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ASK

18
Dec
1, Install the driving device of moving system of the overhead crane on the cross girder. 2, Connect main girder and cross girder with high tension bolts referring to figure 2-a and figure 2-b. it should be guaranteed that shear shoulder on main girder connection plate should keep flat with horizontal plane of cross girder connection plate. To be o...
17
Dec
Operating environment, situation and usage frequency are usually considered as the condition of selection of rope of gantry cranes. In general, the rope should have excellent toughness. The linear contact lay wire rope can be selected firstly when the rope winds the sliding wheel and drum. And galvanized wire rope can be selected in the corrosive e...
16
Dec
LD electric single girder overhead crane (the following says crane) is a kind of light lifting equipment, used with CD1、MD1 and other electric hoists, lifting capacity 1-20t, span 7.5-22.5m, working environment -25℃~+40℃, humidity 84%. It works under the environment without fire, explosion and corrosive matters and it is prohibited to lift...
14
Dec
Moving speed for ground control of overhead crane has two kinds: 20m/min and 30m/min, CD1 model electric hoist moving speed: 20m/min and 30m/min, lifting speed 8m/min Electrical devices for CD1 model electric hoist include electric control box, control button and fire cutoff stopper. As operating the machine on the ground, the operator must firstly...
13
Dec
Some operators think that the replacement of parts of gantry crane is very easy, only need to replace the damaged parts. As a matter of fact, if assembly is not suitable, the power can decrease, the fuel consumption increase, and start hardly. And maybe the machine is damaged. So replacements of parts have rules. ZZHZ give their advice. 1. When buy...
12
Dec
ZZHZ(zzhz.com) has very rich experience of producing gantry cranes ; therefore, it can give us some advice to use the electric hoist: checking before use 1, There shouldnt have blocks on the road which the goods pass and the operator walks. 2, The action of the manual button should be flexible and motor and reducer should run without noise. 3, The...
11
Dec
Working condition 1: in the working condition with no wind, gantry crane does not move, trolley lifts rated loads at mid-span; Working condition 2: in the normal working condition, trolley lifts rated loads at mid-span, crane moving system brakes; Working condition 3: in the normal working condition, crane does not move, trolley lifts rated loads t...
10
Dec
In order to finish the girder lifting successfully, when using the crane to lifting box girder , we must adhere to the process flow,. ZZHZ has very rich installing experience , the matters need attentions are following: 1. when the gantry crane prepares to hoisting, the worker need to check the installation of each mechanism , parts and connection,...
09
Dec
The brake device plays a very important role in gantry crane s operation to make sure cranes can run correctly and safely. And the collocation of brake device can decide the working life and operating safety. So we choose the brake device from type, specification and environment etc. According to the products standard and actual requirement to make...
07
Dec
The launching gantry is the machine which erects the pre-cast concrete girder on the prefabricated piers. This invention has made a great contribution to the Chinese bridge construction field. As the development process of the high-speed railway projects in China speeds up gradually, the launching gantry will play a more important role in the follo...
06
Dec
After knowing the working principle of electric hoist of gantry crane , the maintenance of electric hoist is an important content we must know. 1. At least 4 times maintenance every year, for example, cleaning parts by diesel oil and the lubricating using calcium-based grease. 2. After finishing work every time, at first wiping the mud, dust or oil...
05
Dec
The whole overhead crane is made up of two end girders ,two main girders ,trolley and crane assembly; 1、After the crane is carried to construction site, firstly, installing the bridge frame, and then main girder and end girder are connected together, and finally installing the handrail and accessories. 2、After the bridge frame is installed comp...
04
Dec
MG series gantry cranes are patent products specially designed for bridge construction. Because bridge constructions are characteristic of little work batch, large weight, short power supply and frequent worksite changing, combined with advantages of existing machines at home and abroad, ZZHZ designs gantry cranes featuring simple structure, conven...
03
Dec
Because of the structure and special requirements of road when walking, the bridge girder launcher for tunnel must be separated when carried. a. Accessories must be put into box regularly, and quick-parts are packed individually and the box is filled in the barrier; and the mounting surface of mechanism should be treated with a preservative and the...
02
Dec
After the bridge girder launcher finishes the girder erection which maybe transferred to another site. Because the huge parts, and long distance between two sites, the machine needs to be disassembled and then transported to the destination, the following safe rules when disassembled: 1. After the erecting girder, paving the rails, the bridge girde...
30
Nov
(1)Cut off the power before test run of gantry crane , check all of the following parts: a. All parts assembly should conform to the requirements of drawings. b、To refuel the lubrication point. c、Steel rope and drum should be fixed reliably, and displacement restrictor should be flexible. d、All the steel structure shouldnt become deformed...
29
Nov
The gantry crane rail installation is a field between the mechanical and civil engineering construction projects. The crane rail installation will have a direct impact on the quality of crane operation. The crane rail produced by ZZHZ (Zhengzhou Huazhong Construction Machinery Co.,Ltd) is based on the customers requirements. Also its installation i...
28
Nov
ZZHZ mainly produces construction machinery and hoisting machinery, such as gantry crane , bridge girder launcher ect. So ZZHZ can give some advice to us. According to Special Equipment Safety Monitor Terms and the relevant provisions: In the installation process of special equipment to the construction site before the host city and Technical Super...
27
Nov
1、Application range and use of bridge girder launcher : It is mainly used for lifting of concrete girder in bridge construction of general railway and highway. 2、Main features and advantages of product: After researching and analyzing current highway bridge construction machine at home and abroad, combining with our successful experience, we de...
26
Nov
1, The overhead crane must be in normal status, especially the safety devices. Hang the signs of the rated lifting capacity on the visible position. 2, In the working condition, prohibit transporting the people with the crane or the hook. 3, Forbid operating the crane without the license and drink driving. 4, In the operation process, concentrating...