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What is an overhead crane used for?

An overhead crane, also known as an “ bridge crane” or “traveling crane“, is based on elevated rails on both sides of a factory building. It operates in coordination with a longitudinal main trolley, a transverse auxiliary trolley, and a vertical hoisting mechanism, enabling precise three-dimensional displacement of heavy loads within the covered rectangular space. Its rated lifting capacity ranges from 1 ton to thousands of tons, and it is widely used in various industrial fields. Its core purposes can be systematically categorized as follows:     I. Classification by Core Functions   1. Heavy Load Handling and Transfer This is its most fundamental function. It replaces the primitive, inefficient, and high-risk manual handling, enabling fast and safe movement of materials in workshops, warehouses, and storage yards.   2. Precision Alignment and Assembly In modern high-end manufacturing, the role of overhead bridge cranes goes far beyond handling. With millimetric or even higher positioning accuracy and micro-speed lifting functions, they can accurately align and install huge components weighing hundreds of tons.   3. Special Process Operations By equipping with various specialized lifting tools (such as C-hooks, vacuum suction cups, electromagnetic discs, and rotating hooks), it can complete complex operations such as...

What are the electrical accessories of a crane and the components of its electrical control box?

1.Circuit Breaker The circuit breaker is a core safety protection device in the electric control box. When a hazardous fault occurs in the circuit, it quickly cuts off the power supply to prevent equipment damage or safety accidents (such as fire and electric shock). 2.Main Contactor It is the core executive component that connects the commands of the wireless remote control and the high-power main circuit of the crane. In essence, it serves as a “power switch hub” that receives signals from the wireless remote control and realizes the “controlled on-off” of the crane’s main circuit. 3.Phase Sequence Protector The phase sequence protector is a safety protection device in three-phase AC circuits that ensures the normal phase sequence and voltage of the power supply. Its core function is to detect the phase sequence, phase loss, and voltage stability of the three-phase power supply. When the power supply is abnormal, it cuts off the circuit to prevent equipment damage, misoperation, and safety accidents. 4.Control Transformer It is the core conversion device that connects the high-voltage main power supply and the low-voltage control circuit. Its functions include: reducing voltage to prevent burnout of control components; providing electrical isolation to prevent leakage interference,...

What is the difference between a hydraulic winch and an electric winch?

In industrial and engineering sectors, winches serve as critical lifting and traction equipment, whose performance directly impacts operational efficiency, safety, and operating costs. Hydraulic and electric drives, as two mainstream technical routes, each have distinct characteristics and applicable scenarios. Choosing between them is not a matter of pursuing so-called “more advanced technology” but rather making a systematic decision based on actual working conditions, load requirements, and environmental factors.    1. Core Differences: Power Transmission Mechanisms Determine Fundamental Performance   Hydraulic winches rely on a hydraulic system to transmit power. Typically driven by an engine or electric motor, a hydraulic pump converts mechanical energy into the pressure energy of hydraulic oil. The flow and pressure are regulated through control valves to drive the hydraulic motor, which outputs high torque and ultimately powers the drum. Their core advantages lie in smooth power transmission and strong overload capacity, making them particularly suitable for heavy-duty, low-speed, and continuous operation conditions. Electric winches use an electric motor as the direct power source. The motor’s speed and torque are adjusted through an electrical control system (such as a frequency converter or contactor), amplified by a gear reducer, and then drive the drum. The advantages of electric...

Electric Chain Hoist: Revolutionizing Heavy Load Handling in Confined Spaces

In industrial environments such as factories, warehouses, and equipment maintenance areas, space constraints often hinder traditional lifting equipment due to their bulky size and cumbersome operation. The ​​electric chain hoist​​ (Electric Chain Hoist) addresses these challenges through targeted design, prioritizing ​​compact structure​​, ​​precision control​​, and ​​multi-layered safety​​, making it an efficient solution for confined-space handling. Below is a detailed analysis of its technical specifications and practical applications.     I. Structural Innovations for Spatial Adaptability​​   1.​​Low Headroom Technology​​   Traditional wire rope hoists require over 600 mm of vertical space for drum mechanisms. In contrast, electric chain hoists employ a ​​dual-trolley and motor integration design​​, reducing body height to 230 mm (for 2-ton models) and minimizing the hook-to-beam distance to 270 mm—saving 46% vertical space. For instance, in a warehouse mezzanine with 2.5 m ceiling height, it can lift a 1.8 m pallet to a 2.4 m shelf, whereas traditional equipment maxes out at 2.1 m due to headroom limitations.   2.​​Lightweight Body and Optimized Transmission​​   ​​Material Engineering​​: The housing uses ​​die-cast aluminum alloy​​ or high-tensile steel via thin-wall extrusion. A 1-ton model weighs only 45 kg, over 50% lighter than equivalent wire rope hoists. ​​Chain System​​: ​​Planetary...