KR100406432B1 - A coil lifter using a permanent magnet - Google Patents

Abstract

The present invention relates to a device for winding a coil using a permanent magnet.

The present invention has a pair of left and right pole members (12) for focusing the magnetic force lines by mounting the adapter 11, the front surface is in close contact with the outer surface of the steel sheet coil (M), and the pull member 12 A plurality of fixed permanent magnets 13 attached to surround the outer surface to generate the main magnetic force lines, and a plurality of fixed permanent magnets 14 attached to the lower surface of the pole member 12 to generate the magnetic force lines 14 It is wound around, and accommodates the electric coil 15 and the pole member 12, fixed, variable permanent magnets 13, 14 for inverting the magnetization direction according to the current flow supply direction to adjust the adsorption, desorption force, Including permanent box having a magnetic force and smooth magnetic force, the magnet has a permanent magnet with a high magnetic permeability and a pole and yoke of a soft magnetic material. Strong adsorption force generated by appropriately concentrating magnetic flux The effect of the water can, and a simple steel coils having a curved outer surface and a magnetic force, transferred safely lifted is obtained.

Description

Coil hoist using permanent magnet {A COIL LIFTER USING A PERMANENT MAGNET}

The present invention relates to a device for hoisting a coil using a permanent magnet, and more particularly, in a permanent permanent magnet by combining a pole and a yoke of a soft magnetic material having a high magnetization force and a high magnetic permeability. The present invention relates to a coil hoist using a permanent magnet which is a heavy material with strong adsorption force generated by appropriately concentrating generated magnetic flux and a steel plate coil having a curved outer surface can be easily and safely lifted and transported as a magnetic force.

In general, a lifter used to lift or lower a heavy object by hanging on a hook of a crane (not shown) is an essential transport equipment that has been used for a long time in steel-related steel works and steel manufacturing sites.

Conventionally, the method of hoisting and transporting a heavy product, which is a steel product, using a magnetic force of an electromagnet forms the mainstream, but a hoist using an electromagnet has the following disadvantages.

1) The weight of the electromagnet hoist itself is excessively heavy, so the capacity of the crane to lift the hoist itself should be large at the same time. 2) The electric energy that was being energized during hoisting work because the heavy object was hoisted by using the electromagnetic force generated when the power was applied. Will cause huge safety accidents, 3) short-term maintenance must be followed to prevent safety accidents, and 4) maintenance and electrical energy must be supplied at a constant and stable level. There was an issue that was overdone.

On the other hand, the permanent magnet hoisting machine capable of efficiently compensating the above-mentioned disadvantages efficiently and having the same hoisting ability, has the following advantages.

(1) Power supply is not necessary during the work of moving the heavy object by lifting it by magnetic force, (2) Its own weight is lighter than the lifting force by which heavy object is recommended, and (3) It needs almost maintenance and repair compared to the electromagnetic hoist. It can be used for a long time without (4) there is no risk of falling weight lifting weight even if the supply of electric energy is stopped by power failure.

Permanent magnet hoisters with this advantage have been in use since the 1980s. By using two types of permanent magnets (fixed permanent magnets and variable permanent magnets), it is possible to design a pole that is in direct contact with the object to be hoisted. A hoist that exhibits adsorption capacity has been fabricated and used on the job site (Michele Cardone et al., "Magnetic anchoring apparatus with quadrant pole arrangement", US Patent 4,507,635, 1985 and Magnetic gripping apparatus, US Patent 4,847,582, 1989).

In recent years, a hoist using this permanent magnet has been invented in Korea and used in the field. (Korean Patent Application No. 1995-68485)

However, such a conventional hoist is formed so that its use is restricted when the shape of the weight to be hoisted is a flat plate, so that the cold rolled or hot rolled steel sheet has a curved surface, such as a rolled steel coil. Difficulties in lifting heavy objects have been limited and their use has been limited to flat plates such as slabs.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of which is that the steel sheet is wound in a roll form, such as a steel sheet coil having a curved outer surface easily and safely as a magnetic force of the permanent magnet To provide a coil hoist using a permanent magnet that can be wound.

Figure 1 (a) (b) (c) is an exploded and assembled perspective view showing a coil hoist using a permanent magnet according to the present invention,

Figure 2 (a) (b) (c) is a cross-sectional view and a plan view showing a coil hoist using a permanent magnet according to the present invention,

Figure 3 (a) (b) is a front view, a perspective view showing an adapter employed in the coil hoist using a permanent magnet according to the present invention,

Figure 4 (a) (b) (c) (d) is an operating state diagram showing the direction of the magnetic line of the permanent, variable permanent magnet employed in the coil hoist using a permanent magnet according to the present invention,

5 is a state diagram showing a coil hoist using a permanent magnet according to the present invention.

Explanation of symbols on the main parts of the drawings

11 .... Adapter 12 .... Pole member

13 .... Fixed permanent magnets 14 .... Variable permanent magnets

15 .... Electric Coil 15 .... Square Case

17 .... fixing bolt member M ..... rolled steel coil

As a technical configuration for achieving the above object, the present invention

In the hoisting machine used by being mounted on a crane so as to hoist a heavy object such as a rolled steel sheet coil by magnetic force,

A pair of left and right pole members for focusing magnetic force lines by mounting an adapter in which the front surface is in close contact with the outer surface of the steel sheet coil;

A plurality of fixed permanent magnets attached to surround the outer surface of the pull member to generate a main force line;

An electric coil attached to the lower surface of the pole member and wound on the outer surface of the variable permanent magnet to generate a magnetic force line, and inverted in the magnetization direction according to the current flow supply direction to adjust the adsorption / desorption force;

The pole member, the fixed, the variable permanent magnet is accommodated, and by providing a coil hoist using a permanent magnet, characterized in that it comprises a rectangular case that acts as a magnetic force line to move smoothly.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figure 1 (a) (b) (c) is an exploded and assembled perspective view showing a coil hoist using a permanent magnet according to the present invention, Figure 2 (a) (b) (c) is a permanent magnet according to the present invention 3A and 3B are cross-sectional views and a plan view of the coil winding machine used, and a front view and a perspective view of the adapter employed in the coil winding machine using the permanent magnet according to the present invention. (c) (d) is an operation state diagram showing the direction of the magnetic force line of the permanent, variable permanent magnet employed in the coil hoist using a permanent magnet according to the present invention, Figure 5 is a coil hoist using a permanent magnet according to the present invention The use state diagram shown.

1 to 5, the coil hoist 1 of the present invention is equipped with a crane so as to absorb and transport a heavy object such as a roll coil having a curved outer surface in the form of a roll shape as a magnetic force of a permanent magnet. As such, the hoist 1 is composed of a pole member 12, a permanent, variable permanent magnet 13, 14 and the electric coil 15, a rectangular case 16 and the like.

In other words, the pole member 12 is equipped with a pair of left and right to mount the adapter 11, the front surface is in close contact with the upper surface to the steel plate coil made of a curved outer surface, such as a rolled steel sheet coil to be wound The adapter 11 and the pole member 12 have a high permeability, a very high saturation magnetization value, and are preferably made of ultra low carbon steel having a carbon content of 0.03 wt.% Or less.

In addition, the adapter 11 mounted on each upper surface of the pawl member 12 is configured in an arc shape so as to evenly transmit a magnetic force line in contact with the outer surface of the curved weight. The adapter 11 and the pawl member 12 The body of the screw hole (11a) is formed so that the fixing bolt member 17 can pass through.

In addition, the fixed permanent magnet (13) is a magnet member that is attached to surround the outer surface of the pull member 12 made of a rectangular parallelepiped to generate a main magnetic force line, the fixed permanent magnet (13) has a unique coercive force (iHc) of 8 It is preferable to use Nd2Fe14B and SmCo5, which are rare earth permanent magnets having a range of -15 kOe and a residual magnetic flux density (Br) of 8 to 12 kG and exhibiting strong coercive force and current magnetic flux density.

And, the lower surface of the pole member 12 is equipped with a variable permanent magnet 14 for generating a line of magnetic force, the fixing bolt member 17 penetrating the adapter 11 and the pole member 12 in the body The through hole is formed through a plurality of threaded holes (14a), the variable permanent magnet 14 has a coercive force (Hc) of 700 ~ 1500 Oe range, residual magnetic flux density (Br) of 10 ~ 12 kG range, the current magnetization The density is considerably high, but the coercive force is small, and is preferably composed of an Alnico magnet, in which magnetization is easily reversed by an electric coil wound around it.

In addition, the electric coil 15 is wound on the outer surface of the variable permanent magnet 14 attached to the lower surface of the pole member a plurality of times in one direction, and electrically connected to an external power supply flow direction of the current supplied therethrough By varying the magnetization direction, the magnetization direction is reversed to control the adsorption and desorption force.

Here, the electric coil 15 is drawn out from the crane, and is connected to an electric conductor 15a capable of switching the current supply direction.

In addition, the square case 16 is a receiving member having a sufficient internal space to accommodate the pole member 12, fixed, variable permanent magnets (13) (14), the fixed, variable permanent magnet (13) As the magnetic force line generated by (14) serves as a smoothly moving magnetic field, such a rectangular case 16 is configured using a SS40 material.

Here, the size of the variable permanent magnet 14 is 100 × 100 × 100 mm, which is the maximum size of the existing manufactured ernico permanent magnet, so that 100 × 100 × 100 mm and 100 × 100 × 50 mm are used for the cross-sectional area of the pole member 122. The numbers were matched and assembled on each outer surface.

In addition, when winding the electric coil 15 to the outer surface of the variable permanent magnet 14, it is preferable to round each corner of the variable permanent magnet 14 to prevent damage to the electric coil 15. When the heavy object is sucked up and hoisted by the adapter 11 of the pole member 12, the adapter 11, the pole member 12, and the like so that the pole member 12 is not separated by the load of the heavy material. A plurality of fixing bolt members 17 penetrating the bottom surface of the variable permanent magnet 14 and the saga case 16 is mounted, the nut member 17a is fastened to the end thereof. The material of the bolt member 17 is SCM435 (Cr-Mo), yield strength of 95 kg / mm ² is suitable, the diameter is 16mm or more in consideration of the safety factor, it is safe to use 20 or more.

In addition, in order to assemble the hoist 1, the variable permanent magnet 14 is placed in the square case 16, and the electric coil 15 is wound so that the variable permanent magnet 14 can be fully magnetized and inverted. Next, mold with silicon rubber.

Then, the pole member 12 having the adapter 11 is positioned on the upper end of the variable permanent magnet 14, and then the bolt member 17 is inserted into the nut through the matching threaded holes 11a and 14a. While fastening the member 17a, the fixed permanent magnet 13 is stacked and mounted on the outer surface of the pole member 12 in the same direction as the designed magnetization direction.

After completion of the assembly work in succession, all remaining portions, which are empty spaces of the rectangular case 16, are molded with silicon rubber, and the traction machine package using the permanent magnet is completely sealed with a molding material and then squared. SUS 304 plate 19 made of non-magnetic stainless steel to close the gap between the rectangular case 16 and the pole member 12 so as to be magnetically discontinuous with the main body of the hoist 1 flowing magnetic flux while completely sealing the inside of the case 16. As fully sealed.

In the design of the hoist 1, the stacking height of the fixed and variable permanent magnets 13 and 14, the thickness of the rectangular case 16, the size of the pole member 12, and the like are important for determining the adsorption force and the desorption force. As it becomes a variable, the following describes the process of determining the optimum design value.

When designing the hoist using permanent magnet, the adsorption and desorption force were calculated by three-dimensional computer simulation by actual dimensioning using a program called Opera-3D, a commercial program based on the finite element method. The results are shown in Table 1 below.

As a result of the analysis, the size of the pole member 12 is 100 × 35 × 24 cm, the size of the variable permanent magnet 14 is 110 × 35 × 10 cm, and the size of the fixed permanent magnet 13 is 110 × 5 ×. 125, 5 × 35 × 12.5 cm should be determined.

Pole member (cm) Variable permanent magnet (cm) Fixed permanent magnet (cm) Rectangular case thick (cm) Ton force Ton force 110 × 35 × 24 110 × 35 × 10 110 × 5 × 105 × 35 × 10 3 57.261 2.891 100 × 40 × 24 100 × 40 × 10 100 × 5 × 105 × 40 × 10 5 64.636 2.981 110 × 35 × 24 110 × 35 × 10 110 × 5 × 105 × 35 × 10 70.225 2.749 110 × 35 × 24 110 × 35 × 10 110 × 5 × 105 × 35 × 10 8 86.992 4.129 110 × 35 × 24 110 × 35 × 10 110 × 5 × 12.55 × 35 × 12.5 95.777 0.858

In addition, the design and configuration of the adapter 11 in the hoisting machine 1 of the present invention is a very important factor and its shape and dimensions were determined in consideration of the radius of the cold rolled coil that is actually produced and wound. In the case of cold rolled steel coil, the maximum radius r of the coil to be wound is 1025 mm, and the minimum radius is 550 mm.

However, when the adapter 11 suitable for the rolled steel coil is replaced according to the radius of the rolled steel sheet coil, the work efficiency is greatly reduced by the time required. The hoisting capacity to the radius was calculated by computer simulation. The results are summarized in Table 2 below.

Coil Radius (mm) Air gap (mm) Ton force 10254 0.1 61.0 10 21.2 16 9.5 800 0.1 50.8 10 9.42 550 0.1 29.0 10 5.4

In Table 2, considering the weight of the rolled steel sheet coils corresponding to their respective radii, it was confirmed that the adapter 11 and the rolled steel sheet coils could be sufficiently used at a safety factor of 2 times or more when 0.4 mm or less. .

The variable permanent magnet 14 in which the pole member 12 having the adapter 11, the permanent fixed magnet 13, and the electric coil 15 are wound in the inner space of the square case 16 of the hoisting machine 1 as described above. The work of hoisting the steel plate coil M, which is a heavy object in a state in which the built-in unit is constructed, as shown in FIG. 5, has a ring 16a mounted on the sealed bottom surface of the rectangular case 16 upwards. Hanging on the hook K of the crane (not shown), the adapter 11 at the top of the square case 16 is shifted to the bottom to correspond to the steel plate coil M having a curved outer surface.

In this state, the fixed and variable permanent magnets 13 accommodated so that the adapter 11 mounted to the outer diameter of the steel sheet coil M are in close contact with the outer surface of the steel sheet coil and are difficult to fall out of the rectangular case 16. The steel sheet coil M is firmly adsorbed by the adsorbing force by the magnetic force of 14).

At this time, as shown in Fig. 4 (a) (b), the starting point of the arrow appearing in the magnetization direction is the S pole, the end point is the N pole, and the operation of adsorbing to the steel sheet coil will be described. The upper part of 13) is arranged in the direction in which the magnetization directions are all out of the center, and in the case of the lower part, it is arranged in the direction of gathering toward the center. In addition, the magnetization direction of the variable permanent magnet 14 located at the lower end of the fixed permanent magnet 13 is also a steel plate coil (M), which is a heavy object because the upper end is disposed in a direction away from the center, the lower end toward the center It can be lifted by adsorbing.

On the other hand, the magnetization direction of the fixed permanent magnet 13 is unchanged in the direction of the first arrangement and the variable permanent magnet 14 at the lower end of the magnetization direction in accordance with the current supply direction supplied to the electric coil 15 wound around It depends on the purpose of adsorption and desorption.

Accordingly, in contrast to the above, when the steel sheet coil M of the hoisting machine 1 is detached and detached, the electric coil wound around the variable permanent magnet 14 as illustrated in FIG. 4 (c) (d). When the current supply direction supplied to the (15) side is reversed, the upper end portions of the fixed permanent magnets 13 are arranged in a direction in which all the magnetization directions are toward the center, and in the case of the lower end, they are arranged in an assembling direction away from the center. The magnetization direction of the variable permanent magnet 14 located at the lower end of the fixed permanent magnet 13 is also disposed in a direction toward the center of the upper end and a direction away from the center of the lower end.

Accordingly, the hoisting machine and the steel plate coil can be separated from each other in a state where the steel plate coil, which is a heavy product, is placed in a desired place.

According to the present invention as described above, by combining the poles and yokes of soft magnetic materials with high magnetic permeability and soft magnetic materials with high magnetic permeability, it is a curved external force as a strong adsorption force generated by appropriately concentrating magnetic fluxes generated from fixed and variable permanent magnets. Since the coil having a surface can be easily and safely lifted, there is no risk of a safety accident in which heavy objects fall due to the interruption of the supply of electric energy as in the prior art. Effect is obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (5)

In the hoisting machine used to be mounted on a crane so as to hoist a heavy object such as a rolled steel sheet coil M by magnetic force, A pair of left and right pole members 12 mounted on an upper surface of an adapter 11 having a front surface in close contact with an outer surface of the steel sheet coil M, and focusing magnetic force lines; A plurality of fixed permanent magnets 13 attached to surround the outer surface of the pull member 12 to generate a main force line; It is wound on the outer surface of the variable permanent magnet 14 attached to the lower surface of the pole member 12 to generate a magnetic field line, and inverted in the magnetization direction according to the current flow supply direction to adjust the suction and detachment force. Electric coil (15) and Coil hoist using a permanent magnet, characterized in that the pole member 12, a fixed, variable permanent magnet (13, 14) is accommodated, and a magnetic case line is a square case (16) to act as a magnetic force to move smoothly. . The method of claim 1, The adapter 11 and the pole member 12 has a high permeability, a very high saturation magnetization value, and a coil winding machine using a permanent magnet, which is made of ultra low carbon steel having a carbon content of 0.03 wt.% Or less. The method of claim 1, The fixed permanent magnet 13 has a range of intrinsic coercive force (iHc) of 8-15 kOe and residual magnetic flux density (Br) of 8-12 kG, and rare earth-based permanent magnets Nd2Fe14B and SmCo5 having strong coercive force and current magnetic flux density. The variable permanent magnet 14 has a coercive force (Hc) of 700 to 1500 Oe, a residual magnetic flux density (Br) of 10 to 12 kG, a high magnetic current density but a small coercive force, and is wound around Coil hoist using a permanent magnet, characterized in that consisting of the Ernico (Alnico) magnet is easy to reverse magnetization by the electric coil. The method of claim 1, Each corner of the variable permanent magnet 14 is rounded to prevent damage to the electric coil 15 when the electric coil 15 is wound around the outer surface of the variable permanent magnet 14. Coil hoist using permanent magnet. The method of claim 1, The upper surface of the adapter 11 is a coil hoist using a permanent magnet, characterized in that configured in an arc shape to be in close contact with the outer surface of the steel sheet coil made of a curved shape.