JPH06209612A - Mechanism for preventing bite of seed in vacuum sowing machine - Google Patents

Abstract

PURPOSE:To eliminate the trouble of inhibiting the rotary motion of a sowing drum caused by the intrusion of unsowed fine seed grains into a gap between a sowing drum and a lower end of a bottom plate at the bottom of the suction port in a seed hopper of a vacuum sowing machine. CONSTITUTION:A seed intrusion prevention member 1 made of an elastic material is protruded from a bottom plate 2a of a seed hopper 2 and the tip end of the prevention member is pressed against the surface of the sowing drum 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum sowing machine for sowing seeds such as vegetables on conveyed seedling raising trays.

[0002]

2. Description of the Related Art Conventionally, the seed drum is set on a carrier of a seedling raising tray, the seed drum is rotated, and the seed in the seed hopper is adsorbed to the outer periphery of the seed hopper through the suction port of the seed hopper and seeded on the seedling raising tray. Vacuum seeders are known.

[0003]

At the bottom of the suction port,
A slanted bottom plate is arranged so that the seeds can be slid from the upper part of the seed hopper and sent to the suction port, but there is a small gap between the lower end of the bottom plate and the sowing drum. Then, when sowing fine-grained seeds or seeds having a pointed portion, the seeds at the lower end portion of the bottom plate enter the gap between the seeding drum and the seed hopper below the adsorption port, and the rotating seeding drum is Not only does this hinder the rotation and drive of the seeding drum, but also damages the surface of the seeding drum.

[0004]

The present invention has the following constitution in order to solve the above problems. That is, a seed hopper is provided behind the rotating seeding drum, and in a vacuum seeder that adsorbs seeds to the seeding drum surface through the suction port of the seed hopper and sows the seeds, the bottom plate lower end of the suction port bottom of the seed hopper is elastic. A member is provided so as to project, and its tip is pressed against the seeding drum.

[0005]

The seed, which has slid off the bottom plate of the seed hopper, does not enter into the gap between the seed drum and the seed hopper below the suction port by the elastic member even when reaching the lower end of the bottom plate.

[0006]

The problems and configurations to be solved by the present invention are as described above. Next, the embodiments of the present invention shown in the accompanying drawings will be described. FIG. 1 is a side view of a vacuum seeder using the present invention, FIG. 2 is a front view of the same, and FIG. 3 is an internal side view of a seed hopper 2 and a sowing drum 3 that employ a seed biting material 1.
FIG. 4 is a side view showing another structure of the seed biting prevention material 1, FIG. 5 is a front view of the inside of the seeding drum 3, and FIG. 6 is a drainage tank 24.
It is a block diagram of.

The overall structure of the vacuum seeder will be described with reference to FIGS. 1 and 2. In FIG. 1, a frame 12 is erected on a transfer device 16 for transferring a seedling raising tray from left to right, a drive motor M is horizontally installed above the forefront portion, and a drive shaft of the drive motor M is provided above. A sprocket 6 is fixed, a tension sprocket 7 is arranged below, and a chain 8 is wound between both sprockets. Then, the seeding drum 3 is provided on the right side of the chain 8, and the pipe shaft 17 described later, which serves as a pivot shaft of the seeding drum 3, is attached to the vertical frame portion 12 of the frame 12.
It is fixed by the drum fixing portion 12b projecting from a and horizontally installed,
The seed drum 3 is fixed, and a sprocket 5 for driving the drum is provided.
b is hung on the chain 8. The drum fixing portion 12b
The vertical position can be adjusted by the vertical adjustment knob 13, and the vertical position of the seeding drum 3 can be adjusted. Furthermore,
A seed hopper 2 is provided behind the sowing drum 3, a suction port 2a at the lower front of the seed hopper 2 is provided along the sowing drum 3, and a hopper fixing shaft 14 vertically hung from a horizontal frame portion 12c is provided in the seed hopper 3. It is arranged by being fitted and fixed to the side plate 15 fixed to the side surface of the. In addition, a position detection switch S configured to be turned on when the seedling raising tray conveyed on the conveying device 16 reaches the drum support frame portion 12a of the frame 12 on the side of the seeding drum 3 at a predetermined position.
Are installed. Thus, on the transport device 16,
Based on the turning on of the position detection switch S, the driving motor M drives the seeding drum 3 to rotate in the direction of the arrow in FIG. 1, and the seeds are adsorbed onto the outer periphery of the seeding drum 3 from the adsorption port 2a of the seed hopper 2. The seeding is carried out on the seedling raising tray that is transported on the transport device 16.

Next, the structure of the seed hopper 2 is shown in FIG.
3 through FIG. In the seed hopper 3, an upper blow pipe 9 for ejecting air in the direction of the arrow in FIG. 1 or FIG. 3 is laterally provided above the adsorption port 3a in order to blow off excessively adsorbed seed. There is. A bottom plate 2b is detachably arranged behind the upper blow pipe 9 so that the seeds in the seed hopper 2 can be smoothly slid into the suction port 2a, and the lower end of the bottom plate 2b, that is, the suction port 2a. A lower blow tube 10 for discharging air in the direction of the arrow in FIG. 1 or FIG. 3 for suspending the seeds in the vicinity of the adsorption port 2a in the seed hopper 2 is horizontally provided at the lowermost part of the. Since the seeds in the seed hopper 2 are likely to stay at the bottom and cause uneven adsorption, the seeds are floated and evenly distributed in the adsorption ports 2a. Air is supplied to the lower blow pipe 10 and the upper blow pipe 9 through an air outlet of a blower 31 described later.

Further, below the lower blow pipe 10, a seed catching prevention material 1 made of an elastic material is projected from the lower end of the bottom plate 2b and pressed against the seeding drum 3. The seed biting prevention material 1 is made of rubber with a lip as shown in FIG. 3, or the rubber material 1a is attached to the lower end of the bottom plate 2b via the spring 1b as shown in FIG. A configuration in which the material 1a is pressed against the seeding drum 3 can be considered. Since the portion pressed against the seeding drum 3 is an elastic material, the seeding drum 3
There is no risk of damaging the seeding drum 3 even if the seedling is rotating. In this way, fine seeds are prevented from entering the gap between the seed drum 3 and the seed hopper 2 below the suction port 2a.

At the lower front part of the seed hopper 2,
The elastic material 11 is arranged so as to be pressed against the seeding drum 3, and the water adhering to the surface of the seeding drum 3 after seeding is scraped off. Further, a seed suction port 2c is opened on the lower side surface, after the seeding work is completed, the bottom plate 2b is pulled out to drop the seeds to the bottom of the hopper, and the seeds are sucked by the air suction force from the swirling seed suction port 2c to collect the seeds. I am doing it.

Next, the structure of the seeding drum 3 will be described with reference to FIGS. 1 to 4. On the surface of the sowing drum 3, suction holes 3a are opened in a dot shape according to the pot position to be placed on the seedling raising tray. On both sides of the sowing drum 3, side plates 4
5, the drum driving sprocket 5b is provided on the outer side of the side plate 5 on the winding side of the chain 8. A shaft hole for inserting the pipe shaft 14 described later is provided in the center of each of the side plates 4 and 5, and bearings 4a and 5a are arranged around the shaft hole.

The internal structure of the seeding drum 3 will be described. On the center line of the seeding drum 3, the pipe shaft 14 is inserted into the shaft holes of the side plates 4 and 5 so as to penetrate therethrough, and is fixed to the frame 9 outside the seeding drum 3 as described above. The drum 3 is horizontally installed so as to be rotatable around the pipe shaft 17.
The interior of the pipe shaft 17 is divided by a partition wall 17a into a water supply section 17b.
The water supply unit 17b is connected to the water supply pipe 18, the suction unit 17c is connected to the suction pipe 19, and the water supply pipe 18 is provided with an electromagnetic valve or a valve that is manually opened and closed. The drainage tank 2 shown in FIG. 7 is connected to a water faucet and the suction pipe 19 is installed below the transfer device 16.
It is connected via 4 to the suction port of the blower 31.

In the pipe shaft 17 as described above, water supply holes 17d and 17d are opened below the water supply portion 17b, and joints 20 and 20 are fitted in the respective water supply hole 17d forming portions. The water supply nozzle 21 is mounted so as to be able to move up and down through the water supply nozzle, and water is discharged from the lower end of the water supply nozzle 21. Further, a spring 22 is provided in each joint 20 to elastically press the water supply nozzle 21 to disseminate the seeding drum. 3 is pressed downward. The width of the lower end surface of the water supply nozzle 21 matches the width of the adsorption holes 3a for one row of the seeding drum 3, and when the seeding drum 3 rotates and the adsorption holes 3a reach below the water supply nozzle 21. The water discharged from the water supply nozzle 21 is discharged from the adsorption hole 3a, and the seed R adsorbed on the adsorption hole 3a is dropped together with the discharged water, and the transport device 1
The seeds are sown in the pot P placed on the seedling raising tray T above 6.

If a chemical tank containing a mixture of chemicals or fertilizers is provided in the middle of the water supply pipe 18 and the chemical liquid is sent into the water supply pipe 18 together with the water, the chemical liquid is also collected together with the water at the time of seeding. Since it will be sprayed with the seeds, the seeds can be grown effectively, insects can be killed, and effective seeding can be performed.

On the other hand, a suction nozzle 23 is projected from a suction hole 17e opened in a suction portion 17c of the pipe shaft 17, and a lower end portion of the suction nozzle 23 is arranged slightly above an upper end of the water supply nozzle 21. . Thus, seeding drum 3
The air inside and the extra water discharged from the water supply nozzle 21 are sucked through the suction nozzle 22 and discharged through the suction pipe 19 through the suction portion 17c. Therefore, the surface of the seeding drum 3 is Outside air is sown from the suction holes 3a.
Since the seeds are sucked in, the seeds are sucked onto the suction holes 3a.

As described above, the drainage tank 24 shown in FIG. 7 is provided in the middle of the suction pipe 19. The drainage tank normally requires an electric pump for sucking water, but the drainage tank 24 in FIG. 7 does not require such a pump and contributes to cost reduction. The configuration will be described. First, the drainage tank 24 includes the upper partition plate 25 and the lower partition plate 26, and the upper chamber 2
4a, a middle chamber 24b, and a lower chamber 24c. Water holes 25a and 26a are opened in the center of both partition plates 25 and 26, respectively, and the float shaft 27a of the float 27 is separated from the upper chamber 24a. It is inserted into the water passage holes 25a and 26a. In the upper chamber 24a, a suction port 2 for connecting a suction pipe 19 extending from the seeding drum 3 to a side surface of the drainage tank 24.
4d, and on the upper surface of the drain tank 24, an exhaust port 24 for exhausting the exhaust pipe 30 communicating with the blower 31.
e is opened. In the middle chamber 24b, the float shaft 27a is fitted into the fitting insertion hole 28a of the upper plug 28,
The upper plug 28 is mounted so as to be able to move up and down, and the fitting insertion hole 28a
At the lower end of the lip seal 2 between the float shaft 27a and
8b. In the lower chamber 24c, a lower plug 29 is fixed to the lower end of the float shaft 27a, and a drain port 24f is provided at the bottom of the drain tank 24.
Is open. At the positions where the upper plug 28 and the lower plug 29 come into contact with the lower ends of the water passage holes 25a and 26a,
The O-rings 25b and 26b are provided respectively.

In the drainage tank 24 having the above-mentioned structure, the seed drum 3 is passed through the suction pipe 19 and the suction port 24d.
Air and water are introduced into the upper chamber 24a. Since air is sucked into the blower 31 through the exhaust pipe 30 from the upper exhaust port 24e, the atmospheric pressure in the upper chamber 24a is reduced and the middle chamber 24
The air in b is sucked into the upper chamber 24a through the water passage hole 25a, and the upper plug 28 is sucked and ascends therewith. As a result, the water passage hole 25a is closed from below by the upper plug 28. An O-ring 25b is provided between the water passage hole 25a and the upper plug 28, and a lip seal 26b is provided between the fitting insertion hole 28a of the upper plug 28 and the float shaft 26a. Water is prevented from leaking from 24a to the inner chamber 24b. In this way, the water passage hole 25a is closed, and the water introduced from the suction port 24d is accumulated in the upper chamber 24a.

As water collects in the upper chamber 24a, the float 27 rises with the water level, and along with that, the lower plug 29 at the lower end of the float shaft 27a rises in the lower chamber 24c and reaches the O-ring 26b of the water passage hole 26a. The lower plug 29 comes into contact with the water passage 26a, and the lower plug 29 closes the water hole 26a from below.
Still further, water is accumulated in the upper chamber 24a, and the water pressure is kept in the middle chamber 24b.
When the pressure becomes higher than the pressure of the air sealed inside, the upper plug 28 closing the water passage hole 25a descends, and as a result, water moves from the water passage hole 25a into the middle chamber 24b. Upper chamber 2
In 4a, since the water level is lowered, the float 27 is also lowered and the lower plug 29 is also lowered, so that the water passage hole 26a is also opened, water is moved from the middle chamber 24b to the lower chamber 24c, and the bottom drain port 24f More water is drained. In this way, the water and air in the seeding drum 3 can be separated and discharged without using power.

The sowing drum 3 is rotationally driven intermittently by driving the driving motor M based on the ON of the position detection switch S as described above, and the sowing drum 3 is rotated at one rotation speed. By setting the passage speed to one, it is possible to automatically stop sowing and prevent excess seeds from dropping to positions other than the pot on the seedling raising tray.

[0020]

Since the present invention is constructed as described above, it has the following effects. That is, in the vacuum seeding machine, since the seed biting prevention material made of an elastic material is provided between the bottom plate of the seed hopper and the sowing drum, even when sowing fine seeds, the bottom plate is slid down to form a bottom plate. The seeds do not enter the gap between the seed drum and the seed drum below the suction port from the lower end, and it is possible to prevent problems or damage to the drive of the seed drum.

[Brief description of drawings]

FIG. 1 is a side view of a vacuum seeder using the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an internal side view of a seed hopper 2 and a sowing drum 3 that employ a seed biting material 1.

FIG. 4 is a side view showing another configuration of the seed biting prevention material 1.

5 is an internal front view of the seeding drum 3. FIG.

FIG. 6 is a configuration diagram of a drainage tank 24.

[Explanation of symbols]

 1 Seed biting prevention material 2 Seed hopper 2a Adsorption port 2b Bottom plate 3 Seeding drum

Claims (1)

[Claims] 1. A vacuum sowing machine in which a seed hopper is provided behind a rotating seeding drum, and a seed is adsorbed on the surface of the seeding drum through a suction port of the seed hopper to sow the seed, and a bottom plate at the bottom of the suction port of the seed hopper is used. A seed biting prevention mechanism for a vacuum seeding machine, characterized in that an elastic member is projectingly provided at a lower end and a tip of the elastic member is pressed against the seeding drum.