JPH02158431A - Safety device for dump-cum-vehicle truck - Google Patents

Abstract

PURPOSE:To make improvements in working safety by making a fully dumping operation effective only in the case where a fact that a locking device for locking a dump frame is in a locked state has been detected, in a truck capable of fully dumping the rear body and making itself shiftable in the longitudinal direction. CONSTITUTION:A tilting device 6 is installed in space between a car body 1 and a dump frame 2, and this dump frame 2 is tilted to some extent as specified by operation of this tilting device. In addition, a rear body 7 is mounted on the dump frame 2 in a longitudinally shiftable manner, and this rear body 7 is moved before and behind by operation of a sliding device 9. In this case, there is provided with a locking device 12 for locking the rear body 7 to the dump frame 2 when being used as a dump truck. This locking device is constituted so as to cause a hook 14 to be engaged with an engaging piece 13 when a control lever 15 is rotated forward and to lock the rear body 7 to the dump frame 2. Supposing that this locked state is detected by a first detector 19, operation of the tilting device 6 is allowed at the time of detection of the locked state.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Field of Application The present invention is utilized in the field of a dump vehicle/vehicle transport vehicle that is capable of fully dumping a cargo platform and also capable of moving forward and backward.

(b) Conventional technology Conventional dump/vehicle carriers are equipped with a locking device between the dump frame and the loading platform, and when used as a dump truck, the locking device is locked and the loading platform is fully dumped together with the dump frame. When used as a vehicle transport vehicle, the vehicle is loaded and unloaded by releasing the locking device, tilting the dump frame at a predetermined angle, and then moving the loading platform back and forth.

(C) Problems to be Solved by the Invention However, in the above structure, the locking device must be switched between locking and unlocking according to each work.
In particular, when using a dump truck, if you forget to switch the locking device to the locked state and perform a full dump, there is a danger that the loading platform may fall from the dump frame and injure the operator.

The present invention was made to solve the above-mentioned problems.
The object of the present invention is to provide a safety device for a dump vehicle/vehicle carrier in which a locking device is provided with a lock detecting means, and a full dumping operation can be performed only when the lock detecting means detects a locked state.

(d) Means for Solving the Problems The present invention solves the above-mentioned problems by mounting a dump frame on the vehicle body, providing a loading platform on the dump frame, and making it possible to fully dump the loading platform together with the dump frame. In a dump vehicle that can move the loading platform back and forth after tilting the dump frame at a predetermined angle, a locking device for fixing the loading platform to the dump frame is provided between the dump frame and the loading platform, and a locking device for fixing the loading platform to the dump frame is provided. A lock detection means is installed nearby to detect the lock state.
This is a safety device for a dump vehicle/vehicle transport vehicle which is provided with a control device that enables a full dump operation of the loading platform only in the locked state detected by the lock detecting means.

(e) Operation When used as a dump truck, the locking device is put into a locked state to fully dump the loading platform together with the dump frame.

Note that even if you forget to set the lock state and perform a full dump operation, the control device does not enable the full dump operation to avoid the danger of the platform falling.

When the vehicle is used as a vehicle carrier, the lock device is unlocked, the loading platform is tilted at a predetermined angle, and the loading platform is then moved back and forth to load and unload the vehicle.

(f) Example The following example will be explained with reference to the drawings. (1) is a vehicle body, a dump frame (2) is mounted on the vehicle body (1), and the dump frame (2) is mounted on the vehicle body (1). ) and a hinge bracket (4) fixed to the dump frame (2).

A tilting device (6) having a dump cylinder (5) is provided between the vehicle body (1) and the dump frame (2),
The dump frame (2) is tilted by this tilting device (6).

A loading platform (7) is mounted on the dump frame (2) so as to be movable back and forth, and a slide device (9) having a slide cylinder (8) provided between the dump frame (2) and the loading platform (7) The loading platform (7) can be moved back and forth. A sliding door (10) for the front of the sliding board is provided at the rear of the loading platform (7), and supporting legs (11) for the loading platform are provided vertically at the rear.

(12) is a locking device for fixing the loading platform (7) to the dump frame (2) when used as a dump truck;
As shown in FIGS. 4 and 5, the locking device (12) has an engaging piece (13) fixed to the dump frame (2), and a hook (14) that engages with the engaging piece (13). The loading platform (7
), and on the other hand, an operating lever (15) is rotatably provided on the loading platform (7), and this operating lever (15) and the hook (
14) and each arm (16)..., each rondo (17)
... and the loading platform (7) are connected via a shaft (18) supported by the loading platform (7), and the operating lever (15) is connected to the loading platform (7).
7) When rotated forward, the hook (14) will engage the engagement piece (13).
), the loading platform (7) is locked to the dump frame (2), and when the loading platform (7) is rotated rearward, the lock is released.

Next, various detectors will be explained with reference to FIGS. 4 and 5. (19) is a first detector, and the first detector (19) detects the locked state of the locking device (12). It is attached to the engaging piece (13) via the bracket (20), and the regulating plate (21) protrudes from the hook (14) so that it is "connected" when locked and "disconnected" when unlocked. ing.

(22) and (23) are a second detector and a third detector for detecting the tilt angle of the dump frame (2), and both detectors (22) and (23) are fixed to the hinge shaft (3). The dump frame (2) is attached to a mounting member (24), and the dump frame (2) is detected by coming into contact with the dump frame (2).

In particular, the second detector (22) becomes "contact" when the loading platform slides at the lower limit angle (approximately 8 degrees) or more, and the third detector (23)
If the angle exceeds the upper limit angle (approximately 20 degrees), a break will occur.

(25) is a fourth detector attached to the dump frame (2), and the fourth detector (25) is in contact with the bracket (26) on the vehicle body (1) side to indicate the tilting state of the dump frame (2). It is designed to be "off" only when the dump frame (2) is not tilted (angle 0 degrees).

To explain the hydraulic circuit using Fig. 6, the hydraulic pump (27)
From dump cylinder (5) and slide cylinder (8)
Pressure oil is supplied to the cylinder, the slide cylinder (8) expands and contracts by operating the first switching valve (28), and the dump cylinder (5) expands and contracts by operating the second switching valve (29). There is.

In addition, the first switching valve (28) is a solenoid 5OLA1.5O.
It is designed to be switched by LBI, and the slide cylinder (8) extends when the solenoid S leaf ^1 is energized, and the slide cylinder (8) contracts when the solenoid 5OLB1 is energized. .

The second switching valve (29) is also a solenoid 5OLA2.5OLB
2, the dump cylinder (5) extends when the solenoid S 2 is energized, and the dump cylinder (5) contracts when the solenoid 5OLB2 is energized. .

The electric circuit will be explained with reference to FIG. 7. A main switch (31) and a select switch (32) are provided on a main circuit (30).

The main switch (31) is provided in the driver's cab (33) and can also be used as an engine switch.

The select switch (32) is provided in the driver's cab (33) and is capable of selecting between the dump work circuit (34) and the slide work circuit (35).

The dump work circuit (34) is provided with a first detector (19) and a dump switch (37) which is a switch device (36) for dump work installed in the driver's cab (33). ), the raising circuit (38) is connected to solenoid 5OLA2, and the lowering circuit (39) is connected to the fourth detector (
25) to the solenoid 5OLB2.

The slide work circuit (35) is provided with a slide work switch device (40) attached to the side of the vehicle body (1), and from a dump switch (41), which is one of the switch devices (40), An auxiliary raising circuit (42) with a third detector (23) interposed therebetween is connected to the raising circuit (38).

Further, an auxiliary lowering circuit (43) in which a first detector (19) and a second detector (22) are provided in parallel is connected to the lowering circuit (39).

The switch device (40) is provided with another slide switch (44), and from the slide switch (44), an extension circuit (45) is connected to the solenoid 5OLA1, and a contraction circuit (46) is connected to the solenoid 5OLBI.

Also, before the slide switch (44) is a second detector (
22) and an alarm circuit (48) provided with a buzzer (47) is branched off.

In the embodiment, the locking device is operated manually, but it may also be configured so that when the loading platform reaches the forwardmost position, it comes into contact with a regulating member on the dump frame side and automatically enters the locked state. It is possible.

The present invention has the above-mentioned structure, and its operation will now be explained. When used as a dump truck, first move the operating lever (15) of the locking device (12) to the front of the loading platform (7) as indicated by the dotted chain line in Figure 5. to lock the loading platform (7) to the dump frame (2).

Incidentally, the above-mentioned work can also be carried out after the use of the vehicle as a transport vehicle is completed.

Afterwards, press the main switch (31) inside the driver's cab (33).
After setting the select switch (32) to the dump work circuit (34) side, turn the dump switch (36
) is raised and connected to the circuit (37).

Since the first detector (19) is "closed", the solenoid 5OLA2 is energized, the second switching valve (29) is switched off, the dump cylinder (5) is extended, and the loading platform (7) is moved to the dump frame ( 2) and dump it together.

At that time, if the locking device (12) is not in the locked state, the first detector (19) is "off" and the solenoid 5OLA2 is not energized, making it impossible to dump the loading platform (7). It looks like this.

When lowering the loading platform (7), press the dump switch (36).
) is lowered and connected to the circuit (38), the solenoid SO
[82 is energized, the second switching valve (29) is switched, the dump cylinder (5) is contracted, and the loading platform (7) is lowered.

When the loading platform (7) is in the retracted state, the fourth detector (25) indicates "
” and the power to the solenoid 30182 is cut off.

Next, when using it as a vehicle transport vehicle, first
33), set the select switch (32) to the slide working circuit (35) side, then go out to the side of the vehicle body (1) and turn the operating lever (15) of the locking device (12) to the Rotate the loading platform (7) rearward as shown by the solid line in Figure 5 and lock the locking device (1).
2) is released as shown in Figure 4.

Thereafter, the dump switch (40) of the slide operation switch device (39) is connected to the auxiliary lifting circuit (41).

The third detector (23) on the auxiliary raising circuit (41)
Since it is connected, solenoid 5OLA2 is energized,
The second switching valve (29) is switched, the dump cylinder (5)
extends, and the loading platform (7) tilts.

When the loading platform (7) approaches the upper limit angle (approximately 20 degrees) as determined by the operator's eye, the dump switch (40) is turned off to stop the tilting.

At that time, the worker's visual estimation was incorrect and the dump switch (40
) remains at 1 contact, when the dump frame (2) reaches the upper limit angle, the third detector (23) becomes 1 disconnection, the solenoid 5OLA2 is no longer energized, and the loading platform (7
) will automatically stop tilting.

After stopping the tilting, the slide switch (43) is turned to the extension circuit (44) side.

The solenoid 5O is connected by the "connection" on the extension circuit (44) side.
The LAI is energized, the first switching valve (28) is switched, the slide cylinder (8) is extended, and the loading platform (7) moves backward on the dump frame (2).

The above operation is performed when the lower limit angle of the predetermined angle (approximately 8 degrees) is exceeded, and when the lower limit angle is below the second detector (22).
Since the solenoid 5OLA1 is permanently connected, the solenoid 5OLA1 is not energized and the backward movement of the loading platform (7) can be restricted.

This makes it possible to avoid a situation in which the support legs (11) do not touch the ground when the loading platform (7) is at the rearmost position.

After the loading platform (7) moves to the rearmost position, open the sliding door (as shown in Figure 2).
10) and load the vehicle onto the loading platform (7).

In addition, if the loading platform (7) reaches the lower limit angle or more, the alarm circuit (47)
) will also be energized and a buzzer (46) will sound, alerting those around you that loading and unloading of vehicles is about to begin.

When the loading and unloading of the vehicle is completed, the fan door (10) is closed from the state shown in FIG. 2, and the slide switch (43) is connected to the retraction circuit (45) to energize the solenoid 5QLB1.

The first switching valve (28) is activated by energizing solenoid 5OLBI.
is switched, the slide cylinder (8) contracts and the loading platform (
7) Move forward.

After the loading platform (7) has moved to the frontmost position (dashed line in Figure 2), rotate the operating lever (15) of the locking device (12) forward of the loading platform (7) to move the loading platform (7) to the dump frame (2). is locked and the first detector (19) is brought into contact.

In this state, switch the dump switch (40) to the auxiliary lowering circuit (4
2) When set to "contact", the solenoid 30182 is energized to contract the dump cylinder (5) and lower the loading platform (7) to the state shown in FIG.

At that time, if the angle of the loading platform (7) becomes below the lower limit angle, the second
The detector (22) becomes "off", but the first detector (19)
Since it is "connected", it is possible to maintain the energized state to the solenoid 5OLB2.

(g) Effects of the Invention As described above, the present invention provides a locking device for integrating a loading platform into a dump frame, and also includes a lock detection means for detecting a locked state, and when the lock detection means detects a locked state. Since the full dump operation of the loading platform is enabled only when the truck is used as a dump truck, it is possible to reliably avoid the danger of the loading platform falling when used as a dump truck, and work safety can be ensured.

[Brief explanation of the drawing]

Figure 1 is an overall view of the dump/vehicle carrier, Figures 2 and 3 are operating state diagrams, Figure 4 is a partially enlarged view, and Figure 5 is the
Figures AA and 6 are hydraulic circuit diagrams, and Figure 7 is an electrical circuit diagram. (1) is the vehicle body, (2) is the dump frame, (7) is the loading platform, (12) is the locking device, and (19) is the first detector. Applicant: Kyokuto Kaihatsu Kogyo Co., Ltd. Figure 206-1

Claims (1)

[Claims] In the dump-cum-vehicle transport vehicle, which is equipped with a dump frame on the vehicle body, a loading platform is provided on the dump frame, the loading platform can be fully dumped together with the dump frame, and the loading platform can be moved back and forth after tilting the dump frame at a predetermined angle. A locking device for fixing the loading platform to the dump frame is provided between the dump frame and the loading platform, and a locking detection means for detecting a locked state is provided near the locking device, and the locking state detected by the locking detector is provided. A safety device for a vehicle transport vehicle that also serves as a dumper and is equipped with a control device that enables full dumping of the loading platform only when the vehicle is in use.