Sorting system capable of realizing stepless regulation on number of layers

By combining the sorting rack integration module with the height and width adjustment mechanism, the problem of the existing sorting system's inability to adjust the number of layers and layer height is solved, realizing the sorting system's flexibility, adaptability, and high-efficiency sorting.

CN223990456UActive Publication Date: 2026-03-13浙江德赞机器人有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-17
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

In existing sorting systems, the number of shelves and sorting units, as well as the shelf height and compartment width, are fixed values, which cannot meet the needs of customers under different working conditions. In particular, the size difference between summer and winter clothing in the apparel industry leads to inconsistent requirements for shelf height and compartment width.

Method used

The sorting rack adopts an integrated modular structure. The integrated modules of the sorting rack are installed, fixed and height adjusted through module support bases and height adjustment mechanisms. Combined with the width adjustment mechanism, the number and width of the compartments can be adjusted to achieve stepless adjustment of the number of layers, layer height, number of compartments and width of the sorting system.

Benefits of technology

It enables flexible adjustment of the sorting system, adapting to various working conditions and meeting the sorting needs of different customers and the same customer at different times, thereby improving sorting efficiency and applicability.

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Abstract

The utility model provides a sorting system capable of achieving stepless adjustment of the number of layers. The sorting system comprises an equipment rack, a plurality of sorting goods shelf integration modules and a height adjusting mechanism. Each sorting shelf integrated module comprises a module supporting seat, and a moving driving source, a moving transmission mechanism, a sorting trolley and a blanking shelf which are integrated on the module supporting seat, the moving driving source is connected with the sorting trolley through the moving transmission mechanism, and the blanking shelf is arranged on the side of the module supporting seat and is provided with a plurality of blanking grids which are horizontally arranged side by side; the moving direction of the sorting trolley is consistent with the side-by-side direction of a plurality of blanking grid openings in the blanking goods shelf, and the module supporting base is fixedly installed on an equipment rack through a height adjusting mechanism. The installation height of the module supporting seat is adjusted through the height adjusting mechanism, so that the overall height of the sorting goods shelf integration module is adjustable, the number of the sorting goods shelf integration module can be adjusted, customers can conveniently adjust the layer number and the layer height of the sorting trolley and the discharging goods shelf, and different requirements of multiple sorting working conditions are met.
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Description

Technical Field

[0001] This utility model relates to the field of sorting technology for goods, express parcels and other items, and in particular to a sorting system with stepless adjustment of the number of layers. Background Technology

[0002] In existing technologies, sorting systems for items such as clothing, daily necessities, and cosmetics are equipped with multi-level shelves and sorting units corresponding to each shelf level. Each shelf level includes several horizontally arranged compartments, and each sorting unit includes horizontally extending guide rails and a sorting trolley that can be horizontally moved and mounted on the guide rails. The items to be sorted are first transferred to the sorting trolley at the target shelf level, and then transported by the sorting trolley to the target compartment on that shelf, where they slide down into the receiving frame outside the compartment.

[0003] Typically, the number of layers and layer height of multi-layer shelves and multi-layer sorting units in a sorting system are fixed after installation in the equipment frame, such as the centrally located package sorting system disclosed in Chinese invention patent application number 202410682480.8. Because the number of layers and layer height of the shelves and sorting units cannot be adjusted, the sorting system cannot meet customers' needs for different numbers of layers and layer heights under different working conditions. Furthermore, the compartments on each shelf are composed of several horizontally arranged partitions. After the partitions are installed, the width of the resulting compartments is a fixed value and cannot be adjusted, thus also failing to meet customers' needs for different compartment widths under different working conditions. For example, in the clothing industry, because summer and winter clothing have significantly different sizes, sorting summer clothing requires a smaller layer height and a smaller compartment width, while sorting winter clothing requires a larger layer height and a larger compartment width.

[0004] Therefore, the existing sorting system, with its fixed number and height of shelves and sorting units, as well as the number and width of slots on each shelf, is not well-suited for multi-sorting operations. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a sorting system with stepless adjustment of the number of layers and the height of the layers, so that customers can easily adjust the number of layers and the height of the shelves and sorting units.

[0006] To achieve the above objectives, this utility model provides a sorting system with stepless adjustment of the number of layers, including an equipment frame, several vertically arranged sorting rack integrated modules, and a height adjustment mechanism. Each sorting rack integrated module includes a module support base, and a mobile drive source, a mobile transmission mechanism, a sorting trolley, and a discharge rack all integrated on the module support base. The sorting trolley is movably installed on the module support base, and the mobile drive source is connected to the sorting trolley through the mobile transmission mechanism. The discharge rack is located on the side of the module support base and has several horizontally arranged discharge slots. The moving direction of the sorting trolley is consistent with the parallel direction of the discharge slots in the discharge rack. The module support base is fixedly installed on the equipment frame through the height adjustment mechanism.

[0007] Furthermore, the equipment frame has vertically extending columns, the module support base has a module mounting block, and the height adjustment mechanism includes several vertical adjustment slots opened on the columns and a first fastening screw. The module mounting block and the columns are fixedly connected by the first fastening screw, which passes through the vertical adjustment slots of the columns.

[0008] Furthermore, the equipment frame has vertically extending columns, and the height adjustment mechanism includes a clamp fixed to the module support base and a second fastening screw for locking the clamp, the clamp being clamped to the outer periphery of the column.

[0009] Furthermore, the material drop rack includes a rack base plate, several horizontally arranged grid side plates, and a width adjustment mechanism. The rack base plate is fixedly connected to the module support base, and the grid side plates are fixedly installed on the rack base plate through the width adjustment mechanism. The material drop grid is formed between two adjacent grid side plates.

[0010] Furthermore, the width adjustment mechanism is located at the connection between each grid side panel and the shelf base plate. The bottom of each grid side panel is provided with a side panel fixing part. The width adjustment mechanism includes a horizontal adjustment groove opened on the shelf base plate and a third fastening screw. The side panel fixing part and the shelf base plate are fixedly connected by the third fastening screw, which passes through the horizontal adjustment groove of the upright.

[0011] Furthermore, there are two material discharge racks, which are distributed on both sides of the module support base in a direction perpendicular to the direction of movement of the sorting trolley.

[0012] Furthermore, the mobile drive source is a motor, and the mobile transmission mechanism includes a driving pulley and a driven pulley that are rotatably mounted on the module support base, and a synchronous belt connected to the outer periphery of the driving pulley and the driven pulley. The mobile drive source is connected to the driving pulley, and the synchronous belt is fixedly connected to the frame of the sorting cart.

[0013] Furthermore, the sorting rack integration module also includes a guide rail fixed to the module support base. The guide rail extends straight along the moving direction of the sorting trolley, and the sorting trolley is equipped with guide wheels that cooperate with the guide rail.

[0014] Furthermore, the sorting trolley includes a frame, a trolley drive source mounted on the frame, an active roller and a driven roller rotatably mounted on the frame, and a conveyor belt connected to the outer periphery of the active roller and the driven roller, wherein the trolley drive source is connected to the active roller.

[0015] As described above, the sorting system with stepless adjustment of the number of layers involved in this utility model has the following beneficial effects:

[0016] The sorting system of this application adopts a sorting rack integrated module structure. The sorting rack integrated module is installed and fixed on the equipment frame by the installation and fixing of the module support base on the equipment frame. The installation height of the module support base can be adjusted by the height adjustment mechanism, so that the overall height of the sorting rack integrated module can be adjusted. The number of sorting rack integrated modules can also be adjusted, so as to facilitate customers to adjust the number and height of the sorting carts and unloading racks to meet the different needs of multiple sorting conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a sorting system according to Embodiment 1 of this application.

[0018] Figure 2 for Figure 1 The structural diagram after the unloading rack is omitted.

[0019] Figure 3 for Figure 2 Enlarged view of circle A.

[0020] Figure 4 This is a schematic diagram of the unloading rack in the sorting system of this application.

[0021] Figure 5 for Figure 4 A schematic diagram showing the connection between the side panel of a single compartment and the bottom panel of the shelving unit.

[0022] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the sorting system of this application.

[0023] Figure 7 for Figure 6 A structural diagram omitting the unloading rack and the feeding and packaging equipment.

[0024] Component designation explanation

[0025] 10 Equipment racks

[0026] 101 pillars

[0027] 20 sorting rack integrated modules

[0028] 30 Height Adjustment Mechanism

[0029] 31 Vertical Adjustment Slot

[0030] 32 First fastening screw

[0031] 40 Module Support Base

[0032] 41 Module Installation Block

[0033] 50 Mobile Driver Sources

[0034] 60. Moving transmission mechanism

[0035] 61 Synchronous Belt

[0036] 70 sorting carts

[0037] 71 Guide Wheel

[0038] 80 Unloading rack

[0039] 81 Blanking grid

[0040] 82 Shelf base

[0041] 83 Grid side panels

[0042] 831 Side panel fixing part

[0043] 84 Width Adjustment Mechanism

[0044] 841 Lateral Adjustment Slot

[0045] 90 guide rail

[0046] 110 Material feeding and packaging equipment

[0047] 120 Lifting Cart Detailed Implementation

[0048] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0049] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0050] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0052] like Figure 1 and Figure 2 ,or Figure 6As shown, this utility model provides a sorting system with stepless adjustment of the number of layers, including a machine frame 10, several sorting rack integrated modules 20 arranged vertically side by side, and a height adjustment mechanism 30. Each sorting rack integrated module 20 includes a module support base 40, and a mobile drive source 50, a mobile transmission mechanism 60, a sorting trolley 70, and a discharge rack 80, all integrated on the module support base 40. The sorting trolley 70 is movably installed on the module support base 40, and the mobile drive source 50 is connected to the sorting trolley 70 through the mobile transmission mechanism 60. The discharge rack 80 is located on the side of the module support base 40 and has several horizontally arranged discharge slots 81. The moving direction of the sorting trolley 70 is consistent with the parallel direction of the several discharge slots 81 in the discharge rack 80. In this embodiment, the moving direction of the sorting trolley 70 and the parallel direction of the several discharge slots 81 are defined as the left-right direction. The module support base 40 is fixedly installed on the equipment frame 10 through the height adjustment mechanism 30, so that the sorting rack integration module 20 is fixedly installed on the equipment frame 10 as a whole through the height adjustment mechanism 30.

[0053] When the sorting system is in operation, the items to be sorted are transported to the sorting cart 70 of the sorting rack integration module 20 of the corresponding layer according to the sorting requirements. The moving drive source 50 in the sorting rack integration module 20 drives the sorting cart 70 to move left and right through the moving transmission mechanism 60. The sorting cart 70 transports the items to be sorted to the target dropping slot 81 of the sorting rack integration module 20. The items to be sorted then slide down through the dropping slot 81 to the dropping port located outside the dropping slot 81, thereby realizing the automatic sorting of items.

[0054] Specifically, the sorting system adopts a sorting rack integrated module 20 structure. The module support base 40 is installed, fixed, and height-adjusted on the equipment frame 10 via a height adjustment mechanism 30. The mobile drive source 50, mobile transmission mechanism 60, sorting trolley 70, and unloading rack 80 within the sorting rack integrated module 20 are all integrated onto the module support base 40. This allows for the installation, fixation, and height adjustment of components such as the mobile drive source 50, mobile transmission mechanism 60, sorting trolley 70, and unloading rack 80 on the equipment frame 10. In other words, it enables the overall installation, fixation, and height adjustment of the sorting rack integrated module 20 on the equipment frame 10, facilitating the adjustment of the number and installation height of the sorting rack integrated modules 20. This also allows customers to easily adjust the number and height of the sorting trolley 70 and unloading rack 80 layers to meet different needs in various sorting scenarios. For example, when the sorting rack is used for sorting clothing, the layer height can be adjusted to be smaller for summer clothing and larger for winter clothing.

[0055] Furthermore, the equipment frame 10 has four vertically extending columns 101, and the module support base 40 is a horizontal frame structure. The four columns 101 are distributed at the four corners of the outer perimeter of the module support base 40. The module support base 40 is installed on the four columns 101 through a height adjustment mechanism 30. The height adjustment mechanism 30 can adopt a hole adjustment structure, a clamp adjustment structure, a slide rail slider adjustment structure, etc.

[0056] When the height adjustment mechanism 30 adopts a hole position adjustment structure, such as Figure 2 and Figure 3 As shown, the module support base 40 has a module mounting block 41, and the height adjustment mechanism 30 includes several vertical adjustment slots 31 formed on the column 101, and a first fastening screw 32. The module mounting block 41 and the column 101 are fixedly connected by the first fastening screw 32, which passes through the vertical adjustment slots 31 of the column 101. The vertical adjustment slots 31 are elongated slots extending vertically. By adjusting the first fastening screw 32 to lock at different heights in different vertical adjustment slots 31, the installation height of the module support base 40 can be infinitely adjusted, thereby realizing the adjustment of the number of layers and layer height of the sorting cart 70 and the unloading rack 80.

[0057] When the height adjustment mechanism 30 adopts a clamp adjustment structure, the height adjustment mechanism 30 includes a clamp (i.e., a clamping hoop) fixed to the module support base 40, and a second fastening screw to lock the clamp. The clamp is clamped to the outer periphery of the column 101. By adjusting the different height positions of the clamp locked on the column 101 by the second fastening screw, the installation height of the module support base 40 can be steplessly adjusted, thereby realizing the adjustment of the number of layers and layer height of the sorting cart 70 and the unloading rack 80.

[0058] When the height adjustment mechanism 30 adopts a slide rail slider adjustment structure, the height adjustment mechanism 30 includes a slide rail fixed to the column 101 and an adjustment slider that slides with the slide rail. The adjustment slider is fixed to the module support base 40. At this time, a motor and a lead screw and nut mechanism can be used to drive the adjustment slider to move up and down along the slide rail, so that the adjustment slider is in different height positions, thereby realizing stepless adjustment of the installation height of the module support base 40, and thus realizing the adjustment of the number of layers and layer height of the sorting trolley 70 and the unloading rack 80.

[0059] Furthermore, such as Figure 1 and Figure 4As shown, the material drop rack 80 includes a rack base plate 82, several horizontally arranged grid side plates 83, and a width adjustment mechanism 84. The rack base plate 82 is fixedly connected to the module support base 40. The grid side plates 83 are fixedly installed on the rack base plate 82 through the width adjustment mechanism 84, and the material drop grids 81 are formed between two adjacent grid side plates 83. The width adjustment mechanism 84 allows for adjustment of the installation position of each grid side plate 83 on the rack base plate 82, thereby adjusting the width and number of material drop grids 81 to meet the different needs of various sorting conditions. For example, when sorting summer clothing, the width of the material drop grids 81 can be reduced, and when sorting winter clothing, the width of the material drop grids 81 can be increased.

[0060] Preferably, such as Figure 4 and Figure 5 As shown, the width adjustment mechanism 84 is located at the connection between each grid side panel 83 and the shelf base plate 82, and there are two sets of them. The two sets of width adjustment mechanisms 84 are distributed along the width direction of the shelf base plate 82 at the front and rear edges of the shelf base plate 82. At the bottom of each grid side panel 83, there is a side panel fixing part 831. The width adjustment mechanism 84 includes a transverse adjustment groove 841 opened on the shelf base plate 82 and a third fastening screw. The side panel fixing part 831 and the shelf base plate 82 are fixedly connected by the third fastening screw, which passes through the transverse adjustment groove 841 of the upright 101. The width adjustment mechanism 84 is a long groove extending along the parallel direction of several material drop grids 81. By adjusting the third fastening screw to lock different horizontal positions in different transverse adjustment grooves 841, the horizontal installation position of the grid side panel 83 can be infinitely adjusted, thereby realizing the infinitely adjustable width and number of material drop grids 81.

[0061] Preferably, such as Figure 1 As shown, there are two material drop racks 80. The two material drop racks 80 are distributed on the front and rear sides of the module support base 40 in a direction perpendicular to the movement direction of the sorting trolley 70, which can increase the number of material drop slots 81 and improve sorting efficiency.

[0062] Furthermore, such as Figure 1 and Figure 2 As shown, the mobile drive source 50 is a motor, and the mobile transmission mechanism 60 includes a driving pulley and a driven pulley, both rotatably mounted on the module support base 40, and a synchronous belt 61 connected to the outer periphery of the driving pulley and the driven pulley. The mobile drive source 50 is connected to the driving pulley, and the synchronous belt 61 is fixedly connected to the frame of the sorting cart 70. The motor drives the sorting cart 70 to move horizontally through the synchronous belt 61 mechanism. Preferably, the sorting rack integrated module 20 also includes a guide rail 90 fixed to the module support base 40. The guide rail 90 extends horizontally along the moving direction of the sorting cart 70, and the sorting cart 70 is equipped with guide wheels 71 that cooperate with the guide rail 90 to improve the stability of the horizontal movement of the sorting cart 70.

[0063] Furthermore, such as Figure 1 and Figure 2 As shown, the sorting trolley 70 includes a frame, a trolley drive source mounted on the frame, an active roller and a driven roller rotatably mounted on the frame, and a conveyor belt connected to the outer periphery of the active roller and the driven roller. The trolley drive source is connected to the active roller and drives the conveyor belt to rotate backward or forward, so that the sorting trolley 70 can unload materials to the unloading racks 80 on its front and rear sides.

[0064] Furthermore, during the operation of the sorting system, the items to be sorted can be placed directly onto the sorting cart 70 of the target layer by manual loading. Alternatively, as... Figure 6 and Figure 7 As shown, the sorting system is equipped with a feeding and packaging device 110 and a vertically movable lifting trolley 120. Both the feeding and packaging device 110 and the lifting trolley 120 adopt a conveyor belt structure, with the lifting trolley 120 located at the output end of the feeding and packaging device 110. Workers place the items to be sorted on the conveyor belt of the feeding and packaging device 110, which then transports the items to the lifting trolley 120. The lifting trolley 120 moves the items to the target layer of the sorting rack integrated module 20, and then transfers them to the target layer of the sorting trolley 70, which then transports them to the target discharge slot 81, resulting in a higher degree of automation. Furthermore, the feeding and packaging device 110 can be located at the end of the sorting system, or... Figure 6 and Figure 7 As shown, the material feeding and packaging equipment 110 is located in the middle of the sorting system, making the sorting system a centrally located packaging structure, which better improves sorting efficiency.

[0065] In summary, this application achieves stepless adjustment of the number of layers and layer height of the sorting cart 70 and the unloading rack 80, as well as the stepless adjustment of the width and number of unloading slots 81. This allows a single sorting system to be well-suited for various working conditions of different customers, various working conditions of the same customer, and working conditions of the same customer at different times. Users can arbitrarily allocate the required number of layers and layer height of the sorting cart 70 and the unloading rack 80, as well as the required width and number of unloading slots 81, according to their own production capacity needs. Ultimately, this enables a single sorting system to be suitable for any customer, realizing the conversion from non-standard customized equipment to standard machines.

[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A sorting system with stepless adjustment of the number of layers and height of the layers, comprising an equipment rack (10), characterized in that: The device rack (10) has an up-and-down extending column (101), the module support base (40) has a module mounting block (41), the height adjusting mechanism (30) comprises a plurality of vertical adjusting grooves (31) opened on the column (101) and a first fastening screw (32), the module mounting block (41) and the column (101) are fixedly connected through the first fastening screw (32), and the first fastening screw (32) is arranged in the vertical adjusting groove (31) of the column (101).

2. The layer height and number stepless adjustment sorting system according to claim 1, characterized in that: The device rack (10) has an up-and-down extending column (101), the height adjusting mechanism (30) comprises a plurality of vertical adjusting grooves (31) opened on the column (101) and a first fastening screw (32), the module mounting block (41) and the column (101) are fixedly connected through the first fastening screw (32), and the first fastening screw (32) is arranged in the vertical adjusting groove (31) of the column (101).

3. The layer height and number of layers stepless adjustment sorting system according to claim 1, characterized in that: The device rack (10) has an up-and-down extending column (101), the height adjusting mechanism (30) comprises a plurality of vertical adjusting grooves (31) opened on the column (101) and a first fastening screw (32), the module mounting block (41) and the column (101) are fixedly connected through the first fastening screw (32), and the first fastening screw (32) is arranged in the vertical adjusting groove (31) of the column (101).

4. The layer height and number of layers stepless adjustment sorting system according to claim 1, characterized in that: The material falling rack (80) comprises a rack bottom plate (82), a plurality of horizontally arranged groove side plates (83) and a width adjusting mechanism (84), the rack bottom plate (82) is fixedly connected with the module support base (40), the groove side plates (83) are fixedly installed on the rack bottom plate (82) through the width adjusting mechanism (84), and the material falling grooves (81) are formed between two adjacent groove side plates (83).

5. The layer height and number of layers stepless adjustment sorting system according to claim 4, characterized in that: The width adjusting mechanism (84) is arranged at the connection between each groove side plate (83) and the rack bottom plate (82), the bottom of the groove side plate (83) is provided with a side plate fixing portion (831), the width adjusting mechanism (84) comprises a transverse adjusting groove (841) opened on the rack bottom plate (82) and a third fastening screw, the side plate fixing portion (831) and the rack bottom plate (82) are fixedly connected through the third fastening screw, and the third fastening screw is arranged in the transverse adjusting groove (841) of the column (101).

6. The sorting system with stepless adjustment of the number of layers and height of the layers according to claim 1 or 4, characterized in that: The material falling rack (80) has two, and the two material falling racks (80) are distributed on the two side edges of the module support base (40) in a direction perpendicular to the moving direction of the sorting trolley (70).

7. The layer height and number of layers stepless adjustment sorting system according to claim 1, characterized in that: The mobile driving source (50) is an electric motor, the mobile transmission mechanism (60) comprises a driving pulley and a driven pulley rotatably mounted on the module support base (40), and a synchronous belt (61) connected to the outer periphery of the driving pulley and the driven pulley, the mobile driving source (50) is connected to the driving pulley, and the synchronous belt (61) is fixedly connected to the frame of the sorting trolley (70).

8. The layer height and number of layers stepless adjustment sorting system according to claim 1, characterized in that: The sorting shelf integrated module (20) further comprises a guide rail (90) fixed to the module support base (40), the guide rail (90) extends straight along the moving direction of the sorting trolley (70), and the sorting trolley (70) is provided with a guide wheel (71) matched with the guide rail (90).

9. The layer height and number of layers stepless adjustment sorting system according to claim 1, characterized in that: The sorting trolley (70) comprises a frame, a trolley driving source mounted on the frame, a driving roller and a driven roller rotatably mounted on the frame, and a conveying belt connected to the outer periphery of the driving roller and the driven roller, and the trolley driving source is connected to the driving roller.

Citation Information

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