JP2003072903A - Garbage pushing controller for garbage collection vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage pushing controller for garbage collection vehicle that enables the operation of pushing garbage to be performed smoothly consistently. SOLUTION: A garbage pushing device is disposed in a garbage dumping box and a discharge plate in the garbage dumping box is provided to move axially by a discharge cylinder 18. An oil-hydraulic circuit of the discharge cylinder includes high pressure relief valves RV2, RV3, a fourth switch valve V4 and a fifth switch valve V5. The high pressure relief valves RV2 and RV3 have different values of resistance. The fourth switch valve V4 switches a back pressure oil chamber of the discharge cylinder between in the communicating position and in the blocked position against the high pressure relief valve RV3. The fifth switch valve V5 controls the fourth switch valve to switch to the communicating position so that the back pressure oil chamber of the discharge cylinder is communicating with an oil reservoir via one of the high pressure relief valves when the oil pressure of the discharge cylinder is higher than that of a push cylinder. On the other hand, the fifth switch valve V5 controls the fourth switch valve V4 to switch to the blocked position when the oil pressure of the discharge cylinder is lower than that of the push cylinder, and controls the back pressure oil chamber of the discharge cylinder to communicate with the oil reservoir only for a quick moment when the oil pressure of the push cylinder reaches the predetermined value or more.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
In particular, dust that moves the discharge plate forward
Ensure that the garbage pushing operation can be performed consistently and smoothly
About measures. 2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Publication No. 2, a garbage storage box is mounted on the vehicle body.
Trash box that communicates with the garbage storage box via the trash can
And was inserted into the garbage input box from the garbage input port.
Put the trash in the trash storage space of the trash storage box through the trash filling port
While providing a dust pushing device, the dust
The garbage accommodating space into which garbage is pushed
Provide a discharge plate that is movable in the axle direction that is partitioned into space and
The discharge plate is moved in the axle direction by a multi-stage discharge cylinder
To increase or decrease the volume of the garbage storage space
Configured garbage trucks are known. [0003] Such a garbage collection vehicle has a trash press.
Control device is provided.
The back of the discharge cylinder when pushing dust into the dust box
While maintaining the pressure side oil chamber at high pressure at all times,
Pressure applied to the dust pushing device reaches a certain value or more
Oil reservoir for a certain period of time
Switch the electromagnetic switching valve so that it communicates with the
Automatically moves to the back (in front of the car body) in response to dust
By moving the garbage storage space,
While compressing garbage, into the garbage storage space through the garbage filling port
They are to be accommodated. [0004] However, the above conventional art
In the garbage collection control device of the garbage truck, the garbage storage box
Each stage of the discharge cylinder is stepped
Although the contraction operation is performed, the final contraction stage of the discharge cylinder is performed.
Then, the contraction operation may not be performed smoothly. This
This is because the hydraulic pressure in the back pressure side oil chamber of the discharge cylinder is
Because it is lower than the oil pressure in the back pressure side oil chamber.
Therefore, the contraction operation at the final contraction stage of the discharge cylinder is smooth.
Movement of dust that moves the discharge plate forward without being performed
The work cannot be done smoothly all the time.
You. [0005] The present invention has been made in view of the above points.
The purpose is to push the trash
Garbage from a garbage truck that can be performed smoothly and consistently from start to finish
It is to provide a push control device. [0006] To achieve the above object,
The solution taken by the present invention is
It is mounted on the vehicle body as a control device, and a garbage
A dust storage box having a
A dust input box that is connected in a tiltable manner and the dust input box
Equipped inside, the dust can be removed through the dust
A dust pushing device that pushes the dust into the trash container,
The garbage storage box is movably installed in the front and is
The garbage between which the garbage is pushed by the garbage pushing device
A discharge plate partitioned into a storage space and a space in front of the discharge space;
Move the platen forward when contracting to reduce the volume of the garbage storage space.
The discharge cylinder to be changed and the hydraulic pressure of the discharge cylinder
Oil reservoir on the back pressure side of the discharge cylinder
To each other via individual resistors
High resistance means and low resistance means having different
Position and cutoff of the oil pressure chamber on the back pressure side of the cylinder
And a solenoid-operated switching valve for switching to a position
The hydraulic pressure of the oil chamber on the back pressure side of the discharge cylinder
Is higher than the pressure acting on the dust pushing device.
High resistance means for the back pressure side oil chamber of the cylinder against the oil reservoir
Or turn the electromagnetic switch off so that it communicates through low resistance means.
While switching the change valve, the oil in the back pressure side oil chamber of the discharge cylinder
Above when the pressure is lower than the pressure acting on the dust pusher
Switching the electromagnetic switching valve to the shut-off position for the low resistance means
Together with the pressure acting on the dust pushing device reaches a predetermined value or more.
The oil chamber on the back pressure side of the discharge cylinder
Switching control means for controlling communication with the reservoir
And a step. [0007] According to this specific matter, such as garbage and cardboard
If you push any regular trash into the trash bin,
The oil pressure in the back pressure side oil chamber at the initial stage of
If the pressure is higher than the pressure acting on
High resistance means for the back pressure side oil chamber of the cylinder against the oil reservoir
The solenoid-operated directional control valve is connected to the low-resistance means so that
Switch to the shutoff position, where the discharge plate
Automatically moves to the back (front of the vehicle) in response to the pushing
The volume of the garbage storage space has been expanded,
Normal garbage is compressed while the garbage is collected through the garbage port.
It is housed in a storage space. In addition, hard dust such as wooden products is stored in a dust storage box.
To the back pressure side in the initial contraction of the discharge cylinder.
The oil pressure in the oil chamber is higher than the pressure acting on the dust pushing device.
Oil in the back pressure side oil chamber of the discharge cylinder
So that it communicates with the reservoir via low resistance means.
By switching the magnetic switching valve to the communication position, the discharge plate
Automatically moves to the back in response to the hard dust
The volume of the storage space is expanded, and the hard garbage is compressed.
It is stored in the refuse storage space via the refuse filling port. others
Trash when pushing hard trash such as wood products
The pushing device (the pushing plate) is reliably prevented from being damaged. On the other hand, ordinary dust such as garbage and cardboard
Push hard garbage such as garbage and wood products into the garbage storage box
Oil in the back pressure side oil chamber at the end of contraction of the discharge cylinder.
The pressure is lower than the pressure acting on the dust pusher
In this state, the back pressure side oil chamber of the discharge cylinder is
Switch solenoid valve to shut-off position to shut off
At the same time, the pressure acting on the dust
When the pressure reaches, the back pressure side oil chamber of the discharge cylinder is
By controlling to communicate with the il reservoir,
The discharge plate automatically moves to the back in response to the dust
The capacity of the garbage storage space has been expanded,
Hard garbage such as ordinary garbage and wood products is compressed
It is stored in the refuse storage space via the refuse filling port. Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. In FIG. 1, on the body of a refuse collection vehicle,
A garbage filling port 3 for packing garbage is opened at the rear side of the vehicle body.
Garbage storage box 1
The dust input box 2 is tilted by the pivot 4 at the upper end of the dust filling port 3.
It is movably connected. The dust input box 2 is open at the front of the vehicle body.
And is communicated with the garbage filling port 3 of the garbage storage box 1
In the lower part of the back, an opening 5 for introducing garbage is opened.
A garbage storage room 6 is formed in the lower part of the
In the receiving box 2, the trash is compressed and crushed, and the trash
A dust pushing device A for pushing the inside is provided. The dust pushing device A is provided with both dust input boxes 2.
It is laid along the side wall and slopes toward the lower rear of the vehicle.
And a guide groove member 7 made of a grooved steel.
The pivot 4 is pivotally supported at the upper end of the member 7. on the other hand,
In the garbage input box 2, the lifting and lowering formed over the entire width
The plate 8 is accommodated, and above and below the elevating plate 8,
A guide rotatably fitted along the inner wall of the guide groove member 7
The roller 9 is mounted on the shaft (a portion indicated by a broken line in the figure). Ma
The upper part of the back of the lifting plate 8 is pivoted through a bracket.
The pivot 16 is supported by the guide groove member.
7 along the back surface and matches the sliding distance of the lift plate 8
Over the notch 10 formed in the side wall of the garbage input box 2
So that it protrudes outside from the inside of the garbage bin 2
I have. [0014] Then, as shown by the broken line in the figure, the projection protrudes outward.
Between the pivot 16 and the lower outside of the waste bin 2, there is a pair.
Of the lifting cylinder 11 along the inclination direction of the guide groove member 7
Provided by the expansion and contraction operation of the lift cylinder 11.
Reciprocates the elevating plate 8 along the guide groove member 7.
It has been done. At the lower end of the elevating plate 8, dust is introduced.
The push plate 12 extending over the entire width direction of the box 2 is
The push plate 12 is pivotally supported by the
The protruding support piece 14 and the pivot of the end of the elevating cylinder 11
A pair of pushing cylinders 15 are connected between the pushing cylinders 15 and 16.
The pushing plate 12 is moved by the expansion and contraction operation of the pushing cylinder 15.
To swing back and forth around its pivot 13.
Have been. The refuse storage box 1 covers the entire cross section thereof.
Garbage pushing device by the discharge plate 17 provided
The garbage pushed from A through the garbage filling port 3 is stored.
The garbage storage space 1a and the back space 1 in the back (in front of the vehicle body)
b, and the lower part of the inner space 1b is
Discharge cylinder 1 for moving delivery plate 17 in the axle direction
8 are provided. The discharge cylinder 18 includes a base 18
a and the first piston 1 which is telescopic with respect to the base 18a.
8b and a second piston that is extendable and retractable with respect to the first piston 18b.
The piston 18c and the second piston 18c extend and contract
A three-stage cylinder consisting of a freely movable third piston 18d
is there. The base end of the base 18a is located below the discharge plate 17.
Is rotatably supported by a support member 21 provided on one side.
The tip of the third piston 18d is located at the end of the back space 1b.
It is pivotally supported by a shaft member 22 attached to the back.
When the discharge cylinder 18 is extended.
The exit plate 17 is brought close to the refuse packing port 3 of the refuse storage box 1,
While minimizing the volume of the garbage storage space 1a,
When the damper 18 is retracted, the volume of the garbage storage space 1a is reduced.
Has been made to increase. Next, the cylinders 11, 15, 18
The hydraulic circuit will be described. FIG. 2 shows a piping system of a hydraulic circuit, where P is oil
Pressure pump, T is oil reservoir, V1 is the elevating cylinder
The first switching valve for operating the dampers 11, 11, V2 is
Second switching for operating the pushing cylinders 15, 15
The valve V3 is a third opening for operating the discharge cylinder 18.
The first switching valve V1 is connected to a solenoid SOL.
c, SOLd, and the second switching valve V2 is a solenoid SOL.
e, SOLf, and the third switching valve V3 is a solenoid SOL.
g and SOLh. And the first
And the second switching valves V1 and V2 are directly connected to the hydraulic pump P.
And the second and third switching valves V2 and V3 are hydraulically connected.
It is connected in parallel with the pump P. Further, PS is a piston of the pushing cylinder 15.
Pressure switch connected to the circuit communicating with the back pressure side oil chamber
H, RV1 is in the piston back pressure side oil chamber of the pushing cylinder 15.
When the working oil reaches a certain pressure or higher, the oil is
The high pressure relief valve that opens to reservoir T, RV2 is a discharge
The pressure acting on the piston back pressure side oil chamber of the cylinder 18 is predetermined
When the pressure reaches or exceeds (for example, 17.9 hPa or more),
As a high resistance means for releasing the pressurized oil to the oil reservoir T
It is a high pressure relief valve. The third piston of the discharge cylinder 18
Discharge syringe via the tip of the ton 18d and the connecting member 23
The pipe connected to the piston back pressure side oil chamber of the
The pressure oil flowing from the pipeline to the high pressure relief valve RV3 side
An electromagnetic switching valve biased to one position (the left position in FIG. 2);
The fourth switching valve V4 as well as the throttle 19 and its normal
The center position where the flow of the pressure oil from the fourth switching valve V4 is blocked.
(Right position in FIG. 2) as switching control means
Connected to the oil reservoir T via the fifth switching valve V5
I have. The fourth switching valve V4 controls the solenoid SOLn,
5 switching valves V5 each have a solenoid SOLm.
You. The piston back pressure side oil chamber of the discharge cylinder 18 is also provided.
The line connected to is excited by the solenoid SOLn.
The fourth switching valve V4 switches to the second position (the right position in FIG. 2).
And the fifth switching valve V is excited by the excitation of the solenoid SOLm.
When 5 is switched to the communication position (the left position in FIG. 2),
Oil recirculation via the fourth switching valve V4 and the fifth switching valve V5
It communicates with the server T. High pressure lily above
Valve RV3 (low resistance means)
The pressure acting on the back pressure side oil chamber is equal to the high pressure relief valve R
A predetermined pressure lower than the release pressure of V2 (for example, 7.1 hP
a) When the pressure reaches the above, the pressure oil is returned to the oil reservoir T.
Open as you like. Next, the electric circuit will be described with reference to FIG.
I do. In FIG. 3, reference numeral 32 denotes a power supply line, 3
Reference numeral 3 denotes an earth line, which is connected to the power supply line 32.
Each device of the garbage truck above the earth line 33
A circuit is provided for controlling the operation of. In the figure,
30a performs an operation of pushing dust into the dust pushing device A.
A push-in control circuit for causing the push-in control circuit 3
0a is a push switch SW3 for starting a push operation.
And the b contacts of the left and right stop switches SW4 and SW15;
That the first relay coil R1 is connected in series
The contact a of the first relay coil R1 is connected to the power supply line.
The in 32 is provided. Then, the push control circuit 30
a) the push switch SW3 and the stop switch SW15
A branch path 30a1 branching from
In the branch path 30a1, the upper limit position of the lift plate 8 is detected.
Contact of the upper limit switch LS1 and a fifth relay to be described later.
Continuously operate the contact b of the coil R5 and the dust pushing device A
A switch that switches between operating and operating only one cycle
Switch SW16 (interlocking terminal is energized)
Are connected in parallel, and their ends are connected to the first relay switch.
Connect the switch R1 to the terminal opposite to the push switch SW3.
Has been continued. Numeral 30b denotes an inversion control circuit, which controls the inversion.
The control circuit 30b is connected to the contact a of the upper limit switch LS1.
The b contact of the third relay coil R3 and the second relay coil R2
Are connected in series, and the second relay switch R2
Is connected in parallel with the upper limit switch LS1.
When the lifting plate 4 moves to the ascending limit position, the second switching
When the solenoid SOLf of the valve V4 is energized (the circuit is omitted)
2), the second switching valve V2 is switched, and the push plate 12 is inverted.
I am trying to. Reference numeral 30d denotes a crushing control circuit.
The crushing control circuit 30d is provided at the rear swing limit position of the pushing plate 12.
Contact of the rear switch LS3 for detecting the
The contact b of the relay coil R4 is directly connected to the third relay coil R3.
Connected to a row, and the contact a of the third relay switch R3 is
The second switch is connected in parallel with the rear switch LS3.
The time T2 is equal to the fourth relay switch R4 and the third relay coil.
Connected in parallel with the timer R3, and in parallel with the second timer T2.
Limit of 2 time limit relay coil X2 and 2nd timer switch T2
And a series circuit with the a contact of the time operation is connected.
You. 31d is a squeezing drive circuit,
The drive circuit 31d has an a contact of the third relay switch R3.
And the solenoid SOLd of the first switching valve V1 are connected in series.
Have been. That is, the control of the inversion control circuit 30b
The push plate 12 is turned over, and when it reaches its limit position,
Since the switch LS3 is operated, the crushing control circuit 3
0d is energized, and the third relay R3 is self-held.
At the same time, in the inversion control circuit 30b, the third relay
The contact b of the switch R3 is opened to open the connection of the inversion control circuit 30b.
Turn off the electricity. As a result, the second switching valve V2 is moved to the neutral position.
At the same time, the solenoid drive
SOLd, the first switching valve V1 is moved to the second position (FIG. 2).
Now switch to the right position) and lower the lift plate 8
While holding the push plate 12 to be connected in the horizontal position,
It is configured to crush garbage. Reference numeral 30e denotes a compression control circuit,
The control circuit 30e connects the contact a of the lower limit switch LS2 to the fifth
The contact b of the relay switch R5 and the fourth relay coil R4
Are connected in series, and the fourth relay switch R4
a contact and the a contact of the second timed relay switch X2
Connected in parallel with the a contact of the lower limit switch LS2.
One timer T1 is connected to the fifth relay switch R5 and the fourth relay
Connected in parallel with the coil R4 and in parallel with the first timer T1.
The first timed relay coil X1 and the first timer switch T1
And a series circuit with an a-contact for timed operation of
ing. On the other hand, 31e is a compression drive circuit,
The drive circuit 31e has a contact a of the fourth relay switch R4.
And the solenoid SOLe of the second switching valve V2 are connected in series.
It is connected. That is, the control of the crushing control circuit 30d is performed.
The push plate 12 moves down to reach the lower limit position.
And the lower limit switch LS2 operates to close its a contact,
Self-holding the fourth relay coil R4 via its a contact
At the same time as the fourth relay switch R of the crushing circuit 30d.
Open the b contact of No. 4 to energize the third relay coil R3.
Cut off. As a result, the first switching valve V1 is returned to the neutral position.
At the same time as passing through the solenoid e of the compression drive circuit 31e.
The pushing cylinder 15 is extended, and the pushing plate 12 is
Swing clockwise in FIG. 1 around the support 13, and
Next, the crushed garbage is transferred to the pressing plate 12 and the garbage input box 2.
The secondary compression between the flat surface of the bottom
I have. Reference numeral 30c denotes a push-in control circuit.
In the control circuit 30c, the forward swing limit position of the pushing plate 12 is set.
A contact of the forward switch LS4 to be detected and a second relay
B contact of switch R2 and b contact of third relay switch
And the fifth relay coil R5 are connected in series.
The contact a of the fifth relay switch R5 and the first timed relay
The a contact of the switch X1 is connected to the forward switch LS4.
Are connected in parallel with the contact a.
B contact of switch LS2 and b contact of fourth relay switch R4
A series circuit with a point is in parallel with the a contact of the front switch LS4.
Connected to a column. On the other hand, 31c is a pushing drive circuit,
The push-in drive circuit 31c includes the a of the fifth relay switch R5.
The contact and the solenoid SOLc of the first switching valve V1 are connected in series.
Connected, and a of the fifth relay switch R5
Between the contact and the solenoid SOLc and the compression drive circuit 31e
Between the fourth relay switch R4 and the solenoid SOLe.
Is a fourteenth relay switch R1 described later arranged in series.
4 through the contact a and the contact b of the fifth relay switch R5.
Connected. That is, control of the compression control circuit 30e
The push plate 12 swings forward to reach the forward swing limit position.
When it reaches, the front switch LS4 is activated and the fifth relay
When the file R5 is self-maintained in the energized state,
Communication to the fourth relay coil R4 in the compression control circuit 30e.
Turn off the electricity. Then, the second switching valve V2 is returned to the neutral position.
At the same time, switch the first switching valve V1 to the left position in the figure.
The lifting cylinder 11 is extended and the pushing plate 12 is
While maintaining the state, the lifting plate 8 is raised, and
The compressed dust is pushed into the dust storage box 1 through the dust filling port 3.
It is made to fit. Here, the features of the present invention will be described.
You. In FIG. 3, 30m and 31n are respectively
An automatic reverse control circuit, wherein one of the automatic reverse control circuits 3
0m is the a contact of the pressure switch PS and the 14th relay
While the coil R14 is connected in series,
The automatic reverse control circuit 31n has a twentieth relay coil described later.
A contact of the valve R20 and the solenoid SOL of the fifth switching valve V5
n are connected in series. 30n is automatic retreat
A switching control circuit, the automatic reverse switching control circuit
n is an automatic reverse changeover switch 37 and a twentieth relay coil.
R20 are connected in series. In addition, 31m
An automatic reverse drive circuit, wherein the automatic reverse drive circuit 31m
Is connected to the a contact of the fifth relay switch R5 and the twentieth relay.
Contact b of the relay coil R20 and the fourteenth relay coil R14
A contact and a b contact of a third timer switch T3 described later and a
And the solenoid SOLm of the four-way switching valve V4 is connected in series.
ing. And an end of the automatic reverse control circuit 30m.
Is connected to the end of the inversion control circuit 30b. That is, ordinary garbage or cardboard
Automatic retraction when dust is pushed in by dust pushing device A
Switch 37 of the switching control circuit 30n is turned on.
And the fourth switching valve of the automatic reverse control circuit 31n.
By energizing the solenoid SOLn of V4, the fourth switching valve V4
By switching to the second position (the right position in FIG. 2),
Pressure oil from the pipeline of the piston back pressure side oil chamber of the output cylinder 18
To the throttle 19 side (the fifth switching valve V5 side). At this time,
In the automatic reverse drive circuit 31m, the fifth switching valve V5
The energization of the solenoid SOLm is interrupted, and the fifth switching valve V5
Since it has returned to the normal position (middle correct position),
The pressure oil in the back pressure side oil chamber of the damper 18 flows to the high pressure relief valve RV2.
The high pressure relief valve RV2 allows the discharge cylinder 18
Is maintained in a high pressure state (about 17.9 hPa)
You. As a result, the garbage and the cardboard
The discharge plate 17 is moved into the opening 3 in response to the pushing of normal dust such as
Automatically retracts to the back of the garbage, increasing the volume of the garbage storage chamber 1a
It is made to go. Pis of the discharge cylinder 18
The oil pressure in the back pressure side oil chamber is
It is higher than the oil pressure in the compression side oil chamber. On the other hand, hard dust such as wooden products is pushed into the dust.
When the switch is pushed by the position A,
7 is switched to the off state, and the twentieth relay coil R20
Of the fourth switching valve V4 of the automatic reverse control circuit 31n.
The power supply to the solenoid SOLn is cut off and the fourth switching valve V4
Returns to the first position (the left position in FIG. 2).
The pressure oil in the back pressure side oil chamber of the cylinder 18
The high-pressure relief valve RV3 flows through the relief valve RV3.
When the back pressure of the discharge cylinder 18 is lower (7.1 hPa
Degree) is maintained. As a result, the dust pushing device A
Discharge plate 17 opens when hard dust such as wood products is pushed
It automatically retreats to the back of the part 3 to reduce the volume of the garbage storage chamber 1a.
It is being expanded. In this case, too,
The oil pressure in the piston back pressure side oil chamber of the cylinder 18 is the pushing cylinder
15 higher than the oil pressure in the piston back pressure side oil chamber
You. Further, under the control of the pushing control circuit 30c,
During the pushing process of the dust,
The oil pressure in the back pressure side oil chamber is
It becomes lower than the oil pressure of the compression side oil chamber,
Automatic retract switch when contraction operation cannot be performed smoothly
The automatic reverse changeover switch 37 of the control circuit 30n is turned on.
And the fourth switching valve V4 of the automatic reverse control circuit 31n.
To the fourth switching valve V4 by energizing the solenoid SOLn.
By switching to the position (right position in FIG. 2),
Squeeze the pressure oil from the pipeline of the piston back pressure side oil chamber of the cylinder 18.
And flow to the 19 side (the fifth switching valve V5 side). At this time,
Solenoid SO of fifth switching valve V5 of reverse drive circuit 31m
Lm is energized and the fifth switching valve V5 is brought into the communication position (in FIG. 2,
Switch to the left position) and the third timer switch T
3 is energized. As a result, the back pressure side oil of the discharge cylinder 18
The chamber is in communication with the oil reservoir T,
The pressurized oil flows into the oil reservoir T, and the discharge cylinder 18
That is, it corresponds to the dust pushing of the dust pushing device A of the discharge plate 17.
Automatic retreat to the back of the garbage bin 1
The volume of the refuse storage space 1a of the refuse storage box 1 is enlarged. So
Then, the set time of the third timer switch T3 (for example, 1 second
The third timer switch T3
Solenoid of the fifth switching valve V5 according to the opening operation of the contact b
SOLm is cut off, and the fifth switching valve V5 is in the normal position.
(Positive position), the back pressure of the discharge cylinder 18
The side is kept at high pressure. Then, pressure switch PS
Is detected to be less than the predetermined value, and once the a contact is opened,
This state is maintained until the pressure switch PS operates again
Is done. That is, the pressure switch PS is set to the predetermined value (16.3).
hPa) or more for 1 second every time a pressure of
The oil chamber on the piston back pressure side of the cylinder 18 is connected to the oil reservoir T.
Through which the discharge plate 17 is automatically retracted from the opening 3 to the back.
To gradually increase the volume of the garbage storage chamber 1a
The garbage is stored under the pressure of In this case, the automatic reverse changeover switch 37 is turned off.
Operation in the ON state or the OFF state, the fifth switching valve V5
Is switched to the communication position or the neutral position.
You. In FIG. 3, reference numeral 31h denotes a discharged syringe.
Retraction drive for retracting the da 18 from the opening 3 to the back.
The circuit, 31g, has the discharge cylinder 18 in front of the refuse filling port 3 side.
A forward drive circuit for moving
By switching of W10, the solenoid SO of the third switching valve V3
Lh or the solenoid SOLg are alternately energized to
The cylinder 18 is moved forward and backward. here
So, SW1 selects garbage pushing work or garbage discharging work
Switch. Therefore, in the above embodiment, garbage and
A place where normal waste such as cardboard is pushed into the waste storage box 1.
In the initial stage of the contraction of the discharge cylinder 18, the piston back pressure
The oil pressure in the side oil chamber is the piston back pressure side oil chamber of the push cylinder 15.
When the oil pressure is higher than the
5 to the off state, and energize the automatic reverse control circuit 30m.
Cut off to cut off the energization of the fourteenth relay coil R14
At the same time, in the automatic reverse drive circuit 31m, the fifth switching valve
Cut off the power supply to the solenoid SOLm of V5 and turn off the fifth
By returning the switching valve V5 to the normal position, the discharge
The hydraulic pressure in the pipeline communicating with the back pressure side of the
Fifth switching even if the pressure reaches or exceeds the set pressure of 5 (16.3 hPa)
Move the valve V5 to the neutral position so that it does not switch to the communication position.
It is controlled to be installed, and the back pressure of the discharge cylinder 18 is controlled.
The pressure oil in the side oil chamber flows to the high pressure relief valve RV2,
The back pressure of the discharge cylinder 18 is high due to the relief valve RV2.
The state is maintained (about 17.9 hPa). As a result,
The discharge plate 17 is opened in response to the dust pushing by the dust pushing device A.
Automatically retreats to the back of the mouth 3 and the volume of the garbage storage chamber 1a
Discharges ordinary garbage such as garbage and cardboard
It is stored in the refuse storage space 1a while compressing the plate 17
be able to. Also, hard dust such as wooden products is stored in a dust storage box.
1, when the discharge cylinder 18 is initially contracted.
The oil pressure in the piston back pressure side oil chamber is
If the oil pressure is higher than the oil pressure in the back pressure side oil chamber,
The oil chamber on the piston back pressure side of the output cylinder 18 is an oil reservoir
At T, the throttle 20 and the small set pressure (7.1 hPa)
3 Connect the self-removal valve via the high-pressure relief valve RV3.
The 20th relay
The coil R20 is demagnetized and the automatic reverse drive circuit 31m
By shutting off the power to the solenoid SOLm of the switching valve V5
When the fifth switching valve V5 is returned to the normal position (middle correct position)
In both cases, the solenoid of the fourth switching valve V4 of the automatic reverse control circuit 31n is operated.
The energization of the solenoid SOLn is cut off, and the fourth switching valve V4 is turned off.
By returning to the first position (left position in FIG. 2),
The hydraulic pressure in the pipeline communicating with the back pressure side of the discharge cylinder 18
3 Set pressure of high pressure relief valve RV3 (7.1 hPa) or more
The pressure oil in the back pressure side oil chamber of the discharge cylinder 18
Through the throttle 20 and the third high pressure relief valve RV3.
Return to the reservoir T, and the low pressure state is maintained.
You. As a result, hard dust such as wooden products is discharged from the discharge plate 17.
Can be stored in the trash storage space 1a while compressing
It is possible to push in when the dust pushing device A is pushed.
The breakage of the plate 12 can be reliably prevented. On the other hand, ordinary dust such as garbage and cardboard
Pushing garbage and hard garbage such as wood products into the garbage storage box 1
The piston at the end of contraction of the discharge cylinder 18
The oil pressure in the back pressure side oil chamber is the piston back pressure side of the push cylinder 15
If the oil pressure is lower than the oil chamber pressure,
The piston back pressure side oil chamber of the damper 18 is throttled to the oil reservoir T.
19 and 5th cut open at set pressure (16.3 hPa)
Automatic reverse switching control so as to be communicated via the switching valve V5
Turn on the automatic reverse changeover switch 37 of the circuit 30n.
Of the fourth switching valve V4 of the automatic reverse control circuit 31n
SOLn, the fourth switching valve V4 is moved to the second position (FIG. 2).
Switch to the right position).
5th cut of the automatic reverse drive circuit 31m by exciting the file R14
By energizing the solenoid SOLm of the switching valve V5, the fifth switching valve V
5 can be switched to the communication position (the left position in FIG. 2).
As a result, the detected pressure of the pressure switch PS becomes a predetermined value (16.
3hPa), the pressure of the automatic reverse control circuit 30m
The contact a of the switch PS is closed and the fourteenth relay coil R1 is closed.
4 to the energized state, and the fifth switching of the automatic reverse drive circuit 31m
By energizing the solenoid SOLm of the valve V5, the fifth switching valve V5
To the communication position (the left position in FIG. 2),
The third timer switch T3 is energized, and the third timer switch T3 is turned on.
The set time of the switch T3 (for example, about 1 second instant) elapses
Then, in response to the opening operation of the contact b of the third timer switch T3,
The energization of the solenoid SOLm of the fifth switching valve V5 is cut off
Then, the fifth switching valve V5 is returned to the normal position (middle positive position).
To maintain the back pressure side of the discharge cylinder 18 in a high pressure state.
I'm trying. As a result, the pressure switch PS is set to 16.
Every time a pressure of 3 hPa or more is detected, the discharge
The back pressure side oil chamber of the cylinder 18 communicates with the oil reservoir T.
The fifth switching valve V5 is positioned only instantaneously at the communication position.
Control, so that the discharge plate 17
Automatically move to the back to increase the volume of the garbage storage space 1a.
Normal garbage and wood products such as garbage and cardboard
Which hard garbage is compressed and compressed through the garbage
It can be stored in the refuse storage space 1a. As a result, the discharge cylinder 18
The oil pressure in the back pressure side oil chamber is the piston back pressure of the pushing cylinder 15.
When the oil pressure is lower than the oil pressure in the side oil chamber,
The contraction operation at the final contraction stage (base 18a) of the Linda 18
The discharge plate 17 is moved forward.
Consistently and smoothly performing the pushing operation of the garbage to be
it can. In the above embodiment, the automatic reverse switching mode
Switch the switch 37 on or off.
The automatic reverse changeover switch is
Even if it is automatically switched according to the type of garbage,
Of course it is good. As described above, the refuse collection vehicle of the present invention
According to the dust pushing control device, the initial stage of contraction of the discharge cylinder
At which the hydraulic pressure of the back pressure side oil chamber acts on the dust pushing device
For switching the solenoid directional control valve when the force is higher than the force
Ordinary garbage such as garbage and cardboard and wood products
The operation of pushing hard dust into the dust storage box
It can be performed smoothly without damaging the device. So
In the early stage of the contraction of the discharge cylinder,
The pressure is lower than the pressure acting on the dust pusher
The solenoid-operated directional control valve to the shut-off position and push dust
When the pressure acting on the device reaches or exceeds a predetermined value, the discharge
The oil chamber on the back pressure side of the cylinder is connected to the oil reservoir only momentarily.
With the control to make the discharge plate
It is automatically moved to the back to remove garbage and cardboard.
Garbage while compressing hard garbage such as ordinary garbage and wood products
It can be accommodated in the accommodation space. As a result, the discharge plate
Consistently smooth pushing of garbage to move forward
Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a structure of a rear part of a refuse collection vehicle provided with a refuse pushing control device according to an embodiment of the present invention. FIG. 2 is a piping diagram of a hydraulic circuit. FIG. 3 is a wiring diagram of an electric circuit. [Description of Signs] A Dust Pushing Device 1 Dust Storage Box 1a Dust Storage Space 1b Backward Space 17 Discharge Plate 18 Drain Cylinder 2 Dust Input Box 3 Dust Filling Port RV2 High Pressure Relief Valve (High Resistance Means) RV3 High Pressure Relief Valve (Low V4 Fourth switching valve (electromagnetic switching valve) V5 Fifth switching valve (switching control means) T Oil reservoir

Claims (1)

Claims: 1. A dust storage box mounted on a vehicle body and having a dust packing port at a rear side, and a dust loading box connected to the dust packing port of the dust storage box so as to be tiltable. A dust pushing device, which is provided inside the dust input box and pushes dust into the dust receiving box through the dust filling port, and is provided movably forward inside the dust receiving box; A discharge plate for partitioning the internal space of the box into a dust storage space into which dust is pushed by the dust pressing device and a space in front of the box; and a discharge for moving the discharge plate forward when contracted to change the volume of the dust storage space. A high-resistance means and a low-resistance means provided in a hydraulic circuit of the discharge cylinder and having a back pressure side oil chamber of the discharge cylinder connected to the oil reservoir via individual resistances; An electromagnetic switching valve for switching the back pressure side oil chamber of the cylinder between a position for communicating with the low resistance means and a blocking position, and a downstream side of the electromagnetic switching valve, wherein the oil pressure of the back pressure side oil chamber of the discharge cylinder is controlled by a dust pushing device. The electromagnetic switching valve is switched so that the back pressure side oil chamber of the discharge cylinder communicates with the oil reservoir via high resistance means or low resistance means when the pressure is higher than the pressure acting on the back pressure side oil chamber of the discharge cylinder. When the hydraulic pressure is lower than the pressure acting on the dust pushing device, the electromagnetic switching valve is switched to a shut-off position for the low resistance means, and when the pressure acting on the dust pushing device reaches a predetermined value or more, the back of the discharge cylinder is returned. A dust control device for a dust collection vehicle, comprising: switching control means for controlling the pressure side oil chamber to communicate with the oil reservoir only instantaneously.