CN102421527B

CN102421527B - Method for controlling the material feed to a roller mill and such similar mills

Info

Publication number: CN102421527B
Application number: CN201080020302.5A
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: 2014-01-08
Anticipated expiration: 2030-03-30
Also published as: WO2010113119A1; BRPI1014057A2; CN102421527A; 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

For controlling method and the roller that material is fed into to roller

Technical field

The present invention relates to for material being fed into to roller (roller mill) with to such as cement slurry, the granular material of cement clinker and similar materials continues the method for grinding, this roller comprises the grinding table of basic horizontal and the roller (roller) of a plurality of and its interactive operation, described roller rotates around the roll shaft separately be connected to via articulated elements on vertical central shaft, to allow roller, on the plane that comprises this roll shaft center line, do freely to rotate up and down, material to be ground is fed in roller constantly herein, and the material through grinding is transferred from roller constantly.The invention still further relates to for carrying out the roller of the method.

background technology

Can recognize aforementioned this roller type by for example No. 2.061.422 German publication application.This known milling train (mill) is configured to rotate in grinding table halted state lower roll subgroup, and in addition, it also has batch type (portion type), this means that it can't operate continuously, but in mode in batches, operated, it comprise each supplement, processing and emptying a material.In addition, can learn the lasting grinding to granule materials by other roller, these rollers comprise, for material being continued to be fed into the device of roller, with the device for grinding material being continued from roller shift, for example, by introduce the method for air stream via nozzle ring.These take the common trait of the lasting roller ground to be, they need to be fed into milling train by material with some control form, to guarantee for grinding efficiency, milling train always holds the optimum inventory, and their responses are in the abrasiveness of provided material and other normal variation occurred in nature, the material of supplying with neither can overfill can be not emptying yet.The known milling train for these, to the control of material feeding routinely based on for example pressure loss by 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 controlling, and they are indirectly, and is subject to the impact of other the operating parameter such as 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 for controlling, material is fed into such as roller and as roller, granule materials is continued the method for grinding to allow, eliminate thus aforesaid shortcoming.

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

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

In the mentioned this roller with a plurality of hinged rollers independently of one another, these rollers will move up and down in response to the variation of lapping machine thickness independently of one another in milling train operating period, 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 only input signal as the Material control circuit by the position, angle of a roll shaft in roll shaft.Yet, in the situation that certain, it can use the mean value of the angle position of a plurality of or all roll shafts, 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 by the input signal that acts on the control circuit of controlling the material feeding for the mean value of these angles.

In order only to there is 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 reference line can be measured with the measurement mechanism that can export any suitable of reliable measurements size under the mal-condition suffered in milling train inside aspect temperature and dust levels.As the example of suitable device, can use displacement transducer (displacement transducer).

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

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

The grinding table that comprises basic horizontal for the roller of carrying out the method for controlling the material feeding, roller with a plurality of mutual operation with it, described roller rotates to allow roller to do freely to rotate up and down on the plane that comprises the roll shaft center line around the roll shaft separately that is connected to vertical central shaft via articulated elements, for material to be ground being continued to be fed into the device of roller, and the device for grinding material being continued from roller shift, and, it is characterized in that, comprise the device for the angle between at least one and reference line of measuring roller shaft centre line, and, for the device as the input signal of the control circuit of controlling the material feeding by measured angle.

The accompanying drawing explanation

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

The specific embodiment

A kind of roller shown in the drawings, it comprises grinding table 1 and a plurality of roller 2 of level, described 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 circumferentially freely motion up and down on the plane that comprises roll shaft center line 6.Roller also comprises having material container 8, extract with 9 and the device 7 of the form of service pipe 10, and the device with form of unshowned fan and nozzle ring 12, wherein service pipe 10 has the feeding gate (feed sluice) 11 that material for needing to grind continues to be fed into roller, and nozzle 12 is for by being used gas that grinding material is continued to shift from roller.

Shown milling train also comprises drive system 13, this drive system 13 is for rotating grinding table 1 and/or central shaft 4, and make thus roller 2 and separator 14 rotate, with the grinding material to be transferred to fine granular part and coarse component from milling zone, sorted, fine granular part in the intrafascicular suspension of gas flow 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 material being fed into to controlling fast and accurately of roller, the device that comprises the form with measurement mechanism 17 according to roller of the present invention, measurement mechanism 17 is for the angle [alpha] between measuring roller shaft centre line 6 and reference line 18, this roller has desired amount, and this desired amount is taken from the direct control environment that supplements 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 by measured angle as the input signal that produces output signal, and output signal is released into feed system 7, for control the material feeding on given time point.

When roller is in operation, control module 19, by the signal based on receiving from measurement mechanism 17, sends the signal with instruction to feed system 7, to maintain, to reduce or to increase the material feeding.If measured angle reduces, control module 19 will send signal to guarantee the minimizing of material feeding 7 to feed system 7, and to prevent the milling train overfill, and vice versa.

Claims

1. one kind is fed to roller granular material is continued to the method for grinding for controlling by material, described roller comprises the grinding table (1) of basic horizontal and the roller (2) of a plurality of and its interactive operation, described roller rotates around the roll shaft separately (3) be connected to via articulated elements (5) on vertical central shaft (4), to allow described roller, on the plane that comprises the center line of described roll shaft (6), do freely to rotate up and down, wherein material to be ground is fed in described roller constantly, and the material through grinding is transferred from described roller constantly, it is characterized in that, angle (α) between at least one and reference line (18) in described roll shaft center line (6) is measured and be used as controlling the input signal of the control circuit of described material feeding.

2. the method for claim 1, is characterized in that, described granular material is cement slurry or cement clinker.

3. the method for claim 1, it is characterized in that, many or all described roll shaft center line (6) and angle between one or more reference line (18) out measured, the mean value of described angle is calculated and is used as controlling the input signal of the control circuit of described material feeding.

4. method as claimed any one in claims 1 to 3, is characterized in that, will be through the center line of described vertical central shaft (4) as reference line (18).

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

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