EP3313632A1 - A method for controlling the liquid level in the premixing unit of hatschekmachine - Google Patents
A method for controlling the liquid level in the premixing unit of hatschekmachineInfo
- Publication number
- EP3313632A1 EP3313632A1 EP16730394.0A EP16730394A EP3313632A1 EP 3313632 A1 EP3313632 A1 EP 3313632A1 EP 16730394 A EP16730394 A EP 16730394A EP 3313632 A1 EP3313632 A1 EP 3313632A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet manufacturing
- manufacturing machine
- selectifier
- cement slurry
- premixing unit
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/527—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a rotating drum, e.g. a sieve drum, from which the materials are picked up by a felt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/59—Mixing systems, i.e. flow charts or diagrams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
Definitions
- the present invention relates to Hatschek machines and methods for controlling such machines, in particular the liquid level in the premixing unit of a Hatschek machine.
- Hatschek machines are widely known and are operated for the manufacture of fibre cement sheets. In such machines, the flow of various liquids are numerous and the control thereof is complex. Controlling one flow often has a potentially strong influence on the operation of other parts of the machine or on the other liquid flows per se.
- a method for controlling the liquid level in the premixing unit of a Hatschek machine comprising a sheet manufacturing machine, a cement slurry preparation mixer, a settling tank, a selectifier and a premixing unit.
- the method comprises the step of supplying the selectifier with a first portion of the water-loaded cement slurry of the sheet manufacturing machine to the selectifier, wherein a level meter measures the liquid level in the premixing unit and generates a measurement signal, and wherein the measurement signal directly or indirectly controls a control valve, such that the amount of a second portion of the water-loaded cement slurry of the sheet manufacturing machine that is supplied to the selectifier, is controlled.
- the method may comprise the following steps: o A second portion of the water-loaded cement slurry of the sheet
- o Flocculant is supplied to the premixing unit in order to obtain a mixture which is supplied to the sheet manufacturing machine.
- the generated measurement signal may be processed by a processing unit, which generates a control signal that controls the control valve.
- the level meter may be a weighing cell.
- the amount of settled cement sludge from the settling tank which is supplied to the selectifier may be constant.
- a selectifier is a centrifugally operating cleaning device, used to remove solidified particles from a slurry.
- the generated measurement signal may be processed by a processing unit, which generates a control signal that controls the control valve.
- This processing unit may be a central processing unit, for example, the CPU of a control mechanism or of a computer.
- the level meter may be a weighing cell.
- a weighing cell is also known as a pressure box or load cell.
- the amount of settled cement sludge of the settling tank which is supplied to the selectifier may be constant.
- a Hatschek machine for the manufacture of fibre cement sheets which machine comprises
- a control valve is a valve whose opening is controllable by means of a control signal.
- the control valves can be any valves, but are, for example butterfly valves.
- a transport pipe is to be understood to mean any duct, tube or pipe, whether or not fixed or flexible, which is suitable for transporting a liquid from one location to another.
- the machine may further comprise at least a second control valve for controlling the amount of the mixture of the premixing unit, which is supplied to the sheet manufacturing machine via the sixth transport pipe.
- the sheet manufacturing machine may comprise at least a first container in which at least one cylindrical screen is ratably suspended for the manufacture of a fibre cement web, wherein the sixth transport pipe supplies the mixture of the premixing unit to said first container of the sheet manufacturing machine.
- the first container may comprise a second level meter for measuring the liquid level in said first container and for generating a second measurement signal, and wherein the processing unit converts the second measuring signal into a second control signal for controlling the second control valve.
- the sheet manufacturing machine may comprise at least a second container in which at least one cylindrical screen is ratably suspended for the manufacture of a fibre cement web, wherein a seventh transport pipe supplies the mixture of the premixing unit to said second container of the sheet manufacturing machine.
- the machine may further comprise at least a third control valve for controlling the amount of the mixture of the premixing unit, which is supplied to the sheet manufacturing machine via the seventh transport pipe.
- the second container may comprise a third level meter for measuring the liquid level in said second container and for generating a third measuring signal, and wherein the processing unit converts the third measurement signal into a third control signal for controlling the third control valve.
- Figure 1 is a schematic representation of a Hatschek machine according to the invention.
- a Hatschek machine 1000 for the manufacture of fibre cement sheets is shown in Figure 1 .
- the machine 1000 comprises
- a first transport pipe 601 is provided for supplying a first portion of the water- loaded cement slurry of the sheet manufacturing machine 100 to the settling tank 300.
- a second transporting pipe 602 is provided for supplying settled cement sludge of the settling tank 300 to the selectifier 400.
- a third transport pipe 603 is provided for supplying a second portion of the wa- ter-loaded cement slurry of the sheet manufacturing machine 100 to the selectifier 400.
- first and third transport pipes 601 and 603 can partially proceed via mutual pipelines 604, which spit, in turn, into the first and third transport pipe 601 and 603.
- a fourth transport pipe 605 is provided for supplying cement slurry of the fibre cement slurry preparation mixer 200 to the selectifier 400.
- the flow rate of fibre cement slurry between the mixer 200 and the selectifier 400 is determined by means of a valve (not shown on Figure 1 ). Said opening of said valve is determined by the thickness of the formed fibre cement sheet, and, if necessary, can be adjusted.
- a fifth transport pipe 606 is provided for supplying the cement mixture, from which the hard particles have been removed, of the selectifier 400 to the premixing unit 500.
- a means is provided, being an inlet 607, for adding flocculant to the premixing unit 500.
- a sixth transport pipe 608 is provided for supplying a mixture of the premixing unit 500 to the first container 101 of the sheet manufacturing machine 100.
- the sheet manufacturing machine 100 also comprises a second container 102 and a seventh transport pipe 609 which supplies a mixture of the premixing unit 500 to said second container 102 of the sheet manufacturing machine 100.
- Each of the containers 101 and 102 has at least one, and as can be seen in this embodiment, in each case two rotary screens 103, which provide in a known way a fine fibre cement web to a conveyor belt 104, which conveys these webs to a forming drum 105.
- the Hatschek machine 1000 further comprises some level meters. It comprises a first level meter 501 , being a weighing cell, for measuring the liquid level in the premixing unit 500 and for generating a first measurement signal 701 .
- the machine 1000 further comprises a second level meter 106 and a third level meter 107 for measuring the liquid level in the first container 101 and the second container 102, respectively. Each of these level meters generates a measurement signal 702 and 703.
- a first control valve 801 is provided for controlling the second portion of the wa- ter-loaded cement slurry of the sheet manufacturing machine 100 to the selecti- fier 400.
- a second (802) and third (803) control valve is provided for controlling the supply of the quantity of the mixture of the premixing unit 500 to the sheet manufacturing machine 100 via the sixth and seventh transport pipe.
- a processing unit 900 is provided for converting the first, second and third measurement signal (701 , 702 and 703) to a first, second and third control signal (704, 705 and 706) for controlling the three control valves.
- the first control signal 704, which controls the control valve 801 will, of course, predominantly, or even only be generated on the basis of the measurement signal 701 of the weighing unit 501 .
- the second control signal 705, which controls the control valve 802, will, of course, predominantly, or even only be generated on the basis of the measurement signal 702 of the level meter 106 in the first container 101 .
- the third control signal 706, which controls the control valve 803, will, of course, predominantly, or even only be generated on the basis of the measurement signal 703 of the level meter 107 in the second container 102.
- the level meters 106 and 107 are preferably bubble tubes (also called bubble pipes).
- the machine 1000 further comprises a pilot valve 804 which controls the permanent supply of a quantity of sludge of the settling tank 300, also called decanter unit or cone, to the selectifier.
- a pilot valve is a valve the opening of which can be controlled, but the opening of which is normally not changed in function of a control signal.
- the level in the premixing will unit 500 will fluctuate depending on the requested amount of fibre cement slurry via the valves 802 and 803 by the sheet manufacturing machine 100. These fluctua- tions are absorbed by supplying more or less water-loaded cement slurry via control valve 801 to the selectifier 400, which in turn flows into the premixing unit 500. This control of the amount takes place via control signal 704.
- the amount of water-loaded cement slurry which is supplied via transport pipe 601 to the settling tank 300 will vary in time, during which a same amount of sludge from said container 300 is constantly supplied via valve 804 to the selectifier.
- the fluctuations in the supply of the water, loaded with cement slurry are hardly going to disturb nor impede the stable operation of the settling tank 300.
- the level of the premixing unit 500 was controlled by the optional supply of sludge (and, consequently, placing the valve 804 either in an open position or a closed position), at a constant supply of water-loaded cement slurry via the transport pipe 603, the operation of the settling tank will be disturbed.
- Such on/off control has a disturbing effect on the currents in the container 300.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Control Of Non-Electrical Variables (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2015/5401A BE1022912B1 (en) | 2015-06-29 | 2015-06-29 | A method for controlling the liquid level in the premixing unit of a hatschekmachine |
PCT/EP2016/064204 WO2017001231A1 (en) | 2015-06-29 | 2016-06-20 | A method for controlling the liquid level in the premixing unit of hatschekmachine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3313632A1 true EP3313632A1 (en) | 2018-05-02 |
Family
ID=54251891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16730394.0A Withdrawn EP3313632A1 (en) | 2015-06-29 | 2016-06-20 | A method for controlling the liquid level in the premixing unit of hatschekmachine |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP3313632A1 (en) |
AR (1) | AR105164A1 (en) |
BE (1) | BE1022912B1 (en) |
CL (1) | CL2017003266A1 (en) |
CO (1) | CO2017011588A2 (en) |
PE (1) | PE20180737A1 (en) |
WO (1) | WO2017001231A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1872480A (en) * | 1931-07-17 | 1932-08-16 | Dorr Co Inc | Making cement-asbestos products |
JPS5181820A (en) * | 1975-01-13 | 1976-07-17 | Nihon Cement | Setsukobanno seizohoho |
DE102012212529A1 (en) * | 2012-07-18 | 2014-01-23 | Voith Patent Gmbh | Security paper-flow system |
-
2015
- 2015-06-29 BE BE2015/5401A patent/BE1022912B1/en active IP Right Grant
-
2016
- 2016-06-20 PE PE2017002854A patent/PE20180737A1/en unknown
- 2016-06-20 WO PCT/EP2016/064204 patent/WO2017001231A1/en active Application Filing
- 2016-06-20 EP EP16730394.0A patent/EP3313632A1/en not_active Withdrawn
- 2016-06-28 AR ARP160101941A patent/AR105164A1/en unknown
-
2017
- 2017-11-14 CO CONC2017/0011588A patent/CO2017011588A2/en unknown
- 2017-12-19 CL CL2017003266A patent/CL2017003266A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2017001231A1 (en) | 2017-01-05 |
AR105164A1 (en) | 2017-09-13 |
PE20180737A1 (en) | 2018-04-27 |
BE1022912B1 (en) | 2016-10-13 |
CL2017003266A1 (en) | 2018-06-22 |
CO2017011588A2 (en) | 2018-01-31 |
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Legal Events
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