A scissor deployment mechanism

Abstract

The present application relates to a kind of scissors type unfolding mechanism, top short pole assembly, scissors type level group pole piece unit, bottom support pole assembly, drive unit assembly and unfolding in place indication switch, unfolding mechanism is connected with the unfolded object by top short pole assembly, and multiple levels of scissors type level group pole piece unit is connected by hinge shaft in it to form multiple levels of unfolding mechanism, and long pole of multiple levels of unfolding mechanism is connected in turn;Bottom support pole assembly is connected with drive unit assembly, and drive unit assembly drives bottom support pole assembly to realize the unfolding of unfolding mechanism and folding, and the present application forms stable triangle structure by bottom support pole assembly, scissors type level group pole piece unit and limiting device after unfolding, improves structural rigidity, and controls unfolding mechanism to unfold.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of space vehicle deployment mechanism, and particularly relates to a scissor type deployment mechanism. BACKGROUND

[0002] Deployable mechanism is one of the important research topics in the field of space mechanism, and the scissor type folding and deployment mechanism is widely used in various spacecrafts such as solar wings due to its compact structure and simple principle. The deployment of the mechanism is usually achieved by the relative rotation of the two rods of the scissor unit, and the required deployment length is achieved by connecting multiple scissor units. In order to achieve reliable deployment of the scissor rod unit, the configuration scheme of the scissor rod mechanism needs to be designed, and different configuration schemes affect the deployment driving force characteristics, reliability, stiffness and other performance indicators of the scissor rod mechanism.

[0003] Patent CN 202210924857.7 discloses a scissor type solar wing system, which uses a scissor type deployment mechanism as a flexible solar wing deployment mechanism. The scissor type deployment mechanism includes a scissor rod assembly, a transmission mechanism, a synchronization mechanism and the like. The deployment driving and synchronous deployment of the scissor rod are achieved through gear meshing. The scissor rod deployment mechanism includes two scissor rods on both sides, each of which is composed of a rod member with a head and tail hinge. A plurality of hinge rods are arranged in the middle of the rod member to hinge the two scissor rods to each other. When the mechanism operates, the driving assembly drives the transmission mechanism to rotate, and then drives the scissor rod assembly to rotate, thereby converting the rotary motion of the rod member into the linear motion of the end of the scissor rod, and finally driving the deployment of the flexible solar blanket. This scissor rod deployment mechanism has the advantages of small folding size and simple structure. However, this scissor rod deployment mechanism has high requirements for the driving capacity of the driving mechanism, low transmission efficiency, and is difficult to provide a large deployment driving force. In addition, it also has the disadvantages of low configuration stiffness. SUMMARY

[0004] The present application aims to overcome the above-mentioned defects of the prior art, and to provide a scissor type deployment mechanism which can achieve a small folding size in the folded state, reliable deployment, and a stable structure after deployment.

[0005] The above-mentioned object of the present application is mainly achieved by the following technical scheme:

[0006] A scissor type deployment mechanism, comprising a top short rod assembly, a scissor type stage group rod member unit, a bottom support rod assembly and a driving unit assembly, wherein the top short rod assembly comprises an upper support, an upper shaft support, a small shaft sleeve, a top short rod, a short shaft and a limiting screw, the scissor type stage group rod member unit comprises a first hinge shaft, a rotating upper joint, a rotating lower joint and a long rod, and the bottom support rod assembly comprises a root joint, a support rod, a baffle limiting joint and a screw limiting joint.

[0007] The unfolding mechanism is connected with the unfolded object through the upper support, the small shaft sleeve and the upper shaft support are connected through the short shaft, the two sides are fixed by using the limiting screw, one end of the top short rod is connected with the upper shaft support, and the other end is connected with the first hinge shaft; the multi-stage scissor type stage group rod unit is connected through the first hinge shaft to form a multi-stage unfolding mechanism, the rotating upper joint and the rotating lower joint are connected with two ends of the long rod respectively; the long rods of the multi-stage unfolding mechanism are connected in sequence; the root joint is connected with the driving unit assembly, the driving unit assembly drives the root joint to realize unfolding and folding of the unfolding mechanism, and the root joint and the baffle limiting joint are connected with the supporting rod; when the unfolding mechanism is completely unfolded, the baffle limiting joint and the screw limiting joint are in contact, and locking is realized.

[0008] The top short rod assembly further comprises a rod top connecting head and a rod end connecting head, the top short rod is connected with the upper shaft support through the rod top connecting head and connected with the first hinge shaft through the rod end connecting head; the rod top connecting head and the rod end connecting head are provided with glue containing grooves and can be glued with the top short rod.

[0009] The scissor type stage group rod unit further comprises a long rod connecting piece, the long rod connecting piece is provided with a glue containing groove on the outer side and can be glued in the middle position of the long rod; a through hole is formed in the long rod connecting piece, and the long rod connecting piece is connected with the adjacent long rod through the through hole.

[0010] A first spring is arranged on the rotating lower joint to assist the mechanism to release when the unfolding mechanism is unfolded.

[0011] A spring pressing nut and a rod end limiting nail are arranged on the first spring, the rod end limiting nail is provided with a spherical convex platform at one end and a conical concave platform at the other end, in the folding state, the spherical convex platform and the conical concave platform of the rod end limiting nail of the adjacent first spring abut against each other, limit the transverse displacement of the long rod, and bear the launching load.

[0012] Further comprising a second hinge shaft, the screw limiting joint is connected with the lower end of the long rod in the first stage scissor type stage group rod unit, the baffle limiting joint is connected with the supporting rod, and the screw limiting joint and the baffle limiting joint are connected through the hinge shaft.

[0013] Further comprising a second spring, the second spring is arranged on the bottom supporting rod assembly and is used for increasing the driving force in the initial unfolding stage.

[0014] The driving unit assembly comprises a release spring, a support, a pawl, a ratchet wheel, a driving device and a root linkage device; the root joint is connected with the ratchet wheel, the ratchet wheel is engaged with the pawl installed on the support, the release spring is further installed on the support and is used for providing a certain acting force to the bottom supporting rod assembly in the folding state, assisting the unfolding of the bottom supporting rod assembly, the root linkage device connects the two side bottom supporting rod assemblies, and the driving device is further arranged on the bottom supporting rod assembly and is used for driving the bottom supporting rod assembly to rotate.

[0015] The unfolded-to-position indicating switch is arranged on the bottom support rod assembly and is used for monitoring the unfolding condition and generating an on-off signal to indicate whether the unfolding mechanism is completely unfolded.

[0016] The unfolded-to-position indicating switch comprises a switch triggering arm, a switch body and two spring sheets, the switch body is arranged on the bottom support rod assembly, the switch triggering arm is arranged on the scissor type stage group rod unit, and the two spring sheets are arranged on the switch body and do not contact each other in the folding state; when the unfolding mechanism is unfolded, the switch triggering arm abuts against one spring sheet, so that the two spring sheets contact each other, an on-off signal is generated, and whether the scissor rod unfolding mechanism is completely unfolded is indicated.

[0017] Compared with the prior art, the embodiment of the present application has at least the following beneficial effects:

[0018] (1) The present application realizes the limiting function when the folding and unfolding mechanism is completely unfolded through the limiting screw-baffle and the ratchet device, and realizes the limiting function when the folding and unfolding mechanism is folded through the taper hole and taper surface cooperation of the limiting metal joint, so that the working condition of the folding and unfolding mechanism is stable.

[0019] (2) The present application arranges the spring on the opposite side of the limiting metal joint of the scissor type stage group rod unit, so that the folding and unfolding mechanism has a certain initial angle when unfolded, and it is convenient to control the unfolding through the driving device.

[0020] (3) The present application forms a stable triangular structure through the bottom support rod assembly, the scissor type stage group rod unit and the limiting device after the scissor type unfolding mechanism is unfolded, so that the structural rigidity is improved.

[0021] (4) The present application preferably arranges the spring on the end joint of the bottom support rod assembly and the scissor type stage group rod unit, so as to increase the driving force in the initial unfolding stage, and at the same time, the limiting boss is arranged on the end joint of the bottom support rod assembly and the scissor type stage group rod unit, the upper and lower limiting bosses are embedded with each other in the folding state, and the mechanical load during the rocket launching can be borne.

[0022] (5) The present application preferably arranges the unfolded-to-position indicating switch, when the unfolding mechanism is unfolded, the switch triggering arm abuts against the upper spring sheet, so that the upper spring sheet contacts the lower spring sheet, thereby generating an on-off signal, and whether the scissor rod unfolding mechanism is completely unfolded can be indicated. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an unfolding schematic view of the high-reliability scissor type unfolding mechanism of the present application.

[0024] Figure 2 It is a folding schematic view of the high-reliability scissor type unfolding mechanism of the present application.

[0025] Figure 3Figure 1 is a schematic diagram of the top short rod assembly of the present application;

[0026] Figure 4 Figure 2 is a schematic diagram of the scissor-type stage group rod unit of the present application;

[0027] Figure 5 Figure 3 is a schematic diagram of the bottom support rod assembly of the present application;

[0028] Figure 6 Figure 4 is a schematic diagram of the driving unit assembly of the present application;

[0029] Figure 7 Figure 5 is a schematic diagram of the first spring installation position of the present application;

[0030] Figure 8 Figure 6 is a schematic diagram of the deployment-in-place indicating switch of the present application;

[0031] Figure 9 Figure 7 is a schematic diagram of the first spring of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0033] As shown in Figure 1 , Figure 2 , a scissor-type deployment mechanism includes a top short rod assembly 1, a scissor-type stage group rod unit 2, a bottom support rod assembly 3, and a driving unit assembly 4.

[0034] As shown in Figure 3 , the top short rod assembly 1 includes an upper support 101, an upper shaft support 102, a small shaft sleeve 103, a rod top connector 104, a top short rod 105, a rod end connector 106, a short shaft 107, and a limiting screw 108. The deployment mechanism is connected to a solar wing, an antenna, or other objects to be deployed through the upper support 101. The small shaft sleeve 103 and the upper shaft support 102 are connected through the short shaft 107, and the limiting screw 108 is used to fix both sides to achieve rotation of the top short rod assembly 1. One end of the top short rod 105 is connected to the upper shaft support 102, and the other end is connected to the first hinge shaft 201. The rod top connector 104 and the rod end connector 106 have a glue groove on the outside, which can be glued with the top short rod 105.

[0035] As shown in Figure 4As shown, the scissors type stage group rod unit 2 includes a first hinge shaft 201, a rotating upper joint 202, a rotating lower joint 203, a long rod 204, a long rod connecting piece 205 and a first spring 206. Each stage of the scissors type stage group rod unit 2 is connected by the hinge shaft 201 to form a multi-stage unfolding mechanism. The rotating upper joint 202 and the rotating lower joint 203 have glue grooves outside, which can be glued with the two rod ends of the long rod 204. The long rod connecting piece 205 has a glue groove outside, which can be glued in the middle position of the long rod 204. The long rod connecting piece 205 has a round hole, and another long rod 204 is connected through the shaft to form a scissors shape. The opposite side of the rotating lower joint 203 is provided with a spring 206, which provides an initial angle for the unfolding of the folding and unfolding mechanism to make the unfolding process easier and more stable.

[0036] As shown in the figure, Figure 5 The bottom support rod assembly 3 includes a root joint 301, a support rod 302, a baffle limiting joint 303, a second hinge shaft 304, a screw limiting joint 305, a support rod guide wheel 306 and a second spring 307. The root joint 301 is connected with the driving unit assembly 4 and has a glue groove outside, which can be glued with the support rod 302. The baffle limiting joint 303 has a glue groove outside, which can be glued with the support rod 302, and forms a limiting mechanism with the screw limiting joint 305 through the second hinge shaft 304. When the folding and unfolding mechanism is fully unfolded, the screw collides with the baffle to prevent the overall mechanism from continuing to unfold, i.e. to achieve the limiting locking function in the fully unfolded state. One end of the bottom support rod assembly 3 is connected with the first stage scissors rod, and the other end is connected with the support 402. The support rod guide wheel 306 is arranged on the second hinge shaft 304, and the second spring 307 is used to increase the driving force in the initial unfolding stage.

[0037] The screw limiting joint 305 is connected with the lower end of the long rod 204 in the first stage scissors type stage group rod unit 2, and the baffle limiting joint 303 is connected with the support rod 302. When the unfolding mechanism is fully unfolded, the screw limiting joint 305 and the baffle limiting joint 303 collide with each other to form a triangular stable structure, making the unfolded state more stable and reliable. The screw limiting joint 305 and the baffle limiting joint 303 are connected through the hinge shaft 304. The screw limiting joint 305 and the baffle limiting joint 303 are both provided with a hole for connection with the pressing device. The sunken round hole screw on the rib plate of the rotating lower joint 203 is installed with the first spring 206 to realize the preliminary mechanism release function.

[0038] As shown in the figure, Figure 6 The driving unit assembly 4 includes a release spring 401, a support 402, a pawl 403, a ratchet wheel 404, a driving device 405 and a root linkage device 406.

[0039] The hexagonal hole metal joint 301 at the end of the bottom support rod assembly 3 is connected with the ratchet wheel 404, the ratchet wheel 404 is engaged with the pawl 403 installed on the support 402, and the ratchet wheel 404 is used to prevent the shear rod from reversing during the unfolding process, thereby improving the reliability of the shear rod mechanism. In addition, the release spring 401 is also installed on the support 402 of the shear folding and unfolding mechanism, which is used to provide a certain force to the bottom support rod assembly 3 in the folded state, and assist the unfolding of the bottom support rod assembly 3.

[0040] The bottom support rod assembly 3 is also connected with the two side bottom support rod assemblies 3 through the root linkage device 406, so that the two side bottom support rod assemblies 3 move synchronously, and the root linkage device 406 includes but is not limited to a rope linkage mode. The driving device 405 is also arranged on the bottom support rod assembly 3, which is used to drive the rotation of the bottom support rod assembly 3.

[0041] As shown in Figure 7 , Figure 9 , the first spring 206 is provided with a spring pressing nut 2061 and a rod end limiting pin 2062, the rod end limiting pin 2062 is a spherical convex platform at one end and a conical concave platform at the other end, in the folded state, the spherical convex platform and the conical concave platform of the rod end limiting pin 2062 of the adjacent first spring 206 abut each other, limiting the transverse displacement of the long rod 204 and bearing the launching load.

[0042] As shown in Figure 8 , the unfolding indication switch 5 includes a switch triggering arm 501, a switch body 502 and a spring piece 503, the switch body 502 is installed on the bottom support rod assembly 3, the switch triggering arm 501 is installed on the shear type level group rod unit 2, and the two spring pieces 503 are installed on the switch body 502, in the folded state, the two spring pieces 503 do not contact each other, when the unfolding mechanism is unfolded, the switch triggering arm 501 abuts against one spring piece 503, so that the two spring pieces 503 contact each other, a on-off signal is generated, and whether the shear rod unfolding mechanism is completely unfolded is indicated.

[0043] The above is only the best specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0044] The contents not described in detail in the specification of the present application belong to the known technology of the person skilled in the art.

Claims

1. A scissors deployment mechanism characterized by: It includes top short rod assembly (1), scissor type stage group rod unit (2), bottom support rod assembly (3) and drive unit assembly (4), wherein the top short rod assembly (1) includes upper support (101), upper shaft support (102), small shaft sleeve (103), top short rod (105), short shaft (107) and limit screw (108), the scissor type stage group rod unit (2) includes first hinge shaft (201), rotating upper joint (202), rotating lower joint (203) and long rod (204), the bottom support rod assembly (3) includes root joint (301), support rod (302), baffle limit joint (303) and screw limit joint (305); The unfolding mechanism is connected with the unfolded object through the upper support (101), the small shaft sleeve (103) and the upper shaft support (102) are connected through the short shaft (107), the two sides are fixed by using the limit screw (108), one end of the top short rod (105) is connected with the upper shaft support (102), and the other end is connected with the first hinge shaft (201); the multistage scissor type stage group rod unit (2) is connected to form a multistage unfolding mechanism through the first hinge shaft (201), the rotating upper joint (202) and the rotating lower joint (203) are connected with the two ends of the long rod (204) respectively; the long rods (204) of the multistage unfolding mechanism are connected in sequence; the root joint (301) is connected with the drive unit assembly (4), the drive unit assembly (4) drives the root joint (301) to realize unfolding and folding of the unfolding mechanism, and the root joint (301) and the baffle limit joint (303) are connected with the support rod (302); when the unfolding mechanism is completely unfolded, the baffle limit joint (303) and the screw limit joint (305) are in contact, and the limiting locking is realized; The rotating lower joint (203) is provided with a first spring (206), which assists the mechanism to release when the unfolding mechanism is unfolded; The first spring (206) is provided with a spring pressing nut (2061) and a rod end limit nail (2062), the rod end limit nail (2062) is a spherical boss at one end and a conical recess at the other end, in the folding state, the spherical boss and the conical recess of the rod end limit nail (2062) of the adjacent first spring (206) abut each other, limit the transverse displacement of the long rod (204), and bear the launching load; It also includes an unfolding in place indicating switch (5), which is arranged on the bottom support rod assembly (3) and is used for monitoring the unfolding condition, generating an on-off signal and indicating whether the unfolding mechanism is completely unfolded; The deployment-to-position indicating switch (5) comprises a switch triggering arm (501), a switch body (502) and two spring leaves (503). The switch body (502) is installed on the bottom support rod assembly (3), the switch triggering arm (501) is installed on the scissor-type stage group rod unit (2), and the two spring leaves (503) are installed on the switch body (502). In the folded state, the two spring leaves (503) do not contact each other. When the deployment mechanism is deployed, the switch triggering arm (501) abuts against one spring leaf (503), so that the two spring leaves (503) contact each other, a on-off signal is generated, and it is indicated whether the scissor-type rod deployment mechanism is completely deployed.

2. A scissor deployment mechanism according to claim 1, characterized in that: The top short rod assembly (1) further comprises a rod top connector (104) and a rod end connector (106). The top short rod (105) is connected with the upper shaft support (102) through the rod top connector (104) and connected with the first hinge shaft (201) through the rod end connector (106). The rod top connector (104) and the rod end connector (106) are provided with glue containing grooves and can be glued with the top short rod (105).

3. A scissor deployment mechanism according to claim 1, wherein: The scissor-type stage group rod unit (2) further comprises a long rod connector (205). The long rod connector (205) is provided with a glue containing groove on the outer side and can be glued in the middle position of the long rod (204). A through hole is formed in the long rod connector (205) and the long rod (204) is connected through the through hole.

4. A scissor deployment mechanism according to claim 1, wherein: The second hinge shaft (304) is further provided. The screw limiting connector (305) is connected with the lower end of the long rod (204) in the first scissor-type stage group rod unit (2), the baffle limiting connector (303) is connected with the support rod (302), and the screw limiting connector (305) and the baffle limiting connector (303) are connected through the hinge shaft (304).

5. A scissor deployment mechanism according to claim 1, wherein: The second spring (306) is further provided on the bottom support rod assembly (3) to increase the driving force in the initial deployment stage.

6. A scissor deployment mechanism according to claim 1, wherein: The driving unit assembly (4) comprises a release spring (401), a support (402), a pawl (403), a ratchet wheel (404), a driving device (405) and a root linkage device (406). The root connector (301) is connected with the ratchet wheel (404), the ratchet wheel (404) is engaged with the pawl (403) installed on the support (402), the release spring (401) is further installed on the support (402) to provide a certain acting force on the bottom support rod assembly (3) in the folded state, assist the deployment of the bottom support rod assembly (3), the root linkage device (406) connects the two side bottom support rod assemblies (3), and the driving device (405) is further provided on the bottom support rod assembly (3) to drive the rotation of the bottom support rod assembly (3).

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