JP2020090212A - Cargo transport device - Google Patents

Abstract

To provide a transport device to be used for work of loading cargo into a cargo chamber in a truck and reversely unloading the cargo, that is inexpensive since it is mounted onto the cargo chamber and can be used also at a transport destination, and that increases durability against vibration and the like occurring during vehicle traveling.SOLUTION: A transport device comprises: a conveyor 10 for transporting a cargo W; a loading base 15 for loading the cargo W; and a lift mechanism 12 for elevating the loading base 15 to the lift height above a conveyance surface C of the transporting conveyor 10. Accordingly, a freight vehicle 2 can travel in a state that the cargo W is floated from the conveyance surface C of a chain conveyor for each pallet P.SELECTED DRAWING: Figure 5

Description

The present invention relates to a carrier device used for loading and unloading cargo into a luggage compartment of a freight vehicle, for example.

For example, the following patent document discloses a transporting device for saving labor in loading and unloading a large number of luggage in a luggage compartment or a carrier of a freight vehicle such as a truck. Patent Document 1 discloses a carrying device in which a belt conveyor is mounted on a truck carrier and luggage is carried by the belt conveyor from the rear part of the carrier part to the front part and loaded to the inner part. With this transport device, it is possible to save labor in loading loads from the rear part to the front part of the loading platform.

In Patent Document 2, a trolley equipped with a luggage loading robot that grips and transfers luggage is connected to the tip of a telescopic conveyor, and the trolley is moved forward from the rear of the truck luggage compartment while being transported by the conveyor. Discloses a luggage loading device configured to load the luggage into a luggage compartment by a luggage loading robot. According to this luggage loading device, it is possible to save labor in the loading work from the outside of the loading platform to the back.

JP, 10-739, A JP, 6-92470, A

However, according to the former belt conveyor type transporting device, although it is convenient for loading and unloading a large number of pieces of luggage that are moved together in the luggage compartment at one time, the truck travels while being loaded on the conveyor. When doing so, the vibration of the load may be applied to the transfer conveyor, and the transfer conveyor may be easily damaged. Also, in the latter robot-type loading device, since there is no problem of damage to the transfer conveyor due to traveling because the load is loaded directly onto the loading platform, it is necessary to prepare a separate transfer device when unloading at the transfer destination. However, there is a problem in this respect that causes a large increase in cost.

The present invention relates to a carrier device equipped on a cargo bed of a freight vehicle, which can improve durability against vibrations and the like due to running of the vehicle, and can be mounted in a cargo room and used at a destination as well. The purpose is to provide.

One feature of the present disclosure is a carrier device that is installed in a luggage compartment of a freight vehicle and conveys luggage between an opening and a back portion of the luggage compartment. This conveyor is a conveyor that conveys luggage, a loading platform that loads luggage, and a loading platform that vertically moves the loading platform between an upper lift height and a lower withdrawal height with respect to the conveyor transport surface. It is equipped with a lift mechanism for displacing.

According to the above feature, the load carried by the conveyor to the inner part of the luggage compartment is lifted to the lift height by the loading platform and floated from the carrying surface. It is possible to prevent the cargo from collapsing because the freight vehicle travels while the loaded cargo is floating from the transport surface of the conveyor.

In addition, it is possible to prevent vibration of the cargo during traveling from being directly added to the conveyor due to traveling of the freight vehicle with the cargo loaded in the luggage compartment floating from the conveyor's transport surface. It is possible to avoid damage and the like and improve its durability.

It is sufficient for the loading platform to be displaced relatively upward with respect to the transport surface of the conveyor. The object to be lifted by the lifting mechanism may be a loading platform or a conveyor. Therefore, the lifting mechanism may lower the conveyor to relatively lift the loading platform to the lifting height.

Another feature of the present disclosure is that the lifting mechanism raises the loading platform to displace the loading height.

According to the above feature, the loading platform is lifted by the lift mechanism so that the load is floated from the transport surface of the conveyor.

Another feature of the present disclosure is that a pair of left and right chain conveyors having an electric motor as a drive source is provided as a conveyor in the transport direction.

According to the above feature, a chain conveyor having an electric motor as a drive source is arranged at right and left at appropriate intervals, and a simple and low-cost structure is provided, so that, for example, a pallet in which a large number of packages are stacked can be stably transported. be able to.

Another feature of the present disclosure is a lift mechanism in which a lift frame is interposed between the loading platform and the loading platform of the luggage compartment. The lift mechanism is provided with a lift block having a vertically inclined guide surface on the loading platform side, and a lift frame is provided with a lift roller corresponding to the lift block. In this configuration, the loading frame is displaced in the transport direction and the lift roller is rolled on the guide surface of the lift block to move up and down, whereby the loading platform is moved up and down.

According to the above feature, the displacement of the lift frame in the transport direction is converted into the displacement in the vertical direction by the simple and low-cost configuration in which the lift roller is rolled with respect to the lift block, so that the loading platform has a lift height. Elevated to the evacuation height.

Another feature of the present disclosure is that the loading frame is provided with a pair of left and right guide rails and the lift frame is provided with guide rollers. The guide rollers are configured to roll along the guide rails to allow the loading frame to move up and down in parallel while allowing relative displacement of the lift frame in the front-rear direction.

According to the above characteristics, the loading platform is integrated with the lift frame for vertical displacement, and for longitudinal displacement (conveying direction), the loading platform is separated from the lift frame to remove the loading platform. It can be displaced only in the vertical direction. By rolling the guide rollers of the lift frame along the guide rails of the loading platform, the displacement in the front-rear direction when the loading platform moves up and down is absorbed, and the load is prevented from collapsing.

Another feature of the present disclosure is that the rotational power of the lift motor is converted into displacement of the lift frame in the transport direction via a screw shaft mechanism.

According to the above feature, the rotary power of the lift motor causes the lift frame to be displaced in the transport direction via the meshing between the screw shaft and the nut (screw shaft mechanism). With the configuration in which the lift frame is displaced in the carrying direction by using the rotational power of the lift motor as a drive source, a large power in the carrying direction of the lift frame can be obtained with a simple configuration.

It is the side view which looked at the situation of the loading operation or the unloading operation of a load using the conveyance apparatus of this embodiment from the side of a freight vehicle. It is the top view which looked at the state of the loading operation or the unloading operation of goods using the conveyance apparatus of this embodiment from the upper part of a freight vehicle. It is a top view of a freight vehicle. This figure shows a state in which luggage is not loaded in the luggage compartment. It is the rear view which looked at the luggage compartment of a freight vehicle from the back. In this figure, the lift mechanism of the first conveyor is lowered. It is the rear view which looked at the luggage compartment of a freight vehicle from the back. This figure shows a state where the lift mechanism of the first transfer conveyor is raised. It is a schematic plan view of a 1st conveyance conveyor. It is a schematic side view of a 1st conveyance conveyor. It is a side view of a part of lift mechanism of the 1st transportation conveyor.

Next, an embodiment of the present invention will be described based on FIGS. As shown in FIGS. 1 and 2, the carrier device 1 according to the present embodiment is used for the work of loading or unloading a large number of cargoes W in the cargo room 3 of the freight vehicle 2. A large number of parcels W are conveyed in a state in which a fixed number of parcels W are divided and stacked on one pallet P.

The carrier device 1 of the present embodiment includes a first carrier conveyor 10 mounted on the cargo bed 4 inside the cargo room 3, and a second carrier conveyor 20 installed outside the cargo room 3 (on the road surface). Similarly, an intermediate conveyor 30 is provided outside the luggage compartment 3 between the first transfer conveyor 10 and the second transfer conveyor 20. The first and second transfer conveyors 10 and 20 and the intermediate conveyor 30 form an L-shaped transfer path extending inside and outside the luggage compartment 3.

The first transfer conveyor 10 is a transfer conveyor whose transfer direction is the vehicle front-rear direction, and the pallet P carrying a large number of loads W from the entrance (rear part) of the luggage compartment 3 to the driver seat side rear part (front part). It has a function of transporting to the inside and conversely unloading from the back of the luggage compartment 3 to the entrance. In the present embodiment, as shown in FIGS. 2 and 3, a configuration in which two rows of the first transfer conveyors 10 are arranged in parallel on the loading platform 4 on the left and right sides is illustrated.

The first conveyor 10 includes a chain conveyor 11 in which the conveyor chains 11a are arranged along the left and right sides of the base 13, and a lift mechanism 12 arranged between the left and right conveyor chains 11a. As shown in FIG. 3, this embodiment exemplifies a configuration in which five sets of chain conveyors 11 are arranged in tandem in the front and rear, and one set of lift mechanism 12 is arranged between the left and right transport chains 11a.

Details of the first conveyor 10 are shown in FIG. However, FIG. 6 illustrates a configuration in which two sets of chain conveyors 11 are arranged in a row and one set of lift mechanism 12 is arranged between the left and right transport chains 11a. A total of four sets of transport chains 11a are laid between front sprocket 11b and rear sprocket 11c. The sprocket 11b on the front side is a drive sprocket that is rotated by a conveyance drive force using a chain motor 11d as a drive source.

The transport surfaces of the four transport chains 11a in total coincide with each other. A pallet P (a pedestal that is mainly framed with wood, on which a large number of loads W are mounted, the same applies hereinafter) is placed across the left and right transport chains 11a. Further, the operations of the four sets of transport chains 11a in total are synchronized. When each chain motor 11d is synchronously activated to the normal rotation side, the transport chain 11a circulates to the loading side. The pallets P are transported to the back side (front side) of the luggage compartment 3 as the transport chains 11a circulate to the loading side.

When each chain motor 11d is synchronously activated to the reverse rotation side, the transport chain 11a circulates to the unloading side. The pallets P are transported to the entrance side (rear side) of the luggage compartment 3 as each transport chain 11a circulates to the unloading side.

The lift mechanism 12 arranged between the left and right transport chains 11 a has a three-layer structure of a base 13, a lift frame 14, and a loading platform 15 installed on the loading platform 4, as shown in FIG. 7. The transport chains 11a are installed along the left and right sides of the rectangular flat plate-shaped base 13. The base 13 is installed so as not to be displaced in the front-rear, left-right, and up-down directions with respect to the platform 4.

The lift frame 14 is framed in a ladder shape, and lift rollers 14a and guide rollers 14b are arranged on both left and right sides thereof. The lift roller 14a and the guide roller 14b are rollers having substantially the same diameter, and are rotatably supported by a support shaft portion 14c provided so as to protrude to the left and right. A pair of lift rollers 14a and a pair of guide rollers 14b, which are arranged in pairs on one support shaft portion 14c, are arranged on the left and right side portions of the lift frame 14, four pairs each. The guide rollers 14b are arranged on the front end side of the support shaft portion 14c with respect to the lift rollers 14a at a total of eight positions on the left and right.

Lift blocks 16 are arranged at a total of eight locations on the base 13 corresponding to each of a total of eight lift rollers 14a. Details of the lift block 16 are shown in FIG. The lift roller 14 a is mounted on the upper surface of each lift block 16. The upper surface of each lift block 16 is provided with a guide surface 16a that is inclined in a direction in which the height increases toward the front side. A flat lift surface 16b is continuously provided on an upper portion (front side) of the guide surface 16a, and a flat retraction surface 16c is also continuously provided on a lower portion (rear side) thereof. Each lift roller 14a is arranged so as to roll on the guide surface 16a and be movable between the lift surface 16b and the retreat surface 16c.

The lift frame 14 is interposed between a base 13 and a loading platform 15 each having a rectangular flat plate shape. The loading platform 15 that covers the upper portion of the lift frame 14 is coupled to the base 13 by a pair of left and right connecting arms 17. One end of the connecting arm 17 is rotatably connected to the side of the base 13 in the vertical direction. The other end of the connecting arm 17 is vertically rotatably connected to the side of the loading platform 15. By being coupled to each other via the pair of left and right connecting arms 17, the loading platform 15 is supported in a state in which the loading platform 15 can move in parallel with respect to the base 13 and its displacement in the front-rear direction and the left-right direction is restricted. ing.

A pair of left and right guide rails 15 a is provided on the lower surface of the loading platform 15. The left and right guide rails 15a have a U shape and are arranged so as to open toward the sides facing each other, and extend parallel to each other in the front-rear direction. A total of eight guide rollers 14b of the lift frame 14 are rotatably supported along the left and right guide rails 15a. A total of eight guide rollers 14b are rolled along the guide rails 15a, so that the loading platform 15 is supported so as to be horizontally movable back and forth with respect to the lift frame 14.

From the above, the lift mechanism 12 has a three-layer structure of the base 13, the lift frame 14, and the loading platform 15, and the loading platform 15 is supported so as to be able to move substantially vertically with respect to the base 13. The lift frame 14 is supported between the base 13 and the loading platform 15 so as to be movable in the front-rear direction and the vertical direction.

When the lift frame 14 is displaced to the front side, a total of eight lift rollers 14a roll on the guide surface 16a of the lift block 16 in the ascending direction, so that the lift frame 14 rises by the lift amount L. By holding each lift roller 14a on the front lift surface 16b of the lift block 16, the lift frame 14 is held at the rising end position.

When the lift frame 14 is displaced to the rear side, a total of eight lift rollers 14a roll on the guide surface 16a of the lift block 16 in the descending direction, so that the lift frame 14 is lifted from the ascending end position. Move down by L. By holding each lift roller 14 a on the retreat surface 16 c of the lift block 16, the lift frame 14 is held at the lower end position.

As shown in FIG. 8, when the lift frame 14 is lifted by the lift amount L, the upper surface of the loading platform 15 is displaced to a lift height higher than the transport surface C of the chain conveyor 11. When the lift frame 14 is lowered by the lift amount L, the upper surface of the loading platform 15 is displaced to a retracted height below the transport surface C of the chain conveyor 11. In this way, by displacing the lift frame 14 back and forth and displacing the loading platform 15 up and down, the upper surface of the loading platform 15 (the loading surface of the loads W to W) becomes the transport surface C of the chain conveyor 11. On the other hand, it is possible to switch between a state of being lifted to an upper lift height and a state of being lifted to a lower retract height with respect to the transport surface C.

The displacement of the lift frame 14 in the front-rear direction is performed using the lift motor 18 as a drive source. The lift motor 18 is supported on the lower surface of the loading platform 15. The lift motor 18 is supported by the loading platform 15 in a state in which it can tilt up and down within a certain angle range.

A screw shaft 19 is coaxially coupled to the output shaft of the lift motor 18. When the lift motor 18 is activated, the screw shaft 19 rotates around the shaft. A nut 19a is meshed with the screw shaft 19 to form a screw shaft mechanism. The nut 19a is supported by the lift frame 14 so as to be vertically tiltable via a support shaft 19b. When the lift motor 18 is activated, the screw shaft 19 rotates and the meshed nut 19a is displaced forward and backward, whereby the lift frame 14 is displaced forward and backward.

When the lift motor 18 is activated in the forward rotation direction and the nut 19a is displaced forward, the lift frame 14 translates forward and the loading platform 15 rises by the lift amount L. As the loading platform 15 rises to a height higher than the transport surface C of the chain conveyor 11, the loads W to W transported into the luggage compartment 3 by the chain conveyor 11 are lifted from the transport surface C.

When the lift motor 18 is started in the reverse rotation direction and the nut 19a is displaced rearward, the lift frame 14 moves rearward in parallel and the loading platform 15 lowers by the lift amount L. When the loading platform 15 is lowered to a position lower than the transport surface C of the chain conveyor 11, the loads W to W mounted on the upper surface of the loading platform 15 are transferred onto the transport surface C of the chain conveyor 11. ..

As shown in FIG. 3, in the present embodiment, in the luggage compartment 3 of the freight vehicle 2, a pair of left and right chain conveyors 11 are arranged in tandem in the front and rear to form one set of the first conveyors 10. As shown in the figure, the first conveyors 10 are further arranged in parallel in two rows on the left and right. For each of the first conveyors 10 arranged in parallel in two rows on the left and right, one set of lift mechanisms 12 is arranged across five sets of chain conveyors 11 in the front and rear.

As shown in FIG. 2, in the present embodiment, a second transfer conveyor 20 and an intermediate conveyor 30 are installed outside the luggage compartment 3 of the freight vehicle 2. As the second conveyor 20, a roller conveyor in which a plurality of conveyor rollers 22 are arranged in parallel with each other on the upper surface of the conveyor frame 21 is used. Each of the transport rollers 22 is rotationally driven in the transport direction when a transport driving force driven by an electric motor (not shown) is transmitted by a belt. A pallet P carrying a large number of packages W to W is placed and transported on the second transport conveyor 20. In the present embodiment, the second conveyor 20 is installed with its conveying direction along the left-right direction (vehicle width direction).

Two sets of intermediate conveyors 30 are installed between the second transfer conveyor 20 and the luggage compartment 3. The intermediate conveyor 30 has a function of converting the transport direction of the luggage W between the vehicle front-rear direction and the vehicle width direction by about 90°, and a plurality of transport rollers 32 are arranged in parallel with each other on the conveyor frame 31. Further, the roller conveyor section 33 and the two sets of chain conveyors 34 that move up and down with respect to the transport roller 32 are provided. Each of the transport rollers 32 is rotationally driven by a transport driving force driven by an electric motor (not shown) as a drive source, which is transmitted by a belt.

The chain conveyor 34 has a structure in which a carrier chain is stretched between a pair of front and rear sprockets, and a sprocket on the drive side is rotated by a carrier driving force using an electric motor (not shown) as a drive source. When the drive side sprocket is rotated by the start of the electric motor and the transport chain is circulated, the packages W to W are transported together with the pallet P. The two sets of chain conveyors 34 are lifted and lowered by one lift 35. As shown in FIG. 1, an X-shaped lift arm in which two link arms 35a are rotationally coupled to each other is vertically extended and contracted using an electric motor as a drive source to elevate and lower two sets of chain conveyors 34 as shown in FIG. Is equipped with.

The roller conveyor unit 33 functions as a vehicle width direction conveyor unit, and its conveyance direction is set in the vehicle width direction (left-right direction) of the freight vehicle 2 as with the second conveyance conveyor 20, and the conveyance heights are mutually. The settings are the same. The roller conveyor portions 33 of the two sets of intermediate conveyors 30 each have a left-right conveyance path continuous with the second conveyance conveyor 20. On the other hand, each chain conveyor 34 in the two sets of intermediate conveyors 30 functions as a front-rear direction conveyor unit, and the conveying direction thereof is set in the front-rear direction of the freight vehicle 2. For this reason, the carrying direction of the intermediate conveyor 30 is switched by about 90° between the vehicle front-rear direction and the vehicle width direction by the lifting operation of the lifting lift 35.

In each of the intermediate conveyors 30, when the two sets of chain conveyors 34 are displaced upward from the conveyance surface of the roller conveyor section 33 by the lifting operation of the elevating lift 35, the conveyance direction is switched from the left-right direction to the front-rear direction. On the other hand, when the two sets of chain conveyors 34 are retracted below the conveying surface of the roller conveyor section 33 by the lowering operation of the elevating lift 35, the conveying direction is switched from the front-rear direction to the left-right direction. The transfer direction switching operation of the two sets of intermediate conveyors 30 may be performed in conjunction with each other or may be performed individually.

The transfer height of the two sets of chain conveyors 34 in each intermediate conveyor 30 is higher than that of the roller conveyor section 33, and is substantially the same as the transfer surface C of the first transfer conveyor 10 (chain conveyor 11) in the luggage compartment 3. Is set to

An auxiliary conveyer 36, which rotatably supports a plurality of conveying rollers, is arranged between each intermediate conveyer 30 and the first conveyer 10. The conveyance direction of the auxiliary conveyor 36 is set in the front-back direction like the chain conveyor 34, and the conveyance height thereof is also set to the same height as the chain conveyor 34. The auxiliary conveyor 36 conveys between the chain conveyor 34 of the intermediate conveyor 30 and the first conveyor 10 in the luggage compartment 3.

According to the transport device 1 configured as described above, the large-sized loads sequentially loaded in the back part of the luggage compartment 3 by the chain conveyor 11 are lifted together with the pallet P by the lift mechanism 12 and lifted from the transport surface C of the chain conveyor 11. It can be in a closed state. Therefore, it is possible to prevent the collapse of the load by maintaining the loading state of the large number of loads W to W even by the vibration generated by the traveling of the freight vehicle.

Further, since the large number of loads W to W are lifted from the transport surface C of the chain conveyor 11 by the lift mechanism 12, the load of vibration or the like on the chain conveyor 11 during traveling of the freight vehicle is reduced. This makes it possible to avoid damage to the chain conveyor 11 and its surrounding mechanism.

Furthermore, according to the illustrated embodiment, the second conveyor 20 and the intermediate conveyor 30 are arranged around the luggage compartment 3 to form an L-shaped transportation path to the first conveyor 10 of the luggage compartment 3. Has been done. Even when it is difficult to secure a sufficient transportation space behind the luggage compartment 3 by the transportation apparatus 1 according to the present invention, the second conveyor conveyor 20 and the intermediate conveyor 30 are used to load a large number of luggage W to W into the luggage compartment 3. Can be transported from the left or right side of the vehicle to be loaded into the luggage compartment 3 and can be unloaded on the contrary, which can save labor and speed up the transportation work.

Various modifications can be added to the embodiment described above. For example, the case where a large number of packages W are conveyed in a state of being stacked on one pallet P is illustrated, but the present invention can be applied to the case where each package W is individually handled and conveyed.

In the first transport conveyor 10, the lift frame 14 interposed between the base 13 and the loading platform 15 is moved back and forth to elevate the loading platform 15, but the loading platform 15 is moved up and down. As the lift-up mechanism to be used, for example, a lift-up mechanism that expands and lowers an X-shaped lift arm similarly to the intermediate conveyor 30 or a lift-up mechanism having a rack and pinion mechanism, a hydraulic/pneumatic cylinder, and other lifting drive sources is used. It may be configured to be used.

In the first transfer conveyor 10, a pair of roller conveyors or belt conveyors may be arranged on the left and right instead of the chain conveyor 11.

Although the loading platform 15 is displaced upward with respect to the transport surface C of the chain conveyor 11 to lift up the loaded cargo W, the pair of left and right conveyors are displaced downward to be disposed between the conveyors. It is also possible to have a structure in which the cargo W loaded by relatively lifting the loaded loading platform is lifted up from the transport surface. In this case, since the pair of left and right conveyors are vertically moved up and down by the lift mechanism, the loading platform can be configured not to be displaced vertically with respect to the loading platform 4 or the loading platform 4 can be used as the loading platform.

In the illustrated embodiment, the transport device 1 for loading and unloading the luggage W into the luggage compartment 3 of the truck is illustrated. However, the cargo W is loaded in the luggage compartment 3 of a freight vehicle such as a truck or a railroad vehicle. The present invention can be applied to a cargo room of a ship, a cargo room of a ship, and loading and unloading work into a container or a warehouse.

W...Luggage P...Pallet (for loading luggage)
DESCRIPTION OF SYMBOLS 1... Conveying device 2... Freight vehicle 3... Luggage compartment 4... Loading carrier 10... 1st conveying conveyor 11... Chain conveyor, C... Conveying surface 11a of chain conveyor 11... Conveying chain, 11b... Sprocket (front side), 11c... Sprocket (Rear side)
11d... Chain motor 12... Lift mechanism 13... Base 14... Lift frame 14a... Lift roller, 14b... Guide roller, 14c... Spindle part 15... Loading platform, L... Lifting amount of loading platform 15a... Guide rail 16... Lift block 16a... Guide surface, 16b... Lift surface, 16c... Retraction surface 17... Connection arm 18... Lift motor 19... Screw shaft (screw shaft mechanism)
Reference numeral 19a... Nuts, 19b... Spindle 20... Second conveyor 21... Conveyor frame 22... Conveying roller 30... Intermediate conveyor 31... Conveyor frame 32... Conveying roller 33... Roller conveyor 34... Chain conveyor 35... Elevating lift 35a. Link arm 36... Auxiliary conveyor

Claims (6)

A conveyor device installed in a luggage compartment of a freight vehicle for transporting luggage between an opening and a back portion of the luggage compartment, the conveyor for transporting luggage, a loading platform for loading the luggage, and the loading A conveyor device comprising a lift mechanism for vertically displacing the table between an upper lift height and a lower withdrawal height with respect to a conveyor surface. The transport apparatus according to claim 1, wherein the lift mechanism raises the loading platform to displace the lift height. The transport apparatus according to claim 1, wherein the conveyor includes a pair of left and right chain conveyors having an electric motor as a drive source in the transport direction. The transport apparatus according to any one of claims 1 to 3, wherein the lift mechanism interposes a lift frame between the loading platform of the luggage compartment and the loading platform, and the lifting mechanism moves vertically to the loading platform side. A lift block having a guide surface that inclines at the same time is provided, while a lift roller is provided at the lift frame corresponding to the lift block, and the lift frame is displaced in the transport direction so that the lift roller becomes a guide surface of the lift block. A carrier device configured to move the loading platform in parallel by rolling and raising and lowering. The transport apparatus according to claim 4, wherein a pair of left and right guide rails are provided on the loading platform, and guide rollers are provided on the lift frame, and the guide rollers are rolled along the guide rails. A transport device configured to move the loading platform up and down in parallel while allowing relative displacement of the lift frame in the front-rear direction. The transport device according to claim 4 or 5, wherein the rotational power of the lift motor is converted into displacement of the lift frame in the transport direction via a screw shaft mechanism.

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