CN106643619B - Propeller blade thickness measuring device, measuring system and measuring method - Google Patents
Propeller blade thickness measuring device, measuring system and measuring method Download PDFInfo
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- CN106643619B CN106643619B CN201710073916.3A CN201710073916A CN106643619B CN 106643619 B CN106643619 B CN 106643619B CN 201710073916 A CN201710073916 A CN 201710073916A CN 106643619 B CN106643619 B CN 106643619B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 47
- 239000004065 semiconductor Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 10
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims 1
- 238000005266 casting Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
Abstract
The invention discloses a propeller blade thickness measuring device, a propeller blade thickness measuring system and a propeller blade thickness measuring method, wherein the propeller blade thickness measuring device comprises a U-shaped accessory; the two ends of the U-shaped accessory are respectively a fixed end and a measuring end; the inner side of the fixed end of the U-shaped accessory is provided with a support leg, and the outer side of the fixed end of the U-shaped accessory is provided with a spring tip shell; the supporting leg is a three-leg support, the bottoms of the three supporting legs of the supporting leg are positioned on the same horizontal plane A, and the connecting line of the bottoms of the three supporting legs is in a regular triangle shape. The propeller blade thickness measuring device, the propeller blade thickness measuring system and the propeller blade thickness measuring method are simple in structure, low in cost and accurate in measurement.
Description
Technical Field
The invention relates to a low-cost propeller blade thickness rapid measuring device, a measuring system and a measuring method.
Background
At present, for the measurement of the thickness of the propeller blade, the dimension needing to be measured is the thickness of a certain point on the surface of the blade along the normal direction, and the key of the problem is solved: the normal direction of the appointed point is found, but the existing measuring device is complex in equipment and expensive in software and hardware equipment.
Particularly, the point cloud data of the blade casting are obtained by using a 3D scanner, and the thickness of the blade is measured in software. Although the method has high precision, the measurement cost is high, the measurement efficiency is low, and enterprises are confronted with an embarrassing situation that the measurement cost is far higher than the profit of parts.
Therefore, it is an urgent need to develop a measuring device that can perform measurement, has simple equipment, and is low in cost.
Disclosure of Invention
According to the technical problems provided by the above, a propeller blade thickness measuring device, a propeller blade thickness measuring system and a propeller blade thickness measuring method are provided, which are used for solving the defects that the existing propeller blade thickness measuring device is complex in equipment and expensive in software and hardware equipment. The technical means adopted by the invention are as follows:
a propeller blade thickness measuring device comprises a U-shaped accessory; two ends of the U-shaped accessory are respectively a fixed end and a measuring end; the inner side of the fixed end of the U-shaped accessory is provided with a support leg, and the outer side of the fixed end of the U-shaped accessory is provided with a spring centre shell; the supporting leg is a three-leg support, the bottoms of the three supporting legs of the supporting leg are positioned on the same horizontal plane A, and the connecting line of the bottoms of the three supporting legs is in a regular triangle shape.
A spring center is arranged in the spring center shell, and a spring is arranged between the spring center and the inner wall of the spring center shell, so that the front end of the spring center can penetrate through the fixed end of the U-shaped accessory and extend out to the bottom of the supporting leg; the axis where the spring tip is located is vertical to the horizontal plane A where the bottoms of the supporting legs are located; the measuring end of the U-shaped accessory is detachably connected with a micrometer screw, and the front end of the micrometer screw is provided with a lower tip; the spring center and the lower center are coaxially arranged, and the tip parts are oppositely arranged.
Preferably, an annular protrusion for limiting is arranged on one side, close to the support leg, of the spring center, so that one end of the spring is pressed against the annular protrusion, and the other end of the spring is pressed against the inner wall of the shell of the spring center.
The outer wall of the mounting section of the screw micrometer is preferably in threaded connection with the measuring end of the U-shaped accessory.
A measuring system comprises a positioning device for a point to be measured of a blade and a thickness detecting device for the point to be measured of the blade; the thickness detection device for the point to be measured of the blade is the propeller blade thickness measuring device; the positioning device for the point to be measured of the blade comprises a centering upright post, a semiconductor laser emitter, a three-jaw chuck and a rotating arm.
A propeller is clamped in the middle of the three-jaw chuck, and the upper surface of the three-jaw chuck is provided with an index plate; the centering upright post is arranged on the outer side of the three-jaw chuck and comprises a supporting part which is vertically arranged and a fixing part which is horizontally arranged; the centering upright post fixing part is provided with a rotating arm, the center of the rotating arm is rotatably connected with the fixing part, and the center of the rotating arm is coaxial with the blade axis of the propeller; the end part of the rotating arm is provided with a semiconductor laser emitter for indicating the position of a point to be measured in real time; the thickness detection device for the blade point to be measured can measure the thickness of the point to be measured indicated by the semiconductor laser emitter.
Preferably, the fixing part of the centering upright post is vertically connected with the top end of the supporting part.
Preferably, the semiconductor laser transmitter is capable of rotating around an R190 circle when the rotary arm rotates with respect to the center of the rotary arm.
A measuring method using the measuring system comprises the following steps:
s1, clamping the propeller on a three-jaw chuck of the blade point-to-be-measured positioning device.
And S2, rotating the rotating arm to enable the light spot of the semiconductor laser emitter to fall on the edge of the blade of the propeller, and marking the laser point, namely the point to be measured, namely the point C1.
And S3, sequentially rotating the three-jaw chuck with the index plate by 16 degrees, and marking the points to be measured, namely C2 points and C3 points on the surface of the blade of the propeller.
And S4, measuring the thickness values of the point to be measured, namely the point C1, the point C2 and the point C3 in sequence by using a blade point to be measured thickness detection device.
The measurement as preferred S4 comprises in particular the following steps:
and S41, overlapping the spring tip with the point to be measured.
And S42, adjusting the support legs to be stably supported on the curved surface of the blade of the propeller.
S43, rotating the spiral micrometer to enable the lower tip to be in close contact with the lower surface of the blade, and reading.
And S44, repeating the measurement three times, recording data, and averaging to obtain the thickness of the propeller blade at the point.
Compared with the prior art, the propeller blade thickness measuring device, the propeller blade thickness measuring system and the propeller blade thickness measuring method have the advantages that the support legs of the propeller blade thickness measuring device are three-leg supports, the bottoms of the three legs of the support legs are positioned on the same horizontal plane A, and the connecting lines of the bottoms of the three legs are in a regular triangle shape; the axis where the spring tip is located is vertical to the horizontal plane A where the bottoms of the supporting legs are located; the measuring device has the advantages of simple structure, low cost and accurate measurement.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the structure of the propeller blade thickness measuring apparatus of the present invention.
FIG. 2 is a schematic view of a measurement system of the present invention.
FIG. 3 is a schematic view of a propeller blade of the present invention.
FIG. 4 is a schematic view of a propeller blade thickness measuring device of the present invention.
Fig. 5 is a schematic view of a foot of the present invention.
Fig. 6 is a schematic view of a spring tip housing and spring tip of the present invention.
Fig. 7 is a schematic view of the operation of the propeller blade thickness measuring apparatus of the present invention.
FIG. 8 is a diagram showing the measurement of the normal line in the engineering practice of the present invention.
Fig. 9 is a schematic diagram of the principle of the normal measurement of the present invention.
FIG. 10 is a representation of the Gaussian curvature rendering of the present invention.
FIG. 11 is a schematic view of the positions of points to be measured on the propeller blades of the present invention.
FIG. 12 is a schematic view of a right triangle taken in the vicinity of a propeller blade according to the present invention.
Fig. 13 is a graph of measured data at C1 of the present invention (θ =0 °).
Fig. 14 is a line graph (θ =0 °) of the measurement data at C1 of the present invention.
Fig. 15 is a graph of measured data at C1 of the present invention (θ =30 °).
Fig. 16 is a line graph (θ =30 °) of the measurement data at C1 of the present invention.
Fig. 17 is a graph of measured data at C1 of the present invention (θ =60 °).
Fig. 18 is a line graph (θ =60 °) of the measurement data at C1 of the present invention.
Fig. 19 is a graph of measured data at C1 of the present invention (θ =90 °).
Fig. 20 is a line graph (θ =90 °) of the measurement data at C1 of the present invention.
Fig. 21 is a graph of measured data at C2 of the present invention (θ =0 °).
Fig. 22 is a line graph (θ =0 °) of the measurement data at C2 of the present invention.
Fig. 23 is a graph of measured data at C2 of the present invention (θ =30 °).
Fig. 24 is a line graph (θ =30 °) of the measurement data at C2 of the present invention.
Fig. 25 is a graph of measured data at C2 of the present invention (θ =60 °).
Fig. 26 is a line graph (θ =60 °) of the measurement data at C2 of the present invention.
Fig. 27 is a graph of measured data at C2 of the present invention (θ =90 °).
Fig. 28 is a line graph (θ =90 °) of the measurement data at C2 of the present invention.
Fig. 29 is a graph of measured data at C3 of the present invention (θ =0 °).
Fig. 30 is a line graph (θ =0 °) of the measurement data at C3 of the present invention.
Fig. 31 is a graph of measured data at C3 of the present invention (θ =30 °).
Fig. 32 is a line graph (θ =30 °) of the measurement data at C3 of the present invention.
Fig. 33 is a graph of measured data at C3 of the present invention (θ =60 °).
Fig. 34 is a line graph (θ =60 °) of the measurement data at C3 of the present invention.
Fig. 35 is a graph of measured data at C3 of the present invention (θ =90 °).
Fig. 36 is a line graph (θ =90 °) of the measurement data at C3 of the present invention.
Wherein: 1. a centering upright post, 2, a semiconductor laser emitter, 3, a special measuring tool for the thickness of a propeller blade, 4, a three-jaw chuck, 5, a rotating arm, 6 and a propeller,
31. the spring, 32, the spring tip shell, 33, the support leg, 34, the spring tip, 35, the lower tip, 36, the U-shaped accessory, 37 and the screw micrometer.
Detailed Description
As shown in fig. 1, a propeller blade thickness measuring device includes a U-shaped attachment 36; two ends of the U-shaped accessory 36 are respectively a fixed end and a measuring end; the inner side of the fixed end of the U-shaped accessory 36 is provided with a support leg 33, and the outer side is provided with a spring center shell 32; the supporting foot 33 is a three-leg support, the bottoms of the three legs of the supporting foot 33 are located on the same horizontal plane A, the connecting line of the bottoms of the three legs is a regular triangle, and the supporting foot 33 is used for determining the normal direction of the point to be measured of the propeller blade.
A spring center 34 is arranged in the spring center shell 32, a spring 31 is arranged between the spring center 34 and the inner wall of the spring center shell 32, the front end of the spring center 34 can penetrate through the fixed end of the U-shaped accessory 36 and extend out of the bottom of a supporting leg of the supporting leg 33, and the spring center shell 32 is used for bearing the spring 31 and the spring center 34.
An annular protrusion for limiting is arranged on one side of the spring centre 34 close to the support leg 33, so that one end of the spring 31 is pressed against the annular protrusion, and the other end of the spring is pressed against the inner wall of the spring centre shell 32.
The spring 31 is a low-rigidity and small-damping spring, and can realize the axial expansion function of the spring tip 34. The axis of the spring center 34 is vertical to the horizontal plane A of the bottom of the supporting leg 33; the spring tip 34 is used for indicating the point to be measured of the propeller blade.
The spring point housing 32 is in a detachable fixed form and is in threaded connection with the fixed end of the U-shaped attachment 36, and the support leg 33 is in threaded connection with the fixed end of the U-shaped attachment 36.
The measuring end of the U-shaped accessory 36 is detachably connected with a micrometer screw 37, and preferably, the outer wall of the mounting section of the micrometer screw 37 is in threaded connection with the measuring end of the U-shaped accessory 36.
The front end of the micrometer screw 37 is provided with a lower tip 35; the spring center 34 and the lower center 35 are coaxially arranged, the tips of the spring center and the lower center are opposite, and the lower center 35 is used for determining the position of the lower surface point of the propeller blade.
The micrometer screw gauge 37 is used for accurately measuring the thickness of the point to be measured of the propeller blade. The U-shaped accessory 36 can be replaced by various types and used for bearing other parts and ensuring that the spring tip 34 is coaxial with the lower tip 35.
The height of the U-shaped accessory 36 is H, the H is preferably 30mm, 60mm or 90mm, and different types of U-shaped accessories can be selected according to the position of a point to be measured of the blade during field measurement.
As shown in fig. 3, the distance of the C1, C2, C3 points from the edge of the propeller blade, in fig. 3 25mm, should be taken to be a U-shaped attachment of the type H = 30.
But if the field wanted to measure the thickness at a point further from the blade edge, for example at a point 50 from the blade edge, then the bottom of the u-shaped attachment is blocked by the blade edge due to size limitations when H =30 < 50. Therefore, the U-shaped attachment of the H =60 model should be replaced at this time. The U-shaped accessory is made into an alternative form, so that the measuring tool is suitable for different measuring positions, and the measuring requirements of different positions are met.
As shown in fig. 1 to 7, a measuring system includes a positioning device for a point to be measured of a blade and a thickness detecting device for the point to be measured of the blade; the thickness detection device of the blade point to be measured is the propeller blade thickness measurement device; the positioning device for the point to be measured of the blade comprises a centering upright post 1, a semiconductor laser emitter 2, a three-jaw chuck 4 and a rotating arm 5, and radial and circumferential positioning of the point to be measured of the blade is realized.
A propeller 6 is clamped in the middle of the three-jaw chuck 4, and the upper surface of the three-jaw chuck 4 is provided with an index plate; the three-jaw chuck 4 is used for clamping and positioning the blades of the propeller 6 by utilizing the clamping and positioning functions of the three-jaw chuck 4; and secondly, the accurate angular rotation of the workpiece is realized by utilizing the indexing disc device.
The centering upright post 1 is arranged on the outer side of the three-jaw chuck 4, and the centering upright post 1 comprises a supporting part which is vertically arranged and a fixing part which is horizontally arranged; preferably, the fixing part of the centering upright post 1 is vertically connected with the top end of the supporting part. A rotating arm 5 is arranged on the fixing part of the centering upright post 1, the center of the rotating arm 5 is rotatably connected with the fixing part, and the center of the rotating arm 5 is coaxial with the blade axis of the propeller 6; the end part of the rotating arm 5 is provided with a semiconductor laser emitter 2 for indicating the position of a point to be measured in real time; the semiconductor laser emitter 2 is commonly called a laser pen, has high light condensation performance, can realize a non-contact indication function, and can indicate the position of a point to be measured in real time.
The thickness detection device for the blade point to be measured can measure the thickness of the point to be measured indicated by the semiconductor laser emitter 2. When the rotary arm 5 rotates with respect to the center of the rotary arm 5, the semiconductor laser transmitter 2 can rotate in a circle of R190. The rotary arm 5 is used for bearing the semiconductor laser emitter 2 and determining the circumference of R190.
As shown in fig. 1 to 7, a measuring method using the above measuring system includes the steps of:
s1, clamping a propeller 6 on a three-jaw chuck 4 of a blade point-to-be-measured positioning device.
S2, rotating the rotating arm 5 to enable the light spot of the semiconductor laser emitter 2 to fall on the edge of the blade of the propeller 6, and marking the laser point, namely the point to be measured, namely the point C1.
And S3, sequentially rotating the three-jaw chuck 4 with the index plate by 16 degrees, and marking the points to be measured, namely the points C2 and the points C3 on the surface of the blade of the propeller 6 in the same way.
And S4, measuring the thickness values of the point to be measured, namely the point C1, the point C2 and the point C3 in sequence by using a blade point to be measured thickness detection device.
The measurement of S4 specifically includes the following steps:
and S41, the spring center 34 is overlapped with the point to be measured.
And S42, adjusting the support legs 33 to be stably supported on the curved surface of the blade of the propeller 6.
S43, rotating the screw micrometer 37 to enable the lower tip 35 to be in close contact with the lower surface of the blade, and reading.
And S44, repeating the measurement for three times, recording data, and averaging the data to obtain the thickness of the propeller 6 blade at the point.
In the measurement, the thickness values of a C1 point, a C2 point and a C3 point are measured according to a propeller design drawing. Since the propeller blades are high-order curved surfaces, the blade thickness is not equal everywhere.
Therefore, in order to represent information on the thickness of the propeller blade, it is necessary to take a specific point at a specific position and give thickness information at the specific point. The processing mode of the propeller blade is casting, and after the propeller blade is cast and formed, the thicknesses of the blank at the three points are measured so as to investigate whether the casting precision meets the requirement.
As shown in FIG. 3, the measuring method of the present invention measures the machining dimensions C1, C2, C3 (note: the thickness of the blade in the normal direction at this point), first determines the R190 circle; determining the positions of the lines of 16 degrees, 32 degrees and 48 degrees by taking the edge of the blade as a reference, namely determining C1, C2 and C3 points; finally, the special measuring tool for the thickness of the propeller blade is used for measuring the thickness of the blade, and the measuring device is simple in structure, low in cost and accurate in measurement.
The design principle of the propeller blade thickness measuring device is an original three-point method, and the rationality of the method is theoretically demonstrated.
1. The key of measurement is as follows: and the normal direction of a certain point on the surface of the blade is determined, and the normal direction is presented in real time in a real object form, so that the measurement is convenient. The conversion to the mathematical problem is: and calculating the normal direction of a certain point of the free-form surface.
2. The measurement idea is as follows: 'substitution of flour'
2.1 As shown in FIG. 8, in engineering practice, to real-time represent the normal direction of a certain point on a plane, it is usually implemented by a triangular panel with a pillar. The principle is that, as shown in FIG. 9, the normal of any point P in the plane
Equivalent to the normal of the plane of the three points in the neighborhood
Namely, it is
2.2 similarly, when the curvature of a curved surface is small, the normal of the point to be measured can be approximately replaced by the normal of the plane where the three points in the neighborhood of the point to be measured are located, namely, the three-point method.
2.3 application preconditions of the "three-point method": the curvature of the curved surface is small and the change is not large, and the curved surface can be approximately regarded as a plane in the neighborhood of the point to be measured.
Verifying whether the model meets the application precondition of a' three-point method
1. And introducing a step model of a certain type of propeller blade into Creo.
2. And judging the curvature of the curved surface at the point to be measured and the curvature change around the point to be measured by displaying the Gaussian curvature of the curved surface of the blade.
3. The result is shown in fig. 10, the curvature values of the points to be measured C1, C2, and C3 are 0.0024, 0.0009, and 0.004, respectively, and the curvature of the points to be measured and their neighboring points are all small.
The color of the cloud pictures in the neighborhood of the point to be measured is the same, which shows that the curvature of the curved surface has little change.
In summary, a "three-point method" can be applied to determine the normal direction of the point to be measured.
Application of three-point method and experimental data analysis
1. In Creo, the points to be measured C1, C2, C3 are marked, as shown in FIG. 11.
2. Three points A, B, C are taken in the neighborhood of C1, C2 and C3 as the center to form a regular triangle as shown in FIG. 12.
In order to determine the optimal size of the triangular patch, the side length S of the regular triangle is taken as a variable; in order to ensure the uniformity and representativeness of the three points, the included angle theta between the altitude of the regular triangle and the connecting line of the point to be measured and the center of the blade is taken as a variable, and the thickness of the blade on the normal vector of the triangular surface patch is measured by using the measuring function of Creo and is compared with the standard thickness. The data obtained at C1, see FIGS. 13-20, and the data obtained at C2, C3, see FIGS. 21-36.
3. And (3) analysis of experimental results:
3.1 as can be seen from fig. 14, 16, 18, and 20, as the side length S of the regular triangle increases (i.e., as the area of the triangle patch increases), the measurement error increases.
The measurement result is shown to be influenced by the side length S of the regular triangle. Therefore, in order to ensure that the measurement error is small, the side length should be small.
3.2 as can be seen from fig. 13, 15, 17, and 19, θ is different, and the measurement results are also different.
The measurement result is shown to be influenced by the included angle theta between the altitude of the regular triangle and the connecting line of the point to be measured and the center of the blade. However, the errors are all less than 0.04mm, and the measurement error of the size can be accepted.
3.3 the measurement specification requires, the design tolerance of C1, C2 and C3 is-0.3- +0.8mm, in order to reduce the principle error of measurement as far as possible, when the measuring tool is finally designed, the side length of the triangular patch should be preferably 10mm smaller, and the principle error of measurement can be controlled within 0.02 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A measuring system comprises a blade point-to-be-measured thickness detection device;
the thickness detection device of the blade point to be measured is a propeller blade thickness measurement device;
the propeller blade thickness measuring device comprises a U-shaped accessory (36);
two ends of the U-shaped accessory (36) are respectively a fixed end and a measuring end;
a support leg (33) is arranged on the inner side of the fixed end of the U-shaped accessory (36), and a spring center shell (32) is arranged on the outer side;
the supporting leg (33) is a three-leg support, the bottoms of the three supporting legs of the supporting leg (33) are positioned on the same horizontal plane A, and the connecting line of the bottoms of the three supporting legs is in a regular triangle shape;
a spring center (34) is arranged in the spring center shell (32), and a spring (31) is arranged between the spring center (34) and the inner wall of the spring center shell (32), so that the front end of the spring center (34) can penetrate through the fixed end of the U-shaped accessory (36) and extend out to the bottom of the supporting leg (33);
the axis of the spring center (34) is vertical to the horizontal plane A of the bottom of the leg of the supporting leg (33);
the measuring end of the U-shaped accessory (36) is detachably connected with a micrometer screw (37), and the front end of the micrometer screw (37) is provided with a lower tip (35);
the spring center (34) and the lower center (35) are coaxially arranged, and the tip parts are oppositely arranged;
the method is characterized in that:
the positioning device for the point to be measured of the blade is also included;
the positioning device for the point to be measured of the blade comprises a centering upright post (1), a semiconductor laser emitter (2), a three-jaw chuck (4) and a rotating arm (5);
a propeller (6) is clamped in the middle of the three-jaw chuck (4), and the upper surface of the three-jaw chuck (4) is provided with an index plate;
the centering upright post (1) is arranged on the outer side of the three-jaw chuck (4), and the centering upright post (1) comprises a supporting part which is vertically arranged and a fixing part which is horizontally arranged;
a rotating arm (5) is arranged on the fixing part of the centering upright post (1), the center of the rotating arm (5) is rotatably connected with the fixing part, and the center of the rotating arm (5) is coaxial with the axis of the blade of the propeller (6);
the end part of the rotating arm (5) is provided with a semiconductor laser emitter (2) for indicating the position of a point to be measured in real time;
the thickness detection device for the blade point to be measured can measure the thickness of the point to be measured indicated by the semiconductor laser emitter (2);
one side of the spring center (34) close to the support leg (33) is provided with an annular protrusion for limiting, so that one end of the spring (31) is pressed against the annular protrusion, and the other end of the spring is pressed against the inner wall of the spring center shell (32);
the outer wall of the mounting section of the micrometer screw (37) is in threaded connection with the measuring end of the U-shaped accessory (36).
2. The measurement system of claim 1, wherein:
the fixing part of the centering upright post (1) is vertically connected with the top end of the supporting part.
3. The measurement system of claim 1, wherein:
when the rotating arm (5) rotates relative to the center of the rotating arm (5), the semiconductor laser emitter (2) can rotate around the circumference of R190.
4. A measuring method using the measuring system according to any one of claims 1 to 3, characterized by comprising the steps of:
s1, clamping a propeller (6) on a three-jaw chuck (4) of a blade point-to-be-measured positioning device;
s2, rotating the rotating arm (5) to enable a light spot of the semiconductor laser emitter (2) to fall on the edge of a blade of the propeller (6), and marking a laser point, namely a point to be measured, namely a point C1;
s3, sequentially rotating the three-jaw chuck (4) with the index plate by 16 degrees, and marking points to be measured, namely points C2 and points C3 on the surface of the blade of the propeller (6) in the same way;
and S4, measuring the thickness values of the point to be measured, namely the point C1, the point C2 and the point C3 in sequence by using a blade point to be measured thickness detection device.
5. The measurement method according to claim 4, characterized in that:
the measurement of S4 specifically includes the following steps:
s41, overlapping the spring center (34) with a point to be measured;
s42, adjusting the support legs (33) to be stably supported on the curved surface of the blades of the propeller (6);
s43, rotating the screw micrometer (37) to enable the lower tip (35) to be in close contact with the lower surface of the blade, and reading;
and S44, repeating the measurement for three times, recording data, and averaging the data to obtain the thickness of the blade of the propeller (6) at the point.
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| CN107990843A (en) * | 2017-12-12 | 2018-05-04 | 镇江同舟螺旋桨有限公司 | The small area of space laser measuring head of marine propeller blade |
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