GB2259262A - Blade control system - Google Patents

Blade control system Download PDF

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Publication number
GB2259262A
GB2259262A GB9118801A GB9118801A GB2259262A GB 2259262 A GB2259262 A GB 2259262A GB 9118801 A GB9118801 A GB 9118801A GB 9118801 A GB9118801 A GB 9118801A GB 2259262 A GB2259262 A GB 2259262A
Authority
GB
United Kingdom
Prior art keywords
blade
control system
blade control
magnetostrictive
profile
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.)
Granted
Application number
GB9118801A
Other versions
GB2259262B (en
GB9118801D0 (en
Inventor
Rodney David Greenough
Alan G I Jenner
Anthony James Wilkinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Hull
Original Assignee
University of Hull
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by University of Hull filed Critical University of Hull
Priority to GB9118801A priority Critical patent/GB2259262B/en
Publication of GB9118801D0 publication Critical patent/GB9118801D0/en
Publication of GB2259262A publication Critical patent/GB2259262A/en
Application granted granted Critical
Publication of GB2259262B publication Critical patent/GB2259262B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/041Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
    • B05C11/042Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades allowing local positioning, loading or deforming along the blades

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  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A blade control system includes a number of magnetostrictive rods (9) arranged so as to change the profile of a blade (5). Preferably, each rod is held under a compressive force by a spring (11). Application of a magnetic field on the rods causes their expansion or contraction thus changing the blade profile. <IMAGE>

Description

BLADE CONTROL SYSTEM This invention relates to blade control systems. The invention has particular, although not exclusive relevance, to blade control systems for controlling the profile of coating blades. Such coating blades are used, for example, in the floor coverings industry to produce layers of, for example, linoleum. As it is very important to be able to control the thickness of the liquid linoleum while it is being spread, it is necessary to use a blade control system to adjust the profile of the coating blade.
In known blade control systems the necessary blade control is achieved by connecting thermal bolts between a fixed yoke and various points along the blade. The thermal bolts are heated, or cooled, to produce expansion or contraction of the bolts, thereby altering the transverse forces acting on the blade and thus changing the profile of the blade. This will be necessary, for example to correct a blade having a naturally corrugated form.
It is an object of the present invention to provide an alternative form of blade control system, which does not require the use of heat.
According to the present invention there is provided a blade control system including at least one body of magnetostrictive material effective to change the profile of a blade when a magnetic field is applied to the magnetostrictive body.
Preferably, the blade control system includes means effective to keep the magnetostrictive body under a compressive force. The compressive force means is suitably a spring means.
Preferably, there are a plurality of magnetostrictive bodies each effective to change the profile of the blade at a different point along the length of the blade.
Each magnetostrictive body is suitably made of dysprosium terbium iron alloy. A suitable alloy is Terfenol.
One blade control system, in accordance with an embodiment of the invention, will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a schematic diagram of a blade control system in accordance with the invention shown with a blade incorporated; Figure 2 is a detail of the blade control system of Figure 1 illustrating schematically the principle of operation of the system; and Figure 3 illustrates the magnetic field against strain characteristics of the magnetostrictive material incorporated in the system of Figure 1.
Referring firstly to Figure 1, the blade control system to be described incorporates a fixed yoke 1 which is rigidly mounted on a machine bed 3. A coating blade 5 is connected to the fixed yoke 1 by means of six actuators 7.
Referring now also to Figure 2, each actuator 7 comprises a magnetostrictive rod of Terfenol 9 of typical composition Dy0 7Tbo 3Fel 95 Across each rod 9 there is connected a respective flat coil spring 11, effective to provide a compressive uniaxial pressure across the bar 9, this compressive pressure being necessary to obtain sufficient expansions of the rods 9 as will be described in more detail hereafter.
In use of the blade control system, suitable magnetic fields are applied to the actuators 7 such that expansion or contraction of the actuators 7 causes forces to be exerted on the blade 5 sufficient to change the profile of the blade to the required form. It will be appreciated that the change of the profile of the blade 5 will generally be achieved by some of the actuators 7 pushing on the blade 5, while others pull on the blade 5, this being illustrated in Figure 2. If the blade profile at a particular point is changed by pulling with an actuator 7, the relevant spring 11 must be sufficiently strong to put the associated Terfenol rod 9 under a compressive force and to pull the blade 5 towards the yoke 1.If, however, the blade profile at any particular point is to be changed by pushing with an actuator 7, the relevant Terfenol rod 9 must be of sufficient diameter such that by application of the necessary magnetic field, a force will be generated which not only acts against the compressive force of the associated spring, but deforms the blade 5. The springs 11 will therefore, be designed to have a very high spring constant so as to enable the blade 5 to be pulled towards the yoke 1 when necessary. The springs 11 will, however, be long enough such that the displacement of any particular spring does not significantly affect the forces acting on adjacent springs. In particular net tensile forces acting on the rods 9 must be avoided, as Terfenol does not exhibit magnetostrictive properties when acting under a tensile stress.
Referring now to Figure 3, this Figure illustrates the variation in strain produced in the magnetostrictive rods 9 with applied field, for different values of pressure applied by the springs 11 to the rods 9. In order to obtain a working strain range of between 250 ppm and 750 ppm for the Terfenol rods, with the necessary applied magnetic field strengths being of up to about 25 kA/m which are readily available, it will be necessary for the springs 11 to apply a compressive force of between 8 and 14 MPa to the rods 9.
It will be appreciated that other materials, other than Terfenol, may be used for the rods 9. Such materials will, however, normally also comprise rare earth iron compounds, or alloys.
It will also be appreciated that whilst the springs 11 are shown connected across the end of the actuator rods 9, other spring configurations which will produce the necessary compressive forces on the rods 9 may also be used.

Claims (9)

1. A blade control system including at least one body of magnetostrictive material effective to change the profile of a blade when a magnetic field is applied to the magnetostrictive body.
2. A blade control system according to claim 1, including means effective to keep the magntostrictive body under a compressive force.
3. A blade control system according to claim 2, in which the compressive force means is a spring means.
4. A blade control system according to claim 3, in which the spring means comprises a compression spring connected across the magnetostrictive body.
5. A blade control system according to any of the preceding claims, in which the magnetostrictive body is made of a rare earth iron alloy.
6. A blade control system according to claim 5, in which the magnetostrictive body is made of dysprosium terbium iron alloy.
7. A blade control system according to claim 6, in which the alloy is Terfenol.
8. A blade control system according to any one of the preceding claims, including a plurality of said magnetostrictive bodies, each effective to change the profile of the blade at a different point along the length of the blade.
9. A blade control system substantially as hereinbefore described with reference to the accompanying drawings.
GB9118801A 1991-09-03 1991-09-03 Blade control system Expired - Fee Related GB2259262B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9118801A GB2259262B (en) 1991-09-03 1991-09-03 Blade control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9118801A GB2259262B (en) 1991-09-03 1991-09-03 Blade control system

Publications (3)

Publication Number Publication Date
GB9118801D0 GB9118801D0 (en) 1991-10-16
GB2259262A true GB2259262A (en) 1993-03-10
GB2259262B GB2259262B (en) 1995-04-12

Family

ID=10700824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9118801A Expired - Fee Related GB2259262B (en) 1991-09-03 1991-09-03 Blade control system

Country Status (1)

Country Link
GB (1) GB2259262B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017097949A1 (en) * 2015-12-09 2017-06-15 Ba Assembly & Turnkey Systems Gmbh Spreading unit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH571952A5 (en) * 1973-10-25 1976-01-30 Zimmer Johannes Scraper blade arrangement - has magnetic bar interchangeable in mounting behind blade
DE3436371A1 (en) * 1983-10-10 1985-04-18 Zimmer, Johannes, Klagenfurt, Kärnten Arrangement for coating webs of material
EP0311745A1 (en) * 1987-10-10 1989-04-19 Johannes Zimmer Coating device
EP0403749A2 (en) * 1989-06-22 1990-12-27 J.M. Voith GmbH Coating apparatus
EP0408704A1 (en) * 1989-01-09 1991-01-23 Johannes Zimmer Arrangement for applying substances to a web of material.
EP0429590A1 (en) * 1989-06-16 1991-06-05 Johannes Zimmer Coating machine with magnetically operated squeegee.
EP0433415A1 (en) * 1989-07-06 1991-06-26 Johannes Zimmer Device for applying free-flowing or spreadable substances, or for applying such substances and removing the excess, or for applying measured quantities of such substances.
AT393465B (en) * 1990-01-26 1991-10-25 Zimmer Johannes Doctor device pressed down by a magnet arrangement by means of magnetic force and having a doctor bar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9021539D0 (en) * 1990-10-03 1990-11-14 Armstrong World Ind Inc Method and apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH571952A5 (en) * 1973-10-25 1976-01-30 Zimmer Johannes Scraper blade arrangement - has magnetic bar interchangeable in mounting behind blade
DE3436371A1 (en) * 1983-10-10 1985-04-18 Zimmer, Johannes, Klagenfurt, Kärnten Arrangement for coating webs of material
EP0311745A1 (en) * 1987-10-10 1989-04-19 Johannes Zimmer Coating device
EP0408704A1 (en) * 1989-01-09 1991-01-23 Johannes Zimmer Arrangement for applying substances to a web of material.
EP0429590A1 (en) * 1989-06-16 1991-06-05 Johannes Zimmer Coating machine with magnetically operated squeegee.
EP0403749A2 (en) * 1989-06-22 1990-12-27 J.M. Voith GmbH Coating apparatus
EP0433415A1 (en) * 1989-07-06 1991-06-26 Johannes Zimmer Device for applying free-flowing or spreadable substances, or for applying such substances and removing the excess, or for applying measured quantities of such substances.
AT393465B (en) * 1990-01-26 1991-10-25 Zimmer Johannes Doctor device pressed down by a magnet arrangement by means of magnetic force and having a doctor bar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017097949A1 (en) * 2015-12-09 2017-06-15 Ba Assembly & Turnkey Systems Gmbh Spreading unit
RU2720779C2 (en) * 2015-12-09 2020-05-13 Бретье-Аутомацион Гмбх Lubricating device

Also Published As

Publication number Publication date
GB2259262B (en) 1995-04-12
GB9118801D0 (en) 1991-10-16

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