JPS61213302A - Rotary mill, charging apparatus and milling method - Google Patents

Abstract

A rotary-type mill is provided with a valve assembly (16) in association with a loading conduit (14) to enable the mill (11) to be charged under a controlled atmosphere so used for materials, e.g. aluminium, that must be milled under an inert atmosphere. To load material, a closed hopper (24) including a butterfly valve (25) is screwed to the top of the conduit (14) to provide a gas-tight seal between them; during this operation valve (16) is closed. The valve (16) is then opened by depressing valve stem (20) and valve (25) is then opened to allow material to be milled to pass straight into the mill (11). The valve (16) is then closed by pulling the stem (20) outwards so that the valve plug (19) fits snugly into the mill wall (11), the hopper (24) is removed and replaced by a fluid plate (not shown).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in an apparatus for charging a material into a container in an atmosphere capable of protecting the material, and more particularly relates to an apparatus for charging a material into a container in an atmosphere capable of protecting the material. (Batch type) This invention relates to a feeding device that can feed specific materials into a rotary mill while blocking air, a batch type rotary mill that uses this feeding device, and a flour milling method that uses this rotary mill.

[Prior art and problems]

When milling a variety of materials, it is often necessary or desirable to actively control the atmosphere within the milling equipment. For example, fine powders of highly oxidizable metals such as aluminum, titanium, magnesium, lithium, and other easily oxidized materials may burn out or even explode depending on processing conditions. Even if such a major accident does not occur, the fine powder is oxidized in the air and quality deterioration is inevitable. When milling such materials, it is necessary to control the atmosphere inside the milling equipment, and for this purpose, it is necessary to charge the raw material and the fine powder that is the product in a state where no air enters the milling equipment. must be taken out.

When designing equipment that uses powders such as metals, special consideration must be given to the shape of the valves that the powders come into contact with. The reason for this is that the powder gets into one part of the valve, rendering it inoperable.

The problem with milling is that of metals that are easily oxidized, such as aluminum, titanium, and magnesium.

Mechanical mixing of rare earth group metals such as lithium or cerium is problematic. Mechanical mixing is described in detail both in the literature and in existing patent specifications. For example, U.S. Pat. No. 3,740,210, U.S. Pat. There is a description. In the practice of mechanical lacrimation,
The powder is sent in the form of a powder to a high-speed milling device, such as a ball mill, and the inside of this milling device is in a state where oxygen in the form of a single substance or a compound is completely or reduced, and the fed powder is dried or almost dried. This powder is first ground into a fine powder, and this ground fine powder is agglomerated in a subsequent processing step. During the initial grinding stage, the surface area of the metal powder increases dramatically. Immediately after the newly formed surface is formed, it is in an unoxidized state and is extremely susceptible to oxidation, so if it comes into contact with air, it will immediately catch fire or, depending on the situation, the metal powder may even explode. Therefore, any part of the milling device, for example the metal powder charge and the discharge, reduces the quality of the fine powder produced and carries the risk of combustion or explosion.

In batch-type grinding mills, the feed material charging device has traditionally been at right angles to the milling device. In this type of milling device, when the milling shell is charged with feed material, the charging device is at right angles to the feed material charging section located at the top of the shell. An improved charging device is disclosed in a co-pending application in which the present application and the application die are the same. The improved charging device is located on the side of the mill and is shaped to be vertical when the outer shell of the mill is rotated to smoothly feed the charge into the mill. The co-pending application also discloses an apparatus for using a charging device of the disclosed configuration in a flour milling device, which includes creating an atmosphere within the milling device that is capable of protecting the feed material. There is a need. The present invention is particularly useful in conjunction with the improved charging device described above.

[Purpose and effect of the invention]

The present invention is used to charge a material to be milled, that is, a feed material, into a batch type rotary mill, and protects the feed material or product inside the rotary mill when charging the feed material and when taking out the product. It is an object of the present invention to provide a charging device which has a shape that allows a comfortable atmosphere and whose constituent members hardly wear out during the operation of the rotary mill.

The feed material charging device according to the present invention incorporates a currently used batch-type rotary mill, and can charge and operate the feed material in a state where outside air is shut off.

[Summary of the invention]

The present invention provides a batch rotary mill with improved charging equipment that allows powder processing and operation to be carried out under controlled conditions. The rotary mill includes a hollow rotating shell, a rotating device for the shell, and a charging passage provided at a suitable position in the shell for introducing the feed material into the shell and passing the feed material through it. For example, it has a charging hole or small hole and a charging device for charging the feed material into the rotary mill.

This charging device consists of a charging device and a feeding device for charging material, and the charging device is attached to the outer shell so as to cover the charging hole and seals the atmosphere of the charging passage with a seal,
the charging device is sealingly attached to the charging device, the charging device being at least partially disposed within a charging conduit for sealing the atmosphere and enclosing the atmosphere; the sealable charging conduit has an inlet and a discharge port for the charge material to be charged into the shell, and the discharge port receives the charge material from the inlet conduit. a plug valve aligned with a charging passage for feeding into the shell, the valve device being mounted so as to be sealingly attached to the shell side of the charging passage; and separating the plug valve from the hollow shell. and a closing device for sealingly aligning the stopper valve with the outer shell to close the rotary mill. Materials can be added while the atmosphere is sealed. The feeding device includes, for example, a charging device for storing the charging material, and the charging device is attached to the charging device so as to seal the atmosphere, and supplies the charging material to the charging device.

The valve device opens and closes the plug valve. When the plug valve is opened, it extends into the outer shell, and when the plug valve is closed, the plug valve is pulled into the charging hole to close the charging hole and any part of the inner surface of the plug valve is removed from the outer shell. Do not protrude from the inside,
In other words, when the plug valve is closed and the rotary mill is in motion, the inner surface of the outer shell is smooth to prevent wear of said plug valve during the operation of the rotary mill. Further, the plug valve is made of a material having wear resistance equal to or higher than that of the outer shell so as not to wear out faster than the outer shell.

When charging the feed material to the rotary mill, the outer shell (
(in an air-blocked condition) is rotated until the charging line is in a substantially vertical position on the side of the rotary mill, and the charging device, when so rotated, transfers the charge into the rotary mill. It has a shape that can be dropped perpendicular to. The closing lid, for example a blind flanged lid, is then removed from the charging device and the charging device containing the charge material is attached to the receiving opening of the charging device to seal off the atmosphere. This sealing is effected, for example, by a valve which, when opened, allows feed material to be poured into the rotary mill. The charging line is sealed with the charging device and the shell, but may be depressurized if necessary, or with an inert gas added to the charge using a device suitably located in the charging device. You can also scavenge with gas.

Thereafter, the plug valve is moved to an open position, for example, to a position where the material does not adhere to the part of the plug valve that enters the outer shell, and the valve of the raw material charging device is opened, so that the material is placed in a vertical position. It can be dropped into the shell through an inlet line.

After charging the feed material into the shell, the plug valve is closed and the closing device is closed to disconnect the charging device from the rotary mill, after which the charging device is removed together with its closing device from the milling device. , after which the charging line is resealed with the blind cap.

Also, if necessary, one or more charging devices can be installed along the length of the rotary mill, for example if the shell is long or the raw material to be fed is critical.

The present invention can be applied to a batch-type mill that grinds a specific material, such as a ball mill. The milling member of this mill may be, for example, spherical, rod-shaped, cobblestone-shaped, or any other suitable member. The mill is a single element,
The material can be pulverized in the form of compounds, ceramic alloys, or combinations thereof. The simple elements include, for example, nickel, copper, zinc, titanium, zirconium, niobium, molybdenum, vanadium, tin, aluminum,
Chromium, magnesium, lithium, iron, silicon.

It contains large amounts or small amounts of yttrium, Fussa group elements cerium and lanthanum, and the compounds include, for example, oxides of aluminum, magnesium, silicon, yttrium, cerium, and lanthanum.

The alloy is a nitride or a carbide, and the alloy is, for example, a master alloy consisting of aluminum and lanthanum, and a master alloy consisting of aluminum and manganese. The present invention is particularly useful when the material to be pulverized must be fed into a mill and pulverized in a controlled atmosphere.

In addition, the present invention particularly provides a method for making easily oxidizable metal powder into a material with a good dispersion rate, that is, an alloy, by powder metallurgy.
Useful when processing with a ball mill. Processing of such materials must be carried out under a controlled atmosphere, which may include hermetic sealing or scavenging, controlled venting of inert gases, or controlled amounts of hydrocarbons or alcohols.

This is carried out by a method such as filling with an inert gas containing an acid or other process control agent. The present invention is applicable not only to metals but also to atmospheres 1
Useful for milling any material for which it is necessary or desirable to perform 1J III, such as nickel, titanium, chromium, magnesium, copper.

It can be applied to increase the strength of alloys whose main components are iron or aluminum by powder metallurgy.

As previously discussed, material delivery devices of the configuration and capacity described in the co-pending application may be advantageously used with the valve arrangement of the present invention.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 schematically show cross-sections of a ball mill charging device 10. FIG. This ball mill has a hollow cylindrical outer shell 11 made of metal that rotates, and this outer shell 11 has a charging hole 12 through which the material to be fed into the ball mill passes. A charging device 13 is fitted with a seal, and this charging device 13 isolates the outer shell from the outside air.

The charging device 13 has a charging line 14 which has a removable sealing element 15, for example a flange of a blind lid, and a valve arrangement 16. The charging pipe 14 has an inlet 17 and a discharge port 18 for the charging material, and a valve (not shown) can be attached to the charging pipe. The discharge opening 18 of the charging line is aligned with the charging hole 12, which forms a smooth and unobstructed passage for feeding the feed material directly into the ball mill. The removable sealing device 15 is used to seal the charging line after introducing the charge into the shell 11. The feeding material charging device 24 has a butterfly valve 25.
may be replaced with a sliding gate or other suitable valve)
, the charging device 24 is attached to the receiving port 17 of the charging device 113 by bolts 26a, 26b. The valve device 16 has a plug valve 19 and an opening/closing device for the plug valve. The plug valve 19 has a shape that can hermetically seal the bolt between the outer shell 11 and the feeding device 13 when the plug valve 19 is closed. The above-mentioned plug valve opening/closing device has a stem 20 of the valve.
The stem 20 is flexibly coupled to the coupling device @31 to open and close the tap valve 19 (this stem can be replaced by other alignment devices). The stem 20 allows the plug valve 19 of the shell 11 to be opened and closed without exposing the material in the charging line 14 to air. The charging pipe 14 includes a valve gasket 21 and a gasket nut 21a.

and the guide device 20a of the stem 20 is attached to the receiving port to be sealed. This stem 20 extends outside the sealed portion and opens and closes the frame piece from outside the sealed portion of the charging device 13 to prevent air from entering the shell. Further, the flexible bellows 32 also seals the stem portion to prevent the pulverized material from leaking out. For this outer shell seal,
A valve seat consisting of an inclined rim 22 is provided in the charging hole 12.

The charging hole 12 may have any shape, but is preferably circular or oval. The rim 23 of the frame piece 19 aligns with the valve seat 22 of the frame piece to seal the shell when the frame piece is closed. Instead of doing this, for example, rim 2
3 or the valve seat 22 may be divided into spherical or other curved pieces to improve alignment and sealing between the valve and the valve seat. Furthermore, a sealing member made of an elastic material may be provided between the frame piece and the small hole. In a preferred embodiment, the angle a1, that is, the angle that the stem of the frame piece makes with the horizontal plane is preferably 45°. The sealing surfaces of the frame piece 23 and the valve seat 22 are connected to the stem 2.
Since the angle is about 45° relative to 0, the lower part of the valve seat 22 extends out of the vertical plane to prevent powder from accumulating at the discharge port. The frame piece 19 is made of, for example, a material with good wear resistance so as not to wear out during operation of the ball mill. The stem 20 of the frame piece is a device 29a for holding this stem 20 in the closed position.

29b (hole and bottle) and a device 30 (stem stop member) for limiting the distance of movement of this stem 20 to the open position.
and has. Instead of doing this, for example, the stem 20 may be provided with a threaded portion for opening and closing the frame piece. Furthermore, the external position of the stem 20 can be measured to determine whether the frame piece is open to allow material to be fed or closed to stop material from being fed. A discharge hole 27 is provided as a device for sweeping out the charging material accumulated in the charging pipe, and a pressure reduction pipe or an exhaust gas pipe is connected to the charging pipe through the discharge hole 27.

FIG. 1 shows a state in which the frame piece is in an open position and a seal is formed between the charging device and the inlet hole, and FIG.
The frame pieces are shown schematically in the closed position and the blind lid is closed, respectively.

The charging hole 12 is sealed by the frame piece during the operation of the ball mill. When the frame piece is in the closed position, no part of the frame piece projects into the shell 11.

When the frame piece is in the open position, the valve seat 22 is vertically aligned with the lower end of the charging hole of the charging line 14 and horizontally aligned with the upper end of the charging hole. With this construction, the material passes unimpeded through the inlet conduit into the shell.

The outer shell of the ball mill can be of any suitable shape, for example cylindrical, spherical, double conical, single conical, or with flat multilayer side walls; The exact shape of is not very important. Further, the outer shell is made double walled (i.e. jacket type) for cooling,
It is also possible to have a structure in which water or other refrigerant is passed through the space between the double walls (ie, the jacket). Various structures may be adopted for the outer shell of the ball mill and the attachment device for this outer shell, and such additional features are not important components of the present invention. The delivery device is sealed on the outside of the shell, for example at 7 langes.

To eliminate the need to align the inlet portion of the infeed device over the entire shell, the entire feed device, including the portion of the shell with the charging hole, may be removably attached to the shell. This structure also has the advantage that the charging device can be repaired or replaced without touching other parts of the shell.

FIG. 3 shows another preferred embodiment of the invention.

In this embodiment, a pair of charges @13.13a are located around the rotating shell 11 of the ball mill 40. This ball mill consists of a pair of support members 33, 34 and a cylindrical outer shell 11.
and the outer shell is supported on trunnion bearings 38,388 for rotation about a substantially horizontal axis. The shell has an end 35.degree. 36, a side wall 37, and a pair of charging holes (hidden in the figure by charging devices 13, 138).

This charging hole is isolated from the atmosphere by the pair of charging devices 13.13a, and this charging portion 13.13a is held in the outer shell 11 so as to cover each of the charging holes. In the diagram,
The description of flour milling members such as balls is omitted. The outer shell is drum-shaped, at its end 35 a drive 39 of the ball mill is provided. Since this drive device 39 is not a part of the present invention, a detailed description thereof will be omitted. The charging section @1
If the charging device 1 is of a substantially vertical shape so that the feed material can be fed into the ball mill under the action of gravity, the charging device 1
3.13a is on the side of said rotating shell 11 and includes part of the valve stem 20.degree. 20a as shown. The outer shell 11 is sealed to block air and is equipped with a device (not shown) for feeding gas to fill the interior of the outer shell. The gas may be nitrogen gas, argon gas, other simple gases, or mixed gases with or without process control additives, such as controlled amounts of hydrocarbons, oxygen, or carbon. A description of the device for discharging the fed raw material will be omitted. This is because suitable devices for that purpose are disclosed, for example, in co-pending applications filed on the same day as the present application.

The improved valve arrangement according to the invention operates as follows. That is, the feed material, for example metal powder, is fed in a sealed manner from the charging device.

The charging device is in a sealed state, the charging device 24 is attached to the charging device, the valve 25 is closed, but the valve stem 20 pushes the tap valve 19 into the heard position, i.e. when this tap valve is extending into said outer shell to a position opening a charging hole;
move it. Valve 25 is then opened and feed material is introduced from the charging device, which flows through the charging line into the rotating shell of the ball mill. Once the charge material has flowed from the charging device through the charging conduit into the shell, the valve stem 20 retracts the tap valve to the surface of the shell and the charging device is then removed. It will be done.

The charging line remains sealed even after the charging device is removed.

In the illustrated embodiment, the shell rotates about a generally horizontal central axis, but in other embodiments of the invention, the charging device rotates the drum-shaped shell about a non-horizontal axis. It is installed in the appropriate position of a rotating type ball mill.

Although the preferred embodiment of the present invention has been described above, this embodiment can be modified or improved within the scope of the present invention, and this should be easily understood by those skilled in the art. However, the above-mentioned improvements and changes are included in the present invention.

[Brief explanation of drawings]

FIG. 1 shows a state in which the improved valve device according to the invention is installed, the valve is ready for charging, the charging device is attached to the charging device, and both the charging device and the charging device are sealed; FIG. 2 is a schematic cross-sectional view of the charging section of a ball mill similar to FIG. 1 except that the plug valve is in the closed position and the charging device is in a sealed state;
FIG. 3 is a schematic diagram of multiple charging devices attached to a ball mill in accordance with the present invention. DESCRIPTION OF SYMBOLS 10...Charging device, 11...Outer shell, 12...Charging hole, 13...Charging device, 14...Charging pipe line, 15...
... Seal member, 16... Valve device, 17... Intake port, 18... Discharge port, 19... Plug valve, 20... Stem, 21, 21a... Nut, 22...・Valentine seat, 23
... Rim, 24... Charging device, 33.34... Supporting member, 39... Drive device, 40... Ball mill.

Claims (1)

[Scope of Claims] 1. A charging device for a batch rotary mill having a rotating hollow outer shell, a rotating device for the outer shell, and a charging hole for charging charging material into the outer shell, The charging device includes a charging device for a charging material that is sealed on the outer shell so as to cover the charging hole and sealingly isolates the charging hole from the atmosphere inside the outer shell, and a charging device that is attached to the charging device. a material feeding device, the charging device having a charging pipe for sealing off the atmosphere and passing the material to be fed, and a valve device installed in the charging pipe for sealing off the atmosphere. the charging line has a charge inlet and an outlet, the outlet is aligned with the charging hole, and the valve arrangement is in sealing alignment with the charging hole in the shell. an opening device for moving the plug valve from the charging hole into the shell to open the charging hole; and a closing device for sealingly aligning the plug valve with the charging hole and closing the plug valve. a charging device, characterized in that when the charging device is sealing off the atmosphere, the opening device and the closing device are activated so that the charging material can be charged into the rotary mill without being exposed to air. . 2. The charging conduit is attached to the receiving port to seal the atmosphere, the opening device and the closing device have a stem, the stem is movably coupled to the plug valve, and the charging conduit is attached to the receiving port to seal the atmosphere; 2. The charging device according to claim 1, which extends into the atmosphere through a conduit. 3. The charging hole has a molded rim, the plug valve has a rim, and the rim of the plug valve is attached to align with the rim of the charging hole. A preparation device according to claim 1. 4. The charging device according to claim 1, wherein the charging device is attached to a peripheral wall of the outer shell. 5. By setting the angle between the stem and a horizontal plane including the central axis of the outer shell to be about 45°, the charging material can be poured into the outer shell without stagnation through the charging pipe. A preparation device according to claim 1. 6. The charging device according to claim 1, wherein a coupling device for controlling the atmosphere of the charging pipe is installed in the charging pipe. 7. The feeding device according to claim 1, wherein the feeding device has a sealable material storage device. 8. The feeding device has the storage device, and the storage device includes a valve device and a sealing device for sealing off the storage device and the atmosphere, and the sealing device connects the storage device to the charging device. 2. The preparation device according to claim 1, wherein the preparation device is configured to hold. 9. An outer shell having a peripheral wall, a plurality of flour milling members in the outer shell, a rotating device for the outer shell, and a rotating device provided on the peripheral wall of the outer shell for charging feed material into the outer shell. one or more charging holes, and a charging device for charging a charging material into the shell, the charging device being held in the charging hole to seal the charging hole from the atmosphere inside the shell. a feed material charging device, the charging device having a charging conduit for sealing the atmosphere and a valve device mounted at least partially into the charging conduit for sealing the atmosphere; the charging conduit has a feed material inlet, a feed material discharge port aligned with the charging hole, and a device capable of sealing and opening the inlet; a plug valve in sealing alignment with the charging hole; an opening device for spacing the plug valve from the charging hole to open the charging hole; and an opening device aligning the plug valve with the charging hole to open the charging hole. and a closure device for sealing the
While the charging device seals the atmosphere, the opening and closing devices are activated to charge the charge into the shell without exposing it to air and batch-wise process it under controlled conditions. A rotary mill characterized by milling flour. 10. The milling member is a ball, and the charging material is nickel, copper, iron, chromium, aluminum, lithium, magnesium, titanium, yttrium, zinc, zirconium, niobium, carbon, silicon, molybdenum, vanadium,
The rotary mill according to claim 9, characterized in that it contains one or more elements selected from tin and rare earth group metals. 11. Claims characterized in that the milling member is a sphere, and the charging material is mainly composed of an element selected from nickel, copper, iron, titanium, magnesium, chromium, and aluminum. The rotary mill according to item 9. 12. Each part of the outer shell having the charging hole is attached to and removed from the outer shell, and the charging device is attached to the part of the outer shell having the charging hole. A rotary mill according to scope item 9. 13. Copper, nickel, zinc, titanium, zirconium, niobium, carbon, silicon, molybdenum, vanadium, tin,
aluminum, chromium, magnesium, lithium, iron,
Powder of an alloy containing a small amount to a large amount of yttrium or one or more rare earth group metals can be produced with an excellent dispersion rate using a batch-type rotary mill, and the rotary mill has a rotating hollow outer shell. and a rotating device for the outer shell, a charging hole provided in the outer shell for charging the charging material, and a charging device for charging the charging material into the outer shell, the charging device comprising: a charging device that is attached to the outer shell to cover the charging hole to seal the atmosphere of the charging hole and to charge the charging material; and a charging device that is attached with a seal to the charging device to feed the charging material. The charging device has a charging pipe for sealing the atmosphere and passing the charge material, and a valve device installed in the charging pipe for sealing the atmosphere. a plug valve, the charging conduit having a charge inlet and an outlet, the outlet aligned with the charging hole, and the valve device sealingly aligned with the charging hole; an opening device for moving the plug valve from the charging hole into the shell to open the charging hole; and a closing device for sealingly aligning the plug valve with the charging hole to close the charging hole. and the opening device and the closing device are activated when the charging device is sealing the atmosphere, so that the charging material can be charged into the outer shell without being exposed to air. Characteristic flour milling method. 14. The alloy powder includes nickel, copper, iron, titanium,
The milling method according to claim 13, characterized in that the main component is one or more elements selected from magnesium, chromium, and aluminum. 15. The powder milling method according to claim 13, wherein the alloy powder is made of aluminum.