JP2003079226A - Chaff sieve structure of thresher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chaff sieve of a thresher with which grain scattering by fins of the chaff sieve is controlled and shaking separation can excellently be carried out. SOLUTION: In the thresher 1 in which a material threshed by a threshing cylinder 3a is shaken and separated by a shaking and separating body 2 having the chaff sieve 6 installed in an air duct 4b for separation, this chaff sieve structure for the thresher comprises a plurality of the fins 7 constituting the chaff sieve 6 of the shaking and separating body 2 or the surfaces of the fins formed from a cushioning member 8 for reducing repulsion of grain.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chaff sheave structure mounted on a rocking sorting body of a thresher mounted on a combine or the like.

[0002]

2. Description of the Related Art Conventionally, a thresher for threshing a culm with a handling cylinder and receiving the threshing with an oscillating sorter having a chaff sheave for oscillating sorts has a chaff sheave with a leaking interval between fins of a horizontally long blade. The fins are arranged in a plurality of rows, and the fins are provided so that the leakage selection angle can be adjusted.

[0003]

The chaff sheave constituting the swing selecting body having the above-mentioned conventional structure has fins formed of a metal plate, and the fins have a hard surface and a high coefficient of restitution. When the grain collides with this hard surface, the grain repels greatly and is blown away for a long distance, and this reaches the dust exhaust duct by the sorting wind and is directly discharged outside the machine as a third grain scattered grain. It is easy to use and has the disadvantage of losing grains.

This scattered grain causes a large loss of several percent or more of the whole grain when the fin is adjusted to a gentle inclination angle especially when the amount of grain removed is small, and the fin on the metal surface has a large loss. Since wet grain removal is also selected, there is a problem that corrosion such as rust and abrasion are likely to occur and durability is poor.

[0005]

The chaff sheave structure of the threshing machine according to the present invention is swing-sorted by a swing sorter 2 having a chaff sheave 6 installed in the sorting air passage 4b for threshing that has been threshed by the handling barrel 3a. In the threshing machine 1,
The plurality of fins 7 forming the chaff sheave 6 are formed by the cushioning member 8 for reducing the repulsion of the grain.

Further, in the thresher 1 in which the thresher that has been threshed by the handling cylinder 3a is swing-sorted by the swing sorting body 2 having the chaff sheave 6 installed in the sorting air passage 4b, the swing sorting body 2 is used.
Is characterized in that a layer of elastic cushioning member 8 such as urethane rubber material is formed on the surfaces of the plurality of fins 7 constituting the chaff sheave 6.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a thresher mounted on a combine in which a chaff sheave structure according to the present invention is installed on a swinging and sorting body 2. This thresher 1 has a similar arrangement structure to a conventional device. A handling barrel 3a for rotating and threshing culms and a receiving net 3b are provided inside a handling chamber 3 provided with a feed chain (not shown) on the upper part of the machine casing 1a.

A swinging sorting body 2 having a structure described later is supported so as to be swingable in the front-back direction in a sorting air passage 4b formed by a blower fan 4 and a dust-exhausting fan 4a arranged below it in the front-rear direction. Then, the first gutter 5 that collects the selected grain (first item) below the rocking sorter 2 and the second product that needs re-sorting are reduced and transferred to the rocking sorter 2. Second gutter 5a
And are installed.

The rocking sorting body 2 has a non-perforated corrugated plate-shaped sorting plate 52 in the upper stage of the sorting structure framed by the first and second flow plates 50 and 51. The chaff sheave 6 according to the present invention is provided in the front-rear direction, and the sorting plate 5 is provided in the lower stage.
The second sorting plate 53 and the crimp net 55, which have substantially the same shape as 2, are provided close to the upper end side of the first flow plate 50, and the straw rack 56 is provided from the first flow plate 50 side to the upper end of the second flow plate 51. It is configured to be installed close to the side.

As shown in FIGS. 2 to 4, the chaff sheave 6 has a plate shape in which a plurality of fins 7 each having a vane plate shape similar to the conventional one are arranged in a plurality of rows with a leakage gap 6a. The leakage selection angle is adjustable so that the surface angle can be adjusted between a steep slope and a gentle slope.

With this configuration, as shown in FIG. 2, when the flow rate of grain removal is large, the leakage sorting angle is set to a steep downward angle to promote the leakage, so that the sorting air passage 4 on the side of the dust-exhaust fan 4a.
It prevents the transfer and scattering of grains to the b side.

When the flow rate of threshing is small, the leakage selection angle is adjusted to a gentler angle as shown in FIG. We are able to make high selections.

Further, as shown in FIG. 4, the fin 7 of this embodiment is formed of a thin metal plate or a plastic plate in the shape of a vane plate, and the upper and lower edges thereof are bent to provide a transfer surface 7a also serving as a reinforcement. At least the surface of the fin body 7b is made of a cushioning member 8 made of a urethane rubber material having a low elastic coefficient and abrasion resistance or a plastic material having elasticity.
The surface is covered by means such as adhesion, sticking or coating.

The oscillating sorter 2 having the chaff sheave 6 configured as described above receives the threshed grains that have been threshed in the handling chamber 3 by the sorting plate 52 and the first half side of the chaff sheave 6, and swings and transfers them to the rear side. The grain is removed from the gaps formed between the fins 7 of the chaff sheave 6 by loosening and sorting the second sorting plate 53.
And it is made to leak on the crimp net 55.

The grain that has leaked through the crimp net 55 is
The grain removal from the crimp net 55 to the straw rack 56 side through the most drainage plate 50 to the gutter 5 and outside the machine is performed by wind sorting and rack sorting. It is received and collected by the second gutter 5a through the second grate plate 51 and transferred to the process of re-sorting, and the debris that exceeds the upper end of the second gutter 5a is sucked by the dust removal fan 4a as the third item. It is discharged outside the aircraft.

At this time, the chaff sheave 6 of the swing selecting body 2
Since the surface of each fin 7 is covered with the cushioning member 8 as shown in FIG. 4 and FIG. 5, even if the grain 7 directly contacts the surface of the fin 7 that swings, this cushioning member 8 The cushioning properties of the grain reduce the repulsion of the grain and cause it to fly at a shorter distance than the conventional ones, which also prevents the scattered grain from being blown off by the sorting wind. It is possible to reduce the number of grains transferred to the dust passage 4b side.

Therefore, especially when the amount of grain removed is small, when the grains are oscillated and sorted by the chaff sheave 6 in which the fins 7 are adjusted to a gentle inclination angle as shown in FIG. Since the repulsion distance is short even if the transfer surface 7a is brought into contact with the transfer surface 7a, it is possible to extremely reduce the number of scattered grains mixed in the third material, and thereby the transfer surface 7a can be laid down to be large. , The fin body 7b of the fin 7
It is characterized in that the metal plate can be thinned while being reinforced to make it rigid and lightweight, and that the transferability of grain loss on the chaff sheave 6 can be improved.

With this configuration, as shown in FIG. 5, the fin 7 can also be formed with a plurality of transfer surfaces 7a at the upper end of the fin main body 7b that repel the grains in the transfer direction in a downward staircase shape. Become. Then, in this case, there is an advantage that the transfer efficiency can be further improved and highly accurate sorting can be efficiently performed without flying the grains far by the plurality of transfer surfaces 7a coated with the buffer member 8. .

The fins 7 in the illustrated example are shown in the form in which the surface of the fin main body 7b made of a metal plate is coated with the cushioning member 8, but the present invention is not limited to this, and urethane rubber, plastic, or the like may be used. It can be configured by integrally molding the cushioning member 8 itself such as an elastic material so as to form the fin 7.

[0021]

As described above, according to the chaff sheave structure of the threshing machine of the present invention, the swinging sorting body 2 having the chaff sheave 6 installed in the sorting air passage 4b to thresh the grain threshed by the handling barrel 3a. In the threshing machine 1 for swing selection, the surface of the plurality of fins 7 forming the chaff sheave 6 of the swing selection body 2 is formed with a buffer member 8 for reducing the repulsion of the grain.

Therefore, the chaf sheave 6 is swinging.
Since the surface of the grain contacting the fin 7 or the grain itself is a cushioning member and the repulsion is reduced, swing sorting with less scattering of the grain out of the machine can be performed.

Further, since the fin body 7b of the fin 7 is formed of a thin metal plate or the like and the surface of the fin body 7b is covered with the cushioning member 8 such as urethane rubber or plastic, the fin having the cushioning member 8 is formed. 7 can be manufactured with a simple structure, and the durability of the fin 7 can be improved.

Further, if a plurality of transfer surfaces 7a for repelling the grains in the transfer direction are formed on the upper ends of the fins 7 in a downward staircase shape, the repulsion of the grains can be reduced and the transfer efficiency of the grain removal can be improved. You can

[Brief description of drawings]

FIG. 1 is a side sectional view of a thresher.

FIG. 2 is a side view of a chaff sheave with a fin having a steep inclination angle.

FIG. 3 is a side view of a chaff sheave with fins having a gentle inclination angle.

FIG. 4 is a side sectional view of a fin.

FIG. 5 is a side sectional view showing another embodiment of the fin.

[Explanation of symbols]

1 Thresher 2 Swinging Sorting Body 3 Handling Room 3a Handling Body 4b Sorting Air Path 6 Chaf Sheave 7 Fins 7a Transfer Surface 7b Fin Body 8 Buffer Member

Claims (2)

[Claims] 1. A thresher (1) in which threshing that has been threshed by a handling cylinder (3a) is oscillated and sorted by an oscillating sorting body (2) having a chaff sieve (6) installed in a sorting air passage (4b). ,
A chaff sheave structure of a threshing machine, characterized in that a plurality of fins (7) constituting the chaff sheave (6) of the swing selection body (2) are formed by a buffer member (8) for reducing the repulsion of the grain. 2. A thresher (1) in which threshing dehulled by a handling cylinder (3a) is oscillated and sorted by an oscillating sorting body (2) having a chaff sheave (6) installed in a sorting air passage (4b). ,
A threshing machine characterized in that a layer of an elastic cushioning member (8) such as urethane rubber material is formed on the surfaces of a plurality of fins (7) constituting the chaff sheave (6) of the swing selecting body (2). Chaff sheave structure.