What is the purpose of an electric grab crane?
Grab crane is a crane equipped with a grab bucket, which can grab goods like a human hand. It is usually used to carry various bulk goods, logs, minerals, coal, gravel, earth and stone, etc. In terms of type, grab cranes are generally divided into bridge grab cranes, gantry grab cranes, and folding arm grab cranes. The grab cranes that people usually refer to are folding arm grab cranes. After the grab crane adopts PLC, frequency converter, and position encoder intelligent control, the system is more efficient and energy-saving. The system can quickly and conveniently adjust the speed and acceleration time of each gear of the lifting mechanism according to the on-site conditions of the crane, making the crane operation more flexible. Electric grab crane is a lifting equipment widely used in ports, docks, mines, construction sites and other places. It drives the opening and closing action of the grab bucket through an electric motor, and is used to grab and carry bulk materials such as coal, ore, sand and gravel, etc. The main components of the electric grab crane include the bridge, trolley, trolley running mechanism, driver's cab and electrical control system. Electric grab cranes can be divided into many types according to different structures and uses, such as QZ electric double-beam grab bridge crane and LZ grab electric single-beam crane.
QZ electric double beam grab bridge crane
The double-beam structure design gives it excellent load-bearing capacity. The two main beams evenly share the weight of the heavy objects, allowing the crane to lift heavier bulk materials. Compared with single-beam cranes, the QZ electric double-beam grab bridge crane can carry more weight at the same span, which is crucial for operating scenarios that handle heavier materials such as high-density ore. For example, when moving iron ore in large mines, it can easily cope with the lifting needs of large quantities of heavy materials to ensure the efficient operation of the production process.
The double-beam bridge and the well-configured trolley and carriage running mechanisms together ensure the high stability of the crane operation. During operation, the double-beam structure of the bridge can effectively disperse stress and reduce vibration and shaking. The trolley moves smoothly on the double beams and the carriage runs more smoothly on the track. This stability is particularly prominent when grabbing and transporting materials, especially when high-precision operations are required, such as accurately placing materials at the transport vehicle or the entrance of a specific processing equipment. It can avoid problems such as spilling materials or inaccurate placement due to crane shaking.
Thanks to its advanced electrical control system and reasonable mechanical structure design, the QZ electric double-beam grab bridge crane has excellent precision operation performance. The operator can finely adjust the opening and closing of the grab, the operation of the trolley and the large car through the control handle and buttons in the driver's cab. For example, in port loading and unloading operations, when grabbing coal from the cabin, the opening angle and the lowering depth of the grab can be accurately controlled to achieve the best grabbing effect; when placing coal on the conveyor belt, the position and height of the crane can be accurately controlled to ensure that the coal falls on the conveyor belt accurately without coal scattering or colliding with the equipment.
LZ type electric double beam grab bridge crane
The main structural feature of the LZ grab electric single-beam crane is the single-beam bridge. This single-beam design makes the crane structure relatively simple and compact, and has certain advantages in space utilization. The bridge is usually made of an I-beam or other steel, which reduces the amount of material used and thus reduces the weight of the equipment to a certain extent. For example, in some small indoor warehouses or workshops, the space is relatively narrow, and the single-beam crane will not take up too much space, making it easier to carry out material handling operations in a limited space.
The trolley and carriage operating mechanisms of this crane are relatively simple. The trolley runs along the track on the single-beam bridge and moves horizontally through an electric drive device, which can drive the grab bucket to accurately position at different positions in the material pile. The carriage operating mechanism enables the entire crane to move longitudinally on the ground track, expanding the operating range. Although the mechanism is simple, through reasonable design and precise manufacturing, these operating mechanisms can ensure the stability and efficiency of the crane during operation and meet the speed and accuracy requirements of general material handling.
The electrical control system of the LZ grab electric single beam crane is integrated in a small control box, which is usually located in the appropriate position of the crane's bridge or trolley. This control system is mainly used to control the electric motor to realize the opening and closing of the grab and the operation of the trolley and the large vehicle. Due to the use of advanced electrical control technology, the system has a high degree of automation and can realize some basic automatic operation functions, such as automatic positioning, automatic grab and release, etc., and can easily set and adjust parameters to adapt to different working environments and material handling requirements.
Due to its relatively simple structure, the LZ grab electric single-beam crane requires relatively low materials, parts and labor costs during manufacturing and installation. This makes it more attractive in some cost-sensitive projects or small enterprises. For example, for some small building materials warehouses or production workshops of township enterprises, this low-cost crane can meet basic material handling needs without bringing too high equipment investment burden to the enterprise.
The single-beam structure and simple operating mechanism make the LZ grab electric single-beam crane more flexible to operate. It can quickly move the grab in a small working area to grab and place materials. The operator can easily control the various movements of the crane through simple control buttons or joysticks, without the need for complex operation training. Moreover, due to its flexible maneuverability, it can adapt to some irregularly shaped work sites or material stacking layouts and effectively complete material handling tasks.
Although its lifting capacity and working span are relatively smaller than those of double-beam cranes, it can still play an important role in many occasions. It is suitable for places with small lifting capacity and low working level requirements, such as small grain warehouses, material stacking areas of construction sites, and auxiliary operation areas of small mines. In these places, it can be used to carry bulk materials such as grains, sand, small batches of ore, and clean up some small construction waste.
Although its lifting capacity and working span are relatively smaller than those of double-beam cranes, it can still play an important role in many occasions. It is suitable for places with small lifting capacity and low working level requirements, such as small grain warehouses, material storage areas of construction sites, and auxiliary operation areas of small mines. In these places, it can be used to carry bulk materials such as grains, sand, small batches of ore, and clean up some small construction waste.
