JP3856909B2 - Cleaning device support mechanism for cleaning vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support mechanism for a cleaning device of a cleaning vehicle.
[0002]
[Prior art]
As shown in FIG. 8, a quick coupler frame 104 is attached to the tip of the lift arm 102 and the tilt link 103 of the cleaning vehicle 100 by a coupler pivot shaft 105 and a tilt shaft 106 on the cleaning device support mechanism of the cleaning vehicle. The cleaning device 110 is pivotally supported by the quick coupler pins 111 on both the left and right sides of the frame 104 so as to be able to tilt forward and backward. A hook receiving shaft 113 is provided on the quick coupler frame 104, and the cleaning device 110 is engaged with the hook receiving shaft 113. There is a hook 112 that restricts forward and backward tilting of a predetermined angle or more, and a one-way throttle valve is provided in the return side hydraulic circuit when the lift cylinder 107 that raises and lowers the lift arm 102 is lowered. No. 34780).
[0003]
When the cleaning device 110 located at a position separated from the ground G is grounded by the cleaning device support mechanism, the operator operates the lift control lever 115 to lower the lift arm 102 and the cleaning device 110 comes near the ground G. At times, the tilt cylinder 109 is expanded and contracted before being brought into contact with the ground so as to be in an appropriate forward tilt state. When the lift arm 102 is further lowered from here, the front caster 121 of the cleaning device 110 is first grounded. If the lowering of the lift arm 102 is continued, the cleaning device 110 that has been tilted forward tilts with the quick coupler pin 111 as a fulcrum and eventually becomes parallel to the ground G, so that the caster 122 comes into contact with the ground.
[0004]
In the grounded state, the hook 112 of the cleaning device 110 leaves the hook receiving shaft 113 of the quick coupler frame 104 and is located in a play range in which the cleaning device 110 can freely tilt forward and backward by a predetermined angle.
[0005]
The return side hydraulic circuit at the time of lowering of the lift cylinder 107 that raises and lowers the lift arm 102 is provided with a one-way throttle valve so that the operator releases the lift control lever 115 from the hydraulic restriction of the lift cylinder 107. When operated to the “float” position, the cleaning device 110 descends at a safe speed due to its own weight, and contacts the ground without receiving an impact load.
[0006]
When the cleaning operation is performed, the operator operates the lift control lever 115 to the “float” position, so that the lift arm 102 freely rotates about the arm pivot 108, so that the cleaning device 110 changes in the height of the ground. Furthermore, since the cleaning device 110 can tilt back and forth within the range of play between the hook 112 and the hook receiving shaft 113, the cleaning device 110 tilts following changes in the inclination of the ground to be cleaned and unevenness.
[0007]
The cleaning device 110 collects the dust on the ground G in the dust box 126 with the rotary brush 129, and the collected dust lifts the cleaning device 110 with the lift arm 102, opens the dust box 126, and serves as a truck bed or a garbage dump. discharge.
[0008]
[Problems to be solved by the invention]
However, in the conventional cleaning device support mechanism of the cleaning vehicle 100, when the cleaning device 110 is grounded, when the cleaning device 110 comes close to the ground, the tilt cylinder 109 is expanded and contracted to bring it into an appropriate forward tilt state before grounding. There is a need.
[0009]
If the hook receiving shaft 113 of the quick coupler frame 104 is not positioned substantially in the center of the play range with the hook 112 on the cleaning device 110 side while the cleaning device 110 is in contact with the horizontal ground G, the ground to be cleaned is used. Sufficient follow-up cannot be achieved by the tilting of the cleaning device 110 with the quick coupler pin 111 as a fulcrum in response to changes in the forward and backward tilts of G. Therefore, even after the cleaning device 110 is grounded, the operator needs to adjust the position of the hook receiving shaft 113 of the quick coupler frame 104 by operating the tilt cylinder 109 to expand and contract while looking at the mark.
[0010]
Further, when discharging the dust accumulated in the dust box 126 to a truck bed or the like, when the cleaning device 110 is raised to a high position by the lift arm 102, the cleaning device that has been tilted forward by operating the tilt cylinder 109 is used. The operation which raises 110 horizontally is needed.
[0011]
As described above, in the cleaning operation in which the cleaning and the discharge of dust are repeated, the operator must operate the tilt cylinder 109 each time to adjust the inclination of the cleaning device, so that the efficiency of the operation is poor.
[0012]
In addition, since the cleaning device 110 is attached to the tip of the lift arm 102 and the tilt link 103 via the quick coupler frame 104, the overall length of the cleaning vehicle 100 when the cleaning device 110 is lifted by the lift arm 102 and travels is increased. , Turning radius is large and small turning is not possible. In addition, there is a problem that it is necessary to make the balance weight 114 behind the cleaning vehicle 100 heavy in order to ensure stability during traveling.
[0013]
The present invention solves such a problem in a cleaning device support mechanism of a cleaning vehicle. In a cleaning operation in which cleaning and dust discharge are repeated, the operator operates the tilt cylinder each time the cleaning device is lifted and lowered. It is an object of the present invention to provide a cleaning device support mechanism for a cleaning vehicle that can appropriately follow changes in the inclination of the ground during cleaning, and can shorten the overall length of the cleaning vehicle. And
[0014]
[Means for Solving the Problems]
According to the present invention, in a cleaning device support mechanism of a cleaning vehicle including a lift arm having a cleaning device connected to a tip portion and a lift cylinder for raising and lowering the lift arm, when the cleaning device is in the vicinity of the ground, the cleaning device is appropriately moved forward. A tilt link is provided to hold the cleaning device in a horizontal state when the cleaning device is in a position separated from the ground , and one of the fulcrum of the tilt link makes the cleaning device tiltable back and forth within a predetermined angle range. It shall be the long hole bonds.
[0015]
Also, provision of the one-way throttle valve falling time of the return-side hydraulic circuit of the lift cylinder for raising and lowering the Li Futoamu.
[0016]
When the cleaning device is grounded, when the lift arm is lowered, the cleaning device enters a proper forward tilt state by the tilt link when it reaches the vicinity of the ground. In this state, the front end side of the cleaning device is grounded first, and then the cleaning device is tilted rearward to become horizontal and to the rear end. Since the cleaning device is tiltable back and forth within a predetermined angle range, it can follow changes in the inclination of the ground to be cleaned when performing a cleaning operation. When discharging the dust from the cleaning device to a truck bed or the like, if the cleaning device is raised to a position separated from the ground by a lift arm, the cleaning device is held in a horizontal state by a tilt link. Therefore, the operator does not need to adjust the inclination angle of the cleaning device each time.
[0017]
In addition, a one-way throttle valve is provided in the return side hydraulic circuit when the lift cylinder is lowered to raise and lower the lift arm, so that the operator can operate the lift control lever to the “float” position where the lift cylinder hydraulic restraint is released. For example, the cleaning device descends at a safe speed due to its own weight, contacts the ground without receiving an impact load, and when entering the cleaning operation, the lift arm rotates freely about the arm pivot of the cleaning vehicle. Even if there is a change, the cleaning device can cope with the change without receiving an excessive load.
[0018]
Since the cleaning device is directly attached to the tip of the lift arm and tilt link without going through the quick coupler frame, the cleaning vehicle has a shorter overall length, a smaller turning radius, and a small turn, so that the cleaning device can be moved forward from the front shaft of the cleaning vehicle. The amount of protrusion is reduced, and stability during running is improved. Since the tilt cylinder and quick coupler frame are not required, the cost can be reduced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of a cleaning vehicle showing an embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram of a lift cylinder, and FIGS. 3, 4, and 5 are explanatory views of the operation of a cleaning device support mechanism during ascent / descent. 6 and 7 are explanatory views of the operation of the cleaning device support mechanism during cleaning.
[0020]
The cleaning vehicle 1 includes a driver seat 40 behind the articulated vehicle 50 based on a wheel loader, and a lift arm 2 and a tilt link 3 ahead.
[0021]
The lift arm 2 has a base end portion pivotally supported on the vehicle 50 by an arm pivot 21, and a rear end portion of the cleaning device 10 is rotatably connected to a tip end portion by a connecting shaft 22. The lift 10 is lifted and lowered by the expansion and contraction of the lift cylinder 7, and the cleaning device 10 connected to the tip is lifted and lowered.
[0022]
The tilt link 3 includes an upper link 31, an intermediate link 32, and a lower link 33, and an intermediate portion of the intermediate link 32 is pivotally attached to the lift arm 2 by a link pivot 34. The upper end of the intermediate link 32 is connected to the vehicle 50 by the upper link 31, and the lower end of the intermediate link 32 is connected to the cleaning device 10 by the lower link 33.
[0023]
A portion of the lower link 33 connected to the cleaning device 10 has a long hole 35, and the guide pin 11 fixed to the cleaning device 10 is engaged with the long hole 35. Within a predetermined angle range allowed by the length of the hole 35, the front and rear tilts of the lift arm 2 can be tilted forward and backward with the connecting shaft 22 as a fulcrum. The long hole coupling may be another fulcrum of the tilt link 3.
[0024]
When the lift arm 2 lifts the cleaning device 10 from the ground G, the tilt link 3 restricts the inclination angle of the cleaning device 10 by suppressing the movement of the cleaning device 10 that leans forward around the connecting shaft 22 due to its own weight. At this time, the guide pin 11 is in contact with the front end of the long hole 35 of the lower link 33. The relationship between the height of the connecting shaft 22 from the ground G at the tip end of the lift arm 2 and the inclination angle of the cleaning device 10 depends on the lengths of the upper link 31, the intermediate link 32, and the lower link 33 constituting the tilt link 3. It changes with the relative position of the fulcrum. Here, when the connecting shaft 22 is in the vicinity of the ground G as shown in FIG. 3, the cleaning device 10 is in a proper forward tilt state, and the connecting shaft 22 is separated from the ground G as shown in FIGS. 4 and 5. The tilt link 3 is configured so as to hold the cleaning device 10 horizontally when in the position.
[0025]
The cleaning device 10 includes a dust box 12 at a front portion, a brush frame 13 at a rear portion thereof, a front caster 14 and a rear caster 15 which are rotatable at front and rear end portions. The brush frame 13 is a housing that supports the rotating brush 16 with a brush shaft 17 and that has a lower surface and a front surface that are open. The dust box 12 is a box whose rear surface is opened, and dust D on the ground G that is swept forward by the rotation of the rotating brush 16 is input and collected. The brush frame 13 and the dust box 12 are connected by an opening / closing shaft 18, and the joint surface 20 is opened / closed by an opening / closing cylinder 19 provided between the brush frame 13 and the dust box 12.
[0026]
As shown in FIG. 2, the bottom side oil chamber 74 and the rod side oil chamber 75 of the lift cylinder 7 are connected to a hydraulic pump 72 and an oil tank 73 via a lift control valve 71. A one-way throttle valve 76 is interposed between the bottom side oil chamber 74 of the lift cylinder 7 and the lift control valve 71.
[0027]
The lift control valve 71 is a four-position manual operation switching valve. When the lift control lever 77 is operated to the “up” and “down” positions, the lift cylinder 7 expands and contracts, and the lift arm 2 moves up and down to move the cleaning device 10. Can be moved up and down. Further, by operating the lift control lever 77 to the “float” position, the bottom side oil chamber 74 and the rod side oil chamber 75 of the lift cylinder 7 communicate with the oil tank 73 and the hydraulic restriction is released. ing. The lift control lever 77 has a detent structure that is held at the “float” position.
[0028]
The one-way throttle valve 76 has a structure in which a throttle 78 and a check valve 79 are provided in parallel. From the bottom side oil chamber 74 to the oil tank 73 when the lift arm 2 is lowered, that is, when the lift cylinder 7 is reduced. The lift arm 2 can be lowered at a slow speed by reducing the flow rate of the returning hydraulic oil.
[0029]
As shown in FIGS. 4 and 5, when the cleaning device 10 is at a position separated from the ground G, the cleaning device 10 is held horizontally by the tilt link 3. At this time, the guide pin 11 fixed to the cleaning device 10 is in contact with the front end of the long hole 35 of the lower link 33.
[0030]
In order to ground the cleaning device 10 from this position, the operator operates the lift arm control lever 77 to switch the lift control valve 71 to the lowered position, and the lift cylinder 7 is reduced to lower the lift arm 2. As shown in FIG. 3, when the cleaning device 10 reaches the vicinity of the ground G, the cleaning device 10 is appropriately tilted forward by the tilt link 3. In this state, the front caster 14 is grounded first in this state, and then the rear caster 15 is grounded with the connecting shaft 22 as a fulcrum and the rear caster 15 is grounded.
[0031]
At this time, the guide pin 11 fixed to the cleaning device 10 moves backward away from the front end of the long hole 35 of the lower link 33. The amount of movement of the guide pin 11 depends on the forward tilt angle of the cleaning device 10 when the front caster 14 is grounded. By appropriately setting the forward tilt angle, as shown in FIG. The cleaning device 10 can follow the downward slope of the ground G.
[0032]
Further, by setting the length of the long hole 35 of the lower link 33 so that the guide pin 11 can move further backward from the state where the cleaning device 10 is in contact with the horizontal ground G, as shown in FIG. The cleaning device 10 can follow the upward slope of the ground G at the time.
[0033]
The cleaning device 10 is pushed and pulled by the vehicle 50 in a state where both the front caster 14 and the rear caster 15 are grounded, and cleans the ground G. At this time, when the operator operates the lift control lever 77 to the “float” position, the lift arm 2 freely rotates around the arm pivot 21 connected to the vehicle 50. In addition, the guide pin 11 moves in the long hole 35 of the lower link 33 so that the guide pin 11 can freely tilt back and forth following changes in the inclination of the floor surface to be cleaned and unevenness. To do.
[0034]
When a predetermined amount of dust D is collected in the dust box 12, the lift control lever 77 is operated to the “raised” position and the cleaning device 10 is lifted by the lift arm 2. At this time, since the pressure oil is supplied from the hydraulic pump 72 through the check valve 79 of the one-way throttle valve 76 to the bottom side oil chamber 74 of the lift cylinder 7, the cleaning device 10 can be raised at a high speed.
[0035]
The raised cleaning device 10 reduces the opening / closing cylinder 19 to open the dust box 12 and discharges the collected dust D to a truck bed, a garbage dump, etc., and then lowers the cleaning device 10 again to repeat the above operation. .
[0036]
When the operator lowers the cleaning device 10 and operates the lift control lever 77 to the “float” position, the cleaning device 10 descends at a safe speed due to its own weight, and first receives the front caster 14 and then the rear caster without receiving an impact load. 15 can be grounded, and the cleaning operation can be continued.
[0037]
【The invention's effect】
As described above, according to the cleaning device support mechanism of the cleaning vehicle of the present invention, in a cleaning operation in which cleaning and dust discharge are repeated, the operator operates the tilt cylinder every time the cleaning device is raised and lowered to adjust the inclination of the cleaning device. In addition, since the cleaning device is tiltable back and forth within a predetermined angle range, the cleaning device can follow the change in the inclination of the ground to be cleaned.
[0038]
If the operator operates the lift control lever to the “float” position where the hydraulic restraint of the lift cylinder is released by providing a one-way throttle valve in the return side hydraulic circuit when the lift cylinder lowering the lift arm is lowered, The cleaning device descends at a safe speed due to its own weight, contacts the ground without receiving an impact load, and when entering the cleaning operation, the lift arm rotates freely around the arm pivot of the cleaning vehicle, so the level of the ground changes. Even if there is, the cleaning device can cope with the change without receiving an excessive load.
[0039]
Since the cleaning device is directly attached to the tip of the lift arm and tilt link without going through the quick coupler frame, the cleaning vehicle has a shorter overall length, a smaller turning radius, and a small turn, so that the cleaning device can be moved forward from the front shaft of the cleaning vehicle. The amount of protrusion is reduced, and stability during running is improved. Since the tilt cylinder and quick coupler frame are not required, the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a cleaning vehicle showing an embodiment of the present invention.
FIG. 2 is a hydraulic circuit diagram of a lift cylinder.
FIG. 3 is an explanatory view of the operation of the cleaning device support mechanism during elevation.
FIG. 4 is an explanatory diagram of the operation of the cleaning device support mechanism during elevation.
FIG. 5 is an explanatory diagram of the operation of the cleaning device support mechanism during elevation.
FIG. 6 is an explanatory diagram of the operation of the cleaning device support mechanism during cleaning.
FIG. 7 is an explanatory diagram of the operation of the cleaning device support mechanism during cleaning.
FIG. 8 is a side view of a conventional cleaning vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cleaning vehicle 2 Lift arm 3 Tilt link 7 Lift cylinder 10 Cleaning device 11 Guide pin 12 Dust box 13 Brush frame 14 Front caster 15 Rear caster 16 Rotating brush 17 Brush shaft 18 Opening shaft 19 Opening / closing shaft 21 Arm pivot shaft 22 Connecting shaft 31 Upper part Link 32 Intermediate link 33 Lower link 34 Link pivot 35 Long hole 50 Vehicle 71 Lift control valve 72 Hydraulic pump 73 Oil tank 74 Bottom side oil chamber 75 Rod side oil chamber 76 One-way throttle valve 77 Lift control lever 78 Throttle 79 Check valve

Claims (2)

A cleaning device support mechanism for a cleaning vehicle having a lift arm connected to the tip of the cleaning device and a lift cylinder for raising and lowering the lift arm, and when the cleaning device is near the ground, the cleaning device is in a moderately forward tilted state. A tilt link is provided to hold the cleaning device in a horizontal state when the cleaning device is at a position separated from the ground , and one of the fulcrum of the tilt link allows the cleaning device to tilt forward and backward within a predetermined angle range. cleaning device support Organization of the cleaning vehicle, characterized in that it. Cleaning support mechanism of the cleaning vehicle according to claim 1 Symbol mounting, characterized in that a one-way throttle valve to the return side hydraulic circuit during lowering of the lift cylinder for raising and lowering the lift arm.

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