JP6145363B2 - Electromagnetic separator screen - Google Patents

Description

  The present invention relates to a screen for an electromagnetic separator used in an electromagnetic separator that separates and removes magnetized foreign matter (hereinafter referred to as “magnetic foreign matter”) such as iron powder contained in powder. .

  In the fields of food, chemistry, medicine, etc., electromagnetic separators are used to remove magnetic foreign substances from powders. In the electromagnetic separator, a screen made of a plate-like magnetic material is stacked in a vertical direction on a screen holding rod in a cylinder. After the screen is magnetized by the electromagnetic action of an electromagnet, powder is supplied from the opening at the top of the cylinder. After that, the screen is demagnetized to remove the magnetic foreign matter and separate it (see Patent Document 1).

  In the electromagnetic separator using the screen shown in FIG. 5, a screen 22 made of a magnetic material is detachably held in a multilayer manner on a holding rod 27 in a cylinder 21 whose upper and lower ends are open. Protrusions 23 are provided on the outer periphery of the cylinder 21 at a required interval, and the electromagnet 24 is attached via a spring 25 so as to surround the outer periphery of the cylinder 21 between both the protrusion edges 23 and hold a small gap therebetween. A vibrator 26 is attached to the lower part of the tube 21.

  In the electromagnetic separator, when the vibrator 26 is started to vibrate the cylinder 21 and energization of the electromagnet 24 is started, each screen 22 in the cylinder is a magnetic material and is located in the magnetic field of the electromagnet 24. To be magnetized. Therefore, if powder is introduced from the upper end opening of the cylinder 21, the powder falls while passing through the screens 22 sequentially from above while being diffused in the cylinder by the action of vibration, and the magnetic foreign matter is magnetized during this time. The powder that is adsorbed and retained by each screen 22 and from which the magnetic foreign matter has been removed is led out from the lower end opening of the cylinder 21. When the separation operation for a certain amount or a certain time is finished, the supply of the powder is stopped and the electromagnet and the vibrator are turned off. Then, hold the upper end of the holding rod 27 holding the screen 22 and pull it upward. Since all of the screen 22 is held by the holding rod 27, all the screens 22 are taken out from the inside of the tube 21 together with the holding rod 27. The removed screen 22 is cleaned to remove magnetic foreign matters. The cleaned screen 22 is returned to the inside of the cylinder 21 again, and the powder is supplied to start the magnetic foreign matter removing operation.

  In the conventional screen shown in FIG. 6, linear grades 28 made of a magnetic material are arranged at intervals and fixed to a support member 29 to form a scissors shape, and an annular through portion 30 through which a holding rod is passed in the center. Is formed. Here, when the grate 28 is welded and fixed to the support member 29 by TIG welding, it is difficult to extend the tungsten electrode to a narrow and deep welding location and sufficiently blow out argon. A range of 5-20 mm from the upper limit is common.

  However, the above-mentioned scissors-like screen has a linear area between the linear grades that cannot be made as narrow as less than 5 mm from the manufacturing limit as described above. In addition, since there is a gap on the outer periphery of the screen, there is a powder that allows the magnetic foreign matter to pass through without being magnetized, so that there is a problem that the removal rate of the magnetic foreign matter is low.

  Therefore, the applicant of the present application has increased the area where the magnetic foreign matter is magnetically attached and reduces the powder that passes without being magnetically attached to the outer periphery of the screen, thereby improving the removal rate of the magnetic foreign matter. (See Patent Document 2).

  As shown in FIGS. 7 and 8, the honeycomb-shaped electromagnetic separator screen described in Patent Document 2 has an annular through-hole 33 through which a holding rod for holding the screen 31 passes in the center of the electromagnetic separator screen 31. A ring frame 32 is formed on the outer side, and a spiral plate 34 spirally wound in the ring frame 32 at an interval toward the penetrating portion, and a corrugated corrugated plate 35 is disposed in the gap between the spiral plates 34. Then, the valleys and peaks of the corrugated plate 35 are fixed to the spiral plate 34 and formed in a honeycomb shape.

Japanese Utility Model Publication No. 50-32863 JP 2011-143346 A

  As described above, the cocoon-like screen has a large width with a grade interval of 5 mm or more, and there are also powders that are open around the screen so that the magnetic foreign matter passes through without being magnetized. There has been a problem that the removal rate of the is reduced.

  The honeycomb-shaped screen has a closed shape where the corrugated corrugated valleys and peaks arranged between the spiral plates and the fixed portion of the spiral plate are tapered and closed, so that magnetic foreign substances and There was a problem that the recovery rate was reduced because the powder was clogged in the fixed part. In addition, the above-described corrugated corrugated corrugated valley and mountain and spiral plate fixing parts are not all fixed by welding, and some of them are in contact with each other without being welded. There is also a problem that foreign matter is generated by rubbing or clogging occurs due to the foreign matter.

  Therefore, the present invention narrows the interval through which the powder passes and reliably magnetically adheres the magnetic foreign matter, increases the magnetic adhesion area where the magnetic foreign matter is magnetically attached, and prevents clogging of the powder and magnetic foreign matter. A screen for an electromagnetic separator is provided.

The invention of claim 1 of the present application relates to a screen for an electromagnetic separator used in an electromagnetic separator that magnetically separates and separates magnetic foreign substances contained in powder, and is fixed to the ring-shaped ring frame and the ring frame. The wedge wire screen is formed by electrical resistance welding at the intersection of the wedge-shaped tip of the wedge wire whose wedge section is wedge-shaped and the support rod, and holds the screen for the electromagnetic separator in the center. through portions of the annular retaining rods passes is formed, the wedge wire the ends of the wedge wire screen without contact with the ring frame, the ends of each support rod of the previous SL ring frame A screen for an electromagnetic separator, wherein the screen is fixed to a lower surface of a flange provided on the periphery, and welding is used as the means .

The invention the claims 2, electromagnetic separator screen as claimed in claim 1, the gap portion is positioned below the lower surface of the flange between the front SL and end of each wedge wire said ring frame.

The invention according to claim 3 of the present application is the electromagnetic separator screen according to claim 1 or 2 , wherein the interval between the wedge wires is less than 5 mm.

  In the screen for an electromagnetic separator according to the present invention, the wedge wire screen is formed by electrically resistance-welding all the intersections of the wedge-shaped pointed portion of the wedge wire with a wedge-shaped longitudinal section and the support rod. According to the electric resistance welding, since the current can be passed through the welding point without using the tungsten electrode as in the TIG welding, the interval between the screens (wedge wires) can be narrowed. As a result, magnetic foreign substances can be reliably magnetized, and the number of wedge wires can be increased to increase the magnetic adhesion area of the magnetic foreign substances. In addition, since all the intersections of the wedge-shaped point of the wedge wire and the support rod are electrically resistance welded, the wedge wire and the support rod do not rub against each other, and foreign matter is generated or clogged by the foreign matter. Can be prevented.

  Furthermore, the end of the wedge wire is separated from the ring frame, and the end of the support rod is welded to the lower surface of the flange provided on the inner periphery of the ring frame, so that the gap between the end of each wedge wire and the ring frame is If the portion is positioned below the lower surface of the flange, the gap portion is covered with the lower surface of the flange, so that foreign matter is less likely to enter the gap portion, and the foreign matter may cause clogging or the like. It can be prevented from occurring.

It is a reverse view of the screen for electromagnetic separators of this invention. It is a top view of the screen for electromagnetic separators of this invention. It is AA sectional drawing of FIG. It is a schematic diagram which shows the state which set the screen for electromagnetic separators of this invention to the electromagnetic separator. It is the schematic which shows the conventional electromagnetic separator only for powder. It is a schematic diagram which shows the conventional screen. It is a top view of the screen for the conventional electromagnetic separator. It is sectional drawing of the screen for electromagnetic separators of FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  1 to 3, an electromagnetic separator screen (hereinafter referred to as “screen”) 1 is made of a magnetic material magnetized by an electromagnet. The magnetic material is not particularly limited as long as it is magnetized, but stainless steel having excellent corrosion resistance and strength is suitable.

  The screen 1 includes an annular ring frame 2 and a wedge wire screen 3 fixed in the ring frame.

  The outer diameter of the ring frame 2 is, for example, about 30 cm. A flange 4 projecting inward is formed on the periphery of the ring frame 2, and the end of the support rod 5 of the wedge wire screen 3 is welded to the lower surface of the flange 4. And fixedly supported.

  The wedge wire screen 3 includes a support rod 5 and a wedge wire 6 having a wedge-shaped cross section arranged in a lattice shape perpendicular to the support rod 5, and an electric resistance welding is performed at the intersection of the wedge-shaped tip of the wedge wire 6 and the support rod 5. Thus, a narrow slit is formed between the wedge wires 6.

  Before the wedge wire screen 3 is fixed to the flange 4 of the ring frame 2, the intersection of the wedge wire and the support rod is prepared as a grid-like screen by electric resistance welding, and this screen is fitted to the ring frame 2. After forming into a shape, a support rod 5 is welded and fixed to the lower surface of the flange 4 of the ring frame 2.

  The wedge wire screen 3 produced by electric resistance welding of the wedge wire 6 having a wedge-shaped cross section forms a narrow slit of less than 5 mm in which the slit width of each wedge wire 6 is smaller than the slit width of the conventional scissors type screen. It is possible to increase the number of wedge wires and increase the magnetized area. Further, since the slit width is narrow, it is possible to prevent the magnetic foreign matter from passing without being magnetized.

  At the center of the screen 1, an annular support ring 7 through which a holding rod (FIGS. 4 and 5) for supporting the screen 1 passes is formed. Like the ring frame 2, the support ring 7 is formed with a flange 8 projecting outward in an L shape on the periphery of the support ring 7, and the end of the support rod 5 of the wedge wire screen 3 is formed on the lower surface of the flange 8. Welded and fixed.

  The end portion of the wedge wire 6 is not welded to the flange of the ring frame 2 and the support ring 7, and the powder is clogged by keeping a space for the passage (gap portion) of the powder at an interval. Is preventing. In addition, since the screen 1 is used while continuously receiving a high magnetic field and vibration inside the tube 14, even if the ring frame 2, the support ring 7, and the support rod 5 are fixed by welding, a slight amount is required. Since there is a possibility of causing deformation, if at least a gap of about 1 mm is formed, it is possible to prevent wear powder from being generated due to contact between metals.

  FIG. 4 shows a state in which the screen 1 of the present invention is set in an electromagnetic separator. Similar to the electromagnetic separator shown in FIG. 5, the magnetic material is formed in the hollow portion of the cylinder 14 whose upper and lower ends are open. A plurality of screens 1 are held by a holding bar 15 in multiple layers in the vertical direction. The cylinder 14 is disposed at the center of the electromagnet 16, and the vibrator 9 is attached to the lower part of the cylinder 14.

  A product discharge port 10 and a magnetic foreign material discharge port 11 are connected to the lower portion of the tube 14. The product discharge port 10 and the magnetic foreign material discharge port 11 are switched by rotating a damper 13 with a cylinder 12.

  In FIG. 4, the powder containing the magnetic foreign material supplied from the upper part of the cylinder 14 is magnetically attached to the screen 1 which is stacked in multiple layers and magnetized by the electromagnet 16. The product from which the magnetic foreign matter has been removed passes through the screen 1 and is then discharged from the product discharge port 10 by the damper 13. When the processing for a predetermined amount or a predetermined time is completed, the damper 13 is switched to the magnetic foreign matter discharge port 11, the electromagnet 16 is turned off to demagnetize the screen 1, and the magnetic foreign matter adhering to the screen 1 is vibrated by the vibration of the vibrator 9. Remove. If necessary, the screen 1 is taken out by the holding rod 15 and cleaned to remove the magnetic foreign matter. The cleaned screen 1 is again inserted into the cylinder 14 and the magnetic foreign matter separation operation is started.

1: Screen 2: Ring frame 3: Wedge wire screen 4: Flange 5: Support rod 6: Wedge wire 7: Support ring 8: Flange 9: Vibrator 10: Product discharge port 11: Magnetic foreign matter discharge port 12: Cylinder 13: Damper 14: Tube 15: Holding rod 16: Electromagnet 21: Tube 22: Screen 23: Projection edge 24: Electromagnet 25: Spring 26: Vibrator 27: Holding rod 28: Grade 29: Support member 30: Penetration part 31: Screen 32: Ring Frame 33: penetration part 34: spiral plate 35: corrugated plate

Claims (3)

In the electromagnetic separator screen used for the electromagnetic separator that magnetically adheres and separates the magnetic foreign matter contained in the powder,
It consists of a ring-shaped ring frame and a wedge wire screen fixed in the ring frame,
The wedge wire screen is formed by electrically welding all the intersections of the wedge-shaped tip of the wedge wire whose longitudinal cross-sectional shape is a wedge shape and the support rod, and a ring in which a holding rod for holding the electromagnetic separator screen passes through the center. A penetration is formed,
The wedge wire the ends of the wedge wire screen without contact with the ring frame, the ends of each support rod is fixed to the lower surface of the flange provided on the inner periphery of the front Symbol Ring frame, as a means A screen for an electromagnetic separator, characterized by using welding. Before Symbol electromagnetic separator screen as claimed in claim 1, the gap portion is positioned below the lower surface of the flange between the end and the ring frame of each wedge wire.   The screen for an electromagnetic separator according to claim 1 or 2, wherein an interval between the wedge wires is less than 5 mm.

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