JP3095113B2 - Seed feeding mechanism of seed gel coating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a seed supply mechanism which is a unit constituting a seed gel coating apparatus for producing a gel-coated seed.

[0002]

2. Description of the Related Art Conventionally, seeds are generally sown without being coated. However, in order to protect the seeds from damage by animals and to perform pretreatments such as sterilization and germination promotion before sowing the seeds. There is a coated seed for coating the seed. Conventional coated seeds are those which adhere to the seed surface by spraying a binder such as viscosity or fine sand or CMC mixed with saccharides on the seed, and when a fungicide, an oxygen generating agent, etc. are added to the coating material. is there. These are relatively hard coatings, but there are also soft coatings in which the seeds are coated with a gel or gelatinous material that swells when hydrated.

[0003] However, in the conventional coating technique, there has been no example of coating a seed using an aqueous gel that hardens only the surface layer. For this purpose, a gel coating apparatus for seeds which drops and supplies seeds onto a gel formed in a film form, coats the seeds with a gel film, and forms a large-diameter spheroid has been developed (Japanese Utility Model Application Laid-Open No. 5-7015). No. 5-
No. 7016).

FIG. 5 is a front view of a main part of a conventional example of a gel coating apparatus for seeds. A rotary driving device, which is an air-driven rotary actuator, is mounted on an upper surface of a mounting table 2 fixed to an upper end of a column 1. 3 is fastened by screws 4. The rotation drive device 3 causes the output shaft 3a to reciprocate and stop in a range of 180 degrees by air pressure. A cylindrical rotary shaft 6 provided at the center of the rotary arm 5 is connected to the output shaft 3a.

[0005] The nozzle adjuster 7 is inserted into holes provided at both ends of the rotary arm 5, and the nozzle adjuster 7 is fixed to the rotary arm 5 by two nuts 8 screwed into male threads 7 a provided on the outer peripheral surface of the nozzle adjuster 7. Is fixed to both ends. A pipe joint 9 is screwed into a female screw 7b threaded at the upper end of the nozzle adjuster 7 (see FIG. 6), and a flexible pipe (tube) 10 connected to the pipe joint 9 is provided with an electromagnetic valve (not shown). ) To a pneumatic source and a negative pressure source (not shown) (see FIG. 5).

A suction tip 12 made of a synthetic resin material is detachably fitted to a small-diameter cylindrical portion 11 extending from the lower end of the nozzle adjuster 7. The suction tip 12 is formed in a cylindrical shape having a taper whose diameter becomes smaller toward the lower end. When the suction tip 12 is pressed against the outer peripheral surface of the small-diameter cylinder 11, the suction tip 12 is elastically deformed and the small-diameter cylinder is formed. 11 (see FIGS. 5 and 6). The seed supply mechanism A is configured by the rotation drive device 3, the rotation arm 5, the nozzle adjuster 7, the flexible conduit 10, and the suction tip 12 described above.

A sliding guide member 13 is screwed to one side (the left side in FIG. 5) of the column 1, and is attached to an end of an elevating member (not shown) movable vertically along the sliding guide member 13. A seed container 14 having an open upper portion and containing a large number of seeds therein is attached, and the seed container 14 is moved up and down by an air cylinder (not shown) that drives the elevating member up and down.
The processing nozzle B shown in FIG. 7 is attached to the other side (the right side in FIG. 5) of the column 1.

The processing nozzle B has a coating chamber 16 formed inside a substantially rectangular parallelepiped valve body 15.
6 is connected to an opening 17 on the lower end surface of the valve body 15. The opening 17 is provided with a pipe (not shown) communicating with a coating material tank (not shown), and a reverse between the opening 17 and the coating material storage chamber 16 is constituted by a steel ball 18a and a spring 18b. A stop valve 18 is provided. Coating room 1
The gelling agent filled in 6 is pressurized and depressurized by a pressure plunger (not shown).

A valve case 2 is provided on the left side of the valve body 15.
0 is attached, a valve seat 21 a is formed at the lower end of a plunger insertion hole 21 penetrating the valve case 20 in the vertical direction, a bush 22 is fitted on the inner surface of the plunger insertion hole 21, and a hollow nozzle is formed on the inner surface of the bush 22. Plunger 2
3 is inserted to be able to move up and down. The pressure receiving surface 24 is formed by making the outer peripheral surface of the lower half of the nozzle plunger 23 small. A coating material flow path 25 that communicates the plunger insertion hole 21 with the coating material storage chamber 16 is provided, and a coating material (gelling agent) in a coating material tank (not shown) passes through the opening 17 and the check valve 18. As a result, the coating material is supplied to the coating chamber 16 and further filled in the coating material channel 25 and the plunger insertion hole 21.

On the upper surface of the valve case 20, a cylindrical portion 26 surrounding the plunger insertion hole 21 is provided.
A female screw provided on the inner surface of the spring adjuster 27 is screwed into a male screw provided on the outer peripheral surface of the spring 6. A spring receiver 28 is placed on the nozzle plunger 23, and a spring 29 is inserted between the spring receiver 28 and the spring adjuster 27.

The gel film forming operation by the processing nozzle B configured as described above is performed by the seed supply mechanism A and the seed container 16.
The lower end of the nozzle plunger 23 urged downward closes the valve seat 21a, but the pressurizing plunger removes the coating material in the coating material storage chamber 16. When the pressure is increased, the pressure receiving surface 2 passes through the coating material channel 25.
4 is pressed, the nozzle plunger 23 rises to open the valve, and the coating material flowing out from the lower end of the nozzle plunger 23 forms a gel film.

When the pressure plunger retreats and the pressure in the coating material storage chamber 16 is reduced, the nozzle plunger 23 pressed by the spring 29 descends and closes, and the coating material is replenished from the check valve 18. Is done. Nozzle plunger 23
When the valve is lowered and the valve is closed, the discharge of the coating material is stopped, but the gel film formed below the nozzle plunger 23 gradually drops down by its own weight.

On the other hand, the seed container 14 is raised, the suction tip 12 supplied with the negative pressure is inserted into a large number of seeds of the seed container 14, and after the suction tip 12 sucks the seed, the seed container 14 Descends, and then the rotating arm 5
The suction tip 12 that has rotated 0 degrees and sucked the seed is positioned above the processing nozzle B, and air pressure is supplied to the suction tip 12 so that the seed falls and is supplied to the gel film. The dropped and supplied seeds are wrapped in a hanging gel film, and the replenished gel is supplied to the upper part of the hanging gel film by the next valve opening, and the seeds are covered with the gel film. Next, when the valve is closed, the gel film, which cannot support the weight, falls downward and is supplied to a lower curing tank (not shown) while being spheroidized by surface tension, and after the surface is cured by the curing agent in the curing tank, Is sent to a washing tank to remove the curing agent.

In the above-described seed supply mechanism, when a negative pressure is supplied to the suction tip 12, only one seed is sucked at the lower end of the suction tip 12, so that the size of the seed depends on the size of the seed. The suction tip 12 having the optimum hole diameter is replaced. However, in the conventional suction tip 12 as shown in FIG. 6, there is a limit in reducing the hole diameter, and it is not possible to suck fine seeds. Therefore, as shown in FIGS. Suction tip 31 with suction hole 30
May be attached to the nozzle adjuster 7 '.

The nozzle adjuster 7 'has a tapered small-diameter portion 32 formed at the tip thereof. The suction tip 31 has a peripheral wall 31b provided around a lower end wall 31a and a small-diameter suction hole 30 formed in the lower end wall 31a. It was established. The method of attaching the suction tip 31 includes a fixing method in which the inner wall surface of the peripheral wall 31b is formed in a tapered shape, the inner wall surface of the suction tip 31 is fitted to the lower end of the nozzle adjuster 7 '(see FIG. 3), and a tapered shape. There is a fixing method in which a female screw 33 screwed on the inner wall surface is screwed with a male screw 34 screwed on the tapered small diameter portion 32.

[0016]

If the suction hole 30 is drilled in the lower end wall 31a, a hole smaller than the inner diameter of the suction tip 12 can be obtained. The hole diameter of the hole 30 must be processed to about 0.1 to 0.2 mm, and such a fine hole has a problem that is extremely difficult by drilling. 0.1-0.2m
Although the hole of m can be subjected to electric discharge machining, it requires an electrode having a fine diameter, and has a drawback that the production cost of the suction tip 31 is high because the degree of wear is severe. An object of the present invention is to solve such a problem, and it is possible to reduce the number of fine seeds by one.
Drill a fine hole that can only suck grains
Cutting force applied to the drill is extremely small.
Vibration during cutting is unlikely to occur,
An object of the present invention is to provide a suction tip 31 that can be manufactured at a low cost by preventing a drill from being broken by preventing a slide or the like.

[0017]

To achieve the above object, the present invention provides a nozzle adjuster in which a suction tip provided with a seed suction hole is detachably fitted to a tip of a nozzle adjuster, and the seed tip is provided by the suction tip. In the seed supply mechanism of the seed gel coating apparatus for sucking the seeds in the seed and supplying the sucked seeds to the gel film formed in the processing nozzle, the suction tip includes:
Guide the edge of a small diameter drill to the inner wall of the lower end wall of the recess
It is good to form a thin part so that it may become a surface .

Further , the suction tip of the present invention has a conical shape.
The concave portion is provided, and only the central portion is thin due to the concave portion.
The thin part, which gradually becomes thicker toward the periphery,
When drilling the thin part, the cutting resistance applied to the drill becomes extremely small, and the lower end wall is thin at the center only, so vibration does not easily occur during cutting. Since the conical recess has a shape and serves as a guide for the tip of the drill, it has an effect of preventing shaking and sliding at the start of cutting, and can prevent breakage of a drill having a small diameter. Thus, it is possible to drill a fine hole in the suction tip, and the suction tip can suck only one fine seed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The seed feeding mechanism of the seed gel coating apparatus of the present invention partially improves the above-mentioned conventional seed feeding mechanism, and most parts of the seed feeding mechanism are included in the seed feeding mechanism. Is the same as that of the conventional example. Referring to the drawings a specific example of the embodiment of the present invention, FIG. 1 is a front view of a seed supplying mechanism A ₁ of gel-coating apparatus seeds, 2 is a partially enlarged view of FIG. 1 . The rotation of the rotary arm 5 by 180 degrees by the rotary driving device 3 is the same as in the conventional example.

The nozzle adjusters 7 'attached to both ends of the rotary arm 5 are fixed by tightening two nuts 9, and a pipe 10 connected to the upper end of the nozzle adjuster 7' is connected to a pneumatic source and a solenoid via an electromagnetic valve. The communication with the negative pressure source is the same as in the conventional example, but a tapered small diameter portion 32 is formed on the lower end surface of the nozzle adjuster 7 '(see FIG. 2). The suction tip 31 is formed of an elastic material such as a plastic material, and has a lower end wall 31a and a lower end wall 31a.
a peripheral wall 31b provided around the periphery of the small diameter portion 32. The peripheral wall 31b is elastically fitted to the small diameter portion 32. Alternatively, as shown in FIG. 4, the female screw 33 provided on the inner surface of the peripheral wall 31b is
2 with a male screw 34 provided.

The causes of breakage of a small-diameter drill are as follows: a) When the cutting resistance increases during cutting. B) When there is center runout on the rotating drill tip. C) When the workpiece is liable to vibrate. D) Drill When the cutting edge starts to cut the workpiece, the drilling edge is easy to slide sideways, and when it slides, there is a case where the drilling edge is forcibly applied.In the present invention, these problems are solved as follows. did.

When a conical recess 35 is formed at the center of the inner wall surface of the lower end wall 31a with the tip of a relatively large-diameter drill, the bottom portion of the recess 35 allows a thin-walled portion 36 that enables small-diameter drilling. Is formed. The lower end wall 31a is thin at almost only the center portion and gradually becomes thicker toward the peripheral edge portion, so that the strength and rigidity of the lower end wall 31a are maintained.
Therefore, there is an advantage that vibration is less likely to occur during drilling than when the entire lower end wall 31a is formed to be thin.

According to the present invention, when the bottom of the conical recess 35 is drilled with a small diameter drill from the inside of the lower end wall 31a,
Since the thickness of the thin portion 36 is small, the cutting resistance of the drill can be extremely reduced, and the seed suction hole 37 having a size of about 0.1 to 0.2 mm can be formed. In addition, the conical recess 35 serves as a guide surface for preventing the swinging and sliding of the cutting edge of the small-diameter drill, and thus has an effect of preventing breakage of the drill at the start of cutting.

[0024]

As described above, the present invention is constructed as described above. By drilling a thin portion formed on a part of the lower wall end of the suction tip, the cutting resistance applied to the drill becomes extremely small. It has become possible to process a fine hole without breaking a drill having a fine diameter. Moreover, when this thin portion is formed by a conical recess, the lower end wall is
Only the central part is thin and hard to vibrate, and a conical recess
Guides the tip of the drill, causing shaking or sliding at the start of cutting.
And the effect of preventing breakage of the fine drill was improved. Thus, a suction chip having a fine seed suction hole capable of sucking only one small seed can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a seed supply mechanism of a seed gel coating apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of a suction tip attached to a seed supply mechanism.

FIG. 3 is a longitudinal sectional view showing an example of a suction tip when a thin portion is not provided.

FIG. 4 is a longitudinal sectional view showing another example of the suction tip when a thin portion is not provided.

FIG. 5 is a front view of a main part of a conventional seed supply mechanism.

FIG. 6 is a partially enlarged view of FIG. 5;

FIG. 7 is a longitudinal sectional view illustrating a nozzle portion.

[Explanation of symbols]

A ₁ Seed supply mechanism B Processing nozzle 7 'Nozzle adjuster 14 Seed container 31 Suction tip 31a Lower end wall 35 Conical recess 36 Thin section 37 Seed suction hole

Claims (1)

(57) [Claims] 1. A suction tip provided with a seed suction hole is detachably fitted to the tip of a nozzle adjuster, and the suction tip sucks the seed in a seed container. The sucked seed is formed in a processing nozzle. In a seed supply mechanism of a gel coating processing apparatus for seeds to be supplied to a gel film, the suction tip includes:
Guide the edge of a small diameter drill to the inner wall of the lower end wall of the recess
Provide a conical concave portion that becomes the surface, and the concave portion only
Is thin and gradually becomes thicker toward the periphery
A seed supply mechanism for a gel coating apparatus for seeds, characterized by forming a thin portion .