JP2003095007A - Cargo gear for container cargo vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the speed of operating an L-shaped arm from a retracted/ loaded state to a rearward fallen state when an empty container is loaded or no container is loaded, and to reduce noises and fuel expenses. SOLUTION: A lift cylinder 35 is provided with for switching an L-shaped arm rotating against a car body frame from the contracted/loaded state to the rearward fallen state and vice versa. A solenoid switching valve 64 for relectively switching the return side of a seventh pipe 58a to communicate with a sixth pipe 57a side or an oil storage tank 44 side of an oil pressure pump 43 is interposed between the sixth pipe 57a of an anti-rod side oil channel 38 in communication with an anti-rod side chamber 35a of the lift cylinder and the seventh piping 58a of a rod side oil channel 39 in communication with a rod side chamber 35b of the lift cylinder. The switching valve is switched so that the return side of the seventh pipe can be communicated through a connection channel 62 to the sixth pipe when an empty container is loaded or no container is loaded.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container cargo handling vehicle.
Regarding the cargo handling equipment for container handling vehicles installed in
The loading frame is mounted using a hydraulic cylinder
Speed when turning from the
Pertaining to the measures to be taken. [0002] Conventionally, containers mounted on a chassis have been
A container provided on the container handling vehicle for loading and unloading
A cargo handling device for a container handling vehicle is known. like this
The cargo handling device for a container handling vehicle is, for example, actually open flat 2-3.
No. 8240, the base end is the rear end of the chassis.
To be able to rotate around the vehicle width direction axis
A tilting frame provided to be tiltable with respect to the
The base end of the frame is rotatable via the vehicle width axis
Supported, and the tilting frame is fixed so that it cannot tilt with respect to the chassis.
By turning the vehicle in the front-rear direction with the
Cargo handling frame for loading and unloading antennas between chassis and ground
Is provided between the cargo handling frame and the chassis,
Place the tilting frame or cargo handling frame in the vehicle width direction
Telescopic hydraulic cylinder that rotates around the
Equipped with a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder
I have. In this case, the hydraulic pump should be a constant displacement pump.
Pumps or variable displacement pumps are applied. The container mounted on the undercarriage
To lower the ground from the mounted state,
When hydraulic oil is supplied to the opposite rod side chamber of the hydraulic cylinder,
The hydraulic oil in the rod side chamber of the hydraulic cylinder is
By returning the hydraulic cylinder to the storage tank,
Let With this extension operation, check whether the cargo handling frame is
From the rear of the vehicle to the lying state.
On the other hand, to load containers on the ground,
Hydraulic oil from the pump to the rod side chamber of the hydraulic cylinder.
Oil supply tank and the hydraulic oil in the opposite rod side chamber
Then, the hydraulic cylinder is caused to contract.
As a result, the cargo handling frame moves
It is turned back to the mounted state. [0004] By the way, the above conventional art
In the cargo handling equipment for container handling vehicles, the hydraulic cylinder
The axis is in front of the undercarriage when the cargo handling frame is placed
Incline in a nearly horizontal state with a slight downward slope toward
The force to extend the hydraulic cylinder (oil
Pressure) the upward component force is at a minimum. Therefore, the load
Position the role frame slightly rearward from the horizontal position
Until it turns to the initial turning state where it becomes a down slope,
In other words, the initial extension operation (for example, the maximum extension
Until the operation is extended to about one-tenth of the operation)
Requires the maximum oil pressure, and this maximum oil pressure
Power for driving the pump, for example, the engine
We need to make the most of it. [0005] In that case, make full use of the power of the engine
All you need to do is fill a container with a full container
(Full container) only
Empty container (contains no contents)
Container) is installed, or the container is
If no container is installed and no container is
It is not necessary to maximize the power of the
It becomes important. Therefore, the pump is rotated at a high speed to reduce the amount of hydraulic oil.
By increasing the discharge amount, the empty container loading state or
The rear of the chassis by the cargo handling frame without the container
It is possible to speed up the conversion operation to the falling state
Has been done. As described above, the empty container mounted state or the core
From the loading state of the cargo handling frame when the antenna is not mounted
Speed up the conversion to the falling state behind the chassis
Power (for example, air) to rotate the pump at high speed.
The power of the engine)
Increase the amount of hydraulic oil supplied to the non-rod side chamber of the cylinder
There is a need. [0008] However, the above-mentioned power is fully utilized.
The maximum discharge rate at the maximum rotation of the pump mounted on the vehicle is
There is a limit, and further speedup cannot be expected. This
Supply of hydraulic oil to the non-rod side chamber of the hydraulic cylinder
Increase the amount efficiently and change the loading
Speed up the conversion operation to the falling state behind the chassis
There is a demand that they want to be On the other hand, the above-mentioned cargo handling frame falls down behind the chassis.
Pumps to speed up state conversion operations
If you make full use of the power to rotate the
Controversy, energy consumption increases and fuel economy is bad
Will have an effect. [0010] Such a situation is limited to the hydraulic cylinder.
Other fluid pressure cylinders such as air cylinders
Occurs as described above. The present invention has been made in view of the above points.
The purpose is to install empty containers.
Or loading of cargo handling frame without container
The conversion operation from the state to the lying state behind the chassis
It is to speed up. In addition,
To reduce noise and fuel consumption in the conversion operation
is there. [0012] To achieve the above object,
Therefore, the present invention is based on the
In the loading state, move the cargo handling frame from the
When converting to the lying state, the rod side fluid passage
The return fluid and part of the working fluid supplied to the opposite rod side chamber
It is intended to be used. More specifically, the present invention relates to a vehicle width
The container is rotatable around the direction axis, and the container is
A cargo handling frame to be loaded and unloaded to and from the ground,
Between the cargo handling frame and
Substantially horizontal mounting state with loading frame mounted on chassis
And the rear of the chassis that rotates toward the rear of the chassis
Hydraulic cylinders that convert to and from
Either the rod side chamber or the counter rod side chamber of the cylinder
Supply the working fluid to the other side, and expand and contract the above hydraulic cylinder
And a working fluid from the fluid pressure source.
Fluid passage and rod that communicate with the rod-side chamber
Switchable supply to the rod side fluid passage communicating with the side chamber.
In front of the cargo handling device for container handling vehicles
It is assumed. Then, the above-mentioned fluid pressure cylinder is
The loading frame is placed against the container's own weight
So that it is converted from the
Between the rod-side fluid passage and the non-rod-side fluid passage.
In the meantime, the return side of the rod side fluid passage is
Selectable for either passage side or tank side of fluid pressure source
Switching means for switching to communicate with the
Measures should be taken when empty containers are loaded or when no containers are loaded.
From the loading state by the cargo handling frame
When performing the conversion operation to the
Switch so that the fluid side communicates with the above-mentioned rod-side fluid passage.
This is a configuration that can be obtained. According to this particular matter, in the present invention, the full
When the container (container full of contents) is loaded
From the loading state by the cargo handling frame to the falling state behind the chassis
When performing the conversion operation, the hydraulic cylinder is extended.
The switching force is small because the upward component force (operating pressure) is small.
By switching the means to the tank side of the fluid pressure source,
Return fluid from the rod side chamber of the body pressure cylinder is
To the initial rotation state of the cargo handling frame.
Working fluid of working pressure required for dynamic operation (for example, maximum fluid pressure)
Is the anti-rod of the hydraulic cylinder through the anti-rod side fluid passage
It is supplied to the side room. In other words, whether the cargo handling frame is
The first hydraulic cylinder that rotates from the initial rotation
Working fluid with the maximum fluid pressure required for the initial extension operation is on the opposite rod side
Supplied to the opposite rod side chamber of the hydraulic cylinder through the fluid passage.
Will be. As a result, the cargo handling frame
Rotate smoothly from the mounted state against the antenna's own weight,
It is converted to a backward lying state. On the other hand, when an empty container is
At the time of loading, after the platform from the loading state by the cargo handling frame
When performing the conversion operation to the falling state, the engine
Making full use of force to extend the hydraulic cylinder
There is no need to use a maximum oil pressure,
By switching to the rod side fluid passage side, the fluid pressure source
Return fluid from the rod side chamber is added to the working fluid
You. [0016] Thereby, when the vehicle is mounted on the vehicle, the maximum rotation
Working fluid from a fluid pressure source that has a limited
With the return fluid from the pressure side chamber,
The supply volume of working fluid to the rod side chamber increases, and empty containers
Of the cargo handling frame when loading or when the container is not loaded
The conversion operation from the mounted state to the lying state behind the chassis
The layer speed can be increased. Note that this
In the case, the pressure receiving area difference between both end faces of the piston of the fluid pressure cylinder
In other words, depending on the cross-sectional area of the piston rod,
The pressure receiving area of the rod side chamber end face is the pressure receiving area of the rod side chamber end face.
Product, the operating pressure of the working fluid
As a result, the fluid pressure cylinder smoothly extends. Further, the power for driving the fluid pressure source is minimized.
Acting on the opposite rod side chamber of the fluid pressure cylinder by making the most of it
Operation from fluid pressure source without increasing fluid supply
Fluid pressure series with fluid and return fluid from rod side chamber
Supply of working fluid to the opposite rod side chamber of the
Therefore, even if the above power is reduced, the hydraulic cylinder can be extended.
Operation will be sufficiently ensured. For this reason,
By reducing the power, the burden of this power is reduced
The noise is reduced, noise measures are implemented, and energy
Energy consumption is reduced and fuel efficiency is improved.
Become. Moreover, the power is reduced to reduce the fluid pressure
Check the supply amount of working fluid to the rod
Working fluid from the maintained fluid pressure source and return from the rod side chamber
Work on the opposite rod side chamber of the hydraulic cylinder with
It is also possible to secure the supply amount of the moving fluid. This
When empty containers are loaded or when no containers are loaded
Change from the loading state of the cargo handling frame to the lying state behind the chassis
Speed up of the replacement operation and noise by reducing the power
It is also possible to satisfy all of the requirements and the reduction in fuel consumption. Embodiments of the present invention will be described below with reference to the drawings.
It will be described based on. FIG. 1 shows a container according to an embodiment of the present invention.
Shows a container handling vehicle equipped with a cargo handling device for cargo handling vehicles,
1 is a container cargo handling vehicle, 2 is a chassis of the container cargo handling vehicle 1
Left and right body frame 11 (only one in the figure)
(Shown). 3 is the above
Loading / unloading container 2 to / from each body frame 11
(A cargo handling device for a container handling vehicle).
The container 2 is moved by the cargo handling device 3
It is designed to be mounted on the body frame 11. Each of the container handling vehicles 1 has a vehicle body.
On the front end of each body frame 11 extending in the front-rear direction
A cab 12 is provided. Also, as shown in FIG.
On each body frame 11 behind the cab 12,
The right and left sides extending in the vehicle front-rear direction along the vehicle body frame 11
A pair of sub-chassis 13 is provided. Each of these
The sub-chassis 13 (each body frame 11) is
The length is such that the tener 2 can be mounted horizontally. So
Then, as shown in FIG. 1, the container 2
Mounted on each body frame 11 through the bus chassis 13
It is supposed to be. Further, each of the body frames 11
A jack 14 that can be extended is provided at the rear end,
Behind the vehicle body when loading / unloading containers 2 by loading / unloading device 3
Overhang the jack 14 to shift the center of gravity toward
To improve the stability of the container handling vehicle 1
are doing. The container 2 is shown in FIG. 1 and FIG.
As shown in the figure, the bottom of the
The bottom wall 2a is surrounded by front and rear walls 2b, 2b.
c and the left and right side walls 2d and 2e.
It is formed in a substantially rectangular parallelepiped shape that can accommodate
You. The lower surface of the bottom wall 2a of the container 2 is in front of the vehicle body.
A pair of left and right main girders 21 and 21 extending rearward (shown in FIG. 2)
Are provided integrally. In addition, the container 2
A hook portion 34d, which will be described later, is provided at the upper center position of the front wall 2b.
Is provided with an engagement pin 22 that releasably engages.
Then, as shown by a dashed line in FIG.
The rear wall 2c has upper ends at the rear ends of the left and right side walls 2d and 2e.
The upper part is supported around a shaft 23 extending in the vehicle width direction.
And can be opened backwards. In this case, the container
2 when the rear wall 2c is secured by a rear wall securing device (not shown).
The opening to the rear is regulated. The cargo handling device 3 is shown in FIGS.
The rear end of the sub-chassis 13
Rotatable around the first vehicle width direction axis 31 extending in the width direction
Connected and provided to be tiltable with respect to the sub-chassis 13
A pair of left and right tilting frames 32, 32 (shown in FIG.
), The base end is in contact with the front end of each tilting frame 32.
A second vehicle width direction axis 33 parallel to the first vehicle width direction axis 31;
(Axle in the vehicle width direction)
Cargo handling frame provided rotatably with respect to the moving frame 32
Arm 34 as a system and
Intermediate position, left and right sides, and front end of each sub-chassis 13
And a pair of left and right as a fluid pressure cylinder
And a lift cylinder 35. In addition,
At the rear end of the chassis 13, around the first vehicle width direction axis 31
A pair of left and right container guides rotatably supported on the container
Inner rollers 16, 16 (shown in FIG. 2) are provided.
You. The L-shaped arm 34 is provided as shown in FIG.
In the second vehicle width direction with respect to the front end of the tilting frame 32,
Each sub-chassis 1 is rotatably connected around an axis 33.
3, a base arm 34a extending forward on the front of
Slides back and forth with respect to the tip of
Base arm portion 34b,
A base end is integrally provided at a front end of the portion 34b.
Protruding arm bent upward from the tip of the
Arm portion 34c, and provided at the tip of this protruding arm portion 34c.
And can be disengaged from the engagement pin 22 of the container 2.
A substantially C-shaped hook portion 34d to be engaged with the base arm;
Connected between the arm portion 34a and the base arm portion 34b.
The base arm portion 34b is connected to the base arm portion 34a.
And extend and retract to move the protruding arm 34c forward and backward.
By doing so, the base arm portion 34b and the protrusion
Move the arm portion 34c to the forward position (the position indicated by the solid line in FIGS. 1 and 3).
Position) and the retreat position (in the direction of arrow Q in FIG.
Telescopic cylinder 37 for mutually changing the position
And The L-shaped arm 34 is
Each tilting frame 32 is maintained so as to extend substantially in a straight line.
Regulation that restricts rotation about the second vehicle width axis 33
A member (not shown) is provided. This regulating member is
Each tilting frame 3 according to the telescopic state of the telescopic cylinder 37
2 to restrict the rotation of the L-shaped arm 34 or its rotation.
It is configured to be released. Specifically, the regulating member
Is a telescopic cylinder as shown by a solid line in FIGS. 1 and 3.
37 is in the extended state, that is, the base arm portion 34a
The base arm 34b and the protruding arm 34c
When in the forward position, each tilting frame
The L-shaped arm 34 is held substantially linearly with respect to the
While restricting rotation around the vehicle width direction axis 33, the arrow in FIG.
As shown by the dashed line in the direction of mark Q,
When the holder 37 is in the contracted state, that is, when the base arm 3
4a, the base arm portion 34b and the protruding arm portion 34
When c is in the retracted position, each tilting
The rotation of the L-shaped arm 34 is restricted with respect to the front end of the frame 32.
Release and move the L-shaped arm 34 around the second vehicle width direction axis 33
It is made to rotate in the front-back direction. Each of the lift cylinders 35 is
Positions of base arm portion 34b and protruding arm portion 34c
Conversion, that is, rotation control of the L-shaped arm 34 by the control member
Telescopic actuation amount is set according to the presence or absence of
Has become. Specifically, each lift cylinder 35 is
When the rotation of the L-shaped arm 34 is restricted by the control member
Above, each tilt frame 32 is placed on each sub-chassis 13.
1 (FIG. 1 and FIG. 3).
State), and the L-shaped arm 34 is substantially
Each tilting frame 32 is held in a straight line and
By tilting around the vehicle width direction axis 31, each of the above tilts
A predetermined angle at which the moving frame 32 faces rearward from the mounted state.
(E.g., approximately 48 degrees).
The telescopic operation amount is set so that they are converted to each other.
You. Each of the lift cylinders 35 is
The restriction of rotation of the L-shaped arm 34 by the restriction member is released.
The sub-chassis 13
After the L-shaped arm 34 moves backward with respect to the moving frame 32,
The retracted placement state positioned at the retreat position (arrow Q in FIG. 3)
In the direction indicated by a dashed line) and the container 2
It is lowered to the ground behind each body frame 11 and
So that the hook portion 34d can be disengaged from the
The L-shaped arm 34 is in the second vehicle width direction with respect to the tilting frame 32
The rearwardly lying state rotated backward about the axis 33 (arrow in FIG. 3)
(Indicated by the two-dot chain line in the direction of mark S)
So that the telescopic operation amount is set. Next, the hydraulic circuit of the cargo handling device 3 will be described with reference to FIG.
Will be described. In this hydraulic circuit 41, the jack 14 is stretched.
Jack cylinder 42, lift cylinder 35
So that the telescopic operation of the telescopic cylinder 37 is performed.
I have to. In FIG. 4, reference numeral 43 denotes a publicly-known fluid pressure source.
Known constant displacement hydraulic pump, 44 is a fluid storage tank
All of the oil storage tanks,
The upstream end of the suction pipe 43a is opposed to the oil storage tank 44.
It is connected so that pressurized oil can flow. The hydraulic pump 43
Is driven by the power of an engine (not shown).
The increase or decrease of the oil pressure value or the increase or decrease of the discharge capacity of the 43
It is proportional to the force. A discharge port of the hydraulic pump 43 (shown in FIG.
No), the upstream end of the first pipe 45 is connected so that pressure oil can flow.
Have been. The first pipe 45 has the telescopic cylinder
Electromagnetic switching valve for telescopic cylinders that switches telescopic operation of 37
46, switching the expansion / contraction operation of the jack cylinder 42
Solenoid valve 47 for jack cylinder,
Lift cylinder that switches the expansion and contraction operation of the lift cylinder 35
The solenoid-operated directional control valve 48 is provided in series from the upstream side.
You. The downstream end of the first pipe 45 is upstream of the second pipe 49
The end is connected through a check valve 50 so that the pressure oil can flow therethrough.
You. The downstream end of the second pipe 49 is connected to the oil storage tank.
Connection to filter 44 via filter 51 so that pressure oil can flow
Have been. Each of the electromagnetic switching valves 46 to 48 is
Each consists of 6 port 3 position switching valve, all of which are medium
When it is switched to the upright position (the position shown in FIG. 4)
Indicates that the total amount of hydraulic oil sucked up by the hydraulic pump 43 is
Oil storage tank via first and second pipes 45, 49
The flow is returned to 44. The hydraulic pump 43 and the electromagnetic for the telescopic cylinder
In the middle position of the first pipe 45 located between the switching valve 46 and
Is connected to the upstream end of the third pipe 52 so that pressure oil can flow therethrough.
The downstream end of the third pipe 52 is the downstream end of the first pipe 45.
(Upstream end of the second pipe 49) so as to allow pressure oil to flow therethrough.
I have. The third pipe 52 has a work inside the first pipe 45.
Hydraulic oil pressure reaches maximum oil pressure (for example, 270 kgf / cm2)
A relief valve 53 that opens when the valve is opened is provided. This
The third pipe 52 downstream of the relief valve 53 of
The flow end is at each discharge port of each of the electromagnetic switching valves 46 to 48 (FIG.
Individually for the lower left port at each switching position shown in 4)
The other ends of the fourth pipes 54,.
It is connected so that it can be distributed. The hydraulic pump 43 and the telescopic cylinder
Of the first pipe 45 located between the solenoid valve 46 and the electromagnetic switching valve 46
The position (upstream end of the third pipe 52) is upstream of the fifth pipe 55
The end is connected so that pressure oil can flow. This fifth pipe 55
Downstream side corresponds to each of the electromagnetic switching valves 46 to 48 described above.
And the downstream ends of the respective branch pipes 55a to 55c are
The supply ports of the electromagnetic switching valves 46 to 48 (shown in FIG. 4)
Individually for each port (lower right port at each switching position)
Is connected via a check valve 56 so that pressure oil can flow therethrough. The solenoid-operated switching valve 47 for the jack cylinder described above.
Connects the downstream end of the branch pipe 55b through a sixth pipe 57b.
Pressure against the opposite rod side chamber 42a of the jack cylinder 42.
Oil supply is possible and the upstream end of the fourth pipe 54 is
The rod side of the jack cylinder 42 through the 7 pipe 58b
Jacquislin connected to chamber 42b so that pressure oil can be discharged
The extension operation position of the damper 42 (the left position shown in FIG. 4) and the above
The downstream end of the manifold 55b is jacked through a seventh pipe 58b.
Pressure oil can be supplied to the rod side chamber 42b of the cylinder 42
And connect the upstream end of the fourth pipe 54 to the sixth pipe 57b.
To the opposite rod side chamber 42a of the jack cylinder 42
On the other hand, the jack cylinder 42 connected to be able to discharge pressure oil
Between the retracted operating position (right position shown in FIG. 4) and the neutral position
They can be switched to each other. In addition, the above expansion and contraction
The cylinder electromagnetic switching valve 46 is located downstream of the branch pipe 55c.
The end is connected to the anti-lock of the telescopic cylinder 37 through the sixth pipe 57c.
And is connected to the pressure side chamber 37a so as to be able to supply pressure oil.
The upstream end of the pipe 54 is expanded and contracted via the seventh pipe 58c.
And is connected to the rod side chamber 37b of the
Extending position of the telescopic cylinder 37 (the left position shown in FIG. 4)
) And the downstream end of the branch pipe 55b is connected to the seventh pipe 58c.
Pressure oil to the rod side chamber 37b of the telescopic cylinder 37
And the upstream end of the fourth pipe 54 is connected to the sixth pipe.
The non-rod side chamber 3 of the telescopic cylinder 37 through the pipe 57c
7a of the telescopic cylinder 37 connected so as to be able to discharge pressurized oil
The contraction operation position (the right position shown in FIG. 4) and the neutral position
Can be switched to each other. The rod side chamber 4 of the jack cylinder 42
7b, a seventh pipe 58b connected to
Pipe 5 connected to the non-rod side chamber 42a of the solder 42
7b has check valves 59a, 59a, respectively.
A unit 59 is provided, and these check valves 59a, 59
a can flow backward due to pilot pressure from the sixth pipe 57b
From the rod side chamber 42b of the jack cylinder 42
The pilot oil from the seventh pipe 58b can be discharged
More reverse flow, that is, the opposite side of the jack cylinder 42 from the rod
It can be switched so that pressure oil can be discharged from the chamber 42a.
Swelling. Also, the anti-lock of the telescopic cylinder 37 is used.
The sixth pipe 57c connected to the pressure side chamber 37a has a check valve 6
0 is interposed, and the check valve 60 is connected from the seventh pipe 58c.
Back flow by the pilot pressure of
Is switched so that pressure oil can be discharged from the opposite rod side chamber 37a.
It has become so. The lift cylinder electromagnetic switching valve 48 includes:
The downstream end of the branch pipe 55a is
Pressure oil is supplied to the rod side chamber 35a through the sixth pipe 57a.
And the upstream end of the fourth pipe 54 is connected to each rifle.
The seventh pipe 58 is connected to the rod side chamber 35b of the
lift cylinder 35 connected to be able to discharge pressure oil via a
Extension operation position (right position shown in FIG. 4) and the branch pipe 5
The downstream end of 5a is connected to each lift cylinder via a seventh pipe 58a.
Connected to the rod side chamber 35b of the
And the upstream end of the fourth pipe 54 is connected via a sixth pipe 57a.
Pressure against the opposite rod side chamber 35a of each lift cylinder 35.
Shrinkage operation of each lift cylinder 35 connected to allow oil discharge
Position (left position shown in FIG. 4) and the neutral position
It can be switched. The sixth and seventh pipes
A counter balance valve 61 is interposed between 57a and 58a.
ing. In this case, the suction pipe 43a, the first pipe 45,
The fifth pipe 55 (branch pipe 55a) and the sixth pipe 57a
When the lift cylinder 35 is extended, the opposite rod side chamber 3
5a as hydraulic fluid passage on the opposite rod side for supplying hydraulic oil
Is formed as an oil passage 38 on the side opposite to the rod. On the other hand,
The seventh pipe 58a, the fourth pipe 54, the third pipe 52, and the second
The pipe 49 is closed when the lift cylinder 35 extends.
Rod-side fluid passage for returning the return oil from the pad side chamber 35b;
Is configured as a rod-side oil passage 39. The counter balance valve 61 and each
The sixth pipe 57 located between the lift cylinder 35 and the lift cylinder 35
a and the seventh pipe 58a,
The return side of the pipe 58a is connected to the sixth pipe 57a (each lift cylinder).
(The side opposite to the rod-side chamber 35a of the die 35) or the fourth pipe 54
Side (the oil storage tank 42 side of the hydraulic pump 43)
As switching means for switching to selectively communicate with
All the electromagnetic switching valves 64 are interposed. This electromagnetic switching valve
Numeral 64 is a three-port two-position switching valve, and the seventh piping
When the return side of 58a is switched to the sixth pipe 57a side
Sets the return side of the seventh pipe 58a to the sixth pipe 57a.
To the intermediate position of the
It is configured. More specifically, the electromagnetic switching valve 64
The rod side chamber 35b of the lift cylinder 35 is connected to the rod side oil passage 3
9 (the seventh pipe 58a) to the oil storage tank 44.
The tank communication position (the right position shown in FIG. 4)
The rod side chamber 35b of each lift cylinder 35 is
Anti-lock communicating with the oil passage 38 (sixth pipe 57a).
Selectively switch to the communication side of the door side (left position shown in FIG. 4)
It is configured in such a way. And of the seventh pipe 58a
When the return side is switched to the sixth pipe 57a,
The pipe 57a is communicated with the intermediate position through the connection path 62.
It is configured to: In this case, the electromagnetic switching valve 64
When switching to the tank communication position, the connection path 62 is shut off.
In addition, the seventh pipe 58a communicates. Meanwhile, anti
When switching to the rod side chamber communication position, the seventh pipe 58a
The downstream side of the electromagnetic switching valve 64 (the counter balance valve 61
Side) is shut off, and the return side of the seventh pipe 58a is connected to the connection path.
62 will be communicated. Also, as shown in FIG.
A remote controller 7 is provided in both cabs 12.
Have been. This remote controller 7 is a container
Loading / unloading switch 71 operated when loading / unloading 2
And a tilt switch 72 operated when the container 2 is tilted
And a jack switch 73 for raising and lowering the jack 14
When converting the L-shaped arm 34 to the lying state behind the chassis
Switch 74 for increasing the conversion speed of
I have. The loading / unloading switch 71 is a three-position switching type.
And the container 2 is connected via each sub-chassis 13
The container 2 mounted on each body frame 11
When lowering, the telescopic cylinder electromagnetic switching valve 46 is telescopic
Switch to the extension operation position of the da 37 and lift cylinder
The solenoid operated directional control valve 48 is moved to the position where the lift cylinder 35 is extended.
1st position to switch to container and container 2 from the ground to each car
When loading on the body frame 11
Switch the switching valve 48 to the contraction operation position of the lift cylinder 35.
Replace and contract the electromagnetic switching valve for telescopic cylinder 46
Operating between a second position for switching to a position and a neutral position.
You. The tilt switch 72 is of a three-position switching type.
And tilt the container 2 mounted on each body frame 11
When switching the solenoid valve 48 for lift cylinder
A first position for switching to the extension operation position of the cylinder 35;
When returning the antenna 2 to the horizontal state, the electromagnetic
Switching the switching valve 48 to the contraction operation position of the lift cylinder 35
The second position and the neutral position. Jacks
The switch 73 is of a three-position switching type.
When the cylinder 14 is extended, the solenoid-operated switching valve 47 for the jack cylinder is used.
To the extension operating position of the jack cylinder 42.
1 position and jacksill when storing jack 14
The solenoid switching valve 47 is operated to contract the jack cylinder 42.
Operating between a second position for switching to a position and a neutral position.
You. Further, the speed increasing switch 74 is of a two-position switching type.
There is a maximum hydraulic pressure that maximizes the power of the engine
When unnecessary, specifically, on each body frame 11
Empty containers (containers that do not contain stored items)
Mounted (the state shown in FIG. 1) or
No container is installed on the room 11
The L-arm 34 is placed in the mounted state (the state shown in FIG. 3).
When switching from the rearward to the rearwardly lying state, the electromagnetic switching valve 64 is
The speed increasing position for switching to the rod side chamber communication position and the
A full container (container full)
The L-shaped arm 34 is placed in a state where the tenor is mounted.
When changing from the state to the rearward lying state, the electromagnetic switching valve 64 is
It is operated to the normal position for switching to the tank communication position.
In this case, each of the switches 71 to 71 of the remote controller 7
The operation of 74 is a manual operation from inside the cab 12 by the driver.
This is done. Here, each body flare of the container cargo handling vehicle 1 is
Container mounted on the room 11 (each sub-chassis 13)
Describes the procedure for loading and unloading 2 from the ground
Bell. First, the vehicle is fully loaded on the body frame 11.
Drop the container (container full) onto the ground
Will be described. Prior to the container 2 unloading operation,
The overhang operation of the stick 14 is performed. Specifically, the remote
Operate the jack switch 73 of the controller 7 to the first position.
The solenoid valve 4 for the jack cylinder of the hydraulic circuit 41
7 is switched to the extension operation position (the left position shown in FIG. 4),
Hydraulic pump from oil storage tank 44 via suction pipe 43a
The hydraulic oil sucked up by the pump 43 is supplied to the first pipe 45, the fifth pipe
The pipe 55 (branch pipe 55b) and the sixth pipe 57b are sequentially passed.
To the opposite rod side chamber 42a of each jack cylinder 42
On the other hand, the rod side chamber 42b of each jack cylinder 42
Return oil from the seventh pipe 58b, the fourth pipe 54, and the third pipe 5
To the oil storage tank 44 through the second and second pipes 49 in order.
Discharge. Then, the jack 14 is in an extended state (FIG. 1).
Remote control when the
Switch the jack switch 73 of the roller 7 to the neutral position
The solenoid valve 47 for jack cylinder is set to the neutral position
Switch (center position shown by the solid line in FIG. 4)
14 is kept in an extended state. Next, the rear wall 2c is secured by the rear wall securing device.
After checking the binding, increase the speed of the remote
Switch 74 to the normal position, and
The switch 71 is switched to the first position. This allows the hydraulic
The electromagnetic switching valve 48 for the lift cylinder of the circuit 41 is extended.
Position (right position shown in FIG. 4). At this time, the electromagnetic switching valve 64 is connected to the tank
(Right position shown in FIG. 4).
Hydraulic pump from the oil storage tank 44 via the suction pipe 43a.
The hydraulic oil sucked up by the pump 43 is
The fifth pipe 55 (branch pipe 55a) and the sixth pipe 57a are sequentially arranged.
Through to the opposite rod side chamber 35a of each lift cylinder 35.
While being supplied, the rod side chamber 35 of each lift cylinder 35
The return oil of b is the seventh pipe 58a, the fourth pipe 54, the third pipe
52 and the second pipe 49 in order, and the oil storage tank 44
And all lift cylinders 33 begin to extend.
You. Thus, the initial state of each lift cylinder 35
Hydraulic oil of maximum hydraulic pressure required for extension operation, that is, L-shaped arm
34 from the contracted mounting state to the initial rotation state (each body frame
(In a state inclined about 15 ° with respect to 11)
Initial extension operation of each lift cylinder 35 (for example, maximum extension
The maximum necessary for the extension operation to approximately one-tenth of the amount)
Hydraulic hydraulic oil is supplied to each lift system via the non-rod side oil passage 38.
It will be supplied to the opposite rod side chamber 35a of the cylinder 35.
You. For this reason, the L-shaped arm 34 is initially moved from the contracted and mounted state.
When rotating to the rotating state, each lift cylinder 35
The upward component of the force (operating pressure) that causes the
Even if the electromagnetic switching valve 64 is switched to the tank communication position,
Oil that can be obtained by maximizing the power of the engine
The hydraulic oil of the maximum hydraulic pressure of the pressure pump 43 is supplied to each lift cylinder 3
5 is supplied to the non-rod side chamber 35a, and the L-shaped arm 34
Starts from the contracted loading state against the weight of the full container.
To smoothly rotate through the rotating state to the rearward lying state
Become. An empty core mounted on the body frame 11
A case where the antenna 2 is lowered on the ground will be described. Same as when dropping a full container on the ground
Then, the jack 14 is extended, and the jack 1 is moved.
After holding 4 in the overhanging state, after the rear wall securing device
After confirming the securing of the wall 2c, the remote controller 7
Switch 74 to the speed increase position,
The lowering switch 71 is switched to the first position. to this
Thus, the lift cylinder solenoid switching valve 48 of the hydraulic circuit 41
Is switched to the extension operation position, and the electromagnetic switching valve 6
4 moves from the tank communication position to the opposite rod side chamber communication position (see FIG. 4).
(Left position shown) and the oil storage tank 44
From the hydraulic pump 43 through the suction pipe 43a
For each hydraulic cylinder in the sixth pipe 57a,
Discharged from the rod side chamber 35b of the die 35 via the fourth pipe 54
Returned oil is added via connecting oil passage 62,
The amount is supplied to the opposite rod side chamber 35a of each lift cylinder 35
Will be done. As a result, since the vehicle is mounted on a vehicle,
Hydraulic oil from the hydraulic pump 43, which has a limited discharge amount,
With the return oil from the rod side chamber 35b, each lift system
The supply amount of hydraulic oil to the opposite rod side chamber 35a of the cylinder 35 is
Increases, the L-arm 34 contracts from the retracted mounted state,
To speed up the conversion operation
it can. The container 2 is mounted on the body frame 11
L-arm 34 contracts when not mounted
When performing the conversion operation from the placed state to the
Move the speed increase switch 74 of the remote controller 7 to the speed increase position.
Switch and set the loading / unloading switch 71 to the first position.
By changing to, for the lift cylinder of the hydraulic circuit 41
When the electromagnetic switching valve 48 is in the extension operation position and the electromagnetic switching valve 64 is
From the link communication position to the opposite rod side chamber communication position.
Is changed, and the L-shaped arm 34 falls backward from the contracted mounted state.
To further speed up the state conversion operation
Can be. In this case, the piston of each lift cylinder 35
The pressure receiving area difference between both end faces of
Therefore, the pressure receiving area of the end surface of the piston
Is larger than the pressure receiving area of the end face of the rod side chamber 35b.
Each lift cylinder 3
5 smoothly extends. The operation for driving the hydraulic pump 43 is also described.
Make full use of the force and anti-rod of each lift cylinder 35
Even if the supply amount of hydraulic oil to the side chamber 35a is not increased,
Hydraulic oil from pressure pump 43 and return from rod side chamber 35b
The opposite rod side chamber 3 of each lift cylinder 35 with oil
Since the supply amount of hydraulic oil to 5a increases, the power
Extension operation of each lift cylinder 35 is sufficient even if
Will be secured. For this reason, the power
Therefore, the burden of this power is reduced, and noise
To reduce noise and implement noise countermeasures.
Energy consumption can be reduced and fuel efficiency can be improved. Further, the above-mentioned power is slightly reduced so that each
Supply of hydraulic oil to the non-rod side chamber 35a of the cylinder 35
Hydraulic oil from the hydraulic pump 43 that has secured a certain amount;
Each lift cylinder is returned with return oil from the rod side chamber 35b.
Check the supply amount of hydraulic oil to the opposite rod side chamber 35a of the cylinder 35.
Can also be maintained. As a result, when empty container 2 is installed
Or contraction of the L-shaped arm 34 when the container is not loaded
Speed up the conversion operation from the placement state to the backward
And the reduction of noise and fuel consumption by reducing the power.
All can be satisfied. On the other hand, the container 2 on the ground is
1 When loading on top, that is, the L-shaped arm 34
When changing from the retracted state to the retracted
Switch 7 of the controller 7 to the second position.
And switch the speed-up switch 74 to the normal position.
I can. As a result, the lift cylinder electromagnetic switching valve 48
When it is switched to the contraction operation position (left position shown in FIG. 4)
In both cases, the electromagnetic switching valve 64 is switched to the tank communication position.
You. Then, the suction pipe 43a is removed from the oil storage tank 44.
The hydraulic oil sucked by the hydraulic pump 43 through the
1 pipe 45, 5th pipe 55 (branch pipe 55a) and 7th pipe
The rod side chamber of each lift cylinder 35 passes through the pipe 58a in order.
35b while the lift cylinder 35
The return oil of the pad side chamber 35a is supplied to the sixth pipe 57a and the fourth pipe 5
4, the oil is stored through the third pipe 52 and the second pipe 49 in this order.
It is discharged to the retaining tank 44 and each lift cylinder 35 contracts.
And the L-shaped arm 34 is converted to the contracted mounting state.
Then, the container 2 is returned to the mounted state on the body frame 11.
Will be. Thereafter, the storing operation of the jack 14 is performed.
Specifically, the electromagnetic circuit for the jack cylinder of the hydraulic circuit 41 is turned off.
Switching the switching valve 47 to the contraction operation position (right position shown in FIG. 4)
Oil from the oil storage tank 44 via the suction pipe 43a.
The hydraulic oil sucked by the pressure pump 43 is supplied to the first pipe 45,
The fifth pipe 55 (branch pipe 55b) and the seventh pipe 58b are sequentially arranged.
Through to the rod side chamber 42b of each jack cylinder 42.
On the other hand, the opposite rod side chamber 4 of each jack cylinder 42 is supplied.
The return oil of 2a is supplied to the sixth pipe 57b, the fourth pipe 54, and the third pipe.
An oil storage tank through a pipe 52 and a second pipe 49 in order.
Discharge to 44. Then, the jack 14 is in the stored state (FIG.
1 when the jack cylinder becomes
Switch the electromagnetic switching valve 47 to the neutral position, and
Is stored in the stored state. In the case of the above embodiment, the hydraulic pump 43
Variable displacement pump by applying a constant displacement pump
Simple and inexpensive pump itself
Can be very advantageous for implementation.
You. <Other Embodiments> The present invention relates to the above embodiment.
However, the present invention is not limited to the
Includes For example, in the above embodiment, the vehicle body
A place to drop a full container loaded on frame 11 to the ground
The speed-up switch 74 of the remote controller 7
Switched to the position, but the L-shaped arm contracted
From the mounted state to the initial rotation state (for each body frame 11
At about 15 °)
Switch the speed-up switch of the remote controller to the speed-up position
You may make it so. In this case, the L-shaped arm is rotated
If it rotates to the state, the initial extension operation of each lift cylinder
(For example, extension movement to about one-tenth of the maximum extension amount)
The hydraulic oil with the maximum hydraulic pressure required for
Detects that the L-shaped arm has rotated to the initial rotation state
Sensor that performs speed-up switching at the time of detection by this sensor.
If the switch is configured to switch to the acceleration position, the L-shaped
The conversion operation from the initial rotation state of the
Speed up even when the cup container is loaded
It becomes possible. Further, in the above embodiment, the fixed displacement hydraulic pressure
The pump 43 employs a fluid pressure pump with a large discharge capacity.
Pump, variable displacement pump or tandem pump
Of course, it may be possible. Further, in the above embodiment,
Applied a hydraulic cylinder as the lift cylinder 35
May be a hydraulic cylinder such as an air cylinder.
No. As described above, the container load according to the present invention is
According to the loading / unloading device for the working vehicle,
Is the loading state by the cargo handling frame when the antenna is not mounted?
When performing a conversion operation from the rear to the undercarriage, the rod side
Make the return side of the fluid passage communicate with the non-rod fluid passage side
By switching the switching means as described above, the operation from the fluid pressure source
The return fluid from the rod side chamber is added to the fluid
Increase the supply of working fluid to the opposite rod side chamber of the Linda
Let it. As a result, empty container
Loading frame when loading or when not loading container
Speeds up the conversion from the stationary state to the lying state behind the chassis
Can be up. Also, with the return fluid from the rod side chamber,
Increasing the supply of working fluid to the non-rod side chamber
Power to drive the fluid pressure source
Ensure sufficient supply of working fluid to the opposite rod side chamber
It is possible to reduce the power burden in this case.
Reduce noise and energy consumption
And the fuel efficiency can be improved. Further, the power is reduced to reduce the fluid pressure
Ensure that the supply of working fluid to the non-rod side chamber of the
Meanwhile, it is also possible to reduce the burden of the power,
In this case, the cargo handling frame may
Speed up conversion operation and reduce noise and fuel consumption
Can all be satisfied.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a container handling vehicle equipped with an unloading device according to an embodiment of the present invention in a state where an empty container is mounted. FIG. 2 is a plan view of the cargo handling device. FIG. 3 is a side view of the container cargo handling vehicle in a state where the container is not mounted. FIG. 4 is a hydraulic circuit diagram of the cargo handling device. FIG. 5 is a perspective view of a remote controller. [Description of Signs] 1 Container handling vehicle 2 Container 3 Cargo handling device (Container handling vehicle handling device) 11 Body frame (undercarriage) 33 Second vehicle width direction axis (Vehicle width direction axis) 34 L-shaped arm (Cargo handling frame) 35 Tilt cylinder (fluid pressure cylinder) 35a Non-rod side chamber 35b Rod side chamber 38 Non-rod side oil passage (non-rod side fluid passage) 39 Rod side oil passage (rod side fluid passage) 43 Hydraulic pump (fluid pressure source) 44 Oil storage tank (Tank) 64 Solenoid switching valve (switching means)

Claims (1)

Claims: 1. A cargo handling frame provided rotatably around a vehicle width direction axis with respect to a chassis, for loading and unloading containers between the chassis and the ground, and the chassis and the cargo handling frame. And a fluid that is mutually converted between a substantially horizontal mounting state mounted on the chassis and a lying state behind the chassis rotating toward the rear of the chassis by expansion and contraction. A pressure cylinder, and a fluid pressure source for supplying a working fluid to one of the rod side chamber and the non-rod side chamber of the fluid pressure cylinder to cause the fluid pressure cylinder to expand and contract, and the working fluid from the fluid pressure source is In the cargo handling apparatus for a container handling vehicle, the fluid pressure system is configured to be switchably supplied to an opposite rod side fluid passage communicating with the opposite rod side chamber and a rod side fluid passage communicating with the rod side chamber. The extending portion is arranged to convert the cargo handling frame from the loaded state toward the rearwardly sloping state side against the container's own weight by the extension operation, and the rod-side fluid passage and the non-rod-side fluid passage are connected to each other. Switching means for switching between the return side of the rod-side fluid passage and the tank side of the fluid pressure source is disposed between the rod-side fluid passage and the tank side of the fluid pressure source. When the container is loaded or the container is not loaded, when performing the conversion operation from the loading state by the cargo handling frame to the undercarriage rearward state, the return side of the rod-side fluid passage is communicated with the anti-rod-side fluid passage. A cargo handling device for a container handling vehicle, which is switched.