JP3814238B2 - Snow removal equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a snow removal device having a snow removal plate that can move up and down and that can move up and down.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a snowplow provided on the front surface of a light truck with a snow removal plate supported by the tip of an arm that moves up and down by a hydraulic device so that it can be used for snow removal on a back road or a parking lot (for example, see Patent Document 1) ).
[0003]
[Patent Document 1]
Utility Model Registration No. 3048059 (first page, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the case of such a snowplow, there is no problem when removing snow because the snowplow is below the irradiation range of the headlights. The snow removal board enters the irradiation range of the headlight and blocks the illumination light.
[0005]
In such a case, the headlight may be moved upward, but in that case, vehicle inspection acquisition is required.
[0006]
The present invention has been made in view of these points, and an object of the present invention is to provide a snow removal device that can automatically prevent a snow removal board in an elevated state from entering the irradiation range of a headlight.
[0007]
[Means for Solving the Problems]
The invention described in claim 1 is interlocked with a snow removal plate that is mounted on a vehicle equipped with a headlight so as to move up and down and move up and down, a vertical movement means that moves the snow removal plate up and down, and an operation that raises the snow removal plate. The snow removal device comprises a raising and lowering movement means that moves the snow removal board from the standing posture to the lying posture to move it outside the irradiation range of the headlight, and in conjunction with the operation of raising the snow removal plate by the vertical movement means Since the snow removal plate is tilted out of the headlight irradiation range from the standing posture by the hoisting movement means, it is possible to automatically prevent the snow removal plate in the rising state from entering the headlight irradiation range, and the snow removal plate at night The vehicle can be run in the mounted state.
[0008]
According to a second aspect of the present invention, the vertical movement means in the snow removal device of the first aspect includes a vertical movement cylinder that moves the snow removal board up and down, and the raising and lowering means is configured to move the snow removal board between a standing posture and a lying posture. Common switching valve for controlling the working fluid pressurized and supplied to the vertical movement cylinder and the tilt cylinder, and a snow removal plate led from the switching valve to the snow removal plate ascending side port of the vertical movement cylinder The working fluid rises up to the set pressure, provided in the snow removal plate lodging side passage branched from the ascending side passage, the snow removal plate ascending side passage, and led to the snow removal plate fall side port of the tilt cylinder. It is equipped with a relief valve for snow removal plate lodging that sometimes communicates with the snow removal plate lodging side passage, and switches the common switching valve to pressurize the working fluid to the snow removal plate ascent side port of the vertical movement cylinder Supply Until the working fluid pressure reaches the set pressure of the relief valve for snowboard plate collapse, the working fluid is supplied to the snowboard lift port of the vertical motion cylinder through the snowboard lift passage, When the moving cylinder moves to the snow removal plate ascending side, raises the snow removal plate, and when the snow removal plate reaches the rising limit, the working fluid in the snow removal plate fall side passage reaches the set pressure of the relief valve for snow removal plate depression Since the relief valve is in communication, the tilt cylinder can be moved to the snowboard plate fall side, and the vertical switching cylinder can be operated only by operating the common switching valve to the snowboard lift side. The tilt cylinder can be easily sequenced with the snow-climbing board lying down.
[0009]
According to a third aspect of the present invention, there is provided the snow removal device according to the second aspect, wherein the snow removal plate standing side passage led from the switching valve to the snow removal plate standing side port of the tilt cylinder is branched from the snow removal plate standing side passage. A snow removal plate descending passage guided to the snow removal plate descending side port of the vertical movement cylinder and a snow removal plate descending which is provided in the snow removal plate descending passage and communicates with the snow removal plate descending passage when the working fluid rises to the set pressure. If the common switching valve is switched to operate the vertical movement cylinder to the snow removal plate lowering side, the working fluid pressure output from the switching valve is reduced to the snow removal plate. Until the set pressure of the descent relief valve is reached, the working fluid is pressurized and supplied to the snow removal plate standing side port of the tilt cylinder through the snow removal plate standing side passage, so the tilt cylinder first moves to the snow removal plate standing side. And When the snow plate rises and the snow removal plate reaches the limit of the standing posture, the working fluid in the snow removal plate lowering passage reaches the set pressure of the relief valve for lowering the snow removal plate, and this relief valve communicates Because it operates, the vertical cylinder can be moved to the lower side of the snow removal plate, and only by operating the common switching valve to the lower side of the snow removal plate, the tilting movement of the tilt cylinder and the lowering plate of the vertical movement cylinder are lowered. The operation can be easily sequenced.
[0010]
According to a fourth aspect of the present invention, in the snow removal device of the third aspect, a buffer relief valve is provided in a passage for discharging the working fluid to the low pressure side from the snow removal plate standing side passage to the tilt cylinder. When an obstacle on the road surface collides with the lower edge of the snow removal plate and a forced force acts in the direction of snow removal plate fall from the snow removal plate to the tilt cylinder, the tilt cylinder moves from the tilt cylinder to the snow removal plate standing side passage. The working fluid forcedly pushed out is discharged to the low pressure side through the relief valve for buffering, so that the impact when the obstacle collides can be absorbed by this relief operation.
[0011]
According to a fifth aspect of the present invention, the switching valve in the snow removal device according to any of the second to fourth aspects is an electromagnetic switching valve that can be controlled by a control signal from a driver's seat in the vehicle. By controlling the electromagnetic switching valve while observing the movement of the snow removal plate from the driver's seat, the snow removal plate can be operated from the standing posture to the lying posture as much as necessary.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.
[0013]
As shown in FIG. 1, a snow removal device 12 is detachably attached to a front end portion of a vehicle 11 such as a truck. This snow removal device 12 is provided with a vertical movement means 16 for moving a snow removal plate (snow plow) 15 up and down at the front end of a body frame 14 protruding forward from a front wheel 13. In the meantime, the raising and lowering means 17 for raising and lowering the snow removal plate 15 between the standing posture and the lying posture is provided.
[0014]
In the vehicle 11, a bumper 18 is attached to the front end portion of the body frame 14, and a headlight 19 is disposed above the bumper 18.
[0015]
The vertical movement means 16 is configured such that a base end portion of a pair of arms 22 arranged as shown in FIG. On the other hand, a base end portion of a vertically moving cylinder 26 that moves up and down the snow removing plate 15 by a shaft member 25 is pivotally pivoted to a distal end portion of a cylinder mounting member 24 that protrudes obliquely upward from the body frame 14. The tip end portion of the piston rod of the vertically moving cylinder 26 is supported by a shaft member 27 so as to be rotatable to an intermediate member 28 that connects the pair of arms 22.
[0016]
The distal ends of these arms 22 are connected to a central member 31, and an angular bracket 33 is pivotally supported on the central member 31 via an angle shaft 32 so as to be horizontally rotatable. As shown in FIG. An angle cylinder 34 is provided between one side of the eleven and one side of the angle bracket 33. Then, by extending and contracting the angle cylinder 34, the snow removal plate 15 is inclined in the left-right direction with respect to the traveling direction in plan view.
[0017]
The hoisting and moving means 17 moves the snow removing plate 15 from the standing posture to the lying posture in conjunction with the operation of raising the snow removing plate 15, so that the snow removing plate 15 during traveling is below the irradiation range 35 of the headlight 19, that is, As shown in FIG. 1, the bracket 37 provided on the back surface of the snow removing plate 15 is moved up and down via a tilt shaft 38. The bracket 37 is integrated with the angle bracket 33 as shown in FIG. The bracket 41 provided on the angle bracket 33 can be freely mounted, and the shaft member 42 enables the intermediate portion of the tilt cylinder 43 that moves the snow removal plate 15 between the standing posture and the lying posture to freely rotate. The tip end of the piston rod of the tilt cylinder 43 is pivotally connected to the upper end bracket 44 of the snow removal plate 15 by a shaft member 45 so as to be rotatable.
[0018]
FIG. 4 shows a hydraulic circuit as a fluid pressure circuit for operating the up and down cylinder 26, the tilt cylinder 43 and the angle cylinder 34. As a working fluid discharged from a pump 52 driven by a prime mover 51 such as an engine, the hydraulic fluid returns to the tank 53. The hydraulic oil is pressurized and supplied to the vertical movement cylinder 26, the tilt cylinder 43 and the angle cylinder 34 through the filter 54 and the valve device 55.
[0019]
The valve device 55 includes an electromagnetic switching valve 56 as a common switching valve that controls hydraulic oil supplied to the vertical movement cylinder 26 and the tilt cylinder 43, and the snow removal plate of the vertical movement cylinder 26 is raised from the electromagnetic switching valve 56. The snow removal plate ascending side passage 58 led to the side port 57, the snow removal plate lodging side passage 62 branched from the snow removal plate ascent side passage 58 and led to the snow removal plate lodging side port 61 of the tilt cylinder 43, and this snow removal And a relief valve 63 for snow-removing plate inversion which is provided in the plate-falling-side passage 62 and communicates with the snow-removing plate lodging-side passage 62 when the hydraulic oil rises to a set pressure.
[0020]
A check valve 64 for returning fluid when the snow removal plate stands is connected in parallel to the relief valve 63 for falling the snow removal plate. The snow removal plate ascending side passage 58 is provided with a speed controller 65 that regulates the flow rate of the return fluid from the vertical movement cylinder 26 when the snow removal plate descends. Further, a make-up check valve 67 is provided that allows the hydraulic oil to be replenished from the tank passage 66 when the snow removal board lodging side passage 62 becomes lower in pressure than the tank passage 66 connected to the tank 53.
[0021]
Further, the valve device 55 includes a snow removing plate standing side passage 72 led from the electromagnetic switching valve 56 to the snow removing plate standing side port 71 of the tilt cylinder 43, and the vertically moving cylinder 26 branched from the snow removing plate standing side passage 72. The snow removal plate descending side passage 74 led to the snow removal plate descending side port 73 and the snow removal which is provided in the snow removal plate descending side passage 74 and communicates with the snow removal plate descending side passage 74 when the hydraulic oil rises to the set pressure. And a relief valve 75 for lowering the plate.
[0022]
The relief valve 75 for lowering the snow removal plate is connected in parallel with a check valve 76 for returning the fluid when the snow removal plate is raised. In addition, a pilot-operated check valve 77 is provided in the snow removal plate ascending side passage 58 to the vertical movement cylinder 26, and the check is released by the pilot pressure from the snow removal plate lowering passage 74.
[0023]
Similarly, a pilot operated check valve 78 is provided in the snow removing plate standing side passage 72 to the tilt cylinder 43, and the check is released by the pilot pressure from the snow removing plate collapse side passage 62. Further, a relief valve 79 for buffering is provided in the tank passage 66 that discharges hydraulic oil from the pilot-operated check valve 78 to the low pressure side, that is, the tank 53 from the snow removing plate standing side passage 72 on the tilt cylinder 43 side. .
[0024]
Further, the valve device 55 was led to an electromagnetic switching valve 81 as a switching valve for controlling the angle cylinder 34, and to the head side port 82 and the rod side port 83 of the angle cylinder 34 from the electromagnetic switching valve 81, respectively. Snow removal plate left and right tilt passages 84, 85, a relief valve 87 for buffering provided in each of the passages 84, 85 in the tank passage 86 for discharging the hydraulic oil to the low pressure side, that is, the tank 53, and the left and right sides of the snow removal plates A make-up check valve 88 is provided which enables the hydraulic oil to be replenished when the tilting passages 84 and 85 are lower in pressure than the tank passage 86.
[0025]
Each of the electromagnetic switching valves 56 and 81 is an electromagnetic switching valve that can be controlled by a control signal from the driver's seat in the vehicle 11, and in the vicinity of the driver's seat, as shown in FIG. , 81 can be operated with a single electric joystick 91.
[0026]
When the electric joystick 91 is operated in each of the up, down, left, and right directions shown in FIG. 5, a joystick box 92 and a joystick box 92 are arranged so that the corresponding solenoids of the electromagnetic switching valves 56 and 81 shown in FIG. The solenoids of the electromagnetic switching valves 56 and 81 are connected.
[0027]
In short, it is a hydraulic system and control device in which the snow removal plate 15 automatically tilts horizontally in conjunction with the maximum lifting operation of the snow removal plate 15 during traveling. The hydraulic circuit interlocks with the cylinder 43, and the control device is an electric circuit that connects the electric joystick 91 and the electromagnetic switching valves 56 and 81 shown in FIG.
[0028]
Next, the function and effect of this embodiment will be described.
[0029]
In conjunction with the operation of raising the snow removal board 15 by the vertical movement means 16, the snow removal board 15 is lowered from the standing position outside the irradiation range 35 of the headlight 19 by the raising and lowering movement means 17, so that the snow removal board 15 in the raised state is Entering within the irradiation range 35 of the headlight 19 can be automatically prevented, and the vehicle can be run with the snow removal board attached at night. In addition, it is not necessary to move the headlight 19 above the vehicle 11 and there is no need for vehicle inspection acquisition.
[0030]
At this time, by operating the electric joystick 91 in the upward direction, the common electromagnetic switching valve 56 is switched to the up side, and hydraulic oil is pressurized and supplied to the snow removal plate ascending side port 57 of the vertical movement cylinder 26. Until the working hydraulic pressure as the working fluid pressure reaches the set pressure of the relief valve 63 for snowboard plate depression, the working oil passes through the snowboard ascent side passage 58 to the snowboard ascending side port 57 of the vertical motion cylinder 26. Since it is supplied, the vertical movement cylinder 26 first moves to the snow removal plate ascending side, and raises the snow removal plate 15.
[0031]
When the snow removal plate 15 reaches the ascent limit, the hydraulic pressure in the snow removal plate ascending side passage 58 rises, reaches the set pressure of the relief valve 63 for snowboard plate depression, and the relief valve 63 communicates. Therefore, the tilt cylinder 43 can be operated to the side of the snow removal plate lying down, and the snow removal plate raising operation of the vertical movement cylinder 26 and the snow removal of the tilt cylinder 43 can be performed only by operating the common solenoid switching valve 56 to the snow removal plate raising side. Sequence control can be easily performed with plate overturning.
[0032]
In short, in a state where the electric joystick 91 is operated upward, when the snow removal plate 15 is raised to the uppermost position by the vertical movement cylinder 26, the tilt cylinder 43 is operated so that the snow removal plate 15 is tilted forward.
[0033]
On the other hand, when the electric joystick 91 is operated in the downward direction, the common electromagnetic switching valve 56 is switched to the lower side, and the vertical movement cylinder 26 is operated to move to the lowering side of the snow removal plate. Until the hydraulic pressure output from 56 reaches the set pressure of the relief valve 75 for lowering the snow removing plate, the hydraulic oil is pressurized and supplied to the snow removing plate rising side port 71 of the tilt cylinder 43 through the snow removing plate standing side passage 72. Therefore, first, the tilt cylinder 43 is moved to the snow removal plate standing side, and the snow removal plate 15 is raised.
[0034]
When the snow removal plate 15 reaches the limit of the standing posture, the hydraulic pressure in the snow removal plate standing side passage 72 reaches the set pressure of the relief valve 75 for lowering the snow removal plate, and the relief valve 75 is in communication. The vertical movement cylinder 26 can be moved to the snow removal plate lowering side, and the snow removal plate standing operation of the tilt cylinder 43 and the snow removal of the vertical movement cylinder 26 can be performed only by operating the common electromagnetic switching valve 56 to the snow removal plate lowering side. It is possible to easily control the sequence of the plate lowering operation. If these operations are performed simultaneously or in reverse, there is a possibility that the snow removal plate 15 during the standing operation may come into contact with the road surface, and this risk can be prevented.
[0035]
Further, as shown in FIG. 2, an obstacle 95 such as a guard rail on the road surface collides with one end of the snow removal plate 15, and the forced force in the direction of tilting the snow removal plate to the angle cylinder 34 from the snow removal plate 15. When this occurs, the hydraulic oil forced to be pushed from the angle cylinder 34 into the snow removal plate left / right tilt passage 84 or 85 is discharged to the tank passage 86 through the relief valve 87 for buffering. Can absorb the impact of 95 collisions.
[0036]
Similarly, as shown in FIG. 3, during the snow removal operation of the snow cover 96, a snow obstacle 98 on the road surface 97 collides with the lower end of the snow removal plate 15, and the snow removal plate 15 removes snow from the tilt cylinder 43. When a forced force in the plate collapse direction is applied, the hydraulic oil forcedly pushed from the tilt cylinder 43 to the snow removal plate standing side passage 72 is discharged to the tank passage 66 through the relief valve 79 for buffering, This relief operation can absorb the impact when the obstacle 98 collides. The snow removal board 15 inclined forward by this shock absorption is restored by a restoring operation by the electric joystick 91.
[0037]
Furthermore, by operating the electric joystick 91 while controlling the movement of the snow removal plate 15 from the driver's seat in the vehicle 11 and controlling the electromagnetic switching valves 56 and 81, the snow removal plate 15 is lowered from the standing posture to the lying posture by the necessary amount. Can be operated.
[0038]
【The invention's effect】
According to the first aspect of the invention, in conjunction with the operation of raising the snow removal plate by the vertical movement means, the snow removal plate is caused to fall from the standing posture out of the headlight irradiation range by the raising and lowering movement means. The snow removal board can be automatically prevented from entering the irradiation range of the headlight, and the vehicle can be driven with the snow removal board attached at night.
[0039]
According to the second aspect of the present invention, when the common switching valve is switched and the working fluid is pressurized and supplied to the snow removal plate ascending side port of the vertical movement cylinder, the working fluid pressure is reduced to the relief valve for falling the snow removal plate. Until the set pressure is reached, the working fluid is supplied to the snow removal plate ascending side port of the vertical movement cylinder through the snow removal plate ascent side passage. When the snow removal plate reaches the rising limit, the working fluid in the snow removal plate fall side passage reaches the set pressure of the relief valve for snow removal plate depression, and this relief valve communicates. Can be operated to the side of the snow removal plate, and by simply operating the common switching valve to the side of the snow removal plate, the sequence of the snow removal plate raising operation of the vertical cylinder and the snow removal plate fall of the tilt cylinder can be easily controlled. .
[0040]
According to the third aspect of the present invention, when the common switching valve is switched to operate the vertical movement cylinder to the snow removal plate lowering side, the working fluid pressure output from the switching valve is used to lower the snow removal plate. Until the set pressure of the relief valve is reached, the working fluid is pressurized and supplied to the snow removal plate standing side port of the tilt cylinder through the snow removal plate standing side passage, so the tilt cylinder first operates to the snow removal plate standing side, When the snow removal plate is raised, and when the snow removal plate reaches the limit of the standing posture, the working fluid in the snow removal plate lowering passage reaches the set pressure of the relief valve for lowering the snow removal plate, and this relief valve communicates Because it operates, the vertical cylinder can be moved to the lower side of the snow removal plate, and only by operating the common switching valve to the lower side of the snow removal plate, the tilting movement of the tilt cylinder and the lowering plate of the vertical movement cylinder are lowered. Operation and Can simply sequence control.
[0041]
According to the fourth aspect of the present invention, when an obstacle on the road surface collides with the lower end of the snow removal plate and a forcible force in the snow removal plate fall direction acts on the tilt cylinder from the snow removal plate, the snow removal from the tilt cylinder. Since the working fluid forcedly pushed into the plate standing side passage is discharged to the low pressure side through the relief valve for buffering, the relief operation can absorb the impact at the time of the collision of the obstacle.
[0042]
According to the invention described in claim 5, by operating the electromagnetic switching valve while observing the movement of the snow removing plate from the driver seat in the vehicle, the snow removing plate is operated from the standing posture to the lying posture by the necessary amount. Can do.
[Brief description of the drawings]
FIG. 1 is a sectional side view showing an embodiment of a snow removal device according to the present invention.
FIG. 2 is a plan view showing an impact absorbing action by an angle cylinder of the snow removal device same as above.
FIG. 3 is a side view showing the impact absorbing action of the tilt cylinder of the snow removal device same as above.
FIG. 4 is a circuit diagram showing a hydraulic circuit of the snow removal device.
FIG. 5 is a plan view showing an electric joystick for operating the snow removal device.
[Explanation of symbols]
11 Vehicle
15 Snow removal board
16 Vertical movement means
17 Undulating means
19 Headlight
26 Vertical cylinder
35 Irradiation range
43 Tilt cylinder
56 Solenoid switching valve as switching valve
57 Snow removal board ascending side port
58 Snow removal board ascending side passage
61 Snow removal board lodging side port
62 Snowboard boarding side passage
63 Relief valve for falling snowboard
71 Snow removal board upright side port
72 Snowboard standing side passage
73 Snow removal board lower side port
74 Snow removal board lower passage
75 Relief valve for lowering snow removal plate
79 Relief valve for buffer

Claims (5)

A snow removal board that can be mounted on a vehicle equipped with a headlight to move up and down and move up and down;
A vertical movement means for moving the snow removal board up and down;
A snow removal device comprising a raising / lowering means for moving the snow removal plate from the standing posture to the lying posture in conjunction with the raising operation of the snow removal plate to position the snow removal plate outside the irradiation range of the headlight. The vertical movement means includes a vertical movement cylinder that moves the snow removal board up and down.
The hoisting movement means includes a tilt cylinder that moves the snow removal plate between the standing posture and the lying posture,
A common switching valve for controlling the working fluid pressurized and supplied to the vertical movement cylinder and the tilt cylinder;
A snow removal plate ascending side passage led from the switching valve to the snow removal plate ascending side port of the vertical movement cylinder;
A snow removal board lodging side passage branched from the snow removal board ascending side passage and led to the snow removal board lodging side port of the tilt cylinder;
2. A snow removal device according to claim 1, further comprising a relief valve for snow removal plate inversion which is provided in the snow removal plate lodging side passage and communicates with the snow removal plate lodging side passage when the working fluid rises to a set pressure. . A snow removing plate standing side passage led from the switching valve to the snow removing plate standing side port of the tilt cylinder;
A snow removal plate lowering passage branched from the snow removal plate standing side passage and led to the snow removal plate lowering port of the vertical motion cylinder;
3. A snow removal device according to claim 2, further comprising a relief valve for lowering the snow removal plate provided in the snow removal plate lowering passage and communicating with the snow removal plate lowering passage when the working fluid rises to a set pressure. . 4. A snow removal device according to claim 3, further comprising a relief valve for buffer provided in a passage for discharging the working fluid from the snow removal plate standing side passage to the tilt cylinder to the low pressure side. 5. The snow removal device according to claim 2, wherein the switching valve is an electromagnetic switching valve that can be controlled by a control signal from a driver seat in the vehicle.

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