JPH08330135A - Molding magnetic powder removing apparatus - Google Patents

Abstract

PURPOSE: To automatically remove magnetic powder stuck even after a molding is demagnetized by installing a demagnetizing coil under a conveyor for conveying the molding, connecting a gas injector or the like having a joint, an elbow and a pipe to the block of a pipe end, and installing it above and below the conveyor. CONSTITUTION: A molding 12 compression molded in a magnetic field by a powder molding machine 20 is placed at the position 12a on a conveyor 1, and moved to 12a,..., 12e upon moving of the conveyor 1. A demagnetizing coil 3 is disposed under the conveyor 1 in which the mold 12 is moved from 12a to 12b, a magnetic field is applied at the time of molding, and the magnetic force of the compression molded molding is demagnetized. Then, at the moved molding 12, the magnetic powder not completely removed at the place 12b at the time of molding is blown by injecting high-pressure gas from the lower and upper parts by a high-pressure injector 4 at the upper and lower parts between 12c and 12d. Thus, the magnetic powder can be removed without applying vibration to the moldings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic powder removing device for a molded body, and in particular, an operator does not have to shake his or her hand directly on the molded body
The present invention relates to a molded body magnetic powder removing device capable of automatically removing magnetic powder attached to a molded body by jetting a gas.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a rare earth magnet or a magnet having a high coercive force, a powder of a magnetic material is powdered in a mold and compression-molded while giving anisotropy in a magnetic field. After that, it was taken out of the mold and demagnetized on the demagnetizing coil, but the magnetic powder could not be completely removed, and vibration was applied during demagnetization to remove the magnetic powder. If the molded product is a small product or a thin product, it is lightweight, so some deviation occurs due to vibration, and magnetic particles are removed even in the demagnetizing coil.
The applicant has already demonstrated this in Japanese Patent Application No. 56-115372.

[0003]

However, not only small and thin products are always produced, but the variety composition is changing. That is, there are various types such as semi-circular and cylindrical shapes, and large blocks such as rectangular block products and tall products. Therefore, in order to remove magnetic particles from such a molded body, giving a baffle plate or vibration itself causes a chip or breakage of the molded body, which causes problems such as defective products and generation of more magnetic powder. is there. The present invention eliminates such drawbacks, without giving vibration to the molded body, without the operator directly shaking the hand, various molded bodies adhere to the magnetic powder even after demagnetization. It is an object of the present invention to provide a molded body magnetic powder removing device that can be automatically removed by injection.

[0004]

In order to solve these problems, in a molded body for molding a powder containing a magnetic material in a magnetic field, a demagnetizing coil is installed under a conveyor for conveying the molded body, A molded body magnetic powder removing device in which gas injection equipment consisting of a joint, an elbow, and a curved pipe is connected to the block at the end of the pipe and installed above and below the conveyor, and at the same time, a bearing is mounted on the upper part of the elbow. Has an injection nozzle hole at the tip of the curved pipe connected to the other end of the pipe and a gas discharge hole at the side of the pipe, and injects gas into the molded body from the injection nozzle hole. In addition to rotating the elbow and curved pipe with the exhaust pressure of gas, adjusting the length of the curved pipe and injecting gas along the size of the molded body, further dividing the tip of the curved pipe, Compound Provided is a device for ejecting gas to both sides of a compact by a spray nozzle of a book, and for a large number of simultaneous compacts, a gas ejecting device is installed on an arm that reciprocates within the width of a conveyor. It is a thing.

[0005]

According to the present invention, the powder for molding is powdered in the die of the powder molding machine and compression-molded in the magnetic field. Although it is removed, some residual magnetic powder cannot be completely removed due to various shaped bodies. Gas is sprayed and blown while rotating in a shape similar to a molded body. In addition, by moving the rotating injection nozzle itself to the multiple widths of the conveyor,
The magnetic particles, dust, and adhered substances are blown off and dropped.

[0006]

【Example】

(Embodiment 1) Explaining an embodiment of the present invention with reference to FIGS. 1 and 2, an upper mold 21 and a lower mold 22 are attached and fixed to a powder molding machine 20 shown in FIG. The upper mold 21 is raised, and a powder feeder (not shown) is moved to the upper surface of the lower mold 22 to move the cavity 2 of the lower mold 22.
After the powder is filled in 3 and retreated, the upper mold 21 is lowered to compress and mold the powder in the cavity 23 in a magnetic field. After the molding is completed, the upper die 21 is lifted and at the same time the molded body of the cavity 23 is pushed up by the push-up die 24, and the carry-out arm 25 is moved forward to be placed on the conveyor 1. At the same time when the carry-out arm 25 retracts, the previous powder feeder moves to refill the cavity 23 of the lower mold 22 in which the push-up mold 24 has descended with powder.
The next molding cycle begins.

The molded body 12 placed on the conveyor 1 is at the position 12a, and the conveyor 1 moves around the rollers 2a and 2b by the rotation of the roller 2 which constantly moves in the arrow direction. Move to 12e. The conveyor 1 is a mesh conveyor made of a non-magnetic material and is a molded body 12.
The structure makes it easy to remove the powder adhering to. There is a demagnetizing coil 3 under the conveyor 1 that has moved from the molded body 12a to 12b, and a magnetic field is applied during molding to demagnetize the magnetic force of the compression molded body.

Next, in the moved molded bodies 12c to 12d,
The high-pressure gas injecting device 4 in the lower part and the upper part injects high-pressure gas from the lower part and the upper part to blow away the magnetic powder that has not been completely removed at 12b during molding. That is, a joint 7 is connected to the piping block 5, an elbow 8 with a bearing is provided on the upper portion thereof, and a curved pipe 9 having a proper length (l) is connected to the other end of the elbow 8 in this order. A pipe that can inject high-pressure gas is connected to the pipe block. The curved pipe 9 is provided with an injection nozzle hole 9a at its tip and an exhaust hole 9b at its side.
This uses a bearing (not shown) mounted on the upper part of the elbow 8 so that the elbow 8 and the bent pipe 9 are centered around the joint 7.
And are for rotating by the exhaust pressure of the gas.
Therefore, when the molded body moves to the points 12c to 12d, the above-mentioned gas injection device 4 is activated by the lower and upper sensors, and the high pressure gas is applied to the molded body 12 from the injection nozzle hole 9a of the curved pipe 9. Is jetted. Further, since the curved pipe 9 also has a gas discharge hole 9b on the side surface,
At the same time, when the gas is discharged from here, the elbow 8 and the curved pipe 9 rotate around the joint 7 in the arrow direction by the gas discharging force as described above.

Therefore, since high-pressure gas is jetted from the lower portion and the upper portion to the molded body 12 from the curved pipe 9 while rotating, the magnetic powder attached to the molded body is blown off. When the molded product reaches the point 12e due to the movement of the conveyer conveyor 1 in the direction of the arrow, the sensor is cut off and the supply of high pressure gas to the gas injection device 4 is stopped, so there is no gas injection and the rotation of the curved pipe 9 etc. also stops. . The adjustment of the strength and weakness of the gas is performed by the adjusting valve 6, and at the same time, the rotational movement is adjusted. Of course, if the length (l) of the curved pipe is changed depending on the size of the molded body, it is needless to say that the rotational movement of the same size as the molded body can be obtained.

(Embodiment 2) In FIG. 3, a plurality of injection nozzles for spraying gas at one time are provided on both inside and outside of the molded body 12. This is so that the gas hitting the upper part of the molded body does not interfere with other straightly advancing gas and does not weaken the velocity of the gas near the molded body. Note that the upper and lower gas injection devices 4 of the conveyor 1 are installed in the order of the lower part and the upper part in FIG. 2, but it goes without saying that the upper part and the lower part may be in the same place or the upper part and the lower part may be installed in this order. Further, it is also considered to provide a cover 11 that wraps the outside of the conveyor 1 to collect used gas, blown magnetic powder, powder and the like. The molded body 12 is also before firing, and the gas used is preferably dry air, but it goes without saying that an inert gas is desirable.

(Embodiment 3) In FIG. 4, when a large number of small compacts are formed at one time, a large number of compacts 16n move on the conveyor 15 at a time. So in this case,
If the high-pressure injection device 4 itself is attached to an arm (not shown) that can reciprocate over the entire width 17 of the conveyor 15, high-pressure gas injection can be performed on a large number of molded bodies 16n. Further, in the present application, description has been made regarding the magnetic powder at the time of molding the molded body, but it goes without saying that it is also used for removing dust, dust and the like.

[0012]

The following effects can be obtained by implementing the present invention as described above. 1) Magnetic powder that is not completely removed after demagnetization can be automatically removed by jetting a gas without direct shaking of the molded body or vibration. 2) By adjusting the length of the curved pipe, it can be automatically removed by jetting gas while rotating along the shape of the molded body. 3) By providing a plurality of injection nozzle holes, the gas is sprayed straight on both sides of the molded product without being disturbed by other parts, and the spraying force is not weakened, so that the deposits are easily and quickly removed. 4) When a large number of compacts are simultaneously molded and dedusted, they can be removed by moving a part of the gas injection device while rotating it across the width of the conveyor.

[Brief description of drawings]

FIG. 1 is a front view of an AA enlarged cross section of FIG. 2 of the present embodiment.

FIG. 2 is a partial side view of the molding machine and the conveyor of this embodiment.

FIG. 3 is a view showing a usage state of a plurality of injection nozzles of the curved pipe of FIG.

FIG. 4 is a partially enlarged cross-sectional front view of another embodiment.

FIG. 5 is a plan view of a conventional compact magnetic powder removing device.

FIG. 6 is a side view of the device of FIG.

[Explanation of symbols]

1 conveyor, 2 rollers, 3 demagnetizing coil,
4 Gas injection equipment 5 Piping block, 6 Adjustment valve, 8 Elbow, 9
Curved pipe, 9a injection nozzle hole, 9b exhaust hole, 1
2 molded body,

Claims (5)

[Claims] 1. In a molded body for molding a powder containing a magnetic material in a magnetic field, a demagnetizing coil is installed under a conveyer for conveying the molded body, and a joint is attached to a block at the end of the pipe.
A compacted body magnetic powder removing device, characterized in that gas injection devices including an elbow and a pipe are connected and installed above and below the conveyor, respectively. 2. A bending pipe connected to the other end of the elbow of the gas injection device by mounting a bearing on the top of the elbow has an injection nozzle hole and a gas discharge hole on the side of the pipe. Injecting gas from the injection nozzle hole to the molded body,
2. The compact magnetic powder removing device according to claim 1, wherein the discharge hole is rotated together with the elbow and the curved pipe by a discharge pressure of gas. 3. The gas injection can be performed along the size of the molded body by adjusting the length of the curved pipe.
The molded body magnetic particle removing device described. 4. The compact magnetic powder removing device according to claim 3, wherein the tip of the curved pipe is divided into a plurality of spray nozzle holes, and gas is sprayed to both sides of the compact. 5. The apparatus for removing magnetic powder from a compact according to claim 2, wherein a plurality of the compacts are molded at the same time and, after demagnetization, the gas injection device is installed on an arm that reciprocates within the width of the conveyor.