JPS6138833Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a safety device for dump trucks, especially when the vessel is placed in a down position with the unloading hopper attached to the discharge port, or when the vessel is placed in a down position due to oil leakage from the cylinder. This invention relates to a vessel lowering warning device for a dump truck that issues an alarm when the vehicle naturally descends to prevent damage to the hopper and scattering of cargo.

Conventionally, in a dump truck that transports powder and granular materials, etc. with a raised and raised vessel, when the vessel is placed in an upright position and the powder and granular materials are discharged from the discharge port, the powder and granular materials are placed in the vicinity of the discharge port. Attach the hopper of the cargo receiving device to prevent it from scattering. However, when ejecting is complete and the vessel is placed in the face down position, the hopper may be accidentally operated to the face down position without removing the hopper, which may cause the hopper to tear in the middle or cause the hopper mounting bracket to may be damaged. Furthermore, when the hopper is attached and discharge work is performed, there is a problem that the hopper may be damaged due to natural lowering of the vessel due to oil leakage from the cylinder or the like.

This idea was devised in view of the above-mentioned circumstances, and its purpose is to raise the vessel in the upright position and attach the hopper to the discharge port. To provide a vessel lowering warning device for a dump truck, which prevents damage to a hopper by notifying an operator with an alarm even if the vessel naturally descends due to oil leakage from a cylinder, etc. be.

Hereinafter, this invention will be explained in detail based on an embodiment shown in the drawings.

FIG. 1 is a side view of a dump truck equipped with a safety device according to this invention. In the figure, reference numeral 1 indicates a wheel, and the wheel 1 allows the chassis 2 to move. Palm 2
A subframe 3 is fixed on the top, and a vessel 4 is pivotally attached to the subframe 3 at its rear portion by a shaft 5. Further, the vessel 4 can be raised and lowered by a cylinder 6 using a shaft 5 as a fulcrum.

Fig. 2 is an enlarged side view of the rear of the dump truck shown in Fig. 1 in the upright position. In the figure, 7 is a discharge port, and the mounting portion 9 of the hopper 8 of the cargo receiving device is removably attached to the discharge port 7. It will be installed. And at the discharge port 7 there is a hopper 8.
A first detector 10 is provided to detect the attachment/detachment state of the.

FIG. 3 shows an operating lever 11 for raising and lowering the vessel 4 provided on the subframe 3 shown in FIG.
FIG. The operating lever 11 can be moved "down" or "up" using the support shaft 12 as a fulcrum, as shown by the two-dot chain line.
It can be rotated to each state. By operating the operating lever 11 to the "down" and "up" positions, the vessel 4 is operated to the "down" and "up" states, respectively. An operating rod 13 is pin-coupled to the lower end of the operating lever 11 by a shaft 15 via a pressing piece 14. Further, a second detector 16 is provided at the bottom of the operating lever 11 for detecting the "down" and "up" states of the operating lever 11 using a sensor 16a pressed by the pressing piece 14. .

Further, a pressing piece 18 is fixed to the bearing portion 17 of the shaft 5 shown in FIG. 2, and this pressing piece 18 is rotated in synchronization with the up-and-down state of the vessel 4. The sub-frame 3 is provided with a third detector 19 that detects the undulating state of the vessel 4 by the pressure of the pressing piece 18.

FIG. 4 shows a circuit diagram of the safety device according to this invention. The first detector 10, the second detector 16, and the third detector 19 can all use limit switches. The second detector 16 and the third detector 19 are connected in parallel to form a parallel circuit, and this parallel circuit, the alarm 20, the first detector 10, and the power source 21 are connected in series to form a safety circuit A. configured. Further, the first detector 10 is a switching limit switch, and when the first detector 10 outputs an ON signal, a red lamp 22 is lit.
Green lamp 23 when outputting OFF signal
The red lamp 22 and the green lamp 23 are respectively connected so that the red lamp 22 and the green lamp 23 are lit.

The first detector 10 provided at the rear discharge port 7 of the vessel 4 detects when the hopper 8 is in the attached state.
Since an ON signal is output, the red lamp 22 is lit as shown in FIG. 4, and if the hopper 8 is removed, an OFF signal is output and the green lamp 23 is lit. The second detector 16 outputs an OFF signal when the operating lever shown in FIG. 3 is in the "up" state, and outputs an ON signal when it is in the "down" state. The third detector 19 outputs an OFF signal when the Bethel 4 is in the up state, and when the Bethel 4 falls below a certain level.
Outputs ON signal.

Since this invention has the above-mentioned configuration, first, tilt the operating lever 11 toward the "up" position to turn the Bethel 4.
to the awake state. At this time, both the second detector 16 and the third detector 19 shown in FIG. 4 output OFF signals. Next, when attaching the hopper 8 to the discharge port 7,
The first detector 10 outputs an ON signal, the lighting of the green lamp 23 is replaced by the lighting of the red lamp 22, and the discharge of powder, granules, etc. in the vessel 4 is started. At this time, if the operating lever 11 is accidentally tilted toward the "down" position, the second detector shown in Fig. 4 will output an ON signal, the safety circuit A will be closed, and an alarm will be issued. The device 20 issues an alarm and notifies the operator, so the operator should immediately turn the operating lever 11 to "raise".
This allows the hopper 8 to be returned to its original position, thereby preventing damage to the hopper 8.

Furthermore, when the hopper 8 is attached and the vessel 4 falls below a certain level due to oil leakage from the cylinder 6, the third detector shown in Fig. 4 outputs an ON signal, so the safety circuit A is closed. As in the case described above, the alarm 20 issues an alarm to notify the operator, so the operator can immediately take measures such as removing the hopper 8, thereby preventing damage to the hopper 8.

As described above, according to the safety device according to this invention, if the user accidentally removes the operating lever 1 while wearing the hopper 8,
Even if the hopper 1 is operated toward the "down" position, the operator is notified of the erroneous operation by an alarm, so that the operator can immediately return the hopper to its original position, thereby preventing damage to the hopper 8. Furthermore, even if the vessel 4 falls below a certain level due to an oil leak from the cylinder 6 with the hopper 8 attached, an alarm will be issued to notify the operator of this, allowing the operator to take immediate action such as removing the hopper 8. Damage to the hopper 8 can be prevented. In addition, the red lamp 22 and the green lamp 23
If it is provided in the cab, the installation and removal status of the hopper 8 can be checked inside the cab, and the next operation can be performed safely from inside the cab, so its utility value is significant.

[Brief explanation of the drawing]

Figure 1 is a side view of a dump truck equipped with the safety device of this invention, Figure 2 is an enlarged rear side view of the dump truck shown in Figure 1, and Figure 3 is the operating lever of the dump truck shown in Figure 1. 11 and FIG. 4 are circuit diagrams based on this invention. In the figure, 4... Beth cell, 7... Discharge port, 8... Hopper, 10... First detector, 11...
...Operation lever, 16...Second detector, 19...Third detector, 20...Alarm, 21...Power supply, 2
2, 23...lamp, A...safety circuit.

Claims (1)

[Scope of utility model registration request] A dump truck comprising a vessel having a discharge port for discharging powder and granules etc. and configured to be able to rise and fall, comprising: a first detector for detecting that an unloading hopper is attached to the discharge port; A second detector that detects the state of an operating lever that performs an up-and-down operation, and a third detector that detects an up-and-down state of the Betsu cell, and the second detector and the third detector are arranged in parallel. A safety circuit is formed by connecting this parallel circuit, an alarm, the first detector, and a power source in series, and the light is turned on by the signal from the first detector. Betsuel lowering warning device for dump trucks equipped with a lamp.