JPS6115686Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a horizontal control device for a rotary working machine that is used to always maintain horizontally a rotary working machine towed behind an agricultural tractor.

``Prior Art'' Conventionally, there has been a technique (for example, Utility Model Application Publication No. 50-50707) in which a pair of left and right lower links provided on a tractor are connected to one of the left and right lift arms using a hydraulic cylinder for horizontality correction. . There has also been a technique (for example, Japanese Utility Model Publication No. 17443/1983) by attaching a tilt detection device to the earthwork plate of an earthmoving machine for leveling work to keep it level.

``Problems to be solved by the invention'' However, in the above-mentioned conventional technology, there was no consideration given to the mounting position of the tilt detection device attached to the work machine, so there is a risk that the position of the detection device would change significantly when going up and down, etc. In addition, there was a problem that a large acceleration was instantaneously applied to the detection device due to mechanical vibration or the like.

``Means for Solving the Problems'' However, the present invention deals with the support structure of a rotary working machine and attaches a tilting detection device.
The center portion of the left and right lower links, one end of which is pivotally connected to the machine body, is connected to the left and right lift arms via a lift rod, and a rotary work machine is connected to the free end of the lower link, in which the work machine is moved in the left-right direction. A tilt detection device for detecting inclination is arranged close to the rotary work machine connection portion of the lower link and the rotary work machine connection portion of the depth adjust frame, and when viewed from the side, the tilt detection device is arranged close to the rotary work machine connection portion of the lower link and the depth adjustment frame. The tilt detection device is provided at the upper end of the rotary transmission case at a close position.

"Function" Therefore, by arranging the tilting detection device at a position close to the rotary work machine connection part of the lower link, which is the center of the forward and backward rotation of the work machine, the lower link connection part can be prevented from moving when going up or down, etc. Since the positional change of the detection device at the center is kept to a minimum and large instantaneous acceleration is not applied, the detection action is not disturbed, and malfunctions due to mechanical vibrations can be easily prevented, and the transmission Since the tilt detection device is provided at the upper end of the case, it is possible to easily prevent the detection device from malfunctioning due to impact during tilling work, and to simplify the support structure of the detection device by utilizing the strength of the transmission case. be.

"Embodiments" Examples of the present invention will be described below in detail based on the drawings. Figure 1 is a schematic side view of an agricultural tractor, in which 1 is the engine, 2 is the clutch, 3 is the transmission, 4 is the PTO shaft, 5 is the handle, 6 is the seat, 7 is the front wheel, and 8 is the rear. Wheel 9 is the rear wheel.

Reference numeral 10 denotes a side drive type rotary work machine, which includes a top link 11 and a pair of left and right lower links 1 whose one end is pivotally connected to the machine body, that is, the transmission case.
Tractor A by a three-point linkage mechanism with 2 and 12.
The rotary tiller claws 14 are rotatably driven by input via a bendable power transmission shaft 13 connected to the PTO shaft 4.

Further, the rotary working machine 10 is configured to be movable up and down via a hydraulic lift 15 fixed on the mission section 3 via a pair of lift arms 16, 16 and a lift rod. Said hydraulic lift 15
is configured to be controlled by a hydraulic switching valve 18 linked to a position control lever 17 via a spool and a push rod.

Further, a top link hinge 19 is attached to the rear end of the hydraulic lift 15, and a triangular hinge bracket 20 is fixed to this top link hinge 19. The base end of the top link 11 is pivoted to the rear end of the bracket 20.

The rotary work machine 10 includes a rotary transmission case 21, a rotary tilling claw 14, and a rotary tilling claw 14.
Main rotary cover 22 and side rotary cover 23 covering the upper area and sides respectively
, a pair of left and right gauge wheels 24 , 24 located at both rear ends of the rotary tilling claw 14 , a portal beam 25 and a depth adjuster frame 2 for supporting each of these gauge wheels 24 , 24 .
6, 26, etc.

A tilt detection device 27 is installed at the center of the upper part of the main rotary cover 22 of the rotary work machine 10, for example, to detect the tilt of the work machine 10 in the left-right direction. The rotary transmission case is arranged close to the rotary work machine 10 connection part and the rotary work machine 10 connection part of the depth adjust frame 26, and is located close to each connection part of the lower link 12 and the depth adjustment frame 26 when viewed from the side. The tilt detection device 27 is provided at the upper end portion of 21.

Also, the left lift arm 16 and this arm 1
A horizontality correcting device, such as an electric cylinder 28, is interposed between the lower link corresponding to No. 6, that is, the lower link 12 on the left side, and swings only this lower link 12 based on the output of the detection device 27.

Although FIG. 1 only shows the related structure between the lift arm 16 and the lower link 12 on the present side, there is a well-known structure between the lift arm 16 on the right side and the center part of the lower link 12 on the right side. The lift rod is being stretched.

Next, as shown in FIG.
consists of a U-shaped tube 29 into which liquid L is injected, reed switches 30 and 31 arranged at the upper left end of this U-shaped tube 29, reed switches 32 and 33 arranged at the upper right end of the tube 29, and It includes floats 34, 35 floating on the liquid L of the U-shaped tube 29, and the floats 34, 35 contain sufficient magnetic material to switch the reed switches 30-33.

Therefore, one terminal 30 of the reed switch 30
a is connected to the battery 36, and the other terminal 30b is connected to the terminal 28a of the electric cylinder 28,
One terminal 31a of the reed switch 31 is connected to the ground, and the other terminal 31b is connected to the terminal 28b of the cylinder 28 to form a piston rod return path for moving the piston rod 37 back.

Furthermore, one terminal 32 of the reed switch 32
a to the battery 36, the other terminal 32b to the terminal 28b of the cylinder 28, and one terminal 33a of the reed switch 33 to the ground.
In addition, the other terminal 33b is connected to the terminal 2 of the cylinder 28.
8a to form a piston rod forward movement path for moving the piston rod 37 forward.

The upper end of the cylinder block of the cylinder 28 is connected to the lift arm 16 via the lift rod 38.
Furthermore, the lower ends of the piston rods 37 are respectively connected to the central portion of the lower link 12 via lift links 39.

The present invention is constructed as described above, and when the rotary working machine 10 is tilted to the left or right or to the right or left high during plowing work, one of the floats 34 is tilted by the flow of the liquid L.
moves upward to the reed switch installation position, and turns on these reed switches 30 and 31.

Therefore, the battery 36 and reed switch 3
0, terminal 28a of cylinder 28, internal electrical elements such as excitation solenoid of cylinder 28, cylinder 28
The piston rod return path consisting of the terminal 28b, the reed switch 30, and the ground is closed, and the cylinder 28 is energized from the battery 36.

Therefore, the piston rod 37 of the electric cylinder 28 moves back in the direction of the arrow a in FIG. 2, moves the left lower link 12 upward, and corrects the rotary work machine 10, which is tilted in a low-left and high-right position, to a horizontal position. It is something.

Contrary to the above, when the rotary work machine 10 is tilted to the left and right, the other float 35 floats to the reed switch installation position due to the flow of the liquid L, turning on each of these reed switches 32 and 33. Activate.

Therefore, the battery 36 and reed switch 3
2. Internal electrical elements such as terminal 28b of cylinder 28, excitation solenoid of cylinder 28, cylinder 28
The piston rod forward movement path consisting of the terminal 28a, the reed switch 33, and the ground is closed, and the cylinder 28 is energized from the battery 36.

Therefore, the piston rod 37 of the electric cylinder 28 moves forward in the direction of the arrow b in FIG. 2, lowering the left lower link 12, and correcting the rotary working machine 10, which is tilted in a low-right and high-left position, to a horizontal position. It is something.

Furthermore, when adjusting the tilling depth of the rotary tilling claws 14, the support height of the gauge wheel 24 is changed by vertically swinging the depth adjust frame 26, and the support height of the gauge wheel 24 and the rotary tilling claws 14 is It changes the relative value of
The vertical inclination of the rotary work machine 10 is corrected by the vertical movement of the lower link 12, and the height of the tilling claws 14 from the ground is changed. At this time, the tilling claws 14
The lower link 12 and the depth adjust frame 26 are bent at their connecting portions by the lifting and lowering operation, and the detection device 27 is lifted and lowered substantially vertically together with the main rotary cover 22. On the other hand, tractor A
Since the rotary transmission case 21 is tilted backward in the direction of plunging into the soil by the traction of the rotary transmission case 21, the traction reaction force of the rotary tilling claw 14 at the lower end of the case 21 is reliably received by the case 21. case 21
is stably supported to reduce mechanical vibrations at the upper end of the case 21.

In the above embodiment, the electric cylinder 28 is used as the horizontality correction device, but it goes without saying that a hydraulic cylinder such as a hydraulic cylinder or a pneumatic cylinder may also be used. It goes without saying that even if mercury switches are used in place of the reed switches 30 to 33, the same effects as described above can be obtained.

"Effects of the Invention" As is clear from the above embodiments, the present invention connects the center portion of the left and right lower links 12, one end of which is pivotally connected to the fuselage, to the left and right lift arms 1 through the lift rod 38.
6, and a rotary work machine 10 is connected to the free end of the lower link 12,
A tilting detection device 27 for detecting tilting of the working machine 10 in the left-right direction is disposed close to the rotary working machine 10 connecting part of the lower link 12 and the rotary working machine 10 connecting part of the depth adjust frame 26, The tilt detection device 27 is mounted on the upper end of the rotary transmission case 21 at a position close to the connecting portions of the lower link 12 and the depth adjust frame 26 when viewed from the side.
By arranging the tilt detection device 27 at a position close to the connection part of the rotary work machine 10 of the lower link 12, which is the center of the forward and backward rotation of the work machine 10, the lower link is Changes in the position of the detection device 27 around the 12 connection are kept to a minimum, and no large instantaneous acceleration is applied, so the detection action is not disturbed and malfunctions due to mechanical vibration etc. can be easily prevented. In addition, since the tilting detection device 27 is provided at the upper end of the transmission case 21, it is possible to prevent malfunction of the detection device 27 during plowing work, and to provide a support structure for the detection device 27 that utilizes the strength of the arrangement of the transmission case 21. This has practical effects such as the ability to easily simplify the process.

[Brief explanation of the drawing]

FIG. 1 is a side view of an agricultural tractor equipped with a horizontal control device according to the present invention, and FIG. 2 is a system diagram showing the horizontal control device. 10... Rotary work machine, 12... Lower link, 16... Lift arm, 21... Rotary transmission case, 26... Depth adjust frame,
27...Tilt detection device, 28...Lift rod.

Claims (1)

[Scope of utility model registration request] The center portion of the left and right lower links 12, to which the body is pivotally attached at one end, is connected to the left and right lift arms 16 via a lift rod 38, and the lower links 12
In the structure in which the rotary work machine 10 is connected to the free end of the rotary work machine 10, a tilt detection device 27 that also detects the tilt of the work machine 10 in the left and right direction is connected to the rotary work machine 1 connection part of the lower link 12 and the depth adjust frame 26. The tilt detection device 27 is disposed close to the connecting portion of the rotary work machine 10 and is provided at the upper end of the rotary transmission case 21 at a position close to the connecting portions of the lower link 12 and the depth adjust frame 26 when viewed from the side. A horizontal control device for rotary work machines featuring: