• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    At least one channel in a multi-channel paper machine distributor is maintained in flow velocity slave relation to another of the channels by monitoring the velocity with a pressure transducer of stock flow through the latter channel and by such monitoring controlling the stock velocity in the slave channel.
    公开号:SU1093256A3
    申请号:SU772502195
    申请日:1977-07-15
    公开日:1984-05-15
    发明作者:Дж.Джастас Эдгар
    申请人:Белойт Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to control devices for the pressure machine of a paper machine and can be used in the manufacture of paper. A known system for controlling the pressure machine of a paper machine contains controllers for the feed rate of the mass for each channel 1. A disadvantage of the known control system is the low control accuracy. The purpose of the invention is to improve the accuracy of control. This goal is achieved by the fact that the control system of the paper machine's pressure box, which contains the mass feed rate controllers for each channel, has pressure sensors installed in each channel of the pressure box, and total pressure and speed sensors installed at the output of the pressure box, matching units, indicators Comparison units, functional transducers, run-in speed sensor, computing unit, pressure regulator, ratio determination units for external pressure head channels a and a flow meter, wherein the outputs of the pressure sensors are associated with the corresponding inputs of matching units, the outputs of which are connected to the corresponding indicators and additionally with corresponding first inputs of the comparison units, the second inputs of which are connected with the total pressure sensor through the corresponding matching unit, the first outputs. Comparison units are connected to the corresponding inputs.
    functional converters, the output outputs of the comparison units are connected by means of matching correlation units with the inputs of the corresponding D and mass regulators of the feed mass, the output of the comparator corresponding to the middle channel of the pressure tank is connected to the input of the flow meter, and
    The second input of the computing unit, the output of which is connected to the input of the corresponding speed controller, the second input of the computing unit is connected to the output of the pressure regulator, and its third input is connected to the speed sensor installed at the outlet of the pressure box. one
    the main channel 11, and essentially have the same length with the central channel. Paper mass of the corresponding composition is fed to the inlet ends of the distribution device channels by means of appropriate piping. The piping consists of pipe 1.3, which communicates with channel 11, and corresponding to channels 12. At the exit of channels 11 and 12, the paper pulp passes through a perforated partition 15, beyond which the channels converge 55 to the mass application hole with thin
    . layer 7.
    The control system also includes an orifice 16 of the neck 8. on a 6, f. In FIG. 1 is a block diagram of a pressure box control system; in fig. 2 - the same. The control system of the press box of the papermaking machine contains inlet lines 1, 2 and 3, information management and processing device 4, switchgear 5 which contains paper stock channels 6 converging to the application hole with a thin layer 7, the width of which corresponds to the width of the desired web. The flow of paper pulp flowing out of the application hole with a thin layer 7 in such a way as to begin the process of making a sheet of paper enters the neck 8 at the entrance of the dewatering process of the forming device of a paper-making machine consisting of fabric or wire strips 9 moving over the forming or supporting rollers 10. Inside the dispenser 5, the paper pulp for a series of layers intended to create a multi-layered paper web enters a corresponding row of individual channels. s, converging to the mass deposition hole with a thin layer 7, and flowing through them. In the illustrated example, to create a three-ply paper product (the term paper used includes paper with a backing sheet, laminated paper and the like), the switchgear device includes a central channel 11 and two external channels 12, one of which is shown above the central channel 11 and another bottom centering pipes 14, total 17 impellers / type, strainer 18, pipes 19, 20 and 21 impeller pumps 22, strainer 23 connected to the pumps 22 with pipe wires 24, flow transfer devices 25 and 26, y device 27, valves 28, pressure sensors 29 and 30, pressure transfer devices 31, pressure indicators 32, differential pressure transfer devices 33, pressure transfer device 34, pressure sensor 35, functional converters 36 and 37, flow meter 38, control devices 39. The control system contains parity determination units 40 for external channels of the pressure box, communication lines 41, speed controllers 42, paper pulp motors 43, control switches 44, wiring speed sensor 45 connected by wire 46 computational unit 47, pneumatic pressure sensor 48, differential pressure transmission device 49, regulator 50, pressure gauge 51 connected to differential pressure transmission device 49 and regulator 50 by pipeline 52, comparator blocks 53, engine 55 regulator 54. line 56, connecting the block 53 with the switch 57. After turning on the control system operates as follows. Means are included for the autonomous supply of paper paper with the required concentration through the supply line 13 to the channel 11 and the paper mass with the corresponding concentration to the external, channels 12 through and the supply lines 14. Although the concentration of paper pulp fed through conduit 13 of the central channel will differ from the concentration of paper pulp supplied through pipelines 14 to external cannels 12, the paper weight of the external channels may be either the same or different, depending on the type of multi-layer paper web being created. Therefore, although the supply conduit 13 is supplied from a suitable crate (not locally) heavy paper pulp (paper pulp which is in a more initial concentration than the actual one required for a thin layer pulp opening) which is not connected to the source of the supply pipelines 14, depending on the requirements of heavy paper pulp in pipelines i 4. mo: "; can be supplied either from independent paper pulp chambers (not shown). either from a shared camera. Heavy paper pulp for pipeline 13 passes through the pipeline to the inlet of a pump 17 of a vane pump type, and then from the pump through screen filters 18 enters the pipe 13 for feeding under the pressure created by the pump into channel 11. To liquefy heavy paper pulp to the desired consistency or concentration, water is supplied to the inlet side of the pump 17 along with heavy paper pulp, for example, through conduit 19. In a similar manner, the paper pulp is supplied to each of the pipelines 14 through a respective pipe lines 20 and, connected to the corresponding water supplied by means of pipelines 21, goes to the inlet sides of the peak pumps 22, and then from the discharge sides of the pumps through strainers 23 to the corresponding pipe 14. Dilution of heavy paper pulp can from about 1.0-10% of fibers, from 0.1-1.07% of fibers in a suspension of paper pulp discharged from a spreading hole with a thin layer 7 of a distributor. Water can be supplied through pipelines 19. and 21 from individual sources or from a single common bunker intended to supply white water to the system. Each pipe line or each pipe: a wire of 19 and 20 heavy paper pulp is independently controlled and controlled depending on the needs of the pumps with the help of appropriate flow transfer devices 25, signals from which flow control devices 27 show the flow rates upstream of the Valve 28 Transmission devices in accordance with the signals from the flow rate of the control devices. In order to automatically maintain the required ratio of pulp flows in the channels of the switchgear 5, means are provided for maintaining the outer channels 12 in a controlled manner depending on the inner
    s
    channel 11, since the internal channel is usually installed in such a way that it creates a thicker layer in the composite paper web. For this purpose, a BiTouuw pressure sensor 29 is installed, for which a pneumatic type sensor can be used. It is installed in such a way that it reacts to pressure in the central channel 11 upstream from the plate by a perforated partition in each of the external channels 12. From each of the sensors 29 and 30, signals are sent to separate pressure transmitters 31 connected to separate pressure indicators 32, which may be displayed on a corresponding instrument panel (not shown) associated with the paper machine. Each of the pressure transmitting devices 31 transmits a signal to a separate differential pressure transmitting device 33. In the differential pressure transmission device 33, the signal from the transmission device 34 of the event associated with the pneumatic sensor installed at the end of the central channel 11 at the outlet is compared; thin-layer coatings. The resulting differential signals from each differential pressure transmission device 33 are sent to individual square root extraction devices 37, in which square roots are extracted from various differential pressures. This makes it possible to compare the rates of passing of the paper pulp in the three channels of the distribution device 5, since the hydraulic head and the velocity of the fluid moving in the pipe or in the closed channel are interdependent according to the following formula: tlf-ff where h is the hydraulic head; G is a constant; f - pipe friction coefficient; L is the length of the pipe or channel; m is the hydraulic radius; § - acceleration of the force of body; V is the speed. The signal from the transducer (square root extractor) 3 for the center channel goes to the flow meter 38, which can be
    1093256
    installed on the dashboard. The signals from the square-root extraction devices 36 and 37 of the two external channels are supplied to the respective flow indicating control devices 39 for each of the two external channels 12.
    The signal from the square-root transmission device 37 of the differential pressure for the center channel 11 is also supplied to the ratio determination units 40 for each of the two external channels 12. Due to their interconnection, the ratio determination units 40 produce identical set points for the flow rate controllers 39 based on the flow in the center channel 11. These setpoints are then compared in the flow rate control devices 39 for the two external channels 12 with the signals from the devices transmitting the square root value from the pressure drop of the external channels. The signals from the flow rates of the control devices 39 are fed to separate respective speed controllers 42 for controlling the respective drives of the motors 43 of the pulp pump. Thus, the rate of operation of the pumps 22 regulating the supply of paper pulp for the two external channels 12 is controlled depending on the speed of the pump feeding the central channel 11. If in either one or both channels 12 it is necessary to apply py4Hoie control of the pulp feed rate , the set values for these channels can be set manually by means of the automatic hand control switches 44, which can be placed between the flow-indicating control devices 39 and the rest 42 speed thrusters. In this way, the feed rates of the pulp in each of the outer channels 12 are fully controlled. Blabdar controls the dependence of the outer channels 12 on the central channel 11 simply by controlling the speed of the pulp in the central channel 11 relative to the speed of the forming tape in the forming unit of the machine. full maintenance of the required ratio of motion to wiring (the ratio of the speed of the wire to the velocity of the composite flux coming out of the distribution of the device 5). This ratio is usually taken to be about 1.0, but it can vary from about 1.1 to 0.9, depending on factors such as the speed of the machine, the consistency of the paper pulp and the type of paper produced. The speed of movement of the wire or tape is determined based on the speed of rotation of the joint primer roller (not shown) and is transmitted as a technical speed through the turn-in speed sensor 45 to the computation unit 47 of the motion-to-drag ratio. During operation, the pneumatic pressure sensor 48 installed at the outlet end near the application hole with a thin layer of the central channel 11 in the switchgear 5, monitors. the flow rate and signals the differential pressure transmission device 49, the signal from which is fed to the computing unit 47 of the motion-to-drag ratio. The signal from the pressure sensor 48 actually informs the differential pressure transmission device of the zone of the compound pulp flow measured by the pressure sensor around the pulping hole in a thin layer. Although the differential pressure transmission device 49 can operate autonomously, it is preferably connected to a pressure regulator 50 providing an offset to the differential pressure transmission device 49 by air pressure, which enables the transmission device 49 to output signals to the computing unit 47 higher resolution. This is desirable because the pressure range inside the switchgear 5 during operation near the design speed of the machine with the required consistency of paper pulp does not change much and does not exceed the full range of the transmission device 49. Therefore, the higher resolution of the ability shown by the transmission device 49 is performed if it is controlled in such a way that the pressure is read in a narrower range, overlapping the actual pressures expected to meet
    during work. To achieve this, the regulator 50 to one arm of the transmission device 49 is shifted by air pressure, which is monitored by a pressure gauge 51. This causes the operation of the transmission device 49 in a lower range, for example in the 5080 mm water range. Art., and thus increases its accuracy, for example, to 0.25% compared to, for example, from 0.5-1.0%, which could be expected in the pressure range of 10160 mm of water. Art. By varying the bias air pressure, the working range and accuracy of the differential pressure transmission device 49 can be changed as desired.
    During operation, the computation unit 47 of the movement-to-drag ratio produces a predetermined value that is used by the indicating pressure controller C1-1m device 53 for comparison with the signal from the differential pressure transmission device 49, in order to supply the corresponding signal to the engine speed regulator 54 55 , a central channel pump 17 is activated. Alternatively, the preset value can be set manually by the automatic-manual control switch 57. In accordance with the invention, not only the regulating control of one of the channels of the pulp mass by any other channel in the switchgear 5 is provided, but also the sensitivity of the switchgear 5 to the speed of operation of the co-operating unit of the paper machine is high. Due to the fact that in the switchgear 5, the controllability of the channels of the paper pulp of the outer layers from the central channel 11 is automatically controlled, after making the required individual adjustments for each of the channels and a thin layer 7 in the pulping opening 7, the ratio between the accuracy of the paper pulp direction and speed operation of the forming device during the operation of the machine is supported automatically. The use of the invention will improve the accuracy of control.
    fie. {
    权利要求:
    Claims (1)
    [1]
    PAPER MACHINE HEADER BOX CONTROL SYSTEM, containing mass feed rate regulators for each channel, characterized in that, in order to improve control accuracy, it has pressure sensors installed in each channel of the headbox and total pressure and speed sensors installed at the output headbox, matching blocks, indicators, comparison blocks, functional converters, wire speed sensor, computing unit, pressure regulator, ratio determination units for external x channels of the pressure box and a flow meter, while the outputs of the pressure sensors are connected to the corresponding inputs of the matching blocks, the outputs of which are connected to the corresponding indicators and additionally to the corresponding first inputs of the comparison blocks, the second inputs of which are connected to the sensor of the total pressure through the corresponding matching block, the first outputs comparison blocks are connected to the corresponding inputs of the functional converters, the second outputs of the comparison blocks are connected by means of locks to determine the relationship with the inputs of the respective mass flow rate controllers, the output of the comparison unit corresponding to the middle channel of the pressure tank is connected to the input of the flowmeter, and the wire speed sensor is connected to the first input of the computing unit, the output of which is connected to the input of the corresponding speed controller, the second input of the computing unit It is connected to the output of the pressure regulator, and its third input is connected to a speed sensor installed at the outlet of the headbox.
    SU w> 1093256>
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1093256A3|1984-05-15|Control system of head box of papermaking machine
    US4374703A|1983-02-22|Control system for papermaking machine headbox
    US2517051A|1950-08-01|Apparatus for conducting ion exchange operations
    US4384922A|1983-05-24|Installation for charging a multi-ply headbox for papermaking machines
    US4526653A|1985-07-02|Control system for a multilayer headbox using an ultrasonic transducer
    KR20000057352A|2000-09-15|Flow splitting device for web profile control stock dilution system
    US4075739A|1978-02-28|Method and apparatus for controlling a card
    GB892389A|1962-03-28|Improvements in or relating to solids concentration measuring and regulating devices
    EP0335343A2|1989-10-04|Active attenuator for attenuation of the pressure pulsation in the headbox in paper and board machines
    US2302327A|1942-11-17|Automatic consistency control means
    US6200421B1|2001-03-13|Apparatus and process for feeding stock to a papermachine
    US2901040A|1959-08-25|Apparatus for controlling stock level in a pressurized headbox
    US2847913A|1958-08-19|Stock inlet system for a paper making machine
    JP2879470B2|1999-04-05|Control valve with flow meter function
    US2302326A|1942-11-17|Automatic consistency control
    US4574033A|1986-03-04|Method and apparatus for delivering a multilayer jet of stock to a forming surface in a papermaking machine
    US4519247A|1985-05-28|Procedure for lubricating the bearings in equipment comprising a plurality of oil-lubricated bearings
    US2382853A|1945-08-14|Pneumatic control
    US1924468A|1933-08-29|Method of and apparatus for measuring gases
    JPS60113081A|1985-06-19|Control device for oil-hydraulic pump
    US2680997A|1954-06-15|Apparatus for continuous chemical cleaning and conditioning of paper mill wet felts
    US1311861A|1919-07-29|And one-third to albert bald
    US3337393A|1967-08-22|Papermachine headbox discharge velocity indicator
    US2976689A|1961-03-28|Remote control means for controlling operation of prime movers in a continuous process
    SE521176C2|2003-10-07|Distribution device for even distribution and cross-distribution of a streaming medium
    同族专利:
    公开号 | 公开日
    US4086130A|1978-04-25|
    DE2732361A1|1978-01-26|
    AR223637A1|1981-09-15|
    DE2732361C2|1983-01-05|
    IT1080675B|1985-05-16|
    JPS5622996B2|1981-05-28|
    FR2358503B1|1982-04-30|
    BR7704389A|1978-04-04|
    JPS5310705A|1978-01-31|
    PL110717B1|1980-07-31|
    CA1092681A|1980-12-30|
    FI771999A|1978-01-17|
    GB1537600A|1979-01-04|
    FI62875B|1982-11-30|
    SE411922B|1980-02-11|
    SE7707789L|1978-01-17|
    FR2358503A1|1978-02-10|
    FI62875C|1983-03-10|
    ES460375A1|1978-04-01|
    PL199565A1|1978-03-13|
    MX144790A|1981-11-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2677991A|1948-02-02|1954-05-11|Powell River Company Ltd|Stock inlet for papermaking machines|
    US3293120A|1964-07-29|1966-12-20|Bailey Meter Co|Paper machine pressurized headbox control of stock flow|
    US3337393A|1964-12-16|1967-08-22|Beloit Corp|Papermachine headbox discharge velocity indicator|
    US3598696A|1968-02-14|1971-08-10|Beloit Corp|Multiple stage hydraulic headbox|
    US3711688A|1968-06-27|1973-01-16|Bunker Ramo|Computer control of paper machine in which basis weight is controlled through control of stock flow|
    SE345295B|1969-02-18|1972-05-23|Asea Ab|
    US3703436A|1970-02-03|1972-11-21|Industrial Nucleonics Corp|Anticipatory control of headbox slice opening in a paper machine|
    FI379674A|1974-01-17|1975-07-18|Beloit Corp|
    US3923593A|1971-12-03|1975-12-02|Beloit Corp|Multiple ply web former with divided slice chamber|
    US3886036A|1972-03-13|1975-05-27|Measurex Corp|Method of controlling a drier limited paper machine|
    US3839143A|1972-06-08|1974-10-01|Beloit Corp|Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween|
    CH559283A5|1972-12-11|1975-02-28|Escher Wyss Gmbh|
    US4021295A|1975-05-05|1977-05-03|Beloit Corporation|Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web|CH619777A5|1977-10-20|1980-10-15|Escher Wyss Gmbh|
    SE421328B|1978-04-25|1981-12-14|Karlstad Mekaniska Ab|PROCEDURE AND DEVICE FOR IMAGE OF A MULTILAYER MELT Beam|
    US4376014A|1979-04-12|1983-03-08|Beloit Corporation|Headbox for forming multi-ply sheets|
    US4376012A|1979-04-12|1983-03-08|Beloit Corporation|Method of forming a multi-ply web from paper stock|
    AT376251B|1980-12-19|1984-10-25|Escher Wyss Gmbh|DEVICE FOR LOADING A MULTI-LAYER MATERIAL FEEDER FOR PAPER MACHINES|
    SE428809B|1981-12-01|1983-07-25|Karlstad Mekaniska Ab|SET AND DEVICE WHEN OPERATING A INPUT CHARGING OR SIMILAR MESSAGE DEVICE FOR A PAPER MACHINE GET INFORMATION ON THE SIZE OF A MELT OUTLET|
    SE428810B|1981-12-01|1983-07-25|Karlstad Mekaniska Ab|CONTROL SYSTEM FOR REGULATING A MULTIPLE INPUT CHARGE FOR A PAPER MACHINE|
    JPS63213B2|1982-03-24|1988-01-06|Fukui Kikai Kk|
    SE431663B|1982-07-06|1984-02-20|Karlstad Mekaniska Ab|PROCEDURE AND DEVICE FOR DELIVERING A MULTI-LAYER MELTER TO A FORMAT SURFACE IN A PAPER MACHINE|
    FI83549C|1986-09-19|1991-07-25|Valmet Oy|FOERFARANDE OCH ANORDNING VID INLOPPSLAODAN OCH DESS TILLSTROEMNINGSSYSTEM I EN PAPPERSMASKIN.|
    JPH0438972Y2|1987-07-13|1992-09-11|
    DE3835903C2|1988-10-21|1995-08-03|Escher Wyss Gmbh|Method for controlling a multi-layer headbox of a paper machine|
    US5145560A|1989-12-29|1992-09-08|Weyerhaeuser Company|Method and apparatus for monitoring and controlling the velocity of a jet along the slice opening of a papermaking machine|
    US5707495A|1990-06-20|1998-01-13|J.M. Voith Gmbh|Headbox for papermaking machine with more uniform flow|
    US6355142B1|1990-11-01|2002-03-12|Fort James Corporation Of Virginia|Method of controlling headbox jet velocity for foamed furnishes|
    FI92729C|1993-10-29|1994-12-27|Valmet Paper Machinery Inc|System for feeding a pulp to a multilayer inlet box and method of operating a multilayer inlet box|
    DE4423695C2|1994-07-06|1996-10-31|Voith Sulzer Papiermasch Gmbh|Process for the production of a paper or cardboard web|
    US6210535B1|1995-06-01|2001-04-03|Valmet Corporation|Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox|
    FI110704B|1996-10-18|2003-03-14|Metso Paper Inc|Multilayer Headbox Mass Feeding System and Method for Multilayer Headboard Operation|
    DE29701032U1|1997-01-22|1997-03-13|Voith Sulzer Papiermasch Gmbh|3-layer headbox|
    US6274002B1|1998-06-23|2001-08-14|Wilbanks International, Inc.|Papermaking machine with variable dewatering elements including variable pulse turbulation blades adjusted by computer control system in response to sensors of paper sheet characteristics|
    US6136153A|1999-02-23|2000-10-24|Ahlstrom Glassfibre Oy|Foam process web formation using pressure removal of fluid|
    DE19932745A1|1999-07-14|2001-03-22|Voith Paper Patent Gmbh|Regulation of the pressure in a headbox nozzle|
    FI19991793A|1999-08-23|2001-02-24|Andritz Ahlstrom Oy|Method for controlling the operation of an inflow system of a paper machine or the like|
    WO2021207626A1|2020-04-09|2021-10-14|Andritz Inc.|Controlling the slice flow of a slurry through a headbox|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/705,828|US4086130A|1976-07-16|1976-07-16|Control system and method for a multi-channel paper machine distributor|
    [返回顶部]