JPH0532281B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a safety device for a garbage collection vehicle.

(Prior art) Conventionally, in a garbage collection vehicle, when carrying out maintenance and inspection of the garbage processing device housed in the garbage storage box, a telescopic cylinder is operated to tilt the input box backward, and then the garbage disposal box is tilted backwards. Safety rods housed on both sides of the end protrude rearward to hold the garbage disposal box in a tilted state.

(Problem to be Solved by the Invention) Generally, the telescopic cylinder that tilts the garbage disposal box is a double-acting type, and if the garbage disposal box is held in a tilted state by a safety rod, the garbage disposal box may be lowered due to an erroneous operation. If you try to do this, in addition to the weight of the garbage disposal box, the compressive force from the telescopic cylinder will be applied in the direction that compresses the safety rod, so the strength of the safety rod will need to be increased that much, which will result in a disadvantageous structure from a safety point of view. I was getting used to it.

(Means for Solving the Problems) The present invention has been made in view of the above problems, and includes a garbage input box rotatably pivoted to the rear upper part of the garbage storage box, and a garbage storage box and a garbage storage box. In the garbage collection vehicle, a telescopic cylinder is provided between the retractable cylinder and a safety rod is provided at the rear end of the garbage storage box so as to be retractable between the storage position and the working position. An electromagnetic opening/closing valve is disposed in a circuit communicating with the oil chamber on one side of the telescopic cylinder and is normally energized at a position that prevents contraction of the telescopic cylinder and allows expansion; An operation switch is provided to control the tilting of the garbage disposal box, and when the garbage disposal box is lowered via the tilting switch, the garbage disposal box is lowered by its own weight via a switch-controlled electromagnetic on-off valve and an electromagnetic control valve in a neutral position. When the garbage disposal box is lowered, it is lowered by its own weight so that no extra load is placed on the safety rod.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a garbage collection vehicle, and a garbage storage box 3 is placed on a vehicle frame 2. A garbage disposal box 4 is pivotally mounted above the bin 4 and is connected to the bin 4 so as to be tiltable rearward.

The base end of a telescoping cylinder 6 is pivotally attached to both edges of the rear end of the garbage storage box 3 by a pin 7, and the tip of the telescoping cylinder 6 is attached to a lever pivotally supported by a pin 8 to the side of the garbage input box 4. It is pivotally connected to one end of 9 with a pin 10.

The other end of the lever 9 is pivotally connected to the upper end of a connecting rod 11 by a pin 12, and the connecting rod 11 is extended downward and its lower end is connected to the lashing claw 1 by a pin 13.
4, and the lashing claw 14 is pivotally connected to a bracket fixed to the lower part of the garbage input box 4 by means of a pin 15. On the other hand, a hook 16 that engages with the lashing claw 14 is fixed to the bottom of the garbage storage box 3 at the tip of the lashing claw 14. 16 and the like constitute a securing mechanism 17.

Furthermore, a lever 9 to which the telescopic cylinder 6 is connected
A stopper 18 protruding from the side of the garbage disposal box 4 is fixed on the lower surface at a slight distance, and is configured such that when the telescopic cylinder 6 is extended, the lower surface of the lever 9 first comes into contact with the stopper 18. .

Further, the lower ends of safety rods 19, 19 are pivotally attached to both edges of the rear end of the garbage storage box 3 by pins 20, 20, respectively, and the storage position is along the rear edge of the garbage storage box 3 as shown by the solid line in FIG. and a working position where the garbage input box 4 is held in a tilted position as shown by the imaginary line in FIG.

Next, the hydraulic circuit will be explained with reference to FIG.
P is a hydraulic pump, T is an oil reservoir, V1 is a center bypass type electromagnetic control valve that controls the telescopic cylinder 6, V2 and V3 are arranged in a circuit that communicates with the oil chamber on the piston back pressure side of the telescopic cylinder 6, and This is an electromagnetic on-off valve that is normally energized to a position that blocks the flow of pressure oil to the hydraulic cylinder and allows the flow of pressure oil to the hydraulic cylinder.V1, V2, and V3 are equipped with solenoids SOLa, SOLb, and SOLk for operating the valve spools, respectively. ，
Has SOLl. Next, the electric circuit will be explained.
Figure 3 is an electrical circuit diagram showing a part of the garbage collection vehicle, where B is the power supply such as a battery, BZ is the buzzer, and SW9.
is an operation switch for tilting the garbage input box 4, and LS6 is an electric contact that operates when the garbage input box 4 is connected to the garbage storage box 3.

Next, the effect will be explained. The garbage input box 4 shown by the solid line in FIG. 1 shows the running state. To tilt the garbage input box 4 backward around the pivot 5,
Turn the operation switch SW9 upward. As a result, current flows to the buzzer BZ to issue an alarm, and at the same time flows to the solenoid SOLa, which causes the solenoid control valve V1 to
is switched to the upper position, and the telescopic cylinder 6 is operated to extend. When the telescopic cylinder 6 extends, the lower surface of the lever 9 first moves until it comes into contact with the stopper 18, and as a result, the lever 9 rotates clockwise around the pin 8, as shown in FIG. 1, and the connecting rod 11 is pulled up. At the same time, the lashing claw 14 rotates counterclockwise and is removed from the hook 16. When the telescopic cylinder 6 is further extended, the garbage input box 4 starts to tilt counterclockwise around the pivot 5 via the stopper 18, and the connection between the garbage input box 4 and the garbage storage box 3 is released. and the electrical contact LS6 is in the open position.

Finally, the rear end of the garbage storage box 3 of the garbage input box 4 can be opened as shown by the chain line in FIG.

After this, when the garbage disposal box 4 is held in a tilted position for maintenance and inspection of the garbage disposal device (not shown) installed in the garbage disposal box 4, the safety rod 19 in the retracted position is moved to the working position. After extending it, you can work as appropriate. When the work is completed, the safety rod 19 is stored in the retracted position, and then the operating switch SW9 is placed in the lower position. In this state, the electrical contacts
Since LS6 is in the open position, the solenoid SOLb is not energized, and the electromagnetic control valve V1 is held at the neutral position. However, the current is solenoid SOLk,
Since the oil flows into SOLl and switches the electromagnetic on-off valves V2 and V3 to the lower position, the flow of pressure oil from the telescopic cylinder is allowed, and the garbage input box 4 descends under its own weight. At this time, even if the garbage disposal box 4 is lowered by this operation while the safety rod 19 remains in the working state, only the weight of the garbage disposal box 4 acts on the safety rod 19.

On the other hand, when the garbage input box 4 returns to the connected state in contact with the garbage storage box 3, the electric contact LS6 is switched to the lower position, current flows to the solenoid SOLb, and the electromagnetic control valve V1 is switched to the lower position. Therefore, the telescopic cylinder 6 is forcibly contracted, and the lever 9 to which the tip of the telescopic cylinder 6 is connected is moved to the stopper 18.
Rotate in the direction away from.

Therefore, the lashing mechanism 17 is activated, and the lashing claw 14 is engaged with the hook 16. After that, when the operation switch SW9 is returned to the neutral position, the solenoid SOLk
Since the power to SOLl is cut off, the solenoid on-off valve V
2 and V3 are respectively switched to the upper position, the hydraulic pressure of the telescopic cylinder 6 is sealed, the telescopic cylinder 6 is fixed in the contracted position, and the engagement between the lashing claw 14 and the hook 16 is maintained.

In this embodiment, the lashing claw 14 is shown linked to the telescopic cylinder 6 via the lashing mechanism 17, but as shown in FIG. It can also be activated via That is, the lashing mechanism 17 shown in FIG.
The telescopic cylinder 6 may be disposed directly between the garbage input box 4 and the garbage storage box 3, and the lashing cylinder 25 may be connected to the lashing claw 24.

Here, in FIG. 5, V4 is the lashing cylinder 2
This is an electromagnetic control valve that controls the electromagnetic control valve V1, and has solenoids SOLj and SOLm for operating the spool, and is arranged in parallel to the electromagnetic control valve V1.

In this embodiment, when the operation switch SW9 is operated to the lower position, the garbage input box 4 descends under its own weight until the garbage input box 4 is connected to the garbage storage box 3. Thereafter, when the electric contact LS6 is switched, the solenoid SOLj is energized, so that the lashing cylinder 25 is contracted and the lashing claw 24 is engaged with the hook 26.

In addition, when the garbage disposal box is tilted, the solenoids SOLa and SOLm are energized at the same time, and the solenoid control valve V
1 and V4 are switched, but the lashing cylinder 25, which has a lighter load, operates first. Specifically, after the lashing claw 24 is removed from the hanging tool 26, the garbage input box 4 is tilted.

(Effects of the Invention) As explained above, in the present invention, when the garbage disposal box is lowered, it is lowered by its own weight, and no extra compressive force other than the own weight of the disposal box is applied to the safety rod. Even if the garbage disposal box is lowered with the rod extended at the working position, the safety rod and the garbage disposal box will not be damaged. In addition, the safety rod is stronger than the conventional one because it acts only by its own weight.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially omitted side view of a garbage collection vehicle, Fig. 2 is a hydraulic circuit diagram, Fig. 3 is an electric circuit diagram, and Fig. 6 shows another embodiment, of which FIG. 4 is a partial side view of the garbage collection vehicle, FIG. 5 is its hydraulic circuit diagram, and FIG. 6 is its electric circuit diagram. 1... Garbage collection vehicle, 2... Vehicle frame, 3... Garbage storage box, 4... Garbage input box, 6... Telescopic cylinder,
17...Lashing mechanism, 19...Safety rod, V1...Solenoid control valve, V2, V3...Solenoid opening/closing valve.

Claims (1)

[Scope of Claims] 1. A garbage input box is rotatably attached to the rear upper part of the garbage storage box, a telescopic cylinder is provided between the input box and the garbage storage box, and the garbage storage box is stored at the rear end of the garbage storage box. In a garbage collection vehicle equipped with a safety rod that can freely appear and retract at positions and working positions, a center bypass type electromagnetic control valve is disposed between the telescoping cylinder and the hydraulic pump, and communicating with an oil chamber on one side of the telescoping cylinder. A normally energized electromagnetic on-off valve is disposed in a circuit that prevents contraction of the telescopic cylinder and allows expansion, and an operating switch is provided to control the tilting of the garbage disposal box, and the tilting switch is A safety device for a garbage collection vehicle, characterized in that when the garbage disposal box is lowered through the vehicle, the garbage collection vehicle is lowered by its own weight via a switching-controlled electromagnetic opening/closing valve and an electromagnetic control valve in a neutral position. 2. An electric contact is provided between the garbage input box and the garbage storage box to detect the connection state of the garbage input box, and a lashing device for the garbage input box with respect to the garbage storage box is actuated via the electric contact. A safety device for a garbage collection vehicle according to claim 1. 3. The safety device for a garbage collection vehicle according to claim 2, wherein the lashing device has a lashing claw linked to a telescoping cylinder via a lever and a linking rod. 4. The safety device for a garbage collection vehicle according to claim 2, wherein the lashing device has a lashing claw connected to a lashing cylinder.