JP2021155215A - Garbage collection truck and method of using the same - Google Patents

Abstract

To make it possible to check a position of a discharge plate in a garbage collection truck by a simple method.SOLUTION: The garbage collection truck includes a garbage storage box 3 and a garbage input box 6 connected to the garbage storage box 3. Inside the garbage storage box 3, a discharge plate moving mechanism 18 is provided to move a discharge plate 17 in a front-back direction by extending and retracting a discharge hydraulic cylinder 16. A garbage loading mechanism 20 driven by a plurality of hydraulic actuators for loading is provided in the garbage input box 6. The hydraulic cylinder 16 for discharging and a hydraulic actuator for loading are driven by hydraulic oil from a hydraulic oil tank 62. A PLC 50 is provided to determine that the hydraulic actuator for loading is in a specified stop position and that the oil level of the hydraulic oil in the hydraulic oil tank 62 has stabilized. An amount of hydraulic oil in the hydraulic oil tank 62 is converted to a front-back position of the discharge plate 17 on the basis of the determination of the PLC 50 and is read out.SELECTED DRAWING: Figure 3

Description

The present invention relates to a garbage truck and a method of using the same, and more particularly to estimating the position of a movable discharge plate provided inside the dust storage box.

Conventionally, a dust storage box and a dust input box connected to the dust storage box are provided, and inside the dust storage box, there is a discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expanding and contracting the discharge hydraulic cylinder. The dust loading box is provided with a dust loading mechanism driven by a plurality of loading hydraulic actuators, and the discharging hydraulic cylinder and the loading hydraulic actuator utilize the hydraulic oil of the hydraulic oil tank. Driven dust collecting vehicles are known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-201481 (particularly FIGS. 2 and 6)

The operator may estimate the load capacity in the dust storage box from the position of the discharge plate in order to prevent the dust storage box from being overloaded.

However, it is difficult to visually recognize the discharge plate and the discharge hydraulic cylinder from the outside, and it is difficult to visually confirm the expanded / contracted state. In a conventional garbage truck as in Patent Document 1, it is necessary to open and close the deodorant door in front of the garbage storage box to check the position of the discharge plate, which increases the flow line different from the original collection work. , Work man-hours will increase.

Furthermore, it is possible to detect the position of the discharge plate by providing a switch or sensor on the discharge plate or the discharge hydraulic cylinder, but in that case, install the switch or sensor inside the dust storage box and judge from the output result. There must be. However, installing a switch or a sensor in the dust storage box has a problem that the number of parts, installation cost, maintenance man-hours, and the like are greatly increased. In addition, the layout for installing switches and sensors in the dust storage box may be strict.

The present invention has been made in view of this point, and an object of the present invention is to make it possible to confirm the position of a discharge plate by a simple method and prevent overloading of dust.

In order to achieve the above object, in the present invention, attention is paid to the cycle drive of the dust loading mechanism, and the position of the discharge plate is estimated from the oil level position of the hydraulic oil tank.

Specifically, in the first invention, a dust storage box and a dust input box connected to the dust storage box are provided, and inside the dust storage box, a discharge plate is provided by expanding and contracting a discharge hydraulic cylinder. The discharge plate moving mechanism for moving the vehicle in the front-rear direction is provided, and the dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators, and is provided with the discharging hydraulic cylinder and the loading. The flood control actuator is intended for a dust collecting vehicle that is driven and controlled by a control unit using hydraulic oil in a hydraulic oil tank provided outside the dust storage box.

Then, the control unit includes a determination unit for determining that the loading hydraulic actuator is in the specified stop position and the oil level of the hydraulic oil in the hydraulic oil tank is stable.
Based on the determination of the determination unit, the hydraulic oil amount of the hydraulic oil tank is converted into the front-rear position of the discharge plate and read.

Since the discharge hydraulic cylinder generally has a long stroke and uses a large amount of hydraulic oil, the oil level in the hydraulic oil tank fluctuates greatly due to expansion and contraction work. On the other hand, the loading hydraulic actuator is in a constant posture at a predetermined specified stop position during one cycle, and the amount of hydraulic oil remaining on the hydraulic actuator side at that time is determined. Therefore, when the hydraulic oil returns to the hydraulic oil tank and the oil level of the hydraulic oil stabilizes with the loading hydraulic actuator in the above-mentioned specified stop position, the hydraulic oil used by the discharge hydraulic cylinder is released from the oil level. Can be estimated. Thereby, the contracted state of the discharge hydraulic cylinder can be estimated from the oil level height. That is, after the determination unit determines that the hydraulic actuator for loading is in the specified stop position and the oil level of the hydraulic oil in the hydraulic oil tank is stable by using a timer or the like, the oil level of the hydraulic oil is high. From this, the front-back position of the discharge plate can be estimated. Therefore, it is not necessary to install a switch or a sensor for measuring the position of the discharge plate inside the dust storage box to detect the position of the discharge plate, and it is possible to avoid an increase in the number of parts, installation cost, maintenance man-hours, and the like. .. In addition, since the judgment unit can stop the loading hydraulic actuator at the specified stop position and always reproduce the state in which the oil level is stable, a plurality of loading hydraulic actuators are the same in addition to the discharge hydraulic cylinder. Even though the hydraulic oil of the hydraulic oil tank is used, the front-rear position of the discharge plate can be estimated accurately.

In the second invention, in the first invention,
Based on the determination of the determination unit, the loading hydraulic actuator is at the specified stop position and is provided with a notification unit for notifying the operator that the oil level of the hydraulic oil in the hydraulic oil tank is stable.

According to the above configuration, for example, when the operator visually inspects the height of the oil level of the hydraulic oil tank and estimates the front-rear position of the discharge plate, the loading hydraulic actuator is not in the specified stop position, or the hydraulic oil Even though the oil level of the tank is not stable, it is possible to reliably prevent the operator from accidentally trying to estimate the front-rear position of the discharge plate from the height of the oil level.

In the third invention, in the first invention,
It is equipped with a level sensor that detects the amount of hydraulic oil in the hydraulic oil tank and is electrically connected to the determination unit.
Based on the detection information of the level sensor, the determination unit calculates the front-rear position of the discharge plate.

According to the above configuration, the level sensor detects the oil level of the hydraulic oil without visually checking the oil level of the hydraulic oil. Therefore, the determination unit uses the detection result of the discharge hydraulic cylinder. The degree of expansion and contraction can be estimated. From the estimation result, the determination unit can easily estimate the front-rear position of the discharge plate.

In the fourth invention, in the third invention,
Equipped with a storage unit that stores the detection information of the above level sensor
The loading hydraulic actuator is configured to detect a hydraulic oil leak in the hydraulic oil tank from the difference between the two detection information stored in the storage unit at two time points at the specified stop position.

According to the above configuration, if the hydraulic actuators such as the discharge hydraulic cylinder are in the same state at the specified stop position, the oil level of the hydraulic oil in the hydraulic oil tank is usually at the same height after the oil level is stable. Therefore, if the difference between the detection information at the two time points of the specified stop position stored in the storage unit becomes large, it can be determined that the hydraulic oil is leaking. Therefore, it is not necessary to overlook the leakage of hydraulic oil.

In the fifth invention, in the third or fourth invention,
The discharge hydraulic cylinder is a multi-stage telescopic hydraulic cylinder, and the hydraulic circuit including the loading hydraulic actuator and the discharge hydraulic cylinder is provided with a pressure sensor for detecting the pressure in the hydraulic circuit. A solenoid check valve controlled by the control unit is provided between the back pressure side oil chamber of the discharge hydraulic cylinder and the hydraulic oil tank in the hydraulic circuit, and the loading hydraulic actuator is being loaded. In addition, when the internal pressure of the hydraulic circuit exceeds the threshold value, the control unit is configured to release the solenoid check valve, reduce the discharge hydraulic cylinder, and advance the discharge plate. The control unit is configured to estimate the position of the discharge plate based on the determination of the determination unit and change the threshold value according to the estimated position of the discharge plate.

In the case of a multi-stage telescopic hydraulic cylinder, the pressure receiving area differs for each rod stage. Therefore, when the solenoid check valve is opened when a predetermined value of force is applied to the discharge plate from dust regardless of the current position of the rod, the hydraulic circuit increases as the pressure receiving area of the rod increases. It is necessary to lower the threshold of the internal pressure of. Since the position of the rod can be estimated from the position of the discharge plate, if the threshold value of the internal pressure of the hydraulic circuit is changed according to the estimated position of the discharge plate, the rod is currently in the position of the discharge plate. Regardless of whether or not, the timing at which the discharge plate advances can be maintained in an appropriate state.

In the sixth invention, in any one of the first to fifth inventions,
The control unit has the determination unit.

According to the above configuration, since the control unit such as the PLC is provided with the determination unit, the amount of hydraulic oil in the hydraulic oil tank can be reliably detected together with the control of the dust loading mechanism and the discharge plate moving mechanism of the control unit.

In the seventh invention, in any one of the first to sixth inventions,
The specified stop position is a one-cycle stop position of the dust loading mechanism.

According to the above configuration, if it is the one-cycle stop position when the loading work is completed, it is in the normal standby state, so that it is not necessary to operate the dust loading mechanism only for confirming the position of the discharge plate. The sensor for determining whether or not the loading hydraulic actuator is in the one-cycle stop position and the sensor for determining whether or not the loading hydraulic actuator is in the specified stop position can be used in combination. Therefore, it is possible to easily check the oil level of the hydraulic oil in the hydraulic oil tank and avoid an increase in the number of parts, installation cost, maintenance man-hours, and the like.

In the eighth invention, a dust storage box, a dust input box connected to the dust storage box, and a hydraulic oil tank provided outside the dust storage box are provided, and the inside of the dust storage box is provided. A discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expanding and contracting the discharge hydraulic cylinder is provided, and the dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators. The discharge hydraulic cylinder and the loading hydraulic actuator are intended for a dust collecting vehicle that is driven and controlled by a control unit using the hydraulic oil of the hydraulic oil tank.
The above garbage truck
A level gauge provided at a visible position in the hydraulic oil tank to indicate the oil level of the hydraulic oil, and
The first mark and the discharge hydraulic pressure provided on the level gauge and attached to the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is in the most contracted state and at the one-cycle stop position of the dust loading mechanism. Further provided with a display member having a second mark attached to the liquid level position of the level gauge in the state where the cylinder is most extended and at the one-cycle stop position of the dust loading mechanism.
Between the first mark and the second mark, the level gauge is in the state where the discharge hydraulic cylinder is between the most contracted state and the most extended state and is in the one-cycle stop position. A scale is provided so that the position of the discharge plate can be estimated by looking at the position of the liquid level of the above.

According to the above configuration, the first mark indicating the oil level height at the most contracted position (the frontmost position of the discharge plate) of the discharge hydraulic cylinder at the one-cycle stop position of the dust loading mechanism, and the most extended position. A display member having a second mark indicating the oil level at (the rearmost position of the discharge plate) is attached to the corresponding position of the level gauge of the hydraulic oil tank, and further between the first mark and the second mark. If a scale that can estimate the position of the discharge plate is provided in, the position of the discharge plate is likely to be determined depending on the height of the oil level in the hydraulic oil tank at the one-cycle stop position at the time of confirmation. Can be estimated. In particular, when the discharge hydraulic cylinder is a multi-stage telescopic hydraulic cylinder, the pressure receiving area differs for each rod stage, so the change when the discharge hydraulic cylinder is extended from full contraction to full extension at equal intervals. And the change in the liquid level of the hydraulic oil tank are not in a simple proportional relationship. Therefore, by providing the scale at a position corresponding to the stroke amount of the discharge hydraulic cylinder, the position of the discharge plate between the frontmost end position and the rearmost end position can be accurately estimated.

In the ninth invention, a dust storage box, a dust input box connected to the dust storage box, and a hydraulic oil tank provided outside the dust storage box are provided, and the inside of the dust storage box is provided. A discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expanding and contracting the discharge hydraulic cylinder is provided, and the dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators. The discharge hydraulic cylinder and the loading hydraulic actuator are intended for a method of using a dust collecting vehicle that is driven and controlled by a control unit using the hydraulic oil of the hydraulic oil tank.

And in the above usage of the garbage truck,
Prepare a display member to be attached to the level gauge of the hydraulic oil tank,
Align the first mark of the display member with the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is in the most contracted state and at the one-cycle stop position of the dust loading mechanism.
Align the second mark of the display member with the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is most extended and at the stop position of one cycle.
By observing the liquid level position of the level gauge between the first mark and the second mark at the one-cycle stop position, the position of the discharge plate is estimated.

According to the above usage method, the oil level height at the most reduced position (the frontmost position of the discharge plate) of the discharge hydraulic cylinder at the one-cycle stop position of the dust loading mechanism is used as the first mark, and the most extended position. If a display member such as a sticker with the oil level height at (the rearmost position of the discharge plate) as the second mark is attached to the level gauge of the hydraulic oil tank, the oil level at the one-cycle stop position at the time of confirmation can be found. It is possible to estimate the position where the discharge plate is likely to be based on the height between the first mark and the second mark. Furthermore, by checking the level gauge of the hydraulic oil tank provided outside the dust storage box in the collection work flow line, the position of the discharge plate can be estimated while minimizing the increase in work man-hours.

As described above, according to the present invention, the operation in the hydraulic oil tank provided outside the dust storage box is performed without providing a switch or a sensor for measuring the position of the discharge plate inside the dust storage box. The position of the discharge plate can be easily estimated from the position of the oil level. As a result, it is possible to avoid an increase in the number of parts, mounting cost, maintenance man-hours, and the like. In addition, since the judgment unit can stop the loading hydraulic actuator at the specified stop position and always reproduce the state in which the oil level is stable, a plurality of loading hydraulic actuators are the same in addition to the discharge hydraulic cylinder. Even though the hydraulic oil of the hydraulic oil tank is used, the front-rear position of the discharge plate can be estimated accurately.

It is a rear view which enlarges and shows the level gauge in the hydraulic oil tank of the garbage truck which concerns on embodiment of this invention, and the periphery thereof. It is a side view which shows the outline of the garbage truck which concerns on embodiment of this invention. It is a figure which shows the outline of the dust loading mechanism, the discharge plate moving mechanism, and the hydraulic circuit. It is a hydraulic circuit diagram including a dust loading mechanism and a discharge plate moving mechanism. It is a perspective view which shows the level gauge and its periphery in an enlarged manner. It is a flowchart which shows the use method of the garbage truck which concerns on Embodiment 1. It is a flowchart which shows the use method of the garbage truck which concerns on Embodiment 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
-Composition of garbage truck-
FIG. 2 shows the garbage truck 1 according to the first embodiment of the present invention, and the garbage truck 3 is mounted on the chassis 2 of the garbage truck 1. The rear opening 4 of the dust storage box 3 is provided with a dust loading box 6 pivotally supported above the dust storage box 3 by a loading box support pin 5. The dust input box 6 is rotatably configured around the input box support pin 5 by a rotating cylinder 9 provided between the dust storage box 3 and the dust input box 6.

The garbage truck 1 includes a power take-off device (PTO) 52 (shown in FIG. 4) driven by the engine 40 of the chassis 2. The power of the power extraction device 52 drives the flood control device 30 including various hydraulic actuators.

A loading port 7 is opened at the rear of the dust loading box 6, and a dust loading mechanism 20 is provided inside the opening. The dust loading mechanism 20 is for compressing the dust thrown into the dust loading box 6 through the loading port 7 and loading it into the dust storage box 3.

As shown in FIGS. 2 and 3, guide groove members 8 are laid on both side walls of the dust input box 6 from the front upper portion toward the rear lower portion, which also serves as a reinforcing frame. A sliding plate 10 that extends to the full width thereof is housed in the dust input box 6.

The sliding plate support shaft 12 is inserted through the boss portions 19 provided at the left and right ends of the upper back surface of the sliding plate 10. The sliding plate support shaft 12 exceeds the sliding opening (not shown) formed on the side wall of the dust input box 6 in accordance with the sliding distance of the sliding plate 10, and is from the inside of the dust input box 6. It is arranged so as to protrude outward.

Sliding between the sliding plate support shaft 12 projecting outward from the side wall of the dust input box 6 and the lower portion of the dust input box 6 provided along the inclination direction of the guide groove member 8 on the outside of the dust input box 6. Cylinder 13 (shown only in FIG. 4) is connected. The sliding plate 10 is reciprocated up and down along the guide groove member 8 by the expansion and contraction operation of the sliding cylinder 13.

As shown in FIGS. 2 and 3, a compression plate 15 that extends to the full width of the dust input box 6 is supported at the lower end of the sliding plate 10 so as to be swingable back and forth. The tip of the compression plate 15 is slightly refracted toward the front. A press cylinder 14 is connected between the connecting portion 15a projecting from the back surface of the compression plate 15 and the sliding plate support shaft 12 provided on the upper portion of the back surface of the sliding plate 10, and the press cylinder 14 The compression plate 15 is swung back and forth by the expansion and contraction operation.

With this configuration, the dust loading mechanism 20 operates by reversing, lowering, compressing, and raising the sliding plate 10 and the compression plate 15 as one cycle due to the expansion and contraction operation of the sliding cylinder 13 and the press cylinder 14. As a result, the dust thrown into the dust throwing box 6 through the throwing port 7 is configured to be loaded into the dust storage box 3.

The sliding cylinder 13 and the press cylinder 14 constitute a loading hydraulic actuator.

As shown in FIGS. 2 and 3, the dust storage box 3 is provided with a discharge plate moving mechanism 18 driven by the hydraulic device 30 to discharge the dust in the dust storage box 3. Specifically, a discharge plate 17 is slidably arranged in the dust storage box 3 in the front-rear direction. The discharge plate 17 is a plate-like body formed to have substantially the same size as the width and vertical height of the dust storage box 3, and slides back and forth in the dust storage box 3 by the expansion and contraction operation of the discharge hydraulic cylinder 16. Has been done. The discharge hydraulic cylinder 16 is composed of, for example, a multi-stage telescopic hydraulic cylinder having one cylinder (first stage 16a), two cylinders (second stage 16a) and three cylinders (third stage 16c). The discharge hydraulic cylinder 16 is installed between the discharge plate 17 and the front wall of the dust storage box 3 in the dust storage box 3.

The dust collecting vehicle 1 has a PLC (programmable logic controller) 50 as a control unit, and the PLC 50 controls a dust loading mechanism 20, a discharge plate moving mechanism 18, a hydraulic device 30, and the like, and of the hydraulic device 30. It is configured to collect and store the operating status from a proximity sensor 66 or the like provided in the vicinity of the hydraulic actuator, which will be described later. That is, the PLC 50 also serves as a storage unit for storing various signals and operating conditions from the proximity sensor 66 and the like.

-Flood control equipment configuration-
FIG. 4 shows a hydraulic circuit 61 of the hydraulic equipment 30 of the garbage truck according to the present embodiment. As shown in the figure, the hydraulic device 30 includes a hydraulic pump 51 driven by the power extraction device 52. The hydraulic pump 51 provides the oil pressure for driving the dust loading mechanism 20, the discharge plate moving mechanism 18, and the like described above. In the hydraulic device 30, the sliding cylinder 13 and the press cylinder 14 as the loading hydraulic actuator and the discharging hydraulic cylinder 16 are each hydraulically controlled. In addition to the hydraulic device 30, the rotating cylinder 9 for rotating the dust input box 6 with respect to the dust storage box 3 and the rear opening 4 of the dust storage box 3 are closed by the dust input box 6. A lock cylinder (not shown) for locking in the state is provided.

The cylinders 9, 13, 14 and 16 are connected to the control valve 63 via the hydraulic pipe 61c. The control valve 63 is controlled by the PLC 50. The control valve 63 includes a plurality of solenoid valves 63a, which are partially shown in FIG. 3, and supplies hydraulic oil discharged from the hydraulic pump 51 to a desired cylinder by switching the opening / closing port of the solenoid valves. As a result, switching of the expansion / contraction operation of the cylinder is controlled or the operation is stopped. More specifically, the solenoid valve 63a of the control valve 63 includes a first solenoid valve 63b for switching the expansion / contraction operation of the press cylinder 14 and a second solenoid valve 63c for switching the expansion / contraction operation of the discharge hydraulic cylinder 16. And exist. Others Although omitted in FIG. 4, some solenoid valves 63a switch the expansion / contraction operation of the rotating cylinder 9 and the expansion / contraction operation of the sliding cylinder 13.

The hydraulic device 30 is provided with a hydraulic oil tank 62 for storing hydraulic oil outside the dust storage box 3, and controls the hydraulic oil in the hydraulic oil tank 62 by being sucked up by the hydraulic pump 51 and circulated to the hydraulic pipe 61a on the supply side. It is configured to supply the valve 63. Then, the hydraulic oil that passes through the control valve 63 and returns flows through the hydraulic pipe 61b on the recovery side, is filtered by the return filter 64, and then is collected again in the hydraulic oil tank 62.

A solenoid check valve 63d controlled by the PLC 50 is provided between the back pressure side oil chamber of the discharge hydraulic cylinder 16 and the hydraulic oil tank 62 in the hydraulic circuit 61. The solenoid check valve 63d is released by the PLC 50 when the pressure in the hydraulic circuit 61 exceeds the threshold value during the loading operation of the loading hydraulic actuators 13 and 14. The hydraulic cylinder is configured so that the discharge hydraulic cylinder 16 is reduced and the discharge plate 17 is advanced by releasing the solenoid check valve 63d for a predetermined time.

The hydraulic circuit 61 is provided with a pressure sensor 65 for measuring the oil pressure in the hydraulic circuit 61 (for example, the pressure in the compression circuit of the press cylinder 14), and the electric signal of the pressure sensor 65 is input to the PLC 50. It has become like. Further, electric signals from the rotating cylinder 9, the sliding cylinder 13 as the loading hydraulic actuator, and the proximity sensor 66 (which may be a limit switch) provided on the press cylinder 14 are also transmitted to the PLC 50. There is.

Further, as shown in FIGS. 1, 2 and 5, the hydraulic oil tank 62 is attached to the side of the chassis 2. In the hydraulic oil tank 62, a level gauge 67 indicating the oil level height in the hydraulic oil tank 62 is provided at a position visible from the side of the vehicle. The level gauge 67 is provided on the side surface of the hydraulic oil tank 62, and is arranged at a position where the operator can confirm from the flow line of the operator moving from the driver's cab 2a to the dust input box 6. Further, a stop position indicator lamp 69 as a notification unit is provided in the vicinity of the level gauge 67 on the side surface of the hydraulic oil tank 62. The stop position indicator lamp 69 is also arranged at a position where the operator can confirm it from the flow line of the operator moving from the driver's cab 2a to the dust input box 6. The hydraulic oil tank 62 may be provided between the cab 2a and the dust storage box 3 as in Patent Document 1. Also in this case, it is desirable that the level gauge 67 and the stop position indicator lamp 69 are in positions that can be visually recognized by the operator on the above-mentioned movement line.

-The action of PLC-
The PLC 50 controls the power extraction device 52, the dust loading mechanism 20, the discharge plate moving mechanism 18, and the like, and during its operation, information such as the proximity sensor 66 and the pressure sensor 65 is transmitted to and stored in the PLC 50. The PLC 50 can determine which work the dust loading mechanism 20 is performing in one cycle from the signal of the proximity sensor 66 or the like. The PLC 50 has a timer, and after the end of one cycle, it is determined that a predetermined time has elapsed. For example, the PLC 50 transmits a signal to the stop position indicator lamp 69 when a predetermined time has elapsed after reaching the one-cycle stop position, which is the specified stop position (state in FIG. 2).

As described above, the PLC 50 plays a role of a determination unit capable of determining that the loading hydraulic actuators 13 and 14 are in the specified stop positions and the oil level of the hydraulic oil in the hydraulic oil tank 62 is stable.

-Procedure for attaching display members-
Next, the procedure for attaching the display member 80 in the garbage truck 1 according to the present embodiment will be described.

First, as shown in FIG. 6, in step S01, a display member 80 made of a discharge plate setting scale label to be attached to the level gauge 67 of the hydraulic oil tank 62 is prepared.

Then, in step S02, the discharge hydraulic cylinder 16 is brought into the most contracted state so that the discharge plate 17 is in the foremost position.

Next, in step S03, the dust loading mechanism 20 is set to the specified stop position (one cycle stop position) of the dust loading mechanism 20.

Next, in step S04, since the PLC 50 grasps the state of each hydraulic actuator from the state of the proximity sensor 66, the oil of the level gauge 67 has passed a predetermined time by a timer or the like after reaching the specified stop position. Determine if the surface is stable.

When the predetermined time elapses, the stop position indicator lamp 69 is turned on in step S05. In addition, step S02 and step S03 are in no particular order.

After confirming that the stop position indicator lamp 69 is lit, in step S06, the first mark 81 of the display member 80 (the “front” mark in FIG. 1) is the hydraulic oil liquid at that time. The display member 80 is attached so as to be in the surface position. As shown in FIG. 5, it is desirable that the sticking position is a position that can be easily confirmed from the flow line of the collecting work of the worker.

Next, in step S07, the discharge plate 17 is moved to the most extended state of the discharge hydraulic cylinder 16 so that the discharge plate 17 is at the rearmost position.

Next, in step S08, the PLC 50 confirms that the predetermined time has elapsed and the oil level has stabilized, and in step S09, the stop position indicator lamp 69 is turned on.

Then, the operator puts the second mark 82 of the display member 80 at the position of the liquid level of the level gauge 67 in the state where the discharge hydraulic cylinder 16 is most extended and at the position where the dust loading mechanism 20 is stopped for one cycle. To match. That is, as shown in FIG. 1, the "rear" mark is attached on the display member 80 so as to match the liquid level height. The display member 80 does not need to be changed in the sticking position as long as the amount of hydraulic oil does not increase or decrease. Further, between the first mark 81 and the second mark 82, the level gauge is in the state where the discharge hydraulic cylinder 16 is between the most contracted state and the most extended state and is in the one-cycle stop position. The scale 83 is provided so that the position of the discharge plate 17 can be estimated by looking at the position of the liquid level of 67 together.

In this way, with the display member 80 attached, it is confirmed that the stop position display lamp 69 is lit each time the loading operation is completed, and between the first mark 81 and the second mark 82. Look at the liquid level position of the level gauge 67 together with the scale 83. Thereby, the position of the discharge plate 17 can be estimated. If it is in the one-cycle stop position when the loading work is completed, the hydraulic oil used in each hydraulic actuator also returns to the hydraulic oil tank 62 and the oil level is stable without operating the dust loading mechanism 20 in particular. Therefore, it is easy to check the oil level of the hydraulic oil in the hydraulic oil tank 62.

As described above, in the present embodiment, the display member indicating the oil level height at the most contracted position and the oil level height at the most extended position of the discharge hydraulic cylinder 16 at the one-cycle stop position of the dust loading mechanism. If the 80 is attached to the level gauge 67 of the hydraulic oil tank 62, it is possible to estimate the position where the discharge plate 17 is likely to be, depending on the height of the oil level at the one-cycle stop position at that time.

As described above, in the present embodiment, when the loading hydraulic actuators 13 and 14 are in the specified stop position corresponding to the one-cycle stop position, the hydraulic oil used in these loading hydraulic actuators 13 and 14 When the unnecessary hydraulic oil returns to the hydraulic oil tank 62 and the oil level of the hydraulic oil in the hydraulic oil tank 62 stabilizes after a lapse of a predetermined time, the discharge hydraulic cylinder is discharged from the oil level. The hydraulic oil used by 16 can be estimated, and the contracted state of the discharge hydraulic cylinder 16 can be estimated from this.

That is, after the PLC50 determines that the loading hydraulic actuators 13 and 14 are in the specified stop positions and the oil level of the hydraulic oil in the hydraulic oil tank 62 is stable, the operator can perform the hydraulic oil indicated by the level gauge 67. The front-rear position of the discharge plate 17 can be estimated from the relationship between the oil level height and the display member 80.

Therefore, it is not necessary to install a switch or a sensor inside the dust storage box 3, and it is possible to avoid an increase in the number of parts, installation cost, maintenance man-hours, and the like.

Further, by checking the level gauge 67 of the hydraulic oil tank 62 in the collection work flow line, the position of the discharge plate 17 can be estimated while minimizing the increase in work man-hours, and overloading can be prevented.

Therefore, according to the garbage truck 1 according to the present embodiment, the position of the discharge plate 17 can be easily positioned from the oil level position of the hydraulic oil in the hydraulic oil tank 62 without providing a switch or a sensor inside the dust storage box 3. Can be estimated to.

(Embodiment 2)
FIG. 7 shows a flowchart showing a method of using the garbage truck 1 according to the second embodiment of the present invention, in which the PLC 50 does not estimate the position of the discharge plate 17 by looking at the display member 80, but the discharge plate 17 It is different from the first embodiment in that the position of the above is estimated. In each of the following embodiments, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the display member 80 is not attached to the hydraulic oil tank 62, but the hydraulic oil tank 62 is provided with a liquid level sensor 68 (shown only in FIG. 4) that detects the amount of hydraulic oil in an analog manner. .. The liquid level sensor 68 is not particularly limited as long as it is a sensor capable of analog output of the oil level height of the hydraulic oil in the hydraulic oil tank 62. For example, a float type liquid level sensor in which the float moves up and down according to the oil level height can be applied. A laser sensor may be used as the liquid level sensor 68. The hydraulic oil tank 62 may be provided with a liquid level switch. For example, the liquid level switch may be something like a float switch that turns on when the liquid level is touched. The liquid level sensor 68 may be adjustable to turn on at any liquid level of the user.

As shown in FIG. 4, the liquid level sensor 68 is electrically connected to the PLC 50, and the position of the oil level of the hydraulic oil in the current hydraulic oil tank 62 is determined from the liquid level sensor 68 to the PLC 50. The indicated signal is to be transmitted. The PLC 50 is configured to convert the amount of hydraulic oil in the hydraulic oil tank 62 into the front-rear position of the discharge plate 17 and read it when the dust loading mechanism 20 is in the specified stop position, as will be described later.

Further, the garbage truck 1 is provided with a discharge plate position notification lamp 70 as a notification unit for notifying the operator of the position of the discharge plate 17 based on the determination of the PLC 50.

Further, the garbage truck 1 is an indicator display device 72 that displays the position of the discharge plate 17 determined by the PLC 50 from the oil level height of the hydraulic oil in the hydraulic oil tank 62 based on the signal from the liquid level sensor 68. It has. The discharge plate position notification lamp 70 and the indicator display device 72 may be provided in the driver's cab 2a or in the dust input box 6.

Further, in the present embodiment, the PLC 50 includes a storage unit including a memory for storing the detection information of the liquid level sensor 68. For example, using the timer of the PLC 50, when one cycle of the dust loading mechanism 20 is completed and the specified stop position is reached, the indicator display device 72 operates when the liquid level position stabilizes after a predetermined time. The oil level height of the hydraulic oil in the oil tank 62 is displayed.

-How to use a garbage truck-
Next, a method of using the garbage truck 1 according to the present embodiment will be described.

First, in step S101, the liquid level sensor 68 is attached to the hydraulic oil tank 62 and electrically connected to the PLC 50.

Next, in step S102, the discharge hydraulic cylinder 16 is set to the most contracted state in order to bring the discharge plate 17 to the frontmost position.

Next, in step S103, the dust loading mechanism 20 is set to the state where the dust loading mechanism 20 is stopped for one cycle.

Since the PLC 50 grasps the state of each hydraulic actuator from the state of the proximity sensor 66, in step S104, it is determined by a timer or the like that the value of the liquid level sensor 68 is stable after a predetermined time has elapsed.

Next, in step S105, the oil level height at that time is stored and set as the frontmost position of the discharge plate 17.

Next, in step S106, the discharge plate 17 is moved to the most extended state of the discharge hydraulic cylinder 16 in order to set the discharge plate 17 at the rearmost position.

Next, in step S107, the PLC 50 confirms that the predetermined time has elapsed and the oil level has become stable by a timer or the like.

Next, in step S108, the PLC 50 stores the oil level height and sets it as the rearmost end position of the discharge plate 17.

The above setting work does not need to be reset as long as the amount of hydraulic oil does not increase or decrease.

Then, every time the loading operation is completed or instructed by the operator, in step S109, the PLC 50 detects the value of the liquid level sensor 68 when the dust loading mechanism 20 is in the specified stop position, and the liquid level thereof is detected. The position of the discharge plate 17 is estimated from the height and the frontmost end position and the rearmost end position of the discharge plate 17 set above.

The estimated position of the discharge plate is displayed on the indicator display device 72 in step S110. By doing so, the liquid level sensor 68 detects the oil level of the hydraulic oil in the hydraulic oil tank 62 without visually confirming the oil level of the hydraulic oil in the hydraulic oil tank 62. By looking at the indicator display device 72 indicated by, the operator can easily confirm the front-rear position of the discharge plate 17.

For example, the overload notification position of the discharge plate 17 in front of the overload is set in advance, and when the estimated position of the discharge plate 17 reaches this overload notification position in step S111, step S112 In, the discharge plate position notification lamp 70 or the like notifies that the predetermined position has been reached.

In step S113, the PLC 50 may automatically stop the operation of the loading hydraulic actuators 13 and 14 to prevent further loading.

In this way, the discharge plate position notification lamp 70, the indicator display device 72, and the like notify that the discharge plate 17 contains dust until it reaches a predetermined position, so that overloading can be reliably prevented. Can be done.

Further, in the present embodiment, since the PLC 50 includes a determination unit, the hydraulic oil amount of the hydraulic oil tank 62 can be reliably detected together with the control of the dust loading mechanism 20 and the discharge plate moving mechanism 18, and the detection thereof. From the result, the PLC 50 can grasp the position of the discharge plate 17.

-Modification example 1-
In the second embodiment, when the discharge hydraulic cylinder 16 contracts and the discharge plate 17 advances at the one-cycle stop position, the amount of hydraulic oil returned to the hydraulic oil tank 62 increases. Therefore, the switch-type liquid level sensor 68 may be turned on with the amount of hydraulic oil corresponding to the position of the discharge plate 17 preset by the user.

When the signal that the liquid level sensor 68 is turned on is transmitted to the PLC 50, the discharge plate position notification lamp 70 installed in the vehicle may be turned on. As a result, the operator can know the position of the discharge plate 17, and can effectively prevent overloading.

Further, when the liquid level sensor 68 is turned on, the PLC 50 may automatically stop the operation of the loading hydraulic actuators 13 and 14 to prevent further loading.

-Modification example 2-
In the second embodiment, the loading hydraulic actuators 13 and 14 are configured to detect a hydraulic oil leak in the hydraulic oil tank 62 from the difference between the two detection information stored in the storage unit at two time points at the specified stop position. You may.

The PLC 50 stores the detected value of the liquid level sensor 68 at predetermined time intervals.

Then, the liquid level heights of the discharge hydraulic cylinders 16 having the same length and different times at the specified stop positions are compared, and when the difference is equal to or greater than a predetermined value, the liquid leakage notification lamp 73 is blinked. It may be possible to notify the leakage of the hydraulic oil.

After the oil level stabilizes at the specified stop position, the oil level of the hydraulic oil in the hydraulic oil tank 62 should normally be at the same height, so if the difference in the detection information stored in the PLC50 as the storage unit becomes large, It can be determined that the hydraulic oil is leaking. Therefore, it is not necessary to overlook the leakage of hydraulic oil.

-Modification example 3-
The PLC 50 may be configured to change the operation contents of the loading hydraulic actuators 13 and 14 according to the position of the discharge plate 17.

In the second embodiment, since the discharge hydraulic cylinder 16 is a multi-stage telescopic hydraulic cylinder, the pressure receiving area is different for each of the rod stages 16a, 16b, 16c.

As shown in FIG. 3, the garbage truck 1 in the second embodiment has a discharge plate 17 stepped on in order to further compress the dust in the dust storage box 3 during the dust loading operation. If the pressure is kept on, it will not be possible to load the product. Therefore, when the internal pressure of the press cylinder 14 detected by the pressure sensor 65 during the ascending process exceeds a predetermined threshold value, the discharge plate 17 is retracted to create a space for new dust. ing. In order to load dust more optimally, it is necessary to make the discharge hydraulic cylinder 16 stretch as much as possible.

In the conventional garbage truck 1, the hydraulic circuit 61 is controlled only from the value of the pressure P of the pressure sensor 65. However, since the discharge hydraulic cylinder 16 is a multi-stage telescopic hydraulic cylinder as in the second embodiment, the pressure receiving area A changes depending on the number of stages, and the tensioning force changes. Assuming that the force to step on is F, F = pressure P × pressure receiving area A.

Since it can be estimated from the position of the discharge plate 17 which stage rod in the first stage 16a to the third stage 16c is pressing, the value of the predetermined threshold value of the pressure sensor 65 is changed according to the pressing pressure. By doing so, the optimum tensioning force F of the discharge plate 17 can be kept constant regardless of the number of steps of the rod that is expanded or contracted. Specifically, when the threshold value of the pressure sensor 65 is made constant regardless of the number of stages of the rod, the first stage 16a having a large pressure receiving area A has a greater force to step on than the third stage 16c having a small pressure receiving area A. There is a difference in the force F that becomes stronger and stretches. Therefore, in order to keep the tensioning force F of the discharge plate 17 constant regardless of the number of steps of the rod, the value of the predetermined threshold value to be read by the pressure sensor 65 is large in the first step 16a. The third stage 16c becomes smaller.

(Other embodiments)
The present invention may have the following configuration with respect to the above embodiment.

In the above embodiment, the dust loading mechanism 20 is a compression type including a sliding plate 10 and a compression plate 15, but the dust loading mechanism is rotated around the base end of the dust loading box 6 around the base end. A freely provided rotary plate and a push plate oscillatingly provided on the upper part of the rotary plate by a swing cylinder are provided, and the rotation operation of the rotary plate and the swing operation of the push plate cooperate with each other. The dust charged into the dust input box 6 may be compressed and loaded into the dust storage box 3. In this case as well, the position of the discharge plate 17 may be estimated from the oil level height of the hydraulic oil tank 62 at the specified stop position which is the one-cycle stop position.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and applications.

1 Garbage truck
2 chassis
2a cab
3 Garbage storage box
4 Rear opening
5 Input box support pin
6 Garbage input box
7 Input port
8 Guide groove member
9 Rotating cylinder
10 Sliding plate
12 Sliding plate support shaft
13 Sliding cylinder (hydraulic actuator for loading)
14 Press cylinder (hydraulic actuator for loading)
15 compression plate
15a connection
16 Discharge hydraulic cylinder
17 Discharge plate
18 Discharge plate movement mechanism
19 Boss part
20 Dust loading mechanism
30 Flood control equipment
40 engine
50 PLC (judgment unit)
51 hydraulic pump
52 Power take-out device
61 hydraulic circuit
61a hydraulic piping
61b hydraulic piping
61c hydraulic piping
62 Hydraulic oil tank
63 Control valve
63a solenoid valve
64 Return filter
65 pressure sensor
66 Proximity sensor
67 level gauge
68 Liquid level sensor
69 Stop position indicator lamp (notification unit)
70 Discharge plate position notification lamp
72 Indicator display device
73 Liquid leak notification lamp
80 Display member
81 1st landmark
82 Second landmark
83 scale

Claims (9)

A dust storage box and a dust input box connected to the dust storage box are provided, and inside the dust storage box, there is a discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expanding and contracting the discharge hydraulic cylinder. The dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators, and the discharging hydraulic cylinder and the loading hydraulic actuator are outside the dust storage box. It is a dust collecting vehicle that is driven and controlled by the control unit using the flood control of the hydraulic oil tank provided in.
It is provided with a determination unit for determining that the hydraulic actuator for loading is in the specified stop position and the oil level of the hydraulic oil in the hydraulic oil tank is stable.
A garbage truck characterized in that the amount of hydraulic oil in the hydraulic oil tank is converted to the front-rear position of the discharge plate and read based on the determination of the determination unit. The garbage truck according to claim 1.
Based on the judgment of the determination unit, the loading hydraulic actuator is at the specified stop position and is provided with a notification unit for notifying the operator that the oil level of the hydraulic oil in the hydraulic oil tank is stable. A characteristic garbage truck. The garbage truck according to claim 1.
It is equipped with a level sensor that detects the amount of hydraulic oil in the hydraulic oil tank and is electrically connected to the determination unit.
A garbage truck characterized in that the determination unit is configured to calculate the front-rear position of the discharge plate based on the detection information of the level sensor. The garbage truck according to claim 3.
Equipped with a storage unit that stores the detection information of the above level sensor
The loading hydraulic actuator is configured to detect a hydraulic oil leak in the hydraulic oil tank from the difference between the two detection information stored in the storage unit at two time points at the specified stop position. Garbage truck. The garbage truck according to claim 3 or 4.
The discharge hydraulic cylinder is a multi-stage telescopic hydraulic cylinder.
The hydraulic circuit including the loading hydraulic actuator and the discharging hydraulic cylinder is provided with a pressure sensor for detecting the pressure in the hydraulic circuit.
A solenoid check valve controlled by the control unit is provided between the back pressure side oil chamber of the discharge hydraulic cylinder and the hydraulic oil tank in the hydraulic circuit.
When the internal pressure of the hydraulic circuit exceeds the threshold value during the loading operation of the loading hydraulic actuator, the control unit releases the solenoid check valve to reduce the discharge hydraulic cylinder to reduce the discharge plate. Is configured to move forward,
Further, the control unit is characterized in that the position of the discharge plate is estimated based on the determination of the determination unit and the threshold value is changed according to the estimated position of the discharge plate. Garbage truck to do. The garbage truck according to any one of claims 1 to 5.
A garbage truck characterized in that the control unit has the determination unit. The garbage truck according to any one of claims 1 to 6.
The garbage truck is characterized in that the specified stop position is a one-cycle stop position of the dust loading mechanism. A dust storage box, a dust input box connected to the dust storage box, and a hydraulic oil tank provided outside the dust storage box are provided. Inside the dust storage box, a discharge hydraulic cylinder is provided. A discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expansion and contraction is provided, and the dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators, and the discharge hydraulic cylinder. The loading hydraulic actuator is a dust collecting vehicle that is driven and controlled by a control unit using the hydraulic oil in the hydraulic oil tank.
A level gauge provided at a visible position in the hydraulic oil tank to indicate the oil level of the hydraulic oil, and
The first mark and the discharge hydraulic pressure provided on the level gauge and attached to the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is in the most contracted state and at the one-cycle stop position of the dust loading mechanism. Further provided with a display member having a second mark attached to the liquid level position of the level gauge in the state where the cylinder is most extended and at the one-cycle stop position of the dust loading mechanism.
Between the first mark and the second mark, when the discharge hydraulic cylinder is in a state between the most contracted state and the most extended state and is in the one-cycle stop position, the above A garbage truck characterized in that a scale is provided so that the position of the discharge plate can be estimated by looking at the position of the liquid level of the level gauge. A dust storage box, a dust input box connected to the dust storage box, and a hydraulic oil tank provided outside the dust storage box are provided. Inside the dust storage box, a discharge hydraulic cylinder is provided. A discharge plate moving mechanism that moves the discharge plate in the front-rear direction by expansion and contraction is provided, and the dust loading box is provided with a dust loading mechanism that is cycle-driven by a plurality of loading hydraulic actuators. The loading hydraulic actuator is a method of using a dust collecting vehicle that is driven and controlled by a control unit using the hydraulic oil of the hydraulic oil tank.
Prepare a display member to be attached to the level gauge of the hydraulic oil tank,
Align the first mark of the display member with the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is in the most contracted state and at the one-cycle stop position of the dust loading mechanism.
Align the second mark of the display member with the liquid level position of the level gauge in the state where the discharge hydraulic cylinder is most extended and at the stop position of one cycle.
Use of a garbage truck characterized in that the position of the discharge plate is estimated by observing the liquid level position of the level gauge between the first mark and the second mark at the one-cycle stop position. Method.

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