CN101566458B - Special blade profile gap detector - Google Patents

Abstract

The invention provides a special blade profile gap detector which improves the prior digital-display detection instrument, can favorably suit the high-precision rapid high-efficiency detection requirements for detecting a small profile gap, replaces the prior manual three-coordinate measuring method and a general feeler detection mode and has the advantages of low production cost, high precision, rapid and flexible operation, small size, high detection efficiency and easy popularization. The special blade profile gap detector comprises a base, a displacement sensor and a guiding device, wherein the guiding device is fixed on the base and connected with the displacement sensor by a fixed block. The special blade profile gap detector is characterized by also comprising a conical feeler whichis connected with the guiding device by an L-shaped girder, and the contact head of the displacement sensor contacts with the positioning surface of the conical feeler.

Description

Special detector for blade surface clearance

(1) Technical field

The invention relates to steam turbine blade detection equipment, in particular to a special detector for blade profile clearance.

(2) Background technology

The surface of finished steam turbine blades and blade forgings has a small light transmission and a small gap, usually around 0.2-3mm, most of which are between 0.5-1.5mm. At present, there are two main ways to measure the blade profile size in my country. One is because the blade is a spatially distorted surface, and the finished blade profile is mostly measured by manual three-coordinate measurement. It is difficult to adjust the blade positioning, and the data is read more. The processing capacity is large and the efficiency is low. , the cost is high, and it is difficult to adapt to the production process requirements of multiple varieties of blades, small batches, serialization and quick detection. The second forging has many light-transmitting gaps on the surface, and it is obtained by using a special frame measuring tool and a special detection sample for a large envelope of the shape through a smooth feeler gauge to measure the sample and detect the gap between the workpiece (blade forgings). This measurement method has low accuracy and requires multiple The combined measurement of feeler gauges has a great influence on the measurement accuracy of the width of the feeler gauges. It is difficult to ensure that a blade usually has more than a dozen levels of cross-section profiles, and each level needs to detect gaps at multiple positions. The workload of surface detection is extremely heavy and the work intensity is high.

(3) Contents of the invention

In view of the above problems, the present invention provides a special detector for blade profile clearance, which improves the existing digital display detection instrument, can better adapt to the detection of small profile gaps, high-precision, fast and efficient detection needs, and replaces the current manual Three-coordinate measurement method and conventional feeler gauge detection method. The tool has the advantages of low production cost, high precision, convenient and flexible operation, small size, high detection efficiency and easy popularization.

Its technical solution is as follows: it includes a base, a displacement sensor, and a guide device, and the guide device is fixed on the base, and the displacement sensor is connected with the guide device through a fixed block, and it is characterized in that: It also includes a cone feeler gauge, which is connected to the guide device through an "L" beam, and the contact head of the displacement sensor is in contact with the positioning surface of the cone feeler gauge.

It is further characterized by:

The conical feeler gauge is a conical needle-shaped structure; the guide device includes a guide sleeve and a spring, the guide sleeve is set outside the short side of the "L" shaped beam, and the spring is placed on the guide sleeve Inside, one end is axially connected to the short side of the "L"-shaped beam, and the other end is directly fixed on the base; the tail of the displacement sensor is sleeved inside the fixed block and can be connected to the fixed block. sliding, the fixed block is fixed on the outer wall of the guide sleeve.

The present invention is also provided with a reference positioning device, which includes a reference detection platform, and a reference alignment groove is opened on the reference detection platform, and the depth of the reference alignment groove is 3mm.

Using the vernier feeler gauge for digital display detection of the blade profile gap of the present invention to detect the light transmission gap of the blade profile, the detection accuracy is high, the operation is convenient and flexible, the detection efficiency is greatly improved, and its volume is small, only the existing digital display is required The detection instrument is improved, the production cost is low, and it is easy to popularize.

(4) Description of drawings

Figure 1. The attached drawing of the blade profile detection tolerance is the description of the detection content;

Fig. 2 is a schematic diagram of the structure of a vernier feeler gauge for digital display detection of blade profile clearance;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is a schematic diagram of the detection principle of the blade profile clearance;

Fig. 5 is a schematic diagram of the detection position of the blade profile clearance.

(5) Specific implementation methods

See Figure 2 and Figure 3, the vernier feeler gauge for blade profile clearance digital display detection includes a base 6, a displacement sensor 5, a guide device and a cone feeler gauge 1, the guide device is fixed on the base 6, and the displacement sensor 5 passes through the fixed block 11 The connection with the guide device, the conical feeler gauge 1 is a conical needle-shaped structure, which is connected to the guide device through an "L" shaped beam 2, and the contact surface of the displacement sensor 5 is in contact with the positioning surface of the cone feeler gauge 1; the guide device includes The guide sleeve 3 and the spring 4 are set, the guide sleeve 3 is set outside the short side of the "L" shaped beam 2, the spring 4 is inside the guide sleeve 3, and one end of the spring 4 is connected to the short side axis of the "L" shaped beam 2 The other end is directly fixed on the base 6; the tail of the displacement sensor 5 is set inside the fixed block 11, and the displacement sensor 5 can be horizontally displaced relative to the fixed block 11, and the fixed block 11 is fixed on the outer wall of the guide sleeve 3 The present invention is also provided with a reference positioning device, which includes a reference detection platform 7, and a reference alignment groove 8 is opened on the reference detection platform 7, and the depth of the reference alignment groove is 3mm.

When performing reference positioning on the special detector for blade profile clearance of the present invention, as shown in Figure 2, the base 7 is placed on the reference detection platform 7, and the lower end of the conical feeler gauge is inserted into the reference alignment groove 8 to contact the bottom of the groove. The ruler has moved 3mm vertically downward (the depth of the reference alignment groove), and the displacement sensor should have moved 3mm vertically upward relative to the positioning surface of the tapered feeler gauge. If there is any deviation, the reference adjustment can be performed.

When using a special detector for the blade profile gap to detect the blade profile gap, see Figure 4 and Figure 5, the base 6 is placed on the circular arc large envelope sample 9, and the working surface of the conical feeler gauge 1 is in line with the profile of the blade to be tested. Surface 10 fit, press down the horizontal long side part of the "L" shaped beam, then the conical feeler gauge 1 is vertically inserted into the gap between the blade profile 10 to be tested and the circular arc large envelope template 9 until the positioning surface of the conical feeler gauge 1 Fitting with the arc large envelope template 9, during this process, the spring 4 in the guide device is compressed downward, and the guide sleeve 3 and the displacement sensor 5 have the same vertical upward displacement relative to the cone feeler gauge 1, and the displacement at the same time The sensor 5 also has a horizontal displacement to the right relative to the tapered feeler gauge 1, and this horizontal displacement is the blade profile gap to be detected and the data is output by the displacement sensor.

Claims (5)

1. special blade profile gap detector, it comprises pedestal, displacement transducer, guide piece, described guide piece is fixed on the described pedestal, described displacement transducer is connected with described guide piece by fixed block, it is characterized in that: it also comprises the circular cone clearance gauge, it is connected with described guide piece by " L " ellbeam, and described displacement transducer contact head contacts with the locating surface of described circular cone clearance gauge.

2. described special blade profile gap detector according to claim 1, it is characterized in that: described circular cone clearance gauge is the circular cone acicular texture.

3. described special blade profile gap detector according to claim 2, it is characterized in that: described guide piece comprises pilot sleeve and spring, described pilot sleeve is sleeved on the minor face outside of described " L " ellbeam, described spring is inner at described pilot sleeve, the one end axially is connected with the minor face of described " L " ellbeam, and the other end directly is fixed on the described pedestal.

4. described special blade profile gap detector according to claim 3 is characterized in that: described displacement transducer afterbody be sleeved on described fixed block inner and can and fixed block between slippage occurs, described fixed block is fixed on described pilot sleeve lateral wall.

5. described special blade profile gap detector according to claim 2, it is characterized in that: it also is provided with reference location device, described locating device comprises a benchmaring platform, has a benchmark alignment grooves on the described benchmaring platform, described benchmark contraposition groove depth 3mm.

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