JP2021160837A - Garbage collecting vehicle - Google Patents

Abstract

To provide a garbage collecting vehicle that can open a garbage input port by automatically operating an opening/closing door even when both hands of an operator are not free.SOLUTION: A garbage collecting vehicle comprises: a garbage input box with a garbage input port opened at a rear end thereof; a garbage loading device arranged inside the garbage input box; and an opening/closing door for opening and closing the garbage input port. The garbage collecting vehicle also comprises: a foot operation switch arranged in the vicinity of the garbage input port and for instructing opening and closing operations of the opening/closing door according to a foot operation of a person; and a control device for controlling the opening and closing operations of the opening/closing door based on the instruction of the foot operation switch.SELECTED DRAWING: Figure 9

Description

The present invention relates to a garbage truck, and more particularly to a configuration for improving the efficiency of work of throwing dust into a dust inlet.

Generally, in a conventional dust collecting vehicle, for example, as disclosed in Patent Document 1, a dust loading box, a dust loading device arranged inside the dust loading box, and a rear end of the dust loading box. It is equipped with an opening / closing door that opens and closes the dust inlet that is opened in the box. A configuration is adopted in which the product is loaded into the input box. In such a garbage truck, the opening / closing door is also called a tailgate.

In such a conventional garbage truck, a handle (tailgate handle) is attached to the opening / closing door, and when collecting dust, an operator usually grasps the tailgate handle and raises the opening / closing door to raise the opening / closing door. Is opened, and in this state, the work of throwing the dust into the dust inlet is performed.

JP-A-2017-48049

However, in the conventional garbage truck, when the worker holds a bag in both hands and stands in front of the dust inlet when collecting the dust, the opening / closing door is in the lowered state and the dust inlet is closed. It may be. In such a case, the operator needs to put the dust bag that he had once on the ground, and raise the opening / closing door while grasping the tailgate handle on it to open the dust inlet, which is efficient. There was a drawback that the dust injection work could not be performed well.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to automatically operate the opening / closing door even in a situation where both hands of the operator are blocked and the tailgate handle cannot be grasped. The purpose is to provide a garbage truck capable of opening the dust inlet.

The present invention constitutes means for solving the above-mentioned problems as follows. That is, the dust collecting vehicle of the present invention has a dust loading box having a dust loading port opened at the rear end, a dust loading device arranged inside the dust loading box, and an opening / closing opening / closing of the dust loading port. In a dust collecting vehicle provided with a door, a foot operation switch which is arranged in the vicinity of the dust inlet and instructs an opening / closing operation of the opening / closing door according to a person's foot operation, and a foot operation switch for the instruction of the foot operation switch. Based on the above, the control device for controlling the opening / closing operation of the opening / closing door is provided.

In the above configuration, when the foot operation switch is operated by the foot of a person, the control device opens and closes the opening / closing door based on the instruction of the foot operation switch. Therefore, when the opening / closing door closes the dust inlet, when a person (worker) stands in front of the dust inlet with a bag in both hands, the worker has both hands blocked. Even if you cannot grasp the tailgate handle, just by operating the foot operation switch with your foot, the control device automatically operates the opening and closing door to open the dust inlet, so the operator can hold the dust bag in both hands. The dust bag can be thrown into the dust inlet without lowering one or both of them to the ground, and the efficiency of the dust loading work can be improved.

As a more specific configuration, an emergency stop operation unit operated by the person to stop the operation of the dust loading device is arranged below the dust inlet, and the foot operation switch is used for the emergency stop operation. It is preferable that the unit is arranged on the side of the portion and is arranged deeper on the inner side of the dust input box than the emergency stop operation portion.

In this configuration, the foot operation switch is located on the side of the emergency stop operation unit, so that the operator can load the dust loading device while the dust is being loaded into the dust loading box by the operation of the dust loading device. It is possible to push the emergency stop operation unit by foot operation to stop the dust loading device in an emergency without disturbing the foot operation switch even when it is about to be caught in the vehicle. In addition, since the foot operation switch is located closer to the inside of the dust input box than the emergency stop operation unit, that is, to the driver's seat side of the garbage truck, the push foot operation of the emergency stop operation unit is performed by the emergency stop operation unit. It stops at the position of, and does not reach the foot operation switch. Therefore, it is possible to effectively suppress the malfunction of the open / close door due to the foot operation of the foot operation switch accompanying the push-in foot operation of the emergency stop operation unit.

Further, it is preferable that the foot operation switch has a sensing space on the inner side of the dust input box and detects that the toes of the person have entered the sensing space.

In this configuration, the sensing space of the foot operation switch is recessed inside the dust input box, and the opening / closing operation of the opening / closing door is instructed only when the operator's toes enter this sensing space. .. Therefore, in a type of foot operation switch that does not have a sensing space, for example, a type of foot operation switch in which the operator steps on from above, the operator may accidentally operate the foot operation switch during the debris loading operation. There is a high concern that the dust that is about to be thrown into the dust inlet will hit the foot operation switch and be operated. However, with the foot operation switch that has the above-mentioned sensing space, the operator intentionally puts the toes into the sensing space. Since foot operation is required, it is possible to effectively reduce the malfunction of opening and closing the opening / closing door by mistake.

Further, the control device includes a power source switch for turning on / off the power source of the dust loading device, and the control device is a foot operation switch provided that the power source of the dust loading device is turned on by the power source switch. It is preferable that it is configured to enable.

In this configuration, the power source of the dust loading device is turned on by the power source switch, that is, the dust collecting vehicle is stopped, and then the dust is loaded into the dust loading box by the operation of the dust loading device. The foot operation switch becomes effective only when the situation is reached. Therefore, when the worker throws the dust into the dust inlet, if the worker operates the foot operation switch with his / her foot, the opening / closing door can be reliably opened. On the other hand, when the garbage truck is traveling, the foot operation switch is invalidated, so that it is possible to reliably prevent the opening / closing door from being inadvertently opened due to a malfunction of the foot operation switch during travel.

In addition, the control device includes a loading button for operating the dust loading device, and the control device operates the foot operation switch on condition that the dust loading device is operated by turning on the loading button. It is preferably configured to be disabled.

In this configuration, the operation of the foot operation switch is invalid during the operation of the dust loading device. When the dust loading device is operating, that is, when the operator is loading dust with the dust inlet open, the foot operation switch is invalid even if the foot operation switch is accidentally operated. Therefore, the opening / closing door does not inadvertently close, and it is possible to prevent the operator from being confused with the dust loading work.

Further, the control device controls the opening / closing door so as to close the dust inlet and invalidates the foot operation switch, provided that the power source of the dust loading device is turned off by the power source switch. It is preferable that it is configured to be.

In this configuration, after the power source of the dust loading device is turned off by the power source switch, that is, after the dust loading work into the dust loading box is completed, the dust loading port is closed by the opening / closing door and the dust loading port is closed. The foot control switch is disabled. Therefore, even if the garbage truck runs after the dust loading work is completed, it is surely prevented from running with the dust inlet open, and foreign matter on the road that the rear wheels wind up during the running prevents the garbage truck from running. It is possible to prevent the foot operation switch from malfunctioning and prevent the opening / closing door from being inadvertently opened.

It is a side view which shows the garbage truck which concerns on embodiment of this invention. It is a rear view of the garbage truck of FIG. It is explanatory drawing of the operation of the dust loading device equipped in the garbage truck. It is a figure which shows the hydraulic circuit of the dust loading device. It is a perspective view of the foot switch arranged around the dust inlet of the garbage truck. It is a side view of the inside of the garbage input box provided in the garbage truck. It is a figure which shows the hydraulic circuit of the tailgate of a dust input box. It is a flowchart which shows the control procedure of the control device which controls the hydraulic circuit of FIG. It is a perspective view explaining how the operator foot-operates a foot switch in the garbage truck of FIG.

An embodiment in which the present invention is applied to a rotary garbage truck will be described with reference to the drawings. In the following description, for convenience, the front, rear, left, and right of the garbage truck may be simply referred to as "front, back, left, and right."

1 and 2 show a garbage truck 100 according to an embodiment of the present invention. In the garbage truck 100, a dust storage box 2 and a dust storage box 3 are provided on the chassis 1, and an opening at the rear of the dust storage box 2 and an opening at the front of the dust storage box 3 are communicated with each other. There is. Further, the dust input box 3 is pivotally supported with respect to the dust storage box 2 by a pivot axis 3a in the left-right direction provided on the upper portion thereof, and is tilted by a pair of left-right tilt cylinders (not shown). There is.

Further, a substantially rectangular dust input port 4 for charging dust G (see FIG. 9) is opened at a lower portion on the back surface of the dust input box 3, and a tailgate (opening / closing door) 5 that can be raised and lowered 5 The dust inlet 4 is opened and closed. In the following description, the operation of opening the dust input port 4 by the ascending operation of the tailgate 5 is referred to as the opening operation of the tailgate 5, and the operation of closing the dust input port 4 by the descending operation of the tailgate 5 is referred to as the opening operation of the tailgate 5. It is called closing operation. The tailgate handle 49 is attached to the tailgate 5 on the left side and the right side of the central portion in the left-right direction, respectively. The operator H (see FIG. 9) can manually open and close the tailgate 5 by grasping the tailgate handle 49 and moving the tailgate 5 up and down.

Further, on the left side of the dust input port 4, a switch box 6 for operations such as driving of a dust loading device (described later) 8 is provided. Further, above the dust inlet 4, a camera unit 7 provided with a camera 71 is arranged so as to photograph the dust inlet 4 and the area in the vicinity thereof. As the camera 71, for example, a monocular camera having a proven track record as a back-eye camera is used. The camera unit 7 is placed on the upper part of the dust input box 3 via a support member 72 that protrudes rearward from the inclined rear surface portion (curved rear surface portion) of the dust input box 3 arranged above the dust input port 4. It is fixed.

Next, as shown in FIG. 3, the dust loading box 3 is equipped with a dust loading device 8 for loading the charged dust G into the dust storage box 2. The dust loading device 8 pushes the dust G thrown into the dust loading box 3 into the dust storage box 2 continuously provided in front of the dust loading box 3. The dust storage box 2 is provided with a dust discharge device (not shown) for discharging the stored dust G. As the dust storage box, for example, the dust storage box 2 is tilted by a dump cylinder interposed between the chassis 1 and the dust storage box 2 to discharge the dust G, or is provided inside the dust storage box 2. It is conceivable that the waste discharge plate is moved to the rear of the dust storage box 2 by the discharge cylinder to discharge the dust G.

-Structure of dust loading device 8-
Next, the configuration of the dust loading device 8 of the present embodiment will be specifically described. The dust loading device 8 of the present embodiment is a so-called rotary dust loading device in which the dust G is scraped up by the rotation of the rotating plate 10 as the loading plate and pushed into the dust storage box 2 by the pushing plate 20. It is configured as. Inside the dust input box 3, a rotating shaft 11 arranged below the push-in plate 20 so as to extend in the width direction of the dust input box 3 is erected, and the base end side of the rotating plate 10 is fixed to the rotating shaft 11. The rotating plate 10 is rotatable about its base end (rotating shaft 11).

In the illustrated example, a hydraulic motor 13 capable of forward / reverse rotation is connected to the end of the rotating shaft 11 via a speed reduction mechanism 12. The rotation of the hydraulic motor 13 is torqued up by the speed reduction mechanism 12 and transmitted to the rotating shaft 11, and the rotating plate 10 is rotated integrally with the rotating shaft 11, so that the tip portion thereof has a substantially semi-arc shape in cross section. It moves in the front-rear direction along the inner bottom portion 3c of the formed dust input box 3.

On the other hand, the push-in plate 20 is provided above the rotary plate 10 over the entire width direction of the dust input box 3, and is rotatable in the front-rear direction around the left-right rotation shaft 21 provided above the push-in plate 20. It is supported. Further, the push plate 20 is provided with an extension portion 22 extending upward from the rotation shaft 21, and a push cylinder 24 is erected between the extension portion 22 and the support pin 23 in front of the extension portion 22. The push-in plate 20 is rotated in the front-rear direction by the expansion / contraction operation.

Specifically, as shown by the solid line in FIG. 3, when the push-in plate 20 is in the most rotated position (advance limit position) toward the dust storage box 2, interference with the push-in plate 20 is avoided. While doing so, the avoidance rotation step of rotating the rotating plate 10 backward is performed. Then, the push-in plate 20 rotates toward the dust input port 4 side behind the backward rotation of the rotary plate 10, and the position (backward limit position) shown by a virtual line in FIG. 3 most rotated toward the dust input port 4 side. Perform a return process that stops at. After that, the rotary plate 10 rotates downward following the avoidance rotation step, and then rotates forward so as to scrape the dust G toward the dust storage box 2 along the inner bottom portion 3c of the dust input box 3. A scraping rotation step of rotating and further rotating upward and temporarily stopping at a set stop position extending to the front dust storage box 2 side is performed, as shown by a solid line in FIG. After that, the push-in plate 20 rotates toward the front dust storage box 2 to push the dust G on the rotary plate 10 into the dust storage box 2, and the pushing step of reaching the forward limit position is performed again.

In this way, the rotary plate 10 and the push plate 20 rotate the rotary plate 10 and the push plate 20 with the four steps of the avoidance rotation step, the return step, the scraping rotation step, and the push step as one cycle. By repeating the process in synchronization with each other, the dust loading operation in which the dust G thrown into the dust loading box 3 is continuously loaded into the dust storage box 2 is performed.

Inside the dust input box 3, switches LS1 to LS4 for detecting the positions of the rotating plate 10 and the pushing plate 20 are provided. Specifically, as shown in FIG. 3, the switches LS1 and LS2, which are turned on when the push plate 20 is in the forward limit position or the reverse limit position, and the switches LS1 and LS2, which are turned on when the rotary plate 10 is in the set stop position, are turned on. Switch LS3 and switch LS4 that turn on when the rotating plate 10 rotates in a positive direction (clockwise in FIG. 3) by a predetermined angle from the set stop position and turn off when the rotating plate 10 further rotates by a predetermined angle. Has been done.

The switches LS1 and LS2 are designed to detect a dog (not shown) provided at the end of the rotation shaft 21 of the push plate 20, and the switches LS3 to LS4 are the rotation shafts 11 of the rotation plate 10. A dog (not shown) provided at the end of the is detected. Further, as these switches LS1 to LS4, for example, a limit switch, a photoelectric switch, a proximity switch and the like can be used. Further, in the switch LS4, as shown by hatching in FIG. 3, the rotating plate 10 descends while rotating backward from directly below the leading edge portion (upper edge portion) 4a of the dust input port 4, and the dust input port 4 It detects the angle range Z until it is closest to the trailing edge (lower edge) 4b, and is a sensor for detecting that the rotating plate 10 is operating in the vicinity of the dust inlet 4. ..

-Operating system of the dust loading device 8-
Next, the operation system of the dust loading device 8 will be described with reference to FIG. This operating system outputs control signals to the hydraulic motor 13 of the dust loading device 8, the hydraulic circuit that controls the hydraulic pressure supplied to the push cylinder 24, and the electromagnetic control valves V1 and V2 provided in the hydraulic circuit. It includes a control device 80. Signals of the four switches LS1 to LS4 and the switch SW1 for the emergency stop plate (emergency stop operation unit) 62 are input to the control device 80 (not shown). The control device 80 controls not only the drive of the dust loading device 8 but also the drive of the dust discharge device.

The hydraulic circuit will be described with reference to FIG. This hydraulic circuit includes a hydraulic pump P, an oil reservoir T, an electromagnetic control valve V1 for controlling the push cylinder 24, and an electromagnetic control valve V2 for controlling the hydraulic motor 13. The driving force is transmitted to the hydraulic pump P by a PTO (Power Take Off) that takes out the power of an engine (not shown) as a vehicle traveling drive source.

As an example, the electromagnetic control valves V1 and V2 are each composed of an electromagnetic directional control valve having 6 ports and 3 positions. When the solenoid SOLa is excited by the control device 80, the electromagnetic control valve V1 switches to the first communication position (upper position in FIG. 4), and the hydraulic oil from the hydraulic pump P is introduced into the rod-side oil chamber of the pair of push cylinders 24. Supply to. On the other hand, when the solenoid SOLb is excited by the control device 80, the electromagnetic control valve V1 switches to the second communication position (lower position in FIG. 4) and supplies hydraulic oil to the oil chamber on the head side.

Then, when the hydraulic oil is supplied from the electromagnetic control valve V1 to the oil chamber on the head side, the pair of push cylinders 24 extend and rotate the push plate 20 forward. On the other hand, when the hydraulic oil is supplied to the oil chamber on the rod side, the pair of push cylinders 24 contract and rotate the push plate 20 rearward. Further, when neither of the solenoids SOLa and SOLb is excited, the electromagnetic control valve V1 returns to the neutral position (center position in FIG. 4).

When the solenoid SOLc is excited, the electromagnetic control valve V2 switches to the first communication position (lower position in FIG. 4), supplies hydraulic oil to the oil chamber on the forward rotation side of the hydraulic motor 13, and corrects the hydraulic motor 13. In addition to rolling, the push cylinder 24 can also be expanded and contracted. On the other hand, when the solenoid SOLd is excited, the electromagnetic control valve V2 switches to the second communication position (upper position in FIG. 4), supplies hydraulic oil to the oil chamber on the reversing side of the hydraulic motor 13, and reverses the hydraulic motor 13. Activate.

Further, when neither of the solenoids SOLc and SOLd is excited, the electromagnetic control valve V2 returns to the neutral position (center position in FIG. 4). When both the electromagnetic control valves V1 and V2 are in the neutral position, the hydraulic oil returns to the oil reservoir T. In the illustrated hydraulic circuit, reference numeral V3 is a check valve, and reference numeral V4 is a relief valve for setting an upper limit of the discharge pressure of the hydraulic pump P.

When the emergency stop plate 62 is pushed, the control device 80 receives a signal from the switch SW1 and returns the electromagnetic control valves V1 and V2 to the neutral positions (center positions in FIG. 4), thereby causing hydraulic pressure. The supply of hydraulic oil to the motor 13 and the pair of push cylinders 24 is stopped, the operations of the hydraulic motor 13 and the pair of push cylinders 24 are stopped, and the rotary plate 10 and the push plate 20 of the dust loading device 8 are stopped. Emergency stop the operation of.

-Button operation system-
Further, as shown in FIGS. 1 to 3, in the vicinity of the dust input port 4, emergency stop buttons 60 and 61 for stopping the drive of the dust loading device 8 and an emergency stop plate (emergency stop operation unit) are provided. 62 and the like are arranged. As shown in FIG. 1, an emergency stop button 60 is arranged on the side surface of the switch box 6 provided on the left side of the dust inlet 4, and as shown by a broken line in FIG. 3, on the right side of the dust inlet 4. An emergency stop button 61 is provided.

The emergency stop plate 62 is formed in a wide-area square shape extending from the central portion in the vehicle width direction to the left and right just below the dust input port 4 when the dust input box 3 is viewed from the rear. Therefore, the switch SW1 is arranged so as to be pushed to the front side (the dust input box 3 side) by the manual operation or the foot operation of the operator H to turn on the switch SW1.

Further, as shown in FIG. 1, a PTO switch 63 and a loading / discharging changeover switch 64 are arranged on the operation panel 9 arranged around the driver's seat of the garbage truck 100. When the PTO switch (power source switch) 63 is turned on, the hydraulic pump P (see FIG. 4) as the power source of the dust loading device 8 and the engine are connected by PTO (Power Take Off). .. Further, the loading / discharging changeover switch 64 switches between the dust loading operation of the dust loading device 8 and the dust discharging operation of the dust discharging device.

In addition, as shown in FIG. 2, a loading button 65 is arranged on the rear surface of the switch box 6. The loading button 65 is operated when instructing the control device 80 to perform the dust loading operation of the dust loading device 8 in the connected state of the PTO. The loading button 65 may be in the button type or the toggle switch type.

Although not shown, the switch box 6 is also provided with a single-acting or continuous selection switch for dust loading operation, a switch for operating the rotating plate 10 and the pushing plate 20 independently, and the like.

-Foot switch-
Then, as shown in FIG. 2, in the vicinity of the dust input port 4, the dust G on the pedestrian road or the like, which is on the left side of the emergency stop plate 62, that is, on the same side as the switch box 6 on the left and right sides, is present. On the side where it is placed, a foot switch 30 is arranged as a foot operation switch. As shown in FIG. 5, the foot switch 30 includes a wall surface 30a facing the rear side of the dust collecting vehicle 100 and a square pillar-shaped sensing space 30b recessed from the wall surface 30a to the inside of the dust input box 3. , A pair (two) of sensor units 30c (only one sensor unit is shown) that transmits and receives far infrared rays and the like in the horizontal direction on the left and right wall surfaces facing each other among the plurality of wall surfaces forming the sensing space 30b. ing. The sensing space 30b is a space in which the toes can be inserted by the operator H as shown in FIG. The volume of this space is set to such a volume that the toes of the general size of the worker H can be accommodated. Then, when the toes of the worker H enter the sensing space 30b, the far infrared rays and the like transmitted and received by the pair of sensor units 30c are blocked by the toes of the worker H, so that the foot switch 30 Is a configuration that detects that the toes of the worker H have entered the sensing space 30b and outputs a sensing signal.

As shown in FIG. 9, the foot switch 30 is positioned so that the wall surface 30a is recessed from the position of the emergency stop plate 62 on the dust input box 3 side by a predetermined distance t (for example, about 5 cm to 15 cm). Has been done.

In the foot switch 30 shown in FIG. 5, a pair of sensor units 30c are provided on the left and right wall surfaces facing each other among the plurality of wall surfaces forming the sensing space 30b, but in addition, a plurality of wall surfaces forming the sensing space 30b. A pair of sensor units 30c may be arranged on the upper and lower wall surfaces of the sensor units 30c so as to transmit and receive far infrared rays and the like in the vertical direction.

-Opening and closing mechanism of tailgate 5-
Next, an opening / closing mechanism for opening / closing the tailgate 5 will be described. As shown in FIG. 6, a cover 3b is provided on the upper part of the rear surface of the dust input box 3. Further, guide rails 40 are provided from the upper ends to the lower ends on both the left and right sides of the dust input port 4. The guide rail 40 is formed, for example, having a concave cross section (that is, a groove shape). Guides 41 that move along the guide rail 40 are provided on both sides of the lower end of the tailgate 5. The guide 41 is composed of rollers and is provided so as to be movable in the groove of the guide rail 40. Further, connecting shafts 42 projecting in the left-right direction and connected to the opening / closing arm 43 are provided on both sides of the upper end of the tailgate 5.

An edge portion 3e is provided on each of the leading edge portions of the dust input box 3. A support portion 44 is provided on the edge portion 3e. The support portion 44 rotatably supports the base end portion of the opening / closing arm 43. The tip of the opening / closing arm 43 is rotatably connected to the side of the tailgate 5. The opening / closing arm 43 is formed to be bent in order to avoid interference with each part. A reinforcing plate 43a for reducing the bending stress of the bent portion is fixed to the bent portion of the opening / closing arm 43. Although the opening / closing arm 43 is bent, the shape of the opening / closing arm 43 is not particularly limited.

As shown in FIG. 6, the opening / closing arm 43 is configured to be rotatable. The rotation of the opening / closing arm 43 is performed by the expansion / contraction operation of the hydraulic cylinder 45. A pair of left and right hydraulic cylinders 45 are provided. The hydraulic cylinder 45 includes a cylinder rod 45a, a cylinder tube 45b, and a piston 45c (see FIG. 7) provided at one end of the cylinder rod 45a. The details will be described below. A connecting portion 46 is attached to the base end portion of the opening / closing arm 43. One end of the cylinder rod 45a of the hydraulic cylinder 45 is connected to the connecting portion 46. The cylinder tube 45b of the hydraulic cylinder 45 is attached to the edge portion 3e. The dust input box 3 is provided with an urging member 47 along the side wall 3d. The urging member 47 is, for example, a tension coil spring. One end of the urging member 47 is hooked on the opening / closing arm 43, and the other end of the urging member 47 is hooked at a predetermined position on the side wall 3d. As a result, the opening / closing arm 43 is urged in a direction of upward rotation by the urging force of the urging member 47. A tension adjusting mechanism 48 is connected to the urging member 47. The tension adjusting mechanism 48 is for adjusting the amount of bending of the urging member 47.

In the above configuration, when the tailgate 5 is changed from the fully closed state to the fully open state, the hydraulic cylinder 45 is extended. As a result, the force pushing up the connecting portion 46 acts on the connecting portion 46, so that the opening / closing arm 43 rotates counterclockwise in FIG. 6 around the fulcrum of the supporting portion 44. Along with this, the tailgate 5 connected to the opening / closing arm 43 moves up and is housed in a position below the cover 3b. As a result, the dust input port 4 is fully opened.

On the other hand, when the tailgate 5 is changed from the fully open state to the fully closed state, the hydraulic cylinder 45 is contracted. As a result, the force pushing down the connecting portion 46 acts on the connecting portion 46, so that the opening / closing arm 43 rotates clockwise in FIG. 6 around the fulcrum of the supporting portion 44. Along with this, the tailgate 5 moves downward. As a result, the dust input port 4 is fully closed. The tailgate 5 is opened and closed by the above method.

-Flood circuit of tailgate 5-
Next, the operation of the tailgate 5, that is, the hydraulic circuit that controls the operation of the hydraulic cylinder 45 (see FIG. 6) will be described. As shown in FIG. 7, the dust input box 3 according to the present embodiment is provided with an electric hydraulic pump unit 50 different from the power source (hydraulic pump P) of the dust loading device 8. The electric hydraulic pump unit 50 includes an electric motor 50a, a reservoir tank 50b, a hydraulic pump 50c connected to the electric motor 50a, a check valve 50d, a discharge port 50e, a suction port 50f, a relief valve 50g, and the like. It has. When the hydraulic pump 50c is driven by the electric motor 50a, the hydraulic oil in the reservoir tank 50b is sucked up by the hydraulic pump 50c, passes through the check valve 50d, and is discharged from the discharge port 50e. A relief valve 50 g and a pressure gauge 51 are connected to a pipeline on the discharge side of the hydraulic pump 50c. The discharge port 50e is connected to one port of the first switching valve 53, which is a so-called 4-port 3-position electromagnetic switching valve. The suction port 50f is connected to the other port of the first switching valve 53. The second switching valve 54 and the third switching valve 55, which are electromagnetic switching valves at two positions of two ports, are connected to the other two ports (ports on the upper side of the drawing) of the first switching valve 53, respectively. These switching valves 54 and 55 are poppet-type electromagnetic switching valves, and have an advantage that there is little internal leakage of hydraulic oil.

FIG. 7 shows a pair of left and right hydraulic cylinders 45. The hydraulic cylinder 45 includes a rod-side port 45d provided on the cylinder rod 45a side and a head-side port 45e provided on the cylinder head (piston 45c) side. The second switching valve 54 and the rod side port 45d are connected to each other via a one-way throttle valve 56 arranged so as to allow flow to the hydraulic cylinder 45 side. Further, the third switching valve 55 and the head side port 45e are connected to each other via a one-way throttle valve 57 arranged so as to allow flow to the hydraulic cylinder 45 side.

The hydraulic circuit of FIG. 7 is provided with a pressure oil releasing means 70 for allowing the pressure oil on the head side and the rod side of the hydraulic cylinders 45 and 45 to be released at any time. The pressure oil releasing means 70 includes an erection pipe 52a, a first on-off valve 58a, a second on-off valve 58b, a drain pipe 52b, and a tank 59 connected to the end of the drain pipe 52b. The erection pipe 52a is connected to the rod side port 45d and the head side port 45e of the hydraulic cylinders 45 and 45. The first on-off valve 58a is provided in the erection pipe 52a. The drain pipe 52b is connected to the rod side port 45d of the hydraulic cylinders 45 and 45. The second on-off valve 58b is provided in the drain pipe 52b. In such a configuration, by opening the first on-off valve 58a and the second on-off valve 58b, respectively, the pressure oil on the head side and the rod side of the hydraulic cylinders 45 and 45 is released from the inside of the hydraulic cylinder 45. It has become like. As a result, the flood pressure by the hydraulic cylinders 45 and 45 is released, and the tailgate 5 can be easily moved up and down by a manual operation of gripping the tailgate handle 49. The pressure oil releasing means 70 may be any as long as it releases the pressure of the hydraulic oil on the head side and the rod side of the hydraulic cylinders 45 and 45 so that the cylinder rod 45a can be freely moved. It is not limited to the configuration.

Next, the switching operation of each valve when the hydraulic cylinders 45 and 45 are expanded and contracted will be described. First, when the hydraulic cylinder 45 is extended, the first on-off valve 58a and the second on-off valve 58b are closed to drive the electric motor 50a. Then, the flow path in the first switching valve 53 is switched to the left position a, the flow path in the second switching valve 54 is switched to the right position b, and the flow path in the third switching valve 55 is held in the left position a. .. As a result, the hydraulic oil is supplied from the discharge port 50e to the head side port 45e of the hydraulic cylinders 45 and 45, and the hydraulic oil is returned to the suction port 50f from the rod side port 45d of the hydraulic cylinders 45 and 45. As a result, the cylinder rod 45a moves in the direction in which the hydraulic cylinder 45 extends. As a result, the tailgate 5 rises and the dust input port 4 is fully opened.

When the movement of the cylinder rod 45a is stopped when the hydraulic cylinder 45 is extended, the flow path in the first switching valve 53 is switched to the neutral position c from the above state, and the flow in the second switching valve 54 is stopped. Switch the road to the left position a. As a result, the supply of hydraulic oil to the head-side port 45e is stopped, and the escape paths for the hydraulic oil in the rod-side port 45d and the head-side port 45e are closed. As a result, the cylinder rod 45a stops moving and maintains the stopped state. By holding the second switching valve 54 and the third switching valve 55 at the left position a, respectively, internal leakage is reduced, and the hydraulic cylinder 45 is prevented from contracting and the tailgate 5 is prevented from descending. NS.

On the other hand, when the hydraulic cylinder 45 is contracted, the flow path in the first switching valve 53 is switched to the right position b from the above-mentioned stopped state, and the flow path in the second switching valve 54 is held in the left position a. , The flow path in the third switching valve 55 is switched to the right position b. As a result, the hydraulic oil is supplied from the discharge port 50e to the rod side port 45d, and the hydraulic oil is returned from the head side port 45e to the suction port 50f. As a result, the cylinder rod 45a moves in the direction in which the hydraulic cylinder 45 contracts. As a result, the tailgate 5 descends and the dust inlet 4 is fully closed.

When the movement of the cylinder rod 45a is stopped when the hydraulic cylinder 45 is contracted, the flow path in the first switching valve 53 is switched to the neutral position c from the above state, and the flow in the third switching valve 55 is stopped. Switch the road to the left position a. As a result, the supply of hydraulic oil to the rod-side port 45d is stopped, and the escape paths for the hydraulic oil in the rod-side port 45d and the head-side port 45e are closed. As a result, the cylinder rod 45a stops moving and maintains the stopped state. The rotation operation of the electric motor 50a, the switching operation of the first switching valve 53, the switching operation of the second switching valve 54, and the switching operation of the third switching valve 55 are controlled by the control device 80 having a CPU (Central Processing Unit). Will be done. The detection signal of the foot switch 30 is input to the control device 80, and the operation signals of the PTO switch 63, the loading / discharging changeover switch 64, and the loading button 65 are also input to the control device 80. In the present embodiment, the control device 80 controls the switching operation of each of the valves to raise or lower the tailgate 5 to fully open or fully close the dust inlet 4.

-Open / close control of tailgate 5-
Next, the opening / closing control of the tailgate 5 based on the foot switch 30 will be described with reference to the flowchart of FIG.

In the figure, in step S1, the control device 80 determines whether or not the PTO (Power Take Off) that transmits the engine power to the hydraulic pump P (see FIG. 4) of the dust loading device 8 is in the ON state. Specifically, this determination is made based on whether or not the PTO switch 63 that operates the PTO is turned on. The PTO switch (power source switch) 63 (see FIG. 1) is provided by the worker H before the garbage truck 100 is stopped and the worker H throws the dust G into the dust input box 3 in this stopped state. It is turned on.

If the PTO is not in the on state in step S1, it waits as it is, but if the PTO is in the on state, the process proceeds to step S2. In step S2, the control device 80 further determines whether the loading / discharging selector switch 64 is set (switched) on the loading side, and when it is set on the loading side, that is, the dust in the dust loading box 3. When the dust is thrown into the throwing port 4, it is determined in step S3 whether the loading button 65 is turned on. Then, when the loading button 65 has not yet been turned on, that is, when the dust loading device 8 is stopped and the tailgate 5 also closes the dust loading port 4, the control device only proceeds to step S4. 80 activates the foot switch 30 and proceeds to step S5.

In step S5, the control device 80 determines whether or not the foot switch 30 is in the ON state, that is, whether or not the worker H puts his or her foot in the sensing space 30b and outputs a sensing signal, and the foot switch 30 determines whether or not the sensing signal is output. If it is still in the off state, the process immediately proceeds to step S8 without operating the tailgate 5, but if the foot switch 30 is in the on state, it is determined that the operator H has instructed the opening / closing operation of the tailgate 5. Then, the process proceeds to step S6. In step S6, the control device 80 determines whether or not the tailgate 5 is in the fully closed state, and if it is in the fully closed state, raises the tailgate 5 in step S7 to bring the dust inlet 4 into the fully open state. .. After that, the process proceeds to step S8, and the control device 80 again determines whether or not the PTO is in the ON state, and if the PTO is in the ON state, returns to step S2.

Then, when the loading button 65 is turned on in step S3 after the tailgate 5 is raised and the dust input port 4 is fully opened by the foot operation of the foot switch 30 by the operator H as described above. That is, when operating the dust loading device 8, the control device 80 operates the dust loading device 8 for one cycle in step S9. As a result, the dust loading operation of loading the dust G thrown into the dust charging port 4 into the dust storage box 2 is performed. Then, during the dust loading operation in this way, the control device 80 disables the foot switch 30 in step S10 so as to prohibit the careless operation of the tailgate 5. That is, even if the detection signal is output from the foot switch 30, the control device 80 ignores the detection signal. After step S10, the process proceeds to step S8, and the control device 80 determines whether or not the PTO is in the off state, and if it is in the on state, returns to step S2.

When the loading operation of the dust G is temporarily suspended or terminated, the loading button 65 is no longer turned on, and the dust loading device 8 is also not operated. In this state, the tailgate 5 is fully opened because the dust G has been loaded until just before, or the tailgate 5 is half-opened by a manual operation by the worker H during the loading operation. In this case, when the foot switch 30 is turned on again (YES in step S5 and YES in step S6), the process proceeds to step S11, the control device 80 determines whether the tailgate 5 is in the fully open state, and the tailgate 5 is in the fully open state. If not, the tailgate 5 is raised to fully open the dust inlet 4 in step S7, but when the tailgate 5 is fully open, the worker H finishes loading the dust G. In step S12, the tailgate 5 is lowered to fully close the dust inlet 4, and then the process proceeds to step S8.

On the other hand, when the loading / discharging changeover switch 64 is set (switched) to the discharge side in step S2, that is, when the dust in the dust storage box 2 is discharged to the outside of the dust collecting vehicle 100, in step S13. , The foot switch 30 is disabled so as to prohibit the careless opening / closing operation of the tailgate 5, and then the process proceeds to step S8.

Then, in step S8, when the PTO is turned off, that is, after the work of loading the dust G into the dust input box 3 and the work of discharging the dust from the dust storage box 2 are completed, the control device 80 In step S14, the tailgate 5 is lowered to fully close the dust input port 4, and then, in step S15, the foot switch 30 is disabled, and the process ends. In step S14, the tailgate 5 is lowered to fully close the dust inlet 4, so that the worker H operates the foot switch 30 to close the tailgate 5 at the end of the dust G loading operation. Even if it is not allowed to run, the dust input port 4 can be automatically closed when the dust collecting vehicle 100 is driven.

Therefore, in the present embodiment, as shown in FIG. 9, in the garbage truck 100, the worker H is in front of the dust input port 4 in a state where the dust input port 4 is fully closed by the tailgate 5. By standing and performing a foot operation to put the tip of the foot into the sensing space 30b of the foot switch 30, the foot switch 30 outputs a sensing signal and is turned on. In response to this sensing signal, the control device 80 extends the hydraulic cylinder 45 to raise the tailgate 5 and fully opens the dust inlet 4. Therefore, even when the operator H holds the dust bag (dust bag in FIG. 9) G in both hands and both hands are closed, the foot switch 30 is operated without grasping the tailgate handle 49 by hand. Therefore, the dust inlet 4 can be fully opened and the dust G can be charged into the dust inlet 4 without lowering one or both of the dust G to the ground. Therefore, it is possible to improve the efficiency of the loading work of the dust G.

Further, in the present embodiment, in the dust collecting vehicle 100, an emergency stop plate 62 is arranged below the dust input port 4 so as to extend in the left-right direction, and the rotating plate 10 is located in the vicinity of the dust input port 4 in the dust input box 3. When the hand or arm of the worker H enters the angle range Z operating in, the worker H is likely to be caught in the rotating plate 10, but when the worker H pushes the emergency stop plate 62 with his or her feet or the like, the worker H is likely to be caught in the rotating plate 10. , The operation of the dust loading device 8 is urgently stopped by the control device 80. The foot switch 30 is arranged at a position on the left side of the emergency stop plate 62. Therefore, when the foot of the emergency stop plate 62 is operated, the foot switch 30 does not get in the way, and the worker H can quickly stop the dust loading device 8 in an emergency.

Further, the foot switch 30 is arranged behind the emergency stop plate 62 by a predetermined distance t on the inner side (that is, the driver's seat side) of the dust input box 3. Therefore, when the worker H pushes the emergency stop plate 62 by foot operation, the foot operation stops at the position of the emergency stop plate 62, and the foot operated foot is in the sensing space 30b of the foot switch 30. Since the possibility of accidentally entering can be reduced, it is possible to effectively prevent the malfunction of the foot switch 30 and reduce the possibility of the tailgate 5 descending when the dust loading device 8 is stopped in an emergency. ..

Further, the foot switch 30 has a sensing space 30b on the inner side of the dust input box 3, and has a configuration for detecting that the toes of the worker H have entered the sensing space 30b. That is, the foot switch 30 is configured to give an instruction to open and close the tailgate 5 for the first time when the operator H consciously performs a foot operation to put the tip of the foot into the sensing space 30b. Therefore, in a type of foot switch that does not have a sensing space, for example, a type of foot switch in which the worker H steps on from above, the worker H accidentally steps on the foot switch during the loading operation of the dust G. There is a high concern that the dust G that is to be operated or that is to be thrown into the dust inlet 4 will hit the foot switch 30 and be operated. However, in the foot switch 30 having the sensing space 30b of the present embodiment, there is such a concern. It is possible to effectively reduce the accidental ascending or descending operation of the tailgate 5.

In addition, the dust collecting vehicle 100 is provided with a PTO switch (power source switch) 63, and the control device 80 is turned on by turning on the PTO switch 63 to turn on the power source (hydraulic pump P) of the dust loading device 8. The foot switch 30 is configured to be enabled on condition that the PTO is in the connected state. That is, the foot switch 30 becomes effective only when the garbage truck 100 is stopped and the dust loading device 8 can be operated by the PTO. Therefore, when the worker H fully opens the dust loading port 4 in order to load the dust G into the dust loading box 3, the tailgate 5 can be reliably raised by operating the foot of the foot switch 30. .. Moreover, when the PTO switch 63 is turned off, that is, when the dust collecting vehicle 100 is traveling, the foot switch 30 is invalidated. Therefore, when the dust collecting vehicle 100 is traveling, the tailgate 5 carelessly rises and the dust input port is opened. It is possible to effectively prevent the 4 from opening.

Further, the garbage truck 100 is provided with a loading button 65, and the control device 80 disables the foot switch 30 on condition that the dust loading device 8 is operated by the on operation of the loading button 65. It is configured to. Therefore, by operating the loading button 65, the foot switch 30 is invalidated in the situation where the dust loading device 8 is operating with the dust loading port 4 open, so that the foot switch 30 is mistakenly used. Even if the foot is operated, the tailgate 5 does not inadvertently lower, and it is possible to prevent the operator H from confusing the loading operation of the dust G.

Further, the control device 80 sets the dust input port 4 on the condition that the power source (hydraulic pump P) of the dust loading device 8 is turned off (the PTO is in the disconnected state) by the off operation of the PTO switch 63. The tailgate 5 is controlled to be lowered so as to be fully closed, and the foot switch 30 is disabled. Therefore, after the work of loading the dust G into the dust loading box 3 is completed, the dust loading port 4 is fully closed by the tailgate 5 and the foot switch 30 is disabled, so that the dust loading is performed. Even if the dust collecting vehicle 100 starts to run after the work is completed, it is surely prevented from running with the dust input port 4 open, and foreign matter or the like on the road that the rear wheels wind up during running is a foot switch 30. It is possible to prevent the tailgate 5 from entering the sensing space 30b and malfunctioning, and effectively prevent the tailgate 5 from inadvertently ascending.

-Other embodiments-
The embodiments disclosed this time are examples in all respects and do not serve as a basis for limited interpretation. The technical scope of the present invention is not construed solely by the embodiments described above, but is defined based on the description of the claims. In addition, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the claims.

In the above embodiment, the foot switch 30 is arranged on the left side of the emergency stop plate 62, but instead of this arrangement, the foot switch 30 is arranged on the right side of the emergency stop plate 62, or the foot switch 30 is arranged on both the left side and the right side. May be placed.

Further, in the above-described embodiment, the foot switch 30 having the sensing space 30b is used, but other types of foot switches having no sensing space may be used.

Further, in the above-described embodiment, the hydraulic pump P, which is the power source of the dust loading device 8, is configured so that the engine power is transmitted via the PTO, and the tailgate 5 is raised and lowered. The hydraulic cylinder 45 is configured to be driven by an electric hydraulic pump unit 50 different from the hydraulic pump P, but is not limited thereto. For example, the hydraulic oil may be sent from the hydraulic pump P, which is the power source of the dust loading device 8, to the hydraulic cylinder 45 for operating the tailgate 5.

Further, as a configuration for raising and lowering the tailgate 5, a hydraulic opening / closing mechanism in which the opening / closing arm 43 is operated by a hydraulic cylinder 45 is used, but the present invention is not limited to this, and the opening / closing arm 43 is directly operated by a motor. It may be an opening / closing mechanism of the type.

In addition, in the above-described embodiment, the dust loading device 8 is composed of a rotating plate type dust loading device having a rotating plate 10 and a pushing plate 20, but is not limited to this, and is not limited to the sliding plate. , A so-called press-type dust loading device having a compression plate at the lower end of the sliding plate may be used.

Further, in the above embodiment, the power source of the dust loading device 8 is the hydraulic pump P, and the power of the engine is transmitted to the hydraulic pump P via the PTO, but the present invention is not limited to this. For example, the present invention is also applicable to a so-called electric dust collecting vehicle in which a hydraulic pump P is driven by an electric motor.

Further, in the above-described embodiment, the control device 80 is used for the operation control of the dust loading device 8, and the control device 80 is also used for opening / closing control of the tailgate 5. A separate control device may be used for each of the opening / closing control of the tailgate 5 and the opening / closing control of the tailgate 5.

Further, in the above-described embodiment, the emergency stop plate 62 as the emergency stop operation unit is formed in a wide area square shape, but the shape of the emergency stop operation unit is not limited to this, and is, for example, a rod shape. It may be formed.

The present invention can be used for a garbage truck provided with a dust loading device arranged inside the dust loading box and an opening / closing door for opening and closing the dust loading port opened at the rear end of the dust loading box. ..

2 Dust storage box 3 Dust input box 4 Dust input port 5 Tailgate (opening / closing door)
8 Dust loading device G Dust 30 Foot switch (foot operation switch)
30b Sensing space 62 Emergency stop plate (emergency stop operation unit)
63 PTO switch (power source switch)
64 Loading / discharging selector switch 65 Loading button 80 Control device 100 Garbage truck

Claims (6)

In a garbage truck equipped with a dust input box having a dust input port opened at the rear end, a dust loading device arranged inside the dust input box, and an opening / closing door for opening and closing the dust input port. ,
A foot operation switch that is arranged near the dust inlet and instructs the opening / closing operation of the opening / closing door in response to a person's foot operation.
A garbage truck including a control device for controlling the opening / closing operation of the opening / closing door based on the instruction of the foot operation switch. In the garbage truck according to claim 1.
Below the dust inlet, an emergency stop operation unit that is operated by the person to stop the operation of the dust loading device is arranged.
The foot operation switch is arranged on the side of the emergency stop operation unit, and is arranged deeper on the inner side of the dust input box than the emergency stop operation unit. car. In the garbage truck according to claim 1 or 2.
The foot operation switch is
A garbage truck having a sensing space on the inner side of the dust input box, and having a configuration for detecting that the toes of the person have entered the sensing space. In the garbage truck according to any one of claims 1 to 3,
A power source switch for turning on / off the power source of the dust loading device is provided.
The garbage truck is characterized in that the control device is configured to enable the foot operation switch on condition that the power source of the dust loading device is turned on by the power source switch. In the garbage truck according to any one of claims 1 to 4,
A loading button for operating the dust loading device is provided.
The dust collecting vehicle is characterized in that the control device is configured to disable the foot operation switch on condition that the dust loading device is operated by an on operation of the loading button. .. In the garbage truck according to claim 4.
The control device is
The opening / closing door is controlled so as to close the dust inlet and the foot operation switch is disabled, provided that the power source of the dust loading device is turned off by the power source switch. A garbage truck characterized by being present.

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