JP2001000883A - Metal removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent granular substances from being stuck and deposited onto the surface of magnet rods in a metal removing device by which metal mixed in the granular substances is magnetically attracted by the magnet bars and removed. SOLUTION: This device is provided with a body 10 arranged in a conveying path for granular substances and provided with a granular substance path 17 through which granular substances are passed and plural magnet bars 27 arranged on the body 10 so that they traverse the granular substance path 17. Metal mixed in the granular substances passed through the granular substance path 17 is magnetically attracted by the magnet bars 27 and removed from the granular substances. The device for removing metal is provided with a rotary driving mechanism 14 for rotating at least part of the plural magnet bars 27 around the axis lines N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to cereals, processed cereals, sweeteners, food additives, additives listed in the local government, processed foods, etc. in the field of the food industry, the pharmaceutical industry, the chemical industry, the ceramic industry, and the mining industry. The present invention relates to a metal removing device for magnetically adsorbing and removing metals such as iron pieces and fine iron powder mixed in powders such as raw materials in fields such as raw materials.

[0002]

2. Description of the Related Art In the process of treating powder in the production of food, etc., metals such as iron flakes and fine iron powder may be mixed into the powder due to various causes such as peeling and falling off from rotating equipment. .

On the other hand, conventionally, a main body having a powder passage through which the powder passes, and a plurality of magnet rods arranged in the main body so as to cross the powder passage, have been used. 2. Description of the Related Art There has been provided a metal removing apparatus for removing metal mixed in powder particles passing through a particle passage from a powder material by magnetically adsorbing the metal with a magnet rod.

In this type of metal removing device, if the powder adheres and accumulates on the surface of the magnet bar and the surface of the magnet bar is covered with the powder, the metal removing efficiency is reduced. Further, as the accumulation of the powder on the surface of the magnet rod progresses, so-called bridging occurs in which the powder deposited on the adjacent magnet rod is connected, and the powder passage may be blocked by the powder. is there. In this case, it is necessary to stop the transportation of the powder once and manually remove the powder blocking the powder passage by manual operation or the like, which is complicated.

[0005] On the other hand, a metal removing apparatus has been proposed in which a vibrator or a knocker is provided on a main body, and vibration or impact is applied to a magnet rod to prevent the powder particles from adhering and accumulating on the surface of the magnet rod. (See Japanese Patent Application Laid-Open No. 8-33855).

[0006]

However, in the method of giving the vibration or shock, there are limitations on the amplitude and cycle of the vibration that can be applied and the magnitude of the shock in terms of the rigidity of the apparatus. In the case of a powder having a large specific volume and a high flow friction resistance, such as vitamin B2 in a needle-like crystal state, or a powder having a high viscosity, the powder is effectively attached and deposited on the surface of the magnet rod. It cannot be prevented, and the bridging causes blockage of the particulate material passage. In addition, due to the application of vibration or impact, there is a possibility that fine iron powder or the like newly peels off and drops off from parts such as bolts and welded parts, and may be mixed into the powder.

Therefore, the present invention effectively prevents the powder particles from adhering and accumulating on the surface of the magnet rod, and is applicable to powder particles having a large specific volume and a high flow friction resistance, or powder particles having a high viscosity. It is another object of the present invention to provide a metal removing apparatus capable of reliably preventing a powder passage from being blocked by a powder and maintaining high metal removal efficiency for a long time.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a body provided with a powder passage through which a powder passes, the powder passage being provided, And a plurality of magnet rods disposed on the main body so as to cross the powder.The metal mixed in the powder passing through the powder passage is magnetically attracted to the powder by the magnet rod. An object of the present invention is to provide a metal removing device for removing a particle from a granular material, the device including a rotation drive mechanism for rotating at least a part of the plurality of magnet rods around an axis thereof.

In the metal removing apparatus of the present invention, since the magnet rod is rotated around the axis by the rotary drive mechanism, even if the specific volume and the flow frictional resistance of the granular material are large or the viscosity is high, the magnet is removed. Adhesion and accumulation of the powder on the rod surface can be effectively prevented. Therefore, as described above, a powder having a large specific volume and a high flow friction resistance,
Even when used for a highly viscous powder, it is possible to prevent the powder passage from being blocked by the powder. Further, since the surface of the magnet bar is maintained in an exposed state without being covered with the powder, high metal removal efficiency can be maintained for a long time. further,
The metal removing device of the present invention prevents powder particles from adhering due to rotation of the magnet bar, and since strong vibration or impact is not applied to the main body or the magnet bar, metal is newly mixed into the powder particles. Can be prevented.

It is preferable that the rotation drive mechanism drives the magnet bar so as to alternately repeat forward and reverse rotations. In this case, it is preferable that the rotation drive mechanism includes a swing actuator that repeats forward and reverse rotations at predetermined time intervals, and a gear mechanism that transmits rotation of the swing actuator to the magnet rod. However, the rotation drive mechanism may rotate the magnet rod continuously or intermittently in a certain direction.

Further, it is preferable that the main body is interposed in an air flow conveying line for conveying the powder by air flow, and that the bottom surface of the powder passage is flat. In this case, the powder that has fallen to the bottom of the powder passage is reliably blown up by the airflow, so that it is possible to prevent the powder from remaining on the bottom. However, the metal removing device of the present invention is not limited to an airflow conveying line, but can be applied to a so-called gravity line that moves powder by gravity.

[0012]

Next, an embodiment of the present invention shown in the drawings will be described. As shown in FIG. 1, a metal removing device 1 according to an embodiment of the present invention is used in a step of subdividing powdered vitamin B2. In this subdivision step, after the vitamin B2 supplied through a hopper 2 from a purification step (not shown) is pulverized into powder in the form of needle crystals by a pulverizer 3, the powder is fed to a filler 5 via a collector 4. The container 6 is conveyed, and is filled into the container 6 by the filling machine 5 at regular intervals. Between the crusher 3 and the collector 4, there is provided an air flow transport line 7 for transporting the powder by an air flow generated by a blower (not shown), and a metal removing device supported by a support table 8. Reference numeral 1 is interposed in the airflow transport line 7 in a posture inclined at about 45 ° with respect to the horizontal direction.

As shown in FIGS. 2 to 5, the metal removing apparatus 1 includes a main body 10, an inlet member 11, an outlet member 12, suction units 13A, 13B, 13C, and a rotation drive mechanism 14.

The main body 10 is a cylindrical body having a U-shaped cross section open at both left and right ends and a front side, and the inside thereof constitutes a powder passage 17 through which the powder passes. The bottom surface 17a of the powder passage 17 is flat.

As shown in FIG. 5, an inflow port 19 and an outflow port 21 are opened at both left and right ends of the main body 10, and flanges 10a and 10b are provided. One end of an inlet member 11 and one end of an outlet member 12 formed of a tapered pipe provided with flanges 11a and 12a are connected to the inflow port 19 and the outflow port 21, respectively. The other ends of the inlet member 11 and the outlet member 12 are provided with flanges 11b and 12b, respectively, so that the pipes 23A and
3B. A connection portion between the main body 10 and the inlet member 11 and the outlet member 12, and a connection portion between the inlet member 11 and the outlet member 12 and the pipes 23A and 23B are not shown in order to secure the hermeticity of the powder passage 17. A seal member is provided. The pipes 23A and 23B may be directly connected to the inflow port 19 and the outflow port 21 of the main body 10 without going through the inlet member 11 and the outlet member 12.

An opening 10c on the front side of the main body 10 shown in FIG.
As shown in FIG. 2, three suction units 13A, 1
3B and 13C are detachably attached.

As shown in FIGS. 4 and 6, the suction unit 13A disposed at the center among the suction units 13A to 13C has a rectangular end plate 25 and an end plate 25A.
One end of which is rotatably supported about their axis N
The magnet bar 27 is provided. These magnet rods 27 have a straight cylindrical shape as a whole. These magnet bars 27 are arranged in a straight line at equal intervals in the longitudinal direction of the end plate 25, and are parallel to each other.

At the base end of the magnet rod 27, a shaft support 27 having a smaller diameter than the main body 27a having a magnetic force of about 10,000 gauss.
The shaft support 27b is rotatably supported by a sleeve 29 screwed to the end plate 25. The shaft support 27b is held by a retaining mechanism (not shown) so as not to come off the sleeve 29.
On the other hand, as shown in FIG. 7, a tapered portion 27c is provided on the tip end side of the magnet rod 27.
c is provided with an engagement groove 27d into which a pin 62 of a rotating shaft 61 described later is inserted. The magnet bar 27
The structure, magnetic force, and the like are not particularly limited, and can be changed according to the type of the granular material, the flow velocity of the airflow transport line 7, and the like.

As shown in FIG. 4, the central suction unit 1
3B shows that the five magnet rods 27 are connected to the powder passage 17.
Is attached to the main body 10 so as to cross the main body 10, and both ends of the end plate 25 are fixed to the main body 10 by the buckles 31. When the suction unit 13B is attached to the main body 10, the tips of the five magnet rods 27 pass through the sleeve 33 attached to the wall 10d on the rear side of the main body 10 and pass from the powder passage 17 to the outside. It protrudes. In addition, seal members (not shown) are disposed on the sleeves 29 and 33 into which the magnet bar 27 is inserted, in order to secure the airtightness in the powder passage 17.

The remaining two suction units 13A and 13C arranged on both sides of the suction unit 13B have the same structure as the suction unit 13B, except that four suction rods 27 are provided. Further, the structure of attaching these suction units 13A and 13C to the main body 10 is the same as that of the suction unit 13B.

As shown in FIG. 2, three suction units 1
In a state where 3A to 13C are attached to the main body 10, the opening 10c on the front side of the main body 10 is closed by the end plates 25 of these suction units 13A to 13C,
The interior of the powder passage 17 is sealed except for the outlet 21.

As shown in FIG. 5, the magnet rods 27 of the three suction units 13A to 13C attached to the main body 10 are arranged in a zigzag manner in the powder passage 17, and are provided by airflow. The powder conveyed in the direction indicated by the arrow A collides with the main body 27a of at least one magnet rod 27 during a period from the inflow port 19 to the outflow port 21.

As shown in FIGS. 3 and 4, a rotary drive mechanism 14 for rotating the magnet rod 27 of each of the suction units 13A to 13C around the axis N is provided on the back side of the main body 10. . The rotation drive mechanism 14 controls the swing actuator 35 and the rotation of the swing actuator 35 by using the magnet rods 2 of the suction units 13A to 13C.
And a gear mechanism 36 for transmitting the power to the transmission mechanism 7.

As shown in FIG. 4, a mounting plate 37 is fixed to the rear wall portion 10d of the main body 10 at an interval, and the swing actuator 35 is fixed to the lower end of the mounting plate 37. Have been.

As shown in FIG. 8, the swing actuator 3
Reference numeral 5 includes a pair of pistons 39A and 39B, and an output shaft 41 provided in a direction orthogonal to the sliding direction of the pistons 39A and 39B. Each piston 39A, 39B
A rack 43 is formed on the side surface of the rack 4.
Reference numeral 3 meshes with a pinion 45 fixed to the output shaft 41. An output gear 46 is fixed to the output shaft 41. Cylinder 4 accommodating each piston 39A, 39B
Air supply ports 49A, 49B communicating with 7A, 47B are
It is connected to an air source 52 via a time delay valve 51.

The time delay valve 51 alternately communicates and shuts off between the air source 52 and the pair of air supply ports 49A and 49B at a cycle according to a signal input from a controller 55 described later. When one air supply port 49A is connected to the air source 52, the corresponding piston 39A moves to the left in FIG. 8, and the linear movement of this piston 39A is caused by the rack 43 and the pinion 45 in the direction of the arrow B1 of the output shaft 41 in the direction of arrow B1. Converted to rotation. Conversely, when the other air supply port 49B is connected to the air source 52, the corresponding piston 39B moves to the left in FIG. 8, and the output shaft 41 rotates in the direction of arrow B2.

A controller 55 is mounted above the main body 10 in the figure via a bracket 53. The time delay valve 51 is connected to the power supply 57 via the controller 55. The controller 55 includes a switch 55a for controlling ON / OFF of the time delay valve 51, and a switch 55b for adjusting a switching cycle of the time delay valve 51 in a range of 1.0 to 60 seconds.

Next, the gear mechanism 36 will be described. As shown in FIG. 4, sleeves 59 are fixed to the mounting plate 37 at positions corresponding to the tips of the magnet bars 27, respectively. A rotating shaft 61 is rotatably supported. Each rotating shaft 61 is held by a retaining mechanism (not shown) so as not to come off from the sleeve 59.

As shown in FIGS. 4 and 7, a tapered recess 61a is provided at one end of each rotating shaft 61, and a pin 62 is fixed in the recess 61a. When each of the suction units 13A to 13C is attached to the main body 10, the tapered portion 27c at the tip of each magnet bar 27 is inserted into the corresponding concave portion 61a of the rotating shaft 61, and the pin 62 is inserted into the engaging groove 27d of the tapered portion 27c. You. Each magnet bar 27 is detachably connected to the corresponding rotation shaft 61 by a connection mechanism including the engagement groove 27d on the magnet bar 27 side and the pin 62 on the rotation shaft 61 side.

On the other hand, a small diameter gear 63 is fixed to the other end of each rotating shaft 61 as shown in FIGS. As shown in FIG. 3, each small-diameter gear 63 is meshed with a small-diameter gear 63 adjacent in the vertical direction in the figure.
Thus, three gear trains each including five, four, and four small-diameter gears 63 are configured. These three gear trains correspond to the suction units 13A to 13C, respectively.

A large diameter gear 65 in addition to the small diameter gear 63 is fixed to the lowermost three rotating shafts 61 of each gear train. Of the three large-diameter gears 65, the large-diameter gear 65 located at the center in FIG. 3 is engaged with two large-diameter gears 65 located on both sides thereof. The large-diameter gear 65 located at the center is connected to the swing actuator 3.
5 is meshed with an output gear 46 fixed to the output shaft 41.

In the gear mechanism 36 having the above structure, the rotation of the output shaft 41 of the swing actuator 35 is controlled by the output gear 46.
To the three large-diameter gears 65, and further transmitted to the individual rotating shafts 61 by the small-diameter gear 63. The rotation of each rotation shaft 61 is transmitted to each magnet bar 27 by a coupling mechanism including the engagement groove 27d and the pin 62.

In this embodiment, the gear ratio between the small-diameter gear 63 and the large-diameter gear 65 and the gear ratio between the large-diameter gear 65 and the output gear 46 are set such that each time the swing actuator 35 rotates in the directions of arrows B1 and B2. The magnet rod 27 is set so as to rotate forward or backward by 90 °, but the rotation angle of the magnet rod 27 at one time is not limited to this. May be set as appropriate in accordance with the flow velocity and the like.

Next, the operation of the metal removing apparatus 1 having the above configuration will be described. Switch 55 of controller 55
When a is turned on, the time delay valve 51 is operated, and the swing actuator 3 is turned on at a cycle set by the switch 55b.
5 alternately rotates in the directions of arrows B1 and B2. The output shaft 41 rotates from the output gear 46 to the large diameter gear 6.
5, transmitted to the magnet bars 27 of the suction units 13A to 13C via the small-diameter gear 63 and the rotating shaft 61, and each magnet bar 27 is moved around the axis N by arrows C1 and C2.
Repeat rotation in the direction.

For example, when the output shaft 41 of the swing actuator 35 rotates in the direction indicated by the arrow B1 in FIG.
The magnet bar 27 of each of the suction units 13A to 13C rotates in a direction indicated by an arrow C1 in FIG. On the other hand, the rotation shaft 61 of the swing actuator 35 is indicated by an arrow B in FIG.
When rotated in the direction indicated by 2, each of the suction units 13A to 13A-1
The rotation direction of the 3C magnet bar 27 is also reversed, and rotates in the direction indicated by the arrow C2 in FIG.

The powder conveyed through the air flow conveying line 7 flows from the inlet 19 into the powder passage 17 of the metal removing device 1 as shown by an arrow A in FIG. leak. And, from the inlet 19 to the outlet 21
Before reaching at least one magnet rod 17. At this time, if a metal such as an iron piece or fine iron powder is mixed in the powder, it is magnetically adsorbed on the surface of the magnet rod 27 and is removed from the powder.

As described above, since the respective magnet rods 27 are repeatedly rotated in the directions of arrows C1 and C2, it is possible to effectively prevent the particles colliding with the respective magnet rods 27 from adhering. Therefore, the magnet rod 2
The powder particles do not accumulate on the surface of the powder 7, and the blocking of the powder particle passage 17 due to the bridging of the powder particles can be prevented. In addition, since the surface of the magnet bar 27 is maintained in an exposed state without being covered with the powder, high metal removal efficiency can be maintained for a long time.

According to the experiments conducted by the present inventors, it was found that the powdery vitamin B had a large specific volume and a high flow frictional resistance, and was in the form of acicular crystals.
In the case of 2, the method of applying vibration or impact to the magnet rod cannot effectively prevent the adhesion of the powder to the magnet rod, and the passage of the powder is blocked by the bridging powder. However, in the case of the metal removing apparatus 1 of the present embodiment, no bridging occurred and the particulate material flow path 17 was not closed.

Further, since the metal removing apparatus 1 of this embodiment does not apply vibration or impact to the main body 10 or the magnet rod 27, iron pieces and fine iron powder are newly peeled and dropped from welding parts and the like. It is possible to prevent the particles from being mixed into the powder.

Further, in the metal removing apparatus 1 of the present embodiment, as described above, the bottom surface 17 of the powder passage 17 of the main body 10 is formed.
Since a is flat, even if the powder falls to the bottom surface 17a, it is surely blown up toward the outlet 21 by the airflow of the airflow transport line 7, and the powder does not stay on the bottom 17a.

In order to remove the metal adsorbed on the surface of the magnet rod 27, the air current transfer line 7 is stopped and the rotary drive mechanism 14 is stopped. Then, the buckle 31 is removed, and as shown in FIG. 13C may be removed from the main body 10 and the surface of the magnet bar 27 may be cleaned.

In this embodiment, the main body 1 of the metal removing device 1
0, but the power supply 57,
The controller 55, the time delay valve 51, and the air source 52 may be provided separately from the main body 10. In this case, only a tube for supplying air pressure from the time delay valve 51 to the swing actuator 35 is connected to the main body 10 of the metal removing device 1, and there is no need to wire an electric wire around the main body 10. Therefore, with such a configuration, if it is necessary to remove metal from the powder in a place where it is necessary to avoid fire, etc., it is necessary to install only the main body 10 in that place and safely remove the metal. Can be.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, only a part of the plurality of magnet bars may be driven to rotate, and the remaining magnet bars may not rotate.

Further, the rotation drive mechanism may be a mechanism that converts rotation in one direction, such as an electric motor, an air motor, or a hydraulic motor, into forward or reverse rotation by a crank mechanism, a cam mechanism, or the like. The rotation drive mechanism may rotate the magnet rod continuously or intermittently in a certain direction. Further, the posture in which the main body is disposed is not particularly limited, and the main body may be disposed in a horizontal direction or in a vertical direction. Furthermore, the metal removing apparatus of the present invention can also be used in a so-called gravity line in which the powder is moved by gravity, for example, at a place where the powder is dropped from a hopper to various devices.

The powders from which the metal can be removed by the metal removing apparatus of the present invention are not limited to the above-mentioned needle-shaped crystalline vitamin B2, and include grains, processed cereals, sweeteners, and the like in the field of food industry. It can be used to remove metals from particulates such as food additives except oily substances, additives listed in the Pharmacopoeia, processed foods, and raw materials in the fields of chemical industry, chemical industry, ceramic industry, mining industry, etc. it can.

The cereals include beans, sesame, peanuts, barley, wheat, rice, potato, sweet potato, corn and the like. The processed cereals include polished rice, rice flour, flour, soybean powder, wheat starch, potato starch, corn starch, sweet potato starch and the like. The above-mentioned sweeteners include sugar, glucose, fructose, lactose, maltose, maltitol, sorbitol, mannose, xylose, lactitol, trehalose and the like. In addition, the processed foods include powdered or granular cake mix, mashed potato, powdered miso, powdered soy sauce, powdered meat extract, powdered vegetable extract, powdered fruit extract, dried vegetable flakes, dried mushroom flakes, dried meat flakes, dried Egg powder, skim milk powder, milk powder for childcare, instant jelly mix powder, green tea, oolong tea, tea such as black tea, coffee, cocoa,
Includes seasonings and the like.

[0047]

As is apparent from the above description, in the metal removing apparatus of the present invention, since the rotary drive mechanism rotates the magnet rod provided so as to traverse the powder passage around the axis, the powder is removed. Even when the specific volume and the flow friction resistance of the body are large or the viscosity is high, it is possible to effectively prevent the powder material from adhering and accumulating on the surface of the magnet rod. Therefore, even when used for a fluid having a large specific volume and a high flow friction resistance or a powder having a high viscosity, it is necessary to surely prevent the passage of the powder from being blocked by bridging of the powder. Can be. In addition, since the surface of the magnet bar is maintained in an exposed state without being covered with the powder, high metal removal efficiency can be maintained for a long time. Furthermore, the metal removing device of the present invention prevents the powder particles from adhering due to the rotation of the magnet rod. Since strong impact or vibration is not applied to the main body or the magnet rod, metal is newly mixed into the powder particles. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a subdivision step of vitamin B2 provided with a metal removing device according to an embodiment of the present invention.

FIG. 2 is a front view showing a metal removing device.

FIG. 3 is a rear view showing the metal removing device.

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2 showing the metal removing device.

FIG. 5 is a longitudinal sectional view showing a metal removing device.

FIG. 6 is a perspective view showing a suction unit.

FIG. 7 is a partially enlarged exploded perspective view showing a connection structure between a magnet rod and a rotating shaft.

FIG. 8A is a sectional view showing a swing actuator,
(B) is a sectional view taken along line VIII-VIII of (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal removal apparatus 2 Hopper 3 Crusher 4 Collector 5 Filling machine 6 Container 7 Air flow conveyance line 10 Main body 10c Opening 11 Inlet member 12 Outlet member 13A, 13B, 13C Suction unit 14 Rotary drive mechanism 17 Powder passage 17a Bottom surface DESCRIPTION OF SYMBOLS 19 Inflow port 21 Outflow port 25 End plate 27 Magnet bar 27a Main body 27b Shaft support 27c Taper 27d Engagement groove 29, 33, 59 Sleeve 31 Buckle 35 Swing actuator 36 Gear mechanism 37 Mounting plate 46 Output gear 51 Time delay valve 52 Air source 55 Controller 55a, 55b Switch 57 Power supply 61 Rotary shaft 62 Pin 63 Small diameter gear 65 Large diameter gear N Axis

Claims (5)

[Claims] A body provided with a powder passage through which the powder passes, and a plurality of magnets disposed in the body so as to traverse the powder passage. A metal removing device comprising: a rod; and a metal mixed in the powder passing through the powder passage, and magnetically adsorbed by the magnet rod to remove the metal from the powder. A metal removing device provided with a rotation drive mechanism for rotating at least a part of the rotation about its axis. 2. The metal removing device according to claim 1, wherein the rotation drive mechanism drives the magnet bar so as to alternately repeat forward and reverse rotations. 3. The metal according to claim 2, wherein the rotation drive mechanism includes a swing actuator that repeats forward and reverse rotations at predetermined time intervals, and a gear mechanism that transmits rotation of the swing actuator to the magnet rod. Removal device. 4. The metal removing device according to claim 1, wherein the rotation drive mechanism drives the magnet bar to rotate in a fixed direction. 5. The method according to claim 1, wherein the main body is interposed in an air flow conveying line for conveying the powder by air flow, and a bottom surface of the powder passage is flat.
The metal removing device according to any one of the above.