JPH0535140Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a gutbloom support device for a road cleaning vehicle, and more specifically, to a structure that reduces changes in the ground load between the guttab bloom and the road surface during work.

BACKGROUND ART Conventionally, a structure for changing the ground contact load between the Gatsuta Bloom and the road surface during work as described above is disclosed, for example, in Japanese Patent Publication No. 59-501791. This structure will be explained with reference to FIG. According to this, chassis 101
A grooved brush 10 is attached to the tip of a vertical shaft 102 fixed to
A cylindrical boss portion 105 of a grooved brush arm 104 having a groove brush arm 104 is fitted therein so as to be rotatable and movable up and down. One end of a cable 106 is connected to this grooved brush arm 104, and the other end of this cable 106 is connected to a yoke 108 of a spring device 107. In the spring device 107, a compression spring 112 is interposed between a yoke rear end 109 and a piston rod 111 of a hydraulic cylinder 110 fixed to the chassis 101, and the spring load applies an upward pulling force to the grooved brush arm 104. is giving. Therefore, piston rod 1
Depending on the amount of protrusion 11, the load by the spring is changed and the above-mentioned pulling force is changed. Hydraulic cylinder 11
A pilot operated check valve 114 is connected to the switching valve 113 connected to the pump 115 in the supply and discharge ports before and after the piston rod 11.
After adjusting the protrusion amount in step 1, the pressure oil is blocked.

Problems to be Solved by the Invention According to the above, when the piston rod 111 is moved so that the pulling force by the spring 112 becomes F, the ground load of the guttab bloom 103 is equal to the dead weight of the guttab bloom 103, the dead weight of the groove brush arm 104, etc. , the total weight of the object suspended on the vertical axis 102 minus this pulling force F. Now, during the road cleaning work, the guttabloom 103 is lowered due to the undulations of the road surface, and the cable 106 is lowered.
When the piston rod 111 is pulled out by δ, the piston rod 111 is not pulled out because the cylinder chamber of the hydraulic cylinder 110 is blocked by the check valve 114, and the spring 112 is compressed by δ. As a result, spring 1
12 increases by an amount corresponding to this contraction δ, and the ground load decreases compared to before the descent. When the ground load decreases in this way, unswept spots and the like occur.
Conversely, when the guttabloom 103 rises, the pulling force decreases and the ground load increases. Such an increase in the ground load causes the guttab bloom 103 to wear out more quickly.

The problem with this invention is to keep the increase and decrease in the ground load of the guttabloom due to the undulations of the road surface to a minimum.

Means for Solving the Problems In order to solve the above problems, this invention suspends the Gatsuta Bloom so that it can move vertically and horizontally via a suspension device, and moves the Gatsuta Bloom between the working position and the storage position. In the road cleaning vehicle configured to be moved, a cylinder device for setting the ground load of the gutta bloom is connected between the suspension device and the chassis, and this cylinder device includes a piston rod that moves in the axial direction within the cylinder body, and a piston rod that moves in the axial direction within the cylinder body. It is characterized by comprising a piston that is axially movable with respect to the cylinder body, and a spring that is interposed between these pistons and the piston rod and biases the piston rod toward the head.

Effect According to the above, in response to the undulations of the road surface, the piston rod of the cylinder device is pushed or pulled relative to the cylinder body by an amount (for example, δ) corresponding to the undulations. Then, the volume of the cylinder chamber on the rod side within the cylinder body changes by the product of this amount of displacement and the cross-sectional area of the piston rod. Corresponding to this volume change, the piston is displaced, for example, by ε in the direction in which the load is applied, relative to the cylinder body. As a result, although the piston rod was displaced by δ, the spring was only displaced by δ-ε, and the pulling force by the spring was
Can be kept small.

Embodiment In FIGS. 1 to 3, a support shaft 2 is fixed to a chassis 1. A suspension device 4 for a guttabloom 3 is attached to the support shaft 2 so as to be horizontally swingable. In this suspension device 4, upper and lower support arms 7a,
7b protrudes, and these supporting arms 7a, 7b are rotatably attached to the support shaft 2. As shown in FIG. 2, an extrusion cylinder 8 for horizontally swinging the suspension device 4 is connected between the tip of the lower support arm 7b and the chassis 1. A pair of left and right upper support parts 9, 9 are provided on the upper back surface of the board 6, and a pair of left and right lower support parts 10, 10 are provided on the lower front surface. One end of a support rod 11 is supported between the upper support parts 9 by a pin 12 so as to be vertically swingable. A lower support arm 13 is attached to the lower support portions 10, 10.
One end is supported by a pin 14 so as to be able to swing vertically. The other end of the lower support arm 13 is rotatably connected between the lower support portions 16 of the tilt bracket 15 by a pin 17. Tilt bracket 15
A pivot pin 19 is rotatably supported between the upper support portions 18, 18, and the other end of the support rod 11 is inserted into a through hole 19a of the pivot pin 19 so as to be movable in the axial direction. be. A seat 20 is loosely fitted to the support rod 11 at the front and rear of the rotation pin 19 so as to be movable in the axial direction. This seat 20 and support rod 11
A spring 22 is interposed between the washer 21 and the washer 21 fixed to the holder. There is an adjustment nut 2 at the tip of the support rod 11.
3 are screwed together, and the adjustment nut 23 is tightened by the force of the spring 22.
is in pressure contact with the rotating pin 19 via the seat 20. In this way, the parallel link mechanism consisting of the support rod 11, the support bracket 5, the lower support arm 13, and the tilt bracket 15 allows the tilt bracket 15 to move up and down with respect to the support bracket 5 without changing its vertical angle. tilt bracket 1
A hydraulic motor 26 is fixed to the upper surface of a support block 24 which rotatably supports the gutter broom 3 on the back of the rotor 5 (on the right side in FIG. 1), with a plate 25 in between. A rotating shaft 26a of this hydraulic motor 26 is connected to the gutta broom 3. An L-shaped lever 27 shown in FIG. 3 is fixed to the front surface of the support block 24. A pivot 28 protruding from the tilt bracket 15 on the side of the rotating shaft 26a of the hydraulic motor 26 is inserted through the L-shaped lever 27 and the support block 24, and the L-shaped lever 27 is swung along with the gutta broom 3 in the left-right direction of the chassis 1. It is supported so that it can move freely. L
A vibration damper 29 is connected between one end of the lever 27 and the tilt bracket 15 to damp the swinging of the support block 24 about the pivot shaft 28. A lifting chain 30 is connected to the plate material 25, and when the Gatsuta broom 3 is not in use,
The lifting chain 30 is hoisted up and lifted to the storage position A shown by the two-dot chain line in FIG. Further, an arcuate hole 3 is provided at the upper end of the L-shaped lever 27.
1 is formed, and a locking pin 32 on the rear surface of the tilt bracket 15 is fitted into this arcuate hole 31, and when the gutter broom 3 is lifted by the lifting chain 30, the L-shaped lever 27 rotates about the pivot 28. It's starting to stop. In this way, the Gatsuta broom 3 is located below the chassis 1 by the hoisting and unwinding of the lifting chain 30 and the operation of the extrusion cylinder 8, and is located at the storage position A where it does not clean the road surface.
and a work position B which protrudes to the side of the chassis 1 and cleans the road surface.

Next, the support bracket 5 of the suspension device 4 is integral with the chassis 1 in the vertical direction because it does not move up and down, and also serves as a part of the chassis 1. A head side end of a cylinder device 33 is rotatably connected to the upper support portions 9, 9 of the support bracket 5 below the support rod 11 by a pin 34. Further, a U-shaped connection part 35 is fixed to the middle part of the lower support arm 13, and this connection part 35
The tip of a piston rod 36 of the cylinder device 33 is rotatably connected to a pin 35a. In this way, the cylinder device 33 is connected in the vertical direction between the support bracket 5 integral with the chassis 1 and the lower support arm 13 that swings up and down. This cylinder device 33
As shown in FIG. 4, a cylindrical piston 41 that is open toward the rod is fitted in a cylinder body 40 consisting of a head, rod caps 37, 38, and a cylinder tube 39 so as to be freely slidable in the axial direction. Inside this piston 41 is a piston rod 36.
The rear end of the piston rod 36 is located at this position, and the tip of the piston rod 36 is made to protrude from the cylinder body 40. A seat 42 is fixed to the rear end of the piston rod 36. This catch 42 and piston 4
Collar 4 secured to 1 with snap spring 43
A compression spring 45 is interposed between the piston rod 36 and the piston rod 36, and constantly urges the piston rod 36 toward the head side (leftward in FIG. 4). The front cylinder chamber 46 defined by the piston 41 has a flow path type APB.
The pump 48 is connected to a pump 48 via a type of electromagnetic switching valve 47. A pressure gauge 49 is connected in the middle of the piping, and its display can be monitored from the driver's seat. Further, the rear cylinder chamber 50 is directly connected to a tank 51. This cylinder device 33
The pressure of the pressure oil supplied to the Gatsuta Bloom 3 varies depending on the amount of dust, when it is new, when it is slightly worn due to work, when it is worn to the point of replacement, and when it is used for light work when there is little dust. Medium work with normal dust, heavy work with a lot of dust,
It changes depending on the level of work. In other words, when the weight of the guttab bloom 3 is the same, the distance between the pin 34 and the pin 35a is constant if the road surface height is constant. Therefore, by changing the pressure as described above, the piston 41 relative to the piston rod 36 is The pulling force of the lower support arm 13 generated by the piston rod 36 is adjusted by changing the position of the spring 45 and the amount of compression of the spring 45.

According to such a structure, the guttab room 3 at the storage position A is positioned above the working position B by protruding the piston rod of the extrusion cylinder 8, and
The lifting chain 30 is rewound and lowered onto the road surface. At this time, the electromagnetic switching valve 47 is switched to adjust the pressure of the pressure oil to the cylinder device 33 depending on the degree of wear of the guttab bloom 3 and the amount of dust on the road surface, and the pressure gauge 49 on the driver's seat indicates that the pressure has reached the predetermined pressure. monitor and switch the electromagnetic switching valve 47 to the neutral position,
The front cylinder chamber 46 of the cylinder device 33 is blocked. As a result, the spring 4 inside the cylinder device 33
5 is compressed and lifts the lower support arm 13 with a predetermined lifting force. Therefore, part of the weight of the gutter broom 3, the hydraulic motor 26, etc., and the suspension device 4 is applied to this cylinder device 33, and a part of the lower surface of the gutter broom 3 is installed on the road surface with a predetermined installation load. Then, the hydraulic motor 26 is driven to perform cleaning. Now, a case will be explained in which a part of the road surface collapses during cleaning. In FIG. 5, the guttab broom 3 descends from the road surface GR1 that it has been cleaning up to now to the road surface GR2, and the piston rod 36 is pulled downward and protrudes from the cylinder body 40, so that the distance between the pins 34 and 35a increases before descending. (e.g., δ). This piston rod 3
Due to the protrusion of 6, the volume of the piston rod 36 occupying the front cylinder chamber 46 of the cylinder body 40 is
It decreases by the amount that stands out. Pressure oil is blocked in the front cylinder chamber 46, and the piston 41 moves forward by a predetermined amount (epsilon, for example) corresponding to this volume reduction and then stops. In this way, the amount of compression of the spring 45 becomes δ-ε, and the actual piston rod 36
It is smaller than the amount of protrusion. In other words, the increase in the pulling force can be made smaller than when only the spring 45 is used, and the fluctuation in the pulling force when descending in this way can be suppressed to a small level. On the other hand, when the guttabloom is pushed up from the road surface it has been cleaning, the opposite effect is performed. In this way, even if the road surface is uneven, fluctuations in the pulling force can be made smaller than in the case of suspension using only springs, so dust left unswept by the gutter broom 3 and abrasion of the gutter broom 3 can be suppressed.

In addition, instead of the above-mentioned suspension device 4 using parallel links, a suspension device 4 as described in the above-mentioned conventional technology may be used.
may also be used.

Effects of the Invention As described above, according to the gutter bloom support device of this invention, the piston rod, the piston, and the cylinder body each move the cylinder device that applies a lifting force to the gutter bloom so that a predetermined installation load is generated in the axial direction relative to each other. It has a movable structure, and a spring is interposed between the piston rod and the piston to bias the piston rod toward the head, so that the displacement of the piston rod caused by the lowering and raising of the gutter broom due to the unevenness of the road surface does not become a spring displacement. Can be made smaller. Therefore, the change in the pulling force due to the spring can be kept small,
It has the advantage of reducing changes in ground load and reducing the amount of dust left behind due to guttabloom.

[Brief explanation of drawings]

Fig. 1 is a side view showing the Gatsuta Bloom in a suspended state, Fig. 2 is a plan view showing the retracted state in Fig. 1, Fig. 3 is a perspective view of Fig. 1, and Fig. 4 is an enlarged sectional view of the cylinder device. , FIG. 5 is an explanatory diagram of the operation, and FIG. 6 is a conventional technique. 1...Shayashi, 3...Gatsuta Bloom, 4...
...Suspension device, 33...Cylinder device, 36...Piston rod, 41...Piston, 40...Cylinder body, 45...Spring.

Claims (1)

[Scope of utility model registration request] A road cleaning vehicle in which a gutter broom is suspended from a chassis via a suspension device that can move vertically and horizontally, and the gutter broom is moved between a working position and a storage position. A cylinder device for setting the ground load of the gutta bloom is connected between the device and the chassis, and this cylinder device includes a piston rod that moves in the axial direction within the cylinder body, a piston that is freely movable in the axial direction with respect to the piston rod and the cylinder body, A gutter broom support device for a road cleaning vehicle characterized by comprising a spring interposed between the piston and the piston rod to urge the piston rod toward the head side.