Aero-engine bolt visual positioning system fixing support

Abstract

The application belongs to the technical field of visual detection, and discloses an aviation engine bolt visual positioning system fixing support, which is used to solve the problems that the existing visual system fixing support is difficult to adjust the shooting angle and difficult to determine the camera position. The fixing support comprises a camera mounting structure, a centering clamping structure and a support base disc. Three rows of countersunk head threaded holes are arranged on the upper end surface of the support base disc, three dovetail type guide rails are arranged on the lower end surface, and a circular recess is arranged on the upper end surface. The centering clamping structure comprises a clamping screw, and the head of the clamping screw is matched with the recess of the support base disc. The camera mounting structure comprises a vertical rectangular frame which is connected with the clamping screw through a screw. By rotating the vertical rectangular frame to drive the clamping screw to rotate, the height of the rotating arm base, the rotating angle of the rectangular arm support and the angle of the camera fixing seat relative to the camera rotating joint fixing seat can be adjusted, so that the shooting requirements of the camera at most positions and any angles in the rotor inner cavity can be met.

Description

Technical Field

[0001] This invention belongs to the field of visual inspection technology, and specifically relates to a fixing bracket for a visual positioning system for aircraft engine bolts. Background Technology

[0002] Bolted connections are widely used in the connection of disc and drum components of aero engines due to their simple structure and reliable safety. To improve assembly performance, it is necessary to automatically acquire assembly parameters such as interface stiffness and bolt preload, which relies on high-precision visual positioning of the bolts. Besides being affected by the camera's own performance, the shooting angle and shooting distance also significantly affect the accuracy of visual positioning. Currently, common camera mounting brackets on the market have the following problems:

[0003] 1) Difficult to adjust the shooting angle.

[0004] 2) The spatial coordinates of the camera are difficult to determine.

[0005] 3) The internal structure of an aircraft engine is complex, making it difficult to insert the support bracket.

[0006] 4) It is difficult to establish the positional conversion relationship between the internal cavity of the aero-engine and the fixed support.

[0007] Therefore, a fixed bracket is needed that can flexibly adjust the position of the visual positioning system and accurately establish the transformation relationship between the camera coordinate system and the aero-engine rotor coordinate system. Summary of the Invention

[0008] The purpose of this invention is to provide a fixed bracket that can penetrate deep into the internal cavity of an aircraft engine, enabling the visual positioning system to arbitrarily change its position and shooting angle in three-dimensional space, thereby solving the problems mentioned in the background art.

[0009] The technical solution of the present invention is as follows:

[0010] A visual positioning system mounting bracket for an aircraft engine bolt includes a camera mounting structure, a centering clamping structure, and a bracket base disc. The upper surface of the bracket base disc has three rows of countersunk threaded holes spaced at 120° intervals, and the lower surface has three dovetail guide rails. The countersunk threaded holes are used to install dovetail guide rail fixing screws to secure the dovetail guide rails. A circular groove is located at the center of the upper surface of the bracket base disc, and a threaded hole is provided in the circular groove for a clamping screw to pass through. The clamping screw is a truncated cone and a rod, with the truncated cone located at the end of the rod. The upper surface of the truncated cone has four sets of threaded holes spaced at 90° intervals. Two opposite faces of the lower end of a vertical rectangular frame have short bracket connecting plates, and the other two opposite faces have long bracket connecting plates. Both the short and long bracket connecting plates have a reinforcing rib, two through holes at the lower end, and one through hole at the upper end. The lower end of the vertical rectangular frame has two through holes for the vertical rectangular frame fixing bolts to pass through, thereby fixing the short and long bracket connecting plates to the vertical rectangular frame.

[0011] The centering clamping structure includes a rubber pressure head, a pressure head base, a three-head clamping slider, a dovetail groove slider, and a pressure head connecting rod. The pressure head base is an L-shaped plate, one of which is fixed to the dovetail groove slider by pressure head base fixing screws. The dovetail groove slider is set on a dovetail guide rail. The rubber pressure head is fixed to the dovetail groove slider, which is parallel to the other plate of the pressure head base. The rubber pressure head is equipped with fixing screws, and the other plate of the pressure head base opposite to the rubber pressure head is equipped with screw holes. The pressure head base is equipped with two reinforcing ribs, each... Each reinforcing rib has a through hole, and the center lines of two through holes coincide. The three-head clamping slider passes through the round rod of the clamping screw and is fixed on it. The three-head clamping slider has a threaded through hole in the middle. With the threaded through hole as the axis, there are three sets of rectangular structures at 120° intervals. Each set of rectangular structures has two coaxial through holes. The pressure head connecting rod has through holes at both ends. One end is fixed in a set of rectangular structures on the three-head clamping slider, and the other end is fixed to the pressure head base by the pressure head joint pin locking pin and the pressure head joint pin.

[0012] The camera mounting structure includes a rotating arm base, a sliding rectangular arm, a rotating rectangular arm bracket, a vertical rectangular frame, a camera rotating joint fixing seat, and a camera fixing seat. The rotating arm base has a square through hole at its center, a frustum at its upper end, and a square cylinder at its lower end. Two threaded holes are located on the side of the square cylinder for installing locking screws on the rotating arm base. The rotating rectangular arm bracket has a square through hole on its right side that mates with the sliding rectangular arm. Both sides of the square through hole have threaded holes. The rotating rectangular arm bracket has a cylindrical groove on its left side that mates with the frustum at the upper end of the rotating arm base. The bottom of the cylindrical groove has a threaded through hole; the camera rotating joint mounting seat has a square groove for engaging with the sliding rectangular arm, and also has two threaded holes; the camera rotating joint mounting seat has a rectangular flange with a through hole; the camera mounting seat comprises an L-shaped plate, one plate having two camera mounting threaded holes, and the other plate having one through hole and two threaded holes, for mounting the camera rotating joint clamping pin and the camera rotating joint locking screw, respectively; the camera mounting seat is fixed by the camera rotating joint clamping nut and the camera rotating joint bearing through the through hole on the rectangular flange.

[0013] The beneficial effects of this invention are as follows: By rotating the vertical rectangular frame, the clamping screw rotates, causing the three rubber pressure heads to advance simultaneously along their respective tracks. The interaction between the rubber pressure heads and the internal structure of the aero-engine rotor ensures that the central axis of this invention coincides with the rotor axis. By adjusting the height of the rotating arm base, the rotation angle of the rotating rectangular arm support, and the position of the sliding rectangular arm, the camera can be positioned in most locations within the rotor cavity. Adjusting the angle of the camera mount relative to the camera rotating joint mount allows for shooting at any angle. Attached Figure Description

[0014] Figure 1 An exploded view of the overall structure of a fixing bracket for a visual positioning system for aircraft engine bolts;

[0015] Figure 2 An exploded view of a camera mounting structure for a bolt visual positioning system for an aircraft engine;

[0016] Figure 3 An exploded view of a centering and clamping structure for a fixing bracket of a visual positioning system for aircraft engine bolts;

[0017] Figure 4 A bottom view of a mounting bracket for a visual positioning system for aircraft engine bolts;

[0018] Figure 5 A top view of a mounting bracket for a visual positioning system for aircraft engine bolts;

[0019] Figure 6A schematic diagram of the rotating rectangular arm bracket in a visual positioning system for aircraft engine bolts;

[0020] Figure 7 This is a schematic diagram of a visual positioning system for aircraft engine bolts fixing bracket working in a simulated rotor of a certain type of aircraft engine.

[0021] In the diagram: 1. Support base disc; 2. Short support connecting plate; 3. Sliding rectangular arm; 4. Sliding arm locking screw; 5. Rotating arm locking screw; 6. Rotating rectangular arm support; 7. Rotating arm base; 8. Vertical rectangular frame; 9. Long support connecting plate; 10. Support connecting plate fixing screw; 11. Dovetail guide rail fixing screw; 12. Vertical rectangular frame fixing bolt; 13. Camera rotating joint clamping nut; 14. Camera rotating joint bearing; 15. Camera rotating joint 16. Camera mounting base; 17. Camera rotating joint clamping pin; 18. Camera rotating joint locking screw; 19. Rotating arm base locking screw; 20. Rubber pressure head; 21. Pressure head base; 22. Pressure head joint pin; 23. Three-head clamping slider; 24. Clamping screw; 25. Dovetail guide rail; 26. Dovetail groove slider; 27. Pressure head joint pin locking pin; 28. Pressure head base fixing screw; 29. ​​Fixing screw; 30. Pressure head connecting rod. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. This description is not restrictive, and the actual use is not limited thereto.

[0023] refer to Figure 1-7 One embodiment of the present invention provides a fixing bracket for a visual positioning system for aircraft engine bolts, comprising a bracket base disc 1, two short bracket connecting plates 2, a sliding rectangular arm 3, four sliding arm locking screws 4, a rotating arm locking screw 5, a rotating rectangular arm bracket 6, a rotating arm base 7, a vertical rectangular frame 8, two long bracket connecting plates 9, eight bracket connecting plate fixing screws 10, nine dovetail guide rail fixing screws 11, two sets of vertical rectangular frame fixing bolts 12, a camera rotating joint clamping nut 13, and seven camera rotating joint bearings 14. 15. Camera rotating joint fixing seat; 16. Camera rotating joint clamping pin; 17. Two camera rotating joint locking screws; 18. Two rotating arm base locking screws; 19. Three rubber pressure heads; 20. Three pressure head bases; 21. Six pressure head joint pins; 22. Three-head clamping sliders; 23. Clamping screws; 24. Three dovetail guide rails; 25. Three dovetail groove sliders; 26. Six pressure head joint pin locking pins; 27. Twelve pressure head base fixing screws; 28. Twelve rubber pressure head fixing screws; 29. ​​Six pressure head connecting rods; 30. Three pressure head connecting rods.

[0024] The clamping screw 24 is inserted through the central through hole of the bracket base disk 1, and its lower end is screwed into the central threaded hole of the three-head clamping slider 23. Its head is inserted into the groove of the bracket base disk 1. It is connected to the vertical rectangular frame 8 by the short bracket connecting plate 2, the long bracket connecting plate 9, the bracket connecting plate fixing screw 10, and the vertical rectangular frame fixing bolt 12. Therefore, by rotating the vertical rectangular frame 8, the three-head clamping slider 23 can make linear motion in the clamping screw 24.

[0025] The rubber pressure head 20, pressure head base 21, and dovetail slider 26 are connected together by screws. The dovetail slider 26 cooperates with the dovetail guide rail 25, constraining the dovetail slider 26 to only perform fixed linear motion. The through hole included in the pressure head base 21 has the same size as the through hole of the three-head clamping slider 23. The two are connected together by the camera rotation joint bearing 14, the pressure head joint pin 22, and the pressure head connecting rod 30. Therefore, the linear motion of the three-head clamping slider 23 can drive the rubber pressure head 20 to perform linear motion, such as... Figure 7 As shown, when the rubber indenter 20 contacts the inner wall of the rotor, the central axis of the present invention can be aligned with the rotor axis.

[0026] The rotating arm base 7 is fitted onto the vertical rectangular frame 8 through a square hole. After the position is freely adjusted, the rotating arm base locking screw 19 is used to fix its position on the vertical rectangular frame 8. The circular groove of the rotating rectangular arm bracket 6 mates with the frustum of the rotating arm base 7, allowing the rotating rectangular arm bracket 6 to rotate freely. The rotation angle of the rotating rectangular arm bracket 6 is fixed using the rotating arm locking screw 5.

[0027] The relative positions of the sliding rectangular arm 3, the rotating rectangular arm bracket 6, and the camera rotating joint fixing seat 15 can be fixed by using the sliding arm locking screw 4. The sliding rectangular arm 3 can slide freely on the rotating rectangular arm bracket 6 to adjust the position of the camera rotating joint fixing seat 15.

[0028] The rotating joint mounting base 15 is connected to the camera mounting base 16 via the camera rotating joint clamping nut 13, the camera rotating joint bearing 14, and the camera rotating joint clamping pin 17. The camera mounting base 16 is connected to the camera via two threaded holes. By adjusting the angle of the camera mounting base 16 and tightening the camera rotating joint clamping pin 17, the rotational movement of the camera mounting base 16 can be restricted, thereby meeting the shooting requirements of the camera at any angle.

Claims

1. A fixing bracket for a visual positioning system of aircraft engine bolts, characterized in that, The visual positioning system for aircraft engine bolts includes a camera mounting structure, a centering clamping structure, and a support base disc. The upper surface of the support base disc has three rows of countersunk threaded holes spaced at 120° intervals, and the lower surface has three dovetail guide rails. The countersunk threaded holes are used to install dovetail guide rail fixing screws to fix the dovetail guide rails. A circular groove is provided at the center of the upper surface of the support base disc, and a threaded hole is provided in the circular groove for the clamping screw to pass through. The clamping screw is a truncated cone and a round rod with the truncated cone located at the end of the round rod. The upper surface of the truncated cone has four sets of threaded hole pairs spaced at 90° intervals. Short support connecting plates are provided on two opposite sides of the lower end of the vertical rectangular frame, and long support connecting plates are provided on the other two opposite sides. Both the short support connecting plates and the long support connecting plates have a reinforcing rib, two through holes at the lower end, and one through hole at the upper end. The lower end of the vertical rectangular frame has two through holes for the vertical rectangular frame fixing bolts to pass through, thereby fixing the short support connecting plates and the long support connecting plates to the vertical rectangular frame. The centering clamping structure includes a rubber pressure head, a pressure head base, a three-head clamping slider, a dovetail groove slider, and a pressure head connecting rod. The pressure head base is an L-shaped plate, one of which is fixed to the dovetail groove slider by pressure head base fixing screws. The dovetail groove slider is set on a dovetail guide rail. The rubber pressure head is fixed to the dovetail groove slider, and it is parallel to the other plate of the pressure head base. The rubber pressure head is equipped with fixing screws, and the other plate of the pressure head base opposite the rubber pressure head is equipped with screw holes. The pressure head base is equipped with two reinforcing ribs. Each reinforcing rib has a through hole, and the center lines of the two through holes coincide. The three-head clamping slider is threadedly connected to the clamping screw. The three-head clamping slider has a threaded through hole in the middle. With the threaded through hole as the axis, there are three sets of rectangular structures at 120° intervals. Each set of rectangular structures has two coaxial through holes. The pressure head connecting rod has through holes at both ends. One end is rotatably connected to a set of rectangular structures on the three-head clamping slider, and the other end is rotatably connected to the pressure head base through the pressure head joint pin locking pin and the pressure head joint pin. The camera mounting structure includes a rotating arm base, a sliding rectangular arm, a rotating rectangular arm bracket, a vertical rectangular frame, a camera rotating joint fixing seat, and a camera fixing seat. The rotating arm base has a square through hole at its center, a frustum at its upper end, and a square cylinder at its lower end. The square cylinder has two threaded holes for installing locking screws on the rotating arm base. The rotating rectangular arm bracket has a square through hole on its right side that mates with the sliding rectangular arm. Both sides of the square through hole have threaded holes. The rotating rectangular arm bracket has a cylindrical groove on its left side that mates with the through hole, and the cylindrical groove mates with the frustum at the upper end of the rotating arm base. The bottom of the cylindrical groove has a threaded through hole; the camera rotating joint mounting seat has a square groove for engaging with the sliding rectangular arm, and also has two threaded holes; the camera rotating joint mounting seat has a rectangular flange with a through hole; the camera mounting seat comprises an L-shaped plate, one plate having two camera mounting threaded holes, and the other plate having a through hole and two threaded holes, for mounting the camera rotating joint clamping pin and the camera rotating joint locking screw, respectively; the camera mounting seat is fixed by the camera rotating joint clamping nut, the camera rotating joint bearing, and the through hole on the rectangular flange.

Images