Tank welding system and tank welding method

Abstract

The invention provides a tank welding system and a tank welding method. The tank welding system comprises a welding device, a first magnetic attraction tracking vehicle, a second magnetic attraction tracking vehicle and a gas protection cover. And the welding device is hoisted above the tank body through the hoisting device. The first magnetic attraction tracking vehicle is detachably connected with the welding device, and the welding device moves to drive the first magnetic attraction tracking vehicle to move. Magnetic attraction force is generated between the second magnetic attraction tracking vehicle and the first magnetic attraction tracking vehicle. And the gas protection cover is arranged on the inner side of the tank body and is opposite to the welding device. The gas protection cover is fixedly arranged on the second magnetic attraction tracking vehicle and synchronously moves along with the second magnetic attraction tracking vehicle, an opening of the gas protection cover corresponds to a welding seam, and inert gas is provided for the welding seam to protect the welding seam. The device cannot fall off from the cylinder body plate due to power failure, gas stop and the like, and has higher safety and working reliability.

Description

Technical Field

[0001] The invention relates to the field of storage tanks, and in particular to a tank body welding system and a tank body welding method. Background Art

[0002] Storage tanks are special equipment. Due to their large size and high requirements, their manufacturing difficulty is relatively high. For stainless steel tank welding, including circumferential weld welding, plasma arc and tungsten inert gas welding are usually used. In this welding method, welders weld the weld on the outside of the tank, and the weld on the inside of the tank needs to be protected by inert gas at the same time, otherwise the weld is very easy to oxidize.

[0003] In traditional technology, operators need to use a support structure inside the tank to lift the gas shield to protect the weld. This solution is cumbersome to install and takes a long time to operate. The special structure needs to be lifted manually, which results in low efficiency of tank welding. In addition, since the length of the tank can reach more than ten meters and the height is nearly 7-8 meters, there are great safety hazards when welders move around the tank to weld, and they are prone to fall from height. Summary of the invention

[0004] The object of the present invention is to provide a tank welding system and a tank welding method which can improve the tank welding efficiency and have higher safety.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a tank welding system, which is used for welding the weld of the tank and comprises:

[0007] A welding device is hoisted above the tank body by a hoisting device and is aligned with the weld of the tank body. The tank body rotates along the axial direction, and the welding device remains aligned with the weld of the tank body.

[0008] A first magnetic tracking vehicle is movable and arranged outside the tank body, the first magnetic tracking vehicle is detachably connected to the welding device, and the movement of the welding device drives the first magnetic tracking vehicle to move;

[0009] A second magnetic tracking vehicle is movable and arranged inside the tank body, and a magnetic attraction force is generated between the second magnetic tracking vehicle and the first magnetic tracking vehicle, so that the second magnetic tracking vehicle moves following the first magnetic tracking vehicle;

[0010] A gas protective cover is arranged inside the tank body and opposite to the welding device. The protective cover is fixedly arranged on the second magnetic tracking vehicle and moves synchronously with the second magnetic tracking vehicle. The opening of the gas protective cover corresponds to the weld and provides inert gas protection for the weld.

[0011] In one embodiment, the first magnetic tracking vehicle and the second magnetic tracking vehicle include:

[0012] Frame;

[0013] At least three wheels, the axles of the at least three wheels are connected to the frame, the connecting lines of the at least three wheels form a polygon, the wheels are in contact with the surface of the tank body and can move along the surface of the tank body;

[0014] A magnetic member connected to the frame;

[0015] A connecting frame, the connecting frame is arranged on the frame and extends to one side of the wheel rolling surface;

[0016] A locking piece runs through the connecting frame, the locking piece is movably connected to the connecting frame, and the locking piece can move relative to the connecting frame toward the rolling surface of the wheel and abut against the rolling surface of the wheel, thereby limiting the movement of the wheel.

[0017] In one embodiment, the first magnetic tracking vehicle and the second magnetic tracking vehicle both further include a demagnetization box;

[0018] The degaussing box is arranged on the frame, and the magnetic member is fixed in the degaussing box;

[0019] The bottom of the degaussing box is provided with an opening so that the magnetic field of the magnetic member can be transmitted out from the opening.

[0020] In one embodiment, the first magnetic tracking vehicle further includes a traction assembly;

[0021] The traction assembly is connected to the frame of the first magnetic tracking vehicle, and extends from the frame of the first magnetic tracking vehicle toward a side away from the second magnetic tracking vehicle;

[0022] The traction assembly is used to be connected with the welding device.

[0023] In one embodiment, the traction assembly includes a connecting plate, a buckle plate, a traction plate, and an elastic member;

[0024] One end of the connecting plate is fixedly connected to the frame of the first magnetic tracking vehicle and extends toward a side away from the wheel of the first magnetic tracking vehicle;

[0025] The buckle plate is provided with a connection hole for the connection plate to pass through, and the connection plate passes through the connection hole to be connected with the buckle plate;

[0026] The buckle plate is connected to one end of the traction plate through an elastic member, and the other end of the traction plate is connected to the welding device.

[0027] In one embodiment, the welding device includes a first arc welding gun and a second arc welding gun, the first arc welding gun and the second arc welding gun are arranged in sequence along the arc weld, and the length direction of the gas protection cover corresponds to the extension direction of the arc weld and covers the welding points of the first arc welding gun and the second arc welding gun.

[0028] In one embodiment, the welding devices include two devices, which are respectively located above two ends of the tank body and correspond to the welds at the two ends of the tank body.

[0029] In one embodiment, the second magnetic tracking vehicle further includes a protective cover connecting bracket;

[0030] The protective cover connecting bracket is connected between the frame of the second magnetic tracking vehicle and the gas protective cover, so that the gas protective cover and the second magnetic tracking vehicle move synchronously.

[0031] In one embodiment, the gas protection cover is made of titanium alloy.

[0032] A tank welding method, applied to the above tank welding system, comprises the following steps:

[0033] Install the first magnetic tracking vehicle and the second magnetic tracking vehicle on the bottom of the tank body for opposite suction;

[0034] Locking the locking member so that the locking member fastens the first magnetic tracking vehicle;

[0035] The rotation of the roller frame drives the tank body to rotate, so that the first magnetic tracking vehicle and the second magnetic tracking vehicle rotate to the top of the tank body, and the welding device is aligned with the weld;

[0036] The welding device is fixedly connected to the first magnetic tracking vehicle, and the locking piece is loosened;

[0037] The roller frame drives the tank body to rotate, and the rotation of the tank body drives the first magnetic tracking vehicle to move, and the first magnetic tracking vehicle drives the welding device to weld along the weld, and the second magnetic tracking vehicle drives the gas protection cover to move with the first magnetic tracking vehicle to perform gas protection on the weld;

[0038] After welding is completed, the locking piece is locked, and the welding device is separated from the first magnetic tracking vehicle;

[0039] The roller frame is rotated to rotate the first magnetic tracking vehicle and the second magnetic tracking vehicle to the bottom of the tank body, and the first magnetic tracking vehicle and the second magnetic tracking vehicle are disassembled.

[0040] In the technical solution of the present invention, the roller frame can drive the tank body to move, so the tank body welding system can be used to weld the weld of the tank body. Since the welding device is hoisted above the tank body, the welding point of the tank body is always located above the tank body. In the solution provided by the present application, when the weld rotates relative to the first magnetic tracking vehicle, the first magnetic tracking vehicle moves along the outside of the storage tank. The first magnetic tracking vehicle and the second magnetic tracking vehicle use strong magnetic attraction to maintain a stable relative position. The first magnetic tracking vehicle drives the second magnetic tracking vehicle and the gas protection cover to move synchronously. In addition, when welding the tank body, the gas protection cover is on the inside of the tank body, and can simultaneously perform inert gas protection on the weld to avoid weld oxidation.

[0041] First of all, the technical solution of the present invention relies on magnetic attraction to achieve the purpose of synchronous movement of the welding device and the gas protection hood. The gas protection hood does not need to be equipped with an additional power source and related electrical equipment, which effectively reduces the installation complexity of the gas protection device and eliminates the hidden dangers affected by the power source. And the gas protection device is through the action of the magnetic field, so it has high reliability and will not fall off the cylinder plate due to power outages, gas outages, etc., so the gas protection device of the present invention has high working reliability. Secondly, due to the strong magnetic attraction between the first magnetic tracking vehicle and the second magnetic tracking vehicle, the linear speed synchronization between the two magnetic tracking vehicles can be better guaranteed during the operation of the gas protection device, so that the gas protection hood can reliably perform gas protection on the weld. Finally, the gas protection device of the present invention is small in size, light in weight, and easy to install. Even if the second magnetic tracking vehicle and the gas protection hood are located on the top of the tank body, there is no need for personnel to lift them. Only one person is needed to complete the installation, and the installation efficiency is high. According to actual application tests, it takes two people 1155 seconds to install a traditional gas protection device with a power source; while it takes only one person 240 seconds to install the gas protection device of the present invention, and the installation efficiency is improved by 80%.

[0042] Moreover, in the above tank welding method, the operator can install and disassemble the first magnetic tracking vehicle and the second magnetic tracking vehicle at the bottom of the tank. This operation can avoid the operator from working at high altitude, improve the convenience of operation, and has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a working state diagram of the tank body welding device of the present invention when welding the tank body cylinder plate;

[0044] Figure 2 yes Figure 1 It is a side view;

[0045] Figure 3 yes Figure 1 Enlarged view of the gas protection device;

[0046] Figure 4 yes Figure 3 A front view of a partial structure of the first magnetic tracking vehicle;

[0047] Figure 5 yes Figure 4 It is a bottom view;

[0048] Figure 6 yes Figure 5 Side view of

[0049] Figure 7 yes Figure 3 A front view of a portion of the structure of the middle traction assembly;

[0050] Figure 8 yes Figure 7 A top view of the middle locking rod and the buckle connecting plate;

[0051] Fig. 9 is a front view of the gas shield;

[0052] Fig.10 yes Fig. 9 Side view of

[0053] Fig.11 It is a schematic flow chart of the tank body welding method of the present invention.

[0054] The following are the descriptions of the reference numerals:

[0055] 1. Tank body; 11. Cylinder plate; 12. End cap;

[0056] 2. Gas protection device; 21. First magnetic tracking vehicle; 22. Second magnetic tracking vehicle; 23. Gas protection cover; 231. Ventilation pipe; 232. Sieve-like partition; 211. Vehicle frame; 212. Wheel; 213. Magnetic part; 221. Protection cover connecting bracket;

[0057] 214, degaussing box; 2141, inner degaussing cover; 2142, outer degaussing cover; 2143, spacer;

[0058] 215, connecting frame; 216, locking member;

[0059] 217, traction assembly; 2171, connecting plate; 2172, buckle plate; 21721, connecting hole; 2173, traction plate; 2174, hinge; 2175, fixing bracket; 2176, locking rod;

[0060] 3. Welding device; 31. Welding gun; 31a. Plasma arc welding gun; 31b. TIG welding gun;

[0061] 4. Gantry;

[0062] 5. Roller frame; 51. Roller; 52. Limiting structure. DETAILED DESCRIPTION

[0063] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0064] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0065] See also Figures 1 to 3 The embodiment of the present invention provides a tank welding system. The tank welding system includes a roller frame 5, a welding device 3 and a gas protection device for welding the tank cylinder plate. A tank welding system is used for welding the weld of the tank. The weld includes a circular weld surrounding the tank, a longitudinal weld and an arc weld, etc. In this embodiment, the weld is described by taking a circular weld as an example.

[0066] The tank body 1 can be a liquefied natural gas storage tank. The tank body 1 includes a cylinder and a head provided at both ends of the cylinder. The cylinder is formed by splicing multiple sections of cylinder plates 11. Generally, the perimeter of the cylinder plate 11 is the welding edge. The perimeter edges of two adjacent cylinder plates 11 are welded by a welding gun 31 to form an annular weld. While welding, the weld that has just been welded needs to be protected by an inert gas to prevent the weld from being oxidized. The material of the cylinder plate 11 can be stainless steel, such as austenitic stainless steel.

[0067] The driving structure is used to drive the tank body 1 to rotate along its axial direction. Specifically in the present embodiment, the driving structure can be a roller frame 5. The roller frame 5 is arranged at the bottom of the tank body. The roller frame 5 is used to support the tank body and can drive the tank body to rotate around the axial direction. The roller frame 5 includes a roller 51 and a limiting structure 52. The roller 51 is used to contact the outer wall of the tank body 1, and the friction between the roller 51 and the tank body drives the tank body 1 to rotate. The limiting structure 52 is used to limit the head 12 of the tank body 1 to ensure that the tank body 1 can stably rotate on the roller frame 5.

[0068] In other embodiments, the roller frame 5 may also be other driving structures. For example, the driving structure may be connected to the sealing head 12 of the tank body 1 through a connecting structure such as a clamp, and the tank body 1 may also be rotated along its axial direction by rotating the sealing head 12.

[0069] The welding device 3 is hoisted above the tank body 1 by the hoisting device 4 and is aligned with the weld of the tank body 1. The hoisting device 4 may be a gantry. The gantry is provided with a moving device, and the welding device 3 is hoisted by the gantry and can move above the tank body. The position of the welding device 3 is adjusted so that the welding device 3 is aligned with the weld, and the roller frame 5 rotates the tank body 1 so that the welding device 3 remains aligned with the annular weld of the tank body 1.

[0070] The welding device 3 includes a welding gun 31. The welding gun 31 of the welding device 3 includes a first arc welding gun and a second arc welding gun. The first arc welding gun and the second arc welding gun can be a plasma arc welding gun 31a and a tungsten inert gas welding gun 31b. During welding, the plasma arc welding gun 31a and the tungsten inert gas welding gun 31b are sequentially arranged along the same arc weld of the cylinder plate 11, so as to sequentially perform plasma arc welding and tungsten inert gas welding on the same arc weld. The specific types of the first arc welding gun and the second arc welding gun are not limited here, as long as the welding requirements are met.

[0071] Specifically, in this embodiment, the gas protection device for tank body cylinder plate welding includes a first magnetic attraction tracking vehicle 21 , a second magnetic attraction tracking vehicle 22 and a gas protection cover 23 .

[0072] The first magnetic tracking vehicle 21 is movable and arranged outside the tank body 1. The first magnetic tracking vehicle 21 is connected to the welding device 3, and the movement of the welding device 3 drives the first magnetic tracking vehicle 21 to move.

[0073] The second magnetic tracking vehicle 22 is movable and arranged inside the tank body 1. A magnetic attraction force is generated between the second magnetic tracking vehicle 22 and the first magnetic tracking vehicle 21, and the second magnetic tracking vehicle 22 moves following the first magnetic tracking vehicle 21. The first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 have magnetic forces in opposite directions to generate a magnetic attraction force, so that the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 move synchronously along the plate surface of the cylinder plate 11 due to the magnetic attraction force.

[0074] See also Figure 3 In this embodiment, the second magnetic tracking vehicle 22 further includes a protective cover connecting bracket 221. The protective cover connecting bracket 221 is connected between the frame 211 of the second magnetic tracking vehicle 22 and the gas protective cover 23 to enable the gas protective cover 23 and the second magnetic tracking vehicle 22 to move synchronously. The protective cover connecting bracket 221 can be connected by two support rods through a fixing member, and the two support rods are 90 degrees to each other.

[0075] The gas protection hood 23 is arranged on the inner side of the tank body 1 and is arranged opposite to the welding device 3. The gas protection hood 23 is fixedly arranged on the second magnetic tracking vehicle 22 and moves synchronously with the second magnetic tracking vehicle 22. The opening of the gas protection hood 23 corresponds to the weld and provides inert gas protection for the weld.

[0076] Specifically, the gas shield 23 is made of titanium alloy, which can greatly reduce the weight of the gas protection device 2, and has high strength and high temperature resistance. Since the gas shield 23 made of titanium alloy is light in weight, the length of the shield can be lengthened to provide better gas protection for the weld.

[0077] The length of the gas shield 23 at least covers the position welded by the welding gun 31 of the welding device 3. Specifically, the length direction of the gas shield 23 corresponds to the direction in which the arc weld extends, and covers the welding positions of the plasma arc welding gun 31a and the tungsten inert gas welding gun 31b at the same time, so as to provide gas protection for the welds welded by the plasma arc welding gun 31a and the tungsten inert gas welding gun 31b at the same time. That is, the welding gun 31 of the welding device 3 moves synchronously with the gas shield 23.

[0078] Here, the shape of the tank body 1 is used as a reference. The outer surface of the tank body 1 is the front of the cylinder plate 11, and the inner surface of the tank body 1 is the back of the cylinder plate 11. When welding, the welding device 3 is suspended on the gantry 4, and the welding gun 31 of the welding device 3 welds the arc welds of two adjacent cylinder plates 11 from the front of the cylinder plate 11. The first magnetic tracking vehicle 21 is connected to the welding device 3 and is located together with the welding gun 31 on the front side of the cylinder plate 11; the first magnetic tracking vehicle 21 can move along the front of the cylinder plate 11, so the welding gun 31 moves synchronously with the first magnetic tracking vehicle 21.

[0079] The gas shield 23 is connected to a gas source, and the gas shield 23 is fixedly connected to the second magnetic tracking vehicle 22, and they are located together on the back of the arc weld of the cylinder plate 11. The gas shield 23 is arranged opposite to the welding gun 31, and the second magnetic tracking vehicle 22 is arranged opposite to the first magnetic tracking vehicle 21. The second magnetic tracking vehicle 22 and the first magnetic tracking vehicle 21 have opposite magnetic properties, so a magnetic attraction force is generated between the two. Under the action of the magnetic attraction force, when the first magnetic tracking vehicle 21 moves relative to the cylinder plate 11, the second magnetic tracking vehicle 22 will also move relative to the cylinder plate 11 to maintain the relative position with the first magnetic tracking vehicle 21. Then the gas shield 23 will maintain the relative position with the welding gun 31. Therefore, when the welding gun 31 is welding the cylinder plate 11, even if it is in a relative position with the cylinder plate 11, the gas protection device 2 can maintain the relative position relationship with the welding gun 31, so as to continue to synchronously perform gas protection for the weld welded by the welding gun 31.

[0080] In the technical solution of the present invention, the welding device 3 is connected to the first magnetic tracking vehicle 21 on the front side of the cylinder plate 11, and the gas protection cover 23 is connected to the second magnetic tracking vehicle 22 on the back side of the cylinder plate 11. Therefore, when the welding gun 31 of the welding device 3 welds the arc weld of the cylinder plate 11, the first magnetic tracking vehicle 21 will always follow the position of the welding gun 31, and the second magnetic tracking vehicle 22 will follow the first magnetic tracking vehicle 21 for synchronous movement by using strong magnetic attraction, so that the gas protection cover 23 will maintain the relative position with the welding gun 31 unchanged, thereby performing gas protection on the weld after welding by the welding gun 31 on the back side of the cylinder plate 11. First, the technical solution of the present invention relies on magnetic attraction to achieve the purpose of synchronizing the gas protection cover 23 with the welding gun 31. There is no need to configure an additional power source and related electrical equipment, which effectively reduces the installation complexity of the gas protection device 2 and eliminates the hidden dangers affected by the power source; and the gas protection device 2 is through the action of the magnetic field, so it has high reliability and will not fall off the cylinder plate 11 due to power outages, gas outages, etc., so the gas protection device 2 of the present invention has high working reliability. Secondly, due to the strong magnetic attraction between the first magnetic attraction tracking vehicle 21 and the second magnetic attraction tracking vehicle 22, the linear speed synchronization between the two magnetic attraction tracking vehicles can be better guaranteed during the operation of the gas protection device 2, so that the gas protection cover 23 can reliably perform gas protection on the weld. Finally, the gas protection device 2 of the present invention is small in size, light in weight, easy to install, and only one person is required to complete the installation, and the installation efficiency is high. In actual application tests, it takes 2 people 1155 seconds to install the original gas protection device with a power source; while it only takes 1 person 240 seconds to install the gas protection device 2 of the present invention, and the installation efficiency is increased by 80%.

[0081] By providing a first magnetic tracking vehicle 21 connected to the welding device 3, a gas shield 23 provided on the back of the arc weld of the cylinder plate 11, and a second magnetic tracking vehicle 22 connected to the gas shield 23 and located on the same side of the cylinder plate 11 as the gas shield 23. The first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 have magnetism in opposite directions to generate magnetic attraction, so that the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 move synchronously along the plate surface of the cylinder plate 11 due to the magnetic attraction, and then the welding gun 31 of the welding device 3 moves synchronously with the gas shield 23.

[0082] The weld seams of the tank body 1 include circumferential weld seams and longitudinal weld seams. The gas protection device 2 of this embodiment can provide gas protection when welding the circumferential weld seams, and can also provide gas protection when welding the longitudinal weld seams.

[0083] When welding the circumferential weld, the welding device 3 and the first magnetic tracking vehicle 21 are suspended on the gantry 4, and the tank body 1 is placed on the roller frame 5, which drives the tank body 1 to rotate circumferentially. Therefore, during welding, the tank body 1 rotates, and the welding device 3 and the first magnetic tracking vehicle 21 remain in position; the first magnetic tracking vehicle 21 moves relative to the front of the tank body 1. Similarly, the position of the second magnetic tracking vehicle 22 remains stationary, but the second magnetic tracking vehicle 22 moves relative to the back of the cylinder plate 11.

[0084] When welding the longitudinal weld, the first magnetic tracking vehicle 21 may also include a driving mechanism; the driving mechanism is connected to the frame 211 of the first magnetic tracking vehicle 21 to drive the wheels 212 of the first magnetic tracking vehicle 21 to move. At this time, the first magnetic tracking vehicle 21 is in active motion, and the first magnetic tracking vehicle 21 drives the welding device 3 to move together, while attracting the second magnetic tracking vehicle 22, driving the gas protection cover 23 to move synchronously; thereby completing the welding of the longitudinal weld. Specifically, the driving mechanism may be a motor to drive the first magnetic tracking vehicle 21 to move through the motor, and of course, the first magnetic tracking vehicle 21 may also be driven pneumatically to move. The specific structures of the existing motor drive and pneumatic methods can be applied to this embodiment.

[0085] The first magnetic tracking vehicle 21 includes a first vehicle body and a traction assembly 217 connected to the first vehicle body; the second magnetic tracking vehicle 22 includes a second vehicle body and a protective cover bracket connected to the second vehicle body. The structures of the first vehicle body and the second vehicle body can be the same or different.

[0086] In this embodiment, for the convenience of generation, the first vehicle body and the second vehicle body are set to have the same structure, but of course the sizes can be different. Here, the structure of the first vehicle body is taken as an example for explanation. In one embodiment, the first vehicle body includes a frame 211 and at least three wheels 212; wherein the frame 211 can be ferromagnetic; specifically, it can be made of a permanent magnet material.

[0087] See also Figures 4 to 6 The first vehicle body in this embodiment includes a vehicle frame 211, at least three wheels 212, a degaussing box 214 and a magnetic member 213. The magnetic member 213 is used to generate magnetism. The degaussing box 214 is used to accommodate the magnetic member 213 and shield unnecessary magnetic fields, so as to reduce the influence on the welding device 3 while not affecting the magnetic attraction generated by the magnetic member 213 of the first vehicle body and the magnetic member 213 of the second vehicle body.

[0088] Specifically, the wheels 212 may be universal wheels or one-way wheels, and the shafts of at least three wheels 212 are connected to the frame 211, and the connecting lines of at least three wheels 212 form a polygon. The degaussing box 214 is disposed on the frame 211, and the magnetic member 213 is fixed in the degaussing box 214; the bottom of the degaussing box 214 has an opening so that the magnetic field of the magnetic member 213 can be transmitted from the opening.

[0089] When there are three wheels 212, the connecting line of the three wheels 212 is a triangle. In this embodiment, the first vehicle body has four wheels 212, and the four wheels 212 are divided into two groups and arranged front and back. The orientation of the first vehicle body placed on the cylinder plate 11 needs to make the rolling direction of the wheels 212 of the first vehicle body correspond to the welding direction of the welding gun 31, so that during welding, the wheels 212 can roll along the welding direction. The axles of each group of wheels 212 are connected together by connecting rods so that the two wheels 212 of each group move synchronously, and the two connecting rods are arranged roughly in parallel.

[0090] The degaussing box 214 is disposed between the two connecting rods. The degaussing box 214 can be fixedly connected to the two connecting rods by welding, or can be detachably connected to the connecting rods by a clamping structure or bolt connection.

[0091] A fixing member is provided in the degaussing box 214, and the fixing member can be a nut. A through hole is provided on the magnetic member 213, and then a screw is passed through the through hole and the nut in sequence to fix the magnetic member 213 in the degaussing box 214. Therefore, even if the bottom of the degaussing box 214 is open, the magnetic member 213 will not fall out of the degaussing box 214.

[0092] Here, the structure of the trolley itself is used as a reference, and the side where the wheel 212 of the trolley is located is used as the bottom of the trolley. The bottom of the demagnetization box 214 is oriented in the same direction as the bottom of the trolley. An opening is provided at the bottom of the demagnetization box 214 so that the magnetic field of the magnetic part 213 can be transmitted from the opening. With reference to the welding orientation of the tank body 1, the first magnetic tracking vehicle 21 located on the front side of the cylinder plate 11 is located above the cylinder plate 11, and at this time, the opening of the demagnetization box 214 of the first magnetic tracking vehicle 21 is facing downward. The second magnetic tracking vehicle 22 located on the back side of the cylinder plate 11 is located below the cylinder plate 11, and at this time, the opening of the demagnetization box 214 of the second magnetic tracking vehicle 22 is facing upward. Therefore, there is only one layer of cylinder plate 11 between the opening of the demagnetization box 214 of the first magnetic tracking vehicle 21 and the opening of the second magnetic tracking vehicle 22. Therefore, the existence of the demagnetization box 214 will not affect the magnetic attraction force generated between the magnetic part 213 of the first magnetic tracking vehicle 21 and the magnetic part 213 of the second magnetic tracking vehicle 22.

[0093] In this embodiment, the demagnetization box 214 has two layers, namely an inner demagnetization cover 2141 and an outer demagnetization cover 2142. A spacer ring 2143 is provided between the inner demagnetization cover 2141 and the outer demagnetization cover 2142 to ensure a certain distance between the inner demagnetization cover 2141 and the outer demagnetization cover 2142 to reduce the occurrence of magnetic conduction. Similarly, a spacer ring 2143 is also provided between the inner demagnetization cover 2141 and the magnetic part 213.

[0094] In this embodiment, the magnetic member 213 can be a permanent magnet, such as a strong neodymium iron boron magnet. The S pole of the magnet of the first magnetic tracking vehicle 21 faces the cylinder plate 11, and the N pole of the magnet of the second magnetic tracking vehicle 22 faces the cylinder plate 11. Therefore, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 are attracted to each other across the cylinder plate 11. In another embodiment, the magnetic member 213 is an electromagnet, and a battery is provided in the demagnetization box 214, or the electromagnet is directly powered to generate a magnetic field. In this embodiment, the magnetic field of the electromagnet can be controlled by controlling the current in the electromagnet, thereby controlling the magnetic attraction between the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22.

[0095] Furthermore, the first vehicle body also includes a connecting frame 215, and a locking member 216 that passes through the connecting frame 215. The connecting frame 215 is movably connected to the frame 211, and the connecting frame 215 extends to one side of the rolling surface of the wheel 212. The locking member 216 can move relative to the connecting frame 215 toward the rolling surface of the wheel 212, and abut against the rolling surface of the wheel 212, thereby limiting the movement of the wheel 212. Specifically, in this embodiment, the wheel 212 is an anti-skid rubber-coated wheel, so it has a certain elasticity, and the locking member 216 can be a locking screw. The locking screw is rotated to move relative to the connecting frame 215 toward the rolling surface of the wheel 212 until it abuts against the rolling surface of the wheel 212. The locking member 216 can stably press the wheel 212 on the outer surface of the tank body 1 through the pressing effect of the wheel 212, thereby preventing the wheel 212 from rotating and the first magnetic tracking vehicle 21 from moving.

[0096] Specifically in the application, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 need to be installed opposite to each other at a convenient position, and then the wheel 212 of the first magnetic tracking vehicle 21 is fastened by the locking piece 216 to prevent the first magnetic tracking vehicle 21 from sliding during the ascending stage. The cylinder plate 11 is separated between the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22, and rotates with the tank body 1 to the position of the welding gun 31. The position of the welding gun 31 can be directly above the tank body 1. At this time, after the traction plate 2173 is connected and fixed to the welding device 3 or the gantry 4, the locking piece 216 on the first magnetic tracking vehicle 21 is released. At this time, the cylinder plate 11 can rotate between the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22.

[0097] It needs to be explained again that the embodiments corresponding to the first vehicle body in the above embodiments are all applicable to the second vehicle body and will not be described in detail here.

[0098] When using the above tank welding device, the corresponding tank welding method includes:

[0099] See also Fig.11 , step S11, the first magnetic tracking vehicle and the second magnetic tracking vehicle are installed opposite to each other at the bottom of the tank body.

[0100] When the tank body 1 is to be welded, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 need to be installed. The operator aligns and installs the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 on both sides of the tank body 1 at the bottom of the tank body 1.

[0101] Step S12, locking the locking member so that the locking member fastens the first magnetic tracking vehicle.

[0102] The locking member 216 is screwed on to move the locking member 216 toward the rolling surface of the wheel 212 until it abuts against the rolling surface of the wheel 212 , thereby tightening and limiting the first magnetic tracking vehicle 21 .

[0103] To enhance safety, the second magnetic tracking vehicle 22 may also be locked and limited by a locking member.

[0104] Step S13, the roller frame rotates to drive the tank body to rotate, so that the first magnetic tracking vehicle and the second magnetic tracking vehicle rotate to the top of the tank body, and the welding device is aligned with the annular weld.

[0105] Step S14, fixedly connecting the welding device to the first magnetic tracking vehicle, and releasing the locking piece.

[0106] The welding device 3 is fixedly connected to the connecting frame 215 through the traction assembly 217, thereby achieving a fixed connection between the welding device 3 and the first magnetic tracking vehicle 21.

[0107] The locking member 216 is rotated in the reverse direction to move the locking member 216 away from the rolling surface of the wheel 212 until it is separated from the rolling surface of the wheel 212, thereby releasing the limit on the first magnetic tracking vehicle 21 and / or the second magnetic tracking vehicle 22, allowing them to move.

[0108] Step S15, the roller frame drives the tank body to rotate, the rotation of the tank body drives the first magnetic tracking vehicle to move, the first magnetic tracking vehicle drives the welding device to weld along the annular weld, and the second magnetic tracking vehicle drives the gas protection cover to move with the first magnetic tracking vehicle to perform gas protection on the annular weld.

[0109] Step S16, after the welding is completed, the locking piece is locked and the welding device is separated from the first magnetic tracking vehicle.

[0110] Tighten the locking member 216 to lock the first magnetic tracking vehicle 21 to the side wall of the tank body 11, so as to avoid the risk of the first magnetic tracking vehicle 21 moving, falling or sliding down the slope due to the gravity of the first magnetic tracking vehicle 21 during the rotation of the tank body.

[0111] To enhance safety, the second magnetic tracking vehicle 22 may also be locked and limited by a locking member.

[0112] Step S17, rotating the roller frame to rotate the first magnetic tracking vehicle and the second magnetic tracking vehicle to the bottom of the tank body, and disassembling the first magnetic tracking vehicle and the second magnetic tracking vehicle.

[0113] First, the locking piece 216 is unlocked, and then the magnetic attraction between the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 is destroyed, so that the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 are separated from each other, thereby realizing the disassembly of the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22.

[0114] When preparing for welding the tank body 1, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 are installed. When the tank body 1 rotates with the roller frame 5 and the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 move upward, the locking member 216 limits the wheel 212 of the first magnetic tracking vehicle 21 to prevent the wheel 212 from rolling during the rotation of the tank body 1, thereby driving the first magnetic tracking vehicle 21 to move. Since the first magnetic tracking vehicle 21 has not yet been connected to the welding device 3, the first magnetic tracking vehicle 21 is very prone to the risk of falling from a high altitude, and it is bound to cause the second magnetic tracking vehicle 22 to fall from a high altitude, which not only affects the safe construction, but also affects the overall welding process.

[0115] Moreover, when the welding of the tank body 1 is completed, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 need to be disassembled. First, separate the first magnetic tracking vehicle 21 from the welding device 3. Then, limit the wheel 212 of the first magnetic tracking vehicle 21 by tightening the locking member 216 to prevent the wheel 212 from rolling during the rotation of the tank body 1. Then, by rotating the roller frame 5, the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 move to the bottom of the tank body 1. Finally, the operator disassembles the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22. Due to the low operating height, the entire operation process is more convenient, avoiding high-altitude operations, and improving safety and operating efficiency.

[0116] Therefore, in the above-mentioned tank welding method, the operator can install and disassemble the first magnetic tracking vehicle 21 and the second magnetic tracking vehicle 22 at the bottom of the tank body. This operation can avoid the operator from working at high altitude, improve the convenience of operation, and have higher safety. In addition, the operator can lock the first magnetic tracking vehicle 21 through the locking member to avoid problems such as slipping. In addition, in order to further improve the safety of the tank welding system, the operator can also use the locking member to lock and unlock the second magnetic tracking vehicle 22, thereby avoiding the second magnetic tracking vehicle 22 from being stably fixed on the tank body during the non-welding process, preventing falling objects from high altitude, and improving safety.

[0117] See also Figure 7 and Figure 8 In this embodiment, the first magnetic tracking vehicle 21 further includes a traction assembly 217, which is connected to the frame 211 of the first magnetic tracking vehicle 21 and extends from the frame 211 of the first magnetic tracking vehicle 21 toward a side away from the second magnetic tracking vehicle 22; the traction assembly 217 is used to connect to the welding device 3. In one embodiment, the traction assembly 217 can be connected to the gantry 4.

[0118] In addition, the welding device 3 is installed on the traction assembly 217. Specifically, the traction assembly 217 includes a connecting plate 2171, a buckle plate 2172, a locking rod 2176, a traction plate 2173, an elastic member, and a fixed bracket 2175. One end of the connecting plate 2171 is fixedly connected to the frame 211 of the first magnetic tracking vehicle 21, and extends toward the side away from the wheel 212 of the first magnetic tracking vehicle 21. The buckle plate 2172 is provided with a connecting hole 21721 for the connecting plate 2171 to pass through, and the connecting plate 2171 passes through the connecting hole 21721 to be connected with the buckle plate 2172, so as to limit the movement of the trolley in the rotation direction of the tank body 1. The buckle plate 2172 is connected to one end of the traction plate 2173 through an elastic member, and the other end of the traction plate 2173 is connected to the welding device 3 or the gantry 4 through the fixed bracket 2175.

[0119] Specifically, the connecting plate 2171 is fixedly connected to the frame 211 of the first vehicle body, and can be connected by welding or screws. The shape of the connecting hole 21721 is adapted to the shape of the connecting plate 2171, and the width of the connecting hole 21721 can be roughly equal to the thickness of the connecting plate 2171. In this embodiment, in order to facilitate the connecting plate 2171 to pass through the connecting hole 21721, the width of the connecting hole 21721 is set to be greater than the thickness of the connecting plate 2171, and then a locking rod 2176 that can rotate relative to the locking plate 2172 is set on the buckle plate 2172. The locking rod 2176 rotates to extend into the gap between the connecting hole 21721 and the connecting plate 2171, thereby keeping the connecting plate 2171 and the buckle plate 2172 from shaking, forming a more stable connection.

[0120] The elastic member can be a spring. In the present embodiment, the elastic member is a hinge 2174. Two hinges 2174 can be provided, and the first hinge 2174 is connected between the traction plate 2173 and the buckle plate 2172. The traction plate 2173 is divided into two sections, which are connected by the second hinge 2174. The setting of the hinge 2174 can flexibly adjust the length of the hinge 2174 and the traction plate 2173. The height of the first magnetic tracking vehicle 21 can effectively avoid the uneven surface of the cylinder plate 11, or when the size of the tank body 1 is different and the distance between the gantry 4 changes, the first magnetic tracking vehicle 21 connected between the tank body 1 and the gantry 4 is squeezed, or the first magnetic tracking vehicle 21 is separated from the surface of the cylinder plate 11, thereby improving the working safety of the gas protection device 2 and reducing the requirements for the flatness of the cylinder plate 11.

[0121] See also Fig. 9 and Fig.10 . Further, a vent pipe 231 is provided at the bottom of the gas protection cover 23, and the vent pipe 231 is connected to a gas source, which may be argon gas. A sieve-like baffle 232 for preventing turbulence may also be provided in the gas protection cover 23, and the extending direction of the sieve-like baffle 232 is substantially perpendicular to the flow direction of the gas flow. The material of the sieve-like baffle 232 may be copper.

[0122] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A tank welding system, used for welding the weld of a tank, characterized in that: include: A welding device is hoisted above the tank body by a hoisting device and is aligned with the weld of the tank body. The tank body rotates along the axial direction, and the welding device remains aligned with the weld on the top of the tank body. A first magnetic tracking vehicle is movable and arranged outside the tank body, the first magnetic tracking vehicle is detachably connected to the welding device, and the movement of the welding device drives the first magnetic tracking vehicle to move; A second magnetic tracking vehicle is movable and arranged inside the tank body, and a magnetic attraction force is generated between the second magnetic tracking vehicle and the first magnetic tracking vehicle, so that the second magnetic tracking vehicle moves following the first magnetic tracking vehicle; A gas protective cover is arranged inside the tank body and opposite to the welding device. The protective cover is fixedly arranged on the second magnetic tracking vehicle and moves synchronously with the second magnetic tracking vehicle. The opening of the gas protective cover corresponds to the weld and provides inert gas protection for the weld.

2. The tank welding system according to claim 1, characterized in that: The first magnetic tracking vehicle and the second magnetic tracking vehicle include: Frame; At least three wheels, the axles of the at least three wheels are connected to the frame, the connecting lines of the at least three wheels form a polygon, the wheels are in contact with the surface of the tank body and can move along the surface of the tank body; A magnetic member connected to the frame; A connecting frame, the connecting frame is arranged on the frame and extends to one side of the wheel rolling surface; A locking piece runs through the connecting frame, the locking piece is movably connected to the connecting frame, and the locking piece can move relative to the connecting frame toward the rolling surface of the wheel and abut against the rolling surface of the wheel, thereby limiting the movement of the wheel.

3. The tank welding system according to claim 2, characterized in that: The first magnetic tracking vehicle and the second magnetic tracking vehicle both further include a demagnetization box; The degaussing box is arranged on the frame, and the magnetic member is fixed in the degaussing box; The bottom of the degaussing box is provided with an opening so that the magnetic field of the magnetic member can be transmitted out from the opening.

4. The tank welding system according to claim 2, characterized in that: The first magnetic tracking vehicle also includes a traction assembly; The traction assembly is connected to the frame of the first magnetic tracking vehicle, and extends from the frame of the first magnetic tracking vehicle toward a side away from the second magnetic tracking vehicle; The traction assembly is used to be connected with the welding device.

5. The tank welding system according to claim 4, characterized in that: The traction assembly includes a connecting plate, a buckle plate, a traction plate, and an elastic member; One end of the connecting plate is fixedly connected to the frame of the first magnetic tracking vehicle and extends toward a side away from the wheel of the first magnetic tracking vehicle; The buckle plate is provided with a connection hole for the connection plate to pass through, and the connection plate passes through the connection hole to be connected with the buckle plate; The buckle plate is connected to one end of the traction plate through an elastic member, and the other end of the traction plate is connected to the welding device.

6. The tank welding system according to claim 1, characterized in that: The welding device includes a first arc welding gun and a second arc welding gun, the first arc welding gun and the second arc welding gun are arranged in sequence along the arc weld, the length direction of the gas protection cover corresponds to the extension direction of the arc weld, and covers the welding points of the first arc welding gun and the second arc welding gun.

7. The tank welding system according to claim 1, characterized in that: The two welding devices are respectively located above the two ends of the tank body and correspond to the welds at the two ends of the tank body.

8. The tank welding system according to claim 2, characterized in that: The second magnetic tracking vehicle also includes a protective cover connecting bracket; The protective cover connecting bracket is connected between the frame of the second magnetic tracking vehicle and the gas protective cover, so that the gas protective cover and the second magnetic tracking vehicle move synchronously.

9. The tank welding system according to any one of claims 1 to 8, characterized in that: The gas protection cover is made of titanium alloy.

10. A tank welding method, characterized in that: The tank welding system according to any one of claims 1 to 9 comprises the steps of: Install the first magnetic tracking vehicle and the second magnetic tracking vehicle on the bottom of the tank body for opposite suction; Locking the locking member so that the locking member fastens the first magnetic tracking vehicle; The rotation of the roller frame drives the tank body to rotate, so that the first magnetic tracking vehicle and the second magnetic tracking vehicle rotate to the top of the tank body, and the welding device is aligned with the weld; The welding device is fixedly connected to the first magnetic tracking vehicle, and the locking piece is loosened; The roller frame drives the tank body to rotate, and the rotation of the tank body drives the first magnetic tracking vehicle to move, and the first magnetic tracking vehicle drives the welding device to weld along the weld, and the second magnetic tracking vehicle drives the gas protection cover to move with the first magnetic tracking vehicle to perform gas protection on the weld; After welding is completed, the locking piece is locked, and the welding device is separated from the first magnetic tracking vehicle; The roller frame is rotated to rotate the first magnetic tracking vehicle and the second magnetic tracking vehicle to the bottom of the tank body, and the first magnetic tracking vehicle and the second magnetic tracking vehicle are disassembled.

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