GB2192168A - Cable hauling machinery - Google Patents
Cable hauling machinery Download PDFInfo
- Publication number
- GB2192168A GB2192168A GB08715386A GB8715386A GB2192168A GB 2192168 A GB2192168 A GB 2192168A GB 08715386 A GB08715386 A GB 08715386A GB 8715386 A GB8715386 A GB 8715386A GB 2192168 A GB2192168 A GB 2192168A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drive wheels
- driven
- sensing
- cable
- rate
- 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
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/30—Devices controlling the forwarding speed to synchronise with supply, treatment, or take-up apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
- B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
- B65H51/08—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements
- B65H51/10—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements with opposed coacting surfaces, e.g. providing nips
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Braking Arrangements (AREA)
Abstract
A control system for use with cable hauling machinery which has a number of driven wheels (2) for displacing an electrical or optical cable or piping by means of frictional engagement comprises a first sensing means (10) for sensing the rate of axial displacement of the cable and a second sensing means (12) for sensing the rate at which the drive wheels are driven by the motors. A comparison means (14) compares the 12 outputs from the first and second sensing means so that any tendency for the drivewheels to be driven at differing rates is sensed, enabling speed regulating means to cause all the drive wheels to be driven at the same speed. <IMAGE>
Description
SPECIFICATION
Cable machinery
This invention relates to linear cable machinery and in particular to a control system therefor.
Theterm "linear cable machinery" asiswell known inthe art, includeswith its scope various types of machinery for laying, relaying or lifting electrical or optical fibre cables or piping.
Typically such machinery may include a number of pneumatic-tyred drive wheels arranged in opposed paired relationship so that the wheels have substantially parallel axes. In operation cable or piping being manoeuvred runs between the wheels of each pairtangentiallyto the wheels, and is engaged on opposite sides bythewheeltyres.The drive wheels of such a device may be arranged on pivot arms and biased by for example, hydraulic cylinders, towards the cable or piping so that the cable or piping is gripped by the tyres.
Furthermore the drive wheels may be driven buy a plurality of hydraulic motors supplied from a common hydraulic source so that the cable or piping is axially displaceable by frictional engagement with the wheels. Advantageously each pivot arm has a hydraulically operable caliper brake for engagement with a disc attached to the hub of the associated wheel.
However, certain difficulties may be encountered in the operation of this type of cable machinery and particularly on starting of the hydraulic motors to effect driving ofthe drive wheels.
Dueto the factthat hydraulic motors are inevitably ofdifferentefficiencies and that the frictional characteristics between the tyre and cable will vary from wheel to wheel, there is a tendency for one of the motors two begin rotating its associated wheel before the other motors with the resultthat slippage will occur between that wheel and the stationary cable. This in turn leads to a decrease in the friction between the wheel and the cable and resulting in the speeding up ofthewheel and motor. Furthermore the resulting instantaneous increase in the hydraulic supply requirement of this motor will have the effect of decreasing the hydraulic supply pressure to the other motors so that the other motors will not start.
Such slippage can cause damage to the cable, optical fibre cables being particularly vulnerable to such damage.
The present invention is concerned with a control system for linear cable machinery which may serve to overcome or at least reduce the above mentioned difficulties in operation.
According to the present invention a control system for use with linear cable machinery of the type comprising a plurality of drive wheels for axially displacing the cable by frictional engagement therewith, and a plurality of motors for driving the drive wheels, wherein the control system comprises first sensing means for sensing the rate of axial displacement of the cable, second sensing means for sensing the rates at which the drive wheels are driven by the motors, comparison means for comparing the outputs from the first and second sensing means so as to sense any tendency for one ofthe drive wheels to be driven at a different rate to the other drive wheels, and speed regulating means for modifying the relative drive rates of the drive wheels in dependence on the result of such comparison so as to cause all the drive wheels to be driven art a uniform rate.
Such a control system is capable of compensating for any differences in the efficiencies of the motors or in the frictional characteristics between the wheels and the cable, with the result that the above-described difficulties associated with slippage of one of the drive wheels may be substantially avoided by use of such a control system.
Although other arrangements are possible, the firstsensing means may comprise a cable-engaging measuring wheel which is not driven by a motor, and a sensor, preferably an electronic sensor, for sensing the rate at which the measuring wheel is rotated by engagement with the cable.
Similarly the second sensing means may comprise a respective sensor associated with each drive wheel for sensing the rate at which the associated drive wheel is driven by its motor.
In a preferred embodiment ofthe invention, for use with cable machinery having braking means associated with each drive wheel, the speed regulating means is adapted to operate the brake means sothatone or more ofthe drivewheels may have a braking force applied thereto to cause all the drive wheels to be driven art a uniform rate.
Advantageously braking, is applied to a drive wheel only momentarily, but brake applications are repeated until such time as the wheel is moving steadily atthe required speed. In this manner it is possible to ensure a smooth start-up of all wheels.
In an alternative embodiment of the invention,for use with cable machinery in which each of the motors is a hydraulic motor supplied by a hydraulic line, the speed regulating means includes a control valve located in the hydraulic supply line of each motor, and actuating means for operating the control valve in one or more ofthe hydraulic lines of the motors so asto cause all the drive wheels to be driven art a uniform rate.
It should be understood that the invention includes within its scope a control system forfitting to existing linearcable machinery, as well as linear cable machinery in which such a control system has been installed during manufacture.
In orderthatthe invention may be more fully understood, two alternative embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure lisa schematic diagram of a first control system in accordance with the invention; and
Figure 2 is a schematic diagram of a second control system in accordance with the invention.
Referring to Figure 1,thelinearcablemachinery includes a number of pneumatic-tyred drive wheels 2 arranged opposite one another in pairs with the cable 4 being engaged on opposite sides by the wheel tyres. Although not specifically shown in the figure, each wheel 2 is arranged on a respective pivot arm biased by a hydraulic cylinder towards the cable 4 and is driven by a respective hydraulic motor.
Associated with each wheel 2 is a hydraulically operated caliper brake 6 (only one ofwhich is shown in order to render the figure easierto read) which clamps onto a disc 8 attached to the wheel hub.
Asensor 10comprises acable-engaging measuring wheel and a synchro for outputting a cable speed data signal dependent on the rate at which the measuring wheel is rotated by engagement with the cable 4. Furthermore, a respectivesynchro 12 is associated with each drive wheel 2 for outputting a wheel speed data signal dependent on the rate at which the wheel 2 is driven by its associated motor.
The cable speed and wheel speed data signals are supplied to respective inputs of processing control circuitry 14which compares the wheel speed data signal from each drive wheel 2 with the cable speed data signal, and outputs a pulsed error signal in dependence on the result of such comparison.
If any individual wheel 2 is shown by such comparison to be moving faster than the measuring wheel, an error signal is supplied to a respective solenoid-operated control valve 16 in the hydraulic supply line 18 to the brake 6 associated with the appropriate drive wheel 2. This in turn operates a pressure control valve 20 which sets up a pulsed hydraulic fluid signal in the supply line to the brake 6 resulting in repeated application ofthe brake 6 until such time as the drive wheel 2 is moving steadily at the same speed as the measuring wheel.
In Figure 2, which shows an alternative embodiment ofthe invention, like parts are denoted bythe same reference numerals as in Figure 1.
However, in Figure 2, the brake associated with each drive wheel 2 is not shown, but instead there is shown a hydraul ic motor 22 for driving one of the drive wheels 2 (the motors associated with the other wheels 2 not being shown in order to renderthe figureeasierto read).
As in the embodiment of Figure 1, each wheel speed data signal is compared to the cable speed data signal in the processing control circuitry 14, and, if one of the drive wheels 2 is detected as moving faster than the measuring wheel, a pulsed error signal is sent to a respective solenoid-operated hydraulic motor bypass valve 24 in the hydraulic supply line 26 to the motor 22 driving the appropriate drive wheel 2.
The bypass valve 24 is supplied by a hydraulic supply line 28. The hydraulic supply to the motor 22 is controlled by the bypass valve 24 until such time as the associated drive wheel 2 is moving steadily at the same speed as the measuring wheel.
Claims (7)
1. Acontrolsystemforusewith linearcable machinery ofshetype comprising a plurality of drive wheels for axially displacing the cable by frictional engagement therewith, and a plurality of motors for driving the drive wheels, wherein the control system comprises first sensing means for sensing the rate of axial displacement ofthe cable, second sensing means for sensing the rates at which the drive wheels are driven by the motors, comparison means for comparing the outputs from the first and second sensing means so as to sense any tendency for one of the drive wheels to be driven at a different rate to the other drive wheels, and speed regulating means for modifying the relative drive rates of the drive wheels in dependence on the result of such comparison so as to cause all the drive wheels to be driven at a uniform rate.
2. A control system as claimed in claim 1, in which the first sensing means may comprise a cable-engaging measuring wheel which is not driven by a motor, and a sensor for sensing the rate at which the measuring wheel is rotated byengagementwith the cable.
3. Acontrol system as claimed in claim 1 orclaim 2, wherein the second sensing means comprises a respective sensor associated with each drive wheel for sensing the rate at which the associated drive wheel is driven by its motor.
4. A control system as claimed in any one of claims 1 to3forusewithcable machinerywhich has a braking means associated with each drive wheel, the speed regulating means is adapted to operate the brake means so that on or more of the drive wheels may have a braking force applied thereto to cause all the drive wheels to be driven at a uniform rate.
5. Acontrol system as claimed in any one of claims 1 to 3for usewith cabie machineryin which each ofthe motors is a hydraulic motor supplied bya hydraulic line, the speed regulating means includes a control valve located in the hydraulic supply line of each motor and actuating means for operating the control valve in one or more ofthe hydraulic lines of the motors so as to cause all the drivewheelsto be driven ata uniform rate.
6. A control system substantially as hereinbefore described with reference to Figure 1 ofthedrawing.
7. A control system substantially as hereinbefore described with reference to Figure 2 of the drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868616053A GB8616053D0 (en) | 1986-07-01 | 1986-07-01 | Linear cable machinery |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8715386D0 GB8715386D0 (en) | 1987-08-05 |
| GB2192168A true GB2192168A (en) | 1988-01-06 |
| GB2192168B GB2192168B (en) | 1989-12-13 |
Family
ID=10600375
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868616053A Pending GB8616053D0 (en) | 1986-07-01 | 1986-07-01 | Linear cable machinery |
| GB8715386A Expired GB2192168B (en) | 1986-07-01 | 1987-07-01 | Cable machinery |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868616053A Pending GB8616053D0 (en) | 1986-07-01 | 1986-07-01 | Linear cable machinery |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8616053D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0328748A2 (en) * | 1988-02-16 | 1989-08-23 | kabelmetal electro GmbH | Method and device to splay out the optical conductors of a fibre bundle |
| GB2259493A (en) * | 1991-09-13 | 1993-03-17 | Hitachi Cable | Cable drawing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676388B (en) * | 2016-04-14 | 2018-10-12 | 杭州富通通信技术股份有限公司 | Fiber optic cable manufacture method |
-
1986
- 1986-07-01 GB GB868616053A patent/GB8616053D0/en active Pending
-
1987
- 1987-07-01 GB GB8715386A patent/GB2192168B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0328748A2 (en) * | 1988-02-16 | 1989-08-23 | kabelmetal electro GmbH | Method and device to splay out the optical conductors of a fibre bundle |
| EP0328748A3 (en) * | 1988-02-16 | 1990-05-09 | kabelmetal electro GmbH | Method and device to splay out the optical conductors of a fibre bundle |
| GB2259493A (en) * | 1991-09-13 | 1993-03-17 | Hitachi Cable | Cable drawing |
| US5390841A (en) * | 1991-09-13 | 1995-02-21 | Nippon Sheet Glass Co., Ltd. | Method of drawing large-size elongate cable for installation |
| GB2259493B (en) * | 1991-09-13 | 1995-09-06 | Hitachi Cable | Method and apparatus for drawing an elongate cable along a cable laying route |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8715386D0 (en) | 1987-08-05 |
| GB8616053D0 (en) | 1986-08-06 |
| GB2192168B (en) | 1989-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920701 |