Method for manufacturing a fan blade of an axial fan

Abstract

The application discloses a fan blade manufacturing method of an axial flow fan, which comprises the following steps: processing a hub, a blade and a shaft hole; installing a hub positioning seat on a positioning frame and positioning the hub; installing a blade clamp on an auxiliary frame and positioning the blade; adjusting the blade clamp and the height of the hub positioning, locking the blade and the corresponding height side wall of the hub after the blade and the corresponding height side wall of the hub are in close contact, and welding and fixing. The hub positioning seat and the blade clamp are independently arranged, are guided to move in cooperation with the auxiliary frame, can simultaneously position and adjust multiple blades outside the hub, can synchronously adjust the height of the hub, can realize the accurate close contact of the blade and the hub, can significantly improve the welding positioning precision and consistency, can avoid the installation angle deviation and dynamic balance problems caused by manual adjustment, are convenient to assemble and disassemble, are high in universality, and improve the production efficiency, the welding quality of the fan blade and the operation stability.

Description

Technical Field

[0001] This invention belongs to the field of fan blade manufacturing technology, specifically relating to a method for manufacturing fan blades for an axial flow fan. Background Technology

[0002] Axial flow fans are widely used in ventilation, air conditioning, and industrial cooling due to their large air volume and relatively low noise. As the core rotating component of an axial flow fan, the manufacturing precision of the fan blades directly affects the fan's aerodynamic performance, operational stability, and service life. Fan blades typically consist of a hub and blades; the blades and hub can be integrally molded or fixed by welding.

[0003] Currently, in the welding and manufacturing process of axial flow fan blades, the blades are typically placed in their predetermined welding positions on the hub sidewall using manual measurement or simple tooling before welding. The welding positioning accuracy between the blades and the hub relies heavily on the operator's experience and manual measurement, which can easily lead to inconsistent installation angles among the blades, severely affecting the fan's dynamic balance and airflow efficiency. Furthermore, during actual assembly, repeated adjustments to the blade positions are necessary, making the process cumbersome and inefficient. Summary of the Invention

[0004] The purpose of this invention is to provide a technical solution for manufacturing axial flow fan blades, addressing the shortcomings of existing technologies. By setting independent hub positioning seats and blade clamps, and using an auxiliary frame to guide the movement of the blade clamps, multiple blades on the outer side of the hub can be positioned and adjusted simultaneously. The hub positioning height is also adjusted synchronously, ensuring that each blade accurately contacts and fits against the sidewall of the hub at the corresponding height. This significantly improves the positioning accuracy and consistency of each blade and hub before welding, effectively avoiding the problems of installation angle deviation, uneven fit, and poor dynamic balance caused by individual adjustments in traditional manual or simple tooling methods. Furthermore, this method eliminates the need for repeated adjustments to each blade, greatly improving production efficiency. It can also adapt to the manufacturing of various fan blades by changing different specifications of positioning seats and clamps, demonstrating strong versatility and ultimately ensuring the welding quality, structural strength, and overall operational stability of the fan blades.

[0005] To solve the technical problem, the present invention adopts the following technical solution:

[0006] A method for manufacturing the blades of an axial flow fan, the blades comprising a hub and blades welded to the outer wall of the hub, characterized in that:

[0007] The manufacturing method includes the following steps:

[0008] Step 1: Machin the hub and blades according to the design dimensions, and machine the shaft hole in the middle of the hub;

[0009] Step 2: Select a wheel locating seat that corresponds to the wheel size, install the wheel locating seat onto the locating bracket, and then install the wheel rim onto the wheel locating seat;

[0010] Step 3: Select the blade fixture corresponding to the blade, install the blade fixture onto the auxiliary frame, and then install and position the blade onto the blade fixture;

[0011] Step 4: Adjust the blade clamp. Move the blade clamp along the auxiliary frame towards the hub. The blade clamp will drive the blade to move synchronously. Adjust the positioning height of the hub until the blade and the side wall of the hub at the corresponding height are in contact and fit together. Lock the blade clamp.

[0012] Step 5: Use a welding device to weld and fix the connection between the blade and the hub.

[0013] Furthermore, the positioning frame includes a fixed frame and an adjustable frame. The fixed frame has fixing holes, and the adjustable frame can be adjusted and mounted on the fixed frame. The fixing holes are located on the fixed base plate, which facilitates the installation and fixing of the positioning frame to the mounting surface. The adjustable frame and the fixed frame are designed to be adjustable, so that the height of the adjustable frame can be adjusted to accommodate different wheel hub installation heights in order to meet the welding position requirements.

[0014] Furthermore, in step two, the installation and positioning steps for the wheel hub are as follows:

[0015] (1) The hub positioning seat includes a base and a positioning stud. The positioning stud matches the shaft hole. The base is provided with a positioning groove. The adjustment bracket is provided with a positioning block. The positioning groove and the positioning block correspond one-to-one. The top surface of the positioning block is provided with an extension stud.

[0016] (2) The positioning slots and positioning blocks are matched one by one, and the positioning blocks are snapped into the corresponding positioning slots to realize the positioning snapping of the base on the adjustment frame. At the same time, the extension studs pass through the positioning slots.

[0017] (3) Screw the fastening nut into the top of the extension stud and tighten it to realize the installation and fixation of the wheel hub positioning seat on the adjustment frame; through the positioning groove and positioning block interlocking between the wheel hub positioning seat and the adjustment frame, and the locking structure of the extension stud and the fastening nut, the wheel hub positioning seat is quickly and accurately positioned and firmly installed on the adjustment frame. It is easy to install and disassemble, and can facilitate the quick replacement of wheel hub positioning seats of different sizes, adapting to multi-variety production.

[0018] (4) Place the hub onto the positioning stud, then screw the lock nut into the end of the positioning stud and tighten the lock nut to press the hub. Through the cooperation of the positioning stud and the lock nut, the hub can be coaxially and stably fixed on the positioning seat, effectively avoiding the hub's offset or shaking during the welding process, laying a reliable foundation for the precise fit between the blade and the hub. The installation and disassembly are simple and convenient, facilitating actual operation.

[0019] Furthermore, in step three, the blade installation and positioning steps are as follows:

[0020] (1) The blade clamp includes a sliding rod, a positioning sleeve and a clamping plate. The positioning sleeve is fixedly connected to the sliding rod. The positioning sleeve is provided with a slot, which matches the blade. The bottom end of the sliding rod is provided with a sliding seat, and the sliding seat is provided with a dovetail groove. The auxiliary frame is provided with a dovetail slide.

[0021] (2) The sliding seat is connected to the dovetail slide rail by the dovetail slide groove and the clamping screw is tightened to limit and fix the sliding seat; the cooperation of the dovetail slide groove and the dovetail slider improves the stable and accurate linear guidance, ensures that the blade does not deflect during the movement, and ensures the docking accuracy between the blade and the hub.

[0022] (3) Place the blade into the slot, and the outer side wall of the blade is matched and snapped into the slot; the contact side wall of the blade that is welded to the hub is the inner side wall, and the exposed side wall is the outer side wall. The slot on the positioning sleeve matches the shape of the blade. With the pressing action of the clamping plate, the blade can be firmly fixed and the blade surface can be avoided by the clamp directly and rigidly pinching it.

[0023] (4) Install the clamping plate. The clamping plate is equipped with a positioning handle with a through hole. The sliding rod is equipped with a limit stud. The limit stud matches the through hole. Align the through hole with the limit stud, position the positioning handle on the limit stud, and then move the clamping plate downwards so that the clamping plate gradually moves into the slot and presses against the top surface of the blade. Finally, screw the fixing nut into the end of the limit stud and lock it in place. The structure of the clamping plate, the limit stud, and the fixing nut makes the clamping and disassembly of the blade very simple, reducing the labor intensity of the workers.

[0024] Furthermore, in step four, the adjustment steps of the blade clamp are as follows: Loosen the clamping screw, and the sliding seat moves along the dovetail slide towards the hub. The sliding seat drives the positioning sleeve fixed to it to move synchronously, and the positioning sleeve drives the blade to move synchronously until the inner wall of the blade abuts against and adheres to the outer wall of the hub. By loosening the clamping screw, the sliding seat is released, allowing it to slide smoothly along the dovetail slide towards the hub, thereby driving the positioning sleeve and the blade as a whole to move synchronously until the inner wall of the blade abuts against and adheres to the outer wall of the hub. The adjustment process is stable and smooth, and can accurately control the degree of adhesion while maintaining the blade installation posture, significantly improving the consistency and adjustment efficiency of simultaneous positioning of multiple blades.

[0025] Furthermore, in step four, the wheel hub positioning height adjustment steps are as follows:

[0026] (1) The adjustment frame includes a support platform and an adjustment screw. The adjustment screw is distributed circumferentially on the bottom surface of the support platform. The fixed frame includes a fixed base plate and a lifting column. The lifting column is fixed on the fixed base plate. An outer expansion plate is fixedly connected to the outer wall of the top of the lifting column. The outer expansion plate is provided with perforated slots. The perforated slots correspond one-to-one with the adjustment screws. The adjustment screw passes through the corresponding perforated slots and is clamped and fixed on the outer expansion plate by two clamping nuts.

[0027] (2) Loosen the clamping nut and move the adjusting screw. The adjusting screw is always inserted into the through-hole groove. The adjusting screw drives the support platform to move synchronously. The support platform then drives the wheel hub positioning seat fixed to it to move synchronously, thereby realizing the adjustment of the wheel hub positioning height on the wheel hub positioning seat. When the wheel hub height is adjusted to the right position, tighten the clamping nut.

[0028] The hub positioning height is adjusted through the through-hole engagement of the adjusting screw and the upper and lower clamping nuts. This structure allows the support platform to raise and lower the entire hub positioning seat, enabling it to adapt to hub positioning requirements of different heights or welding positions. It is simple to operate, reliably locked, and, with the circumferentially distributed adjusting screws, maintains the levelness of the support platform, thus ensuring accurate and controllable spatial relationship between the hub axis and the blade position.

[0029] Furthermore, in the hub positioning height adjustment step, a guide post is provided on the bottom surface of the support platform, and a guide groove is provided at the center of the lifting post. The guide post matches the guide groove, and the guide post is vertically limited within the guide groove. When the adjustment screw is moved to adjust the hub height, the guide post remains confined within the guide groove and slides vertically along the guide groove. The cooperation between the guide post and the guide groove plays a role in preventing rotation and guiding, preventing the support platform from rotating circumferentially or getting stuck during height adjustment, ensuring the stability and verticality of the hub during the lifting and lowering adjustment process, and further improving the coaxiality accuracy of the fan blade manufacturing.

[0030] Furthermore, after the blades and hub are welded, the assembled workpiece is removed, the weld is inspected, and then the weld is ground to remove slag and protrusions, making the weld surface smooth and the transition smooth, thereby ensuring the appearance quality and welding strength of the blades and extending the service life of the axial flow fan.

[0031] Furthermore, the steps for removing the workpiece are as follows:

[0032] (1) Rotate the lock nut to remove it from the locating stud;

[0033] (2) Rotate the fixing nut to remove it from the limiting stud, move the positioning handle along the limiting stud, and the positioning handle will drive the clamping plate to move synchronously, releasing the clamping on the blade until the positioning handle is completely removed from the limiting stud and the clamping plate is removed.

[0034] (3) Then remove the workpiece after the blades and hub are welded.

[0035] By sequentially loosening the locking nut, removing the fixing nut, and moving the positioning handle and clamping plate along the limiting stud, the welded workpiece can be removed. The entire disassembly process is clear and does not interfere with each other. It avoids damage to the blade or hub caused by forcibly removing the parts and facilitates the quick re-clamping of the next set of workpieces. It has good operational repeatability and tooling reset efficiency.

[0036] The present invention, by employing the technical solution, has the following beneficial effects:

[0037] This invention, by setting independent hub positioning seats and blade clamps, and using an auxiliary frame to guide the movement of the blade clamps, allows for the simultaneous positioning and adjustment of multiple blades on the outer side of the hub. Simultaneously, the hub positioning height is adjusted, ensuring that each blade precisely contacts and adheres to the sidewall at the corresponding height of the hub. This significantly improves the positioning accuracy and consistency of each blade and hub before welding, effectively avoiding the problems of installation angle deviation, uneven adhesion, and poor dynamic balance caused by individual adjustments in traditional manual or simple tooling methods. Furthermore, this method eliminates the need for repeated adjustments to each blade, greatly improving production efficiency. By changing the positioning seats and clamps of different specifications, it can adapt to various wind turbine blade manufacturing processes, demonstrating strong versatility and ultimately ensuring the welding quality, structural strength, and overall operational stability of the wind turbine blades. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the assembly structure of the auxiliary frame, positioning frame, and hub positioning seat of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the present invention in the state where the wheel hub is initially placed on the wheel hub positioning seat;

[0041] Figure 3 This is a schematic diagram of the structure of the present invention when the hub is fixed on the hub positioning seat;

[0042] Figure 4 This is a schematic diagram of the structure of the present invention in the state where the blade is initially engaged in the slot;

[0043] Figure 5 This is a schematic diagram of the structure of the present invention when the blade is positioned and fixed on the blade clamp;

[0044] Figure 6 This is a schematic diagram of the structure of the present invention during the positioning and welding of the blade and hub;

[0045] Figure 7This is a schematic diagram of the structure of the present invention in the state where the wind turbine blades can be disassembled after welding;

[0046] Figure 8 This is a schematic diagram of the installation structure between the adjusting frame and the fixing frame in this invention;

[0047] Figure 9 This is a schematic diagram of the positional distribution structure between the auxiliary frame and the fixed frame in this invention;

[0048] Figure 10 This is a schematic diagram of the installation structure between the hub positioning seat and the adjustment frame in this invention;

[0049] Figure 11 This is a schematic diagram of the blade clamp in this invention;

[0050] Figure 12 This is a schematic diagram of the overall structure of the wind turbine blade in this invention.

[0051] In the diagram: 1-Wind blade; 2-Blade; 3-Hub; 4-Shaft hole; 5-Hub positioning seat; 6-Positioning frame; 7-Blade clamp; 8-Auxiliary frame; 9-Fixing frame; 10-Adjusting frame; 11-Base; 12-Positioning stud; 13-Positioning groove; 14-Positioning block; 15-Extension stud; 16-Fastening nut; 17-Locking nut; 18-Sliding rod; 19-Positioning sleeve; 20-Pressure clamping plate; 2 1-Slot; 22-Sliding seat; 23-Dovetail slide; 24-Dovetail slide; 25-Clamping screw; 26-Positioning handle; 27-Through hole; 28-Limiting stud; 29-Fixing nut; 30-Supporting platform; 31-Adjusting screw; 32-Fixing base plate; 33-Lifting column; 34-Outer expansion plate; 35-Through groove; 36-Clamping nut; 37-Guide column; 38-Guide groove; 39-Fixing hole. Detailed Implementation

[0052] like Figures 1 to 12 As shown, this invention provides a method for manufacturing the blades of an axial flow fan. The blade 1 includes a hub 3 and blades 2 welded to the outer wall of the hub 3. The manufacturing method specifically includes the following steps:

[0053] Step 1: Workpiece Machining

[0054] The hub 3 and blade 2 are machined according to the design dimensions, and the shaft hole 4 is machined at the center of the hub 3 so that it can be positioned in conjunction with the hub positioning seat 5 later.

[0055] Step 2: Installation and positioning of wheel hub 3

[0056] Select the wheel hub positioning seat 5 that corresponds to the current wheel hub 3 size, install the wheel hub positioning seat 5 onto the positioning bracket 6, and then install and position the wheel hub 3 onto the wheel hub positioning seat 5.

[0057] Specifically, the positioning frame 6 includes a fixed frame 9 and an adjusting frame 10. The fixed frame 9 is provided with fixing holes 39, which are located on the fixed base plate 32, facilitating the installation and fixing of the positioning frame 6 to the mounting surface. The adjusting frame 10 is adjustablely mounted on the fixed frame 9, making the height of the adjusting frame 10 adjustable, thus adapting to the flexible adjustment of the installation height of different wheel hubs 3 and meeting the requirements of different welding positions.

[0058] The installation and positioning steps for wheel hub 3 are as follows:

[0059] (1) The hub positioning seat 5 includes a base 11 and a positioning stud 12, which is matched with the shaft hole 4. The base 11 is provided with a positioning groove 13, and the adjustment bracket 10 is provided with a positioning block 14. The positioning groove 13 and the positioning block 14 correspond one-to-one, and the top surface of the positioning block 14 is provided with an extension stud 15.

[0060] (2) The positioning slot 13 and the positioning block 14 are connected one by one. The positioning block 14 is connected in the corresponding positioning slot 13 to realize the positioning of the base 11 on the adjustment frame 10. At the same time, the extension stud 15 passes through the positioning slot 13.

[0061] (3) Screw the fastening nut 16 into the top of the extension stud 15 and tighten it to achieve the installation and fixation of the hub positioning seat 5 on the adjustment frame 10. Through the engagement of the positioning groove 13 and the positioning block 14 between the hub positioning seat 5 and the adjustment frame 10, and the locking structure of the extension stud 15 and the fastening nut 16, the hub positioning seat 5 is quickly and accurately positioned and firmly installed on the adjustment frame 10. It is easy to install and disassemble, and it is convenient to quickly replace hub positioning seats 5 of different sizes, which can adapt to multi-variety production.

[0062] (4) Place the hub 3 onto the positioning stud 12, then screw the locking nut 17 into the end of the positioning stud 12 and tighten the locking nut 17 to press the hub 3. Through the cooperation of the positioning stud 12 and the locking nut 17, the hub 3 can be coaxially and stably fixed on the positioning seat, effectively avoiding the hub 3 from shifting or shaking during the welding process, laying a reliable foundation for the precise fit between the blade 2 and the hub 3, and is simple and convenient to install and disassemble, which is conducive to actual operation.

[0063] Step 3: Installation and positioning of blade 2

[0064] Select the blade clamp 7 corresponding to blade 2, install the blade clamp 7 onto the auxiliary frame 8, and then install and position the blade 2 onto the blade clamp 7. One blade 2 corresponds to one blade clamp 7, and one blade clamp 7 corresponds to one auxiliary frame 8. Multiple auxiliary frames 8 are evenly distributed circumferentially on the fixed base plate 32, with one blade clamp 7 installed on each auxiliary frame 8, thus achieving simultaneous and precise positioning of multiple blades 2 and the hub 3. The auxiliary frames 8 are fixed to the fixed base plate 32 with screws to ensure the stability and reliability of the installation.

[0065] The installation and positioning steps for blade 2 are as follows:

[0066] (1) The blade clamp 7 includes a sliding rod 18, a positioning sleeve 19, and a clamping plate 20. The positioning sleeve 19 is fixedly connected to the sliding rod 18, and a slot 21 is provided on the positioning sleeve 19, which matches the blade 2. A sliding seat 22 is provided at the bottom end of the sliding rod 18, and a clamping screw 25 is provided on the sliding seat 22. A dovetail groove 23 is provided on the sliding seat 22, and a dovetail slide 24 is provided on the auxiliary frame 8.

[0067] (2) The sliding seat 22 is slidably connected to the dovetail slide 24 via the dovetail groove 23, and then the clamping screw 25 is tightened to limit and fix the sliding seat 22 on the dovetail slide 24. The cooperation between the dovetail groove 23 and the dovetail slide 24 improves the stability and accuracy of the guide, ensures that the blade 2 does not deflect during the movement, and ensures the docking accuracy between the blade 2 and the hub 3. Preferably, both ends of the dovetail slide 24 are provided with limit end plates to prevent the sliding seat 22 from accidentally falling out and improve structural safety. In addition, a straight guide section is provided at the end of the dovetail slide 24 away from the hub positioning seat 5. When the sliding seat is completely slid from the dovetail slide 24 onto the straight guide section, the sliding seat 22 can be lifted up and removed for replacement and maintenance of the blade clamp 7.

[0068] (3) Place the blade 2 into the slot 21, and the outer side wall of the blade 2 is matched and snapped into the slot 21 (the contact side wall of the blade 2 that is welded to the hub 3 is the inner side wall, and the exposed side wall is the outer side wall). The slot 21 on the positioning sleeve 19 matches the shape of the blade 2. With the pressing action of the subsequent clamping plate 20, the blade 2 can be firmly fixed, and the blade 2 can be prevented from being directly and rigidly pinched by the fixture.

[0069] (4) Install the clamping plate 20. The clamping plate 20 is provided with a positioning handle 26, and the positioning handle 26 is provided with a through hole 27. The sliding rod 18 is provided with a limiting stud 28, and the limiting stud 28 matches the through hole 27. Align the through hole 27 with the limiting stud 28, position the positioning handle 26 on the limiting stud 28, and then move the clamping plate 20 downward so that the clamping plate 20 gradually moves into the slot 21 and presses against the top surface of the blade 2. Finally, screw the fixing nut 29 into the end of the limiting stud 28 and lock it. The structure of the clamping plate 20, the limiting stud 28 and the fixing nut 29 makes the clamping and disassembly of the blade 2 very simple, effectively reducing the labor intensity of the workers.

[0070] Step 4: Adjusting the fit between blade 2 and hub 3

[0071] Adjust the blade clamp 7 and the positioning height of the hub 3 until the blade 2 and the side wall of the hub 3 at the corresponding height are in contact and fit together, and then lock the blade clamp 7.

[0072] The specific adjustment process is divided into two parts: adjusting the blade clamp 7 and adjusting the positioning height of the hub 3.

[0073] (a) The adjustment steps for blade clamp 7 are as follows:

[0074] Loosen the clamping screw 25, and the sliding seat 22 moves along the dovetail slide 24 towards the hub 3. The sliding seat 22 drives the positioning sleeve 19 fixed to it to move synchronously, and the positioning sleeve 19 drives the blade 2 to move synchronously until the inner sidewall of the blade 2 abuts against and adheres to the outer sidewall of the hub 3. By loosening the clamping screw 25, the sliding seat 22 is released, allowing it to slide smoothly along the dovetail slide 24 towards the hub 3, thereby driving the positioning sleeve 19 and the blade 2 to move synchronously until the inner sidewall of the blade 2 abuts against and adheres to the outer sidewall of the hub 3. This adjustment process is stable and smooth, and can accurately control the degree of adhesion while maintaining the installation posture of the blade 2, significantly improving the consistency and adjustment efficiency of simultaneous positioning of multiple blades 2.

[0075] (II) The steps for adjusting the positioning height of wheel hub 3 are as follows:

[0076] (1) The adjusting frame 10 includes a support platform 30 and adjusting screws 31, which are circumferentially distributed on the bottom surface of the support platform 30. The fixed frame 9 includes a fixed base plate 32 and a lifting column 33, which is fixed on the fixed base plate 32. An outer expansion plate 34 is fixedly connected to the outer side wall of the top of the lifting column 33. The outer expansion plate 34 is provided with perforated slots 35, which correspond one-to-one with the adjusting screws 31. The adjusting screws 31 pass through the corresponding perforated slots 35 and are clamped and fixed to the outer expansion plate 34 by two clamping nuts 36.

[0077] (2) Loosen the clamping nut 36 and move the adjusting screw 31. The adjusting screw 31 is always inserted into the through-hole groove 35. The adjusting screw 31 drives the support platform 30 to move synchronously. The support platform 30 then drives the wheel hub positioning seat 5 fixed thereto to move synchronously, thereby realizing the adjustment of the positioning height of the wheel hub 3 on the wheel hub positioning seat 5. When the height of the wheel hub 3 is adjusted to the correct position, tighten the clamping nut 36.

[0078] The adjustment of the hub 3's positioning height is achieved through the through-fitting of the adjusting screw 31 with the perforated slot 35 and the clamping positioning of the upper and lower clamping nuts 36. This structure allows the support platform 30 to drive the hub positioning seat 5 to adjust its overall height, enabling the hub positioning seat 5 to adapt to different heights or welding positions of the hub 3. The operation is simple and the locking is reliable. Combined with the circumferentially distributed adjusting screws 31, the levelness of the support platform 30 can be maintained, thereby ensuring accurate and controllable spatial relationship between the hub 3's axis and the blade 2's position.

[0079] Furthermore, in the height adjustment step of the hub 3, a guide post 37 is provided on the bottom surface of the support platform 30, and a guide groove 38 is provided at the center of the lifting post 33. The guide post 37 matches the guide groove 38, and the guide post 37 is vertically limited within the guide groove 38. When the adjusting screw 31 is moved to adjust the height of the hub 3, the guide post 37 is always limited within the guide groove 38 and slides vertically along the guide groove 38. The cooperation between the guide post 37 and the guide groove 38 plays a role in preventing rotation and guiding, preventing the support platform 30 from rotating circumferentially or getting stuck when adjusting the height, ensuring the stability and verticality of the hub 3 during the lifting and lowering adjustment process, and further improving the coaxiality accuracy of the fan blade 1.

[0080] Step 5: Welding and fixing

[0081] After the blade 2 and the hub 3 are in position and all clamps are locked, a welding device is used to weld and fix the connection between the blade 2 and the hub 3.

[0082] Step Six: Workpiece Removal and Post-processing

[0083] After the blade 2 and hub 3 are welded together, the assembled workpiece is removed, the weld is inspected, and then the weld is ground. Grinding removes weld slag and protrusions, making the weld surface smooth and the transition even, thus ensuring the appearance quality and welding strength of the blade 1 and extending the service life of the axial flow fan. In actual manufacturing, the surface of the blade 2 can also be treated with friction reduction to reduce wind resistance and improve fan efficiency.

[0084] The steps for removing the workpiece are as follows:

[0085] (1) Rotate the locking nut 17 to remove it from the positioning stud 12;

[0086] (2) Rotate the fixing nut 29 to remove it from the limiting stud 28. Move the positioning handle 26 along the limiting stud 28. The positioning handle 26 drives the clamping plate 20 to move synchronously, releasing the clamping on the blade 2. Until the positioning handle 26 is completely removed from the limiting stud 28, remove the clamping plate 20.

[0087] (3) Then remove the workpiece after the blade 2 and hub 3 are welded.

[0088] By sequentially loosening the locking nut 17, removing the fixing nut 29, and moving the positioning handle 26 and clamping plate 20 along the limiting stud 28, the welded workpiece can be taken out. The entire disassembly process is clear and does not interfere with each other. It avoids damage to the blade 2 or hub 3 caused by forcibly removing the parts, and facilitates the quick re-clamping of the next set of workpieces. It has good operational repeatability and tooling reset efficiency.

[0089] In summary, the manufacturing method of the blade 1 of the axial flow fan provided by the present invention achieves precise contact and fit between the blade 2 and the hub 3 before welding by independently setting and coordinating the hub positioning seat 5 and the blade clamp 7. This significantly improves the welding positioning accuracy, the consistency of multiple blades 2, and the adjustment efficiency. At the same time, it is easy to assemble and disassemble and has strong versatility, which is conducive to improving the welding quality, structural strength and overall operational stability of the blade 1.

[0090] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to achieve substantially the same technical effect are all covered within the protection scope of the present invention.

Claims

1. A method for manufacturing the blades of an axial flow fan, the blades comprising a hub and blades welded to the outer wall of the hub, characterized in that: The manufacturing method includes the following steps: Step 1: Machin the hub and blades according to the design dimensions, and machine the shaft hole in the middle of the hub; Step 2: Select a wheel locating seat that corresponds to the wheel size, install the wheel locating seat onto the locating bracket, and then install the wheel rim onto the wheel locating seat; Step 3: Select the blade fixture corresponding to the blade, install the blade fixture onto the auxiliary frame, and then install and position the blade onto the blade fixture; Step 4: Adjust the blade clamp. Move the blade clamp along the auxiliary frame towards the hub. The blade clamp will drive the blade to move synchronously. Adjust the positioning height of the hub until the blade and the side wall of the hub at the corresponding height are in contact and fit together. Lock the blade clamp. Step 5: Use a welding device to weld and fix the connection between the blade and the hub.

2. The method for manufacturing the blades of an axial flow fan according to claim 1, characterized in that: The positioning frame includes a fixed frame and an adjustable frame. The fixed frame is provided with a fixing hole, and the adjustable frame is adjustablely mounted on the fixed frame.

3. The method for manufacturing the blades of an axial flow fan according to claim 2, characterized in that: In step two, the installation and positioning steps for the wheel hub are as follows: (1) The hub positioning seat includes a base and a positioning stud. The positioning stud matches the shaft hole. The base is provided with a positioning groove. The adjustment bracket is provided with a positioning block. The positioning groove and the positioning block correspond one-to-one. The top surface of the positioning block is provided with an extension stud. (2) The positioning slots and positioning blocks are matched one by one, and the positioning blocks are snapped into the corresponding positioning slots to realize the positioning snapping of the base on the adjustment frame. At the same time, the extension studs pass through the positioning slots. (3) Screw the fastening nut into the top of the extension stud and tighten it to fix the hub positioning seat on the adjustment frame; (4) Place the hub on the positioning stud, then screw the lock nut into the end of the positioning stud and tighten the lock nut to press the hub.

4. The method for manufacturing the blades of an axial flow fan according to claim 1, characterized in that: In step three, the blade installation and positioning steps are as follows: (1) The blade clamp includes a sliding rod, a positioning sleeve and a clamping plate. The positioning sleeve is fixedly connected to the sliding rod. The positioning sleeve is provided with a slot, which matches the blade. The bottom end of the sliding rod is provided with a sliding seat, and the sliding seat is provided with a dovetail groove. The auxiliary frame is provided with a dovetail slide. (2) The sliding seat is connected to the dovetail slide rail by the dovetail slide groove, and the clamping screw is tightened to limit and fix the sliding seat; (3) Place the blade into the slot, and the outer side wall of the blade is matched and snapped into the slot; (4) Install the clamping plate. The clamping plate is provided with a positioning handle and a through hole. The sliding rod is provided with a limit stud. The limit stud matches the through hole. Align the through hole with the limit stud. Position the positioning handle on the limit stud. Then move the clamping plate downward so that the clamping plate gradually moves into the slot and presses against the top surface of the blade. Finally, screw the fixing nut into the end of the limit stud and lock it in place.

5. The method for manufacturing the blades of an axial flow fan according to claim 4, characterized in that: In step four, the adjustment steps of the blade clamp are as follows: loosen the tightening screw, move the sliding seat along the dovetail slide towards the hub, the sliding seat drives the positioning sleeve fixed thereto to move synchronously, the positioning sleeve drives the blade to move synchronously, until the inner sidewall of the blade abuts and adheres to the outer sidewall of the hub.

6. The method for manufacturing the blades of an axial flow fan according to claim 2, characterized in that: In step four, the wheel hub positioning height adjustment steps are as follows: (1) The adjustment frame includes a support platform and an adjustment screw. The adjustment screw is circumferentially distributed on the bottom surface of the support platform. The fixed frame includes a fixed base plate and a lifting column. The lifting column is fixed on the fixed base plate. An outer expansion plate is fixedly connected to the outer side wall of the top of the lifting column. A through-hole groove is provided on the outer expansion plate. The through-hole groove corresponds to the adjustment screw. The adjustment screw passes through the corresponding through-hole groove and is clamped and fixed on the outer expansion plate by two clamping nuts. (2) Loosen the clamping nut and move the adjusting screw. The adjusting screw is always inserted into the through-hole groove. The adjusting screw drives the support platform to move synchronously. The support platform then drives the wheel hub positioning seat fixed to it to move synchronously, thereby realizing the adjustment of the wheel hub positioning height on the wheel hub positioning seat. When the wheel hub height is adjusted to the right position, tighten the clamping nut.

7. A method for manufacturing the blades of an axial flow fan according to claim 6, characterized in that: In the wheel hub positioning height adjustment step, the bottom surface of the support platform is equipped with a guide column, and the center of the lifting column is equipped with a guide groove. The guide column matches the guide groove, and the guide column is vertically limited in the guide groove. When the adjustment screw is moved to adjust the wheel hub height, the guide column is always limited in the guide groove and slides vertically along the guide groove.

8. The method for manufacturing the blades of an axial flow fan according to claim 1, characterized in that: After the blades and hub are welded together, the assembled workpiece is removed, the weld is inspected, and then the weld is ground.

9. A method for manufacturing the blades of an axial flow fan according to claim 8, characterized in that: The steps for removing the workpiece are as follows: (1) Rotate the lock nut to remove it from the locating stud; (2) Rotate the fixing nut to remove it from the limiting stud, move the positioning handle along the limiting stud, and the positioning handle will drive the clamping plate to move synchronously, releasing the clamping on the blade until the positioning handle is completely removed from the limiting stud and the clamping plate is removed. (3) Then remove the workpiece after the blades and hub are welded.

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