JPS635821Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a classifier that is integrated with a dust collecting device to simplify the device configuration.

The present applicant has previously improved the conventional classifier with a flat structure by forming the classification screen into a cylindrical shape, and has improved the classification screen with advantages such as increasing its strength, rigidity, and effective passing area. proposed a machine (Special Application No. 37615, 1983). However, such a classifier is configured so that a device for collecting fine particles is installed outside the classifier, and therefore each process such as a classifier, cyclone, bag filter, etc. is installed separately, and each process is In addition to requiring a large amount of money to install the pipes and equipment between the two, there are also problems in that a large amount of power is required to supply the air for transporting the particles.

The inventor of the present invention has devised the present invention in view of the above-mentioned problems with the classifier and to effectively solve the problems.

The object of the present invention is to provide a classifier that is equipped with a cylindrical classifying screen and that classifies particulate material raw material supplied into the casing by the classifying screen into coarse particles and fine particles. A classification device is integrated with a dust collector installed inside, which simplifies the device configuration, reduces device contamination, facilitates device maintenance, reduces pressure loss, and prevents damage and wear of the device. The aim is to provide the opportunity.

Therefore, in the present invention, a partition wall is provided inside the casing to create a double structure between the inside and outside, one of the inner and outer chambers is used as a classification chamber, the other is used as a dust collection chamber, and both chambers are communicated through the bottom of the partition. It is characterized by being made to urge.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

Figure 1 is a longitudinal sectional view of the classifier according to the present invention, Figure 2
Figure 3 is a sectional view taken along line 3-3 in Figure 1, Figure 4 is a sectional view taken along line 4-4 in Figure 1, and Figure 5 is a sectional view taken along line 5-5 in Figure 1. , FIG. 6 is a half-cut sectional view taken in the direction of arrow 6 in FIG. 1.

In FIG. 1, reference numeral 1 denotes a casing, which is formed into an inner and outer double structure by a vertically installed partition wall 2. It is integrally molded from a steel plate or the like into a tube shape with an upper half cylindrical and a lower half conical. A disk-shaped lid 4 is joined to the upper part of the partition wall 2, and inside the partition wall 5 and 6, a raw material input chamber 7, a classification chamber 8, and a coarse particle chamber 9 are provided from above. In addition, a raw material input port 10 is formed in the upper part of the casing 1, that is, in the center of the lid 4, so as to communicate with the raw material input chamber 7 and open upwardly. It is surrounded by the lower member 2b of the partition wall 2 in a skirt shape so as to form an annular passage 13 communicating the classification chamber 8 and the fine particle chamber 12 at its periphery, and a coarse particle chamber 9 is provided at the lower end of the inverted conical portion 11. A coarse particle discharge port 11a is formed which communicates with and opens downward to the outside.

The cross-sectional shapes of the casing 1 and the partition wall 2 are preferably circular in terms of strength, but may be rectangular or polygonal in view of the arrangement of the device.

In the figure, reference numeral 14 denotes a conical raw material distributor installed in the raw material input chamber 7 facing the raw material input port 10, and this is for evenly distributing the input raw materials and guiding them to the classification screen as described later. It is.

Inside the partition wall 2, a plurality of cylindrical classification screens 15 are vertically installed in a circular shape passing through the partition walls 5 and 6.
The passage of the classification screen 15 through the partition walls 5, 6 is made airtight and rotatable by means of seal mechanisms 16, 16, such as oil seals, provided at these portions. The classification screen 15 is made up of a cylindrical upper screen fixing body 17 and a lower screen fixing body 18, and a screen 19 made of wire mesh, cloth, etc. of a predetermined mesh is placed around and fixed with bands 20, 20. The upper screen fixing body 17 and the lower screen fixing body 18 are connected by a hollow cylindrical connecting rod 21 with a smaller diameter than these, and the upper screen fixing body 17 is integrally molded with this 21, and the lower screen fixing body The body 18 is fixed to this 21 by ribs 22, as shown in FIG. In addition, a plurality of raw material supply ports 17a are formed in the protrusion of the classification screen 15 into the raw material input chamber 7, that is, in the upper circumferential wall of the upper screen fixing body 17, and the raw material feed ports 17a are used for classification. The inside of the screen 15 and the raw material input chamber 7 are in communication with each other. On the other hand, the lower end of the classification screen 15 is open to the coarse particle chamber 9 and forms a coarse particle outlet 18a, which includes the outlet 18a and the raw material supply port 17a...
The inside of the coarse particle chamber 9 and the classification screen 15 and the raw material input chamber 7 communicate with each other through... Further, the raw material input chamber 7, the inside of the classification screen 19, and the particulate chamber 12 are in communication with each other via the screen 19 and the passage 13.

Hollow part 21 of connecting rod 21 of classification screen 15
At the top a, there is a drive device 2 installed vertically on the lid 4.
3, a drive shaft 24 extending downward through the lid body 4.
The lower end of the classification screen 15 is penetrated, and the classification screen 15 is configured to be rotationally driven by a drive device 23.

The drive device 23 includes the drive shaft 24 and the shaft 24.
A pair of upper and lower bearings 25, 25 that rotatably support the
and a cylindrical housing 26 that supports the bearings 25, 25 and is fixedly installed on the lid 4. An interlocking drive wheel 27 such as a sprocket is fitted to the upper end of the drive shaft 24, and its passage through the lid 4 is made airtight by a sealing mechanism 28 such as an oil seal. In the figure, 29 is a sleeve for positioning the bearings 25, 25 fitted around the outer periphery of the drive shaft 24, and 30 is a nut for fixing the bearings 25, 25 to the drive shaft 24.

The driving devices 23 are provided in the same number as the classification screens 15, and each device 23 is configured to be interlocked with each other by a chain 31 stretched between respective driving wheels 27, as shown in FIG. An idler 32 is provided between the drive wheels for the purpose of applying appropriate tension to the chain 31. Drive device 23
At the upper end of the drive wheel 27 in any one of the drive wheels 3, the drive wheel 3 is connected to a drive device such as a motor (not shown).
3 is attached.

Screen 19 of classification screen 15...
Air purge pipes 34... are arranged in the center of the classification chamber 8 parallel to and close to the axial direction of the coarse particle chamber 9.
Each air purge pipe 3
4 is closed at its upper and lower ends, and has a slit 3 in the axial direction of the side facing the screen 19 as shown in FIG.
4a is formed, and the other end of the base pipe 35 is connected to a compressed air supply source such as a compressor (not shown).

The annular space between the outer case 3 and the partition wall 2, which is the inner case, is formed into a ring shape to form a ring-shaped duct 36 in the upper part thereof, or is partially cut out except for the location where the instrument panel 37 is disposed, as shown in FIG. A partition wall 38 is provided in a ring shape, and holes 38a are formed at predetermined intervals in the partition wall 38, each having a cylindrical member 38a-1 having a flange on the lower side.
Each of the filters 1 is configured to have a bag filter 39 suspended around the partition wall 2 by a flange. The lower part of the annular space is open and communicates with the particle chamber 12, and passages 40 extending downward are formed at appropriate locations in the ring-shaped duct 36, and are further communicated with the outside through an exhaust port 41. , air inside the casing 1 is sucked through the exhaust port 41. Further, at the lower end of the particulate chamber 12, there is a particulate discharge port 12 that opens downward and communicates with the outside.
a is formed.

Next, to outline the classification process based on FIG. 7, a predetermined amount of the granular raw material to be classified is transferred from a raw material hopper (not shown) through a rotary valve 43 and a raw material input port 10 by the suction force of a blower 42. is sucked into the classifier 1, the raw material is classified into coarse particles and fine particles through a classification process as described below, and the fine particles and air are separated.The coarse particles are passed through the rotary valve 44 from the coarse particle outlet 11a. On the other hand, particulates are collected from the particulate discharge port 12a through the rotary valve 45, and air is sucked into the blower 42 from the side through the exhaust port 41 and flows out. Reference numeral 46 in FIG. 7 is a blower for sending pulsed cleaning air through the base pipe 35 and air purge pipe 34 to clean the clogging of the classification screen 15.

The operation of the classifier according to the present invention will be explained below based on FIG.

The raw material inputted from the raw material input port 10 is evenly distributed by the raw material distributor 14, and then transferred to the raw material supply port 17.
Coarse particles that cannot pass through the screen 19 fall into the coarse particle chamber 9 by their own weight, and are discharged as coarse particles from the coarse particle outlet 11a. The fine particles that are collected and can pass through the screen 9 flow out of the classification screen 15 together with air, and are passed through the passage 13 formed at the lower part of the partition wall 2 at the lower part of the classification chamber 8 based on the suction force of the blower 42. It flows out into the particle chamber 12. Most of the particles that have passed through the passage 13 are sent downward within the particle chamber 12 based on their inertial action, and are sent out and collected by the particle outlet 12a, while the air is sucked by the blower 42. Therefore, after exiting the passage 13, it faces upward and is filtered by the bag filter 39, passes through the hole 38a, and enters the ring duct 36.
It flows out through the exhaust port 41 to the outside. In the above process, some of the particulates are sent upward against the inertial action as the air flows, but the air and the particulates are completely separated by the bag filter 39, which is a dust collector. In this way, the classification chamber and the dust collection chamber are provided within the casing 1, and the classifier and dust collection device are combined together, thereby simplifying the overall device configuration. Further, particles having a particle size approximately equal to the mesh size of the screen 19 or the bag filter 39 clog the mesh, causing clogging. However, in this classifier, each classification screen 1
5 is rotated and the compressed air ejected from the slit 34a of the air purge pipe 34 is injected onto the screen 19 of the screen 19, and the bag filter 39 is cleaned by the usual air pulse method, so that the clogged particles are effectively scattered and removed. The processing capacity of the classifier will not be reduced. Further, a scraper 47 is disposed on the partition wall 6 near the outside of the lower screen fixing body 18, and the scraper 47 scrapes the lower screen fixing body on the partition wall 6.
The fine particles remaining around 8 are classified by screen 15.
Scrape it off as it rotates.

Next, the structure for cleaning the classification screen will be explained based on FIGS. 1, 5, and 6. It is attached to the outer case 3 of the casing 1 with hinge members 48, 48 and can be opened and closed. Two opening/closing members 3a are provided on both sides, and gaskets 49 are interposed at the contact portions between the opening/closing members 3a and other casing parts in the closed state. Similarly, in the partition wall 2 forming the inner cylinder, opening/closing members 2a that are attached by hinge members (not shown) and can be opened and closed are provided at two locations on both sides, and gaskets 50 are provided at the abutting portions in the closed state. ... will be intervened. According to this, by opening the opening/closing members 3a, 3a in a timely manner, the bag filter 39... can be cleaned, and by opening the opening/closing members 2a, 2a, the classification screen 15..., etc. can be cleaned. be able to.

FIG. 8 is a longitudinal cross-sectional view of a classifier showing another embodiment of the present invention. In this embodiment, the inner cylinder part of the casing 101 has a double structure inside and outside with a cylindrical partition wall 102, and a classification screen is provided around the outside of the partition wall 102. 103... and the casing 10 inside the partition wall 102.
One bug filter 104 is disposed in the center of the filter. The exhaust duct 105 connected to the upper end of the bag filter 104 passes through the upper partition wall 106, the raw material input chamber 107, and the raw material input port 108, and is led out to the outside.
The raw material distributor 109 facing 08 is the exhaust duct 10
Formed around 5. Also, classification screen 10
3, one bearing 110 is provided inside the drive device and the other bearing 111 is provided in the partition wall 112, and
Air purge pipes 113 are provided through the side wall of the cylindrical portion of the casing 101 in correspondence with the respective classification screens 103. Casing 1
The lower part of 01 becomes a coarse particle chamber 114, while the lower partition wall 112 is connected to the classification chamber and has the above-mentioned cylindrical partition wall 10.
A particulate chamber 115 is provided in which the lower end opening of No. 2 and the opening thereof face each other. This embodiment has the advantage that only one back filter 104 is required.

9 to 13 show embodiments in which the present invention is applied to classifiers having various configurations that produce relative movement between the classification screen and the air purge tube.

In FIG. 9, a classification screen 201... is fixedly installed inside a partition wall 203 in a casing 202, and the partition wall 203
A raw material supply port 204 communicating with the inside is formed in the lid body 205, a coarse particle discharge passage 207 is provided in the lower partition wall 206, and a bag filter 2 is provided around the partition wall 203.
08... are arranged, and a particle chamber 209 is formed in the lower part of the casing 202. Inside each classification screen 201, a ring-shaped air purge pipe 210 as shown in FIG. 211 is connected to a vertical drive device 212 and a compressed air supply source (not shown). Further, a slit serving as an ejection port is formed on the outer peripheral side of the air purge pipe 210. According to the above, the particles passing through the classification screen 201 are discharged to the outside through the particle chamber 209 due to its penetrating action, and the air is sucked and discharged to the outside through the bag filter 208. Classification screen 2
The cleaning of No. 01 is performed by blowing out compressed air from an air purge pipe 210 that moves up and down within the classification screen by a drive device 212, thereby eliminating clogging.

FIG. 11 shows a rotating classification screen 302 disposed inside a cylindrical partition wall 301, and a connecting rod 3.
03 with a rotary joint 304, and a bag filter 305 is installed around the partition wall 301.
...... will be installed. A slit serving as a compressed air outlet is formed in the axial side of the connecting rod 303, and if compressed air is blown out from the slit while rotating the classification screen 302, the screen 30
6. Clogging can be prevented.

In FIG. 12, classification screens 401 are fixedly installed in a cylindrical internal partition wall 402, and a ring-shaped air purge pipe 403 as shown in FIG. An example is shown in which the air purge pipes 403 are commonly connected to a single pipe 405 connected to a drive device 404 and a compressed air supply source (not shown) to be movable. A plurality of bag filters 406 are arranged around the outer periphery of the partition wall 402. Note that a slit serving as a compressed air outlet is formed on the inner peripheral side of the air purge pipe 403.

FIG. 14 is a cross-sectional view of an air purge tube showing an example of the shape of the opposing portion of a rectangular cylindrical air purge tube 502 disposed opposite to the classification screen 501. In this example, the slit 502a is Guide plates 503, 503 along the outer peripheral surface of the classification screen 501 in the vertical direction on both sides of the formed opposing surfaces.
This prevents the purge air from escaping.

As is clear from the above explanation, according to the present invention,
A bag filter as a dust collector is integrated into the classifier, which is equipped with a cylindrical classification screen with high strength and rigidity, and various types of screen cleaning devices, which reduces the number of connecting ducts and simplifies the overall device configuration. The manufacturing cost can be reduced, the device is small and compact, the equipment is less contaminated and maintenance is easy, and the pressure loss of compressed air is also reduced. Furthermore, since the inertial action based on the movement of the particles themselves is mainly used to separate the classified particles from the air, the collection of the particles is reliable and the collection efficiency is extremely high. Furthermore, since each particle does not need to pass through a duct, cyclone, etc. after classification, it does not come into forced sliding contact with the device, and it is possible to prevent damage and abrasion of the device due to the particles, as well as damage to the particles themselves.

In addition, parts of the external and internal casings of the classifier can be opened and closed to make it easier to clean the inside of the classifier, and a guide plate is provided on the surface of the air purge tube facing the screen. This reduces the escape of purge air as much as possible and improves the effectiveness of preventing clogging.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a classifier according to the present invention, and FIG. 2 is a section 2 in FIG.
Direction arrow view, Figure 3 is a sectional view taken along line 3-3 in Figure 1,
Figure 4 is a sectional view taken along the line 4-4 in Figure 1, and Figure 5 is a cross-sectional view taken along the line 4-4 in Figure 1.
5-5 line sectional view in the figure, Figure 6 is a partial vertical cross-sectional view taken in the direction of arrow 6 in Figure 1, Figure 7 is a system diagram of the entire classifier device, and Figure 8 is related to the first modified example. FIG. 9 is a vertical cross-sectional view of the classifier according to the second modified embodiment, FIG. 10 is a plan view of the air purge pipe in FIG. 9, and FIG. 11 is a vertical cross-sectional view of the classifier according to the second modified embodiment. FIG. 12 is a longitudinal sectional view of the classifier according to the fourth modified example, FIG. 13 is a plan view of the air purge pipe, and FIG. 14 is the structure of the part of the air purge pipe facing the screen. FIG. In addition, in the drawing, 1,101,202 is a classification casing, 2,102, 203, 301, 402 is a partition wall, 3 is an outer case, 7,107 is a raw material input chamber,
8 is a classification room, 9,114 is a coarse particle room, 12, 11
5,209 is a particle chamber, 13 is a passage, 15,10
3,201,302,401,501 are classification screens, 34,113,210,403,502
is air purge pipe, 39,104,208,30
5,406 is a bug filter, 41 is an exhaust port, 4
2 is a raw material supply blower, and 46 is a cleaning blower.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Particulate material raw material supplied by suction force etc. to a classification chamber in a casing is classified into coarse particles and fine particles by a cylindrical classification screen installed in the classification chamber. , a classifier that causes coarse particles to fall under their own weight into a coarse particle chamber provided below the classification screen, and sends fine particles out of the classification screen together with air, a cylindrical partition being provided within the casing; One of the inner and outer chambers formed by the partition wall is used as the classification chamber, the other is used as the dust collection chamber, and an opening for an air purge pipe is provided in the classification chamber so as to face the outer surface of the cylindrical classification screen. The air purge pipe is connected to a compressed air supply source outside the casing so that compressed air is injected from the opening onto the classification screen, and the fine particles sent out outside the classification screen are separated by their own weight. A dust collection device that includes a particulate chamber below the dust collecting chamber that collects particles by inertial action based on the suction force, etc., and separates air from particulates that are not collected in the particulate chamber and move due to the suction force, etc. is provided in the dust collection chamber. (2) The classifier according to claim 1 of the above-mentioned utility model registration claim, characterized in that an opening/closing member is provided in each part of the inner case and the outer case formed in the casing by the partition wall. .