JPS6048227B2 - Ball for grinding mill - Google Patents
Ball for grinding millInfo
- Publication number
- JPS6048227B2 JPS6048227B2 JP7325278A JP7325278A JPS6048227B2 JP S6048227 B2 JPS6048227 B2 JP S6048227B2 JP 7325278 A JP7325278 A JP 7325278A JP 7325278 A JP7325278 A JP 7325278A JP S6048227 B2 JPS6048227 B2 JP S6048227B2
- Authority
- JP
- Japan
- Prior art keywords
- ball
- casting
- grinding mill
- hollow
- hollow ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Crushing And Grinding (AREA)
Description
【発明の詳細な説明】
この発明は石炭等を微粉に粉砕する粉砕ミル用ボール
の構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a ball for a grinding mill that grinds coal or the like into fine powder.
上下に対向する２つのリングの間に位置しリング溝内
を前記リングの回転により転動し石炭を粉砕するミル用
のボールは、その円滑な回転と粉砕効率の点よりして耐
摩耗の合金鋳鋼製中空ボールが使用されている。Balls for mills, which are located between two rings that face each other vertically and roll in a ring groove as the rings rotate to crush coal, are made of wear-resistant alloys in terms of smooth rotation and crushing efficiency. A cast steel hollow ball is used.
石炭の粉砕能力に応じ１２インチ（３０４．８Ｔｆｒ！
ｎ）乃至３０インチ（７６２ｗｕ−１１）径肉厚３１．
６−乃至１２４ｗＬの形状の粉砕ミル用鋳鋼製中空ボー
ル（以下単に中空ボールと称する）は１台のミルに複数
個使用されている。 従来このような中空ボールの鋳造
のために球状の中子をつくり、これを支持棒（巾木）て
型枠に支持して鋳造していた。12 inches (304.8 Tfr!) depending on the coal crushing capacity.
n) to 30 inches (762wu-11) diameter wall thickness 31.
A plurality of cast steel hollow balls for grinding mills (hereinafter simply referred to as hollow balls) having a shape of 6 to 124 wL are used in one mill. Conventionally, in order to cast such hollow balls, a spherical core was made, and this was supported in a mold using support rods (baseboards) for casting.
そのため中子の砂を取り出したあとの巾木用孔は鋼製丸
棒で埋め溶接していた。しかし耐摩耗性の材料にねじ切
りしかつ溶接することは加工自体も相当困難を伴いまた
この穴埋め部より運転中に亀裂が入り運転停止せねはな
らぬ等の問題があつた。 このため発明者等はさきにこ
の巾木保持をする中空ボール壁部を部分的に厚肉にしま
たは突起ボス部を設け補強し、巾木保持用穴は開放のま
まて使用することを提案した。Therefore, after removing the sand from the core, the baseboard holes were filled with steel round rods and welded. However, cutting and welding threads on a wear-resistant material involves considerable difficulty in the processing itself, and there are also problems such as cracks occurring during operation from the hole-filling portion, requiring the operation to be stopped. For this reason, the inventors first proposed that the hollow ball wall that holds the baseboard be partially thickened or provided with a protruding boss to reinforce it, and that the baseboard holding hole be left open. .
また一方において中空ボールは肉厚が均等であること
が要望されるものである。On the other hand, the hollow ball is required to have a uniform wall thickness.
これは通称ストリップバンドと呼ばれるある巾の磨耗の
帯が中空ボールに巻かれた状態になる一つの原因をなし
ており肉厚の均等であることが強く要望されるものであ
る。この肉厚の不均等は鋳造後には修正でき難いという
ところに問題がある。 この発明は均等肉厚をもつ耐磨
耗の粉砕ミル用ボールの構造を提案するものである。This is one of the reasons why a wear band of a certain width, commonly called a strip band, is wound around the hollow ball, and it is strongly desired that the wall thickness be uniform. The problem is that this uneven thickness is difficult to correct after casting. This invention proposes the structure of a wear-resistant grinding mill ball having a uniform wall thickness.
要するにこの発明は中空ボールが発明者の定める中空
ボール内径と補強された開放の鋳造用孔の径との比率を
もち、かつこの開放鋳造用孔数を少くとも４個にする粉
砕ミル用ボールの構造であることを特徴とする。In short, this invention provides a ball for a grinding mill in which the hollow ball has a ratio of the inner diameter of the hollow ball to the diameter of the reinforced open casting hole determined by the inventor, and the number of open casting holes is at least four. It is characterized by a structure.
この発明にかかる粉砕ミル用の中空ボールの構造を図
面により説明する。The structure of the hollow ball for a grinding mill according to the present invention will be explained with reference to the drawings.
第１図は中空ボールの中心を含む断面図と鋳造時の巾木
の断面を示すものである。中空ボール１の鋳造には中空
にするため鋳物用砂を球状に固めた中子２が使用される
。従来この中子２を支えるのには一本の巾木３ａを使用
し鋳造していた。これは中空ボルの壁１ａにできるだけ
孔の数を少くし鋳孔の充填、溶接による欠陥の発生を少
なくしようとする配慮によるものである。また鋳造に際
しては巾木３ａを下部鋳型４ａで支え、これに上部鋳型
４ｂをのせ、鋳孔をかねる押湯５より溶融鋳鋼をつぎこ
むものである。この場合鋳鋼の比重は７．＆鋳物砂の見
掛比重が１．５てあることより中子２は「体積×（７．
８−１．５）」の浮力を受けることとなる。また溶湯の
温度は高温（鉄の融点は１５３５゜Ｃ）であることから
溶湯に接触する巾木部の温度上昇は大である。芯金６の
温度が８００゜Ｃ以上になるとヤング率の低下は急速に
大となることと中子が上方に浮き上り変位する力を受け
ることにより中空ボール肉厚に偏肉を生ずることとなる
。また鋳造後のの偏肉（基準値に対して）３ｍ７７Ｉま
では使用上差支えないと許容し修正加工することができ
る。この発明は発明者等が先に提案したごとく鋳造用孔
を開放孔として使用し、中空部に被粉砕物か充填された
状態て使用することを考慮し巾木の数を２本とし鋳造す
る中空ボールの構造を提案するものである。FIG. 1 shows a cross-sectional view including the center of the hollow ball and a cross-section of the baseboard during casting. To cast the hollow ball 1, a core 2 made of foundry sand hardened into a spherical shape is used to make the ball hollow. Conventionally, a single baseboard 3a was used to support the core 2 during casting. This is done in consideration of minimizing the number of holes in the wall 1a of the hollow bowl to reduce the occurrence of defects due to filling of the casting holes and welding. Further, during casting, the baseboard 3a is supported by a lower mold 4a, an upper mold 4b is placed on this, and molten cast steel is poured through a riser 5 which also serves as a casting hole. In this case, the specific gravity of cast steel is 7. & Since the apparent specific gravity of the foundry sand is 1.5, the core 2 is ``volume x (7.
8-1.5)". Furthermore, since the temperature of the molten metal is high (the melting point of iron is 1535°C), the temperature of the baseboard that comes into contact with the molten metal increases significantly. When the temperature of the core metal 6 exceeds 800°C, the decrease in Young's modulus increases rapidly, and the core lifts upward and receives a force that causes the hollow ball to have an uneven wall thickness. . In addition, it is possible to accept and correct a thickness deviation of up to 3m77I (relative to the standard value) after casting, as it does not pose a problem in use. In this invention, as previously proposed by the inventors, the casting hole is used as an open hole, and the number of baseboards is set to two for casting, considering that the hollow part is filled with the material to be crushed. We propose a hollow ball structure.
しかし、一方において、開放孔の直径はできるだけ小さ
いことが望ましいのは言うまでもない。However, on the other hand, it goes without saying that it is desirable that the diameter of the open hole be as small as possible.
また前述の鋳造時に生ずる偏肉を最小にするため巾木の
曲け抵抗が大になる２本の巾木を使用し、かつ７６２７
７Ｚ７７！ボールにおいて巾木芯金の径をそれぞれ２５
７７！７７１φと３８７−！ＵＴＬφとし直交しかつ接
触して中子に取付けすることを提案するものてある。ま
た芯金の温度上昇を８００゜Ｃ以下にするため約２０〜
２５７７Ｚ７７１（７）−厚みに芯金を鋳物砂で囲み棒
状の巾木３ａ，３ｂをつくるものである。またこの鋳物
砂で包囲した部分には第３図に示すごとく約１０Ｔ１Ｕ
ｎφのガス抜き孔７を２個設けるとよい。巾木３ａ，３
ｂは第１図、第２図に示すごとく直交して位置させ、鋳
造用孔８の孔数は４個とし発明者が先に提案したごとく
鋳造後には開放された鋳造用孔８となる部分の内壁側に
ボス状突起である補強突起９を設けるものである。実用
試験の結果、開放された鋳造用孔８の直径ｄは中空ボー
ル１の内径Ｄの約１５％にすることが製造上及び耐磨耗
の点においても良いことが判つた。In addition, in order to minimize the uneven thickness that occurs during casting as mentioned above, two baseboards with high bending resistance are used, and 7627
7Z77! In the ball, the diameter of the baseboard core metal is 25
77!771φ and 387-! There is a proposal to attach the UTLφ to the core so that they are perpendicular to each other and in contact with each other. In addition, in order to keep the temperature rise of the core metal below 800°C,
2577Z771(7)--A core metal is surrounded with foundry sand to make rod-shaped baseboards 3a and 3b. In addition, the area surrounded by this foundry sand has approximately 10T1U as shown in Figure 3.
It is preferable to provide two nφ gas vent holes 7. Baseboard 3a, 3
b are positioned orthogonally to each other as shown in FIGS. 1 and 2, and the number of casting holes 8 is four, and as previously proposed by the inventor, the portion that becomes the open casting hole 8 after casting. A reinforcing projection 9, which is a boss-like projection, is provided on the inner wall side. As a result of practical tests, it was found that setting the diameter d of the opened casting hole 8 to about 15% of the inner diameter D of the hollow ball 1 is good in terms of manufacturing and wear resistance.
この発明を実施することにより、耐磨耗性の大なる中空
ボールを前述の４個の開放された鋳造用孔をもつ構造と
し、その孔径は中空ボールの内径の約１５％とし製作容
易なかつ均質な粉砕ミル用ボールを提供しミルの長期連
続運転を可能にするという効果を奏せしめるものである
。By carrying out this invention, a hollow ball with high wear resistance is made into a structure having the above-mentioned four open casting holes, and the hole diameter is approximately 15% of the inner diameter of the hollow ball, making it easy to manufacture and uniform. The present invention provides balls for use in a grinding mill, and has the effect of enabling long-term continuous operation of the mill.
第１図はこの発明にかかる粉砕ミル用ボールの鋳造時に
おける巾木を含む断面図、（第２図のＢ−Ｂ断面視図）
、第２図は第１図のＡ−Ａ断面視図、第３図は第２図の
巾木のＣ−Ｃ断面でガス抜孔を示す図面である。
１ ・・・粉砕ミル用ボール（中空ボール）、２ ・・
・中子、３ａ，３ｂ・・・巾木、４ａ・・・下部鋳型、
４ｂ・・・上部鋳型、５ ・・・押湯、６ ・・・芯金
、７ ・・・ガス抜き孔、８ ・・・鋳造用孔、９ ・
・・補強突起、ｄ・・・鋳造用孔の直径、Ｄ・・・中空
ボールの内径。FIG. 1 is a sectional view including a baseboard during casting of a ball for a grinding mill according to the present invention, (a sectional view taken along line B-B in FIG. 2)
, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line C-C of the baseboard in FIG. 2, showing gas vent holes. 1...Ball for grinding mill (hollow ball), 2...
- Core, 3a, 3b...baseboard, 4a...lower mold,
4b... Upper mold, 5... Riser, 6... Core metal, 7... Gas vent hole, 8... Casting hole, 9.
...Reinforcement projection, d...Diameter of casting hole, D...Inner diameter of hollow ball.
Claims (1)
ものにおいて、開放されている鋳造用孔数を少なくとも
４とすることを特徴とする粉砕ミル用ボール。 ２ 開放されている鋳造用孔の直径を中空ボールの中空
部直径の約１５％にしたことを特徴とする特許請求の範
囲第１項記載の粉砕ミル用ボール。[Scope of Claims] 1. A grinding mill hollow ball made of cast steel and having casting holes, characterized in that the number of open casting holes is at least four. 2. The ball for a grinding mill according to claim 1, wherein the diameter of the open casting hole is approximately 15% of the diameter of the hollow part of the hollow ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7325278A JPS6048227B2 (en) | 1978-06-19 | 1978-06-19 | Ball for grinding mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7325278A JPS6048227B2 (en) | 1978-06-19 | 1978-06-19 | Ball for grinding mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS551820A JPS551820A (en) | 1980-01-09 |
| JPS6048227B2 true JPS6048227B2 (en) | 1985-10-25 |
Family
ID=13512791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7325278A Expired JPS6048227B2 (en) | 1978-06-19 | 1978-06-19 | Ball for grinding mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6048227B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60104419A (en) * | 1983-11-12 | 1985-06-08 | Aisin Seiki Co Ltd | Automatic opening/closing device of opening cover member |
| CN103464682B (en) * | 2013-07-10 | 2015-11-18 | 马鞍山市海天重工科技发展有限公司 | A kind of preparation method of hollow abrading-ball |
| CN103639363B (en) * | 2013-12-27 | 2014-08-13 | 马鞍山市海天重工科技发展有限公司 | Preparation method of large abrasion-proof hollow grinding ball |
-
1978
- 1978-06-19 JP JP7325278A patent/JPS6048227B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS551820A (en) | 1980-01-09 |
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