CN1189109A

CN1189109A - Ring roller mill

Info

Publication number: CN1189109A
Application number: CN 96195038
Authority: CN
Inventors: 扬·弗尔斯堡
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1995-07-04
Filing date: 1996-05-29
Publication date: 1998-07-29

Abstract

The invention relates to a ring roll mill working at a subcritical speed, which comprises at least one external lap and at least one roller arranged in the external lap. The ring roll mill can be used to mill slag, sprue and similar material when cement is manufactured. The invention is to provide a ring roll mill which can eliminate undesired vibration or prevent the roller from running on the skew through installing an impact and configuration device. The device is arranged on a way, through which a compressible separation ring falls into an inflow area. During milling, the impact and configuration device breaks up coagula, and at the same time, the even layer of bulk material is arranged in the inflow area. When a material impact device is arranged between the angle of 60 degrees and the angle of 100 degrees, the maximum impact can be obtained.

Description

Ring roll mill

The present invention is about a kind of ring roll mill that is operated under the subcritical speed, and it comprises at least one bull ring, and at least one is contained in roller in the bull ring and at least one and is contained in device between roller and the bull ring.

This grinder grinds slag material, slag and similar material as an example when can be used for making cement.

In disclosed european patent application No.486371, a kind of ring roll mill has been described.In this grinder, input material installs to the space of grinding route the place ahead, and it is subjected to centrifugal action at this.After this material and air axially pass grinder.Bull ring that is to say that grinding pressure for working between the 10-40MPa and under the supercritical state material that stands to grind always is retained on the bull ring in this grinder.Therefore, might also be necessary in ring, to load onto scraper plate, thereby material is separated from the passage perpendicular to bull ring.Scraper plate can be tilting, and they can guiding material be advanced in the direction of material source along roller.

In the ring roll mill on being operated in subcritical speed, grinding-material will only be stayed on the part bull ring, in a certain zone of bull ring, rotating speed, the roughness of ring surface and the characteristic of rapidoprint according to ring, grinding-material will leave from ring, continue to fall to the inflow district in roller the place ahead along downward route.

The even distribution of material on inflow district and grinding machine is far reaching to the work of grinder.The great change of grinding machine thickness will make the undesired or generation vibration of grinder work, and the moment of drive unit is fluctuateed.The inhomogeneous loading of roller can cause that also the part on protection bull ring surface is worn, and will damage roller.

The intensity of added grinding pressure and the type of grinding-material are to determine the decisive factor of pressurized material by the form behind the passage of grinder roller.The shape that high grinding pressure and/or cohesive material will cause material to keep them from bull ring discharging back forms assembles, and low grinding pressure will make the material that falls relatively loose and broken.Size of assembling and hardness will influence and have the work that flows into the material bed smooth and lapping machine in district.

The ring roll mill that is operated on the subcritical speed is lower than the rotating speed that is operated in the grinder on the supercritical state.For the output that increases the grinder on the subcritical speed makes it to reach or be similar to the output that is operated in the grinder on the supercritical state, just must increase pressure.The grinding pressure that is usually operated at the grinder on the subcritical speed will be higher than 50MPa.

The purpose of this invention is to provide a kind of ring roll mill, the coalescent fragmentation that wherein forms in running also distributes along flowing into the district, can not produce undesirable vibration in the running middle roller like this, also needn't obliquely place.

According to the present invention, above-mentioned purpose is reached by a kind of surprising method: the internal unit that a bump and inking device form are installed in grinder.These devices are placed on P point a distance on the ring path, make compression material fall to leaving this ring, flow into the district to falling into.

In the process of grinding, bump and inking device will be pulverized coalescent, and the form with even one deck will arrive the inflow district with loose material configuration simultaneously.Between material is with 60 ° and 120 °, can obtain maximum bump when preferably percussion device is surperficial between 70 ° and 110 °.

This device needn't have whole surface, and this is one of its advantage, and this device has the surface or the gridiron structure of porous.

If material is to send into symmetrically by the openings at two ends of grinding ring, the coalescent middle part that may mainly appear at grinding ring of material, therefore, bump and inking device can roughly be made such profile, promptly in their comminution of material, the sidepiece of most of material towards grinding ring shifted.

Explain the present invention in further detail now with reference to accompanying drawing.

The cross section of Fig. 1 representative ring roller mill,

Fig. 2 A-D represents to clash into the different profiles with inking device, and the visual angle is the side of material impact plate and the length tangent plane of beam 8.

Grinder shown in Figure 1 has grinding ring 1 and roller 2, and roller 2 and grinding ring 1 are rotated by a unshowned drive unit, and roller 2 leans against on the grinding ring 1 by clamping system pushing.Between roller 2 and grinding ring 1, the material of partial crushing constitutes the space 4a in lapping machine 4 and roller the place ahead, sends into material from the 4a district and flows to compress, and this district is referred to as to flow into the district.

By behind the below of roller, will be pressed into solid block from the discrete material that flows into the district usually, and be retained in and upwards arrive the P point on the ring, material begins to fall towards flowing into the district in this.

Position P depends primarily on the speed of grinding ring and the type of grinding-material.

The compression material that device 3a is placed in the grinder falls on the path that flows into the district.As an example, this device can be fixed by the device of beam 8 classes of passing grinder, so just may or rotate this device and regulate the upright position of this device and the angle on grinding-material percussion mechanism surface by swing.The position of this device and can regulate from the outside with the angle of vertical direction this means that the adjusting of device location can be regulated when material grinds in grinder.In order to reach the purpose of best percussion device and first-class percussion device, this device is placed at least from the P point and is at least the 1/4d place, is preferably the 1/3d place, and d is the internal diameter of grinding ring here.

Device 3a will pulverize coalescent, and loose material configuration is distinguished 4a to roller and inflow.

Device 3b and 3c represent the replacement position in the grinder, and be that keep to the side in the limit or vertical off setting if some suitable devices can be installed simultaneously, just may strengthen the accurate configuration of grinding-material.

Fig. 2 A represents the device of one flat plate 6 configurations, and it can not dispose material on any particular orientation, only makes loose material and the usefulness of pulverizing coalescent opened.

Fig. 2 B represents a device with flat board 6 configurations of end 5.This end guarantees that impact groove opens to the material of restricted device is loose, and make their downwards guiding fall into and flow into the district.Dull and stereotyped axial width will be corresponding with roll width usually.

Fig. 2 C and 2D represent to have the device of convex area 7 configurations, the roughly similar ridge of the shape of Fig. 2 C.In this configuration, material is distributed towards sidepiece from the middle part of grinding ring, and this material in process of lapping is favourable when having the tendency that accumulates in the grinding ring middle part.

As Fig. 2 C and the 2D device size of example, promptly axial dimension is a key factor of determining final processing back materials behavior curve, and this size has important definition to the cycle-index of material in grinder.Therefore little ridge will stand some process of lapping owing to same material does not have intermediate section from causing smooth particle distribution curve, and the ridge of broad will cause bigger mixing, and effectively separates and steeper particle size distribution curve.

When material grinds in according to ring roll mill of the present invention, material will be sent into grinder by passing one of one or two fixture or some inlet tubes, fixture is installed in the end of grinding ring 1, and guiding makes material flow into the inflow district that grind the roller below.Along with grinding-material increases gradually, material is pulled on the collection edge of grinding ring 1, and circulation is ground again again in grinder, or is directed to by the stiff end output of airflow apparatus by grinder grinding ring 1 end, processes again in other place.

Claims

1. ring roll mill that is operated on the subcritical speed, comprise at least one grinding ring (1), at least one is contained in roller (2) in the grinding ring and at least one and is contained in device (3) between roller (2) and the grinding ring (1), material is percussion mechanism (3) after discharging from grinding ring, it is characterized in that from the material of grinding ring release, in angle [alpha] is to impact this device between 60 ° and 120 °, and wherein α is an angle between plate surface and the material impact direction.

2. according to the ring roll mill of claim 1, it is characterized in that grinding pressure surpasses 40MPa.

3. according to the ring roll mill of claim 1, it is characterized in that grinding pressure is between 60-100Mpa.

4. according to the ring roll mill of claim 1, it is characterized in that device (3) is one or some blocks of plates complete or with holes.

5. according to the ring roll mill of claim (2), it is characterized in that device (3) is made up of the plate of some vertical off settings.

6. according to the ring roll mill of claim 2 or 3, it is characterized in that having at least on one or several devices a zone (6) with respect to the planar surface projection, the material of so most of percussion mechanism (3) guiding flows into district (4a) and roller (2) is gone up the shock point axialy offset of material with respect to installing (3).

7. according to the ring roll mill of claim 4, it is characterized in that convex area (6) has the configuration of similar ridge or homologue.

8. according to the ring roll mill of claim 1-5, it is characterized in that device (3) is equipped with end (5), this end is positioned on the outermost of device, points to the anchor end wall direction.