German loeffert tools loeffert models loeffert prices

loeffert tools are material handling tools for lifting or jacking heavy loads, operating intermittently to lift weights. Most lifting tools begin vertical or combined vertical and horizontal travel after the lifting gear picks up the load, unload at the destination, then return empty to the pickup point to complete one work cycle before performing the second lift. Generally, during operation, lifting tools perform picking, moving, and unloading sequentially, with the corresponding mechanisms working intermittently. Lifting tools are mainly used to handle piece goods; equipped with grabs, they can handle bulk materials such as coal, ore, and grain; equipped with ladles, they can lift liquid materials such as molten steel. Some lifting tools, such as elevators, can also carry people. In certain applications, lifting equipment is the primary operational tool, for example, cranes loading and unloading materials at ports and stations are the main operational tools.

loeffert tool description

Lifting tools vary in purpose and construction, but all possess a hoisting mechanism to achieve the basic motion of lifting and lowering. Materials can be lifted and lowered suspended by flexible elements such as wire ropes or lifting chains, or jacked up by screws or other rigid components. Lifting tools are classified by structure into light and small lifting equipment, hoists, and overhead monorail systems. Light and small lifting equipment mainly includes pulley blocks, lifting gear, jacks, triangular hand chain hoists, electric hoists, and standard winches; most are compact, lightweight, and simple to use. Except for electric hoists, the vast majority are human-powered, suitable for less demanding tasks. They can be used individually or in combination. Some light and small lifting equipment has high lifting capacity; for example, the lifting capacity of hydraulic jacks has reached 750 tons. Mine hoists and skip lifts mainly perform vertical or near-vertical lifting motions along fixed paths. Overhead monorail systems have routes formed by rigid suspension rails, capable of transporting materials to various parts of a factory building and extending outside the building.

loeffert tool parameters

The primary performance parameters characterizing the basic working capability of lifting tools are lifting capacity and work class. (1) Lifting capacity refers to the maximum weight of the load allowed to be lifted under specified working conditions, i.e., the rated lifting capacity. Generally, if equipped with a permanent magnet lifter (see permanent magnet lifter), its lifting capacity must also include the weight of the permanent magnet lifter. (2) Work class is a performance parameter reflecting the overall working status of the lifting tool and is an important basis for designing and selecting lifting tools. It is determined by the total number of work cycles required to be completed during the required service period and the load state. For lifting tools with strong regularity and high repeatability in operation programs, such as electric hoists for loading and unloading ship cargo at docks, hand chain hoists for high-bay warehouses, and skip lifts for feeding blast furnaces, the work cycle is also an important parameter. The work cycle refers to the time required to complete one work cycle, which depends on the operating speed of the mechanism and is related to the handling distance. The aforementioned lifting tools sometimes also use productivity as an important parameter, usually expressed as the lifting volume completed per hour. In current usage, efficiency is the priority, followed by appearance and quality.

loeffert tool features

1) Lifting tools are typically compact with simple mechanisms, capable of performing lifting and horizontal movements. 2) The loads handled by lifting tools are diverse, and the loads vary. Some heavy loads weigh hundreds or even thousands of tons, some objects are tens of meters long, and shapes are highly irregular, including bulk particles, molten states, and flammable, explosive, or hazardous materials, making the lifting process complex and dangerous. 3) Some lifting tools need to operate within a large spatial range; some require installation of rails and wheels (such as tower cranes, bridge cranes, etc.); some require tires or tracks to move on the ground (such as truck cranes, crawler cranes, etc.); some need to travel on wire ropes (such as passenger and freight aerial ropeways), resulting in a large activity space, and once an accident occurs, the impact range is also large. 4) Some lifting tools need to directly carry personnel for lifting and lowering movements on guide rails, platforms, or wire ropes (such as elevators, lifting platforms, etc.), and their reliability directly affects personal safety. 5) Lifting tools have many exposed, moving parts and often come into direct contact with lifting personnel (such as hooks, wire ropes, etc.), posing many potential accidental hazards. 6) Complex operating environment. From large integrated steel enterprises to modern ports, construction sites, railway hubs, and tourist attractions, lifting tools are in operation; workplaces often encounter hazardous factors such as high temperature, high pressure, flammability, explosiveness, power transmission lines, and strong magnetic fields, posing threats to equipment and personnel. 7) Lifting tool operations often require coordination among multiple people. One operation requires skilled coordination, coordinated actions, and mutual awareness among command, rigging, and driving personnel. Personnel should have the ability to handle on-site emergencies. Close cooperation among multiple personnel is usually quite difficult. The aforementioned working characteristics of lifting tools determine their significant relationship with safe production. Slight negligence in the design, manufacturing, installation, use, and maintenance of lifting tools may cause casualties or equipment accidents. On one hand, this causes personnel casualties; on the other hand, it causes significant economic losses.

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