JP2001314822A - Screening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screening machine and a screening method both suitable for screening lightweight minute substance. SOLUTION: This machine removes inferior goods from an object to be screened by irradiating the object (1) with rays of light, detecting the rays of light reflected by the object, and operating a removal apparatus (7, 8) according to a detection signal and is characterized in that the removal apparatus (7, 8) for removing inferior goods from the object is a type of removing inferior goods by sucking. The surface of a belt (2) is colored in a specified color according to the kind of the object so as to satisfy the function as a background.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sorting machine,
The present invention relates to a sorting method and an apparatus for sorting lightweight fine substances such as crushed laver and powdery medicine.

[0002]

2. Description of the Related Art A color sorter, which conveys grains such as rice and red beans by a belt, projects light, and sorts ordinary color grains from black spots and colored grains based on the amount of reflected light, has been conventionally used. More known. One example of such a color sorter is shown in FIG.
Shown in In FIG. 1, an object to be sorted 1 is supplied onto a belt 2 from a hopper (not shown), and is conveyed in a horizontal direction by the belt 2 and then passed through a photoelectric sorting unit provided adjacent to an end of the belt. Good products are sorted out. The photoelectric sorting unit mainly includes a light source 3, a background 4, a light receiving element 5, and an ejection nozzle 6. The background 4 is generally used for increasing the sorting accuracy in a color sorter. Usually, the background 4 has the same color as the color of the granular product to be sorted, so that defective products can be optically more clearly identified. It is made to be distinguishable. In this color sorter, grains are passed above the background, and at that time, the amount of reflected light from the background and the grains is detected by a light-receiving element, and the amount of light is compared with a reference amount of light to be constant. When the above difference occurs, the air gun is operated to emit an air jet from the injection nozzle 6, and defective grains such as black spots and colored grains are blown off and sorted out.

[0003]

However, the structure and the exclusion method of the above-mentioned sorter are not suitable for sorting lightweight fine substances such as crushed laver and powdery medicine. That is, since light and fine substances such as pulverized seaweed and powdery chemicals are lightweight and fine, they receive air resistance immediately after leaving the belt, and are not thrown out in a fixed orbit and dispersed to reach a good-quality container. Absent. In addition, since defective products are also dispersed by air resistance, it is difficult to accurately remove them with an air gun. Therefore,
It is extremely difficult to accurately sort light and fine substances by a structure and a sorting method like a conventional sorter.

[0004] In view of the above, it is an object of the present invention to provide a sorting machine and a sorting method suitable for sorting lightweight fine substances.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, in a sorting machine and a sorting method according to the present invention, an excluding device for excluding a defective product in a sorting target object is eliminated by sucking the defective product. Format. Further, in the sorting apparatus of the present invention, it is preferable that the sorting object is transported by a belt, and that the rejecting device is disposed above a sorting object transport surface of the belt.

[0006] Further, in the sorting machine of the present invention, the background of the conveyor belt itself is eliminated, so that there is no need to provide a separate background.
The light receiving element can be arranged above the belt so as to aim only at the sorting object conveying surface of the belt. In this case, the surface of the belt is colored in a predetermined color according to the type of the object to be sorted so as to satisfy the function as the background.
Coloring can be performed by painting, plating, or other general coloring methods, and a film or cloth of a predetermined color may be wound. Further, a cleaning member such as a brush or a scraper may be disposed in contact with the belt, so that dust or the like can be scraped off when the belt rotates so that the belt can be automatically cleaned.

[0007] The rejection device is preferably provided with a nozzle corresponding to the shape and size of the object to be sorted, and is preferably disposed immediately downstream of the place where the light receiving element is disposed. Also, the rejection device can be mounted with an air gun upward so that the nozzle can generate an air jet in a direction for sucking the object to be sorted. Guns can be used.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a schematic configuration diagram of an embodiment of the sorting machine according to the present invention.

In FIG. 2, a sorting object 1 is supplied onto a belt 2 from a hopper (not shown), is conveyed horizontally by the belt 2, and is sorted by a sorting section provided above the belt. Only is further conveyed by the belt and discharged from the end of the belt into the non-defective product container provided adjacent to the end of the belt. The sorting unit mainly includes the light source 3, the light receiving element 5, and the air gun 8 having the nozzle 7. In the sorting section, the light source 3
Are irradiated on the object 1 to be sorted, and the light reflected by the surface of the object 1 is detected by the light receiving element 5 and corresponding electric signals are generated. If the difference between the electric signal and the electric signal corresponding to the reference light amount is larger than a predetermined value, the electric signal is determined to be defective, the air gun 8 is operated, and the object determined to be defective is determined. Is sucked through the nozzle 7. In this way, good products and defective products are sorted out.

The light receiving element 5 is arranged above the belt,
The object is disposed so as to detect the reflected light from the object to be sorted and to be aimed at the object to be sorted conveyed on the belt. The nozzle 7 is disposed immediately downstream of the light receiving element 5 so as to accurately remove a sorting object determined to be defective by the light receiving element 5.

In the present apparatus, the belt 2 itself serves as a background. That is,
The surface of the belt is colored in a predetermined color according to the type of the object to be sorted so as to satisfy the function as a background. With such a configuration, there is no need to provide a background separate from the belt as in the prior art sorter. As described above, it is difficult to sort a material to be sorted while the material to be sorted is light and fine, as described above, and it is desirable to sort while the material is being transported by a belt. In this case, if the background is provided separately from the belt, it is necessary to arrange the light receiving element not only for the object to be sorted but also for the background, which has to be a complicated structure. However, by setting the belt itself as the background, the light receiving element only needs to be arranged so as to aim on the belt.

The air gun 8 is an air gun capable of emitting an air jet for blowing off defective products in a conventional sorting machine, but is arranged upward as shown in the figure. Thus, when an air jet is fired by the air gun, an air suction flow is generated in the nozzle 7, and the object to be sorted is sucked through the nozzle 7. In particular, light and fine objects to be sorted such as ground laver can be easily sucked by a relatively weak suction flow. The output of the air gun can be changed so as to generate a suction force, that is, an air jet according to the type of the object to be sorted. The nozzle is also
It can be changed as appropriate depending on the size, weight, and the like of the sorting object. Further, in this embodiment, an air gun is employed, but a suction device such as a suction pump may be directly connected to the nozzle.

[0013]

According to the sorting machine of the present invention as described above, even if the material to be sorted is a light and fine substance, it can be reliably sorted without being dispersed by air resistance. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a conventional belt type sorter.

FIG. 2 is a schematic configuration diagram of a sorting machine of the present invention.

[Explanation of symbols]

1 Sorted object, 2 belt, 3 light source, 5 light receiving element, 7 nozzle, 8 air gun

Claims (7)

[Claims] 1. A sorting machine for irradiating a conveyed sorting object with a light beam, detecting a light beam from the same sorting object, and operating a rejection device based on a detection signal, thereby eliminating a defective product in the sorting object. A sorter characterized in that the rejecting device for rejecting defective products in the sorted product is of a type that rejects the rejected products by suctioning the rejected products. 2. The sorter according to claim 1, wherein the object to be sorted is a lightweight fine substance. 3. The sorting machine according to claim 1, wherein the sorting object is conveyed by a belt. 4. The sorting machine according to claim 3, wherein the rejecting device is arranged above a surface of the belt on which a material to be sorted is transported. 5. The sorter according to claim 1, wherein the rejecting device is configured to control an air gun for emitting an air jet by an air jet fired by the air gun. A sorting machine configured by arranging so as to generate an airflow in a direction of sucking a defective product in a sorting object. 6. The sorting machine according to claim 3, wherein the belt is colored in a predetermined color determined by the type of the sorting object so as to act as a background. Is a sorter. 7. A sorting method for irradiating an object to be conveyed with a light beam, detecting a light beam from the object to be conveyed, and operating a rejection device based on a detection signal to eliminate defective products in the object to be sorted. A method of sorting, wherein the defective product is removed by suctioning the defective product in the sorted product.