Blade inner and outer diameter measuring device and measuring method

Abstract

The application discloses a kind of blade inner and outer diameter measuring device and measuring method, belong to aero-engine technical field, it includes mounting plate, rotary through-hole is opened in mounting plate;Six-point positioning assembly, six-point positioning assembly is fixed on mounting plate and is used to fix guide vane, including A2 positioning pin, B5 positioning block, A3 positioning pin, A1 positioning pin, B4 positioning block and C6 positioning pin that are sequentially arranged in the clockwise direction along rotary through-hole Annular arrangement is set;Inner circle table frame and outer circle table frame, inner circle table frame and outer circle table frame are used to install measuring gauge, inner circle table frame and outer circle table frame are swung around rotary through-hole and drive measuring gauge respectively to the inner ring surface and outer ring surface of guide vane are measured.The application simultaneously provides a kind of measuring method including above-mentioned blade inner and outer diameter measuring device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular to a blade inner and outer diameter measuring device. In addition, the present application also relates to a blade inner and outer diameter measuring method comprising the above blade inner and outer diameter measuring device. BACKGROUND

[0002] In the field of aero-engines, during the machining process of the inner and outer arc surfaces of a multi-guide vane, the problem of arc surface size detection is faced. Since the inner and outer edge plates of the guide vane are arc rotary surfaces, it is difficult to measure the inner and outer arc surface sizes: firstly, the special-shaped vane needs to be stably positioned, and then a measuring gauge is used for rotary measurement; secondly, during the measurement, the problem of ensuring that the clamping positioning point does not interfere with the swing detection tool and ensuring that the detection positioning reference and the machining positioning reference are unified to ensure the machining precision and efficiency need to be solved; in addition, the problem of facilitating point value taking for rechecking also needs to be solved, so a special measuring device and measuring method need to be designed. SUMMARY

[0003] The primary object of the present application is to provide a blade inner and outer diameter measuring device to solve the problem of difficult accurate measurement of the inner and outer diameters of the arc rotary surface of the guide vane.

[0004] The present application also provides a blade inner and outer diameter measuring method using the above blade inner and outer diameter measuring device.

[0005] To achieve the above object, the technical scheme adopted by the present application is: a blade inner and outer diameter measuring device for measuring the radii of the inner and outer ring surfaces of a guide vane of an aero-engine, comprising:

[0006] a mounting plate, a rotary through hole is formed in the mounting plate, and the rotary through hole is located at the rotary center of the guide vane;

[0007] a six-point positioning assembly fixed to the mounting plate and used for fixing the guide vane, the six-point positioning assembly comprises A2 positioning pins, B5 positioning blocks, A3 positioning pins, A1 positioning pins, B4 positioning blocks and C6 positioning pins arranged in a ring shape in the clockwise direction along the rotary through hole in sequence, the A2 positioning pins, A3 positioning pins and A1 positioning pins are used for supporting the inner flow passage surface of the guide vane, wherein the A2 positioning pins are detachably mounted on the mounting plate, the B5 positioning blocks and B4 positioning blocks are used for supporting the inlet edges of the guide vane from the bottom, and the C6 positioning pins are used for supporting the backs of the guide vane;

[0008] The inner circle table frame and the outer circle table frame are used for installing measuring gauges, and are installed on the rotating through hole and used for swinging relative to the rotating through hole, thereby driving the measuring gauges to move along the inner and outer annular surfaces of the guide vane respectively.

[0009] Further, the inner circle table frame comprises a rocker arm, a first end of the rocker arm is hinged to the rotating through hole, and a second end of the rocker arm is provided with a gauge mounting seat used for installing a measuring gauge.

[0010] Further, a plurality of limiting holes are spaced apart in the vertical direction on the gauge mounting seat, and the limiting holes are used for installing the outer circle table frame.

[0011] Further, the outer circle table frame comprises a mounting shaft, a first end of the mounting shaft is used for installing a measuring gauge, a second end of the mounting shaft is provided with a rolling element abutting against the mounting plate and used for rolling along the mounting plate, and the second end of the mounting shaft is used for detachable connection with any one of the limiting holes on the gauge mounting seat of the rocker arm.

[0012] Further, the rolling element is in a cylindrical shape, a limiting slot hole is formed on the mounting plate, the limiting slot hole is located on a side of the rotating through hole facing the six-point positioning assembly, a side wall of the limiting slot hole away from the rotating through hole is in a circular arc surface and coaxially arranged relative to the rotating through hole, and the rolling element is used for rolling in abutment with the circular arc surface of the limiting slot hole.

[0013] Further, the mounting plate is further provided with a pair of gauges, the pair of gauges comprises two supports fixedly arranged on the mounting plate, and a pair of gauge blocks are arranged on the two supports respectively, the pair of gauge blocks on the two supports are arranged corresponding to the standard sizes of the inner and outer annular surfaces of the guide vane respectively, and the pair of gauge blocks are used for calibrating and zeroing the measuring gauges.

[0014] Further, the A2 positioning pin comprises an A2 point pin in a ball head structure, an installation seat is arranged on the mounting plate, an installation block is installed on the installation seat through a diamond-shaped pin limiting, the installation block and the installation seat are fastened through an oblong head screw, and the A2 point pin is fixedly installed on the installation block.

[0015] Further, the top of the B5 positioning block and the B4 positioning block is in a sharp corner structure, the B5 positioning block and the B4 positioning block are fixedly arranged on the mounting plate, the C6 positioning pin is in a cylindrical pin structure, the C6 positioning pin is installed on the top of the B4 positioning block, and the axis of the C6 positioning pin is perpendicular to the mounting plate.

[0016] Further, the A3 positioning pin comprises an A3 point pin, the A1 positioning pin comprises an A1 point pin, the A3 point pin and the A1 point pin are both in a ball head structure, the A3 point pin and the A1 point pin are installed on the mounting plate through an A3 positioning block and an A1 positioning block respectively, and the A3 point pin and the A1 point pin have a height difference.

[0017] In addition, the application also discloses a blade inner and outer diameter measuring method, and the method comprises the following steps:

[0018] S100, fixing the guide vane,

[0019] S101, moving away the inner circle table frame and the outer circle table frame, and disassembling the A2 point pin,

[0020] S102, placing the inlet edge of the guide vane on the B4 positioning block and the B5 positioning block, and making the back of the guide vane close to the side of the C6 positioning pin, and meanwhile, making the inner flow channel surface of the guide vane close to the A3 point pin and the A1 point pin,

[0021] S103, installing the A2 point pin and making the A2 point pin close to the inner flow channel surface of the guide vane,

[0022] S200, measuring the inner and outer diameters of the guide vane,

[0023] S201, adjusting the measuring tool on the inner circle table frame to zero, then swinging the inner circle table frame to measure the inner annular surface of the guide vane through the measuring tool and recording the point value,

[0024] S202, adjusting the measuring tool on the outer circle table frame to zero, then swinging the outer circle table frame to measure the outer annular surface of the guide vane through the measuring tool and recording the point value, or installing the outer circle table frame on the tool mounting seat of the inner circle table frame, so that the outer circle table frame can be swung to measure the outer annular surface of the guide vane.

[0025] The application has the following beneficial effects:

[0026] The application is used for stably fixing the special-shaped guide vane and avoiding the interference of the clamping positioning point with the detection tool, i.e., avoiding the detection of the annular surface, by arranging six-point positioning components on the mounting plate, wherein the A2 positioning pin, the A3 positioning pin and the A1 positioning pin are used for supporting the inner flow channel surface of the guide vane, the B5 positioning block and the B4 positioning block are used for supporting the inlet edge of the guide vane from the bottom, the C6 positioning pin is used for supporting the back of the guide vane, and the A2 positioning pin is designed to be detachable, so as to realize the locking positioning and disassembly of the guide vane, thereby realizing the multi-directional stable locking positioning of the guide vane according to the structural characteristics of the guide vane, and avoiding the interference with the detection of the inner annular surface and the outer annular surface of the guide vane.

[0027] The present application solves the problem of measuring the inner and outer annular surfaces of the guide vane by setting a rotating through hole on the mounting plate, installing the measuring tool by using the inner and outer circular table frames, swinging the inner and outer circular table frames around the rotating through hole to drive the measuring tool to measure the inner and outer annular surfaces of the vane, and simultaneously, the inner and outer circular table frames can measure the point value of the annular surface of the vane to realize rechecking and checking without using additional three-coordinate measuring tools to measure the point value; and in order to ensure the unity of the detection positioning reference and the machining positioning reference, the rotating through hole on the mounting plate is set to be consistent with the rotating center of the vane, and since the rotating center of the vane is coincident with the shaft center of the engine, the consistency of the detection reference and the machining positioning reference is ensured, the machining reference of the detection value is ensured, and the machining precision is ensured.

[0028] Of course, any product implementing the present application does not necessarily need to achieve all the advantages mentioned above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate preferred embodiments of the application, and assist in the explanation of the application. In the drawings:

[0030] Figure 1 is a schematic view of the overall structure of the preferred embodiment of the present application;

[0031] Figure 2 is a schematic view of the front view of the preferred embodiment of the present application.

[0032] Figure 3 is a schematic view of the G-G sectional view of the preferred embodiment of the present application.

[0033] Figure 4 is a schematic view of the installation of the diamond pin of the preferred embodiment of the present application.

[0034] Figure 5 is a schematic view of the clamped guide vane of the preferred embodiment of the present application.

[0035] Figure 6 is a schematic view of the position of the six-point positioning on the measuring device of the preferred embodiment of the present application.

[0036] Figure 7 is a schematic view of the structure of the six-point positioning assembly of the preferred embodiment of the present application.

[0037] Figure 8 is a schematic view of the detachable installation structure of the A2 point pin of the preferred embodiment of the present application.

[0038] Legend: 1, mounting plate; 2, oblong head screw; 3, mounting seat; 4, mounting block; 5, A2 point pin; 6, B5 positioning block; 7, first high head screw; 8, outer circle table frame; 9, rotary through hole; 10, A3 positioning block; 11, second high head screw; 12, A3 point pin; 13, B4 positioning block; 14, C6 positioning pin; 15, stop pin; 16, support; 17, table block; 18, inner circle table frame; 19, compression screw; 20, clamping screw; 21, A1 mounting block; 22, welding handle; 23, guide sleeve; 24, diamond pin; 25, mandrel; 26, needle roller bearing; 27, inner hexagonal screw; 28, rocker arm; 29, clamp sleeve; 30, table block; 31, rolling piece; 32, mounting sleeve; 33, mounting shaft; 34, limiting slot hole. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0040] The blade inner and outer diameter measuring device is used for measuring the radius of the inner and outer annular surfaces of the guide vane of an aero-engine, comprising:

[0041] A mounting plate 1, wherein a rotary through hole 9 is formed on the mounting plate 1, and the rotary through hole 9 is located at the rotation center of the guide vane;

[0042] A six-point positioning assembly is fixed on the mounting plate 1 and used for fixing the guide vane, wherein the six-point positioning assembly comprises an A2 positioning pin, a B5 positioning block 6, an A3 positioning pin, an A1 positioning pin, a B4 positioning block 13 and a C6 positioning pin 14 arranged in a ring shape in the clockwise direction along the rotary through hole 9, wherein the A2 positioning pin, the A3 positioning pin and the A1 positioning pin are used for supporting the inner flow passage surface of the guide vane, the A2 positioning pin is detachably mounted on the mounting plate 1, the B5 positioning block 6 and the B4 positioning block 13 are used for supporting the inlet edge of the guide vane from the bottom, and the C6 positioning pin 14 is used for supporting the back of the guide vane;

[0043] An inner circle table frame 18 and an outer circle table frame 8, wherein the inner circle table frame 18 and the outer circle table frame 8 are both used for mounting measuring instruments, and the inner circle table frame 18 and the outer circle table frame 8 are both mounted on the rotary through hole 9 and used for swinging relative to the rotary through hole 9, thereby driving the measuring instruments to move along the inner and outer annular surfaces of the guide vane, respectively.

[0044] It can be understood that the mounting plate 1 is used as a supporting bottom plate, a rotating through hole 9 is formed in the mounting plate 1 and is consistent with the rotating center position of the guide vane, and the unification of the detection positioning reference and the machining positioning reference is realized by using the characteristic that the vane rotating center is coincident with the engine shaft center. After the guide vane is stably positioned by using the six-point positioning assembly, the inner circle table frame 18 and the outer circle table frame 8 are installed, the measuring gauge is installed according to the requirement, the rolling measuring gauge or the measuring point value measuring gauge such as a dial gauge is installed, and the inner circle table frame 18 and the outer circle table frame 8 are swung around the rotating through hole 9, so that the inner ring surface and the outer ring surface of the guide vane are measured.

[0045] Preferably, referring to Figure 1 , 2 , 5, 6, the inner circle table frame 18 comprises a rocker arm 28, a first end of the rocker arm 28 is hinged to the rotating through hole 9, and a second end of the rocker arm 28 is provided with a gauge mounting seat for installing the measuring gauge.

[0046] It should be noted that, in order to prevent the rocker arm 28 from swinging up and down during rotation around the rotating through hole 9, a core shaft 25 at one end of the rocker arm 28 is assembled with the rotating through hole 9 in interference fit through a needle bearing 26, and the axial gap between the rocker arm 28 and the core shaft 25 is controlled to be less than 0.01 mm.

[0047] Preferably, referring to Figure 1 , 2 , 3, 5, 6, a plurality of limiting holes are formed in the gauge mounting seat in the vertical direction and are spaced apart, and the limiting holes are used for installing the outer circle table frame 8.

[0048] It should be noted that the outer circle table frame 8 can be installed through the inner circle table frame 18 or can be used independently. A clamping sleeve 29 can be arranged in the limiting hole, a screw hole is formed beside the limiting hole, the clamping sleeve 29 is pressed tightly by arranging a pressing screw 19 in the screw hole, so that the installation shaft 33 of the outer circle table frame 8 is clamped.

[0049] Preferably, referring to Figure 1 , 2, 5, 6, the outer circle table frame 8 includes a mounting shaft 33, the first end of the mounting shaft 33 is used for installing the measuring instrument, the second end of the mounting shaft 33 is provided with a rolling piece 31 which is supported on the mounting plate 1 and is used for rolling along the mounting plate 1, and the second end of the mounting shaft 33 is used for detachable connection with any one limiting hole on the measuring instrument mounting seat of the rocker arm 28. The rolling piece 31 is cylindrical, and a limiting slot hole 34 is formed in the mounting plate 1, the limiting slot hole 34 is located on the side of the rotary through hole 9 facing the six-point positioning assembly, and the side wall of the limiting slot hole 34 away from the rotary through hole 9 is a circular arc surface coaxial with the rotary through hole 9, and the rolling piece 31 is used for rolling in close contact with the circular arc surface of the limiting slot hole 34.

[0050] It should be noted that when the outer circle table frame 8 is used independently, the rolling piece 31 can cooperate with the circular arc surface of the limiting slot hole 34 to limit the position, and the circular arc surface of the limiting slot hole 34 is concentric with the rotary through hole 9, so that the measurement reference remains unchanged, and the outer circle table frame 8 can be conveniently held for point value measurement, and the key size of the outer ring surface can be rechecked without using additional three-coordinate measuring instruments for point value rechecking, thereby expanding the use scenarios and functions of the outer circle table frame 8.

[0051] Preferably, please refer to Figure 1 , 3 , 5, the mounting plate 1 is further provided with a pair of measuring blocks 17, the two supporting seats 16 are provided with a pair of measuring blocks 17, and the two supporting seats 16 are provided with a pair of measuring blocks 17 corresponding to the standard size of the inner ring surface and the outer ring surface of the guide blade, respectively. The pair of measuring blocks 17 are used for calibrating and zeroing the measuring instrument.

[0052] It should be noted that the pair of measuring blocks 30 are fixedly arranged on the mounting plate 1, and the pair of measuring surfaces of the pair of measuring blocks 30 are arc surfaces, the center of the arc surfaces coincides with the center of the rotary through hole 9, the pair of measuring blocks 30 can conveniently calibrate and zero the measuring instrument before measurement, and the measurement reference and the swing axis of the measurement tool are always consistent, thereby avoiding systematic errors caused by the inconsistency between the measuring instrument and the measurement tool when the measuring instrument is used independently for zeroing.

[0053] Preferably, please refer to Figure 1 , 5 , 7, 8, the A2 positioning pin includes an A2 point pin 5, and the A2 point pin 5 is a ball head structure; the mounting plate 1 is provided with a mounting seat 3, the mounting seat 3 is provided with a mounting block 4 through a diamond-shaped pin 24, and the mounting block 4 and the mounting seat 3 are fastened through a rectangular head screw 2; and the A2 point pin 5 is fixedly installed on the mounting block 4.

[0054] Need to explain, when the back of the leaf is limited by C6 positioning pin 14, the first A2 positioning pin plays the final locking function, so the A2 positioning pin adopts a detachable structure. In order to accurately control the position size of the A2 point pin 5, the mounting block 4 and the mounting seat 3 are in a gapless sliding fit, and are limited by the diamond pin 24. When the blade is installed, loosen the oblong head screw 2, take out the mounting block 4, install the blade, and then install the mounting block 4 and tighten the oblong head screw 2.

[0055] Preferably, please refer to Figure 1 、 7 The top of the B5 positioning block 6 and the B4 positioning block 13 is a sharp corner structure, the B5 positioning block 6 and the B4 positioning block 13 are fixedly arranged on the mounting plate 1, the C6 positioning pin 14 is a cylindrical pin structure, the C6 positioning pin 14 is arranged on the top of the B4 positioning block 13, and the axis of the C6 positioning pin 14 is perpendicular to the mounting plate 1. The A3 positioning pin includes an A3 point pin 12, the A1 positioning pin includes an A1 point pin, the A3 point pin 12 and the A1 point pin are both ball head structures, the A3 point pin 12 and the A1 point pin are arranged on the mounting plate 1 through an A3 positioning block 10 and an A1 positioning block respectively, and the A3 point pin 12 and the A1 point pin have a height difference.

[0056] Need to explain, since the guide vane is only detected in the blank warehouse, the six reference points on the non-machining surface are detected as the positioning reference for the machining sequence. The top of the B5 positioning block 6 and the B4 positioning block 13 is a sharp corner structure, which can improve the contact pressure between the vane and the inlet edge and improve the clamping stability. Therefore, the six-point positioning assembly adopts high-hardness wear-resistant materials and needs to be heat treated.

[0057] In addition, the present application also discloses a vane inner and outer diameter measuring method, which adopts the above measuring device and includes the following steps:

[0058] S100, fix the guide vane:

[0059] S101, remove the inner circle table rack 18 and the outer circle table rack 8, loosen the oblong head screw 2, take out the mounting block 4, and disassemble the A2 point pin 5;

[0060] S102, place the inlet edge of the guide vane on the B4 positioning block 13 and the B5 positioning block 6, and make the back of the guide vane close to the side of the C6 positioning pin 14, and at the same time, make the inner flow passage surface of the guide vane fit the A3 point pin 12 and the A1 point pin;

[0061] S103, install the mounting block 4 to make the A2 point pin 5 close to the inner flow passage surface of the guide vane, and tighten the oblong head screw 2;

[0062] S200, measure the inner and outer diameters of the guide vane;

[0063] S201, align the measuring tool on the inner circle table frame 18 with the counter table piece 30 on the mounting plate 1 to perform zero setting, then swing the rocker arm 28 to measure the inner surface of the guide vane and record the point value;

[0064] S202, align the measuring tool on the outer circle table frame 8 with the counter table piece 30 on the mounting plate 1 to perform zero setting, then hold the outer circle table frame 8 to make the rolling piece 31 contact with the arc surface of the limiting slot hole 34 on the mounting plate 1 and keep rolling contact, measure the outer surface of the guide vane through the measuring tool and record the point value; or install the outer circle table frame 8 on the tool mounting seat of the inner circle table frame 18, then swing the outer circle table frame 8 through the rocker arm 28 to measure the outer surface of the guide vane.

[0065] The detection method of the present application realizes stable positioning of the guide vane through the six-point positioning assembly, wherein the installation and disassembly of the vane can be completed only by disassembling and assembling the A2 point pin 5, the inner and outer surfaces of the vane can be measured through the inner circle table frame 18 and the outer circle table frame 8 after the vane is fixed, the operation is very convenient and efficient, the outer circle table frame 8 can be used in cooperation with the rocker arm 28 or can be used alone for point value measurement and re-inspection, the function expansion is strong, no additional measuring tools are needed, which is helpful to reduce the cost.

[0066] It should be noted that in this text, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive containing, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0067] The principles and embodiments of the present application are described in this text, and the above description of the examples is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific embodiments and application scope will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A blade inner and outer diameter measuring device for measuring the radii of the inner and outer annular surfaces of a guide vane of an aeroengine, characterised in that, The utility model relates to a kind of six-point positioning and measurement device for guide vane, including: Mounting plate (1), the rotary through-hole (9) is located in the rotary center of the guide vane is opened in the mounting plate (1),; Six-point positioning assembly, the six-point positioning assembly is fixed on the mounting plate (1) and is used to fix the guide vane, the six-point positioning assembly includes A2 positioning pin, B5 locating block (6), A3 positioning pin, A1 positioning pin, B4 locating block (13) and C6 positioning pin (14) that B5 locating block (6), A3 positioning pin, A1 positioning pin, B4 locating block (13) and C6 positioning pin (14) are sequentially arranged in annular along the clockwise direction of the rotary through-hole (9), A2 positioning pin, A3 positioning pin and A1 positioning pin are used to support the inside flow channel surface of the guide vane, wherein A2 positioning pin is detachably mounted on the mounting plate (1), B5 locating block (6) and B4 locating block (13) are used to support the air inlet edge of the guide vane from bottom, C6 positioning pin (14) is used to support the back of the guide vane blade; Inner circle table frame (18) and outer circle table frame (8), the inner circle table frame (18) and the outer circle table frame (8) are used to install measuring gauge, the inner circle table frame (18) and the outer circle table frame (8) are installed on the rotary through-hole (9) and are used to swing relative to the rotary through-hole (9), to drive the measuring gauge moves and measures along the inner ring surface and the outer ring surface of the guide vane respectively;The inner circle table frame (18) includes rocker arm (28), the first end of the rocker arm (28) is hinged on the rotary through-hole (9), and the second end of the rocker arm (28) is provided with gauge mounting seat, and the gauge mounting seat is used to install measuring gauge;The mounting plate (1) is further provided with counter gauge (30), and the counter gauge (30) includes two supports (16) fixed to the mounting plate (1), and the counter block (17) is provided on the two supports (16), and the counter block (17) on the two supports (16) is correspondingly arranged according to the standard size of the inner ring surface and the outer ring surface of the guide vane, and the counter block (17) is used to calibrate and zero the measuring gauge;A2 positioning pin includes A2 point pin (5), and the A2 point pin (5) is a ball head structure;The mounting plate (1) is provided with mounting seat (3), the mounting block (4) is limitingly installed on the mounting seat (3) by diamond pin (24), and the mounting block (4) and mounting seat (3) are fastened by oblong head screw (2);The A2 point pin (5) is fixedly installed on the mounting block (4).

2. The blade inside and outside diameter measuring device of claim 1, wherein, A plurality of limiting holes are spaced apart in the vertical direction on the gauge mounting seat, and the limiting holes are used to install the outer circle table frame (8).

3. The blade inside and outside diameter measuring device of claim 2, wherein, The outer circle table frame (8) includes mounting shaft (33), the first end of the mounting shaft (33) is used to install measuring gauge, the second end of the mounting shaft (33) is provided with rolling element (31) that leans on the mounting plate (1) and is used to roll along the mounting plate (1), and the second end of the mounting shaft (33) is further used to be detachably connected with any one limiting hole on the gauge mounting seat of the rocker arm (28).

4. The blade inside and outside diameter measuring device of claim 3, wherein, The rolling member (31) is cylindrical, a limiting slot hole (34) is formed on the mounting plate (1), the limiting slot hole (34) is located on the side of the rotating through hole (9) facing the six-point positioning assembly, the side wall of the limiting slot hole (34) away from the rotating through hole (9) is a circular arc surface coaxially arranged relative to the rotating through hole (9), and the rolling member (31) is used for rolling with the circular arc surface of the limiting slot hole (34).

5. The blade inside and outside diameter measuring device of claim 1, wherein, The top of the B5 positioning block (6) and the B4 positioning block (13) is a sharp corner structure, the B5 positioning block (6) and the B4 positioning block (13) are fixedly arranged on the mounting plate (1), the C6 positioning pin (14) is a cylindrical pin structure, the C6 positioning pin (14) is installed on the top of the B4 positioning block (13), and the axis of the C6 positioning pin (14) is perpendicular to the mounting plate (1).

6. The blade inside and outside diameter measuring device of claim 1, wherein, The A3 positioning pin includes an A3 point pin (12), the A1 positioning pin includes an A1 point pin, the A3 point pin (12) and the A1 point pin are both ball head structures, the A3 point pin (12) and the A1 point pin are respectively installed on the mounting plate (1) through an A3 positioning block (10) and an A1 positioning block, and there is a height difference between the A3 point pin (12) and the A1 point pin.

7. A method of measuring the inner and outer diameter of a blade using the blade inner and outer diameter measuring device according to any one of claims 1 to 6, characterized by, The method comprises the following steps: S100, fixing the guide vane: S101, moving away the inner circle table frame (18) and the outer circle table frame (8), and disassembling the A2 point pin (5); S102, placing the inlet edge of the guide vane on the B4 positioning block (13) and the B5 positioning block (6), and making the back of the guide vane close to the side of the C6 positioning pin (14), and at the same time, making the inner flow channel surface of the guide vane close to the A3 point pin (12) and the A1 point pin; S103, installing the A2 point pin (5) and making the A2 point pin (5) close to the inner flow channel surface of the guide vane; S200, measuring the inner and outer diameters of the guide vane: S201, adjusting the measuring tool on the inner circle table frame (18) to zero, then swinging the inner circle table frame (18) to measure the inner ring surface of the guide vane through the measuring tool and recording the point value; S202, adjusting the measuring tool on the outer circle table frame (8) to zero, then swinging the outer circle table frame (8) to measure the outer ring surface of the guide vane through the measuring tool and recording the point value; or installing the outer circle table frame (8) on the tool mounting seat of the inner circle table frame (18), so that the outer circle table frame (8) is swung to measure the outer ring surface of the guide vane.

Images