JPS6348761B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a garbage collection vehicle, and more particularly to a garbage collection vehicle in which a ram cylinder device for driving a ram panel for pushing garbage is also used as a dump cylinder for opening a tailgate. About cars.

(Prior art) In conventional garbage collection vehicles, for example,
As shown in Publication No. 26214, by rotating the conveyor panel slightly upward and bringing it into contact with the surface of the ram panel, the contraction force of the dump cylinder is transmitted to the tailgate via the conveyor panel, and the tailgate is opened. I have to.

(Problems to be Solved by the Invention) In such conventional garbage collection vehicles, control of the loading mechanism becomes complicated and equipment may be damaged.

In order to solve this problem, a conceivable method is to transmit the contraction force of a ram cylinder device that drives the ram panel from the ram panel to a dump stopper on the tailgate side to open the tailgate. but,
In this case, after the dump stopper contacts the ram panel and opens the tailgate, the dump stopper remains in strong contact with the ram panel, and after the dump stopper lowers the tailgate to the closed position after discharging the garbage, It is difficult to remove the dump stopper from strong contact with the ram panel.

The present invention has been made in view of the above points, and
When the tailgate has finished lowering completely, it is detected and the ram panel is automatically rotated in the pushing direction, thereby releasing the dump stopper from the ram panel. A loading process is provided so that the dump stop can be moved to a position where it does not interfere with the ram panel, and the tailgate is moved into the loading box upon completion of lowering the tailgate and completion of rotation of the ram panel in the pushing direction. The purpose is to automatically operate the locking mechanism so that the next loading operation can be carried out without any trouble.

(Means for Solving the Problems) The present invention provides a garbage collection vehicle in which a tailgate locking mechanism is provided between the loading box and the tailgate, in which a horizontal pivot at the upper end of the loading box for storing garbage is provided at the rear opening of the loading box for storing garbage. The tailgate is pivotally mounted, and within the tailgate is a conveyor panel whose proximal end is rotated so that the tip moves along the sump in order to scrape up the waste deposited on the sump toward the cargo box. Pivots for free movement. In addition, inside the tailgate, a ram panel is pivoted above the conveyor panel and pivots in a lateral direction so as to push the garbage stirred up by the conveyor panel into the cargo box. One end of a telescopic ram cylinder device is pivotally connected to the portion projecting upward from the pivot, and the other end is pivotally connected to the upper part of the cargo box opening. The ram panel is configured to swing about its lateral axis due to the expansion and contraction movement of the ram cylinder. Furthermore, a contact portion is provided in a portion of the ram panel that protrudes upward from the lateral pivot axis, and the contact portion is located at a first position on the movement locus when the ram panel swings due to expansion and contraction of the ram cylinder device. Second
A dump stopper is supported on the tailgate so as to be rotatable between positions. Then, by contracting the ram cylinder device while the dump stopper is displaced to the first position on the movement trajectory of the ram panel contact portion, the tailgate can be rotated upward to the open position via the dump stopper. Make it. The cargo box is equipped with a tailgate lowering confirmation switch that operates when the tailgate reaches the fully lowered position, and the ram cylinder device is equipped with a pressure oil supply to either side of its piston to extend and retract the ram cylinder. Connect a switching valve to control the supply. This switching valve has
A means is provided to extend the ram cylinder device in response to the operation of the tailgate lowering confirmation switch and switch the pressure oil line so as to displace the ram panel in the pushing direction, thereby causing the ram panel to move when the tailgate is completely lowered. A push-in completion switch is provided so that the abutting portion is released from contact with the dump stopper, and a push-in completion switch is provided to detect the completion of displacement of the ram panel in the push-in direction, and both a tailgate lowering confirmation switch and a push-in completion switch are provided. Means is provided for displacing the tailgate locking mechanism in the locking direction in response to the detection operation performed by the tailgate locking mechanism. Furthermore, an electric circuit is provided to connect the tailgate lowering confirmation switch and the push-in completion switch in series, and a solenoid is inserted in series in this electric circuit to operate a switching valve to send pressure oil to the gate lock mechanism for locking. .

[Effect]

In the garbage collection vehicle configured as described above, after the rotation of the tailgate to the closed position is completed, the ram panel is automatically rotated in the garbage pushing direction to create a strong contact state between the stopper and the ram panel contact part. Then, the tailgate lowering confirmation switch and push-in completion switch detect that the ram panel has completed its rotation in the push-in direction, and accordingly, the tailgate lock mechanism is automatically activated to load the tailgate. Make sure it locks into the box.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a cargo box of a garbage collection vehicle, and a tailgate 2 is provided to open and close an opening at the rear of the cargo box 1. As shown in FIG. As is well known, the tailgate 2 is composed of both side plates 2a and a sump 2b forming a bottom plate.
The upper end of the bracket 3 above the opening of the packing box 1
It is pivotally connected to the shaft 4 by a pivot 4. A known deflector 5 is provided between both side plates 2a.

A conveyor panel 6 is pivotally mounted on the sump 2b of the tailgate 2 by a pivot 7. The conveyor panel 6 is driven by a drive device (not shown).
It rotates so that its tip moves along the sump 2b, and moves the garbage dumped on the sump 2b as shown by arrow A (Fig. 2) toward the opening of the cargo box 1. Stir and stir.

Above the conveyor panel 6, a ram panel 8 is pivotally attached to the tailgate side plate 2a by a pivot 9. The ram panel 8 swings about a pivot shaft 9 as shown by arrow B (FIG. 2), and the swing is performed by a ram cylinder device 10. The ram panel 8 has a portion 8a projecting upward from its pivot 9, and the tip of this portion 8a is pivotally attached to the tip of a piston rod 10b of a ram cylinder device 10 by a pivot 12. The upper end of the cylinder 10a of the ram cylinder device 10 is connected to the pivot 13
It is pivotally connected to the bracket 3 by. Therefore, when the ram cylinder device 10 contracts, the ram panel 8 rotates counterclockwise from the position shown in FIG. 2, and as the ram cylinder device 10 expands, the ram panel 8 moves forward toward the position shown in FIG. do.

When collecting garbage, as is well known, the conveyor panel 6 reaches the solid line position in FIG. 2 while scraping up the garbage on the sump 2b, and in this state, the
The ram panel 8, which had retreated to the right in the figure, moves forward to the left due to the extension of the ram cylinder device 10, pushing the garbage on the conveyor panel 6 into the cargo box 1.

By repeating the above operations, garbage is loaded into the cargo box 1, and when it becomes full, the tailgate 2 is opened for discharge. For this purpose,
The dump stopper 20 provided inside the tailgate side plate 2a is operated. In the illustrated example, the dump stopper 20 is in the form of a bar whose middle portion is pivotally supported on the tailgate side plate 2a by a shaft 21. A bar-shaped dump stopper 20 is provided inside each tailgate side plate 2a, and as shown in an enlarged view in FIG. It is prevented from rotating in the direction. On the other hand, the dump stopper 20 can be rotated counterclockwise in the figure. As shown in FIG. 4, the shaft 21 of the dump stopper 20 is supported by a boss 24 fixed through the tailgate side plate 2a.

A contact portion 25 is provided in a protruding manner on the protrusion portion 8a of the ram panel 8. This contact portion 25 is connected to the ram panel 8
When it rotates around its pivot 9, it is displaced along a trajectory m centered on the pivot 9, as shown in FIG. The dump stopper 20 is located between a solid line position in FIG. 3 located on this trajectory m (hereinafter referred to as the first position) and an imaginary line position located off this trajectory m (hereinafter referred to as the second position). It can be rotated freely. The first position is regulated by the stop member 22 as described above.

A base end of a link 27 is fixed to one end of a shaft 21 integral with the dump stopper 20 on the side opposite to the ram cylinder device 10 with respect to the tailgate side plate 2a. A long hole 28 is provided near the tip of this link 27. On the other hand, a pivot 30 is supported by a boss 29 fixed to the tailgate side plate 2a,
A pin 32 fixed to the tip of a link 31 protruding from this pivot 30 engages with the elongated hole 28 .

One end of a door lift arm 33 is fixed to the pivot 30 on the outside of the tailgate side plate 2a, and the other end of the door lift arm 33 is pivotally connected to a hopper door 35 by a shaft 34. During garbage loading, the hopper door 35 is pushed upward to expose the sump portion 2b, as shown in FIG.
Further, during normal driving and during and before and after the tailgate opening operation, it is pulled down as shown in FIG. 2 to cover the sump portion 2b.

As shown in FIG. 2, a discharge plate 37 is provided inside the packing box 1 so as to be able to slide back and forth, and this discharge plate 37 is normally located at the back of the packing box 1 and is used as a discharge cylinder when discharging garbage. As the device 38 is extended, it moves forward and pushes the garbage inside the packing box 1 out of the packing box 1.

In the above configuration, when the worker raises the hopper door 35 from the solid line position in FIG. 1 to the imaginary line position prior to loading garbage, the door lift arm 33 moves as shown in the solid line in FIG. 1 and as shown in FIG. 2. 3, and as a result, the pivot 30 rotates counterclockwise in FIG.
also rotates in the same direction. Therefore, the dump stopper 20 rotates from the first position to the second position and moves out of the trajectory m of the contact portion 25 of the ram panel 8. Therefore, as already mentioned, the loading operation can be performed by swinging the ram panel 8 around the pivot 9 by the expansion and contraction operation of the ram cylinder device 10.

When the inside of the cargo box 1 is full and the garbage is to be discharged, the hopper door 35 is closed after loading is completed, and the vehicle is driven to an appropriate disposal location. Keep the hopper door 35 closed during the ejection operation,
The ram cylinder device 10 is deflated. At this time, since the hopper door 35 is in the closed position, the dump stopper 20 is in the first position shown by the solid line in FIG. When the dump stopper 20 is moved, the contact portion 25 comes into contact with the lower surface of the dump stopper 20. And the ram cylinder device 10
The force in the contraction direction is transmitted to the tailgate side plate 2a via the dump stopper 20 and its shaft 21, and rotates the tailgate 2 upward. In addition,
The pushing up force of the contact portion 25 has a component that tends to rotate the dump stopper 20 clockwise in FIG.
Prevents rotation of 0.

Further, since the hopper door 35 is locked to the tailgate 2 in the closed state by a locking device (not shown), the dump stopper 20 is also locked via the door lift arm 33 and the links 31, 27, and the tailgate is locked to the tailgate 2. Reliably held in the raised position. In this way tailgate 2
After opening, the discharge plate 37 is advanced by the cylinder device 38 to discharge the garbage.

In the example described above, the contact portion 2 of the ram panel 8
5 is constituted by a dedicated protrusion that protrudes laterally, but this abutting portion may also be constituted by making the outer end of the pivot shaft 12 protrude laterally.

When discharging garbage, the tailgate 2 is rotated to the position shown by the imaginary line in Figure 2 as described above, but when loading garbage, it is securely held at the position shown by the solid line in Figure 2 to prevent it from moving unnecessarily. There must be. To this end, a tailgate locking mechanism 40 is provided as shown in FIGS. 2 and 5. This locking mechanism 40 includes an engagement pin 4 fixed behind the sump 2b of the tailgate.
1, and a locking hook 42 pivotally attached to the side of the cargo box 1 by a pin 43. The hook 42 is held in the locked position shown in FIG. 5 by a locking cylinder device 44. This cylinder device 44
The tip of the piston rod is pivotally connected to the hook 42 by a pin 45, and when hydraulic pressure is supplied behind the piston 44a of the cylinder device 44, the hook 42 continues to be engaged with the engagement pin 41, and the tailgate is closed. 2 cannot be released. On the other hand, when the piston 44a retreats and the piston rod retracts,
The hook 42 is disengaged from the engagement pin 41, and the tailgate 2 can be opened.

As already mentioned, when the tailgate 2 is in the open position shown by the imaginary line in FIG. 2, the contact portion 25 of the ram panel 8 and the dump stopper 20 contact each other with a large force. This state continues even when the tailgate 2 gradually descends due to the extension of the ram cylinder device 10, and even when the tailgate 2 is completely lowered and takes the closed position, the contact portion 25 and the dump stopper 20 are in a strong state. Contact is maintained. Therefore, after closing the tailgate, the hopper door 35
It is impossible to separate the dump stopper 20 from the abutment part 25 by opening it by hand. To this end, it is conceivable to rotate the stopper 20 with a hydraulic cylinder or to rotate the ram panel 8 clockwise in FIG. 2 by operating an operating button on the ram panel 8. However, taking such measures is not preferable because the number of hydraulic equipment used increases and the control electric circuit becomes complicated, and the operating procedure is also troublesome. On the other hand, after the tailgate 2 has been lowered to the closed position, the aforementioned tailgate locking mechanism 40 must be moved to the locked position, so naturally the tailgate locking mechanism 40 is hydraulically moved to the locked position. Steps must also be taken to relocate it.

Therefore, in the present invention, after the rotation of the tailgate 2 to the closed position is completed, the ram panel 8 is automatically rotated in the garbage pushing direction to bring the stopper 20 and the ram panel contact portion 25 into a strong contact state. and
Next, in response to the ram panel 8 completing its rotation in the pushing direction, the tailgate lock mechanism 40 is activated.
automatically operates the tailgate 20 to open the cargo box 1.
so that it locks into place.

FIG. 6 shows a hydraulic circuit for operating the mechanism shown in FIG. In the figure, reference numeral 46 denotes an electromagnetic switching valve that controls the expansion and contraction of the discharge cylinder device 38, and has solenoids SOLa1 and SOLb1. 47 and 48 are connected. 49 is an electromagnetic switching valve that controls the hydraulic motor 50 for rotating the conveyor panel 6, and has solenoids SOLa2 and SOLb2. Also,
Reference numeral 52 denotes an electromagnetic switching valve that controls expansion and contraction of the ram cylinder device 10, and has solenoids SOLa3 and SOLb3, and is connected to the cylinder space on both sides of the piston of the ram cylinder device 10 by pipes 53 and 54. 56 is solenoid SOL4
This is an electromagnetic switching valve for lowering the tailgate, which is connected to the pipe line 53 via the pipe line 57. A tailgate lock electromagnetic switching valve 58 having a solenoid SOL5 is inserted into the pipe line 48.
This electromagnetic switching valve 58 is connected to the lock side cylinder space of the lock cylinder device 44 via a conduit 59. The cylinder space on the opposite side of this cylinder device 44 communicates with the line 47 by a line 60 . A pipe line 61 connecting the electromagnetic switching valve 46 and the pump P is connected to a pipe line 62, to which the electromagnetic switching valve 56 is connected via a relief valve 63.

FIG. 7 shows an electric circuit for sequentially operating the electromagnetic switching valves of the hydraulic circuit shown in FIG. In the figure, LS−
1 is a tailgate lowering confirmation switch, which is provided at the rear lower end of the vehicle body supporting the cargo box 1 as shown in FIG. 2. When the tailgate 2 finishes lowering to the solid line position in FIG. The circuit is closed by being pressed by the part. This switch LS-
1 is configured as two sets of interlocking double-throw switches, one set of switches is a delay relay TDR.
is connected to the solenoid SOLa1 via the normally open contact TDR1, and the normally closed contact of the other set of switches is connected to the solenoid SOL4. The delay relay TDR has a normally closed contact TDR2. LS−
2. LS-3 is a tailgate lock switch,
These are provided one each on the left and right sides of the vehicle body, and in particular, as shown in FIG.
When the hook 42 rotates in the direction in which the zero lock is released, the circuit is pressed and closed. SW1 is the tailgate operation switch, SW2
is the discharge plate operation switch, and SW3 is the main switch. In addition, in this circuit diagram, the circuit of the solenoids SOLa2 and SOLb2 of the electromagnetic switching valve 49 that controls the conveyor panel motor 50 is not particularly related to the gist of the present invention, and therefore is not shown.

L-S4 is a limit switch provided on the side wall of the tailgate 2. As shown in FIG.
is fixed. Although the shape of the cam 45 is not limited to the illustrated shape, in the illustrated example, the cam 45 is
Its main body has an arc shape centered on the axis 9,
Only the tip portion 45a is formed so that the radius gradually decreases toward the tip. This cam 45
acts on the limit switch LS-4.
In the position shown in Figure 3, the cam 45 is a limit switch.
Although it is not acting on LS-4, when the ram panel 8 rotates to the push-in completion position shown by the imaginary line in FIG.
-4 and the limit switch operates. Therefore, this switch LS-4 functions as a switch for detecting the completion of pushing.

When pushing garbage into the cargo box 1, the solenoid SOLb3 is energized by the operation of a circuit (not shown), the electromagnetic switching valve 52 is switched to the left in FIG. 6, and the pressure oil is switched to the pump P. From pipe line 61,6
4. It is supplied to the space above the piston of the ram cylinder device 10 via the electromagnetic switching valves 49 and 52 and the pipe line 54. In this way, when the pushing of the garbage into the cargo box 1 is completed and the garbage is to be discharged, the dump stopper 20 is moved to the first position, the lock mechanism 40 is released, and the ram cylinder device 10 is retracted. It may be necessary to rotate the tailgate 2 upward, but for this purpose,
Turn the tailgate operation switch SW1 to the side that contacts the upper contact point. At this time, the main switch
SW3 has already been switched to the right side of the contact in Figure 7, and the tailgate lock switch has also been switched to the right side of the contact in Figure 7.
LS-2 and LS-3 are closed when the lock mechanism 40 is opened, and are switched to the side in contact with the lower normally open contact, so the solenoid SOLa3 is energized at the same time as the switch SW1 is turned on, and the switching valve 52 is turned on. Moving to the right, the pressure oil is sent from the pipe 64 to the cylinder space below the ram cylinder device 10 via the pipe 53, and as the ram cylinder device 10 contracts, it passes through the dump stopper 20 in the first position and reaches the tailgate. 2 is released. Next, press the discharge plate operation switch.
When SW2 is closed to the upper contact side, the solenoid
SOLb1 is energized, the switching valve 46 is switched to the left, and the pressure oil is sent from the pipe 61 to the cylinder space behind the discharge cylinder device 38 via the pipe 47,
The discharge plate 37 moves forward and the garbage in the cargo box 1 is discharged.

After the garbage removal work is completed as described above,
Switch the discharge valve operation switch SW2 to the lower contact. As a result, the solenoid SOLa1 is energized, and the pressure oil is sent from the pipe line 61 through the switching valve 46 and the pipe line 48 into the cylinder space at the front (right side in the figure) of the discharge cylinder device 38, and the discharge plate 37 is Retreat to the back of cargo box 1. After the retreat is completed, the discharge valve operation switch SW2 is opened.

When the tailgate operation switch SW1 is switched to the lower contact point to lower the tailgate 2, the solenoid SOL5 is energized and the switching valve 58 moves to the left, but no movement of pressure oil occurs. On the other hand, by switching the tailgate operating switch SW1 downward, the solenoid SOL4 is energized via the tailgate lowering confirmation switch LS-1 whose lower contact is closed. As a result, the switching valve 56 is switched to the left, and the piston rod side cylinder space of the ram cylinder device 10 is connected to the pipes 53, 57 and the switching valve 5.
6. Since it communicates with the oil sump via the pipe 65, the ram cylinder device 10 gradually extends and the tailgate 2 begins to descend.

When the lowering of the tailgate 2 is completed, the tailgate lowering confirmation switch LS-1 is pushed by the tailgate, and the upper normally open contact of this switch is switched to the closed side. At this time, the switch LS-4 is not under the action of the cam 45, so its upper normally closed contact is closed, so the switch LS-4 is closed.
At the same time as LS-1 is switched upward, solenoid SOLb3 is activated via switches LS-1 and LS-4.
is excited, the switching valve 52 switches to the left, and the pressure oil flows through the pipe line 61, the switching valve 46, the pipe line 64, and the switching valve 4.
9, 52 and the pipe line 54 to the cylinder space above the piston of the ram cylinder device 10,
The ram cylinder device 10 is given an extension force and rotates the ram panel 8 in the direction of pushing in the garbage. As a result, the contact portion 25 of the ram panel 8 is released from the strong contact state with the dump stopper 20.

When the ram panel 8 rotates in the dust pushing direction and reaches the pushing completion position, the cam 45 operates the pushing completion switch LS-4, and the switch is switched to the side where the upper contact point is closed. As a result, the excitation of the solenoid SOLb3 is cut off, and the switching valve 52 returns to the neutral position, while the solenoid SOLa1 is energized via the switches LS-1 and LS-4, and the switching valve 4
6 is switched to the right, the pressure oil is transferred to the pipe 6.
1. It is sent into the cylinder space behind the piston 44a of the locking cylinder device 44 through the switching valve 46, the locking switching valve 58 which has already been switched to the left, and the pipe 59, and the piston 44a advances and the hook 42 is moved. The tailgate 2 is rotated clockwise in FIG. 5, the locking mechanism 40 is locked, and the tailgate 2 is secured to the cargo box 1.

〔Effect of the invention〕

As described above, according to the present invention, the ram panel is automatically rotated in the pushing direction after the tailgate is lowered after the garbage discharge operation, so that no intervention is required. The dump stopper can be automatically displaced without any interference, and the dump stopper can be moved to a position where it does not interfere with the ram panel. The tailgate is automatically locked into the cargo box only after the completion of the displacement of the ram panel in the pushing direction is detected, without the need for human intervention.
The tailgate is now locked and ready for the next garbage loading operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of the garbage collection vehicle of the present invention;
Fig. 2 is a vertical sectional side view of the same main part, Fig. 3 is an enlarged side view of a part of Fig. 2, Fig. 4 is a partially cutaway rear view of the same part,
Figure 5 is an enlarged view of the tailgate lock mechanism, Figure 6
The figure is a hydraulic circuit diagram, and FIG. 7 is an electric circuit diagram. 1... Packing box, 2... Tailgate, 2b... Sump, 4... Axis, 6... Conveyor panel, 7...
...Axis, 8...Ram panel, 9...Axis, 10...
...Ram cylinder device, 12, 13... Pivot, 20
... Dump stopper, 21 ... Shaft, 22 ... Stop member, 25 ... Contact portion, 37 ... Discharge plate, 40 ...
...Tailgate lock mechanism, 44...Lock cylinder device, 46, 49, 52, 56...Solenoid switching valve, 58...Lock electromagnetic switching valve, LS-1...
...Tailgate lowering confirmation switch, LS-2, LS
-3...Switch for tailgate lock, LS-
4...Ram panel pushing completion confirmation switch, SW
1...Tailgate operation switch, SW2...Ejection plate operation switch, SW3...Main switch.

Claims (1)

[Claims] 1. A tailgate is pivotally attached to the rear opening of a loading box that accommodates garbage by a horizontal pivot at its upper end, and a tailgate is provided within the tailgate for scooping up the garbage placed on the sump toward the loading box. The base end of the conveyor panel is rotatably attached so that the tip moves along the sump, and inside the tailgate, there is also a loading box above the conveyor panel to store the garbage scraped up by the conveyor panel. A ram panel that is rotatably displaced so as to be pushed inward is pivoted by a lateral pivot, and one end of a telescoping ram cylinder device is pivoted to a portion of the ram panel that protrudes upward from the lateral pivot, and the other end is pivoted. is pivoted to the top of the loading box opening,
The ram panel is configured to swing about its lateral axis due to the expansion and contraction movement of the ram cylinder,
In a garbage collection vehicle equipped with a tailgate lock mechanism between the cargo box and the tailgate, an abutting part is provided on the part of the ram panel that protrudes upward from the lateral axis, so that when the ram panel swings due to the expansion and contraction of the ram cylinder device. A dump stopper is supported on the tailgate so as to be rotatable between a first position on the movement trajectory of the abutment part and a second position deviated from this position, and the dump stopper is supported on the tailgate so as to be rotatable between a first position on the movement trajectory of the abutment part and a second position deviated from this position. By retracting the ram cylinder device while the ram cylinder device is displaced to the first position, the tailgate can be rotated upward to the open position via the dump stopper, and the cargo box is placed in the fully lowered position of the tailgate. A tailgate lowering confirmation switch is provided which operates in response to the arrival of the tailgate, and a switching valve is connected to the ram cylinder device to control the supply of pressure oil to either side of the piston so that the ram cylinder device expands and contracts. The valve is provided with means for extending the ram cylinder device in response to the operation of the tailgate lowering confirmation switch and switching the pressure oil pipe line so as to displace the ram panel in the pushing direction; A push-in completion switch is provided to detect the completion of the displacement, and an electric circuit is provided to sequentially operate the electromagnetic switching valve that connects the tailgate lowering confirmation switch and the push-in completion switch in series. A garbage collection vehicle characterized in that a solenoid is inserted in series to operate an electromagnetic switching valve provided in a hydraulic circuit so as to send pressure oil for a garbage collection vehicle.