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christopher2021
Angemeldet seit:
01.07.2021
Beiträge: 5802
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Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the ***** and the factors that lead to instability.
Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the types of cranes and the factors that lead to instability.
1. Types of cranes:
1. Light lifting equipment
Electric hoist, hand chain hoist, electric chain hoist, emblem type hoist, etc., with light and compact structure, light weight, small size, and strong versatility of parts.
Bridge crane: It is the most commonly used. It is erected on the track of the fixed strut between the buildings and used in workshops, warehouses, etc. Do loading, unloading, lifting and handling work indoors or in the open air. In the factory, it is generally referred to as a driving vehicle.
(1). Divided by structure: such as single-beam bridge, double-beam bridge, multi-beam bridge, double trolley bridge, multiple trolley bridge, etc.
(2). According to the picking device: such as hook bridge crane, grab bridge crane, electromagnetic bridge crane, container bridge crane, etc.
(3). Divided by purpose: such as general-purpose bridge cranes, metallurgical bridge cranes, explosion-proof bridge cranes and so on.
2. Gantry crane
Gantry crane is a kind of bridge crane, also called Longchuan crane. Mainly used for outdoor cargo yard, stock yard cargo, bulk cargo loading and unloading operations. Its metal structure is like a door-shaped frame. Two supporting legs are installed under the main beam to walk directly on the track on the ground. Both ends of the main beam can be provided with outhanging cantilever beams.
(1). According to the structure: single main beam gantry crane, double main beam gantry crane, box or truss gantry crane
(2). Divided by cantilever: single cantilever gantry crane, double cantilever, non-cantilever gantry crane, etc.
(3). According to the support mode: rail-mounted gantry crane, tire-type gantry crane.
(4). According to the picking device: hook gantry crane, grab gantry crane, electromagnetic gantry crane, etc.
(5). According to the occasion of use: general gantry cranes, shipbuilding gantry cranes, hydropower station gantry cranes, etc.
(6). According to the lifting trolley: self-propelled trolley gantry crane, traction trolley gantry crane, chain hoist gantry crane, etc.
3. Boom type crane
(1). Operating boom-type rotating cranes, including: portal cranes, floating cranes, tower cranes, automobile and tire cranes, crawler cranes, and railway cranes.
(2), fixed jib cranes, including: cantilever cranes, mast cranes, and jib cranes.
Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the types of cranes and the factors that lead to instability.
2. Factors leading to instability of hoisting machinery:
1. Crane instability
Main factors: overload, unstable outriggers, mechanical failure, excessive mast pain, etc.
Solution: prohibit overloading, strict mechanical inspection, lay the outriggers and fix them with road wood and steel plate to keep the outriggers stable.
2. The instability of the hoisting system
Main factors: unsynchronized multi-machine hoisting; improper load distribution of multi-machine hoisting with different lifting capabilities; multi-action, multi-position command and harmonious error, mast system wind rope and ground anchor instability.
Solution: When multi-machine hoisting, try to choose cranes of the same model and the same or similar hoisting capabilities, and complete the synchronization of multi-machine hoisting through the main and deputy commanders; cluster jacks or winches are controlled by the computer to complete the synchronization of multiple hoisting points; Good command and operating procedures and drills, try to be consistent; wind ropes and ground anchors are set up strictly in accordance with the hoisting plan and technical calculations. After the settings are completed, check and record them.
3. Instability of hoisting equipment or components
Main factors: because of the different forces during planning and hoisting, the rigidity of the equipment or components is too small.
Solution: Choose multiple lifting points for slender, large-area equipment or components; fix or increase the cross-section of the thin parts or rods of section steel components and grid structures.
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