JPH07284730A - Screen for screening device and manufacture of screen - Google Patents

Abstract

PURPOSE:To manufacture a screen for a screening device which can prevent the dropping of thin plate-shaped bodies caused by carelessness and control the generation of clogging by protruding a plurality of projections by the given pitch and forming respective projections while folding the projections in the zigzag configuration. CONSTITUTION:First to fourth finger plates 71 on a lower stage screen section are provided with a plurality of fingers 71a protruding in the zigzag fork configuration, and the gravity positions of respective fingers 71a are on the positions shifting left and right to a supporting line 73. When the straight movement vibration is applied to the finger plates 7 by shifting the positions, what is called the twist movement is generated to vary the intervals sensitively between the respective adjoining fingers 71a or apply the different vibration in the up and down direction to respective fingers 71a. First of all, bodies are protected from being caught by respective fingers 71a and also adhering thereto by the arrangement, and provided bodies happen to be caught or to adhere thereto, the bodies can be released and dropped effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used, for example, in a landfill disposal site for industrial waste or the like, to separate the sand and the industrial waste by sieving the sand containing the industrial waste. With regard to the sieve of the sieving device, in particular, by improving the configuration of the sieve, it is possible to prevent the inadvertent dropping of a thin plate-like object, and to suppress the occurrence of clogging phenomenon, requiring complicated maintenance work. The present invention relates to a device devised so as to exert a stable function over a long period of time, and also relates to a manufacturing method capable of easily manufacturing such a sieve.

[0002]

2. Description of the Related Art For example, various industrial wastes are transported to a predetermined landfill site and speculated there, but despite the fact that the amount of the industrial waste has increased dramatically these days. There was a limit to the processing capacity (volume) of landfill sites. Therefore, once, the industrial waste speculated at the landfill disposal site is dug up together with the earth and sand, and it is separated into the industrial waste and the earth and sand, and the combustible material and the incombustible material are taken out from the separated industrial waste, Each is processed separately. The separated soil is used as a soiling agent, combustible material is incinerated, and incombustible material is crushed to a predetermined particle size, and then used as a soiling agent like sand. Therefore, the capacity (volume) of the landfill disposal site will be effectively utilized.

By the way, a sieve device is used to separate industrial waste and earth and sand dug up at a landfill disposal site. Examples of this type of sieving device include, for example, a ripple flow type sieving device, and among them, for example, there are a grizzly deck type ripple flow sieving device, a rod deck type ripple flow sieving device, and the like. The grizzly deck type ripple flow sieving device is one in which grizzly leavers are attached in stages on the sieving surface. Further, in the rod deck type ripple flow sieving apparatus, rods made of manganese steel, spring steel or the like are arranged in parallel on the sieve surface.

[0004]

The above-mentioned conventional structure has the following problems. First, there is a problem that a thin plate-shaped object inadvertently passes through the screen surface.
In addition, there is a problem that an object is caught or attached to a plurality of rods that constitute the sieving device, and a so-called "clogging phenomenon" occurs. That is,
Various kinds of objects are mixed in the industrial waste, and for example, a net or a wire may be caught on the rod. Further, when a large amount of incineration debris such as incinerated ash is mixed and the water content of the incinerated ash is high, it may become sludge-like and adhere to the rod.
This is shown in FIGS. 25 and 26. The sludge-like object 103 is attached to a plurality of rods 101 constituting the sieving device, causing a clogging phenomenon. Incidentally, FIG.
The rod 101 shown in 5 has a circular cross-sectional shape,
On the other hand, the rod 101 shown in FIG. 26 has a quadrangular cross section.

When the above-mentioned clogging phenomenon occurs, the ability of the sieving apparatus is lowered, and when the sieving apparatus which has caused the clogging phenomenon is regenerated, a lot of it is caused. In addition to requiring labor and time, there is a problem that the operating rate of the sieving device is reduced.

The present invention has been made on the basis of the above points, and an object thereof is to prevent an inadvertent drop of a thin plate-like object and to suppress the occurrence of a clogging phenomenon. The present invention provides a screen of a possible screen device and a manufacturing method for manufacturing such a screen.

[0007]

In order to achieve the above object, in the sieve of the sieving apparatus according to the present invention, a plurality of projections are projected at a predetermined pitch, and the projections are projected while being bent in a zigzag shape. It is characterized by that. At that time, it is conceivable that the protrusions are provided with the center of gravity of the protrusions shifted in the left-right direction. Further, when the barycentric position of each protrusion is shifted in the left-right direction, the protrusion may have a quadrangular cross-sectional shape.

Further, the sieve of the sieving apparatus according to the present invention is characterized in that a plurality of projections are provided at a predetermined pitch and the projection length of each projection is changed. that time,
It is conceivable that the protrusion length of each protrusion is set to alternate between long and short. In addition, it is conceivable that the protrusion is provided while being bent in a zigzag shape. Furthermore, it is conceivable that the protrusions are provided so that the center of gravity of each protrusion is shifted in the left-right direction.

Further, the sieve manufacturing method according to the present invention is such that the plate of the sieving device is simultaneously formed on the left and right sides by cutting the plate body along a predetermined path and separating it to the left and right.

[0010]

First, when a plurality of protrusions are projected at a predetermined pitch and the protrusions are bent and bent in a zigzag shape, the vibration width of each protrusion on the support side and the tip side is increased. Therefore, the object can be prevented from being caught or adhered, and even if the object is caught or adhered, it can be effectively separated and peeled off. It is possible to prevent clogging. Also, if the protrusions are installed with the center of gravity of the protrusions shifted in the left-right direction, each protrusion will cause "twist movement (vibration in the left-right direction)".
Thereby, the above-mentioned action and effect can be further promoted. Further, when the projection has a quadrangular cross-sectional shape, the action and effect of the above-mentioned "twist motion (vibration in the left-right direction)" can be further enhanced.

Further, when a plurality of protrusions are provided at a predetermined pitch and the protrusion length of each protrusion is changed, a vibration deviation occurs in each protrusion, thereby catching or adhering an object. In addition to preventing, if an object is caught or adheres,
It can be effectively removed and peeled off, and eventually clogging can be prevented. Further, as one aspect of changing the protrusion length of the protrusion, it is conceivable that the protrusion length of each protrusion is set to alternate between long and short, and other various modes are envisioned. Also in this case, it is conceivable that the projection is provided while being bent in a zigzag shape, whereby the above-described action and effect can be further promoted. Further, it may be considered that the protrusions are provided so that the center of gravity of each protrusion is shifted in the left-right direction, whereby the above-mentioned action and effect can be further enhanced.

Further, the sieve manufacturing method according to the present invention is configured such that the plate of the sieving device is simultaneously formed on the left and right sides by cutting the plate body along a predetermined path and cutting the plate body to the left and right. As a result, two sieves can be manufactured at one time, and the labor required for manufacturing the sieve can be reduced, the time can be shortened, and the cost can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3 are views showing a schematic configuration of an industrial waste sorting plant incorporating a sieving apparatus 1 according to this embodiment. First, a base 3 is provided. This base 3
Assembled from various steel materials, multiple legs 5
And a configuration including the stage 7 and the like installed on the plurality of leg portions 5. The sieving device 1 is installed on the stage 7. Below the sieving apparatus 1, hoppers 9 and 1 for discharging an object that has passed through the sieving apparatus 1.
1, 13, 15 are installed in sequence. The housing 1 is provided above the sieving device 1 so as to cover the space above the sieving device 1.
7 is installed. The front part of this housing 17 (Fig. 1
A discharge port 19 is arranged at the right end of the center, and another discharge port 20 is installed further in front of it. Further, on the left side of the housing 17 in the drawing, there is provided an introduction part 18 into which a mixture of industrial waste and earth and sand to be separated is introduced.

The air duct 2 is provided on the left side of the base 3 in the figure.
1 is laid. One end (upper end) of the air duct 21 communicates with the space below the sieve device 1, and the other end (lower end) communicates with an intake fan (not shown). And
By activating the intake fan, air is supplied into the space below the sieving apparatus 1 via the air duct 21. By the supply of the air, a lightweight object in the industrial waste introduced into the sieving device 1 is blown up and is discharged from the discharge port 19 of the housing 17 described above. Further, another intake fan 23 is installed on the right side of the base 3 in the drawing, and an air duct 25 is connected to the intake fan 23. The tip of the air duct 25 has a sieve device 1
Is connected to the space in front of and the air is supplied into the space.

In the space in front of the sieving apparatus 1, the objects subjected to the sieving operation by the sieving apparatus 1 are discharged, and air is blown into the objects to separate them into lightweight and heavy objects. Then, the heavy load is discharged through the hopper 13 without being significantly affected by the air. Further, the lightweight material is moved further forward by the air and discharged through the hopper 15. Further, a lighter one than a lighter one is blown up and discharged through the discharge port 20. Since most of the above lightweight products are combustible products, they will be incinerated, while heavy products will be processed separately. Further, an object that has passed through the sieving apparatus 1 and dropped is discharged downward through the hoppers 9 and 11. The above is the schematic configuration of the industrial waste sorting plant incorporating the sieving apparatus 1 according to the present embodiment.

Next, referring to FIGS. 4 to 14, the sieving apparatus 1
The configuration of will be described in detail. First, there is a screen cage 27, and an upper screen portion 29 and a lower screen portion 31 are arranged in the screen cage 27. A shaft 33 extends through the screen cage 27 at an intermediate position in the longitudinal direction so as to cross the screen cage 27. The flywheel 35 is provided at both ends of the shaft 33 (both ends outside the screen cage 27). , 37 are fixed respectively. Weights 39 are attached to the flywheels 35 and 37 in an eccentric state (FIG. 7).
Shown in). A pulley 41 is coaxially fixed to one flywheel 35 side. Also, as shown in FIG.
A drive motor 43 is installed on the stage 7, and a pulley 45 is fixed to the output shaft of the drive motor 43. A belt 47 is attached to the pulley 45 and the pulley 41.
Is wound.

The four corners of the screen cage 27 are supported by elastic supporting means 49. When the drive motor 43 is rotated in such a state, the shaft 3 passes through the pulley 45, the belt 47, and the pulley 41.
3 rotates. At that time, the screen cage 27 vibrates in a straight line by the action of the weights 39, 39 arranged eccentrically on both sides of the screen cage 27 and the action of the elastic support structure by the four elastic support means 49. Become. Due to this straight-ahead vibration, the sorting target introduced into the sieving device 1 is sequentially sieved and gradually conveyed forward.

The upper screen portion 29 has the following structure. That is, the grizzly plates 51 are sequentially arranged in a plurality of stages (7 stages in this embodiment). The grizzly plate 51 has a comb-teeth shape, and has a configuration in which a plurality of comb-teeth protrusions 51a are provided at a predetermined pitch. The pitches are not all the same, and the first grizzly plate 51 and the third grizzly plate 51 from the left in FIG. 4 have the same pitch. Also, the second grizzly plate 5
The pitch of 1 is smaller than that. Further, the pitches of the fourth and sixth grizzly plates 51 from the left in the figure are the same, and the pitches of the fifth and seventh grizzly plates 51 from the left are the same. Further, the pitches of the fourth grizzly plate 51 and the sixth grizzly plate 51 from the left in the figure are set to the maximum, and the pitch of the fifth grizzly plate 51 and the seventh grizzly plate 51 from the left is smaller than that. It has become a thing.

Further, the above seven grizzly plates 51
As shown in FIG. 5, the tip is attached with the tip thereof slightly facing upward, and the tip is attached so as to overlap with the rear end of the front (right side of the figure) grizzly plate 51. ing. Also, each grizzly plate 5
The mounting structure for the No. 1 screen cage 27 is as follows. First, the grizzly plate 51 is shown in FIG.
As shown in FIG. 3, the bolts and nut fastening means 59 are attached and fixed on the support frame 57 made of steel materials (angle materials) 53 and 55. Grizzly frames 61, 61 (only one of which is shown in FIG. 8) are attached to both ends of the support frame 57. A bolt hole 63 and an arc-shaped long bolt hole 65 are vertically formed in the grizzly frame 61. Then, as shown in FIG. 6, the pair of grizzly frames 61, 61 are arranged inside the grizzly cage 27, and the bolts 6 are inserted into the bolt holes 63 and the long bolt holes 65.
The nut 69 is screwed through the 7 to fasten / fix the nut 69. When adjusting the mounting angle of the grizzly plate 51, loosen the fastening by the bolt 67 and the nut 69, adjust within the range of the long bolt hole 65, and fasten again by the bolt 67 and the nut 69. Good.

Next, the structure of the lower screen portion 31 will be described. As shown in FIGS. 5 and 7, the lower-stage sieve unit 31 has a plurality of stages (7 in the case of this embodiment) of finger plates 71.
It has a structure in which the layers are sequentially arranged. Of these, the first to fourth finger plates 71 from the left in FIG. 5 are configured as shown in FIG.
The fifth to seventh finger plates 71 are configured as shown in FIG. As shown in FIGS. 10 and 11, the finger plate 71 according to the present embodiment has a zigzag fork shape and includes a plurality of fingers 71a protruding in a zigzag fork shape.

The structure of the finger plate 71 is shown in FIG.
This will be described in more detail with reference to FIGS. First,
The first to fourth finger plates 71 from the left in FIG. 5 are provided with a plurality of fingers 71a protruding in a zigzag fork shape as shown in FIGS. The space between 71a is not straight like the conventional one, but has a zigzag shape. Thereby, it is possible to prevent the thin plate-shaped object from being accidentally dropped.

Considering the position of the center of gravity of each finger 71a, the finger 71a is at a position displaced to the left and right with respect to the support line 73 of the finger 71a. This is because the number of the convex portions 75 of the finger 71a is three above the support line 73 and two below the support line 73, that is, the center of gravity exists above the support line 73. In this way, by shifting the center of gravity of the fingers 71a, so-called "twist movement (vibration in the left-right direction)" occurs when the straight-forward vibration described above is applied to the finger plate 71.
When such a "twist movement (vibration in the left-right direction)" occurs, the interval between the adjacent fingers 71a changes subtly, or each finger 7a is changed.
1a vibrates differently in the vertical direction. Thereby, first, the object is caught in the finger 71a,
In addition to preventing adhesion, even if an object gets caught or adheres,
They will effectively separate and fall. This is intended to prevent clogging.

On the other hand, the fifth to seventh finger plates 71 from the left in FIG. 5 are, as shown in FIG. 14, a plurality of fingers 71a protruding in a zigzag fork shape.
Thus, the space between the fingers 71a is not a straight line as in the conventional case but a zigzag shape. Thereby, it is possible to prevent the thin plate-shaped object from being accidentally dropped. Further, in this case, since the position of the center of gravity of each finger 71a is on the support line 73, the above-described "twist movement (vibration in the left-right direction)" does not occur. It should be noted that the fifth to seventh finger plates 71 from the left in FIG. 5 do not decenter the center of gravity of the fingers 71a because the finger plates 71 from the left to the fourth in FIG.
5, the arrangement pitch of the fingers 71a is large, and the concern about the occurrence of the clogging phenomenon is lower than that of the finger plates 71 from the first to the fourth from the left in FIG.

Next, a method of manufacturing the finger plate 71 having the above structure will be described. First, one plate is prepared, and it is cut into a predetermined shape by, for example, a laser processing machine. At this time, the width of the fingers 71a and the size of the mutual gap of the fingers 71a are set to be equal.
As a result, as shown in FIGS. 12 and 14, the finger plates 71, 71 (the one of which is shown by an imaginary line) having the same shape on the left and right are simultaneously manufactured. According to such a manufacturing method, it is possible to efficiently manufacture a large number of finger plates 71 using the material without waste. It is not always a requirement that the width of the fingers 71a and the size of the mutual gap of the fingers 71a be set equal to each other, and even if they are different, a pair of finger plates 71 of different types can be manufactured at the same time.

The attachment structure of the finger plate 71 having the above structure is as follows. That is, as shown in FIG. 9, first, the support frame 77 is made up of the steel materials (angle materials) 74 and 76, and the finger plate 7
1 is attached / fixed to the upper surface of the support frame 77 by bolt / nut fastening means 78. Finger frames 80, 80 are attached to both ends of the support frame 78. The finger frame 80 has bolt holes 8
2. An arc-shaped long bolt hole 84 is bored. Then, the finger frames 80, 80 are arranged inside the screen cage 27, and the nuts 88 are screwed into the bolt holes 82 and the arc-shaped long bolt holes 84 by inserting the bolts 86, so that the finger plate 71 is attached. I have to. When adjusting the mounting angle of the finger plate 71, the fastening by the bolts 86 and nuts 88 is loosened, the bolts are rotated within the range of the long bolt holes 84, and the bolts 86 and nuts 88 are again rotated at desired positions.
It may be concluded by

By the way, the upper-stage sieve portion 29 having the above structure
And the relationship between the lower sieving portion 31 are as follows. First, the upper-stage sieving unit 29 separates relatively large objects from the objects to be sorted, and protects them from falling directly onto the lower-stage sieving unit 31. In addition, when the amount of the separation target on the upper sieve unit 29 is too large, the upper sieve unit 29
It is conceivable to increase the opening area of the
The amount of the separation target on the lower sieve unit 31 increases. That is, the upper-stage sieving unit 29 has a function of adjusting the amount of the sorting object falling on the lower-stage sieving unit 31. Incidentally, the amount of the separation target on the lower-stage sieve unit 31 is appropriately about 75 to 100 mm in height, and therefore, the opening area of the upper-stage sieve unit 29 is usually smaller than that of the lower-stage sieve unit 31.
The opening area is set to about 3 times.

Further, the inclination angle of the upper sieving portion 29 and the lower sieving portion 3
In the case of this embodiment, the inclination angle of the upper sieving portion 29 can be adjusted in the range of 4 ° to 12 °, while the inclination angle of the lower sieving portion 31 is 1. The angle can be adjusted within the range of 3 ° to 13 °. Further, the inclination angle of the lower sieving portion 31 is set to be larger than the inclination angle of the upper sieving portion 29 by about 1 °. That is, the flow velocity of the separation target in the lower sieving unit 31 is set higher accordingly. Further, the flow velocity in the lower sieving portion 31 is, for example, 8 to 1
About 7 m / min is suitable. On the other hand, when the water content of the object to be separated is high, it is slowed down. As a means for slowing down, it is conceivable to reduce the tilt angle, but in addition to this, it is conceivable to reverse the rotation direction of the drive motor 43.

The operation will be described based on the above configuration. Since the operation of the entire sieving apparatus 1 and the operation as the industrial waste separation plant are as already described, here, FIG.
The operation of the first to fourth finger plates 71 from the left in FIG. 5 will be described with reference to FIGS. As described above, the finger plate 71
Has its fingers 71a protruding in a zigzag fork shape, and its center of gravity deviated in the left-right direction with respect to the support line 73. In such a configuration, when the straight traveling vibration is applied, as described above, “twist movement (vibration in the left-right direction)” occurs.
That is, as shown in FIG. 16, the finger 71a vibrates in the vertical direction and also moves so as to be twisted to the side where the center of gravity is inclined. As a result, the facing surfaces of the adjacent fingers 71a, 71a are deviated from each other, so that the adhered matter 80 adhered between the fingers 71a is effectively separated and dropped. That is, it is possible to effectively prevent the object from being caught or the adhered matter 80 from being adhered, and if the object is caught or the adhered matter 8
Even if a situation in which 0 adheres occurs, it will be effectively detached, peeled off and dropped due to the above movement, and eventually the clogging phenomenon can be prevented.

According to this embodiment, the following effects can be obtained. First, since the fingers 71a of the finger plate 71 of the lower sieving device 31 are formed in a zigzag fork shape, it is possible to prevent the thin plate-shaped object from being accidentally dropped. This is each finger 7
This is because the space between the la's 1a is not straight but formed in a zigzag shape, and even if a thin plate-shaped object tries to fall, it collides with the convex portion 75 of the finger 71a and cannot fall.

Further, in FIG. 5, with respect to the first to fourth finger plates 71 on the left handle, the center of gravity of each finger 71a is located at a position displaced left and right with respect to the support line 73 of the finger 71a. Therefore, by imparting the straight-ahead vibration, "twist motion (vibration in the left-right direction)" is generated, whereby it is possible to prevent the object from being caught and the adhered matter 80 to be attached, and Even if an object is caught or the adhered matter 80 adheres, it can be effectively dropped or peeled off, and the clogging phenomenon can be prevented. As described above, if the clogging phenomenon can be prevented, complicated maintenance work becomes unnecessary, and the cost can be reduced and the operation rate can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, the configuration of the sieving apparatus 1 itself is the same as that of the first embodiment, and the construction of the industrial waste sorting plant in which the sieving apparatus 1 is incorporated is different. First, there is a base 81, and this base 81 is assembled from a plurality of steel materials,
It is composed of a plurality of leg portions 83 and a stage 85 and the like installed on the plurality of leg portions 83. The screen device 1 is installed on the stage 85. Further, an introduction hopper 87 for introducing the objects to be separated into the sieve device 1 is installed on the sieve device 1. Further, a belt conveyor means 89 is installed below the sieving apparatus 1, and another belt conveyor means 91 is installed in front of the sieve apparatus 1. Then, the object which has passed through the sieving apparatus 1 and dropped is conveyed to the left side in the drawing by the belt conveyor means 89. Further, the object remaining on the sieving apparatus 1 is conveyed by the belt conveyor means 91 and is separately processed at the destination.

Since the structure of the sieving apparatus 1 is the same as that of the first embodiment, its explanation is omitted. In this way, even if the configuration of the industrial waste sorting plant in which the sieving apparatus 1 is incorporated is changed, the same action and effect can be achieved.

Next, a third embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, the configurations of the grizzly plate 51 of the upper sieve portion 29 and the finger plate 71 of the lower sieve portion 31 in the sieve device 1 described in the first embodiment are changed. First, as shown in FIG. 17, the grizzly plate 51 is one in which a plurality of comb-teeth-shaped protrusions 51a are provided at a predetermined pitch.
At that time, the protruding length is alternately lengthened or shortened. That is, in FIG. 19, assuming that the length of the comb-teeth protrusion 51a located at the uppermost position is L, the length of the second comb-teeth protrusion 51a from the uppermost position is L ₁ shorter than the above L by a predetermined amount. Has become. Below, they are becoming shorter and longer alternately.

On the other hand, the finger plate 71 of the lower sieving portion 31 is as shown in FIGS. The finger plate 71 is formed by protruding a plurality of fingers 71a at a predetermined pitch, and in this case as well, the protruding length thereof is alternately lengthened or shortened. That is, in FIG. 20, 'When the length of the second finger 71a from the top, said L' the length of the fingers 71a located at the top L has only a short L ₁ 'a predetermined amount than . Below, they are becoming shorter and longer alternately.

As described above, the vibration deviation can be generated by alternately changing the lengths of the comb-teeth-shaped protrusions 51a and the fingers 71a. That is, the adjacent comb tooth-shaped protrusions 5
The vibration modes of the finger 1a and the finger 71a are slightly deviated from each other, which causes a phenomenon of catching an object and an adhered object 8
It is possible to prevent the sticking phenomenon of 0, to effectively separate the caught object, and to effectively peel and drop the adhered material 80. The finger plate 71 in this embodiment adopts the above-mentioned configuration for changing the protruding length and uses the zigzag configuration described above in combination, so that the effect is extremely high.

The above operation will be described with reference to FIGS. As shown in FIG. 23, the long finger 71a and the short finger 71a have different vibration amplitudes. That is, the longer finger 71a has a shorter amplitude.
It becomes larger than the amplitude of a. As a result, the fingers 71a
As a result, a deviation in vibration occurs between the objects, and as described above, the phenomenon of catching an object and the phenomenon of adhering the adhering matter 80 are prevented, and the caught object is effectively separated or the adhering matter 80 adhered is effective. It can be peeled off and dropped. Further, the finger 71a is not only configured to change the protruding length thereof, but also has a zigzag fork shape and its center of gravity is eccentric.
Therefore, as shown in FIG. 24, not only the vibrations having different amplitudes but also the vibrations accompanied by the twist motion are generated. Thereby, the above-mentioned effects can be further enhanced.

The present invention is not limited to the first to third embodiments. First, two different types of industrial waste separation plant have been described as the configuration of the industrial waste separation plant incorporating the sieving apparatus 1, but the present invention is not limited to these, and the industrial waste separation plant in any state may be incorporated.
Although the grizzly plate 51 and the finger plate 71 in the upper screen portion 29 and the lower screen portion 31 are plate-shaped, the present invention is not limited thereto. For example, it is conceivable to use a rod having a circular cross section as the protrusion. However, in this case, it is difficult to apply the above-described manufacturing method (manufacture two sieve portions simultaneously on the left and right sides from the plate body). In addition, when the protrusion is provided while being bent in a zigzag shape, how many times it is bent, the amount of protrusion in the left-right direction when bent, and the like may be set arbitrarily. Also, when the protrusion length of the protrusion is changed, the extent to which the protrusion length is changed may be set arbitrarily.

[0038]

As described in detail above, according to the sieve of the sieving apparatus of the present invention, first, a plurality of protrusions are formed while being bent in a zigzag shape at a predetermined pitch, and thus are projected.
In each protrusion, the vibration width is different between the support portion side and the tip end side, which can prevent an object from being caught or attached, and even if an object is caught or attached. However, it can be effectively removed and peeled off, and eventually clogging can be prevented. Also, when the protrusions are installed with the center of gravity of the protrusions displaced in the left-right direction, each protrusion causes "twist movement (vibration in the left-right direction)", which causes the above-mentioned action and effect. Can be further promoted. Further, in that case, the above effect can be further enhanced by making the cross-sectional shape of the protrusion a quadrangle. Also, when a plurality of protrusions are provided at a predetermined pitch and the protrusion length of each protrusion is changed, vibration deviation will occur in each protrusion, thereby preventing the object from being caught or attached. In addition, even if an object is caught or adhered, it can be effectively removed and peeled off, which also prevents clogging. Also in this case, it is conceivable that the projection is provided while being bent in a zigzag shape, whereby the above-described action and effect can be further promoted. Further, it may be considered that the protrusions are provided so that the center of gravity of each protrusion is shifted in the left-right direction, whereby the above-mentioned action and effect can be further enhanced. In addition, according to the sieve manufacturing method of the present invention, the plate body is cut along a predetermined path, and the left and right sides of the plate body are cut off so that the sieves of the screen device are formed simultaneously on the left and right sides. Further, it is possible to manufacture two sieves at a time, and it is possible to reduce the labor required for producing the sieve, the time, and the cost.

[Brief description of drawings]

FIG. 1 is a front view of a plant in which a sieving apparatus is incorporated according to a first embodiment of the present invention.

FIG. 2 is a side view of a plant in which a sieving apparatus is incorporated according to the first embodiment of the present invention.

FIG. 3 is a top view of a plant in which a sieving apparatus is incorporated according to the first embodiment of the present invention.

FIG. 4 is a view showing the first embodiment of the present invention and is a top view of the sieving apparatus.

FIG. 5 is a front view of a sieving apparatus showing the first embodiment of the present invention.

FIG. 6 is a side cross-sectional view of the sieving apparatus showing the first embodiment of the present invention.

FIG. 7 shows the first embodiment of the present invention and is a front sectional view of a sieving apparatus.

FIG. 8 is a sectional view showing the attachment structure of the grizzly plate in the first embodiment of the present invention.

FIG. 9 is a sectional view showing a finger plate mounting structure in the first embodiment of the present invention.

FIG. 10 is a plan view of a finger plate according to the first embodiment of the present invention.

FIG. 11 is a plan view of a finger plate according to the first embodiment of the present invention.

FIG. 12 is a partial plan view of a finger plate according to the first embodiment of the present invention.

FIG. 13 is a side view of the finger plate according to the first embodiment of the present invention.

FIG. 14 is a view showing a first embodiment of the present invention and is a partial plan view of a finger plate.

FIG. 15 is a partial plan view for explaining the action of the finger plate in the first embodiment of the present invention.

FIG. 16 is a partial front view for explaining the operation of the finger plate according to the first embodiment of the present invention.

FIG. 17 is a front view of a plant in which a sieving apparatus is incorporated according to a second embodiment of the present invention.

FIG. 18 is a top view of a plant in which a sieving apparatus is incorporated according to a second embodiment of the present invention.

FIG. 19 is a partial plan view of the grizzly plate showing the third embodiment of the present invention.

FIG. 20 is a partial plan view of a finger plate according to a third embodiment of the present invention.

FIG. 21 is a side view of the finger plate according to the third embodiment of the present invention.

FIG. 22 is a partial plan view of a finger plate for explaining the operation in the drawing showing the third embodiment of the present invention.

FIG. 23 is a side view of the finger plate for explaining the operation of the third embodiment of the present invention.

FIG. 24 is a partial front view of a finger plate for explaining the operation of the third embodiment of the present invention.

FIG. 25 is a cross-sectional view for explaining an adhesion phenomenon of an adhered substance in a conventional example.

FIG. 26 is a cross-sectional view for explaining an adhesion phenomenon of an adhered substance in a view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screening device 27 Screen cage 29 Upper screen part 31 Lower screen part 51 Grizzly plate 51a Comb-shaped projection (projection) of grizzly plate 71 Finger plate 71a Finger (projection)

Claims (8)

[Claims] 1. A sieve of a sieving apparatus, wherein a plurality of projections are provided at a predetermined pitch, and the projections are provided while being bent in a zigzag shape. 2. The sieve of the sieving apparatus according to claim 1, wherein each of the protrusions is provided so as to shift the center of gravity thereof in the left-right direction. 3. The sieve of the sieving apparatus according to claim 2, wherein the protrusion has a quadrangular cross-sectional shape. 4. A sieve of a sieving apparatus, wherein a plurality of protrusions are provided at a predetermined pitch and the protrusion length of each protrusion is changed. 5. The sieve of the sieving apparatus according to claim 4, wherein the protrusion length of each protrusion is set so as to alternately repeat long and short. 6. The sieve of the sieving apparatus according to claim 4 or 5, wherein the protrusion is provided while being bent in a zigzag shape. 7. The sieve of the sieving apparatus according to claim 6, wherein each of the protrusions is provided so as to shift the center of gravity thereof in the left-right direction. 8. A method of manufacturing a sieve, wherein a plate body is melt-cut along a predetermined path and separated into left and right sides to form a pair of sieves at the same time.