WO1999055463A1 - Pulverizer mill slewing ring classifier vane adjustment system - Google Patents
Pulverizer mill slewing ring classifier vane adjustment system Download PDFInfo
- Publication number
- WO1999055463A1 WO1999055463A1 PCT/US1999/007893 US9907893W WO9955463A1 WO 1999055463 A1 WO1999055463 A1 WO 1999055463A1 US 9907893 W US9907893 W US 9907893W WO 9955463 A1 WO9955463 A1 WO 9955463A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vane
- classifier
- adjustment system
- lever
- ring
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
Definitions
- This invention relates to pulverizer mills, i.e. a pulverizer plant used for crushing coal or other minerals from a coarse aggregate state to a fine ground product (powder) .
- the pulverized product (powder) is transported from the mill by an air stream introduced beneath the grinding zone of the mill.
- the classifier forms an integral part of the pulverizer mill and performs the function of separating large particles from the product/air stream as it exits the mill.
- pulverizer mill The most common type of pulverizer mill is known as a "Vertical Spindle Mill" since its principle of operation relies upon the rotation of a horizontal table (i.e. bowl) mounted on a central vertical spindle within an enclosed casing.
- Raw material i.e. coarse aggregate coal/mineral
- rotating rollers or balls which are forced into contact with the table by an appropriate means of tensioning.
- the mill is normally pressurized by air introduced beneath its rotating table. This air stream enters the grinding zone around the table periphery and so carries crushed particles upwards to the classifier situated within the top of the mill casing.
- the classifier incorporates a ring of vanes suspended or supported vertically on individual spindles in the annular space between the mill casing and the classifier cone. The vane spindles protrude through glands or plain bushings at the top of the mill casing to provide a means of adjusting the vane position.
- the vanes impart a swirling motion to the product- laden air stream as it enters the classifier.
- the centrifugal force thus exerted on the crushed particles results in the larger of these particles being thrown outwardly to the sloping wall of the classifier cone. Accumulations of these larger particles then fall or slide down the inside of the classifier cone back into the mill's grinding zone for reprocessing, while the fine particles remain suspended in the air stream and are blown out from the mill through the exit opening.
- each vane determines the extent of classification and hence the quality (i.e. fineness) of the pulverized produc .
- the classifier vane setting in some installations is fixed and non-adjustable, while in other pulverizers adjustment is carried out by rotating the individual vane spindles one at a time by hand, in which case a pointer is fitted to each vane spindle to indicate vane position on an adjacent graduated scale mounted on the mill top. Each vane is locked in position when the required setting has been achieved.
- the slewing ring classifier vane adjustment system comprises:
- FIGURE 1 is a perspective view of a preferred embodiment of a slewing ring classifier vane adjustment system of the invention
- FIGURE 2 is a top view of the system shown in Figure 1;
- FIGURE 3 is a cross-sectional view taken along line 3- 3 in Figure 2 ;
- FIGURE 4 illustrates a pointer and scale for indicating the angular position of the vanes in the embodiment of the adjustment system shown in Figure 1.
- the slewing ring adjustment system 30 has been developed to enable simultaneous adjustment of the complete ring 20 of classifier vanes 14 on a mill classifier in one operation.
- Each housing 10 may be secured in position to the mill either by bolting or welding.
- Each lever arm 12 is secured to the external end of an individual vane spindle, such that movement of the arm rotates the spindle 11 and so alters the angular position of a vane 14.
- the opposite ends 12A of these arms 12 are drilled and slotted to accept a low friction, typically bronze bearing bush which can both rotate about, and slide along, the center line of the arm 12.
- the key component of the system is the slewing ring 20 which is used to connect together all the vane operating levers .
- This ring is usually fabricated from mild steel flat bar drilled radially to match the classifier vane spacing. The ring is positioned over the top of, and central to, the classifier casing 40.
- a leadscrew mechanism 22 (mounted on the mill top and connected to the ring by a pivot lever 24) is normally used to apply rotational movement about the mill center line CL to the slewing ring 20. Movement of the slewing ring is thus transmitted to the classifier vane spindles which rotate simultaneously to adjust all the vanes 14 to the required position in one operation, although a manual operating mode is also possible.
- a chain 25 extending around pulley 27 on leadscrew 22 facilitates rotation of the leadscrew.
- the mechanical slewing ring actuator is rigid and robust and can apply vane movement in either direction by hand and/or with a handwheel or from floor level using a chain as illustrated in the drawings.
- the actuator could easily be converted for conventional servo-motor operation, if desired.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
A slewing ring classifier vane adjustment system is described for use on a pulverizer mill having multiple vanes. The system enables all of the vanes to be pivotably adjusted simultaneously.
Description
Description
Pulverizer Mill Slewing Ring Classifier
Vane Adjustment System
Technical Field This invention relates to pulverizer mills, i.e. a pulverizer plant used for crushing coal or other minerals from a coarse aggregate state to a fine ground product (powder) .
Background Art The pulverized product (powder) is transported from the mill by an air stream introduced beneath the grinding zone of the mill. The classifier forms an integral part of the pulverizer mill and performs the function of separating large particles from the product/air stream as it exits the mill.
The most common type of pulverizer mill is known as a "Vertical Spindle Mill" since its principle of operation relies upon the rotation of a horizontal table (i.e. bowl) mounted on a central vertical spindle within an enclosed casing. Raw material (i.e. coarse aggregate coal/mineral) is fed onto the table and crushed by rotating rollers or balls which are forced into contact with the table by an appropriate means of tensioning.
The mill is normally pressurized by air introduced beneath its rotating table. This air stream enters the grinding zone around the table periphery and so carries crushed particles upwards to the classifier situated within the top of the mill casing.
The classifier incorporates a ring of vanes suspended or supported vertically on individual spindles in the annular space between the mill casing and the classifier cone. The vane spindles protrude through glands or plain bushings at the top of the mill casing to provide a means of adjusting the vane position.
The vanes impart a swirling motion to the product- laden air stream as it enters the classifier. The centrifugal force thus exerted on the crushed particles results in the larger of these particles being thrown outwardly to the sloping wall of the classifier cone. Accumulations of these larger particles then fall or slide down the inside of the classifier cone back into the mill's grinding zone for reprocessing, while the fine particles remain suspended in the air stream and are blown out from the mill through the exit opening.
The angular position of each vane (relative to a radial line drawn between the vane spindle and the vertical axis of the mill) determines the extent of classification and hence the quality (i.e. fineness) of the pulverized produc .
The classifier vane setting in some installations is fixed and non-adjustable, while in other pulverizers adjustment is carried out by rotating the individual vane spindles one at a time by hand, in which case a pointer is fitted to each vane spindle to indicate vane position on an adjacent graduated scale mounted on the mill top. Each vane is locked in position when the required setting has been achieved.
There has not heretofore been provided a vane adjustment system having the features and advantages provided by the present invention.
Disclosure of Invention In accordance with the present invention there is provided a slewing ring classifier vane adjustment system which overcomes the disadvantages and limitations of the previous methods for adjusting the individual vane positions. In a preferred embodiment, the slewing ring classifier vane adjustment system comprises:
(a) a plurality of vanes supported on vertical spindles ;
(b) a lever secured to each spindle for pivotably moving each spindle relative to its axis; (c) an annular ring attached to every said lever; and (d) means for angularly moving said ring in a manner such that each lever and associated vane is pivoted simultaneously. The features and advantages of the adjustment system of the invention will be apparent from the following detailed description and the accompanying drawings.
Brief Description of Drawings
The invention is described in more detail hereinafter with reference to the accompanying drawings, wherein like reference characters refer to the same parts throughout the several views and in which:
FIGURE 1 is a perspective view of a preferred embodiment of a slewing ring classifier vane adjustment system of the invention;
FIGURE 2 is a top view of the system shown in Figure 1;
FIGURE 3 is a cross-sectional view taken along line 3- 3 in Figure 2 ; and
FIGURE 4 illustrates a pointer and scale for indicating the angular position of the vanes in the embodiment of the adjustment system shown in Figure 1.
Best Mode for Carrying Out the Invention
In accordance with the invention, the slewing ring adjustment system 30 has been developed to enable simultaneous adjustment of the complete ring 20 of classifier vanes 14 on a mill classifier in one operation.
Steel bearing housings 10 with bronze (or other) bearings, normally packed with high temperature grease, are fitted at each vane spindle 11 penetration instead of conventional glands or seals. This simplifies operation and manufacture and results in a very easy-to-ad ust system. Each housing 10 may be secured in position to the mill either by bolting or welding.
Each lever arm 12 is secured to the external end of an individual vane spindle, such that movement of the arm rotates the spindle 11 and so alters the angular position of a vane 14. The opposite ends 12A of these arms 12 are drilled and slotted to accept a low friction, typically bronze bearing bush which can both rotate about, and slide along, the center line of the arm 12.
The key component of the system is the slewing ring 20 which is used to connect together all the vane operating levers . This ring is usually fabricated from mild steel flat bar drilled radially to match the classifier vane spacing. The ring is positioned over the top of, and central to, the classifier casing 40. Bearing bushes are fitted in the lever arm slots and pivot bolts 16 are passed through them and the slewing ring drillings, thus connecting all the vane operating levers together. Finally, a leadscrew mechanism 22 (mounted on the mill top and connected to the ring by a pivot lever 24) is normally used to apply rotational movement about the mill center line CL to the slewing ring 20. Movement of the slewing ring is thus transmitted to the classifier vane spindles which rotate simultaneously to adjust all the vanes 14 to the required position in one operation, although a manual operating mode is also possible. A chain 25 extending around pulley 27 on leadscrew 22 facilitates rotation of the leadscrew. Another preferred embodiment of the system of the invention is illustrated in Figure 4. It comprises a single pointer 28 and a scale 29 which gives an indication of the vane position. The scale and pointer are supported on brackets welded to the mill casing 40. There are many advantages of the slewing ring vane adjustment system of the invention, including:
(a) The complete ring of classifier vanes can be adjusted simultaneously by one operation to give an accurate, reliable and uniform setting throughout-indicated by a single pointer on an associated scale.
(b) Due to constraints imposed by original mill design, spindles may need to be offset from the vane center lines, giving an imbalance at their bearings which results in wear and difficulty in conventional vane adjustment. The slewing ring and associated lever system of this invention can normally be installed such that it counterbalances the vanes and hence alleviates this problem. (c) Friction is reduced and leakage of mill product- laden air at vane spindle casing penetrations is eliminated by use of bronze bearings packed with high temperature grease. Though the system of the invention is "low friction" and requires minimal force to operate, the mechanical slewing ring actuator is rigid and robust and can apply vane movement in either direction by hand and/or with a handwheel or from floor level using a chain as illustrated in the drawings. The actuator could easily be converted for conventional servo-motor operation, if desired.
Other variants are possible without departing from the scope of this invention.
Claims
1. A slewing ring classifier vane adjustment system comprising:
(a) a plurality of vanes supported on vertical spindles;
(b) a lever secured to each spindle for pivotably moving each spindle relative to its axis;
(c) an annular ring attached to every said lever;
(d) means for angularly moving said ring in a manner such that each lever and associated vane is pivoted simultaneously.
2. An adjustment system in accordance with claim 1, wherein said means for angularly moving said ring comprises a leadscrew and a lever having first and second ends, wherein said first end is attached to said leadscrew and said second end is attached to said annular ring.
3. An adjustment system in accordance with claim 2, further comprising (a) a pulley secured to said leadscrew, and (b) a flexible chain extending around said pulley.
4. In a pulverizer mill which includes a classifier and a plurality of vanes supported around the periphery of said classifier, the improvement which comprises a vane adjustment system comprising:
(a) a plurality of vanes supported on vertical spindles; (b) a lever secured to each spindle for pivotably moving each spindle relative to its axis;
(c) an annular ring attached to every said lever;
(d) means for angularly moving said ring in a manner such that each lever and associated vane is pivoted simultaneously.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU34892/99A AU3489299A (en) | 1998-04-29 | 1999-04-12 | Pulverizer mill slewing ring classifier vane adjustment system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8340998P | 1998-04-29 | 1998-04-29 | |
US60/083,409 | 1998-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999055463A1 true WO1999055463A1 (en) | 1999-11-04 |
Family
ID=22178130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/007893 WO1999055463A1 (en) | 1998-04-29 | 1999-04-12 | Pulverizer mill slewing ring classifier vane adjustment system |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU3489299A (en) |
WO (1) | WO1999055463A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8813967B2 (en) | 2012-05-02 | 2014-08-26 | Alstom Technology Ltd | Adjustable mill classifier |
CN104307754A (en) * | 2014-10-10 | 2015-01-28 | 上海凯盛节能工程技术有限公司 | Guide vane angle adjustment system related to powder concentrator |
WO2015082885A1 (en) * | 2013-12-02 | 2015-06-11 | Milling Plant Solutions Limited | Pulveriser mill |
CN110882761A (en) * | 2019-12-12 | 2020-03-17 | 江苏吉能达环境能源科技有限公司 | Vertical grinding roller structure for cement finish grinding |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB272111A (en) * | 1926-11-05 | 1927-06-09 | Otto August Kreutzberg | Improvements in or relating to pulverizers |
DE805345C (en) * | 1948-10-02 | 1951-05-17 | Steine Und Erden G M B H | Circulating air sifter |
DE3436074A1 (en) * | 1984-10-02 | 1986-04-10 | Andre Büechl, Kalk- und Portlandzementwerk Regensburg-Walhallastrasse, 8400 Regensburg | Air separator |
US4684069A (en) * | 1984-08-18 | 1987-08-04 | Kawasaki Jukogyo Kabushiki Kaisha | Classifier and controller for vertical mill |
US4689141A (en) * | 1985-06-03 | 1987-08-25 | F. L. Smidth & Co. A/S | Separator for sorting particulate material, with a plurality of separately adjustable guide vane sets |
FR2642994A1 (en) * | 1989-02-14 | 1990-08-17 | Fives Cail Babcock | Air-type separator with centrifugal action |
-
1999
- 1999-04-12 AU AU34892/99A patent/AU3489299A/en not_active Abandoned
- 1999-04-12 WO PCT/US1999/007893 patent/WO1999055463A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB272111A (en) * | 1926-11-05 | 1927-06-09 | Otto August Kreutzberg | Improvements in or relating to pulverizers |
DE805345C (en) * | 1948-10-02 | 1951-05-17 | Steine Und Erden G M B H | Circulating air sifter |
US4684069A (en) * | 1984-08-18 | 1987-08-04 | Kawasaki Jukogyo Kabushiki Kaisha | Classifier and controller for vertical mill |
DE3436074A1 (en) * | 1984-10-02 | 1986-04-10 | Andre Büechl, Kalk- und Portlandzementwerk Regensburg-Walhallastrasse, 8400 Regensburg | Air separator |
US4689141A (en) * | 1985-06-03 | 1987-08-25 | F. L. Smidth & Co. A/S | Separator for sorting particulate material, with a plurality of separately adjustable guide vane sets |
FR2642994A1 (en) * | 1989-02-14 | 1990-08-17 | Fives Cail Babcock | Air-type separator with centrifugal action |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8813967B2 (en) | 2012-05-02 | 2014-08-26 | Alstom Technology Ltd | Adjustable mill classifier |
WO2015082885A1 (en) * | 2013-12-02 | 2015-06-11 | Milling Plant Solutions Limited | Pulveriser mill |
CN104307754A (en) * | 2014-10-10 | 2015-01-28 | 上海凯盛节能工程技术有限公司 | Guide vane angle adjustment system related to powder concentrator |
CN110882761A (en) * | 2019-12-12 | 2020-03-17 | 江苏吉能达环境能源科技有限公司 | Vertical grinding roller structure for cement finish grinding |
CN110882761B (en) * | 2019-12-12 | 2021-02-26 | 江苏吉能达环境能源科技有限公司 | Vertical grinding roller structure for cement finish grinding |
Also Published As
Publication number | Publication date |
---|---|
AU3489299A (en) | 1999-11-16 |
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