JPH018470Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a warning device for a working vehicle such as a tractor that issues an alarm when the traveling body of the vehicle is tilted beyond a dangerous angle.

Conventionally, work vehicles such as tractors have a working machine such as a rotary attached to the rear of the running body.
During the work, the machine is controlled to keep it horizontal regardless of the inclination of the machine, and during non-work such as general driving, the machine is raised to release the above control state and the machine is kept parallel to the machine. I try to drive while maintaining it. During normal driving, an alarm device is activated to notify the operator of the condition if the traveling aircraft is tilted by a predetermined angle or more in order to prevent the traveling aircraft from falling over. However, in the above-mentioned conventional warning device, an independent sensor was provided on the traveling aircraft side to detect the inclination of the traveling aircraft.
The disadvantage is that the device is expensive.

Therefore, the present invention utilizes an inclination sensor for horizontal control of a working machine as a sensor for detecting inclination of a traveling body to warn of an abnormal inclination of a traveling body during normal driving of a working vehicle, thereby achieving the above-mentioned results. It is an object of the present invention to provide an abnormal inclination warning device for a work vehicle that eliminates the above drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a working vehicle 1 such as a tractor has a running body 3 supported by wheels 2, and a working machine 6 such as a rotary is attached to the rear of the traveling body 3 by a link device 5. It is installed. As shown in FIG. 2, the link device 5 consists of left and right lower links 7, 7 and a top link 9. Furthermore, the left and right lower links 7, 7 are lifts that are rotated by hydraulic cylinders built into the traveling body 3. Lift rods 11a and 11 are attached to arms 10 and 10, respectively.
They are connected via b. Further, the work machine 6 is equipped with a tilt sensor S that detects the tilt of the work machine 6 with respect to the horizontal plane, and one of the lift rods 11a is configured to detect the tilt angle of the work machine 6 according to the output of the tilt sensor S during work. It is composed of a hydraulic cylinder device 12 that adjusts. Furthermore, near the cockpit 13 in the upper center of the aircraft 3, the above-mentioned tilt sensor S is installed.
control box 15 for the ground horizontal control device according to the present invention and the abnormal tilt warning device according to the present invention, and alarm means 1 such as an alarm buzzer or an alarm lamp.
6 are arranged respectively.

The alarm device 17 according to the present invention, as shown in the block diagram in FIG. has a circuit configuration as shown in FIG. 4, for example. In addition, in FIG. 4, the part indicated by the reference numeral 20a is a low-voltage side reference voltage generation section that outputs the low voltage reference voltage Vι, and the one indicated by the numeral 20b is a high-voltage side reference voltage generation section which outputs the high-voltage reference voltage Vι. Voltage Vh
Output.

FIG. 5 shows the traveling aircraft 3 in the inclination detection section 19.
That is, it is a diagram showing the relationship between the angle θ of the tilt sensor S and its output voltage V. When the tilt sensor angle θ is 0 degrees, that is, the traveling body 3 is horizontal, the sensor output voltage is
Becomes Vm. Then, when the traveling body 3 tilts to the left and the traveling body 3 does not fall over but tilts at a dangerous angle θ'ι which is not safe, the sensor output voltage becomes Vl, and the low voltage side reference voltage in Fig. 4 The output reference voltage from the generator 20a is set equal to this voltage. When the body 3 further tilts and the inclination angle θ reaches θl, the body 3 falls over, and the output voltage at this time becomes Vθl. At the same time, when the traveling body 3 leans to the right and reaches the critical angle θ'r, the sensor output voltage becomes Vh, which becomes equal to the output voltage from the high voltage side reference voltage generating section 20b as shown in FIG. Then, the aircraft 3 further tilts to the right, and when the inclination angle θ reaches θr, the aircraft 3 falls to the right, and the sensor output voltage at this time becomes Vθr.

Since the present embodiment has the above-described configuration, when the rotary work machine 6 is in a working state in which it is lowered, the tilt state of the work machine 6 is detected by the tilt sensor S, and based on the signal from the sensor S, it is The hydraulic cylinder device 12 is expanded and contracted by the control device, and the working machine 6 is automatically controlled to be in a horizontal state regardless of the inclination of the traveling body 3. Then, when the work is finished and the traveling machine 3 is caused to travel normally, when the work machine 6 is raised, the work machine 6 is moved to a position where the hydraulic cylinder device 12 is at a predetermined position, that is, the left and right lift rods 11a and 11b are at the same length. is fixed to and held in a horizontal state with respect to the traveling machine body 3, and in this case, in conjunction with an appropriate means, such as a lifting operation means of the working machine 6 or a switch activated by the lifting of the working machine 6, The ground horizontal control device is released from the control state, and the inclination sensor S is switched to the alarm device 17 side according to the present invention, forming an alarm circuit as shown in FIG. 4. When the machine body 3 is run in such a state, the machine body 3 tilts from side to side along the slope of the crease etc. while the machine body 3 is running, or when the work machine 6 is raised and turned during work, the machine body 3 tilts. When the inclination angle θ is in the range of 0≦θ≦θ′l or 0≦θ≦θ′r, the sensor output voltage V from the inclination detection section 19 becomes Vl≦Vm≦Vh, and the low voltage side reference voltage Since it is higher than the low voltage reference voltage Vl from the generation section 20a and lower than the high voltage reference voltage Vh from the high voltage side reference voltage generation section 20b, the signal comparison section 21
Therefore, as shown in FIG.
is not played and no alarm is issued. Then, for example, if the traveling aircraft 3 tilts significantly to the left, θ>
When θ′l, the sensor output voltage V becomes V<Vl,
Since the voltage is lower than the low voltage reference voltage Vl, an output is output from the signal comparison section 21 and the sixth signal is sent to the alarm buzzer drive section 22.
As shown in the figure, the drive current I flows and the alarm buzzer 1
An alarm is issued from 6 onwards. Similarly, when the traveling aircraft 3 tilts significantly to the right and θ>θ′r, V>Vh
Therefore, the drive current I similarly flows to the alarm buzzer drive unit 22, and the alarm buzzer 16 is driven.

As explained above, according to the present invention, when the work implement 6 attached to the rear of the traveling machine body 3 is in the horizontally raised position, the inclination sensor S for ground level control provided on the work implement 6 is detected to detect an abnormality of the work vehicle 1. Since the tilt alarm device 17 side is configured to detect the inclination of the traveling aircraft 3 during general driving using the same inclination sensor S, there is no need to provide an independent tilt sensor on the traveling aircraft 3 side, and the device The configuration itself becomes simpler and the manufacturing cost of the device can be reduced.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing a working vehicle to which the present invention is applied, Fig. 2 is a perspective view showing the supporting portion of the working machine, and Fig. 3 is a block diagram showing the configuration of the abnormal tilting device according to the present invention. Figure 4 is a circuit diagram showing an example of a specific electric circuit, Figure 5 is a diagram showing the tilt angle versus output voltage characteristic of the tilt sensor, and Figure 6 is a diagram showing the output voltage versus alarm drive current characteristic of the tilt sensor. FIG. 1...Work vehicle, 3...Traveling body, 6...Work machine, 16...Alarm means (warning buzzer), 17...
Abnormal tilt warning device, S... tilt sensor.

Claims (1)

[Scope of utility model registration request] A working machine 6 is attached to the rear of the traveling machine 3, and during work, the working machine 6 is kept in a horizontal state regardless of the inclination of the traveling machine 3 based on the detection action of a tilt sensor S disposed on the working machine 6. In the work vehicle 1, the work implement 6 is controlled to be raised and held parallel to the traveling body 3 during general running of the work vehicle 1, and a rise detection means for detecting the raised position of the work implement 6 is provided. Further, an alarm device 17 is provided which compares the signal from the inclination sensor S with a reference signal and activates the alarm means 16 when an abnormal inclination of the traveling body 3 is detected, and the raised position of the ascent detection means is An abnormal inclination warning device for a work vehicle, characterized in that a switching means is provided for switching the inclination sensor S to activate the warning device 17 based on detection.