JPS6013603A - Method of aligning and packing slender metallic needle-shaped piece having magnetism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to
This invention relates to a method for tightly packing magnetic long thin metal needles such as fibers, iron nails, and iron screws by arranging them in a non-magnetic container such as a corrugated pole box or a plastic case using an electromagnet.

For example w4! A method of using electromagnets to line up and pack lI fibers into containers made of corrugated poles is disclosed in Japanese Patent Application Laid-open No. 51-150.
498, JP-A-56-113521, JP-A-56-13
11.20, etc., when #iI fibers are placed in a magnetic field that is continuously excited, the steel fibers are held in a floating state in the magnetic field, and although they are aligned, they are not packed tightly. It was not possible to achieve this goal.

Next, the method of intermittent electromagnetic current to allow the aligned steel fibers to fall naturally into the container was disclosed in Japanese Patent Publication No. 55-48001.
However, in this method, the steel fibers that come into contact with the container wall face resistance from the wall surface when falling, and the height near the wall surface is higher than the center of the container, and the steel fibers are stored in a U-shape. There were drawbacks.

The purpose of the present invention is to provide a packaging method that improves the above-mentioned drawbacks, by placing a non-magnetic container in the magnetic field of an electromagnet that is excited by passing an electric current through it, and intermittently filling the container with mlI and fibers that have been previously deagglomerated and dispersed. At the stage where the magnetic force is demagnetized and the steel li/fiber falls into the container, a current is first passed in the opposite direction through this electromagnet for a short period of time to reverse the polarity of the magnetic field. The residual magnetism of the steel fibers that were in contact with the container wall is used to repel the magnetic force, and after the steel fibers are separated from the wall surface, the electromagnet is demagnetized to eliminate the contact resistance between the steel fibers and the container wall. The #ll fibers were allowed to fall under their own weight in a separated state, and the #ll fibers were stored in the container so that the two sides were horizontal, thereby obtaining the effect of tightly arranged and dense storage.

That is, in the present invention, when an electromagnet is disposed close to the outer wall of the container and the magnetic steel #11 fibers are aligned using magnetic force, the steel fibers near the container wall near the magnetic pole have considerable strength. We focused on the fact that the electromagnet retains a considerable amount of residual magnetism immediately after demagnetizing it, and used this residual magnetism as a repulsive force to solve the second problem.

A feature of the present invention is that when storing and packaging a magnetic elongated metal side piece in a non-magnetic container, a DC electromagnet that generates parallel magnetic flux in the horizontal direction is installed, and an upper part is placed in the magnetic field. An open box-shaped container is positioned, and elongated magnetic metal needles are intermittently introduced into the container from above while being dispersed, and the electromagnet is kept in a positive polarity from the start of the intermittent injection cycle until immediately after the interruption of the injection. After energizing and interrupting supply, -
This is a method for arranging and packing elongated metal side pieces to improve magnetism, which is characterized by repeating excitation to opposite polarity and then demagnetization.

A detailed description of the present invention will be given by taking a method of aligning and packing steel fibers as an example.

FIG. 1 is a plan view of a packaging facility to which this method is applied, and FIG. 2 is a sectional view taken along the line A--A in FIG.

It has a rectangular or circular cross section of (0,2 to l) mm,
Steel f with a masked shape with a length of about 10 to 60 mm
Ail is charged from a feeding device 1 such as a belt conveyor 2 to a hopper 4 equipped with a gate 3. The gate 3 is intermittently opened and closed in conjunction with the energization of the DC' electromagnet 5.

That is, the gate 3 is opened by an opening/closing device such as an air cylinder 6 at the same time as the electromagnet 5 is energized, and after the gate 3 is closed, the electromagnet is reversely excited and demagnetized. Steel fiber l is air noma 7
After passing through the dispersion device 8 which is vibrated by the above-mentioned method, the liquid drops through the chute guide 9 into a non-magnetic container 10 placed within the magnetic field of the electromagnet 5 .

The dispersing device 8 has the function of uniformly dispersing the steel #Im supplied from the hopper 4 and throwing it into the magnetic field of the electromagnet 5, and for example, it is used to distribute the steel #Im supplied from the hopper 4 into the magnetic field of the electromagnet 5.
A vibrating body with a dispersion slit arranged in parallel,
Without this, most of the steel fibers would be placed in the center of the container 10 and would not be stored uniformly in the container. In addition, since gate 3 is opened and closed intermittently, the steel fibers that have accumulated in gate 3 while the gate is closed are entangled with each other, so when gate 3 is opened and the steel fibers are allowed to fall, this will cause the steel fibers to become entangled. Unless the particles are dispersed by the dispersing device 8, it is difficult to align them using only the magnetic force of the electromagnet 5.

The dispersing device 8 may be operated continuously, or may be controlled to operate only when necessary, that is, while the gate 3 of the hopper 4 is open.

The chute guide 9 needs to be long enough to protect the hopper 4, the dispersion device 8, and the steel fibers 1 from being affected by the leakage magnetic force of the electromagnet 5, and is made of non-magnetic material.
The body must be made of, for example, 5US304, non-ferrous metals, plastic, wood, etc.

Steel # distributed in the magnetic field excited by the DC electromagnet 5! The li fibers are aligned sideways in the magnetic flux direction and held horizontally in the form of a shelf. Close the gate 3 according to a predetermined time cycle, and after a minute time, switch the current flowing through the electromagnet to momentarily flow the current in the opposite direction to reverse the polarity of the magnet, and then turn off the current at l/X. During excitation, the steel fibers are attracted to the inner wall surface of a container such as a corrugated pole due to the magnetic force in the positive direction, and the steel fibers are slightly separated from the wall surface of the container as their residual magnetism receives a repulsive force due to the magnetic force in the opposite direction. after that.

When the current is stopped, it falls to the bottom of the container in a horizontal position due to its own weight. In the conventional I/X method that does not require reverse excitation, the steel fibers that are in close contact with the container wall fall with the longitudinal direction of the steel fibers nearly perpendicular due to the residual W1 magnetism and the frictional resistance between the container wall and the container wall.

The present invention also has the effect of significantly reducing residual magnetism held by steel fibers by applying reverse excitation.

In the present invention, since the electromagnet is turned on and off, the gate 3 is opened and closed intermittently. If steel tea is introduced during the current stop time, the steel #ll# will remain in the container without being aligned, and most of it will not be aligned even after the next energization, so the stored steel fibers will be densely packed. Sexuality is inhibited. Further, the closing timing of the gate 3 is set a little earlier than the excitation stop. This is dispersion W
8. It is essential to align all the m fibers remaining in the chute guide 9.

The container lO is vibrated in the vertical direction by the vibrator 12 while the electromagnet is not excitation, and the steel fibers housed in the container are further settled down. The vibrator 12 is installed under the roller conveyor 11 for carrying in and out containers. Although it is effective even if the direction of vibration of the vibrator is horizontal, in the case of horizontal direction, the steel fibers tend to be biased left and right or front and back within the container, so it is preferable to vibrate in the vertical direction.

After the vibrator 12 is vibrated for a certain period of time, it is stopped, the gate 3 is opened, and the electromagnet 5 is energized.This cycle is then repeated.When the container is completely filled with steel fibers, the gate 3 is opened.
1, the electric current of the electromagnet 5 and the vibrator 2 are cut off, and the container filled with steel fibers is transferred onto the vibrating table 13 shown in FIG. Prepare it in a fixed position within the magnetic field and start the next packing operation.

FIG. 3 shows a side view of the vibrating table portion (as viewed from the arrow B-B in FIG. 1), and the vibrating table 13 is a device that applies minute vibrations in the upward direction. The container 10 filled with steel fibers is carried to a fixed position on the vibrating table and stopped, and the weight 14, which has been lifted by a lifting device such as an air cylinder 15, is suspended above the container 10. Freely load onto the steel fiber l. Thereafter, the vibrating table 13 is driven until the next container is filled with steel fibers and transported out. The vibration table 13 is used to further consolidate the steel fibers. When the weight 14 is loaded, the suspension ring 16 is designed to have a gap so as not to impede the effect of vertical vibration of the vibration table 13. Before the next container 10 completes storage of one steel H&fiber and is carried out, the operation of the vibration table 13 is stopped, the weight 14 is pulled up, and the container is sent to the packaging lid closing process by the roller conveyor 11.

In the above-mentioned series of steel #1I fiber alignment and packaging work processes, automatic transfer equipment, automatic detection equipment, etc. are used to transfer the container, stop at a fixed position, and detect the fullness of the steel fibers when they are loaded, aligned, and packed. Of course, automation is also possible.

With the method of the present invention, the conventional method of intermittent electromagnets had the disadvantage that steel fibers were stored in a U-shaped surface due to the resistance of the container wall, but this can be prevented and it is now possible to store the steel fibers uniformly and densely. .

Further, the present invention has the effect of significantly reducing the residual magnetism of the metal copper piece.

Next, the effects of the method of the present invention will be explained in more detail with reference to Examples.

Example The present invention was carried out using the apparatus shown in FIGS. 1 to 3.

The construction specifications are as follows.

(1) m fiber dimensions 0.5 x 0.5 x 30 m
m(2) Electromagnet specification Voltage 180~200■ Current 5.0~5.6A Magnetic flux density Center plane between both poles 450~680 Gauss On both poles 820~1800// (3) Corrugated pole box dimensions (inner dimension) 190X400X Depth 120mm Internal volume 9120cm' (4) Storage capacity of one box 20 kg ゛ (5) Bulk specific gravity specified from the size of the box 2.19 Figure 5 (a) to (e) are shown in (a) to (e) below. It is a cross-sectional view showing the state of tam fibers stored in the box according to each step of (e), and shows the case where the best results were obtained under each condition. However, the box shown in Figure 5 has dimensions (
Inner method) 190 x 400 x depth 180-200 is shown.

('a) is a case where only the electromagnet current is interrupted using the conventional method, and the average height is 179.3 mm and the average bulk specific gravity is 1.4.
7(b) has an average height of 154.7 mm and an average bulk specific gravity of 1.70 when instantaneous reverse excitation is applied to the intermittent electromagnet using the method of the present invention.

Comparing Section L (a) and (b), in the method of the present invention, the difference in height of the steel fibers near the container wall and near the center becomes extremely small, and the bulk density is improved. . Furthermore, (c) shows the average height of 133.2 mm and average bulk specific gravity of 1.98 when vertical vibration is applied to the product stored using the conventional method of (a) above. When the same vertical vibration as in (c) was applied to the invention method, the average height was 120.3 mm and the average bulk specific gravity was 2.19.

In the method of the present invention, the average bulk specific gravity is high and reaches the target bulk specific gravity value. moreover.

(e) shows the example of (d) above, which was vibrated by loading a weight of approximately 5 kg on a vibration table, and packed more tightly under pressure, with an average height of 100 mm. 5mm, average bulk specific gravity 2. '62. If the method of the present invention is combined with this weight-loaded vibration, it is possible to obtain a package with a bulk specific gravity that is extremely high compared to the bulk specific gravity of about 2.0 that was conventionally obtained with packaging of this type.

Further, FIG. 6 shows an example of the time cycle of optimal operation obtained in the apparatus used in this example. Of course, this time cycle varies depending on the material of the W4 fiber, such as mild steel, ferritic stainless steel, etc., the size, shape, production size of the steel 1111, etc., and the dimensions of the container.

In Figure 6, the reason why there is a current interruption time of approximately 0.5 seconds between switching from forward excitation to reverse excitation of the electromagnet is to reduce the severe load caused by instantaneous switching of the magnetic contactor. It has been confirmed that this is a permissible value that does not cause any difference in the effectiveness of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an apparatus to which the method of the present invention is applied. Figure 2 is a sectional view taken along the line A-A in Figure 1, Figure 3 is a view taken along the line B-B in Figure 1, fJ', and Figure 4 shows an example of the dispersion device.
) is a plan view, and (b) and (C) are respectively C- in figure (a).
The C arrow view, the D-D arrow view, and FIGS. 5(a) to (e) are cross-sectional views showing the storage state of steel fibers in containers according to the conventional method and the embodiment of the method of the present invention, and FIG. 6 is the main view. It is an example of the time cycle diagram of the invention method. ■...Steel fiber 2...Charging device 3...Gate 4...Hopper 5...Electromagnet 6...Gate opening/closing device 7...Dispersion device drive device 8...Dispersion device 8a ... Bar 9 ... Chute guide 10 ... Non-magnetic container 11 ... Roller conveyor 12 ... Vibrator 13 ... Vibration table 14 ... Weight 15 ... Lifting device 16... Suspension ring applicant Kawasaki Steel Co., Ltd. agent Patent attorney Yoshio Kosugi No. 5 (a) (C) (d)

Claims (1)

[Claims] ■ When storing and packaging magnetic elongated metal needles in non-magnetic containers, a DC electromagnet that generates parallel magnetic flux in the horizontal direction is installed, and a box-shaped container with an upward opening is positioned within the magnetic field. , intermittently inject thin magnetic metal needles into the container from above while dispersing them, and excite the electromagnet to a positive polarity from the start of the intermittent dosing cycle until immediately after the discontinuation of the dispensing, and once after the discontinuation of the dispensing, A method for arranging and packing elongated magnetic metal needles, the method comprising repeatedly energizing them to opposite polarities and then demagnetizing them.