Blade rocker arm angle measuring tool and method

Abstract

The invention discloses a blade rocker arm angle measuring tool and method. The tool comprises a bottom plate, a rotating support, a rotating shaft, a rotating lever, a right support, a sliding groove block, a sliding seat, a left support, a lifting pin, a left pressing block, a positioning plug pin, a right pressing block, an eyelet bolt, a spacer sleeve, a threaded block and a connector. A left shaft neck and a right shaft neck of the blade are positioned and pressed through a circular groove formed by the right support, the left support, the left pressing block and the right pressing block, the end face of the right support is attached to the right shaft end face of the blade, the lifting pin abuts against the left shaft end face of the blade, a rocker arm hole is positioned through the first positioning plug pin, and complete restraining and positioning of the blade are achieved. And then two dial indicators are installed on the sliding seat, so that the profile point deviation of the to-be-measured blade is measured after the zero setting of the blade zero setting standard component, and the angle deviation value is calculated through the reading difference value of the upper dial indicator and the lower dial indicator. The problems that the angle of the rocker arm blade is difficult to measure during batch production and the three-coordinate detection efficiency is low are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement, and in particular relates to a blade rocker arm angle measurement tool and a measurement method. Background Art

[0002] The rocker blade is an important component of an aircraft engine. Figure 1 As shown in the figure, the blade and the handle 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 to the control of the engine inlet air flow. The rocker arm blade angle is a key dimension. During the processing of the rocker arm mounting hole and trial assembly, the rocker arm installation angle needs to be tested and the actual angle value recorded. Figure 1 The cross section E corresponding to the rocker arm angle α in the figure below refers to Figure 1 The cross section in the above figure is at a distance L from the end face of the blade rocker arm shaft.

[0003] Considering the lack of special measuring tools, three-coordinate measurement is currently mostly used, and the detection efficiency is too low. In the context of mass production of multiple types of engines, its detection efficiency has seriously restricted the delivery of product parts. Therefore, it is urgent to improve the original measurement method or design new measurement tools for measurement. Summary of the invention

[0004] In view of the problems described in the background technology, the present invention aims to provide a blade rocker arm angle measurement tool and method to solve the problems of difficulty in rocker arm blade angle measurement and low efficiency of three-coordinate detection.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A blade rocker arm angle measuring tool, comprising:

[0007] A right support and a left support, wherein the upper ends of the right support and the left support are respectively processed with a semicircular groove, the semicircular groove is used to support the journals at both ends of the blade, thereby forming a blade axis measurement reference, a surface of the right support forms a tightening surface that contacts the shaft end surface of the blade rocker arm end, a push pin is movably installed on the left support, the end of the push pin is used to tighten the non-rocker arm end of the blade, and the surface of the right support and the push pin jointly limit the axial movement of the blade;

[0008] A right pressing block and a left pressing block, wherein the lower ends of the right pressing block and the left pressing block are respectively processed with a semicircular groove, wherein the right pressing block is matched with the right support to press the journal at one end of the blade, and the left pressing block is matched 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, wherein the rotating support is located on the same side of the right support and the left support, and the rotating support is rotatably connected to a rotating lever via a rotating shaft, and the rotating lever comprises a first arm, a second arm and a third arm, the first arm is connected to a blade rocker arm via a first positioning latch, the second arm is connected to the rotating support via a second positioning latch, the third arm is connected to one end of a spring, and the other end of the spring is fixed, and the three arms form three force arms centered on the rotating shaft on the rotating support in a rotating plane of the rotating lever, thereby limiting the rotation of the blade around its own axis;

[0010] A slide block and a slide seat, wherein two slide blocks are arranged in parallel and at intervals to form a slide rail, the slide seat is slidably connected to the slide rail, and the sliding direction is perpendicular to the axis of the blade, the slide block is arranged between the right support and the left support, and two dial indicators distributed upper and lower are installed on the slide seat.

[0011] Furthermore, the right support, the left support, the rotating support and the sliding seat are fixed on the bottom plate.

[0012] Furthermore, the left support is slidably connected to the push pin, the end of the push pin is fitted with the stop sleeve, the push pin is pressed against the non-rocker arm end of the blade through the stop sleeve, and a spring is also sleeved on the push pin, and the spring is between the stop 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 on the right support.

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

[0015] As a solution, the blade rocker arm angle measuring tool also includes a threaded block, a connecting head and a knurled high head screw. The threaded block is fixed on the base plate. A threaded hole is opened on the threaded block. An adjusting screw is installed in the threaded hole. The end of the adjusting screw is a T-shaped head. The connecting head is connected to the sliding seat by a thread, and a T-shaped slot is opened on the surface of the connecting head. The T-shaped head of the adjusting screw is installed in the T-shaped slot of the connecting head, and the knurled high head screw is installed on the sliding seat.

[0016] As a solution, the two dial indicators are installed on the slide via a bushing, and the slide is also provided with a knurled flat head screw for fixing the positions of the two dial indicators, and the end of the knurled flat head screw is pressed against the surface of the bushing.

[0017] As a solution, the right pressure block and the left pressure block are respectively connected to the right support and the left support through movable bolts.

[0018] A blade rocker arm angle measurement method adopts the blade rocker arm angle measurement tool and comprises 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 shaft journal of the blade rocker arm end and the shaft journal of the non-rocker arm end are respectively placed in the semicircular grooves on the right support and the left support, and the shaft journal of the blade is fixed by the semicircular grooves on the right pressure block and the left pressure block, thereby fixing the axis of the blade;

[0020] S2, inserting a first positioning pin to connect the rotating lever and the rocker arm of the blade, and inserting a second positioning pin to connect the rotating lever and the rotating support, thereby limiting the rotation of the blade around its own axis;

[0021] S3, rotating and moving the ejector pin to press against the non-rocker arm end of the blade until the axial end surface of the rocker arm end of the blade is in close contact with the surface of the right support, thus completing the displacement limitation in the axial direction of the blade;

[0022] S4, move the slide so that the two dial indicators contact and press the blade surface, fix the position of the slide, adjust the readings of the two dial indicators to zero, and then remove the blade zeroing standard parts;

[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 the surface of the blade to be measured, read the readings of the two dial indicators, take the difference between the two readings, query the theoretical angle deviation correspondence 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.

[0024] Compared with the prior art, the present invention uses a special measuring tool to complete the rocker blade angle measurement. Compared with the existing three-coordinate detection method, the present invention is simple to operate, has high detection efficiency, meets the measurement accuracy requirements, and has good stability. In the case of mass production, the rocker blade angle size can be efficiently and quickly detected without the need for special equipment such as three-coordinate. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0030] Figure 6 It is the 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] Fig. 9 is a three-dimensional axonometric diagram of the present invention;

[0034] Fig.10 It is the corresponding table of theoretical angle deviation;

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

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0037] like Figure 2 to Figure 9 As shown, a blade rocker arm angle measuring tool designed by the present invention includes a base plate 1, a rotating support 2, a rotating shaft 3, a rotating lever 4, a right support 5, a slide block 6, a slide 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 movable bolt 13, a stop sleeve 14, a threaded block 15, a connector 16 and other standard parts (such as a knurled flat head screw 25 and a knurled high head screw 28).

[0038] The bottom plate 1 of the tooling serves as the main support of the tooling, connecting and supporting the other tooling parts. Figure 4 , Figure 5 As shown, the right support 5 and the left support 8 have semicircular grooves corresponding to the size of the shaft necks at both ends of the rocker blade, which are used to support and position the shaft necks at both ends of the blade to form an axis measurement reference. The left pressure block 10 and the right pressure block 12, which also have semicircular grooves, press the shaft necks at both ends of the blade to fix the blade axis. At this time, if the blade needs to be completely positioned, it is also necessary to limit the movement along the axis direction and the rotation along the axial direction. Figure 2As shown, the right side of the blade shaft end face is pressed against the surface of the right support 5, while the left side is tightened by the push pin 9, spring and stop sleeve 14, so as to achieve axial movement restriction. The push pin 9 and the left support 8 are matched with a common clearance hole shaft. The blade is disassembled by pulling the push pin 9 to the left, and the blade is tightened by the spring during assembly. The stop sleeve 14 is a metal sleeve, which is installed on the shaft of the non-rocker arm end of the blade to form a shoulder to facilitate the clamping of the spring. Since it will affect the assembly if it is made into one with the shaft of the non-rocker arm end of the blade, it is made into a separate metal sleeve and installed on the shaft of the non-rocker arm end of the blade and fixed.

[0039] like Figure 2 , Figure 6 As shown, the end of the blade rocker arm has a small hole with a universal bearing installed, and the blade rocker arm is connected to the rotating lever 4 (the shape of the rotating lever 4 is as shown in FIG. Figure 6 , there are three arms around the rotating shaft 3), the rotating lever 4 and the rotating support 2 can be fixed at an angle by the second positioning pin 20, so as to realize the axial rotation restriction of the blade, and the rotating lever 4 is connected to the right support 5 through a spring, providing a force to eliminate the matching gap between the connection of the three arms of the rotating lever 4 and the rotating lever 4 and the rotating support 2. At this point, the complete constraint positioning of the blade is completed.

[0040] Figure 4 and Figure 5 A measuring rod is marked in the figure. The function of the measuring rod is to check whether the semicircular grooves of the right support 5 and the left support 8 are parallel to the bottom surface and whether the left and right axes form an axis reference when manufacturing the blade rocker arm angle measurement tooling, and to check the coaxiality at the same time.

[0041] like Figure 2 , Figure 3 , Figure 8 As shown, two slide blocks 6 are installed on the bottom plate 1 to form an inverted T-shaped slide rail, in which the slide seat 7 is installed and can move along the slide rail in a direction perpendicular to the blade axis. Figure 7 As shown, there are two holes on the slide 7, in which bushings 37 are installed, and two dial indicators installed in the holes can be locked by knurled flat head screws 25. The cross-sectional position of the rocker blade measured by the two dial indicators on the slide 7 corresponds exactly to Figure 1 The E section or the section position from the rocker arm end L.

[0042] like Figure 7As shown, the adjustment method of the slide 7 in the slide block 6 is shown, that is, it is achieved through the threaded block 15, the connector 16 and the knurled high head screw 28. The threaded block 15 is fixed on the base plate 1, and a threaded hole is opened on the threaded block 15. 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 through a thread, and a T-shaped slot is opened on the surface of the connector 16. The T-shaped head of the adjusting screw is installed in the T-shaped slot of the connector 16, and the knurled high head screw 28 is installed on the slide 7. The slide 7 can be pushed out or pulled in by the adjusting screw, and the thread method can achieve fine adjustment. The connector 16 can clamp the head of the adjusting screw, and the adjusting screw 23 can drive the connector 16 to move together when it rotates.

[0043] When measuring the angle, first install and position the blade zeroing standard accurately as described above, push the slide 7 with two dial indicators installed close to the blade surface, so that the two dial indicators touch the blade surface and press about 0.5mm. Then fix the slide 7 on the base plate 1 by tightening the knurled high head screw 28, and adjust the dials of the two dial indicators to zero. Remove the blade zeroing standard, install the blade part to be measured, push the slide 7 again so that the two dial indicators press the blade surface, read the readings of the upper and lower dial indicators and calculate the difference between the two readings, and query Fig.10 The theoretical angle deviation corresponding table shown in the figure can be used to 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, that is, reading the difference between the readings of the two dial indicators, and querying Fig.10 The deviation angle is converted into the table. The deviation angle is added to the calibration angle of the blade zeroing standard (for example, the standard is theoretically 10°, but there is a tolerance in practice, 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 tool of the present invention positions and presses the left and right journals of the blade through the circular grooves formed by the right support 5, the left support 8, the left pressure block 10, and the right pressure block 12, and the end face of the right support 5 is abutted against the right shaft end face of the blade, and the first positioning pin 11 positions the rocker arm hole, so as to realize the complete constraint positioning of the blade. Then two dial indicators are installed on the slide 7 to measure the deviation of the profile point of the blade to be measured after the blade zeroing standard part is zeroed, and the angle deviation value is calculated by the difference between the readings of the upper and lower dial indicators.

[0045] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A blade rocker arm angle measuring tool, characterized in that: include: A right support (5) and a left support (8), wherein the upper ends of the right support (5) and the left support (8) are respectively processed with a semicircular groove, the semicircular groove is used to support the shaft necks at both ends of the blade, thereby forming a blade axis measurement reference, a surface of the right support (5) forms a tightening surface that contacts the shaft end surface of the blade rocker arm end, and a push pin (9) is movably installed on the left support (8), the end of the push pin (9) is used to tighten the non-rocker arm end of the blade, and the surface of the right support (5) and the push pin (9) jointly limit the axial movement of the blade; A right pressing block (12) and a left pressing block (10), wherein the lower ends of the right pressing block (12) and the left pressing block (10) are respectively processed with a semicircular groove, wherein the right pressing block (12) is matched with the right support (5) to press the shaft neck at one end of the blade, and the left pressing block (10) is matched with the left support (8) to press the shaft neck at the other end of the blade, thereby fixing the axial position of the blade; A rotating support (2), wherein the rotating support (2) is located on the same side of the right support (5) and the left support (8), and the rotating support (2) is rotatably connected to a rotating lever (4) via a rotating shaft (3), and the rotating lever (4) comprises a first arm, a second arm and a third arm, the first arm being connected to a blade rocker arm via a first positioning pin (11), the second arm being connected to the rotating support (2) via a second positioning pin (20), and the third arm being connected to one end of a spring, the other end of which is fixed, and the three arms forming three force arms centered on the rotating shaft (3) on the rotating support (2) in a rotating plane of the rotating lever (4), thereby limiting the rotation of the blade around its own axis; A slide block (6) and a slide seat (7), wherein two slide blocks (6) are arranged in parallel and at intervals to form a slide rail, and the slide seat (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 arranged between the right support (5) and the left support (8), and two dial indicators distributed upper and lower are installed on the slide seat (7).

2. The blade rocker arm angle measuring tool according to claim 1, characterized in that: The right support (5), the left support (8), the rotating support (2) and the sliding seat (7) are fixed on the bottom plate (1).

3. The blade rocker arm angle measuring tool according to claim 1, characterized in that: The left support (8) is slidably connected to the push pin (9), the end of the push pin (9) is in contact with the stop sleeve (14), the push pin (9) is pressed against the non-rocker arm end of the blade through the stop sleeve (14), and a spring is sleeved on the push pin (9), and the spring is between the stop sleeve (14) and the surface of the left support (8).

4. The blade rocker arm angle measuring tool according to claim 1, characterized in that: The third support 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).

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

6. The blade rocker arm angle measuring tool according to claim 2, characterized in that: It also comprises a threaded block (15), a connecting head (16) and a knurled high head screw (28), wherein the threaded block (15) is fixed on the base plate (1), a threaded hole is formed on the threaded block (15), an adjusting screw is installed in the threaded hole, the end of the adjusting screw is a T-shaped head, the connecting head (16) is connected to the slide seat (7) by means of threads, and a T-shaped slot is formed on the surface of the connecting head (16), the T-shaped head of the adjusting screw is installed in the T-shaped slot of the connecting head (16), and the knurled high head screw (28) is installed on the slide seat (7).

7. The blade rocker arm angle measuring tool according to claim 1, characterized in that: The two dial indicators are mounted on the slide seat (7) via a bushing (37), and the slide seat (7) is also provided with a knurled flat head screw (25) for fixing the positions of the two dial indicators, and the end of the knurled flat head screw (25) is pressed against the surface of the bushing (37).

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

9. A blade rocker arm angle measurement method, characterized in that: The blade rocker arm angle measuring tool according to claim 1 is used, and includes the following steps: S1, take the blade zero adjustment standard part and install it on the blade rocker arm angle measurement tooling, so that the shaft neck of the blade rocker arm end and the shaft neck of the non-rocker arm end are respectively placed in the semicircular grooves on the right support (5) and the left support (8), and the shaft neck of the blade is fixed by using the semicircular grooves on the right pressure block (12) and the left pressure block (10), thereby fixing the axis of the blade; S2, inserting a first positioning pin (11) to connect the rotating lever (4) and the rocker arm of the blade, and inserting a second positioning pin (20) to connect the rotating lever (4) and the rotating support (2), thereby limiting the rotation of the blade around its own axis; S3, rotating and moving the push pin (9) to press against the non-rocker arm end of the blade until the axial end surface of the rocker arm end of the blade is in close contact with the surface of the right support (5), thereby completing the displacement limitation in the axial direction of the blade; S4, move the slide (7) so that the two dial indicators contact and press against the surface of the blade, fix the position of the slide (7), adjust the readings of the two dial indicators to zero, and then remove the blade zeroing standard component; S5, fix the blade to be measured according to the installation method in S1 to S3, then move the slide (7) again so that the two dial indicators contact and press the surface of the blade to be measured, read the readings of the two dial indicators, and take two readings The difference is obtained by querying the theoretical angle deviation corresponding table to obtain the actual deviation value of the blade rocker arm relative to the theoretical angle. Thus, the actual value of the blade rocker arm angle is obtained.

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