JP2002186908A - Sieving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sieving device that can effectively solve clogging of a sieving net while it performs sieving of raw materials continuously. SOLUTION: A sieving space 11 which is formed in a device housing 10 is divided into an upper space of the sieving device 16 and a lower space of the sieving device 17. On a cover 20 that closes the upper face of the upper space of the sieving device 16, a material injection port 23 is provided thereon, while under this material injection port 23, a material dispersion plate 25 is provided. To the lower space of the sieving device 17, a product outlet port 30 is installed and a suction duct 8 is connected thereto. Similarly, in the lower space of the sieving device 17, a nozzle 33 is positioned which blows air up to a sieving net 15 while it is rotating under the sieving net 15. In one side of the upper space of the sieving device 16, a remaining particle exhaust port 40 is provided. To this port, a door 40 is provided so that an open/close condition can be selected. Meanwhile, to the remaining particle exhaust port 40, a height variable gate plate 46 is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sieving apparatus for sieving solids.

[0002]

2. Description of the Related Art A sieve mesh is generally used for sieving solids. In a usual sieve, a mechanism is adopted in which the raw material particles are forcibly moved by vibrating a sieve mesh, and the accelerated raw material particles pass through the sieve. As a result, sieving is efficiently performed, but on the other hand, the phenomenon that large particles are forcibly pushed into the sieve and clogged due to the forced kinetic force applied to the raw material particles is likely to occur . Therefore, in the case where the sieving operation is performed continuously, it is necessary to periodically or constantly clean the sieve net to prevent the progress of clogging. Brushes are often used to eliminate clogging, but other methods have been developed. For example, Japanese Patent Application Laid-Open No. 2000-135474 discloses a sieve device having a configuration in which air is blown up from below the sieve mesh and the material remaining on the sieve mesh is discharged. However, this sieve device needs to introduce a large amount of compressed air in order to blow up the entire area of the sieve net simultaneously. In addition, local pressure is weakened by the air being dispersed throughout the sieve mesh,
It cannot be said that it is sufficiently effective to eliminate clogging.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sieving apparatus which introduces a new sieving principle and can effectively eliminate clogging of a sieving net while continuously sieving raw materials. With the goal. It is another object of the present invention to provide a sieve device capable of effectively removing residual particles that have not passed through a sieve mesh.

[0004]

According to the present invention, the sieve device is provided with the following configuration. a. A sieve net that divides the sieve space into an upper sieve space and a lower sieve space b. A raw material inlet formed in a lid for closing the upper surface of the above sieve space; c. A product outlet provided in the space under the sieve; d. A nozzle that blows air toward the screen while rotating below the screen.

[0005] As described above, the sieve space is divided into an upper sieve space and a lower sieve space by a sieve mesh, a raw material inlet is formed in a lid for closing the upper surface of the upper sieve space, and a product outlet is provided in the lower sieve space. And a nozzle that blows air toward the sieve mesh while rotating under the sieve mesh, so that the air blown up from the nozzle passes through the sieve mesh from below, and then makes a U-turn to form the sieve mesh. There is an air flow that goes down from the top and goes to the product outlet. The raw material particles introduced from the raw material input port onto the sieve mesh are those that pass through the sieve mesh on the airflow that passes down from above the sieve mesh,
Since the kinetic force of the type that vibrates the sieve mesh is not given to the raw material particles, a situation in which the particles are firmly clogged in the sieve and cannot be removed does not occur much. That is, since the clogging is such that it is easily removed by an air current that blows the sieve mesh upward from the bottom, clogging of the sieve mesh can be eliminated simultaneously while continuously feeding the raw material particles. In addition, since the nozzle blows air locally, the clogging elimination power is large.

In the present invention, a raw material dispersion plate is disposed below the raw material inlet. As a result, the raw material particles are dispersed over a wide range and fall without being concentrated at one location of the sieve mesh, so that the sieving operation can be efficiently performed using the sieve mesh widely.

In the present invention, a suction duct is connected to the product outlet. As a result, the product can be quickly taken out and the continuous sieving operation can proceed smoothly.

In the present invention, a scraper for scraping out the product is provided in the nozzle. As a result, a product that has fallen to a location far from the product outlet can be taken out without being retained at that location.

In the present invention, a residual particle discharge port for discharging residual particles that have not passed through the sieve mesh among the raw materials is provided on one side of the space above the sieve. This can prevent a situation in which the residual particles obstruct the sieving operation by blocking the sieve net.

In the present invention, a door capable of selecting between a closed state and an open state is provided at the residual particle discharge port. This allows
At the stage where the amount of residual particles is small and does not hinder the sieving operation, the residual particle discharge port is closed to prevent fine powder as a product from leaking from here, and the amount of residual particles increases and hinders the sieving operation When the discharge starts, the residual particle discharge port is opened, and the residual particles are discharged at a time.

In the present invention, a gate plate having a variable height is provided at the residual particle discharge port. This makes it possible to adjust the ease of passage of the residual particle outlet, so that only the residual particles having a large mass and thus a large inertia of inertia jump over the gate plate. It is possible to make adjustments such as passing through a sieve screen while stopping.

[0012]

FIG. 3 shows a schematic configuration of a sieving system incorporating a sieving apparatus 1 of the present invention. The sieving apparatus 1 is installed on a base 2 having a height of a desk. Further, a raw material feeder 3 for supplying a raw material to the sieve device 1 is provided on the base 2. A product collection tower 4 is installed on the floor next to the base 2. An electric suction blower 5 is installed at the top of the product collection tower 4, and a product collection pail 6 is connected to the bottom of the tower. The electric suction blower 5 passes through a bag filter 7 disposed on the ceiling of the product collection tower 4,
Suction duct 8 connecting sieving device 1 and product collection tower 4
Apply suction force to

When the electric suction blower 5 is driven, the product is sucked from the sieving apparatus 1 to the product collection tower 4 through the suction duct 8 together with air. The “product” refers to fine particles that have passed through a sieve net among the raw material particles. Some of the products that have entered the product recovery tower 4 immediately fall into the product recovery pail 6, and some of them soar with the airflow and are filtered by the bag filter 7. The product adhering to the outer surface of the bag filter 7 is separated from the bag filter 7 by performing backwashing of the bag filter 7 at a predetermined timing, and falls into the product recovery pail 6. After the sieving operation is completed, the product collection pail 6 is removed from the product collection tower 4 and transported to a place where the product is used or a product packing work place.

FIG. 1 shows a first embodiment of a sieve apparatus 1 of the present invention. In the figure, reference numeral 10 denotes an apparatus housing,
A sieve space 11 is formed in the upper part. The sieve space 11 is a cylindrical space having an open upper surface, and the inner peripheral surface thereof has:
A shoulder 12 is formed at an intermediate height. 13
Is a sieve net unit consisting of a ring 14 and a sieve net 15 stretched inside the ring. The outer diameter of the ring 14 is slightly smaller than the inner diameter of the sieve space 11, so that the ring 14 is
Can be inserted from above. The shoulder 12 is the insertion limit of the ring 14. At insertion limit, ring 1
The lower edge of 4 is in close contact with the upper surface of the shoulder 12, and the sieve mesh 15 partitions the sieve space 11 into an upper sieve space 16 and a lower sieve space 17.

The upper surface of the sieve space 16 is closed by a lid 20. The lid 20 fits inside the ring 14, and a horizontal annular rib 21 for receiving the peripheral edge of the lid 20 is formed on the inner surface of the ring 14 at a position higher than the screen 15. A knob portion 22 is integrally formed at the center of the lid 20, and a material input port 23 penetrates vertically through the center.
A funnel 24 is inserted into the raw material inlet 23 from above.
Reference numeral 25 denotes a raw material dispersing plate disposed immediately below the raw material input port 23, which is formed in a substantially conical cross-sectional shape in which the center is high and becomes lower as the distance from the center increases. Several stays 26 suspend and support the raw material dispersion plate 25 on the lower surface of the lid 20, and the raw material dispersion plate 25 is held at a position slightly below the outlet of the raw material inlet 23.

A product outlet 30 is formed on one side of the under-sieve space 17, and the suction duct 8 is connected to the product outlet 30. A bearing portion 32 is provided at the center of a bottom plate 31 serving as a bottom portion of the under-sieving space 17, and a nozzle 33 is rotatably held around a vertical axis. The nozzle 33 is arranged so as to be parallel to the hollow shaft portion 34 at a small distance from the sieve net 15.
A hollow arm 35 extending horizontally from the upper end of the
And The radius of the arm 35 is slightly smaller than the inner radius of the under-sieving space 17. A slit-shaped outlet 36 extending in the radial direction is formed on the upper surface of the arm 35. The outlet 36 covers from the center of the shaft 34 to near the tip of the arm 35. An outward outlet 37 is also formed at the tip of the arm 35.

A scraper 38 for scraping out a product is fixed to the lower surface of the arm portion 34. The scraper 38 is a plate-shaped part made of a material having elasticity such as synthetic resin or rubber, and is formed so that its edge faces the inner peripheral surface and the bottom surface of the space under the sieve with a small gap.

Next, the operation of the sieving apparatus 1 will be described. A sieve mesh unit 13 having a mesh sieve 15 according to the purpose of operation is selected and set in the sieve space 11. Then cover 20
Is set. When the raw material particles are charged into the funnel 24 of the raw material input port 23 while performing suction from the suction duct 8, the raw material particles are dispersed in all directions by the raw material dispersion plate 25, and the sieve mesh 1 is formed.
Fall on 5 Of the raw material particles, fine particles to be a product pass through the eyes of the sieve screen 15 and fall into the under-sieving space 17. The product that has fallen into the under-sieving space 17 enters the suction duct 8 from the product outlet 30 together with air, and is carried to the product collection tower 4.

During the sieving operation, the nozzle 33 receives power from a power source (not shown) and continues to rotate slowly under the sieve mesh 15 to rotate the arm 35 in a horizontal plane.
Air is sent to the nozzle 33 through a shaft portion 34, and the air turns into the arm portion 35 and blows upward from a blowout port 36 and blows out horizontally from a blowout port 37. The air from the outlet 36 blows the sieve 15 upward from below, and blows off objects caught in the eyes of the sieve 15. Thereby, clogging of the sieve screen 15 is eliminated. The air blown out from the outlet 37 blows off the product adhered or retained on the wall surface or the corner of the under-sieving space 17.

The air that has passed through the screen 15 from above to below is
When the nozzle 33 makes a U-turn while hitting the lower surface, the nozzle 33 passes through the sieve 15 from above to below where air is not blown up.
The fine particles in the raw material particles pass through the sieve through the downward airflow. Since the motive force given to the raw material particles by the air current is not so large, the large particles in the raw material particles do not become firmly clogged in the sieve. Any trapped particles are easily removed by the air blown up by the nozzle 33.

The scraper 38 pushes the product at its front surface, and scrapes the product toward the suction duct 8 at the product outlet 30. The scraper 38 is formed of an elastic material such as synthetic resin or rubber as described above, and does not damage the inner wall even if the inner wall of the space 17 under the sieve is rubbed. Further, even if the product hardens and hinders the movement of the scraper 38, the scraper 38 warps and overcomes the obstacle.
There is no damage to the drive mechanism.

FIG. 4 shows a second embodiment of the sieving apparatus 1 of the present invention. In the following embodiments including the second embodiment, the same reference numerals as those used in the first embodiment denote the same components as those in the first embodiment, and a description thereof will be omitted. In the second embodiment, a residual particle discharge port 40 for discharging the residual particles that have not passed through the sieve screen 15 among the raw material particles charged into the sieve upper space 16 is provided on one side of the upper sieve space 16. I have. The residual particle discharge port 40 is constituted by an opening 41 formed in the ring 14 of the sieve mesh unit 13 and an opening 42 formed in the apparatus housing 10.

Reference numeral 43 denotes a residual particle container connected to the opening 42. The residual particle container 43 is detachably attached to the apparatus housing 10 by clamping means (not shown). 44 is a door disposed inside the opening 42,
Takes the role of opening and closing. The door 44 pivots about a support shaft 45 at the upper end in a vertical plane, and takes two states: a closed state shown by a broken line in the figure and an open state shown by a solid line. Door 4
For rotating the 4 and maintaining it in either the closed state or the open state, a well-known actuator element such as an air cylinder, a solenoid, or an electric motor can be used. Or open and close manually, suitable holding means,
For example, the closed state or the open state may be maintained by a latch, a magnet, a weight, a toggle spring, or the like.

When the door 44 is opened and sieving is performed,
Residual particles that do not pass through the sieve mesh 15 are subjected to micro-vibration transmitted to the sieve mesh 15 by an electric motor rotating the nozzle 33, and air blown up from the nozzle 33 passes through the sieve mesh 15 from bottom to top, and this air makes a U-turn. This time, it moves on the sieve 15 due to the flow of air, such as passing through the sieve 15 from top to bottom,
The particles fall from the residual particle outlet 40 into the residual particle container 43.
Thereby, a factor that blocks the screen of the sieve screen 15 is eliminated.
When the amount of residual particles in the residual particle container 43 increases, the door 44 is closed, the residual particle container 43 is removed, and the contents are discarded. Thereafter, the residual particle container 43 is attached again, and the door 4
Open 4 to resume receiving residual particles.

When the door 44 is opened, even the fine particles to be a product leak to the residual particle container 43. In order to reduce the leakage of the fine particles, the amount of the residual particles is small, and at a stage where the sieving operation is not hindered, the residual particle discharge port 40 is closed to prevent the leakage of the fine particles. It is also a measure to open the residual particle discharge port 40 and discharge the residual particles at once if the operation starts to be troubled.

FIG. 5 shows a third embodiment of the sieving apparatus 1 of the present invention. The structure in which the residual particle discharge port 40 is provided is the same as that of the second embodiment. However, in the third embodiment, a variable height gate plate 46 is added to the residual particle discharge port 40. Specifically, a vertical groove 47 is formed in the lower edge of the opening 42, and the gate plate 46 is inserted into the groove 47 from above. The device housing 10 has a required portion in a divided structure so that the gate plate 46 can be inserted into the groove 47. The gate plate 46 inserted into the groove 47 is fixed when the upper edge is at an appropriate height by screws 48 screwed into the device housing 10.
The door 44 contacts the rear surface of the gate plate 46. As shown in FIG. 6, the gate plate 46 is connected to the ring 14 of the screen unit 13.
Are curved in a horizontal plane along the curvature of the outer surface of. Door 44
Are also curved so as to be in close contact with the gate plate 46.

When the door 44 is opened and sieving is performed,
As in the case of the second embodiment, the residual particles that do not pass through the sieve screen 15 dance up on the sieve screen 15 due to the micro-vibration transmitted to the sieve screen 15 and the flow of the air passing through the sieve screen 15, and the residual particles It enters the residual particle container 43 from the outlet 40.
In this case, the gate plate 4 at the residual particle discharge port 40 is used.
6 is a barrier, and only an object having kinetic energy enough to jump over the upper edge of the gate plate 46 can move toward the residual particle container 43. Therefore, only the residual particles having a large mass pass through the gate plate 46, and the fine particles having a small mass remain inside the on-screen space 16, so that the leakage of the fine particles can be suppressed. In order to further ensure this effect, a closed structure other than the portion where the residual particle container 43 is joined to the opening 42 should be a closed structure so that an airflow flowing from the sieve upper space 16 toward the residual particle container 43 does not occur. good. The height of the upper edge of the gate plate 46 is appropriately determined by experiments.

Although the embodiments of the present invention have been described above, various modifications can be made without departing from the gist of the present invention. For example, a configuration in which only one arm 35 of the nozzle 33 protrudes from the shaft 34 in a cantilever manner has been introduced.
It is also possible to adopt a configuration in which more than one book projects radially.

[0029]

The sieve device of the present invention has the following effects. The sieve space is divided into an upper sieve space and a lower sieve space by a sieve net, and a material inlet is formed in a lid for closing an upper surface of the upper sieve space. While rotating at, arranged a nozzle that blows air toward the sieve mesh, after the air blown up from the nozzle passes through the sieve mesh from bottom to top,
A U-turn causes the airflow to pass through the sieve mesh from the top to the bottom, and then to the product outlet, and the raw material particles introduced into the sieve mesh from the raw material input port ride on the airflow from the top to the bottom to form a sieve. pass. The kinetic force applied to the raw material particles by the airflow is not as large as the kinetic force applied to the raw material particles by the sieving machine of the type that vibrates the sieve mesh. Not much. That is, the clogging is such that it is easily removed by an air current that blows the sieve mesh upward from below, and the clogging of the sieve mesh is simultaneously eliminated while continuously feeding the raw material particles from the raw material inlet. be able to. In addition, since the nozzle blows air locally, the clogging elimination power is large.

Since the raw material dispersing plate is arranged below the raw material inlet, the raw material particles do not concentrate on one place of the sieve mesh, but are dispersed and fall over a wide range, and the sieve is widely used to efficiently sieve. Can perform the division work.

[00031] Since the suction duct is connected to the product outlet, the product can be quickly taken out and the continuous sieving operation can smoothly proceed.

[0003] Since a scraper for scraping the product is provided in the nozzle, a product that has fallen to a location far from the product outlet can be taken out without staying there.

[0003] Since a residual particle discharge port for discharging residual particles that have not passed through the sieve mesh among the raw material particles is provided on one side of the upper space of the sieve, the residual particles hinder the sieving operation by blocking the sieve mesh. Such a situation can be prevented.

Since a door capable of selecting between a closed state and an open state is provided at the residual particle discharge port, the amount of the residual particles is small.
By the way, at the stage that does not hinder the sieving work, the residual particle discharge port is closed to prevent the fine particles as a product from leaking out from here. Opening the outlet and discharging the residual particles all at once can be used properly.

Since the gate plate having a variable height is provided at the outlet of the residual particles, it is possible to adjust the ease of passage through the outlet of the residual particles, and only the residual particles having a large mass and hence a large inertia of inertia are allowed to jump over the gate plate, and the mass is reduced. It is possible to make adjustments such as small particles with small kinetic inertia and fine particles as a product that pass through the sieve mesh while remaining in the space above the sieve.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view showing a first embodiment of a sieve device of the present invention.

FIG. 2 is a top view of a nozzle in the sieve device of FIG.

FIG. 3 is a side view showing a schematic configuration of a sieving system incorporating the sieving apparatus of the present invention.

FIG. 4 is a partial vertical sectional view showing a second embodiment of the sieve device of the present invention.

FIG. 5 is a partial vertical sectional view showing a third embodiment of the sieve device of the present invention.

FIG. 6 is a horizontal sectional view of a main part of the sieve device of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 sieve device 2 base 3 raw material feeder 4 product collection tower 5 electric suction blower 6 product collection pail 7 bag filter 8 suction duct 10 device housing 11 sieve space 13 sieve net unit 14 ring 15 sieve net 16 upper sieve space 17 lower sieve space Reference Signs List 20 lid 23 raw material inlet 25 raw material dispersion plate 30 product outlet 31 bottom plate 32 bearing part 33 nozzle 34 shaft part 35 arm part 36 outlet 37 outlet 38 scraper 40 residual component outlet 41 opening 42 opening 43 residual component container 44 door 45 Support shaft 46 Gate plate 47 Groove 48 Screw

Claims (7)

[Claims] 1. A sieve device having the following configuration. a. A sieve net that divides the sieve space into an upper sieve space and a lower sieve space b. A raw material inlet formed in a lid for closing the upper surface of the above sieve space; c. A product outlet provided in the space under the sieve; d. A nozzle that blows air toward the screen while rotating below the screen. 2. The sieving apparatus according to claim 1, wherein a raw material dispersion plate is disposed below the raw material input port. 3. The sieving apparatus according to claim 1, wherein a suction duct is connected to the product outlet. 4. The sieving apparatus according to claim 1, wherein the nozzle is provided with a scraper for scraping out a product. 5. The screen according to claim 1, wherein a residual particle discharge port for discharging residual particles of the raw material that has not passed through the sieve mesh is provided on one side of the space above the sieve. A sieve device according to any of the claims. 6. A door which can select between a closed state and an open state is provided at the residual particle discharge port.
The sieve device according to 1. 7. The sieving apparatus according to claim 5, wherein a gate plate having a variable height is provided at the residual particle discharge port.