JPH0716728Y2 - Sweeping brush ground load increase device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground load increasing device for a sweeping brush for road surface cleaning.

[0002]

2. Description of the Related Art In a conventional road cleaning vehicle, a sweeping brush is supported between left and right suspension arms on the rear of the chassis so as to positively rotate, and the suspension arm has its own weight (when a new brush is used). Is heavy and becomes lighter when worn), and a brush lifting cylinder for changing the ground load of the sweeping brush depending on the amount of dust on the road surface is provided between the chassis and the chassis (Japanese Patent Laid-Open No. 1-315508). Etc.).

[0003]

In the above-mentioned conventional technique, the maximum grounding load of the sweeping brush is the brush's own weight, but the sweeping brush worn up until just before replacement has a considerable own weight.
Moreover, the rigidity of the filaments that make up the brush increases due to abrasion, so if there is a deep loop on the road surface, the filament will not reach the bottom of the loop and will remain unswept.

[0004]

[Means for Solving the Problems] This invention is applied to the case where there is a loop on the road surface, and especially when the brush weight is reduced, the sweeping brush is grounded so as not to cause unswept bottom to the bottom of the loop. In order to provide a load increasing device,
In a road surface cleaning vehicle that supports the suspension arms to the left and right of the rear part of the chassis so as to swing up and down, and supports the sweeping brush to positively rotate between the left and right suspension arms. The sweeping brush is positively pressed in the ground contact direction, and a load applying device that can be released is provided, and the operating means is provided for switching the load applying device between the operating state and the non-operating state.

[0005]

According to the above, when the unswept portion is generated in the wheel shed on the road surface, the operating means is switched to positively press the sweeping brush toward the ground by the load applying device. In addition to its own weight, a load is applied to the sweeping brush by a load applying device, and even if the rigidity of the filament of the brush is increased, the brush is pressed to the bottom of the ring so that no sweeping residue occurs. Further, even if the sweeping brush is worn on a road surface without loops, when it is not necessary to press the sweeping brush with an extra force, the load applying device is switched to the inoperative state by the operating means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, one end of a suspension arm 3 is pivotally supported in the vertical direction on the left and right of a rear portion of a chassis 2 of a road cleaning vehicle 1. A sweeping brush 4 having a large number of filaments 4a radially is rotatably supported between the ends of the left and right suspension arms 3, and is rotated in the arrow direction by a hydraulic motor 5 connected to a brush shaft 4b. The dust on the road surface 6 swept up to the center of the chassis 2 is swept up to the elevator 7 by a side brush (not shown) in front of the chassis 2.

One end of a pulling cylinder 10 is pivotally attached to the left and right chassis portions corresponding to the suspension arms 3. The pin 11 at the tip of the piston rod 10a of the lifting cylinder 10 is guided along the guide elongated hole 13 of the bracket 12, and one end of the connecting lever 14 is rotatably pivotally attached to this pin 11 and the other end of the connecting lever 14 is provided. A tension spring 15 is interposed between the suspension arm 3 and the middle of each suspension arm 3 in the longitudinal direction. As shown in FIG. 2, the lifting cylinder 10 is connected by piping so that the lifting force can be changed by the action of the pressure adjusting valve 20, and the lifting force is adjusted according to the weight of the sweeping brush 4 and the amount of dust on the road surface. However, the sweeping brush 4 is grounded to the road surface 6 with an appropriate grounding load that is smaller than the own weight of the sweeping brush 4 by the pulling force.

Chassis 2 corresponding to left and right suspension arms 3
One end of a hydraulic pressing cylinder 16 as a load applying device is pivotally attached to the left and right parts of the shaft in a vertically swingable manner. The tip of the piston rod 17 of the pressing cylinder 16 is rotatably pin-connected to the upper side of the suspension arm 3. The left and right pressing cylinders 16 are connected by piping so that hydraulic pressure is supplied to the head side cylinder chamber 16a, and the pressure thereof is adjusted by the pressure adjusting valve 21. The hydraulic oil supply / discharge line 22 to the pulling cylinder 10 and the hydraulic oil supply / discharge line 23 to the pressing cylinder 16 are connected to a hydraulic pump 25 via an electromagnetic switching valve 24.
And to the tank 26. The electromagnetic switching valve 24 is switched by a toggle switch 27 provided in the driver's seat of the road cleaning vehicle 1, and the toggle switch 27 and the electromagnetic switching valve 24 constitute an operating means 30 for switching the pressing cylinder 16 between operating and non-operating. To be done. Incidentally, 28 is the hydraulic pump 2
It is an engine that drives the 5.

When there is no wheel sheave 40 on the road surface 6 or when the sweeping brush 4 is new and is not worn so much, the head side cylinder chamber 16a of the pressing cylinder 16 is provided.
Is connected to the tank 26, the piston rod 17 is movable in the axial direction, and the electromagnetic switching valve 24 is switched so that the pressure oil from the hydraulic pump 25 is supplied only to the pulling cylinder 10. The pressure of the pressure oil is adjusted by the pressure adjusting valve 20 so that the pulling force of the pulling cylinder 10 can obtain a predetermined ground load depending on the weight of the brush and the amount of dust on the road surface 6. When the sweep-up brush 4 is new, the filament 4a is long and its rigidity is weak, so that the loop 4 is formed on the road surface 6.
Even if there is 0, the filament 4a reaches the bottom of the ring 40 only by adjusting the ground load and there is no unswept residue. Further, even when the sweeping brush 4 is worn, when the road surface 6 is flat, sufficient road surface cleaning can be performed only by adjusting the ground load.

If the sweeping brush 4 is worn away and the rigidity of the filament 4a becomes stronger, and if there is a loop, even if the pulling force is released and all the brush's own weight is applied to make contact with the ground, as shown in FIG. The filament 4a does not bend,
An unswept residue occurs without entering the ring 40. In such a case, the toggle switch 27 is used to switch the electromagnetic switching valve 24 so that the pressure oil supply / discharge pipe line 22 communicates with the tank 26 and the pressure oil supply / discharge pipe line 23 communicates with the hydraulic pump 25.
The piston rod 10a is movable in the axial direction, and the piston rod 17 of the pressing cylinder 16 is projected. Then, the suspension arm 3 is pushed downward, and the sweeping brush 4 is released from the pulling force by the pulling cylinder 10, and the road surface 6 is subjected to the ground load combined with the brush's own weight and the pushing force by the pushing cylinder 16. Pressed against. The pressing force by the pressing cylinder 16 is set in advance by the pressure adjusting valve 21 so that the filament 4a of the sweeping brush 4 which has worn due to the combined ground load reaches the inside of the wheel 40 having a predetermined depth. As a result, the sweeping brush 4 enters the ring 40 as shown in FIG. When the depth of the ring 40 changes, the pressure may be adjusted accordingly. If the road surface 6 becomes flat, it is not necessary to increase the ground load, so the pressing cylinder 16 is deactivated by the toggle switch 27, and only the pulling cylinder 10 is operated.

In this embodiment, the load applying device is constituted by the hydraulic cylinder. However, the shaft that swingably supports the suspension arm 3 on the chassis 2 is integrated with the suspension arm 3, and the shaft is rotated. The load applying device may be configured by a hydraulic torque motor.

[0012]

As described above, according to the device of this invention,
If a sweeping brush is left uncleaned in the road surface during road surface cleaning, the load applying device can be activated to positively push the sweeping brush toward the ground. Even if the filament has a high rigidity, the filament can be pressed to the bottom of the ring and there is no leftover residue. Further, since the load applying device is switched between the operating state and the non-operating state by switching the operating means, it is possible to prevent the load applying device from operating on a road surface having no wheelchair so that an excessive ground load is not applied and the brush wear is reduced. There is an advantage that can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a supporting portion of a sweeping brush.

FIG. 2 is a hydraulic circuit diagram.

FIG. 3 is an operation explanatory diagram.

FIG. 4 is an operation explanatory diagram.

[Explanation of symbols]

1 road cleaning car, 2 chassis, 3 suspension arms,
4 sweeping brush, 16 pressing cylinder (load applying device), 30 operating means

Claims (1)

[Scope of utility model registration request] 1. A road surface cleaning vehicle in which a suspension arm is supported on the left and right of the rear part of the chassis so as to be swingable up and down, and a sweeping brush is supported so as to positively rotate between the suspension arms. A sweeping brush comprising: a pressing means for positively pressing the sweeping brush between the chassis and the chassis in a grounding direction; and a load applying device which can be released, and an operating means for switching the load applying device between operating and non-operating. Ground load increase device.