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Difference Between Chain Hoists and Wire Rope Hoists

Currently, there are two main types of electric hoists widely used on the market: electric chain hoists and electric wire rope hoists. Based on different working conditions, you can choose a suitable electric hoist. This article briefly introduces the difference between electric chain hoists and wire rope hoists for reference. Hoist Size When comparing electric hoists of the same tonnage, chain hoists are generally smaller than wire rope hoists. This is due to their different construction. Electric chain hoists are chain-driven, and the chain box is separate from the chain hoist, overcoming the problem of oversized reels on wire rope hoists. As a result, the dimensions of electric chain hoists are mostly smaller than those of wire rope hoists. The size difference becomes more significant as the lifting height increases because the wire rope is wrapped around the drum, which has a greater effect on the overall size. Lifting Height There is excessive pressure on one side of the drum and tension on the corresponding surface. The smaller the diameter of the drum, the greater the deformation of the wire rope, and the greater the pressure and tension on the corresponding surfaces. To avoid the wire rope wrapped around the...

Crane Rail Introduction

Crane rail (also known as crane track) is a specialized rail system designed to provide a running path for cranes (such as overhead cranes, gantry cranes, etc.), ensuring that cranes can move smoothly and safely. Below is an introduction to the QU series of crane rail. QU Series Crane Rail Standard System Chinese standard: GB/T 11264-2012 (replacing the old YB/T 5055) International benchmarking: ISO 1834:2018, ISO 6303:1980 European standard: DIN 536 (Series A) American Standard: ASCE/AAR Standard Objective: JIS E1101 (CR series) International Standard Comparison of QU Crane Rail China Europe United States Japan QU70 A65 ASCE25 CR60 QU100 A100 ASCE60 CR80 QU120 A120 ASCE85 CR100 Comparison of QU Model Crane Rail Parameters Model Section dimensions (mm) Theoretical weight (kg/m) Applicable lifting capacity （ton） Head width (mm) Waist thickness (mm) QU70 70*70 33.3 Less or equal 10t 50 25 QU80 80*80 43.5 10-20t 60 28 QU100 100*100 68.2 20-50t 70 32 QU120 120*120 98.3 50-100t 80 38 Part of QU Crane Rail Drawings Key Structural Features of QU Crane Rail Head Design: Large-radius arc transition, reducing rim wear Waist reinforcement: Thickened cross-section design, bending modulus increased by 30%+ Bottom optimization: Wide-bottom structure, better installation stability Material Technical Requirements of QU Crane...

Installation and Usage Manual for Portable Gantry Crane

Portable gantry cranes (commonly known as “gantry cranes”) are mainly used in open-air sites, warehouses, or temporary construction sites. During installation, safety regulations must be strictly followed to ensure structural stability and operational reliability. The following are the key installation steps and precautions. Preparations before the Installation of the portable gantry crane 1. Site inspection Confirm that the ground is level and compacted. The bearing capacity should meet the sum of the self-weight of the portable gantry crane and the maximum load (generally, the bearing capacity of the foundation should be ≥10t/m²). 2. Equipment acceptance Check that the main beam, outriggers, electric hoists, and other components have no deformation, rust, or welding defects. Check whether the electrical components (motors, limit switches, cables) meet the dust and water resistance grade (such as IP54). 3. Tools and personnel Prepare tools such as a crane (or forklift), a level, a torque wrench, and a theodolite. Installers must be certified to work (such as the qualification certificate for hoisting machinery installation). Portable gantry crane installation steps and key control points 1. The outriggers are installed with the lower crossbeam Leg verticality: Calibrated with a theodolite, with a deviation of ≤1/1000 (for example, the allowable...

Why is 48V better for crane control voltage?

The crane control voltage refers to the voltage level used to operate the crane’s electrical control system (such as contactors, relays, PLCS, control buttons, limit switches, etc.). Its selection must comply with safety standards, equipment reliability, and the requirements of the applicable environment. According to the provisions of the Chinese crane national standards, the control voltage of cranes includes general control voltage, DC control voltage, and power supply voltage for intelligent components. Generally, 24V, 36V, and 48V are the commonly used crane control voltages. Suppose the crane is equipped with a frequency converter. In that case, special attention should also be paid, as the frequency converter mostly adopts a three-phase AC power supply voltage with a higher safety level, and the intelligent control voltage inside the machine is usually a 48V DC voltage. The stability of the crane control voltage is also important, especially in the troubleshooting of the crane. Any sudden changes need to be immediately investigated for their causes. The commonly used fluctuation range is limited to ± 10%. For instance, the fluctuation range of a 48V control voltage is between 43.2V and 52.8V. Crane control voltages exceeding this fluctuation range may affect the abnormal operation of the...

Gantry Cranes for Engineering

Engineering gantry crane introduction The MG type engineering gantry crane is engineered for bridge erection and road & bridge construction. It specializes in lifting various materials and precast beams. Key features include: Dual-Mode Operation: Can work in pairs for lifting heavy precast beams (each gantry crane with 80 ton capacity) or single-unit with dual hoists (160 ton capacity). Robust Structure: Composed of assembled main girders, supporting legs, and winches, connected by pins and high-strength bolts for easy installation, disassembly, and transportation. Mobility: Ideal for construction units with frequent site transfers due to its modular design. Engineering gantry crane function & application Primary Tasks Transfer precast beams from casting beds to storage yards. Lift the beams from storage to transport vehicles after they have cured. Additional Functions Assist in assembling and disassembling bridge erecting machines. Erect low-height dry bridges. Application Scope Bridge Construction: Precast beam handling in manufacturing yards, railway/road bridge erection, subway projects, and viaduct construction. General Lifting: Suitable for other heavy-duty lifting tasks in construction sites. Engineering gantry crane specification Model MG Lifting Capacity ton 20 to 200 Lifting Height meter 8 to 50 Span meter 25 to 45 Working Class A3/M3, A5/M5, A6/M6 Crane Speed m/min 8 Lifting Speed m/min 1.5...

Metallurgical Crane – Overhead Crane for Steel Mill

A metallurgical crane is a specialized overhead crane designed for handling molten metals in environments such as foundries, steel mills, and metallurgical plants. They are categorized into single-girder and double-girder configurations. According to Section 5 of the Crane Design Standards (Overhead and Gantry Cranes), metallurgical cranes must meet all the requirements of standard overhead cranes, plus additional critical specifications to ensure safety and reliability in extreme conditions, as below. Heat radiation protection & fireproof plates For overhead cranes handling molten metals or hot materials, a heat radiation protection plate shall be installed at the bottom of the operator’s cabin, which is exposed to direct heat radiation. Overhead cranes handling molten metals or hot materials (excluding those using the lower flange as a runway) shall have heat radiation protection devices installed at the bottom of the main girder and lifting beam. For overhead cranes using the lower flange as a runway to handle molten metals or hot materials, a heat radiation protection device shall be installed under the lifting trolley. Heat radiation plates shall be secured with anti-falling mechanisms. Overhead cranes exposed to direct flames (e.g., charging cranes in steel mills) shall have fireproof plates installed on main structural components in...