KR101251780B1 - Device and Method for adjusting a grounding pressure of shovel edge of snowplow - Google Patents

Abstract

The present invention relates to an apparatus and a method for adjusting the road grounding pressure of a blade for a snow plow, wherein a supply line and a return line of hydraulic oil are installed between the tank and the lift cylinder, and the lifting and removing of the snow plow with the snow plow blade is attached by the operation of the lift cylinder. In the apparatus for adjusting the down pressure, a supply line is connected to a pressure adjusting return line connected to the tank, and a pressure adjusting means is installed in the pressure adjusting return line to apply a lifting pressure of the snow remover to the lift cylinder to reduce the load of the snow remover. As the ground pressure of the blade and road surface is kept constant during snow removal, the blade is raised and lowered according to the condition of the road surface generated during snow removal, and the ground pressure of the blade is kept constant, improving the snow removal ability and minimizing the wear of the blade. As a result, the operating speed of the snow removal vehicle has been improved to maximize the hourly snow removal capacity. .

Description

Device and method for adjusting a grounding pressure of shovel edge of snowplow}

The present invention relates to a hydraulic apparatus for raising and lowering a snow plow with a blade, and more particularly, to reduce the load of the snow plow and adjust the ground pressure of the road surface and the blade so that the damage caused by the impact of the road surface and the blade is reduced. The present invention relates to a road surface pressure regulating device and method of a snow blade for a snow plow.

In general, when the snow falls in winter, the roads in the downtown area are iced by the crushing of the driving vehicles, and in the suburban areas, that is, the roads with less driving, the snow accumulates and the operation stops when a large amount of snow falls. Happening often happens. Especially in mountainous areas, when a certain amount of snow falls, the roads can not run and the roads are controlled to prevent accidents. In order to solve this problem, snow plows are attached to the vehicle to collect snow accumulated on the road surface in one place.

Such a snow removing machine includes a snow removing plate mounted on the first half of the snow removing vehicle, a blade mounted below the snow removing plate, and a hydraulic device for adjusting the snow removing plate.

Here, the hydraulic device adjusts the lifting and lowering movement of the snow removing machine and the left and right angles of both sides of the snow removing plate, and the snow making machine moves up or down so that the blade selectively contacts the road surface by using the hydraulic device. This means that, for the purpose of snow removal, the snow plow descends and the blade contacts the road surface.

When the snowplow is lowered for snow removal, the operator may operate the hydraulic device using the joystick or the hydraulic device using the weight of the snowplow. At this time, the operator operates the lift cylinder included in the hydraulic device.

However, the operation method of the hydraulic device using the weight of the joystick and the snow removal machine frequently causes overloading while the blade strongly presses the ground when the snowplow descends, and excessive wear of the blade is caused by the road surface during snow removal and the blade is broken or It is broken.

As described in Korean Patent No. 10-0910387 for this problem, a snow blade ground contact overload prevention device related to the raising and lowering of the snow plow among the hydraulic devices for operating the snow plow is disclosed.

Looking at this in detail as shown in Figure 1, the conventional overload protection device 10 and the lift cylinder (11) installed in conjunction with the lifting and lowering the snowplow, and for supplying and discharging the hydraulic fluid to the lift cylinder (11) To the first and second hydraulic lines 12 and 13, the dual check valve 14 and the directional control valve 15 and the first hydraulic line 12 installed on the first and second hydraulic lines 12 and 13, respectively. A pressure sensor 16 installed to detect an overload situation when the blade contacts the road surface, a bypass pipe 17 connected to the second hydraulic line 13 and the first hydraulic line 12, and the bypass The self-loading control valve 18 and the flow regulator 19 installed in the pipe 17 was made.

Therefore, when the operator lowers the snow remover through the joystick, the ground pressure of the blade and the road surface is sensed by the pressure sensor 16, and is automatically recognized by the operator as soon as the pressure sensor 16 reaches the preset pressure. have. At this time, the operator recognized whether the ground pressure was exceeded through the lighting of the warning light by the signal transmitted from the pressure sensor 16.

In addition, the hydraulic fluid discharged from the lift cylinder 11 to the second hydraulic line 13 while the snowplow descends is reduced to the first hydraulic line 12 via the self-lowering control valve 18 and the flow regulator 19 to lift the lift. Flowed back into the cylinder (11).

Therefore, the conventional overload protection device 10 lowers the snow plow by stopping the joystick operation after the operator identifies the signal transmitted through the warning light when the pressure sensor 16 detects the ground pressure of the blade and the road surface, when the pressure is greater than the set pressure. This was done. In addition, when snow is removed in this state, snow removal was made with the ground pressure of the blade and road surface being kept constant.

Here, reference numeral "T" is a tank (Tank), "M" is a motor (Motor), "P" is a pump (Pump), the arrow in the lift cylinder 11 is a lift cylinder 11 when the snow plow descends. Direction of piston movement.

However, the conventional overload protection device 10 is to warn the operator only when the ground pressure of the blade and the road surface is overloaded. That is, if the ground pressure of the blade and the road surface is overloaded when the snowplow descends and snowfall occurs, a warning is issued, and the operator who recognizes this has to be followed by the operation of raising the snowplow and returning the ground pressure of the blade and the road to the set range. . Therefore, when the curvature of the road surface suddenly changes, it cannot be quickly dealt with, and when the operator's operation is made, it is already after excessive wear occurs on the blade.

In addition, in the case of snow removal on the road where the uphill and downhill slopes are repeated, the operator had to repeatedly perform the operation, in which case the proper pressure of the blade and the road surface is frequently released from the set range, and each time it is released The phenomenon of snow removal due to excessive wear of the blade or poor contact between the blade and the road surface occurred.

The present invention devised to solve the above problems, the load of the snow plow is reduced by the pressure adjusting means to be additionally installed, the snow plow, that is, the blade is automatically raised and lowered according to the curvature of the road surface, so that the road surface without any operation It is an object of the present invention to provide an apparatus and a method for adjusting the road grounding pressure of a blade for a snow plow so that the grounding pressure of the blade and the road surface is kept constant at all times regardless of bending.

In addition, as the blade is raised and lowered according to the condition of the road during snow removal, the grounding time of the blade and the road is improved, so that it is possible to perform snow removal with a uniform quality, as well as to reduce the frictional force between the road surface and the steering ability of the driving vehicle. The purpose of the present invention is to provide an apparatus and a method for adjusting the road ground pressure of a blade for a snow plow, in which a driving speed of a snow removal vehicle for snow removing operation is improved and wear of the blade is minimized.

In order to achieve the above object, the road ground pressure adjusting device of the blade for the snow plow according to the preferred embodiment of the present invention is selectively applied in parallel with the lower line of the lift cylinder, that is, the line associated with the lowering of the plow. A hydraulic oil supply line and a return line are installed between the lift cylinder and the lift cylinder, and a device for adjusting the rising and lowering pressure of the snow removing machine with a snow removing blade by the operation of the lift cylinder, the supply line is connected to the pressure adjusting return line. In the pressure adjusting return line, a part of the hydraulic oil discharged from the lift cylinder to the supply line remains in the tank as the descending snowplow descends, thereby restoring a portion of the hydraulic oil, thereby applying a lifting pressure to the shift cylinder to reduce the load of the snowplow. This is installed.

The supply line and the return line, the control unit having a direction control valve mounted to change the flow direction of the hydraulic oil supplied by the motor from the tank; And a dual check valve mounted to control the flow paths of the supply line and the return line to control the flow of the working oil passing through the control unit.

The return line for pressure adjustment extends from the return line between the direction control valve and the tank and is connected to the supply line.

The pressure adjusting means includes a pressure adjusting direction control valve and a pressure control valve.

The pressure control valve adjusts the hydraulic pressure of the hydraulic oil by returning the hydraulic oil for the hydraulic pressure exceeding the set pressure to the tank when the hydraulic pressure of the pressure adjusting return line reaches the preset input pressure.

When the pressure control direction control valve descends, the pressure control device switches to a forced pressure-free state by a pressureless device, and guides the hydraulic oil of the pressure control return line to the pressure control valve.

The pressure adjusting means further includes a second throttle valve, and the second throttle valve is installed between the pressure control directional control valve and the pressure control valve to adjust the flow of the working oil.

The pressure adjusting means further includes a controller, and the controller is installed to control at least one of the pressure adjusting direction control valve, the second throttle valve, the pressure control valve, and the pressureless device.

In the supply line, a check valve is installed between the lift cylinder and the dual check valve to direct the flow of hydraulic oil discharged from the lift cylinder to the pressure regulating return line as the snow blower descends.

The check valve is interlocked with a first throttle valve that regulates the flow of hydraulic oil flowing through the supply line.

On the other hand, the road surface pressure adjustment method of the blade for the snow plow according to the preferred embodiment of the present invention, the operation of the lift cylinder through the operation of the lift cylinder through the supply line and the return line of the hydraulic oil installed between the tank and the lift cylinder is attached to the snow plow. A method of adjusting the raising and lowering, the snow removing machine of the raised position is lowered (S100); Operating oil discharged from the lift cylinder to the supply line flows into the pressure adjusting return line (S200); Adjusting the hydraulic pressure of the hydraulic oil by a preset pressure by a pressure control valve installed at the pressure adjusting return line (S300); The hydraulic pressure of the hydraulic oil adjusted in the pressure adjusting return line is acted on the lifting pressure of the lift cylinder (S400); is made.

Here, the step of introducing the operating oil into the pressure adjusting return line (S200) includes the step of switching the pressure control direction control valve installed in the pressure adjusting return line when the snowplow descends (S210); Operating oil discharged to the supply line is flowed to the pressure control direction control valve installed in the pressure adjustment return line by the check valve installed in the supply line (S220); The flow of the hydraulic oil passing through the pressure control direction control valve is adjusted by the second throttle valve and flows into the pressure control valve (S230);

In addition, the step of adjusting the hydraulic pressure of the hydraulic oil by the pressure control valve (S300) is a step of maintaining the hydraulic oil in the pressure adjusting return line through the pressure control valve so that the hydraulic pressure of the hydraulic oil reaches a set pressure (S310); And a step (S320) of returning a part of the working oil to the tank through the pressure control valve for the hydraulic pressure of the working oil exceeding the set pressure.

As described above, according to the present invention, there is an effect in which the blade decompresses the road surface by the load of the snow removing machine reduced by the pressure adjusting means to generate a ground pressure, and the blade moves up and down as the road surface is bent.

In addition, since the blade is raised and lowered according to the curvature of the road surface, the ground pressure of the blade and the road surface at the time of snow removal is always kept constant regardless of the curvature of the road without a separate operation has the effect of improving the snow removal ability.

In addition, even when the blade is worn during snow removal, the blade is continuously lowered as much as it is worn, so that the ground pressure with the road surface is always maintained, so the snow removal ability is also kept constant.

In addition, snow removal vehicles can be operated while driving at high speeds by improving the steering ability, and snow removal can be achieved by maximizing the snow removal capacity per hour, minimizing the wear of the blades, thereby prolonging the life of the blades and lengthening the blade replacement intervals. Therefore, the replacement cost of the blade is reduced.

In addition, it is possible to reduce the impact load during the impact of the blade and the road protrusion during the operation using the snow removal vehicle, thereby preventing the damage of the snow plow and increase the safety of the vehicle.

In addition, the wear and replacement time interval of the blade is extended to increase the amount of snow that can be removed with a single blade, the high-speed driving of the snow removal vehicle can be improved per hour snow removal ability of one snow removal vehicle, as well as the snow removal time It has a prolonged effect.

1 is a hydraulic circuit diagram schematically showing a conventional hydraulic device for a snow plow,
2 is a hydraulic circuit diagram of the road grounding pressure adjusting device of the blade for a snow plow according to the preferred embodiment of the present invention.
3 is a block diagram schematically showing a control state of the ground pressure adjusting device of FIG.
4 is a hydraulic circuit diagram of a snow remover to which the ground pressure adjusting device of FIG. 2 is applied to a snow remover,
FIG. 5 is a side view illustrating a state in which the snow removing device to which the ground pressure adjusting device of FIG. 2 is applied is moved up and down,
6 is a block diagram showing a method for adjusting the road ground pressure of the blade for the snow plow according to the preferred embodiment of the present invention.
FIG. 7 is a block diagram showing a preferred embodiment of step S200 of FIG.
FIG. 8 is a block diagram illustrating a preferred embodiment of step S300 of FIG. 7.

Hereinafter will be described in detail with reference to the accompanying drawings for the road surface pressure adjusting device of the blade for a snow plow according to a preferred embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a road grounding pressure adjusting device for a snow blade according to a preferred embodiment of the present invention. FIG. 3 is a block diagram schematically showing a control state of the grounding pressure adjusting device of FIG. 2 is a hydraulic circuit diagram of a snow remover applied to the snow removing machine, and FIG. 5 is a side view illustrating a state in which the snow removing device to which the ground pressure adjusting device of FIG. 2 is applied is moved up and down.

First, the snow removing machine (1 in Fig. 4) is composed of a snow removing plate (2 in Fig. 4) and a blade (3 in Fig. 4), this snow removing machine (1) is a snow removal area, snow removal capacity, size of the snow removal vehicle, snow removal There are various sizes and types according to the snow removal capacity of the vehicle, and thus the weight thereof may range from several hundred kilograms to thousands of kilograms.

In addition, the snowplow 1 is lowered during snow removal so that the blade 3 is in contact with the road surface 4 so that both sides of the width are inclined on the plane, so that the snow removing device snowfalls outward from the road surface 4. The snowplow 1 is fixed up and down except snow removal.

At this time, raising and lowering of the snow removing machine 1, angle adjustment of both sides, etc. are performed by the lift cylinder 101 and a pair of steering cylinders (201 of FIG. 3).

Here, the present invention relates to the raising and lowering of the snow plow 1 by the lift cylinder 101. More specifically, the load of the snowplow 1 is adjusted by the pressure adjusting means, and the blade 3 presses the road surface 4 while the blade 3 presses the road surface 4 by the load of the plowed snow 1 reduced through this. The road surface ground pressure adjusting device 100 of the blade (3) configured to be raised and lowered.

As shown in FIG. 2, the road ground pressure adjusting device 100 of the blade for a snow plow according to the preferred embodiment of the present invention includes a lift cylinder 101 installed to raise and lower the snow plow 1 mounted on a vehicle. And a supply line 104 and a return line 105 connected between the lift cylinder 101 and the tank 102 to provide a hydraulic oil flow path, and installed in the supply line 104 and the return line 105. Directional control valve 106 for switching the flow direction of the hydraulic oil supplied by the motor 103 from the 102, and the flow path of the supply line 104 and the return line 105 is intermittently installed to interrupt the flow of the hydraulic oil The pressure check return line 110 extending from the dual check valve 107 and the return line 105 and connected to the supply line 104, and the snow removing machine 1 in the shift cylinder 101 in the pressure adjustment return line 110. Installed to reduce the load on the snowplow 1 by applying a lifting pressure of Pressure adjusting means, a controller 114 for controlling the pressure adjusting means is included.

Here, the supply line 104 is lifted to guide the flow of the working oil to the pressure control return line 110 while preventing the back flow of the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 when the snowplow 1 descends. A check valve 108 is installed between the cylinder 101 and the dual check valve 107.

At this time, the check valve 108 is installed in conjunction with the first throttle valve 109 for adjusting the flow of the working oil flowing through the supply line 104, these check valve 108 and the first throttle valve 109 is linked The valve in the installed state is also called a speed control valve. Therefore, only the check valve 108 may be installed in the supply line 104 or a speed control valve may be installed.

The pressure adjusting return line 110 extends from the return line 105 between the direction control valve 106 and the tank 102 and is connected to the supply line 104 between the check valve 108 and the lift cylinder 101. do.

The pressure adjusting means maintains a part of the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 by the lowering of the snow remover 1 to the tank 102, thereby remaining a part of the hydraulic fluid in the lift cylinder 101. Is applied to reduce the load on the snow plow 1.

Here, the pressure adjusting means is a pressure control direction control valve 111, the second throttle valve 112 and the pressure control valve 113 in sequence from the point connected with the supply line 104 on the pressure adjusting return line 110 It is made by mounting.

Pressure control directional control valve 111 is installed in conjunction with a pressureless device (not shown) separately installed so that the snowplow 1 is lowered by its own weight or lift cylinder 101 to achieve a forced pressureless state. do. Here, the pressureless device is already used in the hydraulic device of the snow removing machine, and is borrowed and installed in the pressure control direction control valve 111. In addition, the pressure-free state of the pressure control direction control valve 111 is maintained even during snow removal, and is released when the snow removal device 1 is fixed in an elevated state after completing snow removal.

In FIG. 2 and FIG. 3, reference numeral "P" denotes (Pump), and an arrow marked on the lift cylinder 101 indicates the piston moving direction of the lift cylinder 101 when the snow plow 1 descends.

The pressure control direction control valve 111 includes a solenoid valve and a pair of check valves installed so that flow in any one direction can be selectively performed for the bidirectional flow of the working oil.

The preset hydraulic pressure is input to the pressure control valve 113, and the lifting pressure is applied to the lift cylinder 101 with respect to the load of the snow removing machine 1 by this set pressure. Further, when the set pressure is reached, the lifting pressure is adjusted within the set pressure by returning the working oil to the tank 102 for the lifting hydraulic pressure exceeded through the pressure control valve 113. Here, the pressure control valve 113 is a relief valve.

Accordingly, the load of the snow blower 1 through the lift cylinder 101 is reduced to the lifting pressure imposed by the set pressure of the pressure control valve 113, wherein the load of the snow blower 1 is subtracted from the actual load. You will have as much load as the rest. For example, if the actual load of the snowplow 1 is 1,000kg and the lifting pressure is set to 900kg, the load of the snowplow 1 is 100kg.

Here, the set pressure of the pressure control valve 113 may be set in a plurality or a single step, the step of the set pressure may be selected by the controller 114 having a switch, a button or a dial.

The second throttle valve 112 controls the flow of the hydraulic oil flowing into the pressure control valve 113 through the direction control valve 111 for pressure adjustment to perform the hydraulic oil return operation of the pressure control valve 113 finely and precisely. Be sure to Therefore, the adjustment of the hydraulic oil pressure with respect to the set pressure in the pressure control valve 113 proceeds precisely, the lifting pressure is also precisely adjusted.

In addition, as shown in FIG. 3, the controller 114 is provided to control the pressure regulating means and the pressureless device such as the pressure regulating direction control valve 111, the second throttle valve 112, and the pressure control valve 113.

The controller 114 is installed to be set in a plurality of stages with respect to the set pressure of the pressure control valve 113 through a switch, a button or a dial. As an example, 0 to 10 steps are set, and the "0" step is a step in which the load of the snow plow 1 is completely transmitted to the ground pressure of the blade 3 in a no-pressure state, and the "10" step raises the snow plow 1. It is divided into steps. The remaining "1-9" steps are made so that the lifting pressure is imposed by varying the set pressure step by step. This is to obtain an optimal snow removal result by changing the ground pressure of the blade (3) according to various environments, such as the amount of snow accumulated at the time of snow removal, the snow state of the accumulated degree of freezing.

In addition, the controller 114 also controls the pressure-free device installed in conjunction with the pressure control direction control valve 111, thereby controlling the operation of the pressure-free device during the lifting and lowering of the snow removing machine 1, and the direction control valve 111 for pressure adjustment. To control the no-pressure state.

The direction control valve 106 selectively opens and closes the supply line 104 and the return line 105 to control the raising and lowering operation of the snow removing machine 1, and switches the flow direction of the hydraulic oil to raise and lower the snow making machine 1. It controls the lowering and is normally applied solenoid valve.

In addition, the dual check valve 107 by opening the supply line 104 and the return line 105 at the same time limited to the lift cylinder 101 when operating the lift cylinder 101 to be made smoothly. In addition, when the operation of the lift cylinder 101 is stopped, the flow path between the supply line 104 and the return line 105 is automatically blocked to prevent a phenomenon in which the hydraulic pressure of the lift cylinder 101 is randomly leaked.

On the other hand, the road grounding pressure adjusting device 100 of the blade for the snow plow according to the present invention, as shown in Figure 4, to operate in conjunction with the device 200 for adjusting the angle of both sides of the snow removal plate 2 of the snow plow (1). Combined. The hydraulic device of the snowplow 1 is completed by the combined coupling of these road ground pressure adjusting device 100 and the angle adjusting device 200.

Here, the angle adjusting device 200 of the snow removing machine 1 includes a pair of steering cylinders 201, an angle adjusting direction control valve 202, and an angle adjusting relief valve 203, and a snow removing machine 1. To adjust the angles of both sides of the snow removing plate (2).

Here, the angle adjusting device 200 of the snow plow is generally applied as it is, and the coupling relationship is also omitted since a general method is applied as shown in FIG. 3.

Hereinafter will be described the operation of the road surface ground pressure adjusting device of the blade for the snow plow according to the preferred embodiment of the present invention.

First, when the snowplow 1 descends by the lift cylinder 101 by the operation of the controller 114, when the hydraulic fluid is discharged from the lift cylinder 101 to the supply line 104, the counter flow is reversed by the check valve 108. It is blocked and flows to the pressure adjusting return line 110.

At this time, the pressure control direction control valve 111 guides the hydraulic oil introduced into the pressure control return line 110 to the pressure control valve 113 in a state of being forced down by the operation of the pressureless device by the controller 114. .

The hydraulic oil passing through the pressure control direction control valve 111 is introduced into the pressure control valve 113 through the second throttle valve 112 for controlling the flow speed. Subsequently, the hydraulic oil corresponding to the hydraulic pressure exceeding the set pressure after flowing into the pressure control valve 113 by the preset hydraulic pressure is returned to the tank 102 by the pressure control valve 113.

Therefore, the pressure control valve 113 imposes hydraulic pressure by the set pressure on the lift cylinder 101, and the lift cylinder 101 is converted to the lifting pressure of the snow plow 1 with respect to the applied pressure. Here, the non-pressure state of the pressure control direction control valve 111, the hydraulic oil flow rate control of the second throttle valve 112, the hydraulic oil flow control according to the hydraulic pressure of the pressure control valve 113, the selection of the set pressure, etc. 114).

For this reason, the load of the snowplow 1 has a light load which subtracted the set pressure from the actual load, and the impact of the blade 3 generated when the snowplow 1 comes into contact with the road surface 4 is lowered by the snowplow ( It is reduced by the reduced load of 1).

In addition, since the reduced load of the snowplow 1 is maintained during snow removal, when the rising or falling pressure is applied to the blade 3 from the road surface 4 according to the irregular road surface 4 state, the snowplow 1 rises and falls. Descent is as easy as reduced load. That is, when there is an uphill road, a downhill road, or an unevenness, when the raising or lowering pressure is applied to the blade 3 from the road surface 4, the snowplow 1 having a light load is easily lifted or lowered. This can be easily seen by comparing the case where the 1,000 kg snow removing machine 1 moves up and down and the 100 kg snow removing machine 1 moves up and down. For example, the lifting pressure on the lift cylinder 101 is adjusted to 900 kg according to the set pressure of the pressure control valve 113 to reduce the actual load of 100 kg against the snowplow 1 of 1,000 kg. In this state, the snowplow 1 descends and the blade 3 is grounded with the road surface 4, so that the snow blade 1, ie, the blade 3, ascends and descends according to the curvature of the road surface 4 is smoothly made. The ground pressures of (3) and road surface 4 are kept constant.

In addition, the load reduction of the snowplow 1 leads to the reduction of the ground pressure of the road surface 4 and the blade 3 which are in snow removal. Accordingly, the wear of the blade 3 due to the friction between the road surface 4 and the blade 3 is reduced, and the road surface 4 due to the impact of the road surface 4 and the blade 3 according to the irregular road surface 4 state. And breakage of the blade 3 is also reduced.

Here, the load reduction range of the snowplow 1 is made by a plurality of or one set pressure input to the pressure control valve 113, so that many conditions such as the degree of snowfall, the amount of snowfall, the point of snowfall after snowing, etc. According to the set pressure can be changed to determine. At this time, the selection and change of the appropriate set pressure during snow removal are operated by the controller 114.

In addition, the running speed of the snow removal vehicle is also increased as the damage, impact and finishing of the road surface 4 and the blade 3 are reduced. That is, the running speed of the snow removing vehicle under snow removal is improved from the low speed traveling below 40 km / h to the high speed traveling above 60 km / h. Therefore, the speed of snow removal, the amount of snow per hour and the range of snow removal can be improved, and rapid snow removal can be achieved.

On the other hand, when snow removal is completed, the operation for reducing the load of the snow removal machine 1, such as the pressure control direction control valve 111 and the pressure control valve 113, in the state in which the snow removal machine 1 is raised and fixed is canceled. At this time, by operating the controller 114 to raise the snowplow 1, the operation of the pressure control direction control valve 111, the second throttle valve 112, the pressure control valve 113 and the pressureless device is released.

Hereinafter, with reference to the accompanying drawings, the road surface pressure adjustment method of the blade for the snow plow according to the preferred embodiment of the present invention will be described in detail.

Figure 6 is a block diagram showing a method for adjusting the road ground pressure of the blade for the snow plow according to an embodiment of the present invention, Figure 7 is a block diagram showing a preferred embodiment of step S200 of Figure 5, Figure 8 6 is a block diagram illustrating a preferred embodiment of step S300 of FIG.

As shown in FIG. 6, the method for adjusting the road ground pressure of the blade for a snow plow according to the preferred embodiment of the present invention includes a supply line 104 of hydraulic oil installed between the tank 102 and the lift cylinder 101. In the method of adjusting the raising and lowering of the snow removing machine 1 with the snow removing blade 3 attached by the operation of the lift cylinder 101 through the return line 105, the snow removing machine 1 in the raised position is lowered. Step S100; Operating oil discharged from the lift cylinder 101 to the supply line 104 flows into the pressure adjusting return line 110 (S200); Adjusting the hydraulic pressure of the hydraulic oil by a preset pressure by the pressure control valve 113 installed in the pressure adjusting return line 110 (S300); And actuating the hydraulic pressure of the hydraulic oil adjusted in the pressure adjusting return line 110 to the lifting pressure of the lift cylinder 101 (S400).

In the step (S200) in which the hydraulic oil flows into the pressure adjusting return line 110, as shown in FIG. 7, the pressure adjusting direction control valve 111 installed in the pressure adjusting return line 110 when the snowplow 1 descends is pressurized. Switching to a state (S210); Operating oil discharged to the supply line 104 flows to the pressure adjustment direction control valve 111 installed in the pressure adjustment return line 110 by the check valve 108 installed in the supply line 104 (S220); And a step (S230) of adjusting the flow of the hydraulic oil passing through the pressure control direction control valve 111 by the second throttle valve 112 and entering the pressure control valve 113.

Here, in the step (S210) in which the pressure regulating direction control valve 111 is switched to the no-pressure state, the pressure-free device is operated when the snowplow 1 is lowered by the controller 114 to operate the inside of the pressure regulating direction control valve 111. Is forcibly pressed. Accordingly, the pressure adjusting return line 110 is opened through the pressure adjusting direction control valve 111 so that the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 flows into the pressure adjusting return line 110.

In addition, in the step (S220) in which the operating oil of the supply line 104 flows to the pressure control direction control valve 111, the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 due to the lowering of the snow plow 1 is Further progress is impeded by the check valve 108. Therefore, the operating oil of the supply line 104 is introduced into the pressure control direction control valve 111 in a pressureless state.

In addition, in the step (S230) of operating oil flowing into the pressure control valve 113, the hydraulic oil passing through the pressure adjusting direction control valve 111 is controlled by the second throttle valve 112 in a state in which the flow is controlled. Flows into 113.

On the other hand, in the step (S300) in which the hydraulic pressure of the hydraulic oil is adjusted by a predetermined pressure by the pressure control valve 113, as shown in Figure 8, through the pressure control valve 113 so that the hydraulic pressure of the hydraulic oil reaches a set pressure. The hydraulic oil remaining in the pressure adjusting return line 110 (S310); And returning a part of the working oil to the tank 102 through the pressure control valve 113 with respect to the hydraulic pressure of the working oil exceeding the set pressure (S320).

Here, in the step (S320) in which a part of the hydraulic oil is returned to the tank 102, when the hydraulic pressure of the hydraulic oil reaches the set pressure due to the closing of the pressure control valve 113, the hydraulic oil for the hydraulic oil pressure exceeding the set pressure is increased. It is returned to the tank 102 through the adjustment return line 110. At this time, the pressure control valve 113 takes into consideration the lifting pressure to be applied to the lift cylinder 101, and the preset pressure is input, and the pressure control valve 113 is opened and closed according to the set pressure.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100 ... ground pressure regulator 102 ... tank,
104 supply line 105 return line,
110.Return line for pressure adjustment 111.Directional control valve for pressure adjustment,
112 ... 2nd throttle valve 113 ... pressure control valve.

Claims (17)

A snow plow 1 having a supply line 104 and a return line 105 of hydraulic oil is installed between the tank 102 and the lift cylinder 101, and the snow removing blade 3 is attached by the operation of the lift cylinder 101. In the device for adjusting the rising and falling pressure of
The supply line 104 is connected to the pressure adjusting return line 110 is connected to the tank 102,
The pressure adjusting return line 110 returns a part of the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 by the lowering of the snow removing machine 1 to the tank 102 and retains a part thereof. The pressure adjusting means is provided to reduce the load of the snowplow 1 by applying a lifting pressure of the snowplow 1 to the lift cylinder 101.
The pressure adjusting means is a road surface ground pressure adjusting device of the blade for the snowplow, characterized in that the pressure control direction control valve 111 and pressure control valve 113 is included. The method of claim 1,
In the supply line 104 and the return line 105,
A directional control valve (106) mounted to control a flow direction of the hydraulic oil supplied by the motor (103) from the tank (102); And
And a dual check valve 107 mounted to control the flow path of the supply line 104 and the return line 105 to control the flow of the hydraulic oil passing through the directional control valve 106. Ground pressure adjustment device of snow blade The method of claim 2,
The pressure adjusting return line 110 extends from the return line 105 between the direction control valve 106 and the tank 102 and is connected to the supply line 104. Ground pressure regulator. delete The method of claim 1,
The pressure control valve 113 returns a part of the hydraulic oil for the hydraulic pressure exceeding the set pressure to the tank 102 when the hydraulic pressure of the pressure adjusting return line 110 reaches the preset pressure. Road grounding pressure adjusting device for inserting snow plows, characterized in that to adjust the hydraulic pressure of the pressure adjusting return line (110). The method of claim 1,
The pressure control direction control valve 111 is a snow removal machine characterized in that the forced pressureless state when the snowplow 1 is lowered to guide the hydraulic oil of the pressure adjusting return line 110 to the pressure control valve 113. Ground pressure adjustment device for blades. The method according to claim 6,
The pressure control direction control valve 111, road surface ground pressure adjusting device of the blade for the snowplow, characterized in that the pressureless device for inducing a forced pressureless state is installed in conjunction. The method of claim 1,
The pressure adjusting means further includes a second throttle valve 112,
The second throttle valve 112 is installed between the pressure control direction control valve 111 and the pressure control valve 113 to adjust the road ground pressure adjustment device of the blade for the snowplow, characterized in that to control the flow of the hydraulic fluid. . The method according to claim 1 or 7 or 8,
The pressure adjusting means further includes a controller 114,
The controller 114 is a ground ground of the blade for the snowplow, characterized in that installed to control at least one of the pressure control direction control valve 111, the second throttle valve 112, the pressure control valve 113, the pressureless device. Pressure regulator. The method of claim 2,
The lift cylinder 101 and the dual are provided in the supply line 104 to guide the flow of the hydraulic oil discharged from the lift cylinder 101 to the pressure adjusting return line 110 while the snowplow 1 descends. Road grounding pressure adjusting device of the blade for the snowplow, characterized in that it further comprises a check valve (108) installed between the check valve (107). The method of claim 10,
The check valve (108) is a road grounding pressure adjusting device of the blade for a snow plow, characterized in that the first throttle valve (109) for adjusting the flow of the hydraulic fluid flowing through the supply line 104 is installed to interlock. The snowplow 1 to which the snow blade 3 is attached by operation of the said lift cylinder 101 through the supply line 104 and the return line 105 of the hydraulic oil installed between the tank 102 and the lift cylinder 101. In the method of adjusting the rising and falling of
The snow removing machine (1) of the raised position is lowered (S100);
The step of introducing the hydraulic oil discharged from the lift cylinder 101 to the supply line 104 into the pressure adjusting return line 110 (S200);
Adjusting the hydraulic pressure of the hydraulic oil by a preset pressure by a pressure control valve 113 installed at the pressure adjusting return line (S300); And
The hydraulic pressure of the hydraulic fluid adjusted in the pressure adjusting return line 110 is acted as a lifting pressure of the snow removing device 1 of the lift cylinder 101 (S400);
In the step (S200) in which the hydraulic oil flows into the pressure adjusting return line 110, the pressure adjusting direction control valve 111 installed in the pressure adjusting return line 110 when the snowplow 1 descends is switched to a pressureless state. Road surface pressure adjustment method of the blade for the snow plow, characterized in that the step (S210) is included. delete The method of claim 12,
In the step (S200) in which the hydraulic oil flows into the pressure adjusting return line 110, the hydraulic oil discharged into the supply line 104 is returned by the check valve 108 installed in the supply line 104. Road (S220) is a road surface pressure adjustment method of the blade for the snowplow, characterized in that it further comprises the step (S220) flowing to the pressure control direction control valve (111) installed in the line (110). 15. The method of claim 14,
In the step of introducing the hydraulic oil into the pressure adjusting return line 110 (S200), the flow of the hydraulic oil passing through the pressure adjusting direction control valve 111 is adjusted by the second throttle valve 112 to control the pressure. Road surface pressure adjustment method of the blade for the snowplow, characterized in that the step (S230) flowing into the valve 113 is further included. The method of claim 12,
In the step S300 of adjusting the hydraulic pressure of the hydraulic oil by the pressure control valve 113, the hydraulic oil is returned to the pressure adjusting line 110 through the pressure control valve 113 so that the hydraulic pressure of the hydraulic oil reaches a set pressure. Road grounding pressure adjustment method of the blade for a snow plow, characterized in that it comprises a step (S310) remaining in. The method of claim 12,
In the step S300 of adjusting the hydraulic pressure of the hydraulic oil by the pressure control valve 113, a part of the hydraulic oil is transferred to the tank 102 through the pressure control valve 113 with respect to the hydraulic pressure of the hydraulic oil exceeding a set pressure. The road grounding pressure adjusting method of the blade for the snow plow, characterized in that the step (S320) is further included.

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