JP7239295B2 - Screen mechanism, vibrating screen device and vibrating screen method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a screen mechanism having a sieve surface with a predetermined mesh size, a vibrating screen apparatus having the screen mechanism, and a vibrating screen method.

Incinerated ash discharged from a garbage incinerator is put into an ash melting furnace and melted for volume reduction and detoxification, and the molten slag that falls into a water tank is discharged as granulated slag. Such granulated slag is reused as concrete aggregate or asphalt aggregate, but since the particle size distribution is specified according to the application, it is necessary to classify it according to the purpose. For example, when reused as asphalt aggregate, it is necessary to make the mass percentage of those passing through a 4.75 mm sieve according to JISA5032 FM2.5 100%.

However, if the object to be classified is hydrophilic like water granulated slag and has cohesiveness or adhesion due to the surface tension of adhering water, or has both properties, the sieve surface It is difficult to classify using a vibrating sieve device that includes a formed screen mechanism and a vibrating mechanism that vibrates the screen mechanism, and classifies objects to be classified while conveying them into the screen mechanism. rice field.

As shown in FIG. 1, when an object P to be classified, such as water granulated slag, to which water is attached is vibrated on the sieve surface 14, the fine slag particles are aggregated through the water to form lumps. Agglomeration occurs where particles grow or adhere to the periphery of coarse-grained slag to form clumps. Particles that grow in clumps run like sliding on the sieve surface without being classified, so they cannot be classified sufficiently. This is because there was a problem

As an example of a vibrating screen device capable of coping with such a problem, Patent Document 1 discloses a screen mechanism having a sieve surface formed thereon and a vibrating mechanism for vibrating the screen mechanism. A vibrating screen device that classifies objects to be classified while conveying them, wherein the sieve surface provided in the screen mechanism is divided into a plurality of classification regions along the conveying direction of the objects to be classified, and the objects to be classified are temporarily retained. A vibrating sieve apparatus has been proposed in which a plurality of weirs that allow the sieving to be carried out are arranged above the sieve surface in a posture that intersects the conveying direction.

According to the vibrating sieve device, even if the wet objects to be classified that are conveyed on the sieve surface due to vibration adhere to each other through water and agglomerate, they are temporarily retained on the upstream side of the weir and retained. By increasing the frequency of contact or collision between the agglomerated object and the rope and/or the agglomerates, the particles are dispersed to the state before agglomeration, and the classification progresses. By providing a plurality of weirs, such retention, dispersion, and classification processes are repeated, and efficient classification is achieved without increasing the length of the sieve surface.

JP 2008-136893 A

However, in the conventional screen mechanism, the diameter of the rope constituting the sieve with the desired mesh size is small, and if a weir having vibration resistance is integrated with such a sieve surface, the inertial force due to the weight of the weir is generated. As a result, the force acting on the fixed part of the thin rope is large and breaks, so there is a problem with durability. There was a danger that the weir would break away. There is also a demand for further miniaturization by further shortening the length of the sieve surface in the conveying direction.

In view of the above-mentioned conventional problems, the object of the present invention is to enable efficient classification without drying or spraying water, even if the object to be classified is wet matter with cohesiveness. It is to provide a screen mechanism, a vibrating screen device, and a vibrating screen method which are compact and durable.

In order to achieve the above object, the screen mechanism according to the present invention is characterized by: a plurality of crossing side ropes arranged in a direction crossing the conveying direction of the classified object; and a plurality of flow-side ropes arranged in such a manner as to form a sieve surface with a predetermined opening between the cross-side ropes, and the cross-side ropes are provided with the top enveloping surface of the flow-side ropes as a reference. The crossing side rope that functions as a weir that temporarily retains the objects to be classified by setting the vertical height to be equal to or greater than the classification average diameter of the objects to be classified, and the vertical height based on the top envelope surface of the flow side rope is set to be less than the classification average diameter of the objects to be classified, there is a crossing rope that does not function as a weir that temporarily retains the objects to be classified, and the crossing rope that functions as the weir does not function as the weir in the conveying direction. A plurality of crossing side ropes, which are arranged above the flow side ropes with the side ropes interposed therebetween and function as the weir, have a height in the vertical direction based on the top envelope surface of the flow side ropes. It is in the points set above.

A sieve with a predetermined mesh size consisting of a plurality of cross-side ropes arranged in a direction intersecting the conveying direction of the object to be classified and a plurality of flow-side ropes arranged so as to intersect the cross-side ropes in a plan view. A face is formed. A plurality of crossing side ropes that function as weirs for temporarily retaining the objects to be classified are provided so as to sandwich the crossing side ropes that do not function as weirs while protruding above the flow side ropes. For example, even if the object to be classified is an aggregate such as granulated slag, the aggregated object to be classified and the crossing side rope functioning as a weir arranged above the flow side rope, and / or the aggregated object to be classified By contacting or colliding with each other, the particles can be dispersed in a state before agglomeration and can be efficiently classified and dropped from the corresponding sieve surface.

In addition, by setting the vertical height of the intersecting ropes functioning as weirs on the sieve surface with the top of the flow-side rope as a reference to be equal to or greater than the classification average diameter of the objects to be classified, the objects to be classified are blocked and classified. It functions well as a weir that encourages

In addition to the above-described first characteristic configuration, the second characteristic configuration is set so that the interval between the crossing side ropes functioning as the weirs becomes narrower toward the downstream side along the conveying direction of the objects to be classified. at the point where

The classification process progresses as the material is conveyed from the upstream side to the downstream side, and the volume of the material to be classified decreases toward the downstream side. Therefore, if the distance between the intersecting ropes functioning as weirs becomes shorter toward the downstream side along the conveying direction of the object to be classified, even if the sieve surface is short in the conveying direction, the entire sieve surface can be covered. It can be effectively used for efficient classification, and the size of the device can be reduced.

In addition to the above-described first or second characteristic configuration, the third characteristic configuration is the vertical height based on the top enveloping surface of the flow-side rope toward the downstream side along the conveying direction of the classification target. is set to be low.

If the height of the crossing side rope functioning as a weir is the same as the height of the crossing side rope functioning as a weir on the upstream side on the downstream side where the classification progresses and the lump size of the object to be classified becomes smaller, the object to be classified There is a risk that the efficiency of conveying to the downstream side of the crossing side rope that functions as a weir will be reduced by jumping, but the vertical height of the crossing side rope that functions as a weir is increased as the classified object is conveyed toward the downstream side along the conveying direction. is set to be low, efficient classification can be performed over the entire conveying surface from the upstream side to the downstream side.

A first characteristic configuration of a vibrating screen device according to the present invention includes a screen mechanism having any one of the first to third characteristic configurations, and a vibrating mechanism for vibrating the screen mechanism. The object to be classified is classified while being conveyed in the conveying direction.

When a screen mechanism in which cross-side ropes are arranged above the flow-side ropes is used, the cross-side ropes projecting above the flow-side ropes face the conveying direction of the objects to be classified and temporarily retain the objects to be classified. It functions as a weir. For example, even if the object to be classified is an agglomerate such as granulated slag, the agglomerated object to be classified and the intersecting rope, and/or the agglomerated objects to be classified contact or collide with each other to disperse to the state before agglomeration. It becomes possible to efficiently classify and drop from the corresponding sieve surface. Since the sieve surface is formed by the ropes on the crossing side and the ropes on the flow side, a stable vibrating state can be realized even if the sieve is vibrated by the vibrating mechanism, and a compact and durable vibrating sieve device can be realized.

A characteristic configuration of the vibrating sieve method according to the present invention is a vibrating sieve method in which a screen mechanism having a sieve surface with a predetermined mesh size is formed to vibrate, and classified while conveying an input classification target, the screen. As a mechanism, a plurality of crossing side ropes arranged in a direction intersecting the conveying direction of the classification target, and a predetermined mesh between the crossing side ropes arranged so as to cross the crossing side ropes in a plan view. A plurality of flow-side ropes forming an open sieve surface are provided, and the vertical height of the crossing-side ropes is set to be equal to or greater than the classification average diameter of the objects to be classified, with reference to the top envelope surface of the flow-side ropes. By setting the height in the vertical direction to be less than the classification average diameter of the objects to be classified based on the top enveloping surface of the intersection side rope that functions as a weir that temporarily retains the objects to be classified and the top envelope surface of the flow side rope. There is a cross-side rope that does not function as a weir for temporarily retaining the objects to be classified, and a plurality of cross-side ropes that function as a weir are arranged above the flow-side rope with the cross-side rope that does not function as a weir sandwiched in the conveying direction. The crossing side ropes functioning as the weirs are sieved using a screen mechanism whose height in the vertical direction is set to be equal to or greater than the classification average diameter of the object to be classified with reference to the top envelope surface of the flow side ropes. Objects to be classified are thrown in from the upstream side, classified while being temporarily retained by the intersecting rope functioning as the weir, and objects to be classified that have jumped over the intersecting rope are temporarily retained by the intersecting rope functioning as the next weir. while repeating the classification process.

As described above, according to the present invention, even if the object to be classified is a cohesive wet matter, it can be efficiently classified without drying or spraying water. It is now possible to provide a screen mechanism, a vibrating sieve device, and a vibrating sieve method.

Explanatory drawing of the process in which wet objects to be classified grow into lumps (a) is an explanatory view of the vibrating screen device according to the present invention viewed from the side, and (b) is an explanatory view of the vibrating screen device viewed from the front. Explanatory drawing of main part of screen mechanism (a) is an explanatory diagram showing multiple aspects of the arrangement relationship between the crossing side rope and the flow side rope, and (b) is an explanatory diagram showing an example of the height and installation width of the weir. (a) to (c) are explanatory diagrams showing multiple aspects of the positional relationship between the ropes on the crossing side and the ropes on the flow side.

The screen mechanism, vibrating sieve device and vibrating sieve method according to the present invention will be described below taking as an example the case where the material to be classified is water granulated slag obtained by melting waste such as incinerated ash. The screen mechanism, vibrating sieve apparatus, and vibrating sieve method according to the present invention classify not only water granulated slag, but also granular chemicals, earth and sand, incinerated ash, and other moist objects to be classified while conveying them without injecting water. It can be applied to any object that needs to be classified.

[Overall configuration of vibrating screen device]
As shown in FIG. 2, the vibrating screen device 10 includes a screen mechanism 13 supported by a machine base 11 via a spring mechanism 12, and a vibrating mechanism that vibrates the screen mechanism 13 in the direction of an arrow indicated by a dashed line in the figure. It is configured with a mechanism 18 .

The screen mechanism 13 has a sieve surface 14 composed of a screen S made of a urethane resin mesh as a sieve having 6 mm classification holes (screen meshes) formed therein, and a sieving surface 14 to which water-granulated slag P is introduced. A first collection unit 16 that collects the sieved products (fine slag) that have passed through the sieve surface 14, and a second collection unit that collects large-diameter sieved products (coarse slag) that have not passed through the sieve surface 14. The sieve surface 14 is covered with a cover body 19 for preventing scattering of dust.

As will be described in detail later, the screen mechanism 13 includes a plurality of intersecting side ropes arranged in a direction intersecting the conveying direction of the granulated slag and a plurality of ropes arranged in a direction along the conveying direction of the granulated slag. A sieve surface 14 is formed with the flow side ropes.

The size of the classification hole (screen mesh) is appropriately set to an appropriate size according to the object to be classified. As shown in the figure, the downstream side in the conveying direction may be inclined upward, or conversely, the downstream side in the conveying direction may be inclined downward. Further, the method of vibrating the sieve is not limited to the balance type, and since the same effect can be obtained with a vibrating sieve of the forced vibration type, the forced vibration type may be used.

Water granulated slag P, which has a water content of 2 to 20% and a distribution of diameters ranging from several millimeters to ten-odd millimeters, is injected from an injection unit 15 and vibrated by a vibrating mechanism 18 composed of a vibration motor, a crank-type motor, or the like. On the sieve surface 14 which vibrates by the excitation force of , the particles are conveyed while being classified toward the second collection section 17 while vibrating along the excitation direction.

The sieve surface 14 is divided into a plurality of classification regions Rn (n = 1, 2, ...) along the conveying direction of the granulated slag P, and a plurality of crossing side ropes arranged along the conveying direction is configured to function as a weir 1 that temporarily retains the granulated slag P on its upstream side. A part of the crossing side rope is called a second crossing side rope. The second crossing side rope is made of urethane resin integrally formed with the screen S, and is perpendicular to the conveying direction above the sieve surface 14 at an interval in which the area of the divided classification region decreases toward the downstream side in the conveying direction. placed in an attitude.

A guide member 2 made of a rubber plate suspended and supported by a support arm provided above is disposed in the center of the transport direction of the upstream classification regions R1 and R2 partitioned by the second crossing ropes. The amount of granulated slag P conveyed downstream on the surface 14 can be adjusted. In order to avoid the inconvenience that when a large amount of granulated slag P is transported to the second crossing side rope at one time, it crosses over the second crossing side rope without being dispersed, the lower end of the guide member 2 is separated from the sieve surface 14. The height to the edge is set to be slightly above or below the height of the second crossing side rope.

The retention area R of the granulated slag P formed on the upstream side of each second crossing rope is set to become smaller toward the downstream side. The classification process progresses as the material is transported from the upstream side to the downstream side, and the volume of the material to be classified decreases toward the downstream side. Even if there is, the sieve surface can be effectively used to efficiently classify, and the size of the device can be reduced.

The water-granulated slag P introduced into the sieve surface 14 grows into a mass by vibrating fine-grained slags through water, or adheres to the periphery of coarse-grained slag and grows into a mass. It reaches the second intersecting rope on the upstream side and is temporarily stopped there. At this time, the retained agglomerate contacts or collides with the net or agglomerates and is gradually dispersed to the state before agglomeration, and the fine slag falls downward from the sieve surface 14 . The granulated slag P that jumps over the second intersection side rope and is transported downstream reaches the next second intersection side rope that is installed downstream, is temporarily retained, and is classified while being dispersed in the same manner as described above. . By repeating such a distributed classification process, efficient classification is performed.

In this embodiment, the height from the sieve surface 14 is about 7 mm, which is slightly lower than half of the vibration width of the vibrating mechanism of the sieve, 16 mm, so that the interval gradually narrows from the upstream side to the downstream side. A plurality of high second crossing ropes are arranged, and water granulated slag having a certain particle size jumps over the second crossing ropes due to vibration and is transported downstream. The interval between the second crossing side ropes is set to 100 to 250 mm on the upstream side and several tens of mm on the downstream side.

The height of the second crossing side rope is preferably set to a height at which the particles of the size of the opening of the sieve jump on impact with the net. Particles larger than the sieve mesh are less likely to be discharged from the sieve surface to the outside of the sieve surface. You can set it.

That is, the second intersecting rope has a function of dispersing the aggregated objects to be classified and the sieve, and/or by increasing the frequency of contact or collision between the aggregated objects to be classified, to the state before aggregation.

[Structure of Screen Mechanism]
FIG. 3 shows a portion of the left side of the screen mechanism 13 viewed from the upstream side to the downstream side in the granulated slag conveying direction. The screen mechanism 13 is composed of a plurality of crossing side ropes 14A arranged in a direction intersecting the conveying direction of the granulated slag and a plurality of flow side ropes 14B arranged in a direction along the conveying direction of the granulated slag. It is configured such that a sieve surface 14 is formed.

Note that the flow-side ropes 14B need only be arranged on the sieve surface in a direction along the granulated slag conveying direction, and strictly speaking, it is not necessary to maintain a parallel orientation with the granulated slag conveying direction in a plan view. It may have a slight angle in plan view with respect to the conveying direction. In addition, it is preferable that the crossing side rope 14A is arranged on the sieve surface in a posture orthogonal to the conveying direction of the granulated slag, but even if it is not orthogonal, it is possible to arrange it in a posture crossing the conveying direction. good. In other words, as long as the opening for classifying the objects is ensured, it may be arranged in any posture.

The cross-side rope 14A is constructed by coating a core material C made of steel with a urethane resin R (see FIG. 4A). is fixed to Furthermore, the left and right screen hooks 21 are engaged with clamping bars 22 , and the clamping bars 22 are fixed to the left and right side plates 20 via clamping bolts 23 . The tension of the crossing rope 14A is adjusted by reducing the tightening force of the clamping bolt 23. A member denoted by reference numeral 24 in FIG. 3 is a stopper member that suppresses upward movement of the clamping bar 22 due to tightening of the clamping bolt 23 .

The flow-side rope 14B is composed only of urethane resin R without a core material, and the top of the flow-side rope 14B and the lower part of the cross-side rope 14A are welded at the intersection so as to be positioned below the cross-side rope 14A. Fixed. The flow-side rope 14B and the crossing-side rope 14A need only be welded and fixed at least partially, and need not be welded at all crossings.

The intersecting rope 14A is sandwiched from above and below by a pair of upper and lower intermediate holding plates 25 provided at the center via intermediate rubber plates 26 so as not to bend downward due to the weight of the granulated slag P. It is supported by a plurality of support frames 27 provided between the central portion and the left and right side walls and cushioning materials 28 provided on the support frames 27 .

The crossing side rope 14A has a first height (H1) which is the height to the top of the crossing side rope 14A based on the top enveloping surface of the flow side rope 14B, that is, the vertical height of the crossing side rope 14A. It is configured with a crossing side rope 14A1 and a second crossing side rope 14A2 having a second height (H2) higher than the first height (H1), and the second crossing side rope 14A2 functions as the weir 1 described above. is configured to When a plurality of second crossing side ropes 14A2 are installed, the second crossing side ropes 14A2 are distributed between the first crossing side ropes 14A1 along the conveying direction of the objects to be classified (Fig. 4A). reference).

The second height (H2) is set to be equal to or larger than the classification average diameter of the objects to be classified so that at least the second crossing rope 14A2 functions well as the weir 1 described above. The second crossing side rope 14A2 is formed integrally with the sieve surface 14 by fixing the left and right ends of the core material C made of steel to the screen hooks 21 in the same manner as the first crossing side rope 14A1. Therefore, there is no need to install the weir 1 as a separate member on the sieve surface 14 of the screen mechanism 13 , and the screen hook 21 can firmly fix the screen mechanism 13 .

The second crossing side rope 14A2 functions as a weir 1 higher than the first crossing side rope 14A1, a large amount of granulated slag is put into the vibrating screen device, and the first crossing side rope 14A1 and the flow side rope Even when the sieving surface 14 composed of 14B runs smoothly, the weir effect of the second crossing side ropes 14A2 enables efficient classification.

As shown in FIG. 4(b), it is preferable that the interval L between the second crossing side ropes 14A2 is set to be shorter toward the downstream side along the conveying direction D of the water granulated slag to be classified. Furthermore, it is preferable that the second height (H2) of the second crossing side rope 14A2 is set to be lower toward the downstream side along the conveying direction of the granulated slag.

As the granulated slag is conveyed from the upstream side to the downstream side, the classification process progresses, and the volume of the water granulated slag decreases toward the downstream side. Therefore, if the second crossing side ropes are arranged so that the interval between the second crossing side ropes becomes shorter toward the downstream side along the conveying direction of the water granulated slag, even if the sieve surface is short in the conveying direction, The entire sieve surface can be effectively used for efficient classification, and the size of the device can be reduced.

In addition, if the height of the second intersection side rope 14A2 is the same as the height of the second intersection side rope 14A2 on the upstream side on the downstream side where the classification progresses and the size of the granulated slag lumps becomes smaller, the water granulated slag Although there is a risk that the granulated slag jumps and the efficiency of conveying downstream of the second crossing side rope 14A2 decreases, the second height (H2) is set to be lower toward the downstream side along the conveying direction of the granulated slag. If so, it becomes possible to efficiently classify the entire conveying surface from the upstream side to the downstream side.

Furthermore, when the first height (H1) of the first crossing side rope 14A1 is set to be equal to or greater than the classification average diameter of the object to be classified, the first crossing side rope 14A1 can also function as the weir 1, and the The classification process can proceed efficiently.

That is, by arranging the crossing side rope 14A above the flow side rope 14B, the crossing side rope 14A arranged so as to face the conveying direction of the granulated slag functions as a weir 1 that temporarily retains the granulated slag. Then, by contact or collision between the aggregated water granulated slag and the crossing side rope 14A and/or the aggregated water granulated slag P, the granulated slag can be dispersed in a state before aggregation and can be efficiently classified and dropped from the corresponding sieve surface. become able to.

In summary, the second height (H2) of the second crossing side ropes 14A2 is constant, and the interval L between the second crossing side ropes 14A2 becomes shorter toward the downstream side along the conveying direction D of the granulated slag. The interval L between the second crossing side ropes 14A2 is constant along the conveying direction D of the crushed slag, and the second height (H2) of the second crossing side ropes 14A2 is lower toward the downstream side along the conveying direction of the water granulated slag. In this mode, the distance L between the second crossing side ropes 14A2 becomes shorter toward the downstream side along the conveying direction D of the granulated slag, and the second height (H2) of the second crossing side ropes 14A2 becomes lower toward the downstream side. Any of the aspects can be employed. The second height (H2) of the second crossing side ropes 14A2 is constant along the conveying direction D of the classified object, and the interval L between the second crossing side ropes 14A2 is set constant. is the basic configuration.

When the sieve surface is formed by the ropes 14A on the crossing side and the ropes 14B on the flow side, a stable vibrating state can be realized even when vibrated by the vibrating mechanism 18, and a compact and durable vibrating sieve device can be obtained. realizable.

The cross-section ropes 14A1 and the flow-side ropes 14B have a circular cross section, a diameter of about 2.6 mm to 3.0 mm, and a sieve surface opening of about 6 mm. That is, the pitch of the crossing side ropes 14A is set to 8.6 to 9.0 mm along the conveying direction of the granulated slag, and the second crossing side ropes 14A2 are arranged at intervals of 100 to 250 mm.

That is, the screen mechanism 13 includes a plurality of crossing side ropes 14A arranged in a direction intersecting the granulated slag conveying direction and a plurality of flow side ropes 14B arranged in a direction along the granulated slag conveying direction. and at least a part of the crossing side rope 14A is configured to function as a weir 1 for temporarily retaining granulated slag.

In this embodiment, the second crossing rope 14A2 is arranged above the flow side rope 14B in the entire width direction of the sieve surface crossing the flow side rope 14B. When processing is performed, a mode in which a portion along the width direction is arranged on the upper side of the flow-side rope 14B may be used. For example, of the two second crossing side ropes 14A2 arranged upstream and downstream along the conveying direction of the classified object, the second crossing side rope 14A2 on the upstream side A configuration in which the second crossing rope 14A2 on the downstream side is arranged above the flow side rope 14B only on the other side from the center in the width direction is arranged on the upper side of the flow side rope 14B only on the other side. It may be configured such that it is repeated along the conveying direction.

[Specific configuration of screen mechanism]
A specific configuration of the screen mechanism 14 in which the crossing side ropes functioning as the weir 1 is arranged will be described below.
In FIG. 4( a ), the flow side rope 14 B, the first crossing side rope 14 A 1 and the second crossing side rope 14 A 2 are configured. A screen mechanism 14 is shown in which the second height (H2) of 14A2 is set to be equal to or greater than the classification average diameter of the object to be classified.

In the mode shown in FIG. 4(a), the flow side rope 14B that receives the load of the granulated slag separates from the intersection side ropes 14A1 and 14A2 that are welded at the intersection and hangs down, resulting in a state in which classification is impossible. In case there is a risk, as shown in FIG. 5(a), the flow-side rope 14B is installed at the corresponding positions of the first crossing-side rope 14A1U and the second crossing-side rope 14A2U arranged above the flow-side rope 14B. The first crossing side ropes 14A1D may be provided on the lower side of each of them and fused and fixed to the flow side ropes 14B.

At this time, the first crossing side rope 14A1D provided below the flow side rope 14B is composed of a rope in which a core material C made of steel is coated with urethane resin R, and is provided above the flow side rope 14B. The second crossing side rope 14A2U may be composed only of the urethane resin R without the core material C. In addition, the upper second crossing side rope 14A2U and the lower first crossing side rope 14A1D are alternately arranged with the rope with the core material C and the rope with only the urethane resin R, and the upper and lower ropes with the core material C are arranged. may be installed so as to be adjacent along the direction of conveyance of the granulated slag. In this specification, both the ropes 14A1D and 14A1U arranged in the direction intersecting with the flow-side rope 14B are referred to as first crossing-side ropes.

As shown in FIG. 5B, both the first intersection side rope 14A1D provided on the lower side of the flow side rope 14B and the first intersection side rope 14A1U provided on the upper side of the flow side rope 14B are made of steel. A rope having a core material C coated with urethane resin R may be adopted, and the ropes may be alternately arranged along the transport direction of the granulated slag. Since the flow-side rope 14B is sandwiched between the first crossing-side ropes 14A1U and 14A1D, the stress acting on the fused and fixed portion can be dispersed, and the rope can be fixed more firmly.

When the first crossing ropes 14A1U and 14A1D are arranged in a staggered manner with the flow side rope 14B interposed therebetween, if the first crossing ropes 14A1U and 14A1D are fixed to the screen hooks 21 in a row at the same height, the Since there is a possibility that the side ropes 14B may bend in the vertical direction due to unnecessary force applied thereto, it is preferable that the fixed portions to the screen hooks 21 are arranged in a staggered arrangement in the vertical direction. As a result, the flow-side rope 14B does not bend vertically, and the vertical height of the second crossing-side rope 14A2U functioning as a weir can be stably maintained.

Furthermore, as shown in FIG. 5(c), it may be configured such that the strip-shaped downflow side rope 14B is fused to the second crossing side rope 14A2U functioning as the beam 1. As shown in FIG.

In FIGS. 4(a), (b), and FIGS. 5(a) to (c) described above, the core material C made of steel is indicated by a black circle, and the fusion between the flow-side rope 14B and the crossing-side rope 14A is shown. The attachment portion is indicated by a thick black line.

That is, it is preferable that the crossing-side ropes for supporting the current-side ropes are arranged at a position corresponding to one of the crossing-side ropes below the current-side ropes. Even if the side ropes are separated from the crossing side ropes due to the weight of the objects to be classified, the supporting state can be maintained by the crossing side ropes for support, so durability performance is improved.

In addition, it is preferable that the crossing-side rope for supporting the current-side rope is arranged at a position corresponding to one of the gaps of the crossing-side rope below the current-side rope. Even if the flow-side rope separates from the cross-side rope due to the weight of the object to be classified, the support state can be maintained by the cross-side rope for support, so durability performance is improved. Since the sieve surface is composed of the flow-side ropes, the cross-side ropes arranged above the flow-side ropes, and the supporting cross-side ropes arranged below, the number of cross-side ropes functioning as weirs can be adjusted. This makes it possible to appropriately adjust the amount of objects to be classified that remain upstream of each crossing rope.

In short, it is preferable that the crossing side ropes 14A1D for support are arranged below the flow side ropes 14B. The cross-side support rope 14A1D is configured by coating a core material C made of steel with urethane resin R, and the core material C is fixed to the left and right screen hooks 21 at both left and right ends of each of the cross-side support ropes 14A1D. can be configured as In this case, there is no need to provide the crossing side rope 14A1 with the core material C made of steel, and it is not necessary to fix both ends of the core material C to the left and right screen hooks 21 .

As described above, the screen mechanism 13 according to the present invention is arranged so as to intersect the plurality of crossing side ropes 14A arranged in the direction crossing the conveying direction of the classified objects and the crossing side ropes 14A in plan view. and a plurality of flow-side ropes 14B forming a sieve surface with a predetermined mesh size between them and the intersection-side ropes 14A, and at least one of the intersection-side ropes 14A functions as a weir for temporarily retaining the objects to be classified. As long as it is arranged above the flow side rope.

A plurality of balls 30 made of an elastic material such as rubber are placed in the space between the sieve surface 14 and the bottom plate 29 shown in FIG. Preferably, a cleaning mechanism is provided to remove clogging of the sieve surface 14 by hitting the sieve surface 14 with the bouncing balls 30 .

Even if fine grains containing moisture, which are objects to be classified, tend to adhere to the openings of the sieve surface, the cleaning mechanism eliminates the clogging of the sieve surface, so that continuous sieving can be performed. become.

In the above-described embodiment, an example in which the flow-side rope 14B and the first intersection-side rope 14A1 have circular cross-sectional shapes has been described, but the shape of the flow-side rope 14B and the first intersection-side rope 14A1 is limited to a circle. Instead, it may be a flat rectangular shape or an elliptical shape.

In the above-described embodiment, an example in which the cross-sectional shape of the second crossing side rope 14A2 is a cone with a rounded end has been described, but the cross-sectional shape of the second crossing side rope 14A2 is not limited to such a shape. Needless to say, a triangular shape, an elliptical shape, a rectangular shape, or the like can be appropriately set.

As described above, the vibrating sieve method according to the present invention is a vibrating sieve method in which a screen mechanism having a sieve surface with a predetermined mesh size is vibrated to classify an input classification object while conveying it. , arranged in a direction intersecting the conveying direction of the object to be classified, arranged in a direction along the conveying direction of the object to be classified, and a plurality of intersecting ropes, and fixed to the intersecting rope below the intersecting rope An object to be classified is put into the sieve surface from the upstream side of the sieve surface, temporarily retained on the crossing side rope and classified, and jumps over the crossing side rope. By repeating the process of classifying the objects to be classified while temporarily staying on the next crossing side rope, the objects to be classified that have properties of cohesiveness or adhesion by adhering water, or having both properties are classified. It is configured.

The specific configuration of each part described in the above embodiment is merely an example, and it goes without saying that the shape, size, material, etc., can be changed and designed as appropriate within the scope of the effects of the present invention.

1: Weir 2: Guide member 10: Vibrating screen device 13: Screen mechanism 14: Screen surface 14A: Crossing side rope 14A1: First crossing side rope 14A2: Second crossing side rope 14B: Flow side rope 16: First recovery part 17: Second recovery unit 18: Vibration mechanism C: Core material P: Object to be classified R: Urethane resin S: Screen

Claims (5)

A sieve with a predetermined opening between a plurality of crossing side ropes arranged in a direction crossing the conveying direction of the classified object and the crossing side ropes arranged so as to cross the crossing side ropes in a plan view. A plurality of flow-side ropes forming a surface are provided, and the vertical height of the crossing-side rope is set to be equal to or greater than the classification average diameter of the object to be classified with reference to the top enveloping surface of the flow-side rope. The vertical height is set to be less than the classification average diameter of the classification target with reference to the crossing side rope that functions as a weir that temporarily retains the classification target, and the top envelope surface of the flow side rope. There is a crossing-side rope that does not function as a weir for temporarily retaining the water, and the crossing-side ropes that function as the weir are arranged above the flow-side ropes in a conveying direction with the crossing-side rope that does not function as a weir in between. The crossing side rope functioning as a weir is a screen mechanism in which the height in the vertical direction is set to be equal to or larger than the classification average diameter of the objects to be classified, with reference to the top envelope surface of the flow side rope. 2. The screen mechanism according to claim 1, wherein the interval between the intersecting ropes functioning as said weirs is set to become narrower toward the downstream side along the conveying direction of the objects to be classified. 3. The screen mechanism according to claim 1 or 2, wherein the height in the vertical direction based on the top enveloping surface of the flow-side rope is set to be lower toward the downstream side along the conveying direction of the classified objects. Vibration for classifying an object to be classified that has been put into the screen mechanism while conveying it in the conveying direction, comprising: the screen mechanism according to any one of claims 1 to 3; and a vibrating mechanism that vibrates the screen mechanism. Sieve device. A vibrating sieve method in which a screen mechanism on which a sieve surface with a predetermined mesh size is formed is vibrated to classify while conveying an input classification target,
As the screen mechanism, a plurality of cross-side ropes arranged in a direction intersecting the conveying direction of the object to be classified, and a predetermined A plurality of flow-side ropes that constitute the sieve surface of the mesh opening of
The intersection side rope functions as a weir that temporarily retains the objects to be classified by setting the height in the vertical direction to be equal to or greater than the classification average diameter of the objects to be classified, with reference to the top envelope surface of the rope on the flow side. There is a rope and a crossing side rope that does not function as a weir for temporarily retaining the objects to be classified because the vertical height is set to be less than the classification average diameter of the objects to be classified, based on the top enveloping surface of the rope on the flow side, A plurality of crossing-side ropes functioning as weirs are arranged above the flow-side ropes with intersecting-side ropes not functioning as weirs in the conveying direction. Using a screen mechanism whose height in the vertical direction is set to be equal to or greater than the classification average diameter of the object to be classified with respect to the top envelope surface,
An object to be classified is introduced from the upstream side of the sieve surface, classified while being temporarily retained by the intersecting rope functioning as the weir, and the object to be classified that jumps over the intersecting rope functions as the next intersecting rope functioning as the next weir. A vibrating sieve method in which the classification process is repeated while temporarily staying in the vibrating sieve.

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