Nota de aplicación: Codificadores magnéticos de precisión para los entornos más difíciles: los codificadores WDGA personalizados de Wachendorff soportan las duras condiciones de la maquinaria de perforación horizontal de AT-Boretec

Los codificadores rotatorios absolutos resistentes a golpes y vibraciones de Wachendorff Automation proporcionan información de posición precisa para la alimentación automatizada de componentes de tuberías como parte de un sistema de control en las mandrinadoras horizontales de AT-Boretec. Al proporcionar una alternativa rentable a los métodos tradicionales de excavación de zanjas para instalar servicios de banda ancha, suministros de agua y otros sistemas subterráneos, estas máquinas móviles para la industria de la construcción operan en duras condiciones ambientales y mecánicas donde la confiabilidad y una larga vida útil sin problemas son de suma importancia. Representada en el Reino Unido por Variohm EuroSensor,

Los equipos de perforación horizontal autopropulsados ​​de las series Powerdrill y Rockdrill del fabricante alemán AT-Boretec están disponibles en una amplia gama de clases de tonelaje escaladas. Caracterizadas por la fácil carga de herramientas de perforación y escariado y secciones de tuberías para una ejecución rápida de múltiples operaciones de perforación, las máquinas atienden todo, desde tuberías de pequeño diámetro para cables de fibra óptica hasta grandes orificios para sistemas de drenaje de aguas residuales. Especialmente rentables y eficientes en términos de velocidad cuando las tuberías deben ubicarse debajo de carreteras, edificios y otros sitios con superficie sellada, las máquinas pueden perforar hasta varios cientos de metros horizontalmente con un proceso de perforación y lavado que emplea una combinación de cabezales de perforación y escariadores para ampliar el orificio y cuando sea necesario entregar tramos de tubería.

Whereas previous generation machines from AT-Boretec required the operator to leave the cabin and manually unlock each magazine row, thanks to the automation of the magazine unit, the latest Powerdrill series allows the correct row to be conveniently preselected for automatic drill pipe removal via a cabin-mounted touchscreen console – thus saving considerable time and allowing more comfort and safety for the machine operator. As part of the new control system a Wachendorff WDGA absolute encoder is used to provide the row position via its integrated CANopen interface to ensure the gripper makes the exact alignment for the procedure.

The encoder specified for the magazine is a customised version of Wachendorff’s WDGA series, parameterised for an 18 bit multi-turn configuration to provide more than sufficient resolution and measurement range for the task in hand. The selection mechanism is driven via gear reduction with the encoder mounting effectively decoupled via spring-toothed wheel design to minimise unwanted forces on the sensor’s shaft and specially adapted bearing system.

The highly precise, dynamic and robust WDGA series is extremely capable of withstanding the exceptionally shock and vibration levels encountered on the machine where shaft loads of 120 N axially and 220 N radially are easily supported. The WDGA series absolute encoder supplied to AT-Boretec also includes the IP67 environmental protection option as well as additional shaft sealing and, although subjected to extreme weather conditions as well as the mud and dirt deposits due the drilling process, is installed on the machine without the need for additional protection. Two IP67 rated M12 connectors allow easy machine integration for encoder power and CANopen communications. As a standard feature, and for added operational safety as well as fast fault diagnosis, the WDGA includes a status LED integrated in the housing. And of course, absolute positional feedback technology also allows the machine to be set-up without the need for home sensors on start-up or in the event loading problems and subsequent resetting procedures.

The WDGA series, as standard, features Wachendorff’s patented EnDra® and QuattroMag® technologies where a unique non-contacting coded magnetic signal for each individual 4096 counts/rev rotation and for each accumulated revolution does not rely on internal gears or batteries – guaranteeing extremely long life and exceptional levels of reliability over operational temperatures of -40 °C to +85 °C. The standard range covers 36 mm and 58 mm housing diameters with 16/43-bit single-turn/multi-turn resolution and a choice of synchro flange or clamping flange mountings.

The CiA 301 CANopen device profile provides position, speed and acceleration information with many other features such as heartbeat, node-guarding, scaling and extensive diagnostics with up to 4 transmit PDOs individually configurable. Other WDGA series encoders from Wachendorff offer RS485, SAE J1934, SSI, Profibus, ProfiNET, EtherCAT, as well as Universal IE and other interfaces to ensure flexibility across a very wide range of machine architectures. Wachendorff also design and manufacture highly robust incremental encoders and a wide range of application matched measurement systems.

Variohm EuroSensor supplies and fully supports Wachendorff’s complete range of absolute and incremental shaft encoders and measurement components.