EP0106593A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Nozzle control apparatus
Assignee: Wiggins Teape Group Ltd
•
Filing: 1983-09-28
•
Granted: —
•
Expires: 2003-09-28
Abstract
Abstract An elongate nozzle (30), such as provided by a slice (20) in the delivery of feed stock from a headbox (12) to the Foudrinier wire (24) of a paper-making machine or by the lips of a sheet plastics extrusion die, has its delivery height profile (5) adjustable at points along the nozzle (30) by electro-hydraulic actuator devices (40) which are coupled to the upper slice lip (26) or one lip of the extrusion die. Each device (40) comprises a servo motor (130) whose piston (48) is coupled to the lip (26) and an electrically energized torque motor (110) which controls the servo motor (130) via a servo control valve (120). Each actuator (40) has a linear voltage differential transformer (LVDT) (60) connected with it to measure the local delivery height (5) of the nozzle (30). The torque motor (110) is controlled by an error signal dependent on the difference between an input signal (136) representing a desired height and a signal (132) from the LVDT representing actual height. In a paper-making machine the actuators (40) may be controlled by a computer (150) that determines a nozzle profile (5) in dependence upon a grammage profile measurement made on the paper web (174). The hydraulic fluid for a paper-making machine is preferably water-based to minimise contamination if leakage occurs.
Inventors
- 👤 Peter Thomas Herdman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 21:10
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/313; B29C48/92; D21F1/028; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92076; B29C2948/92114; B29C2948/92323; B29C2948/92361; B29C2948/92409; B29C2948/92504; B29C2948/92571; B29C2948/92819; B29C2948/92857; B29C2948/92904
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
195 words
Apparatus comprising first (26) and second (24) relatively displaceable parts defining an elongate nozzle (30) through which a flowable material is deliverable, the parts being relatively displaceable to control the delivery height (5) of the nozzle (30), and control means for adjusting the delivery height (5) comprising a plurality of adjustment devices (40) mounted at locations across the width of the nozzle (30) and each connected to one of said parts (24, 26) to locally adjust the delivery height (5), characterised in that each device (40) comprises an actuator (100) including an hydraulic servo motor (130) having an output member (50) connected to the said one part and means (110, 120, 140) for controlling the servo motor (130) in response to an input signal (136) representing a desired local position of the said one part to which the device (40) is connected, a displacement measuring device (60) connected to said output member (50) to provide a signal (132) representing the position of said output member, and said control means (100) including means (134) for comparing the input signal (136) with the position signal (132) to control the servo motor (130) in dependence upon the comparison.
Claim 2
Dependent Claim
195 words
Apparatus comprising first (26) and second (24) relatively displaceable parts defining an elongate nozzle (30) through which a flowable material is deliverable, the parts being relatively displaceable to control the delivery height (5) of the nozzle (30), and control means for adjusting the delivery height (5) comprising a plurality of adjustment devices (40) mounted at locations across the width of the nozzle (30) and each connected to one of said parts (24, 26) to locally adjust the delivery height (5), characterised in that each device (40) comprises an actuator (100) including an hydraulic servo motor (130) having an output member (50) connected to the said one part and means (110, 120, 140) for controlling the servo motor (130) in response to an input signal (136) representing a desired local position of the said one part to which the device (40) is connected, a displacement measuring device (60) connected to said output member (50) to provide a signal (132) representing the position of said output member, and said control means (100) including means (134) for comparing the input signal (136) with the position signal (132) to control the servo motor (130) in dependence upon the comparison.
Claim 3
Dependent Claim
69 words
Apparatus as claimed in Claim 1 in which said control means (100)comprises a servo control valve (120) to control the flow of pressure fluid to said servo motor (130) and an electrically energized motor (110) to control the position of said servo control valve (120), said electrically energized motor (110) being energized by a signal dependent on the comparison of the input signal (136) and the position-representing signal (132).
Claim 4
Dependent Claim
33 words
Apparatus as claimed in Claim 1 or 2 in which the output member (50) of each adjustment device (40) is connected to said first part (26) and the second part (24) is fixed.
Claim 5
Dependent Claim
52 words
Apparatus as claimed in Claim 3 in which each displacement measuring device (60) comprises two relatively movable portions whose relative displacement is sensed, one portion (62) being coupled to the output member (50) of the servo motor (130) and the other portion supported fixedly with respect to said second fixed part (24).
Claim 6
Dependent Claim
55 words
Apparatus as claimed in Claim 1 or 2 in which said displacement measuring device (60) comprises two relatively movable portions whose relative displacement is sensed, one portion (62) being coupled to the output member (50) of the servo motor (130) and the other portion supported fixedly with respect to a bed portion of the apparatus.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in any preceding claim in which each said displacement measuring device (60) is a linear voltage differential transformer.
Claim 8
Dependent Claim
185 words
A paper-making machine in which -feed stock is delivered from a headbox (12) on to a wire (22) through a slice (20) for controlling the delivery of the stock, the slice (20) comprising a movable part (26) extending across the wire to control the delivery height (5) of the slice, and the machine including a plurality of adjustment devices (40) mounted at locations across the wire (22) and connected to the movable part (26) to locally adjust the delivery height (5), wherein each device (40) comprises an actuator (100) including an hydraulic servo motor (130) having an mtput member (50) connected to said part (26) and means (110, 120) for controlling the servo motor (130) in response to an input signal (136) representing a desired local position of said part, a displacement measuring device (60) connected to said output member (50) to provide a signal (132) representing the position of said output member, and said control means (110, 120, 140) including means (134) for comparing the input signal (136) with the position signal (132) to control the servo motor (130) in dependence upon the comparison.
Claim 9
Dependent Claim
185 words
A paper-making machine in which -feed stock is delivered from a headbox (12) on to a wire (22) through a slice (20) for controlling the delivery of the stock, the slice (20) comprising a movable part (26) extending across the wire to control the delivery height (5) of the slice, and the machine including a plurality of adjustment devices (40) mounted at locations across the wire (22) and connected to the movable part (26) to locally adjust the delivery height (5), wherein each device (40) comprises an actuator (100) including an hydraulic servo motor (130) having an mtput member (50) connected to said part (26) and means (110, 120) for controlling the servo motor (130) in response to an input signal (136) representing a desired local position of said part, a displacement measuring device (60) connected to said output member (50) to provide a signal (132) representing the position of said output member, and said control means (110, 120, 140) including means (134) for comparing the input signal (136) with the position signal (132) to control the servo motor (130) in dependence upon the comparison.
Claim 10
Dependent Claim
74 words
A paper-making machine as claimed in Claim 7 in which said control means (110, 120, 140) comprises a servo control valve (120) to control the flow of pressure fluid to said servo motor (130) and an electrically energized motor (110) to control the position of said servo control valve (120), said electrically energized motor (110) being energized by a signal dependent on the comparison of the input signal (136) and the position-representing signal (132).
Claim 11
Dependent Claim
60 words
A paper-making machine as claimed in Claim 7 or 8 in which said displacement measuring device (60) comprises two relatively movable portions whose relative displacement is sensed, one portion (62) being coupled to the output member (50) of the servo motor (130) and the other portion supported fixedly with respect to a second fixed part (24) of the slice (20).
Claim 12
Dependent Claim
56 words
A paper-making machine as claimed in Claim 7 or 8 in which said displacement measuring device (60) comprises two relatively movable portions whose relative displacement is sensed, one portion (62) being coupled to the output member (50) of the servo motor (130) and the other portion supported fixedly with respect to the bed of the machine.
Claim 13
Dependent Claim
19 words
A paper-making machine as claimed in Claim 8 in which the hydraulic fluid for each actuator (100) is water-based.
Claim 14
Dependent Claim
21 words
A paper-making machine as claimed in Claim 11 in which the hydraulic fluid is a mixture of water and ethylene glycol.
Claim 15
Dependent Claim
124 words
A paper-making machine as claimed in Claim 8 further comprising a computer (150) connected to each adjustment device (40) to supply said input signal (136) thereto; a gauge device (170) mounted downstream of said wire (22) to measure the grammage profile of the paper web (174) across the width of the web, said gauge device (170) being coupled to said computer (150) to supply profile-measurement signals thereto, and said computer storing a desired grammage profile for the web and being programmed to compute a profile for the delivery height (S) of the nozzle (30) that will produce the desired grammage profile and to supply input signals (136) to said adjustment devices (40) in accord with the computed profile for the nozzle delivery height (S).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.