EP0901833A2 - Pulverzufuhrvorrichtung zur Pulverbeschichtung von Werkstücken mit einem Gewinde - Google Patents

Pulverzufuhrvorrichtung zur Pulverbeschichtung von Werkstücken mit einem Gewinde Download PDF

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Publication number
EP0901833A2
EP0901833A2 EP98650061A EP98650061A EP0901833A2 EP 0901833 A2 EP0901833 A2 EP 0901833A2 EP 98650061 A EP98650061 A EP 98650061A EP 98650061 A EP98650061 A EP 98650061A EP 0901833 A2 EP0901833 A2 EP 0901833A2
Authority
EP
European Patent Office
Prior art keywords
powder
flow
continuous
tube
feeding device
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Withdrawn
Application number
EP98650061A
Other languages
English (en)
French (fr)
Other versions
EP0901833A3 (de
Inventor
Richard J. Duffy
Eugene Sessa
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.)
Nylok LLC
Original Assignee
Nylok Fastener Corp
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 Nylok Fastener Corp filed Critical Nylok Fastener Corp
Publication of EP0901833A2 publication Critical patent/EP0901833A2/de
Publication of EP0901833A3 publication Critical patent/EP0901833A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1468—Arrangements for supplying particulate material the means for supplying particulate material comprising a recirculation loop
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1477—Arrangements for supplying particulate material means for supplying to several spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/04—Apparatus specially adapted for applying particulate materials to surfaces the particulate material being projected, poured or allowed to flow onto the surface of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials

Definitions

  • This invention is generally directed to a powder application system and, more specifically, to an improved powder metering and feeding system for spraying powder onto threaded articles such as nuts in the manufacture of prevailing torque fasteners.
  • Powder feeding systems for applying powder to threaded articles have long been know. Powder feeding systems are inherently more accurate when they are operated continuously, i.e., in a steady-state condition, rather than operated in an intermittent or go-and-stop fashion. Intermittent operation is prone to powder surges on start-up and powder dribble at the end of a spray cycle.
  • the present invention may be used with powder applicators, such as those disclosed in U.S. Patent No. 5,362,327, to provide more consistent torque values in the resulting product.
  • a continuous-flow powder feeding device for applying powder to a threaded article.
  • the device includes a powder source; a powder spray tube for delivery of powder to the threaded article; a powder by-pass tube for delivery of powder to a collector for receiving powder; and a powder supply tube in communication with the powder source and in selective communication with either the powder spray or powder by-pass tubes.
  • the powder supply tube continuously moves powder through it with the aid of pressurized air.
  • the device automatically moves the powder supply tube into selective communication with the powder spray tube in response to a signal that the threaded article is in a powder application position.
  • the device automatically moves the powder supply tube into selective communication with the powder by-pass tube in response to a signal that powder has been applied to the threaded fastener.
  • the device may be used to form a patch on the threaded fastener, and the variation in installation torque of the resulting threaded article is minimized, and relatively uniform.
  • the device includes a shuttle valve carrying the powder spray and powder by-pass tubes, and an actuator for automatically moving the shuttle valve in response to the signal.
  • the actuator may take the form of a solenoid or air cylinder, as nonlimiting examples.
  • a powder metering apparatus such as a helical auger, may be used in conjunction with the device for delivering a relatively constant amount of powder from the powder source to the powder supply tube.
  • the present invention involves a method for applying powder to a threaded article employing a continuous-flow powder feeding device.
  • a powder source and a powder spray tube for delivering powder from the powder source to the threaded article are provided, as well as a powder by-pass tube for delivering powder to the powder source or to a second collector for receiving powder.
  • a powder supply tube in selective communication with either the powder spray or powder by-pass tubes is also provided. Powder is continuously moved from the powder source through the powder supply tube using pressurized air. The powder supply tube is automatically moved into selective reciprocating communication with the powder spray tube or with the powder by-pass tube, depending on whether the threaded article is in a position for powder to be applied. Preferably, the powder supply tube is moved in response to a signal indicative of the position of the threaded article.
  • the present invention employs a by-pass line for the powder stream, to provide an intermittent-flow powder application operation, while also taking advantage of the accuracy of a continuous-flow powder application operation.
  • the by-pass line diverts the powder stream during the non-spray portion of the machine cycle.
  • a mechanism is also provided to divert the powder stream from the by-pass line to the spray or application line during the spray portion of the cycle.
  • FIGURE 1 a preferred embodiment of the intermittent-flow powder feed apparatus of the present invention is generally referred to by reference numeral 10.
  • a shuttle valve 20 having a valve body 40 slides along rod 33, and is shown in the by-pass position labeled "A".
  • a relatively constant flow of metered powder flowing in the direction of the arrows, is drawn from a feeder discharge (not shown) by negative pressure developed downstream from shuttle valve 20.
  • the powder passes into by-pass line 25 where it is directed to a suitable collector or returned to a feeder supply hopper (neither enclosure is shown).
  • a threaded article to which powder is to be applied is sensed to be in the proper position for spraying.
  • actuator 30 shifts shuttle valve 20 to the spray position labeled "B".
  • the powder stream passes through aperture 20A within shuttle valve 20, into spray line 35, and is deposited on the threads of the article.
  • a second signal activates actuator 30 to shift shuttle valve 20 back to by-pass position A at the same time that the sprayed article is discharged. Also at this same time, the next threaded article moves into the spray position, causing another signal to be generated, and the process is repeated.
  • Negative pressure may be continuously developed in both the spray and by-pass lines by air jets, as those of ordinary skill in the art will appreciate from the disclosures in U.S. Patent Nos. 5,620,520 and 5,620,741, each of which is incorporated by reference herein.
  • the samples shown in FIGURES 4-7 (all airflow measurements are in SCFM) were M8 nuts processed with an air vacuum at about 45 SCFM and at a spray speed of about 9.5 SCFM. These figures will vary depending upon the size and type of fastener, and the desired processing speeds and other parameters.
  • Actuator 30 may take the form of either a single or double-acting air cylinder, or a solenoid, or any other fast-acting, linear actuators, for example.
  • a Husky compact cylinder, Model SFM 118 v. 38 VC3 CB555 may be used, and connected to air fitting 43.
  • Signals for activating actuator 30 may be electrical or fluidic in nature; if electrical, they may be generated using fiber optic sensors or microswitches, for example.
  • valve stem 47 may be shuttled between stops for more precise positioning alignment within shuttle valve 20.
  • the powder metering device for supplying powder to powder feed apparatus 10 consists of two stacked funnels and a vibrator (not shown). Each funnel is initially filled with powder, and the larger funnel is located on top of the smaller funnel, with the discharge opening of the larger funnel being flush with the powder level of the smaller, lower funnel. Thus, as the power level of the lower funnel increases, it eventually reaches a level such that the powder flow through the upper funnel is automatically shut off. Vibration of the funnels occurs continuously. This approach has been found to provide a desirable, relatively constant powder flow.
  • the present invention may be used to accommodate virtually any type of powder feeder which possesses the capability of providing the required accurate metered flow.
  • an AccuRate helical dry powder feeder available from Schenck AccuRate® of White Water, Wisconsin, or a modified stacked funnel ⁇ valve, vibration-type feeder as described above or in U.S. Patent No. 5,571,323, incorporated herein by reference, may be used.
  • shuttle valve 20 may be modified as shown to process two or more threaded articles, such as nuts, simultaneously.
  • spray tubes 35A, 35B receive powder.
  • Tubes 25A, 25B are the by-pass tubes, while tubes 35A, 35B, are the spray tubes. Again, powder flow is shown by the direction of the arrows.
  • Cylinder 30 is shown in FIGURE 3 in the extended position, with powder flowing through spray tubes 35A, 35B.
  • cylinder 30 retracts, powder flows through by-pass tubes 25A, 25B.
  • L-shaped bracket 46 and threaded fastener 48 mount shuttle valve 20 and cylinder 30 to a suitable fixture.
  • a clevis bracket, generally designated as 55 joins valve stem 47 to cylinder 30 using sleeve 55A, pin 55B, threaded mount 55C and rod 55D.
  • Valve stem 47 moves relative to plate 60, which is fixed by fastener 48 to L-shaped bracket 46.
  • Fixed plate 60 includes apertures 60A, which house the ends of tubes 25A, 25B, and 35A 1 , 35B 1 .
  • FIGURES 4-5 comparison test results are shown in graph form.
  • actual installation torque is shown for nuts processed on a single-nozzle intermittent powder feeding system as described in U.S. Patent No. 5,362,327.
  • the variation in installation torque i.e., the difference between the actual value and the mean value
  • Sigma i.e., the measure of the degree of scatter
  • FIGURE 6 shows the variation in installation torque, similar to FIGURE 5, but for the use of a double-nozzle powder feeding system according to the present invention (as shown in FIGURES 2-3).
  • the Sigma values are as follows: 0.239 (for the entire sample); 0.253 (front nozzle); 0.201 (rear nozzle); 0.223 (first 20-lot samples); and 0.252 (second 20-lot samples). These Sigma values demonstrate the torque uniformity between the two nozzles, and also the torque uniformity over time.
  • FIGURE 7 shows the torque variation in a continuous system (such as that according to U.S. Patent No. 4,100,882); the Sigma value is 0.511.
  • the powder feeding systems of the present invention may be used to form a patch on a self-locking fastener, or to apply a masking or lubricating coating (of, eg, Teflon) as taught in U.S. Patent No. Re. 33,366.
  • a masking or lubricating coating of, eg, Teflon

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  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Tyre Moulding (AREA)
  • Fertilizing (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
EP98650061A 1997-09-10 1998-09-10 Pulverzufuhrvorrichtung zur Pulverbeschichtung von Werkstücken mit einem Gewinde Withdrawn EP0901833A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92660197A 1997-09-10 1997-09-10
US926601 1997-09-10

Publications (2)

Publication Number Publication Date
EP0901833A2 true EP0901833A2 (de) 1999-03-17
EP0901833A3 EP0901833A3 (de) 2000-12-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98650061A Withdrawn EP0901833A3 (de) 1997-09-10 1998-09-10 Pulverzufuhrvorrichtung zur Pulverbeschichtung von Werkstücken mit einem Gewinde

Country Status (4)

Country Link
EP (1) EP0901833A3 (de)
KR (1) KR19990029777A (de)
AU (1) AU8416498A (de)
CA (1) CA2246924A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20131002A1 (it) * 2013-12-06 2015-06-07 Whitehead Sistemi Subacquei S P A Gruppo per il caricamento di un elettrolita anidro in polvere

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054688A (en) 1975-04-28 1977-10-18 Usm Corporation Method of making locking nuts
US4060868A (en) 1977-01-17 1977-12-06 Usm Corporation Powder applying apparatus and process for making self-locking threaded elements
US4100882A (en) 1976-07-12 1978-07-18 Usm Corporation Apparatus for making locking nuts
USRE33366E (en) 1981-06-16 1990-10-02 Armstrong World Industries, Inc. Rigid, water-resistant phosphate ceramic materials and process for preparing them
US5025750A (en) 1987-07-07 1991-06-25 Nylok Fastener Corporation Apparatus for coating fasteners
US5362327A (en) 1989-10-20 1994-11-08 Nylok Fastener Corporation Apparatus for producing a coating on an internally threaded fastener
US5571323A (en) 1993-08-27 1996-11-05 Nylok Fastener Corporation Powder spray apparatus for the manufacture of coated fasteners
US5620520A (en) 1992-03-12 1997-04-15 Nylok Fastener Corporation Apparatus for producing coated fasteners having closed ends
US5620741A (en) 1994-01-26 1997-04-15 Nylok Fastener Corporation Resin coated fastener and apparatus and method for manufacture of same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805833A (en) * 1971-10-20 1974-04-23 G Teed Back-suction diverter valve
US4138161A (en) * 1977-08-09 1979-02-06 The Continental Group, Inc. Mechanical powder flow diverting device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054688A (en) 1975-04-28 1977-10-18 Usm Corporation Method of making locking nuts
US4100882A (en) 1976-07-12 1978-07-18 Usm Corporation Apparatus for making locking nuts
US4060868A (en) 1977-01-17 1977-12-06 Usm Corporation Powder applying apparatus and process for making self-locking threaded elements
USRE33366E (en) 1981-06-16 1990-10-02 Armstrong World Industries, Inc. Rigid, water-resistant phosphate ceramic materials and process for preparing them
US5025750A (en) 1987-07-07 1991-06-25 Nylok Fastener Corporation Apparatus for coating fasteners
US5362327A (en) 1989-10-20 1994-11-08 Nylok Fastener Corporation Apparatus for producing a coating on an internally threaded fastener
US5620520A (en) 1992-03-12 1997-04-15 Nylok Fastener Corporation Apparatus for producing coated fasteners having closed ends
US5571323A (en) 1993-08-27 1996-11-05 Nylok Fastener Corporation Powder spray apparatus for the manufacture of coated fasteners
US5620741A (en) 1994-01-26 1997-04-15 Nylok Fastener Corporation Resin coated fastener and apparatus and method for manufacture of same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20131002A1 (it) * 2013-12-06 2015-06-07 Whitehead Sistemi Subacquei S P A Gruppo per il caricamento di un elettrolita anidro in polvere
EP2884569A1 (de) * 2013-12-06 2015-06-17 Whitehead Sistemi Subacquei S.p.A. Vorrichtung zum Laden eines Trockenpulverelektrolyts
US9590229B2 (en) 2013-12-06 2017-03-07 Whitehead Sistemi Subacquei S.P.A. Device for loading a powdered water-free electrolyte

Also Published As

Publication number Publication date
KR19990029777A (ko) 1999-04-26
EP0901833A3 (de) 2000-12-06
CA2246924A1 (en) 1999-03-10
AU8416498A (en) 1999-03-25

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