JPH089704A - Rear cover suspension apparatus of rotary tiller - Google Patents

Abstract

PURPOSE:To provide a rear cover suspension apparatus of a rotary tiller capable of properly changing the soil leveling performance of a rear cover according to the hardness of the tilled soil surface. CONSTITUTION:An end 13b of a coil spring 13 is fixed to a supporting frame and the other end 13a is detachably hooked on a suspension rod 11. The rear cover can be switched between the compression mode to press the rear cover against the field surface and the pulling mode to pull up the cover 7 to the side of the supporting frame by changing the hooking position of the other end 13a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear cover suspension device for a rotary tiller, and more particularly to a rear cover suspension device capable of appropriately changing the leveling performance of the rear cover according to the hardness of the cultivated soil surface. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, in a rotary tiller which is mounted on the rear part of a traveling body so as to be able to move up and down through a three-point link mechanism, a rotary cover 5a for covering the rotary tiller 5 is provided. A rear cover 7 that can be rotated up and down is provided at the rear part, and the tip side of the rear cover 7 is grounded to the field scene during cultivating work, and the vertical movement controls the hydraulic mechanism that moves up and down the rotary cultivator 1 to keep the cultivating depth constant. The rear cover 7 is configured to level the cultivated land while keeping the above.

However, in the above structure, the rod spring 11 for supporting the rear cover 7 is fitted with the coil spring 13a for pressing, and the rear cover 7 is pressed against the field scene by the biasing force of the coil spring 13a, so that a cultivated trail is left. Since the soil is cultivated, when the cultivated soil surface is soft, in combination with the weight of the heavy rear cover 7, the cultivated soil surface cultivated earlier is pressed again by the rear cover 7. There was a problem that. Therefore, in order to solve the above-mentioned problems, the coil spring 1 for pressing is pressed.
Separately from 3a, a coil spring 13b for suspension is mounted at a position higher than the upper support position of the rod 11, and the weight of the rear cover 7 is reduced by urging the suspension upward. Although proposed, in this case, although the compaction of the cultivated soil surface due to the weight of the rear cover 7 can be improved, if the setting of the lifting biasing force to the upper side is incorrect, the rear cover can be used during normal tillage work. 7 jumps up, the leveling operation of the tilling soil surface, which is the original function, is lowered, and as described above, in the structure in which the tilling depth control of the rotary tiller 1 is performed by the vertical movement of the rear cover 7, It has a contradictory drawback that the precision of the control operation is remarkably deteriorated and the plowing work cannot be performed smoothly.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above situation to solve the drawbacks of the prior art, and its object is to have an extremely simple structure, A rotary tiller that can easily and accurately change the leveling performance by the rear cover according to the hardness of the cultivated soil surface without complicated switching operation and can smoothly perform the cultivating work corresponding to the field conditions. In order to provide a rear cover suspension device in.

[0005]

In order to solve the problems, a technical means adopted by the present invention is to provide a rotary tiller under a support frame, and a rear cover for covering the rotary tiller with a support frame. In a rotary cultivator mounted on the rear portion so as to be rotatable up and down, a suspension rod formed by coaxially fitting a coil spring between the upper surface of the rear cover and the rear portion of the support frame rotates around the support frame side. The coil spring is vertically movably mounted as a dynamic fulcrum, one end of the coil spring is fixed to the support frame side, and the other end of the coil spring is detachably attached to a suspension rod, and the coil is attached to the suspension rod. By changing the engagement position of the other end of the spring, it is possible to switch between compression operation that presses the rear cover against the field scene and tension operation that suspends the rear cover on the support frame side. It is characterized in that the configuration was.

[0006]

Therefore, according to the present invention, the pressing force against the soil surface of the rear cover can be switched with one touch in response to the hardness of the cultivated soil surface in the field, and the efficiency of cultivating work and the leveling suitable for each cultivating condition can be achieved. Performance can be easily obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail with reference to an embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a rotary tiller working machine mounted on a rear portion of a traveling body 2 via a three-point link mechanism 3 so as to be able to move up and down. A rotary tiller working machine 1 has a plurality of rotary tillers at a front portion thereof. A rotary tiller 5 provided with claws 4, 4, ... Is laid along the lower surface of a support frame 6 extending in the lateral direction of the machine body,
A rear cover 7 that covers the rotary tillage part 5 is pivotally attached to the rear part of the support frame 6 so as to be vertically rotatable about a connecting metal fitting 8 as a pivot. Also, the rear cover 7
As shown in FIG. 2, the main body 7a of the main body 7a is suspended between a suspension bracket 9 fixed to the upper surface of the rear cover 7 and a support bracket 10 fixed to the rear portion of the support frame 6 via a suspension rod 11. It is supported.

As shown in FIG. 3, the suspension rod 11 is fitted with a coil spring 13 in which an engaging claw 12 is integrally fixed to the other end 13a, and one end 13b of the coil spring 13 is attached to the support bracket 10. The hooking portion 14a of the hooking metal fitting 14 pivotally supported at the tip end is detachably locked, and the lower half portion of the suspension rod 11 has a locking groove 1 at a predetermined interval.
5, 16, 17 and 18 are engraved.

In the above construction, as shown in FIG. 4, when the coil spring 13 fitted to the suspension rod 11 is set to have a free length L with respect to the suspension rod 11, that is, the end 13b and the hook 13 are hooked. In a state where the locking with the metal fitting 14 is released and the other end 13a is not locked in any of the locking grooves 15 to 18, the coil spring 13 moves to the lower half side of the suspension rod 11 by its own weight. Then, the suspension rod 1 between the connecting fitting 8, the suspension bracket 9 and the support bracket 10
1, the rear cover 7 is set in a vertically rotatable state.

When the rear cover 7 is set and the cultivating work by the traveling machine body 2 is started, the rear cover 7 presses the upper part by its own weight from above to perform the leveling of the plowing trace cultivated by the rotary claws 4, 4. By the automatic tillage depth control of the hydraulic mechanism (not shown) that moves up and down according to the unevenness of the field scene and raises and lowers the rotary tiller implement 1, tillage work is performed while keeping the tillage depth constant.

In such cultivating work, one end 13b of the coil spring 13 is attached to the hook portion 14a of the hook metal fitting 14.
When the other end 13a is locked in, for example, the locking groove 15 of the locking grooves 15 to 18, the coil spring 13 changes from the position of the free length L to the compression length L1 (<L). The rear cover 7 is set by the elastic force of the coil spring 13 that is set and generated between the hook metal fitting 14 and the suspension rod 11.
Is strongly pressed toward the surface of the cultivated soil, and the coil spring 13 urges the rear cover 7 downward to perform the cultivating work while leveling the cultivated land on the hard soil surface.

Also, one end 13b of the coil spring 13
When the other end 13a is locked in, for example, the locking groove 17 while the hook is locked to the hooking portion 14a of the hooking metal 14, the coil spring 13 is pulled from the position of the free length L to the pulling length L2 (> L).
The pulling force of the coil spring 13 that suspends the rear cover 7 is generated between the hooking metal fitting 14 and the suspension rod 11 via the suspension rod 11, and the tillable soil of the suspended rear cover 7 is generated. The pressing force on the surface is reduced,
Since the weight of the rear cover 7 is reduced, the cultivating work can be performed while leveling without pressing the cultivated marks on the soft soil surface.

Therefore, in this embodiment, the suspension rod 1
By simply changing the engagement position of the other end 13a of the coil spring 13 with respect to 1, the compression operation of pressing the rear cover 7 against the plowing soil surface and the pulling operation of suspending the rear cover 7 on the support frame 6 side can be performed. Since each can be switched to two stages, the leveling performance by the rear cover 7 can be appropriately selected according to the field conditions, and the plowing work can be performed smoothly and efficiently.

[0014]

In summary, according to the present invention, the rotary tiller is pivotally provided below the support frame, and the rear cover for covering the rotary tiller is attached to the rear portion of the support frame so as to be vertically rotatable. In the tiller,
Between the upper surface of the rear cover and the rear portion of the support frame, a suspension rod formed by coaxially fitting a coil spring is vertically movably mounted with the support frame side as a pivot.
Also, one end of the coil spring is fixed to the support frame side, the other end of the coil spring is detachably engaged with the suspension rod, and the engagement position of the other end of the coil spring with respect to the suspension rod is changed to change the rear cover. Since it is configured to switch between the compression operation for pressing the field cover to the field scene and the pulling operation for suspending the rear cover on the support frame side, the operation setting for pressing the rear cover on the field scene and the support frame are made with a very simple structure. The operation setting for suspending the rear cover on the side can be changed easily and accurately in response to the hardness of the tilling soil by simply changing the engagement position of the other end of the coil spring to the suspension rod with the same one-touch operation. Therefore, it has a very useful new effect that the efficiency of tilling work and the leveling performance suitable for each tilling condition can be easily obtained. .

[Brief description of drawings]

FIG. 1 is an overall side view of a rotary tiller.

FIG. 2 is an enlarged side view of a main part of the same.

FIG. 3A is a partially omitted plan view showing the attachment of a suspension rod and a coil spring. (B) is AA sectional drawing of a principal part same as the above.

FIG. 4 is an enlarged side view of an essential part showing a case where a coil spring is set to a free length.

FIG. 5 is a side view of an essential part showing a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary tiller 5 rotary tiller 6 support frame 7 rear cover 11 suspension rod 13 coil spring 13a other end 13b one end

Claims (1)

[Claims] 1. A rotary tillage working machine comprising a rotary tillage part pivotally provided below a support frame, and a rear cover for covering the rotary tillage part mounted on a rear part of the support frame so as to be rotatable up and down. And a rear portion of the support frame, a suspension rod in which a coil spring is coaxially fitted is vertically movably mounted around the support frame side as a pivot, and one end of the coil spring is attached to the support frame. And the other end of the coil spring is detachably engaged with the suspension rod, and the engagement position of the other end of the coil spring with respect to the suspension rod is changed to press the rear cover against the field. , A rear cover suspension for a rotary tiller, characterized by being configured to switch to a pulling operation in which the rear cover is hung on the support frame side. Rack device.