Wind turbine nacelle base crack welding device and method

Abstract

The invention discloses a crack welding device and method for a nacelle base of a wind turbine generator set, and relates to the technical field of crack welding for a nacelle base of a wind turbine generator set. A welding device is arranged on one side of a base frame, and the welding device is equipped with a welding clamp; the device also includes: a mounting frame, which is fixed to the top surface of the base frame, and a cleaning unit is arranged on one side of the mounting frame, and the cleaning unit is used to clean oil stains on the surface of the nacelle base; a lifting unit, which is arranged on one side of the mounting frame, and the lifting unit is used to drive the cleaning unit to lift; the invention drives the bevel gears in the lifting unit to engage accurately through a driving motor to drive the lead screw to run smoothly, thereby realizing accurate lifting and lowering adjustment of a movable plate, and utilizing the adjustment mechanism of the lifting unit to enable the height of components of a cleaning mechanism and a flame-spraying mechanism to be flexibly adjusted, so as to meet the cleaning requirements of cracks of different heights, improve the cleaning efficiency, enhance the applicability and flexibility of the device, and facilitate the operator to quickly adjust the height of the device to achieve the best cleaning effect.

Description

Technical Field

[0001] The invention relates to the technical field of crack welding of a nacelle base of a wind turbine generator set, and in particular to a crack welding device and method for a nacelle base of a wind turbine generator set. Background Art

[0002] The nacelle base of a wind turbine generator set is an important part of a wind turbine generator set, and is mainly composed of a base, a lower platform assembly, an inner platform assembly, an upper platform assembly, and a nacelle ladder. The base is made of ductile iron to provide support for the nacelle, and the flange surface connected to the fixed axis of the generator is designed at a 3° inclination to prevent the blades from hitting the tower during rotation. The main function of the nacelle base is to support the generator, yaw drive and other components to ensure the stable operation of the wind turbine generator set. The base assembly is connected to the tower through a yaw bearing, and drives the nacelle assembly, generator assembly, pitch system assembly and other components through the yaw system. The yaw system adopts an active wind gear drive form, which cooperates with the control system to keep the impeller in a windward state at all times, making full use of wind energy, improving power generation efficiency, and providing the necessary locking torque to ensure the safe operation of the unit.

[0003] Chinese patent announcement number (CN114559206A) discloses a method for repairing cracks in the chassis of the nacelle of a wind turbine generator set by welding and strengthening, which belongs to the technical field of online cold welding repair methods for large-scale ductile iron. It can realize large-scale cold welding of the front cabin base at the wind turbine site, improve the service life of the base, and greatly save maintenance time and cost. The method for repairing cracks in the chassis of the wind turbine generator set by welding and strengthening includes welding repairs at the chassis cracks and reinforcement of the outer reinforcement ribs of the chassis; the welding repairs at the chassis cracks are selected according to the characteristics and weldability of ductile iron, and the Amalloy 440 cast iron welding rod is selected, and the weld can meet the mechanical strength and ductility required by ductile iron welding. Although the above patent document can improve the service life of the base and save maintenance time and cost, it cannot solve the problem of difficult cleaning of oil stains on the surface of the base and low welding efficiency when welding the cracks of the wind turbine base.

[0004] At present, the welding methods for cracks in the nacelle base of wind turbine generator sets mainly include: surface oil treatment, groove treatment and welding construction. The first operation is the surface oil treatment of the base. However, the existing oil treatment method needs to judge the treatment method according to the degree of oil pollution, which is divided into two methods: cleaning with detergent and burning. In the actual construction site environment, due to the cumbersome construction steps, it is difficult to deal with different surface oil pollutions of the base accordingly, which affects the welding efficiency of the base cracks and the final welding effect. For this reason, we propose a wind turbine nacelle base crack welding device and method. Summary of the invention

[0005] The object of the present invention is to provide a wind turbine nacelle base crack welding device and method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A crack welding device for a nacelle base of a wind turbine generator set, comprising a welding device arranged on one side of the base frame, and the welding device is equipped with a welding clamp;

[0007] Also includes:

[0008] A mounting frame, the mounting frame is fixed to the top surface of the base frame, and a cleaning unit is provided on one side of the mounting frame, and the cleaning unit is used to clean the oil stains on the surface of the cabin base;

[0009] A lifting unit is arranged on one side of the mounting frame, and is used to drive the cleaning unit to lift. An auxiliary component is arranged on one side of the mounting frame, and the auxiliary component can be used to mount welding tongs and grinders.

[0010] Preferably, the cleaning unit comprises a flame spraying mechanism and a cleaning mechanism, wherein the flame spraying mechanism comprises:

[0011] A movable plate, the movable plate is slidably connected to one side of the mounting frame, an additional frame is fixed to one side of the movable plate, a bearing plate is slidably connected to one side of the additional frame, a rotating frame is fixed to one side of the bearing plate, one side of the rotating frame is rotatably connected to the rotating frame through a rod body, a flamethrower is connected to the top surface of the rotating frame through a positioning frame, and the flamethrower is used to burn and evaporate deep oil stains on the surface of the cabin base;

[0012] A fuel tank is arranged on one side of the chassis, and a connecting pipe is fixed between the flamethrower and the fuel tank;

[0013] Other cleaning mechanisms include:

[0014] An installation frame is fixed on one side of the movable plate, a bearing plate is slidably connected to the inner side of the installation frame, a bracket is fixed on one side of the bearing plate, one side of the bracket is rotatably connected to a connecting frame through a rotating rod, one side of the connecting frame is rotatably connected to a brush roller, and a servo motor coaxially fixed with the brush roller is fixed on one side of the connecting frame, and the brush roller is driven by the servo motor to rotate to clean the welding part of the cabin base;

[0015] Two hinged seats, the two hinged seats are fixed on one side of the bearing plate, one side of the connecting frame is rotatably connected with a transmission rod, and two electric push rods are hinged between the transmission rod and the two hinged seats, and the connecting frame is driven to rotate along the axis of the rotating rod through the electric push rod;

[0016] A water spray pipe is arranged on one side of the second supporting plate, a nozzle is fixed on one side of the water spray pipe, a water storage tank is fixed on one side of the base frame, a water pump is fixed on the outside of the water storage tank, a first water pipe connected to the water pump is fixed between the input end of the water pump and the water storage tank, a second water pipe connected to the water spray pipe is fixed between the output end of the water pump and the water spray pipe, and a transmission member compatible with the first supporting plate and the second supporting plate is arranged on one side of the movable plate.

[0017] Preferably, the lifting unit comprises:

[0018] A guide rod is fixed on one side of the mounting frame, a lead screw is connected between the mounting frame and the base frame for common rotation, one side of the movable plate is threadedly connected to the lead screw, and the other side of the movable plate is slidably penetrated by the guide rod, a drive motor is fixed on one side of the mounting frame, a bevel gear is fixed between the output shaft of the drive motor and the lead screw, and the two bevel gears are meshed and connected with each other.

[0019] Preferably, the auxiliary components include:

[0020] An additional frame is fixed to one side of the mounting frame, one side of the additional frame is rotatably connected with a shaft body, a winding drum is tightly sleeved on the outer surface of the shaft body, a rope is wound on the surface of the winding drum, one end of the rope is fixed with a hook, and the hook is used to mount a welding clamp or a polisher;

[0021] The connecting ring is tightly sleeved on the outer surface of the shaft body. A torsion spring is sleeved on the surface of the shaft body. The two ends of the torsion spring are respectively fixed to the mounting frame and one side of the connecting ring. A limiting piece adapted to the shaft body is provided on one side of the mounting frame.

[0022] Preferably, the limiting member comprises:

[0023] A ratchet wheel is tightly sleeved on the outer surface of the shaft, a pawl is rotatably connected to one side of the mounting frame, the pawl is engaged with the ratchet wheel, and the engagement and limiting of the shaft body are achieved through the engagement of the pawl and the ratchet wheel, a center rod is rotatably connected to one side of the mounting frame, a transmission frame is tightly sleeved on the outer surface of the center rod, and the transmission frame and the pawl are rotatably connected through the rod body;

[0024] The loading frame is fixed on one side of the mounting frame, a pull rod is slidably passed through one side of the loading frame, a pull ring is fixed at one end of the pull rod, and a return spring is sleeved on the outer surface of the pull ring, one end of the return spring is fixed to one side of the loading frame, a mounting ring fixed to the return spring is tightly sleeved on the outer surface of the pull rod, and a connecting rod is hinged between one end of the pull rod and the transmission frame.

[0025] Preferably, the transmission member comprises:

[0026] A groove is provided on one side of the movable plate, a rotating shaft is rotatably connected in the groove, two spur gears are tightly sleeved on the outer surface of the rotating shaft, a toothed groove is provided on one side of the supporting plate adjacent to the supporting plate, and the spur gears are meshed and connected with the toothed groove.

[0027] Preferably, the load-bearing plate and one side of the load-bearing plate are both fixed with guide wheels, the installation frame and one side of the installation frame are both provided with guide grooves, the guide wheels are slidably connected in the guide grooves, the load-bearing plate and the vertical cross-sections of the load-bearing plate can be arranged in an I-shape, and the length of the installation frame is consistent with the length of the installation frame.

[0028] Preferably, the sides of the rotating frame adjacent to the rotating frame are both arranged in an arc surface, two dampers are hingedly connected between the rotating frames, a limiting groove adapted to the flamethrower is opened on one side of the positioning frame, the central axis of the rotating frame is arranged in a collinear manner with the central axis of the rod body, and the central axis of the rotating frame is arranged in a collinear manner with the central axis of the rotating frame.

[0029] Preferably, a plurality of universal wheels are fixed on one side of the base frame, a storage box is provided on one side of the base frame, a mounting sleeve is fixed on one side of the mounting frame, and a storage box is inserted into the mounting sleeve.

[0030] Preferably, a crack welding method for a nacelle base of a wind turbine generator set comprises the following steps:

[0031] S1. Surface oil treatment: First, the oil on the cracks of the generator cabin base needs to be removed. When cleaning shallow oil, the cleaning agent is sprayed onto the cracks through the cleaning mechanism to decompose the oil on the surface of the base. After the oil is decomposed, the brush roller is used to clean the surface of the base. When deep oil needs to be cleaned, the flame spray mechanism is used to heat the deep oil on the surface of the base to evaporate or burn the oil;

[0032] S2. Bevel treatment: Bevel the crack edge of the base to ensure that the weld can fully bite. The bevel depth is controlled at 2-3 mm to ensure that the welding rod can weld successfully in one time. Stop holes are made at both ends of the crack to prevent stress from being generated during welding.

[0033] S3. Select welding rods: Use Amelloy 440 cast iron welding rods, whose welds can meet the mechanical strength and ductility required for ductile iron welding. Adjust the welding current of the welding device according to the type of welding rod. Before welding, test the current with scrap iron plates to reduce heat output and ensure a stable molten pool.

[0034] S4. Welding operation: During the welding process, take the welding clamp mounted on the hook, keep the weld narrow and avoid large swings, and perform jump welding in sections according to the length of the crack. After each welding, tap to release the stress, and continue welding the next section after cooling;

[0035] S5. Appearance inspection:

[0036] (1) After welding, the weld needs to be inspected for 100% appearance. The acceptance standard for arc pits, pores, lack of fusion and undercut defects on the weld surface is GB / T11345-2013 and reaches quality grade B;

[0037] (2) The weld excess height shall not exceed 10% of the weld width and the maximum shall not exceed 5 mm. The repaired position shall be polished to be flush with the parent material and subjected to non-destructive testing to meet the requirements.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention drives the bevel gears to mesh precisely through the driving motor in the lifting unit, drives the lead screw to run smoothly, and realizes precise lifting and lowering adjustment of the movable plate. The adjustment mechanism of the lifting unit is utilized to make the heights of the components of the cleaning mechanism and the flame-spraying mechanism flexibly adjustable to meet the cleaning needs of cracks at different heights, improve the cleaning efficiency, enhance the applicability and flexibility of the equipment, and facilitate the operator to quickly adjust the height of the equipment to achieve the best cleaning effect.

[0040] Through the meshing of spur gears and toothed grooves, the load-bearing plate can move in opposite directions after being subjected to force, cleverly realizing the retreat of the flame-spraying mechanism when the cleaning mechanism advances, and vice versa. The transmission part conversion mechanism effectively avoids the situation where the work is affected by the interference of the mechanism, ensures safe and stable operation, simplifies the operation process, improves the convenience of user use, and further improves the efficiency of cleaning the cracks on the base.

[0041] The present invention provides an auxiliary component and adds a hook to facilitate the mounting of tools such as polishers, welding tongs, etc., thereby improving work efficiency. It not only improves the convenience of tool mounting, but also ensures stability and safety during use, simplifies the storage and management process, makes work more efficient and orderly, and solves the problem of tool storage management. When the winding drum limit needs to be released, the pull ring can be pulled, so that when the traction rope is pulled to a suitable length, the pawl will automatically re-engage with the ratchet to complete the limiting of the winding drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 It is a side view structural schematic diagram of the present invention;

[0044] Figure 3 It is a schematic diagram of the back structure of the present invention;

[0045] Figure 4 for Figure 3 A schematic diagram of the structure at the center A area;

[0046] Figure 5 for Figure 3 A schematic diagram of the structure at the middle B area is enlarged;

[0047] Figure 6It is a partial structural schematic diagram of the lifting unit and the cleaning unit in the present invention;

[0048] Figure 7 It is a schematic diagram of the structure of the transmission part in the present invention;

[0049] Figure 8 It is a partial structural schematic diagram of the flame-spraying mechanism in the present invention;

[0050] Fig. 9 for Figure 8 A magnified schematic diagram of the structure of the middle C region;

[0051] Fig.10 It is a schematic diagram of the main structure of the present invention;

[0052] Fig.11 It is a schematic diagram of the cleaning mechanism in the present invention when viewed from above;

[0053] Fig.12 for Fig.11 Schematic diagram of the enlarged structure of area D in the middle.

[0054] In the figure:

[0055] 1. Base frame; 2. Mounting frame;

[0056] 3. Cleaning unit;

[0057] 3a, flame spraying mechanism; 3a1, movable plate; 3a2, first mounting frame; 3a3, first bearing plate; 3a4, first rotating frame; 3a5, first rod body; 3a6, second rotating frame; 3a7, positioning frame; 3a8, flame spraying gun; 3a9, fuel tank; 3a10, pipeline;

[0058] 3b, cleaning mechanism; 3b1, second mounting frame; 3b2, second bearing plate; 3b3, bracket; 3b4, rotating rod; 3b5, connecting frame; 3b6, brush roller; 3b7, servo motor; 3b8, hinge seat; 3b9, transmission rod; 3b10, electric push rod; 3b11, water spray pipe; 3b12, nozzle; 3b13, water storage tank; 3b14, water pump; 3b15, first water pipe; 3b16, second water pipe;

[0059] 4. Lifting unit; 401. Guide rod; 402. Screw rod; 403. Drive motor; 404. Bevel gear; 5. Auxiliary components; 501. Mounting frame; 502. Shaft body; 503. Winding drum; 504. Rope; 505. Hook; 506. Connecting ring; 507. Torsion spring;

[0060] 5a, limiter; 5a1, ratchet; 5a2, pawl; 5a3, center rod; 5a4, transmission frame; 5a5, second rod body; 5a6, loading frame; 5a7, pull rod; 5a8, pull ring; 5a9, return spring; 5a10, mounting ring; 5a11, connecting rod;

[0061] 6. Transmission member; 601. Groove; 602. Rotating shaft; 603. Spur gear; 604. Toothed groove; 7. Guide wheel; 8. Guide groove; 9. Damper; 10. Limiting groove; 11. Universal wheel; 12. Storage box; 13. Mounting sleeve; 14. Storage box. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1:

[0063] See also Figure 1-Figure 12 The wind turbine nacelle base crack welding equipment shown in the figure includes a welding device arranged on one side of the base frame 1. The base frame 1 is composed of a plurality of steel shapes. A plurality of universal wheels 11 are fixed on one side of the base frame 1. The universal wheels 11 are made of rubber material, which not only has a good load-bearing effect, but also can improve the durability of use. A storage box 12 is arranged on one side of the base frame 1. With the arrangement of the storage box 12, it is convenient to place tools in the storage box 12 for storage, so that the tools can be taken out for use. A mounting sleeve 13 is fixed on one side of the mounting frame 2, and a storage box 14 is inserted in the mounting sleeve 13. With the storage box 14 and the mounting sleeve 13 being inserted, it is convenient to insert the storage box 14 The storage box 14 is provided to facilitate storage of the grinder and other tools, which is conducive to operation, so that the device has strong stability and bearing strength, and the welding device is equipped with a welding clamp. Before using the welding clamp, it is necessary to check the various parts of the welding clamp, clean the welding clamp, adjust the parameters of the welding clamp, wear protective equipment, hold the gun, open the welding clamp, feed the wire, start welding, end welding and maintain the welding clamp. It also includes: a mounting frame 2, the mounting frame 2 is fixed to the top surface of the base frame 1, the cross section of the mounting frame 2 is concave, and a cleaning unit 3 is provided on one side of the mounting frame 2, which is used to clean the oil on the surface of the cabin base through the cleaning unit 3;

[0064] A lifting unit 4 is provided on one side of the mounting frame 2. The lifting unit 4 is used to drive the cleaning unit 3 to lift. The lifting unit 4 is used to drive the cleaning unit 3 to lift and move. This can be used to clean cracks at different heights. An auxiliary component 5 is provided on one side of the mounting frame 2. The auxiliary component 5 can be used to mount welding tongs and grinders.

[0065] It should be noted that the welding device mainly includes a welding power source, welding clamps, welding cables and ground wire clamps. These devices work together to complete the electrode welding process. In addition, there are some auxiliary equipment, such as welding cable quick connectors, quick connectors, masks and goggles. Although these devices are not the core components of the electrode welding device, they are crucial to the smooth progress of the welding process and the safety protection of welders. The construction personnel use the welding device to weld the cracks in the base. This is a conventional setting in this field, so it will not be described in detail here.

[0066] In addition, an ultrasonic detector is arranged on the top surface of the base frame 1, and the ultrasonic detector is mainly composed of the following parts: an ultrasonic transmitter, a receiver, a timing circuit, a synchronization circuit, a transmitting circuit, a receiving circuit, a horizontal scanning circuit, a display and a power supply. These parts work together to enable the ultrasonic detector to effectively detect and evaluate the defects or characteristics inside various materials, so as to realize the appearance inspection of the weld of the cabin base of the wind turbine generator set. This is a conventional setting in the field, so it will not be described in detail here.

[0067] When welding the cracks on the base of the wind turbine cabin, determine the severity of the oil pollution on the surface of the crack, and choose to use flame spraying and cleaning methods to clean it according to the actual oil pollution status. After completing the oil pollution treatment work on the surface of the base, the construction personnel will open a groove on the crack and use a welding device to weld the crack.

[0068] Further as Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12As shown, it is worth explaining in detail that the cleaning unit 3 includes a flame-spraying mechanism 3a and a cleaning mechanism 3b, wherein the flame-spraying mechanism 3a includes: a movable plate 3a1, the movable plate 3a1 is slidably connected to one side of the mounting frame 2, the angle between the movable plate 3a1 and the mounting frame 2 is a right angle, a first mounting frame 3a2 is fixed to one side of the movable plate 3a1, a first mounting frame 3a2 is slidably connected to one side of the first mounting frame 3a2, a first rotating frame 3a4 is fixed to one side of the first loading plate 3a3, a second rotating frame 3a6 is rotatably connected to one side of the first rotating frame 3a4 through a first rod 3a5, when the second rotating frame 3a6 is subjected to force, it flips along the central axis of the first rod 3a5, so that it is more stable and smooth when spraying fire on the cracks of the base, and the central axis of the first rotating frame 3a4 is fixed to the first loading frame 3a4. The first rotating frame 3a4 is collinearly arranged with the central axis of the first rod body 3a5, and the central axis of the first rotating frame 3a4 is collinearly arranged with the central axis of the second rotating frame 3a6. The first rotating frame 3a4 and the second rotating frame 3a6 are both arranged on an arc surface. The top surface of the second rotating frame 3a6 is connected with a flamethrower 3a8 through a positioning frame 3a7. A limiting groove 10 adapted to the flamethrower 3a8 is provided on one side of the positioning frame 3a7. Through the setting of the limiting groove 10, when the flamethrower 3a8 needs to be installed and used, the flamethrower 3a8 is inserted into the limiting groove 10 to realize the installation of the flamethrower 3a8, effectively saving the physical labor of removing the oil stains on the cracked surface of the base, and the deep oil stains on the surface of the cabin base are burned and evaporated by the flamethrower 3a8;

[0069] Fuel tank 3a9, fuel tank 3a9 is arranged on one side of the chassis 1, fuel tank 3a9 is fixed to the chassis 1 through an L-shaped plate, and a fuel inlet for convenient filling is arranged on the top surface of fuel tank 3a9, and a connecting pipe 3a10 is fixed between the flamethrower 3a8 and the fuel tank 3a9, and the pipe is a stainless steel bellows, which is made of high-quality stainless steel 304 or 304L material, has strong anti-aging performance, good corrosion resistance, and long safe service life. In addition, the stainless steel bellows has good flexibility and excellent bending performance, which can reduce connection leakage points.

[0070] It should be noted that, after confirming the state of the oil stains at the cracks of the base, the flame-spraying mechanism 3a is used to spray the oil stains at the cracks of the base to heat the oil stains so as to achieve the purpose of evaporating and burning the oil stains. By pushing the first bearing plate 3a3, the first bearing plate 3a3 slides along the inner side of the first mounting frame 3a2 after being subjected to force, and the first bearing plate 3a3 is moved to the dead point of the first mounting frame 3a2. The flame-spraying gun 3a8 is used to burn the surface of the cracks of the base. When reciprocating up and down spraying is required, the flame-spraying gun 3a8 is manually swung to swing, so that the second rotating frame 3a6 rotates along the central axis of the first rod body 3a5 after being subjected to force. The damping effect of the damper 9 is used to increase the resistance when swinging the flame-spraying gun 3a8, thereby improving the working stability of the flame-spraying gun 3a8.

[0071] Further as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Fig.10 As shown, it is worth specifically explaining that the lifting unit 4 includes a guide rod 401, which is fixed to one side of the mounting frame 2, and a screw rod 402 is connected to the mounting frame 2 and the base frame 1 for common rotation. The diameter of the guide rod 401 is consistent with the diameter of the screw rod 402, and the guide rod 401 and the screw rod 402 are symmetrically distributed on both sides of the movable plate 3a1, so as to ensure that the movable plate 3a1 can perform smooth lifting and lowering movements after being subjected to the thread transmission force, one side of the movable plate 3a1 is threadedly connected to the screw rod 402, and the other side of the movable plate 3a1 is slidably penetrated by the guide rod 401, a driving motor 403 is fixed to one side of the mounting frame 2, and a bevel gear 404 is fixed between the output shaft of the driving motor 403 and the screw rod 402, and the two bevel gears 404 are meshed and connected with each other.

[0072] It should be noted that through the driving function of the motor and combined with the precise meshing transmission of the two bevel gears 404, the lead screw 402 is effectively driven to operate smoothly, and the threaded transmission between the lead screw 402 and the movable plate 3a1 is utilized to enable the movable plate 3a1 to achieve precise lifting and lowering adjustment. The adjustment mechanism of the lifting unit 4 enables the height position of the components of the cleaning unit 3 to be flexibly adjusted, so as to adapt to and meet the work requirements of cleaning cracks at different heights, which not only improves the efficiency of cleaning the cracks at the base, but also enhances the applicability and flexibility of the equipment, so that the operator can quickly adjust the height of the equipment according to the actual cleaning task requirements to achieve the best cleaning effect.

[0073] When cleaning the oil stains on the cracks of the base, the components of the cleaning unit 3 are adjusted by the lifting assembly. When it is necessary to clean the cracks on the left and right sides of the base of the wind turbine cabin, the device can be pushed to move. The universal wheels 11 added to the bottom can be used to push the device to move in the surrounding area of ​​the base, so that the oil stains on the surface of the cracks at different positions can be cleaned.

[0074] In this scheme, when welding the cracks on the base of the wind turbine nacelle, the welding principle for the cracks on the base of the wind turbine nacelle is as follows:

[0075] First, confirm the surface oil stain condition of the cracked part of the base, push the device to a suitable working position, pull the first carrier plate 3a3 backward, and use the toothed groove 604 and the spur gear 603 to mesh and drive, so that the second carrier plate 3b2 moves forward. When the second carrier plate 3b2 moves to a suitable position, the detergent in the water storage tank 3b13 is extracted by the first water pipe 3b15 by the drive of the water pump 3b14, and the pressurized detergent is input into the water tank 3b13 through the second water pipe 3b16. To the water spray pipe 3b11, and then the cleaning agent is sprayed to the crack surface of the base by the nozzle 3b12, and the cleaning agent decomposes the oil on the surface of the base. After the oil is decomposed, the connecting frame 3b5 is driven by the electric push rod 3b10 to rotate along the axis of the rotating rod 3b4 after being subjected to force until the brush roller 3b6 contacts the crack surface of the base, and the brush roller 3b6 is driven to rotate by the servo motor 3b7, and the crack of the base is cleaned by the brush roller 3b6;

[0076] Secondly, when the height position of the crack treatment location needs to be adjusted, the drive motor 403 is driven to utilize the meshing transmission between the two bevel gears 404 to make the screw rod 402 rotate synchronously, and the threaded transmission between the screw rod 402 and the movable plate 3a1 is utilized to cause the movable plate 3a1 to be lifted and lowered smoothly along the surface of the guide rod 401 and the inner side of the mounting frame 2 after being subjected to force, thereby achieving the smooth driving movement of the flame spraying mechanism 3a and the cleaning mechanism 3b;

[0077] Then, when the welding tongs or polisher is mounted on the hook 505, the traction rope 504 is pulled to move, thereby driving the winding drum 503 to operate, and the meshing transmission between the pawl 5a2 and the ratchet wheel 5a1 is used to achieve the purpose of automatically engaging and limiting the winding drum 503. When the limit of the winding drum 503 needs to be released, the pull ring 5a8 is pulled to release the limit of the winding drum 503, causing the torsion spring 507 to release its elastic force and automatically rebound to reset the winding drum 503.

[0078] Finally, when the engagement limit of the pawl 5a2 and the ratchet 5a1 needs to be released, the pull ring 5a8 is pulled to make the pull rod 5a7 move synchronously. At this time, the reset spring 5a9 is in a stretched state. The transmission force of the connecting rod 5a11 is used to cause the transmission frame 5a4 to flip along the center rod 5a3 after being forced, and the traction between the transmission frame 5a4 and the pawl 5a2 is used to cause the pawl 5a2 to flip after being forced, thereby releasing the limit on the winding drum 503, thereby achieving the purpose of automatically winding the rope 504. Embodiment 2:

[0079] Based on the first embodiment, according to Figure 1 , Figure 2 , Figure 6 , Figure 7 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, the difference lies in that the cleaning unit 3 is optimized and a cleaning mechanism 3b component is added to clean the cracks on the base.

[0080] Further as Figure 1 , Figure 2 , Figure 6 , Figure 7 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, it is worth specifically explaining that the cleaning mechanism 3b includes: a second mounting frame 3b1, the second mounting frame 3b1 is fixed to one side of the movable plate 3a1, the second mounting frame 3b1 is slidably connected to the inner side of the second mounting frame 3b1, a bracket 3b3 is fixed to one side of the second bearing plate 3b2, the vertical cross-section of the bracket 3b3 is L-shaped, and the angle between the bracket 3b3 and the second bearing plate 3b2 is right-angled, one side of the bracket 3b3 is rotatably connected to a connecting frame 3b5 through a rotating rod 3b4, and the connecting frame One side of 3b5 is rotatably connected with a brush roller 3b6, the brush material of the brush roller 3b6 is a hard brush, which has a good effect on cleaning the oil stains on the cracked surface of the base, and one side of the connecting frame 3b5 is fixed with a servo motor 3b7 coaxially fixed with the brush roller 3b6, and the servo motor 3b7 accurately controls the speed of the brush roller 3b6, drives the brush roller 3b6 to rotate and can clean the oil stain layer on the cracked surface of the base, and drives the brush roller 3b6 to rotate through the servo motor 3b7 to clean the welding part of the cabin base;

[0081] Two hinged seats 3b8, the two hinged seats 3b8 are fixed on one side of the second bearing plate 3b2, one side of the connecting frame 3b5 is rotatably connected with a transmission rod 3b9, and two electric push rods 3b10 are hinged between the transmission rod 3b9 and the two hinged seats 3b8, and the connecting frame 3b5 is driven to rotate along the axis of the rotating rod 3b4 by the electric push rod 3b10;

[0082] The water spray pipe 3b11 is arranged on one side of the second supporting plate 3b2. The water spray pipe 3b11 is made of hard metal material. The cleaning agent is transported by the water spray pipe 3b11, so as to ensure sufficient stability when spraying the cleaning agent. A nozzle 3b12 is fixed on one side of the water spray pipe 3b11, a water storage tank 3b13 is fixed on one side of the bottom frame 1, a water pump 3b14 is fixed on the outside of the water storage tank 3b13, and a connecting piece is fixed between the input end of the water pump 3b14 and the water storage tank 3b13. The first water pipe 3b15 is made of the same material as the water spray pipe 3b11, both of which are hard materials. A second water pipe 3b16 is fixedly connected between the output end of the water pump 3b14 and the water spray pipe 3b11. The second water pipe 3b16 is made of a soft and stretchable material to ensure that the water spray pipe 3b11 can be stretched and lifted when its height is raised or lowered. A transmission member 6 compatible with the first bearing plate 3a3 and the second bearing plate 3b2 is provided on one side of the movable plate 3a1.

[0083] It should be noted that the transmission member 6 includes: a groove 601, the groove 601 is opened on one side of the movable plate 3a1, a rotating shaft 602 is rotatably connected in the groove 601, two spur gears 603 are fastened and sleeved on the outer surface of the rotating shaft 602, the diameter size value of the spur gear 603 is greater than the opening length value of the groove 601, a toothed groove 604 is opened on one side of the first carrier plate 3a3 adjacent to the second carrier plate 3b2, the spur gear 603 is meshed and connected with the toothed groove 604, and through the meshing mechanism of the spur gear 603 and the toothed groove 604, when the first carrier plate 3a3 is pushed forward, the spur gear 603 and the toothed groove The meshing action between 604 enables the second supporting plate 3b2 to move in the opposite direction after being subjected to the corresponding force. The design cleverly realizes the function of driving the flame-spraying mechanism 3a to move backward while the cleaning mechanism 3b moves forward. Vice versa, when the cleaning mechanism 3b moves backward, it can also drive the flame-spraying mechanism 3a to move forward. This two-way motion conversion mechanism not only effectively avoids the mechanism interference problem that may occur during use, ensures safe and stable operation during use, but also greatly simplifies the operation process, allowing users to use it more easily and conveniently.

[0084] Specifically, a guide wheel 7 is fixed on one side of the first carrier plate 3a3 and the second carrier plate 3b2, and the surface of the guide wheel 7 is set to be smooth. A guide groove 8 is opened on one side of the first installation frame 3a2 and the second installation frame 3b1, and the guide wheel 7 is slidably connected to the guide groove 8. When the first carrier plate 3a3 and the second carrier plate 3b2 move, the guide wheel 7 slides smoothly in the specific guide groove 8 to ensure that the first carrier plate 3a3 and the second carrier plate 3b2 can move smoothly in a staggered manner, so that the two carrier plates always maintain a relatively smooth and stable state during the movement, thereby effectively avoiding the jamming phenomenon that may occur during the movement. This component not only improves the operating efficiency of the flamethrower mechanism 3a and the cleaning mechanism 3b, but also ensures the stability and safety of the operation.

[0085] Embodiment three:

[0086] See also Figure 1 , Figure 4 , Figure 5 and Figure 6 This embodiment further describes other embodiments, and the difference lies in the development of one specific implementation of the auxiliary component 5.

[0087] Further as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, it is worth specifically explaining that the auxiliary component 5 includes: an additional frame 501, the additional frame 501 is fixed to one side of the mounting frame 2, one side of the additional frame 501 is rotatably connected to a shaft 502, the outer surface of the shaft 502 is tightly sleeved with a winding drum 503, the surface of the winding drum 503 is wound with a rope 504, one end of the rope 504 is fixed with a hook 505, and the hook 505 is used to mount a welding clamp or a polisher;

[0088] The connecting ring 506 is tightly sleeved on the outer surface of the shaft body 502. A torsion spring 507 is sleeved on the surface of the shaft body 502. Both ends of the torsion spring 507 are respectively fixed to the mounting frame 501 and one side of the connecting ring 506. A limiting piece 5a adapted to the shaft body 502 is provided on one side of the mounting frame 2.

[0089] It should be noted that, through the setting of the auxiliary component 5, various tools such as polishers, welding tongs, etc. can be conveniently mounted by using the additional hooks 505 to improve work efficiency. When the tools are mounted on these hooks 505, once the hooks 505 are pulled by external force, the ropes 504 connected thereto will move synchronously. The torsion spring 507 plays a key role, causing the ropes 504 to deform accordingly when they move. When the tools are used, only the pulling force needs to be released, and the torsion spring 507 will release the elastic force stored before, automatically rolling up the ropes 504. Such a design not only improves the convenience of mounting the tools, but also ensures the stability and safety of the tools during use. At the same time, it also simplifies the storage and management process of the tools, making the entire work process more efficient and orderly, and effectively solving the problem of inconvenient storage and management of the tools due to the mess.

[0090] The limiting member 5a includes: a ratchet 5a1, which is tightly sleeved on the outer surface of the shaft body 502; a pawl 5a2 is rotatably connected to one side of the mounting frame 501; the pawl 5a2 is engaged with the ratchet 5a1; when the pawl 5a2 is engaged with the ratchet 5a1, the rotation limiting state of the winding drum 503 is realized; the engagement limiting of the shaft body 502 is realized by the engagement of the pawl 5a2 with the ratchet 5a1; a center rod 5a3 is rotatably connected to one side of the mounting frame 2; a transmission frame 5a4 is tightly sleeved on the outer surface of the center rod 5a3; the transmission frame 5a4 is rotatably connected to the pawl 5a2 through the second rod body 5a5;

[0091] Loading frame 5a6, loading frame 5a6 is fixed on one side of mounting frame 2, the angle between loading frame 5a6 and mounting frame 2 is set at right angle, a pull rod 5a7 is slidably passed through one side of loading frame 5a6, a pull ring 5a8 is fixed on one end of pull rod 5a7, and a return spring 5a9 is sleeved on the outer surface of pull ring 5a8, one end of return spring 5a9 is fixed to one side of loading frame 5a6, a mounting ring 5a10 fixed with return spring 5a9 is tightly sleeved on the outer surface of pull rod 5a7, a connecting rod 5a11 is hinged between one end of pull rod 5a7 and transmission frame 5a4.

[0092] It should be noted that when the pull ring 5a8 is pulled by an external force, the pull rod 5a7 connected to it is driven to move synchronously. In this process, the reset spring 5a9 is stretched and in a tensioned state. At the same time, through the transmission action of the connecting rod 5a11, the transmission frame 5a4 rotates after being subjected to force, causing it to flip along the axis of the center rod 5a3. This flipping action will further pull the pawl 5a2 to flip it, thereby releasing the engagement limit of the ratchet 5a1. At this time, the torsion spring 507 will release its stored elastic force, thereby driving the winding drum 503 to rotate and reeling in the rope 504. When the traction rope 504 is pulled to an appropriate length, the pawl 5a2 will automatically re-engage with the ratchet 5a1 to complete the limitation of the winding drum 503. If you need to release the limitation of the winding drum 503, you only need to pull the pull ring 5a8 again to easily release the limitation of the winding drum 503.

[0093] In this solution: a wind turbine nacelle base crack welding device and method, comprising the following steps:

[0094] S1. Surface oil treatment: First, the oil on the cracks of the generator cabin base needs to be removed. When cleaning shallow oil, the cleaning agent is sprayed onto the cracks through the cleaning mechanism 3b, and the cleaning agent decomposes the oil on the surface of the base. After the oil is decomposed, the brush roller 3b6 cleans the surface of the base. When deep oil needs to be cleaned, the flame spraying mechanism 3a is used to heat the deep oil on the surface of the base to evaporate or burn the oil;

[0095] S2. Bevel treatment: Bevel the crack edge of the base to ensure that the weld can fully bite. The bevel depth is controlled at 2-3 mm to ensure that the welding rod can weld successfully in one time. Stop holes are made at both ends of the crack to prevent stress from being generated during welding.

[0096] S3. Select welding rods: Use Amelloy 440 cast iron welding rods, whose welds can meet the mechanical strength and ductility required for ductile iron welding. Adjust the welding current of the welding device according to the type of welding rod. Before welding, test the current with scrap iron plates to reduce heat output and ensure a stable molten pool.

[0097] S4, welding operation: during the welding process, take the welding clamp mounted on the hook 505, keep the weld narrow and avoid large swings, perform jump welding in sections according to the length of the crack, tap to release stress after each welding, and continue welding the next section after cooling;

[0098] S5. Appearance inspection:

[0099] (1) After welding, the weld needs to be inspected for 100% appearance. The acceptance standard for arc pits, pores, lack of fusion and undercut defects on the weld surface is GB / T11345-2013 and reaches quality grade B;

[0100] (2) The weld excess height shall not exceed 10% of the weld width and the maximum shall not exceed 5 mm. The repaired position shall be polished to be flush with the parent material and subjected to non-destructive testing to meet the requirements.

[0101] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0102] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crack welding device for a nacelle base of a wind turbine generator set, comprising a welding device arranged on one side of a base frame (1), and the welding device is equipped with a welding clamp; It is characterized in that Also includes: The mounting frame (2) is fixed to the top surface of the base frame (1), and a cleaning unit (3) is provided on one side of the mounting frame (2). The cleaning unit (3) is used to clean oil stains on the surface of the cabin base, and the cleaning unit (3) comprises a flame spraying mechanism (3a) and a cleaning mechanism (3b), wherein the flame spraying mechanism (3a) comprises: A movable plate (3a1), the movable plate (3a1) is slidably connected to one side of the mounting frame (2), a first mounting frame (3a2) is fixed to one side of the movable plate (3a1), a first bearing plate (3a3) is slidably connected to one side of the first mounting frame (3a2), a first rotating frame (3a4) is fixed to one side of the first bearing plate (3a3), one side of the first rotating frame (3a4) is rotatably connected to a second rotating frame (3a6) via a first rod body (3a5), a flamethrower (3a8) is connected to the top surface of the second rotating frame (3a6) via a positioning frame (3a7), and deep oil stains on the surface of the cabin base are burned and evaporated by the flamethrower (3a8); A fuel tank (3a9), the fuel tank (3a9) being arranged on one side of the base frame (1), and a communicating pipe (3a10) being fixed between the flamethrower (3a8) and the fuel tank (3a9); In addition, the cleaning mechanism (3b) comprises: A second mounting frame (3b1), the second mounting frame (3b1) being fixed to one side of the movable plate (3a1), the inner side of the second mounting frame (3b1) being slidably connected to a second bearing plate (3b2), one side of the second bearing plate (3b2) being fixed to a bracket (3b3), one side of the bracket (3b3) being rotatably connected to a connecting frame (3b5) via a rotating rod (3b4), one side of the connecting frame (3b5) being rotatably connected to a brush roller (3b6), and one side of the connecting frame (3b5) being fixed to a servo motor (3b7) coaxially fixed with the brush roller (3b6), the servo motor (3b7) driving the brush roller (3b6) to rotate to clean the welding portion of the cabin base; Two hinged seats (3b8), the two hinged seats (3b8) are fixed to one side of the second bearing plate (3b2), one side of the connecting frame (3b5) is rotatably connected to a transmission rod (3b9), two electric push rods (3b10) are hingedly connected between the transmission rod (3b9) and the two hinged seats (3b8), and the connecting frame (3b5) is driven to rotate along the axis of the rotating rod (3b4) by the electric push rods (3b10); A water spray pipe (3b11), the water spray pipe (3b11) is arranged on one side of the second bearing plate (3b2), a spray head (3b12) is fixed on one side of the water spray pipe (3b11), a water storage tank (3b13) is fixed on one side of the base frame (1), a water pump (3b14) is fixed outside the water storage tank (3b13), a first water pipe (3b15) connected to the water storage tank (3b13) is fixed between the input end of the water pump (3b14), a second water pipe (3b16) connected to the water spray pipe (3b11) is fixed between the output end of the water pump (3b14) and the water spray pipe (3b11), and a transmission member (6) adapted to the first bearing plate (3a3) and the second bearing plate (3b2) is arranged on one side of the movable plate (3a1); A lifting unit (4) is provided on one side of the mounting frame (2) and is used to drive the cleaning unit (3) to lift. An auxiliary component (5) is provided on one side of the mounting frame (2) and can be used to mount a welding clamp and a grinder. The lifting unit (4) comprises: A guide rod (401) is fixed to one side of the mounting frame (2); a screw rod (402) is rotatably connected between the mounting frame (2) and the base frame (1); one side of the movable plate (3a1) is threadedly connected to the screw rod (402); and the other side of the movable plate (3a1) is slidably connected to the guide rod (401); a driving motor (403) is fixed to one side of the mounting frame (2); a bevel gear (404) is fixed between the output shaft of the driving motor (403) and the screw rod (402); and the two bevel gears (404) are meshed and connected with each other.

2. A wind turbine nacelle base crack welding device according to claim 1, characterized in that: The auxiliary component (5) comprises: An additional frame (501), the additional frame (501) is fixed to one side of the mounting frame (2), one side of the additional frame (501) is rotatably connected to a shaft (502), an outer surface of the shaft (502) is tightly sleeved with a winding drum (503), a surface of the winding drum (503) is wound with a rope (504), one end of the rope (504) is fixed with a hook (505), and the hook (505) is used to mount a welding clamp or a polisher; A connecting ring (506) is tightly sleeved on the outer surface of the shaft body (502), a torsion spring (507) is sleeved on the surface of the shaft body (502), two ends of the torsion spring (507) are respectively fixed to the mounting frame (501) and one side of the connecting ring (506), and a stopper (5a) adapted to the shaft body (502) is provided on one side of the mounting frame (2).

3. A wind turbine nacelle base crack welding device according to claim 2, characterized in that: The limiting member (5a) comprises: A ratchet (5a1), the ratchet (5a1) is tightly sleeved on the outer surface of the shaft body (502), a pawl (5a2) is rotatably connected to one side of the mounting frame (501), the pawl (5a2) is engaged with the ratchet (5a1), and the engagement of the pawl (5a2) with the ratchet (5a1) is used to limit the engagement of the shaft body (502), a center rod (5a3) is rotatably connected to one side of the mounting frame (2), a transmission frame (5a4) is tightly sleeved on the outer surface of the center rod (5a3), and the transmission frame (5a4) is rotatably connected to the pawl (5a2) via a second rod body (5a5); A loading frame (5a6), the loading frame (5a6) is fixed to one side of the mounting frame (2), a pull rod (5a7) is slidably passed through one side of the loading frame (5a6), a pull ring (5a8) is fixed to one end of the pull rod (5a7), and a return spring (5a9) is sleeved on the outer surface of the pull ring (5a8), one end of the return spring (5a9) is fixed to one side of the loading frame (5a6), a mounting ring (5a10) fixed to the return spring (5a9) is tightly sleeved on the outer surface of the pull rod (5a7), and a connecting rod (5a11) is hinged between one end of the pull rod (5a7) and the transmission frame (5a4).

4. The wind turbine generator nacelle base crack welding equipment according to claim 1, characterized in that: The transmission member (6) comprises: A groove (601) is provided on one side of the movable plate (3a1), a rotating shaft (602) is rotatably connected in the groove (601), two spur gears (603) are tightly sleeved on the outer surface of the rotating shaft (602), a toothed groove (604) is provided on one side of the first supporting plate (3a3) adjacent to the second supporting plate (3b2), and the spur gears (603) are meshingly connected with the toothed groove (604).

5. The wind turbine generator nacelle base crack welding equipment according to claim 1, characterized in that: A guide wheel (7) is fixed on one side of the first bearing plate (3a3) and the second bearing plate (3b2); a guide groove (8) is provided on one side of the first mounting frame (3a2) and the second mounting frame (3b1); the guide wheel (7) is slidably connected in the guide groove (8); the vertical cross-sections of the first bearing plate (3a3) and the second bearing plate (3b2) can be arranged in an I-shaped shape; the length of the first mounting frame (3a2) is consistent with the length of the second mounting frame (3b1).

6. The wind turbine generator nacelle base crack welding equipment according to claim 1, characterized in that: The first rotating frame (3a4) and the second rotating frame (3a6) are both arranged on an arc surface on one side thereof; two dampers (9) are hingedly connected between the first rotating frame (3a4) and the second rotating frame (3a6); a limiting groove (10) adapted to the flamethrower (3a8) is provided on one side of the positioning frame (3a7); the central axis of the first rotating frame (3a4) and the central axis of the first rod body (3a5) are arranged in a collinear manner; and the central axis of the first rotating frame (3a4) and the central axis of the second rotating frame (3a6) are arranged in a collinear manner.

7. The wind turbine generator nacelle base crack welding equipment according to claim 1, characterized in that: A plurality of universal wheels (11) are fixed to one side of the base frame (1), a storage box (12) is provided on one side of the base frame (1), a mounting sleeve (13) is fixed to one side of the mounting frame (2), and a storage box (14) is inserted into the mounting sleeve (13).

8. A welding method for the crack welding equipment of the nacelle base of a wind turbine generator set based on any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Surface oil stain treatment: First, the oil stain on the cracks of the generator cabin base needs to be removed. When cleaning shallow oil stains, the cleaning agent is sprayed onto the cracks through the cleaning mechanism (3b), and the cleaning agent decomposes the oil stains on the surface of the base. After the oil stains are decomposed, the brush roller (3b6) cleans the surface of the base. When cleaning deep oil stains, the flame spray mechanism (3a) is used to heat the deep oil stains on the surface of the base to achieve the purpose of evaporating or burning the oil stains. S2. Bevel treatment: Bevel the crack edge of the base to ensure that the weld can fully bite. The bevel depth is controlled at 2-3 mm to ensure that the welding rod can weld successfully in one time. Stop holes are made at both ends of the crack to prevent stress from being generated during welding. S3. Select welding rods: Use Amelloy 440 cast iron welding rods, whose welds can meet the mechanical strength and ductility required for ductile iron welding. Adjust the welding current of the welding device according to the type of welding rod. Before welding, test the current with scrap iron plates to reduce heat output and ensure a stable molten pool. S4, welding operation: During the welding process, take the welding clamp mounted on the hook (505), keep the weld narrow and avoid large swings, and perform jump welding in sections according to the length of the crack. After each welding, tap to release stress, and continue welding the next section after cooling. S5. Appearance inspection: (1) After welding, the weld needs to be inspected for 100% appearance. The acceptance standard for arc pits, pores, lack of fusion and undercut defects on the weld surface is GB / T11345-2013 and reaches quality grade B; (2) The weld excess height shall not exceed 10% of the weld width and the maximum shall not exceed 5 mm. The repaired position shall be polished to be flush with the parent material and subjected to non-destructive testing to meet the requirements.

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