JP5484128B2 - Garbage truck - Google Patents

Description

  The present invention relates to a garbage collection vehicle capable of loading garbage such as garbage and oversized garbage.

  A conventional garbage collection vehicle includes a garbage input box that is connected to the rear part of the garbage storage box so as to be openable and closable. The dust thrown into the dust throwing box is loaded into the dust container box by operating the pushing plate by the expansion and contraction operation of the loading drive cylinder. The garbage input box can be opened and closed by extending the input box drive cylinder (see, for example, Patent Document 1).

  The charging box driving cylinder and the loading driving cylinder are connected to a hydraulic pump via three-position electromagnetic switching valves each having a pair of solenoids. When the dedicated box operating cylinder and the loading driving cylinder are operated, the solenoids of the corresponding three-position electromagnetic switching valves are excited, respectively, so that they are individually expanded and contracted. Yes.

JP 2007-55745 A

In a conventional garbage collection vehicle, when the three-position electromagnetic switching valve connected to each of the input box drive cylinders fails due to, for example, a wiring short-circuit, this failed electromagnetic switching is not performed. In some cases, one solenoid of the valve was held in an excited state. Specifically, for example, when the loading operation is performed by operating the operation switch of the loading drive cylinder, the three-position electromagnetic switching valve that operates the closing box driving cylinder breaks down. When the solenoid is excited, the throwing box drive cylinder may operate without permission and the dust throwing box may be opened. In this case, since the dust input box is opened during the loading operation, there is a problem that the dust loaded in the dust storage box falls out of the box and is scattered around.
The present invention has been made in view of the above-described problems, and provides a garbage collection vehicle capable of suppressing the malfunction of the dust input box when the dust input box is not opened and closed. With the goal.

  In order to achieve the above object, a garbage collection vehicle according to the present invention is provided with a dust container, a dust container that is openably and closably connected to the dust container, and has a dust inlet at a rear part thereof. An input box driving means having a hydraulic actuator that opens and closes the dust input box by individually energizing a pair of solenoids of the position electromagnetic switching valve, and an operation of individually exciting each solenoid of the three-position electromagnetic switching valve A waste collection vehicle equipped with an input box operation means for outputting a command; and a detecting means for detecting that one of the pair of solenoids is excited to drive the input box driving means. The other solenoid of the pair of solenoids when the detecting means detects the driving of the charging box driving means in a state where no operation command is output from the charging box operating means. It is characterized by comprising a control device for energizing the.

  According to the garbage collection vehicle having such a configuration, the detecting means detects that one of the solenoids is excited and the closing box driving means is driven in a state where no operation command is output from the closing box operating means. When the other solenoid is excited by the control device, the three-position electromagnetic switching valve is held in the neutral position by changing the excitation force of the other solenoid to an excitation force that balances the excitation force of one solenoid. Can be made. As a result, it is possible to prevent the dust input box from malfunctioning when the dust input box is not opened or closed.

In addition, the garbage collection vehicle of the present invention outputs a loading drive means that operates when loading the dust thrown into the dust throwing box into the dust storage box, and an operation command for operating the loading drive means. Loading operation means, and an opening solenoid that is excited when the pair of solenoids of the three-position electromagnetic switching valve drives the charging box driving means to open the dust box, and A closing solenoid that is excited when the input box driving means is driven to close the dust input box, and the detecting means is excited by the opening solenoid and driven by the input box driving means. The control device is in a state in which no operation command is output from the input box operating means and in a state in which an operation command is output from the loading operation means, When serial detection means detects the driving of the closing box driving means, it is preferable to excite the closing solenoid.
In this case, when the loading driving means is operated by the loading operation means, the control is performed when the detecting means detects that the opening solenoid is excited and the throwing box driving means is driven. Since the closing solenoid is excited by the device, the three-position electromagnetic switching valve can be held in the neutral position by setting the exciting force of the opening solenoid to an exciting force that balances the exciting force of the closing solenoid. . As a result, when the loading drive means is operated by the loading operation means, it is possible to prevent the throwing box driving means from malfunctioning due to a failure of the three-position electromagnetic switching valve and opening the dust charging box. it can. Therefore, it is possible to prevent the dust in the dust storage box from dropping to the outside by opening the dust input box during the loading operation.

  According to the refuse collection vehicle of the present invention, it is possible to prevent the dust throwing box from malfunctioning when the dust throwing box is not opened or closed.

It is the sectional side view which looked at the garbage truck of this invention from the port side. It is a rear view of a garbage truck. It is a side view of the rear part side of a garbage truck. It is a side view which shows the state which unlocked the dust input box. It is a hydraulic circuit diagram of a garbage truck. It is a front view of a switch box of a garbage truck. It is a block diagram of the control apparatus of a garbage truck. It is a flowchart which shows the process performed in a control apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a garbage truck according to an embodiment of the present invention as seen from the port side. In the figure, the garbage collection vehicle 1 includes a dust storage box 2 mounted on a vehicle body 1a, and a dust input box 3 provided continuously behind the dust storage box 2. An opening 2 a is formed on the rear surface of the dust container 2. At the rear part of the dust input box 3, an input port 3a into which dust is input is formed, and a lid 3b that slides the input port 3a up and down to open and close is provided. An opening 3 d for accommodating the dust thrown into the dust throwing box 3 in the dust throwing box 2 is provided at the lower front part of the dust throwing box 3.

  The dust input box 3 can be rotated around a fulcrum P provided at the upper portion thereof, and can be opened and closed with respect to the dust container box 2. As shown by the solid line in the figure, the garbage throwing box 3 closes the opening 2a of the dust container box 2 and opens the opening 2a by rotating upward as shown by the two-dot chain line in the figure. It is designed to rotate between an open position where it can be discharged.

  Next, the loading device T provided in the dust box 3 will be described. First, left and right side walls 3c of the dust box 3 are provided with guide rails 4 extending obliquely up and down, and a pair of left and right rollers 6 attached to the slider 5 are obliquely up and down inside the guide rails 4. Can move. The slider 5 is formed by connecting the left and right side members as shown in the figure by a plate or the like (not shown) extending in the vehicle width direction. Further, a pushing plate 8 is rotatably attached to the lower end portion of the slider 5 via a pin 7. The pushing plate 8 is also formed by connecting and connecting left and right members having a side surface shape as illustrated by a plate or the like (not shown) extending in the vehicle width direction.

  On the other hand, the cylinder side end of the push cylinder 9 is attached to the left and right side walls 3 c by pins 10, and the piston side end is connected to the upper end of the slider 5 by pins 11. On the other hand, the cylinder side end of the press cylinder 12 is connected to the pushing plate 8 by a pin 13, and the piston side end is connected to the upper end of the slider 5 by the pin 11. Along with the pushing plate 8, the slider 5 rises obliquely by the extension operation of the push cylinder 9, and descends obliquely by the contraction operation. Further, the pushing plate 8 rotates clockwise around the pin 7 by the extension operation of the press cylinder 12, and rotates counterclockwise by the contraction operation.

  As a result, the pushing plate 8 performs a “reverse” stroke in which the push plate 8 rotates counterclockwise around the pin 7 by the contraction operation of the press cylinder 12 from the original position indicated by the solid line in the drawing. Further, after the reversing process, the pushing plate 8 performs a “primary compression” stroke by the contraction operation of the push cylinder 9, and subsequently a “secondary compression” stroke that rotates clockwise by the extension operation of the press cylinder 12. I do. Further, the pushing plate 8 performs a “pushing” stroke by the extension operation of the push cylinder 9 and returns to the original position. In this embodiment, the push cylinder 9 and the press cylinder 12 constitute the loading drive means 71.

  In FIG. 1, a discharge plate 18 is provided inside the garbage storage box 2 so as to be movable in the front-rear direction of the vehicle. One end 19 a of a telescopic discharge cylinder (discharge driving means) 19 is connected to the discharge plate 18, and the other end 19 b is connected to the dust container 2. The discharge plate 18 is movable between a rear position indicated by a solid line and a front position indicated by a two-dot chain line in FIG.

  When the dust is empty, the discharge plate 18 is in the rear position, and the dust loaded in the dust storage box 2 by the push plate 8 is compressed between the push plate 8 and the discharge plate 18. When the amount of dust loaded increases, a pressure control valve 23c described later operates to gradually contract the discharge cylinder 19 and move the discharge plate 18 forward. Further, by extending the discharge cylinder 19 and moving the discharge plate 18 rearward, the dust stored in the dust storage box 2 can be discharged to the outside from the opening 2a.

  FIG. 2 is a rear view of the garbage truck 1. A pair of swing cylinders (hydraulic actuators) 20 disposed at both left and right ends of the dust box 3 are attached to the dust container 2 side (see FIG. 1), and the lower end is attached to the dust box 3. When the swing cylinder 20 is extended, the dust input box 3 is rotated upward (opened), and when it is contracted, the dust input box 3 is rotated downward (closed).

  FIG. 3 is a side view of the rear side of the garbage truck 1. A stiffener 2b for reinforcement is formed at the rear end edge of the dust container 2. A first proximity sensor 51 is attached to the inside of the stiffener 2b via a stay 50. The first proximity sensor 51 detects that the dust input box 3 is in the closed position by detecting the dog 52 fixed to the dust input box 3. Then, when the dog 52 is rotated upward together with the dust input box 3 and is separated from the first proximity sensor 51, the first proximity sensor 51 is in a non-detection state, and the dust input box 3 is rotated upward from the closed position. Can be detected.

  In FIG. 3, a lock device 60 is provided at the rear part of the vehicle body 1a for securing the dust box 3 to the vehicle body 1a. The lock device 60 includes a hook 61 rotatably attached to the vehicle body 1a, a lock pin 62 fixed to the dust box 3 side, and a lock cylinder (hydraulic actuator) 63 for rotating the hook 61. And a connecting mechanism 64 that connects the hook 61 and the lock cylinder 63.

  The hook 61 is rotatably attached to a bracket 65 fixed to the lower surface of the vehicle body 1a via a pin 66. The lock pin 62 is fixed to the lower front surface of the dust box 3, and the front end portion of the hook 61 is engaged so as to be disengaged from below. The cylinder side end of the lock cylinder 63 is attached to the lower part of the dust container 2 via a pin 67. A piston side end of the lock cylinder 63 is attached to a first connection bracket 64b described later via a pin 68. The piston diameter of the lock cylinder 63 is smaller than the piston diameter of the swing cylinder 20.

  The connection mechanism 64 includes a torque shaft 64a rotatably attached to the bottom of the dust container 2, a first connection bracket 64b and a second connection bracket 64c fixed to the outer peripheral surface of the torque shaft 64a, and a second connection. It is comprised by the connection piece 64d which has connected the bracket 64c and the hook 61. FIG. One end of the connecting piece 64d is attached to the second connecting bracket 64c via a pin 69, and the other end of the connecting piece 64d is attached to the base end portion of the hook 61 via a pin 70.

  With the above configuration, when the lock cylinder 63 is extended from the state shown in FIG. 3, the torque shaft 64a rotates counterclockwise in FIG. 3 via the first connection bracket 64b. 4, the connecting piece 64d is pushed rightward in FIG. 3 via the second connecting bracket 64c, as shown in FIG. 4, and the hook 61 rotates around the pin 66 in the clockwise direction in FIG. As a result, the engagement between the hook 61 and the lock pin 62 is released, and the dust box 3 is unlocked. When the lock cylinder 63 is contracted from the state shown in FIG. 4, the coupling mechanism 64 moves in the reverse direction to the above, so that the hook 61 engages with the lock pin 62, and the dust throwing box 3 opens the opening 2a. Locked in the closed state. In the present embodiment, the lock box 63 and the swing cylinder 20 constitute the input box drive means 72.

3 and 4, a second proximity sensor 55 is attached to the lower part of the dust container 2. As shown in FIG. 3, the second proximity sensor 55 detects the dog 56 protruding from the outer peripheral surface of the torque shaft 64a when the dust box 3 is locked by the lock device 60. When the dog 56 rotates counterclockwise in FIG. 4 together with the torque shaft 64a as shown in FIG. 4 and moves away from the second proximity sensor 55, the second proximity sensor 55 enters a non-detection state, and the dust input box. It can be detected that 3 is unlocked. Accordingly, when the second proximity sensor 55 is not detected, the unlocking operation of the swing cylinder 20 can automatically rotate the dust throwing box 3 unlocked upward.
In the present embodiment, the first proximity sensor 51 and the second proximity sensor 55 constitute a detection means 57.

  FIG. 5 is a hydraulic circuit diagram relating to the push cylinder 9, press cylinder 12, discharge cylinder 19, swing cylinder 20, and lock cylinder 63. The hydraulic circuit includes an oil tank 21, a hydraulic pump 22, pressure control valves 23a to 23f, an electromagnetic switching valve 24 for a push cylinder, an electromagnetic switching valve 25 for a press cylinder, an electromagnetic switching valve 26 for a discharge cylinder, and an electromagnetic switching valve for a lock cylinder. An electromagnetic switching valve for a swing cylinder (three-position electromagnetic switching valve) 27, switching valves 28a to 28b, check valves 29a to 29g, filters 30a to 30b, and a pressure sensor 32 are connected as shown in the figure. Has been.

  Each of the electromagnetic switching valves 24 to 27 is a three-position electromagnetic switching valve having a pair of solenoids, and is held in a neutral position when both solenoids are in a demagnetized state. When each of the electromagnetic switching valves 24 to 27 is in the neutral position as shown in FIG. 5, the hydraulic oil (working fluid) discharged from the hydraulic pump 22 passes through the electromagnetic switching valves 24 to 27 and the oil tank 21. To be refluxed.

  When the pushing plate 8 is stopped at the original position, the push cylinder 9 and the press cylinder 12 are both in the extended state, and the corresponding electromagnetic switching valves 24 and 25 are in the neutral position. When the solenoid 25s of the press cylinder solenoid switching valve 25 is energized, it is “reversed”, when the solenoid 25e is energized, “secondary compression”, and when the solenoid 24s of the push cylinder solenoid selector valve 24 is energized, “primary compression”. "When the solenoid 24e is energized," stepping "is performed.

  When the discharge plate 18 is stopped at the rearmost position (solid line in FIG. 1), the discharge cylinder 19 is in the most extended state, and the discharge cylinder electromagnetic switching valve 26 is in the neutral position. When the solenoid 26e of the discharge cylinder electromagnetic switching valve 26 is excited, the discharge cylinder 19 is extended. When the solenoid 26s is excited, the discharge cylinder 19 is contracted. When the solenoid 26s is demagnetized from this state, the discharge cylinder electromagnetic switching valve 26 returns to the neutral position, and the contraction operation of the discharge cylinder 19 stops. However, if the pressure control valve 23c is operated, the discharge cylinder 19 can be contracted even if the discharge cylinder electromagnetic switching valve 26 is in the neutral position, and the discharge plate 18 can be moved forward.

  When the dust bin 3 is in the closed position (solid line in FIG. 1), the swing cylinder 20 is in the most contracted state, the swing cylinder electromagnetic switching valve 27 is in the neutral position, and the switching valve 28b is in the illustrated position. . When the solenoid 27e (opening solenoid) of the swing cylinder electromagnetic switching valve 27 is excited from this state, hydraulic oil is simultaneously supplied to the lock cylinder 63 and the swing cylinder 20, but the piston diameter (pressure receiving area) is small. The lock cylinder 63 extends before the swing cylinder 20, and the dust input box 3 is unlocked by the lock device 60. After unlocking, the swing cylinder 20 starts to extend, and the dust box 3 is rotated upward from the closed position.

  When the solenoid 27e is demagnetized and the switching valve 28b is excited, the hydraulic oil in the swing cylinder 20 is returned to the tank 21 via the switching valve 28b and the swing cylinder electromagnetic switching valve 27 by the dead weight of the dust throwing box 3. As a result, the swing cylinder 20 is contracted, and the dust box 3 is rotated downward. Further, when the solenoid 27s (closing solenoid) of the swing cylinder electromagnetic switching valve 27 is energized after the dust input box 3 reaches the closed position, the lock cylinder 63 contracts and the dust input box 3 is locked. Locked by 60. Thereafter, the solenoid 27s is demagnetized, but is held in the locked state (contracted state) of the lock cylinder 63 by the check valve 29g.

  FIG. 6 is a plan view showing the switch box SB1 provided in the cab. The switch box SB1 is provided with a main switch 34, a tailgate switch 35, a discharge plate switch 36, a scraping switch 37, a main lamp (notification means) 38, and a lock lamp 39.

  The main switch 34 is a switch that can be held at any one of the positions “loading”, “OFF”, and “discharge”. By operating from the “OFF” to the “loading” position, the push cylinder 9 and the press cylinder 12 are allowed to operate, and the operations of the discharge cylinder 19, the swing cylinder 20 and the lock cylinder 63 are restricted. In the “discharge” position, the discharge cylinder 19, the swing cylinder 20 and the lock cylinder 63 are allowed to operate, and the push cylinder 9 and the press cylinder 12 are restricted from operating.

The tailgate switch 35 is an operation switch that outputs an operation command for individually exciting the solenoid 27e and the solenoid 27s of the swing cylinder electromagnetic switching valve 27 for extending and contracting the lock cylinder 63 and the swing cylinder 20.
When the input box drive switch 35 is operated to “up”, the solenoid 27e is excited, the lock cylinder 63 extends, and the dust input box 3 is unlocked. After unlocking, the swing cylinder 20 is extended to rotate the dust box 3 upward.
Further, when the input box drive switch 35 is operated to “down”, the solenoid 27s is excited, the swing cylinder 20 is contracted, and the dust input box 3 is rotated downward to the closed position. After the downward rotation, the lock cylinder 63 is contracted and the dust box 3 is locked. The input box drive switch 35 is a type of switch that returns to the neutral position of the “tailgate” when released.

The discharge plate switch 36 is an operation switch for outputting an operation command for individually exciting the solenoids 26e and 26s of the discharge cylinder electromagnetic switching valve 26 for extending and contracting the discharge cylinder 19.
When the discharge plate switch 36 is operated to “discharge”, the solenoid 26e is excited, the discharge cylinder 19 is extended, and the discharge plate 18 is retracted to the rearmost position.
When the discharge plate switch 36 is operated to “return”, the solenoid 26s is excited and the discharge plate 18 returns to the initial position. It is a type of switch that returns to the neutral position of the “discharge plate” when it is released.

The scraping switch 37 is a selection switch of “automatic” or “manual”, and in the “automatic” position, when the garbage throwing box 3 is rotated to the upper end, an operation similar to loading is automatically performed. The dust remaining at the bottom of the input box 3 can be discharged.
The main lamp 38 is turned on when each switch operation of the switch box SB1 is possible. Further, the main lamp 38 blinks when one of the first proximity sensor 51 and the second proximity sensor 55 is in a non-detection state while operating a loading switch 43 described later. Yes. Thereby, it is possible to notify the operator that the lock cylinder 63 is malfunctioning.
The lock lamp 39 is lit when the dust container 3 is locked by the lock device 60.

  On the other hand, in FIG. 2, switch boxes SB2 and SB3 are provided at the rear portions of the left and right side walls 3c of the dust box 3, respectively. On the side surface of the switch box SB2, there is provided an operation selection switch 42 for selecting an operation mode of “continuous cycle” or “1 cycle” as the operation of the pushing plate 8. On the front face of the switch box SB2, a loading switch (loading operation means) 43 for starting the loading operation in each operation mode and a stop switch 44 for stopping the continuous cycle operation are provided.

The loading switch 43 is an operation command for individually exciting the solenoids 24e, 24s, 25e, and 25s of the push cylinder electromagnetic switching valve 24 and the press cylinder electromagnetic switching valve 25 that respectively extend and retract the push cylinder 9 and the press cylinder 12. Is an operation switch that outputs.
The other switches are switches that are used only in an emergency and will not be described in detail. The stop switch 44 is also provided in the right switch box SB3.

FIG. 7 is a block diagram showing the configuration of the control device 47. The control device 47 is a part of a PLC (programmable logic controller) and includes a CPU, a memory, and the like. Operation commands for the main switch 34, the loading switch 35, the discharge plate switch 36, and the ejection switch 37 of the switch box SB1 and the operation commands for the loading switch 43 and the stop switch 44 of the switch box SB2 are input to the control device 47. The The detection signals of the first proximity sensor 51 and the second proximity sensor 55 are input to the control device 47.
The solenoids 24e to 27e and 24s to 27s of the push cylinder electromagnetic switching valve 24, the press cylinder electromagnetic switching valve 25, the discharge cylinder electromagnetic switching valve 26, and the swing cylinder electromagnetic switching valve 27 are excited and demagnetized by the controller 47. Is done. Further, the main lamp 38 and the lock lamp 39 are turned on by an output signal from the control device 47.

  Next, the control related to the present invention of the garbage truck configured as described above will be described with reference to the flowchart of FIG. When the processing starts, the CPU of the control device 47 (hereinafter simply referred to as CPU) waits for the loading switch 43 to be turned on (step S1), and when turned on, the push cylinder electromagnetic switching valve 24 and the press cylinder electromagnetic switching valve. The 25 solenoids 24e, 24s, 25e, 25s are respectively excited (step S2), and the loading operation is started by the pushing plate 8.

  During the loading operation, if the swing cylinder electromagnetic switching valve 27 that operates the swing cylinder 20 fails, the solenoid 27e of the electromagnetic switching valve 27 may be excited and held in this excited state. In this case, in spite of operating the loading switch 43, the loading operation by the pushing plate 8 is stopped and the dust throwing box 3 is unlocked and rotated upward. . In order to prevent this malfunction, the CPU monitors whether or not the garbage throwing box 3 is unlocked based on the detection state of the second proximity sensor 55 (step S3).

  When the dust throwing box 3 is unlocked and the second proximity sensor 55 is turned off due to a failure of the swing cylinder electromagnetic switching valve 27, the CPU proceeds to step S5. At that time, if muddy water or the like adheres to the detection surface of the second proximity sensor 55 and is kept in the ON state, the first proximity sensor indicates that the unlocked dust bin 3 has started to rotate upward. This can be detected by turning off 51 (step S4). Also in this case, the CPU proceeds to step S5. If both the second proximity sensor 55 and the first proximity sensor 51 are in the on state, the process returns to step S3.

  In step S5, the CPU excites the solenoid 27s of the swing cylinder electromagnetic switching valve 27. At this time, the exciting force of the solenoid 27s is set to an exciting force that balances the exciting force of the solenoid 27e. As a result, the exciting force of the solenoid 27e and the exciting force of the solenoid 27s are balanced, whereby the swing cylinder electromagnetic switching valve 27 is held at the neutral position in FIG. 5, and the dust throwing box 3 (swing cylinder 20) malfunctions. Can be regulated.

  Next, the CPU blinks the main lamp 38 to notify the operator that the lock device 60 (lock cylinder 63) is malfunctioning (step S6), and also includes a discharge plate switch 36, a scraping switch 37, and loading. Each operation input of the switch 43 is invalidated (input is not accepted) (step S7).

  According to the refuse collection vehicle 1 of the present embodiment configured as described above, during the operation of the loading switch 43, the solenoid 27e is excited by the failure of the swing cylinder electromagnetic switching valve 27 and the lock cylinder 63 is activated. When the second proximity sensor 55 detects that the solenoid 27e has been operated, the solenoid 27s paired with the solenoid 27e is excited, so that the excitation force of the solenoid 27s is changed to an excitation force that balances the excitation force of the solenoid 27e. The swing cylinder electromagnetic switching valve 27 can be held in the neutral position. Accordingly, it is possible to prevent the swing cylinder 20 from malfunctioning due to the failure of the swing cylinder electromagnetic switching valve 27 during the operation of the loading switch 43. Therefore, it is possible to prevent the dust in the dust storage box 2 from falling outside by opening the dust throwing box 3 during the loading operation.

  The present invention is not limited to the above embodiment. For example, the detection means is configured by the first proximity sensor 51 and the second proximity sensor 55, but may be only one of the proximity sensors. Further, the second proximity sensor 55 detects the rotation of the torque shaft 64a by entering the non-detection state, but may detect the rotation by entering the detection state. Further, the second proximity sensor 55 detects the rotation of the torque shaft 64a, but may detect the movement of other components of the lock device 60.

In addition, when one solenoid 27e of the swing cylinder electromagnetic switching valve 27 fails, the other solenoid 27s is excited so that the excitation force of both the solenoids 27e, 27s is balanced. The electromagnetic switching valve 27 may be switched to the right position in FIG. 5 by making it stronger than the excitation force of 27e. In this case, since the lock cylinder 63 contracts and the dust input box 3 can be locked again by the lock device 60, it is possible to effectively prevent the dust input box 3 from being opened.
Further, although the solenoid 27s is controlled to be excited when the solenoid 27e of the swing cylinder electromagnetic switching valve 27 fails, the solenoid 27e may be controlled to be excited when the solenoid 27s fails. In this case, for example, a proximity sensor for detecting that the dust box 3 is in the open position may be provided as the detection means. As a result, the swing cylinder 20 malfunctions (contracts) when the discharge plate 18 is moved backward by the discharge plate switch 36 and the dust is discharged in a state where the dust input box 3 is in the open position. When the proximity sensor is in the non-detection state, the swing cylinder electromagnetic switching valve 27 can be held at the neutral position as described above, so that the dust throwing box 3 can be prevented from being closed.

Moreover, although the loading apparatus T is a press type which loads dust only with the pushing plate 8, it may be a rotating plate type which loads dust with the cooperation of the pushing plate and the rotating plate. In this case, the cylinder and the motor for operating the pushing plate and the rotating plate constitute the loading drive means 71.
Further, the loading device T is configured to discharge the dust loaded in the dust container 2 by the discharge plate 18 to the outside, and discharge the dust to the outside by dumping the dust container 2. May be. In this case, the cylinder for dumping the dust storage box 2 serves as the discharge driving means.

1 Dust collection truck 2 Dust storage box 3 Dust input box 3a Input port 20 Swing cylinder (hydraulic actuator)
27 Electromagnetic switching valve for swing cylinder (three-position electromagnetic switching valve)
27e Solenoid (Solenoid for opening)
27s Solenoid (closing solenoid)
43 Loading switch (loading operation means)
47 control device 57 detection means (detection means)
63 Lock cylinder (hydraulic actuator)
71 Loading drive means 72 Loading box drive means

Claims (2)

A dust bin,
A dust input box that is connected to the dust storage box so as to be openable and closable, and has a dust input port at the rear,
Charging box drive means having a hydraulic actuator that operates by individually exciting a pair of solenoids of a three-position electromagnetic switching valve to open and close the dust charging box;
An input box operating means for outputting an operation command for exciting each solenoid of the three-position electromagnetic switching valve individually;
Detecting means for detecting that one of the pair of solenoids is excited to drive the charging box driving means;
A control device for exciting the other solenoid of the pair of solenoids when the detection means detects the drive of the input box drive means in a state where no operation command is output from the input box operation means; A garbage truck characterized by having. Loading driving means that operates when loading the dust thrown into the dust throwing box into the dust storage box;
Loading operation means for outputting an operation command for operating the loading drive means, and
The pair of solenoids of the three-position electromagnetic switching valve are energized when the input box driving means is driven to open the dust input box, and the opening solenoid is closed so as to close the dust input box. It is a closing solenoid that is excited when driving the input box drive means,
The detecting means detects that the opening solenoid is excited and the throwing box driving means is driven,
In the control device, the detection means drives the charging box driving means in a state where no operating command is output from the charging box operating means and an operating command is output from the loading operation means. The garbage truck according to claim 1, wherein the closing solenoid is energized when the detection is detected.

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