JP2578670Y2 - Rear cover of rotary tilling equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear cover of a rotary tilling device.

[0002]

2. Description of the Related Art Conventionally, a rotary tilling device is mounted behind a tractor via a lifting link so as to be able to move up and down.
The upper part of the tilling nail is covered by the main cover, and the rear part is covered by the rear cover. These rotary covers perform important functions such as crushing the cultivated soil mass flipped up by the cultivating claws against the side of the cover and crushing them and then bouncing them off after tilling.The rear cover, in particular, has a leveling function after tilling. In addition, the structure has a function as a tillage sensor for controlling the tillage depth. For this reason, the rear cover is generally mounted vertically rotatably behind the main cover so that the free end is always in contact with the ground via a pressure rod wound with a pressure spring so as to maintain an appropriate pressure during normal tilling. I have.

[0003]

By the way, the lower end of the pressure rod is pivotally connected to a rear cover and the upper end is slidably supported by a bracket erected on a main cover, and is wound around the pressure rod. The mounted coil spring is free when the rear cover is not loaded, and when the rear cover moves up to a predetermined height, that is, when the tilling claw sinks to near the appropriate tilling depth, the pressing force by the spring is applied only after Therefore, in the actual work of rotary tilling, when the tilling claw is not yet settled to the predetermined depth at the beginning of tilling or when tilling is resumed immediately after recirculation, the tilling claw passes through the soil mass below the rear cover and abnormally A kicking condition has occurred, which has the disadvantage that the headlands and the four corners of the field are raised in a bulging manner, and each time the worker descends from the tractor. To adjust the pressure of the rear cover, or tilling the work after the end of the raised soil has required the work, such as to flatten Te.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and determines a target swing angle of a rear cover based on a set value of a tillage depth setting device. A working depth control unit that controls the lifting and lowering of the working unit to match the target swing angle set with the detected swing angle of the rear cover is provided, and a pressure spring with a pressure spring wound behind the main cover is provided. In a rotary tilling apparatus having a rear cover mounted so as to be vertically rotatable, a hydraulic cylinder is provided on the pressure rod so as to be capable of extending and retracting.
The rotary tiller descends with respect to the fuselage and the rear cover
The initial rear cover pressure when the
After a certain period of time, reduce the pressure of the rear cover.
It is characterized in that the expansion and contraction operation is controlled in such a way as to make it easier .

[0005]

Therefore, according to the present invention, when the rotary is lowered at the start of tilling or when the tilling is resumed immediately after recirculation, when the rear cover comes into contact with the ground, the initial pressing force at the time of contact with the ground is increased.
Then, after a certain period of time, the hydraulic pressure
Because the cylinder is controlled to extend and retract, the rear cover is temporarily in a strongly pressurized state, eliminating the phenomenon in which the cultivated soil mass passes under the rear cover and kicks out abnormally at the beginning of tilling, and can be used to eliminate headlands and four corners in the field. The cultivated soil mass is prevented from rising high, and can be finished neatly over the entire field.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described with reference to one embodiment shown in FIGS. 1 is a tractor main unit, 2 is a lift arm, 3 is a top link, 4 is a lower link, 5 is a PTO shaft, 6 is a lift rod connecting the lift arm 2 and the lower link 4, and 7 is a hitch frame. Reference numeral 8 denotes a rotary tilling device (hereinafter simply referred to as a rotary), which can be automatically attached to and detached from the machine 1 via the hitch frame 7, and the power is transmitted from the PTO shaft 5 of the machine 1 to a free joint shaft 9. After being transmitted to a gear case (not shown) through
It is transmitted to a tilling nail mounting shaft (not shown) via a chain case 11 via a pipe frame 10 on one side, and
Is driven to rotate. 13 is a top mast, 14 is a toolbar, 15 is a tail wheel adjusting handle, and a tail wheel 14 provided to be suspended from an end of the toolbar 14.
a is adjusted up and down.

Reference numeral 16 denotes a main cover of the rotary. The main cover 16 is formed in an arc shape so as to cover the tilling claw 12 attached to the tilling claw shaft. A pair of left and right roller brackets 22 to which the guide rollers 21 are attached are fixedly provided.

On the other hand, reference numeral 17 denotes a rear cover provided at the rear end of the rotary 8, and an R-shaped plate 17a is detachably provided on the rear side of the rear cover 17 in order to enhance the fineness in tilling. If rice straw or weeds remain in the field, the R-shaped plate 17a can be attached to bury the rice straw or weeds to improve the surface finish. The rear cover 17 is attached to a fulcrum shaft 18,
The lower end of the pressing rod 19 is pivotally connected to a bracket 20 projecting from the upper surface of the rear cover 17 via a pin, and the upper end of the bracket 20 projects from the rear upper surface of the main cover 16.
a, which is slidably supported in the vertical direction, and further connected to a tillage depth detection sensor (a potentiometer that detects the tillage depth based on the swing angle of the rear cover 17) 26. A pair of guide rails 21a, which are curved in an arc shape along the peripheral surface of the main cover 16 and have a substantially zigzag cross section, are fixedly provided, and these guide rails 21a are guide rollers of the roller bracket 22. 2
1 are externally fitted. That is, the rear cover 17
Is movable along an arc about the center of the tilling claw axis and always moves to the deep tilling posture side moved forward (FIG. 1) and the shallow cultivating posture side moved backward (FIG. 2). An appropriate grounding posture can be maintained.

Reference numeral 23 denotes a pressure spring composed of a coil spring wound around the pressure rod 19, and the upper end thereof is a hydraulic cylinder 25 integrated with a stroke sensor 24 described later.
Is provided.

A side panel 27 is provided beside the driver's seat.
The side panel 27 is provided with a pressure adjusting dial 28 for expanding and contracting the hydraulic cylinder 25 based on an operation command described later.

When the rear cover 17 is lowered, the pressure applied to the pressure rod 19 at the time of initial contact with the ground is strong .
Thereafter, after a certain period of time, the pressing force is attenuated and the pressurizing spring 23 is returned to the set pressurized state.

In the above configuration, during the tilling operation, the pressing force adjusting dial 28 is set at a position suitable for the operation condition, so that the stroke sensor 2 provided on the pressure rod 19 is provided.
4, the pressing force of the rear cover 17 is detected, and the hydraulic cylinder 25 can be expanded and contracted to the set pressing force to press the upper end of the spring 23 to change the pressing force. When the rotary 8 is lowered from the raised position and the free end side of the rear cover 17 lands on the cultivated soil mass b during the ground cultivation, the pressure sensor of the rear cover 17 is detected by the stroke sensor 24, and the rear cover 17 is fixed for a certain period of time immediately after the rear cover 17 lands. The pressure of the pressure spring 23 is extended by the hydraulic cylinder 25 to be strongly pressed, and thereafter the pressure of the rear cover 17 returns to the set value.

As described above, it is possible to obtain a pressing force suitable for the working state by hand operation while sitting in the driver's seat, and at the beginning of tilling, that is, immediately after the rear cover 17 lands, the pressing spring 23 applies the pressure to the rear cover 17. Since the pressing force is temporarily forcibly increased and sufficiently acts as a stopper against soil kicking by the tilling claw 12, the tilling of the rotary 8 is started as in the prior art and when the tilling is resumed immediately after the tilling starts. The phenomenon in which the claw 12 jumps through the cultivated soil mass jumped up under the rear cover 17 and kicks out abnormally rearward is eliminated. For this reason, the cultivated soil mass is prevented from rising high on the headlands and four corners of the field, and it is possible to finish cleanly over the entire field, so that it is troublesome to level the raised portion of the headland and the like with the hod after the rotary tilling work. No post-processing is required.

[0014]

[Effect of the Invention] In short, in the present invention, the target swing angle of the rear cover is determined based on the set value of the tillage setting device,
A pressurizing rod with a pressurizing spring wound behind a main cover is provided with an automatic plowing depth control device that controls the working unit to move up and down so that the determined target swinging angle matches the detected swinging angle of the rear cover. In a rotary tilling apparatus in which a rear cover is vertically rotatably mounted via a hydraulic cylinder, the pressure rod is provided with a hydraulic cylinder so as to extend and retract.
When the rotary tilling device descends with respect to the fuselage,
Increase the initial rear cover pressure when the cover is
After a certain period of time, press the rear cover
Since the expansion and contraction operation is controlled so as to weaken the force, it is possible to obtain the pressing force of the rear cover suitable for the field conditions during the tilling work, and to lower the rotary tilling device at the beginning of tilling or when tilling is resumed immediately after recirculation, When the rear cover touches the ground,
Since the rear cover is temporarily in a strongly pressurized state, it is possible to eliminate the phenomenon that the rotary passes under the rear cover and kicks the tillage mass abnormally backward at the beginning of tillage, and the tillage mass rises high in the headlands and four corners of the field Can be prevented, and the entire area of the field can be neatly finished.

[Brief description of the drawings]

FIG. 1 is a side view of a rotary tilling apparatus in a state where a pressing force of a rear cover is increased.

FIG. 2 is a side view of the rotary tillage device in a state where a pressing force of a rear cover is reduced.

FIG. 3 is a plan view of the rotary tillage device.

FIG. 4 is a flowchart for temporarily increasing the pressure of the rear cover.

FIG. 5 is a plan view of a side panel.

[Explanation of symbols]

 Reference Signs List 8 rotary tillage device 16 main cover 17 rear cover 19 pressure rod 23 pressure spring 24 stroke sensor 25 hydraulic cylinder

Claims (1)

(57) [Scope of request for utility model registration] A target swing angle of a rear cover is determined based on a set value of a tillage depth setting device, and a working unit is lifted and lowered so that the determined target swing angle matches a detected swing angle of the rear cover. provided with a tilling depth automatic control device, the rotary cultivator fitted with rear cover to be vertically pivoted via a pressure rod that MekuSo the pressure spring to the rear of the main cover, the hydraulic cylinder to the pressure rod Extension
The hydraulic cylinder is provided so that it can be freely contracted
When the aircraft descends against the aircraft and the rear cover touches the ground
The pressure of the rear cover of the
After the elapse of time, it expands and contracts to reduce the pressure on the rear cover
A rear cover of a rotary tilling device characterized by being controlled .