QTZ125A tower crane

QTZ125A tower crane is a reinforced tower crane designed to meet GB/T5031<< >> and GB5144<< >> and other standards of tower crane safety regulations, rated lifting moment 125t·m, the maximum lifting weight is 8 tons, TC6015, TC5518, TC5022, TC4526 and other types. The machine speed regulating pole change motor hoist, slewing mechanism for variable frequency speed regulating mechanism, luffing mechanism planetary gear reducer internal drum, electric control system adopts imported components, security protection device for mechanical or electromechanical integration products, complete and reliable, the machine has a fixed, walk, adhesion, climbing and so on work type, can meet the city the high-level construction, industrial plant, power station dam, Bridges and other construction needs.

Technical parameters of QTZ125A

[lifting mechanism] :

The lifting mechanism (2492Kg) adopts yzrswf250m2-4/8 winding motor, which drives the reduction box through the toothed coupling and drives the reel. Three different lifting speeds are obtained, and the braking is stable and the impact is small. When using 2 ropes, the speed can reach 100m/min, 50m/min and 8.5m/min; when using 4 ropes, the speed can reach 50m/min, 25m/min and 4.25m/min.

A normally closed hydraulic push rod brake (ywz3h315/90) is installed at the input shaft end of the reduction gear box (see figure 4-13). There is a height limiter on one side of the reel, which can be adjusted according to the required height, with reliable control, simple operation and convenient maintenance.

[rotating mechanism] :

The rotary mechanism is a transmission device that provides power for the upper part of the tower crane. The device consists of a torque motor with a brake on the tail, a planetary reducer, a pinion and a rotary limiter. This tower machine adopts two sets of such devices, which are symmetrically distributed on both sides of the slewing bearing and mounted on the upper bearing, and the pinion gear meshes with the large tooth ring of the slewing bearing.

A disc brake with a normally open state at the input end of the reducer; Can be used for tower crane jacking and fixed point operation of the boom brake positioning.

The slewing limiter is used to control the tower crane to turn only 540° in one direction to avoid twisting the cable.

[luffing mechanism] :

The luffing mechanism (510Kg) mining motor yej112-4-4kw drives the drum through the planetary reducer and enables the truck to run at three speeds of 0 ~ 60m/min at high speed on the derrick.

Motor tail with a regular closed brake, when the car motor power delay brake.

The amplitude limiter is used to prevent misoperation and stop the car before it hits the buffer at the base of the boom.

[tower body standard section] :

Local close-up of the main limb

There are two specifications for the tower body joints according to the design strength, namely the reinforcing joint and the standard joint. The reinforcing joint is 2mm thicker than the wall of the standard joint. The reinforcing joint and the standard joint are connected by special high-strength bolts of 8-m36.

Lifting arm

The lifting arm is divided into 11 sections. The upper chord of the third and eighth lower arm is provided with a lifting point of a tie rod, and the arms are connected by a pin shaft. The first arm is equipped with a trolley traction mechanism, and the arm end is equipped with a wire rope anti-twisting device. The maximum arm length is 60 meters, which can also be assembled into three arm lengths, namely 55 meters, 50 meters and 45 meters, to meet the needs of different rotating Spaces. A trolley luffing mechanism is installed in the root section of the boom and a platform frame is provided to facilitate installation and maintenance.

【 balance arm 】:

The balancing arm is divided into two sections, one section of 6.92 m and one section of 6.3 m, connected by a pin shaft. With the help of the pin shaft, the balance arm and the balance arm tie rod are connected with the rotary tower body and the top of the tower into a whole.

[upper and lower supports] :

The upper support is mounted on the slewing support and is connected with the inner ring of the slewing support. The lower support is a box bearing of the non-slewing part of the crane, the upper plane of which is equipped with a slewing ring. The lower support is connected with the outer ring of the slewing ring by bolts, and the relative slewing motion between the upper and lower supports is realized by the slewing mechanism. The upper support is connected with the rotary tower body, and the lower support is connected with the standard section of the tower body.



[rotary tower] :

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

[rotary limiter] :

【 tower top 】:

The top of the tower is an oblique cone, the upper end is connected to the boom arm and the balance arm by a pull rod to keep the two arms horizontal, and the lower end is connected by four pin shafts

The rotating tower body is connected. In order to install the heavy arm pull rod and the balance arm pull rod, the upper part of the tower top is provided with a working platform and pulley block.

[cab] :

The cab is the workshop where the driver operates the tower crane, which is fixed on the right side of the rotary tower. Each indicator light and handle of the linkage control console are located on both sides of the driver's cab seat, which is easy to operate and has a broad field of vision.

The bridge electric cabinet is arranged in the rear of the bridge, main circuit breaker, lighting and auxiliary circuit breaker and other devices.

[attachment device] :

The attachment frame is an anchor device that attaches the tower crane to one side of the building in order to enhance its stability and keep its lifting capacity when the tower crane has reached the limit of free height and needs to continue jacking up. It consists of a set of ring beams and four struts. During installation, the ring beam is fastened to the tower body, and the two ends of the strut are hinged with the ring beam and the embedded bearing on the building respectively. By adjusting the screw, the four strut rods are tensed-so that the tower crane can be reliably connected with the horizontal vertical building and keep the axis of the tower crane perpendicular to the ground.

[weight limiter] :

[walking device] :

Walking mechanism has two active trolley, the active trolley is composed of motor, hydraulic coupling, worm gear reducer, disc brake, open gear and traveling wheel. The hydraulic coupler ensures the starting braking of the tower crane is stable and the walking speed is 20 meters/min.

The yz160m2-6-7.5kw ac motor controls the operation of the mechanism with the help of the main command controller. The normally closed disc brake at the end of the worm shaft is released when working, and the brake is delayed after shutdown and power failure. The delay time can be adjusted to ensure the short sliding distance of the stop and no shaking of the tower 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.

[electronic control system and safety device] :

This system USES a programmable logic controller for central control, adopt the internationally used type of electric control system and low voltage electrical appliances imported electrical components, modular combination, rail style installation, the focus on two cross the main controller and the driver room button switch control, saves a lot of intermediate relay and time relay for logic control, adopting global procurement at the same time, using the international famous brand products, such as OMRON PLC (OMRON), Schneider contactor, thus greatly improve the reliability of the whole system, but also provides a convenient fault judgment positioning and eliminate. In addition, it also includes electrical safety devices such as anemometer, obstacle light, and mechanical safety devices such as trolley shaft breaking protection and traction rope breaking rope preventing slipping.