Inertial measurement assembly rotary table

Abstract

The invention belongs to the field of tool design, and relates to an inertial measurement assembly turntable. The rotary table comprises a connecting plate, a rotary disc assembly, a fork lug plate, a hand wheel lead screw assembly, a supporting rod, a frame, a base plate and movable wheels. A frame is installed on the chassis. A pair of supporting rods is arranged on the top face of the frame. The lower end of the hand wheel lead screw assembly is fixedly connected with the top face of the frame. Three fork lugs are arranged on the lower bottom face of the fork lug plate, the connecting lines of the three fork lugs form an isosceles triangle, the fork lugs located at the two bottoms of the isosceles triangle are hinged to the top end of the supporting rod, and the fork lug located at the vertex of the isosceles triangle is hinged to the upper end of the hand wheel lead screw assembly. The hand wheel lead screw assembly can vertically ascend and descend so as to jack up or lower one end of the fork lug plate. The connecting plate is installed on the fork lug plate through the rotating disc assembly. The rotating disc assembly can drive the connecting plate to rotate on the plane where the connecting plate is located. And a group of inertial measurement units are mounted on the connecting plate.

Description

Technical Field

[0001] The invention belongs to the field of tooling design and relates to an inertial measurement component turntable. Background Art

[0002] Before the helicopter test flight, a ground power-on test of the flight control system is required. One of the tests is to test the rotation direction of the sensor in the inertial measurement unit when the helicopter pitches, rolls, and yaws, and to check whether the automatic tilt device or the main rotor, tail rotor slide barrel, or tail rotor blades perform the corresponding actions normally.

[0003] The power-on test of aircraft inertial navigation is very necessary, which directly affects the flight accuracy. At present, there are three sets of independently operated inertial navigation systems on general aircraft. Most of the inertial measurement units are used at the same time. Two or more inertial measurement units are coordinated and compared with each other. If the actions are not completely consistent, the main inertial navigation system is directly started to work. If there is a problem with the main inertial navigation system again, the backup inertial navigation system is started to ensure the stability and controllability of the flight status.

[0004] In order to complete the ground power-on test of the inertial measurement unit's functions, an inertial measurement unit turntable needs to be designed. Summary of the invention

[0005] Purpose of the invention: The present invention installs the inertial measurement unit on a turntable. In a static state, the platform is basically parallel to the horizontal plane. The turntable can provide pitch, roll and heading movements of the aircraft. The rotation angle in each direction is more than 10°. The inertial measurement unit turntable is required to be simple and light, and flexible and controllable in operation.

[0006] Technical Solution

[0007] Provided is an inertial measurement assembly turntable, comprising: a connecting plate, a rotating disk assembly, a fork ear plate, a handwheel screw assembly, a support rod, a frame, a chassis, and a movable wheel;

[0008] A frame is installed on the chassis, and a pair of support rods are arranged on the top surface of the frame; a handwheel screw rod assembly passes through the top surface of the frame, and the lower end is fixedly connected to the top surface of the frame; three fork ears are arranged on the lower bottom surface of the fork ear plate, and the connecting line of the three fork ears forms an isosceles triangle, the fork ears located at the two bottoms of the isosceles triangle are hinged to the top end of the support rod, and the fork ears located at the vertices of the isosceles triangle are hinged to the upper end of the handwheel screw rod assembly; the handwheel screw rod assembly can be lifted vertically, so as to lift or lower one end of the fork ear plate; the connecting plate is installed on the fork ear plate through the rotating disk assembly; the rotating disk assembly can drive the connecting plate to rotate in the plane where the connecting plate itself is located; a group of inertial measurement units are installed on the connecting plate.

[0009] Further, the rotating disk assembly includes: a rotating shaft, a first bearing, a bearing seat, a backing plate, an adapter plate, and a first bolt;

[0010] The rotating shaft is located at the top layer, with a flange at the upper end, and is bolted to the connecting plate through the flange; a first bearing is sleeved outside the rotating shaft, the rotating shaft is fitted with the inner ring of the first bearing, the bearing seat is fitted with the outer ring of the first bearing, the bottom end of the bearing seat is connected to the adapter plate by bolts, the backing plate is located below the rotating shaft and is fixed to the rotating shaft by the first bolt, and the overlap between the backing plate and the bearing seat ensures that the rotating disc assembly is fixed without loosening. The adapter plate is in a square frame shape and is located at the bottommost part. The central groove of the adapter plate accommodates the backing plate, and the adapter plate is connected to the bearing seat and the fork ear plate.

[0011] Further, the fork ear holes located at the two bottoms of the isosceles triangle are designed as circular connection holes; the fork ear hole located at the vertex of the isosceles triangle is designed as a waist-shaped connection hole.

[0012] Further, the handwheel screw rod assembly includes a handwheel, a second bearing, a sleeve, a screw rod, a gasket, and a second bolt. The handwheel is located at the upper part of the handwheel screw rod assembly and is welded by a rotating disc and a nut, and is connected to the screw rod through the T-shaped thread inside the nut. The sleeve is located below the handwheel and is in the shape of a socket wrench, with a T-shaped thread machined in the middle, and a notch is milled on the upper surface to cooperate with the nut of the handwheel. A second bearing is installed inside the sleeve and is connected to the screw rod through the T-shaped thread; the lower part of the screw rod has a thread and is connected to the gasket through the second bolt.

[0013] Further, the frame is located on the chassis, bolted to the support rod and welded to the sleeve. It is in an overall cuboid shape and is welded by square steel pipes, with steel plates welded on the upper and lower parts. The upper steel plate is provided with a round hole groove and a threaded hole, which cooperate with the sleeve through the round hole groove and are bolted to the support rod through the threaded hole. The lower steel plate is provided with a clearance hole and is bolted to the chassis, and relief holes are opened on the upper and lower steel plates.

[0014] Further, the turntable further includes: movable wheels with a braking function are installed on the lower end surface of the chassis.

[0015] Further, the inertial measurement unit is installed on the connecting plate through spring washers, flat washers and third bolts;

[0016] The rotating disc assembly is installed on the fork ear plate through spring washers, flat washers and third bolts.

[0017] Further, the opening pin and the pin with hole cooperate with the waist-shaped connection hole to achieve hinged connection.

[0018] Beneficial effects:

[0019] To complete the ground power-on test of the inertial measurement component, an inertial measurement component turntable needs to be designed. The inertial measurement component is installed on the turntable. In the static state, the platform is basically parallel to the horizontal plane. The turntable can provide the pitching, rolling and yaw motions of the aircraft, and the rotation angle in each direction is more than 10°. It is required that the inertial measurement component turntable is simple, light, and flexible and controllable in operation. Description of the Drawings

[0020] Figure 1 The structure diagram of an inertial measurement unit turntable is shown in FIG. 1, a connecting plate, 2, a rotating disk assembly, 3, a fork ear plate, 4, a handwheel screw assembly, 5, a screw, 6, a frame, 7, a chassis, 8, a movable wheel, 9, a third bolt, 10, a spring washer, 11, a flat washer, 12, a hole pin, and 13, a hole pin.

[0021] Figure 2 It is a structural schematic diagram of the rotating disk assembly, wherein 2-1 is the rotating shaft, 2-2 is the first bearing, 2-3 is the bearing seat, 2-4 is the pad, 2-5 is the adapter plate, and 2-6 is the first bolt.

[0022] Figure 3 The schematic diagram of the structure of the hand wheel screw assembly includes 4-1 hand wheel, second bearing 4-2, 4-3 sleeve, 4-4 screw rod, 4-5 gasket, and 4-6 bolt. DETAILED DESCRIPTION

[0023] The present invention provides an inertial measurement unit turntable, such as Figure 1 As shown, the whole is composed of a connecting plate 1, a rotating disk assembly 2, a fork ear plate 3, a handwheel screw assembly 4, a support rod 5, a frame 6, a chassis 7, a movable wheel 8, a third bolt 9, a spring washer 10, a flat washer 11, a perforated pin 12, a perforated pin 13, etc.

[0024] The connecting plate 1 is located at the top of the inertial measurement unit turntable. It is a rectangular steel plate with evenly arranged threaded holes for connecting with the inertial measurement unit. The threaded holes are of different sizes and are staggered on the connecting plate for common inertial measurement units of different styles. Threaded holes for connecting with the rotating disk unit 2 are also arranged on the connecting plate. In the non-working area, lightening holes are arranged to reduce the mass of the device.

[0025] like Figure 2 As shown, the rotating disk assembly 2 is located below the connecting plate 1 and is connected to the connecting plate 1 by bolts, and includes a rotating shaft 2-1, a first bearing 2-2, a bearing seat 2-3, a pad 2-4, an adapter plate 2-5, and bolts 2-6. The rotating shaft 2-1 is located at the uppermost layer, and is bolted to the connecting plate 1 through a flange surface and cooperates with the inner ring of the first bearing 2-2. The bearing seat 2-3 cooperates with the outer ring of the first bearing 2-2 and is connected to the adapter plate 2-5 by bolts. The pad 2-4 is located below the rotating shaft 2-1 and is fixed to the rotating shaft 2-1 by bolts. The pad 2-4 overlaps the bearing seat 2-3 to ensure that the rotating disk assembly 2 is fixed and not loose. The adapter plate 2-5 is in the shape of a U-shaped letter and is located at the bottom. It is connected to the bearing seat 2-3 and the fork ear plate 3.

[0026] The fork ear plate 3 is a rectangular steel plate welded or screwed with three fork ears, and the three fork ears are arranged in an isosceles triangle, wherein the fork ear at the top position of the isosceles triangle is designed with a waist-shaped hole, and the two fork ears at the two bottom positions are designed with circular connecting holes.

[0027] like Figure 3 As shown, the handwheel screw assembly 4 includes a handwheel 4-1, a second bearing 4-2, a sleeve 4-3, a screw 4-4, a gasket 4-5, and a bolt 4-6. The handwheel 4-1 is located at the upper part of the handwheel screw assembly 4, and is welded by a rotating disk and a nut, and is connected to the screw 4-4 through a T-shaped thread in the nut. The sleeve 4-3 is located below the handwheel 4-1 and is in the shape of a socket wrench. A T-shaped thread is machined in the middle, and a notch is milled on the top to match the nut of the handwheel 4-1. The second bearing 4-2 is installed inside the sleeve, and is connected to the screw 4-4 through a T-shaped thread; the lower part of the screw 4-4 has a thread connected to the gasket 4-5 through a bolt 4-6.

[0028] There are two support rods 5, one end of which is connected to the fork ear plate 3, and the other end is fixed to the frame 6 by bolts.

[0029] The frame 6 is located on the chassis 7, fixed with the support rod 5 by bolts, and fixed by welding with the sleeve 4-3. It is in the shape of a rectangular parallelepiped as a whole and is welded from square steel pipes. Steel plates are welded on the upper and lower parts. The upper steel plate is provided with a circular hole groove and a threaded hole, which cooperates with the sleeve 4-3 through the circular hole groove and is connected to the support rod 5 by bolts through the threaded hole. The lower steel plate is provided with a light hole and is connected and fixed with the chassis 7 by bolts. The upper and lower steel plates are provided with lightening holes.

[0030] The chassis 7 is located at the lower part of the overall structure and is circular in shape. It is provided with lightening holes and bolt connection holes for connecting with the frame 6 and the movable wheel 8 .

[0031] The movable wheel 8 is provided with a brake and is connected and fixed to the chassis 7 by bolts.

[0032] The turntable can provide the aircraft with pitch, roll and heading rotation, with a simple and light structure and continuously adjustable angle.

[0033] The overall structure is simple and ingenious. A two-layer motion structure is used to realize the above three-directional rotation. To realize the rotation in three directions, a three-layer motion structure is conventionally designed to complete the above functions. Now the action is decomposed, and the heading (horizontal plane rotation) function is designed at the top layer. The pitch and roll functions are combined and realized by a motion structure, that is, before pitching and rolling, the heading angle of the top layer is adjusted, and then the pitch and roll actions are performed;

[0034] The functional structure is novel and effective. It adopts the structure of tripod ears + screw rod to realize the function of hinge (door axis) to achieve pitch and roll operations. The tripod ears are arranged in an isosceles triangle. The structure is stable and reliable and will not deflect. During the lifting process of the screw rod, the angle can be stopped at any time, and there is no need to use a pin to fix the bearing when it rotates.

[0035] The turntable has good versatility. The 1 connecting plate and the 2 rotating disk assemblies are connected by bolts. Common inertial measurement component connection ports are designed on them. When other unconventional inertial measurement components need to be tested, only a new 1 connecting plate needs to be remade to meet the test of other special models of inertial measurement components.

[0036] The turntable can provide the aircraft with pitch, roll and heading rotation. It has a simple and lightweight structure and its angle can be continuously adjusted and fixed, meeting the needs of ground power-on debugging of the inertial measurement unit.

[0037] Test method using this turntable:

[0038] Test method: First, push (carry) the inertial measurement unit turntable onto the aircraft as needed, fix the inertial measurement (unit) assembly to the connecting plate 1 with screws, make preparations before the test according to technical conditions, rotate the rotating disk assembly 2 to make the inertial measurement (unit) assembly rotate in the plane where the connecting plate 1 is located, and test whether the inertial measurement (unit) assembly functions normally when the aircraft makes heading movements. After completing the heading function test, return the inertial measurement unit turntable. Figure 1 In the initial position shown, the handwheel 4-1 of the handwheel screw assembly 4 is rotated to make the inertial measurement (unit) assembly rotate around the double fork ear axis of the fork ear plate 3 to test whether the inertial measurement (unit) assembly functions normally when the aircraft rolls. After completing the roll function test, the handwheel 4-1 of the handwheel screw assembly 4 is rotated to make the handwheel screw assembly 4 return to the initial state shown in the figure, the connecting plate 1 is rotated 90°, and the handwheel 4-1 of the handwheel screw assembly 4 is rotated again to make the inertial measurement (unit) assembly rotate around the double fork ear axis of the fork ear plate 3 to test whether the inertial measurement (unit) assembly functions normally when the aircraft pitches. Completing the pitch function test means completing the functional test of the inertial measurement assembly (unit) in all directions of the aircraft.

[0039] The turntable has a simple and light overall structure, and adopts a two-layer motion structure to realize the above-mentioned three-direction rotation. The overall turntable is smaller in size, lighter in weight, and has universal wheels, making it more convenient to push or carry onto an aircraft.

[0040] Single-person operation is simple and convenient, the rotation angle is continuously adjustable and can be paused, the angular rate can be large or small, and the test efficiency is improved. The structure of the tripod ear + lead screw realizes the function of the hinge (door axis) to achieve pitch and roll operations, and the tripod ears are arranged in an isosceles triangle. The structure is stable and reliable and will not deflect. The lead screw is self-locking when lifting and lowering, and the lifting angle can be stopped at any time, without the need for a pin to fix the bearing during rotation.

[0041] The turntable has good versatility and saves tooling costs. The connecting plate and the rotating disk assembly are connected by bolts, and a common inertial measurement component connection port is designed on it. When other unconventional inertial measurement components need to be tested, only a new connecting plate needs to be remade to meet the test of other special models of inertial measurement components.

Claims

1. An inertial measurement unit turntable, characterized in that: Including: Connecting plate (1), rotating disc assembly (2), fork ear plate (3), handwheel screw rod assembly (4), support rod (5), frame (6), chassis (7), movable wheel (8); The chassis (7) is installed with the frame (6), and a pair of support rods (5) are arranged on the top surface of the frame; the handwheel screw rod assembly (4) passes through the top surface of the frame, and the lower end is fixedly connected to the top surface of the frame; three fork ears are arranged on the bottom surface of the fork ear plate (3), and the connection line of the three fork ears is an isosceles triangle. The fork ears located at the two bottoms of the isosceles triangle are hinged to the top ends of the support rods (5), and the fork ear located at the vertex of the isosceles triangle is hinged to the upper end of the handwheel screw rod assembly (4); the handwheel screw rod assembly (4) can be vertically lifted and lowered, so as to lift or lower one end of the fork ear plate (3); the connecting plate (1) is installed on the fork ear plate (3) through the rotating disc assembly (2); the rotating disc assembly (2) can drive the connecting plate to rotate in the plane where the connecting plate itself is located; a group of inertial measurement units are installed on the connecting plate.

2. The turntable according to claim 1, characterized in that: The rotating disc assembly includes: rotating shaft (2-1), first bearing (2-2), bearing seat (2-3), backing plate (2-4), adapter plate (2-5), first bolt (2-6); The rotating shaft (2-1) is located at the top layer, with a flange at the upper end, and is bolted to the connecting plate (1) through the flange; the rotating shaft (2-1) is sleeved with the first bearing (2-2), the rotating shaft (2-1) is fitted with the inner ring of the first bearing (2-2), the bearing seat (2-3) is fitted with the outer ring of the first bearing (2-2), the bottom end of the bearing seat (2-3) is connected to the adapter plate (2-5) by bolts, the backing plate (2-4) is located below the rotating shaft (2-1) and is fixed to the rotating shaft (2-1) by the first bolt (2-6). The backing plate (2-4) and the bearing seat (2-3) are overlapped to ensure that the rotating disc assembly (2) is fixed and does not loosen. The adapter plate (2-5) is in a square shape with a hole in the center and is located at the bottommost part. The central groove of the adapter plate (2-5) accommodates the backing plate (2-4), and the adapter plate (2-5) is connected to the bearing seat (2-3) and the fork ear plate (3).

3. The turntable according to claim 1, characterized in that: The fork ear holes located at the two bottoms of the isosceles triangle are designed as circular connection holes; the fork ear hole located at the vertex of the isosceles triangle is designed as a waist-shaped connection hole, and the length of the waist-shaped hole is adapted to the lifting height of the handwheel screw rod assembly (4).

4. The turntable according to claim 1, characterized in that: The handwheel screw rod assembly (4) includes a handwheel (4-1), a second bearing (4-2), a sleeve (4-3), a screw rod (4-4), a gasket (4-5), and a second bolt (4-6). The handwheel (4-1) is located at the upper part of the handwheel screw rod assembly (4) and is formed by welding a rotating disc and a nut, and is connected to the screw rod (4-4) through the T-shaped thread in the nut. The sleeve (4-3) is located below the handwheel (4-1) and is in the shape of a socket wrench, with a T-shaped thread machined in the middle, and a notch is milled on the upper part to cooperate with the nut of the handwheel (4-1). The second bearing (4-2) is installed inside the sleeve, and is connected to the screw rod (4-4) through the T-shaped thread; the lower part of the screw rod (4-4) has a thread and is connected to the gasket (4-5) through the second bolt (4-6).

5. The turntable according to claim 1, characterized in that: The frame (6) is located on the chassis (7), fixed to the support rod (5) by bolts, and fixed to the sleeve (4-3) by welding. The frame (6) is in the shape of a rectangular parallelepiped as a whole, and is welded from square steel pipes. Steel plates are welded to the upper and lower parts of the frame. The upper steel plate is provided with a circular hole groove and a threaded hole, and is matched with the sleeve (4-3) through the circular hole groove, and is connected to the support rod (5) by bolts through the threaded hole. The lower steel plate is provided with a light hole and is connected to the chassis (7) by bolts. The upper and lower steel plates are provided with lightening holes.

6. The turntable according to claim 1, characterized in that: The turntable also includes: a movable wheel (8) with a braking function is installed on the lower end surface of the chassis (7).

7. The turntable according to claim 1, characterized in that: The inertial measurement unit is mounted on the connecting plate (1) via a spring washer (10), a flat washer (11) and a third bolt (9); The rotating disk assembly (2) is mounted on the fork ear plate (3) via a spring washer (10), a flat washer (11) and a third bolt (9).

8. The turntable according to claim 3, characterized in that: The perforated pin (12) and the pin with a hole (13) cooperate with the waist-shaped connecting hole to achieve hinged connection.

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