Kendrion Worldwide

Division Automotive

Kendrion Holding

Kendrion N.V. is a public limited liability company incorporated under the laws of the Netherlands, with its registered office in Zeist.

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EEX Line

Freni monodisco in esecuzione anti-deflagrante

Nei freni a pressione di molle con protezione antideflagrante tutti i componenti che potrebbero causare l'innesco di sostanze esplosive sono racchiusi in uno speciale alloggiamento.

EEX Line

La serie EEX LINE comprende freni monodisco a molle in esecuzione antideflagrante per ambienti a rischio di esplosione. Il freno a pressione di molle con protezione contro le esplosioni trova particolare impiego nel settore degli scavi sotterranei dove sussiste il rischio di esplosione del grisù. Nei freni a pressione di molle con protezione antideflagrante tutti i componenti che potrebbero causare l'innesco di miscele esplosive sono racchiusi in uno speciale involucro. Nel caso si verifichi un'esplosione all'interno dell'involucro, l'elevata resistenza alle pressioni dello stesso impedisce che l'esplosione venga trasmessa alle miscele all'esterno. Il freno é provvisto di quattro interruttori termici di protezione e di un microinterruttore. Il microinterruttore previene l'avvio prima che il freno venga rilasciato. Gli interruttori termici sono collegati in serie con il microinterruttore e interrompono il circuito di comando della macchina in caso di temperature troppo elevate in corrispondenza del freno. Il freno é resistente all'acqua di mare. Nei freni elettromagnetici a pressione di molle la coppia frenante viene generata al disinserimento della corrente. Il freno è dotato di leva di sblocco che permette di disattivare l'effetto frenante manualmente.

Specifiche & Dati tecnici

Coppie nominali10 Nm - 270 Nm
Tensione205, 230 V CC
Classe di protezioneIP 67

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Operating principle

The spring-applied single-disc brake is designed to operate dry. The force generated by an electromagnetic field is utilised to overcome the braking effect produced by the spring force. The spring-applied single-disc brake engages in unpowered condition and releases when DC voltage is applied. The form-fit connection between the friction disc and hub and the connection of the hub with the machine shaft (e.g. motor shaft) ensure that the torque generated by the spring-applied single-disc brake (brake torque) is reliably transmitted to the machine (motor). Explosion-protected spring-applied single-disc brakes are characterised by the fact that all components that may ignite explosive mixtures are placed in an enclosure. This enclosure is designed to withstand the specified test pressure in case the mixture explodes inside the enclosure. It also ensures that mixtures outside the enclosure are not affected by the explosion.

Brake design

The solenoid housing of the spring-applied single-disc brake accommodates the firmly fitted field coil with flying leads. The flying leads are connected to the connecting terminal inside the connector box. The flange and friction plate are screwed to the solenoid housing by means of machine screws. The cover is fixed to the solenoid housing by means of machine screws to obtain a pressure-sealed assembly. Owing to the spring force generated by the compression springs, the friction disc is pressed over the armature against the friction plate and flange to generate the braking effect of the spring-applied brake. The friction disc and hub, which constitute the rotating part of the spring-applied brake, are connected with the shaft to be braked. The friction disc features a square socket and can be moved on the hub in axial direction. Spacer sleeves are provided to allow the air gap 's' to be adjusted. The customer-specific connecting cable can be fed into the connector box through a cable gland. When DC voltage is applied to the built-in field coil of the spring-applied single-disc brake, the spring force is overcome by the dynamic effect of the electromagnetic field. This causes the armature to be released and the braking effect to be neutralised. The shaft to be braked is not exposed to any axial force by the brake. The spring-applied single-disc brake is equipped with a redundant thermoswitch system and with a microswitch. The microswitch is provided to prevent machine (e.g. motor) start-up before the brake has been released. The four thermoswitches are connected in series with the microswitch and interrupt the control circuit of the machine (e.g. motor) as soon as the maximum permitted brake temperature is exceeded. When using brakes with hand release, openings must be provided in the part enclosing the brake (e.g. fan cover) to allow the hand release lever to be installed. The hand release allows the brake to be released manually (e.g. in case of power failure).