Before the advent of double-hook electric hoists, when equipment such as power station trash racks, maintenance gates, and tailrace maintenance gates required simultaneous lifting and lowering at two suspension points, it was common to use two electric or manual chain hoists of the same model. With two electric or manual hoists operating in tandem, the power is supplied from two separate sources, resulting in uneven load distribution and, consequently, unequal lifting forces at the two suspension points. Even if two motors of identical power and model are running at their rated speed, their speeds may still differ; such load imbalance will inevitably affect the lifting speeds at the two suspension points during operation. During the lifting process, positional errors are also difficult to avoid. Therefore, for applications that demand synchronous and smooth lifting, a double-hook electric hoist is an ideal choice. Double-hook electric hoists are suitable for the following operating conditions:

Double-hook electric hoists are suitable for applications requiring synchronous lifting from two hoisting points. They can also be used for single-point lifting, where one hoisting point is in operation while the other remains idle.

It is a common operating condition for double-hook electric hoists to traverse overhead lines or to operate across different dam sections. To meet the requirements of the project layout, turning may also be necessary. To accommodate this, the traveling mechanism of the double-hook synchronous electric hoist is connected to the hoist body via a hinged design that allows rotation about a vertical axis. This enables the traveling wheels to follow the curvature of the track, with the hoist body behaving like a flexible cable that slides along the curved track to adapt to the turn. Such design meets the operational requirements.

Double-hook electric hoists are ideally suited for installation on suspended I-beams and can be computer-controlled to function as programmable hoists. Double-hook synchronous electric hoists are also widely used in single-girder cranes, electric single-girder suspension cranes, electric hoist gantry cranes, and electric hoist bridge cranes. These lifting devices are commonly employed in the water conservancy sector. The adoption of double-hook synchronous hoists significantly enhances construction efficiency by ensuring synchronized operation of the two hooks. Consequently, double-hook electric hoists boast a promising market outlook, with increasingly extensive applications in the water conservancy industry.

Before the advent of the double-hook electric hoist, when it was necessary to operate trash racks, maintenance gates, and powerhouse tailwater maintenance gates using two lifting points, it was common practice to employ two electric or manual chain hoists of the same model. With two hoists operating in tandem, the power is supplied from two separate sources, yet the load is not evenly distributed; consequently, the lifting forces at the two hoisting points are unequal. Even if two motors of identical power and model are running at their rated speed, there will still be variations in rotational speed. Coupled with uneven loading, this inevitably affects the lifting speeds at the two hoisting points during operation. As a result, positional errors are bound to occur during the lifting process. Therefore, for applications requiring synchronous and smooth lifting, a double-hook synchronized electric hoist is an ideal choice.

Double-hook synchronous electric hoists are suitable for overhead operation on suspended I-beams and can be equipped with microcomputer control to function as programmable hoists; they can also be configured as stationary units for single-girder, dual-luffing-point lifting applications. Furthermore, these hoists can be integrated into single-girder cranes, electric single-girder suspension cranes, electric hoist gantry cranes, and electric hoist bridge cranes—equipment that is commonly used in the water conservancy industry. The double-hook synchronization feature of these hoists provides significant operational convenience for construction projects.