A tooling and method for measuring the angle of a blade rocker arm

Abstract

This invention discloses a fixture and method for measuring the angle of a blade rocker arm. The fixture includes a base plate, a rotating support, a rotating shaft, a rotating lever, a right support, a sliding block, a slide block, a left support, a top pin, a left pressure block, a positioning pin, a right pressure block, a hinge bolt, a retaining sleeve, a threaded block, and a connector. The circular groove formed by the right support, left support, left pressure block, and right pressure block positions and presses the left and right journals of the blade, with the end face of the right support abutting the right end face of the blade's shaft. The top pin presses against the left end face of the blade's shaft, and the first positioning pin positions the rocker arm hole, achieving complete constraint positioning of the blade. Two dial indicators are then installed on the slide block to measure the deviation of the blade's profile points after zeroing the indicators using the blade's zeroing standard. The angle deviation is calculated by the difference between the readings of the upper and lower dial indicators. This invention solves the problems of difficult rocker arm blade angle measurement and low efficiency of coordinate measuring machine (CMM) detection in mass production.

Description

Technical Field

[0001] This invention belongs to the field of measurement technology, specifically relating to a blade rocker arm angle measuring fixture and measurement method. Background Technology

[0002] Rocker arm blades are an important component of aero engines, and their structure is as follows: Figure 1 As shown, the blade and the rocker arm are connected by a pin. The rocker arm angle α affects the installation angle of the blade inside the engine, which in turn affects the size of the intake window and is of great significance for the control of the engine's inlet airflow. As the rocker arm blade angle is a critical dimension, the actual value of the rocker arm installation angle needs to be detected and recorded during the machining of the rocker arm mounting hole and trial assembly. Figure 1 In the diagram below, the section E corresponding to the rocker arm angle α refers to... Figure 1 The cross section in the above figure is located at a distance L from the end face of the blade rocker arm shaft.

[0003] Given the lack of dedicated measuring tools, coordinate measuring machines are currently used for measurement, which results in low efficiency. With the mass production of multiple engine models, this efficiency has severely hampered the delivery of product parts. Therefore, it is urgent to improve existing measurement methods or design new measuring tools. Summary of the Invention

[0004] In view of the problems described in the background art, the present invention aims to provide a tooling and method for measuring the angle of a blade rocker arm, thereby solving the problems of difficulty in measuring the angle of the rocker arm blade and low efficiency of coordinate measuring machine (CMM) detection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A blade rocker arm angle measuring fixture includes:

[0007] The right support and the left support each have a semi-circular groove machined at their upper ends. The semi-circular groove is used to support the journals at both ends of the blade, thereby forming a reference for measuring the blade axis. One surface of the right support forms a clamping surface that contacts the end face of the blade rocker arm. A top pin is movably mounted on the left support. The end of the top pin is used to clamp the non-rocker arm end of the blade. The surface of the right support and the top pin together restrict the axial movement of the blade.

[0008] The right pressure block and the left pressure block each have a semi-circular groove machined at their lower ends. The right pressure block is paired with the right support to press the journal at one end of the blade, and the left pressure block is paired with the left support to press the journal at the other end of the blade, thereby fixing the axial position of the blade.

[0009] A rotating support is located on the same side of the right and left supports. A rotating lever is rotatably connected to the rotating support via a rotating shaft. The rotating lever includes a first arm, a second arm, and a third arm. The first arm is connected to the blade rocker arm via a first positioning pin. The second arm is connected to the rotating support via a second positioning pin. The third arm is connected to one end of a spring, and the other end of the spring is fixed. The three arms form three lever arms centered on the rotating shaft on the rotating support in the rotation plane of the rotating lever, thereby restricting the blade from rotating around its own axis.

[0010] The slide block and the slide base are arranged in parallel and spaced apart to form a slide rail. The slide base is slidably connected to the slide rail and the sliding direction is perpendicular to the axis of the blade. The slide block is set between the right support and the left support. Two dial indicators are installed on the slide base, one above the other.

[0011] Furthermore, the right support, left support, rotary support, and slide are fixed to the base plate.

[0012] Furthermore, the left support is slidably connected to the top pin, the end of the top pin is in contact with the retaining sleeve, the top pin presses against the non-rocker arm end of the blade through the retaining sleeve, and a spring is also sleeved on the top pin, with the spring located between the retaining sleeve and the surface of the left support.

[0013] Furthermore, the third arm of the rotating lever is connected to one end of the spring, and the other end of the spring is fixed to the right support.

[0014] Furthermore, a T-shaped slide rail is formed between the two slide blocks.

[0015] As one solution, the blade rocker arm angle measuring fixture also includes a threaded block, a connector, and a knurled head screw. The threaded block is fixed on the base plate and has a threaded hole. An adjusting screw is installed in the threaded hole, and the end of the adjusting screw is a T-shaped head. The connector is threaded to the slide and has a T-shaped groove on its surface. The T-shaped head of the adjusting screw is installed in the T-shaped groove of the connector, and the knurled head screw is installed on the slide.

[0016] As one option, the two dial indicators are mounted on a slide via bushings, and the slide is also provided with knurled flat-head screws for fixing the positions of the two dial indicators, with the ends of the knurled flat-head screws pressed against the surface of the bushings.

[0017] As one option, the right pressure block and the left pressure block are connected to the right support and the left support respectively by hinge bolts.

[0018] A method for measuring the angle of a blade rocker arm, using the aforementioned blade rocker arm angle measuring fixture, includes the following steps:

[0019] S1. Take the blade zeroing standard part and install it on the blade rocker arm angle measuring fixture, so that the journal at the rocker arm end and the journal at the non-rocker arm end are respectively placed in the semi-circular grooves on the right support and the left support. Use the semi-circular grooves on the right pressure block and the left pressure block to fix the journal of the blade, thereby fixing the axis of the blade.

[0020] S2, insert the first positioning pin to connect the rocker arm of the rotating lever and the blade, and insert the second positioning pin to connect the rotating lever and the rotating support, thereby restricting the blade from rotating around its own axis;

[0021] S3, rotate and move the top pin to press against the non-rocker arm end of the blade until the shaft end face of the blade rocker arm end is pressed against the surface of the right support, thus completing the displacement restriction in the direction of the blade axis;

[0022] S4, move the slide block to make the two dial indicators contact and press against the blade surface, fix the position of the slide block, zero the readings of the two dial indicators, and then remove the blade zeroing standard part.

[0023] S5. Fix the blade to be measured according to the installation method in S1 to S3. Then move the slide again so that the two dial indicators contact and press against the surface of the blade to be measured. Read the readings of the two dial indicators, take the difference between the two readings, look up the theoretical angle deviation table, and obtain the actual deviation value of the blade rocker arm relative to the theoretical angle, thus obtaining the actual value of the blade rocker arm angle.

[0024] Compared with existing technologies, this invention uses a dedicated measuring fixture to measure the angle of the rocker arm blades. Compared with existing coordinate measuring machines (CMMs), it is simpler to operate, more efficient, has higher measurement accuracy, meets requirements, and is more stable. In mass production, it can efficiently and quickly measure the angle dimensions of the rocker arm blades without the need for specialized equipment like CMMs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the rocker arm blade structure;

[0026] Figure 2 This is the front view of the present invention;

[0027] Figure 3 This is a top view of the present invention;

[0028] Figure 4 It is the AA section view of the front view;

[0029] Figure 5 It is the BB section view of the front view;

[0030] Figure 6 It is a CC section view of the main view;

[0031] Figure 7 It is the DD section view of the main view;

[0032] Figure 8 It is the EE section view of the top view;

[0033] Figure 9 This is a three-dimensional isometric view of the present invention;

[0034] Figure 10 This is a table showing the theoretical angle deviations.

[0035] In the diagram, 1-base plate, 2-rotating support, 3-rotating shaft, 4-rotating lever, 5-right support, 6-sliding block, 7-sliding seat, 8-left support, 9-top pin, 10-left pressure block, 11-first positioning pin, 12-right pressure block, 13-swivel bolt, 14-stop sleeve, 15-threaded block, 16-connector, 20-second positioning pin, 25-knurled flat head screw, 28-knurled high head screw, 37-bushing. Detailed Implementation

[0036] 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.

[0037] like Figures 2-9 As shown, this invention provides a blade rocker arm angle measuring fixture, which includes a base plate 1, a rotating support 2, a rotating shaft 3, a rotating lever 4, a right support 5, a sliding block 6, a sliding seat 7, a left support 8, a top pin 9, a left pressure block 10, a positioning pin 11, a right pressure block 12, a hinge bolt 13, a retaining sleeve 14, a threaded block 15, a connector 16, and other standard parts (such as knurled flat head screws 25 and knurled high head screws 28).

[0038] The base plate 1 of the tooling serves as the main support for the tooling, connecting and supporting the other tooling parts. For example... Figure 4 , Figure 5 As shown, the right support 5 and left support 8 have semi-circular grooves corresponding to the size of the journals at both ends of the rocker arm blade, used to support and position the journals at both ends of the blade, forming a reference for axis measurement. The journals at both ends of the blade are pressed together by the left pressure block 10 and right pressure block 12, which also have semi-circular grooves, to fix the blade axis. At this point, if the blade needs to be fully positioned, movement along the axis and rotation along the axial direction also need to be restricted. Figure 2As shown, the right side of the blade's shaft end face is pressed against the surface of the right support 5, while the left side is secured by a top pin 9, a spring, and a retaining sleeve 14, thus limiting axial movement. The top pin 9 and the left support 8 have a standard clearance hole shaft fit. The blade is disassembled by pulling the top pin 9 to the left, and the blade is secured by the spring during assembly. The retaining sleeve 14 is a metal sleeve that is installed on the shaft at the non-rocker end of the blade, forming a shoulder to easily hold the spring. Since making it integral with the shaft at the non-rocker end of the blade would affect assembly, it is made as a separate metal sleeve and installed and fixed on the shaft at the non-rocker end of the blade.

[0039] like Figure 2 , Figure 6 As shown, the end of the blade rocker arm has a small hole for a universal bearing. The universal bearing, which is inserted into the hole by the first positioning pin 11, connects the blade rocker arm to the rotating lever 4 (the shape of the rotating lever 4 is as shown). Figure 6 (There are three arms around the rotating shaft 3). The rotating lever 4 and the rotating support 2 can be fixed in the angular direction by the second positioning pin 20, thereby realizing the restriction of the axial rotation of the blade. The rotating lever 4 is connected to the right support 5 by a spring, providing a force to eliminate the gap between the three arms of the rotating lever 4 and the fit between the rotating lever 4 and the rotating support 2. At this point, the complete constraint and positioning of the blade is completed.

[0040] Figure 4 and Figure 5 The markings indicate the use of a measuring bar. This measuring bar is used to check whether the semi-circular grooves of the right support 5 and the left support 8 are parallel to the bottom surface and whether the left and right sides form an axial reference when manufacturing the blade rocker arm angle measuring fixture. It also checks the coaxiality.

[0041] like Figure 2 , Figure 3 , Figure 8 As shown, two sliding blocks 6 are installed on the base plate 1, forming an inverted T-shaped slide rail. A sliding seat 7 is installed within it, allowing it to move perpendicular to the blade axis along the slide rail direction. Figure 7 As shown, the slide 7 has two holes, each containing a bushing 37. Two dial indicators mounted in these holes are secured with knurled flat-head screws 25. The positions of the rocker arm blade cross-sections measured by the two dial indicators on the slide 7 correspond precisely to... Figure 1 The position of section E in the diagram, or the section located at a distance L from the rocker arm end.

[0042] like Figure 7The diagram illustrates the adjustment method of the slide block 7 within the slide block 6, achieved through a threaded block 15, a connector 16, and a knurled head screw 28. The threaded block 15 is fixed to the base plate 1 and has a threaded hole. An adjusting screw is installed in the threaded hole, with a T-shaped head at the end. The connector 16 is threadedly connected to the slide block 7, and its surface has a T-shaped groove. The T-shaped head of the adjusting screw is installed in the T-shaped groove of the connector 16. The knurled head screw 28 is installed on the slide block 7. The adjusting screw can push or pull the slide block 7 forward or backward, and the threaded connection allows for fine-tuning. The connector 16 can hold the head of the adjusting screw, and the rotation of the adjusting screw 23 causes the connector 16 to move together.

[0043] When measuring the angle, first accurately install and position the blade zeroing standard as described above. Push the slide 7, which houses the two dial indicators, close to the blade surface, so that the two dial indicators contact the blade surface and press down on the indicators by approximately 0.5 mm. Then, secure the slide 7 to the base plate 1 by tightening the knurled head screws 28, and zero the dials of the two dial indicators. Remove the blade zeroing standard, install the blade to be measured, and push the slide 7 again to press the two dial indicators firmly against the blade surface. Read the readings of the upper and lower dial indicators and calculate the difference between the two readings. Then, check the... Figure 10 The table showing the theoretical angle deviation corresponds to the actual deviation of the blade rocker arm relative to the theoretical angle. This allows us to derive the actual blade rocker arm angle, which is obtained by reading the difference between the two dial gauge readings and then querying the table. Figure 10 The values ​​in the table are converted to deviation angles. The deviation angle is then added to the calibration angle of the blade zeroing standard (for example, the standard is theoretically 10°, but there is a tolerance, so the calibration may be 10°5′). The deviation angle + calibration angle 10°5′ is the actual angle of the blade being measured.

[0044] The angle measuring fixture of this invention uses a circular groove formed by the right support 5, left support 8, left pressure block 10, and right pressure block 12 to position and press the left and right journals of the blade. The end face of the right support 5 is attached to the right end face of the blade, and the first positioning pin 11 positions the rocker arm hole, thus achieving complete constraint positioning of the blade. Then, two dial indicators are installed on the slide 7 to measure the deviation of the blade profile point after the dial indicators are zeroed with the blade zeroing standard. The angle deviation value is calculated by the difference between the readings of the upper and lower dial indicators.

[0045] 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 blade rocker arm angle measuring fixture, characterized in that, include: The right support (5) and the left support (8) each have a semi-circular groove machined at their upper ends. The semi-circular groove is used to support the journals at both ends of the blade, thereby forming a blade axis measurement reference. One surface of the right support (5) forms a clamping surface that contacts the end face of the blade rocker arm. A top pin (9) is movably installed on the left support (8). The end of the top pin (9) is used to clamp the non-rocker arm end of the blade. The surface of the right support (5) and the top pin (9) together restrict the axial movement of the blade. The right pressure block (12) and the left pressure block (10) each have a semi-circular groove at their lower ends. The right pressure block (12) is paired with the right support (5) to press the journal at one end of the blade, and the left pressure block (10) is paired with the left support (8) to press the journal at the other end of the blade, thereby fixing the axial position of the blade. Rotary support (2), the rotary support (2) is located on the same side of the right support (5) and the left support (8). Rotary support (2) is rotatably connected to rotating lever (4) via rotating shaft (3). Rotary lever (4) includes a first arm, a second arm and a third arm. The first arm is connected to the blade rocker arm via a first positioning pin (11). The second arm is connected to the rotary support (2) via a second positioning pin (20). The third arm is connected to one end of a spring. The other end of the spring is fixed. The three arms form three lever arms centered on the rotating shaft (3) on the rotary support (2) in the rotation plane of the rotating lever (4), thereby restricting the blade from rotating around its own axis. The two slide blocks (6) are arranged in parallel and spaced apart to form a slide rail. The slide block (7) is slidably connected to the slide rail and the sliding direction is perpendicular to the axis of the blade. The slide block (6) is set between the right support (5) and the left support (8). Two dial indicators are installed on the slide block (7) and distributed on the upper and lower sides. The threaded block (15), the connector (16), and the knurled head screw (28) are fixed on the base plate (1). The threaded block (15) has a threaded hole, and an adjusting screw is installed in the threaded hole. The end of the adjusting screw is a T-shaped head. The connector (16) is connected to the slide (7) by a thread, and the surface of the connector (16) has a T-shaped groove. The T-shaped head of the adjusting screw is installed in the T-shaped groove of the connector (16), and the knurled head screw (28) is installed on the slide (7). The right support (5), left support (8), rotating support (2) and slide (7) are fixed on the base plate (1); The left support (8) is slidably connected to the top pin (9). The end of the top pin (9) is in contact with the retaining sleeve (14). The top pin (9) presses against the non-rocker end of the blade through the retaining sleeve (14). A spring is also sleeved on the top pin (9). The spring is between the retaining sleeve (14) and the surface of the left support (8).

2. The blade rocker arm angle measuring fixture according to claim 1, characterized in that: The third arm of the rotating lever (4) is connected to one end of the spring, and the other end of the spring is fixed on the right support (5).

3. The blade rocker arm angle measuring fixture according to claim 1, characterized in that: A T-shaped slide rail is formed between the two slide blocks (6).

4. The blade rocker arm angle measuring fixture according to claim 1, characterized in that: The two dial indicators are mounted on the slide (7) via bushings (37), and the slide (7) is also provided with knurled flat head screws (25) for fixing the position of the two dial indicators. The ends of the knurled flat head screws (25) are pressed against the surface of the bushing (37).

5. The blade rocker arm angle measuring fixture according to claim 1, characterized in that: The right pressure block (12) and the left pressure block (10) are connected to the right support (5) and the left support (8) respectively by hinge bolts (13).

6. A method for measuring the angle of a blade rocker arm, characterized in that: The blade rocker arm angle measuring fixture described in claim 1 is used, and includes the following steps: S1, take the blade zeroing standard part and install it on the blade rocker arm angle measuring fixture, so that the journal at the rocker arm end and the journal at the non-rocker arm end are respectively placed in the semi-circular grooves on the right support (5) and the left support (8), and use the semi-circular grooves on the right pressure block (12) and the left pressure block (10) to fix the journal of the blade, thereby fixing the axis of the blade. S2, insert the first positioning pin (11) to connect the rotating lever (4) and the blade rocker arm, insert the second positioning pin (20) to connect the rotating lever (4) and the rotating support (2), thereby restricting the blade from rotating around its own axis; S3, rotate and move the top pin (9) to press against the non-rocker end of the blade until the shaft end face of the blade rocker end is pressed against the surface of the right support (5), thus completing the displacement restriction in the direction of the blade axis; S4, move the slide (7) so that the two dial indicators contact and press against the blade surface, fix the position of the slide (7), zero the readings of the two dial indicators, and then remove the blade zeroing standard. S5, fix the blade to be measured according to the installation method in S1 to S3, and then move the slide (7) again so that the two dial gauges contact and press against the surface of the blade to be measured. Read the readings of the two dial gauges, take the difference between the two readings, look up the theoretical angle deviation table, and obtain the actual deviation value of the blade rocker arm relative to the theoretical angle, thereby obtaining the actual value of the blade rocker arm angle.

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