Bridge crane inspection and maintenance system - inspection and lubrication

3 half Inspection and Maintenance
    Maintenance and inspection once every six months, including the month in addition to checking the content outside there should be:
    1) Check that all the gear reducer and wear,overhead bridge crane pitting damage to the tooth surface should not exceed 30% of the engagement surface and a depth of not more than 10% of the original thickness of the teeth (tooth thickness fixed chord); wear of the tooth thickness the percentage of the original tooth thickness does not exceed 15% to 25%; Check bearing condition; replace oil.
    2) check whether large, small wheel condition, the wheel bearings lubricated track to eliminate the phenomenon of eating.
    3) Check the main girder, end beam welds have to open the main welding, corrosion phenomena, rust should not exceed 10% of the original thickness of the principal stress 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 the trolley track situation. Main beam interference under no load should not exceed the span 1/2000; girders bent inwards next level measured length shall not exceed 1/1500; trolley rail track should not produce the phenomenon,sino hoist rail top face and flank wear ( sided) volume must not exceed 3mm.
    5) Check the reel case, reel wall wear should not exceed 20% of the original wall, rope groove hump does not strain the tip.
    6) Tighten all bolts on the crane and fastening bolts.
    4 crane lubrication
    Lubrication is to ensure the normal operation of the machine, to extend the life of parts, improve efficiency and safety of the important measures. Maintenance personnel should fully understand the importance of lubrication equipment, always check the lubrication of all moving points, and regularly add oil to each lubrication points (grease).
    4.1 Dan river bridge machine main power plant lubrication
    ① bridge machine winch; ② kinds of bearings; ③ each gear couplings; ④ reducer; ⑤ rope; ⑥ hinge point on the brake.
    4.2 Lubrication Precautions
    1) maintain the lubricant (grease) clean;
    2) different grades of lubricating oil (fat) should not be mixed;
    3) selection of a suitable lubricant (grease) at the stipulated time for lubrication;
    4) using pressure greasing France (grease gun or pump, screw-type oil cup) add grease, so you can put grease pushed the friction surface to prevent his hand when not enter the friction surface;
    5) wet areas should not use sodium based grease, because of its hydrophilic, easy to lapse;
    6) The agency did not oiling point rotating parts, should be regularly rotated with dilute oiler in the gap,overhead gantry crane in order to reduce mechanical friction and prevent corrosion.

Bridge crane inspection and maintenance system - weekly inspection and monthly inspection

     bridge gantry crane  components as more different techniques for the various components of the features, we will be maintained in the actual work, inspection cycle is divided into weeks, months, years, each cycle including the following:
    1 weekly inspection and maintenance
    Maintenance and inspection once a week, inspection and maintenance as follows:
    1) Check the brakes on the nuts, cotter pins, positioning plates are complete, loose, levers and springs without cracks, pin on the brake wheel bolts and washers are loose cushion, complete; brakes are reliable braking. Brake release opening of the brake pads should be less than 1.0mm, and the distance of the gap on both sides of the brake drum should be equal, the pivot pin may have stuck.
    2) Check the safety switch and limit switch is accurate, flexible and reliable work, especially the increase in the limit is reliable.
    3) Check the wire rope on the drum and pulley wound is normal, without off-tank, channeling, knotted, twisted and other phenomena, wire rope clamp bolts are tightened, whether there is double nut locking devices.
    4) Check the hoisting mechanism coupling closures fastening screw is loose, the shortage.
    5) Check the transmission mechanism is normal,overhead bridge crane with or without abnormal noise.
    6) Check all lubrication lubrication condition is good.
    7) Check the track if there is a foreign body obstruction bridge machine is running.
    (2) Monthly inspection and maintenance
    Once monthly maintenance and inspection, inspection and maintenance, we cover every week to the contents include:
    1) Check the brake pad wear pads should not exceed 2mm, wheel and brake pad contact area shall not be less than 70%; checks the status of each mounting pin and wear and lubrication conditions, the amount of wear of the pin should not exceed 5% of the original diameter of the small axis and the amount of wear of the mandrel should not exceed 5% of the original diameter and ovality than 0.5mm.
    2) Check the wire rope for wear, if there is broken wire and so on, check the wire rope lubrication conditions.
    3) Check the hook for cracks, wear and tear of its dangerous section does not exceed 5% of the original thickness; hook nut locking device is complete, set the hook on the various parts are complete and reliable. Hook should rotate flexible, non-jamming phenomenon.
    4) Check that all bolts are loose and shortages.
    5) Check the motor, reducer bolts fastening the base and individually fastened.
    6) Check the gearbox lubrication conditions, the oil level should be within the specified range, measures should be taken against oil leakage sites prevent leakage.
    7) of the gears.
    8) Check the balance at the rope pulleys for wear on pulleys and pulley shaft lubrication.
    9) Check the pulley position, to see whether it flexible, without damage, cracks, particular attention to the wear of the fixed pulley shaft.
    10) Check the brake wheel, uneven surface of its work should not exceed 1.5mm, brake wheel should not have cracks, its radial runout should be less than 0.3mm.
    11) Check the coupling, which should not be on the key and keyway damage, loose; two coupling between the drive shaft axial string momentum should be 2 ~ 7mm.
    12) Check the size of the vehicle operating conditions, should not have gnawing rails, three fulcrum, when the pendulum starts and stops and so on. Check the wheel rim and the tread wear, the wear of the rim thickness should not exceed 50% of the original thickness, wheel tread wear should not exceed 3% of the diameter of the wheel of the original.
    13) Check the cart track conditions,overhead gantry crane to see whether the bolts loose, shortages, pressure plate is fixed on the track, rail cracks and fracture; two tracks whether the gap joints 1 ~ 2mm (summer) or 3 ~ 5mm ( winter), the joint down, left dislocation is more than 1mm.
    14) for the crane to conduct a comprehensive clean, clear on dirt.

Crane drivers work safety supervision

One: the safe operation of the  steel crane  driver checks
    (1) Lifting equipment shall be held operating permit personnel to operate, operation, energy should be concentrated;
    (2) conduct a class before work load test, check all parts for defects, safety devices are sensitive;
    (3) crane operation, should be the first Ming signal to prohibit human head hanging objects from passing;
    (4) close to the rated load lifting weights, you should take a test hanging, that is not too high from the ground, in the air landing time to check the brake mechanism is feasible;
    (5) when the crane failure, the driver shall stop work immediately, disconnect the power. If there is heavy lifting, you should send signals, and set aside the danger zone, if the parking time is longer, you should try to put down or hanging objects paving, reporting leadership or associated personnel overhaul, repaired after the test to confirm intact rear can work;
    (6) the work must comply with "Ten is not hanging", that command signal or persons unknown command help,bridge gantry crane over load is not suspended, the work is not binding is not strong hanging, hanging things people do not hang on the station, safety devices, failure is not hanging, object buried in the ground without lifting, poor lighting does not hang, no hanging hanging oblique oblique, sharp objects at the pad soft material does not hang, objects, people do not hang down;
    (7) when lifting heavy objects fall to the lowest position, the roll of wire stored on not less than twice;
    (8) When used in the Cable Car parking not allowed to hang weights. Only after removing the weight and hook rose appropriate height, control handle stops at zero, then cut off the power supply is disabled.
    Two. The crane drivers are familiar with the operating environment of the inspection
    As a crane driver, in addition to master the safe operation, maintenance and other aspects of knowledge, but also familiar with its operating environment in order to prevent personal injury or equipment damage accidents.
(A) the characteristics and ground operations personnel activity patterns;
    (2) the characteristics of normal lifting goods;
    (3) the characteristics of the production process;
    (4) characteristics of the environment. Some workplace noise, the driver can not be found in a variety of cranes is not normal sound,hoist gantry crane especially commanding sound signals and mechanical noise intertwined, drivers tend to make misleading or judgment is unclear. Others such as dust concentration of the environment, high temperature environment, the environment of corrosive gas and more, will give the crane operation and operation to bring the corresponding problem.

Cranes equipped with safety devices which

To ensure safe and reliable lifting operations,  bridge gantry crane  equipped with a better safety devices in order to unexpected circumstances, play a protective parts or alert the operator, and thus play a security role.
  A hydraulic system, the pressure relief valve: inhibit loop abnormally high pressure in order to prevent damage to the hydraulic pumps and motors, and to prevent is overloaded.
  2 luffing jib safety device: When the unexpected accident, boom luffing cylinder loop pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from work oil, the boom will not fall, thereby ensuring the safety of operation.
  3 telescopic crane safety device: When unexpected accidents, telescopic boom cylinder circuit of the high-pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil, the suspension will retract themselves,hoist gantry crane thus ensuring the safety of operation.
  4 height limit device: hook up the required height to rise after touching limit hammer, turn the trip switch, "over round" indicator light that is bright, while cutting off the hook lifting, boom stretched out, hanging Arm volts to the operation of such action to ensure safety. Then just manipulate the hook down, boom boom retracted or looked up (to the Security side operation), etc. handle, lift the weight limit constraint, the operation returns to normal. For special occasions, such as still need to make a small amount of over-winding operation, press the release button on the meter box, this time limit will be lifted role, but this time the operation must be very careful to prevent accidents.
  5 leg locking device: When unexpected accident occurred, leading to the leg vertical cylinder hoses or tubing rupture or cutting, the hydraulic system can be disabled with a two-way hydraulic lock cylinder two leg blocking pressure oil chamber, the branch Notations or throw the legs, thereby ensuring the safety of the lifting operation.
  6 from the weight indicator: Starting weight indicator is set in the basic arm together side (ie, the right side of the cab), the operator sitting in the control room can be clearly observed, can accurately indicate the boom elevation and the corresponding conditions allow cranes rated capacity.
  7 Lifting Characteristics Table:sino hoist Set in the control room on the front side of the lower wall, the table lists the various arm lengths and a variety of work rate and the nominal weight lifting height for operation inspection. Lifting operation, must not exceed the values ​​specified in the table.

Lifting Basics

Lifting machinery, is used for vertical lifting or moving heavy objects vertically and horizontally electromechanical devices. The range is specified at rated capacity greater than or equal to 0.5t lift, rated capacity greater than or equal to 1t, and lift height is greater than or equal to 2m,  steel crane   and load-bearing fixed in the form of electric hoist.
2. Lifting work characteristics
(1) Lifting typically have more complex structures and large institutions, to complete a lifting movement, once or several times horizontally.
(2) a variety of weight lifting, the load is changing.
(3) Most of lifting machinery, you need to operate within the larger context, activities, larger space.
(4) some lifting, carrying personnel require direct rail, platform or rope to do lifting movement (such as elevators,overhead bridge crane lifting platforms, etc.), which directly affects the reliability safety.
(5) exposed, moving parts are more often associated with lifting operations and personnel in direct contact (eg hook, wire rope, etc.), a potential risk factor for many sporadic.
(6) operating environment is complex.
(7) the job often requires people, together, in a single operation.
The existence of many of the above risk factors, determines the lifting injury accident-prone.
3 crane safety working conditions
In order to ensure the safety of the crane work,hoist gantry crane crane design should meet the following three basic conditions.
(1) The metal structure and mechanical parts should have sufficient strength, rigidity and resistance to buckling.
(2) the machine must have the necessary stability against overturning.
(3) having a prime mover power to meet the performance requirements of the job, brakes provide the necessary braking torque.

Growth Variation Manqu

2012 perhaps destined to be a bumpy journey  overhead bridge crane  industry began.
Right now, the U.S. economy is still a lot of uncertainty, and dragged down by the debt crisis, the European economy is still sluggish. But for the majority of the world emerging economies, infrastructure need to be improved, still continuing to promote. Correspondingly, the vast majority crane manufacturer since 2011 in the fast-growing world-wide reboot, even beyond the 2008 hit a record high.

In fact, this year's global mobile cranes 10 companies total sales to $ 13.021 billion, a figure from the previous year to achieve a 15.37% growth. This is since the financial crisis of its total sales for the first time to achieve positive growth.
But the most disturbing, than has been labeled as the world's largest hoist gantry crane market in China. Began in mid-2011 slowdown, allowing construction machinery enterprises instantly fell uneasy suspicions, whereas all the controversy surrounding the bottoming out and speculation, it has yet conclusive.

In addition, the judge also has a European economic uncertainty. In 2008, the global financial crisis, but then the  bridge gantry crane  industry rely on the government, "four trillion" stimulus policies implemented in 2009 more than 30% growth. The industry slump has lasted more than a year, based on past experience, from 2013 to 2014, or to see the national macro-control effects of the show. But the end result will depend on favorable and unfavorable factors superimposed. Favorable factors, the industry will be a 10% increase; many unfavorable factors, the industry may be negative growth.

Crane industry related specifications

In order to eliminate hidden dangers, construction quality and safety supervision station specifically for city construction  overhead bridge crane  operations management developed ten "red line", builders beyond any one of them, will face severe punishment, in serious cases, they will be hung booked even withheld safety production license.
It is reported that the supervisory authority will take the spot test method, the inspection found that the construction  sino hoist  management responsibilities are not implemented, there are security risks units and persons responsible for strict accountability, as appropriate, to give warning, hanging yellow card, remember bad behavior, withheld safety production license (or into fertilizer record card) and other penalties. Meanwhile, the city construction quality supervision station developed a "construction crane Ten Management 'red line'", focusing on the legal formalities to fulfill equipment operator certificates, safety limit safety device intact, implement regular inspection and maintenance as made it clear that.

    Please  steel crane  industry related personnel comply with relevant regulations!