Storage rack with cloth information tracking and intelligent classification functions

Abstract

The invention discloses a storage rack with cloth information tracking and intelligent classification functions, and belongs to the technical field of cloth storage racks, the storage rack comprises a storage rack body, the storage rack body is provided with multiple layers of storage layer plates up and down, each storage layer plate except the top is provided with a plurality of placement grooves, and a cloth roller for winding cloth is placed in each placement groove; by arranging the jacking blocks, the abutting groove, the bottom rotating rod, the motor and other components, after the cloth roller is locked by a system, the motor drives the bottom rotating rod to rotate, so that the jacking blocks at the corresponding positions rotate to pass through the abutting groove, the locked cloth roller in the containing groove is obliquely jacked up, and the cloth roller is more striking; according to the cloth taking device, an operator can visually observe the target cloth roller of the corresponding layer, so that accurate taking is achieved, the problems that in a traditional mode, time and labor are consumed in searching, and cloth is prone to being disordered and damaged are effectively solved, and the cloth taking efficiency and management orderliness are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cloth storage racks, and in particular relates to a storage rack with cloth information tracking and intelligent classification. Background Art

[0002] In modern textile and garment processing industries, the management and use of fabrics is an important and complex task. With the expansion of production scale and the increase in the variety of fabrics, how to efficiently store and use fabrics has become an urgent problem to be solved.

[0003] The traditional way of storing fabrics is to place the fabric rolls wrapped with fabrics directly on the storage rack. In actual use, when a specific fabric roll needs to be taken, even if the layer where the fabric roll is located is locked, the operator often needs to search and rummage through the numerous fabric rolls on the corresponding layer one by one, which not only consumes a lot of time and manpower, but also easily causes confusion and damage to the fabric, greatly affecting production efficiency.

[0004] In order to avoid the above technical problems, it is necessary to provide a storage rack with fabric information tracking and intelligent classification, so as to overcome the defects of the prior art in realizing accurate tracking and intelligent classification of fabric information and improving the efficiency and accuracy of fabric management. Summary of the invention

[0005] The object of the present invention is to provide a storage rack with cloth information tracking and intelligent classification to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a storage rack with cloth information tracking and intelligent classification, comprising a storage rack, wherein the storage rack is provided with multiple storage layers, each of which, except for the top storage layer, is provided with multiple placement slots, and a cloth roller for winding cloth is placed in each placement slot; Each of the placement grooves is provided with a resistance groove, and two bottom blocks are fixedly provided on the lower surface of each of the storage layers except the top, and bottom rotating rods are provided on the adjacent sides of the two bottom blocks for common rotation; The bottom rotating rod is provided with a plurality of lifting blocks at different positions and angles. When rotating, the plurality of lifting blocks can pass through the interference groove and obliquely lift the cloth roller in the corresponding placement groove. The surface of each lifting block is provided with an arc-shaped groove that can better fit the cloth roller. Each bottom rotating rod is provided with a first motor that can drive the bottom block to rotate at the rotation position of the bottom block on one side.

[0007] As a preferred embodiment, an RFID reader is fixedly arranged at an angle on each of the storage shelves through a connecting block, and an RFID tag that can be identified by the RFID reader is arranged on the surface of each of the cloth rollers. When the cloth roller is obliquely lifted up by the lifting block, its corresponding RFID tag can be identified by the obliquely arranged RFID reader.

[0008] As a preferred embodiment, the lower surface of each of the storage shelves except the bottom is provided with a synchronous limiting mechanism corresponding to the number of placement slots.

[0009] As a preferred implementation scheme, the synchronous limiting mechanism includes a multi-stage arc-shaped telescopic rod, and the top of the multi-stage arc-shaped telescopic rod is fixedly installed on the lower surface of the corresponding storage layer board.

[0010] As a preferred embodiment, the bottom end of the multi-stage arc-shaped telescopic rod is rotatably connected to a connecting frame, and the bottom of the connecting frame is rotatably connected to a top limiting block. The connection rotation direction of the multi-stage arc-shaped telescopic rod and the connecting frame is perpendicular to the connection rotation direction of the connecting frame and the top limiting block. When the cloth roller is tilted upward, the multi-stage arc-shaped telescopic rod will be adaptively extended and retracted, and the top limiting block on the surface of the cloth roller will also be synchronously lifted up.

[0011] As a preferred embodiment, the rotation points of the connecting frame and the top limiting block are provided with torsion springs for limiting the natural rotation of the top limiting block to both sides, so as to ensure that the top limiting block will not easily fall off the surface of the cloth roller when being lifted up.

[0012] As a preferred embodiment, the top limiting block is in an arc shape as a whole that fits with the surface of the cloth roller, and the lower surface of the top limiting block is provided with a friction groove that increases the friction force with the cloth roller.

[0013] As a preferred implementation, one end of the multi-stage arc-shaped telescopic rod is fixedly connected to an arc-shaped rack, and the arc-shaped rack is consistent with the arc center of the multi-stage arc-shaped telescopic rod.

[0014] As a preferred embodiment, a driving frame is fixedly provided on the lower surface of the plurality of storage shelves, a rod gear is rotatably provided on each driving frame, and a second motor for driving the rod gear to rotate is installed on one side of each driving frame.

[0015] As a preferred implementation scheme, each of the rod gears is meshed with a plurality of arc-shaped racks of a corresponding layer. When the second motor is in the off state, the extension and retraction of the multi-stage arc-shaped telescopic rod will drive the natural rotation of the rod gears through the plurality of arc-shaped racks.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides components such as a lifting block, an abutment groove, a bottom rotating rod and a first motor. When the cloth roller is locked by the system, the first motor drives the bottom rotating rod to rotate, so that the lifting block at the corresponding position rotates through the abutment groove, and the locked cloth roller in the placement groove is lifted up obliquely to make it more eye-catching. The operator can intuitively observe the target cloth roller of the corresponding layer, so as to achieve accurate picking, which effectively solves the problem of time-consuming and labor-intensive searching and easy chaos and damage of cloth in the traditional method, and significantly improves the efficiency of cloth retrieval and the orderliness of management.

[0017] The present invention realizes automatic and accurate identification of the cloth roller through the coordinated design of the lifting block, the RFID reader and the RFID tag. When the system needs to identify a certain cloth roller, the lifting block rotates to lift it obliquely. At this time, the RFID tag on the surface of the cloth roller is just in a position that can be identified by the obliquely set RFID reader. Multiple lifting blocks cooperate to automatically identify all cloth roller tags one by one without manual verification, thereby improving identification efficiency and accuracy, providing strong support for intelligent management, effectively avoiding the misidentification and missed identification that may occur in manual operation, and providing reliable support for the intelligent management of cloth.

[0018] When the cloth roller is obliquely lifted up by the lifting block, the multi-stage arc-shaped telescopic rod is synchronously and adaptively extended and retracted, so that the top limiting block is always in contact with the cloth roller. At this time, the top limiting block cooperates with the lifting block up and down, which greatly enhances the stability of the cloth roller when it is identified and lifted up. When the cloth roller needs to be taken out from the front, the operator overcomes the elastic limitation of the torsion spring and allows the top limiting block to rotate to one side, so that it can be taken out smoothly. During this period, the connecting frame is adaptively rotated at the multi-stage arc-shaped telescopic rod, and the connecting frame is rotatably connected with the multi-stage arc-shaped telescopic rod and the top limiting block, so that the cloth roller can be taken out flexibly and conveniently. In addition, in the normal lifting state, the elasticity of the torsion spring and the friction of the friction groove work together to prevent the top limiting block from easily rotating to both sides, thereby ensuring its stability supported on the top of the cloth roller.

[0019] When the cloth roller needs to be placed on the storage layer plate, the second motor is started. The second motor serves as a power source and begins to drive the rod-type gear to rotate. Since each rod-type gear is tightly meshed with the multiple arc-shaped racks on the corresponding layer, the rotation of the rod-type gear will accurately drive the multiple arc-shaped racks to move, and the arc-shaped racks are fixedly connected to the multi-stage arc-shaped telescopic rods, which makes the multi-stage arc-shaped telescopic rods on each layer adaptively telescopic. As the multi-stage arc-shaped telescopic rods are extended and retracted, the top limiting block connected to the bottom end thereof will also move upward synchronously. In this way, the top limiting block that may have hindered the placement of the cloth roller is moved away, making sufficient space for the placement of the cloth roller, realizing the function of conveniently placing the cloth roller, and greatly improving the efficiency and convenience of the cloth storage operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the rear-view stereoscopic structure of the present invention; Figure 3 It is a schematic diagram of a local three-dimensional structure of the present invention; Figure 4 It is a schematic diagram of a partial upward-looking three-dimensional structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the storage layer board of the present invention when viewed from above; Figure 6 It is a schematic diagram of a three-dimensional structure of a storage layer plate in a top view of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the lifting block of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the synchronous limiting mechanism of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the multi-stage arc telescopic rod of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the top limiting block of the present invention; Fig.11 For the present invention Figure 8 Schematic diagram of the enlarged three-dimensional structure at A in the middle.

[0021] In the figure: 1. Storage rack; 2. Storage layer; 3. Placement groove; 4. Fabric roller; 5. Resistance groove; 6. Bottom block; 7. Bottom rotating rod; 8. Lifting block; 9. Arc groove; 10. First motor; 11. Connecting block; 12. RFID reader; 13. RFID tag; 14. Synchronous limiting mechanism; 141. Multi-stage arc telescopic rod; 142. Connecting frame; 143. Top limiting block; 144. Torsion spring; 145. Friction groove; 146. Arc rack; 15. Driving frame; 16. Rod gear; 17. Second motor. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] The following examples are used to illustrate the present invention, but they cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions. Simple improvements to the method of the present invention under the premise of the concept of the present invention belong to the scope of protection claimed in the present invention.

[0024] See also Figure 1-11 The present invention provides a storage rack with cloth information tracking and intelligent classification, including a storage rack 1, wherein the storage rack 1 is provided with multiple storage layers 2, except for the top storage layer 2, each storage layer 2 is provided with a plurality of placement slots 3, and each placement slot 3 is provided with a cloth roller 4 for winding cloth;

[0025] Each placement slot 3 is provided with a resistance slot 5, and two bottom blocks 6 are fixedly provided on the lower surface of each storage layer plate 2 except the top, and bottom rotating rods 7 are provided on the adjacent sides of the two bottom blocks 6 for common rotation; A plurality of lifting blocks 8 at different positions and angles are provided on the bottom rotating rod 7. When rotating, the plurality of lifting blocks 8 can pass through the interference groove 5 and obliquely lift the cloth roller 4 in the corresponding placement groove 3. The surface of each lifting block 8 is provided with an arc-shaped groove 9 that can better fit the cloth roller 4. Each bottom rotating rod 7 is provided with a first motor 10 that can drive it to rotate at the rotation position of the bottom block 6 on one side.

[0026] By providing components such as the lifting block 8, the abutment groove 5, the bottom rotating rod 7 and the first motor 10, when the fabric roller 4 is locked by the system, the first motor 10 drives the bottom rotating rod 7 to rotate, so that the lifting block 8 at the corresponding position rotates through the abutment groove 5, and the locked fabric roller 4 in the placement groove 3 is lifted obliquely to make it more eye-catching. The operator can intuitively observe the target fabric roller 4 of the corresponding layer, so as to achieve accurate picking, which effectively solves the problem of time-consuming and labor-intensive searching and easy chaos and damage of fabrics in the traditional method, and significantly improves the efficiency of fabric retrieval and the orderliness of management.

[0027] like Figure 7 As shown, an RFID reader / writer 12 is fixedly arranged at an angle on each storage shelf 2 through a connecting block 11, and an RFID tag 13 that can be recognized by the RFID reader / writer 12 is arranged on the surface of each cloth roller 4. When the cloth roller 4 is obliquely lifted up by the lifting block 8, its corresponding RFID tag 13 can be recognized by the obliquely set RFID reader / writer 12.

[0028] Through the coordinated design of the lifting block 8, the RFID reader 12 and the RFID tag 13, automatic and accurate identification of the cloth roller 4 is achieved. When the system needs to identify a certain cloth roller 4, the lifting block 8 rotates to lift it obliquely. At this time, the RFID tag 13 on the surface of the cloth roller 4 is just in a position that can be recognized by the obliquely set RFID reader 12. Since a plurality of lifting blocks 8 at different positions and angles are provided on the bottom rotating rod 7, the cloth roller 4 in each placement slot 3 can be lifted up separately in turn, so that the RFID reader 12 can automatically identify the RFID tag 13 corresponding to each cloth roller 4 one by one, without the need for manual search and verification one by one, which greatly improves the efficiency and accuracy of cloth information recognition, effectively avoids the possible misrecognition and omission of recognition caused by manual operation, and provides reliable support for the intelligent management of cloth.

[0029] like Figure 1 As shown, the lower surface of each storage layer plate 2 except the bottom is provided with a synchronous limiting mechanism 14 corresponding to the number of the placement slots 3.

[0030] like Figure 8As shown, the synchronous limiting mechanism 14 includes a multi-stage arc-shaped telescopic rod 141 , and the top of the multi-stage arc-shaped telescopic rod 141 is fixedly installed on the lower surface of the corresponding storage layer board 2 .

[0031] like Figure 8 As shown, the bottom end of the multi-stage arc-shaped telescopic rod 141 is rotatably connected to the connecting frame 142, and the bottom of the connecting frame 142 is rotatably connected to the top limiting block 143. The connection rotation direction of the multi-stage arc-shaped telescopic rod 141 and the connecting frame 142 is perpendicular to the connection rotation direction of the connecting frame 142 and the top limiting block 143. When the cloth roller 4 is tilted, the multi-stage arc-shaped telescopic rod 141 will be adapted to extend and retract, and the top limiting block 143 on the surface of the cloth roller 4 will also be synchronously lifted.

[0032] like Fig. 9 As shown, the rotation point of the connecting frame 142 and the top limiting block 143 is provided with a torsion spring 144 for limiting the natural rotation of the top limiting block 143 to both sides, so as to ensure that the top limiting block 143 will not easily fall off the surface of the cloth roller 4 when being lifted up.

[0033] like Fig. 9 and Fig.10 As shown, the top limiting block 143 is in an arc shape as a whole that fits with the surface of the cloth roller 4 , and the lower surface of the top limiting block 143 is provided with a friction groove 145 that increases the friction force with the cloth roller 4 .

[0034] like Fig. 9 and Fig.10 As shown, one end of the multi-stage arc-shaped telescopic rod 141 is fixedly connected to an arc-shaped rack 146 , and the arc-shaped rack 146 is consistent with the arc center of the multi-stage arc-shaped telescopic rod 141 .

[0035] When the cloth roller 4 is obliquely lifted up by the lifting block 8, the multi-stage arc-shaped telescopic rod 141 will be adaptively extended and retracted to ensure that the top limiting block 143 is always tightly fitted on the cloth roller 4. In this way, when the cloth roller 4 is partially lifted up obliquely, the top limiting block 143 can form an upper and lower support for the cloth roller 4 together with the lifting block 8, which greatly improves the stability of the cloth roller 4 when it is identified and lifted up. When it is necessary to take out the cloth roller 4 from the front, the operator can overcome the elastic limitation of the torsion spring 144 and make the top limiting block 143 rotate to one side, thereby smoothly taking out the cloth roller 4. In this process, the connecting frame 142 will be moved at the multi-stage arc-shaped telescopic rod 141. The two rotating connection parts, the connecting frame 142 and the multi-stage arc-shaped telescopic rod 141 and the connecting frame 142 and the top limiting block 143, realize the flexibility and convenience when taking out the cloth roller 4. In addition, under normal circumstances, when the top limiting block 143 is lifted up, due to the elastic limitation of the torsion spring 144 and the friction of the friction groove 145 at the bottom of the top limiting block 143, the top limiting block 143 will not easily rotate to both sides in a natural state, thereby ensuring its stability in supporting the top of the cloth roller 4. In summary, the stability and flexibility of the cloth roller 4 when being identified and taken out are realized as a whole, and the efficiency and convenience of cloth management are effectively improved.

[0036] like Figure 8 As shown, a driving frame 15 is fixedly provided on the lower surface of the plurality of storage shelves 2 , a rod gear 16 is rotatably provided on each driving frame 15 , and a second motor 17 for driving the rod gear 16 to rotate is installed on one side of each driving frame 15 .

[0037] like Figure 8 As shown, each rod gear 16 is meshed with a plurality of arc-shaped racks 146 of a corresponding layer. When the second motor 17 is turned off, the extension and retraction of the multi-stage arc-shaped telescopic rod 141 will drive the rod gear 16 to rotate naturally through the plurality of arc-shaped racks 146 .

[0038] When it is necessary to place the cloth roller 4 on the storage layer plate 2, the second motor 17 is started. The second motor 17 serves as a power source and starts to drive the rod gear 16 to rotate. Since each rod gear 16 is tightly meshed with the multiple arc-shaped racks 146 of the corresponding layer, the rotation of the rod gear 16 will accurately drive the multiple arc-shaped racks 146 to move, and the arc-shaped racks 146 are fixedly connected to the multi-stage arc-shaped telescopic rods 141, which makes the multi-stage arc-shaped telescopic rods 141 of each layer adaptively telescopic. As the multi-stage arc-shaped telescopic rods 141 are extended and retracted, the top limiting block 143 connected to its bottom end will also move up synchronously. In this way, the top limiting block 143 that may have hindered the placement of the cloth roller 4 is moved away, making sufficient space for the placement of the cloth roller 4, realizing the function of convenient placement of the cloth roller 4, and greatly improving the efficiency and convenience of the cloth storage operation.

[0039] The working principle and use process of the present invention are as follows: when a certain cloth roller 4 needs to be identified, the first motor 10 is started, and the first motor 10 drives the bottom rotating rod 7 to rotate, so that the lifting block 8 at the corresponding position passes through the abutment groove 5, and the cloth roller 4 is lifted obliquely. At this time, the RFID tag 13 on the surface of the cloth roller 4 is just in a position that can be identified by the obliquely arranged RFID reader 12, thereby realizing automatic and accurate identification without manual verification, thereby improving the identification efficiency and accuracy; When it is necessary to take out the cloth roller 4, the first motor 10 also drives the bottom rotating rod 7 to rotate, and the lifting block 8 lifts the cloth roller 4 obliquely to make it more eye-catching. The operator can intuitively observe the target cloth roller 4 and achieve accurate picking. In the lifting process, the multi-stage arc telescopic rod 141 will be adaptively extended to ensure that the top limit block 143 is always tightly fitted on the cloth roller 4, and together with the lifting block 8, it forms an upper and lower support for the cloth roller 4, thereby improving the stability of the cloth roller 4 when being lifted. At the same time, since the connecting frame 142 is connected to the multi-stage arc telescopic rod 141 and the connecting frame 142 is connected to the top limit block 143 for rotation, and the connecting frame 142 and the top limit block 143 are provided with a torsion spring 144 at the rotation point, when taking out the cloth roller 4, the operator can overcome the elastic limit of the torsion spring 144 and rotate the top limit block 143 to achieve flexible removal. In general, the top limit block 143 will not easily fall off the surface of the cloth roller 4, thereby ensuring the stability of the support. When the cloth roller 4 needs to be placed, the second motor 17 is started, and the second motor 17 drives the rod gear 16 to rotate. Since the rod gear 16 is engaged with the arc rack 146, the arc rack 146 is driven to move, and then the multi-stage arc telescopic rod 141 is extended and retracted, driving the top limiting block 143 to move upward, making room for the placement of the cloth roller 4, thereby realizing the function of convenient placement.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A storage rack with cloth information tracking and intelligent classification, comprising a storage rack (1), wherein the storage rack (1) is provided with a plurality of upper and lower storage layers (2), wherein each of the storage layers (2) except the top is provided with a plurality of placement grooves (3), and each of the placement grooves (3) is provided with a cloth roller (4) for winding cloth, characterized in that: Each of the placement grooves (3) is provided with a resistance groove (5) extending therethrough, and two bottom blocks (6) are fixedly provided on the lower surface of each of the storage layers (2) except the top, and bottom rotating rods (7) are provided on adjacent sides of the two bottom blocks (6) for rotation thereof; The bottom rotating rod (7) is provided with a plurality of lifting blocks (8) at different positions and angles. When rotating, the plurality of lifting blocks (8) can pass through the abutment groove (5) and lift the cloth roller (4) in the corresponding placement groove (3) obliquely. The surface of each lifting block (8) is provided with an arc-shaped groove (9) that can better fit the cloth roller (4). Each bottom rotating rod (7) is provided with a first motor (10) capable of driving the bottom block (6) to rotate at one side thereof.

2. The storage rack with cloth information tracking and intelligent classification according to claim 1, characterized in that: An RFID reader (12) is fixedly arranged on each of the storage layers (2) via a connection block (11) in an inclined manner, and an RFID tag (13) capable of being identified by the RFID reader (12) is arranged on the surface of each of the cloth rollers (4). When the cloth rollers (4) are obliquely lifted by the lifting block (8), the corresponding RFID tag (13) can be identified by the obliquely arranged RFID reader (12).

3. The storage rack with cloth information tracking and intelligent classification according to claim 1, characterized in that: The lower surface of each of the storage layers (2) except the bottom is provided with a synchronous limiting mechanism (14) corresponding to the number of the placement slots (3).

4. The storage rack with cloth information tracking and intelligent classification according to claim 3, characterized in that: The synchronous limiting mechanism (14) comprises a multi-stage arc-shaped telescopic rod (141), and the top of the multi-stage arc-shaped telescopic rod (141) is fixedly mounted on the lower surface of the corresponding storage layer board (2).

5. The storage rack with cloth information tracking and intelligent classification according to claim 4, characterized in that: The bottom end of the multi-stage arc-shaped telescopic rod (141) is rotatably connected to a connecting frame (142), and the bottom of the connecting frame (142) is rotatably connected to a top limiting block (143). The connection rotation direction of the multi-stage arc-shaped telescopic rod (141) and the connecting frame (142) is perpendicular to the connection rotation direction of the connecting frame (142) and the top limiting block (143). When the cloth roller (4) is tilted upward, the multi-stage arc-shaped telescopic rod (141) will be adapted to be extended and retracted, and the top limiting block (143) on the surface of the cloth roller (4) will also be synchronously lifted.

6. The storage rack with cloth information tracking and intelligent classification according to claim 5, characterized in that: The rotation points of the connecting frame (142) and the top limiting block (143) are provided with torsion springs (144) for limiting the natural rotation of the top limiting block (143) to both sides, thereby ensuring that the top limiting block (143) will not easily fall off the surface of the cloth roller (4) when being lifted up.

7. The storage rack with cloth information tracking and intelligent classification according to claim 6, characterized in that: The top limiting block (143) is in an arc shape as a whole and fits with the surface of the cloth roller (4); the lower surface of the top limiting block (143) is provided with a friction groove (145) for increasing the friction force with the cloth roller (4).

8. The storage rack with cloth information tracking and intelligent classification according to claim 4, characterized in that; One end of the multi-stage arc-shaped telescopic rod (141) is fixedly connected to an arc-shaped rack (146), and the arc-shaped rack (146) and the arc center of the multi-stage arc-shaped telescopic rod (141) are consistent.

9. The storage rack with cloth information tracking and intelligent classification according to claim 8, characterized in that; A driving frame (15) is fixedly arranged on the lower surface of the plurality of storage layers (2), a rod-type gear (16) is rotatably arranged on each of the driving frames (15), and a second motor (17) for driving the rod-type gear (16) to rotate is installed on one side of each of the driving frames (15).

10. A storage rack with cloth information tracking and intelligent classification according to claim 9, characterized in that; Each of the rod-type gears (16) meshes with a plurality of arc-shaped racks (146) of a corresponding layer, and when the second motor (17) is in a turned-off state, the extension and retraction of the multi-stage arc-shaped telescopic rod (141) will drive the rod-type gears (16) to rotate naturally via the plurality of arc-shaped racks (146).

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