JPS628902A - Safety device for opening and closing tail gate for garbage wagon - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a tailgate which is pivoted to the rear end opening of a garbage storage box so that its upper end can be opened and closed, and which is driven in a normal direction so as to scrape up input garbage forward. A garbage loading device is installed, which includes a rotating plate that loads the scraped garbage on the rotating plate into the garbage storage box, and a pushing plate operating cylinder is used to open and close the tailgate relative to the garbage storage box. This invention relates to a safety device for opening and closing the tailgate of a garbage truck.

[Conventional technology]

Conventionally, a stopper that engages when the pushing plate is at the backward limit position and an electric contact that detects when the pushing plate has reached the backward limit position are attached to the tailgate, and when the tailgate is opened, the pushing plate is at the backward limit position. An invention in which the electric contact is inserted into the tailgate opening circuit so that the push plate actuating cylinder does not open the tailgate unless it is in the
37903) or a similar stopper or electric contact, and when the tailgate is opened, the push plate is first engaged with the stopper by the push plate actuating cylinder, and the garbage storage box is opened by the operation of the electric contact. An invention (Japanese Unexamined Patent Publication No. 56-37904) has been disclosed in which a lashing device between the tailgate and the tailgate is released to open the tailgate.

[Problem that the invention seeks to solve]

In these conventional inventions, even when the garbage storage box is full, the tailgate can be opened safely as long as the pushing plate reaches the retracted eye position. If the push plate is stopped between the forward limit position and the reverse limit position due to solid debris being caught in between, when the push plate is operated to feed the push plate with the push plate actuating cylinder when opening the tailgate. Often, excessive force is applied to each part of the garbage loading device, damaging it, or the tailgate cannot be opened because the pushing plate cannot reach the retraction limit position, resulting in problems in actual garbage processing operation. This has become a big problem.

[Means for solving problems]

The present invention deals with this problem, and includes a tailgate whose upper end is pivoted to the rear end opening of the garbage storage box so as to be able to open and close freely, and a rotary plate that is driven to rotate in the normal direction so as to scoop up the input garbage forward.
A garbage loading device including a pushing plate for loading the scraped garbage on the rotary plate into the garbage storage box, and a stopper with which the pushing plate engages at the retraction limit position are installed, and the engagement between the stopper and the pushing plate is installed. In a garbage vehicle configured to open and close a tailgate relative to a garbage storage box with a push plate actuating cylinder through a push plate operation cylinder, the rotary plate reversing circuit is electrically connected when a tailgate opening/closing control switch is switched to the open side; and a detector that emits a signal when the dust is reversed from the stop position for loading garbage into the garbage storage box by a certain angle or for a certain period of time that allows the debris stuck between the pushing plate and the pushing plate to be released, and the detector emits a signal. The rotary plate reversing circuit is cut off by the signal, and a circuit for operating the pushing plate actuating cylinder toward the cheelgut opening side is automatically turned on, so that the circuit is automatically made conductive when the tailgate is opened, prior to the opening of the tailgate. , the rotary plate ttiJ is characterized by being reversely rotated for a certain angle or a certain period of time from the garbage loading stop position. [Function] According to the above configuration, when discharging garbage and garbage from inside the container,
When the tailgate opening/closing control switch is closed to the open side, before the tailgate is opened (raised), the rotary plate is reversely rotated by a certain angle or for a certain period of time from the stop position where loading into the garbage storage box is possible. The debris trapped between the plate and the push-in plate is released, and then the push-plate actuating cylinder is automatically operated to open the tailgate by the signal emitted by the detector when the rotating plate completes reverse rotation. is the retreat limit/
The tailgate is opened by actuation in the same direction of the pusher plate actuating cylinder after it has engaged the stopper on the tailgate side in this position. Therefore, even if solid debris is caught between the rotating plate and the pushing plate and the pushing plate is stopped at an unstable position where it does not engage with the stopper, the pushing plate rotates until it engages with the stopper. Later, the tailgate will begin to open, so the tailgate that is in the middle of opening will have to straighten the push plate.
There is no risk of it falling until it is engaged with the pad.

〔Example〕 .

The figure shows one embodiment of the present invention, in which 1 is a chassis of a garbage truck, 2 is a chassis of a garbage truck;
is a garbage storage/box mounted on the rear part of the chassis 1; 3 is a tail gate that opens and closes the rear end opening of the garbage storage box 2; a garbage loading device 4 is attached to the tailgate 3; It will be done. The lower rear end of the garbage storage box 2 is pivotally connected to the chassis 1 with a pin 5, and a dump cylinder 6 is attached between the chassis 1 and the dump cylinder 6.
The garbage container can be tilted backwards. The top front end of the tailgate 6 is pivotally mounted on the top of the rear end of the garbage storage box 2 by a bin 7. The garbage loading device 4 is connected to the arcuate bottom plate 3a of the tailgate 3, which has a garbage inlet 8 at the rear end. A rotary plate 10 attached to the rotary shaft 9 in the tailgate and the rotary plate and the scraped garbage on the rotary plate can be pushed into the garbage storage box so as to work together to scrape up the thrown garbage forward. , a push-in plate 12 whose upper end is pivotally supported 11 in the tailgate, and the rotary plate 10 is connected to a rotary plate actuating motor 16 (a third
(Fig.) enables forward and reverse driving. Further, the pushing plate actuating cylinder 14 is connected to the extension arm 1 above the shaft support 11 of the pushing plate 12.
2a and the top of the rear end of the garbage storage box 2 are connected above the tailgate pivot bin 7. This push plate operating cylinder 14 not only provides the normal stroke necessary to rotate the push plate 12 back and forth between the forward limit position shown by the solid line in FIG. 2 and the water position shown by the dashed line in FIG. with the necessary strokes.

Reference numeral 15 denotes a stopper fixed within the tailgate 3 so that the push plate 12 is engaged at the retraction limit position shown in FIG.

Further, reference numeral 16 denotes a hook of a lashing device fixed to a support shaft 17 rotatably supported at the lower rear end of the garbage storage box 2;
6 engages and disengages from a latch 20 protruding and fixed to the lower front surface of the tailgate 6 in the closed position by expanding and contracting a lock cylinder 19 that connects an arm 18 fixed to a support shaft 17 and the lower part of the garbage storage box 2. .

FIG. 3 shows a hydraulic circuit, including an electromagnetic switching valve v1 that controls expansion and contraction of the dump cylinder 6, and push plate operating cylinders 14 on both sides.
an electromagnetic switching valve v2 that controls expansion and contraction, and a rotary plate operating motor 1
3 is an electromagnetic switching valve V3 capable of forward and reverse rotation, and a hydraulic pump P
At the same time, an electromagnetic switching valve v4 for controlling expansion and contraction of the lock cylinder 19 is connected in parallel with the electromagnetic switching valve ■1 etc. to the discharge port of the hydraulic pump, and the push plate operating cylinder 14 is opened. A normally closed solenoid valve v5 with a throttle is installed between the cylinder chamber 14a on the piston rond side of the push plate actuating cylinder and the oil tank T so that it can be closed by the weight of the tailgate 6 inside. A check valve Cv is connected between the chamber 14b and the oil tank T, respectively. 5OLI and 5OL2 are solenoids that respectively switch the switching valve v1 to the extension side and contraction side of the dump cylinder, 5OL3 and 5OL4 are solenoids that respectively switch the switching valve v2 to the contraction side and extension side of the push plate actuating cylinder, and 5OL5 and 80L6 are switches, respectively. A solenoid that switches valve ■3 between the forward rotation side and the reverse rotation side of the rotating plate.
SQL7 and 5OL8 are solenoids that respectively switch switching valves 4 to the contraction side and extension side of the lock cylinder, SQL9 is a solenoid for opening solenoid valve v5, and RV is a relief valve.

Next, we will explain the electric circuit in Figure 4. 08W1 is a loading and unloading switch connected to power supply B, SW2
is a push button switch for starting loading, SW3 is rotary plate 1
SW4 and SW5 are pushbutton switches for moving the push plate 12 forward and backward, respectively.
W6 is a valve button switch for stopping the loading operation, SW7 is a telescopic control switch for the dump cylinder 6, and SW8 is an opening/closing control switch for the tailgate 6 equipped with an interlocking switch swa'. A limit switch LS2 is a limit switch that is switched to the No contact side only during approximately 45 degrees of rotation in the normal rotation direction A from the stop position for loading garbage into the garbage storage box, as shown in . LS3 is a limit switch that is switched to the No contact side, LS3 is a limit switch that is switched to the No contact side only while the rotary plate 10 rotates about 10 degrees in the normal rotation blade direction A from the garbage loading stop position, L84 is a push plate 12 N when it moves forward slightly behind the forward limit position.

0LS5 is a limit switch that can be switched to the contact side.
is a limit switch that is switched to the No contact side when the rotary plate 10 rotates approximately 45 degrees in the reverse direction (downward) from the garbage loading stop position, and includes an interlocking switch LS5'. L
S6 is a switch that is switched to the No contact side when the tailgate 3, which is closed from the open position, comes into contact with the storage box 2. LS7 is No when hook 16 is released.
This is a limit switch that can be switched to the contact side, and is equipped with an interlocking switch LS7'. LS8 is N when the tailgate 6 is opened at a predetermined angle with respect to the garbage storage box.

A safety switch that can be switched to the contact side, SW9 is a push button switch that activates the communication buzzer BZ in the driver's cabin, CRI is a relay with normally open contacts CRI' and CRI'', and R80L is a rotary solenoid for adding hydraulic pump-driven engines. 〇It is assumed that each of the above-mentioned rear butt switches is installed on the outside of the tailgate.D.
E, F.

G, H, and J each indicate a rectifier.

The circuit of FIG. 4 shows the garbage loading device 4 stopped in the state shown in FIG. are at the loading stop position, the limit switches LSI and LS3 are each switched to the NC contact side, and since the push plate 12 is at the forward limit position, the limit switch LS4 is also switched to the NC contact side.

To start loading the garbage thrown into the tailgate from this state, close the changeover switch SWI to the loading side (right side in the figure) and close the loading start pushbutton switch SW2. ．． SW5. SW4.
The normally closed contact of SW3 and switch SW2 are sequentially valved to make relay C'RI conductive, and its relay contacts CRI' and CR
Since the contact CRI" is closed, the rotary linenoid R80L becomes conductive and increases the driving power of the hydraulic pump P, and the contact CRI" and the switch LS3. The solenoid 5OL5 is brought into conduction via the LS4, the switching valve V3 is switched to the left position in FIG. 3, and the motor 16 drives the rotary plate 1o in the normal rotation direction A. When the rotating plate 10 rotates approximately 10 degrees, the switch LS3
Since the actuator disengages from the first cam attached to the outer end of the shaft 9 and closes the NC contact side of the switch, even if the pushbutton switch SW2 is opened, the relay CRI becomes conductive through the rectifier. At the same time, the solenoid SQL 5 is maintained in a conductive state via the rectifier E, and the rotating plate 10 continues to rotate normally.

When the rotating plate 10 further rotates and the actuator of the switch LSI comes off the second cam attached to the outer end of the shaft 9, the switch LSI closes to the NC contact side and the solenoid 80L3 becomes conductive, so that switching is performed. Valve v2 is switched to the left position in FIG. 3, and the pusher plate actuating cylinder 14 contracts to retract the pusher plate 12. When the push plate 12 starts to retreat, the switch LS
4 is switched to the NC contact side, but switch LS3 is
Since it is switched to the C contact side, solenoid 5QL4
is not conductive.

The push plate 12 retreats to just before the retreat limit position and switches L.
When S2 is switched to the NC contact side, the solenoid 5OL3 of the push plate retraction circuit is demagnetized to stop the push plate 12, but at the same time, the switch LS2 maintains the relay CRI in the conductive state, and the rectifier F makes the solenoid 5OL4 conductive. 0 Therefore, the rotary plate 10 continues to rotate further,
When the rotating plate returns to the loading stop position after scraping up the input garbage forward, switch LS3. Since both LSIs are switched to the NC contact side, the solenoid 5OL5 becomes non-conductive, stopping the motor 16 or the rotating plate 10, and
Since the NC contact side of the switch LS4 is closed, the solenoid 5OL4 becomes conductive, and the pushing plate 12 starts moving forward, pushing the scraped dirt on the rotary plate 10 into the storage box 2. In this case, when the push plate 12 starts moving forward, the switch LS2 returns to the NC contact side, but the switch LS4 maintains conduction of the relay CRI via the rectifier F, allowing the push plate to be driven.

When the push plate 12 reaches the forward limit position and the switch LS4 is switched to the NC contact side, the solenoid 5OL4 becomes non-conductive and stops the extension operation of the push plate actuating cylinder 14, and at the same time, the relay CRI becomes non-conductive. The garbage loading device 4 stops in the state shown in FIG. Therefore, by pressing switch SW2 every time you throw garbage into the tailgate,
The input garbage is loaded into the storage box 2.

When the loading of garbage into the storage box 2 is completed in this way, the garbage truck is driven to a garbage processing site and the stored garbage in the storage box is discharged. This discharge operation will be explained below.

First, close the changeover switch SW1 to the discharge side (left side in Fig. 4), then close the tailgate opening/closing control switch SW8. SW8
/ when closed to the open side (right side in the figure), the switches S
WI, SW8. LS5. Solenoid 5 via rectifier G
OL6 becomes conductive, switches the switching valve v3 to the right position in FIG. 3, and the motor 16 rotates in the reverse direction to rotate the rotary plate 10, which is in the loading stop position, downward. The rotary plate 10 is rotated approximately 45 degrees and the switch LS5. When LS5' is switched to the NC contact side, solenoid 5OL6 becomes non-conductive and motor 16
At the same time, switch LS5. Since the solenoid 5OL7 conducts through LST and switches the switching valve v4 to the right position in FIG. 3, the lock cylinder 19 contracts and the tailgate 6 is unlashed by the lashing device (16, 20). At the same time, switch SW8', LS5 z, L
Solenoid 5OL2 becomes conductive via S7' in sequence,
The switching valve v1 is switched to the right position in FIG. 3, the dump cylinder 6 is activated to contract, and the storage box 2'ff is securely and stably supported by the chassis 1.

The lashing device (16, 20) is released and its hook 16 is connected to the switch LS7. When both LS7' are switched to the right NC contact side, the solenoid SQL? , 5QL2 are both rendered non-conductive, stopping the operation of the lock cylinder 19 and dump cylinder 6, and the switches LS5. LS7, the solenoid 5OL3 conducts through the rectifier H, switches the switching valve v2 to the left position in FIG.
to retreat. At this time, since the rotary plate 10 is rotated approximately 45 degrees in the opposite direction, as shown by the chain line in FIG. Even if the solid garbage M is strongly caught, or the solid garbage N caught between the tip of the rotary plate 10 that has finished scraping up the garbage and the tailgate bottom plate 6a is rotated to the forward limit position. Even if the pushing plate 12 is strongly bitten, there is no fear that the biting of the dirt will interfere with the backward operation of the pushing plate, and the pushing plate freely rotates to the backward limit position and engages with the stopper 15. After the push plate 12 engages with the stopper 15, as the push plate actuating cylinder 14 further contracts, the tailgate 6 is pulled up and opened in one direction around the pin 7.

In this way, when the tailgate 6 rotates beyond the predetermined angular position shown by the chain line in FIG. 1, the safety switch LS8 closes.
Therefore, when the control switch SW7 is closed to the left side in FIG. 4 to conduct the solenoid 5OLI, the switching valve ■1 is switched to the left position in FIG.
tilts rearward about 45 degrees around the bin 5 to discharge the garbage in the storage box. When the control switch SW7 is closed to the right side in FIG. 4 and the solenoid 5OL2 is turned on after the garbage discharge is completed, the switching valve v1 is switched to the right position in FIG. Since it is placed on top, return the control switch SW7 to the neutral position.

Therefore, when the control switches sws and sws' are closed to the closed side (left side in Fig. 4), the tailgate 6 is open and the switch LS6 is closed to the NC contact side, so the solenoid 5OL7 is conductive and locked. At the same time, the cylinder 19 is activated to contract or the hook 16 is activated to open, the solenoid 80L9 is made conductive, and the solenoid valve v5 is opened. When the 0 tailgate that gradually closes the rear end opening of the storage box 2 is completely closed, the switch LS6 is switched to the No contact side as shown in FIG. The third
Switching to the left position in the figure, the lock cylinder 19 is extended, the hook 16 is engaged with the latch 20, and the tailgate 3 is secured to the storage box 2. Therefore, the control switch sws, sws
', return swi to the neutral position shown.

The embodiment in which the limit switch (detector) L85 issues a signal when the rotary plate 10 is reversed by a certain angle from the garbage loading stop position has been described above. A timer relay may issue a signal when the rotating plate is reversed.Also, a lashing device (16 ，
20) is not a necessary condition of the present invention; the release circuit of the lashing device is made conductive by switching the tailgate opening/closing control switch to the open side, and a signal indicating the completion of release of the lashing device is sent. If the rotary plate reversing circuit may be made conductive in response to this, the lashing device may be manually released in advance at the time of discharging the garbage.

〔Effect of the invention〕

In the present invention, by reversing the rotating plate downward prior to retracting the pushing plate and opening the tailgate,
Since the dust trapping between the rotary plate and the push plate is eliminated, if solid dust gets caught between the two, the tailgate is opened by the push plate actuating cylinder via the dust catch part. When opening the tailgate, there is no risk of the parts of the garbage loading device being damaged due to excessive force, or the tailgate falling while it is being opened until the pushing plate hits the stopper, and the tailgate can be opened safely. This has the effect that there is no operational problem such as the safety device being activated and the tailgate not being able to be opened unlike the conventional device.

[Brief explanation of drawings]

FIG. 1 is a vertical side view of one embodiment of the present invention, FIG. 2 is a vertical side view schematically showing the arrangement of limit switches, and FIG.
The figure is a hydraulic circuit diagram, and FIG. 4 is an electric circuit diagram. SW8...Tailgate opening/closing control switch, 5QL
6... Solenoid for reversing the rotating plate operating motor 16, L
S5...Limit switch (detector), SQL?・
... Solenoid that contracts the lock cylinder 19 to open the hook 16, LS7... A limit switch that is switched when the hook 16 is completely opened, 5OL3... A solenoid that causes the push plate operating cylinder 14 to open the tailgate.

Claims (1)

[Claims] (1) The tailgate, whose upper end is pivoted to the rear opening of the garbage storage box so that it can be opened and closed, has a rotary plate that rotates in the normal direction so as to scrape up the input garbage forward, and a rotary plate that rotates in the normal direction to scrape up the input garbage forward. A garbage loading device including a pushing plate for loading into a garbage storage box and a stopper with which the pushing plate engages at the backward limit position are installed, and a pushing plate actuating cylinder is installed through the engagement of the stopper and the pushing plate. In a garbage truck configured to open and close the tailgate with respect to the garbage storage box, there is a rotating plate reversing circuit that is turned on when the tailgate opening/closing control switch is switched to the open side, and the rotating plate stops loading garbage into the garbage storage box. A detector is provided that emits a signal when the reversal occurs at a certain angle or for a certain period of time at which the trapped dust between the push plate and the pushing plate can be released, and the rotating plate reversal circuit is interrupted by the signal emitted by the detector. At the same time, the circuit for operating the pushing plate actuating cylinder to the tailgate opening side is configured to be automatically conductive, so that the rotary plate is moved to the above-mentioned garbage loading position prior to opening the tailgate during the opening operation of the tailgate. A safety device for opening and closing a tailgate of a garbage truck, which is characterized by rotating the tailgate in the opposite direction from a stop position at a certain angle or for a certain period of time.