JP2708719B2 - Garbage truck forcible retraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forcibly retreating a discharge plate in a dust storage box when the load on a pressing cylinder becomes abnormally large in a dust pressing process. About.

[0002]

2. Description of the Related Art As shown in FIG. 3 (A), a refuse collection vehicle has a refuse storage box 2 and a refuse input box 6 which is attached to a rear opening 4 so as to be openable and closable. As shown in FIG. 3 (B), a rotatable scraping plate 8 and a push plate 10 which is swingable in the front-rear direction are disposed inside the charging box 6 as shown in FIG. The dust input from the input port 12 is
, And is pushed horizontally forward by the pushing plate 10 into the storage box 2. In the press type refuse collection vehicle, a packer plate 14 that moves up and down in a tilting direction as shown in FIG.
Press plate 16 swingably attached to the lower end of the plate
Are arranged. The packer plate 14 and the press plate 16 are configured as a pair, and are pushed into the dust storage box 2 while alternately picking up the dust input from the input port 12 by the press plate 16.

[0003] A discharge plate 18 which can move back and forth and a multi-stage discharge cylinder 20 for driving the discharge plate 18 are arranged in the storage box 2. When dust is loaded, the discharge plate 18 is pressed by the pressure of the dust.
Gradually moves backward (vehicle forward direction), and at the time of garbage discharge, the input box 6 is turned upward to open the rear opening portion 4, and the discharge plate 20 is rapidly advanced by the discharge cylinder 20 (vehicle backward direction).
When driven, the dust is discharged from the storage box 2.

[0004]

As described above, in the conventional refuse collection vehicle, the discharge plate 18 is retracted by the refuse pushing pressure when the refuse is loaded, but the refuse is twisted with the inner surface of the storage box 2. Occasionally, a situation occurs in which the pushing pressure does not sufficiently act on the discharge plate 18. In particular, in a press-type refuse collection vehicle, bulky refuse such as a washing machine or a refrigerator is compressed and crushed and pushed in. However, relatively large crushed pieces form a bridge in the storage box 2 and tend to be twisted. If the refuse is continuously pushed in while this state is left, the pry becomes harder and the discharge plate 18 may not be retreated at all. In such a case, only a small part of the volume of the storage box 2 can be effectively used, so that the amount of garbage stored is significantly reduced.

An object of the present invention is to secure a sufficient dust accommodating space by forcibly retracting the discharge plate 18 when dust is twisted in the accommodating box 2.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a discharge cylinder for driving a discharge plate when a load applied to a pressing plate or a press plate as a pressing member becomes abnormally large or more than a predetermined pressure. (Second cylinder) is temporarily forcibly driven in the shortening direction by the control means. A pressure switch attached to the hydraulic system of the first cylinder that drives the pushing member is used for detecting the load. Also, every time the load exceeds a predetermined pressure, the discharge plate is forcibly retracted. The time of the forced drive is 1 second or less, and preferably a very short time of about 0.2 second is sufficient. Timer means is used for controlling the driving time. In addition, depending on the type of garbage, the pressure switch can be set continuously for a predetermined time to increase the compression efficiency.
Better to temporarily force driving the abnormally large at loads above a predetermined pressure from detection a plurality of times a second cylinder. In this case, a counter capable of increasing or decreasing the number of times is added to count the number of times the pressure switch is detected.

[0007]

When the dust is twisted in the storage box, an abnormally large load exceeding a predetermined pressure acts on the first cylinder when the pushing operation is performed by the pushing plate or the press plate. This load appears as an increase in hydraulic pressure on the drive side of the first cylinder,
The pressure switch attached to the hydraulic system
It becomes N. By the ON operation of the pressure switch, the switching valve for supplying the hydraulic pressure to the second cylinder for discharge is switched, and the discharge valve is discharged.
The plate is forcibly driven in the backward direction for a predetermined time. afterwards,
The switching valve returns to the original neutral state, and the discharge plate returns to the normal operation in which it is naturally retracted by the pushing pressure. If a counter is provided and the number of times is set to a plurality of times, the second switch is temporarily forcibly driven after the pressure switch detects an abnormally large load of a predetermined pressure or more continuously for a predetermined time and a plurality of times. You. Accordingly, the relatively soft dust is effectively compressed until the second cylinder is temporarily forcibly driven, so that there is no possibility that the dust loading amount is reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a control flowchart of the forced retreating device of the discharge plate 18, and FIG. 2 is a hydraulic circuit of the press-type refuse collection vehicle. In FIG. 2, 22 is a packer cylinder for driving the packer plate 14, 24 is a press cylinder (first cylinder) for driving the press plate 16, 26 is a discharge cylinder (second cylinder) for driving the discharge plate 18, and 28 is an input box. Ascending cylinder for six rotations, 30 is a tightening cylinder, 32 is an oil tank,
34 is a gear pump, 36 to 40 are solenoid valves, 42 is a pressure switch attached to the extension side hydraulic system of the press cylinder 24, and 44 to 46 are relief valves.

In a normal pushing operation, the electromagnetic valve 38 is switched to the F side, the packer cylinder 22 is extended, the packer plate 14 is raised obliquely forward, and the electromagnetic valve 37 is set to N.
In this position, it rises diagonally forward integrally with the packer plate 14. At this time, the solenoid valve 36 remains at the N position, and when the piston rod 26a of the discharge cylinder 26 is pressed in the shortening direction by the pushing pressure of the dust through the discharge plate 18, the oil in one chamber 26b is discharged. The oil is returned to the oil tank 32 via the relief valve 44. This operation is repeated every time the dust is pushed in, and the inside of the storage box 2 is gradually filled with dust.

When dust is generated in the storage box 2, that is, when a load of a predetermined pressure or more is applied to the press plate 16 or the press cylinder 24, the press cylinder 2
A load acts in the direction in which the piston rod 24a of No. 4 is pushed in, and the oil pressure in the extension operation side chamber 24b rises, and the pressure switch 42 is turned on. Assuming that the delivery main oil pressure of the gear pump 34 is, for example, 175 kg / cm ² , the set pressure of the pressure switch 42 is slightly lower than this, for example, 5 kg / cm ^2.
keep cm ² and only low 170kg / cm ^2. When the pressure switch 42 is turned on, the solenoid valve 36 is switched to the R side, that is, the shortening operation side of the discharge cylinder 26, and the discharge plate 1
8 is forcibly driven in the backward direction. The driving time of the discharge cylinder 26 at this time may be very short, and an instantaneous operation such as 0.2 seconds is sufficient. The pressure switch 42
It is also conceivable that the ON / OFF operation is repeated little by little. If the discharge cylinder 26 is driven every time the ON operation is intermittent, the operation is not stable.
It is desirable that the discharge cylinder 26 be driven only when the switch 2 is continuously turned ON for, for example, about 5 seconds or more. Also, depending on the type of garbage, that is, when the contents of the garbage are mainly relatively soft ones such as waste paper and garbage, the pressure switch 42 is turned ON only once continuously for about 5 seconds or more. It may be more effective to drive the discharge cylinder 26 for the first time after the continuous ON operation for about 5 seconds or more has occurred a plurality of times than to drive the discharge cylinder 26 in order to increase the dust compression efficiency. Assuming such a case, the ON operation of the pressure switch 42 for about 5 seconds or more is counted by a counter device, and the discharge cylinder 26 is driven after the number of counts reaches a predetermined number corresponding to the type of dust. You may. For example, set the counter to 1 for relatively hard bulky garbage such as washing machines and refrigerators, set it to twice for bulky garbage of small items such as bottles and cans, and set it to 2 times for waste paper and garbage. Set to 3 times.

The above operation will be described with reference to the flowchart of FIG. 1. Starting from step S1, it is determined in step S2 whether or not the pressing process is performed. This determination is made based on the operation status of the packer cylinder 22 and the press cylinder 24. That is, in the pressing process, the press cylinder 2
4 stops, the packer cylinder 22 extends, and the press plate 16 and the packer plate 14 move diagonally upward in an integrated manner. From this operating condition, it can be understood that the pressing process is performed. The reason why the pressing process is determined in this way is that the press plate 16 performs a scraping operation before the pressing operation, that is, an operation of moving the dust input from the input port 12 to the storage box 2 while rotating the press plate 16. This is to prevent the discharge cylinder 25 from unnecessarily retreating due to the load acting on the press plate 16 at this stage.

In step S3, it is determined whether or not the pressure switch 42 is ON. When the pressure switch 42 is turned on and 5 seconds have elapsed, the timer starts operating in step S4, and then the discharge cylinder 26 starts operating in the shortening direction in step S5, and whether 0.2 seconds has elapsed in step S6. It is determined whether or not it is. The discharge cylinder 26 continues to be driven until 0.2 seconds have elapsed, and then is stopped.

Although the present invention has been described with reference to an embodiment in which the present invention is applied to a press-type refuse collection vehicle, the present invention is also applicable to a pack-type refuse collection vehicle. The pressure switch 42 is attached to the hydraulic system of the cylinder that drives the. Other configurations are the same as those of the press type.

[0014]

As described above, according to the present invention, when a large load is applied to the pushing member, the discharge plate is forcibly and temporarily retracted, so that the dust is twisted in the storage box. The retraction of the discharge plate can be eliminated, and the loss of the refuse storage amount can be eliminated by making full use of the storage box volume.

[Brief description of the drawings]

FIG. 1 is a control flow chart of a discharge plate forced retreating device.

FIG. 2 is a hydraulic circuit diagram.

FIG. 3 (A) is a side view of a pack type refuse collection vehicle, (B)
2 is a schematic cross-sectional view of the input box of the refuse collection vehicle, and FIG. 3C is a similar cross-sectional view of the press-type refuse collection vehicle.

[Explanation of symbols]

 2 ... dust storage box 4 ... rear opening 6 ... dust insertion box 14 ... packer plate 16 ... press plate 18 ... discharge plate 20, 26 ... discharge cylinder (second cylinder) 22 ... packer cylinder 24 Press cylinder (first cylinder) 36, 37 Solenoid valve 42 Pressure switch

Claims (4)

(57) [Claims] 1. A pushing member for pushing dust into a dust container, a first cylinder for driving the pushing member, a discharge plate arranged to be movable back and forth inside the dust container, and the discharge plate A second cylinder for driving the cylinder back and forth, a pressure switch for detecting that an abnormally large load greater than a predetermined pressure is applied to the first cylinder, and moving the discharge plate in a retreating direction based on a detection result of the pressure switch. temporarily strength of the second cylinder in order to
A forcible retreating device for a refuse collection vehicle, comprising: a control means for controlling braking and driving. 2. The device for forcibly retracting a refuse collection vehicle discharge plate according to claim 1, wherein the pressing member is a press plate of a press type refuse collection vehicle or a press plate of a pack type refuse collection vehicle. 3. The device according to claim 1, wherein said control means includes timer means for moving said discharge plate in a retreating direction for a predetermined time. 4. The apparatus according to claim 1, wherein said pressure switch is different for a predetermined time continuously.
Always provided a counter for counting the number of times of detecting the large place greater load than the constant pressure, the counter according to claim 1, wherein which is adapted to temporarily force driving the second cylinder when counting a predetermined number dust Collection device forced retraction device for collection vehicles.