JPS6236524Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は、乾式の塔式粉砕機（タワーミル）の
改良に関する。[Detailed description of the invention] This invention relates to an improvement to a dry tower mill.

乾式の塔式粉砕機は、例えば、特公昭39−5584
号「乾式塔式摩砕粉砕機」にも開示された公知の
粉砕機である。この粉砕機は第１図、第２図に示
すように、閉鎖円塔１内の中心に軸があり、この
軸にスクリユー３が取り付けられており、ギヤー
ドモータ４によりスクリユー３を内容物を持ちあ
げる向きに回転させる。給鉱はロータリーバルブ
５によつて粉砕機内に定量供給する。給鉱物同士
で粉砕を行わせることもあるが、通常鋼球などの
粉砕媒体を粉砕機内に充填しておく。給鉱された
被粉砕物は、粉砕媒体とともに、スクリユー３に
よつて持ち上げられ、壁に沿つて落下し、この
間、粉砕媒体と被粉砕物とのすり合わせによる摩
砕作用により粉砕される。以下この粉砕された産
物を粉末という。 The dry tower type crusher is, for example,
This is a known pulverizer also disclosed in No. ``Dry Tower Type Attrition Pulverizer''. As shown in Figures 1 and 2, this crusher has a shaft at the center of a closed circular column 1, a screw 3 is attached to this shaft, and a geared motor 4 moves the screw 3 to hold the contents. Rotate it in the upward direction. The feed ore is supplied in a constant quantity into the crusher by a rotary valve 5. Although pulverization is sometimes carried out using feed minerals, the pulverizer is usually filled with a pulverizing medium such as steel balls. The fed material to be crushed is lifted up by the screw 3 together with the grinding medium and falls along the wall, during which time it is pulverized by the grinding action of the grinding medium and the material to be crushed. Hereinafter, this pulverized product will be referred to as powder.

粉末は粉砕機外に排出されるが、第１図の粉砕
機においては、送風機６による粉砕機内の上昇気
流に同伴されて上方から排出され、サイクロン２
で捕集される。気流は送風機６から再び粉砕機に
至り循環する。第２図の粉砕機にあつては、粉末
は粉砕機下端部からスリツト（図示してない）を
経て送風機６からの気流に抽かれて粉砕機外に排
出されバグフイルタ７で捕集される。 Powder is discharged outside the crusher, but in the crusher shown in FIG.
It is collected in The airflow is circulated from the blower 6 to the crusher again. In the pulverizer shown in FIG. 2, the powder passes through a slit (not shown) from the lower end of the pulverizer, is drawn by an air flow from a blower 6, is discharged outside the pulverizer, and is collected by a bag filter 7.

以上の従来の塔式粉砕機では、被粉砕物の給鉱
供給量が一定であつても排出量が一定せず、被粉
砕物が粉砕媒体の隙間に充填する充填量、充填密
度等により粉砕機内の通風抵抗が大きく変動し、
排出量にむらがあるばかりでなく、時として充填
量の異常な増加のため連続運転が不能となつた
り、送風機動力の異常変動が発生したりする欠点
があつた。 In the conventional tower-type crusher described above, even if the feed amount of the material to be crushed is constant, the discharge amount is not constant, and the material to be crushed is crushed depending on the filling amount and packing density of the material to be crushed into the gaps between the crushing media. The ventilation resistance inside the aircraft fluctuates greatly,
Not only was the amount of discharge uneven, but there were also drawbacks such as an abnormal increase in the amount of filling that sometimes made continuous operation impossible or abnormal fluctuations in the power of the blower.

本考案者らは下端から粉末を抜き出す塔式粉砕
機についてこの原因を探究したところ円塔の下部
には、粉末の部分的な停滞が見られ、これが排出
不良や粉砕物の粒度分布及び粉砕効率等に少なか
らぬ悪影響を与えていることが判つた。 The present inventors investigated the cause of this problem in a tower-type pulverizer that extracts powder from the lower end, and found that there was partial stagnation of powder at the bottom of the column. It was found that this had a considerable negative impact on

本考案者らはこれらの欠点を改善すべく研究を
重ね、粉末抜き出し口を複数個有する塔式粉砕機
を開発した。 The inventors of the present invention have conducted extensive research to improve these drawbacks, and have developed a tower-type pulverizer that has multiple powder outlet ports.

本考案は、閉鎖円塔下部から粉末を抜き出す塔
式粉砕機において、抜き出し口を円塔外周に複数
個等間隔に配置し、粉末の部分的停滞を排除する
ことによつて粉砕機運転の安定、粉砕粒度の安定
化および粉砕効率の向上を図るものである。なお
この場合、粉末の抜き出しは第２図に示すような
送風機による抜き出し或は送風機を用いない抜き
出しの何れでもよい。また抜き出し口の数は理論
的には多い程良いわけであるが、抜き出し後の輸
送設備が複雑となるので、輸送設備との兼ね合い
で適当な複数個を定めればよい。 This invention is a tower-type crusher that extracts powder from the lower part of a closed circular column.The present invention stabilizes the operation of the crusher by arranging multiple extraction ports at equal intervals around the outer circumference of the circular column and eliminating partial stagnation of the powder. This aims to stabilize the pulverized particle size and improve the pulverization efficiency. In this case, the powder may be extracted either by using a blower as shown in FIG. 2 or without using a blower. Theoretically, the larger the number of extraction ports, the better, but since the transportation equipment after extraction becomes complicated, an appropriate number may be determined in consideration of the transportation equipment.

次に本考案の実施例を図面によつて説明する。 Next, embodiments of the present invention will be described with reference to the drawings.

第３図、第４図は本考案の一実施例を示し、第
３図は一部断面側面図、第４図は一部断面平面図
である。この実施例は同一寸法の粉末抜き出し口
を２個、円塔１の中心軸に対して対称に配し、そ
れぞれ同一仕様の、スリツト９，９ａ、傾斜ダク
ト１２，１２ａ、鉄砲型スクリユーコンベヤー１
０，１０ａを接続配置させ、これら２系列のスク
リユーコンベヤーは集合スクリユーコンベヤー１
３と接続されている。なおスクリユーコンベヤー
１０，１０ａはそれぞれ可変速運転可能なものを
使用した。 3 and 4 show an embodiment of the present invention, with FIG. 3 being a partially sectional side view and FIG. 4 being a partially sectional plan view. In this embodiment, two powder outlet ports of the same size are arranged symmetrically with respect to the central axis of the circular tower 1, and each has the same specifications as the slits 9, 9a, the inclined ducts 12, 12a, and the gun-type screw conveyor 1.
0 and 10a are connected and arranged, and these two series of screw conveyors are connected to the collective screw conveyor 1.
3 is connected. The screw conveyors 10 and 10a were capable of variable speed operation.

次に具体例を挙げてさらに説明する。Next, a specific example will be given to further explain the method.

円塔直径1170mmφの粉砕機に27mmφの鋼球9500
Kgを充填し、0.5mm以上が80％の粒度の高炉水砕
スラグを粉砕し、ブレーン値4000±100cm²／grの
粉末を得た。この試験の結果、従来型の１方向の
みの粉末取り出し口を備えた粉砕機と比較して粉
砕能力で約10％の増加を確認することができた。
この粉砕能力の増加の原因は次の通りである。即
ち従来型の１方向のみの抜き出しの際は円塔軸に
対し、抜き出し口と対称の側の円塔下部に滞留す
る粉体は抜き出し口から遠いために停滞し、粉体
圧が高くなり粉砕媒体が浮上がり気味となり、粉
砕媒体間の粉砕能力が下つていたものと思われ
る。 27mmφ steel balls 9500 in a crusher with a circular tower diameter of 1170mmφ
Granulated blast furnace slag with a particle size of 80% of 0.5 mm or more was crushed to obtain powder with a Blaine value of 4000±100 cm ² /gr. As a result of this test, we were able to confirm an approximately 10% increase in grinding capacity compared to a conventional grinder equipped with a powder outlet in only one direction.
The reasons for this increase in crushing capacity are as follows. In other words, when extracting in only one direction with the conventional method, the powder that stays at the bottom of the column on the side symmetrical to the outlet with respect to the column axis is far from the outlet and stagnates, causing the powder pressure to increase and crushing. It is thought that the media seemed to be floating, and the grinding ability between the grinding media was decreasing.

従つて、抜き出し口を多くとる程粉体停滞の原
因は少なくなり、また抜き出し口を円周上等間隔
に配置することにより、運転状態の平衡を保ちや
すくすることができる。 Therefore, the more outlets there are, the fewer the causes of powder stagnation, and by arranging the outlets at equal intervals on the circumference, it is possible to maintain a balanced operating state.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図、第２図は乾式の塔式粉砕機の説明図で
あり、何れも粉砕物を気流式で排出するもの、第
３図、第４図は本考案の実施例の下部抜き出し式
塔式粉砕機の断面側面図および断面平面図であ
る。 １……閉鎖円塔、２……サイクロン、３……ス
クリユー、４……ギヤードモータ、５……給鉱用
ロータリーバルブ、６……送風機、７……バグフ
イルタ、９，９ａ……スリツト、１０，１０ａ…
…スクリユーコンベヤー、１２，１２ａ……ダク
ト（シユート）、１３……搬送用スクリユーコン
ベヤー。 Figures 1 and 2 are explanatory diagrams of a dry tower-type crusher, both of which discharge the pulverized material using an air flow system, and Figures 3 and 4 are diagrams of a lower extraction type tower according to an embodiment of the present invention. FIG. 2 is a cross-sectional side view and a cross-sectional plan view of a type crusher. 1...Closed circular tower, 2...Cyclone, 3...Screw, 4...Geared motor, 5...Rotary valve for ore feeding, 6...Blower, 7...Bug filter, 9, 9a...Slit, 10 ,10a...
...Screw conveyor, 12, 12a...Duct (shute), 13...Screw conveyor for conveyance.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 閉鎖円塔と、その中心で回転する軸と、該軸に
取り付けたスクリユーとから成り、該円塔下端部
に粉末抜き出し装置を設けてなる塔式粉砕機にお
いて、粉末の抜き出し口を円塔外周に複数個設け
たことを特徴とする塔式粉砕機。 In a tower-type crusher that consists of a closed circular column, a shaft that rotates at the center, and a screw attached to the shaft, and a powder extraction device is provided at the lower end of the circular column, the powder extraction port is located at the outer periphery of the column. A tower-type crusher characterized by having multiple units installed.