JPH0348763B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plowing depth control device, and is particularly applicable to agricultural work in which plowing depth is automatically controlled by the expansion and contraction of a top link. The present invention relates to a plowing depth control device that facilitates the turning operation of a working machine at the edge of a ridge.

[Prior Art and Problems to be Solved by the Invention] In a conventional plowing depth control device, a top link was constructed from a cylinder and a piston rod, and this was driven by hydraulic pressure. It is described in Publication No. 135204. Furthermore, Japanese Utility Model Application Publication No. 113312/1983 discloses a top link in which plowing depth is controlled by automatic control means.

The former is simply a configuration in which the top link is hydraulically driven, and is not an automatic control means.
Furthermore, although the latter is an automatic control means, it does not disclose any means for facilitating and smoothing the turning operation at the edge of the ridge, especially during deep plowing work by automatically controlling the top link.

Therefore, in agricultural work where plowing depth is controlled based on the automatically controlled expansion and contraction of the top link, there are technical issues that need to be solved in order to enable the turning operation of the working machine at the edge of the ridge to be performed easily and smoothly. A problem arises, and the present invention aims to solve this problem.

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes a ground work machine connected to a power vehicle so as to be able to rise and fall freely, and the lifting mechanism having a hydraulic telescopic top link. and a setting means for setting the length of the top link and a detection means for detecting the length of the top link, and the length of the top link is set to a specified value set by the setting means. The control device is configured to control expansion and contraction of the top link, and includes means for detecting a lifting operation of the ground-based work equipment, and when the ground-based work equipment is descending, the automatic control of the top link is activated. , further comprising control means for shortening the top link to a predetermined length by stopping the automatic control operation by the means for detecting the lifting operation when the ground work machine is raised. The purpose is to provide a depth control device.

[Function] According to the present invention, while the ground working machine is descending, plowing work is performed by automatic control of the top link, and the plowing depth is maintained substantially constant. When the ground-based work machine is lifted, the automatic control state is canceled and the top link is shortened to a predetermined length, making it possible to lift the ground-based work machine to a large extent.
In particular, since the automatic control release operation and the top link shortening operation can be performed at the same time, the turning operation of the working machine at the edge of a ridge is facilitated.

[Embodiment and Effects] Next, an embodiment of the present invention will be described. The ground work machine 1 shown in FIG. , a top link 5 consisting of a cylinder 4 and a piston 4a.
The left and right lift arms 6, 6 and lower links 3, 3 are connected by left and right lift rods 7, 7, respectively, and the work equipment lifting lever 8 can be rotated up and down. For example, a lift piston of a hydraulic actuating mechanism (not shown) operates to rotate the lift arms 6, 6, thereby raising and lowering the ground work machine 1. Then, the length of the top link 5 is detected by a detection means 9 such as a potentiometer, and the length of the top link 5 is detected.
As a specifying means 10 for specifying the length of the work equipment lift lever 8, the resistor 11 of the potentiometer is
The length detected by the detection means 9 and the designated length designated by the designation means 10 are provided to be input into the comparison control means 12, and the As means for detecting the raising operation, the output of the atspa switch 13, which is activated when the ground descent lever 8 is operated to the highest raised position, is inputted to the comparison control means 12, and in addition to when there is an output from this atspa switch 13, A command is given from the comparison control means 12 to the actuating means 16, which includes an oil pump 14 and a switching valve 15, so that the length of the top link 5 is controlled to extend or contract to the length specified by the specifying means 10. Furthermore, when the atspa switch 13 operates, the comparison control means 12 gives a command to the operation means 16 so that the top link 5 becomes the shortest (the end switch 17 operates), and this comparison control means FIG. 3 is a flowchart showing the control operation of step 12.

Therefore, when the work equipment lifting lever 8 is raised, for example, in the direction of the arrow in FIG. Further, the length of the top link 5 is detected by the detection means 9, a potential corresponding to the detected length is inputted to the comparison control means 12, and the switching valve 1 is
5 supplies pressure oil from the oil pump 14 to the cylinder 4;
The top link 5 is adjusted to a specified length by discharging the top link 5, and at this time, the ground work equipment 1 is raised or lowered around the connecting pins 18, 18 connected to the lower links 3, 3. , piston 4a
When the top link 5 is pulled toward the cylinder 4, the top link 5
contracts and the ground work equipment 1 rises, making the plowing depth shallower. Conversely, when the piston 4a protrudes from the cylinder 4, the top link 5 extends and the ground work equipment 1 lowers, making the plowing depth deeper. It is what it is.

and in the illustrated embodiment, the front tail wheel 18
Since the front part of the ground working machine 1 is supported by the
Since the rotation operation is performed around the grounding point A of 8, there is an advantage that the sensitivity of plowing depth adjustment can be increased compared to the case where such front tail wheel 18 is not attached. It goes without saying that, in addition to the illustrated example, other embodiments having similar functions can be used for each of the above-mentioned means.

Since the present invention relates to the configuration described in detail in the above embodiment, when the ground work machine 1 is descending, the plowing depth is controlled based on automatic control of the extension and contraction operation of the top link, as in the conventional case. works to perform the plowing work. Therefore, it is natural that the plowing depth is maintained substantially constant, but if the ground work machine 1 is lifted, the automatic control state is canceled and the top link is shortened to a predetermined length. This makes it possible to lift the ground-based work machine 1 to a large extent.

That is, the present invention particularly provides an operation for canceling automatic control;
Since the top link can be shortened at the same time, the turning operation of the working machine at the edge of the ridge becomes extremely easy and smooth.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a tractor and ground work equipment, Fig. 2 is a control circuit diagram, and Fig. 3 is a flowchart. Description of symbols, 1...Ground work equipment, 2...Tractor, 4...Cylinder, 4a...Piston, 5...
Top link, 9...detection means, 10...designation means, 12...comparison control means, 16...operation means.

Claims (1)

[Claims] 1. The ground work equipment is connected to the power vehicle so that it can be raised and lowered freely, and the lifting mechanism is equipped with a hydraulic telescoping top link, and a setting means for setting the length of the top link, and a setting means for setting the length of the top link. A control device is provided with a detection means for detecting the height of the ground work machine, and is configured such that the length of the top link is controlled to extend or contract to a specified value set by the setting means. When the ground work equipment is lowered, the automatic control of the top link is activated, and when the ground work equipment is raised, the automatic control operation is stopped by the means for detecting the lifting operation. A plowing depth control device comprising: a control device for shortening a top link to a predetermined length;