JPH0549561B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a safety control device for a garbage collection vehicle.

(Prior Art) A conventional garbage collection vehicle is known in which the rotation of the rotary plate is temporarily stopped when an obstacle is detected in the input port while the rotary plate is passing through the input port. Yes (see Utility Model Publication No. 60-26003).

(Problem to be Solved by the Invention) However, in such a garbage collection vehicle, stopping the rotary plate after confirming that there is an obstruction in the input port may be a reactive measure; During this time, dust often began to accumulate, and if the rotary plate stopped each time, there would be problems such as interfering with work.

(Technical means for solving the problem) The present invention includes a garbage storage box mounted on a vehicle frame,
A garbage collection consisting of a garbage input box which is connected to the rear opening of the garbage storage box so as to be tiltable, and which is equipped with a garbage processing device consisting of a rotating plate and a pushing plate inside the garbage storage box, and has a garbage input opening formed at the rear thereof. a bypass circuit that is connected to a normal rotation side high pressure circuit of a hydraulic motor that drives the rotary plate and communicates with an oil reservoir via an electromagnetic switching valve and a pressure control valve;
An electrical contact is provided in the garbage input box to detect that the rotary plate is rotating in a predetermined range from above to below the input port, and the rotary plate is provided within a certain range from the input port when rotating in the predetermined range. and a detector that detects a certain obstacle, and when the detector is activated, the electromagnetic switching valve is switched and the pressure control valve is activated to flow the pressure oil back to the oil reservoir and reduce the rotational force of the rotating plate. It is characterized by the fact that

(Function) After inputting garbage from the input port, the rotating plate starts rotating forward by operating the start switch, and when it rotates by a certain angle, the pushing plate is simultaneously moved backward, and the pushing plate reaches the backward limit position. Even after the rotating plate stops, the rotating plate continues to rotate normally, scraping up the garbage thrown into the bottom of the garbage disposal box, and when it reaches the operation start position after making one revolution, the rotating plate stops rotating. Thereafter, the pushing plate moves forward and the garbage on the rotary plate is pushed into the garbage storage box.

By the way, if a worker or the like enters the detection range of the detector installed in the input box while the rotary plate rotates across the input port, the detector switches the solenoid valve and sets the pressure to low. The pressure control valve operates, and most of the pressure oil flows through the bypass circuit to the oil reservoir without passing through the rotary plate drive hydraulic motor. As a result, when a certain amount of resistance is encountered in a predetermined section, the drive torque of the hydraulic motor becomes extremely small compared to normal drive torque, which prevents accidents such as damage to parts of the body due to the rotating plate. Prevented.

(Example) Examples of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a garbage collection vehicle, in which a garbage storage box 3 is placed on a vehicle frame 2, and the garbage storage box 3 is pivoted by a dump cylinder 4 installed between the vehicle frame 2 and the garbage storage box 3. It can be tilted freely around the part. A garbage input box 7 is connected to the rear opening 3a of the garbage storage box 3, and a garbage input box 7 is pivotally mounted above the rear opening 3a. is equipped with a garbage processing device 9.

The garbage processing device 9 includes a push plate 10, a rotary plate 11, a push cylinder 12 which is a hydraulic actuator for driving them, and a hydraulic motor 13.
(See Figure 2), and the pushing cylinder 1
2 has a normal stroke necessary to swing the push plate 10 and a stroke necessary to open the garbage input box 7.

That is, a stopper 14 is fixed to the inner wall of the garbage input box 7, and the upper part of the pushing plate 10 is connected to the stopper 1.
By further contracting the pushing cylinder 12 while it is in contact with the container 4, the garbage input box 7 is tilted.

On the other hand, a lashing cylinder 15 whose one end is pivotally supported is disposed at the rear of the rear surface of the garbage storage box 3, and the other end is connected to a lashing claw 16 pivotally supported at the bottom of the garbage storage box 3, and is normally secured. Lashing claw 1 via cylinder 15
6 is engaged with a U-bolt 17 fixed to the front surface of the garbage input box 7, thereby securing the garbage input box 7 to the garbage storage box 3.

In addition, a detector 21 is disposed at the bottom of the garbage input box 7, and a detector 21 is installed at the bottom of the garbage input box 7, so that a worker or the like can be detected within a certain range l behind the input port 8 (for example,
m), and specifically consists of an ultrasonic sensor or the like.

Next, the hydraulic circuit will be explained with reference to FIG.
P is a hydraulic pump, T is an oil reservoir, V1 is an electromagnetic control valve that controls the dump cylinder 4, V2 is an electromagnetic control valve that controls the push cylinders 12 for swinging the push plate 10 and tilting the garbage input box 7, and V3 is the rotation These electromagnetic control valves V1, V2, and V control the hydraulic motor 13 for rotating the plate 11.
3 is arranged in series with the discharge pipe of the hydraulic pump P. In addition, each electromagnetic control valve V1, V2, V3 has a spool operating solenoid SOLC, SOLD,
Equipped with SOLE, SOLF, SOLG, and SOLH.
V4 is an electromagnetic control valve that controls the lashing cylinder 15;
It has spool operating solenoids SOLA and SOLJ, which are arranged in parallel with the electromagnetic control valves V1, V2, and V3.

Further, V5 and V6 are solenoid valves that control the extension of the push cylinder 12, and are disposed close to the push cylinder 12 in a circuit communicating with the rod side oil chamber of the push cylinder 12, and act as a solenoid for operating the spool.
It has SOLK and SOLL.

Further, a bypass circuit 19 communicating with the oil reservoir T is connected to the normal rotation side high pressure circuit 18 between the electromagnetic control valve V3 and the hydraulic motor 13, and a bypass circuit 19 communicating with the oil reservoir T is connected to the electromagnetic control valve V7 and a low pressure control circuit downstream thereof. A low pressure relief valve 20 is arranged in series as a valve. The solenoid valve V7 is a solenoid for operating the spool.
Has SOLM.

Next, regarding the electric circuit, see Figures 3, 4, and 5.
This will be explained using figures. B is the power supply such as battery, BZ
1. BZ2 is a buzzer, SW1 is a changeover switch that selects loading work and discharge work, SW2 is a selection switch that selects whether to continue the garbage loading work singly (once) or in conjunction (continuously). SW3 is the operating switch during loading work, SW4 is the garbage input box 7
Stop switches during loading work are installed on the left and right sides of the
SW5 is a communication switch for the buzzer BZ1, SW6 is a reversing switch that independently reverses rotation of the rotary plate 11,
SW7 is a push switch that pushes the push plate 10 independently, SW8 is a reversal switch that independently reverses the push plate 10, SW9 is an open/close switch that opens and closes the garbage input box 7, and SW10 tilts the garbage storage box 2. The dump switch SW11 is a safety switch that selects whether or not to operate the pressure control valve.

Next, LS1 is an electric contact that operates at the forward limit position of the push plate 10, LS2 is an electric contact that operates at the backward limit position of the push plate 10, and LS3 is an electric contact that operates when the rotary plate 11 corrects a predetermined angle from its scraping stop position. LS4 is an electric contact that operates continuously while the garbage storage box 3 is in the traveling position, and LS5 is an electric contact that operates when the garbage storage box 7 is tilted at a predetermined angle. LS6 is an electrical contact that is activated when the garbage input box 7 slightly opens with respect to the garbage storage box 3, LS7 is an electric contact that is activated when a power take-off device (PTO) (not shown) is operated, and LS8 is a fixed electric contact. LS9 is an electric contact that operates when the locking claw 16 is in the locked state; LS9 is an electric contact that operates while the rotary plate 11 is rotating in a predetermined section from the top to the bottom of the input port 8; and 21a is a detector. 21 is an electrical contact that operates when the operator is detected.

R1, R2, R3, R4, R5, R6, R7 are relays, and contacts r1, r2, r3, r4, r5,
It is equipped with r6 and r7. The aforementioned switch group includes selection switch SW2, operation switch SW3,
One stop switch SW4, communication switch SW5,
The reverse switch SW6, push switch SW7 and reverse switch SW8 are connected to the garbage input port 8 of the garbage input box 7.
Near the left side, also the other stop switch SW
4. The safety switches SW11 are installed on the right side near the garbage inlet 8, while the
SW1, open/close switch SW9 and dump switch
SW10 is arranged inside the driver's seat.

Next, the operation of the present invention will be explained. In the push-in completed state shown in FIG. 4, the electrical contacts LS1 and LS3 are switched to the lower position in FIG. 3. After switching the changeover switch SW1 from this state to the upper position, if the loading operation is to be performed in one cycle, the selection switch SW2 is turned to the single-acting position. In this case, it is assumed that the safety switch SW11 is in the release position.

Then, when garbage is dumped from the input port 8 of the garbage input box 7 and the operating switch SW3 is turned on, a current flows to the relay R1 and self-holds the relay R1 through its a contact r1 and b contact r4. Also,
It also flows to relay R5 via electrical contact LS1, and energizes solenoid SOLG via its a contact r5.

At this time, since the electrical contact LS3 is switched downward, the relay R5 is self-held via the a contact r5. As a result, the electromagnetic control valve V3 is switched to the left position, the hydraulic motor 13 is activated, and the rotary plate 11 starts rotating forward.

When this rotary plate 11 rotates through a predetermined angle, the electrical contact LS3 returns to the upper position, so the current flows through the electrical contact.
It flows to relay R3 via LS3 and b contact r4, and flows to relay R2 via its a contact r3 and electrical contact LS2.

Therefore, the current flows through the a contact r3 to the solenoid SOLG, and at the same time continues the forward rotation of the rotating plate 11, the current flows through the a contact r2 to the solenoid SOLF.
, the electromagnetic control valve V2 is switched to the left position, the pushing cylinder 12 is contracted, and the pushing plate 10 is moved backward (reversed).

At this time, by reversing the push plate 10, the electrical contact
Since LS1 switches upward, electrical contact LS3
Along with the upward switching, the power supply to relay R5 is cut off.

Then, when the push plate 10 reaches the retraction limit position, the electric contact LS2 switches and the power to the relay R2 is cut off, so the a contact r2 is opened,
Energization to solenoid SOLF is cut off.

As a result, the electromagnetic control valve V2 returns to the neutral position and stops reversing the pushing plate 10.

However, since the relay R3 continues to be energized, the rotary plate 11 continues to rotate forward, scraping up the garbage dumped in the garbage disposal box 7 and making one rotation until it reaches the scraping stop position. electrical contacts
Switch LS3 downward.

Therefore, since the power to relay R3 is cut off, electromagnetic control valve V3 returns to the neutral position, and forward rotation of rotating plate 11 is stopped. At the same time, electrical contacts
Flows to relay R4 via LS1, LS3, B contact r5, and self-holds relay R4 via its A contact r4, and flows to solenoids SOLE, SOLK, and SOLL, moving electromagnetic control valve V2 to the right position.
Also, the electromagnetic control valves V5 and V6 are respectively switched to the lower position. Therefore, the pushing cylinder 12 is operated to extend, and the pushing plate 10 moves forward (pushing) to rotate the rotating plate 1.
The garbage above 1 will be pushed into the garbage storage box 3.

After this, when the push plate 10 reaches the forward limit position, the electric contact LS1 switches downward and the current to the relay R1 is cut off, so that the a contact r1 is opened and the subsequent current flow is cut off. Solenoid control valve V
2 to the neutral position and the pushing of the pushing plate 10 is stopped.

On the other hand, when carrying out the loading operation in a continuous cycle, if the selection switch SW2 is put into the interlocking position, even if the pushing operation by the pushing plate 10 is finished, the self-holding of the relay R1 will continue via the selection switch SW2. Then, the loading operation continues with the forward rotation of the rotary plate 11.

By the way, when the worker is located near the input port 8, he switches the safety switch SW11 and operates it, and when the rotary plate 11 rotates in a predetermined section A, the electric contact LS9 is closed, and when the operator closes the input port 8. When entering the detection range l near the mouth 8, the detector 21 is activated,
Since the electrical contact 21a is closed, current flows to the solenoid SOLM, switching the solenoid control valve V7 to the lower position. At this time, when the rotating plate 11 comes into contact with the operator and receives resistance, the low pressure relief valve 20 set to a low pressure is activated, and the pressure oil above the set pressure is returned to the oil reservoir T via the low pressure relief valve 20. be done.

As a result, the rotational force of the rotating plate 11 is reduced, and accidents can be minimized. Therefore, by turning on the safety switch SW11, the operator can position the rotary plate 11 near the turning point 8.
While rotating in the predetermined section A, if a foreign object is caught, the rotational force is automatically reduced. Further, the safety switch SW11 is normally closed, but if a large rotational force is required depending on the type or shape of the garbage, the switch SW11 may be released only at that time.

When the loading of garbage is completed in this manner, the vehicle travels to a processing plant and discharges the garbage in the garbage storage box 2, but this operation is well known in the art and will therefore be omitted.

(Effects of the Invention) As described above, in the present invention, a bypass circuit to an oil reservoir provided with an electromagnetic control valve and a pressure control valve is connected to the normal rotation side high pressure circuit of the hydraulic motor,
If an obstacle is detected within the detection range behind the input port when the rotary plate rotates in a predetermined range, the rotational force is reduced to the minimum necessary and the rotary plate is driven, so even if an operator comes into contact with the rotary plate, Accidents can be prevented to a minimum, and this will help improve the safety of this type of garbage collection vehicle.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention.
The figure is a schematic side view partially showing the rear part of the garbage collection vehicle, Figure 2 is a hydraulic circuit diagram, Figure 3 is an electric circuit diagram,
FIGS. 4 and 5 are layout diagrams of electrical contacts and switches. 3... Garbage storage box, 7... Garbage input box, 9...
Dust processing device, 10... Pushing plate, 11... Rotating plate, 12... Pushing cylinder, 13... Hydraulic motor, V1, V2, V3, V4... Solenoid control valve,
SW1~SW11...Switch, LS1~LS9...
Electrical contact, 21...detector.

Claims (1)

[Claims] 1. A garbage storage box mounted on the vehicle frame, which is connected to the rear opening of the garbage storage box so as to be tiltable, is equipped with a garbage processing device consisting of a rotary plate and a pushing plate, and is equipped with a garbage disposal device at the rear. In a garbage collection vehicle comprising a garbage input box having a mouth, a bypass circuit is connected to a normal rotation side high pressure circuit of a hydraulic motor that drives the rotary plate and communicates with an oil reservoir via an electromagnetic switching valve and a pressure control valve. and an electric contact that detects that the rotary plate is rotating in a predetermined range from above to below the input port, and an electric contact that is installed in the garbage input box to detect that the rotary plate is rotating within a predetermined range from the input port when rotating in the predetermined range. and a detector for detecting an obstacle in the rotary plate, and when the detector is operated, the electromagnetic switching valve is switched and the pressure control valve is operated to flow the pressure oil back to the oil reservoir and reduce the rotational force of the rotary plate. A safety control device for a garbage collection vehicle, characterized in that: