Device for unloading containers

Abstract

To provide an unloading device for a container capable of safely and quickly unloading even a longitudinally long container.SOLUTION: This unloading device is provided with an unloading block 20 partitioning a storage space part 18 in the longitudinal direction and movable in the longitudinal direction, and a moving mechanism 30 for moving the unloading block 20. The moving mechanism 30 includes hydraulic cylinders 31 that are disposed on the 31b side of the top wall 15 of the box-shaped container main body 10 forming the housing space portion 18 and expand and contract in the front-rear direction, first bogies 32 that are attached to distal end portions of rod upper sides of the hydraulic cylinders 31 and are movable in the front-rear direction along the upper surface of the top wall 15, second bogies 33 that are disposed above the first bogies 32 and are movable in the front-rear direction along the upper surface of the top wall 15, first interlocking mechanisms 34 that interlock the front-rear movement of the first bogies 32 and the front-rear movement of the second bogies 33, and second interlocking mechanisms 35 that interlock the front-rear movement of the second bogies 33 and the front-rear movement of the unloading block 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a container that is carried on the loading platform of a vehicle such as a trailer, and more particularly to a container unloading device for unloading cargo from the container. [Background technology]

[0002] Conventionally, there is known a container trailer coupled to a tractor, which is provided with a container dump-up mechanism (see, for example, Patent Document 1). The container trailer disclosed in Patent Document 1 is structured so that a container is attached to a frame equipped with landing gear at the front via a dump hinge to enable rear dumping, and the container is tilted by a dump-up mechanism. The dump-up mechanism is configured using a hydraulic cylinder. When the container is tilted, the load inside the container slides rearward along the floor and is ejected from the rear opening of the container.

[0003] 9A and 9B are diagrams showing an example of a trailer 510 and a tractor 520 equipped with a conventional dump-up mechanism 600 for a container 100, where (a) is a side view and (b) is a rear view. Some conventional containers 100 are formed to be long in the front and rear. In a trailer 510 carrying such a long container 100, as shown in FIG. 9A, when the container 100 is tilted by the dump-up mechanism 600, the height from the ground to the top of the container 100 becomes very high. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-322476 Summary of the Invention [Problem to be solved by the invention]

[0005] When a conventional long container 100 is tilted by the dump-up mechanism 600, the center of gravity of the container 100 shifts significantly upward. At this time, as shown in FIG. 9(b), if the ground is not level, the trailer 510 may not be able to stand upright, which can be an unstable and dangerous situation. For example, a force that tends to tip the trailer 510 sideways in the direction of arrow A acts. To prevent the trailer 510 from tipping over in this way, it has been conventionally required to tilt the container 100 slowly and unload the cargo little by little over time. Therefore, unloading cargo from a conventional long container 100 has had safety and speed issues.

[0006] The present invention has been made in consideration of the above circumstances, and its object is to provide a container unloading device that can safely and quickly unload even containers that are long in length from front to back. [Means for solving the problem]

[0007] The inventions disclosed in this specification to solve the above-mentioned problems are configured as follows: That is, a first invention is a container unloading device for unloading cargo accommodated in an accommodating space of a container having a rear opening from the rear opening, the device comprising: a unloading block that divides the accommodating space into front and rear sections and is movable in a front-rear direction; and a movement mechanism for moving the unloading block, the movement mechanism comprising: a hydraulic cylinder that is arranged on an upper surface side of a ceiling wall of a box-shaped container body that forms the accommodating space and that extends and contracts in the front-rear direction; a first carriage that is attached to a tip end of a rod of the hydraulic cylinder and is movable in the front-rear direction along the upper surface of the ceiling wall; a second carriage that is arranged above the first carriage and is movable in the front-rear direction along the upper surface of the ceiling wall; a first interlocking mechanism that interlocks the front-rear movement of the first carriage with the front-rear movement of the second carriage; and a second interlocking mechanism that interlocks the front-rear movement of the second carriage with the front-rear movement of the unloading block, the first interlocking mechanism comprising a front sprocket attached to a front end of the first carriage a chain fixing part attached to the upper surface of the ceiling wall so as to be always located between the front sprocket and the rear sprocket when the first carriage moves forward and backward; a first chain having one end fixed to the chain fixing part and the other end folded back at the front sprocket to be fixed to the second carriage; and a second chain having one end fixed to the chain fixing part and the other end folded back at the rear sprocket to be fixed to the second carriage, and the second interlocking mechanism has a front pulley attached to the front end of the ceiling wall and a rear pulley attached to the rear end of the ceiling wall, a first wire having one end fixed to the upper end of the unloading block and the other end folded back at the front pulley to be fixed to the second carriage, and a second wire having one end fixed to the upper end of the unloading block and the other end folded back at the rear pulley to be fixed to the second carriage.

[0008] According to the first aspect of the present invention, a container includes a unloading block that divides the container's storage space into front and rear sections and is movable in the forward and rearward directions, and a moving mechanism for moving the unloading block. As a result, when unloading cargo from a container, the unloading block is moved from the front end of the container toward the rear end, moving the cargo rearward and discharging it through the rear opening of the container. During this process, the container does not need to be tilted using a dump-up mechanism as in the past, and the container can be maintained in a horizontal position. This prevents the container's center of gravity from shifting upward, making it less likely to become unstable and prone to tipping, even when the ground is not level. This allows safe unloading even for containers that are long in the forward and rearward directions. Furthermore, since the container's center of gravity does not shift upward during unloading, increasing the moving speed of the unloading block reduces the risk of instability and tipping. This allows for rapid unloading by sufficiently increasing the moving speed of the unloading block.

[0009] Furthermore, by providing a hydraulic cylinder that moves the first bogie in the forward / backward direction, a first interlocking mechanism that interlocks the forward / backward movement of the first bogie with the forward / backward movement of the second bogie, and a second interlocking mechanism that interlocks the forward / backward movement of the second bogie with the forward / backward movement of the unloading block, the unloading block can be moved over a distance twice that of the travel distance of the tip of the hydraulic cylinder's rod. This makes it possible to reduce the stroke required by the hydraulic cylinder compared to the length of the container from front to back, thereby expanding the range of hydraulic cylinder options compared to when the tip of the hydraulic cylinder's rod is directly connected to the unloading block. This makes it easy to install unloading equipment to accommodate long containers.

[0010] In addition, the hydraulic cylinder, the first bogie, the second bogie, the first interlocking mechanism, etc. are provided on the upper surface side of the ceiling wall of the container. This makes it possible to reduce the influence of dust generated from the cargo stored in the storage space of the container on the unloading device. This allows the unloading device to operate stably. Furthermore, the cargo stored in the storage space will not get caught on various parts of the unloading device, allowing for smooth unloading. Furthermore, since no hydraulic cylinder is provided between the unloading block of the unloading device and the front wall of the container, the unloading block can be moved close to the front wall of the container. This allows a large amount of cargo to be stored in the storage space of the container. [Effects of the Invention]

[0011] According to the container unloading device of the present invention, even containers that are long in length from front to back can be unloaded safely and quickly. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional side view of a container provided with an unloading device according to an embodiment of the present invention; [Figure 2] 1 is a cross-sectional front view of a container provided with an unloading device according to an embodiment of the present invention. [Figure 3] 1 is a side view showing a state in which a container equipped with an unloading device according to the present embodiment is unloaded while being loaded onto a trailer. [Figure 4] 1A, 1B, and 1C are diagrams showing a first carriage of the unloading device, in which (a) is a plan view, (b) is a side view, and (c) is a rear view. [Figure 5] 1A and 1B are diagrams showing a hydraulic cylinder of an unloading device, in which FIG. 1A is a plan view and FIG. 1B is a side view. [Figure 6] 10A, 10B, and 10C are diagrams showing a second carriage of the unloading device, in which (a) is a plan view, (b) is a side view, and (c) is a front view. [Figure 7]1 is a cross-sectional side view showing a state in which an unloading block has been moved to the vicinity of the front wall of a container provided with an unloading device according to this embodiment. FIG. [Figure 8] 1 is a cross-sectional side view showing a state in which the unloading block has been moved to the vicinity of the rear opening of the container in a container provided with the unloading device according to the present embodiment. FIG. [Figure 9] 1A and 1B are diagrams showing an example of a trailer and a tractor equipped with a conventional container dump-up mechanism, in which (a) is a side view and (b) is a rear view. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0014] FIG. 1 is a cross-sectional side view of a container 1 equipped with an unloading device 1a according to one embodiment of the present invention. FIG. 2 is a cross-sectional front view of a container 1 equipped with an unloading device 1a according to this embodiment. FIG. 3 is a side view showing unloading of a container 1 equipped with an unloading device 1a according to this embodiment when the container 1 is mounted on a trailer 51. As shown in FIGS. 1 to 3, the container 1 according to this embodiment is configured to be able to be loaded onto and unloaded from the bed of the trailer 51. A load is stored in the container 1 while it is mounted on the bed of the trailer 51 or before it is mounted on the bed of the trailer 51. Then, a tractor 52 coupled to the trailer 51 transports the load together with the container 1 to a destination. Suitable loads include bulk cargo such as grains, fertilizer, grass, bark, sawdust, wood chips, waste tires, and waste plastic.

[0015] The container 1 has a box-shaped container body 10 that is long in the front-to-rear direction. The container body 10 has a bottom wall 11, a pair of left and right side walls 12, 12, a ceiling wall 15, a front wall 17, and a rear opening 16. The rear opening 16 can be opened and closed by a rear door (not shown). A storage space 18 for cargo is formed inside the container body 10. The container 1 is also provided with an unloading device 1a. The unloading device 1a is used to safely and quickly unload the cargo from the storage space 18 after the cargo has been transported to its destination.

[0016] As shown in FIGS. 1 and 2, the unloading device 1a includes a unloading block 20 that divides the storage space 18 into front and rear sections and is movable in the front-rear direction, and a movement mechanism 30 for moving the unloading block 20. The movement mechanism 30 includes a hydraulic cylinder 31, a first carriage 32, a second carriage 33, a first interlocking mechanism 34, and a second interlocking mechanism 35. As shown in FIG. 1, the unloading block 20 has an inclined surface 20a at the bottom of the surface (rear surface) facing the rear opening 16. The unloading block 20 has upper rollers 21 on its upper left and right side surfaces. The unloading block 20 also has lower rollers 22 on its lower left and right side surfaces. As shown in FIG. 2, a pair of upper guide rails 14, 14 and a pair of lower guide rails 13, 13 are provided on the inner surface of the side wall 12 of the container body 10. A pair of left and right upper guide rails 14, 14 and a pair of left and right lower guide rails 13, 13 extend in the front-to-rear direction from the front end to the rear end of the container body 10. Upper rollers 21 of the unloading block 20 are engaged with the upper guide rails 14. Furthermore, lower rollers 22 of the unloading block 20 are engaged with the lower guide rails 13. This allows the unloading block 20 to move smoothly back and forth.

[0017] FIG. 4 shows the first carriage 32 of the unloading device 1a, where (a) is a plan view, (b) is a side view, and (c) is a rear view. FIG. 5 shows the hydraulic cylinder 31 of the unloading device 1a, where (a) is a plan view and (b) is a side view. FIG. 6 shows the second carriage 33 of the unloading device 1a, where (a) is a plan view, (b) is a side view, and (c) is a front view. As shown in FIGS. 1 and 5, the hydraulic cylinder 31 has a cylinder tube 31a, a rod 31b that extends and retracts relative to the cylinder tube 31a, and an attachment portion 31c formed so as to protrude to the left and right at the end of the cylinder tube 31a on the rod 31b side. The hydraulic cylinder 31 extends and retracts by the driving force of a power unit (not shown).

[0018] The cylinder stroke of the hydraulic cylinder 31 is set to be approximately half the front-to-rear length of the container 1. The hydraulic cylinder 31 is arranged on the upper surface side of the ceiling wall 15 of the container main body 10 so as to be able to expand and contract in the front-to-rear direction. The hydraulic cylinder 31 is held so as not to move in the front-to-rear direction relative to the ceiling wall 15 by attaching the mounting part 31c to the chain fixing part 343. The chain fixing part 343 is attached to the center position of the ceiling wall 15 in the front-to-rear direction. As a result, the end of the cylinder tube 31a on the rod 31b side is arranged at the center position of the ceiling wall 15 in the front-to-rear direction. In addition, the chain fixing part 343 allows the hydraulic cylinder 31 to be arranged with a gap provided between it and the ceiling wall 15 of the container main body 10.

[0019] The first bogie 32 is configured to be movable in the front-rear direction along the upper surface of the ceiling wall 15. As shown in FIG. 4, the first bogie 32 has an elongated shape in the front-rear direction. The length of the first bogie 32 in the front-rear direction is set to be approximately half the length of the container 1 in the front-rear direction. The first bogie 32 includes a front bogie section 321, a rear bogie section 322, and an elongated strip-shaped connecting section 323 that connects the front bogie section 321 and the rear bogie section 322. The front bogie section 321 has a total of four roller sections 321a in the front, rear, left, and right, a front support shaft section 321b that protrudes in the left-right direction on the upper surface side beyond the left and right roller sections 321a, and a rod tip mounting bracket 321c provided on the upper surface side. The tip of the rod 31b of the hydraulic cylinder 31 is attached to the rod tip mounting bracket 321c. Front sprockets 341 are attached to both left and right ends of the front support shaft portion 321b.

[0020] The rear truck 322 has four rollers 322a in total, one each at the front, rear, left, and right, and a rear support shaft 322b that protrudes laterally beyond the left and right rollers 322a on its upper surface. Rear sprockets 342 are attached to both left and right ends of the rear support shaft 322b.

[0021] As shown in Fig. 2, a pair of left and right first guide rails 36, 36 having a U-shaped cross section are provided on the upper surface of the ceiling wall 15 so as to extend in the front-rear direction. The first carriage 32 is engaged with the first guide rails 36, 36 by roller portions 321a, 322a. This allows the first carriage 32 to move smoothly in the front-rear direction while being guided by the first guide rails 36, 36. The first carriage 32 is also configured to move in the front-rear direction through a gap provided between the hydraulic cylinder 31 and the ceiling wall 15 of the container main body 10.

[0022] The second carriage 33 is disposed above the first carriage 32 and is configured to be movable in the front-to-rear direction along the upper surface of the ceiling wall 15. As shown in Figures 1, 2 and 6, the second carriage 33 includes a main body 33a having a flattened rectangular parallelepiped shape, four roller units 33b attached to the front, rear, left and right sides of the main body 33a, and a pair of left and right chain attachment units 33c, 33c provided on the bottom surface of the main body 33a.

[0023] As shown in FIG. 2, a pair of left and right rail support members 37 are provided on the upper surface of the ceiling wall 15 to sandwich a pair of left and right first guide rails 36 in the left-right direction. The pair of left and right rail support members 37 extend in the front-rear direction. A second guide rail 38 having a U-shaped cross section is provided on the upper surface of each rail support member 37 so as to extend in the front-rear direction along the rail support member 37. The pair of second guide rails 38 are positioned above the first carriage 32 engaged with the first guide rails 36 by the rail support members 37. The second carriage 33 is engaged with the second guide rails 38 by roller portions 33b. This allows the second carriage 33 to move smoothly in the front-rear direction while being guided by the second guide rails 38.

[0024] The first interlocking mechanism 34 interlocks the forward and backward movement of the first carriage 32 with the forward and backward movement of the second carriage 33. As shown in Figures 1 and 2, the first interlocking mechanism 34 has a pair of left and right front sprockets 341, 341, a pair of left and right rear sprockets 342, 342, a pair of left and right chain fixing portions 343, 343, a pair of left and right first chains 344, 344, and a pair of left and right second chains 345, 345.

[0025] 4, the front sprocket 341 is attached to the front end of the first bogie 32. The rear sprocket 342 is attached to the rear end of the first bogie 32. More specifically, the front sprocket 341 is rotatably attached to both ends of the front support shaft 321b. The rear sprocket 342 is rotatably attached to both ends of the rear support shaft 322b.

[0026] 1, one end of the right first chain 344 is fixed to the right chain fixing part 343, and the other end is folded back from the front to the rear at the right front sprocket 341 and fixed to the right chain attachment part 33c of the second carriage 33. Similarly, one end of the left first chain 344 is fixed to the left chain fixing part 343, and the other end is folded back from the front to the rear at the left front sprocket 341 and fixed to the left chain attachment part 33c of the second carriage 33. One end of the right second chain 345 is fixed to the right chain fixing part 343, and the other end is folded back from the rear to the front at the right rear sprocket 342 and fixed to the right chain attachment part 33c of the second carriage 33. In addition, one end of the left second chain 345 is fixed to the left chain fixing portion 343, and the other end is folded back from the rear to the front at the left rear sprocket 342 and fixed to the left chain mounting portion 33c of the second carriage 33.

[0027] The second interlocking mechanism 35 interlocks the forward and backward movement of the second carriage 33 with the forward and backward movement of the unloading block 20. As shown in FIGS. 1 and 2 , the second interlocking mechanism 35 has a pair of left and right front pulleys 351, 351, a pair of left and right rear pulleys 352, 352, a pair of left and right first wires 353, 353, and a pair of left and right second wires 354, 354. The pair of left and right front pulleys 351, 351 are rotatably attached to the front end of the ceiling wall 15. The pair of left and right rear pulleys 352, 352 are rotatably attached to the rear end of the ceiling wall 15. One end of the right first wire 353 is fixed to the front upper end of the unloading block 20, and the other end is folded back from the front to the rear at the right front pulley 351 and fixed to the right front part of the main body 33a of the second carriage 33. One end of the left first wire 353 is fixed to the front upper end of the unloading block 20, and the other end is folded back from the front to the rear at the left front pulley 351 and fixed to the left part of the front surface of the main body 33a of the second carriage 33. One end of the right second wire 354 is fixed to the rear upper end of the unloading block 20, and the other end is folded back from the rear to the front at the right rear pulley 352 and fixed to the right part of the rear surface of the second carriage 33. One end of the left second wire 354 is fixed to the rear upper end of the unloading block 20, and the other end is folded back from the rear to the front at the left rear pulley 352 and fixed to the left part of the rear surface of the second carriage 33.

[0028] FIG. 7 is a cross-sectional side view showing a state in which the unloading block 20 of the container 1 equipped with the unloading device 1a according to this embodiment has been moved to the vicinity of the front wall 17 of the container 1. FIG. 8 is a cross-sectional plan view showing a state in which the unloading block 20 of the container 1 equipped with the unloading device 1a according to this embodiment has been moved to the vicinity of the rear opening 16 of the container 1. In the container 1 of this embodiment, when cargo is to be stored in the storage space 18, as shown in FIG. 7, the unloading block 20 is moved to the vicinity of the front wall 17 of the container 1. At this time, the hydraulic cylinder 31 is in a contracted state, and the first carriage 32 has moved to its reverse limit position. In addition, the front sprocket 341 attached to the front support shaft 321b of the first carriage 32 is positioned slightly forward of the chain fixing portion 343. In addition, the rear sprocket 342 attached to the rear support shaft 322b of the first carriage 32 is positioned so as to overlap with the rear pulley 352 in a side view. The chain attachment portion 33 c of the second carriage 33 is located slightly forward of the rear sprocket 342 .

[0029] When unloading cargo stored in the storage space 18 of the container 1, the rod 31b of the hydraulic cylinder 31 is extended relative to the cylinder tube 31a. The driving force generated by the extension of the rod 31b of the hydraulic cylinder 31 is transmitted to the first carriage 32, causing the first carriage 32 to move forward. As the first carriage 32 moves forward, the first carriage 32 moves away from the chain fixing part 343 because the chain fixing part 343 is fixed to the ceiling wall 15. As a result, the front sprocket 341 and the chain fixing part 343 of the first carriage 32 pull the first chain 344 forward, causing the second carriage 33 to move forward toward the front sprocket 341, thereby reducing the distance between the chain attachment part 33c of the second carriage 33 and the front sprocket 341. Figure 1 shows this state.

[0030] As shown in FIG. 8, when the rod 31b of the hydraulic cylinder 31 is extended and the first carriage 32 moves close to the forward limit position, the front sprocket 341 of the first carriage 32 is positioned so as to partially overlap the front pulley 351 in a side view. The rear sprocket 342 of the first carriage 32 is positioned slightly rearward of the chain fixing part 343. The chain attachment part 33c of the second carriage 33 is positioned slightly rearward of the front sprocket 341. At this time, the unloading block 20 is in a state of having moved backward close to the rear opening 16. As can be seen from FIGS. 1, 7, and 8, the chain fixing part 343 is configured to be always located between the front sprocket 341 and the rear sprocket 342 when the first carriage 32 moves forward or backward. Furthermore, although the cylinder stroke of the hydraulic cylinder 31 is approximately half the longitudinal length of the container 1, the extension and contraction of the hydraulic cylinder 31 makes it possible to move the unloading block 20 from near the front wall 17 of the container body 10 to the rear opening 16. The reason for this will be explained in detail below.

[0031] First, the extension amount of the rod 31b relative to the cylinder tube 31a of the hydraulic cylinder 31 is the same as the movement distance of the first cart 32. Of the first chain 344 (second chain 345) wound around the front sprocket 341 (rear sprocket 342) of the first cart 32, the movement distance of the end connected to the chain attachment part 33c is twice the movement distance of the first cart 32 because the first chain 344 (second chain 345) is folded back at the front sprocket 341 (rear sprocket 342). The second cart 33 having the chain attachment part 33c moves together with the first chain 344 (second chain 345), and therefore moves a distance twice the cylinder stroke of the hydraulic cylinder 31. While the front sprocket 341 of the first cart 32 moves from the center position of the container 1 to the front end, the second cart 33 moves from the rear end to the front end of the container 1. The unloading block 20 connected to the first wire 353 and the second wire 354 moves from the front end to the rear end of the container 1. In this way, the unloading block 20 moves to the rear opening 16 at the rear end of the container 1, whereby all of the cargo in the container space 18 is discharged and unloading is completed.

[0032] As described above, the unloading device 1a for a container 1 according to this embodiment includes the unloading block 20 that divides the storage space 18 into front and rear sections and is movable in the front-rear direction, and a movement mechanism 30 for moving the unloading block 20. The movement mechanism 30 includes a hydraulic cylinder 31 that is arranged on the upper surface side of the ceiling wall 15 of the box-shaped container body 10 that forms the storage space 18 and that expands and contracts in the front-rear direction, a first carriage 32 that is attached to the tip of the rod 31b of the hydraulic cylinder 31 and is movable in the front-rear direction along the upper surface of the ceiling wall 15, a second carriage 33 that is arranged above the first carriage 32 and is movable in the front-rear direction along the upper surface of the ceiling wall 15, a first interlocking mechanism 34 that interlocks the front-rear movement of the first carriage 32 with the front-rear movement of the second carriage 33, and a second interlocking mechanism 35 that interlocks the front-rear movement of the second carriage 33 with the front-rear movement of the unloading block 20.

[0033] The first interlocking mechanism 34 has a front sprocket 341 attached to the front end of the first bogie 32, a rear sprocket 342 attached to the rear end of the first bogie 32, a chain fixing part 343 attached to the upper surface of the ceiling wall 15 so as to be always present between the front sprocket 341 and the rear sprocket 342 when the first bogie 32 moves back and forth, a first chain 344 having one end fixed to the chain fixing part 343 and the other end folded back at the front sprocket 341 and fixed to the second bogie 33, and a second chain 345 having one end fixed to the chain fixing part 343 and the other end folded back at the rear sprocket 342 and fixed to the second bogie 33.

[0034] The second interlocking mechanism 35 has a front pulley 351 attached to the front end of the ceiling wall 15, a rear pulley 352 attached to the rear end of the ceiling wall 15, a first wire 353 having one end fixed to the upper end of the unloading block 20 and the other end folded back at the front pulley 351 and fixed to the second trolley 33, and a second wire 354 having one end fixed to the upper end of the unloading block 20 and the other end folded back at the rear pulley 352 and fixed to the second trolley 33.

[0035] According to the above configuration, when unloading cargo from the container 1, the unloading block 20 can be moved from the front end to the rear end of the container 1, thereby moving the cargo from the container 1 rearward and discharging it through the rear opening 16 of the container 1. During this process, there is no need to tilt the container 1 using the dump-up mechanism 600 as in the conventional method, and the container 1 can be maintained in a horizontal position. This prevents the center of gravity of the container 1 from moving upward, making it less likely to become unstable and at risk of tipping over, even when the ground is not level. This allows safe unloading even for containers that are long in the front-to-rear direction. Furthermore, since the center of gravity of the container 1 does not move upward during unloading, increasing the movement speed of the unloading block 20 makes it less likely to become unstable and at risk of tipping over. This allows for rapid unloading by sufficiently increasing the movement speed of the unloading block 20.

[0036] Furthermore, by providing the hydraulic cylinder 31 that moves the first bogie 32 in the longitudinal direction, the first interlocking mechanism 34 that interlocks the longitudinal movement of the first bogie 32 with the longitudinal movement of the second bogie 33, and the second interlocking mechanism 35 that interlocks the longitudinal movement of the second bogie 33 with the longitudinal movement of the unloading block 20, the unloading block 20 can be moved a distance that is twice the distance that the tip of the rod 31b of the hydraulic cylinder 31 moves. This makes it possible to make the stroke amount required by the hydraulic cylinder 31 smaller than the longitudinal length of the container 1, thereby broadening the range of options for the hydraulic cylinder 31 compared to when the tip of the rod 31b of the hydraulic cylinder 31 is directly connected to the unloading block 20. This makes it possible to easily provide the unloading device 1a to accommodate long containers 1.

[0037] Furthermore, the hydraulic cylinder 31, the first carriage 32, the second carriage 33, the first interlocking mechanism 34, etc. are provided on the upper surface side of the ceiling wall 15 of the container 1. This makes it possible to make the unloading device 1a less susceptible to the effects of dust generated from the cargo stored in the storage space 18 of the container 1. This allows the unloading device 1a to operate stably. Furthermore, the cargo stored in the storage space 18 will not get caught on various parts of the unloading device 1a, allowing for smooth unloading. Furthermore, since the hydraulic cylinder 31 is not disposed between the unloading block 20 of the unloading device 1a and the front wall 17 of the container 1, the unloading block 20 can be moved close to the front wall 17 of the container 1. This allows a large amount of cargo to be stored in the storage space 18 of the container 1.

[0038] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The technical scope of the present invention is not to be interpreted solely by the above-described embodiments, but is defined by the claims. The technical scope of the present invention also includes all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0039] 1 container 1a Unloading equipment 10 Container body 15 Ceiling Wall 18 Storage space 20 Unloading Block 30 Moving mechanism 31 Hydraulic cylinder 31b Rod 32 First bogie 33 Second bogie 34 1st interlocking mechanism 35 Second interlocking mechanism 341 front sprocket 342 rear sprocket 343 Chain fixing part 344 First Chain 345 Second Chain 351 Front Pulley 352 Rear pulley 353 First Wire 354 Second Wire

Claims

[Claim 1] A container unloading device for unloading cargo accommodated in an accommodating space of a container having a rear opening from the rear opening, comprising: a loading block that divides the storage space into front and rear sections and is movable in the front-rear direction; and a movement mechanism for moving the loading block. The moving mechanism includes: a hydraulic cylinder arranged on the upper surface side of the ceiling wall of a box-shaped container body that forms the storage space and that extends and contracts in the front-rear direction; a first carriage attached to a tip end of a rod of the hydraulic cylinder and movable in a front-rear direction along an upper surface of the ceiling wall; a second carriage disposed above the first carriage and movable in the front-rear direction along the upper surface of the ceiling wall; a first interlocking mechanism that interlocks the forward and backward movement of the first carriage with the forward and backward movement of the second carriage; a second interlocking mechanism that interlocks the forward and backward movement of the second carriage with the forward and backward movement of the unloading block, The first interlocking mechanism is a front sprocket attached to a front end portion of the first bogie; a rear sprocket attached to a rear end portion of the first bogie; a chain fixing portion attached to an upper surface of the ceiling wall so as to be always located between the front sprocket and the rear sprocket when the first carriage moves forward and backward; a first chain having one end fixed to the chain fixing portion and the other end folded back at the front sprocket and fixed to the second carriage; a second chain having one end fixed to the chain fixing portion and the other end folded back at the rear sprocket and fixed to the second carriage, The second interlocking mechanism is a front pulley attached to a front end portion of the ceiling wall; a rear pulley attached to a rear end portion of the ceiling wall; a first wire having one end fixed to the upper end of the unloading block and the other end folded back by the front pulley and fixed to the second carriage; a second wire having one end fixed to the upper end of the unloading block and the other end folded back at the rear pulley and fixed to the second carriage; A container unloading device characterized by:

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