JPH09149701A - Rear cover of rotary tilling tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change soil grinding performance by altering a space part for carrying around dug mud in a rotary tiller from the outside by a simple operation. SOLUTION: The tops of plural rotary blades 1 are covered with a main cover 3 and a rear cover 4 is vertically swingably attached to the rear end of the main cover 3. The front and rear edge parts of an elastic plate 5 as a rubber plate are attached to the inside of the rear cover 4. The middle part of the rubber plate is pushed and pulled by a working tool 6 to expand and contract by a simple operation handling tool such as an electric motor. The distance between the rotary blades 1 and the rubber plate is changed, the solid grinding properties of the rotary tiller are altered to make the surface soil of dug soil fine or coarse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear cover for a rotary tiller. The lump of mud excavated by the plowing blade comes into contact with the coverings such as the main cover and the rear cover as the plowing blade rotates, and the whole rotates with the plowing blade to crush the clod into smaller pieces. At this time, the crushability is changed by changing the gap between the tilling blade and the covering.

[0002]

2. Description of the Related Art Conventionally, a rear cover swinging back and forth or up and down has been disclosed in Japanese Utility Model Publication No. 50-64506, Japanese Utility Model Publication No. 52-29131, and Japanese Unexamined Patent Publication No. 3-262401.
It is well known in Japanese Patent Publication No.

[0003]

In all of the above-mentioned conventional devices, it is necessary to descend from the tractor for operation, and if the gap between the cover and the tilling blade is changed, the swing angle of the rear cover itself changes. However, there is a drawback that the leveling performance changes.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve such a problem of the conventional device, and has taken the following technical means. That is, a plurality of tilling blades 1,
1. . . The upper part of the tilling pipe 2 with the main cover 3
The rear cover 4 which is covered with the rear cover 4 and swings in the vertical direction to move toward and away from the cultivating blade 1 is provided on the rear portion of the main cover 3, and the rear cover 4 is provided with the elastic plate 5 on the cultivating blade 1 side. The rear cover of the rotary tiller is characterized in that a one-touch type actuator 6 for adjusting the perspective of the elastic plate 5 is provided on the inner surface of the cover 4.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated example shows a rotary tiller 7 which is attached to a front part or a rear part of an agricultural tractor (not shown) so as to be vertically movable and excavates the soil surface for traveling. The present invention is folded into the rear cover 4 part to be covered. The rotary tiller 7 has a front end of a top link 9 pivotally supported by a hitch 8 in the center in the left-right direction, which is fixed above the rear end of the agricultural tractor body, and a front end of the mast 10 is pivotally supported at the rear end of the top link 9. Further, the front ends of the lower links 11, 11 are pivotally supported on the lower left and right of the rear end of the mission case of the tractor, and the rear end of the lower link 11 is a beam 13, which protrudes leftward and rightward from the transmission case 12 at the center in the left-right direction.
Support plates 15 fixed to 14 are pivotally connected to front ends of the lower plates 11, and lower ends of left and right lift rods 16 and 16 are pivotally supported at midpoints of the lower links 11 to thereby lift the lift rods 1.
By rotating the lift arm 17 by pivotally connecting the upper ends of the lift arms 6 and 16 to the lift arms 17 and 17,
Can be raised and lowered.

The mast 10 is mounted on the central transmission case 12.
Pivotally supporting the middle part of the mast 10 and the support plate 1
Left and right reinforcing links 18, 18 are interposed between the parts 5, 15. A side plate 19 is fixed to the right side beam 14 side end, and a side transmission case 20 is fixed to the left side beam 13 side end between the side plate 19 and the side transmission case 20 lower end. The cultivating pipe 2 is mounted on the shaft,
Plowing blades 1, 1. . Have been contacted.

The left and right support plates 15 and 15 have rear portions,
The left and right hitch pipes 28, 28 are pivotally supported so as to be swingable in the vertical direction, and a mounting pipe 30 having a gauge wheel 29 attached thereto is attached to the rear portion of the hitch pipe 28. 31
Is a telescopic device, which is the rear portion of the mast 10 and the hitch pipe 2
It is a screw attached between 8 and rotates the handle 32 to adjust the hitch pipe 28 up and down.

The drive of the tillage pipe 2 is transmitted from the PTO shaft projecting to the rear end of the agricultural tractor to the input shaft 22 of the central transmission case 12 via the universal joint 21.
The sprocket in the side transmission case 20 is driven by the transmission shaft (not shown) in the beam 13 on the left side via the bevel gear, and the tilling pipe 2 is driven via the chain.

In order to prevent the cultivating soil from scattering due to the drive rotation of the cultivating pipe 2, the cultivating blades 1, 1. . . . The upper part of the rotation locus of the above is covered with the main cover 3, and the rear part is covered with the rear cover 4. Reference numeral 23 denotes a swinging shaft, which is a shaft with which the rear end portion of the rear cover 4 swings in the vertical and forward / backward directions with respect to the rear end portion of the main cover 3. Reference numeral 33 is a handle for the rotating cover, and the expansion / contraction tool 34 such as a screw attached between the rear part of the mast 10 and the rear part of the main cover 3 is expanded / contracted so that the main cover 3 is centered around the cultivating pipe 2 part. Rotate back and forth. Left and right support plates 35, 35 are provided on the left and right of the rear end of the main cover 3 at regular intervals. 37, 37 are held. The lower end of the rod 37 is pivotally supported by a mounting plate 36 with bolts, pins, etc., and the upper part of the rod 37 is penetratingly attached to a top 38 which is pivotally attached to the support plate 35, and pressure springs are provided above and below the top 38. 39,
By mounting 40 so that the pressing load can be adjusted, in other words, the load of the movement of the rod 37 in the expansion and contraction direction is adjusted.

Further, on the inner surface side of the main cover 3 and the rear cover 4 in contact with the excavated mud, a front soil-adhesion prevention plate 24 and a rear soil-adhesion prevention plate, which is an elastic plate 5, are respectively locked in front. It is attached via tools 26, 26 and rear locking tools 27, 27. The front engaging members 26 are a pair of grooves on the front and rear sides facing each other, and the front surface of the soil adhesion preventing plate 24, which is a polymer resin flat plate, having a hard surface but bending as a whole between the front and rear grooves is formed into an arc shape. It is bent and held so as to be along the curved surface of the main cover 3, and the plowing blades 1, 1. . Since the excavated soil carried around by the rotary excavator contacts the resin plate in a substantially tangential direction, due to the characteristic of the polymer material that attaches importance to the surface slippage, even if soil is attached, it will be pushed to the next soil and the mud Since it moves, it prevents mud from adhering to the surface of the front side soil adhesion preventing plate 24 which is a resin flat plate.

The soil adhesion prevention plate on the rear side, which is the rear cover 4, is the elastic plate 5 of the main part of the present invention, and the elastic plate 5 has the plowing blades 1, 1. . . Since the mud excavated in step abuts from the right angle side, by attaching rubber material such as elastic material, synthetic rubber, sponge, urethane rubber, etc. In such a case, the mud adhered to a certain extent or more is prevented by contacting the scattered soil or peeling due to its own vibration inertia. Then, a plurality of button-shaped rear locking devices 27, 2 for attaching a rubber plate-like flat plate
7. . . Then, the end of the elastic plate 5 is attached to the inner surface of the rear cover 4 via a bolt (not shown), and the elastic plate 5 which is a rubber plate-like flat plate and is a rear soil adhesion preventing plate is locked.

Further, as shown in FIGS. 3 and 4, the elastic plate 5
Project the tip of the operating rod 41 to the middle part in the front-back direction,
A pressing plate 42 is attached to the protruding tip portion with bolts 43, 43. . .
Installed with The holding plate 42 is wide across the width direction of the rear cover 4, and is a flat plate like a band-shaped strip plate in the up-down or front-rear direction, and when the operation rod 41 is projected by the operation tool 6 mechanism described later. The elastic plate 5 alone approaches the cultivating blade 1 side while keeping the flattening angle of the rear cover 4 so that the gap between the elastic plate 5 and the cultivating blade 1 is reduced and the operating rod 41 is shortened. It is movable until it contacts the inner surface of the cover 4, and the elastic plate 5 and the plowing blade 1
The gap between and becomes wider.

The actuating tool 6 decelerates the forward / reverse rotation operation of the electric motor 44 with a gear and transmits it to the telescopic shaft 45. Telescopic axis 4
5 is a bolt-like screw tool, and the rear end is a rear cover 4
Is attached to a support frame 46 integrated with the elastic plate 5 and the other end side is attached to the above-mentioned operating rod 41.
Adjust the middle part of to the side of the tilling blade 1. Reference numeral 47 denotes a guide shaft, which guides the expansion and contraction when there is one expansion and contraction shaft 45 in the central portion. If the guide shaft 47 is expanded and contracted by another expansion and contraction shaft 45, the elastic plate 5 can be moved more smoothly.

When the gap between the elastic plate 5 and the plowing blade 1 becomes narrow, the mud soil excavated by the plowing blade 1 goes around the plowing pipe 2 together with the plowing blade 1, and the crushed soil of the soil mass is promoted while the crushing performance is improved. , As horsepower consumption increases, it becomes difficult to keep the clod large. When it is desired to leave the excavated mud as large as possible, if the rotation direction of the electric motor 44 is remotely controlled so that the gap between the elastic plate 5 and the tilling blade 1 is widened, the amount of excavated mud carried around is reduced and the cultivated soil mass remains large. Can be used with less horsepower.

As shown in FIG. 2, corner covers 48, 48 are attached to the left and right ends of the rear cover 4, and the corner covers 48, 48 are attached and detached according to the working mode. A rubber plate 49, which will be described in detail with reference to FIG. 5, is attached to the inside of the corner cover 48 in a superposed manner, and even if the corner covers 48, 48 are removed, the blowing of mud is prevented.

In the first example shown in FIG. 1, the mounting pipe 30
On the other hand, the vertical pipe 50 is upright, and in order to adjust the gauge wheel 29 back and forth, the mounting pipe 30 is removed from the fixing pin (not shown) with respect to the hitch pipe 28 and the expansion and contraction is adjusted in the front and rear direction. Then, it is locked again with the fixing pin. On the other hand, FIG. 5 and FIG.
Is a vertical pipe 50 for the hitch pipe 28a.
Since the portion a is attached with the advance angle by the angle “B”, the gauge wheels 29a, 29a can be attached close to the rubber plate 49. Also, gauge wheel 2
When adjusting 9a rearward, first adjust the gauge wheel 2
9a, 29a are removed from the vertical pipes 50a, 50a of the integral hitch pipe 28a by the mounting pins 52, 52, and then the mounting pins 51, 51 at the front end of the hitch pipe 28a are removed, and the lower end of the expander 31 is further removed. When the hitch pipe 28a is turned upside down after being removed from the hitch pipe 28a, the vertical pipe 50a has a receding angle by the angle "B", so that the gauge wheel 29a can be set away from the rear cover 4.

The third example shown in FIG. 7 is a gas damper 53 for both pushing and pulling, and includes a rod 37 for pressing the rear cover 4 of the first example shown in FIGS. It is another figure example which changes the pressure spring 39 and the lower pressure spring 40 part. The gas damper 53 includes a cylinder 56 and a piston 56 having a throttle hole 55, a telescopic shaft 57 that integrally projects with the piston 56 and protrudes to the outside, pressurized gas chambers 54a and 54b above and below the piston 56, and both gas chambers. It is composed of upper and lower communication passages 59 and 60 having a check valve 58 connecting 54a and 54b. Then, a mounting hole 61 at the upper end of the tubular body 54 is mounted at the tip of the support plate 35 projecting rearward from the main cover 3 of the rotary tiller 7, and a mounting hole 62 at the lower end of the telescopic shaft 57 is provided at the middle portion of the rear cover 4. The rear cover 4 is attached to the tip of the mounting plate 36 to make the swinging motion of the rear cover 4 with respect to the main cover 3 vertical or front-back direction heavy. A predetermined amount of oil is enclosed below the inside of the cylindrical body 54, and high pressure gas is filled in the other portions, and the upper and lower pressurized gas chambers 54a and 54b are communicated with each other through a throttle hole 55.

The rear cover 4 includes plowing blades 1, 1. . The mud surface of the field excavated by the rotation of the vehicle is traveling with a constant load, and the pressure of the mud surface is suppressed by this pressure, and the excavated mud is stored in the front part of the rear cover 4 to lower the ground surface. It also releases mud, and evens out the whole by moving the soil. Rear cover 4
If the excavated soil is always accumulated on the front surface of the, the entire length of the gas damper 53 is only reduced by the resistance of the excavated soil, and if only a reaction force against it is released. It is good, but when the dents and protrusions on the surface are continuous, a heavy damper will slow down the overall length and the compression performance will be partially inferior. The amount of accumulated mud changes drastically and the surface soil is in a undulating state, resulting in poor leveling performance.

When there is no upper and lower communication passages 59 and 60 having a check valve 58 for connecting both gas chambers 54a and 54b, the expansion and contraction operation of the gas damper 53 becomes smaller as the diameter of the throttle hole 55 becomes smaller. However, the upper and lower communication passages 59 and 60 having the check valve 58 are always heavy.
With this configuration, the gas damper 53 is lightly stretched when the expansion shaft 57 is suddenly extended, and is heavy by performing a damper action when the expansion shaft 57 is stretched at a predetermined speed or less. Hereinafter, the operation will be described.

When the mud on the front surface of the rear cover 4 disappears due to the depression of the ground surface during traveling, the telescopic shaft 57 is pulled in the direction in which its entire length extends due to the weight of the rear cover 4. At this time, if the damper is heavy, the lowering of the rear cover 4 is restricted by the damper action, and the rear cover 4 moves slowly. However, in the structure having the upper and lower communication passages 59 and 60 having the check valve 58, the lower portion of the piston 56 is pressed. The internal pressure of the pressurized gas chamber 54b rises sharply, and the pressurized gas chamber 54 above the piston 56
Since a decreases sharply, the check valve 58 automatically opens due to the differential pressure, and the upper and lower pressurized gas chambers 54a and 54b are connected at the same pressure via the upper and lower communication passages 59 and 60. The rear cover 4 rapidly descends regardless of the size of the hole 55. When the rear cover 4 comes into contact with the ground surface, the check valve 58 automatically closes because the dead weight of the rear cover 4 on the telescopic shaft 57 does not act, and the gas damper 53 closes the throttle hole 5.
It expands and contracts with a weight corresponding to the diameter of 5. In other words, this structure moves to the ground side as quickly as without a damper when there is no soil, and when it comes into contact with the ground, it expands and contracts, slowly changing its posture in response to the load of the damper, and performing compression and leveling. .

8 and 9 show an improved type of the damper check valve 58 of the third example, which will be described below as the fourth example. Since the check valve 58 in the example of FIG. 3 is a ball type valve that moves up and down by its own weight, the mounting direction of the gas damper 53 is naturally limited. For example, the gas damper 53 cannot be seen inside. When the valve is installed upside down or horizontally, the function of the check valve 58 may change and the performance may not be exhibited. On the other hand, the omnidirectional check valve 63 shown in FIG.
Since the omnidirectional check valve 63 operates with less influence of gravity, the gas damper 53a is mounted vertically from the horizontal position. It is not limited to any of the directions and can be used as various damper mechanisms.

The operation of the omnidirectional check valve 63 will be described below. For example, in an automobile, a tractor cabin, or the like, when used as a gas damper 53a of an opening / closing door 69 in which one edge is used as a hinge 70 and the other is rotated,
Attach the mounting hole 61a on the cylinder 54c side to the machine frame 68 side,
A mounting hole 62a on the side of the telescopic shaft 57a protruding outward from the piston 56a is mounted on the opening / closing door 69.

When the driver slowly opens and closes the open / close door 69, the high pressure gas enters and exits through the throttle hole 55a of the piston 56a and can be opened and closed with a certain resistance. When the driver vigorously opens the opening / closing door 69 in the direction of the arrow "a", the piston 56a moves to the door side so that the high pressure gas in the left chamber inside the cylinder 54c is partially or squeezed. And flows to the room on the right side, and most of it flows from the communication passage 60a on the left side to the ball valve 64 of the omnidirectional check valve 63.
9 against the push spring 65, and open from the state shown in FIG.
In the state (b), the ball valve 64 is floated between the first seat 66 and the second seat 67 to allow high-pressure gas to freely flow into the right communication passage 59a, and the door can be opened lightly without a damper action. .

Further, when a strong wind pressure acts on the inner surface of the door due to a gust of wind when opening the door, it is dangerous to open the door lightly. Therefore, when further pressure acts on the left communication passage 60a, The ball valve 64 is pressed against the second catch 67 by the pressing force "B", and the communication passage 5 on the right side is pressed.
The movement of the high-pressure gas to 9a is closed, and a damper action is performed by the throttle hole 55a. This is shown in FIG.

With the gas damper 53a using the omnidirectional check valve 63, the damper can be attached in any direction.

[0026]

As described above, the present invention has a plurality of plowing blades 1, 1. . . The main cover 3 covers the upper part of the cultivating pipe 2 attached with the rear cover 4, and the rear cover 4 which swings in the vertical direction and comes in contact with and separates from the cultivating blade 1 is provided at the rear part of the main cover 3, Since the elastic plate 5 is provided in the above, and the elastic plate 5 is adjusted by the one-touch type actuator 6, the cultivating blades 1, 1. . The spatial distance between the end of the rotation locus and the inner surface of the rear cover 4 can be freely changed, and the size of the lump of excavated mud can be adjusted according to this change. In addition, since the angle of the rear cover 4 with respect to the main cover 3 does not change when the space distance is changed, it is possible to change the crushing performance without changing the leveling performance of the lower edge of the rear cover 4.

[Brief description of the drawings]

FIG. 1 is a side view of the entire tillage implement of the first example, in which the present invention is folded.

FIG. 2 is a rear view of FIG.

FIG. 3 is an enlarged plan cross-sectional view of a main part of FIG.

FIG. 4 is a cross-sectional plan view taken along the line AA of FIG.

FIG. 5 is an overall perspective view of the second example, showing a tail wheel mounting hitch portion which is another main portion.

FIG. 6 is a partially enlarged side view of FIG.

FIG. 7 is an overall side cross-sectional view of the third example, showing a damper part of another main part.

8 is an overall side sectional view showing a modified example of FIG.

FIG. 9 is an operation explanatory view of FIG. 8;

[Explanation of symbols]

 1 Tilling blade 2 Tilling pipe 3 Main cover 4 Rear cover 5 Elastic plate 6 Actuator

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tsune Takahashi 1-Yachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. A plurality of tillage blades 1, 1. . . The main cover 3 covers the upper part of the cultivating pipe 2 attached with the rear cover 4, and the rear cover 4 which swings in the vertical direction and comes in contact with and separates from the cultivating blade 1 is provided at the rear part of the main cover 3, A rear cover for a rotary tiller, characterized in that a one-touch type actuating tool 6 for adjusting the elastic plate 5 in perspective is provided on the inner surface of the rear cover 4 in the tiller equipped with the elastic plate 5.