JPH0630724Y2 - Safety control device for garbage trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a safety control device for a garbage truck equipped with a dust loading device.

(Prior Art) Generally, in a dust loading device equipped in a dust truck, a hydraulic device serving as a drive source of the dust loading device is operated and controlled by an electric operating device.

Conventionally, when performing dust loading with a dust loading device, when a worker presses the loading start switch, the loading operation is momentarily started, and the dust loading device continues unless the stop switch is pressed. Is configured to operate.

(Problems to be solved by the invention) Therefore, in such a configuration, when the operator makes an erroneous operation, the loading device does not stop unless a stop operation is performed, which is dangerous and has a problem in safety. .

Further, as a solution to this problem, there is one in which the loading operation is started after a certain time has elapsed after pressing the start switch (see Japanese Patent Laid-Open No. 59-217501). Since the operation does not start immediately after the switch is operated, an unnatural feeling may occur for some workers during regular work.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, an input box equipped with a dust loading device is continuously provided at the opening of a dust storage box, and the dust loading device is electro-hydraulic controlled. In a garbage truck controlled by a device, a starting switch and a timer are provided in an electric circuit of an electric operating device for controlling the loading device, and the starting switch is operated until the set time of the timer elapses after the start switch is operated. The dust loading device is activated only during the contact operation of the, and the electric circuit is provided to operate the dust loading device regardless of the disconnection operation of the start switch after the set time of the timer has passed. is there.

(Embodiment) Hereinafter, as an embodiment of the present invention, a description will be given of a dust loading device composed of a rotating plate and a pressing plate, 1 is a chassis, and 2 is a dust storage box mounted on the chassis 1. The opening 4 is formed in the rear part.

Reference numeral 3 denotes a charging box installed in the opening 4 of the dust storage box 2, which has a charging port 5 formed in the rear portion thereof, and further has a pushing plate 7 and a rotating plate 8 as a dust loading device 6 therein. The plate 7 has its upper end pivotally attached to the inner wall of the throw-in box 3 and swings in the front-rear direction by a pushing cylinder 9 pivotally supported on the upper part thereof.

The rotary plate 8 has its base end axially attached to the inner wall of the throw-in box 3 below the push-in plate 7 and rotates rightward in FIG. 1 within the dust storage chamber 10 formed in the lower portion of the throw-in box 3 as a rotation range thereof. When stopped at a substantially horizontal position, the lower end of the push-in plate 7 swings close to the upper surface of the rotary plate 8.

That is, the rotary plate 8 scrapes up the dust that has been thrown into the dust storage chamber 10 below the input box 3 and stops, and then the pushing plate 7 swings forward to push the dust into the dust storage box 2.

Next, the hydraulic circuit will be described. P is a hydraulic pump, T is an oil reservoir, V2 is an electromagnetic control valve for controlling the pushing cylinder 9 for operating the pushing plate 7, and solenoids SOLe, SO
Has Lf. V3 is a hydraulic motor 11 for operating the rotary plate 8.
Solenoid control valve for controlling solenoids SOLg, SOL
have h.

Next, the electric circuit will be described. B is a power source such as a battery, and SW1 is a changeover switch for loading and discharging dust.

SW2 is a selection switch for selecting whether to carry out the dust loading operation only once or continuously, SW3 (SW
(3 'is also interlocked) is a start switch for loading work, SW4 is a loading work stop switch, SW6 is a reverse switch of the rotating plate 8, SW7 is a forward switch of the pushing plate 7, and SW8 is a backward switch of the pushing plate 7. . Further, LS1 is an electric contact working at the forward limit position of the push-in plate 7, LS2 is an electric contact working at the backward limit position of the push-in plate 7, and LS3 is continuously maintained while the rotary plate 8 rotates forward about 30 degrees from its stop position. It is an electrical contact that works for. CR1 and CR2 indicate relays and contact points cr respectively
1 and cr2. TR1 is a timer, which activates the timer contact tr1 after the set time has elapsed, is provided in the circuit 20, and is connected in parallel with the circuit 30 provided with the relay CR1. Besides, although switches, solenoids, relays and the like without symbols are shown in the drawings, description thereof is omitted because they are not directly related to the present invention.

Next, the loading operation of the present invention will be described.

The electric circuit shown in FIG. 3 is in a state in which the throw-in box 3 is stored and fixed in the dust storage box 2 and the vehicle can run, the pushing plate 7 is at the forward limit position, and the rotating plate 8 is in the normal state. It is in the stop position in and the loading is completed. When starting the loading operation of dust from this state, the changeover switch SW1 is moved to the upper position from the state shown in FIG. 3, and when the loading operation is operated only for one cycle, it is moved to the lower position, and the continuous cycle operation is performed. Select switch SW in the upper position
Switch 2 The case of one cycle operation will now be described. When the dust is put into the throw-in box 3 through the throw-in port 5 and the start switch SW3 is actuated, the current from the power source B is changed over by the changeover switch SW1, the stop switch SW4 and the start switch. It flows to the timer TR1 of the circuit 20 through SW3, and also flows to the relay CR1 of the circuit 30 through SW6, SW7, and SW8.

Therefore, at the same time when the start switch SW3 is actuated, the relay C
Since R1 is also energized, the solenoid SOLg is excited via the relay contact cr1 and the electrical contact LS1 even within the set time of the timer TR1 and the control valve V3 is switched to the left, whereby the hydraulic motor 11 and the rotary plate 8 are rotated normally. Start.

However, if it is within the set time of the timer TR1 and the disconnection operation is performed by releasing the start switch SW3, the circuits 20 and 30 are disconnected.
Is cut off, the power supply to the timer TR1 and the relay CR1 is cut off, and the operations of the hydraulic motor 11 and the rotary plate 8 are stopped.

Therefore, in the case of an erroneous operation, the rotary plate 8 will stop with only a slight rotation operation.

On the other hand, when the contact operation of the start switch SW3 is continued by the normal operation, when the timer TR1 is operated after the set time elapses, the timer contact tr is closed and the current is relay contact cr1 and electric contact LS1. , Solenoid S
As it flows to OLg, the control valve V3 is switched to the left. Therefore, the oil discharged from the hydraulic pump P passes through the control valve V3 and causes the hydraulic motor 11 to rotate normally. On the other hand, the current flowing through the electrical contact LS1 is shunted and flows through the start switch SW3 'to the relay CR2, and the relay CR2 is activated to operate the relay contact cr.
2 is closed, and the self-holding circuit of the relay CR2 is formed here. Further, the current flowing through the relay contact cr1 due to the closing of the relay contact cr2 flows through the relay contact cr1, the selection switch SW2 and the timer contact tr to the relay CR1 and the relay CR1.
Forming a self-holding circuit of, and simultaneously flowing to the timer TR1 connected in parallel.

After that, the timer TR connected in parallel with the self-holding circuit of the relay CR1 even if the start switch SW3 is not pressed.
1 is also energized, and the self-holding of CR1 is connected together with the timer TR1.

When the hydraulic motor 11 rotates and the rotary plate 8 rotates forward about 30 degrees from its stop position, the electric contact LS3 is switched to the upper side, and the electric current flows through the relay contact cr1, the electric contact LS3, the relay contact cr1 and the electric contact LS2. After that, it flows to the solenoid SOLf of the control valve V2. Here, since the control valve V2 is switched to the left position, the discharge oil of the hydraulic pump P flows into the piston rod side oil chamber of the pushing cylinder 9 of the pushing plate 7 via the control valve V2, and is pushed by storing it. At the same time as the plate 7 starts to move backward, the electrical contact LS1 switches. When the electrical contact LS1 is switched, the self-holding of the relay CR2 is released, and the current flowing through the relay contact cr1 is supplied to the solenoid SOLg via the electrical contacts LS1 and LS3 to continue the rotation of the rotary plate 8.

When the pushing plate 7 reaches the retreat limit position and the electric contact LS2 is switched, the current flowing from the relay contact cr1 to the solenoid SOLf is cut off, and the control valve V2 is set to the center positive position.
The pushing plate 7 is stopped.

On the other hand, the rotary plate 8 continues to rotate, and the dust storage chamber 1
When the dust thrown at 0 is picked up and rotated once to reach the original stop position, the electric contact LS3 is switched to the lower position here, so the current flowing from the contact LS3 to the solenoid SOLg is cut off, and the control valve V3 becomes the center positive position, and the rotation of the hydraulic motor 11 also stops the rotation of the rotary plate 8.

At the same time, the current flowing through the electrical contacts LS1 and LS3 passes through the relay contact cr2 and the solenoid SOLe of the control valve V2.
The control valve V2 is switched to the right position. Therefore, the oil discharged from the hydraulic pump P flows into the piston back side oil chamber of the pushing cylinder 9 through the control valve V2, advances the pushing plate 7, and moves the dust scraped up by the rotating plate 8 into the housing box 2. Push in. And the pushing plate 7 reaches the forward limit position,
By switching the electrical contact LS1 downward, the solenoid SO
When the power supply to Le is cut off, the control valve V2 returns to the center position, and the pushing plate 7 stops. At the same time, the self-holding circuit of the relay CR1 is opened, and the one-cycle operation of the loading work is completed here.

On the other hand, when the loading operation is continuously performed, the one-cycle operation described above can be continuously performed by switching the selection switch to the upper position, and the stop is performed by the stop switch SW4.
It can be turned off.

(Effects of the Invention) As described above, according to the present invention, even if the dust loading device is attached to the rear opening of the dust storage box of the dust collection vehicle, even if the start switch is pressed due to an erroneous operation during the loading operation. , If it is within the set time of the timer, by stopping the pressing of the switch, the operation of the rotating plate is stopped and accidents due to erroneous operation can be prevented in advance, which contributes to ensuring the safety of the operator. is there.

In addition, since the rotary plate is activated immediately after the start switch is pressed during the normal loading operation, the work can be continued without giving a feeling of strangeness to the operator.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is an overall side view of a refuse collection vehicle, Fig. 2 is a hydraulic circuit diagram, and Fig. 3 is an electric circuit diagram. 2 ... dust storage box, 3 ... dust input box, 4 ... opening, SW3
… Start switch, TR1… Timer.

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Claims (1)

[Scope of utility model registration request] 1. A garbage collection vehicle in which a loading box equipped with a dust loading device is continuously provided at an opening of a dust storage box, and the dust loading device is controlled via an electro-hydraulic control device. A starter switch and a timer are provided in the electric circuit of the electric operating device that controls the device, and after the contact switch of the starter switch operates the dust loading device only during the contacting operation of the starter switch until the set time of the timer elapses. A safety control device for a refuse collection vehicle, which is provided with an electric circuit for operating the dust loading device regardless of whether the start switch is turned on or off after the timer has been set.