Special device for fixing airplane pull rod

Abstract

The invention discloses a special device for fixing an airplane pull rod, which belongs to the technical field of aviation equipment and comprises a fixed base, a cover plate, a screw-in rod, a cam and a positioning pin, an arc-shaped through groove is formed in the fixed base and used for placing the pull rod, the positioning pin is arranged beside the fixed base, and the top end of the positioning pin is inserted into a rivet hole of the pull rod to fix one end of the pull rod. Arc-shaped through grooves are formed in the corresponding positions of the lower surface of the cover plate, the cover plate covers the fixed base and clamps the pull rod through the arc-shaped through grooves, the upper end of the fixed base is in threaded fit with the screw-in rod, a cam is fixed to the screw-in rod, and the screw-in rod is operated to rotate the cam to press the cover plate so as to clamp the pull rod. The device is firm in fixation and convenient to operate, and operability of single-person assembly of the airplane pull rod is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation equipment and relates to a special device for fixing an aircraft pull rod. Background Art

[0002] The aircraft control system is a key system for controlling the flight attitude of an aircraft and plays a crucial role during aircraft navigation. This system is mainly used for a pilot to operate the aircraft for yawing, pitching, rolling, etc. to control the flight attitude of the aircraft. Whether its function is normal directly determines whether the aircraft can fly safely. The sizes of pull rods vary, some are large and some are small. The number of pull rods on an aircraft is huge, distributed throughout various parts and systems of the whole aircraft, with the most in the control system and being the most typical. Moreover, the maintenance amount of pull rods is large and the maintenance tasks are relatively onerous. Pull rods are the main transmission components in the aircraft control system and their role cannot be underestimated. Pull rods are hinged to parts such as rocker arms, support arms, lever rods or supports during use to transfer displacement or play a fixing role. The assembly drawing of a certain type of aircraft pull rod is shown in Figure 1 which mainly consists of an adjustable ear joint, a fork joint, a nut, a spring pull rod, etc., and is provided with rivet holes.

[0003] During the assembly of the pull rod, it is necessary to first position the rivet holes, then fix the pull rod, and then operate on the rivet hole positions. The existing operation method is to fix the positioning tool on the vise, then align the rivet holes of the pull rod with the positioning tool, and the other end of the pull rod is manually fixed by another person before the next operation can be carried out. The disadvantages of this operation method include: the positioning tool is a general tool and is relatively rough; there is a lack of special tooling for the fixing device. The operation of two people is time-consuming and laborious, and the operation is inconvenient. In certain situations, it is even easy to cause harm to the fixing personnel and there is a certain risk; the fixing strength is not strong, and there will be shaking during the next operation, affecting the assembly quality and delaying production. Therefore, a special fixing device is urgently needed to meet the assembly and fixing requirements of aircraft pull rods, so as to release manpower, improve quality, and eliminate potential hazards. Summary of the Invention

[0004] In view of this, the present invention provides a special device for fixing an aircraft pull rod, which is used for the assembly of aircraft pull rods, removes potential safety hazards, improves the assembly efficiency, improves the repair quality, and saves the repair cost.

[0005] The present invention adopts the following technical solutions:

[0006] A special device for fixing an aircraft pull rod includes a fixed base 1, a cover plate 2, a screw-in rod 3, a pin 4, a key 5, a cam 6, and a positioning pin 7.

[0007] The upper part of the fixed base 1 is a flat plate with an arc-shaped through groove on its upper surface. On both sides of the arc-shaped through groove, there are vertical plates, and threaded holes of the same axis are made on the upper parts of the vertical plates. The lower part of the fixed base 1 is a column for clamping on a vise. A strip-shaped platform parallel to and longer than the arc-shaped through groove is made in the middle of the column. Threaded holes are made at the ends of the strip-shaped platform, and the axes of the threaded holes are coplanar with the axis of the arc-shaped through groove.

[0008] The positioning pin 7 has an external thread and is in threaded fit with the threaded hole on the strip-shaped platform of the fixed base 1. Its top end is inserted into the rivet hole of the pull rod for positioning, and its top end is at the same height as the axis of the pull rod placed on the fixed base 1 to prevent the pull rod from being distorted. The positioning pin 7 can adjust its height to adapt to pull rods of different sizes.

[0009] Both ends of the cover plate 2 are made with parallel through grooves. The cover plate 2 is placed on the fixed base 1, and the vertical plates on both sides of the fixed base 1 pass through the two through grooves respectively. The two are in sliding fit to realize the limit of the cover plate 2. An arc-shaped through groove is also made on the lower surface of the cover plate 2, which cooperates with the arc-shaped through groove on the fixed base 1 to clamp the pull rod.

[0010] The screw-in rod 3 is a threaded rod, which passes through and is in threaded fit with the threaded holes on the vertical plates on both sides of the fixed base 1. A handle is made at one end, and a pin 4 is provided at the other end to prevent the screw-in rod 3 from falling off. Two grooves are made in the middle of the screw-in rod 3, and keys 5 are embedded in both of them.

[0011] The cam 6 is an elliptical plate. A through hole is made at one end along its long axis, and a groove is made on one side edge of the through hole. The diameter of the through hole is set according to the outer diameter of the screw-in rod 3. Two cams 6 with the same structure are provided, and they are put on the screw-in rod 3. The two keys 5 on the screw-in rod 3 are embedded in the grooves on the two cams to fix the cam 6 on the screw-in rod 3, and their installation angles are the same. By rotating the screw-in rod 3, the end of the cam 6 far from the screw-in rod 3 is used to press the cover plate 2 tightly to realize the clamping of the pull rod. The method of eccentric rotation of the cam 6 can conveniently and quickly fix pull rods of various different diameters.

[0012] Furthermore, the fixed base 1, the cover plate 2, the screw-in rod 3, the cam 6, and the positioning pin 7 are all made of 45# steel, which has high strength and is not easy to deform.

[0013] Furthermore, a layer of felt is glued inside the arc-shaped through grooves on the fixed base and the cover plate to protect the clamping part of the pull rod from being damaged.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention is a combined component, which is firmly fixed and convenient to operate, realizing the operability of single-person assembly of aircraft pull rods.

[0016] 2. The present invention adopts an arc-shaped groove structure to clamp the pull rod, and different diameters of pull rods can be tightened by rotating and pressing the cover plate with the cam for assembly.

[0017] 3. The fixed base, positioning pin and cover plate of the present invention are on the same plane, and there will be no torsional deformation when fixing the pull rod, thus ensuring the maintenance quality of the aircraft pull rod. It is applicable not only to the assembly of the pull rod but also to the disassembly of the pull rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the assembly drawing of a certain type of aircraft pull rod;

[0019] Figure 2 is the overall effect drawing of the present invention;

[0020] Figure 3 is the assembly schematic diagram of the present invention;

[0021] Figure 4 is the schematic diagram of the fixed base, wherein (a) is the front view and (b) is the side view;

[0022] Figure 5 is the schematic diagram of the positioning pin;

[0023] Figure 6 is the schematic diagram of the cover plate, wherein (a) is the sectional view and (b) is the top view;

[0024] Figure 7 is the schematic diagram of the screw-in rod, wherein (a) is the front view and (b) is the side view;

[0025] Figure 8 is the schematic diagram of the cam, wherein (a) is the front view and (b) is the side sectional view.

[0026] Among them, 1 is the fixed base, 2 is the cover plate, 3 is the screw-in rod, 4 is the pin, 5 is the key, 6 is the cam, and 7 is the positioning pin. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will describe the specific implementation manners of the present invention in detail according to the technical solutions.

[0028] A special device for fixing an aircraft pull rod, as Figure 2 shown in and as shown in 3, includes a fixed base 1, a cover plate 2, a screw-in rod 3, a pin 4, a key 5, a cam 6, and a positioning pin 7.

[0029] As Figure 4 shown, the upper part of the fixed base 1 is a flat plate with an arc-shaped through groove on the upper surface. Vertical plates are provided on both sides of the arc-shaped through groove, and coaxial threaded holes are made in the upper parts of the vertical plates. The lower part of the fixed base 1 is a column for clamping on a vise. A strip-shaped platform parallel to and longer than the arc-shaped through groove is made in the middle of the column, and a threaded hole is made at the end of the strip-shaped platform. The axis of the threaded hole is coplanar with the axis of the arc-shaped through groove.

[0030] As Figure 5 shown, the positioning pin 7 has an external thread and is threadedly engaged with the threaded holes on the strip-shaped platform of the fixed base 1. Its top end is inserted into the rivet hole of the pull rod for positioning, and its top end is at the same height as the axis of the pull rod placed on the fixed base 1, avoiding distortion of the pull rod. The positioning pin 7 can adjust its height to accommodate pull rods of different sizes.

[0031] As Figure 6 shown, both ends of the cover plate 2 are provided with parallel through slots. The cover plate 2 covers the fixed base 1, and the vertical plates on both sides of the fixed base 1 pass through the two through slots respectively, and the two are slidably engaged to limit the cover plate 2. An arc-shaped through slot is also formed on the lower surface of the cover plate 2, which cooperates with the arc-shaped through slot on the fixed base 1 to clamp the pull rod.

[0032] As Figure 7 shown, the screw-in rod 3 is a threaded rod. It passes through and is threadedly engaged with the threaded holes on the vertical plates on both sides of the fixed base 1. One end of it is provided with a handle, and the other end is provided with a pin 4 to prevent the screw-in rod 3 from falling off. Two grooves are formed in the middle of the screw-in rod 3, and keys 5 are embedded in both of them.

[0033] As Figure 8 shown, the cam 6 is an elliptical plate. A through hole is formed at one end along its long axis, and a groove is formed on one side edge of the through hole. The diameter of the through hole is set according to the outer diameter of the screw-in rod 3. Two cams 6 with the same structure are provided, and the two are sleeved on the screw-in rod 3. The two keys 5 on the screw-in rod 3 are embedded in the grooves on the two cams to fix the cam 6 on the screw-in rod 3, and their installation angles are the same; by rotating the screw-in rod 3, the end of the cam 6 away from the screw-in rod 3 is used to press the cover plate 2 to clamp the pull rod. The eccentric rotation method of the cam 6 can conveniently and quickly fix pull rods of various different diameters.

[0034] The fixed base 1, the cover plate 2, the screw-in rod 3, the cam 6, and the positioning pin 7 are all made of 45# steel, with relatively high strength and not easily deformed.

[0035] The working process is as follows: Clamp the lower end of the fixed base 1 with a vise, align the positioning pin 7 with the rivet hole on the pull rod and insert it to support one end of the pull rod. Place the pull rod in the arc-shaped through slot of the fixed base 1 and adjust the height of the positioning pin 7 to make the axis of the pull rod horizontal; then cover the pull rod with the cover plate 2. The axes of the fixed base 1, the positioning pin 7, and the cover plate 2 are in the same plane, which can ensure that the pull rod is located in the middle position between the arc-shaped through slots of the fixed base 1 and the cover plate 2 at this time; rotate the screw-in rod 3 to make the elliptical cam 6 press the cover plate 2, thereby clamping and fixing the pull rod, and then the pull rod assembly is carried out.

[0036] In summary, the above is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special device for fixing the aircraft pull rod, characterized in that, It includes a fixed base (1), a cover plate (2), a screw-in rod (3), a key (5), a cam (6), and a positioning pin (7); The upper part of the fixed base (1) is a flat plate with an arc-shaped through groove on its upper surface. On both sides of the arc-shaped through groove, there are vertical plates. The upper parts of the vertical plates are made with coaxial threaded holes. The lower part of the fixed base (1) is a column for clamping on a vise. In the middle of the column, there is a strip-shaped platform parallel to and longer than the arc-shaped through groove. At the end of the strip-shaped platform, there is a threaded hole, and the axis of the threaded hole is coplanar with the axis of the arc-shaped through groove; The positioning pin (7) has an external thread and is threadedly engaged with the threaded hole on the strip-shaped platform of the fixed base (1). Its top end is inserted into the rivet hole of the pull rod for positioning, and its top end is at the same height as the axis of the pull rod placed on the fixed base (1). The positioning pin (7) can adjust its height to accommodate pull rods of different sizes; Both ends of the cover plate (2) are made with parallel through grooves. The cover plate (2) covers the fixed base (1), and the vertical plates on both sides of the fixed base (1) pass through the two through grooves respectively. The sliding fit between them realizes the limit of the cover plate (2). The lower surface of the cover plate (2) is also made with an arc-shaped through groove, which cooperates with the arc-shaped through groove on the fixed base (1) to clamp the pull rod; The screw-in rod (3) is a threaded rod, which passes through and is threadedly engaged with the threaded holes on the vertical plates on both sides of the fixed base (1); The cam (6) is an elliptical plate. At one end along its long axis, there is a through hole, and the diameter of the through hole is set according to the outer diameter of the screw-in rod (3). The cam (6) is fixed in the middle of the screw-in rod (3). By rotating the screw-in rod (3), the cam (6) rotates eccentrically, and the end of the cam (6) far from the screw-in rod (3) presses the cover plate (2).

2. The special device for fixing the aircraft pull rod according to claim 1, characterized in that, One end of the screw-in rod (3) is provided with a pin (4) to prevent the screw-in rod (3) from falling off.

3. The special device for fixing the aircraft pull rod according to claim 1, characterized in that, A groove is made in the middle of the screw-in rod (3), and a key (5) is embedded in the groove. A groove is made on one side edge of the through hole of the cam (6), which cooperates with the groove installed on the screw-in rod (3) to realize the fixation of the cam (6).

4. The special device for fixing the aircraft pull rod according to claim 1 or 3, characterized in that, There are two cams (6) with the same structure, and their installation angles are the same.

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