Transport structure and transport system with lifting function

Abstract

To provide a transport structure having a lifting function which enables reduction of restrictions by a use environment in road construction.SOLUTION: According to one embodiment of the invention, a transport structure having a lifting function is provided. The transport structure includes a base 31 and a lifting mechanism. When upper-lower, front-back, and left-right orientations are defined centering on a driver of a vehicle 2 which tows or transports the transport structure, the base 31 extends in a front-back direction to be configured to load cargos thereon and is towed by or mounted on the vehicle 2 to enable forward movement. The lifting mechanism is provided at the base 31 and includes: a boom 46; a hanging mechanism 47; and a first displacement mechanism. The boom 46 extends in the front-back direction. The hanging mechanism 47 is provided at the boom 46 and configured to hang and lift the cargo. The first displacement mechanism is configured to vary vertical and anteroposterior positions of the hanging mechanism while maintaining a horizontal attitude of the boom.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a conveying structure and a conveying system having a lifting function. [Background technology]

[0002] When carrying out road construction work, such as erecting road decks, devices with lifting functions, such as cranes, are sometimes used. For example, mobile cranes and fixed bridge cranes can be used. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-312807 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there are environments where it is difficult to use a crane such as that described in Patent Document 1, such as single-lane roads and inside tunnels. In other words, there is a demand for a device that has a lifting function that is less restricted by the environment in which it can be used.

[0005] In view of the above circumstances, the present invention aims to provide a transport structure having a lifting function that is less restricted by the usage environment during road construction work. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a transport structure with a lifting function. The transport structure comprises a base and a lifting mechanism. If up, down, front, back, left and right are defined with respect to the driver of a vehicle towing or transporting the transport structure, the base extends forward and backward, thereby enabling an object to be loaded thereon. When towed or mounted on a vehicle, the transport structure can move forward. The lifting mechanism is provided on the base. It comprises a boom, a suspension mechanism, and a first displacement mechanism. The boom extends forward and backward. The suspension mechanism is provided on the boom and is configured to be able to suspend and lift an object to be transported. The first displacement mechanism is configured to vary the up, down, and front, and back, positions of the suspension mechanism while maintaining the horizontal position of the boom.

[0007] According to this embodiment, it is possible to reduce restrictions imposed by the environment in which the structure is used during road construction work, and for example, the structure can be used on single-lane roads, in tunnels, etc. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing the appearance of the transport system 1. [Figure 2] FIG. 1 is a front view showing the appearance of the transport system 1. [Figure 3] FIG. 2 is a right side view showing the appearance of the transport system 1. [Figure 4] FIG. 2 is a right side view showing the appearance of the transport system 1. [Figure 5] FIG. 10 is an explanatory diagram showing an embodiment in which the side on which the arm 42 is attached can be selected from the left and right. [Figure 6] 1, focusing on a cylinder 44 for rotating an arm 42. FIG. [Figure 7] 1 is a flowchart showing the flow of a method for replacing a road deck. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. Various features shown in the following embodiments can be combined with each other.

[0010] 1.Basic configuration In this section, a basic configuration of a conveyance system 1 according to this embodiment will be described. Figures 1 and 2 are front views showing the appearance of the conveyance system 1. Figures 3 and 4 are right side views showing the appearance of the conveyance system 1.

[0011] This transportation system 1 is a system with a lifting function. As a basic configuration, the transportation system 1 comprises a vehicle 2 and a transportation structure. In the following explanation of this embodiment, up, down, front, back, left, and right are defined from the perspective of the driver of the vehicle 2 that tows or transports the transportation structure. Furthermore, the explanation will be given using an example in which the transportation structure is a trailer 3 towed by the vehicle 2.

[0012] (Vehicle 2) The vehicle 2 is, for example, a tractor head. The vehicle 2 is illustrated with a connection portion 21, wheels 22, and a driver's seat 23. The connection portion 21 is provided at the rear of the vehicle 2 so as to extend in the front-to-rear direction. The connection portion 21 has a coupler (not shown), and the vehicle 2 may be connected to the trailer 3 via the coupler (not shown). In the connected state, the vehicle 2 is configured to tow the trailer 3.

[0013] A plurality of wheels 22 are provided below the vehicle 2 and are configured to come into contact with the ground. In Fig. 1 and Fig. 2, wheels 22a, 22b, and 22c are shown as the wheels 22 from front to rear and visible from the left. Of course, the vehicle 2 is also provided with wheels 22 (not shown) that correspond symmetrically to the wheels 22a, 22b, and 22c and face the wheels 22a, 22b, and 22c. These wheels 22 (not shown) are visible from the right side of the vehicle 2.

[0014] The wheels 22 are driven by receiving power from an engine (not shown) of the vehicle 2, and as a result, the vehicle 2 moves. A driver's seat 23 is provided at the front of the vehicle 2. The driver sits in the driver's seat 23 and operates, i.e., drives, the vehicle 2, thereby moving the vehicle 2 together with the trailer 3 to a desired location.

[0015] (Trailer 3) The trailer 3 is towed by being connected to the vehicle 2 via a coupler (not shown). That is, it is possible to load an object onto the trailer 3 and transport the object. In this embodiment, the trailer 3 also has a lifting function. Furthermore, the trailer 3 includes a base 31, wheels 32, a lifting mechanism 4, and outriggers 5.

[0016] The base 31 extends forward and backward so that it can carry the transported object that will become the lifted object 6. The transported object that will become the lifted object 6 is preferably, for example, a heavy erection component for road construction, such as a deck slab. Hereinafter, in explaining the transport system 1, the transported object will be explained as a deck slab to be laid on a road, and the transporting and lifting work performed using the transport system 1 will be explained as work to replace the deck slab on the road. Note that this is merely an example, and the uses of the transport system 1 are not limited to this.

[0017] The base 31 also has wheels 32 that enable forward movement when towed by the vehicle 2. A plurality of wheels 32 are provided below the trailer 3 and are configured to come into contact with the ground. In FIGS. 1 and 2, wheels 32a, 32b, and 32c are shown as the wheels 32, from front to rear, that are visible from the left. As shown in FIGS. 3 and 4, the trailer 3 employs a so-called double tire system, which has three wheels 32 arranged in parallel inside the wheels 32a, 32b, and 32c. Of course, the trailer 3 also has wheels 32 (see FIGS. 3 to 5) that are symmetrically aligned with the wheels 32a, 32b, and 32c and face the wheels 32a, 32b, and 32c. These wheels 32 are visible from the right side of the trailer 3, and a double tire system is also employed for these wheels. By adopting such a double tire system, the load per wheel 32 can be distributed, and the load-bearing performance of the trailer 3 can be ensured.

[0018] (Lifting mechanism 4) The lifting mechanism 4 is provided on the base 31. Specifically, the lifting mechanism 4 includes a frame 40, an arm mounting portion 41, an arm 42, a hinge 43, a cylinder 44, a hinge 45, a boom 46, a suspension mechanism 47, left and right extension portions 48, and a slide mechanism 49. In particular, the combination of the arm 42, the hinge 43, the cylinder 44, and the hinge 45 can constitute an example of a first displacement mechanism. Furthermore, the slide mechanism 49 is an example of a second displacement mechanism.

[0019] Incidentally, the lifting mechanism 4 according to this embodiment can change the positions of the boom 46 extending in the front-rear direction and the suspension mechanism 47 provided at the end of the boom 46 by using the first displacement mechanism. More specifically, the first displacement mechanism is configured to vary the up-down and front-rear positions of the suspension mechanism 47 while maintaining the horizontal posture of the boom 46. This will be described in further detail later.

[0020] The frame 40 is mounted on the base 31. The frame 40 has a pair of left and right arm attachment portions 41. The arm attachment portions 41 are components that rotatably support an arm 42 via, for example, a hinge 43. A through-hole (not shown) is provided at the end of the arm 42, and the arm attachment portion 41 can be inserted into this hole to attach the arm 42. The selective attachment of the arm 42 using the left and right arm attachment portions 41 will be described again later.

[0021] The arm 42 is configured to support a boom 46, which will be described later. In particular, as shown in Figures 1 and 2, the arm 42 can be configured from an arm 42f provided in front of the trailer 3 and an arm 42r provided in the rear. By supporting the boom 46 with the pair of front and rear arms 42f, 42r in this way, the horizontal position of the boom 46 can be maintained without relying on the rotation of the arm 42 via a hinge 43, which will be described later.

[0022] 3 and 4, the arm 42, which is an example of the first displacement mechanism, is preferably a cantilever arm that supports the boom 46 from either the left or right side. By using the arm 42 as a cantilever in this way, it is possible to broaden the limit on the width of the transported object, which is the lifted object 6. In particular, it becomes possible to transport a large lifted object 6 such as a road deck using the transport system 1.

[0023] Preferably, the arm 42 is connectable to the frame 40 via the arm attachment portion 41 described above. More preferably, in this embodiment, the side supporting the boom 46 can be changed to either the left or right side by selecting either the left or right side of the arm attachment portion 41 to which the arm 42 is connected. Figure 5 is an explanatory diagram showing a mode in which the side on which the arm 42 is attached can be selected from the left or right side. The left side of Figure 5 shows a mode in which the arm 42 is attached to the frame 40 via the left arm attachment portion 41L. The right side of Figure 5 shows a mode in which the arm 42 is attached to the frame 40 via the right arm attachment portion 41R.

[0024] As mentioned above, since the arm 42 is a cantilever arm, by being able to select either the left or right side on which to attach the arm 42, it is possible to free up space on the preferred side for work. The following provides additional information on this point. For example, in Japan, traffic is on the left side. Consider the following construction work to replace the road deck slab of a two-lane roadway, with a driving lane on the left side as viewed from the direction of travel and an overtaking lane on the right side.

[0025] When work is being carried out to replace the deck slab of the travel lane, which is the left lane, it is preferable to attach arm 42 to the right side. According to this embodiment, the space to the left of arm 42 can be used as a space for passing the load to be lifted (also called a suspended load, which in this case corresponds to the deck slab), and the safety of vehicles traveling in the right lane can be ensured.

[0026] Similarly, when replacing the deck of the passing lane, which is the right lane, it is preferable to attach the arm 42 to the left side. According to this embodiment, the space to the right of the arm 42 can be used as a space for passing a suspended load, and the safety of vehicles traveling in the left lane can be ensured. Furthermore, the space on the opposite side of the traffic lane can also be used as a space for passing a suspended load. In other words, it should be noted that this allows construction to be carried out under regulations that only allow for a single lane.

[0027] Hinge 43 connects frame 40 and arm 42 via arm attachment portion 41. Arm 42 is configured to be rotatable around hinge 43 as a fulcrum or pivot. In other words, arm 42, which is an example of a first displacement mechanism, is configured to be rotatable on plane P defined by up-down and front-rear directions around hinge 43, which is a pivot on base 31. In other words, in this embodiment, the up-down and front-rear positions of suspension mechanism 47 are determined by angle θ formed between base 31 and arm 42. The value of θ is, for example, 0 to 180 degrees, preferably 10 to 120 degrees, and more preferably 20 to 90 degrees, and specifically, for example, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, or 180 degrees, and may be within a range between any two of the values ​​exemplified here.

[0028] For example, FIG. 1 shows a state in which θ is approximately 30 degrees, with the boom 46 supported in a forward and downward position. In particular, when the transport system 1 is traveling on a road, it may pass through a place with height restrictions, such as a tunnel, so it is preferable to reduce the value of θ and lower the height of the boom 46. Furthermore, since there is no need to ensure a working radius while traveling, it is preferable that the suspension mechanism 47 provided at the tip of the boom 46 be located inside the base 31 in the front-to-rear direction, as shown in FIG. 1. In this way, when the value of θ is reduced, it is preferable to implement the transport system 1 so that its height is lower than the predetermined height stipulated by the Road Traffic Act and the like.

[0029] Also, for example, Figure 2 shows a state in which θ is approximately 90 degrees, with the boom 46 supported in a rearward and upward position. In particular, when the transport system 1 is performing road construction using its lifting function, it is necessary to provide a sufficient height for lifting, so it is preferable to increase the height of the boom 46 by setting the value of θ to 90 degrees. Also, compared to the case shown in Figure 1, the boom 46 is positioned further rearward, allowing for a larger working radius.

[0030] That is, by simply rotating the arm 42, it is possible to adjust both the height of the boom 46 and the working radius of the suspension mechanism 47, thereby realizing a lifting mechanism 4 with high adjustment efficiency.

[0031] Furthermore, to rotate the arm 42, a cylinder 44 such as a hydraulic cylinder, robot cylinder, or air cylinder configured to be able to push and pull the arm 42 may be used. FIG. 6 is a partial enlarged view of FIG. 1, focusing on the cylinder 44 for rotating the arm 42. The cylinder 44 is provided on the frame 40 and configured to extend and retract a rod portion 441. One end of the rod portion 441 is connected to the front arm 42f via a hinge 442. When the cylinder 44 retracts the rod portion 441 in direction A in FIG. 6 from the state of FIG. 1 or FIG. 6, the arm 42f is pulled, and the angle θ increases. Furthermore, because the arm 42f and the arm 42r support the boom 46, the movement of the arm 42f is transmitted to the arm 42r via the boom 46, and the tilt angle θ of the arm 42r is preferably synchronized with the tilt angle θ of the arm 42f. That is, by fixing the arm 42 and the boom 46 together with a pin or bolt, the position of the boom 46 can be varied up and down and forward and backward by driving the cylinder 44.

[0032] The hinge 45 connects the arm 42 and the left and right extension portions 48. By using the hinge 45, the left and right extension portions 48 can be rotated around the rotation axis in the front-to-rear direction associated with the angle θ without rotating on their own axes.

[0033] As shown in FIGS. 3 and 4 , the boom 46 is suspended from the left and right extensions 48 via a slide mechanism 49. The slide mechanism 49 is configured to move the left and right extensions 48 in the left-right direction together with the boom 46. While FIGS. 3 and 4 show the left and right extensions 48 and slide mechanism 49 connected to the rear arm 42r, the front arm 42f may also have a similar configuration. In other words, the slide mechanism 49, which is an example of a second displacement mechanism, is configured to vary the left and right position of the suspension mechanism 47. More specifically, the slide mechanism 49, which is an example of a second displacement mechanism, is configured to change the orientation of the boom 46 on a plane Q (not shown) defined by the front, rear, left, and right directions, thereby varying the left and right position of the suspension mechanism 47. This configuration allows the left-right position of the boom 46 to be adjusted and the orientation of the boom 46 to be finely adjusted on the plane Q defined by the front, rear, left, and right directions, thereby enabling precise positioning and adjustment of the working radius during lifting. At this time, by releasing the fixation between the arm 42 and the boom 46 by pin joints, bolt joints, etc., the left and right positions of the boom 46 can be changed by driving the cylinder 44.

[0034] The suspension mechanism 47 is provided, for example, at the rear end of the boom 46, and is configured to be able to suspend and lift the transported object 6. The mechanism of the suspension mechanism 47 is not particularly limited, and may include, for example, a trolley 471, a wire rope 472, and a spreader 473. For example, the trolley 471 may be configured to include a drum (not shown) that rotates forward and reverse by a drum drive motor, and to suspend the spreader 473 for suspending the object 6 via the wire rope 472 wound around the drum. The spreader 473 is configured to be able to rise and fall as the drum of the trolley 471 rotates forward and reverse.

[0035] (Outrigger 5) The outriggers 5 are provided on the frame 40 of the lifting mechanism 4 and are configured to come into contact with the ground. Because the outriggers 5 are in contact with the ground, the stability of the transport system 1 can be ensured when lifting work is performed using the lifting mechanism 4. Meanwhile, general outriggers different from the outriggers 5 protrude laterally from the vehicle body to ensure stability, but in this embodiment, the outriggers 5 have a structure in which they do not protrude to the left or right of the base 31. With this configuration, the outriggers 5 do not protrude into oncoming traffic lanes, so that desired road work, for example, deck slab re-covering, can be carried out simply by restricting the lane where road work is to be carried out.

[0036] More preferably, the outriggers 5 are a pair of outriggers 5f, 5r arranged at the front and rear, as shown in Figures 1 and 2. In other words, it should be noted that the outriggers 5 are not divided into left and right halves like common outriggers, but have an integrated left and right structure. This configuration makes it possible to transmit the reaction force of the outriggers 5 directly to the main girders located below the deck slab, eliminating the need for extra floor covering.

[0037] As shown in FIGS. 3 to 5, each of the pair of outriggers 5 preferably includes a pair of legs 53 and a pair of girder portions 54 in a two-to-one ratio. Here, two legs 53, namely, leg portion 53L and leg portion 53R, correspond to one girder portion 54. The two legs 53L, 53R are arranged on the left and right and connected to one girder portion 54. The leg 53 allows the vertical position of the girder portion 54 to be variable so that the girder portion 54 comes into contact with the ground. For example, the leg portion 53L and the leg portion 53R may have a jack structure.

[0038] By extending the legs 53L and 53R, which have a jack structure, from the state shown in Figure 3, the girder 54 comes into contact with the ground, making the transportation system 1 robust and stable, especially against excessive loads in the front-to-rear direction. It should be noted that during construction, the deck slab will be replaced while the transportation system 1 is positioned on the relevant lane, so stability against loads in the front-to-rear direction is particularly important. In other words, this configuration ensures the stability and safety of the transportation system 1 while minimizing restrictions on the usage environment.

[0039] 2. Deck replacement method using transport system 1 This description will explain a method for re-covering a road deck using the above-mentioned transportation system 1. Figure 7 is a flowchart showing the flow of the method for re-covering a road deck. Below, we will explain each step shown in Figure 7.

[0040] First, traffic on the lane of the road that includes the construction site, specifically the old deck slab to be removed, is restricted (step S001). At this time, it is preferable not to restrict traffic on the adjacent lanes.

[0041] Next, the transportation system 1 with the new deck slab to be newly installed mounted on the base 31 is dispatched from the factory where the new deck slab is produced to the construction site (step S002). At this time, it is preferable to dispatch the transportation system 1 with the inclination angle θ of the arm 42 set small.

[0042] Next, the tilt angle θ of arm 42 is changed to ensure the height and working radius of suspension mechanism 47 in accordance with the old deck slab (step S003). At this time, the position of suspension mechanism 47 may be fine-tuned by controlling the left-right position or orientation of arm 42.

[0043] Next, the suspension mechanism 47 is raised and lowered to suspend the old deck slab from the spreader 473, and the old deck slab is lifted and removed from the road, and then loaded onto the base 31 (step S004). At this time, it is preferable to prevent physical interference with the new deck slab that has already been loaded.

[0044] Next, the tilt angle θ of arm 42 is changed again to ensure the height and working radius of suspension mechanism 47 in accordance with the new deck slab (step S005). At this time, the position of suspension mechanism 47 may be fine-tuned by controlling the left-right position or orientation of arm 42.

[0045] Next, the hanging mechanism 47 is raised and lowered to hang the new deck slab on the spreader 473, and the new deck slab is moved by lifting from the base 31 to the periphery of the desired installation location, and the new deck slab is attached to the installation location (step S006).

[0046] Finally, the transportation system 1 with the removed old floor slab loaded on the base 31 is returned from the construction site to the factory (step S007).

[0047] By repeating the above steps S002 to S007 during times when construction is possible, for example, late at night, it is possible to replace multiple old deck slabs with new ones while suppressing lane restrictions. Finally, the traffic restrictions are lifted, and construction for the day is completed (step S008).

[0048] According to this method, the lifting, loading, and transporting of the old deck slab to be removed and the transporting, lifting, and installation of the new deck slab to be installed can be performed using a single transportation system 1, significantly improving work efficiency compared to conventional methods that require the installation of a bridge crane and a transportation vehicle separately. Furthermore, because the arm 42 is a cantilever arm and its left and right positions can be adjusted, space on the desired side can be secured, maintaining high workability. Furthermore, because the outriggers 5 do not protrude left or right, construction can be carried out without restricting adjacent lanes, simply by restricting the desired lane for a limited time, thereby minimizing restrictions imposed by the usage environment.

[0049] 3.Other The conveyance system 1 according to this embodiment may be implemented in the following manner.

[0050] (1) In the present embodiment, the rod portion 441 of the cylinder 44 is connected to the arm 42f to vary the tilt angle θ of the arm 42f, but the rod portion 441 may be connected to the arm 42r to vary the tilt angle θ of the arm 42r. Alternatively, two cylinders 44 may be employed, and the extension and retraction movements of the two cylinders 44 may be synchronized to vary the respective angles θ.

[0051] (2) In order to rotate the arm 42, a jack, a reducer, or the like may be used instead of the cylinder 44.

[0052] (3) A turning mechanism (not shown) for turning boom 46 on plane Q defined by the front-rear and left-right directions may be provided instead of slide mechanism 49. This embodiment also allows the position of suspension mechanism 47 to be adjusted.

[0053] (4) The trailer 3 is merely an example of a transport structure, and may instead be implemented as, for example, a truck bed. That is, a truck (not shown) corresponding to the vehicle 2 may be configured to transport a bed, which is an example of a transport structure.

[0054] (5) A transportation system 1 may be provided in which the vehicle 2 and the trailer 3, which is an example of a transportation structure, are integrated together.

[0055] Furthermore, it may be provided in the following aspects. In the transport structure, the first displacement mechanism includes an arm, which is a cantilever arm that supports the boom from either the left or right side. In the transport structure, the lifting mechanism further includes a frame, the frame is mounted on the base and includes a pair of arm mounting portions on the left and right, the arm is configured to be connectable to the frame via the arm mounting portions, and the side supporting the boom can be changed to the left or right by selecting either the left or right arm mounting portion to which the arm is connected. In the transport structure, the first displacement mechanism includes an arm that is configured to be rotatable on a plane defined by up-down and front-back directions around a support shaft on the base, and the up-down and front-back positions of the suspension mechanism are determined by the angle formed between the base and the arm. In the transport structure, the lifting mechanism further includes a second displacement mechanism, and the second displacement mechanism is configured to vary the left and right positions of the suspension mechanism. In the transport structure, the second displacement mechanism is configured to change the orientation of the boom on a plane defined by front-to-back and left-to-right, thereby varying the left-to-right position of the suspension mechanism. The transport structure further comprises outriggers, each of which has a structure that does not protrude to the left and right of the base and is configured to come into contact with the ground. In the transport structure, the outriggers are a pair of outriggers arranged at the front and rear, each of which has a leg and a girder in a two-to-one ratio, and the two legs are arranged on the left and right and connected to one girder, and the vertical position of the girder can be changed so that the girder comes into contact with the ground. The transport structure is a trailer or truck bed. 1. A transport system having a lifting function, comprising: a transport structure; and a vehicle, the transport structure being the transport structure, the vehicle being configured to tow or transport the transport structure. Of course, this is not the case.

[0056] Finally, while various embodiments of the present invention have been described, these are presented by way of example only and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the accompanying claims. [Explanation of symbols]

[0057] 1:Transportation system 2: Vehicle 3: Trailer 31: Foundation 4: Lifting mechanism 40: Frame 41: Arm mounting part 42: Arm 46: Boom 47: Hanging mechanism 49: Slide mechanism 5: Outrigger 53: Legs 54: Girder part 6: Lifted objects

Claims

1. A transport structure having a lifting function, A base and a lifting mechanism are provided, When the driver of the vehicle towing or transporting the transport structure is defined as the center, the up, down, front, back, left and right are defined as follows: The base is It is configured to extend forward and backward so that transported goods can be loaded thereon, By being towed or mounted on the vehicle, it is possible to move forward, The lifting mechanism includes: provided on the base, a boom, a suspension mechanism, and a first displacement mechanism; The boom extends forward and backward, the lifting mechanism is provided on the boom and is configured to be able to lift the transported object by suspending it, the first displacement mechanism is configured to vary the up-down and front-back positions of the suspension mechanism while maintaining the horizontal posture of the boom, the first displacement mechanism includes an arm; the arm is configured to be rotatable on a plane defined by up and down and front and back around a support shaft on the base; The vertical and front-rear positions of the suspension mechanism are determined by the angle between the base and the arm, The arms are connected to the left and right extensions via hinges, The boom is suspended from the left and right extension portions via a slide mechanism, The slide mechanism is configured to move the left and right extension portions in the left and right direction together with the boom.

2. 2. The conveying structure of claim 1, A transport structure, wherein the arm is a cantilever arm that supports the boom from either the left or right side.

3. 3. The conveying structure of claim 2, the lifting mechanism further comprises a frame; The frame is Mounted on the base, Equipped with a pair of arm attachment parts on the left and right, The arm The arm is connectable to the frame via the arm attachment portion, A transport structure configured such that the side supporting the boom can be changed to the left or right by selecting either the left or right arm mounting portion to which the arm is connected.

4. 4. The conveying structure of claim 3, A transport structure in which the space on either the left or right side of the arm is a space for passing a suspended load, and the other side is a lane.

5. The conveying structure according to any one of claims 1 to 4, Equipped with outriggers, The outrigger is The base has a structure that does not protrude to the left and right, A conveying structure configured to interface with the ground.

6. 6. The conveying structure of claim 5, The outriggers are a pair of outriggers arranged at the front and rear, The pair of outriggers each include a leg portion and a girder portion in a two-to-one ratio, The two legs are are arranged on the left and right sides and connected to one of the beams, A transportation structure in which the vertical position of the girder can be changed so that the girder comes into contact with the ground.

7. The conveying structure according to any one of claims 1 to 6, The carrying structure is a trailer or truck bed.

8. A conveying system having a lifting function, A transportation structure and a vehicle, The conveying structure is a conveying structure according to any one of claims 1 to 7, The vehicle is configured to tow or transport the transport structure.

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