JPS621682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary tillage device connected to a power agricultural machine such as an agricultural tractor. An object of the present invention is to provide an automatic adjacent tillage device for a power agricultural machine that automatically determines whether the rotary tiller is grounding or not without visual identification at the same time as the rotary tiller comes down and touches down, thereby making it possible to till uncultivated land adjacent to already cultivated land. It is something to do.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

First, the configuration will be explained. Reference numeral 1 denotes a rotary tilling device which is pivotally mounted at the rear of a power agricultural machine (not shown) to be able to rise and fall freely.
This tilling shaft 2 is planted in the longitudinal direction and consists of tilling claws 3, etc., and more specifically, an input that is pivotally supported along the front-rear direction at a left-right intermediate position of the front end of the rotary tiller 1. A bevel gear 5 is fixed to the rear end of the shaft 4, and the bevel gear 5 is always engaged with a bevel gear 7 on a transmission shaft 6 supported in the transverse direction.

The bevel gear 7 is fitted onto a spline 6a of the transmission shaft 6 carved along the longitudinal direction, and holds the outer end of the bevel gear 7 via a bearing 9 fixed to the inner peripheral side of the gear case 8. In order to transmit the rotation of the input shaft 4 to the transmission shaft 6 and to enable the transmission shaft 6 to move in the lateral direction with respect to the bevel gear 7, a spline groove (not shown in the drawing) that engages with the spline 6a is provided on the inner peripheral side of the bevel gear 7. ) is engraved.

10, 10 is a cylindrical connect bracket which is divided into left and right parts and covers the outer peripheral side of the transmission shaft 6, and these connect brackets 10, 10 are as follows:
It is fitted into the gear case 8 and can be laterally moved a predetermined distance together with the transmission shaft 6, and the lateral movement switching operation is performed by lateral movement of the piston rod 12 of the moving cylinder 11 fixed to the back of the gear case 8. Reference numerals 13, 13 designate arms that project rearward at the rear portions of the two connect brackets 10, 10, and these arms 13, 13 are connected to the piston rod 12. Reference numeral 14 denotes a chain case attached to one side of the connect bracket 10. A chain 17 is wound around two sprockets 15 and 16 provided inside the chain case 14, and the rotation of the transmission shaft 6 is controlled by the tilling shaft 2. tell.

Further, in Fig. 2, reference numeral 20 indicates a three-position electromagnetic control valve, 21 indicates a hydraulic pump, 22 indicates an oil tank, 23 and 24 indicate solenoids, and 25 and 26 indicate a three-position electromagnetic control valve for returning the electromagnetic control valve to the neutral position when it is not in operation. The return springs 27 and 28 are oil pipes that communicate with the moving cylinder 11 on one side and with the electromagnetic control valve 20 on the other side.

Next, the configurations of the height detection wheels and the average height detection wheels shown in FIG. 3 will be explained.

29... is a detection wheel, and this detection wheel 29... is installed in the horizontal direction, and moreover, the swing arm 31 is pivotally connected to an intermediate shaft 30 whose length is approximately equal to the tilling width.
It is rotatably attached to the rear end of..., and among the detection wheels 29..., the two wheels located on the left and right outer sides are the height detection wheels 29a, 29a, and the inner side thereof Multiple detection wheels 2 located
9... are the average height detection wheels 29b... 32
... is an operating rod, and the upper end of the operating rod 32 is connected to the potentiometer 33, and the lower end thereof is connected to the middle part of the swing arm 31.
The detection wheels 29 are always pressed downward by the springs 34 attached to the upper parts of the sensors 2.

When a step occurs between the average height determined by the average height detection wheels 29b and the height determined by the height detection wheels 29a, a potential difference is generated between each potentiometer, and the potential difference is sensed. The detection circuit is configured so that it is activated.

For this detection, for example, a detection circuit such as a bridge circuit may be configured to sense the average height detection wheel 29b located on the uncultivated land side A in the state shown in FIG. The reference height is determined by , and then the average value of those voltages is determined, and this is taken as the average potential. However, in this case, when the height detection wheels 29a, 29a located on the left side, that is, on the cultivated land side B in the figure, are operating, the height detection wheels 29a, 29a located on the right side, that is, on the uncultivated land side A in the same figure, are in operation. The height detection wheels 29a, 29a are provided with an operation changeover switch (not shown) so as to be in a lower operation state.

When the detection circuit is activated, when the height detection wheel 29a located at the left end is located on the cultivated land side B, the switch _S1 shown in FIG. 2 is closed, and the height detection wheel 29a is When the adjacent height detection wheel 29a is located on the cultivated land side B, the switch _S2 closes and the solenoid 23 of the electromagnetic control valve 20 closes.
An electric circuit C is configured to operate the .

S ₃ and S ₄ in FIG. 2 indicate that the two height detection wheels 29a and 29a located on the left side have run onto the uncultivated land side A and have a potential that is approximately equal to or greater than the average potential. This is a switch that closes its contacts when output is output from the potentiometers 33, 33 above it, and operates the solenoid 24 of the electromagnetic control valve 20.

In addition, in the figure, 35 is a pivot that supports the potentiometers 33, 35a is a side frame provided on the opposing part of the chain case 14, 36 is a mounting flange fixed to both ends of the tilling shaft 2, 37 is a mounting bolt, 38
is the power supply, 39, 39 is the rotary tillage device 1
machine frame, 40 is the stopper of spring 34, 4
1 is a front cover, 42 is a main cover that covers the upper part of the rotary tilling device 1, and 43 is a rear cover.

Next, the operation of this invention will be explained.

When a PTO shaft (not shown in the drawings) of a power agricultural machine (not shown) is connected to the input shaft 4 of the rotary tiller 1 via a coupling such as a joint, and the power of the engine (not shown in the drawings) is transmitted to the input shaft 4 side, Input shaft 4
The rotation of the transmission shaft 6 is transmitted by the engagement between the bevel gear 5 provided at the shaft end of the transmission shaft 6 and the bevel gear 7 on the transmission shaft 6, and this rotation is transmitted through the chain 17 wound around the sprockets 15 and 16 in the chain case 14. The rotation of the tilling shaft 2 is transmitted to the tilling shaft 2, and the field is tilled by the tilling claws 3.

When this power agricultural machine comes to the edge of the ridge and turns back, the average height detection wheel 29b located in front of the rotary tillage shaft 2 is moved to the uncultivated land side A.
The average height at the wheels 29b is sensed, and the average potential is output based on the potential from the potentiometers 33 located above the wheels 29b.

At this time, among the detection wheels supported by the intermediate shaft 30, the two height detection wheels 2 located on the outer side
If even one of the wheels 9a and 29a approaches the cultivated land side B, the above-mentioned detection circuit is activated, and the height detection wheel 2
9a and the average height detection wheels 29b... and the switch _S1 of the control electric circuit C closes the electromagnetic control valve 20 in FIG. There's no need to move it.

Furthermore, since the power agricultural machine moved closer to the cultivated land side B, the other height detection wheel 29a moved to the cultivated land side B.
When the switch approaches S ₁ and S ₂ , an electric circuit is formed with the contacts closed, and the solenoid 23 is activated.
Solenoid control valve 20 while resisting return spring 26
switch to the right position.

Next, the oil in the oil tank 22 is pumped into the hydraulic pump 21.
is sent to the left inside the moving cylinder 11 and presses the piston rod 12 to the right, but since the piston rod 12 is connected to the connect brackets 10, 10 via the arm 13,
As the piston rod 12 moves to the right, the connect brackets 10, 10 move a predetermined distance in the same direction.
Chain case 14 attached to the outer part of 0
Then, the tilling shaft 2 held at the lower end of the side frame 35a is moved to the uncultivated land side A.

And the height detection wheel 29a located inward.
When the tiller climbs onto the uncultivated land side A, the switch _S2 opens and the solenoid control valve 20 is returned to the middle position, and the rotary tiller 1 has a slight overlap in the vicinity of the boundary between the cultivated land and the uncultivated land. Tillage is allowed and tillage work is carried out.

On the other hand, the two height detection wheels 29a, 29a located on the outer left side in FIG. Yometer 33,
33 outputs a potential approximately equal to or greater than the average potential, the switches S ₃ and S ₄ in FIG.
are sequentially closed to operate the electromagnetic control valve 20, and switch the electromagnetic control valve 20 to the left position while resisting the return spring 25.

Then, the oil in the oil tank 22 is sent to the right in the moving cylinder 11 by the hydraulic pump 2, pushing the piston rod 12 to the left and moving the tilling shaft 2 to the left to the uncultivated land side A. Let it happen. Then, when turning again at the edge of the field, the height detection wheels 29a, 29a located on the uncultivated land side A in FIG. Change the operation selector switch so that it can be used.

As explained above, the present invention has two height detection wheels on the left and right outer sides, and a plurality of height detection wheels on the left and right intermediate portions in front of the tilling shaft of the rotary tiller, which is pivotally mounted to the rear of the machine so that it can be raised and lowered. The wheels for average height detection are mounted on shafts along the lateral direction so that the wheels for average height detection are positioned, and the displacement of the wheels for height detection on the left and right sides and the proportional displacement of the wheels for average height detection at the left and right intermediate portions are determined. A detection circuit is configured to electrically detect the displacement difference between the
Only one height detection wheel is activated, and two wheels on the uncultivated land side are activated.
An operation changeover switch is provided to disable the two height detection wheels, and the connection bracket of the rotary tiller, in which the transmission shaft is internally mounted, is connected to the gear case in conjunction with the piston rod of the moving cylinder of the hydraulic system. It has a structure that can be slid laterally, and when the two height detection wheels on the cultivated land side are located on the cultivated land, the rotary tilling shaft with the tilling claws is moved to the uncultivated land side with the movement of the connecting bracket. In addition, when the detection wheel is located on the uncultivated land side, the automatic adjacent tillage device of the powered agricultural machine is constructed by interlocking the detection circuit and the electromagnetic control valve of the hydraulic device in order to move the rotary tillage shaft toward the cultivated land side. Therefore, the displacement of the two height detection wheels on the cultivated land side is always compared based on the average displacement of the plurality of average height detection wheels depending on the height of the uncultivated land side,
It is possible to operate the hydraulic system that moves the tillage shaft without being affected by extreme heights on the uncultivated land side, and when turning back at the edge of the field, only the two height detection wheels on the cultivated land side are activated. By changing the operation changeover switch so that the reciprocating adjacent tillage is always slightly overlapping, there is no untilled residual tillage at the boundary between the tilling strokes of reciprocating adjacent tilling, and the reciprocating adjacent tilling work is facilitated. , can improve the quality of their work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the automatic adjacent cultivating device according to the invention, Fig. 2 is a developed view of the operation, and Fig. 3 is a perspective view of the main parts. be. Explanation of symbols, 1...Rotary tillage device, 2
... Tilling shaft, 3, ... Tilling claw, 4 ... Input shaft, 5 ... Bevel gear, 6 ... Transmission shaft, 7 ... Bevel gear, 8 ... Gear case, 9 ... Bearing, 10, 10 ... Connect Bracket, 11...
...Moving cylinder, 12... Piston rod, 1
3, 13... Arm, 14... Chain case, 1
5... Sprocket, 16... Sprocket, 1
7...Chain, 20...Solenoid control valve, 21...Hydraulic pump, 22...Oil tank, 23, 24...Solenoid, 25, 26...Return spring, 2
7, 28... Oil pipe, 29... Detection wheel, 30...
Intermediate shaft, 31... Swing arm, 32... Operating rod,
33... Potentiometer, 34... Spring, 35a... Side frame, 36... Mounting flange, 3
7...Mounting bolt, 38...Power supply, 39...Machine frame, 40...Stopper, 41...Front cover, 4
2...Main cover, 43...Rear cover.

Claims (1)

[Claims] 1. In front of the tilling shaft of the rotary tilling device, which is pivotally attached to the rear of the machine so that it can be raised and lowered, there are two height detection wheels on each side on the left and right sides, and a plurality of average height detection wheels on the left and right middle parts. It is mounted on axle along the lateral direction so that In addition to configuring a detection circuit for detection, this detection circuit has an operation that, when tilling, only the two height detection wheels on the cultivated land side operate and the two height detection wheels on the uncultivated land side are inactivated. A changeover switch is provided, and the connecting bracket of the rotary tilling device, in which the transmission shaft is internally mounted, is configured to be slidable laterally with respect to the gear case in conjunction with the piston rod of the moving cylinder of the hydraulic device. When the two height detection wheels on the cultivated land side are located on the cultivated land, the rotary tilling shaft with tilling claws installed is moved to the uncultivated land side as the connecting bracket moves, and the height detection wheels are moved to the uncultivated land side. An automatic adjacent tillage device for a powered agricultural machine, which is constructed by interlocking a detection circuit and an electromagnetic control valve of a hydraulic device in order to move a rotary tillage shaft toward already cultivated land when the rotary tillage shaft is located.