A wind power tower drum circumferential weld seam polishing device

Abstract

The utility model relates to wind power tower drum production technical field discloses a kind of wind power tower drum annular weld polishing device, including rotating frame, swivel and polishing assembly;Wherein, the rotating frame is annularly arranged, the swivel is sleeved in the rotating frame and can rotate around the axis of the rotating frame;Rotary drive mechanism for driving the swivel rotation is provided on the rotating frame;The swivel middle part has through-hole for wind power tower drum to pass through;The polishing assembly is located on the swivel, and the polishing assembly is set to multiple and is distributed along the circumference of the swivel;The polishing assembly includes mounting bracket, polishing wheel, drive wheel and polishing drive mechanism, the mounting bracket is arranged in the swivel inboard, the polishing wheel is rotatably arranged on the mounting bracket, the drive wheel is transmission connection with the polishing wheel, and the polishing drive mechanism is transmission connection with the drive wheel.This patent aims at solving the problem of uneven polishing of annular weld, improving polishing efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine tower production technology, and in particular to a grinding device for the circumferential weld seam of a wind turbine tower. Background Technology

[0002] As the core supporting structure of wind turbine generators, the production process of wind turbine towers encompasses key steps such as CNC cutting, plate rolling, longitudinal seam welding, circumferential seam assembly, flange welding, non-destructive testing, and sandblasting and painting. Due to the large size of the tower and the complex distribution of weld seams, traditional manual grinding is prone to uneven application: the edges of the weld seams are often under-ground due to limited operating space, resulting in residual oxide layers; while flat areas of the tower are over-ground due to tool movement inertia, causing damage to the substrate. This inconsistency in surface treatment quality not only prolongs rework time but also causes differences in coating adhesion after sandblasting, ultimately affecting the structural reliability of the tower under long-term wind load vibration. Utility Model Content

[0003] To address the existing problems, this utility model provides a grinding device for the circumferential weld seam of wind turbine towers. It aims to solve the problem in related technologies that, due to the large volume of wind turbine towers, the grinding force and effect are easily uneven during the grinding process, which affects product quality.

[0004] To achieve the above objectives, the present invention provides the following technical solution.

[0005] A grinding device for circumferential welds of wind turbine towers includes a rotating frame, a rotating ring, and grinding components. The rotating frame is arranged in a ring shape, and the rotating ring is fitted inside the rotating frame and can rotate around the axis of the rotating frame. A rotation drive mechanism for driving the rotating ring to rotate is provided on the rotating frame. The rotating ring has a through hole in its center for the wind turbine tower to pass through. Multiple grinding components are located on the rotating ring and distributed circumferentially along the rotating ring. Each grinding component includes a mounting frame, a grinding wheel, a drive wheel, and a grinding drive mechanism. The mounting frame is located inside the rotating ring, the grinding wheel is rotatably mounted on the mounting frame, the drive wheel is drive-connected to the grinding wheel, and the grinding drive mechanism is drive-connected to the drive wheel.

[0006] As a further improvement of this utility model, the grinding drive mechanism consists of a grinding motor, a grinding drive wheel, and a grinding belt fixed on the rotating ring; wherein, the output end of the grinding motor is connected to the grinding drive wheel, and the grinding belt is sleeved on the grinding drive wheel and the drive wheel to enable the grinding drive wheel and the drive wheel to move together.

[0007] As a further improvement of this utility model, the grinding drive mechanism further includes a grinding tension wheel disposed on the rotating ring, the grinding tension wheel being rotatably disposed on the rotating ring via a rotating shaft; a grinding tension wheel is provided between two adjacent driving wheels; the grinding belt is disposed on the side of the driving wheel facing the center of the rotating ring, and the grinding belt is tensioned on the side of the grinding tension wheel away from the center of the rotating ring.

[0008] As a further improvement of this utility model, it also includes an adjustment mechanism, which is disposed on the rotating ring and is used to adjust the distance between the grinding wheel and the center of the rotating ring.

[0009] As a further improvement of this utility model, the adjusting mechanism includes a threaded cylinder fixed to the outside of the rotating ring, the threaded cylinder being arranged radially along the rotating ring, and a screw being threadedly connected to the inside of the threaded cylinder; the lower end of the screw passes through the threaded cylinder and the rotating ring and is rotatably connected to the upper end of the mounting bracket.

[0010] As a further improvement of this utility model, the lower end of the screw is rotatably connected to the upper end of the mounting bracket via a bearing; a locking nut is threaded onto the upper end of the screw.

[0011] As a further improvement of this utility model, the rotating frame includes a fixed base and a rotating bearing disposed on the fixed base, and the rotating ring is sleeved on the inner ring of the rotating bearing; The rotary drive mechanism includes a rotary drive ring, a rotary drive motor, and a rotary drive wheel; wherein... The two ends of the rotating ring extend out from the two end faces of the rotary bearing, and the grinding wheel and the rotary drive ring are located at the left and right ends of the rotating ring, respectively; The rotating drive ring is fixedly connected to the left end of the rotating ring, the rotating drive motor is driven by the rotating drive wheel, and the rotating drive wheel is connected to the rotating drive ring by a rotating belt.

[0012] As a further improvement of this utility model, it also includes: a rotating tensioning wheel, wherein two rotating tensioning wheels are provided and located above the rotating drive wheel; a support bracket, wherein the support bracket includes a lifting mechanism and an arc-shaped support plate disposed at the upper end of the lifting mechanism, the inner contour of the arc-shaped support plate matching the outer contour of the wind turbine tower.

[0013] As a further improvement of this utility model, a torque sensor is also included, which is used to detect the output torque of the grinding motor.

[0014] As a further improvement of this utility model, it also includes a torque detection module, which is used to detect the current signal of the grinding motor and obtain the estimated torque of the grinding motor based on the current signal.

[0015] This utility model has the following beneficial effects: This solution provides a grinding device specifically designed for circumferential welds on wind turbine towers, featuring a rational structure and ingenious design. Through the coordination of a rotating frame, a rotating ring, and grinding components, the rotating ring can rotate around the axis of the rotating frame, driving multiple circumferentially distributed grinding components to rotate around the wind turbine tower. This achieves comprehensive grinding of the circumferential weld, improving grinding efficiency and quality, and solving the problem of traditional grinding methods' inefficient and incomplete treatment of circumferential welds.

[0016] Preferably, a grinding motor, a grinding drive wheel, and a grinding belt are used for transmission. This structure is simple and reliable, and can stably transmit the power of the grinding motor to the drive wheel, thereby driving the grinding wheel to rotate for grinding operations. This ensures the stability and continuity of the grinding process, and is also easy to install and maintain.

[0017] Preferably, a grinding tension wheel is added, and its position and positional relationship with the grinding belt are reasonably set. A grinding tension wheel is set between two adjacent drive wheels, and the grinding belt is tensioned on the side of the grinding tension wheel away from the center of the rotating ring. This can effectively tension the grinding belt, prevent belt slippage, ensure the stability and accuracy of the grinding drive mechanism transmission, thereby improving the rotational accuracy of the grinding wheel and enhancing the grinding effect.

[0018] Preferably, an adjustment mechanism is added to adjust the distance between the grinding wheel and the center of the rotating ring. This design allows the grinding device to adapt to wind turbine towers of different diameters, improving the device's versatility and flexibility, expanding its application range, and reducing the cost of changing equipment when grinding towers of different specifications.

[0019] Preferably, the adjustment function is achieved through a threaded connection between the threaded cylinder and the screw. This structure is simple and easy to operate; the position of the grinding wheel can be easily changed by rotating the screw, and the threaded connection has a certain degree of self-locking, ensuring the stability of the adjusted position and guaranteeing a stable contact between the grinding wheel and the weld during the grinding process. Preferably, the lower end of the screw is rotatably connected to the upper end of the mounting bracket via a bearing, which reduces the friction when the screw rotates and makes the adjustment process smoother; the upper end of the screw is threaded with a locking nut, which can be used to further fix the screw after the position of the grinding wheel is adjusted, preventing it from loosening during grinding and ensuring the stability and accuracy of grinding.

[0020] Preferably, the rotating frame adopts a structure of fixed seat and rotating bearing, which enables the rotating ring to rotate stably around the axis; the rotating drive mechanism provides power for the rotation of the rotating ring through the cooperation of rotating drive ring, rotating drive motor, rotating drive wheel and rotating belt. The structure is reasonable and the transmission is stable, which can accurately control the rotation speed and direction of the rotating ring, thereby ensuring that the grinding assembly grinds the weld seam evenly.

[0021] Preferably, a rotating tensioning wheel is provided to tension the rotating belt, prevent the rotating belt from slipping, ensure the stability of the rotating drive mechanism, and further improve the accuracy of the rotating ring. The support bracket includes a lifting mechanism and an arc-shaped support plate. The inner contour of the arc-shaped support plate matches the outer contour of the wind turbine tower, which can provide good support for the wind turbine tower. Moreover, the lifting mechanism can adjust the support height according to the tower height or grinding requirements, thereby improving the adaptability and stability of the device.

[0022] Preferably, a torque sensor is added to detect the output torque of the grinding motor in real time. By monitoring torque changes, operators can understand the load during the grinding process in a timely manner. When the torque is abnormal, it can be determined whether there are problems such as grinding wheel jamming or weld abnormalities, so that timely measures can be taken to ensure the safety and quality of the grinding process.

[0023] Optionally, a torque detection module can be added to estimate the torque by detecting the current signal of the grinding motor. This method can indirectly obtain torque information without adding additional complex hardware (such as the installation and cost issues that torque sensors may bring), providing a reference for operators, further enriching the monitoring methods of the grinding process, helping to detect potential problems in a timely manner, and ensuring the smooth progress of grinding operations. Attached Figure Description

[0024] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a cross-sectional view of a wind turbine tower circumferential weld grinding device as described in Example 1; Figure 2 This is a cross-sectional schematic diagram of a wind turbine tower circumferential weld grinding device as described in Example 1; Among them, 1. Rotary ring; 2. Rotating frame; 3. Wind turbine tower; 4. Grinding wheel; 5. Mounting frame; 6. Screw; 7. Grinding belt; 8. Grinding tension wheel; 9. Grinding drive wheel; 10. Rotating tension wheel; 11. Rotating drive wheel; 12. Rotating belt; 13. Lifting mechanism; 14. Arc-shaped support plate; 15. Rotating drive ring; 16. Threaded cylinder; 17. Drive wheel; 18. Rotary ring frame base; 19. Semi-circular rotating ring. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0027] Unless otherwise defined below, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Example 1 This embodiment provides a grinding device for the circumferential weld of a wind turbine tower, including a rotating frame, a rotating ring, and a grinding assembly. The rotating frame is arranged in a ring, and the rotating ring is sleeved inside the rotating frame and can rotate around the axis of the rotating frame. The rotating frame is provided with a rotation drive mechanism for driving the rotating ring to rotate. The rotating ring has a through hole in the middle for the wind turbine tower to pass through. The grinding assembly is located on the rotating ring, and multiple grinding assemblies are arranged and distributed along the circumference of the rotating ring. The grinding assembly includes a mounting frame, a grinding wheel, a drive wheel, and a grinding drive mechanism. The mounting frame is disposed inside the rotating ring, the grinding wheel is rotatably disposed on the mounting frame, the drive wheel is drivenly connected to the grinding wheel, and the grinding drive mechanism is drivenly connected to the drive wheel.

[0029] like Figure 1As shown, the wind turbine tower circumferential weld grinding device includes: a rotating frame 2, a rotating ring 1, and a grinding assembly; wherein, the rotating frame 2 is arranged in a ring, the rotating ring 1 is sleeved inside the rotating frame 2 and can rotate around the axis of the rotating frame 2; the rotating frame 2 is provided with a rotation drive mechanism for driving the rotating ring 1 to rotate; the rotating ring 1 has a through hole in the middle for the wind turbine tower 3 to pass through; the grinding assembly is located on the rotating ring 1, and multiple grinding assemblies are arranged and distributed along the circumference of the rotating ring 1; the grinding assembly includes a mounting frame 5, a grinding wheel 4, a drive wheel 17, and a grinding drive mechanism, the mounting frame 5 is located inside the rotating ring 1, the grinding wheel 4 is rotatably mounted on the mounting frame 5, the drive wheel 17 is drivenly connected to the grinding wheel 4, and the grinding drive mechanism is drivenly connected to the drive wheel 17.

[0030] More specifically, the swivel ring 1 is composed of two semi-circular swivel rings 19 combined by bolt lugs, and the bolt lugs are fixedly connected to the swivel ring bracket 18.

[0031] Specifically, the rotating frame 2 serves as a supporting base and is arranged in a ring shape. The rotating ring 1 is mounted on the rotating frame 2 and rotates around its own axis. The grinding assembly is mounted on the rotating ring 1 and can rotate with the rotating ring 1. The through hole on the rotating ring 1 is used to install the wind turbine tower 3. Specifically, when it is necessary to grind the circumferential weld of the wind turbine tower 3, the wind turbine tower 3 can be passed through the through hole of the rotating ring 1 laterally, so that the circumferential weld corresponds to the position of the grinding assembly. The wind turbine tower 3 is fixed under the action of the supporting device. The wind turbine tower 3 and the rotating ring 1 are arranged coaxially, so that the circumferential weld of the wind turbine tower 3 just contacts the grinding wheel 4.

[0032] like Figure 1 and Figure 2 As shown, multiple grinding components are arranged circumferentially along the rotating ring 1. Each grinding component consists of a mounting frame 5, a grinding wheel 4, a drive wheel 17, and a grinding drive mechanism. The grinding wheel 4 is mounted on the rotating ring 1 via the mounting frame 5 and can rotate synchronously with the rotating ring 1 around the axis of the wind turbine tower 3. Under the action of the grinding drive mechanism and the drive wheel 17, the grinding wheel 4 can rotate around its own axis, thereby achieving the grinding of a weld seam on the outer side of the wind turbine tower 3. Since the rotating ring 1 can drive the grinding wheel 4 to rotate around the axis of the wind turbine tower 3, the entire circumferential weld seam on the outer side of the wind turbine tower 3 can be ground, improving grinding efficiency and grinding uniformity.

[0033] The grinding drive mechanism consists of a grinding motor, a grinding drive wheel, and a grinding belt fixed on the rotating ring; wherein, the output end of the grinding motor is connected to the grinding drive wheel, and the grinding belt is sleeved on the grinding drive wheel and the drive wheel to enable the grinding drive wheel and the drive wheel to move together.

[0034] This embodiment achieves the goal of grinding the weld seam on the outer surface of the wind turbine tower 3 by rotating the grinding wheel 4 while simultaneously grinding the weld seam around the wind turbine tower 3 under the drive of the rotating ring 1. This achieves the technical effect of grinding the weld seam on the surface of the wind turbine tower 3 in a comprehensive and uniform manner, thereby solving the problem in related technologies where the large volume of the wind turbine tower 3 makes it easy for the grinding force and effect to be uneven during the grinding process, which affects product quality.

[0035] The grinding drive mechanism further includes a grinding tension wheel disposed on the rotating ring, the grinding tension wheel being rotatably disposed on the rotating ring via a rotating shaft; there is a grinding tension wheel between two adjacent driving wheels; the grinding belt is disposed on the side of the driving wheel facing the center of the rotating ring, and the grinding belt is tensioned on the side of the grinding tension wheel away from the center of the rotating ring.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the grinding drive mechanism consists of a grinding motor (not shown in the figure, which can be installed at any position on the rotating ring 1, and can be connected to one of the grinding drive wheels 9), a grinding drive wheel 9, and a grinding belt 7, all fixed on the rotating ring 1. The output end of the grinding motor is connected to the grinding drive wheel 9, and the grinding belt 7 is sleeved on the grinding drive wheel 9 and the drive wheel 17 to make the grinding drive wheel 9 and the drive wheel 17 move together.

[0037] Specifically, it should be noted that the rotation of the grinding wheel 4 is powered by a grinding motor, which drives the grinding drive wheel 9 to rotate. Since the grinding drive wheel 9 is connected to the drive wheel 17, and the drive wheel 17 is also connected to the grinding wheel 4, when the grinding drive wheel 9 rotates under the drive of the grinding motor, it can drive the drive wheel 17 to rotate through the grinding belt 7, thereby driving the grinding wheel 4 to rotate. Since all the drive wheels 17 of the grinding wheels 4 in this device are connected through the same grinding belt 7, the rotation speed of each grinding wheel 4 is the same, making the grinding more uniform.

[0038] like Figures 1 to 2 As shown, the grinding drive mechanism also includes a grinding tension wheel 8 disposed on the rotating ring 1. The grinding tension wheel 8 is rotatably disposed on the rotating ring 1 via a rotating shaft; there is a grinding tension wheel 8 between two adjacent drive wheels 17. The grinding belt 7 is located on the side of the drive wheel 17 facing the center of the rotating ring 1, and the grinding belt 7 is tensioned on the side of the grinding tension wheel 8 away from the center of the rotating ring 1.

[0039] Specifically, it should be noted that since the drive wheel 17 and the grinding drive wheel 9 are connected by a belt, a certain tension needs to be applied to the belt. In this embodiment, this is achieved through a grinding tension wheel 8. Since there is a grinding tension wheel 8 between each pair of adjacent drive wheels 17, the tension of the grinding belt 7 is evenly distributed. Because the grinding belt 7 is located on the side of the drive wheel 17 facing the center of the rotating ring 1, and the grinding belt 7 is tensioned on the side of the grinding tension wheel 8 away from the center of the rotating ring 1, the device has a large grinding space, which facilitates the grinding of the circumferential weld of the wind turbine tower 3.

[0040] Furthermore, the wind turbine tower circumferential weld grinding device of this embodiment also includes an adjustment mechanism. The adjustment mechanism is disposed on the rotating ring and is used to adjust the distance between the grinding wheel and the center of the rotating ring. The adjustment mechanism includes a threaded cylinder fixed to the outside of the rotating ring, the threaded cylinder being arranged radially along the rotating ring, and a screw threadedly connected to the inside of the threaded cylinder. The lower end of the screw passes through the threaded cylinder and the rotating ring and is rotatably connected to the upper end of the mounting bracket. The lower end of the screw is rotatably connected to the upper end of the mounting bracket via a bearing; a locking nut is threadedly connected to the upper end of the screw.

[0041] Specifically, such as Figures 1 to 2 As shown, it also includes an adjustment mechanism, which is located on the rotating ring 1 and is used to adjust the distance between the grinding wheel 4 and the center of the rotating ring 1.

[0042] Specifically, it should be noted that since different wind turbine towers 3 have different diameters, there are also different requirements for the distance between the grinding wheel 4 and the wind turbine tower 3. In this embodiment, the distance between the grinding wheel 4 and the wind turbine tower 3 is adjusted by an adjustment mechanism so that it can be adapted to wind turbine towers 3 of different diameters.

[0043] Furthermore, the adjustment mechanism includes a threaded cylinder 16 fixed to the outside of the rotating ring 1. The threaded cylinder 16 is arranged radially along the rotating ring 1, and a screw 6 is threadedly connected to the inside of the threaded cylinder 16. The lower end of the screw 6 passes through the threaded cylinder 16 and the rotating ring 1 and is rotatably connected to the upper end of the mounting bracket 5.

[0044] Specifically, it should be noted that since the screw 6 and the threaded cylinder 16 are connected by a thread, rotating the screw 6 can adjust the length of the lower end of the screw 6 extending out of the threaded cylinder 16. Because the lower end of the screw 6 is rotatably connected to the mounting bracket 5 after extending out of the threaded cylinder 16 and the swivel ring 1, specifically, the lower end of the screw 6 is rotatably connected to the upper end of the mounting bracket 5 via a bearing. Therefore, rotating the screw 6 can adjust the position of the mounting bracket 5, thereby adjusting the distance between the grinding wheel 4 and the wind turbine tower 3. A locking nut is threaded onto the upper end of the screw 6; after the grinding wheel 4 is adjusted to the correct position, the screw 6 can be secured using the locking nut.

[0045] The rotating frame includes a fixed base and a rotating bearing disposed on the fixed base, with the rotating ring sleeved on the inner ring of the rotating bearing; the rotating drive mechanism includes a rotating drive ring, a rotating drive motor, and a rotating drive wheel; wherein, the two ends of the rotating ring extend beyond the two end faces of the rotating bearing, and the grinding wheel and the rotating drive ring are respectively located at the left and right ends of the rotating ring; the rotating drive ring is fixedly connected to the left end of the rotating ring, the rotating drive motor is drivenly connected to the rotating drive wheel, and the rotating drive wheel is connected to the rotating drive ring via a rotating belt.

[0046] Specifically, such as Figures 1 to 2 As shown, the rotating frame 2 includes a fixed base and a rotating bearing mounted on the fixed base. The rotating ring 1 is sleeved on the inner ring of the rotating bearing. The rotating drive mechanism includes a rotating drive ring 15, a rotating drive motor, and a rotating drive wheel 11. The two ends of the rotating ring 1 extend out of the two end faces of the rotating bearing. The grinding wheel 4 and the rotating drive ring 15 are located at the left and right ends of the rotating ring 1, respectively. The rotating drive ring 15 is fixedly connected to the left end of the rotating ring 1. The rotating drive motor is connected to the rotating drive wheel 11 for transmission. The rotating drive wheel 11 and the rotating drive ring 15 are connected by a rotating belt 12.

[0047] Specifically, it should be noted that the rotary drive motor drives the rotary drive wheel 11 to rotate (the structure of the rotary drive motor is not shown in the figure), which in turn drives the rotary drive ring 15 to rotate through the rotary belt 12. Since the rotary drive ring 15 is connected to the rotating ring 1, it can drive the rotating ring 1 to rotate synchronously, and then drive the grinding wheel 4 located on the rotating ring 1 to rotate around the axis of the wind turbine tower 3, so as to achieve uniform and comprehensive grinding of the wind turbine tower 3.

[0048] Furthermore, the wind turbine tower circumferential weld grinding device of this embodiment also includes a rotating tensioning wheel, wherein two rotating tensioning wheels are provided and located above the rotating drive wheel; and a support bracket, wherein the support bracket includes a lifting mechanism and an arc-shaped support plate provided at the upper end of the lifting mechanism, and the inner contour of the arc-shaped support plate matches the outer contour of the wind turbine tower.

[0049] like Figure 1 As shown, the wind turbine tower circumferential weld grinding device of this embodiment also includes a rotating tension wheel 10, which is configured as two and located above the rotating drive wheel 11.

[0050] Furthermore, the wind turbine tower circumferential weld grinding device of this embodiment also includes a support bracket, which includes a lifting mechanism 13 and an arc-shaped support plate 14 disposed on the upper end of the lifting mechanism 13. The inner contour of the arc-shaped support plate 14 matches the outer contour of the wind turbine tower 3. The height of the wind turbine tower 3 can be adjusted by the lifting mechanism 13, which can be made of a jack. The arc-shaped support plate 14 can provide stable support for the wind turbine tower 3.

[0051] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) It also includes a torque sensor, which is used to detect the output torque of the grinding motor.

[0052] 2) It also includes a torque detection module, which is used to detect the current signal of the grinding motor and obtain the estimated torque of the grinding motor based on the current signal.

[0053] In this embodiment, the torque sensor is fixed to the output shaft end of the grinding motor of the grinding drive mechanism. It is used to detect the output torque of the grinding motor in real time and transmit the torque detection signal to an external main controller (such as a PLC controller). The main controller is electrically connected to both the torque sensor and the rotary drive mechanism (rotary drive motor). It can receive the torque detection signal and send speed control commands to the rotary drive mechanism, adjusting the rotation speed of the rotating ring by regulating the output speed of the rotary drive motor. The following control scheme is not within the scope of the claims and is only an example of a possible solution in practical application.

[0054] To achieve load feedback control, the following control parameters are preset. Each parameter is calibrated based on typical grinding conditions of the circumferential weld of the wind turbine tower (e.g., Q345 steel tower, circumferential weld height 3-5mm, weld toe transition angle ≤5°): Torque threshold parameter First threshold T1: The preset standard torque value, corresponding to the grinding load of the standard excess height (3mm) of the ordinary weld zone, preferably 15Nm (can be adjusted according to the tower material and weld specifications). Second threshold T2: Overload torque value greater than the first threshold, corresponding to the thickness excess height of ordinary weld zone (>4mm) or weld bead grinding load, preferably T2=1.1×T1=16.5Nm; The third threshold T3 is the underload torque value that is less than the first threshold. It corresponds to the load when the weld toe transition zone is thin (<2mm) or the grinding wheel is slightly detached from the weld. The preferred value is T3 = 0.8 × T1 = 12 Nm.

[0055] Rotary speed parameters V1: The preset standard rotation speed value, which corresponds to the rotation speed of the ring under the first threshold T1. The preferred value is 0.4m / min, which can ensure the balance between grinding efficiency (material removal rate ≥0.8mm / min) and surface quality in ordinary weld areas. V2: A low-speed value less than V1, corresponding to the overload condition of the second threshold T2. The preferred value is V2 = 0.4 × (T1 / T2) = 0.36 m / min (or directly set to 0.35-0.38 m / min), which is used to extend the grinding contact time in the overload area and avoid incomplete grinding of thick excess material. V3: A high-speed value greater than V1, corresponding to the underload condition of the third threshold T3. The preferred value is V3 = 0.4 × (T1 / T3) = 0.5 m / min (or directly set to 0.48-0.52 m / min), which is used to shorten the grinding contact time in the underload area and avoid over-grinding in the weld toe transition zone.

[0056] The main controller receives the detection signal from the torque sensor in real time and sends the corresponding speed control command to the rotary drive mechanism according to the threshold range of the detected torque. The specific control process is as follows: Standard load control (detected torque T=T1): When the torque sensor detects that the output torque T of the grinding motor is equal to the first threshold T1, the main controller determines that the current condition is the standard grinding condition in the ordinary weld seam area. The main controller sends a speed command to the rotary drive mechanism, controlling the rotary drive motor to run at a standard speed, thereby driving the rotating ring to rotate at a speed of V1=0.4m / min; At this time, the grinding wheel still maintains a uniform rotation speed (such as 1500 rpm), which can achieve efficient and uniform removal of standard residual height.

[0057] Overload control (detected torque T≥T2): When the torque sensor detects that the output torque T of the grinding motor is greater than or equal to the second threshold T2, the main controller determines that it is currently in an overload condition (such as grinding to the thickness or weld bead area). The main controller immediately sends a speed reduction command to the rotary drive mechanism, controlling the rotary drive motor to reduce its speed, so that the rotation speed of the ring switches to V2 (e.g., 0.36 m / min). After the rotating ring speed is reduced, the single grinding contact time of the grinding wheel in the overload area is extended (e.g., when the contact length is 50mm, the contact time is extended from 7.5s to 8.3s). This can completely remove excess thickness or weld beads without increasing the cutting force of the grinding wheel, while avoiding overheating of the grinding motor. When the torque sensor detects that T has fallen back to the range of T1±0.5Nm, the main controller controls the rotation speed of the ring to return to V1.

[0058] Underload control (detection torque T≤T3): When the torque sensor detects that the output torque T of the grinding motor is less than or equal to the third threshold T3, the main controller determines that it is currently in an underload condition (such as grinding to the weld toe transition zone or the grinding wheel slightly disengaging from the weld). The main controller sends an acceleration command to the rotary drive mechanism, controlling the rotary drive motor to increase its speed, so that the rotation speed of the rotating ring switches to V3 (e.g., 0.5m / min). After the swivel speed is increased, the single grinding contact time of the grinding wheel in the underload area is shortened (e.g., when the contact length is 50mm, the contact time is shortened from 7.5s to 6s), which can avoid damage to the base material caused by excessive grinding time in the weld toe transition area, while ensuring a smooth transition between the weld toe and the base material (transition angle ≤5°). When the torque sensor detects that T rises back to the range of T1±0.5Nm, the main controller controls the rotation speed of the ring to return to V1.

[0059] To avoid frequent switching of the rotor speed due to torque fluctuations, the main controller has built-in hysteresis detection logic: When the detected torque drops from above T1, T ≤ T1 - 0.3 Nm is required to trigger the speed to recover from V2 to V1; When the detected torque rises from below T1, T ≥ T1 + 0.3 Nm is required to trigger the speed to recover from V3 to V1; This design can effectively filter out minute fluctuations in torque signals (such as vibration interference within ±0.3Nm), ensuring stable ring speed and avoiding texture breakage or step-like defects on the polished surface.

[0060] Furthermore, it also includes a torque detection module, which is used to detect the current signal of the grinding motor and obtain the estimated torque of the grinding motor based on the current signal; In response to the difference between the estimated torque and the output torque exceeding a threshold, the rotational speed of the rotating ring is controlled based on the comparison results of the estimated torque with the first threshold, the second threshold, and the third threshold. In response to the difference between the estimated torque and the output torque being less than a threshold, the rotational speed of the rotating ring is controlled based on the comparison results of the output torque with the first threshold, the second threshold, and the third threshold.

[0061] Specifically, the main controller first calculates the difference between the output torque and the estimated torque, and compares it with a preset difference threshold. If the difference is less than the threshold (torque detection is reliable), the rotation speed is controlled based on the comparison between the output torque and the "first / second / third torque threshold" (second threshold > first threshold > third threshold): when the output torque matches the first threshold, the rotation speed is the standard speed V1; when it matches the second threshold (overload), it is V2, which is lower than V1; and when it matches the third threshold (underload), it is V3, which is higher than V1. If the difference exceeds the threshold (output torque detection is unreliable), the rotation speed of the ring will automatically switch to be controlled based on the comparison between the estimated torque and the above three types of torque thresholds, and at the same time, a sensor abnormality warning will be triggered (without interrupting the grinding).

[0062] With this setting, the "load-speed" dynamic adaptation allows the rotating ring to slow down (V2) in overloaded areas (such as excess thickness and weld beads) to extend the grinding time, while the rotating ring to speed up (V3) in underloaded areas (such as the weld toe transition zone) to shorten the grinding time. This adapts to the grinding needs of different areas and avoids grinding problems. Furthermore, it can improve detection reliability: the dual-source torque signals are mutually redundant, avoiding control failures caused by a single sensor malfunction and ensuring continuous grinding.

[0063] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A grinding device for the circumferential weld seam of a wind turbine tower, characterized in that, The device includes a rotating frame (2), a rotating ring (1), and a grinding assembly. The rotating frame (2) is arranged in a ring shape, and the rotating ring (1) is fitted inside the rotating frame (2) and can rotate around the axis of the rotating frame (2). The rotating frame (2) is provided with a rotation drive mechanism for driving the rotating ring (1) to rotate. The rotating ring (1) has a through hole in the middle for the wind turbine tower (3) to pass through. The grinding assembly is located on the rotating ring (1), and multiple grinding assemblies are arranged and distributed along the circumference of the rotating ring (1). The grinding assembly includes a mounting frame (5), a grinding wheel (4), a drive wheel (17), and a grinding drive mechanism. The mounting frame (5) is located inside the rotating ring (1), the grinding wheel (4) is rotatably mounted on the mounting frame (5), the drive wheel (17) is connected to the grinding wheel (4), and the grinding drive mechanism is connected to the drive wheel (17).

2. The wind turbine tower circumferential weld grinding device according to claim 1, characterized in that, The grinding drive mechanism consists of a grinding motor, a grinding drive wheel (9), and a grinding belt (7) fixed on the rotating ring (1); wherein, the output end of the grinding motor is connected to the grinding drive wheel (9) for transmission, and the grinding belt (7) is sleeved on the grinding drive wheel (9) and the drive wheel (17) so that the grinding drive wheel (9) and the drive wheel (17) are linked together.

3. The wind turbine tower circumferential weld grinding device according to claim 2, characterized in that, The grinding drive mechanism also includes a grinding tension wheel (8) disposed on the rotating ring (1), the grinding tension wheel (8) being rotatably disposed on the rotating ring (1) via a rotating shaft; there is a grinding tension wheel (8) between two adjacent driving wheels (17); the grinding belt (7) is disposed on the side of the driving wheel (17) facing the center of the rotating ring (1), and the grinding belt (7) is tensioned on the side of the grinding tension wheel (8) away from the center of the rotating ring (1).

4. A grinding device for circumferential weld seams of wind turbine towers according to claim 3, characterized in that, It also includes an adjustment mechanism, which is located on the rotating ring (1) and is used to adjust the distance between the grinding wheel (4) and the center of the rotating ring (1).

5. A grinding device for circumferential weld seams of wind turbine towers according to claim 4, characterized in that, The adjustment mechanism includes a threaded cylinder (16) fixed to the outside of the rotating ring (1). The threaded cylinder (16) is arranged radially along the rotating ring (1). A screw (6) is threadedly connected to the inside of the threaded cylinder (16). The lower end of the screw (6) passes through the threaded cylinder (16) and the rotating ring (1) and is rotatably connected to the upper end of the mounting bracket (5).

6. A grinding device for circumferential weld seams of wind turbine towers according to claim 5, characterized in that, The lower end of the screw (6) is rotatably connected to the upper end of the mounting bracket (5) via a bearing; a locking nut is threaded onto the upper end of the screw (6).

7. A grinding device for circumferential weld seams of wind turbine towers according to claim 6, characterized in that, The rotating frame (2) includes a fixed base and a rotating bearing disposed on the fixed base, and the rotating ring (1) is sleeved on the inner ring of the rotating bearing; The rotary drive mechanism includes a rotary drive ring (15), a rotary drive motor, and a rotary drive wheel (11); wherein, The two ends of the rotating ring (1) extend out of the two end faces of the rotary bearing, and the grinding wheel (4) and the rotary drive ring (15) are located at the left and right ends of the rotating ring (1), respectively. The rotating drive ring (15) is fixedly connected to the left end of the rotating ring (1), the rotating drive motor is connected to the rotating drive wheel (11) for transmission, and the rotating drive wheel (11) is connected to the rotating drive ring (15) through a rotating belt (12).

8. A grinding device for circumferential weld seams of wind turbine towers according to claim 7, characterized in that, Also includes: Two rotating tension wheels (10) are provided and located above the rotating drive wheel (11); The support bracket includes a lifting mechanism (13) and an arc-shaped support plate (14) located at the upper end of the lifting mechanism (13). The inner contour of the arc-shaped support plate (14) matches the outer contour of the wind turbine tower (3).

9. A grinding device for circumferential weld seams of wind turbine towers according to claim 2, characterized in that, It also includes a torque sensor for detecting the output torque of the grinding motor.

10. A grinding device for circumferential weld seams of wind turbine towers according to claim 9, characterized in that, It also includes a torque detection module, which is used to detect the current signal of the grinding motor and obtain the estimated torque of the grinding motor based on the current signal.

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