JP3999095B2 - Remaining amount detection device in fluid supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remaining amount detection device for detecting a remaining amount of a fluid stored in a hopper in a fluid supply device.
[0002]
[Prior art]
Conventionally, as a remaining amount detection device in a fluid supply device, for example, as disclosed in Patent Document 1, after setting the amount of an antifreezing agent accommodated in a hopper of a spray vehicle, the spray vehicle is in operation. The amount of spraying is calculated from the speed of the conveyor carrying the antifreezing agent from the hopper, the opening degree of the gate disposed on the conveying end of the conveyor, and the gate width and the specific gravity of the antifreezing agent. The remaining amount of the antifreezing agent in the hopper is calculated and displayed from the amount of the antifreezing agent charged into the hopper.
[0003]
[Patent Document 1]
Japanese Examined Patent Publication No. 7-84728 [0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional one, a detection device for detecting the gate opening and the speed of the conveyor must be provided, and the structure of the entire device becomes complicated. In addition, it is necessary to set the gate width and the like in advance, and in the control device, the control is complicated because the calculation is performed based on the set value set in advance and the detection signal from each of the detection devices. There was a high risk of it being raised, and there was a problem of applying reliability.
[0005]
The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a remaining amount in a highly reliable fluid supply apparatus with a simple configuration and capable of reliably detecting the remaining amount of the fluid. It is to provide a detection device.
[0006]
[Means for Solving the Problems]
The remaining amount detection device in the fluid supply device of the invention according to claim 1 is the fluid supply device that supplies the fluid stored in the hopper to the outside through the discharge device while stirring the fluid by the stirring device as necessary. The agitation device is configured to agitate the fluid by rotating the agitation member by a rotational drive of a hydraulic motor driven by the supply of pressure oil from a hydraulic pump of the hydraulic circuit , while the hydraulic circuit includes A pressure detector for detecting the pressure of the pressure oil is provided, and the remaining amount of the fluid is detected based on the pressure detection result by the pressure detector.
[0007]
According to a second aspect of the present invention, the pressure detector includes at least one pressure switch, and the pressure switch reduces the pressure oil to a predetermined pressure or less. When the detection is made, the shortage of the remaining amount of the fluid is notified by the notification means.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a supply device that supplies a spray agent for preventing freezing will be described as an example of the fluid supply device.
[0009]
FIG. 1 shows the overall configuration of the supply apparatus.
[0010]
The supply device 1 is mounted on the vehicle C, for example, for spreading a spray for preventing freezing on the road.
[0011]
Specifically, the supply device 1 includes a hopper 2 that stores the spraying agent, and a spraying means 3 as a discharge device provided at the bottom of the hopper 2.
[0012]
The upper surface of the hopper 2 is opened, and a spraying agent is charged and stored through the upper surface opening 2a. The upper surface opening 2 a is covered with a cover material 21 that can be freely opened and closed so as to prevent rain and snow from entering the hopper 2.
[0013]
The spraying means 3 includes a conveying screw 31 provided at the bottom of the hopper 2, a chute 32 connected to the rear carry-out end of the conveying screw, and a turntable 33 provided at the lower end of the chute 32.
[0014]
The conveying screw 31 conveys the spraying agent guided to the bottom of the hopper 2 by the rotational drive of a hydraulic motor (not shown) to the rear of the vehicle and throws it into the chute 32.
[0015]
The chute 32 is for guiding the spray agent from the carrying-out end of the conveying screw 31 to the rotating plate 33 disposed at a predetermined height on the road, and is suspended in a state inclined slightly rearward from the carrying-out end of the conveying means 31. It is installed.
[0016]
The turntable 33 is configured to be rotatable about a vertical axis by a driving device (not shown). On the turntable 33, along with the spraying agent supplied from the conveying screw 31 through the chute 32, the side portion of the hopper 2. The solution is supplied from a solution tank (not shown) provided in the container.
[0017]
Accordingly, while the vehicle C is traveling at a predetermined speed, the spraying agent in the hopper 2 is supplied onto the rotating plate 33 through the chute 32 by the conveying screw 31 and the solution is supplied onto the rotating plate 33, whereby the spraying agent is supplied. And the solution can be uniformly sprayed on the road while mixing, thereby preventing the road surface from freezing.
[0018]
Incidentally, a stirring device 4 is provided in the hopper 2. The stirring device 4 is disposed horizontally above the conveying screw 31 in a state parallel to the conveying screw 31. Specifically, as shown in FIG. 2, the stirring device 4 is provided in the hopper 2 constituting the stirring member so as to be rotatable and horizontally supported by the stirring shaft 41, and radially provided on the stirring shaft 41. The plurality of stirring blades 42 and a hydraulic motor 43 provided at one end of the stirring shaft 41 are configured.
[0019]
In the hydraulic motor 43, a drive shaft connected to the stirring shaft 41 is rotatable in forward and reverse directions by supplying pressure oil from a hydraulic pump provided in a hydraulic circuit described later.
[0020]
Therefore, the spraying agent stored above the conveying screw 31 is agitated by rotating the agitation shaft 41 and the agitation blade 42 by the rotation of the hydraulic motor 43 described above. As a result, the spraying agent bridging phenomenon occurring in the hopper 2 is eliminated, and the spraying agent is smoothly guided to the conveying screw 31 so that the feeding agent 31 can be supplied smoothly and stably. ing.
[0021]
FIG. 3 shows a hydraulic circuit for rotating the hydraulic motor 43 described above.
[0022]
In FIG. 3, P is a hydraulic pump. The suction side of the hydraulic pump P communicates with the oil tank T, and the discharge side communicates with the hydraulic motor 43 via the switching valve 45 via the supply path 44. .
[0023]
The switching valve 45 is a three-position switching type electromagnetic valve that returns the pressure oil from the hydraulic pump P to the oil tank T at the neutral position shown in FIG. 3, and the pressure oil from the hydraulic pump P at the right position in FIG. The hydraulic motor 43 is supplied to rotate the hydraulic motor 43 in one direction (forward rotation), and the hydraulic oil from the hydraulic pump P is supplied to the hydraulic motor 43 at the left position in FIG. It is made to rotate in the direction (reverse rotation).
[0024]
The switching valve 45 is moved to each position described above by exciting and demagnetizing a solenoid provided in the switching valve 45 based on an operation signal input to the control device 5 by the control device 5 shown in FIG. Switched.
[0025]
In the hydraulic circuit configured as described above, a pressure switch 6 is provided in a supply path 44 between the hydraulic pump P and the switching valve 45.
[0026]
The pressure switch 6 is set to be switched from ON to OFF when the pressure of the pressure oil in the supply path 44 becomes a predetermined pressure or less.
[0027]
An OFF signal resulting from the switching of the pressure switch 6 is output as a detection signal to the control device 5 shown in FIG. 4, and the control device 5 performs the following control.
[0028]
In addition to the detection signal from the pressure switch 6 described above, an operation signal from a spraying work switch (not shown) is input to the control device 5.
[0029]
The control device 5 drives the hydraulic pump P based on this operation signal and outputs an operation signal to the switching valve 45. As a result, the switching valve 45 is switched from the neutral position to the right position or the left position, and the stirring device 4 is operated and the conveying screw 31 of the spraying means 3 is driven to spray the spraying agent and the like on the road as described above. .
[0030]
By spreading the spraying agent from the hopper 2 in this way, if the spraying agent in the hopper 2 decreases, the load due to the stirring of the spraying agent on the stirring device 4 gradually decreases. Along with this, the pressure of the pressure oil in the supply passage 44 also gradually decreases. When the pressure falls below a predetermined pressure, the pressure switch 6 is turned off, and this signal is input to the control device 5. The Based on this signal, the control device 5 outputs an operation signal to, for example, the display lamp 51 serving as a notification means, and turns on or blinks the display lamp 51.
[0031]
That is, when the spraying agent is reduced to a certain level in the hopper 2, the remaining amount of the spraying agent is detected by detecting the pressure of the pressure oil that decreases with this, and the operator is notified through the display lamp 51. I am trying to inform you. Therefore, when the pressure change of the pressure oil accompanying the decrease of the spraying agent is grasped in advance and the timing at which the pressure switch 6 is switched based on this is adjusted, the spraying agent reaches the desired remaining amount. Can be set to detect this.
[0032]
In addition, the stirring apparatus 4 may be operated continuously with the spraying operation, or may be operated intermittently in a certain unit of time.
[0033]
In addition, as shown in FIG. 4, an operation signal from the stirring operation switch SW is input to the control device 5. Then, the control device 5 switches the switching valve 45 on the basis of an operation signal from the stirring operation switch SW and causes the stirring device 4 to perform the stirring operation for a predetermined time. Thereby, even when the spraying operation is not performed, the stirring device 4 can be operated to check the remaining amount of the spraying agent in the hopper 2 described above.
[0034]
As described above, the remaining amount of the spraying agent is detected based on the pressure of the pressure oil in the supply path 44 of the hydraulic circuit that contributes to the driving of the hydraulic motor 43 of the agitating device 4, so that it is simple only by detection by the pressure switch 6. The remaining amount can be reliably detected by the device structure.
[0035]
In the present embodiment, the remaining amount is detected by one pressure switch 6, but by providing a plurality of pressure switches 6 and switching each pressure switch stepwise as the spraying agent decreases, The remaining amount of spraying agent can also be displayed in stages.
[0036]
It is also possible to measure a change in the pressure value with a pressure sensor and display the remaining amount of spraying agent converted into a weight value by the control device 5 based on the pressure value.
[0037]
Further, the notification means may be any means that can notify the operator, such as a buzzer, in addition to the display lamp.
[0038]
Further, the above-described remaining amount detection device can be applied as long as the fluid supply device supplies not only a granular material such as a spraying agent but also a fluid such as powder or liquid.
[0039]
【The invention's effect】
As described above, according to the remaining amount detection device in the fluid supply device of the present invention, the fluid is supplied by rotating the stirring member by the rotational drive of the hydraulic motor driven by the supply of the pressure oil from the hydraulic pump of the hydraulic circuit. A simple device configured to agitate and to provide a pressure detector for detecting the pressure of pressure oil in the hydraulic circuit , and detecting the remaining amount of fluid based on the pressure detection result by the pressure detector. According to the structure, the remaining amount can be reliably detected, and a highly reliable remaining amount detecting device can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a supply device mounted on a vehicle.
FIG. 2 is a side view showing a stirring device provided in the hopper.
FIG. 3 is a hydraulic circuit diagram of a stirring device including a remaining amount detection device.
FIG. 4 is a block diagram showing a control system of a stirring device that is similarly provided with a remaining amount detection device.
[Explanation of symbols]
1 Supply device (fluid supply device)
2 Hopper 3 Spraying means (discharge device)
4 Stirring device 43 Hydraulic motor 5 Control device 6 Pressure switch (pressure detector)
P Hydraulic pump

Claims (2)

In the fluid supply device that supplies the fluid stored in the hopper to the outside through the discharge device while stirring by the stirring device as necessary,
The agitation device is configured to agitate the fluid by rotating the agitation member by a rotational drive of a hydraulic motor driven by the supply of pressure oil from a hydraulic pump of the hydraulic circuit , while the hydraulic circuit includes A remaining amount detection device in a fluid supply apparatus, wherein a pressure detector for detecting the pressure of the pressure oil is provided, and the remaining amount of the fluid is detected based on a pressure detection result by the pressure detector. The pressure detector includes at least one pressure switch, and when the pressure switch detects that the pressure oil has become equal to or lower than a predetermined pressure, the notification means notifies the fluid remaining shortage. The remaining amount detection apparatus in the fluid supply apparatus according to claim 1, wherein:

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