Metro Gantry Crane

Metro Gantry Crane
 

In the construction of the subway tunnel, due to the limitation of the space structure, the excavated muck cannot be stored in the tunnel for a long time, so it is necessary to use a lifting crane to lift the muck from the ground to the ground for disposal.
 

A higher working cycle is required to achieve higher work efficiency, and at the same time, it can realize the function of automatic slag dumping to ensure the smooth construction of the tunnel, so the design of the lifting crane (trolley for short) of Metro Gantry Crane is very important, and It is very necessary to understand the working principle of trolley lifting and turning slag.
 

1. Structural composition and main features
 

Metro Gantry Crane is mainly composed of hoisting mechanism, spreader structure, slag dumping mechanism and operating mechanism.
 

Its main features are: while improving the lifting mechanism of conventional gantry cranes, a slag turning mechanism specially designed for subway construction is added to improve the construction efficiency of the project, and at the same time reduce the number of accidents caused by the participation of multiple personnel. security risks.
 

2. Lifting mechanism of trolley
 

The lifting mechanism is mainly composed of motor, reducer, brake, coupling, floating shaft and reel.
 

The motors all adopt the more mature frequency conversion brake motors in China, which can eliminate the large impact force caused by the fast lifting speed.
 

The motor is connected to the reducer through a floating shaft and a drum-type gear coupling, and the low-speed end of the reducer drives the reel wound with the wire rope. By controlling the positive and negative rotation of the motor, the lifting and lowering of the spreader can be realized.
 

A screw height limiter and an overload protection limiter are installed at the end of the drum, and a set of hydraulic block brakes are installed on both sides of the high-speed shaft end of the reducer. unnecessary loss.
 

Due to the high lifting height during subway construction, the rope capacity of the drum is relatively large. In order to reduce the angle of the rope entering the drum, increase the lifting speed and improve work efficiency, two sets of double-connected coils should be adopted. . At the same time, the problem of excessive bending stress caused by the excessive length of the reel can be reduced.
 

3. Spreader structure
 

The spreader structure is mainly composed of movable pulley blocks, balance beams, forks and suspenders. It is mainly used to lift and transport the slag bucket filled with slag.
 

In order to prevent the slag hopper from rotating during the lifting process, two sets of movable pulley blocks are set on the spreader, and the length and section size of the balance beam of the spreader are set according to the actual size of the slag hopper to meet the strength requirements. The form of the sling is determined according to the size of the hoisting head of the slag hopper.
 

The sling and the balance beam are connected by a fork with vertically arranged upper and lower shaft holes, which not only ensures the easy disassembly of the slag hopper and the spreader, but also ensures the left and right swing of the slag hopper to prevent tipping during the lifting of the slag.
 

4. The slag turning mechanism of the trolley
 

The slag turning mechanism is mainly composed of a telescopic oil cylinder and a slag turning hook. The slag dumping mechanism uses the working principle of the four-bar linkage to assist the main hoisting mechanism spreader and the slag hopper to complete the slag dumping work. The main working principles are:
 

① Install the designed lifting protrusion on the slag hopper to the sling of the sling, and the interface on the sling is designed to be installed in the form of a large top and a small bottom, which can not only ensure that the slag hopper is always fixed on the sling during use, but also can Realize flip operation;
 

② Lift the slag hopper so that the bottom of the slag hopper exceeds the center of the hook, and the oil cylinder is fully extended during this process;
 

③Retract the oil cylinder until the hook moves forward to the lower part of the lower hanging point of the slag hopper. At this time, lower the slag hopper so that the flipping head of the slag hopper falls accurately on the slag turning hook;
 

④ The lifting tool drives the lifting protrusion of the slag hopper to continue to fall, so that the slag hopper continues to tip over with the turning protrusion as the center of the circle, realizing the dumping of the slag in the slag hopper;
 

⑤ After dumping the muck to the designated position, lift the sling so that the overturning protrusion of the dregs hopper is separated from the dregs dumping hook, and at this time, fully extend the telescopic oil cylinder to make the dregs dumping hook leave the bottom of the dregs hopper;
 

⑥ Lower the slag hopper to the underground slag loading position to prepare for the next working cycle.
 

5. Trolley traveling mechanism
 

The traveling mechanism of the trolley is mainly composed of a buffer, a geared motor, a beam and a wheel set.
 

The traveling mechanism is driven by a three-in-one parallel shaft helical gear motor, and the wheel shaft on the wheel set can be directly inserted into the hollow shaft of the gear motor. Compared with the split drive mechanism, it has compact structure, small size, light weight and low noise. High efficiency; easy to install and run smoothly, easy to connect with the wheel set and easy to disassemble and repair.

The original conventional lifting mechanism is improved to give full play to the advantages of stable performance of the original system; at the same time, a new special slag dumping mechanism is added according to customer needs, and Metro Gantry Crane can fully meet the requirements of automation and high efficiency.

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