JPS6218510Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tightening device for a container handling vehicle.

In general, a container cargo handling vehicle has a tilt frame mounted on the chassis of the container cargo handling vehicle so that it can be pushed down, and a winch installed in advance on the front end of the tilt frame is wound and driven to pull up the container onto the tilt frame. That's what I do. In this type of container handling vehicle, in order to prevent the container from falling from the tilt frame, a fall prevention hook is provided on the side of the tilt frame, and this hook is hooked onto a lock pin on the container side. The engagement of the hook with the lock pin prevents the container from sliding along the tilt frame when the tilt frame is tilted. In order to engage the above-mentioned hook with the lock pin on the container side, it is important to correctly regulate the relative position of the two, and if the timing of the closing operation of the hook is too early, the hook will collide with the lock pin. Also, since there is a manufacturing error in the mounting position of the lock pin on the container side,
There was a problem that the hook engaging operation lacked reliability.

Therefore, the purpose of the present invention is to provide a tightening device for a container handling vehicle that detects the loading position of the container on the tilt frame and then performs the closing operation at a time lag using a timer circuit to ensure reliable hooking. It's about doing.

In order to achieve the above object, the present invention provides a lock pin on the side of the container to be loaded and unloaded on the tilt frame of a container cargo handling vehicle, and uses a lock cylinder device on the tilt frame side to lock the container between the lock position and the unlock position. A hook that can be moved is provided, and a position detection plate is provided on the container side, and the detection plate closes a loading confirmation switch to confirm the container loading position, wherein the loading confirmation switch A delay timer is built in series between the output terminal of the lock cylinder device and the solenoid of the lock cylinder device, and the hook is moved in the lock direction after a predetermined delay time.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tightening device for a container cargo handling vehicle according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a cab-over type container handling vehicle. A subframe 2 is fixed on the chassis 1 of this vehicle, and a pair of brackets 3, 3 are mounted on both sides of the subframe 2 near the rear end of the vehicle. are fixed, and a tilt frame 4 is pivotably supported by a pin 3a to these brackets 3, 3 so as to be able to be depressed. The tilt frame 4 is tilted so as to be able to be depressed by a dump cylinder device 5 incorporated between the sub-frame 2 and the tilt frame 4 as shown in the figure.

A winch 6 is installed near the front end of the tilt frame 4, and this winch 6 has a winding drum rotated by a hydraulic motor, which will be described later. The latch 8 can be engaged with a hook 10 on the front panel of the container 9.

A lock pin 11 for preventing the container from falling is fixedly attached to the front lower part of the container 9, and a hook 1 pivotably supported by a shaft 12 toward the tilt frame side is attached to the lock pin 11.
4 can be engaged and disengaged. This hook 1
4 has a hook portion 14a that opens toward the front, and can be opened and closed by a spring S and a hydraulically operated lock cylinder device 15.

On the other hand, a position detection plate 16 is protruded from the center lower part of the container 9, and when the container 9 is pulled up on the tilt frame 4 and loaded into the proper position, the detection plate 16 confirms the loading. The switch 17 is closed.

Next, a hydraulic circuit for driving the above-mentioned dump cylinder device 5, winch 6 and lock cylinder device 15 will be explained with reference to FIG.

The head 5a side and the rod 5b side of the dump cylinder device 5 are connected to the _A1 port and the _B1 port of the dump switching valve 20 via pipes 18 and 19. Further, the rod 15a side and the head 15b side of the lock cylinder device 15 are connected to the pipe line 2.
1 and 22 to the _A2 port and _B2 port of the lock switching valve 23. Furthermore, the hydraulic motor of the winch 6 is connected to the pipes 24 and 2.
5 to the _A3 port and _B3 port of the winch switching valve 26. The dump switching valve 20, lock switching valve 23, and winch switching valve 26 are center bypass type 4-port 3-position switching valves, and each port position can be switched by energizing a solenoid a or b. It's summery.

Further, a pressure oil supply pipe 28 is connected to the discharge port of the hydraulic pump 27, and the pressure oil supply pipe 28 is connected to the P port and the T port of each switching valve 20, 23, and 26 in series. , is connected back to the oil tank 29. Further, from the middle of the inlet side pipe 24 of the hydraulic motor 6, a drain pipe 31 having a relief valve 30 arranged on the pipe is branched out to the drain side. Further, the downstream side of the relief valve 30 of the drain pipe 31 and the head side of the lock cylinder 15 are connected by a pipe 32, on which a cam operated valve 33 is installed. This cam operated valve 33 is mounted on the tilt frame 4 and is configured to switch ports by a detection cam 34 provided on the container 9, so that the container 9 is in the normal locking position on the tilt frame 4. Otherwise, port A ₄ and port T ₄ are in communication and in an unloaded state.

Next, electric circuits for controlling various switches and solenoids of switching valves will be explained with reference to FIG.

In Figure 3, SOLa ₁ , SOLb ₁ , SOLa ₂ , SOLb ₂ ,
SOLa ₃ and SOLb ₃ indicate solenoids for operating the dump switching valve 20, lock switching valve 23, and winch switching valve 26 in FIG.

This electric circuit includes a power source 35, an engine key 3
6. The positive bus bar 39 on the left side of the figure where the fuse 37 and main switch 38 are connected in series.
Various switches are connected in parallel between the negative side bus bar 40 on the right side in the figure and the grounded negative side bus bar 40 on the right side in the figure.

A conductor 41 is inserted between the positive bus bar 39 and the negative bus bar 40 between the fuse 37 and the main switch 38, and a lock confirmation switch 42, a container loading position confirmation switch 17, and a hook 14 are connected.
An unlock pilot lamp 43 is connected in series to indicate that the lock is open.

A main power pilot lamp 45 is connected to the bus bar 39 on the output contact side of the main switch 38 via a conductive wire 44 to indicate that the main switch 38 is closed.

Further, the a-contact point of a left tilt frame position confirmation switch 47L is connected to the bus bar 39 via a conductive wire 46. The a contact of this switch 47L has a hook switch 48 that opens and closes the hook 14,
A wire winding switch 49 and a wire rewinding switch 50 are connected in parallel. The opening contact O of this hook switch 48 is connected to a solenoid SOLa ₂ that opens the hook 14, while the closing contact C is connected to a solenoid SOLa 2 that closes the hook 14.
Connected to SOLb ₂ . The output side contact of the wire hoisting switch 49 causes the winch 6 to hoist.
SOLa ₃ , while the output contact of the wire rewind switch 50 rewinds the winch 6.
Connected to SOLb ₃ .

Further, a winch 52 is connected to the bus bar 39 via a conductive wire 51 for switching winding and rewinding of the winch 6 . The rewind side contact D of this winch switch 52 includes a normally open wire detection switch 53, a normally closed container guide left switch 54L, a container guide right switch 54R, a b contact of a tilt frame position confirmation left switch 47L, and a lock open confirmation switch. 55 are connected in series. and,
The b contact of the lock open confirmation switch 55 is connected to SOLa ₂ , and the a contact of the lock open confirmation switch 55 is connected to SOLb ₃ .

In addition, the winding side contact U of the winch switch 52
has a normally closed container guide left switch 54L,
A container guide right switch 54R and a SOLa ₃ for hoisting the winch 6 are connected in series. In addition, the b contact of the tilt frame position confirmation right switch 47R is connected in parallel with this SOLa ₃ , and the normally open container loading position confirmation switch 17 is connected to the b contact of this switch 47R. A delay timer 60, which constitutes the essential part of the present invention, is connected to the output terminal of 17, and the output terminal of this timer and SOLb ₂ , which closes the hook 14, are connected in series. As this timer, an electronic timer that utilizes the charging and discharging characteristics of a capacitor is desirable.

Further, a dump switch 56 for switching the dump state of the tilt frame 4 is connected to the bus bar 39. A normally closed left lock confirmation switch 57 and a SOLa ₁ for dumping the tilt frame 4 are connected in series to the up contact U of the dump switch 56. The b contact of the container loading position confirmation switch 17 is connected in parallel to the left lock closure confirmation switch 57. On the other hand, dump switch 56
SOLb ₁ , which releases the dump of the tilt frame 4, is connected to the lowering contact D of the tilt frame 4.

Since the present invention is configured as described above, when loading the container 9, the dump switch 56 is
the contact side, energize the SOLa ₁ to tilt the tilt frame 4 as shown by the chain line in FIG. When the switch 52 is switched to the winding side contact U and the SOLa ₃ is energized, the hydraulic motor rotates in the winding direction, and the container 9 can be pulled up along the upper surface of the tilt frame 4.

When the detection plate 16 on the container side closes the loading confirmation switch 17, the delay timer 6
0 starts operating and after a predetermined delay time elapses.
SOLb ₂ is activated. Then, the pressure oil from the hydraulic pump 27 passes through port P ₂ and port B ₂ and enters the pipe line 22.
The lock pin 11 is then guided to the head 15b of the lock cylinder device 15, and the hook 14 is rotated counterclockwise in the drawing to lock the lock pin 11. At this time, the cam operated valve 33 is switched to the blocked position, and ports A ₄ and P ₄ are communicated and blocked, so that the hydraulic pressure acting on the head side of the lock cylinder device 15 is sufficiently established. .

As described above, according to the present invention, after the containers stacked on the tilt frame reach the loading position, the locking device moves the hook in the locking direction after a predetermined delay time has elapsed. Even if there are errors, all containers can be reliably locked.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a container cargo handling vehicle to which the present invention is applied, FIG. 2 is a hydraulic circuit diagram of the container cargo handling vehicle, and FIG. 3 is an electrical circuit diagram showing an embodiment of the present invention. 4...Tilt frame, 9...Container, 11
... Lock pin, 14 ... Hook, 15 ... Lock cylinder device, 16 ... Detection plate, 17 ...
...Loading confirmation switch, 60...Delay timer.

Claims (1)

[Scope of utility model registration request] While a lock pin is provided on the side of the container that is loaded and unloaded on the tilt frame of the container handling vehicle,
A hook is provided on the tilt frame side to be moved between a locking device and an unlocking position by a lock cylinder device, and a position detection plate is further provided on the container side, and this detection plate closes a loading confirmation switch. Accordingly, in a device for confirming the container loading position, a delay timer is installed in series between the output terminal of the loading confirmation switch and the solenoid of the switching valve that operates the lock cylinder device, and a predetermined delay time is set. A tightening device for a container cargo handling vehicle, characterized in that the hook is moved in the locking direction when the container is moved.