Hy­draulics & Pneu­mat­ics

DEMM Engineering & Manufacturing - - FRONT PAGE - www.demm.co.nz/reader- en­quiry #161227

A com­pact safety brake in a small construction space with high forces and all this with­out us­ing hy­draulics – mayr power trans­mis­sion has de­vel­oped a new, high-per­for­mance, pneu­mat­i­cally- re­leased ver­sion of the ROBAguidestop pro­filed rail brake. With this in­no­va­tive brak­ing con­cept, which ful­fils the ever- in­creas­ing safety re­quire­ments and achieves a high-per­for­mance den­sity with­out the use of hy­draulics, the com­pany sets new stan­dards, it claims.

mayr power trans­mis­sion is ex­tend­ing the tried-and-tested ROBA-guidestop se­ries with a pneu­mat­i­cally-re­leased ver­sion, which pro­vides users with new pos­si­bil­i­ties thanks to the high hold­ing forces.

For ma­chines, in which a hy­draulic sys­tem is al­ready avail­able, users can still use the hy­drauli­cally-re­leased ROBA-guidestop safety brakes. How­ever, in ap­pli­ca­tions where a hy­draulics sys­tem would have to be in­stalled first in or­der to op­er­ate a brake with high hold­ing forces or in which sev­eral brakes would be nec­es­sary to achieve the re­quired forces, the pneu­mat­i­cally-re­leased ROBA-guidestop safety brake is now used. It clamps pro­filed rails equally ac­cu­rately and back­lash-free while achiev­ing the same high hold­ing forces as the hy­draulic de­sign of the brake.

IN­NO­VA­TIVE CON­CEPT WITH PRES­SURE BOOSTER

The pneu­matic ROBA-guidestop is opened with com­pressed air at 20 to 30 bar. In or­der to achieve the nec­es­sary op­er­at­ing pres­sure, a com­pact pres­sure booster is used in com­bi­na­tion with the brake, which me­chan­i­cally in­creases the sys­tem pres­sure from 4 to 6 bar as is usual in pneu­matic net­works, with­out the use of ex­ter­nal en­ergy. This in­no­va­tive con­cept en­ables a selective pres­sure in­crease di­rectly prior to the brake, i.e. di­rectly in the sys­tem where the higher pres­sure is re­quired – as a re­sult, short high-pres­sure lines suf­fice. The pneu­matic ROBAguidestop safety brake is avail­able in five construction sizes – each size in both a stan­dard de­sign and in a com­pact, short de­sign – cov­er­ing a range of hold­ing forces from 1 to 34 kN. The brake is de­signed for the dif­fer­ent rail construction sizes of con­ven­tional lin­ear guid­ance man­u­fac­tur­ers.

SAFETY THANKS TO DI­RECT CLAMP­ING

Just like the hy­draulic brake de­sign, the pneu­matic ROBA-guidestop safety brake acts with ex­tremely high rigid­ity di­rectly ap­plied to the lin­ear guid­ance. This means that it is mounted di­rectly on the masses which should be held. This pro­vides a de­ci­sive ad­van­tage, es­pe­cially con­cern­ing grav­ity-loaded axes, where the haz­ard risk for peo­ple should be re­duced: Drive el­e­ments be­tween the motor and the mov­ing mass, such as spin­dles, spin­dle nuts, shaft cou­plings or gear­boxes, there­fore have no in­flu­ence on the safety – as op­posed to the con­cepts us­ing motor brakes, where all drive el­e­ments trans­mit the brak­ing torque to the car­riage. Sys­tems us­ing ROBAguidestop safety brakes there­fore en­able a sig­nif­i­cantly higher rigid­ity than so­lu­tions fea­tur­ing ro­tary brakes in­te­grated into ser­vo­mo­tors.

RE­LI­ABLE AND PRE­CISE

The back­lash-free clamp­ing of the ROBA-guidestop di­rectly onto the pro­file rail pro­vides yet fur­ther ad­van­tages: The ad­di­tional rigid­ity of the NC axis in­creases process ac­cu­racy, im­proves ma­chin­ing per­for­mance and can pro­vide fur­ther tech­no­log­i­cal ad­van­tages for heavy ma­chin­ing, for ex­am­ple. The ma­chin­ing pro­duces less vi­bra­tions and there­fore the sur­face qual­ity of the work­piece is pos­i­tively in­flu­enced. In case of a sta­tion­ary axis, for ex­am­ple dur­ing ma­chin­ing, the brake can ab­sorb the load. As a re­sult, it is pos­si­ble to switch off the drive motor in this phase and re­move it from the con­trols. This elim­i­nates con­trol move­ments and is there­fore gen­tle on the ball screw spin­dle. The closed brake ab­sorbs the ax­ial forces. The ser­vice life and main­te­nance in­ter­vals of the drive com­po­nents are ex­tended.

Like all safety brakes by mayr power trans­mis­sion, the brakes of the ROBA-guidestop se­ries op­er­ate ac­cord­ing to a fail- safe prin­ci­ple, i.e. they are closed in a de- en­er­gised con­di­tion. They re­li­ably guar­an­tee op­er­a­tional and func­tional safety in ma­chines and sys­tems around the globe, states mayr.

With the new pneu­matic ROBAguidestop, mayr power trans­mis­sion pro­vides an in­no­va­tive brak­ing con­cept which ful­fils the high safety re­quire­ments and achieves high per­for­mance den­sity with­out the use of hy­draulics.

In or­der to achieve the nec­es­sary op­er­at­ing pres­sure, a com­pact pres­sure booster is used in com­bi­na­tion with the brake, which in­creases the pres­sure ex­ist­ing in the sys­tem purely me­chan­i­cally and with­out ex­ter­nal en­ergy. This in­no­va­tive con­cept en­ables a selective pres­sure in­crease di­rectly prior to the in­di­vid­ual brake.

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