JP2008080282A - Sizing and classification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sizing and classification apparatus capable of precisely and efficiently separating fine particles from a particle mixture containing fine particles after sizing by increasing neither annex facilities nor running cost. <P>SOLUTION: The sizing and classification apparatus 1 comprises sizing means 4 for sizing object material M containing fine particles and classification means for circulating a transfer gas to the fine particles for classifying the fine particles immediately after sizing by making the fine particles following the current 5 of the transfer gas and louver blades 6 in multi-stages are installed slantingly as a whole to a transfer gas flow channel of the classification means to narrow the cross-sectional surface area where the transfer gas passes and thus the speed of the transfer gas passing the aperture parts between neighboring louver blades 6 is increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of a size classification apparatus, and more specifically, an object to be treated including coarse particles, coarse particles, fine particles, and fine powders is obtained by mixing coarse particles with coarse particles, fine particles, and fine particles (a mixture of fine particles). Coarse particles and fine particles, that is, a mixture of coarse particles, fine particles, and fine powder), and further separating the fine powder from the mixture of coarse particles, fine particles, and fine powder, The present invention relates to an improvement of a classification apparatus for dry classification of grains and fine grains.

  When separating coarse particles and fine particles from a processed material containing coarse particles, fine particles and fine powder, for example, crushed material obtained by crushing rocks, first, a sieve (sieving) sizing device is used. The object to be treated is divided into coarse particles, fine particles, and fine powder (hereinafter referred to as fine particles / fine powder), and the coarse particles, fine particles / fine powder are separately collected, and then the fine particles are collected. A method is adopted in which the particles and fine powder are transferred to a wet classifier by a belt conveyor, and fine particles are removed from the fine particles and fine powder by this wet classifier to remove the fine particles, thereby separating the fine particles. It was.

  However, in such a method, a large site is required for the sedimentation separation of the fine powder removed by wet classification, or an apparatus for removing the water by pressing the sedimentation separation is required, resulting in high processing costs. In addition, there is a disadvantage that it is necessary to treat the dehydrated cake obtained by the pressing.

  Therefore, instead of the wet classifier as a classifier, a dry classifier such as an air classifier (air separator) is used, and the dry classifier removes fine powder from the fine particles / fine powder by dry classification, A method for obtaining fine particles separately has been proposed and adopted. Such a conventional sizing technique will be described below with reference to FIG. FIG. 4 is a side sectional view showing an outline of a conventional sizing / classifying apparatus.

  In the classification and classification technique according to this conventional example, a classification element (sieving mesh) 54 for classifying an object to be processed including fine powder and fine powder immediately after the classification are accompanied by the flow of the transfer gas and classified. And a classifying unit having a classifying means for circulating the transfer gas to the fine powder as much as possible, and classifying the object to be processed by the size dividing element 54 and circulating the transfer gas in a dispersed state by the size classification. In this way, the fine powder is sent along with the flow of the transfer gas and classified.

However, in such a sizing / classifying apparatus and method according to the prior art, there is a problem that the separation efficiency of the fine powder decreases due to the presence of the fine powder (for example, fine powder having a poor dispersion state) that was not accompanied by the transfer gas. Therefore, gas injection nozzles 59 and 60 are provided, and the gas is partially injected in the direction of assisting against the flow of the transfer gas (see Patent Document 1).
JP 2002-254035 A

  However, the classification and classification device and method according to the prior art require gas injection nozzles 59 and 60, a compressed air source such as a compressor, and ancillary equipment such as a control device for controlling these sources, and the compressed air. The increase in running cost for generating is a problem.

  The present invention has been made paying attention to such circumstances, the purpose is to increase the fine powder from the particle mixture after the sizing containing fine powder without increasing incidental equipment and running cost, An object of the present invention is to provide a sizing / sorting device that can be separated efficiently.

  In order to achieve the above-mentioned object, the classification apparatus adopted in claim 1 of the present invention includes a sizing means for sizing the object to be processed including fine powder, and a fine gas immediately after sizing, and a flow of gas. And a classification means having a classification means for circulating a transfer gas with respect to the fine powder to classify and classify the pulverized powder, the multistage louver blades are provided in a generally inclined manner in the transfer gas flow path of the classification means. Thus, the cross-sectional area of the transfer gas is reduced, and the transfer gas passing through the opening between the louver blades is accelerated.

The size classification device employed in claim 2 of the present invention is the size classification device according to claim 1,
The tilt angle of each louver blade has a variable structure, and by controlling the tilt angle, the inertial force of the workpiece sliding down on the louver blade is changed. It is.

  The size classification apparatus employed in claim 3 of the present invention is the size classification apparatus according to claim 1 or 2, wherein each of the louver blades is provided with a horizontal shaft disposed in a substantially horizontal direction. The tilt angle of each louver blade is controlled by rotating a horizontal axis.

  According to a fourth aspect of the present invention, there is provided a classification apparatus according to any one of the first to third aspects, wherein the inclination angle of each louver blade is kept constant. The size of the opening between the louver blades is variable, and by controlling the size of the opening between the louver blades, the cross-sectional area of the transfer gas is changed, and the particles to be entrained in the transfer gas are changed. It is characterized by being configured to control the size.

  The size classification device employed in claim 5 of the present invention is the size classification device according to any one of claims 1 to 4, wherein the louver blade and the transfer gas downstream in the flow direction. The flow path cross-sectional area of the transfer gas in the louver blade downstream space constituted by the classification part side wall is configured to expand along the flow direction of the transfer gas.

  The size classification device adopted by claim 6 of the present invention is the size classification device according to claim 5, wherein the transfer gas / fine powder discharge port is arranged above the space on the downstream side of the louver blade of the transfer gas flow path, In addition, the particle discharge port is disposed below, and the overall inclination angle of the multi-stage louver blade is variable, and the flow of the transfer gas in the louver blade downstream space is controlled by controlling the inclination angle. The flow path cross-sectional area along the direction is changed.

  According to the classification apparatus according to claim 1 of the present invention, the classification means for classifying the object to be processed including fine powder, and the fine powder immediately after the classification is accompanied by the flow of the transfer gas and classified. In the classifying device having a classification means for circulating the transfer gas to the fine powder, the transfer gas passes by providing a multistage louver blade in the transfer gas flow path of the classification means as a whole. Since the cross-sectional area is reduced and the transfer gas passing through the opening between the louver blades is accelerated, particles that have not been entrained by the transfer gas in the dispersed state after sizing (the dispersion state is poor) Fine powder) can be put on the flow of the transfer gas, and the high-speed transfer gas can collide with the particles after sizing a plurality of times by the multi-stage louver blade, so that the separation efficiency of the fine powder can be improved. .

  Further, according to the sizing / classifying apparatus according to claim 2 of the present invention, the louver blade has a structure in which the inclination angle is variable, and by controlling the inclination angle, the object to slide down on the louver wing is controlled. Since the inertial force of the processed product is changed, the fineness of the product obtained (or alternatively, by controlling the particle diameter exceeding the louver blade from the relationship between the inertial force due to the sliding of the particles and the wind speed) The mixing amount of fine powder) can be changed.

  Furthermore, according to the classification apparatus according to claim 3 of the present invention, each of the louver blades is provided with a horizontal shaft disposed in a substantially horizontal direction, and the louver blade is rotated by rotating the horizontal shaft. Since each tilt angle is controlled, the tilt angle of the louver blade can be reliably controlled.

  Furthermore, according to the sizing / classifying apparatus according to claim 4 of the present invention, the louver has a structure in which the opening size between the louver blades is variable while keeping the inclination angle of each louver blade constant. Since the cross sectional area of the transfer gas is changed by controlling the size of the opening between the blades, the size of the particles accompanying the transfer gas is controlled. The fineness of the product obtained (or the amount of fine powder mixed) can be changed. Further, if the tilt angle of each louver blade can be controlled in accordance with the control, fine adjustment when changing is facilitated.

  According to the classification device according to claim 5 of the present invention, the flow passage of the transfer gas in the louver blade downstream space constituted by the louver blade and the classification unit side wall on the downstream side in the flow direction of the transfer gas. Since the area is configured to expand along the flow direction of the transfer gas, particles having a particle size that does not need to be separated can be recovered again from the particles riding on the flow of the accompanying gas. Accurate control is possible.

  According to the classification apparatus according to claim 6 of the present invention, the transfer gas / fine powder discharge port is disposed above the louver blade downstream side space of the transfer gas channel, and the particle discharge port is disposed below, The multi-stage louver blade has a structure in which the overall inclination angle is variable. By controlling the inclination angle, the flow path cross-sectional area along the flow direction of the transfer gas in the downstream space of the louver blade is changed. Thus, the particle diameter discharged from the particle discharge port can be controlled.

  First, the configuration of the sizing / classifying apparatus according to Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a side sectional view showing an outline of a classification device according to Embodiment 1 of the present invention, and FIG. 2 is a schematic diagram schematically showing a classification portion of the classification device according to Embodiment 1 of the present invention. FIG.

  In FIG. 1, the sizing / classifying device 1 according to the present invention includes a sieving portion 2 containing a sizing means for removing coarse particles from an object to be treated, and a sizing means 2 disposed below the sieving portion 2. And a classification portion 3 containing classification means for separating coarse particles, fine particles, and fine particles.

  That is, the sieving portion 2 has a sizing means for dividing an object (raw material) M containing coarse particles, coarse particles, fine particles and fine powder into coarse particles, coarse particles and fine particles / fine powder. As shown, a sieve mesh 4 composed of an upper mesh 4a and a lower mesh 4b having different mesh openings is disposed obliquely downward from a lower portion of an input port 2a for an object M to be described later.

  On the top side (upstream end side) of the sieve part 2 is provided with an inlet 2a for the workpiece M, and on the lower end side (downstream end side) of the sieve mesh 4 arranged obliquely downward, A discharge port 2b for discharging the coarse particles M1 as a net is provided. Further, a vibrator (not shown) is provided to apply vibration to the sieve mesh 4, and the charged workpiece M is vibrated and moved (lowered) on the sieve mesh 4 toward the downstream side. The particles having a particle size smaller than the coarse particles M1, that is, the coarse particles and the fine particles / fine powders are sieved off as the meshwork Ma and divided.

  A transfer gas introduction port 3a for introducing a transfer gas is provided at the lower part of the classification portion 3, and the transfer gas and fine powder are formed on the opposing surface of the classification portion 3 above the transfer gas introduction port 3a. An M4 discharge port (hereinafter referred to as a transfer gas / fine powder discharge port) 3b is provided, and is duct-connected to a suction device such as a suction fan (not shown). In addition, a coarse particle outlet 3c for collecting coarse particles M2 that do not get on the transfer gas 5 is provided at the lower end of the classification portion 3.

  Furthermore, in the classification part 3, the passage cross-sectional area is reduced by providing multistage louver blades 6 so as to partially block the flow 5 of the transfer gas in the flow path space where the flow 5 of the transfer gas is formed. When the transfer gas passes through the slit-like opening 6 a between the louver blades 6, the transfer gas flow 5 a accelerated by the slit-like gap is formed.

  Next, the sizing / classifying action of the sizing / classifying apparatus 1 according to the present invention configured as described above will be described below by following the process. In the above sizing / classifying device 1, the vibration generator 4 is activated to vibrate the sieve screen 4, and the suction device is activated. And the to-be-processed object M containing a coarse grain, a coarse grain, a fine grain, and a fine powder is started continuously from the inlet 2a, and the transfer gas is introduced from the transfer gas inlet 3a by the suction action of the suction device.

  If it does so, the said to-be-processed object 2 will be in the state with which the to-be-processed object M was substantially filled with few entry / exit of air by the continuous input of the to-be-processed object M. Since it is sucked by the suction device in this state, a transfer gas (air) flow 5 is generated as shown in FIG. That is, in the lower part of the sieve screen 4, a transfer gas flow path in an obliquely upward direction from the transfer gas introduction port 3a toward the transfer gas / fine powder discharge port 3b is formed.

  The workpiece M input from the input port 2a is divided into coarse particles M1, coarse particles, fine particles, and fine particles by the sieve screen 4. That is, the coarse particles in the workpiece M are discharged from the coarse particle discharge port 2b through the shooter 7 as a meshed product (sieving over) M1 without passing through the sieve mesh 4. At the same time, the coarse particles, fine particles and fine powder in the treated product M pass through the sieve mesh 4 and are dispersed to become a mesh product Ma. The mesh product Ma is a classification part arranged at the lower part of the sieve means 4. Fall to 3.

  The net object Ma that has fallen in the classification portion 3 is caused to flow in the transfer direction by the flow 5 of the transfer gas formed inside the classification portion 3 and falls onto the multi-stage louver blade 6, and this louver blade 6 Slide down. At this time, the relatively small particles Mb in the meshwork Ma pass along the opening 6a between the louver blades 6 along with the transfer gas and pass through the flow 5a of the transfer gas that has been accelerated. The louver blade 6 upstream space A in the classifying portion 3 moves to the louver blade 6 downstream space B. On the other hand, relatively large particles that have not been accompanied by the transfer gas fall as they are and are recovered as coarse particles M2 from the coarse particle discharge port 3c.

At that time, the maximum particle size moving to the downstream space B of the louver blade 6 is determined by the inertial force when sliding down the louver blade 6 and the flow velocity _{VL of the} transfer gas flowing through the opening 6a between the louver blades 6. Come. However, the flow velocity _VL of the flow 5a of the transfer gas passing through the opening 6a is increased more than the flow velocity in the transfer gas flow path without the louver blade 6 because the passage cross-sectional area is reduced in the opening 6a. Has been.

  Therefore, in the dispersed state after the sizing, the particles that have not been accompanied by the transfer gas flow 5 (fine powder having a poor dispersion state) are put on the accelerated transfer gas flow 5a passing through the opening 6a. In addition, since the multistage louver blade 6 can cause the high-speed transfer gas to collide with the particles after sizing a plurality of times, the separation efficiency of the fine powder M4 can be improved.

  Then, the fine powder M4 in the particles Mb moved to the downstream space B of the louver blade 6 is accompanied by the flow 5 of the transfer gas, and is discharged from the transfer gas / fine powder discharge port 3b together with the transfer gas. On the other hand, the particles that have not been accompanied by the flow 5 of the transfer gas in the space B are recovered as fine particles M3 from the fine particle discharge holes 3d.

  As described above, the multi-stage louver blade 6 is provided in the transfer gas flow path of the classifying means 3 so that the transfer gas passing through the opening 6a between the louver blades 6 is accelerated. The separation efficiency can be improved. In this way, coarse particles M2 and fine particles M3 from which the coarse particles M1 and fine particles M4 have been efficiently eliminated can be obtained from the workpiece M containing coarse particles and fine particles.

Next, a more preferable configuration of the particle classification device 1 according to the present invention configured as described above will be described below with reference to FIG. That is, the louver blades 6 of sizing classifier 1 according to the present invention, horizontal and forms the inclination angle theta _L is a variable structure, by controlling the inclination angle theta _L, slides down on the louver blades 6 It is preferable that the inertial force of the workpiece is changed.

  Such a configuration can be achieved by providing each of the louver blades 6 with a horizontal shaft 6b disposed in a substantially horizontal direction and rotating the horizontal shaft 6b. The opening size δ is an opening size perpendicular to the flow direction of the transfer gas in the opening 6 a formed between the louver blades 6.

  Alternatively, although not shown in the drawings, as a structure in which the louver blades 6 at each stage can be moved in a direction parallel to the direction in which the blades are arranged in a state where the inclination angle of each louver blade 6 at each stage is kept constant, This can also be achieved by making the opening dimension δ between the blades 6 variable and controlling the opening dimension δ between the louver blades 6. For example, a number of louver blade fixing positions are set in parallel to the arrangement direction of the louver blade 6 with respect to the side walls of the classification portion 3 on the left and right ends of the louver blade 6, and the louver blade 6 What is necessary is just to set it as the structure which can change an installation position suitably.

By configuring as described above, the relationship between the flow velocity V _L of the transfer gas in the opening 6a and the drop speed (inertial force) of the particles sliding down the louver blade 6 is controlled, and the flow 5a of the transfer gas is controlled. In other words, the lower limit particle size of the coarse particles M2 can be controlled.

Further, the flow passage cross-sectional area of the downstream space B of the louver blade 6 constituted by the louver blade 6 of the sizing / classifying device 1 according to the present invention and the classification portion side wall 3e on the downstream side in the flow 5 direction of the transfer gas is It is preferable that the flow gas expands in accordance with the five flow directions. Such an arrangement, the horizontal plane formed inclination angle louver blades 6 as a whole theta _L is, the classification unit side wall 3e is an angle exceeding the horizontal plane and forms the inclination angle _{θ 0 (θ L> θ 0} ) is accomplished by The

The transfer gas flow velocity immediately after passing the louver blade 6 in the downstream space B is generally high in flow velocity and tends to be turbulent, and adversely affects fine powder separation efficiency. For this reason, by configuring the flow passage cross-sectional area of the downstream space B of the louver blade 6 to continuously expand along the direction 5 of the flow of the transfer gas, the downstream space B is gradually reduced from Va to Vb. As a result, a stable transfer gas flow 5 is formed at a reduced flow rate. Thus, in the process of decelerating the flow velocity of the transfer gas, the particles to be classified as the fine particles M3 are separated from the transfer gas flow 5 without being accompanied and efficiently separated. .

Furthermore, a transfer gas / fine powder discharge port 3b is disposed above the space on the downstream side of the louver blade 6 of the transfer gas channel, and a coarse particle discharge port 3c and a fine particle discharge port 3d which are particle discharge ports are disposed below. together but are arranged, the overall inclination angle theta _L of the multi-louver blades 6 has a variable structure, by controlling the inclination angle theta _L, the transport gas in the louver blades 6 downstream space It is preferable that the flow path cross-sectional area along the flow 5 direction is changed.

For example, may be configured to change the inclination angle theta _L is swung across louver blades 6 in louver blades 6 upper end around. By making such a configuration, the particle diameter discharged from the transfer gas / fine powder discharge port 3b can be controlled.

Moreover, it is preferable to provide an air supply device (pushing fan or the like) 8 at the transfer gas introduction port 3a. When only the intake air from the transfer gas / fine powder discharge port 3b is used, in order to set the transfer gas flow velocity V _L at the opening 6a between the louver blades 6 to the required speed, the static pressure is large in consideration of the pressure loss of the louver blades 6. An intake device (such as an intake fan) is required, and the driving power increases. However, when air is supplied from the upstream side of the louver blade 6 by the air supply device 8, it is easy to obtain the required flow velocity in the opening 6a without using an air supply device with a large static pressure, and overall efficiency is improved. Because it gets better.

  Next, a sizing / classifying apparatus according to Embodiment 2 of the present invention will be described below with reference to FIG. FIG. 3 is a schematic side cross-sectional view schematically showing the classification means of the particle classification device according to Embodiment 2 of the present invention.

  However, the second embodiment of the present invention differs from the first embodiment in that the arrangement of the louver blades 6 is different, and the other configuration is exactly the same as in the first embodiment. The same reference numerals are given to the same components as those of the first embodiment, and the different points will be described below.

That is, the louver blades 6 of sizing classifier 1 according to the first embodiment is, while being arranged in the same inclined angle theta _L identical opening size and [delta], the second embodiment As shown in FIG. 3, the louver blade 6 of the sizing / classifying apparatus ₁ has different inclination angles θ _{1 to} θ ₅ and different opening sizes δ _{1 to} δ _{4 in} order from the top. The inclination angles θ _{1 to} θ _{5 of the} louver blade 6 and the opening dimensions δ _{1 to} δ ₄ are preferably arranged so as to satisfy the following expressions (1) and (2), respectively.
θ ₁ > θ ₂ > θ ₃ > θ ₄ > θ ₅ (1)
δ ₁ <δ ₂ <δ ₃ <δ ₄ (2)

  In the sizing by the sieving mesh 4 provided in the sizing part 2, particles containing a large amount of fine particles M3 and fine powder M4 pass through the sieving mesh 4 on the upstream side of the sieving mesh 5 in the vicinity of the inlet 2a. There is a tendency that more coarse particles close to the mesh pass as it approaches the downstream side in the vicinity of the product discharge port 2b. On the contrary, the passing amount passing through the sieve screen 4 tends to decrease as it approaches the downstream side in the vicinity of the net outlet port 2b.

On the other hand, by arranging the inclination angles θ _{1 to} θ _{5 of the} louver blade 6 and the opening dimensions δ _{1 to} δ ₄ so as to satisfy the expressions (1) and (2), respectively, the openings transporting the gas flow velocity _V 1 ~V in size δ ₁ ~δ ₄ each ₄ becomes such the following relationship (3).
V ₁ > V ₂ > V ₃ > V ₄ (3)
As a result, the transfer gas flow rate of the portion containing a large amount of the fine powder on the upstream side and having a large amount of passage is increased, and the transfer gas flow velocity of the portion having a small amount of the fine powder on the downstream side and a small amount of passage is reduced. Efficient separation is possible even with air volume.

  In the present invention, the types of treatment objects including coarse particles and fine powders are not particularly limited, and various types can be used. For example, crushed materials obtained by crushing rocks can be used. . In addition, as a to-be-processed object containing a coarse grain and a fine powder, what contains a fine grain, a coarse grain, and a fine powder other than a coarse grain, a fine grain, a coarse grain, and a fine powder, a thing containing a coarse grain, a coarse grain, and a fine powder Etc.

  The fine powder in the present invention is a powder or granule that is small and light enough to be able to ride the flow of the transfer gas. The fine particles are particles that are larger and heavier than the fine powder and are difficult to ride the flow of the transfer gas. Coarse grains are granular bodies larger than the fine powders and fine grains. Coarse grains are grains or rods larger than the fine grains and coarse grains.

  The size of each of these differs depending on the type of object to be processed and the purpose of classification, etc., varies, and is determined. In many cases, the average diameter is 10 mm for coarse particles. As described above, the coarse particles are less than 10 mm, 3 mm or more, the fine particles are less than 3 mm, 0.1 mm or more, and the fine particles are less than 0.1 mm. In the case of a crushed material obtained by crushing rocks in a sandmaking facility, for example, those having an average diameter of about 3 to 5 mm or less are coarse particles, and an average diameter of about 3 to 5 or less is about 0.6 to 1.2 mm. A thing with a coarse grain, a thing with an average diameter of about 0.6-0.075mm or 1.2-0.075mm upper limit, and a thing with an average diameter less than 0.075mm (75 micrometers) may correspond to a fine powder. Many.

  Further, the sieve mesh for classifying the object to be treated including coarse particles, coarse particles, fine particles and fine powders into coarse particles and coarse particles, fine particles and fine powders is the coarse particles in the object to be treated or more. It is a sieve mesh having a mesh size (opening) of a size that allows passage of coarse particles, fine particles, and fine powder without passing a large size. Therefore, the size of the openings of the sieve varies depending on the type of the object to be processed, that is, the size of coarse particles, coarse particles and fine particles, and fine powder.

  In Embodiments 1 and 2 according to the present invention, the description has been given using the example having the sizing means in which the sieve screens having different sieve meshes are arranged in two upper and lower stages and obliquely downward. In the sizing means, The number of stages of the mesh screen and the arrangement in the obliquely downward direction are not particularly limited, and the number of mesh screen stages and the arrangement can be made as necessary. In Embodiments 1 and 2 according to the present invention, the number of stages of the louver blades is described using an example having five stages. However, the number of stages of the louver blades is not particularly limited, and can be increased or decreased as necessary. is there.

  Further, the kind of the transfer gas is not particularly limited, and various types can be used. However, air is usually used unless there is a special circumstance such as a case where a reducing atmosphere is required.

  As described above, according to the sizing / classifying apparatus according to the present invention, the cross section area of the transfer gas is reduced by providing the transfer gas flow path of the classification means with multi-stage louver blades as a whole, and the louver blade Since the transfer gas passing through the opening in between is accelerated, particles that have not been entrained in the transfer gas can be placed in the flow of the transfer gas in the dispersed state after sizing, and the multistage Since the high-speed transport gas can collide with the particles after sizing a plurality of times by the louver blade, the separation efficiency of the fine powder can be improved.

  Further, according to the sizing / classifying apparatus according to the present invention, the louver blade has a variable inclination angle, and the inertial force of the workpiece sliding down on the louver blade is controlled by controlling the inclination angle. By changing, and configured to control the size of the particles accompanying the transfer gas, from the relationship between the inertial force due to the drop of the particles and the wind speed, by controlling the particle diameter beyond the louver blade, The fineness (or the amount of fine powder mixed) of the product obtained can be changed.

It is a sectional side view which shows the outline | summary of the classification apparatus based on Embodiment 1 of this invention. It is the typical sectional side view which showed typically the classification means of the classification apparatus based on Embodiment 1 of this invention. It is the typical sectional side view which showed typically the classification means of the classification apparatus based on Embodiment 2 of this invention. It is a sectional side view which shows the outline | summary of the classification device based on a prior art example.

Explanation of symbols

A: Space on the upstream side of the louver blade in the classification part, B: Space on the downstream side of the louver blade in the classification part M: Material to be treated (raw material),
M1: Coarse grain (net product), M2: Coarse grain, M3: Fine grain, M4: Fine powder,
Ma: Reticulated object, Mb: Particles moving to the space downstream of the louver blade V _L , V _{1 to} V ₄ : Transfer gas flow velocity at the opening between the louver blades θ ₀ : Angle formed by the side wall of the classification portion and the horizontal plane,
θ _L , θ _{1 to} θ ₅ : Inclination angle between louver blades and horizontal plane δ, δ _{1 to} δ ₄ : Opening size between louver blades 1: Size classification device 2: Size division part, 2a: Raw material inlet, 2b: Net object discharge port 3: Classification part, 3a: Transfer gas introduction port, 3b: Transfer gas / fine powder discharge port,
3c: Coarse grain outlet (particle outlet), 3d: Fine grain outlet (particle outlet),
3e: classification part side wall 4: sizing means, 4a: upper net, 4b: lower net 5: flow of transfer gas, 5a: flow of transfer gas increased in speed (change in flow velocity) 6: louver blade, 6a: louver blade Opening 6b: Horizontal shaft 7: Shooter 8: Pushing fan (air supply device)

Claims (6)

  There is a sizing means for sizing the object to be treated containing fine powder, and a classifying means for circulating the transfer gas to the fine powder so that the fine powder immediately after sizing is sent along with the flow of the transfer gas. In the sizing / classifying device, the transfer gas passage of the classification means is provided with a multi-stage louver blade inclined overall, thereby reducing the cross-sectional area of the transfer gas and passing through the opening between the louver blades. A sizing / classifying device configured to increase the speed of a transfer gas.   The tilt angle of each louver blade has a variable structure, and the inertial force of the object sliding down on the louver blade is changed by controlling the tilt angle. Item 2. The size classification apparatus according to Item 1.   The horizontal axis disposed in a substantially horizontal direction is provided in each of the louver blades, and the inclination angle of each louver blade is controlled by rotating the horizontal shaft. The size classification apparatus according to 1 or 2.   The opening size between the louver blades is variable while keeping the inclination angle of each louver blade constant. By controlling the size of the opening between the louver blades, the cross sectional area of the transfer gas can be reduced. The size classification device according to any one of claims 1 to 3, wherein the size classification device is configured to change and control the size of the particles accompanying the transfer gas.   A configuration in which a cross-sectional area of the flow path of the transfer gas in the louver blade downstream space configured by the louver blade and the classification unit side wall on the downstream side in the flow direction of the transfer gas expands along the flow direction of the transfer gas. The sizing / classifying apparatus according to any one of claims 1 to 4, wherein the sizing / classifying apparatus is performed. A structure in which the transfer gas / fine powder discharge port is arranged above the space on the downstream side of the louver blade of the transfer gas flow path and the particle discharge port is arranged below, and the overall inclination angle of the multistage louver blade is variable. The flow path cross-sectional area along the flow direction of the transfer gas in the louver blade downstream space is changed by controlling the inclination angle. Grain classification device.

Images