Laminated double-extending-position stacking machine

Abstract

The stacking machine comprises a stand column and a warehouse, the warehouse reciprocates in the length direction of the stand column, the stacking machine further comprises a plurality of forks for taking and placing goods, the forks are arranged in the vertical direction and slidably connected with the warehouse in the transverse direction, and the warehouse is provided with a translation part used for driving the forks to move. Inlets and outlets corresponding to the forks are formed in the two ends of the warehouse in the length direction; the stacking plates are located in the warehouse and slidably connected with the warehouse in the length direction of the stand column, the warehouse is provided with a lifting part used for driving all the stacking plates to move in the vertical direction, when the stacking plates move, the translation part drives the pallet forks to avoid the stacking plates, and radio frequency identification equipment is fixedly arranged at the upper ends of the stacking plates; and the metal curtain is located on the outer side of the warehouse and used for blocking the inlet and outlet, and a winding assembly used for driving the metal curtain to be wound or unwound is further arranged outside the warehouse. The stacking device has the effect of improving the working efficiency during stacking and goods taking.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of stacking equipment, in particular to a double-stretch stacking machine of the stacking type. BACKGROUND

[0002] The stacking machine is a goods handling equipment for warehouse, mainly used for transporting goods from low place to shelves, or taking designated goods from high shelves. With the demand of modern logistics management, the application of stacking machine in three-dimensional warehouse management is also more and more common.

[0003] The related technology can refer to the Chinese patent with publication number CN217349276U, which discloses a stacking machine and a stacking system, comprising a support mechanism, a taking and placing mechanism, and a walking mechanism, a walking driving mechanism and a lifting driving mechanism installed on the support mechanism. The walking driving mechanism is configured to drive the support mechanism and the walking mechanism to move along the track. The lifting driving mechanism is in transmission connection with the taking and placing mechanism to drive the taking and placing mechanism to move to the target position. The device solves the technical problem of how to automatically place goods in the corresponding compartment or take goods from the corresponding compartment in the related technology.

[0004] For the related technology in the above, in a large three-dimensional warehouse, the shelves for storing goods are usually arranged in multiple layers vertically. When placing goods, the stacking machine in the above needs to first lift the goods to the height of the corresponding storage compartment of the shelf by the lifting driving mechanism, and then push the goods into the storage compartment by the taking and placing mechanism of the stacking machine. In order to prevent goods from being squeezed, only one layer of goods is usually stored in the same layer of storage compartment. Therefore, when a batch of goods needs to be stacked in storage compartments with different heights, the taking and placing mechanism needs to be operated to move vertically back and forth, which consumes additional time during the movement, resulting in low efficiency of stacking and taking goods. SUMMARY

[0005] In order to improve the work efficiency during stacking and taking goods, the present application provides a double-stretch stacking machine of the stacking type.

[0006] The present application provides a double-stretch stacking machine of the stacking type, which adopts the following technical scheme: The application discloses a double-stretching-position stacking machine of a laminated type, which comprises vertical columns and warehouses, and the warehouses are reciprocally movable along the length direction of the vertical columns, and is characterized in that: a plurality of pairs of oppositely arranged forks are further arranged, the forks of different groups are arranged along the vertical direction of the warehouses, the two forks of the same group are located in the same horizontal plane and are parallel to each other, the forks are slidably connected to the warehouses along the transverse direction, the warehouses are provided with translation members for driving the forks to move, and the warehouses are provided with import and export ports corresponding to the forks at both ends along the length direction; a plurality of stacking plates are arranged in the warehouses and are slidably connected to the warehouses along the length direction of the vertical columns, the stacking plates are parallel to each other, one stacking plate corresponds to one group of forks, the warehouses are provided with lifting members for driving the stacking plates to move along the vertical direction, when the stacking plates move, the translation members drive the forks to avoid the stacking plates, and the stacking plates are provided with radio frequency identification devices for identifying goods; and metal curtains are arranged outside the warehouses and are used for plugging the import and export ports, and the warehouses are further provided with winding assemblies corresponding to the import and export ports one by one, and the winding assemblies are used for driving the metal curtains to wind or unwind.

[0007] By adopting the above technical scheme, in the initial state, the winding assemblies drive the metal curtains to wind, the warehouses are in communication with the outside world through the import and export ports, at this time, all the stacking plates are located at the upper end or the lower end of the warehouses, and at least one stacking plate corresponds to the forks, when the goods are taken, the forks convey the goods from the import and export ports to the corresponding stacking plates, after the forks complete the work, the translation members drive the forks to move transversely, so that the forks avoid the stacking plates. The lifting members drive the stacking plates on which the goods are placed to move upwards, and another group of stacking plates is moved to the positions of the corresponding forks to take the goods again. After the goods are taken, the winding assemblies unwind the metal curtains, so that the metal curtains plug the import and export ports, at this time, the radio frequency identification devices scan and identify the goods. When the goods are placed, the stacking plates carrying the goods correspond to the corresponding forks, so that all the goods can be placed and stacked at the same time, when the goods are conveyed, a plurality of different goods can be conveyed at the same time, and then the working efficiency during the stacking and taking of the goods is improved.

[0008] Optionally, the forks comprise a side plate, a goods conveying plate, a moving plate one and a moving plate two, the side plate is slidably connected to the warehouse along the transverse direction, the warehouse is provided with a containing portion corresponding to the side plate, the goods conveying plate is located on the side of the side plate close to the stacking plate, the moving plate two is located on the side of the side plate close to the goods conveying plate and is slidably connected to the side plate along the length direction of the side plate, the moving plate two is located between the moving plate one and the goods conveying plate and is slidably connected to the moving plate one and the goods conveying plate, and connecting members are arranged between the moving plate one and the moving plate two and between the moving plate two and the goods conveying plate, the side plate is provided with a power member for driving the moving plate one to move, and when the moving plate one moves, the moving plate two and the goods conveying plate are driven to move in stages through the connecting members.

[0009] By adopting the technical scheme, the accommodating portion provides a avoiding space for the forks, when the stacking plate moves, the forks are located in the accommodating portion, the side plate drives the moving plate one and the moving plate two to move when moving, and then the goods carrying plate translates along the transverse direction, so that the goods carrying plate is close to or away from the goods. When the power member drives the moving plate one to move, the moving plate one drives the moving plate two and the goods carrying plate to extend in sequence through the connecting member, and then the goods are picked up and placed.

[0010] Optionally, the connecting member includes two sprockets, a chain, a connecting block one and a connecting block two. For the connecting member between the moving plate one and the moving plate two, the two sprockets are located at the two ends of the moving plate one along the length direction and are rotationally connected with the moving plate one, the chain is engagedly connected between the two sprockets, and the connecting block one and the connecting block two are fixedly connected to the outer side of the chain. The connecting block one is fixedly connected with the side plate, and the connecting block two is fixedly connected with the moving plate two.

[0011] By adopting the technical scheme, when the moving plate one moves, the two sprockets move, the chain is driven to rotate by the connecting block one of the side plate, the moving plate two is driven to move by the connecting block two when the chain rotates, and then the moving plate one moves while driving the moving plate two to move synchronously. The movement of the moving plate two does not require an additional driving mechanism, which is conducive to reducing the weight of the moving plate two and simplifying the structure.

[0012] Optionally, the side of the goods carrying plate away from the corresponding side plate is provided with a plurality of push rods arranged along the length direction of the goods carrying plate. The goods carrying plate is fixedly provided with a rotary motor corresponding to the push rods one by one. The rotary motor is used to drive the push rods to rotate along the transverse direction. A torsional spring is arranged between the push rod and the output shaft of the rotary motor, and the torsional spring is used to limit the push rod, so that the output shaft of the rotary motor drives the push rod to rotate when rotating.

[0013] By adopting the technical scheme, in the initial state, the push rod is in a vertical upward state. When the goods carrying plate moves to the side edge position of the goods, the goods are located between any two push rods. The rotary motor drives the push rod to rotate to a horizontal state. At this time, the push rod moves to the two sides of the goods, and the goods carrying plate moves the goods through the push rod when moving. The torsional spring provides a space between the push rod and the output shaft of the rotary motor. When the push rod is miscontacted with the goods during rotation, the push rod and the output shaft of the rotary motor move relatively, thereby reducing the probability of the push rod pressing the goods.

[0014] Optionally, the side of the side plate close to the stacking plate is opened along the length direction to form a positioning groove. The side edge of the stacking plate along the width direction is fixedly connected with an extension edge matched with the positioning groove. The extension edge contacts the inner wall of the positioning groove after entering the positioning groove. A plurality of positioning blocks are arranged in the positioning groove in an extension manner. The side plate is provided with an elastic member one corresponding to the positioning block. The extension edge is located between all the positioning blocks after entering the positioning groove, and the elastic member one pushes the positioning block to abut against the extension edge.

[0015] By adopting the above technical scheme, when the goods are placed on the stacking plate, the stacking plate is moved to the corresponding fork by the lifting piece, at this time, the side plate is brought close to the stacking plate by the translation piece, so that the extension edge of the stacking plate enters the positioning groove, at this time, the positioning block is attached to the extension edge under the action of the elastic piece one, and the side plate supports the stacking plate through the extension edge, which is beneficial to improve the working stability of the stacking plate.

[0016] Optionally, the cross beam is fixed at both ends of the length direction of the warehouse, the cross beam is located in the entrance and exit, the side of the cross beam close to the stacking plate is provided with a movable slot in the length direction, and a supporting plate is arranged in the movable slot and rotationally connected with the cross beam in the vertical direction, and the cross beam is provided with a rotating piece for driving the supporting plate to rotate, when the side plate is close to the cross beam, the rotating piece drives the supporting plate to extend out of the movable slot, and at this time, the supporting plate is located below the stacking plate and attached to the lower end surface of the stacking plate.

[0017] By adopting the above technical scheme, the cross beam supports the supporting plate, in the initial state, when the stacking plate moves to the position of the corresponding fork, the rotating piece drives the supporting plate to rotate, so that the lower end of the supporting plate moves out of the movable slot and contacts the lower end surface of the stacking plate, thereby supporting the stacking plate, further improving the working stability of the stacking plate, and at the same time, the gap between the stacking plate and the cross beam is shielded, reducing the probability of the radio frequency identification equipment between different layers of stacking plates being scanned.

[0018] Optionally, the rotating piece comprises a moving plate and a guide block, the moving plate is slidably connected with the warehouse in the length direction of the cross beam, and the cross beam and the moving plate are provided with an elastic piece two, in the natural state, the elastic piece two pushes the moving plate away from the stacking plate, the supporting plate is fixed at both ends in the length direction and provided with a rotating column, the rotating column is arranged in the sliding direction of the moving plate, the rotating column is rotationally connected with the cross beam in the vertical direction, the outer circle of the rotating column is provided with a spiral guide groove in the circumferential direction, the guide block is located in the guide groove and slidably connected with the rotating column in the guide groove, and the moving plate is fixedly connected with the guide block.

[0019] By adopting the above technical scheme, in the initial state, the moving plate is away from the stacking plate under the action of the elastic piece two, at this time, the side plate is located away from the stacking plate, and the supporting plate is located in the movable slot and in the vertical state. When the stacking plate moves to the appropriate position, the side plate is close to the stacking plate under the action of the translation piece, the side plate contacts the moving plate and pushes the moving plate to move, the moving plate drives the guide block to move when moving, under the action of the guide groove, the guide block drives the rotating column to rotate, so that the rotating column drives the supporting plate to overturn, when the side plate moves to the preset position, the supporting plate is attached to the lower end surface of the stacking plate, thereby realizing the support of the supporting plate to the stacking plate.

[0020] Optionally, the winding assembly comprises a winding roller, a winding motor, a reset spring, a winding disc and a guide rope, the winding roller is arranged along the width direction of the warehouse and is rotationally connected with the warehouse, the metal curtain is arranged outside the winding roller and is fixedly connected with the winding roller, the winding motor is fixedly connected with the warehouse and is used to drive the winding roller to rotate, the winding disc is located at the side away from the winding roller of the inlet and outlet and is rotationally connected with the warehouse, the side of the metal curtain away from the winding roller is fixedly provided with a supporting roller, one end of the guide rope is fixedly connected with the supporting roller, and the other end is fixedly connected outside the winding disc, and the reset spring is located between the winding disc and the warehouse and is used to drive the winding disc to wind.

[0021] By adopting the above technical scheme, in the initial state, the reset spring is in a deformed state, thereby having the effect of driving the winding disc to wind the guide rope, when the metal curtain is unwound, the winding disc is wound, thereby guiding the supporting roller to move through the guide rope, the metal curtain is attached to the warehouse, the supporting roller drives the metal curtain to block the inlet and outlet, the sealing effect of the warehouse is improved, and the scanning accuracy of the radio frequency identification device is improved.

[0022] Optionally, the lower end of the warehouse is rotationally connected with a driving disc in the transverse direction, the warehouse is fixedly provided with a direction adjusting motor used to drive the driving disc to rotate, a plurality of polygonal holes one are formed in the upper end of the driving disc at the axis, the stacking plate is rotationally connected with a rotating disc coaxial with the driving disc, the rotating disc penetrates the stacking plate in the vertical direction, polygonal holes two coaxial with the polygonal holes one and having the same cross section are formed in the upper end of the rotating disc, the lower end of the rotating disc is fixedly connected with a plurality of polygonal rods matched with the polygonal holes one, and the polygonal rods are attached to the inner walls of the polygonal holes one when the polygonal rods are located in the polygonal holes one.

[0023] By adopting the above technical scheme, the goods on the stacking plate are located above the rotating disc, when it is necessary to adjust the direction of the goods on the lower stacking plate, the stacking plate is controlled to be close to the driving disc, the corresponding polygonal rod is inserted into the polygonal hole one, the driving disc is driven to rotate by the direction adjusting motor, the rotating disc drives the goods on the stacking plate to rotate, and the direction of the goods is adjusted; when it is necessary to adjust the direction of the goods on the upper stacking plate, the polygonal rod on the lower rotating disc is first inserted into the polygonal hole one of the driving disc, and then the polygonal rod in the upper rotating disc is inserted into the polygonal hole two of the lower rotating disc, the driving disc drives the two rotating discs to synchronously rotate when the driving disc rotates, and the direction of the goods is adjusted, the adjustment process can be completed in the warehouse, and the stacking convenience is improved.

[0024] In summary, the present application has at least one of the following beneficial technical effects: 1. In the initial state, the winding assembly drives the metal curtain to wind, and the warehouse is connected with the outside through the import and export. At this time, all the stacking plates are located at the upper end or the lower end of the warehouse, and at least one stacking plate corresponds to the fork. When taking the goods, the fork transports the goods to the corresponding stacking plate through the import and export, and after the fork completes the work, the translation member drives the fork to move horizontally to make the fork avoid the stacking plate. The stacking plate on which the goods are placed is lifted by the lifting member, and another group of stacking plates is moved to the position of the corresponding fork to take the goods again. After completing the taking of goods, the winding assembly unwinds the metal curtain to close the import and export, and at this time the radio frequency identification device scans and identifies the goods. When placing the goods, the stacking plate carrying the goods corresponds to the corresponding fork, thereby facilitating the placement and stacking of all goods at the same time. When transporting the goods, multiple different goods can be transported at the same time, thereby facilitating the improvement of the work efficiency during stacking and taking of goods; 2. The goods on the stacking plate are above the rotating disc. When the orientation of the goods on the lower stacking plate needs to be adjusted, the stacking plate is operated to be close to the driving disc, so that the corresponding multi-prong rod is inserted into the multi-prong hole one. At this time, the driving disc is driven to rotate by the orientation adjusting motor, so that the rotating disc drives the goods on the stacking plate to rotate, thereby completing the orientation adjustment of the goods. When the orientation of the goods on the upper stacking plate needs to be adjusted, first, the multi-prong rod in the lower rotating disc is inserted into the multi-prong hole one of the driving disc, and then the multi-prong rod in the upper rotating disc is inserted into the multi-prong hole two of the lower rotating disc. When the driving disc rotates, it drives the two rotating discs to rotate synchronously, thereby completing the orientation adjustment of the goods. The adjustment process can be completed in the warehouse, which is beneficial to improve the stacking convenience. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0026] Figure 2 It is a schematic diagram of the overall structure of the embodiment.

[0027] Figure 3 It is a schematic diagram of the overall structure of the embodiment.

[0028] Figure 4 It is a schematic diagram of the overall structure of the embodiment.

[0029] Figure 5 It is Figure 2 It is an enlarged schematic diagram of part A in FIG.

[0030] Figure 6 It is a schematic diagram of the overall structure of the embodiment.

[0031] Explanation of reference signs: 1, stand; 111, transmission belt; 112, conveying motor; 113, guide wheel; 12, base; 121, supporting wheel; 122, moving motor; 13, distance detection device; 2, goods bin; 21, stacking plate; 211, extension edge; 22, lifting piece; 221, lifting motor; 222, lifting screw; 23, radio frequency identification device; 24, containing part; 25, cross beam; 251, movable groove; 252, supporting plate; 253, rotating column; 254, guide groove; 26, rotating piece; 261, moving plate; 262, guide block; 263, elastic piece two; 27, rotating disc; 271, multi-edge rod; 272, multi-edge hole two; 281, translation motor; 382, translation screw; 3, goods fork; 31, side plate; 311, positioning groove; 312, positioning block; 313, elastic piece one; 314, top block; 32, goods carrying plate; 321, pushing rod; 322, rotating motor; 323, torsional spring; 33, moving plate one; 34, moving plate two; 35, connecting piece; 351, sprocket; 352, chain; 353, connecting block one; 354, connecting block two; 4, metal curtain; 41, supporting roller; 51, winding roller; 52, winding motor; 53, reset spring piece; 54, winding disc; 55, guide rope; 6, driving disc; 61, direction adjusting motor; 62, multi-edge hole one; 7, cross rail; 71, marker plate. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to all the drawings.

[0033] The embodiment of the application discloses a laminated double-stretch-position stacking machine.

[0034] Embodiment: Reference Figure 1 and Figure 2 A laminated double-stretch-position stacking machine, comprising a stand 1, the number of the stand 1 is set according to requirements, and the stand 1 can be one, two or more, and in the embodiment, one stand 1 is taken as an example for description. A base 12 is vertically and fixedly arranged at the lower end of the stand 1, the lower end of the base 12 is provided with a cross rail 7, the cross rail 7 is arranged along the horizontal direction, and the stand 1 is perpendicular to the cross rail 7.

[0035] Reference Figure 1 and Figure 2 A plurality of supporting wheels 121 are rotationally connected to the lower end of the base 12, the supporting wheels 121 are rotationally connected with the cross rail 7 along the length direction of the cross rail 7, and a moving motor 122 is installed on the base 12, and the moving motor 122 is used to drive any supporting wheel 121 to rotate. Under the connection of the base 12, any supporting wheel 121 is driven to rotate, and the stand 1 is driven to move along the length direction of the cross rail 7, so that the position of the stand 1 can be adjusted along the horizontal direction.

[0036] Reference Figure 1 and Figure 2One end of the cross rail 7 is fixedly provided with a marker plate 71, the position of the marker plate 71 is fixed, and a distance detection device 13 is installed on the base 12. The distance detection device 13 can be a laser range finder, a barcode positioning element or a servo motor, etc. In this embodiment, the laser range finder is taken as an example. The laser range finder is installed on the upper end of the base 12 and moves with the base 12. The marker plate 71 corresponds to the laser range finder. During the movement of the base 12, the laser range finder emits laser to the marker plate 71. After the reflection of the laser on the marker plate 71, the laser is received by the laser range finder again. Then, according to the time difference between the emission and the reception of the laser, the distance between the base 12 and the marker plate 71 is measured, which is beneficial to accurately control the movement distance of the stand column 1.

[0037] With reference to Figure 1 and Figure 2 , the stand column 1 is provided with a warehouse 2, the warehouse 2 moves back and forth along the length direction of the stand column 1, and the side close to the stand column 1 of the warehouse 2 is fixedly provided with a mounting plate. The side close to the stand column 1 of the mounting plate is rotatably connected with a plurality of pulleys. The stand column 1 is provided with a sliding rail along the length direction and matched with the pulleys. All the pulleys are located in the corresponding sliding rails and are in rolling connection with the sliding rails. The stand column 1 positions and guides the warehouse 2 through the cooperation of the pulleys and the sliding rails.

[0038] With reference to Figure 1 and Figure 2 , the conveying motor 112 is installed on the side of the stand column 1 away from the warehouse 2. The output shaft of the conveying motor 112 is coaxially fixed with a driving wheel. The driving wheel is in rotational connection with the stand column 1 and is located on the side of the transmission belt 111 close to the guide wheels 113. The transmission belt 111 is in rolling connection with the driving wheel. The driving wheel drives the transmission belt 111 to rotate when the driving wheel rotates. The stand column 1 is rotatably connected with a plurality of tensioning wheels. The tensioning wheels are located on the side of the transmission belt 111 away from the guide wheels 113 and are in rolling connection with the transmission belt 111. The driving wheel is located between the plurality of tensioning wheels and pushes the transmission belt 111 to be in close contact with the driving wheel, thereby improving the connection stability between the driving wheel and the transmission belt 111. A plurality of clamping blocks are uniformly fixed on the outer side of the driving wheel in the circumferential direction. The inner side of the transmission belt 111 is provided with clamping grooves matched with the clamping blocks. The clamping blocks are sequentially matched with the clamping grooves when the driving wheel rotates, thereby improving the friction between the driving wheel and the transmission belt 111. The side of the transmission belt 111 away from the guide wheels 113 is provided with a connecting part for connecting the mounting plate. When the transmission belt 111 rotates, the mounting plate and the warehouse 2 are driven to move along the stand column 1 through the connecting part.

[0039] With reference to Figure 2And Figure 3 A plurality of stacking plates 21 are connected to the warehouse 2 in the vertical direction, and the warehouse 2 is provided with an entrance and an exit at both ends along the length direction of the stacking plate 21. The number of stacking plates 21 is at least two, and two stacking plates 21 are taken as an example in the embodiment. All the stacking plates 21 are horizontally arranged, and the projections on the horizontal plane are coincident with each other. The stacking plate 21 divides the warehouse 2 into a plurality of independent cavities, and the warehouse 2 is provided with a lifting piece 22 for driving the independent movement of the stacking plate 21.

[0040] Referring to Figure 2 And Figure 3 The lifting piece 22 includes a lifting motor 221 and a lifting screw 222. In the embodiment, two groups of lifting pieces 22 correspond to the same stacking plate 21, and the two groups of lifting pieces 22 are located at both ends of the stacking plate 21 along the diagonal direction to improve the stress stability of the stacking plate 21. The lifting screw 222 is arranged in the vertical direction and is rotatably connected to the warehouse 2 about its own axis. The lifting motor 221 is installed at the lower end of the warehouse 2, and the output end of the lifting motor 221 is coaxially fixed with the lifting screw 222. The lifting motor 221 drives the lifting screw 222 to rotate when it works. The lifting screw 222 penetrates through the corresponding stacking plate 21 and is threadedly connected with the stacking plate 21. Another stacking plate 21 is provided with a vertical hole for avoiding the lifting screw 222 in the vertical direction, so that any group of lifting pieces 22 drives only a single stacking plate 21 to move when it works.

[0041] Referring to Figure 2 And Figure 3 When it is necessary to place goods, the two stacking plates 21 are moved to the lower end of the warehouse 2. After the goods are placed on the upper stacking plate 21, the stacking plate 21 drives the goods to be lifted by the lifting piece 22. When the distance between the two stacking plates 21 is sufficient, another piece of goods is placed on the lower stacking plate 21. The height of the stacking plate 21 in the warehouse 2 is adjustable, which is more convenient when placing goods of different sizes in the warehouse 2.

[0042] Referring to Figure 2 And Figure 4 A plurality of forks 3 are arranged in the warehouse 2. The forks 3 are arranged in pairs and oppositely. Different groups of forks 3 are arranged in the vertical direction. One group of forks 3 corresponds to one stacking plate 21. The fork 3 includes a side plate 31, a goods carrying plate 32, a moving plate one 33 and a moving plate two 34. The side plate 31 is arranged along the length direction of the stacking plate 21 and is slidably connected to the warehouse 2 along the width direction of the stacking plate 21. The warehouse 2 is fixedly connected with a receiving portion 24 corresponding to the side plate 31. The receiving portion 24 is hollow and is used for accommodating the fork 3 to avoid the fork 3 moving along the vertical direction.

[0043] Referring to Figure 2 And Figure 4The warehouse 2 is provided with a translation mechanism for driving the side plate 31 to move, the translation mechanism comprises a translation motor 281 and a translation screw 382, the translation screw 382 is arranged along the width direction of the stacking plate 21 and is rotationally connected with the warehouse 2 along its own axis, the translation motor 281 is fixedly connected with the warehouse 2, a set of chain wheels 351 is arranged between the translation motor 281 and the translation screw 382, and the translation motor 281 drives the translation screw 382 to rotate through the set of chain wheels 351 when the translation motor 281 works. The translation screw 382 penetrates through the side plate 31 and is threadedly connected with the side plate 31, and under the limiting action of the warehouse 2 and the containing part 24, the side plate 31 is driven by the translation screw 382 to move close to or away from the stacking plate 21 when the translation screw 382 rotates.

[0044] With reference to Figure 2 and Figure 4 The moving plate one 33 is located on the side of the side plate 31 close to the stacking plate 21, the side plate 31 is fixedly provided with a guide rail along the length direction, the moving plate one 33 is fixedly connected with a guide strip matched with the guide rail, the guide strip is slidingly connected with the guide rail along the length direction of the guide rail, and the side plate 31 limits the moving plate one 33 in cooperation with the guide strip. The side plate 31 is provided with a power mechanism for driving the moving plate one 33 to move, the power mechanism comprises a driving motor, two driving wheels, a synchronous belt and a rack, the two driving wheels are rotationally connected to the two ends of the side plate 31 respectively, and the two driving wheels are located at the lower end of the moving plate one 33, and the synchronous belt is wound between the two driving wheels and is rollingly connected with the driving wheels. The driving motor is fixedly connected with the side plate 31 and is used for driving any driving wheel to rotate, and under the support of the side plate 31, the driving wheel drives the synchronous belt to rotate circumferentially when the driving wheel rotates.

[0045] With reference to Figure 2 and Figure 4 The rack is fixedly connected with the lower end of the moving plate one 33 and is arranged along the length direction of the moving plate one 33, a plurality of tooth blocks are fixedly connected with the synchronous belt on the side away from the driving wheel along the circumference, the tooth blocks are engaged with the rack, and the moving plate one 33 is driven to move along the length direction when the synchronous belt rotates. The side plate 31 is provided with a plurality of positioning wheels along the length direction, the positioning wheels are located on the inner side of the synchronous belt and are rollingly connected with the upper end of the synchronous belt, thereby limiting the tendency of the synchronous belt and the rack to separate, and the connection stability of the synchronous belt and the rack is improved.

[0046] With reference to Figure 2 and Figure 4 The moving plate one 33 is located on the side of the moving plate two 34 away from the side plate 31, the moving plate one 33 drives the moving plate two 34 to move when the moving plate one 33 moves, and the cargo plate 32 is located on the side of the moving plate two 34 away from the moving plate one 33. The connecting piece 35 is arranged between the moving plate one 33 and the moving plate two 34 and between the moving plate two 34 and the cargo plate 32, and the connecting piece 35 comprises two chain wheels 351, a chain 352, a connecting block one 353 and a connecting block two 354.

[0047] With reference to Figure 2 andFigure 4 For example, the connecting piece 35 between the moving plate one 33 and the moving plate two 34, two sprockets 351 are rotatably connected to the two ends of the moving plate one 33, the moving plate one 33 drives the two sprockets 351 to move when moving, the chain 352 is engaged between the two sprockets 351, and the sprocket 351 drives the chain 352 to move when moving. The connecting block one 353 and the connecting block two 354 are circumferentially arranged along the chain 352 and are fixedly connected with the chain 352, and the other side of the connecting block one 353 is fixedly connected with the side plate 31, and the side of the connecting block two 354 away from the chain 352 is fixedly connected with the moving plate two 34.

[0048] Referring to Figure 2 and Figure 4 When the moving plate one 33 moves along the side plate 31 under the action of the power member, the chain 352 rotates under the limiting action of the connecting block one 353, and then drives the moving plate two 34 to move through the connecting block two 354, so that the moving plate two 34 is synchronized with the moving plate one 33 to elongate, and the moving plate two 34 does not need an additional driving device when moving, thereby facilitating the simplification of the driving structure and improving the moving convenience of the moving plate two 34. The same connecting piece 35 is arranged between the moving plate two 34 and the delivery plate 32, so that the moving plate two 34 drives the delivery plate 32 to move synchronously when moving, and then the delivery plate 32 realizes multi-stage movement in the length direction of the side plate 31, thereby facilitating the movement convenience of the delivery plate 32, and without the need for an additional driving mechanism.

[0049] Referring to Figure 1 and Figure 4 The side of the delivery plate 32 away from the moving plate one 33 is provided with a plurality of lever rods 321, the plurality of lever rods 321 are uniformly arranged along the length direction of the delivery plate 32, and the delivery plate 32 is provided with a rotary motor 322 for driving the lever rod 321 to rotate. In the present embodiment, the rotary motor 322 is a brushless motor, the output end of the brushless motor is perpendicular to the lever rod 321, and the output shaft of the brushless motor penetrates through the lever rod 321 and is rotatably connected with the lever rod 321. A torsional spring 323 is arranged between the output shaft of the brushless motor and the lever rod 321, and the torsional spring 323 drives the lever rod 321 to rotate when the brushless motor works. The delivery plate 32 is provided with a receiving groove for placing the lever rod 321, and the rotating direction of the lever rod 321 is perpendicular to the length direction of the delivery plate 32.

[0050] Referring to Figure 1 and Figure 4, when the goods need to be placed on the shelf, the goods are placed on the two stacks of stacking plates 21 respectively, and the corresponding goods are moved when the stacking plates 21 move. The transport plate 32 is flush with the side plate 31 and faces the corresponding goods, and the push rod 321 is initially located in the containing groove and is vertically upward. By controlling any two push rods 321 to rotate towards the goods by the rotating motor 322, the goods are between the two push rods 321, and it should be noted that among the two push rods 321 for limiting the goods, one of the push rods 321 is the closest to the shelf among all the push rods 321 on the side of the goods away from the shelf.

[0051] Referring to Figure 1 and Figure 4 When the goods are lifted to the height of the corresponding storage compartment, the transport plate 32 is brought close to the storage compartment by moving plate one 33 and moving plate two 34, so that the transport plate 32 pushes the goods to move towards the storage compartment by the push rod 321, and when the goods enter the storage compartment, the rotating part 26 is operated to retract the push rod 321, and the transport plate 32 is controlled to reset, thereby achieving the placement of the goods.

[0052] Referring to Figure 2 and Figure 5 When the goods need to be taken from the storage compartment, the transport plate 32 is controlled to extend into the storage compartment, and the transport plate 32 is on one side of the goods, and the push rod 321 farthest from the side plate 31 is turned out of the corresponding containing groove by the rotating motor 322 at this time. The transport plate 32 is retracted, and the goods are pushed to move towards the corresponding stacking plate 21 by the push rod 321, thereby achieving the taking of the goods. The stacking plate 21 is provided with a radio frequency identification device 23, and when the goods are transported, the goods are scanned and identified by the radio frequency identification device 23 to record the information of the goods.

[0053] Referring to Figure 2 and Figure 5 The end face of the warehouse 2 opening the inlet and outlet is provided with a metal curtain 4, and the metal curtain 4 is used to block the inlet and outlet. The warehouse 2 is provided with a winding assembly for winding the metal curtain 4, and the winding assembly comprises a winding roller 51, a winding motor 52, a reset leaf 53, a winding disc 54 and a guide rope 55. The winding roller 51 is located at the upper end of the corresponding inlet and outlet, and is connected with the warehouse 2 in the direction of its own axis. The winding motor 52 is fixedly connected with the warehouse 2 and is used to drive the winding roller 51 to rotate. The metal curtain 4 is wound outside the winding roller 51, and one end of the metal curtain 4 is fixedly connected with the winding roller 51. When the winding roller 51 rotates, the metal curtain 4 is wound or unwound, and when the metal curtain 4 is in the unwound state, the inlet and outlet are blocked.

[0054] Referring to Figure 2 and Figure 5The metal curtain 4 is fixedly connected with a supporting roller 41 away from one side of the winding roller 51, the supporting roller 41 is parallel to the winding roller 51, the guide rope 55 is provided with two groups, and the two groups of guide ropes 55 are located at two ends of the supporting roller 41. The winding disc 54 is located at the lower end of the corresponding inlet and outlet and is connected with the warehouse 2 in a rotating manner in the vertical direction. One end of the guide rope 55 is fixedly connected with the supporting roller 41, and the other end is wound around the winding disc 54 and is fixedly connected with the winding disc 54. The reset spring 53 is located between the winding disc 54 and the warehouse 2, when the supporting roller 41 is located close to the winding roller 51, the winding disc 54 unwinds the guide rope 55, at this time, the reset spring 53 has a tendency to drive the winding disc 54 to wind.

[0055] With reference to Figure 4 and Figure 6 When the metal curtain 4 is unwound, the reset spring 53 drives the winding disc 54 to wind the guide rope 55, and then guides the metal curtain 4 to be unwound through the guide rope 55, and makes the metal curtain 4 in a tension state and in close contact with the warehouse 2, which is beneficial to further improve the sealing effect of the metal curtain 4 on the warehouse 2. By sealing the warehouse 2 with the metal curtain 4, the warehouse 2 is in a sealed state, which is beneficial to reduce the probability of the goods on the shelf and the goods in the warehouse 2 being swept together.

[0056] With reference to Figure 4 and Figure 6 The side plate 31 is provided with a positioning groove 311 on the side close to the stacking plate 21 along the length direction, and the stacking plate 21 is fixedly connected with an extension edge 211 on both sides along the width direction. When the stacking plate 21 moves to between the two side plates 31 and the extension edge 211 is aligned with the positioning groove 311, the extension edge 211 enters the positioning groove 311 by driving the side plate 31 to move close to the stacking plate 21 through the translation member, and the side plate 31 supports the extension edge 211 through the inner wall of the positioning groove 311, which is beneficial to improve the working stability of the stacking plate 21.

[0057] With reference to Figure 3 and Figure 6 A plurality of positioning blocks 312 are arranged in the positioning groove 311 along the length direction, and the inner wall of the positioning groove 311 is provided with a cavity for accommodating the positioning blocks 312, and all the positioning blocks 312 are located in the corresponding cavities. When the extension edge 211 enters the positioning groove 311 and is between all the positioning blocks 312. The elastic member one 313 is arranged between the positioning block 312 and the side plate 31, and the elastic member one 313 is a spring, one end of the spring is fixedly connected with the side plate 31, and the other end is fixedly connected with the positioning block 312. When the extension edge 211 is between the positioning blocks 312, the elastic member pushes the positioning blocks 312 to be in close contact with the extension edge 211, which is beneficial to seal the gap between the stacking plate 21 and the extension plate, and reduce the probability of interference between the radio frequency identification devices 23 on different stacking plates 21.

[0058] With reference to Figure 3 andFigure 6 The ends of the warehouse 2 along the length direction are fixedly connected with cross beams 25, when the extension edges 211 of the stacking plates 21 are located in the positioning grooves 311, the ends along the length direction of the extension edges 211 are opposite to the cross beams 25, the cross beams 25 are provided with movable grooves 251 close to the end faces of the stacking plates 21, and supporting plates 252 are arranged in the movable grooves 251 and are hingedly connected with the cross beams 25 along the vertical direction. When the supporting plates 252 are completely in the movable grooves 251, the sides away from the hinged axes are close to the ground.

[0059] With reference to Figure 3 and Figure 6 The cross beams 25 are provided with rotating members 26 for driving the supporting plates 252 to rotate, the rotating members 26 include moving plates 261 and guide blocks 262, both ends of the supporting plates 252 along the length direction are fixedly connected with rotating columns 253, the rotating columns 253 are coaxial with the hinged axes of the supporting plates 252, and the rotating columns 253 are rotatably connected with the cross beams 25 around the axes thereof, the moving plates 261 pass through the cross beams 25 along the length direction of the rotating columns 253 and extend into the accommodating portions 24, and the moving plates 261 are slidably connected with the cross beams 25. The outer circles of the rotating columns 253 are provided with helically arranged guide grooves 254 along the circumferential direction, the guide blocks 262 are matched with the guide grooves 254, and the guide blocks 262 are slidably connected with the rotating columns 253 along the length direction of the guide grooves 254. The moving plates 261 are fixedly connected with the guide blocks 262, and when the moving plates 261 move, the guide blocks 262 are driven to move.

[0060] With reference to Figure 3 and Figure 6 The moving plates 261 and the cross beams 25 are provided with elastic members two 263, the elastic members two 263 are springs, one end of the springs is fixedly connected with the moving plates 261, and the other end is fixedly connected with the cross beams 25. The elastic members two 263 push the moving plates 261 away from the supporting plates 252 in the natural state, and at this time, the supporting plates 252 are located in the movable grooves 251. The side plates 31 are fixedly connected with top blocks 314 opposite to the moving plates 261, when the side plates 31 are close to the stacking plates 21, the top blocks 314 are brought into contact with the moving plates 261, and the moving plates 261 are driven to be close to the supporting plates 252 through the top blocks 314. When the moving plates 261 move, the rotating columns 253 are driven to rotate through the cooperation of the guide blocks 262 and the guide grooves 254, and then the supporting plates 252 are rotated.

[0061] With reference to Figure 2 and Figure 3 When the side plates 31 move to the positions closest to the stacking plates 21, the supporting plates 252 move to the horizontal state and are in contact with the lower end faces of the stacking plates 21. The supporting plates 252 support the stacking plates 21, which is favorable for further improving the working stability of the stacking plates 21, and the supporting plates 252 seal the gaps between the cross beams 25 and the stacking plates 21, which is favorable for further reducing the probability of the goods on different stacking plates 21 being swept.

[0062] With reference to Figure 2 and Figure 3 , the lower end of the warehouse 2 is connected with a driving disc 6 in a transverse rotation manner, the warehouse 2 is provided with a steering motor 61 for driving the driving disc 6 to rotate, and a plurality of polygonal holes one 62 are formed in the upper end of the driving disc 6. The stacking plate 21 is connected with a rotating disc 27 in a transverse rotation manner, the rotating disc 27 penetrates the stacking plate 21 in a vertical direction and is connected with the stacking plate 21 in a vertical sliding manner, and the rotating disc 27 is arranged in an axial floating manner, and the goods on the stacking plate 21 are located above the rotating disc 27. The lower end of the stacking plate 21 is provided with an elastic member three, which is also a spring, the lower end of the spring is fixedly connected with a rotating ring, the lower end of the rotating disc 27 is coaxially fixedly connected with a blocking ring, the rotating ring is located on the upper end of the blocking ring, and the rotating ring applies a downward thrust to the blocking ring under the action of the elastic member three, and the upper end surface of the rotating disc 27 is flush with the upper end surface of the stacking plate 21 in a natural state of the elastic member three.

[0063] With reference to Figure 2 and Figure 3 , the lower end of the rotating disc 27 is coaxially fixedly connected with a polygonal rod 271 matched with the plurality of polygonal holes one 62, and the upper end surface of the rotating disc 27 is provided with a plurality of polygonal holes two 272 matched with the polygonal rod 271. When the warehouse 2 is transported between two shelves and the orientation of the goods needs to be changed, the stacking plate 21 is controlled to move towards the driving disc 6, at this time, the polygonal rod 271 of the lower stacking plate 21 is inserted into the plurality of polygonal holes one 62, and the polygonal rod 271 of the upper stacking plate 21 is inserted into the plurality of polygonal holes two 272 of the lower stacking plate 21, in this state, no goods are placed on the lower stacking plate 21.

[0064] With reference to ​ and ​ , under the support of the driving disc 6, the rotating disc 27 is lifted up through the polygonal rod 271, so that the rotating disc 27 drives the goods to separate from the upper end surface of the stacking plate 21, at this time, the driving disc 6 drives the polygonal rod 271 to drive the rotating disc 27 to rotate, and then the goods are driven to change direction through the rotating disc 27, which is beneficial to improve the stacking convenience. Further, only the rotating disc 27 in the lower stacking plate 21 can be matched with the plurality of polygonal holes one 62 through the corresponding polygonal rod 271, so that the driving disc 6 directly drives the corresponding rotating disc 27 to rotate and adjusts the goods thereon.

[0065] The working principle of the embodiment of the application is as follows: when a plurality of goods need to be stacked, the goods are placed on the two stacking plates 21 in sequence. During the placing process, first, the two stacking plates 21 are moved to below the goods warehouse 2, the first goods are placed on the upper stacking plate 21, the stacking plate 21 is lifted by the lifting piece 22, and then the second goods are placed. When the goods are placed on the stacking plate 21 at the upper end of the goods warehouse 2, the goods do not need to be lifted during the loading process, which is beneficial to improve the stacking convenience. During the transportation process, the stacking plate 21 is supported by the side plate 31 and the supporting plate 252, and cooperates with the metal curtain 4 and the goods warehouse 2, so that the goods on different stacking plates 21 are all in a closed space, which is beneficial to scan and record the goods by the radio frequency identification device 23. When the goods are placed, all the forks 3 can work synchronously, and then the goods are placed or taken from the storage compartments at different heights of the goods shelf at the same time, which is beneficial to improve the work efficiency during the stacking and taking of the goods.

[0066] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, equivalent changes made on the basis of the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A stacking type double-extension stacker, comprising a vertically arranged column (1) and a cargo bin (2), wherein the cargo bin (2) moves back and forth along the length direction of the column (1), characterized in that: The cargo forks (3) are arranged in pairs, and are arranged vertically along the cargo warehouse (2). The two cargo forks (3) in the same group are located in the same horizontal plane and are parallel to each other. The cargo forks (3) are connected to the cargo warehouse (2) in a sliding manner in the transverse direction. The cargo warehouse (2) is provided with a translation member for driving the cargo forks (3) to move. The cargo warehouse (2) is provided with an inlet and outlet corresponding to the cargo forks (3) at both ends along the length direction. A plurality of stacking plates (21) are located in the cargo warehouse (2) and are slidably connected to the cargo warehouse (2) along the length direction of the column (1). The stacking plates (21) are parallel to each other. One stacking plate (21) corresponds to a group of cargo forks (3). The cargo warehouse (2) is provided with a lifting member (22) for driving the stacking plates (21) to move vertically. When the stacking plates (21) move, the translation member drives the cargo forks (3) to avoid the stacking plates (21). A radio frequency identification device (23) for identifying cargo is provided on the stacking plates (21); The metal curtain (4) is located outside the cargo warehouse (2) and is used to block the inlet and outlet. A reel assembly corresponding to the inlet and outlet is also provided outside the cargo warehouse (2). The reel assembly is used to drive the metal curtain (4) to reel or unreel.

2. The stacking type double-extension stacker according to claim 1, characterized in that: The cargo fork (3) includes a side plate (31), a cargo plate (32), a movable plate 1 (33) and a movable plate 2 (34). The side plate (31) is slidably connected to the cargo warehouse (2) in the transverse direction. The cargo warehouse (2) is provided with a receiving portion (24) corresponding to the side plate (31). The cargo plate (32) is located on a side of the side plate (31) close to the stacking plate (21). The movable plate 2 (34) is located on a side of the side plate (31) close to the cargo plate (32) and is slidably connected to the side plate (31) along the length direction of the side plate (31). The second plate (34) is located between the first movable plate (33) and the cargo plate (32), and is slidably connected to the first movable plate (33) and the cargo plate (32). Connecting members (35) are provided between the first movable plate (33) and the second movable plate (34), and between the second movable plate (34) and the cargo plate (32). The side plate (31) is provided with a power member for driving the first movable plate (33) to move. When the first movable plate (33) moves, the second movable plate (34) and the cargo plate (32) are driven to move in stages through the connecting member (35).

3. The stacking type double-extension stacker according to claim 2, characterized in that: The connecting member (35) includes two sprockets (351), a chain (352), a connecting block 1 (353) and a connecting block 2 (354). For the connecting member (35) between the movable plate 1 (33) and the movable plate 2 (34), the two sprockets (351) are respectively located at both ends of the movable plate 1 (33) along the length direction and are rotatably connected to the movable plate 1 (33). The chain (352) is meshed and connected between the two sprockets (351). The connecting block 1 (353) and the connecting block 2 (354) are both fixedly connected to the outside of the chain (352). The connecting block 1 (353) is fixedly connected to the side plate (31), and the connecting block 2 (354) is fixedly connected to the movable plate 2 (34).

4. The stacking type double-extension stacker according to claim 2, characterized in that: A plurality of shifting rods (321) are provided on a side of the cargo transport plate (32) away from the corresponding side plate (31). The shifting rods (321) are arranged along the length direction of the cargo transport plate (32). The cargo transport plate (32) is fixed with a rotating motor (322) corresponding to the shifting rods (321). The rotating motor (322) is used to drive the shifting rods (321) to rotate in the horizontal direction. A torsion spring (323) is provided between the shifting rod (321) and the output shaft of the rotating motor (322). The torsion spring (323) is used to limit the shifting rod (321) so that the shifting rod (321) is driven to rotate when the output shaft of the rotating motor (322) rotates.

5. The stacking type double-extension stacker according to claim 1, characterized in that: A positioning groove (311) is opened along the length direction on one side of the side plate (31) close to the stacking plate (21); an extension edge (211) adapted to the positioning groove (311) is fixedly connected to the side edge of the stacking plate (21) along the width direction; the extension edge (211) contacts the inner wall of the positioning groove (311) after entering the positioning groove (311); a plurality of telescopic positioning blocks (312) are arranged in the positioning groove (311); the side plate (31) is provided with an elastic member (313) corresponding to the positioning blocks (312); the extension edge (211) is located between all the positioning blocks (312) after entering the positioning groove (311); the elastic member (313) pushes the positioning blocks (312) to fit with the extension edge (211).

6. The stacking type double-extending stacker according to claim 1, characterized in that: The cargo warehouse (2) is fixed with cross beams (25) at both ends along the length direction. The cross beams (25) are located in the inlet and outlet. A movable groove (251) is opened along the length direction on the side of the cross beam (25) close to the stacking plate (21). A supporting plate (252) is arranged in the movable groove (251). The supporting plate (252) is rotatably connected to the cross beam (25) along the vertical direction. The cross beam (25) is provided with a rotating member (26) for driving the supporting plate (252) to rotate. When the side plate (31) is close to the cross beam (25), the rotating member (26) drives the supporting plate (252) to rotate to a horizontal state and extends out from the movable groove (251). At this time, the supporting plate (252) is located below the stacking plate (21) and is in contact with the lower end surface of the stacking plate (21).

7. The stacking type double-extension stacker according to claim 6, characterized in that: The rotating member (26) comprises a moving plate (261) and a guide block (262). The moving plate (261) is slidably connected to the cargo hold (2) along the length direction of the crossbeam (25). A second elastic member (263) is provided between the crossbeam (25) and the moving plate (261). In a natural state, the second elastic member (263) pushes the moving plate (261) in a direction away from the stacking plate (21). Rotating columns (253) are fixed at both ends of the supporting plate (252) along the length direction. The rotating columns (253) are arranged along the sliding direction of the moving plate (261). The rotating columns (253) are rotatably connected to the crossbeam (25) in the vertical direction. A spirally arranged guide groove (254) is provided on the outer circle of the rotating column (253) along the circumferential direction. The guide block (262) is located in the guide groove (254) and is slidably connected to the rotating column (253) along the guide groove (254). The moving plate (261) is fixedly connected to the guide block (262).

8. The stacking type double-extending stacker according to claim 1, characterized in that: The winding assembly comprises a winding roller (51), a winding motor (52), a reset spring (53), a winding disk (54) and a guide rope (55). The winding roller (51) is arranged along the width direction of the cargo warehouse (2) and is rotatably connected to the cargo warehouse (2). The metal curtain (4) is wound around the outside of the winding roller (51) and is fixedly connected to the winding roller (51). The winding motor (52) is fixedly connected to the cargo warehouse (2) and is used to drive the winding roller (51) to rotate. The winding disk (54) is located on the side of the inlet and outlet away from the winding roller (51) and is rotatably connected to the cargo warehouse (2). A support roller (41) is fixedly provided on the side of the metal curtain (4) away from the winding roller (51). One end of the guide rope (55) is fixedly connected to the support roller (41) and the other end is fixedly connected to the outside of the winding disk (54). The reset spring (53) is located between the winding disk (54) and the cargo warehouse (2) and is used to drive the winding disk (54) to rewind.

9. The stacking type double-extending stacker according to claim 1, characterized in that: The lower end of the cargo bin (2) is connected to a driving disk (6) for rotation along the transverse direction. The cargo bin (2) is fixed with a direction adjustment motor (61) for driving the driving disk (6) to rotate. The upper end of the driving disk (6) is provided with a multi-faceted hole (62) at the axis. The stacking plate (21) is rotatably connected to a rotating disk (27) coaxial with the driving disk (6). The rotating disk (27) vertically penetrates the stacking plate (21). The upper end of the rotating disk (27) is provided with a multi-faceted hole (272) coaxial with the multi-faceted hole (62) and having the same cross-section. The lower end of the rotating disk (27) is fixedly connected with a multi-faceted rod (271) adapted to the multi-faceted hole (62). When the multi-faceted rod (271) is located in the multi-faceted hole (62), it fits with the inner wall of the multi-faceted hole (62).

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