JPH0247413A - Snow removing truck - Google Patents

Abstract

PURPOSE:To effect follow-up-work of blades on a road surface by arranging a cylinder for regulating the grounding pressure and balance of the blades, and a cylinder for regulating a cutting angle, in a snow removing truck, and by controlling each fluid pressure automatically. CONSTITUTION:The grounding pressure and the left and right grounding pressure balance of blades arranged on the lower surface of the central section of a car body are regulated by a pair of hoist fluid pressure cylinders 2, an the cutting angle of the blades is regulated by a reverse rotation fluid pressure cylinder 3. Then, a set value for input provided by a setting device 4, the grounding pressure signal of a hoist pressure sensor 5 for sensing the fluid pressure of the cylinder 2, and the cutting angle signal of an angle sensor 6 for detecting a relative position between the present angle and gravity working direction of the blades, are compared with each other by a comparator 7. After that, a blade grounding pressure regulating means 9 and a blade angle regulating means 10 are worked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in snow removal trucks, and more specifically, to a pair of hydraulic cylinders for a hoist that adjust the ground pressure of the blade and the balance of the ground pressure on the left and right sides, and to improve the ground pressure of the blade. This invention relates to an improved snow removal truck that automatically controls the fluid pressure of a reversing fluid pressure cylinder that adjusts the cutting angle to cause the blade to follow the road surface.

[Prior Art and Technical Problems to be Solved] As is well known, snow removal trucks are equipped with a blade on the lower center of the chassis that can be pulled up and reversed, and when removing snow from the road, the blade is grounded on the road surface. The vehicle then travels on the road at a snow removal speed appropriate to the snow quality.

By the way, conventional snow removal trucks are equipped with multiple operating levers in the box-shaped driver's cab, and by operating these operating levers, the ground pressure of the blade and the left and right ground pressure balance during snow removal work can be controlled. The cutting angle can be adjusted as appropriate.

Adjustment of the ground pressure or cutting angle of the blade during snow removal work is selectively set as appropriate depending on the snow quality of the road surface. For example, if the snow quality is icy, the ground pressure and cutting angle may be adjusted as appropriate. By increasing the size, it is easier to scrape off the ice burn from the road surface, and if the snow is fresh, the ground contact pressure and cutting angle are reduced to minimize damage to the road surface and reduce the resistance from the snow. Make it smaller (so that the snow can easily flow in the direction of discharge).

On the other hand, the left and right ground pressure of the blades can be adjusted selectively by increasing or decreasing the ground pressure at either end of the blade in the case of roadside snow removal on general roads or roadside snow removal on expressways. This makes it possible to remove snow only from the target roadside area.

However, when setting the ground pressure of the blade, the left and right ground pressure balance, and the cutting angle in the above snow removal truck, it is structurally impractical to directly check the snow removal status of the blade during snow removal work from inside the driver's cab. This is possible, but in reality, the driver operates the vehicle based on the sound of friction between the blade and the road surface and the traces of snow removal seen in the rearview and side mirrors.A skilled driver operates the control lever based on experience and intuition. are doing. However, relying on such a driving method is extremely dangerous as it prevents concentration on work operation.In addition, in snow removal sections where the snow quality is mixed with ice burns and fresh snow, the adjustment of the snow removal operation of the blade becomes slow and the blade does not work evenly. The problem was that snow removal was not possible.

The present invention was made in view of the above-mentioned difficulties with conventional snow removal trucks, and includes a pair of hydraulic cylinders for a hoist that adjusts the ground pressure of the blade and the left and right ground pressure balance, and a reversing cylinder that adjusts the cutting angle of the blade. To provide a snow removal truck capable of performing uniform snow removal regardless of the snow quality in a snow removal area by automatically controlling the fluid pressure of a fluid pressure cylinder to cause a blade to immediately follow the road surface. is a technical issue.

[Means adopted to solve the problem]

The means adopted by the present invention to solve the above problems will be described below with reference to the accompanying drawings.

That is, the present invention adjusts the ground pressure of the blade B disposed on the lower surface of the center of the chassis I and the left and right ground pressure balance by a pair of hydraulic cylinders 2 for hoist, and also reverses the cutting angle of the blade B. Fluid pressure cylinder 3・
3, a setting device 4 for setting and inputting the magnitude of a control signal for controlling the ground pressure of the blade B, the left and right ground pressure balance, and the cutting angle to a desired value; Hoist pressure sensors 5, 5 that are provided corresponding to each of the hoist fluid pressure cylinders 2, 2 and output a ground pressure signal of the blade B by sensing the fluid pressure of each cylinder 2, 2; An angle sensor 6 that outputs a cutting angle signal of the blade B based on the relative positional relationship between the current angle of the blade B and the direction of gravity; a comparator 7 that compares the values of each control signal of the corresponding setting device 4 and outputs a hoist pressure correction command signal and a blade angle correction command signal proportional to each variation amount; 2. A blade ground pressure UiJ node is provided corresponding to 2, and corrects the ground pressure of the blade B in immediate response to the hoist pressure correction command signal value outputted from the comparator 7, thereby balancing the ground pressure of the blade B. The means 9 and 9 are provided correspondingly to the reversing fluid pressure cylinder 3, and adjust the fluid pressure of the fluid pressure cylinder 3 according to the blade angle correction command signal value outputted from the comparator 7, and adjust the fluid pressure of the fluid pressure cylinder 3 to the required value. Either a snow removal truck is equipped with a blade automatic control device including a blade angle 11-node means 10 for changing the blade angle, or the magnitude of the control signal for controlling the ground pressure of the blade B and the left and right ground balance is adjusted. A setting device 41 for setting and inputting a desired value: the hoist fluid pressure cylinder 2;
・The blade B is provided corresponding to each of the hydraulic cylinders 2 and 2, and the setting device 41 outputs the fluid pressure of each fluid pressure cylinder 2.
Blade B so that it is equal to the hoist correction set pressure corresponding to the ground pressure control signal value of
and a blade ground pressure adjustment means 15.15 for adjusting the ground pressure of the blade B and balancing the ground pressure of the blade B; - Containers 16, 16 provided corresponding to each of the fluid pressure cylinders 2, 2 and supplying fluid pressure in a pressurized state to each of the fluid pressure cylinders 2, 2; a setting device 42 for setting and inputting the magnitude of the control signal for tl to a desired value; the fluid pressure of each hoist fluid pressure cylinder 2.2 corresponding to the ground pressure control signal value of the blade B output from the setting device 42; Each container 1 is adjusted to be equal to the hoist correction set pressure
6. By employing a snow removal truck equipped with an automatic blade control device comprising blade ground pressure adjustment means 17 for modifying the ground pressure of blade B via 16.
The above technical problem was solved.

〔Example〕

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

In FIGS. 1 to 7, the reference numeral B indicates a blade disposed in a single flow pattern on the lower surface of the center of the chassis 1 of the snow removal truck, and a pair of hoisting fluid blades attached to both sides of the chassis 1. The ground pressure (
Pressure against the road surface) and left and right ground pressure balance are adjusted, and the cutting angle is adjusted by a pair of reversing fluid pressure cylinders 3, 3 attached to both the left and right sides of the blade B.

The ground pressure and left and right ground pressure balance during operation of the blade B, as well as the cutting angle are set by a dial-type setting device 4 provided in the driver's cab. This setting device 4 is
It is equipped with a ground pressure dial 4a, a cutting angle dial 4b, and a balance dial 4c, and the ground pressure dial 4a allows setting the ground pressure of the blade B in the range of 0 to 140 kg/cd, and the cutting angle dial 4b allows setting the ground pressure of the blade B in the range of 0 to 140 kg/cd. The angle can be set in the range of 70'' to 90°.Furthermore, the balance dial 4c can be set to, for example, L (left) 2.
'' scale, the left and right ground pressure balance of the blade B can be set at a ratio of L:R-3 near.

The control signal values set by the respective dials 4a, 4b, and 4c are output as voltage signals to a comparator 7, which will be described later.

The reference numeral 5 indicates a hoist pressure sensor provided corresponding to each hoist fluid pressure cylinder 2.

Each of these pressure sensors 5 detects the ground pressure value of the blade B during snow removal work by sensing the fluid pressure of the cylinder, and outputs each ground pressure value to the comparator 7 as a voltage signal.

The reference numeral 6 indicates an angle sensor provided on the back surface of the blade B. This angle sensor 6 detects the cutting angle value of the blade B based on the relative positional relationship between the current angle of the blade B and the direction of gravity action during snow removal work, and outputs the cutting angle value to the comparator 7 as a voltage signal. .

The comparator 7 compares the signal values of each pressure sensor 5, 5 and angle sensor 6 with the value of each control signal of the setting device 4 corresponding thereto, and generates a hoist pressure command signal proportional to each variation amount. The fluid pressure cylinder 2 for each hoist is set as an excitation signal.
・The solenoid control pulp outputs to the solenoid control pulps 8, 8 for 2 and the high-speed response solenoid valves 9, 9 which are the blade ground pressure adjustment means, and the solenoid control pulp which is the blade angle 1-node means for the reversing fluid pressure cylinder 3. A blade angle correction command signal is output as an excitation signal to the IO.

The reference numeral 8 indicates a high-speed response solenoid valve 9, which will be described later.
This is a solenoid control pulp provided corresponding to each of 9. These valves 8, 8 are in a neutral state (non-energized state L).
! In i), when the forward switching solenoids 8a, 8a are excited by the excitation signal from the comparator 7, fluid is supplied in the direction of extending the piston rods 2a, 2a. However, when the reverse direction switching solenoids 8b and 8b are energized when the snow removal truck is forwarding, the piston rod 2a
・Supply fluid in a direction that causes 2a to contract.

Reference numeral 9 indicates blade ground pressure adjusting means provided corresponding to each hoist fluid pressure cylinder 2, and in this embodiment, a magnetic valve is used for high-speed response. Each of these high-speed response solenoid valves 9 includes a 1'F4 magnetically operated valve 91 that allows and blocks the supply of fluid to the cylinder 2, and a 1'F4 magnetically operated valve 91 that allows and blocks the supply of fluid to the cylinder 2, and a 1'F4 magnetically operated valve 91 that prevents and blocks the external discharge of the supplied fluid in the cylinder 2 that is supplied by the operated valve 91. In the non-excited state, the first operating valve 91 blocks the supply of fluid to the cylinder 2, while the second operating valve 92 blocks the supply of fluid in the cylinder 2. The fluid in the cylinder 2 is returned to the tank T by allowing the fluid to be discharged to the outside. However, when excited by the excitation signal from the comparator 7, the first operation valve 91 allows fluid to be supplied to the cylinder 2, while the second operation valve 92 prevents the supply fluid in the cylinder 2 from being discharged to the outside. The fluid is supplied to each cylinder 2.

The symbol 1O indicates the reversing fluid pressure cylinder 3.
The blade angle adjusting means is provided in correspondence with No. 3, and in this embodiment has a similar configuration to the solenoid control valve for the hoist fluid pressure cylinders 2. This valve 10 is in the neutral state j1! (in the non-excited state), when the forward switching solenoid 10a is excited by the excitation signal from the comparison a7, the piston rod 3a
- Supply fluid in the direction of extending 3a. However, due to the excitation signal from the comparator 7, the reverse direction switching solenoid t
When ab is excited, fluid is supplied in a direction that causes the piston rods 3a to contract.

Reference numeral 11 designates a solenoid-controlled relief valve that acts as a safety valve in the circuit of the automatic blade control system in the truck of this embodiment.

This leaf valve 11 operates when the solenoid control valves 8, 8, and 10 of the hoist or reversing fluid pressure cylinders 2 and 3 are in the neutral state, or when the solenoid control valves 8 and 10 of each hoist fluid pressure cylinder 2 and 2
・It is configured to operate when the forward switching solenoids 8a, 8a of 8 are in an energized state, and the high-speed response solenoid valves 9, 9 are in a non-energized state to release fluid from the pump P to the tank T. .

According to the truck of the first embodiment, the ground pressure of the blade B and the left and right ground pressure balance during snow removal work are adjusted as follows (see FIGS. 5 to 7).

That is, in the case of ground pressure, as shown in FIG. 5, the forward switching solenoids 8a, 8a of each solenoid control valve 8, 8 and each high-speed response solenoid valve 9, 9 are energized, and each hoist fluid pressure cylinder is energized. When the ground pressure signal value corresponding to the snow quality condition of the snow removal section outputted from each pressure sensor 5.5 is fed back to the comparator 7 and inputted in a state where the fluid supply to 2.2 is allowed, the comparison is performed. Vessel 7
compares the value of the control signal set by the setting device 4 with the ground pressure signal value. When the ground pressure signal value exceeds the control signal value, the comparator 7
At the same time, the output of the excitation signal to the As a result, each solenoid valve 9 returns to its non-excited state, and the cylinder 2
At the same time, the fluid in the cylinders 2 and 2 is discharged to the tank T (see Fig. 6), so that the fluid pressure in each cylinder 2 and 2 becomes lower than the ground pressure signal value. Fixed. Conversely, when the ground pressure signal value becomes lower than the control signal value, the comparator 7 outputs an excitation signal to the magnetic valves 9 in response to each high speed response 1. As a result, each solenoid valve 9 operates in an excited state to allow fluid to be supplied to each cylinder 2, 2, and thus the fluid pressure in cylinder 2, 2 is corrected so as to exceed the ground pressure signal value. (See Figure 5)
.

In the case of the above ground pressure, an excitation signal was simultaneously output to each cylinder 2.2 and the corresponding high-speed response solenoid valve 9.9, but
In the case of left and right ground pressure balance, the left and right ground pressure of blade B can be adjusted by outputting an excitation signal to each solenoid valve 9 separately to allow or block fluid supply to each cylinder 2, 2 independently. Balance is adjusted.

On the other hand, the cutting angle of the blade B during snow removal work is adjusted as follows.

That is, in FIG. 4, when the forward switching solenoid 10a of the solenoid control valve 10 is energized, the cutting angle signal corresponding to the snow quality condition in the snow removal section output from the angle sensor 6 is fed back to the comparator 7. When inputted, the comparator 7 compares the value of the control signal set by the setting device 4 and the cutting angle signal value. Therefore, for example, when the cutting angle signal value exceeds the control signal value, the comparator 7 outputs an excitation signal to the reverse direction switching solenoid 10b of the cylinder 10. As a result, each cylinder 3 supplies fluid in the direction in which the piston rods 3a contract, thereby adjusting the cutting angle signal value to be equal to the control signal value. Conversely, if the cutting angle signal value is lower than the control signal value, the comparator 7 outputs an excitation signal to the forward switching solenoid 10a of each valve 3. As a result, the forward direction switching solenoid 10a of each valve 3, 3 is energized and fluid is supplied to each cylinder 3, 3 in the direction of extending the piston rod 3a, 3a, so that the cutting angle signal value changes to the control signal. is adjusted to be equal to the value of Then, when the cutting angle signal value becomes equal to the control signal value, the comparator 7
The output of the excitation signal to the a-fob is stopped, and the valve 10 returns to the neutral state.

Therefore, the fluid pressure of the hoist fluid pressure cylinders 2, 2, the set value of the setting device 4 is the same as the ground pressure signal value from each pressure sensor 5, which is detected according to the snow quality condition in the snow removal section. High-speed response 1i magnetic valve 9・
Similarly, the fluid pressure of the reversing fluid pressure cylinders 3 and 3 is adjusted by controlling the angle sensors 9 simultaneously or separately, and the set value of the setting device 4 is adjusted by controlling the angle sensor 4 according to the snow quality condition in the snow removal section. Since the cutting angle signal value is adjusted by controlling the solenoid control valve 10 using an electric signal so as to be the same as the cutting angle signal value from 6, the snow removal operation of the blade can be quickly adjusted in accordance with the snow quality condition of the snow removal section. Moreover, since this is done automatically, the blades can immediately follow the road surface and remove snow evenly, and it has the advantage that it does not damage the road surface even if the road surface has gradual changes in ups and downs.

As shown in FIGS. 8 to 13, the device of the second embodiment has a setting device 41 equipped with a ground pressure dial 4a and a balance dial 4c in place of the setting device 4 of the device of the first embodiment.
In addition, pressure reducing valves 15 with electromagnetic proportional relief are used in place of the high-speed response electromagnetic valves 9.

Each electromagnetic proportional relief pressure reducing valve 15, 15 corresponds to the ground pressure control signal value of the blade B and the left and right ground pressure control signal values set by the setting device 41, as shown in FIGS. 11 to 13. Hold the hoist correction set pressure as relief pressure.

Then, each cylinder 2, 2 until the fluid pressure supplied to each hoist fluid pressure cylinder 2, 2 exceeds the relief pressure.
However, when the fluid pressure exceeds the relief pressure, the fluid supply to each cylinder 2 is blocked, and at the same time, the fluid in the cylinders 2 and 2 is discharged to the tank T. The fluid pressure in each cylinder 2 is controlled to adjust the ground pressure of the blade B and the left and right ground pressure balance.

As shown in FIGS. 14 to 18, the device of the third embodiment uses a setting device 42 equipped with only a ground pressure dial 4a in place of the setting device 4 of the device of the first embodiment, and each high-speed response electromagnetic Instead of the valves 9 and 9, the fluid supplied to each hoist fluid pressure cylinder 2 and 2 is stored in a pressurized state and the cylinder 2 is
- A container (accumulator) for replenishing 2 is used, and an electromagnetic proportional relief valve 17 is used in place of the solenoid control relief pulp 11.

The magnetic proportional relief valve 17 holds the hoist correction set pressure corresponding to the ground pressure control signal value of the blade B set by the setting device 42 as a relief pressure. Then, only when the fluid pressure supplied to each cylinder 2, 2 and each container 16, 16 exceeds the relief pressure, the fluid supplied to each cylinder 2, 2 and each container 16, 16 is returned to the tank T, and then The ground pressure of the blade B is adjusted by controlling the fluid pressure of each cylinder 2.

The blade automatic control device of this embodiment is generally configured as described above, but the present invention is by no means limited to the above-mentioned embodiment, and configuration additions and design changes are possible within the scope of the claims. For example, in the device of the first embodiment, the pressure balance dial 4C is configured to be set at the left and right ratios, but the dial 4c may also be configured to be able to set pressure increases for each of the left and right sides. Of course, in the second embodiment of the device, it is natural to use two dials that can set the right ground pressure and left ground pressure separately, and to have the signal of each setting value held in the pressure reducing valve with electromagnetic proportional relief. This is where the invention is planned.

[Effects of the Invention] As described above with reference to the embodiments, according to the automatic blade control device of the present invention, the fluid pressure of each hoist fluid pressure cylinder is controlled by the signal value output from the pressure sensor and the control signal of the setting device. The ground pressure of the blade is corrected by the hoist pressure correction command signal from the comparator which is proportional to the amount of deviation from the value.
The ground pressure of the blade is adjusted by a blade pressure adjustment means that reacts immediately, and the fluid pressure of the reversing fluid pressure cylinder is adjusted by the amount of variation between the signal value output from the angle sensor and the value of the control signal of the setting device. 11 by the blade angle adjusting means which responds to the blade angle correction command signal from the comparator proportional to the blade angle by adjusting the fluid pressure of the fluid pressure cylinder to change the blade angle to the required blade angle.
The snow removal operation of the blade is quickly and automatically adjusted according to the snow quality in the snow removal section, so the blade immediately follows the road surface. This makes it possible to always remove snow evenly regardless of the condition.

In addition, the ground pressure of the blade is corrected so that the current fluid pressure of the hoist fluid pressure cylinder is equal to the hoist correction set pressure corresponding to the ground pressure control signal value of the setter and the left and right ground pressure control signal values, and the ground pressure of the blade is If a blade ground pressure adjustment means that balances the ground pressure is adopted, the snow removal operation adjustment for the blade ground pressure and left and right ground pressure balance will be quickly and automatically performed, and the blade will immediately follow the road surface. Therefore, it is possible to always remove snow evenly regardless of the snow condition in the snow removal section, and since the structure is simple, it can be manufactured economically and at low cost.

Furthermore, the ground pressure of the blade is adjusted through a container provided corresponding to the cylinder so that the current fluid pressure of the hoist fluid pressure cylinder becomes equal to the corrected setting pressure for the hoist corresponding to the ground pressure control signal value of the setting device. If a means for adjusting the blade contact pressure is adopted, the snow removal operation adjustment of the blade contact pressure will be performed quickly and automatically, and the blade will follow the road surface. In addition to making it possible to always remove snow evenly, the structure is simple and can be manufactured economically and at low cost.

[Brief explanation of the drawing]

Fig. 1 is an external plan view showing the snow removal truck of the first embodiment, Fig. 2 is a side view of the same snow removal truck in the snow removal operation state, and Fig. 3 is the blade automatic control device of the truck of the first embodiment. Fig. 4 is a diagram of the fluid system in the automatic blade control system of the truck of this first embodiment; Fig. 5 is a high-speed response diagram showing a state in which fluid supply to each hoist fluid pressure cylinder is allowed. 6 is an explanatory diagram of the operation of the solenoid valve, FIG. 6 is an explanatory diagram of the operation of the high-speed response solenoid valve showing the state in which fluid supply to each hoist fluid pressure cylinder is blocked, and FIG. FIG. 8 is an external plan view showing the snow removal truck of the second embodiment, FIG. 9 is a side view of the same snow removal truck in the snow removal operation state, and FIG. 10 is a block diagram showing the signal transmission of the control device. Fig. 11 is a fluid system diagram of the blade automatic control device of the second embodiment truck, and Fig. 12 shows the fluid flow to each hoist fluid pressure cylinder. FIG. 13 is an explanatory diagram of the operation of the pressure reducing valve with electromagnetic proportional relief showing a state in which supply is allowed, and FIG. Figure 14 is an external plan view showing the snow removal truck of the third embodiment, Figure 15 is a side view of the same snow removal truck in the snow removal operation state, and Figure 1
Figure 6 is an external plan view of the setting device used in the device of the third embodiment;
FIG. 17 is a fluid system diagram of the automatic blade control device for a truck according to the third embodiment, and FIG. 18 is an explanatory diagram of the operation of the device. 1--Chassis, 2--Fluid pressure cylinder for hoist, 3...Fluid pressure cylinder for reversal, 4, 41, 42,--Setter, 5--Pressure sensor, 6--Angle sensor, 7- --Comparator, 9.-High-speed response solenoid valve, 10-.Solenoid control valve (for reversing fluid pressure cylinder) 15-m-Pressure reducing valve with electromagnetic proportional relief, 16.-Container, 17-.-Solenoid proportional relief valve.

Claims (1)

[Scope of Claims] [1] The ground pressure of the blade B disposed on the lower surface of the center of the chassis 1 and the left and right ground pressure balance are adjusted by a pair of fluid pressure cylinders 2 for hoisting, and the cutting of the blade B is In a snow removal truck whose angle is adjusted by a reversing fluid pressure cylinder 3, there is a setting device 4 for setting and inputting the magnitude of a control signal for controlling the ground pressure of the blade B, the left and right ground pressure balance, and the cutting angle to desired values. and; Hoist pressure sensors 5, 5 that are provided corresponding to each of the hoist fluid pressure cylinders 2, 2 and output a ground pressure signal of the blade B by sensing the fluid pressure of each cylinder 2, 2. and; An angle sensor 6 that outputs a cutting angle signal of the blade B based on the relative positional relationship between the current angle of the blade B and the direction of gravity action; Each signal value output by the pressure sensors 5, 5 and the angle sensor 6. and a comparator 7 that compares the value of each control signal of the setting device 4 corresponding thereto and outputs a hoist pressure correction command signal and a blade angle correction command signal proportional to each variation amount; A blade is provided corresponding to each of the pressure cylinders 2, 2, and corrects the ground pressure of the blade B in immediate response to the hoist pressure correction command signal value outputted from the comparator 7, thereby balancing the ground pressure of the blade B. Ground pressure adjusting means 9, 9; provided corresponding to the reversing fluid pressure cylinder 3, and adjusting the fluid pressure of the fluid pressure cylinder 3 according to the blade angle correction command signal value outputted by the comparator 7. A snow removal truck characterized in that it is equipped with an automatic blade control device including a blade angle adjusting means 10 for changing the blade angle to a required blade angle. [2] In a snow removal truck in which the ground pressure of the blade B disposed on the lower surface of the center of the chassis 1 and the left and right ground pressure balance are adjusted by a pair of hoist fluid pressure cylinders 2, the ground pressure of the blade B and the left and right ground pressure balance are adjusted. a setting device 41 for setting and inputting the magnitude of a control signal for controlling the grounding balance to a desired value; provided corresponding to each of the hoist fluid pressure cylinders 2, 2; Correcting the ground pressure of blade B so that the fluid pressure is equal to the hoist correction setting pressure corresponding to the ground pressure control signal value of blade B and the left and right ground pressure control signal values output by the setting device 41,
A snow removal truck characterized in that it is equipped with a blade automatic control device including a blade ground pressure adjustment means 15.15 for balancing the ground pressure of the blade B. [3] In a snow removal truck in which the ground pressure of the blade B disposed on the lower surface of the center of the chassis 1 is adjusted by a pair of hoist fluid pressure cylinders 2. containers 16, 16, which are provided to supply fluid pressure in a pressurized state to each of the fluid pressure cylinders 2, 2; setting and inputting the magnitude of a control signal that controls the ground pressure of the blade B to a desired value; a setter 42; and a setter 42 for controlling each container 1 so that the fluid pressure of each hoist fluid pressure cylinder 2.2 becomes equal to the hoist correction set pressure corresponding to the ground pressure control signal value of the blade B outputted by the setter 42;
6. A snow removal truck characterized in that it is equipped with a blade automatic control device including a blade ground pressure adjusting means 17 for modifying the ground pressure of the blade B via the blade B.