JPH04859B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention automatically opens the rear door of a container transport vehicle when the container is dumped, and further automatically closes the rear door when the container is removed from the chassis side. This is used in the field of rear door opening/closing devices for container transport vehicles.

(b) Conventional technology In conventional container transport vehicles, the rear door of the container opened downward, so when dumping and discharging large objects such as iron scraps and rocks, they were packed in the rear door and discharged. There is a problem that the rear door may be difficult to open, or the loaded object may collide with the rear door and damage the rear door or its upper hinge.

(c) Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned problems. and,
The purpose is to automatically open the rear door with the dump truck and to automatically close the rear door when the container is removed from the chassis side.

(d) Means for Solving the Problems The present invention is characterized by being able to load containers onto the chassis and lower them onto the ground using cargo handling means provided on the chassis.
In a container transport vehicle in which a dump frame that rotates around a rear hinge portion of the chassis and the container are integrated to dump the container, the rear door of the container can be opened and closed upwards, and the bottom of the container can be opened and closed. A first swinging arm pivotally supported by the rear door is connected via a link mechanism, and the first swinging arm is guided and rolled on the chassis side, and the rear door is opened in conjunction with the dumping operation of the container. The first to open and close
A guide member is provided, and a second swinging arm provided at the bottom of the container is connected to a locking arm that engages with the first swinging arm by a resilient force, and the second swinging arm is provided on the dump frame side. If a second guide member is provided with which the arm comes into contact, and the container is mounted on the chassis rather than on the ground, the second swing arm is actuated by the contact between the second swing arm and the second guide member. The present invention provides a rear door opening/closing device for a container carrier in which the first swinging arm and the locking arm are disengaged from each other.

(e) Examples Embodiments of the present invention will be described based on the drawings.

In FIGS. 1 and 2, a container 1 has a rear door 2 at its rear end that is pivotally connected to a pivot shaft 3 so as to be able to open and close upwards.

4 is a chassis, and this chassis 4 is composed of a chassis frame 5 and a subframe 6 fixed on the chassis frame 5, and a dump frame 11 (described later) is attached to the rear end of the subframe 6 as a shaft. A supporting hinge part 7 is formed, and a guide roller 9 is pivotally attached to this hinge part 7 by a support shaft 8, and the main beams 10, 10 of the container 1 ride on the pair of left and right guide rollers 9, 9. Thus, the container 1 is guided and supported when it is loaded onto the chassis 4 side and when it is removed from the chassis 4 side.

Reference numeral 11 denotes a dump frame whose rear end is pivotally connected to the sub-frame 6 on a support shaft of a hinge portion 7, and an intermediate frame 12 is pivotally connected to the tip of this dump frame 11 on a shaft 13. There is.

Reference numeral 14 denotes an L-shaped front arm, which is pivotably connected near the tip of the intermediate frame 12 at a shaft 15, and has a hook 1 at the upper end of the tip arm 14.
6 is formed and is hooked onto a hooking member 17 protruding from the front wall of the container 1.

18 is a first hydraulic cylinder, which is connected to the intermediate frame 12;
1, the arm 14 is rotated about the shaft 15 from the orthogonal state to the bent state as shown in FIG.

Reference numeral 19 denotes a second hydraulic cylinder, whose base end is pivotally connected to the front part of the subframe 6, and whose tip is pivotally connected to a part of the intermediate frame 12 through a shaft 20. When the second hydraulic cylinder 19 expands and contracts, The intermediate frame 12 rotates around the shaft 13, and the first hydraulic cylinder 18
The arm 14 is bent with respect to the intermediate frame 12 due to the expansion and contraction operation, and the container 1 is moved to the chassis 4
It can be mounted on the side, or it can be detached and lowered to the ground. By the way, 21 is dump frame 1
1 and the bottom surface of the container 1.If the locking/disengaging mechanism 21 is switched to the locked state as shown in FIG. 2 and the second hydraulic cylinder 19 is extended, the dump frame 11 Then, the intermediate frame 12 and the container 1 are tilted, and the loaded material can be discharged in a dump state.

Next, in FIGS. 3 to 10, an embodiment of the rear door opening/closing device of the container 1 of the container transport vehicle described above is specifically shown.

The rear door 2 has a side wall rear end 22 of the container 1 inclined forward and downward, and can be opened and closed around a pivot shaft 3.

Further, the deck plate 23 is tilted rearward and upward so that the rear end edge 23a is at an intermediate height between the upper and lower sides of the rear end surface of the container 1, and the pivot shaft 3 is arranged at an intermediate height between the upper and lower sides of the rear end surface of the container 1. will be established. Furthermore, a triangular protruding piece 24 is formed on the rear door 2.

25 is a first
The swinging arm is made up of three plates 26... and a boss part 27. The boss part 27 is fixed to a rotating shaft 28 horizontally suspended in the container 1, and together with this rotating shaft 28, the first swinging arm 25 oscillates as a unit.

B is a link mechanism for interlockingly connecting the first swing arm 25 and the rear door 2, and this link mechanism B includes the rotating shaft 28 and a lever fixed to the rotating shaft 28 and projecting upward. 29, a spring cylinder 30 whose one end is pivotally connected to the upper end of the lever 29, a bell crank 31 to which the other end of the spring cylinder 30 is pivotally connected, and the bell crank 31 and the protruding piece 24 of the rear door 2. It is composed of a connecting rod 32.

A first roller 33 is pivotally supported on the free end of the first swinging arm 25, and is rotatably supported on a shaft 34 on the outside between the three plates 26... There is.

Further, the subframe 6 on the side of the chassis 4 is provided with a first guide member 35 on which the first roller 33 is guided by rolling thereon.

The first guide member 35 has a rounded part 35a, a horizontal side part 35b, and a horizontal side part 35, as shown in FIG.
A concave arc portion 35c continuously formed in front of b.
In the running state (non-dumping state), the first roller 33 contacts the front part of the horizontal side portion 35b, and closes the rear door 2 via the first swing arm 25 and the link mechanism B.

During dumping, the rear door 2 is biased in the opening direction by its own weight, so in Figure 9, a→b→
In order from c to d, the first roller 33 is guided by the concave arc portion 35c of the first guide member 35, and the first swing arm 25 gradually rotates through the link mechanism B as shown in FIG. The rear door 2 opens, and the deck plate 23 and the inner surface of the rear door 2 become flush with each other as shown in FIG.

By the way, in this Figure 10, the horizontal axis shows the dumping angle of the container 1 from now on with the running state being 0 degrees, and the vertical axis shows the opening degree θ with respect to the rear edge 22 of the side wall. It can be seen that the rear door 2 is fully opened at a dumping angle of about 20 degrees and becomes flush with the deck 23.

Of course, the arc portion 35c of the first guide member 35
The shape and dimensions of can be freely changed, and by changing these appropriately, the full opening time can be advanced or delayed.

Reference numeral 36 denotes a hook-shaped locking arm. This locking arm 36 swingably supports a shaft 37 near the bottom of the container 1, and is fixed to a part of the shaft 37.

38 is a second hinge pivotally mounted near the bottom of the container 1.
The swinging arm is made up of two plates 39, 39 and a boss part 40, and has a rotating shaft 41 attached to the container 1.
The boss portion 40 is fixed to the rotary shaft 41, and the second swing arm 38 swings integrally with the rotating shaft 41.

C is a link mechanism for interlockingly connecting the second swing arm 38 and the locking arm 36. A lever 42, a lever 43 fixed to the other end of the rotating shaft 37, and a rod 4 connecting this lever 43 and the lever 42.
It consists of 4.

A second roller 46 is rotatably attached to the free end of the second swing arm 38 by a pin 45.
Reference numeral 47 denotes a second guide member fixed to the shaft 48 that connects the left and right dump frames 11, 11.
While swinging around, the second roller 46 is guided and rolled.

Numeral 49 is an elastic member made of a coil spring that pulls the locking arm 36 so as to elastically swing downward. It engages with the inner shaft 34 between the sheets 26, and prevents the first roller 33 from swinging around the axis of the shaft 28, thereby preventing the rear door 2 from opening.

Conversely, if the container 1 is loaded from the rear of the chassis 4, the second roller 46 will move against the second guide member 47.
The locking arm 36 is brought into contact with the shaft 34, swings in the direction of arrow D, and disengages the locking arm 36 from the shaft 34 via the link mechanism C. Note that during the operation, the first roller 33 first moves to the first guide member 35.
When it rides on the rounded part 35a of the spring tube 3
0 is slightly extended and the first swing arm 25 swings slightly counterclockwise.

At this time, the second roller 46 moves to the second guide member 47.
, the locking arm 36 and the first roller 3
There will be a slight gap between 3 and 3. Next, as the container 1 moves forward, the second roller 46 is pushed up between the position shown in FIG. 4 and the position shown in FIG. 5, and the locking arm 36 is pulled up via the link mechanism C.
The locking arm 36 is disengaged from the first roller 34, and the role of closing the rear door 2 is replaced by the first roller.
This is done by the horizontal side portion 35b of the guide member 35. Further, a, b, c, and d in FIG. 9 sequentially show the container 1 tilting to a gradually larger dumping angle. The container 1 comes into contact with the second guide member 37 that is swinging.
There is almost no relative movement between the link mechanism C and the
The locking arm 36 maintains an open state with respect to the first roller 33. It should be noted that the present invention is free to change the design in addition to the above-mentioned embodiments.
However, the rollers 33, 46 are omitted and the swinging arms 25, 38 are directly brought into contact with each other.
may be brought into contact with each guide member 35, 47.

Further, as shown in FIG. 11, the link mechanism C between the second swing arm 25 and the locking arm 36 in FIG. 4 is omitted, and the locking arm 36 is directly connected to the second swing arm 38.
It may be fixed to the rotating shaft 41 of.

In addition, the rod 32 of the link mechanism B is used as a compression member when the rear door 2 opens, but as shown in FIG. , rod 3 of link mechanism B
2 may be used as a tension member. Alternatively, as shown in FIG. 13, a first guide member 35 may be provided on the subframe 6, and the rod 32 may be used as a tension member when the rear door 2 is opened.

Further, as shown in FIG. 14, the rod 32 of the link mechanism B may be attached directly to the shaft 34, or the rod 32 may be attached above the shaft 34 of the first swing arm 25. Further, the present invention provides the second guide member 47
is attached to the shaft 48, but the shaft 48
It may be directly attached to the dump frame 11 that is integrated with the dump frame 11. Furthermore, although the present invention mounts the container 1 using the front arm 14, hydraulic cylinders 18, 19, etc., it can also be applied to a type of container transport vehicle that uses a winch to pull up the container along a dump frame.

(f) Effects of the Invention As described in detail, the present invention enables the rear door of a container to be opened upward and connects the first swinging arm pivotally supported at the bottom of the container and the rear door via a link mechanism. A first guide member is provided on the chassis side to guide and roll a first swing arm to open and close the rear door in conjunction with the dumping action of the container, and a second swing arm provided at the bottom of the container. and a locking arm that engages with the first swinging arm by a resilient force, and the dump frame is provided with a second guide member that abuts the second swinging arm, and the container is moved from the ground to the top of the chassis. If the second swing arm is mounted on the second swing arm, the second swing arm is actuated by the contact between the second swing arm and the second guide member, and the engagement between the first swing arm and the locking arm is disengaged. When dumping and discharging large loads such as iron scraps and rocks, the rear door and hinges can be dumped without damaging them.
To smoothly and quickly discharge loaded items, and to automatically open a rear door along with a dump truck, and to automatically close the rear door when a container is removed from the chassis side.

Furthermore, since the second guide member is provided on the dump frame side, the second guide member rotates together with the dump frame when dumping boxes.

Therefore, the positional relationship between the second swing arm and the second guide member does not change relatively, so there is no need to make the upper surface of the second guide member a large convex arc.

[Brief explanation of drawings]

1 and 2 are simplified side views for explaining the operation of the container transport vehicle, FIG. 3 is a side view showing an embodiment of the present invention, FIGS. 4 and 5 are detailed views of the main parts, and FIG. 6
The figure is a view from the A to A arrow of Fig. 5, Fig. 7 is a view from the Ro to Lo arrow of Fig. 5, Fig. 8 is a view from the A to H arrow of Fig. 5, and Fig. 9 is for explanation of the function. A simplified side view, FIG. 10 is a diagram showing the opening degree of the rear door with respect to the dumping angle, and FIGS. 11 to 14 are enlarged views of main parts of other embodiments. 1 is a container, 2 is a rear door, 4 is a chassis, 7 is a hinge part, 11 is a dump frame, 25 is a first swinging arm, 33 is a first roller, 35 is a first guide member,
36 is a locking arm, 38 is a second swing arm, 46 is a second roller, 47 is a second guide member, and B is a link mechanism.

Claims (1)

[Claims] 1. The container can be loaded onto the chassis or lowered onto the ground by means of a cargo handling means provided on the chassis, and the container is integrated with a dump frame that rotates around the rear hinge of the chassis. In a container transport vehicle for dumping containers, the rear door of the container can be opened and closed upwards, and the first swinging arm pivotally supported at the bottom of the container is connected to the rear door via a link mechanism. The chassis is provided with a first guide member that guides and rolls the first swinging arm and opens and closes the rear door in conjunction with the dumping operation of the container, while the second swinging arm provided at the bottom of the container and the connecting a locking arm that engages with the first swinging arm by a resilient force;
The dump frame is provided with a second guide member to which the second swinging arm comes into contact, and when the container is mounted on the chassis rather than the ground, the second swinging arm and the second guide member come into contact with each other. A rear door opening/closing device for a container carrier, in which a second swinging arm is actuated to disengage and disengage a first swinging arm and a locking arm.