A method for synchronous painting during welding of heavy steel structures in coastal areas

Abstract

The present invention discloses a method for synchronous welding and painting of heavy steel structures in coastal areas, belonging to the field of steel structure spraying. It includes using zinc-aluminum alloy as the metal coating, and then spraying the primer layer, intermediate layer and topcoat layer; the surface is treated by sandblasting; the hoisting equipment is installed on the machine platform, and rotating components are respectively arranged at both ends of the machine platform and fixture one is installed to clamp one end of the H-shaped workpiece; there are two sets of center frames, and the distance between the two sets of center frames is adjusted by installing adjusting screws between the two sets of center frames; fixture two is installed on the moving part, and fixture two clamps the other end of the H-shaped workpiece; a track frame is installed on the center frame, and a welding mechanism is installed on the track frame; a fixed frame is installed outside the center frame, a spray gun and a sliding vehicle are installed in the fixed frame, the bottom of the sliding vehicle is connected to the spray gun, and the workpiece web, workpiece flange and workpiece end of the H-shaped workpiece are respectively sprayed. The present invention overcomes the technical problem of difficult synchronous processing of welding and spraying of H-shaped workpieces.

Description

Technical Field

[0001] The present invention belongs to the field of sea surface climate steel structure spraying, and specifically relates to a method for synchronous painting during welding of heavy steel structures in coastal areas. Background Art

[0002] Currently, the main anti-corrosion method for steel structures at home and abroad is the heavy anti-corrosion coating system, which is a triple-layer heavy anti-corrosion system composed of inorganic or epoxy zinc-rich primer, epoxy intermediate paint, and polyurethane topcoat.

[0003] For arc spraying, the spraying of the workpiece end is often interfered by the fixture, resulting in the inability to process the end. The end is commonly installed in the steel structure body and is also a relatively surface-exposed area. After the equipment finishes spraying, it is necessary to manually process the side, or process manually throughout the whole process; this leads to difficulty in controlling the coating thickness of manual spraying, and the processing efficiency will decrease over a long time.

[0004] Reference document CN115090475A, a rotary anti-corrosion coating device for offshore engineering pipelines, describes a method of lifting the steel pipe for spraying and cleaning. However, because the surface of the steel pipe is single, if the fixture is installed on the inner wall of the steel pipe, it can achieve non-interference with the spraying at both ends. When dealing with H-shaped steel or workpieces to be processed with closed ends, it is inevitable that the fixture will affect the spraying at both ends.

[0005] Secondly, when two groups of workpieces need to be welded, it is difficult for the existing technology to realize a device for unified welding and spraying operations. Summary of the Invention

[0006] The technical problem to be solved by the present invention is the technical problem of difficult synchronous processing of welding and spraying of H-shaped workpieces.

[0007] To solve the above technical problem, the inventor has obtained the technical solution of the present invention through practice and summary. A method for synchronous painting during welding of heavy steel structures in coastal areas includes the following steps:

[0008] Step 1, Coating material preparation: Arc spraying uses zinc-aluminum alloy as the metal coating, and then the primer layer, intermediate layer, and topcoat layer are applied by brushing.

[0009] The primer layer uses epoxy asphalt coating or nano-modified epoxy sealant coating, with a thickness of 50 - 70μm.

[0010] The intermediate layer uses one or more of zinc-rich paint, phenolic resin paint, and alkyd resin paint, with a thickness of 60 - 80μm.

[0011] The topcoat layer uses nano-modified fluorinated polyurethane coating or nano-modified fluorinated polysiloxane coating, with a thickness of 60 - 120μm; the overall coating thickness is 250 - 300μm.

[0012] Step 2. Surface treatment:

[0013] The surface of the H-shaped workpiece is sandblasted with sprayed quartz sand to make the surface cleanliness reach Sa2.5 or Sa3 level, and the surface roughness Ra should reach 25 - 100 μm;

[0014] Step 3. Installation and suspension connection

[0015] Install a lifting ring on the lifting hole of the H-shaped workpiece, and install it on the machine table by the lifting equipment;

[0016] For two groups of H-shaped workpieces to be welded, rotating components are respectively arranged at both ends of the machine table. Flange plates are oppositely installed on the two groups of rotating components. A fixture one is installed on the flange plate, and the fixture one is suitable for clamping one end of the corresponding H-shaped workpiece, and the other end is placed into the center frame through lifting;

[0017] There are two groups of center frames. Both groups of center frames include a base and a moving part. The moving part is installed on the base. The distance between the two groups of center frames is adjusted by installing an adjusting screw between the two groups of center frames;

[0018] A fixture two is installed on the moving part. The fixture two is assembled in a combined way to adapt to the H-shaped workpiece and clamp the other end of the corresponding H-shaped workpiece;

[0019] Step 4. Welding operation

[0020] A fixed frame is installed on the center frame, and a welding mechanism is installed on the fixed frame. The welding mechanism includes a welding torch and an adjusting part. The adjusting part is suitable for adjusting the welding height and welding angle of the welding torch; Adjust the two groups of moving parts in Step 3 to make the welding torch extend into the two groups of moving parts for welding;

[0021] Step 5. Spraying operation

[0022] After welding, cool for more than 2 hours. A fixed frame is installed outside the center frame. A spray gun and a sliding vehicle are installed in the fixed frame. The bottom of the sliding vehicle is connected to the spray gun, and the web, flange and end of the H-shaped workpiece are respectively sprayed;

[0023] Remove the adjusting screw, so that the spray guns of the two groups of center frames can spray at the welding place, and then repeat the spraying operation in Step 5 to spray the next coating of the H-shaped workpiece;

[0024] Step 6. After spraying is completed, take out the H-shaped workpiece and place it for static placement.

[0025] In a further technical solution, a first lead screw, a second lead screw, a main motor and a sub-motor are installed on the machine frame. Two sets of the center frames are installed on the first lead screw. The first lead screw is a bidirectional lead screw. The main motor and the first lead screw are adapted to be connected by a coupling and are adapted to rotate the first lead screw to drive the two sets of center frames to move.

[0026] There are two sets of the fixed frames which are fixedly installed on the outside of the center frames. The two sets of fixed frames are symmetrically arranged.

[0027] The bottom of the fixed frame is installed on the second lead screw. There are two sets of the second lead screws which are located on both sides of the first lead screw. A sub-motor is installed outside the second lead screw. The sub-motor is adapted to drive the fixed frame on the second lead screw to move.

[0028] In a further technical solution, in step five, it includes spraying the web of the workpiece:

[0029] It includes a spray gun and a fixed frame. The fixed frame includes a longitudinal plate and a transverse plate. The bottom of the transverse plate is arc-shaped. A transmission wheel assembly and a sliding cart are installed on the fixed frame. The transmission wheel assembly is adapted to drive the sliding cart to move. And the spray gun is installed on the sliding cart and outputs downward.

[0030] When the spray gun moves to one side of the web of the workpiece, set the rotation angle A of the rotating gear ring. Taking the rotation angle A as the positive direction, make the spraying range of the spray gun cover the web of the workpiece and both sides. Then rotate 180° to the web of the workpiece on the other side and spray.

[0031] In a further technical solution, in step five, it includes spraying the flange of the workpiece:

[0032] Rotate at an angle of 90°, move the center frame and drive the spray gun to spray along the flange of the workpiece.

[0033] Rotate 180° again to spray the flange of the workpiece on the other side.

[0034] In a further technical solution, in step five, it includes spraying the end of the workpiece:

[0035] The end of the workpiece includes both ends of the H-shaped workpiece and requires the spray gun to rotate at an angle B. The rotation angle of the arc-shaped bottom on the fixed frame is suitable for the spray gun to rotate at an angle B for working. A bearing block is detachably installed on the sliding cart. The spray gun is installed at the bottom of the bearing block. When the sliding cart reaches the connection of the longitudinal plate and the transverse plate, the transmission wheel assembly will drive the bearing block on the sliding cart to move towards the transverse plate and rotate until the rotation angle meets the rotation angle B, and then start spraying.

[0036] In a further technical solution, in step three, an installation block is arranged inside the center rest. Four groups of the installation blocks are provided and each is provided with a first installation hole. A second fixture is installed on the installation block, and the second fixture is suitable for installing and clamping an H-shaped workpiece.

[0037] The second fixture includes a support plate, a clamping plate and side plates. The clamping plate is fixedly connected to the side plates and the support plate respectively. The support plate is provided with a second installation hole adapted to the first installation hole. The support plate is detachably connected to the installation block.

[0038] The shape of the clamping plate is adapted to the concave cavity formed by the connection of the flange and the web of the workpiece.

[0039] The side plate is a bent plate, and the bent plate is provided with an installation positioning hole.

[0040] In a further technical solution, the moving part includes a fixed shell. A cavity is arranged inside the fixed shell. A rotating gear ring is installed in the cavity. The rotating gear ring is adapted to rotate in the cavity. The inner wall of the rotating gear ring is fixedly connected to the installation block. Two corresponding supporting bottom gears are installed at the bottom of the rotating gear ring. The two bottom gears are located on both sides of the vertical axis of the rotating gear ring. A driving motor is installed at one group of the bottom gears. The output shaft of the driving motor is adapted to drive the corresponding bottom gear. The base is installed on the first lead screw. The two center rests are installed on the threads with different helix directions of the first lead screw. A connection hole is arranged on the fixed shell, and the connection hole is adapted to be connected to an adjusting screw.

[0041] In a further technical solution, the first fixture includes a clamping mouth plate. The clamping mouth plate is a C-shaped plate. A connection disk is installed on one side of the clamping mouth plate opposite to the rotating part. The connection disk is connected to the flange plate.

[0042] The main frame body is installed on two second lead screws. The top of the main frame body is longitudinally arranged and an electric push rod is installed. A welding torch is installed at the bottom of the electric push rod. The welding torch is vertically arranged and installed on a torch bracket. A connection plate is installed at the output end of the electric push rod. A rotating screw is installed between the connection plate and the torch bracket. The rotating screw is adapted to pass through the space between the torch bracket and the connection plate and a nut is installed for locking.

[0043] In a further technical solution, the fixed frame is installed on the upper part of the center rest and is higher than the height of the second fixture.

[0044] Compared with the prior art, the present invention can achieve the following technical effects:

[0045] The first consideration of the present invention is the arc spraying effect of H-shaped workpieces. Commonly seen in the existing technology are round tubes or steel plates. If a handheld arc spraying gun is used, it can spray the surface with relatively high flexibility. However, firstly, the surface treatment cannot ensure the handheld distance, secondly, different coating thicknesses affect the service life of the workpiece, and thirdly, it is difficult to ensure the end treatment.

[0046] The H-shaped workpiece is refined into two groups of workpieces, namely the surface of the workpiece web, the connecting side of the workpiece web and the workpiece flange, the surface of the workpiece flange, and the end. During the spraying of the surface of the workpiece web, a stable reciprocating movement is required to ensure the spraying effect; the connecting side of the workpiece web and the workpiece flange requires a rotational angle; and the end spraying requires the spray gun to turn.

[0047] The hoisting holes are provided in the present invention considering that holes need to be drilled for synchronous installation in the steel structure during actual installation. The installation effect of using a center frame does not adopt the two-end installation method because the plane where the center frame is located is in a position convenient for processing, while the ends are not convenient for processing.

[0048] The present invention adopts a detachable fixture method including a support plate, a clamping plate, and a side plate, which are combined and clamped on the surface of the workpiece. Secondly, the present invention adopts a transmission rope method to achieve reciprocating movement and end arc movement. The transmission rope is further an elastic rope with elasticity. The traditional transmission chain, air cylinder, and hydraulic cylinder are coplanar, that is, they can only perform processing actions in one dimension. For example, it is difficult to add an arc rotation in the linear direction for linear transmission. The connection method of the transmission rope adopted in the present invention requires a fixing frame for simple actions. Under the requirement of non-coplanarity, a large number of air cylinders or transmission chains are not required to achieve the actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0050] Figure 1 is the structural diagram of the H-shaped workpiece;

[0051] Figure 2 is the front view schematic diagram of the machine platform of the present invention;

[0052] Figure 3 is Figure 2 the enlarged view of part A of

[0053] Figure 4 is Figure 2 the enlarged view of part B of

[0054] Figure 5 is the side sectional view of the center frame of the present invention;

[0055] Figure 6 It is the top view of the top of the fixing bracket of the present invention;

[0056] Figure 7 It is a schematic diagram of the top of the fixing bracket of the present invention;

[0057] Figure 8 It is the structural diagram of the bearing block of the present invention;

[0058] Figure 9 It is a connection schematic diagram of the transmission wheel assembly at the top of the fixing bracket of the present invention.

[0059] In the figure: 1, machine platform frame; 2, center frame; 3, spray gun; 4, fixing bracket; 5, first lead screw; 6, main motor; 7, second lead screw; 8, auxiliary motor; 9, clamping plate; 10, connecting plate; 11, rotating part; 12, main frame body; 13, electric push rod; 14, welding torch; 15, gun bracket; 16, connecting plate; 17, rotating screw; 18, adjusting screw; 21, mounting block; 22, support plate; 23, clamping plate; 24, side plate; 25, fixed shell; 26, rotating tooth ring; 27, bottom gear; 31, transmission pipeline; 41, longitudinal plate; 42, transverse plate; 43, middle groove; 44, groove rail; 45, sliding cart; 46, drive wheel one; 47, drive wheel two; 48, fixed wheel; 49, drive rope; 410, running motor; 411, notch part; 412, bearing block; 413, transverse wheel one; 414, transverse wheel two; 415, pipe sleeve one; 416, pipe sleeve two; 417, connecting motor; 418, arc-shaped support plate; 100, H-shaped workpiece; 101, lifting hole; 102, workpiece web; 103, workpiece flange; Detailed implementation manners

[0060] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following embodiments are used to further elaborate on the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0062] In ocean or coastal areas, the salt content of water vapor is relatively high. It is commonly divided into marine atmospheric zone, splash zone / tidal range zone, and fully submerged zone. The distribution should be related to the height above sea level. In coastal buildings, most of the H-shaped workpieces used are superstructures; in the marine atmospheric zone, good weather resistance is often considered to avoid ultraviolet or water vapor irradiation. Basically, the arc spraying material used is zinc-aluminum alloy for sacrificial anode cathodic protection with good protection effect.

[0063] The H-shaped workpiece 100 includes an H-shaped steel, and the H-shaped steel includes a workpiece web 102 and workpiece flanges 103 located on both sides of the workpiece web 102.

[0064] Embodiment

[0065] A method for synchronous painting during welding of heavy steel structures in coastal areas includes the following steps:

[0066] Step 1, Coating material preparation: For arc spraying, zinc-aluminum alloy is used as the metal coating, and then the primer layer, intermediate layer and topcoat layer are applied by brushing;

[0067] For the primer layer, epoxy asphalt coating or nano-modified epoxy sealing coating is used, and the thickness is 50 - 70 μm;

[0068] For the intermediate layer, one or more of zinc-rich paint, phenolic resin paint, and alkyd resin paint are used, and the thickness is 60 - 80 μm;

[0069] For the topcoat layer, nano-modified fluorinated polyurethane coating or nano-modified fluorinated polysiloxane coating is used, and the thickness is 60 - 120 μm; The overall coating thickness is 250 - 300 μm;

[0070] Step 2, Surface treatment:

[0071] The surface of the H-shaped workpiece 100 is sandblasted with sprayed quartz sand to make the surface cleanliness reach Sa2.5 or Sa3 level, and the surface roughness Ra should reach 25 - 100 μm;

[0072] Step 3, Installation and suspension

[0073] A lifting ring is installed on the lifting hole 101 of the H-shaped workpiece 100 and is lifted by a lifting device to the machine bench 1;

[0074] For two groups of H-shaped workpieces 100 to be welded, rotating components 11 are respectively arranged at both ends of the machine bench 1. Flange plates are oppositely installed on the two groups of rotating components 11, and a fixture one is installed on the flange plate. The fixture one is suitable for clamping one end of the corresponding H-shaped workpiece 100, and the other end is placed into the center frame 2 by lifting;

[0075] There are two groups of center frames 2. Both groups of center frames 2 include a base and a moving part. The moving part is installed on the base. The distance between the two groups of center frames 2 is adjusted by installing an adjusting screw 18 between the two groups of center frames 2;

[0076] A fixture two is installed on the moving part. The fixture two is assembled in a combined way to adapt to the H-shaped workpiece 100 and clamp the other end of the corresponding H-shaped workpiece 100;

[0077] Step 4, Welding operation

[0078] A fixed bracket is installed on the steady rest 2, and a welding mechanism is installed on the fixed bracket. The welding mechanism includes a welding torch 14 and an adjusting member, and the adjusting member is adapted to adjust the welding height and welding angle of the welding torch 14; adjust the two moving parts in step three so that the welding torch 14 extends into the two moving parts for welding;

[0079] Step Five: Spraying operation

[0080] After welding is completed, cool for more than 2 hours. A fixed bracket 4 is installed outside the steady rest 2. A spray gun 3 and a sliding carriage 45 are installed inside the fixed bracket. The bottom of the sliding carriage 45 is connected to the spray gun 3, and the web 102, flange 103 and end part of the H-shaped workpiece 100 are sprayed respectively;

[0081] The structure of the spray gun 3 adopts the existing technology, and basically all are wire feeding structures to push the metal wire, generate an arc through short circuit, and use compressed air for spraying to generate a spraying beam for spraying.

[0082] Step Six: Remove the adjusting screw 18 so that the spray guns of the two steady rests 2 can spray at the welding position, and then repeat the spraying operation in step five to spray the next coating of the H-shaped workpiece 100;

[0083] Step Seven: After spraying is completed, take out the H-shaped workpiece 100 and place it for static placement.

[0084] Further description:

[0085] In a further technical solution, a first lead screw 5, a second lead screw 7, a main motor 6 and a sub-motor 8 are installed on the machine frame 1. Two steady rests 2 are installed on the first lead screw 5. The first lead screw 5 is a bidirectional lead screw, and the main motor 6 and the first lead screw 5 are adapted to be connected by a coupling and are adapted to rotate the first lead screw 5 to drive the two steady rests 2 to move.

[0086] There are two fixed brackets 4 and they are fixedly installed outside the steady rest 2. The two fixed brackets 4 are symmetrically arranged;

[0087] The bottom of the fixed bracket is installed on the second lead screw 7. There are two second lead screws 7 and they are located on both sides of the first lead screw 5. A sub-motor 8 is installed outside the second lead screw 7, and the sub-motor 8 is adapted to drive the fixed bracket on the second lead screw 7 to move.

[0088] In step five, it includes spraying the web 102 of the workpiece:

[0089] It includes the spray gun 3 and the fixed bracket 4. The fixed bracket 4 includes a longitudinal plate 41 and a transverse plate 42. The bottom of the transverse plate 4 is arc-shaped. A transmission wheel assembly and a sliding carriage 45 are installed on the fixed bracket 4. The transmission wheel assembly is adapted to drive the sliding carriage 45 to move, and the spray gun 3 is installed on the sliding carriage 45 and outputs downward;

[0090] When the spray gun 3 moves to one side of the workpiece web 102, set the rotation angle A of the rotating toothed ring 26. Taking the rotation angle A as the positive direction, make the spraying range of the spray gun 3 cover the workpiece web 102 and both sides, and then rotate 180° to the workpiece web 102 on the other side and spray. The angle A is between 0° and 90°.

[0091] In step five, it includes spraying the workpiece flange 103:

[0092] Rotate at an angle of 90°, move the center rest 2 and drive the spray gun 3 to spray along the workpiece flange 103; rotate 180° again to spray the workpiece flange 103 on the other side.

[0093] In a further technical solution, in step five, it includes spraying the end of the workpiece:

[0094] First, the tops of the longitudinal plate 41 and the transverse plate 42 are suitable for forming a "T" shape. Both the longitudinal plate 41 and the transverse plate 42 are frame plates, and the length of the longitudinal plate 41 is greater than the length of the transverse plate 42;

[0095] Both the longitudinal plate 41 and the transverse plate 42 are provided with intermediate grooves 43 and are connected. Both sides of the inner wall of the longitudinal plate 41 are provided with groove rails 44, and a sliding carriage 45 is installed between the two groups of groove rails 44. A spray gun 3 is installed in the sliding carriage 45, and the spray gun 3 is suitable for arc spraying and processing the H-shaped workpiece 100 downward.

[0096] At both longitudinal ends of the longitudinal plate 41, a first driving wheel 46 and a second driving wheel 47 are respectively arranged. A fixed wheel 48 is installed on the sliding carriage 45. The fixed wheel 48 is suitable for being installed at the upper end of the sliding carriage 45. One end of a transmission rope 49 is installed on the fixed wheel 48, and the other end of the transmission rope 49 is suitable for being wound around the first driving wheel 46 and the second driving wheel 47 and fixed on the sliding carriage 45; a fixed frame is installed on the fixed wheel 48, and an operating motor 410 is installed on the fixed frame. The output shaft of the operating motor 410 is connected to the fixed wheel 48, and the operating motor 410 is suitable for driving the sliding carriage 45 to move along the longitudinal plate 41.

[0097] As Figure 7 shown, a notch part 411 is arranged on the sliding carriage 45, that is, a notch will be opened, and a bearing plate 412 is filled and installed for easy peeling; the notch part 411 is suitable for being opened towards one side of the transverse plate 42. A bearing block 412 is installed on the notch part 411. The bearing block 412 is suitable for being detachably connected to the notch part 411. The spray gun 3 is installed under the notch part 411. The spray gun 3 includes a transmission pipeline 31, and the transmission pipeline 31 is installed at the upper end of the bearing block 412; the so-called notch part 411 is a groove with a bottom opened on the sliding carriage 45, and a separable bearing block 412 is installed in the groove. During normal longitudinal movement, as Figure 9 the transmission rope in is transmitted at a height higher than the longitudinal plate 42, that is Figure 3As shown, it will not affect the actual use of the spray gun 3.

[0098] Both the top and bottom of the transverse plate 42 are arc-shaped. One end of the transverse plate 42 far from the longitudinal plate 41 is provided with a first rotating shaft. A first transverse wheel 413 is installed at the top of the first rotating shaft. A second rotating shaft is installed on the sliding cart 45 and a second transverse wheel 414 is installed at the top.

[0099] A transmission rope 49 is installed on the first transverse wheel 413. A first pipe sleeve 415 is hingedly installed on the transmission rope 49. The first pipe sleeve 415 is adapted to be sleeved on the transmission pipeline 31. A limiting ring is fixedly installed on the transmission pipeline 31. The limiting ring is adapted to limit the position of the first pipe sleeve 415 on the transmission pipeline 31.

[0100] A transmission rope 49 is installed on the second transverse wheel 414. A second pipe sleeve 416 is hingedly installed on the transmission rope 49. The second pipe sleeve 416 is adapted to be sleeved on the transmission pipeline 31 and is located between the limiting ring and the first pipe sleeve 415. Connecting motors 417 are installed on both the first transverse wheel 413 and the second transverse wheel 414. The two groups of connecting motors 417 are adapted to drive the first transverse wheel 413 and the second transverse wheel 414 to rotate respectively.

[0101] Arc-shaped support plates 418 are arranged on both sides of the bearing block 412. An arc-shaped groove is arranged inside the transverse plate 42. The arc-shaped support plates 418 are adapted to slide in the arc-shaped groove.

[0102] A transverse lead screw 5 and a main motor 6 are installed on the machine frame 1. The center frame 2 is installed on the transverse lead screw 5. The main motor 6 and the transverse lead screw 5 are adapted to be connected by a coupling and are adapted to drive the center frame 2 to move by rotating the transverse lead screw 5.

[0103] Corner rotation:

[0104] The two ends of the workpiece end include the two ends of the H-shaped workpiece 100, and the spray gun 3 needs to rotate by an angle B. The rotation angle of the arc-shaped bottom on the fixed frame 4 is adapted to the working rotation angle B of the spray gun 3. A bearing block 412 is detachably installed on the sliding cart 45. A spray gun 3 is installed at the bottom of the bearing block 412. When the sliding cart 45 reaches the connection of the longitudinal plate 41 and the transverse plate 42, the transmission wheel assembly will drive the bearing block 412 on the sliding cart 45 to move towards the transverse plate 42 and rotate until the rotation angle meets the rotation angle B, and then start spraying. The angle B is 0 to 60°. The actual angle B is determined according to actual needs, and the length of the actual transverse plate 42 is designed.

[0105] In step three, an installation block 21 is arranged inside the center frame 2. The installation block 21 is arranged in four groups and all are provided with first installation holes. A second clamp is installed on the installation block 21. The second clamp is adapted to install and clamp the H-shaped workpiece 100.

[0106] Fixture II includes a support plate 22, a clamping plate 23 and a side plate 24. The clamping plate 23 is fixedly connected to the side plate 24 and the support plate 22 respectively. An installation hole II adapted to the installation hole I is provided on the support plate 22. The support plate 22 is detachably connected to the installation block 21;

[0107] The shape of the clamping plate 23 is adapted to the concave cavity formed by connecting with the workpiece flange 103 and the workpiece web 102;

[0108] The side plate 24 is a bent plate, and an installation positioning hole is provided on the bent plate.

[0109] The moving part includes a fixed shell 25. A cavity is provided inside the fixed shell 25. A rotating gear ring 26 is installed in the cavity. The rotating gear ring 26 is adapted to rotate inside the cavity. The inner wall of the rotating gear ring 26 is fixedly connected to the installation block 21. Two sets of corresponding supporting bottom gears 27 are installed at the bottom of the rotating gear ring 26. The two sets of bottom gears 27 are located on both sides of the vertical axis of the rotating gear ring 26. A driving motor is installed at one set of bottom gears 27. The output shaft of the driving motor is adapted to drive the corresponding bottom gear 27. The base is installed on the first lead screw 5. The two sets of center frames 2 are installed on the threads with different helix directions of the first lead screw 5; A connection hole is provided on the fixed shell 25, and the connection hole is adapted to be connected to the adjusting screw 18.

[0110] Fixture I includes a clamping plate 9. The clamping plate 9 is a C-shaped plate. A connection disk 10 is installed on one side of the clamping plate 9 opposite to the rotating part 11. The connection disk 10 is connected to the flange disk;

[0111] The main frame body 12 is installed on the two sets of second lead screws. The top of the main frame body 12 is longitudinally arranged and an electric push rod 13 is installed. A welding torch 14 is installed at the bottom of the electric push rod 13. The welding torch 14 is vertically arranged and installed on the torch bracket 15. A connecting plate 16 is installed at the output end of the electric push rod 13. A rotating screw 17 is installed between the connecting plate 16 and the torch bracket 15. The rotating screw 17 is adapted to pass through between the torch bracket 15 and the connecting plate 16 and a nut is installed for locking.

[0112] The fixing frame 4 is installed on the upper part of the center frame 2 and is higher than the height of Fixture II.

Claims

1. A method for synchronous painting during welding of heavy steel structures in coastal areas, characterized in that: It includes the following steps: Step 1, Coating material preparation: For arc spraying, zinc-aluminum alloy is used as the metal coating, and then the primer layer, intermediate layer and topcoat layer are applied by brushing; For the primer layer, epoxy asphalt coating or nano-modified epoxy sealing coating is used, with a thickness of 50 - 70μm; For the intermediate layer, one or more of zinc-rich paint, phenolic resin paint, and alkyd resin paint are used, with a thickness of 60 - 80μm; For the topcoat layer, nano-modified fluorinated polyurethane coating or nano-modified fluorinated polysiloxane coating is used, with a thickness of 60 - 120μm; The overall coating thickness is 250 - 300μm; Step 2, Surface treatment: The surface of the H-shaped workpiece (100) is sandblasted with sprayed quartz sand to make the surface cleanliness reach Sa2.5 level or Sa3 level, and the surface roughness Ra should reach 25 - 100μm; Step 3, Installation and hoisting connection: A lifting ring is installed on the lifting hole (101) of the H-shaped workpiece (100) and is hoisted by a hoisting device to the machine platform (1); For two groups of H-shaped workpieces (100) to be welded, rotating components (11) are respectively arranged at both ends of the machine platform (1). Flange plates are relatively installed on the two groups of rotating components (11), and a fixture one is installed on the flange plate. The fixture one is suitable for clamping one end of the corresponding H-shaped workpiece (100), and the other end is placed into the center frame (2) by hoisting; There are two groups of center frames (2). Both groups of center frames (2) include a base and a moving part. The moving part is installed on the base. The distance between the two groups of center frames (2) is adjusted by installing an adjusting screw rod (18) between the two groups of center frames (2); A fixture two is installed on the moving part. The fixture two is assembled in a combined manner to adapt to the H-shaped workpiece (100) and clamp the other end of the corresponding H-shaped workpiece (100); Step 4, Welding operation: A fixed frame is installed on the center frame (2), and a welding mechanism is installed on the fixed frame. The welding mechanism includes a welding torch (14) and an adjusting part. The adjusting part is suitable for adjusting the welding height and welding angle of the welding torch (14); Adjust the two groups of moving parts in Step 3 to extend the welding torch (14) into the two groups of moving parts for welding; Step 5, Spraying operation: After welding is completed and cooled for more than 2h, a fixed frame (4) is installed outside the center frame (2). A spray gun (3) and a sliding cart (45) are installed in the fixed frame. The bottom of the sliding cart (45) is connected to the spray gun (3), and the workpiece web (102), workpiece flange (103) and workpiece end of the H-shaped workpiece (100) are respectively sprayed; Step 6, Remove the adjusting screw rod (18) so that the spray guns of the two groups of center frames (2) can spray at the welding place, and then repeat the spraying operation in Step 5 to spray the next coating of the H-shaped workpiece (100); Step 7, After spraying is completed, take out the H-shaped workpiece (100) and place it for static settlement.

2. The method for synchronous painting during welding of heavy steel structures in coastal areas according to claim 1, characterized in that: A first lead screw (5), a second lead screw (7), a main motor (6) and an auxiliary motor (8) are installed on the machine frame (1). Two sets of the center frames (2) are installed on the first lead screw (5). The first lead screw (5) is a bidirectional lead screw. The main motor (6) and the first lead screw (5) are adapted to be connected by a coupling and are adapted to rotate the first lead screw (5) to drive the two sets of center frames (2) to move. Two sets of the fixed frames (4) are provided and fixedly installed on the outer sides of the center frames (2). The two sets of the fixed frames (4) are symmetrically arranged. The bottom of the fixed frame is installed on the second lead screw (7). Two sets of the second lead screws (7) are provided and are located on both sides of the first lead screw (5). An auxiliary motor (8) is installed outside the second lead screw (7). The auxiliary motor (8) is adapted to drive the fixed frame on the second lead screw (7) to move.

3. A method for synchronous painting during welding of heavy steel structures in coastal areas according to claim 1, characterized in that: In step five, it includes spraying the workpiece web (102). The spraying mechanism includes a spray gun (3) and a fixed frame (4). The fixed frame (4) includes a longitudinal plate (41) and a transverse plate (42). The bottom of the transverse plate (42) is arc-shaped. A transmission wheel assembly and a sliding carriage (45) are installed on the fixed frame (4). The transmission wheel assembly is adapted to drive the sliding carriage (45) to move, and the spray gun (3) is installed on the sliding carriage (45) and outputs downward. When the spray gun (3) moves to one side of the workpiece web (102), set the rotation angle A of the rotating toothed ring (26). Taking the rotation angle A as the positive direction, so that the spraying range of the spray gun (3) covers the workpiece web (102) and both sides, and then rotate 180° to the workpiece web (102) on the other side and spray.

4. A method for synchronous painting during welding of heavy steel structures in coastal areas according to claim 1, characterized in that: In step five, it includes spraying the workpiece flange (103): Rotate 90°, move the center frame (2) and drive the spray gun (3) to spray along the workpiece flange (103); Rotate 180° again to spray the workpiece flange (103) on the other side.

5. A method for synchronous painting during welding of heavy steel structures in coastal areas according to claim 3, characterized in that: In step five, it includes spraying the workpiece end: The workpiece end includes both ends of the H-shaped workpiece (100), and the spray gun (3) needs to rotate an angle B; the rotation angle of the arc-shaped bottom on the fixed frame (4) is suitable for the spray gun (3) to rotate an angle B for work; a bearing block (412) is detachably installed on the sliding carriage (45), and the spray gun (3) is installed at the bottom of the bearing block (412); when the sliding carriage (45) reaches the connection of the longitudinal plate (41) and the transverse plate (42), the transmission wheel assembly will drive the bearing block (412) on the sliding carriage (45) to move towards the transverse plate (42) and rotate until the rotation angle meets the rotation angle B, and then start spraying.

6. A method for synchronous painting during welding of heavy steel structures in coastal areas according to claim 1, characterized in that: In step three, an installation block (21) is arranged inside the center frame (2). Four groups of the installation blocks (21) are provided and each is provided with a first installation hole. A second fixture is installed on the installation block (21), and the second fixture is suitable for installing and clamping the H-shaped workpiece (100). The second fixture includes a support plate (22), a clamping plate (23) and a side plate (24). The clamping plate (23) is fixedly connected to the side plate (24) and the support plate (22) respectively. The support plate (22) is provided with a second installation hole adapted to the first installation hole. The support plate (22) is detachably connected to the installation block (21). The shape of the clamping plate (23) is adapted to the concave cavity formed by connecting the workpiece flange (103) and the workpiece web (102). The side plate (24) is a bent plate, and an installation positioning hole is provided on the bent plate.

7. A method for synchronous welding and painting of heavy steel structures in coastal areas according to claim 1, characterized in that: The moving part includes a fixed shell (25). A cavity is provided inside the fixed shell (25). A rotating toothed ring (26) is installed inside the cavity. The rotating toothed ring (26) is adapted to rotate inside the cavity. The inner wall of the rotating toothed ring (26) is fixedly connected to the installation block (21). Two corresponding supporting bottom gears (27) are installed at the bottom of the rotating toothed ring (26). The two bottom gears (27) are located on both sides of the vertical axis of the rotating toothed ring (26). A driving motor is installed at one group of the bottom gears (27). The output shaft of the driving motor is adapted to drive the corresponding bottom gear (27). The base is installed on the first lead screw (5). The two center frames (2) are installed on the threads with different rotation directions of the first lead screw (5). A connection hole is provided on the fixed shell (25), and the connection hole is adapted to be connected to the adjusting screw (18).

8. A method for synchronous welding and painting of heavy steel structures in coastal areas according to claim 1, characterized in that: The first fixture includes a clamping plate (9). The clamping plate (9) is a C-shaped plate. A connecting disk (10) is installed on one side of the clamping plate (9) opposite to the rotating part (11). The connecting disk (10) is connected to the flange disk. The main frame body (12) is installed on the two second lead screws (7). The main frame body (12) is longitudinally arranged at the top and an electric push rod (13) is installed. A welding torch (14) is installed at the bottom of the electric push rod (13). The welding torch (14) is vertically arranged and installed on the torch bracket (15). A connecting plate (16) is installed at the output end of the electric push rod (13). A rotating screw (17) is installed between the connecting plate (16) and the torch bracket (15). The rotating screw (17) is adapted to pass through between the torch bracket (15) and the connecting plate (16) and a nut is installed for locking.

9. A method for synchronous welding and painting of heavy steel structures in coastal areas according to claim 1, characterized in that: The fixed frame (4) is installed on the upper part of the center frame (2) and is higher than the height of the second fixture.

Images