JPH0518323Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a safety device for garbage collection vehicles, and in particular, the invention relates to a safety device for garbage collection vehicles, and in particular, the invention relates to a safety device for garbage collection vehicles, and in particular, the present invention relates to a safety device for garbage collection vehicles. The present invention relates to a safety device for a garbage collection vehicle that stops the rotation of a rotating panel if a body enters the vehicle for a predetermined set time or longer.

(Prior art) Generally, a tailgate with a built-in loading device is attached to the rear opening of the garbage storage box of a garbage collection vehicle, and this loading device consists of a rotating panel rotated by a hydraulic motor and a hydraulic cylinder device. It is composed of a push-in panel that is driven to swing back and forth, and both panels work together to load garbage into the garbage storage box. In this type of garbage collection vehicle, the garbage thrown into the sump at the bottom of the tailgate is scooped up by a rotating panel, and then the garbage is pushed into the garbage storage box by a push panel. The loading operation is performed automatically according to the sequence circuit by pressing the automatic loading button.

However, if a part of the worker's body enters the garbage inlet during the garbage loading operation, there is a risk that the worker will be caught and caught in the rotating rotating panel. Furthermore, debris sticking out of the sump may get caught between the tip of the rotating panel and the garbage inlet, causing the rotating panel to temporarily stop. In such cases, it is mandatory to press the emergency stop button on the loading cycle to stop the operation, but in reality, contrary to the instructions in the work manual, removal work is carried out without pressing the emergency stop button. The rotating panel rotated the moment the piece of dust came off, and there was a risk that the worker's hand might get caught in the rotating panel.

To solve this problem, we use a light beam to detect when a body part, garbage, or other obstacle enters the inside of the garbage inlet, and activate a photoelectric switch to temporarily stop the rotation of the rotating panel. (Mikoaki)
(Refer to Publication No. 60-26003), an example in which a switch for stopping loading is provided over the entire width of the rim of the input port (Refer to Publication No. 60-26003).
33931) has been proposed.

(Problem to be solved by the invention) However, in the above-mentioned conventional garbage collection vehicle, the optical path of the light beam is set inside the tailgate, and there are debris particles on the optical path of the light beam projected from the projector. Even if the safety circuit is present or the worker's body temporarily enters during normal operation, the safety circuit will be activated and the loading cycle will be stopped. As a result, there is a problem that there is no distinction between cases where it is necessary to stop the loading work due to danger and cases where there is no need to stop because the work is normal, and the work ends up being stopped.
In order to resume work, an automatic button had to be pressed each time, which worsened work efficiency and made it impossible to ensure necessary and sufficient safety.

Therefore, the purpose of this invention is to solve the above-mentioned problems with conventional garbage collection vehicles, and to solve the problem that if a worker or the like temporarily enters the garbage collection vehicle just before the garbage input port, the safety circuit will not activate and the worker will To provide a safety device for a garbage collection vehicle which can temporarily stop an automatic loading cycle after a predetermined set time has elapsed when there is a risk that a person's body may enter a garbage inlet and become entangled.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an automatic loading relay circuit including a self-holding circuit, a relay and a solenoid for driving the rotating panel and push panel of the loading device. and a safety circuit including a proximity switch and relay for detecting an object present in a detection area near the garbage input port immediately before the garbage input port, and a safety circuit including a proximity switch and a relay that detects an object present in the detection area in the vicinity of the garbage input port, and outputs an output signal from the proximity switch. The solenoid operating circuit of the drive unit is cut off, and when the output signal from the proximity switch continues for a certain period of time after the set time has elapsed, the self-holding circuit is released and the automatic loading control circuit is released. It is characterized by what it did.

[Effect]

According to this invention, when a worker's body enters just before the garbage inlet during automatic loading operation, a proximity switch detects this and activates a relay to cut off the solenoid operating circuit. The loading relay circuit is self-held, and when the output signal of the proximity switch continues for a set time or longer, the signal from the timer relay acts to release the self-holding circuit of the automatic loading relay circuit.

(Embodiment) An embodiment of the safety device for a garbage collection vehicle according to the present invention will be described below with reference to the drawings.

In FIG. 1, numeral 1 indicates a garbage storage box;
A tailgate 2 is pivotally attached to the upper end of the rear opening so as to be openable and closable, and a sump 4 for temporarily storing dust is provided at the bottom of a pair of side plates 3, 3 of the tailgate 2. . A rotating shaft 5 is horizontally mounted between the side plates 3 and 3 in the lower region of the tailgate 2, and a panel-shaped rotating panel 6 rotated by a hydraulic motor is integrally mounted on the rotating shaft 5. is fixed to. Further, a rotatable pivot shaft 7 is mounted above the rotation shaft 5 and between the side plates 3, 3, and a panel-shaped push-in panel 8 is fixed to the pivot shaft 7.

In the garbage collection vehicle configured in this way, when the automatic loading button is pressed when loading garbage, the rotary panel 6 rotates clockwise, and after a slight delay, the push panel 8 begins to return backwards, and this push plate 8 stops at the rear limit position, and during this time the rotating panel 6
The rotary panel 6 stops when the dust inside is scooped up and the scooping surface matches the floor of the dust storage box 1. Then the push panel 8 starts its forward movement,
The garbage on the rake surface of the rotating panel 6 is removed from the garbage storage box 1.
Push it in to complete the loading cycle.

By the way, it is very dangerous if a worker or the like approaches the garbage inlet 12 abnormally during automatic loading operation by rotating the rotary panel 6. Furthermore, if the removal work is performed without pressing the emergency stop button to remove a piece of dust caught between the tip of the rotating panel 6 and the lower edge of the garbage inlet 12, the rotating panel 6 may suddenly rotate. It is dangerous. In order to ensure safety in such cases, the present invention takes the following safety measures. That is, according to the present invention, the tailgate 2
A proximity switch 14 is used to detect that a worker or the like has abnormally approached just before the garbage inlet 12.
The proximity switch 14 is composed of one or more proximity switches or photoelectric switches installed diagonally above the input port, and detects when the body of a worker or the like enters the shaded detection area A. It is designed to emit an output signal.

Next, an electric control circuit diagram including the above-mentioned proximity switch 14 will be explained with reference to FIG.

That is, in the figure, L ₁ and L ₂ indicate DC power lines including a DC power source E, a fuse 15, and a main switch 16, and an emergency stop button switch 17 is incorporated in the DC power line L ₁ .
The circuit also includes an automatic loading relay circuit B, a solenoid working circuit C including a solenoid, and a safety circuit D.

Of these, the automatic loading relay circuit B includes a relay CR1 that increases the speed of the engine, and a rotating panel 6.
, a relay CR2 for rotating the push plate 8, a relay CR3 for moving the push plate 8 forward, and a relay CR4 for moving the push plate 8 backward. Relay CR4 is switched by No. 1 switch, and relay CR3 and relay
CR4 is switched by No. 2 switch. Also, relay CR3 and relay CR1 are switched by No. 3 switch, and relay CR2 and relay CR3 are switched by No. 3 switch.
and can be switched by No. 4 switch. The above No. 2 switch and No. 3 switch connect the power line L ₁ via the a contact C _r1a-1 of relay CR1.
It is connected to the. Note that D ₁ , D ₃ , and D ₄ indicate diodes.

On the other hand, the solenoid working circuit C includes a rotary solenoid R-SOL, SOL1 for rotating the rotary panel 6, SOL2 for moving the pushing plate 8 forward, and SOL3 for moving the pushing panel 8 backward.
Rotary solenoid R-SOL and relay CR1 a
Contact C _r1a-2 and the normally closed contact of relay CR5, which will be described later.
C _r5b-1 is connected in series between power lines L ₁ and L ₂ . In addition, the SOL1, the a contact C _r2a of the relay CR2, and the pushbutton switch PB _2a are connected in series to the power lines L ₁ and L _{2 .}
connected between. Furthermore, the a contact C _r3a of the relay CR3 is connected in series to SOL2, and the a contact C _r4a of the relay CR4 is connected in series to SOL3.

On the other hand, safety circuit D includes a proximity switch 14,
This proximity switch 14 and relay CR5 are connected in series between power lines L ₁ and L ₂ . Furthermore, the a contact C _r5a-1 of the relay CR5, the b contact T _crb-2 of the on-delay type timer relay TCR, which opens the contact after a certain period of time, and the pilot lamp PL are connected in series, and the pilot lamp PL is connected in series with the pilot lamp PL. A timer relay TCR is connected in parallel.

Next, the loading operation and the function of the safety circuit will be explained with reference to FIG.

Before starting automatic loading, the rotating panel 6 is in a position where its rake surface is aligned with the floor surface of the garbage storage box 1, the push panel 8 is in the forward limit position, and the No.
Each of the switches No. 1 to No. 4 is located at the position shown by the solid line in FIG.

To start an automatic loading operation, first press the automatic loading button.
Press PB _1a . Then, the button switch _PB2a is linked and closed, and the relay CR1 is energized. Then, the a-contacts C _r1a-1 and C _r1a-2 of the relay CR1 are closed, and the relay CR2 is energized, and the a-contact C _r2a is closed, SOL1 is energized, and the rotating panel 6 rotates in the forward direction.
When the rotating panel 6 has rotated slightly clockwise,
No. 3 switch switches to the dashed line position and the diode
Excitation of relay CR2 is self-maintained through _D4 , and relay CR1 is self-maintained through diode _D1 , and automatic loading continues even if the automatic loading button _PB1a is released. Next, the No. 1 switch switches to the dashed line position, relay CR4 is energized, and its a contact
C _r4a is closed, SOL3 is energized, the push-in panel 8 starts to move backward, and while the rotary panel 6 continues to rotate forward, the push-in panel 8 reaches the retreat limit position, and No.
2 switch is switched to the dashed line position, and a second self-holding circuit for relay CR1 is formed. Rotating panel 6
continues to rotate in the normal direction and when it reaches the position shown by the broken line in Figure 1, the No. 3 switch is switched to the solid line position, the relay CR2 is demagnetized, the normal rotation of the rotating panel ₆ is stopped, and at the same time the self Release the holding circuit. When the No. 3 switch is switched to the solid line position, the relay CR3 is energized through the No. 4 switch that is switched to the broken line position, closes the a contact C _r3a , energizes SOL2, and moves the push panel 8 forward.
Push the garbage on the rotating panel 6 into the garbage storage chamber,
The push panel 8 stops at the forward limit position, and the No. 2 switch is switched to the solid line position to complete one loading cycle.

The normal loading cycle has been explained above, but as shown in Fig. 1, there are cases where a worker approaches the garbage inlet 12 abnormally and becomes dangerous, or when the operator approaches the garbage inlet 12 during the loading operation, as shown in Figure 1. Lower edge and rotating panel 6
The operation of the safety circuit will be explained in the event that a piece of dust is caught between the tip of the machine and a worker approaches to remove it.

When a worker or other object to be detected enters the detection range A shown by the broken line behind the loading port during the loading operation, the proximity switch 14 is activated and the relay CR5 is energized. Then, relay CR5 becomes a normally closed contact.
C _r5b-1 is opened to stop the operation of the solenoid working circuit C, and the movement of the rotating plate 6 and the pushing plate 8 is immediately stopped.

On the other hand, the A contact C _r5a-1 of relay CR5 closes the contact, and the pilot lamp PL and timer relay
The TCR is energized and the pilot lamp PL lights up. During this time, the loading operation is stopped, but the automatic loading relay circuit B section is energized, and the operation and self-holding circuit of the B section are stored as they are.

After the timer relay TCR is energized, when the set time T seconds has elapsed, the b contact T _crb-1 of the automatic loading relay circuit B section opens, and at the same time, the automatic operation self-holding circuit is opened and the contact T _crb-2 is opened. The opening pilot lamp PL goes out and all operation and control circuits also stop.

Even if the proximity switch 14 is activated and the solenoid operation circuit C is stopped, if the object to be detected leaves the detection range A of the proximity switch 14 within the set time T seconds of the timer relay TCR, the control circuit B will remain in memory. Since the self-holding circuit remains configured, the suspended loading operation is automatically restarted.

In addition, automatic loading button PB _2a is designed to be linked with automatic loading button PB _1a , and automatic loading button PB _1a or
Loading operation is possible while either PB _2a is pressed.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the proximity switch detects the approach of the garbage collection vehicle to the garbage inlet during loading operation, and temporarily stops the solenoid operating circuit of the loading device. Since the self-holding circuit of the automatic loading relay circuit is released after a predetermined period of time has elapsed, the loading device can be activated when a detected object enters the detection area near the garbage inlet just before the garbage input. It immediately stops to ensure safety, continues automatic operation again after the object to be detected is removed, and then restarts the drive unit of the loading device when the object remains within the detection area for a predetermined period of time. Safety can be ensured by stopping all of the control units. As described above, according to the present invention, dangerous conditions can be detected and controlled by classifying them into temporary and continuous conditions, and the device can function as a safety device to the fullest without impairing workability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a garbage collection vehicle to which the present invention is applied, and FIG. 2 is an electrical control circuit diagram showing a safety circuit according to the present invention. 6...Rotating panel, 8...Pushing panel, 14...
...Proximity switch, TCR...Timer relay.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An automatic loading relay circuit including a self-holding circuit, a solenoid operating circuit including a relay and a solenoid that drive the rotating panel and pushing panel of the loading device, and immediately before the garbage input port. The sensor is equipped with a safety circuit including a proximity switch and a relay to detect an object present in the detection area near the garbage inlet, and the output signal from the proximity switch quickly disconnects the solenoid operating circuit of the drive unit. , the safety of a garbage collection vehicle, characterized in that when the output signal from the proximity switch continues for a certain period of time after a set time has elapsed, the self-holding circuit is released and the automatic loading control circuit is released. Device. 2. Registration of a utility model, characterized in that the safety circuit relay is an on-delay type timer relay that is started by the output of a proximity switch, and its normally closed contact is incorporated into the automatic loading control relay circuit. A safety device for a garbage truck according to claim 1.