The Wide Application and Principle Analysis of Leveraged Chain Crane

1、 Core working principle: The synergistic mechanical advantage of leverage and chain

The lever chain hoist is based on the principle of lever labor-saving and the chain transmission system to achieve the lifting operation of heavy objects. Its core mechanical structure can be disassembled into three parts:

Leverage handle system: amplifies human input torque through a long handle (lever arm). According to the principle of leverage (torque=force x arm), the length of the handle is usually designed to be 300-500mm, allowing the operator to apply a small force to drive the internal gear set.

Planetary gear reduction mechanism: The handle rotates to drive the small gear (sun gear), which drives the planetary gear to rotate around the inner ring gear, achieving multi-stage reduction and force increase. The typical transmission ratio can reach 1:32, which means that the handle rotates 32 times, the chain rises and falls 1 meter, and the output force is amplified 32 times.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment    

Chain transmission and braking system: The lifting chain is made of high-strength alloy steel (such as 80 grade chain, with a breaking force ≥ 800MPa), and is driven by meshing along the sprocket teeth. The braking system adopts a ratchet pawl self-locking structure. When the handle is released, the pawl automatically embeds into the ratchet tooth groove, achieving load hovering and anti fall.

2、 Wide range of industry application scenarios and typical cases

Leveraging the characteristics of no power dependence, high safety, and low cost, the lever chain crane has achieved large-scale applications in multiple industries

1. Industrial manufacturing and precision assembly

Light industry production: used in furniture manufacturing and metal processing workshops for lifting boards and mechanical parts to avoid manual handling damage. For example, a certain automotive parts factory uses a 3-ton manual chain hoist to achieve precise positioning of engine modules, increasing assembly efficiency by 40%.

High end manufacturing industry: used for fine tuning and installation of precision instruments and satellite components in the aerospace field; In the electronic chip production line, replacing electric hoists to avoid electromagnetic interference and ensure nanometer level accuracy.

Equipment Maintenance and Overhaul: Used in steel and chemical plants for the maintenance and hoisting of heavy equipment such as rollers and reaction vessels, in conjunction with movable gantry frames to achieve narrow space operations.

2. Construction of buildings and infrastructure

High rise building construction: used for vertical lifting and high-altitude installation of steel bars, precast concrete components, and steel structural components at construction sites. For example, during the construction of Shanghai center Building, several manual chain cranes are used to cooperate with tower cranes to complete the precise lifting of curtain wall unit plates.

Renovation of old buildings: In the renovation of historical buildings, due to its simple structure, no need for complex installation, and equipped with overload protection and limit devices, it has become the first choice for safety in high-altitude operations. The renovation project of the eaves of the Forbidden City in Beijing uses this equipment to lift ancient building components.

Bridge and Tunnel Engineering: In the installation of prefabricated bridge components and tunnel support operations, portable manual chain hoists are suitable for outdoor complex terrain, such as steel arch lifting in the construction of the Sichuan Tibet Railway tunnel.

3. Warehouse logistics and port operations

Container loading and unloading: At the port terminal, the use of bridge cranes enables rapid stacking and transportation of containers. The automated terminal of Qingdao Port uses manual chain cranes as auxiliary equipment to handle special sized containers.

Special storage environment: In explosion-proof warehouses and high-temperature smelting workshops, due to the absence of electrical components, the safety is significantly better than that of electric hoists. For example, a certain oil depot of Sinopec uses explosion-proof manual chain hoists to lift oil drums.

Automated three-dimensional warehouse: In the AGV (Automated Guided Vehicle) system, as the end effector, it achieves precise positioning and rapid turnover of goods, improving storage efficiency.

4. Energy and Emergency Rescue

New energy construction: used for the lifting and maintenance of wind turbine blades and towers in wind farms; In photovoltaic power plants, it is used for the installation and commissioning of photovoltaic panels.

Maintenance of power facilities: Suitable for high-altitude and narrow working environments during the lifting of high-voltage towers and substation equipment. A certain ultra-high voltage project of State Grid Corporation of China uses this equipment for insulator string replacement.

Emergency rescue and relief: Quickly deploy and transport materials during disasters such as earthquakes and floods; As a temporary lifting solution in power repair and mining rescue, such as heavy lifting during the construction of temporary bridges after the Wenchuan earthquake.

3、 Technological advantages and industry trends

Cost benefit ratio: Compared to electric hoists, manual chain hoists have a purchase cost reduction of over 50%, low maintenance costs, no need for power supply, and are suitable for scenarios without power or budget sensitivity.

Safety performance: Built in overload protection device (such as friction plate clutch), limit switch, to prevent overload and excessive lifting; The ratchet braking system ensures safe load hovering.

Environmental Protection and Sustainability: Adopting recyclable alloy materials to reduce resource consumption; Some models are equipped with low-noise gearboxes to meet strict environmental requirements.

Intelligent trend: The new manual chain hoist integrates electronic load display and remote monitoring module, realizing real-time data transmission and fault warning. For example, the intelligent manual chain hoist launched by a certain brand can monitor the equipment status through a mobile APP.