Scissor type unfolding mechanism

Abstract

The invention relates to a scissor type unfolding mechanism which comprises a top short rod assembly, scissor type stage group rod piece units, a bottom supporting rod assembly, a driving unit assembly and an unfolding in-place indicating switch, the unfolding mechanism is connected with an unfolded object through the top short rod assembly, and the multiple stages of scissor type stage group rod piece units are connected through hinge shafts to form a multi-stage unfolding mechanism. The long rods of the multiple stages of unfolding mechanisms are connected in sequence; the bottom supporting rod assembly is connected with the driving unit assembly, the driving unit assembly drives the bottom supporting rod assembly to achieve unfolding and folding of the unfolding mechanism, after the unfolding mechanism is unfolded, a stable triangular structure is formed through the bottom supporting rod assembly, the scissor type stage group rod piece units and the limiting devices, the structural rigidity is improved, and the unfolding mechanism is controlled to be unfolded.

Description

Technical Field

[0001] The invention belongs to the technical field of spacecraft deployment mechanisms, and in particular relates to a scissor-type deployment mechanism. Background Art

[0002] Deployable mechanisms are one of the important research topics in the field of space mechanisms. The scissor-type folding and unfolding mechanism is widely used in various spacecraft, such as solar wings, due to its compact structure and simple principle. The mechanism is usually unfolded by the relative rotation of the two rods of the scissor unit, and the required unfolding length is achieved by connecting multiple pairs of scissor units. In order to achieve reliable unfolding of the scissor rod unit, it is necessary to design the configuration scheme of the scissor rod mechanism. Different configuration schemes affect the performance indicators of the scissor rod mechanism, such as the unfolding driving force characteristics, reliability, and stiffness.

[0003] Patent CN 202210924857.7 discloses a scissor-type solar wing system, which uses a scissor-type unfolding mechanism as the unfolding mechanism of the flexible solar wing. The scissor-type unfolding mechanism includes a scissor-type rod assembly, a transmission mechanism, a synchronization mechanism, etc. The unfolding drive and synchronous unfolding of the scissor rod are realized by gear meshing. The scissor-type rod assembly of the scissor-type unfolding mechanism includes scissor-type rods on both sides, and the scissor rods on both sides are composed of rods hinged at the head and tail, and a number of hinged rods hinge the scissor rods on both sides to each other in the middle of the rod. When the mechanism is in motion, the drive assembly drives the transmission mechanism to rotate, and then drives the scissor-type rod assembly to rotate, thereby converting the rotational motion of the rod into the linear motion of the end of the scissor rod, and finally drives the unfolding of the flexible solar blanket. This scissor-type unfolding mechanism has the advantages of small folding size and simple structure, but this scissor-type unfolding mechanism has high requirements on the driving ability of the drive mechanism, low transmission efficiency, and it is difficult to provide a large unfolding driving force. In addition, there are also disadvantages such as low configuration stiffness. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a scissor-type unfolding mechanism, which can not only achieve a smaller folded size in the folded state, but also achieve highly reliable unfolding and has a more stable structural form after being unfolded into place.

[0005] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A scissor-type deployment mechanism, comprising a top short rod assembly, a scissor-type stage group rod unit, a bottom support rod assembly and a drive 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 limit screw, the scissor-type stage group rod 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 limit joint and a screw limit joint;

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

[0008] The top short rod assembly also includes a rod top connector and a rod end connector. The top short rod is connected to the upper shaft support via the rod top connector and is connected to the first hinge shaft via the rod end connector. The rod top connector and the rod end connector are provided with glue grooves that can be glued to the top short rod.

[0009] The scissor-type stage group rod unit also includes a long rod connecting piece, and a glue groove is reserved on the outer side of the long rod connecting piece, which can be glued at the middle position of the long rod; a through hole is opened on the long rod connecting piece, and is connected to the adjacent long rod through the through hole.

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

[0011] A spring clamping nut and a rod end limiting pin are provided on the first spring. The rod end limiting pin has a spherical boss at one end and a conical concave platform at the other end. When in the retracted state, the spherical boss and conical concave platform of the rod end limiting pin of the adjacent first springs abut against each other, limiting the lateral displacement of the long rod and bearing the launching load.

[0012] It also includes a second hinge shaft, the screw limit joint is connected to the lower end of the long rod in the first-stage scissor-type stage group rod unit, the baffle limit joint is connected to the support rod, and the screw limit joint is connected to the baffle limit joint through the hinge shaft.

[0013] The utility model also includes a second spring, which is arranged on the bottom support rod assembly and is used to increase the driving force in the initial deployment stage.

[0014] The driving unit assembly includes a release spring, a support, a pawl, a ratchet, a driving device and a root linkage device; the root joint is connected to the ratchet, the ratchet engages with the pawl installed on the support, and a release spring is also installed on the support to provide a certain force to the bottom support rod assembly in the retracted state to assist the deployment of the bottom support rod assembly. The root linkage device connects the bottom support rod assemblies on both sides, and a driving device is also provided on the bottom support rod assembly to drive the bottom support rod assembly to rotate.

[0015] It also includes a fully deployed indication switch, which is arranged on the bottom support rod assembly and is used to monitor the deployment status and generate an on-off signal to indicate whether the deployment mechanism is fully deployed.

[0016] The deployed position indication switch includes a switch trigger arm, a switch body and a reed. The switch body is installed on the bottom support rod assembly, the switch trigger arm is installed on the scissor-type stage group rod unit, and two reeds are installed on the switch body. In the folded state, the two reeds do not contact each other. When the deployment mechanism is deployed, the switch trigger arm abuts against a reed, causing the two reeds to contact each other, generating an on-off signal, indicating whether the scissor rod deployment mechanism is fully deployed.

[0017] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0018] (1) The present invention realizes the limiting function when the folding and unfolding mechanism is fully unfolded by means of a limiting screw-baffle and a ratchet device, and realizes the limiting function when the folding and unfolding mechanism is folded by means of the cooperation between the tapered hole and the tapered surface of the limiting metal joint, so that the working condition of the folding and unfolding mechanism is stable.

[0019] (2) The present invention arranges springs on opposite sides of the limiting metal joints of the scissor-type stage group rod unit, so that the folding and unfolding mechanism has a certain initial angle when unfolding, which is convenient for controlling its unfolding through the driving device.

[0020] (3) After the scissor-type unfolding mechanism of the present invention is unfolded, a stable triangular structure is formed through the bottom support rod assembly, the scissor-type stage rod unit, and the limit device, thereby improving the structural rigidity.

[0021] (4) In the present invention, springs are preferably provided on the end joints of the bottom support rod assembly and the scissor-type stage rod unit to increase the driving force in the initial deployment stage. At the same time, corresponding limit bosses are provided on the end joints of the bottom support rod assembly and the scissor-type stage rod unit. When in the folded state, the upper and lower limit bosses are engaged with each other to withstand the mechanical load during rocket launch.

[0022] (5) The present invention is preferably provided with a fully deployed indication switch. When the deployment mechanism is deployed, the switch trigger arm abuts against the upper spring leaf, so that the upper spring leaf contacts the lower spring leaf, thereby generating an on-off signal, which can indicate whether the scissor lever deployment mechanism is fully deployed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the deployment of the high-reliability scissor-type deployment mechanism of the present invention;

[0024] Figure 2 It is a schematic diagram of the folding of the high-reliability scissor-type deployment mechanism of the present invention;

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

[0026] Figure 4 It is a schematic diagram of a scissor-type stage assembly rod unit of the present invention;

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

[0028] Figure 6 It is a schematic diagram of the drive unit assembly of the present invention;

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

[0030] Figure 8 This is a schematic diagram of the unfolded position indicating switch of the present invention;

[0031] Fig. 9 It is a schematic diagram of the first spring of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1 , Figure 2 As shown, a scissor-type unfolding 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] like Figure 3 As shown, 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 limit screw 108. The unfolding mechanism is connected to the unfolded objects such as the solar wing and the antenna through the upper support 101, and the small shaft sleeve 103 and the upper shaft support 102 are connected through the short shaft 107, and the two sides are fixed with limit screws 108 to realize the 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 outside of the rod top connector 104 and the rod end connector 106 has a glue groove, which can be glued with the top short rod 105.

[0035] like Figure 4As shown, the scissor-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 level of the scissor-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-receiving grooves on the outside, which can be glued with the two rod ends of the long rod 204; the long rod connecting piece 205 has a glue-receiving groove on the outside, which can be glued at the middle position of the long rod 204; the long rod connecting piece 205 has a round hole, which is connected to another long rod 204 through an axis to form a scissor-like shape. The spring 206 is installed on the opposite side of the rotating lower joint 203 to provide an initial angle for the unfolding of the folding and unfolding mechanism so that the unfolding process is easier and more stable.

[0036] like Figure 5 As shown, the bottom support rod assembly 3 includes a root joint 301, a support rod 302, a baffle limit joint 303, a second hinge shaft 304, a screw limit joint 305, a support rod guide wheel 306 and a second spring 307. The root joint 301 is connected to the drive unit assembly 4, and a glue groove is left on the outside, which can be glued with the support rod 302; the baffle limit joint 303 has a glue groove on the outside, which can be glued with the support rod 302, and forms a limit mechanism through the second hinge shaft 304 and the screw limit joint 305. When the folding and unfolding mechanism is fully unfolded, the screw collides with the baffle so that the entire mechanism cannot continue to unfold, that is, it reaches the fully unfolded state to realize the limit locking function. One end of the bottom support rod assembly 3 is connected to the first-stage scissor rod, and the other end is connected to the support 402. The support rod guide wheel 306 is set 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 limit joint 305 is connected to the lower end of the long rod 204 in the first-stage scissor-type stage group rod unit 2, and the baffle limit joint 303 is connected to the support rod 302. When the unfolding mechanism is fully unfolded, the screw limit joint 305 and the baffle limit joint 303 collide to form a triangular stable structure, making the unfolding state more stable and reliable; the screw limit joint 305 and the baffle limit joint 303 are connected through the hinge shaft 304; the screw limit joint 305 and the baffle limit joint 303 are both provided with holes for easy connection with the clamping device, and the countersunk round hole screws and the first spring 206 are installed on the rib plate of the rotating lower joint 203 to realize the preliminary mechanism release function.

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

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

[0040] The bottom support rod assembly 3 also has a root linkage device 406 to connect the bottom support rod assemblies 3 on both sides to achieve synchronous movement of the bottom support rod assemblies 3 on both sides. The root linkage device 406 includes but is not limited to a rope linkage method. The bottom support rod assembly 3 is also provided with a driving device 405 for driving the bottom support rod assembly 3 to rotate.

[0041] like Figure 7 , Fig. 9 As shown, a spring clamping nut 2061 and a rod end limiting pin 2062 are provided on the first spring 206. The rod end limiting pin 2062 has a spherical boss at one end and a conical concave boss at the other end. When in the retracted state, the spherical bosses and conical concave bosses of the rod end limiting pins 2062 of adjacent first springs 206 abut against each other, limiting the lateral displacement of the long rod 204 and bearing the launching load.

[0042] like Figure 8 As shown, the deployed position indication switch 5 includes a switch trigger arm 501, a switch body 502 and a reed 503. The switch body 502 is installed on the bottom support rod assembly 3, the switch trigger arm 501 is installed on the scissor-type stage group rod unit 2, and two reeds 503 are installed on the switch body 502. In the folded state, the two reeds 503 do not contact each other. When the deployment mechanism is deployed, the switch trigger arm 501 abuts against a reed 503, so that the two reeds 503 contact each other, generating an on-off signal, indicating whether the scissor rod deployment mechanism is fully deployed.

[0043] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0044] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A scissor-type unfolding mechanism, characterized in that: The invention comprises a top short rod assembly (1), a scissor-type stage assembly rod unit (2), a bottom support rod assembly (3) and a drive unit assembly (4), wherein the top short rod assembly (1) comprises an upper support (101), an upper shaft support (102), a small shaft sleeve (103), a top short rod (105), a short shaft (107) and a limit screw (108); the scissor-type stage assembly rod unit (2) comprises a first hinge shaft (201), a rotating upper joint (202), a rotating lower joint (203) and a long rod (204); and the bottom support rod assembly (3) comprises a root joint (301), a support rod (302), a baffle limit joint (303) and a screw limit joint (305); The unfolding mechanism is connected to the unfolded object through an upper support (101); a small shaft sleeve (103) and an upper shaft support (102) are connected through a short shaft (107), and both sides are fixed with limit screws (108); one end of a top short rod (105) is connected to the upper shaft support (102), and the other end is connected to a first hinge shaft (201); a multi-stage scissor-type stage group rod element unit (2) is connected through the first hinge shaft (201) to form a multi-stage unfolding mechanism; a rotating upper joint (202) and a rotating lower joint (203) are respectively The root joint (301) is connected to the driving unit assembly (4), and the driving unit assembly (4) drives the root joint (301) to realize the expansion and folding of the expansion mechanism, and the root joint (301) and the baffle limit joint (303) are connected to the support rod (302); when the expansion mechanism is fully expanded, the baffle limit joint (303) and the screw limit joint (305) are in contact to realize limit locking.

2. A scissor-type unfolding 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 to the upper shaft support (102) via the rod top connector (104), and is connected to the first hinge shaft (201) via the rod end connector (106); the rod top connector (104) and the rod end connector (106) are provided with glue grooves which can be glued to the top short rod (105).

3. A scissor-type unfolding mechanism according to claim 1, characterized in that: The scissor-type stage assembly rod element unit (2) also includes a long rod connecting member (205), and a glue-containing groove is left on the outside of the long rod connecting member (205), which can be glued at the middle position of the long rod (204); a through hole is opened on the long rod connecting member (205), and is connected to the adjacent long rod (204) through the through hole.

4. The scissor-type unfolding mechanism according to claim 1, characterized in that: A first spring (206) is arranged on the rotating lower joint (203) to release the auxiliary mechanism when the unfolding mechanism unfolds.

5. A scissor-type unfolding mechanism according to claim 4, characterized in that: The first spring (206) is provided with a spring clamping nut (2061) and a rod end limiting pin (2062), wherein the rod end limiting pin (2062) has a spherical boss at one end and a conical concave boss at the other end. When in the retracted state, the spherical boss and the conical concave boss of the rod end limiting pin (2062) of the adjacent first springs (206) abut against each other, thereby limiting the lateral displacement of the long rod (204) and bearing the launching load.

6. The scissor-type unfolding mechanism according to claim 1, characterized in that: It also includes a second hinge shaft (304), the screw limit joint (305) is connected to the lower end of the long rod (204) in the first-stage scissor-type stage group rod unit (2), the baffle limit joint (303) is connected to the support rod (302), and the screw limit joint (305) is connected to the baffle limit joint (303) via the hinge shaft (304).

7. The scissor-type unfolding mechanism according to claim 1, characterized in that: It also includes a second spring (306), which is arranged on the bottom support rod assembly (3) and is used to increase the driving force in the initial unfolding stage.

8. The scissor-type unfolding mechanism according to claim 1, characterized in that: The drive unit assembly (4) includes a release spring (401), a support (402), a pawl (403), a ratchet (404), a drive device (405) and a root linkage device (406); The root joint (301) is connected to a ratchet (404), and the ratchet (404) is meshed with a pawl (403) installed on a support (402). A release spring (401) is also installed on the support (402) for providing a certain force to the bottom support rod assembly (3) in a retracted state to assist the bottom support rod assembly (3) in unfolding. The root linkage device (406) connects the bottom support rod assemblies (3) on both sides. A driving device (405) is also provided on the bottom support rod assembly (3) for driving the bottom support rod assembly (3) to rotate.

9. The scissor-type unfolding mechanism according to claim 1, characterized in that: It also includes a fully deployed indication switch (5), which is arranged on the bottom support rod assembly (3) and is used to monitor the deployment status and generate an on-off signal to indicate whether the deployment mechanism is fully deployed.

10. The scissor-type unfolding mechanism according to claim 9, characterized in that: The fully deployed indicating switch (5) comprises a switch trigger arm (501), a switch body (502) and a reed (503); the switch body (502) is mounted on the bottom support rod assembly (3); the switch trigger arm (501) is mounted on the scissor-type stage assembly rod unit (2); two reeds (503) are mounted on the switch body (502); in a retracted state, the two reeds (503) do not contact each other; when the deployment mechanism is deployed, the switch trigger arm (501) abuts against one reed (503), so that the two reeds (503) contact each other, thereby generating an on-off signal to indicate whether the scissor rod deployment mechanism is fully deployed.

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