Automatic medicine bottle sorting device

Abstract

An automatic medicine bottle sorting device, comprising a base (10), a bottle storage bin (20), an elevating mechanism (30), a conveying mechanism (40), and a gripping and positioning mechanism (50), wherein the bottle storage bin (20) is arranged on the base (10) and has a right side wall (21) and a bottom wall (22) that is inclined in a left-right direction, the right side wall (21) being provided with a window (23); the elevating mechanism (30) comprises an elevating block (31) and a lifting driving module (32), the elevating block (31) being mounted in the bottle storage bin (20) and being capable of ascending and descending under the drive of the lifting driving module (32); the conveying mechanism (40) is arranged on the base (10) and is located beside the window (23); the conveying mechanism (40) comprises a conveying belt (41), the conveying belt (41) being located below the window (23) in a vertical direction; and the gripping and positioning mechanism (50) is arranged beside the conveying mechanism (40) and comprises a bottle receiving tray (51), a centering assembly (52), and a positioning driving assembly (53), wherein the bottle receiving tray (51) is located below the conveying belt (41) in a height direction, and the centering assembly (52) is located below the bottle receiving tray (51) and can switch between a first position and a second position under the drive of the positioning driving assembly (53).

Description

Automatic vial sorting device TECHNICAL FIELD

[0001] The present application relates to the field of automated dispensing, in particular to an automatic vial sorting device. BACKGROUND

[0002] At present, the preparation of intravenous infusion drugs in hospitals is generally completed manually, which is easy to cause drug pollution and harm to patients. At the same time, in the case of a large number of ampoule liquid preparation, the dispensing efficiency is low, and it is difficult to meet the actual needs of hospitals, increasing the treatment time of patients. In addition, the process of manual preparation of liquid medicine is complicated, and the medical staff needs to contact the liquid medicine during the process, especially when preparing toxic drugs such as tumor treatment, which is easy to cause chronic harm to the dispensing personnel and lead to occupational diseases.

[0003] In view of the deficiencies of manual preparation of intravenous infusion drugs, automatic dispensing robots have appeared in the prior art to replace medical staff to prepare intravenous infusion drugs. However, the current dispensing robots are still in the semi-automatic stage and still need manual operation to add medicine. Therefore, it is expected that an automatic vial sorting device will appear to automatically sort, for example, ampoules and syringes, to cooperate with the dispensing robot to realize fully automatic dispensing.

[0004] SUMMARY

[0005] To at least partially solve the deficiencies in the prior art, the main purpose of the present application is to provide an automatic vial sorting device with high sorting efficiency.

[0006] In order to achieve the above main purpose, the present application discloses an automatic vial sorting device, comprising a base, a vial storage bin, a lifting mechanism, a conveying mechanism and a clamping and positioning mechanism;

[0007] The vial storage bin is arranged on the base and is used for storing vials; the vial storage bin has a right side wall and an inclined bottom wall in the left-right direction, and a window is arranged on the right side wall;

[0008] The lifting mechanism comprises a lifting block and a lifting drive module, the lifting block is installed in the vial storage bin and is arranged adjacent to the right side wall, and the lifting block can be lifted under the drive of the lifting drive module;

[0009] The conveying mechanism is arranged on the base in the second direction and is located beside the window; the conveying mechanism comprises a conveying belt, and the conveying belt is located below the window in the up-down direction to be able to receive the vials falling from the window;

[0010] The clamping positioning mechanism is arranged beside the conveying mechanism in a first direction perpendicular to the second direction; the clamping positioning mechanism comprises a bottle receiving disc, a centering assembly and a positioning driving assembly, the bottle receiving disc is arranged below the conveying belt in the height direction to receive the medicine bottles falling from the conveying belt; the centering assembly is arranged below the bottle receiving disc and can be switched between a first position clamping the medicine bottles falling through the through hole of the bottle receiving disc and a second position releasing the medicine bottles under the driving of the positioning driving assembly;

[0011] When the medicine bottles are sorted, the lifting block is lifted to lift the medicine bottles on the top thereof to the level of the window, the lifted medicine bottles are rolled outwards through the window to the conveying belt to be sorted; then the medicine bottles are sequentially conveyed to the bottle receiving disc and the centering assembly through the conveying belt and clamped by the centering assembly to complete the positioning.

[0012] According to an embodiment of the present application, the top wall of the lifting block is provided with a guide portion for providing a pushing force towards the window to the medicine bottles thereon in the second direction.

[0013] According to an embodiment of the present application, the guide portion is arranged in the form of an inclined plate inclined towards the window.

[0014] According to an embodiment of the present application, the conveying mechanism comprises a conveying belt, a first guard plate and a second guard plate, the first guard plate and the second guard plate are arranged on opposite sides of the conveying belt, and the first guard plate is arranged adjacent to the right side wall of the bottle storage bin; wherein the top edge of the second guard plate is arranged to exceed the top edge of the first guard plate in the up-down direction.

[0015] Further, the top edge of the second guard plate is arranged to exceed the bottom edge of the window.

[0016] According to an embodiment of the present application, the receiving disc is provided with a guide portion extending upwards to the outlet of the conveying belt; wherein the medicine bottles falling from the conveying belt fall on the guide portion and can change from a horizontal form to an inclined form, and when the medicine bottles slide into the through hole of the receiving disc from the guide portion, the medicine bottles can change from the inclined form to a vertical form.

[0017] Further, the guide portion is arranged in the form of an arc-shaped groove so that the medicine bottles falling on the guide portion have a unique movement path.

[0018] According to an embodiment of the present application, the centering assembly comprises a lower disc body, an upper disc body and a plurality of centering plates, the upper disc body, the plurality of centering plates and the lower disc body are stacked together in the up-down direction, and the upper disc body is connected to the lower disc body through the plurality of centering plates;

[0019] A first connecting column is arranged on the upper side of the centering plate, a second connecting column is arranged on the lower side of the centering plate, a connecting hole is arranged on the upper disc body, a guide slot is arranged on the lower disc body, the first connecting column is rotatably installed into the connecting hole, and the second connecting column is installed into the guide slot and can slide in the guide slot;

[0020] When the upper disc body rotates, the first connecting column rotates in the connecting hole while the second connecting column slides in the guide slot, so as to allow the centering plate to swing inwardly or outwardly to clamp or loosen the medicine bottle.

[0021] Further, a flexible pad is arranged on the inner side edge surface of the centering plate, and the flexible pad can elastically deform when clamping the medicine bottle.

[0022] Further, the positioning driving assembly comprises a driving connecting piece and a driving link, the driving connecting piece is provided with a third connecting column, the upper disc body is provided with a fourth connecting column, one end of the driving link is rotationally and movably connected to the upper disc body through the fourth connecting column, the other end of the driving link is provided with a connecting slot, the third connecting column is arranged in the connecting slot and can slide in the connecting slot; when the driving connecting piece slides forward and backward, the third connecting column slides in the connecting slot and adaptively rotates, and then the upper disc body is driven to rotate through the driving link and the fourth connecting column.

[0023] The application has the following advantages: the medicine bottle automatic sorting device is provided, the medicine bottles in the bottle storage bin are lifted in sequence by the lifting mechanism, the lifted medicine bottles roll out of the window of the bottle storage bin and fall onto the conveying belt to realize the sorting of the medicine bottles, the whole sorting process has the advantages of high sorting efficiency and strong practicability. Meanwhile, the sorted medicine bottles are conveyed to the centering assembly in the clamping and positioning mechanism by the conveying belt, the centering assembly can clamp the medicine bottles under the driving of the positioning driving assembly to realize the positioning of the medicine bottles, that is, the medicine bottles have a unique position, and then the medicine bottles can be directly matched with the dispensing robot to realize full-automatic dispensing, and the application has the advantages of high automation degree and strong adaptability.

[0024] In order to more clearly illustrate the purpose, technical scheme and advantages of the application, the application will be further described in detail below with reference to the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a first perspective view of the medicine bottle automatic sorting device according to an embodiment of the application;

[0026] Fig. 2 is a second perspective view of the medicine bottle automatic sorting device according to an embodiment of the application;

[0027] Fig. 3 is a top view of the medicine bottle automatic sorting device according to an embodiment of the application;

[0028] Fig. 4 is a perspective view of the bottle storage bin;

[0029] Fig. 5 is a structural view of the distribution block in an intermediate position;

[0030] Fig. 6 is a structural view of the distribution block in a low position;

[0031] Fig. 7 is a structural view of the distribution block in a high position;

[0032] Fig. 8 is a first perspective view of the clamping positioning mechanism;

[0033] Fig. 9 is a second perspective view of the clamping positioning mechanism;

[0034] Fig. 10 is a perspective view of the centering assembly;

[0035] Fig. 11 is an exploded view of the centering assembly;

[0036] Fig. 12 is a structural view of the centering plate. DETAILED DESCRIPTION

[0037] In the following description, many specific details are set forth in connection with the implementation in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the following implementation and description are merely intended to illustrate the present application and are not intended to limit the scope of the present application.

[0038] The automatic medicine bottle sorting device according to the implementation of the present application is shown in Figs. 1-3, which comprises a base 10, a bottle storage bin 20, a lifting mechanism 30, a conveying mechanism 40 and a clamping positioning mechanism 50; wherein the bottle storage bin 20 is installed to one side of the base 10 and is used to store medicine bottles such as ampoule bottles; specifically, the bottle storage bin 20 is preferably in a square structure, the width thereof along a first direction (front-rear direction) is preferably slightly larger than the length of the medicine bottles and is lower than the length of two medicine bottles, the length thereof along a second direction (left-right direction) exceeds the diameter of the medicine bottles, and the height thereof along the up-down direction exceeds the diameter of the medicine bottles, so that the medicine bottles can be stacked as fully and regularly as possible to more reasonably utilize the space of the bottle storage bin 20.

[0039] Further, the bottle storage bin 20 has a right side wall 21 and a bottom wall 22 which is inclined along the left-right direction, and the medicine bottles placed on the bottom wall 22 have a tendency to roll along the left-right direction towards the right side to approach the right side wall 21 to realize automatic movement of the medicine bottles in the bottle storage bin 20 to a designated position; wherein the right side wall 21 is provided with a window 23, and the medicine bottles at a height level with the window 23 can roll outwards through the window 23 to the conveying mechanism 40 located outside the window 23 to realize sorting of the medicine bottles.

[0040] In an alternative implementation, the inclination angle of the bottom wall 22 is preferably adjustable, and the adjustment can be manual adjustment or automatic adjustment according to the number of medicine bottles in the bottle storage bin 20, and the adjustment manner is not limited herein.

[0041] As shown in FIGS. 1-4, the lifting mechanism 30 is mounted to the bottle storage bin 20, which includes a lifting block 31, a lifting drive module 32 and a slide rail guide module 33; wherein the bottle storage bin 20 is provided with a sliding groove 24 near the lower end of the bottom wall 22, the lifting block 31 is placed in the sliding groove 24 and can be lifted under the drive of the lifting drive module 32, specifically, the lifting block 31 is arranged next to the right side wall 21; the slide rail guide module 33 is arranged on the mounting bracket plate 11 of the base 10, which is used to provide guidance for the lifting of the lifting block 31; for example, the number of slide rail guide modules 33 is two, which provides stable guidance for the lifting of the lifting block 31.

[0042] The lifting drive module 32 is specifically a motor lead screw module, and in other embodiments it can also be, for example, a pneumatic linear module, an electric push rod module, etc., which is not limited here and will not be expanded.

[0043] In the embodiment, the top wall 31a of the lifting block 31 is in contact with the medicine bottle, and as the lifting block 31 is raised, the medicine bottle can be lifted to be flush with the window 23, and then the medicine bottle is rolled out through the window 23 to the conveying mechanism 40; as shown in FIGS. 5-7, the lifting block 31 in the embodiment has multiple different height positions to adapt to the lifting of the medicine bottle at different height positions; the lifting control logic of the lifting block 31 can be set according to actual needs. For ease of understanding, the lifting process will be expanded below by taking an example of only one layer of medicine bottles being arranged in the height direction of the bottle storage bin 20: in the initial position, the lifting block 31 is in the middle position shown in FIG. 5, when the medicine bottle needs to be sorted, the lifting block 31 is lowered to the low position in FIG. 6, at this time the rightmost medicine bottle will roll to the top of the lifting block 31 under the action of gravity, then the lifting block 31 is raised to the high position shown in FIG. 7, at this position the medicine bottle is rolled out through the window 23 to the conveying mechanism 40; the above process is repeated in turn to realize the continuous sorting of the medicine bottles.

[0044] The top wall 31a of the lifting block 31 is preferably provided with a guide portion 31b, which is used to provide a rightward pushing force to the medicine bottle thereon in the left-right direction, so as to roll outwards when the medicine bottle is lifted to the window 23, making the rolling-out process of the medicine bottle more smooth.

[0045] As shown in FIG. 4, in the embodiment, the top wall 31a of the lifting block 31 is arranged as a inclined plate towards the window 23 to form the guide portion 31b, and the left side surface 31c of the lifting block 31 is used to block other medicine bottles, so as to more favorably ensure the sorting process of the medicine bottles. For example, the inclination of the top wall 31a of the lifting block 31 is preferably 40°-50°, specifically, for example, 45°; in another optional embodiment, the top wall 31a of the lifting block 31 can also be arranged as an arc-shaped plate towards the opening.

[0046] The conveying mechanism 40 in the embodiment can refer to the belt conveying structure in the prior art. The medicine bottle rolled out of the window 23 falls on the conveying belt 41 and is conveyed by the conveying belt 41. In order to ensure the success rate and stability of the medicine bottle falling on the conveying belt 41, the conveying mechanism 40 in the embodiment includes a first guard plate 42 and a second guard plate 43, as shown in FIG. 5. The first guard plate 42 is arranged on the left side of the conveying belt 41 next to the right side wall 21, and the second guard plate 43 is arranged on the right side of the conveying belt 41. In the vertical direction, the top edge of the second guard plate 43 is arranged to be higher than the top edge of the first guard plate 42, that is, the top edge of the second guard plate 43 is above the top edge of the first guard plate 42, thereby preventing the medicine bottle from falling out of the conveying mechanism 40 when it is rolled outwards.

[0047] As shown in FIG. 5, in the height direction, the top edge of the first guard plate 42 is preferably arranged to be flush with or slightly lower than the bottom edge of the window 23, and the top edge of the second guard plate 43 is arranged to be more than the height H1 of the bottom edge of the window 23, accounting for more than one third of the overall height H2 of the window 23.

[0048] As shown in FIGS. 8-9, the clamping and positioning mechanism 50 includes a bottle receiving disc 51, a centering assembly 52, and a positioning driving assembly 53. The bottle receiving disc 51 is used to receive the medicine bottle conveyed by the conveying mechanism 40 and is provided with a through hole 511 for the medicine bottle to pass through. In the vertical direction, the bottle receiving disc 51 is located below the conveying belt 41 to be able to directly receive the medicine bottle. The centering assembly 52 is installed on the mounting frame 12 of the base 10 and is used to clamp or release the medicine bottle falling through the through hole 511. The positioning driving assembly 53 is used to drive the centering assembly 52 to switch between the first position of clamping the medicine bottle and the second position of releasing the medicine bottle.

[0049] The bottle receiving disc 51 is provided with a guide portion 512 extending upward to the outlet of the conveying belt 41. When the medicine bottle falling from the conveying belt 41 falls on the guide portion 512, it can change from a horizontal form to an inclined form, and when it slides into the through hole 511 of the receiving disc from the guide portion 512, it can change from an inclined form to a vertical form. Preferably, the guide portion 512 is in the form of an arc-shaped groove, and the medicine bottle falling on the guide portion 512 has a nearly unique movement path and does not shake on the guide portion 512.

[0050] The centering assembly 52 is located below the bottle receiving disc 51, and the medicine bottle passing through the through hole 511 falls to the centering assembly 52 and can be clamped by the centering assembly 52. As shown in FIGS. 10-11, the centering assembly 52 includes a base 521, a lower disc body 522, an upper disc body 523, and a plurality of centering plates 524. The lower disc body 522 is fixedly installed on the base 521, and a plurality of guide grooves 5221 same in number as the centering plates 524 are arranged on the lower disc body 522 and inclined along the circumferential direction of the lower disc body 522. Specifically, the guide grooves 5221 extend outwardly relative to the radial direction of the lower disc body 522.

[0051] The upper disc body 523 is connected with the lower disc body 522 through the plurality of centering plates 524. In the embodiment, the number of the centering plates 524 is three, and in other embodiments, the number of the centering plates 524 can also be four or more, which is not limited in the embodiment and will not be described in detail. As shown in FIG. 12, the upper side of the centering plate 524 is provided with a first connecting column 5241, and the lower side of the centering plate 524 is provided with a second connecting column 5242. Correspondingly, the upper disc body 523 is provided with a connecting hole 5231, the first connecting column 5241 is installed into the connecting hole 5231, and the second connecting column 5242 is installed into the guide groove 5221 and can slide in the guide groove 5221.

[0052] Please continue to refer to FIG. 10, the upper disc body 523, the plurality of centering plates 524, and the lower disc body 522 are stacked together. During work, the upper disc body 523 is driven to rotate by the positioning driving assembly 53. Under the limiting cooperation of the guide groove 5221 and the second connecting column 5242, the first connecting column 5241 rotates in the connecting hole 5231 to allow the centering plate 524 to swing inwardly or outwardly, so as to finally realize the positioning clamping or loosening of the medicine bottle by the inner side edge surface (working surface 5244) of the plurality of centering plates 524. For example, when the upper disc body 523 rotates clockwise, the plurality of centering plates 524 swing outwardly to loosen, and when the upper disc body 523 rotates counterclockwise, the plurality of centering plates 524 swing inwardly to clamp. Preferably, a flexible pad can also be arranged at the inner side edge surface of the centering plate 524, which can elastically deform to protect the clamped medicine bottle when the medicine bottle is clamped.

[0053] Please refer to Figs. 8-9 again, the positioning driving assembly 53 comprises a positioning driving motor 531, a driving screw rod 532, a nut block 533, a driving connecting piece 534 and a driving connecting rod 535, the positioning driving motor 531 is arranged on the mounting rack 12, the driving screw rod 532 is arranged at the driving end of the positioning driving motor 531 and is driven by the positioning driving motor 531, the nut block 533 is arranged on the driving screw rod 532 and is guided by a guide rail 536, and the driving connecting piece 534 is fixedly installed on the nut block 533; wherein a third connecting column 5341 is arranged on the driving connecting piece 534, a fourth connecting column 5232 is arranged on the upper disc body 523, one end of the driving connecting rod 535 is rotationally connected with the fourth connecting column 5232, the other end of the driving connecting rod 535 is provided with a connecting groove 5351, and the third connecting column 5341 is arranged in the connecting groove 5351 and can slide in the connecting groove 5351; when the driving connecting piece 534 slides forward and backward, the third connecting column 5341 slides in the connecting groove 5351 and rotationally adapts, and then the upper disc body 523 is driven to rotate by the driving connecting rod 535 and the fourth connecting column 5232.

[0054] Further, at least one limit sensor 13 is arranged on the mounting rack 12, and the number of the limit sensors 13 is, for example, two; the limit sensor 13 is used to limit the forward and / or backward position of the driving connecting piece 534, and then the rotation angle of the upper disc body 523 is controlled by the driving connecting rod 535, so that the clamping and relaxation of the medicine bottle are finally realized. Preferably, the position of the limit sensor 13 is adjustable, so that the clamping of different types of medicine bottles can be adapted.

[0055] When working, the forward rotation of the positioning driving motor 531 drives the forward rotation of the driving screw rod 532, the nut block 533 and the driving connecting piece 534 move forward to drive the clockwise rotation of the upper disc body 523 by the driving connecting rod 535; conversely, the forward rotation of the positioning driving motor 531 drives the reverse rotation of the driving screw rod 532, the nut block 533 and the driving connecting piece 534 move backward to drive the counterclockwise rotation of the upper disc body 523 by the driving connecting rod 535.

[0056] In the embodiment, the medicine bottles in the medicine bottle storage bin 20 are sent to the conveying belt 41 after being sorted by the lifting mechanism 30, and then are conveyed to the clamping and positioning mechanism 50 to be clamped, at this time, the clamped medicine bottles are positioned and have a unique position, and then can be accurately taken away by a mechanical hand in the medicine dispensing robot / dispensing equipment to complete the automatic medicine taking.

[0057] Although the present application is described above by means of embodiments, the above embodiments are only used to illustratively describe the implementable solutions of the present application, and are not used to limit the protection scope of the present application, and any equivalent replacement or change made by those skilled in the art according to the present application should also be covered by the protection scope defined by the claims of the present application.

Claims

1. An automatic vial sorting device comprising a base; characterized in that, Further comprising: a bottle storage bin arranged on the base for storing medicine bottles; the bottle storage bin has a right side wall and a bottom wall which is inclined along the left-right direction, and the right side wall is provided with a window; a lifting mechanism including a lifting block and a lifting drive module; the lifting block is installed in the bottle storage bin and arranged close to the right side wall, and can be lifted under the drive of the lifting drive module; a conveying mechanism arranged on the base in the second direction and located beside the window; the conveying mechanism includes a conveying belt, which is located below the window in the up-down direction to receive the medicine bottles rolling out of the window; a clamping and positioning mechanism arranged beside the conveying mechanism in the first direction perpendicular to the second direction; the clamping and positioning mechanism includes a bottle receiving disc, a centering assembly and a positioning drive assembly, the bottle receiving disc is located below the conveying belt in the height direction to receive the medicine bottles falling off the conveying belt; the centering assembly is located below the bottle receiving disc and can be switched between a first position clamping the medicine bottles falling through the through hole on the bottle receiving disc and a second position releasing the medicine bottles under the drive of the positioning drive assembly; when sorting medicine bottles, the lifting block is raised to lift the medicine bottles on its top to the level of the window, the lifted medicine bottles roll out of the window to the conveying belt to be sorted; then the medicine bottles are sequentially conveyed to the bottle receiving disc and the centering assembly by the conveying belt and clamped by the centering assembly to complete positioning.

2. The vial auto-picking device of claim 1, wherein: The top wall of the lifting block is provided with a guide part for providing a pushing force to the medicine bottles on it towards the window in the second direction.

3. The vial auto-picking device of claim 1, wherein: The guide part is arranged as an inclined plate inclined towards the window.

4. The vial auto-picking apparatus of claim 1, wherein: The conveying mechanism includes a conveying belt, a first guard plate and a second guard plate, the first guard plate and the second guard plate are located on opposite sides of the conveying belt, and the first guard plate is arranged close to the right side wall of the bottle storage bin; wherein the top edge of the second guard plate is arranged to exceed the top edge of the first guard plate in the up-down direction.

5. The vial auto-sorting device of claim 4, wherein: The top edge of the second guard plate is arranged to exceed the bottom edge of the window.

6. The vial auto-picking apparatus of claim 1, wherein: The receiving disc is provided with a guide part which extends upwards to the outlet of the conveying belt; wherein the medicine bottles falling off the conveying belt fall on the guide part and can change from a horizontal form to an inclined form, and when sliding into the through hole of the receiving disc from the guide part, the medicine bottles can change from an inclined form to a vertical form.

7. The vial auto-picking apparatus of claim 6, wherein: The guide part is arranged as an arc-shaped groove so that the medicine bottles falling on the guide part have a unique movement path.

8. The vial auto-picking apparatus of claim 1, wherein: The centering assembly includes a lower disc body, an upper disc body and a plurality of centering plates, the upper disc body, the plurality of centering plates and the lower disc body are stacked together in the up-down direction, and the upper disc body is connected with the lower disc body through the plurality of centering plates; the upper side of the centering plate is provided with a first connecting column, the lower side of the centering plate is provided with a second connecting column, the upper disc body is provided with a connecting hole, the lower disc body is provided with a guide groove, the first connecting column is rotatably installed in the connecting hole, and the second connecting column is installed in the guide groove and can slide in the guide groove; When the upper disc rotates, the first connecting column rotates in the connecting hole while the second connecting column slides in the guide slot, so as to allow the centring plate to swing inwards or outwards Clamp or loosen the medicine bottle.

9. The vial auto-picking apparatus of claim 8, wherein: The inner side edge surface of the centring plate is provided with a flexible pad which can be elastically deformed when clamping the medicine bottle.

10. The vial auto-picking apparatus of claim 8, wherein: The positioning driving assembly comprises a driving connecting piece and a driving link, the driving connecting piece is provided with a third connecting column, the upper disc is provided with a fourth connecting column, one end of the driving link is rotationally and movably connected with the upper disc through the fourth connecting column, the other end of the driving link is provided with a connecting slot, the third connecting column is arranged in the connecting slot and can slide in the connecting slot; when the driving connecting piece slides forward and backward, the third connecting column slides in the connecting slot and adaptively rotates, so as to drive the upper disc to rotate through the driving link and the fourth connecting column.

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