CN102421527A

CN102421527A - Method for controlling the material feed to a roller mill and such similar mills

Info

Publication number: CN102421527A
Application number: CN2010800203025A
Authority: CN
Inventors: A.赫尔姆; B.霍宁
Original assignee: FLSmidth AS
Current assignee: FLSmidth AS
Priority date: 2009-04-01
Filing date: 2010-03-30
Publication date: 2012-04-18
Anticipated expiration: 2030-03-30
Also published as: BRPI1014057A2; CN102421527B; WO2010113119A1; TW201043336A

Abstract

A description is given of a method for controlling the material feed to a roller mill for continuous grinding of particulate material, such as cement raw materials, cement clinker and similar materials, which roller mill comprises a substantially horizontal grinding table (1) and a number of rollers (2) operating interactively therewith, said rollers rotating about separate roller shafts (3) which are connected to a vertical central shaft (4) via a hinged connection (5) allowing a free circular movement of the roller up and down in a plane comprising the centreline (6) of the roller shaft, where material to be ground is continuously fed to the roller mill, with ground material being continuously diverted from the roller mill. The method is peculiar in that an angle ( a ) between at least one of the roller shaft centrelines (6) and a reference line (18) is measured and used as an input signal for a control circuit for controlling the material feed. Hereby is obtained a fast and adequate control of the material feed which takes due account of the immediate operating environment in the roller mill in terms of material charge, ie the amount of material present in the roller mill at any given time. This is due to the fact that variations in the angular positions of the roller shafts will provide a prompt and significant indication of any tendency towards overfilling or emptying of the mill.

Description

Be used to control method and the similar milling train that material is fed into roller

Technical field

The present invention relates to be used for material is fed into roller (roller mill) so that the granular material such as cement slurry, cement clinker and similar material is continued abrasive method; This roller comprises the grinding table of basic horizontal and the roller (roller) of a plurality of and its interactive operation; Said roller rotates around the roll shaft separately that is connected to via articulated elements on the vertical central shaft; Rotate up and down to allow roller on the plane that comprises this roll shaft center line, to make freedom; Material to be ground herein is fed in the roller constantly, and is transferred from roller constantly through the material that grinds.The invention still further relates to the roller that is used to carry out this method.

Background technology

Can recognize aforementioned this roller type by for example 2.061.422 number German publication application.This known milling train (mill) is configured to roller group rotation under the grinding table halted state; And in addition; It also has batch type (portion type); This means it can't operate continuously, but operates with mode in batches, promptly it comprise each replenish, processing and a material of emptying.In addition; Can learn the lasting grinding to granule materials by other roller, these rollers comprise, are used for material is continued to be fed into the device of roller; With being used for the device of grinding material from the lasting transfer of roller for example passed through to introduce via nozzle ring the method for air stream.These take the common trait of the lasting roller that grinds to be; They need be fed into milling train with material with some control form; To guarantee for grinding efficiency; Milling train always holds the optimum inventory, and their responses are in the normal in nature variation that takes place of the abrasiveness of providing material and other, the material of being supplied with neither can overfill can emptying yet.For these known milling trains, to the control of material feeding routinely based on the for example pressure loss through nozzle ring or be used as the power consumption that rolls motor of the input signal of control circuit.Can use these control methods and no matter their inherent shortcoming; Because they are time lags; This has also caused the hysteresis of control, and they are indirect, and receives other the influence such as the operating parameter of the repetition factor of traversing separator, air consumption or other factors.

Summary of the invention

The purpose of this invention is to provide and a kind ofly be used for control and material is fed into such as roller like roller granule materials continued abrasive method, eliminate aforesaid shortcoming thus to let.

This can obtain through this method of in this introduction, mentioning, and is characterised in that: with the angle between at least one and the reference line in the roll shaft center line as the input signal of the control circuit that is used to control the material feeding being measured and being used.

Obtained the control rapid and suitable to the material feeding in view of the above, it has adopted the desired amount (due account) of replenishing direct control environment in the aspect roller about material, that is, and and the amount of the material that in preset time arbitrarily, exists in the roller.This is because the variation of roll shaft angle position will provide prompting or the significantly expression to any trend of milling train overfill or emptying.

In mentioned this roller with a plurality of hinged independently of one another rollers, these rollers will move up and down in response to the variation of lapping machine thickness in milling train operating period independently of one another, and the mutual angle position of roll shaft changes continually.But the mean value of roll shaft angle position will be positioned at very narrow scope usually, and therefore, it can be satisfied with the input signal that only position, angle of a roll shaft in the roll shaft is used as the Material control circuit.Yet; Under certain situation, it can use the mean value of the angle position of a plurality of or all roll shafts, and this is favourable; And in this case; The angle between many or all roll shaft center lines and one or more reference line can be measured, and the mean value of these angles can be calculated, and with the mean value of these angles input signal with the control circuit that acts on the feeding of control material.

In order only to have a reference line, advantageously can use the center line that runs through vertical central shaft.

In principle, the angle between roll shaft center line and the reference line can use the measurement mechanism that suffers to export any suitable of reliable measuring size under the mal-condition aspect temperature and the dust levels in milling train inside to measure.As the example of suitable device, can use displacement transducer (displacement transducer).

Realize will needing control module according to method of the present invention, a side of this control module is connected to measurement mechanism, and with receiving inputted signal, opposite side is connected to feed system simultaneously, is used for sending the output signal to this feed system.

In the milling train start-up course, this milling train is characterized in that desirable angle according to the operation operation based on specific setting point parameter, the method for the present invention of starting foundation then, and take over control to the milling train feeding.If measured angle reduces, control module will send to feed system has the signal that reduces material feeding instruction, so that avoid the milling train overfill, and vice versa.

The roller that is used to carry out the method for control material feeding comprises the grinding table of basic horizontal; Roller with a plurality of mutual operation with it; Said roller rotates to allow roller on the plane that comprises the roll shaft center line, to make freedom around the roll shaft separately that is connected to vertical central shaft via articulated elements and rotates up and down; Be used for material to be ground being continued to be fed into the device of roller, and be used for the device of grinding material from the lasting transfer of roller, and; It is characterized in that; The device that comprises the angle between at least one and the reference line that is used for the measuring roller shaft centre line, and, be used for the device of measured angle as the input signal of the control circuit of control material feeding.

Description of drawings

With reference now to accompanying drawing, the present invention will be described in more detail, and an only width of cloth accompanying drawing shows and is used to carry out the roller according to method of the present invention.

The specific embodiment

A kind of roller shown in the drawings; It comprises the grinding table 1 and a plurality of rollers 2 of level; Said a plurality of roller 2 is around roll shaft 3 rotations separately; Roll shaft 3 is connected to vertical central shaft 4 via articulated elements 5, to allow roller on the plane that comprises roll shaft center line 6, circumferentially freely to make progress and to move downward.Roller also comprises having material container 8, extract with 9 and the device 7 of the form of service pipe 10; And device with form of unshowned fan and nozzle ring 12; Wherein service pipe 10 has the feeding gate (feed sluice) 11 that is used for the material that need grind is continued to be fed into roller, and nozzle 12 is used for through using gases grinding material being continued to shift from roller.

Shown milling train also comprises drive system 13; This drive system 13 is used to make grinding table 1 and/or central shaft 4 to rotate; And roller 2 and separator 14 are rotated; So that the grinding material that is transferred to fine granular part and coarse component from milling zone is sorted, the fine granular part that in the gas a fluid stream, suspends is transferred via outlet 15, and coarse component is circulated again into grinding table 2 further to grind via funnel 16.

In order to obtain to material being fed into controlling with accurate fast of roller; The device that comprises form according to roller of the present invention with measurement mechanism 17; Measurement mechanism 17 is used for the angle [alpha] between measuring roller shaft centre line 6 and the reference line 18; This roller has desired amount, and this desired amount is taken from the direct control environment that replenishes the roller of aspect about material.Measurement mechanism 17 is connected with the device of the form with control module 19, and control module 19 can be with measured angle as the input signal that produces the output signal, and the output signal is released into feed system 7, is used for control material feeding on given time point.

When roller is in operation, control module 19 will send the signal with instruction to feed system 7 based on the signal that receives from measurement mechanism 17, to keep, to reduce or to increase the material feeding.If measured angle reduces, control module 19 will send signal guaranteeing the minimizing of material feeding 7 to feed system 7, and preventing the milling train overfill, and vice versa.

Claims

1. one kind is used to control material is fed to roller so that the granular material such as cement slurry, cement clinker and similar material is continued abrasive method; Said roller comprises the grinding table (1) of basic horizontal and the roller (2) of a plurality of and its interactive operation; Said roller rotates around the roll shaft separately (3) that is connected to via articulated elements (5) on the vertical central shaft (4); Rotate up and down to allow said roller on the plane that comprises the center line of said roll shaft (6), to make freedom; Material wherein to be ground is fed in the said roller constantly; And the material through grinding is transferred from said roller constantly, it is characterized in that, the angle (α) between at least one and the reference line (18) in the said roll shaft center line (6) is measured and be used as the input signal of the control circuit of controlling said material feeding.

2. the method for claim 1; It is characterized in that; Many or all said roll shaft center line (6) and the angle between one or more reference line (18) are measured comes out; Its characteristic is that also the mean value of said angle is calculated and be used as the input signal of the control circuit of controlling said material feeding.

3. according to claim 1 or claim 2 method is characterized in that, the center line that will pass said vertical central shaft (4) is as reference line (18).

4. the method for claim 1 is characterized in that, uses the angle between displacement sensor roll shaft center line (6) and the reference line (18).

5. roller that is used to carry out the method for the said material feeding of control; It comprises the grinding table (1) of basic horizontal and the roller of a plurality of mutual operation with it; Said roller rotates around the roll shaft separately (3) that is connected to via articulated elements (5) on the vertical central shaft (4); To allow said roller freedom on the plane that comprises the center line of said roll shaft (6) to rotate up and down, be used for constantly material to be ground being fed to the device (7) of said roller, and the device (12) that is used for grinding material is continued from said roller transfer; It is characterized in that; The device (17) that comprises the angle (α) between at least one and the reference line (18) that is used for measuring roller shaft centre line (6), and, be used for the device (19) of measured angle as the input signal of the control circuit of the said material feeding of control.