Crane Maintenance

electric hoist manufacturers 1), the appearance of the bridge crane: a comprehensive clean appearance, so that no dust, no yellow robe. Check for cracks, open welding.
2), carts, trolley: ① Check and tighten the drive shaft housing, gearbox, coupling and shaft, the key is loose; ② Check and adjust brake wheel clearance to make it uniform, sensitive and reliable.
3) Check the overhead crane reducer mainly to see if the oil spill. Cabinets abnormal sound operation, it is necessary to open the lid to check. Usually bearing damage or gear backlash is too large, severe tooth wear and other reasons.
4), lifting winch: ① Check the wire rope, hook, pulley is safe and reliable, wear exceeds the specified value should be replaced. ② Check and adjust the brakes, make it safe, sensitive and reliable.
5), overhead crane wire rope inspection. Inspection should focus on observation broken wire rope wear, kinks, rust, etc., for some wear, broken wires more serious position but not excessive, do the mark to focus on tracking the retest. Pay attention to check the safety rope in the roll stopper is valid, whether the rope reel clamping plate and plate number is appropriate.
6) Lubrication: Check all parts of the oil, fuel, as required to join or replace oil.jib crane manufacturers

7) Check for overhead crane pulley. Focus on the bottom is excessive wear of cast iron pulleys and whether there are cracks. For the balance wheel pulley block overlooking Young organization, because usually the case it does not move, it is easily overlooked. So, be sure to check before installing the flexibility of its rotation, otherwise, the installation of wire rope around Jan overlooking length and tension can not be used to automatically adjust the balance wheel, so that an increase in altitude adjustment rope Young overlooking the difficulty and risk level jobs.
8) Electrical: ① check the limit switch is sensitive and reliable; ③ check the electrical box is sensitive and reliable operation of all electrical appliances; ③ Check the motor, bells, lead is safe and reliable; ④ check signal is good.
9) Check for loose coupling each bridge crane or even "scroll keys." Focus on checking the flexible pin coupling elastic rubber ring without abnormal wear of tooth couplings to pay special attention to the ring gear wear. Due to installation accuracy, between the two axes at a greater offset, the performance of the entire ring in a short time will soon be bald. If such a situation, prone to serious accidents in the lifting mechanism.

Note crane

electric winch manufacturers(1) Each crane nominal weight must hang signs in conspicuous places.
(2) work, it was not allowed to transport people or hook on the bridge.
(3) No operating permits and drink are not allowed to drive a crane.
(4) the operation must concentrate, not allowed to talk, smoking or doing things unrelated.
(5) To clean the car; allowed misplacing equipment, tools, flammable, explosive materials and dangerous goods.
(6) the use of a crane is not allowed supercharged.
(7) The following are not allowed lifting: bundling is not strong; mechanical overload; signal is unknown; stayed; buried or frozen objects in the ground; it was on was hanging objects; no security measures flammable, explosive devices and dangerous goods; overfilled liquid items; rope does not meet safety requirements; lifting mechanism is faulty.
(8) Crane runs on the line when there is no obstacle, hook or hanger and hanging objects underside, must more than 2m from the ground. If you cross the barrier, should be more than 0.5m tall obstructions.metallurgical electric hoist
(9) for lifting the weight of less than 50% of rated items, allowing simultaneous operation of both institutions; hanging from the weight of more than 50% of the rated items, only can an agency action.
(10) has a main and auxiliary hook bridge crane, do not increase or decrease the main and auxiliary hook (special exception) at the same time.
(11) allowed or hammering and welding work on the object to be lifted the following items (if you can support).
(12) must be after a power outage and when power switches wears a sign the job before inspection or repair work done. If you must live operations, there must be security measures to protect and have someone care.
(13) can not just throw things down from the car.

(14) limit switches and interlock protection device should always check.
(15) not allowed to touch the limit switch as a parking solution.
When there is a problem (16) lift brakes, lifting weights is not allowed.
(17) was hanging objects are not allowed to run in person or over the equipment.
(18) when the crane unit of welding, to specifically set the ground, do not allow the use of body ground.
(19) The hook is in the lower limit position, must retain more turns on the reel safety ropes.
(20) does not allow the crane bumped, but does not allow the use of a crane to promote another crane to work.
(21) lifting heavy objects, liquid metal, when explosive and dangerous goods must be slowly lifted from the ground 100 ~ 200mm, brake test reliability.
(22) Repair and examination lights, the voltage must be less than 36V.
(23) All electrical equipment overhead crane enclosure should be grounded. Such as trolley track is not in the main beam welding, welding ground measures should be taken. Grounding line can be greater than the cross-sectional area of 75mm2 bare copper or galvanized flat iron or greater than 30mm2 10mm2 galvanized round. Ground position or crane cab body should be more than two. Ground resistance to any point on the power neutral between crane shall be less than 4Ω.
(24) to have regular check security technology, good pre preparatory work.

Crane inspection items

electromagnetic overhead craneOverhead crane safety inspection in order to ensure safe operation of the overhead crane, crane operation required during some routine security check on the project and highlights are as follows:
(1) lifting height limiter, travel limit switch and all the positive properties of interlocking institutions
(2) comply with the safety requirements of the major components: the opening is increased less than 15% of the original size, the torsional deformation of less than 10%; hook bushing wear plate is less than 50% of the original size, the mandrel plate hook wear less than 5%, no peeling burr, welding. Hanger hook and pulley no obvious defects. The surface of the wire rope wear, corrosion is less than 40% of the diameter of the wire, broken wires in one lay length within less than 10% of the total number of wires, no breaks, no thinning, no core prolapse, dead twisting, compressional deformation annealing, burning phenomenon.electric hoist manufacturers

End connections and fixed rope clips, clips, wedge block connection intact, no loose plate at least two, the number of no less than three catches. Roll no cracks, connections, fixed no loose; cylinder wall wear less than 20% of the original wall thickness; secure volume of not less than two laps, reel and rope diameter ratio of compliance. Balance wheel fixed intact, shall comply with the requirements of the rope. Brakes no cracks, no loose, no serious wear, brake clearance on both sides equal right size, there is sufficient braking force, brake wear with less than 50% of the original thickness.
By conventional overhead crane safety inspection, to prevent accidents, reduce equipment accidents, improve equipment operation rate and reduce maintenance costs etc play a significant role.

Market situation crane

"Guidance Catalogue (2011 version) industrial restructuring," the National Development and Reform Commission promulgated clear that more than 400-ton crawler crane and was elected as a new industry, "encouraged" products, crawler cranes prospects.
Three quarters of 2011, China's heavy truck industry sales of 712,000 total. Heavy-duty truck market is entering a downward phase:
First, the industry increasingly stringent policies, regulations promulgated by the state a lot of safety, environmental protection, energy conservation, etc., while the implementation of more stringent aspects of the trend. Formulation and execution of these regulations increase, will result in the heavy truck industry product technology requirements increase, while production costs will be further improved.metallurgical electric hoist

Second, the market is increasingly competitive. Our truck market has been faced with global competition, although China's heavy truck industry, the market share of domestic brands accounted for the vast proportion, but this does not represent the future pattern will remain, product technology to improve the localization of manufacturing costs and other factors, in the heavy truck industry make future changes in the competitive environment.
With the continuous development of the crane industry, more and more companies were added to the crane industry in the past. High full noted that risk of construction machinery, including technical risks, supply and demand and other economic risks and the risk of fluctuations. Current engineering machinery part of the product's core technology is mainly reflected in the overall design and technology integration, if companies can not timely research and development of new technologies, new processes and new products to meet market requirements, the product may be at risk of being eliminated.
Because of China's construction machinery industry is extremely competitive, especially international construction machinery giant inroads into the Chinese market. Compared with foreign competitors, China's enterprises in terms of product range, research and development, technology, capital size and brand influence, etc. There is a big gap. In addition, fluctuations in the world economy has or will bring some uncontrollable risk in the industry. Engineering machinery industry investment in infrastructure projects as industry-driven, if future economic growth rate slowed down, down the scale of investment in fixed assets

Crane Maintenance

Crane maintenance necessarygantry crane manufacturers
Care and maintenance of good not only directly related to the safe use of machinery and cranes, crane machinery and equipment also decide whether to maintain the vitality and extend the life of the follow-up to create more economic benefits. Crane in long-term use, a number of components and connections are due to vibration, friction and other factors inevitably loose, corrosion, aging, damage and so on. In order to extend the life of the crane, reduce equipment failure rates, reduce and eliminate security risks, regular maintenance of equipment for the crane to do the maintenance work is very necessary and very important. Only regular checks, maintenance and repair crane, its parts need lubrication for lubrication, make a firm needs to tighten its parts, maintenance, and replacement parts for its vulnerability to promptly eliminate hidden faults equipment, reduce accident incidence, making safer crane operation, in order to create a better economic benefits.explosion proof electric hoist
As the use of a crane unit, in addition to strict compliance with the requirements of the operator

Off the technical specifications and special equipment safety procedures, but also attaches great importance to its care and maintenance, at the same time create economic benefits for the production of equipment, but also put some money into the maintenance and repair work to go crane equipment, regular maintenance timely maintenance, to better ensure that the equipment and personal safety.
Regular maintenance content
Hydraulic system state detection, replacement of wear, deformation, cracks, corrosion parts, electrical control systems, check feeders, controllers, overload protection, safety protection device is reliable. Caused by mechanical crane test run to check the leak, pressure, temperature, vibration, noise and other reasons failure symptoms. After observing the structure of the crane, bearing, transmission parts of the state of subjective testing, understand the state of the art crane machine, check to make sure the fault source anomalies. The driver is responsible for the routine maintenance project work, the main content is clean, lubricate transmission parts, adjusting and tightening job. By running the test the reliability of safety devices sensitive listener running any abnormal sounds

Types of cranes

electric winch manufacturers Widely used in lifting handling machinery, cranes usefulness port, workshops, construction sites and other places in and lifting equipment, rescue, lifting, machinery, rescue
Crane species: A. Removable: truck crane, crawler cranes, hoists and other lines. B. Fixed: dock cranes, tower cranes, gantry cranes, etc. The name of the crane is a unified title. Commonly referred to as multi-finger crane truck crane, crawler cranes, RTG.
Security Guide
1, overloading or weight lifting is not hanging unclear;
2, the command signal is not clear is not hanging;
3, tied up, hanging is not strong or unbalanced, may cause slippage not hanging;
4 When not hanging, hanging objects floating on someone or glove;
5, structure or component defects affecting safety or when damage is not hanging;
6. In case of pulling clear of embedded objects do not hang;
7, workplace dark, unable to see the venue, time is not hanging hanging objects and traffic signals;
8, was among hanging objects at the edges and not padded when bundled wires do not hang;
9, crooked pulled oblique lifting weights when not hanging;
10, crane safety device incomplete, unreliable, and so do not hang.
There are high-voltage areas not work.
12. Cloudy windy rain does not work
Truck cranemetallurgical electric hoist
Truck crane known as the crane,
The concept car is the car hoists and cranes combined can not assemble itself in the form of direct work.
The advantage is convenient and flexible, high efficiency, fast transitions, improve work efficiency.
The disadvantage is that the terrain, large equipment (1000-2000 tonnes) can not be completed. (Maximum tonnage of 3200 tons truck crane.)
Crawler

Crawler cranes are referred to, is an off site is crawler, by crawler cranes.
The advantage is lifting large, heavy lifting can walk. Has strong lifting capacity.
The disadvantage is that disassembly of trouble, the boom can not be freely scalable, limitations too. Suitable large factories, working in the factory area. Crawler Pictures
RTG
RTG is the use of tire rotation chassis walking boom crane. RTG is the lifting mechanism is mounted on a special type of tire and wheel heavier chassis consisting of a whole slew cranes, its upper structure is basically the same with the crawler crane. Truck crane is lifting a tire. RTG picture
The advantage is the body short, mobile and flexible operation, high efficiency.
The disadvantage is that the terrain, large equipment can not be completed

Crane origin

explosion proof electric hoist Cranes are commonly known as crane, crane (Crane) is a kind of lifting machinery, is a for loop, intermittent motion machine. A work cycle comprising: extract means to extract from the articles lifted, and then moved horizontally to the appointed place down the article, followed by reverse movement, so that the extract means to return the home position for the next cycle. Such as fixed-slewing cranes, tower cranes, truck cranes, tires, crawler cranes.
Within a certain range of vertical lifting and carrying heavy loads of multi-level action lifting machinery. Also known as the crane. Are material handling machinery. Crane's work is characterized by intermittent exercise to do that in a work cycle reclaimer, transport, unloading and other movements of the appropriate agency is working alternately. Crane
electromagnetic overhead craneCrane prototype
Chinese ancient irrigated farmland is used orange jib cranes prototype.
The 14th century, Western Europe and the emergence of the human animal driven rotating jib cranes.

The early 19th century, there has been a bridge crane; Crane important wear parts such as shafts, gears and spreader began to use metal materials, and began to use hydraulic drives.
Late 19th century, steam-driven crane gradually replaced the water-driven crane.
Beginning in the 1920s, due to the rapid development of the electrical industry and internal combustion industry to motor or internal combustion engine for a variety of crane power plant is basically formed. Crane