JPS5846402B2 - Garbage truck safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for a garbage collection vehicle that prevents a garbage input box that serves as a rear gate for the garbage storage box from being opened inadvertently.

Generally, at the rear opening of the garbage storage box of a garbage collection vehicle, a dumping box equipped with an automatic garbage pushing device having a hydraulically driven pushing plate and a rotating or swinging type scraping plate is installed in a freely tiltable manner. The actuation of the plate and the tilting of the input box are configured so that the same hydraulic cylinder is used. During normal garbage loading work, the garbage storage box and the input box are locked and secured by the lashing means operated by the hydraulic cylinder. When the garbage has been loaded and transported to the processing plant and the garbage is discharged from the storage box, the lashing relationship between the storage box and the input box is released, the input box is tilted, and the garbage is moved to the rear of the storage box. Open the opening wide, dump the storage box, and discharge the garbage.

Incidentally, garbage loading work is carried out by a garbage collection vehicle that goes around many garbage collection sites, and each time a worker operates a plurality of operation button switches to carry out the work.

At this time, if the garbage storage box reaches the Kansho state and the expansion force of the stored garbage is applied to the push plate, if you accidentally operate the operation button for opening the input box, the garbage will expand even if the hydraulic pump is not driven. There is a risk that the pressure oil in the hydraulic cylinder for operating the push plate will flow into the lashing hydraulic cylinder and the lashing relationship between the garbage storage box and the loading box will be released and the loading box will be opened. It's dangerous.

The present invention has been invented in view of the above-mentioned points, and is intended to prevent the garbage storage box and the input box from being locked together due to erroneous operation of the electric operating device that controls the operation of the hydraulic system that drives each part installed in the garbage collection vehicle. The purpose is to provide a device with improved safety by preventing the release of binding relationships.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a chassis, 2 is a garbage storage box installed on this chassis 1, which has an opening 3 at the rear and whose rear end base is pivoted 4 to the chassis 1. A hydraulic cylinder 5 installed between the container box 2 and the chassis 1 expands and contracts to appropriately dump the container.

Reference numeral 6 denotes a charging box installed in the opening 3 of the storage box 2, the top of which is pivotally attached 7 to the upper rear end of the storage box 2, and a push plate 9 and a rotary scraper are installed inside the base forming an input port 8 at the rear. It has an insert plate 10 and serves as a rear gate.

The upper end of the pushing plate 9 is pivoted 11 to the inner wall of the input box 6, and is swung back and forth by a hydraulic cylinder 12 connected between a point above the pivoted section 11 and a point on the rear end of the storage box 2.

The pivot point of the hydraulic cylinder 12 with respect to the storage box 2 is located slightly inside the pivot point 7 of the charging box 6, and the push plate 9 is fixed inside the charging box 6 at its forward limit position when the charging box 6 is opened. It can be fixed by a stopper 26.

The scraping plate 10 is pivoted 13 at its base end to the inner wall of the input box 6 below the pressing plate 9, and has a dirt storage chamber 14 bulging at the bottom of the loading box 6 as its rotating range. It enters the swinging trajectory and rotates to the right in the figure, and in the middle of its upward rotation, it is stopped at a substantially horizontal position where the tip faces the opening of the storage box 2, and the lower end of the pushing plate 9 touches the upper surface of the scraping plate 10. oscillates close to.

That is, the scooping plate 10 scoops up the garbage thrown into the garbage storage chamber 14 at the bottom of the input box 6 and stops, and the pushing plate 9 swings to push the garbage into the storage box 2. be.

Reference numeral 15 denotes a lashing claw that secures the input box 6 in the storage position, and a link mechanism 18 is operated as needed by the expansion and contraction of a receiver 16 provided at the front lower part of the input box and a hydraulic cylinder 17 installed on the lower surface of the storage box 2.
A binding withdrawal is made via .

Next, the hydraulic circuit will be explained.

P is a hydraulic pump, T is an oil reservoir, ■1 is a switching valve for controlling the hydraulic cylinder for dumping, ■2 is a switching valve for controlling the hydraulic cylinder 12 for operating the pushing plate, and ■3 is hydraulic pressure for operating the scraping plate 10. These switching valves are for controlling the motor 19■
1■2. (3) is connected in series to the discharge pipe 22 of the hydraulic pump P, and a check valve 23 is interposed in the pipe between the switching valves (1) and (2).

■4 is a switching valve for controlling the lashing hydraulic cylinder 17, and this switching valve ■4 is the switching valve ■7. ■2. (1) It is connected to the discharge pipe 22 of the hydraulic pump P in parallel with 3.

Reference numeral 24 indicates an oil return pipe to the oil reservoir T, and 25 indicates a safety valve interposed at appropriate locations between the discharge pipe 22 and the oil return pipe 24.

Each of the switching valves is controlled by the operation of a pushbutton switch in an appropriate electrical operating circuit (not shown).

That is, when loading garbage, put the garbage into the input box 6 from the input port 8, and when the start switch is operated, the pressure oil from the hydraulic pump P is first transferred to the hydraulic cylinder 12 for operating the push plate via the switching valve 2. The pushing plate 9 starts to move backward from its forward limit position.

While the pushing plate 9 is moving back, the switching valve 3 is switched, and the hydraulic motor 19 starts rotating, the scraping plate 10 rotates, scoops up the garbage thrown into the dumping box, and then stops.

Subsequently, the pushing plate 9 moves forward over the stopped scraping plate 10 and pushes the garbage into the storage box.

This garbage loading operation is an example of a well-known garbage collection vehicle.

Although the scraping plate 10 is of a rotating type here, the same applies to a swinging type using a link or the like.

Repeat the loading of garbage as described above, and then
On the other hand, when the garbage is loaded under the strong pressure screen until it becomes like a Chinese book, the expansion force of this garbage is applied to the pushing plate 9 that supports it at the forward limit position.

If you accidentally operate the push button switch for opening the input box in this state, the switching valves ■2 and ■4 will switch, and the hydraulic cylinder 12 and the discharge pipe 22 will communicate, causing the pressure oil in the hydraulic cylinder 12 to flow backwards. However, in the present invention, this is prevented by the check valve 23 and no pressure oil flows into the lashing hydraulic cylinder 17 unless the hydraulic pump P is operated, and therefore the garbage storage box is not operated. The lashing relationship with the input box is still continuous and safe.

As is clear from the above explanation, when the hydraulic pump of the hydraulic system installed in the garbage collection vehicle is not in operation, the oil in the hydraulic circuit that receives the expansion force of the garbage flows backward due to an erroneous operation of the electric control circuit, and the garbage is collected. I made sure not to release the lashing relationship between the box and the input box that plays the role of the rear gate.
This further improves the safety of garbage collection vehicles, and
It has many features, such as its simple configuration and the ability to implement it on existing garbage collection vehicles with some modifications.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the entire rear part of the garbage collection vehicle, and FIG. 2 is a hydraulic circuit diagram. 1...Chassis, 2...Accommodation box, 3...
...opening, 4...pivot, 5...
Cylinder 6... Insertion box, 7... Pivot joint, 8... Input port, 9... Push plate,
10... Scratching plate, 11... Shaft attachment part, 1
2... Hydraulic cylinder 13... Shaft mounting part, 14... Dust storage chamber, 16... Receiver, 17... Hydraulic cylinder , 18...
・Link mechanism, 19... Hydraulic motor for operation,
22...Discharge pipe line, 23...Check valve,
24...Oil return pipe, 25...Discharge pipe, 26...Stopper P...Hydraulic pump, T...Oil reservoir, vl...Switching valve for controlling the hydraulic cylinder for curved dumping, ■2...Switching valve for controlling the hydraulic cylinder 12 for operating the curved pushing plate, V3...
. . . A switching valve for controlling the hydraulic motor 19 for operating the scraping plate 10.

Claims (1)

[Claims] 1. A freely tiltable input box equipped with an automatic garbage pushing device having a push plate and a rotating or swinging type scraping plate is provided at the rear opening of the garbage storage box, and the operation of the push plate and the tilting of the input box are controlled. In a garbage collection vehicle that is shared by the same hydraulic cylinder, the hydraulic circuit for controlling the operation of the pushing plate and the hydraulic circuit for lashing the loading box are connected in parallel, and a check valve is installed in the hydraulic circuit for controlling the operation of the pushing plate. A safety device for a garbage collection vehicle, characterized in that the safety device is configured to prevent pressure oil from flowing from the circuit to the lashing control circuit of the dumping box.