Gas compressor blade body feature point detection device and detection method

Abstract

The invention discloses a gas compressor blade body feature point detection device and method in the technical field of gas compressor blade measurement, and the device comprises a body, the surface of the body is fixedly provided with a positioning and pressing mechanism and a plurality of measurement mechanisms, and the measurement mechanisms are movably provided with measurement meter mechanisms. The positioning and pressing mechanism fixes the compressor blade in a pressing mode, and the multiple measuring mechanisms are located on the blade basin side and the air inlet edge side of the compressor blade correspondingly to measure the blade body feature points and the position size of the blade air inlet side. And the measuring meter mechanism reads a blade body feature point and a blade air inlet side position size deviation value based on a measuring result of the measuring mechanism. According to the invention, the detection problem of the compressor blade processing site is solved, the detection device is novel in structure and reliable in positioning, the detection requirements of a plurality of spatial feature points of the compressor blade body can be rapidly realized, the detection efficiency is high, and the blade measurement efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to a device and method for detecting characteristic points on the blade body of a compressor blade, belonging to the technical field of compressor blade measurement. Background Art

[0002] A compressor is a component in a gas turbine engine that uses high-speed rotating blades to do work on air to increase air pressure. The front part of the impeller blade of a compressor is curved and called a guide wheel, whose function is to introduce gas into the working impeller without impact and reduce the airflow impact loss. The impeller of a small supercharger generally integrates the guide wheel and the working impeller. There is a diffuser at the outlet of the compressor impeller to convert as much of the kinetic energy obtained by the gas in the impeller into pressure as possible.

[0003] The inspection of characteristic points on the blade body of a compressor blade usually adopts coordinate measuring or optical measuring. Due to the large number of blades and insufficient coordinate measuring resources at the production site, it is impossible to meet the needs of actual production site detection. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a device and method for detecting characteristic points on the blade body of a compressor blade, which has a novel structure, is convenient to operate, has high detection efficiency, and can meet the requirements of on-line detection of characteristic points on the blade body of a compressor blade.

[0005] To achieve the above purpose, the present invention is implemented by the following technical solutions:

[0006] In the first aspect, the present invention provides a device for detecting characteristic points on the blade body of a compressor blade, including a main body. A positioning and clamping mechanism and a plurality of measuring mechanisms are fixedly installed on the surface of the main body. A measuring gauge mechanism is movably assembled at the measuring mechanism. The positioning and clamping mechanism fixes the compressor blade by clamping. The plurality of measuring mechanisms are respectively located on the suction side and the leading edge side of the compressor blade to measure the characteristic points on the blade body and the position dimensions on the air inlet side of the blade. The measuring gauge mechanism reads the deviation values of the characteristic points on the blade body and the position dimensions on the air inlet side of the blade based on the measurement results of the measuring mechanism.

[0007] Further, the positioning and clamping mechanism includes a support plate fixedly installed on the surface of the main body. A side positioning block and a plurality of pressure surface positioning blocks are fixedly installed on the surface of the support plate. Corresponding through holes are provided in the main body and the support plate, and a compression pin passes through the through holes. The bottom surface of the main body is installed with a lever through a support pin. A compression screw is threadedly screwed through the surface of the main body. One end of the lever is pin-connected to the compression pin and the other end abuts against the bottom of the compression screw.

[0008] Further, a compression spring is sleeved on the outer wall of the compression pin located below the main body, and the lever is elastically abutted against the bottom of the compression screw under the elastic force of the compression spring.

[0009] Further, one end of the pressing pin located on the surface of the support plate is V-shaped, and one end located at the bottom of the body is provided with a U-shaped groove for pin-connecting with the lever.

[0010] Further, the measuring mechanism includes two linear guide rails installed on the surface of the body. The two linear guide rails are respectively oriented towards the suction side and the leading edge side of the compressor blade, and measuring support blocks are slidably connected to the guide rails. A plurality of guiding holes are formed in the side wall of the measuring support block, and movable measuring pins with different lengths are slidably fitted in each guiding hole. A spring is sleeved on the outer wall of the movable measuring pin, and a shaft retaining ring is arranged at the tail end. A dial indicator alignment pin is press-fitted in the hole on the surface of the measuring support block.

[0011] Further, mounting holes are formed in the surface of the support plate, and limit pins are press-fitted in the holes.

[0012] Further, the dial indicator alignment pin is a stepped shaft, wherein the small end of the stepped shaft is press-fitted with the hole on the surface of the measuring support block, and the large end face is used for alignment.

[0013] Further, a support is mounted on the surface of the body, and a hinge presser for fixing the sliding position of the fixed measuring support block is mounted on the side of the support.

[0014] Further, the measuring instrument mechanism includes a high measuring frame for measuring the characteristic points of the blade tip section of the blade and a low measuring frame for measuring the characteristic points of the blade root section of the blade, and dial indicators are mounted on both the high measuring frame and the low measuring frame through bolts.

[0015] In a second aspect, the present invention provides a detecting device for the characteristic points of the compressor blade airfoil. Based on the above-mentioned detecting device for the characteristic points of the compressor blade airfoil, it includes:

[0016] Pressing and fixing the compressor blade through the positioning and pressing mechanism;

[0017] Measuring the airfoil characteristic points and the position dimensions of the air intake side of the blade through the measuring mechanism located on the suction side and the leading edge side of the compressor blade;

[0018] Based on the measurement results of the measuring mechanism, reading the deviation values of the airfoil characteristic points and the position dimensions of the air intake side of the blade through the measuring instrument mechanism.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0020] First, this solution solves the detection problem on the processing site of the compressor blade. The detection device has a novel structure, reliable positioning, can quickly meet the detection requirements of multiple spatial characteristic points of the compressor blade airfoil, has high detection efficiency, greatly improves the blade measurement efficiency, and improves the detection accuracy of the special-shaped curved surface profile, especially suitable for capturing the shape and position characteristics in the gradually changing curvature regions such as the leading edge and trailing edge of the compressor blade.

[0021] 2. The pressing pin integrates the lever mechanics amplification principle and the multi-degree-of-freedom constraint mechanism to form a passive self-aligning clamping system. When the blade contacts the positioning block, the pressing pin automatically compensates for the assembly clearance under the action of the spring preload, and forms a stable statically determinate constraint through three-point contact, eliminating the stress deformation caused by over-positioning of the traditional rigid fixture. While ensuring the repeat positioning accuracy, it realizes micron-level self-adaptive clamping;

[0022] 3. The measuring support block and the movable measuring pin adopt a quick-change interface design, and cooperate with the elastic limit mechanism of the shaft retaining ring. The detection array can be quickly reconstructed according to different blade profile characteristics. The multi-travel configuration scheme of the linear guide rail supports the flexible expansion of the detection station. By adjusting the length and layout density of the measuring pins, it can be compatible with the detection requirements of different types of compressor blades, significantly reducing the time cost of production line changeover;

[0023] 4. The double-station operation mode of the integrated hinge press realizes the timing optimization of the detection process. The coordinated action of the measuring support block retraction mechanism and the pressing lever forms an anti-misoperation locking mechanism. The operator can complete the detection of the double-sided characteristics of the blade basin and the blade back through a single clamping. Combined with the table frame sliding type reading scheme, the traditional detection process is simplified into a direct operation of "clamping - reading", significantly reducing the technical dependence on the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments and descriptions thereof of the invention are used to explain the invention and do not constitute an improper limitation to the invention. In the drawings:

[0025] Figure 1 is an axonometric view of a compressor blade airfoil feature point detection device provided by Embodiment 1 of the present invention;

[0026] Figure 2 is a front view of a compressor blade airfoil feature point detection device provided by Embodiment 1 of the present invention;

[0027] Figure 3 is a top view of a compressor blade airfoil feature point detection device provided by Embodiment 1 of the present invention;

[0028] Figure 4 is a left view of a compressor blade airfoil feature point detection device provided by Embodiment 1 of the present invention;

[0029] Figure 5 is an axonometric view of the pressure surface positioning block of a compressor blade airfoil feature point detection device provided by Embodiment 1 of the present invention;

[0030] Figure 6The front view of the pressing pin of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0031] Figure 7 The schematic diagram of the measuring mechanism of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0032] Figure 8 The schematic diagram of the movable measuring pin of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0033] Figure 9 The schematic diagram of the alignment pin of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0034] Figure 10 The schematic diagram of the special dial gauge stand part of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0035] Figure 11 The schematic diagram of the structural model of the positioning and pressing mechanism of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0036] Figure 12 The schematic diagram of the structural model of the measuring mechanism and the dial gauge stand part of a compressor blade airfoil feature point detection device provided in Embodiment 1 of the present invention;

[0037] In the figure: 1, body; 2, support plate; 3, pressure surface positioning block; 4, side positioning block; 5, pressing pin; 6, supporting pin; 7, lever; 8, pressing screw; 9, movable measuring pin; 10, measuring support block; 11, linear guide rail; 12, alignment pin; 13, spring; 14, shaft retaining ring; 15, limit pin; 16, hinge press; 17, support; 18, high dial gauge stand; 19, low dial gauge stand; 20, bolt; 21, dial indicator. Detailed implementation manners

[0038] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. The terms used in the present invention are only for the purpose of describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention.

[0040] Embodiment 1:

[0041] This embodiment discloses a detection device for the characteristic points of the compressor blade body for comparative measurement. The detection device mainly includes three parts: a positioning and clamping mechanism, a measuring mechanism, and a measuring instrument mechanism. Among them, the measuring mechanism is the core of the entire detection device. The positioning and clamping mechanism and the measuring mechanism are installed on the main body 1, and the measuring instrument mechanism is a movable part. As Figure 1 shown, the positioning and clamping mechanism consists of a support plate 2, a pressure surface positioning block 3, a side positioning block 4, a pressing pin 5, a supporting pin 6, a lever 7, a pressing screw 8, and a screw cylindrical pin. The support plate 2 is installed on the upper surface of the main body 1 through screws and cylindrical pins. The two pressure surface positioning blocks 3 and the side positioning block 4 are installed on the upper surface of the support plate 2 through screws and cylindrical pins. One end of the V-shaped surface of the pressing pin 5 is used to press the blade, and the outer circle is in sliding fit with the hole of the support plate 2, passing through the relief hole of the main body 1. The other end of the U-shaped groove is connected to the lever 7 through a cylindrical pin. The supporting pin 6 is used to support the lever 7 to ensure flexible rotation of the lever. One end of the shaft is in interference fit with the middle hole of the main body 1 and is connected with screws and cylindrical pins. The pressing screw 8 is threadedly engaged with the main body 1. By rotating the pressing screw 8, the pressing pin 5 is driven up and down by the lever to realize the loosening and pressing of the blade.

[0042] The measuring mechanism consists of a movable measuring pin 9, measuring support blocks 10 (one for the blade concave side and one for the inlet edge), a linear guide rail 11, an alignment pin 12, a spring 13, a shaft retaining ring 14, a limit pin 15, a hinge clamp 16, a support 17, etc. The measuring support blocks 10 are installed on the upper surface of the movable block of the linear guide rail 11 through screws and cylindrical pins. The linear guide rail 11 is installed on the upper surface of the main body 1 through screws and cylindrical pins. The measuring support blocks 10 reciprocate along the linear guide rail 11 in the measuring direction, facilitating the loading and unloading of the measured blade and realizing the measurement of the characteristic points of the blade body. The movable measuring pins 9 with different lengths are respectively in sliding fit with the guiding holes of the measuring support blocks 10 and are limited by the shaft retaining ring 14. Under the elastic force of the spring 13, it is ensured that the movable measuring pins 9 are in contact with the measured blade. The number of movable measuring pins 9 corresponds to the number and position of the measured characteristic points. The limit pin 15 is in interference fit in the hole of the support plate 2, and the alignment pin 12 is in interference fit in the hole of the measuring support block 10. The alignment pin 12 is a stepped shaft. The small end is in interference fit with the middle hole of the measuring support block 10, and the large end face is used for alignment. There are two corresponding to the high and low measuring frames. The hinge clamp 16 is installed on the side of the support 17 through screws, and the support 17 is installed on the upper surface of the main body 1 through screws.

[0043] The measuring instrument mechanism part consists of a high measuring frame 18, a low measuring frame 19, a bolt 20, and a dial indicator (indicating device) 21. The high measuring frame 18 is used to measure the characteristic points of the blade tip section, and the low measuring frame 19 is used to measure the characteristic points of the blade root section. The bolt 20 is used to fix the dial indicator 21.

[0044] According to the requirements of the process specification, for the positioning and pressing mechanism, the two pressure surface positioning blocks 3 are in contact with the two arc pressure surfaces of the blade tenon head for positioning, and the side positioning block 4 is in contact with the end face of the tenon head on the back side of the blade for supporting and positioning. The end of the pressing pin 5 is provided with a V-shaped pressing surface, which forms a V-shaped centering press with the two-degree surface of the tenon head bottom surface, improving the repeated positioning accuracy of the blade. For the convenience of operation, the pressing direction is converted to the upper part of the body 1 through the lever 6 installed in the support pin 7, and the blade is pressed with the pressing screw 8.

[0045] The measuring mechanism is the core of the entire detection device. Adopting the relative measurement principle, multiple spatial measurement feature points on the complex profile of the blade body are transferred and led out to the end face according to their theoretical positions through the movable measuring pins 9 with different lengths, and are flush with the end face of the step alignment pin 12 fixed on the measuring support block 10, ensuring that the flatness is 0.005 - 0.01 mm. At this time, the design state is the theoretical dimension. When the measured feature points of the blade deviate from the theoretical position, the movable measuring pin 9 expands and contracts along the axial direction accordingly, and there is a deviation from the alignment end face of the alignment pin 12. This deviation value is measured and read through the dial indicator in the dial gauge rack, thereby realizing the relative measurement of the feature points on the complex profile.

[0046] The head of the movable measuring pin 9 on the blade body is spherical, and the center position of the ball head needs to be corrected. It is designed according to the spatial normal direction of the blade profile where the measuring feature points of the blade body are located. The movable measuring pin 9 is installed in the corresponding hole of the measuring support block 10 and is in sliding fit with the hole, and the fit clearance is not greater than 0.01 mm. The movable measuring pin 9 is provided with an annular groove on the outer cylindrical surface near the end, and the shaft retaining ring 14 is installed to play the role of axial limit. There is a step surface near the measurement for supporting the spring 13, so that each movable measuring pin 9 is in contact measurement state with the measured blade under the action of the spring force. The small end shaft diameter of the step alignment pin 12 is inserted into the side hole of the measuring support block 10 and is in interference fit firmly, and the large end face is used for alignment, and its length dimension is given artificially.

[0047] The upper surface and the side surface of the measuring support block 10 are kept perpendicular as reference surfaces for supporting the special dial gauge rack. The measuring support block 10 is fixed on the linear guide rail 11 with screws and cylindrical pins. The linear guide rail 11 is installed on the upper surface of the body 1. For the convenience of loading and unloading the blade and realizing measurement, the moving direction of the linear guide rail 11 is consistent with the measuring direction of the blade feature points. Relying on the reciprocating movement of the linear guide rail 11, the requirements of retraction and measurement are realized. The length of the sliding plate of the linear guide rail 11 is determined according to the operation space and the required stroke during blade measurement. The limit pin 15 is a stepped shaft, and the small cylindrical section is directly installed on the support plate 2 and is in interference fit. The large cylindrical section plays a limiting role. When the measuring support block 10 slides to be in close contact with the limit pin 15 on the side, the correct measurement position is ensured, and the measuring support block 10 is pressed with the hinge clamp 16, and then the measurement can be carried out.

[0048] The structure of the leading edge measuring mechanism of the blade is the same as that of the above-mentioned blade measuring structure, except that the head of the movable measuring pin is in the form of a knife edge.

[0049] The measuring instrument mechanism part clamps the dial indicator to realize the reading function. The high dial indicator stand 18 and the low dial indicator stand 19 are respectively used to measure the positions of the characteristic points of the upper and lower two cross-sections. The bottom surface and the side surface of the dial indicator stand are required to be perpendicular to each other, and they are supported on the vertical reference surface of the measuring support block 10. The holes on the dial indicator stand are used to install the reading indicating device (i.e., the dial indicator 21). Adjust and tighten the bolt 20 to firmly fix the dial indicator, ensuring the uniqueness of the position of the dial indicator during measurement.

[0050] During use, first loosen the two hinge compressors 16, and the two measuring support blocks 10 retreat along the linear guide 11 to the open state. Place the blade to be measured correctly in the detection device, ensure that the positioning surfaces of the detection device are in contact with the positioning surfaces of the blade tenon, tighten the compression screw 8, and through the lever 6 transfer, ensure that the blade is firmly clamped. Slide the measuring support block on the blade concave side and the leading edge measuring support block along the linear guide 10 respectively until they are in contact with their respective limit pins, and use the hinge compressor 16 to compress the measuring support block. The movable measuring pins on the measuring support block 10 contact the blade to be measured under the action of the spring force. Fit the mutually perpendicular reference surfaces of the high dial indicator base 18 and the low dial indicator base 19 with the reference surface of the measuring support block respectively. At this time, zero the dial indicator with the alignment pin on the measuring support block, and then slide the dial indicator stand along the reference surface of the measuring support block so that the dial indicator stand passes through the end face of each movable measuring pin 9, and sequentially read the telescopic amounts of each movable measuring pin through the dial indicator, so as to obtain the position dimension deviation values of the blade characteristic points and the blade intake side, and realize the measurement requirements of the positions of the blade characteristic points of the compressor blade.

[0051] In summary, this solution proposes a method and device for detecting the blade characteristic points of a compressor blade, which solves the detection problem on the processing site of the compressor blade. The detection device has a novel structure, reliable positioning, can quickly meet the detection requirements of multiple spatial characteristic points of the compressor blade, and has high detection efficiency. The detection device has been verified by on-site use, and the blade measurement efficiency has been greatly improved.

[0052] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all respects and are not the only ones. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific implementation manners of the present invention, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A detection device for characteristic points on the blade body of a compressor blade, characterized in that, It includes a main body (1), on the surface of which a positioning and pressing mechanism and a plurality of measuring mechanisms are fixedly installed. A measuring gauge mechanism is movably assembled at the measuring mechanism. The positioning and pressing mechanism fixes the compressor blade by pressing. The plurality of measuring mechanisms are respectively located on the suction side and the leading edge side of the compressor blade to measure the blade body feature points and the position dimensions of the blade intake side. The measuring gauge mechanism reads the deviation values of the blade body feature points and the position dimensions of the blade intake side based on the measurement results of the measuring mechanism.

2. The compressor blade airfoil characteristic point detection device according to claim 1, characterized in that, The positioning and pressing mechanism includes a support plate (2) fixedly installed on the surface of the main body (1). On the surface of the support plate (2), a side positioning block (4) and a plurality of pressure surface positioning blocks (3) are fixedly installed. The main body (1) and the support plate (2) are provided with corresponding through holes, and a pressing pin (5) passes through the through holes. The bottom surface of the main body (1) is installed with a lever (7) through a support pin (6). A pressing screw (8) is threadedly screwed through the surface of the main body (1). One end of the lever (7) is pin-connected to the pressing pin (5), and the other end abuts against the bottom of the pressing screw (8).

3. The compressor blade airfoil characteristic point detection device according to claim 2, characterized in that, A compression spring is sleeved on the outer wall of the pressing pin (5) located below the main body (1). The lever (7) is elastically abutted against the bottom of the pressing screw (8) under the action of the elastic force of the compression spring.

4. The compressor blade airfoil characteristic point detection device according to claim 2, characterized in that, One end of the pressing pin (5) located on the surface of the support plate (2) is V-shaped, and one end located at the bottom of the main body (1) is provided with a U-shaped groove for pin-connection with the lever (7).

5. The compressor blade airfoil characteristic point detection device according to claim 2, wherein The measuring mechanism includes two linear guide rails (11) installed on the surface of the main body (1). The two linear guide rails (11) respectively face the suction side and the leading edge side of the compressor blade, and measuring support blocks (10) are slidably connected to the guide rails. A plurality of guiding holes are provided on the side wall of the measuring support block (10), and movable measuring pins (9) with different lengths are slidably fitted in the respective guiding holes. A spring (13) is sleeved on the outer wall of the movable measuring pin (9), and a shaft retaining ring (14) is arranged at the tail end. A surface alignment pin (12) is press-fitted in the hole on the surface of the measuring support block (10).

6. The compressor blade airfoil characteristic point detection device according to claim 5, characterized in that, Installation holes are provided on the surface of the support plate (2), and limit pins (15) are press-fitted in the holes.

7. The compressor blade airfoil characteristic point detection device according to claim 5, characterized in that, The surface alignment pin (12) is a stepped shaft, in which the small end of the stepped shaft is press-fitted with the hole on the surface of the measuring support block (10), and the large end surface is used for alignment.

8. The compressor blade airfoil characteristic point detection device according to claim 5, characterized in that, A support (17) is installed on the surface of the main body (1), and a hinge compressor (16) for fixing the sliding position of the fixed measuring support block (10) is installed on the side of the support (17).

9. The compressor blade airfoil characteristic point detection device according to claim 1, characterized in that, The measuring gauge mechanism includes a high gauge frame (18) for measuring the feature points of the blade tip section and a low gauge frame (19) for measuring the feature points of the blade root section. A dial indicator (21) is installed on both the high gauge frame (18) and the low gauge frame (19) through bolts (20).

10. A method for detecting characteristic points on the blade body of a compressor blade, characterized in that, A device for detecting the feature points of the compressor blade body according to claim 1, comprising: Pressing and fixing the compressor blade through the positioning and pressing mechanism; Measuring the blade body feature points and the position dimensions of the blade intake side through the measuring mechanisms located on the suction side and the leading edge side of the compressor blade; Based on the measurement results of the measuring mechanism, the blade body feature points and the dimensional deviation value of the blade inlet side position are read through the measuring instrument mechanism.

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