Blade balancing fixture, blade interlocking rotor balancing method

Abstract

The present invention discloses a blade balancing fixture and a balancing method for a blade interlocking rotor, wherein the blade balancing fixture utilizes a balancing base and a balancing cover plate to perform axial and radial limiting on a whole disc of blades, and adjacent blades are axially limited by a folded blade crown to prevent the blades from axially shifting and radially flying out when an unbalance inspection is performed on a balancing machine, and there is no need to use a wheel disc to perform an unbalance inspection, and the wheel disc balancing and the blade balancing can be performed separately and synchronously, thereby changing a serial process into a parallel process and improving the rotor assembly efficiency, and when the blade position needs to be adjusted, there is no need to use a whole disc of blade disassembly and assembly tools, and the blade position can be directly changed on the balancing machine, thereby reducing the number of times the balancing machine is raised and lowered, and also eliminating the need for the rotor hoisting process between the balancing machine and the assembly frame, thereby greatly improving the assembly efficiency of the blade interlocking rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor assembly, and in particular to a blade balancing fixture. In addition, the present invention also particularly relates to a balancing method for a blade interlocking rotor, which adopts the blade balancing fixture. Background Art

[0002] Large aircraft engine turbines usually manufacture blades and disks separately, and then need to be balanced after being assembled into a rotor. The normal process is disk assembly-disk balancing-blade disk assembly-blade disk balancing. When assembling the disk, the imbalance of the components on the disk must be known in advance, and the weights and masses must be staggered based on experience. The weight moment is measured before the blades are assembled, and multiple blades are cross-arranged in four quadrants according to the weight moment to make the weight moment as uniform as possible. In fact, the staggered weights and masses and the cross-arrangement in four quadrants based on experience cannot make the imbalance of the assembled rotor reach the expected level, and the relative positions of the disk and blades still need to be adjusted. In particular, some engine rotor blades have a crown on the top, and the crown is folded, which fits with the adjacent blades to achieve blade interlocking and prevent axial movement of the blades, such as Figure 1 As shown. Due to mutual interference, this type of blades can only be assembled into a complete circle and then installed into the wheel disc axially using a special blade disassembly and assembly tool. Similarly, when adjusting the blade position, it is also necessary to use the blade disassembly and assembly tool to remove the entire disc of blades from the wheel disc before the blade position can be adjusted. The overall disassembly and assembly tool has a complex structure, is difficult to use, and has low processing accuracy, resulting in the entire disc of blades taking more than three times the time required for disassembly and assembly than the ordinary assembly process, which is a bottleneck restricting rotor assembly. In addition, large engine rotors have a large mass and need to be transferred between tools and balancing machines with the help of a hoist. The time required to move the rotor using a hoist is twice that of the ordinary assembly process. When performing rotor balancing adjustments, the actual number of adjustments to the blade position is at least 2 times, and the number of times the rotor is hoisted between the balancing machine and the assembly frame is at least 5 times, which greatly affects the rotor assembly efficiency. Summary of the invention

[0003] The invention provides a blade balancing fixture and a blade interlocking rotor balancing method to solve the technical problem of low assembly efficiency of the existing blade interlocking rotor.

[0004] According to one aspect of the present invention, there is provided a blade balancing fixture for installation on a balancing machine to balance and adjust an entire disk of blades, comprising a balancing base, a balancing cover plate, a positioning shaft and a clamping nut. The balancing base is installed on the balancing machine, the balancing cover plate is coaxially installed on the balancing base through the positioning shaft, the entire disk of blades is installed between the balancing base and the balancing cover plate, the entire disk of blades is radially and axially limited by the balancing base and the balancing cover plate, the clamping nut is installed on the positioning shaft and is located above the balancing cover plate, and is used to axially press the balancing cover plate onto the entire disk of blades.

[0005] Furthermore, the balancing cover plate and the balancing base are both provided with hollow rings which are symmetrical along the axial direction.

[0006] Furthermore, a first annular groove is provided on the balancing base, and a second annular groove is provided on the balancing cover plate. The inner surface of the blade root tenon boss on the inlet edge of the blade abuts against the inner circumferential surface of the first annular groove, and the outer surface of the blade root tenon boss on the exhaust edge of the blade abuts against the outer circumferential surface of the second annular groove. The blade is radially limited by the first annular groove and the second annular groove, and the blade tenon is in contact with the first axial support surface on the balancing base and the second axial support surface on the balancing cover plate at the same time, and the blade crown is supported on the third axial support surface of the balancing base, and the blade is axially limited by the first axial support surface, the second axial support surface and the third axial support surface.

[0007] In addition, the present invention also provides a balancing method for a blade interlocking rotor, using the blade balancing fixture as described above, comprising the following contents:

[0008] After assembling the wheel, balance it;

[0009] Install the entire blade disc on the blade balancing fixture for balancing;

[0010] Based on the imbalance of the wheel disc and the imbalance of the entire blade disk, it is judged whether the rotor imbalance after the blade assembly meets the requirements. If it meets the requirements, the entire blade disk is assembled on the wheel disc. If it does not meet the requirements, the blade position is adjusted on the blade balancing fixture until the rotor imbalance requirements are met.

[0011] Furthermore, the process of mounting the entire blade disc on the blade balancing fixture for balancing includes the following:

[0012] Install the balancing base on the balancing machine and ensure that the runout of the inner circumferential surface of the first annular groove and the first axial support surface meets the requirements;

[0013] Place the entire set of blades in order on the outer side of the inner circumference of the first annular groove, support the tenon against the first axial support surface, and support the blade crown against the third axial support surface, so that the blades are in a horizontal state;

[0014] Gather all the blades together so that the inner surface of the blade root tenon boss at the air inlet side of the blade abuts against the inner circumferential surface of the first annular groove;

[0015] Align the balance cover plate with the balance engraved line and place it on the exhaust side of the blade, so that the outer surface of the blade root tenon boss on the exhaust side of the blade abuts against the outer circumferential surface of the second annular groove;

[0016] Tighten the compression nut to axially compress the entire blade disc;

[0017] Start the balancing machine and check whether the imbalance of the entire blade is consistent with the expected value.

[0018] Furthermore, the process of mounting the entire blade disc on the blade balancing fixture for balancing also includes the following:

[0019] When the imbalance of the entire set of blades is inconsistent with expectations, loosen the clamping nut, take out the balancing cover, pull out the blade to be replaced radially from the inside to the outside, and install the blade to be installed radially from the outside to the inside. After installing the balancing cover and clamping nut again, check the imbalance until the imbalance of the entire set of blades meets expectations.

[0020] Furthermore, the entire disk of blades is placed on the outer side of the inner circumferential surface of the first annular groove by using a skewed weight method, with blades with large weight moments concentrated on one side and blades with small weight moments concentrated on the other side.

[0021] Further, judging whether the rotor unbalance amount after the blades are assembled meets the requirements based on the unbalance amount of the wheel disc and the unbalance amount of the entire blade disc is specifically as follows:

[0022] Subtract the imbalance of the entire blade from the imbalance of the wheel disc and take the absolute value. If the absolute value is less than the sum of the required imbalance of the rotor and the imbalance caused by adding / removing material, the requirement is met; otherwise, the requirement is not met.

[0023] Furthermore, when assembling the entire blade disk on the wheel disc, the position where the unbalance amount of the entire blade disk is located is staggered by 180° from the position where the unbalance amount of the wheel disc is located for assembly.

[0024] Furthermore, after the entire disk of blades is placed in place, a cotton rope or rubber rope is wound around the blade crown to gather all the blades together, and the cotton rope or rubber rope is removed after the balancing cover plate and the compression nut are installed.

[0025] The present invention has the following effects:

[0026] The blade balancing fixture of the present invention is achieved by installing a balancing base on a balancing machine, and installing a balancing cover plate coaxially with the balancing base through a positioning shaft, installing a whole disk of blades between the balancing base and the balancing cover plate, and axially pressing the balancing cover plate onto the whole disk of blades through a clamping nut, and axially and radially limiting the whole disk of blades by using the balancing base and the balancing cover plate, and axially limiting adjacent blades by using a folded blade crown, so as to prevent the blades from moving axially and flying out radially when the imbalance is checked on the balancing machine. The present invention uses a blade balancing fixture to install a whole disk of blades for imbalance inspection. There is no need to install the blades on the wheel disc for imbalance inspection. The wheel disc balancing and blade balancing can be carried out separately and synchronously, and the serial process is changed to a parallel process, thereby improving the rotor assembly efficiency. In addition, when the blade position needs to be adjusted, since there is no need to use a wheel disc to assemble the blades, the radial movement of the single blade is no longer restricted by the wheel disc tenon groove. Only the clamping nut and the balancing cover plate need to be removed to take out or install the single blade radially. There is no need to use a whole disk blade disassembly tool, and the blade position can be directly changed on the balancing machine, which reduces the number of times the balancing machine is raised and lowered, and also eliminates the hoisting process of the rotor between the balancing machine and the assembly frame, thereby greatly improving the assembly efficiency of the blade interlocking rotor.

[0027] In addition, the balancing method of the blade interlocking rotor of the present invention uses a blade balancing fixture to install the whole disc of blades and balance them on the balancing machine. There is no need to use a wheel disc to assemble the blades. The wheel disc balancing and blade balancing can be carried out separately and simultaneously, creating a precedent for the separate balancing of the wheel disc and the blades. The existing serial process is optimized into a parallel process. The blade balancing and the wheel disc balancing do not interfere with each other, which provides favorable conditions for the mutual matching of multiple wheels and blades, greatly shortens the assembly cycle of the blade interlocking rotor, and improves the rotor assembly efficiency. Moreover, when it is necessary to adjust the blade position, since there is no need to use a wheel disc to assemble the blades, the movement of a single blade in the radial direction is no longer restricted by the tenon groove of the wheel disc. It is only necessary to remove the clamping nut and the balancing cover plate to take out or install the single blade in the radial direction. There is no need to use a whole disc blade disassembly tool. The blade position can be directly changed on the balancing machine, which reduces the number of times the balancing machine is raised and lowered, and also saves the process of hoisting the rotor between the balancing machine and the assembly frame, which greatly improves the assembly efficiency of the blade interlocking rotor.

[0028] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 The present invention is a schematic diagram of the axis limiting between two adjacent blades of the existing blade interlocking rotor through the folded blade crown.

[0031] Figure 2 It is a schematic cross-sectional structure diagram of a blade balancing fixture according to a preferred embodiment of the present invention.

[0032] Figure 3 It is a schematic structural diagram of a balancing base according to a preferred embodiment of the present invention.

[0033] Figure 4 It is a structural schematic diagram of a balancing cover plate according to a preferred embodiment of the present invention.

[0034] Figure 5 yes Figure 2 A local enlarged schematic diagram of the .

[0035] Figure 6 It is a flow chart of a balancing method for a blade interlocking rotor according to another embodiment of the present invention.

[0036] Figure 7 yes Figure 6 Schematic diagram of the sub-process of step S2 in FIG.

[0037] Figure 8 yes Figure 6 Another sub-process diagram of step S2 in FIG.

[0038] Fig. 9 It is a schematic diagram of assembling the unbalanced position of the whole blade and the unbalanced position of the wheel disc by staggering them by 180 degrees in the present invention.

[0039] Fig.10 It is a schematic diagram of blade arrangement when the existing blades and the wheel are assembled. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0041] like Figure 2 As shown, a preferred embodiment of the present invention provides a blade balancing fixture for installation on a balancing machine to balance and adjust the entire disk of blades, comprising a balancing base, a balancing cover plate, a positioning shaft and a clamping nut, the balancing base being installed on the balancing machine, the balancing cover plate being coaxially installed on the balancing base through the positioning shaft, the entire disk of blades being installed between the balancing base and the balancing cover plate, the entire disk of blades being radially and axially limited by the balancing base and the balancing cover plate, the clamping nut being installed on the positioning shaft and located above the balancing cover plate, for axially pressing the balancing cover plate onto the entire disk of blades.

[0042] It can be understood that the blade balancing fixture of the present embodiment is achieved by installing the balancing base on the balancing machine, and installing the balancing cover plate coaxially with the balancing base through the positioning shaft, the entire disc of blades is installed between the balancing base and the balancing cover plate, and the balancing cover plate is axially pressed onto the entire disc of blades by a clamping nut, the balancing base and the balancing cover plate are used to axially and radially limit the entire disc of blades, and the adjacent blades are axially limited by the folded blade crown to prevent the blades from moving axially and flying out radially when the imbalance is checked on the balancing machine. The present invention uses a blade balancing fixture to install a whole disk of blades for imbalance inspection. There is no need to install the blades on the wheel disc for imbalance inspection. The wheel disc balancing and blade balancing can be carried out separately and synchronously, and the serial process is changed to a parallel process, thereby improving the rotor assembly efficiency. In addition, when the blade position needs to be adjusted, since there is no need to use a wheel disc to assemble the blades, the radial movement of the single blade is no longer restricted by the wheel disc tenon groove. Only the clamping nut and the balancing cover plate need to be removed to take out or install the single blade radially. There is no need to use a whole disk blade disassembly tool, and the blade position can be directly changed on the balancing machine, which reduces the number of times the balancing machine is raised and lowered, and also eliminates the hoisting process of the rotor between the balancing machine and the assembly frame, thereby greatly improving the assembly efficiency of the blade interlocking rotor.

[0043] Optionally, the balancing cover plate and the balancing base are both provided with hollow rings symmetrical along the axial direction, which reduces the weight of the clamp and facilitates disassembly and assembly. Figure 3 and Figure 4 As shown, the balancing cover plate and the balancing base are both provided with four hollow rings, and the four hollow rings are evenly and symmetrically distributed.

[0044] Specifically, the balancing cover plate and the balancing base are circular disks. Of course, in other embodiments of the present invention, they may also be square disks or other centrally symmetrical structures. Figure 5As shown, the balancing base is provided with a first annular groove, and the balancing cover is provided with a second annular groove. The width of the first annular groove is greater than that of the first annular groove. The inner surface of the tenon boss of the blade root at the air inlet side of the blade abuts against the inner circumferential surface 1C1 of the first annular groove, and the outer surface of the tenon boss of the blade root at the exhaust side of the blade abuts against the outer circumferential surface 2C1 of the second annular groove. The blade is radially limited by the first annular groove and the second annular groove. Among them, the inner circumferential surface 1C1 of the first annular groove plays a role in limiting the minimum inner diameter of the blade, and the outer circumferential surface 2C1 of the second annular groove plays a role in limiting the maximum outer diameter of the blade. Moreover, the blade tenon is also in contact with the first axial support surface 1A1 on the balancing base and the second axial support surface 2A1 on the balancing cover at the same time, and the blade crown is supported on the third axial support surface 1A2 of the balancing base. The blade is axially limited by the first axial support surface 1A1, the second axial support surface 2A1 and the third axial support surface 1A2. It can be understood that the blade balancing fixture limits the blade axially and radially through the above structure, ensuring that the layout position and posture of the blade on the fixture are consistent with its layout position and posture on the wheel, and preventing the blade from moving axially and flying out radially during balancing.

[0045] In addition, if Figure 6 As shown, the present invention also provides a balancing method for a blade interlocking rotor, using the blade balancing fixture as described above, characterized in that it includes the following contents:

[0046] Step S1: balancing the wheel after assembling;

[0047] Step S2: Mount the entire blade disc on a blade balancing fixture for balancing;

[0048] Step S3: Based on the imbalance of the wheel disc and the imbalance of the entire blade disc, determine whether the rotor imbalance after the blade assembly meets the requirements. If it meets the requirements, assemble the entire blade disc to the wheel disc. If it does not meet the requirements, adjust the blade position on the blade balancing fixture until the rotor imbalance requirements are met.

[0049] It can be understood that step S1 and step S2 can be performed simultaneously.

[0050] It can be understood that the balancing method of the blade interlocking rotor of the present invention uses a blade balancing fixture to install the whole disc of blades and balance them on the balancing machine. There is no need to use a wheel disc to assemble the blades. The wheel disc balancing and the blade balancing can be carried out separately and simultaneously, creating a precedent for the separate balancing of the wheel disc and the blades. The existing serial process is optimized into a parallel process. The blade balancing and the wheel disc balancing do not interfere with each other, which provides favorable conditions for the mutual matching of multiple wheel discs and blades, greatly shortens the assembly cycle of the blade interlocking rotor, and improves the rotor assembly efficiency. In addition, when it is necessary to adjust the blade position, since there is no need to use a wheel disc to assemble the blades, the movement of a single blade in the radial direction is no longer restricted by the wheel disc tenon groove. It is only necessary to remove the clamping nut and the balancing cover plate to take out or install the single blade in the radial direction. There is no need to use a whole disc blade disassembly tool. The blade position can be directly changed on the balancing machine, which reduces the number of times the balancing machine is raised and lowered, and the hoisting process of the rotor between the balancing machine and the assembly frame is omitted, which greatly improves the assembly efficiency of the blade interlocking rotor.

[0051] It is understandable that Figure 7 As shown, the step S2 specifically includes the following contents:

[0052] Step S21: installing the balancing base on the balancing machine, and ensuring that the runout of the inner circumferential surface of the first annular groove and the first axial support surface meets the requirements;

[0053] Step S22: placing the entire set of blades in order on the outer side of the inner circumferential surface of the first annular groove, supporting the tenon on the first axial support surface, supporting the blade crown on the third axial support surface, so that the blades are in a horizontal state;

[0054] Step S23: Gather all the blades together so that the inner surface of the blade root tenon boss at the air inlet side of the blade abuts against the inner circumferential surface of the first annular groove;

[0055] Step S24: aligning the balancing cover plate with the balancing engraved line and placing it on the exhaust side of the blade, so that the outer surface of the blade root tenon boss on the exhaust side of the blade abuts against the outer circumferential surface of the second annular groove;

[0056] Step S25: tighten the compression nut to axially compress the entire blade disk;

[0057] Step S26: Start the balancing machine to check whether the unbalance amount of the entire blade is consistent with the expectation.

[0058] Specifically, in step S21, after the balancing base is installed on the balancing machine, it is necessary to check whether the runout of the inner circumferential surface of the first annular groove and the first axial support surface on the balancing base meets the requirements to ensure the installation accuracy of the balancing base.

[0059] Optionally, in step S22, the whole disk of blades is placed on the outer side of the inner circumference of the first annular groove by using the eccentric weight method, and the blades with large weight moments are concentrated on one side, and the blades with small weight moments are concentrated on the other side. The present invention improves the blade arrangement method into the eccentric weight method, that is, the whole disk of blades is allowed to have a larger imbalance, and the maximum imbalance of the whole disk of blades is obtained by concentrating the blades with large weight moments on one side and the blades with small weight moments on the other side. Compared with the conventional four-image uniform method, since the imbalance of the blades needs to be controlled within the smallest possible range, it is necessary to repeatedly adjust the position of the blades. The eccentric weight method is used to arrange the blades, and the position of the blades basically does not need to be adjusted. Unless in specific circumstances, such as the imbalance of a wheel disc is known, the imbalance of the blades needs to be exactly within a certain range, and the position of the blades needs to be adjusted. Therefore, the present invention uses the eccentric weight method to arrange the blades, and the blade position almost does not need to be adjusted, which reduces the number of blade position adjustments and improves efficiency.

[0060] It can be understood that in step S23, after the entire set of blades is placed in place, a cotton rope or rubber rope is wrapped around the blade crown to gather all the blades together, and the cotton rope or rubber rope is removed after the balancing cover plate and the compression nut are subsequently installed.

[0061] It can be understood that in step S24, after the entire disc of blades are gathered together, the balancing cover is aligned with the exhaust edge of the blade and covered so that the outer surface of the blade root tenon boss on the exhaust edge of the blade abuts against the outer circumferential surface of the second annular groove to achieve radial positioning of the blade tenon.

[0062] It can be understood that in step S25, after the balancing cover plate is covered, the clamping nut is installed into the positioning shaft and tightened, so that the balancing cover plate is axially pressed on the entire disk of blades to achieve axial positioning of the blades.

[0063] It can be understood that in step S26, after the positioning of the entire disk of blades is completed, the balancing machine is started to check whether the imbalance of the entire disk of blades is consistent with the expected result. If it is consistent, the blade balancing fixture and the entire disk of blades are removed from the balancing machine and wait for assembly with the wheel disc.

[0064] Alternatively, if Figure 8 As shown, in another embodiment of the present invention, the step S2 further includes the following contents:

[0065] Step S27: When the imbalance of the entire disk of blades is inconsistent with expectations, loosen the clamping nut, take out the balancing cover, pull out the blade to be replaced radially from the inside to the outside, and install the blade to be installed radially from the outside to the inside. After installing the balancing cover and the clamping nut again, check the imbalance until the imbalance of the entire disk of blades meets expectations.

[0066] Optionally, in step S3, judging whether the rotor unbalance after blade assembly meets the requirement based on the unbalance of the wheel disc and the unbalance of the entire blade disc is specifically as follows:

[0067] Subtract the imbalance of the entire blade from the imbalance of the wheel disc and take the absolute value. If the absolute value is less than the sum of the required imbalance of the rotor and the imbalance caused by adding / removing material, the requirement is met; otherwise, the requirement is not met.

[0068] It can be understood that in addition to blades and discs, there are other components on the rotor. Ultimately, the rotor is required to meet the unbalance requirements when all components are assembled. Therefore, the absolute value of the difference between the unbalance of the disc and the unbalance of the entire disc of blades should be as small as possible from the required unbalance of the rotor + the sum of the unbalance caused by adding or removing material. Assembly should be based on this basis to ensure that the unbalance of the rotor in the final state meets the requirements.

[0069] It is understandable that Fig. 9 As shown, when the whole set of blades is assembled on the wheel disc, the position where the unbalance amount of the whole set of blades is located is staggered by 180° from the position where the unbalance amount of the wheel disc is located for assembly.

[0070] It can be understood that when assembling a wheel in a conventional way, it is necessary to first balance the components on the wheel to obtain their respective unbalance amounts, and then stagger the weights of the components based on experience; before assembling the blades, measure the weight moment of a single blade to the rotating shaft, sort the blades from light to heavy according to the weight moment, and then cross-arrange them in the four quadrants to make the weight moment as uniform as possible, such as Fig.10 As shown. This method has high requirements on the position arrangement of the wheel disc and blades, while the blades of aircraft engines are mostly singular, and the weight moments of the blades are also very dispersed. The weight moments of two blades are randomly different, and it is impossible to arrange them evenly in each quadrant. The actual imbalance will exceed expectations, resulting in the need to use the whole-disk blade disassembly tool to repeatedly disassemble the whole disk of blades and then adjust the blade position, and the assembly efficiency is very low. In the present invention, since the blades are arranged by the eccentric weight method during the balancing process of the whole disk of blades, the whole disk of blades can be treated as a whole, and the exact value of the imbalance of the whole disk of blades can be obtained. When the imbalance of the whole disk of blades is subtracted from the imbalance of the wheel disc and the absolute value is taken to meet the final rotor imbalance requirement, the position where the imbalance of the whole disk of blades is located is staggered by 180° from the position where the imbalance of the wheel disc is located for assembly. The uniform mass difference will minimize the static imbalance of the rotor, and there is no need to repeatedly adjust the blades, which greatly improves the assembly efficiency.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blade balancing fixture, used to be installed on a balancing machine to balance the entire blade, characterized in that: It comprises a balancing base, a balancing cover plate, a positioning shaft and a clamping nut, wherein the balancing base is mounted on a balancing machine, the balancing cover plate is coaxially mounted on the balancing base through the positioning shaft, the whole disk blade is mounted between the balancing base and the balancing cover plate, the whole disk blade is radially and axially limited by the balancing base and the balancing cover plate, the clamping nut is mounted on the positioning shaft and located above the balancing cover plate, and is used to axially press the balancing cover plate onto the whole disk blade; A first annular groove is provided on the balancing base, and a second annular groove is provided on the balancing cover plate. The inner surface of the blade root tenon boss on the inlet edge of the blade abuts against the inner circumferential surface of the first annular groove, and the outer surface of the blade root tenon boss on the exhaust edge of the blade abuts against the outer circumferential surface of the second annular groove. The blade is radially limited by the first annular groove and the second annular groove, and the blade tenon is in contact with the first axial supporting surface on the balancing base and the second axial supporting surface on the balancing cover plate at the same time, and the blade crown is supported on the third axial supporting surface of the balancing base, and the blade is axially limited by the first axial supporting surface, the second axial supporting surface and the third axial supporting surface.

2. The blade balancing fixture according to claim 1, characterized in that: The balancing cover plate and the balancing base are both provided with hollow rings which are symmetrical along the axial direction.

3. A method for balancing a blade interlocked rotor, using the blade balancing fixture as claimed in claim 1 or 2, characterized in that: Includes the following: After assembling the wheel, balance it; Install the entire blade disc on the blade balancing fixture for balancing; Based on the imbalance of the wheel disc and the imbalance of the entire blade disk, it is judged whether the rotor imbalance after the blade assembly meets the requirements. If it meets the requirements, the entire blade disk is assembled on the wheel disc. If it does not meet the requirements, the blade position is adjusted on the blade balancing fixture until the rotor imbalance requirements are met.

4. The balancing method of blade interlocking rotor according to claim 3, characterized in that: The process of balancing the entire blade disc by mounting it on the blade balancing fixture includes the following: Install the balancing base on the balancing machine and ensure that the runout of the inner circumferential surface of the first annular groove and the first axial support surface meets the requirements; Place the entire set of blades in order on the outer side of the inner circumference of the first annular groove, support the tenon against the first axial support surface, and support the blade crown against the third axial support surface, so that the blades are in a horizontal state; Gather all the blades together so that the inner surface of the blade root tenon boss at the air inlet side of the blade abuts against the inner circumferential surface of the first annular groove; Align the balance cover plate with the balance engraved line and place it on the exhaust side of the blade, so that the outer surface of the blade root tenon boss on the exhaust side of the blade abuts against the outer circumferential surface of the second annular groove; Tighten the compression nut to axially compress the entire blade disc; Start the balancing machine and check whether the imbalance of the entire blade is consistent with the expected value.

5. The balancing method of blade interlocking rotor according to claim 4, characterized in that: The process of balancing the entire blade disc by mounting it on the blade balancing fixture also includes the following: When the imbalance of the entire set of blades is inconsistent with expectations, loosen the clamping nut, take out the balancing cover, pull out the blade to be replaced radially from the inside to the outside, and install the blade to be installed radially from the outside to the inside. After installing the balancing cover and clamping nut again, check the imbalance until the imbalance of the entire set of blades meets expectations.

6. The balancing method of blade interlocking rotor according to claim 4, characterized in that: The whole set of blades is placed on the outer side of the inner circumference of the first annular groove by using the eccentric weight method, with blades with large weight moment concentrated on one side and blades with small weight moment concentrated on the other side.

7. The balancing method of blade interlocking rotor according to claim 6, characterized in that: The method of judging whether the rotor unbalance after blade assembly meets the requirements based on the unbalance of the wheel disc and the unbalance of the entire blade disc is as follows: Subtract the imbalance of the entire blade from the imbalance of the wheel disc and take the absolute value. If the absolute value is less than the sum of the required imbalance of the rotor and the imbalance caused by adding / removing material, the requirement is met; otherwise, the requirement is not met.

8. The balancing method of blade interlocking rotor according to claim 7, characterized in that: When assembling the whole set of blades on the wheel disc, the position where the unbalance amount of the whole set of blades is located is staggered by 180 degrees from the position where the unbalance amount of the wheel disc is located for assembly.

9. The balancing method of blade interlocking rotor according to claim 4, characterized in that: After the entire set of blades is in place, use cotton rope or rubber rope to wrap around the blade crown to gather all the blades together, and remove the cotton rope or rubber rope after installing the balancing cover and the compression nut.

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