Movable goods shelf

Abstract

The invention discloses a movable goods shelf which comprises ground rails, a plurality of connected goods shelf sets, a plurality of bearing beams, a driving motor and connecting rods, the bearing beams are arranged on the ground rails through driving wheels and driven wheels, each bearing beam is connected with one ground rail, the driving wheels on the adjacent bearing beams are connected through the connecting rods, the driving motor is connected with any bearing beam, and the connecting rods are connected with the connecting rods. The driving motors are in transmission connection with the driving wheels in the bearing beams to drive the bearing beams to move in the extending direction of the ground rail, the lower portions of the goods shelf sets are connected with two adjacent bearing beams, and the adjacent edges of the adjacent goods shelf sets are located on the same bearing beam; the goods shelf modules are sequentially arranged on the ground rail in a front-and-back mode. According to the movable goods shelf provided by the invention, the deformation of the whole row of goods shelves due to asynchronism of a plurality of driving motors can be effectively avoided; the invention provides a movable goods shelf, belongs to the technical field of storage equipment, and is applied to an intelligent storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of warehousing equipment, and particularly relates to a movable shelf. Background Art

[0002] Mobile shelves are an important part of modern warehousing equipment, which can effectively save warehousing space. Multiple rows of mobile shelves are arranged on the same track, and the multiple rows of shelves can move relative to each other to leave a passage for staff to quickly take out the items on the warehousing shelves.

[0003] However, users have found that the existing mobile shelves have the following problems. First, for the existing mobile shelves, each row of shelves includes a plurality of interconnected shelves, and a driving motor needs to be provided below each shelf to drive the entire row of shelves to slide along the ground track. The number of driving motors to be provided is large, and the cost is high. Moreover, in the multi-motor driving method, as long as one of the driving motors fails, during the continued movement of other motors, it may cause the deformation of the entire row of shelves, or it may increase the heat generation of the faulty motor. In addition, when multiple driving motors drive the entire row of shelves to move, the asynchronism between the multiple driving motors cannot be avoided. After a long time of use, it is also easy to cause the deformation of the entire row of shelves. Summary of the Invention

[0004] The purpose of the present invention is to provide a movable shelf to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] To solve the above technical problems, the technical solutions adopted by the present invention are as follows: First, the present invention provides a movable shelf, including: Ground tracks, and a plurality of the ground tracks are parallel and evenly spaced; Shelf modules, the shelf modules include a plurality of interconnected shelf groups, a plurality of supporting beams, a driving motor, and a connecting rod. The supporting beams are arranged on the ground tracks through driving wheels and driven wheels. Each of the supporting beams is connected to one of the ground tracks, and the supporting beams are arranged parallel to the ground tracks. The driving wheels on adjacent supporting beams are connected by the connecting rod. The driving motor is connected to any one of the supporting beams, and the driving motor is in transmission connection with the driving wheel of the supporting beam where it is located to drive the supporting beam to move along the extending direction of the ground track. The lower part of the shelf group is connected to two adjacent supporting beams, and the adjacent edges of adjacent shelf groups are located on the same supporting beam; Taking the extending direction of the ground track as the front-back direction, a plurality of the shelf modules are arranged in sequence in the front-back direction on the ground tracks.

[0006] In this solution, by setting connecting rods between multiple shelf groups, while driving the driving motor to drive the driving wheel, all shelf groups are driven through the connecting rods, enabling multiple shelf groups to be stably driven simultaneously by one driving motor. Therefore, there is no need to add an excessive number of driving motors. During daily use, when the movable shelves malfunction, they can be quickly repaired. This solution can avoid the problems of unstable startup and easy tipping of goods caused by the synchronization difference between driving motors when each shelf group is driven by an independent driving motor, and can also avoid damage to some of the driving motors due to poor synchronization between multiple driving motors. Additionally, by setting the support beam below the adjacent edges of adjacent shelves, the connection points of the connected shelves can have the same traveling speed, reducing the probability of deformation of multiple shelf groups. In this solution, the type of the driving motor is selected according to the designed load of the shelf module.

[0007] As an extension of the above solution, the driving motor is arranged on the middle support beam among multiple support beams. Specifically, it is arranged on one of the middle support beams among multiple support beams, or on any one of the two middle support beams. For example, in some cases, the number of shelf groups is even, and the number of support beams used is odd. The driving motor is arranged at the middle support beam. In some cases, the number of shelf groups is odd, and the number of support beams used is even. The driving motor is arranged on any one of the two middle support beams. In this solution, the driving motor is arranged in the middle, which can reduce the loss of the driving force of the driving motor during transmission.

[0008] As an extension of the above solution, the driving motor has a first output shaft and a second output shaft with coaxial output. The first output shaft is arranged on the opposite side of the second output shaft. The first output shaft is connected to the driving wheel, and the second output shaft is connected to the connecting rod and through the connecting rod to the driving wheel on the support beam on the opposite side. Through such an arrangement, in essence, the driving motor directly drives one of the driving wheels, which can further reduce the loss of the driving force of the driving motor during transmission.

[0009] As an extension of the above solution, a movable shelf further includes an induction module. The induction module includes a control module and an inductor. The inductor is connected to the shelf module, the inductor is electrically connected to the control module, the control module is electrically connected to the driving motor, and the control module is arranged outside the shelf module.

[0010] Since sensors are provided on the shelf module, during the movement, when the sensors on the shelf module detect that someone is approaching or a cargo is falling, signals can be output to the control module, and the control module controls the motor to stop urgently, which can improve production safety, effectively avoid personal injuries, and prevent the cargo from being crushed by the moving shelf module after falling, thus avoiding safety accidents.

[0011] In addition, during the forward and backward movement of a certain shelf module, the sensor can detect the distance between the moving shelf module and the adjacent shelf module in the moving direction, and output signals to the control module. The control module outputs signals to the driving motor, so that during the process of the moving shelf module gradually approaching the adjacent shelf module, by controlling the braking force of the driving motor itself, the moving shelf module can be made to contact the adjacent shelf module smoothly, avoiding one of the shelf modules from damaging the adjacent shelf module due to its own inertia during the movement.

[0012] Working principle: The user inputs control commands through an external control module; The control module outputs signals to make the driving motor operate; During the movement, the sensor detects the distance to the obstacles in the moving direction; The sensor transmits the distance signal back to the control module; When the distance reaches a certain set value, the control module outputs signals to control the driving motor to decelerate. When the moving shelf module contacts the adjacent shelf module, the control module outputs signals to control the driving motor to reverse slowly and then stop rotating quickly.

[0013] As an extension of the above solution, the shelf group includes two shelves arranged front and back. Such a setting makes one shelf module include two rows of shelf units arranged front and back, and each row of shelf units includes multiple shelves. In essence, one driving motor drives multiple shelves to move simultaneously, which can greatly reduce the number of driving motors used, effectively reduce the economic cost, and the shelves operate more smoothly.

[0014] Especially in some storage warehouses, the storage site has enough depth to allow the setting of multiple rows of shelf modules arranged front and back, but does not have enough length to arrange multiple shelf groups in the left - right direction. Therefore, the setting method of this solution is beneficial to expanding the storage capacity in a storage site with limited area, can greatly reduce the number of driving motors used, and can effectively reduce the economic cost.

[0015] As an extension of the above solution, the supporting beam is a U-shaped square tube with a notch facing downward. The driving wheel and the driven wheel are both arranged in the notch of the U-shaped square tube and are rotatably connected to the two side walls of the U-shaped square tube.

[0016] Specifically, the U-shaped square tube is placed with the opening facing downward, and in particular, the gap between the edge of the U-shaped square tube and the ground is set to be smaller, so that the ground rail can be covered in the supporting beam as much as possible, and foreign objects can be prevented from falling onto the ground rail.

[0017] As an extension of the above solution, first extension plates extend outward from the lower edges of the left and right sides of the U-shaped square tube, and fixed baffles are provided at the front and rear ends of the U-shaped square tube. The fixed baffles include vertically arranged side plates, an upper plate, and a lower plate. The upper plate is connected to the top of the side plates, and the lower plate is connected to the bottom of the side plates. The U-shaped square tube is located between the upper and lower plates. The upper plate is pressed against the top surface of the end of the U-shaped square tube, and the lower plate supports the end of the U-shaped square tube and the first extension plates. By connecting fixed baffles at the front and rear ends of the U-shaped square tube, this solution can firstly further prevent foreign matter from entering between the ground rail and the U-shaped square tube. Secondly, by having the first extension plate extend outward from the lower edge of the U-shaped square tube and using the fixed baffles to connect the upper and lower end surfaces of the U-shaped square tube, the load-bearing capacity of the supporting beam can be enhanced.

[0018] As an extension of the above solution, the inner wall of the U-shaped square tube is connected to a plurality of support columns, which can further enhance the load-bearing capacity of the supporting beam and prevent deformation.

[0019] As an extension of the above solution, support pallets are provided within the U-shaped square tube, connected to both side and top inner walls of the U-shaped tube. The support pallets are rectangular thin plate members, with their thickness extending in the front-to-back direction. This further enhances the load-bearing capacity of the load-bearing beams compared to the above solution. Furthermore, since the shelves are connected to the U-shaped square tube via their legs, the support pallets can be positioned below the legs, thereby increasing the load-bearing capacity of the U-shaped tube with fewer support pallets.

[0020] As an extension of the above solution, flange couplings are connected to both sides of the driving wheel. By arranging the flange couplings on the driving wheel, it is convenient to connect the driving wheel to a power source.

[0021] The movable shelf provided by the present invention arranges the driving device on the supporting beam under the middle shelf group among a plurality of the shelf groups, and transmits power to other shelves through the transmission device, so as to realize that a driving motor drives a plurality of shelf groups to run simultaneously, and can make the movement of a plurality of shelf groups more stable. The movable shelf provided by the present invention belongs to the technical field of warehousing equipment and is applied to the field of intelligent warehousing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the drawings and embodiments; Figure 1 is an overall schematic diagram of the movable shelf provided by the present invention; Figure 2 is a partial schematic diagram of the movable shelf provided by the present invention; Figure 3 is a schematic diagram of the supporting beam provided by the embodiment; Figure 4 is a schematic diagram of the fixed baffle provided by the embodiment.

[0023] In the drawings: 100, ground rail; 200, shelf module; 201, shelf group; 2011, shelf; 202, driving motor; 203, supporting beam; 2031, U-shaped square tube; 20311, first extension plate; 2032, driving wheel; 20321, flange coupling; 2033, driven wheel; 2034, fixed baffle; 20341, side plate; 20342, upper plate; 20343, lower plate; 2035, support column; 2036, support card plate; 204, connecting rod; 300, induction module; 301, control module; 302, inductor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] This part will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, if there are descriptions with words such as "several", its meaning is one or more, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the base number, and understandings such as above, below, within, etc. include the base number.

[0027] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0028] Refer to Figures 1 to 4 , and several embodiments of a movable shelf of the present invention will be given below.

[0029] As Figures 1 to 4 shown, a movable shelf includes: Floor rails 100, several of the floor rails 100 are parallel and evenly spaced; Shelf modules 200, the shelf modules 200 include several connected shelf groups 201, several supporting beams 203, a driving motor 202, and a connecting rod 204. The supporting beams 203 are arranged on the floor rails 100 through driving wheels 2032 and driven wheels 2033. Each supporting beam 203 is connected to one of the floor rails 100 respectively, the supporting beams 203 are arranged parallel to the floor rails 100, the driving wheels 2032 on adjacent supporting beams 203 are connected through the connecting rod 204, the driving motor 202 is connected to any one of the supporting beams 203, and the driving motor 202 is in transmission connection with the driving wheel 2032 of the supporting beam 203 where it is located to drive the supporting beam 203 to move along the extending direction of the floor rail 100. The lower part of the shelf group 201 is connected to two adjacent supporting beams 203, and the adjacent edges of adjacent shelf groups 201 are located on the same supporting beam 203; Taking the extending direction of the floor rail 100 as the front-rear direction, multiple shelf modules 200 are arranged in sequence front and back on the floor rail 100. The length of the floor rail 100 is greater than the total length of multiple shelf modules 200 to leave space for the shelf modules to move, facilitating the staff to take out the goods.

[0030] Wherein the supporting beam 203 is a U-shaped square tube 2031, the notch of the U-shaped square tube 2031 faces downward, and both the driving wheel 2032 and the driven wheel 2033 are arranged in the notch of the U-shaped square tube 2031 and are rotatably connected to the U-shaped square tube 2031, which can cover the floor rail 100 within the supporting beam 203 as much as possible and avoid foreign objects from falling onto the floor rail 100 as much as possible.

[0031] And flanged couplings 20321 are connected to both sides of the driving wheel 2032, which is convenient for connecting a power source to the driving wheel 2032.

[0032] The driving motor 202 has a first output shaft and a second output shaft that are coaxially output. The first output shaft is provided on the opposite side of the second output shaft. The first output shaft is connected to the driving wheel 2032, and the second output shaft is connected to the connecting rod 204 and is connected to the driving wheel 2032 on the supporting beam 203 on the opposite side through the connecting rod 204. Through such a setting, in essence, the driving motor 202 is used to directly drive one of the driving wheels 2032, which can further reduce the loss of the driving force of the driving motor 202 during the transmission process. Flange couplings 20321 are also provided on the first output shaft and the second output shaft, and flange couplings 20321 are provided at both ends of the connecting rod 204.

[0033] In this solution, by arranging the connecting rod 204 between multiple shelf groups 201, using the driving motor 202 to drive the driving wheels 2032, and through link transmission, all the shelf groups 201 can be driven simultaneously. One driving motor 202 can stably drive the multiple shelf groups 201 at the same time, without the need to set a large number of driving motors 202. During daily use, when the movable shelves fail, they can be quickly repaired; this solution can also avoid the problems of unstable start-up and easy dumping of goods caused by the synchronization difference between the driving motors 202 when each shelf group 201 is driven by an independent driving motor 202, and can avoid damage to some of the driving motors 202 due to the poor synchronization between multiple driving motors 202. Especially in some storage warehouses, the storage site has enough depth to allow the arrangement of multiple rows of shelf modules arranged front and back, but does not have enough length to arrange multiple shelf groups in the left-right direction. The setting method of this solution is beneficial to expanding the storage capacity in a storage site with a limited area, can greatly reduce the number of driving motors used, and can effectively reduce the economic cost. In addition, by arranging the supporting beam 203 below the adjacent edges of adjacent shelf groups, the connecting parts of the connected shelf groups 201 can have the same traveling speed, reducing the probability of deformation at the joints of the multiple shelf groups 201.

[0034] In this solution, the type selection of the driving motor is determined according to the designed load of the shelf module.

[0035] As a more preferred situation that conforms to production practices, the number of the shelf groups 201 can be set to three or four or five. When the number of the shelf groups 201 is three, the number of the used supporting beams 203 is four, and the number of the shelves 2011 actually driven by one driving motor 202 is six; When the number of the shelf groups 201 is four, the number of the used supporting beams 203 is five, and the number of the shelves 2011 actually driven by one driving motor 202 is eight; When the number of the shelf groups 201 is five, the number of the supporting beams 203 used is six, and the number of the shelves 2011 actually driven by one driving motor 202 is ten.

[0036] In some embodiments, the driving motor 202 is arranged at the middle position of the shelf module 200. For example, when the number of the shelf groups 201 is three, the number of the supporting beams 203 used is four, and the driving motor 202 is arranged at one of the second supporting beam 203 or the third supporting beam 203; For another example, when the number of the shelf groups 201 is four, the number of the supporting beams 203 used is five, and the driving motor 202 is arranged at the third supporting beam 203; For still another example, when the number of the shelf groups 201 is five, the number of the supporting beams 203 used is six, and the driving motor 202 is arranged at one of the third supporting beam 203 or the fourth supporting beam 203; by arranging the driving motor 202 in the middle, the loss of the driving force of the driving motor 202 during the transmission process can be reduced. Those skilled in the art can understand that the driving motor 202 is matched with the corresponding number of shelf groups 201, and according to the performance of different driving motors 202, the number of the shelf groups 201 can also be greater than six.

[0037] In some embodiments, a movable shelf further includes an induction module 300. The induction module 300 includes a control module 301 and an inductor 302. The inductor 302 is connected to the shelf module 200, the inductor 302 is electrically connected to the control module 301, the control module 301 is electrically connected to the driving motor 202, and the control module 301 is arranged outside the shelf module 200. The inductor 302 is simultaneously arranged on the front and rear sides of any one of the shelf groups 201.

[0038] Since the inductor 302 is arranged on the shelf module 200, during the movement, when the inductor 302 on the shelf module 200 detects that someone is approaching or a cargo drops, a signal can be output to the control module 301, and the control module 301 controls the driving motor 202 to stop urgently, which can improve the production safety, effectively avoid personal injury and avoid the cargo being crushed by the moving shelf module 200 after dropping, and avoid safety accidents.

[0039] In addition, during the forward and backward movement of a certain shelf module 200, the sensor 302 can detect the distance between the moving shelf module 200 and the adjacent shelf module 200 in the moving direction, and output a signal to the control module 301. The control module 301 outputs a signal to the drive motor 202, so that during the process of the moving shelf module 200 gradually approaching the adjacent shelf module 200, it can, according to a set program, control the braking force of the drive motor 202 itself to achieve the smooth contact of the moving shelf module 200 with the adjacent shelf module 200, and prevent one of the shelf modules 200 from damaging the adjacent shelf module 200 due to its own inertia during the movement.

[0040] Working principle: The user inputs a control instruction through the external control module 301; The control module 301 outputs a signal to make the drive motor 202 operate; During the movement, the sensor 302 detects the distance from obstacles in the moving direction; The sensor 302 transmits the distance signal back to the control module 301; When the distance reaches a certain set value, the control module 301 outputs a signal to control the drive motor 202 to decelerate. When the moving shelf module 200 contacts the adjacent shelf module 200, the control module 301 outputs a signal to control the drive motor 202 to slowly reverse and then quickly stop rotating.

[0041] Furthermore, the sensor 302 is connected to the shelf group 201 at the edge. By arranging the sensor 302 on the shelf group 201 at the edge, a smaller number of sensors 302 can be used to achieve more comprehensive detection.

[0042] In some embodiments, the lower edges on the left and right sides of the U-shaped square tube 2031 extend outward with first extension plates 20311. Fixed baffles 2034 are provided at the front and rear ends of the U-shaped square tube 2031. The fixed baffles 2034 include vertically arranged side plates 20341, upper plates 20342, and lower plates 20343. The upper plates 20342 are connected to the tops of the side plates 20341, and the lower plates 20343 are connected to the bottoms of the side plates 20341. The U-shaped square tube 2031 is located between the upper plate 20342 and the lower plate 20343. The upper plate 20342 is pressed against the top surface of the end of the U-shaped square tube 2031, and the lower plate 20343 receives the end of the U-shaped square tube 2031 and the first extension plate 20311.

[0043] By connecting and fixing the baffle plates 2034 at the front and rear ends of the U-shaped square tube 2031, firstly, it can prevent larger foreign objects from entering between the ground rail 100 and the U-shaped square tube 2031. Secondly, by extending the lower edge of the U-shaped square tube 2031 outward to form the first extension plate 20311, and connecting the baffle plates 2034 to the upper and lower end faces of the U-shaped square tube 2031, the load-bearing capacity of the supporting beam 203 can be enhanced.

[0044] Furthermore, a number of uniformly distributed support columns 2035 are connected to the side wall of the U-shaped square tube 2031. The support columns 2035 are arranged at the edge of the notch of the U-shaped square tube 2031 and are used to improve the anti-deformation ability of the U-shaped square tube 2031, so that the supporting beam 203 made of the U-shaped square tube 2031 can bear a heavier weight.

[0045] Even further, a support clamping plate 2036 is arranged inside the U-shaped square tube 2031, and the support clamping plate 2036 is connected to the inner walls of both sides and the top inner wall of the U-shaped square tube 2031 at the same time. The support clamping plate 2036 is a rectangular thin plate member, and its thickness extends in the front-rear direction. By such a setting, the load-bearing capacity of the supporting beam 203 can be further improved.

[0046] In addition, since when the shelf is connected to the U-shaped square tube 2031, the support feet of the shelf are connected to the U-shaped square tube 2031, the support clamping plate 2036 can be arranged below the support feet of the shelf, so that the load-bearing capacity of the U-shaped square tube 2031 can be improved with a smaller number of the support clamping plates 2036.

[0047] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A movable shelf, characterized in that, Comprising: Floor rails (100), with a number of the floor rails (100) being distributed in parallel and at uniform intervals; Shelving modules (200), the shelving modules (200) including a number of connected shelving units (201), a number of supporting beams (203), drive motors (202), and connecting rods (204). The supporting beams (203) are arranged on the floor rails (100) through driving wheels (2032) and driven wheels (2033). Each supporting beam (203) is connected to one of the floor rails (100) respectively, and the supporting beams (203) are arranged parallel to the floor rails (100). The driving wheels (2032) on adjacent supporting beams (203) are connected by the connecting rods (204). The drive motor (202) is connected to any one of the supporting beams (203), and the drive motor (202) is in transmission connection with the driving wheel (2032) of the supporting beam (203) where it is located to drive the supporting beam (203) to move along the extending direction of the floor rail (100). The lower part of the shelving unit (201) is connected to two adjacent supporting beams (203), and the adjacent edges of adjacent shelving units (201) are located on the same supporting beam (203); Taking the extending direction of the floor rail (100) as the front - back direction, a number of the shelving modules (200) are arranged in sequence front - to - back on the floor rail (100).

2. The movable shelf according to claim 1, characterized in that: The drive motor (202) is arranged on the middle supporting beam (203) among a number of the supporting beams (203).

3. The movable shelf according to claim 2, wherein: The drive motor (202) has a first output shaft and a second output shaft with coaxial output. The first output shaft is arranged on the opposite side of the second output shaft. The first output shaft is connected to the driving wheel (2032), and the second output shaft is connected to the connecting rod (204) and is connected to the driving wheels (2032) on the supporting beams (203) on the opposite side through the connecting rod (204).

4. The movable shelf according to claim 1, characterized in that: It further includes an induction module (300). The induction module (300) includes a control module (301) and sensors (302). The sensors (302) are connected to the shelving module (200), the sensors (302) are electrically connected to the control module (301), the control module (301) is electrically connected to the drive motor (202), and the control module (301) is arranged outside the shelving module (200).

5. The movable shelf according to claim 1, characterized in that: The shelving unit (201) includes two shelves (2011) arranged front - to - back.

6. The movable shelf according to claim 1, characterized in that: The supporting beam (203) is a U - shaped square tube (2031). The notch of the U - shaped square tube (2031) faces downward. The driving wheel (2032) and the driven wheel (2033) are both arranged inside the notch of the U - shaped square tube (2031) and are rotatably connected to the two side walls of the U - shaped square tube (2031).

7. The movable shelf according to claim 6, wherein: The lower edges on both the left and right sides of the U-shaped square tube (2031) extend outward to form first extension plates (20311). Fixed baffles (2034) are provided at the front and rear ends of the U-shaped square tube (2031). The fixed baffles (2034) include vertically arranged side plates (20341), upper plates (20342), and lower plates (20343). The upper plates (20342) are connected to the tops of the side plates (20341), and the lower plates (20343) are connected to the bottoms of the side plates (20341). The U-shaped square tube (2031) is located between the upper plates (20342) and the lower plates (20343). The upper plates (20342) are pressed against the top surfaces of the ends of the U-shaped square tube (2031), and the lower plates (20343) support the ends of the U-shaped square tube (2031) and the first extension plates (20311).

8. The movable shelf according to claim 6, characterized in that: A number of uniformly distributed support columns (2035) are connected to the side walls of the U-shaped square tube (2031).

9. The movable shelf according to claim 6, wherein: A support clamping plate (2036) is provided inside the U-shaped square tube (2031). The support clamping plate (2036) is a thin sheet member and is connected to both the inner side walls and the top inner wall of the U-shaped square tube (2031) simultaneously.

10. The movable shelf according to claim 1, wherein: Flange couplings (20321) are connected to both sides of the driving wheel (2032).

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