JP6721259B1 - Magnetic force sorter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic force sorting device for removing metal powder mixed in powder. SOLUTION: The magnetic powder for metal powder separation is composed of a plurality of disk-shaped permanent magnets that are stacked via a disk-shaped yoke so that adjacent magnetic poles have the same pole, and the yoke and the permanent magnet rotate integrally. And, along the tangential direction of the outer surface of each of the yokes, an injection nozzle for injecting a powder-based object to be sorted with compressed air, and a downstream side of the injection nozzle in the injection direction and passing through a metal powder separation magnet body. The suction pipe for powder collection into which the sorted objects flow, and the suction pipe for powder collection disposed downstream of the suction pipe for powder collection in the rotation direction, and the metal powder magnetically adsorbed by the magnet for metal powder separation is separated from the metal powder. It has a metal powder removing member to be removed from the body and a flow path that covers the outer peripheral surface of the yoke with the opening facing the yoke being formed, and is arranged between the injection nozzle and the powder recovery suction pipe. And a guide member for guiding the air flow so as to flow along the outer peripheral surface of the yoke. [Selection diagram] Figure 1

Description

The present invention relates to a magnetic force sorting device, and more particularly to a magnetic force sorting device capable of satisfactorily removing fine metal powder contained in powder.

The magnetic force sorting device of Patent Document 1 includes a cylindrical permanent magnet in which a large number of plate-shaped circular magnets are stacked inside a rotary cylinder. The axis of the permanent magnet does not coincide with the axis of the rotary cylinder and is eccentrically arranged. The diameter of the rotating cylinder is larger than the diameter of the permanent magnet, and the foreign metal particles adsorbed on the rotating cylinder will not be affected by the magnetic force of the permanent magnet when the rotating cylinder rotates downward, and will move toward the foreign matter receiving chute below. And fall.

The magnetic force sorting device can favorably separate metallic foreign matters contained in agricultural products such as sesame and marine products such as hijiki. It is also possible to remove powdery metallic foreign matter. However, for example, wheat flour has a fine particle size of 10 to 130 μm, and even if a certain amount is cut out from the hopper and dropped, it tends to fall in a lump state on the rotary cylinder. Further, when the mixed foreign metal is extremely small, such as about 50 μm, there is a case where the foreign metal cannot be adsorbed on the rotary cylinder in the lump state because the wheat flour itself interferes.

In the magnetic substance foreign matter removing device of Patent Document 2, a plurality of magnet rods are arranged in the chamber. The powder is charged from the upper part of the container, the powder settles downward, and the air inside is discharged from the upper part of the chamber. The metallic foreign matter is adsorbed and captured by the magnet rod, and the powder from which the foreign matter is removed is deposited on the bottom of the chamber. Since powder is deposited on the surface of the magnet rod and the adsorption force is reduced, an air injection pipe is required to blow the powder away.

In order to efficiently remove the metal mixed in the powder in the magnetic force sorting apparatus as disclosed in Patent Document 1, the powder is not in a lump state but is dispersed in the powder and is fluidized appropriately to remove the foreign metal particles. Need to be removed.

JP, 2004-9005, A JP, 2003-211022, A

An object of the present invention is to provide a magnetic force sorting apparatus for separating and removing metal powder mixed in powder.

The magnetic force sorting device according to the present invention comprises a plurality of disk-shaped permanent magnets that are stacked via disk-shaped yokes so that adjacent magnetic poles have the same polarity, and the yoke and the permanent magnets rotate integrally. A powder separating magnetic body, an injection nozzle for injecting a selection object made of powder with compressed air along a tangential direction of the outer surface of each of the yokes, and a downstream side in the injection direction of the injection nozzle, The suction pipe for powder recovery into which the sorting object that has passed through the magnet for metal powder separation flows, and the suction pipe for powder recovery, which is arranged on the downstream side in the rotation direction of the magnet for metal powder separation, A metal powder removing member that removes the metal powder magnetically adsorbed by the powder separating magnet body from the metal powder separating magnet body, and a flow path that covers the outer peripheral surface of the yoke in a state in which an opening facing the yoke is formed. the has, e Bei and a guide member in which the air flow injection nozzle has injection is guided to flow through the flow channel is arranged between the powder recovery suction pipe and the injection nozzle The guide member is provided from the position where the injection nozzle is disposed to the front of the metal powder removing member .

In the magnetic force sorting apparatus of the present invention, the flow path of the guide member is curved with a curvature that matches the curvature of the yoke .
Further , the powder recovery suction pipe is capable of moving toward and away from the metal powder separating magnet body.
Further, the metal powder removing member includes a metal powder removing magnet body and a metal powder removing suction pipe which are sequentially arranged on the downstream side of the powder collecting suction pipe in the rotation direction of the metal powder separating magnet body. It is characterized in that the metal powder adsorbed on the metal powder separating magnet body is removed by suction while being separated.

According to the magnetic force sorting device of the present invention,
(A) Since the injection nozzle that injects along the tangential direction of the outer surface of the yoke sandwiching the permanent magnet is provided, in order to supply the selection target made of powder to the outer peripheral portion of the metal powder separation magnet body together with the air flow, The powder is not deposited on the metal powder separating magnet body or agglomerated. Since the air flow passes a position extremely close to the yoke in the metal powder separating magnet body, the metal powder mixed in the powder can be favorably adsorbed by the metal powder separating magnet body and separated from the powder.
(B) Since the guide member for guiding the airflow is provided so that the flow path covers the outer peripheral surface of the yoke, the powder can be prevented from scattering outside the guide member. Further, since the flow path covers the outer peripheral surface of the yoke and the powder flows into this flow path, the powder can surely contact the yoke and the metal powder in the powder can be surely adsorbed to the yoke. ..
(C) Since a plurality of yokes and permanent magnets are laminated and a magnetic powder separating metal magnetic body that rotates integrally is provided, compared to the case where the magnetic separating metal powder is surrounded by a thin cylindrical body such as stainless steel, There is no decrease, and the strong magnetic force near the yoke can be used directly.
(D) Since the metal powder removing member for removing the metal powder adsorbed on the metal powder separating magnet body is provided, the surface of the metal powder separating magnet body can be made clean.

Since the flow path of the guide member is curved in accordance with the curvature of the yoke, the air flow can be made to flow along the outer peripheral surface of the yoke. Further, since the cross-sectional area of the flow path becomes constant, the air flow can be made to flow at a predetermined flow velocity.

Since the guide member has a structure extending from the position where the injection nozzle is disposed to the front of the metal powder removing member, the air flow flows over a long distance along the outer peripheral surface of the magnetic powder separating metal body, so that more metal powder is required. Can be adsorbed on the magnetic powder for separating metal powder.

Since the powder recovery suction tube can be moved toward and away from the metal separating magnet body, the powder recovery suction tube can be adjusted to an appropriate position for receiving the air flow from the injection nozzle, and the powder can be collected. It can be collected well.

Since the metal powder removing member is composed of the metal powder removing magnet body and the metal powder removing suction tube, the metal powder adsorbed on the metal powder removing magnet body can be separated and removed by the strong magnetic force of the metal powder removing magnet body. Further, the suction tube for removing metal powder has a suction force, and can suck and remove metal powder floating around the metal body for removing metal powder.

It is a side view which shows the structure of the Example of the magnetic force selection apparatus by this invention. 2 is a perspective view of the embodiment of FIG. 1. FIG. It is a perspective view from the bottom of the guide member used for the Example of FIG. It is a front view which shows a metal powder separation magnet body. It is a front view which shows the magnet body for metal powder removal. It is a side view which shows the structure of the magnetic force selection apparatus of another Example of this invention. FIG. 7 is a perspective view of the device of FIG. 6. FIG. 8 is a perspective view of the device of FIG. 6 viewed from the opposite side of FIG. 7. (A), (B), (C) is sectional drawing which shows the modification of a flow path. It is a side view which shows another Example of a guide member. It is a side view which shows another Example of a guide member. It is a side view which shows the magnetic force selection system incorporating the magnetic force selection device.

Hereinafter, a magnetic force sorting device according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 5 show an embodiment of the magnetic force sorting apparatus 100 of the present invention. As shown in FIG. 1, the magnetic force sorting apparatus 100 has a housing 100a that surrounds the entire body, and in the housing 100a, a metal powder separating magnet body 3, an injection nozzle 4, and a powder collecting suction tube 6 are provided. The metal powder removing member 10 and the guide member 11 are arranged. As shown in FIG. 2, the sorting target 7 is supplied to the injector 25 and then to the injection nozzle 4 together with the compressed air 20 sucked in the injector 25.

As shown in FIG. 4, the metal powder separating magnet body 3 is formed by laminating a disk-shaped permanent magnet 2 and a disk-shaped yoke 1 made of soft iron. That is, the permanent magnet 2 has a structure in which the thin disk-shaped yoke 1 is sandwiched between the permanent magnets 2. The permanent magnets 2 are arranged so that the N poles and the N poles and the S poles and the S poles face each other, so that the adjacent magnetic poles are adjacent to each other. It is the same pole. Since the magnetic force lines gather on the outer peripheral portion of the yoke 1, a strong magnetic force can be obtained. In this structure, the metal powder is adsorbed to the surface of the yoke 1 instead of the surface of the permanent magnet 2. The yoke 1 has a thickness of about 3 to 5 mm. The plurality of yokes 1 and the plurality of permanent magnets 2 have a common rotating shaft 31, and the rotation of the rotating shaft 31 causes the yoke 1 and the permanent magnets 2 to integrally rotate.
The sorting target 7 to which the present invention is applied is powder such as wheat flour and skim milk powder having a particle size of 10 to 100 μm. Not only food but also inorganic silica powder can be handled.

The injection nozzle 4 injects the sorting target 7 with compressed air. The injection nozzle 4 injects the air flow of the sorting target 7 along the tangential direction of the outer periphery of each yoke 1 in the metal powder separating magnet body 3. Therefore, a plurality of injection nozzles 4 are provided so as to correspond to the respective yokes 1. The air flow from the injection nozzle 4 flows along the tangential direction of the outer periphery of the yoke 1 of the metal powder separating magnet body 3, and the objects to be sorted are sprayed in a state of being dispersed in the air. The axial diameter of the jet flow is thin and linear. The straight portion of the jet flow preferably has a length of about 5 to 15 cm.

The guide member 11 is arranged in a straight pipe state between the jet nozzle 4 and the powder recovery suction pipe 6, and guides the air flow jetted by the jet nozzle 4 so as to flow along the outer peripheral surface of the yoke 1. .. The guide member 11 is provided corresponding to each yoke 1. As shown in FIG. 3, each guide member 11 is formed with an opening 11b having a length along the outer peripheral surface of the yoke 1, and the guide member 11 is provided with the opening 11b by facing the yoke 1. A flow channel 11a is formed to cover the outer peripheral surface of 1. The air flow including the sorting target 7 made of powder flows through the flow paths 11a of the respective guide members 11, whereby the metal powder mixed in the sorting target 7 is adsorbed to the outer peripheral surface of the yoke 1. That is, as shown by the track K1 in FIG. 1, the metal powder 9 is adsorbed on the outer peripheral surface of the yoke 1, while the sorting object 7 itself flows linearly in the yoke 1 as shown by the track K2. It flows to the side of the suction pipe 6 for recovery.

The powder collecting suction pipe 6 collects the powder from which the metal powder 9 has been removed, and is arranged on the downstream side of the guide member 11. The object to be sorted 7 which has passed through the magnet body 3 for separating metal powder flows into the suction pipe 6 for collecting powder. As shown by the arrow, the powder recovery suction pipe 6 can move toward and away from the metal powder separating magnet body 3. Proper positioning prevents the linear airflow from spreading and dispersing within the housing 100a. This movement is preferably done along the tangential direction of the yoke 1. As a result, the powder in the sorting target portion 7 can be efficiently introduced.

At the suction port 6a at the tip of the powder collecting suction tube 6, the lower portion is approached to the yoke 1 while the upper portion is cut away in an oblique direction. As a result, the sorting target 7 that flows through the yoke 1 can efficiently flow into the powder recovery suction pipe 6.

The metal powder removing member 10 is arranged on the downstream side of the powder collecting suction pipe 6 in the rotation direction of the metal powder separating magnet body 3. The metal powder removing member 10 includes a metal powder removing magnet body 12 and a metal powder removing suction pipe 13, and the metal powder removing magnetic body 12 is arranged on the upstream side and the metal powder removing suction pipe 13 is arranged on the downstream side. Has been done. The metal powder removing magnet body 12 separates the metal powder 9 adsorbed by the metal powder separating magnet body 3. The suction tube 13 for removing metal powder has a strong suction force, and sucks the metal powder 9 adsorbed by the magnet body 3 for separating metal powder and the metal powder 9 adsorbed by the magnet body 12 for removing metal powder. To do. As a result, the surface of the metal powder separating magnet body 3 is made clean.

FIG. 5 is a front view of the metal powder removing magnetic body 12. The metal powder removing magnetic body 12 has a structure similar to that of the permanent magnet 2 constituting the metal powder separating magnet body 3, and the surface is covered with a cover 12a. After the operation is completed, the metal powder removing magnetic body 12 is taken out from the housing, and the permanent magnet inside is taken out. As a result, the metal powder 9 adsorbed on the cover 12a can be shaken off without being affected by the magnetic force, so that the metal powder can be easily collected.

According to such a magnetic force sorting apparatus 100, the jet nozzle 4 that jets along the tangential direction of the outer surface of the yoke 1 that sandwiches the permanent magnet 2 is provided, and the sorting target made of powder is magnetized together with the air flow into the magnet for separating metal powder. Since the powder is supplied to the outer peripheral portion of the body 3, the powder is not deposited on the metal powder separating magnet body 3 or agglomerated. Since this air flow passes through a position extremely close to the yoke 1 in the metal powder separating magnet body 3, the metal powder mixed in the powder can be favorably adsorbed by the metal powder separating magnet body and separated from the powder. ..
In addition, since the magnetic powder for separating metal powder 3 provided by laminating a plurality of yokes 1 and the permanent magnet 2 and rotating integrally is provided, compared with the case where the magnetic powder for separating metal powder 3 is surrounded by a thin cylindrical body such as stainless steel. The strong magnetic force in the vicinity of the yoke 1 can be directly used without any decrease in magnetic force.
Further, since the flow path 11a covers the outer peripheral surface of the yoke 1 and the guide member 11 for guiding the air flow is provided, the powder can be prevented from scattering to the outside of the guide member 11. Moreover, since the flow path 11a covers the outer peripheral surface of the yoke 1 and the powder (sorting target 7) flows into the flow path 11a, the powder can surely contact the yoke 1 and The metal powder can be surely adsorbed to the yoke 1.

6 to 8 show another embodiment of the present invention. As shown in FIG. 6, the magnetic force sorting apparatus 100 removes the metal powder mixed in the sorting target by the metal powder separating magnet body 3 provided inside the housing 100a. Inside the housing 100a, in addition to the metal powder separating magnet body 3, an object to be sorted is jetted with compressed air along the tangential direction of the outer peripheral surface of the yoke 1, and is jetted from the jet nozzle 4. A guide member 11 for guiding an air flow containing powder to flow along the outer peripheral surface (outer peripheral surface of the yoke 1) of the metal powder separating magnet body 3, and the metal powder provided at the end portion of the guide member 11. The powder collecting suction pipe 6 that sucks and collects the object to be sorted that has passed through the separating magnet body 3, and the powder collecting suction pipe 6 is provided on the downstream side and is attracted to the metal powder separating magnet body 3. And a metal powder removing member 10 for removing the metal powder present.

The metal powder separating magnet body 3, the injection nozzle 4, the powder collecting suction pipe 6, and the metal powder removing member 10 have the same structures as those of the above-described embodiment shown in FIGS. .. The flow path 11a of the guide member 11 of this embodiment is arranged along the outer peripheral surface of the yoke 1 in the magnet body 3 for separating metal powder. That is, the flow path 11a has a curvature that matches the curvature of the disk-shaped yoke 1 and is formed in a curved shape. Since the flow path 11a is formed in the curved shape in this way, the entire guide member 4 is also formed in the curved shape, and covers almost the half circumference of the metal powder separating magnet body 3. As a result, the guide member 11 is provided from the position where the injection nozzle 4 is disposed to the front of the metal powder removing member 10. As a result, the flow path 11a of the guide member 11 is long, and the selection target 7 in the flow path 11a is in contact with the outer peripheral surface of the yoke 1 as much as the length of the flow path 11a increases. It is possible to reliably adsorb the metal powder that is present.

FIGS. 9A to 9C are examples of three different guide members 11 and correspond to the AA cross-sectional view of FIG. 6. In each of the guide members 11 (A) to (C), the outer peripheral surface side of the yoke 1 serves as a flow path 11 a, which forms a flow path for the air flow of the powder 7. The flow path 11a has an opening 11b whose bottom surface facing the yoke 1 is opened, and an air flow can come into contact with the yoke 1 through the opening 11b. Therefore, the metal powder 9 is attracted to the surface of the yoke 1 by the magnetic force of the permanent magnet 2. FIG. 9A shows a structure in which the duct portion 11a does not project. 9(B) and 9(C) are different in that the duct portion 11a projects and the outer shape is rectangular or round.

FIG. 10 shows an internal configuration when the guide member 11 is shortened as compared with FIG. That is, in the guide member 11 shown in FIG. 10, the position where the injection nozzle 4 is arranged is the starting point and extends along the outer peripheral surface of the magnetic body 3 for separating metal powder (yoke 1), and the end thereof is the metal powder separating body. The area is shorter than 1/4 of the outer peripheral length of the magnetic body 3 (yoke 1). When the magnetic force of the permanent magnet 2 is strong, the metal powder 9 is immediately adsorbed on the metal body 3 for separating the metal powder, so that the metal powder is surely adsorbed and removed even with such a short guide member 11.

FIG. 11 shows a magnetic material 3 for separating metal powder having a structure in which the permanent magnet 2 is surrounded by a rotating cylinder 27 made of metal. The lower left portion of the permanent magnet 2 is cut out to facilitate the recovery of the metal powder 9. Since the lower left portion of the permanent magnet 2 can reduce the magnetic force by the notch in the lower left portion, the metal powder 9 can be easily collected by the metal powder removing magnet body 12 and the metal powder removing suction tube 13. The rotary cylinder 27 is rotated by the rotation of the rotary shaft 31. On the other hand, the permanent magnet 2 is attached to the rotating shaft 31 but does not rotate. Although not shown in FIG. 9, balance weights are provided at both ends in the longitudinal direction of the permanent magnet 2 so that the cutout portion of the permanent magnet 2 faces downward left.

FIG. 12 is an example of a magnetic force sorting system 200 incorporating the magnetic force sorting device 100. The sorting system 200 includes a magnetic force sorting device 100 and its peripheral devices. The powder collecting suction pipe 6 is connected to the first cyclone 21, and the powder is collected at the bottom by sedimentation. The suction pipe 13 for removing metal powder is connected to the second cyclone 22, and the metal powder 9 is settled and collected at the bottom. Metal powder fixing means 23 is provided at the bottom of the second cyclone 22, and the metal powder 9 is fixed to the three magnet rods 23a. The magnet rod 23a is covered with a stainless cover, and when the magnet rod 23a is pulled out from the cover cylinder, the metal powder 9 falls, so that the metal powder 9 can be easily collected after the operation is completed.

As shown in FIG. 12, the injection nozzle 4 of the magnetic force selection device 100 is connected to the powder supply device 29. The powder supply device 29 is of a constant supply type, and powder is conveyed by a screw conveyor 19 driven by a motor 18. The sorting target 7 made of the powder 7 is fed into the injector 25 via the screw conveyor 19 in a fixed amount. The powder 7 is pushed out by the compressed air 20 by the injector 25 and jetted from the jet nozzle 4. The tank of the powder supply device 29 includes a main tank 14 and a sub tank 15. The powder sorting target 7 put into the main tank 14 is fluidized by the flowing air 16 and then enters the sub tank 15 to be settled. A mesh vibrator 17 is provided at the bottom of the sub-tank 15, and the powder is sent to the screw conveyor 19 so as not to be lumped.

According to the above invention,
(A) Since the injection nozzle 4 capable of injecting powder in the tangential direction of the outer peripheral surface of the metal powder separating magnet body is provided, the metal powder separating magnet body 3 adsorbs the metal powder passing nearby to remove the metal powder. It can be separated from powder.
(B) Since the guide member 11 that covers the outer peripheral surface of the yoke and guides the air flow is provided, the powder can be prevented from scattering outside the guide member. Further, since the powder flows along the outer peripheral surface of the yoke 1, the powder can surely contact the yoke 1, and the metal powder in the powder can be surely adsorbed to the yoke.
(C) Since the guide member 11 that covers the yoke 1 is provided and the metal powder is adsorbed on the surface of the yoke 1, as compared with the case where a metal rotary cylinder is provided and the metal powder is adsorbed on the surface of the rotary cylinder, The strong magnetic force near the yoke 1 can be used directly.
(D) Since the metal powder removing member 10 including the metal powder removing magnet body 12 and the metal powder removing suction tube 13 is provided, the surface of the metal powder separating magnet body can be made clean.

INDUSTRIAL APPLICABILITY The present invention is suitable as a magnetic force sorting device for removing metallic foreign matters mixed in powder.

1 Yoke 2 Permanent Magnet 3 Magnet Body for Separation of Metal Powder 4 Injection Nozzle 6 Suction Tube for Powder Collection 7 Sorting Target (Powder)
9 metal powder 10 metal powder removing member 11 guide member 11a flow path 11b opening 12 metal powder removing magnet body 12a cover 13 metal powder removing suction pipe 14 main tank 15 sub tank 16 flowing air 17 mesh vibrator 18 motor 19 screw conveyor 20 Compressed Air 21 1st Cyclone 22 2nd Cyclone 23 Metal Powder Fixing Means 23a Magnet Rod 25 Injector 26 Powder Recovery Tank 27 Rotating Tube 28 Hose 29 Powder Supply Device (Quantitative Supply Type)
31 rotating shaft 100 magnetic force sorting device 100a housing 200 magnetic force sorting system

Claims (4)

A magnetic powder separation metal magnetic body that is composed of a plurality of disk-shaped permanent magnets that are stacked via a disk-shaped yoke so that adjacent magnetic poles have the same polarity, and that the yoke and the permanent magnet rotate integrally.
Along the tangential direction of the outer surface of each of the yokes, an injection nozzle for injecting a sorting object made of powder with compressed air
A suction pipe for powder recovery, which is provided on the downstream side in the jet direction of the jet nozzle, and into which the sorting target that has passed through the metal body for separating metal powder flows in,
The metal powder is disposed on the downstream side of the powder collecting suction pipe in the rotation direction of the metal powder separating magnet body, and the metal powder magnetically adsorbed by the metal powder separating magnet body is removed from the metal powder separating magnet body. A metal powder removing member,
The nozzle has a flow path that covers the outer peripheral surface of the yoke in a state where an opening facing the yoke is formed, and is disposed between the spray nozzle and the powder recovery suction pipe to spray the spray nozzle. Bei example a guide member is air flow to guide the flow through the flow channel, and
The magnetic force sorting device , wherein the guide member is provided from a position where the injection nozzle is disposed to a position in front of the metal powder removing member . The magnetic force sorting device according to claim 1, wherein the flow path of the guide member is curved with a curvature that matches the curvature of the yoke. The magnetic force sorting device according to claim 1, wherein the powder collecting suction pipe is movable toward and away from the metal powder separating magnet body. The metal powder removing member includes a metal powder removing magnet body and a metal powder removing suction tube, which are sequentially arranged on the downstream side in the rotation direction of the metal powder separating magnet body with respect to the powder collecting suction tube. The magnetic force sorting device according to claim 1, wherein the metal powder adsorbed on the metal body for separating metal powder is removed by suction while separating the metal powder.

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