Pipe fitting storage vertical warehouse

Abstract

The utility model relates to the field of pipe fitting prefabrication, and particularly discloses a pipe fitting storage vertical warehouse which comprises a storage frame provided with a plurality of storage layers in the vertical direction and a lifting conveying device arranged on one side of the storage frame. The lifting conveying device comprises two first stand columns oppositely arranged in the first direction, two lifting bases movably arranged on the two first stand columns in the vertical direction, two lifting driving assemblies used for driving the two lifting bases to move correspondingly, and a lifting table connected with the two lifting bases. The vertical pipe storage warehouse further comprises two detection assemblies used for detecting the positions of the two lifting bases in the vertical direction and a control unit electrically connected with the two lifting driving assemblies and the two detection assemblies. The control unit can control at least one lifting driving assembly according to the position information, detected by the two detection assemblies, of the two lifting bases, so that the lifting table is kept horizontal.

Description

Technical Field

[0001] The utility model relates to the field of pipe fitting prefabrication processing, in particular to a pipe fitting storage vertical warehouse. Background Art

[0002] The existing pipe storage warehouse includes a storage rack for storing pipes and a lifting platform provided on one side of the storage rack for conveying pipes. In order to accurately store the pipes in multiple storage layers arranged in the up and down directions on the storage rack, it is necessary to accurately control the height of the lifting platform. When the length of the lifting platform is too long, some slight errors may cause the heights of both ends of the lifting platform to be inconsistent, thereby affecting the conveying of the pipes by the lifting platform. Utility Model Content

[0003] The utility model aims to provide a vertical warehouse for storing pipe fittings, which enables a lifting platform to maintain horizontality.

[0004] To achieve the above-mentioned purpose, the utility model proposes a pipe storage warehouse, including a storage rack with multiple storage layers in the up-down direction, and a lifting and conveying device arranged on one side of the storage rack, the lifting and conveying device including two first columns arranged relatively to each other in a first direction, two lifting seats movably arranged in the up-down direction on the two first columns respectively, two lifting drive components respectively used to drive the two lifting seats to move, and a lifting platform connecting the two lifting seats, the pipe storage warehouse also includes two groups of detection components respectively used to detect the positions of the two lifting seats in the up-down direction, and a control unit electrically connected to the two lifting drive components and the two groups of detection components, the control unit is used to control at least one lifting drive component according to the position information of the two lifting seats detected by the two groups of detection components, so as to keep the lifting platform level.

[0005] As a further improvement of the present invention, the detection component includes a plurality of identification marks arranged on the first column and arranged in the up-down direction, and a visual recognition device connected to the lifting seat for identifying the identification marks, and the visual recognition device is electrically connected to the control unit.

[0006] As a further improvement of the utility model, the lifting seat includes a seat body, a roller rotatably connected to the seat body, the roller is in rolling contact with the first column, and the visual recognition device is connected to the seat body.

[0007] As a further improvement of the present invention, the two lifting drive assemblies each include a first rotating shaft and a second rotating shaft respectively arranged on the upper and lower sides of the first column, a first transmission wheel and a second transmission wheel respectively coaxially connected to the first rotating shaft and the second rotating shaft, a transmission member connecting the first transmission wheel and the second transmission wheel, and a motor assembly for driving the first rotating shaft or the second rotating shaft to rotate, the two lifting seats are respectively connected to the transmission members in the two lifting drive assemblies, and the motor assembly is electrically connected to the control unit.

[0008] As a further improvement of the present invention, the first transmission wheel and the second transmission wheel are both sprockets, and the transmission member is a chain. In each of the lifting drive components, at least two first transmission wheels and second transmission wheels are arranged side by side, the number of first transmission wheels and second transmission wheels is the same and they are arranged one by one in the up and down directions, and the corresponding first transmission wheels are both transmission-connected with one of the transmission members.

[0009] As a further improvement of the present invention, the lifting platform includes a crossbeam whose two ends are respectively connected to the two lifting seats, a first connecting shaft and a second connecting shaft extending along a first direction and rotatably connected to the crossbeam, a first driving assembly for driving the first connecting shaft to rotate, a second driving assembly for driving the second connecting shaft to rotate, a material moving rod connected to the first connecting shaft for moving the pipe onto the lifting platform, and a material stopping rod connected to the second connecting shaft for controlling whether the pipe can leave the lifting platform, and the material moving rod and the material stopping rod are respectively located on both sides of the second direction.

[0010] As a further improvement of the present invention, the lifting and conveying device also includes a brake disc connected to the first rotating shaft or the second rotating shaft, and a brake arranged on one side of the brake disc in a radial direction to brake the brake disc.

[0011] As a further improvement of the present invention, the brake disc is connected to the first rotating shaft, and the output end of the motor assembly is connected to the second rotating shaft.

[0012] As a further improvement of the present invention, the storage rack also includes a plurality of second columns, which are respectively arranged on both sides of the first direction, and the first column and the second column located on the same side in the first direction are arranged at intervals along the second direction. The storage rack also includes a connecting beam connecting the first column and the second column located on the same side, and a plurality of material loading platforms connected to the plurality of second columns. The plurality of material loading platforms are arranged at intervals along the up and down directions, and the storage layer is formed between two adjacent material loading platforms and above the topmost material loading platform.

[0013] As a further improvement of the present invention, two lifting and conveying devices are provided, and the two lifting and conveying devices are respectively arranged on both sides of the storage rack in the second direction.

[0014] Beneficial effects of the utility model:

[0015] The utility model provides a pipe fitting storage vertical warehouse, and the control unit can accurately control the height of the lifting platform to achieve automatic storage of the pipe fittings, and can also keep the lifting platform level. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a pipe storage warehouse provided in one embodiment of the utility model;

[0017] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0018] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0019] Figure 4 for Figure 1 The enlarged schematic diagram of point C in the middle;

[0020] Figure 5 for Figure 1 Schematic diagram of the structure of the middle lifting platform;

[0021] Figure 6 for Figure 4 Schematic diagram of the structure of the brake.

[0022] In the figure:

[0023] 100. Vertical warehouse for pipe fittings storage;

[0024] 10. Lifting and conveying device;

[0025] 1. The first column;

[0026] 2. Lifting seat; 21. Seat body; 22. Roller;

[0027] 3. Lifting drive assembly; 31. First rotating shaft; 32. Second rotating shaft; 33. First transmission wheel; 34. Second transmission wheel; 35. Transmission member; 36. Motor assembly; 361. Servo motor; 362. Speed ​​reducer;

[0028] 4. Lifting platform; 41. Crossbeam; 42. First connecting shaft; 43. Second connecting shaft; 44. First driving assembly; 45. Second driving assembly; 46. Material shifting rod; 47. Material blocking rod;

[0029] 5. Detection component; 51. Visual recognition device;

[0030] 6. Brake disc;

[0031] 7. brake; 71. brake body; 72. caliper arm; 73. brake cylinder;

[0032] 20. Storage rack; 201. Second column; 202. Connecting beam; 203. Material placement platform. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0034] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0035] like Figure 1-6 As shown, one embodiment of the utility model provides a pipe storage warehouse 100, which includes a storage rack 20 with multiple storage layers in the up-down direction and a lifting and conveying device 10 provided on one side of the storage rack 20. The lifting and conveying device 10 is used to convey pipes to multiple storage layers of the storage rack 20, or to take pipes out of multiple storage layers. For the convenience of description, Figure 1 The first direction and the second direction which are perpendicular to each other are shown in FIG. The first direction can be understood as the length direction of the pipe storage warehouse 100, and the second direction can be understood as the width direction of the pipe storage warehouse 100. In addition, it should be noted that Figure 2-4 For interception Figure 1 The partial enlarged picture of A, B, and C in the figure. Although A, B, and C are Figure 1 Different parts of Figure 2-4 The structures of the lifting and conveying devices 10 shown in each figure are regarded as the structures in the same lifting and conveying device 10.

[0036] The lifting and conveying device 10 includes two first columns 1 arranged relatively to each other along a first direction, two lifting seats 2 movably arranged on the two first columns 1 along the up and down directions, two lifting drive components 3 respectively used to drive the two lifting seats 2 to move, and a lifting platform 4 connected to the two lifting seats 2. The lifting platform 4 is used to convey pipes. The two lifting drive components 3 respectively drive the two lifting seats 2 to move up and down. The up and down movement of the two lifting seats 2 can drive the lifting platform 4 to move up and down.

[0037] The lifting platform 4 has a length extending along the first direction. When the length of the lifting platform 4 is too long (for example, more than 6m), some slight errors may cause the heights of the two ends of the length of the lifting platform 4 to be inconsistent, thereby affecting the transportation of the pipes by the lifting platform 4. To solve the above problem, in this embodiment, the pipe storage warehouse 100 also includes two sets of detection components 5 for detecting the positions of the two lifting seats 2 in the up and down directions, and a control unit (not shown in the figure) electrically connected to the two lifting drive components 3 and the two sets of detection components 5. The control unit controls the two lifting drive components 3 according to the position information of the two lifting seats 2 in the up and down directions (that is, the heights of the two lifting seats 2) detected by the two detection components 5, so that the lifting seats 2 accurately stay at the specified height, and when the heights of the two lifting seats 2 are inconsistent, the control unit controls at least one lifting drive component 3 so that the lifting drive component 3 drives at least one lifting seat 2 to move up and down, so as to adjust the two lifting seats 2 to the same height, so that the lifting platform 4 remains horizontal.

[0038] In this embodiment, the detection assembly 5 includes a plurality of marks (not shown in the figure) arranged on the first column 1 and arranged in the vertical direction, and a visual recognition device 51 connected to the lifting seat 2 for identifying the marks. The marks are patterns with visual characteristics. The visual recognition device 51 is electrically connected to the control unit. The height information of the plurality of marks is stored in the control unit. When the visual recognition device 51 recognizes a certain mark, the control unit can determine the height information of the lifting seat 2 connected to the visual recognition device 51. In this embodiment, the mark is preferably a two-dimensional code, and the visual recognition device 51 is preferably an optical code reader.

[0039] In other embodiments, the detection component 5 may also be a distance sensor or other component that can detect the height position of the lifting base 2, which is not limited here.

[0040] In this embodiment, the lifting seat 2 includes a seat body 21, a roller 22 rotatably connected to the seat body 21, and the visual recognition device 51 is connected to the seat body 21 to move up and down with the seat body 21. The roller 22 is in rolling contact with the first column 1, which can reduce the friction between the lifting seat 2 and the first column 1. Specifically, a plurality of rollers 22 can be provided, so that the lifting seat 2 can move smoothly along the first column 1.

[0041] The two lifting drive assemblies 3 each include a first rotating shaft 31 and a second rotating shaft 32 respectively arranged at the upper and lower sides of the first column 1, a first transmission wheel 33 and a second transmission wheel 34 respectively coaxially connected to the first rotating shaft 31 and the second rotating shaft 32, a transmission member 35 connecting the first transmission wheel 33 and the second transmission wheel 34, and a motor assembly 36 for driving the first rotating shaft 31 or the second rotating shaft 32 to rotate. The two lifting drive assemblies 3 are respectively arranged at the two first columns 1, and the two lifting seats 2 are respectively connected to the transmission members 35 in the two lifting drive assemblies 3. The motor assembly 36 is electrically connected to the control unit.

[0042] The first transmission wheel 33 is synchronously rotated with the first rotating shaft 31, and the second transmission wheel 34 is synchronously rotated with the second rotating shaft 32. When the motor assembly 36 drives the second rotating shaft 32 to rotate, the second transmission wheel 34 rotates accordingly, and under the action of the transmission member 35, the first transmission wheel 33 also rotates accordingly. When the transmission member 35 transmits between the first transmission wheel 33 and the second transmission wheel 34, it drives the lifting seat 2 connected thereto to move up and down. The first rotating shaft 31 and the second rotating shaft 32 can be specifically supported by bearings for rotation. It can be imagined that when the motor assembly 36 changes to drive the first rotating shaft 31 to rotate, it can also drive the lifting seat 2 to move up and down.

[0043] The motor assembly 36 includes a servo motor 361 and a reducer 362. The output end of the servo motor 361 is connected to the input end of the reducer 362. The output end of the reducer 362 is connected to one of the first rotating shaft 31 or the second rotating shaft 32 as the output end of the motor assembly 36. The servo motor 361 has a high motion accuracy so as to accurately control the up and down position of the lifting seat 2. The reducer 362 can increase the torque of the servo motor 361. The servo motor 361 has a brake function so as to control the lifting seat 2 to stay at a specified height.

[0044] In this embodiment, the first transmission wheel 33 and the second transmission wheel 34 are both sprocket wheels, and the transmission member 35 is correspondingly a chain. In each lifting drive assembly 3, at least two first transmission wheels 33 and second transmission wheels 34 are arranged side by side, and the number of first transmission wheels 33 and second transmission wheels 34 is the same and they are arranged one by one in the up and down direction. The corresponding first transmission wheels 33 and second transmission wheels 34 are connected to each other by transmission. One transmission member 35. In this example, the specific number of the first transmission wheels 33 and the second transmission wheels 34 in each lifting drive assembly 3 is two, and two transmission members 35 are correspondingly provided. Two transmission members 35 can increase the carrying capacity of the lifting drive assembly 3 and avoid the risk of the transmission member 35 breaking when a single transmission member 35 is provided. In some cases, an anti-falling device can also be provided between the lifting seat 2 and the first column 1 to prevent the lifting seat 2 from falling when the transmission member 35 breaks.

[0045] In other embodiments, the first transmission wheel 33 and the second transmission wheel 34 may both be toothed belt wheels, and the transmission member 35 may be a toothed belt correspondingly.

[0046] In this embodiment, the lifting platform 4 includes a crossbeam 41 whose two ends are respectively connected to the two lifting seats 2, a first connecting shaft 42 and a second connecting shaft 43 extending along the first direction and rotatably connected to the crossbeam 41, a first driving component 44 for driving the first connecting shaft 42 to rotate, a second driving component 45 for driving the second connecting shaft 43 to rotate, a material-moving rod 46 connected to the first connecting shaft 42, and a material-blocking rod 47 connected to the second connecting shaft 43. The material-moving rod 46 and the material-blocking rod 47 are respectively located on both sides of the second direction. The first driving component 44 drives the first connecting shaft 42 to rotate, so that the material-moving rod 46 can move the pipe fittings onto the lifting platform 4, and the second driving component 45 drives the second connecting shaft 43 to rotate, so as to control whether the pipe fittings can leave the lifting platform 4.

[0047] In other embodiments, the lifting platform 4 can also be used only to carry pipes, and the pipes are placed on the lifting platform 4 by hoisting or transporting. The pipe storage warehouse 100 also includes a material transfer mechanism for moving pipes from the lifting platform 4 to the storage layer and moving pipes from the storage layer to the lifting platform 4.

[0048] When the lifting and conveying device 10 is in use, the motor assembly 3 needs to overcome gravity to keep the lifting seat 2 at a specified height (in this embodiment, this can be achieved by the brake function of the servo motor 361), so that the lifting platform 4 connected to the lifting seat 2 can receive the pipe at the specified height. However, the moment a heavy pipe is placed on the lifting platform 4, it will cause a large impact on the lifting platform 4, so that the motor assembly 3 cannot keep the lifting seat 2 at the specified height. To solve the above problem, the lifting and conveying device 10 also includes a brake disc 6 connected to the first rotating shaft 31 or the second rotating shaft 32, and a brake 7 provided on one side of the brake disc 6 in the radial direction to brake the brake disc 6.

[0049] As a preferred solution of this embodiment, the brake disc 6 is connected to the first rotating shaft 31, the output end of the motor assembly 36 is connected to the second rotating shaft 32, and the brake disc 6 and the motor assembly 36 are connected to different rotating shafts, so that the structure of the lifting and conveying device 10 is dispersed and the layout is more reasonable. The first rotating shaft 31 is located above the second rotating shaft 32.

[0050] The brake disc 6 is arranged to rotate synchronously with the first rotating shaft 31. Before the material is placed on the lifting platform 4, the brake 7 brakes the brake disc 6, so that the first rotating shaft 31 is locked and cannot rotate, and the position of the lifting seat 2 is also locked. In this way, the problem that the motor assembly 3 cannot keep the lifting seat 2 at a specified height due to excessive impact force when the pipe is placed on the lifting platform 4 can be avoided. After the pipe is placed stably, the brake is released to allow the lifting seat 2 to continue to move.

[0051] In this embodiment, the brake 7 is a pneumatic driver, which determines whether to brake the brake disc 6 by pneumatic drive. The lifting and conveying device 10 also includes an air source, a pipeline that can connect the air source and the brake 7, and a solenoid valve arranged on the pipeline. The solenoid valve is electrically connected to the control unit. The control unit is used to control whether the solenoid valve is energized. The solenoid valve is configured to connect the brake 7 and the air source when energized, and disconnect the brake 7 and the air source when the power is lost. The brake 7 is configured not to brake the brake disc 6 when connected to the air source, and to brake the brake disc 6 when disconnected from the air source.

[0052] With the above arrangement, the control unit can control whether the brake 7 brakes the brake disc 6 by controlling whether the solenoid valve is energized. And when the motor assembly 36 and the control unit are powered by the same power supply, in the event of a sudden power failure, the brake 7 brakes the brake disc 6 to prevent the lifting seat 2 from falling, thereby playing a protective role.

[0053] The brake 7 includes a brake body 71, a pair of clamp arms 72 rotatably connected to the brake body, and a brake cylinder 73 connected to the pair of clamp arms 72. The brake cylinder 73 is connected to the air source through a pipeline and can be switched on and off. The pair of clamp arms 72 has an open state when the brake cylinder 73 is connected to the air source and a braking state when the brake cylinder 73 is disconnected from the air source. When the pair of clamp arms 72 is in the open state, the brake disc 6 can rotate freely; when the pair of clamp arms 72 is in the braking state, the brake disc 6 is clamped so that the brake disc 6 cannot rotate.

[0054] It should be noted that the brake 7 can also be set as other structures, as long as it can clamp the brake disc 6 for braking.

[0055] In this embodiment, at least part of the brake disc 6 is exposed to the outside, so as to visually observe whether the brake disc 6 is worn to a certain extent. When the wear reaches a certain extent, the brake disc 6 needs to be replaced in time. A brake 7 is provided on both sides of the brake disc 6 in the radial direction. The two brakes 7 make the braking of the brake disc 6 more effective.

[0056] In this embodiment, the storage rack 20 also includes a plurality of second columns 201, and the plurality of second columns 201 are respectively arranged on both sides of the first direction, and the first column 1 and the second column 201 located on the same side in the first direction are arranged at intervals along the second direction. The storage rack 20 also includes a connecting beam 202 connecting the first column 1 and the second column 201 located on the same side, and a plurality of material loading platforms 203 connected to the plurality of second columns 201. The plurality of material loading platforms 203 are arranged at intervals along the up and down directions, and a storage layer is formed between two adjacent material loading platforms 203 and above the topmost material loading platform 203. The above arrangement is adopted, so that the storage rack 20 and the lifting and conveying device 10 are connected as a whole.

[0057] There are two lifting and conveying devices 10, and the two lifting and conveying devices 10 are respectively arranged on both sides of the storage rack 20 in the second direction. Specifically, one of the two lifting and conveying devices 10 can be configured to store the pipes in the storage layer, and the other can be configured to take the pipes out of the storage layer. It can be imagined that when there is a lifting and conveying device 10 on both sides of the storage rack 20 in the second direction, the storage rack 20 is provided with two first columns 1 arranged opposite to each other along the first direction on both sides of the second direction.

[0058] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0059] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A pipe storage warehouse, comprising a storage rack with multiple storage layers in the vertical direction, a lifting and conveying device arranged on one side of the storage rack, the lifting and conveying device comprising two first columns arranged opposite to each other in a first direction, two lifting seats movably arranged in the vertical direction on the two first columns, two lifting drive components respectively used to drive the two lifting seats to move, and a lifting platform connecting the two lifting seats, characterized in that: The pipe storage warehouse also includes two groups of detection components for detecting the positions of the two lifting seats in the up and down directions respectively, and a control unit electrically connected to the two lifting drive components and the two groups of detection components. The control unit is used to control at least one lifting drive component according to the position information of the two lifting seats detected by the two groups of detection components to keep the lifting platform level.

2. The pipe storage warehouse according to claim 1 is characterized in that: The detection assembly includes a plurality of marks arranged on the first column and arranged in the up-down direction, and a visual recognition device connected to the lifting seat for identifying the marks, and the visual recognition device is electrically connected to the control unit.

3. The pipe storage warehouse according to claim 2 is characterized in that: The lifting seat comprises a seat body, a roller rotatably connected to the seat body, the roller is in rolling contact with the first column, and the visual recognition device is connected to the seat body.

4. The pipe storage warehouse according to claim 1 is characterized in that: The two lifting drive assemblies each include a first rotating shaft and a second rotating shaft respectively arranged on the upper and lower sides of the first column, a first transmission wheel and a second transmission wheel respectively coaxially connected to the first rotating shaft and the second rotating shaft, a transmission member connecting the first transmission wheel and the second transmission wheel, and a motor assembly for driving the first rotating shaft or the second rotating shaft to rotate. The two lifting seats are respectively connected to the transmission members in the two lifting drive assemblies, and the motor assembly is electrically connected to the control unit.

5. The pipe storage warehouse according to claim 4 is characterized in that: The first transmission wheel and the second transmission wheel are both sprockets, and the transmission member is a chain. In each of the lifting drive components, at least two first transmission wheels and second transmission wheels are arranged side by side, the number of first transmission wheels and second transmission wheels is the same and they are arranged one by one in the up and down directions, and the corresponding first transmission wheels are both transmission-connected with one of the transmission members.

6. The pipe storage warehouse according to claim 1 is characterized in that: The lifting platform includes a crossbeam whose two ends are respectively connected to the two lifting seats, a first connecting shaft and a second connecting shaft extending along a first direction and rotatably connected to the crossbeam, a first driving component for driving the first connecting shaft to rotate, a second driving component for driving the second connecting shaft to rotate, a material moving rod connected to the first connecting shaft for moving the pipe onto the lifting platform, and a material stopping rod connected to the second connecting shaft for controlling whether the pipe can leave the lifting platform, wherein the material moving rod and the material stopping rod are respectively located on both sides of the second direction.

7. The pipe storage warehouse according to claim 4 is characterized in that: The lifting and conveying device also includes a brake disc connected to the first rotating shaft or the second rotating shaft, and a brake arranged on one side of the brake disc in a radial direction to brake the brake disc.

8. The pipe storage warehouse according to claim 7 is characterized in that: The brake disc is connected to the first rotating shaft, and the output end of the motor assembly is connected to the second rotating shaft.

9. The pipe storage warehouse according to claim 1, characterized in that: The storage rack also includes a plurality of second columns, which are respectively arranged on both sides of the first direction, and the first columns and the second columns located on the same side in the first direction are arranged at intervals along the second direction. The storage rack also includes a connecting beam connecting the first columns and the second columns located on the same side, and a plurality of material loading platforms connected to the plurality of second columns, and the plurality of material loading platforms are arranged at intervals along the up and down directions, and the storage layer is formed between two adjacent material loading platforms and above the topmost material loading platform.

10. The pipe storage warehouse according to claim 1, characterized in that: The two lifting and conveying devices are provided, and the two lifting and conveying devices are respectively arranged on both sides of the storage rack in the second direction.

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