JPS63306101A - Hydraulic control device for dust collecting vehicle - Google Patents

Abstract

PURPOSE:To make parts interchangeable by forming bypass ports in a solenoid control valve for controlling a fastening cylinder at change-over positions and in an electromagnetic control valve for controlling a hydraulic actuator at a neutral position, respectively, so that pressure oil may be fed, downstream thereof. CONSTITUTION:An electromagnetic control valve V4 for controlling an elevating cylinder 14 and a fastening cylinder 15 is formed therein with bypass ports at change-over positions so that pressure oil may be fed, downstream thereof. This electromagnetic control valve V4 is connected to a discharge pipe from a hydraulic pump P in parallel with an electromagnetic control valve V1 for controlling a dump cylinder 4, an electromagnetic control valve for controlling a push-in cylinder 12 and an electromagnetic control valve V3 for controlling a hydraulic motor 13. With this arrangement, since pressure oil may be fed downstream of the electromagnetic control valve V4 even after the latter is operated, it is possible to enhance the workability and to make parts interchangeable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic control device for a garbage collection vehicle.

(Prior art) Conventionally, a garbage input box equipped with a garbage processing device is tiltably connected to the rear opening of the garbage storage box, and the strong garbage input box is secured to the garbage storage box via a lashing cylinder. A garbage collection vehicle in which the operation of the garbage processing device is controlled by an electro-hydraulic control device is also known.

(Problems to be Solved by the Present Invention) In such garbage collection vehicles, the structure of the control valve that controls the hydraulic actuator of the garbage processing device differs greatly depending on the manufacturer, so the circuit configuration must be adapted to each manufacturer. There was a need.

The present invention has been made in view of these points, and provides a garbage collection vehicle that is advantageous in terms of maintenance management by providing a new hydraulic control circuit that is compatible even if the control valves controlling the garbage processing device are different. It is something to do.

(Four steps to solve the problem) A garbage input box equipped with a garbage processing device inside is connected to the rear of the garbage storage box mounted on a heavy object so as to be tiltable, and the garbage input box is installed on a heavy object. In the garbage collection 111, the box is configured to engage with the garbage storage box by a lashing cylinder, and the operation of a plurality of hydraulic actuators for driving the garbage processing device is controlled via an electro-hydraulic control device, wherein the lashing cylinder and a second electromagnetic control valve disposed downstream of the first electromagnetic control valve and controlling one of the hydraulic actuators described in (iii) above. The valve has a
In addition, the second electromagnetic control valve is formed with a bypass port capable of supplying pressure oil to the downstream side thereof at the neutral position,
Furthermore, the first electromagnetic control valve and the second electromagnetic control valve are connected in parallel to the discharge pipe of the hydraulic pump,
The second electromagnetic control valve is configured to be able to supply pressure oil to its downstream side via the bypass port at 1E.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.
1 is a garbage collection vehicle, and a garbage storage box 3 is placed on the vehicle body 2, and the garbage storage box 3 is pivotally supported by a dump cylinder 4 installed between the IV body 2 and the garbage storage box 3. It can be freely tilted around 5 parts.

A garbage input box 7 is connected to the rear opening 3a of the garbage storage box 3, and the garbage input box 7 is pivotally mounted 6 at one end thereof. box 7
In addition to being able to open and close the container installed between the lower cylinder 14 as needed around the pivot 6, the inlet 8 is opened at the rear of the inlet, and a garbage disposal device 9 is installed inside. Equipped.

The garbage processing device 9 includes a pushing plate 10, a rotating plate 11,
It consists of a push cylinder 12, which is a hydraulic actuator for driving them, and a hydraulic motor I3 (see Fig. 2), and as is well known in the art, the garbage input box 7 is stored by the cooperative action of the push plate 10 and the rotary plate 11. The garbage dumped in m18 is loaded into garbage storage box 3.

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 mold 16 which is pivotally supported at the bottom of the garbage storage box 3, and is normally secured. The securing die 16 is engaged with a U-bolt 17 fixed to the T tin surface of the garbage input box via the cylinder 15, and the garbage input box 7 is secured to the garbage storage box 3.

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 a push cylinder 1
2 is an electromagnetic control valve that controls the hydraulic motor 13, v4 is an electromagnetic control valve that controls the lifting cylinder 14 and the lashing cylinder 15, and the lashing cylinder 15 is connected to the loading box. 7 is connected to the side where the lowering cylinder 14 becomes high pressure when tilting, and these electromagnetic control valves Vl, V2. V3. V4 is the spool operation solenoid 5OLc, 5OLd, 5OLe, 5QLf, SOL
It is equipped with gSOLh, 5OLa, and 5OLj.

The electromagnetic control valves Vl, V2. V3. V4 is arranged in parallel to the discharge pipe of the hydraulic pump P, and the solenoid control valve 1 is arranged in series with the solenoid control valve 2, and furthermore, the solenoid control valve V4 has pressure on its downstream side at each switching position. It forms a bypass port that can supply oil.

V5. V6 is an electromagnetic on-off valve that is normally energized to a position that causes the elevating cylinder 14 to contract and allows the elevating cylinder 14 to extend.
, I.

Next, the electric circuit will be explained with reference to FIGS. 3 and 4.

B is a power source such as a battery, BZl, B2', 2 is a buzzer, SWI is a selection switch for selecting implantation work or discharge work, SW2 is a stop switch for implantation work provided in the input lotion pull, SW3 is the start switch for loading work,
SW4.3WI 1 is a stop switch placed on the left and right sides of the input port 8 of the garbage input box 7 during implantation work, SW5 is a contact switch for the buzzer BZI, SW6 is a reverse switch that independently operates the rotary plate II in reverse, SW7 is a push switch that pushes the push plate 10 independently, SW8 is a drawing switch that starts the garbage processing device 9 when discharging garbage, SW9 is a stop switch that stops the operation of the garbage processing device 9 by the drawing switch SW8, and swto is a A dump switch that tilts and operates the garbage storage box 2, 5W11 is the garbage input box 7
Open/close switch that opens and closes, 5W12.3W13 is a safety switch that disables evacuation from the driver's seat, 5W
I4 is a reversing switch that independently reverses the push plate 10.

Among these switch groups, the stop switch SW2 is provided in the closing rotary pull, the start switch SW3, the stop switch SW4.3WI1. Communication switch SW5, reverse switch SW6, push switch SW7 and reverse switch S
W l 4 is arranged near the garbage inlet 8, and includes a selection switch SWt, an open/close switch 5WI1 . Dump switch sw+o, I output switch SW8 and stop switch SW9
is located inside the driver's seat, and the safety switch 5WI2.3W1
3 is provided at the rear of the garbage storage box 3.

Next, LSI is a set of air contacts that operate at the forward limit position of the pushing plate 10, [4S2 is an electrical contact that operates at the backward limit position of the pushing plate 10, and LS3a and LS3b are the electrical contacts that operate when the rotating plate 11 is at its scraping-L stop upper position. an electrical contact that continuously operates while rotating a predetermined angle from
LS4 is an electric contact that operates when the garbage storage box 3 is in the traveling position, LS5 is an electric contact that operates when the garbage input box 7 is tilted at the foot angle, and LS6 is an electric contact that operates when the garbage input box 7 is opened. , LS7 is an electrical contact that operates when a power take-off device (not shown) is connected, L S 8LS
Reference numeral 9 denotes an electrical contact that is activated when a safety rod (not shown) is set in a working position.

R1, R2, R3, R4, R5, R6, R7゜R8, R
9 is a relay with contacts r1. r2. r3゜r4. r5. r
6. r7. r8. It is equipped with r9.

Further, regarding the electrical contacts LS3a and LS3b for detecting the scraping stop device for the rotary plate 11 described above, the electrical contact LS3b is arranged so as to be connected and disconnected slightly earlier than the electrical contact LS3a by a cam.

Next, to explain the operation, in the push-in end-r state shown in FIG.
b) has been switched to the lower position in FIG.

First, when a power take-off device (not shown) is operated, electric contact LS7 is closed and relay R7 is energized.

The energization of relay 1 and 7 keeps the subsequent circuit energized via its a contact r7.

Here, after switching the selection switch SWI to the upper position, dumping the garbage into the garbage disposal box 7 [ ] 8 and pressing the starting switch SW3, current flows to the relay R1, and its a contacts r1, b Relay 1 (1 is self-held) via contact 4 and b contact r6.

It also flows to relay R5 via the electrical contact Sl.
The solenoid SOLg is energized through the a contact r5.

At this time, since the electrical contact LS3a has been switched downward, the relay R5 is self-held via the a contact r5.

As a result, the electromagnetic control valve (3) is switched to the upper position, the hydraulic motor 13 is operated, and the rotary plate 11 starts rotating normally.

When this rotary plate 11 rotates through a predetermined angle, electrical contact LS3
Since a returns upward, the current flows through electrical contacts LS3a, b
It flows to relay R3 via contact r4, and flows to relay R2 via electrical contact LS2.

Therefore, the solenoid s via the a contact r3.

Lg to maintain normal rotation of rotary plate II, and at the same time, it flows to solenoid 5OLf via a contact r2, switches electromagnetic control valve 2 to the lower position, causes the push cylinder 12 to contract, and the push plate 10 Activate backward (reverse).

At this time, the electric contact [, S
Since l switches to -1, the electrical contact 14S3
Along with the upward switching of a, the power supply to relay R5 is cut off.

Then, when the push plate 10 reaches the retraction limit position, the electric contact LS2 is switched to cut off the power to the relay R2,
The a contact r2 is opened, and the excitation of the solenoid 5OLf is cut off.

Therefore, the electromagnetic control valve (2) returns to the neutral position and stops the reversing operation of the push plate 10.

However, since the relay R3 continues to be energized, the forward rotation of the rotary plate 11 continues, and the garbage dumped in the storage section 18 of the garbage input box 7 is scraped away.
When the scraping stop position is reached after one rotation, the electric contact LS3a is switched downward.

As a result, the relay R3 is de-energized, so the electromagnetic control valve (3) returns to the neutral position, and the normal rotation of the rotary plate 11 is stopped.

At the same time, the current flows to relay R4 via electrical contacts LSI, LS3a, and b contact r5, and self-holds relay R4 via its a contact r4, and flows to solenoid 5OLe, switching electromagnetic control valve V2 to the upper position.

For this reason, the pushing cylinder 12 operates smoothly, and the pushing plate 1
0 operates forward (pushing) to push the garbage on the rotary plate 11 into the garbage storage box 3.

After that, 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, which opens the a contact RL and cuts off the subsequent current flow. The electromagnetic control valve V2 is returned to the neutral position to stop the pushing operation of the pushing plate IO. Here, one cycle of dust planting by the dust treatment device 9 is completed.

After loading the garbage into the garbage storage box 3 as described above, the vehicle travels to a designated treatment site and discharges the garbage.

For this discharge, first, the selection switch SWI is turned to the lower position, and the open/close switch 5WII is turned to the upper position.

As a result, the current flows to the buzzer BZ2 and issues one signal, and also directly to the solenoid 5OLa and the reversing switch 5W.
14, Flows to solenoid 5OLf via b contact ``2,
The solenoid control valve (2) is switched to the lower position, and the solenoid control valve (4) is switched to the upper position.

In this case, the push cylinder +2, which has a light load, contracts first.
A small movement is made, and the pushing plate 10 retreats.

When the pushing cylinder 12 is fully compressed and the pushing plate lO reaches the retraction limit position, the lashing cylinder 15 with a light load is then extended, and the lashing 16 rotates clockwise to tighten the U bolt 1.
Withdrawal from 7. Therefore, the binding of the garbage input box 7 to the garbage storage box 3 is released.

When the lashing cylinder 15 is fully extended, the pressure oil flows through the electromagnetic on-off valve V5.
．． The oil is supplied to the piston back pressure side oil chamber of the lifting cylinder 4 through V6, and as a result, the lifting cylinder 4 is extended.
The garbage input box 7 is opened to the garbage storage box 3 centering on the part.

Then, when the garbage input box 7 opens at a certain angle, the electrical contact L
Since S5 is switched, after this dump switch 5WIO
When the solenoid 5OLc is switched to the upper position, a current flows through the solenoid 5OLc, the electromagnetic control valve V1 is switched to the upper position, the dump cylinder 4 is extended, the garbage storage box 2 is tilted, and the garbage is discharged.

When the dump switch 5WlO is switched to the downward position after the discharge of the garbage is completed, the solenoid 5QLd is energized and the electromagnetic control valve 1 is switched to the downward position, so that the dump cylinder 4 is reduced and the garbage storage box 3 is moved. Make it lie down.

When the garbage storage box 3 returns to the running position, the electrical contact [, S4
is switched. And after that, open/close switch 5W
When II is switched to the lower position, current flows to buzzer BZ2 and sounds as described above, and at the same time directly solenoid 5OLk, SQL! and the electromagnetic on-off valve V5. V6
is switched to the lower position (in this case, the garbage input box 7 is tilted, and relay R8 is switched by opening electric contact LS6).
is excited. Therefore, the b contact r8 is open, and energization to the solenoid 5OLj is blocked).

As a result, the piston back pressure side oil chamber of the elevating cylinder 14 is operated by the electromagnetic on-off valve V5. V6 is connected to the oil reservoir T via the solenoid control valve ■4 located at the center position, so the lift cylinder 1
4 is reduced by the zero width of the garbage input box 7, and the garbage input box 7
will be closed.

In this case, the pressure oil from the hydraulic pump P is sent to the lifting cylinder 14.
The oil returns to the oil reservoir T via the electromagnetic control valves V2 to 4 without acting on the oil.

When the garbage input box 7 reaches the connected state with the garbage storage box 3, the electric contact L S 6 is opened and the excitation of the relay R8 is cut off. Then, the b contact r8 selection switch SW
1. Since the solenoid S Of j is energized through the a contact ``1'' and the solenoid 5OLd is energized through the b contact r8 and the diode to switch the electromagnetic control valves Vl and V4 to the lower position, the pressure oil from the hydraulic pump P is Piston back pressure side oil chamber of lashing cylinder 15 and dump cylinder 4
It communicates with the piston side oil chamber.

At that time, the dump cylinder 4 has already completely collapsed with the garbage storage box 3 laid down, so the pressure oil discharged by the dump cylinder 4 contracts the lashing cylinder 15 and connects the lashing mold 16. U bolt 17 of garbage input box 7 in condition
to engage.

In this way, once the vehicle returns to the running state, it is possible to start the garbage collection work again.

By the way, the above-mentioned garbage processing device is not limited to only a push plate and a rotary plate, but may be a push plate type with a single plate, and the garbage in the garbage storage box can be discharged only by a method in which the garbage storage box is tilted by a dump cylinder. / Ejection plate "rear" sliding 51 甜6/TXfbJ:tz.

(Effects of the Invention) As described above, in the present invention, the first electromagnetic control valve that controls the lashing cylinder is made into a bypass port that can be supplied downstream at each switching position, and furthermore, the first rear stage By forming a bypass boat with the second solenoid control valve located at the center position, and connecting the first and second solenoid control valves in parallel, the downstream side is maintained even after the first solenoid control valve is operated. By using the hydraulic control position of the present invention in place of the conventional series circuit, the interchangeability of parts is improved and maintenance management is improved. This will be advantageous and can be expected to improve in terms of service.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and Fig. 1 is a side view of the rear part of the garbage collection type, Fig. 2 is a hydraulic circuit diagram, and Fig. 3 (
a) (b) are electrical circuit diagrams, and FIG. 4 is a layout diagram of electrical contacts and each switch. 3... Garbage storage box, 7... Garbage input box, 9... Garbage processing device, 10... Pushing plate, li... Rotating plate, 1
2... Push cylinder % 13... Hydraulic motor, 14
... Lifting cylinder, Vl. V2. V3. V4... Solenoid control valve, 15... Locking cylinder.

Claims (1)

[Claims] A garbage input box equipped with a garbage processing device inside is connected to the rear opening of the garbage storage box mounted on the vehicle body in a freely tiltable manner.
In the garbage collection vehicle, the garbage collection vehicle is configured such that the garbage input box is engaged with the garbage storage box by a lashing cylinder, and the operation of a plurality of hydraulic actuators for driving the garbage processing device is controlled via an electro-hydraulic control device. At least a first electromagnetic control valve that controls the lashing cylinder and a second electromagnetic control valve that is arranged after the first electromagnetic control valve and controls one of the hydraulic actuators are provided, and the first electromagnetic control valve A bypass port capable of supplying pressure oil to the downstream side of the electromagnetic control valve at each switching position and the second electromagnetic control valve at the intermediate position is formed, and furthermore, the first electromagnetic control valve and the second electromagnetic control valve A second electromagnetic control valve is connected in parallel to the discharge pipe of the hydraulic pump, so that pressure oil can be supplied to the downstream side of the second electromagnetic control valve via the bypass port when the second electromagnetic control valve is in the middle. A hydraulic control device for a garbage collection vehicle, characterized in that it is configured as follows.