JPH0520043B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a seeding machine that sows agricultural crop seeds at predetermined positions in the soil at regular intervals, and a tape made of a water-soluble material or a material that decomposes the seeds in the soil. This invention relates to a suction transport device for taking out seeds from a hopper for use in a seed string manufacturing device that manufactures seed strings wrapped at regular intervals.

(Prior Art) FIG. 4 shows a sectional view and a plan view of a seed string manufacturing device as an example using a conventional seed carrying device.

In the figure, an endless belt 2 provided with a number of holes 1 at regular intervals is run at a constant speed over the bottom 4 of a hopper 3 in which seeds 5 are stored.

The tape 6 is run below the position where the endless belt 2 is pulled out from the hopper 3, and the seeds 5 fitted into the holes 1 of the endless belt 2 are successively dropped onto the tape 6. has been done.

(Problems to be Solved by the Invention) As mentioned above, the conventional seed transport device utilizes the natural fall of seeds due to their own weight to place and transport seeds by passing them through holes provided at predetermined positions. It is. Therefore, even if the seeds to be handled are of the same type, the shape, size, weight, etc. of each seed pass through the hole from different places, and the time it takes to hit the hole and leave the hole varies widely. . Therefore, there is a risk that the seeds may be missing at a certain pitch or may not fall at a predetermined position, so there is a limit to the rotational speed of the endless belt, and there is a problem that the seeds cannot be delivered regularly at high speed.

An object of the present invention is to solve this problem with a novel structure, and to provide a seed suction and transport device that can transport seeds of the same type accurately at regular intervals and at high speed.

(Means for Solving the Problem) In order to achieve the above object, the seed suction and discharge device according to the present invention includes: a rotating drum whose cylindrical surface contacts and rotates a group of seeds accommodated in a hopper; an interior of the rotating drum; a pipe-shaped central shaft having an opening at the center; an exhaust device coupled to the central shaft for supplying negative pressure to the internal space of the rotating drum; a negative pressure cutoff valve that is released at a position, the rotary drum includes a cylindrical ring-shaped belt in which a series of suction holes are provided, and the negative pressure cutoff valve has an elastic a roller rotatably mounted on a lever pivotally fixed to a support arm provided on the central shaft; the lever is provided with a spring that presses the elastic roller against the inner circumferential wall of the ring-shaped belt; The rotary drum is configured to rotate following the belt of the rotary drum.

(Example) The present invention will be described in more detail below with reference to the drawings and the like.

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 2 is the left side of the embodiment shown in Figure 1 (partially broken)
It is a diagram.

The hopper 13 that accommodates the seeds 5 is arranged so that the seed group contacts the ring-shaped belt 12.
The ring-shaped belt 12 is made of a thin plate, and as shown in FIG. 3, a large number of suction holes 11 having a diameter smaller than the diameter 8 of the seeds 5 are continuously opened.

Further, the ring-shaped belt 12 contacts, at its rim, two discs 14 and 15 having two opposing rims, and the ring-shaped belt 12 and the two discs 14 and 15 form a rotating drum.

This rotary drum is rotatable, and the disk 14 is rotated by a driving roller 17 attached to a motor 16, so that the ring-shaped belt 12 and another disk 15 are also rotated, and the fixed shaft 18 is rotated. The entire rotating drum rotates as a unit around the axis.

Although the structure of the ring-shaped belt 12 is not particularly shown in the figure, it is removable and comes in a variety of sizes with different diameters and pitches of the suction holes 11 depending on the application, so that it can be freely selected and replaced. , making it easy to install.

The fixed shaft 18 is a hollow tube with one end closed, and is provided with an air circulation hole 19 that communicates between the hollow inside and the outside of the tube.

A vacuum source, which is an exhaust device such as a vacuum pump, is connected to the other end of the rotating shaft 18, and the vacuum source connects the ring-shaped belt 12 and the disc 14 through the air circulation hole 19 and the hollow part of the rotating shaft 18. , 15, the air inside the rotating drum is sucked to form a negative pressure chamber.

Further, a support arm 20 is fixed to the fixed shaft 18, and a rotary roller 21 is attached to the tip of the support arm 20 as a negative pressure cutoff valve.

The support arm 20 includes a hinge structure 22 and a spring 2.
3, the rotating roller 21 is always pressed against the inner surface of the ring-shaped belt 12, and the roller surface is constantly in close contact with the inner surface of the belt even while the ring-shaped belt 12 is rotating, blocking the suction hole 11 that has just arrived at that position. ,
It serves to cut off the negative pressure inside the rotating drum.

Note that the ring-shaped belt 1 of this rotating roller 21
A suitable material for the surface in contact with 2 is soft rubber or slightly foamed sponge.

Further, a cover 24 for allowing air to enter from the suction hole 11 is attached between the lowermost part of the ring-shaped belt 12 and the hopper 13.

Next, the operation will be explained.

First, seeds 5 are placed in the hopper 13, and when the rotary drum is rotated by the motor 16 while the air inside the drum is sucked by the vacuum source, the seeds 5 are placed in the suction hole 11 provided in the ring-shaped belt 12, However, since the ring-shaped belt 12 is rotating while contacting the seeds 5 in the hopper 13, the attracted seeds 5 are separated from the other seeds and are moved together with the ring-shaped belt 12 as shown in FIG. It moves in the rotational direction of the rotating drum shown by the arrow P inside.

When the seeds 5 move and come to a position where they face the rotating roller 21 which is rotating while being pressed against the ring-shaped belt 12 from the inside, with the ring-shaped belt sandwiched therebetween,
Since the inside of the suction hole 11 that had been sucking the seeds 5 up until now is blocked by the rotating roller 21, it is cut off from the negative pressure inside the rotating drum and the suction hole 11 loses its suction force, so the seeds 5 are sucked at that position. 5 and the centrifugal force given by the rotation of the drum, it separates from the ring-shaped belt 11.

The position at which the seeds 5 leave the ring-shaped belt is not shown when fixing the fixed shaft 18, but since the fixing angle can be adjusted in the rotation direction of the rotating drum, the position can be changed freely. .

In addition, since the suction holes 11 are arranged on the circumference of the ring-shaped belt, the ring-shaped belt can be made sufficiently thin in terms of strength, and the thickness is about 0.2 mm, so the orifice of the suction holes 11 can be There is no need to worry about clogging due to dirt, dust, etc.

(Effects of the Invention) The seed suction and carry-out device according to the present invention uses the inner space of a rotating drum composed of a ring-shaped belt and two discs as a negative pressure chamber, and has a series of many suction holes provided in the ring-shaped belt. Seeds in contact with the drum are sequentially attracted by negative pressure, and when the seeds move as the rotating drum rotates and reach a predetermined position, the suction hole is blocked from the inside to cut off the negative pressure and the seeds are released. By doing this, instead of letting the seeds pass through the holes provided in the belt as in the past, the seeds are simply attracted to the suction holes using negative pressure, so the seeds do not get stuck in the holes, and the seeds do not pass through the rotating drum. When separating from the seed, the seeds were previously subjected to a suction force due to negative pressure that was stronger than the sum of their own weight and centrifugal force, but as the suction force quickly disappears at a certain position, the rotary drum is rotated at high speed. This also has the effect of ensuring that the seeds are carried out at accurate positions and pitch intervals without being lost.

Furthermore, this position can be finely adjusted by adjusting the fixing shaft as described above.

In addition, since the ring-shaped belt can be made sufficiently thin due to its structure, there is no need to process orifices for the suction holes, and there is no fear of clogging due to dirt or dust mixed in with seeds, etc., even when used for a long time.

[Brief explanation of the drawing]

FIG. 1 shows a main part of an embodiment according to the present invention, and is a front (cross-sectional) view taken along the line - in FIG. 2 is a left side (partially cut away) view of the embodiment of FIG. 1. FIG. FIG. 3 is a perspective view showing an example of a ring-shaped belt used in the embodiment of FIG. 1. FIG. 4 is an explanatory diagram showing the main parts of a seed string manufacturing device using a conventional seed carrying device. 1... Hole, 2, 12... Ring-shaped belt, 3, 13
... Hopper, 4... Hopper bottom, 5... Seed, 6... Running tape, 11... Suction hole, 14, 15... Disc, 16
...Motor, 17...Drive roller, 18...Fixed shaft, 1
9...Air circulation hole, 20...Support arm, 21...Rotating roller, 22...Hinge structure, 23...Spring, 24
…cover.

Claims (1)

[Scope of Claims] 1. A rotating drum whose cylindrical surface contacts and rotates a group of seeds housed in a hopper, a pipe-shaped central shaft having an opening inside the rotating drum, and the rotating drum coupled to the central shaft. A seed suction and conveyance device comprising: an exhaust device that supplies negative pressure to the internal space of the rotary drum; and a negative pressure cutoff valve that releases the seeds sucked and conveyed through each suction hole provided in the rotary drum at a fixed position. , the rotating drum includes a cylindrical ring-shaped belt having a series of suction holes, the negative pressure cutoff valve is an elastic roller, and the lever is pivoted to a support arm provided on the central shaft. is rotatably installed in
The seed suction and carry-out device is configured such that the lever is provided with a spring that presses the elastic roller against the inner circumferential wall of the ring-shaped belt, and the elastic roller is rotated in accordance with the belt of the rotating drum.