JPH03262404A - Load-controlling mechanism of rotary tiller - Google Patents

Abstract

PURPOSE:To enable stable tilling work by detecting the loading state by the change of the rotational speed of an engine and automatically turning a tilling cover around a claw shaft to keep the work load within the optimum range. CONSTITUTION:The state of load in tilling work is detected by the change of the rotational speed of an engine E and a tilling cover 2 is automatically turned around a claw shaft according to the loading state to keep the work load within the optimum range. Preferably, a tilling depth sensor 31 is attached to a rotary tiller and the tiller is vertically moved by the signal transmitted from the tilling depth sensor to enable the control of the tilling depth.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention provides the following features:
This relates to a control mechanism that reduces the load and maintains a constant load state when the load applied to the tilling claws changes due to changes in soil quality, moisture content, etc.

(B) Prior Art Conventionally, there is a technology related to a load control mechanism of a rotary tiller, such as the technology described in Japanese Patent Application Laid-Open No. 124510/1983.

(C) Problems to be Solved by the Invention However, in the conventional technology, changes in load are detected as changes in engine speed, and when the load becomes excessive, the rotary tilling device is controlled by a hydraulic mechanism. By raising the plow, the depth of plowing could be made shallower, thereby reducing the load.

When the load control mechanism is configured as in the above conventional technology,
The structure prioritizes keeping the load on the tractor's engine and tilling claws constant, but at the cost of this, there is a problem in that the plowing depth, which is the quality that should be kept constant through control, changes. It is.

In the present invention, when an excessive load is applied, the operation to reduce this excessive load and return to the original load is not performed by changing the tilling depth, but by changing the tilling claws while keeping the tilling depth as it is. The adjustment is reduced by changing the relative position of the tilling cover that covers the rotating outer periphery of the tilling claw.

In addition to providing a load control mechanism by rotating the tilling cover back and forth, we also have a tilling depth control mechanism that maintains a constant tilling depth while keeping the load constant. This made it possible.

Further, in the configuration that enables constant load control by rotating the tilling cover back and forth, the tilling cover and the pawl shaft can further be slid left and right with respect to the position of the tractor.

If the tilling cover and the claw shaft are made to be slidable left and right in this way, it becomes difficult to arrange the mounting position of the feed bank link that operates the tilling cover rotation sensor.

In the present invention, this problem is solved by arranging both the tilling cover rotation sensor and the feed bank link on the slide side near the tilling cover and the claw shaft.

(d) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be explained.

The load condition during tilling work is detected by changes in the engine speed, and the tilling cover is automatically rotated around the claw axis according to the load condition to maintain the work load within the optimum range.

Further, a tilling depth sensor is attached to the rotary tilling device, and the rotary tilling device can be raised and lowered in response to a signal from the tilling depth sensor, thereby making it possible to also control the tilling depth.

In addition, in a configuration in which the tilling cover is automatically rotated around the pawl shaft and the tilling cover and the pawl shaft can be slid left and right, the feedback link that feeds the amount of longitudinal movement of the tilling cover can be slid left and right. It is installed on the moving side.

(E) Embodiment The problems to be solved by the present invention and the means for solving them are as described above.Next, the structure of the embodiment shown in the attached drawings will be explained.

Fig. 1 is a side view of a rotary tiller equipped with the load control mechanism of the present invention, Fig. 2 is a plan view showing the slide mechanism portion, and Fig. 3 is a side view of the rotary tiller further equipped with a tillage depth control mechanism. , FIG. 4 is a control flowchart.

Figures 1 and 2 show an embodiment that is equipped with a load control mechanism by rotating the tillage cover 2 back and forth and a slide rotary tiller, but is not equipped with an automatic tillage depth control device. ing.

An input shaft 2] is provided protruding from the front of the hevel gear box 20, and rotation is transmitted to the input shaft 21 from the PTO shaft of the tractor via a universal joint.

Fixed main beams 5' and 5' project from the beherga box 20 to the left and right, and inside the fixed main beams 5' and 5' there are slide main beams 5 and 5 that can slide left and right. It is fitted.

A power transmission shaft for transmitting power to the chain case 27 is extendably arranged inside the fixed main beam 5''/5° and the slide main beam 5/5.

The part of Hehergyabosoku 20 is pivoted to the lower link and top link of the tractor so that it can move up and down, and cannot slide left and right.
With respect to the fixed main beams 5' and 5', sliding main beams 5 and 5 fitted inside the fixed main beams 5' and 5' can be slid left and right by hydraulic pressure, motors, etc.

The left and right ends of the slide main beams 5.5 are fixed to the side plates of the tillage cover 2, and the slide main beams 5.
5 slides left and right, the tilling cover 2, chain case 27, claw shaft 30, and tilling claw 18 slide left and right.

In the present invention, the fixed main beam 5'
A sub-beam 4 is arranged parallel to the slide main beams 5 and 5, one of which passes through on the left and right, and both ends are fixed to the side plates of the tilling cover 2.

Therefore, the sub-beam 4 naturally slides left and right.

A feed bank link 6 is interposed between the sub-beam 4 and a tilling cover rotation sensor 3 provided on the tilling cover 2. Therefore, both the feed bank link 6 and the tilling cover rotation sensor 3 are connected to the tilling cover 2 and the tilling claw 1.
It moves left and right as the number 8 slides.

Further, a tail wheel support rod 15 is pivotally supported at the rear end of the bevel gear box 20 so as to be movable up and down, and an adjustment handle support 11 is provided to protrude from the rear end of the bevel gear box 20 via a mounting bracket 12.

A tail wheel adjustment handle 13 that moves up and down on a tail wheel support rod 15 and a screw telescopic device 4 are interposed on the adjustment handle support 11.

Further, a tilling cover back-and-forth rotation motor 1 is pivotally supported by the adjustment handle support 11, and a screw extension/contraction device 17 projects from the tilling cover back-and-forth rotation motor 1 toward a bracket 8 that protrudes from the tillage cover 2. It is set up.

Therefore, by rotating the tilling cover back and forth rotating motor 1 in the forward and reverse directions, the tilling cover 2 can be rotated back and forth via the screw extension and contraction device 17.

A hanger rod support 19 is fixedly protruded above the tillage cover 2, and on the top of the hanger rod support 19, the tip of a hanger iron 26 shown in FIG. 3 is slidable up and down. And it is supported so that it can rotate back and forth.

Further, a tilling cover rotation sensor 3 is arranged and housed in the hanger rod support 19.

An interlocking arm 7 protrudes from the tilling cover rotation sensor 3, and is pivotally connected to a feedback link 6 whose front end is pivotally supported on the sub-beam 4.

Therefore, when the tilling cover back and forth rotation motor 1 rotates forward and backward, the screw telescopic bag W17 expands and contracts, and the bracket 8 is rotated up and down, and the tilling cover 2 is rotated back and forth around the claw shaft 30. be.

As the tilling cover 2 rotates, the hanger rod support 19 also rotates back and forth, so the tilling cover rotation sensor 3 is also rotated to the 3'' position.

When the tillage cover rotation sensor 3 rotates up to 3", the interlocking arm 7 protruding from the tillage cover rotation sensor 3 and the feed bank link 6 protruding from the sub-beam 4 rotate, and the interlocking arm 7 rotates. The potentiometer changes the signal from the tilling cover rotation sensor 3 located at the bottom of the tank.

Reference numeral 16 denotes an extended side plate extending rearward from the side plate 2a of the tillage cover 2.

Next, it will be explained with reference to FIG.

In FIG. 3, an automatic load control mechanism that keeps the load constant and an automatic tilling depth control mechanism that keeps the plowing depth constant are provided.

A load sensor S is provided on the side of the engine E. The load sensor S may be a sensor that detects changes in the load based on fluctuations in the rotational speed of the engine E, or may be a sensor that detects the load based on the exhaust temperature of the engine E or the like.

The load value detected by the load sensor S is transmitted to the controller C. Further, the tilling cover 2 is operated back and forth in response to the load value, and the rotated position is fed back to the controller C by the tilling cover rotation sensor 3.

Also, use the tilling depth setting dial D to set the desired tilling depth,
A plowing depth signal from a plowing depth detecting section, which is also used by the rear cover 25, is converted into an electric signal by a plowing depth sensor 31 and sent to the controller C as an electric signal.

A plowing depth sensor 31 for automatic plowing depth control is also attached to the side surface of the hanger rod support 19.
1 and a rotating rear cover 25 are connected by a sensor arm 22, an interlocking link 23, and a rotating arm 24.

When the actual plowing depth detected by the plowing depth sensor 31 and the set plowing depth set by the plowing depth setting dial D change, the rotary tilling device itself is raised and lowered by the hydraulic system of the tractor to reach the predetermined plowing depth. The goal is to maintain the

Next, referring to FIG. 4, a control flowchart will be explained.

At the start of the control, the set value set by the plowing depth setting dial D is read. This starts the automatic plowing depth control.

Next, the tilling cover back and forth rotation motor 1 is rotated to set the value A, which is the first set value for load control. This A value is the standard state of tillage load.

Next, turn the tilling load control switch on the operation panel to O.
Determine whether the tillage load control switch is set to N and set it to O.
In the case of FF, the tilling cover front and back rotation motor 1 is A(!
It is fixed in this position.

The tillage load control then ends.

Next, when the tillage load control switch is ON, engine down ratio constants α and β are read.

The engine down ratio constants α and β are values indicating how much the engine speed has decreased from the standard engine speed due to a load, and the engine down ratio constant α is
This is the case when the number of revolutions reaches 70%, which is 0.7, and β is 9.
This is the case where the rotation speed is 0.9.

Next, the no-load rotation speed ERmax of the engine E is detected.

Next, the working rotation speed ERchk is detected.

Then, the engine down ratio constants α and β, and E Rma
x/E Rchk is compared, and if the engine down ratio is greater than the engine down ratio constant α, the control returns to the start.

When the engine down ratio is lower than the engine down ratio constant α, the tilling cover back and forth rotation motor 1 is rotated to reduce the load, and the tilling cover 2 is rotated in a direction with less load. Normally, by rotating the tilling cover 2 forward, the distance between the tilling cover 2 and the tilling claws 18 is widened, and the load is reduced.
This shortens the screw extension/contraction device 17 and rotates the tilling cover 2 forward.

Furthermore, after the load reduction control, the working rotation speed E
Rchk is detected, the engine down ratio is calculated, and this ratio is compared with the engine down ratio constant β.

When the engine down ratio has recovered to a state larger than the engine down ratio constant β, the tilling cover front and rear rotation motor l is rotated to return it to the value A, and the control continues until the middle of the flowchart is reached again. do.

If the engine down ratio has not recovered to the engine down ratio constant β, the working rotation speed ERc is maintained until the engine down ratio falls below the engine down ratio constant β.
The control continues by detecting hk and comparing it with the engine down ratio constant β.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

According to claim (1), the load condition during tilling work is detected by a change in engine rotation speed, and the tilling cover is automatically rotated around the claw axis according to the load condition to maintain the work load within the optimum range. Therefore, unlike the load control device of a conventional rotary tillage device, in order to keep the change in load constant, the tillage depth is not controlled by manipulating the tillage depth, but by rotating the tillage cover 2 back and forth. Since the load is controlled to be constant, the plowing depth does not change, so it is possible to maintain the load constant while maintaining the principle of constant plowing depth, which is the most important factor in tillage quality. It has become.

Furthermore, by controlling the tilling load to a constant level, accidents such as engine stoppages no longer occur during tilling with the rotary tiller.

In addition, by controlling the load on engine E to a constant level,
Engine E has low fuel consumption and low noise,
This made it possible to continue cultivating the land.

As claimed in claim (2), a tilling depth sensor is attached to the rotary tilling device, and the rotary tilling device is raised and lowered according to the signal from the tilling depth sensor, so that tilling depth control can also be performed. , it is possible to avoid overload of the large engine E, and furthermore, by using the load control mechanism that rotates the tilling cover 2 back and forth, it is also possible to avoid a small overload, so that the engine E can be rotated in a stable state. , plowing work can be continued.

According to claim (3), in a configuration in which the tilling cover is automatically rotated around the claw shaft and the tilling cover and the claw shaft are slidable left and right, the feed bank feeds back the amount of back and forth rotation of the tilling cover. Since the link is provided on the side that slides left and right, in the case of a slide rotary,
Since the tilling cover 2 and tilling fly 8 slide against the bevel gear box, there is a risk that the feedback link 6 may be twisted or damaged due to movement of the relative positions of each part. By arranging the feedback link 6 on the slide side as in the present invention,
The above concerns were resolved.

[Brief explanation of drawings]

Fig. 1 is a side view of a rotary tiller equipped with the load control mechanism of the present invention, Fig. 2 is a plan view showing the slide mechanism portion, and Fig. 3 is a side view of the rotary tiller further equipped with a tillage depth control mechanism. , FIG. 4 is a control flowchart. C...Controller D...Pilling depth setting dial E...Engine S...Load sensor...Tilling cover longitudinal rotation motor 2...Tilling cover 3...Tilling cover times Motion sensor 4...Sub beam 5...Slide main beam 6...Feedback link 31...Plowing depth sensor

Claims (3)

[Claims] (1) The load condition during tilling work is detected by changes in engine speed, and the tilling cover is automatically rotated around the claw axis according to the load condition to keep the work load within the optimum range. A load control mechanism for a rotary tiller, characterized by: (2) A tilling depth sensor is attached to the rotary tilling device according to claim (1), and the rotary tilling device can be raised and lowered in response to a signal from the tilling depth sensor, thereby making it possible to also control the tilling depth. Load control mechanism for rotary tillage equipment. (3) In a configuration in which the tilling cover is automatically rotated around the claw shaft and the tilling cover and the claw shaft can be slid left and right, a feedback link that feeds back the amount of back and forth rotation of the tilling cover is attached to the left and right. A load control mechanism for a rotary tiller, characterized in that it is provided on the sliding side.