CN218539167U

CN218539167U - Transport vehicle

Info

Publication number: CN218539167U
Application number: CN202220195874.7U
Authority: CN
Inventors: 王永亮; 陈文成
Original assignee: Multiway Robotics Shenzhen Co Ltd
Current assignee: Multiway Robotics Shenzhen Co Ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2023-02-28
Anticipated expiration: 2032-01-24

Abstract

The utility model provides a carrier, which comprises a shell structure, a first fork and a second fork, wherein the first fork and the second fork are arranged up and down, the first fork can be arranged in a lifting way, the shell structure comprises a shell and a middle shell, the shell comprises two side parts which are arranged oppositely, the front parts and the top parts of the two side parts are arranged at intervals, and the side parts are used for supporting goods; the middle shell is arranged between the two side parts and is respectively connected with the two side parts so as to form a first cavity and a second cavity which are arranged up and down by enclosing with the outer shell; the first fork is arranged in the first cavity, can enter and exit the first cavity from the front openings of the two side parts in a telescopic mode, can go into and exit the first cavity from the top openings of the two side parts in a lifting mode, and the second fork is arranged in the second cavity and can enter and exit the second cavity from the front openings of the two side parts in a telescopic mode. The technical scheme of this application can improve the conveying efficiency and the safety in utilization of carrier, and reduces the occupation space of carrier when idle.

Description

Transport vehicle

Technical Field

The utility model relates to a carrier field, in particular to carrier.

Background

The existing carrier is generally only provided with one fork for forking cargoes, so that the carrying efficiency is low; meanwhile, the pallet fork is directly exposed outside, so that the carrying vehicle occupies a large space when not required to carry, and the pallet fork is easily damaged due to collision.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a carrier aims at improving the conveying efficiency and the safety in utilization of carrier, and reduces the occupation space of carrier when idle.

In order to achieve the above object, the utility model provides a carrier, carrier includes shell structure and the first fork and the second fork of arranging from top to bottom, first fork liftable sets up, shell structure includes:

the shell comprises two oppositely arranged side parts, the front parts and the top parts of the two side parts are arranged at intervals, and the side parts are used for supporting goods; and

the middle shell is arranged between the two side parts and is respectively connected with the two side parts so as to form a first cavity and a second cavity which are vertically arranged by being enclosed with the outer shell;

the first fork is arranged in the first chamber, can be extended and retracted into and out of the first chamber from the front openings of the two side parts, can be lifted and lowered into and out of the first chamber from the top openings of the two side parts, and is arranged in the second chamber, and can be extended and retracted into and out of the second chamber from the front openings of the two side parts.

Optionally, the middle shell comprises:

the mounting plate is arranged between the two side parts and forms an included angle with the two side parts; and

the two connecting parts are convexly arranged on the surface of the mounting plate, and each connecting part is connected with one side part.

Optionally, the side portion comprises:

a first side plate disposed toward the other side portion; and

the first supporting part is arranged on the other side of the first side plate in a protruding mode and can be used for supporting cargoes, and the first supporting part supports the connecting part and is connected with the connecting part.

Optionally, the connecting portion is connected with the first side plate.

Optionally, first supporting part includes along first backup pad and the second backup pad of arranging from top to bottom of shell structure's direction of height and the connecting plate that extends along the direction of height, the connecting plate respectively with first backup pad with the second backup pad is connected, the second backup pad support in connecting portion and with connecting portion connect, first backup pad the second backup pad the connecting plate and the curb plate encloses to close and forms the installation cavity, first backup pad can be used to support the goods.

Optionally, the connecting portion includes:

the top plate is arranged opposite to the mounting plate, is positioned above the mounting plate and is used for supporting the first supporting part; and

the second curb plate, the second curb plate presss from both sides to be located the mounting panel with between the roof, and follow at least part circumference of roof encircles the setting, and respectively with the mounting panel with the roof is connected.

Optionally, the housing further includes a rear cover, and the rear cover is disposed behind the two side portions and connected to the two side portions respectively.

Optionally, the back cover comprises:

the cover plate is respectively connected with the two side parts; and

a third support plate extending from the cover plate to an inner side of the housing and supported by the middle case.

Optionally, the shell structure further includes a second supporting portion, and the second supporting portion is protruded on the upper surface of the middle shell and is used for supporting the cargo.

Optionally, an installation space is formed in the second support portion.

The carrier of the utility model comprises a shell structure, a first fork and a second fork, wherein two side parts of a shell in the shell structure and a middle shell are enclosed to form a first cavity and a second cavity which are arranged up and down, openings are arranged in front of and at the top of the shell, and the first fork and the second fork are respectively arranged in the first cavity and the second cavity; when the carrier does not need to operate, the first fork and the second fork can be retracted into the first cavity and the second cavity respectively, so that the occupied space of the carrier is reduced, the first fork and the second fork are protected, and the first fork and the second fork are prevented from being damaged due to collision of foreign objects when the carrier is idle; when the carrier carries out carrying operation, the first fork and the second fork can extend out of the front opening of the shell to fork goods, the first fork can carry the goods to rise and retract backwards from the top opening to support the goods on the two side parts of the shell so as to avoid the second fork, and the first fork is prevented from obstructing the forking operation of the second fork, so that the carrier can carry the two goods simultaneously, the transportation efficiency of the carrier is improved, and the stability of the carrier in the carrying process is improved by supporting the goods through the shell structure; and the first chamber and the second chamber are separated by the middle shell, so that the first fork can be prevented from colliding with the second fork when the first fork is lifted, and the damage risk is reduced.

Drawings

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

FIG. 1 is a schematic view of an embodiment of a cart according to the present invention;

FIG. 2 is a block diagram of the present invention truck with the first fork removed;

FIG. 3 is a schematic view of an embodiment of the housing of the present invention;

FIG. 4 is an exploded view of the shell structure of the present invention;

figure 5 is a schematic view of the second fork of the truck of the present invention extending to prepare for forking and picking the pallet.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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 belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a carrier 100.

Referring to fig. 1 to 5, in some embodiments of the cart 100 of the present invention, the cart 100 includes a housing structure 10, and a first fork 20 and a second fork 30 arranged up and down, the first fork 20 is arranged in a lifting manner, the housing structure 10 includes an outer shell 11 and a middle shell 12, the outer shell 11 includes two side portions 111 arranged oppositely, the front portion and the top portion of the two side portions 111 are arranged at an interval, and the side portions 111 are used for supporting goods; the middle shell 12 is arranged between the two side portions 111, and is respectively connected with the two side portions 111 to form a first chamber 113 and a second chamber 114 which are arranged up and down with the outer shell 11; the first fork 20 is disposed in the first chamber 113, and can be extended and retracted from the front openings of the two side portions 111 into and out of the first chamber 113, and can be lifted and lowered from the top openings of the two side portions 111 into and out of the first chamber 113, and the second fork 30 is disposed in the second chamber 114, and can be extended and retracted from the front openings of the two side portions 111 into and out of the second chamber 114.

In this embodiment, the housing structure 10 is a mounting base for the first fork 20 and the second fork 30, a receiving cavity for receiving the first fork 20 and the second fork 30 is formed in the housing structure 10, a first opening communicated with the receiving cavity is formed in front of the housing structure 10, so that the first fork 20 and the second fork 30 can penetrate through the first opening and extend forward to reach the fork for taking goods, a second opening communicated with the receiving cavity is formed in the top of the housing structure 10, and the first opening is communicated with the second opening. When the truck 100 begins to transport the cargo, the first fork 20 first extends forward through the first opening to fork the cargo, then lifts the cargo and retracts rearward from the second opening to place the cargo on top of the housing structure 10; the first fork 20 is prevented from interfering and colliding with the second fork 30 during the process that the subsequent second fork 30 extends forward through the first opening to fork the goods, so that the carrier 100 can transport two pallets 200 goods at a time. Similarly, when the cart 100 stops transporting goods, the first fork 20 and the second fork 30 can be retracted into the receiving cavity, so as to protect the first fork 20 and the second fork 30 and reduce the floor space of the cart 100.

Specifically, the housing structure 10 includes an outer shell 11 and a middle shell 12, the outer shell 11 has the aforesaid receiving cavity formed therein, the middle shell 12 is transversely partitioned in the receiving cavity and is connected with two side portions 111 of the outer shell 11 respectively to partition the receiving cavity into a first cavity 113 and a second cavity 114 arranged up and down, the two side portions 111 are used for supporting the goods forked by the first fork 20, wherein the first cavity 113 can be used for installing the first fork 20, the second cavity 114 can be used for installing the second fork 30, and the middle shell 12 partitions the first fork 20 and the second fork 30, so as to avoid the first fork 20 and the second fork 30 from colliding with each other during the lifting process, thereby improving the safety in use.

Therefore, it can be understood that the truck 100 of the present invention includes a shell structure 10, a first fork 20 and a second fork 30, two side portions 111 of a shell 11 in the shell structure 10 and a middle shell 12 enclose to form a first cavity 113 and a second cavity 114 arranged up and down, and both the front and the top of the shell 11 are provided with openings, the first fork 20 and the second fork 30 are respectively disposed in the first cavity 113 and the second cavity 114; when the truck 100 does not need to work, the first fork 20 and the second fork 30 can be retracted into the first cavity 113 and the second cavity 114 respectively, so that the occupied space of the truck 100 is reduced, the first fork 20 and the second fork 30 are protected, and the first fork 20 and the second fork 30 are prevented from being damaged due to collision of foreign objects when the truck 100 is idle; when the truck 100 is used for carrying, the first fork 20 and the second fork 30 can extend out of the front opening of the housing 11 to fork a cargo, and the first fork 20 can lift the cargo and retract backwards from the top opening to support the cargo on the two side portions 111 of the housing 11 to avoid the second fork 30, so that the first fork 20 is prevented from obstructing the forking operation of the second fork 30, the truck 100 can carry two cargoes simultaneously, the transportation efficiency of the truck 100 is improved, and the stability of the cargo during carrying is improved by supporting the cargo through the shell structure 10; and the first chamber 113 and the second chamber 114 are separated by the middle shell 12, so that the first fork 20 can be prevented from colliding with the second fork 30 when being lifted, and the damage risk can be reduced.

Referring to fig. 4, in some embodiments of the cart 100 of the present invention, the middle housing 12 includes a mounting plate 121 and two connecting portions 122, the mounting plate 121 is disposed between the two side portions 111 and forms an included angle with the two side portions 111; the two connecting portions 122 are protruded on the surface of the mounting plate 121, and each connecting portion 122 is connected to one of the side portions 111.

In this embodiment, the middle shell 12 includes a mounting plate 121 and two connecting portions 122 disposed at two sides of the mounting plate 121, and each connecting portion 122 is connected to the side portion 111 of the outer shell 11, so as to improve the connecting area and the connecting strength between the middle shell 12 and the outer shell 11, thereby improving the structural strength of the shell structure 10 of the truck 100, so that the truck 100 can maintain the structural stability when carrying two pallets 200 simultaneously, and improve the carrying capacity of the truck 100.

In some embodiments, the upper surface of the center housing 12 forms a first mounting surface for carrying the first fork 20.

In this embodiment, the upper surface of the middle shell 12 forms a first mounting surface, the first fork 20 is slidably mounted on the first mounting surface, and the middle shell 12 can support the first fork 20 and the goods forked by the first fork 20, so as to improve the stability of the carrier 100 in transporting goods.

With combined reference to fig. 3 and 4, in some embodiments of the guided vehicle 100 of the present invention, the side portion 111 includes a first side plate 1111 and a first supporting portion 1112, the first side plate 1111 is disposed toward the other side portion 111; the first supporting portion 1112 is protruded from the surface of the first side plate 1111 facing the other side portion 111, the first supporting portion 1112 is configured to support the cargo, and the first supporting portion 1112 is supported by the connecting portion 122 and connected to the connecting portion 122.

In this embodiment, the side portion 111 of the housing 11 includes a first side plate 1111 and a first supporting portion 1112, and the two first side plates 1111 disposed opposite to each other in the housing 11 are used for shielding and protecting the inner fork and the control assembly. The first supporting portion 1112 is disposed on an inner side wall of the first side plate 1111 in a protruding manner, and an upper surface of the first supporting portion 1112 is used for carrying goods carried by the first fork 20 when retracting. At this time, the lower surface of the first supporting portion 1112 is supported on the connecting portion 122 to improve the load carrying capacity of the cargo, and prevent the first supporting portion 1112 from being deformed or damaged by pressure.

Further, in some embodiments of the guided vehicle 100 of the present invention, the connecting portion 122 is connected to the first side plate 1111.

In this embodiment, the connecting portion 122 is connected to the first side plate 1111 at the same time, so as to improve the connection strength between the middle shell 12 and the side portion 111, thereby improving the structural strength of the housing structure 10 of the truck 100, so that the truck 100 can maintain the structural stability when carrying two pallets 200 simultaneously, and improve the carrying capacity of the truck 100.

Referring to fig. 3 and 4, in some embodiments of the carrier 100 of the present invention, the first supporting portion 1112 includes a first supporting plate 1112a and a second supporting plate 1112b arranged up and down along a height direction of the housing structure 10 and a connecting plate 1112c extending along the height direction, the connecting plate 1112c is respectively connected to the first supporting plate 1112a and the second supporting plate 1112b, the second supporting plate 1112b is supported by the connecting portion 122 and connected to the connecting portion 122, the first supporting plate 1112a, the second supporting plate 1112b, the connecting plate 1112c and the side plate enclose to form the mounting cavity 131, and the first supporting plate 1112a can be used for supporting goods.

In this embodiment, the middle of the first supporting portion 1112 is hollowed to form the mounting cavity 131, so that the weight of the first supporting portion 1112 can be reduced, the weight borne by the middle shell 12 can be reduced, the middle shell 12 is prevented from being overloaded, and meanwhile, the mounting cavity 131 inside the first supporting portion 1112 can be used for mounting components such as a control assembly or a speaker of the transportation vehicle 100, so as to improve the space utilization rate. Specifically, the first supporting portion 1112 includes a first supporting plate 1112a and a second supporting plate 1112b arranged up and down along the height direction of the housing structure 10, and a connecting plate 1112c extending along the height direction, the connecting plate 1112c is connected to the first supporting plate 1112a and the second supporting plate 1112b respectively, the second supporting plate 1112b is supported by the connecting portion 122 and connected to the connecting portion 122, and the first supporting plate 1112a can be used for supporting goods. The connection plate 1112c is provided to structurally reinforce the first support plate 1112a and prevent the first support plate 1112a from being deformed by pressure. In some embodiments, the connection plate 1112c has a mounting hole for a user to mount or dismount the component in the mounting cavity 131.

Referring to fig. 4, in some embodiments of the transportation vehicle 100 of the present invention, the connecting portion 122 includes a top plate 1221 and a second side plate 1222, the top plate 1221 is disposed opposite to the mounting plate 121 and above the mounting plate 121 for supporting the first supporting portion 1112; the second side plate 1222 is sandwiched between the mounting plate 121 and the top plate 1221, and is disposed around at least a portion of the circumference of the top plate 1221, and is connected to the mounting plate 121 and the top plate 1221, respectively.

In this embodiment, the connecting portion 122 of the middle shell 12 includes a top plate 1221 and a second side plate 1222, the top plate 1221 is disposed opposite to the mounting plate 121, and the supporting surface of the plate-shaped structure is disposed, so that the contact area between the middle shell 12 and the first supporting portion 1112 is increased, and the supporting strength of the middle shell 12 is improved. The second side plate 1222 surrounds along at least a part of the circumference of the top plate 1221, can connect the mounting plate 121 and the top plate 1221, supports the top plate 1221, and can also serve as a reinforcing structure of the top plate 1221, and the second side plate 1222 extends along two adjacent side edges of the top plate 1221, so that the top plate 1221 is prevented from being deformed by pressure, and the structural strength of the connecting portion 122 is improved.

Referring to fig. 2 to 4, in some embodiments of the transportation vehicle 100 of the present invention, the housing 11 further includes a rear cover 112, and the rear cover 112 is disposed behind the two side portions 111 and is connected to the two side portions 111 respectively.

In this embodiment, the housing 11 further includes a rear cover 112, the rear cover 112 is disposed behind the two side portions 111 and respectively connected to the two side portions 111, so that the overall structural stability of the housing 11 can be improved, and the rear opening of the accommodating cavity can be closed to protect the components in the accommodating cavity.

Referring to fig. 3 and 4 in combination, in some embodiments of the transportation vehicle 100 of the present invention, the rear cover 112 includes a cover plate 1121 and a third support plate 1122, and the cover plate 1121 is respectively connected to the two side portions 111; the third support plate 1122 extends from the cover plate 1121 toward the inside of the housing 11, and is supported by the middle case 12.

In this embodiment, the rear cover 112 includes a cover plate 1121 and a third support plate 1122, the cover plate 1121 is disposed at the rear end opening of the housing 11, and the third support plate 1122 extends from the cover plate 1121 to the accommodating cavity and is supported on the middle housing 12; with the arrangement, the supporting strength of the middle shell 12 to the outer shell 11 is further enhanced, and the structural stability and the bearing capacity of the shell structure 10 are improved.

In some embodiments, the mounting plate 121 is provided with a mounting portion 124 protruding thereon, so that the third supporting plate 1122 can be supported on the mounting portion 124 to facilitate the assembly and disassembly of the rear cover 112.

Referring to fig. 1 to 5, in some embodiments of the carrier 100 of the present invention, the housing structure 10 further includes a second supporting portion 13, and the second supporting portion 13 is protruded on an upper surface of the middle shell 12 for supporting goods.

In this embodiment, the housing structure 10 further includes a second supporting portion 13 protruding from the upper surface of the middle shell 12, the second supporting portion 13 extends to the upper end opening of the outer shell 11, and at this time, when the first fork 20 forks the goods and is disposed above the housing structure 10, the second supporting portion 13 can jointly bear the goods on the side portion 111, so as to perform an auxiliary supporting function on the goods, so that the truck 100 is more stable in transporting the goods, and the bearing capacity and the transportation stability of the truck 100 are improved.

Further, in some embodiments of the present disclosure, the second supporting portion 13 has a mounting space 1112d formed therein.

In this embodiment, the hollow-out mounting space 1112d is formed in the middle of the second supporting portion 13, so that the weight of the second supporting portion 13 can be reduced, the weight borne by the middle shell 12 can be reduced, the middle shell 12 can be prevented from being overloaded, and meanwhile, the mounting space 1112d inside the second supporting portion 13 can be used for mounting power components such as a battery or a pump station of the carrier 100, so as to improve the space utilization rate. In addition, a through hole may be further formed on the front sidewall of the second supporting portion 13 for installing a detection camera of the cart 100, so as to realize automatic line identification, automatic obstacle avoidance and automatic distance measurement of the cart 100.

In some embodiments, the mounting groove 123 is concavely disposed on the upper surface of the mounting plate 121 of the middle case 12, the second supporting portion 13 covers the mounting groove 123, and the mounting space 1112d is communicated with the mounting groove 123, so that the volume of the mounting space 1112d can be increased, the mounting groove 123 can also be used for limiting the power assembly such as a battery or a pump station, and the stability of the power assembly such as a battery or a pump station mounted in the mounting space 1112d can be improved.

In some embodiments of the present invention, the bottom plate 14 can be arranged to be lifted.

In this embodiment, the bottom plate 14 can be lifted to lift the second fork 30 mounted on the bottom plate 14. Specifically, the second fork 30 is mounted on the second mounting surface of the bottom plate 14, when the truck 100 needs to transport goods, the driving structure drives the bottom plate 14 to move downwards, so as to drive the second fork 30 to descend, and then the second fork 30 extends forwards through the first opening; so set up, make things convenient for second fork 30 to fork the goods and get, then bottom plate 14 rises with the lifting goods with second fork 30 to make the goods can be carried by carrier 100 and remove, avoid goods removal process and ground friction. Similarly, when the transporting cart 100 stops transporting the goods, the second fork 30 is retracted into the bottom of the housing from the first opening, and then the hydraulic cylinder drives the bottom plate 14 to ascend, so as to drive the second fork 30 to ascend, so that the second fork 30 can be accommodated in the housing 10. Alternatively, the bottom plate 14 first drives the second fork 30 to rise to a certain height, and then the second fork 30 retracts from the first opening, so that the second fork 30 can be accommodated in the housing structure 10.

Referring to fig. 4, in some embodiments of the present disclosure, one of the guide posts 141 and the guide holes 125 is disposed on a surface of the bottom plate 14 facing the middle housing 12, the other of the guide posts 141 and the guide holes 125 is formed on a lower surface of the middle housing 12, and the guide posts 141 are disposed through the guide holes 125.

In this embodiment, the middle shell 12 and the bottom plate 14 are provided with the guide holes 125 and the guide posts 141 penetrating the guide holes 125, so as to guide the bottom plate 14, and realize that the second fork 30 moves along the vertical direction, and further, the second fork 30 is not prone to toppling over or breaking due to the oblique force during transportation.

In some embodiments, the guiding column 141 is protruded from the upper surface of the bottom plate 14, the middle shell 12 is provided with a guiding hole 125, and the transportation vehicle 100 further includes a guiding portion 126 disposed on the upper surface of the middle shell 12, the guiding portion 126 is a cylindrical structure, and covers the guiding hole 125 and is communicated with the guiding hole 125, so that the guiding hole 125 can be extended by the guiding portion 126, the contact area with the guiding column 141 is increased, and the guiding effect on the guiding column 141 is enhanced.

The above is only the optional embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform that the content of the description and the attached drawing was made, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.

Claims

1. The utility model provides a carrier, a serial communication port, carrier includes shell structure and the first fork and the second fork of arranging from top to bottom, first fork liftable sets up, shell structure includes:

the middle shell is arranged between the two side parts and is respectively connected with the two side parts so as to form a first cavity and a second cavity which are arranged up and down by enclosing with the outer shell;

2. The cart of claim 1, wherein said middle housing comprises:

the two connecting parts are arranged on the surface of the mounting plate in a protruding mode, and each connecting part is connected with one side part.

3. The cart of claim 2, wherein said side portion comprises:

a first side plate disposed toward the other side portion; and

4. The cart of claim 3, wherein said connecting portion is connected to said first side plate.

5. The cart of claim 3, wherein said first support portion comprises a first support plate and a second support plate arranged vertically along a height direction of said housing structure and a connecting plate extending along the height direction, said connecting plate being connected to said first support plate and said second support plate, respectively, said second support plate being supported by and connected to said connecting portion, said first support plate, said second support plate, said connecting plate and said side plate enclosing a mounting cavity, said first support plate being adapted to support a load.

6. The cart according to claim 3, wherein said connecting portion comprises:

7. The cart according to claim 1, wherein said housing further comprises a rear cover disposed rearward of said two side portions and connected to said two side portions, respectively.

8. The cart of claim 7, wherein said rear cover comprises:

the cover plate is respectively connected with the two side parts; and

a third support plate extending from the cover plate to an inner side of the case and supported by the middle case.

9. The cart according to any one of claims 1 to 8, wherein said housing structure further comprises a second support portion protruding from an upper surface of said middle housing for supporting a load.

10. The cart of claim 9, wherein a mounting cavity is formed in said second support portion.