JP4847155B2 - Rotary tillage device - Google Patents

Description

  The present invention relates to a rotary tiller that is mounted on a traveling machine such as a tractor and cultivates a farm field, and more particularly to a leveling body that is connected to a rear cover that covers a rear portion of a tiller claw and leveles a farm scene.

  2. Description of the Related Art Conventionally, there is known a rotary tiller device in which a leveling body is connected to a rear cover that covers the rear of a tilling claw so as to be rotatable by a horizontal axis. The rotary tiller is attached to the rear part of the tractor via a three-point link device, and the left and right lift arms are configured to be movable up and down by hydraulic cylinders. It can be cultivated to be level. Further, the tilled ground is pressed by the rear part of the rear cover and is also pressed by the leveling body, and the soil after tilling is leveled to create a field scene suitable for rice planting.

JP 2003-51604 A

  Since the leveling body is pivotally attached to the rear cover via an arm, when the leveling body comes into contact with a large crushed soil mass, the ground leveling body and the rear cover will be pushed up without being fully pressed. May interfere. The ground leveling body that has been flipped up tilts toward the rear cover, so it cannot return to the position where it comes into contact with the original field scene due to natural forces. It was necessary to return.

  Furthermore, when moving on uneven roads or farm fields with the tractor lifting the rear of the rotary tiller, the leveling body may be flipped up by vibrations. It was necessary to return the leveling body to the position in contact with the field scene.

  Accordingly, the present invention provides an upper rotation position that is a position on the side where the leveling body has jumped up by the first and second regulating means that regulate the rotation of the leveling body coupled to the rear cover, It is an object of the present invention to provide a rotary tiller that solves the above-mentioned problems by regulating a downward rotation position that is a position on the side in contact with the rear cover and restricting the rotation of the leveling body relative to the rear cover. is there.

According to the first aspect of the present invention, the rear portion of the tilling claw (16) is covered with a rear cover (22) rotatably supported by the rotary cover (21), and an arm (31) is provided below the rear cover (22). In the rotary tilling device (1) formed by pressing the tilled ground by the leveling body (30) supported rotatably via the
First restricting means (31b, 31e, 37) for restricting upward and downward rotation of the arm (31) relative to the rear cover (22);
Second regulating means (31d, 31f, 39) for regulating the upward and downward rotation of the leveling body (30) relative to the arm (31),
The leveling body (30) is defined as a downward rotation position with respect to the rear cover (22) and an upper rotation position with respect to the rear cover (22).
The rotary tiller (1) is characterized in that.

According to a second aspect of the present invention, in the state where the ground leveling body (30) is defined in an upward rotation position with respect to the rear cover (22), the center of gravity (30G) of the leveling body is the rear cover of the arm. Is located behind the vertical line passing through the center of rotation,
It exists in the rotary tillage apparatus (1) of Claim 1.

According to the third aspect of the present invention, at the left and right ends of the leveling body (30), the bottom surface is flush with the leveling bottom surface (30a) of the leveling body during expansion, and the bottom surface can be stored above the leveling body during storage. An extended leveling body (40) is provided,
The extended leveling body (40) in the retracted position is disposed at a position where it does not interfere with the rear cover (22) in a state where the leveling body (30) is defined as the upward rotation position.
It exists in the rotary tillage apparatus of Claim 1 or 2.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on description of a claim by this.

  According to the first aspect of the present invention, the arm supported rotatably on the rear cover is restricted from turning in the upward and downward directions by the first control means, and further, the ground leveling supported rotatably on the arm. Since the body is restricted from rotating in the upward and downward directions by the second control means, the leveling body can define the upper rotation position relative to the rear cover and can define the lower rotation position. Even if it is swung up by turning over a large crushed soil, it does not interfere with the rear cover.

  Further, when the leveling body is lifted up by the vibration due to the unevenness of the road surface when the rotary work machine is lifted and travels on the road or the like, the leveling body defines the upward rotation position with respect to the rear cover. In addition, since the downward rotation position is defined, the leveling body does not interfere with the rear cover.

  According to the second aspect of the present invention, the center of gravity of the leveling body defined in the upward rotation position is located rearward from a vertical line passing through the rotation center of the arm relative to the rear cover and the rotation center of the leveling body relative to the arm. Therefore, the leveling body that is flipped up and is in the upward rotation position can be rotated in the direction of the downward rotation position by its own weight, and the leveling body can always be held in contact with the field scene. .

  According to the third aspect of the present invention, since the extended leveling body is provided at the left and right ends of the leveling body, even if the crushed soil protrudes from the side of the rear cover by pressing the rear cover, It is possible to create a flat and beautiful field scene. In addition, since the extended leveling body can be stored above the leveling body, it can be moved after the tilling operation is completed without increasing the lateral width of the rotary tilling device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the rotary tiller 1 is attached to the rear of a tractor (traveling machine body) 2 via a three-point link device 3. The three-point link device 3 includes two lower links 5 and one top link 6, and the two lower links 5 are connected to the rear left and right of the tractor body 2 by pins. The lift arm 7 is connected via a lift rod 7. The top link 6 is connected to a bracket 10 provided at the rear center of the tractor body, and the rotary side of the lower link and the top link is connected to a hitch 11. One of the left and right lift rods 7 is provided with a hydraulic cylinder (not shown), and the rotary tiller 1 is controlled to swing in the left and right directions with respect to the tractor 2 by expansion and contraction of the hydraulic cylinder. Yes.

  The rotary tiller 1 has a tiller body 12 including a top mast, a transmission case, and the like, and the body is attached to the hitch 11. An output from the PTO shaft of the tractor body 2 is input to the transmission device of the body via a yoke, and the power is transmitted to the tillage shaft 15 via the chain in the chain case 13. A number of tilling claws 16 are attached to the tilling shaft 15, and rotary tilling is performed by the rotation of the tilling claws 16. A tool bar 19 is disposed via an arm 17 extending rearward from the machine body 12, and the tool bar 19 can be adjusted in height by a handle 20.

  A rotary cover 21 is disposed on the tiller body 12 so as to cover the top of the tillage claws 16 so as to be adjustable in the front-rear direction. A rear cover 22 is disposed laterally (in the left-right direction of the body) at the rear of the rotary cover 21. A side cover 23 is attached to the rotary cover 21 so as to cover both sides of the tilling claw 16 while being supported rotatably about an extending shaft 24. In addition, brackets 25 and 26 are respectively fixed to the left and right two locations on the outside of the rotary cover 21 and the rear cover 22, and a rod 27 is slidably disposed on the upper bracket 25 while being pivotally supported by the lower bracket 26. The rod is provided with a spring (not shown) which is urged so as to press the rear cover 22 downward, that is, toward the field. Further, the amount of rotation of the rear cover 22 relative to the rotary cover 21 is detected by detecting the amount of upward protrusion of the rod 27, and the detected value is transmitted to the control unit of the tractor 2 by a wire or the like.

  A leveling body 30 is connected to the lower end of the rear cover 22. The leveling body 30 is formed by hollowing a steel material having a predetermined thickness that is substantially the same width as the rear cover 22 and is thicker than the thickness of the rear cover 22, and is relatively heavy to press the cultivated crushed soil under its own pressure. Have weight. The leveling body 30 is connected to the left and right side surfaces of the rear cover 22 via arms 31, 31.

  As shown in detail in FIG. 3, the arm 31 has a round hole 31a and a protrusion 31b on the rear cover side, and has a long hole 31c, a protrusion 31d, and a protrusion 31f on the leveling plate side. As a whole, the oblique edge 31e connecting 31f has a substantially triangular shape in side view. The round hole 31 a of the arm 31 is fitted with a (first) horizontal shaft 32 provided on the left and right sides of the lower end of the rear cover 22. Pins (second horizontal axis) 35 project from the left and right side surfaces of the leveling body 30, and a long hole 31 c of the arm 31 is fitted to the pin so as to be rotatable via a washer 38. ing.

  Further, stoppers 37 project from the left and right side surfaces of the rear cover 22, and the stoppers 37 abut against the protrusions 31b when the arm 31 is rotated downward (see FIG. 4), and the arm 31 rotates upward. In the moved position, the first abutment means is configured to abut against the oblique edge 31e (see FIG. 3) and restrict the upward and downward rotation of the arm 31 relative to the rear cover 22.

  Similarly, stoppers 39 project from the left and right side surfaces of the leveling body 30, and the stoppers 39 abut against the protrusions 31 d at the position where the leveling body 30 rotates downward (see FIG. 4). In the position in which the arm is pivoted upward, it abuts against the protrusion 31f (see FIG. 3) and constitutes a second regulating means for regulating the upward and downward pivoting of the leveling body 30 relative to the arm 31.

  Further, as shown in FIGS. 2 and 3, extended leveling bodies 40 that extend the leveling width of the leveling body are foldably attached to the left and right ends of the leveling body 30. The extended leveling body 40 has a leveling piece 44 that extends from the left and right ends of the leveling body 30 at the time of leveling, and is flush with the leveling bottom surface 30a of the leveling body 30 to widen the leveling width of the tillage surface. In the leveling piece 44, a support 42 fixed to the upper surface side and a pedestal 41 fixed to the leveling body 30 are connected to each other by connecting pins 43 and 43 and an urging spring 45 so as to be swingable.

  Next, the operation of the rotary tiller 1 will be described. In the non-working state, the lift arm 9 of the tractor 2 is in a state of rotating upward, and the rotary tiller 1 is at an upper position where the leveling body 30 is away from the field scene (see FIG. 5). In this state, as shown in FIG. 4, the rear cover 22 is in a state of hanging downward, and the arm 31 is inclined obliquely downward with respect to the rear cover 22 with its projection 31b abutting against the stopper 37, that is, In the position where the downward rotation is restricted by the first restricting means. Further, the leveling body 30 is in a state in which the stopper 39 abuts against the protrusion 31d of the arm 31 and is inclined obliquely downward with respect to the arm 31, that is, in a position where the downward rotation is restricted by the second restricting means. is there. Accordingly, the leveling body 30 defines a downward rotation position that is inclined obliquely downward with a steep slope with respect to the rear cover 22.

  From this state, when the tilling claws 16 are rotated and the rotary tiller 1 is lowered to perform the tilling (including scraping) work, the ground leveling body 30 is grounded before the tilling claws 16 even in Fukada. At this time, since the leveling body 30 is inclined obliquely downward, it always rotates backward as the rotary tiller 1 further descends. Then, when the tilling claw 16 touches the field scene and jumps the soil backward, even if the rear cover 22 is not grounded, the leveling body 30 is grounded before the rear cover 22 and therefore jumps backward. The blown soil will not be scattered backwards.

  Next, as shown in FIG. 1, the rotary tiller 1 descends until reaching a preset tillage depth, and the tiller advances by traveling in the field together with the tractor 2. In the plowing work, even if the plowing depth changes due to the unevenness of the cultivator on which the tractor 2 travels, the lift arm 9 It moves up and down and is controlled so that the plowing depth becomes constant (plowing depth control). Further, even if the tractor 2 is tilted in the front-rear direction due to the unevenness of the tiller, etc., one hydraulic cylinder of the lift rod 7 is expanded and contracted based on the signal from the tilt sensor to control the rotary tiller to be in a horizontal state. (Horizontal control).

  The lump that has been crushed by the tilling claws 16 and spun up is brought into contact with the rear cover 22 and is pressed by the arc-shaped portion 22a of the rear cover in an inflated state. At this time, even if the soil block from the tilling claw 16 blows out from the lower surface of the rear cover 22, the leveling body 30 presses the blown soil block by its own weight. Further, the arc-shaped portion 22a of the rear cover slides on the tilling trace, and the restoring force of the loosened soil mass by the waste straw stirred by the tilling claws 16 combined with the rear cover 22 alone causes the tilling trace. The ground leveling body 30 is leveled by pressing the tilling trace with its own weight, although it may be uneven in a wavy shape (referred to as sasare).

  Further, the crushed soil pressed by the arc-shaped portion 22 a and protruding from the side cover 23 to the side of the rear cover 22 is leveled by the extended leveling bodies 40 attached to both ends of the leveling body 30. The flat end is beautifully finished.

  In addition, during the cultivation work, rarely the cultivated crushed soil may reach the leveling body 30 in the state of a large lump, but such a crushed earth lump cannot be pressed by the own weight of the leveling body 30, so as shown in FIG. Further, the leveling body 30 is flipped upward with respect to the rear cover 22. In the state in which the leveling body 30 is flipped up, the arm 31 has a slanted edge 31e in contact with the stopper 37 and is inclined obliquely upward with respect to the rear cover 22, that is, in the upward direction by the first restricting means. In addition to restricting the upper rotation of the arm 31, the leveling body 30 is in a position inclined obliquely upward with respect to the arm 31, that is, the stopper 39 is in contact with the protrusion 31f. The upward rotation of the leveling body 30 is restricted by the second restricting means. As a result, the leveling body 30 defines an upward rotation position inclined upward with respect to the rear cover 22.

  Similarly, when the tractor 2 lifts the rear portion of the rotary tiller 1 and travels on the road or the like, the leveling body 30 may be flipped up due to the unevenness of the road surface (see FIG. 5). In the same way as the raised state, the rotation restriction of the arm 31 with respect to the rear cover 22 and the rotation restriction of the leveling body 30 with respect to the arm 31 act, and the rotation angle of the leveling body 30 can be restricted. The body 40 can be fixed at a position where it does not interfere with the rear cover 22 (upward rotation position).

  In the leveling body 30 that is in the upward rotation position due to the jumping state, the gravity center 30G of the leveling body 30 is located behind the vertical line passing through the rotation center of the first horizontal shaft 32. 4 can return to the downward rotation position shown in FIG. 4, and the leveling body 30 always maintains a state where the farm scene can be leveled. Further, if the center of gravity 30G is located behind a moving line 30L that is a line connecting the rotation center of the first horizontal axis 32 and the rotation center of the second horizontal axis 35, the center of gravity 30G can be rotated more quickly. It can return to the moving position.

The side view which shows the tilling work state of the rotary tiller which concerns on this invention. The top view of the rotary tillage apparatus which concerns on this invention. The enlarged side view which shows the leveling body part in an upward rotation position. The enlarged side view which shows the leveling body part in a downward rotation position. Side view of the rotary tiller in the running state

Explanation of symbols

1 rotary tiller 2 traveling machine (tractor)
16 Tillage Claw 21 Rotary Cover 22 Rear Cover 30 Leveling Body 30G Center of Gravity 30L Movement Line 31 Arm 31b Projection 31d, 31f Projection 31e Slope Edge 32 First Horizontal Axis 35 Second Horizontal Axis 37, 39 Stopper 40 Extended Leveling Body

Claims (3)

Rotary tillage where the rear part of the tilling claws is covered with a rear cover that is rotatably supported by a rotary cover, and the ground for cultivation is pressed against the bottom of the rear cover by means of a leveling body that is rotatably supported by an arm. In the device
First restricting means for restricting upward and downward rotation of the arm with respect to the rear cover;
A second restricting means for restricting the upward and downward rotation of the leveling body relative to the arm,
The leveling body is defined with a downward rotation position with respect to the rear cover, and with an upward rotation position with respect to the rear cover.
A rotary tiller characterized by that. In a state where the leveling body is defined as an upward rotation position with respect to the rear cover, the center of gravity of the leveling body is located behind a vertical line passing through the rotation center of the arm with respect to the rear cover.
The rotary tiller according to claim 1. At the left and right ends of the leveling body, an extended leveling body that can be stored above the leveling body is provided when the expansion is extended, and the bottom surface is flush with the leveling bottom surface of the leveling body.
In the state where the leveling body is defined as the upward rotation position, the extended leveling body in the storage position is disposed at a position where it does not interfere with the rear cover.
The rotary tiller according to claim 1 or 2.

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