Length adjusting device and method for pull rod of flight control system

Abstract

The invention provides a length adjusting device and method for a flight control system pull rod, and the device comprises a supporting part, a fixing assembly and an adjusting assembly, and the fixing assembly is fixed on the supporting part; the adjusting assembly is located on the guide rail of the supporting component and can move left and right along the guide rail. One end of the pull rod is fixed on the fixing assembly, and the other end is located on the adjusting assembly. The adjusting device moves on the guide rail, so that the pull rods with different length requirements can be quickly assembled, the assembly efficiency of the flight control system can be effectively improved, and the assembly and adjustment cost of the flight control system is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aircraft power supply, and particularly relates to a length adjustment device and method for a pull rod of a flight control system. BACKGROUND

[0002] During the assembly process of a helicopter flight control system, the length of a corresponding rudder and sensor pull rod needs to be adjusted to the requirements of a design document on the ground, and then a fastening force is fixed to meet the corresponding flight index.

[0003] At present, the pull rod relies on manual measurement of the fastening force, and the length of the pull rod changes during the fastening process. With the upgrading of the flight control system, the precision requirement of ground adjustment is rising, and the manual measurement method cannot meet the installation and adjustment requirements of the new generation of unmanned high-speed helicopter flight control systems. SUMMARY

[0004] The technical problem to be solved by the application is that the manual measurement method cannot meet the installation and adjustment requirements of the new generation of unmanned high-speed helicopter flight control systems.

[0005] The technical scheme of the application is as follows: A length adjustment device for a pull rod of a flight control system, comprising a support component, a fixing assembly and an adjusting assembly, The fixing assembly is fixed to the support component, the adjusting assembly is located on a guide rail of the support component and can move left and right along the guide rail, one end of the pull rod is fixed to the fixing assembly, and the other end is located on the adjusting assembly.

[0006] Optionally, the support component comprises a base 1, a handle 5 and a length scale 10, the base 1 is a cuboid structure, and two installation holes are distributed on both sides for installing the handle 5, one end of the base 1 is provided with four installation holes adapted to the fixing assembly, and the other end is provided with a guide rail along the installation hole axis of symmetry, and the length scale 10 is pasted on the side of the guide rail.

[0007] Optionally, the fixing assembly comprises a connecting piece 4, a first fixing bolt 8, a first positioning pin 9, a first positioning nut 11 and a first positioning bolt 12, the connecting piece 4 is a T-shaped block structure, two screw holes and pin installation holes are distributed at the bottom corners, the connecting piece 4 is positioned and connected with the base 1 through the first fixing bolt 8 and the first positioning pin 9, a threaded hole adapted to the second positioning bolt 12 is formed in the upper part of the connecting piece 4, and one end of the pull rod is fixed at this position through the first positioning nut 11 during adjustment.

[0008] Optionally, the adjusting assembly comprises a connecting block 2, a positioning block 3, a knurled high nut 6, a stop bolt 7, a second fixing bolt 13, a second positioning pin 14, a second positioning bolt 15, and a second positioning nut 16. The connecting block 2 is a cuboid structure, and a U-shaped groove is formed in the front end. The groove width is matched with the stop bolt 7. The knurled high nut 6 is combined with the stop bolt 7 and installed into the U-shaped groove. Two screw installation holes and pin installation holes are distributed in the middle of the connecting block 2. A hole matched with the stop bolt 7 is formed in the rear of the connecting block 2. The knurled high nut 6 is combined with the stop bolt 7 and installed into the hole. The positioning block 3 is a T-shaped block structure. Two screw installation holes and pin installation holes are distributed in the bottom of the positioning block 3. The second fixing bolt 13 and the second positioning pin 14 are used to positionally connect the connecting block 2 and the positioning block 3. A threaded hole matched with the second positioning bolt 15 is formed in the upper part of the positioning block 3. The other end of the pull rod is fixed at the position by the second positioning nut 16 during adjustment.

[0009] Optionally, T-shaped guide rails are distributed on the other end of the base 1 along the installation hole axis of symmetry. The adjusting assembly can stably slide along the guide rails.

[0010] Optionally, indication lines are engraved on the connecting block 2 and the positioning block 3, which are used to determine the length of the pull rod together with the length scale 10. The indication lines of the positioning block 3 are located on the axis of symmetry of the second positioning bolt 15 installation hole. The length of the adjusted pull rod can be accurately obtained because the center of the pull rod with a handle bearing overlaps the center of the second positioning bolt 15 installation hole.

[0011] The second positioning pin 14 is an internally threaded cylindrical pin, and the length thereof is not more than the sum of the thicknesses of the connecting block 2 and the positioning block 3. The effect is to avoid interference between the adjusting assembly and the supporting component during sliding.

[0012] Optionally, the indication lines of the connecting block 2 and the positioning block 3 overlap in the orthographic projection of the side P of the positioning block 3 after the connecting block 2 and the positioning block 3 are assembled. The adjustment accuracy of the pull rod can be improved.

[0013] Optionally, the stop bolt 7 is a T-shaped groove bolt, and the distance between the two parallel sides of the bolt head is matched with the width of the bottom of the guide rail of the base 1.

[0014] In the second aspect, a length adjustment method for a pull rod of a flight control system is provided. The method is used for the length adjustment device for the pull rod of the flight control system in the first aspect. The method comprises the following steps: One end of the pull rod is fixed on the fixing assembly, and the other end is installed on the adjusting assembly; The pull rod body is rotated, so that the adjusting assembly moves left and right along the guide rail of the supporting component. The length of the pull rod is adjusted until the length requirement is met; The position of the adjusting assembly is fixed; After the locking nut on the pull rod is tightened, the lock washer is used to prevent loosening.

[0015] The beneficial effects of the present application are: The present application provides a pull rod assembly clamp for unmanned high-speed helicopter flight control system installation adjustment and an adjustment method thereof, which can realize quick assembly of pull rods with different length requirements by moving on the guide rail through the adjusting device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the device structure of the present application.

[0017] Wherein, 1-base, 2-connection block, 3-positioning block, 4-connection piece, 5-handle, 6-knob high nut, 7-stop bolt, 8-first fixing bolt, 9-first positioning pin, 10-length scale, 11-first positioning nut, 12-first positioning bolt, 13-second fixing bolt, 14-second positioning pin, 15-second positioning bolt, 16-second positioning nut. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] The features and illustrative embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments below is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific settings and methods presented below, but covers any improvements, replacements and modifications of structures, methods and devices without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary obscuring of the present application.

[0020] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be mutually referenced and quoted.

[0021] The present application will be described in detail below with reference to the drawings and specific embodiments.

[0022] The application relates to a pull rod assembly of a flight control system of an unmanned high-speed helicopter. Figure 1 The application provides a length adjusting device of a flight control system pull rod. The support component, the fixing assembly and the adjusting assembly are in positional relationship. The fixing assembly is fixed to the support component, the adjusting assembly is located on a guide rail of the support component and can move left and right along the guide rail, one end of the pull rod is fixed to the fixing assembly, and the other end of the pull rod is located on the adjusting assembly.

[0023] The support component comprises a base 1, a handle 5 and a length scale 10. The handle 5 is a welded handle. The base 1 is a cuboid structure and is provided with two mounting holes on two sides for mounting the handle 5. One end of the base 1 is provided with four mounting holes matched with the fixing assembly, and the other end is provided with a guide rail along the mounting hole axis of symmetry. The length scale 10 is pasted on the side of the guide rail.

[0024] The fixing assembly comprises a connecting piece 4, a first fixing bolt 8, a first positioning pin 9, a first positioning nut 11 and a first positioning bolt 12. The connecting piece 4 is a T-shaped block structure and is provided with two screw holes and pin mounting holes at the bottom, and is positioned and connected with the base 1 through the first fixing bolt 8 and the first positioning pin 9. A threaded hole matched with the first positioning bolt 12 is formed in the upper part of the connecting piece 4, and one end of the pull rod is fixed at the position through the first positioning nut 11 during adjustment.

[0025] The adjusting assembly comprises a connecting block 2, a positioning block 3, a knurled high nut 6, a stop bolt 7, a second fixing bolt 13, a second positioning pin 14, a second positioning bolt 15 and a second positioning nut 16. The connecting block 2 is a cuboid structure and is provided with a U-shaped groove in the front end, the groove width is matched with the stop bolt 7, and the knurled high nut 6 is combined with the stop bolt 7 and installed into the U-shaped groove. Two screw mounting holes and pin mounting holes are distributed at the corners of the middle part of the connecting block 2. A mounting hole matched with the stop bolt 7 is formed in the rear part of the connecting block 2, and the knurled high nut 6 is combined with the stop bolt 7 and installed into the hole. The positioning block 3 is a T-shaped block structure and is provided with two screw mounting holes and pin mounting holes at the corners of the bottom, and is positioned and connected with the connecting block 2 through the second fixing bolt 13 and the second positioning pin 14. A threaded hole matched with the second positioning bolt 15 is formed in the upper part of the positioning block 3, and the other end of the pull rod is fixed at the position through the second positioning nut 16 during adjustment.

[0026] Specifically, the handle mounting holes on both sides of the base 1 are M4 threaded holes, and the distributed guide rails are T-shaped guide rails with a total length of 560mm and a total depth of 20mm. After the connecting block 2 and the positioning block 3 are combined, they can slide freely on the guide rails and be fixed in position by the stop bolts 7, allowing for rod length adjustment within the range of 100mm-500mm. The screw holes and pin holes on the base 1 that connect to the connecting piece 4 are all through holes, and the screw holes and pin holes are diagonally distributed on both sides of the guide rail axis of symmetry. The screw holes are M8 threaded holes, and the pin holes are Φ8 through holes.

[0027] Specifically, the connecting block 2 and the positioning block 3 are engraved with indicator lines to determine the length of the pull rod together with the length scale 10. The engraving line of the positioning block 3 is located on the axis of symmetry of the mounting hole of the second positioning bolt 15. Furthermore, after the connecting block 2 and the positioning block 3 are assembled, the orthographic projections of their engraving lines on the side surface P of the positioning block 3 overlap. The center of the locking screw mounting hole at the rear of the U-shaped groove on the connecting block 2 is located on the axis of symmetry of the U-shaped groove. The screw holes and pin holes on the bottom surfaces of the connecting block 2 and the positioning block 3 are all through holes. The screw holes and pin holes of the connecting block 2 are diagonally distributed on both sides of the axis of symmetry of the U-shaped groove. The screw holes are M8 threaded holes, and the pin holes are Φ8 round holes. They are symmetrical about this axis of symmetry. The mounting hole of the second positioning bolt 15 on the positioning block 3 is an M6 screw hole. The parallelism between its central axis and the bottom surface of the positioning block 3 is less than 0.05mm, and the perpendicularity between the side surface of the positioning block 3 and the bottom surface is less than 0.05mm.

[0028] Specifically, the second locating pin 14 is an internally threaded cylindrical pin, the length of which does not exceed the sum of the thicknesses of the connecting block 2 and the locating block 3.

[0029] Specifically, the scale range of length scale 10 is 300mm-550mm.

[0030] Specifically, the stop bolt 7 is a T-slot bolt, and the distance between the two parallel sides of its bolt head is adapted to the width of the bottom of the guide rail of the base 1. The stop bolt 7 is connected to the knurled high nut 6 by threads. After the positioning block 3 is positioned in the base 1, the length of the stop bolt 7 in the guide rail is changed by rotating the knurled high nut 6 to increase friction and ensure that the position of the positioning block 3 remains unchanged.

[0031] Specifically, the screw holes and pin holes on connector 4 are all through holes. An embodiment of the present invention also provides a method for installing and adjusting a flight control system using a lever assembly clamp, the method comprising: Step 1: Confirm that the helicopter is in a normal parking state and check that there are no extra components on the main and tail rotor servos.

[0032] Step 2: Install the main rotor control system, fix the three main rotor servo support assemblies on the main rotor platform of the middle fuselage by screws, and confirm that the three servo support assemblies are installed flat. Confirm that the output shaft of the main rotor servo is adjusted to zero position, wherein the rocker arm of the upper main rotor servo is arranged to the left, and the rocker arm of the lower main rotor servo is arranged to the right. Fix the main rotor on the support by bolts and self-locking nuts.

[0033] Step 3: Check the two groups of main rotor boosters that control the up and down rotors, make the automatic tilt ring plane perpendicular to the rotor shaft, and fix it using mechanical pins.

[0034] Step 4: Assemble the stop washer, locking nut, and bearing with handle on the pull rod body in order. Install the bearing with handle at one end of the pull rod on the first positioning bolt 12 above the screw hole of the connecting piece 4. Rotate the knurled high nut 6 to make the connecting block 2 freely slide on the T-shaped guide rail of the base 1, install the bearing with handle at the other end of the pull rod to the second positioning bolt 15 above the screw hole of the positioning block 3, and fix the bearings at both ends using the first and second positioning nuts 11 and 16.

[0035] Step 5: Rotate the pull rod body so that the indicated lines on the connecting block 2 and the positioning block 3 align with 413mm on the length scale 10. Rotate the knurled high nut 6 to make the stop bolt 7 contact the base 1, and fix the position of the adjustment assembly. Tighten the locking nut on the pull rod and use the stop washer to prevent loosening.

[0036] Step 6: Connect the input rocker arm of the booster at one end of the pull rod with a screw, and connect the output rocker arm of the main rotor servo at the other end. The installation and adjustment process of the pull rod is completed.

[0037] Step 7: Install the propulsion rotor control system, and confirm that the propulsion rotor servo rocker arm is at 90° with the servo mounting surface. Install the propulsion rotor servo on the tail structure of the fuselage.

[0038] Step 8: Fix the movable end of the propulsion rotor booster to the tail structure through a screw, and connect the movable end to the anti-twist rod rocker.

[0039] Step 9: Assemble the stop washer, locking nut, and bearing with handle on the pull rod body in order. Install the bearing with handle at one end of the pull rod on the first positioning bolt 12 above the screw hole of the connecting piece 4. Rotate the knurled high nut 6 to make the connecting block 2 freely slide on the T-shaped guide rail of the base 1, install the bearing with handle at the other end of the pull rod to the second positioning bolt 15 above the screw hole of the positioning block 3, and fix the bearings at both ends using the first and second positioning nuts 11 and 16.

[0040] Step 10: Rotate the pull rod body so that the indicated lines on the connecting block 2 and the positioning block 3 align with 326mm on the length scale 10. Rotate the knurled high nut 6 so that the stop bolt 7 contacts the base 1, fixing the position of the adjusting device. After tightening the locking nut on the pull rod, use the locking washer to prevent loosening.

[0041] Step 11: Connect one end of the pull rod to the rudder arm of the rudder using a screw, and the other end to the propulsion paddle booster. At this point, the installation and adjustment process of the second pull rod is complete.

[0042] Step 12: Install the flight control rudder control system. Fix the rudder support on the horizontal tail rudder support surface, and screw the rudder to the rudder support.

[0043] Step 13: Assemble the locking washer, locking nut, and bearing with handle on the pull rod body in order. Install the bearing with handle on one end of the pull rod above the first positioning bolt 12 in the screw hole of the connecting piece 4. Rotate the knurled high nut 6 so that the connecting block 2 can slide freely on the T-shaped guide rail of the base 1. Install the bearing with handle on the other end of the pull rod to the second positioning bolt 15 above the screw hole of the positioning block 3, and use the first positioning nut 11 and the second positioning nut 16 to fix the bearings at both ends.

[0044] Step 14: Rotate the pull rod body so that the indicated lines on the connecting block 2 and the positioning block 3 align with 475mm on the length scale 10. Rotate the knurled high nut 6 so that the stop bolt 7 contacts the base 1, fixing the position of the adjusting device. After tightening the locking nut on the pull rod, use the locking washer to prevent loosening.

[0045] Step 15: Connect one end of the pull rod to the rudder arm of the rudder using a screw, and the other end to the rudder extension. At this point, the installation and adjustment process of the third pull rod is complete.

[0046] Step 16: Install the elevator control system. Connect the elevator to the support through a screw. Then install the rudder support on the support rib of the horizontal tail. Ensure that the rudder arm and the rudder mounting surface are at 90°.

[0047] Step 17: Assemble the locking washer, locking nut, and bearing with handle on the pull rod body in order. Install the bearing with handle on one end of the pull rod above the first positioning bolt 12 in the screw hole of the connecting piece 4. Rotate the knurled high nut 6 so that the connecting block 2 can slide freely on the T-shaped guide rail of the base 1. Install the bearing with handle on the other end of the pull rod to the second positioning bolt 15 above the screw hole of the positioning block 3, and use the first positioning nut 11 and the second positioning nut 16 to fix the bearings at both ends.

[0048] Step 18: Rotate the pull rod body, so that the connection block 2 and the positioning block 3 are aligned with the 513mm mark on the length scale 10. Rotate the knurled high nut 6 so that the stop bolt 7 is in contact with the base 1, and fix the position of the adjusting device. After tightening the locking nut on the pull rod, use the locking washer to prevent loosening.

[0049] Step 19: Connect one end of the pull rod to the elevator control arm at the tail rudder, and the other end to the elevator control arm extension. At this point, the fourth pull rod installation and adjustment process is complete.

[0050] The present application provides a pull rod assembly clamp for the installation and adjustment of an unmanned high-speed helicopter flight control system, and an adjustment method thereof. By adjusting the device to move on the guide rail, different length requirements of the pull rod can be quickly assembled. This scheme can effectively improve the assembly efficiency of the flight control system and reduce the assembly and adjustment cost of the flight control system. It has a great promoting effect on the installation and adjustment of the helicopter flight control system.

[0051] The above only expresses the embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. In addition, the non-exhaustive parts of the present application are all conventional technologies.

Claims

1. A length adjustment device for a flight control system control rod, characterized in that, include: Support components, fixing components, and adjustment components. The fixing component is fixed to the support component; The adjustment component is located on the guide rail of the support component and can move left and right along the guide rail; one end of the pull rod is fixed to the fixed component, and the other end is located on the adjustment component.

2. The apparatus as claimed in claim 1, characterized in that, The supporting components include a base, a handle, and a length scale. The base is a cuboid structure with two mounting holes on each side for mounting the handle. One end of the base has four mounting holes that are compatible with the fixing components, and the other end has a guide rail distributed along the axis of symmetry of the mounting holes. The length scale is attached to the side of the guide rail.

3. The apparatus as described in claim 1, characterized in that, The fixing component includes a connector, a first fixing bolt, a first positioning pin, a first positioning nut, and a first positioning bolt. The connector is a T-shaped block structure with two screw holes and a pin mounting hole distributed diagonally at the bottom. It is positioned and connected to the base by the first fixing bolt and the first positioning pin. The upper part of the connector has a threaded hole that matches the second positioning bolt. One end of the pull rod is fixed at this position by the first positioning nut during adjustment.

4. The apparatus as claimed in claim 2, characterized in that, The adjustment assembly includes a connecting block, a positioning block, a knurled high-profile nut, a stop bolt, a second fixing bolt, a second positioning pin, a second positioning bolt, and a second positioning nut. The connecting block has a cuboid structure with a U-shaped groove at the front end, the width of which matches the width of the stop bolt. The knurled high-profile nut is assembled with the stop bolt and installed into the U-shaped groove. Two screw mounting holes and a pin mounting hole are diagonally distributed in the middle of the connecting block. A mounting hole matching the stop bolt is opened at the rear of the connecting block, and the knurled high-profile nut is assembled with the stop bolt and installed into this hole. The positioning block has a T-shaped structure with two screw mounting holes and a pin mounting hole diagonally distributed at the bottom. It is positioned and connected to the connecting block by the second fixing bolt and the second positioning pin. A threaded hole matching the second positioning bolt is opened on the upper part of the positioning block, and the other end of the pull rod is fixed in this position by the second positioning nut during adjustment.

5. The apparatus as described in claim 2, characterized in that, T-shaped guide rails are distributed along the axis of symmetry of the mounting holes at the other end of the base.

6. The apparatus as claimed in claim 4, characterized in that, Indicator lines are engraved on the connecting block and the positioning block to determine the length of the tie rod together with the length scale. The engraving line on the positioning block is located on the axis of symmetry of the second positioning bolt mounting hole. The second locating pin is an internally threaded cylindrical pin, the length of which does not exceed the sum of the thicknesses of the connecting block and the locating block.

7. The apparatus as claimed in claim 6, characterized in that, After the connecting block and the positioning block are assembled, the orthographic projections of their scribe lines on the side P of the positioning block overlap.

8. The apparatus as claimed in claim 5, characterized in that, The locking bolt is a T-slot bolt, and the distance between the two parallel sides of the bolt head is adapted to the width of the bottom of the base guide rail.

9. A method for adjusting the length of a control stick in a flight control system, characterized in that, The method for the length adjustment device for a flight control system control stick as described in any one of claims 1 to 8 includes: One end of the pull rod is fixed to the fixing component, and the other end is installed on the adjusting component; Rotate the pull rod to move the adjustment component left and right along the guide rail of the support component, and adjust the length of the pull rod until the length requirement is met; The position of the fixed adjustment component; After tightening the lock nut on the pull rod, use a locking washer to prevent loosening.

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