JPH0240088Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a snow removal truck, and more particularly to a snow removal truck that can be applied to the maintenance of general roads and airports.

[Conventional technology]

For example, a snow plow truck equipped with a snow plow or snow grader is known as a means for preparing a road surface suitable for airplanes to remove snow from an airfield.

The above-mentioned conventional snow removal truck has a snow plow at the front of the vehicle or a snow grader at the center of the vehicle fixedly arranged so that the traveling angle remains unchanged.

Note that the traveling angle herein refers to the angle that the longitudinal direction of the snow plow or snow grader makes with respect to the traveling direction of the vehicle.

[The problem that the idea aims to solve]

If the advancing angle of the snow plow or snow grader does not change, as in conventional snow removal trucks, when the vehicle turns a curve, the snow removal width is reduced compared to when the vehicle is traveling in a straight line.

That is, if the advancing angle remains unchanged, as shown in FIG. 4, when the vehicle 1 turns to the left around the turning center O, the snow plow 2 also turns around the turning center O together with the vehicle. Therefore, the snow removal width WT at that time is the snow removal width when driving in a straight line.
It becomes smaller than WS, and snow that should be removed is left behind.

This phenomenon is particularly problematic when a part of an airport taxiway is curved and snow is removed from that part. This is because when removing snow along curves, with conventional snow removal trucks, the snow removal width is reduced only at curved sections such as taxiways. Therefore, it is necessary to run the snow removal truck again to repair the remaining parts, which poses a problem in snow removal operations at airports where prompt snow removal operations are required.

[Means to solve the problem]

Therefore, the object of this invention is to provide a snow removal truck that can ensure the same snow removal width even when traveling on a curve as when traveling in a straight line.

In accordance with the above object of this invention, there is provided a snow plow or a snow grader which is pivotally mounted on a vehicle and whose advancing angle is variably set using a hydraulic cylinder, and a snow plow or snow grader which detects the movement of a handle and adjusts the movement of the hydraulic cylinder according to the amount of rotation of the handle. There is provided a snow removal truck characterized in that it has a control means for controlling the snow plow or the snow grader so that the longitudinal direction of the snow plow or snow grader is directed toward the turning center of the vehicle.

[Effect]

In this invention, the longitudinal direction of the snow plow or snow grader is controlled to be directed toward the turning center of the vehicle.

〔Example〕

A snow removal truck according to this invention is shown in Fig. 1.

In the figure, reference numeral 10 denotes a vehicle part of a snow removal truck;
Reference numeral 12 indicates a driver's seat. Two hydraulic cylinders 14 and 16 are pivoted in parallel in front of the driver's seat 12, and these hydraulic cylinders 14,
The other ends of the snow plows 16 are each pivotally connected to a snow plow 18.

Thus, the advancing angle θ of the snow plow 18 can be changed by controlling the expansion and contraction of the hydraulic cylinders 14 and 16 individually.

In this invention, the operating amount of each of the hydraulic cylinders 14 and 16 is adjusted in accordance with the amount of rotation of the handle to automatically control the advancing angle.

The automatic control mechanism described above follows the procedure shown in FIG.

For example, a steering angle measuring device is attached to the handle. This steering angle measuring device has a function of converting the steering angle into voltage, and the steering angle signal converted into voltage is input to a microcomputer serving as a control means.

The microcomputer is previously equipped with an arithmetic program that associates the valve drive signal for hydraulic cylinder control with the above-mentioned steering angle signal.

Therefore, if a steering angle signal is given, the turning center of the vehicle at that time is determined. Then, in accordance with this, it is possible to calculate how much the snow plow should be rotated so that the longitudinal direction of the snow plow is directed toward the turning center of the vehicle. Therefore, calculation of the valve actuation amount for hydraulic cylinder control that can satisfy this condition is executed.

Then, based on the above calculation result, the valve is driven, and the advancing angle of the snow plow is varied by operating the hydraulic cylinder.

As described above, according to this example, the advancing angle changes moment by moment as the steering wheel is operated, and the longitudinal direction of the snow plow always points toward the turning center of the vehicle.

The snow removal truck equipped with a snow grader instead of the snow plow in the above example is also implemented in the same manner as described above.

This invention can also be applied to a snow removal truck constructed as shown in FIG.

In this example, a snow plow 180 is pivotally mounted in front of the driver's seat 120, and both ends of a hydraulic cylinder 140 are pivotally mounted between the vehicle and the snow plow 180. Therefore, by operating only one hydraulic cylinder 140, the snow plow 1
You can change the advancing angle of 80 degrees.

In addition, a snow grader 20 is installed in the middle of the vehicle 100.
0 is pivotally mounted via two hydraulic cylinders 220 and 240. Therefore, the hydraulic cylinder 220,
240 individually, the advancing angle of the snow grader 200 can be changed.

The snow plow 180 and snow grader 200 in this example are also similar to the above embodiment,
Using control means such as a steering angle measuring device, a microcomputer, and a hydraulic piping system, each hydraulic cylinder is operated according to the amount of rotation of the handle to direct the longitudinal direction of the snow plow or snow grader to the turning center of the vehicle. Control as follows.

In the above embodiment, the rotation angle of the steering wheel is measured by the operating angle measuring device, which measures the displacement proportional to the steering wheel angle in the steering device, converts it into voltage, and inputs it to the microcomputer. It is okay to do so.

[Effect of idea]

According to the present invention, even when the vehicle makes a curve, the snow can be removed using the maximum width of the snow plow or snow grader, and no snow is left behind, which is advantageous because the efficiency of snow removal work can be improved.

[Brief explanation of the drawing]

Figures 1 and 3 are plan views of the snow removal truck according to the present invention, Figure 2 is a flowchart showing the procedure for changing the advancing angle of the snow plow according to handle operation, and Figure 4 is a conventional snow removal truck. It is a diagram explaining the snow removal width of the truck. 14,16,140,220,240...Hydraulic cylinder, 18,180...Snow plow, 20
0...Snow grader.

Claims (1)

[Scope of utility model registration request] A snow plow or snow grader is pivotally attached to the vehicle and has a variable travel angle using a hydraulic cylinder, and detects the movement of the handle and operates the hydraulic cylinder according to the amount of rotation of the handle to move the snow plow or snow grader to the center of the vehicle's turn. 1. A snow removal truck comprising a control means for controlling the longitudinal direction of a snow plow or snow grader.