JP3589942B2 - Remote control method of caster wheel adjustment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a caster wheel mounted on the back of a snow plow, in order to improve snow removal accuracy by adjusting the ground contact with a cutting edge, which is a ground portion of the snow plow, and to minimize wear of the cutting edge. The present invention relates to a remote control method for performing adjustment.
[0002]
[Prior art]
Conventionally, this type is as follows.
The lifting mechanism of the caster wheel mounted on the back of the snow plow is a manual adjustment type using a screw or the like, and the method of aligning the cutting edge with the ground surface is to contact the ground surface of the cutting edge with the road surface and use the tire of the caster wheel. And the non-ground interval is increased in advance.
In order to reduce the frequency of troublesome manual adjustment of the caster wheel, a large amount of wear of the cutting edge is anticipated in advance. Does not touch the ground and the entire weight of the snow plow hangs on the cutting edge.
For this reason, the contact force of the cutting edge increases, and as the snow removal operation continues, wear of the cutting edge is promoted more than necessary.
Furthermore, when the tires of the caster wheels are not in contact with the ground during the snow removal work, there is a concern about running stability of the snow removal vehicle.
In addition, as disclosed in Japanese Patent Application No. 10-358478, there is an automatic control device for improving the accuracy in adjusting the cutting force of the cutting edge and the caster wheel.
[0003]
[Problems to be solved by the invention]
The technology described in the prior art has the following problems.
The conventional caster wheel elevating operation is mainly performed by manual adjustment using a screw or the like.
For this reason, in snow removal work, when the wear of the cutting edge and the caster wheel tires is adjusted, the operator manually descends on the road from the driver's cab and performs manual adjustment with screws every time wear progresses. Considering the climatic conditions and other passing vehicles, contact accidents and the like are of great concern.
Therefore, in order to reduce the frequency of manual adjustment of the caster wheel elevation on the road, the non-contact interval of the caster wheel tire is increased, and it is necessary to set the lift amount of the caster wheel tire more than necessary. Become.
Therefore, when the tire of the caster wheel does not touch the ground, all the weight of the snow plow is applied to the cutting edge, so that the contact force of the cutting edge increases, and the cutting edge wears more than necessary by continuous snow removal work. become.
Furthermore, when the tires of the caster wheels are not in contact with the ground during the snow removal work, there is a concern about running stability of the snow removal vehicle.
In addition, as disclosed in Japanese Patent Application No. 10-358478, the precision of adjusting the contact force of the cutting edge and caster wheel tires is improved by an automatic control device, but due to recent economic circumstances, it cannot be adopted due to cost problems. Often becomes.
[0004]
[Means for Solving the Problems]
To achieve the above object, the present invention is as follows.
According to a first aspect of the present invention, there is provided a remote control method for adjusting a contact force between a cutting edge, which is a contact portion of the snow plow, and a tire of a caster wheel when a snow plow mounted on a snow removal vehicle is operated. By switching the solenoid valve for snow plow lifting and lowering by the switching operation of the plow lifting mono lever switch, the snow plow is lowered by the shortening operation of the snow plow lifting fluid pressure cylinder.
As a result, the caster wheel descends at the same time, but the shut-off valve provided in the circuit between the piston and the head cover of the hydraulic cylinder for elevating and lowering the caster wheel switches at the same time as the snow plow descends. Since the free circuit for releasing the pressure inside the lifting hydraulic cylinder is released, the caster wheel lifting hydraulic cylinder has good followability of the snow plow with the ground.
Therefore, the tire of the caster wheel follows the cutting edge of the snow plow, and the grounding state is the same.
[0005]
The second aspect of the invention improves snow removal accuracy by optimally adjusting the contact force between the cutting edge and the tire of the caster wheel.
Furthermore, in order to minimize the wear of the cutting edge, a timer is provided in the electric circuit of the caster wheel lifting / lowering switching solenoid valve 18 for adjusting the contact force between the cutting edge and the tire of the caster wheel. After the cutting edge and the caster wheel tires have the same ground contact state, the engine of the snow-removing vehicle is set to low-speed constant rotation.
Therefore, the discharge amount of the hydraulic pump that is transmitted from the flywheel PTO of the engine is set to a small amount, but since the oil amount is set to a small amount by adjusting the flow control valve, the operation of the push button switch is performed. , The caster wheel lifting / lowering switching solenoid valve is operated at the same time as the operation of the timer for a very short time to slightly lower the tire of the caster wheel to adjust the grounding state between the cutting edge and the tire of the caster wheel.
This is an operation of pressing the tire of the caster wheel against the road surface. The repulsive force of the air inside the tire acts on the road surface to slightly lift the snow plow, thereby reducing the contact force of the cutting edge.
Therefore, the grounding force between the cutting edge and the tire of the caster wheel is in an optimum state, so that the snow removal accuracy is good, and further, the wear of the cutting edge can be minimized.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings based on examples.
With reference to FIGS. 1 and 2, a swing arm 4 is rotatably fitted to a support boss 3 fixed to a back portion of a snow plow 1 by bolts. An end of the upper link 5 is rotatably connected by a pin 9, and the other end of the upper link 5 is rotatably connected to an upper portion of the link bracket 8 by a pin 12.
Further, a tire 11 and a lower link 6 are rotatably and coaxially connected to a lower portion of the link bracket 8 by a shaft 10. The other end of the lower link 6 is connected to a lower portion of the swing arm 4 by a pin 9. I have.
A trunnion 14 of the caster wheel lifting / lowering hydraulic cylinder 7 is rotatably connected to the upper end of the swing arm 4.
The rod at the lower end of the caster wheel lifting / lowering hydraulic cylinder 7 is rotatably connected to the center of the link bracket 8 by a pin 13.
With the above-described configuration, the upper link 5 and the lower link 6 swing up and down as the caster wheel D moves up and down with the upper and lower pins 9 as pivots by the expansion and contraction operation of the caster wheel lifting hydraulic cylinder 7.
In the snow removal operation, when changing the course of the snow plow 1 in accordance with the traveling of the snow removing vehicle, the caster wheel D changes the course of the snow plow 1 with the right and left swing of the swing arm 4 rotatably fitted on the support boss 3. Is to follow.
[0007]
With reference to FIGS. 3 and 4, in the initial operation of the snow plow operation start, the snow plow 1 is raised (forwarded posture), and the snow plow raising / lowering monolever switch 22 installed in the driver's cab is switched. By switching the snow plow up / down switching solenoid valve 19 in the direction in which the snow plow 1 descends, the snow plow 1 descends due to the shortening operation of the snow plow elevation hydraulic cylinder 15.
As a result, the caster wheel D is lowered at the same time, but the shut-off valve 16 arranged in the circuit between the piston of the hydraulic cylinder 7 for raising and lowering the caster wheel and the head cover is switched at the same time when the snow plow 1 is lowered, so that the caster wheel D Since the free circuit for releasing the internal pressure of the wheel lifting hydraulic cylinder 7 is released, the followability of the caster wheel lifting hydraulic cylinder 7 is improved.
Therefore, the tire 11 of the caster wheel D follows the cutting edge 2 so that the ground contact state is the same.
When the caster wheel D comes into contact with the ground when the snow plow is lowered, the weight of the snow plow 1 acts on the caster wheel lifting / lowering cylinder 7, and an internal pressure is generated between the piston and the head cover of the caster wheel lifting / lowering hydraulic cylinder 7 by an external force. Therefore, this is prevented and the following on the road surface is facilitated.
[0008]
Also, in consideration of improving snow removal accuracy and minimizing wear of the cutting edge 2, remote control of adjustment of a ground contact state between the cutting edge 2 and the tire 11 of the caster wheel D performed after the snow plow 1 is descended and grounded. Regarding the method, the timer B is disposed in the electric circuit of the solenoid valve 18 for switching the caster wheel up and down, and the engine B of the snow removing vehicle A is set to low speed constant rotation in order to slightly lower the fluid pressure cylinder 7 for caster wheel up and down. .
Accordingly, the discharge amount of the fluid pressure pump C, which is transmitted from the flywheel PTO of the engine B, is set to a small amount, but is further set to a small oil amount by adjusting the flow control valve 17, and the push button switch 20 At the same time as the operation of the timer for a very short time by the operation, the solenoid valve 18 for switching up and down the caster wheel is simultaneously operated to slightly lower the caster wheel D, so that the cutting edge 2 and the grounding state of the caster wheel D are adjusted to be the same. .
This is an operation of pressing the tire 11 of the caster wheel D against the road surface. However, since a force is applied to the pneumatic tire from the outside, the repulsive force of the air acts on the road surface, and the snow plow 1 is slightly lifted. The contact force of the edge 2 will be reduced.
Therefore, the adjustment of the contact force between the cutting edge 2 and the caster wheel D is in an optimal state, so that the snow removal accuracy is improved, and further, the wear of the cutting edge can be minimized.
[0009]
In the snow removal operation, the snow plow 1 is lifted and lowered by switching the snow plow raising / lowering monolever switch 22 installed in the driver's cab. The free operation by lowering the snow plow 1 and switching the shutoff valve 16 is not performed. It is operating simultaneously.
The operation of raising and lowering the snow plow by operating the mono lever switch 22 for raising and lowering the snow plow and the operation of raising and lowering the caster wheel by operating the selector switch 21 for raising and lowering the caster wheel can be performed independently.
In this case, for the caster wheel lifting / lowering selector switch 21, different shapes and operating forms are respectively selected in order to prevent erroneous operation with the snow plow lifting / lowering mono lever switch 22 and the push button switch 20. The operation of the mono lever switch 22 is for tilting the lever back and forth, and the operation of the push button switch 20 is for the operation of pushing the button downward, while the caster wheel elevating selector switch 21 is for the operation of turning the knob left and right. Has become.
[0010]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
1. In snow removal work, since the ground force adjustment of the caster wheel due to wear of the cutting edge is remotely controlled, the operator does not need to descend from the driver's cab of the snow removal vehicle to the road, and the operator is injured by another passing vehicle, or It is very effective in preventing accidents such as contact with snow removal vehicles.
2. There is an effect of improving snow removal accuracy by adjusting a ground contact force of a slight lowering operation of the tire of the caster wheel with respect to the cutting edge, and an effect of minimizing abrasion of the cutting edge.
[Brief description of the drawings]
FIG. 1 is a side view showing the same cutting edge of a snow plow and a ground contact state of a tire of a caster wheel.
FIG. 2 is a plan view in which a caster wheel is mounted on the back of a snow plow.
FIG. 3 is a hydraulic circuit diagram.
FIG. 4 is an electric circuit diagram.
[Explanation of symbols]
Reference Signs List A Snow removing vehicle B Engine C Fluid pressure pump D Caster wheel 1 Snow plow 2 Cutting edge 7 Castor wheel elevating fluid pressure cylinder 11 Tire 15 Snow plow elevating fluid pressure cylinder 16 Shut-off valve 17 Flow control valve 18 Caster wheel elevating switching Solenoid valve 19 Solenoid valve for switching snow plow up and down 20 Push button switch 21 Selector switch for caster wheel up and down 22 Mono lever switch for snow plow up and down 23 Timer

Claims (2)

During the operation of the snow plow (1) mounted on the snow plow (A), the contact force between the cutting edge (2), which is the contact portion of the snow plow (1), and the tire (11) of the caster wheel (D). In the remote control of adjustment,
By switching the snow plow lifting / lowering switching solenoid valve (19) in the direction in which the snow plow (1) is lowered by switching operation of the snow plow lifting / lowering mono lever switch (22) installed in the cab, the snow plow lifting / lowering fluid pressure is changed. When the snow plow (1) is lowered by the shortening operation of the cylinder (15) and the caster wheel (D) is simultaneously lowered, the snow plow (1) is disposed in a circuit between the piston and the head cover of the hydraulic cylinder (7) for raising and lowering the caster wheel. The shut-off valve (16) is switched at the same time when the snow plow (1) is lowered to form a free circuit for releasing the pressure inside the caster wheel lifting / lowering hydraulic cylinder (7). The caster wheel lifting and lowering hydraulic cylinder (7) improves the ability of the snow plow to follow the ground, Guejji (2) to follow the tire (11) of the caster wheel (D), a remote operation method of caster wheel adjustment, characterized in that it is configured such that the ground state are the same. In order to improve snow removal accuracy by optimally adjusting the contact force between the cutting edge (2) and the tire (11) of the caster wheel (D), and to minimize the wear of the cutting edge (2), the cutting edge (2) is used. ) And the tire (11) of the caster wheel (D), a timer (23) is arranged in the electric circuit of the solenoid valve (18) for switching the caster wheel up and down so as to be in contact with the ground during the snow removal work. After the grounding state between the cutting edge (2) and the tire (11) of the caster wheel (D) becomes the same, the engine (B) of the snow removing vehicle (A) is rotated at a low speed and a constant speed so that the engine ( The discharge amount of the fluid pressure pump (C) that is transmitted from the flywheel PTO of B) is set to a small amount. Since the oil amount is set to a very small value by the adjustment of (17), the operation of the push button switch (20) activates the timer (23) for an extremely short time, and at the same time, the simultaneous operation of the caster wheel lifting / lowering switching solenoid valve (18) is performed. The caster wheel (D) is operated by slightly lowering the tire (11) of the caster wheel (D), and adjusting the ground contact between the cutting edge (2) and the tire (11) of the caster wheel (D). By pressing the tire (11) on the road surface, the repulsive force of the air inside the tire acts on the road surface to slightly lift the snow plow (1), thereby reducing the contact force of the cutting edge (2). In addition, the contact force between the cutting edge (2) and the tire (11) of the caster wheel (D) is in an optimum state, so that snow removal accuracy is improved, and furthermore, , Remote control method of the caster wheel adjustment, characterized in that it is configured to be able to minimize the wear of the cutting edge.

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