JPS637704A - Working machine raising and lowering apparatus of tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention provides a device for lifting and lowering a working implement attached to the rear of an agricultural tractor, which enables the lifting and lowering of the working implement to be forcibly driven, and always maintains a set depth. The present invention relates to a configuration for controlling.

(B) Prior art Conventionally, working machines such as rotary tillers have been lifted and lowered using single-acting hydraulic cylinders.When going up, oil is sent to the hydraulic cylinder to extend the work equipment, and when going down, the oil supply is stopped to raise and lower the work equipment. It was being lowered by its own weight. In addition, tillage depth control to maintain a constant tillage depth is achieved by electrically or mechanically feeding back the rotation angle of the tiller cover attached to the rear end of the rotary tiller to raise it when the tillage depth becomes deeper and raise it when it becomes shallower. The plowing depth was maintained at a constant depth by lowering the plowing depth.

(c) Problems to be solved by the invention However, in the above-mentioned configuration, when cutting in the orthogonal direction of ridges or tilling work on headlands, there are many unevenness and the plowing plate often changes in hardness and softness. As shown in the figure, the plowing depth is not constant. In other words, with the method of lowering the rotary tiller using its weight, the lowering may be delayed depending on changes in unevenness, or the tiller may be hard and not penetrate into the tiller well, resulting in problems in deep tillage areas (al and shallow tillage areas). bl had occurred.

(d) Means for solving the problem In view of the above points, the present invention is constructed as follows.

A sensor (16) is provided at the rotation base of the lift arm (11) in the work equipment lifting device, and the hydraulic cylinder that rotates the lift arm (11) is replaced by a double-acting hydraulic cylinder (
10), and a sensor (15) for detecting inclination in the longitudinal direction is provided near the rear wheel axle (5a), and the control valve (21) is switched based on the signals from the sensor (15) and (16) to operate the work machine. Lift arm (1) to maintain constant temperature
1) is forcibly driven.

(E) Embodiments The objects of the present invention are as described above, and the present invention will be explained in detail based on the configuration of the embodiments shown in the accompanying drawings.

FIG. 1 is a side view of an agricultural tractor equipped with the lifting device of the present invention. Figure 2 is a side view of an agricultural tractor when working in a field with uneven surfaces. FIG. 3 is a hydraulic circuit diagram and a block diagram of electrical control.

In the agricultural tractor (T) shown in FIGS. 1 and 2, (3) is a seat, (4) is a front wheel, and (5) is a rear wheel.

A lower link (6) is pivotally connected to the lower rear part of the mission case (1) at the bottom of the seat (3), and a top link (7) is pivotally connected to the rear surface via a top link hinge (8).
A rotary tiller (R) is attached to the rear end of the top link (7) as a working machine. At the top of the mission case (1) are a hydraulic cylinder (10) and a lift arm (11).
), and an arm (12) is fixed to the rotation axis of the lift arm (11), and a piston rod of a hydraulic cylinder (10) is pivotally supported at the end of the arm (12). Further, a lift link (9) is pivotally supported at the tip of the lift arm (11), and the other end of the lift link (9) is pivotally supported in the middle of the lower link (6). Therefore, lift arm (11)
By rotating the d-tally tiller (R), the d-tally tilling device (R) is raised and lowered.

The hydraulic cylinder (10) is a double-acting type, and even if the hydraulic cylinder (10) is pivoted as shown in Fig. 1, the hydraulic cylinder (10) is fixed as shown in Fig. 3, and the arm (12)
An elongated hole (12a) may be formed in the elongated hole (12a), and the piston rod may be pivotally supported in the elongated hole (12a). Also, the rear axle (
5a) is the center of swing of the machine including the work equipment in the longitudinal direction, so a sensor (15) is installed near the rear wheel axle (5a) to detect the angle of inclination in the longitudinal direction with respect to the horizontal direction, and the lift arm (11) A sensor (16) for detecting the rotation angle of the lift arm (11) is also provided at the base.

Further, a sensor (17) for detecting the rotation angle is also provided at the base of the position lever (19) for setting the height or plowing depth of the rotary tillage device (R). Signals from the sensors (15), (16), and (17) are input to the controller (20), which switches the control valve (21) to control the height, plowing depth, etc. (22) and (23) are variable apertures, which avoid sudden changes when going up and down and reduce shock.

(F) Function of the Invention In such a configuration, when the position lever (19) is set to an arbitrary position during tilling work in a horizontal state as shown in Fig. 1, the controller (
20), the control valve (21) is switched, and the lift arm (11) is rotated to lower the aircraft 01 from the parallel line l. At this time, the sensor (16) is outputting a feedback signal. Then, as shown in Figure 2, when the machine tilts by θ3 from the horizontal, the sensor (15) detects the angle, inputs it to the controller (20) and calculates it, and the rotary tiller (R) adjusts the angle to the set depth. The control valve (21) is switched so that In other words, if the front of the aircraft rises, the rear rotary tiller (R
) will be lowered, so the rotary tiller (R) must be raised accordingly, so the control valve (21) is switched to extend the hydraulic cylinder (10) and the lift arm (11) is moved to the appropriate depth. It is raised until it reaches θ2. On the other hand, if the front side tilts downward, the control valve (2) will lower the rotary tiller (R).
1).

(G) Effects of the Invention The present invention achieves the following effects by virtue of the above-described configuration.

First, it is now possible to forcibly drive the rotary tiller up and down, so the rotary tiller can quickly move up and down to follow irregularities in the field, and the tiller can be kept at a constant temperature. That's how it happened.

Second, since the plowing depth can be controlled by installing a sensor on the machine side, it has become possible to control the plowing depth of other working machines such as plows.

Thirdly, since the lift arm is forcibly lowered, it is possible to control the speed of descent, and the shock when lifting and stopping at the highest position and the shock at the initial stage of digging can be alleviated.

Fourthly, since the work machine can be lowered regardless of its weight, the weight of the work machine can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of an agricultural tractor equipped with the lifting device of the present invention. Figure 2 is a side view of an agricultural tractor when working in a field with uneven surfaces. Figure 3 is a hydraulic circuit diagram and a block diagram of electrical control. FIG. 4 is a side view of a tractor showing conventional plowing depth control. T...Tractor R...Rotary tillage device 5a...Rear wheel axle 10...Hydraulic cylinder 11...Lift arms 15, 16...Sensor 21...Control valve

Claims (1)

[Claims] A sensor (16) is provided at the rotation base of the lift arm (11) in the work equipment lifting device, and the hydraulic cylinder that rotates the lift arm (11) is replaced by a double-acting hydraulic cylinder (
10), and a sensor (15) for detecting inclination in the longitudinal direction is provided near the rear wheel axle (5a), and the control valve (21) is switched based on the signals from the sensor (15) and (16) to operate the work machine. Lift arm (11
) is a forcibly driven tractor work equipment lifting device.