EP0021056A1 - Powder filling of electric cables, with cable vibrating means - Google Patents

Powder filling of electric cables, with cable vibrating means Download PDF

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Publication number
EP0021056A1
EP0021056A1 EP80102883A EP80102883A EP0021056A1 EP 0021056 A1 EP0021056 A1 EP 0021056A1 EP 80102883 A EP80102883 A EP 80102883A EP 80102883 A EP80102883 A EP 80102883A EP 0021056 A1 EP0021056 A1 EP 0021056A1
Authority
EP
European Patent Office
Prior art keywords
cable
unit
powder
bar
cable unit
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Withdrawn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
EP80102883A
Other languages
German (de)
English (en)
French (fr)
Inventor
John Nicholas Garner
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of EP0021056A1 publication Critical patent/EP0021056A1/en
Withdrawn legal-status Critical Current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
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/32—Filling or coating with impervious material
    • H01B13/321—Filling or coating with impervious material the material being a powder

Definitions

  • This invention relates to the powder filling of electric cables, for example cables for telecommunications and is particularly concerned with the filling of cables with units of the cable in a substantially closed condition.
  • the voids between conductors of a cable are filled with a material, for example grease.
  • a material for example grease.
  • Use of grease is inconvenient, both in manufacture and in use. Particularly when the conductors of a cable have to be joined the grease creates problems in obtaining clean joints. It is also messy and unpleasant.
  • the present invention provides a method of filling which gives an improvement in the characteristics of the filled cable.
  • a method of powder filling electric cables by forming a fluidized bed of filling powder, passing a cable or cable unit through the fluidized bed of powder with the conductors of the cable or cable unit substantially closed together, the fluidized powder passing between the substantially closed conductors and into the cable or cable unit, and agitating the cable or cable unit in a direction laterally to the direction of its movement through the bed to distribute the powder throughout the cable or cable unit.
  • vibration or shaking of the cable as defined by the present invention assists in maintaining the fluidity of the powder and thus provides an even higher uniformity of fill and-improves the electrical characteristics of the cable.
  • the present invention provides for vibrating or shaking, or otherwise agitating the cable or cable unit, as it passes through the fluidized bed of powder.
  • the invention also includes apparatus for powder filling electric cables having a housing with a bottom and inlet and outlet ends, at least one inlet at the inlet end and at least one outlet at said outlet end for the passage of a cable or cable unit with its conductors substantially closed together, a porous member towards the bottom of the housing and means for feeding air through said porous member for producing a fluidized bed of powder in the housing for passage of the cable or unit through the bed, and at least one member mounted in the housing for contact with the cable or cable unit, and means for causing the member to vibrate the cable or cable unit as the cable or unit passes through the bed whereby the powder is caused to pass between the substantially closed conductors and is distributed throughout the cable or unit.
  • Figure 1 is a diagrammatic cross-section through one form of apparatus, in a direction normal to the path of the cable through the apparatus, a side view being seen in Figure 5.
  • the forms of apparatus illustrated in Figures 2, 3 and 4 vary only in the particular arrangement for vibrating or shaking the cable and similar reference numerals are used, where applicable.
  • a fluidized bed comprises a housing 10 having a porous plate 11 extending across the housing near the bottom, to define an air chamber 12, to which air is supplied via an inlet 13.
  • a cover 14 fits on3ahe housing and has an exhaust outlet 15 for removal of dust and an inlet 16 for the supply of powder.
  • the conductors 17 of a cable, or cable unit 18 enter the housing 10 via an inlet die 19 and exit via an exit die 20.
  • the cable, or cable unit is in a substantially closed condition, that is the conductors 17 are closed down substantially into their final arrangement.
  • a forming member 22 can be provided before the inlet die 19.
  • the cable 18 passes over a bar 25 which is caused to move so as to vibrate the cable 18.
  • the bar 25 is pivotally mounted at one end at 26 and at the other end 27 as resiliently supported, as by a spring 28 on a bracket or other rigid support member 29.
  • a vibrator 30 is mounted close to the end 27 of the bar 25.
  • Vibrator 30 can be an electrical, mechanical, or pneumatic vibrator and applies a vertical vibratory movement to the bar 25.
  • the action of the bar is to vibrate the cable 18 and it is believed that this vibratory or shaking movement assists in maintaining the fluidized condition of the powder as it enters the cable between the conductors.
  • the vibratory movement of the cable is not such as will open the conductors to any extent, the cable remaining in a substantially closed condition.
  • Figure 2 illustrates an alternative arrangement in which the bar 25 is moved at its end 27 by a rotary eccentric device 32.
  • the end of the bar can have a slot which engages over a pin eccentricity mounted on a rotating member for example, the axis of rotation normal to the longitudinal axis of the bar.
  • a pin eccentricity mounted on a rotating member for example, the axis of rotation normal to the longitudinal axis of the bar.
  • Various other ways of attaching the end 27 of the bar to an eccentric can be appreciated.
  • Figure 3 illustrates a cantilevered form of apparatus.
  • the bar 25 is rigidly attached at end 27 to a bracket 33 attached to the housing 10 and a vibrator 30, as in Figure 1, is mounted on the bar.
  • the vibrator 30 can be electrical, mechanical or pneumatic in form.
  • the cable is passed through a box-like member 34 at the free end of the bar, although a die or round member can be provided.
  • Figure 4 illustrates a rotary bar 25.
  • the bar is mounted at end 26 in a bearing 35 and at end 27 is attached to a rotary mechanism 36, such as an electric or pneumatic motor.
  • a rotary mechanism 36 such as an electric or pneumatic motor.
  • On the bar 25 are formed one or more of lobes 37 extending axially along the bar. While in Figure 4 the lobes are extending the length of the bar 25, they need only extend for a short distance at the position where the cable passes over the bar. As the bar 25 rotates the lobes vibrate or shake the cable vertically.
  • the form of the bar 25 can vary.
  • the bar will be cylindrical with the lobes extending the length of the bar, or for part of the length.
  • the bar can be narrow or relatively wide. It can have a flat top surface or an arcuate one.
  • the bar is usually of metal, but other materials can be used, and the top surface is usually highly polished to reduce friction and prevent damage.
  • the actual contact surface can be of a material having a low coefficient of friction and also capable of resisting wear.
  • the member 34 could be mounted on the top end of a vertically vibrating member. The desired result is a vibrating or shaking of the cable while it passes through the fluidized powder.
  • the action of vibrating the cable is to assist in maintaining the fluidized medium in a fluidized more uniform distribution of the medium in the cable interstices.
  • a fluidized medium enters a non-vibrating cable, the medium is separated from the fluidizing action of the bed and thus begins to lose the fluid properties, settling out in the cable. This can result in areas of the cable which are not filled properly or are packed with too much powder.
  • vibration of the cable slows down the deterioration of the fluid properties of the fluidized medium, or may maintain or even increase the fluid properties, thus helping the medium to fill all the interstices and reducing the settling out action.
  • the vibratory motion particularly the amplitude, must be such that damage is not caused to the cable.
  • the frequency, and amplitude are such that the cable remains substantially in contact with the vibrating or shaking member.
  • the speed of the cable through the fluidized bed can also be varied, and this can assist in maintaining the cable in contact with the vibrating member.
  • the length of the bed can also be varied.
  • the cable or cable unit can be wrapped with a metal, or other, tape.
  • the cable or unit 18 can be wrapped by tape 38 applied by a former 39, in the example illustrated the former having a tapered inlet portion 39a and parallel rear portion 39b.
  • Figures 6, 7 and 8 illustrate in more detail a specific form of apparatus.
  • the bar is vibrated via a connecting rod mounted on an eccentric.
  • the cable passes through a housing or bush mounted on the bar, the bush being a fairly loose sliding fit on the cable. The cable rests on the lower side or portion of the bushing.
  • FIGs 6, 7 and 8 illustrate in more detail a vibrating bar arrangement in which the bar is vibrated by means of an eccentric driven by an electric motor, for example as in Figure 2.
  • the bar 25 is built up of several portions 25a, 25b, 25c and 25d.
  • Portion 25a is one end portion and is pivotally mounted on a spigot 40 attached to the housing 10. This corresponds to the pivotal mounting position 26 of Figure 2.
  • the spigot is of square cross-section and the end portion 25a has a square bore somewhat larger than the spigot, with spacers 41 either side and positioned on the pivot pin 42.
  • the pivot pin 42 is fixed in the end 25a, as by screws 43, and pivots in a bearing 44 in the spigot 40.
  • Attached to portion 25a is tubular portion 25b. This is conveniently of thin wall circular cross-section tube which is welded to portion 25a.
  • Portion 25c is an open ended box-shaped member attached to portion 25b and to portion 25d, extending between these two portions. Positioned in the box-shaped member or portion 25c is a removable member 45 having a bore 46 therethrough.
  • the bore 46 is a loose fit on the cable, or cable unit, to be filled and different removable members can be provided with different diameter bores 46 to cater for a variety of cable diameters.
  • Portion 25d is to some extent a repetition of the portion 25a. It has a square bore 47 within which extends the end 48 of a pivotted lever 49.
  • the portion 25d is pivotally connected to the end 48 of the lever by a pivot 50, which is fixed in the portion 25d as by screws 51, and pivots in a bearing 52 in the lever 49.
  • Spacers 53 are positioned between the lever 49 and the portion 25d.
  • Lever 49 is pivotally mounted at a position intermediate its ends on a pivot pin 55 mounted in a support 56 attached to a housing 57.
  • the pin 55 is fixed in the lever 49 by a screw 58 and pivots in a bearing 59 in the support 56.
  • At the end 60 of the lever 49 remote from end 48 is a further pivot pin 61.
  • the end 60 of the lever is bifurcated and the lower end of a connecting rod or member 62 is positioned between the bifurcations and pivots on the pin 61.
  • the pin is fixed in the lever as by screws 63 and a bearing 64 is provided in the member 62.
  • the upper end of the connecting rod or member is pivotally mounted on a pin 70 which is eccentrically mounted on the end of a shaft 74 driven by an electric motor 72.
  • a ball bearing 73 is positioned between the connecting member 62 and the pin 70 and the pin 70 is part of a rotating member 74 supported by ball bearings 75 to reduce the loading on the bearings of the motor 72.
  • the ball bearings 75 are carried in a support member 76 attached to the housing 57.
  • the sleeves have flanges 81 which are attached to the housing 57 at one end of the bar and to the housing 10 at the other end of the bar by clamping rings 82 and screws 83. The other ends of the sleeves are clamped to the portions 25a and 25d by clamping rings 84.
  • the amount of eccentricity of the pin 70 and the relative distances between the centres of pins 61 and 50 and the centre of pin 55 will decide the amplitude of the movement at pin 50.
  • the relative distances between the centre of the bore 46 and the centres of the pins 42 and 50 will decide the amplitude of vibration at the bore 46.
  • It is possible to provide for different amplitudes by changing, for example, the member 74. This member is fixed to the shaft 71 of the motor by screw 85 and by release of the screw the member 76 and bearings 74 could be removed from the support member 76, and replaced by another member 74 in which the pin 70 has a different eccentricity.
  • variation in the frequency of vibration can also be provided.
  • Figure 9 illustrates a modification of the arrangement of Figures 6, 7 and 8, in which the bar 25 is actuated directly by the connecting rod or member 62.
  • Figure 9 is very similar to Figure 7, except that only the end portion 25d and part of portion of 25c are shown.
  • End portion 25d has an extension 90 attached thereto, the extension 90 extending into the housing 57 and has a bifurcated end 91, similar to the bifurcated end 60 in Figure 7.
  • the end 91 is connected to the connecting member 62 via pin 61 which is fixed in the end 91 by screws 63 and pivots in a bearing 64 in the connecting member.
  • This pivotal arrangement or connection between the connecting rod or member 62 and the end 91 of the extension 90 is similar to the connection between the connecting rod or member 62 and the end 60 of lever 49 in Figure 7.
  • the extension 90 moves in a slot 92 in the wall of the housing 57.
  • the turn bar in this description has been used in the broad sense in that the bar can have many forms. Thus it can be a flat member with the cable running over it. The upper surface, over which the cable runs, can be convex to reduce the possibility of damage. Alternatively the bar can be a square, round or of other cross-section. Where the bar is rotated, and has lobes or projections, the bar can be solid or tubular. For a vibrating bar again it can be solid or tubular. As illustrated in the particular embodiment, the cable, or cable unit may pass through a bore in the bar. The primary objective is to vibrate or shake the cable or cable unit in a direction substantially normal to its longitudinal axis, thereby facilitating the entry of the filling medium into the interstices between conductors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Communication Cables (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Insulated Conductors (AREA)
  • Jigging Conveyors (AREA)
EP80102883A 1979-06-26 1980-05-23 Powder filling of electric cables, with cable vibrating means Withdrawn EP0021056A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA330612 1979-06-26
CA330,612A CA1110836A (en) 1979-06-26 1979-06-26 Powder filling of electric cables, with cable vibrating means

Publications (1)

Publication Number Publication Date
EP0021056A1 true EP0021056A1 (en) 1981-01-07

Family

ID=4114555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102883A Withdrawn EP0021056A1 (en) 1979-06-26 1980-05-23 Powder filling of electric cables, with cable vibrating means

Country Status (9)

Country Link
EP (1) EP0021056A1 (fi)
JP (1) JPS6047687B2 (fi)
AU (1) AU5829380A (fi)
BR (1) BR8003799A (fi)
CA (1) CA1110836A (fi)
DK (1) DK239380A (fi)
ES (1) ES492790A0 (fi)
FI (1) FI70338C (fi)
NO (1) NO153120C (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113363014A (zh) * 2021-06-11 2021-09-07 上海沪安电缆(无锡)有限公司 一种陶瓷化硅橡胶矿物绝缘防火电缆加粉装置及使用方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183131U (fi) * 1981-05-19 1982-11-20
JPS59212219A (ja) * 1983-05-17 1984-12-01 Purakoo:Kk 廃棄スリツトフイルム再生加工装置
JPS59213455A (ja) * 1983-05-19 1984-12-03 株式会社プラコー 廃棄スリツトフイルム再生加工装置
JPS60230807A (ja) * 1984-05-01 1985-11-16 Toyo Seiki:Kk 樹脂造粒装置の冷却機構

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985097A (en) * 1974-12-31 1976-10-12 Acf Industries, Incorporated Apparatus for coating workpieces with a plastic material
US4123304A (en) * 1976-12-27 1978-10-31 Gaudette Norman O Jelly tube construction and method of waterproofing cable
BE877345A (fr) * 1978-06-28 1979-12-28 Northern Telecom Ltd Remplissage des cables en poudre fluidisee

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985097A (en) * 1974-12-31 1976-10-12 Acf Industries, Incorporated Apparatus for coating workpieces with a plastic material
US4123304A (en) * 1976-12-27 1978-10-31 Gaudette Norman O Jelly tube construction and method of waterproofing cable
BE877345A (fr) * 1978-06-28 1979-12-28 Northern Telecom Ltd Remplissage des cables en poudre fluidisee
NL7904959A (nl) * 1978-06-28 1980-01-03 Northern Telecom Ltd Werkwijze en inrichting voor het vullen van kabels met gefluidiseerd poeder.
DE2925931A1 (de) * 1978-06-28 1980-01-10 Northern Telecom Ltd Verfahren und vorrichtung zur herstellung eines pulvergefuellten kabels
FR2430072A1 (fr) * 1978-06-28 1980-01-25 Northern Telecom Ltd Remplissage des cables en poudre fluidisee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113363014A (zh) * 2021-06-11 2021-09-07 上海沪安电缆(无锡)有限公司 一种陶瓷化硅橡胶矿物绝缘防火电缆加粉装置及使用方法

Also Published As

Publication number Publication date
FI70338C (fi) 1986-09-15
FI801867A (fi) 1980-12-27
JPS5619808A (en) 1981-02-24
BR8003799A (pt) 1981-01-13
CA1110836A (en) 1981-10-20
DK239380A (da) 1980-12-27
NO801799L (no) 1980-12-29
FI70338B (fi) 1986-02-28
JPS6047687B2 (ja) 1985-10-23
NO153120C (no) 1986-01-15
AU5829380A (en) 1981-01-08
ES8103462A1 (es) 1981-02-16
NO153120B (no) 1985-10-07
ES492790A0 (es) 1981-02-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19811204

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GARNER, JOHN NICHOLAS