Helicopter large ball hinge torque precision measuring device

Abstract

The application provides a helicopter large ball hinge torque precision measuring device, which comprises a base 6, a flange 5, a stand 4, a crossbeam 1, a height adjusting rod 15, a falling prevention pin 7, a torque rod 13, an annular track 12, a rubber sleeve 14, a dynamometer 11, an A hinge 8, a B hinge 10, a first fastening bolt 2, a second fastening bolt 9 and a third fastening bolt set 3, wherein the flange 5, the stand 4 and the base 6 are coaxial, the flange 5 is screwed on the base 6, the stand 4 is inserted into the flange 5, and the flange 5 and the stand 4 are matched with a small gap; the crossbeam 1 is arranged in a horizontal direction and has a cylindrical structure, the crossbeam 1 is inserted into a cylindrical horizontal hole of the stand 4 and matched with a gap; the height adjusting rod 15 is arranged in a vertical direction and has a cylindrical structure, the height adjusting rod 15 is inserted into a cylindrical vertical hole of the crossbeam 1, forms the A hinge and is matched with a small gap; a circular pin hole is arranged on the upper part of the height adjusting rod 15, and the falling prevention pin 7 is a T-shaped falling prevention pin which is inserted into the circular pin hole.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aviation, and particularly relates to a device for precisely measuring torque of a large ball hinge of a helicopter. BACKGROUND

[0002] A self-lubricating joint bearing, which is generally referred to as a large ball hinge in the industry, around which a helicopter automatic tilting device rotates, is a key core component of a rotor system and a control system of a helicopter. The large ball hinge is installed in a ball seat and has a hinge function with three degrees of freedom. A movable ring, a fixed ring and the ball seat together form a movable ring-fixed ring assembly, and the movable ring-fixed ring assembly rotates around the large ball hinge. The starting torque of the large ball hinge is a key index. If the starting torque is too large, the control will be poor or even stuck, which affects the flight safety of the helicopter. Therefore, it is crucial to accurately measure the starting torque of the large ball hinge.

[0003] There are two kinds of existing measuring tools and methods for the starting torque of the large ball hinge. One is a long handle with a cylindrical head type, which is inserted into the cylindrical cavity of the large ball hinge. A force gauge hooks a ring at the end of the long handle, and the force gauge is pulled vertically to the long handle to measure the starting force. The starting torque is obtained by calculation. The other is a short handle with a buckle type, which clamps the upper and lower ends of the cylindrical cavity of the large ball hinge. A force gauge hooks a ring at the end of the short handle, and the force gauge is pulled vertically to the short handle to measure the starting force. The starting torque is obtained by calculation. These two kinds of measuring tools and methods have a common defect, i.e. the force gauge is pulled vertically to the long / short handle to measure the starting force. In fact, it is difficult to realize that the pulling direction of the force gauge is always perpendicular to the handle by manual operation. According to the law of force decomposition and synthesis, this causes the reading of the force gauge to not reflect the true situation. SUMMARY

[0004] The present application provides a device for precisely measuring torque of a large ball hinge of a helicopter, which can obtain accurate starting torque by calculation.

[0005] Technical scheme: A device for precisely measuring torque of a large ball hinge of a helicopter, which comprises a base 6, a flange 5, a column 4, a cross beam 1, a height adjusting rod 15, a falling prevention pin 7, a torque rod 13, an annular track 12, a rubber sleeve 14, a force gauge 11, an A hinge 8, a B hinge 10, a first fastening bolt 2, a second fastening bolt 9 and a third fastening bolt 3, wherein:

[0006] Flange 5, column 4 and base 6 keep coaxial, flange 5 is screwed on base 6, column 4 is inserted into flange 5, flange 5 and column 4 adopt small gap fit;Beam 1 is arranged in horizontal direction, which is cylindrical structure, beam 1 is inserted into cylindrical horizontal hole of column 4, which adopts gap fit;Height adjusting rod 15 is arranged in vertical direction, which is cylindrical structure, height adjusting rod 15 is inserted into cylindrical vertical hole of beam 1, which constitutes A hinge 8, and adopts small gap fit;Circular pin hole is arranged on upper part of height adjusting rod 15, T-shaped anti-falling pin 7 is inserted into circular pin hole;Square slot is arranged on lower part of height adjusting rod 15, both sides of fork ear hole are arranged, the diameter of fork ear hole is consistent with the diameter of angle shaft hole at the front end of annular track 12, after being inserted into angle shaft of annular track 12, B hinge 10 is formed by cooperation, annular track 12 can rotate around B hinge 10;Moment rod 13 is thin-walled pipe, scale is arranged on upper part of moment rod 13, which is used for reading size data, large ball hinge fixing tool is connected to the bottom of moment rod 13, the upper part of moment rod 13 is inserted into fork ear space track in the middle of annular track 12, which is used for transmitting starting torque;Annular track 12 is circular arc structure, in the width direction, it includes three sub-track, the middle is fork ear space track, the two sides are dynamometer 11 track, the front end of annular track 12 is angle shaft and shaft hole;Rubber sleeve 14 is sleeved on moment rod 13, which slightly exceeds the position of annular track 12.

[0007] Further, the diameter of the circular pin hole is 0.2 times the diameter of the height adjusting rod 15, the diameter of the pin head is 2 times the diameter of the pin column, and the length of the pin column is 2 times the length of the pin head.

[0008] Further, the length of the pin head is consistent with the diameter of the height adjusting rod 15.

[0009] Further, the length of the moment rod 13 ranges from 50 to 200 cm.

[0010] Further, the annular track 12 is a 75° circular arc structure with a radius of 100 cm.

[0011] Further, the width of the three sub-tracks is 1.2 times the diameter of the moment rod 13.

[0012] Further, the distance between the center point of the small ring on the rubber sleeve 14 and the annular track 12 is consistent with the distance between the center point of the pull hook of the dynamometer 11 and the annular track 12.

[0013] Further, the diameter of the base 6 is greater than 20 cm, and the height of the flange 5 is greater than 10 cm.

[0014] The present application provides a helicopter large ball hinge torque precision measuring device, which has the following technical effects:

[0015] 1. The present application is designed according to accurate mathematical model, and finally the starting torque of the large ball hinge can be calculated according to the mathematical model.

[0016] 2. The design of the circular track 12 and a series of matching structures ensures that the pulling direction of the force gauge 11 is always perpendicular to the direction of the handle, and the reading of the force gauge 11 is the true magnitude of the starting force, thus guaranteeing the accuracy of the starting force.

[0017] 3. By using actual dimensional readings of the structure and calculating the lever arm using a mathematical model, the accuracy of the lever arm was ensured. This, in turn, guaranteed the accuracy of the final calculated starting torque of the large ball joint.

[0018] 4. This invention has a simple structure, is easy to disassemble and assemble, is easy to use, and can fundamentally improve accuracy, making it an excellent helicopter ground support device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a precision measuring device for large ball joint torque of a helicopter provided by the present invention;

[0020] Figure 2 A schematic diagram of the mathematical model provided by this invention;

[0021] Among them, 1-crossbeam, 2-No. 1 fastening bolt, 3-No. 3 fastening bolt, 4-column, 5-flange, 6-base, 7-anti-fall pin, 8-A hinge, 9-No. 2 fastening bolt, 10-B hinge, 11-force gauge, 12-circular track, 13-torque bar, 14-rubber sleeve, 15-height adjustment bar. Detailed Implementation

[0022] This invention provides a precision measuring device for the torque of a large ball joint in a helicopter. Using this fixture, the pulling direction of the force gauge is always perpendicular to the direction of the handle, and the reading of the force gauge is the actual starting force. This fixture can help to accurately measure the starting force of the large ball joint, and finally calculate the accurate starting torque.

[0023] Example 1

[0024] like Figure 1 As shown, this invention provides a precision measuring device for the torque of a large ball joint on a helicopter, comprising a base 6, a flange 5, a column 4, a crossbeam 1, a height adjusting rod 15, a fall prevention pin 7, a torque rod 13, a circular track 12, a rubber sleeve 14, a force gauge 11, hinge A 8, hinge B 10, a first fastening bolt 2, a second fastening bolt 9, and a third fastening bolt, forming a 3-component system.

[0025] Flange 5, column 4 and base 6 keep coaxial, flange 5 is screwed on base 6, column 4 is inserted into flange 5, flange 5 and column 4 adopt small gap fit; Crossbeam 1 is arranged in horizontal direction, which is cylindrical structure, crossbeam 1 is inserted into cylindrical horizontal hole of column 4, which adopts gap fit; Height adjusting rod 15 is arranged in vertical direction, which is cylindrical structure, height adjuster is inserted into cylindrical vertical hole of crossbeam 1, which constitutes A hinge 8, which adopts small gap fit; Circular pin hole is arranged on upper part of height adjusting rod 15, T-shaped anti-falling pin 7 is inserted into circular pin hole; Square slot is arranged on lower part of height adjusting rod 15, both sides of fork ear hole are opened, diameter of fork ear hole is consistent with angle shaft hole of front end of annular track 12, after being inserted into angle shaft of annular track 12, B hinge 10 is formed by cooperation, annular track 12 can rotate around B hinge 10; Torque rod 13 is thin-walled pipe, scale is arranged on torque rod 13, which is used for reading size data, large ball hinge fixing tool is connected to bottom of torque rod 13, torque rod 13 is inserted into fork ear space track in middle of annular track 12, which is used for transmitting starting torque; Annular track 12 is circular arc structure, in width direction, it includes three sub-track, middle is fork ear space track, both sides are dynamometer 11 track, front end of annular track 12 is angle shaft and shaft hole; Rubber sleeve 14 is sleeved on torque rod 13, which slightly exceeds position of annular track 12.

[0026] Preferably, diameter of base 6 is greater than 20cm, height of flange 5 is greater than 10cm.

[0027] It should be noted that main support structure of device is composed of base 6, flange 5 and column 4, pie-shaped base 6 provides sufficient stability, diameter is greater than 20cm, which keeps device from shaking and falling during use. Flange 5, column 4 and base 6 keep coaxial, height of flange 5 is greater than 10cm, which is screwed on base 6, column 4 is inserted into flange 5, flange 5 and column 4 adopt small gap fit, which ensures that column 4 can be smoothly inserted into flange 5 and does not shake.

[0028] It should be noted that crossbeam 1 is inserted into cylindrical horizontal hole of column 4, which adopts gap fit, which ensures that crossbeam 1 can be freely adjusted in horizontal hole, which can be manually operated horizontal hinge fastening bolt to tightly fix position of crossbeam 1 on column 4. Main function of crossbeam 1 and No. 1 fastening bolt 2 is to adjust working function structure in appropriate horizontal position.

[0029] It should be supplemented that height adjusting rod 15 can be freely adjusted in vertical hole, which can also be freely rotated in vertical hole. And height and horizontal plane angle of height adjusting rod 15 can be tightly fixed on crossbeam 1 by manually operating No. 2 fastening bolt 9. Main function of height adjusting rod 15, A hinge 8 and No. 1 fastening bolt 2 is to adjust working function structure in appropriate height and horizontal plane direction.

[0030] Preferably, the diameter of the circular pin hole is 0.2 times the height adjustment rod 15, the diameter of the pin head is 2 times the pin column, the length of the pin column is 2 times the pin head, and the length of the pin head is equivalent to the diameter of the height adjustment rod 15.

[0031] It should be added that the T-shaped anti-falling pin 7 is inserted into the circular pin hole to prevent the risk of damage caused by the sliding of the working function structure.

[0032] It should be added that the main working function structure of the helicopter large ball hinge torque precision measurement device is composed of the annular track 12, the torque rod 13, the rubber sleeve 14, and the force gauge 11, and the main working function structure of the device is the core component for accurately measuring the starting torque of the large ball hinge.

[0033] Specifically, the length of the torque rod 13 ranges from 50 cm to 200 cm.

[0034] Specifically, the annular track 12 is a 75° circular arc structure with a radius of 100 cm, and the width of each of the three sub-fractal tracks is 1.2 times the diameter of the torque rod 13.

[0035] It should be added that the annular track 12 not only ensures that the torque rod 13 can freely travel in the fork ear spatial track, but also ensures that the amount of shaking of the torque rod 13 in the fork ear spatial track can be ignored.

[0036] Specifically, the distance between the center point of the small ring on the rubber sleeve 14 and the annular track 12 is consistent with the distance between the center point of the hook of the force gauge 11 and the annular track 12.

[0037] It should be added that the rubber sleeve 14 is sleeved on the torque rod 13 and slightly exceeds the position of the annular track 12, so as to ensure that the rubber sleeve 14 does not contact the annular track 12. The distance between the center point of the small ring on the rubber sleeve 14 and the annular track 12 is consistent with the distance between the center point of the hook of the force gauge 11 and the annular track 12, so as to ensure the consistency of the force. The hook of the force gauge 11 hooks the small ring on the rubber sleeve 14, so as to pull the torque rod 13 to move along the annular track 12.

[0038] Embodiment Two

[0039] The embodiment of the present application provides a use method of the helicopter large ball hinge torque precision measurement device, and the method comprises the following steps:

[0040] Step 1. After assembly, the appropriate position of the working function structure on the horizontal plane is adjusted by adjusting the first fastening bolt 2 and the cross beam 1, the appropriate height of the working function structure on the vertical plane is adjusted by adjusting the second fastening bolt 9 and the height rod, and the certain angle of the working function structure on the horizontal plane is adjusted by adjusting the A hinge 8 and the height rod. After adjustment, all are fastened. Subsequently, the angle is taken as 0°.

[0041] Step 2. Refer to the diameter θ and height H of the large ball hinge, and fix the force moment rod 13 on the commonly used large ball hinge inner fixing device.

[0042] Step 3. Insert the force moment rod 13 into the annular track 12, and record the contact point of the force moment rod 13 with the fork-shaped track as reading a.

[0043] Step 4. Rotate the force moment rod 13 along the annular track 12 by 30°, and observe whether the contact point of the force moment rod 13 with the fork-shaped track is still reading X. If not, adjust the angle of the B hinge 10 and the track in the vertical direction to make the contact point of the force moment rod 13 with the fork-shaped track reading X. The purpose of this step is to ensure that the track circle and the large ball hinge are concentric circles.

[0044] Step 5. Put the rubber sleeve 14 on the force moment rod 13 slightly beyond the position of the annular track 12, and ensure that the rubber sleeve 14 does not contact the annular track 12. Record the contact point of the rubber sleeve 14 with the force moment rod 13 as reading Y.

[0045] Step 6. Use the force gauge 11 to hook the small ring on the rubber sleeve 14, and lay the force gauge 11 on the fork-shaped track according to the usage requirements.

[0046] Step 7. Adjust the distance between the center point of the small ring on the rubber sleeve 14 and the annular track 12 to be consistent with the distance between the center point of the force gauge 11 and the annular track 12, so as to ensure the consistency of the force direction.

[0047] Step 8. Pull the force gauge 11 along the track at a uniform speed, and read the value. Do this for a total of 3 times, and take the average value Z.

[0048] Step 9. Calculate the large ball hinge moment as Q = (H / 2 + Y) * Z, as shown in the formula. Figure 2

[0049] Step 10. Rotate the tire by 45° at a time, and measure the large ball hinge moment at 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360°, a total of eight orientations.

[0050] Key points of the application:

[0051] 1. The diameter of the pie-shaped base 6 is greater than 20 cm, and the height of the flange 5 is greater than 10 cm. The flange 5 and the stand 4 are matched with a small gap to prevent the entire device from shaking and falling during use.

[0052] 2. The diameter of the circular pin hole on the height adjusting rod 15 is 0.2 times the diameter of the height adjusting rod 15. The T-shaped anti-falling pin 7 adopts a cylindrical combination structure, the pin head diameter is 2 times the pin column diameter, the pin column length is 2 times the pin head length, and the pin head length is comparable to the diameter of the height adjusting rod 15.

[0053] ​3. The torque bar 13 is 100cm high and has graduations for reading. The circular track 12 is a 75° arc structure with a radius of 100cm. The width of the three fractal tracks (the middle one is the fork-shaped space track, and the two sides are the force gauge 11 tracks) is 1.2 times the diameter of the torque bar 13. This design ensures that the torque bar 13 can move freely within the fork-shaped space track while also ensuring that the amount of swaying of the torque bar 13 within the fork-shaped space track is negligible.

[0054] 4. The crossbeam 1 can adjust the position of the working functional structure on the horizontal plane, the height bar can adjust the height of the working functional structure on the vertical plane, hinge A 8 can adjust the angle of the working functional structure on the horizontal plane, and hinge B 10 can adjust the angle of the working functional structure on the vertical plane.

[0055] In summary, the technical effects of this application are as follows:

[0056] 1. This invention is designed based on a precise mathematical model, and the starting torque of the large ball joint can ultimately be calculated based on the mathematical model.

[0057] 2. The design of the circular track 12 and a series of matching structures ensures that the pulling direction of the force gauge 11 is always perpendicular to the direction of the handle, and the reading of the force gauge 11 is the true magnitude of the starting force, thus guaranteeing the accuracy of the starting force.

[0058] 3. By using actual dimensional readings of the structure and calculating the lever arm using a mathematical model, the accuracy of the lever arm was ensured. This, in turn, guaranteed the accuracy of the final calculated starting torque of the large ball joint.

[0059] 4. This invention has a simple structure, is easy to disassemble and assemble, is easy to use, and can fundamentally improve accuracy, making it an excellent helicopter ground support device.

Claims

1. A precision measuring device for the torque of a large ball joint in a helicopter, characterized in that, The helicopter large ball joint torque precision measuring device comprises a base (6), a flange (5), a column (4), a crossbeam (1), a height adjustment bar (15), a fall prevention pin (7), a torque bar (13), a ring track (12), a rubber sleeve (14), a force gauge (11), hinge A (8), hinge B (10), a first fastening bolt (2), a second fastening bolt (9), and a third fastening bolt (3), wherein: The flange (5), column (4), and base (6) are coaxial. The flange (5) is screwed onto the base (6), and the column (4) is inserted into the flange (5). The flange (5) and column (4) are fitted with a small clearance. The crossbeam (1) is arranged in the horizontal direction and is a cylindrical structure. The crossbeam (1) is inserted into the cylindrical horizontal hole of the column (4) and is fitted with a clearance. The height adjustment rod (15) is arranged in the vertical direction and is a cylindrical structure. The height adjustment rod (15) is inserted into the cylindrical vertical hole of the crossbeam (1) to form an A-hing (8) and is fitted with a small clearance. The upper part of the height adjustment rod (15) is provided with a circular pin hole, and the anti-fall pin (7) is a T-shaped anti-fall pin. The T-shaped anti-fall pin (7) is inserted into the circular pin hole. The lower part of the height adjustment rod (15) has a large cylindrical opening with a square groove, and the two sides have fork ears with holes. The diameter of the angle shaft hole at the front end of the annular track (12) is consistent with that of the angle shaft. After the angle shaft of the annular track (12) is inserted, it forms a B hinge (10). The annular track (12) can rotate around the B hinge (10). The torque bar (13) is a thin-walled circular tube. The torque bar (13) is set with a scale for reading dimensional data. The bottom of the torque bar (13) is connected to a large ball joint fixing fixture. The upper part of the torque bar (13) is inserted into the fork-ear space track in the middle of the annular track (12) to transmit the starting torque. The annular track (12) is an arc structure. In the width direction, it includes three fractal tracks. The middle one is the fork-ear space track, and the two sides are the force gauge (11) tracks. The front end of the annular track (12) is the angle shaft and the shaft hole. The rubber sleeve (14) is fitted on the torque bar (13) and slightly exceeds the position of the annular track. The crossbeam adjusts the position of the working functional structure on the horizontal plane, the height bar adjusts the height of the working functional structure on the vertical plane, hinge A adjusts the angle of the working functional structure on the horizontal plane, and hinge B adjusts the angle of the working functional structure on the vertical plane.

2. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The diameter of the circular pin hole is 0.2 times that of the height adjustment bar (15), the diameter of the pin head is twice that of the pin post, and the length of the pin post is twice that of the pin head.

3. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The length of the pin is the same as the diameter of the height adjustment bar (15).

4. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The length of the torque bar (15) ranges from 50 to 200 cm.

5. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The circular track (12) is a 75° circular arc structure with a radius of 100cm.

6. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The width of each of the three fractal orbits is 1.2 times the diameter of the torque bar (13).

7. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The distance between the center point of the small ring on the rubber sleeve (14) and the circular track (12) is the same as the distance between the center point of the hook of the force gauge (11) and the circular track.

8. The precision measuring device for the large ball joint torque of a helicopter according to claim 1, characterized in that, The base (6) has a diameter greater than 20 cm, and the flange (5) has a height greater than 10 cm.

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