Method for adjusting blade setting angle of large tubular rotor

Abstract

The invention relates to the field of hydroelectric power generation equipment, and discloses a method for adjusting a mounting angle of a runner blade of a tubular turbine unit, which comprises the following steps of: respectively processing a rotating arm positioning pin hole and a blade positioning pin hole by adopting a boring template for positioning, finely processing the rotating arm positioning pin hole according to the drawing size, finely processing the positioning pin hole according to the blade allowance of 10mm, and adjusting the mounting angle of the runner blade of the tubular turbine unit; when the blade is assembled with the runner hub and the rotating arm, a variable-diameter positioning pin is adopted for positioning and assembling, the blade placement angle size is checked, finally, the position of a blade positioning pin hole is adjusted according to the measured placement angle, and the blade pin hole is subjected to finish machining to the drawing size. By the adoption of the method for adjusting the installation angle of the blades of the large tubular runner, the adjustment work of the installation angle of the blades of a compact runner assembly of a large tubular unit structure can be effectively achieved, the operation stability and reliability of a hydropower station unit are effectively improved, and the method has the advantages of being reliable, stable, high in universality and the like; and the device can also be applied to synchronism adjustment of an axial-flow type unit or other similar synchronous rotating mechanisms.

Description

Technical Field

[0001] The invention relates to the field of hydropower generation equipment, and in particular to a method for adjusting the placement angle of large-scale crossflow runner blades. Background Art

[0002] The turbine runner is the core component of the hydro-generator set. The manufacturing of the runner represents the comprehensive development and research level and capability of the unit. The runner of the tubular unit adopts the blade linkage method to adjust the blade rotation angle according to the unit output to obtain the maximum unit efficiency. Usually, the runner of the tubular unit is equipped with 3 to 6 blades. When installing the blades, it is necessary to set the relative angle of each blade to no more than ±15' to ensure that each blade has the same angle at the same control position, thereby ensuring that each blade is subjected to the same force. The initial adjustment of the blade angle is called the adjustment of the blade placement angle.

[0003] The traditional cross-flow unit impeller blade angle adjustment adopts the method of adding a gasket between the relay cylinder and the ear handle bolt. According to the actual measurement data of the blade angle, the actual thickness of the gasket is calculated when all blades are adjusted to the same angle. The blade angle is adjusted to a uniform size by using the method of matching the gasket thickness.

[0004] With the development of turbine runner technology, in order to obtain greater efficiency and power generation, the wheel-hub ratio of the runner of the tubular unit is getting larger and larger, resulting in the runner body of the runner with the same outer diameter becoming smaller and smaller. In order to save space, many tubular runners cancel the connecting rod and ear handle structure, directly connect the connecting rod to the relay cylinder, and no longer set the ear handle and gasket structure for adjusting the placement angle. This structure greatly increases the difficulty of adjusting the placement angle of the runner blades. Therefore, it is necessary to develop a reliable, versatile and accurate method for adjusting the placement angle of the runner blades of the tubular unit. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for adjusting the blade angle of a large-scale crossflow impeller, which can ensure the accuracy and reliability of the adjustment of the blade angle of the shaft and the crossflow unit impeller through technological means without adjusting the blade angle with gaskets, thereby effectively ensuring the stability and reliability of the operation of the hydropower station unit.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] S1. Make the locating pin hole boring template and the reducing tool locating pin;

[0008] S2, machining of the locating pin holes of the rotating arm;

[0009] S3, blade positioning pin hole processing;

[0010] S4. Runner assembly and blade placement angle measurement;

[0011] S5. Process the positioning pin holes of the blades after assembly.

[0012] Furthermore, the S1 manufacturing of the locating pin hole boring template and the tool locating pin is divided into two steps:

[0013] S11. Design and manufacture the positioning boring template according to the positioning pin hole and positioning stop of the runner blade. The boring template is provided with convex and concave stops according to the blade and the stop of the rotating arm, and the single-side clearance is 0.02-0.05mm. The boring template is processed according to the theoretical position of the blade handle hole and the positioning pin hole to process the alignment hole of the handle and the positioning pin;

[0014] S12. According to the theoretical diameter ΦD of the locating pin, make two ΦD / (ΦD-10) mm reducing tool locating pins.

[0015] Furthermore, the S2 arm positioning pin hole processing is divided into seven steps:

[0016] S21. Place the rotating arm on the gantry milling machine with the large surface of the flange facing upwards, and level the large surface of the flange within 0.02mm;

[0017] S22. Assemble the boring template on the arm flange, adjust the boring template stopper to be consistent with the arm stopper, the point clearance should be within 0.01mm, and measure the clearance between the boring template and the arm flange. The feeler gauge should not enter within 0.02mm.

[0018] S23. The included angle W° between the locating pin hole on the boring template and the centerline of the arm ear hole measured by the gantry milling machine should be in accordance with the angle dimension on the drawing. The error is qualified within 0.05′. If there is an error, it needs to be adjusted manually.

[0019] S24. The fitter cooperates with the gantry milling machine to measure and adjust the angle W° between the boring template and the rotating arm to meet the requirements of the drawing;

[0020] S25. Press the boring template and the rotating arm, and recheck the assembly and alignment results;

[0021] S26. Align the pin hole position on the boring template, and rough and fine bore the blade positioning pin hole on the rotating arm. The pin hole is processed according to the final design size ΦD;

[0022] S27. Remove the boring die and wait for the wheel assembly.

[0023] Furthermore, the S3 blade positioning pin hole processing is divided into seven steps:

[0024] S31. Hang the blade on the V-shaped iron of the boring machine, with the blade flange facing the boring machine, and use the blade flange to align the joint plane. The point readings are the same, and the allowable error is 0.01mm. After passing the test, press the blade tightly and re-check the alignment results to be qualified.

[0025] S32. Assemble the boring template and the blade, adjust the clearance between the boring template stop and the blade stop to be consistent, the clearance should be within 0.01mm, and measure the clearance between the boring template and the blade flange. The feeler gauge should not enter within 0.02mm.

[0026] S33. Use laser tracker to measure the relative angle W° between the No. 1 positioning pin hole of the boring template and the blade profile, which meets the requirements of the design drawing. The error is qualified within 0.05′. If there is an error, manual adjustment is required;

[0027] S34. The fitter cooperates with the laser tracker to measure and adjust the relative angle W° between the boring template and the blade profile to meet the requirements of the design drawings;

[0028] S35. Press the boring template and blade, and recheck the assembly and alignment results;

[0029] S36. Align the pin hole position on the boring template, and rough and semi-finish boring the positioning pin hole on the blade. The pin hole is finally processed according to the design size with a reserve of 10mm, i.e. ΦD-10mm;

[0030] S37 removes the boring die and waits for the blades and impeller to be assembled.

[0031] Furthermore, the S4 runner assembly and blade placement angle measurement are divided into four steps:

[0032] S41, assembling the rotating arm to the installation position in the rotating wheel body;

[0033] S42, assembling the servomotor, the connecting plate, etc. with the rotating arm to form an integral transmission mechanism;

[0034] S43, assemble the blades onto the rotor body, and use two ΦD / (ΦD-10) mm reducing locating pins to locate the blades and the rotating arm;

[0035] S44, using a laser tracker to measure the placement angles α1, α2, α3, ... of each blade at the fully closed position, and calculating the relative angle △α and adjustment direction of each blade that needs to be adjusted according to the measured actual angles;

[0036] Calculation formula: △α=αn-αmin;

[0037] Among them, △α≤15′ is qualified and no adjustment is required.

[0038] Furthermore, the S5 assembly back blade positioning pin hole processing is divided into seven steps:

[0039] S51, re-align the blade on the boring machine according to sequence S31 to sequence S37, and align the boring template and the blade flange pin hole position according to the original processing pin hole position;

[0040] S52, according to the relative angle △α and adjustment direction of each blade that needs to be adjusted measured and calculated during the assembly of the runner in sequence S44, readjust the position of the boring template to press the boring template and the blade, and recheck the assembly and alignment results;

[0041] S53, align the pin hole position on the boring template, and rough and fine bore the positioning pin hole on the blade. The pin hole is finally processed according to the designed size ΦD;

[0042] S54. For blades without errors, align the positioning pin holes according to the original single hole, and process the pin holes to the final design size ΦD;

[0043] S55. Remove the boring template, reassemble the blades with the runner, and use the product positioning pins to position the blades and the rotating arm;

[0044] S56. After the blades are assembled, use a laser tracker to re-measure the placement angle of each blade in the fully closed position to see if it meets the requirements of the design drawings;

[0045] S57. Disassemble the runner assembly and send all the parts of the runner to the construction site.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The invention has the characteristics of reliability, stability, strong versatility, etc., and can ensure that the blade placement angle is adjusted once and for all, and the secondary processing of the blade pin hole is a secondary guarantee of the blade placement angle.

[0048] The present invention can effectively solve the problem of canceling the adjustment of the placement angle of the gasket in a large-scale tubular unit due to its compact structure, and complete the adjustment of the placement angle of the runner blades, thereby effectively improving the operating stability and reliability of the hydropower station unit.

[0049] The present invention can effectively reduce the number of times of assembly, disassembly and assembly of the runner, reduce the assembly cycle and assembly difficulty of the runner, and improve the quality and efficiency of the runner assembly.

[0050] The present invention has universality and can be applied to the design and adjustment scheme of the assembly placement angle of an axial flow wheel, and can also be applied to the synchronization adjustment of other similar synchronous rotation mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 The boring die and the reducing tool positioning pin of the present invention;

[0052] Figure 2 This is a machining diagram of the locating pin hole of the rotating arm of the present invention;

[0053] Figure 3 This is a processing diagram of the blade positioning pin hole of the present invention;

[0054] Figure 4 This is a schematic diagram of the initial assembly structure of the blade and the rotating arm of the present invention;

[0055] Figure 5 It is a schematic diagram of the final assembly of the rotating wheel of the present invention.

[0056] Description of the reference numerals in the accompanying drawings:

[0057] 1-boring template; 2-reducing tool locating pin; 3-swivel arm; 4-blade; 5-rotor body; 6-laser tracker; 7-product locating pin; 8-handle bolt; 9-rotor body; 10-connecting plate; 11-relay; 12-center of gravity of swivel arm ear hole; 13-center of swivel arm pin hole; 14-theoretical center of blade; 15-center of blade pin hole. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Specific implementation method 1: refer to Figures 1 to 4 This embodiment describes a method for adjusting the blade placement angle of a large crossflow runner, which is implemented by the following steps:

[0060] S1. Make the locating pin hole boring template and the reducing tool locating pin;

[0061] S2, machining of the locating pin holes of the rotating arm;

[0062] S3, blade positioning pin hole processing;

[0063] S4. Runner assembly and blade placement angle measurement;

[0064] S5. Process the positioning pin holes of the blades after assembly.

[0065] In this embodiment, the large-scale cross-flow unit cancels the gasket adjustment of the placement angle due to its compact structure, and the assembly and disassembly of the impeller is very time-consuming and laborious. Based on the above reasons, the locating pin holes of the swivel arm and the blades are processed using a boring template to ensure the relative position accuracy of the locating pin holes on the swivel arm and the locating pin holes on the blades. At the same time, because the swivel arm cannot be disassembled again for secondary processing after being installed in the impeller body, the swivel arm is finely processed into the finished locating pin holes according to the theoretical position at one time using a boring die, and the blade locating pin holes are reserved for processing with a 10mm margin. During the assembly of the impeller, the blade placement angle is checked by positioning with a tool locating pin with a variable diameter, and a margin is reserved for subsequent adjustment. The assembly after the swivel arm is finely processed can ensure that the impeller assembly is no longer disassembled, which can significantly reduce the impeller assembly cycle, improve the impeller assembly efficiency, and reduce the assembly difficulty. At the same time, relying on a laser tracker to assist in the measurement of the blade placement angle and the processing of the locating pin holes can effectively improve the accuracy of the blade locating pin hole processing and improve the accuracy of the blade placement angle assembly.

[0066] Specific implementation method 2: refer to Figure 1 This embodiment is described. This embodiment further limits step 1 described in the specific embodiment 1. In this embodiment, the step S1 of making the locating pin hole boring template and the tool locating pin is divided into two steps:

[0067] S11. Design and manufacture a positioning boring template 1 according to the positioning pin holes and positioning stoppers of the runner blades. The boring template 1 is provided with convex and concave stoppers in accordance with the stoppers of the blades 4 and the rotating arm 3, and the single-side clearance is 0.02-0.05 mm. The boring template is processed according to the theoretical positions of the joint holes and positioning pin holes of the blades 4 to process the alignment holes of the joint holes and the positioning pins;

[0068] S12, according to the theoretical diameter ΦD of the locating pin, make two ΦD / (ΦD-10) mm reducing tool locating pins 2;

[0069] In this embodiment, boring templates and tool diameter-changing locating pins are made in advance according to the positions of the locating pin holes of the runner blades and the rotating arm, providing positioning tooling for the blade and rotating arm processing. Using diameter-changing locating pins instead of product locating pins not only ensures the accuracy of assembly, but also reserves margin for the subsequent blade placement angle adjustment.

[0070] Specific implementation method three: refer to Figure 2 This embodiment is described. This embodiment further limits step 2 described in the specific embodiment 1. In this embodiment, the S2 arm positioning pin hole processing is divided into seven steps:

[0071] S21, place the rotating arm 3 on the gantry milling machine with the large surface of the flange facing upwards, and level the large surface of the flange within 0.02mm;

[0072] S22. Assemble boring template 1 on the flange of rotating arm 3, adjust the point clearance between the stop of boring template and the stop of rotating arm to be consistent, the point clearance should be within 0.01mm, measure the clearance between the joint plane of boring template 1 and the flange of rotating arm 3, the feeler gauge should not enter within 0.02mm;

[0073] S23, the gantry milling machine measures the angle W° between the center line of the positioning pin hole on the boring template 1 and the ear hole of the rotating arm 3, which is in accordance with the angle dimension of the drawing. The error is qualified within 0.05′. If there is an error, it needs to be adjusted manually;

[0074] S24. The fitter cooperates with the gantry milling machine to measure and adjust the angle W° between the boring template 1 and the rotating arm 3 to meet the requirements of the drawing;

[0075] S25, pressing the boring template 1 and the rotating arm 3, and rechecking the assembly and alignment results;

[0076] S26, align the pin hole position on the boring template 1, and roughly and finely bore the blade positioning pin hole on the rotating arm 3. The pin hole is processed according to the final design size ΦD;

[0077] S27, remove boring die 1 and wait for the wheel assembly.

[0078] In this embodiment, a boring template is used to accurately position and process the locating pin holes on the rotating arm. When assembling the boring template, a gantry milling machine is required to measure the angle between the locating hole on the boring template and the center line of the ear hole of the rotating arm, so as to review and adjust the final processed locating pin holes of the rotating arm to make them as close to the designed theoretical position as possible, thereby reducing the assembly error during the subsequent assembly of the runner. Since the assembly and disassembly of the runner is very time-consuming and labor-intensive, the locating pin holes of the rotating arm need to be finely processed to the size of the drawing. This solution is more accurate than the previous processing solution for the pin holes of the rotating arm, and makes each rotating arm interchangeable, reducing the difficulty of subsequent unit maintenance.

[0079] Specific implementation method 4: refer to Figure 3 This embodiment is described. This embodiment further limits step 3 described in the specific embodiment 1. In this embodiment, the S3 blade positioning pin hole processing is divided into seven steps:

[0080] S31. Hang blade 4 on the V-shaped iron of the boring machine, with the flange of blade 4 facing the boring machine, and align the joint plane with the flange of blade 4. The point readings are the same, and the allowable error is 0.01mm. After passing the test, press the blade tightly and re-check the alignment result to be qualified;

[0081] S32, assemble the boring template 1 and the blade 4, adjust the point clearance between the stop of the boring template 1 and the stop of the blade 4 to be consistent, the point clearance should be within 0.01mm, measure the clearance between the boring template 1 and the flange of the blade 4, the feeler gauge should not enter within 0.02mm;

[0082] S33. Use a laser tracker to measure the relative angle W° between the No. 1 positioning pin hole of the boring template 1 and the blade 4 profile line, which meets the requirements of the design drawing. The error is qualified within 0.05′. If there is an error, manual adjustment is required;

[0083] S34. The fitter cooperates with the laser tracker to measure and adjust the relative angle W° between the boring template 1 and the blade 4 profile to meet the requirements of the design drawing;

[0084] S35, pressing the boring template 1 and the blade 4, and rechecking the assembly and alignment results;

[0085] S36, align the pin hole position on the boring template 1, and roughly and semi-finish boring the positioning pin hole on the blade 4. The pin hole is finally processed according to the design size with a reserved 10mm, i.e. ΦD-10mm;

[0086] S37, remove the boring die 1 and wait for the blades and the runner to be assembled.

[0087] In this embodiment, a laser tracker is used to assist in aligning the relative angle between the boring template and the blade profile, so that the assembly position accuracy of the boring die is more accurate and more in line with the theoretical position of the design drawing. A 10mm margin is reserved for the processing of the blade locating pin hole, so that when the installation angle of the subsequent runner assembly is measured, if the installation angle exceeds the tolerance of the design drawing, a secondary adjustment margin is reserved.

[0088] Specific implementation method five: refer to Figure 4 This embodiment is described. This embodiment further limits step 4 described in the specific embodiment 1. In this embodiment, the S4 runner assembly and blade placement angle measurement are divided into four steps:

[0089] S41, assembling the rotating arm 3 to the installation position in the rotating wheel body 5;

[0090] S42, assembling the servomotor 9, the connecting plate 10 and the rotating arm 3 to form an integral transmission mechanism;

[0091] S43, assembling the blade 4 onto the rotor body 5, and positioning the blade 4 and the rotating arm 3 using two ΦD / (ΦD-10) mm diameter reducing tool positioning pins 2;

[0092] S44. Use the laser tracker 6 to measure the placement angles α1, α2, α3, ... of each blade in the fully closed position. Calculate the relative angle △α and the adjustment direction of each blade 4 that needs to be adjusted according to the actual measured angles. The calculation formula is △α=αn-αmin, where △α≤15′ is acceptable and no adjustment is required.

[0093] In this embodiment, when assembling the rotor, the rotating arm and the blade are positioned using a tool positioning pin with a variable diameter to ensure the accuracy of the blade assembly position. After assembly, a laser tracker is used to assist in measuring the placement angle, which is more accurate than the conventional hanging wire measurement method and can improve the accuracy and efficiency of blade placement angle measurement.

[0094] Specific implementation method six: refer to Figure 5 and Figure 3 This embodiment is described. This embodiment further limits step 5 described in the specific embodiment 1. In this embodiment, the processing of the positioning pin hole of the blade after assembly in S5 is divided into seven steps:

[0095] S51, re-align the blade 4 on the boring machine according to the sequence S31 to S37, and align the boring template 1 and the flange pin hole position of the blade 4 according to the original processing pin hole position;

[0096] S52, according to the relative angle △α and adjustment direction of each blade that needs to be adjusted measured and calculated during the assembly of the runner in sequence S44, readjust the position of the boring template 1 to press the boring template 1 and the blade 4, and recheck the assembly and alignment results;

[0097] S53, align the pin hole position on the boring template 1, and roughly and finely bore the positioning pin hole on the blade 4. The pin hole is finally processed according to the designed size ΦD;

[0098] S54, for blade 4 without error, align the positioning pin hole according to the original single hole, and process the pin hole to the final design size ΦD;

[0099] S55, dismantle the boring template 1, reassemble the blade 4 with the runner, and position the blade 4 and the rotating arm 3 using the product positioning pin 7;

[0100] S56. After the blades 4 are assembled, the laser tracker 6 is used to re-measure the placement angle of each blade 4 in the fully closed position to see if it meets the requirements of the design drawings;

[0101] S57. Disassemble the runner assembly and send all the parts of the runner to the construction site.

[0102] In this embodiment, according to whether the blade placement angle meets the requirements of the design drawings during the assembly of the runner, the positioning pin holes on the blades are fine-machined to the drawing size. The blades that meet the requirements of the drawings can be aligned according to the original single-hole pin holes and directly processed to the drawing size. For the blades that exceed the requirements of the design drawings, the boring mold is re-assembled, and the angle is adjusted according to the actual needs, and then the second alignment and fine machining are performed. The entire adjustment process only requires the removal and installation of the blades, which reduces the number of removal and installation times and the assembly cycle of the runner assembly.

[0103] The above description of the basic principle and main process of the present invention is combined with the accompanying drawings. The technicians in this industry should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A method for adjusting the blade placement angle of a large crossflow impeller, comprising the following steps: S1. Make the locating pin hole boring template and the reducing tool locating pin; S2, machining of the locating pin holes of the rotating arm; S3, blade positioning pin hole processing; S4. Runner assembly and blade placement angle measurement; S5. Process the positioning pin holes of the blades after assembly.

2. A method for adjusting the placement angle of a large crossflow impeller blade according to claim 1, characterized in that: The S1 further comprises: S11. Design and manufacture a positioning boring template (1) according to the positioning pin hole and positioning stop of the runner blade. The boring template (1) is provided with convex and concave stops in accordance with the stops of the blade (4) and the rotating arm (3). The single-side clearance is 0.02 to 0.05 mm. The boring template is processed according to the theoretical position of the joint hole and the positioning pin hole of the blade (4) to process the joint hole and the positioning pin to align the hole; S12. According to the theoretical diameter ΦD of the locating pin, two ΦD / ΦD-10 mm reducing tool locating pins (2) are manufactured.

3. A method for adjusting the placement angle of a large crossflow impeller blade according to claim 1, characterized in that: The S2 further includes: S21. Place the rotating arm (3) on the gantry milling machine with the large surface of the flange facing upwards, and level the large surface of the flange within 0.02 mm; S22. Assemble the boring plate (1) on the flange of the rotating arm (3), adjust the clearance between the stop of the boring plate and the stop of the rotating arm to be consistent, the clearance should be within 0.01mm, and measure the clearance between the joint plane of the boring plate (1) and the flange of the rotating arm (3). The feeler gauge should not be more than 0.02mm. S23, the gantry milling machine measures the angle W° between the positioning pin hole on the boring template (1) and the center line of the ear hole of the rotating arm (3) to meet the angle dimension of the drawing. The error is within 0.05′, which is acceptable. If there is an error, it needs to be adjusted manually; S24. The fitter cooperates with the gantry milling machine to measure and adjust the relative position angle W° between the boring template (1) and the rotating arm (3) to meet the requirements of the drawing; S25, pressing the boring template (1) and the rotating arm (3), and rechecking the assembly and alignment results; S26, align the pin hole position on the boring template (1) by single hole, and roughly and finely bore the blade positioning pin hole on the rotating arm (3), and the pin hole is processed according to the final design size ΦD; S27, remove the boring die (1) and wait for the wheel to be assembled.

4. A method for adjusting the placement angle of a large crossflow impeller blade according to claim 1, characterized in that: The S3 further includes: S31, hang the blade (4) on the V-shaped iron of the boring machine, with the flange of the blade (4) facing the boring machine, align the joint plane with the flange of the blade (4), and make the point readings the same, with an allowable error of 0.01mm. After passing the test, press the blade tightly, and re-check the alignment result to be qualified; S32. Assemble the boring template (1) and the blade (4). Adjust the clearance between the stopper of the boring template (1) and the stopper of the blade (4) to be consistent. The clearance should be within 0.01mm. Measure the clearance between the flange of the boring template (1) and the blade (4). The feeler gauge should not enter within 0.02mm. S33. Use a laser tracker to measure the relative angle W° between the No. 1 positioning pin hole of the boring template (1) and the profile of the blade (4). The angle meets the requirements of the design drawing. The error is within 0.05′, which is acceptable. If there is an error, manual adjustment is required. S34, the fitter cooperates with the laser tracker to measure and adjust the relative angle W° between the boring template (1) and the profile of the blade (4) to meet the requirements of the design drawing; S35, pressing the boring template (1) and the blade (4), and rechecking the assembly and alignment results; S36, aligning the pin hole position on the boring template (1) by single hole, rough and semi-finish boring the positioning pin hole on the blade (4), and the pin hole is finally processed according to the design size with a reserved 10mm, i.e. ΦD-10mm; S37, remove the boring die (1), and wait for the blades and the runner to be assembled.

5. A method for adjusting the placement angle of a large crossflow impeller blade according to claim 1, characterized in that: The S4 further comprises: S41, assembling the rotating arm (3) to the installation position in the rotating wheel body (5); S42, assembling the servomotor (9), the connecting plate (10), etc., and the rotating arm (3) to form an integral transmission mechanism; S43, assembling the blade (4) onto the rotor body (5), and positioning the blade (4) and the rotating arm (3) using two ΦD / ΦD-10mm diameter reducing positioning pins (2); S44. Use a laser tracker (6) to measure the placement angles α1, α2, α3, ... of each blade in the fully closed position, and calculate the relative angle △α and adjustment direction that each blade (4) needs to adjust according to the actual measured angles. The calculation formula is △α=αn-αmin, where △α≤15′ is acceptable and no adjustment is required.

6. A method for adjusting the placement angle of large crossflow impeller blades according to claim 1, characterized in that: The S5 further includes: S51, re-aligning the blade (4) on the boring machine according to sequence S31 to sequence S37, and aligning the position of the boring template (1) and the flange pin hole of the blade (4) according to the original processing pin hole position; S52, according to the relative angle △α and adjustment direction of each blade that needs to be adjusted measured and calculated during the assembly of the runner in sequence S44, readjust the position of the boring template (1) to press the boring template (1) and the blade (4), and recheck the assembly and alignment results; S53, aligning the pin hole position on the boring template (1) by single hole, rough and fine boring the positioning pin hole on the blade (4), and finally machining the pin hole according to the designed size ΦD; S54, for the blade (4) without error, align the positioning pin hole according to the original single hole, and process the pin hole to the final design size ΦD; S55, the boring template (1) is removed, the blade (4) is reassembled with the runner, and the blade (4) and the rotating arm (3) are positioned using the product positioning pin (7); S56, after the blades (4) are assembled, a laser tracker (6) is used to re-measure the placement angle of each blade (4) at the fully closed position to ensure that it complies with the requirements of the design drawings; S57. Disassemble the runner assembly and send all the parts of the runner to the construction site.

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