JP2006124116A - Garbage collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform garbage collection work by using a separately placed driving source disposed to a vehicle body at the place requiring noise reduction while an engine for running is stopped, and to prohibit packing of garbage while the vehicle is running. <P>SOLUTION: A first hydraulic pump 28 is driven by the engine 26 for running and a second hydraulic pump 31 is driven by an engine 32 installed to a chassis separately from the engine 26 for running. A garbage packing device is operated by hydraulic pressure supplied from the first hydraulic pump 28 or the second hydraulic pump 31, and the garbage is packed into a dust housing mounted on a chassis. A solenoid selector valve 34 forcibly restricts the hydraulic pressure supply from the second hydraulic pump 31 to the dust packing device in a running state, and on the other hand, permits the hydraulic pressure supply when the travelling state is transited to a running stop state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a garbage collection vehicle in which a separate hydraulic unit is installed separately from a traveling engine.

In Patent Document 1, an electric motor is installed on the vehicle body separately from the traveling engine, and the hydraulic pressure from the first hydraulic pump driven by the traveling engine and the second hydraulic pump driven by the electric motor are disclosed. There is disclosed a garbage collection vehicle in which the operation of a dust filling device is controlled according to a filling cycle by two hydraulic systems including hydraulic pressure.
JP 2000-335706 A (pages 3 and 4, FIG. 1)

  However, in the garbage collection vehicle of Patent Document 1 described above, when the magnitude of the load acting on the dust clogging device is a predetermined value or less, the rotational speed of the traveling engine is not increased, and the second hydraulic pump is driven by the electric motor. By driving, the decrease in the amount of hydraulic pressure supplied from the first hydraulic pump is compensated by the hydraulic pressure supplied from the second pump, and when the load acting on the dust clogging device exceeds a predetermined value, the traveling engine As the engine speed is increased and the power supply to the electric motor is stopped or reduced, the traveling engine is always operating and a loud engine sound is scattered as noise around. In recent years when environmental issues are severe, it is urgently required to take measures to reduce noise. In particular, the dust collection work at night, and the dust collection work in a quiet residential area or a hospital, etc., are particularly necessary because the most attention is required for noise.

  On the other hand, when there is a separate drive source such as an electric motor in addition to the traveling engine as described above, the so-called “sinking” is performed, in which the second hydraulic pump is driven by the separate drive source and the dust clogging device is operated during traveling. Is possible, but this sinking operation is dangerous.

  The present invention has been made in view of such points, and the object of the present invention is to collect dust with a separate drive source installed on the vehicle body with the traveling engine stopped in a place where low noise is required. In addition to doing so, it was made impossible to carry out the sinking work while traveling.

  In order to achieve the above object, the present invention prevents the separate drive source from operating during travel, and allows the user to select either the travel engine or the separate drive source when the travel is stopped. Specifically, the following solutions were taken.

  That is, the invention according to claim 1 is driven by the first hydraulic pump driven by the traveling engine, the separate drive source installed on the vehicle body separately from the travel engine, and the separate drive source. A second hydraulic pump, a dust filling device that is operated by hydraulic pressure supplied from the first hydraulic pump or the second hydraulic pump, and packs dust in a dust storage box mounted on a vehicle body, and the dust filling device The hydraulic pressure supply from the second hydraulic pump is forcibly restricted in the traveling state, and is provided with a hydraulic pressure supply switching means that is permitted when the traveling state is shifted to the traveling stopped state.

  The invention according to claim 2 is the invention according to claim 1, wherein the separate drive source and the second hydraulic pump are housed in a sealed sound insulation box.

  According to the first aspect of the present invention, since the hydraulic pressure is not supplied from the second hydraulic pump to the dust clogging device in the traveling state, the dust clogging device does not operate so that a dangerous flushing operation cannot be performed during traveling. can do. On the other hand, since the hydraulic pressure is supplied from the second hydraulic pump to the dust filling device when the traveling state is shifted from the traveling state to the traveling stopped state, a traveling engine that generates a loud engine noise is required in a place where low noise is required. The dust collecting operation can be performed by a separate drive source which is stopped and generally has a lower sound than the traveling engine.

  According to the second aspect of the present invention, since the separate drive source and the second hydraulic pump are housed in the hermetic sound insulation box, the operation sound generated from them is not leaked to the outside, and further noise reduction is realized. be able to.

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

  3 to 5 show a garbage truck according to an embodiment of the present invention. 3 to 5, 1 is a cab, 2 is a chassis as a vehicle body, and the chassis 2 is mounted with a dust container box 4 having a dust container opening 3 that opens to the rear of the vehicle body, and the upper end of the dust container opening 3. A dust input box 5 is connected to a pivot 6 so as to be opened downward. The dust throwing box 5 is opened at the front side of the vehicle body and communicates with the dust filling port 3 of the dust containing box 4, and a throwing port 7 for throwing dust is opened at the lower back side. A chamber 8 is formed, and a dust filling device 9 for compressing, crushing and packing the dust into the dust storage box 4 is provided in the dust charging box 5.

  The dust clogging device 9 includes a guide groove member 10 made of grooved steel that is laid along both side walls of the dust input box 5 and is inclined toward the rear lower part of the vehicle body, and an upper end portion of the guide groove member 10. The pivot 6 is pivotally supported. On the other hand, an elevating plate 11 extending in the entire width direction is accommodated in the dust throwing box 5, and above and below the elevating plate 11 along the inner wall of the guide groove member 10. A guide roller 12 that is fitted so as to be freely rotatable is pivotally attached. Further, a pivot 13 is pivotally supported on the upper back of the lift plate 11 via a bracket 14, and the pivot 13 is along the back of the guide groove member 10 and matches the sliding distance of the lift plate 11. Thus, it protrudes outward from the inside of the dust input box 5 beyond the notch 5a formed on the side wall of the dust input box 5.

  As shown by a broken line in FIG. 5, a pair of lifting hydraulic cylinders 15 is provided along the inclination direction of the guide groove member 10 between the pivot 13 protruding outward and the lower outer side of the dust box 5. The lifting plate 11 is reciprocated in the vertical direction along the guide groove member 10 by the expansion / contraction operation of the lifting hydraulic cylinder 15.

  Further, at the lower end of the elevating plate 11, a pushing plate 16 extending over the entire width direction of the dust throwing box 5 is pivotally supported by a pivot 17 so as to swing back and forth. A pair of pushing hydraulic cylinders 19 are connected between the support piece 18 protruding rearward and the pivot 13 at the tip of the lifting hydraulic cylinder 15, and the pushing plate is expanded and contracted by the pushing hydraulic cylinder 19. 16 is swung back and forth about the pivot 17. Then, the pushing plate 16 is reversed from the clogged end state (position (a) in FIG. 5) (pushing position (b) in FIG. 5) by the cooperation of the pushing hydraulic cylinder 19 and the lifting hydraulic cylinder 15 and pushed. By moving to crushing (position (c) in FIG. 5) and compression (position (d) in FIG. 5) and returning to the position (a) in FIG. 5 again, dust is packed in the dust container 4 Yes.

  A discharge plate 20 is movably provided in the dust storage box 4, and the dust storage box 4 is a front side (rear side of the vehicle body) that stores the dust packed by the dust packing device 9 through the dust packing port 3. ) In the dust storage space 4a and the back space 4b thereof are partitioned by the discharge plate 20, and the discharge plate 20 is moved in the longitudinal direction of the vehicle body at the bottom of the back space 4b to discharge the dust. A discharge cylinder driving hydraulic cylinder (discharge hydraulic cylinder) 21 is provided. The discharge hydraulic cylinder 21 includes a base 21a, a first piston 21b that can expand and contract with respect to the base 21a, a second piston 21c that can expand and contract with respect to the first piston 21b, and a second piston 21c. This is a three-stage hydraulic cylinder including a third piston 21d that can be expanded and contracted. The base end of the base portion 21a is pivotally supported by a pivot shaft 23 on a bracket 22 provided below the discharge plate 20, and the tip end of the third piston 21d is the innermost portion of the back space 4b. Is pivotally supported by a pivot 25 on a mounting member 24 attached to the shaft. When the discharge hydraulic cylinder 21 is extended, the discharge plate 20 is brought close to the dust filling port 3 of the dust storage box 4 to minimize the volume of the dust storage space 4a, while the discharge hydraulic cylinder 21 is discharged. By contracting, the volume of the dust accommodating space 4a is increased.

  Next, an outline of the hydraulic circuit of the garbage truck will be described with reference to FIG.

  In FIG. 1, 26 is a traveling engine, 27 is a power take-out device (PTO) that takes out the power of the running engine 26, and 28 is a first hydraulic pump that is driven by the power take-out device (PTO) 27. The first hydraulic pump 28 discharges the hydraulic oil in the oil reservoir 29, and the discharged oil returns to the oil reservoir 29 through the electromagnetic control valve 30 of the dust clogging device 9, and passes through the electromagnetic control valve 30 to raise and lower the hydraulic cylinder 15. The hydraulic pressure is supplied to the pushing hydraulic cylinder 19 and the discharging hydraulic cylinder 21 so that the dust container 4 is filled with dust. The first hydraulic pump 28 is provided with a second hydraulic pump 31 in parallel. The second hydraulic pump 31 is driven by a separate engine 32 as a separate drive source installed in the chassis 2 separately from the traveling engine 26. The second hydraulic pump 31 and the separate engine 32 are accommodated in a sealed sound insulation box 33 so that the operating sound does not leak to the outside. As shown in FIGS. 1 and 2, the cab 1 and the dust container 4 It is installed in the chassis 2 between.

  As a feature of this embodiment, on the discharge side of the second hydraulic pump 31, an electromagnetic switching valve 34 as a hydraulic pressure supply switching means is interposed. The electromagnetic switching valve 34 is demagnetized when the traveling state shifts from the traveling state to the traveling stop state, and allows the hydraulic pressure supply from the second hydraulic pump 31 to the dust filling device 9. FIG. 1 shows a demagnetized state (running stop state) of the electromagnetic switching valve 34. In this demagnetized state, the second hydraulic pump 31 discharges the hydraulic oil in the oil reservoir 29, and the discharged oil is electromagnetically controlled by the dust filling device 9. The valve 30 is returned to the oil reservoir 29, and the hydraulic pressure is supplied to the elevating hydraulic cylinder 15, the pushing hydraulic cylinder 19, and the discharging hydraulic cylinder 21 via the electromagnetic control valve 30, and the dust container 4 is filled with dust. ing. Further, in this traveling stop state, naturally, the dust clogging device 9 is also operated by driving the first hydraulic pump 28, and which one to select the hydraulic system depends on the work situation at that time or the like. It is determined accordingly. On the other hand, the electromagnetic switching valve 34 is energized in the running state, forcibly restricts the hydraulic pressure supply from the second hydraulic pump 31 to the dust clogging device 9, and the lifting hydraulic cylinder 15 and the pushing hydraulic cylinder. 19 and the discharge hydraulic cylinder 21 are prevented from being supplied with hydraulic pressure. The traveling state may be determined by detecting a parking brake release signal, for example.

  Thus, in this embodiment, the dust clogging device 9 is operated by the hydraulic pressure from the first hydraulic pump 28 driven by the traveling engine 26 and installed in the chassis 2 separately from the traveling engine 26. In the refuse collection vehicle in which the dust clogging device 9 is also operated by the hydraulic pressure from the second hydraulic pump 31 driven by the separate engine 32, the hydraulic pressure supply from the second hydraulic pump 31 to the dust clogging device 9 is performed. In the traveling state, the electromagnetic switching valve 34 is excited and forcibly regulated, while in the traveling stop state, the electromagnetic switching valve 34 is demagnetized and allowed. Therefore, since the hydraulic pressure is not supplied from the second hydraulic pump 31 to the dust filling device 9 in the traveling state, the dust filling device 9 does not operate, and it is possible to prevent a dangerous flushing operation during traveling. On the other hand, since the hydraulic pressure is supplied from the second hydraulic pump 31 to the dust clogging device 9 when the traveling state is shifted from the traveling state to the traveling stop state, in a place where low noise is required, the traveling noise generating a loud engine noise is generated. The engine 26 is stopped, and the dust collecting operation can be performed by the separate engine 32 that is generally lower in sound than the traveling engine 26.

  Further, since the separate engine 32 and the second hydraulic pump 31 are housed in the hermetic sound insulation box 33, it is possible to prevent the operating sound generated from them from leaking to the outside and to further reduce noise. .

  FIG. 2 shows another embodiment. In this embodiment, the hydraulic pressure supply switching means is constituted by the electric circuit 35 of the separate engine 32, and an electric signal during traveling is sent to the electric circuit 35 of the separate engine 32. In this case, the separate engine 32 is not operated, and the hydraulic pressure supply from the second hydraulic pump 31 to the dust clogging device 9 is forcibly restricted in the traveling state, but when the traveling state is shifted to the traveling stopped state. The separate engine 32 is operated to allow the hydraulic pressure supply from the second hydraulic pump 31 to the dust filling device 9. Other than that, the configuration is the same as in the above-described embodiment, and therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. Therefore, in this embodiment, the same operational effects as the above embodiment can be obtained.

  In both the above embodiments, the engine is employed as the separate drive source, but an electric motor may be used.

  The present invention is useful as a garbage collection vehicle in which a separate hydraulic unit is installed separately from the traveling engine.

It is the schematic of the hydraulic circuit of the garbage truck which concerns on one Embodiment. It is the schematic of the hydraulic circuit of the garbage truck which concerns on another embodiment. It is a side view of the refuse collection vehicle which concerns on one Embodiment. It is a top view of the garbage truck which concerns on one Embodiment. It is a vertical side view of a dust collection box and a dust input box.

Explanation of symbols

2 Chassis (car body)
4 Dust storage box 9 Dust filling device 26 Traveling engine 28 First hydraulic pump 31 Second hydraulic pump 32 Separate engine (separate drive source)
33 Sealed sound insulation box 34 Electromagnetic switching valve (hydraulic supply switching means)
35 Electric circuit (hydraulic supply switching means)

Claims (2)

A first hydraulic pump driven by a traveling engine;
A separate drive source installed on the vehicle body separately from the above-mentioned traveling engine;
A second hydraulic pump driven by the separate drive source;
A dust stuffing device which is operated by the hydraulic pressure supplied from the first hydraulic pump or the second hydraulic pump and stuffs the dust into a dust container mounted on the vehicle body;
Hydraulic supply from the second hydraulic pump to the dust clogging device is forcibly restricted in the traveling state, and is provided with a hydraulic supply switching means that is allowed when the traveling state is shifted to the traveling stopped state. Characteristic garbage truck. In the refuse collection vehicle according to claim 1,
The garbage collection vehicle, wherein the separate drive source and the second hydraulic pump are housed in a sealed sound insulation box.

Images