The stage electric hoist is an electric lifting device specifically designed for the hoisting and positioning of stage mechanical equipment. The following is an introduction from aspects such as its structure, working principle, characteristics, and classification: Structural Composition - Drive Unit: Usually composed of a motor, a speed reducer, etc., it provides power for the electric hoist, enabling it to lift and lower heavy objects. The motor generally has a high starting torque and good speed - regulating performance to meet the requirements for speed and force during the hoisting of stage equipment. - Transmission System: Mainly includes gears, chains, or wire ropes, etc. It transmits the power of the drive unit to the drum or sprocket, driving the hook to move up and down. The accuracy and reliability of the transmission system are crucial to the operational stability of the electric hoist. - Drum and Hook: The drum is used to wind the wire rope or chain, and the lifting and lowering of the hook are achieved through the rotation of the drum. The hook is the component that directly bears the heavy object. It is usually made of high - strength alloy steel and has sufficient strength and toughness to ensure safe hoisting. - Control System: Includes operation buttons, a controller, limit switches, etc. The operator controls the actions of the electric hoist, such as lifting, lowering, and stopping, through the operation buttons. The controller precisely controls the operation of the motor, and the limit switches are used to prevent the hook from exceeding the limit position, ensuring the safety of the equipment and personnel. - Safety Devices: Commonly, there are overload protection devices, chain breakage protection devices, braking devices, etc. The overload protection device can automatically stop the hoisting when the heavy object exceeds the rated load. The chain breakage protection device can quickly brake when the chain breaks to prevent the heavy object from falling. The braking device can reliably stop the drum when the electric hoist stops running, avoiding the heavy object from sliding down. Working Principle The stage electric hoist drives the speed reducer through the motor, and the speed reducer drives the drum to rotate, causing the wire rope or chain wound on the drum to be wound or unwound, thus realizing the lifting and lowering movement of the hook and achieving the purpose of hoisting stage equipment. During the operation process, the control system will precisely control the speed, rotation direction, etc. of the motor according to the operator's instructions and the operating status of the equipment, ensuring the smooth and accurate operation of the electric hoist. At the same time, the safety devices will monitor the operation of the equipment in real - time. Once abnormalities occur, such as overloading or chain breakage, the braking device will be immediately activated to stop the operation of the electric hoist and ensure safety. Characteristics - Precise Positioning: It has a high positioning accuracy and can accurately hoist stage equipment to the designated position, meeting the precise requirements for equipment layout in stage performances. - Smooth Operation: Adopting advanced transmission technology and control systems, it has low vibration and noise during operation, will not interfere with stage performances, and can provide the audience with a good viewing experience. - Safe and Reliable: Equipped with a variety of safety protection devices, it can effectively prevent the occurrence of various safety accidents, ensuring the safety of stage equipment and personnel. - Convenient Operation: The operation is simple and convenient. The operator can easily achieve various actions of the electric hoist through the control buttons, reducing the operation difficulty and improving work efficiency. - Diversity: According to different stage needs, different specifications and models of electric hoists can be selected, such as single - speed, double - speed, variable - frequency speed - regulation, etc., to meet different hoisting requirements. Classification - By Drive Mode: It can be classified into types such as electric drive, manual drive, and pneumatic drive. The electric - driven electric hoist is commonly used on the stage, which has the advantages of strong power and convenient operation. - By Lifting Mechanism: It can be divided into wire - rope electric hoists and chain - electric hoists. The wire - rope electric hoist has a relatively large lifting height and is suitable for the hoisting of large - scale stage equipment. The chain - electric hoist has a compact structure and a small volume and is often used in stage scenes with limited space. - By Operating Mode: It can be divided into fixed - type and traveling - type. The fixed - type electric hoist is installed in a fixed position and is used to hoist equipment at a specific location. The traveling - type electric hoist can move on the track, enabling a wider hoisting range.

With its characteristics of high efficiency, precision, and safety, the stage electric hoist has become an indispensable and important device in modern stage performances,

providing strong technical support for the presentation of stage art.