JPS6248633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overturn prevention device for a dump truck.

In general, in a dump truck, there are places where the loaded material is discharged, some of which are horizontal, and some of which are somewhat inclined.

Therefore, when unloading work is performed at a location that is tilted to the side of the vehicle body, as the cargo box tilts, the center of gravity of the cargo box shifts to the side, resulting in the cargo box overturning.

However, in the past, there was no means to detect the inclination angle of the discharge location, and the operator relied on his or her intuition, which was extremely dangerous.

The present invention solves the above-mentioned problems,
An alarm device is activated when the cargo box is tilted on a slope of a predetermined angle or more.

The following embodiment will be explained with reference to the drawings. Reference numeral 1 denotes a dump truck, and the dump truck 1 consists of a vehicle body 2, a driver's seat 3, and a cargo box 4. It is supported so as to be tiltable rearward, and is also tilted by a hydraulic cylinder 6 provided between the cargo box 4 and the vehicle body 2.

Reference numeral 7 denotes a disconnection/disconnection switch fixed to the vehicle body 2 via a bracket 8. As shown in FIG. provided,
When the support arm 12 provided above the casing 9 is pressed by the lowering of the packing box 4, the positive terminal 10 is bent via the spool 13, and both terminals 10 and 11 become "broken". There is.

Further, when the cargo box 4 rises, both terminals 10 and 11 are brought into "contact" by the spring force of the positive terminal 10.

Reference numeral 14 denotes a detector that detects the inclination angle θ (usually about 7°) at which there is a risk of overturning when the cargo box 4 is tilted to the maximum.The detector 14 is connected to the hinge portion 5, It is fixed on a crossbeam 15 that supports 5.

As shown in FIG. 4, the detector 14 has a positive terminal 17 at both left and right ends of a sealed insulating container 16.
and a negative terminal 18 are provided, and mercury 19, which is a conductive liquid, is sealed in the container 16. When the container 16 is in a horizontal state, the positive terminal 17 and the negative terminal 18 are connected through the mercury as shown in FIG. 4a. When the container 16 is energized and tilted at an angle θ in either the left or right direction, the energization to both terminals 17 and 18 is cut off as shown in FIGS. 4b and 4c.

Next, to explain the electrical system with reference to FIG. 5, there is a disconnect switch 7, a detector 14, and a relay
are provided in series, and a relay switch r and a buzzer B serving as an alarm device are provided in series on an auxiliary circuit 21 provided in parallel to the detector 14 and the relay R, and when the relay R is energized, the relay switch r is activated.
It has become a state of ``disconnection.''

6 and 7 show other embodiments of the detector and the electrical system, in which the detector 22 is connected to a closed insulating container 23.
Positive terminal 24 at the bottom and negative terminal 2 on the left and right.
5 and 25 respectively, and furthermore, mercury 26, which is a conductive liquid, is sealed in the container 23. When the container 23 is in a horizontal state, the mercury 26 contacts only the positive terminal 24 as shown in FIG. 6a, and the positive terminal 24 energization to the negative terminals 25, 25 is cut off, and the container 23
When the positive terminal 24 is tilted at an angle θ in either the left or right direction, the positive terminal 24 is energized to the negative terminals 25, 25 via the mercury 26, as shown in FIGS. 6b and 6c.

The electrical system includes a disconnect switch 7, a detector 22, and a buzzer B connected in series on a main circuit 27. In the example, the detector has a structure in which mercury is sealed in a container, but the structure is not necessarily limited to this, and any similar structure can be used as long as it can electrically detect the inclination of the vehicle body in the left-right direction. It satisfies the action and effect.

The present invention has the above-mentioned structure. Next, the operation will be explained. First, when the hydraulic cylinder 6 is extended in a horizontal place and the cargo box 4 is tilted, the disconnection switch 7, which had been pressed by the cargo box 4, is turned off. The positive terminal 10 returns to the one-dot chain line in FIG. 3 due to the spring force and becomes in "contact" with the negative terminal 11.

Further, since the detector 14 is in a horizontal state (FIG. 4a), both terminals 17 and 18 are in a "contact" state, so that the relay R is energized. When relay R is energized, relay switch r is turned off, blocking energization to buzzer B, and buzzer B does not sound.

Next, as shown in FIG. 2, when the hydraulic cylinder 6 is extended and the cargo box 4 is tilted at a location inclined at an angle θ, the disconnection switch 7 becomes "on" in the same manner as described above.

However, since the detector 14 is in the tilted state (FIG. 4b), both terminals 17 and 18 are "off", so energization to the relay R is blocked.
Along with this, relay switch r becomes "closed".

When the relay switch is turned on, the buzzer B is energized and the buzzer B sounds to notify the worker of the danger of rollover.

This allows the operator to move the dump truck 1 to a horizontal location and discharge the dump truck, thereby reliably preventing overturning.

As described above, the present invention uses a disconnect switch that is controlled by the tilting of the cargo box, a detector that detects the angle of inclination of the vehicle body, and an alarm device. When the vehicle is tilted, an alarm device is activated to notify the operator of the risk of rollover in advance, so rollovers can be reliably prevented without relying on intuition as in the past.

Furthermore, since the alarm device is activated by tilting the cargo box, the alarm device will not be activated while the vehicle is running.

[Brief explanation of the drawing]

Figure 1 is an overall view of the dump truck, Figure 2 is a rear view, Figure 3 is a partially enlarged view, Figure 4 is an overall view of the detector, Figure 5 is an electrical system diagram, and Figures 6 to 7. is another example. 7 is a disconnection switch, 14 is a detector, and B is a buzzer.

Claims (1)

[Claims] 1. A disconnection switch controlled by the tilting of the cargo box;
It consists of a detector that is installed near the hinge, which is the center of tilting of the cargo box, and detects a tilt of a predetermined angle to the side, and an alarm device consisting of a buzzer, etc., and detects when the vehicle body is tilted to the side by a predetermined angle or more. An overturn prevention device for dump trucks that activates a warning device when the cargo box tilts.