US3770108A - Tensioning device for wide moving belts - Google Patents

Tensioning device for wide moving belts Download PDF

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Publication number
US3770108A
US3770108A US00236690A US3770108DA US3770108A US 3770108 A US3770108 A US 3770108A US 00236690 A US00236690 A US 00236690A US 3770108D A US3770108D A US 3770108DA US 3770108 A US3770108 A US 3770108A
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tensioning
cylinders
hydraulic
conduit
belt
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US00236690A
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H Ettel
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Mende Wilhelm and Co
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Mende Wilhelm and Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
    • B21C47/3408—Feeding or guiding devices not specially adapted to a particular type of apparatus for monitoring the lateral position of the material
    • B21C47/3425—Feeding or guiding devices not specially adapted to a particular type of apparatus for monitoring the lateral position of the material without lateral edge contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus

Definitions

  • the device comprises hydraulic cylinders, one at either end of the drum axle to adjust tension by moving the drum, and a regulating cylinder acting on the axle in a direction perpendicular to the force of the tensioning cylinders which responds to lateral deflections of the belt and tilts the drum to cause the belt to return to its normal mean position.
  • the tensioning cylinders are connected to a common fluid supply conduit oflarger diameter than the conduit connecting to the source of fluid to insure equal pres sure in both cylinders in any tilted position.
  • This invention relates to a tensioning device for wide strip which passes over a tensioning roll whose axle is prestressed on each side by a hydraulic tensioning cylinder in the direction of tension of the strip, the tensioning cylinders being connected by means of supply conduits to a source of pressure medium where furthermore in addition to the hydraulic tensioning cylinder there is provided on one side of the roll a hydraulic regulating cylinder acting on the axle in a substantially perpendicular direction to the direction of force of the hydraulic tensioning cylinder and which is supplied with a pressure medium as a function of the lateral deflections of the strip in such a manner that tilting of the roll causes the strip to be returned into its mean position.
  • a tensioning device for steel strip in which hydraulic tensioning cylinders press against the ends of the shaft of the tensioning roll and thus prestress the latter in the direction of tension.
  • the axis of the tensioning roll is subjected at one end to an additional load from a regulating cylinder whose direction of force is perpendicular to that of the adjacent tensioning cylinder.
  • the regulating cylinder is supplied with a pressure medium as a function of the deflections of the steel strip.
  • the deflections are detected by a sensing device which is irrelevant in this context, and converted into corresponding pressure signals which act on the regulating cylinder. It has been found in The object of the present invention is to provide a device for tensioning a strip whereby cracking of the strip, more especially of a steel strip, is prevented.
  • the problem of the present invention is solved by joining the two hydraulic tensioning cylinders by means of an equalising conduit.
  • the solution according to the present invention is based on the fact that the regulating movements of the regulating cylinder may be very great, especially if the strip should be deflected rapidly as may be caused, for example, by a sudden cold draught of air. Since the regulating of the central path of the steel strip is basically effected by the tilting of the tensioning roll, great stresses are produced in the peripheral zone of the steel strip. During the regulating process this peripheral zone must absorb, in practice, the entire stresses of the strip which during normal running would be absorbed by the total width of the steel strip. Thus cracks are formed which may then easily be propagated due to the notch effect over the entire width of the strip.
  • the teaching of the present invention is directed in such a way as to ensure a very uniform stress load over the entire width of the strip even under a regulating movement.
  • a direct connecting conduit is provided between the hydraulic tensioning cylinders which permits a very rapid equalisation of the pressure medium so that both ends of the tensioning cylinders and thus the strip must always be uniformly stressed over its entire width.
  • each tensioning cylinder it is not necessary to provide each tensioning cylinder with its own supply conduit from a source of pressure medium.
  • One conduit for the pressure medium suffices and it may be very thin, even thinner that the equalising conduit between the tensioning cylinders, thus considerably simplifying the apparatus.
  • the rate of equalisation of the pressure medium in the equalising conduit and thus the accelerations are slow so that the regulating movements of the regulating cylinders will cause a rapid equalisation by the tensioning cylinders of the changes in the stress of the strip over its entire width.
  • FIG. 1 is a right side view of a preferred embodiment of the present invention.
  • FIG. 2 is a cross-section of the preferred embodiment of the present invention shown in FIG. 1 taken along 11-.
  • a steel strip 1 is passed over a pair of deflecting rolls 2, 3 and a tensioning roll 4.
  • the tensioning roll 4 includes a shaft or axis 5.
  • the tensioning cylinders 7 are connected by means of a pressure equalizing conduit 8.
  • the pressure equalizing conduit 8 is connected by a supply conduit 9 to a pressure source (not shown) which supplies the pressure necessary to operate the tensioning cylinders 7.
  • the diameter of the pressure equalizing conduit 8 is large compared to the diameter of the supply conduit 9 to ensure that there is always equal pressure in the tensioning cylinders 7.
  • a regulating cylinder 10 having a plunger 11, acts upon one end of the shaft 5.
  • the regulating cylinder 10 acts in a direction substantially'perpendicular to the direction of action of tensioning cylinders 7.
  • a regulating conduit 12 connects the regulating cylinder 10 with a variable pressure source (not shown).
  • the pressurization of the regulating cylinder 10 varies according to the deflection of the steel strip 1 from its central path. This deflection is measured by any conventional detecting means. In this manner, the tensioning roll 4 is tilted as a function of the path of the steel strip 1, such that the steel strip 1 is returned to its central path.
  • a tensioning device for conveyor belts, said tensioning device including a tensioning roll, said conveyor belt passing over and having a mean path on said tensioning roll, a pair of hydraulic cylinders, said tensioning cylinders being connected to a pressure source by a supply conduit and acting upon said tensioning roll to adjust the tension exerted by said tensioning roll upon said conveyor belt, and a hydraulic regulating cylinder, said hydraulic regulating cylinder acting upon one end of said tensioning roll in a direction substantially perpendicular to the direction of action of said hydraulic tensioning cylinders, said hydraulic regulating cylinder being connected to a pressure source and pressurized as a function of the lateral deflection of tween said hydraulic tensioning cylinders.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Drives For Endless Conveyors (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Abstract

A tensioning device for a steel conveyor belt running over a drum or pulley which insures uniform tension over the entire width of the belt to prevent cracking the belt due to concentrated stress. The device comprises hydraulic cylinders, one at either end of the drum axle to adjust tension by moving the drum, and a regulating cylinder acting on the axle in a direction perpendicular to the force of the tensioning cylinders which responds to lateral deflections of the belt and tilts the drum to cause the belt to return to its normal mean position. The tensioning cylinders are connected to a common fluid supply conduit of larger diameter than the conduit connecting to the source of fluid to insure equal pressure in both cylinders in any tilted position.

Description

United States Patent [111 aye/awe Ettel Nov. 6, 1973 TENSIONING DEVICE FOR WIDE MOVING BELTS Primary Examiner-Edward A. Sroka [75] Inventor: Hubert Ettel, Teichhutte/Harz, Atmmey GeOrge Newm et Germany [73] Assignee: Wilhelm Mende & C0., [57] ABSTRACT Teichhutte/Harz, Germany A tensioning device for a steel conveyor belt running [22] Filed: Mar. 21, 1972 App]. No.: 236,690
FOREIGN PATENTS OR APPLICATIONS 9/1967 Germany 226/21 over a drum or pulley which insures uniform tension over the entire width of the belt to prevent cracking the belt due to concentrated stress. The device comprises hydraulic cylinders, one at either end of the drum axle to adjust tension by moving the drum, and a regulating cylinder acting on the axle in a direction perpendicular to the force of the tensioning cylinders which responds to lateral deflections of the belt and tilts the drum to cause the belt to return to its normal mean position. The tensioning cylinders are connected to a common fluid supply conduit oflarger diameter than the conduit connecting to the source of fluid to insure equal pres sure in both cylinders in any tilted position.
3 Claims, 2 Drawing Figures 1 TENSIONING DEVICE FOR WIDE MOVING BELTS This invention relates to a tensioning device for wide strip which passes over a tensioning roll whose axle is prestressed on each side by a hydraulic tensioning cylinder in the direction of tension of the strip, the tensioning cylinders being connected by means of supply conduits to a source of pressure medium where furthermore in addition to the hydraulic tensioning cylinder there is provided on one side of the roll a hydraulic regulating cylinder acting on the axle in a substantially perpendicular direction to the direction of force of the hydraulic tensioning cylinder and which is supplied with a pressure medium as a function of the lateral deflections of the strip in such a manner that tilting of the roll causes the strip to be returned into its mean position.
A tensioning device for steel strip is known in which hydraulic tensioning cylinders press against the ends of the shaft of the tensioning roll and thus prestress the latter in the direction of tension. In order to compensate for any lateral deflection of the steel strip the axis of the tensioning roll is subjected at one end to an additional load from a regulating cylinder whose direction of force is perpendicular to that of the adjacent tensioning cylinder. The regulating cylinder is supplied with a pressure medium as a function of the deflections of the steel strip. The deflections are detected by a sensing device which is irrelevant in this context, and converted into corresponding pressure signals which act on the regulating cylinder. It has been found in The object of the present invention is to provide a device for tensioning a strip whereby cracking of the strip, more especially of a steel strip, is prevented.
The problem of the present invention is solved by joining the two hydraulic tensioning cylinders by means of an equalising conduit.
The solution according to the present invention is based on the fact that the regulating movements of the regulating cylinder may be very great, especially if the strip should be deflected rapidly as may be caused, for example, by a sudden cold draught of air. Since the regulating of the central path of the steel strip is basically effected by the tilting of the tensioning roll, great stresses are produced in the peripheral zone of the steel strip. During the regulating process this peripheral zone must absorb, in practice, the entire stresses of the strip which during normal running would be absorbed by the total width of the steel strip. Thus cracks are formed which may then easily be propagated due to the notch effect over the entire width of the strip.
The teaching of the present invention is directed in such a way as to ensure a very uniform stress load over the entire width of the strip even under a regulating movement. For this purpose a direct connecting conduit is provided between the hydraulic tensioning cylinders which permits a very rapid equalisation of the pressure medium so that both ends of the tensioning cylinders and thus the strip must always be uniformly stressed over its entire width.
In the solution according to the present invention it is not necessary to provide each tensioning cylinder with its own supply conduit from a source of pressure medium. One conduit for the pressure medium suffices and it may be very thin, even thinner that the equalising conduit between the tensioning cylinders, thus considerably simplifying the apparatus.
If the equalising conduit is considerably larger than the supply conduit the rate of equalisation of the pressure medium in the equalising conduit and thus the accelerations, are slow so that the regulating movements of the regulating cylinders will cause a rapid equalisation by the tensioning cylinders of the changes in the stress of the strip over its entire width.
Although in practice it is most convenient to usehydraulic tensioning cylinders, it may also be suitable to use the corresponding mechanical equivalent in the form of a balance beam whose ends support the ends of the shaft of a tensioning roll and whose centre is supported.
The invention will be illustrated in more detail by an embodiment as shown in the drawings where FIG. 1 is a right side view of a preferred embodiment of the present invention.
FIG. 2 is a cross-section of the preferred embodiment of the present invention shown in FIG. 1 taken along 11-.
Referring to FIGS. 1 and 2, a steel strip 1 is passed over a pair of deflecting rolls 2, 3 and a tensioning roll 4. The tensioning roll 4 includes a shaft or axis 5.
A pair of tensioning cylinders 7, having plungers 6, act upon the ends of the shaft 5. As indicated eariler, the tensioning cylinders 7 prestress the steel strip 1 to the desired tension.
The tensioning cylinders 7 are connected by means ofa pressure equalizing conduit 8. The pressure equalizing conduit 8 is connected by a supply conduit 9 to a pressure source (not shown) which supplies the pressure necessary to operate the tensioning cylinders 7. The diameter of the pressure equalizing conduit 8 is large compared to the diameter of the supply conduit 9 to ensure that there is always equal pressure in the tensioning cylinders 7.
Additionally, a regulating cylinder 10, having a plunger 11, acts upon one end of the shaft 5. The regulating cylinder 10 acts in a direction substantially'perpendicular to the direction of action of tensioning cylinders 7. A regulating conduit 12 connects the regulating cylinder 10 with a variable pressure source (not shown).
The pressurization of the regulating cylinder 10 varies according to the deflection of the steel strip 1 from its central path. This deflection is measured by any conventional detecting means. In this manner, the tensioning roll 4 is tilted as a function of the path of the steel strip 1, such that the steel strip 1 is returned to its central path.
The tilting of the tensioning roll 4, however, also changes the stress pattern exerted by the tensioning roll 4 on the steel strip 1, and the new stress pattern may cause cracking in the peripheral zones of the steel strip 1. According to the present invention, this cracking problem is substantially avoided by means of pressure equalizing conduit 8, which ensures that fundamentally the same pressure prevails in both tensioning cylinders 7. Thus, regardless of the orientation of the tensioning roll 4, the steel strip 1 is subjected to the same stress over its entire length.
I claim:
l. in a tensioning device for conveyor belts, said tensioning device including a tensioning roll, said conveyor belt passing over and having a mean path on said tensioning roll, a pair of hydraulic cylinders, said tensioning cylinders being connected to a pressure source by a supply conduit and acting upon said tensioning roll to adjust the tension exerted by said tensioning roll upon said conveyor belt, and a hydraulic regulating cylinder, said hydraulic regulating cylinder acting upon one end of said tensioning roll in a direction substantially perpendicular to the direction of action of said hydraulic tensioning cylinders, said hydraulic regulating cylinder being connected to a pressure source and pressurized as a function of the lateral deflection of tween said hydraulic tensioning cylinders.

Claims (3)

1. In a tensioning device for conveyor belts, said tensioning device including a tensioning roll, said conveyor belt passing over and having a mean path on said tensioning roll, a pair of hydraulic cylinders, said tensioning cylinders being connected to a pressure source by a supply conduit and acting upon said tensioning roll to adjust the tension exerted by said tensioning roll upon said conveyor belt, and a hydraulic regulating cylinder, said hydraulic regulating cylinder acting upon one end of said tensioning roll in a direction substantially perpendicular to the direction of action of said hydraulic tensioning cylinders, said hydraulic regulating cylinder being connected to a pressure source and pressurized as a function of the lateral deflection of said conveyor belt from said mean position, such that said tensioning roll is tilted causing said conveyor belt to return to said mean position, the improvement comprising an equalizing conduit connecting said hydraulic tensioning cylinders, said equalizing conduit equalizing the pressure in said hydraulic tensioning cylinders to provide a uniform tension across said conveyor belt.
2. The improvement of claim 1 wherein the diameter of said equalizing conduit is substantially greater than the diameter of said supply conduit.
3. The improvement of claim 1 wherein said supply conduit is connected to said equalizing conduit between said hydraulic tensioning cylinders.
US00236690A 1971-03-26 1972-03-21 Tensioning device for wide moving belts Expired - Lifetime US3770108A (en)

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Application Number Priority Date Filing Date Title
DE2114835A DE2114835C3 (en) 1971-03-26 1971-03-26 Device for tensioning a wide band

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US3770108A true US3770108A (en) 1973-11-06

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US (1) US3770108A (en)
JP (1) JPS5131791B1 (en)
AT (1) AT315112B (en)
BE (1) BE781104A (en)
BR (1) BR7201761D0 (en)
CA (1) CA933964A (en)
CH (1) CH531983A (en)
CS (1) CS160694B2 (en)
DD (1) DD96207A5 (en)
DE (1) DE2114835C3 (en)
DK (1) DK137375C (en)
ES (1) ES400997A1 (en)
FR (1) FR2131383A5 (en)
GB (1) GB1389722A (en)
IT (1) IT950697B (en)
NL (1) NL7203794A (en)
SU (1) SU602109A3 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173904A (en) * 1975-09-03 1979-11-13 S.P.A. Luigi Rizzi & C. Apparatus for automatically centering an endless band trained over two rolls
US4421228A (en) * 1981-08-17 1983-12-20 Eastman Kodak Company Periodically aligning an endless web
CN101906732A (en) * 2010-07-20 2010-12-08 山东中力机械制造有限公司 Integrated corrector signal valve
CN102991964A (en) * 2012-10-14 2013-03-27 昆山特力伯传动科技有限公司 Conveyor with tension regulating roller
CN103964134A (en) * 2014-05-22 2014-08-06 成都海凌达机械有限公司 Regulating mechanism for stably regulating tension of carrier roller belt
CN103979268A (en) * 2014-05-22 2014-08-13 成都海凌达机械有限公司 Belt slack adjuster
CN104692273A (en) * 2014-12-26 2015-06-10 华南农业大学 Tension adjusting device and method for steel wire ropes of bidirectional traction type rail transport machine
CN105621027A (en) * 2016-03-18 2016-06-01 叶侃 Ceramic cutting and conveying device
US10301117B2 (en) * 2015-11-12 2019-05-28 Rotzinger Ag Conveyer belt
CN117383325A (en) * 2023-12-12 2024-01-12 江苏上达半导体有限公司 Deviation correcting device that flexible substrate rolling was used

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3726605A1 (en) * 1987-08-10 1989-02-23 Rexroth Mannesmann Gmbh ARRANGEMENT FOR CONTROLLING THE STROKE OF TWO LIFT CYLINDERS
DE9215165U1 (en) * 1992-11-06 1993-10-21 Visual Communications Ingenieurberatungs GmbH, 81243 München Chain drive
DE4321230A1 (en) * 1993-06-25 1995-03-02 Siemens Ag Device for the metrological registration of the strip tension in strip rolling mills
CN109110538A (en) * 2018-09-14 2019-01-01 四川环图材料科技有限公司 A kind of waterproof roll wrap-up
CN110294351A (en) * 2019-06-17 2019-10-01 Oppo（重庆）智能科技有限公司 Label pastes cutting equipment
CN114955400A (en) * 2022-06-07 2022-08-30 湖北中烟工业有限责任公司 A kind of pneumatic tensioning device for conveyor belt of ZB45 packaging machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250228B (en) * 1964-07-03 1967-09-14 Continental Elektro Ind Ag Hydraulically acting device for regulating the position of a moving belt

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250228B (en) * 1964-07-03 1967-09-14 Continental Elektro Ind Ag Hydraulically acting device for regulating the position of a moving belt

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173904A (en) * 1975-09-03 1979-11-13 S.P.A. Luigi Rizzi & C. Apparatus for automatically centering an endless band trained over two rolls
US4421228A (en) * 1981-08-17 1983-12-20 Eastman Kodak Company Periodically aligning an endless web
CN101906732A (en) * 2010-07-20 2010-12-08 山东中力机械制造有限公司 Integrated corrector signal valve
CN101906732B (en) * 2010-07-20 2012-09-26 山东中力机械制造有限公司 Integrated corrector signal valve
CN102991964A (en) * 2012-10-14 2013-03-27 昆山特力伯传动科技有限公司 Conveyor with tension regulating roller
CN103979268A (en) * 2014-05-22 2014-08-13 成都海凌达机械有限公司 Belt slack adjuster
CN103964134A (en) * 2014-05-22 2014-08-06 成都海凌达机械有限公司 Regulating mechanism for stably regulating tension of carrier roller belt
CN104692273A (en) * 2014-12-26 2015-06-10 华南农业大学 Tension adjusting device and method for steel wire ropes of bidirectional traction type rail transport machine
US10301117B2 (en) * 2015-11-12 2019-05-28 Rotzinger Ag Conveyer belt
CN105621027A (en) * 2016-03-18 2016-06-01 叶侃 Ceramic cutting and conveying device
CN105621027B (en) * 2016-03-18 2018-08-14 广东金巴利陶瓷有限公司 A kind of ceramics cutting conveying appliance
CN117383325A (en) * 2023-12-12 2024-01-12 江苏上达半导体有限公司 Deviation correcting device that flexible substrate rolling was used
CN117383325B (en) * 2023-12-12 2024-03-22 江苏上达半导体有限公司 Deviation correcting device that flexible substrate rolling was used

Also Published As

Publication number Publication date
FR2131383A5 (en) 1972-11-10
SU602109A3 (en) 1978-04-05
BR7201761D0 (en) 1973-04-26
AT315112B (en) 1974-05-10
DK137375C (en) 1978-08-07
GB1389722A (en) 1975-04-09
BE781104A (en) 1972-07-17
CS160694B2 (en) 1975-03-28
JPS5131791B1 (en) 1976-09-08
CA933964A (en) 1973-09-18
DD96207A5 (en) 1973-03-12
CH531983A (en) 1972-12-31
DK137375B (en) 1978-02-27
NL7203794A (en) 1972-09-28
DE2114835C3 (en) 1975-10-09
DE2114835B2 (en) 1975-02-27
IT950697B (en) 1973-06-20
DE2114835A1 (en) 1972-10-05
ES400997A1 (en) 1975-02-01

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