Device and method for measuring blade bottom angle

Abstract

The application discloses a kind of measuring device and method of vane bottom angle, measuring device includes base, branch, axle pin, touch rod, first bush, second bush, first screw, lever, cover plate, contact, spring, second screw, third bush, third screw, fourth screw, fifth screw, cylindrical pin, sixth screw, seventh screw, eighth screw and standard block.The angle change amount is converted into displacement change amount on indicating table by lever, so that whether vane bottom angle is qualified is obtained quickly quantitatively or qualitatively, is suitable for mass detection in production site, simple operation, and high measurement efficiency.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine processing technology, specifically a device and method for measuring the angle characteristics of rotor blades during the processing of components, and uses this device and method to determine whether the angle characteristics of the blades are qualified or not. Background Technology

[0002] Among the many components of an aero-engine, rotor blades play a crucial role in propelling the aircraft during flight, directly generating thrust. Therefore, their design and manufacturing have a significant impact on engine performance and efficiency, and high-quality blades provide strong assurance for flight safety. Due to the high precision and complex shape of blades, inspection is extremely cumbersome. Furthermore, the inspection of blade base angle characteristics requires full inspection, involving a large volume of samples and a limited inspection cycle, making laboratory testing unsuitable. In addition, high-precision testing equipment is not suitable for production sites due to both demanding operational requirements and high testing costs. For these reasons, a user-friendly device and method for measuring blade base angles is needed to meet the inspection needs of production sites. Summary of the Invention

[0003] The present invention aims to provide a device and method for measuring the blade base angle, which is suitable for large-scale on-site testing operations. The device and measurement method are low in cost, high in efficiency, and simple to operate, and can quickly determine whether the blade base angle is qualified qualitatively or quantitatively.

[0004] The technical solution of the present invention is as follows:

[0005] A device for measuring the blade base angle, including,

[0006] The base has a horizontal mounting surface and a blade mounting surface A at an angle α to the direction perpendicular to the horizontal mounting surface;

[0007] The lever is arranged parallel to the horizontal mounting surface, and the lever forms a rotating pair with the base through a rotating shaft perpendicular to the horizontal mounting surface. The lever includes a first contact end and a second contact end.

[0008] The first bushing and the contact are located in the same plane and are arranged parallel to each other. The plane in which the first bushing and the contact are located is parallel to the horizontal mounting surface. The ends of the first bushing and the contact are coplanar in a plane perpendicular to the horizontal mounting surface.

[0009] The contact rod is arranged parallel to the horizontal mounting surface and slidably connected inside the first bushing. The contact rod includes a first end that contacts the blade and a second end that contacts the first contact end of the lever. The vertical distance h between the first end of the contact rod and the plane where the first bushing and the contact are located is ;

[0010] An indicator, wherein the measuring end of the indicator contacts the second contact end of the lever and measures the displacement of the second contact end;

[0011] A spring, one end of which is in close contact with the lever, and the contact position is located between the lever's pivot and the second contact end. The direction of the force torque exerted by the spring on the lever is opposite to the direction of the force torque exerted by the contact rod on the lever.

[0012] A limiting rod, one end of which points toward the lever and there is a gap between the limiting rod and the lever. When the lever contacts the limiting rod, the direction of the force torque exerted by the limiting rod on the lever is opposite to the direction of the force torque exerted by the spring on the lever.

[0013] A standard block, comprising a base surface a and an inclined surface at an angle α to the base surface a, wherein both the base surface a and the inclined surface are planes.

[0014] Furthermore, the blade mounting surface A comprises multiple protrusions, with grooves between adjacent protrusions, and the upper surfaces of the protrusions are coplanar. For larger blade mounting surfaces A, if machining is difficult, it is divided into multiple smaller but coplanar planes. The grooves between adjacent protrusions serve as relief grooves during milling, thus facilitating the machining of the blade mounting surface A.

[0015] Furthermore, the measuring device for the blade base angle also includes a support block, which is detachably connected to the horizontal mounting surface of the base. The support block has a lever shaft hole and a bushing mounting hole, and the first bushing is inserted into the bushing mounting hole.

[0016] Furthermore, the support block is connected to the horizontal mounting surface of the base by cylindrical pins and screws.

[0017] Furthermore, the lever is rotatably connected to the lever shaft hole via a shaft consisting of a coaxially assembled pin and a second bushing, and the lever is connected to the pin via a first screw.

[0018] Furthermore, the measuring device for the blade base angle also includes a contact rod limiting groove, a limiting screw hole, and a seventh screw. The contact rod limiting groove is located on the contact rod and extends along the axial direction of the contact rod. The limiting screw hole passes through both the support block and the first bushing. The seventh screw is connected in the limiting screw hole and its end is located in the contact rod limiting groove.

[0019] Furthermore, it also includes a cover plate, which is detachably mounted above the support block such that at least a portion of the support block is located inside the cover plate, the spring is mounted on the side of the support block by a second screw, the limiting rod is mounted on the side of the support block opposite to the spring, and the indicator is mounted on the support block on the same side as the spring by a third bushing.

[0020] Alternatively, the coplanar ends of the first bushing and the contact are ball-shaped, and both the first and second ends of the contact rod are ball-shaped.

[0021] Alternatively, the first contact end and the second contact end of the lever are two mutually perpendicular planes, wherein the line of intersection of the plane containing the first contact end and the plane containing the second contact end coincides with the axis of rotation of the lever.

[0022] The method for measuring the blade base angle uses the aforementioned measuring device and includes the following steps:

[0023] Step 1: Place the bottom surface a of the standard block tightly against the blade mounting surface A of the measuring device, so that three points—the coplanar ends of the first bushing and the contact, and the first end of the contact rod—simultaneously contact the inclined surface on the standard block. This utilizes the principle of defining a plane using a straight line and a point outside the line (i.e., a straight line formed by the coplanar ends of the first bushing and the contact, and the point formed by the first end of the contact rod outside the line). This ensures that the surface of the blade being measured is the plane corresponding to the bottom angle α (i.e., always ensuring that it is an angle between planes; it can be understood that the straight line formed by the coplanar ends of the first bushing and the contact is always parallel to the bottom surface of the blade to be measured, and all surfaces of the blade to be measured are planes rotating around this straight line, while the first end of the contact rod defines one of many planes). This avoids the measured object becoming an angle between a line and a plane. On the other hand, it also plays a role in stabilizing and positioning the blade, thus forming a supporting and positioning surface.

[0024] Step 2: Read the reading on the indicator, remove the standard block, and reset the indicator reading to zero;

[0025] Step 3: Place the blade to be measured on the blade mounting surface A, so that the ends of the first bushing and the contact, and the first end of the contact rod, a total of three points, simultaneously contact the surface of the blade to be measured at an angle α with the blade mounting surface A.

[0026] Step 4: Read the reading on the indicator again, calculate the difference between this reading and the reading in Step 2, and convert the tolerance range of the blade bottom angle α into a displacement range by combining the displacement amplification ratio of the first and second contact ends on the lever. Then compare the difference with the reading on the indicator. If the difference falls within the displacement range corresponding to the tolerance range of the blade bottom angle α, the bottom angle is qualified. If the difference falls outside the displacement range corresponding to the tolerance range of the blade bottom angle α, the bottom angle is unqualified.

[0027] For example, when the vertical distances (lever arms) from the first and second contact ends of the lever to the lever's axis of rotation are equal, since the lever is a rigid structure, the central angles of rotation of the first and second contact ends are the same. Consequently, the sliding displacement of the contact rod is equal to the difference between the two readings on the indicator. In this case, the displacement amplification ratio of the lever does not need to be considered. When the vertical distances (lever arms) from the first and second contact ends to the lever's axis of rotation are not equal, the displacement amplification ratio is obtained based on the ratio of the two lever arms. The sliding displacement of the contact rod is then calculated by comparing the difference between the two readings on the indicator. By comparing whether this sliding displacement falls within the displacement range corresponding to the tolerance range of the blade bottom angle α, it can be determined whether the angle is qualified.

[0028] Compared with existing technologies, this invention provides a device and method for measuring the base angle of blades. By comparing the measurement with the angle of a standard block, it can quickly determine whether the angular characteristics of the product are qualified, greatly improving work efficiency. The measuring device has a compact structure, low manufacturing cost, and is simple to use. It is suitable for large-scale on-site measurement and rapid result acquisition, and can perform both qualitative and quantitative testing. Of course, this invention can also be used in other fields suitable for angular characteristic measurement. Attached Figure Description

[0029] Figure 1 This is the front view of the numbing measuring device;

[0030] Figure 2 This is a top view of the measuring device of the present invention;

[0031] Figure 3 This is the front view of the standard block used for measurement;

[0032] Figure 4 This is a schematic diagram illustrating the measurement principle of the present invention;

[0033] In the diagram, 1-base, 2-support block, 3-shaft pin, 4-contact rod, 5-first bushing, 6-second bushing, 7-first screw, 8-lever, 9-cover plate, 10-contact, 11-spring, 12-second screw, 13-third bushing, 14-third screw, 15-fourth screw, 16-fifth screw, 17-cylindrical pin, 18-sixth screw, 19-seventh screw, 20-eighth screw. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0035] like Figures 1-3As shown, the blade base angle measuring device of the present invention includes a base 1, a support block 2, a shaft pin 3, a contact rod 4, a first bushing 5, a second bushing 6, a first screw 7, a lever 8, a cover plate 9, a contact 10, a spring 11, a second screw 12, a third bushing 13, a third screw 14, a fourth screw 15, a fifth screw 16, a cylindrical pin 17, a sixth screw 18, a seventh screw 19, an eighth screw 20, and a standard block.

[0036] like Figure 1 and Figure 2 As shown, the base 1 has a surface A at an angle α to the vertical direction, which serves as the blade mounting surface. Figure 1 The plane marked with the letter A in the middle), the angle α is equal to the base angle α of the blade being measured. Support block 2 is fixed to base 1 by two cylindrical pins 17, two fifth screws 16, and two sixth screws 18 (because one side of support block 2 is convex, resulting in a different height, the lengths of the fifth screw 16 and the sixth screw 18 are also different; the fifth screw 16 is longer than the sixth screw 18). One side of support block 2 ( Figure 2 A spring 11 is installed on the upper middle part of the lever 8. The second screw 12 is used to tighten the spring 11 to prevent it from falling off. A third bushing 13 is installed next to the spring 11 to fix the position of the indicator and install the indicator (specifically, the eighth screw 20 is used to tighten the third bushing 13 to fix the indicator). The indicator (which can be a dial indicator or a micrometer indicator) is installed in it; on the other side of the support block 2 ( Figure 2 A fourth screw 15 is installed at the lower center as a limiting rod. A gap is left between the end of the fourth screw 15 and the lever 8 to prevent the lever 8 from rotating excessively under the action of the spring 11, thus overloading and damaging the indicator. A first bushing 5 with a ball contact is installed in front of the support block 2 (corresponding to...). Figure 2 One side of the left side of the middle support block 2 (corresponding to) Figure 2 (Lower middle), contact 10 is installed in front of support block 2 (corresponding to) Figure 2 The other side of the left side of the middle support block 2 (corresponding to) Figure 2 The upper middle part), symmetrically distributed with the first bushing 5, the highest point of the contact of the first bushing 5 (i.e. Figure 1 The leftmost end of the upper surface of the first bushing 5 and the highest point of the contact 10 (i.e., Figure 1 The leftmost end of the upper surface of the middle contact 10 is on the same horizontal plane, and the end of the first bushing 5 and the end of the contact 10 are coplanar (i.e., Figure 2 (The coplanar positions marked in the middle); the contact rod 4, with ball contacts at both ends, is inserted into the hole of the first bushing 5, and the highest point of the front contact of the contact rod 4 (i.e., the highest point of the ball contact at both ends) is... Figure 1 The leftmost end of the middle contact rod 4 and the highest point of the contact on the first bushing 5 (i.e., Figure 1The upper surface of the first bushing 5 is kept at a certain vertical distance h from the leftmost end. The pivot pin 3 is installed on the support block 2, and the lever 8 is installed on the pivot pin 3 by the first screw 7, ensuring that the measuring surface on one side of the lever 8 is in contact with one end of the contact rod 4, and the measuring surface on the other side of the lever 8 is in contact with the indicator. The first screw 7 is adjusted to ensure that the lever 8 can rotate freely under the action of the spring 11. The cover plate 9 is installed on the support block 2 by the third screw 14 to prevent dust and debris from falling into the mechanism and affecting the measurement accuracy. The seventh screw 19 is adjusted so that it extends into the adjustment groove on the contact rod 4 to limit the sliding limit position of the contact rod 4 in the first bushing 5.

[0037] like Figure 3 It is a standard block with the same angle as the blade base angle α. Because the angle α of this standard block is very accurate, it is used as a standard angle for comparison and measurement with the blade base angle.

[0038] Figure 4 The principle of the measurement method of this invention is as follows: Figure 1 The arrangement of the blades to be measured, assuming... Figure 4 The angle α' is the maximum value of the base angle α (α' > α). At this time, it is equivalent to the hypotenuse of the blade being tested rotating clockwise by an angle (α' - α) to reach the position of the dotted line. The corresponding hypotenuse generates a displacement Δs parallel to the horizontal mounting surface of the base 1, and the displacement Δs is equal to the horizontal displacement of the contact rod 4. On the other hand, assuming that the height of the contact point between the contact rod 4 and the blade being tested to the horizontal mounting surface of the base 1 is H, since the height of the contact rod 4 relative to the horizontal mounting surface of the base 1 remains unchanged before and after the displacement, Δs = H × tan(α' - α) can be calculated through trigonometric function relationship. Therefore, as long as the difference between the readings of the standard block on the indicator and the blade being tested is calculated each time, and then the difference is compared with = H × tan(α' - α), if it is greater, it means that the base angle α of the blade being tested is out of range and is unqualified. Of course, if it is necessary to quantitatively calculate the specific size of α', then according to the above equation, Δs is replaced with the difference between the two readings of the indicator. α is known, and H is also known, so the value of α' can be calculated. Similarly, when α' is taken as the minimum value of the base angle α (α > α'), the conclusion is similar.

[0039] When using it, first place the standard block ( Figure 3Place the bottom surface a corresponding to angle α on surface A of the measuring device. Adjust the position of the standard block so that the first bushing 5 and the contact 10 with the contact head contact the other side of angle α (i.e., the side that forms an angle α with the bottom surface a). At this time, the front end of the contact rod 4 also touches the other side of angle α (i.e., the side that forms an angle α with the bottom surface a) at a vertical distance h above the first bushing 5. The reading of the indicator changes. Remember the reading of the indicator and remove the standard block. Then place the blade to be measured on surface A of the measuring device and repeat the above method of measuring the standard block. Observe the indicator and calculate the change in the reading of the indicator. The change in the blade base angle within the height difference h is calculated using the lever ratio of lever 8 (the ratio of the vertical distance from the contact point of the second end of the contact rod 4 to the first contact point of lever 8 to the shaft of lever 8 to the vertical distance from the contact point of the indicator to the second contact point of lever 8 to the shaft of lever 8) and the change in the indicator (this is a quantitative judgment, but a qualitative judgment can also be made, i.e., simply compare whether the changes in the indicator readings fall within the displacement range determined by the maximum and minimum base angles), thereby determining whether the product is qualified.

[0040] The comparative measurement method of this invention is very simple, convenient and reliable to operate on the production site, and can quickly determine whether the product is qualified or not, thus achieving the measurement purpose and greatly improving work efficiency.

[0041] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A device for measuring the blade base angle, characterized in that: include, The base (1) has a horizontal mounting surface and a blade mounting surface A at an angle α to the direction perpendicular to the horizontal mounting surface; Lever (8), which is arranged parallel to the horizontal mounting surface, and the lever (8) forms a rotating pair with the base (1) through a rotating shaft perpendicular to the horizontal mounting surface. The lever (8) includes a first contact end and a second contact end. The first bushing (5) and the contact (10) are located in the same plane and are arranged parallel to each other. The plane where the first bushing (5) and the contact (10) are located is parallel to the horizontal mounting surface. The ends of the first bushing (5) and the contact (10) are coplanar in a plane perpendicular to the horizontal mounting surface. The contact rod (4) is arranged parallel to the horizontal mounting surface and slidably connected inside the first bushing (5). The contact rod (4) includes a first end that contacts the blade and a second end that contacts the first contact end of the lever (8). The vertical distance from the first end of the contact rod (4) to the plane where the first bushing (5) and the contact (10) are located is h. The measuring end of the indicator contacts the second contact end of the lever (8) and measures the displacement of the second contact end; Spring (11), one end of which is in close contact with lever (8), and the close contact position is located between the pivot of lever (8) and the second contact end. The direction of the force torque of spring (11) on lever (8) is opposite to the direction of the force torque of contact rod (4) on lever (8). A limiting rod, one end of which points to the lever (8) and there is a gap between the limiting rod and the lever (8). When the lever (8) contacts the limiting rod, the direction of the torque of the limiting rod on the lever (8) is opposite to the direction of the torque of the spring (11) on the lever (8). A standard block, comprising a base surface a and an inclined surface at an angle α to the base surface a, wherein both the base surface a and the inclined surface are planes.

2. The blade base angle measuring device according to claim 1, characterized in that: The blade mounting surface A includes multiple protrusions, with grooves between adjacent protrusions, and the upper surfaces of the multiple protrusions are coplanar.

3. The blade base angle measuring device according to claim 1, characterized in that: It also includes a support block (2), which is detachably connected to the horizontal mounting surface of the base (1). The support block (2) has a lever shaft hole and a bushing mounting hole, and the first bushing (5) is inserted into the bushing mounting hole.

4. The blade base angle measuring device according to claim 3, characterized in that: The support block (2) is connected to the horizontal mounting surface of the base (1) by a cylindrical pin (17) and screws.

5. The blade base angle measuring device according to claim 3, characterized in that: The lever (8) is rotatably connected to the lever shaft hole through a shaft consisting of a coaxially assembled pin (3) and a second bushing (6). The lever (8) is connected to the pin (3) by a first screw (7).

6. The blade base angle measuring device according to claim 3, characterized in that: It also includes a contact rod limiting groove, a limiting screw hole and a seventh screw (19). The contact rod limiting groove is located on the contact rod (4) and extends along the axial direction of the contact rod (4). The limiting screw hole passes through both the support block (2) and the first bushing (5). The seventh screw (19) is connected in the limiting screw hole and its end is located in the contact rod limiting groove.

7. The blade base angle measuring device according to claim 3, characterized in that: It also includes a cover plate (9) which is detachably mounted above the support block (2) such that at least a portion of the support block (2) is located inside the cover plate (9), the spring (11) is mounted on the side of the support block (2) by a second screw (12), the limiting rod is mounted on the side of the support block (2) opposite to the spring (11), and the indicator is mounted on the same side of the support block (2) as the spring (11) by a third bushing (13).

8. The measuring device for the blade base angle according to claim 1, characterized in that: The first bushing (5) and the contact (10) are coplanar and have a ball-shaped end. The first and second ends of the contact rod (4) are both ball-shaped.

9. The blade base angle measuring device according to claim 1, characterized in that: The first contact end and the second contact end of the lever (8) are two mutually perpendicular planes, wherein the line of intersection of the plane where the first contact end is located and the plane where the second contact end is located coincides with the axis of rotation of the lever (8).

10. A method for measuring the blade base angle, characterized in that: The measuring device described in claim 1 is used, and the process includes the following steps: Step 1: Place the bottom surface a of the standard block close to the blade mounting surface A of the measuring device, so that the coplanar ends of the first bushing (5) and the contact (10) and the first end of the contact rod (4) simultaneously contact the inclined surface on the standard block. Step 2: Read the reading on the indicator, remove the standard block, and reset the indicator reading to zero; Step 3: Place the blade to be measured on the blade mounting surface A, so that the ends of the first bushing (5) and the contact (10) that are coplanar, and the first end of the contact rod (4) make contact with the surface of the blade to be measured at an angle α with the blade mounting surface A at three points simultaneously. Step 4: Read the reading on the indicator again, calculate the difference between the reading and the reading in Step 2, and convert the tolerance range of the blade bottom angle α into the displacement range by combining the displacement amplification ratio of the first and second contact ends on the lever (8). Then compare it with the reading difference of the indicator. If the reading difference of the indicator falls within the displacement range corresponding to the tolerance range of the blade bottom angle α, the bottom angle is qualified. If the reading difference of the indicator falls outside the displacement range corresponding to the tolerance range of the blade bottom angle α, the bottom angle is unqualified.

Images