QTZ160(6018) Tower Crane

【Hoisting Mechanism】:

【Rotary Mechanism】:

  The slewing mechanism is the transmission device that provides power for the upper slewing of the tower crane. This device consists of a torque motor with a brake at the rear, a planetary gear reducer, a pinion gear, and a slewing limiter. This tower crane employs two such devices, symmetrically distributed on both sides of the slewing bearing and mounted on the upper support. Their pinion gears mesh with the large ring gear of the slewing bearing.

  The input end of the reducer is equipped with a normally open disc brake; it can be used for tower crane jacking operations and for braking and positioning the boom during fixed-point operations.

  The slewing limiter is used to restrict the tower crane's rotation to 540° in a single direction, preventing cable breakage.

【Variable-amplitude mechanism】:

【Standard Tower Section】:

  Close-up of the main limb

   The standard sections of the tower body feature an integral frame structure, with each section securely connected by 12-M36 special high-strength bolts. Base frame sections are joined using 16-M36 high-strength bolts. A rest platform is provided every three sections, and standard sections of the same specification are interchangeable.

【Rotary Limit Switch】:

【Tower Top】

   The tower top is a truncated cone. Its upper end connects to the boom and counterweight arm via tie rods, maintaining the horizontal alignment of both arms. Its lower end connects to the rotating tower body via four pins. To facilitate the installation of the boom tie rod and counterweight arm tie rod, a work platform and pulley system are installed at the upper section of the tower top.

【Driver's Cab】

   The cab serves as the operator's workstation for controlling the tower crane, fixed to the right side of the rotating tower body. The indicator lights and control handles of the integrated control console are positioned on both sides of the operator's seat, offering convenient operation and a wide field of view.

   The cab electrical control box is located at the rear of the cab, housing the main circuit breaker, lighting circuit breakers, auxiliary circuit breakers, and other devices.

【Load Limiters】:

【Walking Device】:

   The traveling mechanism features two powered trolleys, each comprising an electric motor, hydraulic coupling, worm gear reducer, disc brake, open gear rim, and travel wheels. The hydraulic coupling ensures smooth starting and braking of the tower crane, with a travel speed of 20 meters per minute.

    The YZ160M2-6-2 7.5KW AC motor controls the operation of the mechanism via the master controller. The normally closed disc brake at the tail end of the worm shaft releases during operation and applies delayed braking after shutdown and power disconnection. The delay time is adjustable to ensure a short stopping distance and prevent tower crane sway caused by abrupt braking.

    Two limit switches are installed on the outer side of the active trolley to prevent the tower crane from traveling beyond its preset limit positions, ensuring operational safety.

【Electrical Control System and Safety Devices】:

   This system employs a programmable logic controller for centralized control. The electrical control system adopts internationally standardized configurations, utilizing imported low-voltage electrical components in a modular assembly with DIN rail mounting. Operation is managed via two cross-type master controllers and pushbutton switches centralized in the driver's cab, eliminating numerous intermediate relays and time relays required for logic control. Global sourcing incorporates international products such as OMRON PLCs and Schneider contactors, significantly enhancing overall system reliability while facilitating fault diagnosis, localization, and troubleshooting. Additional safety devices include anemometers, obstruction lights, axle break protection for the trolley, and traction protection. Schneider contactors, significantly enhancing overall system reliability while facilitating fault diagnosis, localization, and resolution. Additional safety features include electrical devices like anemometers and obstruction lights, alongside mechanical safeguards such as trolley axle break protection and traction rope break anti-runaway mechanisms.