EP0681874A2 - Vorrichtung zur kontinuierlichen Abgabe dichter und/oder viskoser Werkstoffen, mit einer koaxialen gleitenden zylindrischen Stange - Google Patents

Vorrichtung zur kontinuierlichen Abgabe dichter und/oder viskoser Werkstoffen, mit einer koaxialen gleitenden zylindrischen Stange Download PDF

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Publication number
EP0681874A2
EP0681874A2 EP95200887A EP95200887A EP0681874A2 EP 0681874 A2 EP0681874 A2 EP 0681874A2 EP 95200887 A EP95200887 A EP 95200887A EP 95200887 A EP95200887 A EP 95200887A EP 0681874 A2 EP0681874 A2 EP 0681874A2
Authority
EP
European Patent Office
Prior art keywords
rod
cavity
cylindrical
adhesive
coaxially
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Withdrawn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
EP95200887A
Other languages
English (en)
French (fr)
Other versions
EP0681874A3 (de
Inventor
Walter Ricci
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.)
Sagitta Officina Meccanica SpA
Original Assignee
Sagitta Officina Meccanica SpA
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 Sagitta Officina Meccanica SpA filed Critical Sagitta Officina Meccanica SpA
Publication of EP0681874A2 publication Critical patent/EP0681874A2/de
Publication of EP0681874A3 publication Critical patent/EP0681874A3/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Withdrawn legal-status Critical Current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
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet

Definitions

  • the present invention relates to a device for the continuous delivery of uniform quantities of dense and viscous fluid substances, in particular adhesives and similar paste-like substances.
  • delivery/metering devices which substantially consist of a tubular delivery body which has arranged inside it a coaxial rod displaceable in either direction by means of an actuating group in the form of a double-acting piston; an annular cavity is provided between said rod and the cylindrical internal surface of the tubular body, via which the adhesive, introduced under pressure, reaches the free end of the tubular body.
  • the end of said displaceable rod also comprises an obturator with an enlarged, substantially frusto-conical head which alternately closes and opens the end of the tubular body.
  • the sealing means of the end obturator are not always able to prevent dripping of the glue, when the delivery device is closed, owing to glue dust and/or particles which may collect between the obturator and its seat or also owing to wear of the contact surfaces, due to prolonged use of the delivery device.
  • the sealing means between the line of the duct feeding glue into the cavity and the sealing member integral with the sliding rod which effects closure thereof are not always able to prevent the glue, under pressure, from rising up along the rod itself and along the stem of the piston, stopping against the skirt of the double-acting cylinder, and from hardening with the passing of time.
  • the lack of an effective sealing action between the obturator and its closing seat may result, in addition to the dripping of glue when the delivery device is at rest, also in the infiltration of air into the annular cavity, thus causing hardening of the glue present in the said cavity and adversely affecting subsequent operation of the delivery device.
  • the technical problem which is posed, therefore, is that of providing a device for the continuous delivery of uniform quantities of dense fluid substances with a constant cross-section, in particular adhesives of the polymerizable type, designed to eliminate the drawbacks and the limitations of use of known delivery devices, without substantial variations in the overall dimensions nor substantial additional costs compared to those of known delivery devices.
  • the main aim is that of providing a device for the delivery of adhesives and similar dense and/or viscous substances, structured so as to prevent both the dripping of glue through the obturator and the seat of the end of the end of the tubular supply body, and the infiltration of air into the cavity when the obturator is closed.
  • Another aim of the invention is to provide a delivery device of the type specified above, designed to allow easy and rapid replacement of the type of adhesive to be supplied under pressure and ensure efficient and regular operation with any type of adhesive or similar substance.
  • a device for the continuous delivery of dense and/or viscous substances, in particular adhesives of the polymerizable type comprising a tubular delivery body with a cylindrical rod coaxially sliding, alternately, inside it by means of a double-acting piston so as to create an annular cavity connected to a source supplying adhesive under pressure, said rod being provided with substantially conical obturator means at its free end, said device comprising, coaxially with said conical obturator and in the vicinity thereof, at least two sealing members consisting of enlarged parts, integral with said rod and sliding inside chambers or countersunk zones formed on the internal surface of the tubular body, so as to seal off the end of the cavity only when the delivery device is closed and prevent the entry of air into the cavity itself, there also being provided at the opposite end of said annular cavity at least another sealing member, consisting of a cylindrical body, coaxial with said rod and sliding inside a chamber of larger diameter formed in the cylindrical body, below the aperture for introducing the supply of
  • said two sealing members, integral with the conical obturator consist respectively of a frusto-conical body or enlarged part coaxial with said rod and displaceable inside a chamber so as to ensure sealing by means of contact against a toroidal ring coaxially integral with the external surface of the conical body, and of a cylindrical enlarged part, coaxial with the rod displaceable inside a chamber, designed to ensure sealing by insertion inside a cylindrical annular shoulder projecting coaxially from said cylindrical body, immediately above the displacement chamber of said enlarged part.
  • the delivery device forming the subject of the present invention substantially consists of a hollow cylindrical body 1 closed at the top by an end-piece 1a and, at the bottom, by a similar end-piece 1b. It has slidably mounted inside it a piston 2 of the double-acting type, which is displaceable with a predetermined and adjustable travel by means of air introduced under pressure, alternately, through the ducts 3 and 3a.
  • the stem 2a passing through the bottom end-piece 1b, has axially connected to it, by means of screwing, a cylindrical rod 4 sliding inside a straight tubular body 5 connected to the bottom end-piece 1b of the cylinder 1.
  • Said rod 4 has a constant diameter less than the internal diameter of the tubular housing body 5, so as to create between rod and tubular body a cylindrical cavity 6 intended to convey the adhesive supplied to the top of said cavity by means of a duct 7 which in turn is connected to a source supplying the adhesive under a suitable pressure, said source being of the known type and not shown in the figures.
  • the bottom end of said rod 4, emerging partially from the end of the tubular body 5, is shaped substantially in the form of a truncated cone 8 and more precisely with the conical surface 8a towards the inside, so as to form a member closing off the end of the cavity 6 by sealingly fitting against the end of the mouth 5a of the tubular body 5, the annular edge of which is correspondingly countersunk.
  • the obturator 8 closes the cavity 6, stopping adhesive introduced inside the cavity itself from emerging, while with each displacement of the obturator 8 towards the outside of the tubular body 5, the adhesive is able to emerge (in the direction of the arrows F in Figure 2) in the form of a cylindrical layer which then, after flowing round the external surface of the obturator, is united in the form of a continuous thread or strand.
  • the bottom end of the obturator 8 has inserted inside it a freely rotating ball 9 designed to facilitate sliding of the end of the tubular body 5 on the surface onto which the strand of adhesive is to be applied.
  • the present invention envisages the application of a plurality of sealing members to prevent any dripping of glue in the event of a poor sealing action of the obturator 8 and the entry of air inside the cavity 6 when the obturator is closed, as well as additional sealing members inside the delivery device, designed to shut off securely the aperture of the duct 7 which introduces the adhesive into the cavity 6.
  • Said bottom sealing members substantially consist of a first frusto-conical enlarged part 10, coaxially integral with the rod 4 and sliding inside a chamber 11 formed by means of a countersunk zone in the cylindrical wall of the tubular body 5; the seal preventing adhesive and air entering the cavity is provided by means of insertion of the larger-diameter zone of the conical enlarged part 10 within a toroidal ring 12, integral with the external surface of the conical body 10. Therefore, with each opening travel movement of the obturator 8, the enlarged part 10 is also displaced, returning inside the chamber 11 and thus allowing the adhesive to continue towards the exit point.
  • An additional sealing member consisting of a small cylinder 13 coaxially integral with the rod 4, is provided above and coaxial with said frusto-conical seal 10, said sealing member also being displaceable inside a cylindrical chamber 14 and forming the seal by means of insertion inside an annular shoulder 15 emerging radially from the internal cylindrical surface of the tubular body 5.
  • the simultaneous displacement of the three sealing members, i.e. the obturator 8, the frusto-conical enlarged part 10 and the cylindrical body 14, ensures a sealing action preventing any dripping of adhesive when the obturator is closed and infiltration of air into the cavity 6; consequently, the cavity of the delivery device may be kept filled with adhesive without the danger of hardening and/or alteration.
  • the inlet aperture of the supply pipe 7 into the cavity 6 is provided with an additional cylindrical chamber 16 formed in the internal surface of the cylindrical body 5 and having a greater diameter than the cavity 6, inside which a small cylinder 17 is displaceable, said cylinder being intended to shut off the aperture of the duct 7 (Figure 1) at the same time as closure of the bottom sealing members 8a, 10 and 14.
  • the stem 2a of the piston is provided with a toroidal seal 18 designed to prevent the adhesive under pressure from rising up along the stem, as well as a toroidal seal 19 providing a sealing action preventing the air actuating the piston from escaping.
  • the improved delivery device comprises moreover a tubular block 20 associated with the supply duct 7, which block comprises conventional unidirectional valve means consisting of a ball 20a biased by a spring 20b against a seat 20c for rapid engagement with the tube 21 connected to the source supplying adhesive under pressure, so as to allow easy and rapid changing of the type of adhesive, whenever required.

Landscapes

  • Coating Apparatus (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP95200887A 1994-04-13 1995-04-07 Vorrichtung zur kontinuierlichen Abgabe dichter und/oder viskoser Werkstoffen, mit einer koaxialen gleitenden zylindrischen Stange. Withdrawn EP0681874A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940272 IT233246Y1 (it) 1994-04-13 1994-04-13 Dispositivo di erogazione continua di sostanze dense e/o vischiose con asta cilindrica coassialmente scorrevole
ITMI940272U 1994-04-13

Publications (2)

Publication Number Publication Date
EP0681874A2 true EP0681874A2 (de) 1995-11-15
EP0681874A3 EP0681874A3 (de) 1996-06-12

Family

ID=11367873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200887A Withdrawn EP0681874A3 (de) 1994-04-13 1995-04-07 Vorrichtung zur kontinuierlichen Abgabe dichter und/oder viskoser Werkstoffen, mit einer koaxialen gleitenden zylindrischen Stange.

Country Status (2)

Country Link
EP (1) EP0681874A3 (de)
IT (1) IT233246Y1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850697A3 (de) * 1996-12-23 1999-07-21 Nordson Corporation Vorrichtung zum Auftragen von fliessfähigem Material auf ein Substrat, insbesondere zum intermittierenden Auftragen von flüssigem Klebstoff
JP2014089963A (ja) * 1999-11-29 2014-05-15 Semiconductor Energy Lab Co Ltd 発光装置の作製方法
CN103977933A (zh) * 2014-05-15 2014-08-13 肖根福罗格注胶技术(苏州工业园区)有限公司 双电机控制单嘴计量注胶设备
CN114273157A (zh) * 2021-12-02 2022-04-05 包娴英 一种电子元件高效点胶用快速风干设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4678100A (en) * 1985-06-17 1987-07-07 Loctite Corporation Variable flow rate dispensing valve assembly
US5065910A (en) * 1989-06-30 1991-11-19 Fiedler Edgar F Dispenser head for flowable materials
EP0565972A1 (de) * 1992-04-09 1993-10-20 Harald Wallner Klebstoffauftragventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4678100A (en) * 1985-06-17 1987-07-07 Loctite Corporation Variable flow rate dispensing valve assembly
US5065910A (en) * 1989-06-30 1991-11-19 Fiedler Edgar F Dispenser head for flowable materials
EP0565972A1 (de) * 1992-04-09 1993-10-20 Harald Wallner Klebstoffauftragventil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850697A3 (de) * 1996-12-23 1999-07-21 Nordson Corporation Vorrichtung zum Auftragen von fliessfähigem Material auf ein Substrat, insbesondere zum intermittierenden Auftragen von flüssigem Klebstoff
US6164568A (en) * 1996-12-23 2000-12-26 Nordson Corporation Device for applying free-flowing material to a substrate, in particular for intermittent application of liquid adhesive
JP2014089963A (ja) * 1999-11-29 2014-05-15 Semiconductor Energy Lab Co Ltd 発光装置の作製方法
CN103977933A (zh) * 2014-05-15 2014-08-13 肖根福罗格注胶技术(苏州工业园区)有限公司 双电机控制单嘴计量注胶设备
CN103977933B (zh) * 2014-05-15 2016-08-24 肖根福罗格注胶技术(苏州工业园区)有限公司 双电机控制单嘴计量注胶设备
CN114273157A (zh) * 2021-12-02 2022-04-05 包娴英 一种电子元件高效点胶用快速风干设备

Also Published As

Publication number Publication date
ITMI940272V0 (it) 1994-04-13
ITMI940272U1 (it) 1995-10-13
IT233246Y1 (it) 2000-01-26
EP0681874A3 (de) 1996-06-12

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