CN203627437U - Locking device of two-dimensional scanning mechanism - Google Patents

Abstract

This patent discloses a locking device for a space two-dimensional scanning mechanism, which is applied in the field of aerospace technology. The locking device includes a base, a block assembly, a pin puller, a rotating body connecting frame and a tension spring. The base is installed on the base of the scanning mechanism, and the stopper assembly, pin puller and tension spring are all installed on the base; one end of the rotating body connecting frame is fixedly connected with the rotating body of the two-dimensional mechanism, and the other end is matched with the pin shaft; the stopper is movable Parts, the rotating shaft is a stopper shaft. When locking, the pin shaft of the pin puller passes through the base bushing, the rotating body connecting frame bushing and the pin shaft bushing, together with the stopper assembly, the rotating body of the mechanism is locked, and the tension spring is in a tensioned state; when unlocking, the pin shaft Pull out, and the stopper returns to the initial position around the stopper shaft under the force of the tension spring to complete the unlocking. The innovation of this patent is to realize the two-dimensional locking of the scanning mechanism by using a locking device. The patent has the advantages of convenient disassembly and assembly, simple structure, safety and reliability, and provides an effective locking method of a spatial two-dimensional scanning mechanism.

Description

Locking device for two-dimensional scanning mechanism

technical field

This patent relates to a locking device for a rotating mechanism, in particular to a locking device for a space two-dimensional scanning mechanism, which belongs to the field of aerospace technology.

Background technique

In order to realize large-scale imaging in space, a two-dimensional scanning method is often used, and the scanning in the azimuth and pitch directions is realized through the two-dimensional swing of the scanning mirror. When the satellite is launched, there will be a large impact and disturbance moment on the two-dimensional scanning mechanism. Therefore, the two-dimensional scanning mechanism must be locked before the satellite is launched to protect the precision shafting and scanning mirror of the scanning mechanism from damage. The locking device of the scanning mechanism is one of the key components of the whole mechanism, and the reliability of locking and unlocking is directly related to the success or failure of the scanning mechanism.

The locking methods of the spatial two-dimensional scanning mechanism include explosive bolt locking, electromagnetic locking, pin puller locking, etc. When the explosion bolt is installed, the two connecting parts are fixed together. After the explosion, the two connecting parts are separated from the separation surface into two parts to unlock. It is often used outside the cabin, and its application in optical instruments is often limited due to factors such as pollution and impact. The characteristic of electromagnetic locking is that a yoke and a braking surface are added, and two sets of locking devices are required to realize two-dimensional locking, which makes the structure relatively complicated. The traditional pin puller locking uses two pin puller devices to achieve two-dimensional locking, especially when the reliability is reduced directly on the scanning mirror. Combined with the application of this patent, one pin puller device is used to realize two-dimensional locking tight.

Contents of the invention

The technical problem solved by this patent is to provide a locking device for a spatial two-dimensional scanning mechanism, and realize the two-dimensional locking of the scanning mechanism through a simple and reliable locking device.

The technical scheme adopted by this patent is as follows:

The locking device of the two-dimensional scanning mechanism of this patent includes a base 1, a stopper assembly 2, a pin puller 3, a rotating body connecting frame 4 and a tension spring 5, wherein the stopper assembly 2 also includes a stopper 6 and a stopper shaft 7 , Block bushing 8, block outer gasket 9, block inner gasket 10, pin bushing 11 and nut 12.

There is a boss mounting foot on the left and right sides of the base 1, and the material is generally selected from titanium alloy, stainless steel, etc., and the circular counterbore in the middle position is embedded in a plastic bushing. Due to the limitation of the working stroke of the pin shaft 14 of the pin puller 3, the base 1 The thickness of the center pin hole is generally less than 1/2 of the working stroke of the pin shaft. The block assembly 2 is a movable part that rotates around the shaft, wherein the block 6 is rectangular in shape as a whole, and rotates around the block shaft 7, and the pin hole is embedded in a plastic pin bushing 11, which is fixed on the block 6 by 4 screws Above, the material of the stopper 6 is generally made of titanium alloy; the two shaft ends of the stopper shaft 7 are locking threads, the shaft is made of metal material resistant to deformation and shearing, and the position of the rotating mating surface requires anti-cold welding treatment; the stopper lining The sleeve 11, the inner gasket 10 of the block, and the outer gasket 9 of the block are generally made of metal materials; the fastening nut 12 is locked by double nuts. The main body of the pin puller 3 is cylindrical, and there are 4 symmetrical mounting holes on the mounting surface. The pin stretches out before unlocking, and retracts after unlocking. The rotating body connecting frame 4 is made of titanium alloy, and the center hole at one end is embedded in a plastic bushing. The extension spring 5 is made of spring steel, and its length and tension should be calculated reasonably according to the actual situation to ensure that the extension spring does not cause the block to rebound after unlocking, and there is a certain tension margin.

The base 1 is the supporting structure of the entire locking device, fixed on the base 17 of the scanning mechanism; the block assembly 2 is integrally installed on the base 1, and is threaded through the shaft end of the block shaft 7, and the block The block 6 rotates around the block shaft 7 under the action of the extension spring 5, wherein one end of the extension spring 5 is connected to the pin bushing 11, and the other end of the extension spring 5 is fixed on the base 1; the pin puller 3 It is fixed on the base 1 by screws. When locking, the pin shaft 14 passes through the mounting holes corresponding to the base bushing 15, the rotating body connecting frame bushing 13 and the pin shaft bushing 11 in turn. After installation, the tension spring 5 is in a tensioned state. One end of the connecting frame 4 of the mechanism rotating body is fixedly connected with the rotating body 18 of the two-dimensional scanning mechanism, and the embedded pin shaft bushing 11 at the other end is connected with the pin shaft 14 in cooperation.

Description of the working principle of locking and unlocking: the two-dimensional scanning mechanism first checks that the stopper 6 is in an active state before locking. 13 and the mounting hole corresponding to the pin bushing 11, then fix the pin puller 3 on the base 1, and tighten the screws to achieve two-dimensional (azimuth and pitch) locking. At this time, the tension spring 5 is in a tensioned state. Through a The combination of the pin puller 3 and the baffle assembly 2 realizes the two-dimensional locking of the scanning mechanism; when unlocking, an unlock command is sent, and the pin shaft 14 of the pin puller 3 is pulled out instantly, and the stopper acts on the force of the extension spring 5 The lower winding shaft returns to the initial horizontal position to realize unlocking, and now the mechanism rotating body 18 is in a free state.

This patent has the following benefits:

1. Simple structure, easy disassembly and assembly, small space occupation and low manufacturing cost;

2. Technological innovation, using a locking device to achieve two-dimensional locking;

3. Passed the ground environment test and satellite launch assessment, successfully locked and unlocked.

Description of drawings

Fig. 1 is a structural schematic diagram of the locking device of the two-dimensional scanning mechanism of the present patent.

Fig. 2 is a diagram illustrating the installation of the locking device of the two-dimensional scanning mechanism of the present patent.

Fig. 3 is a structural schematic diagram of the block assembly of the present patent.

Fig. 4 is a schematic diagram of the locking state of the pin of the pin puller of this patent.

In the figure: 1. base, 2. stopper assembly, 3. pin puller, 4. rotating body connecting frame, 5. extension spring, 6. stopper, 7. stopper shaft, 8. stopper bushing, 9 , Block outer gasket, 10, Block inner gasket, 11, pin bushing, 12, fastening nut, 13, rotating body connection frame bushing, 14, pin shaft, 15, base bushing, 16, Locking device, 17, base, 18, mechanism rotating body.

Detailed ways

The specific implementation of this patent is described further below in conjunction with accompanying drawing:

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the locking device of the two-dimensional scanning mechanism of this patent includes a base 1 , a block assembly 2 , a pin puller 3 , a rotating body connecting frame 4 and a tension spring 5 . The base 1 is made of titanium alloy. Due to the limitation of the working stroke of the pin shaft of the pin puller 3 of 9 mm, the thickness of the pin hole of the base 1 is designed to be 4 mm, and a polyimide base lining is embedded in the circular counterbore through which the pin shaft Φ6 mm passes. Set, unilateral thickness 2mm. The block assembly 2 is fixed on the base by the thread of the block shaft end and the M5 nut, and the rotating shaft is the block shaft 7, and the block 6 rotates freely around the axis under the pulling force of the extension spring 5 when it is not locked. One end of the mechanism rotating body connecting frame 4 is fixedly connected with the scanning mechanism rotating body 18 of the two-dimensional mechanism through 4 M4 titanium alloy screws, and the other end is matched with the pin puller pin 14. The matching hole is Φ10mm, and polyimide is embedded inside The bushing and connecting frame are made of titanium alloy. The pin puller 3 is a pyrotechnic pin puller. The pin shaft 7 protrudes when locked, and retracts without rebounding after unlocking. It is fixed on the base 1 by four M5 anti-loosening screws, and one of the screws is connected to the stopper shaft 7. shared. One end of the extension spring 5 is fixed on the base by M3 screws, and the other end is fixed on the pin bushing 11 on the baffle by M3 screws, sharing one of the mounting screws with the pin bushing 11, wherein the effective length of the extension spring 5 is 30mm and a pulling force of 10N.

After the assembly operation of the above components on the base 1 is completed, the base 1 is fixed on the base 17 of the scanning mechanism through two M5 screws. Before the pin puller 3 is installed, the stopper 6 is in the initial horizontal position under the action of the spring force . The pin shaft 14 of the pin puller 3 passes through the base bushing 15, the rotating body connecting frame bushing 13 and the pin shaft bushing 11 in sequence, and then the pin puller 3 is fixed on the base 1 to realize two-dimensional locking. When the extension spring is in a tensioned state; when the pin shaft 14 of the pin puller 3 is pulled out, the block 6 returns to the initial position around the axis under the force of the extension spring 5 to realize unlocking, and the rotating body 18 of the mechanism is in azimuth and pitch Free movement in both directions.

As shown in Figure 3, the stopper assembly 2 includes a stopper 6, a stopper shaft 7, a stopper bushing 8, a stopper inner gasket 10, a stopper outer gasket 9, a pin bushing 11 and an M5 fastening nut 12. In the implementation of this patent, the stopper 6 is made of titanium alloy, the stopper shaft 7 is 40Cr, the stopper bushing 8, the stopper inner gasket 10 and the stopper outer gasket 9 are made of brass, and the pin bushing 11 is made of polyamide imine material. The pin bushing 11 is fixed on the block 6 by 4 M3 screws, and embedded in the hole of the block. When the stopper assembly 2 is assembled, firstly, ensure that the radial fit clearance between the stopper bushing 8 and the stopper 6 hole is 0.1 mm, and the axial fit clearance between the stopper inner gasket 10, the stopper 6 and the stopper outer gasket 9 It is 0.2mm, and then lock it with M5 double nut 12, and check whether the stopper 6 is active after locking.

As shown in Figure 4, it is the locked state after the pin puller 3 is installed, the pin shaft 14 of the pin puller 3 passes through the holes corresponding to the base bush 15, the rotating body connecting frame bush 13 and the pin bush 11, One of the four M5 screws fixing the pin puller 3 is shared with the block assembly 2 . A gap of 0.1 mm is left between the base 1 and the rotating body connecting frame 4, and a movable gap of 0.1 mm is reserved between the rotating body connecting frame 4 and the stopper 6.

In order to increase the reliability of locking and successful unlocking, the implementation of this patent has adopted the following reliability design measures and environmental test assessment: 1. Use polyimide bushing material; 2. Reserve 10 times the tension margin for the tension spring; 3. , Pass thermal vacuum test, mechanical vibration test, low temperature loading and unlocking test and other assessments.

This patent realizes the two-dimensional locking of the scanning mechanism only through the combination of a pin puller 3 and the baffle assembly 2. It has a simple structure and remarkable features, and provides users with a safe and reliable locking device for the two-dimensional scanning mechanism. .

Claims (5)

1. the locking device of a bidimensional sweep mechanism, comprise base (1), block assembly (2), pin puller (3), rotor link press span (4) and extension spring (5), it is characterized in that, described block assembly (2) comprises block (6), block shaft (7), block lining (8), the outer pad (9) of block, block internal gasket (10), bearing pin lining (11) and nut (12); Described base (1) is the supporting structure of whole locking device, is fixed on the pedestal (17) of sweep mechanism; Described block assembly (2) integral installation is on base (1), axle head by block shaft (7) is threaded, block (6) rotates around block shaft (7) under the effect of extension spring (5), wherein bearing pin lining (11) is connecting one end of extension spring (5) above, and the other end of extension spring (5) is fixed on base (1); Described pin puller (3) is fixed by screws on base (1), in the time of locking, bearing pin (14) is successively through mounting hole corresponding to base lining (15), rotor link press span lining (13) and bearing pin lining (11), and after installing, extension spring (5) is in tension; One end and the bidimensional sweep mechanism rotor (18) of described mechanism's rotor link press span (4) are connected, and the bearing pin lining (11) of the embedding of the other end is connected with bearing pin (14).

2. the locking device of a kind of bidimensional sweep mechanism according to claim 1, is characterized in that, described bearing pin lining (11), rotor link press span lining (13) and base lining (15) material are selflubricating engineering plastics.

3. the locking device of a kind of bidimensional sweep mechanism according to claim 1, is characterized in that, the described outer pad (9) of block lining (8), block, block internal gasket (10) adopt metallic material.

4. the locking device of a kind of bidimensional sweep mechanism according to claim 1, is characterized in that, described pin puller (3) is fire-working article pin puller or solenoid valve pin puller.

5. the locking device of a kind of bidimensional sweep mechanism according to claim 1, it is characterized in that, the radial clearance in described block lining (8) and block (6) hole coordinates, the axial assurance Spielpassung of the outer pad (9) of block, block (6), block internal gasket (10).

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