overhead crane inspection and maintenance of six months

1 ) Check all gear reducer and wear, pitting damage to the Overhead bridge crane tooth surface should not exceed 30% of the engagement surface and a depth of not more than 10% of the original thickness of the tooth (fixed chord tooth thickness ) ; wear of gear tooth thickness percentage of the original tooth thickness does not exceed 15% to 25% ; checks bearing the state ; replace oil .
2 ) Check the large and small wheels condition, lubricate the wheel bearings to eliminate the phenomenon of gnawing track .
3 ) Check the main Bridge gantry crane beam, the beam end whether to open the main seam welding, corrosion phenomena , rust should not exceed 10 % of the original thickness of the main force components whether fatigue cracks ; various rails , brackets are intact ; inspection girder, end beam and tighten the bolt again .
4 ) Check the main beam deformation . Check rail trolley case . Under no-load main beam interference should not exceed their span of 1/ 2000 ; beside the main beam bent inwards level shall not exceed 1 /1500 to measure length ; trolley rail track should produce the phenomenon , the top surface and side rail wear ( sided ) volume must not exceed 3mm.
5 ) Check the KS Crane Group reel , the reel wall wear should not exceed 20 % of the original thickness of the rope groove convex peak does not strain sharp .
6 ) All bolts and tighten the fastening bolts on the crane .

bridge gantry crane girder structure according to the classification by primary forms

1 single girder gantry crane
Single Bridge gantry crane cantilever structure is simple, easy to manufacture and installation, small own quality, main beam, mostly off-track box-shaped frame structure. Compared with the double girder gantry crane, the overall stiffness of the weaker. Therefore, when the starting weight Q ≤ 50t, when the span S ≤ 35m, can use this form. Single girder cranes door main gate leg has L and C forms. Facilitate the manufacture and installation of L-type, the forces better, the smaller their quality, but the leg lifting cargo through space at a relatively small number. C-leg formed inclined or curved shape, the purpose is to have a large lateral space for the goods pass feet.
2 double girder bridge crane
Double girder gantry crane carrying capacity, span, good overall stability, variety, but the quality of their starting weight compared with the same single-girder gantry crane to be bigger, the cost is higher. Depending on the structure of the main beam, can be divided into two box girders and trusses form. It is generally use more box-shaped structure.

Bridge crane

Bridge crane bridge is a bridge crane runs on an elevated track , also known as the crane . bridge crane bridge laying along the elevated tracks on both sides of the longitudinal running , lifting trolley along the track laid on the bridge sideways , forming a rectangular scope of work , you can take advantage of the space under the bridge lifting materials , not hampered by ground equipment .
Bridge gantry crane is widely used in indoor and outdoor warehouses, factories , docks and open storage yard , etc. . Bridge crane bridge crane can be divided into ordinary , simple beam bridge crane bridge crane and metallurgical dedicated three.
General overhead cranes generally lifting trolley , bridge run institutions , bridge metal structures. Lifting trolley and hoisting mechanism consists of the trolley run institutions and small frame of three parts.
Lifting mechanism includes a motor , brake , reducer, drum and pulley . Motor through reducer, driven reel rotation, so the rope from around the reel or roll down to lift heavy objects . Small frame is the bracket and install the hoisting mechanism and operating agencies and other parts of the car chassis , usually welded structures .

Bridge crane

When the load on the main girder span camber should be F = LK1000 (0.9 ~ 1.4) (wherein LK-based beam span), but the crane in use, often due to overload, thermal radiation and repair bridge gantry crane irrational factors such as main beam camber disappear. From a city crane factory to investigate the plant manufactured products tested 106 quay cranes situation, the result is the use of the arch disappeared after 1 year, 2-5 years 20% of the arch disappeared 30% to 50%. use 5-10 years more than 60% on the arch disappeared almost entirely disappeared more than 10 years, and produce under torsion, seriously affecting the safety in production. Disappearance of the main beam camber is essentially metal structure deformation. This will cause a malfunction size car run institutions, resulting in wheel overhead gantry crane size skew span error increases, which will affect the smooth operation of the trolley car safety gauge changes, the size of the car, "bite the Road" serious phenomenon. Main beam deflection will produce severe lower level next bend plate waves increases.

Overhead crane parameter identification based on energy conservation

Two degrees of freedom of the bridge crane , due to the driving characteristics of a system input that transport overhead gantry crane the crane swing accompanied the load, which increases the difficulty to accurately position the load handling control . Around the bridge crane anti- sway control launched a lot of research . Presents a hierarchical sliding mode control method , the system state is divided into two groups were constructed sliding plane, control the amount of each sub- sliding surface contains the equivalent control component so as to ensure the system state of each sub- sliding along the slip plane . The establishment of a fuzzy control system, four-input single-output fuzzy controller is optimized for two pairs of input single-output fuzzy controller and a weighted composite of the two outputs. Prediction and compensation based on disturbance eot crane feedforward and feedback controller is designed to effectively eliminate the influence of nonlinear friction of the cable car system. However, numerous studies including the above literature , including both known to stay in the assumed model simulation stage , and no model parameter identification in-depth study . Mathematical models for controller design overhead crane is very important , so the controller based on a simple model structure obtained applications. Common method of system identification of an energy law and CAD models. Accuracy of the components illustrated AutoCAD CAD model method relies on the system , the process can not be accurate.

The main components gantry crane

The main components gantry crane: According to industry standards GB/T14406 requirements, gantry crane overhead gantry crane mainly consists of the following components

A cylindrical wheel

2, buffer

3, block brake

4, rope

5, lifting bridge gantry crane hook

6 cab

7, reducer

8, casting pulley

9, casting reels

10, the motor

11, electronic control equipment

Shipbuilding gantry crane safety monitoring and management system

With the development of society, economic prosperity, port handling equipment is toward automation, high-speed, large-scale and heavy in the direction of development in order to improve the efficiency of port handling operations. In order to ensure safety in Steel crane production , reduce the incidence of accidents , the safety of large lifting machinery monitoring and management is imperative. State Administration of Work Safety , AQSIQ also in 2011 began requiring the progressive realization of the installation of security monitoring and management systems on large lifting machinery, especially the first pilot asked for shipbuilding gantry crane , and clearly the 2014 shipbuilding gantry crane compulsory installation of safety monitoring and management system . System functional requirements in order to achieve effective management of shipbuilding gantry crane and effectively monitor hoist gantry crane the health of the security situation , the functional safety monitoring and management system must meet the following requirements ( 1 ) shall be monitored directly related to the crane usage may lead to security incidents crane operation parameters, including lifting , lifting height , each trolley trip, carts run deflection, wind speed, the same or a different orbit from the security agencies , operating instructions, working hours and total working hours, work cycle and accumulated work cycle. ( 2 ) should be able to easily monitor the status of security incidents resulting in work organization and work equipment, including hoisting mechanism brake status .