A bending device for fan production

Abstract

The application discloses a bending device for fan production, which comprises a workbench, a supporting frame is installed on the workbench, a bending seat is detachably installed on the supporting frame, a clamping assembly for clamping and fixing the bending seat is installed on the supporting frame, a fixing plate is slidably installed in the supporting frame in the vertical direction, a bending head matched with the bending seat is installed at the bottom of the fixing plate, and the bending head is detachably installed at the bottom of the fixing plate through a clamping assembly. The clamping assembly capable of quickly detaching the bending seat and the clamping assembly capable of quickly detaching the bending head are arranged, so that a plurality of bolts do not need to be detached one by one with the aid of tools, and the replacement process of the bending component is obviously simplified; the controller is used for collecting the current signal of the motor driving the bidirectional screw rod in real time, extracting characteristic parameters such as the no-load current, the starting current peak value, the clamping steady-state current and the fluctuation, calculating the comprehensive health degree index and grading alarm, and realizing the online monitoring of the wear and friction state of the bidirectional screw rod.

Description

Technical Field

[0001] This invention relates to the field of wind turbine manufacturing technology, and more specifically, to a bending device for wind turbine manufacturing. Background Technology

[0002] In the manufacturing process of wind turbines, the bending of sheet metal parts is one of the key processes, involving the forming of various components such as the wind turbine casing, flanges, and blade supports. These components often require different bending angles to adapt to different aerodynamic performance and assembly requirements.

[0003] Traditional wind turbine production bending equipment often adjusts the bending angle by replacing bending components. However, replacing bending components usually requires manual operation of tools to disassemble and install multiple fastening bolts one by one. This process is cumbersome and time-consuming, reducing the production efficiency of the bending equipment.

[0004] Therefore, a new solution is needed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bending device for wind turbine production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bending device for wind turbine production includes a workbench with a support frame mounted on it. A bending seat is detachably mounted on the support frame, and a clamping assembly for clamping and fixing the bending seat is mounted on the support frame. A fixing plate is slidably mounted on the support frame in the vertical direction, and a bending head adapted to the bending seat is mounted on the bottom of the fixing plate. The bending head is detached and reattached to the bottom of the fixing plate via a snap-fit ​​assembly.

[0008] Furthermore, the clamping assembly includes a mounting groove formed in the support frame, a bidirectional screw rotatably connected in the mounting groove, a motor for driving the bidirectional screw to rotate is installed on the outer wall of the support frame, sliders are threadedly connected to the two sets of reverse threaded sections of the bidirectional screw, the upper part of each set of sliders extends out of the mounting groove and is fixedly mounted with a clamping plate, and the two sets of clamping plates are respectively clamped on both sides of the bending seat.

[0009] Furthermore, the snap-fit ​​assembly includes a snap-fit ​​block installed on the bottom of the fixing plate, and the top of the bending head is provided with a snap-fit ​​groove that matches the snap-fit ​​block. Both the snap-fit ​​block and the snap-fit ​​groove are provided with positioning holes for the same positioning pin to be inserted.

[0010] Furthermore, an annular groove is formed inside the bending head at the wall of the positioning hole, and a groove is formed on the positioning pin. A positioning head is provided in the groove, and the positioning head is movably connected to the groove by a spring.

[0011] Furthermore, a hydraulic cylinder is installed on the support frame, and the output end of the hydraulic cylinder passes through the upper surface of the support frame and is connected to the fixing plate.

[0012] Furthermore, it also includes a controller, which is electrically connected to the motor and is used to collect the motor's drive current in real time.

[0013] Furthermore, the controller is configured to perform bidirectional real-time screw health status detection, including the following steps:

[0014] Step S1: After the bending device is used for the first time or the bidirectional screw is replaced, perform no-load current calibration and clamping current calibration to obtain the initial no-load current average value, initial no-load current fluctuation root mean square value, initial starting current peak value, initial clamping steady-state current average value and initial clamping steady-state current fluctuation root mean square value.

[0015] Step S2: During each clamping action, the motor current waveform is collected in real time, and the real-time average no-load current, the real-time root mean square of no-load current fluctuation, the real-time peak starting current, the real-time average clamping steady-state current, and the real-time root mean square of clamping steady-state current fluctuation are calculated.

[0016] Furthermore, the controller is also configured to: calculate wear indicators and friction indicators, and calculate a weighted comprehensive health index; and perform graded alarms based on the comprehensive health index.

[0017] The beneficial effects of this invention are:

[0018] This invention simplifies the replacement process of bending components by setting up a clamping component for quick assembly and disassembly of the bending seat and a snap-fit ​​component for quick assembly and disassembly of the bending head, eliminating the need to disassemble multiple bolts one by one with tools. This makes the adjustment of the bending angle more time-saving and labor-saving. At the same time, the controller collects the current signal of the motor driving the bidirectional screw in real time, extracts characteristic parameters such as no-load current, peak starting current, clamping steady-state current and its fluctuation, calculates the comprehensive health index and performs graded alarms, realizing online monitoring of the wear and friction status of the bidirectional screw. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a bending device for wind turbine production in this embodiment;

[0020] Figure 2 This is a schematic diagram of one structure of the clamping component in this embodiment;

[0021] Figure 3 This is a schematic diagram of a connection structure between the fixed plate and the bending head in this embodiment;

[0022] Figure 4 This is a schematic diagram of one structure of the fixing plate in this embodiment;

[0023] Figure 5 This is a schematic diagram of one structure of the bending head in this embodiment;

[0024] Figure 6 This is a cross-sectional view of the bending head in this embodiment;

[0025] Figure 7 This is a schematic diagram of one structure of the locating pin in this embodiment.

[0026] Reference numerals in the attached drawings: 1. Workbench; 2. Support frame; 3. Bending seat; 4. Clamping assembly; 41. Mounting slot; 42. Bidirectional screw; 43. Motor; 44. Slider; 45. Clamping plate; 5. Fixing plate; 6. Bending head; 7. Snap-fit ​​assembly; 71. Snap-fit ​​block; 72. Snap-fit ​​groove; 73. Positioning hole; 74. Positioning pin; 75. Annular groove; 76. Positioning head; 77. Groove; 78. Spring; 8. Hydraulic cylinder. Detailed Implementation

[0027] 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.

[0028] Example: A bending device for wind turbine manufacturing, such as... Figures 1-7 As shown, the device includes a worktable 1, a support frame 2, a bending seat 3, a clamping assembly 4, a fixing plate 5, a bending head 6, and a snap-fit ​​assembly 7. The worktable 1 is the main support frame of the entire bending device, constructed of cast iron or welded steel, providing sufficient rigidity and stability. The support frame 2, mounted on the worktable 1, has a portal frame structure and supports the bending seat 3 and hydraulic cylinder 8. The bending seat 3 is detachably mounted on the support frame 2 and serves as the support component for bending the fan workpiece. Its upper surface has a V-groove or a specific contour designed according to the workpiece shape; the contour angle determines the bending angle of the workpiece. By replacing bending seats 3 with different contour specifications, different bending angles can be adjusted. The clamping assembly 4, assembled on the support frame 2, enables quick clamping and fixing of the bending seat 3, replacing the traditional multi-bolt fastening method and avoiding the tedious process of operating each bolt individually during disassembly and assembly.

[0029] Furthermore, such as Figure 2As shown, the clamping assembly 4 includes a mounting slot 41 formed in the support frame 2, which provides mounting space for the bidirectional screw 42 and the slider 44. The bidirectional screw 42 is rotatably connected within the mounting slot 41, and its bidirectional thread is used to achieve synchronous and opposite movements of the two sets of sliders 44. A motor 43 is mounted on the outer wall of the support frame 2, and the motor 43 can output stable rotational power to drive the bidirectional screw 42 to rotate.

[0030] The two sets of reverse threaded sections of the bidirectional screw 42 are respectively threaded with sliders 44. The sliders 44 can convert the rotational motion of the bidirectional screw 42 into their own horizontal linear motion. Due to the bidirectional thread design of the bidirectional screw 42, the two sets of sliders 44 will move towards or away from each other synchronously. The upper part of each set of sliders 44 extends out of the mounting groove 41 and is fixedly mounted with a clamping plate 45. The clamping surface of the clamping plate 45 is in contact with the two side walls of the bending seat 3, and the clamping force ensures the stability of the bending seat 3 during the bending process.

[0031] When it is necessary to install and fix the bending seat 3, the motor 43 drives the bidirectional screw 42 to rotate in the forward direction, and the two sets of sliders 44 drive the clamping plates 45 to move closer to each other, applying clamping force from both sides of the bending seat 3, and quickly fixing the bending seat 3 to the support frame 2; when it is necessary to remove the bending seat 3, the motor 43 drives the bidirectional screw 42 to rotate in the reverse direction, and the two sets of clamping plates 45 move away from each other, releasing the clamping of the bending seat 3. At this time, the bending seat 3 can be directly removed. The entire clamping or unlocking process does not require the use of tools, improving the operating efficiency of the device.

[0032] Furthermore, such as Figure 1 , Figures 3-7 As shown, the fixing plate 5 is slidably installed in the support frame 2 along the vertical direction, serving as the mounting carrier for the bending head 6. The bending head 6 is located at the bottom of the fixing plate 5 and is adapted to the bending seat 3. It is the component that directly applies bending force to the fan workpiece. By replacing the bending head 6 that matches the bending seat 3, bending requirements of different angles can be met.

[0033] The snap-fit ​​assembly 7 connects the fixing plate 5 and the bending head 6, enabling quick assembly and disassembly of the bending head 6 without the need for tools to loosen or remove bolts. Specifically, the snap-fit ​​assembly 7 includes a snap-fit ​​block 71 installed at the bottom of the fixing plate 5. The shape of the snap-fit ​​block 71 is adapted to the snap-fit ​​groove 72, and the initial positioning and connection of the bending head 6 and the fixing plate 5 are achieved by snapping into the snap-fit ​​groove 72. The snap-fit ​​groove 72 is formed at the top of the bending head 6 and is a recessed structure that cooperates with the snap-fit ​​block 71, which can accommodate the snap-fit ​​block 71 and limit its horizontal displacement.

[0034] When installing the bending head 6, simply align the slot 72 at the top of the bending head 6 with the block 71 at the bottom of the fixing plate 5 and press down so that the block 71 is fully embedded in the slot 72 to complete the initial positioning and installation of the bending head 6.

[0035] Furthermore, both the locking block 71 and the locking slot 72 have a through-hole 73 for inserting the same locating pin 74. The locating hole 73 provides an installation channel for the locating pin 74, and its diameter matches the outer diameter of the locating pin 74, ensuring the tightness of the locating pin 74 after insertion and preventing loosening. The locating pin 74 is inserted into the through-hole locating hole 73, restricting the relative displacement of the locking block 71 and the locking slot 72 in the vertical direction, ensuring the safety and stability of the bending operation.

[0036] After the locking block 71 is inserted into the locking slot 72 to complete the initial positioning of the bending head 6, the positioning pin 74 is inserted into the through positioning hole 73. The positioning pin 74 locks the relative position of the locking block 71 and the locking slot 72, preventing them from separating. When it is necessary to disassemble the bending head 6, simply pull out the positioning pin 74 to release the vertical restriction between the locking block 71 and the locking slot 72, and then lift the bending head 6 upward to complete the disassembly.

[0037] To further improve positioning reliability, several annular grooves 75 are formed inside the bending head 6 at the wall of the positioning hole 73. A positioning head 76, which is engaged with the annular groove 75, is movably mounted on the positioning pin 74. Specifically, a groove 77 is formed on the positioning pin 74, and the positioning head 76 is movably connected to the groove 77 via a spring 78. The two ends of the spring 78 are respectively connected to the positioning head 76 and the bottom wall of the groove 77. The groove 77 provides installation space for the positioning head 76 and the spring 78, while limiting the range of motion of the positioning head 76. The spring 78 can provide a continuous outward elastic thrust to the positioning head 76, ensuring that the positioning head 76 is stably engaged in the annular groove 75.

[0038] When the positioning pin 74 is inserted into the positioning hole 73, the positioning head 76 pops outward under the elastic force of the spring 78 and gets into the annular groove 75 of the bending head 6, thus achieving secondary fixation of the positioning pin 74 and preventing it from falling off due to vibration. Preferably, the outer end of the positioning head 76 has an arc-shaped structure, which fits precisely with the inner wall of the annular groove 75. When disassembly is required, pulling the positioning pin 74 will cause the positioning head 76 to retract into the groove 77. At this time, the positioning head 76 and the annular groove 75 are disengaged, and the positioning pin 74 can be easily pulled out.

[0039] Furthermore, such as Figure 1 As shown, a hydraulic cylinder 8 is installed on the support frame 2. The output end of the hydraulic cylinder 8 passes through the support frame 2 and connects to the top of the fixed plate 5. When bending is required, the output end of the hydraulic cylinder 8 extends downward, pushing the fixed plate 5 to move downward in the vertical direction, thereby driving the bending head 6 at the bottom to move downward synchronously, applying pressure to the fan workpiece placed on the bending seat 3, and bending the workpiece in accordance with the contour of the bending seat 3. After bending is completed, the output end of the hydraulic cylinder 8 retracts upward, driving the fixed plate 5 and the bending head 6 to return to their original positions, so that the processed workpiece can be removed or the bending component can be replaced.

[0040] The hydraulic cylinder 8 can be selected with a rated thrust of 5-10 tons and a working pressure of 10-16MPa, and is installed using a flange mounting method. The rated thrust of 5-10 tons ensures that the workpiece is fully bent and formed without excessive deformation, and the working pressure of 10-16MPa is within the conventional pressure range of hydraulic systems, making it easy to match with general hydraulic stations and reducing equipment matching costs; the flange mounting can improve the connection stability between the hydraulic cylinder 8 and the support frame 2, and together with the vertical sliding guide of the fixed plate 5, ensure the coaxiality and bending accuracy of the bending head 6 when pressure is applied.

[0041] Furthermore, the bending device also includes a controller, which is electrically connected to the motor 43 and has a built-in current sampling circuit for real-time acquisition of the drive current of the motor 43. The controller can be a PLC, a microcontroller, or an embedded industrial controller.

[0042] Since the bidirectional screw 42 is subjected to alternating loads during operation, in order to achieve real-time monitoring of the health status of the bidirectional screw 42, the controller executes the detection algorithm according to the following steps:

[0043] Step S1: After the bending device is used for the first time or after the bidirectional screw 42 is replaced, perform the no-load current calibration and the clamping position current calibration.

[0044] No-load current calibration: The controller drives the motor 43 to make the bidirectional screw 42 unloaded (the clamping plate 45 does not contact the bending seat 3), and rotates at a constant speed for a set time. (e.g., 5 seconds), the current sampling circuit uses a sampling frequency... (e.g., 1kHz) Continuously record the current value of motor 43 to obtain the sampling sequence. , Then, the average initial no-load current is obtained through calculation. and the root mean square of the initial no-load current fluctuation .

[0045] Initial no-load current mean The formula for calculating the basic resistance of the transmission system under no-load conditions is as follows:

[0046]

[0047] Root mean square of initial no-load current fluctuation The formula used to reflect the inherent fluctuation of friction under no-load conditions is as follows:

[0048]

[0049] In the formula, This is the k-th current sample value; This represents the number of sampling points during the no-load current calibration phase.

[0050] Clamping current calibration: The controller drives the motor 43 to clamp the clamping plate 45 from the loosened position until the bending seat 3 is fully clamped and reaches the set clamping force. During this process, the current sampling circuit continuously records the current value. Sampling at the same sampling frequency The peak current when the clamping plate 45 just contacts the bending seat 3 is recorded as the initial starting current peak value. The average current over one second after clamping stabilizes is used as the initial clamping steady-state current average. The root mean square of the current fluctuation in this steady-state segment is calculated as the root mean square of the initial clamping steady-state current fluctuation. .

[0051] Initial startup current peak The maximum instantaneous current value occurring during the entire clamping process reflects the static friction and inertia at startup. Its calculation formula is:

[0052]

[0053] In the formula, The total time required for the clamping action to complete.

[0054] Once the clamping force stabilizes (the current fluctuation amplitude is less than the set threshold), the sampling time during the stabilization phase is recorded. Current sampling sequence within 1 second (e.g.) , , This refers to the number of sampling points during the clamping current calibration stage.

[0055] Initial clamping steady-state current mean The torque required to maintain the set clamping force is calculated using the following formula:

[0056]

[0057] Initial clamping steady-state current ripple root mean square The formula used to reflect the smoothness of thread friction under healthy conditions is as follows:

[0058]

[0059] In the formula, This represents the j-th current sample value during the steady-state phase.

[0060] The above five features are stored in the controller as reference feature vectors.

[0061] Step S2: During each normal production run, when the bending seat 3 performs a clamping action, the controller synchronously collects the current waveform of the motor 43, starting from the start of clamping by the motor 43, at a sampling frequency... Record the current value until the clamping action is completed and held stably for more than 2 seconds. Based on the acquired current waveform, calculate the following real-time characteristic quantities:

[0062] Real-time average no-load current : Calculated during the unloaded section before the clamping action begins (when clamping plate 45 is not in contact with bending seat 3), sampling sequence , The number of sampling points for the unloaded section is calculated using the following formula:

[0063]

[0064] In the formula, This is the k-th current sample value in the unloaded section.

[0065] Real-time no-load current fluctuation root mean square The calculation formula is as follows:

[0066]

[0067] Real-time startup current peak The calculation formula is as follows:

[0068]

[0069] In the formula, This represents the actual duration of the clamping action.

[0070] Real-time clamping steady-state current average Duration after clamping stabilizes Average current within, sampling sequence The calculation formula is as follows:

[0071]

[0072] In the formula, This is the j-th current sample value during the steady-state period.

[0073] Real-time clamping steady-state current fluctuation root mean square The calculation formula is as follows:

[0074]

[0075] The above five real-time characteristic quantities reflect the current wear and friction state of the screw.

[0076] Step S3, the controller calculates the wear index. and friction index .

[0077] Wear indicators The formula used to comprehensively reflect the changes in current and steady-state fluctuations required to maintain clamping force is as follows:

[0078]

[0079] Among them, the average value of the initial clamping steady-state current Average value of real-time clamping steady-state current The larger the ratio, the more significant the increase in current required to maintain the clamping force (increased wear); the root mean square of the initial clamping steady-state current fluctuation. With real-time clamping steady-state current fluctuation root mean square The larger the ratio, the greater the steady-state current fluctuation (friction instability).

[0080] Friction index The formula used to reflect changes in starting resistance and no-load resistance is as follows:

[0081]

[0082] Among them, the initial start-up current peak value With real-time startup current peak The larger the ratio, the more significant the increase in starting resistance; the average initial no-load current. With real-time average no-load current The larger the ratio, the more significant the increase in no-load resistance.

[0083] Then, a weighted comprehensive health index is calculated. :

[0084]

[0085] In the formula, and For the preset weighting coefficients, such as =0.6, =0.4; Overall Health Index The value range is 0 to 1, where 1 represents a completely new state.

[0086] According to the comprehensive health index Implement tiered alarms:

[0087] When the comprehensive health index When the value is ≥0.8, the bidirectional screw 42 is in good condition, there is no alarm, and the device is operating normally;

[0088] When 0.6 ≤ Comprehensive Health Index When the value is less than 0.8, the controller will display "Slight wear on the bidirectional screw, inspection recommended soon", which does not affect normal use;

[0089] When 0.4 ≤ Comprehensive Health Index When the force is less than 0.6, the controller issues a warning that "the bidirectional screw is moderately worn, please prepare spare parts" and automatically reduces the maximum allowable clamping force by 10% to extend the remaining life of the bidirectional screw 42, while recording the alarm information.

[0090] When the comprehensive health index When the value is less than 0.4, the controller issues a critical alarm stating "The bidirectional screw has reached its lifespan limit and must be replaced immediately," and prohibits subsequent clamping and bending actions until the screw is manually replaced and recalibrated.

[0091] Through the above-mentioned graded alarms, operators can promptly understand the health status of the bidirectional screw 42 and arrange maintenance or replacement of the screw according to the alarm prompts, thus avoiding sudden failure accidents.

[0092] Preferably, the controller can also record the overall health index after each clamping action. Create a historical sequence. Take the health data from the most recent m clamping incidents (e.g., m=10) and calculate the average health decrease per clamping incident:

[0093]

[0094] In the formula, The health index after the kth clamping; The number of historical data points selected; For the first Health index after clamping.

[0095] Predict the remaining number of clamping cycles. :

[0096]

[0097] in, =0.4 is the failure threshold; when the remaining available clamping times When the lifespan is ≤20 cycles, the controller issues an emergency maintenance reminder: "The bidirectional screw has less than 20 cycles remaining; please replace it as soon as possible." This predictive function helps to enable preventative maintenance and avoid sudden downtime.

[0098] Preferably, the controller also detects the instantaneous current value in real time. ,when If the controller determines that the bidirectional screw 42 is stuck or a foreign object is stuck, it will immediately stop the motor 43 from driving and rotate it in the opposite direction a short distance to release the stress. At the same time, it will issue an audible and visual alarm and display "Bidirectional screw stuck, please check" on the controller. It will prohibit the bending operation from continuing until it is manually reset.

[0099] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A bending device for fan manufacturing, comprising a workbench (1), characterized in that, A support frame (2) is installed on the workbench (1). A bending seat (3) is detachably installed on the support frame (2). A clamping assembly (4) for clamping and fixing the bending seat (3) is installed on the support frame (2). A fixing plate (5) is slidably installed on the support frame (2) in the vertical direction. A bending head (6) adapted to the bending seat (3) is installed at the bottom of the fixing plate (5). The bending head (6) is attached to the bottom of the fixing plate (5) by a snap-fit ​​assembly (7).

2. The bending device for fan manufacturing according to claim 1, characterized in that, The clamping assembly (4) includes a mounting groove (41) formed in the support frame (2). A bidirectional screw (42) is rotatably connected in the mounting groove (41). A motor (43) for driving the bidirectional screw (42) to rotate is installed on the outer side wall of the support frame (2). Slider (44) is threadedly connected to two sets of reverse threaded sections of the bidirectional screw (42). The upper part of each set of sliders (44) extends to the outside of the mounting groove (41) and is fixedly installed with a clamping plate (45). The two sets of clamping plates (45) are respectively clamped on both sides of the bending seat (3).

3. The bending device for fan manufacturing according to claim 1, characterized in that, The snap-fit ​​assembly (7) includes a snap-fit ​​block (71) installed at the bottom of the fixing plate (5). The top of the bending head (6) is provided with a snap-fit ​​groove (72) that is compatible with the snap-fit ​​block (71). Both the snap-fit ​​block (71) and the snap-fit ​​groove (72) are provided with positioning holes (73) for the same positioning pin (74) to be inserted.

4. A bending device for fan manufacturing according to claim 3, characterized in that, The bending head (6) has an annular groove (75) on the wall of the positioning hole (73) inside, and a groove (77) is provided on the positioning pin (74). A positioning head (76) is provided in the groove (77), and the positioning head (76) is movably connected to the groove (77) by a spring (78).

5. A bending device for fan manufacturing according to claim 1, characterized in that, A hydraulic cylinder (8) is installed on the support frame (2), and the output end of the hydraulic cylinder (8) passes through the support frame (2) and is connected to the upper surface of the fixing plate (5).

6. A bending device for fan manufacturing according to claim 1, characterized in that, It also includes a controller, which is electrically connected to the motor (43) and is used to collect the drive current of the motor (43) in real time.

7. A bending device for fan manufacturing according to claim 6, characterized in that, The controller is configured to perform real-time health status detection of the bidirectional screw (42), including the following steps: Step S1: After the bending device is used for the first time or the bidirectional screw (42) is replaced, the no-load current calibration and clamping current calibration are performed to obtain the initial no-load current average value, the initial no-load current fluctuation root mean square value, the initial starting current peak value, the initial clamping steady-state current average value and the initial clamping steady-state current fluctuation root mean square value. Step S2: During each clamping action, the current waveform of the motor (43) is collected in real time, and the real-time no-load current average value, real-time no-load current fluctuation root mean square value, real-time starting current peak value, real-time clamping steady-state current average value and real-time clamping steady-state current fluctuation root mean square value are calculated.

8. A bending device for fan manufacturing according to claim 7, characterized in that, The controller is also configured to: calculate wear and friction indicators, and calculate a weighted comprehensive health index; and issue graded alarms based on the comprehensive health index.

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