JP7509042B2 - Magnetic sorting mechanism - Google Patents

Description

The present invention relates to a magnetic sorting mechanism, and more specifically, to a magnetic sorting mechanism used to remove small iron objects such as bolts, nuts, and nails, as well as small iron scraps (hereinafter referred to as iron pieces) when they are mixed in with the powder transported inside an inclined chute.

The powdered material targeted by this invention is a powdered material that is transported through a chute and that needs to be removed if iron pieces are mixed in, specifically, for example, wood biomass pellets and grains.

A magnetic separator is used along the transport route to remove iron from the transported goods.

For example, Patent Document 1 describes a technology that uses a belt-type magnetic separator placed above a conveyor that transports waste to separate scrap metal.

Patent Document 2 also describes a drum-type magnetic separator that has a magnet built into a pulley on the discharge end side around which a conveyor belt of a discharge conveyor that discharges crushed wood discharged from a crushing device having a crushing rotor that crushes the wood to be crushed is wrapped, and that applies a magnetic force through the conveyor belt to separate magnetic material from the crushed wood that is discharged.

However, for example, when removing iron pieces from wood biomass pellets, even if a belt-type magnetic separator is placed above the conveyor that transports the wood biomass pellets, it is difficult to magnetically attract the iron pieces inside the pile of pellets.

On the other hand, when using a drum-type magnetic separator to remove iron pieces from, for example, wood biomass pellets, even iron pieces that are at the top of the pile of pellets and far from the magnet inside the drum are attracted to some extent by the magnetic force of the magnet inside the drum as they fall from the transport conveyor. However, the time during which they are strongly subjected to the magnetic force of the magnet inside the cylindrical drum while falling is short, and some pieces are not completely attracted. To increase the time during which they are strongly subjected to the magnetic force of the magnet inside the cylindrical drum, it is necessary to increase the diameter of the drum, but to increase the diameter of the drum, it is necessary to secure a large space in the vertical direction.

On the other hand, there are manual magnetic separators that do not require power, such as bar-type magnetic separators and labyrinth-type magnetic separators, but neither is suitable for large conveying capacities (e.g., conveying capacities of 400 t/h or more).

Patent No. 6190071 JP 2006-175351 A

The present invention was made in consideration of these points, and aims to provide a magnetic sorting mechanism that can efficiently remove iron pieces from powder and granular material transported through a chute with a simple configuration, and that is easily adaptable to large transport capacities.

The present invention solves the above problems by using the following magnetic separation mechanism.

That is, the magnetic sorting mechanism according to the present invention is a magnetic sorting mechanism that includes a chute that is inclined so that powder and granular material fall under the force of gravity, a magnet that is arranged close to a partial area of the bottom surface of the chute from the outside, a magnet moving mechanism that can change the distance between the magnet and the area where the magnet is arranged close to it, and a drop speed suppression plate that is provided upstream of the partial area of the bottom surface of the chute and has a predetermined width and height that intersects with the extension direction of the chute and suppresses the drop speed of the powder and granular material, the partial area of the bottom surface of the chute includes a non-magnetic material, and the height of the drop speed suppression plate increases from the end of the width direction of the chute toward the center of the width direction.

In this application, a magnet refers to a means for applying a magnetic field, such as a permanent magnet or an electromagnet.

In addition, in this application, the "bottom surface of the chute" refers to the area made of a plate-like member that is the lower part of the cross section when the chute is cut along a plane perpendicular to the extension direction (the direction in which the powder falls inside the chute). In addition, in this application, the "outside" of the chute refers to the outside side of the internal space of the chute (the space into which the powder falls due to gravity).

In addition, in this application, the upstream and downstream of the chute are determined based on the direction in which the powder transported through the chute flows (falls), with the upper side of the chute being the upstream side and the lower side of the chute being the downstream side.

In addition, the phrase "the height of the drop speed suppression plate increases from the end of the width direction of the chute toward the center of the width direction" means that the height of the drop speed suppression plate increases when the chute moves a specified distance from the end of the width direction of the chute toward the center of the width direction. This is not limited to cases where the height of the drop speed suppression plate increases at a constant rate from the end of the width direction of the chute toward the center of the width direction, but also includes cases where the height is arc-shaped, stepped, etc.

The non-magnetic material in the area of the bottom surface of the chute may be stainless steel.

The bottom surface of the chute may be made of a flat plate.

It is preferable that the region of the bottom surface of the chute is located at the widest part of the bottom surface of the chute.

The chute may be rectangular tubular.

The magnet movement mechanism may include a handle that can be operated externally and a shaft member attached to the handle, and may be configured such that the distance between the magnet attached to the shaft member and the area of a portion of the bottom surface of the chute is changed by rotating the handle.

The magnet moving mechanism may be equipped with a cart, and the magnet may be placed on the cart in a state that matches the inclination of the bottom surface of the chute to which the magnet is placed in close proximity.

The magnet may be a permanent magnet.

It is preferable that a predetermined distance be provided between the lower end of the fall speed reduction plate and the bottom surface of the chute.

A layer thickness adjustment gate for adjusting the thickness of the layer of the powder falling through the chute may be arranged in the path between the region of the bottom surface of the chute where the magnet is arranged in close proximity and the falling speed suppression plate, and the layer thickness adjustment gate may have a gate plate arranged with a gap between it and the bottom surface of the chute, and the gap between the bottom surface of the chute and the lower end of the gate plate may be adjustable.

It is preferable that the bottom surface of the chute is provided with a step so that the area of the bottom surface to which the magnet is adjacent is lower than the other area of the bottom surface.

The chute may be configured so that a falling object recovery plate capable of recovering some of the falling objects falling through the chute can be placed downstream of the region of the bottom surface portion adjacent to the magnet in the path of the chute.

The present invention provides a magnetic sorting mechanism that can efficiently remove iron pieces from powder transported through a chute using a simple configuration, and is easily adaptable to large transport capacities.

FIG. 1 is a front view showing a magnetic separation mechanism 10 according to an embodiment of the present invention; FIG. 2 is an enlarged front view showing a portion near the magnet 12 in FIG. 1A is a bottom view of the inclined chute 80 as seen from an obliquely downward direction perpendicular to its width direction (as seen from the direction III in FIG. 1 ). FIG. 1 is a perspective view of a width-changing portion 80Y and a wide portion 80Z of an inclined chute 80. Cross-sectional view of line V-V in FIG. An exploded view showing each component of the drop speed suppression unit 16. A diagram showing a fallen object recovery plate 50

The following describes an embodiment of the present invention in detail with reference to the drawings.

1 is a front view showing a magnetic sorting mechanism 10 according to an embodiment of the present invention, FIG. 2 is an enlarged front view showing a portion near the magnet 12 in FIG. 1, FIG. 3 is a bottom view of the inclined chute 80 seen from a diagonally downward direction perpendicular to its width direction (bottom view seen from the III direction in FIG. 1), and FIG. 4 is a perspective view of the width-changing portion 80Y and the wide portion 80Z of the inclined chute 80. FIG. 5 is a cross-sectional view of line V-V in FIG. 1. FIG. 6 is an exploded view showing each member of the drop speed suppression portion 16, FIG. 6(A) is a front view of the drop speed suppression plate 16A (front view seen from the downstream side), FIG. 6(B) is a top view of the drop speed suppression plate 16A seen from the B direction in FIG. 6(A), FIG. 6(C) is a front view of the chute connecting steel 16B (front view seen from the downstream side), and FIG. 6(D) is a top view of the chute connecting steel 16B seen from the D direction in FIG. 6(C). FIG. 7 shows the fallen object recovery plate 50, where FIG. 7(A) is a front view of the fallen object recovery plate 50 (front view of the plate attached to the inclined chute 80 as seen from the downstream side), and FIG. 7(B) is a side view of the fallen object recovery plate 50 as seen from direction B in FIG. 7(A).

The magnetic separation mechanism 10 according to this embodiment comprises a magnet 12, a magnet moving mechanism 14, a falling speed suppression unit 16, and a layer thickness adjustment gate mechanism 18, each of which is attached to the inclined chute 80 or disposed adjacent to the inclined chute 80. The magnetic separation mechanism 10 efficiently removes iron pieces from the powder falling by gravity inside the inclined chute 80 using the magnetic force of the magnet 12.

The magnet 12 is a flat permanent magnet that is part of the bottom surface of the inclined chute 80 and is attached to the upright member 14A2 of the carriage 14A of the magnet moving mechanism 14 at an inclination that matches the inclination of the outer surface of the bottom plate portion 80A (bottom plate portion 80A1 where the magnet can be placed close to the magnet), which is the area where the magnet is placed close from the outside. The magnet can be placed close to the bottom plate portion 80A1 along the outer surface of the bottom plate portion 80A1 where the magnet can be placed close to the magnet. When iron pieces are mixed in with the powder falling by gravity inside the inclined chute 80, the iron pieces are attracted to the bottom plate portion 80A1 where the magnet can be placed close to the magnet by magnetic force and removed.

3 and 4, the inclined chute 80 has a general width section 80X, a width change section 80Y, and a wide width section 80Z, and these three sections have different widths. The general width section 80X occupies the majority of the inclined chute 80 and has a width of, for example, about 600 mm, while the wide width section 80Z is wider than the general width section 80X and is the widest section of the inclined chute 80 in the magnetic separation mechanism 10 according to this embodiment and has a width of, for example, about 1200 mm. The width change section 80Y is a section whose width changes and is a section that connects the general width section 80X and the wide width section 80Z. Each section of the inclined chute 80 (the general width section 80X, the width change section 80Y, and the wide width section 80Z) is made of a flat plate, and the inclined chute 80 is made of a square tube.

The magnet-proximity-possible bottom plate portion 80A1, to which the magnet 12 is adjacent, is provided in the wide portion 80Z, and the magnet 12 also has a length corresponding to the width of the wide portion 80Z. The width of the inclined chute 80 at the portion where the magnetic force of the magnet 12 acts is large, making it easier to apply a strong magnetic force to the entire layer of powder and granules even if the amount of powder and granules falling is large. For this reason, the magnetic separation mechanism 10 according to this embodiment is easily adapted to cases where the amount of powder and granules falling inside the inclined chute 80 is large, i.e., cases where a large conveying capacity is required of the inclined chute 80.

The magnet moving mechanism 14 comprises a trolley 14A, a rail 14B, a handle 14C, and a horizontal rod-shaped member 14D, and has the role of moving the magnet 12 to change the distance between the magnet 12 and the magnet-proximately positionable bottom plate portion 80A1. When removing iron pieces from the powder falling due to gravity inside the inclined chute 80, the gap between the magnet 12 and the magnet-close-placeable bottom plate portion 80A1 is set to zero, and the magnetic force from the magnet 12 is strongly applied inside the inclined chute 80 to attract the iron pieces to the magnet-close-placeable bottom plate portion 80A1. After the powder has passed through the inclined chute 80, the handle 14C is turned to move the cart 14A backward to increase the gap between the magnet 12 and the magnet-close-placeable bottom plate portion 80A1, reducing the magnetic force acting from the magnet 12 inside the inclined chute 80, and the iron pieces that were attracted to the magnet-close-placeable bottom plate portion 80A1 are dropped downward and removed (the mechanism for removing the dropped iron pieces to the outside of the inclined chute 80 will be explained later).

The magnet-proximate bottom plate portion 80A1 of the inclined chute 80 is made of non-magnetic stainless steel so that the magnet 12 is not attracted to the magnet-proximate bottom plate portion 80A1. The material constituting the magnet-proximate bottom plate portion 80A1 is not limited to stainless steel, as long as it is non-magnetic and has the specified mechanical properties.

Of the parts of the inclined chute 80, those other than the bottom plate portion 80A1 that can be placed close to the magnet do not have to be non-magnetic, but it is preferable to use a material with excellent corrosion resistance, and it is preferable to use stainless steel, like the bottom plate portion 80A1 that can be placed close to the magnet.

The wheels 14A1 of the trolley 14A are placed on rails 14B arranged horizontally toward the bottom plate portion 80A of the inclined chute 80, and as the wheels 14A1 move on the rails 14B, the trolley 14A can change the distance between the inclined chute 80, and as a result, the distance between the magnet 12 and the magnet-approachable bottom plate portion 80A1 can be changed. Note that with regard to the forward and backward movement of the trolley 14A and each part of the trolley 14A, as well as the magnet 12 placed on the trolley 14A, relative to the inclined chute 80, "forward" means the direction toward the inclined chute 80, and "rearward" means the direction away from the inclined chute 80.

When moving the cart 14A back and forth on the rail 14B relative to the inclined chute 80, the handle 14C is manually turned to rotate the horizontal rod member 14D as an axial member around its axis. The handle 14C is attached to one end of the horizontal rod member 14D. The outer surface of the horizontal rod member 14D of the magnet moving mechanism 14 is threaded, and the horizontal rod member 14D is screwed into the female screw portion 14A2a of the erect member 14A2 of the cart 14A carrying the magnet 12. When the handle 14C is turned to rotate the horizontal rod member 14D around its axis, the female screw portion 14A2a moves back and forth relative to the inclined chute 80 according to the direction of rotation, and as a result, the cart 14A and the magnet 12 placed on the cart 14A can move back and forth horizontally relative to the inclined chute 80.

A horizontal rod-shaped member 14D is provided on the outside of one end of the wide portion 80Z of the inclined chute 80 in the width direction (see Figs. 1 and 2), and a horizontal rod-shaped member 14E (see Fig. 4) is provided on the outside of the other end of the width direction. A sprocket 14C1 (see Fig. 4) is attached near the handle 14C of the horizontal rod-shaped member 14D, which has a handle 14C attached to one end, and a sprocket 14C2 (see Fig. 4) is attached to the end of the horizontal rod-shaped member 14E on the outside of the other end in the width direction. A drive chain 14C3 is stretched between the sprockets 14C1 and 14C2, and the drive force generated by rotating the handle 14C is transmitted to the sprocket 14C2 via the sprocket 14C1 and the drive chain 14C3, so that the horizontal rod-shaped member 14E on the outside of the other end of the wide portion 80Z of the inclined chute 80 in the width direction also rotates in the same way as the horizontal rod-shaped member 14D. The outer surface of the horizontal rod member 14E is also threaded, and like the horizontal rod member 14D, the horizontal rod member 14E is screwed into the upright member 14A2 of the cart 14A, and moves the cart 14A back and forth in the same way as the horizontal rod member 14D in response to the rotation of the handle 14C.

The falling speed suppression section 16 is a section provided in the width change section 80Y just before (upstream of) the wide section 80Z, and serves to temporarily receive the powder falling from the upstream side inside the inclined chute 80 due to gravity, suppressing the falling speed, and also to spread the layer of the falling powder evenly to the width of the wide section 80Z.

The fall speed suppression section 16 comprises a fall speed suppression plate 16A and a chute connecting steel 16B.

The chute connecting steel 16B has a lower flange 16B1, a web 16B2, and an upper flange 16B3, and has a structure similar to a channel steel. The chute connecting steel 16B positions the drop speed suppression part 16 at a predetermined position in the inclined chute 80, and also plays a role of reinforcing the drop speed suppression plate 16A from the rear. Both ends of the lower flange 16B1 of the chute connecting steel 16B are cut obliquely to follow the inner surface of the side of the width changing part 80Y of the inclined chute 80 (the surface on the inner space side of the inclined chute 80), and are attached by welding to the inner surface of the side of the width changing part 80Y, but in this attachment, the web 16B2 is attached so as to be perpendicular to the extension direction of the inclined chute 80 (the direction in which the powder falls inside the inclined chute 80) and so as to provide a certain gap between the lower flange 16B1 of the chute connecting steel 16B and the bottom plate part 80A.

The drop speed suppression plate 16A is attached to the web 16B2 of the chute connecting steel 16B so as to be perpendicular to the extension direction of the inclined chute 80 (the direction in which the powder falls inside the inclined chute 80) and to be located near the bottom plate portion 80A of the inclined chute 80 along the bottom plate portion 80A of the inclined chute 80, and is held in position within the inner space of the inclined chute 80. The widthwise length of the drop speed suppression plate 16A is approximately the same as the width between the side surfaces of the inclined chute 80, and is long enough so that no gap is generated between the inner surface of the side surface of the inclined chute 80 (the surface facing the inner space of the inclined chute 80) and the widthwise end of the drop speed suppression plate 16A. As shown in FIG. 6(C), near both ends of the web 16B2 of the chute connecting steel 16B, there are through holes 16B2a, and near both ends of the drop speed suppression plate 16A, there are long holes 16A2 that correspond to the through holes 16B2a. The drop speed suppression plate 16A is attached to the chute connecting steel 16B by inserting a bolt 16C through the long hole 16A2 of the drop speed suppression plate 16A and the through hole 16B2a of the web 16B2 of the chute connecting steel 16B.

As shown in Fig. 6A, the height of the fall speed suppression plate 16A increases from the end of the width direction of the inclined chute 80 toward the center of the width direction, for the following reason: In the width changing section 80Y upstream of the magnet 12, the width increases from the width of the general width section 80X to the width of the wide width section 80Z as it moves downstream. However, if the width of the layer of powder and granules that has fallen through the general width section 80X is not widened to the width of the wide width section 80Z, the magnetic force from the magnet 12 acting on the magnet-proximate base plate section 80A1 cannot be effectively utilized, and the recovery rate of iron pieces from the powder and granules cannot be sufficiently increased. Therefore, by making the shape of the drop speed suppression plate 16A as shown in FIG. 6(A) (a shape in which the height increases from the end of the width direction of the inclined chute 80 toward the center of the width direction), when the powder falling inside the inclined chute 80 passes over the drop speed suppression plate 16A, a force is applied to the powder toward the end of the width direction of the inclined chute 80, and the width of the layer of powder falling down the general width portion 80X can be expanded to the width of the wide width portion 80Z.

In addition, since the through hole provided in the drop speed suppression plate 16A is a long hole 16A2, the drop speed suppression plate 16A can be attached to the chute connecting steel 16B while adjusting the interval s between the lower end of the drop speed suppression plate 16A and the bottom plate portion 80A of the inclined chute 80. By providing a predetermined interval s between the lower end of the drop speed suppression plate 16A and the bottom plate portion 80A of the inclined chute 80, even when the amount of powder and granules is reduced at the final stage of the flow of the powder and granules dropping down the inclined chute 80 and the powder and granules can no longer overcome the drop speed suppression plate 16A, the powder and granules can still fall downward through the interval s between the lower end of the drop speed suppression plate 16A and the bottom plate portion 80A of the inclined chute 80, so that the powder and granules do not remain on the front surface of the drop speed suppression plate 16A. The size of this interval s is appropriately changed and set according to the powder and granules dropping down inside the inclined chute 80, and is usually set to about 20 to 40 mm, for example.

In addition, as shown in Figures 5 and 6 (A) and (B), an upper reinforcing plate 16A1 is attached to the upper part of the downstream surface of the fall speed reduction plate 16A in the width direction of the fall speed reduction plate 16A, reinforcing the fall speed reduction plate 16A.

In this embodiment, the drop speed suppression unit 16 is provided near the middle of the width change section 80Y (near the middle in the direction from upstream to downstream), but it may also be provided downstream where the width of the inclined chute 80 is wider than that point. It is also possible to provide the drop speed suppression unit 16 upstream of the middle of the width change section 80Y, but in that case, it may be difficult to sufficiently widen the width of the powder layer to the width of the wide section 80Z, which may reduce the efficiency of utilizing the magnetic force from the magnet 12.

The layer thickness adjustment gate mechanism 18 is a mechanism provided between the falling speed suppression section 16 and the magnet-approachable bottom plate section 80A1 in the path of the inclined chute 80. After the powder falling inside the inclined chute 80 passes over the falling speed suppression plate 16A and the width of the powder layer expands to the width of the wide section 80Z, the layer thickness is controlled to be equal to or less than a predetermined thickness and the falling speed of the powder is further reduced, thereby enabling the magnetic force from the magnet 12 acting on the magnet-approachable bottom plate section 80A1 to be more effectively utilized, thereby further improving the recovery rate of iron pieces from the powder.

The layer thickness adjustment gate mechanism 18 includes a layer thickness adjustment gate plate 18A and a handle 18B. By rotating the handle 18B, the layer thickness adjustment gate plate 18A moves up and down depending on the direction of rotation (this mechanism is the same as the movement mechanism of the magnet movement mechanism 14). The gap between the lower end of the layer thickness adjustment gate plate 18A and the bottom plate portion 80A of the inclined chute 80 is adjustable. The thickness of the layer of powder passing between the lower end of the layer thickness adjustment gate plate 18A and the bottom plate portion 80A of the inclined chute 80 is controlled by the size of the gap between the lower end of the layer thickness adjustment gate plate 18A and the bottom plate portion 80A of the inclined chute 80. The size of the gap between the lower end of the layer thickness adjustment gate plate 18A and the bottom plate portion 80A of the inclined chute 80 is appropriately changed and set according to the powder to be dropped inside the inclined chute 80, and is usually set to about 60 to 100 mm, for example. Within the range in which the layer thickness adjustment gate plate 18A moves up and down, guide plates 18A1 are attached by welding to the inner surface of both sides of the wide portion 80Z of the inclined chute 80 so as to follow both ends of the layer thickness adjustment gate plate 18A (both ends in the width direction of the inclined chute 80), and the pressure of the powder applied to the layer thickness adjustment gate plate 18A is received by the guide plate 18A1 so that the layer thickness adjustment gate plate 18A does not deform due to the pressure. The specific dimensions of the guide plate 18A1 are, for example, about 9 mm in the width direction of the inclined chute 80 and about 15 mm in the thickness direction of the layer thickness adjustment gate plate 18A.

The powder and granules that pass through the gap between the lower end of the layer thickness adjustment gate plate 18A and the bottom plate portion 80A of the inclined chute 80 pass through the magnet-proximate bottom plate portion 80A1, and at that time, the iron pieces are attracted to the magnet-proximate bottom plate portion 80A1 by the magnetic force of the magnet 12 and collected. However, between the magnet-proximate bottom plate portion 80A1 and the bottom plate portion 80A located immediately above it, a step g is provided so that the magnet-proximate bottom plate portion 80A1 is lower. This prevents the iron pieces attracted to the magnet-proximate bottom plate portion 80A1 by the magnetic force of the magnet 12 from colliding strongly with the powder and granules passing thereafter, and prevents the iron pieces attracted to the magnet-proximate bottom plate portion 80A1 from falling off due to the collision of the powder and granules passing thereafter. The height of this step g may be changed appropriately depending on the powder and granules to be dropped inside the inclined chute 80, and is usually set to about 12 to 20 mm, for example.

This section describes a method for removing iron pieces that have been attracted to the magnet-approachable bottom plate portion 80A1 by dropping them downward after the powder has finished passing through the inclined chute 80.

After the powder has passed through the inclined chute 80, the fallen object recovery plate 50 shown in FIG. 7 is placed in the path of the inclined chute 80 as shown in FIG. 1 to block the transport path of the inclined chute 80.

As shown in FIG. 7, the falling object collection plate 50 has an upper plate-like body 50A and a lower plate-like body 50B, and the upper plate-like body 50A and the lower plate-like body 50B are connected in a bent state as shown in FIG. 7(B). Two mounting L-shaped steels 50B1 are attached to the lower plate-like body 50B with a predetermined gap c by bolts and nuts 50B2. This predetermined gap c is slightly larger than the plate thickness of the bottom plate portion 80A of the inclined chute 80. When installing the falling object collection plate 50 in the inclined chute 80, the lid 52 (see FIG. 1) is opened to open the falling object collection opening 80A2 (see FIG. 1), the falling object collection plate 50 is inserted into the inclined chute 80 through the falling object collection opening 80A2, and the bottom plate portion 80A is inserted into the gap c between the two mounting L-shaped steels 50B1 to install the falling object collection plate 50 in the inclined chute 80 (see FIG. 1). A handle 50A1 is attached to the upper plate body 50A on the side opposite the side where the mounting L-shaped steel is attached, so that the fallen object recovery plate 50 can be grasped when installing and removing it from the inclined chute 80.

As shown in FIG. 1, after placing the fallen object collection plate 50 in the inclined chute 80, the handle 14C is turned to move the cart 14A backwards, increasing the gap between the magnet 12 and the magnet-proximately-placeable bottom plate portion 80A1, thereby reducing the magnetic force acting from the magnet 12 into the inclined chute 80, causing the iron pieces attracted to the magnet-proximately-placeable bottom plate portion 80A1 to fall downward. The iron pieces that fall downward collide with the fallen object collection plate 50 and are removed from the inclined chute 80 through the fallen object collection opening 80A2.

After the iron pieces that have fallen downward are removed from the inclined chute 80 through the fallen object collection opening 80A2, the fallen object collection plate 50 is removed from the inclined chute 80 and removed from the fallen object collection opening 80A2, and the fallen object collection opening 80A2 is closed with the lid 52.

As described above, the magnetic separation mechanism 10 according to this embodiment can efficiently remove iron pieces mixed in with the powder transported through the inclined chute 80 with a simple configuration, and is easily adaptable to large transport capacities.

(supplement)
In the magnetic separation mechanism 10 according to this embodiment, a flat permanent magnet is used as the magnet 12, but the magnet that can be used as the magnet 12 is not limited to a permanent magnet, and an electromagnet can also be used.

For ease of explanation, FIG. 1 shows the lid 52 of the fallen object collection opening 80A2 open and the fallen object collection plate 50 installed inside the inclined chute 80. This is the state when iron pieces attracted to the magnet-approachable bottom plate portion 80A1 are dropped downward and removed. At other times (such as when powder and granular material are passing through the inclined chute 80), the fallen object collection plate 50 is removed from the inclined chute 80 and the fallen object collection opening 80A2 is closed with the lid 52.

10...Magnetic sorting mechanism 12...Magnet 14...Magnet moving mechanism 14A...Cart 14A1...Wheels 14A2...Upright member 14A2a...Female screw portion 14B...Rail 14C...Handle 14C1, 14C2...Sprocket 14C3...Drive chain 14D, 14E...Horizontal rod-shaped member 16...Fall speed suppression portion 16A...Fall speed suppression plate 16A1...Upper reinforcement plate 16A2...Long hole 16B...Chute connecting steel 16B1...Lower flange 16B2...Web 16B2a...Through hole 16B3...Upper flange 16C...Bolt 18...Layer thickness adjustment gate mechanism 18A...Layer thickness adjustment gate plate 18A1...Guide plate 18B...Handle 50...Falling object recovery plate 50A...Upper plate-shaped body 50A1...Handle 50B: Lower plate body 50B1: L-shaped steel for mounting 50B2: Bolts and nuts 52: Lid 80: Inclined chute 80A: Bottom plate portion 80A1: Bottom plate portion capable of being placed close to a magnet 80A2: Opening for recovering fallen objects 80X: Normal width portion 80Y: Width change portion 80Z: Wide width portion c: Gap g: Step s: Distance

Claims (12)

A chute having a predetermined width and length that is inclined so that the powder or granular material falls by gravity;
A magnet is disposed adjacent to a portion of a bottom surface of the chute from the outside;
a magnet moving mechanism capable of changing a distance between the magnet and the area to which the magnet is closely disposed;
A falling speed suppression plate having a predetermined plate width and height for suppressing the falling speed of the powder or granular material;
A magnetic separation mechanism comprising:
the chute has a narrow portion having a constant length of a portion having a first width as the predetermined width, a wide portion having a constant length of a portion having a second width wider than the first width as the predetermined width, and a width changing portion having a width that changes from the first width to the second width as the predetermined width to connect between the narrow portion and the wide portion,
the width changing portion is located upstream of the region of a part of a bottom surface of the chute,
The drop speed suppression plate is provided at the width changing portion and is arranged so that a plate surface having the predetermined plate width and height is perpendicular to the extension direction of the chute,
the region of the bottom surface of the chute includes a non-magnetic material;
A magnetic sorting mechanism characterized in that the height of the falling speed suppression plate increases from the widthwise end along the bottom surface of the chute toward the widthwise center when viewed from the extension direction of the chute. The magnetic separation mechanism according to claim 1, characterized in that the non-magnetic material in the portion of the bottom surface of the chute is stainless steel. The magnetic sorting mechanism according to claim 1 or 2, characterized in that the bottom surface of the chute is made of a flat plate. The magnetic separation mechanism according to any one of claims 1 to 3, characterized in that the region of the bottom surface of the chute is located at the widest part of the bottom surface of the chute. The magnetic separation mechanism according to any one of claims 1 to 4, characterized in that the chute is a square tube. The magnetic separation mechanism according to any one of claims 1 to 5, characterized in that the magnet movement mechanism comprises an externally operable handle and a shaft member attached to the handle, and is configured so that the distance between the magnet attached to the shaft member and the area of a part of the bottom surface of the chute changes when the handle is rotated. The magnet moving mechanism includes a carriage,
7. The magnetic sorting mechanism according to claim 6, wherein the magnet is placed on the cart in a state in which the magnet is aligned with an inclination of a bottom surface of the chute to which the magnet is disposed adjacent. The magnetic separation mechanism according to any one of claims 1 to 7, characterized in that the magnet is a permanent magnet. A magnetic sorting mechanism according to any one of claims 1 to 8, characterized in that a predetermined gap is provided between the lower end of the drop speed suppression plate and the bottom surface of the chute. a layer thickness adjustment gate for adjusting a thickness of a layer of the powder or granular material falling inside the chute is disposed in a path between the falling speed suppression plate and the region of the bottom surface of the chute adjacent to the magnet,
The magnetic separation mechanism according to any one of claims 1 to 9, characterized in that the layer thickness adjustment gate has a gate plate arranged with a gap between it and the bottom surface of the chute, and the gap between the bottom surface of the chute and the lower end of the gate plate is adjustable. The magnetic separation mechanism according to any one of claims 1 to 10, characterized in that the bottom surface of the chute is provided with a step such that the area of the bottom surface to which the magnet is placed in close proximity is lower than the other areas of the bottom surface. The magnetic sorting mechanism according to any one of claims 1 to 11, characterized in that it is configured so that a fallen object recovery plate capable of recovering some of the fallen objects falling within the chute can be placed at a position downstream of the region of the part of the bottom surface to which the magnet is placed in close proximity in the path of the chute.

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