Tower exterior construction device of large wind turbine generator tower drum

Abstract

The invention relates to the technical field of tower drum construction, and discloses an out-of-tower construction device for a large wind turbine generator tower drum, which comprises a crawling frame and a plurality of tower drum units capable of being modularly spliced, and further comprises a first spacing adjusting mechanism mounted on the crawling frame, two clamping arms which are symmetrically arranged and have an adjustable spacing are in transmission connection with the first spacing adjusting mechanism, and a second spacing adjusting mechanism mounted on the crawling frame, each clamping arm is provided with two walking frames with the distance adjustable, each walking frame is provided with a first transmission module, the first transmission module is in transmission connection with an annular walking crawler belt, the crawling frame is provided with a guide frame, the guide frame is provided with an upper arm and a lower arm in a lifting mode, and the guide frame is rotationally provided with two limiting guide wheels. According to the invention, stable movement of the crawling frame, flexible height adjustment and accurate grabbing transportation and calibration welding of the tower drum during out-of-tower construction of the large wind turbine generator tower drum are realized, the wind resistance and clamping anti-skid adaptability are enhanced, and the construction efficiency, precision and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of tower construction technology, and more specifically, to an external construction device for large wind turbine towers. Background Technology

[0002] During tower assembly, multiple tower sections are sequentially hoisted and assembled into a whole. Then, anchoring devices are used to connect and fix each section, forming a unified structure. In the prior art, patent document CN209818217U discloses an external construction device for a large wind turbine tower, including an upper and lower tower section. Its key feature is that an upper positioning mechanism is movably installed at the lower part of the upper tower section, and a lower positioning mechanism is installed at the upper part of the lower tower section. The upper positioning mechanism includes symmetrically arranged upper hoop I and upper hoop II. This device enables rapid assembly and positioning of adjacent upper and lower tower sections, improving assembly efficiency and completely avoiding tower swaying caused by high-altitude wind forces. However, the above device has the following technical problems in use: Traditional equipment has fixed upper and lower arm heights, which cannot be dynamically adjusted according to construction needs. This results in poor adaptability to the installation of tower units of different heights, unstable gripping by the grabbing arm, and easy deviation of tower unit position during transportation. Furthermore, the lack of a real-time pressure feedback mechanism can easily cause damage to the tower surface or installation misalignment. In addition, the verticality, angle calibration, and welding process of tower units in existing technologies are highly dependent on manual operation, resulting in low precision and efficiency, and it is difficult to avoid human error. The mechanical grippers are prone to loosening or overload and crushing under high wind vibration conditions, and they lack adaptive adsorption capabilities, making it difficult to adapt to the slight deformation of different tower surfaces. Based on this, the present invention provides an external construction device for large wind turbine towers to solve the technical problems mentioned in the background art. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides an external construction device for large wind turbine towers. This invention enables stable movement of the climbing frame, flexible height adjustment, precise gripping, transportation, and calibration welding of the tower during external construction of large wind turbine towers. It also enhances wind resistance and gripping anti-slip adaptability, thereby improving construction efficiency, accuracy, and safety.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an external construction device for large wind turbine towers, comprising a climbing frame and multiple modularly connectable tower units, and further comprising: A first spacing adjustment mechanism is installed on a crawler frame. The first spacing adjustment mechanism is driven to have two symmetrically arranged and adjustable-spacing clamping arms. Each clamping arm is equipped with two adjustable-spacing walking frames. Each walking frame is equipped with a first transmission module. The first transmission module is driven to have an annular walking track. The crawler frame is equipped with a guide frame. The guide frame is equipped with an upper arm and a lower arm that can be raised and lowered. Two limit guide wheels are rotatably installed on the guide frame. The second spacing adjustment mechanism is installed on the lower arm. The second spacing adjustment mechanism is driven to connect two symmetrically arranged gripping arms with adjustable spacing. Each of the two gripping arms is fixedly installed with a limiting guide post. The upper arm is slidably connected to two symmetrically arranged calibration arms. The two calibration arms are slidably connected to the two limiting guide posts respectively. Both the calibration arms and the gripping arms are equipped with a power frame. The power frame is equipped with a second transmission module. The second transmission module is driven to connect to an annular clamping belt. A pressure feedback plate is installed on the power frame at a position corresponding to the inner side of the annular clamping belt. The electrical control calibration system is used for calibration during the installation of the tower unit.

[0005] As a preferred embodiment of the present invention, two lead screw lifting modules are installed on the guide frame, and the two lead screw lifting modules are respectively connected to the upper arm and the lower arm. A bidirectional main lead screw is rotatably installed on the clamping arm, and the bidirectional main lead screw is respectively provided with a first positive thread section and a first negative thread section. The first positive thread section and the first negative thread section are respectively connected to two traveling frames on the clamping arm.

[0006] As a preferred embodiment of the present invention, both the first spacing adjustment mechanism and the second spacing adjustment mechanism include a bidirectional auxiliary lead screw and an adjustment motor. The output shaft end of the adjustment motor is fixedly connected to the bidirectional auxiliary lead screw. The bidirectional auxiliary lead screw is respectively provided with a second positive thread section and a second negative thread section. The second positive thread section and the second negative thread section in the first spacing adjustment mechanism are respectively connected to two gripping arms for transmission. The second positive thread section and the second negative thread section in the second spacing adjustment mechanism are respectively connected to two gripping arms for transmission.

[0007] As a preferred embodiment of the present invention, both the first transmission module and the second transmission module include a transmission motor and two transmission wheels. The output shaft of the transmission motor is fixedly connected to one of the transmission wheels via a belt. The two transmission wheels in the first transmission module are connected to an annular walking track for transmission, and the two transmission wheels in the second transmission module are connected to an annular clamping belt for transmission. The axis of the transmission wheel in the first transmission module is perpendicular to the axis of the tower unit, and the axis of the transmission wheel in the second transmission module is parallel to the axis of the tower unit.

[0008] As a preferred embodiment of the present invention, an annular pad is fixedly installed on the annular track. The annular pad is made of silicone and has friction textures evenly distributed on its surface. The thickness of the annular pad is 2 to 5 times the thickness of the annular track.

[0009] As a preferred embodiment of the present invention, the electronic control calibration system includes an electronic control box installed on the upper arm, which houses a microcontroller and a battery. The microcontroller is powered by the battery. A triaxial accelerometer is installed on the lower arm. Two ranging probes, a visual acquisition sensor, and a laser welding torch are respectively installed on the upper arm. The vertical distance between the two ranging probes is 5cm to 25cm. The data terminals of the ranging probes and the visual acquisition sensor are both connected to the microcontroller.

[0010] As a preferred embodiment of the present invention, it further includes an anchoring frame, which has multiple anchoring holes. A winch motor drives a roller to be rotatably mounted on the anchoring frame. A traction rope is wound on the roller. A traction ear is installed on the top of the guide frame. The other end of the traction rope is fixedly connected to the traction ear. A tension sensor connected to a microcontroller is fixedly mounted on the traction rope.

[0011] As a preferred embodiment of the present invention, the annular conveyor belt and the annular pad both include a flexible substrate, multiple sets of electromagnetic coils embedded in the substrate, and an insulating protective layer arranged sequentially from the inside to the outside. The electromagnetic coils are controlled by adjusting the current through a microcontroller to control the adsorption force.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention employs a bidirectional screw adjustment mechanism combining a first spacing adjustment mechanism and a second spacing adjustment mechanism. Combined with the friction texture design of a silicone ring pad, the friction force is increased to three times that of traditional solutions, effectively preventing slippage. The first transmission module drives the ring-shaped walking track to move precisely along the tower axis, while the limiting guide wheel provides real-time constraint on lateral displacement, ensuring a stable and controllable climbing process. The guide frame integrates a screw lifting module, which can independently drive the upper and lower arms to lift, flexibly adapting to the installation requirements of tower units of different heights. The calibration arm slides with the limiting guide column, enabling millimeter-level positional fine-tuning of the gripping arm. This solves the problem of limited construction range in traditional devices. Furthermore, during assembly, this device can achieve positional alignment of two tower units and auxiliary rotation of the tower units to be assembled through electronic control.

[0013] 2. In this invention, the annular clamping belt on the gripping arm adopts an embedded electromagnetic coil design. The adsorption force is dynamically controlled by adjusting the current through a microcontroller, and the clamping pressure is monitored in real time by a pressure feedback plate. This design not only avoids damage to the tower surface, but also instantly increases the adsorption force to 1.5 times the rated value, ensuring clamping reliability under strong winds. The electronic control calibration system integrates a three-axis accelerometer, a distance measuring probe, and a vision acquisition sensor to collect the verticality, angle, and image data of the tower unit in real time. The microcontroller controls the laser welding gun to perform automated calibration and welding. Compared with manual operation, the installation accuracy is improved and the welding efficiency is increased.

[0014] 3. In this invention, an active stabilization system composed of an anchoring frame, a traction rope, and a tension sensor, combined with a microcontroller to adjust the tension of the winch motor in real time, dynamically counteracts the effects of wind load and ensures that the climbing frame maintains a vertical posture. Simultaneously, the limiting guide wheels and traction ears work together to disperse wind vibration loads, completely solving the problems of tower swaying and device slippage in existing technologies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external construction device for the large wind turbine tower of the present invention; Figure 2 This is a schematic diagram of the limiting guide post and crawling frame of the present invention; Figure 3 This is a schematic diagram of the screw lifting module and the annular clamping belt of the present invention; Figure 4 This is a schematic diagram of the screw lifting module and the triaxial accelerometer of the present invention; Figure 5 This is a schematic diagram of the structure of the first transmission module and the walking frame of the present invention; Figure 6 This is a schematic diagram of the structure of the annular feeding belt and the second spacing adjustment mechanism of the present invention; Figure 7 This is a schematic diagram of the calibration arm and power frame of the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0016] In the diagram: 1. Climbing frame; 2. Tower unit; 3. First spacing adjustment mechanism; 4. Clamping arm; 5. Walking frame; 6. First transmission module; 7. Circular walking track; 8. Guide frame; 9. Upper arm; 10. Lower arm; 11. Limiting guide wheel; 12. Second spacing adjustment mechanism; 13. Grabbing arm; 14. Limiting guide post; 15. Calibration arm; 16. Power frame; 17. Second transmission module; 18. Circular clamping belt; 19. Pressure feedback plate; 20. Screw lifting module; 21. Bidirectional main screw; 22. Circular pad; 23. Electrical control box; 24. Three-axis accelerometer; 25. Distance measuring probe; 26. Vision acquisition sensor; 27. Laser welding gun; 28. Anchor frame; 29. ​​Anchor hole; 30. Winch motor; 31. Roller; 32. Traction rope; 33. Traction ear; 34. Tension sensor. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 8 As shown, the present invention provides an external construction device for large wind turbine towers, including a climbing frame 1 and multiple modularly connectable tower units 2, and further comprising: The first spacing adjustment mechanism 3 is installed on the crawling frame 1. The first spacing adjustment mechanism 3 is driven by two symmetrically arranged and adjustable clamping arms 4. Each clamping arm 4 is equipped with two adjustable walking frames 5. Each walking frame 5 is equipped with a first transmission module 6. The first transmission module 6 is driven by a ring walking track 7. A bidirectional main screw 21 is rotatably mounted on the clamping arm 4. The bidirectional main screw 21 is respectively provided with a first positive thread section and a first negative thread section. The first positive thread section and the first negative thread section are respectively connected to the two traveling frames 5 on the clamping arm 4. During the construction of large wind turbine towers outside the tower, the first spacing adjustment mechanism 3 can drive the bidirectional auxiliary lead screw to rotate by adjusting the motor, and use the second positive thread section and the second negative thread section to drive the spacing of the two clamping arms 4 to adjust to accommodate tower units 2 of different diameters. When the bidirectional main lead screw 21 on the clamping arm 4 rotates, its first positive thread section and first negative thread section can change the spacing of the two traveling frames 5, accurately positioning the position of the annular traveling track 7 on the tower. The annular traveling track 7 operates under the drive of the first transmission module 6, driving the entire climbing frame 1 to move along the outer wall of the tower. The annular pad 22 is made of silicone and has a friction texture. Its thickness is 4 times that of the annular walking track 7. It can increase the friction between the track and the tower, prevent the climbing frame 1 from slipping, and improve the stability and safety of the device moving on the tower. It solves the problem that existing construction devices are prone to shaking and slipping during tower climbing. Compared with traditional construction methods, it greatly improves construction efficiency and safety, and ensures that the construction device can climb stably under different working conditions. An annular pad 22 is fixedly installed on the annular track 7. The annular pad 22 is made of silicone and has friction textures evenly distributed on its surface. The thickness of the annular pad 22 is 4 times the thickness of the annular track 7. The annular pad 22 is made of silicone and has a friction texture. Its thickness is 4 times that of the annular walking track 7. It can increase the friction between the track and the tower, prevent the climbing frame 1 from slipping, and improve the stability and safety of the device moving on the tower. It solves the problem that existing construction devices are prone to shaking and slipping during tower climbing. Compared with traditional construction methods, it greatly improves construction efficiency and safety, and ensures that the construction device can climb stably under different working conditions. A guide frame 8 is installed on the crawler frame 1. An upper arm 9 and a lower arm 10 are installed on the guide frame 8 in a height-adjustable manner. Two limit guide wheels 11 are rotatably installed on the guide frame 8. The design of the limiting guide wheel 11 and multiple ring-shaped walking tracks 7 solves the core problems of easy deviation and uneven load of the climbing frame 1 in high-altitude tower construction through the coordinated mechanism of mechanical guidance and power distribution. The limiting guide wheel 11 maintains rolling contact with the outer wall of the tower and constrains the lateral displacement of the climbing frame 1 in real time to ensure that the device climbs vertically along the tower axis. Two lead screw lifting modules 20 are installed on the guide frame 8, and the two lead screw lifting modules 20 are respectively connected to the upper arm 9 and the lower arm 10 for transmission. The second spacing adjustment mechanism 12 is installed on the lower arm 10. The second spacing adjustment mechanism 12 is connected to two symmetrically arranged gripping arms 13 with adjustable spacing. The first spacing adjustment mechanism 3 and the second spacing adjustment mechanism 12 both include a bidirectional auxiliary lead screw and an adjustment motor. The output shaft end of the adjustment motor is fixedly connected to the bidirectional auxiliary lead screw. The bidirectional auxiliary lead screw is respectively provided with a second positive thread section and a second negative thread section. The second positive thread section and the second negative thread section in the first spacing adjustment mechanism 3 are respectively connected to the two clamping arms 4. The second positive thread section and the second negative thread section in the second spacing adjustment mechanism 12 are respectively connected to the two gripping arms 13. The lead screw lifting module 20 on the guide frame 8 drives the upper arm 9 and the lower arm 10 to rise and fall respectively. When installing the tower unit 2, the height of the upper arm 9 and the lower arm 10 can be flexibly adjusted according to the actual construction needs. When it is necessary to grab and calibrate the tower unit 2, the lower arm 10 descends to make the grab arm 13 approach the tower unit 2 to be installed, and the upper arm 9 rises to adjust the position of the calibration arm 15. This design can accurately control the height of each part of the device, adapt to construction operations at different heights, solve the problem that the existing device is difficult to flexibly adjust the height and the construction operation is limited, improve the adaptability of the construction device to different construction scenarios, and make the construction process more convenient and efficient. Each of the two gripping arms 13 is fixedly installed with a limiting guide post 14, and two symmetrically arranged calibration arms 15 are slidably connected to the upper arm 9. The two calibration arms 15 are slidably connected to the two limiting guide posts 14 respectively. A power frame 16 is installed on both the calibration arm 15 and the gripping arm 13. A second transmission module 17 is installed on the power frame 16. An annular clamping belt 18 is connected to the second transmission module 17. A pressure feedback plate 19 is installed on the power frame 16 and at the position corresponding to the inner side of the annular clamping belt 18. The first transmission module 6 and the second transmission module 17 both include a transmission motor and two transmission wheels. The output shaft of the transmission motor is fixedly connected to one transmission wheel via a belt. The two transmission wheels in the first transmission module 6 are connected to the annular walking track 7. The two transmission wheels in the second transmission module 17 are connected to the annular clamping belt 18. The axis of the transmission wheel in the first transmission module 6 is perpendicular to the axis of the tower unit 2. The axis of the transmission wheel in the second transmission module 17 is parallel to the axis of the tower unit 2. The second spacing adjustment mechanism 12 adjusts the spacing between the two gripping arms 13 by adjusting the bidirectional auxiliary lead screw driven by the motor, and using the second positive thread section and the second negative thread section to stabilize the gripping tower unit 2. The limiting guide post 14 on the gripping arm 13 is slidably connected to the calibration arm 15 on the upper arm 9. After gripping the tower unit 2, the position and angle of the tower unit 2 can be adjusted by sliding the calibration arm 15. The second transmission module 17 on the power frame 16 drives the annular clamping belt 18. During the transport of the tower unit 2, the annular clamping belt 18 applies a stable clamping force to the tower unit 2. In conjunction with the pressure feedback plate 19, the clamping pressure is monitored in real time to avoid damaging the tower.

[0019] This effectively solves the problems of positional deviation and unstable clamping that are prone to occur when the existing device grabs and transports the tower unit 2, improves the accuracy and efficiency of the tower unit 2 installation, and reduces safety hazards caused by installation errors; The electrical control calibration system is used for calibration during the installation of tower unit 2.

[0020] The electronic control calibration system includes an electronic control box 23 installed on the upper arm 9. The electronic control box 23 contains a microcontroller and a battery. The microcontroller is powered by the battery. A triaxial accelerometer 24 is installed on the lower arm 10. Two ranging probes 25, a vision acquisition sensor 26, and a laser welding gun 27 are installed on the upper arm 9. The distance between the two ranging probes 25 in the vertical direction is 20cm. The data terminals of the ranging probes 25 and the vision acquisition sensor 26 are both connected to the microcontroller.

[0021] The microcontroller in the electronic control calibration system is powered by a battery. The triaxial accelerometer 24 on the lower arm 10 monitors the attitude changes of the device in real time. The distance measuring probe 25 on the upper arm 9 measures the distance to the tower unit 2 and acquires the image information of the tower unit 2. The vertical distance between the two distance measuring probes 25 is 20cm. By setting the vertical distance between the two distance measuring probes 25, the verticality and angle deviation of the tower unit 2 during installation can be monitored in real time. When assembling the tower unit 2, the two annular conveyor belts 18 can be controlled independently. By controlling the rotation direction and speed of the two annular conveyor belts 18, the tower unit 2 to be assembled can rotate at a set speed and in a set direction, and the tower unit 2 to be assembled can be linearly displaced at a set speed. This enables rapid alignment during the assembly of the two tower units 2; When visual image acquisition is performed, the rotation direction and speed of the two annular conveyor belts 18 are controlled to make the tower unit 2 to be assembled rotate at a set speed, thereby performing all-round visual image acquisition of the tower unit 2. During the assembly of tower unit 2, the tower unit 2 to be assembled is lifted by hoisting equipment; Furthermore, when the two tower units 2 are installed, the alignment of the mounting screw holes of the two tower units 2 can be achieved by driving the rotation of the tower units 2. By controlling the rotation direction and speed difference of the annular clamping belt 18 on the gripping arm 13 and the annular clamping belt 18 on the calibration arm 15, auxiliary straightening can be achieved during the assembly of the non-vertical tower unit 2. The microcontroller controls the operation of the laser welding gun 27 based on these data, and performs precise calibration and welding when installing the tower unit 2. This mechanism solves the problems of low installation and calibration accuracy and difficulty in guaranteeing welding quality in the existing construction process of tower unit 2. It realizes automated and precise calibration and welding, improves the quality and efficiency of tower installation, and reduces the error and labor intensity of manual operation. It also includes an anchor frame 28, which has multiple anchor holes 29. A roller 31 driven by a winch motor 30 is rotatably mounted on the anchor frame 28. A traction rope 32 is wound on the roller 31. A traction ear 33 is installed on the top of the guide frame 8. The other end of the traction rope 32 is fixedly connected to the traction ear 33. A tension sensor 34 connected to the microcontroller is fixedly installed on the traction rope 32.

[0022] Anchoring frame 28 is fixed to the ground or an installed tower section through multiple anchoring holes 29. Hoisting motor 30 drives traction rope 32 to apply dynamic tension to climbing frame 1, forming an active stabilization system against wind swaying. During the operation, tension sensor 34 provides real-time feedback on rope tension. The microcontroller adjusts the rotation speed of roller 31 according to wind load data, so that climbing frame 1 maintains a vertical posture at high altitude. The cooperation between traction ear 33 and limit guide wheel 11 further disperses wind vibration load and prevents the device from overturning. Compared with the traditional passive counterweight scheme, the wind resistance of this scheme is significantly improved, greatly expanding the construction window under complex weather conditions. Both the annular conveyor belt 18 and the annular pad 22 include a flexible substrate, multiple sets of electromagnetic coils embedded in the substrate, and an insulating protective layer arranged sequentially from the inside to the outside. The electromagnetic coils are controlled by adjusting the current through a microcontroller to control the adsorption force.

[0023] The annular clamping belt 18 and the annular pad 22, through the three-layer composite structure design of "flexible substrate electromagnetic coil insulation protection layer", realize adaptive clamping and dynamic anti-slip in high-altitude tower construction. The flexible substrate is made of highly elastic rubber or silicone material, which closely fits the surface of the tower to compensate for minor deformation and unevenness, and avoids coating damage. The grid-like electromagnetic coil is embedded in the substrate, and the current is precisely controlled by a single-chip microcomputer. It can dynamically enhance the adsorption force according to the weight of the tower and the real-time wind load. Under strong wind conditions, the adsorption force can be instantly increased to 1.2 to 1.5 times the rated value, which completely solves the problem that traditional mechanical grippers are easy to loosen or overload and crush in high-altitude wind vibration. Working principle and usage process of this invention: During tower construction, the adjusting motor of the first spacing adjustment mechanism 3 drives the bidirectional auxiliary lead screw to rotate, thereby adjusting the spacing of the clamping arms 4 to accommodate tower units 2 of different diameters. The bidirectional main lead screw 21 on the clamping arms 4 rotates to change the spacing of the traveling frame 5, precisely positioning the annular traveling track 7. The first transmission module 6 drives the annular traveling track 7 to rotate, causing the climbing frame 1 to move along the outer wall of the tower. The annular pad 22 increases friction to prevent the climbing frame 1 from slipping. The lead screw lifting module 20 on the guide frame 8 drives the upper arm 9 and lower arm 10 to rise and fall, adapting to construction operations at different heights. The adjusting motor of the second spacing adjustment mechanism 12 drives the bidirectional auxiliary lead screw to adjust the spacing of the gripping arm 13 to grip the tower unit 2. The limiting guide post 14 on the gripping arm 13 cooperates with the calibration arm 15 to adjust the position and angle of the tower unit 2. The second transmission module... Block 17 drives the annular conveyor belt 18 to clamp the tower unit 2. The pressure feedback plate 19 monitors the clamping pressure. In the electronic control calibration system, the microcontroller is powered by a battery. The triaxial accelerometer 24 monitors the device's attitude changes. The ranging probe 25 measures the distance and acquires image information. It monitors the verticality and angular deviation of the tower unit 2 during installation. The microcontroller controls the laser welding gun 27 for precise calibration and welding. The anchoring frame 28 is fixed through the anchoring hole 29. The winch motor 30 drives the roller 31. The traction rope 32 applies tension to the climbing frame 1. The tension sensor 34 provides feedback on the tension. The microcontroller adjusts the rotation speed of the roller 31 to keep the climbing frame 1 in a vertical position. The electromagnetic coils of the annular conveyor belt 18 and the annular pad 22 are controlled by the microcontroller to adjust the current and control the adsorption force, achieving adaptive clamping and dynamic anti-slip.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external construction device for a large wind turbine tower, comprising a climbing frame (1) and multiple modularly connectable tower units (2), characterized in that, Also includes: The first spacing adjustment mechanism (3) is installed on the crawler frame (1). The first spacing adjustment mechanism (3) is connected to two symmetrically arranged and adjustable clamping arms (4). Each clamping arm (4) is equipped with two adjustable walking frames (5). Each walking frame (5) is equipped with a first transmission module (6). The first transmission module (6) is connected to a ring walking track (7). The crawler frame (1) is equipped with a guide frame (8). The guide frame (8) is equipped with an upper arm (9) and a lower arm (10) that can be raised and lowered. The guide frame (8) is rotatably equipped with two limit guide wheels (11). The second spacing adjustment mechanism (12) is installed on the lower arm (10). The second spacing adjustment mechanism (12) is driven by two symmetrically arranged and adjustable gripping arms (13). Each gripping arm (13) is fixedly installed with a limiting guide post (14). The upper arm (9) is slidably connected to two symmetrically arranged calibration arms (15). The two calibration arms (15) are slidably connected to the two limiting guide posts (14) respectively. Both the calibration arms (15) and the gripping arms (13) are equipped with a power frame (16). The power frame (16) is equipped with a second transmission module (17). The second transmission module (17) is driven by an annular conveyor belt (18). The power frame (16) is equipped with a pressure feedback plate (19) at the position corresponding to the inner side of the annular conveyor belt (18). The electrical control calibration system is used for calibration during the installation of the tower unit (2).

2. The external construction device for large wind turbine towers according to claim 1, characterized in that: Two lead screw lifting modules (20) are installed on the guide frame (8). The two lead screw lifting modules (20) are respectively connected to the upper arm (9) and the lower arm (10). A bidirectional main lead screw (21) is rotatably installed on the clamping arm (4). The bidirectional main lead screw (21) is respectively provided with a first positive thread section and a first negative thread section. The first positive thread section and the first negative thread section are respectively connected to two walking frames (5) on the clamping arm (4).

3. The external construction device for large wind turbine towers according to claim 1, characterized in that: The first spacing adjustment mechanism (3) and the second spacing adjustment mechanism (12) both include a bidirectional auxiliary lead screw and an adjustment motor. The output shaft end of the adjustment motor is fixedly connected to the bidirectional auxiliary lead screw. The bidirectional auxiliary lead screw is respectively provided with a second positive thread section and a second negative thread section. The second positive thread section and the second negative thread section in the first spacing adjustment mechanism (3) are respectively connected to the two clamping arms (4) for transmission. The second positive thread section and the second negative thread section in the second spacing adjustment mechanism (12) are respectively connected to the two gripping arms (13) for transmission.

4. The external construction device for large wind turbine towers according to claim 1, characterized in that: The first transmission module (6) and the second transmission module (17) both include a transmission motor and two transmission wheels. The output shaft end of the transmission motor is fixedly connected to one of the transmission wheels via a belt. The two transmission wheels in the first transmission module (6) are connected to the annular walking track (7) for transmission. The two transmission wheels in the second transmission module (17) are connected to the annular clamping belt (18) for transmission. The axis of the transmission wheel in the first transmission module (6) is perpendicular to the axis of the tower unit (2), and the axis of the transmission wheel in the second transmission module (17) is parallel to the axis of the tower unit (2).

5. The external construction device for large wind turbine towers according to claim 1, characterized in that: An annular pad (22) is fixedly installed on the annular track (7). The annular pad (22) is made of silicone. Friction patterns are evenly distributed on the surface of the annular pad (22). The thickness of the annular pad (22) is 2 to 5 times the thickness of the annular track (7).

6. The external construction device for large wind turbine towers according to claim 1, characterized in that: The electronic control calibration system includes an electronic control box (23) installed on the upper arm (9). The electronic control box (23) contains a microcontroller and a battery. The microcontroller is powered by the battery. A triaxial accelerometer (24) is installed on the lower arm (10). Two ranging probes (25), a visual acquisition sensor (26), and a laser welding gun (27) are installed on the upper arm (9). The distance between the two ranging probes (25) in the vertical direction is 5cm to 25cm. The data terminals of the ranging probes (25) and the visual acquisition sensor (26) are connected to the microcontroller.

7. The external construction device for large wind turbine towers according to claim 1, characterized in that: It also includes an anchor frame (28), which has multiple anchor holes (29). A roller (31) driven by a winch motor (30) is rotatably mounted on the anchor frame (28). A traction rope (32) is wound on the roller (31). A traction ear (33) is installed on the top of the guide frame (8). The other end of the traction rope (32) is fixedly connected to the traction ear (33). A tension sensor (34) connected to the microcontroller is fixedly installed on the traction rope (32).

8. The external construction device for large wind turbine towers according to claim 1, characterized in that: The annular conveyor belt (18) and the annular pad (22) both include a flexible substrate, multiple sets of electromagnetic coils embedded in the substrate and an insulating protective layer arranged sequentially from the inside to the outside. The electromagnetic coils are controlled by adjusting the current through a microcontroller to control the adsorption force.

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