QTZ200 tower crane

QTZ200 tower crane is a reinforced tower crane designed to meet GB/T5031<<Tower Crane>> and GB5144<<Tower Crane Safety Regulations>> and other standards. The rated lifting moment is 200t·m and the maximum lifting capacity is 12 Tons, there are TC7020, TC6524, TC6028, TC5236 and other types. The hoisting mechanism, slewing mechanism, and luffing mechanism of the machine are all frequency conversion speed regulation mechanisms. The electronic control system adopts imported components. The safety protection device is a mechanical or mechatronic product. It is complete and reliable. The machine has fixed, walking, attached, Working styles such as internal climbing can meet the needs of urban high-rise buildings, industrial plants, power station dams, bridges and other construction needs.

QTZ200 technical parameters

【Lifting mechanism】:

The lifting mechanism (2200Kg) adopts YZP280M-6-65KW variable frequency motor. The motor drives the reduction box through the gear coupling, and then drives the reel. The speed is achieved through the frequency setting of the inverter. From 0 to each gear, there is stepless speed regulation, stable starting and braking, and low impact. When using 2 ropes, the speed can reach 0~102m/min, 0~51m/min, when using 4 ropes, it can reach 0~51m/min, 0~25.5m/min.

A normally closed hydraulic push rod brake (YWZ3H315/90) (850-900NM) is installed at the input shaft end of the gearbox (see Figure 4-13). A height limiter is installed on one side of the reel, and the height limiter can be adjusted according to the required height. Reliable control, simple operation and convenient maintenance.

【Rotary Mechanism】:

The slewing mechanism is a transmission device that provides power for the upper rotation of the tower crane. The device is composed of a motor, a planetary reducer, a pinion, a rotation limiter, etc.; the tower crane uses two sets of such devices, which are symmetrically distributed on the slewing support Both sides are installed on the upper support, the pinion gear meshes with the large ring gear of the slewing support, and the mechanism is driven by a torque motor with a brake.

The tail of the motor is equipped with a normally closed disc brake; it can be used for the lifting of the tower crane and the positioning of the crane arm during fixed point operation. The rotation limiter is used to control the tower crane to only rotate 540° in a certain direction to prevent the cable from being twisted.

【Luffing mechanism】:

The luffing mechanism (470Kg) uses a torque motor YLEF112L-95Nm, drives the reel via a planetary reducer, and uses a steel wire rope to make the trolley obtain a speed of 0-80m/min to run on the boom frame back and forth at high speed.

There is a disc brake at the end of the motor, which delays braking when the trolley motor is powered off (see Figure 4-15).

The amplitude limiter is used to prevent misoperation, so that the trolley stops before it hits the buffer at the root of the boom.

【Lifting arm】

The boom is divided into 11 sections. The upper chords of the third, seventh and eighth sections are each provided with a tie rod hanging point, and each section is connected by a pin. The first section of the arm is equipped with a trolley traction mechanism, and the arm end is equipped with a wire rope anti-twist device. The maximum arm length is 70 meters, and it can also be assembled into five arm lengths of 65 meters, 60 meters, 52.5 meters, and 45 meters to meet the needs of different rotating spaces. A trolley luffing mechanism is installed at the root section of the boom boom and a walking platform frame is provided to facilitate installation and maintenance.

【Balance Arm】

The balance arm is divided into 3 sections, two sections of 7.5 meters, and one section of 3 meters, connected by pins. With the help of a pin shaft, the balance arm and the balance arm tie rod are connected with the revolving tower body and the tower top into a whole, and there are railings and walkways on both sides of the balance arm.

【Upper and lower support】

The upper support is installed on the slewing bearing and connected with the inner ring of the slewing bearing. The lower support is a box-shaped support of the non-rotating part of the crane. The upper plane is equipped with a slewing ring outer gear. The lower support and the outer ring of the slewing ring are connected by bolts, and the upper and lower supports are realized by the slewing mechanism. Relative rotational movement between. The upper support is connected to the slewing tower, and the lower support is connected to the standard section of the tower.

【Rotation limiter】:

【Tower Top】

The top of the tower is an oblique cone. The upper end is connected with the lifting arm and the balance arm through a tie rod to keep the two arms level. The lower end is connected with 4 pins

The slewing tower body is connected. In order to install the boom pull rod and the balance arm pull rod, a working platform and a pulley block are set on the top of the tower.

【Cockpit】

The cab is the working room where the driver controls the tower crane. It is fixed on the right side of the slewing tower. The indicator lights and handles of the linkage console are located on both sides of the driver's cab seat, which is easy to operate and has a wide field of vision.

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

【Lifting weight limiter】:

【Walking device】:

The traveling mechanism has four active trolleys. The active trolley consists of a motor, a fluid coupling, a worm gear reducer, a disc brake, an open gear width, and a traveling wheel. The hydraulic coupling ensures that the tower crane starts and brakes smoothly, and the traveling speed is 20 m/min.

YZ160M2-6-7.5KW AC motor uses the master controller to control the operation of the mechanism. The normally closed disc brake at the end of the worm shaft is released when it is working, and brakes with a delay after the power is cut off. The delay time is adjustable to ensure that the stop sliding distance is short and the tower crane does not shake due to excessive braking.

Two travel switches are installed on the outside of the active trolley to control the tower crane to travel within the set limit position to ensure the safety of the tower crane.

【Electric control system and safety device】:

The QTZ200 electronic control system adopts the current advanced PLC + inverter control method, which greatly improves the reliability, maneuverability, stability of the system and the working efficiency of the machine. Due to the use of frequency converters, the various mechanisms have achieved stepless speed regulation, which greatly improves the stability of the entire equipment.

The electronic control components of this electronic control system are purchased globally. The PLC is Japan OMRON, the inverter is Japan Yaskawa, and the complete set of low voltage is Schneider. It is precisely because of this that the failure rate of the electronic control system is greatly reduced, and it is also a failure. The judgment positioning and exclusion provide convenience. In addition, it also includes electrical safety devices such as anemometers and obstruction lights, as well as mechanical safety devices such as trolley broken shaft protection and traction rope broken rope anti-slipping car.