JPH0516823U - Rotary snowplow snow removal equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In a snowplow equipped with a snowplow at the front of the snowplow so that it can be raised and lowered, even when the snowplow is grounded during snow removal work, the front wheels of the vehicle have an appropriate load required for traction steering. (EN) Provided is a pressurizing / depressurizing device for a snow removing device, which can obtain a ground contact pressure that can remove snow even on hard snow. [Structure] Hydraulic cylinder 10 for raising and lowering snow removing device and hydraulic source 1
1, a hydraulic pressure switching valve 21 for controlling hydraulic cylinder up-and-down control is provided in parallel with a hydraulic pressure switching valve 21 having a pressurizing position and a depressurizing position and a pressurizing / pressurizing adjusting valve 22 connected in series.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow removing device for a rotary snow removing vehicle, and more particularly to a ground pressure pressurizing / depressing device thereof.

[0002]

[Prior Art]

 A snowplow is configured with a snowplow attached to the front part of the vehicle body, and it is sent to the place where the snowplow is performed, and when it arrives at the snowplow, the snowplow is used to remove the snow.

2 and 3 are views showing an example of a rotary snow removal vehicle, in which a snow removal device 2 including an auger 3, a blower 4 and a chute 5 is provided in the front part of a vehicle body 1, and the snow removal device 2 is used during forwarding. As a whole, it is lifted up to a predetermined height and separated from the road surface, the snow removal device 2 is lowered during snow removal work, and the snow accumulated on the road is scraped by the auger 3 and blown by the blower 4 through the chute 5 to the outside of the road. Throw snow at a place.

In a conventional snow removing vehicle, for example, as shown in FIG. 4, a snow removing device 2 includes a front frame 6 of a vehicle body, a mounting frame 7 for mounting a rear end of the snow removing device 2, and a vertical parallel arrangement between them. Are connected to each other by a pair of left and right parallelogram links composed of two links 8 and 9 provided at. The lower link 9 of the parallelogram link has a lower end coupled to the front end of the lower link 9 and an upper end coupled to the upper portion of the front frame 2 of the vehicle body by a hydraulic cylinder 10 attached to the vehicle body front frame 7. It is possible to displace between the descending position shown by the solid line around the center and the ascending position shown by the one-dot chain line that has swung upwards more than that, and as a result, the parallelogram links have opposite sides parallel to each other. It is held and deformed, and is sent to the snow removal device in the raised position, and the snow removal work is performed in the lowered position.

FIG. 5 shows an example of a hydraulic circuit that is generally used in the past for raising and lowering the snow removal device 2. In the figure, a hydraulic switching valve having four positions of an ascending position, a descending position, a float position and a stopping position is provided between a hydraulic cylinder 10 for raising and lowering a snow removing device and a hydraulic pump 11 driven by an engine for running and working a vehicle. Twelve are provided. The lifted and lowered positions of this valve are spring-return type, which holds the position only while the operator holds it by hand, and supplies the hydraulic cylinder 10 with a predetermined hydraulic pressure acting in an ascending or descending direction. When is released, it returns to the stop position and the hydraulic pressure supply to the cylinder is stopped. When the float position is manually put in this position, a detent is applied, and the float position is held in that position, and only the pump port is closed and the hydraulic cylinder 10 is allowed to move freely in this position. Therefore, if it is placed in the float position, it is possible to remove the snow by pressing it against the snow surface only by its own weight. Also, even if there is some unevenness on the road surface, we often follow up.

In addition to the snow removal device lifting cylinder, a switching valve for controlling a hydraulic actuator such as a hydraulic cylinder for performing various operations such as chute expansion / contraction, chute turning, chute raising / lowering, chute cap, blower case, and tilt. It is provided in parallel with the hydraulic switching valve 12 for raising and lowering the snow removal device, and these are integrally connected with the relief valve 13, but they are omitted in the figure except those related to the elevation of the snow removal device.

By the way, the snow removal device 2 itself has a considerable weight, and when the snow removal device is raised, this acts as a load, and appropriately balances the weight of the engine mounted on the rear part of the vehicle body with the front wheels. The rear wheels are moderately loaded to generate traction, which allows the vehicle to run and steer properly, but when the snow removal device is floated, the snow removal device's own weight is completely placed on the ground and the vehicle body is removed snow. The load on the equipment is not applied at all, the balance with the weight of the engine is lost, the load applied to the front wheels is reduced, and as a result, the traction force is reduced.

Further, although hard snow can be removed by pressing as in the past, it cannot cope with unevenness of the road surface.

[0009]

[Problems to be solved by the device]

 In consideration of the above-mentioned problems of the conventional lifting control device of the snow removing device of the snow removing vehicle, the present invention does not significantly disturb the load balance of the front and rear wheels during the snow removing work, and does not float even on hard snow. It is an object to provide a pressurizing / depressurizing device that can apply snow to a snow removing device.

[0010]

[Means for Solving the Problems]

 The snow removing device pressurizing / depressing device of the present invention for solving the above-mentioned problems is provided in parallel with a conventional hydraulic switching valve for controlling a snow removing device lifting cylinder, and between a hydraulic power source and the lifting cylinder. It is characterized in that a hydraulic pressure switching valve having a pressurizing position and a depressurizing position and a pressurizing / depressurizing adjusting valve are connected in series.

[0011]

[Action]

 Since this device is configured as described above, the normal hydraulic switching valve is set to the stop position during snow removal work, and the second hydraulic switching valve additionally installed according to the present invention is held in the pressurizing position or the depressurizing position to apply the pressure. By adjusting the decompression adjusting valve according to the ground pressure to be applied to the snow removal device, a hydraulic pressure force in the pressurizing direction or depressurizing direction is applied to the snow removal device lifting hydraulic cylinder, and this is increased or decreased by the weight of the snow removal device. Therefore, it is possible to obtain an appropriate ground pressure for moving or steering the vehicle during snow removal work, or for removing hard snow.

[0012]

【Example】

 Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a hydraulic circuit in which a snow removal device lifting hydraulic cylinder control circuit previously described with reference to FIG. 5 is provided with a grounding pressure increasing / decreasing device of the snow removal device according to the present invention.

The hydraulic circuit constituting the pressurizing / depressurizing device 20 of the present invention is arranged between the hydraulic cylinder 10 for lifting the snow removing device and the hydraulic pump 11 driven by the engine, in parallel with the hydraulic switching valve 12 for controlling the hydraulic cylinder lifting. In addition, a second hydraulic pressure switching valve 21 configured as a solenoid operated spring center hydraulic pressure switching valve having a pressurizing position, a depressurizing position and a stop position, and a pressure of hydraulic oil flowing from the hydraulic pressure source 11 into the hydraulic pressure switching valve 21 is adjusted. The pressure increasing / decreasing pressure adjusting valve 22 is connected and provided in series. It should be noted that the amount of oil flowing to the second hydraulic pressure switching valve 21 may be extremely small, and in order to eliminate a circuit problem, the hydraulic pressure switching valve 12 and the second hydraulic pressure switching valve 21 of the discharge side pipe of the hydraulic pump 11 may be connected. A flow divider 23 is provided at the branch point of the flow path.

At the start of the snow removal work, the hydraulic switching valve 12 for controlling the lifting and lowering of the snow removal device lifting and lowering cylinder 10 is moved to the lowered position, grounded to the snow removal device, and then returned to the stop position.

During the snow removal operation, the second hydraulic pressure switching valve 21 is set to the pressurizing or depressurizing position, and the pressure of the applied hydraulic pressure is adjusted by the pressurizing / decreasing adjusting valve 22 according to the pressurizing / decreasing amount. If the pressure of the hydraulic pressure applied to the hydraulic cylinder 10 is large, the lifting and lowering by the hydraulic switching valve 12 will be the same, so if the relief set pressure of the hydraulic switching valve 12 is 140 kg / cm ² , it will be applied. The adjusting range of the decompression adjusting valve 22 is set to 10 to 30 kg / cm ² to prevent the snow removing device from separating from the ground when decompressing and conversely preventing the snow removing device from following unevenness of the ground when pressurized.

As described above, by reducing the ground contact pressure, part of the own weight of the snow removing device acts as a load on the vehicle body, the ground contact pressure of the front wheels rises, and the traction force necessary for steering and movement is obtained. On the contrary, by increasing the ground contact pressure, even if the snow on the ground is hard, it can be pressed with the force more than the weight of the snow removal device to remove the snow without leaving any residual snow. Can be made

Although the case where the present invention is applied to a snow removal vehicle equipped with a rotary snow removal device has been described as an example, the present invention can also be applied to snow removal vehicles equipped with other snow removal devices.

[0018]

[Effect of the device]

 As described above, according to the present invention, it is possible to apply a suitable load to the front wheels of the vehicle even when the snow removal device is in contact with the ground during snow removal work, which does not hinder towing and steering, and the snow is hard. In this case, it is possible to remove all the snow, which is effective in improving the snow removal capacity.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a cylinder controller for elevating and lowering a snow removing device including a pressurizing and depressurizing device according to the present invention.

FIG. 2 is a side view of a known rotary snow plow.

FIG. 3 is a front view thereof.

FIG. 4 is a side view showing an example of a lifting mechanism of a known rotary snow removal device.

FIG. 5 is a hydraulic circuit diagram of a conventional controller for a snow removal device lifting cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Snowplow vehicle body 2 Snow removal device 10 Lifting hydraulic cylinder 11 Hydraulic pump 12 Hydraulic pressure switching valve 20 Pressure increasing / decreasing device 21 Second hydraulic pressure changing valve 22 Pressure increasing / decreasing adjustment valve

Claims (1)

[Scope of utility model registration request] 1. A snow removing device provided at a front end portion of a vehicle body of a snow removing vehicle so as to be able to move up and down, between a lifting hydraulic cylinder and a hydraulic source.
What is claimed is: 1. A ground pressure adjusting device for a snow removing device for a rotary snow removal vehicle, comprising: a hydraulic switching valve having three positions: an ascending position, a descending position and a float position, wherein the hydraulic switching valve is provided between the hydraulic source and the hydraulic cylinder. A snow removal device, characterized in that a hydraulic pressure switching valve having a pressurizing position and a depressurizing position and a pressurizing / pressurizing adjusting valve are connected in series in parallel therewith.