A hemispherical string universal positioning fixture

Abstract

A hemispherical string type universal positioning fixture comprises a clamping mechanism, a connector, a universal adjustment mechanism, a tensioning positioning mechanism and a supporting mechanism; the clamping mechanism is connected to the universal adjustment mechanism through a connector; the universal adjustment mechanism is provided with a plurality of hemispherical bowls and expansion bowls which are superimposed and connected in series, the bottom surface of the hemispherical bowl is provided with a first central positioning hole and a first tensioning hole, the inner and outer spherical surfaces of two adjacent hemispherical bowls form a friction joint surface, the bottom surface of the expansion bowl is provided with a second central positioning hole and a second tensioning hole, and a group of radially radiating opening grooves are provided on the side wall of the expansion bowl; the tensioning positioning mechanism cooperates with the universal adjustment mechanism to fix the position of the clamping mechanism; the supporting mechanism is used to fix the hemispherical string type universal positioning fixture on a base at the work site. The hemispherical string type universal positioning fixture described in the present invention meets the requirement of fixing the operating lever in a neutral position during the maintenance of the aircraft control system.

Description

Technical Field

[0001] The invention relates to a positioning fixture, in particular to a hemispherical string type universal positioning fixture capable of keeping a control stick of an aircraft in a neutral position. Background Art

[0002] The joystick is the control stick used by the pilot to operate the elevator and aileron of the aircraft. It is usually installed in front of the pilot's seat. The pilot pushes, pulls, presses, and presses to form the displacement of the stick to control the flight state of the aircraft. The joystick is in a neutral position when not in operation. When repairing the aircraft, in order to meet the assembly and debugging requirements of other parts of the control system, the joystick needs to be fixed in a neutral position by a fixture.

[0003] At present, during the maintenance of the aircraft control system, the operator generally first determines the neutral position of the control stick, then adjusts it through the screw nut mechanism set in different directions to make the control stick in the neutral position, and then clamps it with a clamp. The above-mentioned control stick neutral position adjustment and fixing method not only has the problems of complex adjustment and clamping tooling structure and cumbersome operation steps, but also has the problem of large number of parts and large space occupied, which is inconvenient to operate, increasing the difficulty of aircraft control system maintenance. Summary of the invention

[0004] The invention provides a hemispherical string type universal positioning fixture which occupies little space and is easy to operate, and aims to fix an aircraft control stick in a neutral position through the hemispherical string type universal positioning fixture to meet the maintenance requirements of the aircraft control system.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A hemispherical string type universal positioning fixture comprises a clamping mechanism, a connector, a universal adjustment mechanism, a tensioning positioning mechanism and a supporting mechanism; the clamping mechanism is used for clamping a workpiece and is connected to the universal adjustment mechanism through a connector; the universal adjustment mechanism is provided with a plurality of hemispherical bowls and expansion bowls which are superimposed and connected in series, the bottom surface of the hemispherical bowl is provided with a first central positioning hole and a first tensioning hole, the inner and outer spherical surfaces of two adjacent hemispherical bowls form a friction engagement surface, a hemispherical bowl seat is provided between the hemispherical bowl and the expansion bowl, the bottom surface of the expansion bowl is provided with a second central positioning hole and a second tensioning hole, and a group of radially radiating opening grooves are provided on the side wall of the expansion bowl; the tensioning positioning mechanism is matched with the universal adjustment mechanism, and the position of the clamping mechanism is fixed by the tensioning positioning mechanism and the universal adjustment mechanism; the supporting mechanism is used to fix the hemispherical string type universal positioning fixture on a base at a work site.

[0007] The above-mentioned hemispherical string type universal positioning fixture has a limiting flange at the opening end of the hemispherical bowl.

[0008] The above-mentioned hemispherical string universal positioning fixture, the supporting mechanism includes a base plate and a sleeve, the base plate is fixed on a base at the work site, the sleeve is sleeved on the outside of the expansion bowl and the hemispherical bowl seat, and the outer wall of the sleeve is welded and assembled with the base plate.

[0009] In the above-mentioned hemispherical string type universal positioning fixture, the outer edge of the expansion bowl is in a square structure, and the inner wall of the sleeve matches the shape of the outer edge of the expansion bowl.

[0010] The above-mentioned hemispherical string universal positioning clamp, the tensioning and positioning mechanism includes a pull rope and a tensioning assembly, the pull rope passes through the first tensioning hole on the bottom surface of each hemispherical bowl and the second tensioning hole on the bottom surface of each expansion bowl, one end of the pull rope is fixed on the connecting head to form a closed rope loop, and the other end of the rope loop cooperates with the tensioning assembly, and the tensioning state of the pull rope is controlled by the tensioning assembly.

[0011] The above-mentioned hemispherical string universal positioning clamp, the tensioning assembly includes a tensioning screw sleeve, a handwheel, a slip ring, a tension block and a pull rope fixing top screw; the tensioning screw sleeve is provided with a fixed seat at one end, and an external thread matching the handwheel is provided on the side wall at the other end, and a slide groove is axially provided on the side wall provided with the external thread, and the fixed seat is embedded in the sleeve of the supporting mechanism in an interference fit manner; the handwheel is sleeved on the external thread part of the tensioning screw sleeve; the slip ring is sleeved on the outside of the tensioning screw sleeve in a clearance fit manner, and is located on one side of the handwheel, and the slip ring is fixedly assembled with the tension block by a screw passing through the slide groove; the tension block is placed in the tensioning screw sleeve, and a pull rope fixing top screw is equipped on the tension block.

[0012] The above-mentioned hemispherical string type universal positioning fixture has a pull rope avoidance groove which is arranged symmetrically on the inner wall of the tightening screw sleeve. The pull rope passes through the pull rope avoidance groove and is fixed in the clamping groove of the tension block by the pull rope fixing top screw.

[0013] The above-mentioned hemispherical string universal positioning clamp, the clamping mechanism includes a left clamping piece, a right clamping piece, a locking bolt and a locking nail; one end of the left clamping piece and the right clamping piece are hingedly assembled through a pin shaft installed on the connecting head; the locking bolt passes through the other end of the left clamping piece and the right clamping piece, and fixes the left clamping piece and the right clamping piece through the locking nail.

[0014] The above-mentioned hemispherical string type universal positioning fixture, after the workpiece is fixedly clamped by the left clamping member and the right clamping member, the left clamping member and the right clamping member are fixedly connected to the connecting head through the fixing pin.

[0015] In the above-mentioned hemispherical string type universal positioning fixture, elastic protective pads are arranged on the inner side walls of the left clamping member and the right clamping member.

[0016] The present invention is a hemispherical string type universal positioning fixture, which is provided with a plurality of superimposed and serially connected hemispherical bowls and expansion bowls in a universal adjustment mechanism, and the pull rope in the tension positioning mechanism is passed through the first tension hole on the bottom surface of the hemispherical bowl and the second tension hole on the bottom surface of the expansion bowl, and the working state of the pull rope is controlled by the tensioning assembly in the tension positioning mechanism. When the pull rope is in a tensioning state, the inner and outer spherical surfaces of the two adjacent hemispherical bowls are squeezed against each other to generate friction, thereby preventing the relative movement between the two, and at the same time, the two adjacent expansion bowls are squeezed against each other to generate elastic deformation, and the outer edge of the expansion bowl fits with the inner wall of the sleeve to generate axial friction, thereby limiting the axial position of the clamping part and the workpiece, the tighter the pull rope is pulled, the greater the friction, and the more firmly the clamping part and the workpiece are fixed; when the pull rope is in a loose state, the squeezing force between the two adjacent hemispherical bowls and the expansion bowl disappears, and at this time, the clamping part and the workpiece position can be adjusted by the relative movement between the superimposed and serially connected hemispherical bowls. It can be seen that the present invention realizes the limitation of the position of the clamped workpiece through the cooperation of the universal adjustment mechanism and the tensioning positioning mechanism, has the characteristics of occupying less space and being easy to operate. The hemispherical string universal positioning clamp described in the present invention meets the requirement of fixing the operating lever in the neutral position during the maintenance of the aircraft control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the AA section structure;

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle BB section;

[0020] Figure 4 It is a schematic diagram of the cross-section structure of a hemispherical bowl;

[0021] Figure 5 yes Figure 4 A top view of

[0022] Figure 6 is a schematic diagram of the cross-sectional structure of the expansion bowl;

[0023] Figure 7 yes Figure 6 A top view of

[0024] Figure 8 It is a schematic diagram of the cross-sectional structure of the tensioning screw sleeve;

[0025] Fig. 9 yes Figure 8 Schematic diagram of the CC cross-section structure;

[0026] Fig.10 It is a schematic diagram of the working principle of the tensioning and positioning mechanism of the present invention;

[0027] Fig.11 yes Fig.10 The enlarged view of the structure at position I in the middle;

[0028] Fig.12 It is a schematic diagram of the present invention for adjusting the position of the clamping portion and the workpiece.

[0029] The list of reference numbers in the figure is:

[0030] 1. Left clamp; 2. Locking bolt; 3. Locking nail; 4. Right clamp; 5. Elastic protective pad; 6. Fixing pin; 7. Pin shaft; 8. Connector; 9. Hemispherical bowl; 9-1. First tightening hole; 9-2. First center positioning hole; 9-3. Limiting flange; 10. Pull rope; 11. Hemispherical bowl seat; 12. Expansion bowl; 12-1. Second tightening hole; 12-2. Second center hole; 12-3. Opening groove; 13. Sleeve; 14. Tightening bolt; 14-1. Fixed seat; 14-2. External thread; 14-3. Slide groove; 14-4. Pull rope avoidance groove; 15. Handwheel; 16. Slip ring; 17. Screw; 18. Tension block; 19. Pull rope fixing top screw; 20. Bottom plate; 21. Base; 22. Workpiece. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] See also Figure 1 , Figure 2 The present invention is a hemispherical string type universal positioning fixture, including a clamping mechanism, a connector, a universal adjustment mechanism, a tensioning positioning mechanism and a supporting mechanism. The clamping mechanism includes a left clamping member 1, a right clamping member 4, a locking bolt 2 and a locking nail 3; one end of the left clamping member 1 and the right clamping member 4 are hingedly assembled through a pin shaft 7 installed on the connector 8, and an elastic protective pad 5 is arranged on the inner wall of the left clamping member 1 and the right clamping member 4; the locking bolt 2 passes through the other end of the left clamping member 1 and the right clamping member 4, and fixes the left clamping member 1 and the right clamping member 4 through the locking nail 3; after the workpiece 22 is fixedly clamped by the left clamping member 1 and the right clamping member 4, the left clamping member 1 and the right clamping member 4 are fixedly connected to the connector 8 through the fixing pin 6. The supporting mechanism includes a base plate 20 and a sleeve 13, the base plate 20 is fixed on a base 21 at the work site, and the outer wall of the sleeve 13 is welded and assembled with the base plate 20.

[0033] See also Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7The hemispherical string universal positioning fixture of the present invention has a universal adjustment mechanism with a plurality of hemispherical bowls 9 and expansion bowls 12 superimposed and connected in series. The bottom surface of the hemispherical bowl 9 is provided with a first central positioning hole 9-2 and a first tensioning hole 9-1. The inner and outer spherical surfaces of two adjacent hemispherical bowls 9 form a friction joint surface. The open end of the hemispherical bowl 9 is provided with a limiting flange 9-3. A hemispherical bowl seat 11 is provided between the hemispherical bowl 9 and the expansion bowl 12. The inner wall structure of the hemispherical bowl seat 11 matches the outer surface structure of the hemispherical bowl 9. A center hole and a pull rope passing hole are provided at the bottom of the hemispherical bowl seat 11. The bottom surface of the expansion bowl 12 is provided with a second central positioning hole 12-2 and a second tensioning hole 9-1, and a group of radially radiating opening grooves 12-3 are provided on the side wall of the expansion bowl 12. The sleeve 13 in the support mechanism is sleeved on the outside of the expansion bowl 12 and the hemispherical bowl seat 11. The outer edge of the expansion bowl 12 is a square structure, and the inner wall of the sleeve 13 matches the shape of the outer edge of the expansion bowl 12.

[0034] See also Figure 1 , Figure 8 , Fig. 9 The hemispherical string universal positioning fixture of the present invention has a tensioning and positioning mechanism including a drawstring 10 and a tensioning assembly. The drawstring 10 passes through a first tensioning hole 9-1 on the bottom of each hemispherical bowl 9, a drawstring passing hole at the bottom of the hemispherical bowl seat 11, and a second tensioning hole 12-1 on the bottom of each expansion bowl. One end of the drawstring 10 is fixed to the connector 8 to form a closed rope loop, and the other end of the rope loop cooperates with the tensioning assembly to control the tension state of the drawstring 10 through the tensioning assembly. The tensioning assembly includes a tensioning screw sleeve 14, a hand wheel 15, a slip ring 16, a tension block 18 and a pull rope fixing top screw 19; a fixing seat 14-1 is provided at one end of the tensioning screw sleeve 14, and an external thread 14-2 cooperating with the hand wheel 15 is provided on the side wall of the other end, and a slide groove 14-3 is axially provided on the side wall with the external thread, and the fixing seat 14-1 is embedded in the sleeve 13 of the supporting mechanism in an interference fit manner; the hand wheel 15 is sleeved on the external thread part of the tensioning screw sleeve 14; the slip ring 16 is The slip ring 16 is mounted on the outside of the tensioning screw sleeve 14 in a clearance-fit manner and is located on one side of the handwheel 15. The slip ring 16 is fixedly assembled with the tension block 18 by a screw 17 passing through the slide groove 14-3. The tension block 18 is placed in the tensioning screw sleeve 14, and a pull rope fixing top screw 19 is installed on the tension block 18. The inner wall of the tensioning screw sleeve 14 is provided with pull rope avoidance grooves 14-4 which are symmetrically arranged on the left and right. The pull rope 10 passes through the pull rope avoidance grooves 14-4 and is fixed in the slot of the tension block 18 by the pull rope fixing top screw 19.

[0035] See also Fig.10 , Fig.11 , Fig.12The hemispherical string universal positioning fixture of the present invention is provided with a plurality of hemispherical bowls 9 and expansion bowls 12 superimposed and connected in series in the universal adjustment mechanism. The pull rope 10 in the tensioning positioning mechanism is passed through the first tensioning hole 9-1 on the bottom surface of the hemispherical bowl 9, the pull rope passing hole at the bottom of the hemispherical bowl seat 11 and the second tensioning hole 12-1 on the bottom surface of the expansion bowl 12, and the slip ring 16 is pushed to move axially by rotating the hand wheel 15 in the tensioning positioning mechanism. Since the slip ring 16 is fixedly assembled with the tension block 18 by the screw 17 passing through the slide groove 14-3, when the slip ring 16 moves away from the sleeve 13, it drives the tension block 18 to move, so that the pull rope 10 is in a tensioned state. At this time, the inner and outer spherical surfaces of the two adjacent hemispherical bowls 9 squeeze each other to generate friction, thereby preventing the relative movement between the two, and at the same time, the relative movement between the two adjacent expansion bowls 12 The mutual extrusion produces elastic deformation, and the outer edge of the expansion bowl 12 fits against the inner wall of the sleeve 13, generating axial friction, thereby limiting the axial position of the clamping part and the workpiece 22. The tighter the pull rope 10 is pulled, the greater the friction, and the more firmly the position of the clamping part and the workpiece 22 is fixed; when the slip ring 16 moves toward the sleeve 13, it drives the tension block 18 to move, so that the pull rope 10 is in a loosened state, and the extrusion pressure between the two adjacent hemispherical bowls 9 and the expansion bowl 12 disappears. At this time, the position of the clamping part and the workpiece 22 can be adjusted by the relative movement between the superimposed and series-connected hemispherical bowls 9. During the adjustment process, the limit flange 9-3 of the hemispherical bowl 9 limits the range of relative movement between the two adjacent hemispherical bowls. The accumulation of the relative movement trajectories of several hemispherical bowls 9 meets the requirements for universal adjustment of the position of the clamping part and the workpiece 22.

Claims

1. A hemispherical string universal positioning fixture, characterized in that: It comprises a clamping mechanism, a connector, a universal adjustment mechanism, a tensioning and positioning mechanism and a supporting mechanism; the clamping mechanism is used to clamp a workpiece and is connected to the universal adjustment mechanism via a connector (8); the universal adjustment mechanism is provided with a plurality of hemispherical bowls (9) and expansion bowls (12) which are stacked and connected in series; the bottom surface of the hemispherical bowl (9) is provided with a first central positioning hole (9-2) and a first tensioning hole (9-1); the inner and outer spherical surfaces of two adjacent hemispherical bowls (9) form a frictional engagement surface; between the hemispherical bowl (9) and the expansion bowl (12) ) is provided with a hemispherical bowl seat (11), the bottom surface of the expansion bowl (12) is provided with a second central positioning hole (12-2) and a second tightening hole (12-1), and a group of radially radiating opening grooves (12-3) are provided on the side wall of the expansion bowl (12); the tightening positioning mechanism is equipped with a universal adjustment mechanism, and the position of the clamping mechanism is fixed by the tightening positioning mechanism and the universal adjustment mechanism; the supporting mechanism is used to fix the hemispherical string type universal positioning fixture on the base (21) at the work site; The tensioning and positioning mechanism comprises a drawstring (10) and a tensioning assembly, wherein the drawstring (10) passes through a first tensioning hole (9-1) on the bottom surface of each hemispherical bowl (9), a drawstring passing hole on the bottom of the hemispherical bowl seat (11), and a second tensioning hole (12-1) on the bottom surface of each expansion bowl, one end of the drawstring (10) is fixed on the connector (8) to form a closed rope loop, and the other end of the rope loop cooperates with the tensioning assembly, and the tension state of the drawstring (10) is controlled by pulling the assembly into the drawstring assembly; The tensioning assembly comprises a tensioning screw sleeve (14), a hand wheel (15), a slip ring (16), a tension block (18) and a pull rope fixing top screw (19); a fixing seat (14-1) is provided at one end of the tensioning screw sleeve (14), an external thread (14-2) cooperating with the hand wheel (15) is provided on the side wall at the other end, and a sliding groove (14-3) is axially provided on the side wall provided with the external thread; the fixing seat (14-1) is embedded in the sleeve of the support mechanism in an interference fit manner (13); the hand wheel (15) is sleeved on the external threaded portion of the tensioning screw sleeve (14); the slip ring (16) is sleeved on the outside of the tensioning screw sleeve (14) in a clearance fit manner and is located on one side of the hand wheel (15); the slip ring (16) is fixedly assembled with the tension block (18) by a screw (17) passing through the slide groove (14-3); the tension block (18) is placed in the tensioning screw sleeve (14), and a pull rope fixing top screw (19) is installed on the tension block (18).

2. The hemispherical string universal positioning fixture according to claim 1 is characterized in that: The opening end of the hemispherical bowl (9) is provided with a limiting flange (9-3).

3. The hemispherical string universal positioning fixture according to claim 1 or 2, characterized in that: The support mechanism comprises a bottom plate (20) and a sleeve (13), wherein the bottom plate (20) is fixed on a base (21) at a work site, and the sleeve (13) is sleeved on the outside of the expansion bowl (12) and the hemispherical bowl seat (11), and the outer wall of the sleeve (13) is welded and assembled with the bottom plate (20).

4. The hemispherical string universal positioning fixture according to claim 3 is characterized in that: The outer edge of the expansion bowl (12) is in a square structure, and the inner wall of the sleeve (13) matches the shape of the outer edge of the expansion bowl (12).

5. The hemispherical string universal positioning fixture according to claim 1 is characterized in that: The inner wall of the tensioning screw sleeve (14) is provided with rope avoidance grooves (14-4) arranged symmetrically on the left and right. The rope (10) passes through the rope avoidance grooves (14-4) and is fixed in the slot of the tension block (18) by a rope fixing top screw (19).

6. The hemispherical string universal positioning fixture according to claim 1 is characterized in that: The clamping mechanism comprises a left clamping member (1), a right clamping member (4), a locking bolt (2) and a locking pin (3); one end of the left clamping member (1) and the right clamping member (4) are hingedly assembled via a pin (7) mounted on a connecting head (8); the locking bolt (2) passes through the other ends of the left clamping member (1) and the right clamping member (4) and fixes the left clamping member (1) and the right clamping member (4) via the locking pin (3).

7. The hemispherical string type universal positioning fixture according to claim 6 is characterized in that after the workpiece (22) is fixedly clamped by the left clamping member (1) and the right clamping member (4), the left clamping member (1) and the right clamping member (4) are fixedly connected to the connecting head (8) through a fixing pin (6).

8. The hemispherical string universal positioning fixture according to claim 7 is characterized in that: Elastic protective pads (5) are provided on the inner side walls of the left clamping piece (1) and the right clamping piece (4).

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