QTZ125A / 125F (6015)

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The maximum lifting load of QTZ125A is 8 tons.

The maximum lifting load of QTZ125F is 10 tons.


QTZ125 tower crane is a reinforced tower crane designed to meet the standards of GB/T5031<<Tower Crane>> and GB5144<<Tower Crane Safety Regulations>>, with a rated lifting moment of 125t·m and a maximum lifting capacity of 8 Tons, there are TC6015, TC5518, TC5022, TC4526 and other types. The hoisting mechanism of this machine is pole-changing and speed-regulating, the slewing mechanism is a variable-frequency speed-regulating mechanism, the luffing mechanism has a built-in reel of planetary gear reducer, the electronic control system adopts imported components, and the safety protection device is a mechanical or mechatronic product, complete and reliable , This machine has working types such as fixed, walking, attachment, and internal climbing, which can meet the needs of urban high-rise buildings, industrial plants, power station dams, bridges and other construction needs.


【Lifting mechanism】:

The hoisting mechanism (2492Kg) adopts YZRSWF250M2-4/8 type winding motor, which drives the reduction box through the gear coupling, and then drives the reel. Three different lifting speeds can be obtained for the hoisting, the braking is stable and the impact is small. When using 2 ropes, the speed can reach 100m/min, 50m/min, 8.5m/min, and when using 4 ropes, it can reach 50m/min, 25m/min, 4.25m/min.

A normally closed hydraulic push rod brake (YWZ3H315/90) 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. The height limiter can be adjusted according to the required height, with 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 torque motor with a brake at the tail, a planetary reducer, a pinion, a rotation limiter, etc.; the tower crane uses two sets of such devices, symmetrical The ground is distributed on both sides of the slewing support and is installed on the upper support. Its pinion gear meshes with the large ring gear of the slewing support.

The input end of the reducer is equipped with a disc brake in a normally open state; 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 (510Kg) adopts the motor YEJ112-4-4kw, drives the reel through the planetary reducer, and uses the steel wire rope to make the trolley obtain three speeds of 0-60m/min and run back and forth on the boom at high speed.

There is a normally closed brake at the end of the motor, which delays braking when the trolley motor is powered off.

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

【Tower Body Standard Festival】:

Close-up of main limb

The tower body section has two specifications according to the design strength, namely the reinforced section and the standard section. The reinforced section is 2mm thicker than the standard section. The reinforced section and the standard section are connected by 8-M36 special high-strength bolts. There is a rest platform for every three sections. The standard section of the same specification is interchangeable.

【Lifting arm】:

The boom is divided into 11 sections. The upper chords of the third 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 60 meters, and can be assembled into three arm lengths of 55 meters, 50 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 2 sections, one is 6.92 meters, and the other is 6.3 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.

【Turning tower body】:

The lower end of the slewing tower body is connected with the upper support by 8 high-strength bolts, the upper part is pin-connected with the tower top, and the front and rear end ear plates are respectively connected with the balance arm and the crane arm. The upper part is equipped with a lifting weight limiter.

【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.


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.

【Attachment device】:

The attachment frame is an anchoring device that attaches the tower crane to the side of the building in order to enhance its stability and maintain its lifting capacity when the tower crane has reached the free height limit and needs to continue to be lifted upwards. It consists of a set of ring beams and 4 struts. During installation, the ring beam is tightly clamped to the tower body, the two ends of the support rods are respectively hinged with the ring beam and the embedded support on the building, and the 4 support rods are tensioned by the adjusting screw, so that the tower crane can be reliably connected with the vertical building on the horizontal plane. Together and keep the tower crane axis perpendicular to the ground.

【Lifting weight limiter】:

【Walking device】:

The traveling mechanism has two active trolleys. The active trolley consists of a motor, a hydraulic 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 system adopts programmable logic controller for central control. The electronic control system adopts international general type. The low-voltage electrical appliances adopt imported electrical components, modular combination, and rail-mounted installation. It adopts two cross-type master commands centralized in the cab. The operation of the switch and the button switch saves a large number of intermediate relays and time relays for logic control. At the same time, it adopts global procurement and uses international brand-name products, such as OMRON (Omron) PLC and Schneider contactors, thus greatly This improves the reliability of the entire system, and at the same time provides convenience for fault judgment, location and elimination. 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.

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