JPH06102418B2 - Safety device for a vehicle that also serves as a dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is used in the field of a vehicle that can serve as a dump truck and is capable of full dumping and also moving in the front-rear direction.

(B) Conventional technology In a conventional vehicle for a vehicle that also serves as a dump truck, a lock device is provided 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 the vehicle is used as a vehicle, the lock device is unlocked and the dump frame is tilted by a predetermined angle, and then the loading platform is moved back and forth to load and unload the vehicle.

(C) Problems to be Solved by the Invention In the above structure, the locking device must be switched to lock or unlock according to each work,
Especially when using as a dump truck, if you forget to switch the lock device to the locked state and do a full dump, there is a risk that the platform will drop from the dump frame and injure the operator. The present invention has been made to solve the above-mentioned problem, and its purpose is to provide a lock detecting means in a lock device so that a full dump operation can be performed only when a lock state is detected by the lock detecting means. A safety device for a vehicle carrier is provided.

(D) Means for Solving the Problem The present invention is to solve the above-mentioned problems, and a dump frame tilted by a tilting device is mounted on a vehicle body and is slid on the dump frame by a slide device. In a vehicle carrier that also serves as a dump truck, in which a cargo bed can be fully dumped together with the dump frame and the dump frame can be slid back and forth after tilting the dump frame by a predetermined angle, a dump frame is provided between the dump frame and the cargo bed. A lock device for fixing the load carrier is provided, and a select switch for arbitrarily selecting a dump work circuit that enables a full dump operation of the platform and a slide work circuit that enables a slide operation of the platform is provided, Includes a dump switch for tilting operation and a first detector for detecting the lock state of the lock device, In the slide work circuit, a dump switch for tilting operation and a slide switch for slide operation are provided in parallel, and a third detector for detecting that the loading platform has exceeded a predetermined angle is provided in series with the dump switch. When the first detector detects that the lock device is locked during selection, the dump switch raising operation becomes valid, and when the slide work circuit is selected, the dump switch raising operation becomes valid and the loading platform tilts by a predetermined angle or more, the third detector The present invention relates to a safety device for a vehicle that also serves as a dump truck, which is provided with a control device that restricts further tilting by detection.

(E) Operation When used as a dump truck, the lock device is locked and the platform is fully dumped together with the dump frame. It should be noted that even if the user forgets to set the lock state and performs a full dump operation, the control device does not validate the full dump operation and avoids the risk of dropping the cargo bed.

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

(F) Embodiment An embodiment will be described below with reference to the drawings. 1 is a vehicle body, and a dump frame 2 is mounted on the vehicle body 1. The dump frame 2 is a hinge shaft 3 fixed to the vehicle body 1 and a dump truck. It is tiltably supported via a hinge bracket 4 fixed to the frame 2.

A tilting device 6 having a dump cylinder 5 is provided between the vehicle body 1 and the dump frame 2, and the tilting device 6 can tilt the dump frame 2 to a full dump (about 55 degrees).

A loading platform 7 is mounted on the dump frame 2 so as to be movable back and forth, and the loading platform 7 is moved back and forth by a slide device 9 having a slide cylinder 8 provided between the dump frame 2 and the loading platform 7. . On the rear side of the luggage carrier 7, there is provided a door 10 that also serves as a play plate, and a luggage carrier support leg 11 is vertically provided on the rear portion.

Reference numeral 12 is a lock device for fixing the loading platform 7 to the dump frame 2 when it is used as a dump truck, and preventing the loading platform from dropping by its own weight at the time of full dump.
As shown in FIG. 5 and FIG. 5, the engaging piece is attached to the dump frame 2.
13 is fixed, and the hook 14 engaging with the engaging piece 13 is attached to the loading platform 7
On the other hand, an operating lever 15 is rotatably provided on the loading platform 7, and the operating lever 15 and the hook 14 are connected to the arms 16 respectively.
..., each rod 17, ... and a shaft 18 supported by the carrier 7, and when the operating lever 15 is rotated forward of the carrier 7, the hook 14 engages with the engaging piece 13 to cause the carrier 7 to rotate. Is locked to the dump frame 2, and the lock is released by rotating the dump frame 2 rearward.

Next, various detectors will be described with reference to FIGS. 4 and 5. Reference numeral 19 denotes a first detector, which detects the locked state of the lock device 12, and the engaging piece 13 It is attached via a bracket 20 to the control plate 21 protruding from the hook 14 so as to be "contacted" when locked and "disconnected" when unlocked.

Reference numerals 22 and 23 denote a second detector and a third detector for detecting the tilting angle of the dump frame 2. The both detectors 22 and 23 are attached to a mounting member 24 fixed to the hinge shaft 3, The detection is made by contacting the two. In particular, the second detector 22 becomes "contact" when the lower limit angle (about 8 degrees) of the predetermined angle at which the platform can be slid is "contact", and the third detector 23 "breaks" when the upper limit angle (about 20 degrees) is exceeded. It is supposed to be.

Reference numeral 25 is a fourth detector attached to the dump frame 2. The fourth detector 25 is for contacting a bracket 26 on the vehicle body 1 side to detect the tilted state of the dump frame 2, and the dump frame 2 is not tilted. It is designed to be "off" only at the time (0 degree angle).

The hydraulic circuit will be described with reference to FIG. 6. Pressure oil is supplied from the hydraulic pump 27 to the dump cylinder 5 and the slide cylinder 8, the slide cylinder 8 expands and contracts by the operation of the first switching valve 28, and the second switching valve 29. The dump cylinder 5 is adapted to expand and contract by the operation.

The first switching valve 28 can be switched by solenoids SOLA1 and SOLB1, so that the solenoid cylinder SOLA1 is energized to extend the slide cylinder 8 and the solenoid solenoid SOLB1 is energized to contract the slide cylinder 8. Has become. The second switching valve 29 is also designed to be switched by the solenoids SOLA2 and SOLB2. When the solenoid SOLA2 is energized, the dump cylinder 5 is expanded, and when the solenoid SOLB2 is energized, the dump cylinder 5 is contracted. ing.

The electric circuit will be described with reference to FIG. 7. A main switch 31 and a select switch 32 are provided on the 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 cab 33 so that the dump work circuit 34 and the slide work circuit 35 can be selected.

The dump work circuit 34 is provided with the first detector 19 and a dump switch 37 which is a dump work switch device 36 mounted in the cab 33.
38 is connected to the solenoid SOLA2, and the lowering circuit 39 is connected to the solenoid SOLB2 via the fourth detector 25.

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

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

Another slide switch 44 is provided in the switch device 40. The slide circuit 44 extends from the slide switch 44 to the solenoid SOLA1 and the contraction circuit 46 to the solenoid SOLB1.

Further, the alarm circuit 48 provided with the buzzer 47 and the second detector 22 is branched before the slide switch 44.

Although the lock device is manually operated in the embodiment, it may be automatically locked by contacting the dump frame side regulating member when the loading platform reaches the most advanced position. It is possible.

The present invention has the above-described structure, and the operation will be described next. When used as a dump truck, first, the operating lever 15 of the lock device 12 is rotated forward of the loading platform 7 as shown by the alternate long and short dash line in FIG. Locked on the dump frame 2. The above work can be performed after the vehicle is used as a vehicle.

After that, the main switch 31 is set to "contact" in the cab 33, and then the select switch 32 is connected to the dump work circuit 34 side.
Then, the dump switch 36 is lifted to “contact” the circuit 37.

Solenoid SOLA because the first detector 19 is "contact"
2 is energized, the second switching valve 29 is switched, the dump cylinder 5 extends, and the platform 7 dumps together with the dump frame 2.

At this time, when the lock device 12 is not in the locked state, the solenoid SOL A2 is not energized because the first detector 19 is “off”, and the loading platform 7 cannot be dumped.

When lowering the loading platform 7, the dump switch 36 is lowered to “contact” the circuit 38 to energize the solenoid SOLB2, and the second
The switching valve 29 is switched, the dump cylinder 5 is contracted, and the platform 7 is lowered. The fourth detector 25 when the loading platform 7 is in the retracted state
Turns off and the solenoid SOLB2 is de-energized. Next, when it is used as a vehicle carrier, first, the select switch 32 is brought into contact with the slide work circuit 35 side in the cab 33, and then it is brought out to the side of the vehicle body 1 and the operating lever of the lock device 12 is operated. The locking device 12 is unlocked as shown in FIG. 4 by rotating 15 at the rear of the loading platform 7 as shown by the solid line in FIG. After that, the dump switch 41 of the switch device 40 for sliding work is brought into "contact" with the auxiliary lifting circuit 42 side.

Since the third detector 23 on the auxiliary raising circuit 42 is in "contact", the solenoid SOLA2 is energized, the second switching valve 29 is switched, the dump cylinder 5 is extended, and the platform 7 is tilted. At that time, since the loading platform 7 is held by the slide cylinder 8, it does not slide. Therefore, the locking device 12 may be released before the predetermined angle is reached, not at the beginning.

According to the operator's visual inspection, the platform 7 has an upper limit angle (about 20
The dump switch 41 is turned off to stop the tilting.

At that time, even if the operator's visual inspection is mistaken and the dump switch 41 is kept in the "contact" position, the third detector 23 will be "disconnected" when the platform 7 reaches the upper limit angle, and the solenoid SOLA2 will not be energized. The tilting of the loading platform 7 is automatically stopped.

After stopping the tilting, slide the slide switch 44 and extend the circuit 45.
Make contact with the side.

The solenoid SOLA1 is energized by the "contact" on the extension circuit 45 side, the first switching valve 28 is switched, the slide cylinder 8 is extended, and the platform 7 moves rearward on the dump frame 2.

Note that the above operation is for the case where the lower limit angle (about 8 degrees) of the predetermined angle or more is exceeded, and when the angle is less than the lower limit angle, the second detector 22 is "off" and the solenoid SOLA1 is not energized. The rearward movement of the loading platform 7 can be restricted.

As a result, it is possible to avoid a state in which the support leg 11 is not grounded when the cargo bed 7 is at the rearmost position.

After the loading platform 7 moves to the rearmost side, the door 10 is opened as shown in FIG. 2 and the vehicle is loaded on the loading platform 7.

It should be noted that, when the load platform 7 exceeds the lower limit angle, the alarm circuit 48 is also energized and the buzzer 47 sounds to inform the surroundings that the loading and unloading work of the vehicle is about to begin, so as to call attention. When the loading and unloading of the vehicle is completed, the door 10 is closed from the state shown in FIG. 2, the slide switch 44 is contracted to "contact" the circuit 46 side, and the solenoid SOLB1 is energized. By energizing the solenoid SOLB1, the first switching valve 28 is switched, the slide cylinder 8 is contracted, and the loading platform 7 is moved forward.

After the loading platform 7 moves to the forefront (two-dot chain line in FIG. 2), the operating lever 15 of the lock device 12 is rotated to the front of the loading platform 7 to move it.
Locks the dump frame 2 and the first detector
Bring 19 into contact.

In this state, when the dump switch 41 is brought into contact with the auxiliary lowering circuit 43, the solenoid SOLB2 is energized to shrink the dump cylinder 5 and lower the platform 7 to the state shown in FIG. At that time, if the angle of the platform 7 becomes less than or equal to the lower limit angle, the second
Although the detector 22 is "off", the first detector 19 is "on" so that the energized state of the solenoid SOLB2 can be maintained.

(G) Effect of the Invention As described above, according to the present invention, the lock device for integrating the loading platform with the dump frame is provided, and the first detector for detecting the locked state is provided, and the locked state is detected by the first detector. Since the full dump operation of the cargo bed is made effective only in such a case, it is possible to reliably avoid the risk of dropping the cargo bed when the dump truck is used as a dump truck, and to secure work safety.

In addition, when the dump switch is raised during the sliding operation, the platform is tilted, but when the angle exceeds a predetermined angle, detection of the third detector restricts further tilting. It can be surely prevented.

[Brief description of drawings]

FIG. 1 is an overall view of a vehicle that also serves as a dump truck, FIGS. 2 and 3 are operation state diagrams, FIG. 4 is a partially enlarged view, and FIG.
6A and 6B are hydraulic circuit diagrams and FIG. 7 is an electric circuit diagram. 1 is a vehicle body, 2 is a dump frame, 7 is a luggage carrier, 12 is a locking device, and 19 is a first detector.

Claims (1)

[Claims] 1. A dump frame 2 tilted by a tilting device 6 is mounted on a vehicle body 1, a loading platform 7 slid by a slide device 9 is provided on the dump frame 2, and the loading platform 7 is integrated with the dumping frame 2. In order to fix the loading platform 7 to the dump frame 2 between the dump frame 2 and the loading platform 7, in a vehicle carrier that can be used as a dump truck and that can tilt the dump frame 2 at a predetermined angle and slide the loading platform 7 back and forth. Lock device 12 is provided, and a select switch 32 is provided that can arbitrarily select a dump work circuit 34 that enables a full dump operation of the cargo bed 7 and a slide work circuit 35 that allows a slide operation of the cargo bed 7 to perform the dump work. A dump switch 37 for tilting operation and a first detector 19 for detecting the locked state of the lock device 12 are provided in the circuit 34, and the slide work operation is performed. In the path 35, a dumping switch 41 for tilting operation and a slide switch 44 for sliding operation are provided in parallel, and a third detector 23 for detecting that the loading platform 7 has exceeded a predetermined angle is provided in series with the dumping switch 41. First lock the lock device 12 when the dump work circuit 34 is selected
When the detector 19 detects, the dump switch 37 lifting operation becomes effective, and when the slide work circuit 35 is selected, the dump switch 37
When the lifting operation of 41 is effective and the loading platform 7 tilts by a predetermined angle or more, a safety device for a vehicle for a vehicle that also serves as a dump truck is provided with a control device that restricts further tilting by detection by the third detector 23.