CN104626192A - Multi-lead-screw linkage repeatable extending satellite-borne mechanism - Google Patents

Abstract

The invention provides a multi-screw linkage repeatable extendable space-borne mechanism, which includes a mounting base, a driving mechanism, a first lead screw, a first screw nut, a first lead screw retaining ring, a second lead screw, a second Screw nut, the second screw retaining ring, the first bushing, the second bushing, the third bushing and the rolling bearing. Among them, the second screw is associated with the first screw through the first nut, the second sleeve is associated with the second screw through the rolling bearing, and the first sleeve is connected with the second screw through the second nut. The first section of the screw is driven by the drive mechanism, and the extension and retraction of the corresponding casing are realized through the linkage between the screw and the nut. The spaceborne mechanism of the present invention has the advantages of compact structure, large load capacity, stable expansion and contraction, good self-support, high precision, easy operation, high reliability, and good environmental adaptability, and can be used as a standard device for the docking and capturing expansion mechanism.

Description

A multi-screw linkage repeatable extension spaceborne mechanism

technical field

The invention belongs to the technical field of space satellite capture, and relates to a multi-screw linkage repeatable extendable spaceborne mechanism.

Background technique

High-orbit satellites play an important role in military and civilian fields such as communications, navigation, early warning, and remote sensing due to their large satellite coverage and relatively slow motion on the ground. Carrying out on-orbit service for high-orbit satellites can prolong the life of the satellite and improve the ability to perform tasks, which is one of the current research hotspots at home and abroad. In the process of on-orbit service for high-orbit satellites, operations such as auxiliary orbit change, fuel supply, attitude control, satellite takeover, and fault repair can be performed on the on-orbit satellite as needed. During this type of operation, the capture mechanism needs to be transported to the vicinity of the target to be captured, thereby providing a favorable operating space for the capture operation.

Existing space extension mechanisms for large-scale deployable antennas, solar panels, and space station extendable trusses mainly use wire rope or single-screw multi-nut retraction release mechanisms. Such extension mechanisms exist in space environments. Phenomena such as incomplete deployment and release or rope jamming are also the main reasons for failures of space deployment mechanisms in recent years.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art, to provide a reusable multi-screw linkage and repeatable extendable spaceborne mechanism, which can realize reliable stretch release and contraction functions, and provide technical support for space exploration .

Technical solution of the present invention is:

A multi-screw linkage repeatable extendable space-borne mechanism, including a mounting seat, a driving mechanism, a first screw, a first screw nut, a first screw retaining ring, a second screw, a second screw nut, The second screw retaining ring, the first bushing, the second bushing, the third bushing, the first rolling bearing and the second rolling bearing, wherein,

The first end of the first lead screw is supported in the installation seat through the first rolling bearing, and the first lead screw can rotate under the drive of the driving mechanism, and the position near the first end of the first lead screw is provided with The first limiting shoulder; the first section of the screw retaining ring set is fixed on the second end of the first section of the screw;

The first thread nut is set on the first lead screw, and it cooperates with the first lead screw, and can be connected with the first limiting shoulder on the first lead screw with the rotation of the first lead screw. Axial movement between the screw rings;

The second lead screw is set outside the first lead screw and is supported by the first lead screw retaining ring and the first screw nut. The first end of the second lead screw is fixedly connected with the first screw nut and can be As the first screw nut moves, a second limiting shoulder is provided on the outer wall of the second screw screw near its first end, and the second screw retaining ring is set and fixed on the second screw screw. on two ends;

The second screw nut is set on the second lead screw, and it cooperates with the second lead screw, and can be connected with the second limit shoulder on the second lead screw with the rotation of the second lead screw. Axial movement between the screw rings;

The first bushing is sleeved on the outside of the second screw, which is supported by the second screw nut and the second screw retaining ring, and the first end of the first bushing is fixedly connected to the second screw nut, which can Move with the second wire mother;

The second section of casing is supported and sleeved on the outside of the first section of casing, and the inner wall of the second section of casing is spaced from the outer wall of the first section of casing; the first end of the second section of casing passes through the second rolling bearing Connect with the first end of the second lead screw so that the second sleeve can move with the second lead screw;

The support sleeve of the third section is sleeved on the outside of the second section of casing, the inner wall of the third section of casing is spaced from the outer wall of the second section of casing, and the first end of the third section of casing is fixedly connected to the mounting base .

Specifically, the retaining ring of the first lead screw is a hollow cylindrical structure, which is fixed on the outer wall of the second end of the first lead screw by screws.

Specifically, the first screw nut is a hollow cylindrical structure, and its inner wall is provided with threads for matching with the first section of the screw; the first end of the second section of the screw is sleeved on the first screw nut, and is connected with The first screw nut is fixedly connected; and the retaining ring of the second lead screw is a hollow cylindrical structure, and is fixed on the outer wall at the second end of the second lead screw by screws.

Specifically, the second nut is a hollow cylindrical structure, and its inner wall is provided with a thread for matching with the second screw; the first end of the first sleeve is sleeved on the outer wall of the second nut, and Fix with screws and the second nut.

Specifically, the second section of casing is supported on the outside of the first section of casing through the first sliding bearing and the second sliding bearing arranged between the second section of casing and the first section of casing; the third section of casing is passed The third sliding bearing and the fourth sliding bearing arranged between the third section of casing and the second section of casing are supported on the outside of the second section of casing.

Specifically, the drive mechanism includes a motor, a first gear and a second gear that are supported and fixed in the mounting seat, wherein the first gear is installed on the output shaft of the motor, and the second gear is sleeved and fixed on the first pitch wire on the first end of the bar, and the first gear meshes with the second gear.

The advantage of the present invention compared with prior art is:

Since the present invention adopts multi-section telescoping screw and multi-section telescoping casing as the basic structure of the stretching mechanism, compared with the traditional wire rope type and single screw multi-nut type telescopic mechanism, it has a more compact structure and a larger load capacity. , Stable expansion and contraction, good self-support, high precision, easy operation, high reliability, good environmental adaptability and so on. The multi-section telescoping tube body structure adopted by the present invention can be applied to various stretching distances and stretching requirements of different bearing capacities without refitting or replacement, so the present invention has good versatility. The multi-screw linkage repeatable extendable space-borne mechanism of the present invention has a multi-segment telescoping screw and a multi-segment telescopic tube body adopting a conjoined sequential transmission design, which can weaken the movement disturbance that occurs during the stretching process and reduce the impact on the system posture. The impact of the control can effectively reduce the failure rate of the stretching mechanism and improve the reliability of the stretching mechanism.

Description of drawings

Figure 1 is an overall assembly diagram of the multi-screw linkage repeatable extendable on-board mechanism of the present invention;

Fig. 2 is a schematic diagram of multi-segment telescoping tubes in the multi-screw linkage repeatable extendable spaceborne mechanism of the present invention;

Fig. 3 is a schematic diagram of multi-segment telescoping screw rods in the multi-screw linkage repeatable extendable spaceborne mechanism of the present invention;

Fig. 4 is a schematic diagram of the multi-screw linkage repeatable extendable spaceborne mechanism of the present invention before deployment;

Fig. 5 is a schematic view of the unfolded state of the multi-screw linkage repeatable extendable on-board mechanism of the present invention.

Detailed ways

The multi-screw linkage repeatable extendable spaceborne mechanism according to the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The key point of the multi-screw linkage repeatable extendable space-borne mechanism of the present invention is to realize the extension and contraction of the mechanism based on the variation relationship of the transmission torque of the multi-segment telescoping screw.

As shown in FIG. 1 , it is an overall assembly diagram of the multi-screw linkage repeatable extendable on-board mechanism of the present invention. The starborne mechanism includes a mounting seat 1, a driving mechanism 2, a first screw nut 3, a first screw nut 4, a first screw retaining ring 5, a second screw screw 6, a second screw nut 7, a second Section screw retaining ring 8 , first section casing 9 , second section casing 10 , third section casing 11 , first rolling bearing 14 and second rolling bearing 20 .

In the present invention, the mounting base 1 is mainly used for: connecting the spaceborne mechanism of the present invention with other related components; supporting the first lead screw 3; fixing the third bushing 11; and supporting the motor fixed. As long as the above functions can be realized, those skilled in the art can design the specific structure of the mounting seat according to actual needs and in combination with known technologies in the art, and are not limited to the structure shown in Figure 1 in the present invention. Therefore, in the present invention The structure of the mount is not described in detail.

The driving mechanism 2 is used to provide driving force to the first lead screw 3 so that the first lead screw 3 can rotate forward or reverse. In the preferred embodiment as shown in Figure 1, the driving mechanism 2 includes a motor 15, a first gear 16 and a second gear 17 supported and fixed in the mounting seat 1, wherein the first gear 16 is installed on the motor 15 On the output shaft, the second gear 17 is sleeved and fixed on the first end of the first lead screw 3 , and the first gear 16 meshes with the second gear 17 . Of course, other drive mechanism arrangements can also be used according to actual needs.

The first end of the first lead screw 3 is supported in the mounting seat 1 through the first rolling bearing 14 . Since the axial length of the star-borne mechanism of the present invention is relatively large, in order to make the first lead screw 3 work smoothly, in the present invention, two bearings are used to support the first lead screw 3 . A first stop shoulder 101 is provided near the first end of the first lead screw 3, which is used to limit the first screw nut that will be described below to prevent it from moving from the first end of the first lead screw. One end is removed. The first joint screw retaining ring 5 is set and fixed on the second end of the first joint screw 3 . On the one hand, the retaining ring of the first lead screw is used to limit the displacement of the first lead screw on the first lead screw, preventing it from moving out from the second end of the first lead screw. On the other hand, the retaining ring of the first lead screw also plays a role in supporting the second lead screw.

The first screw nut 4 is sleeved on the first lead screw 3, and it cooperates with the first lead screw 3, and can be positioned on the first limit platform on the first lead screw 3 with the rotation of the first lead screw 3 Axial movement between the shoulder 101 and the first screw retaining ring 5 .

The second section leading screw 6 is enclosed within the outside of the first section leading screw 3, and is supported by the first section leading screw retaining ring 5 and the first screw nut 4. The first end of the second lead screw 6 is fixedly connected with the first screw nut 4 , so that the second lead screw 6 can move along with the first screw nut 4 . A second limiting shoulder 61 is provided on the outer wall of the second lead screw 6 close to its first end, and the second lead screw retaining ring 8 is set and fixed on the outer wall of the second end of the second lead screw 6 superior. The second limiting shoulder and the second screw retaining ring are used to limit the displacement of the second screw nut 7 on the second screw screw, preventing the second screw nut 7 from the first screw nut of the second screw screw. end or second end removed.

The second screw nut 7 is sleeved on the second lead screw 6, and it cooperates with the second lead screw 6, and can be positioned on the second limit platform on the second lead screw 6 with the rotation of the second lead screw 6 Axial movement between the shoulder 61 and the second screw retaining ring 8 .

The first casing 9 is sleeved on the outside of the second screw 6 and supported by the second screw nut 7 and the second screw retaining ring 8 . The first end of the first bushing 9 is fixedly connected with the second nut 7 , so that the first bushing 9 can move along with the second nut 7 .

The second section of casing 10 is sleeved on the outside of the first section of casing 9 , and the inner wall of the second section of casing 10 is spaced apart from the outer wall of the first section of casing 9 . The first end of the second bushing 10 is connected to the first end of the second screw 6 through the second rolling bearing 20 , so that the second bushing 10 can move with the second screw 6 .

The third section of casing 11 is sleeved on the outside of the second section of casing 10, the inner wall of the third section of casing 11 is spaced from the outer wall of the second section of casing 10, and the first end of the third section of casing 11 is fixedly connected on mount 1.

In the preferred embodiment shown in FIGS. 1-3 , the first lead screw retaining ring 5 is a hollow cylindrical structure, which is fixed on the outer wall of the second end of the first lead screw 3 by screws. The first screw nut 4 is a hollow cylindrical structure, and the inner wall thereof is provided with a screw thread for cooperating with the first lead screw 3 . The first end of the second leading screw 6 is sleeved on the first thread nut 4 . And the first end of the second lead screw 6 is fixedly connected with the first screw nut 4 by screws. The second lead screw retaining ring 8 is a hollow cylindrical structure, and is fixed on the outer wall of the second end of the second lead screw 6 by screws. The second screw nut 7 is a hollow cylindrical structure, and the inner wall thereof is provided with a screw thread for cooperating with the second lead screw 6 . The first end of the first sleeve 9 is sleeved on the outer wall of the second nut 7 and fixed with the second nut 7 by screws. The second section casing 10 is supported on the outside of the first section casing 9 by the first sliding bearing and the second sliding bearing arranged between the second section casing 10 and the first section casing 9; the third section casing 11 is supported outside the second section of casing 10 through the third sliding bearing and the fourth sliding bearing arranged between the third section of casing 11 and the second section of casing 10 .

Those skilled in the art can understand that the aforesaid second rolling bearing is used to realize the linkage between the second bushing 10 and the second lead screw 6 . For this reason, in order to limit the axial position of the second rolling bearing, a corresponding structure may be provided, and such a structure is a well-known technical means in the art, and details will not be described here. Similarly, the aforementioned first to fourth sliding bearings (such as 18 and 19 in the figure) are used to support the second and third bushings and guide their sliding. In order to axially limit the corresponding sliding bearings, sleeve retaining rings (refer to 12 and 13 in the figure) are provided at the second ends of the second section of the sleeve and the third section of the sleeve. Of course, according to the actual situation, copper casing can be used instead. For example, pressing the sleeves respectively on the inner or outer walls of the two ends of the corresponding sleeves, and at the same time restricting and fixing the corresponding sleeves through additional retaining rings is a common technical means in this field and will not be done here. More limited.

The working process of the multi-screw linkage repeatable extendable on-board mechanism according to the present invention is as follows:

1. Unfolding process

When the multi-screw linkage repeatable extension starborne mechanism is extended, the reduction motor 15 drives the first gear to rotate, the first gear drives the second gear to rotate, and then drives the first screw rod 3 to rotate forward, because the second screw rod has not been unlocked , the first nut 4 moves along the first screw rod 3 toward the second end of the first screw rod along with the rotation of the first screw rod 3 . Since the second lead screw 6 is fixedly connected to the first screw nut 4, and the second bushing 10 is connected to the second lead screw 6 through the second rolling bearing 20, the second bushing 10 is connected to the first nut 4 Linkage, so that the second sleeve 10 protrudes from the first sleeve 11, when the first nut 4 stops moving due to the first screw retaining ring 5, the second sleeve 10 is stretched in place . At the same time, the first lead screw 3 continues to rotate forward under the drive of the motor 15, and the second lead screw 6 and the first screw nut 4 rotate together with the first lead screw 3, thus driving the second screw nut 7 moves along the second lead screw 6 toward its second end. Since the first end of the first sleeve 9 is fixedly connected to the second nut 7 , the first sleeve 9 also moves along with the second nut, thereby protruding from the second sleeve 10 . When the second screw nut 7 was stopped due to the second lead screw retaining ring 8, the second sleeve pipe 10 was stretched in place. The unfolded state (that is, stretched in place) of the multi-screw linkage repeatable extendable on-board mechanism of the present invention is shown in FIG. 5 .

2. Shrinkage process

When the multi-screw linkage repeatable extension star-borne mechanism shrinks, the reduction motor 15 reverses, thereby driving the first screw rod 3 to reverse through the first gear and the second gear. Since the second threaded mandrel 6 has not been locked, the first threaded nut 4 moves along the first threaded mandrel toward the first end of the first threaded mandrel along with the rotation of the first threaded mandrel 3 . Since the second lead screw 6 is fixedly connected to the first screw nut 4, and the second bushing 10 is connected to the second lead screw 6 through the second rolling bearing 20, the second bushing 10 is connected to the first nut 4 Linkage, so that the second section of casing 10 retracts into the first section of casing 11, when the first nut 4 stops moving due to the first limiting shoulder 101, the second section of casing 10 retracts to its position . At the same time, the first lead screw 3 continues to reverse under the drive of the motor 15, and the second lead screw 6 and the first screw nut 4 rotate together with the first lead screw 3, thus driving the second screw nut 7 moves along the second lead screw 6 toward its first end. Since the first end of the first sleeve 9 is fixedly connected to the second nut 7 , the first sleeve 9 also moves with the second nut, thereby retracting into the second sleeve 10 . When the second screw nut 7 was stopped due to the second lead screw retaining ring 8, the second sleeve pipe 10 retracted into place. The multi-screw linkage repeatable extendable spaceborne mechanism of the present invention is shown in FIG. 4 in its pre-deployed state (ie retracted state).

As shown in FIG. 2 , it is a schematic diagram of multi-segment telescoping tube bodies in the multi-screw linkage repeatable extendable spaceborne mechanism of the present invention. These tubes mainly play the role of load bearing, expansion and contraction and connection with the aircraft, and are outside the expansion spaceborne mechanism. In a preferred embodiment of the present invention, the on-board mechanism includes three sections of casing.

As shown in FIG. 3 , it is a schematic diagram of multi-segment telescoping screw rods in a multi-screw-linked repeatable extendable spaceborne mechanism of the present invention. The screw rod plays the role of active power transmission and axial force bearing, and a two-section screw rod is used in the preferred embodiment of the present invention.

The multi-screw linkage and repeatable extendable spaceborne mechanism of the present invention: 1. Realize the sequential release and contraction of the screw rods based on the variation relationship of the torque of the multi-section nested screw screws; 2. Through the unlocking timing of the nut on the screw rod Realize the sequential expansion and contraction of the multi-section casing; 3. The multi-section telescopic casing is driven to expand and contract one by one through the high-precision multi-section telescopic screw rod, so as to realize the stable and reliable expansion and contraction of the mechanism.

Here, it should be noted that the content that is not described in detail in this specification can be realized by those skilled in the art through the description of this specification and the prior art, so details are not repeated here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. For those skilled in the art, several modifications and substitutions can be made to the present invention without any creative work, and all these modifications and substitutions should be covered within the protection scope of the present invention.

Claims (6)

1. lead screw linkage more than a kind can repeat to stretch spaceborne mechanism, it is characterized in that, comprise mount pad (1), driving mechanism (2), first segment leading screw (3), the first screw (4), first segment leading screw back-up ring (5), second section leading screw (6), the second screw (7), second section leading screw back-up ring (8), first segment sleeve pipe (9), second section sleeve pipe (10), Section of three sleeve pipe (11), the first rolling bearing (14) and the second rolling bearing (20), wherein

The first end of first segment leading screw (3) is supported in mount pad (1) by the first rolling bearing (14), and first segment leading screw (3) can rotate under the driving of driving mechanism (2), the upper position near its first end of first segment leading screw (3) is provided with the first spacing shoulder (101); First segment leading screw back-up ring (5) suit is fixed on the second end of first segment leading screw (3);

First screw (4) is sleeved on first segment leading screw (3), it coordinates with first segment leading screw (3), and can move axially along with between the first spacing shoulder (101) of the rotation of first segment leading screw (3) on first segment leading screw (3) and first segment leading screw back-up ring (5);

Second section leading screw (6) is enclosed within the outside of first segment leading screw (3) and is supported by first segment leading screw back-up ring (5) and the first screw (4), the first end of second section leading screw (6) is fixedly connected with the first screw (4), can be mobile along with the first screw (4), position near its first end on the outer wall of second section leading screw (6) is provided with the second spacing shoulder (61), and second section leading screw back-up ring (8) suit is fixed on the second end of second section leading screw (6);

Second screw (7) is sleeved on second section leading screw (6), it coordinates with second section leading screw (6), and can move axially along with between the second spacing shoulder (61) of the rotation of second section leading screw (6) on second section leading screw (6) and second section leading screw back-up ring (8);

First segment sleeve pipe (9) is enclosed within the outside of second section leading screw (6), it is supported by the second screw (7) and second section leading screw back-up ring (8), and the first end of first segment sleeve pipe (9) is fixedly connected with the second screw (7), can be mobile along with the second screw (7);

Second section sleeve pipe (10) is sleeved on the outside of first segment sleeve pipe (9), and is spaced between the outer wall of the inwall of second section sleeve pipe (10) and first segment sleeve pipe (9); The first end of second section sleeve pipe (10) is connected with the first end of second section leading screw (6) by the second rolling bearing (20), makes second section sleeve pipe (10) can along with second section leading screw (6) action;

Section three, sleeve pipe (11) is sleeved on the outside of second section sleeve pipe (10), section three, the inwall of sleeve pipe (11) and the outer wall of second section sleeve pipe (10) are spaced, and the first end of Section of three sleeve pipe (11) is fixedly connected on mount pad (1).

2. many lead screw linkage according to claim 1 can repeat to stretch spaceborne mechanism, it is characterized in that, the tubular construction that described first segment leading screw back-up ring (5) is hollow, it is fixed by screws on the outer wall of first segment leading screw (3) second end.

3. many lead screw linkage according to claim 1 can repeat to stretch spaceborne mechanism, it is characterized in that,

The tubular construction that first screw (4) is hollow, its inwall is provided with the screw thread for coordinating with first segment leading screw (3); The first end of second section leading screw (6) is enclosed within the first screw (4), and is fixedly connected with the first screw (4) by screw; And the tubular construction that second section leading screw back-up ring (8) is hollow, and be fixed by screws on an outer ancient piece of jade, round, flat and with a hole in its centre for second section leading screw (6) second end.

4. many lead screw linkage according to claim 1 can repeat to stretch spaceborne mechanism, it is characterized in that,

The tubular construction that second screw (7) is hollow, its inwall is provided with the screw thread for coordinating with second section leading screw (6); The first end of first segment sleeve pipe (9) is enclosed within the outer wall of the second screw (7), and is fixed by screw and the second screw (7).

5. many lead screw linkage according to claim 1 can repeat to stretch spaceborne mechanism, it is characterized in that,

Second section sleeve pipe (10) is supported on the outside of first segment sleeve pipe (9) by being arranged on the first sliding bearing between second section sleeve pipe (10) and first segment sleeve pipe (9) and the second sliding bearing; Section three, sleeve pipe (11) is supported on the outside of second section sleeve pipe (10) by being arranged on the 3rd sliding bearing between Section of three sleeve pipe (11) and second section sleeve pipe (10) and the 4th sliding bearing.

6. many lead screw linkage according to claim 1 can repeat to stretch spaceborne mechanism, it is characterized in that, described driving mechanism (2) comprises the motor (15) be supported and fixed in described mount pad (1), the first gear (16) and the second gear (17), wherein, first gear (16) is arranged on the output shaft of motor (15), second gear (17) suit is fixed on the first end of first segment leading screw (3), and the first gear (16) engages with the second gear (17).