Overhead cranes, also known as bridge cranes is one type of material handling equipment to meet the lifting requirements of medium and heavy industries. Generally, an overhead crane is a crane with a lifting hoist traveling along the cane bridge between parallel runways.
Overhead crane video
DQCRANES can provide basic standard cranes and customized overhead crane services. Our overhead cranes has a wide range of products, including LDP Low Headroom Single Girder Overhead Crane with lifting capacity up to 32 tons, QDY Ladle Overhead Crane up to 74 tons, LX Single Girder Suspension overhead Crane up to 10 tons, LH Double Girder Electric Hoist Crane up to 63 tons, QB Explosion Proof Bridge Crane up to 75 tons, LB Explosion-proof Single Girder Overhead Crane up to 20 tons, QC Electromagnetic Overhead Crane up to 32 tons, LD Single Girder Electric Hoist Crane up to 32 tons, QD Overhead Crane With Hook up to 550 tons, QZ Grab Bucket Overhead Crane up to 25 tons, QY Insulation Overhead Crane up to 50 tons, and QE Double Trolley Overhead Crane up to 400 tons.
Single girder overhead crane solves your material handling problem with single shot. Dongqi single girder overhead crane for sale good quality and price. Dongqi offers FEM underslung single girder overhead crane, Explosion proof single girder overhead crane, Electric hoist single girder overhead crane, Low Headroom single girder overhead crane, , Suspension single girder overhead crane for sale, etc.
They are designed for low height plant and factory, where the lifting room is limited but lifting height is high. The lifting capacity of the overhead crane is 1 to 32 tons whereas the lifting height is 6~20m.
The overhead crane is a small light lifting equipment, with the lifting capacity range from 1 to 10 tons, equipped with dual-speed electric hoist, which is widely used in the factory, warehouse, stockyard, etc.
Double girder overhead crane for sale: Up to 550 ton double girder overhead crane for sale good price. Types of double girder overhead cranes are available, such as, hook overhead crane, gab bucket overhead crane, electromagnetic overhead crane, soaking pit overhead crane, etc. Contact us to get your double girder overhead crane now.
The grab bucket overhead crane has the lifting capacity around 5 to 25 tons together with the weight of the grab bucket, which is widely used in power station, storage, workshop, and port to load and unload scattered objects.
The hook overhead crane can be used to lift loads from 5 tons to 550 tons, which is widely used to upload and move of normal weight in the fixed crossing space and also can work with various special-purpose hoist in special operations.
The overhead crane is used in metallurgy factory or outdoor place to load and transport electromagnetic black metal materials, such as , steel ingot, merchant steel and pig iron, etc. The lift capacity is from 5 to 32 tons.
The crane can lift loads from 5 to 63 ton, which is widely used in machinery fabrication, metallurgical plant auxiliary workshop, storage, stock ground, and power station, textile industry and food industry.
Main types of overhead cranes are as, single girder overhead crane, double girder overhead crane, top running overhead crane, under hung overhead crane, which can be customized according the required crane lifting capacity, working application, loading duty, and the other specific requirements.
Main overhead crane designs
Dongqi Hoist and Crane is able to provide your types of overhead crane according to your requirements and application conditions.Please click the overhead crane pictures to get the overhead crane specifications or contact us to get your ideal material handling solutions.
Single girder crane
Double girder crane
Top running crane
Remote control crane
Under hung crane
Single girder overhead cranes
FEM underslung overhead crane
Explosion proof single girder overhead crane
Electric hoist single girder overhead crane
Low Headroom single girder overhead crane
Single girder overhead crane European style for sale
Suspension single girderoverhead crane
Double girder overhead crane offering
Explosion proof overhead crane
Double girder overhead crane
Double trolley overhead crane
Electrolytic aluminum overhead crane
FEM overhead crane
Grab bucket overhead crane
Insulation overhead crane
Ladle overhead crane
Electromagnetic overhead crane
Overhead cranes by application environment
Indoor overhead crane for sale
Industrial overhead crane for sale
Material handling overhead crane for sale
Magnetic overhead crane for sale
Shop overhead crane for sale
Warehouse overhead crane for sale
Workstation overhead crane for sale
Garage overhead crane for sale
KBK light crane system for sale
Lifting capacity offering of Dongqi Hoist and crane for sale
1 ton overhead crane for sale
2 ton overhead crane for sale
3 ton overhead crane for sale
5 ton overhead crane for sale
6 ton overhead crane for sale
7 ton overhead crane for sale
7.5 ton overhead crane for sale
8 ton overhead crane for sale
10 ton overhead crane for sale
12 ton overhead crane for sale
15 ton overhead crane for sale
20 ton overhead crane for sale
25 ton overhead crane for sale
30 ton overhead crane for sale
35 ton overhead crane for sale
40 ton overhead crane for sale
50 ton overhead crane for sale
60 ton overhead crane for sale
70 ton overhead crane for sale
75 ton overhead crane for sale
80 ton overhead crane for sale
90 ton overhead crane for sale
100 ton overhead crane for sale
Get your custom overhead crane
Overhead crane case study of Dongqi Hoist and Crane
Overhead Crane Frequently Asked Questions and Answers
Question 1: Why does Dongqi Crane use PLC on overhead crane?
Answer: PLC is the abbreviation of programmable logic controller. Its basic structure are composed of power, CPU, memory, input/output interface circuit, function module and communication module. PLC can change the form of relay-contacts control, and can make it adjustable for electric motors' speed of every file, acceleration time and braking time according to practical conditions. PLC functions include calculating, controlling, programming, communicating, diagnosing, processing. Because PLC has various advantages and can make heavy duty overhead cranes more safety and convenient, Dongqi Enterprise apply PLC in overhead crane system. Its advantages are following. 1. Convenient use, simple program 2. Strong function, highly cost-effective 3. Complete hardware, convenient use for customers, strong adaptability 4. High reliability, strong anti-interference capability 5. Little work for system's design, installation and test 6. Little work for maintenance and convenient maintenance.
Question 2: What's the system of hoist overhead crane?
Answer: Electric hoist overhead crane mainly includes lifting mechanism, travelling mechanism (trolley travelling mechanism and overhead crane travelling mechanism) and rotating mechanism. First is lifting mechanism, it refers to electric hoist. It is composed of driving device (electric motor), braking device (brake), transmission device (reducer) and fetching rotating device (hook, grab, magnetic disc, and wire rope, chain, trolley, drum, sprocket and rope-guiding device). Second is horizontal travelling mechanism, it is trolley travelling mechanism. Travelling trolley is composed of electric motor, braking device (brake), transmission device (reducer) and trolley wheel device. Third is vertical travelling mechanism, it is overhead crane travelling mechanism. This mechanism includes driving mechanism (electric motor), braking device (brake), and transmission device (reducer) and overhead crane wheel device. The advantage of electric hoist overhead crane is that it adopts three-in-one driving device. It combines driving device (electric motor), braking device (brake) and transmission device (reducer) together. It is a compact and light driving device without shaft.
Question 3 : How do bridge overhead cranes supply power ?
Answer: First is through flexible cable. The power of the lifting overhead crane is supplied by AC power system. Because the work of the overhead cranes is movable, the overhead crane and the power can't be connected in fixed way. In general, the flexible cable is used to supply the power. When the overhead crane system and the trolley move on the tack, flexible cable can stretch and roll along the track. Second is through slide wire and electric brush. Three phase AC power is transported into cabin's protection box through three main slide wires and electric brush, then transported to overhead crane system's motor, electromagnet and AC control station through wire way. Third is through auxiliary slide wire and electric brush. This refers to the power supply of magnetic brake, trolley's hoisting mechanism and trolley's motor.
Question 4 : What to do when the overhead crane trolley line is out of power ?
Answer: The reason is that electric brush climbs in the conductor, the brush wears seriously, conductor joint is not smooth, single connector is used, rail joint becomes loose. The correct way is to check whether the brush wears seriously, change electric brush, adjust the connecting joint, and adopt double-brush connector.
Question 5: What to do when the guiding rail is deformation, the collector doesn't work?
Answer: The main reason is the temperature is too high, the distance between lifting racks is too long or loose. It is useful to adopt anti-heat plate partially, add sun shield outdoors, increase the number of trolley line lifting racks, correct the conductor and screw down the screws.
Question6 : What to do when the overhead crane trolley line shakes seriously?
Answer: The reason is that fork can't absorb the transmission error, guiding-rail has poor straightness, and lifting rack is loose. The right way is to modify tractor, adjust the straightness of guiding-rail, and tighten the screw mounts.
Question7: What are the factors which influences overhead crane working speed?
Answer: Overhead crane working speed includes lifting speed, trolley travelling speed, overhead crane travelling speed. Working speed is influenced by many factors.
First, it is related to the weight. The overhead crane with small and medium lifting can adopt high speed to improve efficiency, the overhead crane with heavy lifting is suitable to choose low speed to reduce driving-power and improve travelling stability and safety.
Working speed is also related to working class and working requirement. The overhead crane with high class, frequent use and high efficiency can adopt fast speed, working mechanism with low class and adjusting purpose can adopt low speed. The overhead crane only used for equipment installation and maintenance can choose low speed.
According to practical needs, it can also adopt double speed (high and low speed), dead speed or adjustable speed. What's more, working speed is also related to working room. The overhead crane with long travelling distance, high lifting height is suitable for high speed. The overhead crane with short travelling distance is not suitable for high speed. With development of industry, the overhead crane with much transporting work mostly adopts high speed.
The overhead crane used for installation and maintenance adopts adjustable speed. For some overhead cranes with special functions, such as the overhead crane for quench, should has fast-down device, for overhead crane with high lifting height, it should improve lifting speed, adopt low speed for heavy material, high speed for no-load, or high down-speed to increase efficiency.
Question 8: What to do when the brake can't stop the braking-wheel?
Answer: The reasons are as following: the leverage hinge is stuck, braking-wheel and friction plate have oil pollution, electromagnetic core doesn't have enough travelling distance, braking-wheel and friction wheel are wearied seriously, main spring is loose and damaged, locking-nut and tie rod are loose. Make lubrication and exclude stuck fault, clean the oil pollution, adjust the brake, change the friction plate, change the main spring and locking-nut, tight the locking-nut, check the impeller driving mechanism.
Question9: What to do when the brake is too hot, the friction plate wears fast.
Answer: The braking-shoe is loose, it doesn't break off the braking-wheel totally, and causes friction. The gap between two braking-shoe and braking-wheel is not even, or the gap is too narrow. The assistant-spring of short distance brake damages or bends, the braking-wheel surface is very tough. What to do is to adjust the gap, change or maintain the assistant-spring, processes the braking-wheel surface. The reducer has uneven tapping and the machine cover vibrates when the reducer and gears mesh. Just change the gears.
Question10: Why overhead crane system need buffers?
Answer: Three kinds of buffers are used widely, spring buffer, rubber buffer and hydraulic buffer. Spring buffer is reliable and convenient to maintain. Rubber buffer has simple structure. Hydraulic buffer can absorb large hitting energy and has no rebound effect. When limiting stopper of travelling extreme position or brake is in trouble, due to the inertia, the overhead crane system moving in the end or the trolley on the main girder, will hit against the stopper set in the position. But overhead crane buffer can absorb the travelling energy of overhead crane system or trolley and reduce impulsion. Buffers should be set between the bridge overhead cranestravelling on the same track, or between the double trolleys on the same girder.
Question11: What is the anti-collision device on overhead cranes?
Answer: It mainly includes laser type, ultrasonic type, infrared type, electromagnetic type, all use the principle that light or radio wave travels, reflects and the distance can be measured. When two overhead cranes travels to pointed position, the overhead crane mechanism rings alarm bell and gives the stop command at the same time.
Question12: How does anti-deflection device protect overhead cranes?
It includes wire-rope type, cam type, chain wheel type and skew indicator and other automatic adjustable devices. When the bridge frame deflects to some degree, it can give signal to the operator and adjust itself automatically. When the overhead crane frame deflects seriously, it can cut the power automatically, stop the travelling mechanism and protect the safety.
Question13: What is the function of safety hook of overhead crane?
Answer: Safe hook is an important part of bridge overhead crane. What are functions and types of safe hook?
Safety hook is mainly used for single girder overhead crane. Lifting material at one side of main girder, the material has a tilting torque against trolley, anti-tilting torque from vertical gauge wheel or horizontal gauge wheel can keep the trolley balance. But this kind of way can't ensure the safety under the condition of cyclone, outside impact, wheel broken, maintenance and repair. Thus this overhead crane should be installed with safe hook. According to trolley and wheel, safe hook has different structures.
Question14: How to inspect the safe hook of overhead crane?
Answer: The inspection of the overhead crane safe hook is necessary. When the trolley travels along the main girder, there is no stuck between safe hook and rail or main girder web. Web has no weariness. The gap between safe hook and rail should meet the design requirement. Bolt is tight and on the right location, weld is seal, safe hook has no damage, such as abnormal deformed. Function check is the basic method, just through visual inspection and test operation.
Question15: how to lubricate the large and heavy overhead crane?
Answer: Lubrication is necessary for large overhead crane. Reasons to lubricate your overhead crane It can control friction, reduce weariness, down overhead crane temperature, avoid rust and form seal. These functions rely on each other and influence each other. If the friction can't be controlled, the weariness can/t be reduced, this will lead much friction heat and items high temperature, thus to damage the friction surface lubrication and lubricating material. How to lubricate your overhead crane?
ome parts should be lubricated regularly, such as shafts, holes and friction surface with relative move. Due to different working condition, the lubricating points are different. For various kinds of overhead cranes and different lubricating parts, every lubrication should meet the standards and requirement of instructions. It is good for overhead crane to make regular lubrication and check. Lubricating with qualified oil can ensure the overhead crane work normally and avoid early weariness. Bad oil can lead mechanical accident, even damages equipment, influences safe producing. Lubrication plays an important role in overhead crane's maintenance. The lubricating oil can influence the effect directly.
Question 16:How to select overhead crane for your application?
Answer:Overhead crane or bridge crane is used to improve your working efficiency of your factory and warehouse. How to select the most suitable overhead crane for your application? Here are some questions for you to select your overhead crane:
How long has the manufacture or provider of the overhead crane been in business?
Do they have direct industry experience in providing overhead cranes for competitors?
What types of overhead cranes they can offer?
What’s their overhead crane manufacturing procedures and quality control process?
Are their overhead crane ISO certificated? See our overhead crane certifications.
How often your overhead crane will be used, once a week, once or twice a day, or constantly?
How will the overhead crane move? (Up or down, left or right, forward or back?)
Question 17: Why to choose Dongiq overhead crane?
Answer: In order to win the international overhead crane market, DQCRANES exceeds itself in providing superior quapty overhead cranes and overhead crane services. DQCRANES is dedicated itself to win the smiles of you, our valuable customers around the world through its effort in the following aspects:
1. Customized overhead crane perfectly fits your apppcation environment.
Taking your building and working conditions and your pfting requirements into full consideration, the engineering team of DQCRANES will work out an overhead crane which will adapt your facipty ideally.
2. Types of quapty overhead cranes with various tonnages are available which can meet your pfting requirements.
Hot designs of Dongqi overhead crane
Double girder overhead crane, Single girder overhead crane, suspension overhead crane,
Manual suspension overhead crane, manual overhead crane, etc. Most popular overhead crane tonnages
1 ton overhead crane, 2 ton overhead crane, 3 ton overhead crane, 5 ton overhead crane, 10 ton overhead crane, 20 ton overhead crane, 30 ton overhead crane
3. pfetime care is given to your overhead crane to maximize your overhead crane value.
DQCRANES cares your overhead crane through the whole working pfe and we provide overall crane services for your overhead crane safety. Dongqi overhead crane service includes: Overhead crane design, overhead crane installation, overhead crane operator training, overhead crane inspection,etc.
4. Competitive overhead crane price is the unbeatable advantage of DQCRANES.
DQCRANES can provide overall services for all types of industries overhead cranes, and the main services are as follow:
Overhead crane project design
Overhead cranes designed by DQCRANES will solve any of your overhead crane problems and material handling problems without spending any unnecessary expenditures.
Overhead crane Installation
EASAY installation, wonderful working performance. DQCRANES can provide on-site overhead crane installation services and our crane engineers will be at your services when necessary.
Lifetime maintenancefor your overhead cranes
Overhead crane maintenance from DQCRANES ensures your crane safety and working efficiency.
Overhead crane operator training
DQCRANES training includes overhead crane operation, maintenance and inspection, and crane spare parts, etc.
The powerful technical support of DQCRANES will solve your overhead crane technical problems.
Overhead crane parts
Dongqi overhead crane parts will renew your cranes.