Optical disc taking and placing device and method

Abstract

The invention belongs to a material grabbing device in the field of optical storage equipment, particularly relates to the field of optical disc taking and placing, and discloses an optical disc taking and placing device and method.The optical disc taking and placing device comprises a supporting cylinder, a through hole is formed in the bottom of the supporting cylinder, a shaft rod is fixed in the through hole, and a permanent magnet claw arm is rotationally connected to the outer side of the shaft rod; the permanent magnet claw arm penetrates through the through hole and is connected with the hook block, a fixing ring is fixed to the bottom of the iron core, a hydraulic mechanism is fixed in the bottom of the supporting cylinder, the hydraulic mechanism penetrates through the fixing ring and is connected with the permanent magnet claw arm, and a pressing fixing mechanism is fixed to the bottom of the supporting cylinder. The abutting fixing mechanism is connected with the hydraulic mechanism through a first connecting pipeline. According to the optical disc picking and placing device, the action of the three permanent magnet claw arms is controlled through the magnetic pole interaction of the permanent magnets and the electromagnets, compared with traditional mechanical driving, the advantages of no friction loss and high control precision are achieved, and the reliability problem caused by mechanical abrasion in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of material grabbing devices of optical storage equipment, more particularly to the field of optical disc taking and placing, and specifically to an optical disc taking and placing device and method. BACKGROUND

[0002] In the field of data storage technology, optical storage is widely used in backup, archiving and other scenarios due to its large capacity characteristics. With the explosive growth of data volume, large-capacity storage solutions have become a trend, and there is an urgent need for an institution that can stably and efficiently take and place optical discs.

[0003] The existing grabbing technology has obvious defects: first, relying solely on mechanical support force to support the optical disc, it is easy to cause the optical disc to fall off due to shaking during high-speed movement; second, the friction loss generated by the long-term operation of the mechanical structure causes the grabbing action to fail; third, it cannot accurately grab a single optical disc, limiting the efficiency of the storage equipment; and fourth, during the process of grabbing a single or multiple optical discs, the optical discs are not pressed and are easy to shake, making the taking and placing unstable. SUMMARY

[0004] The purpose of the present application is to provide an optical disc taking and placing device and method, which accurately controls the opening and closing action of the three claws through magnetic force, realizes the stable taking and placing of a single optical disc, solves the problems of instability and structural wear in the prior art, and improves the management efficiency of optical storage equipment.

[0005] To achieve the above purpose, the present application provides the following technical scheme: an optical disc taking and placing device, comprising a support cylinder, a mounting frame is fixed at the top of the support cylinder, a permanent magnet is fixed at the inner top of the support cylinder, an electromagnet is fixed at the inner side of the support cylinder, the permanent magnet is fixed at the top of the electromagnet, an iron core is fixed at the center of the electromagnet, a through hole is formed in the bottom of the support cylinder, a shaft rod is fixed in the through hole, a permanent magnet claw arm is rotatably connected to the outer side of the shaft rod, and the permanent magnet claw arm penetrates the through hole and is connected with a hook block.

[0006] A fixing ring is fixed at the bottom of the iron core, a hydraulic mechanism is fixed in the bottom of the support cylinder, the hydraulic mechanism passes through the fixing ring and is connected with the permanent magnet claw arm, a pressing fixing mechanism is fixed at the bottom of the support cylinder, and the pressing fixing mechanism is connected with the hydraulic mechanism through a first connecting pipeline.

[0007] Preferably, the permanent magnet claw arm is provided with three, and the three permanent magnet claw arms are uniformly distributed on the support cylinder in a circumferential direction, three grooves are formed in the outer side of the support cylinder, and the permanent magnet claw arm is located in the groove.

[0008] Preferably, the hydraulic mechanism comprises first oil cylinders fixed in the bottom of the supporting cylinder, the first oil cylinders are provided with three first pistons slidably connected in each of the first oil cylinders, and the first pistons are connected with the inner top of the first oil cylinders through first springs.

[0009] Preferably, the top of the first piston is fixed with a connecting rope, the connecting rope penetrates the top of the first oil cylinder, and the connecting rope passes through a fixed ring and is connected with the permanent magnetic claw arm.

[0010] Preferably, the bottom of the first oil cylinder is fixed with a second oil cylinder, a second piston is slidably connected in the second oil cylinder, the second piston is connected with the inner bottom of the second oil cylinder through a second spring, the top of the second piston is fixed with a movable block, and the movable block penetrates the top of the second oil cylinder and the bottom of the first oil cylinder.

[0011] Preferably, the pressing fixing mechanism comprises third oil cylinders fixed in the bottom of the supporting cylinder, the third oil cylinders are connected with the first oil cylinders through first connecting pipelines, the third oil cylinders are provided with three third pistons slidably connected in each of the third oil cylinders, the bottom of the third piston is fixed with a sleeve, the sleeve penetrates the bottom of the third oil cylinder, a moving column is slidably connected in the sleeve, the moving column is connected with the inner top of the sleeve through a fourth spring, the moving column and the sleeve form an extension structure, and the bottom of the moving column is fixed with a rubber ball.

[0012] Preferably, the inner end face of the moving column is provided with clamping grooves which are distributed on the moving column at equal intervals.

[0013] Preferably, the sleeve is fixed with a fourth oil cylinder, and the fourth oil cylinder is connected with the second oil cylinder through a second connecting pipeline.

[0014] Preferably, a fourth piston is slidably connected in the fourth oil cylinder, and a clamping rod is fixed on the outer side of the fourth piston, the clamping rod penetrates one side of the fourth oil cylinder and one side of the sleeve.

[0015] A disc taking and placing method comprises the following steps:

[0016] S1, when the electromagnet is powered on, a magnetic pole repelling the permanent magnetic claw arm is generated, at this time, the magnetism of the electromagnet is much stronger than the magnetism of the permanent magnet guiding the magnetism of the iron core, thereby pushing the top end of the three permanent magnetic claw arms to move outward, the permanent magnetic claw arms rotate around the shaft, the lower end of the three permanent magnetic claw arms contracts inward, and the lower part of the three permanent magnetic claw arms is smoothly inserted into the center hole of the disc;

[0017] S2, when the current is disconnected, the electromagnet is disabled, the permanent magnet guides the magnetism of the iron core to generate an attractive force, the top end of the three permanent magnetic claw arms is attracted to the central axis, and the lower end of the three permanent magnetic claw arms is opened outward, thereby completing the grabbing of the disc;

[0018] S3. Before fully gripping the disc, the sleeve and the moving column can move relative to each other. The fourth spring, the moving column and the rubber ball can be used together to press and fix the disc. It is suitable for gripping single or multiple discs. When the lower ends of the three permanent magnet claw arms are fully open, the locking levers are locked into the corresponding slots to lock the moving column.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This optical disc loading and unloading device achieves the innovative purpose of magnetic coupling drive. It controls the movement of three permanent magnet claw arms through the interaction of the magnetic poles of permanent magnets and electromagnets. Compared with traditional mechanical drive, it has the advantages of no friction loss and high control precision, and solves the reliability problem caused by mechanical wear in the existing technology.

[0021] 2. This optical disc picking and placing device achieves the purpose of optimizing the three-claw structure. The bottom of each of the three permanent magnet claw arms is fixed with a hook block. With the help of magnetic force, it realizes precise control of "opening and closing-clamping" of the optical disc, ensuring reliable picking of the optical disc and significantly improving management efficiency.

[0022] 3. This optical disc pick-and-place device has stable gripping performance. The combination of the static holding force of the permanent magnet and the dynamic driving force of the electromagnet enables the gripping mechanism to effectively resist external interference during operation and prevent the optical disc from shaking and falling off. Compared with the existing structure that relies solely on supporting force, the reliability is significantly improved.

[0023] 4. This optical disc picking and placing device uses three permanent magnet claw arms to pick up the optical disc, and a fourth spring, a moving column and a rubber ball are used to press and fix the optical disc in place. This device is suitable for stably picking up single or multiple optical discs. Attached Figure Description

[0024] Figure 1 This is a 3D physical image of the contraction posture of the present invention;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the contraction posture of the present invention;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention in its normal posture;

[0027] Figure 4 This is a schematic diagram of the frontal cross-sectional structure of the contraction posture of the present invention;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention in its normal orientation.

[0029] Figure 6 This is a schematic diagram of the connection structure of the hydraulic mechanism, the first connecting pipe, the pressure fixing mechanism, and the second connecting pipe of the present invention;

[0030] Figure 7 This is a schematic diagram of the connection structure between the hydraulic mechanism and the first connecting pipe of the present invention;

[0031] Figure 8 This is a schematic diagram of the connection structure of the first connecting pipe, the pressure fixing mechanism, and the second connecting pipe of the present invention;

[0032] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0033] Figure 10 For the present invention Figure 8 Enlarged structural diagram at point B.

[0034] In the diagram: 1. Support cylinder; 2. Mounting bracket; 3. Permanent magnet; 4. Electromagnet; 5. Iron core; 6. Through hole; 7. Shaft; 8. Permanent magnet claw arm; 9. Groove; 10. Hook block; 11. Fixing ring; 12. Hydraulic mechanism; 1201. First cylinder; 1202. First spring; 1203. First piston; 1204. Connecting rope; 1205. Second cylinder; 1206. Second spring; 1207. Second piston; 1208. Movable block; 13. First connecting pipe; 14. Pressing and fixing mechanism; 1401. Third cylinder; 1402. Third piston; 1403. Sleeve; 1404. Fourth spring; 1405. Moving column; 1406. Slot; 1407. Rubber ball; 1408. Fourth cylinder; 1409. Fourth piston; 1410. Locking rod; 15. Second connecting pipe. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-10 The present invention provides a technical solution: a CD loading and unloading device, including a support cylinder 1, a mounting bracket 2 fixed to the top of the support cylinder 1, a permanent magnet 3 fixed to the inner top of the support cylinder 1, an electromagnet 4 fixed to the inner side of the support cylinder 1, the permanent magnet 3 fixed to the top of the electromagnet 4, an iron core 5 fixed to the center of the electromagnet 4, a through hole 6 opened at the bottom of the support cylinder 1, a shaft 7 fixed in the through hole 6, a permanent magnet claw arm 8 rotatably connected to the outer side of the shaft 7, the permanent magnet claw arm 8 passing through the through hole 6 and connected to a hook block 10.

[0037] A fixing ring 11 is fixed at the bottom of the iron core 5, and a hydraulic mechanism 12 is fixed inside the bottom of the support cylinder 1. The hydraulic mechanism 12 passes through the fixing ring 11 and is connected to the permanent magnet claw arm 8. A pressing and fixing mechanism 14 is fixed at the bottom of the support cylinder 1. The pressing and fixing mechanism 14 is connected to the hydraulic mechanism 12 through the first connecting pipe 13.

[0038] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, there are three permanent magnet claw arms 8, and the three permanent magnet claw arms 8 are evenly distributed on the support cylinder 1 in the circumference. Three grooves 9 are opened on the outer side of the support cylinder 1, and the permanent magnet claw arms 8 are located in the grooves 9. After the support cylinder 1 and the three permanent magnet claw arms 8 are inserted into the center hole of the optical disc, the tops of the three permanent magnet claw arms 8 move towards the central axis, and the lower ends open outward to lift and grab the optical disc.

[0039] In this embodiment, as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the hydraulic mechanism 12 includes a first oil cylinder 1201, which is fixed inside the bottom of the support cylinder 1. There are three first oil cylinders 1201, and a first piston 1203 is slidably connected inside each first oil cylinder 1201. The first piston 1203 is connected to the inner top of the first oil cylinder 1201 through a first spring 1202. The first piston 1203 can slide inside the first oil cylinder 1201, and the first spring 1202 can assist the first piston 1203 to reset.

[0040] In this embodiment, as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a connecting rope 1204 is fixed to the top of the first piston 1203, and the connecting rope 1204 passes through the top of the first oil cylinder 1201. The connecting rope 1204 passes through the fixing ring 11 and is connected to the permanent magnet claw arm 8. When the tops of the three permanent magnet claw arms 8 open outward, the first piston 1203 will move upward under the action of the connecting rope 1204. When the tops of the three permanent magnet claw arms 8 converge inward, the first piston 1203 will automatically spring open under the action of the first spring 1202.

[0041] In this embodiment, as Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9As shown, a second cylinder 1205 is fixed to the bottom of the first cylinder 1201, and a second piston 1207 is slidably connected inside the second cylinder 1205. The second piston 1207 is connected to the bottom of the second cylinder 1205 through a second spring 1206. A movable block 1208 is fixed to the top of the second piston 1207, and the movable block 1208 passes through the top of the second cylinder 1205 and the bottom of the first cylinder 1201. When the first piston 1203 moves down to the bottom, it can squeeze the movable block 1208. When the movable block 1208 moves downward, and the first piston 1203 moves upward, the second piston 1207 and the movable block 1208 can automatically bounce up under the action of the second spring 1206.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 10 As shown, the pressing and fixing mechanism 14 includes a third hydraulic cylinder 1401, which is fixed to the bottom of the support cylinder 1 and connected to the first hydraulic cylinder 1201 via a first connecting pipe 13. Three third hydraulic cylinders 1401 are provided, and a third piston 1402 is slidably connected inside each third hydraulic cylinder 1401. A sleeve 1403 is fixed to the bottom of the third piston 1402, and the sleeve 1403 penetrates the bottom of the third hydraulic cylinder 1401. A moving column 1405 is slidably connected inside the sleeve 1403, and the moving column 1405 is connected to the inner top of the sleeve 1403 via a fourth spring 1404. The movable column 1405 and the sleeve 1403 form a telescopic structure, and a rubber ball 1407 is fixed at the bottom of the movable column 1405. The first connecting pipe 13 serves to connect the first oil cylinder 1201 and the third oil cylinder 1401. When the first piston 1203 moves down, the third piston 1402 can move down under the action of oil pressure, thereby driving the sleeve 1403 and the movable column 1405 to move down as a whole. The rubber ball 1407 will press against the top of the optical disc, which will help to strengthen the stability. The sleeve 1403, the fourth spring 1404, the movable column 1405 and the rubber ball 1407 can be used together to press and fix one or more optical discs.

[0043] In this embodiment, as Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 10 As shown, the inner end face of the movable column 1405 is provided with a slot 1406, and the slots 1406 are evenly distributed on the movable column 1405. When the first piston 1203 moves down to the bottom, the movable column 1405 will be automatically locked.

[0044] In this embodiment, asFigure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 10 As shown, a fourth hydraulic cylinder 1408 is fixed on the sleeve 1403, and the fourth hydraulic cylinder 1408 is connected to the second hydraulic cylinder 1205 through the second connecting pipe 15. The second connecting pipe 15 serves to connect the second hydraulic cylinder 1205 and the fourth hydraulic cylinder 1408.

[0045] In this embodiment, as Figure 4 , Figure 5 , Figure 8 and Figure 10 As shown, a fourth piston 1409 is slidably connected inside the fourth cylinder 1408, and a locking rod 1410 is fixed on the outside of the fourth piston 1409. The locking rod 1410 passes through one side of the fourth cylinder 1408 and one side of the sleeve 1403. When the first piston 1203 moves down to the bottom and presses the movable block 1208 and the second piston 1207 to move down, the fourth piston 1409 will move under the action of oil pressure. When the first piston 1203 moves down to the bottom, the locking rod 1410 is engaged in the corresponding slot 1406 to lock the moving column 1405.

[0046] According to another aspect of the present invention, a method for loading and unloading an optical disc is provided, comprising the following steps:

[0047] S1. When the electromagnet 4 is energized, it generates magnetic poles that repel the permanent magnet claw arm 8. At this time, the magnetism of the electromagnet 4 is much stronger than the magnetism of the permanent magnet 3 to conduct magnetism to the iron core 5, thereby pushing the top of the three permanent magnet claw arms 8 to move outward, the permanent magnet claw arms 8 rotate around the shaft 7, the lower ends of the three permanent magnet claw arms 8 retract inward, and the lower parts of the three permanent magnet claw arms 8 are smoothly inserted into the center hole of the optical disc.

[0048] S2. When the current is disconnected, the electromagnet 4 fails, and the permanent magnet 3 conducts magnetic field to the iron core 5 to generate a force of attraction, which attracts the tops of the three permanent magnet claw arms 8 to move towards the central axis, and the lower ends of the three permanent magnet claw arms 8 open outward, thereby completing the gripping of the optical disc.

[0049] S3. Before fully gripping the optical disc, the sleeve 1403 and the moving column 1405 can move relative to each other. The fourth spring 1404, the moving column 1405 and the rubber ball 1407 are used together to press and fix the optical disc. This is suitable for gripping single or multiple optical discs. When the lower ends of the three permanent magnet claw arms 8 are fully open, the locking lever 1410 is inserted into the corresponding slot 1406 to lock the moving column 1405.

[0050] The working principle of this device is as follows: First, the device is installed at the required location using the mounting bracket 2 and external bolts. When the electromagnet 4 is energized, it generates magnetic poles that repel the permanent magnet claw arms 8. At this time, the magnetism of the electromagnet 4 is much stronger than the magnetism of the permanent magnet 3 guiding the iron core 5, thereby pushing the tops of the three permanent magnet claw arms 8 to move outward. The permanent magnet claw arms 8 rotate around the shaft 7, and the lower ends of the three permanent magnet claw arms 8 retract inward and hide in the groove 9 (see reference). Figure 1 , Figure 2 and Figure 4 When the current is disconnected, electromagnet 4 fails, and permanent magnet 3 conducts magnetism to iron core 5, generating an attractive force that draws the tops of the three permanent magnet claw arms 8 toward the central axis, while the lower ends of the three permanent magnet claw arms 8 open outwards. This is the normal posture (see reference). Figure 3 and Figure 5 When gripping a CD, the three permanent magnet claw arms 8, which are in their normal position, change to a retracted position when the electromagnet 4 is energized (see reference). Figure 1 , Figure 2 and Figure 4 The lower parts of the three permanent magnet claw arms 8 smoothly insert into the center hole of the optical disc; when the mechanism is lifted, the electromagnet 4 is de-energized, and the three permanent magnet claw arms 8 change to their normal posture to complete the gripping of the optical disc (see reference). Figure 3 and Figure 5 When the tops of the three permanent magnet claw arms 8 open outwards, the first piston 1203 moves upwards under the pulling action of the connecting rope 1204, the second piston 1207 and the movable block 1208 automatically spring up, and the sleeve 1403 and the moving column 1405 can move relative to each other. After the bottom of the three permanent magnet claw arms 8 is inserted into the center hole of a single or multiple optical discs, the tops of the three permanent magnet claw arms 8 converge inwards, the first piston 1203 automatically springs down, and the third piston 1402 and the moving column 1405 move downwards. With the cooperation of the fourth spring 1404, the moving column 1405 and the rubber ball 1407, a single or multiple optical discs can be pressed and fixed. When the first piston 1203 moves to the bottom, it will squeeze the second piston 1207 and the movable block 1208 to move downwards, the fourth piston 1409 and the locking lever 1410 move, and the locking lever 1410 finally locks into the corresponding slot 1406, the moving column 1405 is locked, and the hook block 10 can hook and support the optical disc.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disc loading and unloading device, comprising a support cylinder (1), characterized in that: The top of the support cylinder (1) is fixed with a mounting bracket (2), the top of the inner part of the support cylinder (1) is fixed with a permanent magnet (3), the inner side of the support cylinder (1) is fixed with an electromagnet (4), the permanent magnet (3) is fixed on the top of the electromagnet (4), the center of the electromagnet (4) is fixed with an iron core (5), the bottom of the support cylinder (1) is provided with a through hole (6), a shaft (7) is fixed in the through hole (6), a permanent magnet claw arm (8) is rotatably connected to the outer side of the shaft (7), the permanent magnet claw arm (8) passes through the through hole (6) and is connected to the hook block (10); A fixing ring (11) is fixed at the bottom of the iron core (5), and a hydraulic mechanism (12) is fixed inside the bottom of the support cylinder (1). The hydraulic mechanism (12) passes through the fixing ring (11) and is connected to the permanent magnet claw arm (8). A pressing fixing mechanism (14) is fixed at the bottom of the support cylinder (1). The pressing fixing mechanism (14) is connected to the hydraulic mechanism (12) through the first connecting pipe (13).

2. The optical disc loading and unloading device according to claim 1, characterized in that: The permanent magnet claw arm (8) is provided in three parts, and the three permanent magnet claw arms (8) are evenly distributed on the support cylinder (1) in the circumference. The support cylinder (1) has three grooves (9) on its outer side, and the permanent magnet claw arm (8) is located in the groove (9).

3. The optical disc loading and unloading device according to claim 1, characterized in that: The hydraulic mechanism (12) includes a first cylinder (1201), which is fixed inside the bottom of the support cylinder (1). There are three first cylinders (1201), and a first piston (1203) is slidably connected inside each first cylinder (1201). The first piston (1203) is connected to the inner top of the first cylinder (1201) through a first spring (1202).

4. The optical disc loading and unloading device according to claim 3, characterized in that: A connecting rope (1204) is fixed to the top of the first piston (1203), and the connecting rope (1204) passes through the top of the first oil cylinder (1201). The connecting rope (1204) passes through the fixing ring (11) and is connected to the permanent magnet claw arm (8).

5. The optical disc loading and unloading device according to claim 3, characterized in that: A second cylinder (1205) is fixed to the bottom of the first cylinder (1201), and a second piston (1207) is slidably connected inside the second cylinder (1205). The second piston (1207) is connected to the inner bottom of the second cylinder (1205) through a second spring (1206). A movable block (1208) is fixed to the top of the second piston (1207), and the movable block (1208) passes through the top of the second cylinder (1205) and the bottom of the first cylinder (1201).

6. The optical disc loading and unloading device according to claim 5, characterized in that: The pressing and fixing mechanism (14) includes a third cylinder (1401), which is fixed to the bottom of the support cylinder (1) and connected to the first cylinder (1201) through a first connecting pipe (13). Three third cylinders (1401) are provided, and a third piston (1402) is slidably connected inside each third cylinder (1401). The bottom of the third piston (1402)... A sleeve (1403) is fixed and penetrates the bottom of the third oil cylinder (1401). A movable column (1405) is slidably connected inside the sleeve (1403), and the movable column (1405) is connected to the inner top of the sleeve (1403) through a fourth spring (1404). The movable column (1405) and the sleeve (1403) form a telescopic structure, and a rubber ball (1407) is fixed at the bottom of the movable column (1405).

7. The optical disc loading and unloading device according to claim 6, characterized in that: The inner end face of the movable column (1405) is provided with a slot (1406), and the slots (1406) are evenly distributed on the movable column (1405).

8. The optical disc loading and unloading device according to claim 7, characterized in that: The sleeve (1403) is fixed with a fourth oil cylinder (1408), and the fourth oil cylinder (1408) is connected to the second oil cylinder (1205) through the second connecting pipe (15).

9. The optical disc loading and unloading device according to claim 8, characterized in that: The fourth piston (1409) is slidably connected inside the fourth cylinder (1408), and a locking rod (1410) is fixed on the outside of the fourth piston (1409). The locking rod (1410) passes through one side of the fourth cylinder (1408) and one side of the sleeve (1403).

10. A method for loading and unloading optical discs, applied to the optical disc loading and unloading device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. When the electromagnet (4) is energized, it generates magnetic poles that repel the permanent magnet claw arm (8). At this time, the magnetism of the electromagnet (4) is much stronger than the magnetism of the permanent magnet (3) that conducts magnetism to the iron core (5), thereby pushing the top of the three permanent magnet claw arms (8) to move outward. The permanent magnet claw arm (8) rotates around the shaft (7), and the lower end of the three permanent magnet claw arms (8) retracts inward. The lower part of the three permanent magnet claw arms (8) is smoothly inserted into the center hole of the optical disc. S2. When the current is disconnected, the electromagnet (4) fails, and the permanent magnet (3) conducts magnetic field to the iron core (5) to generate a force of attraction, attracting the top of the three permanent magnet claw arms (8) to move towards the central axis, and the lower ends of the three permanent magnet claw arms (8) to open outward, thereby completing the gripping of the optical disc. S3. Before the disc is fully gripped, the sleeve (1403) and the moving column (1405) can move relative to each other. The fourth spring (1404), the moving column (1405) and the rubber ball (1407) can press and fix the disc. This is suitable for gripping single or multiple discs. When the lower ends of the three permanent magnet claw arms (8) are fully open, the locking lever (1410) is locked into the corresponding slot (1406) to lock the moving column (1405).

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