CN213834401U

CN213834401U - Warehouse-in and warehouse-out tray limiting mechanism

Info

Publication number: CN213834401U
Application number: CN202022445598.9U
Authority: CN
Inventors: 程湘; 徐龙平
Original assignee: Guangzhou Longtu Intelligent Technology Co ltd
Current assignee: Guangzhou Longtu Intelligent Technology Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-07-30
Anticipated expiration: 2030-10-28

Abstract

The utility model discloses a warehouse-in and warehouse-out tray limiting mechanism, which comprises two racks, wherein the two racks are connected through a rack supporting beam, the rack supporting beam is provided with two shuttle rails and a female tray, and the female tray is positioned above the two shuttle rails; the two sides of the female tray are respectively provided with a female tray limiting push plate, the female tray limiting push plates are driven to move relatively by a first driving device, the child tray limiting push plates are arranged above the female tray limiting push plates, and the child tray limiting push plates are driven to move relatively by a second driving device. The utility model discloses can be fixed and automatic spacing to female tray and son tray respectively through the spacing push pedal of female tray and the spacing push pedal of son tray that correspond, avoided the goods that manual operation error leads to empty, also improved warehouse entry efficiency simultaneously, can also make fork truck directly connect the delivery through this spacing mechanism, optimized traditional conveying equipment's the mode of plugging into, reduce conveying equipment input cost.

Description

Warehouse-in and warehouse-out tray limiting mechanism

Technical Field

The utility model relates to a mechanical automation technical field, concretely relates to warehouse entry and exit tray stop gear.

Background

The three-dimensional warehouse is also called an elevated warehouse or an elevated warehouse, and generally refers to a warehouse which stores unit goods by using shelves with the heights of several layers, more than ten layers or even dozens of layers and uses corresponding material handling equipment to carry out goods warehousing and ex-warehouse operation.

At present, the common warehouse entry and exit modes in the market mainly include a manual correction mode or an automatic connection mode. Wherein, when adopting artifical correction mode, the transfer chain both sides adopt to install fixed stop's mode additional and carry on spacingly, and the space requirement of reserving to the tray both sides is higher, and artifical very difficult accurate putting is put goods, and the goods also has the risk of being emptyd simultaneously. When the automatic connection mode is adopted, WCS and WMS communication need to be carried out between the AGV dollies, the management difficulty is increased, more AGV dollies need to be invested when the warehouse is accessed more, the project construction cost is increased, and the man-machine hybrid operation possesses certain safety risk.

Therefore, a tray limiting mechanism arranged at the connection position of the warehouse-in and warehouse-out ports of the three-dimensional warehouse is needed to be provided, so that the traditional forklift can be adopted for accurate goods placement, the requirement of warehouse-in and warehouse-out can be effectively met, and the construction cost and the safety risk are reduced.

It is noted that this section is intended to provide a background or context to the embodiments of the disclosure that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an discrepancy storehouse tray stop gear to adopt artifical correction mode or AGV dolly to plug into the difficult accurate goods of putting that the mode exists and goods also have the risk of being emptyd and increase the problem that construction cost just possesses certain safe risk when three-dimensional storehouse goes out to put in storage among the solution prior art.

The embodiment of the utility model provides a warehouse-in and warehouse-out tray limiting mechanism, which comprises two racks, wherein the two racks are connected through a rack supporting beam, the rack supporting beam is provided with two shuttle rails and a female tray, and the female tray is positioned above the two shuttle rails;

the two sides of the female tray are respectively provided with a female tray limiting push plate, the female tray limiting push plates are driven to move relatively by a first driving device, the female tray limiting push plates are all provided with a sub-tray limiting push plate above the female tray limiting push plates, and the sub-tray limiting push plates are driven to move relatively by a second driving device.

As the utility model discloses an optimal mode, still be provided with two spacing support frames on the frame supporting beam, spacing support frame top is provided with the spacing push pedal of female tray, spacing support frame bottom is provided with the gyro wheel.

As the utility model discloses an preferred mode, still be provided with two female tray support frames on the frame supporting beam, female tray support frame is located shuttle track with between the spacing support frame, two female tray support frame supports female tray is so that female tray is located two shuttle track top.

As the utility model discloses an preferred mode, two frame stand top is provided with the spacing protection baffle of subtray respectively, two the relative side of the spacing protection baffle of subtray is the slope.

As the utility model discloses an optimal mode, frame upper portion is provided with respectively puts the thing board and puts the thing board down, put and place on the thing board down first drive arrangement, on put and place on the thing board second drive arrangement.

As the utility model discloses an preferred mode, first drive arrangement with second drive arrangement is hydraulic cylinder, hydraulic cylinder's one end with the spacing push pedal of female tray or the spacing push pedal of son tray is connected, and its other end is provided with the hydro-cylinder push rod.

As the utility model discloses an preferred mode still includes that the side is triangle-shaped's fork truck blocks the frame, fork truck blocks the frame and sets up the frame is not in one side of being connected with three-dimensional storehouse warehouse entry/exit mouth.

As the utility model discloses an optimal mode, fork truck blocks that a top is provided with the spacing groove, fork truck blocks to be located on the frame the both sides of spacing groove still are provided with fork truck anticollision board respectively, fork truck blocks that a bottom both sides are provided with the fork truck wheel respectively and blocks the piece.

As a preferred mode of the utility model, a female tray fixing part matched with the female tray is arranged on the female tray limiting push plate, and the female tray fixing part can clamp the side surface of the female tray;

the sub-tray limiting push plate is provided with a sub-tray fixing part matched with the sub-tray, and the sub-tray fixing part can clamp the side face of the sub-tray.

As a preferred mode of the present invention, the rack includes two rack uprights, and the two rack uprights are connected by a rack cross member;

the frame stand bottom is provided with the stand protection foot, frame stand bottom with the junction of stand protection foot still is provided with the reinforcing plate.

The embodiment of the utility model provides an warehouse entry tray stop gear, be applied to three-dimensional warehouse entry port department of plugging into, first drive arrangement and second drive arrangement have been installed additional in frame both sides, thereby can be through the spacing push pedal of the female tray that corresponds and the spacing push pedal of son tray respectively to female tray and son tray fixed and automatic spacing, the goods that has avoided manual operation error to lead to are emptyd, the warehouse entry efficiency has also been improved simultaneously, can also make fork truck directly connect the delivery through this spacing mechanism, the mode of plugging into of traditional conveying equipment has been optimized, reduce conveying equipment input cost.

This limit structure degree of automation is higher, and the reliability is high, has effectively reduced the safety risk.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a tray limiting mechanism for warehouse entry and exit provided in an embodiment of the present invention;

FIG. 2 is another schematic structural view of the warehouse entry tray limiting mechanism shown in FIG. 1;

fig. 3 is a schematic structural view of the warehouse-in and warehouse-out tray limiting mechanism shown in fig. 1 after the machine frame is assembled with the shuttle track, the mother tray supporting frame and the forklift blocking frame;

fig. 4 is a schematic structural diagram of the warehouse-in and warehouse-out tray limiting mechanism shown in fig. 1 after the machine frame is assembled with the shuttle track, the female tray, the limiting support frame, the female tray limiting push plate, the female tray support frame and the first driving device.

The device comprises a frame, 1-1 stand column, 1-2 stand support beams, 1-3 overhead object plates, 1-4 lower object plates, 1-5 stand cross beams, 1-6 stand column protection feet, 1-7 reinforcing plates, and a support frame, wherein the stand column is arranged on the frame;

2. a shuttle track;

3. a mother tray;

4. a mother tray limiting push plate 4-1 and a mother tray fixing part;

5. a first driving device;

6. a sub-tray limiting push plate 6-1 and a sub-tray fixing part;

7. a second driving device;

8. a limiting support frame 8-1 and rollers;

9. a master tray support frame;

10. a sub-tray limiting protection baffle;

11. the forklift truck comprises a forklift truck blocking frame 11-1, a limiting groove 11-2, a forklift truck anti-collision plate 11-3 and a forklift truck wheel blocking block.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Referring to fig. 1-4, the embodiment of the utility model discloses a warehouse-in and warehouse-out tray limiting mechanism, which comprises two frames 1, wherein the two frames 1 are connected through a frame supporting beam 1-2, the frame supporting beam 1-2 is provided with two shuttle tracks 2 and a mother tray 3, and the mother tray 3 is positioned above the two shuttle tracks 2;

the two sides of the female tray 3 are respectively provided with a female tray limiting push plate 4, the female tray limiting push plate 4 drives relative motion through a first driving device 5, the upper part of the female tray limiting push plate 4 is provided with a sub tray limiting push plate 6, and the sub tray limiting push plate 6 drives relative motion through a second driving device 7.

In this embodiment, this warehouse entry tray stop gear sets up in three-dimensional warehouse entry and exit mouth joint department of plugging into, can make fork truck directly connect the delivery through this stop gear, has optimized traditional conveying equipment's the mode of plugging into.

The warehouse-in and warehouse-out tray limiting mechanism mainly comprises two oppositely arranged racks which are connected together through two rack supporting beams. Two opposite shuttle rails are arranged above the rack supporting beam, and the shuttle rails are axially parallel to the rack and have a certain interval, so that the shuttle can convey the female tray to a preset position on the warehouse entering and exiting tray limiting mechanism through the shuttle rails, namely, above the two shuttle rails.

Be provided with the spacing push pedal of female tray respectively in the frame that is located female tray both sides, and its position phase-match that sets up position and female tray, the spacing push pedal of each female tray drives through a drive arrangement respectively to these two spacing push pedals of female tray can relative motion, can fix female tray and realize spacingly.

After the mother tray is limited, the child tray is placed on the mother tray through an operator, and then the child tray is slightly adjusted.

Simultaneously, still be provided with the spacing push pedal of sub-tray in the top of the spacing push pedal of each female tray, and its position of setting matches with the position of placing of the sub-tray that fork truck placed, and the spacing push pedal of each sub-tray drives through second drive arrangement respectively to these two spacing push pedals of sub-tray can relative motion, can fix and realize spacingly to sub-tray.

Therefore, the warehouse-in and warehouse-out tray limiting mechanism is applied to the three-dimensional warehouse-in and warehouse-out port connection position, and the first driving device and the second driving device are additionally arranged on two sides of the rack, so that the mother tray and the son tray can be fixed and automatically limited respectively by the corresponding mother tray limiting push plate and the corresponding son tray limiting push plate.

This stop gear has carried out the effective combination with artifical correction mode and the automatic mode of plugging into, has avoided the goods that manual operation error leads to empty, has also improved warehouse entry efficiency simultaneously, and spacing time only is 8-10 seconds, can also make fork truck directly connect the delivery through this stop gear, has optimized traditional conveying equipment's the mode of plugging into, reduces conveying equipment input cost.

Preferably, a female tray fixing part 4-1 matched with the female tray 3 is arranged on the female tray limiting push plate 4, and the female tray fixing part 4-1 can clamp the side surface of the female tray 3; the sub-tray limiting push plate 6 is provided with a sub-tray fixing part 6-1 matched with the sub-tray, and the sub-tray fixing part 6-1 can clamp the side surface of the sub-tray.

Particularly, a female tray fixing part is arranged on the female tray limiting push plate and can clamp the side face of the female tray.

Under the drive of the first driving device, the two mother tray limiting push plates move relatively until the mother tray fixing parts on the mother tray fixing parts clamp the side faces of the mother trays, so that the two mother tray limiting push plates fix the mother trays and automatically limit the mother trays.

Similarly, a sub-tray fixing part is arranged on the sub-tray limiting push plate, and the sub-tray fixing part can clamp the side surface of the sub-tray.

Under the drive of the second driving device, the two sub-tray limiting push plates move relatively until the sub-tray fixing parts on the two sub-trays clamp the side faces of the sub-trays, so that the two sub-tray limiting push plates fix the sub-trays and automatically limit the sub-trays.

Preferably, the frame support beam 1-2 is further provided with two limiting support frames 8, the top of each limiting support frame 8 is provided with a female tray limiting push plate 4, and the bottom of each limiting support frame 8 is provided with a roller 8-1.

Specifically, two limiting support frames for supporting the limiting push plate of the female tray are arranged on the support beam of the frame and are respectively arranged at the positions between the guide rail of the shuttle car and the frame. The rack supporting beam is of a movable structure, and when the first driving device drives the female tray limiting push plate arranged at the top of the first driving device to move towards the female tray or towards the vertical direction of the female tray, the first driving device can drive the limiting supporting frame to move towards the corresponding direction, so that the female tray is fixed and limited by the female tray limiting push plate.

The bottom of the limiting support frame is also provided with rollers, so that when the limiting support frame moves in the direction perpendicular to the direction of the female tray, namely when the limiting support frame moves in the direction of the axis of the rack, the moving direction of the limiting support frame can be kept from shifting, and the limiting accuracy is ensured.

Preferably, two mother tray support frames 9 are further arranged on the frame support beams 1-2, the mother tray support frames 9 are located between the shuttle rails 2 and the limiting support frames 8, and the two mother tray support frames 9 support the mother trays 3 so that the mother trays 3 are located above the two shuttle rails 2.

Specifically, two primary tray support frames for supporting the primary trays are further arranged on the frame support beam and are respectively arranged at positions between the shuttle track and the limiting support frames. The female tray support frame is made of carbon steel supporting plates with the thickness of 20mm, and can bear more than 500Kg independently, so that the female tray is supported and positioned above the two shuttle rails.

Preferably, the tops of the two stand columns 1-1 are respectively provided with a sub-tray limiting protection baffle 10, and the opposite side surfaces of the two sub-tray limiting protection baffles 10 are slope surfaces.

Specifically, the top of each of the two stand columns is provided with a sub-tray limiting protection baffle, the side surface of each sub-tray limiting protection baffle is of a trapezoidal structure, and two opposite side surfaces of each sub-tray limiting protection baffle are slope surfaces. The inside a plurality of backup pads that still are provided with of sub-tray spacing protection baffle can make the spacing protection baffle of sub-tray have certain intensity.

When operating personnel need place son tray on female tray, at the in-process of son tray whereabouts, the spacing protection baffle of son tray can carry on spacingly to son tray, still can protect the spacing push pedal of son tray of its below simultaneously, prevents that son tray whereabouts in-process from causing the heavy load to damage to the spacing push pedal of son tray.

Preferably, the upper part of the rack 1 is respectively provided with an upper object placing plate 1-3 and a lower object placing plate 1-4, a first driving device 5 is placed on the lower object placing plate 1-4, and a second driving device 7 is placed on the upper object placing plate 1-3.

Specifically, an upper object placing plate and a lower object placing plate are respectively arranged at the upper part of the frame, namely at the position above the frame supporting beam, and are respectively used for arranging a first driving device and a second driving device.

Wherein, place first drive arrangement on putting the thing board down, put the second drive arrangement on putting the thing board on, can correspond with the position of mother's tray or son tray respectively.

Preferably, the first driving device 5 and the second driving device 7 are both hydraulic oil cylinders, one end of each hydraulic oil cylinder is connected with the female tray limiting push plate 4 or the sub-tray limiting push plate 6, and an oil cylinder push rod is arranged at the other end of each hydraulic oil cylinder.

Specifically, the first driving device and the second driving device both adopt hydraulic oil cylinders, one ends of the hydraulic oil cylinders are connected with the limiting push plate of the mother tray or the limiting push plate of the sub tray, and oil cylinder push rods are arranged at the other ends of the hydraulic oil cylinders.

In this embodiment, be located first drive arrangement and the second drive arrangement on the frame of both sides and include two hydraulic cylinder respectively, thrust is enough when can guaranteeing spacing like this, realizes quick spacing to the warehouse entry efficiency has been improved.

Preferably, the three-dimensional garage further comprises a forklift blocking frame 11 with a triangular side face, and the forklift blocking frame 11 is arranged on one side of the machine frame 1, which is not connected with the garage entrance and exit of the three-dimensional garage.

Specifically, this warehouse entry and exit tray stop gear still includes a fork truck and blocks the frame, and it sets up the one side that is not connected with three-dimensional warehouse entry and exit mouth in the frame, one side that the fork truck passed in and out promptly. The side face of the forklift blocking frame is triangular, certain stability is achieved, the forklift can be limited, and the forklift is effectively blocked.

Preferably, the top of the forklift barrier frame 11 is provided with a limiting groove 11-1, two sides of the forklift barrier frame 11, which are located at the limiting groove 11-1, are also respectively provided with a forklift anti-collision plate 11-2, and two sides of the bottom of the forklift barrier frame 11 are respectively provided with a forklift wheel barrier 11-3.

Specifically, fork truck blocks that top intermediate position department of frame is provided with the spacing groove, can press from both sides the whereabouts position of fork in front of the fork truck and carry out spacingly and proofreaies and correct, makes the son tray that the fork pressed from both sides place just in time on mother tray, can also carry out front and back spacing to son tray when operating personnel adjusts the position of son tray simultaneously.

Still be provided with two fork truck anticollision boards on the fork truck barrier frame, these two fork truck anticollision boards are located the both sides of spacing groove respectively, can prevent that fork truck from causing the clashing to fork truck barrier frame when being close to fork truck barrier frame.

Two forklift wheel stop blocks are further arranged on two sides of the bottom of the forklift stop frame respectively, so that the wheels of the forklift can be stopped when the forklift is close to the forklift stop frame, and collision of the forklift stop frame due to the forklift can be further prevented.

Preferably, the rack 1 comprises two rack upright posts 1-1, and the two rack upright posts 1-1 are connected through a rack cross beam 1-5; the bottom of the stand column 1-1 of the frame is provided with a stand column protection foot 1-5, and the joint of the bottom of the stand column 1-1 of the frame and the stand column protection foot 1-5 is also provided with a reinforcing plate 1-6.

Specifically, the frame includes two frame uprights that are connected by an upper and a lower frame cross-member to increase its stability.

The bottom of the stand column of the frame is also provided with the stand column protection feet, so that the contact area with the ground is increased, the stability is further increased on the one hand, and on the other hand, the stand column of the frame can be prevented from damaging the ground in the bearing process. Meanwhile, two reinforcing plates are arranged at the joint of the bottom of the stand column of the frame and the stand column protection foot, so that the stability can be further improved, and the bearing capacity of the stand column is improved.

After the improvement, the rack can bear and push 1.5T goods, and can meet the use requirement.

On the basis of the structure of the above-described embodiment, the operation of the warehouse-in/warehouse-out tray limiting mechanism will be specifically described below.

After an operator drives the forklift to take goods, the primary tray is placed on the two primary tray supporting frames through the shuttle vehicle, and then the first driving device drives the primary tray limiting push plate to fix and limit the primary tray. After the mother pallet is limited, another operator places the child pallet on the mother pallet, slightly adjusts the position of the child pallet, enables the side edge of the child pallet to be close to the forklift blocking frame, and then the forklift places the goods on the child pallet under the blocking and limiting of the forklift blocking frame. After the forklift is driven away, the secondary tray is fixed and limited by the secondary driving device driving the secondary tray limiting push plate. After the sub-tray is limited, the operator can perform the next warehousing operation.

The above process is a warehousing process, and the ex-warehouse process is similar to the warehousing process, and is not described herein again.

To sum up, the embodiment of the utility model provides an warehouse entry tray stop gear is applied to three-dimensional warehouse entry and exit mouth department of plugging into, first drive arrangement and second drive arrangement have been installed additional in frame both sides to can be fixed and automatic spacing to female tray and sub-tray respectively through the spacing push pedal of female tray and the spacing push pedal of sub-tray that correspond, the goods that have avoided manual operation error to lead to are emptyd, the warehouse entry efficiency has also been improved simultaneously, can also make fork truck directly connect the delivery through this spacing mechanism, traditional conveying equipment's the mode of plugging into has been optimized, reduce conveying equipment input cost.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are the directions or positional relationships shown in the drawings, or the directions or positional relationships usually placed when the products of the present invention are used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A warehouse in-out tray limiting mechanism is characterized by comprising two racks, wherein the two racks are connected through a rack supporting beam, two shuttle rails and a female tray are arranged on the rack supporting beam, and the female tray is positioned above the two shuttle rails;

2. The warehouse entry and exit tray limiting mechanism of claim 1, wherein the rack support beam is further provided with two limiting support frames, the top of each limiting support frame is provided with the limiting push plate of the female tray, and the bottom of each limiting support frame is provided with a roller.

3. The warehouse entry and exit tray limiting mechanism of claim 2, wherein two female tray support frames are further disposed on the rack support beams, the female tray support frames being located between the shuttle rails and the limiting support frames, the two female tray support frames supporting the female tray such that the female tray is located above the two shuttle rails.

4. The warehouse entry and exit tray limiting mechanism of claim 1, wherein the tops of the two rack columns are respectively provided with a sub-tray limiting and protecting baffle plate, and the opposite sides of the two sub-tray limiting and protecting baffle plates are slope surfaces.

5. The warehouse entry and exit tray limiting mechanism of claim 1, wherein an upper object placing plate and a lower object placing plate are respectively arranged at the upper part of the rack, the first driving device is placed on the lower object placing plate, and the second driving device is placed on the upper object placing plate.

6. The warehouse entry and exit tray limiting mechanism of claim 5, wherein the first driving device and the second driving device are both hydraulic cylinders, one end of each hydraulic cylinder is connected with the female tray limiting push plate or the sub-tray limiting push plate, and the other end of each hydraulic cylinder is provided with a cylinder push rod.

7. The warehouse entry and exit tray limiting mechanism according to any one of claims 1 to 6, further comprising a forklift blocking frame with triangular side faces, wherein the forklift blocking frame is arranged on one side of the rack which is not connected with the warehouse entry and exit of the three-dimensional warehouse.

8. The warehouse entry and exit tray limiting mechanism of claim 7, wherein a limiting groove is formed in the top of the forklift barrier frame, forklift anti-collision plates are respectively arranged on two sides of the limiting groove on the forklift barrier frame, and forklift wheel blocking blocks are respectively arranged on two sides of the bottom of the forklift barrier frame.

9. The warehouse entry and exit tray limiting mechanism as claimed in claim 1, wherein the female tray limiting push plate is provided with a female tray fixing part matched with the female tray, and the female tray fixing part can clamp the side surface of the female tray;

10. The warehouse entry and exit tray limiting mechanism of claim 1, wherein the rack comprises two rack uprights connected by a rack cross-member;