A zeroing positioning device for an azimuth ring synchronizer of an inertial platform

Abstract

An inertial platform azimuth ring isolocator zeroing and positioning device comprises a base, a first positioning pin assembly, a second positioning pin assembly and a positioning reference plate assembly; the first positioning pin assembly and the second positioning pin assembly are respectively mounted on the two side walls of the base, and a positioning reference plate assembly is mounted below the second positioning pin assembly; the positioning reference plate assembly cooperates with the positioning reference surface of the inertial platform azimuth ring assembly to calibrate the mechanical zero position of the azimuth frame in the inertial platform azimuth ring assembly and realize the constraint of the rotational freedom of the inertial platform azimuth ring assembly around the X axis; the first positioning pin assembly and the second positioning pin assembly cooperate with the positioning holes of the inertial platform azimuth ring assembly respectively to realize the constraint of the translational freedom of the inertial platform azimuth ring assembly along the X, Y and Z directions and the rotational freedom around the Y and Z axes. The present invention ensures that the azimuth frame is in the mechanical zero position during the zeroing process of the inertial platform azimuth ring isolocator, and meets the zeroing operation requirements of the inertial platform azimuth ring isolocator.

Description

Technical Field

[0001] The invention relates to a positioning device, in particular to a workpiece positioning device suitable for zeroing operation of an azimuth ring synchronizer of an aircraft inertial platform. Background Art

[0002] In order to ensure the output accuracy of the heading and attitude of the aircraft inertial navigation system and ensure flight safety, during the overhaul of the aircraft, it is necessary to adjust the motor zero position of the azimuth ring synchronizer of its inertial platform so that the motor zero position of the azimuth ring synchronizer coincides with the mechanical zero position of the azimuth ring's azimuth frame.

[0003] As attached Figure 1 As shown, an inertial platform azimuth ring assembly 1 of an aircraft has positioning holes 1-1 on both sides of the outer wall of the shell, and a positioning reference surface 1-2 on the bottom side. When the positioning reference surface 1-2 is in a vertical state, the azimuth frame is in a mechanical zero position. When the azimuth ring synchronizer in the inertial platform azimuth ring assembly 1 is zeroed, the mechanical zero position of the azimuth frame must be determined first, and then the motor zero position of the azimuth ring synchronizer can be adjusted. Therefore, it is imperative to optimize the design of a workpiece positioning device that ensures that the reference surface 1-2 in the inertial platform azimuth ring assembly 1 is in a vertical state. Summary of the invention

[0004] The invention provides an inertial platform azimuth ring synchronizer zeroing positioning device, which aims to ensure that the azimuth frame is in the mechanical zero position by calibrating the workpiece positioning reference surface and constraining the six degrees of freedom of the workpiece space, so as to meet the purpose of the inertial platform azimuth ring synchronizer zeroing operation requirements.

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

[0006] An inertial platform azimuth ring synchronizer zeroing positioning device comprises a base, a first positioning pin assembly, a second positioning pin assembly and a positioning reference plate assembly; the base is a "U"-shaped seat, and the first positioning pin assembly and the second positioning pin assembly are respectively mounted on the two side walls of the base, and the positioning reference plate assembly is mounted below the second positioning pin assembly; the positioning reference plate assembly cooperates with the positioning reference surface of the inertial platform azimuth ring assembly to calibrate the mechanical zero position of the azimuth frame in the inertial platform azimuth ring assembly and realize the constraint of the rotational freedom of the inertial platform azimuth ring assembly around the X axis; the first positioning pin assembly and the second positioning pin assembly are horizontally arranged, and they respectively cooperate with the positioning holes on both sides of the inertial platform azimuth ring assembly housing to realize the constraint of the translational movement of the inertial platform azimuth ring assembly in the X, Y and Z directions and the rotational freedom around the Y and Z axes.

[0007] The above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, the positioning reference plate assembly is provided with a positioning reference sleeve, a positioning reference sleeve and an adjusting knob; the front end of the positioning reference sleeve is provided with a positioning reference plate, and the rear end of the inner hole of the positioning reference sleeve is provided with an internal thread of the positioning reference sleeve; the positioning reference sleeve is sleeved in the corresponding assembly hole on the side wall of the base, and the positioning reference sleeve is mounted in the positioning reference sleeve; the adjusting knob is provided with an adjusting part and a knob part, the adjusting part is provided with an external thread of the adjusting part, the adjusting part is inserted into the positioning reference sleeve, and the external thread of the adjusting part and the internal thread of the positioning reference sleeve form a screw nut transmission pair, and the left and right movement of the positioning reference sleeve and the positioning reference plate is realized through the screw nut transmission pair.

[0008] The above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, the positioning reference plate assembly is also provided with a limit guide mechanism, the limit guide mechanism includes a limit pin and a guide groove arranged on the side wall of the positioning reference sleeve; the guide groove is a long groove arranged along the axial direction of the positioning reference sleeve; the limit pin is provided with an external thread, which is mounted in a threaded hole arranged on the side wall of the positioning reference sleeve, and the tail end of the limit pin enters the guide groove.

[0009] The above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, the first positioning pin assembly includes a first positioning pin, a first locking disk, a first sleeve and a first positioning sleeve; the first positioning pin is a stepped cylindrical pin, and a first positioning pin external thread is arranged at its tail; the first sleeve is sleeved in the corresponding assembly hole on the side wall of the base, and the first positioning sleeve is sleeved in the first sleeve; the first positioning sleeve is a stepped sleeve, and a first positioning sleeve external thread is arranged at its tail, and a first positioning sleeve internal thread matching the first positioning pin external thread is arranged in the middle of the inner wall of the first positioning sleeve, and a screw-nut transmission pair is formed by the first positioning sleeve internal thread and the first positioning pin external thread, and the first positioning pin is screwed into or out of the positioning hole on the housing of the inertial platform azimuth ring assembly through the screw-nut transmission pair; the locking hole internal thread of the first locking disk is matched with the first positioning sleeve external thread, and the axial position of the first positioning sleeve is limited by the first locking disk.

[0010] In the above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, a disc end face is arranged at the outer end of the first sleeve, the first sleeve is fixedly assembled with the side wall of the base through the disc end face, and a square through hole is arranged in the center of the disc end face; a first square locking face is arranged in the middle of the first positioning sleeve, and the first square locking face in the middle of the first positioning sleeve cooperates with the square through hole in the sleeve disc end face to limit the first positioning sleeve from rotating around the central axis.

[0011] The above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, the second positioning pin assembly includes a second positioning sleeve, a second locking disk, a lock nut and a second positioning pin; the second positioning sleeve is a stepped sleeve, which is inserted into the corresponding assembly hole on the side wall of the base, and a second square locking surface and a second positioning sleeve external thread are arranged on the outer wall of the second positioning sleeve, and a second positioning sleeve internal thread is arranged in the middle of the inner cavity of the second positioning sleeve; the second positioning pin is sleeved with the second positioning sleeve, and a second positioning pin external thread is arranged at the tail end of the second positioning pin, and the second positioning pin external thread and the second positioning sleeve internal thread cooperate to form a screw nut transmission pair, and the second positioning pin is screwed into or out of the positioning hole on the housing of the inertial platform azimuth ring assembly through the screw nut transmission pair; the second locking disk is sleeved outside the second positioning sleeve, and a square locking hole is provided at its center to cooperate with the second square locking surface of the second positioning sleeve; the lock nut is sleeved on the tail end of the second positioning sleeve, and the axial positioning of the second positioning sleeve is realized by the lock nut cooperating with the second positioning sleeve external thread.

[0012] In the above-mentioned inertial platform azimuth ring synchronizer zeroing positioning device, the second positioning pin assembly is also provided with an anti-loosening gasket, and the anti-loosening gasket is sleeved on the outside of the second positioning sleeve and is located between the second locking disk and the lock nut.

[0013] The present invention is a zeroing positioning device for an inertial platform azimuth ring synchronizer, which can firstly calibrate the mechanical zero position of the azimuth frame in the inertial platform azimuth ring assembly by cooperating the positioning plate assembly with the positioning reference surface of the inertial platform azimuth ring assembly; then, by cooperating the positioning pin assemblies arranged on the left and right with the positioning holes on both sides of the inertial platform azimuth ring assembly, the constraints on the freedom of translation of the inertial platform azimuth ring assembly along the X, Y, and Z directions and rotation around the Y and Z axes are realized; then, the positioning reference plate is axially locked and positioned by the limit pins in the positioning plate assembly, so that the positioning reference plate and the positioning reference surface of the inertial platform azimuth ring assembly are pressed and fixed, so as to realize the constraints on the freedom of rotation of the inertial platform azimuth ring assembly around the X axis. It can be seen that, through the present invention, it is ensured that the azimuth frame of the inertial platform azimuth ring is in the mechanical zero position when the inertial platform azimuth ring synchronizer is zeroing, and the purpose of meeting the requirements of the inertial platform azimuth ring synchronizer zeroing operation is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the inertial platform azimuth ring assembly of the aircraft;

[0015] Figure 2 It is a schematic diagram of the structure of the present invention;

[0016] Figure 3 yes Figure 2 Schematic diagram of the AA section structure;

[0017] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle DD section;

[0018] Figure 5 is an exploded structural schematic diagram of the first positioning pin assembly;

[0019] Figure 6 yes Figure 2 Schematic diagram of the structure of the middle BB section;

[0020] Figure 7 yes Figure 6 Schematic diagram of the EE cross-section structure;

[0021] Figure 8 is an exploded structural diagram of the positioning reference plate assembly;

[0022] Fig. 9 yes Figure 2 Schematic diagram of the CC cross-section structure;

[0023] Fig.10 yes Fig. 9 Schematic diagram of the FF cross-section structure;

[0024] Fig.11 is an exploded structural schematic diagram of the second positioning pin assembly;

[0025] Fig.12 It is a schematic diagram of the working state of the present invention.

[0026] The list of reference numbers in the figure is:

[0027] 1. Inertial platform azimuth ring assembly, 1-1, positioning hole, 1-2, positioning reference surface;

[0028] 2. Inertial platform azimuth ring synchronizer zeroing positioning device

[0029] 2-1, base;

[0030] 2-2, first positioning pin assembly, 2-2-1, first positioning pin, 2-2-1a, first positioning pin external thread, 2-2-2, first locking disk, 2-2-2a, locking hole internal thread, 2-2-3, first sleeve, 2-2-4, first positioning sleeve, 2-2-4a, first square locking surface, 2-2-4b, first positioning sleeve external thread, 2-2-4c, first positioning sleeve internal thread;

[0031] 2-3, positioning reference plate assembly, 2-3-1, adjustment knob, 2-3-1a, external thread of adjustment portion, 2-3-2, positioning reference sleeve, 2-3-2a, threaded hole, 2-3-3, positioning reference sleeve, 2-3-3a, positioning reference plate, 2-3-3b, guide groove, 2-3-3c, internal thread of positioning reference sleeve, 2-3-4, limit pin;

[0032] 2-4, second locating pin assembly, 2-4-1, second locating sleeve, 2-4-1a, second locating sleeve internal thread, 2-4-1b, second square locking surface, 2-4-2, second locking disk, 2-4-2a, square locking hole, 2-4-3, anti-loosening gasket, 2-4-4, lock nut, 2-4-5, second locating pin, 2-4-5a, second locating pin external thread. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] See also Figure 1 , Figure 2 , Fig.12 The present invention provides an inertial platform azimuth ring synchronizer zeroing positioning device 1, which is used for Figure 1 The invention discloses a zeroing operation of a synchronizer in an inertial platform azimuth ring assembly 1 of an aircraft. The inertial platform azimuth ring synchronizer zeroing positioning device 1 comprises a base 2-1, a first positioning pin assembly 2-2, a second positioning pin assembly 2-4 and a positioning reference plate assembly 2-3; the base 2-1 is a "U"-shaped seat, and the first positioning pin assembly 2-2 and the second positioning pin assembly 2-4 are respectively mounted on the two side walls of the base, and a positioning reference plate assembly 2-3 is mounted below the second positioning pin assembly 2-4; the positioning reference plate assembly 2-3 cooperates with the positioning reference surface 1-2 of the inertial platform azimuth ring assembly 1, and is used to calibrate the mechanical zero position of the orientation frame in the inertial platform azimuth ring assembly 1, and realizes the constraint of the rotational freedom of the inertial platform azimuth ring assembly 1 around the X-axis; the first positioning pin assembly 2-2 and the second positioning pin assembly 2-4 are horizontally arranged, and the first positioning pin assembly 2-2 and the second positioning pin assembly 2-4 are respectively aligned with the positioning holes 1-1 on both sides of the shell of the inertial platform azimuth ring assembly 1 The cooperation is used to realize the constraint of the freedom of translation of the inertial platform azimuth ring assembly 1 along the X, Y, and Z directions and rotation around the Y and Z axes.

[0035] See also Figure 2 , Figure 6 , Figure 7 , Figure 8The inertial platform azimuth ring synchronizer zeroing positioning device 1 of the present invention has a positioning reference plate assembly 2-3 provided with a positioning reference sleeve 2-3-3, a positioning reference sleeve 2-3-2, an adjusting knob 2-3-1 and a limiting guide mechanism; the front end of the positioning reference sleeve 2-3-3 is provided with a positioning reference plate 2-3-3a, and the inner wall of the rear end of the positioning reference sleeve 2-3-3 is provided with a positioning reference sleeve internal thread 2-3-3c; the positioning reference sleeve 2-3-2 is sleeved in the corresponding assembly hole on the side wall of the base, and the positioning reference sleeve 2-3-3 is equipped in the positioning reference sleeve 2-3-2; the adjusting knob 2-3-1 is provided with an adjusting portion and a knob portion, and the adjusting portion is provided with an adjusting portion external thread 2-3-1a, and the adjusting portion is provided with an adjusting portion external thread 2-3-1a. The part is inserted into the positioning reference sleeve 2-3-3, and the external thread 2-3-1a of the adjustment part and the internal thread 2-3-3c of the positioning reference sleeve form a screw-nut transmission pair, and the left and right movement of the positioning reference sleeve 2-3-3 and the positioning reference plate 2-3-3a is realized by the screw-nut transmission pair; the limiting guide mechanism includes a limiting pin 2-3-4 and a guide groove 2-3-3b arranged on the side wall of the positioning reference sleeve 2-3-3, and the guide groove 2-3-3b is a long groove arranged along the axial direction of the positioning reference sleeve 2-3-3, the limiting pin 2-3-4 is provided with an external thread, which is mounted in the threaded hole arranged on the side wall of the positioning reference sleeve 2-3-2, and the tail end of the limiting pin 2-3-4 enters the guide groove 2-3-3b.

[0036] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 The inertial platform azimuth ring synchronizer zeroing positioning device 1 described in the present invention, its first positioning pin assembly 2-2 includes a first positioning pin 2-2-1, a first locking disk 2-2-2, a first sleeve 2-2-3 and a first positioning sleeve 2-2-4; the first positioning pin 2-2-1 is a stepped cylindrical pin, and a first positioning pin external thread 2-2-1a is arranged at its tail; the first sleeve 2-2-3 is sleeved in the corresponding assembly hole on the side wall of the base, and the first positioning sleeve 2-2-4 is sleeved in the first sleeve 2-2-3; the first positioning sleeve 2-2-4 is a stepped sleeve, and a first positioning sleeve external thread 2-2-4b is arranged at its tail, and a first positioning sleeve internal thread 2-2-4c matching with the first positioning pin external thread 2-2-1a is arranged in the middle of the inner wall of the first positioning sleeve 2-2-4, and the first positioning sleeve internal thread 2-2-4c and the first positioning pin external thread 2-2-1a are connected by the first positioning sleeve internal thread 2-2-4c and the first positioning pin external thread 2-2-1a. A screw-nut transmission pair is formed, through which the first positioning pin 2-2-1 is screwed into or out of the positioning hole 1-1 on the shell of the inertial platform azimuth ring assembly 1; the internal thread 2-2-2a of the locking hole of the first locking disk 2-2-2 is matched with the external thread 2-2-4b of the first positioning sleeve, and the axial position of the first positioning sleeve 2-2-4 is limited by the first locking disk 2-2-2.

[0037] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 In the inertial platform azimuth ring synchronizer zeroing and positioning device 1 described in the present invention, a disc end face is arranged at the outer end of the first sleeve 2-2-3 in the first positioning pin assembly 2-2, and the first sleeve 2-2-3 is fixedly assembled with the side wall of the base through the disc end face, and a square through hole 2-2-3a is arranged in the center of the disc end face; a first square locking surface 2-2-4a is arranged in the middle of the first positioning sleeve 2-2-4, and the first square locking surface 2-2-4a in the middle of the first positioning sleeve 2-2-4 cooperates with the square through hole 2-2-3a of the sleeve disc end face to limit the first positioning sleeve 2-2-4 from rotating around the central axis.

[0038] See also Figure 2 , Fig. 9 , Fig.10 , Fig.11 The inertial platform azimuth ring synchronizer zeroing positioning device 1 of the present invention, its second positioning pin assembly 2-4 includes a second positioning sleeve 2-4-1, a second locking disk 2-4-2, a lock nut 2-4-4, an anti-loosening gasket 2-4-3 and a second positioning pin 2-4-5; the second positioning sleeve 2-4-1 is a stepped sleeve, which is inserted into the corresponding assembly hole on the side wall of the base, and a second square locking surface 2-4-1b and a second positioning sleeve external thread 2-4-1c are arranged on the outer wall of the second positioning sleeve 2-4-1, and a second positioning sleeve internal thread 2-4-1a is arranged in the middle of the inner cavity of the second positioning sleeve 2-4-1; the second positioning pin 2-4-5 and the second positioning sleeve 2- 4-1 set, a second locating pin external thread 2-4-5a is set at the tail end of the second locating pin 2-4-5, and the second locating pin external thread 2-4-5a cooperates with the second locating sleeve internal thread 2-4-1a to form a screw-nut transmission pair, and the second locating pin 2-4-5 is screwed into or out of the locating hole 1-1 on the shell of the inertial platform azimuth ring assembly 1 through the screw-nut transmission pair; the second locking disk 2-4-2 is sleeved on the outside of the second locating sleeve 2-4-1, and a square locking hole 2-4-2a is provided at the center thereof for cooperating with the second square locking surface 2-4-1b of the second locating sleeve 2-4-1; the lock nut 2-4-4 is sleeved on the tail end of the second locating sleeve 2-4-1, and the axial positioning of the second locating sleeve 2-4-1 is realized by the lock nut 2-4-4 cooperating with the second locating sleeve external thread 2-4-1c, and an anti-loosening gasket 2-4-3 is installed between the second locking disk 2-4-2 and the lock nut 2-4-4.

[0039] See also Figures 1 to 12When performing zeroing of the synchronizer in the inertial platform azimuth ring assembly 1 of the aircraft, the inertial platform azimuth ring assembly 1 can be first placed between the left and right side walls of the base 2-1, and the adjustment knob 2-3-1 in the positioning reference plate assembly 2-3 can be adjusted to make the positioning reference plate 2-3-3a fit with the positioning reference surface 1-2 of the inertial platform azimuth ring assembly 1. At this time, the orientation frame in the inertial platform azimuth ring assembly 1 is in the mechanical zero position; the left and right positions of the first positioning sleeve 2-2-4 in the first positioning pin assembly 2-2 are adjusted, and the inertial platform azimuth ring assembly 1 is clamped between the inner end face of the first positioning sleeve 2-2-4 and the inner end face of the second positioning sleeve 2-4-1 of the second positioning pin assembly 2-4; then the first positioning pin 2-2-1 in the first positioning pin assembly 2-2 and the second positioning pin 2-4-5 in the second positioning pin assembly 2-4 can be adjusted to make the first positioning pin 2-2-1 The first and second positioning pins 2-4-5 are respectively inserted into the positioning holes 1-1 on the left and right sides of the inertial platform azimuth ring assembly 1 to constrain the freedom of translation of the inertial platform azimuth ring assembly 1 along the X, Y, and Z directions and rotation around the Y and Z axes; the limit pins 2-3-4 in the positioning reference plate assembly 2-3 are tightened to axially lock the positioning reference plate 2-3-3a so that the positioning reference plate 2-3-3a is pressed and fixed to the positioning reference surface 1-2 of the inertial platform azimuth ring assembly 1 to constrain the freedom of rotation of the inertial platform azimuth ring assembly 1 around the X axis, thereby completing the determination of the mechanical zero position of the orientation frame in the inertial platform azimuth ring assembly 1; then the inertial platform azimuth ring assembly 1 is powered on to input an excitation signal to detect whether the motor of the azimuth ring synchronizer is in the zero position, and then adjustments are made according to the detection results to make the mechanical zero position of the orientation frame in the inertial platform azimuth ring assembly 1 coincide with the motor zero position.

Claims

1. An inertial platform azimuth ring isolocator zeroing positioning device, characterized in that: The inertial platform azimuth ring isolocator zeroing positioning device (2) comprises a base (2-1), a first positioning pin assembly (2-2), a second positioning pin assembly (2-4) and a positioning reference plate assembly (2-3); the base (2-1) is a "U"-shaped base, and the first positioning pin assembly (2-2) and the second positioning pin assembly (2-4) are respectively mounted on the two side walls of the base, and the positioning reference plate assembly (2-3) is mounted below the second positioning pin assembly (2-4); the positioning reference plate assembly (2-3) and the inertial platform azimuth ring assembly The first positioning pin assembly (2-2) and the second positioning pin assembly (2-4) are arranged horizontally, and they are respectively matched with the positioning holes (1-1) on both sides of the housing of the inertial platform azimuth ring assembly (1), so as to realize the constraint of the freedom of translation of the inertial platform azimuth ring assembly (1) in the X, Y and Z directions and the rotational freedom around the Y and Z axes; The positioning reference plate assembly (2-3) is provided with a positioning reference sleeve (2-3-3), a positioning reference sleeve (2-3-2) and an adjustment knob (2-3-1); a positioning reference plate (2-3-3a) is provided at the front end of the positioning reference sleeve (2-3-3), and a positioning reference sleeve internal thread (2-3-3c) is provided at the rear end of the inner hole of the positioning reference sleeve (2-3-3); the positioning reference sleeve (2-3-2) is sleeved in a corresponding assembly hole on the side wall of the base, and the positioning reference sleeve (2-3 -2) is equipped with a positioning reference sleeve (2-3-3); the adjusting knob (2-3-1) is provided with an adjusting portion and a knob portion, the adjusting portion is provided with an adjusting portion external thread (2-3-1a), the adjusting portion is inserted into the positioning reference sleeve (2-3-3), and the adjusting portion external thread (2-3-1a) and the positioning reference sleeve internal thread (2-3-3c) form a screw nut transmission pair, and the positioning reference sleeve (2-3-3) and the positioning reference plate (2-3-3a) can be moved left and right through the screw nut transmission pair; The first positioning pin assembly (2-2) comprises a first positioning pin (2-2-1), a first locking disk (2-2-2), a first sleeve (2-2-3) and a first positioning sleeve (2-2-4); the first positioning pin (2-2-1) is a stepped cylindrical pin, and a first positioning pin external thread (2-2-1a) is arranged at the tail of the first positioning pin; the first sleeve (2-2-3) is sleeved in a corresponding assembly hole on the side wall of the base, and the first positioning sleeve (2-2-4) is sleeved in the first sleeve (2-2-3); the first positioning sleeve (2-2-4) is a stepped sleeve, and a first positioning sleeve external thread (2-2-4b) is arranged at the tail of the first positioning sleeve (2-2- 4) a first positioning sleeve internal thread (2-2-4c) matched with the first positioning pin external thread (2-2-1a) is provided in the middle of the inner wall, and the first positioning sleeve internal thread (2-2-4c) and the first positioning pin external thread (2-2-1a) form a screw-nut transmission pair, and the first positioning pin (2-2-1) is screwed into or out of the positioning hole (1-1) on the housing of the inertial platform azimuth ring assembly (1) through the screw-nut transmission pair; the locking hole internal thread (2-2-2a) of the first locking disk (2-2-2) is matched with the first positioning sleeve external thread (2-2-4b), and the axial position of the first positioning sleeve (2-2-4) is limited by the first locking disk (2-2-2); The second positioning pin assembly (2-4) comprises a second positioning sleeve (2-4-1), a second locking disk (2-4-2), a lock nut (2-4-4) and a second positioning pin (2-4-5); the second positioning sleeve (2-4-1) is a stepped sleeve, which is inserted into a corresponding assembly hole on the side wall of the base; a second square locking surface (2-4-lb) and a second positioning sleeve external thread (2-4-lc) are provided on the outer wall of the second positioning sleeve (2-4-1), and a second positioning sleeve internal thread (2-4-1a) is provided in the middle of the inner cavity of the second positioning sleeve (2-4-1); the second positioning pin (2-4-5) is inserted into the second positioning sleeve (2-4-1), and a second positioning pin external thread (2-4-5a) is provided at the tail end of the second positioning pin (2-4-5). The pin external thread (2-4-5a) cooperates with the second positioning sleeve internal thread (2-4-1a) to form a screw nut transmission pair, and the second positioning pin (2-4-5) is screwed into or out of the positioning hole (1-1) on the housing of the inertial platform azimuth ring assembly (1) through the screw nut transmission pair; the second locking disk (2-4-2) is sleeved on the outside of the second positioning sleeve (2-4-1), and a square locking hole (2-4-2a) is provided at the center thereof to cooperate with the second square locking surface (2-4-1b) of the second positioning sleeve (2-4-1); the lock nut (2-4-4) is sleeved on the tail end of the second positioning sleeve (2-4-1), and the axial positioning of the second positioning sleeve (2-4-1) is achieved through the lock nut (2-4-4) cooperating with the second positioning sleeve external thread (2-4-1c).

2. The inertial platform azimuth ring isolocator zeroing positioning device according to claim 1, characterized in that: The positioning reference plate assembly (2-3) is also provided with a limit guide mechanism, which comprises a limit pin (2-3-4) and a guide groove (2-3-3b) arranged on the side wall of the positioning reference sleeve (2-3-3); the guide groove (2-3-3b) is a long groove arranged along the axial direction of the positioning reference sleeve (2-3-3); the limit pin (2-3-4) is provided with an external thread and is mounted in a threaded hole arranged on the side wall of the positioning reference sleeve (2-3-2), and the tail end of the limit pin (2-3-4) enters the guide groove (2-3-3b).

3. The inertial platform azimuth ring isolocator zeroing positioning device according to claim 2, characterized in that: A disc end face is arranged at the outer end of the first sleeve (2-2-3), the first sleeve (2-2-3) is fixedly assembled with the side wall of the base through the disc end face, and a square through hole (2-2-3a) is arranged at the center of the disc end face; a first square locking face (2-2-4a) is arranged in the middle of the first positioning sleeve (2-2-4), and the first square locking face (2-2-4a) in the middle of the first positioning sleeve (2-2-4) cooperates with the square through hole (2-2-3a) on the sleeve disc end face to limit the first positioning sleeve (2-2-4) from rotating around the center axis.

4. The inertial platform azimuth ring isolocator zeroing positioning device according to claim 3 is characterized in that: The second positioning pin assembly (2-4) is also provided with an anti-loosening gasket (2-4-3), which is sleeved outside the second positioning sleeve (2-4-1) and is located between the second locking disk (2-4-2) and the lock nut (2-4-4).

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