly having a welding gun mounted thereon, the abrasive tool, the fixed tool and the welding gun entering the drain chamber through an access window to weld and / or repair to a predetermined position on the side wall after the drain chamber has been emptied.

[0017] In one possible embodiment, the welding device for the side wall of the liquid reservoir further includes a seal structure having an annular support plate and a seal strip. The annular support plate has an outer ring shape that is the same as the cross-sectional shape of the preparation chamber, the outer ring edge of the annular support plate is fixedly connected to and sealed with the inner wall of the preparation chamber, the annular support plate is parallel to the operation window, and the size of the middle opening of the annular support plate is smaller than the size of the operation window as a whole. The seal strip is installed along the middle opening edge of the annular support plate to form an annular arrangement, and when the seal plate closes the operation window, the surface of the seal plate facing the preparation chamber is pressed against the seal strip to form a seal.

[0018] According to a second aspect of the present application, there is also provided a method for welding a side wall of a reservoir using the welding apparatus for a side wall of a reservoir according to the above aspect, comprising the following steps.

[0019] S1: Before the welding device enters the liquid pool, the sealing plate closes the operation window, completely isolating the preparation chamber and the drainage chamber, and sealing the preparation chamber; S2: The position holding structure is formed by aligning the opening of the drainage chamber with the position to be welded on the side wall of the liquid reservoir, and then sealing and pasting the opening of the drainage chamber to the side wall; S3: The gas supply device of the drainage structure constantly sends gas to the drainage chamber, and gradually discharges the liquid in the drainage chamber to the outside of the drainage chamber through the drainage port; S4: After the liquid in the drain chamber is emptied, the sealing plate opens the operation window; S5: The welding equipment performs welding and / or repair work on the position to be welded on the side wall of the liquid reservoir through the operation window; S6: After the welding and / or repair work is completed, the welding equipment exits through the operation window, the sealing plate closes the operation window, and the entire apparatus retreats from the liquid pool.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: The welding device for the side wall of a puddle of the present application does not require emptying the liquid in the puddle during operation, and by constructing a local dry welding space at the welding position of the side wall of the puddle, welding or repair work can be performed on the side wall even when liquid is stored in the puddle, which has little effect on the normal operation of the puddle and can significantly reduce economic costs.

[0021] BRIEF DESCRIPTION OF THE DRAWINGS Hereinafter, in order to more clearly explain the technical solutions in the embodiments of the present application, the drawings required in the embodiments will be briefly described. Obviously, the following drawings are only for illustrating some embodiments of the present application, and should not be regarded as limiting the scope, and those skilled in the art can also obtain other drawings based on these drawings without creative labor. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram of the overall configuration of a welding device for a side wall of a liquid reservoir according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing how a welding device for a side wall of a liquid reservoir according to an embodiment of the present invention bonds the side wall. [Diagram 3] FIG. 3 is a schematic diagram of drainage of a drain chamber in a welding device for a side wall of a liquid reservoir according to an embodiment of the present application. [Figure 4] FIG. 4 is a diagram showing an open state of a seal plate in a welding device for a side wall of a liquid reservoir according to an embodiment of the present application. [Diagram 5] FIG. 5 is a schematic diagram of polishing defect positions of a welding device for a side wall of a liquid reservoir according to an embodiment of the present application. [Figure 6] FIG. 6 is a schematic diagram of repair plate spot welding by the welding device for the side wall of a liquid reservoir according to an embodiment of the present application. [Figure 7]FIG. 7 is a schematic diagram of repair plate welding by the welding device for the side wall of a liquid reservoir according to an embodiment of the present application. [Figure 8] FIG. 8 is a schematic diagram showing a sealing structure of a welding device for a side wall of a liquid reservoir according to an embodiment of the present application, in which sealing is performed by bonding to a sealing plate. [Figure 9] FIG. 9 is a schematic front perspective view of a seal structure of a welding device for a liquid reservoir side wall according to an embodiment of the present application. [Figure 10] FIG. 10 is a schematic rear perspective view of a seal structure of a welding device for a side wall of a liquid reservoir according to an embodiment of the present application. [Figure 11] FIG. 11 is a schematic cross-sectional view of a seal structure of a welding device for a side wall of a liquid reservoir according to an embodiment of the present invention. [Figure 12] FIG. 12 is a flowchart of a method for welding a side wall of a liquid reservoir according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In the figure: 10, hatch structure, 11, preparation chamber, 111, first attitude adjustment assembly, 1111, grinding tool, 1112, fixed tool, 112, second attitude adjustment assembly, 1121, welding gun, 12, drain chamber, 121, opening, 20, operation window, 30, sealing plate, 31, first sealing plate, 32, second sealing plate, 40, position holding structure, 41, traction assembly, 42, suction member, 43, propulsion assembly, 50, drain structure, 51, drain port, 52, intake passage, 60, counterweight, 70, sealing structure, 71, annular support plate, 72, sealing strip, 721, compressible portion, 722, non-compressible portion, 73, magnetic stripe, 100, repair plate, S1 to S6, steps.

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application, but of course, the described embodiments are only a part of the embodiments of the present application, and not the whole of the embodiments. Generally, the assemblies of the embodiments of the present application described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0025] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the present application which requires protection, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can achieve without any creative effort will fall within the scope of protection of the present application.

[0026] According to a first aspect of the present application, referring to FIG. 1, first, a welding device for a side wall of a liquid reservoir is provided, the device comprising a hatch structure 10, a seal plate 30, a position-retaining structure 40, and a drainage structure 50. The hatch structure 10 comprises a preparation chamber 11 and a drainage chamber 12 arranged horizontally, the preparation chamber 11 and the drainage chamber 12 communicate with each other through an operation window 20, a welding device is installed in the preparation chamber 11, and an opening 121 for sealingly contacting with the side wall of the liquid reservoir is arranged in the drainage chamber 12. The seal plate 30 can automatically close the operation window 20 to separate the preparation chamber 11 and the drainage chamber 12, or automatically open the operation window 20 to communicate the preparation chamber 11 and the drainage chamber 12. The position-retaining structure 40 is connected to the hatch structure 10, and holds the hatch structure 10 in the liquid reservoir at a predetermined depth and seals and attaches the opening 121 to the side wall of the liquid reservoir. The drainage structure 50 includes a drainage port 51 installed at the bottom of the drainage chamber 12, and a gas supply device for delivering gas into the drainage chamber 12 to empty the liquid in the drainage chamber 12 when the open port 121 is sealed and attached to the side wall of the liquid reservoir and the sealing plate 30 closes the access window 20. After the liquid in the drainage chamber 12 is emptied, a welding tool of the welding equipment enters the drainage chamber 12 through the access window 20 to weld and / or repair it to a predetermined position on the side wall.

[0027] When the welding device for the side wall of the pool is operated, first, before the welding device enters the pool, the sealing plate 30 closes the operation window 20, completely isolates the preparation chamber 11 and the drainage chamber 12, and seals the preparation chamber 11. Then, referring to FIG. 2, the position holding structure 40 aligns the operation window 20 with the position to be welded on the side wall, and then seals and pastes the open port 121 of the drainage chamber 12 to the side wall. Next, referring to FIG. 3, the gas supply device of the drainage structure 50 constantly sends gas to the drainage chamber 12, gradually draining the liquid in the drainage chamber 12 to the outside of the drainage chamber 12 through the drainage port 51, and emptying the liquid in the drainage chamber 12. The inner cavity of the drainage chamber 12 emptied of the liquid is a local dry environment, which creates a local dry welding environment on the side wall of the pool, providing convenient conditions for the next welding. Finally, referring to Fig. 4, the sealing plate 30 opens the operation window 20, and the welding equipment performs welding or welding repair work on the position of the side wall to be welded through the operation window 20. For this reason, the welding device for the side wall of the liquid pool does not need to empty the liquid in the liquid pool when it is operated, and referring to Figs. 5 to 7, by constructing a local dry welding space at the welding position of the side wall of the liquid pool, it is possible to perform welding or repair work on the side wall even when liquid is stored in the liquid pool, with little effect on the normal operation of the liquid pool.

[0028] In addition, the left-right separation design of the drainage chamber 12 and the preparation chamber 11 is advantageous not only for protecting the welding equipment in the preparation chamber 11, but also for creating a local dry environment in the drainage chamber 12. Until the hatch structure 10 enters the liquid pool and the liquid in the drainage chamber 12 is emptied, the preparation chamber 11 is in a sealed state, which provides good protection for the welding equipment inside. After the liquid in the drainage chamber 12 is emptied, the welding tools of the welding equipment in the preparation chamber 11 enter the drainage chamber 12 to perform welding work, so that each part in the preparation chamber 11 does not come into contact with water, which ensures the reliability of the underwater work of each equipment part.

[0029] 1, in one embodiment, the position maintaining structure 40 includes a traction assembly 41 and an adsorption member 42. The traction assembly 41 is connected to the top of the hatch structure 10 to adjust the spatial position of the hatch structure 10 in the liquid reservoir. The adsorption member 42 is provided around the opening 121 of the drainage chamber 12 and adsorbs the sidewall to seal and attach the opening 121 of the drainage chamber 12 to the sidewall of the liquid reservoir. The traction assembly 41 can tow the hatch structure 10 so as to insert the hatch structure 10 into the liquid pool to maintain a certain height in the liquid pool, and move the hatch structure 10 to the position of the side wall in the liquid pool. Then, when the open opening 121 is attached to the side wall, the suction member 42 adheres closely to the side wall and firmly adsorbs the side wall, so as to seal and attach the open opening 121 to the side wall, thereby preventing liquid from entering during the drainage process of the drainage chamber 12 and affecting the drainage effect, and is also advantageous for maintaining a dry environment after the subsequent drainage of the drainage chamber 12.

[0030] In one embodiment, the traction assembly 41 may use a crane or winch in conjunction with wire ropes to achieve traction.

[0031] In one embodiment, the suction member 42 comprises a plurality of vacuum suction cups arranged on the outer periphery of the drainage chamber 12 and uniformly distributed around the open mouth 121 of the drainage chamber 12, the suction surface of the vacuum suction cup is in the same direction as the open mouth 121, and when the vacuum suction cup is operated, the vacuum suction cup suctions the side wall to seal and attach the open mouth 121 to the side wall. A water ring vacuum pump can be used to provide the vacuum suction force to the vacuum suction cup.

[0032] In one embodiment, the adsorption member 42 comprises a plurality of electromagnetic suction cups arranged around the outer periphery of the drainage chamber 12 and evenly distributed around the open mouth 121 of the drainage chamber 12, the adsorption surface of the electromagnetic suction cups is in the same direction as the open mouth 121, and when the electromagnetic suction cups are activated, the electromagnetic suction cups adsorb the side wall to seal and attach the open mouth 121 to the side wall.

[0033] In one embodiment, a sealant is provided at the hatch position where the opening 121 of the drainage chamber 12 is bonded to the side wall, and a seal ring is also provided at the position where the seal plate 30 is fitted to the operation window 20. The sealant can make the opening 121 adhere to the side wall of the liquid reservoir even if the side wall is uneven. The seal ring ensures that the seal plate 30 forms a tight fit with the operation window 20 when the entire welding equipment is immersed in water, and ensures that liquid will not enter the preparation chamber 11 through the operation window 20 and cause corrosion damage to the welding equipment in the preparation chamber 11.

[0034] 1, in one embodiment, the position maintaining structure 40 further includes a propulsion assembly 43 disposed on the outer periphery of the hatch structure 10 to attach the adsorption member 42 to the side wall of the liquid pool. The propulsion assembly 43 can compensate for the deficiency of the towing assembly 41, and when the towing assembly 41 does not bring the opening 121 as close as possible to the side wall, the propulsion assembly 43 pushes the opening 121 further to the side wall to attach the adsorption member 42 to the side wall. The propulsion assembly 43 can realize the lateral movement of the hatch structure 10 using an underwater propulsion device such as a propeller.

[0035] In one embodiment, the position-maintaining structure 40 includes an arm module having a clamp portion connected to the hatch structure 10 and a base installed outside the reservoir, and the arm module sealably attaches the open mouth 121 of the drainage chamber 12 to the side wall. The position-maintaining structure 40 can realize the change in position of the hatch structure 10 in the reservoir using a device such as a multi-degree-of-freedom module or a multi-degree-of-freedom arm.

[0036] In one embodiment, the drain port 51 is provided with a check valve that only allows the transport of liquid from inside to outside the drain chamber 12. The check valve ensures that liquid in the drain chamber 12 does not flow back after it has been emptied.

[0037] In one embodiment, the apparatus further includes a hot air device communicating with the drain chamber 12 and blowing hot air into the drain chamber 12. After the gas supply device supplies air into the drain chamber 12 to empty the liquid in the drain chamber 12, some of the remaining liquid may accumulate at the bottom of the drain chamber 12, and the hot air device blows hot air into the drain chamber 12 to dry the remaining liquid, thereby further enhancing the drying effect due to the local dry environment of the underwater side wall and improving the welding quality. The hatch structure 10 may be provided with a gas exhaust port communicating with the air outside the liquid pool and discharging excess gas in the hatch structure 10 to the outside.

[0038] In one embodiment, referring to Figs. 1 to 7, the drainage structure 50 further includes an intake passage 52 for leading gas from the gas supply device and the hot air device into the drainage chamber 12. The intake passage 52 is for connecting the gas supply device and the hot air device. The intake passage 52 is shared to reduce the number of ports and the risk of leakage. When draining the drainage chamber 12, the hot air device is not operated, and the gas supply device sends gas into the drainage chamber 12 through the intake passage 52, and after the liquid in the drainage chamber 12 is emptied, the hot air device sends hot air into the drainage chamber 12 through the intake passage 52 to dry the remaining liquid in the drainage chamber 12. The hot air device may be realized by installing a heater in the pipe from the gas supply device to the intake passage 52, or may be realized by using a device that generates hot air alone and connecting it in parallel to the gas supply device and the intake passage 52.

[0039] In one embodiment, the intake passage 52 is provided with a check valve or an electric valve to ensure that gas is transported only from the intake passage 52 into the drainage chamber 12. The intake passage 52 may be provided with a multi-way solenoid valve to realize switching of gas transport between the hot air device and the gas supply device.

[0040] 1, in one embodiment, the hatch structure 10 further includes a counterweight 60 disposed at the bottom, side, or top. The function of the counterweight 60 has two aspects: on the one hand, the counterweight 60 increases the overall weight of the welding device, so that the welding device can sink in the pool against the buoyancy of the pool; on the other hand, the counterweight 60 is installed in the hatch structure 10, which is advantageous for maintaining the balance of the welding device in the pool.

[0041] In one embodiment, referring to Figs. 1 to 7, the sealing plate 30 includes a first sealing plate 31 and a second sealing plate 32, which are rotatably connected to both side edges of the operation window 20, respectively. When the first sealing plate 31 and the second sealing plate 32 rotate toward the center of the operation window 20 and come into contact with each other to be stuck together, the operation window 20 is closed. The first sealing plate 31 and the second sealing plate 32, which are opened and closed in both directions, can increase the degree of opening and closing of the operation window 20 and shorten the length of the first sealing plate 31 and the second sealing plate 32, and accordingly, the thickness of the drainage chamber 12 can be reduced, the volume of the drainage chamber 12 can be reduced, and the pressure of the drainage can be reduced. The first sealing plate 31 and the second sealing plate 32 may be driven to rotate using a hydraulic tension rod, or a combination structure of a motor and a link may be used, or a power device such as a motor that drives rotation may be provided to the rotary joint.

[0042] In one embodiment, referring to Figs. 1 to 7, the welding device includes a first position adjustment assembly 111 to which a switchable grinding tool 1111 and a fixed tool 1112 are attached, and a second position adjustment assembly 112 to which a welding gun 1121 is attached. After the drain chamber 12 is emptied, the grinding tool 1111, the fixed tool 1112, and the welding gun 1121 enter the drain chamber 12 through the operation window 20 to perform welding and / or repair on a predetermined position of the side wall. The first position adjustment assembly 111 and the second position adjustment assembly 112 sandwich a tool related to welding and perform welding work. If only welding is required on the side wall, the second position adjustment assembly 112 changes its position and passes the welding gun 1121 through the operation window 20 to weld the welding position of the side wall. If the sidewall needs to be repaired, generally, the first position adjustment assembly 111 is operated to first grind the defective portion using the grinding tool 1111, then switch to the fixed tool 1112, which clamps the repair plate 100 and positions it at the defective portion, and finally, the second position adjustment assembly 112 is operated to fix the repair plate 100 by spot welding using the welding gun 1121, and then the fixed tool 1112 is removed and the entire repair plate 100 is welded and repaired using the welding gun 1121. The first position adjustment assembly 111 and the second position adjustment assembly 112 can cooperate with each other to better perform different work processes such as welding and repair.

[0043] In addition, the first attitude adjustment assembly 111 and the second attitude adjustment assembly 112 can adopt a multi-degree-of-freedom arm, a multi-degree-of-freedom screw rod, a timing tape module, etc. The size of the repair plate 100 is customized according to the type, size, and depth of the defect.

[0044] In one embodiment, a water level detection sensor may be provided within the drain chamber 12 to detect whether the liquid within the drain chamber 12 has been emptied, the water level detection sensor being positioned around the inner wall of the drain chamber 12 in close proximity to the opening 121.

[0045] In one embodiment, a humidity sensor may be provided within the drain chamber 12 to detect humidity within the drain chamber 12, and the humidity sensor provides start and stop signals to the hot air device to facilitate controlling the humidity environment within the drain chamber 12 to ensure welding quality.

[0046] In one embodiment, cameras are provided within the preparation chamber 11 or mounted at the moving ends of the first attitude adjustment assembly 111 and the second attitude adjustment assembly 112 to facilitate monitoring of the internal environment.

[0047] In one embodiment, the apparatus further includes a controller and a remote control, the remote control being other equipment such as a mobile phone, a computer, etc. capable of transmitting or receiving signals, which exchanges information with the controller via the remote control, and the controller controls the movement of the sealing plate 30 in the welding apparatus, the operation of the gas supply device, the operation of the hot air device, the operation of the adjustment assembly, the switch of the welding gun 1121, etc. based on the information command. The remote control of underwater welding makes it possible to work in a steel structure pool in a complex environment, and is particularly suitable for underwater environments where workers cannot reach.

[0048] In one embodiment, as shown in Figs. 8 to 10, the welding device for the side wall of the liquid reservoir further includes a seal structure 70 having an annular support plate 71 and a magnetic seal strip 72. The outer ring shape of the annular support plate 71 is the same as the cross-sectional shape of the preparation chamber 11, the outer ring edge of the annular support plate 71 is fixedly connected to the inner wall of the preparation chamber 11 to be sealed, the annular support plate 71 is parallel to the operation window 20, and the size of the middle opening of the annular support plate 71 is smaller than the size of the operation window 20 as a whole. The seal strip 72 is installed along the middle opening edge of the annular support plate 71 to form an annular arrangement, and when the seal plate 30 closes the operation window 20, the surface of the seal plate 30 facing the preparation chamber 11 is pressed against the seal strip 72 to form a seal.

[0049] After the sealing plate 30 and the annularly arranged sealing strip 72 are bonded together, the sealing plate 30, the sealing strip 72 and the annular support plate 71 cooperate to achieve a complete sealing isolation between the drainage chamber 12 and the preparation chamber 11. With the increase of the water depth, the water pressure in the drainage chamber 12 increases, and the sealing plate 30 is further pressed against the sealing strip 72 to achieve a better sealing effect.

[0050] In one embodiment, as shown in Fig. 11, a cavity is provided inside the seal strip 72 along its extension direction, the cavity is adjacent to the side to be bonded with the seal plate 30, and a magnetic stripe 73 is disposed inside the cavity, and the magnetic stripe 73 can adsorb the seal plate 30, so that the seal strip 72 and the seal plate 30 form an effective and stable seal bond. The magnetic stripe 73 may be made of plastic or rubber with added magnetic powder, or may be made by co-extrusion of iron ore powder and plastic or iron ore powder and rubber followed by magnetic filling.

[0051] 11, the sealing strip 72 includes a compressible portion 721 and a non-compressible portion 722, the non-compressible portion 722 and the compressible portion 721 being of one-piece construction, the bottom of the non-compressible portion 722 being sealingly fixed to the annular support plate 71, and the compressible portion 721 being located on top of the non-compressible portion 722 for lamination with the sealing plate 30. The compressible portion 721 may be a pleated structure defining an intermediate cavity, or may be made of a solid but compressible material. After the sealing plate 30 is pressed against the compressible portion 721, the compressible portion 721 is compressed in accordance with the compression of the sealing plate 30, and due to the support of the compressible portion 721 by the non-compressible portion 722, the sealing plate 30 compresses the compressible portion 721 to a certain extent and stops, and the pressing of the non-compressible portion 722 and the sealing plate 30 corresponds to tight contact between the compressible portion 721 and the sealing plate 30. The cavity for arranging the magnetic stripe 73 is provided in the compressible portion 721 on the side attached to the sealing plate 30 so as to facilitate adhesion between the magnetic stripe 73 and the sealing plate 30.

[0052] According to a second aspect of the present application, referring to FIG. 12, there is also provided a method for welding a side wall of a reservoir using the welding device for the side wall of a reservoir in the above technical solution, comprising the following steps:

[0053] S1: Before the welding device enters the liquid pool, the seal plate 30 is in a state of closing the operation window 20, completely isolating the preparation chamber 11 and the drainage chamber 12, and sealing the preparation chamber 11.

[0054] In step S1, if a side wall is to be welded, a welding gun 1121 needs to be attached to the second position adjustment assembly 112, and if a weld repair is to be performed, a grinding tool 1111 and a fixed tool 1112 need to be attached to the first position adjustment assembly 111, and the necessary repair plate 100 or reinforcement material needs to be attached to the fixed tool 1112.

[0055] S2: The position-retaining structure 40 aligns the open port 121 of the drainage chamber 12 with the position to be welded on the liquid reservoir side wall, and then seals and bonds the open port 121 of the drainage chamber 12 to the side wall.

[0056] S3: The gas supply device of the drainage structure 50 constantly sends gas to the drainage chamber 12, gradually discharging the liquid in the drainage chamber 12 to the outside of the drainage chamber 12 through the drainage port 51.

[0057] S4: After the liquid in the drain chamber 12 has been emptied, the sealing plate 30 opens the access window 20.

[0058] S5: The welding equipment performs welding and / or repair work on the portion of the side wall of the liquid reservoir that needs to be welded through the operation window 20.

[0059] In step S5, when performing repair work, first, the defective position is polished using the polishing tool 1111 (as shown in FIG. 5). Then, the fixed tool 1112 is used to align the repair plate 100, and the welding gun 1121 performs spot welding around the periphery of the repair plate 100 (as shown in FIG. 6) to realize the fixing of the repair plate 100. Finally, the polishing tool 1111 and the fixed tool 1112 are moved away from the operation window 20, out of the area to be welded, and to the edge of the welding device, and the welding gun 1121 performs the final welding on the repair plate 100 (as shown in FIG. 7).

[0060] S6: After the welding and / or repair work is completed, the welding equipment is withdrawn from the operation window 20, the sealing plate 30 closes the operation window 20, and the entire apparatus is withdrawn from the liquid pool.

[0061] In step S6, before the welding device is withdrawn from the side wall of the puddle, or after welding is completed, the entire device needs to slowly withdraw from the puddle after the welding position has cooled to a certain extent.

[0062] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. a hatch structure (10) including a preparation chamber (11) and a drainage chamber (12) arranged horizontally, the preparation chamber (11) and the drainage chamber (12) communicating with each other through an operation window (20), a welding device being installed in the preparation chamber (11), and an opening (121) being arranged in the drainage chamber (12) for sealingly contacting with a side wall of the liquid reservoir; a seal plate (30) that can automatically close the operation window (20) so as to separate the preparation chamber (11) from the drainage chamber (12) and automatically open the operation window (20) so as to communicate the preparation chamber (11) with the drainage chamber (12); a position retaining structure (40) connected to the hatch structure (10), retaining the hatch structure (10) at a predetermined depth in the liquid reservoir, and sealingly attaching the opening (121) to a side wall of the liquid reservoir; a drainage structure (50) including a drainage port (51) installed at the bottom of the drainage chamber (12), and a gas supply device that seals and attaches the opening (121) to the side wall of the liquid reservoir and delivers gas into the drainage chamber (12) when the sealing plate (30) closes the operation window (20) to empty the liquid in the drainage chamber (12); The welding tool of the welding equipment enters the drain chamber (12) through the access window (20) and welds and / or repairs the side wall in place after the drain chamber (12) has been emptied of liquid. A welding device for a side wall of a liquid reservoir.

2. The position-maintaining structure (40) comprises: a traction assembly (41) connected to an upper portion of the hatch structure (10) for adjusting the spatial position of the hatch structure (10) within the liquid reservoir; The welding device for a side wall of a liquid reservoir as described in claim 1, further comprising an adsorption member (42) provided around the open mouth (121) of the drainage chamber (12) and adsorbing the side wall to seal and attach the open mouth (121) of the drainage chamber (12) to the side wall of the liquid reservoir.

3. The liquid reservoir sidewall welding device according to claim 2, characterized in that the position maintaining structure (40) further comprises a pushing assembly (43) installed on the outer periphery of the hatch structure (10) to attach the suction member (42) to the liquid reservoir sidewall.

4. The welding device for a liquid reservoir side wall as described in claim 1, characterized in that the position holding structure (40) includes an arm module having a clamp portion connected to the hatch structure (10) and a base installed outside the liquid reservoir, and the arm module seals and attaches the open mouth (121) of the liquid drainage chamber (12) to the side wall.

5. 2. The welding device for a side wall of a reservoir according to claim 1, characterized in that the drain port (51) is provided with a check valve that allows only the transport of liquid from the inside to the outside of the drain chamber (12).

6. 6. The welding apparatus for a side wall of a liquid reservoir according to claim 5, further comprising a hot air device communicating with the drain chamber (12) for blowing hot air into the drain chamber (12).

7. The sump sidewall welding apparatus of claim 1, further comprising a counterweight (60) disposed on the bottom, side, or top of the hatch structure (10).

8. The welding device for a liquid reservoir side wall as described in claim 1, characterized in that the sealing plate (30) comprises a first sealing plate (31) and a second sealing plate (32), the first sealing plate (31) and the second sealing plate (32) are rotatably connected to both side edges of the operation window (20), respectively, and the operation window (20) is closed when the first sealing plate (31) and the second sealing plate (32) rotate toward the center of the operation window (20) to come into contact with each other and be bonded together.

9. The welding apparatus for a puddle sidewall, as described in claim 1, characterized in that the welding apparatus comprises a first position adjustment assembly (111) to which a switchable grinding tool (1111) and a fixed tool (1112) are attached, and a second position adjustment assembly (112) to which a welding gun (1121) is attached, and the grinding tool (1111), the fixed tool (1112) and the welding gun (1121) enter the drain chamber (12) through the operating window (20) after the drain chamber (12) has been emptied to weld and / or repair a predetermined position of the sidewall.

10. The welding apparatus for the sidewall of the reservoir further comprises a sealing structure (70) having an annular support plate (71) and a sealing strip (72); the annular support plate (71) has an outer ring shape that is the same as the cross-sectional shape of the preparation chamber (11), the outer ring edge of the annular support plate (71) is fixedly connected and sealed to the inner wall of the preparation chamber (11), the annular support plate (71) is parallel to the operation window (20), and the dimensions of the intermediate opening of the annular support plate (71) are smaller than the dimensions of the operation window (20) as a whole; The welding device for a liquid reservoir side wall as described in claim 1, characterized in that the sealing strip (72) is installed along the middle opening edge of the annular support plate (71) to form an annular arrangement, and when the sealing plate (30) closes the operation window (20), the surface of the sealing plate (30) facing the preparation chamber (11) is pressed against the sealing strip (72) to form a seal.

11. A method for welding a side wall of a reservoir using the welding device for a side wall of a reservoir according to any one of claims 1 to 10, comprising the steps of: S1: Before the welding device enters the liquid pool, the seal plate (30) closes the operation window (20), completely isolating the preparation chamber (11) and the drain chamber (12), and sealing the preparation chamber (11). S2: The position-retaining structure (40) aligns the open port (121) of the drainage chamber (12) with the position to be welded on the side wall of the liquid reservoir, and then seals and bonds the open port (121) of the drainage chamber (12) to the side wall; S3: The gas supply device of the drainage structure (50) continuously sends gas to the drainage chamber (12), and gradually discharges the liquid in the drainage chamber (12) to the outside of the drainage chamber (12) through the drainage port (51); S4: After the liquid in the drain chamber (12) has been emptied, the sealing plate (30) opens the access window (20); S5: The welding equipment performs welding and / or repair work on the position to be welded on the side wall of the liquid reservoir through the operation window (20). S6: After the welding and / or repair work is completed, the welding equipment exits through the operation window (20), the sealing plate (30) closes the operation window (20), and the entire apparatus retreats from the liquid pool. The step A method for welding a side wall of a liquid reservoir using a side wall welding device comprising:

Images