JP2002273263A - Iron powder removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron powder removing device which can be easily worked and manufactured at a low cost. SOLUTION: This device is provided with a cylinder outer cylinder formed of the hard material of low magnetic susceptibility whose part from one end to an almost center part is inserted into a carrying route carrying a fluid body, remaining part from the other end is projectingly provided on the outside and for which the flow-in/discharge port of pressure fluid is formed on at least one of the ends and a magnet body sealed inside the cylinder outer cylinder, provided with an outer diameter slightly smaller than the inner diameter of the outer cylinder, provided with packing on both end parts and movable between the inside and outside of the carrying route inside the outer cylinder. Iron powder coexisting in the fluid body is attracted and removed when the magnetic body is positioned inside the carrying route and the iron powder is dropped when the magnetic body is moved to the outside of the carrying route.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron powder removing apparatus for removing iron powder and small iron pieces (hereinafter collectively referred to as iron powder) mixed in a fluid. Iron powder removal that removes a fluid, for example, iron powder mixed in a liquid or a granular material, by inserting a magnet in a transport path for transporting the fluid and adsorbing the magnet. Related to the device.

[0002]

2. Description of the Related Art For example, it is natural that wheat or flour, which is a food powder, must be free from any impurities or contaminants. For this reason, for example, harvested wheat is cleaned many times to remove contaminants such as pebbles and sand. However, metals, especially iron abrasion powder, generated from agricultural machines such as combine harvesters, unlike other natural substances such as pebbles and sand, often have a sharply pointed shape. If the cut shape is stuck in the outer skin of wheat, it is difficult to remove it by ordinary cleaning, and it may be milled by a mill without being removed.

However, since it is not permissible for iron powder to be mixed into wheat flour, which is a food powder, a magnet is conventionally inserted into a wheat or flour transport path and iron powder is adsorbed on the magnet. To remove it. In order to increase the chances of encountering iron powder mixed with wheat or flour, the magnet inserted in such a transport path has a pitch (horizontal and vertical direction) as narrow as possible without impeding the transport of wheat or flour. Need to insert many.

In addition, if the iron powder once adsorbed on the magnet body is left for a long period of time, it may fall off due to the flow of wheat or flour. Therefore, it is necessary to periodically remove the adsorbed iron powder. Is also necessary. However, as is well known, the iron powder adsorbed on the magnet body is very difficult to remove, and moreover, the magnet body has many opportunities to encounter the wheat or the iron powder mixed into the flour. Therefore, when the iron powder is directly adsorbed on the magnet, the operation of removing the iron powder has to be very troublesome.

Conventionally, as shown in FIGS. 7 and 8, a cylindrical outer cylinder made of a non-magnetic hard material, generally a cylindrical outer cylinder made of stainless steel, is used. A magnet is inserted into the cylinder to form a magnet body.The iron powder is attracted to the outer circumference of the outer cylinder by the attractive force of the internal magnet, and when removing the iron powder, the magnet is removed from the inside of the cylindrical outer cylinder. I took it out and let the iron powder fall off. Here, FIG. 7 is a cross-sectional view taken along a plane perpendicular to the transport path of the fluid, showing an example of a conventional apparatus for removing iron powder mixed in a fluid (hereinafter, simply referred to as an iron powder removing apparatus). 8 is an enlarged view showing the relationship between the cylindrical outer cylinder and the magnet.

As shown in FIG. 7, a conventional iron powder removing device includes an air transport path (hereinafter, simply referred to as a transport path) 60 constituting a transport path of a fluid (for example, the above-described wheat or flour). , A large number of cylindrical outer cylinders 62 are arranged in parallel with each other. Here, this transport path 6
Although an apparatus that conveys a fluid by an air flow is illustrated as 0, other conveying means may be used without any problem. For example, a hopper feeder that conveys a fluid by vibration, a hopper feeder that conveys a fluid by gravity, An inclined chute from which the body flows down is exemplified.

[0007] As described above, the cylindrical outer cylinder 62 having the magnets 64 for adsorbing the iron powder therein increases the chances of encountering the iron powder mixed in the fluid, as shown in FIG.
As shown in (1), it is necessary to insert many at a narrow pitch (in both vertical and horizontal directions). For this reason, when taking out the magnets 64 and dropping the iron powder, it is extremely troublesome to take out and reinsert one by one, so that a large number of magnets 64 are usually attached to one mounting plate 66. , And the mounting plate 66 is moved in parallel with the outer cylinder 62 so that a large number of magnets 64 can be taken in and out all at once.

The mounting plate 66 is parallelized to the outer cylinder 62 along the guide rail 68a by a guide block 66a guided by a guide rail 68a provided on a base 68 supporting the transport path 60. The air cylinder 70 operates to move the rod 7
The magnet 64 is pulled out from the cylindrical outer cylinder 62 by protruding Oa and moving the mounting plate 66 to a position drawn by a two-dot chain line. When the magnet 64 is pulled out of the outer cylinder 62, the iron powder adsorbed on the outer periphery of the outer cylinder 62 by the attraction force of the magnet 64 loses the attraction force of the magnet 64 and falls off from the outer periphery of the outer cylinder 62. Fall.

At this time, a shutter 72 which constitutes the bottom plate of the transport path 60 and moves the mounting plate 66 to pull out the magnet 64 from the cylindrical outer cylinder 62 at the same time as the shutter 72 opens the bottom of the transport path 60. However, since the iron powder that has been moved and opened by the movement of the mounting plate 66 loses the attracting force of the magnet 64 and falls off through the opened shutter 72, the iron powder falls, is collected by the chute 74, and moves downward. From the system.

However, in order to move the mounting plate 66 in parallel with the cylindrical outer cylinder 62 and to move the magnets 64 in and out simultaneously, the outer cylinders 62 are parallel to each other and the magnets 64 are also parallel to the outer cylinder. The outer cylinder 62 must be arranged at exactly the same position as the outer cylinder 62, and the direction in which the mounting plate 66 moves and the direction in which the outer cylinders 62 are arranged must be completely parallel. Then, the moving direction of the mounting plate 66 and the outer cylinder 62
If the gap between the outer cylinder 62 and the magnet 64 is increased in order to increase the permissible error in the degree of parallelism between the outer cylinders 62, the attraction force of the iron powder is reduced by this gap.

Therefore, in order to prevent the attraction force of the magnet 64 from decreasing, the gap between the cylindrical outer cylinder 62 and the magnet 64 must be reduced, and the gap is disposed in the transport path 60 which is the transport path of the fluid. Cylindrical outer cylinder 6
The two must be arranged parallel to each other with high precision so that the magnet 64 can move over its entire length. In addition, it is required that the moving direction of the mounting plate 66 and the arrangement direction of the outer cylinder 62 be parallel with high accuracy, and further, the straightness of the inner diameter of the outer cylinder 62 and the outer diameter of the magnet 64 is required. Therefore, it is technically very difficult and expensive to provide the iron powder removing device in a large-sized transfer device in which the inner diameter of the transfer path 60 is 2 m or more.

[0012]

SUMMARY OF THE INVENTION The present invention solves such a problem and increases the tolerance of parallelism between cylinders without increasing the gap between the inner diameter of the cylinder and the outer diameter of the magnet. It is an object of the present invention to provide a highly practical iron powder removing device capable of performing the above.

[0013]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention provides a transport path for transporting a fluid, and a part inserted from one end to a substantially central portion of the transport path.
A cylinder made of a hard material having a small magnetic susceptibility, wherein the remaining portion from the other end is provided to protrude outside the transfer path, and at least one of the one end and the other end is provided with an inlet and an outlet for a pressure fluid. An outer cylinder, which is sealed inside the cylinder outer cylinder, has an outer diameter slightly smaller than the inner diameter of the cylinder outer cylinder, and is provided at both ends with packings which are hermetically inserted into the inner diameter of the cylinder outer cylinder, A magnet body that is slidable inside the cylinder outer cylinder and has a magnet body that can move between the inside and outside of the transfer path, and the magnet body is located inside the transfer path,
Adsorbing and removing iron powder mixed with the fluid by the attraction force of the magnet, and removing the iron powder adsorbed on the magnet by moving the magnet to the outside of the transport path. An object of the present invention is to provide an iron powder removing device.

Here, the conveying path for conveying the fluid is composed of two branched paths, one of which is arranged from the one end to the substantially central portion of the cylinder outer cylinder, and the other of which is the cylinder. When arranging the remaining portion from the other end of the outer cylinder and transporting the fluid through the one path, the magnet body sealed inside the cylinder outer cylinder is positioned on the one path side. Is preferred.

Further, in the iron powder removing device according to the present invention, the magnet body includes a plurality of small magnet bodies, and the plurality of small magnet bodies are separated by a spacer made of a non-magnetic material. Is preferred. Further, it is preferable that the fluid is a powder.

Further, in the iron powder removing apparatus according to the present invention, the pressure fluid is compressed air, and an inlet and an outlet for compressed air are provided at both ends of the cylinder outer cylinder. Preferably, the magnet body is moved from inside to outside of the flow path by switching, and the hard material having a small magnetic susceptibility is any one of stainless steel, aluminum, titanium, plastic, or a combination thereof. Is preferred.

In this specification, the term "material having a small magnetic susceptibility" is used to mean "material which is not magnetized by itself when exposed to an external magnetic field, or is not magnetized even if magnetized. In addition to the property that if the magnetic field disappears, the magnetization will almost disappear, and in addition to the property that it does not hinder the transmission of a magnetic field from others. That is, the “cylindrical outer cylinder made of a hard material having a low magnetic susceptibility” described in the following embodiments does not prevent the transmission of the magnetic field from the magnet housed inside to the outside, and this magnet is It is made of a material that returns to a state having almost no magnetism when it moves to a position.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an iron powder removing apparatus according to the present invention will be described based on a preferred embodiment shown in the accompanying drawings. FIG. 1 is a partially cutaway plan view illustrating an example of a wheat or flour (hereinafter, referred to as a fluid) transport device that employs an iron powder removing device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a plane perpendicular to the transport path along line AA in FIG.

As shown in FIG. 1, the transport device according to the present embodiment transports a fluid in the direction of a thick arrow, and a part thereof is provided with an iron powder removing device according to the present invention. The transport path 10 is divided into two rows of transport paths 12 and 14 by dividing the transport path 10 into two paths. This 2
In the portion branched to the transport paths 12 and 14 of the row, the fluid to be transported is transported through one of the two transport paths 12 and 14, and the other transport path is not used for transport.

For example, as shown in FIG.
Is used for conveyance, the fluid to be conveyed is conveyed from the conveyance path 10 through the conveyance path 12, and the other conveyance path 14 is not used for conveyance. For this reason, gates 16 and 18 are provided at the entrances and exits of the transport paths 12 and 14, and the gates 16 and 18 are used by switching the gates 16 and 18 as indicated by thin arrows.
14 can be switched.

In the present embodiment, these transport paths transport the fluid by air flow. However, other transport devices, such as a hopper feeder that transports the fluid by vibration, and a fluid that flows downward by gravity, are used. It is the same as in the prior art that there is no problem even with a tilted chute or the like. Then, the transport paths 12, 14 branched into these two rows
There is a chance that the cylinder 20, which is a main part of the iron powder removing apparatus of the present invention so as to penetrate both paths and has a magnet body enclosed therein, encounters iron powder mixed in the fluid. In order to increase the number, a large number are arranged at a narrow pitch.

As shown in FIG. 2, a large number of the cylinders 20 are arranged at a narrow pitch in the vertical direction, and the adjacent cylinders 20 further have an opportunity to encounter iron powder mixed in the fluid. It is desirable to arrange them in a staggered manner to increase the number. Similarly to the prior art, each of the two transport routes 12 and 14 forms a bottom plate of the transport route, and a shutter 22 opened by an air cylinder 24 when iron powder falls off.
And a chute 2 arranged below the shutter 22.
6.

However, the configuration of the transport routes 12 and 14 branched into these two routes is not essential, as is clear from the description that the transport routes 12 and 14 are not used for transport, and one of the transport routes, for example, As only the transport path 12,
The other transport path 14 can be omitted and configured.
At this time, since the transport path 14 is deleted, the cylinder 20 is inserted into the transport path 12 from one end to almost the center of the cylinder 20, and the remaining part from the other end is placed outside the transport path 12 outside the apparatus. In such a way as to protrude. Then, the transport route 1 branched and arranged into two routes
2 and 14, even if one of the actually used transport paths, for example, the transport path 12, is considered, one end of the cylinder 20 is inserted from one end to almost the center, and the other end is externally inserted from the other end. Are protrudingly provided.

3 to 5 are views showing details of the cylinder 20. FIG. 3 is a cross-sectional view of an assembly of the cylinder 20, FIG. 4 is a cross-sectional view showing details of an outer cylinder of the cylinder 20, FIG. 5 is a sectional view showing details of the magnet body. As shown in FIG. 3, the cylinder 20 is an assembly including a cylinder outer cylinder 28 and a magnet body 30, the length of which is shown in FIG.
As shown in FIG. 2 and FIG.
It is formed slightly longer than 2 and 14.

The cylinder outer cylinder 28 is made of a hard material having a small magnetic susceptibility, for example, stainless steel, and has a magnet body 30 sealed therein so as to be slidable in the axial direction. As shown in FIG. 4, both ends of the cylinder outer cylinder 28 are hermetically sealed with a flange 32 and a bush 34. Screws 32a and 34a for screwing a ring (not shown) are provided.

As shown in FIG. 5, the magnet body 30 is formed in a columnar shape, and its length is slightly longer than half the length of the cylinder outer cylinder 28, and is shown in FIGS.
Are formed to be substantially the same as or slightly longer than the width of the transport path 12 or 14 shown in FIG. That is, for example, when the magnet body 30 is moved to the transport path 12 side, the magnet body 30 is arranged so as to fill the width of the transport path 12.

The outer diameter of both ends 30 a of the magnet body 30 is slightly smaller than the inner diameter of the cylinder outer cylinder 28.
For example, it has a small diameter of about 0.5 to 1 mm, and is hermetically inserted into the inner diameter of the cylinder outer cylinder 28 by a packing 36 backed up by backup rings 38 formed at both ends 30 a of the magnet body 30. can do.

A guide ring 40 for preventing abnormal wear of the packing 36 is provided inside the packing 36.
The central portion 30b is provided with a diameter slightly smaller than the inner diameter of the cylinder outer cylinder 28 and excludes both end portions 30a of the magnet body 30.
Has a smaller diameter of about 0.5 to 1 mm,
Abnormal contact with the inner diameter of the cylinder outer cylinder 28 is prevented.

The thus constructed magnet body 30 is shown in FIG.
Is inserted into the outer cylinder 28 of the cylinder 20,
Both ends of the outer cylinder 28 are sealed by the flange 32 and the bush 34 to form an assembly of the cylinder 20. And
The flange 32 and the bush 34 have screws 32a, 34a
The coupling which serves as an inlet and an outlet for the pressure fluid is screwed through the, so that the magnet body 30 moves left and right inside the cylinder 20 by changing the inflow direction of the pressure fluid.

When the fluid conveyed in the conveying path 12 or 14 is a granular material, particularly wheat or flour, the pressure fluid is so contaminated that even if it leaks, it does not contaminate the fluid. Although it is desirable to use compressed air, it is not necessarily limited to this.

As shown in FIGS. 1 and 2, one cylinder 20 is attached to the assembly of the cylinders 20 configured as described above through the side walls of the transport paths 12 and 14. Here, as described above, many cylinders 20 are arranged in parallel with each other. Flange 32 and bush 3 provided at both ends of cylinder 20
4, pipes 46 and 48 are connected via couplings 42 and 44 (indicated by arrows in FIG. 2), and the pipes 46 and 48 are connected to a pump 52 via a solenoid valve 50. Have been.

Therefore, the compressed air generated by the pump 52 is switched by the solenoid valve 50 and passes through the pipe 46 or 48 to the left coupling 42 or the right coupling 44.
Can be sent to Here, the right coupling 44
When the compressed air generated by the pump 52 is sent to the left side and the piping 46 of the left coupling 42 is opened, the magnet 30 is moved to the left side, And the left conveying path 12 is in a state where many magnet bodies 30 are inserted at a narrow pitch in both the vertical and horizontal directions.

In this state, when the fluid is transported along the transport path 12 on the left side, iron powder mixed in the fluid is attracted to the outer periphery of the outer cylinder 28 of the cylinder 20 by the attraction force of the magnet 30. Will be removed from the fluid.

On the other hand, from the left transfer path 12 to the right transfer path 14 corresponding to the outside, all cylinders 2
At 0, the magnet body 30 moves to the left, so that there is no magnet body 30 inside the cylinder outer cylinder 28, and the adsorbed iron powder falls off and is removed. At this time, if the shutter 22 which is also the bottom plate of the transport path 14 is opened by operating the left air cylinder 24, the iron powder falling off from the outer periphery of the cylinder 20 and falling passes through the opened shutter 22. Are collected by the chute 26 and discharged downward.

The outer cylinder 28 of the transport path 12 on the left side
When removing iron powder adsorbed and removed on the outer periphery of
By switching the solenoid valve 50, compressed air is sent to the left coupling 42 via the pipe 46, and the left coupling 4
When the piping 48 is opened, the magnet body 30 moves to the right side, that is, outside of the transport path 12 in all the cylinders 20, so that the magnet body 30 does not exist inside the cylinder outer cylinder 28 on the left transport path 12 side. Then, the adsorbed iron powder falls off and is removed.

In the above description, the couplings 42 and 44 are provided on both sides of the cylinder 20. However, the coupling is provided only on one side and a compression spring is provided on the opposite side, and the same as in a single-acting air cylinder. Alternatively, the magnet body 30 may be moved left and right by the pressure of the compressed air and the urging force of the compression spring. In this case, as a matter of course, the solenoid valve 50 is also a single-acting type, and the piping on one side is not required.

FIG. 6 is a sectional view showing details of a magnet body 30 according to another embodiment of the present invention. FIG. 6A shows a configuration example for use in a straight tubular cylinder 28, in which a small magnet 30c and a spacer 3 made of a non-magnetic material are used.
0d are alternately arranged. With such a configuration, the magnetic field of the small magnet body 30c can be effectively applied.

FIG. 6B shows a magnet body 3 for use in a cylinder outer cylinder made of a curved pipe or a flexible pipe.
0 shows a configuration example in which small magnets 30c and spacers 30d made of a non-magnetic material are alternately arranged. Here, the spacer 30d has a convex lens shape, and the magnet body 30 has a flexible structure as a whole. With this configuration, it is possible to effectively use the magnetic field of the small magnet body 30c, and it is possible to configure the magnet body 30 that can be used for a cylinder outer cylinder formed of a curved tube or a flexible tube.

The above embodiment is an example of the present invention, and the present invention is not limited to the embodiment. Needless to say, changes and improvements may be made within the scope of the present invention. That is not. For example, the present invention relates to wheat or any flour other than flour described in the embodiment, such as food,
It is widely and suitably used for pharmaceuticals and the like.

[0040]

As described above in detail, the iron powder removing apparatus of the present invention uses the magnet body slidably sealed inside the outer cylinder of the cylinder to remove the iron powder mixed in the fluid into the cylinder. The magnet is attracted to the outer periphery of the outer cylinder, and independent magnet bodies move inside the individual cylinder outer cylinders. For this reason, unlike the prior art, in which the mounting plate moves in parallel to the cylindrical outer cylinder and moves the magnets in and out simultaneously, the cylindrical outer cylinders do not need to be parallel to each other, There is no need for the and the outer cylinder to be arranged at exactly the same position and in parallel with the outer cylinder, and further, the moving direction of the mounting plate and the arrangement direction of the outer cylinder need not be completely parallel. Accordingly, it is not necessary to increase the gap between the cylindrical outer cylinder and the magnet, and therefore, the attraction force of the magnet does not decrease.

In the apparatus for removing iron powder mixed in a fluid, since an independent magnet body moves inside each cylinder outer cylinder, unlike the prior art, the parallelism of the cylinder outer cylinder and the mounting plate are different from those of the prior art. Is not affected by the degree of parallelism, and there is no problem even if the cylinder outer cylinders are not arranged in parallel with each other, and the magnet body can freely move inside the cylinder outer cylinder. Therefore, processing for attaching the cylinder outer cylinder to the transport path becomes easy, and a device for removing iron powder mixed in the fluid can be manufactured at low cost. In addition, it is possible to reduce the gap between the cylinder outer cylinder and the magnet body, and it is possible to obtain an iron powder removing device having a stronger attraction force.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a wheat or flour conveying device employing an iron powder removing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a line AA in FIG.

FIG. 3 is a sectional view of a cylinder assembly.

FIG. 4 is a sectional view showing details of an outer cylinder of the cylinder.

FIG. 5 is a sectional view showing details of a magnet body.

FIGS. 6A and 6B are cross-sectional views illustrating details of a magnet body according to another embodiment.

FIG. 7 is a cross-sectional view of a plane perpendicular to a fluid transport path, showing an example of a conventional apparatus for removing iron powder mixed in a fluid.

FIG. 8 is an enlarged view showing a relationship between a cylindrical outer cylinder and a magnet.

[Explanation of symbols]

 10, 12, 14 Transport path 16, 18 Gate 20 Cylinder 22 Shutter 24 Air cylinder 26 Chute 28 Cylinder outer cylinder 30 Magnet 30c Small magnet 30d Spacer 32 Flange 32a Screw 34 Bush 34a Screw 36 Packing 38 Backup ring 40 Guide ring 42 , 44 Coupling 46, 48 Piping 50 Solenoid valve 52 Pump

Claims (6)

[Claims] 1. A transport path for transporting a fluid, wherein a portion from one end to a substantially central portion is inserted into the transport path, and a remaining portion from the other end is provided outside the transport path so as to protrude therefrom. A cylinder outer cylinder made of a hard material having a small magnetic susceptibility and provided with an inlet and an outlet for a pressure fluid on at least one of the other ends; an inner diameter of the cylinder outer cylinder which is sealed inside the cylinder outer cylinder; With a slightly smaller outer diameter,
At both ends, a packing is provided for airtight insertion into the inner diameter of the cylinder outer cylinder, and has a magnet body slidable inside the cylinder outer cylinder and movable between the inside and the outside of the transport path. The magnet body is located inside the transport path, so that the iron powder mixed in the fluid is sucked and removed by the attraction force of the magnet body, and the magnet body moves to the outside of the transport path. An iron powder adsorbed on the magnet body to fall off. 2. The method according to claim 1, wherein the conveying path for conveying the fluid is composed of two branched paths. One end of the cylinder outer cylinder is arranged from the one end to a substantially central portion on one path side, and the other end of the cylinder outer cylinder is disposed on the other path side. Arrange the rest from the other end of the tube,
2. The iron powder removing device according to claim 1, wherein when the fluid is transported along the one path, the magnet body sealed in the cylinder outer cylinder is positioned on the one path side. 3. . 3. The apparatus according to claim 1, wherein the magnet body comprises a plurality of small magnet bodies, and the plurality of small magnet bodies are separated by a spacer made of a non-magnetic material. The described iron powder removing device. 4. The iron powder removing device according to claim 1, wherein the fluid is a granular material. 5. The compressed fluid is compressed air, and an inlet and an outlet for compressed air are provided at both ends of the cylinder outer cylinder. By switching the path of the compressed air, the magnet body is connected to the flow path. The iron powder removing device according to any one of claims 1 to 3, wherein the device moves from inside to outside. 6. The iron according to claim 1, wherein the hard material having a small magnetic susceptibility is any one of stainless steel, aluminum, titanium and plastic or a combination thereof. Powder removal equipment.