AQ-QZ Grab overhead crane is suitable for metallurgy, building materials, chemical industry, coal and other industries. It is used for loading and unloading of ore, slag, coke, coal, sand and other bulk materials in workshops, warehouses or open spaces.
Main structure: the whole equipment is mainly composed of bridge, crane running, trolley, grab, cab and electrical equipment.
The grab crane adopts the structure of double beam and double rail and single winch trolley.
The trolley of the crane is equipped with two sets of hoisting mechanisms, each of which adopts double drum, which is symmetrically arranged. The supporting rope and opening and closing rope of the grab are operated respectively. The operation is convenient, the operation is stable and the productivity is high.
The double girder grab overhead crane is mature and reliable, easy to operate, stable operation, advanced technology, is our company’s mature products for many years.
Crane Span Structure
The bridge is the main load-bearing component of the crane, which adopts the structure of double beam and double rail, with the main beam and end beam as the main load-bearing parts, supplemented by trolley rail, walking platform, railing, ladder and other auxiliary metal structures.
The main beam is a normal rail box structure, and the section of the main beam is analyzed and calculated by ANSYS finite element method to ensure that it has sufficient strength, stiffness and overall stability.
Submerged arc welding or gas shielded welding shall be used for the transverse butt welding joints between the cover plate and web plate of the main beam and end beam, and the joint weld between the web plate and the cover plate, and the nondestructive testing shall be conducted after welding.
The trolley track adopts the whole track with welded joints to ensure the car running well.
The end beam is a box structure. The connection between the end beam and the main beam is rigid connection. High strength bolts are used for connection at the disconnection of the end beam. The reamed bolt is used for positioning on each connecting plate. The positioning mark has been made before delivery.
In order to facilitate transportation, loading and unloading as well as installation and hoisting on site, lifting lug and lifting hole for hoisting are set on main parts. The strength and position of these lifting lug and lifting hole shall fully consider the safety and convenience of hoisting.
Driver’s Cab
The driver’s cab is the working place for the operator to operate the crane, which adopts the enclosed and toughened glass cab. Its structural design not only considers various functional requirements, strong and durable, safe and reliable, but also considers good vision, comfortable and beautiful, so that the driver can feel comfortable in operation.
In order to ensure that the operator has a wide field of vision, toughened glass is installed on the front top, front lower side wall and rear wall of the cab. The maximum elevation angle of the driver’s seat is 55 ~ 60 ° and the maximum depression angle is 70 ~ 75 ° and the maximum front view angle of the driver is 120 ° when the driver does not move. The seat rotation can reach the range of 270 ° of the front view angle.
The frame of the cab is welded by rolled section steel and pressed steel sheet, and the floor surface is paved with insulating rubber carpet. Both sides of the glass can be wiped safely and conveniently. The upper part of the window frame is fixed with the cab frame.
An alarm is also set in the cab to ensure the safe operation of the crane.
The layout of various settings in the driver’s cab fully considers the convenience of driver’s maintenance, operation, activity space and smooth walking. Ensure that the driver can quickly and safely withdraw in case of accident.
Crane Running Mechanism
The crane is supported by four wheels and driven by two independent driving systems.
The transmission type of the crane driving system is: a motor drives a reducer through gear coupling and transmission shaft, and the low-speed shaft of the reducer is connected with the wheel shaft by the coupling, and the driving wheel ratio is 1:2. When starting, the driving wheel does not slip, and when braking, it is stable and reliable. This kind of structural arrangement is beneficial to the installation, maintenance and disassembly of various parts of the drive system.
The wheel diameter and material selection of the crane running mechanism is based on the maximum supporting force of the wheel under the most unfavorable working conditions, so as to ensure that some wheels will not be overloaded.
Lifting Mechanism
The trolley of the crane is equipped with two sets of hoisting mechanisms, each of which adopts double drum, which is symmetrically arranged. The supporting rope and opening and closing rope of the grab are operated respectively. The operation is convenient, the operation is stable and the productivity is high.
The working principle of crane lifting mechanism: the motor works, changes speed through the reducer, drives the drum through the drum coupling, and completes the lifting, opening and closing of the grab through the wire rope winding system.
The scheme of supporting braking and control braking is adopted for the braking of hoisting mechanism. Electric braking is adopted for control braking, while brake is set on the high-speed shaft of motor for braking, so as to make the braking of lifting mechanism stable, safe and reliable.
Trolley Running
The trolley running mechanism is supported by four wheels, and a set of independent driving system is adopted to drive the trolley centrally.
The transmission type of the trolley drive system is: a motor drives a vertical reducer through a gear coupling. The two low-speed shafts of the reducer are connected with the two wheel shafts with the coupling and transmission shaft. The driving wheel ratio is 1:2. When starting, the driving wheel does not slip, and when braking, it is stable and reliable. This kind of structural arrangement is beneficial to the installation, maintenance and disassembly of various parts of the drive system.
The wheel diameter and material selection of the trolley running mechanism is based on the maximum supporting force of the wheel under the most unfavorable working conditions, so as to ensure that some wheels will not be overloaded.
