JPS5844521B2 - How to store magnetic needles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for effectively packing magnetic needles such as needles, nails, or steel fibers mixed into reinforced concrete by tightly storing them in a container.

When magnetic needle-like materials are stored in a container for transportation or storage, conventionally, they have been placed randomly or by applying vibration.

However, the shape of the magnetic needle-like material is long and thin, and it is bulky because it is not aligned when stored, leaving a lot of space inside the container, so the storage weight per unit volume is low and it is packed and transported. There were problems such as high costs and damage to the load during transportation.

In order to eliminate such drawbacks, the present invention aims to provide directionality to the magnetic acicular material by passing it through a magnetic field when storing the magnetic acicular material in a container. We propose a method for efficiently storing a large amount of magnetic needles in a high-density manner by aligning them, by arranging different magnetic poles of a pair of electromagnets to face each other in parallel with a gap in between, and connecting the other magnetic poles with a yoke. A non-magnetic container buffered and supported by an elastic body is placed in the gap of the magnetic circuit so that it can be moved up and down in the direction perpendicular to the magnetic field within the gap, and at the same time as the electromagnet is energized, the magnetic acicular material is continuously inserted into the non-magnetic material. The elastic body is compressed by the weight of the magnetic needle-like material put into the container, and the non-magnetic material is placed in such a way that the top surface of the magnetic needle-like material in the non-magnetic container is always located at the upper end surface of the magnetic pole. The gist is to sequentially align and store magnetic needles in a non-magnetic container while lowering the container, and to cut off Q current to the electromagnet after the magnetic needles are aligned and stored.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings.

FIG. 1 shows an apparatus for carrying out this invention.
A magnetic circuit in which electric iron coils 3a and 3b are wound around opposite ends of a rectangular yoke 1 across a gap 2, and magnetic pole pieces 4a and 4b whose end surfaces are parallel to each other and have different polarities are placed opposite each other. 5.

Then, a lifting device is placed on the bottom of the yoke 1.

In this elevating device, a support 8 protruding from the bottom of a non-magnetic saucer 10 is inserted into a plurality of guide holes 7 provided in a base 6, and a coil spring 9 is fitted into the support 8. The spring force supports the tray 10 in a floating manner, and a non-magnetic container 11 (hereinafter simply referred to as a container) made of cardboard, plastic, etc. is placed on the tray 10.

The coil spring 9 is compressed by the weight of the magnetic needles 13 that are continuously introduced into the container 11, and the container is held so that the upper surface of the magnetic needles 13 in the container 11 is always located at the upper end surface of the magnetic pole. It has the property of causing it to fall.

Further, when the magnetic needle-like materials 13 are sequentially arranged and stored in the container 11 on the base 6 and the saucer 10 is lowered to the lower limit position, that is, after the magnetic needle-like materials 13 are arranged and stored, the electromagnetic coil 3
A limit switch 14 is provided to cut off the power to a and 3b and open the magnetic circuit 5.

A shooter 12 is provided above the saucer 10 to allow the magnetic needle-like material 13 to be thrown into it.

The attractive force F of the magnetic field in the magnetic circuit 5 is expressed by the following equation.

H However, H is the strength of the two magnetic fields, : Magnetic gradient Z N is the demagnetizing field coefficient, and C is the strength of the magnetic field of the material. As shown in Figure 2, the magnetic field between point A at the bottom of the pole piece and point B at the top of the pole piece is the strongest and constant, but the strength of the magnetic field decreases as it moves upward away from point B at the top of the pole piece. I understand that.

The present invention will be carried out using the apparatus described above.

At the same time as the electromagnetic coils 3a and 3b are energized, the magnetic needle-like material 13 is continuously thrown into the container 11 via the shooter 12.

At the beginning of charging the magnetic needle-like material 130, the container 11 is located above the magnetic pole pieces 4a and 4b where the magnetic field is weak, so the magnetic needle-like material to be charged is placed in the container 1, where the attraction force of the magnetic field to the magnetic material is weak.
The bottom of 1 is completely reached and aligned.

Furthermore, since the coil spring 9 has the above-mentioned characteristics, as the weight inside the container 11 increases, it is compressed by the weight of the magnetic needle-like material 13, so that the upper surface of the magnetic needle-like material inside the container 11 is always aligned with the top of the magnetic pole. The container 11 is lowered so that it is located at the end surface.

Therefore, the magnetic needle-like materials 13 are sequentially aligned and deposited to complete the alignment and storage, and at the same time, the limit switch 14 is activated.
Power to the magnetic coils 3a and 3b is cut off.

In this invention, the first magnetic needle-like material out of the magnetic needle-like materials successively introduced into a container is aligned at the bottom of the container, and then the magnetic needle-like material moves in a strong and constant magnetic field by its own weight. The feature is that the magnetic needles are aligned while gradually lowering the container through an elastic body.

As a result, the magnetic needles that are being put into the container are not magnetized all at once, and the top surface of the magnetic needles in the container is always located at the top end of the magnetic pole, so the ones closest to the bottom of the container are inserted first. Since the magnets are magnetized in the order in which they are placed and stored in an evenly spaced manner, they are stored in a dense state in the direction of the magnetic field without causing a dangling state due to magnetic force.

Furthermore, since the magnetic needles are continuously fed, the storage work can be carried out quickly and efficiently.Also, after the magnetic needles are arranged and stored, the magnetic circuit is automatically opened by a limit switch.
Even a container in which the magnetic needle-like material is tightly packed can be easily taken out from the gap in the magnetic circuit.

Next, embodiments of the present invention will be described in detail.

Thickness 0.25, trans width 1 line length 25, weight 30
η steel fiber, internal dimension is 440tran vertically
, when storing in a cardboard container with a width of 210 trrm and a height of 175 mm, the magnetic pole piece is 540 mm with the apparatus shown in Fig. 1.
X 140rran, magnetizing force 30kAT, Z direction magnetic gradient average 2000e/cms maximum magnetic field strength 20000
Using a magnetic circuit of e.g., the steel fiber is
As a result of charging at kt/min, the bulk specific gravity inside the container is 2kg.
1/l, which is more than double the storage rate compared to the conventional method.

According to this invention, when storing the magnetic needle-like material in the container,
Since the magnetic needles can be automatically and easily aligned and stored in a certain direction, the storage rate per unit volume can be efficiently improved, and packaging and transportation costs can be reduced.
Furthermore, it has the effect of reducing the damage caused by packaging during transportation.

[Brief explanation of drawings]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a chart showing the vertical magnetic field distribution in the air gap of the magnetic circuit shown in FIG. In the figure, 1... Yoke, 2... Air gap, 3... Electromagnetic coil, 4... Magnetic pole piece, 5... Magnetic circuit, 6... Base, 7... Guide hole. , 8... Support column, 9... Coil spring, 10... Receiver, 11... Container, 12... Shooter, 13... Magnetic needle-like material, 14... Limit switch.

Claims (1)

[Claims] 1. A magnetic circuit is constructed in which different magnetic poles of a pair of electromagnets face each other in parallel with an air gap and the other magnetic poles are connected by a yoke. A non-magnetic container buffered and supported by an elastic body is placed in a magnetic field perpendicular to the air gap. The magnetic needles are placed so that they can be moved up and down in the direction of the magnet, and at the same time as the electromagnet is energized, the magnetic needles are continuously thrown into a non-magnetic container. While lowering the non-magnetic container so that the upper surface of the magnetic needle-like materials inside the magnetic container is always located at the upper end surface of the magnetic pole, the magnetic needle-like materials are sequentially arranged and stored in the non-magnetic container, and the magnetic needles are A method for storing magnetic needle-like materials, characterized in that after the materials are aligned and stored, electricity to the electromagnet is cut off.