JP7023765B2 - Foreign matter remover and foreign matter remover - Google Patents

Description

The present invention relates to a foreign matter removing device and a foreign matter removing device, and more particularly to a foreign matter removing device and a foreign matter removing device suitable for removing foreign matter of seaweed.

Seaweeds such as mozuku seaweed, hijiki seaweed, and wakame seaweed have pebbles entwined with seaweed, dead shrimp and other insects, and foreign substances floating on the surface of the sea. Since these foreign substances have a great influence on the quality of seaweed, it is necessary to remove the foreign substances. Conventionally, this foreign matter removal process has been performed manually by the visual inspection of the worker, but it is efficient to manually remove all foreign matter because the burden on the worker is heavy and a considerable amount of work time is required. Is bad.

Therefore, a method of mechanically removing foreign matter by using a foreign matter removing device is performed. Although it is difficult to completely remove foreign matter by this method, it is possible to reduce the burden on workers and improve work efficiency by reducing the amount of foreign matter mixed in to some extent before manually removing the foreign matter. It is useful.

As a method of mechanically removing foreign substances, for example, a method of transporting seaweeds while sandwiching them by nets installed above and below and spraying high-pressure water from above and below (Patent Document 1), and a method of invading seaweeds. By placing seaweeds on a mounting part with a large number of gaps formed so that foreign matter can enter but the fluid can pass through, and supplying the fluid with a predetermined momentum from above it, A method of allowing only foreign matter to enter the gap (Patent Document 2), or a plate-shaped foreign matter removing member constituting a transport path for foreign matter removal target is formed with some irregularities at a predetermined angle and is subjected to vibration to remove the foreign matter. (Patent Document 3) has been proposed in which a foreign matter is dropped into a groove and deflected from a transport path by transporting the foreign matter.

However, these methods have problems such as the seaweed being entangled in the net, being clogged in the gaps and grooves, and being discharged together with foreign substances through the gaps and grooves, especially in the elongated seaweeds such as mozuku. It was easy to occur, and a satisfactory effect was not obtained in terms of work efficiency and yield.

Further, Patent Document 4 is a foreign matter removing device for removing foreign matter contained in the raw grass of seaweed and sending it to a subsequent step, and the raw grass is used as a mixed solution of seawater, salt water, water or the like. A raw grass tank to be stored, a container in which a part of the raw grass is immersed in the mixed solution to separate the raw grass in the raw grass tank from foreign matter and sucked, and the container is above the water level of the mixed solution. Described is a foreign matter removing device for seaweed raw grass, which comprises a backwashing means for backwashing the raw grass in the direction opposite to the suction direction of the raw grass when it is moved. However, this foreign matter removing device cannot solve the problem that foreign matter is easily clogged in the gap.

Japanese Unexamined Patent Publication No. 2000-0000024 Japanese Unexamined Patent Publication No. 2006-191829 Japanese Unexamined Patent Publication No. 2011-02588 Japanese Unexamined Patent Publication No. 11-285365

The present invention has been improved in view of the above-mentioned problems in the past, and an object of the present invention is to provide a foreign matter removing device capable of removing foreign matter more efficiently and a foreign matter removing device using the foreign matter removing device. It is something to do.

In order to solve the above problems, the present inventors have conducted extensive research, and as a result, by using a foreign matter removing device in which two or more wire screens having a specific structure are stacked, problems such as clogging are less likely to occur. The present invention was completed by repeating research based on this finding.

That is, the foreign matter removing device of the first invention of the present application is a foreign matter removing device in which a wire screen in which a large number of wires having a polygonal cross-sectional shape are arranged at predetermined intervals is stacked in two or more stages in the front-rear direction, and is a polygonal wire. The feature is that the corners of the wire are arranged on the front side.

The foreign matter removing device of the second invention of the present application is characterized in that, in the first invention of the present application, the wires of adjacent wire screens in the front-rear direction intersect at a predetermined angle in the longitudinal direction of the wire.

The foreign matter removing device of the third invention of the present application is a wedge wire screen in which the cross-sectional shape of the wire is an isosceles triangle in the first or second invention of the present application, and the apex of the isosceles triangle is arranged on the front side. It is a feature.

The foreign matter removing device of the fourth invention of the present application is characterized in that, in the second or third invention of the present application, the crossing angle is 10 to 25 °.

The foreign matter removing device of the fifth invention of the present application is characterized in that, in any one of the first to fourth inventions of the present application, the foreign matter removing object is a seaweed.

The foreign matter removing device of the sixth invention of the present application is characterized in that the seaweed is a mozuku seaweed in the fifth invention of the present application.

The foreign matter removing device of the seventh invention of the present application includes a lower water tank storing a fluid, an upper water tank containing a fluid containing a foreign matter and a foreign matter removing object, a fluid feeding means, and foreign matter of the first to sixth inventions. It has a removal device, a first recovery basket, and a second recovery basket, and feeds fluid from the lower water tank to the upper water tank by a feeding means, and contains foreign matter discharged from the upper water tank and foreign matter removal objects. After passing the fluid through the foreign matter removing device, the foreign matter is collected in the first collection cage, the foreign matter removal target is collected in the second collection cage, and the fluid is returned to the lower water tank.

According to the first invention of the present application, when a liquid containing a foreign substance and a foreign matter removing object is flowed toward the wire screen of the first invention of the present application, the relatively elongated foreign matter removing object is a polygonal corner portion of the wire. Becomes a resistance and is difficult to enter the gap (slit) between the wires, but foreign matter skillfully slips through the polygonal corners of the wire and enters the slit between the wires. In this way, it is possible to separate the foreign matter from the foreign matter removal object having a relatively elongated shape.

According to the second invention of the present application, the wires of the adjacent wire screens intersect at a predetermined angle in the longitudinal direction of the wire, so that the relatively elongated foreign matter removing object is a slit between the wires. Since the resistance to the movement to enter is increased, it is possible to improve the separation efficiency between the foreign matter removing object having a relatively elongated shape and the foreign matter.

According to the third invention of the present application, the foreign matter is guided into the slit between the wires along the equilateral sides of the isosceles triangle with the apex of the isosceles triangle of the wedge wire screen as a branch point. As a result, it is possible to improve the separation efficiency between the foreign matter removing object having a relatively elongated shape and the foreign matter.

According to the fourth invention of the present application, since the crossing angle of the wire is appropriate, it is possible to further improve the separation efficiency between the foreign matter removing object having a relatively elongated shape and the foreign matter. When the crossing angle is smaller than 10 °, the resistance to the movement of the relatively elongated foreign matter removing object to enter the slit between the wires is reduced, which is not preferable. On the other hand, when the crossing angle is larger than 25 °, the resistance to the movement of foreign matter to enter the slit between the wires increases, which is not preferable.

According to the fifth invention of the present application and the sixth invention of the present application, foreign substances contained in seaweeds or mozuku seaweeds can be efficiently separated.

According to the seventh invention of the present application, foreign matter adhering to a relatively elongated foreign matter removing object can be efficiently removed.

FIG. 1 is a schematic configuration diagram of an example of a foreign matter removing device provided with the foreign matter removing device of the present invention. 2A and 2B are views for explaining the installation angle of the foreign matter removing device of the present invention with respect to the horizontal plane, and FIG. 2C is another example of installing the foreign matter removing device 7 with respect to the slope 6 shown in FIG. It is a schematic block diagram which shows the embodiment. 3 (a) and 3 (b) are views for explaining the cross-sectional shape of the wire of the wire screen. 4 (a) and 4 (b) are views illustrating the direction of the wedge of the wedge wire. 5 (a), (b), and 5 (c) are diagrams illustrating the intersection of wires in a two-stage wire screen. FIG. 6 is a schematic diagram of a foreign substance (small shrimp) used in the foreign substance removal test.

Hereinafter, embodiments of the present invention will be described, but it goes without saying that various modifications and modifications can be made without departing from the technical scope of the present invention.

The foreign matter removing device of the present invention pays attention to the difference in shape and size between the foreign matter to be removed and the foreign matter to be removed, and the foreign matter removing object does not pass through, but the foreign matter passes through a slit (with a wire). A wire screen having a gap between the wires) separates the foreign matter removal object from the foreign matter. As will be described later, the foreign matter removing device of the present invention is formed by stacking two or more wire screens in which a large number of wires having a polygonal cross-sectional shape are arranged at predetermined intervals in the front-rear direction.

The wire constituting the wire screen is not particularly limited as long as the cross-sectional shape is polygonal. The specific cross-sectional shape may be, for example, any shape such as a triangle, a square, a rectangle, a trapezoid, a rhombus, and a pentagon, but a shape having at least one acute angle is preferable, and an isosceles triangle is particularly preferable.

The reason why the cross-sectional shape of the wire is polygonal is that the polygonal shape becomes a resistance when the foreign matter removal object comes into contact with the wire, rather than the shape having a smooth outer shape such as a circle. This is because it becomes difficult to pass through the slit between the wires. In particular, when the corners of the polygon are arranged on the front side (the side where the foreign matter is first contacted), the relatively elongated foreign matter removal target such as seaweed is on the corner. While it is difficult to pass through the slit by being caught by the tip, the foreign matter is guided to pass through the slit along the inclination of the corner, so that the relatively elongated foreign matter removal object and the foreign matter are efficiently separated. be able to. Therefore, in the foreign matter removing device of the present invention, it is preferable to arrange the wire so that the corner portion of the wire having a polygonal cross section is on the front side. When the wire has an acute angle, it is preferable to arrange the wire so that the acute angle portion is on the front side, and when the cross-sectional shape of the wire is an isosceles triangle, the wire is arranged so that the apex of the isosceles triangle is on the front side. Is particularly preferred.

The cross-sectional dimensions of the wire are not particularly limited, but for example, using a wedge wire screen whose cross-sectional shape is an isosceles triangle, uncut Okinawa mozuku (length 20 to 450 mm, thickness 2 to 3 mm) to small shrimp When removing foreign matter (body length 5 to 15 mm, body width 1 to 1.5 mm), an isosceles triangle having a base of 1 to 4 mm and a height of 2 to 12 mm can be adopted.

The material of the wire is not particularly limited, and may be made of metal, resin, or the like as long as it has the strength to withstand contact with the object for removing foreign matter. For example, a metal such as stainless steel or titanium. Can be used.

The length of the wire is not particularly limited as long as the strength that can withstand the contact with the object to be removed of foreign matter can be guaranteed. Those having a length of 170 to 220 mm can be used.

The size of the slit provided in the wire is not particularly limited as long as it does not pass the foreign matter to be removed and allows the foreign matter to be removed to pass through, and varies depending on the size of the foreign matter to be removed and the foreign matter to be removed. For example, when removing foreign matter of small shrimp (body length 5 to 15 mm, body width 1 to 1.5 mm) from uncut Okinawa mozuku (length 20 to 450 mm, thickness 2 to 3 mm), the width of the slit is 2. ~ 3.5 mm is preferable.

In a wire screen, in order to arrange and fix a large number of wires in parallel, beams should be provided at regular intervals in the direction perpendicular to the longitudinal direction of the wires, in addition to the upper and lower ends of each wire. There are many. However, in the wire screen constituting the foreign matter removing device of the present invention, such beams are reduced as much as possible, and the beams (21a, 22a, 31a, 41a of FIGS. , 42a) is preferably provided and fixed. By using such a wire screen, when an object for removing foreign matter comes into contact with the wire, it flows down toward the lower end of the wire due to gravity without being entangled with the beam between the upper end and the lower end, so that the wire screen is clogged. Is less likely to occur.

The foreign matter removing device of the present invention uses two or more wire screens in a stack. That is, when the foreign matter removing object is introduced into the foreign matter removing device of the present invention, the foreign matter removing object first comes into contact with the first wire screen located on the frontmost side, and if it passes through the first wire screen, it is behind the first wire screen. The wire screens were multiplexed so as to come into contact with the second wire screen located at. However, each wire screen does not have to be fixed inseparably, and each wire screen may be stacked in two or more stages so as to be separable. In short, a structure in which two or more stages of wire screens function substantially as one is included in the foreign matter removing device of the present invention.

The distance between adjacent wire screens before and after forming the foreign matter removing device of the present invention is not particularly limited, but for example, uncut Okinawa mozuku (length 20 to 450 mm, thickness 2 to 3 mm) to small shrimp (body length). When removing a foreign substance (5 to 15 mm, body width 1 to 1.5 mm), the interval is preferably 3 to 10 mm, more preferably 5 to 7 mm.

When stacking the wire screens constituting the foreign matter removing device of the present invention, it is preferable that the wires of the adjacent wire screens in the front and rear intersect at a predetermined angle in the longitudinal direction of the wires. In this way, the wires of the adjacent wire screens in the front and rear intersect at a predetermined angle in the longitudinal direction of the wire, so that the gap between the wires becomes a mesh when viewed from the front. Therefore, when a foreign matter removal object is introduced, the probability that a wire exists in the flow path of this object is almost the same as that of one mesh screen, but the amount of the object actually captured by each screen. Is less than one mesh screen. As a result, clogging of the screen is less likely to occur. The crossing angle is preferably 10 to 25 °, more preferably 13 to 17 °. When it is smaller than 10 °, the foreign matter removal object easily passes through the slit. On the other hand, if it is larger than 25 °, it becomes difficult for foreign matter to pass through the slit. As a result, the foreign matter removal target and the foreign matter cannot be separated well.

The object for which the foreign matter is removed by using the foreign matter removing device of the present invention is not limited, but can be used for removing foreign matter of seaweed, for example. The seaweed may be mozuku, hijiki, wakame seaweed, etc., but the elongated seaweed is easily caught by the wire of the foreign matter removing device of the present invention and does not easily pass through the slit together with the foreign matter. The object to be removed is preferably elongated seaweeds. The elongated seaweed referred to here includes not only the originally elongated seaweed but also the elongated seaweed cut into an elongated shape, but the originally elongated seaweed is preferable, and specifically, mozuku seaweed. Kind is preferable. Specific types of mozuku include Okinawa mozuku (Cladosiphon okamuranus), Futomozuku (Tinocladia cressa), Ishimozuku (Sphaerotricia divariata), and mozuku (Nemacystis).

Examples of foreign substances mixed in seaweed include small shrimp, small fish, shells, pebbles and the like, and the foreign substance removing device of the present invention can be used to remove these foreign substances from seaweeds.

The foreign matter removing device of the present invention is used by installing it on a flow path of a foreign matter and a foreign matter removing object dispersed in a fluid such as water (preferably seawater or a salt solution having a salt concentration equivalent to that of seawater). The fluid and the foreign matter can pass through the slit to catch only the foreign matter removing object and separate the foreign matter removing object from the foreign matter. Therefore, it is preferable that the foreign matter removing device of the present invention is integrated with a device provided with a mechanism for flowing a foreign matter removing object and used as one member constituting the foreign matter removing device. A foreign matter removing device including such a foreign matter removing device of the present invention is also one aspect of the present invention.

Examples of the present invention will be described below, but it goes without saying that various modifications and modifications can be made without departing from the technical scope of the present invention.

FIG. 1 is a schematic configuration diagram of an example of a foreign matter removing device provided with the foreign matter removing device of the present invention. In FIG. 1, the seawater 2 stored in the lower water tank 1 is pumped up by the pump 3 and supplied to the upper water tank 4 via the flow path indicated by the arrow. In the middle of the flow path from the lower water tank 1 to the upper water tank 4, a hopper 5 for putting a foreign matter removal target and / or a foreign matter into seawater is installed. In the upper water tank 4, the foreign matter removal target and / or the foreign matter is dispersed in seawater. Then, the foreign matter removing object and / or the seawater containing the foreign matter is discharged from the slope 6 provided in the upper part of the upper water tank 4 and reaches the foreign matter removing device 7 of the present invention. The foreign matter removing object and / or the seawater containing the foreign matter that has reached the foreign matter removing device 7 is separated into the seawater and the foreign matter and the foreign matter removing object. Then, the seawater and the foreign matter are discharged in the direction indicated by the dotted line, the foreign matter is collected in the first collection basket 8 having a mesh of an appropriate size, and the seawater is returned to the lower water tank 1. The foreign matter removing object separated by the foreign matter removing device 7 is discharged in the direction indicated by the arrow along the wire screen constituting the foreign matter removing device 7, and is collected in the second collection basket 9 having a mesh of an appropriate size.

In FIG. 1, the inclination angle of the slope 6 with respect to the horizontal plane is not particularly limited, and any foreign matter-removing object and / or seawater containing foreign matter may be smoothly discharged. In order to prevent clogging in the hopper 5 and to smoothly charge the foreign matter, it is preferable to mix the foreign matter removal target with a large amount (about 5 times the volume) of seawater in advance and then supply the foreign matter to the hopper 5. Since the foreign matter removal efficiency tends to be better if the foreign matter removal object is well dispersed in the seawater before coming into contact with the foreign matter removing device, premixing with the foreign matter removing object before supplying to the hopper 5 Adjust so that the foreign matter removal target is sufficiently dispersed inside the upper water tank 4 by increasing the amount of seawater or slowing down the speed at which the foreign matter removal target is charged from the hopper 5 relatively. Is preferable. The foreign matter removing device 7 is installed so as to face the slope 6, but the installation angle of the foreign matter removing device 7 with respect to the horizontal plane is α ° (45 °) to β ° as shown in FIGS. 2 (a) and 2 (b). It is preferably (70 °). Further, as shown in FIG. 2C, even when the foreign matter removing device 7 is installed parallel to the slope 6, seawater and foreign matter are discharged in the direction indicated by the dotted line and have an appropriate size. Foreign matter is collected in the first collection basket 8 having a mesh, and the foreign matter removal target separated by the foreign matter removing device 7 is discharged in the direction indicated by the wire screen constituting the foreign matter removing device 7, and is appropriate. It is collected in a second collection basket 9 having a mesh of a size. In this way, it is possible to separate the foreign matter removal target and the foreign matter.

Next, an example in which the foreign matter is actually removed by using the foreign matter removing device shown in FIG. 1 will be described.
[Foreign matter removing device of Example 1]
As shown in FIG. 3A, the cross-sectional shape of the wire is wedge-shaped (an isosceles triangle with a base of 2 mm and a height of 4 mm), and the apex 11a is the front surface (the surface that first contacts the foreign object to be removed). As shown in FIG. 4A, the distance L1 between the vertices of the adjacent wires 12a and 12b is 5 mm, the distance between the bases (slit width) L2 is 3 mm, and the wedge having such a shape is used. As shown in FIG. 5A, a wedge wire screen made of wires is used in two stages, the beam 21a of the wedge wire screen 21 in the first stage (front surface) is horizontal, and the wedge wire screen in the second stage (rear surface) is horizontal. The beam 22a of 22 was rotated by 15 ° in the counterclockwise direction and arranged.

[Foreign matter removing device of Example 2]
Using two stages of wedge wire screens made of wedge wires having the same wedge shape as in Example 1, the beam 21a of the first stage (front) wedge wire screen 21 is horizontal as shown in FIG. 5 (a). The same procedure as in Example 1 was carried out except that the beam 22a of the wedge wire screen 22 of the second stage (rear part) was rotated counterclockwise by 22.5 ° and arranged.

[Foreign matter removing device of Example 3]
As shown in FIG. 3A, the cross-sectional shape of the wire is wedge-shaped (an isosceles triangle with a base of 3 mm and a height of 12 mm), with the apex 11a as the front surface and the base 11b as the rear surface, and FIG. 4 (a). ), The distance L1 between the vertices of the adjacent wires 12a and 12b is 5 mm, the distance between the bases (slit width) L2 is 2 mm, and a wedge wire screen made of wedge wires having such a shape is used in two stages. As shown in FIG. 5A, the beam 21a of the wedge wire screen 21 of the first stage (front surface) is horizontal, and the beam 22a of the wedge wire screen 22 of the second stage (rear surface) is rotated by 15 ° counterclockwise. I let you place it.

[Foreign matter removing device of Example 4]
Using three stages of wedge wire screens made of wedge wires having the same wedge shape as in Example 1, the beam 21a of the first stage (front surface) wedge wire screen 21 is horizontal, and the second stage (middle portion) wedge wire screen. The beam 22a of the 22 was rotated by 15 ° in the counterclockwise direction and arranged, and the same as in the first embodiment except that the beam 21a of the wedge wire screen 21 of the third stage (rear surface) was made horizontal.

[Foreign matter removing device of Comparative Example 1]
Same as Example 1 except that the beam 31a of the wedge wire screen 31 is made horizontal as shown in FIG. 5B by using one stage of a wedge wire screen made of wedge wires having the same wedge shape as in Example 1. did.

[Foreign matter removing device of Comparative Example 2]
As shown in FIG. 5B, the wedge wire screen 31 of the first stage (front surface) and the second stage (rear surface) is used with two stages of wedge wire screens made of wedge wires having the same wedge shape as in the first embodiment. The beams 31a are all horizontal, but the first step is by shifting the beam of the second stage (rear surface) wedge wire screen by about 2 mm in the horizontal direction with respect to the beam of the first stage (front surface) wedge wire screen. The same procedure as in Example 1 was carried out except that the wedge wire screen wire of the second stage (rear surface) was arranged behind the slit (gap between wires) of the wedge wire screen (front surface).

[Foreign matter removing device of Comparative Example 3]
Using two stages of wedge wire screens made of wedge wires having the same wedge shape as in Example 1, the beam 21a of the first stage (front) wedge wire screen 21 is horizontal as shown in FIG. 5 (a). The same as in Example 1 except that the beam 22a of the wedge wire screen 22 of the second stage (rear part) was rotated by 7.5 ° in the counterclockwise direction and arranged.

[Foreign matter removing device of Comparative Example 4]
Using two stages of wedge wire screens made of wedge wires having the same wedge shape as in the first embodiment, as shown in FIG. 5 (c), the beam 41a of the first stage (front surface) wedge wire screen 41 is counterclockwise. The same procedure as in Example 1 was made except that the beam 42a of the wedge wire screen 42 of the second stage (rear part) was rotated by 15 ° and arranged by rotating it by 15 ° in the clockwise direction. (The total crossing angle is 30 °)

[Foreign matter removing device of Comparative Example 5]
As shown in FIG. 3A, the cross-sectional shape of the wire is wedge-shaped (an isosceles triangle with a base of 2 mm and a height of 4 mm), with the base 11b as the front surface and the apex 11a as the rear surface, and FIG. 4 (b). ), The distance L3 between the bases of the adjacent wires 13a and 13b is 3 mm, the distance L4 between the vertices is 5 mm, and two wedge wire screens made of wedge wires having such a shape are used in FIG. 5 (a). ), The beam 21a of the wedge wire screen 21 of the first stage (front surface) is horizontal, and the beam 22a of the wedge wire screen 22 of the second stage (rear surface) is rotated counterclockwise by 15 ° and arranged. ..

[Foreign matter removing device of Comparative Example 6]
As shown in FIG. 3B, the cross-sectional shape of the wire is circular (diameter 2 mm), the distance between adjacent wires (slit width) is 3 mm, and a wire screen made of wires having such a shape is used in one stage. As shown in FIG. 5B, the beam 31a of the wire screen 31 was made horizontal.

[Foreign matter removing device of Comparative Example 7]
Using two stages of wire screens made of wires having the same shape as in Comparative Example 6, the beam 31a of the first stage (front surface) and the second stage (rear surface) of the wire screen 31 can be used as shown in FIG. 5 (b). However, by shifting the beam of the wire screen of the second stage (rear surface) by about 2 mm in the horizontal direction with respect to the beam of the wire screen of the first stage (front surface), the wire screen of the first stage (front surface) The same as in Comparative Example 6 except that the wire of the wire screen of the second stage (rear surface) was arranged behind the slit (gap between wires) of.

[Foreign matter removing device of Comparative Example 8]
As shown in FIG. 5A, the beam 21a of the wire screen 21 of the first stage (front surface) is made horizontal by using two stages of wire screens made of wires having the same shape as that of Comparative Example 6, and the second stage (rear surface). ), The beam 22a of the wire screen 22 was rotated by 15 ° in the counterclockwise direction and arranged in the same manner as in Comparative Example 6.

A test for removing a specific foreign substance was performed using a foreign substance removing device as described above.
(1) Passage rate of mozuku 1 kg of Okinawa mozuku containing no foreign matter was mixed with 5 kg of seawater in advance to obtain seawater containing Okinawa mozuku. 100 kg of seawater was put into the lower water tank 1 of the foreign matter removing device shown in FIG. 1, and the seawater containing the Okinawa mozuku was circulated in the device with the discharge amount of the pump 3 being 6.3 t / hr. As a result of throwing it into the hopper 5 and circulating it in the device for about 3 minutes until all the Okinawa mozuku is discharged from the slope 6 via the upper water tank 4, it passes through the slit of the wire screen of the foreign matter removing device 7. Then, the weight (kg) of the Okinawa mozuku collected in the first collection basket 8 was measured. Such a test was repeated three times, and the arithmetic mean value was taken as the passing rate of mozuku (recovered Okinawa mozuku weight / initial Okinawa mozuku weight 1 kg). The results are shown in Table 1 below. In Table 1, the symbol "◎" indicates that the average value is less than 3.5%, which is extremely good, and the symbol "○" indicates that the average value is 3.5% or more and less than 4.5%, which is excellent. The symbol "Δ" indicates that the average value is 4.5% or more and less than 6.0%, which is slightly bad, and the symbol "x" indicates that the average value is 6.0% or more, which is extremely bad.

(2) Foreign matter passage rate 10 foreign substances (small shrimp; body length 5 to 15 mm, body width 1 to 1.5 mm) as shown in FIG. 6 were mixed with 5 kg of seawater in advance to obtain seawater containing foreign substances. 100 kg of seawater is put into the lower water tank 1 of the foreign matter removing device shown in FIG. 1, and the seawater containing the foreign matter is circulated in the device while the discharge amount of the pump 3 is 6.3 t / hr. As a result of throwing it into the foreign matter 5 and circulating it in the apparatus for about 3 minutes until all the foreign matter is discharged from the slope 6 via the upper water tank 4, it passes through the slit of the wire screen of the foreign matter removing device 7. The number of small shrimp collected in the first collection basket 8 was calculated. Such a test was repeated three times, and the arithmetic mean value was taken as the foreign matter passage rate (number of small shrimp recovered / initial number of small shrimp 10). The results are shown in Table 1 below. In Table 1, the symbol "◎" indicates that the average value is 80% or more, which is extremely good, the symbol "○" indicates that the average value is 75% or more and less than 80%, and the symbol "△". Indicates that the average value is 70% or more and less than 75%, which is a little bad, and the symbol "x" indicates that the average value is less than 70%, which is extremely bad.

(3) Mixing foreign matter removal rate 10 foreign matter (small shrimp; body length 5 to 15 mm, body width 1 to 1.5 mm) as shown in FIG. 6 is mixed with 1 kg of Okinawa mozuku containing no foreign matter, and 5 kg. It was mixed with seawater to obtain seawater containing Okinawa mozuku and foreign substances. 100 kg of seawater is put into the lower water tank 1 of the foreign matter removing device shown in FIG. 1, and the seawater containing the Okinawa mozuku and foreign matter is mixed while circulating the seawater in the device with the discharge amount of the pump 3 being 6.3 t / hr. As a result of throwing it into the hopper 5 of the device and circulating it in the device for about 3 minutes until all the Okinawa mozuku and foreign matter are discharged from the slope 6 via the upper water tank 4, the wire screen of the foreign matter removing device 7. The number of small shrimp collected in the first collection basket 8 after passing through the slit of No. 8 was calculated. Such a test was repeated three times, and the arithmetic mean value was taken as the mixed foreign matter removal rate (number of small shrimp recovered / initial number of small shrimp 10). The results are shown in Table 1 below.

In the above experiment, when two or more wire screens are used, the distance between the front and rear wire screens is 5 mm, and as shown in FIG. 2, the installation angle (α °) of the wire screen (foreign matter removing device 7) with respect to the horizontal plane is set. , 70 °.

As shown in Table 1, according to the foreign matter removing devices of Examples 1 to 4, the passing rate of mozuku and the passing rate of foreign matter are extremely good, and small shrimp entwined with mozuku can be skillfully removed.
However, since the foreign matter removing device of Comparative Example 1 has one screen, it cannot prevent the passage of mozuku seaweed.
Since the foreign matter removing device of Comparative Example 2 has a two-stage screen, the amount of passage of mozuku is smaller than that of Comparative Example 1, but since the crossing angle of the front and rear screens is zero, the amount of passage of small shrimp is also small. Become.
Since the foreign matter removing device of Comparative Example 3 has a two-stage screen, the amount of passage of mozuku is smaller than that of Comparative Example 1, but since the crossing angle of the front and rear screens is small, the amount of passage of mozuku is still large.
Since the foreign matter removing device of Comparative Example 4 has a large crossing angle between the front and rear screens, the amount of small shrimp passing through is small.
In the foreign matter removing device of Comparative Example 5, the crossing angle of the front and rear screens is a preferable value, but the flat bottom of the wedge wire becomes an obstacle, so that the amount of small shrimp passing through is small.
Since the foreign matter removing device of Comparative Example 6 has one screen and the wire has a circular cross-sectional shape, it is easy for mozuku to pass through.
In the foreign matter removing device of Comparative Example 7, since the cross-sectional angle of the front and rear screens is zero and the cross-sectional shape of the wire is circular, it is easy for mozuku to pass through, but the amount of small shrimp passing through is also small.
In the foreign matter removing device of Comparative Example 8, the cross-sectional angle of the front and rear screens is a preferable value, but since the cross-sectional shape of the wire is circular, the amount of small shrimp passing through is small.

The present invention is an extremely useful invention that can be widely used in an industry that handles articles containing foreign substances because the screen is less likely to be clogged and foreign substances can be efficiently removed.

1 Lower water tank 2 Seawater 3 Pump 4 Upper water tank 5 Hopper 6 Slope 7 Foreign matter removal device 8 1st collection basket 9 2nd collection basket 11a Top 11b Bottom 12a, 12b, 13a, 13b Wire 21, 22, 31, 41, 42 Wire Screens 21a, 22a, 31a, 41a, 42a Beams

Claims (6)

A wire screen in which a large number of wires having a polygonal cross-sectional shape are arranged at predetermined intervals is stacked in two or more stages in the front-rear direction. A foreign matter removal device characterized by arranging the part on the front side. The foreign matter removing device according to claim 1, wherein the wires of adjacent wire screens in the front and rear intersect at a predetermined angle in the longitudinal direction of the wire. The foreign matter removing device according to claim 1 or 2, wherein the wedge wire screen has an isosceles right triangle in the cross-sectional shape of the wire, and the vertices of the isosceles triangle are arranged on the front side. The foreign matter removing device according to claim 2 , wherein the crossing angle is 10 to 25 °. The foreign matter removing device according to any one of claims 1 to 4, wherein the seaweed is a mozuku seaweed. The lower water tank storing the fluid, the upper water tank storing the fluid containing the foreign matter and the foreign matter removing object, the fluid feeding means, the foreign matter removing device according to any one of claims 1 to 5 , and the first item. It has one recovery basket and a second recovery basket, and feeds fluid from the lower water tank to the upper water tank by a feeding means, and removes foreign matter discharged from the upper water tank and fluid containing foreign matter removal objects. A foreign matter removing device characterized in that foreign matter is collected in a first collection cage, an object for removing foreign matter is collected in a second collection cage, and the fluid is returned to the lower water tank.

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