JP2008150156A - Refuse collecting vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the temperature rise of an operating fluid for driving a refuse loading device. <P>SOLUTION: This refuse collecting vehicle comprises a temperature sensor 15 detecting the temperature of the operating fluid, and a cooling device (a cooling fan 13) for cooling the operating fluid, and performs control for cooling the operating fluid by driving the cooling device when the temperature detected by the temperature sensor is a predetermined value or higher. The output of the cooling device (the cooling fan 13) is changed according to the detected temperature. Control for stopping the refuse loading device is also performed when the detected temperature is a predetermined value or higher. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a garbage truck.

  A garbage collection vehicle has a cargo box mounted on the vehicle body, and a tailgate having a built-in dust loading device is connected to the rear of the cargo box. The dust loading device conveys the dust thrown into the tailgate into the packing box, the rotating plate that transports the dust thrown into the tailgate to the packing box side, and is carried by this rotating plate. Rotating plate type equipped with a push-in plate that pushes dust into the packing box, a scraping plate that turns and scrapes dust put into the tailgate, and a push-up that pushes the dust together with this push-in plate into the packing box A compression type equipped with a plate is well known.

  As shown in FIG. 4, the dust loading device was driven by hydraulic oil supplied from a hydraulic pump 20 driven by a part of the engine power of the garbage truck taken out by the PTO device. In this way, when using a part of the engine power as the driving force for the dust loading device, etc., the engine is operated and the dust is loaded while the engine speed is increased to obtain the required output. ing.

  In order to realize “idling stop” when loading garbage, the garbage truck described in Patent Document 1 is equipped with a storage battery that can be replaced with a spare battery or charged from an external power supply. The dust loading device or the like is driven by electric power, and the engine is stopped during the dust loading operation.

By the way, when the loading operation is performed while compressing the garbage in the garbage truck, a high pressure is applied, so that the oil temperature tends to be high. If the oil temperature becomes high (as a guideline, 100 ° C. or higher), the equipment may be damaged or malfunction may occur.
Also, the high temperature hydraulic oil becomes mist and leaks from the hydraulic oil tank. The leaked hydraulic oil pollutes the surroundings, and there is also a problem that the leaked minute oil adheres and accumulates on the surface of the vehicle body and grows into one large oil droplet and falls to the floor.
In addition to this, in recent years, the product has been moving in the direction of increasing the pressure of hydraulic oil due to the fact that the loading capacity of garbage trucks can be increased and the hydraulic pump can be downsized, and the problem of rising oil temperature has been expanding. . Patent Documents 2 to 5 describe inventions related to the oil pressure or oil temperature of the dust loading device.
JP 2005-170580 A No. 7-5045 JP-A-8-268504 JP-A-61-162401 JP 2003-40403 A

In the invention described in Patent Document 2, when an abnormally high pressure occurs in the hydraulic circuit, the cooler compressor is stopped, and the driving force of the traveling engine is concentrated on the dust pushing device side. Try to prevent the engine from stopping.
However, the invention described in Patent Document 2 detects pressure and controls based on this. The oil pressure and the oil temperature do not correspond one-to-one, and the oil temperature is 100 ° C. when the oil pressure is 0, or the oil temperature is −10 ° C. when the oil pressure is 180 kg / cm ² . Therefore, in the invention described in Patent Document 2, the accurate oil temperature cannot be grasped, and the problem of the oil temperature rise cannot be dealt with.

The invention described in Patent Document 3 controls the output timing of the lifting plate and the pushing cylinder based on the oil temperature.
However, the invention described in Patent Document 3 only controls the timing of hydraulic drive, and that alone increases the oil temperature, which may cause damage to the equipment, and copes with the problem of the oil temperature increase. I can't do it. The invention described in Patent Document 3 proposes operating as normally as possible when the oil temperature rises.

The invention described in Patent Document 4 changes the discharge amount based on hydraulic pressure. Changing the discharge amount leads to power down.
The invention described in Patent Document 5 shifts to the reversing process in the middle of the ascending process when a predetermined time elapses even if the dust plate becomes an obstacle during the ascending process of the pushing plate and the pushing plate does not rise. As a result, the work efficiency is increased without interrupting the work. Further, the invention described in Patent Document 5 tries to prevent an abnormal temperature rise of the pressure oil by forcibly stopping. The invention described in Patent Document 5 tries to avoid a useless operation such as moving to the next process operation when dust is clogged and the panel cannot move, or increasing the oil temperature by stopping the operation.

  In any of the above prior arts, means for accurately cooling the working oil of the dust loading device is not configured according to the oil temperature, and the above-described problem of rising oil temperature cannot be dealt with.

  The present invention has been made in view of the above-described problems in the prior art, and prevents the temperature of the hydraulic oil that drives the dust loading device from rising, and the temperature of the hydraulic oil increases due to equipment breakage or malfunction. It is an object of the present invention to provide a garbage truck that can prevent various problems caused by.

The invention according to claim 1 for solving the above-mentioned problem is a dust loading device driven by hydraulic pressure of hydraulic oil,
A temperature sensor for detecting the temperature of the hydraulic oil;
A cooling device for cooling the hydraulic oil,
When the temperature detected by the temperature sensor is equal to or higher than a predetermined value, the garbage collector is configured to drive the cooling device and control the hydraulic oil to be cooled by the cooling device.

  A second aspect of the present invention is the refuse collection vehicle according to the first aspect, wherein the cooling device is a blower fan.

  According to a third aspect of the present invention, when the temperature detected by the temperature sensor is equal to or higher than the first value, the blower fan is rotated at a relatively low speed, and the temperature detected by the temperature sensor is higher than the first value. 3. The garbage collection vehicle according to claim 2, wherein control is performed to rotate the blower fan at a relatively high speed when the value is equal to or greater than a second value. 4.

  According to a fourth aspect of the present invention, when the temperature detected by the temperature sensor is equal to or higher than a third value higher than the second value, the hydraulic drive output by the hydraulic oil to the dust loading device is stopped. The garbage truck according to claim 3, wherein the garbage collection vehicle is performed.

The invention according to claim 5 continues the state in which the hydraulic drive output is stopped because the temperature detected by the temperature sensor is equal to or higher than the third value.
(1) When the temperature detected by the temperature sensor is equal to or higher than a fourth value that is higher than the second value and lower than the third value, the hydraulic drive output is stopped.
(2) When the temperature detected by the temperature sensor is less than the fourth value and there is an operation input for instructing restart from the operator, control to allow the hydraulic drive output is performed. The garbage truck according to claim 4.

  According to the present invention, it is possible to prevent the problems caused by the temperature rise of the hydraulic oil, such as breakage of equipment and malfunction, by preventing the temperature rise of the hydraulic oil that drives the dust loading device. There is.

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

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the refuse collection vehicle 11 of the present embodiment is connected to the vehicle body 4 on which the cab 2 is mounted at the front and the cargo box 3 is mounted at the rear, and to the rear of the cargo box 3. The tailgate 5 includes a dust loading device (not shown) built in the tailgate 5 and the like.

  Further, as shown in FIG. 4, the garbage collection vehicle 11 includes a hydraulic pump 20 driven by engine power extracted by the PTO device, and a push plate provided in the dust loading device by the output of the hydraulic pump 20. Operate the panel. That is, the dust loading device is driven in a state where the engine is operating.

  In addition, as shown in FIG. 1, the garbage truck 11 includes a hydraulic oil tank 12 that stores hydraulic oil supplied to the hydraulic pump 20, a cooling fan (blower fan) 13 that cools the hydraulic oil tank 12, and And a controller 14 for controlling the cooling fan 13 and the like.

In FIG. 2, the block diagram of the main structures including the hydraulic fluid cooling system mounted in the garbage truck 11 is shown.
As shown in FIG. 2, the garbage collection vehicle 11 includes an analog temperature sensor 15 that detects the temperature of the hydraulic oil in the hydraulic oil tank 12, and an alarm buzzer 16 that is installed in the cab 2.

  The controller 14 controls the operation of the cooling fan 13, the alarm buzzer 16, and the output valve of the hydraulic pump 20 based on the detection result of the analog temperature sensor 15. The power supply 17 supplies power to the controller 14, the analog temperature sensor 15, the cooling fan 13, the alarm buzzer 16, and other electrical devices. In this embodiment, the power source 17 is a general-purpose battery that is charged by a generator driven by engine power and mounted under the cargo box 3.

Next, an example of the control operation by the controller 14 will be described with reference to the flowchart of FIG. The temperature values A to C shown below have a magnitude relationship of A <B <C.
First, the controller 14 receives the detection value of the analog temperature sensor 15 (step P1), and determines whether or not the temperature detected by the analog temperature sensor 15 is equal to or higher than a first temperature value A (for example, 60 ° C.) (step P2). .

When the temperature detected by the analog temperature sensor 15 is lower than the first temperature value A, that is, when the answer is No in Step P2, the controller 14 maintains the cooling fan 13 in a stopped state (Step P3) and performs the processing step. Move to P8.
When the temperature detected by the analog temperature sensor 15 is equal to or higher than the first temperature value A, that is, when the answer is Yes in Step P2, the controller 14 further determines whether or not the temperature is equal to or higher than the second temperature value B (for example, 80 ° C.). Judgment is made (step P4).

When the temperature detected by the analog temperature sensor 15 is equal to or higher than the first temperature value A and lower than the second temperature value B, ie, No in step P4, the controller 14 sends the low-speed rotation control signal S1 to the cooling fan 13. Output (step P5), and the process proceeds to step P8. As a result, the cooling fan 13 rotates at a low speed and air-cools the hydraulic oil tank 12.
When the temperature detected by the analog temperature sensor 15 is equal to or higher than the second temperature value B, that is, when the answer is Yes in Step P4, the controller 14 outputs the high-speed rotation control signal S2 to the cooling fan 13 (Step P6). Further, it is determined whether or not the temperature is equal to or lower than a third temperature value C (for example, 100 ° C.) (step P7). The cooling fan 13 rotates at high speed and cools the hydraulic oil tank 12 by air.

The controller 14 outputs a valve control signal S3 for controlling the output valve of the hydraulic pump 20 when the temperature detected by the analog temperature sensor 15 exceeds the third temperature value C, that is, when No in Step P7. Control is performed to stop the hydraulic drive output by the hydraulic oil to the dust loading device (step P11), and the process returns to step P1. The litter loading device is stopped, and if it is already stopped, it is stopped.
If the temperature detected by the analog temperature sensor 15 is not less than the second temperature value B and not more than the third temperature value C, that is, if the answer is Yes in Step P7, the controller 14 proceeds to Step P8.

  In step P8, loading operation is detected. That is, when the start instruction of the loading operation is input by the operator, or when the loading operation has not ended (that is, when the operation is continuing) (Yes in Step P9), the controller 14 A valve control signal S3 for controlling the valve of the hydraulic pump 20 is output according to the loading operation control program, the hydraulic drive output by the hydraulic oil to the litter loading device is controlled, and the litter loading device is loaded. (Step P10), and the process returns to Step P1. If there is no loading operation, that is, if No in Step P9, the controller 14 proceeds to Step P11 and further returns to Step P1. The litter loading device is stopped, and if it is already stopped, it is stopped.

  Since the control is performed as described above, when the temperature of the hydraulic oil reaches or exceeds the first temperature value A (for example, 60 ° C.), the cooling fan 13 starts and rotates at a low speed, and the hydraulic oil tank 12 is cooled by air. The hydraulic oil is cooled. When the temperature further rises and the temperature of the hydraulic oil becomes equal to or higher than a second temperature value B (for example, 80 ° C.), the cooling fan 13 rotates at high speed and the hydraulic oil is strongly cooled. When the temperature further rises and the temperature of the hydraulic oil exceeds a third temperature value C (for example, 100 ° C.), the loading operation of the dust loading device is stopped, the cause of heating the hydraulic oil is reduced, and the cooling fan The cooling of the hydraulic oil by 13 high-speed rotation is maintained. In addition, it is preferable that the alarm buzzer 16 sounds by the controller 14.

(Restart process 1)
When the temperature of the hydraulic oil exceeds the third temperature value C, the cooling proceeds, and when the temperature of the hydraulic oil becomes equal to or lower than the third temperature value C, the loading operation of the dust loading device restarts. However, in consideration of efficiency and safety, it is preferable to perform control for performing the next restart process 2.

(Restart process 2)
As the restart process 2, a fourth temperature value D (for example, 90 ° C.) having a relationship of B <D <C is provided, and the controller 14 detects that the temperature detected by the analog temperature sensor 15 is equal to or higher than the fourth temperature value D. In this case, the valve is controlled without restarting, and the stop of the hydraulic drive output by the hydraulic oil of the hydraulic pump 20 is maintained.

  As the restart process 2, two conditions for restarting the loading operation are provided. When the temperature detected by the temperature sensor is lower than the fourth temperature value and an operation input for instructing restart is received from the operator, the controller 14 controls the valve to control the hydraulic pressure by the hydraulic oil of the hydraulic pump 20. Allow drive output and restart loading operation.

  In this way, the threshold value for restarting the loading operation is set lower than the threshold value for stopping the loading operation, and there is a gap between them. Repeated stop / restart can be prevented. Also, safety is increased to avoid restart without operator operation.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. The garbage truck of this embodiment uses the cooling fan power source 17 described in the first embodiment as a storage battery 8 described below. The refuse collection vehicle of this embodiment carries the structure containing the hydraulic-oil cooling system shown in FIG. 2, and implements control similar to the said 1st Embodiment. In FIG. 5, the illustration of the hydraulic oil tank, the cooling fan, and the controller is omitted.

  As shown in FIG. 5, the garbage collection vehicle 1 of the present embodiment includes a dust discharge plate 6, a dust loading device 7, a storage battery 8 that supplies power, and a storage box 9 that stores the storage battery 8. Other parts that are the same as those in the first embodiment are denoted by the same reference numerals. The dust loading device 7 includes a rotating plate 7a and a pushing plate 7b.

  As shown in FIG. 6, the dust loading device 7 of this embodiment is driven by hydraulic oil supplied from an electric pump 10 driven by electric power from the storage battery 8. That is, the rotating plate 7a and the pushing plate 7b are driven by the electric power supplied from the storage battery 8 even when the engine is stopped.

The storage battery 8 supplies power for driving the rotating plate 7a and the pushing plate 7b of the dust loading device 7. Further, the storage battery 8 supplies power for driving the cooling fan 13 shown in FIG.
A plurality of storage batteries 8 are accommodated in the storage box 9 and are detachable, and can be replaced with spare storage batteries when power is reduced. In the present embodiment, a storage battery 8 that can be charged by a household power source and can be charged in a vehicle is used.
As shown in FIG. 5, the storage box 9 is placed between the cab 2 and the cargo box 3 of the vehicle body 4. A rail (not shown) extending in the left-right direction of the vehicle body is provided in a region on the upper surface of the vehicle body 4 where the storage box 9 is placed. A wheel (not shown) is provided at the lower part of the storage box 9. Then, by placing the wheels of the storage box 9 on the rails of the vehicle body 4 and running, the storage box 9 can be moved in the left-right direction of the vehicle body.

In the garbage truck 1 according to the second embodiment, the dust loading device 7 and the cooling fan are driven by the electric power supplied from the storage battery 8. Therefore, unlike the dust loading device that uses part of the engine power as the driving force of the dust loading device, it is possible to realize an “idling stop” when dust is loaded and when the cooling fan is driven. As a result, it is possible to prevent noise and exhaust gas from being generated when dust is loaded and when the cooling fan is driven, and fuel for driving the engine can be saved.
In any of the first and second embodiments described above, the present invention can be implemented without providing a special power source for the cooling fan.

In the above embodiment, the cooling device is a cooling fan, but the cooling device may be a water cooling device regardless of this, or water cooling and air cooling may be used in combination. For example, when the temperature exceeds a first temperature area A (for example, 60 ° C.), the water cooling device works, and when the temperature exceeds a second temperature value B (for example, 80 ° C.), the cooling fan for cooling the cooling water of the water cooling device rotates. It is good also as composition to do. Furthermore, a control for stopping the loading operation when the temperature exceeds a third temperature value (for example, 100 ° C.) may be performed. Of course, it is possible to control only the ON / OFF of the water cooling device without using the cooling fan.
When water cooling and air cooling are used in combination, air blown by a cooling fan may be applied not only to the cooling water of the water cooling device but also to the above-described hydraulic oil tank, and the target of air cooling may be both cooling water and hydraulic oil.

  In the above embodiment, the output of the cooling fan is controlled in two stages. However, the present invention is not limited to this, and it may be a one-stage control with only ON-OFF, or three or more stages according to the detected oil temperature. Control that changes steplessly is also possible. That is, it is effective to start the cooling fan as the detected temperature rises and to increase the output of the cooling fan stepwise or steplessly as the detected temperature further increases.

  In the above embodiment, the air cooling target of the cooling fan is the hydraulic oil tank. However, it is not limited to the hydraulic oil tank, and it may be blown to the heat generating portion by the hydraulic oil. It is preferable to select a site that can be efficiently cooled. Moreover, it is preferable to employ a structure that enhances heat dissipation, such as a heat radiating fin, in the air blowing target part (heat generating part).

1 is a side view of a garbage truck according to a first embodiment of the present invention. It is a block diagram of the principal composition containing the hydraulic fluid cooling system mounted in the garbage truck which concerns on the 1st, 2nd embodiment of this invention. It is a flowchart of the example of control by the controller shown in FIG. It is a block diagram which shows the drive system of the dust loading apparatus by engine motive power. It is a side view of the refuse collection vehicle which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the drive system of the electric dust loading device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Garbage truck 2 Driver's cab 3 Cargo box 4 Car body 5 Tailgate 11 Garbage truck 12 Hydraulic oil tank 13 Cooling fan 14 Controller 15 Analog temperature sensor 16 Alarm buzzer 17 Power supply

Claims (5)

A dust loading device driven by hydraulic oil pressure;
A temperature sensor for detecting the temperature of the hydraulic oil;
A cooling device for cooling the hydraulic oil,
A garbage collection vehicle that performs control to drive the cooling device and cool the hydraulic oil by the cooling device when the temperature detected by the temperature sensor is equal to or higher than a predetermined value. The garbage truck according to claim 1, wherein the cooling device is a blower fan. When the temperature detected by the temperature sensor is equal to or higher than the first value, the blower fan is rotated at a relatively low speed, and when the temperature detected by the temperature sensor is equal to or higher than the second value higher than the first value. The garbage truck according to claim 2, wherein the blower fan is controlled to rotate at a relatively high speed. The control for stopping the hydraulic drive output by the hydraulic oil to the refuse loading device is performed when the temperature detected by the temperature sensor is equal to or higher than a third value higher than the second value. 3. A garbage collection vehicle according to 3. Following the state where the hydraulic drive output is stopped due to the temperature detected by the temperature sensor being equal to or higher than the third value,
(1) When the temperature detected by the temperature sensor is equal to or higher than a fourth value that is higher than the second value and lower than the third value, the hydraulic drive output is stopped.
(2) When the temperature detected by the temperature sensor is less than the fourth value and there is an operation input for instructing restart from the operator, control to allow the hydraulic drive output is performed. The garbage truck according to claim 4.

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