Aircraft pitot tube boom straightening and positioning device

Abstract

A device for leveling and positioning holes for an aircraft pitot tube support rod includes an outer sleeve, a drill sleeve, a spring sleeve, a screw plug, and a horizontal sleeve. The outer sleeve is a cylindrical tube into which the support rod can be inserted. The side wall of the outer sleeve has drill sleeve fitting holes that match the positions and number of holes to be drilled on the support rod. The drill sleeve is installed in the drill sleeve fitting holes and has a drill guide hole. The spring sleeve includes a fixing part and an expansion part. The fixing part is fitted to the outer end face of the annular retaining ring of the outer sleeve, and the expansion part extends rearward through the annular retaining ring of the outer sleeve into the inner cavity of the support rod. A screw plug is fitted inside the spring sleeve, which presses the outer wall of the support rod against the inner wall of the outer sleeve. One end of the horizontal sleeve is fitted outside the outer sleeve, and the other end is partially cut to form a horizontal reference surface parallel to its central axis. This invention maintains the stability of the pitot tube's performance parameters, thus ensuring safe flight of the aircraft.

Description

Technical Field

[0001] This utility model relates to the field of aircraft maintenance technology, specifically a leveling and positioning hole-making device for an aircraft pitot tube support rod. Background Technology

[0002] The pitot tube, mounted on the nose or wing of an aircraft and pointing directly forward, is a crucial atmospheric data sensor. It utilizes the pitot tube principle to accurately measure total atmospheric pressure and static pressure during flight. The computer then uses formulas such as Bernoulli's total static pressure equation to calculate the flight speed, climb rate, and atmospheric pressure required for flight control. Because the pitot tube is affected by airflow interference during operation, the longer the pitot tube and the greater the distance between the front pressure measuring port and the fuselage, the closer the measured static pressure will be to the true atmospheric static pressure. Therefore, to ensure accuracy and reliability, the pitot tube requires support from a forward-extending pitot tube strut, and its axis must be parallel to the airflow direction.

[0003] When replacing a damaged pitot tube strut during aircraft maintenance, it is necessary to drill a hole in situ at the front end of the newly replaced strut according to the design drawings and with reference to the structure of the damaged strut. This ensures that the central axis of the pitot tube after assembly is parallel to the aircraft's horizontal reference plane, thereby restoring the pitot tube's performance parameters. (See attached diagram) Figures 1 to 3 The diagram shows a support rod 1 for an aircraft pitot tube. It has two sets of assembly holes at the front of the rod body. Each set of assembly holes includes three circular holes 1-1 evenly arranged circumferentially. The two sets of assembly holes are arranged in a staggered manner at a fixed angle. After the support rod 1 is assembled with the aircraft body, the positions of the two sets of assembly holes must meet the set angle requirements. Therefore, in-situ hole making can only be carried out after the assembly process of the support rod 1 and the aircraft is completed. For this reason, it is necessary to design an innovative special device for leveling, positioning and hole making of the aircraft pitot tube support rod that is simple in structure, quick to operate and suitable for on-site assembly. Utility Model Content

[0004] This utility model provides a leveling and positioning hole-making device for an aircraft pitot tube support rod. It aims to accurately position and fix the outer sleeve to the front of the support rod through the cooperation of a spring sleeve, a screw plug, a level sleeve and a level instrument, and to make in-situ holes on the support rod by a drill sleeve set on the outer sleeve, so as to realize that the axis of the pitot tube installed on the support rod is parallel to the aircraft's reference horizontal plane, so as to keep the performance parameters of the pitot tube stable and achieve the purpose of ensuring safe flight after aircraft maintenance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for leveling and positioning holes for an aircraft pitot tube support rod includes an outer sleeve, a drill sleeve, a spring sleeve, a screw plug, and a horizontal sleeve. The outer sleeve is a cylindrical sleeve, and the inner wall of the outer sleeve matches the outer wall of the support rod. The support rod can be inserted into the inner cavity of the outer sleeve. An annular retaining ring protruding into the inner cavity is provided at the front end of the outer sleeve. The annular retaining ring limits the axial movement of the front end of the support rod. Drill fitting holes matching the position and number of holes to be drilled on the support rod are provided on the side wall of the outer sleeve. The drill bushing is installed in the drill bushing fitting hole, and the center hole of the drill bushing is the drill bit guide hole during the hole making process; The spring sleeve includes a fixing part and an expansion part. The fixing part is assembled with the outer end face of the outer annular retaining ring. The expansion part can extend backward through the outer annular retaining ring into the inner cavity of the support rod. A screw plug is installed inside the spring sleeve. One end of the screw plug can be screwed into the expansion part of the spring sleeve, squeezing the expansion part of the spring sleeve to expand outward, so that the outer wall of the support rod fits and presses tightly against the inner wall of the outer sleeve. One end of the horizontal sleeve is fitted over the outer sleeve, located at the end where the outer sleeve mates with the spring sleeve. The other end of the horizontal sleeve is cut off in half to form a horizontal reference plane parallel to its central axis.

[0006] In the aforementioned aircraft pitot tube support rod leveling and positioning hole-making device, the expansion part of the spring sleeve is a thin-walled sleeve, the inner wall of the thin-walled sleeve is a conical surface structure, and several expansion grooves are evenly opened on the thin-walled sleeve along the circumference. The expansion grooves extend along the axial direction to form an opening groove that communicates with the outer edge of the expansion part.

[0007] The aforementioned aircraft pitot tube support rod leveling and positioning hole-making device has a connecting plate and a threaded sleeve at the fixing part of the spring sleeve. One side of the connecting plate is connected to the expansion part, and the other side is connected to the threaded sleeve. The inner wall of the threaded sleeve is provided with internal threads.

[0008] The aforementioned aircraft pitot tube support rod leveling and positioning hole-making device includes a screw plug comprising a screwing part, a threaded connection part, and an expansion core; the expansion core is a truncated cone structure that mates with the expansion part of the spring sleeve, and its large-diameter end is connected to the screwing part through the threaded connection part; the threaded connection part is provided with an external thread that matches the internal thread of the threaded sleeve of the spring sleeve; the screwing part is a polygonal prism structure.

[0009] In the aforementioned aircraft pitot tube support rod leveling and positioning hole-making device, the connecting disc of the outer sleeve and the spring sleeve are connected together by a set of positioning pins. A first positioning hole is provided on the outer end face of the annular retaining ring of the outer sleeve, and a second positioning hole is provided on the connecting disc of the spring sleeve. The number and position of the first positioning hole and the second positioning hole are matched. One end of the positioning pin is interference-fitted with the first positioning hole, and the other end passes through the second positioning hole.

[0010] In the aforementioned aircraft pitot tube support rod leveling and positioning hole-making device, the outer sleeve and the horizontal sleeve are circumferentially positioned by a positioning plate. A first positioning groove is provided at one end of the annular retaining ring of the outer sleeve, and a second positioning groove is provided at the assembly end of the horizontal sleeve and the outer sleeve. The first positioning groove is a long groove extending axially along the outer sleeve to communicate with the outer edge of the annular retaining ring of the outer sleeve. The second positioning groove is a long groove extending axially along the horizontal sleeve to communicate with the inner edge of the horizontal sleeve, and the central axis of the second positioning groove is located on the horizontal reference plane of the horizontal sleeve. The positioning plate is inserted into the first positioning groove and the second positioning groove.

[0011] In the above-mentioned aircraft pitot tube support rod leveling and positioning hole-making device, the outer sleeve and the horizontal sleeve are locked and fixed by set screws. A set screw mounting thread hole is provided on the outer cylindrical surface of the horizontal sleeve and the outer sleeve assembly end, and a set screw is installed in the set screw mounting thread hole.

[0012] The aforementioned aircraft pitot tube support rod leveling and positioning hole-making device has at least four sets of first positioning grooves on the outer sleeve, arranged along the circumference of the outer sleeve, with the center angle of the arc surface between two adjacent sets of first positioning grooves being 30 º, and at least one set of first positioning grooves being connected to the center of a drill set fitting hole on the outer sleeve.

[0013] The aforementioned aircraft pitot tube support rod leveling and positioning hole-making device has a set of radially extending weight-reducing long grooves on the fixing part connecting plate of the spring sleeve. The weight-reducing long grooves are located on one side of the connecting expansion part and are staggered from the second positioning hole.

[0014] The aforementioned aircraft pitot tube support rod leveling and positioning hole-making device has a weight-reducing hole in the horizontal sleeve, which is located below the horizontal reference plane.

[0015] This invention provides a device for leveling, positioning, and drilling holes on an aircraft pitot tube support rod. It is used for in-situ hole drilling on a new support rod during aircraft maintenance and replacement. One end of the new support rod, to which the hole is to be drilled, is fixedly mounted to the aircraft fuselage, while the other end is free. When drilling holes in the support rod using this invention, firstly, an outer sleeve is fitted onto the free end of the support rod. A spring sleeve and a horizontal sleeve are then fitted onto the outer end of the outer sleeve. The fitting angle of the outer sleeve is adjusted, and a level is used to verify the horizontal reference surface on the horizontal sleeve, ensuring consistency between the position of the drill sleeve on the outer sleeve and the position of the hole to be drilled. Then, the outer sleeve is clamped and fixed in place by a screw plug, spring sleeve, and support rod. The hole drilling operation on the support rod is then completed under the guidance of the drill sleeve fitted onto the outer sleeve. As can be seen, this utility model accurately positions and fixes the outer sleeve to the front of the support rod through the cooperation of the spring sleeve, screw plug, level sleeve and level instrument, and then guides the in-situ drilling on the support rod through the drill sleeve set on the outer sleeve. This achieves the parallelism of the pitot tube axis with the aircraft reference horizontal plane, maintains the stability of the pitot tube performance parameters, and achieves the purpose of ensuring safe flight after aircraft maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the support structure of an aircraft airspeed generator. Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 4 This is a schematic diagram of the structure of this utility model; Figure 5 yes Figure 4 Exploded structure diagram; Figure 6 This is a schematic cross-sectional view of the present invention; Figure 7 This is a schematic diagram of the outer garment structure; Figure 8 This is a schematic diagram of the half-section structure of the outer jacket; Figure 9 yes Figure 7 K-direction view; Figure 10 This is a schematic diagram of the spring sleeve structure; Figure 11 This is a schematic diagram of the cross-sectional structure of the spring sleeve; Figure 12 This is a schematic diagram of the screw plug structure; Figure 13 This is a schematic diagram of a horizontal sleeve structure; Figure 14 This is a schematic diagram illustrating the verification of a horizontal reference surface using a level.

[0017] Explanation of each label in the diagram: 1 is the support rod, and 1-1 is the round hole; 2 is the outer casing, 2-1 is the drill set fitting hole, 2-2 is the first positioning groove, 2-3 is the first positioning hole, and 2-4 is the annular retaining ring; 3 is the drill bushing, and 3-1 is the drill bit guide hole; 4 is a spring sleeve, 4-1 is a fixing part, 4-1-1 is a threaded sleeve, 4-1-2 is a connecting plate, 4-1-3 is a second positioning hole, 4-1-4 is a weight-reducing long groove, 4-2 is an expansion part, and 4-2-1 is an expansion groove. 5 is the screw plug, 5-1 is the screwing part, 5-2 is the threaded connection part, and 5-3 is the expansion core; 6 is the horizontal sleeve, 6-1 is the horizontal reference surface, 6-2 is the set screw assembly threaded hole, 6-3 is the second positioning groove, and 6-4 is the weight reduction hole; 7 is a locating pin; 8 represents the positioning plate; 9 is the set screw; 10 represents a level. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] See Figure 1. Figure 2 , Figure 3 A pitot tube support rod 1 for an aircraft has two sets of mounting holes at the front of the rod body for mates with the pitot tube. Each set of mounting holes includes three circular holes 1-1 evenly arranged circumferentially, and the two sets of mounting holes are arranged in a staggered manner at a fixed angle. When replacing a damaged pitot tube support rod 1 during aircraft maintenance, it is necessary to drill holes in situ at the front end of the newly replaced support rod according to the design requirements of the drawings and with reference to the structure of the damaged support rod. This ensures that the central axis of the pitot tube after assembly with the support rod 1 is parallel to the horizontal reference plane of the aircraft. Therefore, in-situ drilling can only be carried out after the assembly process of the support rod 1 and the aircraft is completed to ensure that the relevant requirements are met.

[0020] See Figure 4 , Figure 5 , Figure 6 This utility model provides a device for leveling and positioning holes for an aircraft pitot tube support rod. It includes an outer sleeve 2, a drill sleeve 3, a spring sleeve 4, a screw plug 5, and a horizontal sleeve 6. The outer sleeve 2 is a cylindrical sleeve, and the inner wall of the outer sleeve 2 matches the outer wall of the support rod 1. The front part of the support rod 1 can be inserted into the inner cavity of the outer sleeve 2. The drill sleeve 3 is installed on the side wall of the outer sleeve 2, and its number and position are consistent with the holes to be drilled on the support rod 1. The center hole of the drill sleeve 3 is the drill guide hole 3-1 during the hole-making process. The spring sleeve 4 is fitted to one end of the outer sleeve 2 and is embedded in the outer sleeve 2 and the support rod 1 inserted into the inner cavity of the outer sleeve. The screw plug 5 is screwed into the inner cavity of the spring sleeve 4, and the spring sleeve 4 can be opened by the compression of the screw plug 5, and then the spring sleeve 4 clamps the support rod 1 in the inner cavity of the outer sleeve 2. One end of the horizontal sleeve 6 is fitted outside the outer sleeve 2, located at the end where the outer sleeve 2 mates with the spring sleeve 4.

[0021] The technical solution of a specific embodiment of this utility model is described below with reference to the specific structure of each component: See Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9In a specific embodiment of this utility model, an annular retaining ring 2-4 protruding into the inner cavity is provided at the front end of the outer sleeve 2, which can axially limit the front end of the support rod 1 inserted into the outer sleeve 2; a drill sleeve fitting hole 2-1 is provided on the side wall of the outer sleeve 2, and the drill sleeve 3 is installed in the drill sleeve fitting hole 2-1 of the outer sleeve 2; a first positioning hole 2-3 is provided on the outer end face of the annular retaining ring 2-4 of the outer sleeve 2, and a positioning pin 7 is installed in the first positioning hole 2-3 by interference fit. One end of the positioning pin 7 is assembled with the first positioning hole 2-3 by interference fit, and the other end is fitted with the spring sleeve 4, so that the outer sleeve 2 and the spring sleeve 4 are circumferentially positioned by the positioning pin 7; a first positioning groove 2-2 is provided at one end of the annular retaining ring 2-4 of the outer sleeve 2. The first positioning groove 2-2 is a long groove extending along the axial direction of the outer sleeve 2 to penetrate the outer edge of the annular retaining ring 2-4 of the outer sleeve. The number of the first positioning grooves is not less than four, arranged along the circumference of the outer sleeve 2, and the central angle of the arc surface between two adjacent sets of the first positioning grooves is 30°. º, and at least one set of first positioning grooves is connected to the center of a drill fitting hole 2-1 on the outer sleeve 2, and the central symmetry plane coincides.

[0022] See Figure 4 , Figure 5 , Figure 6 , Figure 10 , Figure 11 The airspeed tube support rod leveling and positioning hole-making device of this utility model includes a spring sleeve 4 comprising a fixing part 4-1 and an expansion part 4-2. The fixing part 4-1 is provided with a connecting plate 4-1-2 and a threaded sleeve 4-1-1; one side of the connecting plate 4-1-2 is connected to the expansion part 4-2, and the other side is connected to the threaded sleeve 4-1-1. A second positioning hole 4-1-3 is provided on the connecting plate 4-1-2. The spring sleeve 4 achieves circumferential positioning by cooperating with the positioning pin 7 assembled on the outer sleeve 2 through the second positioning hole 4-1-3. In order to avoid the excessive weight of this utility model from adversely affecting the stiffness of the support rod 1 of the cantilever beam structure, in a preferred embodiment, a weight-reducing long groove 4-1-4 extending radially is provided on the connecting plate 4-1-2. The weight-reducing long groove 4-1-4 is located on the side connected to the expansion part 4-2 and is staggered with the second positioning hole 4-1-3; the inner wall of the threaded sleeve 4-1-1 is provided with internal threads. The expansion part 4-2 is a thin-walled sleeve with a conical inner wall. Several expansion grooves 4-3 are evenly opened along the circumference of the thin-walled sleeve. The expansion grooves 4-3 extend axially to form an open groove that communicates with the outer edge of the expansion part 4-2. The expansion part 4-2 can pass through the annular retaining ring 2-4 of the outer sleeve 2 and extend backward into the inner cavity of the support rod 1. A screw plug 5 is installed in the spring sleeve 4.

[0023] See Figure 4 , Figure 5 , Figure 6 , Figure 10 , Figure 11 , Figure 12The aircraft pitot tube support rod leveling and positioning hole-making device of this utility model includes a screw plug 5 comprising a screwing part 5-1, a threaded connection part 5-2, and an expansion core 5-3; the expansion core 5-3 is a frustum-shaped structure that mates with the expansion part 4-2 of the spring sleeve 4, and its large-diameter end is connected to the screwing part 5-1 through the threaded connection part 5-2; the threaded connection part 5-2 is provided with an external thread that matches the internal thread of the threaded sleeve 4-1-1 of the spring sleeve 4; the screwing part 5-1 is preferably a hexagonal prism structure that mates with a screwing tool.

[0024] See Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 13 The aircraft pitot tube support rod leveling and positioning hole-making device of this utility model has a horizontal sleeve 6, one end of which is a circular sleeve fitted outside the outer sleeve 2, and the other end is a horizontal reference surface 6-1 formed by half-sectioning and is parallel to its central axis. The utility model has a second positioning groove 6-3 on the circular sleeve on which the horizontal sleeve 6 and the outer sleeve 2 are assembled. The second positioning groove 6-3 is a long groove extending along the axial direction of the horizontal sleeve and penetrating the inner edge of the horizontal sleeve. The central axis of the second positioning groove 6-3 is located on the horizontal reference surface 6-1 of the horizontal sleeve 6. Positioning plates 8 are inserted into the first positioning groove 2-2 of the outer sleeve 2 and the second positioning groove 6-3 of the horizontal sleeve 6 at the same time, thereby realizing the circumferential positioning of the horizontal sleeve 6 and the outer sleeve 2. The utility model has a set screw assembly threaded hole 6-2 on the outer cylindrical surface of the circular sleeve of the horizontal sleeve 6. A set screw 9 is installed in the set screw assembly threaded hole 6-2, and the horizontal sleeve 6 is locked and fixed to the outer sleeve 2 by the set screw 9.

[0025] See Figures 1 to 14 When performing in-situ drilling on the support rod 1 using this utility model, one end of the new support rod with the proposed hole is fixedly assembled to the aircraft fuselage, while the other end remains free, forming a cantilever beam structure. First, an outer sleeve 2 is fitted onto the free end of the support rod 1, and a spring sleeve 4 and a horizontal sleeve 6 are fitted onto the outer end of the outer sleeve 2. Then, the assembly angle of the outer sleeve 2 is adjusted, and a level 10 is used to verify the horizontal reference surface 6-1 on the horizontal sleeve 6, ensuring that the position of the drill sleeve 3 on the outer sleeve 2 is consistent with the position of the proposed hole. Next, the screw plug 5 is tightened, causing the expansion core 5-3 to move inwards towards the expansion portion 4-2 of the spring sleeve 4. The conical surface of the expansion core 5-3 pushes open the expansion groove 4-2-1 of the expansion portion 4-2, pressing the outer wall of the support rod 1 tightly against the inner wall of the outer sleeve 2. Finally, the in-situ drilling operation on the support rod is completed under the guidance of the drill bit guide hole in the drill sleeve 3 fitted onto the outer sleeve 2.

Claims

1. An aircraft pitot tube boom straightening and positioning hole drilling apparatus, characterized by: It includes an outer sleeve (2), a drill sleeve (3), a spring sleeve (4), a screw plug (5), and a horizontal sleeve (6); The outer sleeve (2) is a cylindrical sleeve. The inner wall of the outer sleeve (2) matches the size of the outer wall of the support rod (1). The support rod (1) can be inserted into the inner cavity of the outer sleeve (2). An annular retaining ring (2-4) protruding into the inner cavity is provided at the front end of the outer sleeve (2). The annular retaining ring (2-4) limits the axial movement of the front end of the support rod (1). A drill fitting hole (2-1) matching the position and number of holes on the support rod (1) is provided on the side wall of the outer sleeve (2). The drill sleeve (3) is installed in the drill sleeve fitting hole (2-1) on the side wall of the outer sleeve (2), and the center hole of the drill sleeve (3) is the drill bit guide hole (3-1) in the hole making process. The spring sleeve (4) includes a fixing part (4-1) and an expansion part (4-2). The fixing part (4-1) is assembled with the outer end face of the annular retaining ring (2-4) of the outer sleeve (2). The expansion part (4-2) can pass through the annular retaining ring (2-4) of the outer sleeve (2) and extend rearward into the inner cavity of the support rod (1). A screw plug (5) is installed inside the spring sleeve (4). One end of the screw plug (5) can be screwed into the expansion part (4-2) of the spring sleeve (4), squeezing the expansion part (4-2) of the spring sleeve (4) to expand outward, so that the outer wall of the support rod (1) and the inner wall of the outer sleeve (2) are pressed together; One end of the horizontal sleeve (6) is fitted over the outer sleeve (2) and is located at the end of the outer sleeve (2) that mates with the spring sleeve (4). The other end of the horizontal sleeve (6) is formed by a half-section cut to create a horizontal reference plane (6-1) parallel to its central axis.

2. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 1, wherein: The expansion part (4-2) of the spring sleeve (4) is a thin-walled sleeve. The inner wall of the thin-walled sleeve is a conical structure, and several expansion grooves (4-3) are evenly opened on the thin-walled sleeve along the circumference. The expansion grooves (4-3) extend along the axial direction to form an open groove that communicates with the outer edge of the expansion part (4-2).

3. An aircraft pitot boom straightening and positioning hole drilling apparatus according to claim 1 or 2, characterised in that: The fixing part (4-1) of the spring sleeve (4) is provided with a connecting plate (4-1-2) and a threaded sleeve (4-1-1). One side of the connecting plate (4-1-2) is connected to the expansion part (4-2), and the other side is connected to the threaded sleeve (4-1-1). The inner wall of the threaded sleeve (4-1-1) is provided with an internal thread.

4. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 3, wherein: The screw plug (5) includes a screwing part (5-1), a threaded connection part (5-2), and an expansion core (5-3); the expansion core (5-3) is a frustum-shaped structure that mates with the expansion part (4-2) of the spring sleeve (4), and its large-diameter end is connected to the screwing part (5-1) through the threaded connection part (5-2); the threaded connection part (5-2) is provided with an external thread that matches the internal thread of the threaded sleeve (4-1-1) of the spring sleeve (4); the screwing part (5-1) is a polygonal prism structure.

5. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 3, wherein: The connecting plate (4-1-2) of the outer sleeve (2) and the spring sleeve (4) is connected together by a set of positioning pins (7). A first positioning hole (2-3) is provided on the outer end face of the annular retaining ring (2-4) of the outer sleeve (2), and a second positioning hole (4-1-3) is provided on the connecting plate (4-1-2) of the spring sleeve (4). The number and position of the first positioning hole (2-3) and the second positioning hole (4-1-3) are matched. One end of the positioning pin (7) is press-fitted with the first positioning hole (2-3), and the other end passes through the second positioning hole (4-1-3).

6. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 5, wherein: The outer sleeve (2) and the horizontal sleeve (6) are circumferentially positioned by a positioning plate (8). A first positioning groove (2-2) is provided at one end of the annular retaining ring (2-4) of the outer sleeve (2), and a second positioning groove (6-3) is provided at the assembly end of the horizontal sleeve (6) and the outer sleeve (2). The first positioning groove (2-2) is a long groove extending along the axial direction of the outer sleeve (2) to penetrate the outer edge of the annular retaining ring of the outer sleeve. The second positioning groove (6-3) is a long groove extending along the axial direction of the horizontal sleeve to penetrate the inner edge of the horizontal sleeve. The central axis of the second positioning groove (6-3) is located on the horizontal reference plane (6-1) of the horizontal sleeve (6). The positioning plate (8) is inserted into the first positioning groove (2-2) and the second positioning groove (6-3).

7. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 6, wherein: The outer sleeve (2) and the horizontal sleeve (6) are clamped and fixed by a set screw (9). A set screw mounting thread hole (6-2) is provided on the outer cylindrical surface of the horizontal sleeve (6) and the outer sleeve (2) at one end. A set screw (9) is installed in the set screw mounting thread hole (6-2).

8. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 7, wherein: The number of first positioning grooves (2-2) on the outer jacket (2) is not less than four sets, arranged along the circumference of the outer jacket (2), the center angle of the arc surface between two adjacent sets of first positioning grooves is 30 º, and at least one set of first positioning grooves is connected to the center of a drill fitting hole (2-1) on the outer jacket (2).

9. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 5, wherein: A weight-reducing groove (4-1-4) extending radially is provided on the connecting disc (4-1-2) of the spring sleeve (4). The weight-reducing groove (4-1-4) is located on one side of the connecting expansion part (4-2) and is arranged in a staggered manner with the second positioning hole (4-1-3).

10. The aircraft pitot mast brace levelling and positioning hole drilling apparatus of claim 1 wherein: The horizontal sleeve (6) is provided with a weight reduction hole (6-4), which is located below the horizontal reference plane (6-1).

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