What Is a Portal Crane?

Gantry crane is a variant of bridge crane, also called gantry crane. It is mainly used for loading and unloading of outdoor cargo yard, storage yard cargo and bulk cargo. Gantry cranes have the characteristics of high site utilization, large operating range, wide adaptability, and strong versatility. They have been widely used in port cargo yards.

Gantry crane (also known as

Gantry crane can be according to the structure of the door frame, according to the form of the main beam, according to the main beam

I. Model Standard

The gantry crane is characterized by four main elements, namely code, rated lifting weight, span, and working level.

Second, single girder gantry crane

Its symbols are: MDG, MDE, MDZ, MDN, MDP, MDS.

Such as: MDNSingle Girder Single Trolley Grab Hook Gantry Crane;

MDSThree-purpose portal crane with single main beam trolley.

Third, double beam gantry crane

Its symbols are: MG, ME, MZ, MC, MP, MS.

Such as: MGDouble beam single trolley hook gantry crane;

MEDouble beam double trolley hook gantry crane. ^[2]

National Standard of the People's Republic of China GB / T1440693 General Gantry Crane

1 Main content and scope of use

This standard specifies the general gantry crane classification, technical requirements, test methods and detection rules.

This standard applies to general-purpose gantry cranes (hereinafter referred to as cranes) operating in the open air. Its picking device is a hook, grab or electric suction cup (lifting electromagnet), or two or three of them can be used simultaneously.

The same and similar parts of the dedicated gantry crane can also be referred to.

2 Reference standards

GB 191 Packaging, storage and transportation icon

Technical specifications of GB 699 high-quality carbon structural steel

GB 700 carbon structural steel

GB 783 crane maximum lifting capacity series

GB 985 Basic form and dimensions of grooves for gas welding, manual arc welding and gas shielded welding

GB 986 Submerged arc welding seam groove basic form and size

GB 1102 round wire rope

GB 1348 ductile iron

GB 1591 low alloy structural steel

Radiographic quality classification of GB 3323 steel melt-welded butt joints

GB 3811 crane design code

GB 4628 Overhead Crane Cylindrical Wheel

GB 4942.2 Protection level for low-voltage electrical enclosures

GB 5905 crane test specifications and procedures

GB 5972 Practical Code for Inspection and Scrap of Wire Ropes for Lifting Machinery

GB 6164 crane buffer

GB 6333 electro-hydraulic block brake

GB 6334 DC electromagnet block brake

Classification and explanation of GB 6417 metal melting weld defects

GB 6974 crane terminology

GB 8918 high-quality steel wire rope

GB 8923 steel surface rust grade and derusting grade before painting

GB 9286 Paint and varnish paint film cross-section test

GB 10051 lifting hook

GB 10095 involute cylindrical gear accuracy

GB 10183 Bridge and gantry crane manufacturing and rail mounting tolerances

GB 11352 cast carbon steel parts for general engineering

GB / T14007 Technical conditions for driver's cab of general bridge and gantry cranes

ZBJ 19 010 Crane reducer

ZBJ 19 011 crane base reducer

ZBJ 80 006 Casting pulley for crane

ZBJ 80 007 Casting reel for crane

Technical conditions of ZBK 26 008 YZR series winding rotor three-phase asynchronous motors for winding and metallurgy

Technical conditions for ZBK 26 007 YZ series three-phase asynchronous motors for lifting and metallurgy

JB 1152 Ultrasonic inspection of butt welds of boilers and steel pressure vessels

JB 2299 Paint colors and safety signs for mining, engineering, lifting and transportation machinery products

JB 2759 General technical requirements for packaging of mechanical and electrical products

JB 4315 Crane electrical control equipment

3 categories

3.1 Types

3.1.1 According to the type of crane main beam structure, it is divided into single main beam gantry crane (see Figure 1) and double beam gantry crane (see Figure 2). . ^[2]

Before operation, according to the relevant national regulations, the following related procedures are required for the gantry filing:
Factory certificate, manufacturing company qualification certificate, installer operation certificate, start notice, self-inspection report. ^[2]

First, the selection of gantry crane

I. Lubrication

The working performance and life of various crane mechanisms depend largely on lubrication.

For lubrication, maintenance and lubrication of electromechanical products, please refer to the user's manual. Travelling trolleys, cranes, etc. should be injected once a week.

In April 2014, the world's largest 2,000-ton gantry crane built by Shanghai Zhenhua, Brazil's BrasFELS shipyard was officially put into use. The height of the gantry crane is 148 meters, which is equivalent to 45 storeys. It has a lifting tonnage of 2,000 tons and can successfully lift 1,400 family cars at one time. The height of the gantry crane and the lifting tonnage have set world records. In lifting assembly, the main beam lifting is the most difficult part of the whole process. The gantry crane's main beam lifting weight is about 4,000 tons. To lift the main beam to a height of 148 meters, the windward area is large and the risk is high. To ensure a smooth upgrade, the Zhenhua Heavy Industry Transportation Team arranged real-time monitoring of personnel at the 16 wind-sweeping points and skids at the scene, and established the overall coordination of the lift command. After two weeks of functional test and load test, the gantry crane obtained a license issued by the American Bureau of Shipping and performed well in the first hoisting mission. ^[4]

On June 8, 2015, the construction ceremony of Jiangnan Shipbuilding Group's 1600-ton gantry crane steel structure for Jiangnan Changxing Shipbuilding Base No. 4 was successfully held. The 1,600-ton gantry crane constructed this time was manufactured by Shanghai Zhenhua Heavy Industry. The gauge is 158 meters and the track length is about 1000 meters. The gantry crane operation area covers the entire shipyard and the assembly site. The project will use the patented double-up trolley scheme of Zhenhua Heavy Industries. The main beam adopts a single box beam type with a height of 95 meters below the main beam. The weight of the whole machine is about 10% lighter than similar domestic products. The project will adopt three large-scale shipping and shipyard dock port floating crane assembly solutions. This is after Zhenhua Heavy Industry's domestic shipyard in 2010 of 1600 tons and Brazil's Keppel Shipyard of 2000 tons of gantry cranes in 2012. ^[5]