JP2001178217A - Fertilizer applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fertilizer applicator capable of suppressing so called bridging even when the fertilizer is rather wet, capable of keeping continuous application, hardly causing much decreased in storage capacity of a tank and capable of realizing low-cost. SOLUTION: This fertilizer applicator has a fertilizer agitator 30 having an eccentric shaft 33 by a eccentric amount d to a application shaft 7, an iron planet ring 34 freely rotatable around the shaft 33 as a center of rotation and supporting a agitating arm 31, a magnetic joint 35 transferring power of the shaft 33 to the ring 34 with allowing relative self rotation of the ring 34 to purge resistance to the shaft 33 and a ball bearing 36 installed between the planet ring 34 and the eccentric shaft 33. If the application shaft 7 is rotated, the planet ring 34 revolves according to revolving of the shaft 33 but the ring 34 relievingly rotates on its own axis according to load resistance of the arm 32, so the tangential velocity of the arm 32 is delayed and circular vibration having a vibration frequency corresponding thereto is generated and so the agitating arm 32 is vibratingly rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fertilizer spreader provided with fertilizer stirring means for stirring fertilizer in a tank.

[0002]

2. Description of the Related Art Conventionally, a self-propelled fertilizer spreader that sprinkles fertilizer by centrifugal force while self-propelled, as shown in FIG. 5, for example, comprises a pair of left and right front wheels, a drive wheel 1a (1b) and a control wheel. A body frame 1 having a certain tail wheel 1c, a small engine 2 mounted on the rear part of the body frame 1, and a forked steering handle 3a (3b) extending rearward from a vertical frame 3 standing on the body frame 1. And a fertilizer spraying device 4 mounted on the front part of the body frame 1. The driving force from the small engine 2 is transmitted via a V-belt (not shown) to a transmission unit 5 between the driving wheels 1a (1b). (See Fig. 6)
From the transmission section 5 to a traveling drive axle 6 having a horizontal axis and a dispersion driving shaft 7 having a vertical axis. By operating the accelerator lever 7c, the engine speed changes, and the running speed of the fertilizer spreader can be varied.

Further, as shown in FIG. 6, a fertilizer spraying device 4 is fixed to a spray driving shaft 7 via a boss 7a, and has a rotary spray plate 9 having a plurality of spray blades 9a, and a tank above the rotary spray plate. A fertilizer tank (fertilizer hopper) 15 fixed on the mounting base plate 10, and a rod-like member that is fixed to a tip end of the spraying shaft 7 penetrating the bottom plate 15 a of the fertilizer tank 15 with a fastening bolt (not shown) and horizontally rotates. It has a stirring arm 12, one or more fertilizer pits 15b formed in a bottom plate 15a of a fertilizer tank 15, and a fertilizer pit 11a aligned with these fertilizer pits 15b. A disk-shaped shutter plate 11 that is superimposed on the back surface and rotatable around the bearing 7b. The bottom plate 15a and the shutter plate 11 constitute a fertilizer drop adjusting plate mechanism.

[0004] With the rotation of the spray drive shaft 7, the fertilizer tank 15
Since the stirring arm 12 in the inside also rotates so as to crawl on the bottom plate 15a, the stored fertilizer (not shown) accumulated in the fertilizer tank 15 is continuously supplied to the fertilizer drop hole 15b of the bottom plate 15a without unevenness and scraped. The fertilizer is continuously dropped on the rotating spraying plate 9 through the fertilizer dropping hole 11a of the shutter plate 11, and the centrifugal force of the spraying plate 9 causes the fertilizer to fall in a fan-shaped predetermined spraying range (within the spraying angle) in the forward direction in the traveling direction. It is scattered continuously. When the shutter operation lever 7d is operated, the shutter 11 rotates and the fertilizer drop hole 11a and the bottom plate 15a are rotated.
The degree of opening (hole overlapping degree) with the fertilizer dropping hole 15b can be adjusted, so that the flow rate of the fertilizer falling from the fertilizer tank 15 onto the rotary spreader plate 9 can be adjusted.・ Thinning is possible. Further, the rotation speed of the spray drive shaft 7 can be changed by operating an accelerator lever 7c provided on one of the handles 3a (3b), so that the centrifugal force of the rotary spray plate 9 can be increased or decreased, and the flying distance of the fertilizer can be increased. Length adjustment is possible.

Incidentally, Japanese Patent Application Laid-Open No.
As in the fertilizer drop adjusting plate mechanism of the fertilizer spraying device described in Japanese Patent No. 298741, a second shutter plate having a fertilizer drop hole is provided under the shutter plate 11 in an overlapping manner, and the rotation position of the second shutter plate is set. It may be configured so that the application direction of the fertilizer can be changed by adjusting. This fertilizer drop adjusting plate mechanism is capable of adjusting the range and direction in which the fertilizer is spread by changing the flow rate and the drop position of the fertilizer using two shutter plates.

[0006]

However, the above-mentioned fertilizer spreader has the following problems. That is, when spraying a relatively dry fertilizer such as a chemical fertilizer, the fertilizer remaining after being dropped into the spray plate 9 by the scraping of the stirring arm 12 swiveling on the bottom side in the funnel-shaped fertilizer tank 15. In the open spaces, relatively slippery or fluid (mobile) stored fertilizer is broken down and replenished, so continuous spraying can be maintained, but relatively wet organic fertilizer (compost) etc. Since the fertilizer with the property has stickiness, it is difficult for the fertilizer to spontaneously fall into the remaining space due to the scraping of the stirring arm 12, and only the swirling area of the stirring arm 12 in the stored fertilizer becomes hollow. The so-called bridging phenomenon, in which the fertilizer is solidified and remains in a cross-linked state, is likely to occur, and continuous stirring is almost impossible due to the idle rotation of the stirring arm 12.

In such a case, a method may be considered in which a stirring arm extended to the upper portion of the tank 15 is attached to the spray drive shaft 7 to stir the upper part of the stored fertilizer as a whole. In this case, since the rotation speed of the spraying shaft 7 is relatively high in synchronization with the self-propelled speed, the load resistance (torque) received by the stirring arm becomes excessive, and the stirring arm is forced to be robust, and the self-propelled fertilizer is sprayed. This leads to heavy weight and high cost of the machine. In addition, since the fertilizer stored in the tank is kneaded by vigorous agitation, the agglomeration (coupling) proceeds with the increase in viscosity, and it is rather difficult for the granular fertilizer to fall from the fertilizer drop hole.

On the other hand, when adopting a configuration in which the stirring arm 12 is rotated at a low speed, it is necessary to mount the stirring arm 12 via a reduction gear to a drive shaft of a different system from the spray drive shaft 7 for rotating the spray plate 9. Therefore, not only a new drive transmission system for the stirring arm 12 but also a gearbox must be fixed in the tank, which leads to an increase in cost.

[0009] In view of the above problems, an object of the present invention is to suppress the so-called bridge phenomenon even with a relatively wet fertilizer, thereby making it possible to continuously spray the fertilizer, and to significantly reduce the storage volume in the tank. It is an object of the present invention to provide a fertilizer spreader that can be operated at low cost without inviting.

[0010]

In order to solve the above-mentioned problems, the present invention not only rotates the stirring arm but also superimposes a circulating trajectory motion such as a circular vibration of the stirring arm itself on the turning motion. In this case, a means for performing a swing motion as a synthetic motion is taken.

That is, the present invention provides a fertilizer tank for storing a fertilizer having a fertilizer drop hole at a bottom portion, and a power transmission system tank for transmitting a rotational driving force from outside the fertilizer tank to the inside of the tank. A fertilizer agitator having an agitating arm for agitating the stored fertilizer by rotating in the fertilizer tank by the inner driven longitudinal axis, and a fertilizer spreader comprising: the fertilizer agitating means includes a vertical driven shaft in the tank. Exciting power transmission means for transmitting to the stirring arm power to convert rotation into rotation of the stirring arm about the vertical axis in the tank substantially as the center of rotation and movement of the stirring arm itself in a circulating path. It is characterized by. Here, the circular locus motion refers to a locus (a linear locus, an elliptical locus, a circular locus, a rectangular locus, etc.) closed during a one-cycle motion in which a point belonging to the agitating arm as a follower starts from a certain point and returns to the starting point again. Trajectory), which corresponds to a one-dimensional or three-dimensional translational vibration of each point belonging to the stirring arm.

In such a configuration, when the vertical driven shaft in the tank is driven to rotate, the stirring arm makes a revolving motion at the same time as the revolving motion by the motion converting action of the excitation type power transmission means. Even if there is an empty space in the stored fertilizer with wettability, the stored fertilizer is vibrated by the small circulating trajectory movement of the stirring arm, so that the fall of the fertilizer around the empty space can be induced, and the fertilizer is continuously stirred. be able to. This excitation power transmission means
It does not receive and excite the power of a separate system from the vertical driven shaft in the tank, nor is it self-excited vibration means such as a vibration motor.
It converts the rotating motion component of the stirring arm and the circulating trajectory motion component of the stirring arm itself into a vibration swinging motion based on the driven rotation of the vertical driven shaft in the tank. And there is no need to arrange any additional members, so that the structure of the stirring means can be simplified and made compact. Therefore, it is possible to provide a fertilizer spreader that does not cause a large decrease in the storage volume in the tank and can reduce the cost.

The circular locus motion may be linear vibration or elliptical vibration having a large stroke (amplitude range). However, in order to crush the stored fertilizer isotropically or multilaterally and to increase the frequency of collapse, two-dimensional vibration such as circular vibration is used. It is desirable that the circulation trajectory has a wide oscillation range. Of course, it is preferable that the circulating locus motion is a circular vibration having an amplitude shorter than the arm length of the stirring arm (the distance between the turning center and the farthest point). The load resistance due to the vibration can be made lower than the load resistance due to the turning motion, and it is difficult for the vibration to stop even in an overload state. In the case of circular vibration, it is also advantageous for simplifying the mechanism of the excitation type power transmission means itself.

This excitation type power transmission means does not always allocate a turning motion component and a vibration component of a uniform power ratio to the stirring arm, but turns according to the degree of load resistance received by the stirring arm by the stored fertilizer. It is appropriate to use automatic inversion means for reducing the power transmitted to the motion and relatively increasing the power transmitted to the trajectory motion. The turning motion of the stirring arm is more strongly affected by the load resistance due to the stored fertilizer than the vibration of the stirring arm itself.However, when the load torque is excessive, the turning motion of the stirring arm stops and follows this. The vibration of the stirring arm is also restrained,
The stirring action itself disappears, and it becomes difficult to eliminate the overload state. However, when the excitation type power transmission means is a complementary automatic reversing means of the above-described swirling motion and circulation locus motion, when a load resistance acts to reduce the swirling motion of the stirring arm by the stored fertilizer, On the contrary, the vibrating force of the stirring arm is intensified conversely, so even if the rotation of the stirring arm stops, the vibration with little load resistance can continue, so that the vibration can induce the fall of the fertilizer, Due to the decay of the load state, the agitating arm turns finely this time, which induces further collapse, escapes from the overload state sooner or later, and the swirling movement of the agitating arm is restored. As described above, in the overload state, the oscillating action is activated even though the swirling motion is reduced, and when the overload state is eliminated, the oscillating action is reduced but the oscillating action becomes active. In addition, the fertilizer can be continuously swirled while changing at a slow speed, and the fertilizer can be stirred without causing a bridging phenomenon even with a relatively wet fertilizer, and the fertilizer can be continuously dropped.

The automatic inverting means includes an eccentric body which rotates eccentrically with a predetermined eccentric amount with respect to the longitudinal axis in the tank;
A planetary body that easily rotates around the axis of this eccentric body and supports the stirring arm, and the power of the eccentric body is transmitted to the planetary body while allowing the planetary body to escape relatively to the eccentric body. And a joint having a joint. As the joint, a magnetic joint is appropriate from the viewpoint of durability. When the vertical driven shaft in the tank rotates, the eccentric body rotates eccentrically (revolves) with a predetermined amount of eccentricity. Although the eccentric body and the planetary body are coupled via a magnetic coupling, relative escape rotation (idling) is possible between the two due to slip resistance (step-out) of escape resistance.

In principle, if there is no frictional force between the two, the weight of the planetary body and the stirring arm, and no load resistance applied to the stirring arm, the planetary body will rotate relatively even if the magnetic coupling is weakly attracted. In order to rotate eccentrically (revolve) synchronously with the eccentric body without causing the eccentric body, the agitating arm performs a swiveling motion about the driven shaft in the tank as the center of rotation. Of course, the stirring arm receives load resistance and air resistance from the stored fertilizer, so if the total load resistance on the planet exceeds the adsorption force of the magnetic coupling, the planet will become eccentric. Although the planet revolves along with the revolution of the body, the planetary body gradually escapes and rotates,
Since the rotation speed of the stirring arm is reduced by the amount corresponding to the escape amount, the trajectory length of the circular vibration (oscillation radius is eccentric) corresponding to the amount of escape amount is added to the stirring arm. Performs a vibrating turn, which is a synthetic motion in which the slow turning motion and the circular vibration are superimposed. Therefore, in the circular vibration of the stirring arm, the frequency of the circular vibration automatically increases and decreases according to the increase and decrease of the load resistance, and the force of the circular vibration increases and decreases. The fertilizer can be crushed smoothly without any problem. In the case of an overload state, a complete slip motion without drag occurs in the magnetic coupling, so that the swirling motion of the stirring arm is stopped, and the frequency of the circular vibration is maximized. This maximum frequency is the revolution frequency of the planet.

Here, a bearing may be interposed between the planetary body and the eccentric body in order to support the overload applied to the planetary body and reduce unnecessary frictional force. Ball bearings are fine. A planet may be arranged inside the bearing, and an eccentric may be arranged outside the bearing, or vice versa. In addition, the sun gear mounted on the vertical driven shaft in the tank and the planet gear mounted on the eccentric shaft may be engaged with each other, and a transmission mechanism may be built in. Is preferably formed by integrally connecting the vertical driven shaft in the tank and the eccentric shaft with a fastening bolt or the like. In such a case, the eccentric body rotates one revolution and one revolution.

The magnetic coupling may be provided on the inner and outer peripheral surfaces of the eccentric body and the planetary body.
It is preferable to provide between the butting surfaces of the eccentric body and the planetary body with respect to the axial normal. Of course, when provided on the peripheral surface, both the diameter reduction of both bodies and the securing of the magnetized area can be achieved at the same time.

The magnetic coupling is formed by forming one of the eccentric body and the planetary body with a magnetic material, and is fixed on the other butting surface and has a magnet plate which is combined with one of the butting surfaces. Have. Since the eccentric body or the planetary body is used as a follower or a follower of the magnetic coupling, the number of parts can be reduced, and the cost can be reduced.

As the magnetic plate of the magnetic coupling, a magnetic plate having a holed magnetic plate having a plurality of holes formed in a ring around the center of rotation and a magnet embedded in the hole is employed. A solid large-sized magnet plate has its own high manufacturing cost and a long magnetic path protruding from the magnetic plate on the other side.
Adsorption power is weak. However, when a magnetic material with a hole that functions as a yoke plate is used, a magnetic path protruding from the magnetic material between adjacent holes is formed close to the magnetic material, so that the length of the magnetic path is minimized, and the attraction force is increased, The threshold torque can be increased. Also,
When the magnet embedded in the hole is positioned so that it protrudes slightly from the surface of the magnetic plate with holes, and a test operation is performed, the surface of the protruding magnet is inevitably abraded and flattened, and the infinite contact with the magnetic material on the mating side occurs. This is advantageous because a small gap is formed.

The above-mentioned fertilizer spreader may be a self-propelled fertilizer spreader. In such a case, the vertical driven shaft in the tank is
Since the spraying shaft for rotating the spraying blades can be extended upward to the shaft end that penetrates the bottom of the fertilizer tank, there is no need to newly install a separate shaft or drive transmission system. Cost can be reduced.

[0022]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a left side view showing an overall appearance of a self-propelled fertilizer spreader according to an embodiment of the present invention, and FIG.
Is a longitudinal sectional view showing a fertilizer stirring device in the self-propelled fertilizer spreader, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. It is a top view for explaining the movement form of a stirring arm.

The self-propelled manure spreader of this embodiment also has a pair of left and right front wheels, ie, a drive wheel 1a (1b) and a control wheel, ie, a tail wheel 1c.
A small engine 2 mounted on the rear of the body frame 1, a steering bifurcation handle 3a (3b) extending rearward from a vertical frame 3 standing on the body frame 1, and a body frame 1, and a driving force from the small engine 2 is transmitted to the transmission unit 5 between the driving wheels 1a (1b) via the V-belt 2a, and the transmission unit 5 And is transmitted to a horizontal driving drive axle 6 and a vertical spreading drive shaft 7.
By operating an accelerator lever (not shown), the engine speed changes, and the running speed of the fertilizer spreader can be varied.

The fertilizer spraying device 24 includes a spray driving shaft 7.
And a fertilizer tank (fertilizer hopper) fixed on a tank mounting base plate (not shown) above the rotary spray plate 9 having a plurality of spray blades 9a fixed thereto via a boss 7a.
25, a fertilizer stirring device 30 fixed to a tip end of the spraying shaft 7 penetrating the bottom plate 25a of the fertilizer tank 25 with a fastening bolt 31, and one or two or more formed on the bottom plate 25a of the fertilizer tank 25. It has a fertilizer dropping hole 25b, a fertilizer dropping hole 11a aligned with the fertilizer dropping hole 25b, and a rotatable disk-shaped shutter plate 11 superimposed on the back surface of the bottom plate 25a of the fertilizer tank 25. Become.
The bottom plate 25a and the shutter plate 11 constitute a fertilizer drop adjusting plate mechanism.

Since the stirring arm 32 in the fertilizer tank 25 also turns in synchronization with the rotation of the spray drive shaft 7, the fertilizer tank 2
The stored fertilizer (not shown) accumulated in the inside 5 is continuously supplied to the fertilizer drop hole 25b of the bottom plate 25a without being shifted, and is scraped off, and the sprinkling plate 9 rotating through the fertilizer drop hole 11a of the shutter plate 11 is rotated. The fertilizer is continuously scattered in the fan-shaped predetermined spraying range (within the spraying angle) forward in the traveling direction by the centrifugal force of the spraying plate 9 because the fertilizer continues to fall upward.

The fertilizer stirring device 30 of the present embodiment has an iron eccentric shaft 33 that rotates eccentrically with respect to the spraying shaft 7 in the tank 25 by an eccentric amount d, and easily rotates around the axis of the 33 eccentric shafts. The planetary wheel 34 supports the stirring arm 32 with bolts 32a, and the power of the eccentric shaft 33 allows the relative rotation of the planetary wheel 34 relative to the eccentric shaft 33 while allowing resistance to rotate. Magnetic coupling 35 transmitting to the
It has a ball bearing 36 interposed between the planetary wheel 34 and the eccentric shaft 33.

The eccentric shaft 33 has a substantially cylindrical shape, and has a shaft hole 33a for inserting the spraying shaft 7 at a position offset from the center by an eccentric amount d, and a shaft hole 33a on the circumferential side surface. It has a horizontal screw hole 33b for insertion and a reduced diameter projection 33c in the upper center.

The planetary wheel 34 has a substantially inverted cylindrical shape with a bottom, and a ball bearing 36 is interposed between the eccentric shaft 33 inserted into the cylinder and the cylinder wall 34a. This ball bearing 36
Consists of an outer ring 36a fitted on the cylindrical wall 34a, an inner ring 36b fitted on the eccentric shaft 33, and a plurality of steel balls 36c sandwiched between the two wheels. The ball bearing 36 is retained by a retaining ring 37. The eccentric shaft 33 is also prevented from falling off by a retaining ring 38.

The magnetic coupling 35 comprises a driving-side magnet plate 35a fixed to the stepped portion of the eccentric shaft 33 with a reduced diameter projection 33c by welding or the like, and a planetary wheel of a driven node which is fitted with the magnet plate 35a with an infinitesimal clearance. 34 and a bottom surface 35b. Magnet plate 35a
Has an annular bottom plate 35aa made of iron having a fitting hole to be fitted in the reduced diameter projection 33c, and a fitting hole to be fitted in the reduced diameter projection 33c with a gap. It is formed by fixing a magnetic plate with holes 35ab embedded with the disc-shaped magnet M by welding or the like.

When the dispersion shaft 7 rotates, the eccentric shaft 33 rotates eccentrically (revolves) with the amount of eccentricity d. Although the eccentric shaft 33 and the planetary wheel 34 are coupled via the magnetic coupling 35, since the coupling is the magnetic coupling 35, slip motion (step-out) occurs.
This allows relative escape rotation (idling) between the two.

In principle, the frictional force between the two and the planet wheels 34
In addition, when there is no weight of the stirring arm 32 and no load resistance received by the stirring arm 32, the planetary wheel 34 is integrally synchronized with the eccentric shaft 33 without causing relative escape rotation even with a weak attraction force of the magnetic coupling 35. In order to perform eccentric rotation (one revolution and one revolution), the stirring arm 32 performs a swiveling motion about the spraying shaft 7 substantially as the center of rotation such that the solid line locus of the point A of the stirring arm 32 in FIG. Things. But in reality,
The frictional force and the weight of the planetary wheel 34 and the stirring arm 32 exist, and the stirring arm 32 receives load resistance and air resistance from the stored fertilizer. When the planetary wheel 34 revolves along with the revolution with the eccentric shaft 33, the planetary wheel 34 gradually retreats and revolves. As the turning speed decreases, the trajectory length of the circular vibration (the vibration radius is the eccentric amount d) is added to the stirring arm 32 in proportion to the amount of escaping, and as shown by the broken line trajectory in FIG. The stirrer 30 rotates eccentrically with respect to the spray shaft 7 in the tank 25 by an eccentric amount d.

In the case of an overload state, a complete slip motion without dragging occurs in the magnetic coupling 35, so that the swirling motion of the stirring arm 32 is stopped, and the frequency of the circular vibration is maximized. This maximum frequency is the revolution frequency of the planetary wheel 34.

The fertilizer stirring device 30 does not receive and excite the power of a separate system from the spraying shaft 7 and is not a self-excited vibration means such as a vibration motor. Since this is converted into a vibrating swirling motion, which is a combined motion of the swirling motion component of the agitating arm 32 and the circulating trajectory motion component of the stirring arm 32 itself, it can be provided between the spraying shaft 7 and the stirring arm 32. Since there is no need to dispose members, the configuration of the stirring device 30 can be simplified and downsized. Therefore, it is possible to provide a fertilizer spreader that does not cause a large decrease in the storage volume in the tank 25 and that can be reduced in cost.

Since the magnetic coupling 35 uses the magnetic planetary wheel 34 itself as a follower, it contributes to the reduction of the number of parts and can reduce the cost. Further, in the magnetic coupling 35, since the magnet M is embedded in the hole of the magnetic plate 35ab with a hole, a magnetic path protruding from a magnetic material between adjacent holes is formed as close as possible. Is minimized, the attraction force is enhanced, and the threshold torque can be increased. Further, when the magnet M embedded in the hole is positioned and set so as to slightly protrude from the surface of the perforated magnetic plate 35ab, and the test operation is performed, the surface of the protruded magnet M is inevitably abraded and flattened. This is convenient because it forms an infinitesimal gap with the bottom surface 35b of the planetary wheel 34.

[0035]

As described above, the fertilizer sprayer according to the present invention not only makes the stirring arm swivel, but also superimposes the circulating locus motion such as the circular vibration of the stirring arm itself on the swirling motion. The following advantage is provided by providing the excitation type power transmission means for performing the vibrating swing as a motion.

(1) Since the stirring arm is swirled by the motion converting action of the excitation type power transmission means, and at the same time performs a circulating trajectory movement, a relatively wet wet fertilizer is left empty by stirring by the swirling motion of the stirring arm. Even if it occurs, the stored fertilizer is vibrated by the circulating trajectory movement of the stirring arm, so that the fall of the fertilizer around the empty space can be induced and the fertilizer can be continuously stirred. This excitation type power transmission means does not receive and excite the power of a separate system from the vertical driven shaft in the tank, is not a self-excited vibration means such as a vibration motor, and is based on the driven rotation of the vertical driven shaft in the tank. In order to convert the rotation motion component of the stirring arm and the circulating trajectory motion component of the stirring arm itself into a vibrating rotation motion, it can be provided between the vertical driven shaft in the tank and the stirring arm. Since there is no need to arrange extra members, the structure of the stirring means can be simplified and downsized. Therefore, it is possible to provide a fertilizer spreader that does not cause a large decrease in the storage volume in the tank and can reduce the cost.

(2) Automatic reverse change in which the excitation type power transmission means reduces the transmission power to the turning motion and increases the transmission power to the circulating locus motion in accordance with the degree of load resistance applied to the stirring arm by the stored fertilizer. In the case of the means, the swirling motion is reduced in the overload state, but the vibration action is activated, and when the overload state is eliminated, the vibration action is reduced but the swirling movement becomes vigorous, so the stirring arm almost stops the swirling movement. In addition, the fertilizer can be continuously swirled while changing at a slow speed, and can be stirred without causing a bridging phenomenon even with a relatively wet fertilizer, so that the fertilizer can continue to fall.

(3) As the automatic reversing means, an eccentric body which rotates eccentrically with a predetermined eccentricity with respect to the longitudinal axis in the tank, and which can easily rotate about the axis of the eccentric body as the center of rotation. A configuration having a planetary body that supports the stirring arm and a joint that transmits the power of the eccentric body to the planetary body while permitting relative rotation of the planetary body to the eccentric body and resistive rotation can be adopted. The frequency of the circular vibration of the stirring arm automatically increases and decreases in accordance with the increase and decrease of the load resistance, and the force of the circular vibration increases and decreases, so that the fertilizer can be crushed smoothly without interruption. As the joint, a magnetic joint is appropriate from the viewpoint of durability.

(4) The magnetic force coupling is preferably provided between the butting surfaces of the eccentric body and the planetary body with respect to the axial normal. It is possible to realize easy manufacturing such as a magnetizing process.

(5) The magnetic joint is formed by forming one of the eccentric body and the planetary body with a magnetic material, and is fixed on the other butting surface and is combined with one of the butting surfaces. Having. Since the eccentric body or the planetary body is used as a follower or a follower of the magnetic coupling, the number of parts can be reduced, and the cost can be reduced.

(6) The magnet plate of the magnetic coupling has a holed magnetic plate having a plurality of holes annularly and discretely formed around its center of rotation, and a magnet embedded in the hole.
When a magnetic material with a hole that functions as a yoke plate is used, a magnetic path protruding from the magnetic material between adjacent holes is formed in the vicinity, so that the length of the magnetic path is minimized, the attraction force is increased, and the threshold torque is increased. Can be higher. Also, when the magnet embedded in the hole is positioned and set so that it slightly protrudes from the surface of the magnetic plate with holes, and the test operation is performed, the surface of the protruded magnet is inevitably abraded and flattened, and the magnetic material on the partner side is inevitably flattened. Is advantageously formed.

[Brief description of the drawings]

FIG. 1 is a left side view showing an overall appearance of a self-propelled fertilizer spreader according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a fertilizer stirring device in the self-propelled fertilizer spreader.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a plan view for explaining a movement form of a stirring arm in the fertilizer stirring device.

FIG. 5 is a left side view showing the overall appearance of a conventional self-propelled fertilizer spreader.

FIG. 6 is a longitudinal sectional view showing a fertilizer application device in a conventional self-propelled fertilizer application device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body frame 1a, 1b ... Driving wheel 1c ... Tail wheel 2 ... Small engine 2a ... V belt 3 ... Vertical frame 3a, 3b ... Steering bifurcated handle 5 ... Transmission part 6 ... Travel drive axle 7 ... Vertical axis Spraying drive shaft 7a ... Boss 9a ... Spraying blade 9 ... Rotary spray plate 11 ... Disc shutter plate 11a, 25b ... Fertilizer dropping hole 24 ... Fertilizer spraying device 25 ... Fertilizer tank (fertilizer hopper) 25a ... Bottom plate 30 ... Fertilizer Stirring device 31 ... Tightening bolt 32 ... Stirring arm 32a ... Bolt 33 ... Eccentric shaft 33a ... Shaft hole 33b ... Lateral screw hole 33c ... Diameter reduction projection 34 ... Planetary wheel 34a ... Cylinder wall 35 ... Magnetic coupling 35a ... Magnet plate 35aa ... Annular bottom plate 35ab ... magnetic plate with holes 35b ... bottom surface 36 ... ball bearing 36a ... outer ring 36b ... inner ring 36c ... steel balls 37, 38 ... stopper Ring d: Eccentric amount

Claims (10)

[Claims] 1. A fertilizer tank having a fertilizer dropping hole at a bottom thereof for storing fertilizer, and a vertical driven shaft in a tank of a power transmission system for transmitting a rotational driving force from outside of the fertilizer tank into the tank. A fertilizer agitator having a stirring arm for agitating the stored fertilizer by rotating in the fertilizer tank, a fertilizer spreader, wherein the fertilizer agitator, the rotation of the vertical driven shaft in the tank,
Exciting power transmission means for transmitting to the agitating arm, power for converting the rotational motion of the agitating arm and the circulating locus motion of the agitating arm itself around the vertical driven shaft in the tank substantially as the center of rotation. And fertilizer spreader. 2. The fertilizer spreader according to claim 1, wherein the circulating locus motion is a circular vibration having an amplitude shorter than a distance between the turning center and a farthest point of the stirring arm. 3. The excitable power transmission means according to claim 1, wherein the excitation power transmission means reduces transmission power to the swiveling motion and reduces relative power according to the degree of load resistance received by the stored fertilizer on the stirring arm. A fertilizer spreader which is an automatic reverse changing means for increasing transmission power to the circulation locus motion. 4. The eccentric body according to claim 3, wherein the automatic reversing means includes an eccentric body that rotates eccentrically with a predetermined eccentric amount with respect to the longitudinally driven shaft in the tank, and an axis of the eccentric body as a rotation center. A planetary body that is easy to rotate and supports the stirring arm; and a joint that transmits the power of the eccentric body to the planetary body while allowing the planetary body to escape relative to the eccentric body and resistively rotate. A fertilizer spreader characterized by comprising: 5. The fertilizer spreader according to claim 4, wherein the joint is a magnetic joint. 6. The fertilizer spreader according to claim 5, further comprising a bearing interposed between the planetary body and the eccentric body. 7. The fertilizer spreader according to claim 5, wherein the vertical driven shaft in the tank and the eccentric body are integrally connected. 8. The magnetic coupling according to claim 5, wherein the magnetic coupling is provided between abutting surfaces of the eccentric body and the planetary body with respect to an axial normal line. And fertilizer spreader. 9. The magnetic coupling according to claim 8, wherein one of the eccentric body and the planetary body is formed of a magnetic material and fixed on the other butting surface, and A fertilizer spreader comprising a magnet plate combined with the butting surface. 10. The magnetic plate according to claim 9, wherein the magnet plate has a magnetic plate with holes having a plurality of holes formed in a ring around the center of rotation, and a magnet embedded in the holes. A fertilizer spreader characterized by being formed.