JPH0713363B2 - Operation board type blade switching device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation board type blade switching device for simplifying the operation of a snow removing blade, which can improve the operability and safety of a snow removing vehicle equipped with a snow removing blade.

[0002]

2. Description of the Related Art The economic development of modern Japan depends largely on the development of automobile transportation. Now, the maintenance of the road traffic network
It is regarded as one of the most important issues for government agencies. However, roads are not just good, and they will hinder actual traffic if they are not properly managed. For example, when snow accumulates on the road, the road surface becomes very slippery, the traffic environment deteriorates significantly, and contact accidents and road congestion frequently occur. For this reason, in heavy snow areas, road managers are partially obliged to remove snow from roads.

When a road administrator actually removes snow from a road, he or she often uses a snowplow equipped with a snowplow blade or the like. Snow removal work using a snow plow is a small number of people,
This is because a wide range can be performed in a short time and high efficiency is achieved. However, there are some drawbacks in snow removal work using a snow plow, and among them, poor operability is a major drawback leading to safety problems.

This is because at present, the operation of the snow removal blades of a snow removal vehicle is performed by operating several hydraulic cylinders provided for raising and lowering and turning left and right from the operator's cab. Since it is quite complicated, if the blade tends to catch an obstacle on the road or the side of the road during snow removal, the attention to the surroundings becomes insufficient due to the attention to the avoidance operation of the blade, This is because the risk of an accident increases.

Depending on the amount of snow on the road surface, it may be more effective to remove snow while traveling while changing the left and right ground pressures of the blades. However, such an operation must be performed by operating a hydraulic cylinder from the cab. This was not the case and forced the driver to be overloaded, which was a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of conventional snow plows, and its object is to improve the operability of the snow plow. Aims at facilitating the operation of the entire snow removal vehicle by semi-automating the operation of the blade.

[0007]

In the present invention, the operation board in the driver's cab is provided with a forwarding mode switch, a work standby mode switch, a grounding mode switch, and a pressing mode switch. When the forwarding mode switch is selected, it is provided on the blade. The reversing / returning mechanism places the blade in the reversing position, and at the same time the blade lifting mechanism raises the blade to the upper standby position.When the work standby mode switch is selected, the blade reversing / returning mechanism returns the blade to the working position. When selecting the grounding mode switch, the blade lifting mechanism lowers the blade to the grounding position, and when selecting the pressing mode switch,
By the blade lifting mechanism pressing the blade against the ground with a predetermined ground pressure, the operation of the blade of the snow removal vehicle is semi-automated, and an operation board type blade switching device that enhances the operability of the snow removal vehicle is provided.

[0008]

EXAMPLES The present invention will be described below based on examples.

As shown in FIGS. 1 to 4, below the chassis of the snow removal vehicle M, right and left hoist fluid pressure cylinders S ₁₂ and S are provided.
₂₂ is laid vertically. Left and right hoist fluid pressure cylinder S ₁₂・
As for S ₂₂ , the right hoist fluid pressure cylinder S ₂₂ is slightly forward, the left hoist fluid pressure cylinder S ₁₂ is slightly back,
It is installed in a different position. Left and right blade suspensions (not shown) are supported on the respective rod ends of the left and right hoist fluid pressure cylinders S ₁₂ and S ₂₂ , and the left blade suspension is lowered by the extension of the left hoist fluid pressure cylinder S ₁₂ .
The extension of the right hoist fluid pressure cylinder S ₂₂ lowers the right blade suspension. On the contrary, when the left hoist fluid pressure cylinder S ₁₂ is retracted, the left blade suspension is raised, and when the right hoist fluid pressure cylinder S ₂₂ is retracted, the right blade suspension is raised.

Below the left blade suspension and the right blade suspension, a blade support (not shown) is spanned by a clearance pivot. To this blade support body, the rods of the fluid pressure cylinders S ₁₁ and S ₂₁ for left-right reversal disposed forwardly on the left and right sides of the blade support are connected, and the fluid pressure cylinder S ₁₁ for left-right reversal is connected. - the expansion of S _21, is pivotable back and forth. A left blade plate B ₁ and a right blade plate B ₂ are slidably supported on the front surface of the blade support body. These left and right blade plates B ₁
· B ₂ is adapted to the expansion and contraction of the expansion fluid pressure cylinder S ₁₃ · S ₂₃ described later, the blades plates B ₁ · B ₂ is equidistant move always in the opposite direction. The left blade plate B ₁
When slides to the right and the right blade plate B ₂ slides to the left,
The right blade plate B ₂ covers the left blade plate B ₁ so that the distance between both ends of both blade plates B ₁ and B ₂ can be shortened. Then, by these left and right blade plates B ₁ and B ₂ ,
The blade B is arranged in a one-stream state such that the right side is ahead of the left side.

These left-right reversing fluid pressure cylinders S ₁₁ and S
_21, expansion and contraction of the left and right hoist hydraulic cylinder S ₁₂ · S _22, as shown in FIG. 9, the cylinder and the fluid pressure pump, by the operation of the electromagnetic switching valve disposed in the fluid path between the fluid reservoir To be achieved. To describe this in detail, both main fluid paths for fluid introduction and fluid recirculation, which are connected to the fluid pressure pump and the fluid tank, are provided, and the left and right reversing fluid pressure cylinders S ₁₁ , S ₂₁ , left The cylinder side path and the bottom side path of the fluid pressure cylinder S ₁₂ for hoist and the fluid pressure cylinder S ₂₂ for right hoist are connected. The connection between the cylinder side path, the bottom side path and the main fluid path is switched by the operation of the electromagnetic switching valve, whereby each cylinder expands and contracts.

Fluid pressure cylinders S ₁₁ and S for both left and right inversion
₁₂ , the bottom side path and the cylinder side path are the same. The reversing electromagnetic switching valve 21 arranged at the contact points of the bottom side path and the cylinder side path, and the main fluid path for introduction and the main fluid path for recirculation, is operated by the solenoid 21a. And the bottom side path are connected, and the fluid recirculation side main path and the cylinder side path are connected. As a result, the left-right reversing fluid pressure cylinders S ₁₁ and S ₂₁ are extended, the left and right blade plates B ₁ and B ₂ are simultaneously rotated so that the blade surfaces face downward, and the blade B is eventually reversed. Also, the solenoid switching valve 21
Operates the solenoid 21b to connect the fluid recirculation side main path to the bottom side path and the fluid introduction side main path to the cylinder side path. Accordingly, the cylinders S ₁₁ and S ₂₁ are retracted, the left and right blade plates B ₁ and B ₂ are simultaneously rotated so that the blade surfaces thereof face forward, and eventually the blade B returns to the snow removing work position.

An electromagnetic switching valve 22 for the left hoist is arranged at the contact points of each of the bottom side and cylinder side paths connected to the left hoist fluid pressure cylinder S ₁₂ and two main paths for fluid introduction and fluid recirculation. To be done. In addition, the left hoist lock solenoid switching valve 26 is provided in each of the routes on the bottom side and the cylinder side.
・ 26 are installed. Like the reversing solenoid switching valve 21, the left hoist solenoid switching valve 22 is operated by the solenoid 22a.
The fluid pressure side main path is connected to the bottom side path, the fluid recirculation side main path is connected to the cylinder side path, and the fluid pressure cylinder S ₁₂
Is extended and the solenoid 22b is actuated,
The fluid recirculation side main path and the bottom side path are connected, the fluid introduction side main path and the cylinder side path are connected, and the fluid pressure cylinder S ₁₂ is contracted. On the other hand, the left hoist lock solenoid directional control valves 26, 26 are energized and excited by the solenoid during the expansion and contraction operation of the fluid pressure cylinder S ₁₂ to open both the bottom side and the cylinder side paths. the before and after expansion and contraction of the S _12, the bottom side, the new rata fluid to the cylinder side of both pathways was closed to prevent reflux of fluid introduced into the cylinder S _12. At the same time the cylinder S ₁₂ in The inflow is blocked and the expansion and contraction of the fluid pressure cylinder S ₁₂ is locked.

Like the left hoist fluid pressure cylinder S ₁₂ , the contact points between the bottom side and cylinder side paths connected to the right hoist fluid pressure cylinder S ₂₂ and the two main paths for fluid introduction and fluid recirculation are the same as those for the left hoist fluid pressure cylinder S ₁₂ . An electromagnetic switching valve 23 for the right hoist is provided. Further, right hoist lock electromagnetic switching valves 27, 27 are disposed on the respective paths on the bottom side and the cylinder side. The right hoist solenoid switching valve 23, like the left hoist solenoid switching valve 22, connects the fluid introduction side main path and the bottom side path and connects the fluid recirculation side main path and the cylinder side path by the operation of the solenoid 23a. The fluid pressure cylinder S ₂₂ is expanded, and the solenoid 23b is operated to connect the fluid recirculation side main path and the bottom side path, connect the fluid introduction side main path and the cylinder side path, and retract the fluid pressure cylinder S ₂₂ . Further, the right hoist lock solenoid directional control valves 27, 27, like the left hoist lock solenoid directional control valves 26, 26, are energized and energized by the solenoid during expansion / contraction of the fluid pressure cylinder S ₂₂ to cause the bottom side and the cylinder side to move. Both paths are opened, but before and after the expansion / contraction operation of the fluid pressure cylinder S ₂₂ , both the paths on the bottom side and the cylinder side are closed to prevent the circulation of the fluid introduced into the cylinder S ₂₂ and at the same time to the cylinder S ₂₂ . The flow of new fluid into the inside of ₂₂ is blocked, and the expansion and contraction of the fluid pressure cylinder S ₂₂ is locked.

Further, in this embodiment, the left blade plate B ₁ and the right blade plate B ₂ are slidable laterally in opposite directions. That is, the expansion / contraction fluid pressure cylinders S ₁₃ and S ₂₃ are installed between the left blade plate B ₁ and the blade support, and between the right blade plate B ₂ and the blade support, respectively. By simultaneously expanding and contracting the pressure cylinders S ₁₃ and S ₂₃ , the left and right blade plates B ₁ and B ₂ can simultaneously project outward or narrow in the vehicle direction. Such expansion / contraction fluid pressure cylinders S ₁₃ · S
The expansion and contraction of ₂₃ is also achieved by switching the connection of the main passages for fluid introduction and fluid recirculation of the solenoid operated directional control valve 25 operated by the solenoids 25a and 25b, and the respective routes on the bottom side and the cylinder side.

Furthermore, in this embodiment, the snow removal vehicle M
An operation board 1 and an operation panel (not shown) for setting a blade width expansion / contraction value are provided in the driver's cab. Operation board 1
Includes a push button type forwarding mode switch 2, a work standby mode switch 3, a grounding mode switch 4, a pressing mode switch 5, a temporary avoidance mode switch 6, and a slide knob type grounding pressure setting device 7 and a left-right balance setting device 8. Equipped with. Each of the forwarding mode switch 2, the work standby mode switch 3, the grounding mode switch 4, the pressing mode switch 5 and the temporary avoidance mode switch 6 has a display such as forwarding, working standby, grounding, and pressing on the button. Then you can see which button. Immediately below the ground pressure setting device 7 and the left / right balance setting device 8, there are indications of pressing pressure and left / right balance, respectively, so that the selection can be made correctly. Further, a scale is provided just above the ground pressure setting device 7 and the left-right balance setting device 8 so that it can be seen at a glance which setting value is currently selected.

Further, these switches and setting devices 2.3.
4, 5, 6, 7, and 8 are connected to a controller 10 which is a microcomputer. Then, the controller 10 appropriately excites the solenoids according to the inputs to the switches and setting devices 2, 3, 4, 5, 6, 7, 8 to expand and contract each cylinder. Further, in this embodiment, the display 9 is also installed in the driver's cab, and the controller 1
The blade state, which will be described later, detected by the sensor 0 can be displayed in characters.

The structure of this embodiment is roughly as described above, but the actual operation of this embodiment is as follows.

First, a worker rides in the snow removing vehicle M equipped with the apparatus of this embodiment and starts the engine. Then, when the forwarding mode switch 2 of the operation board 1 is pressed, each cylinder expands and contracts, and the blade B is positioned at the upper standby position and is inverted. Hereinafter, this state will be referred to as a forwarding mode state. When the work standby mode switch 3 is pressed in the forwarding mode state, the blade B is returned to the front side while the blade B remains at the upper standby position. This state is called a work standby mode state.

When the ground mode switch 4 is pressed in the forwarding mode, the blade B descends and moves to the ground position, and the blade surface is returned so as to face forward. This state is referred to as a ground mode state. Further, when the pressing mode switch 5 is pressed in the forwarding mode state, the blade B returns so that the blade surface faces forward, and at the same time, the blade B descends and moves to the grounding position, and further touches the ground. fluid pressure is pressurized to the left and right hoist hydraulic cylinder S ₁₂ · S _22, the edge of the blade B is pressed on the ground at a predetermined pressure. This state is called the pressing mode state.

The blade ground pressure in the pressing mode state is selected according to the setting of the ground pressure setting device. In practice, first adjust the fluid pressure in the fluid path connected to all cylinders with the electromagnetic relief valve 24, then arrange the pressure reducing valve 28 and the electromagnetic proportional relief valve 20 in the fluid path connecting to the left and right hoist cylinders. By controlling the discharge pressure of 28 with the proportional relief valve 20, the fluid pressure in the path is kept within a certain range. Then, when the left and right balance setting device is set to make the left contact pressure higher than the right by a predetermined pressure,
Opens the lateral hoist lock selector valve 26, 26, 27, 27 actuates the solenoid 22a-23a switches the electromagnetic switching valve 22, 23, ground contact pressure setter to the left and right hoist hydraulic cylinder S ₁₂ - S ₂₂ After applying the fluid pressure in accordance with the setting, the left hoist lock solenoid directional control valves 26, 26 are opened and the solenoid directional control valve 22 is kept in that state, and the solenoid 23a is stopped and the solenoid directional control valve 23 is turned on. Simultaneously switching and closing the right hoist lock solenoid switching valves 27 and 27, increase the discharge pressure of the pressure reducing valve 28 with the proportional relief valve 20 and set the fluid pressure in the path with the left and right balance setting device rather than the ground pressure setting device setting. By increasing the pressure by the applied pressure, a higher pressure is applied to the left hoist fluid pressure cylinder S _{12 than} to the right hoist fluid pressure cylinder S ₂₂ . In this way, the installation pressure on the left side of the blade can be made higher than that on the right side by a predetermined pressure. The same applies when the right and left balance setters are set so that the right side is higher than the left side.

When the ground mode switch 4 is pressed in the work standby mode, the blade B shifts to the ground mode. Further, when the pressing mode switch 5 is pressed in the work standby mode state, the mode shifts to the pressing mode state. Similarly, when the work standby mode switch 3 or the pressing mode switch 5 is pressed in the grounding mode state, the mode shifts to the work standby mode state or the pressing mode state. The same applies when the work standby mode switch 3 and the ground mode switch 4 are pressed in the pressing mode state.

Further, when the temporary avoidance mode switch 6 is pressed in the pressing mode state, only the right hoist fluid pressure cylinder S ₂₂ is retracted, and the right end portion of the blade is lifted from the ground by a predetermined amount. This state is called a temporary avoidance mode state. Further, even if the temporary avoidance mode switch 6 is pressed in the grounding mode state, the temporary avoidance mode state is entered.

In the actual snow removing work, the worker first runs the snow removing vehicle M in the forwarding mode state, and when the road reaches the road where the snow removing work is to be performed, after setting the ground pressure suitable for snow removal, the worker is in the work standby mode. When the switch 3, the ground mode switch 4, and the pressing mode switch 5 are pressed in this order, the blade B shifts to the work standby mode state, the grounding mode state, and the pressing mode state in this order. When the snow removal vehicle M is run in the pressing mode of the blade B, the snow on the road can be removed.

If there is a step on the road during snow removal work,
When the temporary avoidance mode switch 6 is pressed to move the blade B to the temporary avoidance mode state, the right side of the blade B is slightly lifted up, and the front edge of the blade B gets over the step, so that the blade B is not caught on the step. Can run. After that, when the pressing mode switch 5 is pressed again, the pressing mode is switched to normal snow removal. Further, when the left side of the road is squeezed from the right side, the left and right balance setting device may be set to apply strong ground pressure to the left side.

Further, when a car is parked on the side of the road and it is necessary to slip through a narrow portion, an operating panel (not shown) is operated to expand or contract the fluid pressure cylinder S _13.
To extend and retract the S _23, the blade B by scaling adjusted, it can snow roads spread again blade B pass through the narrowed portion. Further, even when the state of the snow cover is changed, the ground pressure suitable for the snow state can be obtained simply by sliding the knob of the ground pressure setting device to change the setting.

Although the present embodiment is as described above, the present invention is not limited to the above embodiment, and the operation board may have a form as shown in FIGS. 7 and 8, for example. . It should be noted that the push button switches indicated by 1, 2, ..., and 6 in FIG. 7 are those in which the push mode switch and the ground pressure setting device are unified, and the push mode is selected by selecting one of the push button switches. The state is shifted to the state, and the blade is pressed based on the ground pressure predetermined for each of the push button switches indicated by 1, 2, ..., 6.

[0028]

As described above, according to the present invention, the blade of the snow removing vehicle can be operated by simply selecting the switch on the operation board provided in the driver's cab. This operation is
Since it can be performed much easier and in a shorter time than the operation of a large number of levers as in the past, there is no need to worry about the blade operation during the snow removal operation and cause an accident. Moreover, the blade operation is sufficiently adaptable to any situational change, and by adopting the device of the present invention, even unskilled workers can finely remove snow according to the situation.

As described above, the operation board type blade switching device of the present invention has great industrial utility value.

[Brief description of drawings]

FIG. 1 is a side view of a snow removal vehicle of this embodiment in a blade forwarding mode.

FIG. 2 is a side view of the snow removal vehicle of this embodiment in a blade work standby mode.

FIG. 3 is a side view of the snow removing vehicle of this embodiment in a blade grounding mode state.

FIG. 4 is a side view of the snow removing vehicle of the present embodiment in a blade temporary avoidance mode state.

FIG. 5 is a plan view of an operation board according to the present embodiment.

FIG. 6 is a schematic chart of an electric control system in the present embodiment.

FIG. 7 is a plan view of a modified example of the operation board.

FIG. 8 is a plan view of a modified example of the operation board.

FIG. 9 is a path diagram of a fluid pressure path in the present embodiment.

[Explanation of symbols]

 1 Operation board 2 Forward mode switch 3 Work standby mode switch 4 Grounding mode switch 5 Pushing mode switch 6 Temporary avoidance mode switch 7 Ground pressure setting device 8 Left and right balance setting device 9 Display device 10 Controller M Snowplow B blade

Front Page Continuation (72) Inventor Masayuki Takahashi 6-15-12 Shimoyasuda, Maruoka Town, Sakai District, Fukui Prefecture

Claims (9)

[Claims] 1. A device for operating and controlling blades mounted on a snow removal vehicle, wherein an operation board provided in a driver's cab is provided with a forwarding mode switch, a work standby mode switch, a grounding mode switch, and a pressing mode switch. The blade installed below the snow removal vehicle is provided with a blade reversing / returning mechanism and a blade lifting mechanism, and when the forwarding mode switch is selected, the blade reversing / returning mechanism places the blade in the reversing position. In addition, the blade lifting mechanism raises the blade to the upper standby position, and when the work standby mode switch is selected, the blade reversing / returning mechanism returns the blade to the working position, and when the grounding mode switch is selected. The blade lifting mechanism lowers the blade to the grounding position, When the switch is selected, the blade elevating mechanism presses the blade against the ground with a predetermined ground pressure, which is an operation board type blade switching device. 2. An operation board type blade switching device according to claim 1, wherein an indicator for displaying a current state of the blade is installed in the cab. 3. The operation board type blade switching device according to claim 1, wherein a pair of left and right blade lifting mechanisms are provided, and the left or right side of the blade is lifted and lowered according to the operation of each of the left and right blade lifting mechanisms. . 4. The operation board is provided with a temporary avoidance mode switch, and when the temporary avoidance mode switch is selected, the right blade elevating mechanism raises the blade right side. An operation board type blade switching device according to item 3. 5. The operation board includes a ground pressure setting device, and when the pressing mode switch is selected, the left and right blade lifting mechanisms adjust the ground pressure of the blades according to the ground pressure set by the setting device. Item 3. An operation board type blade switching device according to item 3. 6. The operation board is provided with a left and right balance setting device, and when the pressing mode switch is selected, the pressure value set by the balance setting device is further added to either the left or right side of the blade to adjust the left and right sides of the blade. 6. The operation board type blade switching device according to claim 5, wherein the ground pressure has a set difference. 7. When the work standby mode switch is selected, the blade reversing / returning mechanism returns the blade to the working position, the blade elevating mechanism positions the blade at the upper standby position, and the grounding mode switch is selected. Sometimes the blade reversing / returning mechanism positions the blade in the working position, the blade lifting mechanism positions the blade in the grounding position, and when the pressing mode switch is selected, the blade reversing / returning mechanism positions the blade in the working position. 2. The operation board type blade switching device according to claim 1, wherein after the blade is raised, the blade elevating mechanism presses the blade against the ground with a predetermined ground pressure while locating the blade at the grounding position. 8. The blade reversing / returning mechanism includes a reversing fluid pressure cylinder, the blade lifting mechanism includes a hoisting fluid pressure cylinder, and the reversing / returning operation of the blade reversing / returning mechanism is the reversing fluid pressure cylinder. 2. The operation board type blade switching device according to claim 1, wherein the blade ascending / descending operation of the blade elevating / lowering mechanism is caused by the expansion / contraction of the hoist fluid pressure cylinder. 9. The expansion and contraction of the reversing fluid pressure cylinder and the hoisting fluid pressure cylinder is caused by the operation of an electromagnetic switching valve disposed in each fluid path between the cylinder and the main fluid pressure pump. An operation board type blade switching device according to claim 8.