JPS6230884Y2 - - Google Patents

Description

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

``Prior Art'' Conventionally, there has been a technique (for example, Japanese 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 by a hydraulic cylinder to correct the lateral inclination. It was hot. In addition, technology to keep the earthwork horizontal by attaching a tilting detection device to the earthwork board used for leveling work on earthmoving machines (for example,
Publication No. 17443) was published.

``Problem that the invention attempts to solve'' However, rotary working machines have a lower link rear end connected to a substantially vertical upper part of the rotary tilling claw axis, and a height-adjustable tilling depth gauge behind the rotary tilling claw. The lower part of the rotary working machine is configured such that the tilling depth is set by attaching the member and bringing the gauge member into contact with the deepest tilling surface of the tiller claw, and the lower part of the rotary work machine is tilted in the longitudinal direction of the machine body when the tilling depth is adjusted by the gauge member. Since the support height of the link was changed, conventional earthwork plate control, which does not require control such as the tilling depth adjustment described above, cannot be easily applied to rotary work machines. By making the plowing uniform, there is a risk that the overall plowing depth will change, which has the disadvantage that it is difficult to uniformly grow crops.

"Means for solving problems" This invention eliminates the above conventional drawbacks,
The center portion of either the left or right lower link is connected to the lift arm via a lift rod and a horizontality correction device, and the center portion of the other lower link is connected to the lift arm via the lift rod, and the center portion of the lower link is connected to the lift arm via the lift rod. In a structure in which rotary working machines are connected to each other, a tilting detection device for detecting tilting of the rotary working machine in the left and right direction is provided approximately in the upper center of the rotary working machine, and a tilting detection device is provided approximately perpendicular to the rotary axis line of the rotary working machine. The tilt detection device is located above.

"Operation" Therefore, it is possible to symmetrically detect the tilting of the rotary working machine to the left and right, and the tilting detection device can be configured with an extremely simple structure using, for example, a U-shaped tube and a pendulum, and the tilting of the rotary working machine can be detected symmetrically. The horizontal tilt of the machine is caused by the ground contact surface of the tractor or work equipment, so the center of rotation of the tilt is always near the ground surface. It is possible to increase the positional displacement of the tilt detection device located on the aircraft side, and the detected acceleration of the tilt detection device when the device is tilted is increased. When applied to a detection device, there is a problem that a detection delay occurs in normal detection operation, but the detection delay of the detection device, which is structured to prevent malfunction due to vibration, is prevented because the detection acceleration of the detection device is large. In addition, it is possible to easily detect left and right tilts at positions above the rotary work machine where the positional displacement is large, and the horizontal posture of the rotary work machine can be accurately determined based on proper left and right tilt detection by the tilt detection device. Moreover, since the detection device is installed above the rotary at approximately the center of the working machine, the tractor can be rotated to change direction during plowing work in fields, etc., which is performed by reciprocating the direction at the headland. At this time, the working equipment moves up and down from left to right around this approximate center, and changes from leaning to the left to leaning to the right (or in the opposite direction) with respect to the tractor, but in this direction change, the working equipment moves to the center position where the displacement is smallest. Since the detection device is supported, when changing direction in the opposite direction,
The centrifugal force acting on the detection device can be reduced, and malfunction of the detection device due to the centrifugal force can be prevented.

"Embodiments" Examples of the present invention will be described below in detail based on the drawings. Figure 1 is a schematic side view of agricultural tractor A, Figure 2 is a schematic side view of agricultural tractor A;
The figure is a plan view of the same part, where 1 is the engine part, 2 is the clutch part, 3 is the transmission part, 4 is the PTO shaft,
5 is a handle, 6 is a seat, 7 is a front wheel, 8 is a rear wheel, 9 is a rear axle, 10 is a side drive type rotary working machine that is an agricultural work machine, and one end is pivotally connected to the machine body, that is, the transmission case 3a. The working machine 10 is attached to the rear of the tractor A so that it can be raised and lowered using a three-point link mechanism B consisting of a pair of lower links 12, 12 and a top link 11, and the PTO
The rotary tilling claws 14 are configured to be rotationally driven via a bendable power transmission shaft 13 connected to the shaft 4.

Further, the rotary working machine 10 includes a hydraulic lift 15 fixed on the mission section 3, a pair of lift arms 16, 16, and lift rods 16a, 16.
They are connected to each other so that they can be raised and lowered via b. The hydraulic lift 15 is configured to be controlled by a hydraulic switching valve 18 interlocked with a position control lever 17 via a spool and a push rod (not shown).

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 the top link hinge 19. The base end of the top link 11 is pivoted to the rear end of the bracket 20.

The rotary working machine 10 includes a rotary transmission case 21, a rotary tilling claw 14, a main rotary cover 22 and a side rotary cover 23 that cover the upper area and the sides of the tilling claw 14, respectively.
A pair of left and right gauge wheels 24, 24 located at both rear ends of the rotary tilling claw 14, and a portal beam 2 for supporting each gauge wheel 24, 24.
5 and depth adjust frames 26, 26, etc.

The tractor A is located approximately in the upper center of the main rotary cover 22 of the rotary working machine 10, for example.
A tilt detection device 27 for detecting tilting of the working machine 10 in the left-right direction is installed on the longitudinal center line of the machine, and is also provided between the left lift arm 16 and the left lower link 12 corresponding to this arm 16. An electric cylinder 28 is interposed therebetween, which is a horizontality correction device that swings only the lower link 12 based on the output of the detection device 27, and as is clear from FIG. The tilt detection device 27 is located approximately perpendicularly above the axis line.
position.

In addition, in FIG. 1, only the related structure between the lift arm 16 and the lower link 12 on the left side is illustrated, but as shown in FIG. A lift rod 16b of a known structure is stretched between them.

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 to the battery 36, and the other terminal 30b to the terminal 28a of the electric cylinder 28,
One terminal 31a of the reed switch 31 is connected to ground, and the other terminal 31b is connected to the terminal 28b of the cylinder 28 to form a piston rod reciprocating circuit for reciprocating the piston rod 37.

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 28 of the cylinder 28.
a to form a piston rod forward movement circuit that moves the piston rod 37 forward.

Note that the cylinder block 2 of the cylinder 28
The upper end of the piston rod 8c is connected to the lift arm 16 via the upper lift rod 38, and the lower end of the piston rod 37 of the cylinder 28 is connected to the center portion of the lower link 12 via the lift link 39.
8c and the piston rod 37 form the left lift rod 16a.

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 moved up to the position where the reed switches 30 and 31 are disposed due to the flow of the liquid L. Move up to turn on the 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 (not shown),
Terminal 28b of cylinder 28, reed switch 30
A piston rod reciprocating circuit consisting of the piston rod 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. This is to be corrected.

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

Therefore, the battery 36 and reed switch 3
2. Internal electrical elements such as the terminal 28b of the cylinder 28 and the excitation solenoid of the cylinder 28 (not shown);
Terminal 28a of cylinder 28, reed switch 33
The piston rod reciprocating circuit consisting of the piston rod 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 arrow b in FIG. This is to be corrected.

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.

"Effects of the Invention" As is clear from the above embodiments, the present invention allows the center portion of either the left or right lower link 12 to be connected to the lift arm 16 via the lift rod 16a and the horizontality correction device 28, and the center portion of the lower link 12 to the other lower link. 12
In a structure in which the central portions of the rotary working machine 10 are connected to the lift arm 16 via the lift rod 16b, and the rotary working machine 10 is connected via the lower links 12, 12, the tilting of the rotary working machine 10 in the left-right direction is detected. A tilt detecting device 27 is provided approximately in the upper center of the rotary working machine 10, and the tilt detecting device 27 is located approximately vertically above the axis of the rotary 14 of the rotary working machine 10. 10 can be detected symmetrically, and the tilt detection device 27 can be configured with an extremely simple structure using, for example, a U-shaped tube 29 and a pendulum. In addition, since the horizontal inclination of the work implement 10 is caused by the ground contact surface of the tractor A or the work implement 10, the center of rotation of the inclination is always near the ground surface, and the higher the ground clearance of the work implement 10, the more the tilt movement The rotation radius of the working machine 10 is increased, and the positional displacement of the tilting detection device 27 at the upper side of the working machine 10 can be increased.
The detected acceleration becomes larger. Therefore, when a buffering (absorber) action is given to the tilt detecting device 27 to prevent malfunction due to vibration of the tilt detecting device 27, there is a problem that a detection delay occurs in the normal detecting operation, but the detected acceleration of the detecting device 10 By having a large value, it is possible to prevent a delay in detection of the detection device 27, which is structured to prevent malfunction due to vibration, and to easily detect left and right tilting at a position on the upper side of the rotary working machine 10 where the positional displacement is large. , the horizontal posture of the rotary work machine 10 can be accurately detected based on proper left and right tilt detection by the tilt detection device 27. Furthermore, since the detection device 27 is provided above the rotary 14 at approximately the center of the working machine 10, the tractor A can be rotated to change direction during plowing work in a field, etc., which is performed by traveling back and forth and changing direction at the headland. At this time, the working machine 10 is raised and lowered from left to right around this approximate center, and is switched from leaning to the left to leaning to the right (or in the opposite direction) with respect to the tractor A, but in this direction change, the displacement of the working machine 10 is the smallest. Since the detection device 27 is supported at the center position, the centrifugal force acting on the detection device 27 can be reduced when the tilt is changed in the opposite direction during a direction change, and the centrifugal force acting on the detection device 27 can be reduced.
This has the effect of preventing malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a side view of an agricultural tractor showing an embodiment of the present invention, FIG. 2 is a partial plan view of the same, and FIG. 3 is a system diagram showing a horizontal control device. 10...Rotary working machine (agricultural working machine), 12...
...Lower link, 14...Rotary, 16...Lift arm, 16a, 16b...Lift rod, 2
7...Tilt detection device.

Claims (1)

[Scope of utility model registration request] The center portion of either the left or right lower link 12 is connected to the lift arm 16 via the lift rod 16a and the horizontality correction device 28, and the center portion of the other lower link 12 is connected to the lift arm 16 via the lift rod 16b. At the same time, the rotary work machine 10 is connected to the rotary work machine 10 via the lower links 12, 12.
In the structure in which the rotary working machine 1
Tilt detection device 2 that detects tilting of 0 in the left and right direction
7 is provided approximately in the upper center of the rotary working machine 10, and the rotary 1 of the rotary working machine 10 is
A horizontal control device for an agricultural machine, characterized in that the tilting detection device 27 is located substantially vertically above a four-axis core line.