JPS6382202A - Safety controller for garbage wagon - Google Patents

Abstract

(57) [Abstract] 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 relates to a safety control device for a garbage collection vehicle.

(Prior art) Generally, a garbage input box equipped with a garbage processing device consisting of a push plate and a rotary plate is connected to the rear opening of the garbage storage box.
Insert garbage from the input port opening at the rear of the input box,
A garbage collection vehicle in which garbage is loaded into a storage box using the pushing plate and rotating plate is known.

In such a garbage collection vehicle, there is a problem in that a worker may be caught in the rotary plate when loading garbage, resulting in an accident resulting in injury or death.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and provides safety control for garbage collection vehicles to minimize accidents even if a worker is caught during work. It provides equipment.

(Technical means for solving the problem) The present invention provides a bypass circuit that communicates with an oil reservoir in the forward-turning high-pressure circuit for the hydraulic motor that drives the rotary plate, and also allows the rotary plate to rotate within a predetermined range. It is equipped with an electrical contact that detects when the worker is located, and a detector that detects that the worker is located within a certain range.
Furthermore, the bypass circuit is configured to include at least a pressure control valve.

(Function) When the operator operates the start switch after inputting garbage from the input port, the rotary plate starts rotating forward, and when the rotating plate rotates by a certain angle, the pushing plate moves backward at the same time. Even after the pushing plate reaches the retraction limit position and stops, the rotary plate continues to rotate forward, scooping up the garbage thrown into the bottom of the garbage disposal box, and when it rotates once and reaches the operation start position, the rotary plate continues to rotate. will be stopped. Thereafter, the pushing plate moves forward and the garbage on the rotary plate is pushed into the garbage storage box.

By the way, when a part of the worker's body comes into contact with the rotary plate and receives resistance while the rotary plate rotates across the input port, a pressure control valve set to a low pressure is activated.

Most of the pressure oil flows through the bypass circuit to the oil reservoir, bypassing 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 is generated below the set pressure of the pressure control valve, so it becomes extremely small compared to normal drive torque, and the This prevents major accidents such as parts of the machine being cut off by the rotating plate.

(Example) Embodiments 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 pushing plate 10 and a one-rotation plate 11,
It consists of a push cylinder 12, which is a hydraulic actuator for driving them, and a hydraulic motor 13 (see Fig. 2). It has the stroke necessary to open the input box 7.

That is, a stopper 4 is fixed to the inner wall of the garbage input box 7, and the upper part of the push plate 10 is in contact with the stopper 14, and by further contracting the push cylinder 12, the garbage input box 7 is tilted. It is something.

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 cylinder 16 which is pivotally supported at the bottom of the garbage storage box 3, and is normally secured. A lashing air 16 is engaged with a U port 17 fixed to the front surface of the garbage input box 7 through a cylinder 15, and the garbage input box 7 is secured to the garbage storage box 3.

Further, a detector 21 is disposed at the bottom of the garbage input box 7, and is used to detect when a worker or the like is located within a certain range l from the input port 8. It consists of

Next, the hydraulic circuit will be explained with reference to FIG.

P is a hydraulic pump, T is an oil reservoir, ■1 is an electromagnetic control valve that controls the dump cylinder 4, ■2 is an electromagnetic control valve that controls the push cylinders 12 for swinging the push plate 10 and for tilting the garbage input box 7, V3 is an electromagnetic control valve for controlling the hydraulic motor 13 for rotationally driving the rotary plate 11, and these electromagnetic control valves V1, V2, V3 are arranged in series with the discharge pipe of the hydraulic pump P. In addition, each electromagnetic control valve Vl, V2. V
3 has spool operating solenoids 5OLC and 5OLD.
, 5OLE, 5OLF, 5OLG, and 5QLH. V4 is an electromagnetic control valve that controls the lashing cylinder 15, and the spool operating solenoids 5OLA and 5
OLJ, and the electromagnetic control valves V1, V2. It is arranged in parallel with V3.

Also, V5. V6 is a solenoid valve that controls the extension of the push cylinder 12, and is disposed close to the push cylinder 12 in a circuit communicating with the rod-side oil chamber of the push cylinder 12, and includes a spool operating solenoid SOLK.

It has 5OLL.

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 there is an electromagnetic switching valve v7 and a pressure control valve downstream thereof. A low pressure relief valve 20 is arranged in series. The electromagnetic valve (7) has a spool operating solenoid SQLM.

Next, the electric circuit will be explained with reference to FIGS. 3, 4, and 5. B is a power source such as a battery, BZl and BZ2 are buzzers, SWI is a changeover switch to select between planting work and discharge work, and SW2 is a single-acting (once) or interlocking (single-action) operation for garbage loading work.

SW3 is the activation switch for loading work, SW4 is the stop switch for loading work provided on the left and right sides of the garbage disposal box 7, SW5 is the contact switch for the buzzer BZI, and SW6 is A reversing switch that independently operates the rotary plate 11 in reverse, SW7 is a push switch that independently operates the push plate 10 in reverse, SW8 is a reversal switch that independently operates the push plate 10 in reverse, and SW9 opens and closes the garbage input box 7. The open/close switch 5WIO is a safety switch that selects whether to operate the dump switch 5WII by tilting the garbage storage box 2 (depending on whether or not to operate the pressure control valve).

Next, LSI is an electrical contact that operates at the forward limit position of the pushing plate 10, LS2 is an electrical contact that operates at the backward limit position of the pushing plate 10, and LS3 is an electrical contact that operates when the rotating plate 11 corrects a predetermined angle from its scraping stop position. An electrical contact that operates continuously while rotating (clockwise in the drawing), LS4 is the garbage storage box 3
LS5 is an electric contact that operates when the garbage input box 7 is tilted at a predetermined angle. LS6 is an electric contact that operates when the garbage input box 7 slightly opens with respect to the garbage storage box 3. , LS7 is an electrical contact that is activated when a power take-off unit (PTO) (not shown) is operated, L
S8 is an electric contact that operates when the lashing wind 16 is in the lashing state, LS9 is an electric contact that operates to open when the rotary plate 11 is rotating in a predetermined section from the upper part to the lower part of the input port 8, and 21a is an electrical contact that is activated when the detector 21 detects a worker.

R1, R2, R3, R4, R5, R6, R7 are relays, and contacts rl, r2. r3. r4. r5. It is equipped with r6 and r7. The above-mentioned switch group includes a selection switch SW2, an operation switch SW3, and one stop switch SW.
4, Communication switch SW 5° Reverse switch SW6,
The push switch SW7 and the reversing switch SW8 are arranged on the left side near the garbage inlet 8 of the garbage inlet box 7, and the other stop switch SW4 and the safety switch 5WII are respectively arranged on the right side near the garbage inlet 8. switch SW
I.

Open/close switch SW9 and dump switch swi.

is located inside the driver's seat.

Next, to explain the operation of the present invention, in the push-in completed state shown in FIG.
In the figure, it has been switched to the lower position. After switching the selector switch SWI to the upper position from this state, if the implantation work is to be performed in one cycle, the selection switch SW2 is turned to the single-acting position. In this case, safety switch, (-3WI
11-) Assume that it is in the @rei position.

Then, when the garbage is dumped from the input port 8 of the garbage input box 7 and the activation switch SW3 is turned on, the current flows through the relay R1.
relay R via its a contact rl and b contact r4.
1 is self-retained. It also flows to the relay R5 via the electrical contact LSI, and passes through the ai point r5 to the solenoid 5O.
Power on LG.

At this time, since the electrical contact LS3 is switched downward, a
Relay R5 is self-held via contact r5. As a result, the solenoid control valve v3 is switched to the left position, and the hydraulic motor 1
3 is activated and the rotary plate 11 starts normal rotation.

When this rotary plate 11 rotates through a predetermined angle, electrical contact LS3
returns upwards, the current flows through the electrical contacts LS3. The current flows to relay R3 via the B contact r4, and the A contact r3. It flows through electrical contact LS2 to relay R2.

Therefore, the current flows through the solenoid 5O through the a contact r3.
At the same time as the flow to LG continues the normal rotation of the one-rotation plate 11, a
Solenoid S via contact r2.

LF, the solenoid control valve v2 is switched to the left position, the pushing cylinder 12 is contracted, and the pushing plate 10 is retreated (reversed).

At this time, since the electric contact LSI is switched upward by reversing the push plate 10, the current supply to the relay R5 is cut off together with the upward switching of the electric contact LS3.

Then, when the push plate 10 reaches the retraction limit position, the electric contact LS2 is switched to cut off the current to the relay R2, so that the a contact r2 is opened and the excitation to the solenoid 5OLF is cut off.

As a result, the electromagnetic control valve v2 returns to the neutral position and stops the reversal of the pusher plate IO.

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. Switch electrical contact LS3 downward.

As a result, the power to the relay R3 is cut off, so the electromagnetic control valve v3 returns to the neutral position, and the forward rotation of the rotary plate 11 is stopped. At the same time, electrical contacts LSt, LS3. The flow flows to relay R4 via B contact r5, and self-holds relay R4 via its A contact r4, and solenoid 5
Flows to OLE, 5QLK and 5OLL, and electromagnetic control valve v
2 in the right position, and solenoid valve V5. Switch V6 to the lower position. Therefore, the pushing cylinder 12
is extended 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 LSI 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. The electromagnetic control valve (2) is returned to the neutral position and the pushing of the pushing plate 10 is stopped.

On the other hand, if the loading operation is performed in a continuous cycle, if the selection switch SW2 is set to 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, the safety switch SWI1 is switched and operated, and when the rotary plate 11 rotates in a predetermined section A, the electric contact LS9 is closed, and the worker Since the detector 21 located near the input port 8 is activated and its electric contact 21a is closed, current flows to the solenoid SOLM and switches the electromagnetic switching valve v7 to the lower position. At this time, if the rotating plate 11 comes into contact with the worker and receives resistance, the low pressure relief valve 2 is set to low pressure.
0 is activated, and the pressure oil above the set pressure is returned to the oil reservoir T via the low pressure relief valve 20.

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 5W11, when a foreign object is caught while the rotary plate 11 rotates in the predetermined section A while the operator is located near the input 8, the rotational force is automatically turned off. reduce Further, the safety switch 5WII is normally closed, but if a large rotational force is required due to the nature or shape of the garbage, the switch 5WII 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.

Note that in this embodiment, the pressure is controlled using an electromagnetic switching valve and a low pressure relief valve to reduce the rotational force of the rotating plate. Pressure reduction control may be performed using an adjustable electromagnetic proportional relief valve.

(Effects of the Invention) As described above, in the present invention, a bypass circuit to an oil reservoir provided with a pressure control valve is connected to the normal rotation side high pressure circuit of the hydraulic motor, and the rotary plate rotates in a predetermined section. In addition, if a worker is located near the input port and a foreign object is caught in the rotating plate, the rotating force will be reduced to the minimum necessary and the rotating plate will be driven. This also helps to minimize accidents and improves the safety of this type of garbage collection vehicle.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a schematic side view partially showing the rear part of a garbage collection vehicle, FIG. 2 is a hydraulic circuit diagram, FIG. 3 is an electric circuit diagram, and FIG. 5 and 5 are layout diagrams of electrical contacts and each switch. 3. War/garbage storage box, 7φ/φ garbage input box, 9. Umbrella/garbage processing device, 1011.. Pushing plate, 11.. Rotating plate,
12... Push cylinder, 13... Hydraulic motor, Vl
, V2. V3. V4---Solenoid control valve, SWI~5WI
I-・Φ switch, LS1 to LS9・Electric contact, 2
1...Detector.

Claims (1)

[Claims] A garbage storage box mounted on the vehicle frame is connected to the rear opening of the garbage storage box so as to be tiltable, and is equipped with a garbage processing device consisting of a rotary plate and a pushing plate, and a garbage inlet at the rear. In the garbage collection vehicle, the garbage collection vehicle is comprised of a garbage input box formed with a rotary plate, and a bypass circuit that is branched from a normal rotation side high pressure circuit to a hydraulic motor that drives the rotary plate, is provided with at least a pressure control valve, and communicates with an oil reservoir. , an electric contact that detects when the rotary plate rotates in a predetermined section formed from the upper part to the lower part of the input port, and an electric contact that is arranged in the garbage input box so that a worker or the like is located within a certain range from the input port. The pressure control valve is configured to operate when the electric contact and the detector are activated and a foreign object is engulfed by the rotating plate, thereby reducing the rotational force of the rotating plate. Safety control device for garbage collection vehicles.