JPS6322807Y2 - - Google Patents

Description

[Detailed explanation of the invention] In general, when working with agricultural tractors and other working machines, the wheels on one side of the machine are carried up on raised parts such as ridges, or when working on slopes in the mountains. There are cases where work is carried out with the traveling machine tilted left and right.At this time, if the traveling machine is tilted beyond a certain level and traveling at high speed, the machine may become unstable, especially in fields with severe ups and downs or fields with many stones. There is a risk of falling.

In view of the above-mentioned circumstances, it is an object of the present invention to make it possible to safely perform work with the traveling machine body tilted in the left-right direction.

First, an embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, a rotary tiller 5 as a working device is connected to the rear of an agricultural tractor 1 as a traveling machine via a three-point link mechanism 4 consisting of a top link 2 and a pair of left and right lower links 3, 3. A pair of left and right lift arms 7, 7, which are connected and moved up and down by a single-acting hydraulic cylinder 6 installed at the rear of the tractor 1, are connected to the lower links 3, 3 via lift rods 8a, 8b. Thus, a riding type tiller is constructed in which the rotary tiller 5 is raised by hydraulic pressure and lowered by its own weight.

Of the lift rods 8a and 8b, the left one 8a is constituted by a rod with a turnbuckle interposed therebetween, and the right one 8b is configured to be able to change and adjust the left and right tilted posture of the rotary cultivating device 5 by extending and contracting the lift rods 8a and 8b. It is composed of a double-acting hydraulic cylinder 9.

FIG. 3 shows a hydraulic circuit for the two hydraulic cylinders 6, 9, in which control valves 10, 11 for the two hydraulic cylinders 6, 9 are connected to a hydraulic pump P driven by an engine E mounted on the tractor via a diversion valve 12. It's connected. The control valve 10 of the lift arm hydraulic cylinder 6 is provided with an operating lever 13 that can be held at any operating position, and the operating lever 13 and the lift arm 7 are connected via a feedback link mechanism 14. The lift arm 7 is linked and connected to a height corresponding to the operating position of the operating lever 13.
When the robot moves up and down, the control valve 10 is automatically returned to neutral and stops moving up and down. In other words, the lift arm 7 is configured to be position controlled.

Further, the control valve 11 for the lift rod hydraulic cylinder 9 is of an electromagnetically actuated type.
The automatic rolling system connects solenoids 11a and 11b for 1 and a left/right tilt sensor 15 provided in the tilling device 5 via a control circuit 16, and constantly maintains the tilling device 5 in a horizontal posture based on the detection result of the sensor 15. It is configured to perform control.

The inclination sensor 15 is configured to detect the left and right inclination of the float 15c floating on the liquid surface by a set angle or more using a pair of left and right reed switches 15a and 15b. , the switch 15b is designed to close when the switch 15b moves downward to the left.

Therefore, when the rotary tiller 5 is in a substantially horizontal position, both the switches 15a and 15b are open, and the control valve 11 is maintained neutrally.

When the rotary tiller 5 tilts downward to the right beyond a certain level, the right switch 15a closes, and the ascending solenoid 11a is energized and excited.
The hydraulic cylinder 9 is driven to contract until the right switch 15a is opened, that is, until the tilling device 5 returns to the horizontal position. Conversely, if the tilling device 5 tilts downward to the left beyond a certain level, the left switch 1
5b is closed, the descending solenoid 11b is energized and excited, the hydraulic cylinder 9 is driven to extend, and the tilling device 5 is controlled to roll in a horizontal position.

The vehicle speed is determined by the device 17 that detects when the tractor 1 is tilted more than a certain level in the left-right direction with respect to the horizontal plane by the inclination angle of the tilling device 5 to the machine body, and by the rotation speed of the axle 18 of the tractor 1. A device 19 for detecting an increase above a certain level is provided, as well as an alarm mechanism (an example of a safety mechanism) 20 that is activated when both of these detection devices 17 and 19 are activated.

The inclination detection device 17 is connected to the hydraulic cylinder 9.
An operating member 22 that moves in and out of the cylindrical member 21 extending from the bottom side of the cylinder 9 as the cylinder expands and contracts is connected to the piston rod 9A side of the cylinder 9. When 9 is contracted beyond a certain level from the neutral equivalent position,
That is, when the tractor 1 descends to the right beyond a certain level, a normally open switch 24a is installed, which is closed by contact with the tongue piece 23 fixed to the lower end of the cylindrical member 21. Said cylindrical member 21
When the cylinder 9 is extended beyond a certain level from the neutral equivalent position, that is, when the tractor 1 is tilted downward to the left beyond a certain level, the cylinder 9 is closed by releasing contact with the operating member 22. It is constructed by installing a normally closed switch 24b.

The alarm mechanism 20 is a buzzer, and its power circuit is connected to a switch 19a of the vehicle speed detection device 19.
and switches 24a, 2 of the inclination detection device 17
4b is interposed.

Incidentally, a buzzer and an indicator lamp may be used together as the alarm mechanism 20.

Further, in the above-mentioned embodiment, an alarm mechanism is used as the safety mechanism 20, but instead of this, an automatic engine stop mechanism or a mechanism that automatically decelerates the vehicle speed to a set speed or less may be used. Alternatively, these may be implemented in appropriate combinations.

Further, in the above-described embodiment, the horizontal inclination of the tractor 1 is detected using the inclination angle of the tilling device 5 relative to the machine body. It is also possible to directly detect the left and right inclinations of.

Furthermore, even when the vehicle speed is low, the safety mechanism 20 is activated when the relationship between the vehicle speed and the inclination angle of the tractor 1 becomes a condition that will cause the machine to overturn, such as when the left-right inclination angle of the tractor 1 becomes large. You may configure it as much as possible.

In summary, the safety device for a work machine according to the present invention includes a device 17 that detects when the running structure body 1 is tilted to the left or right beyond a certain level with respect to a horizontal plane, and a device 19 that detects that the vehicle speed increases beyond a certain level. and a safety mechanism 20 that is activated when both of these detection devices 17 and 19 are activated, so that the traveling body 1 can be tilted in the left-right direction. During work, the safety mechanism 20, which is activated when the horizontal tilt of the aircraft and the vehicle speed become conditions that induce the aircraft to overturn, for example, alerts the operator with an alarm device, or automatically shuts down the engine. Stopping the running itself using a stopping mechanism, or
By reducing the vehicle speed to a safe running speed using the vehicle speed reduction mechanism, it is possible to indirectly or directly return the vehicle from a dangerous running state to a safe running state quickly and accurately. The work has always been carried out safely.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the safety device for a working machine according to the present invention, in which Fig. 1 is an overall side view of a riding type cultivator, Fig. 2 is a perspective view of a connecting part of the tiller, and Fig. 3 is a hydraulic circuit. Figure 4 is a partially cutaway view of the wheel support part.
FIG. 5 is an electrical circuit diagram of the main part. DESCRIPTION OF SYMBOLS 1... Traveling body, 5... Working device, 17... Inclination detection device, 19... Vehicle speed detection device, 20... Safety mechanism.

Claims (1)

[Claims for Utility Model Registration] A device 17 for detecting that the traveling aircraft 1 is tilted to the left or right above a certain level with respect to a horizontal plane, and a device 19 for detecting that the vehicle speed has increased above a certain level.
In addition, both of these detection devices 17,
1. A safety device for a work machine, characterized in that a safety mechanism 20 is provided which is activated when both of the detection elements 19 and 19 are activated. A safety device for a working machine according to claim 1, wherein the safety mechanism 20 is an alarm mechanism. A safety device for a working machine according to claim 1, wherein the safety mechanism 20 is an automatic engine stop mechanism. The inclination detection device 17 detects the inclination angle of the working device 5 that is controlled to roll in a horizontal position with respect to the traveling machine body 1 with respect to the machine body. safety equipment for work equipment.