JPH11156232A - Method for sorting steel particles - Google Patents

Abstract

(57) [Problem] To provide a method of separating steel particles that can stably separate mixed steel particles having large and small particle diameters into an arbitrary set size. SOLUTION: A magnet is used to separate steel particles,
By controlling the magnetic flux density of the adsorption plate on which the magnets are arranged, small particles smaller than the set size are adsorbed to the adsorption plate or the sliding speed is reduced and separated from the steel particles containing large and small particles. how to.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating steel particles, such as a blast material used for blasting or shot peening, into particles having an arbitrary particle size.

[0002]

2. Description of the Related Art Conventionally, steel blasting materials used for blasting or shot peening are gradually worn in the process of use and their particle diameters become smaller. It is withdrawn and refilled with a new blasting material of normal particle size. The separation of the blasting material for extracting the blasting material having a small particle size due to the abrasion is performed by using a wind separator or a vibrating sieve. It is known that a rotating magnet roll is used to separate the projection material from the impurities, but this is not to separate the projection material according to the particle size but to remove the impurities.

[0003]

In the case of the separation of the blast material using the above-mentioned wind separator, it is necessary to keep the wind speed of the wind selector at a constant speed, but the air flow for the separation is sent to a blast device or a peening device. Generally, the suction air of the attached dust collector is also used, and the performance (air volume) is reduced due to clogging of the filter cloth of the dust collector, etc., and accordingly, the separation performance of the wind separator is also reduced and the predetermined projection is performed. There was a problem that it was not possible to separate the material into particle sizes. Further, in recent years, there has been a tendency to frequently use a projection material having a diameter of 0.2 mm or less, and in the case of such a small-diameter projection material, it has become difficult in principle to separate it with a wind separator.
In the case of separation of blast materials using a vibrating sieve, the separation performance is stable with a new sieve, but the classification performance deteriorates due to changes in the sieve mesh over time or damage to the wire mesh. was there. The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for separating steel particles that can stably separate mixed large and small-sized steel particles into an arbitrary set size.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a method for separating steel particles according to the present invention comprises, first, controlling the magnetic flux density of an electromagnet or a permanent magnet disposed on the back,
Below the adsorbing plate capable of adsorbing small particles smaller than the set size, steel particles are introduced and sorted into small particles smaller than the set size adsorbed to the adsorber plate and large particles not adsorbed,
The method is characterized in that the adsorbed small particles are separated from the adsorbing plate.Secondly, by controlling the magnetic flux density of an electromagnet or a permanent magnet disposed on the back, small particles having a size equal to or less than a set size can be adsorbed. On the inclined upper surface of the inclined adsorption plate, the steel particles are slid to be classified into small particles having a size equal to or less than a set size adsorbed to the adsorption plate and large particles not adsorbed, and the adsorbed small particles are adsorbed. It is characterized by being peeled off from the board,
Third, by controlling the magnetic flux density of the electromagnet or the permanent magnet disposed on the back part, the steel particles are slid on the inclined upper surface of the suction plate which is inclined so as to decelerate the small particles smaller than the set size. Characterized by having a difference in the flight distance of the steel particles dropped from the lower end of the inclined suction plate and separating them into small particles with a short flight distance and large particles with a long flight distance. It is.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Basic Experiment) The inventor made the following experiment, thinking of using a magnet as a means for separating steel particles.
In the experiment, as shown in FIG.
Is provided with a gap t, and by changing the gap t, the magnetic flux density of the adsorbing plate 1 is controlled.
FIG. 1 shows the results of measuring the magnetic flux density when each of the particle sizes (small particles s, large particles S) is adsorbed on the adsorbing plate 1 using a true sphere (bearing ball) of 5 mm or less. The magnetic flux density according to the set size of the steel particles to be separated is determined from the graph of FIG. The gap t between the permanent magnet and the attracting plate 1 is adjusted so that the attracting plate 1 has the determined magnetic flux density.
Is adjusted. When an electromagnet is used, the magnetic flux density can be changed by changing the current.

Next, the separation of the steel particles will be described in detail with reference to FIGS. In the first separation, as shown in FIGS. 3 and 4, a charging means 11 is provided at one end, and a large particle receiving hopper 1 is provided at the other end.
A flat belt conveyor 13 provided with a flat plate conveyor 2 is disposed. Above the central portion of the flat belt conveyor 13, a disk-shaped suction plate 15 horizontally rotated by a rotating unit 14 has one half thereof positioned above the flat belt conveyor 13. It is provided in a state where the other half is placed outside the flat belt conveyor 13. Further, a permanent magnet 1 is provided above the attraction plate 15 at a position corresponding to the flat belt conveyor 13 with a gap t.
The gap t is adjustable so that the magnetic flux density of the suction plate 15 can be set to a predetermined value. The gap t is adjusted so as to have a magnetic flux density corresponding to the set size of the steel particles separated from the graph of FIG. Further, a small particle receiving hopper 17 is disposed below the suction plate 15 at a position off the flat belt conveyor 13.

[0007] In the apparatus constructed as described above, the steel particles (projection material in the embodiment) having large and small particle diameters are continuously charged from the charging means 11 onto the flat belt conveyor 13, moved and rotated. To rotate the suction plate 15. As a result, the small particles s having a size equal to or smaller than the set size of the blast material moved below the attraction plate 15 are attracted to the attraction plate 15 and rotated to be moved to a position beyond the magnetic force deviating from the permanent magnet 16 so that the small particles s are small. It is dropped on the body receiving hopper 17. On the other hand, the large particles S having a size equal to or larger than the set size that has not been adsorbed by the adsorption plate 15 are dropped from the other end of the flat belt conveyor 13 to the large particle receiving hopper 12. As a result, the blast material is classified into large and small particle sizes centering on the particle size of the set size. In the above embodiment, a permanent magnet was used as the magnet, but an electromagnet may be used. In the case where an electromagnet is used, the magnetic flux density of the attraction plate 15 can be changed by changing its current. No adjustment is required.

Next, in the second separation, as shown in FIGS. 5 and 6, one end is provided with a charging means 21 and the other end is provided with a large particle receiving hopper 22, and an inclined disk-shaped suction plate 25 is provided. Is provided so as to be rotatable by the rotating means 24.
A permanent magnet 26 is provided at the back of the lower surface side of the steel sheet 5 with a gap t. The gap t is adjusted according to the set size of the steel particles in the same manner as in the case of the first separation, and the suction plate 25 is moved. It is set so as to have a predetermined magnetic flux density. A scraper 28 is disposed at a position upstream of the large particle receiving hopper 22 on the lower side of the suction plate 25, and a small particle receiving hopper is disposed at a position below the suction plate 25 corresponding to the scraper 28. 27 are arranged.

In the above-described structure, a steel ball in which large and small particles are mixed on the adsorbing plate 25 from the input means 21 while rotating the adsorbing plate 25 in the direction of the arrow via the rotating means 24 (see FIG. In this case, the shot material is continuously supplied.
As a result, the small particles s of the projection material having a size equal to or less than the set size are obtained.
Is sucked by the suction plate 25, rotated, scraped off by the scraper 28, and dropped into the small particle receiving hopper 27. On the other hand, the large particles S having a size equal to or larger than the set size that is not adsorbed by the adsorption plate 25 roll down on the inclined surface of the adsorption plate 25 and fall to the large particle receiving hopper 22, and the projectile material has a large and small particle size similarly to the first sorting. It is separated into things. In this case also, the permanent magnet 26
The magnet density can be changed by changing the current.

Next, as shown in FIG. 7, an inclined suction plate 35 having a charging means 31 at one end is fixedly arranged, and a permanent magnet 3 is provided on the back of the lower surface of the suction plate 35 as shown in FIG.
6 are provided with a gap t. The gap t between the attracting plate 35 and the permanent magnet 36 is a small particle s having a size equal to or smaller than a set size.
Is adjusted so that the magnetic flux density is such that it is decelerated when sliding on the inclined surface of the suction plate 35. Further, a small particle receiving hopper 37 is disposed below the inclined suction plate 35 near the lower end of the suction plate 35, and a large particle receiving hopper 32 is disposed farther from the lower end of the suction plate 35. I have.

In the above-described apparatus, the input means 31 continuously feeds steel particles (projection material in this embodiment) in which particles having large and small particle sizes are mixed on the adsorbing plate 35. As a result, the small particles s having a size equal to or less than the set size in the projection material are
Under the influence of the magnetic force of the suction plate 35, the sliding speed is reduced and the slide plate is slowly slid down, and falls down from the lower end of the suction plate 35 to the small particle receiving hopper 37 in a state of falling by its own weight. On the other hand, the large particles S having a size equal to or larger than the set size are rolled and slid down almost without being affected by the magnetic force of the suction plate 35, discharged far from the lower end of the suction plate 35, dropped into the large particle receiving hopper 32, and projected. The materials are classified into large and small particle sizes based on the set size. Also in this case, an electromagnet may be used instead of the permanent magnet 36, and the magnetic flux density can be changed by changing the current as in the first and second cases. In the third fractionation, the small particles s are not adsorbed on the adsorbing plate 35, so there is no need to forcibly separate them. Further, it is desirable that the magnetic flux density distribution of the attraction plates 15, 25, and 35 is made dense and uniform like a magnet sheet. In the first to third classifications, very small particles are adjusted by adjusting the magnetic flux density. It was confirmed that projectiles with different diameters could be separated, but they were used as projectiles.
What is necessary is just to apply to the range of 0.02-2.5 mm.

[0012]

As is apparent from the above description, the present invention uses magnets for separating steel particles and controls the magnetic flux density of the adsorbing plate on which the magnets are arranged to mix large and small particles. Small particles smaller than the set size are adsorbed to the adsorbing plate or the sliding speed is reduced from the steel particles that have been separated so that the separation process can be performed stably according to the set size. There are various excellent effects, for example, it is possible to separate a shot material which is a steel particle having a small particle size.

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a particle diameter of a steel particle body and a magnetic flux density of an adsorption plate.

FIG. 2 is a schematic diagram of a basic experiment.

FIG. 3 is a schematic view showing a first steel particle sorting mechanism.

FIG. 4 is a left side view in FIG. 3;

FIG. 5 is a schematic view showing a second steel particle body sorting mechanism.

FIG. 6 is a right side view in FIG.

FIG. 7 is a schematic view showing a third steel particle sorting mechanism.

[Explanation of symbols]

 12 22 32 Large particle receiving hopper 13 Flat belt conveyor 14 24 Rotating means 15 25 35 Adsorbing plate 16 26 36 Permanent magnet 17 27 37 Small particle receiving hopper t Gap

Claims (8)

[Claims] 1. A steel particle body is introduced below an adsorbing plate capable of adsorbing small particles having a size smaller than a set size by controlling a magnetic flux density of an electromagnet or a permanent magnet disposed on a back portion thereof. A method for separating steel particles, comprising: sorting into small particles smaller than a set size to be adsorbed and large particles not to be adsorbed, and separating the adsorbed small particles from the adsorption plate. 2. A method of controlling the magnetic flux density of an electromagnet or a permanent magnet disposed on a back portion to slide a steel particle on an inclined upper surface of an inclined adsorption plate which is capable of adsorbing a small particle having a size smaller than a predetermined size. A method for separating steel particles, comprising separating into a small particle having a size equal to or less than a set size to be adsorbed to the adsorption plate and a large particle not adsorbed, and separating the adsorbed small particle from the adsorption plate. 3. A steel particle body is slid on an inclined upper surface of an attraction plate which is inclined so as to control the magnetic flux density of an electromagnet or a permanent magnet disposed on a back portion to slide and decelerate small particles having a size smaller than a set size. It is characterized by having a difference in the flight distance of the steel particles dropped from the lower end of the inclined suction plate and separating them into small particles with a small flight distance and large particles with a large flight distance. A method for separating steel particles. 4. The method according to claim 1, wherein the control of the magnetic flux density changes a gap between the electromagnet or the permanent magnet and the attraction plate. 5. The method according to claim 1, wherein the control of the magnetic flux density changes a current of the electromagnet.
Or the method for separating steel particles according to 3. 6. The method according to claim 1, wherein the separation of the small particles adsorbed on the attraction plate moves the small particles together with the attraction plate to a position beyond the magnetic force of the electromagnet or the permanent magnet. Item 4. The method for separating steel particles according to Item 2. 7. The separation of steel particles according to claim 1, wherein the separation of the small particles adsorbed on the adsorption plate forcibly scrapes the small particles from the adsorption plate. Method. 8. The steel particle body has a thickness of 0.02 to 2.5 mm.
The method according to any one of claims 1 to 7, wherein the shot material is a shot material for blasting or shot peening.