JPH10317340A - Automatic snow brush controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the grounding force of snow brushes on a road surface always at a set value without being affected by brush wear. SOLUTION: An automatic snow brush controller 17 is designed so that the torques of right and left hydraulic motors 3, 4 produced by the grounding loads of right and left snow brushes 18, 19 are kept at an appropriate set value. In that case, the pressure difference between the pressure-oil inlet and outlet of the right and left hydraulic motors 3, 4 is detected by right pressure sensors 12, 14 and left pressure sensors 11, 13, and the difference between the torques of the right and left hydraulic motors 3, 4 and the set value is computed on the basis of input signals from the sensors, so that the torques of the right and left hydraulic motors 3, 4, without being affected by changes in viscosity of operating oil, can be made to agree with the set value by the rising and falling action of the attached hydraulic cylinders 9, 10 of rectilinear type elevating displacement sensors 15, 16 placed on the right and left of the top of the support frame of the snow brushes and used in elevating and lowering operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic control in a snow removal device using a snow brush.

[0002]

2. Description of the Related Art Heretofore, this type is as follows. Although a snow removal device using a snow brush is known, the snow brush is pivotally supported on a single shaft in the same support frame, so that only one hydraulic motor for driving is provided continuously. Adjustment of the ground contact force between the snowbrush and the road surface in a conventional snowbrush snow removal device,
A screw adjustment type using an auxiliary wheel is known. Also,
In the case of Japanese Patent Application No. Hei 8-160841, an automatic control device employing a hydraulic proportional electromagnetic relief valve and a hydraulic electromagnetic check valve without using auxiliary wheels is used.

[0003]

The above-mentioned prior art has the following problems. The ground contact force between the snowbrush and the road surface has to be manually adjusted as appropriate in accordance with the amount of wear of the snowbrush because the screw is adjusted by the auxiliary wheels. Also, even if the automatic control function is adopted by hydraulic pressure, the viscosity of hydraulic oil changes due to environmental changes such as temperature, so pressure loss in the hydraulic piping is a factor,
There is a problem that the actuator does not operate temporarily according to the output signal of the automatic control. The present invention has been made in view of such problems of the conventional technology, and has as its object to provide the following. Left and right snow brush 18,
The automatic control device 17 is provided so that the rotational force of the left and right hydraulic motors 3 and 4 due to the grounding load of 19 maintains an appropriate set value, and the pressure difference between the inlet and outlet of the hydraulic oil of the left and right hydraulic motors 3 and 4 is set to the left. Pressure sensors 11 and 13 and right pressure sensor 1
2, 14 and calculates the difference between the rotational force of the left and right hydraulic motors 3 and 4 and the set value based on the input signal, and is disposed on the right and left upper portions of the snowbrush support frame 20 for ascending and descending. The rotating force of the right and left hydraulic motors 3, 4 matches the set value without being affected by the viscosity change of the hydraulic oil by the raising and lowering operations of the attached hydraulic cylinders 9, 10 of the left and right linear lifting sensors 15, 16 for lifting. It is made to be able to be made.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is as follows. According to the present invention, the left and right hydraulic motors rotating the left and right snow brushes 18 and 19 always maintain the ground force of the left and right snow brushes 18 and 19 in the snow removing operation using the snow brush. The pressure difference between the inlet and outlet of the hydraulic oil of the hydraulic motors 3 and 4 is detected by the left and right pressure sensors 11, 12, 13, and 14 and the signal is input to the automatic control device 17, and The amount of change in the rotational force of the hydraulic motors 3 and 4 is calculated, and if the rotational force of the hydraulic motors 3 and 4 is smaller than the set value, the linear displacement sensor 15 for lifting and lowering disposed on the left and right snow brushes is used. , 16 are appropriately lowered to correct the pressurization. If the rotational force of the hydraulic motors 3, 4 exceeds a set value, the attached hydraulic cylinders 9, 10 are raised. Activate A snow brush automatic controller with automatic controller 17 for pressure compensation.

[0005] In this case, it can be configured as follows. A. The vertical movement of the attached hydraulic cylinders 9 and 10 of the linear displacement sensors for elevation 15 and 16 disposed on the left and right of the support frame 20 of the snowbrush for raising and lowering is controlled by rotating the left and right snowbrushes 18 and 19. Left and right hydraulic motors 3,
4 is configured to detect and calculate the rotational force difference, and to operate the ascending / descending operation as appropriate to maintain the uniformity of the contact width of the left and right snow brushes 18 and 19 with the road surface. B. Regarding the descent time until the left and right snow brushes 18 and 19 reach the road surface from the storage position, the snow brushes 18 and 19 rotate and start descending and descend at high speed until they touch the ground. And the left and right snow brushes 18 and 19 are worn as they are used. In the process of wear, the snow brushes 18 and 19 are disposed on the left and right sides of the snow brush for ascending and descending. The falling time of the attached hydraulic cylinders 9 and 10 of the vertical displacement sensors 15 and 16 for ascending and descending is lowered at a high speed until the snow brush is in contact with the ground as in the case of a new one.
Thereafter, the speed is automatically converted to a low speed and the set condition is maintained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. Right and left two snowbrushes 18 and 19 are pivotally supported by concentric shafts inside a snowbrush support frame 20 disposed at the rear of the snowplow A. The outer ends of the concentric shafts Left and right hydraulic motors 3,
4 are continuously provided, and the left and right snow brushes 18, 1 are provided.
9 are rotated.

A mechanism for raising and lowering the left and right snow brushes 18 and 19 includes a fixing bracket 24 fixed to both sides of a rear frame 25 of the snow removal vehicle A by bolts.
It is rotatably connected to the support frame lifting bracket 21 of the snowbrush by four links 22 connected by pins 23. The support frame lifting bracket 21 is raised and lowered because the bottom clevis is rotatably connected to the pin 26 connecting the bracket 28 fixed to the upper left and right of the rear frame by bolts. The attached hydraulic cylinders 9 and 10 are suspended,
The lower ends thereof are rotatably connected to the attached hydraulic cylinder connecting bracket 21A by pins 27, respectively, and the snow brush can be moved up and down by the left and right attached hydraulic cylinders 9, 1.
It is configured to be performed by the expansion and contraction operation of 0.

By this mechanism, the left and right snow brushes 1
8 and 19 in contact with the road surface
A snowbrush automatic control system is adopted to detect the grounding load of 19 and keep the rotational force of the left and right hydraulic motors 3 and 4 always at a set value. The details are described below based on a hydraulic circuit diagram. explain.

The hydraulic oil generated by the hydraulic pumps 1 and 2 is transmitted to the left and right hydraulic motors 3 and 4 to rotate the left and right snow brushes 18 and 19, respectively. The inlet and outlet lines of 4 are provided with pressure sensors 11, 13, 12, and 14, respectively, and detect the pressure difference between the inlet and outlet of the hydraulic oil of the left and right hydraulic motors 3, 4. The hydraulic oil generated by the hydraulic pumps 5, 6 is used to extend and retract the left and right snow brushes 18, 19 by controlling the right and left attached hydraulic cylinders 9, 10 under the control of hydraulic proportional directional control valves 7, 8. is there. Further, the left and right attached hydraulic cylinders 9 and 10 are respectively attached with linear displacement sensors 15 and 16 for elevating and lowering to detect the expansion and contraction positions of the left and right attached hydraulic cylinders 9 and 10.

In order to make the working state, the left and right snow brushes 18 and 19 are rotated to rotate the left and right attached hydraulic cylinders 9 and 10 disposed on the left and right of the rear frame 25.
The left and right snow brushes 18 and 19 are lowered by the extension, and in the process, the input signals are detected by detecting the positions of the linear displacement sensors 15 and 16 for ascending and descending attached to the left and right attached hydraulic cylinders 9 and 10. Automatic control device 1
The reception signal is calculated by the control unit 7 and the output signal is appropriately actuated to the left and right attached hydraulic cylinders 9 and 10 via the hydraulic proportional directional control valves 7 and 8, so that the landing cylinders descend in a well-balanced manner.

In the snow removing operation, the fluctuation of the rotational force caused by the difference in the grounding force between the left and right snow brushes 18 and 19 is determined by the pressure difference between the inlet and the outlet of each of the left and right hydraulic motors 3 and 4. , 13 and the right pressure sensor 12, 14
The input signal is detected and calculated by the automatic control device 17, and the output signal is output via the hydraulic proportional directional control valves 7, 8 for the linear displacement for raising and lowering the left and right snow brushes. The attached hydraulic cylinders 9 and 10 of the sensors 15 and 16 are moved up and down as appropriate to maintain the set value of the ground force of the snow brush. If the right snow brush 19 is too strong in contact with the road surface, the pressure difference between the inlet and the outlet is detected by the right pressure sensors 12 and 14 provided in the inlet and outlet lines of the right hydraulic motor 4. Is measured, and when the set value is exceeded due to the pressure difference between the inlet and the outlet of the left hydraulic motor 3, the right attached hydraulic cylinder 10 is shortened by the output signal of the automatic control device 17, and the right snow brush 19 is The set value is appropriately raised to maintain the set value, and when the set value is smaller than the set value, the right attached hydraulic cylinder 10 is extended and lowered appropriately so as to maintain the set value, and the set value is always maintained.

Hereinafter, the same control is performed in the operation of the left snow brush 18. The countermeasures against the pressure loss caused by the change in the viscosity of the hydraulic oil are as follows: the left pressure sensors 11 and 13 and the right pressure sensor 12 provided in the inlet and outlet lines of the left and right hydraulic motors 3 and 4. , 14, the automatic control device 17 receives and calculates the differential pressure signal between the inlet and the outlet, and outputs the output signal via the right and left hydraulic proportional directional control valves 7, 8 to the left and right attached hydraulic pressures for raising and lowering the snow brush. The cylinders 9 and 10 are appropriately raised and lowered to maintain the set values of the ground force of the left and right snow brushes 18 and 19. Further, when lowering the left and right snow brushes 18 and 19 from the retracted position to the working position in order to improve the efficiency during snow removal, the left and right attached hydraulic cylinders 9 and 19 are required.
By the extension operation of 10, the right and left snow brushes 18 and 19 descend at a high speed from the start of rotation down to the touchdown. After that, the set value is changed at a low speed, but the position at which the speed is changed from the high speed to the low speed is determined by the contact resistance when the left and right snow brushes 18 and 19 come into contact with the road surface, that is, the rotational force of the left and right hydraulic motors 3 and 4 Pressure sensors 11 and 13 and right pressure sensor 1
The automatic control device 17 receives and calculates the input signal, and receives the signal via the hydraulic proportional directional control valves 7 and 8 to attach the left and right elevating linear displacement sensors 15 and 16 to the attached hydraulic cylinders. 9 and 10 are appropriately operated at a low speed. In the process of wearing the left and right snow brushes 18 and 19, the switching of the descending speed is similarly controlled.

[0013]

Since the present invention is configured as described above, the following effects can be obtained. 1. The ground force of the left and right snow brushes 18, 19 can always be maintained at a set value without being affected by the wear of the brushes. 2. Detects and calculates the rotational force difference between the left and right hydraulic motors 3 and 4,
The right and left attached hydraulic cylinders 9 and 10 are raised and lowered appropriately,
It is possible to maintain the uniformity of the ground contact area of the left and right snow brushes 18 and 19. 3. Since the descending speeds of the left and right snow brushes 18 and 19 are of a high / low conversion type without being affected by the wear of the brushes, efficient work is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automatic snowbrush control device.

FIG. 2 is a hydraulic circuit diagram of the automatic snowbrush control device.

FIG. 3 is an enlarged view of a main part of a left side surface of a storage posture of the snowbrush.

FIG. 4 is an enlarged view of a main part on the left side of a working posture of the snowbrush.

FIG. 5 is a left side view of the snowplow having the automatic snowbrush control device.

[Explanation of symbols]

 A Snowplow 1,2,5,6 Hydraulic pump 3,4 Hydraulic motor 7,8 Hydraulic proportional directional control valve 9,10 Attached hydraulic cylinder 11,12,13,14 Pressure sensor 15,16 Linear displacement sensor for vertical movement 17 Automatic control device 18, 19 Snowbrush 20 Snowbrush support frame 21 Support frame lifting bracket 21A Hydraulic cylinder coupling bracket 22 Link 23, 26, 27 Pin 24 Fixed bracket 25 Rear frame 28 Bracket

Claims (3)

[Claims] In a snow removal operation using a snow brush,
In order to always maintain the set conditions for the ground force of the left and right snow brushes (18, 19), the left and right snow brushes (18, 19)
Left and right hydraulic motors (3, 4) giving rotation to 19)
The rotational force of the hydraulic motor (3, 4) is compared with the pressure difference between the inlet and outlet of the pressure oil by the left and right pressure sensors (11, 12, 13, 1).
4) The signal is input to the automatic control device (17), and the amount of change in the rotational force of the left and right hydraulic motors (3, 4) is calculated. If the number is smaller, the attached hydraulic cylinders (9, 10) of the linear displacement sensors for elevation (15, 16) disposed on the left and right snow brushes are appropriately lowered to correct the pressure. And an automatic controller (17) for raising and lowering the attached hydraulic cylinders (9, 10) when the rotational force of the hydraulic motors (3, 4) exceeds a set value. Automatic snowbrush controller. 2. The vertical movement amount of an attached hydraulic cylinder (9, 10) of a linear displacement sensor (15, 16) for raising and lowering disposed on the left and right of a support frame (20) of a snowbrush is determined. Then, the rotational force difference between the left and right hydraulic motors (3, 4) rotating the left and right snow brushes (18, 19) is detected and calculated, and the right and left snow brushes (18, 19) are moved up and down as appropriate.
The automatic snowbrush control device according to claim 1, wherein the uniformity of the contact width with the road surface of the above 19) can be maintained. 3. The descent time required for the left and right snow brushes (18, 19) to reach the road surface from the storage position is as follows.
The snow brushes (18, 19) rotate and start descending, descend at a high speed until the touchdown, and thereafter are automatically converted to a low speed to maintain the set condition. The brushes (18, 19) wear as they are used, but in the course of wear, the attached hydraulic cylinders of the linear displacement sensors (15, 16) for raising and lowering disposed on the left and right sides of the snow brush for raising and lowering. (9,
The falling time of (10) is configured such that the snowbrush descends at a high speed until it touches the ground, as in the case of a new article, and thereafter is automatically converted to a low speed to maintain the set condition. An automatic snowbrush control device as described in the above.