JPH0453481B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a disc-type rotary tiller that is connected to the rear of a tractor, for example, through a three-point support linkage mechanism so as to be movable up and down, and performs a tilling action. In particular, the present invention relates to a disc-type rotary tiller in which a disc is rotationally driven by power transmitted from a PTO shaft of a tractor.

[Conventional technology]

Conventionally, the disc-type rotary tiller of the type that forcibly drives the disc plow as described above has been known for a long time as described in British Patent No. 857923, and has recently been put into practical use in Japan. The method described in Publication No. 57-54201 has been proposed.

This type of tillage device has disc rotors that extend in the left and right directions and are configured symmetrically with a central transmission case as a border. In addition to being rotatably supported in an adjustable manner, the left and right disc rotors are forcibly driven to rotate by power transmission from the tractor PTO shaft via a universal joint and transmission shaft. By arranging them so that they face inward or outward from each other, the soil is tilled and turned into a high ridge shape or a broken ridge shape.

[Technical problem of the invention]

By the way, in the above-mentioned tillage device, when the disk plows of the left and right disk rotors are installed so that the curved concave surfaces face inward to each other and plow the soil in a high ridge shape, the disk plows at the inner ends of the left and right disk rotors Since it is necessary to leave the required distance between the disks, it is necessary to dig up the middle section of cultivated soil in advance in the center between the left and right disks on the inner edge side. There is a problem in that the soil mass to be tilled and turned over overlaps the uncultivated soil in the central part, and the central part becomes locally high and uncultivated land (remaining plowing) occurs in the central part.

As a means to solve this problem, conventionally, in a center drive type disc rotary tiller, a transmission case that receives power from a central transmission case is protruded in front of the inner ends of the left and right disc rotors. It is known to have a central tilling shaft protruding from the left and right sides, perpendicular to the direction of movement of the machine and rotating in the up-cutting direction, and a hatchet claw with the horizontal blade bent outwards attached to this shaft. . In this method, the soil plowed with the machete claws and the straw sticks scattered on the field surface are scattered in the direction of movement of the machine, that is, towards the tractor, so it has the disadvantage that it is difficult to make a sufficient opening in the center. Not only that, but there were also other problems, such as the straw rod etc. being wrapped around the central tilling shaft, uncultivated land (residue) remaining below the transmission case, and the overall length of the machine becoming longer and heavier.

Therefore, the present applicant first placed a pair of driven or self-rotating left and right central disks in front of the inner ends of the left and right disk rotors, with their curved concave surfaces facing outward and circumferentially relative to the direction of travel. We proposed a system in which the front parts are pivoted in a V-shape so that they are close to each other, but with this method, the soil divided in the middle by the central disk is only flipped left and right, and the divided soil mass is Because the inner disk of the disk rotor returns to the center and overlaps, the problem of the center becoming locally high still remains unresolved. Since a chisel or the like must be installed to handle plowing, traction resistance increases, and there are also problems such as difficulty in adjusting the plowing depth in the center.

[Purpose of the invention]

In order to solve the above-mentioned problems, the present invention improves the central tillage processing device disposed in front of the center of the left and right disc rotors. Large soil clods can be plowed in such a way that they are alternately and vigorously distributed diagonally forward to the left and right, and an opening can be formed in the center of the cultivated soil, and the plowed soil can be evenly distributed in front of the left and right disc rotors. It is possible to turn over and plow evenly without causing the tillage scars to become locally uneven due to distributed scattering, and there is no need for a chisel for processing residual tillage, reducing traction resistance, and the overall length of the entire device can be shortened. It is an object of the present invention to provide a disc-type rotary tiller which is improved so that the tillage depth in the central part can be adjusted relatively easily.

[Technical means of invention]

In order to achieve this object, the present invention has a mission case in the center of the device, and a set of left and right disks is constructed by attaching a plurality of disks to a rotating shaft at a predetermined pitch on both left and right sides using this mission case as a base body. Disc rotors are disposed with a predetermined gearing angle, and each of the left and right disc rotors is configured to be rotationally driven from the transmission case via a power transmission system. At the front of the inner end, a pair of left and right central tilling shafts that rotate in the up cut direction via a transmission case that receives power from the respective disk rotation shafts are installed. A plurality of central tilling blades are arranged on the left and right central tilling axes so that the tip rotation trajectories of the tilling blades overlap, and The present invention is characterized in that it is mounted so as to rotate crosswise so as not to cause residual plowing, and that the mounting angle of the transmission case with respect to the disk rotation shaft can be changed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The figure shows a disc-type rotary tiller that is attached to the rear of a tractor. An input shaft 11 protrudes from the input shaft 11, which is transmission-coupled to a PTO shaft 13 mounted at the rear of the tractor A through a drive shaft 12, as seen in well-known tractor-mounted agricultural machines. It is designed to receive power transmission. Furthermore, the transmission case 1 has a strut 21 erected at its front end, and has a top link 22 connected to the top of the strut 21, and two lower links 23 on the left and right connected to both sides of the lower part. A transmission case 1 is connected to the rear part of a tractor A so as to be movable up and down through a three-point support link mechanism 2.

Disc rotors 3, 3 are arranged on both left and right sides of the transmission case 1 at the center. The left and right disc rotors 3 are constructed by attaching a plurality of disc plows 32 (two in the embodiment shown in the drawings) at a predetermined pitch to a horizontally supported rotor shaft 31, respectively. The disc plows 32 in the rotor are mounted symmetrically so that their curved concave surfaces face inward, and the left and right disc rotors 3 each have a gate shape and are attached to a rotor frame 33 that also serves as a transmission frame. Therefore, the rotor shaft 31 is pivotally supported between the left and right vertical portions of the rotor frame 33 so as to form an independent framework. In the left and right rotor frames 33, a bracket 34 provided at the upper part of each inner end side is pivoted by a vertical pin 36 to a bracket 35 fixed to the transmission case 1, and the left and right rotor frames 33 are rotated around the vertical pin 36 as a fulcrum. Each rotor frame 33 is rotatable back and forth in a horizontal plane,
Thereby, the gearing angle of the left and right disk rotors 3, 3 can be adjusted.

The gearing angle adjustment mechanism 4 for adjusting the gearing angle is a threaded rod having a rotating handle 42 on the tractor A side at the upper end of a pair of left and right support frames 41 erected upward from the front end of the strut 21. 43 is rotatably supported, and a threaded cylinder 44 that is screwed into this threaded rod 43 extends rearward.
The rear end of the strut 21 is pivoted at the rear end pivot position of the strut 21 to the upper end of a swinging rod 46 which is rotatably supported in the front and back direction by a pivot shaft 45, and the lower end of the swinging rod 46 is The rear end portions of swing arms 47, 47 projecting rearward from the rotor frame 33 below the vertical pin 36 are pivotally connected via link bodies 48, 48 on both sides. Then, by rotating the rotating handle 42, the screw rod 43 is rotated,
As the threaded cylinder 44 moves forward or backward, the swinging rod 46 swings back and forth around the pivot shaft 45, and moves the swinging arm 47 back and forth via the link body 48, causing the disc rotor 3 to move forward or backward. , 3 can be adjusted.

The transmission case 1 has output shafts 14, 14 that protrude in the left and right direction, and both output shafts 14, 1
A power transmission shaft 16 connected to the rotor frame 33 via a universal joint 15
The inner side extends laterally, and the other end is transmission connected to a side transmission system in a transmission case 37 formed on the outer end side of the rotor frame 33, and both disc rotors 3, 3 are connected to each other via this side transmission system. rotor shaft 3
Rotational power is transmitted to 1. The power transmission shaft 16 has a structure in which the shaft portion is extendable and retractable, and the disc rotor 3 is driven to rotate at a high speed (approximately 3.5 times or more faster) than the traveling speed of the tractor.

Further, one ends of link rods 38, 38 are pivotally attached to both left and right sides of the rear end of the transmission case 1, and the other ends extend substantially parallel to the rotor frame 33 and extend rearward from the rear of the transmission case 37. The link rod 38 and the pivot point of the transmission case 37 of the support arm 39 and the vertical pin 36 form a parallel link. There is. Support arm 3
A column 51 that pivotally supports a gauge wheel 5 is attached to the rear end of 9, 39 so that its position can be adjusted up and down, and by adjusting the gauge wheel 5 up and down, the tilling depth by the disc rotor 3 can be regulated. It is set as. And the gauge wheel 5 is
It is designed to rotate around an axis perpendicular to the direction of travel, almost unaffected by the gearing angle adjustment of the left and right disc rotors 3, 3.

Further, a safety cover 6 is provided above the outer part of the rotor frame 33, and this safety cover covers the upper part of the disc plow 32 and also covers the mounting tool 61.
Although not shown, the scraper of the disc plow 32, the tilled soil reversing plate, etc. are removably installed on this fixture 61.

A central tillage processing mechanism 7 is provided at the center front side of the inner end sides of the left and right disc rotors 3, 3 configured as described above. This central tillage processing mechanism 7 has a plurality of mounting holes 71a and bolt nuts 71b in the rotor frame 33 facing forward and slightly downward at the inner shaft ends of the left and right rotor shafts 31, 31, respectively.
A transmission case 71 is protrudingly supported through the transmission case 71 so that the mounting angle can be changed, and a pair of central tilling shafts 72 each rotate inwardly from the respective tips of the left and right transmission cases 71 in an upward cut direction. Each of the left and right central tilling shafts 72, 72 is parallel to the rotor shaft 31, and is supported so as to protrude from the center line in the width direction of the left and right disc rotors 3, 3 in a V-shape in plan view. A propeller-shaped central tilling blade 73 is attached to the. The central tilling shaft 72
In this embodiment, the rotor shaft 31 rotates at 110 rpm, whereas it rotates faster at 165 rpm (about 1.5 times).
The speed has been increased so that it rotates at Further, the central tilling blade 73 has a semicircular tilling blade (blade body) 73 on its boss portion 73a, which is wider at the tip end than at the base end.
The boss portion 73a (central tilling shaft 72
It is fixed in a cross-curved manner diagonally with respect to the axis of the

Further, the central tilling blades 73, 73 attached to the left and right central tilling shafts 72, 72 are attached to the respective central tilling shafts 72, 72, as shown in FIGS. 3 and 4.
72, the two tilling blades 73b are shifted in phase by 180 degrees in the rotation direction, and the relationship between the left and right central tilling blades 73, 73 is such that the rotation loci of the tips of the tilling blades 73b overlap with each other. It is attached to each central tilling shaft 72, 72 so as to cross-rotate to prevent residual tillage.

In the tilling device configured in this way, when the tractor A is moved forward to perform tilling work, the
The left and right disc rotors 3, 3 are driven to rotate at a higher speed than the moving speed of the tractor by the power transmitted from the PTO shaft 13 through the drive shaft 12, and the discs of each rotor 3, 3 driven to rotate are driven to rotate at a higher speed than the moving speed of the tractor. 32, the soil is tilled inward towards each other,
The tillage is reversed and plowed into a high ridge shape (scythe-shaped). Prior to this reversal of tillage by the left and right disc rotors 3, 3, as shown in FIG. The blade 73 rotates in the cutting direction at a higher speed than the disc rotor shaft 31 and cuts into the uncultivated land in front of the intermediate part of both disc rotors 3, 3, so that the soil in the central part is compared. A large lump of soil is plowed in alternating slices diagonally forward to the left and right, and an opening is created in the center of the cultivated soil.

At this time, the pair of central tilling blades 73, 73 rotate in an intersecting manner so that the rotation trajectories of the tips of the left and right tilling blades 73b overlap, and are formed in a semicircular shape with a wide width from the base end to the tip side. In addition, since the inner end side of the boss portion 73a is obliquely arranged so as to face forward in the direction of rotation, and is curved like a propeller, each of the central tilling blades 73, 73 can cut the tilled soil without hitting the back. By plowing the soil in such a way as to alternately throw the soil diagonally forward to the left and right, there is no residual tillage left in the center of the cultivated soil, and the center of the cultivated soil is plowed in half to ensure that the soil is plowed in half. An opening can be formed, and the subsequent plowing and inversion of the soil mass by the inner disc plow 32 is backfilled toward this central opening, so that the central area can be leveled without causing any local unevenness. cultivated.

The gearing angle of the disc rotors 3, 3 is adjusted depending on the condition of the soil to be tilled. is facing backward and the gearing angle adjustment mechanism 4
The gearing angle can be changed by rotating the rotating handle 42, or the gearing angle can be easily adjusted by raising the tilling device via the three-point link support mechanism 2 and rotating the rotating handle 42. can be done. The adjustment angle of this gearing angle is usually about 22 to 32 degrees.
This is not carried out over a very large range, and the adjustment of the Guyang angle has almost no effect on the central tillage processing mechanism 7.

Furthermore, a disc plow 32 or a tilling blade 7
3b becomes worn and the plowing depth becomes uneven, the mounting angle of the transmission case 71 relative to the rotor shaft 31 can be changed by removing the bolt/nut 71b, selecting the mounting hole 71a, and tightening the bolt/nut 71b. The tilling depth of the tilling blades 73b is adjusted, and the tilling work can be made uniform.

〔Effect of the invention〕

Thus, according to the present invention, the entire cultivated soil can be disc-cultivated without leaving any uncultivated land (remaining tillage) between the left and right disc rotors. A pair of left and right central tilling shafts, which rotate in the up-cut direction via a transmission case that receives power from the disk rotation shaft, are placed on the front side of the unit, parallel to the disk rotation axis, and at a height in plan view relative to the center line in the width direction of the left and right disk rotors. A plurality of central tilling blades are attached to the left and right central tilling shafts so that the tip rotation trajectories of the tilling blades overlap and intersect with each other. Since the configuration is such that the mounting angle with respect to the rotating shaft can be changed, the following effects can be obtained.

The left and right central tilling blades alternately distribute the soil in the center of the cultivated soil to the left and right diagonally forward, and the soil in the center is , it is possible to reliably dig left and right, and also to form an opening of a predetermined width in the center of the cultivated soil by distributing the cultivated soil almost uniformly over the entire area in front of the disc rotor and leaving no residual tillage. Plowing and turning using a disc rotor can be done evenly without causing localized areas.

In addition, the soil clods that are divided into sections are relatively large and are plowed alternately to the left and right diagonally forward, so the aggregate structure in the tillage remains is maintained, which may impede the effectiveness of disk tillage. There is no.

Furthermore, as mentioned above, since the central tillage blade body cross-rotates and no residual tillage remains, there is no need to provide a chisel or the like for residual tillage processing between the left and right central tillage processing mechanisms, and the structure can be configured by omitting this. can be simplified and traction resistance can be reduced.

Furthermore, since the mounting angle of the transmission case with respect to the disc rotation shaft can be changed, the tilling depth of the central tilling blade can be adjusted as desired, and it can be adapted to the tilling depth of the disc rotor, allowing highly accurate tilling work. Excellent effects can be obtained.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the disc-type rotary tiller according to the present invention, in which Fig. 1 is a perspective view seen from the rear, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of the main part, and Fig. 4 is a perspective view of the same. It is an action explanatory diagram. 1...Mission case, 11...Input shaft, 1
2... Drive shaft, 13... PTO axis, 1
4... Output shaft, 15... Universal joint, 16... Power transmission shaft, 2... Three-point support link mechanism, 21... Strut, 22... Top link, 23... Lower link, 3... Disk Rotor, 31... Rotor shaft, 32... Disk plow, 33... Rotor frame, 34, 35... Bracket, 36... Vertical pin, 37... Transmission case, 38... Link rod, 39... Support arm , 4...
Guyang angle adjustment mechanism, 41... Support frame, 42...
Rotating handle, 43...screw rod, 44...screw cylinder, 45...pivot shaft, 46...swinging rod, 47...
Swing arm, 48... Link body, 5... Gauge wheel, 51... Support column, 6... Safety cover, 61
... Attachment, 7 ... Central tillage processing mechanism, 71 ...
Transmission case, 71a...Mounting hole, 71b...Bolt nut, 72...Central tilling shaft, 73...Central tilling blade, 73a...Boss part, 73b...Cultivating blade (blade body), A...Tractor.

Claims (1)

[Claims] 1. The device has a transmission case in the center, and a pair of left and right disk rotors, each consisting of a plurality of disks attached to a rotating shaft at a predetermined pitch, have a predetermined gearing angle on both the left and right sides, using the mission case as a base. The left and right disk rotors are arranged to rotate from the transmission case via a power transmission system, and each disk rotor is provided at the front of each inner end of the left and right disk rotors. A pair of left and right central tilling shafts that rotate in the up-cut direction via a transmission case that receives power from the shafts are parallel to the disc rotation axis, and the pair of central tilling shafts is viewed from above with respect to the center line in the width direction of the left and right disc rotors. A plurality of central tilling blades are arranged on the left and right central tilling shafts so that the tip rotation trajectories of the tilling blades overlap and cross-rotate to prevent residual tillage. 1. A disc-type rotary tiller, characterized in that it is configured to be attached to the disc rotary shaft and to change the mounting angle of the transmission case with respect to the disc rotation shaft.