A direct drive device for rotating a jukebox turntable

Abstract

This application discloses a direct-drive rotary optical disc drive (CDDD) for optical disc libraries, belonging to the technical field of high-capacity optical storage devices. It mainly includes a top plate at the top and a bottom plate at the bottom, forming an accommodating space between the top and bottom plates; an optical disc library assembly rotatably mounted within the accommodating space, the assembly having an upper shaft suitable for rotation; a second gear mounted at the bottom of the upper shaft; a servo motor mounted on the top plate; and a first gear mounted at the output end of the servo motor, meshing with the second gear; the first and second gears employ double-tooth meshing. This CDDD rotary direct-drive device, through double-tooth meshing, effectively reduces backlash, achieves higher transmission accuracy, meets the high-precision positioning requirements of optical storage devices for the CDDD, and thus improves the accuracy and reliability of data storage and retrieval.

Description

Technical Field

[0001] This application relates to the field of high-capacity optical storage device technology, specifically to a rotary direct drive device for optical disc library. Background Technology

[0002] In the field of optical storage, rotary storage devices, as high-capacity optical storage devices, are widely used for data storage and management. Traditional rotary drive methods typically use gearboxes to reduce the rotation speed and increase the torque to meet the driving requirements of the rotary storage device.

[0003] For example, the patent with publication number CN108735238A discloses a double-layer rotating cage type movable optical disc library. This patent realizes the rotation of the cage through a speed reduction gearbox, and adopts two rotating cages to work simultaneously without affecting each other. The bottom of the optical disc library is equipped with four universal wheels, which can move in any direction. The server adopts the latest PCIE interface, and the internal optical disc storage capacity reaches 100TB, which greatly improves the optical disc access efficiency and increases the storage capacity of the optical disc library.

[0004] However, the gearbox-driven rotation method has many drawbacks, such as complex structure and large size, which increases the overall size and weight of the equipment. At the same time, the backlash between the gears inside the gearbox will reduce the transmission accuracy, making it difficult to meet the increasingly demanding optical storage application scenarios with high-precision positioning requirements. Moreover, the gearbox has high maintenance costs and is prone to failure, affecting the normal operation of the equipment. With the continuous development of optical storage technology, the performance requirements of rotary storage devices are also getting higher and higher, and there is an urgent need for a new driving technology to overcome the shortcomings of the traditional gearbox driving method. Therefore, it is necessary to provide a direct drive device for optical disc library rotary drum rotation to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a direct drive device for rotating optical disc library drums, which effectively reduces backlash through double-tooth meshing. Compared with traditional drive methods, it can achieve higher transmission accuracy, meet the high-precision positioning requirements of optical storage devices for the drum, and thus improve the accuracy and reliability of data storage and retrieval.

[0007] The technical solution adopted by this application to solve its technical problem is: a direct-drive rotating optical disc library drum device, comprising a top plate at the top and a bottom plate at the bottom, forming an accommodating space between the top plate and the bottom plate; an optical disc library assembly rotatably mounted in the accommodating space, the optical disc library assembly having an upper shaft suitable for rotation; a second gear mounted at the bottom of the upper shaft; a servo motor mounted on the top plate; and a first gear mounted at the output end of the servo motor, the first gear meshing with the second gear; wherein the first gear and the second gear employ double-tooth meshing.

[0008] Furthermore, the first gear has 22 teeth, and the second gear has 264 teeth.

[0009] Furthermore, the speed ratio between the first gear and the second gear is 12.

[0010] Furthermore, the optical disc library assembly includes a central fixing tube installed at the bottom of the second gear; a lower disc installed at the bottom of the central fixing tube; at least one set of fixing discs evenly fitted onto the lower disc; six sets of rotating cages rotatably mounted on the fixing discs, each rotating cage being provided with a disc storage box; and the central fixing tube installed at the bottom of the second gear.

[0011] Furthermore, an upper bearing seat is installed on the top of the upper shaft, which is fixed to the top plate. An origin sensing plate is fixedly installed on the top of the upper shaft. A sensor cover is fixed on the upper bearing seat. A marking pin corresponding to the position of the storage tray is provided on the second gear. A photoelectric switch is fixedly installed on the top of the upper bearing seat. A proximity switch is fixedly installed on the top plate.

[0012] Furthermore, a lifting assembly is provided at the upper end of the top plate. The lifting assembly includes a support base fixedly installed on the top plate, a cylinder fixedly installed on the support base, a connecting block fixedly installed at the output end of the cylinder, an mounting plate fixedly installed on the connecting block, and the mounting plate fixedly installed with the servo motor. A vertical slide rail is provided on the support base, a slider is slidably installed on the slide rail, and the slider is fixedly installed with the connecting block.

[0013] Furthermore, an electric cylinder is fixedly installed at the bottom of the base plate, a positioning pin is fixedly installed at the output end of the electric cylinder, and a positioning hole is provided at the bottom of the lower disc, the positioning hole being adapted to the positioning pin.

[0014] Furthermore, a third gear is fixedly installed at the bottom of the first gear. The third gear has the same shape as the first gear, and its hardness is less than that of the second gear.

[0015] Furthermore, a lubrication assembly is provided at the bottom of the top plate. The lubrication assembly includes a bracket fixedly installed at the bottom of the top plate, an oil pump fixedly installed on the bracket, and the output end of the oil pump connected to a lubricating oil storage device. The output end of the oil pump is connected to an oil delivery pipe, and the end of the oil delivery pipe is connected to an oil injector. A gear box is fixedly installed at the bottom of the top plate. The gear box is hollow, and the oil injector penetrates into the interior of the gear box. A solenoid valve is provided on the oil delivery pipe.

[0016] Furthermore, a baffle is fixedly installed on one side of the gear box opening, and the baffle surrounds the bottom of the gear box to form an oil storage tank.

[0017] The optical disc library rotary direct drive device provided in this application has the following advantages:

[0018] 1. By using a double-tooth meshing method, the backlash is effectively reduced. Compared with the traditional driving method, it can achieve higher transmission accuracy, meet the requirements of optical storage devices for high-precision positioning of the rotating cage, and thus improve the accuracy and reliability of data storage and retrieval.

[0019] 2. The design of six stations on the same layer of the rotating drum and the perfect matching of the dual-tooth speed ratio enable the rotating drum to operate accurately and stably when switching stations, thereby improving the working efficiency and performance of the optical storage device.

[0020] 3. By incorporating a lubrication system, lubricating oil can be sprayed onto the gears when they are not in operation, thereby reducing friction during double-tooth meshing and increasing the service life of the gears.

[0021] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0023] In the attached diagram:

[0024] Figure 1 This is a 3D physical image of a direct-drive rotating disc drive for optical disc libraries according to this application;

[0025] Figure 2 This is a schematic diagram of the overall structure of a direct-drive optical disc library drum device according to this application. Figure 1 ;

[0026] Figure 3 for Figure 1 A schematic diagram of the overall structure of the CD-ROM library component;

[0027] Figure 4 for Figure 3 Exploded view of the overall structure;

[0028] Figure 5 for Figure 3 A partial structural diagram at point A in the middle;

[0029] Figure 6 for Figure 3 Schematic diagram of the partial structure at point B;

[0030] Figure 7 for Figure 4 A schematic diagram of the partial structure at point C;

[0031] Figure 8 This is a schematic diagram of the overall structure of a direct-drive optical disc library drum device according to this application. Figure 2 ;

[0032] Figure 9 This is a schematic diagram of the overall structure of a direct-drive optical disc library drum device according to this application. Figure 3 ;

[0033] Figure 10 for Figure 8 A schematic diagram of the partial structure at point D;

[0034] Figure 11 for Figure 9 A partial structural diagram at point E in the middle;

[0035] Figure 12 for Figure 9 A schematic diagram of the overall structure of the intermediate lubrication assembly;

[0036] Figure 13 for Figure 12 Schematic diagram of the internal structure of the gearbox;

[0037] The following are the labeling elements in the figure:

[0038] 1. Frame components; 11. Base plate; 12. Columns; 13. Top plate; 14. Electric cylinder; 15. Positioning pins;

[0039] 2. Optical disc library assembly; 21. Rotating cage; 22. Lower disc; 221. Positioning hole; 23. Upper bearing seat; 24. Origin sensing plate; 25. Marking pin; 26. Fixing disc; 261. Mounting hole; 27. Photoelectric switch; 28. Proximity switch; 29. ​​Lower bearing seat; 210. Lower shaft; 211. Sensor cover; 212. Storage tray; 213. Rotating pin;

[0040] 3. Drive assembly; 31. Servo motor; 32. First gear; 33. Second gear; 34. Gearbox; 341. Baffle; 35. Third gear;

[0041] 4. Lifting assembly; 41. Support base; 42. Cylinder; 43. Slide rail; 44. Slider; 45. Connecting block; 46. Mounting plate;

[0042] 5. Lubrication components; 51. Bracket; 52. Oil pump; 53. Oil delivery pipe; 54. Solenoid valve; 55. Oil injector. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0045] like Figure 1 As shown, this application provides a rotary direct drive device for optical disc library, which belongs to the category of high-capacity optical storage devices. The rotary direct drive device for optical disc library includes a support frame assembly 1. The frame assembly 1 includes a bottom plate 11 located at the bottom. The bottom plate 11 is usually placed on the bottom surface or platform of the working area. At least four sets of columns 12 are fixedly installed at the upper end of the bottom plate 11. A top plate 13 is fixedly installed at the upper end of the columns 12, thereby forming an accommodating space between the top plate 13 and the bottom plate 11. An optical disc library assembly 2 is disposed in the accommodating space. The optical disc library assembly 2 is used to store optical discs and to retrieve and place optical discs when needed.

[0046] like Figure 2 - Figure 7 As shown, the optical disc library assembly 2 includes an upper bearing seat 23 fixedly mounted on the top plate 13. An upper shaft (not shown in the figure) is installed inside the upper bearing seat 23. A second gear 33 is fixedly mounted on the bottom of the upper shaft. A central fixing tube (not shown in the figure) is fixedly mounted on the bottom of the second gear 33. A lower disk 22 is fixedly mounted on the bottom of the central fixing tube. Thus, when the upper shaft rotates, the lower disk 22 can be driven to rotate synchronously through the central fixing tube.

[0047] Meanwhile, a lower shaft 210 is fixedly installed at the bottom of the lower disc 22, and a lower bearing seat 29 is fixedly installed at the upper end of the base plate 11, so that the lower shaft 210 can be installed in the lower bearing seat 29 and is suitable to rotate synchronously with the lower disc 22 to support the lower disc 22.

[0048] like Figure 4 and Figure 7 As shown, at least one set of fixing discs 26 are evenly fitted on the central fixing tube along the vertical direction. The fixing discs 26 have mounting holes 261, so that they can be easily installed on the central fixing tube.

[0049] Meanwhile, six sets of pivot pins 213 are fixedly installed on the fixed disk 26 along the circumferential direction. Six sets of rotating cages 21 are rotatably mounted on the pivot pins 213. Each rotating cage 21 is equipped with a disc storage box 212 for holding optical discs. It can be understood that when it is necessary to place or retrieve an optical disc from the disc storage box 212, the rotating cage 21 is rotated around the pivot pins 213 by an external lever and extends out of the outer end of the fixed disk 26. Then, the optical disc can be placed or retrieved by a robotic arm. The working principle of this part belongs to the prior art and can be referred to relevant patents.

[0050] To switch the positions of the six disc trays 212 for easy insertion and removal of discs as needed, such as... Figure 2 - Figure 3 and Figure 6 As shown, a drive assembly 3 is provided on the top plate 13. The drive assembly 3 includes a servo motor 31 fixedly mounted on the top plate 13. A rotating shaft (not shown in the figure) is fixedly mounted on the output end of the servo motor 31. The rotating shaft passes through the top plate 13 and enters the accommodating space. At the same time, a first gear 32 is fixedly mounted on the rotating shaft. The first gear 32 meshes with a second gear 33. When the servo motor 31 works, it can drive the first gear 32 to rotate, which in turn drives the second gear 33 to rotate synchronously. During the rotation of the second gear 33, it will drive the central fixed tube to rotate, which in turn drives the fixed disk 26 to rotate, thereby enabling the six sets of storage trays 212 to switch positions.

[0051] More preferably, in order to protect the first gear 32, a gear box 34 is fixedly installed at the bottom of the top plate 13. The gear box 34 is hollow and surrounds the outside of the first gear 32, thereby effectively protecting the first gear 32.

[0052] It should be noted that since the first gear 32 and the second gear 33 mesh directly, there is no complex transmission structure such as a gearbox in between, which reduces energy loss and transmission error.

[0053] Meanwhile, the first gear 32 and the second gear 33 adopt double-tooth meshing, and the first gear 32 has 22 teeth, while the second gear 33 has 264 teeth. The speed ratio of the first gear 32 and the second gear 33 is 12. Thus, when the first gear 32 rotates two revolutions, the second gear 33 rotates one-sixth of a revolution, which drives the rotating cage 21 to rotate one work position. This double-tooth meshing method can effectively reduce backlash. In traditional single-tooth meshing transmission, the wear or manufacturing error of a single tooth can easily lead to a large backlash, affecting the transmission accuracy. However, this application adopts double-tooth meshing. Even if one tooth has a certain error or wear, the other tooth can still ensure stable transmission, thereby greatly reducing the impact of backlash on transmission accuracy. Throughout the process, the servo motor 31 can monitor its own speed, torque and other parameters in real time, and adjust the output according to these parameters to ensure the rotation accuracy and stability of the rotating cage 21.

[0054] In order to control the position of the six sets of storage trays 212, such as Figure 2 - Figure 5 As shown, a point sensing plate 24 is fixedly installed at the top of the upper shaft, a sensor cover 211 is fixedly installed on the upper bearing seat 23, a marking pin 25 corresponding to the position of the storage tray 212 is provided on the second gear 33, a photoelectric switch 27 is fixedly installed at the top of the upper bearing seat 23, and a proximity switch 28 is fixedly installed on the top plate 13.

[0055] In this embodiment, a PLC control system is also provided to coordinate the collaborative operation of various electrical components;

[0056] In summary, when the computer gives a disk retrieval signal, the PLC controller sends a pulse to control the servo motor 31 to rotate. When the rotation reaches the target position, the proximity switch 28 senses the marker pin 25 and gives a stop rotation signal. After receiving the signal from the proximity switch 28, the PLC controller controls the servo motor 31 to stop rotating.

[0057] After the disc is removed, other supporting mechanisms give a signal, and the PLC controller controls the servo motor 31 to rotate so that the rotating cage 21 moves to the origin. The photoelectric switch 27 senses the origin sensor 24, that is, after the rotating cage 21 returns to the origin position, it gives a signal, and the servo motor 31 stops rotating, completing the whole process.

[0058] In this embodiment, firstly, the traditional gearbox is replaced by a new structure, which simplifies the structure of the rotary storage device, reduces the size and weight of the device, and lowers the manufacturing cost and maintenance difficulty of the device.

[0059] Secondly, the double-tooth meshing method effectively reduces the backlash, which can achieve higher transmission accuracy compared with the traditional driving method, meeting the high-precision positioning requirements of optical storage devices for the rotating cage 21, thereby improving the accuracy and reliability of data storage and retrieval.

[0060] Furthermore, the six-station design of the rotating drum 21 and the perfect match of the dual-tooth speed ratio enable the rotating drum 21 to operate accurately and stably when switching stations, thereby improving the working efficiency and performance of the optical storage device.

[0061] Example 2:

[0062] During the long-term and repeated meshing of the first gear 32 and the second gear 33, the contact points are prone to wear. Due to the positional relationship of the first gear 32, disassembly and replacement are relatively difficult. Therefore, this embodiment improves upon embodiment one by providing a structure to protect the first gear 32. Specifically:

[0063] like Figure 8 - Figure 10 As shown, a lifting assembly 4 is provided at the upper end of the top plate 13. The lifting assembly 4 includes a support base 41 fixedly installed on the top plate 13. A cylinder 42 is fixedly installed on the support base 41. A connecting block 45 is fixedly installed at the output end of the cylinder 42. An mounting plate 46 is fixedly installed on the connecting block 45. Thus, under the drive of the cylinder 42, the mounting plate 46 can reciprocate in the vertical direction.

[0064] It should be noted that in this embodiment, the servo motor 31 is no longer fixedly installed with the top plate 13, but is fixedly installed with the mounting plate 46. Thus, the servo motor 31 can reciprocate in the vertical direction synchronously with the mounting plate 46. When it is not necessary to pick up or put down the optical disc, the servo motor 31 can be driven to move vertically upward, driving the second gear 33 to move upward, and causing the first gear 32 and the second gear 33 to disengage. This can prevent contact wear of the first gear 32 and the second gear 33 in the non-working state under the circumstances of equipment vibration or other emergencies, thereby effectively extending the life of the first gear 32 and the second gear 33 to a certain extent. When it is necessary to pick up or put down the optical disc, the second gear 33 can be reset.

[0065] To prevent the first gear 32 from deflecting after the first gear 32 and the second gear 33 disengage, such as... Figure 9 and Figure 11 As shown, an electric cylinder 14 is fixedly installed at the bottom of the base plate 11. A positioning pin 15 is fixedly installed at the output end of the electric cylinder 14. At the same time, a positioning hole 221 is provided at the bottom of the lower disc 22. The positioning hole 221 is adapted to the positioning pin 15. Thus, when the first gear 32 and the second gear 33 are disengaged, the electric cylinder 14 extends, allowing the positioning pin 15 to enter the positioning hole 221 and fix the lower disc 22, thereby maintaining the position of the first gear 32.

[0066] To prevent the second gear 33 from deflecting, such as Figure 10As shown, a vertical slide rail 43 is provided on the support base 41, and a slider 44 is slidably mounted on the slide rail 43. The slider 44 is fixedly mounted to the connecting block 45. Thus, through the cooperation of the slider 44 and the slide rail 43, the vertical movement of the second gear 33 can be guided to prevent the second gear 33 from deflecting.

[0067] To further protect the first gear 32 and the second gear 33, such as Figure 13 As shown, a third gear 35 is fixedly installed at the bottom of the first gear 32. The third gear 35 has the same shape as the first gear 32 and its hardness is less than that of the second gear 33. So when the first gear 32 disengages from the second gear 33, the third gear 35 rises synchronously and engages with the second gear 33. In this way, the second gear 33 can be further limited to prevent it from deflecting. At the same time, because the third gear 35 has less hardness, it can buffer the second gear 33 in the event of vibration or other emergencies and will not damage the second gear 33.

[0068] like Figure 9 and Figure 12 - Figure 13 As shown, a lubrication assembly 5 is provided at the bottom of the top plate 13. The lubrication assembly 5 is used to apply lubricating oil to the first gear 32 and the second gear 33 to reduce the friction between them.

[0069] The lubrication assembly 5 includes a bracket 51 fixedly installed at the bottom of the top plate 13, on which an oil pump 52 is fixedly installed. The output end of the oil pump 52 is connected to a lubricating oil storage device to facilitate the discharge of lubricating oil.

[0070] Meanwhile, an oil supply pipe 53 is connected to the output end of the oil pump 52, and an oil nozzle 55 is connected to the end of the oil supply pipe 53. The oil nozzle 55 penetrates into the interior of the gear box 34, so that the lubricating oil discharged by the oil pump 52 can be introduced into the oil nozzle 55 through the oil supply pipe 53 and sprayed onto the third gear 35 located at the bottom.

[0071] Furthermore, a solenoid valve 54 is installed on the oil pipeline 53 to facilitate control of the timing of lubricating oil spraying;

[0072] It should be noted that an oil storage hole (not shown in the figure) can be provided on the tooth surface of the third gear 35, so that the lubricating oil sprayed on the tooth surface of the third gear 35 can be retained in the oil storage hole. Then, when the third gear 35 is in the position of meshing with the second gear 33, the servo motor 31 can be started and drive the third gear 35 to rotate slowly. At the same time, the oil nozzle 55 sprays lubricating oil on the tooth surface of the third gear 35.

[0073] As the third gear 35 meshes with the second gear 33, the lubricating oil on the tooth surface of the third gear 35 will reach the tooth surface of the second gear 33 to lubricate the second gear 33.

[0074] Furthermore, such as Figure 13 As shown, a baffle 341 is fixedly installed on one side of the gear box 34 opening. The baffle 341 encloses the bottom of the gear box 34 to form an oil storage tank, so that lubricating oil that may drip from the third gear 35 will enter the oil storage tank. The staff can clean the oil storage tank later to prevent lubricating oil from splashing and contaminating.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A direct-drive rotary disc drive for optical disc libraries, characterized in that: include: A top plate at the top and a bottom plate at the bottom, with an accommodating space between the top plate and the bottom plate; The optical disc library assembly is rotatably mounted within the accommodating space, and the optical disc library assembly has an upper shaft suitable for rotation; The second gear is installed at the bottom of the upper shaft; The first gear is installed at the output end of the servo motor, and the first gear meshes with the second gear; the first gear and the second gear use double-tooth meshing. The top plate is equipped with a lifting assembly, which includes a support base fixedly mounted on the top plate. A cylinder is fixedly mounted on the support base, and a connecting block is fixedly mounted on the output end of the cylinder. A mounting plate is fixedly mounted on the connecting block, and the mounting plate is fixedly mounted to a servo motor. The support base has a vertical slide rail, and a slider is slidably mounted on the slide rail. The slider is fixedly mounted to the connecting block. The servo motor can reciprocate vertically in sync with the mounting plate. When it is not necessary to pick up or put down a disc, the servo motor is driven to move vertically upward, driving the second gear to move upward, causing the first and second gears to disengage. This prevents contact wear between the first and second gears when they are not in operation, in the event of equipment vibration or other emergencies. When it is necessary to pick up or put down a disc, the second gear is reset. An electric cylinder is fixedly mounted on the bottom of the bottom plate, and a positioning pin is fixedly mounted on the output end of the electric cylinder. A positioning hole is provided on the bottom of the lower disc, and the positioning hole is adapted to the positioning pin. When the first and second gears disengage, the electric cylinder extends, allowing the positioning pin to enter the positioning hole and fix the lower disc, maintaining the position of the first gear and preventing the first gear from deflecting after disengagement. A third gear is fixedly installed at the bottom of the first gear. The third gear has the same shape as the first gear and its hardness is less than that of the second gear. So when the first gear disengages from the second gear, the third gear rises synchronously and engages with the second gear.

2. The optical disc library rotary direct drive device according to claim 1, characterized in that: The bottom of the top plate is equipped with a lubrication assembly, which includes a bracket fixedly installed at the bottom of the top plate. An oil pump is fixedly installed on the bracket, and the output end of the oil pump is connected to a lubricating oil storage device. The output end of the oil pump is connected to an oil delivery pipe, and the end of the oil delivery pipe is connected to an oil injector. A gear box is fixedly installed at the bottom of the top plate. The gear box is hollow, and the oil injector penetrates into the interior of the gear box. A solenoid valve is installed on the oil delivery pipe. A baffle is fixedly installed on the open side of the gear box, and the baffle surrounds the bottom of the gear box to form an oil storage tank.

3. The optical disc library rotary direct drive device according to claim 1, characterized in that: The first gear has 22 teeth, and the second gear has 264 teeth.

4. The optical disc library rotary direct drive device according to claim 1, characterized in that: The speed ratio between the first gear and the second gear is 12.

5. The optical disc library rotary direct drive device according to claim 1, characterized in that: The optical disc library assembly includes: a central fixing tube mounted on the bottom of the second gear; a lower disc mounted on the bottom of the central fixing tube; at least one set of fixing discs evenly fitted onto the lower disc; six sets of rotating cages rotatably mounted on the fixing discs, each rotating cage having a disc storage box; and the central fixing tube mounted on the bottom of the second gear.

6. The optical disc library rotary direct drive device according to claim 1, characterized in that: An upper bearing housing is installed on the top of the upper shaft, and the upper bearing housing is fixed to the top plate. An origin sensing plate is fixedly installed on the top of the upper shaft. A sensor cover is fixed on the upper bearing housing. A marking pin corresponding to the position of the storage tray is provided on the second gear. A photoelectric switch is fixedly installed on the top of the upper bearing housing. A proximity switch is fixedly installed on the top plate.

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