Centrifugal on-orbit culture test device

Abstract

The present invention discloses a centrifugal on-orbit culture test device, comprising a basic unit and a driving unit, wherein the basic unit comprises a frame, a transmission rod assembly and a culture chamber, the transmission rod assembly comprises a driving rod and a driven rod hinged to each other, the culture chamber is arranged at the end of the driven rod, the driving rod can be driven away from the frame and can be driven to rotate around a fixed axis; a plurality of transmission rod assemblies are provided, and the lengths of the driving rods corresponding to the plurality of transmission rod assemblies are different; the driving unit comprises a translational driving mechanism and a rotational driving mechanism, the translational driving mechanism is used to drive the driving rod away from the frame; the rotational driving mechanism is used to drive the driving rod to rotate around a fixed axis; the centrifugal on-orbit culture test device provided by the present invention provides centrifugal forces of different sizes at the same time by arranging driving arms of different lengths to rotate, so as to simulate different gravity; the driving arm can be driven away, ensuring that the structure of the entire device is more compact before the test begins.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifuges and relates to a centrifugal on-orbit culture test device. Background Art

[0002] With the advancement of science and technology, human exploration of space is constantly ongoing. Research on plant growth in low-gravity environments is an important part of my country's aerospace research. A low-speed centrifuge is a test machine that generates centrifugal force through rotation. In the low-gravity (zero-gravity) environment of space, the centrifugal force generated by the centrifuge's rotation can simulate a microgravity test environment, meeting the experimental environment requirements for studying plant growth in low-gravity environments.

[0003] Conventional centrifugal equipment cannot generate multiple different centrifugal forces at the same time when working. This means that if you want to study the growth of the same batch of plants under different gravity conditions, you need to arrange multiple centrifugal equipment at the same time. Due to the compact structure of the spacecraft and the relatively harsh working environment during launch and in-orbit operation, conventional centrifugal equipment cannot meet the experimental requirements of in-orbit tests in terms of structure and function.

[0004] In order to solve the above problems, an on-orbit test device is needed that has a compact structure, reliable operation, can enter outer space and can provide different centrifugal forces at the same time. Summary of the Invention

[0005] In view of this, the present invention provides a centrifugal on-orbit culture test device, which provides centrifugal forces of different sizes at the same time by setting driving arms of different lengths to rotate, so as to simulate different gravity; the driving arms can be driven away, ensuring that the structure of the entire device is more compact before the experiment begins.

[0006] The present invention discloses a centrifugal on-orbit culture test device, comprising:

[0007] A base unit comprising a frame, a transmission rod assembly, and a culture chamber, wherein the transmission rod assembly comprises a driving rod and a driven rod hinged to each other, the culture chamber being disposed at the end of the driven rod, the driving rod being drivable away from the frame and being rotatable about a fixed axis to cause the culture chamber to move centrifugally therewith; a plurality of transmission rod assemblies are provided, and the lengths of the driving rods corresponding to the plurality of transmission rod assemblies are different;

[0008] The driving unit includes a translation driving mechanism and a rotation driving mechanism; the translation driving mechanism is installed on the frame to drive the driving rod away from the frame; the rotation driving mechanism is installed on the frame to drive the driving rod to rotate around a fixed axis.

[0009] Furthermore, the translation drive mechanism includes an outer sleeve, an inner sleeve and a sliding sleeve, the frame includes a fixed plate, the sliding sleeve is passed through the inner sleeve and is fixedly connected to the inner sleeve in the axial direction, the drive rod is fixedly installed at the end of the sliding sleeve, the inner sleeve is passed through the outer sleeve, and the inner sleeve is transmission-connected to the outer sleeve, the outer sleeve is arranged on the fixed plate in a manner that can be driven to rotate around its own axis, and the inner sleeve can translate axially with the rotation of the outer sleeve to drive the drive rod away from the frame.

[0010] Furthermore, the rotation drive mechanism includes a rotation shaft, which is coaxially arranged in the sliding sleeve and fixedly connected to the sliding sleeve in the circumferential direction; the rotation shaft can be driven to rotate, and the sliding sleeve follows to drive the drive rod to rotate.

[0011] Furthermore, the translational drive mechanism also includes a translational drive source and a translational transmission pair, and the translational drive source drives the outer sleeve to rotate through the translational transmission pair; the rotational drive mechanism also includes a rotational drive source and a rotational transmission pair, and the rotational drive source drives the rotation shaft to rotate through the rotational transmission pair; the translational drive source and the rotational drive source are symmetrically installed on the fixed disk along the radial direction of the fixed disk.

[0012] Furthermore, the translation drive mechanism also includes a support frame, the inner wall surface of the outer sleeve is provided with an internal thread, the outer wall surface of the inner sleeve is provided with an external thread, the inner sleeve and the outer sleeve form a transmission connection through threaded matching, the support frame is installed at the end of the inner sleeve, and the end of the sliding sleeve is axially inserted into the support frame.

[0013] Furthermore, a connecting key is installed at the end of the rotating shaft, and the inner surface of the sliding sleeve is provided with a keyway extending in the axial direction. The connecting key is inserted into the keyway so that the rotating shaft and the sliding sleeve are fixedly connected in the circumferential direction.

[0014] Furthermore, the middle part of the driving rod in the longitudinal direction is installed on the end of the sliding sleeve, and the two ends of the driving rod in the longitudinal direction are respectively hinged with driven rods, and a culture chamber is installed at the end of any driven rod; the end of the driving rod in the longitudinal direction is provided with a first limiting part, and the position of the driven rod corresponding to the first limiting part is provided with a second limiting part, the first limiting part is a semi-circular arc structure, and the second limiting part is a quarter-circular arc structure, and the first limiting part and the second limiting part abut against each other to limit the swing of the driven rod.

[0015] Furthermore, it also includes a connecting plate, the head end of the inner sleeve is provided with a first limiting hole, the head end of the sliding sleeve is provided with a second limiting hole, the connecting plate is provided with a first limiting column and a second limiting column, the first limiting column is provided corresponding to the position of the first limiting hole, the second limiting column is provided corresponding to the position of the second limiting hole, the first limiting column and the second limiting column are respectively and detachably plugged into the first limiting hole and the second limiting hole.

[0016] Furthermore, the translation transmission pair includes a translation main gear and a translation sub gear that mesh with each other, the translation main gear is installed at the power output end of the translation drive source for outputting power, and the translation sub gear is installed at the head end of the outer sleeve for receiving the power output of the translation drive source to drive the outer sleeve to rotate;

[0017] The rotating transmission pair includes a rotating main gear and a rotating sub-gear that mesh with each other. The rotating main gear is installed at the power output end of the rotating drive source for outputting power. The rotating sub-gear is installed at the head end of the rotating shaft for receiving the power output by the rotating drive source to drive the rotating shaft to rotate; the rotating sub-gear avoids the rotating main gear.

[0018] Furthermore, the two fixing plates are coaxially arranged, and the two transmission rod assemblies are correspondingly provided with two driving rods, and the lengths of the driving rods corresponding to the two transmission rod assemblies are different.

[0019] Beneficial effects of the present invention:

[0020] The present invention discloses a centrifugal on-orbit cultivation test device, which provides centrifugal forces of different sizes at the same time by arranging driving arms of different lengths to rotate, simulates different gravity, and ensures that the same batch of plants can grow simultaneously under different gravity conditions to meet the test requirements; the driving arm can be driven away, and the transmission rod assembly and the culture chamber are arranged close to the frame before the test starts. When the test is carried out, the driving rod is operated to move away to expand the culture chamber. This arrangement ensures that the structure of the entire device is more compact before the test starts; the translation drive mechanism and the rotation drive mechanism of the present invention use a multi-level nested structure, so that the translation motion and the rotation motion are highly integrated, and the same part can complete translation and rotation in a limited space. The structure is compact and provides a guarantee for the realization of different gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention before work begins;

[0022] Figure 2 A schematic diagram of the structure of an embodiment of the present invention when in operation;

[0023] Figure 3Schematic diagram of the assembly structure of the fixed plate and the drive unit (excluding the translation drive source and the rotation drive source) according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0025] Figure 5 A schematic structural diagram of a driving rod according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic structural diagram of a driven rod according to an embodiment of the present invention:

[0027] Figure 7 Schematic diagram of the installation structure of the translational drive source and the rotational drive source on the fixed disk of the present invention;

[0028] Figure 8 Schematic diagram of the exploded assembly structure of the inner sleeve, the sliding sleeve and the connecting plate according to an embodiment of the present invention;

[0029] Figure 9 Schematic diagram of the structure of the connecting plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] It should be noted that, in the description of this specification, the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise specified, the head end and the end end in this embodiment are based on the order of power transmission, the end where power is input is the head end, and the end where power is output is the end end, and fixed-axis rotation is rotation around a fixed axis. In this embodiment, unless otherwise specified, fixed-axis rotation is rotation around its own axis. At the same time, the culture bin in this embodiment is used for on-orbit cultivation of plants, and the internal structure of the culture bin is prior art, which can be understood by those skilled in the art and will not be elaborated here.

[0031] As shown in the figure, an embodiment of the present invention discloses a centrifugal on-orbit culture test device, comprising:

[0032] A base unit includes a frame, a transmission rod assembly, and a culture chamber 1. The transmission rod assembly includes a mutually hinged drive rod 3 and a driven rod 4. The culture chamber 1 is disposed at the end of the driven rod 4. The drive rod 3 can be driven away from the frame and can be driven to rotate about a fixed axis so that the culture chamber 1 moves centrifugally with the movement. The transmission rod assemblies are provided in plurality, and the lengths of the drive rods 3 corresponding to the plurality of transmission rod assemblies are different. A drive unit includes a translational drive mechanism and a rotational drive mechanism. The translational drive mechanism is mounted on the frame for driving the drive rod 3 away from the frame; the rotational drive mechanism is mounted on the frame for driving the drive rod 3 to rotate about a fixed axis. In this embodiment, as shown in the figure, the frame includes two coaxial fixed disks 2. The transmission rod assemblies are provided in pairs, and the lengths of the drive rods 3 corresponding to the two transmission rod assemblies are different. Correspondingly, two drive units (excluding the translational drive source 5 and the rotational drive source 6) are also provided in pairs. The two drive rods 3 in this embodiment differ only in their setting positions and their own lengths, and all other aspects are the same. The two groups of drive units differ only in their setting positions, so this embodiment will be explained using one group as an example. This is understandable to those skilled in the art and will not be elaborated on here. By setting drive arms of different lengths to rotate, different centrifugal forces are provided simultaneously to simulate different gravity, ensuring that the same batch of plants can grow under different gravity conditions at the same time to meet the test requirements; the drive arm can be driven away, and before the test begins, the transmission rod assembly and the culture chamber 1 are set close to the frame. When the test is carried out, the drive rod 3 is operated to move away to expand the culture chamber 1. This setting ensures that the structure of the entire device is more compact before the test begins.

[0033] In this embodiment, the translation drive mechanism includes an outer sleeve 7, an inner sleeve 8 and a sliding sleeve 9. The sliding sleeve 9 is inserted into the inner sleeve 8 and is fixedly connected to the inner sleeve 8 in the axial direction. The sliding sleeve 9 and the inner sleeve 8 are connected by a bearing. In this way, the sliding sleeve 9 and the inner sleeve 8 are fixed in the axial direction and will not move relative to each other, but they can rotate relative to each other in the circumferential direction. The drive rod 3 is fixedly mounted on the end of the sliding sleeve 9. The inner sleeve 8 is inserted into the outer sleeve 7 and is transmission-connected to the outer sleeve 7. The outer sleeve 7 is coaxially mounted on the fixed plate 2 through a bearing 16 in a manner that can be driven to rotate around its own axis. At the same time, in this embodiment, a thrust bearing 10 is also provided on the fixed plate. The thrust bearing 10 cooperates with the fixed plate and the bearing 16 to limit the outer sleeve in the axial direction so that it can only rotate in a fixed axis. The inner sleeve 8 can translate axially with the rotation of the outer sleeve 7 to drive the drive rod 3 away from the frame. The rotation drive mechanism in this embodiment includes a rotating shaft 13, which is coaxially arranged in the sliding sleeve 9 and fixedly connected to the sliding sleeve 9 in the circumferential direction, that is, the rotating shaft 13 and the sliding sleeve 9 can rotate synchronously in the circumferential direction, but can slide relative to each other in the axial direction. This connection method in this embodiment is realized by a key connection. The end of the rotating shaft 13 in this embodiment is detachably installed with a connecting key 14 by a screw, and the inner surface of the sliding sleeve 9 is provided with a keyway extending in the axial direction. The connecting key 14 is inserted into the keyway so that the rotating shaft 13 and the sliding sleeve 9 are fixedly connected in the circumferential direction. Under the action of the connecting key, the rotating shaft 13 can drive the sliding sleeve 9 to rotate, but will not affect the axial sliding of the sliding sleeve 9 on the rotating shaft 13; the rotating shaft 13 can be driven to rotate, and the sliding sleeve 9 follows to drive the driving rod 3 to rotate.

[0034] In this embodiment, the translation drive mechanism also includes a support frame 23. The inner wall surface of the outer sleeve 7 is provided with an internal thread, and the outer wall surface of the inner sleeve 8 is provided with an external thread. The inner sleeve 8 and the outer sleeve 7 form a transmission connection through threaded matching. The support frame 23 is installed on the end of the inner sleeve 8 through a threaded connection. The end of the sliding sleeve 9 is axially penetrated through the support frame 23. A bearing as shown in the figure is also provided between the sliding sleeve 9 and the support frame 23, so that the support frame 23 supports and limits the sliding sleeve 9 in the radial direction of the sliding sleeve 9, ensuring that the rotation of the sliding sleeve 9 is smoother and smoother.

[0035] The translation drive mechanism in this embodiment also includes a translation drive source 5 and a translation transmission pair, and the translation drive source 5 drives the outer sleeve 7 to rotate through the translation transmission pair; the translation transmission pair includes a translation main gear 18 and a translation sub gear 11 that are meshed with each other, and the translation main gear 18 is installed at the power output end of the translation drive source 5 for outputting power, and the translation sub gear 11 is installed at the head end of the outer sleeve 7 for receiving the power output of the translation drive source 5 to drive the outer sleeve 7 to rotate; as shown in the figure, the translation transmission pair in this embodiment is a pair of meshing bevel gears, the translation drive source 5 is a motor, and the frame in this embodiment also includes a motor fixing seat arranged on the fixed disk 2, and the translation drive source 5 is installed on the fixed disk 2 through the motor fixing seat.

[0036] The rotation drive mechanism in this embodiment also includes a rotation drive source 6 and a rotation transmission pair. The rotation drive source 6 drives the rotation shaft 13 to rotate through the rotation transmission pair. The rotation transmission pair includes a mutually meshing rotation main gear 17 and a rotation sub-gear 12. The rotation main gear 17 is mounted on the power output end of the rotation drive source 6 for outputting power. The rotation sub-gear 12 is mounted on the head end of the rotation shaft 13 for receiving the power output from the rotation drive source 6 to drive the rotation of the rotation shaft 13. As shown in the figure, the rotation transmission pair in this embodiment is also a pair of mutually meshing bevel gears. The rotation drive source 6 is a motor, which is also mounted on the fixed plate 2 via a motor mounting seat. The rotation drive source 6 drives the rotation shaft 13 through the rotation transmission pair. The rotation shaft 13 drives the sliding sleeve 9 through a key connection. The sliding sleeve 9 further drives the drive rod 3 to rotate. The drive rod 3 drives the driven rod 4 to rotate, thereby driving the culture chamber 1 to rotate and generate centrifugal force, thereby establishing a microgravity environment.

[0037] The translational drive source 5 and the rotational drive source 6 in this embodiment are symmetrically mounted on the fixed disk 2 along the radial direction of the fixed disk 2. The rotating sub-gear 12 is arranged to avoid the rotating main gear 17. As shown in the figure, the translational sub-gear 11 is larger than the rotating sub-gear 12 in size. At the same time, the translational sub-gear 11 is also offset from the rotating sub-gear 12 in the axial direction, which makes the entire rotating transmission pair and the translational transmission pair offset and avoid each other, and at the same time, they are structurally nested with each other, ensuring the transmission effect while making the structure more compact.

[0038] In this embodiment, the middle portion of the driving rod 3 in the longitudinal direction is fixedly mounted on the end of the sliding sleeve 9, and the two ends of the driving rod 3 in the longitudinal direction are respectively hingedly provided with follower rods 4, and the end of any follower rod 4 is installed with a culture chamber 1; the end of the driving rod 3 in the longitudinal direction is provided with a first limiting portion 19, and the follower rod 4 is provided with a second limiting portion 20 at the position corresponding to the first limiting portion 19. The first limiting portion 19 is a semicircular arc structure, and the second limiting portion 20 is a quarter-circular arc structure. The first limiting portion 19 and the second limiting portion 20 abut against each other to limit the swing of the follower rod 4. As shown in the figure, the first limiting portion 19 is a semicircular structure with two sides, and the second limiting portion 20 is a quarter-circular arc ring structure, and also has two sides. The two sides of the first limiting portion 19 and the two sides of the second limiting portion 20 are one-to-one corresponding and will not be released at the same time. When in a non-working state, such as Figure 1 As shown, one side of the first limiting portion 19 and one side of the second limiting portion 20 abut against each other so that the driving rod 3 and the driven rod 4 are at 90 degrees. When working, under the action of centrifugal force, the other side of the first limiting portion 19 and the other side of the second limiting portion 20 abut against each other, thereby forming the following Figure 2 The straight structure shown effectively limits the rotation angle of the driven rod 4.

[0039] In this embodiment, a connecting plate 15 is further included. The head end of the inner sleeve 8 is provided with a first limiting hole 24, the head end of the sliding sleeve 9 is provided with a second limiting hole 25, and the connecting plate 15 is provided with a first limiting post 21 and a second limiting post 22. The first limiting post 21 is provided at a position corresponding to the first limiting hole 24, and the second limiting post 22 is provided at a position corresponding to the second limiting hole 25. The first limiting post 21 and the second limiting post 22 are respectively and detachably plugged into the first limiting hole 24 and the second limiting hole 25. As shown in the figure, the connecting plate 15 in this embodiment has an approximately triangular structure. The connecting plate 15 is slidably sleeved on the rotating shaft. Three groups of first limiting posts 21 and second limiting posts 22 are arranged in a circular array on the connecting plate 15, and three groups of first limiting holes 24 and second limiting holes 25 are provided correspondingly. The connection plate 15 is provided to ensure that the inner sleeve 8 and the sliding sleeve 9 are synchronously translated during the unfolding process of the drive rod 3. Before and during the unfolding process, the first limiting post 21 and the second limiting post 22 of the connection plate 15 are respectively inserted into the first limiting hole 24 and the second limiting hole 25, so that the inner sleeve 8 and the sliding sleeve 9 are fixed in the circumferential direction to avoid the inner sleeve 8 from idling. When unfolding, since the rotating shaft 13 does not rotate at this time, the connection plate 15, the inner sleeve 8 and the sliding sleeve 9 will not rotate. Therefore, the outer sleeve 7 rotates and drives the connection plate 15, the inner sleeve 8 and the sliding sleeve 9 to move synchronously. The rotating shaft 13 of this embodiment is a stepped shaft. After the inner sleeve 8 and the sliding sleeve 9 have translated a certain distance, the connecting plate 15 is limited by the limiting action of the shaft shoulder of the rotating shaft 13 and cannot translate. However, the inner sleeve 8 and the sliding sleeve 9 will still translate and deploy outward under the drive of the outer sleeve 7 until the first limiting post 21 and the second limiting post 22 are completely disengaged from the first limiting hole 24 and the second limiting hole 25. The inner sleeve 8 and the sliding sleeve 9 are then released from circumferential fixation. No matter how the outer sleeve 7 rotates, the inner sleeve 8 will only idle. At this time, the deployment is completed, the translation drive source 5 is synchronously shut down, and the outer sleeve 7 stops rotating. Since this embodiment is mainly for on-orbit testing, there is no need to consider the issue of device recovery, so there is no need to consider how to retract it. This is understandable to those skilled in the art and will not be elaborated here.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A centrifugal on-orbit culture test device, characterized in that: include: A base unit comprising a frame, a transmission rod assembly, and a culture chamber, wherein the transmission rod assembly comprises a driving rod and a driven rod hinged to each other, the culture chamber being disposed at the end of the driven rod, the driving rod being drivable away from the frame and being rotatable about a fixed axis to cause the culture chamber to move centrifugally therewith; a plurality of transmission rod assemblies are provided, and the lengths of the driving rods corresponding to the plurality of transmission rod assemblies are different; A driving unit, comprising a translational driving mechanism and a rotational driving mechanism; The translation drive mechanism is mounted on the frame to drive the drive rod away from the frame; the rotation drive mechanism is mounted on the frame to drive the drive rod to rotate around a fixed axis; The cam is fixedly mounted on the drive shaft of the driving mechanism, and the cam is connected to the drive shaft by the support leg of the driving mechanism. The cam is fixedly mounted on the drive shaft of the driving mechanism, and the support leg is connected to the support leg of the driving mechanism by the support leg. The rotation drive mechanism includes a rotation shaft, which is coaxially arranged in the sliding sleeve and fixedly connected to the sliding sleeve in the circumferential direction; the rotation shaft can be driven to rotate, and the sliding sleeve follows to drive the drive rod to rotate.

2. The centrifugal on-orbit culture test device according to claim 1, characterized in that: The translation drive mechanism also includes a translation drive source and a translation transmission pair, and the translation drive source drives the outer sleeve to rotate through the translation transmission pair; the rotation drive mechanism also includes a rotation drive source and a rotation transmission pair, and the rotation drive source drives the rotation shaft to rotate through the rotation transmission pair; the translation drive source and the rotation drive source are symmetrically installed on the fixed disk along the radial direction of the fixed disk.

3. The centrifugal on-orbit culture test device according to claim 1, characterized in that: The translation drive mechanism also includes a support frame, the inner wall surface of the outer sleeve is provided with an internal thread, the outer wall surface of the inner sleeve is provided with an external thread, the inner sleeve and the outer sleeve form a transmission connection through threaded matching, the support frame is installed at the end of the inner sleeve, and the end of the sliding sleeve is axially penetrated into the support frame.

4. The centrifugal on-orbit culture test device according to claim 1, characterized in that: A connecting key is installed at the end of the rotating shaft, and a keyway extending in the axial direction is provided on the inner surface of the sliding sleeve. The connecting key is inserted into the keyway so that the rotating shaft and the sliding sleeve are fixedly connected in the circumferential direction.

5. The centrifugal on-orbit culture test device according to claim 1, characterized in that: The middle part of the driving rod in the longitudinal direction is installed on the end of the sliding sleeve, and the two ends of the driving rod in the longitudinal direction are respectively hinged with driven rods, and a culture chamber is installed at the end of any driven rod; the end of the driving rod in the longitudinal direction is provided with a first limiting part, and the position of the driven rod corresponding to the first limiting part is provided with a second limiting part, the first limiting part is a semicircular arc structure, and the second limiting part is a quarter circular arc structure, and the first limiting part and the second limiting part abut against each other to limit the swing of the driven rod.

6. The centrifugal on-orbit culture test device according to claim 2, characterized in that: The translation transmission pair includes a translation main gear and a translation sub gear that mesh with each other, the translation main gear is installed at the power output end of the translation drive source for outputting power, and the translation sub gear is installed at the head end of the outer sleeve for receiving the power output from the translation drive source to drive the outer sleeve to rotate; The rotation transmission pair includes a rotation main gear and a rotation sub gear that mesh with each other, the rotation main gear is installed at the power output end of the rotation drive source for outputting power, and the rotation sub gear is installed at the head end of the rotation shaft for receiving the power output from the rotation drive source to drive the rotation of the rotation shaft; The rotating secondary gear is arranged to avoid the rotating main gear.

7. The centrifugal on-orbit culture test device according to claim 1, characterized in that: There are two coaxially arranged fixed plates, and two corresponding transmission rod assemblies are provided. The lengths of the driving rods corresponding to the two transmission rod assemblies are different.

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