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16
Apr
Gantry crane with large span is inclined to move at a skew with bad balance, so a deviation rectification system is needed to monitor and correct the movement of gantry crane. Optical-electricity encoders shall be respectively installed at two sides of crane moving mechanism to check their relative travel limit, as moving deviation is among 1~3 s...
15
Apr
Crane hook surface check is routine work for crane operators everyday, below requirements shall be met: 1. Pulley shall rotate flexibly on the shaft without obvious looseness; 2. The pulley rim shall have no damage or crack, or it shall be changed; 3. Mousing-hook device shall open and close freely, the spring shall be in good condition to avoid st...
14
Apr
Honeycomb girder launching gantry developed by ZZHZ is a new type bridge construction crane in crane fields. It is unique and practical. The main girder of the launching gantry is honeycomb girder. For honeycomb girder, it means many hexagonal holes which looks like honeycombs in the main girder, with which the air current could pass through the ho...
12
Apr
Heavy duty electric overhead travelling crane in steel plant demands a high working level and perfect quality. It is made up of trolley, bridge girder, end carriage, operators cabin, crane moving system and electrical system. Below are simple introductions on one of its parts: end carriage. End carriage shall be fabricated from rolled steel section...
11
Apr
Earthing system creates conditions for normal operation of gantry crane and personal safety, thus avoiding electric shock and other danger. A ring earthing system shall be provided on the gantry crane. Each and every electrical equipment shall be connected to this earthing at least at two points. It shall conform to general specification for earthi...
10
Apr
High speed reduction shall be through helical gears. All pinions shall be integral with the shaft. All gears shall be of hardened and tempered alloy or carbon steel with machine cut teeth. Gear teeth shall be preferably be cut in metric module system. Surface hardening of teeth is not permissible. Overhung gears shall not be used. All gears shall b...
09
Apr
1. Regularly check whether the bridge girder launcher travel switch and hammer switch are safe and reliable, whether limit stop block can be in reliable collision....
08
Apr
Support legs are important parts to ensure the gantry crane to move smoothly, good welding technology will provide support legs with good performance. 1. Assemble rib plate of gantry crane and corresponding plug welding base plate, then weld them as rib plate assembling unit; 2. Lift cover plate on the platform, mark position line of rib plate and...
07
Apr
1. Balanced cantilever method. It uses movable suspended scaffolding (hanging basket) to pour concrete symmetrically from two ends to the middle span at the same time and impose pre-stressing force. It demands balanced temporary loads at both ends, construction at the same time and concreting at the same time. 2. Cast-in-situ concrete method. It ma...
07
Apr
1. Balanced cantilever method. It uses movable suspended scaffolding (hanging basket) to pour concrete symmetrically from two ends to the middle span at the same time and impose pre-stressing force. It demands balanced temporary loads at both ends, construction at the same time and concreting at the same time. 2. Cast-in-situ concrete method. It ma...
04
Apr
Rail Mounted Container Gantry Crane is usually used in container terminal with strong wind force, so some wind resistance measures shall be taken to avoid accidents. Before strong wind comes, drive the gantry crane to the terminal end, connect left support leg with U-steel on the embedded bars of box girder. Two sides of main girder and support leg...
02
Apr
Gantry crane resistor is mainly used to adjust rotational speed and reduce starting current of motor. Thermal problem shall be paid more attention to for long time use of crane resistor, which is key factor to decide whether it can move safely. Generally, it must be immediately observed whether crane resistor will be in overheating condition as we...
01
Apr
a. Electrical safety device of gantry crane General power switch earth leakage protection device Crane travelling emergency stop button Crane travelling warning light Lifting travel limit(max), crane travel limit and trolley travel limit Lifting load limiter Anemoclinograph Lifting trolley travel locking device Crane stop rail clamping device b...
31
Mar
The following maintenance measures made by ZZHZ are for your reference: 1. Regularly check fastening parts. It refers to bolts, nuts, adjusting bolts and others which will cause an accident if they become flexible; 2. Ensure enough oil, water and air for the sake of normal operation and long service life of motor; 3. Ensure clean oil, water, air an...
25
Mar
The bridge building crane for high speed railway uses full span method to construct bridge with span 20m,24m and 32m, whole span girder weight 450t-900t, it is specially designed and made by ZZHZ. Full span method means that girder carrier carries one whole span prefabricated box girder to the rear part of crane, then the bridge building crane lift...
21
Mar
Safety slide contact wire features safe, reliable and perfect mechanical electrical performance, quite convenient for installation and maintenance. Check the gantry crane safety slide contact wire before installing it, coat antirust paint for non-friction conductive surface, 15-20mm expansion joint shall be kept at joints of two slide contact wires...
20
Mar
Crane resistor is mainly used to adjust rotational speed and reduce starting current of motor. Thermal problem shall be paid more attention to for long time use of crane resistor, which is key factor to decide whether it can move safely. Generally, it must be immediately observed whether crane resistor will be in overheating condition as we use it....
19
Mar
Overhead crane span structure moves along the overhead rail track, anti-collision device is one necessary safety device for overhead crane. Anti-collision device of overhead crane is mainly made up of: 1. Distance detection controller Its main function is to deal with signals received by laser sensor and then to correspond relevant motions of alarm...
17
Mar
Moving gear plays an important part in normal operating of crane, some basic lubrication steps shall be taken to keep it in normal working condition. Open reducer vent cap as using the moving gear at the first time to ensure good ventilation and reduce internal pressure. Check whether height of reducer lubricating oil level reaches the demand befor...
15
Mar
The steel structure is the basic component which is made up of connecting the steel plate and section steel, such as beam, pillar and truss. After delivering to the construction site, to join and install it accomplish the overall steel structure. The joining procedure plays an important role in the steel structure which will directly impact the ins...