JP2007006843A - Rotary tiller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary tiller capable of leveling the tilled track by the own weight of a ground leveling member to form a neatly leveled ground. <P>SOLUTION: Arms 31 are connected to both sides of the lower end of a rear cover 22 through a lateral shaft 32, and a ground leveling member 30 is connected to the tip end of the arms through a long hole 31c and a lateral shaft 38. The ground leveling member 30 is dragged by the rear cover 22 on the pressed tilled soil to level the tilled soil by its own weight. In the case of lifting the rotary tiller, the rotation angle of the arm 31 relative to the rear cover 22 is restricted by the first restriction members 31b, 37, the rotation angle of the ground leveling member 30 relative to the arm 31 is restricted by the second restriction members 31d, 39 and the ground leveling member 30 is restricted to a state slantly declined backward. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 (plate) 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 mounted on the rear part of the tractor via a three-point link device, and one of the pair of left and right lift rods can be extended and retracted by a hydraulic cylinder. Is plowed so as to be substantially horizontal at a predetermined plowing depth. The leveling body is connected to the longitudinal axis of the machine so as not to roll, and follows the horizontal control of the rotary tiller to level the tillage, but the horizontal control of the rotary tiller Since there is a limit to its response performance, it is not possible to level the tilling track, especially in cutting work and high speed tilling work where the traveling speed is high.

  A long hole is provided in the mounting bracket for connecting the leveling body (plate) to the rear cover, the leveling body is connected to be movable up and down through the long hole, and the leveling body is placed downward between the mounting bracket and the leveling body. A rotary tiller device has been devised in which a coil spring to be urged is contracted (see Patent Document 1 below). Even when unevenness is generated on the tilling marks by the tilling claws, the leveling body presses against the tilling marks so as to be rotatable in the left-right direction with respect to the rear cover. Within the range, the tillage can be leveled.

JP-A 63-167701

  The leveling body is connected to the elongated hole so as to be movable up and down, and is biased downward by a spring, and the moving range is restricted by a retaining pin, so the movable range is limited, and the unevenness of the field scene If it is severe, it will not be able to follow the tillage marks and will be used in an environment where soil is scattered by tillage claws, so the slot will be clogged with soil, and the smooth movement of the leveling body with respect to the rear cover will be impeded immediately. .

  Further, since the leveling body is attached to the rear cover via a complicated mounting bracket having a coil spring or the like, the mounting is troublesome, and it is not convenient to use as an attachment to be attached or removed depending on the type of work.

  Accordingly, the present invention aims to provide a rotary tiller that solves the above-mentioned problems by leveling the ground leveling body by leveling the tilled soil by its own weight and by regulating the hanging position by the regulating means. It is.

According to the first aspect of the present invention, the rear portion of the tilling claw (16) is covered with a rear cover (22) that is rotatably supported by the rotary cover (21), and the rear cover holds the cultivation soil by the tilling claw. In the rotary tiller that is attached,
A leveling body (30) is rotatably connected to a lower portion of the rear cover (22),
In the working state of the rotary tiller, the leveling body (30) is in a substantially horizontal state dragged on the tilled ground by the rear cover (22), and the tilled ground is caused by the weight of the leveling body. Leveling
When the rotary tiller is raised and the ground leveling body is not in contact with the ground, the leveling body (30) hangs obliquely backward by the regulating means (31b, 37) (31d, 39). The position is restricted to
Located in rotary tiller.

According to a second aspect of the present invention, an arm (31) is connected to a lower portion of the rear cover (22) so as to be rotatable about a first horizontal axis (32), and a second end is connected to a tip of the arm. The leveling body (30) is connected to be rotatable about a horizontal axis (35) of
The restricting means includes a first restricting member (31b, 37) for restricting a rotation angle of the arm (31) with respect to the rear cover (22), and the leveling body (30) with respect to the arm (31). A second restricting member (31d, 39) for restricting the rotation angle.
The rotary tiller according to claim 1.

  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, in the pressing of the rotary cultivated soil by the rear cover, the bottom portion of the rear cover having an arc shape so as to exert a predetermined pressing force on the cultivated crushed soil regardless of the tilling depth. The lower part of the rear cover slides on the crushed soil and the tillage traces may become wavy, but the ground leveling body is dragged on the above tillage traces following the rear cover, so it is leveled by the weight of the leveling body, Even if the soil is in a state of scattering, the performance can be maintained.

  Furthermore, when starting the tilling work by lowering the rotary work machine, the leveling body suspended obliquely rearward at the lower part of the rear cover is grounded prior to the grounding of the rotary. A leveling body that is a heavy load that connects the rear cover with the recess made by rotary tillage can prevent the scattering, can properly level the tilled soil from the beginning, and lift the rotary work machine. Since the tilled ground of the portion accumulated on the rear cover is drawn back and backfilled, the tilled work with a fine finish can be performed from the start to the end of the rotary working machine.

  In addition, when the rotary implement is in the raised position, the leveling body hangs obliquely backward, so when the work implement is lowered to start work, the leveling body is grounded and always rotates backward. Accordingly, the tillage control based on the rotation angle of the rear cover is not hindered, and accurate tillage control can always be performed.

  According to the second aspect of the present invention, since the leveling body is pivotally connected to the arm rotatably supported at the lower portion of the rear cover, it is in a state of being dragged with a high degree of freedom with respect to the rear cover. The leveling body has no influence on the tillage control by the rotation angle of the rear cover, and the leveling body can be reliably and accurately leveled by the weight of the leveling body with a high degree of freedom. Therefore, when the work implement descends, the leveling ground will surely escape backwards, and a highly reliable rotary work implement will be installed. Can be provided.

  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 has two lower links 5 and one top link 6, and the two lower links 5 are connected to the left and right of the tractor body with pins and lift rods. 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 the hitch 11. It is connected. 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 be tiltable in the left-right direction with respect to the tractor by expansion and contraction of the hydraulic cylinder.

  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 is input to the transmission device of the fuselage via the yoke, and the power is transmitted to the tilling 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 rotation of these tilling claws. Further, a tool bar 19 is disposed via an arm 17 extending rearward from the machine body, and the tool bar 19 is adjustable 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. A spring 29 (not shown) is contracted on the rod, and urges the rear cover 22 to be pressed 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 upward protrusion amount of the rod 27, and the detected value is transmitted to the control unit of the tractor by a wire or the like.

  A leveling plate (body) 30 according to the present invention is connected to the lower end of the rear cover 22. The leveling plate 30 is formed of a hollow member 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 generally preferably integrally formed of plastic, and the tillage track is set to a predetermined pressure. A relatively heavy predetermined weight to be pressed. Arms 31, 31 constituting connecting means are arranged across the left and right side surfaces of the leveling plate 30 and the rear cover 22.

  As shown in detail in FIG. 6, the arm 31 has a round hole 31 a and a protrusion 31 b on the rear cover side, and a long hole 31 c and a protrusion 31 d on the leveling plate side. (30 degrees, 60 degrees). The round hole 31a of the arm is fitted to the left and right protruding portions 32a of the (first) horizontal shaft 32 penetrating the entire width of the lower end of the rear cover 22, and is prevented from being removed by the R pin 33 through the washer 34. Has been. A pin (second horizontal axis) 35 protrudes from the left and right side surfaces of the leveling plate 30, and the long hole 31 c of the arm is fitted to the pin and is prevented by the R pin 36 through a washer 38. Has been. Further, stoppers 37 are provided so as to protrude from the left and right side surfaces of the rear cover 22, and the stoppers 37 abut against the protrusions 31 b (first restricting members) to restrict the rotation angle of the arm 31 with respect to the rear cover 22. Further, a stopper 39 is formed to protrude from the left and right side surfaces of the leveling plate 30, and the stopper 39 abuts on the protrusion 31 d (second regulating member), and the rotation angle of the leveling plate 30 with respect to the arm 31 is increased. regulate.

  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 plate 30 is away from the field scene. In this state, the rear cover 22 is in a state of hanging downward, the arm 31 is in a state of being inclined obliquely downward with respect to the rear cover 22 with the protrusion 31b abutting against the stopper 37, and the leveling plate 30 is The stopper 39 is in contact with the protrusion 31 d of the arm 31 and is inclined obliquely downward with respect to the arm 31. Thereby, the leveling plate 30 is positioned and regulated at a position 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 plate 30 is grounded before the tilling claws 16 even in Fukada. At this time, since the leveling plate 30 is inclined obliquely downward, it always rotates backward as the rotary tiller 1 further descends. Then, as shown in FIGS. 4 and 5, when the tilling claw 16 contacts the field scene and jumps the soil backward, the leveling plate 30 is grounded even if the rear cover 22 is not grounded. The soil bounced back is not scattered backwards.

  As shown in FIGS. 1 and 3, the rotary tiller 1 is lowered until reaching a preset tillage depth, and a tilling operation is performed by running 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 rolls in the left-right 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 plate 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. Although there is a wave-like unevenness (referred to as "sasare") S, the leveling board 30 leveles out evenly by pressing the tilling trace with its own weight.

  Further, due to a response delay of the above-described tillage control and horizontal control, or due to unevenness of tillage in a state where these controls are cut off, the tillage depth may change or the rotary tiller 1 may roll left and right with respect to the field scene. . Since the leveling board 30 is connected with a high degree of freedom to the change in the plowing depth via the arm 31, the leveling board 30 presses the plowing trace by its own weight against a slight change in the plowing depth. Therefore, it is leveled evenly. Even if the tilling device 1 rolls left and right, the leveling plate 30 is connected via the long holes 31c of the arm 31 at the left and right ends thereof, so that the leveling plate 30 is connected regardless of the rolling of the rear cover 22. , Press the tillage track with its own weight and level it evenly.

  Combined with this, the tilling trace by the rotary tiller 1 is leveled by the leveling plate 30 and a tilled farming scene with a good finish can be obtained. When the rotary tiller 1 is lifted after one step of the tilling work is completed, the leveling plate 30 is suspended until the angle is regulated by the stoppers 37 and 39 after the rear cover 22 is separated from the field scene. It is done. As a result, the portion of the tilled soil that has accumulated on the rear cover 22 is drawn back by the ground leveling plate 30 and backfilled, resulting in a beautiful tillage. In turnover work that does not require the leveling plate 30, the R pin 33 is removed and the leveling plate 30 is removed from the rear cover 22 together with the arm 31. it can.

The side view which shows the tilling work state of the rotary tiller which has the leveling body which concerns on this invention. The rear view of a rotary tillage apparatus. The enlarged side view which shows the rear cover and leveling body part in a cultivation work state. The side view which shows the rotary tillage apparatus at the time of tilling work start. The enlarged side view which shows a rear cover and a leveling body part at the time of a cultivation work start. It is an enlarged view which shows a leveling body part, (a) is a side view, (b) is a top view.

Explanation of symbols

1 rotary tiller 2 traveling machine (tractor)
16 Tillage Claw 21 Rotary Cover 22 Rear Cover 30 Leveling Body 31c Long Hole 32 First Horizontal Axis 35 Second Horizontal Axis 31b, 37 First Restriction Member 31d, 39 Second Restriction Member

Claims (2)

In the rotary tilling device, the rear portion of the tilling claw is covered with a rear cover that is rotatably supported by a rotary cover, and the rear cover presses the cultivation soil by the tilling claws.
A leveling body is rotatably connected to the lower part of the rear cover,
In the working state of the rotary tiller, the leveling body is in a substantially horizontal state dragged by the rear cover on the tilled ground, and leveling of the tilled ground by the weight of the leveling body,
In the state where the rotary tiller is raised and the ground leveling body is not in contact with the ground, the leveling body is regulated by the regulating means so as to hang obliquely backward,
Rotary tillage device. An arm is connected to the lower portion of the rear cover so as to be rotatable about a first horizontal axis, and the ground leveling body is connected to a tip portion of the arm so as to be rotatable about a second horizontal axis.
The restricting means includes a first restricting member that restricts a rotation angle of the arm with respect to the rear cover, and a second restricting member that restricts a rotation angle of the leveling body with respect to the arm. Become,
The rotary tiller according to claim 1.

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