JP2007069089A - Sizing/classifying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sizing/classifying apparatus whose removal efficiency of fine powder from small particles is improved without affecting the removal performance of fine powder from small particles by the input of the object to be sized. <P>SOLUTION: The sizing/classifying apparatus 100, which has a screening member 108 for classifying the object to be sized into coarse particles and small particles smaller than coarse particles and in which a coarse particle recovering port 112 for recovering coarse particles and a small particle recovering port 114 for recovering small particles are formed, is provided with: a receiving part 110 arranged below the screening member 108 for receiving small particles passing through the screening member 108; an vibrating part 104 for vibrating the receiving part 110 continuously to convey small particles on the receiving part 110 to the direction of the small particle recovering port 114; and an air circulating part 118 for circulating the air between the screening member 108 and the receiving part 110 to the direction other than the conveying direction of small particles to remove fine powder stuck to small particles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sizing / classifying device that divides a sized object into coarse particles and fine particles and removes fine powder adhering to the fine particles.

  Fine aggregates used in concrete, roads, etc. are prohibited from collecting natural sand such as rivers and seas in Japan, so use sand imported from abroad or artificially produced sand. It is manufactured. Here, it is difficult to guarantee the properties of sand imported from abroad, and it is not suitable for fine aggregates with high required performance such as coarse grain ratio (FM value) such as concrete. Often artificial sand is used which is stable. Among the artificial sands, those that are advantageous from the viewpoint of cost and supply amount are crushed sand obtained by crushing crushed stones and sizing and classifying them so as to obtain a predetermined particle size distribution. Here, “classification” means that a granular material is classified based on a predetermined particle diameter, and “classification” means that the granular material and fine powder are classified.

  In this type of crushed sand production facility, generally, a vibration sieve is used as a classification device, and an air separator is used as a classification device, and a spiral classifier is used as a classification device. In the classifier, the wet type that can easily and easily remove fine powder adhering to the sand having a relatively small particle size is superior, but the dry type treatment is mainly used due to the problem of waste water treatment. For the purpose of shortening the manufacturing process and reducing the equipment cost, a classifying and classifying apparatus in which a vibrating sieve and a dry classifying apparatus are combined has been proposed (for example, see Patent Document 1).

In this classifying / classifying apparatus, classification is performed by separating the fine particles from the fine particles by applying an air flow so as to face the fine particles and fine particles passing through the vibrating sieve and freely falling. In such a sizing / classifying apparatus, classification accuracy is improved by widely dispersing the object to be processed and increasing the contact distance with air. Therefore, the vibrating sieve is formed to be inclined, and air is circulated along the inclined shape of the vibrating sieve.
JP 2002-254035 A

However, in the above-mentioned classifying and classifying apparatus, air is applied to the processing object that falls freely, and therefore even fine powder adhering to the fine particles cannot be removed. Thereby, drastic improvement of the removal performance of fine powder is desired.
In addition, when the input amount of the sized object increases, if the air flow rate is increased, even fine particles that should become products will be removed by riding on the air flow, and if the air flow rate is not increased, fine powder will be removed. Performance decreases. Thus, there is also a problem that the fine powder removal performance depends on the input amount of the sized object.

  The present invention has been made in view of the above circumstances, and the object of the present invention is that the removal performance of fine powder from fine particles is not affected by the input amount of the sized object, and the fine particles can be removed. An object of the present invention is to provide a sizing device that can improve the removal efficiency of fine powder.

In order to achieve the above object, in the present invention,
A sieving member that sorts the sized object into coarse particles and fine particles smaller than the coarse particles, and a coarse particle collection port for collecting the coarse particles and a fine particle collection port for collecting the fine particles are formed. A size classification device,
A receiving portion that is provided below the sieve member and receives the fine particles that have passed through the sieve member on an upper surface formed substantially parallel to the sieve member;
The sieve member is vibrated, and the sized object on the sieve member is transferred to the coarse particle recovery port direction on the sieve member, and the receiving part is vibrated to receive the receiving member. A vibration unit for transferring the fine particles on the portion toward the fine particle collection port on the receiving unit;
There is provided an air sizing unit comprising an air circulation part that circulates air between the sieve member and the receiving part in a direction opposite to the direction in which the fine particles are transferred.

According to the sizing / classifying apparatus of the present invention, the fine particles that have passed through the sieve member are repeatedly received on the receiving part by vibration applied from the exciting part after being received by the receiving part. And a fine grain is transferred to a fine grain collection mouth direction, jumping on a receiving part.
At this time, an impact is applied to the fine particles at the time of splashing and landing, so that the fine powder adhering to the fine particles is peeled off from the fine particles. Further, since the fine particles are exposed to the circulating air when floating, the fine powder is separated from the fine particles by the air resistance received from the circulating air. The peeled fine powder rides on the circulating air and moves in a direction different from the direction in which the fine particles are transferred. In addition, the fine powder that has passed through the sieve member without adhering to the fine particles is moved downstream by riding on the circulating air before dropping to the receiving portion. Thereby, the fine particles from which the fine powder has been removed are collected from the fine particle collection port.

Further, according to this sizing / classifying device, since the air flow direction is opposite to the fine particle transfer direction, the air added to the fine particles by maximizing the relative speed of the fine particles to be transferred and the air is added. The resistance can be increased and the fine powder peeling efficiency can be further improved. Further, since the fine particles are slightly pushed back by the air when floating, it takes a long time to stay on the receiving portion until they move to the fine particle collection port. As a result, the number of vibrations applied to the fine particles increases, and this also improves the separation efficiency.
Moreover, in the sieving member and the receiving part, it is necessary to ensure a sufficient stroke in the transfer direction of the sizing object and the fine particles, and there is an opportunity for contact between the fine particles and the air by circulating air in the stroke direction. Sufficiently secured. Therefore, the space in the apparatus can be used efficiently.

Moreover, in the above sizing / classifying apparatus,
The upper surface of the receiving part can be formed to be substantially horizontal.

  According to this sizing / classifying apparatus, since the upper surface of the receiving portion is substantially horizontal, fine particles can be accurately held on the receiving portion.

Moreover, in the above sizing / classifying apparatus,
A feed unit for supplying the sizing object to the end of the sieving member opposite to the transfer direction of the sizing object;
The said sieve member can be set as the structure which has a holeless part and a net | network part in this order continuously regarding the transfer direction of the said sizing object.

  According to this sizing / classifying apparatus, when a sizing object is supplied from the feed unit, the sizing object first moves while being vibrated on the holeless portion. At this time, in the sized object, the granular material having a small diameter moves relatively downward, the granular material having a large diameter moves relatively upward, and the granular material is arranged in a layered manner.

Moreover, in the above sizing / classifying apparatus,
It can be set as the structure which provided the air discharge port which discharges air from the upstream of an air distribution direction toward the downward direction of the said holeless part of the said sieve member.

  According to this sizing / classifying apparatus, the air can be accelerated on the front side of the holeless portion by providing the air discharge port. At this time, since air does not flow upward from the sieve member at the holeless portion, the air flowing between the sieve member and the receiving portion can obtain a rectifying action.

Moreover, in the above sizing / classifying apparatus,
The mesh part is configured to continuously include a first mesh part and a second mesh part having a coarser mesh than the first mesh part in this order in the transfer direction of the sized object. it can.

According to this sizing / classifying device, the sized object enters the first mesh part in a state where it is stratified in the holeless part, and preferentially passes through the first mesh part from the granular material of the lower diameter. To do. Thereby, the granular material with a comparatively small diameter is reliably sized by the 1st net part.
Subsequently, the sized object enters the second net portion in a state where the granular material having a relatively small diameter is removed. In this 2nd net | network part, the granular material of the coarse particle size set by the sieving member and the fine particle size vicinity of a fine particle is selected centering around.

Moreover, in the above sizing / classifying apparatus,
It can be set as the structure which has arrange | positioned the air discharge port under the said 1st net part of the said sieve member.

  According to this sizing / classifying apparatus, the particulate matter having a relatively small diameter that has passed through the first mesh portion is directly exposed to the air discharged from the air discharge port. Since the granular material that has passed through the first mesh portion contains a lot of fine powder, it is possible to efficiently classify the fine powder by using the discharge energy of air without waste.

Moreover, in the above sizing / classifying apparatus,
At least a part of the receiving part may be configured as a sieve for separating fine particles smaller than the fine particles from the fine particles.

  According to this sizing / classifying apparatus, fine particles and fine particles can be sieved even in the receiving part. Fine particles that have passed through the receiving portion are obtained from below the receiving portion, and fine particles that have not been able to pass through the receiving portion are recovered at the fine particle collection port. Thereby, it can classify into a coarse grain, a fine grain, a fine grain, and a fine powder.

Moreover, in the above sizing / classifying apparatus,
Forming a holeless portion below the holeless portion of the sieve member in the receiving portion,
The air flow path between the sieving member and the receiving part defines a rectifying chamber whose upper part is closed by the holeless part of the sieving member and whose lower part is closed by the holeless part of the receiving part. It is possible to have a configured configuration.

  According to this sizing / classifying device, since the rectifying chamber whose upper and lower portions are blocked by each holeless portion is defined, the air flow can be stabilized and fine powder can be collected accurately.

Moreover, in the above sizing / classifying apparatus,
A configuration may be adopted in which a flow restriction plate is provided above the holeless portion of the receiving portion and blocks a part of the air flow path so that the plate surface is substantially directed in the flow direction.

  According to this sizing / classifying apparatus, when the particulate matter riding on the circulation air collides with the distribution restriction plate, the particulate matter falls toward the holeless portion of the receiving portion. Thereby, only the fine powder that has passed through the flow regulating plate moves further to the downstream side, and the fine particles and fine particles are knocked down onto the receiving portion. Therefore, when the fine particles and the fine particles get on the circulating air, the fine particles and the fine particles can be guided onto the receiving portion.

Moreover, in the above sizing / classifying apparatus,
At least a part of the flow restriction plate may be configured to incline downward toward the upstream side in the air flow direction.

  According to this sizing / classifying device, since at least a part of the flow regulating plate is inclined upstream in the air flow direction, the fine particles and fine particles that collide with the flow regulating plate and fall are guided upstream. Can do.

Moreover, in the above sizing / classifying apparatus,
The air inlet provided on the downstream side of the flow regulating plate and containing the fine powder;
And a flow rate adjusting plate disposed in the vicinity of the suction port.

  According to this sizing / classifying device, fine powder riding on the circulating air is collected from the suction port. Here, by adjusting the air flow rate with the flow rate adjusting plate, the coarse particle rate (FM value) of the product obtained by adjusting the fine powder removal rate can be adjusted, which is extremely advantageous in practical use.

Thus, according to the present invention, since the fine particles are once received by the receiving portion and exposed to the circulating air while being vibrated, the conventional method of applying air to the fine particles falling by its own weight toward the recovery port Compared with those, the removal efficiency of fine powder from fine particles can be remarkably improved.
In addition, since fine particles are once received and vibrated by the receiving part, the fine powder removal performance depends on the amount of the sized object to be injected, as in the conventional case where air is applied to the fine particles during free fall. It is possible to always exhibit stable fine powder removal performance.

  FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a side sectional view showing a schematic configuration of a size classification device. FIG. It is explanatory drawing which shows.

  As shown in FIG. 1, the sizing / classifying apparatus 100 includes an apparatus main body 102 to which a sized object is supplied, and a vibration unit 104 that vibrates the apparatus main body 102 as a whole. In the present embodiment, the sizing object is crushed sand crushed by a pulverizer, and as shown in FIG. 2, a granular material (coarse particles) having a particle size exceeding about 4.0 mm and a particle size of about A granular material (fine particle) of 1.3 mm to about 4.0 mm, a granular material (fine particle) of a particle size of about 0.075 mm to about 1.3, and a fine particle of a particle size of about 0.075 mm or less. Size and classify. Here, “classification” means that a granular material is classified based on a predetermined particle diameter, and “classification” means that the granular material and fine powder are classified.

  The apparatus main body 102 is grounded outside the apparatus via a suspension (not shown) having a spring, for example. The vibration unit 104 transmits the rotational motion output from the motor 104a to the motion conversion mechanism 104c via the belt 104b or the like. The rotational motion is converted into elliptical vibration by the motion conversion mechanism 104c, and the apparatus main body 102 is vibrated in an oblique direction.

  Here, as shown in FIG. 1, the apparatus main body 102 includes a feed box 106 as a feed unit for supplying a sizing object, and the sizing object into coarse particles and fine particles smaller than the coarse particles. A sieve member 108 to be selected and a receiving portion 110 that is provided below the sieve member 108 and receives fine particles that have passed through the sieve member 108. In the present embodiment, the upper surface of the receiving portion 110 is formed substantially horizontally, and the sieve member 108 is formed substantially parallel to the upper surface of the receiving portion 110. Moreover, a part of the receiving part 110 is a sieve finer than the sieve member 108, and fine particles are further divided from the fine particles. The apparatus main body 102 is formed with a coarse particle collection port 112 for collecting coarse particles, a fine particle collection port 114 for collecting fine particles, and a fine particle collection port 116 for collecting fine particles.

  The vibration unit 104 applies vibration in an oblique direction (upper right direction and lower left direction in FIG. 1) to the apparatus main body 102 to vibrate the sieve member 108 and the receiving unit 110 and perform sizing. That is, the sieve member 108 and the receiving part 110 function as a vibrating sieve. Here, the vibration unit 104 continuously vibrates the receiving unit 110 and transfers fine particles on the receiving unit 110 toward the fine particle collection port 114 on the receiving unit 110. In addition, the vibration unit 104 continuously vibrates the sieve member 108 and transfers the sized object on the sieve member 108 in the same direction as the fine particle transfer direction on the sieve member 108. That is, the vibration unit 104 is shared by the sieve member 108 and the receiving unit 110.

  In addition, the sizing / classifying device 100 includes an air circulation unit 118 that circulates air between the sieve member 108 and the receiving unit 110 in a direction different from the direction in which the fine particles are transferred. Thereby, the fine powder adhering to the fine particles is removed, and so-called air classification is performed. The air circulation unit 118 circulates air in the direction opposite to the direction in which the object to be sized and the fine particles are transferred by the vibration unit 104.

  As shown in FIG. 1, the feed box 106 and the sieve member 108 are continuously arranged in the horizontal direction, and the feed box 106 is sized at the end of the sieve member 108 opposite to the transfer direction of the sized object. Supply the object. The sieving member 108 has a holeless portion 108a, a first mesh portion 108b, and a second mesh portion 108c successively in this order in the transfer direction of the sized object. That is, the first mesh portion 108b and the second mesh portion 108c constitute a mesh portion of the sieve member 108.

  Further, the sieve member 108 and the coarse particle collection port 112 are also continuously arranged in the horizontal direction, and the coarse particles remaining on the sieve member 108 are guided to the coarse particle collection port 112 as they are by the transfer by the vibration unit 104. The The coarse particle collection port 112 is formed on the side surface of the apparatus main body 102. In the present embodiment, the coarse particles collected from the coarse particle collection port 112 are not products, and are conveyed again to the pulverizer by the conveyance mechanism outside the apparatus.

  As shown in FIG. 1, the hole-free portion 108a of the sieve member 108 is not formed with any holes, and not only the particulate matter but also the air flow is prevented. The first mesh portion 108b has a mesh of about 2.0 mm, and a granular material having a particle size of about 2.0 mm or less falls among the sized objects. According to the above definition of fine powder, fine grain and fine grain, fine powder, fine grain and relatively small fine grain will be sieved. Further, the second mesh portion 108c has a mesh of about 4.0 mm, and a granular material having a particle size of about 4.0 mm or less falls among the sized objects. Here, fines, fines and all fines are sieved out.

  The upper part of the feed box 106 and the sieve member 108 is covered with a dust-proof hood 200 together with the motion conversion mechanism 104 c of the vibration unit 104. The dust hood 200 is connected to a dust collection pipe 202 for collecting fine powder. In addition, the dustproof hood 200 is formed with a loading port 204 for loading a sized object into the apparatus main body 102. The input port 204 is formed almost directly above the feed box 106.

  As shown in FIG. 1, the receiving part 110 is distribute | arranged directly under the sieve member 108, and the mesh is formed in about 1.3 mm. Thereby, a fine particle and a fine particle will be sieved. In addition, a holeless portion 110a is also formed on the side of the receiving portion 110 opposite to the fine particle transfer direction. As shown in FIG. 1, the holeless portion 110 a of the receiving portion 110 is formed below the holeless portion 108 a of the sieve member 108. The hole-free portion 110a of the receiving portion 110 is also not formed with any holes, and not only the particulate matter but also the air flow is prevented.

  As shown in FIG. 1, the end of the receiving portion 110 in the transfer direction is open, and a fine particle collection port 114 is formed below the open portion. In addition, a particulate collection port 116 is formed immediately below the receiving portion 110 to collect the fine particles that have passed through the receiving portion 110. A recovery hopper 206 is disposed below the fine particle recovery port 116.

  The air circulation unit 118 introduces air into the apparatus main body 102 from an introduction port 120 formed on the side surface of the apparatus main body 102 and distributes the air in the apparatus main body 102. In the present embodiment, the introduction port 120 is disposed below the coarse particle collection port 112 on the side surface of the apparatus main body 102. As shown in FIG. 1, the inlet 120 is formed on the upstream side in the air flow direction between the sieve member 108 and the receiving portion 110. Further, a suction port 122 is formed on the downstream side in the air flow direction between the sieve member 108 and the receiving portion 110, and fine powder is collected together with air. A dust collection pipe 208 for collecting fine powder is connected to the suction port 122.

An air jet 124 is disposed below the first mesh portion 108b of the sieve member 108. As shown in FIG. 1, two air jets 124 as air discharge ports are juxtaposed in the vertical direction, and discharge air from the upstream side in the air flow direction toward the lower side of the holeless portion 108 a of the sieve member 108. . Here, since the air jet 124 below the first net portion 108b discharges a relatively large amount of air at a relatively high speed, the top and bottom portions 108a, 110a are arranged so that the fine particles are not transported together with the air.
An air jet 126 is also disposed below the second mesh portion 108c. The air discharge state of the air jet 126 below the second mesh portion 108c is lower and smaller than that of the air jet 124 below the first mesh portion 108b.

  As shown in FIG. 1, a flow restriction plate 128 is disposed on the downstream side of each air jet 124 of the first net portion 108 b and above the holeless portion 110 a of the receiving portion 110. The flow regulating plate 128 is installed so as to block a part of the air flow path and direct the plate surface in the flow direction. That is, the flow restricting plate 128 is formed so as to extend substantially vertically in a side cross section (see FIG. 1). The lower end side of the flow restriction plate 128 is inclined downward toward the upstream side (right side in FIG. 1) in the air flow direction. In addition, the distribution restriction plate 128 is rotatable, and the angle can be adjusted with respect to the distribution direction.

  A flow rate adjusting plate 130 is disposed in the vicinity of the suction port 122. The flow rate adjusting plate 130 is also installed so as to block a part of the air flow path and direct the plate surface in the flow direction. That is, the flow regulating plate 130 is installed so as to extend substantially vertically in the side surface cross section. The flow rate adjusting plate 130 is also rotatable, and the angle can be adjusted with respect to the flow direction.

The sizing and classification in the sizing / classifying apparatus 100 configured as described above will be described with reference to FIG.
When a sized object is input from the input port 204 of the dust-proof hood 200 from a vibration feeder or the like, the sized object is dropped into the feed box 106 by its own weight. The sized object in the feed box 106 moves to the sieve member 108 due to the vibration of the vibrating unit 104.

  When the sizing object is supplied from the feed box 106 to the sieve member 108, the sizing object first moves while being vibrated on the holeless portion 108a. At this time, as shown in FIG. 2, the sizing object is such that the granular material having a small diameter moves relatively downward, the granular material having a large diameter moves relatively upward, and the granular material is layered. Be organized.

  In this way, the sized object enters the first mesh portion 108b in a state where it is stratified by the holeless portion 108a, and preferentially passes through the first mesh portion 108b from the granular material having a smaller diameter. Thereby, the granular material with a comparatively small diameter is reliably sized by the 1st net | network part 108b. In the present embodiment, a granular material having a particle size of up to about 2.0 mm is divided.

  Subsequently, the sized object enters the second mesh portion 108c in a state where the particles having a relatively small diameter are removed. In the second mesh portion 108c, the coarse particles set by the sieve member 108 and the granular materials in the vicinity of the fine particle size are selected. In the present embodiment, a granular material having a particle size of about 2.0 mm to about 4.0 mm is divided. As a result, coarse particles exceeding about 4.0 mm are guided to the coarse particle collection port 112.

As shown in FIG. 2, the fine particles that have passed through the sieve member 108 fall by their own weight and are received by the receiving portion 110. The fine particles are repeatedly bounced up on the receiving unit 110 by vibration applied from the vibration unit 104. Here, since the upper surface of the receiving part 110 is substantially horizontal, the fine particles are properly held on the receiving part 110. Then, the fine particles are transferred toward the fine particle collection port 114 while jumping on the receiving portion 110.
At this time, since the impact is applied to the fine particles at the time of jumping up and landing, the fine powder and fine particles adhering to the fine particles are peeled off from the fine particles. Further, since the fine particles are exposed to the circulating air when floating, the fine powder is separated from the fine particles by the air resistance received from the circulating air. The peeled fine powder rides on the circulating air and moves in a direction different from the direction in which the fine particles are transferred. Note that the fine powder that has passed through the sieve member 108 without adhering to the fine particles moves downstream by riding on the circulating air before dropping to the receiving portion 110. Thereby, the fine particles from which the fine powder has been removed are collected from the fine particle collection port 114.

  Here, the particulate matter having a relatively small diameter that has passed through the first mesh portion 108 b is directly exposed to the air discharged from each air jet 124. Since the granular material that has passed through the first mesh portion 108b contains a large amount of fine powder, it is possible to efficiently classify the fine powder by using air discharge energy without waste.

  In the present embodiment, as described above, since the receiving part 110 is a sieve, the receiving part can be sieved into fine particles and fine particles. Fine particles that have passed through the receiving portion 110 are obtained from the fine particle collection port 116 below the receiving portion 110, and fine particles that have not been able to pass through the receiving portion are collected in the fine particle collecting port 114. From 122, the fine powder on the circulating air is collected. Thereby, in the classification apparatus 100, it can classify into a coarse grain, a fine grain, a fine grain, and a fine powder.

  Further, since the air flow direction between the sieve member 108 and the receiving part 110 is opposite to the fine particle transfer direction, the relative velocity between the fine particles to be transferred and the air is maximized and added to the fine particles. The air resistance to be increased can be increased, and the fine powder peeling efficiency can be improved. Further, since the fine particles are slightly pushed back by the air when floating, the time for staying on the receiving portion 110 until the fine particles move to the fine particle collection port 114 becomes long. As a result, the number of vibrations applied to the fine particles increases, and this also improves the separation efficiency.

  Furthermore, in the sieving member 108 and the receiving part 110, it is necessary to ensure a sufficient stroke in the direction of transfer of the sized object and the fine particles, and contact of the fine particles with the air by circulating air in this stroke direction. Opportunities are also fully secured. Therefore, the space in the apparatus can be used efficiently.

  In addition, as shown in FIG. 2, when the particulate matter riding on the circulating air collides with the circulation regulating plate 128 between the sieve member 108 and the receiving portion 110, the granular matter moves to the holeless portion 110 a of the receiving portion 110. Falling towards. As a result, only the fine powder that has passed through the flow restricting plate 128 moves further to the downstream side, and the fine particles and fine particles are knocked down onto the receiving portion 110. Therefore, when the fine particles and the fine particles get on the circulating air, the fine particles and the fine particles can be guided onto the receiving portion 110. Here, since the lower end side of the flow restriction plate 128 is inclined toward the upstream side in the air flow direction, fine particles and fine particles that collide with the flow restriction plate 128 and fall can be guided to the upstream side.

  Further, by adjusting the air flow rate with the flow rate adjusting plate 130, the coarse particle rate (FM value) of the product obtained by adjusting the fine powder removal rate can be adjusted, which is extremely advantageous in practical use.

  In addition, air does not flow upward from the sieve member 108 at the holeless portion 108 a of the sieve member 108, and air does not flow downward from the receiving portion 110 at the holeless portion 110 a of the receiving portion 110. A rectifying action of the circulating air between the member 108 and the receiving portion 110 can be obtained. An air jet 124 is provided below the first mesh portion 108b to promote fine powder separation, and fine particles and the like are carried from above the sieve member 108 and below the receiving portion 110 by the holeless portions 108a and 110a. This can be prevented. Further, air circulation can be assisted by the air jet 126 below the second mesh portion 108c. The upper and lower portions are closed by the holeless portions 108a and 110a, and a classification chamber 132 (see FIG. 1) as a rectifying chamber partitioned by the flow regulating plate 128 and the flow rate adjusting plate 130 in the air flow direction is defined. ing. Since the air flow is stabilized in the classification chamber 132, the fine powder can be collected accurately.

As described above, according to the sizing / classifying apparatus 100 of the present embodiment, the fine particles are once received by the receiving portion 110 and exposed to the circulating air while being vibrated, so that they fall by their own weight toward the collection port. Compared with the conventional method in which air is applied to fine particles, the removal efficiency of fine powder from fine particles can be remarkably improved.
In addition, since the fine particles are once received and vibrated by the receiving part 110, the amount of the sizing object to which fine powder removal performance is input as in the conventional one in which air is applied to the fine particles during free fall. There is no dependence, and stable removal performance of fine powder can always be exhibited.

  In the above-described embodiment, the receiving part 110 is a sieve, and a granular material having three kinds of particle sizes is obtained. However, the receiving part 110 may be a simple plate member or the like. In this case, a granular material with two types of particle sizes can be obtained.

  In the above embodiment, the air flow direction is the direction opposite to the fine particle transfer direction on the receiving portion 110, but the air flow direction is not limited and is different from the transfer direction. Any direction is acceptable.

  Moreover, in the said embodiment, although the upper surface of the receiving part 110 was shown substantially horizontal, if a fine grain can be hold | maintained to such an extent that it does not slide down with dead weight, it does not need to be substantially horizontal. Further, although the sieve member 108 is shown as a substantially horizontal vibrating sieve, it may be configured to be inclined, for example, and the sieve member 108 is configured as long as it has a coarse particle and fine particle sizing function. Is optional.

  In addition, the shape, arrangement state, presence / absence of installation, etc. of the flow regulating plate 128, the flow rate adjusting plate 130, etc. can be arbitrarily set according to the specifications of the apparatus, and other specific detailed structures etc. Of course, it can be changed.

1 is a side sectional view showing a schematic configuration of a sizing / classifying apparatus according to an embodiment of the present invention. It is explanatory drawing which shows the sizing object and the flow of air in a sizing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Size classification apparatus 102 Apparatus main body 104 Excitation part 104a Motor 104b Belt 104c Motion conversion mechanism 106 Feed box 108 Sieve member 108a No hole part 108b First net part 108c Second net part 110 Receipt part 110a No hole part 112 Coarse Granule recovery port 114 Fine particle recovery port 116 Fine particle recovery port 118 Air circulation part 120 Inlet port 122 Suction port 124 Air jet 126 Air jet 128 Flow regulating plate 130 Flow rate adjusting plate 132 Classifying chamber 200 Dustproof hood 202 Dust collection tube 204 Input port 206 Recovery hopper 208 Dust collection tube

Claims (11)

A sieving member that sorts the sized object into coarse particles and fine particles smaller than the coarse particles, and a coarse particle collection port for collecting the coarse particles and a fine particle collection port for collecting the fine particles are formed. A size classification device,
A receiving portion that is provided below the sieve member and receives the fine particles that have passed through the sieve member on an upper surface formed substantially parallel to the sieve member;
The sieve member is vibrated, and the sized object on the sieve member is transferred to the coarse particle recovery port direction on the sieve member, and the receiving part is vibrated to receive the receiving member. A vibration unit for transferring the fine particles on the portion toward the fine particle collection port on the receiving unit;
An air circulation unit that circulates air between the sieve member and the receiving part in a direction opposite to the direction in which the fine particles are transferred.   The size classification device according to claim 1, wherein an upper surface of the receiving portion is formed substantially horizontally. A feed unit for supplying the sizing object to the end of the sieving member opposite to the transfer direction of the sizing object;
The size classification device according to claim 1 or 2, wherein the sieve member has a holeless portion and a mesh portion in this order continuously in the transfer direction of the sized object.   The sizing / classifying apparatus according to claim 3, further comprising an air discharge port for discharging air from an upstream side in an air flow direction toward a lower side of the holeless portion of the sieve member.   The mesh portion has a first mesh portion and a second mesh portion having a coarser mesh than the first mesh portion in this order in the transfer direction of the sized object. The size classification apparatus according to claim 3 or 4.   The size classification device according to claim 5, wherein an air discharge port is disposed below the first mesh portion of the sieve member.   The size classification according to any one of claims 3 to 6, wherein at least a part of the receiving portion is a sieve for separating fine particles smaller than the fine particles from the fine particles. apparatus. Forming a holeless portion below the holeless portion of the sieve member in the receiving portion,
The air flow path between the sieving member and the receiving part defines a rectifying chamber whose upper part is closed by the holeless part of the sieving member and whose lower part is closed by the holeless part of the receiving part. The sizing / classifying apparatus according to claim 7, wherein   The distribution regulating plate according to claim 8, further comprising a flow regulating plate disposed above the holeless portion of the receiving portion and blocking a part of the air flow path so that the plate surface is substantially directed in the flow direction. Grain classification device.   The size classification device according to claim 9, wherein at least a part of the flow restriction plate is inclined downward toward the upstream side in the air flow direction. The air inlet provided on the downstream side of the flow regulating plate and containing the fine powder;
The sizing / classifying device according to claim 9, further comprising a flow rate adjusting plate disposed in the vicinity of the suction port.

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