JPS5940323Y2 - electromagnetic suction device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic lifting device for conveying magnetic materials such as steel plates, and particularly relates to an electromagnetic lifting device that is provided in a conveying line for sorting and can be freely excited and demagnetized.

Conventionally, an electromagnetic suction roller installed on a conveyance line for sorting magnetic materials consists of a rotatable non-magnetic roller 1 and a magnetic yoke 3 supported by a fixed shaft 2 fixed thereto, as explained in FIGS. 1 and 2. A magnetic core 5 having a magnetic pole 4 protruding from the inner surface of the roller 1 is provided on the magnetic yoke 3, and an external resistor 7 is connected to an excitation coil 6 provided on the outer periphery of the magnetic core 5. The idea was to reduce the delay in the current flowing through the excitation coil 6 when excitation and demagnetization of the rollers, thereby improving the sorting performance.

However, even if countermeasures are taken against the delay in the current of the excitation coil, there is a delay in excitation/demagnetization switching operation due to the residual magnetic lift of the magnetic yoke 3, magnetic core 5, and magnetic pole 4, which is a disadvantage of impeding speedy sorting of magnetic conveyed objects. was there.

In view of the above-mentioned drawbacks, the object of this invention is to provide an electromagnetic lifting device that switches between excitation and demagnetization more quickly.

The configuration of an embodiment of this invention will be explained based on the drawings.

FIG. 3 shows the front half of this embodiment developed. The right half of FIG. 4 is a cross section taken along the line B-B in FIG.
C section is shown, and members common to those in FIG. 1 are given the same reference numerals and explanations are omitted.

In FIGS. 3 and 4, a thin yoke 8 fixed to the fixed shaft 2 is provided in the non-magnetic roller 1.

The base of the core 10 is fixed to the support surface of the yoke 8 with an insulating plate 9 made of glass fiber or the like interposed therebetween.

The core 10 is made of laminated thin plates such as insulated silicon steel plates, which have low coercive force and high magnetic permeability, and whose surfaces are insulated. 12, and projecting protrusions m to abut each other on both sides of the base.

A non-magnetic band 13 is hung over the protrusion m of the core 10 and fixed to the yoke 8 by fastening means.

The pole piece 12 is adjacent along the inner surface of the non-magnetic roller 1.

The operation of the above configuration will be described next.

The yoke 8 has a core 10 and a magnetic pole 1 inside a rotatable roller 1.
2 and the excitation coil 11.

The excitation coil 11 is energized to excite the core 10 and the magnetic pole 12
The magnetic conveyed object is absorbed onto the outer surface of the roller 1 facing the roller 1.

The silicon steel plate laminated core 10 increases magnetic permeability and reduces the delay when switching between excitation and demagnetization.

If there is a gap between the protrusions m of the core 10, the resistance of the magnetic circuit increases (the magnetic flux density decreases), so in order to reduce this resistance, the protrusions m of the core are joined together.

The glass fiber insulating plate 9 electrically and magnetically insulates the yoke 8 and the core 10, thereby suppressing interference with the excitation/demagnetization switching action of the core 10 and the coil 11.

The magnetic pole piece 12 also serves as a clamp for the laminated pieces of the core 10.

The nonmagnetic band 13 fixes the core 10, the coil 11, and the magnetic pole piece 12 to the yoke 8.

As explained above, in this invention, the core of the excitation coil is composed of a stack of highly permeable plates with small coercive force, and is fixed to the yoke via an electromagnetic insulating material, which delays the excitation and demagnetization of the core itself. Since the influence of the yoke is suppressed by using an insulating material, it is possible to obtain an electromagnetic roller that can quickly switch between excitation and demagnetization.

[Brief explanation of the drawing]

Figure 1 is a diagram of a conventional example, Figure 2 is a sectional view taken along line A-A in Figure 1,
Figure 3 is an exploded view of the front half of the embodiment of the present invention;
The right half of the figure is a section B-B diagram, and the left half is a section C-0 diagram. 1: Roller, 8: Yoke, 9: Insulating plate, 10: Core, 1
3: Non-magnetic band.

Claims (1)

[Scope of utility model registration request] Sorting is carried out using an electromagnetic lifting device that can be freely excited and demagnetized, which is installed on the conveyor line. A fixed yoke is installed inside a rotatable non-magnetic roller, and magnetic plates with low coercive force and high magnetic permeability are laminated and placed on both sides. A plurality of cores each consisting of a base having a protrusion, a body surrounded by an excitation coil, and a head connected to a magnetic pole piece are connected along the longitudinal direction of the fixed yoke by bringing the protrusions into contact with each other. At the same time, the base of the core is fixed to the fixed yoke via an electromagnetic insulating plate, and a non-magnetic band is hung over the protrusion of the core, and the end of the non-magnetic band is fixed to the fixed yoke via the electromagnetic insulating plate. An electromagnetic board lifting device characterized by being fixed to a fixed yoke.